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 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | * | |
20 | * Written by Ryusuke Konishi <ryusuke@osrg.net> | |
21 | */ | |
22 | /* | |
23 | * linux/fs/ext2/super.c | |
24 | * | |
25 | * Copyright (C) 1992, 1993, 1994, 1995 | |
26 | * Remy Card (card@masi.ibp.fr) | |
27 | * Laboratoire MASI - Institut Blaise Pascal | |
28 | * Universite Pierre et Marie Curie (Paris VI) | |
29 | * | |
30 | * from | |
31 | * | |
32 | * linux/fs/minix/inode.c | |
33 | * | |
34 | * Copyright (C) 1991, 1992 Linus Torvalds | |
35 | * | |
36 | * Big-endian to little-endian byte-swapping/bitmaps by | |
37 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
38 | */ | |
39 | ||
40 | #include <linux/module.h> | |
41 | #include <linux/string.h> | |
42 | #include <linux/slab.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/blkdev.h> | |
45 | #include <linux/parser.h> | |
46 | #include <linux/random.h> | |
47 | #include <linux/crc32.h> | |
783f6184 RK |
48 | #include <linux/vfs.h> |
49 | #include <linux/writeback.h> | |
50 | #include <linux/kobject.h> | |
b58a285b JS |
51 | #include <linux/seq_file.h> |
52 | #include <linux/mount.h> | |
783f6184 | 53 | #include "nilfs.h" |
8e656fd5 | 54 | #include "export.h" |
783f6184 RK |
55 | #include "mdt.h" |
56 | #include "alloc.h" | |
05d0e94b RK |
57 | #include "btree.h" |
58 | #include "btnode.h" | |
783f6184 RK |
59 | #include "page.h" |
60 | #include "cpfile.h" | |
61 | #include "ifile.h" | |
62 | #include "dat.h" | |
63 | #include "segment.h" | |
64 | #include "segbuf.h" | |
65 | ||
66 | MODULE_AUTHOR("NTT Corp."); | |
67 | MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem " | |
68 | "(NILFS)"); | |
783f6184 RK |
69 | MODULE_LICENSE("GPL"); |
70 | ||
abc0b50b | 71 | static struct kmem_cache *nilfs_inode_cachep; |
41c88bd7 LH |
72 | struct kmem_cache *nilfs_transaction_cachep; |
73 | struct kmem_cache *nilfs_segbuf_cachep; | |
74 | struct kmem_cache *nilfs_btree_path_cache; | |
75 | ||
5beb6e0b | 76 | static int nilfs_setup_super(struct nilfs_sb_info *sbi, int is_mount); |
783f6184 | 77 | static int nilfs_remount(struct super_block *sb, int *flags, char *data); |
783f6184 | 78 | |
c8a11c8a RK |
79 | static void nilfs_set_error(struct nilfs_sb_info *sbi) |
80 | { | |
81 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 | 82 | struct nilfs_super_block **sbp; |
c8a11c8a RK |
83 | |
84 | down_write(&nilfs->ns_sem); | |
85 | if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { | |
86 | nilfs->ns_mount_state |= NILFS_ERROR_FS; | |
b2ac86e1 | 87 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
88 | if (likely(sbp)) { |
89 | sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
b2ac86e1 JS |
90 | if (sbp[1]) |
91 | sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
92 | nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL); | |
d26493b6 | 93 | } |
c8a11c8a RK |
94 | } |
95 | up_write(&nilfs->ns_sem); | |
96 | } | |
97 | ||
783f6184 RK |
98 | /** |
99 | * nilfs_error() - report failure condition on a filesystem | |
100 | * | |
101 | * nilfs_error() sets an ERROR_FS flag on the superblock as well as | |
102 | * reporting an error message. It should be called when NILFS detects | |
103 | * incoherences or defects of meta data on disk. As for sustainable | |
104 | * errors such as a single-shot I/O error, nilfs_warning() or the printk() | |
105 | * function should be used instead. | |
106 | * | |
107 | * The segment constructor must not call this function because it can | |
108 | * kill itself. | |
109 | */ | |
110 | void nilfs_error(struct super_block *sb, const char *function, | |
111 | const char *fmt, ...) | |
112 | { | |
113 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
114 | va_list args; | |
115 | ||
116 | va_start(args, fmt); | |
117 | printk(KERN_CRIT "NILFS error (device %s): %s: ", sb->s_id, function); | |
118 | vprintk(fmt, args); | |
119 | printk("\n"); | |
120 | va_end(args); | |
121 | ||
122 | if (!(sb->s_flags & MS_RDONLY)) { | |
c8a11c8a | 123 | nilfs_set_error(sbi); |
783f6184 RK |
124 | |
125 | if (nilfs_test_opt(sbi, ERRORS_RO)) { | |
126 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
127 | sb->s_flags |= MS_RDONLY; | |
128 | } | |
129 | } | |
130 | ||
131 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) | |
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 | { | |
139 | va_list args; | |
140 | ||
141 | va_start(args, fmt); | |
142 | printk(KERN_WARNING "NILFS warning (device %s): %s: ", | |
143 | sb->s_id, function); | |
144 | vprintk(fmt, args); | |
145 | printk("\n"); | |
146 | va_end(args); | |
147 | } | |
148 | ||
783f6184 | 149 | |
2879ed66 | 150 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
783f6184 RK |
151 | { |
152 | struct nilfs_inode_info *ii; | |
153 | ||
154 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); | |
155 | if (!ii) | |
156 | return NULL; | |
157 | ii->i_bh = NULL; | |
158 | ii->i_state = 0; | |
0e14a359 | 159 | ii->i_cno = 0; |
783f6184 | 160 | ii->vfs_inode.i_version = 1; |
2879ed66 | 161 | nilfs_btnode_cache_init(&ii->i_btnode_cache, sb->s_bdi); |
783f6184 RK |
162 | return &ii->vfs_inode; |
163 | } | |
164 | ||
165 | void nilfs_destroy_inode(struct inode *inode) | |
166 | { | |
b91c9a97 RK |
167 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
168 | ||
169 | if (mdi) { | |
170 | kfree(mdi->mi_bgl); /* kfree(NULL) is safe */ | |
171 | kfree(mdi); | |
172 | } | |
783f6184 RK |
173 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
174 | } | |
175 | ||
