Commit | Line | Data |
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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> | |
783f6184 | 46 | #include <linux/crc32.h> |
783f6184 RK |
47 | #include <linux/vfs.h> |
48 | #include <linux/writeback.h> | |
b58a285b JS |
49 | #include <linux/seq_file.h> |
50 | #include <linux/mount.h> | |
783f6184 | 51 | #include "nilfs.h" |
8e656fd5 | 52 | #include "export.h" |
783f6184 RK |
53 | #include "mdt.h" |
54 | #include "alloc.h" | |
05d0e94b RK |
55 | #include "btree.h" |
56 | #include "btnode.h" | |
783f6184 RK |
57 | #include "page.h" |
58 | #include "cpfile.h" | |
4e33f9ea | 59 | #include "sufile.h" /* nilfs_sufile_resize(), nilfs_sufile_set_alloc_range() */ |
783f6184 RK |
60 | #include "ifile.h" |
61 | #include "dat.h" | |
62 | #include "segment.h" | |
63 | #include "segbuf.h" | |
64 | ||
65 | MODULE_AUTHOR("NTT Corp."); | |
66 | MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem " | |
67 | "(NILFS)"); | |
783f6184 RK |
68 | MODULE_LICENSE("GPL"); |
69 | ||
abc0b50b | 70 | static struct kmem_cache *nilfs_inode_cachep; |
41c88bd7 LH |
71 | struct kmem_cache *nilfs_transaction_cachep; |
72 | struct kmem_cache *nilfs_segbuf_cachep; | |
73 | struct kmem_cache *nilfs_btree_path_cache; | |
74 | ||
f7545144 | 75 | static int nilfs_setup_super(struct super_block *sb, int is_mount); |
783f6184 | 76 | static int nilfs_remount(struct super_block *sb, int *flags, char *data); |
783f6184 | 77 | |
f7545144 | 78 | static void nilfs_set_error(struct super_block *sb) |
c8a11c8a | 79 | { |
e3154e97 | 80 | struct the_nilfs *nilfs = sb->s_fs_info; |
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; | |
f7545144 | 86 | sbp = nilfs_prepare_super(sb, 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); | |
f7545144 | 91 | nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); |
d26493b6 | 92 | } |
c8a11c8a RK |
93 | } |
94 | up_write(&nilfs->ns_sem); | |
95 | } | |
96 | ||
783f6184 RK |
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 | */ | |
109 | void nilfs_error(struct super_block *sb, const char *function, | |
110 | const char *fmt, ...) | |
111 | { | |
e3154e97 | 112 | struct the_nilfs *nilfs = sb->s_fs_info; |
b004a5eb | 113 | struct va_format vaf; |
783f6184 RK |
114 | va_list args; |
115 | ||
116 | va_start(args, fmt); | |
b004a5eb JP |
117 | |
118 | vaf.fmt = fmt; | |
119 | vaf.va = &args; | |
120 | ||
121 | printk(KERN_CRIT "NILFS error (device %s): %s: %pV\n", | |
122 | sb->s_id, function, &vaf); | |
123 | ||
783f6184 RK |
124 | va_end(args); |
125 | ||
126 | if (!(sb->s_flags & MS_RDONLY)) { | |
f7545144 | 127 | nilfs_set_error(sb); |
783f6184 | 128 | |
3b2ce58b | 129 | if (nilfs_test_opt(nilfs, ERRORS_RO)) { |
783f6184 RK |
130 | printk(KERN_CRIT "Remounting filesystem read-only\n"); |
131 | sb->s_flags |= MS_RDONLY; | |
132 | } | |
133 | } | |
134 | ||
3b2ce58b | 135 | if (nilfs_test_opt(nilfs, ERRORS_PANIC)) |
783f6184 RK |
136 | panic("NILFS (device %s): panic forced after error\n", |
137 | sb->s_id); | |
138 | } | |
139 | ||
140 | void nilfs_warning(struct super_block *sb, const char *function, | |
141 | const char *fmt, ...) | |
142 | { | |
b004a5eb | 143 | struct va_format vaf; |
783f6184 RK |
144 | va_list args; |
145 | ||
146 | va_start(args, fmt); | |
b004a5eb JP |
147 | |
148 | vaf.fmt = fmt; | |
149 | vaf.va = &args; | |
150 | ||
151 | printk(KERN_WARNING "NILFS warning (device %s): %s: %pV\n", | |
152 | sb->s_id, function, &vaf); | |
153 | ||
783f6184 RK |
154 | va_end(args); |
155 | } | |
156 | ||
783f6184 | 157 | |
2879ed66 | 158 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
783f6184 RK |
159 | { |
160 | struct nilfs_inode_info *ii; | |
161 | ||
162 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); | |
163 | if (!ii) | |
164 | return NULL; | |
165 | ii->i_bh = NULL; | |
166 | ii->i_state = 0; | |
0e14a359 | 167 | ii->i_cno = 0; |
783f6184 | 168 | ii->vfs_inode.i_version = 1; |
aa405b1f | 169 | nilfs_mapping_init(&ii->i_btnode_cache, &ii->vfs_inode, sb->s_bdi); |
783f6184 RK |
170 | return &ii->vfs_inode; |
171 | } | |
172 | ||
fa0d7e3d | 173 | static void nilfs_i_callback(struct rcu_head *head) |
783f6184 | 174 | { |
fa0d7e3d | 175 | struct inode *inode = container_of(head, struct inode, i_rcu); |
b91c9a97 RK |
176 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
177 | ||
178 | if (mdi) { | |
179 | kfree(mdi->mi_bgl); /* kfree(NULL) is safe */ | |
180 | kfree(mdi); | |
181 | } | |
783f6184 RK |
182 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
183 | } | |
184 | ||
fa0d7e3d NP |
185 | void nilfs_destroy_inode(struct inode *inode) |
186 | { | |
187 | call_rcu(&inode->i_rcu, nilfs_i_callback); | |
188 | } | |
189 | ||
f7545144 | 190 | static int nilfs_sync_super(struct super_block *sb, int flag) |
783f6184 | 191 | { |
e3154e97 | 192 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 193 | int err; |
783f6184 | 194 | |
783f6184 | 195 | retry: |
e339ad31 | 196 | set_buffer_dirty(nilfs->ns_sbh[0]); |
3b2ce58b | 197 | if (nilfs_test_opt(nilfs, BARRIER)) { |
87e99511 | 198 | err = __sync_dirty_buffer(nilfs->ns_sbh[0], |
f8c131f5 | 199 | WRITE_SYNC | WRITE_FLUSH_FUA); |
87e99511 CH |
200 | } else { |
201 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); | |
783f6184 | 202 | } |
87e99511 | 203 | |
e339ad31 | 204 | if (unlikely(err)) { |
783f6184 RK |
205 | printk(KERN_ERR |
206 | "NILFS: unable to write superblock (err=%d)\n", err); | |
e339ad31 | 207 | if (err == -EIO && nilfs->ns_sbh[1]) { |
b2ac86e1 JS |
208 | /* |
209 | * sbp[0] points to newer log than sbp[1], | |
210 | * so copy sbp[0] to sbp[1] to take over sbp[0]. | |
211 | */ | |
212 | memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0], | |
213 | nilfs->ns_sbsize); | |
e339ad31 RK |
214 | nilfs_fall_back_super_block(nilfs); |
215 | goto retry; | |
216 | } | |
217 | } else { | |
218 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; | |
219 | ||
b2ac86e1 JS |
220 | nilfs->ns_sbwcount++; |
221 | ||
e339ad31 RK |
222 | /* |
223 | * The latest segment becomes trailable from the position | |
224 | * written in superblock. | |
225 | */ | |
783f6184 | 226 | clear_nilfs_discontinued(nilfs); |
e339ad31 RK |
227 | |
228 | /* update GC protection for recent segments */ | |
229 | if (nilfs->ns_sbh[1]) { | |
b2ac86e1 | 230 | if (flag == NILFS_SB_COMMIT_ALL) { |
e339ad31 | 231 | set_buffer_dirty(nilfs->ns_sbh[1]); |
b2ac86e1 JS |
232 | if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0) |
