nilfs2: use iget for all metadata files
[linux-2.6-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>
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48#include <linux/vfs.h>
49#include <linux/writeback.h>
50#include <linux/kobject.h>
b58a285b
JS
51#include <linux/seq_file.h>
52#include <linux/mount.h>
783f6184 53#include "nilfs.h"
8e656fd5 54#include "export.h"
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55#include "mdt.h"
56#include "alloc.h"
05d0e94b
RK
57#include "btree.h"
58#include "btnode.h"
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59#include "page.h"
60#include "cpfile.h"
61#include "ifile.h"
62#include "dat.h"
63#include "segment.h"
64#include "segbuf.h"
65
66MODULE_AUTHOR("NTT Corp.");
67MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem "
68 "(NILFS)");
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69MODULE_LICENSE("GPL");
70
41c88bd7
LH
71struct kmem_cache *nilfs_inode_cachep;
72struct kmem_cache *nilfs_transaction_cachep;
73struct kmem_cache *nilfs_segbuf_cachep;
74struct kmem_cache *nilfs_btree_path_cache;
75
783f6184 76static int nilfs_remount(struct super_block *sb, int *flags, char *data);
783f6184 77
c8a11c8a
RK
78static void nilfs_set_error(struct nilfs_sb_info *sbi)
79{
80 struct the_nilfs *nilfs = sbi->s_nilfs;
d26493b6 81 struct nilfs_super_block **sbp;
c8a11c8a
RK
82
83 down_write(&nilfs->ns_sem);
84 if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) {
85 nilfs->ns_mount_state |= NILFS_ERROR_FS;
b2ac86e1 86 sbp = nilfs_prepare_super(sbi, 0);
d26493b6
JS
87 if (likely(sbp)) {
88 sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS);
b2ac86e1
JS
89 if (sbp[1])
90 sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS);
91 nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL);
d26493b6 92 }
c8a11c8a
RK
93 }
94 up_write(&nilfs->ns_sem);
95}
96
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97/**
98 * nilfs_error() - report failure condition on a filesystem
99 *
100 * nilfs_error() sets an ERROR_FS flag on the superblock as well as
101 * reporting an error message. It should be called when NILFS detects
102 * incoherences or defects of meta data on disk. As for sustainable
103 * errors such as a single-shot I/O error, nilfs_warning() or the printk()
104 * function should be used instead.
105 *
106 * The segment constructor must not call this function because it can
107 * kill itself.
108 */
109void nilfs_error(struct super_block *sb, const char *function,
110 const char *fmt, ...)
111{
112 struct nilfs_sb_info *sbi = NILFS_SB(sb);
113 va_list args;
114
115 va_start(args, fmt);
116 printk(KERN_CRIT "NILFS error (device %s): %s: ", sb->s_id, function);
117 vprintk(fmt, args);
118 printk("\n");
119 va_end(args);
120
121 if (!(sb->s_flags & MS_RDONLY)) {
c8a11c8a 122 nilfs_set_error(sbi);
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123
124 if (nilfs_test_opt(sbi, ERRORS_RO)) {
125 printk(KERN_CRIT "Remounting filesystem read-only\n");
126 sb->s_flags |= MS_RDONLY;
127 }
128 }
129
130 if (nilfs_test_opt(sbi, ERRORS_PANIC))
131 panic("NILFS (device %s): panic forced after error\n",
132 sb->s_id);
133}
134
135void nilfs_warning(struct super_block *sb, const char *function,
136 const char *fmt, ...)
137{
138 va_list args;
139
140 va_start(args, fmt);
141 printk(KERN_WARNING "NILFS warning (device %s): %s: ",
142 sb->s_id, function);
143 vprintk(fmt, args);
144 printk("\n");
145 va_end(args);
146}
147
783f6184 148
a53b4751 149struct inode *nilfs_alloc_inode_common(struct the_nilfs *nilfs)
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150{
151 struct nilfs_inode_info *ii;
152
153 ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS);
154 if (!ii)
155 return NULL;
156 ii->i_bh = NULL;
157 ii->i_state = 0;
0e14a359 158 ii->i_cno = 0;
783f6184 159 ii->vfs_inode.i_version = 1;
a53b4751 160 nilfs_btnode_cache_init(&ii->i_btnode_cache, nilfs->ns_bdi);
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161 return &ii->vfs_inode;
162}
163
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164struct inode *nilfs_alloc_inode(struct super_block *sb)
165{
166 return nilfs_alloc_inode_common(NILFS_SB(sb)->s_nilfs);
167}
168
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169void nilfs_destroy_inode(struct inode *inode)
170{
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171 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
172
173 if (mdi) {
174 kfree(mdi->mi_bgl); /* kfree(NULL) is safe */
175 kfree(mdi);
176 }
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177 kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode));
178}
179
b2ac86e1 180static int nilfs_sync_super(struct nilfs_sb_info *sbi, int flag)
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RK
181{
182 struct the_nilfs *nilfs = sbi->s_nilfs;
183 int err;
783f6184 184
783f6184 185 retry:
e339ad31 186 set_buffer_dirty(nilfs->ns_sbh[0]);
87e99511
CH
187
188 if (nilfs_test_opt(sbi, BARRIER)) {
189 err = __sync_dirty_buffer(nilfs->ns_sbh[0],
190 WRITE_SYNC | WRITE_BARRIER);
191 if (err == -EOPNOTSUPP) {
192 nilfs_warning(sbi->s_super, __func__,
193 "barrier-based sync failed. "
194 "disabling barriers\n");
195 nilfs_clear_opt(sbi, BARRIER);
196 goto retry;
197 }
198 } else {
199 err = sync_dirty_buffer(nilfs->ns_sbh[0]);
783f6184 200 }
87e99511 201
e339ad31 202 if (unlikely(err)) {
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203 printk(KERN_ERR
204 "NILFS: unable to write superblock (err=%d)\n", err);
e339ad31 205 if (err == -EIO && nilfs->ns_sbh[1]) {
b2ac86e1
JS
206 /*
207 * sbp[0] points to newer log than sbp[1],
208 * so copy sbp[0] to sbp[1] to take over sbp[0].
