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/smp_lock.h>
35 #include <linux/string.h>
36 #include <linux/parser.h>
37 #include <linux/vfs.h>
38 #include <linux/random.h>
39 #include <linux/exportfs.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],
305 sb
->s_fs_info
= NULL
;
308 static int _read_and_match_data_map(struct exofs_sb_info
*sbi
, unsigned numdevs
,
309 struct exofs_device_table
*dt
)
313 sbi
->data_map
.odm_num_comps
=
314 le32_to_cpu(dt
->dt_data_map
.cb_num_comps
);
315 sbi
->data_map
.odm_stripe_unit
=
316 le64_to_cpu(dt
->dt_data_map
.cb_stripe_unit
);
317 sbi
->data_map
.odm_group_width
=
318 le32_to_cpu(dt
->dt_data_map
.cb_group_width
);
319 sbi
->data_map
.odm_group_depth
=
320 le32_to_cpu(dt
->dt_data_map
.cb_group_depth
);
321 sbi
->data_map
.odm_mirror_cnt
=
322 le32_to_cpu(dt
->dt_data_map
.cb_mirror_cnt
);
323 sbi
->data_map
.odm_raid_algorithm
=
324 le32_to_cpu(dt
->dt_data_map
.cb_raid_algorithm
);
326 /* FIXME: Only raid0 for now. if not so, do not mount */
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 /* FIXME support long names. Will need a _put function */
396 if (dt_dev
->long_name_offset
)
399 /* Make sure osdname is printable!
400 * mkexofs should give us space for a null-terminator else the
401 * device-table is invalid.
403 if (unlikely(odi
->osdname_len
>= sizeof(dt_dev
->osdname
)))
404 odi
->osdname_len
= sizeof(dt_dev
->osdname
) - 1;
405 dt_dev
->osdname
[odi
->osdname_len
] = 0;
407 /* If it's all zeros something is bad we read past end-of-obj */
408 return !(odi
->systemid_len
|| odi
->osdname_len
);
411 static int exofs_read_lookup_dev_table(struct exofs_sb_info
**psbi
,
412 unsigned table_count
)
414 struct exofs_sb_info
*sbi
= *psbi
;
415 struct osd_dev
*fscb_od
;
416 struct osd_obj_id obj
= {.partition
= sbi
->layout
.s_pid
,
417 .id
= EXOFS_DEVTABLE_ID
};
418 struct exofs_device_table
*dt
;
419 unsigned table_bytes
= table_count
* sizeof(dt
->dt_dev_table
[0]) +
424 dt
= kmalloc(table_bytes
, GFP_KERNEL
);
426 EXOFS_ERR("ERROR: allocating %x bytes for device table\n",
431 fscb_od
= sbi
->layout
.s_ods
[0];
432 sbi
->layout
.s_ods
[0] = NULL
;
433 sbi
->layout
.s_numdevs
= 0;
434 ret
= exofs_read_kern(fscb_od
, sbi
->s_cred
, &obj
, 0, dt
, table_bytes
);
436 EXOFS_ERR("ERROR: reading device table\n");
440 numdevs
= le64_to_cpu(dt
->dt_num_devices
);
441 if (unlikely(!numdevs
)) {
445 WARN_ON(table_count
!= numdevs
);
447 ret
= _read_and_match_data_map(sbi
, numdevs
, dt
);
451 if (likely(numdevs
> 1)) {
452 unsigned size
= numdevs
* sizeof(sbi
->layout
.s_ods
[0]);
454 sbi
= krealloc(sbi
, sizeof(*sbi
) + size
, GFP_KERNEL
);
455 if (unlikely(!sbi
)) {
459 memset(&sbi
->layout
.s_ods
[1], 0,
460 size
- sizeof(sbi
->layout
.s_ods
[0]));
464 for (i
= 0; i
< numdevs
; i
++) {
465 struct exofs_fscb fscb
;
466 struct osd_dev_info odi
;
469 if (exofs_devs_2_odi(&dt
->dt_dev_table
[i
], &odi
)) {
470 EXOFS_ERR("ERROR: Read all-zeros device entry\n");
475 printk(KERN_NOTICE
"Add device[%d]: osd_name-%s\n",
478 /* On all devices the device table is identical. The user can
479 * specify any one of the participating devices on the command
480 * line. We always keep them in device-table order.
482 if (fscb_od
&& osduld_device_same(fscb_od
, &odi
)) {
483 sbi
->layout
.s_ods
[i
] = fscb_od
;
484 ++sbi
->layout
.s_numdevs
;
489 od
= osduld_info_lookup(&odi
);
490 if (unlikely(IS_ERR(od
))) {
492 EXOFS_ERR("ERROR: device requested is not found "
493 "osd_name-%s =>%d\n", odi
.osdname
, ret
);
497 sbi
->layout
.s_ods
[i
] = od
;
498 ++sbi
->layout
.s_numdevs
;
500 /* Read the fscb of the other devices to make sure the FS
501 * partition is there.
