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> | |
783f6184 | 46 | #include <linux/crc32.h> |
783f6184 RK |
47 | #include <linux/vfs.h> |
48 | #include <linux/writeback.h> | |
b58a285b JS |
49 | #include <linux/seq_file.h> |
50 | #include <linux/mount.h> | |
783f6184 | 51 | #include "nilfs.h" |
8e656fd5 | 52 | #include "export.h" |
783f6184 RK |
53 | #include "mdt.h" |
54 | #include "alloc.h" | |
05d0e94b RK |
55 | #include "btree.h" |
56 | #include "btnode.h" | |
783f6184 RK |
57 | #include "page.h" |
58 | #include "cpfile.h" | |
59 | #include "ifile.h" | |
60 | #include "dat.h" | |
61 | #include "segment.h" | |
62 | #include "segbuf.h" | |
63 | ||
64 | MODULE_AUTHOR("NTT Corp."); | |
65 | MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem " | |
66 | "(NILFS)"); | |
783f6184 RK |
67 | MODULE_LICENSE("GPL"); |
68 | ||
abc0b50b | 69 | static struct kmem_cache *nilfs_inode_cachep; |
41c88bd7 LH |
70 | struct kmem_cache *nilfs_transaction_cachep; |
71 | struct kmem_cache *nilfs_segbuf_cachep; | |
72 | struct kmem_cache *nilfs_btree_path_cache; | |
73 | ||
5beb6e0b | 74 | static int nilfs_setup_super(struct nilfs_sb_info *sbi, int is_mount); |
783f6184 | 75 | static int nilfs_remount(struct super_block *sb, int *flags, char *data); |
783f6184 | 76 | |
c8a11c8a RK |
77 | static void nilfs_set_error(struct nilfs_sb_info *sbi) |
78 | { | |
79 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 | 80 | struct nilfs_super_block **sbp; |
c8a11c8a RK |
81 | |
82 | down_write(&nilfs->ns_sem); | |
83 | if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { | |
84 | nilfs->ns_mount_state |= NILFS_ERROR_FS; | |
b2ac86e1 | 85 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
86 | if (likely(sbp)) { |
87 | sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
b2ac86e1 JS |
88 | if (sbp[1]) |
89 | sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
90 | nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL); | |
d26493b6 | 91 | } |
c8a11c8a RK |
92 | } |
93 | up_write(&nilfs->ns_sem); | |
94 | } | |
95 | ||
783f6184 RK |
96 | /** |
97 | * nilfs_error() - report failure condition on a filesystem | |
98 | * | |
99 | * nilfs_error() sets an ERROR_FS flag on the superblock as well as | |
100 | * reporting an error message. It should be called when NILFS detects | |
101 | * incoherences or defects of meta data on disk. As for sustainable | |
102 | * errors such as a single-shot I/O error, nilfs_warning() or the printk() | |
103 | * function should be used instead. | |
104 | * | |
105 | * The segment constructor must not call this function because it can | |
106 | * kill itself. | |
107 | */ | |
108 | void nilfs_error(struct super_block *sb, const char *function, | |
109 | const char *fmt, ...) | |
110 | { | |
3b2ce58b | 111 | struct the_nilfs *nilfs = sbi->s_nilfs; |
b004a5eb | 112 | struct va_format vaf; |
783f6184 RK |
113 | va_list args; |
114 | ||
115 | va_start(args, fmt); | |
b004a5eb JP |
116 | |
117 | vaf.fmt = fmt; | |
118 | vaf.va = &args; | |
119 | ||
120 | printk(KERN_CRIT "NILFS error (device %s): %s: %pV\n", | |
121 | sb->s_id, function, &vaf); | |
122 | ||
783f6184 RK |
123 | va_end(args); |
124 | ||
125 | if (!(sb->s_flags & MS_RDONLY)) { | |
c8a11c8a | 126 | nilfs_set_error(sbi); |
783f6184 | 127 | |
3b2ce58b | 128 | if (nilfs_test_opt(nilfs, ERRORS_RO)) { |
783f6184 RK |
129 | printk(KERN_CRIT "Remounting filesystem read-only\n"); |
130 | sb->s_flags |= MS_RDONLY; | |
131 | } | |
132 | } | |
133 | ||
3b2ce58b | 134 | if (nilfs_test_opt(nilfs, ERRORS_PANIC)) |
783f6184 RK |
135 | panic("NILFS (device %s): panic forced after error\n", |
136 | sb->s_id); | |
137 | } | |
138 | ||
139 | void nilfs_warning(struct super_block *sb, const char *function, | |
140 | const char *fmt, ...) | |
141 | { | |
b004a5eb | 142 | struct va_format vaf; |
783f6184 RK |
143 | va_list args; |
144 | ||
145 | va_start(args, fmt); | |
b004a5eb JP |
146 | |
147 | vaf.fmt = fmt; | |
148 | vaf.va = &args; | |
149 | ||
150 | printk(KERN_WARNING "NILFS warning (device %s): %s: %pV\n", | |
151 | sb->s_id, function, &vaf); | |
152 | ||
783f6184 RK |
153 | va_end(args); |
154 | } | |
155 | ||
783f6184 | 156 | |
2879ed66 | 157 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
783f6184 RK |
158 | { |
159 | struct nilfs_inode_info *ii; | |
160 | ||
161 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); | |
162 | if (!ii) | |
163 | return NULL; | |
164 | ii->i_bh = NULL; | |
165 | ii->i_state = 0; | |
0e14a359 | 166 | ii->i_cno = 0; |
783f6184 | 167 | ii->vfs_inode.i_version = 1; |
2879ed66 | 168 | nilfs_btnode_cache_init(&ii->i_btnode_cache, sb->s_bdi); |
783f6184 RK |
169 | return &ii->vfs_inode; |
170 | } | |
171 | ||
fa0d7e3d | 172 | static void nilfs_i_callback(struct rcu_head *head) |
783f6184 | 173 | { |
fa0d7e3d | 174 | struct inode *inode = container_of(head, struct inode, i_rcu); |
b91c9a97 RK |
175 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
176 | ||
fa0d7e3d NP |
177 | INIT_LIST_HEAD(&inode->i_dentry); |
178 | ||
b91c9a97 RK |
179 | if (mdi) { |
180 | kfree(mdi->mi_bgl); /* kfree(NULL) is safe */ | |
181 | kfree(mdi); | |
182 | } | |
783f6184 RK |
183 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
184 | } | |
185 | ||
fa0d7e3d NP |
186 | void nilfs_destroy_inode(struct inode *inode) |
187 | { | |
188 | call_rcu(&inode->i_rcu, nilfs_i_callback); | |
189 | } | |
190 | ||
b2ac86e1 | 191 | static int nilfs_sync_super(struct nilfs_sb_info *sbi, int flag) |
783f6184 RK |
192 | { |
193 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
194 | int err; | |
783f6184 | 195 | |
783f6184 | 196 | retry: |
e339ad31 | 197 | set_buffer_dirty(nilfs->ns_sbh[0]); |
3b2ce58b | 198 | if (nilfs_test_opt(nilfs, BARRIER)) { |
87e99511 | 199 | err = __sync_dirty_buffer(nilfs->ns_sbh[0], |
f8c131f5 | 200 | WRITE_SYNC | WRITE_FLUSH_FUA); |
87e99511 CH |
201 | } else { |
202 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); | |
