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
{
57 * exofs-specific mount-time options.
59 enum { Opt_pid
, Opt_to
, Opt_mkfs
, Opt_format
, Opt_err
};
62 * Our mount-time options. These should ideally be 64-bit unsigned, but the
63 * kernel's parsing functions do not currently support that. 32-bit should be
64 * sufficient for most applications now.
66 static match_table_t tokens
= {
73 * The main option parsing method. Also makes sure that all of the mandatory
74 * mount options were set.
76 static int parse_options(char *options
, struct exofs_mountopt
*opts
)
79 substring_t args
[MAX_OPT_ARGS
];
83 EXOFS_DBGMSG("parse_options %s\n", options
);
85 memset(opts
, 0, sizeof(*opts
));
86 opts
->timeout
= BLK_DEFAULT_SG_TIMEOUT
;
88 while ((p
= strsep(&options
, ",")) != NULL
) {
95 token
= match_token(p
, tokens
, args
);
98 if (0 == match_strlcpy(str
, &args
[0], sizeof(str
)))
100 opts
->pid
= simple_strtoull(str
, NULL
, 0);
101 if (opts
->pid
< EXOFS_MIN_PID
) {
102 EXOFS_ERR("Partition ID must be >= %u",
109 if (match_int(&args
[0], &option
))
112 EXOFS_ERR("Timout must be > 0");
115 opts
->timeout
= option
* HZ
;
121 EXOFS_ERR("Need to specify the following options:\n");
122 EXOFS_ERR(" -o pid=pid_no_to_use\n");
129 /******************************************************************************
131 *****************************************************************************/
134 * Our inode cache. Isn't it pretty?
136 static struct kmem_cache
*exofs_inode_cachep
;
139 * Allocate an inode in the cache
141 static struct inode
*exofs_alloc_inode(struct super_block
*sb
)
143 struct exofs_i_info
*oi
;
145 oi
= kmem_cache_alloc(exofs_inode_cachep
, GFP_KERNEL
);
149 oi
->vfs_inode
.i_version
= 1;
150 return &oi
->vfs_inode
;
154 * Remove an inode from the cache
156 static void exofs_destroy_inode(struct inode
*inode
)
158 kmem_cache_free(exofs_inode_cachep
, exofs_i(inode
));
162 * Initialize the inode
164 static void exofs_init_once(void *foo
)
166 struct exofs_i_info
*oi
= foo
;
168 inode_init_once(&oi
->vfs_inode
);
172 * Create and initialize the inode cache
174 static int init_inodecache(void)
176 exofs_inode_cachep
= kmem_cache_create("exofs_inode_cache",
177 sizeof(struct exofs_i_info
), 0,
178 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
,
180 if (exofs_inode_cachep
== NULL
)
186 * Destroy the inode cache
188 static void destroy_inodecache(void)
190 kmem_cache_destroy(exofs_inode_cachep
);
193 /******************************************************************************
194 * SUPERBLOCK FUNCTIONS
195 *****************************************************************************/
196 static const struct super_operations exofs_sops
;