233 | goto out; | |
e339ad31 | 234 | } |
b2ac86e1 JS |
235 | if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) < |
236 | le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno)) | |
237 | sbp = nilfs->ns_sbp[1]; | |
e339ad31 | 238 | } |
783f6184 | 239 | |
b2ac86e1 JS |
240 | spin_lock(&nilfs->ns_last_segment_lock); |
241 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); | |
242 | spin_unlock(&nilfs->ns_last_segment_lock); | |
243 | } | |
244 | out: | |
783f6184 RK |
245 | return err; |
246 | } | |
247 | ||
60f46b7e RK |
248 | void nilfs_set_log_cursor(struct nilfs_super_block *sbp, |
249 | struct the_nilfs *nilfs) | |
250 | { | |
251 | sector_t nfreeblocks; | |
252 | ||
253 | /* nilfs->ns_sem must be locked by the caller. */ | |
254 | nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
255 | sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
256 | ||
257 | spin_lock(&nilfs->ns_last_segment_lock); | |
258 | sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
259 | sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
260 | sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
261 | spin_unlock(&nilfs->ns_last_segment_lock); | |
262 | } | |
263 | ||
f7545144 | 264 | struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb, |
b2ac86e1 | 265 | int flip) |
783f6184 | 266 | { |
e3154e97 | 267 | struct the_nilfs *nilfs = sb->s_fs_info; |
e339ad31 | 268 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 269 | |
d26493b6 | 270 | /* nilfs->ns_sem must be locked by the caller. */ |
34cb9b5c | 271 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
d26493b6 JS |
272 | if (sbp[1] && |
273 | sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
b2ac86e1 | 274 | memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); |
d26493b6 | 275 | } else { |
e339ad31 | 276 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", |
f7545144 | 277 | sb->s_id); |
d26493b6 | 278 | return NULL; |
e339ad31 | 279 | } |
b2ac86e1 JS |
280 | } else if (sbp[1] && |
281 | sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
282 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
e339ad31 | 283 | } |
b2ac86e1 JS |
284 | |
285 | if (flip && sbp[1]) | |
286 | nilfs_swap_super_block(nilfs); | |
287 | ||
d26493b6 JS |
288 | return sbp; |
289 | } | |
290 | ||
f7545144 | 291 | int nilfs_commit_super(struct super_block *sb, int flag) |
d26493b6 | 292 | { |
e3154e97 | 293 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 JS |
294 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
295 | time_t t; | |
296 | ||
297 | /* nilfs->ns_sem must be locked by the caller. */ | |
e339ad31 | 298 | t = get_seconds(); |
b2ac86e1 | 299 | nilfs->ns_sbwtime = t; |
e339ad31 RK |
300 | sbp[0]->s_wtime = cpu_to_le64(t); |
301 | sbp[0]->s_sum = 0; | |
302 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
303 | (unsigned char *)sbp[0], | |
304 | nilfs->ns_sbsize)); | |
b2ac86e1 JS |
305 | if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) { |
306 | sbp[1]->s_wtime = sbp[0]->s_wtime; | |
307 | sbp[1]->s_sum = 0; | |
308 | sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
309 | (unsigned char *)sbp[1], | |
310 | nilfs->ns_sbsize)); | |
e339ad31 | 311 | } |
e605f0a7 | 312 | clear_nilfs_sb_dirty(nilfs); |
f7545144 | 313 | return nilfs_sync_super(sb, flag); |
783f6184 RK |
314 | } |
315 | ||
7ecaa46c RK |
316 | /** |
317 | * nilfs_cleanup_super() - write filesystem state for cleanup | |
f7545144 | 318 | * @sb: super block instance to be unmounted or degraded to read-only |
7ecaa46c RK |
319 | * |
320 | * This function restores state flags in the on-disk super block. | |
321 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the | |
322 | * filesystem was not clean previously. | |
323 | */ | |
f7545144 | 324 | int nilfs_cleanup_super(struct super_block *sb) |
7ecaa46c | 325 | { |
e3154e97 | 326 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 327 | struct nilfs_super_block **sbp; |
b2ac86e1 | 328 | int flag = NILFS_SB_COMMIT; |
d26493b6 | 329 | int ret = -EIO; |
7ecaa46c | 330 | |
f7545144 | 331 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 | 332 | if (sbp) { |
f7545144 RK |
333 | sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state); |
334 | nilfs_set_log_cursor(sbp[0], nilfs); | |
b2ac86e1 JS |
335 | if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { |
336 | /* | |
337 | * make the "clean" flag also to the opposite | |
338 | * super block if both super blocks point to | |
339 | * the same checkpoint. | |
340 | */ | |
341 | sbp[1]->s_state = sbp[0]->s_state; | |
342 | flag = NILFS_SB_COMMIT_ALL; | |
343 | } | |
f7545144 | 344 | ret = nilfs_commit_super(sb, flag); |
d26493b6 | 345 | } |
7ecaa46c RK |
346 | return ret; |
347 | } | |
348 | ||
cfb0a4bf RK |
349 | /** |
350 | * nilfs_move_2nd_super - relocate secondary super block | |
351 | * @sb: super block instance | |
352 | * @sb2off: new offset of the secondary super block (in bytes) | |
353 | */ | |
354 | static int nilfs_move_2nd_super(struct super_block *sb, loff_t sb2off) | |
355 | { | |
356 | struct the_nilfs *nilfs = sb->s_fs_info; | |
357 | struct buffer_head *nsbh; | |
358 | struct nilfs_super_block *nsbp; | |
359 | sector_t blocknr, newblocknr; | |
360 | unsigned long offset; | |
361 | int sb2i = -1; /* array index of the secondary superblock */ | |
362 | int ret = 0; | |
363 | ||
364 | /* nilfs->ns_sem must be locked by the caller. */ | |
365 | if (nilfs->ns_sbh[1] && | |
366 | nilfs->ns_sbh[1]->b_blocknr > nilfs->ns_first_data_block) { | |
367 | sb2i = 1; | |
368 | blocknr = nilfs->ns_sbh[1]->b_blocknr; | |
369 | } else if (nilfs->ns_sbh[0]->b_blocknr > nilfs->ns_first_data_block) { | |
370 | sb2i = 0; | |
371 | blocknr = nilfs->ns_sbh[0]->b_blocknr; | |
372 | } | |
373 | if (sb2i >= 0 && (u64)blocknr << nilfs->ns_blocksize_bits == sb2off) | |
374 | goto out; /* super block location is unchanged */ | |
375 | ||
376 | /* Get new super block buffer */ | |
377 | newblocknr = sb2off >> nilfs->ns_blocksize_bits; | |
378 | offset = sb2off & (nilfs->ns_blocksize - 1); | |
379 | nsbh = sb_getblk(sb, newblocknr); | |
380 | if (!nsbh) { | |
381 | printk(KERN_WARNING | |
382 | "NILFS warning: unable to move secondary superblock " | |
383 | "to block %llu\n", (unsigned long long)newblocknr); | |
384 | ret = -EIO; | |
385 | goto out; | |
386 | } | |
387 | nsbp = (void *)nsbh->b_data + offset; | |
388 | memset(nsbp, 0, nilfs->ns_blocksize); | |
389 | ||
390 | if (sb2i >= 0) { | |
