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 | |
d6517deb | 118 | * single-shot I/O error, nilfs_msg() should be used instead. |
cae3d4ca RK |
119 | * |
120 | * Callers should not add a trailing newline since this will do it. | |
783f6184 | 121 | */ |
cae3d4ca RK |
122 | void __nilfs_error(struct super_block *sb, const char *function, |
123 | const char *fmt, ...) | |
783f6184 | 124 | { |
e3154e97 | 125 | struct the_nilfs *nilfs = sb->s_fs_info; |
b004a5eb | 126 | struct va_format vaf; |
783f6184 RK |
127 | va_list args; |
128 | ||
129 | va_start(args, fmt); | |
b004a5eb JP |
130 | |
131 | vaf.fmt = fmt; | |
132 | vaf.va = &args; | |
133 | ||
134 | printk(KERN_CRIT "NILFS error (device %s): %s: %pV\n", | |
135 | sb->s_id, function, &vaf); | |
136 | ||
783f6184 RK |
137 | va_end(args); |
138 | ||
bc98a42c | 139 | if (!sb_rdonly(sb)) { |
f7545144 | 140 | nilfs_set_error(sb); |
783f6184 | 141 | |
3b2ce58b | 142 | if (nilfs_test_opt(nilfs, ERRORS_RO)) { |
783f6184 | 143 | printk(KERN_CRIT "Remounting filesystem read-only\n"); |
1751e8a6 | 144 | sb->s_flags |= SB_RDONLY; |
783f6184 RK |
145 | } |
146 | } | |
147 | ||
3b2ce58b | 148 | if (nilfs_test_opt(nilfs, ERRORS_PANIC)) |
783f6184 RK |
149 | panic("NILFS (device %s): panic forced after error\n", |
150 | sb->s_id); | |
151 | } | |
152 | ||
2879ed66 | 153 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
783f6184 RK |
154 | { |
155 | struct nilfs_inode_info *ii; | |
156 | ||
157 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); | |
158 | if (!ii) | |
159 | return NULL; | |
160 | ii->i_bh = NULL; | |
161 | ii->i_state = 0; | |
0e14a359 | 162 | ii->i_cno = 0; |
b83ae6d4 | 163 | nilfs_mapping_init(&ii->i_btnode_cache, &ii->vfs_inode); |
783f6184 RK |
164 | return &ii->vfs_inode; |
165 | } | |
166 | ||
fa0d7e3d | 167 | static void nilfs_i_callback(struct rcu_head *head) |
783f6184 | 168 | { |
fa0d7e3d | 169 | struct inode *inode = container_of(head, struct inode, i_rcu); |
b91c9a97 | 170 | |
2d19961d RK |
171 | if (nilfs_is_metadata_file_inode(inode)) |
172 | nilfs_mdt_destroy(inode); | |
173 | ||
783f6184 RK |
174 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
175 | } | |
176 | ||
fa0d7e3d NP |
177 | void nilfs_destroy_inode(struct inode *inode) |
178 | { | |
179 | call_rcu(&inode->i_rcu, nilfs_i_callback); | |
180 | } | |
181 | ||
f7545144 | 182 | static int nilfs_sync_super(struct super_block *sb, int flag) |
783f6184 | 183 | { |
e3154e97 | 184 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 185 | int err; |
783f6184 | 186 | |
783f6184 | 187 | retry: |
e339ad31 | 188 | set_buffer_dirty(nilfs->ns_sbh[0]); |
3b2ce58b | 189 | if (nilfs_test_opt(nilfs, BARRIER)) { |
87e99511 | 190 | err = __sync_dirty_buffer(nilfs->ns_sbh[0], |
70fd7614 | 191 | REQ_SYNC | REQ_PREFLUSH | REQ_FUA); |
87e99511 CH |
192 | } else { |
193 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); | |
783f6184 | 194 | } |
87e99511 | 195 | |
e339ad31 | 196 | if (unlikely(err)) { |
feee880f RK |
197 | nilfs_msg(sb, KERN_ERR, "unable to write superblock: err=%d", |
198 | err); | |
e339ad31 | 199 | if (err == -EIO && nilfs->ns_sbh[1]) { |
b2ac86e1 JS |
200 | /* |
201 | * sbp[0] points to newer log than sbp[1], | |
202 | * so copy sbp[0] to sbp[1] to take over sbp[0]. | |
203 | */ | |
204 | memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0], | |
205 | nilfs->ns_sbsize); | |
e339ad31 RK |
206 | nilfs_fall_back_super_block(nilfs); |
207 | goto retry; | |
208 | } | |
209 | } else { | |
210 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; | |
211 | ||
b2ac86e1 JS |
212 | nilfs->ns_sbwcount++; |
213 | ||
e339ad31 RK |
214 | /* |
215 | * The latest segment becomes trailable from the position | |
216 | * written in superblock. | |
217 | */ | |
783f6184 | 218 | clear_nilfs_discontinued(nilfs); |
e339ad31 RK |
219 | |
220 | /* update GC protection for recent segments */ | |
221 | if (nilfs->ns_sbh[1]) { | |
b2ac86e1 | 222 | if (flag == NILFS_SB_COMMIT_ALL) { |
e339ad31 | 223 | set_buffer_dirty(nilfs->ns_sbh[1]); |
b2ac86e1 JS |
224 | if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0) |
225 | goto out; | |
e339ad31 | 226 | } |
b2ac86e1 JS |
227 | if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) < |
228 | le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno)) | |
229 | sbp = nilfs->ns_sbp[1]; | |
e339ad31 | 230 | } |
783f6184 | 231 | |
b2ac86e1 JS |
232 | spin_lock(&nilfs->ns_last_segment_lock); |
233 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); | |
234 | spin_unlock(&nilfs->ns_last_segment_lock); | |
235 | } | |
236 | out: | |
783f6184 RK |
237 | return err; |
238 | } | |
239 | ||
60f46b7e RK |
240 | void nilfs_set_log_cursor(struct nilfs_super_block *sbp, |
241 | struct the_nilfs *nilfs) | |
242 | { | |
243 | sector_t nfreeblocks; | |
244 | ||
245 | /* nilfs->ns_sem must be locked by the caller. */ | |
246 | nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
247 | sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
248 | ||
249 | spin_lock(&nilfs->ns_last_segment_lock); | |
250 | sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
251 | sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
252 | sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
253 | spin_unlock(&nilfs->ns_last_segment_lock); | |
254 | } | |
255 | ||
f7545144 | 256 | struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb, |
b2ac86e1 | 257 | int flip) |
783f6184 | 258 | { |
e3154e97 | 259 | struct the_nilfs *nilfs = sb->s_fs_info; |
e339ad31 | 260 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 261 | |
d26493b6 | 262 | /* nilfs->ns_sem must be locked by the caller. */ |
34cb9b5c | 263 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
d26493b6 JS |
264 | if (sbp[1] && |
265 | sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
b2ac86e1 | 266 | memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); |
d26493b6 | 267 | } else { |
feee880f | 268 | nilfs_msg(sb, KERN_CRIT, "superblock broke"); |
d26493b6 | 269 | return NULL; |
e339ad31 | 270 | } |
b2ac86e1 JS |
271 | } else if (sbp[1] && |
272 | sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
7592ecde | 273 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); |
e339ad31 | 274 | } |
b2ac86e1 JS |
275 | |
276 | if (flip && sbp[1]) | |
277 | nilfs_swap_super_block(nilfs); | |
278 | ||
d26493b6 JS |
279 | return sbp; |
280 | } | |
281 | ||
