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 | |
2879ed66 | 149 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
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; |
2879ed66 | 160 | nilfs_btnode_cache_init(&ii->i_btnode_cache, sb->s_bdi); |
783f6184 RK |
161 | return &ii->vfs_inode; |
162 | } | |
163 | ||
164 | void nilfs_destroy_inode(struct inode *inode) | |
165 | { | |
b91c9a97 RK |
166 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
167 | ||
168 | if (mdi) { | |
169 | kfree(mdi->mi_bgl); /* kfree(NULL) is safe */ | |
170 | kfree(mdi); | |
171 | } | |
783f6184 RK |
172 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
173 | } | |
174 | ||
b2ac86e1 | 175 | static int nilfs_sync_super(struct nilfs_sb_info *sbi, int flag) |
783f6184 RK |
176 | { |
177 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
178 | int err; | |
783f6184 | 179 | |
783f6184 | 180 | retry: |
e339ad31 | 181 | set_buffer_dirty(nilfs->ns_sbh[0]); |
87e99511 CH |
182 | |
183 | if (nilfs_test_opt(sbi, BARRIER)) { | |
184 | err = __sync_dirty_buffer(nilfs->ns_sbh[0], | |
185 | WRITE_SYNC | WRITE_BARRIER); | |
186 | if (err == -EOPNOTSUPP) { | |
187 | nilfs_warning(sbi->s_super, __func__, | |
188 | "barrier-based sync failed. " | |
189 | "disabling barriers\n"); | |
190 | nilfs_clear_opt(sbi, BARRIER); | |
191 | goto retry; | |
192 | } | |
193 | } else { | |
194 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); | |
783f6184 | 195 | } |
87e99511 | 196 | |
e339ad31 | 197 | if (unlikely(err)) { |
783f6184 RK |
198 | printk(KERN_ERR |
199 | "NILFS: unable to write superblock (err=%d)\n", err); | |
e339ad31 | 200 | if (err == -EIO && nilfs->ns_sbh[1]) { |
b2ac86e1 JS |
201 | /* |
202 | * sbp[0] points to newer log than sbp[1], | |
203 | * so copy sbp[0] to sbp[1] to take over sbp[0]. | |
204 | */ | |
205 | memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0], | |
206 | nilfs->ns_sbsize); | |
e339ad31 RK |
207 | nilfs_fall_back_super_block(nilfs); |
208 | goto retry; | |
209 | } | |
210 | } else { | |
211 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; | |
212 | ||
b2ac86e1 JS |
213 | nilfs->ns_sbwcount++; |
214 | ||
e339ad31 RK |
215 | /* |
216 | * The latest segment becomes trailable from the position | |
217 | * written in superblock. | |
218 | */ | |
783f6184 | 219 | clear_nilfs_discontinued(nilfs); |
e339ad31 RK |
220 | |
221 | /* update GC protection for recent segments */ | |
222 | if (nilfs->ns_sbh[1]) { | |
b2ac86e1 | 223 | if (flag == NILFS_SB_COMMIT_ALL) { |
e339ad31 | 224 | set_buffer_dirty(nilfs->ns_sbh[1]); |
b2ac86e1 JS |
225 | if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0) |
226 | goto out; | |
e339ad31 | 227 | } |
b2ac86e1 JS |
228 | if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) < |
229 | le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno)) | |
230 | sbp = nilfs->ns_sbp[1]; | |
e339ad31 | 231 | } |
783f6184 | 232 | |
b2ac86e1 JS |
233 | spin_lock(&nilfs->ns_last_segment_lock); |
234 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); | |
235 | spin_unlock(&nilfs->ns_last_segment_lock); | |
236 | } | |
237 | out: | |
783f6184 RK |
238 | return err; |
239 | } | |
240 | ||
60f46b7e RK |
241 | void nilfs_set_log_cursor(struct nilfs_super_block *sbp, |
242 | struct the_nilfs *nilfs) | |
243 | { | |
244 | sector_t nfreeblocks; | |
245 | ||
246 | /* nilfs->ns_sem must be locked by the caller. */ | |
247 | nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
248 | sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
249 | ||
250 | spin_lock(&nilfs->ns_last_segment_lock); | |
251 | sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
252 | sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
253 | sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
254 | spin_unlock(&nilfs->ns_last_segment_lock); | |
255 | } | |
256 | ||
b2ac86e1 JS |
257 | struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *sbi, |
258 | int flip) | |
783f6184 RK |
259 | { |
260 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
e339ad31 | 261 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 262 | |
d26493b6 | 263 | /* nilfs->ns_sem must be locked by the caller. */ |
34cb9b5c | 264 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
d26493b6 JS |
265 | if (sbp[1] && |
266 | sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
b2ac86e1 | 267 | memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); |
d26493b6 | 268 | } else { |
e339ad31 RK |
269 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", |
270 | sbi->s_super->s_id); | |
d26493b6 | 271 | return NULL; |
e339ad31 | 272 | } |
b2ac86e1 JS |
273 | } else if (sbp[1] && |
274 | sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
275 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
e339ad31 | 276 | } |
b2ac86e1 JS |
277 | |
278 | if (flip && sbp[1]) | |
279 | nilfs_swap_super_block(nilfs); | |
280 | ||
d26493b6 JS |
281 | return sbp; |
282 | } | |
283 | ||
b2ac86e1 | 284 | int nilfs_commit_super(struct nilfs_sb_info *sbi, int flag) |
d26493b6 JS |
285 | { |
286 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
287 | struct nilfs_super_block **sbp = nilfs->ns_sbp; | |
