Commit | Line | Data |
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783f6184 RK |
1 | /* |
2 | * super.c - NILFS module and super block management. | |
3 | * | |
4 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | * | |
20 | * Written by Ryusuke Konishi <ryusuke@osrg.net> | |
21 | */ | |
22 | /* | |
23 | * linux/fs/ext2/super.c | |
24 | * | |
25 | * Copyright (C) 1992, 1993, 1994, 1995 | |
26 | * Remy Card (card@masi.ibp.fr) | |
27 | * Laboratoire MASI - Institut Blaise Pascal | |
28 | * Universite Pierre et Marie Curie (Paris VI) | |
29 | * | |
30 | * from | |
31 | * | |
32 | * linux/fs/minix/inode.c | |
33 | * | |
34 | * Copyright (C) 1991, 1992 Linus Torvalds | |
35 | * | |
36 | * Big-endian to little-endian byte-swapping/bitmaps by | |
37 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
38 | */ | |
39 | ||
40 | #include <linux/module.h> | |
41 | #include <linux/string.h> | |
42 | #include <linux/slab.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/blkdev.h> | |
45 | #include <linux/parser.h> | |
46 | #include <linux/random.h> | |
47 | #include <linux/crc32.h> | |
783f6184 RK |
48 | #include <linux/vfs.h> |
49 | #include <linux/writeback.h> | |
b58a285b JS |
50 | #include <linux/seq_file.h> |
51 | #include <linux/mount.h> | |
783f6184 | 52 | #include "nilfs.h" |
8e656fd5 | 53 | #include "export.h" |
783f6184 RK |
54 | #include "mdt.h" |
55 | #include "alloc.h" | |
05d0e94b RK |
56 | #include "btree.h" |
57 | #include "btnode.h" | |
783f6184 RK |
58 | #include "page.h" |
59 | #include "cpfile.h" | |
60 | #include "ifile.h" | |
61 | #include "dat.h" | |
62 | #include "segment.h" | |
63 | #include "segbuf.h" | |
64 | ||
65 | MODULE_AUTHOR("NTT Corp."); | |
66 | MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem " | |
67 | "(NILFS)"); | |
783f6184 RK |
68 | MODULE_LICENSE("GPL"); |
69 | ||
abc0b50b | 70 | static struct kmem_cache *nilfs_inode_cachep; |
41c88bd7 LH |
71 | struct kmem_cache *nilfs_transaction_cachep; |
72 | struct kmem_cache *nilfs_segbuf_cachep; | |
73 | struct kmem_cache *nilfs_btree_path_cache; | |
74 | ||
5beb6e0b | 75 | static int nilfs_setup_super(struct nilfs_sb_info *sbi, int is_mount); |
783f6184 | 76 | static int nilfs_remount(struct super_block *sb, int *flags, char *data); |
783f6184 | 77 | |
c8a11c8a RK |
78 | static void nilfs_set_error(struct nilfs_sb_info *sbi) |
79 | { | |
80 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 | 81 | struct nilfs_super_block **sbp; |
c8a11c8a RK |
82 | |
83 | down_write(&nilfs->ns_sem); | |
84 | if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { | |
85 | nilfs->ns_mount_state |= NILFS_ERROR_FS; | |
b2ac86e1 | 86 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
87 | if (likely(sbp)) { |
88 | sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
b2ac86e1 JS |
89 | if (sbp[1]) |
90 | sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
91 | nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL); | |
d26493b6 | 92 | } |
c8a11c8a RK |
93 | } |
94 | up_write(&nilfs->ns_sem); | |
95 | } | |
96 | ||
783f6184 RK |
97 | /** |
98 | * nilfs_error() - report failure condition on a filesystem | |
99 | * | |
100 | * nilfs_error() sets an ERROR_FS flag on the superblock as well as | |
101 | * reporting an error message. It should be called when NILFS detects | |
102 | * incoherences or defects of meta data on disk. As for sustainable | |
103 | * errors such as a single-shot I/O error, nilfs_warning() or the printk() | |
104 | * function should be used instead. | |
105 | * | |
106 | * The segment constructor must not call this function because it can | |
107 | * kill itself. | |
108 | */ | |
109 | void nilfs_error(struct super_block *sb, const char *function, | |
110 | const char *fmt, ...) | |
111 | { | |
3b2ce58b | 112 | struct the_nilfs *nilfs = sbi->s_nilfs; |
b004a5eb | 113 | struct va_format vaf; |
783f6184 RK |
114 | va_list args; |
115 | ||
116 | va_start(args, fmt); | |
b004a5eb JP |
117 | |
118 | vaf.fmt = fmt; | |
119 | vaf.va = &args; | |
120 | ||
121 | printk(KERN_CRIT "NILFS error (device %s): %s: %pV\n", | |
122 | sb->s_id, function, &vaf); | |
123 | ||
783f6184 RK |
124 | va_end(args); |
125 | ||
126 | if (!(sb->s_flags & MS_RDONLY)) { | |
c8a11c8a | 127 | nilfs_set_error(sbi); |
783f6184 | 128 | |
3b2ce58b | 129 | if (nilfs_test_opt(nilfs, ERRORS_RO)) { |
783f6184 RK |
130 | printk(KERN_CRIT "Remounting filesystem read-only\n"); |
131 | sb->s_flags |= MS_RDONLY; | |
132 | } | |
133 | } | |
134 | ||
3b2ce58b | 135 | if (nilfs_test_opt(nilfs, ERRORS_PANIC)) |
783f6184 RK |
136 | panic("NILFS (device %s): panic forced after error\n", |
137 | sb->s_id); | |
138 | } | |
139 | ||
140 | void nilfs_warning(struct super_block *sb, const char *function, | |
141 | const char *fmt, ...) | |
142 | { | |
b004a5eb | 143 | struct va_format vaf; |
783f6184 RK |
144 | va_list args; |
145 | ||
146 | va_start(args, fmt); | |
b004a5eb JP |
147 | |
148 | vaf.fmt = fmt; | |
149 | vaf.va = &args; | |
150 | ||
151 | printk(KERN_WARNING "NILFS warning (device %s): %s: %pV\n", | |
152 | sb->s_id, function, &vaf); | |
153 | ||
783f6184 RK |
154 | va_end(args); |
155 | } | |
156 | ||
783f6184 | 157 | |
2879ed66 | 158 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
783f6184 RK |
159 | { |
160 | struct nilfs_inode_info *ii; | |
161 | ||
162 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); | |
163 | if (!ii) | |
164 | return NULL; | |
165 | ii->i_bh = NULL; | |
166 | ii->i_state = 0; | |
0e14a359 | 167 | ii->i_cno = 0; |
783f6184 | 168 | ii->vfs_inode.i_version = 1; |
2879ed66 | 169 | nilfs_btnode_cache_init(&ii->i_btnode_cache, sb->s_bdi); |
783f6184 RK |
170 | return &ii->vfs_inode; |
171 | } | |
172 | ||
fa0d7e3d | 173 | static void nilfs_i_callback(struct rcu_head *head) |
783f6184 | 174 | { |
fa0d7e3d | 175 | struct inode *inode = container_of(head, struct inode, i_rcu); |
b91c9a97 RK |
176 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
177 | ||
fa0d7e3d NP |
178 | INIT_LIST_HEAD(&inode->i_dentry); |
179 | ||
b91c9a97 RK |
180 | if (mdi) { |
181 | kfree(mdi->mi_bgl); /* kfree(NULL) is safe */ | |
182 | kfree(mdi); | |
183 | } | |
783f6184 RK |
