}
if (retval > 0) {
int ret;
- unsigned long long status;
+ unsigned int status;
if (unlikely(retval != map->m_len)) {
ext4_warning(inode->i_sb,
if (retval > 0) {
int ret;
- unsigned long long status;
+ unsigned int status;
if (unlikely(retval != map->m_len)) {
ext4_warning(inode->i_sb,
ret = ext4_map_blocks(handle, inode, &map, flags);
if (ret > 0) {
+ ext4_io_end_t *io_end = ext4_inode_aio(inode);
+
map_bh(bh, inode->i_sb, map.m_pblk);
bh->b_state = (bh->b_state & ~EXT4_MAP_FLAGS) | map.m_flags;
+ if (io_end && io_end->flag & EXT4_IO_END_UNWRITTEN)
+ set_buffer_defer_completion(bh);
bh->b_size = inode->i_sb->s_blocksize * map.m_len;
ret = 0;
}
ext4_journal_stop(handle);
goto retry_grab;
}
- wait_on_page_writeback(page);
+ /* In case writeback began while the page was unlocked */
+ wait_for_stable_page(page);
if (ext4_should_dioread_nolock(inode))
ret = __block_write_begin(page, pos, len, ext4_get_block_write);
set_buffer_delay(bh);
} else if (retval > 0) {
int ret;
- unsigned long long status;
+ unsigned int status;
if (unlikely(retval != map->m_len)) {
ext4_warning(inode->i_sb,
return ret;
}
+static int mpage_submit_page(struct mpage_da_data *mpd, struct page *page)
+{
+ int len;
+ loff_t size = i_size_read(mpd->inode);
+ int err;
+
+ BUG_ON(page->index != mpd->first_page);
+ if (page->index == size >> PAGE_CACHE_SHIFT)
+ len = size & ~PAGE_CACHE_MASK;
+ else
+ len = PAGE_CACHE_SIZE;
+ clear_page_dirty_for_io(page);
+ err = ext4_bio_write_page(&mpd->io_submit, page, len, mpd->wbc);
+ if (!err)
+ mpd->wbc->nr_to_write--;
+ mpd->first_page++;
+
+ return err;
+}
+
#define BH_FLAGS ((1 << BH_Unwritten) | (1 << BH_Delay))
/*
* mballoc gives us at most this number of blocks...
* XXX: That seems to be only a limitation of ext4_mb_normalize_request().
- * The rest of mballoc seems to handle chunks upto full group size.
+ * The rest of mballoc seems to handle chunks up to full group size.
*/
#define MAX_WRITEPAGES_EXTENT_LEN 2048
*
* @mpd - extent of blocks
* @lblk - logical number of the block in the file
- * @b_state - b_state of the buffer head added
+ * @bh - buffer head we want to add to the extent
*
- * the function is used to collect contig. blocks in same state
+ * The function is used to collect contig. blocks in the same state. If the
+ * buffer doesn't require mapping for writeback and we haven't started the
+ * extent of buffers to map yet, the function returns 'true' immediately - the
+ * caller can write the buffer right away. Otherwise the function returns true
+ * if the block has been added to the extent, false if the block couldn't be
+ * added.
*/
-static int mpage_add_bh_to_extent(struct mpage_da_data *mpd, ext4_lblk_t lblk,
- unsigned long b_state)
+static bool mpage_add_bh_to_extent(struct mpage_da_data *mpd, ext4_lblk_t lblk,
+ struct buffer_head *bh)
{
struct ext4_map_blocks *map = &mpd->map;
- /* Don't go larger than mballoc is willing to allocate */
- if (map->m_len >= MAX_WRITEPAGES_EXTENT_LEN)
- return 0;
+ /* Buffer that doesn't need mapping for writeback? */
+ if (!buffer_dirty(bh) || !buffer_mapped(bh) ||
+ (!buffer_delay(bh) && !buffer_unwritten(bh))) {
+ /* So far no extent to map => we write the buffer right away */
+ if (map->m_len == 0)
+ return true;
+ return false;
+ }
/* First block in the extent? */
if (map->m_len == 0) {
map->m_lblk = lblk;
map->m_len = 1;
- map->m_flags = b_state & BH_FLAGS;
- return 1;
+ map->m_flags = bh->b_state & BH_FLAGS;
+ return true;
}
+ /* Don't go larger than mballoc is willing to allocate */
+ if (map->m_len >= MAX_WRITEPAGES_EXTENT_LEN)
+ return false;
+
/* Can we merge the block to our big extent? */
if (lblk == map->m_lblk + map->m_len &&
- (b_state & BH_FLAGS) == map->m_flags) {
+ (bh->b_state & BH_FLAGS) == map->m_flags) {
map->m_len++;
- return 1;
+ return true;
}
- return 0;
+ return false;
}
-static bool add_page_bufs_to_extent(struct mpage_da_data *mpd,
- struct buffer_head *head,
- struct buffer_head *bh,
- ext4_lblk_t lblk)
+/*
+ * mpage_process_page_bufs - submit page buffers for IO or add them to extent
+ *
+ * @mpd - extent of blocks for mapping
+ * @head - the first buffer in the page
+ * @bh - buffer we should start processing from
+ * @lblk - logical number of the block in the file corresponding to @bh
+ *
+ * Walk through page buffers from @bh upto @head (exclusive) and either submit
+ * the page for IO if all buffers in this page were mapped and there's no
+ * accumulated extent of buffers to map or add buffers in the page to the
+ * extent of buffers to map. The function returns 1 if the caller can continue
+ * by processing the next page, 0 if it should stop adding buffers to the
+ * extent to map because we cannot extend it anymore. It can also return value
+ * < 0 in case of error during IO submission.