503 ret
= exofs_read_kern(od
, sbi
->s_cred
, &obj
, 0, &fscb
,
506 EXOFS_ERR("ERROR: Malformed participating device "
507 "error reading fscb osd_name-%s\n",
512 /* TODO: verify other information is correct and FS-uuid
513 * matches. Benny what did you say about device table
514 * generation and old devices?
520 if (unlikely(!ret
&& fscb_od
)) {
522 "ERROR: Bad device-table container device not present\n");
523 osduld_put_device(fscb_od
);
531 * Read the superblock from the OSD and fill in the fields
533 static int exofs_fill_super(struct super_block
*sb
, void *data
, int silent
)
536 struct exofs_mountopt
*opts
= data
;
537 struct exofs_sb_info
*sbi
; /*extended info */
538 struct osd_dev
*od
; /* Master device */
539 struct exofs_fscb fscb
; /*on-disk superblock info */
540 struct osd_obj_id obj
;
541 unsigned table_count
;
544 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
548 /* use mount options to fill superblock */
549 od
= osduld_path_lookup(opts
->dev_name
);
555 /* Default layout in case we do not have a device-table */
556 sbi
->layout
.stripe_unit
= PAGE_SIZE
;
557 sbi
->layout
.mirrors_p1
= 1;
558 sbi
->layout
.group_width
= 1;
559 sbi
->layout
.group_depth
= -1;
560 sbi
->layout
.group_count
= 1;
561 sbi
->layout
.s_ods
[0] = od
;
562 sbi
->layout
.s_numdevs
= 1;
563 sbi
->layout
.s_pid
= opts
->pid
;
564 sbi
->s_timeout
= opts
->timeout
;
566 /* fill in some other data by hand */
567 memset(sb
->s_id
, 0, sizeof(sb
->s_id
));
568 strcpy(sb
->s_id
, "exofs");
569 sb
->s_blocksize
= EXOFS_BLKSIZE
;
570 sb
->s_blocksize_bits
= EXOFS_BLKSHIFT
;
571 sb
->s_maxbytes
= MAX_LFS_FILESIZE
;
572 atomic_set(&sbi
->s_curr_pending
, 0);
576 obj
.partition
= sbi
->layout
.s_pid
;
577 obj
.id
= EXOFS_SUPER_ID
;
578 exofs_make_credential(sbi
->s_cred
, &obj
);
580 ret
= exofs_read_kern(od
, sbi
->s_cred
, &obj
, 0, &fscb
, sizeof(fscb
));
584 sb
->s_magic
= le16_to_cpu(fscb
.s_magic
);
585 sbi
->s_nextid
= le64_to_cpu(fscb
.s_nextid
);
586 sbi
->s_numfiles
= le32_to_cpu(fscb
.s_numfiles
);
588 /* make sure what we read from the object store is correct */
589 if (sb
->s_magic
!= EXOFS_SUPER_MAGIC
) {
591 EXOFS_ERR("ERROR: Bad magic value\n");
595 if (le32_to_cpu(fscb
.s_version
) != EXOFS_FSCB_VER
) {
596 EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n",
597 EXOFS_FSCB_VER
, le32_to_cpu(fscb
.s_version
));
602 /* start generation numbers from a random point */
603 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
604 spin_lock_init(&sbi
->s_next_gen_lock
);
606 table_count
= le64_to_cpu(fscb
.s_dev_table_count
);
608 ret
= exofs_read_lookup_dev_table(&sbi
, table_count
);
613 /* set up operation vectors */
615 sb
->s_op
= &exofs_sops
;
616 sb
->s_export_op
= &exofs_export_ops
;
617 root
= exofs_iget(sb
, EXOFS_ROOT_ID
- EXOFS_OBJ_OFF
);
619 EXOFS_ERR("ERROR: exofs_iget failed\n");
623 sb
->s_root
= d_alloc_root(root
);
626 EXOFS_ERR("ERROR: get root inode failed\n");
631 if (!S_ISDIR(root
->i_mode
)) {
634 EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n",
640 _exofs_print_device("Mounting", opts
->dev_name
, sbi
->layout
.s_ods
[0],
645 EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
646 opts
->dev_name
, sbi
->layout
.s_pid
, ret
);
652 * Set up the superblock (calls exofs_fill_super eventually)
654 static int exofs_get_sb(struct file_system_type
*type
,
655 int flags
, const char *dev_name
,
656 void *data
, struct vfsmount
*mnt
)
658 struct exofs_mountopt opts
;
661 ret
= parse_options(data
, &opts
);
665 opts
.dev_name
= dev_name
;
666 return get_sb_nodev(type
, flags
, &opts
, exofs_fill_super
, mnt
);
670 * Return information about the file system state in the buffer. This is used
671 * by the 'df' command, for example.