b2ac86e1 | 176 | static int nilfs_sync_super(struct nilfs_sb_info *sbi, int flag) |
783f6184 RK |
177 | { |
178 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
179 | int err; | |
783f6184 | 180 | |
783f6184 | 181 | retry: |
e339ad31 | 182 | set_buffer_dirty(nilfs->ns_sbh[0]); |
87e99511 CH |
183 | |
184 | if (nilfs_test_opt(sbi, BARRIER)) { | |
185 | err = __sync_dirty_buffer(nilfs->ns_sbh[0], | |
186 | WRITE_SYNC | WRITE_BARRIER); | |
187 | if (err == -EOPNOTSUPP) { | |
188 | nilfs_warning(sbi->s_super, __func__, | |
189 | "barrier-based sync failed. " | |
190 | "disabling barriers\n"); | |
191 | nilfs_clear_opt(sbi, BARRIER); | |
192 | goto retry; | |
193 | } | |
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 | ||
b2ac86e1 JS |
258 | struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *sbi, |
259 | int flip) | |
783f6184 RK |
260 | { |
261 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
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 RK |
270 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", |
271 | sbi->s_super->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)) { | |
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 | ||
b2ac86e1 | 285 | int nilfs_commit_super(struct nilfs_sb_info *sbi, int flag) |
d26493b6 JS |
286 | { |
287 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
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); |
b2ac86e1 | 307 | return nilfs_sync_super(sbi, flag); |
783f6184 RK |
308 | } |
309 | ||
7ecaa46c RK |
310 | /** |
311 | * nilfs_cleanup_super() - write filesystem state for cleanup | |
312 | * @sbi: nilfs_sb_info to be unmounted or degraded to read-only | |
313 | * | |
314 | * This function restores state flags in the on-disk super block. | |
315 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the | |
316 | * filesystem was not clean previously. | |
317 | */ | |
318 | int nilfs_cleanup_super(struct nilfs_sb_info *sbi) | |
319 | { | |
d26493b6 | 320 | struct nilfs_super_block **sbp; |
b2ac86e1 | 321 | int flag = NILFS_SB_COMMIT; |
d26493b6 | 322 | int ret = -EIO; |
7ecaa46c | 323 | |
b2ac86e1 | 324 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
325 | if (sbp) { |
326 | sbp[0]->s_state = cpu_to_le16(sbi->s_nilfs->ns_mount_state); | |
b2ac86e1 JS |
327 | nilfs_set_log_cursor(sbp[0], sbi->s_nilfs); |
328 | if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { | |
329 | /* | |
330 | * make the "clean" flag also to the opposite | |
331 | * super block if both super blocks point to | |
332 | * the same checkpoint. | |
333 | */ | |
334 | sbp[1]->s_state = sbp[0]->s_state; | |
335 | flag = NILFS_SB_COMMIT_ALL; | |
336 | } | |
337 | ret = nilfs_commit_super(sbi, flag); | |
d26493b6 | 338 | } |
7ecaa46c RK |
339 | return ret; |
340 | } | |
341 | ||
783f6184 RK |
342 | static void nilfs_put_super(struct super_block *sb) |
343 | { | |
344 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
345 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
346 | ||
347 | nilfs_detach_segment_constructor(sbi); | |
348 | ||
349 | if (!(sb->s_flags & MS_RDONLY)) { | |
350 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 351 | nilfs_cleanup_super(sbi); |
783f6184 RK |
352 | up_write(&nilfs->ns_sem); |
353 | } | |
354 | ||
f1e89c86 RK |
355 | iput(nilfs->ns_sufile); |
356 | iput(nilfs->ns_cpfile); | |
357 | iput(nilfs->ns_dat); | |
358 | ||
348fe8da | 359 | destroy_nilfs(nilfs); |
783f6184 RK |
360 | sbi->s_super = NULL; |
361 | sb->s_fs_info = NULL; | |
f11459ad | 362 | kfree(sbi); |
783f6184 RK |
363 | } |
364 | ||
783f6184 RK |
365 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
366 | { | |
6233caa9 JS |
367 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
368 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 | 369 | struct nilfs_super_block **sbp; |
783f6184 RK |
370 | int err = 0; |
371 | ||
372 | /* This function is called when super block should be written back */ | |
373 | if (wait) | |
374 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
375 | |
376 | down_write(&nilfs->ns_sem); | |
d26493b6 | 377 | if (nilfs_sb_dirty(nilfs)) { |
b2ac86e1 JS |
378 | sbp = nilfs_prepare_super(sbi, nilfs_sb_will_flip(nilfs)); |
379 | if (likely(sbp)) { | |
380 | nilfs_set_log_cursor(sbp[0], nilfs); | |
381 | nilfs_commit_super(sbi, NILFS_SB_COMMIT); | |
382 | } | |
d26493b6 | 383 | } |
6233caa9 JS |
384 | up_write(&nilfs->ns_sem); |
385 | ||
783f6184 RK |
386 | return err; |
387 | } | |
388 | ||
4d8d9293 RK |
389 | int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno, int curr_mnt, |
390 | struct nilfs_root **rootp) | |
783f6184 RK |
391 | { |
392 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
4d8d9293 | 393 | struct nilfs_root *root; |
783f6184 RK |
394 | struct nilfs_checkpoint *raw_cp; |
395 | struct buffer_head *bh_cp; | |
4d8d9293 RK |
396 | int err = -ENOMEM; |
397 | ||
398 | root = nilfs_find_or_create_root( | |
399 | nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); | |
400 | if (!root) | |
401 | return err; | |
783f6184 | 402 | |
e912a5b6 RK |
403 | if (root->ifile) |
404 | goto reuse; /* already attached checkpoint */ | |
783f6184 | 405 | |
1154ecbd | 406 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
407 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
408 | &bh_cp); | |
1154ecbd | 409 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
410 | if (unlikely(err)) { |
411 | if (err == -ENOENT || err == -EINVAL) { | |
412 | printk(KERN_ERR | |
413 | "NILFS: Invalid checkpoint " | |
414 | "(checkpoint number=%llu)\n", | |
415 | (unsigned long long)cno); | |
