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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 | * | |
4b420ab4 | 16 | * Written by Ryusuke Konishi. |
783f6184 RK |
17 | */ |
18 | /* | |
19 | * linux/fs/ext2/super.c | |
20 | * | |
21 | * Copyright (C) 1992, 1993, 1994, 1995 | |
22 | * Remy Card (card@masi.ibp.fr) | |
23 | * Laboratoire MASI - Institut Blaise Pascal | |
24 | * Universite Pierre et Marie Curie (Paris VI) | |
25 | * | |
26 | * from | |
27 | * | |
28 | * linux/fs/minix/inode.c | |
29 | * | |
30 | * Copyright (C) 1991, 1992 Linus Torvalds | |
31 | * | |
32 | * Big-endian to little-endian byte-swapping/bitmaps by | |
33 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
34 | */ | |
35 | ||
36 | #include <linux/module.h> | |
37 | #include <linux/string.h> | |
38 | #include <linux/slab.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/blkdev.h> | |
41 | #include <linux/parser.h> | |
783f6184 | 42 | #include <linux/crc32.h> |
783f6184 RK |
43 | #include <linux/vfs.h> |
44 | #include <linux/writeback.h> | |
b58a285b JS |
45 | #include <linux/seq_file.h> |
46 | #include <linux/mount.h> | |
783f6184 | 47 | #include "nilfs.h" |
8e656fd5 | 48 | #include "export.h" |
783f6184 RK |
49 | #include "mdt.h" |
50 | #include "alloc.h" | |
05d0e94b RK |
51 | #include "btree.h" |
52 | #include "btnode.h" | |
783f6184 RK |
53 | #include "page.h" |
54 | #include "cpfile.h" | |
4e33f9ea | 55 | #include "sufile.h" /* nilfs_sufile_resize(), nilfs_sufile_set_alloc_range() */ |
783f6184 RK |
56 | #include "ifile.h" |
57 | #include "dat.h" | |
58 | #include "segment.h" | |
59 | #include "segbuf.h" | |
60 | ||
61 | MODULE_AUTHOR("NTT Corp."); | |
62 | MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem " | |
63 | "(NILFS)"); | |
783f6184 RK |
64 | MODULE_LICENSE("GPL"); |
65 | ||
abc0b50b | 66 | static struct kmem_cache *nilfs_inode_cachep; |
41c88bd7 LH |
67 | struct kmem_cache *nilfs_transaction_cachep; |
68 | struct kmem_cache *nilfs_segbuf_cachep; | |
69 | struct kmem_cache *nilfs_btree_path_cache; | |
70 | ||
f7545144 | 71 | static int nilfs_setup_super(struct super_block *sb, int is_mount); |
783f6184 | 72 | static int nilfs_remount(struct super_block *sb, int *flags, char *data); |
783f6184 | 73 | |
a66dfb0a RK |
74 | void __nilfs_msg(struct super_block *sb, const char *level, const char *fmt, |
75 | ...) | |
76 | { | |
77 | struct va_format vaf; | |
78 | va_list args; | |
79 | ||
80 | va_start(args, fmt); | |
81 | vaf.fmt = fmt; | |
82 | vaf.va = &args; | |
83 | if (sb) | |
84 | printk("%sNILFS (%s): %pV\n", level, sb->s_id, &vaf); | |
85 | else | |
86 | printk("%sNILFS: %pV\n", level, &vaf); | |
87 | va_end(args); | |
88 | } | |
89 | ||
f7545144 | 90 | static void nilfs_set_error(struct super_block *sb) |
c8a11c8a | 91 | { |
e3154e97 | 92 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 93 | struct nilfs_super_block **sbp; |
c8a11c8a RK |
94 | |
95 | down_write(&nilfs->ns_sem); | |
96 | if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { | |
97 | nilfs->ns_mount_state |= NILFS_ERROR_FS; | |
f7545144 | 98 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 JS |
99 | if (likely(sbp)) { |
100 | sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
b2ac86e1 JS |
101 | if (sbp[1]) |
102 | sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
f7545144 | 103 | nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); |
d26493b6 | 104 | } |
c8a11c8a RK |
105 | } |
106 | up_write(&nilfs->ns_sem); | |
107 | } | |
108 | ||
783f6184 | 109 | /** |
cae3d4ca | 110 | * __nilfs_error() - report failure condition on a filesystem |
783f6184 | 111 | * |
cae3d4ca RK |
112 | * __nilfs_error() sets an ERROR_FS flag on the superblock as well as |
113 | * reporting an error message. This function should be called when | |
114 | * NILFS detects incoherences or defects of meta data on disk. | |
783f6184 | 115 | * |
cae3d4ca RK |
116 | * This implements the body of nilfs_error() macro. Normally, |
117 | * nilfs_error() should be used. As for sustainable errors such as a | |
118 | * single-shot I/O error, nilfs_warning() or printk() should be used | |
119 | * instead. | |
120 | * | |
121 | * Callers should not add a trailing newline since this will do it. | |
783f6184 | 122 | */ |
cae3d4ca RK |
123 | void __nilfs_error(struct super_block *sb, const char *function, |
124 | const char *fmt, ...) | |
783f6184 | 125 | { |
e3154e97 | 126 | struct the_nilfs *nilfs = sb->s_fs_info; |
b004a5eb | 127 | struct va_format vaf; |
783f6184 RK |
128 | va_list args; |
129 | ||
130 | va_start(args, fmt); | |
b004a5eb JP |
131 | |
132 | vaf.fmt = fmt; | |
133 | vaf.va = &args; | |
134 | ||
135 | printk(KERN_CRIT "NILFS error (device %s): %s: %pV\n", | |
136 | sb->s_id, function, &vaf); | |
137 | ||
783f6184 RK |
138 | va_end(args); |
139 | ||
140 | if (!(sb->s_flags & MS_RDONLY)) { | |
f7545144 | 141 | nilfs_set_error(sb); |
783f6184 | 142 | |
3b2ce58b | 143 | if (nilfs_test_opt(nilfs, ERRORS_RO)) { |
783f6184 RK |
144 | printk(KERN_CRIT "Remounting filesystem read-only\n"); |
145 | sb->s_flags |= MS_RDONLY; | |
146 | } | |
147 | } | |
148 | ||
3b2ce58b | 149 | if (nilfs_test_opt(nilfs, ERRORS_PANIC)) |
783f6184 RK |
150 | panic("NILFS (device %s): panic forced after error\n", |
151 | sb->s_id); | |
152 | } | |
153 | ||
154 | void nilfs_warning(struct super_block *sb, const char *function, | |
155 | const char *fmt, ...) | |
156 | { | |
b004a5eb | 157 | struct va_format vaf; |
783f6184 RK |
158 | va_list args; |
159 | ||
160 | va_start(args, fmt); | |
b004a5eb JP |
161 | |
162 | vaf.fmt = fmt; | |
163 | vaf.va = &args; | |
164 | ||
165 | printk(KERN_WARNING "NILFS warning (device %s): %s: %pV\n", | |
166 | sb->s_id, function, &vaf); | |
167 | ||
783f6184 RK |
168 | va_end(args); |
169 | } | |
170 | ||
783f6184 | 171 | |
2879ed66 | 172 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
783f6184 RK |
173 | { |
174 | struct nilfs_inode_info *ii; | |
175 | ||
176 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); | |
177 | if (!ii) | |
178 | return NULL; | |
179 | ii->i_bh = NULL; | |
180 | ii->i_state = 0; | |
0e14a359 | 181 | ii->i_cno = 0; |
783f6184 | 182 | ii->vfs_inode.i_version = 1; |
b83ae6d4 | 183 | nilfs_mapping_init(&ii->i_btnode_cache, &ii->vfs_inode); |
783f6184 RK |
184 | return &ii->vfs_inode; |
185 | } | |
186 | ||
fa0d7e3d | 187 | static void nilfs_i_callback(struct rcu_head *head) |
783f6184 | 188 | { |
fa0d7e3d | 189 | struct inode *inode = container_of(head, struct inode, i_rcu); |
b91c9a97 | 190 | |
2d19961d RK |
191 | if (nilfs_is_metadata_file_inode(inode)) |
192 | nilfs_mdt_destroy(inode); | |
193 | ||
783f6184 RK |
194 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
195 | } | |
196 | ||
fa0d7e3d NP |
197 | void nilfs_destroy_inode(struct inode *inode) |
198 | { | |
199 | call_rcu(&inode->i_rcu, nilfs_i_callback); | |
200 | } | |
