2 * Copyright (C) 2005, 2006
3 * Avishay Traeger (avishay@gmail.com)
4 * Copyright (C) 2008, 2009
5 * Boaz Harrosh <bharrosh@panasas.com>
7 * Copyrights for code taken from ext2:
8 * Copyright (C) 1992, 1993, 1994, 1995
9 * Remy Card (card@masi.ibp.fr)
10 * Laboratoire MASI - Institut Blaise Pascal
11 * Universite Pierre et Marie Curie (Paris VI)
13 * linux/fs/minix/inode.c
14 * Copyright (C) 1991, 1992 Linus Torvalds
16 * This file is part of exofs.
18 * exofs is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation. Since it is based on ext2, and the only
21 * valid version of GPL for the Linux kernel is version 2, the only valid
22 * version of GPL for exofs is version 2.
24 * exofs is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
29 * You should have received a copy of the GNU General Public License
30 * along with exofs; if not, write to the Free Software
31 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
34 #include <linux/string.h>
35 #include <linux/parser.h>
36 #include <linux/vfs.h>
37 #include <linux/random.h>
38 #include <linux/exportfs.h>
39 #include <linux/slab.h>
43 /******************************************************************************
45 *****************************************************************************/
48 * struct to hold what we get from mount options
50 struct exofs_mountopt {
58 * exofs-specific mount-time options.
60 enum { Opt_name, Opt_pid, Opt_to, Opt_err };
63 * Our mount-time options. These should ideally be 64-bit unsigned, but the
64 * kernel's parsing functions do not currently support that. 32-bit should be
65 * sufficient for most applications now.
67 static match_table_t tokens = {
68 {Opt_name, "osdname=%s"},
75 * The main option parsing method. Also makes sure that all of the mandatory
76 * mount options were set.
78 static int parse_options(char *options, struct exofs_mountopt *opts)
81 substring_t args[MAX_OPT_ARGS];
85 EXOFS_DBGMSG("parse_options %s\n", options);
87 memset(opts, 0, sizeof(*opts));
88 opts->timeout = BLK_DEFAULT_SG_TIMEOUT;
90 while ((p = strsep(&options, ",")) != NULL) {
97 token = match_token(p, tokens, args);
100 opts->dev_name = match_strdup(&args[0]);
101 if (unlikely(!opts->dev_name)) {
102 EXOFS_ERR("Error allocating dev_name");
105 opts->is_osdname = true;
108 if (0 == match_strlcpy(str, &args[0], sizeof(str)))
110 opts->pid = simple_strtoull(str, NULL, 0);
111 if (opts->pid < EXOFS_MIN_PID) {
112 EXOFS_ERR("Partition ID must be >= %u",
119 if (match_int(&args[0], &option))
122 EXOFS_ERR("Timout must be > 0");
125 opts->timeout = option * HZ;
131 EXOFS_ERR("Need to specify the following options:\n");
132 EXOFS_ERR(" -o pid=pid_no_to_use\n");
139 /******************************************************************************
141 *****************************************************************************/
144 * Our inode cache. Isn't it pretty?
146 static struct kmem_cache *exofs_inode_cachep;
149 * Allocate an inode in the cache
151 static struct inode *exofs_alloc_inode(struct super_block *sb)
153 struct exofs_i_info *oi;
155 oi = kmem_cache_alloc(exofs_inode_cachep, GFP_KERNEL);
159 oi->vfs_inode.i_version = 1;
160 return &oi->vfs_inode;
163 static void exofs_i_callback(struct rcu_head *head)
165 struct inode *inode = container_of(head, struct inode, i_rcu);
166 INIT_LIST_HEAD(&inode->i_dentry);
167 kmem_cache_free(exofs_inode_cachep, exofs_i(inode));
171 * Remove an inode from the cache
173 static void exofs_destroy_inode(struct inode *inode)
175 call_rcu(&inode->i_rcu, exofs_i_callback);
179 * Initialize the inode
181 static void exofs_init_once(void *foo)
183 struct exofs_i_info *oi = foo;
185 inode_init_once(&oi->vfs_inode);
189 * Create and initialize the inode cache
191 static int init_inodecache(void)
193 exofs_inode_cachep = kmem_cache_create("exofs_inode_cache",
194 sizeof(struct exofs_i_info), 0,
195 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
197 if (exofs_inode_cachep == NULL)
203 * Destroy the inode cache
205 static void destroy_inodecache(void)
207 kmem_cache_destroy(exofs_inode_cachep);
210 /******************************************************************************