f7545144 | 282 | int nilfs_commit_super(struct super_block *sb, int flag) |
d26493b6 | 283 | { |
e3154e97 | 284 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 JS |
285 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
286 | time_t t; | |
287 | ||
288 | /* nilfs->ns_sem must be locked by the caller. */ | |
e339ad31 | 289 | t = get_seconds(); |
b2ac86e1 | 290 | nilfs->ns_sbwtime = t; |
e339ad31 RK |
291 | sbp[0]->s_wtime = cpu_to_le64(t); |
292 | sbp[0]->s_sum = 0; | |
293 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
294 | (unsigned char *)sbp[0], | |
295 | nilfs->ns_sbsize)); | |
b2ac86e1 JS |
296 | if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) { |
297 | sbp[1]->s_wtime = sbp[0]->s_wtime; | |
298 | sbp[1]->s_sum = 0; | |
299 | sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
300 | (unsigned char *)sbp[1], | |
301 | nilfs->ns_sbsize)); | |
e339ad31 | 302 | } |
e605f0a7 | 303 | clear_nilfs_sb_dirty(nilfs); |
e2c7617a AR |
304 | nilfs->ns_flushed_device = 1; |
305 | /* make sure store to ns_flushed_device cannot be reordered */ | |
306 | smp_wmb(); | |
f7545144 | 307 | return nilfs_sync_super(sb, flag); |
783f6184 RK |
308 | } |
309 | ||
7ecaa46c RK |
310 | /** |
311 | * nilfs_cleanup_super() - write filesystem state for cleanup | |
f7545144 | 312 | * @sb: super block instance to be unmounted or degraded to read-only |
7ecaa46c RK |
313 | * |
314 | * This function restores state flags in the on-disk super block. | |
315 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the | |
316 | * filesystem was not clean previously. | |
317 | */ | |
f7545144 | 318 | int nilfs_cleanup_super(struct super_block *sb) |
7ecaa46c | 319 | { |
e3154e97 | 320 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 321 | struct nilfs_super_block **sbp; |
b2ac86e1 | 322 | int flag = NILFS_SB_COMMIT; |
d26493b6 | 323 | int ret = -EIO; |
7ecaa46c | 324 | |
f7545144 | 325 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 | 326 | if (sbp) { |
f7545144 RK |
327 | sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state); |
328 | nilfs_set_log_cursor(sbp[0], nilfs); | |
b2ac86e1 JS |
329 | if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { |
330 | /* | |
331 | * make the "clean" flag also to the opposite | |
332 | * super block if both super blocks point to | |
333 | * the same checkpoint. | |
334 | */ | |
335 | sbp[1]->s_state = sbp[0]->s_state; | |
336 | flag = NILFS_SB_COMMIT_ALL; | |
337 | } | |
f7545144 | 338 | ret = nilfs_commit_super(sb, flag); |
d26493b6 | 339 | } |
7ecaa46c RK |
340 | return ret; |
341 | } | |
342 | ||
cfb0a4bf RK |
343 | /** |
344 | * nilfs_move_2nd_super - relocate secondary super block | |
345 | * @sb: super block instance | |
346 | * @sb2off: new offset of the secondary super block (in bytes) | |
347 | */ | |
348 | static int nilfs_move_2nd_super(struct super_block *sb, loff_t sb2off) | |
349 | { | |
350 | struct the_nilfs *nilfs = sb->s_fs_info; | |
351 | struct buffer_head *nsbh; | |
352 | struct nilfs_super_block *nsbp; | |
353 | sector_t blocknr, newblocknr; | |
354 | unsigned long offset; | |
4f05028f | 355 | int sb2i; /* array index of the secondary superblock */ |
cfb0a4bf RK |
356 | int ret = 0; |
357 | ||
358 | /* nilfs->ns_sem must be locked by the caller. */ | |
359 | if (nilfs->ns_sbh[1] && | |
360 | nilfs->ns_sbh[1]->b_blocknr > nilfs->ns_first_data_block) { | |
361 | sb2i = 1; | |
362 | blocknr = nilfs->ns_sbh[1]->b_blocknr; | |
363 | } else if (nilfs->ns_sbh[0]->b_blocknr > nilfs->ns_first_data_block) { | |
364 | sb2i = 0; | |
365 | blocknr = nilfs->ns_sbh[0]->b_blocknr; | |
4f05028f RK |
366 | } else { |
367 | sb2i = -1; | |
368 | blocknr = 0; | |
cfb0a4bf RK |
369 | } |
370 | if (sb2i >= 0 && (u64)blocknr << nilfs->ns_blocksize_bits == sb2off) | |
371 | goto out; /* super block location is unchanged */ | |
372 | ||
373 | /* Get new super block buffer */ | |
374 | newblocknr = sb2off >> nilfs->ns_blocksize_bits; | |
375 | offset = sb2off & (nilfs->ns_blocksize - 1); | |
376 | nsbh = sb_getblk(sb, newblocknr); | |
377 | if (!nsbh) { | |
feee880f RK |
378 | nilfs_msg(sb, KERN_WARNING, |
379 | "unable to move secondary superblock to block %llu", | |
380 | (unsigned long long)newblocknr); | |
cfb0a4bf RK |
381 | ret = -EIO; |
382 | goto out; | |
383 | } | |
384 | nsbp = (void *)nsbh->b_data + offset; | |
385 | memset(nsbp, 0, nilfs->ns_blocksize); | |
386 | ||
387 | if (sb2i >= 0) { | |
388 | memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize); | |
389 | brelse(nilfs->ns_sbh[sb2i]); | |
390 | nilfs->ns_sbh[sb2i] = nsbh; | |
391 | nilfs->ns_sbp[sb2i] = nsbp; | |
392 | } else if (nilfs->ns_sbh[0]->b_blocknr < nilfs->ns_first_data_block) { | |
393 | /* secondary super block will be restored to index 1 */ | |
394 | nilfs->ns_sbh[1] = nsbh; | |
395 | nilfs->ns_sbp[1] = nsbp; | |
396 | } else { | |
397 | brelse(nsbh); | |
398 | } | |
399 | out: | |
400 | return ret; | |
401 | } | |
402 | ||
4e33f9ea RK |
403 | /** |
404 | * nilfs_resize_fs - resize the filesystem | |
405 | * @sb: super block instance | |
406 | * @newsize: new size of the filesystem (in bytes) | |
407 | */ | |
408 | int nilfs_resize_fs(struct super_block *sb, __u64 newsize) | |
409 | { | |
410 | struct the_nilfs *nilfs = sb->s_fs_info; | |
411 | struct nilfs_super_block **sbp; | |
412 | __u64 devsize, newnsegs; | |
413 | loff_t sb2off; | |
414 | int ret; | |
415 | ||
416 | ret = -ERANGE; | |
417 | devsize = i_size_read(sb->s_bdev->bd_inode); | |
418 | if (newsize > devsize) | |
419 | goto out; | |
420 | ||
421 | /* | |
422 | * Write lock is required to protect some functions depending | |
423 | * on the number of segments, the number of reserved segments, | |
424 | * and so forth. | |
425 | */ | |
426 | down_write(&nilfs->ns_segctor_sem); | |
427 | ||
428 | sb2off = NILFS_SB2_OFFSET_BYTES(newsize); | |
429 | newnsegs = sb2off >> nilfs->ns_blocksize_bits; | |
430 | do_div(newnsegs, nilfs->ns_blocks_per_segment); | |
431 | ||
432 | ret = nilfs_sufile_resize(nilfs->ns_sufile, newnsegs); | |
433 | up_write(&nilfs->ns_segctor_sem); | |
434 | if (ret < 0) | |
435 | goto out; | |
436 | ||
437 | ret = nilfs_construct_segment(sb); | |
438 | if (ret < 0) | |
439 | goto out; | |
440 | ||
441 | down_write(&nilfs->ns_sem); | |
442 | nilfs_move_2nd_super(sb, sb2off); | |
443 | ret = -EIO; | |
444 | sbp = nilfs_prepare_super(sb, 0); | |
445 | if (likely(sbp)) { | |