783f6184 | 203 | } |
87e99511 | 204 | |
e339ad31 | 205 | if (unlikely(err)) { |
783f6184 RK |
206 | printk(KERN_ERR |
207 | "NILFS: unable to write superblock (err=%d)\n", err); | |
e339ad31 | 208 | if (err == -EIO && nilfs->ns_sbh[1]) { |
b2ac86e1 JS |
209 | /* |
210 | * sbp[0] points to newer log than sbp[1], | |
211 | * so copy sbp[0] to sbp[1] to take over sbp[0]. | |
212 | */ | |
213 | memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0], | |
214 | nilfs->ns_sbsize); | |
e339ad31 RK |
215 | nilfs_fall_back_super_block(nilfs); |
216 | goto retry; | |
217 | } | |
218 | } else { | |
219 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; | |
220 | ||
b2ac86e1 JS |
221 | nilfs->ns_sbwcount++; |
222 | ||
e339ad31 RK |
223 | /* |
224 | * The latest segment becomes trailable from the position | |
225 | * written in superblock. | |
226 | */ | |
783f6184 | 227 | clear_nilfs_discontinued(nilfs); |
e339ad31 RK |
228 | |
229 | /* update GC protection for recent segments */ | |
230 | if (nilfs->ns_sbh[1]) { | |
b2ac86e1 | 231 | if (flag == NILFS_SB_COMMIT_ALL) { |
e339ad31 | 232 | set_buffer_dirty(nilfs->ns_sbh[1]); |
b2ac86e1 JS |
233 | if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0) |
234 | goto out; | |
e339ad31 | 235 | } |
b2ac86e1 JS |
236 | if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) < |
237 | le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno)) | |
238 | sbp = nilfs->ns_sbp[1]; | |
e339ad31 | 239 | } |
783f6184 | 240 | |
b2ac86e1 JS |
241 | spin_lock(&nilfs->ns_last_segment_lock); |
242 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); | |
243 | spin_unlock(&nilfs->ns_last_segment_lock); | |
244 | } | |
245 | out: | |
783f6184 RK |
246 | return err; |
247 | } | |
248 | ||
60f46b7e RK |
249 | void nilfs_set_log_cursor(struct nilfs_super_block *sbp, |
250 | struct the_nilfs *nilfs) | |
251 | { | |
252 | sector_t nfreeblocks; | |
253 | ||
254 | /* nilfs->ns_sem must be locked by the caller. */ | |
255 | nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
256 | sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
257 | ||
258 | spin_lock(&nilfs->ns_last_segment_lock); | |
259 | sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
260 | sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
261 | sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
262 | spin_unlock(&nilfs->ns_last_segment_lock); | |
263 | } | |
264 | ||
b2ac86e1 JS |
265 | struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *sbi, |
266 | int flip) | |
783f6184 RK |
267 | { |
268 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
e339ad31 | 269 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 270 | |
d26493b6 | 271 | /* nilfs->ns_sem must be locked by the caller. */ |
34cb9b5c | 272 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
d26493b6 JS |
273 | if (sbp[1] && |
274 | sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
b2ac86e1 | 275 | memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); |
d26493b6 | 276 | } else { |
e339ad31 RK |
277 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", |
278 | sbi->s_super->s_id); | |
d26493b6 | 279 | return NULL; |
e339ad31 | 280 | } |
b2ac86e1 JS |
281 | } else if (sbp[1] && |
282 | sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
283 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
e339ad31 | 284 | } |
b2ac86e1 JS |
285 | |
286 | if (flip && sbp[1]) | |
287 | nilfs_swap_super_block(nilfs); | |
288 | ||
d26493b6 JS |
289 | return sbp; |
290 | } | |
291 | ||
b2ac86e1 | 292 | int nilfs_commit_super(struct nilfs_sb_info *sbi, int flag) |
d26493b6 JS |
293 | { |
294 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
295 | struct nilfs_super_block **sbp = nilfs->ns_sbp; | |
296 | time_t t; | |
297 | ||
298 | /* nilfs->ns_sem must be locked by the caller. */ | |
e339ad31 | 299 | t = get_seconds(); |
b2ac86e1 | 300 | nilfs->ns_sbwtime = t; |
e339ad31 RK |
301 | sbp[0]->s_wtime = cpu_to_le64(t); |
302 | sbp[0]->s_sum = 0; | |
303 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
304 | (unsigned char *)sbp[0], | |
305 | nilfs->ns_sbsize)); | |
b2ac86e1 JS |
306 | if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) { |
307 | sbp[1]->s_wtime = sbp[0]->s_wtime; | |
308 | sbp[1]->s_sum = 0; | |
309 | sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
310 | (unsigned char *)sbp[1], | |
311 | nilfs->ns_sbsize)); | |
e339ad31 | 312 | } |
e605f0a7 | 313 | clear_nilfs_sb_dirty(nilfs); |
b2ac86e1 | 314 | return nilfs_sync_super(sbi, flag); |
783f6184 RK |
315 | } |
316 | ||
7ecaa46c RK |
317 | /** |
318 | * nilfs_cleanup_super() - write filesystem state for cleanup | |
319 | * @sbi: nilfs_sb_info to be unmounted or degraded to read-only | |
320 | * | |
321 | * This function restores state flags in the on-disk super block. | |
322 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the | |
323 | * filesystem was not clean previously. | |
324 | */ | |
325 | int nilfs_cleanup_super(struct nilfs_sb_info *sbi) | |
326 | { | |
d26493b6 | 327 | struct nilfs_super_block **sbp; |
b2ac86e1 | 328 | int flag = NILFS_SB_COMMIT; |
d26493b6 | 329 | int ret = -EIO; |
7ecaa46c | 330 | |
b2ac86e1 | 331 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
332 | if (sbp) { |
333 | sbp[0]->s_state = cpu_to_le16(sbi->s_nilfs->ns_mount_state); | |
b2ac86e1 JS |
334 | nilfs_set_log_cursor(sbp[0], sbi->s_nilfs); |
335 | if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { | |
336 | /* | |
337 | * make the "clean" flag also to the opposite | |
338 | * super block if both super blocks point to | |
339 | * the same checkpoint. | |
340 | */ | |
341 | sbp[1]->s_state = sbp[0]->s_state; | |
342 | flag = NILFS_SB_COMMIT_ALL; | |
343 | } | |
344 | ret = nilfs_commit_super(sbi, flag); | |
d26493b6 | 345 | } |
7ecaa46c RK |
346 | return ret; |
347 | } | |
348 | ||
783f6184 RK |
349 | static void nilfs_put_super(struct super_block *sb) |
350 | { | |