211 * SUPERBLOCK FUNCTIONS
212 *****************************************************************************/
213 static const struct super_operations exofs_sops;
214 static const struct export_operations exofs_export_ops;
216 static const struct osd_attr g_attr_sb_stats = ATTR_DEF(
219 sizeof(struct exofs_sb_stats));
221 static int __sbi_read_stats(struct exofs_sb_info *sbi)
223 struct osd_attr attrs[] = {
224 [0] = g_attr_sb_stats,
226 struct exofs_io_state *ios;
229 ret = exofs_get_io_state(&sbi->layout, &ios);
231 EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__);
235 ios->cred = sbi->s_cred;
237 ios->in_attr = attrs;
238 ios->in_attr_len = ARRAY_SIZE(attrs);
240 ret = exofs_sbi_read(ios);
242 EXOFS_ERR("Error reading super_block stats => %d\n", ret);
246 ret = extract_attr_from_ios(ios, &attrs[0]);
248 EXOFS_ERR("%s: extract_attr of sb_stats failed\n", __func__);
252 struct exofs_sb_stats *ess;
254 if (unlikely(attrs[0].len != sizeof(*ess))) {
255 EXOFS_ERR("%s: Wrong version of exofs_sb_stats "
256 "size(%d) != expected(%zd)\n",
257 __func__, attrs[0].len, sizeof(*ess));
261 ess = attrs[0].val_ptr;
262 sbi->s_nextid = le64_to_cpu(ess->s_nextid);
263 sbi->s_numfiles = le32_to_cpu(ess->s_numfiles);
267 exofs_put_io_state(ios);
271 static void stats_done(struct exofs_io_state *ios, void *p)
273 exofs_put_io_state(ios);
274 /* Good thanks nothing to do anymore */
277 /* Asynchronously write the stats attribute */
278 int exofs_sbi_write_stats(struct exofs_sb_info *sbi)
280 struct osd_attr attrs[] = {
281 [0] = g_attr_sb_stats,
283 struct exofs_io_state *ios;
286 ret = exofs_get_io_state(&sbi->layout, &ios);
288 EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__);
292 sbi->s_ess.s_nextid = cpu_to_le64(sbi->s_nextid);
293 sbi->s_ess.s_numfiles = cpu_to_le64(sbi->s_numfiles);
294 attrs[0].val_ptr = &sbi->s_ess;
296 ios->cred = sbi->s_cred;
297 ios->done = stats_done;
299 ios->out_attr = attrs;
300 ios->out_attr_len = ARRAY_SIZE(attrs);
302 ret = exofs_sbi_write(ios);
304 EXOFS_ERR("%s: exofs_sbi_write failed.\n", __func__);
305 exofs_put_io_state(ios);
312 * Write the superblock to the OSD
314 int exofs_sync_fs(struct super_block *sb, int wait)
316 struct exofs_sb_info *sbi;
317 struct exofs_fscb *fscb;
318 struct exofs_io_state *ios;
321 fscb = kmalloc(sizeof(*fscb), GFP_KERNEL);
327 /* NOTE: We no longer dirty the super_block anywhere in exofs. The
328 * reason we write the fscb here on unmount is so we can stay backwards
329 * compatible with fscb->s_version == 1. (What we are not compatible
330 * with is if a new version FS crashed and then we try to mount an old
331 * version). Otherwise the exofs_fscb is read-only from mkfs time. All
332 * the writeable info is set in exofs_sbi_write_stats() above.
334 ret = exofs_get_io_state(&sbi->layout, &ios);
340 ios->length = offsetof(struct exofs_fscb, s_dev_table_oid);
341 memset(fscb, 0, ios->length);
342 fscb->s_nextid = cpu_to_le64(sbi->s_nextid);
343 fscb->s_numfiles = cpu_to_le32(sbi->s_numfiles);
344 fscb->s_magic = cpu_to_le16(sb->s_magic);
346 fscb->s_version = EXOFS_FSCB_VER;
348 ios->obj.id = EXOFS_SUPER_ID;
350 ios->kern_buff = fscb;
351 ios->cred = sbi->s_cred;
353 ret = exofs_sbi_write(ios);
355 EXOFS_ERR("%s: exofs_sbi_write failed.\n", __func__);
362 EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi->s_nextid), ret);
363 exofs_put_io_state(ios);
368 static void exofs_write_super(struct super_block *sb)
370 if (!(sb->s_flags & MS_RDONLY))
371 exofs_sync_fs(sb, 1);
376 static void _exofs_print_device(const char *msg, const char *dev_path,
377 struct osd_dev *od, u64 pid)
379 const struct osd_dev_info *odi = osduld_device_info(od);
381 printk(KERN_NOTICE "exofs: %s %s osd_name-%s pid-0x%llx\n",
382 msg, dev_path ?: "", odi->osdname, _LLU(pid));
385 void exofs_free_sbi(struct exofs_sb_info *sbi)
387 while (sbi->layout.s_numdevs) {
388 int i = --sbi->layout.s_numdevs;
389 struct osd_dev *od = sbi->layout.s_ods[i];
392 sbi->layout.s_ods[i] = NULL;
393 osduld_put_device(od);
400 * This function is called when the vfs is freeing the superblock. We just
401 * need to free our own part.