209 */
210 memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0],
211 nilfs->ns_sbsize);
e339ad31
RK
212 nilfs_fall_back_super_block(nilfs);
213 goto retry;
214 }
215 } else {
216 struct nilfs_super_block *sbp = nilfs->ns_sbp[0];
217
b2ac86e1
JS
218 nilfs->ns_sbwcount++;
219
e339ad31
RK
220 /*
221 * The latest segment becomes trailable from the position
222 * written in superblock.
223 */
783f6184 224 clear_nilfs_discontinued(nilfs);
e339ad31
RK
225
226 /* update GC protection for recent segments */
227 if (nilfs->ns_sbh[1]) {
b2ac86e1 228 if (flag == NILFS_SB_COMMIT_ALL) {
e339ad31 229 set_buffer_dirty(nilfs->ns_sbh[1]);
b2ac86e1
JS
230 if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0)
231 goto out;
e339ad31 232 }
b2ac86e1
JS
233 if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) <
234 le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno))
235 sbp = nilfs->ns_sbp[1];
e339ad31 236 }
783f6184 237
b2ac86e1
JS
238 spin_lock(&nilfs->ns_last_segment_lock);
239 nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq);
240 spin_unlock(&nilfs->ns_last_segment_lock);
241 }
242 out:
783f6184
RK
243 return err;
244}
245
60f46b7e
RK
246void nilfs_set_log_cursor(struct nilfs_super_block *sbp,
247 struct the_nilfs *nilfs)
248{
249 sector_t nfreeblocks;
250
251 /* nilfs->ns_sem must be locked by the caller. */
252 nilfs_count_free_blocks(nilfs, &nfreeblocks);
253 sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks);
254
255 spin_lock(&nilfs->ns_last_segment_lock);
256 sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq);
257 sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg);
258 sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno);
259 spin_unlock(&nilfs->ns_last_segment_lock);
260}
261
b2ac86e1
JS
262struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *sbi,
263 int flip)
783f6184
RK
264{
265 struct the_nilfs *nilfs = sbi->s_nilfs;
e339ad31 266 struct nilfs_super_block **sbp = nilfs->ns_sbp;
783f6184 267
d26493b6 268 /* nilfs->ns_sem must be locked by the caller. */
34cb9b5c 269 if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) {
d26493b6
JS
270 if (sbp[1] &&
271 sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) {
b2ac86e1 272 memcpy(sbp[0], sbp[1], nilfs->ns_sbsize);
d26493b6 273 } else {
e339ad31
RK
274 printk(KERN_CRIT "NILFS: superblock broke on dev %s\n",
275 sbi->s_super->s_id);
d26493b6 276 return NULL;
e339ad31 277 }
b2ac86e1
JS
278 } else if (sbp[1] &&
279 sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) {
280 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
e339ad31 281 }
b2ac86e1
JS
282
283 if (flip && sbp[1])
284 nilfs_swap_super_block(nilfs);
285
d26493b6
JS
286 return sbp;
287}
288
b2ac86e1 289int nilfs_commit_super(struct nilfs_sb_info *sbi, int flag)
d26493b6
JS
290{
291 struct the_nilfs *nilfs = sbi->s_nilfs;
292 struct nilfs_super_block **sbp = nilfs->ns_sbp;
293 time_t t;
294
295 /* nilfs->ns_sem must be locked by the caller. */
e339ad31 296 t = get_seconds();
b2ac86e1 297 nilfs->ns_sbwtime = t;
e339ad31
RK
298 sbp[0]->s_wtime = cpu_to_le64(t);
299 sbp[0]->s_sum = 0;
300 sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed,
301 (unsigned char *)sbp[0],
302 nilfs->ns_sbsize));
b2ac86e1
JS
303 if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) {
304 sbp[1]->s_wtime = sbp[0]->s_wtime;
305 sbp[1]->s_sum = 0;
306 sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed,
307 (unsigned char *)sbp[1],
308 nilfs->ns_sbsize));
e339ad31 309 }
e605f0a7 310 clear_nilfs_sb_dirty(nilfs);
b2ac86e1 311 return nilfs_sync_super(sbi, flag);
783f6184
RK
312}
313
7ecaa46c
RK
314/**
315 * nilfs_cleanup_super() - write filesystem state for cleanup
316 * @sbi: nilfs_sb_info to be unmounted or degraded to read-only
317 *
318 * This function restores state flags in the on-disk super block.
319 * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the
320 * filesystem was not clean previously.
321 */
322int nilfs_cleanup_super(struct nilfs_sb_info *sbi)
323{
d26493b6 324 struct nilfs_super_block **sbp;
b2ac86e1 325 int flag = NILFS_SB_COMMIT;
d26493b6 326 int ret = -EIO;
7ecaa46c 327
b2ac86e1 328 sbp = nilfs_prepare_super(sbi, 0);
d26493b6
JS
329 if (sbp) {
330 sbp[0]->s_state = cpu_to_le16(sbi->s_nilfs->ns_mount_state);
b2ac86e1
JS
331 nilfs_set_log_cursor(sbp[0], sbi->s_nilfs);
332 if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) {
333 /*
334 * make the "clean" flag also to the opposite
335 * super block if both super blocks point to
336 * the same checkpoint.