201 | ||
f7545144 | 202 | static int nilfs_sync_super(struct super_block *sb, int flag) |
783f6184 | 203 | { |
e3154e97 | 204 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 205 | int err; |
783f6184 | 206 | |
783f6184 | 207 | retry: |
e339ad31 | 208 | set_buffer_dirty(nilfs->ns_sbh[0]); |
3b2ce58b | 209 | if (nilfs_test_opt(nilfs, BARRIER)) { |
87e99511 | 210 | err = __sync_dirty_buffer(nilfs->ns_sbh[0], |
f8c131f5 | 211 | WRITE_SYNC | WRITE_FLUSH_FUA); |
87e99511 CH |
212 | } else { |
213 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); | |
783f6184 | 214 | } |
87e99511 | 215 | |
e339ad31 | 216 | if (unlikely(err)) { |
783f6184 RK |
217 | printk(KERN_ERR |
218 | "NILFS: unable to write superblock (err=%d)\n", err); | |
e339ad31 | 219 | if (err == -EIO && nilfs->ns_sbh[1]) { |
b2ac86e1 JS |
220 | /* |
221 | * sbp[0] points to newer log than sbp[1], | |
222 | * so copy sbp[0] to sbp[1] to take over sbp[0]. | |
223 | */ | |
224 | memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0], | |
225 | nilfs->ns_sbsize); | |
e339ad31 RK |
226 | nilfs_fall_back_super_block(nilfs); |
227 | goto retry; | |
228 | } | |
229 | } else { | |
230 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; | |
231 | ||
b2ac86e1 JS |
232 | nilfs->ns_sbwcount++; |
233 | ||
e339ad31 RK |
234 | /* |
235 | * The latest segment becomes trailable from the position | |
236 | * written in superblock. | |
237 | */ | |
783f6184 | 238 | clear_nilfs_discontinued(nilfs); |
e339ad31 RK |
239 | |
240 | /* update GC protection for recent segments */ | |
241 | if (nilfs->ns_sbh[1]) { | |
b2ac86e1 | 242 | if (flag == NILFS_SB_COMMIT_ALL) { |
e339ad31 | 243 | set_buffer_dirty(nilfs->ns_sbh[1]); |
b2ac86e1 JS |
244 | if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0) |
245 | goto out; | |
e339ad31 | 246 | } |
b2ac86e1 JS |
247 | if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) < |
248 | le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno)) | |
249 | sbp = nilfs->ns_sbp[1]; | |
e339ad31 | 250 | } |
783f6184 | 251 | |
b2ac86e1 JS |
252 | spin_lock(&nilfs->ns_last_segment_lock); |
253 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); | |
254 | spin_unlock(&nilfs->ns_last_segment_lock); | |
255 | } | |
256 | out: | |
783f6184 RK |
257 | return err; |
258 | } | |
259 | ||
60f46b7e RK |
260 | void nilfs_set_log_cursor(struct nilfs_super_block *sbp, |
261 | struct the_nilfs *nilfs) | |
262 | { | |
263 | sector_t nfreeblocks; | |
264 | ||
265 | /* nilfs->ns_sem must be locked by the caller. */ | |
266 | nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
267 | sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
268 | ||
269 | spin_lock(&nilfs->ns_last_segment_lock); | |
270 | sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
271 | sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
272 | sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
273 | spin_unlock(&nilfs->ns_last_segment_lock); | |
274 | } | |
275 | ||
f7545144 | 276 | struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb, |
b2ac86e1 | 277 | int flip) |
783f6184 | 278 | { |
e3154e97 | 279 | struct the_nilfs *nilfs = sb->s_fs_info; |
e339ad31 | 280 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 281 | |
d26493b6 | 282 | /* nilfs->ns_sem must be locked by the caller. */ |
34cb9b5c | 283 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
d26493b6 JS |
284 | if (sbp[1] && |
285 | sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
b2ac86e1 | 286 | memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); |
d26493b6 | 287 | } else { |
e339ad31 | 288 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", |
f7545144 | 289 | sb->s_id); |
d26493b6 | 290 | return NULL; |
e339ad31 | 291 | } |
b2ac86e1 JS |
292 | } else if (sbp[1] && |
293 | sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
7592ecde | 294 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); |
e339ad31 | 295 | } |
b2ac86e1 JS |
296 | |
297 | if (flip && sbp[1]) | |
298 | nilfs_swap_super_block(nilfs); | |
299 | ||
d26493b6 JS |
300 | return sbp; |
301 | } | |
302 | ||
f7545144 | 303 | int nilfs_commit_super(struct super_block *sb, int flag) |
d26493b6 | 304 | { |
e3154e97 | 305 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 JS |
306 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
307 | time_t t; | |
308 | ||
309 | /* nilfs->ns_sem must be locked by the caller. */ | |
e339ad31 | 310 | t = get_seconds(); |
b2ac86e1 | 311 | nilfs->ns_sbwtime = t; |
e339ad31 RK |
312 | sbp[0]->s_wtime = cpu_to_le64(t); |
313 | sbp[0]->s_sum = 0; | |
314 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
315 | (unsigned char *)sbp[0], | |
316 | nilfs->ns_sbsize)); | |
b2ac86e1 JS |
317 | if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) { |
318 | sbp[1]->s_wtime = sbp[0]->s_wtime; | |
319 | sbp[1]->s_sum = 0; | |
320 | sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
321 | (unsigned char *)sbp[1], | |
322 | nilfs->ns_sbsize)); | |
e339ad31 | 323 | } |
e605f0a7 | 324 | clear_nilfs_sb_dirty(nilfs); |
e2c7617a AR |
325 | nilfs->ns_flushed_device = 1; |
326 | /* make sure store to ns_flushed_device cannot be reordered */ | |
327 | smp_wmb(); | |
f7545144 | 328 | return nilfs_sync_super(sb, flag); |
783f6184 RK |
329 | } |
330 | ||
7ecaa46c RK |
331 | /** |
332 | * nilfs_cleanup_super() - write filesystem state for cleanup | |
f7545144 | 333 | * @sb: super block instance to be unmounted or degraded to read-only |
7ecaa46c RK |
334 | * |
335 | * This function restores state flags in the on-disk super block. | |
336 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the | |
337 | * filesystem was not clean previously. | |
338 | */ | |
f7545144 | 339 | int nilfs_cleanup_super(struct super_block *sb) |
7ecaa46c | 340 | { |
e3154e97 | 341 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 342 | struct nilfs_super_block **sbp; |
b2ac86e1 | 343 | int flag = NILFS_SB_COMMIT; |
d26493b6 | 344 | int ret = -EIO; |
7ecaa46c | 345 | |
f7545144 | 346 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 | 347 | if (sbp) { |
f7545144 RK |
348 | sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state); |
349 | nilfs_set_log_cursor(sbp[0], nilfs); | |
b2ac86e1 JS |
350 | if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { |
351 | /* | |
352 | * make the "clean" flag also to the opposite | |
353 | * super block if both super blocks point to | |
354 | * the same checkpoint. | |
355 | */ | |
356 | sbp[1]->s_state = sbp[0]->s_state; | |
357 | flag = NILFS_SB_COMMIT_ALL; | |
358 | } | |
f7545144 | 359 | ret = nilfs_commit_super(sb, flag); |
d26493b6 | 360 | } |
7ecaa46c RK |
361 | return ret; |
362 | } | |
363 | ||
cfb0a4bf RK |
364 | /** |
365 | * nilfs_move_2nd_super - relocate secondary super block | |
366 | * @sb: super block instance | |
367 | * @sb2off: new offset of the secondary super block (in bytes) | |