391 | memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize); | |
392 | brelse(nilfs->ns_sbh[sb2i]); | |
393 | nilfs->ns_sbh[sb2i] = nsbh; | |
394 | nilfs->ns_sbp[sb2i] = nsbp; | |
395 | } else if (nilfs->ns_sbh[0]->b_blocknr < nilfs->ns_first_data_block) { | |
396 | /* secondary super block will be restored to index 1 */ | |
397 | nilfs->ns_sbh[1] = nsbh; | |
398 | nilfs->ns_sbp[1] = nsbp; | |
399 | } else { | |
400 | brelse(nsbh); | |
401 | } | |
402 | out: | |
403 | return ret; | |
404 | } | |
405 | ||
4e33f9ea RK |
406 | /** |
407 | * nilfs_resize_fs - resize the filesystem | |
408 | * @sb: super block instance | |
409 | * @newsize: new size of the filesystem (in bytes) | |
410 | */ | |
411 | int nilfs_resize_fs(struct super_block *sb, __u64 newsize) | |
412 | { | |
413 | struct the_nilfs *nilfs = sb->s_fs_info; | |
414 | struct nilfs_super_block **sbp; | |
415 | __u64 devsize, newnsegs; | |
416 | loff_t sb2off; | |
417 | int ret; | |
418 | ||
419 | ret = -ERANGE; | |
420 | devsize = i_size_read(sb->s_bdev->bd_inode); | |
421 | if (newsize > devsize) | |
422 | goto out; | |
423 | ||
424 | /* | |
425 | * Write lock is required to protect some functions depending | |
426 | * on the number of segments, the number of reserved segments, | |
427 | * and so forth. | |
428 | */ | |
429 | down_write(&nilfs->ns_segctor_sem); | |
430 | ||
431 | sb2off = NILFS_SB2_OFFSET_BYTES(newsize); | |
432 | newnsegs = sb2off >> nilfs->ns_blocksize_bits; | |
433 | do_div(newnsegs, nilfs->ns_blocks_per_segment); | |
434 | ||
435 | ret = nilfs_sufile_resize(nilfs->ns_sufile, newnsegs); | |
436 | up_write(&nilfs->ns_segctor_sem); | |
437 | if (ret < 0) | |
438 | goto out; | |
439 | ||
440 | ret = nilfs_construct_segment(sb); | |
441 | if (ret < 0) | |
442 | goto out; | |
443 | ||
444 | down_write(&nilfs->ns_sem); | |
445 | nilfs_move_2nd_super(sb, sb2off); | |
446 | ret = -EIO; | |
447 | sbp = nilfs_prepare_super(sb, 0); | |
448 | if (likely(sbp)) { | |
449 | nilfs_set_log_cursor(sbp[0], nilfs); | |
450 | /* | |
451 | * Drop NILFS_RESIZE_FS flag for compatibility with | |
452 | * mount-time resize which may be implemented in a | |
453 | * future release. | |
454 | */ | |
455 | sbp[0]->s_state = cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & | |
456 | ~NILFS_RESIZE_FS); | |
457 | sbp[0]->s_dev_size = cpu_to_le64(newsize); | |
458 | sbp[0]->s_nsegments = cpu_to_le64(nilfs->ns_nsegments); | |
459 | if (sbp[1]) | |
460 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
461 | ret = nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); | |
462 | } | |
463 | up_write(&nilfs->ns_sem); | |
464 | ||
465 | /* | |
466 | * Reset the range of allocatable segments last. This order | |
467 | * is important in the case of expansion because the secondary | |
468 | * superblock must be protected from log write until migration | |
469 | * completes. | |
470 | */ | |
471 | if (!ret) | |
472 | nilfs_sufile_set_alloc_range(nilfs->ns_sufile, 0, newnsegs - 1); | |
473 | out: | |
474 | return ret; | |
475 | } | |
476 | ||
783f6184 RK |
477 | static void nilfs_put_super(struct super_block *sb) |
478 | { | |
e3154e97 | 479 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 480 | |
f7545144 | 481 | nilfs_detach_log_writer(sb); |
783f6184 RK |
482 | |
483 | if (!(sb->s_flags & MS_RDONLY)) { | |
484 | down_write(&nilfs->ns_sem); | |
f7545144 | 485 | nilfs_cleanup_super(sb); |
783f6184 RK |
486 | up_write(&nilfs->ns_sem); |
487 | } | |
488 | ||
f1e89c86 RK |
489 | iput(nilfs->ns_sufile); |
490 | iput(nilfs->ns_cpfile); | |
491 | iput(nilfs->ns_dat); | |
492 | ||
348fe8da | 493 | destroy_nilfs(nilfs); |
783f6184 | 494 | sb->s_fs_info = NULL; |
783f6184 RK |
495 | } |
496 | ||
783f6184 RK |
497 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
498 | { | |
e3154e97 | 499 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 500 | struct nilfs_super_block **sbp; |
783f6184 RK |
501 | int err = 0; |
502 | ||
503 | /* This function is called when super block should be written back */ | |
504 | if (wait) | |
505 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
506 | |
507 | down_write(&nilfs->ns_sem); | |
d26493b6 | 508 | if (nilfs_sb_dirty(nilfs)) { |
f7545144 | 509 | sbp = nilfs_prepare_super(sb, nilfs_sb_will_flip(nilfs)); |
b2ac86e1 JS |
510 | if (likely(sbp)) { |
511 | nilfs_set_log_cursor(sbp[0], nilfs); | |
f7545144 | 512 | nilfs_commit_super(sb, NILFS_SB_COMMIT); |
b2ac86e1 | 513 | } |
d26493b6 | 514 | } |
6233caa9 JS |
515 | up_write(&nilfs->ns_sem); |
516 | ||
783f6184 RK |
517 | return err; |
518 | } | |
519 | ||
f7545144 | 520 | int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt, |
4d8d9293 | 521 | struct nilfs_root **rootp) |
783f6184 | 522 | { |
e3154e97 | 523 | struct the_nilfs *nilfs = sb->s_fs_info; |
4d8d9293 | 524 | struct nilfs_root *root; |
783f6184 RK |
525 | struct nilfs_checkpoint *raw_cp; |
526 | struct buffer_head *bh_cp; | |
4d8d9293 | 527 | int err = -ENOMEM; |
783f6184 | 528 | |
4d8d9293 RK |
529 | root = nilfs_find_or_create_root( |
530 | nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); | |
531 | if (!root) | |
532 | return err; | |
783f6184 | 533 | |
e912a5b6 RK |
534 | if (root->ifile) |
535 | goto reuse; /* already attached checkpoint */ | |
783f6184 | 536 | |
1154ecbd | 537 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
538 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
539 | &bh_cp); | |
1154ecbd | 540 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
541 | if (unlikely(err)) { |
542 | if (err == -ENOENT || err == -EINVAL) { | |
543 | printk(KERN_ERR | |
544 | "NILFS: Invalid checkpoint " | |
545 | "(checkpoint number=%llu)\n", | |
546 | (unsigned long long)cno); | |
547 | err = -EINVAL; | |
548 | } | |
549 | goto failed; | |
550 | } | |
f1e89c86 | 551 | |
f7545144 | 552 | err = nilfs_ifile_read(sb, root, nilfs->ns_inode_size, |
f1e89c86 RK |
553 | &raw_cp->cp_ifile_inode, &root->ifile); |
554 | if (err) | |
783f6184 | 555 | goto failed_bh; |
b7c06342 RK |
556 | |
557 | atomic_set(&root->inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); | |
558 | atomic_set(&root->blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); | |
783f6184 RK |
559 | |
560 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
4d8d9293 | 561 | |
e912a5b6 | 562 | reuse: |
4d8d9293 | 563 | *rootp = root; |
783f6184 RK |
564 | return 0; |
565 | ||
566 | failed_bh: | |
567 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
568 | failed: | |