416 | err = -EINVAL; | |
417 | } | |
418 | goto failed; | |
419 | } | |
f1e89c86 RK |
420 | |
421 | err = nilfs_ifile_read(sbi->s_super, root, nilfs->ns_inode_size, | |
422 | &raw_cp->cp_ifile_inode, &root->ifile); | |
423 | if (err) | |
783f6184 | 424 | goto failed_bh; |
b7c06342 RK |
425 | |
426 | atomic_set(&root->inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); | |
427 | atomic_set(&root->blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); | |
783f6184 RK |
428 | |
429 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
4d8d9293 | 430 | |
e912a5b6 | 431 | reuse: |
4d8d9293 | 432 | *rootp = root; |
783f6184 RK |
433 | return 0; |
434 | ||
435 | failed_bh: | |
436 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
437 | failed: | |
4d8d9293 | 438 | nilfs_put_root(root); |
783f6184 RK |
439 | |
440 | return err; | |
441 | } | |
442 | ||
5beb6e0b RK |
443 | static int nilfs_freeze(struct super_block *sb) |
444 | { | |
445 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
446 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
447 | int err; | |
448 | ||
449 | if (sb->s_flags & MS_RDONLY) | |
450 | return 0; | |
451 | ||
452 | /* Mark super block clean */ | |
453 | down_write(&nilfs->ns_sem); | |
454 | err = nilfs_cleanup_super(sbi); | |
455 | up_write(&nilfs->ns_sem); | |
456 | return err; | |
457 | } | |
458 | ||
459 | static int nilfs_unfreeze(struct super_block *sb) | |
460 | { | |
461 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
462 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
463 | ||
464 | if (sb->s_flags & MS_RDONLY) | |
465 | return 0; | |
466 | ||
467 | down_write(&nilfs->ns_sem); | |
468 | nilfs_setup_super(sbi, false); | |
469 | up_write(&nilfs->ns_sem); | |
470 | return 0; | |
471 | } | |
472 | ||
783f6184 RK |
473 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
474 | { | |
475 | struct super_block *sb = dentry->d_sb; | |
b7c06342 RK |
476 | struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root; |
477 | struct the_nilfs *nilfs = root->nilfs; | |
c306af23 | 478 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
783f6184 RK |
479 | unsigned long long blocks; |
480 | unsigned long overhead; | |
481 | unsigned long nrsvblocks; | |
482 | sector_t nfreeblocks; | |
783f6184 RK |
483 | int err; |
484 | ||
485 | /* | |
486 | * Compute all of the segment blocks | |
487 | * | |
488 | * The blocks before first segment and after last segment | |
489 | * are excluded. | |
490 | */ | |
491 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
492 | - nilfs->ns_first_data_block; | |
493 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
494 | ||
495 | /* | |
496 | * Compute the overhead | |
497 | * | |
7a65004b | 498 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
499 | * We must count them as the overhead. |
500 | */ | |
501 | overhead = 0; | |
502 | ||
503 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
504 | if (unlikely(err)) | |
505 | return err; | |
506 | ||
507 | buf->f_type = NILFS_SUPER_MAGIC; | |
508 | buf->f_bsize = sb->s_blocksize; | |
509 | buf->f_blocks = blocks - overhead; | |
510 | buf->f_bfree = nfreeblocks; | |
511 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
512 | (buf->f_bfree - nrsvblocks) : 0; | |
b7c06342 | 513 | buf->f_files = atomic_read(&root->inodes_count); |
783f6184 RK |
514 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ |
515 | buf->f_namelen = NILFS_NAME_LEN; | |
c306af23 RK |
516 | buf->f_fsid.val[0] = (u32)id; |
517 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
518 | ||
783f6184 RK |
519 | return 0; |
520 | } | |
521 | ||
b58a285b JS |
522 | static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
523 | { | |
524 | struct super_block *sb = vfs->mnt_sb; | |
525 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
f11459ad | 526 | struct nilfs_root *root = NILFS_I(vfs->mnt_root->d_inode)->i_root; |
b58a285b JS |
527 | |
528 | if (!nilfs_test_opt(sbi, BARRIER)) | |
c6b4d57d | 529 | seq_puts(seq, ",nobarrier"); |
f11459ad RK |
530 | if (root->cno != NILFS_CPTREE_CURRENT_CNO) |
531 | seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno); | |
b58a285b | 532 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) |
c6b4d57d | 533 | seq_puts(seq, ",errors=panic"); |
277a6a34 | 534 | if (nilfs_test_opt(sbi, ERRORS_CONT)) |
c6b4d57d | 535 | seq_puts(seq, ",errors=continue"); |
b58a285b | 536 | if (nilfs_test_opt(sbi, STRICT_ORDER)) |
c6b4d57d | 537 | seq_puts(seq, ",order=strict"); |
0234576d | 538 | if (nilfs_test_opt(sbi, NORECOVERY)) |
c6b4d57d | 539 | seq_puts(seq, ",norecovery"); |
e902ec99 | 540 | if (nilfs_test_opt(sbi, DISCARD)) |
c6b4d57d | 541 | seq_puts(seq, ",discard"); |
b58a285b JS |
542 | |
543 | return 0; | |
544 | } | |
545 | ||
b87221de | 546 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
547 | .alloc_inode = nilfs_alloc_inode, |
548 | .destroy_inode = nilfs_destroy_inode, | |
549 | .dirty_inode = nilfs_dirty_inode, | |
550 | /* .write_inode = nilfs_write_inode, */ | |
551 | /* .put_inode = nilfs_put_inode, */ | |
552 | /* .drop_inode = nilfs_drop_inode, */ | |
6fd1e5c9 | 553 | .evict_inode = nilfs_evict_inode, |
783f6184 | 554 | .put_super = nilfs_put_super, |
1dfa2710 | 555 | /* .write_super = nilfs_write_super, */ |
783f6184 | 556 | .sync_fs = nilfs_sync_fs, |
5beb6e0b RK |
557 | .freeze_fs = nilfs_freeze, |
558 | .unfreeze_fs = nilfs_unfreeze, | |
783f6184 RK |
559 | /* .write_super_lockfs */ |
560 | /* .unlockfs */ | |
561 | .statfs = nilfs_statfs, | |
562 | .remount_fs = nilfs_remount, | |
783f6184 | 563 | /* .umount_begin */ |