184 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
185 | } | |
186 | ||
fa0d7e3d NP |
187 | void nilfs_destroy_inode(struct inode *inode) |
188 | { | |
189 | call_rcu(&inode->i_rcu, nilfs_i_callback); | |
190 | } | |
191 | ||
b2ac86e1 | 192 | static int nilfs_sync_super(struct nilfs_sb_info *sbi, int flag) |
783f6184 RK |
193 | { |
194 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
195 | int err; | |
783f6184 | 196 | |
783f6184 | 197 | retry: |
e339ad31 | 198 | set_buffer_dirty(nilfs->ns_sbh[0]); |
3b2ce58b | 199 | if (nilfs_test_opt(nilfs, BARRIER)) { |
87e99511 | 200 | err = __sync_dirty_buffer(nilfs->ns_sbh[0], |
f8c131f5 | 201 | WRITE_SYNC | WRITE_FLUSH_FUA); |
87e99511 CH |
202 | } else { |
203 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); | |
783f6184 | 204 | } |
87e99511 | 205 | |
e339ad31 | 206 | if (unlikely(err)) { |
783f6184 RK |
207 | printk(KERN_ERR |
208 | "NILFS: unable to write superblock (err=%d)\n", err); | |
e339ad31 | 209 | if (err == -EIO && nilfs->ns_sbh[1]) { |
b2ac86e1 JS |
210 | /* |
211 | * sbp[0] points to newer log than sbp[1], | |
212 | * so copy sbp[0] to sbp[1] to take over sbp[0]. | |
213 | */ | |
214 | memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0], | |
215 | nilfs->ns_sbsize); | |
e339ad31 RK |
216 | nilfs_fall_back_super_block(nilfs); |
217 | goto retry; | |
218 | } | |
219 | } else { | |
220 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; | |
221 | ||
b2ac86e1 JS |
222 | nilfs->ns_sbwcount++; |
223 | ||
e339ad31 RK |
224 | /* |
225 | * The latest segment becomes trailable from the position | |
226 | * written in superblock. | |
227 | */ | |
783f6184 | 228 | clear_nilfs_discontinued(nilfs); |
e339ad31 RK |
229 | |
230 | /* update GC protection for recent segments */ | |
231 | if (nilfs->ns_sbh[1]) { | |
b2ac86e1 | 232 | if (flag == NILFS_SB_COMMIT_ALL) { |
e339ad31 | 233 | set_buffer_dirty(nilfs->ns_sbh[1]); |
b2ac86e1 JS |
234 | if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0) |
235 | goto out; | |
e339ad31 | 236 | } |
b2ac86e1 JS |
237 | if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) < |
238 | le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno)) | |
239 | sbp = nilfs->ns_sbp[1]; | |
e339ad31 | 240 | } |
783f6184 | 241 | |
b2ac86e1 JS |
242 | spin_lock(&nilfs->ns_last_segment_lock); |
243 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); | |
244 | spin_unlock(&nilfs->ns_last_segment_lock); | |
245 | } | |
246 | out: | |
783f6184 RK |
247 | return err; |
248 | } | |
249 | ||
60f46b7e RK |
250 | void nilfs_set_log_cursor(struct nilfs_super_block *sbp, |
251 | struct the_nilfs *nilfs) | |
252 | { | |
253 | sector_t nfreeblocks; | |
254 | ||
255 | /* nilfs->ns_sem must be locked by the caller. */ | |
256 | nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
257 | sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
258 | ||
259 | spin_lock(&nilfs->ns_last_segment_lock); | |
260 | sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
261 | sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
262 | sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
263 | spin_unlock(&nilfs->ns_last_segment_lock); | |
264 | } | |
265 | ||
b2ac86e1 JS |
266 | struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *sbi, |
267 | int flip) | |
783f6184 RK |
268 | { |
269 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
e339ad31 | 270 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 271 | |
d26493b6 | 272 | /* nilfs->ns_sem must be locked by the caller. */ |
34cb9b5c | 273 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
d26493b6 JS |
274 | if (sbp[1] && |
275 | sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
b2ac86e1 | 276 | memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); |
d26493b6 | 277 | } else { |
e339ad31 RK |
278 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", |
279 | sbi->s_super->s_id); | |
d26493b6 | 280 | return NULL; |
e339ad31 | 281 | } |
b2ac86e1 JS |
282 | } else if (sbp[1] && |
283 | sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
284 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
e339ad31 | 285 | } |
b2ac86e1 JS |
286 | |
287 | if (flip && sbp[1]) | |
288 | nilfs_swap_super_block(nilfs); | |
289 | ||
d26493b6 JS |
290 | return sbp; |
291 | } | |
292 | ||
b2ac86e1 | 293 | int nilfs_commit_super(struct nilfs_sb_info *sbi, int flag) |
d26493b6 JS |
294 | { |
295 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
296 | struct nilfs_super_block **sbp = nilfs->ns_sbp; | |
297 | time_t t; | |
298 | ||
299 | /* nilfs->ns_sem must be locked by the caller. */ | |
e339ad31 | 300 | t = get_seconds(); |
b2ac86e1 | 301 | nilfs->ns_sbwtime = t; |
e339ad31 RK |
302 | sbp[0]->s_wtime = cpu_to_le64(t); |
303 | sbp[0]->s_sum = 0; | |
304 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
305 | (unsigned char *)sbp[0], | |
306 | nilfs->ns_sbsize)); | |
b2ac86e1 JS |
307 | if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) { |
308 | sbp[1]->s_wtime = sbp[0]->s_wtime; | |
309 | sbp[1]->s_sum = 0; | |
310 | sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
311 | (unsigned char *)sbp[1], | |
312 | nilfs->ns_sbsize)); | |
e339ad31 | 313 | } |
e605f0a7 | 314 | clear_nilfs_sb_dirty(nilfs); |
b2ac86e1 | 315 | return nilfs_sync_super(sbi, flag); |
783f6184 RK |
316 | } |
317 | ||
7ecaa46c RK |
318 | /** |
319 | * nilfs_cleanup_super() - write filesystem state for cleanup | |
320 | * @sbi: nilfs_sb_info to be unmounted or degraded to read-only | |
321 | * | |
322 | * This function restores state flags in the on-disk super block. | |
323 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the | |
324 | * filesystem was not clean previously. | |
325 | */ | |
326 | int nilfs_cleanup_super(struct nilfs_sb_info *sbi) | |
327 | { | |
d26493b6 | 328 | struct nilfs_super_block **sbp; |
b2ac86e1 | 329 | int flag = NILFS_SB_COMMIT; |
d26493b6 | 330 | int ret = -EIO; |
7ecaa46c | 331 | |
b2ac86e1 | 332 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
333 | if (sbp) { |
334 | sbp[0]->s_state = cpu_to_le16(sbi->s_nilfs->ns_mount_state); | |
b2ac86e1 JS |
335 | nilfs_set_log_cursor(sbp[0], sbi->s_nilfs); |
