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 | ||
f7545144 | 74 | static int nilfs_setup_super(struct super_block *sb, int is_mount); |
783f6184 | 75 | static int nilfs_remount(struct super_block *sb, int *flags, char *data); |
783f6184 | 76 | |
f7545144 | 77 | static void nilfs_set_error(struct super_block *sb) |
c8a11c8a | 78 | { |
e3154e97 | 79 | struct the_nilfs *nilfs = sb->s_fs_info; |
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; | |
f7545144 | 85 | sbp = nilfs_prepare_super(sb, 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); | |
f7545144 | 90 | nilfs_commit_super(sb, 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 | { | |
e3154e97 | 111 | struct the_nilfs *nilfs = sb->s_fs_info; |
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)) { | |
f7545144 | 126 | nilfs_set_error(sb); |
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 | ||
f7545144 | 191 | static int nilfs_sync_super(struct super_block *sb, int flag) |
783f6184 | 192 | { |
e3154e97 | 193 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 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 | ||
f7545144 | 265 | struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb, |
b2ac86e1 | 266 | int flip) |
783f6184 | 267 | { |
e3154e97 | 268 | struct the_nilfs *nilfs = sb->s_fs_info; |
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 | 277 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", |
f7545144 | 278 | sb->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 | ||
f7545144 | 292 | int nilfs_commit_super(struct super_block *sb, int flag) |
d26493b6 | 293 | { |
e3154e97 | 294 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 JS |
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); |
f7545144 | 314 | return nilfs_sync_super(sb, flag); |
783f6184 RK |
315 | } |
316 | ||
7ecaa46c RK |
317 | /** |
318 | * nilfs_cleanup_super() - write filesystem state for cleanup | |
f7545144 | 319 | * @sb: super block instance to be unmounted or degraded to read-only |
7ecaa46c RK |
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 | */ | |
f7545144 | 325 | int nilfs_cleanup_super(struct super_block *sb) |
7ecaa46c | 326 | { |
e3154e97 | 327 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 328 | struct nilfs_super_block **sbp; |
b2ac86e1 | 329 | int flag = NILFS_SB_COMMIT; |
d26493b6 | 330 | int ret = -EIO; |
7ecaa46c | 331 | |
f7545144 | 332 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 | 333 | if (sbp) { |
f7545144 RK |
334 | sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state); |
335 | nilfs_set_log_cursor(sbp[0], nilfs); | |
b2ac86e1 JS |
336 | if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { |
337 | /* | |
338 | * make the "clean" flag also to the opposite | |
339 | * super block if both super blocks point to | |
340 | * the same checkpoint. | |
341 | */ | |
342 | sbp[1]->s_state = sbp[0]->s_state; | |
343 | flag = NILFS_SB_COMMIT_ALL; | |
344 | } | |
f7545144 | 345 | ret = nilfs_commit_super(sb, flag); |
d26493b6 | 346 | } |
7ecaa46c RK |
347 | return ret; |
348 | } | |
349 | ||
783f6184 RK |
350 | static void nilfs_put_super(struct super_block *sb) |
351 | { | |
e3154e97 | 352 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 353 | |
f7545144 | 354 | nilfs_detach_log_writer(sb); |
783f6184 RK |
355 | |
356 | if (!(sb->s_flags & MS_RDONLY)) { | |
357 | down_write(&nilfs->ns_sem); | |
f7545144 | 358 | nilfs_cleanup_super(sb); |
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 | 367 | sb->s_fs_info = NULL; |
783f6184 RK |
368 | } |
369 | ||
783f6184 RK |
370 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
371 | { | |
e3154e97 | 372 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 373 | struct nilfs_super_block **sbp; |
783f6184 RK |
374 | int err = 0; |
375 | ||
376 | /* This function is called when super block should be written back */ | |
377 | if (wait) | |
378 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
379 | |
380 | down_write(&nilfs->ns_sem); | |
d26493b6 | 381 | if (nilfs_sb_dirty(nilfs)) { |
f7545144 | 382 | sbp = nilfs_prepare_super(sb, nilfs_sb_will_flip(nilfs)); |
b2ac86e1 JS |
383 | if (likely(sbp)) { |
384 | nilfs_set_log_cursor(sbp[0], nilfs); | |
f7545144 | 385 | nilfs_commit_super(sb, NILFS_SB_COMMIT); |
b2ac86e1 | 386 | } |
d26493b6 | 387 | } |
6233caa9 JS |
388 | up_write(&nilfs->ns_sem); |
389 | ||
783f6184 RK |
390 | return err; |
391 | } | |
392 | ||
f7545144 | 393 | int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt, |
4d8d9293 | 394 | struct nilfs_root **rootp) |
783f6184 | 395 | { |
e3154e97 | 396 | struct the_nilfs *nilfs = sb->s_fs_info; |
4d8d9293 | 397 | struct nilfs_root *root; |
783f6184 RK |
398 | struct nilfs_checkpoint *raw_cp; |
399 | struct buffer_head *bh_cp; | |
4d8d9293 | 400 | int err = -ENOMEM; |
783f6184 | 401 | |