197 static const struct export_operations exofs_export_ops
;
200 * Write the superblock to the OSD
202 int exofs_sync_fs(struct super_block
*sb
, int wait
)
204 struct exofs_sb_info
*sbi
;
205 struct exofs_fscb
*fscb
;
206 struct exofs_io_state
*ios
;
213 ret
= exofs_get_io_state(&sbi
->layout
, &ios
);
217 /* Note: We only write the changing part of the fscb. .i.e upto the
218 * the fscb->s_dev_table_oid member. There is no read-modify-write
221 ios
->length
= offsetof(struct exofs_fscb
, s_dev_table_oid
);
222 memset(fscb
, 0, ios
->length
);
223 fscb
->s_nextid
= cpu_to_le64(sbi
->s_nextid
);
224 fscb
->s_numfiles
= cpu_to_le32(sbi
->s_numfiles
);
225 fscb
->s_magic
= cpu_to_le16(sb
->s_magic
);
227 fscb
->s_version
= EXOFS_FSCB_VER
;
229 ios
->obj
.id
= EXOFS_SUPER_ID
;
231 ios
->kern_buff
= fscb
;
232 ios
->cred
= sbi
->s_cred
;
234 ret
= exofs_sbi_write(ios
);
236 EXOFS_ERR("%s: exofs_sbi_write failed.\n", __func__
);
242 EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi
->s_nextid
), ret
);
243 exofs_put_io_state(ios
);
248 static void exofs_write_super(struct super_block
*sb
)
250 if (!(sb
->s_flags
& MS_RDONLY
))
251 exofs_sync_fs(sb
, 1);
256 static void _exofs_print_device(const char *msg
, const char *dev_path
,
257 struct osd_dev
*od
, u64 pid
)
259 const struct osd_dev_info
*odi
= osduld_device_info(od
);
261 printk(KERN_NOTICE
"exofs: %s %s osd_name-%s pid-0x%llx\n",
262 msg
, dev_path
?: "", odi
->osdname
, _LLU(pid
));
265 void exofs_free_sbi(struct exofs_sb_info
*sbi
)
267 while (sbi
->layout
.s_numdevs
) {
268 int i
= --sbi
->layout
.s_numdevs
;
269 struct osd_dev
*od
= sbi
->layout
.s_ods
[i
];
272 sbi
->layout
.s_ods
[i
] = NULL
;
273 osduld_put_device(od
);
280 * This function is called when the vfs is freeing the superblock. We just
281 * need to free our own part.
283 static void exofs_put_super(struct super_block
*sb
)
286 struct exofs_sb_info
*sbi
= sb
->s_fs_info
;
289 exofs_write_super(sb
);
291 /* make sure there are no pending commands */
292 for (num_pend
= atomic_read(&sbi
->s_curr_pending
); num_pend
> 0;
293 num_pend
= atomic_read(&sbi
->s_curr_pending
)) {
294 wait_queue_head_t wq
;
295 init_waitqueue_head(&wq
);
296 wait_event_timeout(wq
,
297 (atomic_read(&sbi
->s_curr_pending
) == 0),
298 msecs_to_jiffies(100));
301 _exofs_print_device("Unmounting", NULL
, sbi
->layout
.s_ods
[0],
304 bdi_destroy(&sbi
->bdi
);
306 sb
->s_fs_info
= NULL
;
309 static int _read_and_match_data_map(struct exofs_sb_info
*sbi
, unsigned numdevs
,
310 struct exofs_device_table
*dt
)
314 sbi
->data_map
.odm_num_comps
=
315 le32_to_cpu(dt
->dt_data_map
.cb_num_comps
);
316 sbi
->data_map
.odm_stripe_unit
=
317 le64_to_cpu(dt
->dt_data_map
.cb_stripe_unit
);
