2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/kernel.h>
20 #include <linux/bio.h>
21 #include <linux/buffer_head.h>
22 #include <linux/file.h>
24 #include <linux/pagemap.h>
25 #include <linux/highmem.h>
26 #include <linux/time.h>
27 #include <linux/init.h>
28 #include <linux/string.h>
29 #include <linux/backing-dev.h>
30 #include <linux/mpage.h>
31 #include <linux/swap.h>
32 #include <linux/writeback.h>
33 #include <linux/statfs.h>
34 #include <linux/compat.h>
35 #include <linux/bit_spinlock.h>
36 #include <linux/xattr.h>
37 #include <linux/posix_acl.h>
38 #include <linux/falloc.h>
39 #include <linux/slab.h>
40 #include <linux/ratelimit.h>
41 #include <linux/mount.h>
42 #include <linux/btrfs.h>
43 #include <linux/blkdev.h>
44 #include <linux/posix_acl_xattr.h>
45 #include <linux/uio.h>
48 #include "transaction.h"
49 #include "btrfs_inode.h"
50 #include "print-tree.h"
51 #include "ordered-data.h"
55 #include "compression.h"
57 #include "free-space-cache.h"
58 #include "inode-map.h"
64 struct btrfs_iget_args {
65 struct btrfs_key *location;
66 struct btrfs_root *root;
69 static const struct inode_operations btrfs_dir_inode_operations;
70 static const struct inode_operations btrfs_symlink_inode_operations;
71 static const struct inode_operations btrfs_dir_ro_inode_operations;
72 static const struct inode_operations btrfs_special_inode_operations;
73 static const struct inode_operations btrfs_file_inode_operations;
74 static const struct address_space_operations btrfs_aops;
75 static const struct address_space_operations btrfs_symlink_aops;
76 static const struct file_operations btrfs_dir_file_operations;
77 static struct extent_io_ops btrfs_extent_io_ops;
79 static struct kmem_cache *btrfs_inode_cachep;
80 static struct kmem_cache *btrfs_delalloc_work_cachep;
81 struct kmem_cache *btrfs_trans_handle_cachep;
82 struct kmem_cache *btrfs_transaction_cachep;
83 struct kmem_cache *btrfs_path_cachep;
84 struct kmem_cache *btrfs_free_space_cachep;
87 static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
88 [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
89 [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
90 [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
91 [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
92 [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
93 [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
94 [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
97 static int btrfs_setsize(struct inode *inode, struct iattr *attr);
98 static int btrfs_truncate(struct inode *inode);
99 static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent);
100 static noinline int cow_file_range(struct inode *inode,
101 struct page *locked_page,
102 u64 start, u64 end, int *page_started,
103 unsigned long *nr_written, int unlock);
104 static struct extent_map *create_pinned_em(struct inode *inode, u64 start,
105 u64 len, u64 orig_start,
106 u64 block_start, u64 block_len,
107 u64 orig_block_len, u64 ram_bytes,
110 static int btrfs_dirty_inode(struct inode *inode);
112 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
113 void btrfs_test_inode_set_ops(struct inode *inode)
115 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
119 static int btrfs_init_inode_security(struct btrfs_trans_handle *trans,
120 struct inode *inode, struct inode *dir,
121 const struct qstr *qstr)
125 err = btrfs_init_acl(trans, inode, dir);
127 err = btrfs_xattr_security_init(trans, inode, dir, qstr);
132 * this does all the hard work for inserting an inline extent into
133 * the btree. The caller should have done a btrfs_drop_extents so that
134 * no overlapping inline items exist in the btree
136 static int insert_inline_extent(struct btrfs_trans_handle *trans,
137 struct btrfs_path *path, int extent_inserted,
138 struct btrfs_root *root, struct inode *inode,
139 u64 start, size_t size, size_t compressed_size,
141 struct page **compressed_pages)
143 struct extent_buffer *leaf;
144 struct page *page = NULL;
147 struct btrfs_file_extent_item *ei;
150 size_t cur_size = size;
151 unsigned long offset;
153 if (compressed_size && compressed_pages)
154 cur_size = compressed_size;
156 inode_add_bytes(inode, size);
158 if (!extent_inserted) {
159 struct btrfs_key key;
162 key.objectid = btrfs_ino(inode);
164 key.type = BTRFS_EXTENT_DATA_KEY;
166 datasize = btrfs_file_extent_calc_inline_size(cur_size);
167 path->leave_spinning = 1;
168 ret = btrfs_insert_empty_item(trans, root, path, &key,
175 leaf = path->nodes[0];
176 ei = btrfs_item_ptr(leaf, path->slots[0],
177 struct btrfs_file_extent_item);
178 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
179 btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE);
180 btrfs_set_file_extent_encryption(leaf, ei, 0);
181 btrfs_set_file_extent_other_encoding(leaf, ei, 0);
182 btrfs_set_file_extent_ram_bytes(leaf, ei, size);
183 ptr = btrfs_file_extent_inline_start(ei);
185 if (compress_type != BTRFS_COMPRESS_NONE) {
188 while (compressed_size > 0) {
189 cpage = compressed_pages[i];
190 cur_size = min_t(unsigned long, compressed_size,
193 kaddr = kmap_atomic(cpage);
194 write_extent_buffer(leaf, kaddr, ptr, cur_size);
195 kunmap_atomic(kaddr);
199 compressed_size -= cur_size;
201 btrfs_set_file_extent_compression(leaf, ei,
204 page = find_get_page(inode->i_mapping,
205 start >> PAGE_CACHE_SHIFT);
206 btrfs_set_file_extent_compression(leaf, ei, 0);
207 kaddr = kmap_atomic(page);
208 offset = start & (PAGE_CACHE_SIZE - 1);
209 write_extent_buffer(leaf, kaddr + offset, ptr, size);
210 kunmap_atomic(kaddr);
211 page_cache_release(page);
213 btrfs_mark_buffer_dirty(leaf);
214 btrfs_release_path(path);
217 * we're an inline extent, so nobody can
218 * extend the file past i_size without locking
219 * a page we already have locked.
221 * We must do any isize and inode updates
222 * before we unlock the pages. Otherwise we
223 * could end up racing with unlink.
225 BTRFS_I(inode)->disk_i_size = inode->i_size;
226 ret = btrfs_update_inode(trans, root, inode);
235 * conditionally insert an inline extent into the file. This
236 * does the checks required to make sure the data is small enough
237 * to fit as an inline extent.
239 static noinline int cow_file_range_inline(struct btrfs_root *root,
240 struct inode *inode, u64 start,
241 u64 end, size_t compressed_size,
243 struct page **compressed_pages)
245 struct btrfs_trans_handle *trans;
246 u64 isize = i_size_read(inode);
247 u64 actual_end = min(end + 1, isize);
248 u64 inline_len = actual_end - start;
249 u64 aligned_end = ALIGN(end, root->sectorsize);
250 u64 data_len = inline_len;
252 struct btrfs_path *path;
253 int extent_inserted = 0;
254 u32 extent_item_size;
257 data_len = compressed_size;
260 actual_end > PAGE_CACHE_SIZE ||
261 data_len > BTRFS_MAX_INLINE_DATA_SIZE(root) ||
263 (actual_end & (root->sectorsize - 1)) == 0) ||
265 data_len > root->fs_info->max_inline) {
269 path = btrfs_alloc_path();
273 trans = btrfs_join_transaction(root);
275 btrfs_free_path(path);
276 return PTR_ERR(trans);
278 trans->block_rsv = &root->fs_info->delalloc_block_rsv;
280 if (compressed_size && compressed_pages)
281 extent_item_size = btrfs_file_extent_calc_inline_size(
284 extent_item_size = btrfs_file_extent_calc_inline_size(
287 ret = __btrfs_drop_extents(trans, root, inode, path,
288 start, aligned_end, NULL,
289 1, 1, extent_item_size, &extent_inserted);
291 btrfs_abort_transaction(trans, root, ret);
295 if (isize > actual_end)
296 inline_len = min_t(u64, isize, actual_end);
297 ret = insert_inline_extent(trans, path, extent_inserted,
299 inline_len, compressed_size,
300 compress_type, compressed_pages);
301 if (ret && ret != -ENOSPC) {
302 btrfs_abort_transaction(trans, root, ret);
304 } else if (ret == -ENOSPC) {
309 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags);
310 btrfs_delalloc_release_metadata(inode, end + 1 - start);
311 btrfs_drop_extent_cache(inode, start, aligned_end - 1, 0);
314 * Don't forget to free the reserved space, as for inlined extent
315 * it won't count as data extent, free them directly here.
316 * And at reserve time, it's always aligned to page size, so
317 * just free one page here.
319 btrfs_qgroup_free_data(inode, 0, PAGE_CACHE_SIZE);
320 btrfs_free_path(path);
321 btrfs_end_transaction(trans, root);
325 struct async_extent {
330 unsigned long nr_pages;
332 struct list_head list;
337 struct btrfs_root *root;
338 struct page *locked_page;
341 struct list_head extents;
342 struct btrfs_work work;
345 static noinline int add_async_extent(struct async_cow *cow,
346 u64 start, u64 ram_size,
349 unsigned long nr_pages,
352 struct async_extent *async_extent;
354 async_extent = kmalloc(sizeof(*async_extent), GFP_NOFS);
355 BUG_ON(!async_extent); /* -ENOMEM */
356 async_extent->start = start;
357 async_extent->ram_size = ram_size;
358 async_extent->compressed_size = compressed_size;
359 async_extent->pages = pages;
360 async_extent->nr_pages = nr_pages;
361 async_extent->compress_type = compress_type;
362 list_add_tail(&async_extent->list, &cow->extents);
366 static inline int inode_need_compress(struct inode *inode)
368 struct btrfs_root *root = BTRFS_I(inode)->root;
371 if (btrfs_test_opt(root, FORCE_COMPRESS))
373 /* bad compression ratios */
374 if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS)
376 if (btrfs_test_opt(root, COMPRESS) ||
377 BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS ||
378 BTRFS_I(inode)->force_compress)
384 * we create compressed extents in two phases. The first
385 * phase compresses a range of pages that have already been
386 * locked (both pages and state bits are locked).
388 * This is done inside an ordered work queue, and the compression
389 * is spread across many cpus. The actual IO submission is step
390 * two, and the ordered work queue takes care of making sure that
391 * happens in the same order things were put onto the queue by
392 * writepages and friends.
394 * If this code finds it can't get good compression, it puts an
395 * entry onto the work queue to write the uncompressed bytes. This
396 * makes sure that both compressed inodes and uncompressed inodes
397 * are written in the same order that the flusher thread sent them
400 static noinline void compress_file_range(struct inode *inode,
401 struct page *locked_page,
403 struct async_cow *async_cow,
406 struct btrfs_root *root = BTRFS_I(inode)->root;
408 u64 blocksize = root->sectorsize;
410 u64 isize = i_size_read(inode);
412 struct page **pages = NULL;
413 unsigned long nr_pages;
414 unsigned long nr_pages_ret = 0;
415 unsigned long total_compressed = 0;
416 unsigned long total_in = 0;
417 unsigned long max_compressed = 128 * 1024;
418 unsigned long max_uncompressed = 128 * 1024;
421 int compress_type = root->fs_info->compress_type;
424 /* if this is a small write inside eof, kick off a defrag */
425 if ((end - start + 1) < 16 * 1024 &&
426 (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size))
427 btrfs_add_inode_defrag(NULL, inode);
429 actual_end = min_t(u64, isize, end + 1);
432 nr_pages = (end >> PAGE_CACHE_SHIFT) - (start >> PAGE_CACHE_SHIFT) + 1;
433 nr_pages = min(nr_pages, (128 * 1024UL) / PAGE_CACHE_SIZE);
436 * we don't want to send crud past the end of i_size through
437 * compression, that's just a waste of CPU time. So, if the
438 * end of the file is before the start of our current
439 * requested range of bytes, we bail out to the uncompressed
440 * cleanup code that can deal with all of this.
442 * It isn't really the fastest way to fix things, but this is a
443 * very uncommon corner.
445 if (actual_end <= start)
446 goto cleanup_and_bail_uncompressed;
448 total_compressed = actual_end - start;
451 * skip compression for a small file range(<=blocksize) that
452 * isn't an inline extent, since it dosen't save disk space at all.
454 if (total_compressed <= blocksize &&
455 (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size))
456 goto cleanup_and_bail_uncompressed;
458 /* we want to make sure that amount of ram required to uncompress
459 * an extent is reasonable, so we limit the total size in ram
460 * of a compressed extent to 128k. This is a crucial number
461 * because it also controls how easily we can spread reads across
462 * cpus for decompression.
464 * We also want to make sure the amount of IO required to do
465 * a random read is reasonably small, so we limit the size of
466 * a compressed extent to 128k.
468 total_compressed = min(total_compressed, max_uncompressed);
469 num_bytes = ALIGN(end - start + 1, blocksize);
470 num_bytes = max(blocksize, num_bytes);
475 * we do compression for mount -o compress and when the
476 * inode has not been flagged as nocompress. This flag can
477 * change at any time if we discover bad compression ratios.
479 if (inode_need_compress(inode)) {
481 pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS);
483 /* just bail out to the uncompressed code */
487 if (BTRFS_I(inode)->force_compress)
488 compress_type = BTRFS_I(inode)->force_compress;
491 * we need to call clear_page_dirty_for_io on each
492 * page in the range. Otherwise applications with the file
493 * mmap'd can wander in and change the page contents while
494 * we are compressing them.
496 * If the compression fails for any reason, we set the pages
497 * dirty again later on.
499 extent_range_clear_dirty_for_io(inode, start, end);
501 ret = btrfs_compress_pages(compress_type,
502 inode->i_mapping, start,
503 total_compressed, pages,
504 nr_pages, &nr_pages_ret,
510 unsigned long offset = total_compressed &
511 (PAGE_CACHE_SIZE - 1);
512 struct page *page = pages[nr_pages_ret - 1];
515 /* zero the tail end of the last page, we might be
516 * sending it down to disk
519 kaddr = kmap_atomic(page);
520 memset(kaddr + offset, 0,
521 PAGE_CACHE_SIZE - offset);
522 kunmap_atomic(kaddr);
529 /* lets try to make an inline extent */
530 if (ret || total_in < (actual_end - start)) {
531 /* we didn't compress the entire range, try
532 * to make an uncompressed inline extent.
534 ret = cow_file_range_inline(root, inode, start, end,
537 /* try making a compressed inline extent */
538 ret = cow_file_range_inline(root, inode, start, end,
540 compress_type, pages);
543 unsigned long clear_flags = EXTENT_DELALLOC |
545 unsigned long page_error_op;
547 clear_flags |= (ret < 0) ? EXTENT_DO_ACCOUNTING : 0;
548 page_error_op = ret < 0 ? PAGE_SET_ERROR : 0;
551 * inline extent creation worked or returned error,
552 * we don't need to create any more async work items.
553 * Unlock and free up our temp pages.
555 extent_clear_unlock_delalloc(inode, start, end, NULL,
556 clear_flags, PAGE_UNLOCK |
567 * we aren't doing an inline extent round the compressed size
568 * up to a block size boundary so the allocator does sane
571 total_compressed = ALIGN(total_compressed, blocksize);
574 * one last check to make sure the compression is really a
575 * win, compare the page count read with the blocks on disk
577 total_in = ALIGN(total_in, PAGE_CACHE_SIZE);
578 if (total_compressed >= total_in) {
581 num_bytes = total_in;
584 if (!will_compress && pages) {
586 * the compression code ran but failed to make things smaller,
587 * free any pages it allocated and our page pointer array
589 for (i = 0; i < nr_pages_ret; i++) {
590 WARN_ON(pages[i]->mapping);
591 page_cache_release(pages[i]);
595 total_compressed = 0;
598 /* flag the file so we don't compress in the future */
599 if (!btrfs_test_opt(root, FORCE_COMPRESS) &&
600 !(BTRFS_I(inode)->force_compress)) {
601 BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
607 /* the async work queues will take care of doing actual
608 * allocation on disk for these compressed pages,
609 * and will submit them to the elevator.
611 add_async_extent(async_cow, start, num_bytes,
612 total_compressed, pages, nr_pages_ret,
615 if (start + num_bytes < end) {
622 cleanup_and_bail_uncompressed:
624 * No compression, but we still need to write the pages in
625 * the file we've been given so far. redirty the locked
626 * page if it corresponds to our extent and set things up
627 * for the async work queue to run cow_file_range to do
628 * the normal delalloc dance
630 if (page_offset(locked_page) >= start &&
631 page_offset(locked_page) <= end) {
632 __set_page_dirty_nobuffers(locked_page);
633 /* unlocked later on in the async handlers */
636 extent_range_redirty_for_io(inode, start, end);
637 add_async_extent(async_cow, start, end - start + 1,
638 0, NULL, 0, BTRFS_COMPRESS_NONE);
645 for (i = 0; i < nr_pages_ret; i++) {
646 WARN_ON(pages[i]->mapping);
647 page_cache_release(pages[i]);
652 static void free_async_extent_pages(struct async_extent *async_extent)
656 if (!async_extent->pages)
659 for (i = 0; i < async_extent->nr_pages; i++) {
660 WARN_ON(async_extent->pages[i]->mapping);
661 page_cache_release(async_extent->pages[i]);
663 kfree(async_extent->pages);
664 async_extent->nr_pages = 0;
665 async_extent->pages = NULL;
669 * phase two of compressed writeback. This is the ordered portion
670 * of the code, which only gets called in the order the work was
671 * queued. We walk all the async extents created by compress_file_range
672 * and send them down to the disk.
674 static noinline void submit_compressed_extents(struct inode *inode,
675 struct async_cow *async_cow)
677 struct async_extent *async_extent;
679 struct btrfs_key ins;
680 struct extent_map *em;
681 struct btrfs_root *root = BTRFS_I(inode)->root;
682 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
683 struct extent_io_tree *io_tree;
687 while (!list_empty(&async_cow->extents)) {
688 async_extent = list_entry(async_cow->extents.next,
689 struct async_extent, list);
690 list_del(&async_extent->list);
692 io_tree = &BTRFS_I(inode)->io_tree;
695 /* did the compression code fall back to uncompressed IO? */
696 if (!async_extent->pages) {
697 int page_started = 0;
698 unsigned long nr_written = 0;
700 lock_extent(io_tree, async_extent->start,
701 async_extent->start +
702 async_extent->ram_size - 1);
704 /* allocate blocks */
705 ret = cow_file_range(inode, async_cow->locked_page,
707 async_extent->start +
708 async_extent->ram_size - 1,
709 &page_started, &nr_written, 0);
714 * if page_started, cow_file_range inserted an
715 * inline extent and took care of all the unlocking
716 * and IO for us. Otherwise, we need to submit
717 * all those pages down to the drive.
719 if (!page_started && !ret)
720 extent_write_locked_range(io_tree,
721 inode, async_extent->start,
722 async_extent->start +
723 async_extent->ram_size - 1,
727 unlock_page(async_cow->locked_page);
733 lock_extent(io_tree, async_extent->start,
734 async_extent->start + async_extent->ram_size - 1);
736 ret = btrfs_reserve_extent(root,
737 async_extent->compressed_size,
738 async_extent->compressed_size,
739 0, alloc_hint, &ins, 1, 1);
741 free_async_extent_pages(async_extent);
743 if (ret == -ENOSPC) {
744 unlock_extent(io_tree, async_extent->start,
745 async_extent->start +
746 async_extent->ram_size - 1);
749 * we need to redirty the pages if we decide to
750 * fallback to uncompressed IO, otherwise we
751 * will not submit these pages down to lower
754 extent_range_redirty_for_io(inode,
756 async_extent->start +
757 async_extent->ram_size - 1);
764 * here we're doing allocation and writeback of the
767 btrfs_drop_extent_cache(inode, async_extent->start,
768 async_extent->start +
769 async_extent->ram_size - 1, 0);
771 em = alloc_extent_map();
774 goto out_free_reserve;
776 em->start = async_extent->start;
777 em->len = async_extent->ram_size;
778 em->orig_start = em->start;
779 em->mod_start = em->start;
780 em->mod_len = em->len;
782 em->block_start = ins.objectid;
783 em->block_len = ins.offset;
784 em->orig_block_len = ins.offset;
785 em->ram_bytes = async_extent->ram_size;
786 em->bdev = root->fs_info->fs_devices->latest_bdev;
787 em->compress_type = async_extent->compress_type;
788 set_bit(EXTENT_FLAG_PINNED, &em->flags);
789 set_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
793 write_lock(&em_tree->lock);
794 ret = add_extent_mapping(em_tree, em, 1);
795 write_unlock(&em_tree->lock);
796 if (ret != -EEXIST) {
800 btrfs_drop_extent_cache(inode, async_extent->start,
801 async_extent->start +
802 async_extent->ram_size - 1, 0);
806 goto out_free_reserve;
808 ret = btrfs_add_ordered_extent_compress(inode,
811 async_extent->ram_size,
813 BTRFS_ORDERED_COMPRESSED,
814 async_extent->compress_type);
816 btrfs_drop_extent_cache(inode, async_extent->start,
817 async_extent->start +
818 async_extent->ram_size - 1, 0);
819 goto out_free_reserve;
823 * clear dirty, set writeback and unlock the pages.
825 extent_clear_unlock_delalloc(inode, async_extent->start,
826 async_extent->start +
827 async_extent->ram_size - 1,
828 NULL, EXTENT_LOCKED | EXTENT_DELALLOC,
829 PAGE_UNLOCK | PAGE_CLEAR_DIRTY |
831 ret = btrfs_submit_compressed_write(inode,
833 async_extent->ram_size,
835 ins.offset, async_extent->pages,
836 async_extent->nr_pages);
838 struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
839 struct page *p = async_extent->pages[0];
840 const u64 start = async_extent->start;
841 const u64 end = start + async_extent->ram_size - 1;
843 p->mapping = inode->i_mapping;
844 tree->ops->writepage_end_io_hook(p, start, end,
847 extent_clear_unlock_delalloc(inode, start, end, NULL, 0,
850 free_async_extent_pages(async_extent);
852 alloc_hint = ins.objectid + ins.offset;
858 btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 1);
860 extent_clear_unlock_delalloc(inode, async_extent->start,
861 async_extent->start +
862 async_extent->ram_size - 1,
863 NULL, EXTENT_LOCKED | EXTENT_DELALLOC |
864 EXTENT_DEFRAG | EXTENT_DO_ACCOUNTING,
865 PAGE_UNLOCK | PAGE_CLEAR_DIRTY |
866 PAGE_SET_WRITEBACK | PAGE_END_WRITEBACK |
868 free_async_extent_pages(async_extent);
873 static u64 get_extent_allocation_hint(struct inode *inode, u64 start,
876 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
877 struct extent_map *em;
880 read_lock(&em_tree->lock);
881 em = search_extent_mapping(em_tree, start, num_bytes);
884 * if block start isn't an actual block number then find the
885 * first block in this inode and use that as a hint. If that
886 * block is also bogus then just don't worry about it.
888 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
890 em = search_extent_mapping(em_tree, 0, 0);
891 if (em && em->block_start < EXTENT_MAP_LAST_BYTE)
892 alloc_hint = em->block_start;
896 alloc_hint = em->block_start;
900 read_unlock(&em_tree->lock);
906 * when extent_io.c finds a delayed allocation range in the file,
907 * the call backs end up in this code. The basic idea is to
908 * allocate extents on disk for the range, and create ordered data structs
909 * in ram to track those extents.
911 * locked_page is the page that writepage had locked already. We use
912 * it to make sure we don't do extra locks or unlocks.
914 * *page_started is set to one if we unlock locked_page and do everything
915 * required to start IO on it. It may be clean and already done with
918 static noinline int cow_file_range(struct inode *inode,
919 struct page *locked_page,
920 u64 start, u64 end, int *page_started,
921 unsigned long *nr_written,
924 struct btrfs_root *root = BTRFS_I(inode)->root;
927 unsigned long ram_size;
930 u64 blocksize = root->sectorsize;
931 struct btrfs_key ins;
932 struct extent_map *em;
933 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
936 if (btrfs_is_free_space_inode(inode)) {
942 num_bytes = ALIGN(end - start + 1, blocksize);
943 num_bytes = max(blocksize, num_bytes);
944 disk_num_bytes = num_bytes;
946 /* if this is a small write inside eof, kick off defrag */
947 if (num_bytes < 64 * 1024 &&
948 (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size))
949 btrfs_add_inode_defrag(NULL, inode);
952 /* lets try to make an inline extent */
953 ret = cow_file_range_inline(root, inode, start, end, 0, 0,
956 extent_clear_unlock_delalloc(inode, start, end, NULL,
957 EXTENT_LOCKED | EXTENT_DELALLOC |
958 EXTENT_DEFRAG, PAGE_UNLOCK |
959 PAGE_CLEAR_DIRTY | PAGE_SET_WRITEBACK |
962 *nr_written = *nr_written +
963 (end - start + PAGE_CACHE_SIZE) / PAGE_CACHE_SIZE;
966 } else if (ret < 0) {
971 BUG_ON(disk_num_bytes >
972 btrfs_super_total_bytes(root->fs_info->super_copy));
974 alloc_hint = get_extent_allocation_hint(inode, start, num_bytes);
975 btrfs_drop_extent_cache(inode, start, start + num_bytes - 1, 0);
977 while (disk_num_bytes > 0) {
980 cur_alloc_size = disk_num_bytes;
981 ret = btrfs_reserve_extent(root, cur_alloc_size,
982 root->sectorsize, 0, alloc_hint,
987 em = alloc_extent_map();
993 em->orig_start = em->start;
994 ram_size = ins.offset;
995 em->len = ins.offset;
996 em->mod_start = em->start;
997 em->mod_len = em->len;
999 em->block_start = ins.objectid;
1000 em->block_len = ins.offset;
1001 em->orig_block_len = ins.offset;
1002 em->ram_bytes = ram_size;
1003 em->bdev = root->fs_info->fs_devices->latest_bdev;
1004 set_bit(EXTENT_FLAG_PINNED, &em->flags);
1005 em->generation = -1;
1008 write_lock(&em_tree->lock);
1009 ret = add_extent_mapping(em_tree, em, 1);
1010 write_unlock(&em_tree->lock);
1011 if (ret != -EEXIST) {
1012 free_extent_map(em);
1015 btrfs_drop_extent_cache(inode, start,
1016 start + ram_size - 1, 0);
1021 cur_alloc_size = ins.offset;
1022 ret = btrfs_add_ordered_extent(inode, start, ins.objectid,
1023 ram_size, cur_alloc_size, 0);
1025 goto out_drop_extent_cache;
1027 if (root->root_key.objectid ==
1028 BTRFS_DATA_RELOC_TREE_OBJECTID) {
1029 ret = btrfs_reloc_clone_csums(inode, start,
1032 goto out_drop_extent_cache;
1035 if (disk_num_bytes < cur_alloc_size)
1038 /* we're not doing compressed IO, don't unlock the first
1039 * page (which the caller expects to stay locked), don't
1040 * clear any dirty bits and don't set any writeback bits
1042 * Do set the Private2 bit so we know this page was properly
1043 * setup for writepage
1045 op = unlock ? PAGE_UNLOCK : 0;
1046 op |= PAGE_SET_PRIVATE2;
1048 extent_clear_unlock_delalloc(inode, start,
1049 start + ram_size - 1, locked_page,
1050 EXTENT_LOCKED | EXTENT_DELALLOC,
1052 disk_num_bytes -= cur_alloc_size;
1053 num_bytes -= cur_alloc_size;
1054 alloc_hint = ins.objectid + ins.offset;
1055 start += cur_alloc_size;
1060 out_drop_extent_cache:
1061 btrfs_drop_extent_cache(inode, start, start + ram_size - 1, 0);
1063 btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 1);
1065 extent_clear_unlock_delalloc(inode, start, end, locked_page,
1066 EXTENT_LOCKED | EXTENT_DO_ACCOUNTING |
1067 EXTENT_DELALLOC | EXTENT_DEFRAG,
1068 PAGE_UNLOCK | PAGE_CLEAR_DIRTY |
1069 PAGE_SET_WRITEBACK | PAGE_END_WRITEBACK);
1074 * work queue call back to started compression on a file and pages
1076 static noinline void async_cow_start(struct btrfs_work *work)
1078 struct async_cow *async_cow;
1080 async_cow = container_of(work, struct async_cow, work);
1082 compress_file_range(async_cow->inode, async_cow->locked_page,
1083 async_cow->start, async_cow->end, async_cow,
1085 if (num_added == 0) {
1086 btrfs_add_delayed_iput(async_cow->inode);
1087 async_cow->inode = NULL;
1092 * work queue call back to submit previously compressed pages
1094 static noinline void async_cow_submit(struct btrfs_work *work)
1096 struct async_cow *async_cow;
1097 struct btrfs_root *root;
1098 unsigned long nr_pages;
1100 async_cow = container_of(work, struct async_cow, work);
1102 root = async_cow->root;
1103 nr_pages = (async_cow->end - async_cow->start + PAGE_CACHE_SIZE) >>
1107 * atomic_sub_return implies a barrier for waitqueue_active
1109 if (atomic_sub_return(nr_pages, &root->fs_info->async_delalloc_pages) <
1111 waitqueue_active(&root->fs_info->async_submit_wait))
1112 wake_up(&root->fs_info->async_submit_wait);
1114 if (async_cow->inode)
1115 submit_compressed_extents(async_cow->inode, async_cow);
1118 static noinline void async_cow_free(struct btrfs_work *work)
1120 struct async_cow *async_cow;
1121 async_cow = container_of(work, struct async_cow, work);
1122 if (async_cow->inode)
1123 btrfs_add_delayed_iput(async_cow->inode);
1127 static int cow_file_range_async(struct inode *inode, struct page *locked_page,
1128 u64 start, u64 end, int *page_started,
1129 unsigned long *nr_written)
1131 struct async_cow *async_cow;
1132 struct btrfs_root *root = BTRFS_I(inode)->root;
1133 unsigned long nr_pages;
1135 int limit = 10 * 1024 * 1024;
1137 clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, EXTENT_LOCKED,
1138 1, 0, NULL, GFP_NOFS);
1139 while (start < end) {
1140 async_cow = kmalloc(sizeof(*async_cow), GFP_NOFS);
1141 BUG_ON(!async_cow); /* -ENOMEM */
1142 async_cow->inode = igrab(inode);
1143 async_cow->root = root;
1144 async_cow->locked_page = locked_page;
1145 async_cow->start = start;
1147 if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS &&
1148 !btrfs_test_opt(root, FORCE_COMPRESS))
1151 cur_end = min(end, start + 512 * 1024 - 1);
1153 async_cow->end = cur_end;
1154 INIT_LIST_HEAD(&async_cow->extents);
1156 btrfs_init_work(&async_cow->work,
1157 btrfs_delalloc_helper,
1158 async_cow_start, async_cow_submit,
1161 nr_pages = (cur_end - start + PAGE_CACHE_SIZE) >>
1163 atomic_add(nr_pages, &root->fs_info->async_delalloc_pages);
1165 btrfs_queue_work(root->fs_info->delalloc_workers,
1168 if (atomic_read(&root->fs_info->async_delalloc_pages) > limit) {
1169 wait_event(root->fs_info->async_submit_wait,
1170 (atomic_read(&root->fs_info->async_delalloc_pages) <
1174 while (atomic_read(&root->fs_info->async_submit_draining) &&
1175 atomic_read(&root->fs_info->async_delalloc_pages)) {
1176 wait_event(root->fs_info->async_submit_wait,
1177 (atomic_read(&root->fs_info->async_delalloc_pages) ==
1181 *nr_written += nr_pages;
1182 start = cur_end + 1;
1188 static noinline int csum_exist_in_range(struct btrfs_root *root,
1189 u64 bytenr, u64 num_bytes)
1192 struct btrfs_ordered_sum *sums;
1195 ret = btrfs_lookup_csums_range(root->fs_info->csum_root, bytenr,
1196 bytenr + num_bytes - 1, &list, 0);
1197 if (ret == 0 && list_empty(&list))
1200 while (!list_empty(&list)) {
1201 sums = list_entry(list.next, struct btrfs_ordered_sum, list);
1202 list_del(&sums->list);
1209 * when nowcow writeback call back. This checks for snapshots or COW copies
1210 * of the extents that exist in the file, and COWs the file as required.
1212 * If no cow copies or snapshots exist, we write directly to the existing
1215 static noinline int run_delalloc_nocow(struct inode *inode,
1216 struct page *locked_page,
1217 u64 start, u64 end, int *page_started, int force,
1218 unsigned long *nr_written)
1220 struct btrfs_root *root = BTRFS_I(inode)->root;
1221 struct btrfs_trans_handle *trans;
1222 struct extent_buffer *leaf;
1223 struct btrfs_path *path;
1224 struct btrfs_file_extent_item *fi;
1225 struct btrfs_key found_key;
1240 u64 ino = btrfs_ino(inode);
1242 path = btrfs_alloc_path();
1244 extent_clear_unlock_delalloc(inode, start, end, locked_page,
1245 EXTENT_LOCKED | EXTENT_DELALLOC |
1246 EXTENT_DO_ACCOUNTING |
1247 EXTENT_DEFRAG, PAGE_UNLOCK |
1249 PAGE_SET_WRITEBACK |
1250 PAGE_END_WRITEBACK);
1254 nolock = btrfs_is_free_space_inode(inode);
1257 trans = btrfs_join_transaction_nolock(root);
1259 trans = btrfs_join_transaction(root);
1261 if (IS_ERR(trans)) {
1262 extent_clear_unlock_delalloc(inode, start, end, locked_page,
1263 EXTENT_LOCKED | EXTENT_DELALLOC |
1264 EXTENT_DO_ACCOUNTING |
1265 EXTENT_DEFRAG, PAGE_UNLOCK |
1267 PAGE_SET_WRITEBACK |
1268 PAGE_END_WRITEBACK);
1269 btrfs_free_path(path);
1270 return PTR_ERR(trans);
1273 trans->block_rsv = &root->fs_info->delalloc_block_rsv;
1275 cow_start = (u64)-1;
1278 ret = btrfs_lookup_file_extent(trans, root, path, ino,
1282 if (ret > 0 && path->slots[0] > 0 && check_prev) {
1283 leaf = path->nodes[0];
1284 btrfs_item_key_to_cpu(leaf, &found_key,
1285 path->slots[0] - 1);
1286 if (found_key.objectid == ino &&
1287 found_key.type == BTRFS_EXTENT_DATA_KEY)
1292 leaf = path->nodes[0];
1293 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
1294 ret = btrfs_next_leaf(root, path);
1299 leaf = path->nodes[0];
1305 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1307 if (found_key.objectid > ino)
1309 if (WARN_ON_ONCE(found_key.objectid < ino) ||
1310 found_key.type < BTRFS_EXTENT_DATA_KEY) {
1314 if (found_key.type > BTRFS_EXTENT_DATA_KEY ||
1315 found_key.offset > end)
1318 if (found_key.offset > cur_offset) {
1319 extent_end = found_key.offset;
1324 fi = btrfs_item_ptr(leaf, path->slots[0],
1325 struct btrfs_file_extent_item);
1326 extent_type = btrfs_file_extent_type(leaf, fi);
1328 ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi);
1329 if (extent_type == BTRFS_FILE_EXTENT_REG ||
1330 extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
1331 disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
1332 extent_offset = btrfs_file_extent_offset(leaf, fi);
1333 extent_end = found_key.offset +
1334 btrfs_file_extent_num_bytes(leaf, fi);
1336 btrfs_file_extent_disk_num_bytes(leaf, fi);
1337 if (extent_end <= start) {
1341 if (disk_bytenr == 0)
1343 if (btrfs_file_extent_compression(leaf, fi) ||
1344 btrfs_file_extent_encryption(leaf, fi) ||
1345 btrfs_file_extent_other_encoding(leaf, fi))
1347 if (extent_type == BTRFS_FILE_EXTENT_REG && !force)
1349 if (btrfs_extent_readonly(root, disk_bytenr))
1351 if (btrfs_cross_ref_exist(trans, root, ino,
1353 extent_offset, disk_bytenr))
1355 disk_bytenr += extent_offset;
1356 disk_bytenr += cur_offset - found_key.offset;
1357 num_bytes = min(end + 1, extent_end) - cur_offset;
1359 * if there are pending snapshots for this root,
1360 * we fall into common COW way.