4d8d9293 RK |
402 | root = nilfs_find_or_create_root( |
403 | nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); | |
404 | if (!root) | |
405 | return err; | |
783f6184 | 406 | |
e912a5b6 RK |
407 | if (root->ifile) |
408 | goto reuse; /* already attached checkpoint */ | |
783f6184 | 409 | |
1154ecbd | 410 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
411 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
412 | &bh_cp); | |
1154ecbd | 413 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
414 | if (unlikely(err)) { |
415 | if (err == -ENOENT || err == -EINVAL) { | |
416 | printk(KERN_ERR | |
417 | "NILFS: Invalid checkpoint " | |
418 | "(checkpoint number=%llu)\n", | |
419 | (unsigned long long)cno); | |
420 | err = -EINVAL; | |
421 | } | |
422 | goto failed; | |
423 | } | |
f1e89c86 | 424 | |
f7545144 | 425 | err = nilfs_ifile_read(sb, root, nilfs->ns_inode_size, |
f1e89c86 RK |
426 | &raw_cp->cp_ifile_inode, &root->ifile); |
427 | if (err) | |
783f6184 | 428 | goto failed_bh; |
b7c06342 RK |
429 | |
430 | atomic_set(&root->inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); | |
431 | atomic_set(&root->blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); | |
783f6184 RK |
432 | |
433 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
4d8d9293 | 434 | |
e912a5b6 | 435 | reuse: |
4d8d9293 | 436 | *rootp = root; |
783f6184 RK |
437 | return 0; |
438 | ||
439 | failed_bh: | |
440 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
441 | failed: | |
4d8d9293 | 442 | nilfs_put_root(root); |
783f6184 RK |
443 | |
444 | return err; | |
445 | } | |
783f6184 | 446 | |
5beb6e0b RK |
447 | static int nilfs_freeze(struct super_block *sb) |
448 | { | |
e3154e97 | 449 | struct the_nilfs *nilfs = sb->s_fs_info; |
5beb6e0b RK |
450 | int err; |
451 | ||
452 | if (sb->s_flags & MS_RDONLY) | |
453 | return 0; | |
783f6184 | 454 | |
5beb6e0b RK |
455 | /* Mark super block clean */ |
456 | down_write(&nilfs->ns_sem); | |
f7545144 | 457 | err = nilfs_cleanup_super(sb); |
5beb6e0b | 458 | up_write(&nilfs->ns_sem); |
783f6184 RK |
459 | return err; |
460 | } | |
461 | ||
5beb6e0b | 462 | static int nilfs_unfreeze(struct super_block *sb) |
783f6184 | 463 | { |
e3154e97 | 464 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 465 | |
5beb6e0b RK |
466 | if (sb->s_flags & MS_RDONLY) |
467 | return 0; | |
468 | ||
469 | down_write(&nilfs->ns_sem); | |
f7545144 | 470 | nilfs_setup_super(sb, false); |
5beb6e0b RK |
471 | up_write(&nilfs->ns_sem); |
472 | return 0; | |
783f6184 RK |
473 | } |
474 | ||
783f6184 RK |
475 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
476 | { | |
477 | struct super_block *sb = dentry->d_sb; | |
b7c06342 RK |
478 | struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root; |
479 | struct the_nilfs *nilfs = root->nilfs; | |
c306af23 | 480 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
783f6184 RK |
481 | unsigned long long blocks; |
482 | unsigned long overhead; | |
483 | unsigned long nrsvblocks; | |
484 | sector_t nfreeblocks; | |
783f6184 RK |
485 | int err; |
486 | ||
487 | /* | |
488 | * Compute all of the segment blocks | |
489 | * | |
490 | * The blocks before first segment and after last segment | |
491 | * are excluded. | |
492 | */ | |
493 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
494 | - nilfs->ns_first_data_block; | |
495 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
496 | ||
497 | /* | |
498 | * Compute the overhead | |
499 | * | |
7a65004b | 500 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
501 | * We must count them as the overhead. |
502 | */ | |
503 | overhead = 0; | |
504 | ||
505 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
506 | if (unlikely(err)) | |
507 | return err; | |
508 | ||
509 | buf->f_type = NILFS_SUPER_MAGIC; | |
510 | buf->f_bsize = sb->s_blocksize; | |
511 | buf->f_blocks = blocks - overhead; | |
512 | buf->f_bfree = nfreeblocks; | |
513 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
514 | (buf->f_bfree - nrsvblocks) : 0; | |
b7c06342 | 515 | buf->f_files = atomic_read(&root->inodes_count); |
783f6184 RK |
516 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ |
517 | buf->f_namelen = NILFS_NAME_LEN; | |
c306af23 RK |
518 | buf->f_fsid.val[0] = (u32)id; |
519 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
520 | ||
783f6184 RK |
521 | return 0; |
522 | } | |
523 | ||
b58a285b JS |
524 | static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
525 | { | |
526 | struct super_block *sb = vfs->mnt_sb; | |
e3154e97 | 527 | struct the_nilfs *nilfs = sb->s_fs_info; |
f11459ad | 528 | struct nilfs_root *root = NILFS_I(vfs->mnt_root->d_inode)->i_root; |
b58a285b | 529 | |
3b2ce58b | 530 | if (!nilfs_test_opt(nilfs, BARRIER)) |
c6b4d57d | 531 | seq_puts(seq, ",nobarrier"); |
f11459ad RK |