4d8d9293 | 569 | nilfs_put_root(root); |
783f6184 RK |
570 | |
571 | return err; | |
572 | } | |
783f6184 | 573 | |
5beb6e0b RK |
574 | static int nilfs_freeze(struct super_block *sb) |
575 | { | |
e3154e97 | 576 | struct the_nilfs *nilfs = sb->s_fs_info; |
5beb6e0b RK |
577 | int err; |
578 | ||
579 | if (sb->s_flags & MS_RDONLY) | |
580 | return 0; | |
783f6184 | 581 | |
5beb6e0b RK |
582 | /* Mark super block clean */ |
583 | down_write(&nilfs->ns_sem); | |
f7545144 | 584 | err = nilfs_cleanup_super(sb); |
5beb6e0b | 585 | up_write(&nilfs->ns_sem); |
783f6184 RK |
586 | return err; |
587 | } | |
588 | ||
5beb6e0b | 589 | static int nilfs_unfreeze(struct super_block *sb) |
783f6184 | 590 | { |
e3154e97 | 591 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 592 | |
5beb6e0b RK |
593 | if (sb->s_flags & MS_RDONLY) |
594 | return 0; | |
595 | ||
596 | down_write(&nilfs->ns_sem); | |
f7545144 | 597 | nilfs_setup_super(sb, false); |
5beb6e0b RK |
598 | up_write(&nilfs->ns_sem); |
599 | return 0; | |
783f6184 RK |
600 | } |
601 | ||
783f6184 RK |
602 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
603 | { | |
604 | struct super_block *sb = dentry->d_sb; | |
b7c06342 RK |
605 | struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root; |
606 | struct the_nilfs *nilfs = root->nilfs; | |
c306af23 | 607 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
783f6184 RK |
608 | unsigned long long blocks; |
609 | unsigned long overhead; | |
610 | unsigned long nrsvblocks; | |
611 | sector_t nfreeblocks; | |
783f6184 RK |
612 | int err; |
613 | ||
614 | /* | |
615 | * Compute all of the segment blocks | |
616 | * | |
617 | * The blocks before first segment and after last segment | |
618 | * are excluded. | |
619 | */ | |
620 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
621 | - nilfs->ns_first_data_block; | |
622 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
623 | ||
624 | /* | |
625 | * Compute the overhead | |
626 | * | |
7a65004b | 627 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
628 | * We must count them as the overhead. |
629 | */ | |
630 | overhead = 0; | |
631 | ||
632 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
633 | if (unlikely(err)) | |
634 | return err; | |
635 | ||
636 | buf->f_type = NILFS_SUPER_MAGIC; | |
637 | buf->f_bsize = sb->s_blocksize; | |
638 | buf->f_blocks = blocks - overhead; | |
639 | buf->f_bfree = nfreeblocks; | |
640 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
641 | (buf->f_bfree - nrsvblocks) : 0; | |
b7c06342 | 642 | buf->f_files = atomic_read(&root->inodes_count); |
783f6184 RK |
643 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ |
644 | buf->f_namelen = NILFS_NAME_LEN; | |
c306af23 RK |
645 | buf->f_fsid.val[0] = (u32)id; |
646 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
647 | ||
783f6184 RK |
648 | return 0; |
649 | } | |
650 | ||
34c80b1d | 651 | static int nilfs_show_options(struct seq_file *seq, struct dentry *dentry) |
b58a285b | 652 | { |
34c80b1d | 653 | struct super_block *sb = dentry->d_sb; |
e3154e97 | 654 | struct the_nilfs *nilfs = sb->s_fs_info; |
34c80b1d | 655 | struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root; |
b58a285b | 656 | |
3b2ce58b | 657 | if (!nilfs_test_opt(nilfs, BARRIER)) |
c6b4d57d | 658 | seq_puts(seq, ",nobarrier"); |
f11459ad RK |
659 | if (root->cno != NILFS_CPTREE_CURRENT_CNO) |
660 | seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno); | |
3b2ce58b | 661 | if (nilfs_test_opt(nilfs, ERRORS_PANIC)) |
c6b4d57d | 662 | seq_puts(seq, ",errors=panic"); |
3b2ce58b | 663 | if (nilfs_test_opt(nilfs, ERRORS_CONT)) |
c6b4d57d | 664 | seq_puts(seq, ",errors=continue"); |
3b2ce58b | 665 | if (nilfs_test_opt(nilfs, STRICT_ORDER)) |
c6b4d57d | 666 | seq_puts(seq, ",order=strict"); |
3b2ce58b | 667 | if (nilfs_test_opt(nilfs, NORECOVERY)) |
c6b4d57d | 668 | seq_puts(seq, ",norecovery"); |
3b2ce58b | 669 | if (nilfs_test_opt(nilfs, DISCARD)) |
c6b4d57d | 670 | seq_puts(seq, ",discard"); |
b58a285b JS |
671 | |
672 | return 0; | |
673 | } | |
674 | ||
b87221de | 675 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
676 | .alloc_inode = nilfs_alloc_inode, |
677 | .destroy_inode = nilfs_destroy_inode, | |
678 | .dirty_inode = nilfs_dirty_inode, | |
679 | /* .write_inode = nilfs_write_inode, */ | |
680 | /* .put_inode = nilfs_put_inode, */ | |
681 | /* .drop_inode = nilfs_drop_inode, */ | |
6fd1e5c9 | 682 | .evict_inode = nilfs_evict_inode, |
783f6184 | 683 | .put_super = nilfs_put_super, |
1dfa2710 | 684 | /* .write_super = nilfs_write_super, */ |
783f6184 | 685 | .sync_fs = nilfs_sync_fs, |
5beb6e0b RK |
686 | .freeze_fs = nilfs_freeze, |
687 | .unfreeze_fs = nilfs_unfreeze, | |
783f6184 RK |
688 | /* .write_super_lockfs */ |
689 | /* .unlockfs */ | |
690 | .statfs = nilfs_statfs, | |
691 | .remount_fs = nilfs_remount, | |
783f6184 | 692 | /* .umount_begin */ |
b58a285b | 693 | .show_options = nilfs_show_options |
783f6184 RK |
694 | }; |
695 | ||
783f6184 RK |
696 | enum { |
697 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
773bc4f3 | 698 | Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
802d3177 | 699 | Opt_discard, Opt_nodiscard, Opt_err, |
783f6184 RK |
700 | }; |
701 | ||
702 | static match_table_t tokens = { | |
703 | {Opt_err_cont, "errors=continue"}, | |
704 | {Opt_err_panic, "errors=panic"}, | |
705 | {Opt_err_ro, "errors=remount-ro"}, | |
773bc4f3 | 706 | {Opt_barrier, "barrier"}, |
91f1953b | 707 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
708 | {Opt_snapshot, "cp=%u"}, |
709 | {Opt_order, "order=%s"}, | |
0234576d | 710 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 711 | {Opt_discard, "discard"}, |
802d3177 | 712 | {Opt_nodiscard, "nodiscard"}, |
783f6184 RK |
713 | {Opt_err, NULL} |
714 | }; | |
715 | ||
7c017457 | 716 | static int parse_options(char *options, struct super_block *sb, int is_remount) |
783f6184 | 717 | { |
e3154e97 | 718 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 RK |
719 | char *p; |
720 | substring_t args[MAX_OPT_ARGS]; | |
783f6184 RK |
721 | |
722 | if (!options) | |
723 | return 1; | |
724 | ||
725 | while ((p = strsep(&options, ",")) != NULL) { | |
726 | int token; | |
727 | if (!*p) | |
728 | continue; | |
729 | ||
730 | token = match_token(p, tokens, args); | |
731 | switch (token) { | |
773bc4f3 | 732 | case Opt_barrier: |
3b2ce58b | 733 | nilfs_set_opt(nilfs, BARRIER); |
773bc4f3 | 734 | break; |
91f1953b | 735 | case Opt_nobarrier: |
