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fs: block_dump missing dentry locking
[linux-block.git] / fs / nilfs2 / super.c
CommitLineData
783f6184
RK		 1/*
2 * super.c - NILFS module and super block management.
3 *
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Written by Ryusuke Konishi <ryusuke@osrg.net>
21 */
22/*
23 * linux/fs/ext2/super.c
24 *
25 * Copyright (C) 1992, 1993, 1994, 1995
26 * Remy Card (card@masi.ibp.fr)
27 * Laboratoire MASI - Institut Blaise Pascal
28 * Universite Pierre et Marie Curie (Paris VI)
29 *
30 * from
31 *
32 * linux/fs/minix/inode.c
33 *
34 * Copyright (C) 1991, 1992 Linus Torvalds
35 *
36 * Big-endian to little-endian byte-swapping/bitmaps by
37 * David S. Miller (davem@caip.rutgers.edu), 1995
38 */
39
40#include <linux/module.h>
41#include <linux/string.h>
42#include <linux/slab.h>
43#include <linux/init.h>
44#include <linux/blkdev.h>
45#include <linux/parser.h>
46#include <linux/random.h>
47#include <linux/crc32.h>
48#include <linux/smp_lock.h>
49#include <linux/vfs.h>
50#include <linux/writeback.h>
51#include <linux/kobject.h>
52#include <linux/exportfs.h>
53#include "nilfs.h"
54#include "mdt.h"
55#include "alloc.h"
56#include "page.h"
57#include "cpfile.h"
58#include "ifile.h"
59#include "dat.h"
60#include "segment.h"
61#include "segbuf.h"
62
63MODULE_AUTHOR("NTT Corp.");
64MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem "
65 "(NILFS)");
783f6184
RK		 66MODULE_LICENSE("GPL");
67
8c85e125 68static void nilfs_write_super(struct super_block *sb);
783f6184
RK		 69static int nilfs_remount(struct super_block *sb, int *flags, char *data);
70static int test_exclusive_mount(struct file_system_type *fs_type,
71 struct block_device *bdev, int flags);
72
73/**
74 * nilfs_error() - report failure condition on a filesystem
75 *
76 * nilfs_error() sets an ERROR_FS flag on the superblock as well as
77 * reporting an error message. It should be called when NILFS detects
78 * incoherences or defects of meta data on disk. As for sustainable
79 * errors such as a single-shot I/O error, nilfs_warning() or the printk()
80 * function should be used instead.
81 *
82 * The segment constructor must not call this function because it can
83 * kill itself.
84 */
85void nilfs_error(struct super_block *sb, const char *function,
86 const char *fmt, ...)
87{
88 struct nilfs_sb_info *sbi = NILFS_SB(sb);
89 va_list args;
90
91 va_start(args, fmt);
92 printk(KERN_CRIT "NILFS error (device %s): %s: ", sb->s_id, function);
93 vprintk(fmt, args);
94 printk("\n");
95 va_end(args);
96
97 if (!(sb->s_flags & MS_RDONLY)) {
98 struct the_nilfs *nilfs = sbi->s_nilfs;
99
100 if (!nilfs_test_opt(sbi, ERRORS_CONT))
101 nilfs_detach_segment_constructor(sbi);
102
103 down_write(&nilfs->ns_sem);
104 if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) {
105 nilfs->ns_mount_state |= NILFS_ERROR_FS;
e339ad31
RK		 106 nilfs->ns_sbp[0]->s_state |=
107 cpu_to_le16(NILFS_ERROR_FS);
108 nilfs_commit_super(sbi, 1);
783f6184
RK		 109 }
110 up_write(&nilfs->ns_sem);
111
112 if (nilfs_test_opt(sbi, ERRORS_RO)) {
113 printk(KERN_CRIT "Remounting filesystem read-only\n");
114 sb->s_flags |= MS_RDONLY;
115 }
116 }
117
118 if (nilfs_test_opt(sbi, ERRORS_PANIC))
119 panic("NILFS (device %s): panic forced after error\n",
120 sb->s_id);
121}
122
123void nilfs_warning(struct super_block *sb, const char *function,
124 const char *fmt, ...)
125{
126 va_list args;
127
128 va_start(args, fmt);
129 printk(KERN_WARNING "NILFS warning (device %s): %s: ",
130 sb->s_id, function);
131 vprintk(fmt, args);
132 printk("\n");
133 va_end(args);
134}
135
136static struct kmem_cache *nilfs_inode_cachep;
137
138struct inode *nilfs_alloc_inode(struct super_block *sb)
139{
140 struct nilfs_inode_info *ii;
141
142 ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS);
143 if (!ii)
144 return NULL;
145 ii->i_bh = NULL;
146 ii->i_state = 0;
147 ii->vfs_inode.i_version = 1;
148 nilfs_btnode_cache_init(&ii->i_btnode_cache);
149 return &ii->vfs_inode;
150}
151
152void nilfs_destroy_inode(struct inode *inode)
153{
154 kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode));
155}
156
157static void init_once(void *obj)
158{
159 struct nilfs_inode_info *ii = obj;
160
161 INIT_LIST_HEAD(&ii->i_dirty);
162#ifdef CONFIG_NILFS_XATTR
163 init_rwsem(&ii->xattr_sem);
164#endif
165 nilfs_btnode_cache_init_once(&ii->i_btnode_cache);
166 ii->i_bmap = (struct nilfs_bmap *)&ii->i_bmap_union;
167 inode_init_once(&ii->vfs_inode);
168}
169
170static int nilfs_init_inode_cache(void)
171{
172 nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache",
173 sizeof(struct nilfs_inode_info),
174 0, SLAB_RECLAIM_ACCOUNT,
175 init_once);
176
177 return (nilfs_inode_cachep == NULL) ? -ENOMEM : 0;
178}
179
180static inline void nilfs_destroy_inode_cache(void)
181{
182 kmem_cache_destroy(nilfs_inode_cachep);
183}
184
185static void nilfs_clear_inode(struct inode *inode)
186{
187 struct nilfs_inode_info *ii = NILFS_I(inode);
783f6184
RK		 188
189#ifdef CONFIG_NILFS_POSIX_ACL
190 if (ii->i_acl && ii->i_acl != NILFS_ACL_NOT_CACHED) {
191 posix_acl_release(ii->i_acl);
192 ii->i_acl = NILFS_ACL_NOT_CACHED;
193 }
194 if (ii->i_default_acl && ii->i_default_acl != NILFS_ACL_NOT_CACHED) {
195 posix_acl_release(ii->i_default_acl);
196 ii->i_default_acl = NILFS_ACL_NOT_CACHED;
197 }
198#endif
199 /*
200 * Free resources allocated in nilfs_read_inode(), here.