351 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
352 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
353 | ||
354 | nilfs_detach_segment_constructor(sbi); | |
355 | ||
356 | if (!(sb->s_flags & MS_RDONLY)) { | |
357 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 358 | nilfs_cleanup_super(sbi); |
783f6184 RK |
359 | up_write(&nilfs->ns_sem); |
360 | } | |
361 | ||
f1e89c86 RK |
362 | iput(nilfs->ns_sufile); |
363 | iput(nilfs->ns_cpfile); | |
364 | iput(nilfs->ns_dat); | |
365 | ||
348fe8da | 366 | destroy_nilfs(nilfs); |
783f6184 RK |
367 | sbi->s_super = NULL; |
368 | sb->s_fs_info = NULL; | |
f11459ad | 369 | kfree(sbi); |
783f6184 RK |
370 | } |
371 | ||
783f6184 RK |
372 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
373 | { | |
6233caa9 JS |
374 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
375 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 | 376 | struct nilfs_super_block **sbp; |
783f6184 RK |
377 | int err = 0; |
378 | ||
379 | /* This function is called when super block should be written back */ | |
380 | if (wait) | |
381 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
382 | |
383 | down_write(&nilfs->ns_sem); | |
d26493b6 | 384 | if (nilfs_sb_dirty(nilfs)) { |
b2ac86e1 JS |
385 | sbp = nilfs_prepare_super(sbi, nilfs_sb_will_flip(nilfs)); |
386 | if (likely(sbp)) { | |
387 | nilfs_set_log_cursor(sbp[0], nilfs); | |
388 | nilfs_commit_super(sbi, NILFS_SB_COMMIT); | |
389 | } | |
d26493b6 | 390 | } |
6233caa9 JS |
391 | up_write(&nilfs->ns_sem); |
392 | ||
783f6184 RK |
393 | return err; |
394 | } | |
395 | ||
4d8d9293 RK |
396 | int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno, int curr_mnt, |
397 | struct nilfs_root **rootp) | |
783f6184 RK |
398 | { |
399 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
4d8d9293 | 400 | struct nilfs_root *root; |
783f6184 RK |
401 | struct nilfs_checkpoint *raw_cp; |
402 | struct buffer_head *bh_cp; | |
4d8d9293 | 403 | int err = -ENOMEM; |
783f6184 | 404 | |
4d8d9293 RK |
405 | root = nilfs_find_or_create_root( |
406 | nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); | |
407 | if (!root) | |
408 | return err; | |
783f6184 | 409 | |
e912a5b6 RK |
410 | if (root->ifile) |
411 | goto reuse; /* already attached checkpoint */ | |
783f6184 | 412 | |
1154ecbd | 413 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
414 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
415 | &bh_cp); | |
1154ecbd | 416 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
417 | if (unlikely(err)) { |
418 | if (err == -ENOENT || err == -EINVAL) { | |
419 | printk(KERN_ERR | |
420 | "NILFS: Invalid checkpoint " | |
421 | "(checkpoint number=%llu)\n", | |
422 | (unsigned long long)cno); | |
423 | err = -EINVAL; | |
424 | } | |
425 | goto failed; | |
426 | } | |
f1e89c86 RK |
427 | |
428 | err = nilfs_ifile_read(sbi->s_super, root, nilfs->ns_inode_size, | |
429 | &raw_cp->cp_ifile_inode, &root->ifile); | |
430 | if (err) | |
783f6184 | 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 | } | |
783f6184 | 449 | |
5beb6e0b RK |
450 | static int nilfs_freeze(struct super_block *sb) |
451 | { | |
452 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
453 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
454 | int err; | |
455 | ||
456 | if (sb->s_flags & MS_RDONLY) | |
457 | return 0; | |
783f6184 | 458 | |
5beb6e0b RK |
459 | /* Mark super block clean */ |
460 | down_write(&nilfs->ns_sem); | |
461 | err = nilfs_cleanup_super(sbi); | |
462 | up_write(&nilfs->ns_sem); | |
783f6184 RK |
463 | return err; |
464 | } | |
465 | ||
5beb6e0b | 466 | static int nilfs_unfreeze(struct super_block *sb) |
783f6184 | 467 | { |
5beb6e0b | 468 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
783f6184 RK |
469 | struct the_nilfs *nilfs = sbi->s_nilfs; |
470 | ||
5beb6e0b RK |
471 | if (sb->s_flags & MS_RDONLY) |
472 | return 0; | |
473 | ||
474 | down_write(&nilfs->ns_sem); | |
475 | nilfs_setup_super(sbi, false); | |
476 | up_write(&nilfs->ns_sem); | |
477 | return 0; | |
783f6184 RK |
478 | } |
479 | ||
783f6184 RK |
480 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
481 | { | |
482 | struct super_block *sb = dentry->d_sb; | |
b7c06342 RK |
483 | struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root; |
484 | struct the_nilfs *nilfs = root->nilfs; | |
c306af23 | 485 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
783f6184 RK |
486 | unsigned long long blocks; |
487 | unsigned long overhead; | |
488 | unsigned long nrsvblocks; | |
489 | sector_t nfreeblocks; | |
783f6184 RK |
490 | int err; |
491 | ||
492 | /* | |
493 | * Compute all of the segment blocks | |
494 | * | |
495 | * The blocks before first segment and after last segment | |
496 | * are excluded. | |
497 | */ | |
498 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
499 | - nilfs->ns_first_data_block; | |
500 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
501 | ||
502 | /* | |
503 | * Compute the overhead | |
504 | * | |
7a65004b | 505 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
506 | * We must count them as the overhead. |
507 | */ | |
508 | overhead = 0; | |
509 | ||
510 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
511 | if (unlikely(err)) | |
512 | return err; | |
513 | ||
514 | buf->f_type = NILFS_SUPER_MAGIC; | |
515 | buf->f_bsize = sb->s_blocksize; | |
516 | buf->f_blocks = blocks - overhead; | |
517 | buf->f_bfree = nfreeblocks; | |
518 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
519 | (buf->f_bfree - nrsvblocks) : 0; | |
b7c06342 | 520 | buf->f_files = atomic_read(&root->inodes_count); |
783f6184 RK |
521 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ |
522 | buf->f_namelen = NILFS_NAME_LEN; | |
c306af23 RK |
523 | buf->f_fsid.val[0] = (u32)id; |
524 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
525 | ||
783f6184 RK |
526 | return 0; |
527 | } | |
528 | ||
b58a285b JS |
529 | static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