b58a285b | 564 | .show_options = nilfs_show_options |
783f6184 RK |
565 | }; |
566 | ||
783f6184 RK |
567 | enum { |
568 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
773bc4f3 | 569 | Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
802d3177 | 570 | Opt_discard, Opt_nodiscard, Opt_err, |
783f6184 RK |
571 | }; |
572 | ||
573 | static match_table_t tokens = { | |
574 | {Opt_err_cont, "errors=continue"}, | |
575 | {Opt_err_panic, "errors=panic"}, | |
576 | {Opt_err_ro, "errors=remount-ro"}, | |
773bc4f3 | 577 | {Opt_barrier, "barrier"}, |
91f1953b | 578 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
579 | {Opt_snapshot, "cp=%u"}, |
580 | {Opt_order, "order=%s"}, | |
0234576d | 581 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 582 | {Opt_discard, "discard"}, |
802d3177 | 583 | {Opt_nodiscard, "nodiscard"}, |
783f6184 RK |
584 | {Opt_err, NULL} |
585 | }; | |
586 | ||
7c017457 | 587 | static int parse_options(char *options, struct super_block *sb, int is_remount) |
783f6184 RK |
588 | { |
589 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
590 | char *p; | |
591 | substring_t args[MAX_OPT_ARGS]; | |
783f6184 RK |
592 | |
593 | if (!options) | |
594 | return 1; | |
595 | ||
596 | while ((p = strsep(&options, ",")) != NULL) { | |
597 | int token; | |
598 | if (!*p) | |
599 | continue; | |
600 | ||
601 | token = match_token(p, tokens, args); | |
602 | switch (token) { | |
773bc4f3 RK |
603 | case Opt_barrier: |
604 | nilfs_set_opt(sbi, BARRIER); | |
605 | break; | |
91f1953b JS |
606 | case Opt_nobarrier: |
607 | nilfs_clear_opt(sbi, BARRIER); | |
783f6184 RK |
608 | break; |
609 | case Opt_order: | |
610 | if (strcmp(args[0].from, "relaxed") == 0) | |
611 | /* Ordered data semantics */ | |
612 | nilfs_clear_opt(sbi, STRICT_ORDER); | |
613 | else if (strcmp(args[0].from, "strict") == 0) | |
614 | /* Strict in-order semantics */ | |
615 | nilfs_set_opt(sbi, STRICT_ORDER); | |
616 | else | |
617 | return 0; | |
618 | break; | |
619 | case Opt_err_panic: | |
620 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC); | |
621 | break; | |
622 | case Opt_err_ro: | |
623 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO); | |
624 | break; | |
625 | case Opt_err_cont: | |
626 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT); | |
627 | break; | |
628 | case Opt_snapshot: | |
7c017457 | 629 | if (is_remount) { |
f11459ad RK |
630 | printk(KERN_ERR |
631 | "NILFS: \"%s\" option is invalid " | |
632 | "for remount.\n", p); | |
783f6184 | 633 | return 0; |
7c017457 | 634 | } |
783f6184 | 635 | break; |
0234576d RK |
636 | case Opt_norecovery: |
637 | nilfs_set_opt(sbi, NORECOVERY); | |
638 | break; | |
e902ec99 JS |
639 | case Opt_discard: |
640 | nilfs_set_opt(sbi, DISCARD); | |
641 | break; | |
802d3177 RK |
642 | case Opt_nodiscard: |
643 | nilfs_clear_opt(sbi, DISCARD); | |
644 | break; | |
783f6184 RK |
645 | default: |
646 | printk(KERN_ERR | |
647 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
648 | return 0; | |
649 | } | |
650 | } | |
651 | return 1; | |
652 | } | |
653 | ||
654 | static inline void | |
655 | nilfs_set_default_options(struct nilfs_sb_info *sbi, | |
656 | struct nilfs_super_block *sbp) | |
657 | { | |
658 | sbi->s_mount_opt = | |
277a6a34 | 659 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
660 | } |
661 | ||
5beb6e0b | 662 | static int nilfs_setup_super(struct nilfs_sb_info *sbi, int is_mount) |
783f6184 RK |
663 | { |
664 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 JS |
665 | struct nilfs_super_block **sbp; |
666 | int max_mnt_count; | |
667 | int mnt_count; | |
668 | ||
669 | /* nilfs->ns_sem must be locked by the caller. */ | |
b2ac86e1 | 670 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
671 | if (!sbp) |
672 | return -EIO; | |
673 | ||
5beb6e0b RK |
674 | if (!is_mount) |
675 | goto skip_mount_setup; | |
676 | ||
d26493b6 JS |
677 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); |
678 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); | |
783f6184 | 679 | |
f50a4c81 | 680 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
783f6184 RK |
681 | printk(KERN_WARNING |
682 | "NILFS warning: mounting fs with errors\n"); | |
683 | #if 0 | |
684 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
685 | printk(KERN_WARNING | |
686 | "NILFS warning: maximal mount count reached\n"); | |
687 | #endif | |
688 | } | |
689 | if (!max_mnt_count) | |
d26493b6 | 690 | sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
783f6184 | 691 | |
d26493b6 | 692 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
5beb6e0b RK |
693 | sbp[0]->s_mtime = cpu_to_le64(get_seconds()); |
694 | ||
695 | skip_mount_setup: | |
d26493b6 JS |
696 | sbp[0]->s_state = |
697 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); | |
b2ac86e1 JS |
698 | /* synchronize sbp[1] with sbp[0] */ |
699 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
700 | return nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL); | |
783f6184 RK |
701 | } |
702 | ||
e339ad31 RK |
703 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
704 | u64 pos, int blocksize, | |
705 | struct buffer_head **pbh) | |
783f6184 | 706 | { |
e339ad31 RK |
707 | unsigned long long sb_index = pos; |
708 | unsigned long offset; | |
783f6184 | 709 | |
e339ad31 | 710 | offset = do_div(sb_index, blocksize); |
783f6184 | 711 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 712 | if (!*pbh) |
783f6184 | 713 | return NULL; |
783f6184 RK |
714 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
715 | } | |