201 */
a2e7d2df 202 BUG_ON(!list_empty(&ii->i_dirty));
783f6184
RK		 203 brelse(ii->i_bh);
204 ii->i_bh = NULL;
783f6184
RK		 205
206 if (test_bit(NILFS_I_BMAP, &ii->i_state))
207 nilfs_bmap_clear(ii->i_bmap);
208
209 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
783f6184
RK		 210}
211
e339ad31 212static int nilfs_sync_super(struct nilfs_sb_info *sbi, int dupsb)
783f6184
RK		 213{
214 struct the_nilfs *nilfs = sbi->s_nilfs;
215 int err;
216 int barrier_done = 0;
217
218 if (nilfs_test_opt(sbi, BARRIER)) {
e339ad31 219 set_buffer_ordered(nilfs->ns_sbh[0]);
783f6184
RK		 220 barrier_done = 1;
221 }
222 retry:
e339ad31
RK		 223 set_buffer_dirty(nilfs->ns_sbh[0]);
224 err = sync_dirty_buffer(nilfs->ns_sbh[0]);
783f6184
RK		 225 if (err == -EOPNOTSUPP && barrier_done) {
226 nilfs_warning(sbi->s_super, __func__,
227 "barrier-based sync failed. "
228 "disabling barriers\n");
229 nilfs_clear_opt(sbi, BARRIER);
230 barrier_done = 0;
e339ad31 231 clear_buffer_ordered(nilfs->ns_sbh[0]);
783f6184
RK		 232 goto retry;
233 }
e339ad31 234 if (unlikely(err)) {
783f6184
RK		 235 printk(KERN_ERR
236 "NILFS: unable to write superblock (err=%d)\n", err);
e339ad31
RK		 237 if (err == -EIO && nilfs->ns_sbh[1]) {
238 nilfs_fall_back_super_block(nilfs);
239 goto retry;
240 }
241 } else {
242 struct nilfs_super_block *sbp = nilfs->ns_sbp[0];
243
244 /*
245 * The latest segment becomes trailable from the position
246 * written in superblock.
247 */
783f6184 248 clear_nilfs_discontinued(nilfs);
e339ad31
RK		 249
250 /* update GC protection for recent segments */
251 if (nilfs->ns_sbh[1]) {
252 sbp = NULL;
253 if (dupsb) {
254 set_buffer_dirty(nilfs->ns_sbh[1]);
255 if (!sync_dirty_buffer(nilfs->ns_sbh[1]))
256 sbp = nilfs->ns_sbp[1];
257 }
258 }
259 if (sbp) {
260 spin_lock(&nilfs->ns_last_segment_lock);
261 nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq);
262 spin_unlock(&nilfs->ns_last_segment_lock);
263 }
783f6184
RK		 264 }
265
266 return err;
267}
268
e339ad31 269int nilfs_commit_super(struct nilfs_sb_info *sbi, int dupsb)
783f6184
RK		 270{
271 struct the_nilfs *nilfs = sbi->s_nilfs;
e339ad31 272 struct nilfs_super_block **sbp = nilfs->ns_sbp;
783f6184 273 sector_t nfreeblocks;
e339ad31 274 time_t t;
783f6184
RK		 275 int err;
276
277 /* nilfs->sem must be locked by the caller. */
e339ad31
RK		 278 if (sbp[0]->s_magic != NILFS_SUPER_MAGIC) {
279 if (sbp[1] && sbp[1]->s_magic == NILFS_SUPER_MAGIC)
280 nilfs_swap_super_block(nilfs);
281 else {
282 printk(KERN_CRIT "NILFS: superblock broke on dev %s\n",
283 sbi->s_super->s_id);
284 return -EIO;
285 }
286 }
783f6184
RK		 287 err = nilfs_count_free_blocks(nilfs, &nfreeblocks);
288 if (unlikely(err)) {
289 printk(KERN_ERR "NILFS: failed to count free blocks\n");
290 return err;
291 }
e339ad31
RK		 292 spin_lock(&nilfs->ns_last_segment_lock);
293 sbp[0]->s_last_seq = cpu_to_le64(nilfs->ns_last_seq);
294 sbp[0]->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg);
295 sbp[0]->s_last_cno = cpu_to_le64(nilfs->ns_last_cno);
296 spin_unlock(&nilfs->ns_last_segment_lock);
297
298 t = get_seconds();
299 nilfs->ns_sbwtime[0] = t;
300 sbp[0]->s_free_blocks_count = cpu_to_le64(nfreeblocks);
301 sbp[0]->s_wtime = cpu_to_le64(t);
302 sbp[0]->s_sum = 0;
303 sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed,
304 (unsigned char *)sbp[0],
305 nilfs->ns_sbsize));
306 if (dupsb && sbp[1]) {
307 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
308 nilfs->ns_sbwtime[1] = t;
309 }
783f6184 310 sbi->s_super->s_dirt = 0;
e339ad31 311 return nilfs_sync_super(sbi, dupsb);
783f6184
RK		 312}
313
314static void nilfs_put_super(struct super_block *sb)
315{
316 struct nilfs_sb_info *sbi = NILFS_SB(sb);
317 struct the_nilfs *nilfs = sbi->s_nilfs;
318
6cfd0148
CH		 319 lock_kernel();
320
8c85e125
CH		 321 if (sb->s_dirt)
322 nilfs_write_super(sb);
323
783f6184
RK		 324 nilfs_detach_segment_constructor(sbi);
325
326 if (!(sb->s_flags & MS_RDONLY)) {
327 down_write(&nilfs->ns_sem);
e339ad31
RK		 328 nilfs->ns_sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state);
329 nilfs_commit_super(sbi, 1);
783f6184
RK		 330 up_write(&nilfs->ns_sem);
331 }
332
333 nilfs_detach_checkpoint(sbi);
334 put_nilfs(sbi->s_nilfs);
335 sbi->s_super = NULL;
336 sb->s_fs_info = NULL;
337 kfree(sbi);
6cfd0148
CH		 338
339 unlock_kernel();
783f6184
RK		 340}
341
342/**
343 * nilfs_write_super - write super block(s) of NILFS
344 * @sb: super_block
345 *
346 * nilfs_write_super() gets a fs-dependent lock, writes super block(s), and
347 * clears s_dirt. This function is called in the section protected by
348 * lock_super().