3b2ce58b | 736 | nilfs_clear_opt(nilfs, BARRIER); |
783f6184 RK |
737 | break; |
738 | case Opt_order: | |
739 | if (strcmp(args[0].from, "relaxed") == 0) | |
740 | /* Ordered data semantics */ | |
3b2ce58b | 741 | nilfs_clear_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
742 | else if (strcmp(args[0].from, "strict") == 0) |
743 | /* Strict in-order semantics */ | |
3b2ce58b | 744 | nilfs_set_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
745 | else |
746 | return 0; | |
747 | break; | |
748 | case Opt_err_panic: | |
3b2ce58b | 749 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC); |
783f6184 RK |
750 | break; |
751 | case Opt_err_ro: | |
3b2ce58b | 752 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO); |
783f6184 RK |
753 | break; |
754 | case Opt_err_cont: | |
3b2ce58b | 755 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT); |
783f6184 RK |
756 | break; |
757 | case Opt_snapshot: | |
7c017457 | 758 | if (is_remount) { |
f11459ad RK |
759 | printk(KERN_ERR |
760 | "NILFS: \"%s\" option is invalid " | |
761 | "for remount.\n", p); | |
783f6184 | 762 | return 0; |
7c017457 | 763 | } |
783f6184 | 764 | break; |
0234576d | 765 | case Opt_norecovery: |
3b2ce58b | 766 | nilfs_set_opt(nilfs, NORECOVERY); |
0234576d | 767 | break; |
e902ec99 | 768 | case Opt_discard: |
3b2ce58b | 769 | nilfs_set_opt(nilfs, DISCARD); |
e902ec99 | 770 | break; |
802d3177 | 771 | case Opt_nodiscard: |
3b2ce58b | 772 | nilfs_clear_opt(nilfs, DISCARD); |
802d3177 | 773 | break; |
783f6184 RK |
774 | default: |
775 | printk(KERN_ERR | |
776 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
777 | return 0; | |
778 | } | |
779 | } | |
780 | return 1; | |
781 | } | |
782 | ||
783 | static inline void | |
3b2ce58b | 784 | nilfs_set_default_options(struct super_block *sb, |
783f6184 RK |
785 | struct nilfs_super_block *sbp) |
786 | { | |
e3154e97 | 787 | struct the_nilfs *nilfs = sb->s_fs_info; |
3b2ce58b RK |
788 | |
789 | nilfs->ns_mount_opt = | |
277a6a34 | 790 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
791 | } |
792 | ||
f7545144 | 793 | static int nilfs_setup_super(struct super_block *sb, int is_mount) |
783f6184 | 794 | { |
e3154e97 | 795 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 JS |
796 | struct nilfs_super_block **sbp; |
797 | int max_mnt_count; | |
798 | int mnt_count; | |
799 | ||
800 | /* nilfs->ns_sem must be locked by the caller. */ | |
f7545144 | 801 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 JS |
802 | if (!sbp) |
803 | return -EIO; | |
804 | ||
5beb6e0b RK |
805 | if (!is_mount) |
806 | goto skip_mount_setup; | |
807 | ||
d26493b6 JS |
808 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); |
809 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); | |
783f6184 | 810 | |
f50a4c81 | 811 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
783f6184 RK |
812 | printk(KERN_WARNING |
813 | "NILFS warning: mounting fs with errors\n"); | |
814 | #if 0 | |
815 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
816 | printk(KERN_WARNING | |
817 | "NILFS warning: maximal mount count reached\n"); | |
818 | #endif | |
819 | } | |
820 | if (!max_mnt_count) | |
d26493b6 | 821 | sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
783f6184 | 822 | |
d26493b6 | 823 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
5beb6e0b RK |
824 | sbp[0]->s_mtime = cpu_to_le64(get_seconds()); |
825 | ||
826 | skip_mount_setup: | |
d26493b6 JS |
827 | sbp[0]->s_state = |
828 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); | |
b2ac86e1 | 829 | /* synchronize sbp[1] with sbp[0] */ |
0ca7a5b9 RK |
830 | if (sbp[1]) |
831 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
f7545144 | 832 | return nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); |
783f6184 RK |
833 | } |
834 | ||
e339ad31 RK |
835 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
836 | u64 pos, int blocksize, | |
837 | struct buffer_head **pbh) | |
783f6184 | 838 | { |
e339ad31 RK |
839 | unsigned long long sb_index = pos; |
840 | unsigned long offset; | |
783f6184 | 841 | |
e339ad31 | 842 | offset = do_div(sb_index, blocksize); |
783f6184 | 843 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 844 | if (!*pbh) |
783f6184 | 845 | return NULL; |
783f6184 RK |
846 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
847 | } | |
848 | ||
783f6184 RK |
849 | int nilfs_store_magic_and_option(struct super_block *sb, |
850 | struct nilfs_super_block *sbp, | |
851 | char *data) | |
852 | { | |
e3154e97 | 853 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 854 | |
783f6184 RK |
855 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
856 | ||
857 | /* FS independent flags */ | |
858 | #ifdef NILFS_ATIME_DISABLE | |
859 | sb->s_flags |= MS_NOATIME; | |
860 | #endif | |
861 | ||
3b2ce58b | 862 | nilfs_set_default_options(sb, sbp); |
783f6184 | 863 | |
574e6c31 RK |
864 | nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid); |
865 | nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid); | |
866 | nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval); | |
867 | nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max); | |
783f6184 | 868 | |
7c017457 | 869 | return !parse_options(data, sb, 0) ? -EINVAL : 0 ; |
783f6184 RK |
870 | } |
871 | ||
c5ca48aa RK |
872 | int nilfs_check_feature_compatibility(struct super_block *sb, |
873 | struct nilfs_super_block *sbp) | |
874 | { | |
875 | __u64 features; | |
876 | ||
877 | features = le64_to_cpu(sbp->s_feature_incompat) & | |
878 | ~NILFS_FEATURE_INCOMPAT_SUPP; | |
879 | if (features) { | |
880 | printk(KERN_ERR "NILFS: couldn't mount because of unsupported " | |
881 | "optional features (%llx)\n", | |
882 | (unsigned long long)features); | |
883 | return -EINVAL; | |
884 | } | |
885 | features = le64_to_cpu(sbp->s_feature_compat_ro) & | |
886 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
887 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
888 | printk(KERN_ERR "NILFS: couldn't mount RDWR because of " | |
889 | "unsupported optional features (%llx)\n", | |
890 | (unsigned long long)features); | |
891 | return -EINVAL; | |
892 | } | |
893 | return 0; | |
894 | } | |
895 | ||
367ea334 RK |
896 | static int nilfs_get_root_dentry(struct super_block *sb, |
897 | struct nilfs_root *root, | |
898 | struct dentry **root_dentry) | |
899 | { | |
900 | struct inode *inode; | |
901 | struct dentry *dentry; | |
902 | int ret = 0; | |
903 | ||
904 | inode = nilfs_iget(sb, root, NILFS_ROOT_INO); | |