716 | ||
783f6184 RK |
717 | int nilfs_store_magic_and_option(struct super_block *sb, |
718 | struct nilfs_super_block *sbp, | |
719 | char *data) | |
720 | { | |
721 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
722 | ||
783f6184 RK |
723 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
724 | ||
725 | /* FS independent flags */ | |
726 | #ifdef NILFS_ATIME_DISABLE | |
727 | sb->s_flags |= MS_NOATIME; | |
728 | #endif | |
729 | ||
783f6184 RK |
730 | nilfs_set_default_options(sbi, sbp); |
731 | ||
732 | sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid); | |
733 | sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid); | |
734 | sbi->s_interval = le32_to_cpu(sbp->s_c_interval); | |
735 | sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max); | |
736 | ||
7c017457 | 737 | return !parse_options(data, sb, 0) ? -EINVAL : 0 ; |
783f6184 RK |
738 | } |
739 | ||
c5ca48aa RK |
740 | int nilfs_check_feature_compatibility(struct super_block *sb, |
741 | struct nilfs_super_block *sbp) | |
742 | { | |
743 | __u64 features; | |
744 | ||
745 | features = le64_to_cpu(sbp->s_feature_incompat) & | |
746 | ~NILFS_FEATURE_INCOMPAT_SUPP; | |
747 | if (features) { | |
748 | printk(KERN_ERR "NILFS: couldn't mount because of unsupported " | |
749 | "optional features (%llx)\n", | |
750 | (unsigned long long)features); | |
751 | return -EINVAL; | |
752 | } | |
753 | features = le64_to_cpu(sbp->s_feature_compat_ro) & | |
754 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
755 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
756 | printk(KERN_ERR "NILFS: couldn't mount RDWR because of " | |
757 | "unsupported optional features (%llx)\n", | |
758 | (unsigned long long)features); | |
759 | return -EINVAL; | |
760 | } | |
761 | return 0; | |
762 | } | |
763 | ||
367ea334 RK |
764 | static int nilfs_get_root_dentry(struct super_block *sb, |
765 | struct nilfs_root *root, | |
766 | struct dentry **root_dentry) | |
767 | { | |
768 | struct inode *inode; | |
769 | struct dentry *dentry; | |
770 | int ret = 0; | |
771 | ||
772 | inode = nilfs_iget(sb, root, NILFS_ROOT_INO); | |
773 | if (IS_ERR(inode)) { | |
774 | printk(KERN_ERR "NILFS: get root inode failed\n"); | |
775 | ret = PTR_ERR(inode); | |
776 | goto out; | |
777 | } | |
778 | if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { | |
779 | iput(inode); | |
780 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); | |
781 | ret = -EINVAL; | |
782 | goto out; | |
783 | } | |
784 | ||
f11459ad RK |
785 | if (root->cno == NILFS_CPTREE_CURRENT_CNO) { |
786 | dentry = d_find_alias(inode); | |
787 | if (!dentry) { | |
788 | dentry = d_alloc_root(inode); | |
789 | if (!dentry) { | |
790 | iput(inode); | |
791 | ret = -ENOMEM; | |
792 | goto failed_dentry; | |
793 | } | |
794 | } else { | |
795 | iput(inode); | |
796 | } | |
797 | } else { | |
798 | dentry = d_obtain_alias(inode); | |
799 | if (IS_ERR(dentry)) { | |
800 | ret = PTR_ERR(dentry); | |
801 | goto failed_dentry; | |
802 | } | |
367ea334 RK |
803 | } |
804 | *root_dentry = dentry; | |
805 | out: | |
806 | return ret; | |
f11459ad RK |
807 | |
808 | failed_dentry: | |
809 | printk(KERN_ERR "NILFS: get root dentry failed\n"); | |
810 | goto out; | |
367ea334 RK |
811 | } |
812 | ||
ab4d8f7e RK |
813 | static int nilfs_attach_snapshot(struct super_block *s, __u64 cno, |
814 | struct dentry **root_dentry) | |
815 | { | |
816 | struct the_nilfs *nilfs = NILFS_SB(s)->s_nilfs; | |
817 | struct nilfs_root *root; | |
818 | int ret; | |
819 | ||
820 | down_read(&nilfs->ns_segctor_sem); | |
821 | ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno); | |
822 | up_read(&nilfs->ns_segctor_sem); | |
823 | if (ret < 0) { | |
824 | ret = (ret == -ENOENT) ? -EINVAL : ret; | |
825 | goto out; | |
826 | } else if (!ret) { | |
827 | printk(KERN_ERR "NILFS: The specified checkpoint is " | |
828 | "not a snapshot (checkpoint number=%llu).\n", | |
829 | (unsigned long long)cno); | |
830 | ret = -EINVAL; | |
831 | goto out; | |
832 | } | |
833 | ||
834 | ret = nilfs_attach_checkpoint(NILFS_SB(s), cno, false, &root); | |
835 | if (ret) { | |
836 | printk(KERN_ERR "NILFS: error loading snapshot " | |
837 | "(checkpoint number=%llu).\n", | |
838 | (unsigned long long)cno); | |
839 | goto out; | |
840 | } | |
841 | ret = nilfs_get_root_dentry(s, root, root_dentry); | |
842 | nilfs_put_root(root); | |
843 | out: | |
844 | return ret; | |
845 | } | |
846 | ||
f11459ad RK |
847 | static int nilfs_tree_was_touched(struct dentry *root_dentry) |
848 | { | |
849 | return atomic_read(&root_dentry->d_count) > 1; | |
850 | } | |
851 | ||
852 | /** | |
853 | * nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint | |
854 | * @root_dentry: root dentry of the tree to be shrunk | |
855 | * | |
856 | * This function returns true if the tree was in-use. | |
857 | */ | |
858 | static int nilfs_try_to_shrink_tree(struct dentry *root_dentry) | |
859 | { | |
860 | if (have_submounts(root_dentry)) | |
861 | return true; | |
862 | shrink_dcache_parent(root_dentry); | |
863 | return nilfs_tree_was_touched(root_dentry); | |
864 | } | |
865 | ||
032dbb3b RK |
866 | int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno) |
867 | { | |
868 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; | |
869 | struct nilfs_root *root; | |
870 | struct inode *inode; | |
871 | struct dentry *dentry; | |
872 | int ret; | |
873 | ||
874 | if (cno < 0 || cno > nilfs->ns_cno) | |
875 | return false; | |
876 | ||
877 | if (cno >= nilfs_last_cno(nilfs)) | |
878 | return true; /* protect recent checkpoints */ | |