349 *
350 * The s_dirt flag is managed by each filesystem and we protect it by ns_sem
351 * of the struct the_nilfs. Lock order must be as follows:
352 *
353 * 1. lock_super()
354 * 2. down_write(&nilfs->ns_sem)
355 *
356 * Inside NILFS, locking ns_sem is enough to protect s_dirt and the buffer
e339ad31 357 * of the super block (nilfs->ns_sbp[]).
783f6184
RK		 358 *
359 * In most cases, VFS functions call lock_super() before calling these
360 * methods. So we must be careful not to bring on deadlocks when using
361 * lock_super(); see generic_shutdown_super(), write_super(), and so on.
362 *
363 * Note that order of lock_kernel() and lock_super() depends on contexts
364 * of VFS. We should also note that lock_kernel() can be used in its
365 * protective section and only the outermost one has an effect.
366 */
367static void nilfs_write_super(struct super_block *sb)
368{
369 struct nilfs_sb_info *sbi = NILFS_SB(sb);
370 struct the_nilfs *nilfs = sbi->s_nilfs;
371
372 down_write(&nilfs->ns_sem);
e339ad31
RK		 373 if (!(sb->s_flags & MS_RDONLY)) {
374 struct nilfs_super_block **sbp = nilfs->ns_sbp;
375 u64 t = get_seconds();
376 int dupsb;
377
378 if (!nilfs_discontinued(nilfs) && t >= nilfs->ns_sbwtime[0] &&
379 t < nilfs->ns_sbwtime[0] + NILFS_SB_FREQ) {
380 up_write(&nilfs->ns_sem);
381 return;
382 }
383 dupsb = sbp[1] && t > nilfs->ns_sbwtime[1] + NILFS_ALTSB_FREQ;
384 nilfs_commit_super(sbi, dupsb);
385 }
783f6184
RK		 386 sb->s_dirt = 0;
387 up_write(&nilfs->ns_sem);
388}
389
390static int nilfs_sync_fs(struct super_block *sb, int wait)
391{
392 int err = 0;
393
394 /* This function is called when super block should be written back */
395 if (wait)
396 err = nilfs_construct_segment(sb);
397 return err;
398}
399
400int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno)
401{
402 struct the_nilfs *nilfs = sbi->s_nilfs;
403 struct nilfs_checkpoint *raw_cp;
404 struct buffer_head *bh_cp;
405 int err;
406
407 down_write(&nilfs->ns_sem);
408 list_add(&sbi->s_list, &nilfs->ns_supers);
409 up_write(&nilfs->ns_sem);
410
411 sbi->s_ifile = nilfs_mdt_new(
412 nilfs, sbi->s_super, NILFS_IFILE_INO, NILFS_IFILE_GFP);
413 if (!sbi->s_ifile)
414 return -ENOMEM;
415
416 err = nilfs_palloc_init_blockgroup(sbi->s_ifile, nilfs->ns_inode_size);
417 if (unlikely(err))
418 goto failed;
419
420 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp,
421 &bh_cp);
422 if (unlikely(err)) {
423 if (err == -ENOENT || err == -EINVAL) {
424 printk(KERN_ERR
425 "NILFS: Invalid checkpoint "
426 "(checkpoint number=%llu)\n",
427 (unsigned long long)cno);
428 err = -EINVAL;
429 }
430 goto failed;
431 }
432 err = nilfs_read_inode_common(sbi->s_ifile, &raw_cp->cp_ifile_inode);
433 if (unlikely(err))
434 goto failed_bh;
435 atomic_set(&sbi->s_inodes_count, le64_to_cpu(raw_cp->cp_inodes_count));
436 atomic_set(&sbi->s_blocks_count, le64_to_cpu(raw_cp->cp_blocks_count));
437
438 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
439 return 0;
440
441 failed_bh:
442 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
443 failed:
444 nilfs_mdt_destroy(sbi->s_ifile);
445 sbi->s_ifile = NULL;
446
447 down_write(&nilfs->ns_sem);
448 list_del_init(&sbi->s_list);
449 up_write(&nilfs->ns_sem);
450
451 return err;
452}
453
454void nilfs_detach_checkpoint(struct nilfs_sb_info *sbi)
455{
456 struct the_nilfs *nilfs = sbi->s_nilfs;
457
458 nilfs_mdt_clear(sbi->s_ifile);
459 nilfs_mdt_destroy(sbi->s_ifile);
460 sbi->s_ifile = NULL;
461 down_write(&nilfs->ns_sem);
462 list_del_init(&sbi->s_list);
463 up_write(&nilfs->ns_sem);
464}
465
466static int nilfs_mark_recovery_complete(struct nilfs_sb_info *sbi)
467{
468 struct the_nilfs *nilfs = sbi->s_nilfs;
469 int err = 0;
470
471 down_write(&nilfs->ns_sem);
472 if (!(nilfs->ns_mount_state & NILFS_VALID_FS)) {
473 nilfs->ns_mount_state |= NILFS_VALID_FS;
e339ad31 474 err = nilfs_commit_super(sbi, 1);
783f6184
RK		 475 if (likely(!err))
476 printk(KERN_INFO "NILFS: recovery complete.\n");
477 }
478 up_write(&nilfs->ns_sem);
479 return err;
480}
481
482static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
483{
484 struct super_block *sb = dentry->d_sb;
485 struct nilfs_sb_info *sbi = NILFS_SB(sb);
c306af23
RK		 486 struct the_nilfs *nilfs = sbi->s_nilfs;
487 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
783f6184
RK		 488 unsigned long long blocks;
489 unsigned long overhead;
490 unsigned long nrsvblocks;
491 sector_t nfreeblocks;
783f6184
RK		 492 int err;
493
494 /*
495 * Compute all of the segment blocks
496 *
497 * The blocks before first segment and after last segment
498 * are excluded.