446 | nilfs_set_log_cursor(sbp[0], nilfs); | |
447 | /* | |
448 | * Drop NILFS_RESIZE_FS flag for compatibility with | |
449 | * mount-time resize which may be implemented in a | |
450 | * future release. | |
451 | */ | |
452 | sbp[0]->s_state = cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & | |
453 | ~NILFS_RESIZE_FS); | |
454 | sbp[0]->s_dev_size = cpu_to_le64(newsize); | |
455 | sbp[0]->s_nsegments = cpu_to_le64(nilfs->ns_nsegments); | |
456 | if (sbp[1]) | |
457 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
458 | ret = nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); | |
459 | } | |
460 | up_write(&nilfs->ns_sem); | |
461 | ||
462 | /* | |
463 | * Reset the range of allocatable segments last. This order | |
464 | * is important in the case of expansion because the secondary | |
465 | * superblock must be protected from log write until migration | |
466 | * completes. | |
467 | */ | |
468 | if (!ret) | |
469 | nilfs_sufile_set_alloc_range(nilfs->ns_sufile, 0, newnsegs - 1); | |
470 | out: | |
471 | return ret; | |
472 | } | |
473 | ||
783f6184 RK |
474 | static void nilfs_put_super(struct super_block *sb) |
475 | { | |
e3154e97 | 476 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 477 | |
f7545144 | 478 | nilfs_detach_log_writer(sb); |
783f6184 | 479 | |
bc98a42c | 480 | if (!sb_rdonly(sb)) { |
783f6184 | 481 | down_write(&nilfs->ns_sem); |
f7545144 | 482 | nilfs_cleanup_super(sb); |
783f6184 RK |
483 | up_write(&nilfs->ns_sem); |
484 | } | |
485 | ||
f1e89c86 RK |
486 | iput(nilfs->ns_sufile); |
487 | iput(nilfs->ns_cpfile); | |
488 | iput(nilfs->ns_dat); | |
489 | ||
348fe8da | 490 | destroy_nilfs(nilfs); |
783f6184 | 491 | sb->s_fs_info = NULL; |
783f6184 RK |
492 | } |
493 | ||
783f6184 RK |
494 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
495 | { | |
e3154e97 | 496 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 497 | struct nilfs_super_block **sbp; |
783f6184 RK |
498 | int err = 0; |
499 | ||
500 | /* This function is called when super block should be written back */ | |
501 | if (wait) | |
502 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
503 | |
504 | down_write(&nilfs->ns_sem); | |
d26493b6 | 505 | if (nilfs_sb_dirty(nilfs)) { |
f7545144 | 506 | sbp = nilfs_prepare_super(sb, nilfs_sb_will_flip(nilfs)); |
b2ac86e1 JS |
507 | if (likely(sbp)) { |
508 | nilfs_set_log_cursor(sbp[0], nilfs); | |
f7545144 | 509 | nilfs_commit_super(sb, NILFS_SB_COMMIT); |
b2ac86e1 | 510 | } |
d26493b6 | 511 | } |
6233caa9 JS |
512 | up_write(&nilfs->ns_sem); |
513 | ||
e2c7617a AR |
514 | if (!err) |
515 | err = nilfs_flush_device(nilfs); | |
516 | ||
783f6184 RK |
517 | return err; |
518 | } | |
519 | ||
f7545144 | 520 | int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt, |
4d8d9293 | 521 | struct nilfs_root **rootp) |
783f6184 | 522 | { |
e3154e97 | 523 | struct the_nilfs *nilfs = sb->s_fs_info; |
4d8d9293 | 524 | struct nilfs_root *root; |
783f6184 RK |
525 | struct nilfs_checkpoint *raw_cp; |
526 | struct buffer_head *bh_cp; | |
4d8d9293 | 527 | int err = -ENOMEM; |
783f6184 | 528 | |
4d8d9293 RK |
529 | root = nilfs_find_or_create_root( |
530 | nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); | |
531 | if (!root) | |
532 | return err; | |
783f6184 | 533 | |
e912a5b6 RK |
534 | if (root->ifile) |
535 | goto reuse; /* already attached checkpoint */ | |
783f6184 | 536 | |
1154ecbd | 537 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
538 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
539 | &bh_cp); | |
1154ecbd | 540 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
541 | if (unlikely(err)) { |
542 | if (err == -ENOENT || err == -EINVAL) { | |
feee880f RK |
543 | nilfs_msg(sb, KERN_ERR, |
544 | "Invalid checkpoint (checkpoint number=%llu)", | |
545 | (unsigned long long)cno); | |
783f6184 RK |
546 | err = -EINVAL; |
547 | } | |
548 | goto failed; | |
549 | } | |
f1e89c86 | 550 | |
f7545144 | 551 | err = nilfs_ifile_read(sb, root, nilfs->ns_inode_size, |
f1e89c86 RK |
552 | &raw_cp->cp_ifile_inode, &root->ifile); |
553 | if (err) | |
783f6184 | 554 | goto failed_bh; |
b7c06342 | 555 | |
e5f7f848 VD |
556 | atomic64_set(&root->inodes_count, |
557 | le64_to_cpu(raw_cp->cp_inodes_count)); | |
558 | atomic64_set(&root->blocks_count, | |
559 | le64_to_cpu(raw_cp->cp_blocks_count)); | |
783f6184 RK |
560 | |
561 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
4d8d9293 | 562 | |
e912a5b6 | 563 | reuse: |
4d8d9293 | 564 | *rootp = root; |
783f6184 RK |
565 | return 0; |
566 | ||
567 | failed_bh: | |
568 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
569 | failed: | |
4d8d9293 | 570 | nilfs_put_root(root); |
783f6184 RK |
571 | |
572 | return err; | |
573 | } | |
783f6184 | 574 | |
5beb6e0b RK |
575 | static int nilfs_freeze(struct super_block *sb) |
576 | { | |
e3154e97 | 577 | struct the_nilfs *nilfs = sb->s_fs_info; |
5beb6e0b RK |
578 | int err; |
579 | ||
bc98a42c | 580 | if (sb_rdonly(sb)) |
5beb6e0b | 581 | return 0; |
783f6184 | 582 | |
5beb6e0b RK |
583 | /* Mark super block clean */ |
584 | down_write(&nilfs->ns_sem); | |
f7545144 | 585 | err = nilfs_cleanup_super(sb); |
5beb6e0b | 586 | up_write(&nilfs->ns_sem); |
783f6184 RK |
587 | return err; |
588 | } | |
589 | ||
5beb6e0b | 590 | static int nilfs_unfreeze(struct super_block *sb) |
783f6184 | 591 | { |
e3154e97 | 592 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 593 | |
bc98a42c | 594 | if (sb_rdonly(sb)) |
5beb6e0b RK |
595 | return 0; |
596 | ||
597 | down_write(&nilfs->ns_sem); | |
f7545144 | 598 | nilfs_setup_super(sb, false); |
5beb6e0b RK |
599 | up_write(&nilfs->ns_sem); |
600 | return 0; | |
783f6184 RK |
601 | } |
602 | ||
783f6184 RK |
603 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
604 | { | |
605 | struct super_block *sb = dentry->d_sb; | |
2b0143b5 | 606 | struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root; |
b7c06342 | 607 | struct the_nilfs *nilfs = root->nilfs; |
c306af23 | 608 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
783f6184 RK |
609 | unsigned long long blocks; |
610 | unsigned long overhead; | |
611 | unsigned long nrsvblocks; | |
612 | sector_t nfreeblocks; | |
c7ef972c | 613 | u64 nmaxinodes, nfreeinodes; |
783f6184 RK |
614 | int err; |
615 | ||
616 | /* | |
617 | * Compute all of the segment blocks | |
618 | * | |
619 | * The blocks before first segment and after last segment | |
