Commit | Line | Data |
---|---|---|
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 | { |
f7545144 | 79 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
d26493b6 | 80 | struct nilfs_super_block **sbp; |
c8a11c8a RK |
81 | |
82 | down_write(&nilfs->ns_sem); | |
83 | if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { | |
84 | nilfs->ns_mount_state |= NILFS_ERROR_FS; | |
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 | { | |
f7545144 | 111 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
b004a5eb | 112 | struct va_format vaf; |
783f6184 RK |
113 | va_list args; |
114 | ||
115 | va_start(args, fmt); | |
b004a5eb JP |
116 | |
117 | vaf.fmt = fmt; | |
118 | vaf.va = &args; | |
119 | ||
120 | printk(KERN_CRIT "NILFS error (device %s): %s: %pV\n", | |
121 | sb->s_id, function, &vaf); | |
122 | ||
783f6184 RK |
123 | va_end(args); |
124 | ||
125 | if (!(sb->s_flags & MS_RDONLY)) { | |
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 | { |
f7545144 | 193 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
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 | { |
f7545144 | 268 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
e339ad31 | 269 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 270 | |
d26493b6 | 271 | /* nilfs->ns_sem must be locked by the caller. */ |
34cb9b5c | 272 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
d26493b6 JS |
273 | if (sbp[1] && |
274 | sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
b2ac86e1 | 275 | memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); |
d26493b6 | 276 | } else { |
e339ad31 | 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 | { |
f7545144 | 294 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
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 | { |
f7545144 | 327 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
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 | { | |
352 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
353 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
354 | ||
f7545144 | 355 | nilfs_detach_log_writer(sb); |
783f6184 RK |
356 | |
357 | if (!(sb->s_flags & MS_RDONLY)) { | |
358 | down_write(&nilfs->ns_sem); | |
f7545144 | 359 | nilfs_cleanup_super(sb); |
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 | { | |
f7545144 | 375 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
d26493b6 | 376 | struct nilfs_super_block **sbp; |
783f6184 RK |
377 | int err = 0; |
378 | ||
379 | /* This function is called when super block should be written back */ | |
380 | if (wait) | |
381 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
382 | |
383 | down_write(&nilfs->ns_sem); | |
d26493b6 | 384 | if (nilfs_sb_dirty(nilfs)) { |
f7545144 | 385 | sbp = nilfs_prepare_super(sb, nilfs_sb_will_flip(nilfs)); |
b2ac86e1 JS |
386 | if (likely(sbp)) { |
387 | nilfs_set_log_cursor(sbp[0], nilfs); | |
f7545144 | 388 | nilfs_commit_super(sb, NILFS_SB_COMMIT); |
b2ac86e1 | 389 | } |
d26493b6 | 390 | } |
6233caa9 JS |
391 | up_write(&nilfs->ns_sem); |
392 | ||
783f6184 RK |
393 | return err; |
394 | } | |
395 | ||
f7545144 | 396 | int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt, |
4d8d9293 | 397 | struct nilfs_root **rootp) |
783f6184 | 398 | { |
f7545144 | 399 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
4d8d9293 | 400 | struct nilfs_root *root; |
783f6184 RK |
401 | struct nilfs_checkpoint *raw_cp; |
402 | struct buffer_head *bh_cp; | |
4d8d9293 | 403 | int err = -ENOMEM; |