288 | time_t t; | |
289 | ||
290 | /* nilfs->ns_sem must be locked by the caller. */ | |
e339ad31 | 291 | t = get_seconds(); |
b2ac86e1 | 292 | nilfs->ns_sbwtime = t; |
e339ad31 RK |
293 | sbp[0]->s_wtime = cpu_to_le64(t); |
294 | sbp[0]->s_sum = 0; | |
295 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
296 | (unsigned char *)sbp[0], | |
297 | nilfs->ns_sbsize)); | |
b2ac86e1 JS |
298 | if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) { |
299 | sbp[1]->s_wtime = sbp[0]->s_wtime; | |
300 | sbp[1]->s_sum = 0; | |
301 | sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
302 | (unsigned char *)sbp[1], | |
303 | nilfs->ns_sbsize)); | |
e339ad31 | 304 | } |
e605f0a7 | 305 | clear_nilfs_sb_dirty(nilfs); |
b2ac86e1 | 306 | return nilfs_sync_super(sbi, flag); |
783f6184 RK |
307 | } |
308 | ||
7ecaa46c RK |
309 | /** |
310 | * nilfs_cleanup_super() - write filesystem state for cleanup | |
311 | * @sbi: nilfs_sb_info to be unmounted or degraded to read-only | |
312 | * | |
313 | * This function restores state flags in the on-disk super block. | |
314 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the | |
315 | * filesystem was not clean previously. | |
316 | */ | |
317 | int nilfs_cleanup_super(struct nilfs_sb_info *sbi) | |
318 | { | |
d26493b6 | 319 | struct nilfs_super_block **sbp; |
b2ac86e1 | 320 | int flag = NILFS_SB_COMMIT; |
d26493b6 | 321 | int ret = -EIO; |
7ecaa46c | 322 | |
b2ac86e1 | 323 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
324 | if (sbp) { |
325 | sbp[0]->s_state = cpu_to_le16(sbi->s_nilfs->ns_mount_state); | |
b2ac86e1 JS |
326 | nilfs_set_log_cursor(sbp[0], sbi->s_nilfs); |
327 | if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { | |
328 | /* | |
329 | * make the "clean" flag also to the opposite | |
330 | * super block if both super blocks point to | |
331 | * the same checkpoint. | |
332 | */ | |
333 | sbp[1]->s_state = sbp[0]->s_state; | |
334 | flag = NILFS_SB_COMMIT_ALL; | |
335 | } | |
336 | ret = nilfs_commit_super(sbi, flag); | |
d26493b6 | 337 | } |
7ecaa46c RK |
338 | return ret; |
339 | } | |
340 | ||
783f6184 RK |
341 | static void nilfs_put_super(struct super_block *sb) |
342 | { | |
343 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
344 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
345 | ||
346 | nilfs_detach_segment_constructor(sbi); | |
347 | ||
348 | if (!(sb->s_flags & MS_RDONLY)) { | |
349 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 350 | nilfs_cleanup_super(sbi); |
783f6184 RK |
351 | up_write(&nilfs->ns_sem); |
352 | } | |
353 | ||
f1e89c86 RK |
354 | iput(nilfs->ns_sufile); |
355 | iput(nilfs->ns_cpfile); | |
356 | iput(nilfs->ns_dat); | |
357 | ||
348fe8da | 358 | destroy_nilfs(nilfs); |
783f6184 RK |
359 | sbi->s_super = NULL; |
360 | sb->s_fs_info = NULL; | |
f11459ad | 361 | kfree(sbi); |
783f6184 RK |
362 | } |
363 | ||
783f6184 RK |
364 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
365 | { | |
6233caa9 JS |
366 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
367 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 | 368 | struct nilfs_super_block **sbp; |
783f6184 RK |
369 | int err = 0; |
370 | ||
371 | /* This function is called when super block should be written back */ | |
372 | if (wait) | |
373 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
374 | |
375 | down_write(&nilfs->ns_sem); | |
d26493b6 | 376 | if (nilfs_sb_dirty(nilfs)) { |
b2ac86e1 JS |
377 | sbp = nilfs_prepare_super(sbi, nilfs_sb_will_flip(nilfs)); |
378 | if (likely(sbp)) { | |
379 | nilfs_set_log_cursor(sbp[0], nilfs); | |
380 | nilfs_commit_super(sbi, NILFS_SB_COMMIT); | |
381 | } | |
d26493b6 | 382 | } |
6233caa9 JS |
383 | up_write(&nilfs->ns_sem); |
384 | ||
783f6184 RK |
385 | return err; |
386 | } | |
387 | ||
4d8d9293 RK |
388 | int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno, int curr_mnt, |
389 | struct nilfs_root **rootp) | |
783f6184 RK |
390 | { |
391 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
4d8d9293 | 392 | struct nilfs_root *root; |
783f6184 RK |
393 | struct nilfs_checkpoint *raw_cp; |
394 | struct buffer_head *bh_cp; | |
4d8d9293 RK |
395 | int err = -ENOMEM; |
396 | ||
397 | root = nilfs_find_or_create_root( | |
398 | nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); | |
399 | if (!root) | |
400 | return err; | |
783f6184 | 401 | |
e912a5b6 RK |
402 | if (root->ifile) |
403 | goto reuse; /* already attached checkpoint */ | |
783f6184 | 404 | |
1154ecbd | 405 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
406 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
407 | &bh_cp); | |
1154ecbd | 408 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
409 | if (unlikely(err)) { |
410 | if (err == -ENOENT || err == -EINVAL) { | |
411 | printk(KERN_ERR | |
412 | "NILFS: Invalid checkpoint " | |
413 | "(checkpoint number=%llu)\n", | |
414 | (unsigned long long)cno); | |
415 | err = -EINVAL; | |
416 | } | |
417 | goto failed; | |
418 | } | |
f1e89c86 RK |
419 | |
420 | err = nilfs_ifile_read(sbi->s_super, root, nilfs->ns_inode_size, | |
421 | &raw_cp->cp_ifile_inode, &root->ifile); | |
422 | if (err) | |
783f6184 | 423 | goto failed_bh; |
b7c06342 RK |