905 | if (IS_ERR(inode)) { | |
906 | printk(KERN_ERR "NILFS: get root inode failed\n"); | |
907 | ret = PTR_ERR(inode); | |
908 | goto out; | |
909 | } | |
910 | if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { | |
911 | iput(inode); | |
912 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); | |
913 | ret = -EINVAL; | |
914 | goto out; | |
915 | } | |
916 | ||
f11459ad RK |
917 | if (root->cno == NILFS_CPTREE_CURRENT_CNO) { |
918 | dentry = d_find_alias(inode); | |
919 | if (!dentry) { | |
48fde701 | 920 | dentry = d_make_root(inode); |
f11459ad | 921 | if (!dentry) { |
f11459ad RK |
922 | ret = -ENOMEM; |
923 | goto failed_dentry; | |
924 | } | |
925 | } else { | |
926 | iput(inode); | |
927 | } | |
928 | } else { | |
929 | dentry = d_obtain_alias(inode); | |
930 | if (IS_ERR(dentry)) { | |
931 | ret = PTR_ERR(dentry); | |
932 | goto failed_dentry; | |
933 | } | |
367ea334 RK |
934 | } |
935 | *root_dentry = dentry; | |
936 | out: | |
937 | return ret; | |
f11459ad RK |
938 | |
939 | failed_dentry: | |
940 | printk(KERN_ERR "NILFS: get root dentry failed\n"); | |
941 | goto out; | |
367ea334 RK |
942 | } |
943 | ||
ab4d8f7e RK |
944 | static int nilfs_attach_snapshot(struct super_block *s, __u64 cno, |
945 | struct dentry **root_dentry) | |
946 | { | |
e3154e97 | 947 | struct the_nilfs *nilfs = s->s_fs_info; |
ab4d8f7e RK |
948 | struct nilfs_root *root; |
949 | int ret; | |
950 | ||
951 | down_read(&nilfs->ns_segctor_sem); | |
952 | ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno); | |
953 | up_read(&nilfs->ns_segctor_sem); | |
954 | if (ret < 0) { | |
955 | ret = (ret == -ENOENT) ? -EINVAL : ret; | |
956 | goto out; | |
957 | } else if (!ret) { | |
958 | printk(KERN_ERR "NILFS: The specified checkpoint is " | |
959 | "not a snapshot (checkpoint number=%llu).\n", | |
960 | (unsigned long long)cno); | |
961 | ret = -EINVAL; | |
962 | goto out; | |
963 | } | |
964 | ||
f7545144 | 965 | ret = nilfs_attach_checkpoint(s, cno, false, &root); |
ab4d8f7e RK |
966 | if (ret) { |
967 | printk(KERN_ERR "NILFS: error loading snapshot " | |
968 | "(checkpoint number=%llu).\n", | |
969 | (unsigned long long)cno); | |
970 | goto out; | |
971 | } | |
972 | ret = nilfs_get_root_dentry(s, root, root_dentry); | |
973 | nilfs_put_root(root); | |
974 | out: | |
975 | return ret; | |
976 | } | |
977 | ||
f11459ad RK |
978 | static int nilfs_tree_was_touched(struct dentry *root_dentry) |
979 | { | |
b7ab39f6 | 980 | return root_dentry->d_count > 1; |
f11459ad RK |
981 | } |
982 | ||
983 | /** | |
984 | * nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint | |
985 | * @root_dentry: root dentry of the tree to be shrunk | |
986 | * | |
987 | * This function returns true if the tree was in-use. | |
988 | */ | |
989 | static int nilfs_try_to_shrink_tree(struct dentry *root_dentry) | |
990 | { | |
991 | if (have_submounts(root_dentry)) | |
992 | return true; | |
993 | shrink_dcache_parent(root_dentry); | |
994 | return nilfs_tree_was_touched(root_dentry); | |
995 | } | |
996 | ||
032dbb3b RK |
997 | int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno) |
998 | { | |
e3154e97 | 999 | struct the_nilfs *nilfs = sb->s_fs_info; |
032dbb3b RK |
1000 | struct nilfs_root *root; |
1001 | struct inode *inode; | |
1002 | struct dentry *dentry; | |
1003 | int ret; | |
1004 | ||
1005 | if (cno < 0 || cno > nilfs->ns_cno) | |
1006 | return false; | |
1007 | ||
1008 | if (cno >= nilfs_last_cno(nilfs)) | |
1009 | return true; /* protect recent checkpoints */ | |
1010 | ||
1011 | ret = false; | |
e3154e97 | 1012 | root = nilfs_lookup_root(nilfs, cno); |
032dbb3b RK |
1013 | if (root) { |
1014 | inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO); | |
1015 | if (inode) { | |
1016 | dentry = d_find_alias(inode); | |
1017 | if (dentry) { | |
1018 | if (nilfs_tree_was_touched(dentry)) | |
1019 | ret = nilfs_try_to_shrink_tree(dentry); | |
1020 | dput(dentry); | |
1021 | } | |
1022 | iput(inode); | |
1023 | } | |
1024 | nilfs_put_root(root); | |
1025 | } | |
1026 | return ret; | |
1027 | } | |
1028 | ||
783f6184 RK |
1029 | /** |
1030 | * nilfs_fill_super() - initialize a super block instance | |
1031 | * @sb: super_block | |
1032 | * @data: mount options | |
1033 | * @silent: silent mode flag | |
783f6184 | 1034 | * |
aa7dfb89 | 1035 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
1036 | * So, the recovery process is protected from other simultaneous mounts. |
1037 | */ | |
1038 | static int | |
348fe8da | 1039 | nilfs_fill_super(struct super_block *sb, void *data, int silent) |
783f6184 | 1040 | { |
348fe8da | 1041 | struct the_nilfs *nilfs; |
4d8d9293 | 1042 | struct nilfs_root *fsroot; |
026a7d63 | 1043 | struct backing_dev_info *bdi; |
783f6184 RK |
1044 | __u64 cno; |
1045 | int err; | |
1046 | ||
e3154e97 RK |
1047 | nilfs = alloc_nilfs(sb->s_bdev); |
1048 | if (!nilfs) | |
783f6184 RK |
1049 | return -ENOMEM; |
1050 | ||
e3154e97 | 1051 | sb->s_fs_info = nilfs; |
783f6184 | 1052 | |
f7545144 | 1053 | err = init_nilfs(nilfs, sb, (char *)data); |
783f6184 | 1054 | if (err) |
348fe8da | 1055 | goto failed_nilfs; |
783f6184 | 1056 | |
783f6184 RK |
1057 | sb->s_op = &nilfs_sops; |
1058 | sb->s_export_op = &nilfs_export_ops; | |
1059 | sb->s_root = NULL; | |
61239230 | 1060 | sb->s_time_gran = 1; |
8de52778 | 1061 | sb->s_max_links = NILFS_LINK_MAX; |
026a7d63 RK |
1062 | |
1063 | bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info; | |
1064 | sb->s_bdi = bdi ? : &default_backing_dev_info; | |
783f6184 | 1065 | |
f7545144 | 1066 | err = load_nilfs(nilfs, sb); |
f50a4c81 | 1067 | if (err) |
348fe8da | 1068 | goto failed_nilfs; |
f50a4c81 | 1069 | |
783f6184 | 1070 | cno = nilfs_last_cno(nilfs); |
f7545144 | 1071 | err = nilfs_attach_checkpoint(sb, cno, true, &fsroot); |
783f6184 | 1072 | if (err) { |
f11459ad RK |
1073 | printk(KERN_ERR "NILFS: error loading last checkpoint " |
1074 | "(checkpoint number=%llu).\n", (unsigned long long)cno); | |
f1e89c86 | 1075 | goto failed_unload; |
783f6184 RK |
1076 | } |
1077 | ||
1078 | if (!(sb->s_flags & MS_RDONLY)) { | |
f7545144 | 1079 | err = nilfs_attach_log_writer(sb, fsroot); |
783f6184 RK |
1080 | if (err) |
1081 | goto failed_checkpoint; | |
1082 | } | |
1083 | ||
367ea334 RK |
1084 | err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root); |
1085 | if (err) | |
783f6184 | 1086 | goto failed_segctor; |
783f6184 | 1087 | |
4d8d9293 | 1088 | nilfs_put_root(fsroot); |
783f6184 RK |
1089 | |