530 | { | |
531 | struct super_block *sb = vfs->mnt_sb; | |
3b2ce58b | 532 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
f11459ad | 533 | struct nilfs_root *root = NILFS_I(vfs->mnt_root->d_inode)->i_root; |
b58a285b | 534 | |
3b2ce58b | 535 | if (!nilfs_test_opt(nilfs, BARRIER)) |
c6b4d57d | 536 | seq_puts(seq, ",nobarrier"); |
f11459ad RK |
537 | if (root->cno != NILFS_CPTREE_CURRENT_CNO) |
538 | seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno); | |
3b2ce58b | 539 | if (nilfs_test_opt(nilfs, ERRORS_PANIC)) |
c6b4d57d | 540 | seq_puts(seq, ",errors=panic"); |
3b2ce58b | 541 | if (nilfs_test_opt(nilfs, ERRORS_CONT)) |
c6b4d57d | 542 | seq_puts(seq, ",errors=continue"); |
3b2ce58b | 543 | if (nilfs_test_opt(nilfs, STRICT_ORDER)) |
c6b4d57d | 544 | seq_puts(seq, ",order=strict"); |
3b2ce58b | 545 | if (nilfs_test_opt(nilfs, NORECOVERY)) |
c6b4d57d | 546 | seq_puts(seq, ",norecovery"); |
3b2ce58b | 547 | if (nilfs_test_opt(nilfs, DISCARD)) |
c6b4d57d | 548 | seq_puts(seq, ",discard"); |
b58a285b JS |
549 | |
550 | return 0; | |
551 | } | |
552 | ||
b87221de | 553 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
554 | .alloc_inode = nilfs_alloc_inode, |
555 | .destroy_inode = nilfs_destroy_inode, | |
556 | .dirty_inode = nilfs_dirty_inode, | |
557 | /* .write_inode = nilfs_write_inode, */ | |
558 | /* .put_inode = nilfs_put_inode, */ | |
559 | /* .drop_inode = nilfs_drop_inode, */ | |
6fd1e5c9 | 560 | .evict_inode = nilfs_evict_inode, |
783f6184 | 561 | .put_super = nilfs_put_super, |
1dfa2710 | 562 | /* .write_super = nilfs_write_super, */ |
783f6184 | 563 | .sync_fs = nilfs_sync_fs, |
5beb6e0b RK |
564 | .freeze_fs = nilfs_freeze, |
565 | .unfreeze_fs = nilfs_unfreeze, | |
783f6184 RK |
566 | /* .write_super_lockfs */ |
567 | /* .unlockfs */ | |
568 | .statfs = nilfs_statfs, | |
569 | .remount_fs = nilfs_remount, | |
783f6184 | 570 | /* .umount_begin */ |
b58a285b | 571 | .show_options = nilfs_show_options |
783f6184 RK |
572 | }; |
573 | ||
783f6184 RK |
574 | enum { |
575 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
773bc4f3 | 576 | Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
802d3177 | 577 | Opt_discard, Opt_nodiscard, Opt_err, |
783f6184 RK |
578 | }; |
579 | ||
580 | static match_table_t tokens = { | |
581 | {Opt_err_cont, "errors=continue"}, | |
582 | {Opt_err_panic, "errors=panic"}, | |
583 | {Opt_err_ro, "errors=remount-ro"}, | |
773bc4f3 | 584 | {Opt_barrier, "barrier"}, |
91f1953b | 585 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
586 | {Opt_snapshot, "cp=%u"}, |
587 | {Opt_order, "order=%s"}, | |
0234576d | 588 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 589 | {Opt_discard, "discard"}, |
802d3177 | 590 | {Opt_nodiscard, "nodiscard"}, |
783f6184 RK |
591 | {Opt_err, NULL} |
592 | }; | |
593 | ||
7c017457 | 594 | static int parse_options(char *options, struct super_block *sb, int is_remount) |
783f6184 | 595 | { |
3b2ce58b | 596 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
783f6184 RK |
597 | char *p; |
598 | substring_t args[MAX_OPT_ARGS]; | |
783f6184 RK |
599 | |
600 | if (!options) | |
601 | return 1; | |
602 | ||
603 | while ((p = strsep(&options, ",")) != NULL) { | |
604 | int token; | |
605 | if (!*p) | |
606 | continue; | |
607 | ||
608 | token = match_token(p, tokens, args); | |
609 | switch (token) { | |
773bc4f3 | 610 | case Opt_barrier: |
3b2ce58b | 611 | nilfs_set_opt(nilfs, BARRIER); |
773bc4f3 | 612 | break; |
91f1953b | 613 | case Opt_nobarrier: |
3b2ce58b | 614 | nilfs_clear_opt(nilfs, BARRIER); |
783f6184 RK |
615 | break; |
616 | case Opt_order: | |
617 | if (strcmp(args[0].from, "relaxed") == 0) | |
618 | /* Ordered data semantics */ | |
3b2ce58b | 619 | nilfs_clear_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
620 | else if (strcmp(args[0].from, "strict") == 0) |
621 | /* Strict in-order semantics */ | |
3b2ce58b | 622 | nilfs_set_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
623 | else |
624 | return 0; | |
625 | break; | |
626 | case Opt_err_panic: | |
3b2ce58b | 627 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC); |
783f6184 RK |
628 | break; |
629 | case Opt_err_ro: | |
3b2ce58b | 630 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO); |
783f6184 RK |
631 | break; |
632 | case Opt_err_cont: | |
3b2ce58b | 633 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT); |
783f6184 RK |
634 | break; |
635 | case Opt_snapshot: | |
7c017457 | 636 | if (is_remount) { |
f11459ad RK |
637 | printk(KERN_ERR |
638 | "NILFS: \"%s\" option is invalid " | |
639 | "for remount.\n", p); | |
783f6184 | 640 | return 0; |
7c017457 | 641 | } |
783f6184 | 642 | break; |
0234576d | 643 | case Opt_norecovery: |
3b2ce58b | 644 | nilfs_set_opt(nilfs, NORECOVERY); |
0234576d | 645 | break; |
e902ec99 | 646 | case Opt_discard: |
3b2ce58b | 647 | nilfs_set_opt(nilfs, DISCARD); |
e902ec99 | 648 | break; |
802d3177 | 649 | case Opt_nodiscard: |
3b2ce58b | 650 | nilfs_clear_opt(nilfs, DISCARD); |
802d3177 | 651 | break; |
783f6184 RK |
652 | default: |
653 | printk(KERN_ERR | |
654 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
655 | return 0; | |
656 | } | |
657 | } | |
658 | return 1; | |
659 | } | |
660 | ||
661 | static inline void | |
3b2ce58b | 662 | nilfs_set_default_options(struct super_block *sb, |
783f6184 RK |
663 | struct nilfs_super_block *sbp) |
664 | { | |
3b2ce58b RK |
665 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
666 | ||
667 | nilfs->ns_mount_opt = | |
277a6a34 | 668 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
669 | } |
670 | ||
5beb6e0b | 671 | static int nilfs_setup_super(struct nilfs_sb_info *sbi, int is_mount) |
783f6184 RK |
672 | { |
673 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 JS |
674 | struct nilfs_super_block **sbp; |
675 | int max_mnt_count; | |
676 | int mnt_count; | |
677 | ||
678 | /* nilfs->ns_sem must be locked by the caller. */ | |
