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Commit | Line | Data |
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783f6184 RK |
1 | /* |
2 | * super.c - NILFS module and super block management. | |
3 | * | |
4 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
783f6184 RK |
16 | * Written by Ryusuke Konishi <ryusuke@osrg.net> |
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 RK |
172 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
173 | ||
174 | if (mdi) { | |
175 | kfree(mdi->mi_bgl); /* kfree(NULL) is safe */ | |
176 | kfree(mdi); | |
177 | } | |
783f6184 RK |
178 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
179 | } | |
180 | ||
fa0d7e3d NP |
181 | void nilfs_destroy_inode(struct inode *inode) |
182 | { | |
183 | call_rcu(&inode->i_rcu, nilfs_i_callback); | |
184 | } | |
185 | ||
f7545144 | 186 | static int nilfs_sync_super(struct super_block *sb, int flag) |
783f6184 | 187 | { |
e3154e97 | 188 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 189 | int err; |
783f6184 | 190 | |
783f6184 | 191 | retry: |
e339ad31 | 192 | set_buffer_dirty(nilfs->ns_sbh[0]); |
3b2ce58b | 193 | if (nilfs_test_opt(nilfs, BARRIER)) { |
87e99511 | 194 | err = __sync_dirty_buffer(nilfs->ns_sbh[0], |
f8c131f5 | 195 | WRITE_SYNC | WRITE_FLUSH_FUA); |
87e99511 CH |
196 | } else { |
197 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); | |
783f6184 | 198 | } |
87e99511 | 199 | |
e339ad31 | 200 | if (unlikely(err)) { |
783f6184 RK |
201 | printk(KERN_ERR |
202 | "NILFS: unable to write superblock (err=%d)\n", err); | |
e339ad31 | 203 | if (err == -EIO && nilfs->ns_sbh[1]) { |
b2ac86e1 JS |
204 | /* |
205 | * sbp[0] points to newer log than sbp[1], | |
206 | * so copy sbp[0] to sbp[1] to take over sbp[0]. | |
207 | */ | |
208 | memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0], | |
209 | nilfs->ns_sbsize); | |
e339ad31 RK |
210 | nilfs_fall_back_super_block(nilfs); |
211 | goto retry; | |
212 | } | |
213 | } else { | |
214 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; | |
215 | ||
b2ac86e1 JS |
216 | nilfs->ns_sbwcount++; |
217 | ||
e339ad31 RK |
218 | /* |
219 | * The latest segment becomes trailable from the position | |
220 | * written in superblock. | |
221 | */ | |
783f6184 | 222 | clear_nilfs_discontinued(nilfs); |
e339ad31 RK |
223 | |
224 | /* update GC protection for recent segments */ | |
225 | if (nilfs->ns_sbh[1]) { | |
b2ac86e1 | 226 | if (flag == NILFS_SB_COMMIT_ALL) { |
e339ad31 | 227 | set_buffer_dirty(nilfs->ns_sbh[1]); |
b2ac86e1 JS |
228 | if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0) |
229 | goto out; | |
e339ad31 | 230 | } |
b2ac86e1 JS |
231 | if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) < |
232 | le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno)) | |
233 | sbp = nilfs->ns_sbp[1]; | |
e339ad31 | 234 | } |
783f6184 | 235 | |
b2ac86e1 JS |
236 | spin_lock(&nilfs->ns_last_segment_lock); |
237 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); | |
238 | spin_unlock(&nilfs->ns_last_segment_lock); | |
239 | } | |
240 | out: | |
783f6184 RK |
241 | return err; |
242 | } | |
243 | ||
60f46b7e RK |
244 | void nilfs_set_log_cursor(struct nilfs_super_block *sbp, |
245 | struct the_nilfs *nilfs) | |
246 | { | |
247 | sector_t nfreeblocks; | |
248 | ||
249 | /* nilfs->ns_sem must be locked by the caller. */ | |
250 | nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
251 | sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
252 | ||
253 | spin_lock(&nilfs->ns_last_segment_lock); | |
254 | sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
255 | sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
256 | sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
257 | spin_unlock(&nilfs->ns_last_segment_lock); | |
258 | } | |
259 | ||
f7545144 | 260 | struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb, |
b2ac86e1 | 261 | int flip) |
783f6184 | 262 | { |
e3154e97 | 263 | struct the_nilfs *nilfs = sb->s_fs_info; |
e339ad31 | 264 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 265 | |
d26493b6 | 266 | /* nilfs->ns_sem must be locked by the caller. */ |
34cb9b5c | 267 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
d26493b6 JS |
268 | if (sbp[1] && |
269 | sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
b2ac86e1 | 270 | memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); |
d26493b6 | 271 | } else { |
e339ad31 | 272 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", |
f7545144 | 273 | sb->s_id); |
d26493b6 | 274 | return NULL; |
e339ad31 | 275 | } |
b2ac86e1 JS |
276 | } else if (sbp[1] && |
277 | sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
278 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
e339ad31 | 279 | } |
b2ac86e1 JS |
280 | |
281 | if (flip && sbp[1]) | |
282 | nilfs_swap_super_block(nilfs); | |
283 | ||
d26493b6 JS |
284 | return sbp; |
285 | } | |
286 | ||
f7545144 | 287 | int nilfs_commit_super(struct super_block *sb, int flag) |
d26493b6 | 288 | { |
e3154e97 | 289 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 JS |
290 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
291 | time_t t; | |
292 | ||
293 | /* nilfs->ns_sem must be locked by the caller. */ | |
e339ad31 | 294 | t = get_seconds(); |
b2ac86e1 | 295 | nilfs->ns_sbwtime = t; |
e339ad31 RK |
296 | sbp[0]->s_wtime = cpu_to_le64(t); |
297 | sbp[0]->s_sum = 0; | |
298 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
299 | (unsigned char *)sbp[0], | |
300 | nilfs->ns_sbsize)); | |
b2ac86e1 JS |
301 | if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) { |
302 | sbp[1]->s_wtime = sbp[0]->s_wtime; | |
303 | sbp[1]->s_sum = 0; | |
304 | sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
305 | (unsigned char *)sbp[1], | |
306 | nilfs->ns_sbsize)); | |
e339ad31 | 307 | } |
e605f0a7 | 308 | clear_nilfs_sb_dirty(nilfs); |
e2c7617a AR |
309 | nilfs->ns_flushed_device = 1; |
310 | /* make sure store to ns_flushed_device cannot be reordered */ | |
311 | smp_wmb(); | |
f7545144 | 312 | return nilfs_sync_super(sb, flag); |
783f6184 RK |
313 | } |
314 | ||
7ecaa46c RK |
315 | /** |