532 | if (root->cno != NILFS_CPTREE_CURRENT_CNO) |
533 | seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno); | |
3b2ce58b | 534 | if (nilfs_test_opt(nilfs, ERRORS_PANIC)) |
c6b4d57d | 535 | seq_puts(seq, ",errors=panic"); |
3b2ce58b | 536 | if (nilfs_test_opt(nilfs, ERRORS_CONT)) |
c6b4d57d | 537 | seq_puts(seq, ",errors=continue"); |
3b2ce58b | 538 | if (nilfs_test_opt(nilfs, STRICT_ORDER)) |
c6b4d57d | 539 | seq_puts(seq, ",order=strict"); |
3b2ce58b | 540 | if (nilfs_test_opt(nilfs, NORECOVERY)) |
c6b4d57d | 541 | seq_puts(seq, ",norecovery"); |
3b2ce58b | 542 | if (nilfs_test_opt(nilfs, DISCARD)) |
c6b4d57d | 543 | seq_puts(seq, ",discard"); |
b58a285b JS |
544 | |
545 | return 0; | |
546 | } | |
547 | ||
b87221de | 548 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
549 | .alloc_inode = nilfs_alloc_inode, |
550 | .destroy_inode = nilfs_destroy_inode, | |
551 | .dirty_inode = nilfs_dirty_inode, | |
552 | /* .write_inode = nilfs_write_inode, */ | |
553 | /* .put_inode = nilfs_put_inode, */ | |
554 | /* .drop_inode = nilfs_drop_inode, */ | |
6fd1e5c9 | 555 | .evict_inode = nilfs_evict_inode, |
783f6184 | 556 | .put_super = nilfs_put_super, |
1dfa2710 | 557 | /* .write_super = nilfs_write_super, */ |
783f6184 | 558 | .sync_fs = nilfs_sync_fs, |
5beb6e0b RK |
559 | .freeze_fs = nilfs_freeze, |
560 | .unfreeze_fs = nilfs_unfreeze, | |
783f6184 RK |
561 | /* .write_super_lockfs */ |
562 | /* .unlockfs */ | |
563 | .statfs = nilfs_statfs, | |
564 | .remount_fs = nilfs_remount, | |
783f6184 | 565 | /* .umount_begin */ |
b58a285b | 566 | .show_options = nilfs_show_options |
783f6184 RK |
567 | }; |
568 | ||
783f6184 RK |
569 | enum { |
570 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
773bc4f3 | 571 | Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
802d3177 | 572 | Opt_discard, Opt_nodiscard, Opt_err, |
783f6184 RK |
573 | }; |
574 | ||
575 | static match_table_t tokens = { | |
576 | {Opt_err_cont, "errors=continue"}, | |
577 | {Opt_err_panic, "errors=panic"}, | |
578 | {Opt_err_ro, "errors=remount-ro"}, | |
773bc4f3 | 579 | {Opt_barrier, "barrier"}, |
91f1953b | 580 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
581 | {Opt_snapshot, "cp=%u"}, |
582 | {Opt_order, "order=%s"}, | |
0234576d | 583 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 584 | {Opt_discard, "discard"}, |
802d3177 | 585 | {Opt_nodiscard, "nodiscard"}, |
783f6184 RK |
586 | {Opt_err, NULL} |
587 | }; | |
588 | ||
7c017457 | 589 | static int parse_options(char *options, struct super_block *sb, int is_remount) |
783f6184 | 590 | { |
e3154e97 | 591 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 RK |
592 | char *p; |
593 | substring_t args[MAX_OPT_ARGS]; | |
783f6184 RK |
594 | |
595 | if (!options) | |
596 | return 1; | |
597 | ||
598 | while ((p = strsep(&options, ",")) != NULL) { | |
599 | int token; | |
600 | if (!*p) | |
601 | continue; | |
602 | ||
603 | token = match_token(p, tokens, args); | |
604 | switch (token) { | |
773bc4f3 | 605 | case Opt_barrier: |
3b2ce58b | 606 | nilfs_set_opt(nilfs, BARRIER); |
773bc4f3 | 607 | break; |
91f1953b | 608 | case Opt_nobarrier: |
3b2ce58b | 609 | nilfs_clear_opt(nilfs, BARRIER); |
783f6184 RK |
610 | break; |
611 | case Opt_order: | |
612 | if (strcmp(args[0].from, "relaxed") == 0) | |
613 | /* Ordered data semantics */ | |
3b2ce58b | 614 | nilfs_clear_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
615 | else if (strcmp(args[0].from, "strict") == 0) |
616 | /* Strict in-order semantics */ | |
3b2ce58b | 617 | nilfs_set_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
618 | else |
619 | return 0; | |
620 | break; | |
621 | case Opt_err_panic: | |
3b2ce58b | 622 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC); |
783f6184 RK |
623 | break; |
624 | case Opt_err_ro: | |
3b2ce58b | 625 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO); |
783f6184 RK |
626 | break; |
627 | case Opt_err_cont: | |
3b2ce58b | 628 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT); |
783f6184 RK |
629 | break; |
630 | case Opt_snapshot: | |
7c017457 | 631 | if (is_remount) { |
f11459ad RK |
632 | printk(KERN_ERR |
633 | "NILFS: \"%s\" option is invalid " | |
634 | "for remount.\n", p); | |
783f6184 | 635 | return 0; |
7c017457 | 636 | } |
783f6184 | 637 | break; |
0234576d | 638 | case Opt_norecovery: |
3b2ce58b | 639 | nilfs_set_opt(nilfs, NORECOVERY); |
0234576d | 640 | break; |
e902ec99 | 641 | case Opt_discard: |
3b2ce58b | 642 | nilfs_set_opt(nilfs, DISCARD); |
e902ec99 | 643 | break; |
802d3177 | 644 | case Opt_nodiscard: |
3b2ce58b | 645 | nilfs_clear_opt(nilfs, DISCARD); |
802d3177 | 646 | break; |
783f6184 RK |
647 | default: |
648 | printk(KERN_ERR | |
649 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
650 | return 0; | |
651 | } | |
652 | } | |