337 */
338 sbp[1]->s_state = sbp[0]->s_state;
339 flag = NILFS_SB_COMMIT_ALL;
340 }
341 ret = nilfs_commit_super(sbi, flag);
d26493b6 342 }
7ecaa46c
RK
343 return ret;
344}
345
783f6184
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346static void nilfs_put_super(struct super_block *sb)
347{
348 struct nilfs_sb_info *sbi = NILFS_SB(sb);
349 struct the_nilfs *nilfs = sbi->s_nilfs;
350
351 nilfs_detach_segment_constructor(sbi);
352
353 if (!(sb->s_flags & MS_RDONLY)) {
354 down_write(&nilfs->ns_sem);
7ecaa46c 355 nilfs_cleanup_super(sbi);
783f6184
RK
356 up_write(&nilfs->ns_sem);
357 }
358
f1e89c86
RK
359 iput(nilfs->ns_sufile);
360 iput(nilfs->ns_cpfile);
361 iput(nilfs->ns_dat);
362
348fe8da 363 destroy_nilfs(nilfs);
783f6184
RK
364 sbi->s_super = NULL;
365 sb->s_fs_info = NULL;
f11459ad 366 kfree(sbi);
783f6184
RK
367}
368
783f6184
RK
369static int nilfs_sync_fs(struct super_block *sb, int wait)
370{
6233caa9
JS
371 struct nilfs_sb_info *sbi = NILFS_SB(sb);
372 struct the_nilfs *nilfs = sbi->s_nilfs;
d26493b6 373 struct nilfs_super_block **sbp;
783f6184
RK
374 int err = 0;
375
376 /* This function is called when super block should be written back */
377 if (wait)
378 err = nilfs_construct_segment(sb);
6233caa9
JS
379
380 down_write(&nilfs->ns_sem);
d26493b6 381 if (nilfs_sb_dirty(nilfs)) {
b2ac86e1
JS
382 sbp = nilfs_prepare_super(sbi, nilfs_sb_will_flip(nilfs));
383 if (likely(sbp)) {
384 nilfs_set_log_cursor(sbp[0], nilfs);
385 nilfs_commit_super(sbi, NILFS_SB_COMMIT);
386 }
d26493b6 387 }
6233caa9
JS
388 up_write(&nilfs->ns_sem);
389
783f6184
RK
390 return err;
391}
392
4d8d9293
RK
393int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno, int curr_mnt,
394 struct nilfs_root **rootp)
783f6184
RK
395{
396 struct the_nilfs *nilfs = sbi->s_nilfs;
4d8d9293 397 struct nilfs_root *root;
783f6184
RK
398 struct nilfs_checkpoint *raw_cp;
399 struct buffer_head *bh_cp;
4d8d9293
RK
400 int err = -ENOMEM;
401
402 root = nilfs_find_or_create_root(
403 nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno);
404 if (!root)
405 return err;
783f6184 406
e912a5b6
RK
407 if (root->ifile)
408 goto reuse; /* already attached checkpoint */
783f6184 409
1154ecbd 410 down_read(&nilfs->ns_segctor_sem);
783f6184
RK
411 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp,
412 &bh_cp);
1154ecbd 413 up_read(&nilfs->ns_segctor_sem);
783f6184
RK
414 if (unlikely(err)) {
415 if (err == -ENOENT || err == -EINVAL) {
416 printk(KERN_ERR
417 "NILFS: Invalid checkpoint "
418 "(checkpoint number=%llu)\n",
419 (unsigned long long)cno);
420 err = -EINVAL;
421 }
422 goto failed;
423 }
f1e89c86
RK
424
425 err = nilfs_ifile_read(sbi->s_super, root, nilfs->ns_inode_size,
426 &raw_cp->cp_ifile_inode, &root->ifile);
427 if (err)
783f6184 428 goto failed_bh;
b7c06342
RK
429
430 atomic_set(&root->inodes_count, le64_to_cpu(raw_cp->cp_inodes_count));
431 atomic_set(&root->blocks_count, le64_to_cpu(raw_cp->cp_blocks_count));
783f6184
RK
432
433 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
4d8d9293 434
e912a5b6 435 reuse:
4d8d9293 436 *rootp = root;
783f6184
RK
437 return 0;
438
439 failed_bh:
440 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
441 failed:
4d8d9293 442 nilfs_put_root(root);
783f6184
RK
443
444 return err;
445}
446
783f6184
RK
447static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
448{
449 struct super_block *sb = dentry->d_sb;
b7c06342
RK
450 struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root;
451 struct the_nilfs *nilfs = root->nilfs;
c306af23 452 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
783f6184
RK
453 unsigned long long blocks;
454 unsigned long overhead;
455 unsigned long nrsvblocks;
456 sector_t nfreeblocks;
783f6184
RK
457 int err;
458
459 /*
460 * Compute all of the segment blocks
461 *
462 * The blocks before first segment and after last segment
463 * are excluded.
464 */
465 blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments
466 - nilfs->ns_first_data_block;
467 nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment;
468
469 /*
470 * Compute the overhead
471 *
7a65004b 472 * When distributing meta data blocks outside segment structure,
783f6184
RK
473 * We must count them as the overhead.
474 */
475 overhead = 0;
476
477 err = nilfs_count_free_blocks(nilfs, &nfreeblocks);
478 if (unlikely(err))
479 return err;
480
481 buf->f_type = NILFS_SUPER_MAGIC;
482 buf->f_bsize = sb->s_blocksize;
483 buf->f_blocks = blocks - overhead;
484 buf->f_bfree = nfreeblocks;
485 buf->f_bavail = (buf->f_bfree >= nrsvblocks) ?