879 | ||
880 | ret = false; | |
881 | root = nilfs_lookup_root(NILFS_SB(sb)->s_nilfs, cno); | |
882 | if (root) { | |
883 | inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO); | |
884 | if (inode) { | |
885 | dentry = d_find_alias(inode); | |
886 | if (dentry) { | |
887 | if (nilfs_tree_was_touched(dentry)) | |
888 | ret = nilfs_try_to_shrink_tree(dentry); | |
889 | dput(dentry); | |
890 | } | |
891 | iput(inode); | |
892 | } | |
893 | nilfs_put_root(root); | |
894 | } | |
895 | return ret; | |
896 | } | |
897 | ||
783f6184 RK |
898 | /** |
899 | * nilfs_fill_super() - initialize a super block instance | |
900 | * @sb: super_block | |
901 | * @data: mount options | |
902 | * @silent: silent mode flag | |
783f6184 | 903 | * |
aa7dfb89 | 904 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
905 | * So, the recovery process is protected from other simultaneous mounts. |
906 | */ | |
907 | static int | |
348fe8da | 908 | nilfs_fill_super(struct super_block *sb, void *data, int silent) |
783f6184 | 909 | { |
348fe8da | 910 | struct the_nilfs *nilfs; |
783f6184 | 911 | struct nilfs_sb_info *sbi; |
4d8d9293 | 912 | struct nilfs_root *fsroot; |
026a7d63 | 913 | struct backing_dev_info *bdi; |
783f6184 | 914 | __u64 cno; |
ab4d8f7e | 915 | int err; |
783f6184 RK |
916 | |
917 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
918 | if (!sbi) | |
919 | return -ENOMEM; | |
920 | ||
921 | sb->s_fs_info = sbi; | |
348fe8da | 922 | sbi->s_super = sb; |
783f6184 | 923 | |
348fe8da RK |
924 | nilfs = alloc_nilfs(sb->s_bdev); |
925 | if (!nilfs) { | |
926 | err = -ENOMEM; | |
927 | goto failed_sbi; | |
928 | } | |
783f6184 | 929 | sbi->s_nilfs = nilfs; |
783f6184 RK |
930 | |
931 | err = init_nilfs(nilfs, sbi, (char *)data); | |
932 | if (err) | |
348fe8da | 933 | goto failed_nilfs; |
783f6184 RK |
934 | |
935 | spin_lock_init(&sbi->s_inode_lock); | |
936 | INIT_LIST_HEAD(&sbi->s_dirty_files); | |
783f6184 RK |
937 | |
938 | /* | |
939 | * Following initialization is overlapped because | |
940 | * nilfs_sb_info structure has been cleared at the beginning. | |
941 | * But we reserve them to keep our interest and make ready | |
942 | * for the future change. | |
943 | */ | |
944 | get_random_bytes(&sbi->s_next_generation, | |
945 | sizeof(sbi->s_next_generation)); | |
946 | spin_lock_init(&sbi->s_next_gen_lock); | |
947 | ||
948 | sb->s_op = &nilfs_sops; | |
949 | sb->s_export_op = &nilfs_export_ops; | |
950 | sb->s_root = NULL; | |
61239230 | 951 | sb->s_time_gran = 1; |
026a7d63 RK |
952 | |
953 | bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info; | |
954 | sb->s_bdi = bdi ? : &default_backing_dev_info; | |
783f6184 | 955 | |
f50a4c81 RK |
956 | err = load_nilfs(nilfs, sbi); |
957 | if (err) | |
348fe8da | 958 | goto failed_nilfs; |
f50a4c81 | 959 | |
ab4d8f7e RK |
960 | cno = nilfs_last_cno(nilfs); |
961 | err = nilfs_attach_checkpoint(sbi, cno, true, &fsroot); | |
783f6184 | 962 | if (err) { |
f11459ad RK |
963 | printk(KERN_ERR "NILFS: error loading last checkpoint " |
964 | "(checkpoint number=%llu).\n", (unsigned long long)cno); | |
f1e89c86 | 965 | goto failed_unload; |
783f6184 RK |
966 | } |
967 | ||
968 | if (!(sb->s_flags & MS_RDONLY)) { | |
e912a5b6 | 969 | err = nilfs_attach_segment_constructor(sbi, fsroot); |
783f6184 RK |
970 | if (err) |
971 | goto failed_checkpoint; | |
972 | } | |
973 | ||
367ea334 RK |
974 | err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root); |
975 | if (err) | |
783f6184 | 976 | goto failed_segctor; |
783f6184 | 977 | |
4d8d9293 RK |
978 | nilfs_put_root(fsroot); |
979 | ||
783f6184 RK |
980 | if (!(sb->s_flags & MS_RDONLY)) { |
981 | down_write(&nilfs->ns_sem); | |
5beb6e0b | 982 | nilfs_setup_super(sbi, true); |
783f6184 RK |
983 | up_write(&nilfs->ns_sem); |
984 | } | |
985 | ||
783f6184 RK |
986 | return 0; |
987 | ||
783f6184 RK |
988 | failed_segctor: |
989 | nilfs_detach_segment_constructor(sbi); | |
990 | ||
991 | failed_checkpoint: | |
4d8d9293 | 992 | nilfs_put_root(fsroot); |
783f6184 | 993 | |
f1e89c86 RK |
994 | failed_unload: |
995 | iput(nilfs->ns_sufile); | |
996 | iput(nilfs->ns_cpfile); | |
997 | iput(nilfs->ns_dat); | |
998 | ||
348fe8da RK |
999 | failed_nilfs: |
1000 | destroy_nilfs(nilfs); | |
1001 | ||
783f6184 | 1002 | failed_sbi: |
783f6184 | 1003 | sb->s_fs_info = NULL; |
f11459ad | 1004 | kfree(sbi); |
783f6184 RK |
1005 | return err; |
1006 | } | |
1007 | ||
1008 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
1009 | { | |
1010 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
783f6184 RK |
1011 | struct the_nilfs *nilfs = sbi->s_nilfs; |
1012 | unsigned long old_sb_flags; | |
1013 | struct nilfs_mount_options old_opts; | |
f11459ad | 1014 | int err; |
783f6184 RK |
1015 | |
1016 | old_sb_flags = sb->s_flags; | |
1017 | old_opts.mount_opt = sbi->s_mount_opt; | |
783f6184 | 1018 | |
7c017457 | 1019 | if (!parse_options(data, sb, 1)) { |
783f6184 RK |
1020 | err = -EINVAL; |
1021 | goto restore_opts; | |
1022 | } | |
1023 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); | |
1024 | ||
d240e067 | 1025 | err = -EINVAL; |
783f6184 | 1026 | |
0234576d RK |
1027 | if (!nilfs_valid_fs(nilfs)) { |
1028 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1029 | "remount because the filesystem is in an " | |
1030 | "incomplete recovery state.\n", sb->s_id); | |
0234576d RK |
1031 | goto restore_opts; |
1032 | } | |
1033 | ||
783f6184 RK |
1034 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
1035 | goto out; | |
1036 | if (*flags & MS_RDONLY) { | |