368 | */ | |
369 | static int nilfs_move_2nd_super(struct super_block *sb, loff_t sb2off) | |
370 | { | |
371 | struct the_nilfs *nilfs = sb->s_fs_info; | |
372 | struct buffer_head *nsbh; | |
373 | struct nilfs_super_block *nsbp; | |
374 | sector_t blocknr, newblocknr; | |
375 | unsigned long offset; | |
4f05028f | 376 | int sb2i; /* array index of the secondary superblock */ |
cfb0a4bf RK |
377 | int ret = 0; |
378 | ||
379 | /* nilfs->ns_sem must be locked by the caller. */ | |
380 | if (nilfs->ns_sbh[1] && | |
381 | nilfs->ns_sbh[1]->b_blocknr > nilfs->ns_first_data_block) { | |
382 | sb2i = 1; | |
383 | blocknr = nilfs->ns_sbh[1]->b_blocknr; | |
384 | } else if (nilfs->ns_sbh[0]->b_blocknr > nilfs->ns_first_data_block) { | |
385 | sb2i = 0; | |
386 | blocknr = nilfs->ns_sbh[0]->b_blocknr; | |
4f05028f RK |
387 | } else { |
388 | sb2i = -1; | |
389 | blocknr = 0; | |
cfb0a4bf RK |
390 | } |
391 | if (sb2i >= 0 && (u64)blocknr << nilfs->ns_blocksize_bits == sb2off) | |
392 | goto out; /* super block location is unchanged */ | |
393 | ||
394 | /* Get new super block buffer */ | |
395 | newblocknr = sb2off >> nilfs->ns_blocksize_bits; | |
396 | offset = sb2off & (nilfs->ns_blocksize - 1); | |
397 | nsbh = sb_getblk(sb, newblocknr); | |
398 | if (!nsbh) { | |
399 | printk(KERN_WARNING | |
400 | "NILFS warning: unable to move secondary superblock " | |
401 | "to block %llu\n", (unsigned long long)newblocknr); | |
402 | ret = -EIO; | |
403 | goto out; | |
404 | } | |
405 | nsbp = (void *)nsbh->b_data + offset; | |
406 | memset(nsbp, 0, nilfs->ns_blocksize); | |
407 | ||
408 | if (sb2i >= 0) { | |
409 | memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize); | |
410 | brelse(nilfs->ns_sbh[sb2i]); | |
411 | nilfs->ns_sbh[sb2i] = nsbh; | |
412 | nilfs->ns_sbp[sb2i] = nsbp; | |
413 | } else if (nilfs->ns_sbh[0]->b_blocknr < nilfs->ns_first_data_block) { | |
414 | /* secondary super block will be restored to index 1 */ | |
415 | nilfs->ns_sbh[1] = nsbh; | |
416 | nilfs->ns_sbp[1] = nsbp; | |
417 | } else { | |
418 | brelse(nsbh); | |
419 | } | |
420 | out: | |
421 | return ret; | |
422 | } | |
423 | ||
4e33f9ea RK |
424 | /** |
425 | * nilfs_resize_fs - resize the filesystem | |
426 | * @sb: super block instance | |
427 | * @newsize: new size of the filesystem (in bytes) | |
428 | */ | |
429 | int nilfs_resize_fs(struct super_block *sb, __u64 newsize) | |
430 | { | |
431 | struct the_nilfs *nilfs = sb->s_fs_info; | |
432 | struct nilfs_super_block **sbp; | |
433 | __u64 devsize, newnsegs; | |
434 | loff_t sb2off; | |
435 | int ret; | |
436 | ||
437 | ret = -ERANGE; | |
438 | devsize = i_size_read(sb->s_bdev->bd_inode); | |
439 | if (newsize > devsize) | |
440 | goto out; | |
441 | ||
442 | /* | |
443 | * Write lock is required to protect some functions depending | |
444 | * on the number of segments, the number of reserved segments, | |
445 | * and so forth. | |
446 | */ | |
447 | down_write(&nilfs->ns_segctor_sem); | |
448 | ||
449 | sb2off = NILFS_SB2_OFFSET_BYTES(newsize); | |
450 | newnsegs = sb2off >> nilfs->ns_blocksize_bits; | |
451 | do_div(newnsegs, nilfs->ns_blocks_per_segment); | |
452 | ||
453 | ret = nilfs_sufile_resize(nilfs->ns_sufile, newnsegs); | |
454 | up_write(&nilfs->ns_segctor_sem); | |
455 | if (ret < 0) | |
456 | goto out; | |
457 | ||
458 | ret = nilfs_construct_segment(sb); | |
459 | if (ret < 0) | |
460 | goto out; | |
461 | ||
462 | down_write(&nilfs->ns_sem); | |
463 | nilfs_move_2nd_super(sb, sb2off); | |
464 | ret = -EIO; | |
465 | sbp = nilfs_prepare_super(sb, 0); | |
466 | if (likely(sbp)) { | |
467 | nilfs_set_log_cursor(sbp[0], nilfs); | |
468 | /* | |
469 | * Drop NILFS_RESIZE_FS flag for compatibility with | |
470 | * mount-time resize which may be implemented in a | |
471 | * future release. | |
472 | */ | |
473 | sbp[0]->s_state = cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & | |
474 | ~NILFS_RESIZE_FS); | |
475 | sbp[0]->s_dev_size = cpu_to_le64(newsize); | |
476 | sbp[0]->s_nsegments = cpu_to_le64(nilfs->ns_nsegments); | |
477 | if (sbp[1]) | |
478 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
479 | ret = nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); | |
480 | } | |
481 | up_write(&nilfs->ns_sem); | |
482 | ||
483 | /* | |
484 | * Reset the range of allocatable segments last. This order | |
485 | * is important in the case of expansion because the secondary | |
486 | * superblock must be protected from log write until migration | |
487 | * completes. | |
488 | */ | |
489 | if (!ret) | |
490 | nilfs_sufile_set_alloc_range(nilfs->ns_sufile, 0, newnsegs - 1); | |
491 | out: | |
492 | return ret; | |
493 | } | |
494 | ||
783f6184 RK |
495 | static void nilfs_put_super(struct super_block *sb) |
496 | { | |
e3154e97 | 497 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 498 | |
f7545144 | 499 | nilfs_detach_log_writer(sb); |
783f6184 RK |
500 | |
501 | if (!(sb->s_flags & MS_RDONLY)) { | |
502 | down_write(&nilfs->ns_sem); | |
f7545144 | 503 | nilfs_cleanup_super(sb); |
783f6184 RK |
504 | up_write(&nilfs->ns_sem); |
505 | } | |
506 | ||
f1e89c86 RK |
507 | iput(nilfs->ns_sufile); |
508 | iput(nilfs->ns_cpfile); | |
509 | iput(nilfs->ns_dat); | |
510 | ||
348fe8da | 511 | destroy_nilfs(nilfs); |
783f6184 | 512 | sb->s_fs_info = NULL; |
783f6184 RK |
513 | } |
514 | ||
783f6184 RK |
515 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
516 | { | |
e3154e97 | 517 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 518 | struct nilfs_super_block **sbp; |
783f6184 RK |
519 | int err = 0; |
520 | ||
521 | /* This function is called when super block should be written back */ | |
522 | if (wait) | |
523 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
524 | |
525 | down_write(&nilfs->ns_sem); | |
d26493b6 | 526 | if (nilfs_sb_dirty(nilfs)) { |
f7545144 | 527 | sbp = nilfs_prepare_super(sb, nilfs_sb_will_flip(nilfs)); |
b2ac86e1 JS |
528 | if (likely(sbp)) { |
529 | nilfs_set_log_cursor(sbp[0], nilfs); | |
f7545144 | 530 | nilfs_commit_super(sb, NILFS_SB_COMMIT); |
b2ac86e1 | 531 | } |
d26493b6 | 532 | } |
6233caa9 JS |
533 | up_write(&nilfs->ns_sem); |
534 | ||
e2c7617a AR |
535 | if (!err) |
536 | err = nilfs_flush_device(nilfs); | |
537 | ||
783f6184 RK |
538 | return err; |
539 | } | |
540 | ||
f7545144 | 541 | int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt, |
4d8d9293 | 542 | struct nilfs_root **rootp) |
783f6184 | 543 | { |
e3154e97 | 544 | struct the_nilfs *nilfs = sb->s_fs_info; |
4d8d9293 | 545 | struct nilfs_root *root; |
783f6184 RK |
546 | struct nilfs_checkpoint *raw_cp; |
547 | struct buffer_head *bh_cp; | |
4d8d9293 | 548 | int err = -ENOMEM; |
783f6184 | 549 | |
4d8d9293 RK |
550 | root = nilfs_find_or_create_root( |
551 | nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); | |
552 | if (!root) | |
553 | return err; | |