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 | } | |
345 | ret = nilfs_commit_super(sbi, flag); | |
d26493b6 | 346 | } |
7ecaa46c RK |
347 | return ret; |
348 | } | |
349 | ||
783f6184 RK |
350 | static void nilfs_put_super(struct super_block *sb) |
351 | { | |
352 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
353 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
354 | ||
355 | nilfs_detach_segment_constructor(sbi); | |
356 | ||
357 | if (!(sb->s_flags & MS_RDONLY)) { | |
358 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 359 | nilfs_cleanup_super(sbi); |
783f6184 RK |
360 | up_write(&nilfs->ns_sem); |
361 | } | |
362 | ||
f1e89c86 RK |
363 | iput(nilfs->ns_sufile); |
364 | iput(nilfs->ns_cpfile); | |
365 | iput(nilfs->ns_dat); | |
366 | ||
348fe8da | 367 | destroy_nilfs(nilfs); |
783f6184 RK |
368 | sbi->s_super = NULL; |
369 | sb->s_fs_info = NULL; | |
f11459ad | 370 | kfree(sbi); |
783f6184 RK |
371 | } |
372 | ||
783f6184 RK |
373 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
374 | { | |
6233caa9 JS |
375 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
376 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 | 377 | struct nilfs_super_block **sbp; |
783f6184 RK |
378 | int err = 0; |
379 | ||
380 | /* This function is called when super block should be written back */ | |
381 | if (wait) | |
382 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
383 | |
384 | down_write(&nilfs->ns_sem); | |
d26493b6 | 385 | if (nilfs_sb_dirty(nilfs)) { |
b2ac86e1 JS |
386 | sbp = nilfs_prepare_super(sbi, nilfs_sb_will_flip(nilfs)); |
387 | if (likely(sbp)) { | |
388 | nilfs_set_log_cursor(sbp[0], nilfs); | |
389 | nilfs_commit_super(sbi, NILFS_SB_COMMIT); | |
390 | } | |
d26493b6 | 391 | } |
6233caa9 JS |
392 | up_write(&nilfs->ns_sem); |
393 | ||
783f6184 RK |
394 | return err; |
395 | } | |
396 | ||
4d8d9293 RK |
397 | int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno, int curr_mnt, |
398 | struct nilfs_root **rootp) | |
783f6184 RK |
399 | { |
400 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
4d8d9293 | 401 | struct nilfs_root *root; |
783f6184 RK |
402 | struct nilfs_checkpoint *raw_cp; |
403 | struct buffer_head *bh_cp; | |
4d8d9293 | 404 | int err = -ENOMEM; |
783f6184 | 405 | |
4d8d9293 RK |
406 | root = nilfs_find_or_create_root( |
407 | nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); | |
408 | if (!root) | |
409 | return err; | |
783f6184 | 410 | |
e912a5b6 RK |
411 | if (root->ifile) |
412 | goto reuse; /* already attached checkpoint */ | |
783f6184 | 413 | |
1154ecbd | 414 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
415 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
416 | &bh_cp); | |
1154ecbd | 417 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
418 | if (unlikely(err)) { |
419 | if (err == -ENOENT || err == -EINVAL) { | |
420 | printk(KERN_ERR | |
421 | "NILFS: Invalid checkpoint " | |
422 | "(checkpoint number=%llu)\n", | |
423 | (unsigned long long)cno); | |
424 | err = -EINVAL; | |
425 | } | |
426 | goto failed; | |
427 | } | |
f1e89c86 RK |
428 | |
429 | err = nilfs_ifile_read(sbi->s_super, root, nilfs->ns_inode_size, | |
430 | &raw_cp->cp_ifile_inode, &root->ifile); | |
431 | if (err) | |
783f6184 | 432 | goto failed_bh; |
b7c06342 RK |
433 | |
434 | atomic_set(&root->inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); | |
435 | atomic_set(&root->blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); | |
783f6184 RK |
436 | |
437 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
4d8d9293 | 438 | |
e912a5b6 | 439 | reuse: |
4d8d9293 | 440 | *rootp = root; |
783f6184 RK |
441 | return 0; |
442 | ||
443 | failed_bh: | |
444 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
445 | failed: | |
4d8d9293 | 446 | nilfs_put_root(root); |
783f6184 RK |
447 | |
448 | return err; | |
449 | } | |
783f6184 | 450 | |
5beb6e0b RK |
451 | static int nilfs_freeze(struct super_block *sb) |
452 | { | |
453 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
454 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
455 | int err; | |
456 | ||
457 | if (sb->s_flags & MS_RDONLY) | |
458 | return 0; | |
783f6184 | 459 | |
5beb6e0b RK |
460 | /* Mark super block clean */ |
461 | down_write(&nilfs->ns_sem); | |
462 | err = nilfs_cleanup_super(sbi); | |
463 | up_write(&nilfs->ns_sem); | |
783f6184 RK |
464 | return err; |
465 | } | |
466 | ||
5beb6e0b | 467 | static int nilfs_unfreeze(struct super_block *sb) |
783f6184 | 468 | { |
5beb6e0b | 469 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
783f6184 RK |
470 | struct the_nilfs *nilfs = sbi->s_nilfs; |
471 | ||
5beb6e0b RK |
472 | if (sb->s_flags & MS_RDONLY) |
473 | return 0; | |
474 | ||
475 | down_write(&nilfs->ns_sem); | |
476 | nilfs_setup_super(sbi, false); | |
477 | up_write(&nilfs->ns_sem); | |
478 | return 0; | |
783f6184 RK |
479 | } |
480 | ||
783f6184 RK |
481 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
482 | { | |
483 | struct super_block *sb = dentry->d_sb; | |
b7c06342 RK |
484 | struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root; |
485 | struct the_nilfs *nilfs = root->nilfs; | |
c306af23 | 486 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
783f6184 RK |
487 | unsigned long long blocks; |
488 | unsigned long overhead; | |
489 | unsigned long nrsvblocks; | |
490 | sector_t nfreeblocks; | |
783f6184 RK |
491 | int err; |
492 | ||
493 | /* | |
494 | * Compute all of the segment blocks | |
495 | * | |
496 | * The blocks before first segment and after last segment | |
497 | * are excluded. | |
498 | */ | |
499 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
500 | - nilfs->ns_first_data_block; | |
501 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
502 | ||
503 | /* | |
504 | * Compute the overhead | |
505 | * | |
7a65004b | 506 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
507 | * We must count them as the overhead. |
508 | */ | |
509 | overhead = 0; | |
510 | ||
511 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
512 | if (unlikely(err)) | |
513 | return err; | |
514 | ||
515 | buf->f_type = NILFS_SUPER_MAGIC; | |
516 | buf->f_bsize = sb->s_blocksize; | |