620 | * are excluded. | |
621 | */ | |
622 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
623 | - nilfs->ns_first_data_block; | |
624 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
625 | ||
626 | /* | |
627 | * Compute the overhead | |
628 | * | |
7a65004b | 629 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
630 | * We must count them as the overhead. |
631 | */ | |
632 | overhead = 0; | |
633 | ||
634 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
635 | if (unlikely(err)) | |
636 | return err; | |
637 | ||
c7ef972c VD |
638 | err = nilfs_ifile_count_free_inodes(root->ifile, |
639 | &nmaxinodes, &nfreeinodes); | |
640 | if (unlikely(err)) { | |
feee880f RK |
641 | nilfs_msg(sb, KERN_WARNING, |
642 | "failed to count free inodes: err=%d", err); | |
c7ef972c VD |
643 | if (err == -ERANGE) { |
644 | /* | |
645 | * If nilfs_palloc_count_max_entries() returns | |
646 | * -ERANGE error code then we simply treat | |
647 | * curent inodes count as maximum possible and | |
648 | * zero as free inodes value. | |
649 | */ | |
e5f7f848 | 650 | nmaxinodes = atomic64_read(&root->inodes_count); |
c7ef972c VD |
651 | nfreeinodes = 0; |
652 | err = 0; | |
653 | } else | |
654 | return err; | |
655 | } | |
656 | ||
783f6184 RK |
657 | buf->f_type = NILFS_SUPER_MAGIC; |
658 | buf->f_bsize = sb->s_blocksize; | |
659 | buf->f_blocks = blocks - overhead; | |
660 | buf->f_bfree = nfreeblocks; | |
661 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
662 | (buf->f_bfree - nrsvblocks) : 0; | |
c7ef972c VD |
663 | buf->f_files = nmaxinodes; |
664 | buf->f_ffree = nfreeinodes; | |
783f6184 | 665 | buf->f_namelen = NILFS_NAME_LEN; |
c306af23 RK |
666 | buf->f_fsid.val[0] = (u32)id; |
667 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
668 | ||
783f6184 RK |
669 | return 0; |
670 | } | |
671 | ||
34c80b1d | 672 | static int nilfs_show_options(struct seq_file *seq, struct dentry *dentry) |
b58a285b | 673 | { |
34c80b1d | 674 | struct super_block *sb = dentry->d_sb; |
e3154e97 | 675 | struct the_nilfs *nilfs = sb->s_fs_info; |
2b0143b5 | 676 | struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root; |
b58a285b | 677 | |
3b2ce58b | 678 | if (!nilfs_test_opt(nilfs, BARRIER)) |
c6b4d57d | 679 | seq_puts(seq, ",nobarrier"); |
f11459ad RK |
680 | if (root->cno != NILFS_CPTREE_CURRENT_CNO) |
681 | seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno); | |
3b2ce58b | 682 | if (nilfs_test_opt(nilfs, ERRORS_PANIC)) |
c6b4d57d | 683 | seq_puts(seq, ",errors=panic"); |
3b2ce58b | 684 | if (nilfs_test_opt(nilfs, ERRORS_CONT)) |
c6b4d57d | 685 | seq_puts(seq, ",errors=continue"); |
3b2ce58b | 686 | if (nilfs_test_opt(nilfs, STRICT_ORDER)) |
c6b4d57d | 687 | seq_puts(seq, ",order=strict"); |
3b2ce58b | 688 | if (nilfs_test_opt(nilfs, NORECOVERY)) |
c6b4d57d | 689 | seq_puts(seq, ",norecovery"); |
3b2ce58b | 690 | if (nilfs_test_opt(nilfs, DISCARD)) |
c6b4d57d | 691 | seq_puts(seq, ",discard"); |
b58a285b JS |
692 | |
693 | return 0; | |
694 | } | |
695 | ||
b87221de | 696 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
697 | .alloc_inode = nilfs_alloc_inode, |
698 | .destroy_inode = nilfs_destroy_inode, | |
699 | .dirty_inode = nilfs_dirty_inode, | |
6fd1e5c9 | 700 | .evict_inode = nilfs_evict_inode, |
783f6184 | 701 | .put_super = nilfs_put_super, |
783f6184 | 702 | .sync_fs = nilfs_sync_fs, |
5beb6e0b RK |
703 | .freeze_fs = nilfs_freeze, |
704 | .unfreeze_fs = nilfs_unfreeze, | |
783f6184 RK |
705 | .statfs = nilfs_statfs, |
706 | .remount_fs = nilfs_remount, | |
b58a285b | 707 | .show_options = nilfs_show_options |
783f6184 RK |
708 | }; |
709 | ||
783f6184 RK |
710 | enum { |
711 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
773bc4f3 | 712 | Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
802d3177 | 713 | Opt_discard, Opt_nodiscard, Opt_err, |
783f6184 RK |
714 | }; |
715 | ||
716 | static match_table_t tokens = { | |
717 | {Opt_err_cont, "errors=continue"}, | |
718 | {Opt_err_panic, "errors=panic"}, | |
719 | {Opt_err_ro, "errors=remount-ro"}, | |
773bc4f3 | 720 | {Opt_barrier, "barrier"}, |
91f1953b | 721 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
722 | {Opt_snapshot, "cp=%u"}, |
723 | {Opt_order, "order=%s"}, | |
0234576d | 724 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 725 | {Opt_discard, "discard"}, |
802d3177 | 726 | {Opt_nodiscard, "nodiscard"}, |
783f6184 RK |
727 | {Opt_err, NULL} |
728 | }; | |
729 | ||
7c017457 | 730 | static int parse_options(char *options, struct super_block *sb, int is_remount) |
783f6184 | 731 | { |
e3154e97 | 732 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 RK |
733 | char *p; |
734 | substring_t args[MAX_OPT_ARGS]; | |
783f6184 RK |
735 | |
736 | if (!options) | |
737 | return 1; | |
738 | ||
739 | while ((p = strsep(&options, ",")) != NULL) { | |
740 | int token; | |
4ad364ca | 741 | |
783f6184 RK |
742 | if (!*p) |
743 | continue; | |
744 | ||
745 | token = match_token(p, tokens, args); | |
746 | switch (token) { | |
773bc4f3 | 747 | case Opt_barrier: |
3b2ce58b | 748 | nilfs_set_opt(nilfs, BARRIER); |
773bc4f3 | 749 | break; |
91f1953b | 750 | case Opt_nobarrier: |
3b2ce58b | 751 | nilfs_clear_opt(nilfs, BARRIER); |
783f6184 RK |
752 | break; |
753 | case Opt_order: | |
754 | if (strcmp(args[0].from, "relaxed") == 0) | |
755 | /* Ordered data semantics */ | |
3b2ce58b | 756 | nilfs_clear_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
757 | else if (strcmp(args[0].from, "strict") == 0) |
758 | /* Strict in-order semantics */ | |
3b2ce58b | 759 | nilfs_set_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
760 | else |
761 | return 0; | |
762 | break; | |
763 | case Opt_err_panic: | |
3b2ce58b | 764 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC); |
783f6184 RK |
765 | break; |
766 | case Opt_err_ro: | |
3b2ce58b | 767 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO); |
783f6184 RK |
768 | break; |
769 | case Opt_err_cont: | |
3b2ce58b | 770 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT); |
783f6184 RK |
771 | break; |
772 | case Opt_snapshot: | |
7c017457 | 773 | if (is_remount) { |
feee880f RK |
774 | nilfs_msg(sb, KERN_ERR, |
775 | "\"%s\" option is invalid for remount", | |
776 | p); | |
783f6184 | 777 | return 0; |
7c017457 | 778 | } |
783f6184 | 779 | break; |
0234576d | 780 | case Opt_norecovery: |
3b2ce58b | 781 | nilfs_set_opt(nilfs, NORECOVERY); |