783f6184 | 554 | |
e912a5b6 RK |
555 | if (root->ifile) |
556 | goto reuse; /* already attached checkpoint */ | |
783f6184 | 557 | |
1154ecbd | 558 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
559 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
560 | &bh_cp); | |
1154ecbd | 561 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
562 | if (unlikely(err)) { |
563 | if (err == -ENOENT || err == -EINVAL) { | |
564 | printk(KERN_ERR | |
565 | "NILFS: Invalid checkpoint " | |
566 | "(checkpoint number=%llu)\n", | |
567 | (unsigned long long)cno); | |
568 | err = -EINVAL; | |
569 | } | |
570 | goto failed; | |
571 | } | |
f1e89c86 | 572 | |
f7545144 | 573 | err = nilfs_ifile_read(sb, root, nilfs->ns_inode_size, |
f1e89c86 RK |
574 | &raw_cp->cp_ifile_inode, &root->ifile); |
575 | if (err) | |
783f6184 | 576 | goto failed_bh; |
b7c06342 | 577 | |
e5f7f848 VD |
578 | atomic64_set(&root->inodes_count, |
579 | le64_to_cpu(raw_cp->cp_inodes_count)); | |
580 | atomic64_set(&root->blocks_count, | |
581 | le64_to_cpu(raw_cp->cp_blocks_count)); | |
783f6184 RK |
582 | |
583 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
4d8d9293 | 584 | |
e912a5b6 | 585 | reuse: |
4d8d9293 | 586 | *rootp = root; |
783f6184 RK |
587 | return 0; |
588 | ||
589 | failed_bh: | |
590 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
591 | failed: | |
4d8d9293 | 592 | nilfs_put_root(root); |
783f6184 RK |
593 | |
594 | return err; | |
595 | } | |
783f6184 | 596 | |
5beb6e0b RK |
597 | static int nilfs_freeze(struct super_block *sb) |
598 | { | |
e3154e97 | 599 | struct the_nilfs *nilfs = sb->s_fs_info; |
5beb6e0b RK |
600 | int err; |
601 | ||
602 | if (sb->s_flags & MS_RDONLY) | |
603 | return 0; | |
783f6184 | 604 | |
5beb6e0b RK |
605 | /* Mark super block clean */ |
606 | down_write(&nilfs->ns_sem); | |
f7545144 | 607 | err = nilfs_cleanup_super(sb); |
5beb6e0b | 608 | up_write(&nilfs->ns_sem); |
783f6184 RK |
609 | return err; |
610 | } | |
611 | ||
5beb6e0b | 612 | static int nilfs_unfreeze(struct super_block *sb) |
783f6184 | 613 | { |
e3154e97 | 614 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 615 | |
5beb6e0b RK |
616 | if (sb->s_flags & MS_RDONLY) |
617 | return 0; | |
618 | ||
619 | down_write(&nilfs->ns_sem); | |
f7545144 | 620 | nilfs_setup_super(sb, false); |
5beb6e0b RK |
621 | up_write(&nilfs->ns_sem); |
622 | return 0; | |
783f6184 RK |
623 | } |
624 | ||
783f6184 RK |
625 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
626 | { | |
627 | struct super_block *sb = dentry->d_sb; | |
2b0143b5 | 628 | struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root; |
b7c06342 | 629 | struct the_nilfs *nilfs = root->nilfs; |
c306af23 | 630 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
783f6184 RK |
631 | unsigned long long blocks; |
632 | unsigned long overhead; | |
633 | unsigned long nrsvblocks; | |
634 | sector_t nfreeblocks; | |
c7ef972c | 635 | u64 nmaxinodes, nfreeinodes; |
783f6184 RK |
636 | int err; |
637 | ||
638 | /* | |
639 | * Compute all of the segment blocks | |
640 | * | |
641 | * The blocks before first segment and after last segment | |
642 | * are excluded. | |
643 | */ | |
644 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
645 | - nilfs->ns_first_data_block; | |
646 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
647 | ||
648 | /* | |
649 | * Compute the overhead | |
650 | * | |
7a65004b | 651 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
652 | * We must count them as the overhead. |
653 | */ | |
654 | overhead = 0; | |
655 | ||
656 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
657 | if (unlikely(err)) | |
658 | return err; | |
659 | ||
c7ef972c VD |
660 | err = nilfs_ifile_count_free_inodes(root->ifile, |
661 | &nmaxinodes, &nfreeinodes); | |
662 | if (unlikely(err)) { | |
663 | printk(KERN_WARNING | |
664 | "NILFS warning: fail to count free inodes: err %d.\n", | |
665 | err); | |
666 | if (err == -ERANGE) { | |
667 | /* | |
668 | * If nilfs_palloc_count_max_entries() returns | |
669 | * -ERANGE error code then we simply treat | |
670 | * curent inodes count as maximum possible and | |
671 | * zero as free inodes value. | |
672 | */ | |
e5f7f848 | 673 | nmaxinodes = atomic64_read(&root->inodes_count); |
c7ef972c VD |
674 | nfreeinodes = 0; |
675 | err = 0; | |
676 | } else | |
677 | return err; | |
678 | } | |
679 | ||
783f6184 RK |
680 | buf->f_type = NILFS_SUPER_MAGIC; |
681 | buf->f_bsize = sb->s_blocksize; | |
682 | buf->f_blocks = blocks - overhead; | |
683 | buf->f_bfree = nfreeblocks; | |
684 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
685 | (buf->f_bfree - nrsvblocks) : 0; | |
c7ef972c VD |
686 | buf->f_files = nmaxinodes; |
687 | buf->f_ffree = nfreeinodes; | |
783f6184 | 688 | buf->f_namelen = NILFS_NAME_LEN; |
c306af23 RK |
689 | buf->f_fsid.val[0] = (u32)id; |
690 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
691 | ||
783f6184 RK |
692 | return 0; |
693 | } | |
694 | ||
34c80b1d | 695 | static int nilfs_show_options(struct seq_file *seq, struct dentry *dentry) |
b58a285b | 696 | { |
34c80b1d | 697 | struct super_block *sb = dentry->d_sb; |
e3154e97 | 698 | struct the_nilfs *nilfs = sb->s_fs_info; |
2b0143b5 | 699 | struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root; |
b58a285b | 700 | |
3b2ce58b | 701 | if (!nilfs_test_opt(nilfs, BARRIER)) |
c6b4d57d | 702 | seq_puts(seq, ",nobarrier"); |
f11459ad RK |
703 | if (root->cno != NILFS_CPTREE_CURRENT_CNO) |
704 | seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno); | |
3b2ce58b | 705 | if (nilfs_test_opt(nilfs, ERRORS_PANIC)) |
c6b4d57d | 706 | seq_puts(seq, ",errors=panic"); |
3b2ce58b | 707 | if (nilfs_test_opt(nilfs, ERRORS_CONT)) |
c6b4d57d | 708 | seq_puts(seq, ",errors=continue"); |
3b2ce58b | 709 | if (nilfs_test_opt(nilfs, STRICT_ORDER)) |
c6b4d57d | 710 | seq_puts(seq, ",order=strict"); |
3b2ce58b | 711 | if (nilfs_test_opt(nilfs, NORECOVERY)) |
c6b4d57d | 712 | seq_puts(seq, ",norecovery"); |
3b2ce58b | 713 | if (nilfs_test_opt(nilfs, DISCARD)) |
c6b4d57d | 714 | seq_puts(seq, ",discard"); |
b58a285b JS |
715 | |
716 | return 0; | |
717 | } | |
718 | ||
b87221de | 719 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
720 | .alloc_inode = nilfs_alloc_inode, |
721 | .destroy_inode = nilfs_destroy_inode, | |
722 | .dirty_inode = nilfs_dirty_inode, | |
6fd1e5c9 | 723 | .evict_inode = nilfs_evict_inode, |
783f6184 | 724 | .put_super = nilfs_put_super, |
783f6184 | 725 | .sync_fs = nilfs_sync_fs, |
5beb6e0b RK |
726 | .freeze_fs = nilfs_freeze, |
727 | .unfreeze_fs = nilfs_unfreeze, | |
783f6184 RK |
728 | .statfs = nilfs_statfs, |
729 | .remount_fs = nilfs_remount, | |
b58a285b | 730 | .show_options = nilfs_show_options |
783f6184 RK |
731 | }; |
732 | ||
783f6184 RK |
733 | enum { |
734 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
773bc4f3 | 735 | Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