+ */
+static int mpage_process_page_bufs(struct mpage_da_data *mpd,
+ struct buffer_head *head,
+ struct buffer_head *bh,
+ ext4_lblk_t lblk)
{
struct inode *inode = mpd->inode;
+ int err;
ext4_lblk_t blocks = (i_size_read(inode) + (1 << inode->i_blkbits) - 1)
>> inode->i_blkbits;
do {
BUG_ON(buffer_locked(bh));
- if (!buffer_dirty(bh) || !buffer_mapped(bh) ||
- (!buffer_delay(bh) && !buffer_unwritten(bh)) ||
- lblk >= blocks) {
+ if (lblk >= blocks || !mpage_add_bh_to_extent(mpd, lblk, bh)) {
/* Found extent to map? */
if (mpd->map.m_len)
- return false;
- if (lblk >= blocks)
- return true;
- continue;
+ return 0;
+ /* Everything mapped so far and we hit EOF */
+ break;
}
- if (!mpage_add_bh_to_extent(mpd, lblk, bh->b_state))
- return false;
} while (lblk++, (bh = bh->b_this_page) != head);
- return true;
-}
-
-static int mpage_submit_page(struct mpage_da_data *mpd, struct page *page)
-{
- int len;
- loff_t size = i_size_read(mpd->inode);
- int err;
-
- BUG_ON(page->index != mpd->first_page);
- if (page->index == size >> PAGE_CACHE_SHIFT)
- len = size & ~PAGE_CACHE_MASK;
- else
- len = PAGE_CACHE_SIZE;
- clear_page_dirty_for_io(page);
- err = ext4_bio_write_page(&mpd->io_submit, page, len, mpd->wbc);
- if (!err)
- mpd->wbc->nr_to_write--;
- mpd->first_page++;
-
- return err;
+ /* So far everything mapped? Submit the page for IO. */
+ if (mpd->map.m_len == 0) {
+ err = mpage_submit_page(mpd, head->b_page);
+ if (err < 0)
+ return err;
+ }
+ return lblk < blocks;
}
/*
struct inode *inode = mpd->inode;
struct buffer_head *head, *bh;
int bpp_bits = PAGE_CACHE_SHIFT - inode->i_blkbits;
- ext4_lblk_t blocks = (i_size_read(inode) + (1 << inode->i_blkbits) - 1)
- >> inode->i_blkbits;
pgoff_t start, end;
ext4_lblk_t lblk;
sector_t pblock;
if (page->index > end)
break;
- /* Upto 'end' pages must be contiguous */
+ /* Up to 'end' pages must be contiguous */
BUG_ON(page->index != start);
bh = head = page_buffers(page);
do {
*/
mpd->map.m_len = 0;
mpd->map.m_flags = 0;
- add_page_bufs_to_extent(mpd, head, bh,
- lblk);
+ /*
+ * FIXME: If dioread_nolock supports
+ * blocksize < pagesize, we need to make
+ * sure we add size mapped so far to
+ * io_end->size as the following call
+ * can submit the page for IO.