b2ac86e1 | 679 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
680 | if (!sbp) |
681 | return -EIO; | |
682 | ||
5beb6e0b RK |
683 | if (!is_mount) |
684 | goto skip_mount_setup; | |
685 | ||
d26493b6 JS |
686 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); |
687 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); | |
783f6184 | 688 | |
f50a4c81 | 689 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
783f6184 RK |
690 | printk(KERN_WARNING |
691 | "NILFS warning: mounting fs with errors\n"); | |
692 | #if 0 | |
693 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
694 | printk(KERN_WARNING | |
695 | "NILFS warning: maximal mount count reached\n"); | |
696 | #endif | |
697 | } | |
698 | if (!max_mnt_count) | |
d26493b6 | 699 | sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
783f6184 | 700 | |
d26493b6 | 701 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
5beb6e0b RK |
702 | sbp[0]->s_mtime = cpu_to_le64(get_seconds()); |
703 | ||
704 | skip_mount_setup: | |
d26493b6 JS |
705 | sbp[0]->s_state = |
706 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); | |
b2ac86e1 | 707 | /* synchronize sbp[1] with sbp[0] */ |
0ca7a5b9 RK |
708 | if (sbp[1]) |
709 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
b2ac86e1 | 710 | return nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL); |
783f6184 RK |
711 | } |
712 | ||
e339ad31 RK |
713 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
714 | u64 pos, int blocksize, | |
715 | struct buffer_head **pbh) | |
783f6184 | 716 | { |
e339ad31 RK |
717 | unsigned long long sb_index = pos; |
718 | unsigned long offset; | |
783f6184 | 719 | |
e339ad31 | 720 | offset = do_div(sb_index, blocksize); |
783f6184 | 721 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 722 | if (!*pbh) |
783f6184 | 723 | return NULL; |
783f6184 RK |
724 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
725 | } | |
726 | ||
783f6184 RK |
727 | int nilfs_store_magic_and_option(struct super_block *sb, |
728 | struct nilfs_super_block *sbp, | |
729 | char *data) | |
730 | { | |
574e6c31 | 731 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
783f6184 | 732 | |
783f6184 RK |
733 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
734 | ||
735 | /* FS independent flags */ | |
736 | #ifdef NILFS_ATIME_DISABLE | |
737 | sb->s_flags |= MS_NOATIME; | |
738 | #endif | |
739 | ||
3b2ce58b | 740 | nilfs_set_default_options(sb, sbp); |
783f6184 | 741 | |
574e6c31 RK |
742 | nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid); |
743 | nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid); | |
744 | nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval); | |
745 | nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max); | |
783f6184 | 746 | |
7c017457 | 747 | return !parse_options(data, sb, 0) ? -EINVAL : 0 ; |
783f6184 RK |
748 | } |
749 | ||
c5ca48aa RK |
750 | int nilfs_check_feature_compatibility(struct super_block *sb, |
751 | struct nilfs_super_block *sbp) | |
752 | { | |
753 | __u64 features; | |
754 | ||
755 | features = le64_to_cpu(sbp->s_feature_incompat) & | |
756 | ~NILFS_FEATURE_INCOMPAT_SUPP; | |
757 | if (features) { | |
758 | printk(KERN_ERR "NILFS: couldn't mount because of unsupported " | |
759 | "optional features (%llx)\n", | |
760 | (unsigned long long)features); | |
761 | return -EINVAL; | |
762 | } | |
763 | features = le64_to_cpu(sbp->s_feature_compat_ro) & | |
764 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
765 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
766 | printk(KERN_ERR "NILFS: couldn't mount RDWR because of " | |
767 | "unsupported optional features (%llx)\n", | |
768 | (unsigned long long)features); | |
769 | return -EINVAL; | |
770 | } | |
771 | return 0; | |
772 | } | |
773 | ||
367ea334 RK |
774 | static int nilfs_get_root_dentry(struct super_block *sb, |
775 | struct nilfs_root *root, | |
776 | struct dentry **root_dentry) | |
777 | { | |
778 | struct inode *inode; | |
779 | struct dentry *dentry; | |
780 | int ret = 0; | |
781 | ||
782 | inode = nilfs_iget(sb, root, NILFS_ROOT_INO); | |
783 | if (IS_ERR(inode)) { | |
784 | printk(KERN_ERR "NILFS: get root inode failed\n"); | |
785 | ret = PTR_ERR(inode); | |
786 | goto out; | |
787 | } | |
788 | if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { | |
789 | iput(inode); | |
790 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); | |
791 | ret = -EINVAL; | |
792 | goto out; | |
793 | } | |
794 | ||
f11459ad RK |
795 | if (root->cno == NILFS_CPTREE_CURRENT_CNO) { |
796 | dentry = d_find_alias(inode); | |
797 | if (!dentry) { | |
798 | dentry = d_alloc_root(inode); | |
799 | if (!dentry) { | |
800 | iput(inode); | |
801 | ret = -ENOMEM; | |
802 | goto failed_dentry; | |
803 | } | |
804 | } else { | |
805 | iput(inode); | |
806 | } | |
807 | } else { | |
808 | dentry = d_obtain_alias(inode); | |
809 | if (IS_ERR(dentry)) { | |
810 | ret = PTR_ERR(dentry); | |
811 | goto failed_dentry; | |
812 | } | |
367ea334 RK |
813 | } |
814 | *root_dentry = dentry; | |
815 | out: | |
816 | return ret; | |
f11459ad RK |
817 | |
818 | failed_dentry: | |
819 | printk(KERN_ERR "NILFS: get root dentry failed\n"); | |
820 | goto out; | |
367ea334 RK |
821 | } |
822 | ||
ab4d8f7e RK |
823 | static int nilfs_attach_snapshot(struct super_block *s, __u64 cno, |
824 | struct dentry **root_dentry) | |
825 | { | |
826 | struct the_nilfs *nilfs = NILFS_SB(s)->s_nilfs; | |
827 | struct nilfs_root *root; | |
828 | int ret; | |
829 | ||
830 | down_read(&nilfs->ns_segctor_sem); | |
831 | ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno); | |
832 | up_read(&nilfs->ns_segctor_sem); | |
833 | if (ret < 0) { | |
834 | ret = (ret == -ENOENT) ? -EINVAL : ret; | |
835 | goto out; | |
836 | } else if (!ret) { | |
837 | printk(KERN_ERR "NILFS: The specified checkpoint is " | |
838 | "not a snapshot (checkpoint number=%llu).\n", | |
839 | (unsigned long long)cno); | |
840 | ret = -EINVAL; | |
841 | goto out; | |