0234576d | 782 | break; |
e902ec99 | 783 | case Opt_discard: |
3b2ce58b | 784 | nilfs_set_opt(nilfs, DISCARD); |
e902ec99 | 785 | break; |
802d3177 | 786 | case Opt_nodiscard: |
3b2ce58b | 787 | nilfs_clear_opt(nilfs, DISCARD); |
802d3177 | 788 | break; |
783f6184 | 789 | default: |
feee880f RK |
790 | nilfs_msg(sb, KERN_ERR, |
791 | "unrecognized mount option \"%s\"", p); | |
783f6184 RK |
792 | return 0; |
793 | } | |
794 | } | |
795 | return 1; | |
796 | } | |
797 | ||
798 | static inline void | |
3b2ce58b | 799 | nilfs_set_default_options(struct super_block *sb, |
783f6184 RK |
800 | struct nilfs_super_block *sbp) |
801 | { | |
e3154e97 | 802 | struct the_nilfs *nilfs = sb->s_fs_info; |
3b2ce58b RK |
803 | |
804 | nilfs->ns_mount_opt = | |
277a6a34 | 805 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
806 | } |
807 | ||
f7545144 | 808 | static int nilfs_setup_super(struct super_block *sb, int is_mount) |
783f6184 | 809 | { |
e3154e97 | 810 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 JS |
811 | struct nilfs_super_block **sbp; |
812 | int max_mnt_count; | |
813 | int mnt_count; | |
814 | ||
815 | /* nilfs->ns_sem must be locked by the caller. */ | |
f7545144 | 816 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 JS |
817 | if (!sbp) |
818 | return -EIO; | |
819 | ||
5beb6e0b RK |
820 | if (!is_mount) |
821 | goto skip_mount_setup; | |
822 | ||
d26493b6 JS |
823 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); |
824 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); | |
783f6184 | 825 | |
f50a4c81 | 826 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
feee880f | 827 | nilfs_msg(sb, KERN_WARNING, "mounting fs with errors"); |
783f6184 RK |
828 | #if 0 |
829 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
feee880f | 830 | nilfs_msg(sb, KERN_WARNING, "maximal mount count reached"); |
783f6184 RK |
831 | #endif |
832 | } | |
833 | if (!max_mnt_count) | |
d26493b6 | 834 | sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
783f6184 | 835 | |
d26493b6 | 836 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
5beb6e0b RK |
837 | sbp[0]->s_mtime = cpu_to_le64(get_seconds()); |
838 | ||
839 | skip_mount_setup: | |
d26493b6 JS |
840 | sbp[0]->s_state = |
841 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); | |
b2ac86e1 | 842 | /* synchronize sbp[1] with sbp[0] */ |
0ca7a5b9 RK |
843 | if (sbp[1]) |
844 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
f7545144 | 845 | return nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); |
783f6184 RK |
846 | } |
847 | ||
e339ad31 RK |
848 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
849 | u64 pos, int blocksize, | |
850 | struct buffer_head **pbh) | |
783f6184 | 851 | { |
e339ad31 RK |
852 | unsigned long long sb_index = pos; |
853 | unsigned long offset; | |
783f6184 | 854 | |
e339ad31 | 855 | offset = do_div(sb_index, blocksize); |
783f6184 | 856 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 857 | if (!*pbh) |
783f6184 | 858 | return NULL; |
783f6184 RK |
859 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
860 | } | |
861 | ||
783f6184 RK |
862 | int nilfs_store_magic_and_option(struct super_block *sb, |
863 | struct nilfs_super_block *sbp, | |
864 | char *data) | |
865 | { | |
e3154e97 | 866 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 867 | |
783f6184 RK |
868 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
869 | ||
870 | /* FS independent flags */ | |
871 | #ifdef NILFS_ATIME_DISABLE | |
1751e8a6 | 872 | sb->s_flags |= SB_NOATIME; |
783f6184 RK |
873 | #endif |
874 | ||
3b2ce58b | 875 | nilfs_set_default_options(sb, sbp); |
783f6184 | 876 | |
574e6c31 RK |
877 | nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid); |
878 | nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid); | |
879 | nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval); | |
880 | nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max); | |
783f6184 | 881 | |
c9cb9b5c | 882 | return !parse_options(data, sb, 0) ? -EINVAL : 0; |
783f6184 RK |
883 | } |
884 | ||
c5ca48aa RK |
885 | int nilfs_check_feature_compatibility(struct super_block *sb, |
886 | struct nilfs_super_block *sbp) | |
887 | { | |
888 | __u64 features; | |
889 | ||
890 | features = le64_to_cpu(sbp->s_feature_incompat) & | |
891 | ~NILFS_FEATURE_INCOMPAT_SUPP; | |
892 | if (features) { | |
feee880f RK |
893 | nilfs_msg(sb, KERN_ERR, |
894 | "couldn't mount because of unsupported optional features (%llx)", | |
895 | (unsigned long long)features); | |
c5ca48aa RK |
896 | return -EINVAL; |
897 | } | |
898 | features = le64_to_cpu(sbp->s_feature_compat_ro) & | |
899 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
bc98a42c | 900 | if (!sb_rdonly(sb) && features) { |
feee880f RK |
901 | nilfs_msg(sb, KERN_ERR, |
902 | "couldn't mount RDWR because of unsupported optional features (%llx)", | |
903 | (unsigned long long)features); | |
c5ca48aa RK |
904 | return -EINVAL; |
905 | } | |
906 | return 0; | |
907 | } | |
908 | ||
367ea334 RK |
909 | static int nilfs_get_root_dentry(struct super_block *sb, |
910 | struct nilfs_root *root, | |
911 | struct dentry **root_dentry) | |
912 | { | |
913 | struct inode *inode; | |
914 | struct dentry *dentry; | |
915 | int ret = 0; | |
916 | ||
917 | inode = nilfs_iget(sb, root, NILFS_ROOT_INO); | |
918 | if (IS_ERR(inode)) { | |
367ea334 | 919 | ret = PTR_ERR(inode); |
feee880f | 920 | nilfs_msg(sb, KERN_ERR, "error %d getting root inode", ret); |
367ea334 RK |
921 | goto out; |
922 | } | |
923 | if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { | |
924 | iput(inode); | |
feee880f | 925 | nilfs_msg(sb, KERN_ERR, "corrupt root inode"); |
367ea334 RK |
926 | ret = -EINVAL; |
927 | goto out; | |
928 | } | |
929 | ||
f11459ad RK |
930 | if (root->cno == NILFS_CPTREE_CURRENT_CNO) { |
931 | dentry = d_find_alias(inode); | |
932 | if (!dentry) { | |
48fde701 | 933 | dentry = d_make_root(inode); |
f11459ad | 934 | if (!dentry) { |
f11459ad RK |
935 | ret = -ENOMEM; |
936 | goto failed_dentry; | |
937 | } | |
938 | } else { | |
939 | iput(inode); | |
940 | } | |
941 | } else { | |
1a0a397e | 942 | dentry = d_obtain_root(inode); |
f11459ad RK |
943 | if (IS_ERR(dentry)) { |
944 | ret = PTR_ERR(dentry); | |
945 | goto failed_dentry; | |
946 | } | |
367ea334 RK |
947 | } |
948 | *root_dentry = dentry; | |
949 | out: | |
950 | return ret; | |
f11459ad RK |
951 | |
952 | failed_dentry: | |
