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 | ||
41c88bd7 LH |
71 | struct kmem_cache *nilfs_inode_cachep; |
72 | struct kmem_cache *nilfs_transaction_cachep; | |
73 | struct kmem_cache *nilfs_segbuf_cachep; | |
74 | struct kmem_cache *nilfs_btree_path_cache; | |
75 | ||
783f6184 | 76 | static int nilfs_remount(struct super_block *sb, int *flags, char *data); |
783f6184 | 77 | |
c8a11c8a RK |
78 | static void nilfs_set_error(struct nilfs_sb_info *sbi) |
79 | { | |
80 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 | 81 | struct nilfs_super_block **sbp; |
c8a11c8a RK |
82 | |
83 | down_write(&nilfs->ns_sem); | |
84 | if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { | |
85 | nilfs->ns_mount_state |= NILFS_ERROR_FS; | |
b2ac86e1 | 86 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
87 | if (likely(sbp)) { |
88 | sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
b2ac86e1 JS |
89 | if (sbp[1]) |
90 | sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
91 | nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL); | |
d26493b6 | 92 | } |
c8a11c8a RK |
93 | } |
94 | up_write(&nilfs->ns_sem); | |
95 | } | |
96 | ||
783f6184 RK |
97 | /** |
98 | * nilfs_error() - report failure condition on a filesystem | |
99 | * | |
100 | * nilfs_error() sets an ERROR_FS flag on the superblock as well as | |
101 | * reporting an error message. It should be called when NILFS detects | |
102 | * incoherences or defects of meta data on disk. As for sustainable | |
103 | * errors such as a single-shot I/O error, nilfs_warning() or the printk() | |
104 | * function should be used instead. | |
105 | * | |
106 | * The segment constructor must not call this function because it can | |
107 | * kill itself. | |
108 | */ | |
109 | void nilfs_error(struct super_block *sb, const char *function, | |
110 | const char *fmt, ...) | |
111 | { | |
112 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
113 | va_list args; | |
114 | ||
115 | va_start(args, fmt); | |
116 | printk(KERN_CRIT "NILFS error (device %s): %s: ", sb->s_id, function); | |
117 | vprintk(fmt, args); | |
118 | printk("\n"); | |
119 | va_end(args); | |
120 | ||
121 | if (!(sb->s_flags & MS_RDONLY)) { | |
c8a11c8a | 122 | nilfs_set_error(sbi); |
783f6184 RK |
123 | |
124 | if (nilfs_test_opt(sbi, ERRORS_RO)) { | |
125 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
126 | sb->s_flags |= MS_RDONLY; | |
127 | } | |
128 | } | |
129 | ||
130 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) | |
131 | panic("NILFS (device %s): panic forced after error\n", | |
132 | sb->s_id); | |
133 | } | |
134 | ||
135 | void nilfs_warning(struct super_block *sb, const char *function, | |
136 | const char *fmt, ...) | |
137 | { | |
138 | va_list args; | |
139 | ||
140 | va_start(args, fmt); | |
141 | printk(KERN_WARNING "NILFS warning (device %s): %s: ", | |
142 | sb->s_id, function); | |
143 | vprintk(fmt, args); | |
144 | printk("\n"); | |
145 | va_end(args); | |
146 | } | |
147 | ||
783f6184 | 148 | |
a53b4751 | 149 | struct inode *nilfs_alloc_inode_common(struct the_nilfs *nilfs) |
783f6184 RK |
150 | { |
151 | struct nilfs_inode_info *ii; | |
152 | ||
153 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); | |
154 | if (!ii) | |
155 | return NULL; | |
156 | ii->i_bh = NULL; | |
157 | ii->i_state = 0; | |
0e14a359 | 158 | ii->i_cno = 0; |
783f6184 | 159 | ii->vfs_inode.i_version = 1; |
a53b4751 | 160 | nilfs_btnode_cache_init(&ii->i_btnode_cache, nilfs->ns_bdi); |
783f6184 RK |
161 | return &ii->vfs_inode; |
162 | } | |
163 | ||
a53b4751 RK |
164 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
165 | { | |
166 | return nilfs_alloc_inode_common(NILFS_SB(sb)->s_nilfs); | |
167 | } | |
168 | ||
783f6184 RK |
169 | void nilfs_destroy_inode(struct inode *inode) |
170 | { | |
b91c9a97 RK |
171 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
172 | ||
173 | if (mdi) { | |
174 | kfree(mdi->mi_bgl); /* kfree(NULL) is safe */ | |
175 | kfree(mdi); | |
176 | } | |
783f6184 RK |
177 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
178 | } | |
179 | ||
b2ac86e1 | 180 | static int nilfs_sync_super(struct nilfs_sb_info *sbi, int flag) |
783f6184 RK |
181 | { |
182 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
183 | int err; | |
783f6184 | 184 | |
783f6184 | 185 | retry: |
e339ad31 | 186 | set_buffer_dirty(nilfs->ns_sbh[0]); |
87e99511 CH |
187 | |
188 | if (nilfs_test_opt(sbi, BARRIER)) { | |
189 | err = __sync_dirty_buffer(nilfs->ns_sbh[0], | |
190 | WRITE_SYNC | WRITE_BARRIER); | |
191 | if (err == -EOPNOTSUPP) { | |
192 | nilfs_warning(sbi->s_super, __func__, | |
193 | "barrier-based sync failed. " | |
194 | "disabling barriers\n"); | |
195 | nilfs_clear_opt(sbi, BARRIER); | |
196 | goto retry; | |
197 | } | |
198 | } else { | |
199 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); | |
783f6184 | 200 | } |
87e99511 | 201 | |
e339ad31 | 202 | if (unlikely(err)) { |
783f6184 RK |
203 | printk(KERN_ERR |
204 | "NILFS: unable to write superblock (err=%d)\n", err); | |
e339ad31 | 205 | if (err == -EIO && nilfs->ns_sbh[1]) { |
b2ac86e1 JS |
206 | /* |
207 | * sbp[0] points to newer log than sbp[1], | |
208 | * so copy sbp[0] to sbp[1] to take over sbp[0]. | |
209 | */ | |
210 | memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0], | |
211 | nilfs->ns_sbsize); | |
e339ad31 RK |
212 | nilfs_fall_back_super_block(nilfs); |
213 | goto retry; | |
214 | } | |
215 | } else { | |
216 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; | |
217 | ||
b2ac86e1 JS |
218 | nilfs->ns_sbwcount++; |
219 | ||
