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