653 | return 1; | |
654 | } | |
655 | ||
656 | static inline void | |
3b2ce58b | 657 | nilfs_set_default_options(struct super_block *sb, |
783f6184 RK |
658 | struct nilfs_super_block *sbp) |
659 | { | |
e3154e97 | 660 | struct the_nilfs *nilfs = sb->s_fs_info; |
3b2ce58b RK |
661 | |
662 | nilfs->ns_mount_opt = | |
277a6a34 | 663 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
664 | } |
665 | ||
f7545144 | 666 | static int nilfs_setup_super(struct super_block *sb, int is_mount) |
783f6184 | 667 | { |
e3154e97 | 668 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 JS |
669 | struct nilfs_super_block **sbp; |
670 | int max_mnt_count; | |
671 | int mnt_count; | |
672 | ||
673 | /* nilfs->ns_sem must be locked by the caller. */ | |
f7545144 | 674 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 JS |
675 | if (!sbp) |
676 | return -EIO; | |
677 | ||
5beb6e0b RK |
678 | if (!is_mount) |
679 | goto skip_mount_setup; | |
680 | ||
d26493b6 JS |
681 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); |
682 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); | |
783f6184 | 683 | |
f50a4c81 | 684 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
783f6184 RK |
685 | printk(KERN_WARNING |
686 | "NILFS warning: mounting fs with errors\n"); | |
687 | #if 0 | |
688 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
689 | printk(KERN_WARNING | |
690 | "NILFS warning: maximal mount count reached\n"); | |
691 | #endif | |
692 | } | |
693 | if (!max_mnt_count) | |
d26493b6 | 694 | sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
783f6184 | 695 | |
d26493b6 | 696 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
5beb6e0b RK |
697 | sbp[0]->s_mtime = cpu_to_le64(get_seconds()); |
698 | ||
699 | skip_mount_setup: | |
d26493b6 JS |
700 | sbp[0]->s_state = |
701 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); | |
b2ac86e1 | 702 | /* synchronize sbp[1] with sbp[0] */ |
0ca7a5b9 RK |
703 | if (sbp[1]) |
704 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
f7545144 | 705 | return nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); |
783f6184 RK |
706 | } |
707 | ||
e339ad31 RK |
708 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
709 | u64 pos, int blocksize, | |
710 | struct buffer_head **pbh) | |
783f6184 | 711 | { |
e339ad31 RK |
712 | unsigned long long sb_index = pos; |
713 | unsigned long offset; | |
783f6184 | 714 | |
e339ad31 | 715 | offset = do_div(sb_index, blocksize); |
783f6184 | 716 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 717 | if (!*pbh) |
783f6184 | 718 | return NULL; |
783f6184 RK |
719 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
720 | } | |
721 | ||
783f6184 RK |
722 | int nilfs_store_magic_and_option(struct super_block *sb, |
723 | struct nilfs_super_block *sbp, | |
724 | char *data) | |
725 | { | |
e3154e97 | 726 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 727 | |
783f6184 RK |
728 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
729 | ||
730 | /* FS independent flags */ | |
731 | #ifdef NILFS_ATIME_DISABLE | |
732 | sb->s_flags |= MS_NOATIME; | |
733 | #endif | |
734 | ||
3b2ce58b | 735 | nilfs_set_default_options(sb, sbp); |
783f6184 | 736 | |
574e6c31 RK |
737 | nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid); |
738 | nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid); | |
739 | nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval); | |
740 | nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max); | |
783f6184 | 741 | |
7c017457 | 742 | return !parse_options(data, sb, 0) ? -EINVAL : 0 ; |
783f6184 RK |
743 | } |
744 | ||
c5ca48aa RK |
745 | int nilfs_check_feature_compatibility(struct super_block *sb, |
746 | struct nilfs_super_block *sbp) | |
747 | { | |
748 | __u64 features; | |
749 | ||
750 | features = le64_to_cpu(sbp->s_feature_incompat) & | |
751 | ~NILFS_FEATURE_INCOMPAT_SUPP; | |
752 | if (features) { | |
753 | printk(KERN_ERR "NILFS: couldn't mount because of unsupported " | |
754 | "optional features (%llx)\n", | |
755 | (unsigned long long)features); | |
756 | return -EINVAL; | |
757 | } | |
758 | features = le64_to_cpu(sbp->s_feature_compat_ro) & | |
759 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
760 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
761 | printk(KERN_ERR "NILFS: couldn't mount RDWR because of " | |
762 | "unsupported optional features (%llx)\n", | |
763 | (unsigned long long)features); | |
764 | return -EINVAL; | |
765 | } | |
766 | return 0; | |
767 | } | |
768 | ||
367ea334 RK |
769 | static int nilfs_get_root_dentry(struct super_block *sb, |
770 | struct nilfs_root *root, | |
771 | struct dentry **root_dentry) | |
772 | { | |
773 | struct inode *inode; | |
774 | struct dentry *dentry; | |
775 | int ret = 0; | |
776 | ||
777 | inode = nilfs_iget(sb, root, NILFS_ROOT_INO); | |