316 | * nilfs_cleanup_super() - write filesystem state for cleanup | |
f7545144 | 317 | * @sb: super block instance to be unmounted or degraded to read-only |
7ecaa46c RK |
318 | * |
319 | * This function restores state flags in the on-disk super block. | |
320 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the | |
321 | * filesystem was not clean previously. | |
322 | */ | |
f7545144 | 323 | int nilfs_cleanup_super(struct super_block *sb) |
7ecaa46c | 324 | { |
e3154e97 | 325 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 326 | struct nilfs_super_block **sbp; |
b2ac86e1 | 327 | int flag = NILFS_SB_COMMIT; |
d26493b6 | 328 | int ret = -EIO; |
7ecaa46c | 329 | |
f7545144 | 330 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 | 331 | if (sbp) { |
f7545144 RK |
332 | sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state); |
333 | nilfs_set_log_cursor(sbp[0], nilfs); | |
b2ac86e1 JS |
334 | if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { |
335 | /* | |
336 | * make the "clean" flag also to the opposite | |
337 | * super block if both super blocks point to | |
338 | * the same checkpoint. | |
339 | */ | |
340 | sbp[1]->s_state = sbp[0]->s_state; | |
341 | flag = NILFS_SB_COMMIT_ALL; | |
342 | } | |
f7545144 | 343 | ret = nilfs_commit_super(sb, flag); |
d26493b6 | 344 | } |
7ecaa46c RK |
345 | return ret; |
346 | } | |
347 | ||
cfb0a4bf RK |
348 | /** |
349 | * nilfs_move_2nd_super - relocate secondary super block | |
350 | * @sb: super block instance | |
351 | * @sb2off: new offset of the secondary super block (in bytes) | |
352 | */ | |
353 | static int nilfs_move_2nd_super(struct super_block *sb, loff_t sb2off) | |
354 | { | |
355 | struct the_nilfs *nilfs = sb->s_fs_info; | |
356 | struct buffer_head *nsbh; | |
357 | struct nilfs_super_block *nsbp; | |
358 | sector_t blocknr, newblocknr; | |
359 | unsigned long offset; | |
4f05028f | 360 | int sb2i; /* array index of the secondary superblock */ |
cfb0a4bf RK |
361 | int ret = 0; |
362 | ||
363 | /* nilfs->ns_sem must be locked by the caller. */ | |
364 | if (nilfs->ns_sbh[1] && | |
365 | nilfs->ns_sbh[1]->b_blocknr > nilfs->ns_first_data_block) { | |
366 | sb2i = 1; | |
367 | blocknr = nilfs->ns_sbh[1]->b_blocknr; | |
368 | } else if (nilfs->ns_sbh[0]->b_blocknr > nilfs->ns_first_data_block) { | |
369 | sb2i = 0; | |
370 | blocknr = nilfs->ns_sbh[0]->b_blocknr; | |
4f05028f RK |
371 | } else { |
372 | sb2i = -1; | |
373 | blocknr = 0; | |
cfb0a4bf RK |
374 | } |
375 | if (sb2i >= 0 && (u64)blocknr << nilfs->ns_blocksize_bits == sb2off) | |
376 | goto out; /* super block location is unchanged */ | |
377 | ||
378 | /* Get new super block buffer */ | |
379 | newblocknr = sb2off >> nilfs->ns_blocksize_bits; | |
380 | offset = sb2off & (nilfs->ns_blocksize - 1); | |
381 | nsbh = sb_getblk(sb, newblocknr); | |
382 | if (!nsbh) { | |
383 | printk(KERN_WARNING | |
384 | "NILFS warning: unable to move secondary superblock " | |
385 | "to block %llu\n", (unsigned long long)newblocknr); | |
386 | ret = -EIO; | |
387 | goto out; | |
388 | } | |
389 | nsbp = (void *)nsbh->b_data + offset; | |
390 | memset(nsbp, 0, nilfs->ns_blocksize); | |
391 | ||
392 | if (sb2i >= 0) { | |
393 | memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize); | |
394 | brelse(nilfs->ns_sbh[sb2i]); | |
395 | nilfs->ns_sbh[sb2i] = nsbh; | |
396 | nilfs->ns_sbp[sb2i] = nsbp; | |
397 | } else if (nilfs->ns_sbh[0]->b_blocknr < nilfs->ns_first_data_block) { | |
398 | /* secondary super block will be restored to index 1 */ | |
399 | nilfs->ns_sbh[1] = nsbh; | |
400 | nilfs->ns_sbp[1] = nsbp; | |
401 | } else { | |
402 | brelse(nsbh); | |
403 | } | |
404 | out: | |
405 | return ret; | |
406 | } | |
407 | ||
4e33f9ea RK |
408 | /** |
409 | * nilfs_resize_fs - resize the filesystem | |
410 | * @sb: super block instance | |
411 | * @newsize: new size of the filesystem (in bytes) | |
412 | */ | |
413 | int nilfs_resize_fs(struct super_block *sb, __u64 newsize) | |
414 | { | |
415 | struct the_nilfs *nilfs = sb->s_fs_info; | |
416 | struct nilfs_super_block **sbp; | |
417 | __u64 devsize, newnsegs; | |
418 | loff_t sb2off; | |
419 | int ret; | |
420 | ||
421 | ret = -ERANGE; | |
422 | devsize = i_size_read(sb->s_bdev->bd_inode); | |
423 | if (newsize > devsize) | |
424 | goto out; | |
425 | ||
426 | /* | |
427 | * Write lock is required to protect some functions depending | |
428 | * on the number of segments, the number of reserved segments, | |
429 | * and so forth. | |
430 | */ | |
431 | down_write(&nilfs->ns_segctor_sem); | |
432 | ||
433 | sb2off = NILFS_SB2_OFFSET_BYTES(newsize); | |
434 | newnsegs = sb2off >> nilfs->ns_blocksize_bits; | |
435 | do_div(newnsegs, nilfs->ns_blocks_per_segment); | |
436 | ||
437 | ret = nilfs_sufile_resize(nilfs->ns_sufile, newnsegs); | |
438 | up_write(&nilfs->ns_segctor_sem); | |
439 | if (ret < 0) | |
440 | goto out; | |
441 | ||
442 | ret = nilfs_construct_segment(sb); | |
443 | if (ret < 0) | |
444 | goto out; | |
445 | ||
446 | down_write(&nilfs->ns_sem); | |
447 | nilfs_move_2nd_super(sb, sb2off); | |
448 | ret = -EIO; | |
449 | sbp = nilfs_prepare_super(sb, 0); | |
450 | if (likely(sbp)) { | |
451 | nilfs_set_log_cursor(sbp[0], nilfs); | |
452 | /* | |
453 | * Drop NILFS_RESIZE_FS flag for compatibility with | |
454 | * mount-time resize which may be implemented in a | |
455 | * future release. | |
456 | */ | |
457 | sbp[0]->s_state = cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & | |
458 | ~NILFS_RESIZE_FS); | |
459 | sbp[0]->s_dev_size = cpu_to_le64(newsize); | |
460 | sbp[0]->s_nsegments = cpu_to_le64(nilfs->ns_nsegments); | |
461 | if (sbp[1]) | |
462 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
463 | ret = nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); | |
464 | } | |
465 | up_write(&nilfs->ns_sem); | |
466 | ||
467 | /* | |
468 | * Reset the range of allocatable segments last. This order | |
469 | * is important in the case of expansion because the secondary | |
470 | * superblock must be protected from log write until migration | |
471 | * completes. | |
472 | */ | |