1363 err = btrfs_start_write_no_snapshoting(root);
1368 * force cow if csum exists in the range.
1369 * this ensure that csum for a given extent are
1370 * either valid or do not exist.
1372 if (csum_exist_in_range(root, disk_bytenr, num_bytes))
1375 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
1376 extent_end = found_key.offset +
1377 btrfs_file_extent_inline_len(leaf,
1378 path->slots[0], fi);
1379 extent_end = ALIGN(extent_end, root->sectorsize);
1384 if (extent_end <= start) {
1386 if (!nolock && nocow)
1387 btrfs_end_write_no_snapshoting(root);
1391 if (cow_start == (u64)-1)
1392 cow_start = cur_offset;
1393 cur_offset = extent_end;
1394 if (cur_offset > end)
1400 btrfs_release_path(path);
1401 if (cow_start != (u64)-1) {
1402 ret = cow_file_range(inode, locked_page,
1403 cow_start, found_key.offset - 1,
1404 page_started, nr_written, 1);
1406 if (!nolock && nocow)
1407 btrfs_end_write_no_snapshoting(root);
1410 cow_start = (u64)-1;
1413 if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
1414 struct extent_map *em;
1415 struct extent_map_tree *em_tree;
1416 em_tree = &BTRFS_I(inode)->extent_tree;
1417 em = alloc_extent_map();
1418 BUG_ON(!em); /* -ENOMEM */
1419 em->start = cur_offset;
1420 em->orig_start = found_key.offset - extent_offset;
1421 em->len = num_bytes;
1422 em->block_len = num_bytes;
1423 em->block_start = disk_bytenr;
1424 em->orig_block_len = disk_num_bytes;
1425 em->ram_bytes = ram_bytes;
1426 em->bdev = root->fs_info->fs_devices->latest_bdev;
1427 em->mod_start = em->start;
1428 em->mod_len = em->len;
1429 set_bit(EXTENT_FLAG_PINNED, &em->flags);
1430 set_bit(EXTENT_FLAG_FILLING, &em->flags);
1431 em->generation = -1;
1433 write_lock(&em_tree->lock);
1434 ret = add_extent_mapping(em_tree, em, 1);
1435 write_unlock(&em_tree->lock);
1436 if (ret != -EEXIST) {
1437 free_extent_map(em);
1440 btrfs_drop_extent_cache(inode, em->start,
1441 em->start + em->len - 1, 0);
1443 type = BTRFS_ORDERED_PREALLOC;
1445 type = BTRFS_ORDERED_NOCOW;
1448 ret = btrfs_add_ordered_extent(inode, cur_offset, disk_bytenr,
1449 num_bytes, num_bytes, type);
1450 BUG_ON(ret); /* -ENOMEM */
1452 if (root->root_key.objectid ==
1453 BTRFS_DATA_RELOC_TREE_OBJECTID) {
1454 ret = btrfs_reloc_clone_csums(inode, cur_offset,
1457 if (!nolock && nocow)
1458 btrfs_end_write_no_snapshoting(root);
1463 extent_clear_unlock_delalloc(inode, cur_offset,
1464 cur_offset + num_bytes - 1,
1465 locked_page, EXTENT_LOCKED |
1466 EXTENT_DELALLOC, PAGE_UNLOCK |
1468 if (!nolock && nocow)
1469 btrfs_end_write_no_snapshoting(root);
1470 cur_offset = extent_end;
1471 if (cur_offset > end)
1474 btrfs_release_path(path);
1476 if (cur_offset <= end && cow_start == (u64)-1) {
1477 cow_start = cur_offset;
1481 if (cow_start != (u64)-1) {
1482 ret = cow_file_range(inode, locked_page, cow_start, end,
1483 page_started, nr_written, 1);
1489 err = btrfs_end_transaction(trans, root);
1493 if (ret && cur_offset < end)
1494 extent_clear_unlock_delalloc(inode, cur_offset, end,
1495 locked_page, EXTENT_LOCKED |
1496 EXTENT_DELALLOC | EXTENT_DEFRAG |
1497 EXTENT_DO_ACCOUNTING, PAGE_UNLOCK |
1499 PAGE_SET_WRITEBACK |
1500 PAGE_END_WRITEBACK);
1501 btrfs_free_path(path);
1505 static inline int need_force_cow(struct inode *inode, u64 start, u64 end)
1508 if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) &&
1509 !(BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC))
1513 * @defrag_bytes is a hint value, no spinlock held here,
1514 * if is not zero, it means the file is defragging.
1515 * Force cow if given extent needs to be defragged.
1517 if (BTRFS_I(inode)->defrag_bytes &&
1518 test_range_bit(&BTRFS_I(inode)->io_tree, start, end,
1519 EXTENT_DEFRAG, 0, NULL))
1526 * extent_io.c call back to do delayed allocation processing
1528 static int run_delalloc_range(struct inode *inode, struct page *locked_page,
1529 u64 start, u64 end, int *page_started,
1530 unsigned long *nr_written)
1533 int force_cow = need_force_cow(inode, start, end);
1535 if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW && !force_cow) {
1536 ret = run_delalloc_nocow(inode, locked_page, start, end,
1537 page_started, 1, nr_written);
1538 } else if (BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC && !force_cow) {
1539 ret = run_delalloc_nocow(inode, locked_page, start, end,
1540 page_started, 0, nr_written);
1541 } else if (!inode_need_compress(inode)) {
1542 ret = cow_file_range(inode, locked_page, start, end,
1543 page_started, nr_written, 1);
1545 set_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1546 &BTRFS_I(inode)->runtime_flags);
1547 ret = cow_file_range_async(inode, locked_page, start, end,
1548 page_started, nr_written);
1553 static void btrfs_split_extent_hook(struct inode *inode,
1554 struct extent_state *orig, u64 split)
1558 /* not delalloc, ignore it */
1559 if (!(orig->state & EXTENT_DELALLOC))
1562 size = orig->end - orig->start + 1;
1563 if (size > BTRFS_MAX_EXTENT_SIZE) {
1568 * See the explanation in btrfs_merge_extent_hook, the same
1569 * applies here, just in reverse.
1571 new_size = orig->end - split + 1;
1572 num_extents = div64_u64(new_size + BTRFS_MAX_EXTENT_SIZE - 1,
1573 BTRFS_MAX_EXTENT_SIZE);
1574 new_size = split - orig->start;
1575 num_extents += div64_u64(new_size + BTRFS_MAX_EXTENT_SIZE - 1,
1576 BTRFS_MAX_EXTENT_SIZE);
1577 if (div64_u64(size + BTRFS_MAX_EXTENT_SIZE - 1,
1578 BTRFS_MAX_EXTENT_SIZE) >= num_extents)
1582 spin_lock(&BTRFS_I(inode)->lock);
1583 BTRFS_I(inode)->outstanding_extents++;
1584 spin_unlock(&BTRFS_I(inode)->lock);
1588 * extent_io.c merge_extent_hook, used to track merged delayed allocation
1589 * extents so we can keep track of new extents that are just merged onto old
1590 * extents, such as when we are doing sequential writes, so we can properly
1591 * account for the metadata space we'll need.
1593 static void btrfs_merge_extent_hook(struct inode *inode,
1594 struct extent_state *new,
1595 struct extent_state *other)
1597 u64 new_size, old_size;
1600 /* not delalloc, ignore it */
1601 if (!(other->state & EXTENT_DELALLOC))
1604 if (new->start > other->start)
1605 new_size = new->end - other->start + 1;
1607 new_size = other->end - new->start + 1;
1609 /* we're not bigger than the max, unreserve the space and go */
1610 if (new_size <= BTRFS_MAX_EXTENT_SIZE) {
1611 spin_lock(&BTRFS_I(inode)->lock);
1612 BTRFS_I(inode)->outstanding_extents--;
1613 spin_unlock(&BTRFS_I(inode)->lock);
1618 * We have to add up either side to figure out how many extents were
1619 * accounted for before we merged into one big extent. If the number of
1620 * extents we accounted for is <= the amount we need for the new range
1621 * then we can return, otherwise drop. Think of it like this
1625 * So we've grown the extent by a MAX_SIZE extent, this would mean we
1626 * need 2 outstanding extents, on one side we have 1 and the other side
1627 * we have 1 so they are == and we can return. But in this case
1629 * [MAX_SIZE+4k][MAX_SIZE+4k]
1631 * Each range on their own accounts for 2 extents, but merged together
1632 * they are only 3 extents worth of accounting, so we need to drop in
1635 old_size = other->end - other->start + 1;
1636 num_extents = div64_u64(old_size + BTRFS_MAX_EXTENT_SIZE - 1,
1637 BTRFS_MAX_EXTENT_SIZE);
1638 old_size = new->end - new->start + 1;
1639 num_extents += div64_u64(old_size + BTRFS_MAX_EXTENT_SIZE - 1,
1640 BTRFS_MAX_EXTENT_SIZE);
1642 if (div64_u64(new_size + BTRFS_MAX_EXTENT_SIZE - 1,
1643 BTRFS_MAX_EXTENT_SIZE) >= num_extents)
1646 spin_lock(&BTRFS_I(inode)->lock);
1647 BTRFS_I(inode)->outstanding_extents--;
1648 spin_unlock(&BTRFS_I(inode)->lock);
1651 static void btrfs_add_delalloc_inodes(struct btrfs_root *root,
1652 struct inode *inode)
1654 spin_lock(&root->delalloc_lock);
1655 if (list_empty(&BTRFS_I(inode)->delalloc_inodes)) {
1656 list_add_tail(&BTRFS_I(inode)->delalloc_inodes,
1657 &root->delalloc_inodes);
1658 set_bit(BTRFS_INODE_IN_DELALLOC_LIST,
1659 &BTRFS_I(inode)->runtime_flags);
1660 root->nr_delalloc_inodes++;
1661 if (root->nr_delalloc_inodes == 1) {
1662 spin_lock(&root->fs_info->delalloc_root_lock);
1663 BUG_ON(!list_empty(&root->delalloc_root));
1664 list_add_tail(&root->delalloc_root,
1665 &root->fs_info->delalloc_roots);
1666 spin_unlock(&root->fs_info->delalloc_root_lock);
1669 spin_unlock(&root->delalloc_lock);
1672 static void btrfs_del_delalloc_inode(struct btrfs_root *root,
1673 struct inode *inode)
1675 spin_lock(&root->delalloc_lock);
1676 if (!list_empty(&BTRFS_I(inode)->delalloc_inodes)) {
1677 list_del_init(&BTRFS_I(inode)->delalloc_inodes);
1678 clear_bit(BTRFS_INODE_IN_DELALLOC_LIST,
1679 &BTRFS_I(inode)->runtime_flags);
1680 root->nr_delalloc_inodes--;
1681 if (!root->nr_delalloc_inodes) {
1682 spin_lock(&root->fs_info->delalloc_root_lock);
1683 BUG_ON(list_empty(&root->delalloc_root));
1684 list_del_init(&root->delalloc_root);
1685 spin_unlock(&root->fs_info->delalloc_root_lock);
1688 spin_unlock(&root->delalloc_lock);
1692 * extent_io.c set_bit_hook, used to track delayed allocation
1693 * bytes in this file, and to maintain the list of inodes that
1694 * have pending delalloc work to be done.
1696 static void btrfs_set_bit_hook(struct inode *inode,
1697 struct extent_state *state, unsigned *bits)
1700 if ((*bits & EXTENT_DEFRAG) && !(*bits & EXTENT_DELALLOC))
1703 * set_bit and clear bit hooks normally require _irqsave/restore
1704 * but in this case, we are only testing for the DELALLOC
1705 * bit, which is only set or cleared with irqs on
1707 if (!(state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) {
1708 struct btrfs_root *root = BTRFS_I(inode)->root;
1709 u64 len = state->end + 1 - state->start;
1710 bool do_list = !btrfs_is_free_space_inode(inode);
1712 if (*bits & EXTENT_FIRST_DELALLOC) {
1713 *bits &= ~EXTENT_FIRST_DELALLOC;
1715 spin_lock(&BTRFS_I(inode)->lock);
1716 BTRFS_I(inode)->outstanding_extents++;
1717 spin_unlock(&BTRFS_I(inode)->lock);
1720 /* For sanity tests */
1721 if (btrfs_test_is_dummy_root(root))
1724 __percpu_counter_add(&root->fs_info->delalloc_bytes, len,
1725 root->fs_info->delalloc_batch);
1726 spin_lock(&BTRFS_I(inode)->lock);
1727 BTRFS_I(inode)->delalloc_bytes += len;
1728 if (*bits & EXTENT_DEFRAG)
1729 BTRFS_I(inode)->defrag_bytes += len;
1730 if (do_list && !test_bit(BTRFS_INODE_IN_DELALLOC_LIST,
1731 &BTRFS_I(inode)->runtime_flags))
1732 btrfs_add_delalloc_inodes(root, inode);
1733 spin_unlock(&BTRFS_I(inode)->lock);
1738 * extent_io.c clear_bit_hook, see set_bit_hook for why
1740 static void btrfs_clear_bit_hook(struct inode *inode,
1741 struct extent_state *state,
1744 u64 len = state->end + 1 - state->start;
1745 u64 num_extents = div64_u64(len + BTRFS_MAX_EXTENT_SIZE -1,
1746 BTRFS_MAX_EXTENT_SIZE);
1748 spin_lock(&BTRFS_I(inode)->lock);
1749 if ((state->state & EXTENT_DEFRAG) && (*bits & EXTENT_DEFRAG))
1750 BTRFS_I(inode)->defrag_bytes -= len;
1751 spin_unlock(&BTRFS_I(inode)->lock);
1754 * set_bit and clear bit hooks normally require _irqsave/restore
1755 * but in this case, we are only testing for the DELALLOC
1756 * bit, which is only set or cleared with irqs on
1758 if ((state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) {
1759 struct btrfs_root *root = BTRFS_I(inode)->root;
1760 bool do_list = !btrfs_is_free_space_inode(inode);
1762 if (*bits & EXTENT_FIRST_DELALLOC) {
1763 *bits &= ~EXTENT_FIRST_DELALLOC;
1764 } else if (!(*bits & EXTENT_DO_ACCOUNTING)) {
1765 spin_lock(&BTRFS_I(inode)->lock);
1766 BTRFS_I(inode)->outstanding_extents -= num_extents;
1767 spin_unlock(&BTRFS_I(inode)->lock);
1771 * We don't reserve metadata space for space cache inodes so we
1772 * don't need to call dellalloc_release_metadata if there is an
1775 if (*bits & EXTENT_DO_ACCOUNTING &&
1776 root != root->fs_info->tree_root)
1777 btrfs_delalloc_release_metadata(inode, len);
1779 /* For sanity tests. */
1780 if (btrfs_test_is_dummy_root(root))
1783 if (root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID
1784 && do_list && !(state->state & EXTENT_NORESERVE))
1785 btrfs_free_reserved_data_space_noquota(inode,
1788 __percpu_counter_add(&root->fs_info->delalloc_bytes, -len,
1789 root->fs_info->delalloc_batch);
1790 spin_lock(&BTRFS_I(inode)->lock);
1791 BTRFS_I(inode)->delalloc_bytes -= len;
1792 if (do_list && BTRFS_I(inode)->delalloc_bytes == 0 &&
1793 test_bit(BTRFS_INODE_IN_DELALLOC_LIST,
1794 &BTRFS_I(inode)->runtime_flags))
1795 btrfs_del_delalloc_inode(root, inode);
1796 spin_unlock(&BTRFS_I(inode)->lock);
1801 * extent_io.c merge_bio_hook, this must check the chunk tree to make sure
1802 * we don't create bios that span stripes or chunks
1804 int btrfs_merge_bio_hook(int rw, struct page *page, unsigned long offset,
1805 size_t size, struct bio *bio,
1806 unsigned long bio_flags)
1808 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
1809 u64 logical = (u64)bio->bi_iter.bi_sector << 9;
1814 if (bio_flags & EXTENT_BIO_COMPRESSED)
1817 length = bio->bi_iter.bi_size;
1818 map_length = length;
1819 ret = btrfs_map_block(root->fs_info, rw, logical,
1820 &map_length, NULL, 0);
1821 /* Will always return 0 with map_multi == NULL */
1823 if (map_length < length + size)
1829 * in order to insert checksums into the metadata in large chunks,
1830 * we wait until bio submission time. All the pages in the bio are
1831 * checksummed and sums are attached onto the ordered extent record.
1833 * At IO completion time the cums attached on the ordered extent record
1834 * are inserted into the btree
1836 static int __btrfs_submit_bio_start(struct inode *inode, int rw,
1837 struct bio *bio, int mirror_num,
1838 unsigned long bio_flags,
1841 struct btrfs_root *root = BTRFS_I(inode)->root;
1844 ret = btrfs_csum_one_bio(root, inode, bio, 0, 0);
1845 BUG_ON(ret); /* -ENOMEM */
1850 * in order to insert checksums into the metadata in large chunks,
1851 * we wait until bio submission time. All the pages in the bio are
1852 * checksummed and sums are attached onto the ordered extent record.
1854 * At IO completion time the cums attached on the ordered extent record
1855 * are inserted into the btree
1857 static int __btrfs_submit_bio_done(struct inode *inode, int rw, struct bio *bio,
1858 int mirror_num, unsigned long bio_flags,
1861 struct btrfs_root *root = BTRFS_I(inode)->root;
1864 ret = btrfs_map_bio(root, rw, bio, mirror_num, 1);
1866 bio->bi_error = ret;
1873 * extent_io.c submission hook. This does the right thing for csum calculation
1874 * on write, or reading the csums from the tree before a read
1876 static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
1877 int mirror_num, unsigned long bio_flags,
1880 struct btrfs_root *root = BTRFS_I(inode)->root;
1881 enum btrfs_wq_endio_type metadata = BTRFS_WQ_ENDIO_DATA;
1884 int async = !atomic_read(&BTRFS_I(inode)->sync_writers);
1886 skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
1888 if (btrfs_is_free_space_inode(inode))
1889 metadata = BTRFS_WQ_ENDIO_FREE_SPACE;
1891 if (!(rw & REQ_WRITE)) {
1892 ret = btrfs_bio_wq_end_io(root->fs_info, bio, metadata);
1896 if (bio_flags & EXTENT_BIO_COMPRESSED) {
1897 ret = btrfs_submit_compressed_read(inode, bio,
1901 } else if (!skip_sum) {
1902 ret = btrfs_lookup_bio_sums(root, inode, bio, NULL);
1907 } else if (async && !skip_sum) {
1908 /* csum items have already been cloned */
1909 if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID)
1911 /* we're doing a write, do the async checksumming */
1912 ret = btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
1913 inode, rw, bio, mirror_num,
1914 bio_flags, bio_offset,
1915 __btrfs_submit_bio_start,
1916 __btrfs_submit_bio_done);
1918 } else if (!skip_sum) {
1919 ret = btrfs_csum_one_bio(root, inode, bio, 0, 0);
1925 ret = btrfs_map_bio(root, rw, bio, mirror_num, 0);
1929 bio->bi_error = ret;
1936 * given a list of ordered sums record them in the inode. This happens
1937 * at IO completion time based on sums calculated at bio submission time.
1939 static noinline int add_pending_csums(struct btrfs_trans_handle *trans,
1940 struct inode *inode, u64 file_offset,
1941 struct list_head *list)
1943 struct btrfs_ordered_sum *sum;
1945 list_for_each_entry(sum, list, list) {
1946 trans->adding_csums = 1;
1947 btrfs_csum_file_blocks(trans,
1948 BTRFS_I(inode)->root->fs_info->csum_root, sum);
1949 trans->adding_csums = 0;
1954 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
1955 struct extent_state **cached_state)
1957 WARN_ON((end & (PAGE_CACHE_SIZE - 1)) == 0);
1958 return set_extent_delalloc(&BTRFS_I(inode)->io_tree, start, end,
1959 cached_state, GFP_NOFS);
1962 /* see btrfs_writepage_start_hook for details on why this is required */
1963 struct btrfs_writepage_fixup {
1965 struct btrfs_work work;
1968 static void btrfs_writepage_fixup_worker(struct btrfs_work *work)
1970 struct btrfs_writepage_fixup *fixup;
1971 struct btrfs_ordered_extent *ordered;
1972 struct extent_state *cached_state = NULL;
1974 struct inode *inode;
1979 fixup = container_of(work, struct btrfs_writepage_fixup, work);
1983 if (!page->mapping || !PageDirty(page) || !PageChecked(page)) {
1984 ClearPageChecked(page);
1988 inode = page->mapping->host;
1989 page_start = page_offset(page);
1990 page_end = page_offset(page) + PAGE_CACHE_SIZE - 1;
1992 lock_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end, 0,
1995 /* already ordered? We're done */
1996 if (PagePrivate2(page))
1999 ordered = btrfs_lookup_ordered_extent(inode, page_start);
2001 unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start,
2002 page_end, &cached_state, GFP_NOFS);
2004 btrfs_start_ordered_extent(inode, ordered, 1);
2005 btrfs_put_ordered_extent(ordered);
2009 ret = btrfs_delalloc_reserve_space(inode, page_start,
2012 mapping_set_error(page->mapping, ret);
2013 end_extent_writepage(page, ret, page_start, page_end);
2014 ClearPageChecked(page);
2018 btrfs_set_extent_delalloc(inode, page_start, page_end, &cached_state);
2019 ClearPageChecked(page);
2020 set_page_dirty(page);
2022 unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, page_end,
2023 &cached_state, GFP_NOFS);
2026 page_cache_release(page);
2031 * There are a few paths in the higher layers of the kernel that directly
2032 * set the page dirty bit without asking the filesystem if it is a
2033 * good idea. This causes problems because we want to make sure COW
2034 * properly happens and the data=ordered rules are followed.
2036 * In our case any range that doesn't have the ORDERED bit set
2037 * hasn't been properly setup for IO. We kick off an async process
2038 * to fix it up. The async helper will wait for ordered extents, set
2039 * the delalloc bit and make it safe to write the page.
2041 static int btrfs_writepage_start_hook(struct page *page, u64 start, u64 end)
2043 struct inode *inode = page->mapping->host;
2044 struct btrfs_writepage_fixup *fixup;
2045 struct btrfs_root *root = BTRFS_I(inode)->root;
2047 /* this page is properly in the ordered list */
2048 if (TestClearPagePrivate2(page))
2051 if (PageChecked(page))
2054 fixup = kzalloc(sizeof(*fixup), GFP_NOFS);
2058 SetPageChecked(page);
2059 page_cache_get(page);
2060 btrfs_init_work(&fixup->work, btrfs_fixup_helper,
2061 btrfs_writepage_fixup_worker, NULL, NULL);
2063 btrfs_queue_work(root->fs_info->fixup_workers, &fixup->work);
2067 static int insert_reserved_file_extent(struct btrfs_trans_handle *trans,
2068 struct inode *inode, u64 file_pos,
2069 u64 disk_bytenr, u64 disk_num_bytes,
2070 u64 num_bytes, u64 ram_bytes,
2071 u8 compression, u8 encryption,
2072 u16 other_encoding, int extent_type)
2074 struct btrfs_root *root = BTRFS_I(inode)->root;
2075 struct btrfs_file_extent_item *fi;
2076 struct btrfs_path *path;
2077 struct extent_buffer *leaf;
2078 struct btrfs_key ins;
2079 int extent_inserted = 0;
2082 path = btrfs_alloc_path();
2087 * we may be replacing one extent in the tree with another.
2088 * The new extent is pinned in the extent map, and we don't want
2089 * to drop it from the cache until it is completely in the btree.
2091 * So, tell btrfs_drop_extents to leave this extent in the cache.
2092 * the caller is expected to unpin it and allow it to be merged
2095 ret = __btrfs_drop_extents(trans, root, inode, path, file_pos,
2096 file_pos + num_bytes, NULL, 0,
2097 1, sizeof(*fi), &extent_inserted);
2101 if (!extent_inserted) {
2102 ins.objectid = btrfs_ino(inode);
2103 ins.offset = file_pos;
2104 ins.type = BTRFS_EXTENT_DATA_KEY;
2106 path->leave_spinning = 1;
2107 ret = btrfs_insert_empty_item(trans, root, path, &ins,
2112 leaf = path->nodes[0];
2113 fi = btrfs_item_ptr(leaf, path->slots[0],
2114 struct btrfs_file_extent_item);
2115 btrfs_set_file_extent_generation(leaf, fi, trans->transid);
2116 btrfs_set_file_extent_type(leaf, fi, extent_type);
2117 btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr);
2118 btrfs_set_file_extent_disk_num_bytes(leaf, fi, disk_num_bytes);
2119 btrfs_set_file_extent_offset(leaf, fi, 0);
2120 btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes);
2121 btrfs_set_file_extent_ram_bytes(leaf, fi, ram_bytes);
2122 btrfs_set_file_extent_compression(leaf, fi, compression);
2123 btrfs_set_file_extent_encryption(leaf, fi, encryption);
2124 btrfs_set_file_extent_other_encoding(leaf, fi, other_encoding);
2126 btrfs_mark_buffer_dirty(leaf);
2127 btrfs_release_path(path);
2129 inode_add_bytes(inode, num_bytes);
2131 ins.objectid = disk_bytenr;
2132 ins.offset = disk_num_bytes;
2133 ins.type = BTRFS_EXTENT_ITEM_KEY;
2134 ret = btrfs_alloc_reserved_file_extent(trans, root,
2135 root->root_key.objectid,
2136 btrfs_ino(inode), file_pos,
2139 * Release the reserved range from inode dirty range map, as it is
2140 * already moved into delayed_ref_head
2142 btrfs_qgroup_release_data(inode, file_pos, ram_bytes);
2144 btrfs_free_path(path);
2149 /* snapshot-aware defrag */
2150 struct sa_defrag_extent_backref {
2151 struct rb_node node;
2152 struct old_sa_defrag_extent *old;
2161 struct old_sa_defrag_extent {
2162 struct list_head list;
2163 struct new_sa_defrag_extent *new;
2172 struct new_sa_defrag_extent {
2173 struct rb_root root;
2174 struct list_head head;
2175 struct btrfs_path *path;
2176 struct inode *inode;
2184 static int backref_comp(struct sa_defrag_extent_backref *b1,
2185 struct sa_defrag_extent_backref *b2)
2187 if (b1->root_id < b2->root_id)
2189 else if (b1->root_id > b2->root_id)
2192 if (b1->inum < b2->inum)
2194 else if (b1->inum > b2->inum)
2197 if (b1->file_pos < b2->file_pos)
2199 else if (b1->file_pos > b2->file_pos)
2203 * [------------------------------] ===> (a range of space)
2204 * |<--->| |<---->| =============> (fs/file tree A)
2205 * |<---------------------------->| ===> (fs/file tree B)
2207 * A range of space can refer to two file extents in one tree while
2208 * refer to only one file extent in another tree.
2210 * So we may process a disk offset more than one time(two extents in A)
2211 * and locate at the same extent(one extent in B), then insert two same
2212 * backrefs(both refer to the extent in B).
2217 static void backref_insert(struct rb_root *root,
2218 struct sa_defrag_extent_backref *backref)
2220 struct rb_node **p = &root->rb_node;
2221 struct rb_node *parent = NULL;
2222 struct sa_defrag_extent_backref *entry;
2227 entry = rb_entry(parent, struct sa_defrag_extent_backref, node);
2229 ret = backref_comp(backref, entry);
2233 p = &(*p)->rb_right;
2236 rb_link_node(&backref->node, parent, p);
2237 rb_insert_color(&backref->node, root);
2241 * Note the backref might has changed, and in this case we just return 0.
2243 static noinline int record_one_backref(u64 inum, u64 offset, u64 root_id,
2246 struct btrfs_file_extent_item *extent;
2247 struct btrfs_fs_info *fs_info;
2248 struct old_sa_defrag_extent *old = ctx;
2249 struct new_sa_defrag_extent *new = old->new;
2250 struct btrfs_path *path = new->path;
2251 struct btrfs_key key;
2252 struct btrfs_root *root;
2253 struct sa_defrag_extent_backref *backref;
2254 struct extent_buffer *leaf;
2255 struct inode *inode = new->inode;
2261 if (BTRFS_I(inode)->root->root_key.objectid == root_id &&
2262 inum == btrfs_ino(inode))
2265 key.objectid = root_id;
2266 key.type = BTRFS_ROOT_ITEM_KEY;
2267 key.offset = (u64)-1;
2269 fs_info = BTRFS_I(inode)->root->fs_info;
2270 root = btrfs_read_fs_root_no_name(fs_info, &key);
2272 if (PTR_ERR(root) == -ENOENT)
2275 pr_debug("inum=%llu, offset=%llu, root_id=%llu\n",
2276 inum, offset, root_id);
2277 return PTR_ERR(root);
2280 key.objectid = inum;
2281 key.type = BTRFS_EXTENT_DATA_KEY;
2282 if (offset > (u64)-1 << 32)
2285 key.offset = offset;
2287 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2288 if (WARN_ON(ret < 0))
2295 leaf = path->nodes[0];
2296 slot = path->slots[0];
2298 if (slot >= btrfs_header_nritems(leaf)) {
2299 ret = btrfs_next_leaf(root, path);
2302 } else if (ret > 0) {
2311 btrfs_item_key_to_cpu(leaf, &key, slot);
2313 if (key.objectid > inum)
2316 if (key.objectid < inum || key.type != BTRFS_EXTENT_DATA_KEY)
2319 extent = btrfs_item_ptr(leaf, slot,
2320 struct btrfs_file_extent_item);
2322 if (btrfs_file_extent_disk_bytenr(leaf, extent) != old->bytenr)
2326 * 'offset' refers to the exact key.offset,
2327 * NOT the 'offset' field in btrfs_extent_data_ref, ie.
2328 * (key.offset - extent_offset).
2330 if (key.offset != offset)
2333 extent_offset = btrfs_file_extent_offset(leaf, extent);
2334 num_bytes = btrfs_file_extent_num_bytes(leaf, extent);
2336 if (extent_offset >= old->extent_offset + old->offset +
2337 old->len || extent_offset + num_bytes <=
2338 old->extent_offset + old->offset)
2343 backref = kmalloc(sizeof(*backref), GFP_NOFS);
2349 backref->root_id = root_id;
2350 backref->inum = inum;
2351 backref->file_pos = offset;
2352 backref->num_bytes = num_bytes;
2353 backref->extent_offset = extent_offset;
2354 backref->generation = btrfs_file_extent_generation(leaf, extent);
2356 backref_insert(&new->root, backref);
2359 btrfs_release_path(path);
2364 static noinline bool record_extent_backrefs(struct btrfs_path *path,
2365 struct new_sa_defrag_extent *new)
2367 struct btrfs_fs_info *fs_info = BTRFS_I(new->inode)->root->fs_info;
2368 struct old_sa_defrag_extent *old, *tmp;
2373 list_for_each_entry_safe(old, tmp, &new->head, list) {
2374 ret = iterate_inodes_from_logical(old->bytenr +
2375 old->extent_offset, fs_info,
2376 path, record_one_backref,
2378 if (ret < 0 && ret != -ENOENT)
2381 /* no backref to be processed for this extent */
2383 list_del(&old->list);
2388 if (list_empty(&new->head))
2394 static int relink_is_mergable(struct extent_buffer *leaf,
2395 struct btrfs_file_extent_item *fi,
2396 struct new_sa_defrag_extent *new)
2398 if (btrfs_file_extent_disk_bytenr(leaf, fi) != new->bytenr)
2401 if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG)
2404 if (btrfs_file_extent_compression(leaf, fi) != new->compress_type)
2407 if (btrfs_file_extent_encryption(leaf, fi) ||
2408 btrfs_file_extent_other_encoding(leaf, fi))
2415 * Note the backref might has changed, and in this case we just return 0.