842 | } | |
843 | ||
844 | ret = nilfs_attach_checkpoint(NILFS_SB(s), cno, false, &root); | |
845 | if (ret) { | |
846 | printk(KERN_ERR "NILFS: error loading snapshot " | |
847 | "(checkpoint number=%llu).\n", | |
848 | (unsigned long long)cno); | |
849 | goto out; | |
850 | } | |
851 | ret = nilfs_get_root_dentry(s, root, root_dentry); | |
852 | nilfs_put_root(root); | |
853 | out: | |
854 | return ret; | |
855 | } | |
856 | ||
f11459ad RK |
857 | static int nilfs_tree_was_touched(struct dentry *root_dentry) |
858 | { | |
b7ab39f6 | 859 | return root_dentry->d_count > 1; |
f11459ad RK |
860 | } |
861 | ||
862 | /** | |
863 | * nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint | |
864 | * @root_dentry: root dentry of the tree to be shrunk | |
865 | * | |
866 | * This function returns true if the tree was in-use. | |
867 | */ | |
868 | static int nilfs_try_to_shrink_tree(struct dentry *root_dentry) | |
869 | { | |
870 | if (have_submounts(root_dentry)) | |
871 | return true; | |
872 | shrink_dcache_parent(root_dentry); | |
873 | return nilfs_tree_was_touched(root_dentry); | |
874 | } | |
875 | ||
032dbb3b RK |
876 | int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno) |
877 | { | |
878 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; | |
879 | struct nilfs_root *root; | |
880 | struct inode *inode; | |
881 | struct dentry *dentry; | |
882 | int ret; | |
883 | ||
884 | if (cno < 0 || cno > nilfs->ns_cno) | |
885 | return false; | |
886 | ||
887 | if (cno >= nilfs_last_cno(nilfs)) | |
888 | return true; /* protect recent checkpoints */ | |
889 | ||
890 | ret = false; | |
891 | root = nilfs_lookup_root(NILFS_SB(sb)->s_nilfs, cno); | |
892 | if (root) { | |
893 | inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO); | |
894 | if (inode) { | |
895 | dentry = d_find_alias(inode); | |
896 | if (dentry) { | |
897 | if (nilfs_tree_was_touched(dentry)) | |
898 | ret = nilfs_try_to_shrink_tree(dentry); | |
899 | dput(dentry); | |
900 | } | |
901 | iput(inode); | |
902 | } | |
903 | nilfs_put_root(root); | |
904 | } | |
905 | return ret; | |
906 | } | |
907 | ||
783f6184 RK |
908 | /** |
909 | * nilfs_fill_super() - initialize a super block instance | |
910 | * @sb: super_block | |
911 | * @data: mount options | |
912 | * @silent: silent mode flag | |
783f6184 | 913 | * |
aa7dfb89 | 914 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
915 | * So, the recovery process is protected from other simultaneous mounts. |
916 | */ | |
917 | static int | |
348fe8da | 918 | nilfs_fill_super(struct super_block *sb, void *data, int silent) |
783f6184 | 919 | { |
348fe8da | 920 | struct the_nilfs *nilfs; |
783f6184 | 921 | struct nilfs_sb_info *sbi; |
4d8d9293 | 922 | struct nilfs_root *fsroot; |
026a7d63 | 923 | struct backing_dev_info *bdi; |
783f6184 RK |
924 | __u64 cno; |
925 | int err; | |
926 | ||
927 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
928 | if (!sbi) | |
929 | return -ENOMEM; | |
930 | ||
931 | sb->s_fs_info = sbi; | |
348fe8da | 932 | sbi->s_super = sb; |
783f6184 | 933 | |
348fe8da RK |
934 | nilfs = alloc_nilfs(sb->s_bdev); |
935 | if (!nilfs) { | |
936 | err = -ENOMEM; | |
937 | goto failed_sbi; | |
938 | } | |
783f6184 | 939 | sbi->s_nilfs = nilfs; |
783f6184 RK |
940 | |
941 | err = init_nilfs(nilfs, sbi, (char *)data); | |
942 | if (err) | |
348fe8da | 943 | goto failed_nilfs; |
783f6184 | 944 | |
783f6184 RK |
945 | sb->s_op = &nilfs_sops; |
946 | sb->s_export_op = &nilfs_export_ops; | |
947 | sb->s_root = NULL; | |
61239230 | 948 | sb->s_time_gran = 1; |
026a7d63 RK |
949 | |
950 | bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info; | |
951 | sb->s_bdi = bdi ? : &default_backing_dev_info; | |
783f6184 | 952 | |
f50a4c81 RK |
953 | err = load_nilfs(nilfs, sbi); |
954 | if (err) | |
348fe8da | 955 | goto failed_nilfs; |
f50a4c81 | 956 | |
783f6184 | 957 | cno = nilfs_last_cno(nilfs); |
ab4d8f7e | 958 | err = nilfs_attach_checkpoint(sbi, cno, true, &fsroot); |
783f6184 | 959 | if (err) { |
f11459ad RK |
960 | printk(KERN_ERR "NILFS: error loading last checkpoint " |
961 | "(checkpoint number=%llu).\n", (unsigned long long)cno); | |
f1e89c86 | 962 | goto failed_unload; |
783f6184 RK |
963 | } |
964 | ||
965 | if (!(sb->s_flags & MS_RDONLY)) { | |
e912a5b6 | 966 | err = nilfs_attach_segment_constructor(sbi, fsroot); |
783f6184 RK |
967 | if (err) |
968 | goto failed_checkpoint; | |
969 | } | |
970 | ||
367ea334 RK |
971 | err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root); |
972 | if (err) | |
783f6184 | 973 | goto failed_segctor; |
783f6184 | 974 | |
4d8d9293 | 975 | nilfs_put_root(fsroot); |
783f6184 RK |
976 | |
977 | if (!(sb->s_flags & MS_RDONLY)) { | |
978 | down_write(&nilfs->ns_sem); | |
5beb6e0b | 979 | nilfs_setup_super(sbi, true); |
783f6184 RK |
980 | up_write(&nilfs->ns_sem); |
981 | } | |
982 | ||
783f6184 RK |
983 | return 0; |
984 | ||
783f6184 RK |
985 | failed_segctor: |
986 | nilfs_detach_segment_constructor(sbi); | |
987 | ||
988 | failed_checkpoint: | |
4d8d9293 | 989 | nilfs_put_root(fsroot); |
783f6184 | 990 | |
f1e89c86 RK |
991 | failed_unload: |
992 | iput(nilfs->ns_sufile); | |
993 | iput(nilfs->ns_cpfile); | |
994 | iput(nilfs->ns_dat); | |
995 | ||
348fe8da RK |
996 | failed_nilfs: |
997 | destroy_nilfs(nilfs); | |
783f6184 RK |
998 | |
999 | failed_sbi: | |
783f6184 | 1000 | sb->s_fs_info = NULL; |
f11459ad | 1001 | kfree(sbi); |
783f6184 RK |
1002 | return err; |
1003 | } | |
1004 | ||
1005 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
1006 | { | |
1007 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
783f6184 RK |
1008 | struct the_nilfs *nilfs = sbi->s_nilfs; |
1009 | unsigned long old_sb_flags; | |
06df0f99 | 1010 | unsigned long old_mount_opt; |
f11459ad | 1011 | int err; |
783f6184 RK |
1012 | |
1013 | old_sb_flags = sb->s_flags; | |
3b2ce58b | 1014 | old_mount_opt = nilfs->ns_mount_opt; |
783f6184 | 1015 | |