778 | if (IS_ERR(inode)) { | |
779 | printk(KERN_ERR "NILFS: get root inode failed\n"); | |
780 | ret = PTR_ERR(inode); | |
781 | goto out; | |
782 | } | |
783 | if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { | |
784 | iput(inode); | |
785 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); | |
786 | ret = -EINVAL; | |
787 | goto out; | |
788 | } | |
789 | ||
f11459ad RK |
790 | if (root->cno == NILFS_CPTREE_CURRENT_CNO) { |
791 | dentry = d_find_alias(inode); | |
792 | if (!dentry) { | |
793 | dentry = d_alloc_root(inode); | |
794 | if (!dentry) { | |
795 | iput(inode); | |
796 | ret = -ENOMEM; | |
797 | goto failed_dentry; | |
798 | } | |
799 | } else { | |
800 | iput(inode); | |
801 | } | |
802 | } else { | |
803 | dentry = d_obtain_alias(inode); | |
804 | if (IS_ERR(dentry)) { | |
805 | ret = PTR_ERR(dentry); | |
806 | goto failed_dentry; | |
807 | } | |
367ea334 RK |
808 | } |
809 | *root_dentry = dentry; | |
810 | out: | |
811 | return ret; | |
f11459ad RK |
812 | |
813 | failed_dentry: | |
814 | printk(KERN_ERR "NILFS: get root dentry failed\n"); | |
815 | goto out; | |
367ea334 RK |
816 | } |
817 | ||
ab4d8f7e RK |
818 | static int nilfs_attach_snapshot(struct super_block *s, __u64 cno, |
819 | struct dentry **root_dentry) | |
820 | { | |
e3154e97 | 821 | struct the_nilfs *nilfs = s->s_fs_info; |
ab4d8f7e RK |
822 | struct nilfs_root *root; |
823 | int ret; | |
824 | ||
825 | down_read(&nilfs->ns_segctor_sem); | |
826 | ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno); | |
827 | up_read(&nilfs->ns_segctor_sem); | |
828 | if (ret < 0) { | |
829 | ret = (ret == -ENOENT) ? -EINVAL : ret; | |
830 | goto out; | |
831 | } else if (!ret) { | |
832 | printk(KERN_ERR "NILFS: The specified checkpoint is " | |
833 | "not a snapshot (checkpoint number=%llu).\n", | |
834 | (unsigned long long)cno); | |
835 | ret = -EINVAL; | |
836 | goto out; | |
837 | } | |
838 | ||
f7545144 | 839 | ret = nilfs_attach_checkpoint(s, cno, false, &root); |
ab4d8f7e RK |
840 | if (ret) { |
841 | printk(KERN_ERR "NILFS: error loading snapshot " | |
842 | "(checkpoint number=%llu).\n", | |
843 | (unsigned long long)cno); | |
844 | goto out; | |
845 | } | |
846 | ret = nilfs_get_root_dentry(s, root, root_dentry); | |
847 | nilfs_put_root(root); | |
848 | out: | |
849 | return ret; | |
850 | } | |
851 | ||
f11459ad RK |
852 | static int nilfs_tree_was_touched(struct dentry *root_dentry) |
853 | { | |
b7ab39f6 | 854 | return root_dentry->d_count > 1; |
f11459ad RK |
855 | } |
856 | ||
857 | /** | |
858 | * nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint | |
859 | * @root_dentry: root dentry of the tree to be shrunk | |
860 | * | |
861 | * This function returns true if the tree was in-use. | |
862 | */ | |
863 | static int nilfs_try_to_shrink_tree(struct dentry *root_dentry) | |
864 | { | |
865 | if (have_submounts(root_dentry)) | |
866 | return true; | |
867 | shrink_dcache_parent(root_dentry); | |
868 | return nilfs_tree_was_touched(root_dentry); | |
869 | } | |
870 | ||
032dbb3b RK |
871 | int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno) |
872 | { | |
e3154e97 | 873 | struct the_nilfs *nilfs = sb->s_fs_info; |
032dbb3b RK |
874 | struct nilfs_root *root; |
875 | struct inode *inode; | |
876 | struct dentry *dentry; | |
877 | int ret; | |
878 | ||
879 | if (cno < 0 || cno > nilfs->ns_cno) | |
880 | return false; | |
881 | ||
882 | if (cno >= nilfs_last_cno(nilfs)) | |
883 | return true; /* protect recent checkpoints */ | |
884 | ||
885 | ret = false; | |
e3154e97 | 886 | root = nilfs_lookup_root(nilfs, cno); |
032dbb3b RK |
887 | if (root) { |
888 | inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO); | |
889 | if (inode) { | |
890 | dentry = d_find_alias(inode); | |
891 | if (dentry) { | |
892 | if (nilfs_tree_was_touched(dentry)) | |
893 | ret = nilfs_try_to_shrink_tree(dentry); | |
894 | dput(dentry); | |
895 | } | |
896 | iput(inode); | |
897 | } | |
898 | nilfs_put_root(root); | |
899 | } | |
900 | return ret; | |
901 | } | |
902 | ||
783f6184 RK |
903 | /** |
904 | * nilfs_fill_super() - initialize a super block instance | |
905 | * @sb: super_block | |
906 | * @data: mount options | |
907 | * @silent: silent mode flag | |
783f6184 | 908 | * |
aa7dfb89 | 909 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
910 | * So, the recovery process is protected from other simultaneous mounts. |
911 | */ | |
912 | static int | |
348fe8da | 913 | nilfs_fill_super(struct super_block *sb, void *data, int silent) |
783f6184 | 914 | { |
348fe8da | 915 | struct the_nilfs *nilfs; |
4d8d9293 | 916 | struct nilfs_root *fsroot; |
026a7d63 | 917 | struct backing_dev_info *bdi; |
783f6184 RK |
918 | __u64 cno; |
919 | int err; | |
920 | ||
e3154e97 RK |
921 | nilfs = alloc_nilfs(sb->s_bdev); |