499 */
500 blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments
501 - nilfs->ns_first_data_block;
502 nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment;
503
504 /*
505 * Compute the overhead
506 *
507 * When distributing meta data blocks outside semgent structure,
508 * We must count them as the overhead.
509 */
510 overhead = 0;
511
512 err = nilfs_count_free_blocks(nilfs, &nfreeblocks);
513 if (unlikely(err))
514 return err;
515
516 buf->f_type = NILFS_SUPER_MAGIC;
517 buf->f_bsize = sb->s_blocksize;
518 buf->f_blocks = blocks - overhead;
519 buf->f_bfree = nfreeblocks;
520 buf->f_bavail = (buf->f_bfree >= nrsvblocks) ?
521 (buf->f_bfree - nrsvblocks) : 0;
522 buf->f_files = atomic_read(&sbi->s_inodes_count);
523 buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */
524 buf->f_namelen = NILFS_NAME_LEN;
c306af23
RK		 525 buf->f_fsid.val[0] = (u32)id;
526 buf->f_fsid.val[1] = (u32)(id >> 32);
527
783f6184
RK		 528 return 0;
529}
530
531static struct super_operations nilfs_sops = {
532 .alloc_inode = nilfs_alloc_inode,
533 .destroy_inode = nilfs_destroy_inode,
534 .dirty_inode = nilfs_dirty_inode,
535 /* .write_inode = nilfs_write_inode, */
536 /* .put_inode = nilfs_put_inode, */
537 /* .drop_inode = nilfs_drop_inode, */
538 .delete_inode = nilfs_delete_inode,
539 .put_super = nilfs_put_super,
540 .write_super = nilfs_write_super,
541 .sync_fs = nilfs_sync_fs,
542 /* .write_super_lockfs */
543 /* .unlockfs */
544 .statfs = nilfs_statfs,
545 .remount_fs = nilfs_remount,
546 .clear_inode = nilfs_clear_inode,
547 /* .umount_begin */
548 /* .show_options */
549};
550
551static struct inode *
552nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation)
553{
554 struct inode *inode;
555
556 if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO &&
557 ino != NILFS_SKETCH_INO)
558 return ERR_PTR(-ESTALE);
559
560 inode = nilfs_iget(sb, ino);
561 if (IS_ERR(inode))
562 return ERR_CAST(inode);
563 if (generation && inode->i_generation != generation) {
564 iput(inode);
565 return ERR_PTR(-ESTALE);
566 }
567
568 return inode;
569}
570
571static struct dentry *
572nilfs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len,
573 int fh_type)
574{
575 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
576 nilfs_nfs_get_inode);
577}
578
579static struct dentry *
580nilfs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len,
581 int fh_type)
582{
583 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
584 nilfs_nfs_get_inode);
585}
586
587static struct export_operations nilfs_export_ops = {
588 .fh_to_dentry = nilfs_fh_to_dentry,
589 .fh_to_parent = nilfs_fh_to_parent,
590 .get_parent = nilfs_get_parent,
591};
592
593enum {
594 Opt_err_cont, Opt_err_panic, Opt_err_ro,
595 Opt_barrier, Opt_snapshot, Opt_order,
596 Opt_err,
597};
598
599static match_table_t tokens = {
600 {Opt_err_cont, "errors=continue"},
601 {Opt_err_panic, "errors=panic"},
602 {Opt_err_ro, "errors=remount-ro"},
603 {Opt_barrier, "barrier=%s"},
604 {Opt_snapshot, "cp=%u"},
605 {Opt_order, "order=%s"},
606 {Opt_err, NULL}
607};
608
609static int match_bool(substring_t *s, int *result)
610{
611 int len = s->to - s->from;
612
613 if (strncmp(s->from, "on", len) == 0)
614 *result = 1;
615 else if (strncmp(s->from, "off", len) == 0)
616 *result = 0;
617 else
618 return 1;
619 return 0;
620}
621
622static int parse_options(char *options, struct super_block *sb)
623{
624 struct nilfs_sb_info *sbi = NILFS_SB(sb);
625 char *p;
626 substring_t args[MAX_OPT_ARGS];
627 int option;
628
629 if (!options)
630 return 1;
631
632 while ((p = strsep(&options, ",")) != NULL) {
633 int token;
634 if (!*p)
635 continue;
636
637 token = match_token(p, tokens, args);
638 switch (token) {
639 case Opt_barrier:
640 if (match_bool(&args[0], &option))
641 return 0;
642 if (option)
643 nilfs_set_opt(sbi, BARRIER);
644 else
645 nilfs_clear_opt(sbi, BARRIER);
646 break;
647 case Opt_order:
648 if (strcmp(args[0].from, "relaxed") == 0)
649 /* Ordered data semantics */
650 nilfs_clear_opt(sbi, STRICT_ORDER);
651 else if (strcmp(args[0].from, "strict") == 0)
652 /* Strict in-order semantics */
653 nilfs_set_opt(sbi, STRICT_ORDER);
654 else
655 return 0;
656 break;
657 case Opt_err_panic:
658 nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC);