403 static void exofs_put_super(struct super_block *sb)
406 struct exofs_sb_info *sbi = sb->s_fs_info;
408 /* make sure there are no pending commands */
409 for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0;
410 num_pend = atomic_read(&sbi->s_curr_pending)) {
411 wait_queue_head_t wq;
412 init_waitqueue_head(&wq);
413 wait_event_timeout(wq,
414 (atomic_read(&sbi->s_curr_pending) == 0),
415 msecs_to_jiffies(100));
418 _exofs_print_device("Unmounting", NULL, sbi->layout.s_ods[0],
421 bdi_destroy(&sbi->bdi);
423 sb->s_fs_info = NULL;
426 static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs,
427 struct exofs_device_table *dt)
431 sbi->data_map.odm_num_comps =
432 le32_to_cpu(dt->dt_data_map.cb_num_comps);
433 sbi->data_map.odm_stripe_unit =
434 le64_to_cpu(dt->dt_data_map.cb_stripe_unit);
435 sbi->data_map.odm_group_width =
436 le32_to_cpu(dt->dt_data_map.cb_group_width);
437 sbi->data_map.odm_group_depth =
438 le32_to_cpu(dt->dt_data_map.cb_group_depth);
439 sbi->data_map.odm_mirror_cnt =
440 le32_to_cpu(dt->dt_data_map.cb_mirror_cnt);
441 sbi->data_map.odm_raid_algorithm =
442 le32_to_cpu(dt->dt_data_map.cb_raid_algorithm);
444 /* FIXME: Only raid0 for now. if not so, do not mount */
445 if (sbi->data_map.odm_num_comps != numdevs) {
446 EXOFS_ERR("odm_num_comps(%u) != numdevs(%u)\n",
447 sbi->data_map.odm_num_comps, numdevs);
450 if (sbi->data_map.odm_raid_algorithm != PNFS_OSD_RAID_0) {
451 EXOFS_ERR("Only RAID_0 for now\n");
454 if (0 != (numdevs % (sbi->data_map.odm_mirror_cnt + 1))) {
455 EXOFS_ERR("Data Map wrong, numdevs=%d mirrors=%d\n",
456 numdevs, sbi->data_map.odm_mirror_cnt);
460 if (0 != (sbi->data_map.odm_stripe_unit & ~PAGE_MASK)) {
461 EXOFS_ERR("Stripe Unit(0x%llx)"
462 " must be Multples of PAGE_SIZE(0x%lx)\n",
463 _LLU(sbi->data_map.odm_stripe_unit), PAGE_SIZE);
467 sbi->layout.stripe_unit = sbi->data_map.odm_stripe_unit;
468 sbi->layout.mirrors_p1 = sbi->data_map.odm_mirror_cnt + 1;
470 if (sbi->data_map.odm_group_width) {
471 sbi->layout.group_width = sbi->data_map.odm_group_width;
472 sbi->layout.group_depth = sbi->data_map.odm_group_depth;
473 if (!sbi->layout.group_depth) {
474 EXOFS_ERR("group_depth == 0 && group_width != 0\n");
477 sbi->layout.group_count = sbi->data_map.odm_num_comps /
478 sbi->layout.mirrors_p1 /
479 sbi->data_map.odm_group_width;
481 if (sbi->data_map.odm_group_depth) {
482 printk(KERN_NOTICE "Warning: group_depth ignored "
483 "group_width == 0 && group_depth == %d\n",
484 sbi->data_map.odm_group_depth);
485 sbi->data_map.odm_group_depth = 0;
487 sbi->layout.group_width = sbi->data_map.odm_num_comps /
488 sbi->layout.mirrors_p1;
489 sbi->layout.group_depth = -1;
490 sbi->layout.group_count = 1;
493 stripe_length = (u64)sbi->layout.group_width * sbi->layout.stripe_unit;
494 if (stripe_length >= (1ULL << 32)) {
495 EXOFS_ERR("Total Stripe length(0x%llx)"
496 " >= 32bit is not supported\n", _LLU(stripe_length));
503 static unsigned __ra_pages(struct exofs_layout *layout)
505 const unsigned _MIN_RA = 32; /* min 128K read-ahead */
506 unsigned ra_pages = layout->group_width * layout->stripe_unit /