7c017457 | 1016 | if (!parse_options(data, sb, 1)) { |
783f6184 RK |
1017 | err = -EINVAL; |
1018 | goto restore_opts; | |
1019 | } | |
1020 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); | |
1021 | ||
d240e067 | 1022 | err = -EINVAL; |
783f6184 | 1023 | |
0234576d RK |
1024 | if (!nilfs_valid_fs(nilfs)) { |
1025 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1026 | "remount because the filesystem is in an " | |
1027 | "incomplete recovery state.\n", sb->s_id); | |
0234576d RK |
1028 | goto restore_opts; |
1029 | } | |
1030 | ||
783f6184 RK |
1031 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
1032 | goto out; | |
1033 | if (*flags & MS_RDONLY) { | |
1034 | /* Shutting down the segment constructor */ | |
1035 | nilfs_detach_segment_constructor(sbi); | |
1036 | sb->s_flags |= MS_RDONLY; | |
1037 | ||
783f6184 RK |
1038 | /* |
1039 | * Remounting a valid RW partition RDONLY, so set | |
1040 | * the RDONLY flag and then mark the partition as valid again. | |
1041 | */ | |
1042 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 1043 | nilfs_cleanup_super(sbi); |
783f6184 RK |
1044 | up_write(&nilfs->ns_sem); |
1045 | } else { | |
c5ca48aa | 1046 | __u64 features; |
e912a5b6 | 1047 | struct nilfs_root *root; |
c5ca48aa | 1048 | |
783f6184 RK |
1049 | /* |
1050 | * Mounting a RDONLY partition read-write, so reread and | |
1051 | * store the current valid flag. (It may have been changed | |
1052 | * by fsck since we originally mounted the partition.) | |
1053 | */ | |
c5ca48aa RK |
1054 | down_read(&nilfs->ns_sem); |
1055 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & | |
1056 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
1057 | up_read(&nilfs->ns_sem); | |
1058 | if (features) { | |
1059 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1060 | "remount RDWR because of unsupported optional " | |
1061 | "features (%llx)\n", | |
1062 | sb->s_id, (unsigned long long)features); | |
1063 | err = -EROFS; | |
1064 | goto restore_opts; | |
1065 | } | |
1066 | ||
783f6184 | 1067 | sb->s_flags &= ~MS_RDONLY; |
783f6184 | 1068 | |
e912a5b6 RK |
1069 | root = NILFS_I(sb->s_root->d_inode)->i_root; |
1070 | err = nilfs_attach_segment_constructor(sbi, root); | |
783f6184 | 1071 | if (err) |
e59399d0 | 1072 | goto restore_opts; |
783f6184 RK |
1073 | |
1074 | down_write(&nilfs->ns_sem); | |
5beb6e0b | 1075 | nilfs_setup_super(sbi, true); |
783f6184 | 1076 | up_write(&nilfs->ns_sem); |
783f6184 RK |
1077 | } |
1078 | out: | |
1079 | return 0; | |
1080 | ||
783f6184 RK |
1081 | restore_opts: |
1082 | sb->s_flags = old_sb_flags; | |
3b2ce58b | 1083 | nilfs->ns_mount_opt = old_mount_opt; |
783f6184 RK |
1084 | return err; |
1085 | } | |
1086 | ||
1087 | struct nilfs_super_data { | |
1088 | struct block_device *bdev; | |
6dd47406 | 1089 | struct nilfs_sb_info *sbi; |
783f6184 RK |
1090 | __u64 cno; |
1091 | int flags; | |
1092 | }; | |
1093 | ||
1094 | /** | |
1095 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
1096 | * @data: mount options | |
1097 | * @sd: nilfs_super_data | |
1098 | */ | |
1099 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
1100 | { | |
1101 | char *p, *options = data; | |
1102 | substring_t args[MAX_OPT_ARGS]; | |
c05dbfc2 | 1103 | int token; |
783f6184 RK |
1104 | int ret = 0; |
1105 | ||
1106 | do { | |
1107 | p = strsep(&options, ","); | |
1108 | if (p != NULL && *p) { | |
1109 | token = match_token(p, tokens, args); | |
1110 | if (token == Opt_snapshot) { | |
c05dbfc2 | 1111 | if (!(sd->flags & MS_RDONLY)) { |
783f6184 | 1112 | ret++; |
c05dbfc2 RK |
1113 | } else { |
1114 | sd->cno = simple_strtoull(args[0].from, | |
1115 | NULL, 0); | |
1116 | /* | |
1117 | * No need to see the end pointer; | |
1118 | * match_token() has done syntax | |
1119 | * checking. | |
1120 | */ | |
1121 | if (sd->cno == 0) | |
1122 | ret++; | |
783f6184 RK |
1123 | } |
1124 | } | |
1125 | if (ret) | |
1126 | printk(KERN_ERR | |
1127 | "NILFS: invalid mount option: %s\n", p); | |
1128 | } | |
1129 | if (!options) | |
1130 | break; | |
1131 | BUG_ON(options == data); | |
1132 | *(options - 1) = ','; | |
1133 | } while (!ret); | |
1134 | return ret; | |
1135 | } | |
1136 | ||
1137 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1138 | { | |
f11459ad | 1139 | s->s_bdev = data; |
783f6184 RK |
1140 | s->s_dev = s->s_bdev->bd_dev; |
1141 | return 0; | |
1142 | } | |
1143 | ||
1144 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 | 1145 | { |
f11459ad | 1146 | return (void *)s->s_bdev == data; |
783f6184 RK |
1147 | } |
1148 | ||
e4c59d61 AV |
1149 | static struct dentry * |
1150 | nilfs_mount(struct file_system_type *fs_type, int flags, | |
1151 | const char *dev_name, void *data) | |
783f6184 RK |
1152 | { |
1153 | struct nilfs_super_data sd; | |
33c8e57c | 1154 | struct super_block *s; |
d4d77629 | 1155 | fmode_t mode = FMODE_READ | FMODE_EXCL; |
f11459ad RK |
1156 | struct dentry *root_dentry; |
1157 | int err, s_new = false; | |
783f6184 | 1158 | |
13e90559 RK |
1159 | if (!(flags & MS_RDONLY)) |
1160 | mode |= FMODE_WRITE; | |
1161 | ||
d4d77629 | 1162 | sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type); |
d6d4c19c | 1163 | if (IS_ERR(sd.bdev)) |
e4c59d61 | 1164 | return ERR_CAST(sd.bdev); |
783f6184 | 1165 | |
783f6184 RK |
1166 | sd.cno = 0; |
1167 | sd.flags = flags; | |
1168 | if (nilfs_identify((char *)data, &sd)) { | |
1169 | err = -EINVAL; | |
1170 | goto failed; | |
1171 | } | |
1172 | ||
6dd47406 | 1173 | /* |
5beb6e0b RK |
1174 | * once the super is inserted into the list by sget, s_umount |
1175 | * will protect the lockfs code from trying to start a snapshot | |
1176 | * while we are mounting | |
6dd47406 | 1177 | */ |
5beb6e0b RK |
1178 | mutex_lock(&sd.bdev->bd_fsfreeze_mutex); |
1179 | if (sd.bdev->bd_fsfreeze_count > 0) { | |
1180 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); | |
1181 | err = -EBUSY; | |
1182 | goto failed; | |
1183 | } | |