e339ad31 RK |
220 | /* |
221 | * The latest segment becomes trailable from the position | |
222 | * written in superblock. | |
223 | */ | |
783f6184 | 224 | clear_nilfs_discontinued(nilfs); |
e339ad31 RK |
225 | |
226 | /* update GC protection for recent segments */ | |
227 | if (nilfs->ns_sbh[1]) { | |
b2ac86e1 | 228 | if (flag == NILFS_SB_COMMIT_ALL) { |
e339ad31 | 229 | set_buffer_dirty(nilfs->ns_sbh[1]); |
b2ac86e1 JS |
230 | if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0) |
231 | goto out; | |
e339ad31 | 232 | } |
b2ac86e1 JS |
233 | if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) < |
234 | le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno)) | |
235 | sbp = nilfs->ns_sbp[1]; | |
e339ad31 | 236 | } |
783f6184 | 237 | |
b2ac86e1 JS |
238 | spin_lock(&nilfs->ns_last_segment_lock); |
239 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); | |
240 | spin_unlock(&nilfs->ns_last_segment_lock); | |
241 | } | |
242 | out: | |
783f6184 RK |
243 | return err; |
244 | } | |
245 | ||
60f46b7e RK |
246 | void nilfs_set_log_cursor(struct nilfs_super_block *sbp, |
247 | struct the_nilfs *nilfs) | |
248 | { | |
249 | sector_t nfreeblocks; | |
250 | ||
251 | /* nilfs->ns_sem must be locked by the caller. */ | |
252 | nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
253 | sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
254 | ||
255 | spin_lock(&nilfs->ns_last_segment_lock); | |
256 | sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
257 | sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
258 | sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
259 | spin_unlock(&nilfs->ns_last_segment_lock); | |
260 | } | |
261 | ||
b2ac86e1 JS |
262 | struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *sbi, |
263 | int flip) | |
783f6184 RK |
264 | { |
265 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
e339ad31 | 266 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 267 | |
d26493b6 | 268 | /* nilfs->ns_sem must be locked by the caller. */ |
34cb9b5c | 269 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
d26493b6 JS |
270 | if (sbp[1] && |
271 | sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
b2ac86e1 | 272 | memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); |
d26493b6 | 273 | } else { |
e339ad31 RK |
274 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", |
275 | sbi->s_super->s_id); | |
d26493b6 | 276 | return NULL; |
e339ad31 | 277 | } |
b2ac86e1 JS |
278 | } else if (sbp[1] && |
279 | sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
280 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
e339ad31 | 281 | } |
b2ac86e1 JS |
282 | |
283 | if (flip && sbp[1]) | |
284 | nilfs_swap_super_block(nilfs); | |
285 | ||
d26493b6 JS |
286 | return sbp; |
287 | } | |
288 | ||
b2ac86e1 | 289 | int nilfs_commit_super(struct nilfs_sb_info *sbi, int flag) |
d26493b6 JS |
290 | { |
291 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
292 | struct nilfs_super_block **sbp = nilfs->ns_sbp; | |
293 | time_t t; | |
294 | ||
295 | /* nilfs->ns_sem must be locked by the caller. */ | |
e339ad31 | 296 | t = get_seconds(); |
b2ac86e1 | 297 | nilfs->ns_sbwtime = t; |
e339ad31 RK |
298 | sbp[0]->s_wtime = cpu_to_le64(t); |
299 | sbp[0]->s_sum = 0; | |
300 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
301 | (unsigned char *)sbp[0], | |
302 | nilfs->ns_sbsize)); | |
b2ac86e1 JS |
303 | if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) { |
304 | sbp[1]->s_wtime = sbp[0]->s_wtime; | |
305 | sbp[1]->s_sum = 0; | |
306 | sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
307 | (unsigned char *)sbp[1], | |
308 | nilfs->ns_sbsize)); | |
e339ad31 | 309 | } |
e605f0a7 | 310 | clear_nilfs_sb_dirty(nilfs); |
b2ac86e1 | 311 | return nilfs_sync_super(sbi, flag); |
783f6184 RK |
312 | } |
313 | ||
7ecaa46c RK |
314 | /** |
315 | * nilfs_cleanup_super() - write filesystem state for cleanup | |
316 | * @sbi: nilfs_sb_info to be unmounted or degraded to read-only | |
317 | * | |
318 | * This function restores state flags in the on-disk super block. | |
319 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the | |
320 | * filesystem was not clean previously. | |
321 | */ | |
322 | int nilfs_cleanup_super(struct nilfs_sb_info *sbi) | |
323 | { | |
d26493b6 | 324 | struct nilfs_super_block **sbp; |
b2ac86e1 | 325 | int flag = NILFS_SB_COMMIT; |
d26493b6 | 326 | int ret = -EIO; |
7ecaa46c | 327 | |
b2ac86e1 | 328 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
329 | if (sbp) { |
330 | sbp[0]->s_state = cpu_to_le16(sbi->s_nilfs->ns_mount_state); | |
b2ac86e1 JS |
331 | nilfs_set_log_cursor(sbp[0], sbi->s_nilfs); |
332 | if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { | |
333 | /* | |
334 | * make the "clean" flag also to the opposite | |
335 | * super block if both super blocks point to | |
336 | * the same checkpoint. | |
337 | */ | |
338 | sbp[1]->s_state = sbp[0]->s_state; | |
339 | flag = NILFS_SB_COMMIT_ALL; | |
340 | } | |
341 | ret = nilfs_commit_super(sbi, flag); | |
d26493b6 | 342 | } |
7ecaa46c RK |
343 | return ret; |
344 | } | |
345 | ||
783f6184 RK |
346 | static void nilfs_put_super(struct super_block *sb) |
347 | { | |
348 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
349 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
350 | ||
351 | nilfs_detach_segment_constructor(sbi); | |
352 | ||
353 | if (!(sb->s_flags & MS_RDONLY)) { | |
354 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 355 | nilfs_cleanup_super(sbi); |
783f6184 RK |
356 | up_write(&nilfs->ns_sem); |
357 | } | |