424 | |
425 | atomic_set(&root->inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); | |
426 | atomic_set(&root->blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); | |
783f6184 RK |
427 | |
428 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
4d8d9293 | 429 | |
e912a5b6 | 430 | reuse: |
4d8d9293 | 431 | *rootp = root; |
783f6184 RK |
432 | return 0; |
433 | ||
434 | failed_bh: | |
435 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
436 | failed: | |
4d8d9293 | 437 | nilfs_put_root(root); |
783f6184 RK |
438 | |
439 | return err; | |
440 | } | |
441 | ||
783f6184 RK |
442 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
443 | { | |
444 | struct super_block *sb = dentry->d_sb; | |
b7c06342 RK |
445 | struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root; |
446 | struct the_nilfs *nilfs = root->nilfs; | |
c306af23 | 447 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
783f6184 RK |
448 | unsigned long long blocks; |
449 | unsigned long overhead; | |
450 | unsigned long nrsvblocks; | |
451 | sector_t nfreeblocks; | |
783f6184 RK |
452 | int err; |
453 | ||
454 | /* | |
455 | * Compute all of the segment blocks | |
456 | * | |
457 | * The blocks before first segment and after last segment | |
458 | * are excluded. | |
459 | */ | |
460 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
461 | - nilfs->ns_first_data_block; | |
462 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
463 | ||
464 | /* | |
465 | * Compute the overhead | |
466 | * | |
7a65004b | 467 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
468 | * We must count them as the overhead. |
469 | */ | |
470 | overhead = 0; | |
471 | ||
472 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
473 | if (unlikely(err)) | |
474 | return err; | |
475 | ||
476 | buf->f_type = NILFS_SUPER_MAGIC; | |
477 | buf->f_bsize = sb->s_blocksize; | |
478 | buf->f_blocks = blocks - overhead; | |
479 | buf->f_bfree = nfreeblocks; | |
480 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
481 | (buf->f_bfree - nrsvblocks) : 0; | |
b7c06342 | 482 | buf->f_files = atomic_read(&root->inodes_count); |
783f6184 RK |
483 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ |
484 | buf->f_namelen = NILFS_NAME_LEN; | |
c306af23 RK |
485 | buf->f_fsid.val[0] = (u32)id; |
486 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
487 | ||
783f6184 RK |
488 | return 0; |
489 | } | |
490 | ||
b58a285b JS |
491 | static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
492 | { | |
493 | struct super_block *sb = vfs->mnt_sb; | |
494 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
f11459ad | 495 | struct nilfs_root *root = NILFS_I(vfs->mnt_root->d_inode)->i_root; |
b58a285b JS |
496 | |
497 | if (!nilfs_test_opt(sbi, BARRIER)) | |
c6b4d57d | 498 | seq_puts(seq, ",nobarrier"); |
f11459ad RK |
499 | if (root->cno != NILFS_CPTREE_CURRENT_CNO) |
500 | seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno); | |
b58a285b | 501 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) |
c6b4d57d | 502 | seq_puts(seq, ",errors=panic"); |
277a6a34 | 503 | if (nilfs_test_opt(sbi, ERRORS_CONT)) |
c6b4d57d | 504 | seq_puts(seq, ",errors=continue"); |
b58a285b | 505 | if (nilfs_test_opt(sbi, STRICT_ORDER)) |
c6b4d57d | 506 | seq_puts(seq, ",order=strict"); |
0234576d | 507 | if (nilfs_test_opt(sbi, NORECOVERY)) |
c6b4d57d | 508 | seq_puts(seq, ",norecovery"); |
e902ec99 | 509 | if (nilfs_test_opt(sbi, DISCARD)) |
c6b4d57d | 510 | seq_puts(seq, ",discard"); |
b58a285b JS |
511 | |
512 | return 0; | |
513 | } | |
514 | ||
b87221de | 515 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
516 | .alloc_inode = nilfs_alloc_inode, |
517 | .destroy_inode = nilfs_destroy_inode, | |
518 | .dirty_inode = nilfs_dirty_inode, | |
519 | /* .write_inode = nilfs_write_inode, */ | |
520 | /* .put_inode = nilfs_put_inode, */ | |
521 | /* .drop_inode = nilfs_drop_inode, */ | |
6fd1e5c9 | 522 | .evict_inode = nilfs_evict_inode, |
783f6184 | 523 | .put_super = nilfs_put_super, |
1dfa2710 | 524 | /* .write_super = nilfs_write_super, */ |
783f6184 RK |
525 | .sync_fs = nilfs_sync_fs, |
526 | /* .write_super_lockfs */ | |
527 | /* .unlockfs */ | |
528 | .statfs = nilfs_statfs, | |
529 | .remount_fs = nilfs_remount, | |
783f6184 | 530 | /* .umount_begin */ |
b58a285b | 531 | .show_options = nilfs_show_options |
783f6184 RK |
532 | }; |
533 | ||
783f6184 RK |
534 | enum { |
535 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
773bc4f3 | 536 | Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
802d3177 | 537 | Opt_discard, Opt_nodiscard, Opt_err, |
783f6184 RK |
538 | }; |
539 | ||
540 | static match_table_t tokens = { | |
541 | {Opt_err_cont, "errors=continue"}, | |
542 | {Opt_err_panic, "errors=panic"}, | |
543 | {Opt_err_ro, "errors=remount-ro"}, | |
773bc4f3 | 544 | {Opt_barrier, "barrier"}, |
91f1953b | 545 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
546 | {Opt_snapshot, "cp=%u"}, |
547 | {Opt_order, "order=%s"}, | |
0234576d | 548 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 549 | {Opt_discard, "discard"}, |
802d3177 | 550 | {Opt_nodiscard, "nodiscard"}, |
783f6184 RK |
551 | {Opt_err, NULL} |
552 | }; | |