802d3177 | 736 | Opt_discard, Opt_nodiscard, Opt_err, |
783f6184 RK |
737 | }; |
738 | ||
739 | static match_table_t tokens = { | |
740 | {Opt_err_cont, "errors=continue"}, | |
741 | {Opt_err_panic, "errors=panic"}, | |
742 | {Opt_err_ro, "errors=remount-ro"}, | |
773bc4f3 | 743 | {Opt_barrier, "barrier"}, |
91f1953b | 744 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
745 | {Opt_snapshot, "cp=%u"}, |
746 | {Opt_order, "order=%s"}, | |
0234576d | 747 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 748 | {Opt_discard, "discard"}, |
802d3177 | 749 | {Opt_nodiscard, "nodiscard"}, |
783f6184 RK |
750 | {Opt_err, NULL} |
751 | }; | |
752 | ||
7c017457 | 753 | static int parse_options(char *options, struct super_block *sb, int is_remount) |
783f6184 | 754 | { |
e3154e97 | 755 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 RK |
756 | char *p; |
757 | substring_t args[MAX_OPT_ARGS]; | |
783f6184 RK |
758 | |
759 | if (!options) | |
760 | return 1; | |
761 | ||
762 | while ((p = strsep(&options, ",")) != NULL) { | |
763 | int token; | |
4ad364ca | 764 | |
783f6184 RK |
765 | if (!*p) |
766 | continue; | |
767 | ||
768 | token = match_token(p, tokens, args); | |
769 | switch (token) { | |
773bc4f3 | 770 | case Opt_barrier: |
3b2ce58b | 771 | nilfs_set_opt(nilfs, BARRIER); |
773bc4f3 | 772 | break; |
91f1953b | 773 | case Opt_nobarrier: |
3b2ce58b | 774 | nilfs_clear_opt(nilfs, BARRIER); |
783f6184 RK |
775 | break; |
776 | case Opt_order: | |
777 | if (strcmp(args[0].from, "relaxed") == 0) | |
778 | /* Ordered data semantics */ | |
3b2ce58b | 779 | nilfs_clear_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
780 | else if (strcmp(args[0].from, "strict") == 0) |
781 | /* Strict in-order semantics */ | |
3b2ce58b | 782 | nilfs_set_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
783 | else |
784 | return 0; | |
785 | break; | |
786 | case Opt_err_panic: | |
3b2ce58b | 787 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC); |
783f6184 RK |
788 | break; |
789 | case Opt_err_ro: | |
3b2ce58b | 790 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO); |
783f6184 RK |
791 | break; |
792 | case Opt_err_cont: | |
3b2ce58b | 793 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT); |
783f6184 RK |
794 | break; |
795 | case Opt_snapshot: | |
7c017457 | 796 | if (is_remount) { |
f11459ad RK |
797 | printk(KERN_ERR |
798 | "NILFS: \"%s\" option is invalid " | |
799 | "for remount.\n", p); | |
783f6184 | 800 | return 0; |
7c017457 | 801 | } |
783f6184 | 802 | break; |
0234576d | 803 | case Opt_norecovery: |
3b2ce58b | 804 | nilfs_set_opt(nilfs, NORECOVERY); |
0234576d | 805 | break; |
e902ec99 | 806 | case Opt_discard: |
3b2ce58b | 807 | nilfs_set_opt(nilfs, DISCARD); |
e902ec99 | 808 | break; |
802d3177 | 809 | case Opt_nodiscard: |
3b2ce58b | 810 | nilfs_clear_opt(nilfs, DISCARD); |
802d3177 | 811 | break; |
783f6184 RK |
812 | default: |
813 | printk(KERN_ERR | |
814 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
815 | return 0; | |
816 | } | |
817 | } | |
818 | return 1; | |
819 | } | |
820 | ||
821 | static inline void | |
3b2ce58b | 822 | nilfs_set_default_options(struct super_block *sb, |
783f6184 RK |
823 | struct nilfs_super_block *sbp) |
824 | { | |
e3154e97 | 825 | struct the_nilfs *nilfs = sb->s_fs_info; |
3b2ce58b RK |
826 | |
827 | nilfs->ns_mount_opt = | |
277a6a34 | 828 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
829 | } |
830 | ||
f7545144 | 831 | static int nilfs_setup_super(struct super_block *sb, int is_mount) |
783f6184 | 832 | { |
e3154e97 | 833 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 JS |
834 | struct nilfs_super_block **sbp; |
835 | int max_mnt_count; | |
836 | int mnt_count; | |
837 | ||
838 | /* nilfs->ns_sem must be locked by the caller. */ | |
f7545144 | 839 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 JS |
840 | if (!sbp) |
841 | return -EIO; | |
842 | ||
5beb6e0b RK |
843 | if (!is_mount) |
844 | goto skip_mount_setup; | |
845 | ||
d26493b6 JS |
846 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); |
847 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); | |
783f6184 | 848 | |
f50a4c81 | 849 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
783f6184 RK |
850 | printk(KERN_WARNING |
851 | "NILFS warning: mounting fs with errors\n"); | |
852 | #if 0 | |
853 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
854 | printk(KERN_WARNING | |
855 | "NILFS warning: maximal mount count reached\n"); | |
856 | #endif | |
857 | } | |
858 | if (!max_mnt_count) | |
d26493b6 | 859 | sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
783f6184 | 860 | |
d26493b6 | 861 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
5beb6e0b RK |
862 | sbp[0]->s_mtime = cpu_to_le64(get_seconds()); |
863 | ||
864 | skip_mount_setup: | |
d26493b6 JS |
865 | sbp[0]->s_state = |
866 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); | |
b2ac86e1 | 867 | /* synchronize sbp[1] with sbp[0] */ |
0ca7a5b9 RK |
868 | if (sbp[1]) |
869 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
f7545144 | 870 | return nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); |
783f6184 RK |
871 | } |
872 | ||
e339ad31 RK |
873 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
874 | u64 pos, int blocksize, | |
875 | struct buffer_head **pbh) | |
783f6184 | 876 | { |
e339ad31 RK |
877 | unsigned long long sb_index = pos; |
878 | unsigned long offset; | |
783f6184 | 879 | |
e339ad31 | 880 | offset = do_div(sb_index, blocksize); |
783f6184 | 881 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 882 | if (!*pbh) |
783f6184 | 883 | return NULL; |
783f6184 RK |
884 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
885 | } | |
886 | ||
783f6184 RK |
887 | int nilfs_store_magic_and_option(struct super_block *sb, |
888 | struct nilfs_super_block *sbp, | |
889 | char *data) | |
890 | { | |
e3154e97 | 891 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 892 | |
783f6184 RK |
893 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
894 | ||
895 | /* FS independent flags */ | |
896 | #ifdef NILFS_ATIME_DISABLE | |
897 | sb->s_flags |= MS_NOATIME; | |
898 | #endif | |
899 | ||
3b2ce58b | 900 | nilfs_set_default_options(sb, sbp); |
783f6184 | 901 | |
574e6c31 RK |
902 | nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid); |
903 | nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid); | |
904 | nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval); | |
905 | nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max); | |
783f6184 | 906 | |
c9cb9b5c | 907 | return !parse_options(data, sb, 0) ? -EINVAL : 0; |
783f6184 RK |
908 | } |
909 | ||
c5ca48aa RK |
910 | int nilfs_check_feature_compatibility(struct super_block *sb, |
911 | struct nilfs_super_block *sbp) | |
912 | { | |
913 | __u64 features; | |
914 | ||