517 | buf->f_blocks = blocks - overhead; | |
518 | buf->f_bfree = nfreeblocks; | |
519 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
520 | (buf->f_bfree - nrsvblocks) : 0; | |
b7c06342 | 521 | buf->f_files = atomic_read(&root->inodes_count); |
783f6184 RK |
522 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ |
523 | buf->f_namelen = NILFS_NAME_LEN; | |
c306af23 RK |
524 | buf->f_fsid.val[0] = (u32)id; |
525 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
526 | ||
783f6184 RK |
527 | return 0; |
528 | } | |
529 | ||
b58a285b JS |
530 | static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
531 | { | |
532 | struct super_block *sb = vfs->mnt_sb; | |
3b2ce58b | 533 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
f11459ad | 534 | struct nilfs_root *root = NILFS_I(vfs->mnt_root->d_inode)->i_root; |
b58a285b | 535 | |
3b2ce58b | 536 | if (!nilfs_test_opt(nilfs, BARRIER)) |
c6b4d57d | 537 | seq_puts(seq, ",nobarrier"); |
f11459ad RK |
538 | if (root->cno != NILFS_CPTREE_CURRENT_CNO) |
539 | seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno); | |
3b2ce58b | 540 | if (nilfs_test_opt(nilfs, ERRORS_PANIC)) |
c6b4d57d | 541 | seq_puts(seq, ",errors=panic"); |
3b2ce58b | 542 | if (nilfs_test_opt(nilfs, ERRORS_CONT)) |
c6b4d57d | 543 | seq_puts(seq, ",errors=continue"); |
3b2ce58b | 544 | if (nilfs_test_opt(nilfs, STRICT_ORDER)) |
c6b4d57d | 545 | seq_puts(seq, ",order=strict"); |
3b2ce58b | 546 | if (nilfs_test_opt(nilfs, NORECOVERY)) |
c6b4d57d | 547 | seq_puts(seq, ",norecovery"); |
3b2ce58b | 548 | if (nilfs_test_opt(nilfs, DISCARD)) |
c6b4d57d | 549 | seq_puts(seq, ",discard"); |
b58a285b JS |
550 | |
551 | return 0; | |
552 | } | |
553 | ||
b87221de | 554 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
555 | .alloc_inode = nilfs_alloc_inode, |
556 | .destroy_inode = nilfs_destroy_inode, | |
557 | .dirty_inode = nilfs_dirty_inode, | |
558 | /* .write_inode = nilfs_write_inode, */ | |
559 | /* .put_inode = nilfs_put_inode, */ | |
560 | /* .drop_inode = nilfs_drop_inode, */ | |
6fd1e5c9 | 561 | .evict_inode = nilfs_evict_inode, |
783f6184 | 562 | .put_super = nilfs_put_super, |
1dfa2710 | 563 | /* .write_super = nilfs_write_super, */ |
783f6184 | 564 | .sync_fs = nilfs_sync_fs, |
5beb6e0b RK |
565 | .freeze_fs = nilfs_freeze, |
566 | .unfreeze_fs = nilfs_unfreeze, | |
783f6184 RK |
567 | /* .write_super_lockfs */ |
568 | /* .unlockfs */ | |
569 | .statfs = nilfs_statfs, | |
570 | .remount_fs = nilfs_remount, | |
783f6184 | 571 | /* .umount_begin */ |
b58a285b | 572 | .show_options = nilfs_show_options |
783f6184 RK |
573 | }; |
574 | ||
783f6184 RK |
575 | enum { |
576 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
773bc4f3 | 577 | Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
802d3177 | 578 | Opt_discard, Opt_nodiscard, Opt_err, |
783f6184 RK |
579 | }; |
580 | ||
581 | static match_table_t tokens = { | |
582 | {Opt_err_cont, "errors=continue"}, | |
583 | {Opt_err_panic, "errors=panic"}, | |
584 | {Opt_err_ro, "errors=remount-ro"}, | |
773bc4f3 | 585 | {Opt_barrier, "barrier"}, |
91f1953b | 586 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
587 | {Opt_snapshot, "cp=%u"}, |
588 | {Opt_order, "order=%s"}, | |
0234576d | 589 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 590 | {Opt_discard, "discard"}, |
802d3177 | 591 | {Opt_nodiscard, "nodiscard"}, |
783f6184 RK |
592 | {Opt_err, NULL} |
593 | }; | |
594 | ||
7c017457 | 595 | static int parse_options(char *options, struct super_block *sb, int is_remount) |
783f6184 | 596 | { |
3b2ce58b | 597 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
783f6184 RK |
598 | char *p; |
599 | substring_t args[MAX_OPT_ARGS]; | |
783f6184 RK |
600 | |
601 | if (!options) | |
602 | return 1; | |
603 | ||
604 | while ((p = strsep(&options, ",")) != NULL) { | |
605 | int token; | |
606 | if (!*p) | |
607 | continue; | |
608 | ||
609 | token = match_token(p, tokens, args); | |
610 | switch (token) { | |
773bc4f3 | 611 | case Opt_barrier: |
3b2ce58b | 612 | nilfs_set_opt(nilfs, BARRIER); |
773bc4f3 | 613 | break; |
91f1953b | 614 | case Opt_nobarrier: |
3b2ce58b | 615 | nilfs_clear_opt(nilfs, BARRIER); |
783f6184 RK |
616 | break; |
617 | case Opt_order: | |
618 | if (strcmp(args[0].from, "relaxed") == 0) | |
619 | /* Ordered data semantics */ | |
3b2ce58b | 620 | nilfs_clear_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
621 | else if (strcmp(args[0].from, "strict") == 0) |
622 | /* Strict in-order semantics */ | |
3b2ce58b | 623 | nilfs_set_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
624 | else |
625 | return 0; | |
626 | break; | |
627 | case Opt_err_panic: | |
3b2ce58b | 628 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC); |
783f6184 RK |
629 | break; |
630 | case Opt_err_ro: | |
3b2ce58b | 631 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO); |
783f6184 RK |
632 | break; |
633 | case Opt_err_cont: | |
3b2ce58b | 634 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT); |
783f6184 RK |
635 | break; |
636 | case Opt_snapshot: | |
7c017457 | 637 | if (is_remount) { |
f11459ad RK |
638 | printk(KERN_ERR |
639 | "NILFS: \"%s\" option is invalid " | |
640 | "for remount.\n", p); | |
783f6184 | 641 | return 0; |
7c017457 | 642 | } |
783f6184 | 643 | break; |
0234576d | 644 | case Opt_norecovery: |
3b2ce58b | 645 | nilfs_set_opt(nilfs, NORECOVERY); |
0234576d | 646 | break; |
e902ec99 | 647 | case Opt_discard: |
3b2ce58b | 648 | nilfs_set_opt(nilfs, DISCARD); |
e902ec99 | 649 | break; |
802d3177 | 650 | case Opt_nodiscard: |
3b2ce58b | 651 | nilfs_clear_opt(nilfs, DISCARD); |
802d3177 | 652 | break; |
783f6184 RK |
653 | default: |
654 | printk(KERN_ERR | |
655 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
656 | return 0; | |
657 | } | |
658 | } | |
659 | return 1; | |
660 | } | |
661 | ||
662 | static inline void | |
3b2ce58b | 663 | nilfs_set_default_options(struct super_block *sb, |
783f6184 RK |
664 | struct nilfs_super_block *sbp) |
665 | { | |
3b2ce58b RK |
666 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
667 | ||
668 | nilfs->ns_mount_opt = | |
277a6a34 | 669 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