922 | if (!nilfs) | |
783f6184 RK |
923 | return -ENOMEM; |
924 | ||
e3154e97 | 925 | sb->s_fs_info = nilfs; |
783f6184 | 926 | |
f7545144 | 927 | err = init_nilfs(nilfs, sb, (char *)data); |
783f6184 | 928 | if (err) |
348fe8da | 929 | goto failed_nilfs; |
783f6184 | 930 | |
783f6184 RK |
931 | sb->s_op = &nilfs_sops; |
932 | sb->s_export_op = &nilfs_export_ops; | |
933 | sb->s_root = NULL; | |
61239230 | 934 | sb->s_time_gran = 1; |
026a7d63 RK |
935 | |
936 | bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info; | |
937 | sb->s_bdi = bdi ? : &default_backing_dev_info; | |
783f6184 | 938 | |
f7545144 | 939 | err = load_nilfs(nilfs, sb); |
f50a4c81 | 940 | if (err) |
348fe8da | 941 | goto failed_nilfs; |
f50a4c81 | 942 | |
783f6184 | 943 | cno = nilfs_last_cno(nilfs); |
f7545144 | 944 | err = nilfs_attach_checkpoint(sb, cno, true, &fsroot); |
783f6184 | 945 | if (err) { |
f11459ad RK |
946 | printk(KERN_ERR "NILFS: error loading last checkpoint " |
947 | "(checkpoint number=%llu).\n", (unsigned long long)cno); | |
f1e89c86 | 948 | goto failed_unload; |
783f6184 RK |
949 | } |
950 | ||
951 | if (!(sb->s_flags & MS_RDONLY)) { | |
f7545144 | 952 | err = nilfs_attach_log_writer(sb, fsroot); |
783f6184 RK |
953 | if (err) |
954 | goto failed_checkpoint; | |
955 | } | |
956 | ||
367ea334 RK |
957 | err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root); |
958 | if (err) | |
783f6184 | 959 | goto failed_segctor; |
783f6184 | 960 | |
4d8d9293 | 961 | nilfs_put_root(fsroot); |
783f6184 RK |
962 | |
963 | if (!(sb->s_flags & MS_RDONLY)) { | |
964 | down_write(&nilfs->ns_sem); | |
f7545144 | 965 | nilfs_setup_super(sb, true); |
783f6184 RK |
966 | up_write(&nilfs->ns_sem); |
967 | } | |
968 | ||
783f6184 RK |
969 | return 0; |
970 | ||
783f6184 | 971 | failed_segctor: |
f7545144 | 972 | nilfs_detach_log_writer(sb); |
783f6184 RK |
973 | |
974 | failed_checkpoint: | |
4d8d9293 | 975 | nilfs_put_root(fsroot); |
783f6184 | 976 | |
f1e89c86 RK |
977 | failed_unload: |
978 | iput(nilfs->ns_sufile); | |
979 | iput(nilfs->ns_cpfile); | |
980 | iput(nilfs->ns_dat); | |
981 | ||
348fe8da RK |
982 | failed_nilfs: |
983 | destroy_nilfs(nilfs); | |
783f6184 RK |
984 | return err; |
985 | } | |
986 | ||
987 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
988 | { | |
e3154e97 | 989 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 990 | unsigned long old_sb_flags; |
06df0f99 | 991 | unsigned long old_mount_opt; |
f11459ad | 992 | int err; |
783f6184 RK |
993 | |
994 | old_sb_flags = sb->s_flags; | |
3b2ce58b | 995 | old_mount_opt = nilfs->ns_mount_opt; |
783f6184 | 996 | |
7c017457 | 997 | if (!parse_options(data, sb, 1)) { |
783f6184 RK |
998 | err = -EINVAL; |
999 | goto restore_opts; | |
1000 | } | |
1001 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); | |
1002 | ||
d240e067 | 1003 | err = -EINVAL; |
783f6184 | 1004 | |
0234576d RK |
1005 | if (!nilfs_valid_fs(nilfs)) { |
1006 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1007 | "remount because the filesystem is in an " | |
1008 | "incomplete recovery state.\n", sb->s_id); | |
0234576d RK |
1009 | goto restore_opts; |
1010 | } | |
1011 | ||
783f6184 RK |
1012 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
1013 | goto out; | |
1014 | if (*flags & MS_RDONLY) { | |
f7545144 RK |
1015 | /* Shutting down log writer */ |
1016 | nilfs_detach_log_writer(sb); | |
783f6184 RK |
1017 | sb->s_flags |= MS_RDONLY; |
1018 | ||
783f6184 RK |
1019 | /* |
1020 | * Remounting a valid RW partition RDONLY, so set | |
1021 | * the RDONLY flag and then mark the partition as valid again. | |
1022 | */ | |
1023 | down_write(&nilfs->ns_sem); | |
f7545144 | 1024 | nilfs_cleanup_super(sb); |
783f6184 RK |
1025 | up_write(&nilfs->ns_sem); |
1026 | } else { | |
c5ca48aa | 1027 | __u64 features; |
e912a5b6 | 1028 | struct nilfs_root *root; |
c5ca48aa | 1029 | |
783f6184 RK |
1030 | /* |
1031 | * Mounting a RDONLY partition read-write, so reread and | |
1032 | * store the current valid flag. (It may have been changed | |
1033 | * by fsck since we originally mounted the partition.) | |
1034 | */ | |
c5ca48aa RK |
1035 | down_read(&nilfs->ns_sem); |
1036 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & | |
1037 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
1038 | up_read(&nilfs->ns_sem); | |
1039 | if (features) { | |
1040 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1041 | "remount RDWR because of unsupported optional " | |
1042 | "features (%llx)\n", | |
1043 | sb->s_id, (unsigned long long)features); | |
1044 | err = -EROFS; | |
1045 | goto restore_opts; | |
1046 | } | |
1047 | ||
783f6184 | 1048 | sb->s_flags &= ~MS_RDONLY; |
783f6184 | 1049 | |
e912a5b6 | 1050 | root = NILFS_I(sb->s_root->d_inode)->i_root; |
f7545144 | 1051 | err = nilfs_attach_log_writer(sb, root); |