659 break;
660 case Opt_err_ro:
661 nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO);
662 break;
663 case Opt_err_cont:
664 nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT);
665 break;
666 case Opt_snapshot:
667 if (match_int(&args[0], &option) || option <= 0)
668 return 0;
669 if (!(sb->s_flags & MS_RDONLY))
670 return 0;
671 sbi->s_snapshot_cno = option;
672 nilfs_set_opt(sbi, SNAPSHOT);
673 break;
674 default:
675 printk(KERN_ERR
676 "NILFS: Unrecognized mount option \"%s\"\n", p);
677 return 0;
678 }
679 }
680 return 1;
681}
682
683static inline void
684nilfs_set_default_options(struct nilfs_sb_info *sbi,
685 struct nilfs_super_block *sbp)
686{
687 sbi->s_mount_opt =
688 NILFS_MOUNT_ERRORS_CONT | NILFS_MOUNT_BARRIER;
689}
690
691static int nilfs_setup_super(struct nilfs_sb_info *sbi)
692{
693 struct the_nilfs *nilfs = sbi->s_nilfs;
e339ad31 694 struct nilfs_super_block *sbp = nilfs->ns_sbp[0];
783f6184
RK		 695 int max_mnt_count = le16_to_cpu(sbp->s_max_mnt_count);
696 int mnt_count = le16_to_cpu(sbp->s_mnt_count);
697
698 /* nilfs->sem must be locked by the caller. */
699 if (!(nilfs->ns_mount_state & NILFS_VALID_FS)) {
700 printk(KERN_WARNING "NILFS warning: mounting unchecked fs\n");
701 } else if (nilfs->ns_mount_state & NILFS_ERROR_FS) {
702 printk(KERN_WARNING
703 "NILFS warning: mounting fs with errors\n");
704#if 0
705 } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) {
706 printk(KERN_WARNING
707 "NILFS warning: maximal mount count reached\n");
708#endif
709 }
710 if (!max_mnt_count)
711 sbp->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT);
712
713 sbp->s_mnt_count = cpu_to_le16(mnt_count + 1);
714 sbp->s_state = cpu_to_le16(le16_to_cpu(sbp->s_state) & ~NILFS_VALID_FS);
715 sbp->s_mtime = cpu_to_le64(get_seconds());
e339ad31 716 return nilfs_commit_super(sbi, 1);
783f6184
RK		 717}
718
e339ad31
RK		 719struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb,
720 u64 pos, int blocksize,
721 struct buffer_head **pbh)
783f6184 722{
e339ad31
RK		 723 unsigned long long sb_index = pos;
724 unsigned long offset;
783f6184 725
e339ad31 726 offset = do_div(sb_index, blocksize);
783f6184 727 *pbh = sb_bread(sb, sb_index);
e339ad31 728 if (!*pbh)
783f6184 729 return NULL;
783f6184
RK		 730 return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset);
731}
732
783f6184
RK		 733int nilfs_store_magic_and_option(struct super_block *sb,
734 struct nilfs_super_block *sbp,
735 char *data)
736{
737 struct nilfs_sb_info *sbi = NILFS_SB(sb);
738
783f6184
RK		 739 sb->s_magic = le16_to_cpu(sbp->s_magic);
740
741 /* FS independent flags */
742#ifdef NILFS_ATIME_DISABLE
743 sb->s_flags |= MS_NOATIME;
744#endif
745
783f6184
RK		 746 nilfs_set_default_options(sbi, sbp);
747
748 sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid);
749 sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid);
750 sbi->s_interval = le32_to_cpu(sbp->s_c_interval);
751 sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max);
752
e339ad31 753 return !parse_options(data, sb) ? -EINVAL : 0 ;
783f6184
RK		 754}
755
756/**
757 * nilfs_fill_super() - initialize a super block instance
758 * @sb: super_block
759 * @data: mount options
760 * @silent: silent mode flag
761 * @nilfs: the_nilfs struct
762 *
763 * This function is called exclusively by bd_mount_mutex.
764 * So, the recovery process is protected from other simultaneous mounts.
765 */
766static int
767nilfs_fill_super(struct super_block *sb, void *data, int silent,
768 struct the_nilfs *nilfs)
769{
770 struct nilfs_sb_info *sbi;
771 struct inode *root;
772 __u64 cno;
773 int err;
774
775 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
776 if (!sbi)
777 return -ENOMEM;
778
779 sb->s_fs_info = sbi;
780
781 get_nilfs(nilfs);
782 sbi->s_nilfs = nilfs;
783 sbi->s_super = sb;
784
785 err = init_nilfs(nilfs, sbi, (char *)data);
786 if (err)
787 goto failed_sbi;
788
789 spin_lock_init(&sbi->s_inode_lock);
790 INIT_LIST_HEAD(&sbi->s_dirty_files);
791 INIT_LIST_HEAD(&sbi->s_list);
792
793 /*
794 * Following initialization is overlapped because
795 * nilfs_sb_info structure has been cleared at the beginning.
796 * But we reserve them to keep our interest and make ready
797 * for the future change.