feee880f | 953 | nilfs_msg(sb, KERN_ERR, "error %d getting root dentry", ret); |
f11459ad | 954 | goto out; |
367ea334 RK |
955 | } |
956 | ||
ab4d8f7e RK |
957 | static int nilfs_attach_snapshot(struct super_block *s, __u64 cno, |
958 | struct dentry **root_dentry) | |
959 | { | |
e3154e97 | 960 | struct the_nilfs *nilfs = s->s_fs_info; |
ab4d8f7e RK |
961 | struct nilfs_root *root; |
962 | int ret; | |
963 | ||
572d8b39 RK |
964 | mutex_lock(&nilfs->ns_snapshot_mount_mutex); |
965 | ||
ab4d8f7e RK |
966 | down_read(&nilfs->ns_segctor_sem); |
967 | ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno); | |
968 | up_read(&nilfs->ns_segctor_sem); | |
969 | if (ret < 0) { | |
970 | ret = (ret == -ENOENT) ? -EINVAL : ret; | |
971 | goto out; | |
972 | } else if (!ret) { | |
feee880f RK |
973 | nilfs_msg(s, KERN_ERR, |
974 | "The specified checkpoint is not a snapshot (checkpoint number=%llu)", | |
975 | (unsigned long long)cno); | |
ab4d8f7e RK |
976 | ret = -EINVAL; |
977 | goto out; | |
978 | } | |
979 | ||
f7545144 | 980 | ret = nilfs_attach_checkpoint(s, cno, false, &root); |
ab4d8f7e | 981 | if (ret) { |
feee880f RK |
982 | nilfs_msg(s, KERN_ERR, |
983 | "error %d while loading snapshot (checkpoint number=%llu)", | |
984 | ret, (unsigned long long)cno); | |
ab4d8f7e RK |
985 | goto out; |
986 | } | |
987 | ret = nilfs_get_root_dentry(s, root, root_dentry); | |
988 | nilfs_put_root(root); | |
989 | out: | |
572d8b39 | 990 | mutex_unlock(&nilfs->ns_snapshot_mount_mutex); |
ab4d8f7e RK |
991 | return ret; |
992 | } | |
993 | ||
f11459ad | 994 | /** |
e95c311e | 995 | * nilfs_tree_is_busy() - try to shrink dentries of a checkpoint |
f11459ad RK |
996 | * @root_dentry: root dentry of the tree to be shrunk |
997 | * | |
998 | * This function returns true if the tree was in-use. | |
999 | */ | |
e95c311e | 1000 | static bool nilfs_tree_is_busy(struct dentry *root_dentry) |
f11459ad | 1001 | { |
f11459ad | 1002 | shrink_dcache_parent(root_dentry); |
e95c311e | 1003 | return d_count(root_dentry) > 1; |
f11459ad RK |
1004 | } |
1005 | ||
032dbb3b RK |
1006 | int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno) |
1007 | { | |
e3154e97 | 1008 | struct the_nilfs *nilfs = sb->s_fs_info; |
032dbb3b RK |
1009 | struct nilfs_root *root; |
1010 | struct inode *inode; | |
1011 | struct dentry *dentry; | |
1012 | int ret; | |
1013 | ||
3377f843 | 1014 | if (cno > nilfs->ns_cno) |
032dbb3b RK |
1015 | return false; |
1016 | ||
1017 | if (cno >= nilfs_last_cno(nilfs)) | |
1018 | return true; /* protect recent checkpoints */ | |
1019 | ||
1020 | ret = false; | |
e3154e97 | 1021 | root = nilfs_lookup_root(nilfs, cno); |
032dbb3b RK |
1022 | if (root) { |
1023 | inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO); | |
1024 | if (inode) { | |
1025 | dentry = d_find_alias(inode); | |
1026 | if (dentry) { | |
e95c311e | 1027 | ret = nilfs_tree_is_busy(dentry); |
032dbb3b RK |
1028 | dput(dentry); |
1029 | } | |
1030 | iput(inode); | |
1031 | } | |
1032 | nilfs_put_root(root); | |
1033 | } | |
1034 | return ret; | |
1035 | } | |
1036 | ||
783f6184 RK |
1037 | /** |
1038 | * nilfs_fill_super() - initialize a super block instance | |
1039 | * @sb: super_block | |
1040 | * @data: mount options | |
1041 | * @silent: silent mode flag | |
783f6184 | 1042 | * |
aa7dfb89 | 1043 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
1044 | * So, the recovery process is protected from other simultaneous mounts. |
1045 | */ | |
1046 | static int | |
348fe8da | 1047 | nilfs_fill_super(struct super_block *sb, void *data, int silent) |
783f6184 | 1048 | { |
348fe8da | 1049 | struct the_nilfs *nilfs; |
4d8d9293 | 1050 | struct nilfs_root *fsroot; |
783f6184 RK |
1051 | __u64 cno; |
1052 | int err; | |
1053 | ||
6625689e | 1054 | nilfs = alloc_nilfs(sb); |
e3154e97 | 1055 | if (!nilfs) |
783f6184 RK |
1056 | return -ENOMEM; |
1057 | ||
e3154e97 | 1058 | sb->s_fs_info = nilfs; |
783f6184 | 1059 | |
f7545144 | 1060 | err = init_nilfs(nilfs, sb, (char *)data); |
783f6184 | 1061 | if (err) |
348fe8da | 1062 | goto failed_nilfs; |
783f6184 | 1063 | |
783f6184 RK |
1064 | sb->s_op = &nilfs_sops; |
1065 | sb->s_export_op = &nilfs_export_ops; | |
1066 | sb->s_root = NULL; | |
61239230 | 1067 | sb->s_time_gran = 1; |
8de52778 | 1068 | sb->s_max_links = NILFS_LINK_MAX; |
026a7d63 | 1069 | |
0546c537 | 1070 | sb->s_bdi = bdi_get(sb->s_bdev->bd_bdi); |
783f6184 | 1071 | |
f7545144 | 1072 | err = load_nilfs(nilfs, sb); |
f50a4c81 | 1073 | if (err) |
348fe8da | 1074 | goto failed_nilfs; |
f50a4c81 | 1075 | |
783f6184 | 1076 | cno = nilfs_last_cno(nilfs); |
f7545144 | 1077 | err = nilfs_attach_checkpoint(sb, cno, true, &fsroot); |
783f6184 | 1078 | if (err) { |
feee880f RK |
1079 | nilfs_msg(sb, KERN_ERR, |
1080 | "error %d while loading last checkpoint (checkpoint number=%llu)", | |
1081 | err, (unsigned long long)cno); | |
f1e89c86 | 1082 | goto failed_unload; |
783f6184 RK |
1083 | } |
1084 | ||
bc98a42c | 1085 | if (!sb_rdonly(sb)) { |
f7545144 | 1086 | err = nilfs_attach_log_writer(sb, fsroot); |
783f6184 RK |
1087 | if (err) |
1088 | goto failed_checkpoint; | |
1089 | } | |
1090 | ||
367ea334 RK |
1091 | err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root); |
1092 | if (err) | |
783f6184 | 1093 | goto failed_segctor; |
783f6184 | 1094 | |
4d8d9293 | 1095 | nilfs_put_root(fsroot); |
783f6184 | 1096 | |
bc98a42c | 1097 | if (!sb_rdonly(sb)) { |
783f6184 | 1098 | down_write(&nilfs->ns_sem); |
f7545144 | 1099 | nilfs_setup_super(sb, true); |
783f6184 RK |
1100 | up_write(&nilfs->ns_sem); |
1101 | } | |
1102 | ||
783f6184 RK |
1103 | return 0; |
1104 | ||
783f6184 | 1105 | failed_segctor: |
f7545144 | 1106 | nilfs_detach_log_writer(sb); |
783f6184 RK |
1107 | |
1108 | failed_checkpoint: | |
4d8d9293 | 1109 | nilfs_put_root(fsroot); |
783f6184 | 1110 | |
f1e89c86 RK |
1111 | failed_unload: |
1112 | iput(nilfs->ns_sufile); | |
1113 | iput(nilfs->ns_cpfile); | |
1114 | iput(nilfs->ns_dat); | |
1115 | ||
348fe8da RK |
1116 | failed_nilfs: |
1117 | destroy_nilfs(nilfs); | |
783f6184 RK |
1118 | return err; |
1119 | } | |
1120 | ||
1121 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
1122 | { | |
e3154e97 | 1123 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 1124 | unsigned long old_sb_flags; |
06df0f99 | 1125 | unsigned long old_mount_opt; |
f11459ad | 1126 | int err; |
783f6184 | 1127 | |