486 (buf->f_bfree - nrsvblocks) : 0;
b7c06342 487 buf->f_files = atomic_read(&root->inodes_count);
783f6184
RK
488 buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */
489 buf->f_namelen = NILFS_NAME_LEN;
c306af23
RK
490 buf->f_fsid.val[0] = (u32)id;
491 buf->f_fsid.val[1] = (u32)(id >> 32);
492
783f6184
RK
493 return 0;
494}
495
b58a285b
JS
496static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
497{
498 struct super_block *sb = vfs->mnt_sb;
499 struct nilfs_sb_info *sbi = NILFS_SB(sb);
f11459ad 500 struct nilfs_root *root = NILFS_I(vfs->mnt_root->d_inode)->i_root;
b58a285b
JS
501
502 if (!nilfs_test_opt(sbi, BARRIER))
c6b4d57d 503 seq_puts(seq, ",nobarrier");
f11459ad
RK
504 if (root->cno != NILFS_CPTREE_CURRENT_CNO)
505 seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno);
b58a285b 506 if (nilfs_test_opt(sbi, ERRORS_PANIC))
c6b4d57d 507 seq_puts(seq, ",errors=panic");
277a6a34 508 if (nilfs_test_opt(sbi, ERRORS_CONT))
c6b4d57d 509 seq_puts(seq, ",errors=continue");
b58a285b 510 if (nilfs_test_opt(sbi, STRICT_ORDER))
c6b4d57d 511 seq_puts(seq, ",order=strict");
0234576d 512 if (nilfs_test_opt(sbi, NORECOVERY))
c6b4d57d 513 seq_puts(seq, ",norecovery");
e902ec99 514 if (nilfs_test_opt(sbi, DISCARD))
c6b4d57d 515 seq_puts(seq, ",discard");
b58a285b
JS
516
517 return 0;
518}
519
b87221de 520static const struct super_operations nilfs_sops = {
783f6184
RK
521 .alloc_inode = nilfs_alloc_inode,
522 .destroy_inode = nilfs_destroy_inode,
523 .dirty_inode = nilfs_dirty_inode,
524 /* .write_inode = nilfs_write_inode, */
525 /* .put_inode = nilfs_put_inode, */
526 /* .drop_inode = nilfs_drop_inode, */
6fd1e5c9 527 .evict_inode = nilfs_evict_inode,
783f6184 528 .put_super = nilfs_put_super,
1dfa2710 529 /* .write_super = nilfs_write_super, */
783f6184
RK
530 .sync_fs = nilfs_sync_fs,
531 /* .write_super_lockfs */
532 /* .unlockfs */
533 .statfs = nilfs_statfs,
534 .remount_fs = nilfs_remount,
783f6184 535 /* .umount_begin */
b58a285b 536 .show_options = nilfs_show_options
783f6184
RK
537};
538
783f6184
RK
539enum {
540 Opt_err_cont, Opt_err_panic, Opt_err_ro,
773bc4f3 541 Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery,
802d3177 542 Opt_discard, Opt_nodiscard, Opt_err,
783f6184
RK
543};
544
545static match_table_t tokens = {
546 {Opt_err_cont, "errors=continue"},
547 {Opt_err_panic, "errors=panic"},
548 {Opt_err_ro, "errors=remount-ro"},
773bc4f3 549 {Opt_barrier, "barrier"},
91f1953b 550 {Opt_nobarrier, "nobarrier"},
783f6184
RK
551 {Opt_snapshot, "cp=%u"},
552 {Opt_order, "order=%s"},
0234576d 553 {Opt_norecovery, "norecovery"},
e902ec99 554 {Opt_discard, "discard"},
802d3177 555 {Opt_nodiscard, "nodiscard"},
783f6184
RK
556 {Opt_err, NULL}
557};
558
7c017457 559static int parse_options(char *options, struct super_block *sb, int is_remount)
783f6184
RK
560{
561 struct nilfs_sb_info *sbi = NILFS_SB(sb);
562 char *p;
563 substring_t args[MAX_OPT_ARGS];
564 int option;
565
566 if (!options)
567 return 1;
568
569 while ((p = strsep(&options, ",")) != NULL) {
570 int token;
571 if (!*p)
572 continue;
573
574 token = match_token(p, tokens, args);
575 switch (token) {
773bc4f3
RK
576 case Opt_barrier:
577 nilfs_set_opt(sbi, BARRIER);
578 break;
91f1953b
JS
579 case Opt_nobarrier:
580 nilfs_clear_opt(sbi, BARRIER);
783f6184
RK
581 break;
582 case Opt_order:
583 if (strcmp(args[0].from, "relaxed") == 0)
584 /* Ordered data semantics */
585 nilfs_clear_opt(sbi, STRICT_ORDER);
586 else if (strcmp(args[0].from, "strict") == 0)
587 /* Strict in-order semantics */
588 nilfs_set_opt(sbi, STRICT_ORDER);
589 else
590 return 0;
591 break;
592 case Opt_err_panic:
593 nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC);
594 break;
595 case Opt_err_ro:
596 nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO);
597 break;
598 case Opt_err_cont:
599 nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT);
600 break;
601 case Opt_snapshot:
602 if (match_int(&args[0], &option) || option <= 0)
603 return 0;
7c017457 604 if (is_remount) {
f11459ad
RK
605 printk(KERN_ERR
606 "NILFS: \"%s\" option is invalid "
607 "for remount.\n", p);
783f6184 608 return 0;
7c017457 609 }
783f6184 610 break;
0234576d
RK
611 case Opt_norecovery:
612 nilfs_set_opt(sbi, NORECOVERY);
613 break;
e902ec99
JS
614 case Opt_discard:
615 nilfs_set_opt(sbi, DISCARD);
616 break;
802d3177
RK
617 case Opt_nodiscard:
618 nilfs_clear_opt(sbi, DISCARD);
619 break;
783f6184
RK
620 default:
621 printk(KERN_ERR
622 "NILFS: Unrecognized mount option \"%s\"\n", p);
623 return 0;
624 }
625 }
626 return 1;
627}
628
629static inline void
630nilfs_set_default_options(struct nilfs_sb_info *sbi,
631 struct nilfs_super_block *sbp)
632{
633 sbi->s_mount_opt =
277a6a34 634 NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER;
783f6184
RK
635}
636
637static int nilfs_setup_super(struct nilfs_sb_info *sbi)
638{
639 struct the_nilfs *nilfs = sbi->s_nilfs;
d26493b6
JS
640 struct nilfs_super_block **sbp;
641 int max_mnt_count;
642 int mnt_count;
643
644 /* nilfs->ns_sem must be locked by the caller. */
b2ac86e1 645 sbp = nilfs_prepare_super(sbi, 0);
d26493b6
JS
646 if (!sbp)
647 return -EIO;
648
649 max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count);
650 mnt_count = le16_to_cpu(sbp[0]->s_mnt_count);