915 | features = le64_to_cpu(sbp->s_feature_incompat) & | |
916 | ~NILFS_FEATURE_INCOMPAT_SUPP; | |
917 | if (features) { | |
918 | printk(KERN_ERR "NILFS: couldn't mount because of unsupported " | |
919 | "optional features (%llx)\n", | |
920 | (unsigned long long)features); | |
921 | return -EINVAL; | |
922 | } | |
923 | features = le64_to_cpu(sbp->s_feature_compat_ro) & | |
924 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
925 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
926 | printk(KERN_ERR "NILFS: couldn't mount RDWR because of " | |
927 | "unsupported optional features (%llx)\n", | |
928 | (unsigned long long)features); | |
929 | return -EINVAL; | |
930 | } | |
931 | return 0; | |
932 | } | |
933 | ||
367ea334 RK |
934 | static int nilfs_get_root_dentry(struct super_block *sb, |
935 | struct nilfs_root *root, | |
936 | struct dentry **root_dentry) | |
937 | { | |
938 | struct inode *inode; | |
939 | struct dentry *dentry; | |
940 | int ret = 0; | |
941 | ||
942 | inode = nilfs_iget(sb, root, NILFS_ROOT_INO); | |
943 | if (IS_ERR(inode)) { | |
944 | printk(KERN_ERR "NILFS: get root inode failed\n"); | |
945 | ret = PTR_ERR(inode); | |
946 | goto out; | |
947 | } | |
948 | if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { | |
949 | iput(inode); | |
950 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); | |
951 | ret = -EINVAL; | |
952 | goto out; | |
953 | } | |
954 | ||
f11459ad RK |
955 | if (root->cno == NILFS_CPTREE_CURRENT_CNO) { |
956 | dentry = d_find_alias(inode); | |
957 | if (!dentry) { | |
48fde701 | 958 | dentry = d_make_root(inode); |
f11459ad | 959 | if (!dentry) { |
f11459ad RK |
960 | ret = -ENOMEM; |
961 | goto failed_dentry; | |
962 | } | |
963 | } else { | |
964 | iput(inode); | |
965 | } | |
966 | } else { | |
1a0a397e | 967 | dentry = d_obtain_root(inode); |
f11459ad RK |
968 | if (IS_ERR(dentry)) { |
969 | ret = PTR_ERR(dentry); | |
970 | goto failed_dentry; | |
971 | } | |
367ea334 RK |
972 | } |
973 | *root_dentry = dentry; | |
974 | out: | |
975 | return ret; | |
f11459ad RK |
976 | |
977 | failed_dentry: | |
978 | printk(KERN_ERR "NILFS: get root dentry failed\n"); | |
979 | goto out; | |
367ea334 RK |
980 | } |
981 | ||
ab4d8f7e RK |
982 | static int nilfs_attach_snapshot(struct super_block *s, __u64 cno, |
983 | struct dentry **root_dentry) | |
984 | { | |
e3154e97 | 985 | struct the_nilfs *nilfs = s->s_fs_info; |
ab4d8f7e RK |
986 | struct nilfs_root *root; |
987 | int ret; | |
988 | ||
572d8b39 RK |
989 | mutex_lock(&nilfs->ns_snapshot_mount_mutex); |
990 | ||
ab4d8f7e RK |
991 | down_read(&nilfs->ns_segctor_sem); |
992 | ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno); | |
993 | up_read(&nilfs->ns_segctor_sem); | |
994 | if (ret < 0) { | |
995 | ret = (ret == -ENOENT) ? -EINVAL : ret; | |
996 | goto out; | |
997 | } else if (!ret) { | |
998 | printk(KERN_ERR "NILFS: The specified checkpoint is " | |
999 | "not a snapshot (checkpoint number=%llu).\n", | |
1000 | (unsigned long long)cno); | |
1001 | ret = -EINVAL; | |
1002 | goto out; | |
1003 | } | |
1004 | ||
f7545144 | 1005 | ret = nilfs_attach_checkpoint(s, cno, false, &root); |
ab4d8f7e RK |
1006 | if (ret) { |
1007 | printk(KERN_ERR "NILFS: error loading snapshot " | |
1008 | "(checkpoint number=%llu).\n", | |
1009 | (unsigned long long)cno); | |
1010 | goto out; | |
1011 | } | |
1012 | ret = nilfs_get_root_dentry(s, root, root_dentry); | |
1013 | nilfs_put_root(root); | |
1014 | out: | |
572d8b39 | 1015 | mutex_unlock(&nilfs->ns_snapshot_mount_mutex); |
ab4d8f7e RK |
1016 | return ret; |
1017 | } | |
1018 | ||
f11459ad | 1019 | /** |
e95c311e | 1020 | * nilfs_tree_is_busy() - try to shrink dentries of a checkpoint |
f11459ad RK |
1021 | * @root_dentry: root dentry of the tree to be shrunk |
1022 | * | |
1023 | * This function returns true if the tree was in-use. | |
1024 | */ | |
e95c311e | 1025 | static bool nilfs_tree_is_busy(struct dentry *root_dentry) |
f11459ad | 1026 | { |
f11459ad | 1027 | shrink_dcache_parent(root_dentry); |
e95c311e | 1028 | return d_count(root_dentry) > 1; |
f11459ad RK |
1029 | } |
1030 | ||
032dbb3b RK |
1031 | int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno) |
1032 | { | |
e3154e97 | 1033 | struct the_nilfs *nilfs = sb->s_fs_info; |
032dbb3b RK |
1034 | struct nilfs_root *root; |
1035 | struct inode *inode; | |
1036 | struct dentry *dentry; | |
1037 | int ret; | |
1038 | ||
3377f843 | 1039 | if (cno > nilfs->ns_cno) |
032dbb3b RK |
1040 | return false; |
1041 | ||
1042 | if (cno >= nilfs_last_cno(nilfs)) | |
1043 | return true; /* protect recent checkpoints */ | |
1044 | ||
1045 | ret = false; | |
e3154e97 | 1046 | root = nilfs_lookup_root(nilfs, cno); |
032dbb3b RK |
1047 | if (root) { |
1048 | inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO); | |
1049 | if (inode) { | |
1050 | dentry = d_find_alias(inode); | |
1051 | if (dentry) { | |
e95c311e | 1052 | ret = nilfs_tree_is_busy(dentry); |
032dbb3b RK |
1053 | dput(dentry); |
1054 | } | |
1055 | iput(inode); | |
1056 | } | |
1057 | nilfs_put_root(root); | |
1058 | } | |
1059 | return ret; | |
1060 | } | |
1061 | ||
783f6184 RK |
1062 | /** |
1063 | * nilfs_fill_super() - initialize a super block instance | |
1064 | * @sb: super_block | |
1065 | * @data: mount options | |
1066 | * @silent: silent mode flag | |
783f6184 | 1067 | * |
aa7dfb89 | 1068 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
1069 | * So, the recovery process is protected from other simultaneous mounts. |
1070 | */ | |
1071 | static int | |
348fe8da | 1072 | nilfs_fill_super(struct super_block *sb, void *data, int silent) |
783f6184 | 1073 | { |
348fe8da | 1074 | struct the_nilfs *nilfs; |
4d8d9293 | 1075 | struct nilfs_root *fsroot; |
783f6184 RK |
1076 | __u64 cno; |
1077 | int err; | |
1078 | ||
e3154e97 RK |
1079 | nilfs = alloc_nilfs(sb->s_bdev); |
1080 | if (!nilfs) | |
783f6184 RK |
1081 | return -ENOMEM; |
1082 | ||
e3154e97 | 1083 | sb->s_fs_info = nilfs; |
783f6184 | 1084 | |
f7545144 | 1085 | err = init_nilfs(nilfs, sb, (char *)data); |
783f6184 | 1086 | if (err) |
348fe8da | 1087 | goto failed_nilfs; |
783f6184 | 1088 | |
783f6184 RK |
1089 | sb->s_op = &nilfs_sops; |
1090 | sb->s_export_op = &nilfs_export_ops; | |
1091 | sb->s_root = NULL; | |
61239230 | 1092 | sb->s_time_gran = 1; |
8de52778 | 1093 | sb->s_max_links = NILFS_LINK_MAX; |
026a7d63 | 1094 | |
26ff1304 | 1095 | sb->s_bdi = &bdev_get_queue(sb->s_bdev)->backing_dev_info; |
783f6184 | 1096 | |
f7545144 | 1097 | err = load_nilfs(nilfs, sb); |
f50a4c81 | 1098 | if (err) |
348fe8da | 1099 | goto failed_nilfs; |
f50a4c81 | 1100 | |
783f6184 | 1101 | cno = nilfs_last_cno(nilfs); |
f7545144 | 1102 | err = nilfs_attach_checkpoint(sb, cno, true, &fsroot); |
783f6184 | 1103 | if (err) { |
f11459ad RK |
1104 | printk(KERN_ERR "NILFS: error loading last checkpoint " |
1105 | "(checkpoint number=%llu).\n", (unsigned long long)cno); | |