553 | ||
7c017457 | 554 | static int parse_options(char *options, struct super_block *sb, int is_remount) |
783f6184 RK |
555 | { |
556 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
557 | char *p; | |
558 | substring_t args[MAX_OPT_ARGS]; | |
783f6184 RK |
559 | |
560 | if (!options) | |
561 | return 1; | |
562 | ||
563 | while ((p = strsep(&options, ",")) != NULL) { | |
564 | int token; | |
565 | if (!*p) | |
566 | continue; | |
567 | ||
568 | token = match_token(p, tokens, args); | |
569 | switch (token) { | |
773bc4f3 RK |
570 | case Opt_barrier: |
571 | nilfs_set_opt(sbi, BARRIER); | |
572 | break; | |
91f1953b JS |
573 | case Opt_nobarrier: |
574 | nilfs_clear_opt(sbi, BARRIER); | |
783f6184 RK |
575 | break; |
576 | case Opt_order: | |
577 | if (strcmp(args[0].from, "relaxed") == 0) | |
578 | /* Ordered data semantics */ | |
579 | nilfs_clear_opt(sbi, STRICT_ORDER); | |
580 | else if (strcmp(args[0].from, "strict") == 0) | |
581 | /* Strict in-order semantics */ | |
582 | nilfs_set_opt(sbi, STRICT_ORDER); | |
583 | else | |
584 | return 0; | |
585 | break; | |
586 | case Opt_err_panic: | |
587 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC); | |
588 | break; | |
589 | case Opt_err_ro: | |
590 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO); | |
591 | break; | |
592 | case Opt_err_cont: | |
593 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT); | |
594 | break; | |
595 | case Opt_snapshot: | |
7c017457 | 596 | if (is_remount) { |
f11459ad RK |
597 | printk(KERN_ERR |
598 | "NILFS: \"%s\" option is invalid " | |
599 | "for remount.\n", p); | |
783f6184 | 600 | return 0; |
7c017457 | 601 | } |
783f6184 | 602 | break; |
0234576d RK |
603 | case Opt_norecovery: |
604 | nilfs_set_opt(sbi, NORECOVERY); | |
605 | break; | |
e902ec99 JS |
606 | case Opt_discard: |
607 | nilfs_set_opt(sbi, DISCARD); | |
608 | break; | |
802d3177 RK |
609 | case Opt_nodiscard: |
610 | nilfs_clear_opt(sbi, DISCARD); | |
611 | break; | |
783f6184 RK |
612 | default: |
613 | printk(KERN_ERR | |
614 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
615 | return 0; | |
616 | } | |
617 | } | |
618 | return 1; | |
619 | } | |
620 | ||
621 | static inline void | |
622 | nilfs_set_default_options(struct nilfs_sb_info *sbi, | |
623 | struct nilfs_super_block *sbp) | |
624 | { | |
625 | sbi->s_mount_opt = | |
277a6a34 | 626 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
627 | } |
628 | ||
629 | static int nilfs_setup_super(struct nilfs_sb_info *sbi) | |
630 | { | |
631 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 JS |
632 | struct nilfs_super_block **sbp; |
633 | int max_mnt_count; | |
634 | int mnt_count; | |
635 | ||
636 | /* nilfs->ns_sem must be locked by the caller. */ | |
b2ac86e1 | 637 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
638 | if (!sbp) |
639 | return -EIO; | |
640 | ||
641 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); | |
642 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); | |
783f6184 | 643 | |
f50a4c81 | 644 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
783f6184 RK |
645 | printk(KERN_WARNING |
646 | "NILFS warning: mounting fs with errors\n"); | |
647 | #if 0 | |
648 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
649 | printk(KERN_WARNING | |
650 | "NILFS warning: maximal mount count reached\n"); | |
651 | #endif | |
652 | } | |
653 | if (!max_mnt_count) | |
d26493b6 | 654 | sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
783f6184 | 655 | |
d26493b6 JS |
656 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
657 | sbp[0]->s_state = | |
658 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); | |
659 | sbp[0]->s_mtime = cpu_to_le64(get_seconds()); | |
b2ac86e1 JS |
660 | /* synchronize sbp[1] with sbp[0] */ |
661 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
662 | return nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL); | |
783f6184 RK |
663 | } |
664 | ||
e339ad31 RK |
665 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
666 | u64 pos, int blocksize, | |
667 | struct buffer_head **pbh) | |
783f6184 | 668 | { |
e339ad31 RK |
669 | unsigned long long sb_index = pos; |
670 | unsigned long offset; | |
783f6184 | 671 | |
e339ad31 | 672 | offset = do_div(sb_index, blocksize); |
783f6184 | 673 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 674 | if (!*pbh) |
783f6184 | 675 | return NULL; |
783f6184 RK |
676 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
677 | } | |
678 | ||
783f6184 RK |
679 | int nilfs_store_magic_and_option(struct super_block *sb, |
680 | struct nilfs_super_block *sbp, | |
681 | char *data) | |
682 | { | |
683 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
684 | ||
783f6184 RK |
685 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
686 | ||
687 | /* FS independent flags */ | |
688 | #ifdef NILFS_ATIME_DISABLE | |
689 | sb->s_flags |= MS_NOATIME; | |
690 | #endif | |
691 | ||
783f6184 RK |
692 | nilfs_set_default_options(sbi, sbp); |
693 | ||
694 | sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid); | |
695 | sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid); | |
696 | sbi->s_interval = le32_to_cpu(sbp->s_c_interval); | |