798 */
799 get_random_bytes(&sbi->s_next_generation,
800 sizeof(sbi->s_next_generation));
801 spin_lock_init(&sbi->s_next_gen_lock);
802
803 sb->s_op = &nilfs_sops;
804 sb->s_export_op = &nilfs_export_ops;
805 sb->s_root = NULL;
61239230 806 sb->s_time_gran = 1;
783f6184
RK		 807
808 if (!nilfs_loaded(nilfs)) {
809 err = load_nilfs(nilfs, sbi);
810 if (err)
811 goto failed_sbi;
812 }
813 cno = nilfs_last_cno(nilfs);
814
815 if (sb->s_flags & MS_RDONLY) {
816 if (nilfs_test_opt(sbi, SNAPSHOT)) {
1f5abe7e
RK		 817 err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile,
818 sbi->s_snapshot_cno);
819 if (err < 0)
820 goto failed_sbi;
821 if (!err) {
783f6184
RK		 822 printk(KERN_ERR
823 "NILFS: The specified checkpoint is "
824 "not a snapshot "
825 "(checkpoint number=%llu).\n",
826 (unsigned long long)sbi->s_snapshot_cno);
827 err = -EINVAL;
828 goto failed_sbi;
829 }
830 cno = sbi->s_snapshot_cno;
831 } else
832 /* Read-only mount */
833 sbi->s_snapshot_cno = cno;
834 }
835
836 err = nilfs_attach_checkpoint(sbi, cno);
837 if (err) {
838 printk(KERN_ERR "NILFS: error loading a checkpoint"
839 " (checkpoint number=%llu).\n", (unsigned long long)cno);
840 goto failed_sbi;
841 }
842
843 if (!(sb->s_flags & MS_RDONLY)) {
cece5520 844 err = nilfs_attach_segment_constructor(sbi);
783f6184
RK		 845 if (err)
846 goto failed_checkpoint;
847 }
848
849 root = nilfs_iget(sb, NILFS_ROOT_INO);
850 if (IS_ERR(root)) {
851 printk(KERN_ERR "NILFS: get root inode failed\n");
852 err = PTR_ERR(root);
853 goto failed_segctor;
854 }
855 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
856 iput(root);
857 printk(KERN_ERR "NILFS: corrupt root inode.\n");
858 err = -EINVAL;
859 goto failed_segctor;
860 }
861 sb->s_root = d_alloc_root(root);
862 if (!sb->s_root) {
863 iput(root);
864 printk(KERN_ERR "NILFS: get root dentry failed\n");
865 err = -ENOMEM;
866 goto failed_segctor;
867 }
868
869 if (!(sb->s_flags & MS_RDONLY)) {
870 down_write(&nilfs->ns_sem);
871 nilfs_setup_super(sbi);
872 up_write(&nilfs->ns_sem);
873 }
874
875 err = nilfs_mark_recovery_complete(sbi);
876 if (unlikely(err)) {
877 printk(KERN_ERR "NILFS: recovery failed.\n");
878 goto failed_root;
879 }
880
881 return 0;
882
883 failed_root:
884 dput(sb->s_root);
885 sb->s_root = NULL;
886
887 failed_segctor:
888 nilfs_detach_segment_constructor(sbi);
889
890 failed_checkpoint:
891 nilfs_detach_checkpoint(sbi);
892
893 failed_sbi:
894 put_nilfs(nilfs);
895 sb->s_fs_info = NULL;
896 kfree(sbi);
897 return err;
898}
899
900static int nilfs_remount(struct super_block *sb, int *flags, char *data)
901{
902 struct nilfs_sb_info *sbi = NILFS_SB(sb);
903 struct nilfs_super_block *sbp;
904 struct the_nilfs *nilfs = sbi->s_nilfs;
905 unsigned long old_sb_flags;
906 struct nilfs_mount_options old_opts;
907 int err;
908
909 old_sb_flags = sb->s_flags;
910 old_opts.mount_opt = sbi->s_mount_opt;
911 old_opts.snapshot_cno = sbi->s_snapshot_cno;
912
913 if (!parse_options(data, sb)) {
914 err = -EINVAL;
915 goto restore_opts;
916 }
917 sb->s_flags = (sb->s_flags & ~MS_POSIXACL);
918
919 if ((*flags & MS_RDONLY) &&
920 sbi->s_snapshot_cno != old_opts.snapshot_cno) {
921 printk(KERN_WARNING "NILFS (device %s): couldn't "
922 "remount to a different snapshot. \n",
923 sb->s_id);
924 err = -EINVAL;
925 goto restore_opts;
926 }
927
928 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
929 goto out;
930 if (*flags & MS_RDONLY) {
931 /* Shutting down the segment constructor */
932 nilfs_detach_segment_constructor(sbi);
933 sb->s_flags |= MS_RDONLY;
934
935 sbi->s_snapshot_cno = nilfs_last_cno(nilfs);
936 /* nilfs_set_opt(sbi, SNAPSHOT); */
937
938 /*
939 * Remounting a valid RW partition RDONLY, so set
940 * the RDONLY flag and then mark the partition as valid again.
941 */
942 down_write(&nilfs->ns_sem);
e339ad31 943 sbp = nilfs->ns_sbp[0];
783f6184
RK		 944 if (!(sbp->s_state & le16_to_cpu(NILFS_VALID_FS)) &&
945 (nilfs->ns_mount_state & NILFS_VALID_FS))
946 sbp->s_state = cpu_to_le16(nilfs->ns_mount_state);
947 sbp->s_mtime = cpu_to_le64(get_seconds());
e339ad31 948 nilfs_commit_super(sbi, 1);
783f6184
RK		 949 up_write(&nilfs->ns_sem);
950 } else {
951 /*
952 * Mounting a RDONLY partition read-write, so reread and
953 * store the current valid flag. (It may have been changed
954 * by fsck since we originally mounted the partition.)