e59399d0 | 358 | down_write(&nilfs->ns_super_sem); |
3f82ff55 RK |
359 | if (nilfs->ns_current == sbi) |
360 | nilfs->ns_current = NULL; | |
e912a5b6 | 361 | list_del_init(&sbi->s_list); |
e59399d0 | 362 | up_write(&nilfs->ns_super_sem); |
783f6184 | 363 | |
783f6184 RK |
364 | put_nilfs(sbi->s_nilfs); |
365 | sbi->s_super = NULL; | |
366 | sb->s_fs_info = NULL; | |
6dd47406 | 367 | nilfs_put_sbinfo(sbi); |
783f6184 RK |
368 | } |
369 | ||
783f6184 RK |
370 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
371 | { | |
6233caa9 JS |
372 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
373 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 | 374 | struct nilfs_super_block **sbp; |
783f6184 RK |
375 | int err = 0; |
376 | ||
377 | /* This function is called when super block should be written back */ | |
378 | if (wait) | |
379 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
380 | |
381 | down_write(&nilfs->ns_sem); | |
d26493b6 | 382 | if (nilfs_sb_dirty(nilfs)) { |
b2ac86e1 JS |
383 | sbp = nilfs_prepare_super(sbi, nilfs_sb_will_flip(nilfs)); |
384 | if (likely(sbp)) { | |
385 | nilfs_set_log_cursor(sbp[0], nilfs); | |
386 | nilfs_commit_super(sbi, NILFS_SB_COMMIT); | |
387 | } | |
d26493b6 | 388 | } |
6233caa9 JS |
389 | up_write(&nilfs->ns_sem); |
390 | ||
783f6184 RK |
391 | return err; |
392 | } | |
393 | ||
4d8d9293 RK |
394 | int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno, int curr_mnt, |
395 | struct nilfs_root **rootp) | |
783f6184 RK |
396 | { |
397 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
4d8d9293 | 398 | struct nilfs_root *root; |
783f6184 RK |
399 | struct nilfs_checkpoint *raw_cp; |
400 | struct buffer_head *bh_cp; | |
4d8d9293 RK |
401 | int err = -ENOMEM; |
402 | ||
403 | root = nilfs_find_or_create_root( | |
404 | nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); | |
405 | if (!root) | |
406 | return err; | |
783f6184 | 407 | |
e912a5b6 RK |
408 | if (root->ifile) |
409 | goto reuse; /* already attached checkpoint */ | |
783f6184 | 410 | |
e912a5b6 RK |
411 | root->ifile = nilfs_ifile_new(sbi, nilfs->ns_inode_size); |
412 | if (!root->ifile) | |
413 | goto failed; | |
783f6184 | 414 | |
1154ecbd | 415 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
416 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
417 | &bh_cp); | |
1154ecbd | 418 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
419 | if (unlikely(err)) { |
420 | if (err == -ENOENT || err == -EINVAL) { | |
421 | printk(KERN_ERR | |
422 | "NILFS: Invalid checkpoint " | |
423 | "(checkpoint number=%llu)\n", | |
424 | (unsigned long long)cno); | |
425 | err = -EINVAL; | |
426 | } | |
427 | goto failed; | |
428 | } | |
e912a5b6 | 429 | err = nilfs_read_inode_common(root->ifile, &raw_cp->cp_ifile_inode); |
783f6184 RK |
430 | if (unlikely(err)) |
431 | goto failed_bh; | |
b7c06342 RK |
432 | |
433 | atomic_set(&root->inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); | |
434 | atomic_set(&root->blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); | |
783f6184 RK |
435 | |
436 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
4d8d9293 | 437 | |
e912a5b6 | 438 | reuse: |
4d8d9293 | 439 | *rootp = root; |
783f6184 RK |
440 | return 0; |
441 | ||
442 | failed_bh: | |
443 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
444 | failed: | |
4d8d9293 | 445 | nilfs_put_root(root); |
783f6184 RK |
446 | |
447 | return err; | |
448 | } | |
449 | ||
783f6184 RK |
450 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
451 | { | |
452 | struct super_block *sb = dentry->d_sb; | |
b7c06342 RK |
453 | struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root; |
454 | struct the_nilfs *nilfs = root->nilfs; | |
c306af23 | 455 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
783f6184 RK |
456 | unsigned long long blocks; |
457 | unsigned long overhead; | |
458 | unsigned long nrsvblocks; | |
459 | sector_t nfreeblocks; | |
783f6184 RK |
460 | int err; |
461 | ||
462 | /* | |
463 | * Compute all of the segment blocks | |
464 | * | |
465 | * The blocks before first segment and after last segment | |
466 | * are excluded. | |
467 | */ | |
468 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
469 | - nilfs->ns_first_data_block; | |
470 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
471 | ||
472 | /* | |
473 | * Compute the overhead | |
474 | * | |
7a65004b | 475 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
476 | * We must count them as the overhead. |
477 | */ | |
478 | overhead = 0; | |
479 | ||
480 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
481 | if (unlikely(err)) | |
482 | return err; | |
483 | ||
484 | buf->f_type = NILFS_SUPER_MAGIC; | |
485 | buf->f_bsize = sb->s_blocksize; | |
486 | buf->f_blocks = blocks - overhead; | |
487 | buf->f_bfree = nfreeblocks; | |
488 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
489 | (buf->f_bfree - nrsvblocks) : 0; | |
b7c06342 | 490 | buf->f_files = atomic_read(&root->inodes_count); |
783f6184 RK |
491 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ |
492 | buf->f_namelen = NILFS_NAME_LEN; | |
c306af23 RK |
493 | buf->f_fsid.val[0] = (u32)id; |
494 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
495 | ||
783f6184 RK |
496 | return 0; |
497 | } | |
498 | ||
b58a285b JS |
499 | static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
500 | { | |
501 | struct super_block *sb = vfs->mnt_sb; | |
502 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
503 | ||
504 | if (!nilfs_test_opt(sbi, BARRIER)) | |
c6b4d57d | 505 | seq_puts(seq, ",nobarrier"); |