f1e89c86 | 1106 | goto failed_unload; |
783f6184 RK |
1107 | } |
1108 | ||
1109 | if (!(sb->s_flags & MS_RDONLY)) { | |
f7545144 | 1110 | err = nilfs_attach_log_writer(sb, fsroot); |
783f6184 RK |
1111 | if (err) |
1112 | goto failed_checkpoint; | |
1113 | } | |
1114 | ||
367ea334 RK |
1115 | err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root); |
1116 | if (err) | |
783f6184 | 1117 | goto failed_segctor; |
783f6184 | 1118 | |
4d8d9293 | 1119 | nilfs_put_root(fsroot); |
783f6184 RK |
1120 | |
1121 | if (!(sb->s_flags & MS_RDONLY)) { | |
1122 | down_write(&nilfs->ns_sem); | |
f7545144 | 1123 | nilfs_setup_super(sb, true); |
783f6184 RK |
1124 | up_write(&nilfs->ns_sem); |
1125 | } | |
1126 | ||
783f6184 RK |
1127 | return 0; |
1128 | ||
783f6184 | 1129 | failed_segctor: |
f7545144 | 1130 | nilfs_detach_log_writer(sb); |
783f6184 RK |
1131 | |
1132 | failed_checkpoint: | |
4d8d9293 | 1133 | nilfs_put_root(fsroot); |
783f6184 | 1134 | |
f1e89c86 RK |
1135 | failed_unload: |
1136 | iput(nilfs->ns_sufile); | |
1137 | iput(nilfs->ns_cpfile); | |
1138 | iput(nilfs->ns_dat); | |
1139 | ||
348fe8da RK |
1140 | failed_nilfs: |
1141 | destroy_nilfs(nilfs); | |
783f6184 RK |
1142 | return err; |
1143 | } | |
1144 | ||
1145 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
1146 | { | |
e3154e97 | 1147 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 1148 | unsigned long old_sb_flags; |
06df0f99 | 1149 | unsigned long old_mount_opt; |
f11459ad | 1150 | int err; |
783f6184 | 1151 | |
02b9984d | 1152 | sync_filesystem(sb); |
783f6184 | 1153 | old_sb_flags = sb->s_flags; |
3b2ce58b | 1154 | old_mount_opt = nilfs->ns_mount_opt; |
783f6184 | 1155 | |
7c017457 | 1156 | if (!parse_options(data, sb, 1)) { |
783f6184 RK |
1157 | err = -EINVAL; |
1158 | goto restore_opts; | |
1159 | } | |
1160 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); | |
1161 | ||
d240e067 | 1162 | err = -EINVAL; |
783f6184 | 1163 | |
0234576d RK |
1164 | if (!nilfs_valid_fs(nilfs)) { |
1165 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1166 | "remount because the filesystem is in an " | |
1167 | "incomplete recovery state.\n", sb->s_id); | |
0234576d RK |
1168 | goto restore_opts; |
1169 | } | |
1170 | ||
783f6184 RK |
1171 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
1172 | goto out; | |
1173 | if (*flags & MS_RDONLY) { | |
f7545144 RK |
1174 | /* Shutting down log writer */ |
1175 | nilfs_detach_log_writer(sb); | |
783f6184 RK |
1176 | sb->s_flags |= MS_RDONLY; |
1177 | ||
783f6184 RK |
1178 | /* |
1179 | * Remounting a valid RW partition RDONLY, so set | |
1180 | * the RDONLY flag and then mark the partition as valid again. | |
1181 | */ | |
1182 | down_write(&nilfs->ns_sem); | |
f7545144 | 1183 | nilfs_cleanup_super(sb); |
783f6184 RK |
1184 | up_write(&nilfs->ns_sem); |
1185 | } else { | |
c5ca48aa | 1186 | __u64 features; |
e912a5b6 | 1187 | struct nilfs_root *root; |
c5ca48aa | 1188 | |
783f6184 RK |
1189 | /* |
1190 | * Mounting a RDONLY partition read-write, so reread and | |
1191 | * store the current valid flag. (It may have been changed | |
1192 | * by fsck since we originally mounted the partition.) | |
1193 | */ | |
c5ca48aa RK |
1194 | down_read(&nilfs->ns_sem); |
1195 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & | |
1196 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
1197 | up_read(&nilfs->ns_sem); | |
1198 | if (features) { | |
1199 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1200 | "remount RDWR because of unsupported optional " | |
1201 | "features (%llx)\n", | |
1202 | sb->s_id, (unsigned long long)features); | |
1203 | err = -EROFS; | |
1204 | goto restore_opts; | |
1205 | } | |
1206 | ||
783f6184 | 1207 | sb->s_flags &= ~MS_RDONLY; |
783f6184 | 1208 | |
2b0143b5 | 1209 | root = NILFS_I(d_inode(sb->s_root))->i_root; |
f7545144 | 1210 | err = nilfs_attach_log_writer(sb, root); |
783f6184 | 1211 | if (err) |
e59399d0 | 1212 | goto restore_opts; |
783f6184 RK |
1213 | |
1214 | down_write(&nilfs->ns_sem); | |
f7545144 | 1215 | nilfs_setup_super(sb, true); |
783f6184 | 1216 | up_write(&nilfs->ns_sem); |
783f6184 RK |
1217 | } |
1218 | out: | |
1219 | return 0; | |
1220 | ||
783f6184 RK |
1221 | restore_opts: |
1222 | sb->s_flags = old_sb_flags; | |
3b2ce58b | 1223 | nilfs->ns_mount_opt = old_mount_opt; |
783f6184 RK |
1224 | return err; |
1225 | } | |
1226 | ||
1227 | struct nilfs_super_data { | |
1228 | struct block_device *bdev; | |
1229 | __u64 cno; | |
1230 | int flags; | |
1231 | }; | |
1232 | ||
1233 | /** | |
1234 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
1235 | * @data: mount options | |
1236 | * @sd: nilfs_super_data | |
1237 | */ | |
1238 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
1239 | { | |
1240 | char *p, *options = data; | |
1241 | substring_t args[MAX_OPT_ARGS]; | |
c05dbfc2 | 1242 | int token; |
783f6184 RK |
1243 | int ret = 0; |
1244 | ||
1245 | do { | |
1246 | p = strsep(&options, ","); | |
1247 | if (p != NULL && *p) { | |
1248 | token = match_token(p, tokens, args); | |
1249 | if (token == Opt_snapshot) { | |
c05dbfc2 | 1250 | if (!(sd->flags & MS_RDONLY)) { |
783f6184 | 1251 | ret++; |
c05dbfc2 RK |
1252 | } else { |
1253 | sd->cno = simple_strtoull(args[0].from, | |
1254 | NULL, 0); | |
1255 | /* | |
1256 | * No need to see the end pointer; | |
1257 | * match_token() has done syntax | |
1258 | * checking. | |
1259 | */ | |
1260 | if (sd->cno == 0) | |
1261 | ret++; | |
783f6184 RK |
1262 | } |
1263 | } | |
1264 | if (ret) | |
1265 | printk(KERN_ERR | |
1266 | "NILFS: invalid mount option: %s\n", p); | |
1267 | } | |
1268 | if (!options) | |
1269 | break; | |
1270 | BUG_ON(options == data); | |
1271 | *(options - 1) = ','; | |
1272 | } while (!ret); | |
1273 | return ret; | |
1274 | } | |
1275 | ||
1276 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1277 | { | |
f11459ad | 1278 | s->s_bdev = data; |
783f6184 RK |
1279 | s->s_dev = s->s_bdev->bd_dev; |
1280 | return 0; | |
1281 | } | |
1282 | ||
1283 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 | 1284 | { |
f11459ad | 1285 | return (void *)s->s_bdev == data; |
783f6184 RK |
1286 | } |
1287 | ||
e4c59d61 AV |
1288 | static struct dentry * |
1289 | nilfs_mount(struct file_system_type *fs_type, int flags, | |
1290 | const char *dev_name, void *data) | |
783f6184 RK |
1291 | { |
1292 | struct nilfs_super_data sd; | |
33c8e57c | 1293 | struct super_block *s; |
d4d77629 | 1294 | fmode_t mode = FMODE_READ | FMODE_EXCL; |
f11459ad RK |
1295 | struct dentry *root_dentry; |
1296 | int err, s_new = false; | |
783f6184 | 1297 | |
13e90559 RK |
1298 | if (!(flags & MS_RDONLY)) |
1299 | mode |= FMODE_WRITE; | |
1300 | ||
d4d77629 | 1301 | sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type); |
d6d4c19c | 1302 | if (IS_ERR(sd.bdev)) |
e4c59d61 | 1303 | return ERR_CAST(sd.bdev); |