+ */
+ err = mpage_process_page_bufs(mpd, head,
+ bh, lblk);
pagevec_release(&pvec);
- return 0;
+ if (err > 0)
+ err = 0;
+ return err;
}
if (buffer_delay(bh)) {
clear_buffer_delay(bh);
bh->b_blocknr = pblock++;
}
clear_buffer_unwritten(bh);
- } while (++lblk < blocks &&
- (bh = bh->b_this_page) != head);
+ } while (lblk++, (bh = bh->b_this_page) != head);
/*
* FIXME: This is going to break if dioread_nolock
/* Update on-disk size after IO is submitted */
disksize = ((loff_t)mpd->first_page) << PAGE_CACHE_SHIFT;
- if (disksize > i_size_read(inode))
- disksize = i_size_read(inode);
if (disksize > EXT4_I(inode)->i_disksize) {
int err2;
- ext4_update_i_disksize(inode, disksize);
+ ext4_wb_update_i_disksize(inode, disksize);
err2 = ext4_mark_inode_dirty(handle, inode);
if (err2)
ext4_error(inode->i_sb,
/*
* Calculate the total number of credits to reserve for one writepages
* iteration. This is called from ext4_writepages(). We map an extent of
- * upto MAX_WRITEPAGES_EXTENT_LEN blocks and then we go on and finish mapping
+ * up to MAX_WRITEPAGES_EXTENT_LEN blocks and then we go on and finish mapping
* the last partial page. So in total we can map MAX_WRITEPAGES_EXTENT_LEN +
* bpp - 1 blocks in bpp different extents.
*/
lblk = ((ext4_lblk_t)page->index) <<
(PAGE_CACHE_SHIFT - blkbits);
head = page_buffers(page);
- if (!add_page_bufs_to_extent(mpd, head, head, lblk))
+ err = mpage_process_page_bufs(mpd, head, head, lblk);
+ if (err <= 0)
goto out;
- /* So far everything mapped? Submit the page for IO. */
- if (mpd->map.m_len == 0) {
- err = mpage_submit_page(mpd, page);
- if (err < 0)
- goto out;
- }
+ err = 0;
/*
* Accumulated enough dirty pages? This doesn't apply
if (ext4_should_dioread_nolock(inode)) {
/*
- * We may need to convert upto one extent per block in
+ * We may need to convert up to one extent per block in
* the page and we may dirty the inode.
*/
rsv_blocks = 1 + (PAGE_CACHE_SIZE >> inode->i_blkbits);
goto retry_grab;
}
/* In case writeback began while the page was unlocked */
- wait_on_page_writeback(page);
+ wait_for_stable_page(page);
ret = __block_write_begin(page, pos, len, ext4_da_get_block_prep);
if (ret < 0) {
}
static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset,
- ssize_t size, void *private, int ret,
- bool is_async)
+ ssize_t size, void *private)
{
- struct inode *inode = file_inode(iocb->ki_filp);
ext4_io_end_t *io_end = iocb->private;
/* if not async direct IO just return */
- if (!io_end) {
- inode_dio_done(inode);
- if (is_async)
- aio_complete(iocb, ret, 0);
+ if (!io_end)
return;
- }
ext_debug("ext4_end_io_dio(): io_end 0x%p "
"for inode %lu, iocb 0x%p, offset %llu, size %zd\n",
iocb->private = NULL;
io_end->offset = offset;
io_end->size = size;
- if (is_async) {
- io_end->iocb = iocb;
- io_end->result = ret;
- }
- ext4_put_io_end_defer(io_end);
+ ext4_put_io_end(io_end);
}
/*
ret = -ENOMEM;
goto retake_lock;
}
- io_end->flag |= EXT4_IO_END_DIRECT;
/*
* Grab reference for DIO. Will be dropped in ext4_end_io_dio()
*/
if (ret <= 0 && ret != -EIOCBQUEUED && iocb->private) {
WARN_ON(iocb->private != io_end);
WARN_ON(io_end->flag & EXT4_IO_END_UNWRITTEN);
- WARN_ON(io_end->iocb);
- /*
- * Generic code already did inode_dio_done() so we
- * have to clear EXT4_IO_END_DIRECT to not do it for
- * the second time.