670 | } |
671 | ||
5beb6e0b | 672 | static int nilfs_setup_super(struct nilfs_sb_info *sbi, int is_mount) |
783f6184 RK |
673 | { |
674 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 JS |
675 | struct nilfs_super_block **sbp; |
676 | int max_mnt_count; | |
677 | int mnt_count; | |
678 | ||
679 | /* nilfs->ns_sem must be locked by the caller. */ | |
b2ac86e1 | 680 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
681 | if (!sbp) |
682 | return -EIO; | |
683 | ||
5beb6e0b RK |
684 | if (!is_mount) |
685 | goto skip_mount_setup; | |
686 | ||
d26493b6 JS |
687 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); |
688 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); | |
783f6184 | 689 | |
f50a4c81 | 690 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
783f6184 RK |
691 | printk(KERN_WARNING |
692 | "NILFS warning: mounting fs with errors\n"); | |
693 | #if 0 | |
694 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
695 | printk(KERN_WARNING | |
696 | "NILFS warning: maximal mount count reached\n"); | |
697 | #endif | |
698 | } | |
699 | if (!max_mnt_count) | |
d26493b6 | 700 | sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
783f6184 | 701 | |
d26493b6 | 702 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
5beb6e0b RK |
703 | sbp[0]->s_mtime = cpu_to_le64(get_seconds()); |
704 | ||
705 | skip_mount_setup: | |
d26493b6 JS |
706 | sbp[0]->s_state = |
707 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); | |
b2ac86e1 | 708 | /* synchronize sbp[1] with sbp[0] */ |
0ca7a5b9 RK |
709 | if (sbp[1]) |
710 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
b2ac86e1 | 711 | return nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL); |
783f6184 RK |
712 | } |
713 | ||
e339ad31 RK |
714 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
715 | u64 pos, int blocksize, | |
716 | struct buffer_head **pbh) | |
783f6184 | 717 | { |
e339ad31 RK |
718 | unsigned long long sb_index = pos; |
719 | unsigned long offset; | |
783f6184 | 720 | |
e339ad31 | 721 | offset = do_div(sb_index, blocksize); |
783f6184 | 722 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 723 | if (!*pbh) |
783f6184 | 724 | return NULL; |
783f6184 RK |
725 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
726 | } | |
727 | ||
783f6184 RK |
728 | int nilfs_store_magic_and_option(struct super_block *sb, |
729 | struct nilfs_super_block *sbp, | |
730 | char *data) | |
731 | { | |
732 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
733 | ||
783f6184 RK |
734 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
735 | ||
736 | /* FS independent flags */ | |
737 | #ifdef NILFS_ATIME_DISABLE | |
738 | sb->s_flags |= MS_NOATIME; | |
739 | #endif | |
740 | ||
3b2ce58b | 741 | nilfs_set_default_options(sb, sbp); |
783f6184 RK |
742 | |
743 | sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid); | |
744 | sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid); | |
745 | sbi->s_interval = le32_to_cpu(sbp->s_c_interval); | |
746 | sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max); | |
747 | ||
7c017457 | 748 | return !parse_options(data, sb, 0) ? -EINVAL : 0 ; |
783f6184 RK |
749 | } |
750 | ||
c5ca48aa RK |
751 | int nilfs_check_feature_compatibility(struct super_block *sb, |
752 | struct nilfs_super_block *sbp) | |
753 | { | |
754 | __u64 features; | |
755 | ||
756 | features = le64_to_cpu(sbp->s_feature_incompat) & | |
757 | ~NILFS_FEATURE_INCOMPAT_SUPP; | |
758 | if (features) { | |
759 | printk(KERN_ERR "NILFS: couldn't mount because of unsupported " | |
760 | "optional features (%llx)\n", | |
761 | (unsigned long long)features); | |
762 | return -EINVAL; | |
763 | } | |
764 | features = le64_to_cpu(sbp->s_feature_compat_ro) & | |
765 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
766 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
767 | printk(KERN_ERR "NILFS: couldn't mount RDWR because of " | |
768 | "unsupported optional features (%llx)\n", | |
769 | (unsigned long long)features); | |
770 | return -EINVAL; | |
771 | } | |
772 | return 0; | |
773 | } | |
774 | ||
367ea334 RK |
775 | static int nilfs_get_root_dentry(struct super_block *sb, |
776 | struct nilfs_root *root, | |
777 | struct dentry **root_dentry) | |
778 | { | |
779 | struct inode *inode; | |
780 | struct dentry *dentry; | |
781 | int ret = 0; | |
782 | ||
783 | inode = nilfs_iget(sb, root, NILFS_ROOT_INO); | |
784 | if (IS_ERR(inode)) { | |
785 | printk(KERN_ERR "NILFS: get root inode failed\n"); | |
786 | ret = PTR_ERR(inode); | |
787 | goto out; | |
788 | } | |
789 | if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { | |
790 | iput(inode); | |
791 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); | |
792 | ret = -EINVAL; | |
793 | goto out; | |
794 | } | |
795 | ||
f11459ad RK |
796 | if (root->cno == NILFS_CPTREE_CURRENT_CNO) { |
797 | dentry = d_find_alias(inode); | |
798 | if (!dentry) { | |
799 | dentry = d_alloc_root(inode); | |
800 | if (!dentry) { | |
801 | iput(inode); | |
802 | ret = -ENOMEM; | |
803 | goto failed_dentry; | |
804 | } | |
805 | } else { | |
806 | iput(inode); | |
807 | } | |
808 | } else { | |
809 | dentry = d_obtain_alias(inode); | |
810 | if (IS_ERR(dentry)) { | |
811 | ret = PTR_ERR(dentry); | |
812 | goto failed_dentry; | |
813 | } | |
367ea334 RK |
814 | } |
815 | *root_dentry = dentry; | |
816 | out: | |
817 | return ret; | |
f11459ad RK |
818 | |
819 | failed_dentry: | |
820 | printk(KERN_ERR "NILFS: get root dentry failed\n"); | |
821 | goto out; | |
367ea334 RK |
822 | } |
823 | ||
ab4d8f7e RK |
824 | static int nilfs_attach_snapshot(struct super_block *s, __u64 cno, |
825 | struct dentry **root_dentry) | |
826 | { | |
827 | struct the_nilfs *nilfs = NILFS_SB(s)->s_nilfs; | |
828 | struct nilfs_root *root; | |
829 | int ret; | |
830 | ||
831 | down_read(&nilfs->ns_segctor_sem); | |
832 | ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno); | |
833 | up_read(&nilfs->ns_segctor_sem); | |
834 | if (ret < 0) { | |
835 | ret = (ret == -ENOENT) ? -EINVAL : ret; | |
836 | goto out; | |
837 | } else if (!ret) { | |
838 | printk(KERN_ERR "NILFS: The specified checkpoint is " | |