783f6184 651
f50a4c81 652 if (nilfs->ns_mount_state & NILFS_ERROR_FS) {
783f6184
RK
653 printk(KERN_WARNING
654 "NILFS warning: mounting fs with errors\n");
655#if 0
656 } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) {
657 printk(KERN_WARNING
658 "NILFS warning: maximal mount count reached\n");
659#endif
660 }
661 if (!max_mnt_count)
d26493b6 662 sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT);
783f6184 663
d26493b6
JS
664 sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1);
665 sbp[0]->s_state =
666 cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS);
667 sbp[0]->s_mtime = cpu_to_le64(get_seconds());
b2ac86e1
JS
668 /* synchronize sbp[1] with sbp[0] */
669 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
670 return nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL);
783f6184
RK
671}
672
e339ad31
RK
673struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb,
674 u64 pos, int blocksize,
675 struct buffer_head **pbh)
783f6184 676{
e339ad31
RK
677 unsigned long long sb_index = pos;
678 unsigned long offset;
783f6184 679
e339ad31 680 offset = do_div(sb_index, blocksize);
783f6184 681 *pbh = sb_bread(sb, sb_index);
e339ad31 682 if (!*pbh)
783f6184 683 return NULL;
783f6184
RK
684 return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset);
685}
686
783f6184
RK
687int nilfs_store_magic_and_option(struct super_block *sb,
688 struct nilfs_super_block *sbp,
689 char *data)
690{
691 struct nilfs_sb_info *sbi = NILFS_SB(sb);
692
783f6184
RK
693 sb->s_magic = le16_to_cpu(sbp->s_magic);
694
695 /* FS independent flags */
696#ifdef NILFS_ATIME_DISABLE
697 sb->s_flags |= MS_NOATIME;
698#endif
699
783f6184
RK
700 nilfs_set_default_options(sbi, sbp);
701
702 sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid);
703 sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid);
704 sbi->s_interval = le32_to_cpu(sbp->s_c_interval);
705 sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max);
706
7c017457 707 return !parse_options(data, sb, 0) ? -EINVAL : 0 ;
783f6184
RK
708}
709
c5ca48aa
RK
710int nilfs_check_feature_compatibility(struct super_block *sb,
711 struct nilfs_super_block *sbp)
712{
713 __u64 features;
714
715 features = le64_to_cpu(sbp->s_feature_incompat) &
716 ~NILFS_FEATURE_INCOMPAT_SUPP;
717 if (features) {
718 printk(KERN_ERR "NILFS: couldn't mount because of unsupported "
719 "optional features (%llx)\n",
720 (unsigned long long)features);
721 return -EINVAL;
722 }
723 features = le64_to_cpu(sbp->s_feature_compat_ro) &
724 ~NILFS_FEATURE_COMPAT_RO_SUPP;
725 if (!(sb->s_flags & MS_RDONLY) && features) {
726 printk(KERN_ERR "NILFS: couldn't mount RDWR because of "
727 "unsupported optional features (%llx)\n",
728 (unsigned long long)features);
729 return -EINVAL;
730 }
731 return 0;
732}
733
367ea334
RK
734static int nilfs_get_root_dentry(struct super_block *sb,
735 struct nilfs_root *root,
736 struct dentry **root_dentry)
737{
738 struct inode *inode;
739 struct dentry *dentry;
740 int ret = 0;
741
742 inode = nilfs_iget(sb, root, NILFS_ROOT_INO);
743 if (IS_ERR(inode)) {
744 printk(KERN_ERR "NILFS: get root inode failed\n");
745 ret = PTR_ERR(inode);
746 goto out;
747 }
748 if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) {
749 iput(inode);
750 printk(KERN_ERR "NILFS: corrupt root inode.\n");
751 ret = -EINVAL;
752 goto out;
753 }
754
f11459ad
RK
755 if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
756 dentry = d_find_alias(inode);
757 if (!dentry) {
758 dentry = d_alloc_root(inode);
759 if (!dentry) {
760 iput(inode);
761 ret = -ENOMEM;
762 goto failed_dentry;
763 }
764 } else {
765 iput(inode);
766 }
767 } else {
768 dentry = d_obtain_alias(inode);
769 if (IS_ERR(dentry)) {
770 ret = PTR_ERR(dentry);
771 goto failed_dentry;
772 }
367ea334
RK
773 }
774 *root_dentry = dentry;
775 out:
776 return ret;
f11459ad
RK
777
778 failed_dentry:
779 printk(KERN_ERR "NILFS: get root dentry failed\n");
780 goto out;
367ea334
RK
781}
782
ab4d8f7e
RK
783static int nilfs_attach_snapshot(struct super_block *s, __u64 cno,
784 struct dentry **root_dentry)
785{
786 struct the_nilfs *nilfs = NILFS_SB(s)->s_nilfs;
787 struct nilfs_root *root;
788 int ret;
789
790 down_read(&nilfs->ns_segctor_sem);
791 ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno);
792 up_read(&nilfs->ns_segctor_sem);
793 if (ret < 0) {
794 ret = (ret == -ENOENT) ? -EINVAL : ret;
795 goto out;
796 } else if (!ret) {
797 printk(KERN_ERR "NILFS: The specified checkpoint is "
798 "not a snapshot (checkpoint number=%llu).\n",
799 (unsigned long long)cno);
800 ret = -EINVAL;
801 goto out;
802 }
803
804 ret = nilfs_attach_checkpoint(NILFS_SB(s), cno, false, &root);
805 if (ret) {
806 printk(KERN_ERR "NILFS: error loading snapshot "
807 "(checkpoint number=%llu).\n",
808 (unsigned long long)cno);
809 goto out;
810 }
811 ret = nilfs_get_root_dentry(s, root, root_dentry);
812 nilfs_put_root(root);
813 out:
814 return ret;
815}
816
f11459ad
RK
817static int nilfs_tree_was_touched(struct dentry *root_dentry)
818{
819 return atomic_read(&root_dentry->d_count) > 1;
820}
821
822/**
823 * nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint
824 * @root_dentry: root dentry of the tree to be shrunk
825 *
826 * This function returns true if the tree was in-use.