473 | if (!ret) | |
474 | nilfs_sufile_set_alloc_range(nilfs->ns_sufile, 0, newnsegs - 1); | |
475 | out: | |
476 | return ret; | |
477 | } | |
478 | ||
783f6184 RK |
479 | static void nilfs_put_super(struct super_block *sb) |
480 | { | |
e3154e97 | 481 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 482 | |
f7545144 | 483 | nilfs_detach_log_writer(sb); |
783f6184 RK |
484 | |
485 | if (!(sb->s_flags & MS_RDONLY)) { | |
486 | down_write(&nilfs->ns_sem); | |
f7545144 | 487 | nilfs_cleanup_super(sb); |
783f6184 RK |
488 | up_write(&nilfs->ns_sem); |
489 | } | |
490 | ||
f1e89c86 RK |
491 | iput(nilfs->ns_sufile); |
492 | iput(nilfs->ns_cpfile); | |
493 | iput(nilfs->ns_dat); | |
494 | ||
348fe8da | 495 | destroy_nilfs(nilfs); |
783f6184 | 496 | sb->s_fs_info = NULL; |
783f6184 RK |
497 | } |
498 | ||
783f6184 RK |
499 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
500 | { | |
e3154e97 | 501 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 502 | struct nilfs_super_block **sbp; |
783f6184 RK |
503 | int err = 0; |
504 | ||
505 | /* This function is called when super block should be written back */ | |
506 | if (wait) | |
507 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
508 | |
509 | down_write(&nilfs->ns_sem); | |
d26493b6 | 510 | if (nilfs_sb_dirty(nilfs)) { |
f7545144 | 511 | sbp = nilfs_prepare_super(sb, nilfs_sb_will_flip(nilfs)); |
b2ac86e1 JS |
512 | if (likely(sbp)) { |
513 | nilfs_set_log_cursor(sbp[0], nilfs); | |
f7545144 | 514 | nilfs_commit_super(sb, NILFS_SB_COMMIT); |
b2ac86e1 | 515 | } |
d26493b6 | 516 | } |
6233caa9 JS |
517 | up_write(&nilfs->ns_sem); |
518 | ||
e2c7617a AR |
519 | if (!err) |
520 | err = nilfs_flush_device(nilfs); | |
521 | ||
783f6184 RK |
522 | return err; |
523 | } | |
524 | ||
f7545144 | 525 | int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt, |
4d8d9293 | 526 | struct nilfs_root **rootp) |
783f6184 | 527 | { |
e3154e97 | 528 | struct the_nilfs *nilfs = sb->s_fs_info; |
4d8d9293 | 529 | struct nilfs_root *root; |
783f6184 RK |
530 | struct nilfs_checkpoint *raw_cp; |
531 | struct buffer_head *bh_cp; | |
4d8d9293 | 532 | int err = -ENOMEM; |
783f6184 | 533 | |
4d8d9293 RK |
534 | root = nilfs_find_or_create_root( |
535 | nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); | |
536 | if (!root) | |
537 | return err; | |
783f6184 | 538 | |
e912a5b6 RK |
539 | if (root->ifile) |
540 | goto reuse; /* already attached checkpoint */ | |
783f6184 | 541 | |
1154ecbd | 542 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
543 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
544 | &bh_cp); | |
1154ecbd | 545 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
546 | if (unlikely(err)) { |
547 | if (err == -ENOENT || err == -EINVAL) { | |
548 | printk(KERN_ERR | |
549 | "NILFS: Invalid checkpoint " | |
550 | "(checkpoint number=%llu)\n", | |
551 | (unsigned long long)cno); | |
552 | err = -EINVAL; | |
553 | } | |
554 | goto failed; | |
555 | } | |
f1e89c86 | 556 | |
f7545144 | 557 | err = nilfs_ifile_read(sb, root, nilfs->ns_inode_size, |
f1e89c86 RK |
558 | &raw_cp->cp_ifile_inode, &root->ifile); |
559 | if (err) | |
783f6184 | 560 | goto failed_bh; |
b7c06342 | 561 | |
e5f7f848 VD |
562 | atomic64_set(&root->inodes_count, |
563 | le64_to_cpu(raw_cp->cp_inodes_count)); | |
564 | atomic64_set(&root->blocks_count, | |
565 | le64_to_cpu(raw_cp->cp_blocks_count)); | |
783f6184 RK |
566 | |
567 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
4d8d9293 | 568 | |
e912a5b6 | 569 | reuse: |
4d8d9293 | 570 | *rootp = root; |
783f6184 RK |
571 | return 0; |
572 | ||
573 | failed_bh: | |
574 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
575 | failed: | |
4d8d9293 | 576 | nilfs_put_root(root); |
783f6184 RK |
577 | |
578 | return err; | |
579 | } | |
783f6184 | 580 | |
5beb6e0b RK |
581 | static int nilfs_freeze(struct super_block *sb) |
582 | { | |
e3154e97 | 583 | struct the_nilfs *nilfs = sb->s_fs_info; |
5beb6e0b RK |
584 | int err; |
585 | ||
586 | if (sb->s_flags & MS_RDONLY) | |
587 | return 0; | |
783f6184 | 588 | |
5beb6e0b RK |
589 | /* Mark super block clean */ |
590 | down_write(&nilfs->ns_sem); | |
f7545144 | 591 | err = nilfs_cleanup_super(sb); |
5beb6e0b | 592 | up_write(&nilfs->ns_sem); |
783f6184 RK |
593 | return err; |
594 | } | |
595 | ||
5beb6e0b | 596 | static int nilfs_unfreeze(struct super_block *sb) |
783f6184 | 597 | { |
e3154e97 | 598 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 599 | |
5beb6e0b RK |
600 | if (sb->s_flags & MS_RDONLY) |
601 | return 0; | |
602 | ||
603 | down_write(&nilfs->ns_sem); | |
f7545144 | 604 | nilfs_setup_super(sb, false); |
5beb6e0b RK |
605 | up_write(&nilfs->ns_sem); |
606 | return 0; | |
783f6184 RK |
607 | } |
608 | ||
783f6184 RK |
609 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
610 | { | |
611 | struct super_block *sb = dentry->d_sb; | |
2b0143b5 | 612 | struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root; |
b7c06342 | 613 | struct the_nilfs *nilfs = root->nilfs; |
c306af23 | 614 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
783f6184 RK |
615 | unsigned long long blocks; |
616 | unsigned long overhead; | |
617 | unsigned long nrsvblocks; | |
618 | sector_t nfreeblocks; | |
c7ef972c | 619 | u64 nmaxinodes, nfreeinodes; |
783f6184 RK |
620 | int err; |
621 | ||
622 | /* | |
623 | * Compute all of the segment blocks | |
624 | * | |
625 | * The blocks before first segment and after last segment | |
626 | * are excluded. | |
627 | */ | |
628 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
629 | - nilfs->ns_first_data_block; | |
630 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
631 | ||
632 | /* | |
633 | * Compute the overhead | |
634 | * | |
7a65004b | 635 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
636 | * We must count them as the overhead. |
637 | */ | |
638 | overhead = 0; | |
639 | ||
640 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
641 | if (unlikely(err)) | |
642 | return err; | |
643 | ||
c7ef972c VD |
644 | err = nilfs_ifile_count_free_inodes(root->ifile, |
645 | &nmaxinodes, &nfreeinodes); | |