697 | sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max); | |
698 | ||
7c017457 | 699 | return !parse_options(data, sb, 0) ? -EINVAL : 0 ; |
783f6184 RK |
700 | } |
701 | ||
c5ca48aa RK |
702 | int nilfs_check_feature_compatibility(struct super_block *sb, |
703 | struct nilfs_super_block *sbp) | |
704 | { | |
705 | __u64 features; | |
706 | ||
707 | features = le64_to_cpu(sbp->s_feature_incompat) & | |
708 | ~NILFS_FEATURE_INCOMPAT_SUPP; | |
709 | if (features) { | |
710 | printk(KERN_ERR "NILFS: couldn't mount because of unsupported " | |
711 | "optional features (%llx)\n", | |
712 | (unsigned long long)features); | |
713 | return -EINVAL; | |
714 | } | |
715 | features = le64_to_cpu(sbp->s_feature_compat_ro) & | |
716 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
717 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
718 | printk(KERN_ERR "NILFS: couldn't mount RDWR because of " | |
719 | "unsupported optional features (%llx)\n", | |
720 | (unsigned long long)features); | |
721 | return -EINVAL; | |
722 | } | |
723 | return 0; | |
724 | } | |
725 | ||
367ea334 RK |
726 | static int nilfs_get_root_dentry(struct super_block *sb, |
727 | struct nilfs_root *root, | |
728 | struct dentry **root_dentry) | |
729 | { | |
730 | struct inode *inode; | |
731 | struct dentry *dentry; | |
732 | int ret = 0; | |
733 | ||
734 | inode = nilfs_iget(sb, root, NILFS_ROOT_INO); | |
735 | if (IS_ERR(inode)) { | |
736 | printk(KERN_ERR "NILFS: get root inode failed\n"); | |
737 | ret = PTR_ERR(inode); | |
738 | goto out; | |
739 | } | |
740 | if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { | |
741 | iput(inode); | |
742 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); | |
743 | ret = -EINVAL; | |
744 | goto out; | |
745 | } | |
746 | ||
f11459ad RK |
747 | if (root->cno == NILFS_CPTREE_CURRENT_CNO) { |
748 | dentry = d_find_alias(inode); | |
749 | if (!dentry) { | |
750 | dentry = d_alloc_root(inode); | |
751 | if (!dentry) { | |
752 | iput(inode); | |
753 | ret = -ENOMEM; | |
754 | goto failed_dentry; | |
755 | } | |
756 | } else { | |
757 | iput(inode); | |
758 | } | |
759 | } else { | |
760 | dentry = d_obtain_alias(inode); | |
761 | if (IS_ERR(dentry)) { | |
762 | ret = PTR_ERR(dentry); | |
763 | goto failed_dentry; | |
764 | } | |
367ea334 RK |
765 | } |
766 | *root_dentry = dentry; | |
767 | out: | |
768 | return ret; | |
f11459ad RK |
769 | |
770 | failed_dentry: | |
771 | printk(KERN_ERR "NILFS: get root dentry failed\n"); | |
772 | goto out; | |
367ea334 RK |
773 | } |
774 | ||
ab4d8f7e RK |
775 | static int nilfs_attach_snapshot(struct super_block *s, __u64 cno, |
776 | struct dentry **root_dentry) | |
777 | { | |
778 | struct the_nilfs *nilfs = NILFS_SB(s)->s_nilfs; | |
779 | struct nilfs_root *root; | |
780 | int ret; | |
781 | ||
782 | down_read(&nilfs->ns_segctor_sem); | |
783 | ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno); | |
784 | up_read(&nilfs->ns_segctor_sem); | |
785 | if (ret < 0) { | |
786 | ret = (ret == -ENOENT) ? -EINVAL : ret; | |
787 | goto out; | |
788 | } else if (!ret) { | |
789 | printk(KERN_ERR "NILFS: The specified checkpoint is " | |
790 | "not a snapshot (checkpoint number=%llu).\n", | |
791 | (unsigned long long)cno); | |
792 | ret = -EINVAL; | |
793 | goto out; | |
794 | } | |
795 | ||
796 | ret = nilfs_attach_checkpoint(NILFS_SB(s), cno, false, &root); | |
797 | if (ret) { | |
798 | printk(KERN_ERR "NILFS: error loading snapshot " | |
799 | "(checkpoint number=%llu).\n", | |
800 | (unsigned long long)cno); | |
801 | goto out; | |
802 | } | |
803 | ret = nilfs_get_root_dentry(s, root, root_dentry); | |
804 | nilfs_put_root(root); | |
805 | out: | |
806 | return ret; | |
807 | } | |
808 | ||
f11459ad RK |
809 | static int nilfs_tree_was_touched(struct dentry *root_dentry) |
810 | { | |
811 | return atomic_read(&root_dentry->d_count) > 1; | |
812 | } | |
813 | ||
814 | /** | |
815 | * nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint | |
816 | * @root_dentry: root dentry of the tree to be shrunk | |
817 | * | |
818 | * This function returns true if the tree was in-use. | |
819 | */ | |
820 | static int nilfs_try_to_shrink_tree(struct dentry *root_dentry) | |
821 | { | |
822 | if (have_submounts(root_dentry)) | |
823 | return true; | |
824 | shrink_dcache_parent(root_dentry); | |
825 | return nilfs_tree_was_touched(root_dentry); | |
826 | } | |
827 | ||
032dbb3b RK |
828 | int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno) |
829 | { | |
830 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; | |
831 | struct nilfs_root *root; | |
832 | struct inode *inode; | |
833 | struct dentry *dentry; | |
834 | int ret; | |
835 | ||
836 | if (cno < 0 || cno > nilfs->ns_cno) | |
837 | return false; | |
838 | ||
839 | if (cno >= nilfs_last_cno(nilfs)) | |
840 | return true; /* protect recent checkpoints */ | |
841 | ||
842 | ret = false; | |
843 | root = nilfs_lookup_root(NILFS_SB(sb)->s_nilfs, cno); | |
844 | if (root) { | |
845 | inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO); | |
846 | if (inode) { | |
847 | dentry = d_find_alias(inode); | |
848 | if (dentry) { | |
849 | if (nilfs_tree_was_touched(dentry)) | |