673 static int exofs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
675 struct super_block
*sb
= dentry
->d_sb
;
676 struct exofs_sb_info
*sbi
= sb
->s_fs_info
;
677 struct exofs_io_state
*ios
;
678 struct osd_attr attrs
[] = {
679 ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS
,
680 OSD_ATTR_PQ_CAPACITY_QUOTA
, sizeof(__be64
)),
681 ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION
,
682 OSD_ATTR_PI_USED_CAPACITY
, sizeof(__be64
)),
684 uint64_t capacity
= ULLONG_MAX
;
685 uint64_t used
= ULLONG_MAX
;
686 uint8_t cred_a
[OSD_CAP_LEN
];
689 ret
= exofs_get_io_state(&sbi
->layout
, &ios
);
691 EXOFS_DBGMSG("exofs_get_io_state failed.\n");
695 exofs_make_credential(cred_a
, &ios
->obj
);
696 ios
->cred
= sbi
->s_cred
;
697 ios
->in_attr
= attrs
;
698 ios
->in_attr_len
= ARRAY_SIZE(attrs
);
700 ret
= exofs_sbi_read(ios
);
704 ret
= extract_attr_from_ios(ios
, &attrs
[0]);
706 capacity
= get_unaligned_be64(attrs
[0].val_ptr
);
707 if (unlikely(!capacity
))
708 capacity
= ULLONG_MAX
;
710 EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");
712 ret
= extract_attr_from_ios(ios
, &attrs
[1]);
714 used
= get_unaligned_be64(attrs
[1].val_ptr
);
716 EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n");
718 /* fill in the stats buffer */
719 buf
->f_type
= EXOFS_SUPER_MAGIC
;
720 buf
->f_bsize
= EXOFS_BLKSIZE
;
721 buf
->f_blocks
= capacity
>> 9;
722 buf
->f_bfree
= (capacity
- used
) >> 9;
723 buf
->f_bavail
= buf
->f_bfree
;
724 buf
->f_files
= sbi
->s_numfiles
;
725 buf
->f_ffree
= EXOFS_MAX_ID
- sbi
->s_numfiles
;
726 buf
->f_namelen
= EXOFS_NAME_LEN
;
729 exofs_put_io_state(ios
);
733 static const struct super_operations exofs_sops
= {
734 .alloc_inode
= exofs_alloc_inode
,
735 .destroy_inode
= exofs_destroy_inode
,
736 .write_inode
= exofs_write_inode
,
737 .delete_inode
= exofs_delete_inode
,
738 .put_super
= exofs_put_super
,
739 .write_super
= exofs_write_super
,
740 .sync_fs
= exofs_sync_fs
,
741 .statfs
= exofs_statfs
,
744 /******************************************************************************
746 *****************************************************************************/
748 struct dentry
*exofs_get_parent(struct dentry
*child
)
750 unsigned long ino
= exofs_parent_ino(child
);
755 return d_obtain_alias(exofs_iget(child
->d_inode
->i_sb
, ino
));
758 static struct inode
*exofs_nfs_get_inode(struct super_block
*sb
,
759 u64 ino
, u32 generation
)
763 inode
= exofs_iget(sb
, ino
);
765 return ERR_CAST(inode
);
766 if (generation
&& inode
->i_generation
!= generation
) {
767 /* we didn't find the right inode.. */
769 return ERR_PTR(-ESTALE
);
774 static struct dentry
*exofs_fh_to_dentry(struct super_block
*sb
,
775 struct fid
*fid
, int fh_len
, int fh_type
)
777 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
778 exofs_nfs_get_inode
);
781 static struct dentry
*exofs_fh_to_parent(struct super_block
*sb
,
782 struct fid
*fid
, int fh_len
, int fh_type
)
784 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
785 exofs_nfs_get_inode
);
788 static const struct export_operations exofs_export_ops
= {
789 .fh_to_dentry
= exofs_fh_to_dentry
,
790 .fh_to_parent
= exofs_fh_to_parent
,
791 .get_parent
= exofs_get_parent
,
794 /******************************************************************************
796 *****************************************************************************/
799 * struct that describes this file system
801 static struct file_system_type exofs_type
= {
802 .owner
= THIS_MODULE
,
804 .get_sb
= exofs_get_sb
,
805 .kill_sb
= generic_shutdown_super
,
808 static int __init
init_exofs(void)
812 err
= init_inodecache();
816 err
= register_filesystem(&exofs_type
);
822 destroy_inodecache();
827 static void __exit
exit_exofs(void)
829 unregister_filesystem(&exofs_type
);
830 destroy_inodecache();
833 MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>");
834 MODULE_DESCRIPTION("exofs");
835 MODULE_LICENSE("GPL");
837 module_init(init_exofs
)
838 module_exit(exit_exofs
)