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