850 | ret = nilfs_try_to_shrink_tree(dentry); | |
851 | dput(dentry); | |
852 | } | |
853 | iput(inode); | |
854 | } | |
855 | nilfs_put_root(root); | |
856 | } | |
857 | return ret; | |
858 | } | |
859 | ||
783f6184 RK |
860 | /** |
861 | * nilfs_fill_super() - initialize a super block instance | |
862 | * @sb: super_block | |
863 | * @data: mount options | |
864 | * @silent: silent mode flag | |
783f6184 | 865 | * |
aa7dfb89 | 866 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
867 | * So, the recovery process is protected from other simultaneous mounts. |
868 | */ | |
869 | static int | |
348fe8da | 870 | nilfs_fill_super(struct super_block *sb, void *data, int silent) |
783f6184 | 871 | { |
348fe8da | 872 | struct the_nilfs *nilfs; |
783f6184 | 873 | struct nilfs_sb_info *sbi; |
4d8d9293 | 874 | struct nilfs_root *fsroot; |
783f6184 | 875 | __u64 cno; |
ab4d8f7e | 876 | int err; |
783f6184 RK |
877 | |
878 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
879 | if (!sbi) | |
880 | return -ENOMEM; | |
881 | ||
882 | sb->s_fs_info = sbi; | |
348fe8da | 883 | sbi->s_super = sb; |
783f6184 | 884 | |
348fe8da RK |
885 | nilfs = alloc_nilfs(sb->s_bdev); |
886 | if (!nilfs) { | |
887 | err = -ENOMEM; | |
888 | goto failed_sbi; | |
889 | } | |
783f6184 | 890 | sbi->s_nilfs = nilfs; |
783f6184 RK |
891 | |
892 | err = init_nilfs(nilfs, sbi, (char *)data); | |
893 | if (err) | |
348fe8da | 894 | goto failed_nilfs; |
783f6184 RK |
895 | |
896 | spin_lock_init(&sbi->s_inode_lock); | |
897 | INIT_LIST_HEAD(&sbi->s_dirty_files); | |
783f6184 RK |
898 | |
899 | /* | |
900 | * Following initialization is overlapped because | |
901 | * nilfs_sb_info structure has been cleared at the beginning. | |
902 | * But we reserve them to keep our interest and make ready | |
903 | * for the future change. | |
904 | */ | |
905 | get_random_bytes(&sbi->s_next_generation, | |
906 | sizeof(sbi->s_next_generation)); | |
907 | spin_lock_init(&sbi->s_next_gen_lock); | |
908 | ||
909 | sb->s_op = &nilfs_sops; | |
910 | sb->s_export_op = &nilfs_export_ops; | |
911 | sb->s_root = NULL; | |
61239230 | 912 | sb->s_time_gran = 1; |
973bec34 | 913 | sb->s_bdi = nilfs->ns_bdi; |
783f6184 | 914 | |
f50a4c81 RK |
915 | err = load_nilfs(nilfs, sbi); |
916 | if (err) | |
348fe8da | 917 | goto failed_nilfs; |
f50a4c81 | 918 | |
ab4d8f7e RK |
919 | cno = nilfs_last_cno(nilfs); |
920 | err = nilfs_attach_checkpoint(sbi, cno, true, &fsroot); | |
783f6184 | 921 | if (err) { |
f11459ad RK |
922 | printk(KERN_ERR "NILFS: error loading last checkpoint " |
923 | "(checkpoint number=%llu).\n", (unsigned long long)cno); | |
f1e89c86 | 924 | goto failed_unload; |
783f6184 RK |
925 | } |
926 | ||
927 | if (!(sb->s_flags & MS_RDONLY)) { | |
e912a5b6 | 928 | err = nilfs_attach_segment_constructor(sbi, fsroot); |
783f6184 RK |
929 | if (err) |
930 | goto failed_checkpoint; | |
931 | } | |
932 | ||
367ea334 RK |
933 | err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root); |
934 | if (err) | |
783f6184 | 935 | goto failed_segctor; |
783f6184 | 936 | |
4d8d9293 RK |
937 | nilfs_put_root(fsroot); |
938 | ||
783f6184 RK |
939 | if (!(sb->s_flags & MS_RDONLY)) { |
940 | down_write(&nilfs->ns_sem); | |
941 | nilfs_setup_super(sbi); | |
942 | up_write(&nilfs->ns_sem); | |
943 | } | |
944 | ||
783f6184 RK |
945 | return 0; |
946 | ||
783f6184 RK |
947 | failed_segctor: |
948 | nilfs_detach_segment_constructor(sbi); | |
949 | ||
950 | failed_checkpoint: | |
4d8d9293 | 951 | nilfs_put_root(fsroot); |
783f6184 | 952 | |
f1e89c86 RK |
953 | failed_unload: |
954 | iput(nilfs->ns_sufile); | |
955 | iput(nilfs->ns_cpfile); | |
956 | iput(nilfs->ns_dat); | |
957 | ||
348fe8da RK |
958 | failed_nilfs: |
959 | destroy_nilfs(nilfs); | |
960 | ||
783f6184 | 961 | failed_sbi: |
783f6184 | 962 | sb->s_fs_info = NULL; |
f11459ad | 963 | kfree(sbi); |
783f6184 RK |
964 | return err; |
965 | } | |
966 | ||
967 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
968 | { | |
969 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
783f6184 RK |
970 | struct the_nilfs *nilfs = sbi->s_nilfs; |
971 | unsigned long old_sb_flags; | |
972 | struct nilfs_mount_options old_opts; | |
f11459ad | 973 | int err; |
783f6184 RK |
974 | |
975 | old_sb_flags = sb->s_flags; | |
976 | old_opts.mount_opt = sbi->s_mount_opt; | |
783f6184 | 977 | |
7c017457 | 978 | if (!parse_options(data, sb, 1)) { |
783f6184 RK |
979 | err = -EINVAL; |
980 | goto restore_opts; | |
981 | } | |
982 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); | |
983 | ||
d240e067 | 984 | err = -EINVAL; |
783f6184 | 985 | |
0234576d RK |
986 | if (!nilfs_valid_fs(nilfs)) { |
987 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
988 | "remount because the filesystem is in an " | |
989 | "incomplete recovery state.\n", sb->s_id); | |
0234576d RK |
990 | goto restore_opts; |
991 | } | |
992 | ||
783f6184 RK |
993 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
994 | goto out; | |
995 | if (*flags & MS_RDONLY) { | |
996 | /* Shutting down the segment constructor */ | |
997 | nilfs_detach_segment_constructor(sbi); | |
998 | sb->s_flags |= MS_RDONLY; | |
999 | ||
783f6184 RK |
1000 | /* |