b58a285b JS |
506 | if (nilfs_test_opt(sbi, SNAPSHOT)) |
507 | seq_printf(seq, ",cp=%llu", | |
508 | (unsigned long long int)sbi->s_snapshot_cno); | |
b58a285b | 509 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) |
c6b4d57d | 510 | seq_puts(seq, ",errors=panic"); |
277a6a34 | 511 | if (nilfs_test_opt(sbi, ERRORS_CONT)) |
c6b4d57d | 512 | seq_puts(seq, ",errors=continue"); |
b58a285b | 513 | if (nilfs_test_opt(sbi, STRICT_ORDER)) |
c6b4d57d | 514 | seq_puts(seq, ",order=strict"); |
0234576d | 515 | if (nilfs_test_opt(sbi, NORECOVERY)) |
c6b4d57d | 516 | seq_puts(seq, ",norecovery"); |
e902ec99 | 517 | if (nilfs_test_opt(sbi, DISCARD)) |
c6b4d57d | 518 | seq_puts(seq, ",discard"); |
b58a285b JS |
519 | |
520 | return 0; | |
521 | } | |
522 | ||
b87221de | 523 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
524 | .alloc_inode = nilfs_alloc_inode, |
525 | .destroy_inode = nilfs_destroy_inode, | |
526 | .dirty_inode = nilfs_dirty_inode, | |
527 | /* .write_inode = nilfs_write_inode, */ | |
528 | /* .put_inode = nilfs_put_inode, */ | |
529 | /* .drop_inode = nilfs_drop_inode, */ | |
6fd1e5c9 | 530 | .evict_inode = nilfs_evict_inode, |
783f6184 | 531 | .put_super = nilfs_put_super, |
1dfa2710 | 532 | /* .write_super = nilfs_write_super, */ |
783f6184 RK |
533 | .sync_fs = nilfs_sync_fs, |
534 | /* .write_super_lockfs */ | |
535 | /* .unlockfs */ | |
536 | .statfs = nilfs_statfs, | |
537 | .remount_fs = nilfs_remount, | |
783f6184 | 538 | /* .umount_begin */ |
b58a285b | 539 | .show_options = nilfs_show_options |
783f6184 RK |
540 | }; |
541 | ||
783f6184 RK |
542 | enum { |
543 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
773bc4f3 | 544 | Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
802d3177 | 545 | Opt_discard, Opt_nodiscard, Opt_err, |
783f6184 RK |
546 | }; |
547 | ||
548 | static match_table_t tokens = { | |
549 | {Opt_err_cont, "errors=continue"}, | |
550 | {Opt_err_panic, "errors=panic"}, | |
551 | {Opt_err_ro, "errors=remount-ro"}, | |
773bc4f3 | 552 | {Opt_barrier, "barrier"}, |
91f1953b | 553 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
554 | {Opt_snapshot, "cp=%u"}, |
555 | {Opt_order, "order=%s"}, | |
0234576d | 556 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 557 | {Opt_discard, "discard"}, |
802d3177 | 558 | {Opt_nodiscard, "nodiscard"}, |
783f6184 RK |
559 | {Opt_err, NULL} |
560 | }; | |
561 | ||
7c017457 | 562 | static int parse_options(char *options, struct super_block *sb, int is_remount) |
783f6184 RK |
563 | { |
564 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
565 | char *p; | |
566 | substring_t args[MAX_OPT_ARGS]; | |
567 | int option; | |
568 | ||
569 | if (!options) | |
570 | return 1; | |
571 | ||
572 | while ((p = strsep(&options, ",")) != NULL) { | |
573 | int token; | |
574 | if (!*p) | |
575 | continue; | |
576 | ||
577 | token = match_token(p, tokens, args); | |
578 | switch (token) { | |
773bc4f3 RK |
579 | case Opt_barrier: |
580 | nilfs_set_opt(sbi, BARRIER); | |
581 | break; | |
91f1953b JS |
582 | case Opt_nobarrier: |
583 | nilfs_clear_opt(sbi, BARRIER); | |
783f6184 RK |
584 | break; |
585 | case Opt_order: | |
586 | if (strcmp(args[0].from, "relaxed") == 0) | |
587 | /* Ordered data semantics */ | |
588 | nilfs_clear_opt(sbi, STRICT_ORDER); | |
589 | else if (strcmp(args[0].from, "strict") == 0) | |
590 | /* Strict in-order semantics */ | |
591 | nilfs_set_opt(sbi, STRICT_ORDER); | |
592 | else | |
593 | return 0; | |
594 | break; | |
595 | case Opt_err_panic: | |
596 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC); | |
597 | break; | |
598 | case Opt_err_ro: | |
599 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO); | |
600 | break; | |
601 | case Opt_err_cont: | |
602 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT); | |
603 | break; | |
604 | case Opt_snapshot: | |
605 | if (match_int(&args[0], &option) || option <= 0) | |
606 | return 0; | |
7c017457 RK |
607 | if (is_remount) { |
608 | if (!nilfs_test_opt(sbi, SNAPSHOT)) { | |
609 | printk(KERN_ERR | |
610 | "NILFS: cannot change regular " | |
611 | "mount to snapshot.\n"); | |
612 | return 0; | |
613 | } else if (option != sbi->s_snapshot_cno) { | |
614 | printk(KERN_ERR | |
615 | "NILFS: cannot remount to a " | |
616 | "different snapshot.\n"); | |
617 | return 0; | |
618 | } | |
619 | break; | |
620 | } | |
621 | if (!(sb->s_flags & MS_RDONLY)) { | |
622 | printk(KERN_ERR "NILFS: cannot mount snapshot " | |
623 | "read/write. A read-only option is " | |
624 | "required.\n"); | |
783f6184 | 625 | return 0; |
7c017457 | 626 | } |
783f6184 RK |
627 | sbi->s_snapshot_cno = option; |
628 | nilfs_set_opt(sbi, SNAPSHOT); | |
629 | break; | |
0234576d RK |
630 | case Opt_norecovery: |
631 | nilfs_set_opt(sbi, NORECOVERY); | |
632 | break; | |
e902ec99 JS |
633 | case Opt_discard: |
634 | nilfs_set_opt(sbi, DISCARD); | |
635 | break; | |
802d3177 RK |
636 | case Opt_nodiscard: |
637 | nilfs_clear_opt(sbi, DISCARD); | |
638 | break; | |
783f6184 RK |
639 | default: |
640 | printk(KERN_ERR | |
641 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
642 | return 0; | |
643 | } | |
644 | } | |
645 | return 1; | |
646 | } | |
647 | ||
648 | static inline void | |
649 | nilfs_set_default_options(struct nilfs_sb_info *sbi, | |
650 | struct nilfs_super_block *sbp) | |
651 | { | |
652 | sbi->s_mount_opt = | |
277a6a34 | 653 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
654 | } |
655 | ||
656 | static int nilfs_setup_super(struct nilfs_sb_info *sbi) | |
657 | { | |
658 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 JS |