783f6184 | 1052 | if (err) |
e59399d0 | 1053 | goto restore_opts; |
783f6184 RK |
1054 | |
1055 | down_write(&nilfs->ns_sem); | |
f7545144 | 1056 | nilfs_setup_super(sb, true); |
783f6184 | 1057 | up_write(&nilfs->ns_sem); |
783f6184 RK |
1058 | } |
1059 | out: | |
1060 | return 0; | |
1061 | ||
783f6184 RK |
1062 | restore_opts: |
1063 | sb->s_flags = old_sb_flags; | |
3b2ce58b | 1064 | nilfs->ns_mount_opt = old_mount_opt; |
783f6184 RK |
1065 | return err; |
1066 | } | |
1067 | ||
1068 | struct nilfs_super_data { | |
1069 | struct block_device *bdev; | |
1070 | __u64 cno; | |
1071 | int flags; | |
1072 | }; | |
1073 | ||
1074 | /** | |
1075 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
1076 | * @data: mount options | |
1077 | * @sd: nilfs_super_data | |
1078 | */ | |
1079 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
1080 | { | |
1081 | char *p, *options = data; | |
1082 | substring_t args[MAX_OPT_ARGS]; | |
c05dbfc2 | 1083 | int token; |
783f6184 RK |
1084 | int ret = 0; |
1085 | ||
1086 | do { | |
1087 | p = strsep(&options, ","); | |
1088 | if (p != NULL && *p) { | |
1089 | token = match_token(p, tokens, args); | |
1090 | if (token == Opt_snapshot) { | |
c05dbfc2 | 1091 | if (!(sd->flags & MS_RDONLY)) { |
783f6184 | 1092 | ret++; |
c05dbfc2 RK |
1093 | } else { |
1094 | sd->cno = simple_strtoull(args[0].from, | |
1095 | NULL, 0); | |
1096 | /* | |
1097 | * No need to see the end pointer; | |
1098 | * match_token() has done syntax | |
1099 | * checking. | |
1100 | */ | |
1101 | if (sd->cno == 0) | |
1102 | ret++; | |
783f6184 RK |
1103 | } |
1104 | } | |
1105 | if (ret) | |
1106 | printk(KERN_ERR | |
1107 | "NILFS: invalid mount option: %s\n", p); | |
1108 | } | |
1109 | if (!options) | |
1110 | break; | |
1111 | BUG_ON(options == data); | |
1112 | *(options - 1) = ','; | |
1113 | } while (!ret); | |
1114 | return ret; | |
1115 | } | |
1116 | ||
1117 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1118 | { | |
f11459ad | 1119 | s->s_bdev = data; |
783f6184 RK |
1120 | s->s_dev = s->s_bdev->bd_dev; |
1121 | return 0; | |
1122 | } | |
1123 | ||
1124 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 | 1125 | { |
f11459ad | 1126 | return (void *)s->s_bdev == data; |
783f6184 RK |
1127 | } |
1128 | ||
e4c59d61 AV |
1129 | static struct dentry * |
1130 | nilfs_mount(struct file_system_type *fs_type, int flags, | |
1131 | const char *dev_name, void *data) | |
783f6184 RK |
1132 | { |
1133 | struct nilfs_super_data sd; | |
33c8e57c | 1134 | struct super_block *s; |
d4d77629 | 1135 | fmode_t mode = FMODE_READ | FMODE_EXCL; |
f11459ad RK |
1136 | struct dentry *root_dentry; |
1137 | int err, s_new = false; | |
783f6184 | 1138 | |
13e90559 RK |
1139 | if (!(flags & MS_RDONLY)) |
1140 | mode |= FMODE_WRITE; | |
1141 | ||
d4d77629 | 1142 | sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type); |
d6d4c19c | 1143 | if (IS_ERR(sd.bdev)) |
e4c59d61 | 1144 | return ERR_CAST(sd.bdev); |
783f6184 | 1145 | |
783f6184 RK |
1146 | sd.cno = 0; |
1147 | sd.flags = flags; | |
1148 | if (nilfs_identify((char *)data, &sd)) { | |
1149 | err = -EINVAL; | |
1150 | goto failed; | |
1151 | } | |
1152 | ||
6dd47406 | 1153 | /* |
5beb6e0b RK |
1154 | * once the super is inserted into the list by sget, s_umount |
1155 | * will protect the lockfs code from trying to start a snapshot | |
1156 | * while we are mounting | |
6dd47406 | 1157 | */ |
5beb6e0b RK |
1158 | mutex_lock(&sd.bdev->bd_fsfreeze_mutex); |
1159 | if (sd.bdev->bd_fsfreeze_count > 0) { | |
1160 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); | |
1161 | err = -EBUSY; | |
1162 | goto failed; | |
1163 | } | |
f11459ad | 1164 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev); |
5beb6e0b | 1165 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); |
33c8e57c RK |
1166 | if (IS_ERR(s)) { |
1167 | err = PTR_ERR(s); | |
348fe8da | 1168 | goto failed; |
783f6184 RK |
1169 | } |
1170 | ||
1171 | if (!s->s_root) { | |
1172 | char b[BDEVNAME_SIZE]; | |
1173 | ||
f11459ad RK |
1174 | s_new = true; |
1175 | ||
33c8e57c | 1176 | /* New superblock instance created */ |
783f6184 | 1177 | s->s_flags = flags; |
4571b82c | 1178 | s->s_mode = mode; |
783f6184 RK |
1179 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); |
1180 | sb_set_blocksize(s, block_size(sd.bdev)); | |
1181 | ||
348fe8da | 1182 | err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
783f6184 | 1183 | if (err) |
348fe8da | 1184 | goto failed_super; |
783f6184 RK |
1185 | |
1186 | s->s_flags |= MS_ACTIVE; | |
f11459ad RK |
1187 | } else if (!sd.cno) { |
1188 | int busy = false; | |
1189 | ||
1190 | if (nilfs_tree_was_touched(s->s_root)) { | |
1191 | busy = nilfs_try_to_shrink_tree(s->s_root); | |
1192 | if (busy && (flags ^ s->s_flags) & MS_RDONLY) { | |
1193 | printk(KERN_ERR "NILFS: the device already " | |