827 */
828static int nilfs_try_to_shrink_tree(struct dentry *root_dentry)
829{
830 if (have_submounts(root_dentry))
831 return true;
832 shrink_dcache_parent(root_dentry);
833 return nilfs_tree_was_touched(root_dentry);
834}
835
783f6184
RK
836/**
837 * nilfs_fill_super() - initialize a super block instance
838 * @sb: super_block
839 * @data: mount options
840 * @silent: silent mode flag
783f6184 841 *
aa7dfb89 842 * This function is called exclusively by nilfs->ns_mount_mutex.
783f6184
RK
843 * So, the recovery process is protected from other simultaneous mounts.
844 */
845static int
348fe8da 846nilfs_fill_super(struct super_block *sb, void *data, int silent)
783f6184 847{
348fe8da 848 struct the_nilfs *nilfs;
783f6184 849 struct nilfs_sb_info *sbi;
4d8d9293 850 struct nilfs_root *fsroot;
783f6184 851 __u64 cno;
ab4d8f7e 852 int err;
783f6184
RK
853
854 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
855 if (!sbi)
856 return -ENOMEM;
857
858 sb->s_fs_info = sbi;
348fe8da 859 sbi->s_super = sb;
783f6184 860
348fe8da
RK
861 nilfs = alloc_nilfs(sb->s_bdev);
862 if (!nilfs) {
863 err = -ENOMEM;
864 goto failed_sbi;
865 }
783f6184 866 sbi->s_nilfs = nilfs;
783f6184
RK
867
868 err = init_nilfs(nilfs, sbi, (char *)data);
869 if (err)
348fe8da 870 goto failed_nilfs;
783f6184
RK
871
872 spin_lock_init(&sbi->s_inode_lock);
873 INIT_LIST_HEAD(&sbi->s_dirty_files);
783f6184
RK
874
875 /*
876 * Following initialization is overlapped because
877 * nilfs_sb_info structure has been cleared at the beginning.
878 * But we reserve them to keep our interest and make ready
879 * for the future change.
880 */
881 get_random_bytes(&sbi->s_next_generation,
882 sizeof(sbi->s_next_generation));
883 spin_lock_init(&sbi->s_next_gen_lock);
884
885 sb->s_op = &nilfs_sops;
886 sb->s_export_op = &nilfs_export_ops;
887 sb->s_root = NULL;
61239230 888 sb->s_time_gran = 1;
973bec34 889 sb->s_bdi = nilfs->ns_bdi;
783f6184 890
f50a4c81
RK
891 err = load_nilfs(nilfs, sbi);
892 if (err)
348fe8da 893 goto failed_nilfs;
f50a4c81 894
ab4d8f7e
RK
895 cno = nilfs_last_cno(nilfs);
896 err = nilfs_attach_checkpoint(sbi, cno, true, &fsroot);
783f6184 897 if (err) {
f11459ad
RK
898 printk(KERN_ERR "NILFS: error loading last checkpoint "
899 "(checkpoint number=%llu).\n", (unsigned long long)cno);
f1e89c86 900 goto failed_unload;
783f6184
RK
901 }
902
903 if (!(sb->s_flags & MS_RDONLY)) {
e912a5b6 904 err = nilfs_attach_segment_constructor(sbi, fsroot);
783f6184
RK
905 if (err)
906 goto failed_checkpoint;
907 }
908
367ea334
RK
909 err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root);
910 if (err)
783f6184 911 goto failed_segctor;
783f6184 912
4d8d9293
RK
913 nilfs_put_root(fsroot);
914
783f6184
RK
915 if (!(sb->s_flags & MS_RDONLY)) {
916 down_write(&nilfs->ns_sem);
917 nilfs_setup_super(sbi);
918 up_write(&nilfs->ns_sem);
919 }
920
783f6184
RK
921 return 0;
922
783f6184
RK
923 failed_segctor:
924 nilfs_detach_segment_constructor(sbi);
925
926 failed_checkpoint:
4d8d9293 927 nilfs_put_root(fsroot);
783f6184 928
f1e89c86
RK
929 failed_unload:
930 iput(nilfs->ns_sufile);
931 iput(nilfs->ns_cpfile);
932 iput(nilfs->ns_dat);
933
348fe8da
RK
934 failed_nilfs:
935 destroy_nilfs(nilfs);
936
783f6184 937 failed_sbi:
783f6184 938 sb->s_fs_info = NULL;
f11459ad 939 kfree(sbi);
783f6184
RK
940 return err;
941}
942
943static int nilfs_remount(struct super_block *sb, int *flags, char *data)
944{
945 struct nilfs_sb_info *sbi = NILFS_SB(sb);
783f6184
RK
946 struct the_nilfs *nilfs = sbi->s_nilfs;
947 unsigned long old_sb_flags;
948 struct nilfs_mount_options old_opts;
f11459ad 949 int err;
783f6184
RK
950
951 old_sb_flags = sb->s_flags;
952 old_opts.mount_opt = sbi->s_mount_opt;
783f6184 953
7c017457 954 if (!parse_options(data, sb, 1)) {
783f6184
RK
955 err = -EINVAL;
956 goto restore_opts;
957 }
958 sb->s_flags = (sb->s_flags & ~MS_POSIXACL);
959
d240e067 960 err = -EINVAL;
783f6184 961
0234576d
RK
962 if (!nilfs_valid_fs(nilfs)) {
963 printk(KERN_WARNING "NILFS (device %s): couldn't "
964 "remount because the filesystem is in an "
965 "incomplete recovery state.\n", sb->s_id);
0234576d
RK
966 goto restore_opts;
967 }
968
783f6184
RK
969 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
970 goto out;
971 if (*flags & MS_RDONLY) {
972 /* Shutting down the segment constructor */
973 nilfs_detach_segment_constructor(sbi);
974 sb->s_flags |= MS_RDONLY;
975
783f6184
RK
976 /*
977 * Remounting a valid RW partition RDONLY, so set
978 * the RDONLY flag and then mark the partition as valid again.