659 | struct nilfs_super_block **sbp; |
660 | int max_mnt_count; | |
661 | int mnt_count; | |
662 | ||
663 | /* nilfs->ns_sem must be locked by the caller. */ | |
b2ac86e1 | 664 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
665 | if (!sbp) |
666 | return -EIO; | |
667 | ||
668 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); | |
669 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); | |
783f6184 | 670 | |
f50a4c81 | 671 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
783f6184 RK |
672 | printk(KERN_WARNING |
673 | "NILFS warning: mounting fs with errors\n"); | |
674 | #if 0 | |
675 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
676 | printk(KERN_WARNING | |
677 | "NILFS warning: maximal mount count reached\n"); | |
678 | #endif | |
679 | } | |
680 | if (!max_mnt_count) | |
d26493b6 | 681 | sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
783f6184 | 682 | |
d26493b6 JS |
683 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
684 | sbp[0]->s_state = | |
685 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); | |
686 | sbp[0]->s_mtime = cpu_to_le64(get_seconds()); | |
b2ac86e1 JS |
687 | /* synchronize sbp[1] with sbp[0] */ |
688 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
689 | return nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL); | |
783f6184 RK |
690 | } |
691 | ||
e339ad31 RK |
692 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
693 | u64 pos, int blocksize, | |
694 | struct buffer_head **pbh) | |
783f6184 | 695 | { |
e339ad31 RK |
696 | unsigned long long sb_index = pos; |
697 | unsigned long offset; | |
783f6184 | 698 | |
e339ad31 | 699 | offset = do_div(sb_index, blocksize); |
783f6184 | 700 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 701 | if (!*pbh) |
783f6184 | 702 | return NULL; |
783f6184 RK |
703 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
704 | } | |
705 | ||
783f6184 RK |
706 | int nilfs_store_magic_and_option(struct super_block *sb, |
707 | struct nilfs_super_block *sbp, | |
708 | char *data) | |
709 | { | |
710 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
711 | ||
783f6184 RK |
712 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
713 | ||
714 | /* FS independent flags */ | |
715 | #ifdef NILFS_ATIME_DISABLE | |
716 | sb->s_flags |= MS_NOATIME; | |
717 | #endif | |
718 | ||
783f6184 RK |
719 | nilfs_set_default_options(sbi, sbp); |
720 | ||
721 | sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid); | |
722 | sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid); | |
723 | sbi->s_interval = le32_to_cpu(sbp->s_c_interval); | |
724 | sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max); | |
725 | ||
7c017457 | 726 | return !parse_options(data, sb, 0) ? -EINVAL : 0 ; |
783f6184 RK |
727 | } |
728 | ||
c5ca48aa RK |
729 | int nilfs_check_feature_compatibility(struct super_block *sb, |
730 | struct nilfs_super_block *sbp) | |
731 | { | |
732 | __u64 features; | |
733 | ||
734 | features = le64_to_cpu(sbp->s_feature_incompat) & | |
735 | ~NILFS_FEATURE_INCOMPAT_SUPP; | |
736 | if (features) { | |
737 | printk(KERN_ERR "NILFS: couldn't mount because of unsupported " | |
738 | "optional features (%llx)\n", | |
739 | (unsigned long long)features); | |
740 | return -EINVAL; | |
741 | } | |
742 | features = le64_to_cpu(sbp->s_feature_compat_ro) & | |
743 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
744 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
745 | printk(KERN_ERR "NILFS: couldn't mount RDWR because of " | |
746 | "unsupported optional features (%llx)\n", | |
747 | (unsigned long long)features); | |
748 | return -EINVAL; | |
749 | } | |
750 | return 0; | |
751 | } | |
752 | ||
783f6184 RK |
753 | /** |
754 | * nilfs_fill_super() - initialize a super block instance | |
755 | * @sb: super_block | |
756 | * @data: mount options | |
757 | * @silent: silent mode flag | |
758 | * @nilfs: the_nilfs struct | |
759 | * | |
aa7dfb89 | 760 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
761 | * So, the recovery process is protected from other simultaneous mounts. |
762 | */ | |
763 | static int | |
764 | nilfs_fill_super(struct super_block *sb, void *data, int silent, | |
765 | struct the_nilfs *nilfs) | |
766 | { | |
767 | struct nilfs_sb_info *sbi; | |
4d8d9293 | 768 | struct nilfs_root *fsroot; |
783f6184 RK |
769 | struct inode *root; |
770 | __u64 cno; | |
4d8d9293 | 771 | int err, curr_mnt; |
783f6184 RK |
772 | |
773 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
774 | if (!sbi) | |
775 | return -ENOMEM; | |
776 | ||
777 | sb->s_fs_info = sbi; | |
778 | ||
779 | get_nilfs(nilfs); | |
780 | sbi->s_nilfs = nilfs; | |
781 | sbi->s_super = sb; | |
6dd47406 | 782 | atomic_set(&sbi->s_count, 1); |
783f6184 RK |
783 | |
784 | err = init_nilfs(nilfs, sbi, (char *)data); | |
785 | if (err) | |
786 | goto failed_sbi; | |
787 | ||
788 | spin_lock_init(&sbi->s_inode_lock); | |
789 | INIT_LIST_HEAD(&sbi->s_dirty_files); | |
790 | INIT_LIST_HEAD(&sbi->s_list); | |
791 | ||
792 | /* | |
793 | * Following initialization is overlapped because | |
794 | * nilfs_sb_info structure has been cleared at the beginning. | |
795 | * But we reserve them to keep our interest and make ready | |
796 | * for the future change. | |
797 | */ | |
798 | get_random_bytes(&sbi->s_next_generation, | |
799 | sizeof(sbi->s_next_generation)); | |
800 | spin_lock_init(&sbi->s_next_gen_lock); | |
801 | ||
802 | sb->s_op = &nilfs_sops; | |
803 | sb->s_export_op = &nilfs_export_ops; | |
804 | sb->s_root = NULL; | |
61239230 | 805 | sb->s_time_gran = 1; |