508 unsigned max_io_pages = exofs_max_io_pages(layout, ~0);
510 ra_pages *= 2; /* two stripes */
511 if (ra_pages < _MIN_RA)
512 ra_pages = roundup(_MIN_RA, ra_pages / 2);
514 if (ra_pages > max_io_pages)
515 ra_pages = max_io_pages;
520 /* @odi is valid only as long as @fscb_dev is valid */
521 static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev,
522 struct osd_dev_info *odi)
524 odi->systemid_len = le32_to_cpu(dt_dev->systemid_len);
525 memcpy(odi->systemid, dt_dev->systemid, odi->systemid_len);
527 odi->osdname_len = le32_to_cpu(dt_dev->osdname_len);
528 odi->osdname = dt_dev->osdname;
530 /* FIXME support long names. Will need a _put function */
531 if (dt_dev->long_name_offset)
534 /* Make sure osdname is printable!
535 * mkexofs should give us space for a null-terminator else the
536 * device-table is invalid.
538 if (unlikely(odi->osdname_len >= sizeof(dt_dev->osdname)))
539 odi->osdname_len = sizeof(dt_dev->osdname) - 1;
540 dt_dev->osdname[odi->osdname_len] = 0;
542 /* If it's all zeros something is bad we read past end-of-obj */
543 return !(odi->systemid_len || odi->osdname_len);
546 static int exofs_read_lookup_dev_table(struct exofs_sb_info **psbi,
547 unsigned table_count)
549 struct exofs_sb_info *sbi = *psbi;
550 struct osd_dev *fscb_od;
551 struct osd_obj_id obj = {.partition = sbi->layout.s_pid,
552 .id = EXOFS_DEVTABLE_ID};
553 struct exofs_device_table *dt;
554 unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) +
559 dt = kmalloc(table_bytes, GFP_KERNEL);
561 EXOFS_ERR("ERROR: allocating %x bytes for device table\n",
566 fscb_od = sbi->layout.s_ods[0];
567 sbi->layout.s_ods[0] = NULL;
568 sbi->layout.s_numdevs = 0;
569 ret = exofs_read_kern(fscb_od, sbi->s_cred, &obj, 0, dt, table_bytes);
571 EXOFS_ERR("ERROR: reading device table\n");
575 numdevs = le64_to_cpu(dt->dt_num_devices);
576 if (unlikely(!numdevs)) {
580 WARN_ON(table_count != numdevs);
582 ret = _read_and_match_data_map(sbi, numdevs, dt);
586 if (likely(numdevs > 1)) {
587 unsigned size = numdevs * sizeof(sbi->layout.s_ods[0]);
589 sbi = krealloc(sbi, sizeof(*sbi) + size, GFP_KERNEL);
590 if (unlikely(!sbi)) {
594 memset(&sbi->layout.s_ods[1], 0,
595 size - sizeof(sbi->layout.s_ods[0]));
599 for (i = 0; i < numdevs; i++) {
600 struct exofs_fscb fscb;
601 struct osd_dev_info odi;
604 if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) {
605 EXOFS_ERR("ERROR: Read all-zeros device entry\n");
610 printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n",
613 /* On all devices the device table is identical. The user can
614 * specify any one of the participating devices on the command
615 * line. We always keep them in device-table order.
617 if (fscb_od && osduld_device_same(fscb_od, &odi)) {
618 sbi->layout.s_ods[i] = fscb_od;
619 ++sbi->layout.s_numdevs;
624 od = osduld_info_lookup(&odi);
627 EXOFS_ERR("ERROR: device requested is not found "
628 "osd_name-%s =>%d\n", odi.osdname, ret);
632 sbi->layout.s_ods[i] = od;
633 ++sbi->layout.s_numdevs;
635 /* Read the fscb of the other devices to make sure the FS
636 * partition is there.