1194 | "has a %s mount.\n", | |
1195 | (s->s_flags & MS_RDONLY) ? | |
1196 | "read-only" : "read/write"); | |
1197 | err = -EBUSY; | |
1198 | goto failed_super; | |
1199 | } | |
1200 | } | |
1201 | if (!busy) { | |
1202 | /* | |
1203 | * Try remount to setup mount states if the current | |
1204 | * tree is not mounted and only snapshots use this sb. | |
1205 | */ | |
1206 | err = nilfs_remount(s, &flags, data); | |
1207 | if (err) | |
1208 | goto failed_super; | |
1209 | } | |
783f6184 RK |
1210 | } |
1211 | ||
f11459ad RK |
1212 | if (sd.cno) { |
1213 | err = nilfs_attach_snapshot(s, sd.cno, &root_dentry); | |
348fe8da | 1214 | if (err) |
f11459ad | 1215 | goto failed_super; |
f11459ad RK |
1216 | } else { |
1217 | root_dentry = dget(s->s_root); | |
783f6184 RK |
1218 | } |
1219 | ||
f11459ad | 1220 | if (!s_new) |
d4d77629 | 1221 | blkdev_put(sd.bdev, mode); |
783f6184 | 1222 | |
e4c59d61 | 1223 | return root_dentry; |
783f6184 | 1224 | |
f11459ad | 1225 | failed_super: |
a95161aa | 1226 | deactivate_locked_super(s); |
783f6184 | 1227 | |
348fe8da RK |
1228 | failed: |
1229 | if (!s_new) | |
d4d77629 | 1230 | blkdev_put(sd.bdev, mode); |
e4c59d61 | 1231 | return ERR_PTR(err); |
783f6184 RK |
1232 | } |
1233 | ||
783f6184 RK |
1234 | struct file_system_type nilfs_fs_type = { |
1235 | .owner = THIS_MODULE, | |
1236 | .name = "nilfs2", | |
e4c59d61 | 1237 | .mount = nilfs_mount, |
783f6184 RK |
1238 | .kill_sb = kill_block_super, |
1239 | .fs_flags = FS_REQUIRES_DEV, | |
1240 | }; | |
1241 | ||
41c88bd7 | 1242 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1243 | { |
41c88bd7 | 1244 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1245 | |
41c88bd7 LH |
1246 | INIT_LIST_HEAD(&ii->i_dirty); |
1247 | #ifdef CONFIG_NILFS_XATTR | |
1248 | init_rwsem(&ii->xattr_sem); | |
1249 | #endif | |
2aa15890 | 1250 | address_space_init_once(&ii->i_btnode_cache); |
05d0e94b | 1251 | ii->i_bmap = &ii->i_bmap_data; |
41c88bd7 LH |
1252 | inode_init_once(&ii->vfs_inode); |
1253 | } | |
783f6184 | 1254 | |
41c88bd7 LH |
1255 | static void nilfs_segbuf_init_once(void *obj) |
1256 | { | |
1257 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1258 | } | |
783f6184 | 1259 | |
41c88bd7 LH |
1260 | static void nilfs_destroy_cachep(void) |
1261 | { | |
84cb0999 | 1262 | if (nilfs_inode_cachep) |
41c88bd7 | 1263 | kmem_cache_destroy(nilfs_inode_cachep); |
84cb0999 | 1264 | if (nilfs_transaction_cachep) |
41c88bd7 | 1265 | kmem_cache_destroy(nilfs_transaction_cachep); |
84cb0999 | 1266 | if (nilfs_segbuf_cachep) |
41c88bd7 | 1267 | kmem_cache_destroy(nilfs_segbuf_cachep); |
84cb0999 | 1268 | if (nilfs_btree_path_cache) |
41c88bd7 LH |
1269 | kmem_cache_destroy(nilfs_btree_path_cache); |
1270 | } | |
783f6184 | 1271 | |
41c88bd7 LH |
1272 | static int __init nilfs_init_cachep(void) |
1273 | { | |
1274 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1275 | sizeof(struct nilfs_inode_info), 0, | |
1276 | SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once); | |
1277 | if (!nilfs_inode_cachep) | |
1278 | goto fail; | |
1279 | ||
1280 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1281 | sizeof(struct nilfs_transaction_info), 0, | |
1282 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1283 | if (!nilfs_transaction_cachep) | |
1284 | goto fail; | |
1285 | ||
1286 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1287 | sizeof(struct nilfs_segment_buffer), 0, | |
1288 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1289 | if (!nilfs_segbuf_cachep) | |
1290 | goto fail; | |
1291 | ||
1292 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1293 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1294 | 0, 0, NULL); | |
1295 | if (!nilfs_btree_path_cache) | |
1296 | goto fail; | |
783f6184 RK |
1297 | |
1298 | return 0; | |
1299 | ||
41c88bd7 LH |
1300 | fail: |
1301 | nilfs_destroy_cachep(); | |
1302 | return -ENOMEM; | |
1303 | } | |
1304 | ||
1305 | static int __init init_nilfs_fs(void) | |
1306 | { | |
1307 | int err; | |
783f6184 | 1308 | |
41c88bd7 LH |
1309 | err = nilfs_init_cachep(); |
1310 | if (err) | |
1311 | goto fail; | |
783f6184 | 1312 | |
41c88bd7 LH |
1313 | err = register_filesystem(&nilfs_fs_type); |
1314 | if (err) | |
1315 | goto free_cachep; | |
783f6184 | 1316 | |
9f130263 | 1317 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1318 | return 0; |
783f6184 | 1319 | |
41c88bd7 LH |
1320 | free_cachep: |
1321 | nilfs_destroy_cachep(); | |
1322 | fail: | |
783f6184 RK |
1323 | return err; |
1324 | } | |
1325 | ||
1326 | static void __exit exit_nilfs_fs(void) | |
1327 | { | |
41c88bd7 | 1328 | nilfs_destroy_cachep(); |
783f6184 RK |
1329 | unregister_filesystem(&nilfs_fs_type); |
1330 | } | |
1331 | ||
1332 | module_init(init_nilfs_fs) | |
1333 | module_exit(exit_nilfs_fs) |