1001 | * Remounting a valid RW partition RDONLY, so set | |
1002 | * the RDONLY flag and then mark the partition as valid again. | |
1003 | */ | |
1004 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 1005 | nilfs_cleanup_super(sbi); |
783f6184 RK |
1006 | up_write(&nilfs->ns_sem); |
1007 | } else { | |
c5ca48aa | 1008 | __u64 features; |
e912a5b6 | 1009 | struct nilfs_root *root; |
c5ca48aa | 1010 | |
783f6184 RK |
1011 | /* |
1012 | * Mounting a RDONLY partition read-write, so reread and | |
1013 | * store the current valid flag. (It may have been changed | |
1014 | * by fsck since we originally mounted the partition.) | |
1015 | */ | |
c5ca48aa RK |
1016 | down_read(&nilfs->ns_sem); |
1017 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & | |
1018 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
1019 | up_read(&nilfs->ns_sem); | |
1020 | if (features) { | |
1021 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1022 | "remount RDWR because of unsupported optional " | |
1023 | "features (%llx)\n", | |
1024 | sb->s_id, (unsigned long long)features); | |
1025 | err = -EROFS; | |
1026 | goto restore_opts; | |
1027 | } | |
1028 | ||
783f6184 | 1029 | sb->s_flags &= ~MS_RDONLY; |
783f6184 | 1030 | |
e912a5b6 RK |
1031 | root = NILFS_I(sb->s_root->d_inode)->i_root; |
1032 | err = nilfs_attach_segment_constructor(sbi, root); | |
783f6184 | 1033 | if (err) |
e59399d0 | 1034 | goto restore_opts; |
783f6184 RK |
1035 | |
1036 | down_write(&nilfs->ns_sem); | |
1037 | nilfs_setup_super(sbi); | |
1038 | up_write(&nilfs->ns_sem); | |
783f6184 RK |
1039 | } |
1040 | out: | |
1041 | return 0; | |
1042 | ||
783f6184 RK |
1043 | restore_opts: |
1044 | sb->s_flags = old_sb_flags; | |
1045 | sbi->s_mount_opt = old_opts.mount_opt; | |
783f6184 RK |
1046 | return err; |
1047 | } | |
1048 | ||
1049 | struct nilfs_super_data { | |
1050 | struct block_device *bdev; | |
6dd47406 | 1051 | struct nilfs_sb_info *sbi; |
783f6184 RK |
1052 | __u64 cno; |
1053 | int flags; | |
1054 | }; | |
1055 | ||
1056 | /** | |
1057 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
1058 | * @data: mount options | |
1059 | * @sd: nilfs_super_data | |
1060 | */ | |
1061 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
1062 | { | |
1063 | char *p, *options = data; | |
1064 | substring_t args[MAX_OPT_ARGS]; | |
c05dbfc2 | 1065 | int token; |
783f6184 RK |
1066 | int ret = 0; |
1067 | ||
1068 | do { | |
1069 | p = strsep(&options, ","); | |
1070 | if (p != NULL && *p) { | |
1071 | token = match_token(p, tokens, args); | |
1072 | if (token == Opt_snapshot) { | |
c05dbfc2 | 1073 | if (!(sd->flags & MS_RDONLY)) { |
783f6184 | 1074 | ret++; |
c05dbfc2 RK |
1075 | } else { |
1076 | sd->cno = simple_strtoull(args[0].from, | |
1077 | NULL, 0); | |
1078 | /* | |
1079 | * No need to see the end pointer; | |
1080 | * match_token() has done syntax | |
1081 | * checking. | |
1082 | */ | |
1083 | if (sd->cno == 0) | |
1084 | ret++; | |
783f6184 RK |
1085 | } |
1086 | } | |
1087 | if (ret) | |
1088 | printk(KERN_ERR | |
1089 | "NILFS: invalid mount option: %s\n", p); | |
1090 | } | |
1091 | if (!options) | |
1092 | break; | |
1093 | BUG_ON(options == data); | |
1094 | *(options - 1) = ','; | |
1095 | } while (!ret); | |
1096 | return ret; | |
1097 | } | |
1098 | ||
1099 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1100 | { | |
f11459ad | 1101 | s->s_bdev = data; |
783f6184 RK |
1102 | s->s_dev = s->s_bdev->bd_dev; |
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 | 1107 | { |
f11459ad | 1108 | return (void *)s->s_bdev == data; |
783f6184 RK |
1109 | } |
1110 | ||
1111 | static int | |
1112 | nilfs_get_sb(struct file_system_type *fs_type, int flags, | |
1113 | const char *dev_name, void *data, struct vfsmount *mnt) | |
1114 | { | |
1115 | struct nilfs_super_data sd; | |
33c8e57c | 1116 | struct super_block *s; |
13e90559 | 1117 | fmode_t mode = FMODE_READ; |
f11459ad RK |
1118 | struct dentry *root_dentry; |
1119 | int err, s_new = false; | |
783f6184 | 1120 | |
13e90559 RK |
1121 | if (!(flags & MS_RDONLY)) |
1122 | mode |= FMODE_WRITE; | |
1123 | ||
1124 | sd.bdev = open_bdev_exclusive(dev_name, mode, fs_type); | |
d6d4c19c | 1125 | if (IS_ERR(sd.bdev)) |
783f6184 RK |
1126 | return PTR_ERR(sd.bdev); |
1127 | ||
783f6184 RK |
1128 | sd.cno = 0; |
1129 | sd.flags = flags; | |
1130 | if (nilfs_identify((char *)data, &sd)) { | |
1131 | err = -EINVAL; | |
1132 | goto failed; | |
1133 | } | |
1134 | ||
f11459ad | 1135 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev); |
33c8e57c RK |
1136 | if (IS_ERR(s)) { |
1137 | err = PTR_ERR(s); | |
348fe8da | 1138 | goto failed; |
783f6184 RK |
1139 | } |
1140 | ||
1141 | if (!s->s_root) { | |
1142 | char b[BDEVNAME_SIZE]; | |
1143 | ||
f11459ad RK |
1144 | s_new = true; |
1145 | ||
33c8e57c | 1146 | /* New superblock instance created */ |
783f6184 | 1147 | s->s_flags = flags; |
4571b82c | 1148 | s->s_mode = mode; |
783f6184 RK |
1149 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); |
1150 | sb_set_blocksize(s, block_size(sd.bdev)); | |
1151 | ||
348fe8da | 1152 | err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
783f6184 | 1153 | if (err) |