638 ret = exofs_read_kern(od, sbi->s_cred, &obj, 0, &fscb,
641 EXOFS_ERR("ERROR: Malformed participating device "
642 "error reading fscb osd_name-%s\n",
647 /* TODO: verify other information is correct and FS-uuid
648 * matches. Benny what did you say about device table
649 * generation and old devices?
655 if (unlikely(!ret && fscb_od)) {
657 "ERROR: Bad device-table container device not present\n");
658 osduld_put_device(fscb_od);
666 * Read the superblock from the OSD and fill in the fields
668 static int exofs_fill_super(struct super_block *sb, void *data, int silent)
671 struct exofs_mountopt *opts = data;
672 struct exofs_sb_info *sbi; /*extended info */
673 struct osd_dev *od; /* Master device */
674 struct exofs_fscb fscb; /*on-disk superblock info */
675 struct osd_obj_id obj;
676 unsigned table_count;
679 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
683 ret = bdi_setup_and_register(&sbi->bdi, "exofs", BDI_CAP_MAP_COPY);
687 /* use mount options to fill superblock */
688 if (opts->is_osdname) {
689 struct osd_dev_info odi = {.systemid_len = 0};
691 odi.osdname_len = strlen(opts->dev_name);
692 odi.osdname = (u8 *)opts->dev_name;
693 od = osduld_info_lookup(&odi);
695 od = osduld_path_lookup(opts->dev_name);
702 /* Default layout in case we do not have a device-table */
703 sbi->layout.stripe_unit = PAGE_SIZE;
704 sbi->layout.mirrors_p1 = 1;
705 sbi->layout.group_width = 1;
706 sbi->layout.group_depth = -1;
707 sbi->layout.group_count = 1;
708 sbi->layout.s_ods[0] = od;
709 sbi->layout.s_numdevs = 1;
710 sbi->layout.s_pid = opts->pid;
711 sbi->s_timeout = opts->timeout;
713 /* fill in some other data by hand */
714 memset(sb->s_id, 0, sizeof(sb->s_id));
715 strcpy(sb->s_id, "exofs");
716 sb->s_blocksize = EXOFS_BLKSIZE;
717 sb->s_blocksize_bits = EXOFS_BLKSHIFT;
718 sb->s_maxbytes = MAX_LFS_FILESIZE;
719 atomic_set(&sbi->s_curr_pending, 0);
723 obj.partition = sbi->layout.s_pid;
724 obj.id = EXOFS_SUPER_ID;
725 exofs_make_credential(sbi->s_cred, &obj);
727 ret = exofs_read_kern(od, sbi->s_cred, &obj, 0, &fscb, sizeof(fscb));
731 sb->s_magic = le16_to_cpu(fscb.s_magic);
732 /* NOTE: we read below to be backward compatible with old versions */
733 sbi->s_nextid = le64_to_cpu(fscb.s_nextid);
734 sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles);
736 /* make sure what we read from the object store is correct */
737 if (sb->s_magic != EXOFS_SUPER_MAGIC) {
739 EXOFS_ERR("ERROR: Bad magic value\n");
743 if (le32_to_cpu(fscb.s_version) > EXOFS_FSCB_VER) {
744 EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n",
745 EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version));
750 /* start generation numbers from a random point */
751 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
752 spin_lock_init(&sbi->s_next_gen_lock);
754 table_count = le64_to_cpu(fscb.s_dev_table_count);
756 ret = exofs_read_lookup_dev_table(&sbi, table_count);
761 __sbi_read_stats(sbi);
763 /* set up operation vectors */
764 sbi->bdi.ra_pages = __ra_pages(&sbi->layout);
765 sb->s_bdi = &sbi->bdi;
767 sb->s_op = &exofs_sops;
768 sb->s_export_op = &exofs_export_ops;
769 root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF);
771 EXOFS_ERR("ERROR: exofs_iget failed\n");
775 sb->s_root = d_alloc_root(root);
778 EXOFS_ERR("ERROR: get root inode failed\n");
783 if (!S_ISDIR(root->i_mode)) {
786 EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n",
792 _exofs_print_device("Mounting", opts->dev_name, sbi->layout.s_ods[0],
794 if (opts->is_osdname)
795 kfree(opts->dev_name);
799 bdi_destroy(&sbi->bdi);
801 EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
802 opts->dev_name, sbi->layout.s_pid, ret);
804 if (opts->is_osdname)
805 kfree(opts->dev_name);
810 * Set up the superblock (calls exofs_fill_super eventually)
812 static struct dentry *exofs_mount(struct file_system_type *type,
813 int flags, const char *dev_name,
816 struct exofs_mountopt opts;
819 ret = parse_options(data, &opts);
824 opts.dev_name = dev_name;
825 return mount_nodev(type, flags, &opts, exofs_fill_super);
829 * Return information about the file system state in the buffer. This is used
830 * by the 'df' command, for example.