646 | if (unlikely(err)) { | |
647 | printk(KERN_WARNING | |
648 | "NILFS warning: fail to count free inodes: err %d.\n", | |
649 | err); | |
650 | if (err == -ERANGE) { | |
651 | /* | |
652 | * If nilfs_palloc_count_max_entries() returns | |
653 | * -ERANGE error code then we simply treat | |
654 | * curent inodes count as maximum possible and | |
655 | * zero as free inodes value. | |
656 | */ | |
e5f7f848 | 657 | nmaxinodes = atomic64_read(&root->inodes_count); |
c7ef972c VD |
658 | nfreeinodes = 0; |
659 | err = 0; | |
660 | } else | |
661 | return err; | |
662 | } | |
663 | ||
783f6184 RK |
664 | buf->f_type = NILFS_SUPER_MAGIC; |
665 | buf->f_bsize = sb->s_blocksize; | |
666 | buf->f_blocks = blocks - overhead; | |
667 | buf->f_bfree = nfreeblocks; | |
668 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
669 | (buf->f_bfree - nrsvblocks) : 0; | |
c7ef972c VD |
670 | buf->f_files = nmaxinodes; |
671 | buf->f_ffree = nfreeinodes; | |
783f6184 | 672 | buf->f_namelen = NILFS_NAME_LEN; |
c306af23 RK |
673 | buf->f_fsid.val[0] = (u32)id; |
674 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
675 | ||
783f6184 RK |
676 | return 0; |
677 | } | |
678 | ||
34c80b1d | 679 | static int nilfs_show_options(struct seq_file *seq, struct dentry *dentry) |
b58a285b | 680 | { |
34c80b1d | 681 | struct super_block *sb = dentry->d_sb; |
e3154e97 | 682 | struct the_nilfs *nilfs = sb->s_fs_info; |
2b0143b5 | 683 | struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root; |
b58a285b | 684 | |
3b2ce58b | 685 | if (!nilfs_test_opt(nilfs, BARRIER)) |
c6b4d57d | 686 | seq_puts(seq, ",nobarrier"); |
f11459ad RK |
687 | if (root->cno != NILFS_CPTREE_CURRENT_CNO) |
688 | seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno); | |
3b2ce58b | 689 | if (nilfs_test_opt(nilfs, ERRORS_PANIC)) |
c6b4d57d | 690 | seq_puts(seq, ",errors=panic"); |
3b2ce58b | 691 | if (nilfs_test_opt(nilfs, ERRORS_CONT)) |
c6b4d57d | 692 | seq_puts(seq, ",errors=continue"); |
3b2ce58b | 693 | if (nilfs_test_opt(nilfs, STRICT_ORDER)) |
c6b4d57d | 694 | seq_puts(seq, ",order=strict"); |
3b2ce58b | 695 | if (nilfs_test_opt(nilfs, NORECOVERY)) |
c6b4d57d | 696 | seq_puts(seq, ",norecovery"); |
3b2ce58b | 697 | if (nilfs_test_opt(nilfs, DISCARD)) |
c6b4d57d | 698 | seq_puts(seq, ",discard"); |
b58a285b JS |
699 | |
700 | return 0; | |
701 | } | |
702 | ||
b87221de | 703 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
704 | .alloc_inode = nilfs_alloc_inode, |
705 | .destroy_inode = nilfs_destroy_inode, | |
706 | .dirty_inode = nilfs_dirty_inode, | |
6fd1e5c9 | 707 | .evict_inode = nilfs_evict_inode, |
783f6184 | 708 | .put_super = nilfs_put_super, |
783f6184 | 709 | .sync_fs = nilfs_sync_fs, |
5beb6e0b RK |
710 | .freeze_fs = nilfs_freeze, |
711 | .unfreeze_fs = nilfs_unfreeze, | |
783f6184 RK |
712 | .statfs = nilfs_statfs, |
713 | .remount_fs = nilfs_remount, | |
b58a285b | 714 | .show_options = nilfs_show_options |
783f6184 RK |
715 | }; |
716 | ||
783f6184 RK |
717 | enum { |
718 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
773bc4f3 | 719 | Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
802d3177 | 720 | Opt_discard, Opt_nodiscard, Opt_err, |
783f6184 RK |
721 | }; |
722 | ||
723 | static match_table_t tokens = { | |
724 | {Opt_err_cont, "errors=continue"}, | |
725 | {Opt_err_panic, "errors=panic"}, | |
726 | {Opt_err_ro, "errors=remount-ro"}, | |
773bc4f3 | 727 | {Opt_barrier, "barrier"}, |
91f1953b | 728 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
729 | {Opt_snapshot, "cp=%u"}, |
730 | {Opt_order, "order=%s"}, | |
0234576d | 731 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 732 | {Opt_discard, "discard"}, |
802d3177 | 733 | {Opt_nodiscard, "nodiscard"}, |
783f6184 RK |
734 | {Opt_err, NULL} |
735 | }; | |
736 | ||
7c017457 | 737 | static int parse_options(char *options, struct super_block *sb, int is_remount) |
783f6184 | 738 | { |
e3154e97 | 739 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 RK |
740 | char *p; |
741 | substring_t args[MAX_OPT_ARGS]; | |
783f6184 RK |
742 | |
743 | if (!options) | |
744 | return 1; | |
745 | ||
746 | while ((p = strsep(&options, ",")) != NULL) { | |
747 | int token; | |
748 | if (!*p) | |
749 | continue; | |
750 | ||
751 | token = match_token(p, tokens, args); | |
752 | switch (token) { | |
773bc4f3 | 753 | case Opt_barrier: |
3b2ce58b | 754 | nilfs_set_opt(nilfs, BARRIER); |
773bc4f3 | 755 | break; |
91f1953b | 756 | case Opt_nobarrier: |
3b2ce58b | 757 | nilfs_clear_opt(nilfs, BARRIER); |
783f6184 RK |
758 | break; |
759 | case Opt_order: | |
760 | if (strcmp(args[0].from, "relaxed") == 0) | |
761 | /* Ordered data semantics */ | |
3b2ce58b | 762 | nilfs_clear_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
763 | else if (strcmp(args[0].from, "strict") == 0) |
764 | /* Strict in-order semantics */ | |
3b2ce58b | 765 | nilfs_set_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
766 | else |
767 | return 0; | |
768 | break; | |
769 | case Opt_err_panic: | |
3b2ce58b | 770 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC); |
783f6184 RK |
771 | break; |
772 | case Opt_err_ro: | |
3b2ce58b | 773 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO); |
783f6184 RK |
774 | break; |
775 | case Opt_err_cont: | |
3b2ce58b | 776 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT); |
783f6184 RK |
777 | break; |
778 | case Opt_snapshot: | |
7c017457 | 779 | if (is_remount) { |
f11459ad RK |
780 | printk(KERN_ERR |
781 | "NILFS: \"%s\" option is invalid " | |
782 | "for remount.\n", p); | |
783f6184 | 783 | return 0; |
7c017457 | 784 | } |
783f6184 | 785 | break; |
0234576d | 786 | case Opt_norecovery: |
3b2ce58b | 787 | nilfs_set_opt(nilfs, NORECOVERY); |
0234576d | 788 | break; |
e902ec99 | 789 | case Opt_discard: |
3b2ce58b | 790 | nilfs_set_opt(nilfs, DISCARD); |
e902ec99 | 791 | break; |
802d3177 | 792 | case Opt_nodiscard: |
3b2ce58b | 793 | nilfs_clear_opt(nilfs, DISCARD); |
802d3177 | 794 | break; |
783f6184 RK |
795 | default: |
796 | printk(KERN_ERR | |
797 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
798 | return 0; | |