f11459ad | 1184 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev); |
5beb6e0b | 1185 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); |
33c8e57c RK |
1186 | if (IS_ERR(s)) { |
1187 | err = PTR_ERR(s); | |
348fe8da | 1188 | goto failed; |
783f6184 RK |
1189 | } |
1190 | ||
1191 | if (!s->s_root) { | |
1192 | char b[BDEVNAME_SIZE]; | |
1193 | ||
f11459ad RK |
1194 | s_new = true; |
1195 | ||
33c8e57c | 1196 | /* New superblock instance created */ |
783f6184 | 1197 | s->s_flags = flags; |
4571b82c | 1198 | s->s_mode = mode; |
783f6184 RK |
1199 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); |
1200 | sb_set_blocksize(s, block_size(sd.bdev)); | |
1201 | ||
348fe8da | 1202 | err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
783f6184 | 1203 | if (err) |
348fe8da | 1204 | goto failed_super; |
783f6184 RK |
1205 | |
1206 | s->s_flags |= MS_ACTIVE; | |
f11459ad RK |
1207 | } else if (!sd.cno) { |
1208 | int busy = false; | |
1209 | ||
1210 | if (nilfs_tree_was_touched(s->s_root)) { | |
1211 | busy = nilfs_try_to_shrink_tree(s->s_root); | |
1212 | if (busy && (flags ^ s->s_flags) & MS_RDONLY) { | |
1213 | printk(KERN_ERR "NILFS: the device already " | |
1214 | "has a %s mount.\n", | |
1215 | (s->s_flags & MS_RDONLY) ? | |
1216 | "read-only" : "read/write"); | |
1217 | err = -EBUSY; | |
1218 | goto failed_super; | |
1219 | } | |
1220 | } | |
1221 | if (!busy) { | |
1222 | /* | |
1223 | * Try remount to setup mount states if the current | |
1224 | * tree is not mounted and only snapshots use this sb. | |
1225 | */ | |
1226 | err = nilfs_remount(s, &flags, data); | |
1227 | if (err) | |
1228 | goto failed_super; | |
1229 | } | |
783f6184 RK |
1230 | } |
1231 | ||
f11459ad RK |
1232 | if (sd.cno) { |
1233 | err = nilfs_attach_snapshot(s, sd.cno, &root_dentry); | |
348fe8da | 1234 | if (err) |
f11459ad | 1235 | goto failed_super; |
f11459ad RK |
1236 | } else { |
1237 | root_dentry = dget(s->s_root); | |
783f6184 RK |
1238 | } |
1239 | ||
f11459ad | 1240 | if (!s_new) |
d4d77629 | 1241 | blkdev_put(sd.bdev, mode); |
783f6184 | 1242 | |
e4c59d61 | 1243 | return root_dentry; |
783f6184 | 1244 | |
f11459ad | 1245 | failed_super: |
a95161aa | 1246 | deactivate_locked_super(s); |
783f6184 | 1247 | |
348fe8da RK |
1248 | failed: |
1249 | if (!s_new) | |
d4d77629 | 1250 | blkdev_put(sd.bdev, mode); |
e4c59d61 | 1251 | return ERR_PTR(err); |
783f6184 RK |
1252 | } |
1253 | ||
783f6184 RK |
1254 | struct file_system_type nilfs_fs_type = { |
1255 | .owner = THIS_MODULE, | |
1256 | .name = "nilfs2", | |
e4c59d61 | 1257 | .mount = nilfs_mount, |
783f6184 RK |
1258 | .kill_sb = kill_block_super, |
1259 | .fs_flags = FS_REQUIRES_DEV, | |
1260 | }; | |
1261 | ||
41c88bd7 | 1262 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1263 | { |
41c88bd7 | 1264 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1265 | |
41c88bd7 LH |
1266 | INIT_LIST_HEAD(&ii->i_dirty); |
1267 | #ifdef CONFIG_NILFS_XATTR | |
1268 | init_rwsem(&ii->xattr_sem); | |
1269 | #endif | |
2aa15890 | 1270 | address_space_init_once(&ii->i_btnode_cache); |
05d0e94b | 1271 | ii->i_bmap = &ii->i_bmap_data; |
41c88bd7 LH |
1272 | inode_init_once(&ii->vfs_inode); |
1273 | } | |
783f6184 | 1274 | |
41c88bd7 LH |
1275 | static void nilfs_segbuf_init_once(void *obj) |
1276 | { | |
1277 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1278 | } | |
783f6184 | 1279 | |
41c88bd7 LH |
1280 | static void nilfs_destroy_cachep(void) |
1281 | { | |
84cb0999 | 1282 | if (nilfs_inode_cachep) |
41c88bd7 | 1283 | kmem_cache_destroy(nilfs_inode_cachep); |
84cb0999 | 1284 | if (nilfs_transaction_cachep) |
41c88bd7 | 1285 | kmem_cache_destroy(nilfs_transaction_cachep); |
84cb0999 | 1286 | if (nilfs_segbuf_cachep) |
41c88bd7 | 1287 | kmem_cache_destroy(nilfs_segbuf_cachep); |
84cb0999 | 1288 | if (nilfs_btree_path_cache) |
41c88bd7 LH |
1289 | kmem_cache_destroy(nilfs_btree_path_cache); |
1290 | } | |
783f6184 | 1291 | |
41c88bd7 LH |
1292 | static int __init nilfs_init_cachep(void) |
1293 | { | |
1294 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1295 | sizeof(struct nilfs_inode_info), 0, | |
1296 | SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once); | |
1297 | if (!nilfs_inode_cachep) | |
1298 | goto fail; | |
1299 | ||
1300 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1301 | sizeof(struct nilfs_transaction_info), 0, | |
1302 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1303 | if (!nilfs_transaction_cachep) | |
1304 | goto fail; | |
1305 | ||
1306 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1307 | sizeof(struct nilfs_segment_buffer), 0, | |
1308 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1309 | if (!nilfs_segbuf_cachep) | |
1310 | goto fail; | |
1311 | ||
1312 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1313 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1314 | 0, 0, NULL); | |
1315 | if (!nilfs_btree_path_cache) | |
1316 | goto fail; | |
783f6184 RK |
1317 | |
1318 | return 0; | |
1319 | ||
41c88bd7 LH |
1320 | fail: |
1321 | nilfs_destroy_cachep(); | |
1322 | return -ENOMEM; | |
1323 | } | |
1324 | ||
1325 | static int __init init_nilfs_fs(void) | |
1326 | { | |
1327 | int err; | |
783f6184 | 1328 | |
41c88bd7 LH |
1329 | err = nilfs_init_cachep(); |
1330 | if (err) | |
1331 | goto fail; | |
783f6184 | 1332 | |
41c88bd7 LH |
1333 | err = register_filesystem(&nilfs_fs_type); |
1334 | if (err) | |
1335 | goto free_cachep; | |
783f6184 | 1336 | |
9f130263 | 1337 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1338 | return 0; |
783f6184 | 1339 | |
41c88bd7 LH |
1340 | free_cachep: |
1341 | nilfs_destroy_cachep(); | |
1342 | fail: | |
783f6184 RK |
1343 | return err; |
1344 | } | |
1345 | ||
1346 | static void __exit exit_nilfs_fs(void) | |
1347 | { | |
41c88bd7 | 1348 | nilfs_destroy_cachep(); |
783f6184 RK |
1349 | unregister_filesystem(&nilfs_fs_type); |
1350 | } | |
1351 | ||
1352 | module_init(init_nilfs_fs) | |
1353 | module_exit(exit_nilfs_fs) |