973bec34 | 806 | sb->s_bdi = nilfs->ns_bdi; |
783f6184 | 807 | |
f50a4c81 RK |
808 | err = load_nilfs(nilfs, sbi); |
809 | if (err) | |
810 | goto failed_sbi; | |
811 | ||
783f6184 | 812 | cno = nilfs_last_cno(nilfs); |
4d8d9293 | 813 | curr_mnt = true; |
783f6184 RK |
814 | |
815 | if (sb->s_flags & MS_RDONLY) { | |
816 | if (nilfs_test_opt(sbi, SNAPSHOT)) { | |
43be0ec0 | 817 | down_read(&nilfs->ns_segctor_sem); |
1f5abe7e RK |
818 | err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, |
819 | sbi->s_snapshot_cno); | |
43be0ec0 ZY |
820 | up_read(&nilfs->ns_segctor_sem); |
821 | if (err < 0) { | |
822 | if (err == -ENOENT) | |
823 | err = -EINVAL; | |
1f5abe7e | 824 | goto failed_sbi; |
43be0ec0 | 825 | } |
1f5abe7e | 826 | if (!err) { |
783f6184 RK |
827 | printk(KERN_ERR |
828 | "NILFS: The specified checkpoint is " | |
829 | "not a snapshot " | |
830 | "(checkpoint number=%llu).\n", | |
831 | (unsigned long long)sbi->s_snapshot_cno); | |
832 | err = -EINVAL; | |
833 | goto failed_sbi; | |
834 | } | |
835 | cno = sbi->s_snapshot_cno; | |
4d8d9293 | 836 | curr_mnt = false; |
d240e067 | 837 | } |
783f6184 RK |
838 | } |
839 | ||
4d8d9293 | 840 | err = nilfs_attach_checkpoint(sbi, cno, curr_mnt, &fsroot); |
783f6184 RK |
841 | if (err) { |
842 | printk(KERN_ERR "NILFS: error loading a checkpoint" | |
843 | " (checkpoint number=%llu).\n", (unsigned long long)cno); | |
844 | goto failed_sbi; | |
845 | } | |
846 | ||
847 | if (!(sb->s_flags & MS_RDONLY)) { | |
e912a5b6 | 848 | err = nilfs_attach_segment_constructor(sbi, fsroot); |
783f6184 RK |
849 | if (err) |
850 | goto failed_checkpoint; | |
851 | } | |
852 | ||
4d8d9293 | 853 | root = nilfs_iget(sb, fsroot, NILFS_ROOT_INO); |
783f6184 RK |
854 | if (IS_ERR(root)) { |
855 | printk(KERN_ERR "NILFS: get root inode failed\n"); | |
856 | err = PTR_ERR(root); | |
857 | goto failed_segctor; | |
858 | } | |
859 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
860 | iput(root); | |
861 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); | |
862 | err = -EINVAL; | |
863 | goto failed_segctor; | |
864 | } | |
865 | sb->s_root = d_alloc_root(root); | |
866 | if (!sb->s_root) { | |
867 | iput(root); | |
868 | printk(KERN_ERR "NILFS: get root dentry failed\n"); | |
869 | err = -ENOMEM; | |
870 | goto failed_segctor; | |
871 | } | |
872 | ||
4d8d9293 RK |
873 | nilfs_put_root(fsroot); |
874 | ||
783f6184 RK |
875 | if (!(sb->s_flags & MS_RDONLY)) { |
876 | down_write(&nilfs->ns_sem); | |
877 | nilfs_setup_super(sbi); | |
878 | up_write(&nilfs->ns_sem); | |
879 | } | |
880 | ||
e59399d0 | 881 | down_write(&nilfs->ns_super_sem); |
e912a5b6 | 882 | list_add(&sbi->s_list, &nilfs->ns_supers); |
3f82ff55 RK |
883 | if (!nilfs_test_opt(sbi, SNAPSHOT)) |
884 | nilfs->ns_current = sbi; | |
e59399d0 | 885 | up_write(&nilfs->ns_super_sem); |
3f82ff55 | 886 | |
783f6184 RK |
887 | return 0; |
888 | ||
783f6184 RK |
889 | failed_segctor: |
890 | nilfs_detach_segment_constructor(sbi); | |
891 | ||
892 | failed_checkpoint: | |
4d8d9293 | 893 | nilfs_put_root(fsroot); |
783f6184 RK |
894 | |
895 | failed_sbi: | |
896 | put_nilfs(nilfs); | |
897 | sb->s_fs_info = NULL; | |
6dd47406 | 898 | nilfs_put_sbinfo(sbi); |
783f6184 RK |
899 | return err; |
900 | } | |
901 | ||
902 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
903 | { | |
904 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
783f6184 RK |
905 | struct the_nilfs *nilfs = sbi->s_nilfs; |
906 | unsigned long old_sb_flags; | |
907 | struct nilfs_mount_options old_opts; | |
d240e067 | 908 | int was_snapshot, err; |
783f6184 | 909 | |
e59399d0 | 910 | down_write(&nilfs->ns_super_sem); |
783f6184 RK |
911 | old_sb_flags = sb->s_flags; |
912 | old_opts.mount_opt = sbi->s_mount_opt; | |
913 | old_opts.snapshot_cno = sbi->s_snapshot_cno; | |
d240e067 | 914 | was_snapshot = nilfs_test_opt(sbi, SNAPSHOT); |
783f6184 | 915 | |
7c017457 | 916 | if (!parse_options(data, sb, 1)) { |
783f6184 RK |
917 | err = -EINVAL; |
918 | goto restore_opts; | |
919 | } | |
920 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); | |
921 | ||
d240e067 | 922 | err = -EINVAL; |
7c017457 RK |
923 | if (was_snapshot && !(*flags & MS_RDONLY)) { |
924 | printk(KERN_ERR "NILFS (device %s): cannot remount snapshot " | |
925 | "read/write.\n", sb->s_id); | |
926 | goto restore_opts; | |
783f6184 RK |
927 | } |
928 | ||
0234576d RK |
929 | if (!nilfs_valid_fs(nilfs)) { |
930 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
931 | "remount because the filesystem is in an " | |
932 | "incomplete recovery state.\n", sb->s_id); | |
0234576d RK |
933 | goto restore_opts; |
934 | } | |
935 | ||
783f6184 RK |
936 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
937 | goto out; | |
938 | if (*flags & MS_RDONLY) { | |
939 | /* Shutting down the segment constructor */ | |
940 | nilfs_detach_segment_constructor(sbi); | |
941 | sb->s_flags |= MS_RDONLY; | |
942 | ||
783f6184 RK |
943 | /* |
944 | * Remounting a valid RW partition RDONLY, so set | |
945 | * the RDONLY flag and then mark the partition as valid again. | |
946 | */ | |
947 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 948 | nilfs_cleanup_super(sbi); |
783f6184 RK |
949 | up_write(&nilfs->ns_sem); |
950 | } else { | |
c5ca48aa | 951 | __u64 features; |
e912a5b6 | 952 | struct nilfs_root *root; |
c5ca48aa | 953 | |
783f6184 RK |
954 | /* |
955 | * Mounting a RDONLY partition read-write, so reread and | |
956 | * store the current valid flag. (It may have been changed | |
957 | * by fsck since we originally mounted the partition.) | |
958 | */ | |