799 | } | |
800 | } | |
801 | return 1; | |
802 | } | |
803 | ||
804 | static inline void | |
3b2ce58b | 805 | nilfs_set_default_options(struct super_block *sb, |
783f6184 RK |
806 | struct nilfs_super_block *sbp) |
807 | { | |
e3154e97 | 808 | struct the_nilfs *nilfs = sb->s_fs_info; |
3b2ce58b RK |
809 | |
810 | nilfs->ns_mount_opt = | |
277a6a34 | 811 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
812 | } |
813 | ||
f7545144 | 814 | static int nilfs_setup_super(struct super_block *sb, int is_mount) |
783f6184 | 815 | { |
e3154e97 | 816 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 JS |
817 | struct nilfs_super_block **sbp; |
818 | int max_mnt_count; | |
819 | int mnt_count; | |
820 | ||
821 | /* nilfs->ns_sem must be locked by the caller. */ | |
f7545144 | 822 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 JS |
823 | if (!sbp) |
824 | return -EIO; | |
825 | ||
5beb6e0b RK |
826 | if (!is_mount) |
827 | goto skip_mount_setup; | |
828 | ||
d26493b6 JS |
829 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); |
830 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); | |
783f6184 | 831 | |
f50a4c81 | 832 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
783f6184 RK |
833 | printk(KERN_WARNING |
834 | "NILFS warning: mounting fs with errors\n"); | |
835 | #if 0 | |
836 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
837 | printk(KERN_WARNING | |
838 | "NILFS warning: maximal mount count reached\n"); | |
839 | #endif | |
840 | } | |
841 | if (!max_mnt_count) | |
d26493b6 | 842 | sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
783f6184 | 843 | |
d26493b6 | 844 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
5beb6e0b RK |
845 | sbp[0]->s_mtime = cpu_to_le64(get_seconds()); |
846 | ||
847 | skip_mount_setup: | |
d26493b6 JS |
848 | sbp[0]->s_state = |
849 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); | |
b2ac86e1 | 850 | /* synchronize sbp[1] with sbp[0] */ |
0ca7a5b9 RK |
851 | if (sbp[1]) |
852 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
f7545144 | 853 | return nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); |
783f6184 RK |
854 | } |
855 | ||
e339ad31 RK |
856 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
857 | u64 pos, int blocksize, | |
858 | struct buffer_head **pbh) | |
783f6184 | 859 | { |
e339ad31 RK |
860 | unsigned long long sb_index = pos; |
861 | unsigned long offset; | |
783f6184 | 862 | |
e339ad31 | 863 | offset = do_div(sb_index, blocksize); |
783f6184 | 864 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 865 | if (!*pbh) |
783f6184 | 866 | return NULL; |
783f6184 RK |
867 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
868 | } | |
869 | ||
783f6184 RK |
870 | int nilfs_store_magic_and_option(struct super_block *sb, |
871 | struct nilfs_super_block *sbp, | |
872 | char *data) | |
873 | { | |
e3154e97 | 874 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 875 | |
783f6184 RK |
876 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
877 | ||
878 | /* FS independent flags */ | |
879 | #ifdef NILFS_ATIME_DISABLE | |
880 | sb->s_flags |= MS_NOATIME; | |
881 | #endif | |
882 | ||
3b2ce58b | 883 | nilfs_set_default_options(sb, sbp); |
783f6184 | 884 | |
574e6c31 RK |
885 | nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid); |
886 | nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid); | |
887 | nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval); | |
888 | nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max); | |
783f6184 | 889 | |
7c017457 | 890 | return !parse_options(data, sb, 0) ? -EINVAL : 0 ; |
783f6184 RK |
891 | } |
892 | ||
c5ca48aa RK |
893 | int nilfs_check_feature_compatibility(struct super_block *sb, |
894 | struct nilfs_super_block *sbp) | |
895 | { | |
896 | __u64 features; | |
897 | ||
898 | features = le64_to_cpu(sbp->s_feature_incompat) & | |
899 | ~NILFS_FEATURE_INCOMPAT_SUPP; | |
900 | if (features) { | |
901 | printk(KERN_ERR "NILFS: couldn't mount because of unsupported " | |
902 | "optional features (%llx)\n", | |
903 | (unsigned long long)features); | |
904 | return -EINVAL; | |
905 | } | |
906 | features = le64_to_cpu(sbp->s_feature_compat_ro) & | |
907 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
908 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
909 | printk(KERN_ERR "NILFS: couldn't mount RDWR because of " | |
910 | "unsupported optional features (%llx)\n", | |
911 | (unsigned long long)features); | |
912 | return -EINVAL; | |
913 | } | |
914 | return 0; | |
915 | } | |
916 | ||
367ea334 RK |
917 | static int nilfs_get_root_dentry(struct super_block *sb, |
918 | struct nilfs_root *root, | |
919 | struct dentry **root_dentry) | |
920 | { | |
921 | struct inode *inode; | |
922 | struct dentry *dentry; | |
923 | int ret = 0; | |
924 | ||
925 | inode = nilfs_iget(sb, root, NILFS_ROOT_INO); | |
926 | if (IS_ERR(inode)) { | |
927 | printk(KERN_ERR "NILFS: get root inode failed\n"); | |
928 | ret = PTR_ERR(inode); | |
929 | goto out; | |
930 | } | |
931 | if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { | |
932 | iput(inode); | |
933 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); | |
934 | ret = -EINVAL; | |
935 | goto out; | |
936 | } | |
937 | ||
f11459ad RK |
938 | if (root->cno == NILFS_CPTREE_CURRENT_CNO) { |
939 | dentry = d_find_alias(inode); | |
940 | if (!dentry) { | |
48fde701 | 941 | dentry = d_make_root(inode); |
f11459ad | 942 | if (!dentry) { |
f11459ad RK |
943 | ret = -ENOMEM; |
944 | goto failed_dentry; | |
945 | } | |
946 | } else { | |
947 | iput(inode); | |
948 | } | |
949 | } else { | |
1a0a397e | 950 | dentry = d_obtain_root(inode); |
f11459ad RK |
951 | if (IS_ERR(dentry)) { |
952 | ret = PTR_ERR(dentry); | |
953 | goto failed_dentry; | |
954 | } | |
367ea334 RK |
955 | } |
956 | *root_dentry = dentry; | |
957 | out: | |
958 | return ret; | |
f11459ad RK |
959 | |
960 | failed_dentry: | |
961 | printk(KERN_ERR "NILFS: get root dentry failed\n"); | |
962 | goto out; | |
367ea334 RK |
963 | } |
964 | ||
ab4d8f7e RK |
965 | static int nilfs_attach_snapshot(struct super_block *s, __u64 cno, |