2417 static noinline int relink_extent_backref(struct btrfs_path *path,
2418 struct sa_defrag_extent_backref *prev,
2419 struct sa_defrag_extent_backref *backref)
2421 struct btrfs_file_extent_item *extent;
2422 struct btrfs_file_extent_item *item;
2423 struct btrfs_ordered_extent *ordered;
2424 struct btrfs_trans_handle *trans;
2425 struct btrfs_fs_info *fs_info;
2426 struct btrfs_root *root;
2427 struct btrfs_key key;
2428 struct extent_buffer *leaf;
2429 struct old_sa_defrag_extent *old = backref->old;
2430 struct new_sa_defrag_extent *new = old->new;
2431 struct inode *src_inode = new->inode;
2432 struct inode *inode;
2433 struct extent_state *cached = NULL;
2442 if (prev && prev->root_id == backref->root_id &&
2443 prev->inum == backref->inum &&
2444 prev->file_pos + prev->num_bytes == backref->file_pos)
2447 /* step 1: get root */
2448 key.objectid = backref->root_id;
2449 key.type = BTRFS_ROOT_ITEM_KEY;
2450 key.offset = (u64)-1;
2452 fs_info = BTRFS_I(src_inode)->root->fs_info;
2453 index = srcu_read_lock(&fs_info->subvol_srcu);
2455 root = btrfs_read_fs_root_no_name(fs_info, &key);
2457 srcu_read_unlock(&fs_info->subvol_srcu, index);
2458 if (PTR_ERR(root) == -ENOENT)
2460 return PTR_ERR(root);
2463 if (btrfs_root_readonly(root)) {
2464 srcu_read_unlock(&fs_info->subvol_srcu, index);
2468 /* step 2: get inode */
2469 key.objectid = backref->inum;
2470 key.type = BTRFS_INODE_ITEM_KEY;
2473 inode = btrfs_iget(fs_info->sb, &key, root, NULL);
2474 if (IS_ERR(inode)) {
2475 srcu_read_unlock(&fs_info->subvol_srcu, index);
2479 srcu_read_unlock(&fs_info->subvol_srcu, index);
2481 /* step 3: relink backref */
2482 lock_start = backref->file_pos;
2483 lock_end = backref->file_pos + backref->num_bytes - 1;
2484 lock_extent_bits(&BTRFS_I(inode)->io_tree, lock_start, lock_end,
2487 ordered = btrfs_lookup_first_ordered_extent(inode, lock_end);
2489 btrfs_put_ordered_extent(ordered);
2493 trans = btrfs_join_transaction(root);
2494 if (IS_ERR(trans)) {
2495 ret = PTR_ERR(trans);
2499 key.objectid = backref->inum;
2500 key.type = BTRFS_EXTENT_DATA_KEY;
2501 key.offset = backref->file_pos;
2503 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2506 } else if (ret > 0) {
2511 extent = btrfs_item_ptr(path->nodes[0], path->slots[0],
2512 struct btrfs_file_extent_item);
2514 if (btrfs_file_extent_generation(path->nodes[0], extent) !=
2515 backref->generation)
2518 btrfs_release_path(path);
2520 start = backref->file_pos;
2521 if (backref->extent_offset < old->extent_offset + old->offset)
2522 start += old->extent_offset + old->offset -
2523 backref->extent_offset;
2525 len = min(backref->extent_offset + backref->num_bytes,
2526 old->extent_offset + old->offset + old->len);
2527 len -= max(backref->extent_offset, old->extent_offset + old->offset);
2529 ret = btrfs_drop_extents(trans, root, inode, start,
2534 key.objectid = btrfs_ino(inode);
2535 key.type = BTRFS_EXTENT_DATA_KEY;
2538 path->leave_spinning = 1;
2540 struct btrfs_file_extent_item *fi;
2542 struct btrfs_key found_key;
2544 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
2549 leaf = path->nodes[0];
2550 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2552 fi = btrfs_item_ptr(leaf, path->slots[0],
2553 struct btrfs_file_extent_item);
2554 extent_len = btrfs_file_extent_num_bytes(leaf, fi);
2556 if (extent_len + found_key.offset == start &&
2557 relink_is_mergable(leaf, fi, new)) {
2558 btrfs_set_file_extent_num_bytes(leaf, fi,
2560 btrfs_mark_buffer_dirty(leaf);
2561 inode_add_bytes(inode, len);
2567 btrfs_release_path(path);
2572 ret = btrfs_insert_empty_item(trans, root, path, &key,
2575 btrfs_abort_transaction(trans, root, ret);
2579 leaf = path->nodes[0];
2580 item = btrfs_item_ptr(leaf, path->slots[0],
2581 struct btrfs_file_extent_item);
2582 btrfs_set_file_extent_disk_bytenr(leaf, item, new->bytenr);
2583 btrfs_set_file_extent_disk_num_bytes(leaf, item, new->disk_len);
2584 btrfs_set_file_extent_offset(leaf, item, start - new->file_pos);
2585 btrfs_set_file_extent_num_bytes(leaf, item, len);
2586 btrfs_set_file_extent_ram_bytes(leaf, item, new->len);
2587 btrfs_set_file_extent_generation(leaf, item, trans->transid);
2588 btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG);
2589 btrfs_set_file_extent_compression(leaf, item, new->compress_type);
2590 btrfs_set_file_extent_encryption(leaf, item, 0);
2591 btrfs_set_file_extent_other_encoding(leaf, item, 0);
2593 btrfs_mark_buffer_dirty(leaf);
2594 inode_add_bytes(inode, len);
2595 btrfs_release_path(path);
2597 ret = btrfs_inc_extent_ref(trans, root, new->bytenr,
2599 backref->root_id, backref->inum,
2600 new->file_pos); /* start - extent_offset */
2602 btrfs_abort_transaction(trans, root, ret);
2608 btrfs_release_path(path);
2609 path->leave_spinning = 0;
2610 btrfs_end_transaction(trans, root);
2612 unlock_extent_cached(&BTRFS_I(inode)->io_tree, lock_start, lock_end,
2618 static void free_sa_defrag_extent(struct new_sa_defrag_extent *new)
2620 struct old_sa_defrag_extent *old, *tmp;
2625 list_for_each_entry_safe(old, tmp, &new->head, list) {
2631 static void relink_file_extents(struct new_sa_defrag_extent *new)
2633 struct btrfs_path *path;
2634 struct sa_defrag_extent_backref *backref;
2635 struct sa_defrag_extent_backref *prev = NULL;
2636 struct inode *inode;
2637 struct btrfs_root *root;
2638 struct rb_node *node;
2642 root = BTRFS_I(inode)->root;
2644 path = btrfs_alloc_path();
2648 if (!record_extent_backrefs(path, new)) {
2649 btrfs_free_path(path);
2652 btrfs_release_path(path);
2655 node = rb_first(&new->root);
2658 rb_erase(node, &new->root);
2660 backref = rb_entry(node, struct sa_defrag_extent_backref, node);
2662 ret = relink_extent_backref(path, prev, backref);
2675 btrfs_free_path(path);
2677 free_sa_defrag_extent(new);
2679 atomic_dec(&root->fs_info->defrag_running);
2680 wake_up(&root->fs_info->transaction_wait);
2683 static struct new_sa_defrag_extent *
2684 record_old_file_extents(struct inode *inode,
2685 struct btrfs_ordered_extent *ordered)
2687 struct btrfs_root *root = BTRFS_I(inode)->root;
2688 struct btrfs_path *path;
2689 struct btrfs_key key;
2690 struct old_sa_defrag_extent *old;
2691 struct new_sa_defrag_extent *new;
2694 new = kmalloc(sizeof(*new), GFP_NOFS);
2699 new->file_pos = ordered->file_offset;
2700 new->len = ordered->len;
2701 new->bytenr = ordered->start;
2702 new->disk_len = ordered->disk_len;
2703 new->compress_type = ordered->compress_type;
2704 new->root = RB_ROOT;
2705 INIT_LIST_HEAD(&new->head);
2707 path = btrfs_alloc_path();
2711 key.objectid = btrfs_ino(inode);
2712 key.type = BTRFS_EXTENT_DATA_KEY;
2713 key.offset = new->file_pos;
2715 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2718 if (ret > 0 && path->slots[0] > 0)
2721 /* find out all the old extents for the file range */
2723 struct btrfs_file_extent_item *extent;
2724 struct extent_buffer *l;
2733 slot = path->slots[0];
2735 if (slot >= btrfs_header_nritems(l)) {
2736 ret = btrfs_next_leaf(root, path);
2744 btrfs_item_key_to_cpu(l, &key, slot);
2746 if (key.objectid != btrfs_ino(inode))
2748 if (key.type != BTRFS_EXTENT_DATA_KEY)
2750 if (key.offset >= new->file_pos + new->len)
2753 extent = btrfs_item_ptr(l, slot, struct btrfs_file_extent_item);
2755 num_bytes = btrfs_file_extent_num_bytes(l, extent);
2756 if (key.offset + num_bytes < new->file_pos)
2759 disk_bytenr = btrfs_file_extent_disk_bytenr(l, extent);
2763 extent_offset = btrfs_file_extent_offset(l, extent);
2765 old = kmalloc(sizeof(*old), GFP_NOFS);
2769 offset = max(new->file_pos, key.offset);
2770 end = min(new->file_pos + new->len, key.offset + num_bytes);
2772 old->bytenr = disk_bytenr;
2773 old->extent_offset = extent_offset;
2774 old->offset = offset - key.offset;
2775 old->len = end - offset;
2778 list_add_tail(&old->list, &new->head);
2784 btrfs_free_path(path);
2785 atomic_inc(&root->fs_info->defrag_running);
2790 btrfs_free_path(path);
2792 free_sa_defrag_extent(new);
2796 static void btrfs_release_delalloc_bytes(struct btrfs_root *root,
2799 struct btrfs_block_group_cache *cache;
2801 cache = btrfs_lookup_block_group(root->fs_info, start);
2804 spin_lock(&cache->lock);
2805 cache->delalloc_bytes -= len;
2806 spin_unlock(&cache->lock);
2808 btrfs_put_block_group(cache);
2811 /* as ordered data IO finishes, this gets called so we can finish
2812 * an ordered extent if the range of bytes in the file it covers are
2815 static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent)
2817 struct inode *inode = ordered_extent->inode;
2818 struct btrfs_root *root = BTRFS_I(inode)->root;
2819 struct btrfs_trans_handle *trans = NULL;
2820 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2821 struct extent_state *cached_state = NULL;
2822 struct new_sa_defrag_extent *new = NULL;
2823 int compress_type = 0;
2825 u64 logical_len = ordered_extent->len;
2827 bool truncated = false;
2829 nolock = btrfs_is_free_space_inode(inode);
2831 if (test_bit(BTRFS_ORDERED_IOERR, &ordered_extent->flags)) {
2836 btrfs_free_io_failure_record(inode, ordered_extent->file_offset,
2837 ordered_extent->file_offset +
2838 ordered_extent->len - 1);
2840 if (test_bit(BTRFS_ORDERED_TRUNCATED, &ordered_extent->flags)) {
2842 logical_len = ordered_extent->truncated_len;
2843 /* Truncated the entire extent, don't bother adding */
2848 if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) {
2849 BUG_ON(!list_empty(&ordered_extent->list)); /* Logic error */
2852 * For mwrite(mmap + memset to write) case, we still reserve
2853 * space for NOCOW range.
2854 * As NOCOW won't cause a new delayed ref, just free the space
2856 btrfs_qgroup_free_data(inode, ordered_extent->file_offset,
2857 ordered_extent->len);
2858 btrfs_ordered_update_i_size(inode, 0, ordered_extent);
2860 trans = btrfs_join_transaction_nolock(root);
2862 trans = btrfs_join_transaction(root);
2863 if (IS_ERR(trans)) {
2864 ret = PTR_ERR(trans);
2868 trans->block_rsv = &root->fs_info->delalloc_block_rsv;
2869 ret = btrfs_update_inode_fallback(trans, root, inode);
2870 if (ret) /* -ENOMEM or corruption */
2871 btrfs_abort_transaction(trans, root, ret);
2875 lock_extent_bits(io_tree, ordered_extent->file_offset,
2876 ordered_extent->file_offset + ordered_extent->len - 1,
2879 ret = test_range_bit(io_tree, ordered_extent->file_offset,
2880 ordered_extent->file_offset + ordered_extent->len - 1,
2881 EXTENT_DEFRAG, 1, cached_state);
2883 u64 last_snapshot = btrfs_root_last_snapshot(&root->root_item);
2884 if (0 && last_snapshot >= BTRFS_I(inode)->generation)
2885 /* the inode is shared */
2886 new = record_old_file_extents(inode, ordered_extent);
2888 clear_extent_bit(io_tree, ordered_extent->file_offset,
2889 ordered_extent->file_offset + ordered_extent->len - 1,
2890 EXTENT_DEFRAG, 0, 0, &cached_state, GFP_NOFS);
2894 trans = btrfs_join_transaction_nolock(root);
2896 trans = btrfs_join_transaction(root);
2897 if (IS_ERR(trans)) {
2898 ret = PTR_ERR(trans);
2903 trans->block_rsv = &root->fs_info->delalloc_block_rsv;
2905 if (test_bit(BTRFS_ORDERED_COMPRESSED, &ordered_extent->flags))
2906 compress_type = ordered_extent->compress_type;
2907 if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) {
2908 BUG_ON(compress_type);
2909 ret = btrfs_mark_extent_written(trans, inode,
2910 ordered_extent->file_offset,
2911 ordered_extent->file_offset +
2914 BUG_ON(root == root->fs_info->tree_root);
2915 ret = insert_reserved_file_extent(trans, inode,
2916 ordered_extent->file_offset,
2917 ordered_extent->start,
2918 ordered_extent->disk_len,
2919 logical_len, logical_len,
2920 compress_type, 0, 0,
2921 BTRFS_FILE_EXTENT_REG);
2923 btrfs_release_delalloc_bytes(root,
2924 ordered_extent->start,
2925 ordered_extent->disk_len);
2927 unpin_extent_cache(&BTRFS_I(inode)->extent_tree,
2928 ordered_extent->file_offset, ordered_extent->len,
2931 btrfs_abort_transaction(trans, root, ret);
2935 add_pending_csums(trans, inode, ordered_extent->file_offset,
2936 &ordered_extent->list);
2938 btrfs_ordered_update_i_size(inode, 0, ordered_extent);
2939 ret = btrfs_update_inode_fallback(trans, root, inode);
2940 if (ret) { /* -ENOMEM or corruption */
2941 btrfs_abort_transaction(trans, root, ret);
2946 unlock_extent_cached(io_tree, ordered_extent->file_offset,
2947 ordered_extent->file_offset +
2948 ordered_extent->len - 1, &cached_state, GFP_NOFS);
2950 if (root != root->fs_info->tree_root)
2951 btrfs_delalloc_release_metadata(inode, ordered_extent->len);
2953 btrfs_end_transaction(trans, root);
2955 if (ret || truncated) {
2959 start = ordered_extent->file_offset + logical_len;
2961 start = ordered_extent->file_offset;
2962 end = ordered_extent->file_offset + ordered_extent->len - 1;
2963 clear_extent_uptodate(io_tree, start, end, NULL, GFP_NOFS);
2965 /* Drop the cache for the part of the extent we didn't write. */
2966 btrfs_drop_extent_cache(inode, start, end, 0);
2969 * If the ordered extent had an IOERR or something else went
2970 * wrong we need to return the space for this ordered extent
2971 * back to the allocator. We only free the extent in the
2972 * truncated case if we didn't write out the extent at all.
2974 if ((ret || !logical_len) &&
2975 !test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags) &&
2976 !test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags))
2977 btrfs_free_reserved_extent(root, ordered_extent->start,
2978 ordered_extent->disk_len, 1);
2983 * This needs to be done to make sure anybody waiting knows we are done
2984 * updating everything for this ordered extent.
2986 btrfs_remove_ordered_extent(inode, ordered_extent);
2988 /* for snapshot-aware defrag */
2991 free_sa_defrag_extent(new);
2992 atomic_dec(&root->fs_info->defrag_running);
2994 relink_file_extents(new);
2999 btrfs_put_ordered_extent(ordered_extent);
3000 /* once for the tree */
3001 btrfs_put_ordered_extent(ordered_extent);
3006 static void finish_ordered_fn(struct btrfs_work *work)
3008 struct btrfs_ordered_extent *ordered_extent;
3009 ordered_extent = container_of(work, struct btrfs_ordered_extent, work);
3010 btrfs_finish_ordered_io(ordered_extent);
3013 static int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end,
3014 struct extent_state *state, int uptodate)
3016 struct inode *inode = page->mapping->host;
3017 struct btrfs_root *root = BTRFS_I(inode)->root;
3018 struct btrfs_ordered_extent *ordered_extent = NULL;
3019 struct btrfs_workqueue *wq;
3020 btrfs_work_func_t func;
3022 trace_btrfs_writepage_end_io_hook(page, start, end, uptodate);
3024 ClearPagePrivate2(page);
3025 if (!btrfs_dec_test_ordered_pending(inode, &ordered_extent, start,
3026 end - start + 1, uptodate))
3029 if (btrfs_is_free_space_inode(inode)) {
3030 wq = root->fs_info->endio_freespace_worker;
3031 func = btrfs_freespace_write_helper;
3033 wq = root->fs_info->endio_write_workers;
3034 func = btrfs_endio_write_helper;
3037 btrfs_init_work(&ordered_extent->work, func, finish_ordered_fn, NULL,
3039 btrfs_queue_work(wq, &ordered_extent->work);
3044 static int __readpage_endio_check(struct inode *inode,
3045 struct btrfs_io_bio *io_bio,
3046 int icsum, struct page *page,
3047 int pgoff, u64 start, size_t len)
3053 csum_expected = *(((u32 *)io_bio->csum) + icsum);
3055 kaddr = kmap_atomic(page);
3056 csum = btrfs_csum_data(kaddr + pgoff, csum, len);
3057 btrfs_csum_final(csum, (char *)&csum);
3058 if (csum != csum_expected)
3061 kunmap_atomic(kaddr);
3064 btrfs_warn_rl(BTRFS_I(inode)->root->fs_info,
3065 "csum failed ino %llu off %llu csum %u expected csum %u",
3066 btrfs_ino(inode), start, csum, csum_expected);
3067 memset(kaddr + pgoff, 1, len);
3068 flush_dcache_page(page);
3069 kunmap_atomic(kaddr);
3070 if (csum_expected == 0)
3076 * when reads are done, we need to check csums to verify the data is correct
3077 * if there's a match, we allow the bio to finish. If not, the code in
3078 * extent_io.c will try to find good copies for us.
3080 static int btrfs_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
3081 u64 phy_offset, struct page *page,
3082 u64 start, u64 end, int mirror)
3084 size_t offset = start - page_offset(page);
3085 struct inode *inode = page->mapping->host;
3086 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
3087 struct btrfs_root *root = BTRFS_I(inode)->root;
3089 if (PageChecked(page)) {
3090 ClearPageChecked(page);
3094 if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)
3097 if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID &&
3098 test_range_bit(io_tree, start, end, EXTENT_NODATASUM, 1, NULL)) {
3099 clear_extent_bits(io_tree, start, end, EXTENT_NODATASUM,
3104 phy_offset >>= inode->i_sb->s_blocksize_bits;
3105 return __readpage_endio_check(inode, io_bio, phy_offset, page, offset,
3106 start, (size_t)(end - start + 1));
3109 struct delayed_iput {
3110 struct list_head list;
3111 struct inode *inode;
3114 /* JDM: If this is fs-wide, why can't we add a pointer to
3115 * btrfs_inode instead and avoid the allocation? */
3116 void btrfs_add_delayed_iput(struct inode *inode)
3118 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
3119 struct delayed_iput *delayed;
3121 if (atomic_add_unless(&inode->i_count, -1, 1))
3124 delayed = kmalloc(sizeof(*delayed), GFP_NOFS | __GFP_NOFAIL);
3125 delayed->inode = inode;
3127 spin_lock(&fs_info->delayed_iput_lock);
3128 list_add_tail(&delayed->list, &fs_info->delayed_iputs);
3129 spin_unlock(&fs_info->delayed_iput_lock);
3132 void btrfs_run_delayed_iputs(struct btrfs_root *root)
3135 struct btrfs_fs_info *fs_info = root->fs_info;
3136 struct delayed_iput *delayed;
3139 spin_lock(&fs_info->delayed_iput_lock);
3140 empty = list_empty(&fs_info->delayed_iputs);
3141 spin_unlock(&fs_info->delayed_iput_lock);
3145 spin_lock(&fs_info->delayed_iput_lock);
3146 list_splice_init(&fs_info->delayed_iputs, &list);
3147 spin_unlock(&fs_info->delayed_iput_lock);
3149 while (!list_empty(&list)) {
3150 delayed = list_entry(list.next, struct delayed_iput, list);
3151 list_del(&delayed->list);
3152 iput(delayed->inode);
3158 * This is called in transaction commit time. If there are no orphan
3159 * files in the subvolume, it removes orphan item and frees block_rsv
3162 void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
3163 struct btrfs_root *root)
3165 struct btrfs_block_rsv *block_rsv;
3168 if (atomic_read(&root->orphan_inodes) ||
3169 root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE)
3172 spin_lock(&root->orphan_lock);
3173 if (atomic_read(&root->orphan_inodes)) {
3174 spin_unlock(&root->orphan_lock);
3178 if (root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) {
3179 spin_unlock(&root->orphan_lock);
3183 block_rsv = root->orphan_block_rsv;
3184 root->orphan_block_rsv = NULL;
3185 spin_unlock(&root->orphan_lock);
3187 if (test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state) &&
3188 btrfs_root_refs(&root->root_item) > 0) {
3189 ret = btrfs_del_orphan_item(trans, root->fs_info->tree_root,
3190 root->root_key.objectid);
3192 btrfs_abort_transaction(trans, root, ret);
3194 clear_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED,
3199 WARN_ON(block_rsv->size > 0);
3200 btrfs_free_block_rsv(root, block_rsv);
3205 * This creates an orphan entry for the given inode in case something goes
3206 * wrong in the middle of an unlink/truncate.
3208 * NOTE: caller of this function should reserve 5 units of metadata for
3211 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode)
3213 struct btrfs_root *root = BTRFS_I(inode)->root;
3214 struct btrfs_block_rsv *block_rsv = NULL;
3219 if (!root->orphan_block_rsv) {
3220 block_rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP);
3225 spin_lock(&root->orphan_lock);
3226 if (!root->orphan_block_rsv) {
3227 root->orphan_block_rsv = block_rsv;
3228 } else if (block_rsv) {
3229 btrfs_free_block_rsv(root, block_rsv);
3233 if (!test_and_set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM,
3234 &BTRFS_I(inode)->runtime_flags)) {
3237 * For proper ENOSPC handling, we should do orphan
3238 * cleanup when mounting. But this introduces backward
3239 * compatibility issue.
3241 if (!xchg(&root->orphan_item_inserted, 1))
3247 atomic_inc(&root->orphan_inodes);
3250 if (!test_and_set_bit(BTRFS_INODE_ORPHAN_META_RESERVED,
3251 &BTRFS_I(inode)->runtime_flags))
3253 spin_unlock(&root->orphan_lock);
3255 /* grab metadata reservation from transaction handle */
3257 ret = btrfs_orphan_reserve_metadata(trans, inode);
3258 BUG_ON(ret); /* -ENOSPC in reservation; Logic error? JDM */
3261 /* insert an orphan item to track this unlinked/truncated file */
3263 ret = btrfs_insert_orphan_item(trans, root, btrfs_ino(inode));
3265 atomic_dec(&root->orphan_inodes);
3267 clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED,
3268 &BTRFS_I(inode)->runtime_flags);
3269 btrfs_orphan_release_metadata(inode);
3271 if (ret != -EEXIST) {
3272 clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM,
3273 &BTRFS_I(inode)->runtime_flags);
3274 btrfs_abort_transaction(trans, root, ret);
3281 /* insert an orphan item to track subvolume contains orphan files */
3283 ret = btrfs_insert_orphan_item(trans, root->fs_info->tree_root,
3284 root->root_key.objectid);
3285 if (ret && ret != -EEXIST) {
3286 btrfs_abort_transaction(trans, root, ret);
3294 * We have done the truncate/delete so we can go ahead and remove the orphan
3295 * item for this particular inode.
3297 static int btrfs_orphan_del(struct btrfs_trans_handle *trans,
3298 struct inode *inode)
3300 struct btrfs_root *root = BTRFS_I(inode)->root;
3301 int delete_item = 0;
3302 int release_rsv = 0;
3305 spin_lock(&root->orphan_lock);
3306 if (test_and_clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM,
3307 &BTRFS_I(inode)->runtime_flags))
3310 if (test_and_clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED,
3311 &BTRFS_I(inode)->runtime_flags))
3313 spin_unlock(&root->orphan_lock);
3316 atomic_dec(&root->orphan_inodes);
3318 ret = btrfs_del_orphan_item(trans, root,
3323 btrfs_orphan_release_metadata(inode);
3329 * this cleans up any orphans that may be left on the list from the last use
3332 int btrfs_orphan_cleanup(struct btrfs_root *root)
3334 struct btrfs_path *path;
3335 struct extent_buffer *leaf;
3336 struct btrfs_key key, found_key;
3337 struct btrfs_trans_handle *trans;
3338 struct inode *inode;
3339 u64 last_objectid = 0;
3340 int ret = 0, nr_unlink = 0, nr_truncate = 0;
3342 if (cmpxchg(&root->orphan_cleanup_state, 0, ORPHAN_CLEANUP_STARTED))
3345 path = btrfs_alloc_path();
3352 key.objectid = BTRFS_ORPHAN_OBJECTID;
3353 key.type = BTRFS_ORPHAN_ITEM_KEY;
3354 key.offset = (u64)-1;
3357 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3362 * if ret == 0 means we found what we were searching for, which
3363 * is weird, but possible, so only screw with path if we didn't
3364 * find the key and see if we have stuff that matches
3368 if (path->slots[0] == 0)
3373 /* pull out the item */
3374 leaf = path->nodes[0];
3375 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
3377 /* make sure the item matches what we want */
3378 if (found_key.objectid != BTRFS_ORPHAN_OBJECTID)
3380 if (found_key.type != BTRFS_ORPHAN_ITEM_KEY)
3383 /* release the path since we're done with it */
3384 btrfs_release_path(path);
3387 * this is where we are basically btrfs_lookup, without the
3388 * crossing root thing. we store the inode number in the
3389 * offset of the orphan item.
3392 if (found_key.offset == last_objectid) {
3393 btrfs_err(root->fs_info,
3394 "Error removing orphan entry, stopping orphan cleanup");
3399 last_objectid = found_key.offset;
3401 found_key.objectid = found_key.offset;
3402 found_key.type = BTRFS_INODE_ITEM_KEY;
3403 found_key.offset = 0;
3404 inode = btrfs_iget(root->fs_info->sb, &found_key, root, NULL);
3405 ret = PTR_ERR_OR_ZERO(inode);
3406 if (ret && ret != -ESTALE)
3409 if (ret == -ESTALE && root == root->fs_info->tree_root) {
3410 struct btrfs_root *dead_root;
3411 struct btrfs_fs_info *fs_info = root->fs_info;
3412 int is_dead_root = 0;
3415 * this is an orphan in the tree root. Currently these
3416 * could come from 2 sources:
3417 * a) a snapshot deletion in progress
3418 * b) a free space cache inode
3419 * We need to distinguish those two, as the snapshot
3420 * orphan must not get deleted.
3421 * find_dead_roots already ran before us, so if this
3422 * is a snapshot deletion, we should find the root
3423 * in the dead_roots list
3425 spin_lock(&fs_info->trans_lock);
3426 list_for_each_entry(dead_root, &fs_info->dead_roots,
3428 if (dead_root->root_key.objectid ==
3429 found_key.objectid) {
3434 spin_unlock(&fs_info->trans_lock);
3436 /* prevent this orphan from being found again */
3437 key.offset = found_key.objectid - 1;
3442 * Inode is already gone but the orphan item is still there,
3443 * kill the orphan item.
3445 if (ret == -ESTALE) {
3446 trans = btrfs_start_transaction(root, 1);
3447 if (IS_ERR(trans)) {
3448 ret = PTR_ERR(trans);
3451 btrfs_debug(root->fs_info, "auto deleting %Lu",
3452 found_key.objectid);
3453 ret = btrfs_del_orphan_item(trans, root,
3454 found_key.objectid);
3455 btrfs_end_transaction(trans, root);
3462 * add this inode to the orphan list so btrfs_orphan_del does
3463 * the proper thing when we hit it
3465 set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM,
3466 &BTRFS_I(inode)->runtime_flags);
3467 atomic_inc(&root->orphan_inodes);
3469 /* if we have links, this was a truncate, lets do that */
3470 if (inode->i_nlink) {
3471 if (WARN_ON(!S_ISREG(inode->i_mode))) {
3477 /* 1 for the orphan item deletion. */
3478 trans = btrfs_start_transaction(root, 1);
3479 if (IS_ERR(trans)) {
3481 ret = PTR_ERR(trans);
3484 ret = btrfs_orphan_add(trans, inode);
3485 btrfs_end_transaction(trans, root);
3491 ret = btrfs_truncate(inode);
3493 btrfs_orphan_del(NULL, inode);
3498 /* this will do delete_inode and everything for us */
3503 /* release the path since we're done with it */
3504 btrfs_release_path(path);
3506 root->orphan_cleanup_state = ORPHAN_CLEANUP_DONE;
3508 if (root->orphan_block_rsv)
3509 btrfs_block_rsv_release(root, root->orphan_block_rsv,
3512 if (root->orphan_block_rsv ||
3513 test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state)) {
3514 trans = btrfs_join_transaction(root);
3516 btrfs_end_transaction(trans, root);
3520 btrfs_debug(root->fs_info, "unlinked %d orphans", nr_unlink);
3522 btrfs_debug(root->fs_info, "truncated %d orphans", nr_truncate);
3526 btrfs_err(root->fs_info,
3527 "could not do orphan cleanup %d", ret);
3528 btrfs_free_path(path);
3533 * very simple check to peek ahead in the leaf looking for xattrs. If we
3534 * don't find any xattrs, we know there can't be any acls.
3536 * slot is the slot the inode is in, objectid is the objectid of the inode
3538 static noinline int acls_after_inode_item(struct extent_buffer *leaf,
3539 int slot, u64 objectid,
3540 int *first_xattr_slot)
3542 u32 nritems = btrfs_header_nritems(leaf);
3543 struct btrfs_key found_key;
3544 static u64 xattr_access = 0;
3545 static u64 xattr_default = 0;
3548 if (!xattr_access) {
3549 xattr_access = btrfs_name_hash(POSIX_ACL_XATTR_ACCESS,
3550 strlen(POSIX_ACL_XATTR_ACCESS));
3551 xattr_default = btrfs_name_hash(POSIX_ACL_XATTR_DEFAULT,
3552 strlen(POSIX_ACL_XATTR_DEFAULT));
3556 *first_xattr_slot = -1;
3557 while (slot < nritems) {
3558 btrfs_item_key_to_cpu(leaf, &found_key, slot);
3560 /* we found a different objectid, there must not be acls */
3561 if (found_key.objectid != objectid)
3564 /* we found an xattr, assume we've got an acl */
3565 if (found_key.type == BTRFS_XATTR_ITEM_KEY) {
3566 if (*first_xattr_slot == -1)
3567 *first_xattr_slot = slot;
3568 if (found_key.offset == xattr_access ||
3569 found_key.offset == xattr_default)
3574 * we found a key greater than an xattr key, there can't
3575 * be any acls later on
3577 if (found_key.type > BTRFS_XATTR_ITEM_KEY)
3584 * it goes inode, inode backrefs, xattrs, extents,
3585 * so if there are a ton of hard links to an inode there can
3586 * be a lot of backrefs. Don't waste time searching too hard,
3587 * this is just an optimization
3592 /* we hit the end of the leaf before we found an xattr or
3593 * something larger than an xattr. We have to assume the inode
3596 if (*first_xattr_slot == -1)
3597 *first_xattr_slot = slot;
3602 * read an inode from the btree into the in-memory inode
3604 static void btrfs_read_locked_inode(struct inode *inode)
3606 struct btrfs_path *path;
3607 struct extent_buffer *leaf;
3608 struct btrfs_inode_item *inode_item;
3609 struct btrfs_root *root = BTRFS_I(inode)->root;
3610 struct btrfs_key location;
3615 bool filled = false;
3616 int first_xattr_slot;
3618 ret = btrfs_fill_inode(inode, &rdev);
3622 path = btrfs_alloc_path();
3626 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
3628 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
3632 leaf = path->nodes[0];
3637 inode_item = btrfs_item_ptr(leaf, path->slots[0],
3638 struct btrfs_inode_item);
3639 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
3640 set_nlink(inode, btrfs_inode_nlink(leaf, inode_item));
3641 i_uid_write(inode, btrfs_inode_uid(leaf, inode_item));
3642 i_gid_write(inode, btrfs_inode_gid(leaf, inode_item));
3643 btrfs_i_size_write(inode, btrfs_inode_size(leaf, inode_item));
3645 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->atime);
3646 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->atime);
3648 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->mtime);
3649 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->mtime);
3651 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->ctime);
3652 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->ctime);
3654 BTRFS_I(inode)->i_otime.tv_sec =
3655 btrfs_timespec_sec(leaf, &inode_item->otime);
3656 BTRFS_I(inode)->i_otime.tv_nsec =
3657 btrfs_timespec_nsec(leaf, &inode_item->otime);
3659 inode_set_bytes(inode, btrfs_inode_nbytes(leaf, inode_item));
3660 BTRFS_I(inode)->generation = btrfs_inode_generation(leaf, inode_item);
3661 BTRFS_I(inode)->last_trans = btrfs_inode_transid(leaf, inode_item);
3663 inode->i_version = btrfs_inode_sequence(leaf, inode_item);
3664 inode->i_generation = BTRFS_I(inode)->generation;
3666 rdev = btrfs_inode_rdev(leaf, inode_item);
3668 BTRFS_I(inode)->index_cnt = (u64)-1;
3669 BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
3673 * If we were modified in the current generation and evicted from memory
3674 * and then re-read we need to do a full sync since we don't have any
3675 * idea about which extents were modified before we were evicted from
3678 * This is required for both inode re-read from disk and delayed inode
3679 * in delayed_nodes_tree.
3681 if (BTRFS_I(inode)->last_trans == root->fs_info->generation)
3682 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3683 &BTRFS_I(inode)->runtime_flags);
3686 * We don't persist the id of the transaction where an unlink operation
3687 * against the inode was last made. So here we assume the inode might
3688 * have been evicted, and therefore the exact value of last_unlink_trans
3689 * lost, and set it to last_trans to avoid metadata inconsistencies
3690 * between the inode and its parent if the inode is fsync'ed and the log
3691 * replayed. For example, in the scenario:
3694 * ln mydir/foo mydir/bar
3697 * echo 2 > /proc/sys/vm/drop_caches # evicts inode
3698 * xfs_io -c fsync mydir/foo
3700 * mount fs, triggers fsync log replay
3702 * We must make sure that when we fsync our inode foo we also log its
3703 * parent inode, otherwise after log replay the parent still has the
3704 * dentry with the "bar" name but our inode foo has a link count of 1
3705 * and doesn't have an inode ref with the name "bar" anymore.