c5ca48aa RK |
959 | down_read(&nilfs->ns_sem); |
960 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & | |
961 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
962 | up_read(&nilfs->ns_sem); | |
963 | if (features) { | |
964 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
965 | "remount RDWR because of unsupported optional " | |
966 | "features (%llx)\n", | |
967 | sb->s_id, (unsigned long long)features); | |
968 | err = -EROFS; | |
969 | goto restore_opts; | |
970 | } | |
971 | ||
783f6184 | 972 | sb->s_flags &= ~MS_RDONLY; |
783f6184 | 973 | |
e912a5b6 RK |
974 | root = NILFS_I(sb->s_root->d_inode)->i_root; |
975 | err = nilfs_attach_segment_constructor(sbi, root); | |
783f6184 | 976 | if (err) |
e59399d0 | 977 | goto restore_opts; |
783f6184 RK |
978 | |
979 | down_write(&nilfs->ns_sem); | |
980 | nilfs_setup_super(sbi); | |
981 | up_write(&nilfs->ns_sem); | |
783f6184 RK |
982 | } |
983 | out: | |
e59399d0 | 984 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
985 | return 0; |
986 | ||
783f6184 RK |
987 | restore_opts: |
988 | sb->s_flags = old_sb_flags; | |
989 | sbi->s_mount_opt = old_opts.mount_opt; | |
990 | sbi->s_snapshot_cno = old_opts.snapshot_cno; | |
e59399d0 | 991 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
992 | return err; |
993 | } | |
994 | ||
995 | struct nilfs_super_data { | |
996 | struct block_device *bdev; | |
6dd47406 | 997 | struct nilfs_sb_info *sbi; |
783f6184 RK |
998 | __u64 cno; |
999 | int flags; | |
1000 | }; | |
1001 | ||
1002 | /** | |
1003 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
1004 | * @data: mount options | |
1005 | * @sd: nilfs_super_data | |
1006 | */ | |
1007 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
1008 | { | |
1009 | char *p, *options = data; | |
1010 | substring_t args[MAX_OPT_ARGS]; | |
1011 | int option, token; | |
1012 | int ret = 0; | |
1013 | ||
1014 | do { | |
1015 | p = strsep(&options, ","); | |
1016 | if (p != NULL && *p) { | |
1017 | token = match_token(p, tokens, args); | |
1018 | if (token == Opt_snapshot) { | |
1019 | if (!(sd->flags & MS_RDONLY)) | |
1020 | ret++; | |
1021 | else { | |
1022 | ret = match_int(&args[0], &option); | |
1023 | if (!ret) { | |
1024 | if (option > 0) | |
1025 | sd->cno = option; | |
1026 | else | |
1027 | ret++; | |
1028 | } | |
1029 | } | |
1030 | } | |
1031 | if (ret) | |
1032 | printk(KERN_ERR | |
1033 | "NILFS: invalid mount option: %s\n", p); | |
1034 | } | |
1035 | if (!options) | |
1036 | break; | |
1037 | BUG_ON(options == data); | |
1038 | *(options - 1) = ','; | |
1039 | } while (!ret); | |
1040 | return ret; | |
1041 | } | |
1042 | ||
1043 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1044 | { | |
1045 | struct nilfs_super_data *sd = data; | |
1046 | ||
1047 | s->s_bdev = sd->bdev; | |
1048 | s->s_dev = s->s_bdev->bd_dev; | |
1049 | return 0; | |
1050 | } | |
1051 | ||
1052 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 RK |
1053 | { |
1054 | struct nilfs_super_data *sd = data; | |
6dd47406 RK |
1055 | |
1056 | return sd->sbi && s->s_fs_info == (void *)sd->sbi; | |
783f6184 RK |
1057 | } |
1058 | ||
1059 | static int | |
1060 | nilfs_get_sb(struct file_system_type *fs_type, int flags, | |
1061 | const char *dev_name, void *data, struct vfsmount *mnt) | |
1062 | { | |
1063 | struct nilfs_super_data sd; | |
33c8e57c | 1064 | struct super_block *s; |
13e90559 | 1065 | fmode_t mode = FMODE_READ; |
33c8e57c | 1066 | struct the_nilfs *nilfs; |
783f6184 RK |
1067 | int err, need_to_close = 1; |
1068 | ||
13e90559 RK |
1069 | if (!(flags & MS_RDONLY)) |
1070 | mode |= FMODE_WRITE; | |
1071 | ||
1072 | sd.bdev = open_bdev_exclusive(dev_name, mode, fs_type); | |
d6d4c19c | 1073 | if (IS_ERR(sd.bdev)) |
783f6184 RK |
1074 | return PTR_ERR(sd.bdev); |
1075 | ||
1076 | /* | |
1077 | * To get mount instance using sget() vfs-routine, NILFS needs | |
1078 | * much more information than normal filesystems to identify mount | |
1079 | * instance. For snapshot mounts, not only a mount type (ro-mount | |
1080 | * or rw-mount) but also a checkpoint number is required. | |
783f6184 RK |
1081 | */ |
1082 | sd.cno = 0; | |
1083 | sd.flags = flags; | |
1084 | if (nilfs_identify((char *)data, &sd)) { | |
1085 | err = -EINVAL; | |
1086 | goto failed; | |
1087 | } | |
1088 | ||
33c8e57c RK |
1089 | nilfs = find_or_create_nilfs(sd.bdev); |
1090 | if (!nilfs) { | |
1091 | err = -ENOMEM; | |
1092 | goto failed; | |
1093 | } | |
1094 | ||
aa7dfb89 | 1095 | mutex_lock(&nilfs->ns_mount_mutex); |
3f82ff55 RK |
1096 | |
1097 | if (!sd.cno) { | |
1098 | /* | |
1099 | * Check if an exclusive mount exists or not. | |
1100 | * Snapshot mounts coexist with a current mount | |
1101 | * (i.e. rw-mount or ro-mount), whereas rw-mount and | |
1102 | * ro-mount are mutually exclusive. | |
1103 | */ | |
e59399d0 | 1104 | down_read(&nilfs->ns_super_sem); |
3f82ff55 RK |
1105 | if (nilfs->ns_current && |
1106 | ((nilfs->ns_current->s_super->s_flags ^ flags) | |
1107 | & MS_RDONLY)) { | |
e59399d0 | 1108 | up_read(&nilfs->ns_super_sem); |
3f82ff55 RK |
1109 | err = -EBUSY; |
1110 | goto failed_unlock; | |
1111 | } | |
e59399d0 | 1112 | up_read(&nilfs->ns_super_sem); |
783f6184 RK |
1113 | } |
1114 | ||
1115 | /* | |
6dd47406 | 1116 | * Find existing nilfs_sb_info struct |
783f6184 | 1117 | */ |
6dd47406 RK |
1118 | sd.sbi = nilfs_find_sbinfo(nilfs, !(flags & MS_RDONLY), sd.cno); |
1119 | ||
6dd47406 RK |
1120 | /* |
1121 | * Get super block instance holding the nilfs_sb_info struct. | |
1122 | * A new instance is allocated if no existing mount is present or | |