979 */
980 down_write(&nilfs->ns_sem);
7ecaa46c 981 nilfs_cleanup_super(sbi);
783f6184
RK
982 up_write(&nilfs->ns_sem);
983 } else {
c5ca48aa 984 __u64 features;
e912a5b6 985 struct nilfs_root *root;
c5ca48aa 986
783f6184
RK
987 /*
988 * Mounting a RDONLY partition read-write, so reread and
989 * store the current valid flag. (It may have been changed
990 * by fsck since we originally mounted the partition.)
991 */
c5ca48aa
RK
992 down_read(&nilfs->ns_sem);
993 features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) &
994 ~NILFS_FEATURE_COMPAT_RO_SUPP;
995 up_read(&nilfs->ns_sem);
996 if (features) {
997 printk(KERN_WARNING "NILFS (device %s): couldn't "
998 "remount RDWR because of unsupported optional "
999 "features (%llx)\n",
1000 sb->s_id, (unsigned long long)features);
1001 err = -EROFS;
1002 goto restore_opts;
1003 }
1004
783f6184 1005 sb->s_flags &= ~MS_RDONLY;
783f6184 1006
e912a5b6
RK
1007 root = NILFS_I(sb->s_root->d_inode)->i_root;
1008 err = nilfs_attach_segment_constructor(sbi, root);
783f6184 1009 if (err)
e59399d0 1010 goto restore_opts;
783f6184
RK
1011
1012 down_write(&nilfs->ns_sem);
1013 nilfs_setup_super(sbi);
1014 up_write(&nilfs->ns_sem);
783f6184
RK
1015 }
1016 out:
1017 return 0;
1018
783f6184
RK
1019 restore_opts:
1020 sb->s_flags = old_sb_flags;
1021 sbi->s_mount_opt = old_opts.mount_opt;
783f6184
RK
1022 return err;
1023}
1024
1025struct nilfs_super_data {
1026 struct block_device *bdev;
6dd47406 1027 struct nilfs_sb_info *sbi;
783f6184
RK
1028 __u64 cno;
1029 int flags;
1030};
1031
1032/**
1033 * nilfs_identify - pre-read mount options needed to identify mount instance
1034 * @data: mount options
1035 * @sd: nilfs_super_data
1036 */
1037static int nilfs_identify(char *data, struct nilfs_super_data *sd)
1038{
1039 char *p, *options = data;
1040 substring_t args[MAX_OPT_ARGS];
1041 int option, token;
1042 int ret = 0;
1043
1044 do {
1045 p = strsep(&options, ",");
1046 if (p != NULL && *p) {
1047 token = match_token(p, tokens, args);
1048 if (token == Opt_snapshot) {
1049 if (!(sd->flags & MS_RDONLY))
1050 ret++;
1051 else {
1052 ret = match_int(&args[0], &option);
1053 if (!ret) {
1054 if (option > 0)
1055 sd->cno = option;
1056 else
1057 ret++;
1058 }
1059 }
1060 }
1061 if (ret)
1062 printk(KERN_ERR
1063 "NILFS: invalid mount option: %s\n", p);
1064 }
1065 if (!options)
1066 break;
1067 BUG_ON(options == data);
1068 *(options - 1) = ',';
1069 } while (!ret);
1070 return ret;
1071}
1072
1073static int nilfs_set_bdev_super(struct super_block *s, void *data)
1074{
f11459ad 1075 s->s_bdev = data;
783f6184
RK
1076 s->s_dev = s->s_bdev->bd_dev;
1077 return 0;
1078}
1079
1080static int nilfs_test_bdev_super(struct super_block *s, void *data)
783f6184 1081{
f11459ad 1082 return (void *)s->s_bdev == data;
783f6184
RK
1083}
1084
1085static int
1086nilfs_get_sb(struct file_system_type *fs_type, int flags,
1087 const char *dev_name, void *data, struct vfsmount *mnt)
1088{
1089 struct nilfs_super_data sd;
33c8e57c 1090 struct super_block *s;
13e90559 1091 fmode_t mode = FMODE_READ;
f11459ad
RK
1092 struct dentry *root_dentry;
1093 int err, s_new = false;
783f6184 1094
13e90559
RK
1095 if (!(flags & MS_RDONLY))
1096 mode |= FMODE_WRITE;
1097
1098 sd.bdev = open_bdev_exclusive(dev_name, mode, fs_type);
d6d4c19c 1099 if (IS_ERR(sd.bdev))
783f6184
RK
1100 return PTR_ERR(sd.bdev);
1101
783f6184
RK
1102 sd.cno = 0;
1103 sd.flags = flags;
1104 if (nilfs_identify((char *)data, &sd)) {
1105 err = -EINVAL;
1106 goto failed;
1107 }
1108
f11459ad 1109 s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev);
33c8e57c
RK
1110 if (IS_ERR(s)) {
1111 err = PTR_ERR(s);
348fe8da 1112 goto failed;
783f6184
RK
1113 }
1114
1115 if (!s->s_root) {
1116 char b[BDEVNAME_SIZE];
1117
f11459ad
RK
1118 s_new = true;
1119
33c8e57c 1120 /* New superblock instance created */
783f6184 1121 s->s_flags = flags;
4571b82c 1122 s->s_mode = mode;
783f6184
RK
1123 strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id));
1124 sb_set_blocksize(s, block_size(sd.bdev));
1125
348fe8da 1126 err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
783f6184 1127 if (err)
348fe8da 1128 goto failed_super;
783f6184
RK
1129
1130 s->s_flags |= MS_ACTIVE;
f11459ad
RK
1131 } else if (!sd.cno) {
1132 int busy = false;
1133
1134 if (nilfs_tree_was_touched(s->s_root)) {
1135 busy = nilfs_try_to_shrink_tree(s->s_root);
1136 if (busy && (flags ^ s->s_flags) & MS_RDONLY) {
1137 printk(KERN_ERR "NILFS: the device already "
1138 "has a %s mount.\n",
1139 (s->s_flags & MS_RDONLY) ?