783f6184 | 404 | |
4d8d9293 RK |
405 | root = nilfs_find_or_create_root( |
406 | nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); | |
407 | if (!root) | |
408 | return err; | |
783f6184 | 409 | |
e912a5b6 RK |
410 | if (root->ifile) |
411 | goto reuse; /* already attached checkpoint */ | |
783f6184 | 412 | |
1154ecbd | 413 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
414 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
415 | &bh_cp); | |
1154ecbd | 416 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
417 | if (unlikely(err)) { |
418 | if (err == -ENOENT || err == -EINVAL) { | |
419 | printk(KERN_ERR | |
420 | "NILFS: Invalid checkpoint " | |
421 | "(checkpoint number=%llu)\n", | |
422 | (unsigned long long)cno); | |
423 | err = -EINVAL; | |
424 | } | |
425 | goto failed; | |
426 | } | |
f1e89c86 | 427 | |
f7545144 | 428 | err = nilfs_ifile_read(sb, root, nilfs->ns_inode_size, |
f1e89c86 RK |
429 | &raw_cp->cp_ifile_inode, &root->ifile); |
430 | if (err) | |
783f6184 | 431 | goto failed_bh; |
b7c06342 RK |
432 | |
433 | atomic_set(&root->inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); | |
434 | atomic_set(&root->blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); | |
783f6184 RK |
435 | |
436 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
4d8d9293 | 437 | |
e912a5b6 | 438 | reuse: |
4d8d9293 | 439 | *rootp = root; |
783f6184 RK |
440 | return 0; |
441 | ||
442 | failed_bh: | |
443 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
444 | failed: | |
4d8d9293 | 445 | nilfs_put_root(root); |
783f6184 RK |
446 | |
447 | return err; | |
448 | } | |
783f6184 | 449 | |
5beb6e0b RK |
450 | static int nilfs_freeze(struct super_block *sb) |
451 | { | |
f7545144 | 452 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
5beb6e0b RK |
453 | int err; |
454 | ||
455 | if (sb->s_flags & MS_RDONLY) | |
456 | return 0; | |
783f6184 | 457 | |
5beb6e0b RK |
458 | /* Mark super block clean */ |
459 | down_write(&nilfs->ns_sem); | |
f7545144 | 460 | err = nilfs_cleanup_super(sb); |
5beb6e0b | 461 | up_write(&nilfs->ns_sem); |
783f6184 RK |
462 | return err; |
463 | } | |
464 | ||
5beb6e0b | 465 | static int nilfs_unfreeze(struct super_block *sb) |
783f6184 | 466 | { |
f7545144 | 467 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
783f6184 | 468 | |
5beb6e0b RK |
469 | if (sb->s_flags & MS_RDONLY) |
470 | return 0; | |
471 | ||
472 | down_write(&nilfs->ns_sem); | |
f7545144 | 473 | nilfs_setup_super(sb, false); |
5beb6e0b RK |
474 | up_write(&nilfs->ns_sem); |
475 | return 0; | |
783f6184 RK |
476 | } |
477 | ||
783f6184 RK |
478 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
479 | { | |
480 | struct super_block *sb = dentry->d_sb; | |
b7c06342 RK |
481 | struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root; |
482 | struct the_nilfs *nilfs = root->nilfs; | |
c306af23 | 483 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
783f6184 RK |
484 | unsigned long long blocks; |
485 | unsigned long overhead; | |
486 | unsigned long nrsvblocks; | |
487 | sector_t nfreeblocks; | |
783f6184 RK |
488 | int err; |
489 | ||
490 | /* | |
491 | * Compute all of the segment blocks | |
492 | * | |
493 | * The blocks before first segment and after last segment | |
494 | * are excluded. | |
495 | */ | |
496 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
497 | - nilfs->ns_first_data_block; | |
498 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
499 | ||
500 | /* | |