1123 | * existing instance has been unmounted. | |
1124 | */ | |
33c8e57c | 1125 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, &sd); |
6dd47406 RK |
1126 | if (sd.sbi) |
1127 | nilfs_put_sbinfo(sd.sbi); | |
1128 | ||
33c8e57c RK |
1129 | if (IS_ERR(s)) { |
1130 | err = PTR_ERR(s); | |
1131 | goto failed_unlock; | |
783f6184 RK |
1132 | } |
1133 | ||
1134 | if (!s->s_root) { | |
1135 | char b[BDEVNAME_SIZE]; | |
1136 | ||
33c8e57c | 1137 | /* New superblock instance created */ |
783f6184 | 1138 | s->s_flags = flags; |
4571b82c | 1139 | s->s_mode = mode; |
783f6184 RK |
1140 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); |
1141 | sb_set_blocksize(s, block_size(sd.bdev)); | |
1142 | ||
e2d1591a RK |
1143 | err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0, |
1144 | nilfs); | |
783f6184 RK |
1145 | if (err) |
1146 | goto cancel_new; | |
1147 | ||
1148 | s->s_flags |= MS_ACTIVE; | |
1149 | need_to_close = 0; | |
783f6184 RK |
1150 | } |
1151 | ||
aa7dfb89 | 1152 | mutex_unlock(&nilfs->ns_mount_mutex); |
783f6184 RK |
1153 | put_nilfs(nilfs); |
1154 | if (need_to_close) | |
13e90559 | 1155 | close_bdev_exclusive(sd.bdev, mode); |
783f6184 RK |
1156 | simple_set_mnt(mnt, s); |
1157 | return 0; | |
1158 | ||
783f6184 | 1159 | failed_unlock: |
aa7dfb89 | 1160 | mutex_unlock(&nilfs->ns_mount_mutex); |
33c8e57c | 1161 | put_nilfs(nilfs); |
783f6184 | 1162 | failed: |
13e90559 | 1163 | close_bdev_exclusive(sd.bdev, mode); |
783f6184 RK |
1164 | return err; |
1165 | ||
1166 | cancel_new: | |
1167 | /* Abandoning the newly allocated superblock */ | |
aa7dfb89 | 1168 | mutex_unlock(&nilfs->ns_mount_mutex); |
33c8e57c | 1169 | put_nilfs(nilfs); |
a95161aa | 1170 | deactivate_locked_super(s); |
783f6184 | 1171 | /* |
b87ca919 | 1172 | * deactivate_locked_super() invokes close_bdev_exclusive(). |
783f6184 | 1173 | * We must finish all post-cleaning before this call; |
aa7dfb89 | 1174 | * put_nilfs() needs the block device. |
783f6184 RK |
1175 | */ |
1176 | return err; | |
1177 | } | |
1178 | ||
783f6184 RK |
1179 | struct file_system_type nilfs_fs_type = { |
1180 | .owner = THIS_MODULE, | |
1181 | .name = "nilfs2", | |
1182 | .get_sb = nilfs_get_sb, | |
1183 | .kill_sb = kill_block_super, | |
1184 | .fs_flags = FS_REQUIRES_DEV, | |
1185 | }; | |
1186 | ||
41c88bd7 | 1187 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1188 | { |
41c88bd7 | 1189 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1190 | |
41c88bd7 LH |
1191 | INIT_LIST_HEAD(&ii->i_dirty); |
1192 | #ifdef CONFIG_NILFS_XATTR | |
1193 | init_rwsem(&ii->xattr_sem); | |
1194 | #endif | |
1195 | nilfs_btnode_cache_init_once(&ii->i_btnode_cache); | |
05d0e94b | 1196 | ii->i_bmap = &ii->i_bmap_data; |
41c88bd7 LH |
1197 | inode_init_once(&ii->vfs_inode); |
1198 | } | |
783f6184 | 1199 | |
41c88bd7 LH |
1200 | static void nilfs_segbuf_init_once(void *obj) |
1201 | { | |
1202 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1203 | } | |
783f6184 | 1204 | |
41c88bd7 LH |
1205 | static void nilfs_destroy_cachep(void) |
1206 | { | |
84cb0999 | 1207 | if (nilfs_inode_cachep) |
41c88bd7 | 1208 | kmem_cache_destroy(nilfs_inode_cachep); |
84cb0999 | 1209 | if (nilfs_transaction_cachep) |
41c88bd7 | 1210 | kmem_cache_destroy(nilfs_transaction_cachep); |
84cb0999 | 1211 | if (nilfs_segbuf_cachep) |
41c88bd7 | 1212 | kmem_cache_destroy(nilfs_segbuf_cachep); |
84cb0999 | 1213 | if (nilfs_btree_path_cache) |
41c88bd7 LH |
1214 | kmem_cache_destroy(nilfs_btree_path_cache); |
1215 | } | |
783f6184 | 1216 | |
41c88bd7 LH |
1217 | static int __init nilfs_init_cachep(void) |
1218 | { | |
1219 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1220 | sizeof(struct nilfs_inode_info), 0, | |
1221 | SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once); | |
1222 | if (!nilfs_inode_cachep) | |
1223 | goto fail; | |
1224 | ||
1225 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1226 | sizeof(struct nilfs_transaction_info), 0, | |
1227 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1228 | if (!nilfs_transaction_cachep) | |
1229 | goto fail; | |
1230 | ||
1231 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1232 | sizeof(struct nilfs_segment_buffer), 0, | |
1233 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1234 | if (!nilfs_segbuf_cachep) | |
1235 | goto fail; | |
1236 | ||
1237 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1238 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1239 | 0, 0, NULL); | |
1240 | if (!nilfs_btree_path_cache) | |
1241 | goto fail; | |
783f6184 RK |
1242 | |
1243 | return 0; | |
1244 | ||
41c88bd7 LH |
1245 | fail: |
1246 | nilfs_destroy_cachep(); | |
1247 | return -ENOMEM; | |
1248 | } | |
1249 | ||
1250 | static int __init init_nilfs_fs(void) | |
1251 | { | |
1252 | int err; | |
783f6184 | 1253 | |
41c88bd7 LH |
1254 | err = nilfs_init_cachep(); |
1255 | if (err) | |
1256 | goto fail; | |
783f6184 | 1257 | |
41c88bd7 LH |
1258 | err = register_filesystem(&nilfs_fs_type); |
1259 | if (err) | |
1260 | goto free_cachep; | |
783f6184 | 1261 | |
9f130263 | 1262 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1263 | return 0; |
783f6184 | 1264 | |
41c88bd7 LH |
1265 | free_cachep: |
1266 | nilfs_destroy_cachep(); | |
1267 | fail: | |
783f6184 RK |
1268 | return err; |
1269 | } | |
1270 | ||
1271 | static void __exit exit_nilfs_fs(void) | |
1272 | { | |
41c88bd7 | 1273 | nilfs_destroy_cachep(); |
783f6184 RK |
1274 | unregister_filesystem(&nilfs_fs_type); |
1275 | } | |
1276 | ||
1277 | module_init(init_nilfs_fs) | |
1278 | module_exit(exit_nilfs_fs) |