966 | struct dentry **root_dentry) | |
967 | { | |
e3154e97 | 968 | struct the_nilfs *nilfs = s->s_fs_info; |
ab4d8f7e RK |
969 | struct nilfs_root *root; |
970 | int ret; | |
971 | ||
572d8b39 RK |
972 | mutex_lock(&nilfs->ns_snapshot_mount_mutex); |
973 | ||
ab4d8f7e RK |
974 | down_read(&nilfs->ns_segctor_sem); |
975 | ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno); | |
976 | up_read(&nilfs->ns_segctor_sem); | |
977 | if (ret < 0) { | |
978 | ret = (ret == -ENOENT) ? -EINVAL : ret; | |
979 | goto out; | |
980 | } else if (!ret) { | |
981 | printk(KERN_ERR "NILFS: The specified checkpoint is " | |
982 | "not a snapshot (checkpoint number=%llu).\n", | |
983 | (unsigned long long)cno); | |
984 | ret = -EINVAL; | |
985 | goto out; | |
986 | } | |
987 | ||
f7545144 | 988 | ret = nilfs_attach_checkpoint(s, cno, false, &root); |
ab4d8f7e RK |
989 | if (ret) { |
990 | printk(KERN_ERR "NILFS: error loading snapshot " | |
991 | "(checkpoint number=%llu).\n", | |
992 | (unsigned long long)cno); | |
993 | goto out; | |
994 | } | |
995 | ret = nilfs_get_root_dentry(s, root, root_dentry); | |
996 | nilfs_put_root(root); | |
997 | out: | |
572d8b39 | 998 | mutex_unlock(&nilfs->ns_snapshot_mount_mutex); |
ab4d8f7e RK |
999 | return ret; |
1000 | } | |
1001 | ||
f11459ad | 1002 | /** |
e95c311e | 1003 | * nilfs_tree_is_busy() - try to shrink dentries of a checkpoint |
f11459ad RK |
1004 | * @root_dentry: root dentry of the tree to be shrunk |
1005 | * | |
1006 | * This function returns true if the tree was in-use. | |
1007 | */ | |
e95c311e | 1008 | static bool nilfs_tree_is_busy(struct dentry *root_dentry) |
f11459ad | 1009 | { |
f11459ad | 1010 | shrink_dcache_parent(root_dentry); |
e95c311e | 1011 | return d_count(root_dentry) > 1; |
f11459ad RK |
1012 | } |
1013 | ||
032dbb3b RK |
1014 | int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno) |
1015 | { | |
e3154e97 | 1016 | struct the_nilfs *nilfs = sb->s_fs_info; |
032dbb3b RK |
1017 | struct nilfs_root *root; |
1018 | struct inode *inode; | |
1019 | struct dentry *dentry; | |
1020 | int ret; | |
1021 | ||
3377f843 | 1022 | if (cno > nilfs->ns_cno) |
032dbb3b RK |
1023 | return false; |
1024 | ||
1025 | if (cno >= nilfs_last_cno(nilfs)) | |
1026 | return true; /* protect recent checkpoints */ | |
1027 | ||
1028 | ret = false; | |
e3154e97 | 1029 | root = nilfs_lookup_root(nilfs, cno); |
032dbb3b RK |
1030 | if (root) { |
1031 | inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO); | |
1032 | if (inode) { | |
1033 | dentry = d_find_alias(inode); | |
1034 | if (dentry) { | |
e95c311e | 1035 | ret = nilfs_tree_is_busy(dentry); |
032dbb3b RK |
1036 | dput(dentry); |
1037 | } | |
1038 | iput(inode); | |
1039 | } | |
1040 | nilfs_put_root(root); | |
1041 | } | |
1042 | return ret; | |
1043 | } | |
1044 | ||
783f6184 RK |
1045 | /** |
1046 | * nilfs_fill_super() - initialize a super block instance | |
1047 | * @sb: super_block | |
1048 | * @data: mount options | |
1049 | * @silent: silent mode flag | |
783f6184 | 1050 | * |
aa7dfb89 | 1051 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
1052 | * So, the recovery process is protected from other simultaneous mounts. |
1053 | */ | |
1054 | static int | |
348fe8da | 1055 | nilfs_fill_super(struct super_block *sb, void *data, int silent) |
783f6184 | 1056 | { |
348fe8da | 1057 | struct the_nilfs *nilfs; |
4d8d9293 | 1058 | struct nilfs_root *fsroot; |
783f6184 RK |
1059 | __u64 cno; |
1060 | int err; | |
1061 | ||
e3154e97 RK |
1062 | nilfs = alloc_nilfs(sb->s_bdev); |
1063 | if (!nilfs) | |
783f6184 RK |
1064 | return -ENOMEM; |
1065 | ||
e3154e97 | 1066 | sb->s_fs_info = nilfs; |
783f6184 | 1067 | |
f7545144 | 1068 | err = init_nilfs(nilfs, sb, (char *)data); |
783f6184 | 1069 | if (err) |
348fe8da | 1070 | goto failed_nilfs; |
783f6184 | 1071 | |
783f6184 RK |
1072 | sb->s_op = &nilfs_sops; |
1073 | sb->s_export_op = &nilfs_export_ops; | |
1074 | sb->s_root = NULL; | |
61239230 | 1075 | sb->s_time_gran = 1; |
8de52778 | 1076 | sb->s_max_links = NILFS_LINK_MAX; |
026a7d63 | 1077 | |
26ff1304 | 1078 | sb->s_bdi = &bdev_get_queue(sb->s_bdev)->backing_dev_info; |
783f6184 | 1079 | |
f7545144 | 1080 | err = load_nilfs(nilfs, sb); |
f50a4c81 | 1081 | if (err) |
348fe8da | 1082 | goto failed_nilfs; |
f50a4c81 | 1083 | |
783f6184 | 1084 | cno = nilfs_last_cno(nilfs); |
f7545144 | 1085 | err = nilfs_attach_checkpoint(sb, cno, true, &fsroot); |
783f6184 | 1086 | if (err) { |
f11459ad RK |
1087 | printk(KERN_ERR "NILFS: error loading last checkpoint " |
1088 | "(checkpoint number=%llu).\n", (unsigned long long)cno); | |
f1e89c86 | 1089 | goto failed_unload; |
783f6184 RK |
1090 | } |
1091 | ||
1092 | if (!(sb->s_flags & MS_RDONLY)) { | |
f7545144 | 1093 | err = nilfs_attach_log_writer(sb, fsroot); |
783f6184 RK |
1094 | if (err) |
1095 | goto failed_checkpoint; | |
1096 | } | |
1097 | ||
367ea334 RK |
1098 | err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root); |
1099 | if (err) | |
783f6184 | 1100 | goto failed_segctor; |
783f6184 | 1101 | |
4d8d9293 | 1102 | nilfs_put_root(fsroot); |
783f6184 RK |
1103 | |
1104 | if (!(sb->s_flags & MS_RDONLY)) { | |
1105 | down_write(&nilfs->ns_sem); | |
f7545144 | 1106 | nilfs_setup_super(sb, true); |
783f6184 RK |
1107 | up_write(&nilfs->ns_sem); |
1108 | } | |
1109 | ||
783f6184 RK |
1110 | return 0; |
1111 | ||
783f6184 | 1112 | failed_segctor: |
f7545144 | 1113 | nilfs_detach_log_writer(sb); |
783f6184 RK |
1114 | |
1115 | failed_checkpoint: | |
4d8d9293 | 1116 | nilfs_put_root(fsroot); |
783f6184 | 1117 | |
f1e89c86 RK |
1118 | failed_unload: |
1119 | iput(nilfs->ns_sufile); | |
1120 | iput(nilfs->ns_cpfile); | |
1121 | iput(nilfs->ns_dat); | |
1122 | ||
348fe8da RK |
1123 | failed_nilfs: |
1124 | destroy_nilfs(nilfs); | |
783f6184 RK |
1125 | return err; |
1126 | } | |
1127 | ||
1128 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
1129 | { | |
e3154e97 | 1130 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 1131 | unsigned long old_sb_flags; |
06df0f99 | 1132 | unsigned long old_mount_opt; |
f11459ad | 1133 | int err; |