955 */
956 down(&sb->s_bdev->bd_mount_sem);
957 /* Check existing RW-mount */
958 if (test_exclusive_mount(sb->s_type, sb->s_bdev, 0)) {
959 printk(KERN_WARNING "NILFS (device %s): couldn't "
960 "remount because a RW-mount exists.\n",
961 sb->s_id);
962 err = -EBUSY;
963 goto rw_remount_failed;
964 }
965 if (sbi->s_snapshot_cno != nilfs_last_cno(nilfs)) {
966 printk(KERN_WARNING "NILFS (device %s): couldn't "
967 "remount because the current RO-mount is not "
968 "the latest one.\n",
969 sb->s_id);
970 err = -EINVAL;
971 goto rw_remount_failed;
972 }
973 sb->s_flags &= ~MS_RDONLY;
974 nilfs_clear_opt(sbi, SNAPSHOT);
975 sbi->s_snapshot_cno = 0;
976
cece5520 977 err = nilfs_attach_segment_constructor(sbi);
783f6184
RK		 978 if (err)
979 goto rw_remount_failed;
980
981 down_write(&nilfs->ns_sem);
982 nilfs_setup_super(sbi);
983 up_write(&nilfs->ns_sem);
984
985 up(&sb->s_bdev->bd_mount_sem);
986 }
987 out:
988 return 0;
989
990 rw_remount_failed:
991 up(&sb->s_bdev->bd_mount_sem);
992 restore_opts:
993 sb->s_flags = old_sb_flags;
994 sbi->s_mount_opt = old_opts.mount_opt;
995 sbi->s_snapshot_cno = old_opts.snapshot_cno;
996 return err;
997}
998
999struct nilfs_super_data {
1000 struct block_device *bdev;
1001 __u64 cno;
1002 int flags;
1003};
1004
1005/**
1006 * nilfs_identify - pre-read mount options needed to identify mount instance
1007 * @data: mount options
1008 * @sd: nilfs_super_data
1009 */
1010static int nilfs_identify(char *data, struct nilfs_super_data *sd)
1011{
1012 char *p, *options = data;
1013 substring_t args[MAX_OPT_ARGS];
1014 int option, token;
1015 int ret = 0;
1016
1017 do {
1018 p = strsep(&options, ",");
1019 if (p != NULL && *p) {
1020 token = match_token(p, tokens, args);
1021 if (token == Opt_snapshot) {
1022 if (!(sd->flags & MS_RDONLY))
1023 ret++;
1024 else {
1025 ret = match_int(&args[0], &option);
1026 if (!ret) {
1027 if (option > 0)
1028 sd->cno = option;
1029 else
1030 ret++;
1031 }
1032 }
1033 }
1034 if (ret)
1035 printk(KERN_ERR
1036 "NILFS: invalid mount option: %s\n", p);
1037 }
1038 if (!options)
1039 break;
1040 BUG_ON(options == data);
1041 *(options - 1) = ',';
1042 } while (!ret);
1043 return ret;
1044}
1045
1046static int nilfs_set_bdev_super(struct super_block *s, void *data)
1047{
1048 struct nilfs_super_data *sd = data;
1049
1050 s->s_bdev = sd->bdev;
1051 s->s_dev = s->s_bdev->bd_dev;
1052 return 0;
1053}
1054
1055static int nilfs_test_bdev_super(struct super_block *s, void *data)
1056{
1057 struct nilfs_super_data *sd = data;
1058
1059 return s->s_bdev == sd->bdev;
1060}
1061
1062static int nilfs_test_bdev_super2(struct super_block *s, void *data)
1063{
1064 struct nilfs_super_data *sd = data;
1065 int ret;
1066
1067 if (s->s_bdev != sd->bdev)
1068 return 0;
1069
1070 if (!((s->s_flags | sd->flags) & MS_RDONLY))
1071 return 1; /* Reuse an old R/W-mode super_block */
1072
1073 if (s->s_flags & sd->flags & MS_RDONLY) {
1074 if (down_read_trylock(&s->s_umount)) {
1075 ret = s->s_root &&
1076 (sd->cno == NILFS_SB(s)->s_snapshot_cno);
1077 up_read(&s->s_umount);
1078 /*
1079 * This path is locked with sb_lock by sget().
1080 * So, drop_super() causes deadlock.
1081 */
1082 return ret;
1083 }
1084 }
1085 return 0;
1086}
1087
1088static int
1089nilfs_get_sb(struct file_system_type *fs_type, int flags,
1090 const char *dev_name, void *data, struct vfsmount *mnt)
1091{
1092 struct nilfs_super_data sd;
1093 struct super_block *s, *s2;
1094 struct the_nilfs *nilfs = NULL;
1095 int err, need_to_close = 1;
1096
1097 sd.bdev = open_bdev_exclusive(dev_name, flags, fs_type);
1098 if (IS_ERR(sd.bdev))
1099 return PTR_ERR(sd.bdev);
1100
1101 /*
1102 * To get mount instance using sget() vfs-routine, NILFS needs
1103 * much more information than normal filesystems to identify mount
1104 * instance. For snapshot mounts, not only a mount type (ro-mount
1105 * or rw-mount) but also a checkpoint number is required.
1106 * The results are passed in sget() using nilfs_super_data.
1107 */
1108 sd.cno = 0;
1109 sd.flags = flags;
1110 if (nilfs_identify((char *)data, &sd)) {
1111 err = -EINVAL;
1112 goto failed;
1113 }
1114
1115 /*
1116 * once the super is inserted into the list by sget, s_umount
1117 * will protect the lockfs code from trying to start a snapshot
1118 * while we are mounting
1119 */
1120 down(&sd.bdev->bd_mount_sem);
1121 if (!sd.cno &&
1122 (err = test_exclusive_mount(fs_type, sd.bdev, flags ^ MS_RDONLY))) {
1123 err = (err < 0) ? : -EBUSY;
1124 goto failed_unlock;
1125 }
1126
1127 /*
1128 * Phase-1: search any existent instance and get the_nilfs
1129 */
1130 s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, &sd);
1131 if (IS_ERR(s))
1132 goto error_s;
1133
1134 if (!s->s_root) {
1135 err = -ENOMEM;
1136 nilfs = alloc_nilfs(sd.bdev);
1137 if (!nilfs)
1138 goto cancel_new;
1139 } else {
1140 struct nilfs_sb_info *sbi = NILFS_SB(s);
1141
783f6184
RK		 1142 /*
1143 * s_umount protects super_block from unmount process;
1144 * It covers pointers of nilfs_sb_info and the_nilfs.
1145 */
1146 nilfs = sbi->s_nilfs;
1147 get_nilfs(nilfs);
1148 up_write(&s->s_umount);
1149
1150 /*
1151 * Phase-2: search specified snapshot or R/W mode super_block
1152 */
1153 if (!sd.cno)
1154 /* trying to get the latest checkpoint. */
1155 sd.cno = nilfs_last_cno(nilfs);
1156
1157 s2 = sget(fs_type, nilfs_test_bdev_super2,
1158 nilfs_set_bdev_super, &sd);
1159 deactivate_super(s);
1160 /*
1161 * Although deactivate_super() invokes close_bdev_exclusive() at
1162 * kill_block_super(). Here, s is an existent mount; we need
1163 * one more close_bdev_exclusive() call.