1090 | if (!(sb->s_flags & MS_RDONLY)) { | |
1091 | down_write(&nilfs->ns_sem); | |
f7545144 | 1092 | nilfs_setup_super(sb, true); |
783f6184 RK |
1093 | up_write(&nilfs->ns_sem); |
1094 | } | |
1095 | ||
783f6184 RK |
1096 | return 0; |
1097 | ||
783f6184 | 1098 | failed_segctor: |
f7545144 | 1099 | nilfs_detach_log_writer(sb); |
783f6184 RK |
1100 | |
1101 | failed_checkpoint: | |
4d8d9293 | 1102 | nilfs_put_root(fsroot); |
783f6184 | 1103 | |
f1e89c86 RK |
1104 | failed_unload: |
1105 | iput(nilfs->ns_sufile); | |
1106 | iput(nilfs->ns_cpfile); | |
1107 | iput(nilfs->ns_dat); | |
1108 | ||
348fe8da RK |
1109 | failed_nilfs: |
1110 | destroy_nilfs(nilfs); | |
783f6184 RK |
1111 | return err; |
1112 | } | |
1113 | ||
1114 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
1115 | { | |
e3154e97 | 1116 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 1117 | unsigned long old_sb_flags; |
06df0f99 | 1118 | unsigned long old_mount_opt; |
f11459ad | 1119 | int err; |
783f6184 RK |
1120 | |
1121 | old_sb_flags = sb->s_flags; | |
3b2ce58b | 1122 | old_mount_opt = nilfs->ns_mount_opt; |
783f6184 | 1123 | |
7c017457 | 1124 | if (!parse_options(data, sb, 1)) { |
783f6184 RK |
1125 | err = -EINVAL; |
1126 | goto restore_opts; | |
1127 | } | |
1128 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); | |
1129 | ||
d240e067 | 1130 | err = -EINVAL; |
783f6184 | 1131 | |
0234576d RK |
1132 | if (!nilfs_valid_fs(nilfs)) { |
1133 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1134 | "remount because the filesystem is in an " | |
1135 | "incomplete recovery state.\n", sb->s_id); | |
0234576d RK |
1136 | goto restore_opts; |
1137 | } | |
1138 | ||
783f6184 RK |
1139 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
1140 | goto out; | |
1141 | if (*flags & MS_RDONLY) { | |
f7545144 RK |
1142 | /* Shutting down log writer */ |
1143 | nilfs_detach_log_writer(sb); | |
783f6184 RK |
1144 | sb->s_flags |= MS_RDONLY; |
1145 | ||
783f6184 RK |
1146 | /* |
1147 | * Remounting a valid RW partition RDONLY, so set | |
1148 | * the RDONLY flag and then mark the partition as valid again. | |
1149 | */ | |
1150 | down_write(&nilfs->ns_sem); | |
f7545144 | 1151 | nilfs_cleanup_super(sb); |
783f6184 RK |
1152 | up_write(&nilfs->ns_sem); |
1153 | } else { | |
c5ca48aa | 1154 | __u64 features; |
e912a5b6 | 1155 | struct nilfs_root *root; |
c5ca48aa | 1156 | |
783f6184 RK |
1157 | /* |
1158 | * Mounting a RDONLY partition read-write, so reread and | |
1159 | * store the current valid flag. (It may have been changed | |
1160 | * by fsck since we originally mounted the partition.) | |
1161 | */ | |
c5ca48aa RK |
1162 | down_read(&nilfs->ns_sem); |
1163 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & | |
1164 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
1165 | up_read(&nilfs->ns_sem); | |
1166 | if (features) { | |
1167 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1168 | "remount RDWR because of unsupported optional " | |
1169 | "features (%llx)\n", | |
1170 | sb->s_id, (unsigned long long)features); | |
1171 | err = -EROFS; | |
1172 | goto restore_opts; | |
1173 | } | |
1174 | ||
783f6184 | 1175 | sb->s_flags &= ~MS_RDONLY; |
783f6184 | 1176 | |
e912a5b6 | 1177 | root = NILFS_I(sb->s_root->d_inode)->i_root; |
f7545144 | 1178 | err = nilfs_attach_log_writer(sb, root); |
783f6184 | 1179 | if (err) |
e59399d0 | 1180 | goto restore_opts; |
783f6184 RK |
1181 | |
1182 | down_write(&nilfs->ns_sem); | |
f7545144 | 1183 | nilfs_setup_super(sb, true); |
783f6184 | 1184 | up_write(&nilfs->ns_sem); |
783f6184 RK |
1185 | } |
1186 | out: | |
1187 | return 0; | |
1188 | ||
783f6184 RK |
1189 | restore_opts: |
1190 | sb->s_flags = old_sb_flags; | |
3b2ce58b | 1191 | nilfs->ns_mount_opt = old_mount_opt; |
783f6184 RK |
1192 | return err; |
1193 | } | |
1194 | ||
1195 | struct nilfs_super_data { | |
1196 | struct block_device *bdev; | |
1197 | __u64 cno; | |
1198 | int flags; | |
1199 | }; | |
1200 | ||
1201 | /** | |
1202 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
1203 | * @data: mount options | |
1204 | * @sd: nilfs_super_data | |
1205 | */ | |
1206 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
1207 | { | |
1208 | char *p, *options = data; | |
1209 | substring_t args[MAX_OPT_ARGS]; | |
c05dbfc2 | 1210 | int token; |
783f6184 RK |
1211 | int ret = 0; |
1212 | ||
1213 | do { | |
1214 | p = strsep(&options, ","); | |
1215 | if (p != NULL && *p) { | |
1216 | token = match_token(p, tokens, args); | |
1217 | if (token == Opt_snapshot) { | |
c05dbfc2 | 1218 | if (!(sd->flags & MS_RDONLY)) { |
783f6184 | 1219 | ret++; |
c05dbfc2 RK |
1220 | } else { |
1221 | sd->cno = simple_strtoull(args[0].from, | |
1222 | NULL, 0); | |
1223 | /* | |
1224 | * No need to see the end pointer; | |
1225 | * match_token() has done syntax | |
1226 | * checking. | |
1227 | */ | |
1228 | if (sd->cno == 0) | |
1229 | ret++; | |
783f6184 RK |
1230 | } |
1231 | } | |
1232 | if (ret) | |
1233 | printk(KERN_ERR | |
1234 | "NILFS: invalid mount option: %s\n", p); | |
1235 | } | |
1236 | if (!options) | |
1237 | break; | |
1238 | BUG_ON(options == data); | |
1239 | *(options - 1) = ','; | |
1240 | } while (!ret); | |
1241 | return ret; | |
1242 | } | |
1243 | ||
1244 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1245 | { | |
f11459ad | 1246 | s->s_bdev = data; |
783f6184 RK |
1247 | s->s_dev = s->s_bdev->bd_dev; |
1248 | return 0; | |
1249 | } | |
1250 | ||
1251 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 | 1252 | { |
f11459ad | 1253 | return (void *)s->s_bdev == data; |
783f6184 RK |
1254 | } |
1255 | ||
e4c59d61 AV |
1256 | static struct dentry * |
1257 | nilfs_mount(struct file_system_type *fs_type, int flags, | |
1258 | const char *dev_name, void *data) | |
783f6184 RK |
1259 | { |
1260 | struct nilfs_super_data sd; | |
33c8e57c | 1261 | struct super_block *s; |
d4d77629 | 1262 | fmode_t mode = FMODE_READ | FMODE_EXCL; |
f11459ad RK |
1263 | struct dentry *root_dentry; |
1264 | int err, s_new = false; | |
783f6184 | 1265 | |
13e90559 RK |
1266 | if (!(flags & MS_RDONLY)) |
1267 | mode |= FMODE_WRITE; | |
1268 | ||
d4d77629 | 1269 | sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type); |
d6d4c19c | 1270 | if (IS_ERR(sd.bdev)) |
e4c59d61 | 1271 | return ERR_CAST(sd.bdev); |
783f6184 | 1272 | |
783f6184 RK |
1273 | sd.cno = 0; |
1274 | sd.flags = flags; | |
1275 | if (nilfs_identify((char *)data, &sd)) { | |
1276 | err = -EINVAL; | |
1277 | goto failed; | |