318 sbi
->data_map
.odm_group_width
=
319 le32_to_cpu(dt
->dt_data_map
.cb_group_width
);
320 sbi
->data_map
.odm_group_depth
=
321 le32_to_cpu(dt
->dt_data_map
.cb_group_depth
);
322 sbi
->data_map
.odm_mirror_cnt
=
323 le32_to_cpu(dt
->dt_data_map
.cb_mirror_cnt
);
324 sbi
->data_map
.odm_raid_algorithm
=
325 le32_to_cpu(dt
->dt_data_map
.cb_raid_algorithm
);
327 if (sbi
->data_map
.odm_num_comps
!= numdevs
) {
328 EXOFS_ERR("odm_num_comps(%u) != numdevs(%u)\n",
329 sbi
->data_map
.odm_num_comps
, numdevs
);
332 if (sbi
->data_map
.odm_raid_algorithm
!= PNFS_OSD_RAID_0
) {
333 EXOFS_ERR("Only RAID_0 for now\n");
336 if (0 != (numdevs
% (sbi
->data_map
.odm_mirror_cnt
+ 1))) {
337 EXOFS_ERR("Data Map wrong, numdevs=%d mirrors=%d\n",
338 numdevs
, sbi
->data_map
.odm_mirror_cnt
);
342 if (0 != (sbi
->data_map
.odm_stripe_unit
& ~PAGE_MASK
)) {
343 EXOFS_ERR("Stripe Unit(0x%llx)"
344 " must be Multples of PAGE_SIZE(0x%lx)\n",
345 _LLU(sbi
->data_map
.odm_stripe_unit
), PAGE_SIZE
);
349 sbi
->layout
.stripe_unit
= sbi
->data_map
.odm_stripe_unit
;
350 sbi
->layout
.mirrors_p1
= sbi
->data_map
.odm_mirror_cnt
+ 1;
352 if (sbi
->data_map
.odm_group_width
) {
353 sbi
->layout
.group_width
= sbi
->data_map
.odm_group_width
;
354 sbi
->layout
.group_depth
= sbi
->data_map
.odm_group_depth
;
355 if (!sbi
->layout
.group_depth
) {
356 EXOFS_ERR("group_depth == 0 && group_width != 0\n");
359 sbi
->layout
.group_count
= sbi
->data_map
.odm_num_comps
/
360 sbi
->layout
.mirrors_p1
/
361 sbi
->data_map
.odm_group_width
;
363 if (sbi
->data_map
.odm_group_depth
) {
364 printk(KERN_NOTICE
"Warning: group_depth ignored "
365 "group_width == 0 && group_depth == %d\n",
366 sbi
->data_map
.odm_group_depth
);
367 sbi
->data_map
.odm_group_depth
= 0;
369 sbi
->layout
.group_width
= sbi
->data_map
.odm_num_comps
/
370 sbi
->layout
.mirrors_p1
;
371 sbi
->layout
.group_depth
= -1;
372 sbi
->layout
.group_count
= 1;
375 stripe_length
= (u64
)sbi
->layout
.group_width
* sbi
->layout
.stripe_unit
;
376 if (stripe_length
>= (1ULL << 32)) {
377 EXOFS_ERR("Total Stripe length(0x%llx)"
378 " >= 32bit is not supported\n", _LLU(stripe_length
));
385 /* @odi is valid only as long as @fscb_dev is valid */
386 static int exofs_devs_2_odi(struct exofs_dt_device_info
*dt_dev
,
387 struct osd_dev_info
*odi
)
389 odi
->systemid_len
= le32_to_cpu(dt_dev
->systemid_len
);
390 memcpy(odi
->systemid
, dt_dev
->systemid
, odi
->systemid_len
);
392 odi
->osdname_len
= le32_to_cpu(dt_dev
->osdname_len
);
393 odi
->osdname
= dt_dev
->osdname
;
395 if (dt_dev
->long_name_offset
)
398 /* Make sure osdname is printable!
399 * mkexofs should give us space for a null-terminator else the
400 * device-table is invalid.