832 static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf)
834 struct super_block *sb = dentry->d_sb;
835 struct exofs_sb_info *sbi = sb->s_fs_info;
836 struct exofs_io_state *ios;
837 struct osd_attr attrs[] = {
838 ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS,
839 OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)),
840 ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION,
841 OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)),
843 uint64_t capacity = ULLONG_MAX;
844 uint64_t used = ULLONG_MAX;
845 uint8_t cred_a[OSD_CAP_LEN];
848 ret = exofs_get_io_state(&sbi->layout, &ios);
850 EXOFS_DBGMSG("exofs_get_io_state failed.\n");
854 exofs_make_credential(cred_a, &ios->obj);
855 ios->cred = sbi->s_cred;
856 ios->in_attr = attrs;
857 ios->in_attr_len = ARRAY_SIZE(attrs);
859 ret = exofs_sbi_read(ios);
863 ret = extract_attr_from_ios(ios, &attrs[0]);
865 capacity = get_unaligned_be64(attrs[0].val_ptr);
866 if (unlikely(!capacity))
867 capacity = ULLONG_MAX;
869 EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");
871 ret = extract_attr_from_ios(ios, &attrs[1]);
873 used = get_unaligned_be64(attrs[1].val_ptr);
875 EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n");
877 /* fill in the stats buffer */
878 buf->f_type = EXOFS_SUPER_MAGIC;
879 buf->f_bsize = EXOFS_BLKSIZE;
880 buf->f_blocks = capacity >> 9;
881 buf->f_bfree = (capacity - used) >> 9;
882 buf->f_bavail = buf->f_bfree;
883 buf->f_files = sbi->s_numfiles;
884 buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles;
885 buf->f_namelen = EXOFS_NAME_LEN;
888 exofs_put_io_state(ios);
892 static const struct super_operations exofs_sops = {
893 .alloc_inode = exofs_alloc_inode,
894 .destroy_inode = exofs_destroy_inode,
895 .write_inode = exofs_write_inode,
896 .evict_inode = exofs_evict_inode,
897 .put_super = exofs_put_super,
898 .write_super = exofs_write_super,
899 .sync_fs = exofs_sync_fs,
900 .statfs = exofs_statfs,
903 /******************************************************************************
905 *****************************************************************************/
907 struct dentry *exofs_get_parent(struct dentry *child)
909 unsigned long ino = exofs_parent_ino(child);
914 return d_obtain_alias(exofs_iget(child->d_inode->i_sb, ino));
917 static struct inode *exofs_nfs_get_inode(struct super_block *sb,
918 u64 ino, u32 generation)
922 inode = exofs_iget(sb, ino);
924 return ERR_CAST(inode);
925 if (generation && inode->i_generation != generation) {
926 /* we didn't find the right inode.. */
928 return ERR_PTR(-ESTALE);
933 static struct dentry *exofs_fh_to_dentry(struct super_block *sb,
934 struct fid *fid, int fh_len, int fh_type)
936 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
937 exofs_nfs_get_inode);
940 static struct dentry *exofs_fh_to_parent(struct super_block *sb,
941 struct fid *fid, int fh_len, int fh_type)
943 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
944 exofs_nfs_get_inode);
947 static const struct export_operations exofs_export_ops = {
948 .fh_to_dentry = exofs_fh_to_dentry,
949 .fh_to_parent = exofs_fh_to_parent,
950 .get_parent = exofs_get_parent,
953 /******************************************************************************
955 *****************************************************************************/
958 * struct that describes this file system
960 static struct file_system_type exofs_type = {
961 .owner = THIS_MODULE,
963 .mount = exofs_mount,
964 .kill_sb = generic_shutdown_super,
967 static int __init init_exofs(void)
971 err = init_inodecache();
975 err = register_filesystem(&exofs_type);
981 destroy_inodecache();
986 static void __exit exit_exofs(void)
988 unregister_filesystem(&exofs_type);
989 destroy_inodecache();
992 MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>");
993 MODULE_DESCRIPTION("exofs");
994 MODULE_LICENSE("GPL");
996 module_init(init_exofs)
997 module_exit(exit_exofs)