02b9984d | 1128 | sync_filesystem(sb); |
783f6184 | 1129 | old_sb_flags = sb->s_flags; |
3b2ce58b | 1130 | old_mount_opt = nilfs->ns_mount_opt; |
783f6184 | 1131 | |
7c017457 | 1132 | if (!parse_options(data, sb, 1)) { |
783f6184 RK |
1133 | err = -EINVAL; |
1134 | goto restore_opts; | |
1135 | } | |
1751e8a6 | 1136 | sb->s_flags = (sb->s_flags & ~SB_POSIXACL); |
783f6184 | 1137 | |
d240e067 | 1138 | err = -EINVAL; |
783f6184 | 1139 | |
0234576d | 1140 | if (!nilfs_valid_fs(nilfs)) { |
feee880f RK |
1141 | nilfs_msg(sb, KERN_WARNING, |
1142 | "couldn't remount because the filesystem is in an incomplete recovery state"); | |
0234576d RK |
1143 | goto restore_opts; |
1144 | } | |
1145 | ||
1751e8a6 | 1146 | if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
783f6184 | 1147 | goto out; |
1751e8a6 | 1148 | if (*flags & SB_RDONLY) { |
f7545144 RK |
1149 | /* Shutting down log writer */ |
1150 | nilfs_detach_log_writer(sb); | |
1751e8a6 | 1151 | sb->s_flags |= SB_RDONLY; |
783f6184 | 1152 | |
783f6184 RK |
1153 | /* |
1154 | * Remounting a valid RW partition RDONLY, so set | |
1155 | * the RDONLY flag and then mark the partition as valid again. | |
1156 | */ | |
1157 | down_write(&nilfs->ns_sem); | |
f7545144 | 1158 | nilfs_cleanup_super(sb); |
783f6184 RK |
1159 | up_write(&nilfs->ns_sem); |
1160 | } else { | |
c5ca48aa | 1161 | __u64 features; |
e912a5b6 | 1162 | struct nilfs_root *root; |
c5ca48aa | 1163 | |
783f6184 RK |
1164 | /* |
1165 | * Mounting a RDONLY partition read-write, so reread and | |
1166 | * store the current valid flag. (It may have been changed | |
1167 | * by fsck since we originally mounted the partition.) | |
1168 | */ | |
c5ca48aa RK |
1169 | down_read(&nilfs->ns_sem); |
1170 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & | |
1171 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
1172 | up_read(&nilfs->ns_sem); | |
1173 | if (features) { | |
feee880f RK |
1174 | nilfs_msg(sb, KERN_WARNING, |
1175 | "couldn't remount RDWR because of unsupported optional features (%llx)", | |
1176 | (unsigned long long)features); | |
c5ca48aa RK |
1177 | err = -EROFS; |
1178 | goto restore_opts; | |
1179 | } | |
1180 | ||
1751e8a6 | 1181 | sb->s_flags &= ~SB_RDONLY; |
783f6184 | 1182 | |
2b0143b5 | 1183 | root = NILFS_I(d_inode(sb->s_root))->i_root; |
f7545144 | 1184 | err = nilfs_attach_log_writer(sb, root); |
783f6184 | 1185 | if (err) |
e59399d0 | 1186 | goto restore_opts; |
783f6184 RK |
1187 | |
1188 | down_write(&nilfs->ns_sem); | |
f7545144 | 1189 | nilfs_setup_super(sb, true); |
783f6184 | 1190 | up_write(&nilfs->ns_sem); |
783f6184 RK |
1191 | } |
1192 | out: | |
1193 | return 0; | |
1194 | ||
783f6184 RK |
1195 | restore_opts: |
1196 | sb->s_flags = old_sb_flags; | |
3b2ce58b | 1197 | nilfs->ns_mount_opt = old_mount_opt; |
783f6184 RK |
1198 | return err; |
1199 | } | |
1200 | ||
1201 | struct nilfs_super_data { | |
1202 | struct block_device *bdev; | |
1203 | __u64 cno; | |
1204 | int flags; | |
1205 | }; | |
1206 | ||
a7d3f104 RK |
1207 | static int nilfs_parse_snapshot_option(const char *option, |
1208 | const substring_t *arg, | |
1209 | struct nilfs_super_data *sd) | |
1210 | { | |
1211 | unsigned long long val; | |
1212 | const char *msg = NULL; | |
1213 | int err; | |
1214 | ||
1751e8a6 | 1215 | if (!(sd->flags & SB_RDONLY)) { |
a7d3f104 RK |
1216 | msg = "read-only option is not specified"; |
1217 | goto parse_error; | |
1218 | } | |
1219 | ||
1220 | err = kstrtoull(arg->from, 0, &val); | |
1221 | if (err) { | |
1222 | if (err == -ERANGE) | |
1223 | msg = "too large checkpoint number"; | |
1224 | else | |
1225 | msg = "malformed argument"; | |
1226 | goto parse_error; | |
1227 | } else if (val == 0) { | |
1228 | msg = "invalid checkpoint number 0"; | |
1229 | goto parse_error; | |
1230 | } | |
1231 | sd->cno = val; | |
1232 | return 0; | |
1233 | ||
1234 | parse_error: | |
1235 | nilfs_msg(NULL, KERN_ERR, "invalid option \"%s\": %s", option, msg); | |
1236 | return 1; | |
1237 | } | |
1238 | ||
783f6184 RK |
1239 | /** |
1240 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
1241 | * @data: mount options | |
1242 | * @sd: nilfs_super_data | |
1243 | */ | |
1244 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
1245 | { | |
1246 | char *p, *options = data; | |
1247 | substring_t args[MAX_OPT_ARGS]; | |
c05dbfc2 | 1248 | int token; |
783f6184 RK |
1249 | int ret = 0; |
1250 | ||
1251 | do { | |
1252 | p = strsep(&options, ","); | |
1253 | if (p != NULL && *p) { | |
1254 | token = match_token(p, tokens, args); | |
a7d3f104 RK |
1255 | if (token == Opt_snapshot) |
1256 | ret = nilfs_parse_snapshot_option(p, &args[0], | |
1257 | sd); | |
783f6184 RK |
1258 | } |
1259 | if (!options) | |
1260 | break; | |
1261 | BUG_ON(options == data); | |
1262 | *(options - 1) = ','; | |
1263 | } while (!ret); | |
1264 | return ret; | |
1265 | } | |
1266 | ||
1267 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1268 | { | |
f11459ad | 1269 | s->s_bdev = data; |
783f6184 RK |
1270 | s->s_dev = s->s_bdev->bd_dev; |
1271 | return 0; | |
1272 | } | |
1273 | ||
1274 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 | 1275 | { |
f11459ad | 1276 | return (void *)s->s_bdev == data; |
783f6184 RK |
1277 | } |
1278 | ||
e4c59d61 AV |
1279 | static struct dentry * |
1280 | nilfs_mount(struct file_system_type *fs_type, int flags, | |
1281 | const char *dev_name, void *data) | |
783f6184 RK |
1282 | { |
1283 | struct nilfs_super_data sd; | |
33c8e57c | 1284 | struct super_block *s; |
d4d77629 | 1285 | fmode_t mode = FMODE_READ | FMODE_EXCL; |
f11459ad RK |
1286 | struct dentry *root_dentry; |
1287 | int err, s_new = false; | |
783f6184 | 1288 | |
1751e8a6 | 1289 | if (!(flags & SB_RDONLY)) |
13e90559 RK |
1290 | mode |= FMODE_WRITE; |
1291 | ||
d4d77629 | 1292 | sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type); |
d6d4c19c | 1293 | if (IS_ERR(sd.bdev)) |
e4c59d61 | 1294 | return ERR_CAST(sd.bdev); |
783f6184 | 1295 | |
783f6184 RK |
1296 | sd.cno = 0; |
1297 | sd.flags = flags; | |
1298 | if (nilfs_identify((char *)data, &sd)) { | |
1299 | err = -EINVAL; | |
1300 | goto failed; | |
1301 | } | |
1302 | ||
6dd47406 | 1303 | /* |
5beb6e0b RK |
1304 | * once the super is inserted into the list by sget, s_umount |
1305 | * will protect the lockfs code from trying to start a snapshot | |
1306 | * while we are mounting | |
6dd47406 | 1307 | */ |
5beb6e0b RK |