783f6184 | 1134 | |
02b9984d | 1135 | sync_filesystem(sb); |
783f6184 | 1136 | old_sb_flags = sb->s_flags; |
3b2ce58b | 1137 | old_mount_opt = nilfs->ns_mount_opt; |
783f6184 | 1138 | |
7c017457 | 1139 | if (!parse_options(data, sb, 1)) { |
783f6184 RK |
1140 | err = -EINVAL; |
1141 | goto restore_opts; | |
1142 | } | |
1143 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); | |
1144 | ||
d240e067 | 1145 | err = -EINVAL; |
783f6184 | 1146 | |
0234576d RK |
1147 | if (!nilfs_valid_fs(nilfs)) { |
1148 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1149 | "remount because the filesystem is in an " | |
1150 | "incomplete recovery state.\n", sb->s_id); | |
0234576d RK |
1151 | goto restore_opts; |
1152 | } | |
1153 | ||
783f6184 RK |
1154 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
1155 | goto out; | |
1156 | if (*flags & MS_RDONLY) { | |
f7545144 RK |
1157 | /* Shutting down log writer */ |
1158 | nilfs_detach_log_writer(sb); | |
783f6184 RK |
1159 | sb->s_flags |= MS_RDONLY; |
1160 | ||
783f6184 RK |
1161 | /* |
1162 | * Remounting a valid RW partition RDONLY, so set | |
1163 | * the RDONLY flag and then mark the partition as valid again. | |
1164 | */ | |
1165 | down_write(&nilfs->ns_sem); | |
f7545144 | 1166 | nilfs_cleanup_super(sb); |
783f6184 RK |
1167 | up_write(&nilfs->ns_sem); |
1168 | } else { | |
c5ca48aa | 1169 | __u64 features; |
e912a5b6 | 1170 | struct nilfs_root *root; |
c5ca48aa | 1171 | |
783f6184 RK |
1172 | /* |
1173 | * Mounting a RDONLY partition read-write, so reread and | |
1174 | * store the current valid flag. (It may have been changed | |
1175 | * by fsck since we originally mounted the partition.) | |
1176 | */ | |
c5ca48aa RK |
1177 | down_read(&nilfs->ns_sem); |
1178 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & | |
1179 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
1180 | up_read(&nilfs->ns_sem); | |
1181 | if (features) { | |
1182 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1183 | "remount RDWR because of unsupported optional " | |
1184 | "features (%llx)\n", | |
1185 | sb->s_id, (unsigned long long)features); | |
1186 | err = -EROFS; | |
1187 | goto restore_opts; | |
1188 | } | |
1189 | ||
783f6184 | 1190 | sb->s_flags &= ~MS_RDONLY; |
783f6184 | 1191 | |
2b0143b5 | 1192 | root = NILFS_I(d_inode(sb->s_root))->i_root; |
f7545144 | 1193 | err = nilfs_attach_log_writer(sb, root); |
783f6184 | 1194 | if (err) |
e59399d0 | 1195 | goto restore_opts; |
783f6184 RK |
1196 | |
1197 | down_write(&nilfs->ns_sem); | |
f7545144 | 1198 | nilfs_setup_super(sb, true); |
783f6184 | 1199 | up_write(&nilfs->ns_sem); |
783f6184 RK |
1200 | } |
1201 | out: | |
1202 | return 0; | |
1203 | ||
783f6184 RK |
1204 | restore_opts: |
1205 | sb->s_flags = old_sb_flags; | |
3b2ce58b | 1206 | nilfs->ns_mount_opt = old_mount_opt; |
783f6184 RK |
1207 | return err; |
1208 | } | |
1209 | ||
1210 | struct nilfs_super_data { | |
1211 | struct block_device *bdev; | |
1212 | __u64 cno; | |
1213 | int flags; | |
1214 | }; | |
1215 | ||
1216 | /** | |
1217 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
1218 | * @data: mount options | |
1219 | * @sd: nilfs_super_data | |
1220 | */ | |
1221 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
1222 | { | |
1223 | char *p, *options = data; | |
1224 | substring_t args[MAX_OPT_ARGS]; | |
c05dbfc2 | 1225 | int token; |
783f6184 RK |
1226 | int ret = 0; |
1227 | ||
1228 | do { | |
1229 | p = strsep(&options, ","); | |
1230 | if (p != NULL && *p) { | |
1231 | token = match_token(p, tokens, args); | |
1232 | if (token == Opt_snapshot) { | |
c05dbfc2 | 1233 | if (!(sd->flags & MS_RDONLY)) { |
783f6184 | 1234 | ret++; |
c05dbfc2 RK |
1235 | } else { |
1236 | sd->cno = simple_strtoull(args[0].from, | |
1237 | NULL, 0); | |
1238 | /* | |
1239 | * No need to see the end pointer; | |
1240 | * match_token() has done syntax | |
1241 | * checking. | |
1242 | */ | |
1243 | if (sd->cno == 0) | |
1244 | ret++; | |
783f6184 RK |
1245 | } |
1246 | } | |
1247 | if (ret) | |
1248 | printk(KERN_ERR | |
1249 | "NILFS: invalid mount option: %s\n", p); | |
1250 | } | |
1251 | if (!options) | |
1252 | break; | |
1253 | BUG_ON(options == data); | |
1254 | *(options - 1) = ','; | |
1255 | } while (!ret); | |
1256 | return ret; | |
1257 | } | |
1258 | ||
1259 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1260 | { | |
f11459ad | 1261 | s->s_bdev = data; |
783f6184 RK |
1262 | s->s_dev = s->s_bdev->bd_dev; |
1263 | return 0; | |
1264 | } | |
1265 | ||
1266 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 | 1267 | { |
f11459ad | 1268 | return (void *)s->s_bdev == data; |
783f6184 RK |
1269 | } |
1270 | ||
e4c59d61 AV |
1271 | static struct dentry * |
1272 | nilfs_mount(struct file_system_type *fs_type, int flags, | |
1273 | const char *dev_name, void *data) | |
783f6184 RK |
1274 | { |
1275 | struct nilfs_super_data sd; | |
33c8e57c | 1276 | struct super_block *s; |
d4d77629 | 1277 | fmode_t mode = FMODE_READ | FMODE_EXCL; |
f11459ad RK |
1278 | struct dentry *root_dentry; |
1279 | int err, s_new = false; | |
783f6184 | 1280 | |
13e90559 RK |
1281 | if (!(flags & MS_RDONLY)) |
1282 | mode |= FMODE_WRITE; | |
1283 | ||
d4d77629 | 1284 | sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type); |
d6d4c19c | 1285 | if (IS_ERR(sd.bdev)) |
e4c59d61 | 1286 | return ERR_CAST(sd.bdev); |
783f6184 | 1287 | |
783f6184 RK |
1288 | sd.cno = 0; |
1289 | sd.flags = flags; | |
1290 | if (nilfs_identify((char *)data, &sd)) { | |
1291 | err = -EINVAL; | |
1292 | goto failed; | |
1293 | } | |
1294 | ||
6dd47406 | 1295 | /* |
5beb6e0b RK |
1296 | * once the super is inserted into the list by sget, s_umount |
1297 | * will protect the lockfs code from trying to start a snapshot | |
1298 | * while we are mounting | |
6dd47406 | 1299 | */ |
5beb6e0b RK |
1300 | mutex_lock(&sd.bdev->bd_fsfreeze_mutex); |
1301 | if (sd.bdev->bd_fsfreeze_count > 0) { | |
1302 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); | |
1303 | err = -EBUSY; | |
1304 | goto failed; | |
1305 | } | |
9249e17f DH |
1306 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, flags, |