402 if (unlikely(odi
->osdname_len
>= sizeof(dt_dev
->osdname
)))
403 odi
->osdname_len
= sizeof(dt_dev
->osdname
) - 1;
404 dt_dev
->osdname
[odi
->osdname_len
] = 0;
406 /* If it's all zeros something is bad we read past end-of-obj */
407 return !(odi
->systemid_len
|| odi
->osdname_len
);
410 static int exofs_read_lookup_dev_table(struct exofs_sb_info
**psbi
,
411 unsigned table_count
)
413 struct exofs_sb_info
*sbi
= *psbi
;
414 struct osd_dev
*fscb_od
;
415 struct osd_obj_id obj
= {.partition
= sbi
->layout
.s_pid
,
416 .id
= EXOFS_DEVTABLE_ID
};
417 struct exofs_device_table
*dt
;
418 unsigned table_bytes
= table_count
* sizeof(dt
->dt_dev_table
[0]) +
423 dt
= kmalloc(table_bytes
, GFP_KERNEL
);
425 EXOFS_ERR("ERROR: allocating %x bytes for device table\n",
430 fscb_od
= sbi
->layout
.s_ods
[0];
431 sbi
->layout
.s_ods
[0] = NULL
;
432 sbi
->layout
.s_numdevs
= 0;
433 ret
= exofs_read_kern(fscb_od
, sbi
->s_cred
, &obj
, 0, dt
, table_bytes
);
435 EXOFS_ERR("ERROR: reading device table\n");
439 numdevs
= le64_to_cpu(dt
->dt_num_devices
);
440 if (unlikely(!numdevs
)) {
444 WARN_ON(table_count
!= numdevs
);
446 ret
= _read_and_match_data_map(sbi
, numdevs
, dt
);
450 if (likely(numdevs
> 1)) {
451 unsigned size
= numdevs
* sizeof(sbi
->layout
.s_ods
[0]);
453 sbi
= krealloc(sbi
, sizeof(*sbi
) + size
, GFP_KERNEL
);
454 if (unlikely(!sbi
)) {
458 memset(&sbi
->layout
.s_ods
[1], 0,
459 size
- sizeof(sbi
->layout
.s_ods
[0]));
463 for (i
= 0; i
< numdevs
; i
++) {
464 struct exofs_fscb fscb
;
465 struct osd_dev_info odi
;
468 if (exofs_devs_2_odi(&dt
->dt_dev_table
[i
], &odi
)) {
469 EXOFS_ERR("ERROR: Read all-zeros device entry\n");
474 printk(KERN_NOTICE
"Add device[%d]: osd_name-%s\n",
477 /* On all devices the device table is identical. The user can
478 * specify any one of the participating devices on the command
479 * line. We always keep them in device-table order.
481 if (fscb_od
&& osduld_device_same(fscb_od
, &odi
)) {
482 sbi
->layout
.s_ods
[i
] = fscb_od
;
483 ++sbi
->layout
.s_numdevs
;
488 od
= osduld_info_lookup(&odi
);
489 if (unlikely(IS_ERR(od
))) {
491 EXOFS_ERR("ERROR: device requested is not found "
492 "osd_name-%s =>%d\n", odi
.osdname
, ret
);
496 sbi
->layout
.s_ods
[i
] = od
;
497 ++sbi
->layout
.s_numdevs
;
499 /* Read the fscb of the other devices to make sure the FS
500 * partition is there.
502 ret
= exofs_read_kern(od
, sbi
->s_cred
, &obj
, 0, &fscb
,
505 EXOFS_ERR("ERROR: Malformed participating device "
506 "error reading fscb osd_name-%s\n",
511 /* TODO: verify other information is correct and FS-uuid
512 * matches. Benny what did you say about device table
513 * generation and old devices?
519 if (unlikely(!ret
&& fscb_od
)) {
521 "ERROR: Bad device-table container device not present\n");
522 osduld_put_device(fscb_od
);
530 * Read the superblock from the OSD and fill in the fields
532 static int exofs_fill_super(struct super_block
*sb
, void *data
, int silent
)
535 struct exofs_mountopt
*opts
= data
;
536 struct exofs_sb_info
*sbi
; /*extended info */
537 struct osd_dev
*od
; /* Master device */
538 struct exofs_fscb fscb