1308 | mutex_lock(&sd.bdev->bd_fsfreeze_mutex); |
1309 | if (sd.bdev->bd_fsfreeze_count > 0) { | |
1310 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); | |
1311 | err = -EBUSY; | |
1312 | goto failed; | |
1313 | } | |
9249e17f DH |
1314 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, flags, |
1315 | sd.bdev); | |
5beb6e0b | 1316 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); |
33c8e57c RK |
1317 | if (IS_ERR(s)) { |
1318 | err = PTR_ERR(s); | |
348fe8da | 1319 | goto failed; |
783f6184 RK |
1320 | } |
1321 | ||
1322 | if (!s->s_root) { | |
8fa7c320 | 1323 | s_new = true; |
f11459ad | 1324 | |
33c8e57c | 1325 | /* New superblock instance created */ |
4571b82c | 1326 | s->s_mode = mode; |
a1c6f057 | 1327 | snprintf(s->s_id, sizeof(s->s_id), "%pg", sd.bdev); |
783f6184 RK |
1328 | sb_set_blocksize(s, block_size(sd.bdev)); |
1329 | ||
1751e8a6 | 1330 | err = nilfs_fill_super(s, data, flags & SB_SILENT ? 1 : 0); |
783f6184 | 1331 | if (err) |
348fe8da | 1332 | goto failed_super; |
783f6184 | 1333 | |
1751e8a6 | 1334 | s->s_flags |= SB_ACTIVE; |
f11459ad | 1335 | } else if (!sd.cno) { |
e95c311e | 1336 | if (nilfs_tree_is_busy(s->s_root)) { |
1751e8a6 | 1337 | if ((flags ^ s->s_flags) & SB_RDONLY) { |
feee880f RK |
1338 | nilfs_msg(s, KERN_ERR, |
1339 | "the device already has a %s mount.", | |
bc98a42c | 1340 | sb_rdonly(s) ? "read-only" : "read/write"); |
f11459ad RK |
1341 | err = -EBUSY; |
1342 | goto failed_super; | |
1343 | } | |
e95c311e | 1344 | } else { |
f11459ad RK |
1345 | /* |
1346 | * Try remount to setup mount states if the current | |
1347 | * tree is not mounted and only snapshots use this sb. | |
1348 | */ | |
1349 | err = nilfs_remount(s, &flags, data); | |
1350 | if (err) | |
1351 | goto failed_super; | |
1352 | } | |
783f6184 RK |
1353 | } |
1354 | ||
f11459ad RK |
1355 | if (sd.cno) { |
1356 | err = nilfs_attach_snapshot(s, sd.cno, &root_dentry); | |
348fe8da | 1357 | if (err) |
f11459ad | 1358 | goto failed_super; |
f11459ad RK |
1359 | } else { |
1360 | root_dentry = dget(s->s_root); | |
783f6184 RK |
1361 | } |
1362 | ||
f11459ad | 1363 | if (!s_new) |
d4d77629 | 1364 | blkdev_put(sd.bdev, mode); |
783f6184 | 1365 | |
e4c59d61 | 1366 | return root_dentry; |
783f6184 | 1367 | |
f11459ad | 1368 | failed_super: |
a95161aa | 1369 | deactivate_locked_super(s); |
783f6184 | 1370 | |
348fe8da RK |
1371 | failed: |
1372 | if (!s_new) | |
d4d77629 | 1373 | blkdev_put(sd.bdev, mode); |
e4c59d61 | 1374 | return ERR_PTR(err); |
783f6184 RK |
1375 | } |
1376 | ||
783f6184 RK |
1377 | struct file_system_type nilfs_fs_type = { |
1378 | .owner = THIS_MODULE, | |
1379 | .name = "nilfs2", | |
e4c59d61 | 1380 | .mount = nilfs_mount, |
783f6184 RK |
1381 | .kill_sb = kill_block_super, |
1382 | .fs_flags = FS_REQUIRES_DEV, | |
1383 | }; | |
7f78e035 | 1384 | MODULE_ALIAS_FS("nilfs2"); |
783f6184 | 1385 | |
41c88bd7 | 1386 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1387 | { |
41c88bd7 | 1388 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1389 | |
41c88bd7 LH |
1390 | INIT_LIST_HEAD(&ii->i_dirty); |
1391 | #ifdef CONFIG_NILFS_XATTR | |
1392 | init_rwsem(&ii->xattr_sem); | |
1393 | #endif | |
2aa15890 | 1394 | address_space_init_once(&ii->i_btnode_cache); |
05d0e94b | 1395 | ii->i_bmap = &ii->i_bmap_data; |
41c88bd7 LH |
1396 | inode_init_once(&ii->vfs_inode); |
1397 | } | |
783f6184 | 1398 | |
41c88bd7 LH |
1399 | static void nilfs_segbuf_init_once(void *obj) |
1400 | { | |
1401 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1402 | } | |
783f6184 | 1403 | |
41c88bd7 LH |
1404 | static void nilfs_destroy_cachep(void) |
1405 | { | |
8c0a8537 KS |
1406 | /* |
1407 | * Make sure all delayed rcu free inodes are flushed before we | |
1408 | * destroy cache. | |
1409 | */ | |
1410 | rcu_barrier(); | |
1411 | ||
da80a39f JL |
1412 | kmem_cache_destroy(nilfs_inode_cachep); |
1413 | kmem_cache_destroy(nilfs_transaction_cachep); | |
1414 | kmem_cache_destroy(nilfs_segbuf_cachep); | |
1415 | kmem_cache_destroy(nilfs_btree_path_cache); | |
41c88bd7 | 1416 | } |
783f6184 | 1417 | |
41c88bd7 LH |
1418 | static int __init nilfs_init_cachep(void) |
1419 | { | |
1420 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1421 | sizeof(struct nilfs_inode_info), 0, | |
5d097056 VD |
1422 | SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, |
1423 | nilfs_inode_init_once); | |
41c88bd7 LH |
1424 | if (!nilfs_inode_cachep) |
1425 | goto fail; | |
1426 | ||
1427 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1428 | sizeof(struct nilfs_transaction_info), 0, | |
1429 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1430 | if (!nilfs_transaction_cachep) | |
1431 | goto fail; | |
1432 | ||
1433 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1434 | sizeof(struct nilfs_segment_buffer), 0, | |
1435 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1436 | if (!nilfs_segbuf_cachep) | |
1437 | goto fail; | |
1438 | ||
1439 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1440 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1441 | 0, 0, NULL); | |
1442 | if (!nilfs_btree_path_cache) | |
1443 | goto fail; | |
783f6184 RK |
1444 | |
1445 | return 0; | |
1446 | ||
41c88bd7 LH |
1447 | fail: |
1448 | nilfs_destroy_cachep(); | |
1449 | return -ENOMEM; | |
1450 | } | |
1451 | ||
1452 | static int __init init_nilfs_fs(void) | |
1453 | { | |
1454 | int err; | |
783f6184 | 1455 | |
41c88bd7 LH |
1456 | err = nilfs_init_cachep(); |
1457 | if (err) | |
1458 | goto fail; | |
783f6184 | 1459 | |
dd70edbd | 1460 | err = nilfs_sysfs_init(); |
41c88bd7 LH |
1461 | if (err) |
1462 | goto free_cachep; | |
783f6184 | 1463 | |
dd70edbd VD |
1464 | err = register_filesystem(&nilfs_fs_type); |
1465 | if (err) | |
1466 | goto deinit_sysfs_entry; | |
1467 | ||
9f130263 | 1468 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1469 | return 0; |
783f6184 | 1470 | |
dd70edbd VD |
1471 | deinit_sysfs_entry: |
1472 | nilfs_sysfs_exit(); | |
41c88bd7 LH |
1473 | free_cachep: |
1474 | nilfs_destroy_cachep(); | |
1475 | fail: | |
783f6184 RK |
1476 | return err; |
1477 | } | |
1478 | ||
1479 | static void __exit exit_nilfs_fs(void) | |
1480 | { | |
41c88bd7 | 1481 | nilfs_destroy_cachep(); |
dd70edbd | 1482 | nilfs_sysfs_exit(); |
783f6184 RK |
1483 | unregister_filesystem(&nilfs_fs_type); |
1484 | } | |
1485 | ||
1486 | module_init(init_nilfs_fs) | |
1487 | module_exit(exit_nilfs_fs) |