- */
- io_end->flag = 0;
ext4_put_io_end(io_end);
iocb->private = NULL;
}
ext4_journal_stop(handle);
}
- if (attr->ia_valid & ATTR_SIZE) {
+ if (attr->ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
+ handle_t *handle;
if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
if (attr->ia_size > sbi->s_bitmap_maxbytes)
return -EFBIG;
}
- }
-
- if (S_ISREG(inode->i_mode) &&
- attr->ia_valid & ATTR_SIZE &&
- (attr->ia_size < inode->i_size)) {
- handle_t *handle;
-
- handle = ext4_journal_start(inode, EXT4_HT_INODE, 3);
- if (IS_ERR(handle)) {
- error = PTR_ERR(handle);
- goto err_out;
- }
- if (ext4_handle_valid(handle)) {
- error = ext4_orphan_add(handle, inode);
- orphan = 1;
- }
- EXT4_I(inode)->i_disksize = attr->ia_size;
- rc = ext4_mark_inode_dirty(handle, inode);
- if (!error)
- error = rc;
- ext4_journal_stop(handle);
-
- if (ext4_should_order_data(inode)) {
- error = ext4_begin_ordered_truncate(inode,
+ if (S_ISREG(inode->i_mode) &&
+ (attr->ia_size < inode->i_size)) {
+ if (ext4_should_order_data(inode)) {
+ error = ext4_begin_ordered_truncate(inode,
attr->ia_size);
- if (error) {
- /* Do as much error cleanup as possible */
- handle = ext4_journal_start(inode,
- EXT4_HT_INODE, 3);
- if (IS_ERR(handle)) {
- ext4_orphan_del(NULL, inode);
+ if (error)
goto err_out;
- }
- ext4_orphan_del(handle, inode);
- orphan = 0;
- ext4_journal_stop(handle);
+ }
+ handle = ext4_journal_start(inode, EXT4_HT_INODE, 3);
+ if (IS_ERR(handle)) {
+ error = PTR_ERR(handle);
goto err_out;
}
- }
- }
-
- if (attr->ia_valid & ATTR_SIZE) {
- if (attr->ia_size != inode->i_size) {
- loff_t oldsize = inode->i_size;
-
- i_size_write(inode, attr->ia_size);
- /*
- * Blocks are going to be removed from the inode. Wait
- * for dio in flight. Temporarily disable
- * dioread_nolock to prevent livelock.
- */
- if (orphan) {
- if (!ext4_should_journal_data(inode)) {
- ext4_inode_block_unlocked_dio(inode);
- inode_dio_wait(inode);
- ext4_inode_resume_unlocked_dio(inode);
- } else
- ext4_wait_for_tail_page_commit(inode);
+ if (ext4_handle_valid(handle)) {
+ error = ext4_orphan_add(handle, inode);
+ orphan = 1;
}
+ down_write(&EXT4_I(inode)->i_data_sem);
+ EXT4_I(inode)->i_disksize = attr->ia_size;
+ rc = ext4_mark_inode_dirty(handle, inode);
+ if (!error)
+ error = rc;
/*
- * Truncate pagecache after we've waited for commit
- * in data=journal mode to make pages freeable.
+ * We have to update i_size under i_data_sem together
+ * with i_disksize to avoid races with writeback code
+ * running ext4_wb_update_i_disksize().
*/
- truncate_pagecache(inode, oldsize, inode->i_size);
+ if (!error)
+ i_size_write(inode, attr->ia_size);
+ up_write(&EXT4_I(inode)->i_data_sem);
+ ext4_journal_stop(handle);
+ if (error) {
+ ext4_orphan_del(NULL, inode);
+ goto err_out;
+ }
+ } else
+ i_size_write(inode, attr->ia_size);
+
+ /*
+ * Blocks are going to be removed from the inode. Wait
+ * for dio in flight. Temporarily disable
+ * dioread_nolock to prevent livelock.
+ */
+ if (orphan) {
+ if (!ext4_should_journal_data(inode)) {
+ ext4_inode_block_unlocked_dio(inode);
+ inode_dio_wait(inode);
+ ext4_inode_resume_unlocked_dio(inode);
+ } else
+ ext4_wait_for_tail_page_commit(inode);
}
- ext4_truncate(inode);
+ /*
+ * Truncate pagecache after we've waited for commit
+ * in data=journal mode to make pages freeable.
+ */
+ truncate_pagecache(inode, inode->i_size);
}
+ /*
+ * We want to call ext4_truncate() even if attr->ia_size ==
+ * inode->i_size for cases like truncation of fallocated space
+ */
+ if (attr->ia_valid & ATTR_SIZE)
+ ext4_truncate(inode);
if (!rc) {
setattr_copy(inode, attr);
projects / firefly-linux-kernel-4.4.55.git / blobdiff