; /*on-disk superblock info */
539 struct osd_obj_id obj
;
540 unsigned table_count
;
543 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
547 ret
= bdi_setup_and_register(&sbi
->bdi
, "exofs", BDI_CAP_MAP_COPY
);
551 /* use mount options to fill superblock */
552 od
= osduld_path_lookup(opts
->dev_name
);
558 /* Default layout in case we do not have a device-table */
559 sbi
->layout
.stripe_unit
= PAGE_SIZE
;
560 sbi
->layout
.mirrors_p1
= 1;
561 sbi
->layout
.group_width
= 1;
562 sbi
->layout
.group_depth
= -1;
563 sbi
->layout
.group_count
= 1;
564 sbi
->layout
.s_ods
[0] = od
;
565 sbi
->layout
.s_numdevs
= 1;
566 sbi
->layout
.s_pid
= opts
->pid
;
567 sbi
->s_timeout
= opts
->timeout
;
569 /* fill in some other data by hand */
570 memset(sb
->s_id
, 0, sizeof(sb
->s_id
));
571 strcpy(sb
->s_id
, "exofs");
572 sb
->s_blocksize
= EXOFS_BLKSIZE
;
573 sb
->s_blocksize_bits
= EXOFS_BLKSHIFT
;
574 sb
->s_maxbytes
= MAX_LFS_FILESIZE
;
575 atomic_set(&sbi
->s_curr_pending
, 0);
579 obj
.partition
= sbi
->layout
.s_pid
;
580 obj
.id
= EXOFS_SUPER_ID
;
581 exofs_make_credential(sbi
->s_cred
, &obj
);
583 ret
= exofs_read_kern(od
, sbi
->s_cred
, &obj
, 0, &fscb
, sizeof(fscb
));
587 sb
->s_magic
= le16_to_cpu(fscb
.s_magic
);
588 sbi
->s_nextid
= le64_to_cpu(fscb
.s_nextid
);
589 sbi
->s_numfiles
= le32_to_cpu(fscb
.s_numfiles
);
591 /* make sure what we read from the object store is correct */
592 if (sb
->s_magic
!= EXOFS_SUPER_MAGIC
) {
594 EXOFS_ERR("ERROR: Bad magic value\n");
598 if (le32_to_cpu(fscb
.s_version
) != EXOFS_FSCB_VER
) {
599 EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n",
600 EXOFS_FSCB_VER
, le32_to_cpu(fscb
.s_version
));
605 /* start generation numbers from a random point */
606 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
607 spin_lock_init(&sbi
->s_next_gen_lock
);
609 table_count
= le64_to_cpu(fscb
.s_dev_table_count
);
611 ret
= exofs_read_lookup_dev_table(&sbi
, table_count
);
616 /* set up operation vectors */
617 sb
->s_bdi
= &sbi
->bdi
;
619 sb
->s_op
= &exofs_sops
;
620 sb
->s_export_op
= &exofs_export_ops
;
621 root
= exofs_iget(sb
, EXOFS_ROOT_ID
- EXOFS_OBJ_OFF
);
623 EXOFS_ERR("ERROR: exofs_iget failed\n");
627 sb
->s_root
= d_alloc_root(root
);
630 EXOFS_ERR("ERROR: get root inode failed\n");
635 if (!S_ISDIR(root
->i_mode
)) {
638 EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n",
644 _exofs_print_device("Mounting", opts
->dev_name
, sbi
->layout
.s_ods
[0],
649 bdi_destroy(&sbi
->bdi
);
651 EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
652 opts
->dev_name
, sbi
->layout
.s_pid
, ret
);
658 * Set up the superblock (calls exofs_fill_super eventually)
660 static int exofs_get_sb(struct file_system_type
*type
,
661 int flags
, const char *dev_name
,
662 void *data
, struct vfsmount
*mnt
)
664 struct exofs_mountopt opts
;
667 ret
= parse_options(data
, &opts
);
671 opts
.dev_name
= dev_name
;
672 return get_sb_nodev(type
, flags
, &opts
, exofs_fill_super
, mnt
);
676 * Return information about the file system state in the buffer. This is used
677 * by the 'df' command, for example.