348fe8da | 1154 | goto failed_super; |
783f6184 RK |
1155 | |
1156 | s->s_flags |= MS_ACTIVE; | |
f11459ad RK |
1157 | } else if (!sd.cno) { |
1158 | int busy = false; | |
1159 | ||
1160 | if (nilfs_tree_was_touched(s->s_root)) { | |
1161 | busy = nilfs_try_to_shrink_tree(s->s_root); | |
1162 | if (busy && (flags ^ s->s_flags) & MS_RDONLY) { | |
1163 | printk(KERN_ERR "NILFS: the device already " | |
1164 | "has a %s mount.\n", | |
1165 | (s->s_flags & MS_RDONLY) ? | |
1166 | "read-only" : "read/write"); | |
1167 | err = -EBUSY; | |
1168 | goto failed_super; | |
1169 | } | |
1170 | } | |
1171 | if (!busy) { | |
1172 | /* | |
1173 | * Try remount to setup mount states if the current | |
1174 | * tree is not mounted and only snapshots use this sb. | |
1175 | */ | |
1176 | err = nilfs_remount(s, &flags, data); | |
1177 | if (err) | |
1178 | goto failed_super; | |
1179 | } | |
1180 | } | |
1181 | ||
1182 | if (sd.cno) { | |
1183 | err = nilfs_attach_snapshot(s, sd.cno, &root_dentry); | |
348fe8da | 1184 | if (err) |
f11459ad | 1185 | goto failed_super; |
f11459ad RK |
1186 | } else { |
1187 | root_dentry = dget(s->s_root); | |
783f6184 RK |
1188 | } |
1189 | ||
f11459ad | 1190 | if (!s_new) |
13e90559 | 1191 | close_bdev_exclusive(sd.bdev, mode); |
f11459ad RK |
1192 | |
1193 | mnt->mnt_sb = s; | |
1194 | mnt->mnt_root = root_dentry; | |
783f6184 RK |
1195 | return 0; |
1196 | ||
f11459ad RK |
1197 | failed_super: |
1198 | deactivate_locked_super(s); | |
783f6184 | 1199 | |
348fe8da RK |
1200 | failed: |
1201 | if (!s_new) | |
1202 | close_bdev_exclusive(sd.bdev, mode); | |
783f6184 RK |
1203 | return err; |
1204 | } | |
1205 | ||
783f6184 RK |
1206 | struct file_system_type nilfs_fs_type = { |
1207 | .owner = THIS_MODULE, | |
1208 | .name = "nilfs2", | |
1209 | .get_sb = nilfs_get_sb, | |
1210 | .kill_sb = kill_block_super, | |
1211 | .fs_flags = FS_REQUIRES_DEV, | |
1212 | }; | |
1213 | ||
41c88bd7 | 1214 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1215 | { |
41c88bd7 | 1216 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1217 | |
41c88bd7 LH |
1218 | INIT_LIST_HEAD(&ii->i_dirty); |
1219 | #ifdef CONFIG_NILFS_XATTR | |
1220 | init_rwsem(&ii->xattr_sem); | |
1221 | #endif | |
1222 | nilfs_btnode_cache_init_once(&ii->i_btnode_cache); | |
05d0e94b | 1223 | ii->i_bmap = &ii->i_bmap_data; |
41c88bd7 LH |
1224 | inode_init_once(&ii->vfs_inode); |
1225 | } | |
783f6184 | 1226 | |
41c88bd7 LH |
1227 | static void nilfs_segbuf_init_once(void *obj) |
1228 | { | |
1229 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1230 | } | |
783f6184 | 1231 | |
41c88bd7 LH |
1232 | static void nilfs_destroy_cachep(void) |
1233 | { | |
84cb0999 | 1234 | if (nilfs_inode_cachep) |
41c88bd7 | 1235 | kmem_cache_destroy(nilfs_inode_cachep); |
84cb0999 | 1236 | if (nilfs_transaction_cachep) |
41c88bd7 | 1237 | kmem_cache_destroy(nilfs_transaction_cachep); |
84cb0999 | 1238 | if (nilfs_segbuf_cachep) |
41c88bd7 | 1239 | kmem_cache_destroy(nilfs_segbuf_cachep); |
84cb0999 | 1240 | if (nilfs_btree_path_cache) |
41c88bd7 LH |
1241 | kmem_cache_destroy(nilfs_btree_path_cache); |
1242 | } | |
783f6184 | 1243 | |
41c88bd7 LH |
1244 | static int __init nilfs_init_cachep(void) |
1245 | { | |
1246 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1247 | sizeof(struct nilfs_inode_info), 0, | |
1248 | SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once); | |
1249 | if (!nilfs_inode_cachep) | |
1250 | goto fail; | |
1251 | ||
1252 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1253 | sizeof(struct nilfs_transaction_info), 0, | |
1254 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1255 | if (!nilfs_transaction_cachep) | |
1256 | goto fail; | |
1257 | ||
1258 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1259 | sizeof(struct nilfs_segment_buffer), 0, | |
1260 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1261 | if (!nilfs_segbuf_cachep) | |
1262 | goto fail; | |
1263 | ||
1264 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1265 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1266 | 0, 0, NULL); | |
1267 | if (!nilfs_btree_path_cache) | |
1268 | goto fail; | |
783f6184 RK |
1269 | |
1270 | return 0; | |
1271 | ||
41c88bd7 LH |
1272 | fail: |
1273 | nilfs_destroy_cachep(); | |
1274 | return -ENOMEM; | |
1275 | } | |
1276 | ||
1277 | static int __init init_nilfs_fs(void) | |
1278 | { | |
1279 | int err; | |
783f6184 | 1280 | |
41c88bd7 LH |
1281 | err = nilfs_init_cachep(); |
1282 | if (err) | |
1283 | goto fail; | |
783f6184 | 1284 | |
41c88bd7 LH |
1285 | err = register_filesystem(&nilfs_fs_type); |
1286 | if (err) | |
1287 | goto free_cachep; | |
783f6184 | 1288 | |
9f130263 | 1289 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1290 | return 0; |
783f6184 | 1291 | |
41c88bd7 LH |
1292 | free_cachep: |
1293 | nilfs_destroy_cachep(); | |
1294 | fail: | |
783f6184 RK |
1295 | return err; |
1296 | } | |
1297 | ||
1298 | static void __exit exit_nilfs_fs(void) | |
1299 | { | |
41c88bd7 | 1300 | nilfs_destroy_cachep(); |
783f6184 RK |
1301 | unregister_filesystem(&nilfs_fs_type); |
1302 | } | |
1303 | ||
1304 | module_init(init_nilfs_fs) | |
1305 | module_exit(exit_nilfs_fs) |