3707 * Setting last_unlink_trans to last_trans is a pessimistic approach,
3708 * but it guarantees correctness at the expense of ocassional full
3709 * transaction commits on fsync if our inode is a directory, or if our
3710 * inode is not a directory, logging its parent unnecessarily.
3712 BTRFS_I(inode)->last_unlink_trans = BTRFS_I(inode)->last_trans;
3715 if (inode->i_nlink != 1 ||
3716 path->slots[0] >= btrfs_header_nritems(leaf))
3719 btrfs_item_key_to_cpu(leaf, &location, path->slots[0]);
3720 if (location.objectid != btrfs_ino(inode))
3723 ptr = btrfs_item_ptr_offset(leaf, path->slots[0]);
3724 if (location.type == BTRFS_INODE_REF_KEY) {
3725 struct btrfs_inode_ref *ref;
3727 ref = (struct btrfs_inode_ref *)ptr;
3728 BTRFS_I(inode)->dir_index = btrfs_inode_ref_index(leaf, ref);
3729 } else if (location.type == BTRFS_INODE_EXTREF_KEY) {
3730 struct btrfs_inode_extref *extref;
3732 extref = (struct btrfs_inode_extref *)ptr;
3733 BTRFS_I(inode)->dir_index = btrfs_inode_extref_index(leaf,
3738 * try to precache a NULL acl entry for files that don't have
3739 * any xattrs or acls
3741 maybe_acls = acls_after_inode_item(leaf, path->slots[0],
3742 btrfs_ino(inode), &first_xattr_slot);
3743 if (first_xattr_slot != -1) {
3744 path->slots[0] = first_xattr_slot;
3745 ret = btrfs_load_inode_props(inode, path);
3747 btrfs_err(root->fs_info,
3748 "error loading props for ino %llu (root %llu): %d",
3750 root->root_key.objectid, ret);
3752 btrfs_free_path(path);
3755 cache_no_acl(inode);
3757 switch (inode->i_mode & S_IFMT) {
3759 inode->i_mapping->a_ops = &btrfs_aops;
3760 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
3761 inode->i_fop = &btrfs_file_operations;
3762 inode->i_op = &btrfs_file_inode_operations;
3765 inode->i_fop = &btrfs_dir_file_operations;
3766 if (root == root->fs_info->tree_root)
3767 inode->i_op = &btrfs_dir_ro_inode_operations;
3769 inode->i_op = &btrfs_dir_inode_operations;
3772 inode->i_op = &btrfs_symlink_inode_operations;
3773 inode->i_mapping->a_ops = &btrfs_symlink_aops;
3776 inode->i_op = &btrfs_special_inode_operations;
3777 init_special_inode(inode, inode->i_mode, rdev);
3781 btrfs_update_iflags(inode);
3785 btrfs_free_path(path);
3786 make_bad_inode(inode);
3790 * given a leaf and an inode, copy the inode fields into the leaf
3792 static void fill_inode_item(struct btrfs_trans_handle *trans,
3793 struct extent_buffer *leaf,
3794 struct btrfs_inode_item *item,
3795 struct inode *inode)
3797 struct btrfs_map_token token;
3799 btrfs_init_map_token(&token);
3801 btrfs_set_token_inode_uid(leaf, item, i_uid_read(inode), &token);
3802 btrfs_set_token_inode_gid(leaf, item, i_gid_read(inode), &token);
3803 btrfs_set_token_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size,
3805 btrfs_set_token_inode_mode(leaf, item, inode->i_mode, &token);
3806 btrfs_set_token_inode_nlink(leaf, item, inode->i_nlink, &token);
3808 btrfs_set_token_timespec_sec(leaf, &item->atime,
3809 inode->i_atime.tv_sec, &token);
3810 btrfs_set_token_timespec_nsec(leaf, &item->atime,
3811 inode->i_atime.tv_nsec, &token);
3813 btrfs_set_token_timespec_sec(leaf, &item->mtime,
3814 inode->i_mtime.tv_sec, &token);
3815 btrfs_set_token_timespec_nsec(leaf, &item->mtime,
3816 inode->i_mtime.tv_nsec, &token);
3818 btrfs_set_token_timespec_sec(leaf, &item->ctime,
3819 inode->i_ctime.tv_sec, &token);
3820 btrfs_set_token_timespec_nsec(leaf, &item->ctime,
3821 inode->i_ctime.tv_nsec, &token);
3823 btrfs_set_token_timespec_sec(leaf, &item->otime,
3824 BTRFS_I(inode)->i_otime.tv_sec, &token);
3825 btrfs_set_token_timespec_nsec(leaf, &item->otime,
3826 BTRFS_I(inode)->i_otime.tv_nsec, &token);
3828 btrfs_set_token_inode_nbytes(leaf, item, inode_get_bytes(inode),
3830 btrfs_set_token_inode_generation(leaf, item, BTRFS_I(inode)->generation,
3832 btrfs_set_token_inode_sequence(leaf, item, inode->i_version, &token);
3833 btrfs_set_token_inode_transid(leaf, item, trans->transid, &token);
3834 btrfs_set_token_inode_rdev(leaf, item, inode->i_rdev, &token);
3835 btrfs_set_token_inode_flags(leaf, item, BTRFS_I(inode)->flags, &token);
3836 btrfs_set_token_inode_block_group(leaf, item, 0, &token);
3840 * copy everything in the in-memory inode into the btree.
3842 static noinline int btrfs_update_inode_item(struct btrfs_trans_handle *trans,
3843 struct btrfs_root *root, struct inode *inode)
3845 struct btrfs_inode_item *inode_item;
3846 struct btrfs_path *path;
3847 struct extent_buffer *leaf;
3850 path = btrfs_alloc_path();
3854 path->leave_spinning = 1;
3855 ret = btrfs_lookup_inode(trans, root, path, &BTRFS_I(inode)->location,
3863 leaf = path->nodes[0];
3864 inode_item = btrfs_item_ptr(leaf, path->slots[0],
3865 struct btrfs_inode_item);
3867 fill_inode_item(trans, leaf, inode_item, inode);
3868 btrfs_mark_buffer_dirty(leaf);
3869 btrfs_set_inode_last_trans(trans, inode);
3872 btrfs_free_path(path);
3877 * copy everything in the in-memory inode into the btree.
3879 noinline int btrfs_update_inode(struct btrfs_trans_handle *trans,
3880 struct btrfs_root *root, struct inode *inode)
3885 * If the inode is a free space inode, we can deadlock during commit
3886 * if we put it into the delayed code.
3888 * The data relocation inode should also be directly updated
3891 if (!btrfs_is_free_space_inode(inode)
3892 && root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID
3893 && !root->fs_info->log_root_recovering) {
3894 btrfs_update_root_times(trans, root);
3896 ret = btrfs_delayed_update_inode(trans, root, inode);
3898 btrfs_set_inode_last_trans(trans, inode);
3902 return btrfs_update_inode_item(trans, root, inode);
3905 noinline int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3906 struct btrfs_root *root,
3907 struct inode *inode)
3911 ret = btrfs_update_inode(trans, root, inode);
3913 return btrfs_update_inode_item(trans, root, inode);
3918 * unlink helper that gets used here in inode.c and in the tree logging
3919 * recovery code. It remove a link in a directory with a given name, and
3920 * also drops the back refs in the inode to the directory
3922 static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3923 struct btrfs_root *root,
3924 struct inode *dir, struct inode *inode,
3925 const char *name, int name_len)
3927 struct btrfs_path *path;
3929 struct extent_buffer *leaf;
3930 struct btrfs_dir_item *di;
3931 struct btrfs_key key;
3933 u64 ino = btrfs_ino(inode);
3934 u64 dir_ino = btrfs_ino(dir);
3936 path = btrfs_alloc_path();
3942 path->leave_spinning = 1;
3943 di = btrfs_lookup_dir_item(trans, root, path, dir_ino,
3944 name, name_len, -1);
3953 leaf = path->nodes[0];
3954 btrfs_dir_item_key_to_cpu(leaf, di, &key);
3955 ret = btrfs_delete_one_dir_name(trans, root, path, di);
3958 btrfs_release_path(path);
3961 * If we don't have dir index, we have to get it by looking up
3962 * the inode ref, since we get the inode ref, remove it directly,
3963 * it is unnecessary to do delayed deletion.
3965 * But if we have dir index, needn't search inode ref to get it.
3966 * Since the inode ref is close to the inode item, it is better
3967 * that we delay to delete it, and just do this deletion when
3968 * we update the inode item.
3970 if (BTRFS_I(inode)->dir_index) {
3971 ret = btrfs_delayed_delete_inode_ref(inode);
3973 index = BTRFS_I(inode)->dir_index;
3978 ret = btrfs_del_inode_ref(trans, root, name, name_len, ino,
3981 btrfs_info(root->fs_info,
3982 "failed to delete reference to %.*s, inode %llu parent %llu",
3983 name_len, name, ino, dir_ino);
3984 btrfs_abort_transaction(trans, root, ret);
3988 ret = btrfs_delete_delayed_dir_index(trans, root, dir, index);
3990 btrfs_abort_transaction(trans, root, ret);
3994 ret = btrfs_del_inode_ref_in_log(trans, root, name, name_len,
3996 if (ret != 0 && ret != -ENOENT) {
3997 btrfs_abort_transaction(trans, root, ret);
4001 ret = btrfs_del_dir_entries_in_log(trans, root, name, name_len,
4006 btrfs_abort_transaction(trans, root, ret);
4008 btrfs_free_path(path);
4012 btrfs_i_size_write(dir, dir->i_size - name_len * 2);
4013 inode_inc_iversion(inode);
4014 inode_inc_iversion(dir);
4015 inode->i_ctime = dir->i_mtime = dir->i_ctime = CURRENT_TIME;
4016 ret = btrfs_update_inode(trans, root, dir);
4021 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
4022 struct btrfs_root *root,
4023 struct inode *dir, struct inode *inode,
4024 const char *name, int name_len)
4027 ret = __btrfs_unlink_inode(trans, root, dir, inode, name, name_len);
4030 ret = btrfs_update_inode(trans, root, inode);
4036 * helper to start transaction for unlink and rmdir.
4038 * unlink and rmdir are special in btrfs, they do not always free space, so
4039 * if we cannot make our reservations the normal way try and see if there is
4040 * plenty of slack room in the global reserve to migrate, otherwise we cannot
4041 * allow the unlink to occur.
4043 static struct btrfs_trans_handle *__unlink_start_trans(struct inode *dir)
4045 struct btrfs_root *root = BTRFS_I(dir)->root;
4048 * 1 for the possible orphan item
4049 * 1 for the dir item
4050 * 1 for the dir index
4051 * 1 for the inode ref
4054 return btrfs_start_transaction_fallback_global_rsv(root, 5, 5);
4057 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
4059 struct btrfs_root *root = BTRFS_I(dir)->root;
4060 struct btrfs_trans_handle *trans;
4061 struct inode *inode = d_inode(dentry);
4064 trans = __unlink_start_trans(dir);
4066 return PTR_ERR(trans);
4068 btrfs_record_unlink_dir(trans, dir, d_inode(dentry), 0);
4070 ret = btrfs_unlink_inode(trans, root, dir, d_inode(dentry),
4071 dentry->d_name.name, dentry->d_name.len);
4075 if (inode->i_nlink == 0) {
4076 ret = btrfs_orphan_add(trans, inode);
4082 btrfs_end_transaction(trans, root);
4083 btrfs_btree_balance_dirty(root);
4087 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
4088 struct btrfs_root *root,
4089 struct inode *dir, u64 objectid,
4090 const char *name, int name_len)
4092 struct btrfs_path *path;
4093 struct extent_buffer *leaf;
4094 struct btrfs_dir_item *di;
4095 struct btrfs_key key;
4098 u64 dir_ino = btrfs_ino(dir);
4100 path = btrfs_alloc_path();
4104 di = btrfs_lookup_dir_item(trans, root, path, dir_ino,
4105 name, name_len, -1);
4106 if (IS_ERR_OR_NULL(di)) {
4114 leaf = path->nodes[0];
4115 btrfs_dir_item_key_to_cpu(leaf, di, &key);
4116 WARN_ON(key.type != BTRFS_ROOT_ITEM_KEY || key.objectid != objectid);
4117 ret = btrfs_delete_one_dir_name(trans, root, path, di);
4119 btrfs_abort_transaction(trans, root, ret);
4122 btrfs_release_path(path);
4124 ret = btrfs_del_root_ref(trans, root->fs_info->tree_root,
4125 objectid, root->root_key.objectid,
4126 dir_ino, &index, name, name_len);
4128 if (ret != -ENOENT) {
4129 btrfs_abort_transaction(trans, root, ret);
4132 di = btrfs_search_dir_index_item(root, path, dir_ino,
4134 if (IS_ERR_OR_NULL(di)) {
4139 btrfs_abort_transaction(trans, root, ret);
4143 leaf = path->nodes[0];
4144 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
4145 btrfs_release_path(path);
4148 btrfs_release_path(path);
4150 ret = btrfs_delete_delayed_dir_index(trans, root, dir, index);
4152 btrfs_abort_transaction(trans, root, ret);
4156 btrfs_i_size_write(dir, dir->i_size - name_len * 2);
4157 inode_inc_iversion(dir);
4158 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
4159 ret = btrfs_update_inode_fallback(trans, root, dir);
4161 btrfs_abort_transaction(trans, root, ret);
4163 btrfs_free_path(path);
4167 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
4169 struct inode *inode = d_inode(dentry);
4171 struct btrfs_root *root = BTRFS_I(dir)->root;
4172 struct btrfs_trans_handle *trans;
4174 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
4176 if (btrfs_ino(inode) == BTRFS_FIRST_FREE_OBJECTID)
4179 trans = __unlink_start_trans(dir);
4181 return PTR_ERR(trans);
4183 if (unlikely(btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) {
4184 err = btrfs_unlink_subvol(trans, root, dir,
4185 BTRFS_I(inode)->location.objectid,
4186 dentry->d_name.name,
4187 dentry->d_name.len);
4191 err = btrfs_orphan_add(trans, inode);
4195 /* now the directory is empty */
4196 err = btrfs_unlink_inode(trans, root, dir, d_inode(dentry),
4197 dentry->d_name.name, dentry->d_name.len);
4199 btrfs_i_size_write(inode, 0);
4201 btrfs_end_transaction(trans, root);
4202 btrfs_btree_balance_dirty(root);
4207 static int truncate_space_check(struct btrfs_trans_handle *trans,
4208 struct btrfs_root *root,
4213 bytes_deleted = btrfs_csum_bytes_to_leaves(root, bytes_deleted);
4214 ret = btrfs_block_rsv_add(root, &root->fs_info->trans_block_rsv,
4215 bytes_deleted, BTRFS_RESERVE_NO_FLUSH);
4217 trans->bytes_reserved += bytes_deleted;
4222 static int truncate_inline_extent(struct inode *inode,
4223 struct btrfs_path *path,
4224 struct btrfs_key *found_key,
4228 struct extent_buffer *leaf = path->nodes[0];
4229 int slot = path->slots[0];
4230 struct btrfs_file_extent_item *fi;
4231 u32 size = (u32)(new_size - found_key->offset);
4232 struct btrfs_root *root = BTRFS_I(inode)->root;
4234 fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
4236 if (btrfs_file_extent_compression(leaf, fi) != BTRFS_COMPRESS_NONE) {
4237 loff_t offset = new_size;
4238 loff_t page_end = ALIGN(offset, PAGE_CACHE_SIZE);
4241 * Zero out the remaining of the last page of our inline extent,
4242 * instead of directly truncating our inline extent here - that
4243 * would be much more complex (decompressing all the data, then
4244 * compressing the truncated data, which might be bigger than
4245 * the size of the inline extent, resize the extent, etc).
4246 * We release the path because to get the page we might need to
4247 * read the extent item from disk (data not in the page cache).
4249 btrfs_release_path(path);
4250 return btrfs_truncate_page(inode, offset, page_end - offset, 0);
4253 btrfs_set_file_extent_ram_bytes(leaf, fi, size);
4254 size = btrfs_file_extent_calc_inline_size(size);
4255 btrfs_truncate_item(root, path, size, 1);
4257 if (test_bit(BTRFS_ROOT_REF_COWS, &root->state))
4258 inode_sub_bytes(inode, item_end + 1 - new_size);
4264 * this can truncate away extent items, csum items and directory items.
4265 * It starts at a high offset and removes keys until it can't find
4266 * any higher than new_size
4268 * csum items that cross the new i_size are truncated to the new size
4271 * min_type is the minimum key type to truncate down to. If set to 0, this
4272 * will kill all the items on this inode, including the INODE_ITEM_KEY.
4274 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
4275 struct btrfs_root *root,
4276 struct inode *inode,
4277 u64 new_size, u32 min_type)
4279 struct btrfs_path *path;
4280 struct extent_buffer *leaf;
4281 struct btrfs_file_extent_item *fi;
4282 struct btrfs_key key;
4283 struct btrfs_key found_key;
4284 u64 extent_start = 0;
4285 u64 extent_num_bytes = 0;
4286 u64 extent_offset = 0;
4288 u64 last_size = new_size;
4289 u32 found_type = (u8)-1;
4292 int pending_del_nr = 0;
4293 int pending_del_slot = 0;
4294 int extent_type = -1;
4297 u64 ino = btrfs_ino(inode);
4298 u64 bytes_deleted = 0;
4300 bool should_throttle = 0;
4301 bool should_end = 0;
4303 BUG_ON(new_size > 0 && min_type != BTRFS_EXTENT_DATA_KEY);
4306 * for non-free space inodes and ref cows, we want to back off from
4309 if (!btrfs_is_free_space_inode(inode) &&
4310 test_bit(BTRFS_ROOT_REF_COWS, &root->state))
4313 path = btrfs_alloc_path();
4319 * We want to drop from the next block forward in case this new size is
4320 * not block aligned since we will be keeping the last block of the
4321 * extent just the way it is.
4323 if (test_bit(BTRFS_ROOT_REF_COWS, &root->state) ||
4324 root == root->fs_info->tree_root)
4325 btrfs_drop_extent_cache(inode, ALIGN(new_size,
4326 root->sectorsize), (u64)-1, 0);
4329 * This function is also used to drop the items in the log tree before
4330 * we relog the inode, so if root != BTRFS_I(inode)->root, it means
4331 * it is used to drop the loged items. So we shouldn't kill the delayed
4334 if (min_type == 0 && root == BTRFS_I(inode)->root)
4335 btrfs_kill_delayed_inode_items(inode);
4338 key.offset = (u64)-1;
4343 * with a 16K leaf size and 128MB extents, you can actually queue
4344 * up a huge file in a single leaf. Most of the time that
4345 * bytes_deleted is > 0, it will be huge by the time we get here
4347 if (be_nice && bytes_deleted > 32 * 1024 * 1024) {
4348 if (btrfs_should_end_transaction(trans, root)) {
4355 path->leave_spinning = 1;
4356 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
4363 /* there are no items in the tree for us to truncate, we're
4366 if (path->slots[0] == 0)
4373 leaf = path->nodes[0];
4374 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
4375 found_type = found_key.type;
4377 if (found_key.objectid != ino)
4380 if (found_type < min_type)
4383 item_end = found_key.offset;
4384 if (found_type == BTRFS_EXTENT_DATA_KEY) {
4385 fi = btrfs_item_ptr(leaf, path->slots[0],
4386 struct btrfs_file_extent_item);
4387 extent_type = btrfs_file_extent_type(leaf, fi);
4388 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
4390 btrfs_file_extent_num_bytes(leaf, fi);
4391 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
4392 item_end += btrfs_file_extent_inline_len(leaf,
4393 path->slots[0], fi);
4397 if (found_type > min_type) {
4400 if (item_end < new_size)
4402 if (found_key.offset >= new_size)
4408 /* FIXME, shrink the extent if the ref count is only 1 */
4409 if (found_type != BTRFS_EXTENT_DATA_KEY)
4413 last_size = found_key.offset;
4415 last_size = new_size;
4417 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
4419 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
4421 u64 orig_num_bytes =
4422 btrfs_file_extent_num_bytes(leaf, fi);
4423 extent_num_bytes = ALIGN(new_size -
4426 btrfs_set_file_extent_num_bytes(leaf, fi,
4428 num_dec = (orig_num_bytes -
4430 if (test_bit(BTRFS_ROOT_REF_COWS,
4433 inode_sub_bytes(inode, num_dec);
4434 btrfs_mark_buffer_dirty(leaf);
4437 btrfs_file_extent_disk_num_bytes(leaf,
4439 extent_offset = found_key.offset -
4440 btrfs_file_extent_offset(leaf, fi);
4442 /* FIXME blocksize != 4096 */
4443 num_dec = btrfs_file_extent_num_bytes(leaf, fi);
4444 if (extent_start != 0) {
4446 if (test_bit(BTRFS_ROOT_REF_COWS,
4448 inode_sub_bytes(inode, num_dec);
4451 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
4453 * we can't truncate inline items that have had
4457 btrfs_file_extent_encryption(leaf, fi) == 0 &&
4458 btrfs_file_extent_other_encoding(leaf, fi) == 0) {
4461 * Need to release path in order to truncate a
4462 * compressed extent. So delete any accumulated
4463 * extent items so far.
4465 if (btrfs_file_extent_compression(leaf, fi) !=
4466 BTRFS_COMPRESS_NONE && pending_del_nr) {
4467 err = btrfs_del_items(trans, root, path,
4471 btrfs_abort_transaction(trans,
4479 err = truncate_inline_extent(inode, path,
4484 btrfs_abort_transaction(trans,
4488 } else if (test_bit(BTRFS_ROOT_REF_COWS,
4490 inode_sub_bytes(inode, item_end + 1 - new_size);
4495 if (!pending_del_nr) {
4496 /* no pending yet, add ourselves */
4497 pending_del_slot = path->slots[0];
4499 } else if (pending_del_nr &&
4500 path->slots[0] + 1 == pending_del_slot) {
4501 /* hop on the pending chunk */
4503 pending_del_slot = path->slots[0];
4510 should_throttle = 0;
4513 (test_bit(BTRFS_ROOT_REF_COWS, &root->state) ||
4514 root == root->fs_info->tree_root)) {
4515 btrfs_set_path_blocking(path);
4516 bytes_deleted += extent_num_bytes;
4517 ret = btrfs_free_extent(trans, root, extent_start,
4518 extent_num_bytes, 0,
4519 btrfs_header_owner(leaf),
4520 ino, extent_offset);
4522 if (btrfs_should_throttle_delayed_refs(trans, root))
4523 btrfs_async_run_delayed_refs(root,
4524 trans->delayed_ref_updates * 2, 0);
4526 if (truncate_space_check(trans, root,
4527 extent_num_bytes)) {
4530 if (btrfs_should_throttle_delayed_refs(trans,
4532 should_throttle = 1;
4537 if (found_type == BTRFS_INODE_ITEM_KEY)
4540 if (path->slots[0] == 0 ||
4541 path->slots[0] != pending_del_slot ||
4542 should_throttle || should_end) {
4543 if (pending_del_nr) {
4544 ret = btrfs_del_items(trans, root, path,
4548 btrfs_abort_transaction(trans,
4554 btrfs_release_path(path);
4555 if (should_throttle) {
4556 unsigned long updates = trans->delayed_ref_updates;
4558 trans->delayed_ref_updates = 0;
4559 ret = btrfs_run_delayed_refs(trans, root, updates * 2);
4565 * if we failed to refill our space rsv, bail out
4566 * and let the transaction restart
4578 if (pending_del_nr) {
4579 ret = btrfs_del_items(trans, root, path, pending_del_slot,
4582 btrfs_abort_transaction(trans, root, ret);
4585 if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID)
4586 btrfs_ordered_update_i_size(inode, last_size, NULL);
4588 btrfs_free_path(path);
4590 if (be_nice && bytes_deleted > 32 * 1024 * 1024) {
4591 unsigned long updates = trans->delayed_ref_updates;
4593 trans->delayed_ref_updates = 0;
4594 ret = btrfs_run_delayed_refs(trans, root, updates * 2);
4603 * btrfs_truncate_page - read, zero a chunk and write a page
4604 * @inode - inode that we're zeroing
4605 * @from - the offset to start zeroing
4606 * @len - the length to zero, 0 to zero the entire range respective to the
4608 * @front - zero up to the offset instead of from the offset on
4610 * This will find the page for the "from" offset and cow the page and zero the
4611 * part we want to zero. This is used with truncate and hole punching.
4613 int btrfs_truncate_page(struct inode *inode, loff_t from, loff_t len,
4616 struct address_space *mapping = inode->i_mapping;
4617 struct btrfs_root *root = BTRFS_I(inode)->root;
4618 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
4619 struct btrfs_ordered_extent *ordered;
4620 struct extent_state *cached_state = NULL;
4622 u32 blocksize = root->sectorsize;
4623 pgoff_t index = from >> PAGE_CACHE_SHIFT;
4624 unsigned offset = from & (PAGE_CACHE_SIZE-1);
4626 gfp_t mask = btrfs_alloc_write_mask(mapping);
4631 if ((offset & (blocksize - 1)) == 0 &&
4632 (!len || ((len & (blocksize - 1)) == 0)))
4634 ret = btrfs_delalloc_reserve_space(inode,
4635 round_down(from, PAGE_CACHE_SIZE), PAGE_CACHE_SIZE);
4640 page = find_or_create_page(mapping, index, mask);
4642 btrfs_delalloc_release_space(inode,
4643 round_down(from, PAGE_CACHE_SIZE),
4649 page_start = page_offset(page);
4650 page_end = page_start + PAGE_CACHE_SIZE - 1;
4652 if (!PageUptodate(page)) {
4653 ret = btrfs_readpage(NULL, page);
4655 if (page->mapping != mapping) {
4657 page_cache_release(page);
4660 if (!PageUptodate(page)) {
4665 wait_on_page_writeback(page);
4667 lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state);
4668 set_page_extent_mapped(page);
4670 ordered = btrfs_lookup_ordered_extent(inode, page_start);
4672 unlock_extent_cached(io_tree, page_start, page_end,
4673 &cached_state, GFP_NOFS);
4675 page_cache_release(page);
4676 btrfs_start_ordered_extent(inode, ordered, 1);
4677 btrfs_put_ordered_extent(ordered);
4681 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end,
4682 EXTENT_DIRTY | EXTENT_DELALLOC |
4683 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG,
4684 0, 0, &cached_state, GFP_NOFS);
4686 ret = btrfs_set_extent_delalloc(inode, page_start, page_end,
4689 unlock_extent_cached(io_tree, page_start, page_end,
4690 &cached_state, GFP_NOFS);
4694 if (offset != PAGE_CACHE_SIZE) {
4696 len = PAGE_CACHE_SIZE - offset;
4699 memset(kaddr, 0, offset);
4701 memset(kaddr + offset, 0, len);
4702 flush_dcache_page(page);
4705 ClearPageChecked(page);
4706 set_page_dirty(page);
4707 unlock_extent_cached(io_tree, page_start, page_end, &cached_state,
4712 btrfs_delalloc_release_space(inode, page_start,
4715 page_cache_release(page);
4720 static int maybe_insert_hole(struct btrfs_root *root, struct inode *inode,
4721 u64 offset, u64 len)
4723 struct btrfs_trans_handle *trans;
4727 * Still need to make sure the inode looks like it's been updated so
4728 * that any holes get logged if we fsync.
4730 if (btrfs_fs_incompat(root->fs_info, NO_HOLES)) {
4731 BTRFS_I(inode)->last_trans = root->fs_info->generation;
4732 BTRFS_I(inode)->last_sub_trans = root->log_transid;
4733 BTRFS_I(inode)->last_log_commit = root->last_log_commit;
4738 * 1 - for the one we're dropping
4739 * 1 - for the one we're adding
4740 * 1 - for updating the inode.
4742 trans = btrfs_start_transaction(root, 3);
4744 return PTR_ERR(trans);
4746 ret = btrfs_drop_extents(trans, root, inode, offset, offset + len, 1);
4748 btrfs_abort_transaction(trans, root, ret);
4749 btrfs_end_transaction(trans, root);
4753 ret = btrfs_insert_file_extent(trans, root, btrfs_ino(inode), offset,
4754 0, 0, len, 0, len, 0, 0, 0);
4756 btrfs_abort_transaction(trans, root, ret);
4758 btrfs_update_inode(trans, root, inode);
4759 btrfs_end_transaction(trans, root);
4764 * This function puts in dummy file extents for the area we're creating a hole
4765 * for. So if we are truncating this file to a larger size we need to insert
4766 * these file extents so that btrfs_get_extent will return a EXTENT_MAP_HOLE for
4767 * the range between oldsize and size
4769 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size)
4771 struct btrfs_root *root = BTRFS_I(inode)->root;
4772 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
4773 struct extent_map *em = NULL;
4774 struct extent_state *cached_state = NULL;
4775 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
4776 u64 hole_start = ALIGN(oldsize, root->sectorsize);
4777 u64 block_end = ALIGN(size, root->sectorsize);
4784 * If our size started in the middle of a page we need to zero out the
4785 * rest of the page before we expand the i_size, otherwise we could
4786 * expose stale data.
4788 err = btrfs_truncate_page(inode, oldsize, 0, 0);
4792 if (size <= hole_start)
4796 struct btrfs_ordered_extent *ordered;
4798 lock_extent_bits(io_tree, hole_start, block_end - 1, 0,
4800 ordered = btrfs_lookup_ordered_range(inode, hole_start,
4801 block_end - hole_start);
4804 unlock_extent_cached(io_tree, hole_start, block_end - 1,
4805 &cached_state, GFP_NOFS);
4806 btrfs_start_ordered_extent(inode, ordered, 1);
4807 btrfs_put_ordered_extent(ordered);
4810 cur_offset = hole_start;
4812 em = btrfs_get_extent(inode, NULL, 0, cur_offset,
4813 block_end - cur_offset, 0);
4819 last_byte = min(extent_map_end(em), block_end);
4820 last_byte = ALIGN(last_byte , root->sectorsize);
4821 if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) {
4822 struct extent_map *hole_em;
4823 hole_size = last_byte - cur_offset;
4825 err = maybe_insert_hole(root, inode, cur_offset,
4829 btrfs_drop_extent_cache(inode, cur_offset,
4830 cur_offset + hole_size - 1, 0);
4831 hole_em = alloc_extent_map();
4833 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
4834 &BTRFS_I(inode)->runtime_flags);
4837 hole_em->start = cur_offset;
4838 hole_em->len = hole_size;
4839 hole_em->orig_start = cur_offset;
4841 hole_em->block_start = EXTENT_MAP_HOLE;
4842 hole_em->block_len = 0;
4843 hole_em->orig_block_len = 0;
4844 hole_em->ram_bytes = hole_size;
4845 hole_em->bdev = root->fs_info->fs_devices->latest_bdev;
4846 hole_em->compress_type = BTRFS_COMPRESS_NONE;
4847 hole_em->generation = root->fs_info->generation;
4850 write_lock(&em_tree->lock);
4851 err = add_extent_mapping(em_tree, hole_em, 1);
4852 write_unlock(&em_tree->lock);
4855 btrfs_drop_extent_cache(inode, cur_offset,
4859 free_extent_map(hole_em);
4862 free_extent_map(em);
4864 cur_offset = last_byte;
4865 if (cur_offset >= block_end)
4868 free_extent_map(em);
4869 unlock_extent_cached(io_tree, hole_start, block_end - 1, &cached_state,
4874 static int wait_snapshoting_atomic_t(atomic_t *a)
4880 static void wait_for_snapshot_creation(struct btrfs_root *root)
4885 ret = btrfs_start_write_no_snapshoting(root);
4888 wait_on_atomic_t(&root->will_be_snapshoted,
4889 wait_snapshoting_atomic_t,
4890 TASK_UNINTERRUPTIBLE);
4894 static int btrfs_setsize(struct inode *inode, struct iattr *attr)
4896 struct btrfs_root *root = BTRFS_I(inode)->root;
4897 struct btrfs_trans_handle *trans;
4898 loff_t oldsize = i_size_read(inode);
4899 loff_t newsize = attr->ia_size;
4900 int mask = attr->ia_valid;
4904 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
4905 * special case where we need to update the times despite not having
4906 * these flags set. For all other operations the VFS set these flags
4907 * explicitly if it wants a timestamp update.
4909 if (newsize != oldsize) {
4910 inode_inc_iversion(inode);
4911 if (!(mask & (ATTR_CTIME | ATTR_MTIME)))
4912 inode->i_ctime = inode->i_mtime =
4913 current_fs_time(inode->i_sb);
4916 if (newsize > oldsize) {
4917 truncate_pagecache(inode, newsize);
4919 * Don't do an expanding truncate while snapshoting is ongoing.
4920 * This is to ensure the snapshot captures a fully consistent
4921 * state of this file - if the snapshot captures this expanding
4922 * truncation, it must capture all writes that happened before
4925 wait_for_snapshot_creation(root);
4926 ret = btrfs_cont_expand(inode, oldsize, newsize);
4928 btrfs_end_write_no_snapshoting(root);
4932 trans = btrfs_start_transaction(root, 1);
4933 if (IS_ERR(trans)) {
4934 btrfs_end_write_no_snapshoting(root);
4935 return PTR_ERR(trans);
4938 i_size_write(inode, newsize);
4939 btrfs_ordered_update_i_size(inode, i_size_read(inode), NULL);
4940 ret = btrfs_update_inode(trans, root, inode);
4941 btrfs_end_write_no_snapshoting(root);
4942 btrfs_end_transaction(trans, root);
4946 * We're truncating a file that used to have good data down to
4947 * zero. Make sure it gets into the ordered flush list so that
4948 * any new writes get down to disk quickly.
4951 set_bit(BTRFS_INODE_ORDERED_DATA_CLOSE,
4952 &BTRFS_I(inode)->runtime_flags);
4955 * 1 for the orphan item we're going to add
4956 * 1 for the orphan item deletion.
4958 trans = btrfs_start_transaction(root, 2);
4960 return PTR_ERR(trans);
4963 * We need to do this in case we fail at _any_ point during the
4964 * actual truncate. Once we do the truncate_setsize we could
4965 * invalidate pages which forces any outstanding ordered io to
4966 * be instantly completed which will give us extents that need
4967 * to be truncated. If we fail to get an orphan inode down we
4968 * could have left over extents that were never meant to live,
4969 * so we need to garuntee from this point on that everything
4970 * will be consistent.