1037 | /* Shutting down the segment constructor */ | |
1038 | nilfs_detach_segment_constructor(sbi); | |
1039 | sb->s_flags |= MS_RDONLY; | |
1040 | ||
783f6184 RK |
1041 | /* |
1042 | * Remounting a valid RW partition RDONLY, so set | |
1043 | * the RDONLY flag and then mark the partition as valid again. | |
1044 | */ | |
1045 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 1046 | nilfs_cleanup_super(sbi); |
783f6184 RK |
1047 | up_write(&nilfs->ns_sem); |
1048 | } else { | |
c5ca48aa | 1049 | __u64 features; |
e912a5b6 | 1050 | struct nilfs_root *root; |
c5ca48aa | 1051 | |
783f6184 RK |
1052 | /* |
1053 | * Mounting a RDONLY partition read-write, so reread and | |
1054 | * store the current valid flag. (It may have been changed | |
1055 | * by fsck since we originally mounted the partition.) | |
1056 | */ | |
c5ca48aa RK |
1057 | down_read(&nilfs->ns_sem); |
1058 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & | |
1059 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
1060 | up_read(&nilfs->ns_sem); | |
1061 | if (features) { | |
1062 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1063 | "remount RDWR because of unsupported optional " | |
1064 | "features (%llx)\n", | |
1065 | sb->s_id, (unsigned long long)features); | |
1066 | err = -EROFS; | |
1067 | goto restore_opts; | |
1068 | } | |
1069 | ||
783f6184 | 1070 | sb->s_flags &= ~MS_RDONLY; |
783f6184 | 1071 | |
e912a5b6 RK |
1072 | root = NILFS_I(sb->s_root->d_inode)->i_root; |
1073 | err = nilfs_attach_segment_constructor(sbi, root); | |
783f6184 | 1074 | if (err) |
e59399d0 | 1075 | goto restore_opts; |
783f6184 RK |
1076 | |
1077 | down_write(&nilfs->ns_sem); | |
5beb6e0b | 1078 | nilfs_setup_super(sbi, true); |
783f6184 | 1079 | up_write(&nilfs->ns_sem); |
783f6184 RK |
1080 | } |
1081 | out: | |
1082 | return 0; | |
1083 | ||
783f6184 RK |
1084 | restore_opts: |
1085 | sb->s_flags = old_sb_flags; | |
1086 | sbi->s_mount_opt = old_opts.mount_opt; | |
783f6184 RK |
1087 | return err; |
1088 | } | |
1089 | ||
1090 | struct nilfs_super_data { | |
1091 | struct block_device *bdev; | |
6dd47406 | 1092 | struct nilfs_sb_info *sbi; |
783f6184 RK |
1093 | __u64 cno; |
1094 | int flags; | |
1095 | }; | |
1096 | ||
1097 | /** | |
1098 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
1099 | * @data: mount options | |
1100 | * @sd: nilfs_super_data | |
1101 | */ | |
1102 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
1103 | { | |
1104 | char *p, *options = data; | |
1105 | substring_t args[MAX_OPT_ARGS]; | |
c05dbfc2 | 1106 | int token; |
783f6184 RK |
1107 | int ret = 0; |
1108 | ||
1109 | do { | |
1110 | p = strsep(&options, ","); | |
1111 | if (p != NULL && *p) { | |
1112 | token = match_token(p, tokens, args); | |
1113 | if (token == Opt_snapshot) { | |
c05dbfc2 | 1114 | if (!(sd->flags & MS_RDONLY)) { |
783f6184 | 1115 | ret++; |
c05dbfc2 RK |
1116 | } else { |
1117 | sd->cno = simple_strtoull(args[0].from, | |
1118 | NULL, 0); | |
1119 | /* | |
1120 | * No need to see the end pointer; | |
1121 | * match_token() has done syntax | |
1122 | * checking. | |
1123 | */ | |
1124 | if (sd->cno == 0) | |
1125 | ret++; | |
783f6184 RK |
1126 | } |
1127 | } | |
1128 | if (ret) | |
1129 | printk(KERN_ERR | |
1130 | "NILFS: invalid mount option: %s\n", p); | |
1131 | } | |
1132 | if (!options) | |
1133 | break; | |
1134 | BUG_ON(options == data); | |
1135 | *(options - 1) = ','; | |
1136 | } while (!ret); | |
1137 | return ret; | |
1138 | } | |
1139 | ||
1140 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1141 | { | |
f11459ad | 1142 | s->s_bdev = data; |
783f6184 RK |
1143 | s->s_dev = s->s_bdev->bd_dev; |
1144 | return 0; | |
1145 | } | |
1146 | ||
1147 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 | 1148 | { |
f11459ad | 1149 | return (void *)s->s_bdev == data; |
783f6184 RK |
1150 | } |
1151 | ||
1152 | static int | |
1153 | nilfs_get_sb(struct file_system_type *fs_type, int flags, | |
1154 | const char *dev_name, void *data, struct vfsmount *mnt) | |
1155 | { | |
1156 | struct nilfs_super_data sd; | |
33c8e57c | 1157 | struct super_block *s; |
13e90559 | 1158 | fmode_t mode = FMODE_READ; |
f11459ad RK |
1159 | struct dentry *root_dentry; |
1160 | int err, s_new = false; | |
783f6184 | 1161 | |
13e90559 RK |
1162 | if (!(flags & MS_RDONLY)) |
1163 | mode |= FMODE_WRITE; | |
1164 | ||
1165 | sd.bdev = open_bdev_exclusive(dev_name, mode, fs_type); | |
d6d4c19c | 1166 | if (IS_ERR(sd.bdev)) |
783f6184 RK |
1167 | return PTR_ERR(sd.bdev); |
1168 | ||
783f6184 RK |
1169 | sd.cno = 0; |
1170 | sd.flags = flags; | |
1171 | if (nilfs_identify((char *)data, &sd)) { | |
1172 | err = -EINVAL; | |
1173 | goto failed; | |
1174 | } | |
1175 | ||
5beb6e0b RK |
1176 | /* |
1177 | * once the super is inserted into the list by sget, s_umount | |
1178 | * will protect the lockfs code from trying to start a snapshot | |
1179 | * while we are mounting | |
1180 | */ | |
1181 | mutex_lock(&sd.bdev->bd_fsfreeze_mutex); | |
1182 | if (sd.bdev->bd_fsfreeze_count > 0) { | |
1183 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); | |
1184 | err = -EBUSY; | |
1185 | goto failed; | |
1186 | } | |
f11459ad | 1187 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev); |
5beb6e0b | 1188 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); |
33c8e57c RK |
1189 | if (IS_ERR(s)) { |
1190 | err = PTR_ERR(s); | |
348fe8da | 1191 | goto failed; |
783f6184 RK |
1192 | } |
1193 | ||
1194 | if (!s->s_root) { | |
1195 | char b[BDEVNAME_SIZE]; | |
1196 | ||
f11459ad RK |
1197 | s_new = true; |
1198 | ||