1278 | } | |
1279 | ||
6dd47406 | 1280 | /* |
5beb6e0b RK |
1281 | * once the super is inserted into the list by sget, s_umount |
1282 | * will protect the lockfs code from trying to start a snapshot | |
1283 | * while we are mounting | |
6dd47406 | 1284 | */ |
5beb6e0b RK |
1285 | mutex_lock(&sd.bdev->bd_fsfreeze_mutex); |
1286 | if (sd.bdev->bd_fsfreeze_count > 0) { | |
1287 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); | |
1288 | err = -EBUSY; | |
1289 | goto failed; | |
1290 | } | |
f11459ad | 1291 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev); |
5beb6e0b | 1292 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); |
33c8e57c RK |
1293 | if (IS_ERR(s)) { |
1294 | err = PTR_ERR(s); | |
348fe8da | 1295 | goto failed; |
783f6184 RK |
1296 | } |
1297 | ||
1298 | if (!s->s_root) { | |
1299 | char b[BDEVNAME_SIZE]; | |
1300 | ||
f11459ad RK |
1301 | s_new = true; |
1302 | ||
33c8e57c | 1303 | /* New superblock instance created */ |
783f6184 | 1304 | s->s_flags = flags; |
4571b82c | 1305 | s->s_mode = mode; |
783f6184 RK |
1306 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); |
1307 | sb_set_blocksize(s, block_size(sd.bdev)); | |
1308 | ||
348fe8da | 1309 | err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
783f6184 | 1310 | if (err) |
348fe8da | 1311 | goto failed_super; |
783f6184 RK |
1312 | |
1313 | s->s_flags |= MS_ACTIVE; | |
f11459ad RK |
1314 | } else if (!sd.cno) { |
1315 | int busy = false; | |
1316 | ||
1317 | if (nilfs_tree_was_touched(s->s_root)) { | |
1318 | busy = nilfs_try_to_shrink_tree(s->s_root); | |
1319 | if (busy && (flags ^ s->s_flags) & MS_RDONLY) { | |
1320 | printk(KERN_ERR "NILFS: the device already " | |
1321 | "has a %s mount.\n", | |
1322 | (s->s_flags & MS_RDONLY) ? | |
1323 | "read-only" : "read/write"); | |
1324 | err = -EBUSY; | |
1325 | goto failed_super; | |
1326 | } | |
1327 | } | |
1328 | if (!busy) { | |
1329 | /* | |
1330 | * Try remount to setup mount states if the current | |
1331 | * tree is not mounted and only snapshots use this sb. | |
1332 | */ | |
1333 | err = nilfs_remount(s, &flags, data); | |
1334 | if (err) | |
1335 | goto failed_super; | |
1336 | } | |
783f6184 RK |
1337 | } |
1338 | ||
f11459ad RK |
1339 | if (sd.cno) { |
1340 | err = nilfs_attach_snapshot(s, sd.cno, &root_dentry); | |
348fe8da | 1341 | if (err) |
f11459ad | 1342 | goto failed_super; |
f11459ad RK |
1343 | } else { |
1344 | root_dentry = dget(s->s_root); | |
783f6184 RK |
1345 | } |
1346 | ||
f11459ad | 1347 | if (!s_new) |
d4d77629 | 1348 | blkdev_put(sd.bdev, mode); |
783f6184 | 1349 | |
e4c59d61 | 1350 | return root_dentry; |
783f6184 | 1351 | |
f11459ad | 1352 | failed_super: |
a95161aa | 1353 | deactivate_locked_super(s); |
783f6184 | 1354 | |
348fe8da RK |
1355 | failed: |
1356 | if (!s_new) | |
d4d77629 | 1357 | blkdev_put(sd.bdev, mode); |
e4c59d61 | 1358 | return ERR_PTR(err); |
783f6184 RK |
1359 | } |
1360 | ||
783f6184 RK |
1361 | struct file_system_type nilfs_fs_type = { |
1362 | .owner = THIS_MODULE, | |
1363 | .name = "nilfs2", | |
e4c59d61 | 1364 | .mount = nilfs_mount, |
783f6184 RK |
1365 | .kill_sb = kill_block_super, |
1366 | .fs_flags = FS_REQUIRES_DEV, | |
1367 | }; | |
1368 | ||
41c88bd7 | 1369 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1370 | { |
41c88bd7 | 1371 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1372 | |
41c88bd7 LH |
1373 | INIT_LIST_HEAD(&ii->i_dirty); |
1374 | #ifdef CONFIG_NILFS_XATTR | |
1375 | init_rwsem(&ii->xattr_sem); | |
1376 | #endif | |
2aa15890 | 1377 | address_space_init_once(&ii->i_btnode_cache); |
05d0e94b | 1378 | ii->i_bmap = &ii->i_bmap_data; |
41c88bd7 LH |
1379 | inode_init_once(&ii->vfs_inode); |
1380 | } | |
783f6184 | 1381 | |
41c88bd7 LH |
1382 | static void nilfs_segbuf_init_once(void *obj) |
1383 | { | |
1384 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1385 | } | |
783f6184 | 1386 | |
41c88bd7 LH |
1387 | static void nilfs_destroy_cachep(void) |
1388 | { | |
84cb0999 | 1389 | if (nilfs_inode_cachep) |
41c88bd7 | 1390 | kmem_cache_destroy(nilfs_inode_cachep); |
84cb0999 | 1391 | if (nilfs_transaction_cachep) |
41c88bd7 | 1392 | kmem_cache_destroy(nilfs_transaction_cachep); |
84cb0999 | 1393 | if (nilfs_segbuf_cachep) |
41c88bd7 | 1394 | kmem_cache_destroy(nilfs_segbuf_cachep); |
84cb0999 | 1395 | if (nilfs_btree_path_cache) |
41c88bd7 LH |
1396 | kmem_cache_destroy(nilfs_btree_path_cache); |
1397 | } | |
783f6184 | 1398 | |
41c88bd7 LH |
1399 | static int __init nilfs_init_cachep(void) |
1400 | { | |
1401 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1402 | sizeof(struct nilfs_inode_info), 0, | |
1403 | SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once); | |
1404 | if (!nilfs_inode_cachep) | |
1405 | goto fail; | |
1406 | ||
1407 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1408 | sizeof(struct nilfs_transaction_info), 0, | |
1409 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1410 | if (!nilfs_transaction_cachep) | |
1411 | goto fail; | |
1412 | ||
1413 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1414 | sizeof(struct nilfs_segment_buffer), 0, | |
1415 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1416 | if (!nilfs_segbuf_cachep) | |
1417 | goto fail; | |
1418 | ||
1419 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1420 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1421 | 0, 0, NULL); | |
1422 | if (!nilfs_btree_path_cache) | |
1423 | goto fail; | |
783f6184 RK |
1424 | |
1425 | return 0; | |
1426 | ||
41c88bd7 LH |
1427 | fail: |
1428 | nilfs_destroy_cachep(); | |
1429 | return -ENOMEM; | |
1430 | } | |
1431 | ||
1432 | static int __init init_nilfs_fs(void) | |
1433 | { | |
1434 | int err; | |
783f6184 | 1435 | |
41c88bd7 LH |
1436 | err = nilfs_init_cachep(); |
1437 | if (err) | |
1438 | goto fail; | |
783f6184 | 1439 | |
41c88bd7 LH |
1440 | err = register_filesystem(&nilfs_fs_type); |
1441 | if (err) | |
1442 | goto free_cachep; | |
783f6184 | 1443 | |
9f130263 | 1444 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1445 | return 0; |
783f6184 | 1446 | |
41c88bd7 LH |
1447 | free_cachep: |
1448 | nilfs_destroy_cachep(); | |
1449 | fail: | |
783f6184 RK |
1450 | return err; |
1451 | } | |
1452 | ||
1453 | static void __exit exit_nilfs_fs(void) | |
1454 | { | |
41c88bd7 | 1455 | nilfs_destroy_cachep(); |
783f6184 RK |
1456 | unregister_filesystem(&nilfs_fs_type); |
1457 | } | |
1458 | ||
1459 | module_init(init_nilfs_fs) | |
1460 | module_exit(exit_nilfs_fs) |