839 | "not a snapshot (checkpoint number=%llu).\n", | |
840 | (unsigned long long)cno); | |
841 | ret = -EINVAL; | |
842 | goto out; | |
843 | } | |
844 | ||
845 | ret = nilfs_attach_checkpoint(NILFS_SB(s), cno, false, &root); | |
846 | if (ret) { | |
847 | printk(KERN_ERR "NILFS: error loading snapshot " | |
848 | "(checkpoint number=%llu).\n", | |
849 | (unsigned long long)cno); | |
850 | goto out; | |
851 | } | |
852 | ret = nilfs_get_root_dentry(s, root, root_dentry); | |
853 | nilfs_put_root(root); | |
854 | out: | |
855 | return ret; | |
856 | } | |
857 | ||
f11459ad RK |
858 | static int nilfs_tree_was_touched(struct dentry *root_dentry) |
859 | { | |
b7ab39f6 | 860 | return root_dentry->d_count > 1; |
f11459ad RK |
861 | } |
862 | ||
863 | /** | |
864 | * nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint | |
865 | * @root_dentry: root dentry of the tree to be shrunk | |
866 | * | |
867 | * This function returns true if the tree was in-use. | |
868 | */ | |
869 | static int nilfs_try_to_shrink_tree(struct dentry *root_dentry) | |
870 | { | |
871 | if (have_submounts(root_dentry)) | |
872 | return true; | |
873 | shrink_dcache_parent(root_dentry); | |
874 | return nilfs_tree_was_touched(root_dentry); | |
875 | } | |
876 | ||
032dbb3b RK |
877 | int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno) |
878 | { | |
879 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; | |
880 | struct nilfs_root *root; | |
881 | struct inode *inode; | |
882 | struct dentry *dentry; | |
883 | int ret; | |
884 | ||
885 | if (cno < 0 || cno > nilfs->ns_cno) | |
886 | return false; | |
887 | ||
888 | if (cno >= nilfs_last_cno(nilfs)) | |
889 | return true; /* protect recent checkpoints */ | |
890 | ||
891 | ret = false; | |
892 | root = nilfs_lookup_root(NILFS_SB(sb)->s_nilfs, cno); | |
893 | if (root) { | |
894 | inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO); | |
895 | if (inode) { | |
896 | dentry = d_find_alias(inode); | |
897 | if (dentry) { | |
898 | if (nilfs_tree_was_touched(dentry)) | |
899 | ret = nilfs_try_to_shrink_tree(dentry); | |
900 | dput(dentry); | |
901 | } | |
902 | iput(inode); | |
903 | } | |
904 | nilfs_put_root(root); | |
905 | } | |
906 | return ret; | |
907 | } | |
908 | ||
783f6184 RK |
909 | /** |
910 | * nilfs_fill_super() - initialize a super block instance | |
911 | * @sb: super_block | |
912 | * @data: mount options | |
913 | * @silent: silent mode flag | |
783f6184 | 914 | * |
aa7dfb89 | 915 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
916 | * So, the recovery process is protected from other simultaneous mounts. |
917 | */ | |
918 | static int | |
348fe8da | 919 | nilfs_fill_super(struct super_block *sb, void *data, int silent) |
783f6184 | 920 | { |
348fe8da | 921 | struct the_nilfs *nilfs; |
783f6184 | 922 | struct nilfs_sb_info *sbi; |
4d8d9293 | 923 | struct nilfs_root *fsroot; |
026a7d63 | 924 | struct backing_dev_info *bdi; |
783f6184 RK |
925 | __u64 cno; |
926 | int err; | |
927 | ||
928 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
929 | if (!sbi) | |
930 | return -ENOMEM; | |
931 | ||
932 | sb->s_fs_info = sbi; | |
348fe8da | 933 | sbi->s_super = sb; |
783f6184 | 934 | |
348fe8da RK |
935 | nilfs = alloc_nilfs(sb->s_bdev); |
936 | if (!nilfs) { | |
937 | err = -ENOMEM; | |
938 | goto failed_sbi; | |
939 | } | |
783f6184 | 940 | sbi->s_nilfs = nilfs; |
783f6184 RK |
941 | |
942 | err = init_nilfs(nilfs, sbi, (char *)data); | |
943 | if (err) | |
348fe8da | 944 | goto failed_nilfs; |
783f6184 RK |
945 | |
946 | spin_lock_init(&sbi->s_inode_lock); | |
947 | INIT_LIST_HEAD(&sbi->s_dirty_files); | |
783f6184 RK |
948 | |
949 | /* | |
950 | * Following initialization is overlapped because | |
951 | * nilfs_sb_info structure has been cleared at the beginning. | |
952 | * But we reserve them to keep our interest and make ready | |
953 | * for the future change. | |
954 | */ | |
955 | get_random_bytes(&sbi->s_next_generation, | |
956 | sizeof(sbi->s_next_generation)); | |
957 | spin_lock_init(&sbi->s_next_gen_lock); | |
958 | ||
959 | sb->s_op = &nilfs_sops; | |
960 | sb->s_export_op = &nilfs_export_ops; | |
961 | sb->s_root = NULL; | |
61239230 | 962 | sb->s_time_gran = 1; |
026a7d63 RK |
963 | |
964 | bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info; | |
965 | sb->s_bdi = bdi ? : &default_backing_dev_info; | |
783f6184 | 966 | |
f50a4c81 RK |
967 | err = load_nilfs(nilfs, sbi); |
968 | if (err) | |
348fe8da | 969 | goto failed_nilfs; |
f50a4c81 | 970 | |
783f6184 | 971 | cno = nilfs_last_cno(nilfs); |
ab4d8f7e | 972 | err = nilfs_attach_checkpoint(sbi, cno, true, &fsroot); |
783f6184 | 973 | if (err) { |
f11459ad RK |
974 | printk(KERN_ERR "NILFS: error loading last checkpoint " |
975 | "(checkpoint number=%llu).\n", (unsigned long long)cno); | |
f1e89c86 | 976 | goto failed_unload; |
783f6184 RK |
977 | } |
978 | ||
979 | if (!(sb->s_flags & MS_RDONLY)) { | |
e912a5b6 | 980 | err = nilfs_attach_segment_constructor(sbi, fsroot); |
783f6184 RK |
981 | if (err) |
982 | goto failed_checkpoint; | |
983 | } | |
984 | ||
367ea334 RK |
985 | err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root); |
986 | if (err) | |
783f6184 | 987 | goto failed_segctor; |
783f6184 | 988 | |
4d8d9293 | 989 | nilfs_put_root(fsroot); |
783f6184 RK |
990 | |
991 | if (!(sb->s_flags & MS_RDONLY)) { | |
992 | down_write(&nilfs->ns_sem); | |
5beb6e0b | 993 | nilfs_setup_super(sbi, true); |
783f6184 RK |
994 | up_write(&nilfs->ns_sem); |
995 | } | |
996 | ||
783f6184 RK |
997 | return 0; |
998 | ||
783f6184 RK |
999 | failed_segctor: |
1000 | nilfs_detach_segment_constructor(sbi); | |
1001 | ||
1002 | failed_checkpoint: | |
4d8d9293 | 1003 | nilfs_put_root(fsroot); |
783f6184 | 1004 | |
f1e89c86 RK |
1005 | failed_unload: |
1006 | iput(nilfs->ns_sufile); | |
1007 | iput(nilfs->ns_cpfile); | |
1008 | iput(nilfs->ns_dat); | |
1009 | ||
348fe8da RK |
1010 | failed_nilfs: |
1011 | destroy_nilfs(nilfs); | |
783f6184 RK |
1012 | |
1013 | failed_sbi: | |
783f6184 | 1014 | sb->s_fs_info = NULL; |
f11459ad | 1015 | kfree(sbi); |
783f6184 RK |
1016 | return err; |
1017 | } | |
1018 | ||