783f6184 | 1304 | |
783f6184 RK |
1305 | sd.cno = 0; |
1306 | sd.flags = flags; | |
1307 | if (nilfs_identify((char *)data, &sd)) { | |
1308 | err = -EINVAL; | |
1309 | goto failed; | |
1310 | } | |
1311 | ||
6dd47406 | 1312 | /* |
5beb6e0b RK |
1313 | * once the super is inserted into the list by sget, s_umount |
1314 | * will protect the lockfs code from trying to start a snapshot | |
1315 | * while we are mounting | |
6dd47406 | 1316 | */ |
5beb6e0b RK |
1317 | mutex_lock(&sd.bdev->bd_fsfreeze_mutex); |
1318 | if (sd.bdev->bd_fsfreeze_count > 0) { | |
1319 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); | |
1320 | err = -EBUSY; | |
1321 | goto failed; | |
1322 | } | |
9249e17f DH |
1323 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, flags, |
1324 | sd.bdev); | |
5beb6e0b | 1325 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); |
33c8e57c RK |
1326 | if (IS_ERR(s)) { |
1327 | err = PTR_ERR(s); | |
348fe8da | 1328 | goto failed; |
783f6184 RK |
1329 | } |
1330 | ||
1331 | if (!s->s_root) { | |
8fa7c320 | 1332 | s_new = true; |
f11459ad | 1333 | |
33c8e57c | 1334 | /* New superblock instance created */ |
4571b82c | 1335 | s->s_mode = mode; |
a1c6f057 | 1336 | snprintf(s->s_id, sizeof(s->s_id), "%pg", sd.bdev); |
783f6184 RK |
1337 | sb_set_blocksize(s, block_size(sd.bdev)); |
1338 | ||
348fe8da | 1339 | err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
783f6184 | 1340 | if (err) |
348fe8da | 1341 | goto failed_super; |
783f6184 RK |
1342 | |
1343 | s->s_flags |= MS_ACTIVE; | |
f11459ad | 1344 | } else if (!sd.cno) { |
e95c311e AV |
1345 | if (nilfs_tree_is_busy(s->s_root)) { |
1346 | if ((flags ^ s->s_flags) & MS_RDONLY) { | |
f11459ad RK |
1347 | printk(KERN_ERR "NILFS: the device already " |
1348 | "has a %s mount.\n", | |
1349 | (s->s_flags & MS_RDONLY) ? | |
1350 | "read-only" : "read/write"); | |
1351 | err = -EBUSY; | |
1352 | goto failed_super; | |
1353 | } | |
e95c311e | 1354 | } else { |
f11459ad RK |
1355 | /* |
1356 | * Try remount to setup mount states if the current | |
1357 | * tree is not mounted and only snapshots use this sb. | |
1358 | */ | |
1359 | err = nilfs_remount(s, &flags, data); | |
1360 | if (err) | |
1361 | goto failed_super; | |
1362 | } | |
783f6184 RK |
1363 | } |
1364 | ||
f11459ad RK |
1365 | if (sd.cno) { |
1366 | err = nilfs_attach_snapshot(s, sd.cno, &root_dentry); | |
348fe8da | 1367 | if (err) |
f11459ad | 1368 | goto failed_super; |
f11459ad RK |
1369 | } else { |
1370 | root_dentry = dget(s->s_root); | |
783f6184 RK |
1371 | } |
1372 | ||
f11459ad | 1373 | if (!s_new) |
d4d77629 | 1374 | blkdev_put(sd.bdev, mode); |
783f6184 | 1375 | |
e4c59d61 | 1376 | return root_dentry; |
783f6184 | 1377 | |
f11459ad | 1378 | failed_super: |
a95161aa | 1379 | deactivate_locked_super(s); |
783f6184 | 1380 | |
348fe8da RK |
1381 | failed: |
1382 | if (!s_new) | |
d4d77629 | 1383 | blkdev_put(sd.bdev, mode); |
e4c59d61 | 1384 | return ERR_PTR(err); |
783f6184 RK |
1385 | } |
1386 | ||
783f6184 RK |
1387 | struct file_system_type nilfs_fs_type = { |
1388 | .owner = THIS_MODULE, | |
1389 | .name = "nilfs2", | |
e4c59d61 | 1390 | .mount = nilfs_mount, |
783f6184 RK |
1391 | .kill_sb = kill_block_super, |
1392 | .fs_flags = FS_REQUIRES_DEV, | |
1393 | }; | |
7f78e035 | 1394 | MODULE_ALIAS_FS("nilfs2"); |
783f6184 | 1395 | |
41c88bd7 | 1396 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1397 | { |
41c88bd7 | 1398 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1399 | |
41c88bd7 LH |
1400 | INIT_LIST_HEAD(&ii->i_dirty); |
1401 | #ifdef CONFIG_NILFS_XATTR | |
1402 | init_rwsem(&ii->xattr_sem); | |
1403 | #endif | |
2aa15890 | 1404 | address_space_init_once(&ii->i_btnode_cache); |
05d0e94b | 1405 | ii->i_bmap = &ii->i_bmap_data; |
41c88bd7 LH |
1406 | inode_init_once(&ii->vfs_inode); |
1407 | } | |
783f6184 | 1408 | |
41c88bd7 LH |
1409 | static void nilfs_segbuf_init_once(void *obj) |
1410 | { | |
1411 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1412 | } | |
783f6184 | 1413 | |
41c88bd7 LH |
1414 | static void nilfs_destroy_cachep(void) |
1415 | { | |
8c0a8537 KS |
1416 | /* |
1417 | * Make sure all delayed rcu free inodes are flushed before we | |
1418 | * destroy cache. | |
1419 | */ | |
1420 | rcu_barrier(); | |
1421 | ||
da80a39f JL |
1422 | kmem_cache_destroy(nilfs_inode_cachep); |
1423 | kmem_cache_destroy(nilfs_transaction_cachep); | |
1424 | kmem_cache_destroy(nilfs_segbuf_cachep); | |
1425 | kmem_cache_destroy(nilfs_btree_path_cache); | |
41c88bd7 | 1426 | } |
783f6184 | 1427 | |
41c88bd7 LH |
1428 | static int __init nilfs_init_cachep(void) |
1429 | { | |
1430 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1431 | sizeof(struct nilfs_inode_info), 0, | |
5d097056 VD |
1432 | SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, |
1433 | nilfs_inode_init_once); | |
41c88bd7 LH |
1434 | if (!nilfs_inode_cachep) |
1435 | goto fail; | |
1436 | ||
1437 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1438 | sizeof(struct nilfs_transaction_info), 0, | |
1439 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1440 | if (!nilfs_transaction_cachep) | |
1441 | goto fail; | |
1442 | ||
1443 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1444 | sizeof(struct nilfs_segment_buffer), 0, | |
1445 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1446 | if (!nilfs_segbuf_cachep) | |
1447 | goto fail; | |
1448 | ||
1449 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1450 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1451 | 0, 0, NULL); | |
1452 | if (!nilfs_btree_path_cache) | |
1453 | goto fail; | |
783f6184 RK |
1454 | |
1455 | return 0; | |
1456 | ||
41c88bd7 LH |
1457 | fail: |
1458 | nilfs_destroy_cachep(); | |
1459 | return -ENOMEM; | |
1460 | } | |
1461 | ||
1462 | static int __init init_nilfs_fs(void) | |
1463 | { | |
1464 | int err; | |
783f6184 | 1465 | |
41c88bd7 LH |
1466 | err = nilfs_init_cachep(); |
1467 | if (err) | |
1468 | goto fail; | |
783f6184 | 1469 | |
dd70edbd | 1470 | err = nilfs_sysfs_init(); |
41c88bd7 LH |
1471 | if (err) |
1472 | goto free_cachep; | |
783f6184 | 1473 | |
dd70edbd VD |
1474 | err = register_filesystem(&nilfs_fs_type); |
1475 | if (err) | |
1476 | goto deinit_sysfs_entry; | |
1477 | ||
9f130263 | 1478 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1479 | return 0; |
783f6184 | 1480 | |
dd70edbd VD |
1481 | deinit_sysfs_entry: |
1482 | nilfs_sysfs_exit(); | |
41c88bd7 LH |
1483 | free_cachep: |
1484 | nilfs_destroy_cachep(); | |
1485 | fail: | |
783f6184 RK |
1486 | return err; |
1487 | } | |
1488 | ||
1489 | static void __exit exit_nilfs_fs(void) | |
1490 | { | |
41c88bd7 | 1491 | nilfs_destroy_cachep(); |
dd70edbd | 1492 | nilfs_sysfs_exit(); |
783f6184 RK |
1493 | unregister_filesystem(&nilfs_fs_type); |
1494 | } | |
1495 | ||
1496 | module_init(init_nilfs_fs) | |
1497 | module_exit(exit_nilfs_fs) |