1140 "read-only" : "read/write");
1141 err = -EBUSY;
1142 goto failed_super;
1143 }
1144 }
1145 if (!busy) {
1146 /*
1147 * Try remount to setup mount states if the current
1148 * tree is not mounted and only snapshots use this sb.
1149 */
1150 err = nilfs_remount(s, &flags, data);
1151 if (err)
1152 goto failed_super;
1153 }
1154 }
1155
1156 if (sd.cno) {
1157 err = nilfs_attach_snapshot(s, sd.cno, &root_dentry);
348fe8da 1158 if (err)
f11459ad 1159 goto failed_super;
f11459ad
RK
1160 } else {
1161 root_dentry = dget(s->s_root);
783f6184
RK
1162 }
1163
f11459ad 1164 if (!s_new)
13e90559 1165 close_bdev_exclusive(sd.bdev, mode);
f11459ad
RK
1166
1167 mnt->mnt_sb = s;
1168 mnt->mnt_root = root_dentry;
783f6184
RK
1169 return 0;
1170
f11459ad
RK
1171 failed_super:
1172 deactivate_locked_super(s);
783f6184 1173
348fe8da
RK
1174 failed:
1175 if (!s_new)
1176 close_bdev_exclusive(sd.bdev, mode);
783f6184
RK
1177 return err;
1178}
1179
783f6184
RK
1180struct file_system_type nilfs_fs_type = {
1181 .owner = THIS_MODULE,
1182 .name = "nilfs2",
1183 .get_sb = nilfs_get_sb,
1184 .kill_sb = kill_block_super,
1185 .fs_flags = FS_REQUIRES_DEV,
1186};
1187
41c88bd7 1188static void nilfs_inode_init_once(void *obj)
783f6184 1189{
41c88bd7 1190 struct nilfs_inode_info *ii = obj;
783f6184 1191
41c88bd7
LH
1192 INIT_LIST_HEAD(&ii->i_dirty);
1193#ifdef CONFIG_NILFS_XATTR
1194 init_rwsem(&ii->xattr_sem);
1195#endif
1196 nilfs_btnode_cache_init_once(&ii->i_btnode_cache);
05d0e94b 1197 ii->i_bmap = &ii->i_bmap_data;
41c88bd7
LH
1198 inode_init_once(&ii->vfs_inode);
1199}
783f6184 1200
41c88bd7
LH
1201static void nilfs_segbuf_init_once(void *obj)
1202{
1203 memset(obj, 0, sizeof(struct nilfs_segment_buffer));
1204}
783f6184 1205
41c88bd7
LH
1206static void nilfs_destroy_cachep(void)
1207{
84cb0999 1208 if (nilfs_inode_cachep)
41c88bd7 1209 kmem_cache_destroy(nilfs_inode_cachep);
84cb0999 1210 if (nilfs_transaction_cachep)
41c88bd7 1211 kmem_cache_destroy(nilfs_transaction_cachep);
84cb0999 1212 if (nilfs_segbuf_cachep)
41c88bd7 1213 kmem_cache_destroy(nilfs_segbuf_cachep);
84cb0999 1214 if (nilfs_btree_path_cache)
41c88bd7
LH
1215 kmem_cache_destroy(nilfs_btree_path_cache);
1216}
783f6184 1217
41c88bd7
LH
1218static int __init nilfs_init_cachep(void)
1219{
1220 nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache",
1221 sizeof(struct nilfs_inode_info), 0,
1222 SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once);
1223 if (!nilfs_inode_cachep)
1224 goto fail;
1225
1226 nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache",
1227 sizeof(struct nilfs_transaction_info), 0,
1228 SLAB_RECLAIM_ACCOUNT, NULL);
1229 if (!nilfs_transaction_cachep)
1230 goto fail;
1231
1232 nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache",
1233 sizeof(struct nilfs_segment_buffer), 0,
1234 SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once);
1235 if (!nilfs_segbuf_cachep)
1236 goto fail;
1237
1238 nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache",
1239 sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX,
1240 0, 0, NULL);
1241 if (!nilfs_btree_path_cache)
1242 goto fail;
783f6184
RK
1243
1244 return 0;
1245
41c88bd7
LH
1246fail:
1247 nilfs_destroy_cachep();
1248 return -ENOMEM;
1249}
1250
1251static int __init init_nilfs_fs(void)
1252{
1253 int err;
783f6184 1254
41c88bd7
LH
1255 err = nilfs_init_cachep();
1256 if (err)
1257 goto fail;
783f6184 1258
41c88bd7
LH
1259 err = register_filesystem(&nilfs_fs_type);
1260 if (err)
1261 goto free_cachep;
783f6184 1262
9f130263 1263 printk(KERN_INFO "NILFS version 2 loaded\n");
41c88bd7 1264 return 0;
783f6184 1265
41c88bd7
LH
1266free_cachep:
1267 nilfs_destroy_cachep();
1268fail:
783f6184
RK
1269 return err;
1270}
1271
1272static void __exit exit_nilfs_fs(void)
1273{
41c88bd7 1274 nilfs_destroy_cachep();
783f6184
RK
1275 unregister_filesystem(&nilfs_fs_type);
1276}
1277
1278module_init(init_nilfs_fs)
1279module_exit(exit_nilfs_fs)