1307 | sd.bdev); | |
5beb6e0b | 1308 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); |
33c8e57c RK |
1309 | if (IS_ERR(s)) { |
1310 | err = PTR_ERR(s); | |
348fe8da | 1311 | goto failed; |
783f6184 RK |
1312 | } |
1313 | ||
1314 | if (!s->s_root) { | |
8fa7c320 | 1315 | s_new = true; |
f11459ad | 1316 | |
33c8e57c | 1317 | /* New superblock instance created */ |
4571b82c | 1318 | s->s_mode = mode; |
a1c6f057 | 1319 | snprintf(s->s_id, sizeof(s->s_id), "%pg", sd.bdev); |
783f6184 RK |
1320 | sb_set_blocksize(s, block_size(sd.bdev)); |
1321 | ||
348fe8da | 1322 | err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
783f6184 | 1323 | if (err) |
348fe8da | 1324 | goto failed_super; |
783f6184 RK |
1325 | |
1326 | s->s_flags |= MS_ACTIVE; | |
f11459ad | 1327 | } else if (!sd.cno) { |
e95c311e AV |
1328 | if (nilfs_tree_is_busy(s->s_root)) { |
1329 | if ((flags ^ s->s_flags) & MS_RDONLY) { | |
f11459ad RK |
1330 | printk(KERN_ERR "NILFS: the device already " |
1331 | "has a %s mount.\n", | |
1332 | (s->s_flags & MS_RDONLY) ? | |
1333 | "read-only" : "read/write"); | |
1334 | err = -EBUSY; | |
1335 | goto failed_super; | |
1336 | } | |
e95c311e | 1337 | } else { |
f11459ad RK |
1338 | /* |
1339 | * Try remount to setup mount states if the current | |
1340 | * tree is not mounted and only snapshots use this sb. | |
1341 | */ | |
1342 | err = nilfs_remount(s, &flags, data); | |
1343 | if (err) | |
1344 | goto failed_super; | |
1345 | } | |
783f6184 RK |
1346 | } |
1347 | ||
f11459ad RK |
1348 | if (sd.cno) { |
1349 | err = nilfs_attach_snapshot(s, sd.cno, &root_dentry); | |
348fe8da | 1350 | if (err) |
f11459ad | 1351 | goto failed_super; |
f11459ad RK |
1352 | } else { |
1353 | root_dentry = dget(s->s_root); | |
783f6184 RK |
1354 | } |
1355 | ||
f11459ad | 1356 | if (!s_new) |
d4d77629 | 1357 | blkdev_put(sd.bdev, mode); |
783f6184 | 1358 | |
e4c59d61 | 1359 | return root_dentry; |
783f6184 | 1360 | |
f11459ad | 1361 | failed_super: |
a95161aa | 1362 | deactivate_locked_super(s); |
783f6184 | 1363 | |
348fe8da RK |
1364 | failed: |
1365 | if (!s_new) | |
d4d77629 | 1366 | blkdev_put(sd.bdev, mode); |
e4c59d61 | 1367 | return ERR_PTR(err); |
783f6184 RK |
1368 | } |
1369 | ||
783f6184 RK |
1370 | struct file_system_type nilfs_fs_type = { |
1371 | .owner = THIS_MODULE, | |
1372 | .name = "nilfs2", | |
e4c59d61 | 1373 | .mount = nilfs_mount, |
783f6184 RK |
1374 | .kill_sb = kill_block_super, |
1375 | .fs_flags = FS_REQUIRES_DEV, | |
1376 | }; | |
7f78e035 | 1377 | MODULE_ALIAS_FS("nilfs2"); |
783f6184 | 1378 | |
41c88bd7 | 1379 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1380 | { |
41c88bd7 | 1381 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1382 | |
41c88bd7 LH |
1383 | INIT_LIST_HEAD(&ii->i_dirty); |
1384 | #ifdef CONFIG_NILFS_XATTR | |
1385 | init_rwsem(&ii->xattr_sem); | |
1386 | #endif | |
2aa15890 | 1387 | address_space_init_once(&ii->i_btnode_cache); |
05d0e94b | 1388 | ii->i_bmap = &ii->i_bmap_data; |
41c88bd7 LH |
1389 | inode_init_once(&ii->vfs_inode); |
1390 | } | |
783f6184 | 1391 | |
41c88bd7 LH |
1392 | static void nilfs_segbuf_init_once(void *obj) |
1393 | { | |
1394 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1395 | } | |
783f6184 | 1396 | |
41c88bd7 LH |
1397 | static void nilfs_destroy_cachep(void) |
1398 | { | |
8c0a8537 KS |
1399 | /* |
1400 | * Make sure all delayed rcu free inodes are flushed before we | |
1401 | * destroy cache. | |
1402 | */ | |
1403 | rcu_barrier(); | |
1404 | ||
da80a39f JL |
1405 | kmem_cache_destroy(nilfs_inode_cachep); |
1406 | kmem_cache_destroy(nilfs_transaction_cachep); | |
1407 | kmem_cache_destroy(nilfs_segbuf_cachep); | |
1408 | kmem_cache_destroy(nilfs_btree_path_cache); | |
41c88bd7 | 1409 | } |
783f6184 | 1410 | |
41c88bd7 LH |
1411 | static int __init nilfs_init_cachep(void) |
1412 | { | |
1413 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1414 | sizeof(struct nilfs_inode_info), 0, | |
5d097056 VD |
1415 | SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, |
1416 | nilfs_inode_init_once); | |
41c88bd7 LH |
1417 | if (!nilfs_inode_cachep) |
1418 | goto fail; | |
1419 | ||
1420 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1421 | sizeof(struct nilfs_transaction_info), 0, | |
1422 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1423 | if (!nilfs_transaction_cachep) | |
1424 | goto fail; | |
1425 | ||
1426 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1427 | sizeof(struct nilfs_segment_buffer), 0, | |
1428 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1429 | if (!nilfs_segbuf_cachep) | |
1430 | goto fail; | |
1431 | ||
1432 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1433 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1434 | 0, 0, NULL); | |
1435 | if (!nilfs_btree_path_cache) | |
1436 | goto fail; | |
783f6184 RK |
1437 | |
1438 | return 0; | |
1439 | ||
41c88bd7 LH |
1440 | fail: |
1441 | nilfs_destroy_cachep(); | |
1442 | return -ENOMEM; | |
1443 | } | |
1444 | ||
1445 | static int __init init_nilfs_fs(void) | |
1446 | { | |
1447 | int err; | |
783f6184 | 1448 | |
41c88bd7 LH |
1449 | err = nilfs_init_cachep(); |
1450 | if (err) | |
1451 | goto fail; | |
783f6184 | 1452 | |
dd70edbd | 1453 | err = nilfs_sysfs_init(); |
41c88bd7 LH |
1454 | if (err) |
1455 | goto free_cachep; | |
783f6184 | 1456 | |
dd70edbd VD |
1457 | err = register_filesystem(&nilfs_fs_type); |
1458 | if (err) | |
1459 | goto deinit_sysfs_entry; | |
1460 | ||
9f130263 | 1461 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1462 | return 0; |
783f6184 | 1463 | |
dd70edbd VD |
1464 | deinit_sysfs_entry: |
1465 | nilfs_sysfs_exit(); | |
41c88bd7 LH |
1466 | free_cachep: |
1467 | nilfs_destroy_cachep(); | |
1468 | fail: | |
783f6184 RK |
1469 | return err; |
1470 | } | |
1471 | ||
1472 | static void __exit exit_nilfs_fs(void) | |
1473 | { | |
41c88bd7 | 1474 | nilfs_destroy_cachep(); |
dd70edbd | 1475 | nilfs_sysfs_exit(); |
783f6184 RK |
1476 | unregister_filesystem(&nilfs_fs_type); |
1477 | } | |
1478 | ||
1479 | module_init(init_nilfs_fs) | |
1480 | module_exit(exit_nilfs_fs) |