1019 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
1020 | { | |
1021 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
783f6184 RK |
1022 | struct the_nilfs *nilfs = sbi->s_nilfs; |
1023 | unsigned long old_sb_flags; | |
06df0f99 | 1024 | unsigned long old_mount_opt; |
f11459ad | 1025 | int err; |
783f6184 RK |
1026 | |
1027 | old_sb_flags = sb->s_flags; | |
3b2ce58b | 1028 | old_mount_opt = nilfs->ns_mount_opt; |
783f6184 | 1029 | |
7c017457 | 1030 | if (!parse_options(data, sb, 1)) { |
783f6184 RK |
1031 | err = -EINVAL; |
1032 | goto restore_opts; | |
1033 | } | |
1034 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); | |
1035 | ||
d240e067 | 1036 | err = -EINVAL; |
783f6184 | 1037 | |
0234576d RK |
1038 | if (!nilfs_valid_fs(nilfs)) { |
1039 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1040 | "remount because the filesystem is in an " | |
1041 | "incomplete recovery state.\n", sb->s_id); | |
0234576d RK |
1042 | goto restore_opts; |
1043 | } | |
1044 | ||
783f6184 RK |
1045 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
1046 | goto out; | |
1047 | if (*flags & MS_RDONLY) { | |
1048 | /* Shutting down the segment constructor */ | |
1049 | nilfs_detach_segment_constructor(sbi); | |
1050 | sb->s_flags |= MS_RDONLY; | |
1051 | ||
783f6184 RK |
1052 | /* |
1053 | * Remounting a valid RW partition RDONLY, so set | |
1054 | * the RDONLY flag and then mark the partition as valid again. | |
1055 | */ | |
1056 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 1057 | nilfs_cleanup_super(sbi); |
783f6184 RK |
1058 | up_write(&nilfs->ns_sem); |
1059 | } else { | |
c5ca48aa | 1060 | __u64 features; |
e912a5b6 | 1061 | struct nilfs_root *root; |
c5ca48aa | 1062 | |
783f6184 RK |
1063 | /* |
1064 | * Mounting a RDONLY partition read-write, so reread and | |
1065 | * store the current valid flag. (It may have been changed | |
1066 | * by fsck since we originally mounted the partition.) | |
1067 | */ | |
c5ca48aa RK |
1068 | down_read(&nilfs->ns_sem); |
1069 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & | |
1070 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
1071 | up_read(&nilfs->ns_sem); | |
1072 | if (features) { | |
1073 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1074 | "remount RDWR because of unsupported optional " | |
1075 | "features (%llx)\n", | |
1076 | sb->s_id, (unsigned long long)features); | |
1077 | err = -EROFS; | |
1078 | goto restore_opts; | |
1079 | } | |
1080 | ||
783f6184 | 1081 | sb->s_flags &= ~MS_RDONLY; |
783f6184 | 1082 | |
e912a5b6 RK |
1083 | root = NILFS_I(sb->s_root->d_inode)->i_root; |
1084 | err = nilfs_attach_segment_constructor(sbi, root); | |
783f6184 | 1085 | if (err) |
e59399d0 | 1086 | goto restore_opts; |
783f6184 RK |
1087 | |
1088 | down_write(&nilfs->ns_sem); | |
5beb6e0b | 1089 | nilfs_setup_super(sbi, true); |
783f6184 | 1090 | up_write(&nilfs->ns_sem); |
783f6184 RK |
1091 | } |
1092 | out: | |
1093 | return 0; | |
1094 | ||
783f6184 RK |
1095 | restore_opts: |
1096 | sb->s_flags = old_sb_flags; | |
3b2ce58b | 1097 | nilfs->ns_mount_opt = old_mount_opt; |
783f6184 RK |
1098 | return err; |
1099 | } | |
1100 | ||
1101 | struct nilfs_super_data { | |
1102 | struct block_device *bdev; | |
6dd47406 | 1103 | struct nilfs_sb_info *sbi; |
783f6184 RK |
1104 | __u64 cno; |
1105 | int flags; | |
1106 | }; | |
1107 | ||
1108 | /** | |
1109 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
1110 | * @data: mount options | |
1111 | * @sd: nilfs_super_data | |
1112 | */ | |
1113 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
1114 | { | |
1115 | char *p, *options = data; | |
1116 | substring_t args[MAX_OPT_ARGS]; | |
c05dbfc2 | 1117 | int token; |
783f6184 RK |
1118 | int ret = 0; |
1119 | ||
1120 | do { | |
1121 | p = strsep(&options, ","); | |
1122 | if (p != NULL && *p) { | |
1123 | token = match_token(p, tokens, args); | |
1124 | if (token == Opt_snapshot) { | |
c05dbfc2 | 1125 | if (!(sd->flags & MS_RDONLY)) { |
783f6184 | 1126 | ret++; |
c05dbfc2 RK |
1127 | } else { |
1128 | sd->cno = simple_strtoull(args[0].from, | |
1129 | NULL, 0); | |
1130 | /* | |
1131 | * No need to see the end pointer; | |
1132 | * match_token() has done syntax | |
1133 | * checking. | |
1134 | */ | |
1135 | if (sd->cno == 0) | |
1136 | ret++; | |
783f6184 RK |
1137 | } |
1138 | } | |
1139 | if (ret) | |
1140 | printk(KERN_ERR | |
1141 | "NILFS: invalid mount option: %s\n", p); | |
1142 | } | |
1143 | if (!options) | |
1144 | break; | |
1145 | BUG_ON(options == data); | |
1146 | *(options - 1) = ','; | |
1147 | } while (!ret); | |
1148 | return ret; | |
1149 | } | |
1150 | ||
1151 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1152 | { | |
f11459ad | 1153 | s->s_bdev = data; |
783f6184 RK |
1154 | s->s_dev = s->s_bdev->bd_dev; |
1155 | return 0; | |
1156 | } | |
1157 | ||
1158 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 | 1159 | { |
f11459ad | 1160 | return (void *)s->s_bdev == data; |
783f6184 RK |
1161 | } |
1162 | ||
e4c59d61 AV |
1163 | static struct dentry * |
1164 | nilfs_mount(struct file_system_type *fs_type, int flags, | |
1165 | const char *dev_name, void *data) | |
783f6184 RK |
1166 | { |
1167 | struct nilfs_super_data sd; | |
33c8e57c | 1168 | struct super_block *s; |
d4d77629 | 1169 | fmode_t mode = FMODE_READ | FMODE_EXCL; |
f11459ad RK |
1170 | struct dentry *root_dentry; |
1171 | int err, s_new = false; | |
783f6184 | 1172 | |
13e90559 RK |
1173 | if (!(flags & MS_RDONLY)) |
1174 | mode |= FMODE_WRITE; | |
1175 | ||
d4d77629 | 1176 | sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type); |
d6d4c19c | 1177 | if (IS_ERR(sd.bdev)) |
e4c59d61 | 1178 | return ERR_CAST(sd.bdev); |
783f6184 | 1179 | |
783f6184 RK |
1180 | sd.cno = 0; |
1181 | sd.flags = flags; | |
1182 | if (nilfs_identify((char *)data, &sd)) { | |
1183 | err = -EINVAL; | |
1184 | goto failed; | |
1185 | } | |
1186 | ||
6dd47406 | 1187 | /* |
5beb6e0b RK |
1188 | * once the super is inserted into the list by sget, s_umount |
1189 | * will protect the lockfs code from trying to start a snapshot | |
1190 | * while we are mounting | |
6dd47406 | 1191 | */ |
5beb6e0b RK |
1192 | mutex_lock(&sd.bdev->bd_fsfreeze_mutex); |