4972 ret = btrfs_orphan_add(trans, inode);
4973 btrfs_end_transaction(trans, root);
4977 /* we don't support swapfiles, so vmtruncate shouldn't fail */
4978 truncate_setsize(inode, newsize);
4980 /* Disable nonlocked read DIO to avoid the end less truncate */
4981 btrfs_inode_block_unlocked_dio(inode);
4982 inode_dio_wait(inode);
4983 btrfs_inode_resume_unlocked_dio(inode);
4985 ret = btrfs_truncate(inode);
4986 if (ret && inode->i_nlink) {
4990 * failed to truncate, disk_i_size is only adjusted down
4991 * as we remove extents, so it should represent the true
4992 * size of the inode, so reset the in memory size and
4993 * delete our orphan entry.
4995 trans = btrfs_join_transaction(root);
4996 if (IS_ERR(trans)) {
4997 btrfs_orphan_del(NULL, inode);
5000 i_size_write(inode, BTRFS_I(inode)->disk_i_size);
5001 err = btrfs_orphan_del(trans, inode);
5003 btrfs_abort_transaction(trans, root, err);
5004 btrfs_end_transaction(trans, root);
5011 static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
5013 struct inode *inode = d_inode(dentry);
5014 struct btrfs_root *root = BTRFS_I(inode)->root;
5017 if (btrfs_root_readonly(root))
5020 err = inode_change_ok(inode, attr);
5024 if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) {
5025 err = btrfs_setsize(inode, attr);
5030 if (attr->ia_valid) {
5031 setattr_copy(inode, attr);
5032 inode_inc_iversion(inode);
5033 err = btrfs_dirty_inode(inode);
5035 if (!err && attr->ia_valid & ATTR_MODE)
5036 err = posix_acl_chmod(inode, inode->i_mode);
5043 * While truncating the inode pages during eviction, we get the VFS calling
5044 * btrfs_invalidatepage() against each page of the inode. This is slow because
5045 * the calls to btrfs_invalidatepage() result in a huge amount of calls to
5046 * lock_extent_bits() and clear_extent_bit(), which keep merging and splitting
5047 * extent_state structures over and over, wasting lots of time.
5049 * Therefore if the inode is being evicted, let btrfs_invalidatepage() skip all
5050 * those expensive operations on a per page basis and do only the ordered io
5051 * finishing, while we release here the extent_map and extent_state structures,
5052 * without the excessive merging and splitting.
5054 static void evict_inode_truncate_pages(struct inode *inode)
5056 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
5057 struct extent_map_tree *map_tree = &BTRFS_I(inode)->extent_tree;
5058 struct rb_node *node;
5060 ASSERT(inode->i_state & I_FREEING);
5061 truncate_inode_pages_final(&inode->i_data);
5063 write_lock(&map_tree->lock);
5064 while (!RB_EMPTY_ROOT(&map_tree->map)) {
5065 struct extent_map *em;
5067 node = rb_first(&map_tree->map);
5068 em = rb_entry(node, struct extent_map, rb_node);
5069 clear_bit(EXTENT_FLAG_PINNED, &em->flags);
5070 clear_bit(EXTENT_FLAG_LOGGING, &em->flags);
5071 remove_extent_mapping(map_tree, em);
5072 free_extent_map(em);
5073 if (need_resched()) {
5074 write_unlock(&map_tree->lock);
5076 write_lock(&map_tree->lock);
5079 write_unlock(&map_tree->lock);
5082 * Keep looping until we have no more ranges in the io tree.
5083 * We can have ongoing bios started by readpages (called from readahead)
5084 * that have their endio callback (extent_io.c:end_bio_extent_readpage)
5085 * still in progress (unlocked the pages in the bio but did not yet
5086 * unlocked the ranges in the io tree). Therefore this means some
5087 * ranges can still be locked and eviction started because before
5088 * submitting those bios, which are executed by a separate task (work
5089 * queue kthread), inode references (inode->i_count) were not taken
5090 * (which would be dropped in the end io callback of each bio).
5091 * Therefore here we effectively end up waiting for those bios and
5092 * anyone else holding locked ranges without having bumped the inode's
5093 * reference count - if we don't do it, when they access the inode's
5094 * io_tree to unlock a range it may be too late, leading to an
5095 * use-after-free issue.
5097 spin_lock(&io_tree->lock);
5098 while (!RB_EMPTY_ROOT(&io_tree->state)) {
5099 struct extent_state *state;
5100 struct extent_state *cached_state = NULL;
5104 node = rb_first(&io_tree->state);
5105 state = rb_entry(node, struct extent_state, rb_node);
5106 start = state->start;
5108 spin_unlock(&io_tree->lock);
5110 lock_extent_bits(io_tree, start, end, 0, &cached_state);
5113 * If still has DELALLOC flag, the extent didn't reach disk,
5114 * and its reserved space won't be freed by delayed_ref.
5115 * So we need to free its reserved space here.
5116 * (Refer to comment in btrfs_invalidatepage, case 2)
5118 * Note, end is the bytenr of last byte, so we need + 1 here.
5120 if (state->state & EXTENT_DELALLOC)
5121 btrfs_qgroup_free_data(inode, start, end - start + 1);
5123 clear_extent_bit(io_tree, start, end,
5124 EXTENT_LOCKED | EXTENT_DIRTY |
5125 EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING |
5126 EXTENT_DEFRAG, 1, 1,
5127 &cached_state, GFP_NOFS);
5130 spin_lock(&io_tree->lock);
5132 spin_unlock(&io_tree->lock);
5135 void btrfs_evict_inode(struct inode *inode)
5137 struct btrfs_trans_handle *trans;
5138 struct btrfs_root *root = BTRFS_I(inode)->root;
5139 struct btrfs_block_rsv *rsv, *global_rsv;
5140 int steal_from_global = 0;
5141 u64 min_size = btrfs_calc_trunc_metadata_size(root, 1);
5144 trace_btrfs_inode_evict(inode);
5146 evict_inode_truncate_pages(inode);
5148 if (inode->i_nlink &&
5149 ((btrfs_root_refs(&root->root_item) != 0 &&
5150 root->root_key.objectid != BTRFS_ROOT_TREE_OBJECTID) ||
5151 btrfs_is_free_space_inode(inode)))
5154 if (is_bad_inode(inode)) {
5155 btrfs_orphan_del(NULL, inode);
5158 /* do we really want it for ->i_nlink > 0 and zero btrfs_root_refs? */
5159 if (!special_file(inode->i_mode))
5160 btrfs_wait_ordered_range(inode, 0, (u64)-1);
5162 btrfs_free_io_failure_record(inode, 0, (u64)-1);
5164 if (root->fs_info->log_root_recovering) {
5165 BUG_ON(test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM,
5166 &BTRFS_I(inode)->runtime_flags));
5170 if (inode->i_nlink > 0) {
5171 BUG_ON(btrfs_root_refs(&root->root_item) != 0 &&
5172 root->root_key.objectid != BTRFS_ROOT_TREE_OBJECTID);
5176 ret = btrfs_commit_inode_delayed_inode(inode);
5178 btrfs_orphan_del(NULL, inode);
5182 rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP);
5184 btrfs_orphan_del(NULL, inode);
5187 rsv->size = min_size;
5189 global_rsv = &root->fs_info->global_block_rsv;
5191 btrfs_i_size_write(inode, 0);
5194 * This is a bit simpler than btrfs_truncate since we've already
5195 * reserved our space for our orphan item in the unlink, so we just
5196 * need to reserve some slack space in case we add bytes and update
5197 * inode item when doing the truncate.
5200 ret = btrfs_block_rsv_refill(root, rsv, min_size,
5201 BTRFS_RESERVE_FLUSH_LIMIT);
5204 * Try and steal from the global reserve since we will
5205 * likely not use this space anyway, we want to try as
5206 * hard as possible to get this to work.
5209 steal_from_global++;
5211 steal_from_global = 0;
5215 * steal_from_global == 0: we reserved stuff, hooray!
5216 * steal_from_global == 1: we didn't reserve stuff, boo!
5217 * steal_from_global == 2: we've committed, still not a lot of
5218 * room but maybe we'll have room in the global reserve this
5220 * steal_from_global == 3: abandon all hope!
5222 if (steal_from_global > 2) {
5223 btrfs_warn(root->fs_info,
5224 "Could not get space for a delete, will truncate on mount %d",
5226 btrfs_orphan_del(NULL, inode);
5227 btrfs_free_block_rsv(root, rsv);
5231 trans = btrfs_join_transaction(root);
5232 if (IS_ERR(trans)) {
5233 btrfs_orphan_del(NULL, inode);
5234 btrfs_free_block_rsv(root, rsv);
5239 * We can't just steal from the global reserve, we need tomake
5240 * sure there is room to do it, if not we need to commit and try
5243 if (steal_from_global) {
5244 if (!btrfs_check_space_for_delayed_refs(trans, root))
5245 ret = btrfs_block_rsv_migrate(global_rsv, rsv,
5252 * Couldn't steal from the global reserve, we have too much
5253 * pending stuff built up, commit the transaction and try it
5257 ret = btrfs_commit_transaction(trans, root);
5259 btrfs_orphan_del(NULL, inode);
5260 btrfs_free_block_rsv(root, rsv);
5265 steal_from_global = 0;
5268 trans->block_rsv = rsv;
5270 ret = btrfs_truncate_inode_items(trans, root, inode, 0, 0);
5271 if (ret != -ENOSPC && ret != -EAGAIN)
5274 trans->block_rsv = &root->fs_info->trans_block_rsv;
5275 btrfs_end_transaction(trans, root);
5277 btrfs_btree_balance_dirty(root);
5280 btrfs_free_block_rsv(root, rsv);
5283 * Errors here aren't a big deal, it just means we leave orphan items
5284 * in the tree. They will be cleaned up on the next mount.
5287 trans->block_rsv = root->orphan_block_rsv;
5288 btrfs_orphan_del(trans, inode);
5290 btrfs_orphan_del(NULL, inode);
5293 trans->block_rsv = &root->fs_info->trans_block_rsv;
5294 if (!(root == root->fs_info->tree_root ||
5295 root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID))
5296 btrfs_return_ino(root, btrfs_ino(inode));
5298 btrfs_end_transaction(trans, root);
5299 btrfs_btree_balance_dirty(root);
5301 btrfs_remove_delayed_node(inode);
5307 * this returns the key found in the dir entry in the location pointer.
5308 * If no dir entries were found, location->objectid is 0.
5310 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
5311 struct btrfs_key *location)
5313 const char *name = dentry->d_name.name;
5314 int namelen = dentry->d_name.len;
5315 struct btrfs_dir_item *di;
5316 struct btrfs_path *path;
5317 struct btrfs_root *root = BTRFS_I(dir)->root;
5320 path = btrfs_alloc_path();
5324 di = btrfs_lookup_dir_item(NULL, root, path, btrfs_ino(dir), name,
5329 if (IS_ERR_OR_NULL(di))
5332 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
5334 btrfs_free_path(path);
5337 location->objectid = 0;
5342 * when we hit a tree root in a directory, the btrfs part of the inode
5343 * needs to be changed to reflect the root directory of the tree root. This
5344 * is kind of like crossing a mount point.
5346 static int fixup_tree_root_location(struct btrfs_root *root,
5348 struct dentry *dentry,
5349 struct btrfs_key *location,
5350 struct btrfs_root **sub_root)
5352 struct btrfs_path *path;
5353 struct btrfs_root *new_root;
5354 struct btrfs_root_ref *ref;
5355 struct extent_buffer *leaf;
5356 struct btrfs_key key;
5360 path = btrfs_alloc_path();
5367 key.objectid = BTRFS_I(dir)->root->root_key.objectid;
5368 key.type = BTRFS_ROOT_REF_KEY;
5369 key.offset = location->objectid;
5371 ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, path,
5379 leaf = path->nodes[0];
5380 ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref);
5381 if (btrfs_root_ref_dirid(leaf, ref) != btrfs_ino(dir) ||
5382 btrfs_root_ref_name_len(leaf, ref) != dentry->d_name.len)
5385 ret = memcmp_extent_buffer(leaf, dentry->d_name.name,
5386 (unsigned long)(ref + 1),
5387 dentry->d_name.len);
5391 btrfs_release_path(path);
5393 new_root = btrfs_read_fs_root_no_name(root->fs_info, location);
5394 if (IS_ERR(new_root)) {
5395 err = PTR_ERR(new_root);
5399 *sub_root = new_root;
5400 location->objectid = btrfs_root_dirid(&new_root->root_item);
5401 location->type = BTRFS_INODE_ITEM_KEY;
5402 location->offset = 0;
5405 btrfs_free_path(path);
5409 static void inode_tree_add(struct inode *inode)
5411 struct btrfs_root *root = BTRFS_I(inode)->root;
5412 struct btrfs_inode *entry;
5414 struct rb_node *parent;
5415 struct rb_node *new = &BTRFS_I(inode)->rb_node;
5416 u64 ino = btrfs_ino(inode);
5418 if (inode_unhashed(inode))
5421 spin_lock(&root->inode_lock);
5422 p = &root->inode_tree.rb_node;
5425 entry = rb_entry(parent, struct btrfs_inode, rb_node);
5427 if (ino < btrfs_ino(&entry->vfs_inode))
5428 p = &parent->rb_left;
5429 else if (ino > btrfs_ino(&entry->vfs_inode))
5430 p = &parent->rb_right;
5432 WARN_ON(!(entry->vfs_inode.i_state &
5433 (I_WILL_FREE | I_FREEING)));
5434 rb_replace_node(parent, new, &root->inode_tree);
5435 RB_CLEAR_NODE(parent);
5436 spin_unlock(&root->inode_lock);
5440 rb_link_node(new, parent, p);
5441 rb_insert_color(new, &root->inode_tree);
5442 spin_unlock(&root->inode_lock);
5445 static void inode_tree_del(struct inode *inode)
5447 struct btrfs_root *root = BTRFS_I(inode)->root;
5450 spin_lock(&root->inode_lock);
5451 if (!RB_EMPTY_NODE(&BTRFS_I(inode)->rb_node)) {
5452 rb_erase(&BTRFS_I(inode)->rb_node, &root->inode_tree);
5453 RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node);
5454 empty = RB_EMPTY_ROOT(&root->inode_tree);
5456 spin_unlock(&root->inode_lock);
5458 if (empty && btrfs_root_refs(&root->root_item) == 0) {
5459 synchronize_srcu(&root->fs_info->subvol_srcu);
5460 spin_lock(&root->inode_lock);
5461 empty = RB_EMPTY_ROOT(&root->inode_tree);
5462 spin_unlock(&root->inode_lock);
5464 btrfs_add_dead_root(root);
5468 void btrfs_invalidate_inodes(struct btrfs_root *root)
5470 struct rb_node *node;
5471 struct rb_node *prev;
5472 struct btrfs_inode *entry;
5473 struct inode *inode;
5476 if (!test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state))
5477 WARN_ON(btrfs_root_refs(&root->root_item) != 0);
5479 spin_lock(&root->inode_lock);
5481 node = root->inode_tree.rb_node;
5485 entry = rb_entry(node, struct btrfs_inode, rb_node);
5487 if (objectid < btrfs_ino(&entry->vfs_inode))
5488 node = node->rb_left;
5489 else if (objectid > btrfs_ino(&entry->vfs_inode))
5490 node = node->rb_right;
5496 entry = rb_entry(prev, struct btrfs_inode, rb_node);
5497 if (objectid <= btrfs_ino(&entry->vfs_inode)) {
5501 prev = rb_next(prev);
5505 entry = rb_entry(node, struct btrfs_inode, rb_node);
5506 objectid = btrfs_ino(&entry->vfs_inode) + 1;
5507 inode = igrab(&entry->vfs_inode);
5509 spin_unlock(&root->inode_lock);
5510 if (atomic_read(&inode->i_count) > 1)
5511 d_prune_aliases(inode);
5513 * btrfs_drop_inode will have it removed from
5514 * the inode cache when its usage count
5519 spin_lock(&root->inode_lock);
5523 if (cond_resched_lock(&root->inode_lock))
5526 node = rb_next(node);
5528 spin_unlock(&root->inode_lock);
5531 static int btrfs_init_locked_inode(struct inode *inode, void *p)
5533 struct btrfs_iget_args *args = p;
5534 inode->i_ino = args->location->objectid;
5535 memcpy(&BTRFS_I(inode)->location, args->location,
5536 sizeof(*args->location));
5537 BTRFS_I(inode)->root = args->root;
5541 static int btrfs_find_actor(struct inode *inode, void *opaque)
5543 struct btrfs_iget_args *args = opaque;
5544 return args->location->objectid == BTRFS_I(inode)->location.objectid &&
5545 args->root == BTRFS_I(inode)->root;
5548 static struct inode *btrfs_iget_locked(struct super_block *s,
5549 struct btrfs_key *location,
5550 struct btrfs_root *root)
5552 struct inode *inode;
5553 struct btrfs_iget_args args;
5554 unsigned long hashval = btrfs_inode_hash(location->objectid, root);
5556 args.location = location;
5559 inode = iget5_locked(s, hashval, btrfs_find_actor,
5560 btrfs_init_locked_inode,
5565 /* Get an inode object given its location and corresponding root.
5566 * Returns in *is_new if the inode was read from disk
5568 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
5569 struct btrfs_root *root, int *new)
5571 struct inode *inode;
5573 inode = btrfs_iget_locked(s, location, root);
5575 return ERR_PTR(-ENOMEM);
5577 if (inode->i_state & I_NEW) {
5578 btrfs_read_locked_inode(inode);
5579 if (!is_bad_inode(inode)) {
5580 inode_tree_add(inode);
5581 unlock_new_inode(inode);
5585 unlock_new_inode(inode);
5587 inode = ERR_PTR(-ESTALE);
5594 static struct inode *new_simple_dir(struct super_block *s,
5595 struct btrfs_key *key,
5596 struct btrfs_root *root)
5598 struct inode *inode = new_inode(s);
5601 return ERR_PTR(-ENOMEM);
5603 BTRFS_I(inode)->root = root;
5604 memcpy(&BTRFS_I(inode)->location, key, sizeof(*key));
5605 set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags);
5607 inode->i_ino = BTRFS_EMPTY_SUBVOL_DIR_OBJECTID;
5608 inode->i_op = &btrfs_dir_ro_inode_operations;
5609 inode->i_fop = &simple_dir_operations;
5610 inode->i_mode = S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO;
5611 inode->i_mtime = CURRENT_TIME;
5612 inode->i_atime = inode->i_mtime;
5613 inode->i_ctime = inode->i_mtime;
5614 BTRFS_I(inode)->i_otime = inode->i_mtime;
5619 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry)
5621 struct inode *inode;
5622 struct btrfs_root *root = BTRFS_I(dir)->root;
5623 struct btrfs_root *sub_root = root;
5624 struct btrfs_key location;
5628 if (dentry->d_name.len > BTRFS_NAME_LEN)
5629 return ERR_PTR(-ENAMETOOLONG);
5631 ret = btrfs_inode_by_name(dir, dentry, &location);
5633 return ERR_PTR(ret);
5635 if (location.objectid == 0)
5636 return ERR_PTR(-ENOENT);
5638 if (location.type == BTRFS_INODE_ITEM_KEY) {
5639 inode = btrfs_iget(dir->i_sb, &location, root, NULL);
5643 BUG_ON(location.type != BTRFS_ROOT_ITEM_KEY);
5645 index = srcu_read_lock(&root->fs_info->subvol_srcu);
5646 ret = fixup_tree_root_location(root, dir, dentry,
5647 &location, &sub_root);
5650 inode = ERR_PTR(ret);
5652 inode = new_simple_dir(dir->i_sb, &location, sub_root);
5654 inode = btrfs_iget(dir->i_sb, &location, sub_root, NULL);
5656 srcu_read_unlock(&root->fs_info->subvol_srcu, index);
5658 if (!IS_ERR(inode) && root != sub_root) {
5659 down_read(&root->fs_info->cleanup_work_sem);
5660 if (!(inode->i_sb->s_flags & MS_RDONLY))
5661 ret = btrfs_orphan_cleanup(sub_root);
5662 up_read(&root->fs_info->cleanup_work_sem);
5665 inode = ERR_PTR(ret);
5672 static int btrfs_dentry_delete(const struct dentry *dentry)
5674 struct btrfs_root *root;
5675 struct inode *inode = d_inode(dentry);
5677 if (!inode && !IS_ROOT(dentry))
5678 inode = d_inode(dentry->d_parent);
5681 root = BTRFS_I(inode)->root;
5682 if (btrfs_root_refs(&root->root_item) == 0)
5685 if (btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)
5691 static void btrfs_dentry_release(struct dentry *dentry)
5693 kfree(dentry->d_fsdata);
5696 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
5699 struct inode *inode;
5701 inode = btrfs_lookup_dentry(dir, dentry);
5702 if (IS_ERR(inode)) {
5703 if (PTR_ERR(inode) == -ENOENT)
5706 return ERR_CAST(inode);
5709 return d_splice_alias(inode, dentry);
5712 unsigned char btrfs_filetype_table[] = {
5713 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
5716 static int btrfs_real_readdir(struct file *file, struct dir_context *ctx)
5718 struct inode *inode = file_inode(file);
5719 struct btrfs_root *root = BTRFS_I(inode)->root;
5720 struct btrfs_item *item;
5721 struct btrfs_dir_item *di;
5722 struct btrfs_key key;
5723 struct btrfs_key found_key;
5724 struct btrfs_path *path;
5725 struct list_head ins_list;
5726 struct list_head del_list;
5728 struct extent_buffer *leaf;
5730 unsigned char d_type;
5735 int key_type = BTRFS_DIR_INDEX_KEY;
5739 int is_curr = 0; /* ctx->pos points to the current index? */
5742 /* FIXME, use a real flag for deciding about the key type */
5743 if (root->fs_info->tree_root == root)
5744 key_type = BTRFS_DIR_ITEM_KEY;
5746 if (!dir_emit_dots(file, ctx))
5749 path = btrfs_alloc_path();
5755 if (key_type == BTRFS_DIR_INDEX_KEY) {
5756 INIT_LIST_HEAD(&ins_list);
5757 INIT_LIST_HEAD(&del_list);
5758 btrfs_get_delayed_items(inode, &ins_list, &del_list);
5761 key.type = key_type;
5762 key.offset = ctx->pos;
5763 key.objectid = btrfs_ino(inode);
5765 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
5771 leaf = path->nodes[0];
5772 slot = path->slots[0];
5773 if (slot >= btrfs_header_nritems(leaf)) {
5774 ret = btrfs_next_leaf(root, path);
5782 item = btrfs_item_nr(slot);
5783 btrfs_item_key_to_cpu(leaf, &found_key, slot);
5785 if (found_key.objectid != key.objectid)
5787 if (found_key.type != key_type)
5789 if (found_key.offset < ctx->pos)
5791 if (key_type == BTRFS_DIR_INDEX_KEY &&
5792 btrfs_should_delete_dir_index(&del_list,
5796 ctx->pos = found_key.offset;
5799 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
5801 di_total = btrfs_item_size(leaf, item);
5803 while (di_cur < di_total) {
5804 struct btrfs_key location;
5806 if (verify_dir_item(root, leaf, di))
5809 name_len = btrfs_dir_name_len(leaf, di);
5810 if (name_len <= sizeof(tmp_name)) {
5811 name_ptr = tmp_name;
5813 name_ptr = kmalloc(name_len, GFP_NOFS);
5819 read_extent_buffer(leaf, name_ptr,
5820 (unsigned long)(di + 1), name_len);
5822 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
5823 btrfs_dir_item_key_to_cpu(leaf, di, &location);
5826 /* is this a reference to our own snapshot? If so
5829 * In contrast to old kernels, we insert the snapshot's
5830 * dir item and dir index after it has been created, so
5831 * we won't find a reference to our own snapshot. We
5832 * still keep the following code for backward
5835 if (location.type == BTRFS_ROOT_ITEM_KEY &&
5836 location.objectid == root->root_key.objectid) {
5840 over = !dir_emit(ctx, name_ptr, name_len,
5841 location.objectid, d_type);
5844 if (name_ptr != tmp_name)
5850 di_len = btrfs_dir_name_len(leaf, di) +
5851 btrfs_dir_data_len(leaf, di) + sizeof(*di);
5853 di = (struct btrfs_dir_item *)((char *)di + di_len);
5859 if (key_type == BTRFS_DIR_INDEX_KEY) {
5862 ret = btrfs_readdir_delayed_dir_index(ctx, &ins_list, &emitted);
5868 * If we haven't emitted any dir entry, we must not touch ctx->pos as
5869 * it was was set to the termination value in previous call. We assume
5870 * that "." and ".." were emitted if we reach this point and set the
5871 * termination value as well for an empty directory.
5873 if (ctx->pos > 2 && !emitted)
5876 /* Reached end of directory/root. Bump pos past the last item. */
5880 * Stop new entries from being returned after we return the last
5883 * New directory entries are assigned a strictly increasing
5884 * offset. This means that new entries created during readdir
5885 * are *guaranteed* to be seen in the future by that readdir.
5886 * This has broken buggy programs which operate on names as
5887 * they're returned by readdir. Until we re-use freed offsets
5888 * we have this hack to stop new entries from being returned
5889 * under the assumption that they'll never reach this huge
5892 * This is being careful not to overflow 32bit loff_t unless the
5893 * last entry requires it because doing so has broken 32bit apps
5896 if (key_type == BTRFS_DIR_INDEX_KEY) {
5897 if (ctx->pos >= INT_MAX)
5898 ctx->pos = LLONG_MAX;
5905 if (key_type == BTRFS_DIR_INDEX_KEY)
5906 btrfs_put_delayed_items(&ins_list, &del_list);
5907 btrfs_free_path(path);
5911 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc)
5913 struct btrfs_root *root = BTRFS_I(inode)->root;
5914 struct btrfs_trans_handle *trans;
5916 bool nolock = false;
5918 if (test_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags))
5921 if (btrfs_fs_closing(root->fs_info) && btrfs_is_free_space_inode(inode))
5924 if (wbc->sync_mode == WB_SYNC_ALL) {
5926 trans = btrfs_join_transaction_nolock(root);
5928 trans = btrfs_join_transaction(root);
5930 return PTR_ERR(trans);
5931 ret = btrfs_commit_transaction(trans, root);
5937 * This is somewhat expensive, updating the tree every time the
5938 * inode changes. But, it is most likely to find the inode in cache.
5939 * FIXME, needs more benchmarking...there are no reasons other than performance
5940 * to keep or drop this code.
5942 static int btrfs_dirty_inode(struct inode *inode)
5944 struct btrfs_root *root = BTRFS_I(inode)->root;
5945 struct btrfs_trans_handle *trans;
5948 if (test_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags))
5951 trans = btrfs_join_transaction(root);
5953 return PTR_ERR(trans);
5955 ret = btrfs_update_inode(trans, root, inode);
5956 if (ret && ret == -ENOSPC) {
5957 /* whoops, lets try again with the full transaction */
5958 btrfs_end_transaction(trans, root);
5959 trans = btrfs_start_transaction(root, 1);
5961 return PTR_ERR(trans);
5963 ret = btrfs_update_inode(trans, root, inode);
5965 btrfs_end_transaction(trans, root);
5966 if (BTRFS_I(inode)->delayed_node)
5967 btrfs_balance_delayed_items(root);
5973 * This is a copy of file_update_time. We need this so we can return error on
5974 * ENOSPC for updating the inode in the case of file write and mmap writes.
5976 static int btrfs_update_time(struct inode *inode, struct timespec *now,
5979 struct btrfs_root *root = BTRFS_I(inode)->root;
5981 if (btrfs_root_readonly(root))
5984 if (flags & S_VERSION)
5985 inode_inc_iversion(inode);
5986 if (flags & S_CTIME)
5987 inode->i_ctime = *now;
5988 if (flags & S_MTIME)
5989 inode->i_mtime = *now;
5990 if (flags & S_ATIME)
5991 inode->i_atime = *now;
5992 return btrfs_dirty_inode(inode);
5996 * find the highest existing sequence number in a directory
5997 * and then set the in-memory index_cnt variable to reflect
5998 * free sequence numbers
6000 static int btrfs_set_inode_index_count(struct inode *inode)
6002 struct btrfs_root *root = BTRFS_I(inode)->root;
6003 struct btrfs_key key, found_key;
6004 struct btrfs_path *path;
6005 struct extent_buffer *leaf;
6008 key.objectid = btrfs_ino(inode);
6009 key.type = BTRFS_DIR_INDEX_KEY;
6010 key.offset = (u64)-1;
6012 path = btrfs_alloc_path();
6016 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
6019 /* FIXME: we should be able to handle this */
6025 * MAGIC NUMBER EXPLANATION:
6026 * since we search a directory based on f_pos we have to start at 2
6027 * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody
6028 * else has to start at 2
6030 if (path->slots[0] == 0) {
6031 BTRFS_I(inode)->index_cnt = 2;
6037 leaf = path->nodes[0];
6038 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
6040 if (found_key.objectid != btrfs_ino(inode) ||
6041 found_key.type != BTRFS_DIR_INDEX_KEY) {
6042 BTRFS_I(inode)->index_cnt = 2;
6046 BTRFS_I(inode)->index_cnt = found_key.offset + 1;
6048 btrfs_free_path(path);
6053 * helper to find a free sequence number in a given directory. This current
6054 * code is very simple, later versions will do smarter things in the btree
6056 int btrfs_set_inode_index(struct inode *dir, u64 *index)
6060 if (BTRFS_I(dir)->index_cnt == (u64)-1) {
6061 ret = btrfs_inode_delayed_dir_index_count(dir);
6063 ret = btrfs_set_inode_index_count(dir);
6069 *index = BTRFS_I(dir)->index_cnt;
6070 BTRFS_I(dir)->index_cnt++;
6075 static int btrfs_insert_inode_locked(struct inode *inode)
6077 struct btrfs_iget_args args;
6078 args.location = &BTRFS_I(inode)->location;
6079 args.root = BTRFS_I(inode)->root;
6081 return insert_inode_locked4(inode,
6082 btrfs_inode_hash(inode->i_ino, BTRFS_I(inode)->root),
6083 btrfs_find_actor, &args);
6086 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
6087 struct btrfs_root *root,
6089 const char *name, int name_len,
6090 u64 ref_objectid, u64 objectid,
6091 umode_t mode, u64 *index)
6093 struct inode *inode;
6094 struct btrfs_inode_item *inode_item;
6095 struct btrfs_key *location;
6096 struct btrfs_path *path;
6097 struct btrfs_inode_ref *ref;
6098 struct btrfs_key key[2];
6100 int nitems = name ? 2 : 1;
6104 path = btrfs_alloc_path();
6106 return ERR_PTR(-ENOMEM);
6108 inode = new_inode(root->fs_info->sb);
6110 btrfs_free_path(path);
6111 return ERR_PTR(-ENOMEM);
6115 * O_TMPFILE, set link count to 0, so that after this point,
6116 * we fill in an inode item with the correct link count.
6119 set_nlink(inode, 0);
6122 * we have to initialize this early, so we can reclaim the inode
6123 * number if we fail afterwards in this function.
6125 inode->i_ino = objectid;
6128 trace_btrfs_inode_request(dir);
6130 ret = btrfs_set_inode_index(dir, index);
6132 btrfs_free_path(path);
6134 return ERR_PTR(ret);
6140 * index_cnt is ignored for everything but a dir,
6141 * btrfs_get_inode_index_count has an explanation for the magic
6144 BTRFS_I(inode)->index_cnt = 2;
6145 BTRFS_I(inode)->dir_index = *index;
6146 BTRFS_I(inode)->root = root;
6147 BTRFS_I(inode)->generation = trans->transid;
6148 inode->i_generation = BTRFS_I(inode)->generation;
6151 * We could have gotten an inode number from somebody who was fsynced
6152 * and then removed in this same transaction, so let's just set full
6153 * sync since it will be a full sync anyway and this will blow away the
6154 * old info in the log.
6156 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags);
6158 key[0].objectid = objectid;
6159 key[0].type = BTRFS_INODE_ITEM_KEY;
6162 sizes[0] = sizeof(struct btrfs_inode_item);
6166 * Start new inodes with an inode_ref. This is slightly more
6167 * efficient for small numbers of hard links since they will
6168 * be packed into one item. Extended refs will kick in if we
6169 * add more hard links than can fit in the ref item.
6171 key[1].objectid = objectid;
6172 key[1].type = BTRFS_INODE_REF_KEY;
6173 key[1].offset = ref_objectid;
6175 sizes[1] = name_len + sizeof(*ref);
6178 location = &BTRFS_I(inode)->location;
6179 location->objectid = objectid;
6180 location->offset = 0;
6181 location->type = BTRFS_INODE_ITEM_KEY;
6183 ret = btrfs_insert_inode_locked(inode);
6187 path->leave_spinning = 1;
6188 ret = btrfs_insert_empty_items(trans, root, path, key, sizes, nitems);
6192 inode_init_owner(inode, dir, mode);
6193 inode_set_bytes(inode, 0);
6195 inode->i_mtime = CURRENT_TIME;
6196 inode->i_atime = inode->i_mtime;
6197 inode->i_ctime = inode->i_mtime;
6198 BTRFS_I(inode)->i_otime = inode->i_mtime;
6200 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
6201 struct btrfs_inode_item);
6202 memset_extent_buffer(path->nodes[0], 0, (unsigned long)inode_item,
6203 sizeof(*inode_item));
6204 fill_inode_item(trans, path->nodes[0], inode_item, inode);
6207 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
6208 struct btrfs_inode_ref);
6209 btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
6210 btrfs_set_inode_ref_index(path->nodes[0], ref, *index);
6211 ptr = (unsigned long)(ref + 1);
6212 write_extent_buffer(path->nodes[0], name, ptr, name_len);
6215 btrfs_mark_buffer_dirty(path->nodes[0]);
6216 btrfs_free_path(path);
6218 btrfs_inherit_iflags(inode, dir);
6220 if (S_ISREG(mode)) {
6221 if (btrfs_test_opt(root, NODATASUM))
6222 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
6223 if (btrfs_test_opt(root, NODATACOW))
6224 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW |
6225 BTRFS_INODE_NODATASUM;
6228 inode_tree_add(inode);
6230 trace_btrfs_inode_new(inode);
6231 btrfs_set_inode_last_trans(trans, inode);
6233 btrfs_update_root_times(trans, root);
6235 ret = btrfs_inode_inherit_props(trans, inode, dir);
6237 btrfs_err(root->fs_info,
6238 "error inheriting props for ino %llu (root %llu): %d",
6239 btrfs_ino(inode), root->root_key.objectid, ret);
6244 unlock_new_inode(inode);
6247 BTRFS_I(dir)->index_cnt--;
6248 btrfs_free_path(path);
6250 return ERR_PTR(ret);
6253 static inline u8 btrfs_inode_type(struct inode *inode)
6255 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
6259 * utility function to add 'inode' into 'parent_inode' with
6260 * a give name and a given sequence number.