1164 */
1165 s = s2;
1166 if (IS_ERR(s))
1167 goto error_s;
1168 }
1169
1170 if (!s->s_root) {
1171 char b[BDEVNAME_SIZE];
1172
1173 s->s_flags = flags;
1174 strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id));
1175 sb_set_blocksize(s, block_size(sd.bdev));
1176
1177 err = nilfs_fill_super(s, data, flags & MS_VERBOSE, nilfs);
1178 if (err)
1179 goto cancel_new;
1180
1181 s->s_flags |= MS_ACTIVE;
1182 need_to_close = 0;
1183 } else if (!(s->s_flags & MS_RDONLY)) {
1184 err = -EBUSY;
1185 }
1186
1187 up(&sd.bdev->bd_mount_sem);
1188 put_nilfs(nilfs);
1189 if (need_to_close)
1190 close_bdev_exclusive(sd.bdev, flags);
1191 simple_set_mnt(mnt, s);
1192 return 0;
1193
1194 error_s:
1195 up(&sd.bdev->bd_mount_sem);
1196 if (nilfs)
1197 put_nilfs(nilfs);
1198 close_bdev_exclusive(sd.bdev, flags);
1199 return PTR_ERR(s);
1200
1201 failed_unlock:
1202 up(&sd.bdev->bd_mount_sem);
1203 failed:
1204 close_bdev_exclusive(sd.bdev, flags);
1205
1206 return err;
1207
1208 cancel_new:
1209 /* Abandoning the newly allocated superblock */
1210 up(&sd.bdev->bd_mount_sem);
1211 if (nilfs)
1212 put_nilfs(nilfs);
1213 up_write(&s->s_umount);
1214 deactivate_super(s);
1215 /*
1216 * deactivate_super() invokes close_bdev_exclusive().
1217 * We must finish all post-cleaning before this call;
1218 * put_nilfs() and unlocking bd_mount_sem need the block device.
1219 */
1220 return err;
1221}
1222
1223static int nilfs_test_bdev_super3(struct super_block *s, void *data)
1224{
1225 struct nilfs_super_data *sd = data;
1226 int ret;
1227
1228 if (s->s_bdev != sd->bdev)
1229 return 0;
1230 if (down_read_trylock(&s->s_umount)) {
1231 ret = (s->s_flags & MS_RDONLY) && s->s_root &&
1232 nilfs_test_opt(NILFS_SB(s), SNAPSHOT);
1233 up_read(&s->s_umount);
1234 if (ret)
1235 return 0; /* ignore snapshot mounts */
1236 }
1237 return !((sd->flags ^ s->s_flags) & MS_RDONLY);
1238}
1239
1240static int __false_bdev_super(struct super_block *s, void *data)
1241{
1242#if 0 /* XXX: workaround for lock debug. This is not good idea */
1243 up_write(&s->s_umount);
1244#endif
1245 return -EFAULT;
1246}
1247
1248/**
1249 * test_exclusive_mount - check whether an exclusive RW/RO mount exists or not.
1250 * fs_type: filesystem type
1251 * bdev: block device
1252 * flag: 0 (check rw-mount) or MS_RDONLY (check ro-mount)
1253 * res: pointer to an integer to store result
1254 *
1255 * This function must be called within a section protected by bd_mount_mutex.
1256 */
1257static int test_exclusive_mount(struct file_system_type *fs_type,
1258 struct block_device *bdev, int flags)
1259{
1260 struct super_block *s;
1261 struct nilfs_super_data sd = { .flags = flags, .bdev = bdev };
1262
1263 s = sget(fs_type, nilfs_test_bdev_super3, __false_bdev_super, &sd);
1264 if (IS_ERR(s)) {
1265 if (PTR_ERR(s) != -EFAULT)
1266 return PTR_ERR(s);
1267 return 0; /* Not found */
1268 }
1269 up_write(&s->s_umount);
1270 deactivate_super(s);
1271 return 1; /* Found */
1272}
1273
1274struct file_system_type nilfs_fs_type = {
1275 .owner = THIS_MODULE,
1276 .name = "nilfs2",
1277 .get_sb = nilfs_get_sb,
1278 .kill_sb = kill_block_super,
1279 .fs_flags = FS_REQUIRES_DEV,
1280};
1281
1282static int __init init_nilfs_fs(void)
1283{
1284 int err;
1285
1286 err = nilfs_init_inode_cache();
1287 if (err)
1288 goto failed;
1289
1290 err = nilfs_init_transaction_cache();
1291 if (err)
1292 goto failed_inode_cache;
1293
1294 err = nilfs_init_segbuf_cache();
1295 if (err)
1296 goto failed_transaction_cache;
1297
1298 err = nilfs_btree_path_cache_init();
1299 if (err)
1300 goto failed_segbuf_cache;
1301
1302 err = register_filesystem(&nilfs_fs_type);
1303 if (err)
1304 goto failed_btree_path_cache;
1305
1306 return 0;
1307
1308 failed_btree_path_cache:
1309 nilfs_btree_path_cache_destroy();
1310
1311 failed_segbuf_cache:
1312 nilfs_destroy_segbuf_cache();
1313
1314 failed_transaction_cache:
1315 nilfs_destroy_transaction_cache();
1316
1317 failed_inode_cache:
1318 nilfs_destroy_inode_cache();
1319
1320 failed:
1321 return err;
1322}
1323
1324static void __exit exit_nilfs_fs(void)
1325{
1326 nilfs_destroy_segbuf_cache();
1327 nilfs_destroy_transaction_cache();
1328 nilfs_destroy_inode_cache();
1329 nilfs_btree_path_cache_destroy();
1330 unregister_filesystem(&nilfs_fs_type);
1331}
1332
1333module_init(init_nilfs_fs)
1334module_exit(exit_nilfs_fs)
Linux 6.x block layer and io_uring tree(s)