1193 | if (sd.bdev->bd_fsfreeze_count > 0) { | |
1194 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); | |
1195 | err = -EBUSY; | |
1196 | goto failed; | |
1197 | } | |
f11459ad | 1198 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev); |
5beb6e0b | 1199 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); |
33c8e57c RK |
1200 | if (IS_ERR(s)) { |
1201 | err = PTR_ERR(s); | |
348fe8da | 1202 | goto failed; |
783f6184 RK |
1203 | } |
1204 | ||
1205 | if (!s->s_root) { | |
1206 | char b[BDEVNAME_SIZE]; | |
1207 | ||
f11459ad RK |
1208 | s_new = true; |
1209 | ||
33c8e57c | 1210 | /* New superblock instance created */ |
783f6184 | 1211 | s->s_flags = flags; |
4571b82c | 1212 | s->s_mode = mode; |
783f6184 RK |
1213 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); |
1214 | sb_set_blocksize(s, block_size(sd.bdev)); | |
1215 | ||
348fe8da | 1216 | err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
783f6184 | 1217 | if (err) |
348fe8da | 1218 | goto failed_super; |
783f6184 RK |
1219 | |
1220 | s->s_flags |= MS_ACTIVE; | |
f11459ad RK |
1221 | } else if (!sd.cno) { |
1222 | int busy = false; | |
1223 | ||
1224 | if (nilfs_tree_was_touched(s->s_root)) { | |
1225 | busy = nilfs_try_to_shrink_tree(s->s_root); | |
1226 | if (busy && (flags ^ s->s_flags) & MS_RDONLY) { | |
1227 | printk(KERN_ERR "NILFS: the device already " | |
1228 | "has a %s mount.\n", | |
1229 | (s->s_flags & MS_RDONLY) ? | |
1230 | "read-only" : "read/write"); | |
1231 | err = -EBUSY; | |
1232 | goto failed_super; | |
1233 | } | |
1234 | } | |
1235 | if (!busy) { | |
1236 | /* | |
1237 | * Try remount to setup mount states if the current | |
1238 | * tree is not mounted and only snapshots use this sb. | |
1239 | */ | |
1240 | err = nilfs_remount(s, &flags, data); | |
1241 | if (err) | |
1242 | goto failed_super; | |
1243 | } | |
783f6184 RK |
1244 | } |
1245 | ||
f11459ad RK |
1246 | if (sd.cno) { |
1247 | err = nilfs_attach_snapshot(s, sd.cno, &root_dentry); | |
348fe8da | 1248 | if (err) |
f11459ad | 1249 | goto failed_super; |
f11459ad RK |
1250 | } else { |
1251 | root_dentry = dget(s->s_root); | |
783f6184 RK |
1252 | } |
1253 | ||
f11459ad | 1254 | if (!s_new) |
d4d77629 | 1255 | blkdev_put(sd.bdev, mode); |
783f6184 | 1256 | |
e4c59d61 | 1257 | return root_dentry; |
783f6184 | 1258 | |
f11459ad | 1259 | failed_super: |
a95161aa | 1260 | deactivate_locked_super(s); |
783f6184 | 1261 | |
348fe8da RK |
1262 | failed: |
1263 | if (!s_new) | |
d4d77629 | 1264 | blkdev_put(sd.bdev, mode); |
e4c59d61 | 1265 | return ERR_PTR(err); |
783f6184 RK |
1266 | } |
1267 | ||
783f6184 RK |
1268 | struct file_system_type nilfs_fs_type = { |
1269 | .owner = THIS_MODULE, | |
1270 | .name = "nilfs2", | |
e4c59d61 | 1271 | .mount = nilfs_mount, |
783f6184 RK |
1272 | .kill_sb = kill_block_super, |
1273 | .fs_flags = FS_REQUIRES_DEV, | |
1274 | }; | |
1275 | ||
41c88bd7 | 1276 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1277 | { |
41c88bd7 | 1278 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1279 | |
41c88bd7 LH |
1280 | INIT_LIST_HEAD(&ii->i_dirty); |
1281 | #ifdef CONFIG_NILFS_XATTR | |
1282 | init_rwsem(&ii->xattr_sem); | |
1283 | #endif | |
2aa15890 | 1284 | address_space_init_once(&ii->i_btnode_cache); |
05d0e94b | 1285 | ii->i_bmap = &ii->i_bmap_data; |
41c88bd7 LH |
1286 | inode_init_once(&ii->vfs_inode); |
1287 | } | |
783f6184 | 1288 | |
41c88bd7 LH |
1289 | static void nilfs_segbuf_init_once(void *obj) |
1290 | { | |
1291 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1292 | } | |
783f6184 | 1293 | |
41c88bd7 LH |
1294 | static void nilfs_destroy_cachep(void) |
1295 | { | |
84cb0999 | 1296 | if (nilfs_inode_cachep) |
41c88bd7 | 1297 | kmem_cache_destroy(nilfs_inode_cachep); |
84cb0999 | 1298 | if (nilfs_transaction_cachep) |
41c88bd7 | 1299 | kmem_cache_destroy(nilfs_transaction_cachep); |
84cb0999 | 1300 | if (nilfs_segbuf_cachep) |
41c88bd7 | 1301 | kmem_cache_destroy(nilfs_segbuf_cachep); |
84cb0999 | 1302 | if (nilfs_btree_path_cache) |
41c88bd7 LH |
1303 | kmem_cache_destroy(nilfs_btree_path_cache); |
1304 | } | |
783f6184 | 1305 | |
41c88bd7 LH |
1306 | static int __init nilfs_init_cachep(void) |
1307 | { | |
1308 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1309 | sizeof(struct nilfs_inode_info), 0, | |
1310 | SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once); | |
1311 | if (!nilfs_inode_cachep) | |
1312 | goto fail; | |
1313 | ||
1314 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1315 | sizeof(struct nilfs_transaction_info), 0, | |
1316 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1317 | if (!nilfs_transaction_cachep) | |
1318 | goto fail; | |
1319 | ||
1320 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1321 | sizeof(struct nilfs_segment_buffer), 0, | |
1322 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1323 | if (!nilfs_segbuf_cachep) | |
1324 | goto fail; | |
1325 | ||
1326 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1327 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1328 | 0, 0, NULL); | |
1329 | if (!nilfs_btree_path_cache) | |
1330 | goto fail; | |
783f6184 RK |
1331 | |
1332 | return 0; | |
1333 | ||
41c88bd7 LH |
1334 | fail: |
1335 | nilfs_destroy_cachep(); | |
1336 | return -ENOMEM; | |
1337 | } | |
1338 | ||
1339 | static int __init init_nilfs_fs(void) | |
1340 | { | |
1341 | int err; | |
783f6184 | 1342 | |
41c88bd7 LH |
1343 | err = nilfs_init_cachep(); |
1344 | if (err) | |
1345 | goto fail; | |
783f6184 | 1346 | |
41c88bd7 LH |
1347 | err = register_filesystem(&nilfs_fs_type); |
1348 | if (err) | |
1349 | goto free_cachep; | |
783f6184 | 1350 | |
9f130263 | 1351 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1352 | return 0; |
783f6184 | 1353 | |
41c88bd7 LH |
1354 | free_cachep: |
1355 | nilfs_destroy_cachep(); | |
1356 | fail: | |
783f6184 RK |
1357 | return err; |
1358 | } | |
1359 | ||
1360 | static void __exit exit_nilfs_fs(void) | |
1361 | { | |
41c88bd7 | 1362 | nilfs_destroy_cachep(); |
783f6184 RK |
1363 | unregister_filesystem(&nilfs_fs_type); |
1364 | } | |
1365 | ||
1366 | module_init(init_nilfs_fs) | |
1367 | module_exit(exit_nilfs_fs) |