679 static int exofs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
681 struct super_block
*sb
= dentry
->d_sb
;
682 struct exofs_sb_info
*sbi
= sb
->s_fs_info
;
683 struct exofs_io_state
*ios
;
684 struct osd_attr attrs
[] = {
685 ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS
,
686 OSD_ATTR_PQ_CAPACITY_QUOTA
, sizeof(__be64
)),
687 ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION
,
688 OSD_ATTR_PI_USED_CAPACITY
, sizeof(__be64
)),
690 uint64_t capacity
= ULLONG_MAX
;
691 uint64_t used
= ULLONG_MAX
;
692 uint8_t cred_a
[OSD_CAP_LEN
];
695 ret
= exofs_get_io_state(&sbi
->layout
, &ios
);
697 EXOFS_DBGMSG("exofs_get_io_state failed.\n");
701 exofs_make_credential(cred_a
, &ios
->obj
);
702 ios
->cred
= sbi
->s_cred
;
703 ios
->in_attr
= attrs
;
704 ios
->in_attr_len
= ARRAY_SIZE(attrs
);
706 ret
= exofs_sbi_read(ios
);
710 ret
= extract_attr_from_ios(ios
, &attrs
[0]);
712 capacity
= get_unaligned_be64(attrs
[0].val_ptr
);
713 if (unlikely(!capacity
))
714 capacity
= ULLONG_MAX
;
716 EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");
718 ret
= extract_attr_from_ios(ios
, &attrs
[1]);
720 used
= get_unaligned_be64(attrs
[1].val_ptr
);
722 EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n");
724 /* fill in the stats buffer */
725 buf
->f_type
= EXOFS_SUPER_MAGIC
;
726 buf
->f_bsize
= EXOFS_BLKSIZE
;
727 buf
->f_blocks
= capacity
>> 9;
728 buf
->f_bfree
= (capacity
- used
) >> 9;
729 buf
->f_bavail
= buf
->f_bfree
;
730 buf
->f_files
= sbi
->s_numfiles
;
731 buf
->f_ffree
= EXOFS_MAX_ID
- sbi
->s_numfiles
;
732 buf
->f_namelen
= EXOFS_NAME_LEN
;
735 exofs_put_io_state(ios
);
739 static const struct super_operations exofs_sops
= {
740 .alloc_inode
= exofs_alloc_inode
,
741 .destroy_inode
= exofs_destroy_inode
,
742 .write_inode
= exofs_write_inode
,
743 .evict_inode
= exofs_evict_inode
,
744 .put_super
= exofs_put_super
,
745 .write_super
= exofs_write_super
,
746 .sync_fs
= exofs_sync_fs
,
747 .statfs
= exofs_statfs
,
750 /******************************************************************************
752 *****************************************************************************/
754 struct dentry
*exofs_get_parent(struct dentry
*child
)
756 unsigned long ino
= exofs_parent_ino(child
);
761 return d_obtain_alias(exofs_iget(child
->d_inode
->i_sb
, ino
));
764 static struct inode
*exofs_nfs_get_inode(struct super_block
*sb
,
765 u64 ino
, u32 generation
)
769 inode
= exofs_iget(sb
, ino
);
771 return ERR_CAST(inode
);
772 if (generation
&& inode
->i_generation
!= generation
) {
773 /* we didn't find the right inode.. */
775 return ERR_PTR(-ESTALE
);
780 static struct dentry
*exofs_fh_to_dentry(struct super_block
*sb
,
781 struct fid
*fid
, int fh_len
, int fh_type
)
783 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
784 exofs_nfs_get_inode
);
787 static struct dentry
*exofs_fh_to_parent(struct super_block
*sb
,
788 struct fid
*fid
, int fh_len
, int fh_type
)
790 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
791 exofs_nfs_get_inode
);
794 static const struct export_operations exofs_export_ops
= {
795 .fh_to_dentry
= exofs_fh_to_dentry
,
796 .fh_to_parent
= exofs_fh_to_parent
,
797 .get_parent
= exofs_get_parent
,
800 /******************************************************************************
802 *****************************************************************************/
805 * struct that describes this file system
807 static struct file_system_type exofs_type
= {
808 .owner
= THIS_MODULE
,
810 .get_sb
= exofs_get_sb
,
811 .kill_sb
= generic_shutdown_super
,
814 static int __init
init_exofs(void)
818 err
= init_inodecache();
822 err
= register_filesystem(&exofs_type
);
828 destroy_inodecache();
833 static void __exit
exit_exofs(void)
835 unregister_filesystem(&exofs_type
);
836 destroy_inodecache();
839 MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>");
840 MODULE_DESCRIPTION("exofs");
841 MODULE_LICENSE("GPL");
843 module_init(init_exofs
)
844 module_exit(exit_exofs
)