6261 * if 'add_backref' is true, also insert a backref from the
6262 * inode to the parent directory.
6264 int btrfs_add_link(struct btrfs_trans_handle *trans,
6265 struct inode *parent_inode, struct inode *inode,
6266 const char *name, int name_len, int add_backref, u64 index)
6269 struct btrfs_key key;
6270 struct btrfs_root *root = BTRFS_I(parent_inode)->root;
6271 u64 ino = btrfs_ino(inode);
6272 u64 parent_ino = btrfs_ino(parent_inode);
6274 if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) {
6275 memcpy(&key, &BTRFS_I(inode)->root->root_key, sizeof(key));
6278 key.type = BTRFS_INODE_ITEM_KEY;
6282 if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) {
6283 ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
6284 key.objectid, root->root_key.objectid,
6285 parent_ino, index, name, name_len);
6286 } else if (add_backref) {
6287 ret = btrfs_insert_inode_ref(trans, root, name, name_len, ino,
6291 /* Nothing to clean up yet */
6295 ret = btrfs_insert_dir_item(trans, root, name, name_len,
6297 btrfs_inode_type(inode), index);
6298 if (ret == -EEXIST || ret == -EOVERFLOW)
6301 btrfs_abort_transaction(trans, root, ret);
6305 btrfs_i_size_write(parent_inode, parent_inode->i_size +
6307 inode_inc_iversion(parent_inode);
6308 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
6309 ret = btrfs_update_inode(trans, root, parent_inode);
6311 btrfs_abort_transaction(trans, root, ret);
6315 if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) {
6318 err = btrfs_del_root_ref(trans, root->fs_info->tree_root,
6319 key.objectid, root->root_key.objectid,
6320 parent_ino, &local_index, name, name_len);
6322 } else if (add_backref) {
6326 err = btrfs_del_inode_ref(trans, root, name, name_len,
6327 ino, parent_ino, &local_index);
6332 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
6333 struct inode *dir, struct dentry *dentry,
6334 struct inode *inode, int backref, u64 index)
6336 int err = btrfs_add_link(trans, dir, inode,
6337 dentry->d_name.name, dentry->d_name.len,
6344 static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
6345 umode_t mode, dev_t rdev)
6347 struct btrfs_trans_handle *trans;
6348 struct btrfs_root *root = BTRFS_I(dir)->root;
6349 struct inode *inode = NULL;
6356 * 2 for inode item and ref
6358 * 1 for xattr if selinux is on
6360 trans = btrfs_start_transaction(root, 5);
6362 return PTR_ERR(trans);
6364 err = btrfs_find_free_ino(root, &objectid);
6368 inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
6369 dentry->d_name.len, btrfs_ino(dir), objectid,
6371 if (IS_ERR(inode)) {
6372 err = PTR_ERR(inode);
6377 * If the active LSM wants to access the inode during
6378 * d_instantiate it needs these. Smack checks to see
6379 * if the filesystem supports xattrs by looking at the
6382 inode->i_op = &btrfs_special_inode_operations;
6383 init_special_inode(inode, inode->i_mode, rdev);
6385 err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name);
6387 goto out_unlock_inode;
6389 err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index);
6391 goto out_unlock_inode;
6393 btrfs_update_inode(trans, root, inode);
6394 unlock_new_inode(inode);
6395 d_instantiate(dentry, inode);
6399 btrfs_end_transaction(trans, root);
6400 btrfs_balance_delayed_items(root);
6401 btrfs_btree_balance_dirty(root);
6403 inode_dec_link_count(inode);
6410 unlock_new_inode(inode);
6415 static int btrfs_create(struct inode *dir, struct dentry *dentry,
6416 umode_t mode, bool excl)
6418 struct btrfs_trans_handle *trans;
6419 struct btrfs_root *root = BTRFS_I(dir)->root;
6420 struct inode *inode = NULL;
6421 int drop_inode_on_err = 0;
6427 * 2 for inode item and ref
6429 * 1 for xattr if selinux is on
6431 trans = btrfs_start_transaction(root, 5);
6433 return PTR_ERR(trans);
6435 err = btrfs_find_free_ino(root, &objectid);
6439 inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
6440 dentry->d_name.len, btrfs_ino(dir), objectid,
6442 if (IS_ERR(inode)) {
6443 err = PTR_ERR(inode);
6446 drop_inode_on_err = 1;
6448 * If the active LSM wants to access the inode during
6449 * d_instantiate it needs these. Smack checks to see
6450 * if the filesystem supports xattrs by looking at the
6453 inode->i_fop = &btrfs_file_operations;
6454 inode->i_op = &btrfs_file_inode_operations;
6455 inode->i_mapping->a_ops = &btrfs_aops;
6457 err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name);
6459 goto out_unlock_inode;
6461 err = btrfs_update_inode(trans, root, inode);
6463 goto out_unlock_inode;
6465 err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index);
6467 goto out_unlock_inode;
6469 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
6470 unlock_new_inode(inode);
6471 d_instantiate(dentry, inode);
6474 btrfs_end_transaction(trans, root);
6475 if (err && drop_inode_on_err) {
6476 inode_dec_link_count(inode);
6479 btrfs_balance_delayed_items(root);
6480 btrfs_btree_balance_dirty(root);
6484 unlock_new_inode(inode);
6489 static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
6490 struct dentry *dentry)
6492 struct btrfs_trans_handle *trans = NULL;
6493 struct btrfs_root *root = BTRFS_I(dir)->root;
6494 struct inode *inode = d_inode(old_dentry);
6499 /* do not allow sys_link's with other subvols of the same device */
6500 if (root->objectid != BTRFS_I(inode)->root->objectid)
6503 if (inode->i_nlink >= BTRFS_LINK_MAX)
6506 err = btrfs_set_inode_index(dir, &index);
6511 * 2 items for inode and inode ref
6512 * 2 items for dir items
6513 * 1 item for parent inode
6515 trans = btrfs_start_transaction(root, 5);
6516 if (IS_ERR(trans)) {
6517 err = PTR_ERR(trans);
6522 /* There are several dir indexes for this inode, clear the cache. */
6523 BTRFS_I(inode)->dir_index = 0ULL;
6525 inode_inc_iversion(inode);
6526 inode->i_ctime = CURRENT_TIME;
6528 set_bit(BTRFS_INODE_COPY_EVERYTHING, &BTRFS_I(inode)->runtime_flags);
6530 err = btrfs_add_nondir(trans, dir, dentry, inode, 1, index);
6535 struct dentry *parent = dentry->d_parent;
6536 err = btrfs_update_inode(trans, root, inode);
6539 if (inode->i_nlink == 1) {
6541 * If new hard link count is 1, it's a file created
6542 * with open(2) O_TMPFILE flag.
6544 err = btrfs_orphan_del(trans, inode);
6548 d_instantiate(dentry, inode);
6549 btrfs_log_new_name(trans, inode, NULL, parent);
6552 btrfs_balance_delayed_items(root);
6555 btrfs_end_transaction(trans, root);
6557 inode_dec_link_count(inode);
6560 btrfs_btree_balance_dirty(root);
6564 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
6566 struct inode *inode = NULL;
6567 struct btrfs_trans_handle *trans;
6568 struct btrfs_root *root = BTRFS_I(dir)->root;
6570 int drop_on_err = 0;
6575 * 2 items for inode and ref
6576 * 2 items for dir items
6577 * 1 for xattr if selinux is on
6579 trans = btrfs_start_transaction(root, 5);
6581 return PTR_ERR(trans);
6583 err = btrfs_find_free_ino(root, &objectid);
6587 inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
6588 dentry->d_name.len, btrfs_ino(dir), objectid,
6589 S_IFDIR | mode, &index);
6590 if (IS_ERR(inode)) {
6591 err = PTR_ERR(inode);
6596 /* these must be set before we unlock the inode */
6597 inode->i_op = &btrfs_dir_inode_operations;
6598 inode->i_fop = &btrfs_dir_file_operations;
6600 err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name);
6602 goto out_fail_inode;
6604 btrfs_i_size_write(inode, 0);
6605 err = btrfs_update_inode(trans, root, inode);
6607 goto out_fail_inode;
6609 err = btrfs_add_link(trans, dir, inode, dentry->d_name.name,
6610 dentry->d_name.len, 0, index);
6612 goto out_fail_inode;
6614 d_instantiate(dentry, inode);
6616 * mkdir is special. We're unlocking after we call d_instantiate
6617 * to avoid a race with nfsd calling d_instantiate.
6619 unlock_new_inode(inode);
6623 btrfs_end_transaction(trans, root);
6625 inode_dec_link_count(inode);
6628 btrfs_balance_delayed_items(root);
6629 btrfs_btree_balance_dirty(root);
6633 unlock_new_inode(inode);
6637 /* Find next extent map of a given extent map, caller needs to ensure locks */
6638 static struct extent_map *next_extent_map(struct extent_map *em)
6640 struct rb_node *next;
6642 next = rb_next(&em->rb_node);
6645 return container_of(next, struct extent_map, rb_node);
6648 static struct extent_map *prev_extent_map(struct extent_map *em)
6650 struct rb_node *prev;
6652 prev = rb_prev(&em->rb_node);
6655 return container_of(prev, struct extent_map, rb_node);
6658 /* helper for btfs_get_extent. Given an existing extent in the tree,
6659 * the existing extent is the nearest extent to map_start,
6660 * and an extent that you want to insert, deal with overlap and insert
6661 * the best fitted new extent into the tree.
6663 static int merge_extent_mapping(struct extent_map_tree *em_tree,
6664 struct extent_map *existing,
6665 struct extent_map *em,
6668 struct extent_map *prev;
6669 struct extent_map *next;
6674 BUG_ON(map_start < em->start || map_start >= extent_map_end(em));
6676 if (existing->start > map_start) {
6678 prev = prev_extent_map(next);
6681 next = next_extent_map(prev);
6684 start = prev ? extent_map_end(prev) : em->start;
6685 start = max_t(u64, start, em->start);
6686 end = next ? next->start : extent_map_end(em);
6687 end = min_t(u64, end, extent_map_end(em));
6688 start_diff = start - em->start;
6690 em->len = end - start;
6691 if (em->block_start < EXTENT_MAP_LAST_BYTE &&
6692 !test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) {
6693 em->block_start += start_diff;
6694 em->block_len -= start_diff;
6696 return add_extent_mapping(em_tree, em, 0);
6699 static noinline int uncompress_inline(struct btrfs_path *path,
6700 struct inode *inode, struct page *page,
6701 size_t pg_offset, u64 extent_offset,
6702 struct btrfs_file_extent_item *item)
6705 struct extent_buffer *leaf = path->nodes[0];
6708 unsigned long inline_size;
6712 WARN_ON(pg_offset != 0);
6713 compress_type = btrfs_file_extent_compression(leaf, item);
6714 max_size = btrfs_file_extent_ram_bytes(leaf, item);
6715 inline_size = btrfs_file_extent_inline_item_len(leaf,
6716 btrfs_item_nr(path->slots[0]));
6717 tmp = kmalloc(inline_size, GFP_NOFS);
6720 ptr = btrfs_file_extent_inline_start(item);
6722 read_extent_buffer(leaf, tmp, ptr, inline_size);
6724 max_size = min_t(unsigned long, PAGE_CACHE_SIZE, max_size);
6725 ret = btrfs_decompress(compress_type, tmp, page,
6726 extent_offset, inline_size, max_size);
6732 * a bit scary, this does extent mapping from logical file offset to the disk.
6733 * the ugly parts come from merging extents from the disk with the in-ram
6734 * representation. This gets more complex because of the data=ordered code,
6735 * where the in-ram extents might be locked pending data=ordered completion.
6737 * This also copies inline extents directly into the page.
6740 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
6741 size_t pg_offset, u64 start, u64 len,
6746 u64 extent_start = 0;
6748 u64 objectid = btrfs_ino(inode);
6750 struct btrfs_path *path = NULL;
6751 struct btrfs_root *root = BTRFS_I(inode)->root;
6752 struct btrfs_file_extent_item *item;
6753 struct extent_buffer *leaf;
6754 struct btrfs_key found_key;
6755 struct extent_map *em = NULL;
6756 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
6757 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
6758 struct btrfs_trans_handle *trans = NULL;
6759 const bool new_inline = !page || create;
6762 read_lock(&em_tree->lock);
6763 em = lookup_extent_mapping(em_tree, start, len);
6765 em->bdev = root->fs_info->fs_devices->latest_bdev;
6766 read_unlock(&em_tree->lock);
6769 if (em->start > start || em->start + em->len <= start)
6770 free_extent_map(em);
6771 else if (em->block_start == EXTENT_MAP_INLINE && page)
6772 free_extent_map(em);
6776 em = alloc_extent_map();
6781 em->bdev = root->fs_info->fs_devices->latest_bdev;
6782 em->start = EXTENT_MAP_HOLE;
6783 em->orig_start = EXTENT_MAP_HOLE;
6785 em->block_len = (u64)-1;
6788 path = btrfs_alloc_path();
6794 * Chances are we'll be called again, so go ahead and do
6800 ret = btrfs_lookup_file_extent(trans, root, path,
6801 objectid, start, trans != NULL);
6808 if (path->slots[0] == 0)
6813 leaf = path->nodes[0];
6814 item = btrfs_item_ptr(leaf, path->slots[0],
6815 struct btrfs_file_extent_item);
6816 /* are we inside the extent that was found? */
6817 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
6818 found_type = found_key.type;
6819 if (found_key.objectid != objectid ||
6820 found_type != BTRFS_EXTENT_DATA_KEY) {
6822 * If we backup past the first extent we want to move forward
6823 * and see if there is an extent in front of us, otherwise we'll
6824 * say there is a hole for our whole search range which can
6831 found_type = btrfs_file_extent_type(leaf, item);
6832 extent_start = found_key.offset;
6833 if (found_type == BTRFS_FILE_EXTENT_REG ||
6834 found_type == BTRFS_FILE_EXTENT_PREALLOC) {
6835 extent_end = extent_start +
6836 btrfs_file_extent_num_bytes(leaf, item);
6837 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
6839 size = btrfs_file_extent_inline_len(leaf, path->slots[0], item);
6840 extent_end = ALIGN(extent_start + size, root->sectorsize);
6843 if (start >= extent_end) {
6845 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
6846 ret = btrfs_next_leaf(root, path);
6853 leaf = path->nodes[0];
6855 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
6856 if (found_key.objectid != objectid ||
6857 found_key.type != BTRFS_EXTENT_DATA_KEY)
6859 if (start + len <= found_key.offset)
6861 if (start > found_key.offset)
6864 em->orig_start = start;
6865 em->len = found_key.offset - start;
6869 btrfs_extent_item_to_extent_map(inode, path, item, new_inline, em);
6871 if (found_type == BTRFS_FILE_EXTENT_REG ||
6872 found_type == BTRFS_FILE_EXTENT_PREALLOC) {
6874 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
6878 size_t extent_offset;
6884 size = btrfs_file_extent_inline_len(leaf, path->slots[0], item);
6885 extent_offset = page_offset(page) + pg_offset - extent_start;
6886 copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
6887 size - extent_offset);
6888 em->start = extent_start + extent_offset;
6889 em->len = ALIGN(copy_size, root->sectorsize);
6890 em->orig_block_len = em->len;
6891 em->orig_start = em->start;
6892 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
6893 if (create == 0 && !PageUptodate(page)) {
6894 if (btrfs_file_extent_compression(leaf, item) !=
6895 BTRFS_COMPRESS_NONE) {
6896 ret = uncompress_inline(path, inode, page,
6898 extent_offset, item);
6905 read_extent_buffer(leaf, map + pg_offset, ptr,
6907 if (pg_offset + copy_size < PAGE_CACHE_SIZE) {
6908 memset(map + pg_offset + copy_size, 0,
6909 PAGE_CACHE_SIZE - pg_offset -
6914 flush_dcache_page(page);
6915 } else if (create && PageUptodate(page)) {
6919 free_extent_map(em);
6922 btrfs_release_path(path);
6923 trans = btrfs_join_transaction(root);
6926 return ERR_CAST(trans);
6930 write_extent_buffer(leaf, map + pg_offset, ptr,
6933 btrfs_mark_buffer_dirty(leaf);
6935 set_extent_uptodate(io_tree, em->start,
6936 extent_map_end(em) - 1, NULL, GFP_NOFS);
6941 em->orig_start = start;
6944 em->block_start = EXTENT_MAP_HOLE;
6945 set_bit(EXTENT_FLAG_VACANCY, &em->flags);
6947 btrfs_release_path(path);
6948 if (em->start > start || extent_map_end(em) <= start) {
6949 btrfs_err(root->fs_info, "bad extent! em: [%llu %llu] passed [%llu %llu]",
6950 em->start, em->len, start, len);
6956 write_lock(&em_tree->lock);
6957 ret = add_extent_mapping(em_tree, em, 0);
6958 /* it is possible that someone inserted the extent into the tree
6959 * while we had the lock dropped. It is also possible that
6960 * an overlapping map exists in the tree
6962 if (ret == -EEXIST) {
6963 struct extent_map *existing;
6967 existing = search_extent_mapping(em_tree, start, len);
6969 * existing will always be non-NULL, since there must be
6970 * extent causing the -EEXIST.
6972 if (start >= extent_map_end(existing) ||
6973 start <= existing->start) {
6975 * The existing extent map is the one nearest to
6976 * the [start, start + len) range which overlaps
6978 err = merge_extent_mapping(em_tree, existing,
6980 free_extent_map(existing);
6982 free_extent_map(em);
6986 free_extent_map(em);
6991 write_unlock(&em_tree->lock);
6994 trace_btrfs_get_extent(root, em);
6996 btrfs_free_path(path);
6998 ret = btrfs_end_transaction(trans, root);
7003 free_extent_map(em);
7004 return ERR_PTR(err);
7006 BUG_ON(!em); /* Error is always set */
7010 struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page,
7011 size_t pg_offset, u64 start, u64 len,
7014 struct extent_map *em;
7015 struct extent_map *hole_em = NULL;
7016 u64 range_start = start;
7022 em = btrfs_get_extent(inode, page, pg_offset, start, len, create);
7029 * - a pre-alloc extent,
7030 * there might actually be delalloc bytes behind it.
7032 if (em->block_start != EXTENT_MAP_HOLE &&
7033 !test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
7039 /* check to see if we've wrapped (len == -1 or similar) */
7048 /* ok, we didn't find anything, lets look for delalloc */
7049 found = count_range_bits(&BTRFS_I(inode)->io_tree, &range_start,
7050 end, len, EXTENT_DELALLOC, 1);
7051 found_end = range_start + found;
7052 if (found_end < range_start)
7053 found_end = (u64)-1;
7056 * we didn't find anything useful, return
7057 * the original results from get_extent()
7059 if (range_start > end || found_end <= start) {
7065 /* adjust the range_start to make sure it doesn't
7066 * go backwards from the start they passed in
7068 range_start = max(start, range_start);
7069 found = found_end - range_start;
7072 u64 hole_start = start;
7075 em = alloc_extent_map();
7081 * when btrfs_get_extent can't find anything it
7082 * returns one huge hole
7084 * make sure what it found really fits our range, and
7085 * adjust to make sure it is based on the start from
7089 u64 calc_end = extent_map_end(hole_em);
7091 if (calc_end <= start || (hole_em->start > end)) {
7092 free_extent_map(hole_em);
7095 hole_start = max(hole_em->start, start);
7096 hole_len = calc_end - hole_start;
7100 if (hole_em && range_start > hole_start) {
7101 /* our hole starts before our delalloc, so we
7102 * have to return just the parts of the hole
7103 * that go until the delalloc starts
7105 em->len = min(hole_len,
7106 range_start - hole_start);
7107 em->start = hole_start;
7108 em->orig_start = hole_start;
7110 * don't adjust block start at all,
7111 * it is fixed at EXTENT_MAP_HOLE
7113 em->block_start = hole_em->block_start;
7114 em->block_len = hole_len;
7115 if (test_bit(EXTENT_FLAG_PREALLOC, &hole_em->flags))
7116 set_bit(EXTENT_FLAG_PREALLOC, &em->flags);
7118 em->start = range_start;
7120 em->orig_start = range_start;
7121 em->block_start = EXTENT_MAP_DELALLOC;
7122 em->block_len = found;
7124 } else if (hole_em) {
7129 free_extent_map(hole_em);
7131 free_extent_map(em);
7132 return ERR_PTR(err);
7137 static struct extent_map *btrfs_new_extent_direct(struct inode *inode,
7140 struct btrfs_root *root = BTRFS_I(inode)->root;
7141 struct extent_map *em;
7142 struct btrfs_key ins;
7146 alloc_hint = get_extent_allocation_hint(inode, start, len);
7147 ret = btrfs_reserve_extent(root, len, root->sectorsize, 0,
7148 alloc_hint, &ins, 1, 1);
7150 return ERR_PTR(ret);
7152 em = create_pinned_em(inode, start, ins.offset, start, ins.objectid,
7153 ins.offset, ins.offset, ins.offset, 0);
7155 btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 1);
7159 ret = btrfs_add_ordered_extent_dio(inode, start, ins.objectid,
7160 ins.offset, ins.offset, 0);
7162 btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 1);
7163 free_extent_map(em);
7164 return ERR_PTR(ret);
7171 * returns 1 when the nocow is safe, < 1 on error, 0 if the
7172 * block must be cow'd
7174 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
7175 u64 *orig_start, u64 *orig_block_len,
7178 struct btrfs_trans_handle *trans;
7179 struct btrfs_path *path;
7181 struct extent_buffer *leaf;
7182 struct btrfs_root *root = BTRFS_I(inode)->root;
7183 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
7184 struct btrfs_file_extent_item *fi;
7185 struct btrfs_key key;
7192 bool nocow = (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW);
7194 path = btrfs_alloc_path();
7198 ret = btrfs_lookup_file_extent(NULL, root, path, btrfs_ino(inode),
7203 slot = path->slots[0];
7206 /* can't find the item, must cow */
7213 leaf = path->nodes[0];
7214 btrfs_item_key_to_cpu(leaf, &key, slot);
7215 if (key.objectid != btrfs_ino(inode) ||
7216 key.type != BTRFS_EXTENT_DATA_KEY) {
7217 /* not our file or wrong item type, must cow */
7221 if (key.offset > offset) {
7222 /* Wrong offset, must cow */
7226 fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
7227 found_type = btrfs_file_extent_type(leaf, fi);
7228 if (found_type != BTRFS_FILE_EXTENT_REG &&
7229 found_type != BTRFS_FILE_EXTENT_PREALLOC) {
7230 /* not a regular extent, must cow */
7234 if (!nocow && found_type == BTRFS_FILE_EXTENT_REG)
7237 extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi);
7238 if (extent_end <= offset)
7241 disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
7242 if (disk_bytenr == 0)
7245 if (btrfs_file_extent_compression(leaf, fi) ||
7246 btrfs_file_extent_encryption(leaf, fi) ||
7247 btrfs_file_extent_other_encoding(leaf, fi))
7250 backref_offset = btrfs_file_extent_offset(leaf, fi);
7253 *orig_start = key.offset - backref_offset;
7254 *orig_block_len = btrfs_file_extent_disk_num_bytes(leaf, fi);
7255 *ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi);
7258 if (btrfs_extent_readonly(root, disk_bytenr))
7261 num_bytes = min(offset + *len, extent_end) - offset;
7262 if (!nocow && found_type == BTRFS_FILE_EXTENT_PREALLOC) {
7265 range_end = round_up(offset + num_bytes, root->sectorsize) - 1;
7266 ret = test_range_bit(io_tree, offset, range_end,
7267 EXTENT_DELALLOC, 0, NULL);
7274 btrfs_release_path(path);
7277 * look for other files referencing this extent, if we
7278 * find any we must cow
7280 trans = btrfs_join_transaction(root);
7281 if (IS_ERR(trans)) {
7286 ret = btrfs_cross_ref_exist(trans, root, btrfs_ino(inode),
7287 key.offset - backref_offset, disk_bytenr);
7288 btrfs_end_transaction(trans, root);
7295 * adjust disk_bytenr and num_bytes to cover just the bytes
7296 * in this extent we are about to write. If there
7297 * are any csums in that range we have to cow in order
7298 * to keep the csums correct
7300 disk_bytenr += backref_offset;
7301 disk_bytenr += offset - key.offset;
7302 if (csum_exist_in_range(root, disk_bytenr, num_bytes))
7305 * all of the above have passed, it is safe to overwrite this extent
7311 btrfs_free_path(path);
7315 bool btrfs_page_exists_in_range(struct inode *inode, loff_t start, loff_t end)
7317 struct radix_tree_root *root = &inode->i_mapping->page_tree;
7319 void **pagep = NULL;
7320 struct page *page = NULL;
7324 start_idx = start >> PAGE_CACHE_SHIFT;
7327 * end is the last byte in the last page. end == start is legal
7329 end_idx = end >> PAGE_CACHE_SHIFT;
7333 /* Most of the code in this while loop is lifted from
7334 * find_get_page. It's been modified to begin searching from a
7335 * page and return just the first page found in that range. If the
7336 * found idx is less than or equal to the end idx then we know that
7337 * a page exists. If no pages are found or if those pages are
7338 * outside of the range then we're fine (yay!) */
7339 while (page == NULL &&
7340 radix_tree_gang_lookup_slot(root, &pagep, NULL, start_idx, 1)) {
7341 page = radix_tree_deref_slot(pagep);
7342 if (unlikely(!page))
7345 if (radix_tree_exception(page)) {
7346 if (radix_tree_deref_retry(page)) {
7351 * Otherwise, shmem/tmpfs must be storing a swap entry
7352 * here as an exceptional entry: so return it without
7353 * attempting to raise page count.
7356 break; /* TODO: Is this relevant for this use case? */
7359 if (!page_cache_get_speculative(page)) {
7365 * Has the page moved?
7366 * This is part of the lockless pagecache protocol. See
7367 * include/linux/pagemap.h for details.
7369 if (unlikely(page != *pagep)) {
7370 page_cache_release(page);
7376 if (page->index <= end_idx)
7378 page_cache_release(page);
7385 static int lock_extent_direct(struct inode *inode, u64 lockstart, u64 lockend,
7386 struct extent_state **cached_state, int writing)
7388 struct btrfs_ordered_extent *ordered;
7392 lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend,
7395 * We're concerned with the entire range that we're going to be
7396 * doing DIO to, so we need to make sure theres no ordered
7397 * extents in this range.
7399 ordered = btrfs_lookup_ordered_range(inode, lockstart,
7400 lockend - lockstart + 1);
7403 * We need to make sure there are no buffered pages in this
7404 * range either, we could have raced between the invalidate in
7405 * generic_file_direct_write and locking the extent. The
7406 * invalidate needs to happen so that reads after a write do not
7411 !btrfs_page_exists_in_range(inode, lockstart, lockend)))
7414 unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend,
7415 cached_state, GFP_NOFS);
7418 btrfs_start_ordered_extent(inode, ordered, 1);
7419 btrfs_put_ordered_extent(ordered);
7421 /* Screw you mmap */
7422 ret = btrfs_fdatawrite_range(inode, lockstart, lockend);
7425 ret = filemap_fdatawait_range(inode->i_mapping,
7432 * If we found a page that couldn't be invalidated just
7433 * fall back to buffered.
7435 ret = invalidate_inode_pages2_range(inode->i_mapping,
7436 lockstart >> PAGE_CACHE_SHIFT,
7437 lockend >> PAGE_CACHE_SHIFT);
7448 static struct extent_map *create_pinned_em(struct inode *inode, u64 start,
7449 u64 len, u64 orig_start,
7450 u64 block_start, u64 block_len,
7451 u64 orig_block_len, u64 ram_bytes,
7454 struct extent_map_tree *em_tree;
7455 struct extent_map *em;
7456 struct btrfs_root *root = BTRFS_I(inode)->root;
7459 em_tree = &BTRFS_I(inode)->extent_tree;
7460 em = alloc_extent_map();
7462 return ERR_PTR(-ENOMEM);
7465 em->orig_start = orig_start;
7466 em->mod_start = start;
7469 em->block_len = block_len;
7470 em->block_start = block_start;
7471 em->bdev = root->fs_info->fs_devices->latest_bdev;
7472 em->orig_block_len = orig_block_len;
7473 em->ram_bytes = ram_bytes;
7474 em->generation = -1;
7475 set_bit(EXTENT_FLAG_PINNED, &em->flags);
7476 if (type == BTRFS_ORDERED_PREALLOC)
7477 set_bit(EXTENT_FLAG_FILLING, &em->flags);
7480 btrfs_drop_extent_cache(inode, em->start,
7481 em->start + em->len - 1, 0);
7482 write_lock(&em_tree->lock);
7483 ret = add_extent_mapping(em_tree, em, 1);
7484 write_unlock(&em_tree->lock);
7485 } while (ret == -EEXIST);
7488 free_extent_map(em);
7489 return ERR_PTR(ret);
7495 struct btrfs_dio_data {
7496 u64 outstanding_extents;
7500 static void adjust_dio_outstanding_extents(struct inode *inode,
7501 struct btrfs_dio_data *dio_data,
7504 unsigned num_extents;
7506 num_extents = (unsigned) div64_u64(len + BTRFS_MAX_EXTENT_SIZE - 1,
7507 BTRFS_MAX_EXTENT_SIZE);
7509 * If we have an outstanding_extents count still set then we're
7510 * within our reservation, otherwise we need to adjust our inode
7511 * counter appropriately.
7513 if (dio_data->outstanding_extents) {
7514 dio_data->outstanding_extents -= num_extents;
7516 spin_lock(&BTRFS_I(inode)->lock);
7517 BTRFS_I(inode)->outstanding_extents += num_extents;
7518 spin_unlock(&BTRFS_I(inode)->lock);
7522 static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock,
7523 struct buffer_head *bh_result, int create)
7525 struct extent_map *em;
7526 struct btrfs_root *root = BTRFS_I(inode)->root;
7527 struct extent_state *cached_state = NULL;
7528 struct btrfs_dio_data *dio_data = NULL;
7529 u64 start = iblock << inode->i_blkbits;
7530 u64 lockstart, lockend;
7531 u64 len = bh_result->b_size;
7532 int unlock_bits = EXTENT_LOCKED;
7536 unlock_bits |= EXTENT_DIRTY;
7538 len = min_t(u64, len, root->sectorsize);
7541 lockend = start + len - 1;
7543 if (current->journal_info) {
7545 * Need to pull our outstanding extents and set journal_info to NULL so
7546 * that anything that needs to check if there's a transction doesn't get
7549 dio_data = current->journal_info;
7550 current->journal_info = NULL;
7554 * If this errors out it's because we couldn't invalidate pagecache for
7555 * this range and we need to fallback to buffered.
7557 if (lock_extent_direct(inode, lockstart, lockend, &cached_state,
7563 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
7570 * Ok for INLINE and COMPRESSED extents we need to fallback on buffered
7571 * io. INLINE is special, and we could probably kludge it in here, but
7572 * it's still buffered so for safety lets just fall back to the generic
7575 * For COMPRESSED we _have_ to read the entire extent in so we can
7576 * decompress it, so there will be buffering required no matter what we
7577 * do, so go ahead and fallback to buffered.
7579 * We return -ENOTBLK because thats what makes DIO go ahead and go back
7580 * to buffered IO. Don't blame me, this is the price we pay for using
7583 if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) ||
7584 em->block_start == EXTENT_MAP_INLINE) {
7585 free_extent_map(em);
7590 /* Just a good old fashioned hole, return */
7591 if (!create && (em->block_start == EXTENT_MAP_HOLE ||
7592 test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) {
7593 free_extent_map(em);
7598 * We don't allocate a new extent in the following cases
7600 * 1) The inode is marked as NODATACOW. In this case we'll just use the
7602 * 2) The extent is marked as PREALLOC. We're good to go here and can
7603 * just use the extent.
7607 len = min(len, em->len - (start - em->start));
7608 lockstart = start + len;
7612 if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) ||
7613 ((BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) &&
7614 em->block_start != EXTENT_MAP_HOLE)) {
7616 u64 block_start, orig_start, orig_block_len, ram_bytes;
7618 if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
7619 type = BTRFS_ORDERED_PREALLOC;
7621 type = BTRFS_ORDERED_NOCOW;
7622 len = min(len, em->len - (start - em->start));
7623 block_start = em->block_start + (start - em->start);
7625 if (can_nocow_extent(inode, start, &len, &orig_start,
7626 &orig_block_len, &ram_bytes) == 1) {
7627 if (type == BTRFS_ORDERED_PREALLOC) {
7628 free_extent_map(em);
7629 em = create_pinned_em(inode, start, len,
7640 ret = btrfs_add_ordered_extent_dio(inode, start,
7641 block_start, len, len, type);
7643 free_extent_map(em);
7651 * this will cow the extent, reset the len in case we changed
7654 len = bh_result->b_size;
7655 free_extent_map(em);
7656 em = btrfs_new_extent_direct(inode, start, len);
7661 len = min(len, em->len - (start - em->start));
7663 bh_result->b_blocknr = (em->block_start + (start - em->start)) >>
7665 bh_result->b_size = len;
7666 bh_result->b_bdev = em->bdev;
7667 set_buffer_mapped(bh_result);
7669 if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
7670 set_buffer_new(bh_result);
7673 * Need to update the i_size under the extent lock so buffered
7674 * readers will get the updated i_size when we unlock.
7676 if (start + len > i_size_read(inode))
7677 i_size_write(inode, start + len);
7679 adjust_dio_outstanding_extents(inode, dio_data, len);
7680 btrfs_free_reserved_data_space(inode, start, len);
7681 WARN_ON(dio_data->reserve < len);
7682 dio_data->reserve -= len;
7683 current->journal_info = dio_data;
7687 * In the case of write we need to clear and unlock the entire range,
7688 * in the case of read we need to unlock only the end area that we
7689 * aren't using if there is any left over space.
7691 if (lockstart < lockend) {
7692 clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart,
7693 lockend, unlock_bits, 1, 0,
7694 &cached_state, GFP_NOFS);
7696 free_extent_state(cached_state);
7699 free_extent_map(em);
7704 clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend,
7705 unlock_bits, 1, 0, &cached_state, GFP_NOFS);
7708 current->journal_info = dio_data;
7710 * Compensate the delalloc release we do in btrfs_direct_IO() when we
7711 * write less data then expected, so that we don't underflow our inode's
7712 * outstanding extents counter.