33c8e57c | 1199 | /* New superblock instance created */ |
783f6184 | 1200 | s->s_flags = flags; |
4571b82c | 1201 | s->s_mode = mode; |
783f6184 RK |
1202 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); |
1203 | sb_set_blocksize(s, block_size(sd.bdev)); | |
1204 | ||
348fe8da | 1205 | err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
783f6184 | 1206 | if (err) |
348fe8da | 1207 | goto failed_super; |
783f6184 RK |
1208 | |
1209 | s->s_flags |= MS_ACTIVE; | |
f11459ad RK |
1210 | } else if (!sd.cno) { |
1211 | int busy = false; | |
1212 | ||
1213 | if (nilfs_tree_was_touched(s->s_root)) { | |
1214 | busy = nilfs_try_to_shrink_tree(s->s_root); | |
1215 | if (busy && (flags ^ s->s_flags) & MS_RDONLY) { | |
1216 | printk(KERN_ERR "NILFS: the device already " | |
1217 | "has a %s mount.\n", | |
1218 | (s->s_flags & MS_RDONLY) ? | |
1219 | "read-only" : "read/write"); | |
1220 | err = -EBUSY; | |
1221 | goto failed_super; | |
1222 | } | |
1223 | } | |
1224 | if (!busy) { | |
1225 | /* | |
1226 | * Try remount to setup mount states if the current | |
1227 | * tree is not mounted and only snapshots use this sb. | |
1228 | */ | |
1229 | err = nilfs_remount(s, &flags, data); | |
1230 | if (err) | |
1231 | goto failed_super; | |
1232 | } | |
1233 | } | |
1234 | ||
1235 | if (sd.cno) { | |
1236 | err = nilfs_attach_snapshot(s, sd.cno, &root_dentry); | |
348fe8da | 1237 | if (err) |
f11459ad | 1238 | goto failed_super; |
f11459ad RK |
1239 | } else { |
1240 | root_dentry = dget(s->s_root); | |
783f6184 RK |
1241 | } |
1242 | ||
f11459ad | 1243 | if (!s_new) |
13e90559 | 1244 | close_bdev_exclusive(sd.bdev, mode); |
f11459ad RK |
1245 | |
1246 | mnt->mnt_sb = s; | |
1247 | mnt->mnt_root = root_dentry; | |
783f6184 RK |
1248 | return 0; |
1249 | ||
f11459ad RK |
1250 | failed_super: |
1251 | deactivate_locked_super(s); | |
783f6184 | 1252 | |
348fe8da RK |
1253 | failed: |
1254 | if (!s_new) | |
1255 | close_bdev_exclusive(sd.bdev, mode); | |
783f6184 RK |
1256 | return err; |
1257 | } | |
1258 | ||
783f6184 RK |
1259 | struct file_system_type nilfs_fs_type = { |
1260 | .owner = THIS_MODULE, | |
1261 | .name = "nilfs2", | |
1262 | .get_sb = nilfs_get_sb, | |
1263 | .kill_sb = kill_block_super, | |
1264 | .fs_flags = FS_REQUIRES_DEV, | |
1265 | }; | |
1266 | ||
41c88bd7 | 1267 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1268 | { |
41c88bd7 | 1269 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1270 | |
41c88bd7 LH |
1271 | INIT_LIST_HEAD(&ii->i_dirty); |
1272 | #ifdef CONFIG_NILFS_XATTR | |
1273 | init_rwsem(&ii->xattr_sem); | |
1274 | #endif | |
1275 | nilfs_btnode_cache_init_once(&ii->i_btnode_cache); | |
05d0e94b | 1276 | ii->i_bmap = &ii->i_bmap_data; |
41c88bd7 LH |
1277 | inode_init_once(&ii->vfs_inode); |
1278 | } | |
783f6184 | 1279 | |
41c88bd7 LH |
1280 | static void nilfs_segbuf_init_once(void *obj) |
1281 | { | |
1282 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1283 | } | |
783f6184 | 1284 | |
41c88bd7 LH |
1285 | static void nilfs_destroy_cachep(void) |
1286 | { | |
84cb0999 | 1287 | if (nilfs_inode_cachep) |
41c88bd7 | 1288 | kmem_cache_destroy(nilfs_inode_cachep); |
84cb0999 | 1289 | if (nilfs_transaction_cachep) |
41c88bd7 | 1290 | kmem_cache_destroy(nilfs_transaction_cachep); |
84cb0999 | 1291 | if (nilfs_segbuf_cachep) |
41c88bd7 | 1292 | kmem_cache_destroy(nilfs_segbuf_cachep); |
84cb0999 | 1293 | if (nilfs_btree_path_cache) |
41c88bd7 LH |
1294 | kmem_cache_destroy(nilfs_btree_path_cache); |
1295 | } | |
783f6184 | 1296 | |
41c88bd7 LH |
1297 | static int __init nilfs_init_cachep(void) |
1298 | { | |
1299 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1300 | sizeof(struct nilfs_inode_info), 0, | |
1301 | SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once); | |
1302 | if (!nilfs_inode_cachep) | |
1303 | goto fail; | |
1304 | ||
1305 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1306 | sizeof(struct nilfs_transaction_info), 0, | |
1307 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1308 | if (!nilfs_transaction_cachep) | |
1309 | goto fail; | |
1310 | ||
1311 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1312 | sizeof(struct nilfs_segment_buffer), 0, | |
1313 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1314 | if (!nilfs_segbuf_cachep) | |
1315 | goto fail; | |
1316 | ||
1317 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1318 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1319 | 0, 0, NULL); | |
1320 | if (!nilfs_btree_path_cache) | |
1321 | goto fail; | |
783f6184 RK |
1322 | |
1323 | return 0; | |
1324 | ||
41c88bd7 LH |
1325 | fail: |
1326 | nilfs_destroy_cachep(); | |
1327 | return -ENOMEM; | |
1328 | } | |
1329 | ||
1330 | static int __init init_nilfs_fs(void) | |
1331 | { | |
1332 | int err; | |
783f6184 | 1333 | |
41c88bd7 LH |
1334 | err = nilfs_init_cachep(); |
1335 | if (err) | |
1336 | goto fail; | |
783f6184 | 1337 | |
41c88bd7 LH |
1338 | err = register_filesystem(&nilfs_fs_type); |
1339 | if (err) | |
1340 | goto free_cachep; | |
783f6184 | 1341 | |
9f130263 | 1342 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1343 | return 0; |
783f6184 | 1344 | |
41c88bd7 LH |
1345 | free_cachep: |
1346 | nilfs_destroy_cachep(); | |
1347 | fail: | |
783f6184 RK |
1348 | return err; |
1349 | } | |
1350 | ||
1351 | static void __exit exit_nilfs_fs(void) | |
1352 | { | |
41c88bd7 | 1353 | nilfs_destroy_cachep(); |
783f6184 RK |
1354 | unregister_filesystem(&nilfs_fs_type); |
1355 | } | |
1356 | ||
1357 | module_init(init_nilfs_fs) | |
1358 | module_exit(exit_nilfs_fs) |