7714 if (create && dio_data)
7715 adjust_dio_outstanding_extents(inode, dio_data, len);
7720 static inline int submit_dio_repair_bio(struct inode *inode, struct bio *bio,
7721 int rw, int mirror_num)
7723 struct btrfs_root *root = BTRFS_I(inode)->root;
7726 BUG_ON(rw & REQ_WRITE);
7730 ret = btrfs_bio_wq_end_io(root->fs_info, bio,
7731 BTRFS_WQ_ENDIO_DIO_REPAIR);
7735 ret = btrfs_map_bio(root, rw, bio, mirror_num, 0);
7741 static int btrfs_check_dio_repairable(struct inode *inode,
7742 struct bio *failed_bio,
7743 struct io_failure_record *failrec,
7748 num_copies = btrfs_num_copies(BTRFS_I(inode)->root->fs_info,
7749 failrec->logical, failrec->len);
7750 if (num_copies == 1) {
7752 * we only have a single copy of the data, so don't bother with
7753 * all the retry and error correction code that follows. no
7754 * matter what the error is, it is very likely to persist.
7756 pr_debug("Check DIO Repairable: cannot repair, num_copies=%d, next_mirror %d, failed_mirror %d\n",
7757 num_copies, failrec->this_mirror, failed_mirror);
7761 failrec->failed_mirror = failed_mirror;
7762 failrec->this_mirror++;
7763 if (failrec->this_mirror == failed_mirror)
7764 failrec->this_mirror++;
7766 if (failrec->this_mirror > num_copies) {
7767 pr_debug("Check DIO Repairable: (fail) num_copies=%d, next_mirror %d, failed_mirror %d\n",
7768 num_copies, failrec->this_mirror, failed_mirror);
7775 static int dio_read_error(struct inode *inode, struct bio *failed_bio,
7776 struct page *page, u64 start, u64 end,
7777 int failed_mirror, bio_end_io_t *repair_endio,
7780 struct io_failure_record *failrec;
7786 BUG_ON(failed_bio->bi_rw & REQ_WRITE);
7788 ret = btrfs_get_io_failure_record(inode, start, end, &failrec);
7792 ret = btrfs_check_dio_repairable(inode, failed_bio, failrec,
7795 free_io_failure(inode, failrec);
7799 if (failed_bio->bi_vcnt > 1)
7800 read_mode = READ_SYNC | REQ_FAILFAST_DEV;
7802 read_mode = READ_SYNC;
7804 isector = start - btrfs_io_bio(failed_bio)->logical;
7805 isector >>= inode->i_sb->s_blocksize_bits;
7806 bio = btrfs_create_repair_bio(inode, failed_bio, failrec, page,
7807 0, isector, repair_endio, repair_arg);
7809 free_io_failure(inode, failrec);
7813 btrfs_debug(BTRFS_I(inode)->root->fs_info,
7814 "Repair DIO Read Error: submitting new dio read[%#x] to this_mirror=%d, in_validation=%d\n",
7815 read_mode, failrec->this_mirror, failrec->in_validation);
7817 ret = submit_dio_repair_bio(inode, bio, read_mode,
7818 failrec->this_mirror);
7820 free_io_failure(inode, failrec);
7827 struct btrfs_retry_complete {
7828 struct completion done;
7829 struct inode *inode;
7834 static void btrfs_retry_endio_nocsum(struct bio *bio)
7836 struct btrfs_retry_complete *done = bio->bi_private;
7837 struct bio_vec *bvec;
7844 bio_for_each_segment_all(bvec, bio, i)
7845 clean_io_failure(done->inode, done->start, bvec->bv_page, 0);
7847 complete(&done->done);
7851 static int __btrfs_correct_data_nocsum(struct inode *inode,
7852 struct btrfs_io_bio *io_bio)
7854 struct bio_vec *bvec;
7855 struct btrfs_retry_complete done;
7860 start = io_bio->logical;
7863 bio_for_each_segment_all(bvec, &io_bio->bio, i) {
7867 init_completion(&done.done);
7869 ret = dio_read_error(inode, &io_bio->bio, bvec->bv_page, start,
7870 start + bvec->bv_len - 1,
7872 btrfs_retry_endio_nocsum, &done);
7876 wait_for_completion(&done.done);
7878 if (!done.uptodate) {
7879 /* We might have another mirror, so try again */
7883 start += bvec->bv_len;
7889 static void btrfs_retry_endio(struct bio *bio)
7891 struct btrfs_retry_complete *done = bio->bi_private;
7892 struct btrfs_io_bio *io_bio = btrfs_io_bio(bio);
7893 struct bio_vec *bvec;
7902 bio_for_each_segment_all(bvec, bio, i) {
7903 ret = __readpage_endio_check(done->inode, io_bio, i,
7905 done->start, bvec->bv_len);
7907 clean_io_failure(done->inode, done->start,
7913 done->uptodate = uptodate;
7915 complete(&done->done);
7919 static int __btrfs_subio_endio_read(struct inode *inode,
7920 struct btrfs_io_bio *io_bio, int err)
7922 struct bio_vec *bvec;
7923 struct btrfs_retry_complete done;
7930 start = io_bio->logical;
7933 bio_for_each_segment_all(bvec, &io_bio->bio, i) {
7934 ret = __readpage_endio_check(inode, io_bio, i, bvec->bv_page,
7935 0, start, bvec->bv_len);
7941 init_completion(&done.done);
7943 ret = dio_read_error(inode, &io_bio->bio, bvec->bv_page, start,
7944 start + bvec->bv_len - 1,
7946 btrfs_retry_endio, &done);
7952 wait_for_completion(&done.done);
7954 if (!done.uptodate) {
7955 /* We might have another mirror, so try again */
7959 offset += bvec->bv_len;
7960 start += bvec->bv_len;
7966 static int btrfs_subio_endio_read(struct inode *inode,
7967 struct btrfs_io_bio *io_bio, int err)
7969 bool skip_csum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
7973 return __btrfs_correct_data_nocsum(inode, io_bio);
7977 return __btrfs_subio_endio_read(inode, io_bio, err);
7981 static void btrfs_endio_direct_read(struct bio *bio)
7983 struct btrfs_dio_private *dip = bio->bi_private;
7984 struct inode *inode = dip->inode;
7985 struct bio *dio_bio;
7986 struct btrfs_io_bio *io_bio = btrfs_io_bio(bio);
7987 int err = bio->bi_error;
7989 if (dip->flags & BTRFS_DIO_ORIG_BIO_SUBMITTED)
7990 err = btrfs_subio_endio_read(inode, io_bio, err);
7992 unlock_extent(&BTRFS_I(inode)->io_tree, dip->logical_offset,
7993 dip->logical_offset + dip->bytes - 1);
7994 dio_bio = dip->dio_bio;
7998 dio_bio->bi_error = bio->bi_error;
7999 dio_end_io(dio_bio, bio->bi_error);
8002 io_bio->end_io(io_bio, err);
8006 static void btrfs_endio_direct_write(struct bio *bio)
8008 struct btrfs_dio_private *dip = bio->bi_private;
8009 struct inode *inode = dip->inode;
8010 struct btrfs_root *root = BTRFS_I(inode)->root;
8011 struct btrfs_ordered_extent *ordered = NULL;
8012 u64 ordered_offset = dip->logical_offset;
8013 u64 ordered_bytes = dip->bytes;
8014 struct bio *dio_bio;
8018 ret = btrfs_dec_test_first_ordered_pending(inode, &ordered,
8025 btrfs_init_work(&ordered->work, btrfs_endio_write_helper,
8026 finish_ordered_fn, NULL, NULL);
8027 btrfs_queue_work(root->fs_info->endio_write_workers,
8031 * our bio might span multiple ordered extents. If we haven't
8032 * completed the accounting for the whole dio, go back and try again
8034 if (ordered_offset < dip->logical_offset + dip->bytes) {
8035 ordered_bytes = dip->logical_offset + dip->bytes -
8040 dio_bio = dip->dio_bio;
8044 dio_bio->bi_error = bio->bi_error;
8045 dio_end_io(dio_bio, bio->bi_error);
8049 static int __btrfs_submit_bio_start_direct_io(struct inode *inode, int rw,
8050 struct bio *bio, int mirror_num,
8051 unsigned long bio_flags, u64 offset)
8054 struct btrfs_root *root = BTRFS_I(inode)->root;
8055 ret = btrfs_csum_one_bio(root, inode, bio, offset, 1);
8056 BUG_ON(ret); /* -ENOMEM */
8060 static void btrfs_end_dio_bio(struct bio *bio)
8062 struct btrfs_dio_private *dip = bio->bi_private;
8063 int err = bio->bi_error;
8066 btrfs_warn(BTRFS_I(dip->inode)->root->fs_info,
8067 "direct IO failed ino %llu rw %lu sector %#Lx len %u err no %d",
8068 btrfs_ino(dip->inode), bio->bi_rw,
8069 (unsigned long long)bio->bi_iter.bi_sector,
8070 bio->bi_iter.bi_size, err);
8072 if (dip->subio_endio)
8073 err = dip->subio_endio(dip->inode, btrfs_io_bio(bio), err);
8079 * before atomic variable goto zero, we must make sure
8080 * dip->errors is perceived to be set.
8082 smp_mb__before_atomic();
8085 /* if there are more bios still pending for this dio, just exit */
8086 if (!atomic_dec_and_test(&dip->pending_bios))
8090 bio_io_error(dip->orig_bio);
8092 dip->dio_bio->bi_error = 0;
8093 bio_endio(dip->orig_bio);
8099 static struct bio *btrfs_dio_bio_alloc(struct block_device *bdev,
8100 u64 first_sector, gfp_t gfp_flags)
8103 bio = btrfs_bio_alloc(bdev, first_sector, BIO_MAX_PAGES, gfp_flags);
8105 bio_associate_current(bio);
8109 static inline int btrfs_lookup_and_bind_dio_csum(struct btrfs_root *root,
8110 struct inode *inode,
8111 struct btrfs_dio_private *dip,
8115 struct btrfs_io_bio *io_bio = btrfs_io_bio(bio);
8116 struct btrfs_io_bio *orig_io_bio = btrfs_io_bio(dip->orig_bio);
8120 * We load all the csum data we need when we submit
8121 * the first bio to reduce the csum tree search and
8124 if (dip->logical_offset == file_offset) {
8125 ret = btrfs_lookup_bio_sums_dio(root, inode, dip->orig_bio,
8131 if (bio == dip->orig_bio)
8134 file_offset -= dip->logical_offset;
8135 file_offset >>= inode->i_sb->s_blocksize_bits;
8136 io_bio->csum = (u8 *)(((u32 *)orig_io_bio->csum) + file_offset);
8141 static inline int __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode,
8142 int rw, u64 file_offset, int skip_sum,
8145 struct btrfs_dio_private *dip = bio->bi_private;
8146 int write = rw & REQ_WRITE;
8147 struct btrfs_root *root = BTRFS_I(inode)->root;
8151 async_submit = !atomic_read(&BTRFS_I(inode)->sync_writers);
8156 ret = btrfs_bio_wq_end_io(root->fs_info, bio,
8157 BTRFS_WQ_ENDIO_DATA);
8165 if (write && async_submit) {
8166 ret = btrfs_wq_submit_bio(root->fs_info,
8167 inode, rw, bio, 0, 0,
8169 __btrfs_submit_bio_start_direct_io,
8170 __btrfs_submit_bio_done);
8174 * If we aren't doing async submit, calculate the csum of the
8177 ret = btrfs_csum_one_bio(root, inode, bio, file_offset, 1);
8181 ret = btrfs_lookup_and_bind_dio_csum(root, inode, dip, bio,
8187 ret = btrfs_map_bio(root, rw, bio, 0, async_submit);
8193 static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip,
8196 struct inode *inode = dip->inode;
8197 struct btrfs_root *root = BTRFS_I(inode)->root;
8199 struct bio *orig_bio = dip->orig_bio;
8200 struct bio_vec *bvec = orig_bio->bi_io_vec;
8201 u64 start_sector = orig_bio->bi_iter.bi_sector;
8202 u64 file_offset = dip->logical_offset;
8207 int async_submit = 0;
8209 map_length = orig_bio->bi_iter.bi_size;
8210 ret = btrfs_map_block(root->fs_info, rw, start_sector << 9,
8211 &map_length, NULL, 0);
8215 if (map_length >= orig_bio->bi_iter.bi_size) {
8217 dip->flags |= BTRFS_DIO_ORIG_BIO_SUBMITTED;
8221 /* async crcs make it difficult to collect full stripe writes. */
8222 if (btrfs_get_alloc_profile(root, 1) & BTRFS_BLOCK_GROUP_RAID56_MASK)
8227 bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, start_sector, GFP_NOFS);
8231 bio->bi_private = dip;
8232 bio->bi_end_io = btrfs_end_dio_bio;
8233 btrfs_io_bio(bio)->logical = file_offset;
8234 atomic_inc(&dip->pending_bios);
8236 while (bvec <= (orig_bio->bi_io_vec + orig_bio->bi_vcnt - 1)) {
8237 if (map_length < submit_len + bvec->bv_len ||
8238 bio_add_page(bio, bvec->bv_page, bvec->bv_len,
8239 bvec->bv_offset) < bvec->bv_len) {
8241 * inc the count before we submit the bio so
8242 * we know the end IO handler won't happen before
8243 * we inc the count. Otherwise, the dip might get freed
8244 * before we're done setting it up
8246 atomic_inc(&dip->pending_bios);
8247 ret = __btrfs_submit_dio_bio(bio, inode, rw,
8248 file_offset, skip_sum,
8252 atomic_dec(&dip->pending_bios);
8256 start_sector += submit_len >> 9;
8257 file_offset += submit_len;
8262 bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev,
8263 start_sector, GFP_NOFS);
8266 bio->bi_private = dip;
8267 bio->bi_end_io = btrfs_end_dio_bio;
8268 btrfs_io_bio(bio)->logical = file_offset;
8270 map_length = orig_bio->bi_iter.bi_size;
8271 ret = btrfs_map_block(root->fs_info, rw,
8273 &map_length, NULL, 0);
8279 submit_len += bvec->bv_len;
8286 ret = __btrfs_submit_dio_bio(bio, inode, rw, file_offset, skip_sum,
8295 * before atomic variable goto zero, we must
8296 * make sure dip->errors is perceived to be set.
8298 smp_mb__before_atomic();
8299 if (atomic_dec_and_test(&dip->pending_bios))
8300 bio_io_error(dip->orig_bio);
8302 /* bio_end_io() will handle error, so we needn't return it */
8306 static void btrfs_submit_direct(int rw, struct bio *dio_bio,
8307 struct inode *inode, loff_t file_offset)
8309 struct btrfs_dio_private *dip = NULL;
8310 struct bio *io_bio = NULL;
8311 struct btrfs_io_bio *btrfs_bio;
8313 int write = rw & REQ_WRITE;
8316 skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
8318 io_bio = btrfs_bio_clone(dio_bio, GFP_NOFS);
8324 dip = kzalloc(sizeof(*dip), GFP_NOFS);
8330 dip->private = dio_bio->bi_private;
8332 dip->logical_offset = file_offset;
8333 dip->bytes = dio_bio->bi_iter.bi_size;
8334 dip->disk_bytenr = (u64)dio_bio->bi_iter.bi_sector << 9;
8335 io_bio->bi_private = dip;
8336 dip->orig_bio = io_bio;
8337 dip->dio_bio = dio_bio;
8338 atomic_set(&dip->pending_bios, 0);
8339 btrfs_bio = btrfs_io_bio(io_bio);
8340 btrfs_bio->logical = file_offset;
8343 io_bio->bi_end_io = btrfs_endio_direct_write;
8345 io_bio->bi_end_io = btrfs_endio_direct_read;
8346 dip->subio_endio = btrfs_subio_endio_read;
8349 ret = btrfs_submit_direct_hook(rw, dip, skip_sum);
8353 if (btrfs_bio->end_io)
8354 btrfs_bio->end_io(btrfs_bio, ret);
8358 * If we arrived here it means either we failed to submit the dip
8359 * or we either failed to clone the dio_bio or failed to allocate the
8360 * dip. If we cloned the dio_bio and allocated the dip, we can just
8361 * call bio_endio against our io_bio so that we get proper resource
8362 * cleanup if we fail to submit the dip, otherwise, we must do the
8363 * same as btrfs_endio_direct_[write|read] because we can't call these
8364 * callbacks - they require an allocated dip and a clone of dio_bio.
8366 if (io_bio && dip) {
8367 io_bio->bi_error = -EIO;
8370 * The end io callbacks free our dip, do the final put on io_bio
8371 * and all the cleanup and final put for dio_bio (through
8378 struct btrfs_ordered_extent *ordered;
8380 ordered = btrfs_lookup_ordered_extent(inode,
8382 set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
8384 * Decrements our ref on the ordered extent and removes
8385 * the ordered extent from the inode's ordered tree,
8386 * doing all the proper resource cleanup such as for the
8387 * reserved space and waking up any waiters for this
8388 * ordered extent (through btrfs_remove_ordered_extent).
8390 btrfs_finish_ordered_io(ordered);
8392 unlock_extent(&BTRFS_I(inode)->io_tree, file_offset,
8393 file_offset + dio_bio->bi_iter.bi_size - 1);
8395 dio_bio->bi_error = -EIO;
8397 * Releases and cleans up our dio_bio, no need to bio_put()
8398 * nor bio_endio()/bio_io_error() against dio_bio.
8400 dio_end_io(dio_bio, ret);
8407 static ssize_t check_direct_IO(struct btrfs_root *root, struct kiocb *iocb,
8408 const struct iov_iter *iter, loff_t offset)
8412 unsigned blocksize_mask = root->sectorsize - 1;
8413 ssize_t retval = -EINVAL;
8415 if (offset & blocksize_mask)
8418 if (iov_iter_alignment(iter) & blocksize_mask)
8421 /* If this is a write we don't need to check anymore */
8422 if (iov_iter_rw(iter) == WRITE)
8425 * Check to make sure we don't have duplicate iov_base's in this
8426 * iovec, if so return EINVAL, otherwise we'll get csum errors
8427 * when reading back.
8429 for (seg = 0; seg < iter->nr_segs; seg++) {
8430 for (i = seg + 1; i < iter->nr_segs; i++) {
8431 if (iter->iov[seg].iov_base == iter->iov[i].iov_base)
8440 static ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
8443 struct file *file = iocb->ki_filp;
8444 struct inode *inode = file->f_mapping->host;
8445 struct btrfs_root *root = BTRFS_I(inode)->root;
8446 struct btrfs_dio_data dio_data = { 0 };
8450 bool relock = false;
8453 if (check_direct_IO(BTRFS_I(inode)->root, iocb, iter, offset))
8456 inode_dio_begin(inode);
8457 smp_mb__after_atomic();
8460 * The generic stuff only does filemap_write_and_wait_range, which
8461 * isn't enough if we've written compressed pages to this area, so
8462 * we need to flush the dirty pages again to make absolutely sure
8463 * that any outstanding dirty pages are on disk.
8465 count = iov_iter_count(iter);
8466 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
8467 &BTRFS_I(inode)->runtime_flags))
8468 filemap_fdatawrite_range(inode->i_mapping, offset,
8469 offset + count - 1);
8471 if (iov_iter_rw(iter) == WRITE) {
8473 * If the write DIO is beyond the EOF, we need update
8474 * the isize, but it is protected by i_mutex. So we can
8475 * not unlock the i_mutex at this case.
8477 if (offset + count <= inode->i_size) {
8478 mutex_unlock(&inode->i_mutex);
8481 ret = btrfs_delalloc_reserve_space(inode, offset, count);
8484 dio_data.outstanding_extents = div64_u64(count +
8485 BTRFS_MAX_EXTENT_SIZE - 1,
8486 BTRFS_MAX_EXTENT_SIZE);
8489 * We need to know how many extents we reserved so that we can
8490 * do the accounting properly if we go over the number we
8491 * originally calculated. Abuse current->journal_info for this.
8493 dio_data.reserve = round_up(count, root->sectorsize);
8494 current->journal_info = &dio_data;
8495 } else if (test_bit(BTRFS_INODE_READDIO_NEED_LOCK,
8496 &BTRFS_I(inode)->runtime_flags)) {
8497 inode_dio_end(inode);
8498 flags = DIO_LOCKING | DIO_SKIP_HOLES;
8502 ret = __blockdev_direct_IO(iocb, inode,
8503 BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev,
8504 iter, offset, btrfs_get_blocks_direct, NULL,
8505 btrfs_submit_direct, flags);
8506 if (iov_iter_rw(iter) == WRITE) {
8507 current->journal_info = NULL;
8508 if (ret < 0 && ret != -EIOCBQUEUED) {
8509 if (dio_data.reserve)
8510 btrfs_delalloc_release_space(inode, offset,
8512 } else if (ret >= 0 && (size_t)ret < count)
8513 btrfs_delalloc_release_space(inode, offset,
8514 count - (size_t)ret);
8518 inode_dio_end(inode);
8520 mutex_lock(&inode->i_mutex);
8525 #define BTRFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC)
8527 static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
8528 __u64 start, __u64 len)
8532 ret = fiemap_check_flags(fieinfo, BTRFS_FIEMAP_FLAGS);
8536 return extent_fiemap(inode, fieinfo, start, len, btrfs_get_extent_fiemap);
8539 int btrfs_readpage(struct file *file, struct page *page)
8541 struct extent_io_tree *tree;
8542 tree = &BTRFS_I(page->mapping->host)->io_tree;
8543 return extent_read_full_page(tree, page, btrfs_get_extent, 0);
8546 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
8548 struct extent_io_tree *tree;
8549 struct inode *inode = page->mapping->host;
8552 if (current->flags & PF_MEMALLOC) {
8553 redirty_page_for_writepage(wbc, page);
8559 * If we are under memory pressure we will call this directly from the
8560 * VM, we need to make sure we have the inode referenced for the ordered
8561 * extent. If not just return like we didn't do anything.
8563 if (!igrab(inode)) {
8564 redirty_page_for_writepage(wbc, page);
8565 return AOP_WRITEPAGE_ACTIVATE;
8567 tree = &BTRFS_I(page->mapping->host)->io_tree;
8568 ret = extent_write_full_page(tree, page, btrfs_get_extent, wbc);
8569 btrfs_add_delayed_iput(inode);
8573 static int btrfs_writepages(struct address_space *mapping,
8574 struct writeback_control *wbc)
8576 struct extent_io_tree *tree;
8578 tree = &BTRFS_I(mapping->host)->io_tree;
8579 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
8583 btrfs_readpages(struct file *file, struct address_space *mapping,
8584 struct list_head *pages, unsigned nr_pages)
8586 struct extent_io_tree *tree;
8587 tree = &BTRFS_I(mapping->host)->io_tree;
8588 return extent_readpages(tree, mapping, pages, nr_pages,
8591 static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags)
8593 struct extent_io_tree *tree;
8594 struct extent_map_tree *map;
8597 tree = &BTRFS_I(page->mapping->host)->io_tree;
8598 map = &BTRFS_I(page->mapping->host)->extent_tree;
8599 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
8601 ClearPagePrivate(page);
8602 set_page_private(page, 0);
8603 page_cache_release(page);
8608 static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
8610 if (PageWriteback(page) || PageDirty(page))
8612 return __btrfs_releasepage(page, gfp_flags & GFP_NOFS);
8615 static void btrfs_invalidatepage(struct page *page, unsigned int offset,
8616 unsigned int length)
8618 struct inode *inode = page->mapping->host;
8619 struct extent_io_tree *tree;
8620 struct btrfs_ordered_extent *ordered;
8621 struct extent_state *cached_state = NULL;
8622 u64 page_start = page_offset(page);
8623 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
8624 int inode_evicting = inode->i_state & I_FREEING;
8627 * we have the page locked, so new writeback can't start,
8628 * and the dirty bit won't be cleared while we are here.
8630 * Wait for IO on this page so that we can safely clear
8631 * the PagePrivate2 bit and do ordered accounting
8633 wait_on_page_writeback(page);
8635 tree = &BTRFS_I(inode)->io_tree;
8637 btrfs_releasepage(page, GFP_NOFS);
8641 if (!inode_evicting)
8642 lock_extent_bits(tree, page_start, page_end, 0, &cached_state);
8643 ordered = btrfs_lookup_ordered_extent(inode, page_start);
8646 * IO on this page will never be started, so we need
8647 * to account for any ordered extents now
8649 if (!inode_evicting)
8650 clear_extent_bit(tree, page_start, page_end,
8651 EXTENT_DIRTY | EXTENT_DELALLOC |
8652 EXTENT_LOCKED | EXTENT_DO_ACCOUNTING |
8653 EXTENT_DEFRAG, 1, 0, &cached_state,
8656 * whoever cleared the private bit is responsible
8657 * for the finish_ordered_io
8659 if (TestClearPagePrivate2(page)) {
8660 struct btrfs_ordered_inode_tree *tree;
8663 tree = &BTRFS_I(inode)->ordered_tree;
8665 spin_lock_irq(&tree->lock);
8666 set_bit(BTRFS_ORDERED_TRUNCATED, &ordered->flags);
8667 new_len = page_start - ordered->file_offset;
8668 if (new_len < ordered->truncated_len)
8669 ordered->truncated_len = new_len;
8670 spin_unlock_irq(&tree->lock);
8672 if (btrfs_dec_test_ordered_pending(inode, &ordered,
8674 PAGE_CACHE_SIZE, 1))
8675 btrfs_finish_ordered_io(ordered);
8677 btrfs_put_ordered_extent(ordered);
8678 if (!inode_evicting) {
8679 cached_state = NULL;
8680 lock_extent_bits(tree, page_start, page_end, 0,
8686 * Qgroup reserved space handler
8687 * Page here will be either
8688 * 1) Already written to disk
8689 * In this case, its reserved space is released from data rsv map
8690 * and will be freed by delayed_ref handler finally.
8691 * So even we call qgroup_free_data(), it won't decrease reserved
8693 * 2) Not written to disk
8694 * This means the reserved space should be freed here.
8696 btrfs_qgroup_free_data(inode, page_start, PAGE_CACHE_SIZE);
8697 if (!inode_evicting) {
8698 clear_extent_bit(tree, page_start, page_end,
8699 EXTENT_LOCKED | EXTENT_DIRTY |
8700 EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING |
8701 EXTENT_DEFRAG, 1, 1,
8702 &cached_state, GFP_NOFS);
8704 __btrfs_releasepage(page, GFP_NOFS);
8707 ClearPageChecked(page);
8708 if (PagePrivate(page)) {
8709 ClearPagePrivate(page);
8710 set_page_private(page, 0);
8711 page_cache_release(page);
8716 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
8717 * called from a page fault handler when a page is first dirtied. Hence we must
8718 * be careful to check for EOF conditions here. We set the page up correctly
8719 * for a written page which means we get ENOSPC checking when writing into
8720 * holes and correct delalloc and unwritten extent mapping on filesystems that
8721 * support these features.
8723 * We are not allowed to take the i_mutex here so we have to play games to
8724 * protect against truncate races as the page could now be beyond EOF. Because
8725 * vmtruncate() writes the inode size before removing pages, once we have the
8726 * page lock we can determine safely if the page is beyond EOF. If it is not
8727 * beyond EOF, then the page is guaranteed safe against truncation until we
8730 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
8732 struct page *page = vmf->page;
8733 struct inode *inode = file_inode(vma->vm_file);
8734 struct btrfs_root *root = BTRFS_I(inode)->root;
8735 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
8736 struct btrfs_ordered_extent *ordered;
8737 struct extent_state *cached_state = NULL;
8739 unsigned long zero_start;
8746 sb_start_pagefault(inode->i_sb);
8747 page_start = page_offset(page);
8748 page_end = page_start + PAGE_CACHE_SIZE - 1;
8750 ret = btrfs_delalloc_reserve_space(inode, page_start,
8753 ret = file_update_time(vma->vm_file);
8759 else /* -ENOSPC, -EIO, etc */
8760 ret = VM_FAULT_SIGBUS;
8766 ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */
8769 size = i_size_read(inode);
8771 if ((page->mapping != inode->i_mapping) ||
8772 (page_start >= size)) {
8773 /* page got truncated out from underneath us */
8776 wait_on_page_writeback(page);
8778 lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state);
8779 set_page_extent_mapped(page);
8782 * we can't set the delalloc bits if there are pending ordered
8783 * extents. Drop our locks and wait for them to finish
8785 ordered = btrfs_lookup_ordered_extent(inode, page_start);
8787 unlock_extent_cached(io_tree, page_start, page_end,
8788 &cached_state, GFP_NOFS);
8790 btrfs_start_ordered_extent(inode, ordered, 1);
8791 btrfs_put_ordered_extent(ordered);
8796 * XXX - page_mkwrite gets called every time the page is dirtied, even
8797 * if it was already dirty, so for space accounting reasons we need to
8798 * clear any delalloc bits for the range we are fixing to save. There
8799 * is probably a better way to do this, but for now keep consistent with
8800 * prepare_pages in the normal write path.
8802 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end,
8803 EXTENT_DIRTY | EXTENT_DELALLOC |
8804 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG,
8805 0, 0, &cached_state, GFP_NOFS);
8807 ret = btrfs_set_extent_delalloc(inode, page_start, page_end,
8810 unlock_extent_cached(io_tree, page_start, page_end,
8811 &cached_state, GFP_NOFS);
8812 ret = VM_FAULT_SIGBUS;
8817 /* page is wholly or partially inside EOF */
8818 if (page_start + PAGE_CACHE_SIZE > size)
8819 zero_start = size & ~PAGE_CACHE_MASK;
8821 zero_start = PAGE_CACHE_SIZE;
8823 if (zero_start != PAGE_CACHE_SIZE) {
8825 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
8826 flush_dcache_page(page);
8829 ClearPageChecked(page);
8830 set_page_dirty(page);
8831 SetPageUptodate(page);
8833 BTRFS_I(inode)->last_trans = root->fs_info->generation;
8834 BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
8835 BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
8837 unlock_extent_cached(io_tree, page_start, page_end, &cached_state, GFP_NOFS);
8841 sb_end_pagefault(inode->i_sb);
8842 return VM_FAULT_LOCKED;
8846 btrfs_delalloc_release_space(inode, page_start, PAGE_CACHE_SIZE);
8848 sb_end_pagefault(inode->i_sb);
8852 static int btrfs_truncate(struct inode *inode)
8854 struct btrfs_root *root = BTRFS_I(inode)->root;
8855 struct btrfs_block_rsv *rsv;
8858 struct btrfs_trans_handle *trans;
8859 u64 mask = root->sectorsize - 1;
8860 u64 min_size = btrfs_calc_trunc_metadata_size(root, 1);
8862 ret = btrfs_wait_ordered_range(inode, inode->i_size & (~mask),
8868 * Yes ladies and gentelment, this is indeed ugly. The fact is we have
8869 * 3 things going on here
8871 * 1) We need to reserve space for our orphan item and the space to
8872 * delete our orphan item. Lord knows we don't want to have a dangling
8873 * orphan item because we didn't reserve space to remove it.
8875 * 2) We need to reserve space to update our inode.
8877 * 3) We need to have something to cache all the space that is going to
8878 * be free'd up by the truncate operation, but also have some slack
8879 * space reserved in case it uses space during the truncate (thank you
8880 * very much snapshotting).
8882 * And we need these to all be seperate. The fact is we can use alot of
8883 * space doing the truncate, and we have no earthly idea how much space
8884 * we will use, so we need the truncate reservation to be seperate so it
8885 * doesn't end up using space reserved for updating the inode or
8886 * removing the orphan item. We also need to be able to stop the
8887 * transaction and start a new one, which means we need to be able to
8888 * update the inode several times, and we have no idea of knowing how
8889 * many times that will be, so we can't just reserve 1 item for the
8890 * entirety of the opration, so that has to be done seperately as well.
8891 * Then there is the orphan item, which does indeed need to be held on
8892 * to for the whole operation, and we need nobody to touch this reserved
8893 * space except the orphan code.
8895 * So that leaves us with
8897 * 1) root->orphan_block_rsv - for the orphan deletion.
8898 * 2) rsv - for the truncate reservation, which we will steal from the
8899 * transaction reservation.
8900 * 3) fs_info->trans_block_rsv - this will have 1 items worth left for
8901 * updating the inode.
8903 rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP);
8906 rsv->size = min_size;
8910 * 1 for the truncate slack space
8911 * 1 for updating the inode.
8913 trans = btrfs_start_transaction(root, 2);
8914 if (IS_ERR(trans)) {
8915 err = PTR_ERR(trans);
8919 /* Migrate the slack space for the truncate to our reserve */
8920 ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, rsv,
8925 * So if we truncate and then write and fsync we normally would just
8926 * write the extents that changed, which is a problem if we need to
8927 * first truncate that entire inode. So set this flag so we write out
8928 * all of the extents in the inode to the sync log so we're completely
8931 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags);
8932 trans->block_rsv = rsv;
8935 ret = btrfs_truncate_inode_items(trans, root, inode,
8937 BTRFS_EXTENT_DATA_KEY);
8938 if (ret != -ENOSPC && ret != -EAGAIN) {
8943 trans->block_rsv = &root->fs_info->trans_block_rsv;
8944 ret = btrfs_update_inode(trans, root, inode);
8950 btrfs_end_transaction(trans, root);
8951 btrfs_btree_balance_dirty(root);
8953 trans = btrfs_start_transaction(root, 2);
8954 if (IS_ERR(trans)) {
8955 ret = err = PTR_ERR(trans);
8960 ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv,
8962 BUG_ON(ret); /* shouldn't happen */
8963 trans->block_rsv = rsv;
8966 if (ret == 0 && inode->i_nlink > 0) {
8967 trans->block_rsv = root->orphan_block_rsv;
8968 ret = btrfs_orphan_del(trans, inode);
8974 trans->block_rsv = &root->fs_info->trans_block_rsv;
8975 ret = btrfs_update_inode(trans, root, inode);
8979 ret = btrfs_end_transaction(trans, root);
8980 btrfs_btree_balance_dirty(root);
8984 btrfs_free_block_rsv(root, rsv);
8993 * create a new subvolume directory/inode (helper for the ioctl).
8995 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
8996 struct btrfs_root *new_root,
8997 struct btrfs_root *parent_root,
9000 struct inode *inode;
9004 inode = btrfs_new_inode(trans, new_root, NULL, "..", 2,
9005 new_dirid, new_dirid,
9006 S_IFDIR | (~current_umask() & S_IRWXUGO),
9009 return PTR_ERR(inode);
9010 inode->i_op = &btrfs_dir_inode_operations;
9011 inode->i_fop = &btrfs_dir_file_operations;
9013 set_nlink(inode, 1);
9014 btrfs_i_size_write(inode, 0);
9015 unlock_new_inode(inode);
9017 err = btrfs_subvol_inherit_props(trans, new_root, parent_root);
9019 btrfs_err(new_root->fs_info,
9020 "error inheriting subvolume %llu properties: %d",
9021 new_root->root_key.objectid, err);
9023 err = btrfs_update_inode(trans, new_root, inode);
9029 struct inode *btrfs_alloc_inode(struct super_block *sb)
9031 struct btrfs_inode *ei;
9032 struct inode *inode;
9034 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
9041 ei->last_sub_trans = 0;
9042 ei->logged_trans = 0;
9043 ei->delalloc_bytes = 0;
9044 ei->defrag_bytes = 0;
9045 ei->disk_i_size = 0;
9048 ei->index_cnt = (u64)-1;
9050 ei->last_unlink_trans = 0;
9051 ei->last_log_commit = 0;
9053 spin_lock_init(&ei->lock);
9054 ei->outstanding_extents = 0;
9055 ei->reserved_extents = 0;
9057 ei->runtime_flags = 0;
9058 ei->force_compress = BTRFS_COMPRESS_NONE;
9060 ei->delayed_node = NULL;
9062 ei->i_otime.tv_sec = 0;
9063 ei->i_otime.tv_nsec = 0;
9065 inode = &ei->vfs_inode;
9066 extent_map_tree_init(&ei->extent_tree);
9067 extent_io_tree_init(&ei->io_tree, &inode->i_data);
9068 extent_io_tree_init(&ei->io_failure_tree, &inode->i_data);
9069 ei->io_tree.track_uptodate = 1;
9070 ei->io_failure_tree.track_uptodate = 1;
9071 atomic_set(&ei->sync_writers, 0);
9072 mutex_init(&ei->log_mutex);
9073 mutex_init(&ei->delalloc_mutex);
9074 btrfs_ordered_inode_tree_init(&ei->ordered_tree);
9075 INIT_LIST_HEAD(&ei->delalloc_inodes);
9076 RB_CLEAR_NODE(&ei->rb_node);
9081 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
9082 void btrfs_test_destroy_inode(struct inode *inode)
9084 btrfs_drop_extent_cache(inode, 0, (u64)-1, 0);
9085 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
9089 static void btrfs_i_callback(struct rcu_head *head)
9091 struct inode *inode = container_of(head, struct inode, i_rcu);
9092 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
9095 void btrfs_destroy_inode(struct inode *inode)
9097 struct btrfs_ordered_extent *ordered;
9098 struct btrfs_root *root = BTRFS_I(inode)->root;
9100 WARN_ON(!hlist_empty(&inode->i_dentry));
9101 WARN_ON(inode->i_data.nrpages);
9102 WARN_ON(BTRFS_I(inode)->outstanding_extents);
9103 WARN_ON(BTRFS_I(inode)->reserved_extents);
9104 WARN_ON(BTRFS_I(inode)->delalloc_bytes);
9105 WARN_ON(BTRFS_I(inode)->csum_bytes);
9106 WARN_ON(BTRFS_I(inode)->defrag_bytes);
9109 * This can happen where we create an inode, but somebody else also
9110 * created the same inode and we need to destroy the one we already
9116 if (test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM,
9117 &BTRFS_I(inode)->runtime_flags)) {
9118 btrfs_info(root->fs_info, "inode %llu still on the orphan list",
9120 atomic_dec(&root->orphan_inodes);
9124 ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1);
9128 btrfs_err(root->fs_info, "found ordered extent %llu %llu on inode cleanup",
9129 ordered->file_offset, ordered->len);
9130 btrfs_remove_ordered_extent(inode, ordered);
9131 btrfs_put_ordered_extent(ordered);
9132 btrfs_put_ordered_extent(ordered);
9135 btrfs_qgroup_check_reserved_leak(inode);
9136 inode_tree_del(inode);
9137 btrfs_drop_extent_cache(inode, 0, (u64)-1, 0);
9139 call_rcu(&inode->i_rcu, btrfs_i_callback);
9142 int btrfs_drop_inode(struct inode *inode)
9144 struct btrfs_root *root = BTRFS_I(inode)->root;
9149 /* the snap/subvol tree is on deleting */
9150 if (btrfs_root_refs(&root->root_item) == 0)
9153 return generic_drop_inode(inode);
9156 static void init_once(void *foo)
9158 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
9160 inode_init_once(&ei->vfs_inode);
9163 void btrfs_destroy_cachep(void)
9166 * Make sure all delayed rcu free inodes are flushed before we
9170 if (btrfs_inode_cachep)
9171 kmem_cache_destroy(btrfs_inode_cachep);
9172 if (btrfs_trans_handle_cachep)
9173 kmem_cache_destroy(btrfs_trans_handle_cachep);
9174 if (btrfs_transaction_cachep)
9175 kmem_cache_destroy(btrfs_transaction_cachep);
9176 if (btrfs_path_cachep)
9177 kmem_cache_destroy(btrfs_path_cachep);
9178 if (btrfs_free_space_cachep)
9179 kmem_cache_destroy(btrfs_free_space_cachep);
9180 if (btrfs_delalloc_work_cachep)
9181 kmem_cache_destroy(btrfs_delalloc_work_cachep);
9184 int btrfs_init_cachep(void)
9186 btrfs_inode_cachep = kmem_cache_create("btrfs_inode",
9187 sizeof(struct btrfs_inode), 0,
9188 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, init_once);
9189 if (!btrfs_inode_cachep)
9192 btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle",
9193 sizeof(struct btrfs_trans_handle), 0,
9194 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL);
9195 if (!btrfs_trans_handle_cachep)
9198 btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction",
9199 sizeof(struct btrfs_transaction), 0,
9200 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL);
9201 if (!btrfs_transaction_cachep)
9204 btrfs_path_cachep = kmem_cache_create("btrfs_path",
9205 sizeof(struct btrfs_path), 0,
9206 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL);
9207 if (!btrfs_path_cachep)
9210 btrfs_free_space_cachep = kmem_cache_create("btrfs_free_space",
9211 sizeof(struct btrfs_free_space), 0,
9212 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL);
9213 if (!btrfs_free_space_cachep)
9216 btrfs_delalloc_work_cachep = kmem_cache_create("btrfs_delalloc_work",
9217 sizeof(struct btrfs_delalloc_work), 0,
9218 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
9220 if (!btrfs_delalloc_work_cachep)
9225 btrfs_destroy_cachep();
9229 static int btrfs_getattr(struct vfsmount *mnt,
9230 struct dentry *dentry, struct kstat *stat)
9233 struct inode *inode = d_inode(dentry);
9234 u32 blocksize = inode->i_sb->s_blocksize;
9236 generic_fillattr(inode, stat);
9237 stat->dev = BTRFS_I(inode)->root->anon_dev;
9238 stat->blksize = PAGE_CACHE_SIZE;
9240 spin_lock(&BTRFS_I(inode)->lock);
9241 delalloc_bytes = BTRFS_I(inode)->delalloc_bytes;
9242 spin_unlock(&BTRFS_I(inode)->lock);
9243 stat->blocks = (ALIGN(inode_get_bytes(inode), blocksize) +
9244 ALIGN(delalloc_bytes, blocksize)) >> 9;
9248 static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
9249 struct inode *new_dir, struct dentry *new_dentry)
9251 struct btrfs_trans_handle *trans;
9252 struct btrfs_root *root = BTRFS_I(old_dir)->root;
9253 struct btrfs_root *dest = BTRFS_I(new_dir)->root;
9254 struct inode *new_inode = d_inode(new_dentry);
9255 struct inode *old_inode = d_inode(old_dentry);
9256 struct timespec ctime = CURRENT_TIME;
9260 u64 old_ino = btrfs_ino(old_inode);
9262 if (btrfs_ino(new_dir) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)
9265 /* we only allow rename subvolume link between subvolumes */
9266 if (old_ino != BTRFS_FIRST_FREE_OBJECTID && root != dest)
9269 if (old_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID ||
9270 (new_inode && btrfs_ino(new_inode) == BTRFS_FIRST_FREE_OBJECTID))
9273 if (S_ISDIR(old_inode->i_mode) && new_inode &&
9274 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE)
9278 /* check for collisions, even if the name isn't there */
9279 ret = btrfs_check_dir_item_collision(dest, new_dir->i_ino,
9280 new_dentry->d_name.name,
9281 new_dentry->d_name.len);
9284 if (ret == -EEXIST) {
9286 * eexist without a new_inode */
9287 if (WARN_ON(!new_inode)) {
9291 /* maybe -EOVERFLOW */
9298 * we're using rename to replace one file with another. Start IO on it
9299 * now so we don't add too much work to the end of the transaction
9301 if (new_inode && S_ISREG(old_inode->i_mode) && new_inode->i_size)
9302 filemap_flush(old_inode->i_mapping);
9304 /* close the racy window with snapshot create/destroy ioctl */
9305 if (old_ino == BTRFS_FIRST_FREE_OBJECTID)
9306 down_read(&root->fs_info->subvol_sem);
9308 * We want to reserve the absolute worst case amount of items. So if
9309 * both inodes are subvols and we need to unlink them then that would
9310 * require 4 item modifications, but if they are both normal inodes it
9311 * would require 5 item modifications, so we'll assume their normal
9312 * inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items
9313 * should cover the worst case number of items we'll modify.
9315 trans = btrfs_start_transaction(root, 11);
9316 if (IS_ERR(trans)) {
9317 ret = PTR_ERR(trans);
9322 btrfs_record_root_in_trans(trans, dest);
9324 ret = btrfs_set_inode_index(new_dir, &index);
9328 BTRFS_I(old_inode)->dir_index = 0ULL;
9329 if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) {
9330 /* force full log commit if subvolume involved. */
9331 btrfs_set_log_full_commit(root->fs_info, trans);
9333 ret = btrfs_insert_inode_ref(trans, dest,
9334 new_dentry->d_name.name,
9335 new_dentry->d_name.len,
9337 btrfs_ino(new_dir), index);
9341 * this is an ugly little race, but the rename is required
9342 * to make sure that if we crash, the inode is either at the
9343 * old name or the new one. pinning the log transaction lets
9344 * us make sure we don't allow a log commit to come in after
9345 * we unlink the name but before we add the new name back in.
9347 btrfs_pin_log_trans(root);
9350 inode_inc_iversion(old_dir);
9351 inode_inc_iversion(new_dir);
9352 inode_inc_iversion(old_inode);
9353 old_dir->i_ctime = old_dir->i_mtime = ctime;
9354 new_dir->i_ctime = new_dir->i_mtime = ctime;
9355 old_inode->i_ctime = ctime;
9357 if (old_dentry->d_parent != new_dentry->d_parent)
9358 btrfs_record_unlink_dir(trans, old_dir, old_inode, 1);
9360 if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) {
9361 root_objectid = BTRFS_I(old_inode)->root->root_key.objectid;
9362 ret = btrfs_unlink_subvol(trans, root, old_dir, root_objectid,
9363 old_dentry->d_name.name,
9364 old_dentry->d_name.len);
9366 ret = __btrfs_unlink_inode(trans, root, old_dir,
9367 d_inode(old_dentry),
9368 old_dentry->d_name.name,
9369 old_dentry->d_name.len);
9371 ret = btrfs_update_inode(trans, root, old_inode);
9374 btrfs_abort_transaction(trans, root, ret);
9379 inode_inc_iversion(new_inode);
9380 new_inode->i_ctime = CURRENT_TIME;
9381 if (unlikely(btrfs_ino(new_inode) ==
9382 BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) {
9383 root_objectid = BTRFS_I(new_inode)->location.objectid;
9384 ret = btrfs_unlink_subvol(trans, dest, new_dir,
9386 new_dentry->d_name.name,
9387 new_dentry->d_name.len);
9388 BUG_ON(new_inode->i_nlink == 0);
9390 ret = btrfs_unlink_inode(trans, dest, new_dir,
9391 d_inode(new_dentry),
9392 new_dentry->d_name.name,
9393 new_dentry->d_name.len);
9395 if (!ret && new_inode->i_nlink == 0)
9396 ret = btrfs_orphan_add(trans, d_inode(new_dentry));
9398 btrfs_abort_transaction(trans, root, ret);
9403 ret = btrfs_add_link(trans, new_dir, old_inode,
9404 new_dentry->d_name.name,
9405 new_dentry->d_name.len, 0, index);
9407 btrfs_abort_transaction(trans, root, ret);
9411 if (old_inode->i_nlink == 1)
9412 BTRFS_I(old_inode)->dir_index = index;
9414 if (old_ino != BTRFS_FIRST_FREE_OBJECTID) {
9415 struct dentry *parent = new_dentry->d_parent;
9416 btrfs_log_new_name(trans, old_inode, old_dir, parent);
9417 btrfs_end_log_trans(root);
9420 btrfs_end_transaction(trans, root);
9422 if (old_ino == BTRFS_FIRST_FREE_OBJECTID)
9423 up_read(&root->fs_info->subvol_sem);
9428 static int btrfs_rename2(struct inode *old_dir, struct dentry *old_dentry,
9429 struct inode *new_dir, struct dentry *new_dentry,
9432 if (flags & ~RENAME_NOREPLACE)
9435 return btrfs_rename(old_dir, old_dentry, new_dir, new_dentry);
9438 static void btrfs_run_delalloc_work(struct btrfs_work *work)
9440 struct btrfs_delalloc_work *delalloc_work;
9441 struct inode *inode;
9443 delalloc_work = container_of(work, struct btrfs_delalloc_work,
9445 inode = delalloc_work->inode;
9446 if (delalloc_work->wait) {
9447 btrfs_wait_ordered_range(inode, 0, (u64)-1);
9449 filemap_flush(inode->i_mapping);
9450 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
9451 &BTRFS_I(inode)->runtime_flags))
9452 filemap_flush(inode->i_mapping);
9455 if (delalloc_work->delay_iput)
9456 btrfs_add_delayed_iput(inode);
9459 complete(&delalloc_work->completion);
9462 struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode,
9463 int wait, int delay_iput)
9465 struct btrfs_delalloc_work *work;
9467 work = kmem_cache_zalloc(btrfs_delalloc_work_cachep, GFP_NOFS);
9471 init_completion(&work->completion);
9472 INIT_LIST_HEAD(&work->list);
9473 work->inode = inode;
9475 work->delay_iput = delay_iput;
9476 WARN_ON_ONCE(!inode);
9477 btrfs_init_work(&work->work, btrfs_flush_delalloc_helper,
9478 btrfs_run_delalloc_work, NULL, NULL);
9483 void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work)
9485 wait_for_completion(&work->completion);
9486 kmem_cache_free(btrfs_delalloc_work_cachep, work);
9490 * some fairly slow code that needs optimization. This walks the list
9491 * of all the inodes with pending delalloc and forces them to disk.
9493 static int __start_delalloc_inodes(struct btrfs_root *root, int delay_iput,
9496 struct btrfs_inode *binode;
9497 struct inode *inode;
9498 struct btrfs_delalloc_work *work, *next;
9499 struct list_head works;
9500 struct list_head splice;
9503 INIT_LIST_HEAD(&works);
9504 INIT_LIST_HEAD(&splice);
9506 mutex_lock(&root->delalloc_mutex);
9507 spin_lock(&root->delalloc_lock);
9508 list_splice_init(&root->delalloc_inodes, &splice);
9509 while (!list_empty(&splice)) {
9510 binode = list_entry(splice.next, struct btrfs_inode,
9513 list_move_tail(&binode->delalloc_inodes,
9514 &root->delalloc_inodes);
9515 inode = igrab(&binode->vfs_inode);
9517 cond_resched_lock(&root->delalloc_lock);
9520 spin_unlock(&root->delalloc_lock);
9522 work = btrfs_alloc_delalloc_work(inode, 0, delay_iput);
9525 btrfs_add_delayed_iput(inode);
9531 list_add_tail(&work->list, &works);
9532 btrfs_queue_work(root->fs_info->flush_workers,
9535 if (nr != -1 && ret >= nr)
9538 spin_lock(&root->delalloc_lock);
9540 spin_unlock(&root->delalloc_lock);
9543 list_for_each_entry_safe(work, next, &works, list) {
9544 list_del_init(&work->list);
9545 btrfs_wait_and_free_delalloc_work(work);
9548 if (!list_empty_careful(&splice)) {
9549 spin_lock(&root->delalloc_lock);
9550 list_splice_tail(&splice, &root->delalloc_inodes);
9551 spin_unlock(&root->delalloc_lock);
9553 mutex_unlock(&root->delalloc_mutex);
9557 int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput)
9561 if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state))
9564 ret = __start_delalloc_inodes(root, delay_iput, -1);
9568 * the filemap_flush will queue IO into the worker threads, but
9569 * we have to make sure the IO is actually started and that
9570 * ordered extents get created before we return
9572 atomic_inc(&root->fs_info->async_submit_draining);
9573 while (atomic_read(&root->fs_info->nr_async_submits) ||
9574 atomic_read(&root->fs_info->async_delalloc_pages)) {
9575 wait_event(root->fs_info->async_submit_wait,
9576 (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
9577 atomic_read(&root->fs_info->async_delalloc_pages) == 0));
9579 atomic_dec(&root->fs_info->async_submit_draining);
9583 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int delay_iput,
9586 struct btrfs_root *root;
9587 struct list_head splice;
9590 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
9593 INIT_LIST_HEAD(&splice);
9595 mutex_lock(&fs_info->delalloc_root_mutex);
9596 spin_lock(&fs_info->delalloc_root_lock);
9597 list_splice_init(&fs_info->delalloc_roots, &splice);
9598 while (!list_empty(&splice) && nr) {
9599 root = list_first_entry(&splice, struct btrfs_root,
9601 root = btrfs_grab_fs_root(root);
9603 list_move_tail(&root->delalloc_root,
9604 &fs_info->delalloc_roots);
9605 spin_unlock(&fs_info->delalloc_root_lock);
9607 ret = __start_delalloc_inodes(root, delay_iput, nr);
9608 btrfs_put_fs_root(root);
9616 spin_lock(&fs_info->delalloc_root_lock);
9618 spin_unlock(&fs_info->delalloc_root_lock);
9621 atomic_inc(&fs_info->async_submit_draining);
9622 while (atomic_read(&fs_info->nr_async_submits) ||
9623 atomic_read(&fs_info->async_delalloc_pages)) {
9624 wait_event(fs_info->async_submit_wait,
9625 (atomic_read(&fs_info->nr_async_submits) == 0 &&
9626 atomic_read(&fs_info->async_delalloc_pages) == 0));
9628 atomic_dec(&fs_info->async_submit_draining);
9630 if (!list_empty_careful(&splice)) {
9631 spin_lock(&fs_info->delalloc_root_lock);
9632 list_splice_tail(&splice, &fs_info->delalloc_roots);
9633 spin_unlock(&fs_info->delalloc_root_lock);
9635 mutex_unlock(&fs_info->delalloc_root_mutex);
9639 static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
9640 const char *symname)
9642 struct btrfs_trans_handle *trans;
9643 struct btrfs_root *root = BTRFS_I(dir)->root;
9644 struct btrfs_path *path;
9645 struct btrfs_key key;
9646 struct inode *inode = NULL;
9654 struct btrfs_file_extent_item *ei;
9655 struct extent_buffer *leaf;
9657 name_len = strlen(symname);
9658 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
9659 return -ENAMETOOLONG;
9662 * 2 items for inode item and ref
9663 * 2 items for dir items
9664 * 1 item for updating parent inode item
9665 * 1 item for the inline extent item
9666 * 1 item for xattr if selinux is on
9668 trans = btrfs_start_transaction(root, 7);
9670 return PTR_ERR(trans);
9672 err = btrfs_find_free_ino(root, &objectid);
9676 inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
9677 dentry->d_name.len, btrfs_ino(dir), objectid,
9678 S_IFLNK|S_IRWXUGO, &index);
9679 if (IS_ERR(inode)) {
9680 err = PTR_ERR(inode);
9685 * If the active LSM wants to access the inode during
9686 * d_instantiate it needs these. Smack checks to see
9687 * if the filesystem supports xattrs by looking at the
9690 inode->i_fop = &btrfs_file_operations;
9691 inode->i_op = &btrfs_file_inode_operations;
9692 inode->i_mapping->a_ops = &btrfs_aops;
9693 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
9695 err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name);
9697 goto out_unlock_inode;
9699 err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index);
9701 goto out_unlock_inode;
9703 path = btrfs_alloc_path();
9706 goto out_unlock_inode;
9708 key.objectid = btrfs_ino(inode);
9710 key.type = BTRFS_EXTENT_DATA_KEY;
9711 datasize = btrfs_file_extent_calc_inline_size(name_len);
9712 err = btrfs_insert_empty_item(trans, root, path, &key,
9715 btrfs_free_path(path);
9716 goto out_unlock_inode;
9718 leaf = path->nodes[0];
9719 ei = btrfs_item_ptr(leaf, path->slots[0],
9720 struct btrfs_file_extent_item);
9721 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
9722 btrfs_set_file_extent_type(leaf, ei,
9723 BTRFS_FILE_EXTENT_INLINE);
9724 btrfs_set_file_extent_encryption(leaf, ei, 0);
9725 btrfs_set_file_extent_compression(leaf, ei, 0);
9726 btrfs_set_file_extent_other_encoding(leaf, ei, 0);
9727 btrfs_set_file_extent_ram_bytes(leaf, ei, name_len);
9729 ptr = btrfs_file_extent_inline_start(ei);
9730 write_extent_buffer(leaf, symname, ptr, name_len);
9731 btrfs_mark_buffer_dirty(leaf);
9732 btrfs_free_path(path);
9734 inode->i_op = &btrfs_symlink_inode_operations;
9735 inode->i_mapping->a_ops = &btrfs_symlink_aops;
9736 inode_set_bytes(inode, name_len);
9737 btrfs_i_size_write(inode, name_len);
9738 err = btrfs_update_inode(trans, root, inode);
9741 goto out_unlock_inode;
9744 unlock_new_inode(inode);
9745 d_instantiate(dentry, inode);
9748 btrfs_end_transaction(trans, root);
9750 inode_dec_link_count(inode);
9753 btrfs_btree_balance_dirty(root);
9758 unlock_new_inode(inode);
9762 static int __btrfs_prealloc_file_range(struct inode *inode, int mode,
9763 u64 start, u64 num_bytes, u64 min_size,
9764 loff_t actual_len, u64 *alloc_hint,
9765 struct btrfs_trans_handle *trans)
9767 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
9768 struct extent_map *em;
9769 struct btrfs_root *root = BTRFS_I(inode)->root;
9770 struct btrfs_key ins;
9771 u64 cur_offset = start;
9774 u64 last_alloc = (u64)-1;
9776 bool own_trans = true;
9780 while (num_bytes > 0) {
9782 trans = btrfs_start_transaction(root, 3);
9783 if (IS_ERR(trans)) {
9784 ret = PTR_ERR(trans);
9789 cur_bytes = min(num_bytes, 256ULL * 1024 * 1024);
9790 cur_bytes = max(cur_bytes, min_size);
9792 * If we are severely fragmented we could end up with really
9793 * small allocations, so if the allocator is returning small
9794 * chunks lets make its job easier by only searching for those
9797 cur_bytes = min(cur_bytes, last_alloc);
9798 ret = btrfs_reserve_extent(root, cur_bytes, min_size, 0,
9799 *alloc_hint, &ins, 1, 0);
9802 btrfs_end_transaction(trans, root);
9806 last_alloc = ins.offset;
9807 ret = insert_reserved_file_extent(trans, inode,
9808 cur_offset, ins.objectid,
9809 ins.offset, ins.offset,
9810 ins.offset, 0, 0, 0,
9811 BTRFS_FILE_EXTENT_PREALLOC);
9813 btrfs_free_reserved_extent(root, ins.objectid,
9815 btrfs_abort_transaction(trans, root, ret);
9817 btrfs_end_transaction(trans, root);
9821 btrfs_drop_extent_cache(inode, cur_offset,
9822 cur_offset + ins.offset -1, 0);
9824 em = alloc_extent_map();
9826 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
9827 &BTRFS_I(inode)->runtime_flags);
9831 em->start = cur_offset;
9832 em->orig_start = cur_offset;
9833 em->len = ins.offset;
9834 em->block_start = ins.objectid;
9835 em->block_len = ins.offset;
9836 em->orig_block_len = ins.offset;
9837 em->ram_bytes = ins.offset;
9838 em->bdev = root->fs_info->fs_devices->latest_bdev;
9839 set_bit(EXTENT_FLAG_PREALLOC, &em->flags);
9840 em->generation = trans->transid;
9843 write_lock(&em_tree->lock);
9844 ret = add_extent_mapping(em_tree, em, 1);
9845 write_unlock(&em_tree->lock);
9848 btrfs_drop_extent_cache(inode, cur_offset,
9849 cur_offset + ins.offset - 1,
9852 free_extent_map(em);
9854 num_bytes -= ins.offset;
9855 cur_offset += ins.offset;
9856 *alloc_hint = ins.objectid + ins.offset;
9858 inode_inc_iversion(inode);
9859 inode->i_ctime = CURRENT_TIME;
9860 BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC;
9861 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
9862 (actual_len > inode->i_size) &&
9863 (cur_offset > inode->i_size)) {
9864 if (cur_offset > actual_len)
9865 i_size = actual_len;
9867 i_size = cur_offset;
9868 i_size_write(inode, i_size);
9869 btrfs_ordered_update_i_size(inode, i_size, NULL);
9872 ret = btrfs_update_inode(trans, root, inode);
9875 btrfs_abort_transaction(trans, root, ret);
9877 btrfs_end_transaction(trans, root);
9882 btrfs_end_transaction(trans, root);
9887 int btrfs_prealloc_file_range(struct inode *inode, int mode,
9888 u64 start, u64 num_bytes, u64 min_size,
9889 loff_t actual_len, u64 *alloc_hint)
9891 return __btrfs_prealloc_file_range(inode, mode, start, num_bytes,
9892 min_size, actual_len, alloc_hint,
9896 int btrfs_prealloc_file_range_trans(struct inode *inode,
9897 struct btrfs_trans_handle *trans, int mode,
9898 u64 start, u64 num_bytes, u64 min_size,
9899 loff_t actual_len, u64 *alloc_hint)
9901 return __btrfs_prealloc_file_range(inode, mode, start, num_bytes,
9902 min_size, actual_len, alloc_hint, trans);
9905 static int btrfs_set_page_dirty(struct page *page)
9907 return __set_page_dirty_nobuffers(page);
9910 static int btrfs_permission(struct inode *inode, int mask)
9912 struct btrfs_root *root = BTRFS_I(inode)->root;
9913 umode_t mode = inode->i_mode;
9915 if (mask & MAY_WRITE &&
9916 (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) {
9917 if (btrfs_root_readonly(root))
9919 if (BTRFS_I(inode)->flags & BTRFS_INODE_READONLY)
9922 return generic_permission(inode, mask);
9925 static int btrfs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
9927 struct btrfs_trans_handle *trans;
9928 struct btrfs_root *root = BTRFS_I(dir)->root;
9929 struct inode *inode = NULL;
9935 * 5 units required for adding orphan entry
9937 trans = btrfs_start_transaction(root, 5);
9939 return PTR_ERR(trans);
9941 ret = btrfs_find_free_ino(root, &objectid);
9945 inode = btrfs_new_inode(trans, root, dir, NULL, 0,
9946 btrfs_ino(dir), objectid, mode, &index);
9947 if (IS_ERR(inode)) {
9948 ret = PTR_ERR(inode);
9953 inode->i_fop = &btrfs_file_operations;
9954 inode->i_op = &btrfs_file_inode_operations;
9956 inode->i_mapping->a_ops = &btrfs_aops;
9957 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
9959 ret = btrfs_init_inode_security(trans, inode, dir, NULL);
9963 ret = btrfs_update_inode(trans, root, inode);
9966 ret = btrfs_orphan_add(trans, inode);
9971 * We set number of links to 0 in btrfs_new_inode(), and here we set
9972 * it to 1 because d_tmpfile() will issue a warning if the count is 0,
9975 * d_tmpfile() -> inode_dec_link_count() -> drop_nlink()
9977 set_nlink(inode, 1);
9978 unlock_new_inode(inode);
9979 d_tmpfile(dentry, inode);
9980 mark_inode_dirty(inode);
9983 btrfs_end_transaction(trans, root);
9986 btrfs_balance_delayed_items(root);
9987 btrfs_btree_balance_dirty(root);
9991 unlock_new_inode(inode);
9996 /* Inspired by filemap_check_errors() */
9997 int btrfs_inode_check_errors(struct inode *inode)
10001 if (test_bit(AS_ENOSPC, &inode->i_mapping->flags) &&
10002 test_and_clear_bit(AS_ENOSPC, &inode->i_mapping->flags))
10004 if (test_bit(AS_EIO, &inode->i_mapping->flags) &&
10005 test_and_clear_bit(AS_EIO, &inode->i_mapping->flags))
10011 static const struct inode_operations btrfs_dir_inode_operations = {
10012 .getattr = btrfs_getattr,
10013 .lookup = btrfs_lookup,
10014 .create = btrfs_create,
10015 .unlink = btrfs_unlink,
10016 .link = btrfs_link,
10017 .mkdir = btrfs_mkdir,
10018 .rmdir = btrfs_rmdir,
10019 .rename2 = btrfs_rename2,
10020 .symlink = btrfs_symlink,
10021 .setattr = btrfs_setattr,
10022 .mknod = btrfs_mknod,
10023 .setxattr = btrfs_setxattr,
10024 .getxattr = btrfs_getxattr,
10025 .listxattr = btrfs_listxattr,
10026 .removexattr = btrfs_removexattr,
10027 .permission = btrfs_permission,
10028 .get_acl = btrfs_get_acl,
10029 .set_acl = btrfs_set_acl,
10030 .update_time = btrfs_update_time,
10031 .tmpfile = btrfs_tmpfile,
10033 static const struct inode_operations btrfs_dir_ro_inode_operations = {
10034 .lookup = btrfs_lookup,
10035 .permission = btrfs_permission,
10036 .get_acl = btrfs_get_acl,
10037 .set_acl = btrfs_set_acl,
10038 .update_time = btrfs_update_time,
10041 static const struct file_operations btrfs_dir_file_operations = {
10042 .llseek = generic_file_llseek,
10043 .read = generic_read_dir,
10044 .iterate = btrfs_real_readdir,
10045 .unlocked_ioctl = btrfs_ioctl,
10046 #ifdef CONFIG_COMPAT
10047 .compat_ioctl = btrfs_ioctl,
10049 .release = btrfs_release_file,
10050 .fsync = btrfs_sync_file,
10053 static struct extent_io_ops btrfs_extent_io_ops = {
10054 .fill_delalloc = run_delalloc_range,
10055 .submit_bio_hook = btrfs_submit_bio_hook,
10056 .merge_bio_hook = btrfs_merge_bio_hook,
10057 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
10058 .writepage_end_io_hook = btrfs_writepage_end_io_hook,
10059 .writepage_start_hook = btrfs_writepage_start_hook,
10060 .set_bit_hook = btrfs_set_bit_hook,
10061 .clear_bit_hook = btrfs_clear_bit_hook,
10062 .merge_extent_hook = btrfs_merge_extent_hook,
10063 .split_extent_hook = btrfs_split_extent_hook,
10067 * btrfs doesn't support the bmap operation because swapfiles
10068 * use bmap to make a mapping of extents in the file. They assume
10069 * these extents won't change over the life of the file and they
10070 * use the bmap result to do IO directly to the drive.
10072 * the btrfs bmap call would return logical addresses that aren't
10073 * suitable for IO and they also will change frequently as COW
10074 * operations happen. So, swapfile + btrfs == corruption.
10076 * For now we're avoiding this by dropping bmap.
10078 static const struct address_space_operations btrfs_aops = {
10079 .readpage = btrfs_readpage,
10080 .writepage = btrfs_writepage,
10081 .writepages = btrfs_writepages,
10082 .readpages = btrfs_readpages,
10083 .direct_IO = btrfs_direct_IO,
10084 .invalidatepage = btrfs_invalidatepage,
10085 .releasepage = btrfs_releasepage,
10086 .set_page_dirty = btrfs_set_page_dirty,
10087 .error_remove_page = generic_error_remove_page,
10090 static const struct address_space_operations btrfs_symlink_aops = {
10091 .readpage = btrfs_readpage,
10092 .writepage = btrfs_writepage,
10093 .invalidatepage = btrfs_invalidatepage,
10094 .releasepage = btrfs_releasepage,
10097 static const struct inode_operations btrfs_file_inode_operations = {
10098 .getattr = btrfs_getattr,
10099 .setattr = btrfs_setattr,
10100 .setxattr = btrfs_setxattr,
10101 .getxattr = btrfs_getxattr,
10102 .listxattr = btrfs_listxattr,
10103 .removexattr = btrfs_removexattr,
10104 .permission = btrfs_permission,
10105 .fiemap = btrfs_fiemap,
10106 .get_acl = btrfs_get_acl,
10107 .set_acl = btrfs_set_acl,
10108 .update_time = btrfs_update_time,
10110 static const struct inode_operations btrfs_special_inode_operations = {
10111 .getattr = btrfs_getattr,
10112 .setattr = btrfs_setattr,
10113 .permission = btrfs_permission,
10114 .setxattr = btrfs_setxattr,
10115 .getxattr = btrfs_getxattr,
10116 .listxattr = btrfs_listxattr,
10117 .removexattr = btrfs_removexattr,
10118 .get_acl = btrfs_get_acl,
10119 .set_acl = btrfs_set_acl,
10120 .update_time = btrfs_update_time,
10122 static const struct inode_operations btrfs_symlink_inode_operations = {
10123 .readlink = generic_readlink,
10124 .follow_link = page_follow_link_light,
10125 .put_link = page_put_link,
10126 .getattr = btrfs_getattr,
10127 .setattr = btrfs_setattr,
10128 .permission = btrfs_permission,
10129 .setxattr = btrfs_setxattr,
10130 .getxattr = btrfs_getxattr,
10131 .listxattr = btrfs_listxattr,
10132 .removexattr = btrfs_removexattr,
10133 .update_time = btrfs_update_time,
10136 const struct dentry_operations btrfs_dentry_operations = {
10137 .d_delete = btrfs_dentry_delete,
10138 .d_release = btrfs_dentry_release,