501 | * Compute the overhead | |
502 | * | |
7a65004b | 503 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
504 | * We must count them as the overhead. |
505 | */ | |
506 | overhead = 0; | |
507 | ||
508 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
509 | if (unlikely(err)) | |
510 | return err; | |
511 | ||
512 | buf->f_type = NILFS_SUPER_MAGIC; | |
513 | buf->f_bsize = sb->s_blocksize; | |
514 | buf->f_blocks = blocks - overhead; | |
515 | buf->f_bfree = nfreeblocks; | |
516 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
517 | (buf->f_bfree - nrsvblocks) : 0; | |
b7c06342 | 518 | buf->f_files = atomic_read(&root->inodes_count); |
783f6184 RK |
519 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ |
520 | buf->f_namelen = NILFS_NAME_LEN; | |
c306af23 RK |
521 | buf->f_fsid.val[0] = (u32)id; |
522 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
523 | ||
783f6184 RK |
524 | return 0; |
525 | } | |
526 | ||
b58a285b JS |
527 | static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
528 | { | |
529 | struct super_block *sb = vfs->mnt_sb; | |
3b2ce58b | 530 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
f11459ad | 531 | struct nilfs_root *root = NILFS_I(vfs->mnt_root->d_inode)->i_root; |
b58a285b | 532 | |
3b2ce58b | 533 | if (!nilfs_test_opt(nilfs, BARRIER)) |
c6b4d57d | 534 | seq_puts(seq, ",nobarrier"); |
f11459ad RK |
535 | if (root->cno != NILFS_CPTREE_CURRENT_CNO) |
536 | seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno); | |
3b2ce58b | 537 | if (nilfs_test_opt(nilfs, ERRORS_PANIC)) |
c6b4d57d | 538 | seq_puts(seq, ",errors=panic"); |
3b2ce58b | 539 | if (nilfs_test_opt(nilfs, ERRORS_CONT)) |
c6b4d57d | 540 | seq_puts(seq, ",errors=continue"); |
3b2ce58b | 541 | if (nilfs_test_opt(nilfs, STRICT_ORDER)) |
c6b4d57d | 542 | seq_puts(seq, ",order=strict"); |
3b2ce58b | 543 | if (nilfs_test_opt(nilfs, NORECOVERY)) |
c6b4d57d | 544 | seq_puts(seq, ",norecovery"); |
3b2ce58b | 545 | if (nilfs_test_opt(nilfs, DISCARD)) |
c6b4d57d | 546 | seq_puts(seq, ",discard"); |
b58a285b JS |
547 | |
548 | return 0; | |
549 | } | |
550 | ||
b87221de | 551 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
552 | .alloc_inode = nilfs_alloc_inode, |
553 | .destroy_inode = nilfs_destroy_inode, | |
554 | .dirty_inode = nilfs_dirty_inode, | |
555 | /* .write_inode = nilfs_write_inode, */ | |
556 | /* .put_inode = nilfs_put_inode, */ | |
557 | /* .drop_inode = nilfs_drop_inode, */ | |
6fd1e5c9 | 558 | .evict_inode = nilfs_evict_inode, |
783f6184 | 559 | .put_super = nilfs_put_super, |
1dfa2710 | 560 | /* .write_super = nilfs_write_super, */ |
783f6184 | 561 | .sync_fs = nilfs_sync_fs, |
5beb6e0b RK |
562 | .freeze_fs = nilfs_freeze, |
563 | .unfreeze_fs = nilfs_unfreeze, | |
783f6184 RK |
564 | /* .write_super_lockfs */ |
565 | /* .unlockfs */ | |
566 | .statfs = nilfs_statfs, | |
567 | .remount_fs = nilfs_remount, | |
783f6184 | 568 | /* .umount_begin */ |
b58a285b | 569 | .show_options = nilfs_show_options |
783f6184 RK |
570 | }; |
571 | ||
783f6184 RK |
572 | enum { |
573 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
773bc4f3 | 574 | Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
802d3177 | 575 | Opt_discard, Opt_nodiscard, Opt_err, |
783f6184 RK |
576 | }; |
577 | ||
578 | static match_table_t tokens = { | |
579 | {Opt_err_cont, "errors=continue"}, | |
580 | {Opt_err_panic, "errors=panic"}, | |
581 | {Opt_err_ro, "errors=remount-ro"}, | |
773bc4f3 | 582 | {Opt_barrier, "barrier"}, |
91f1953b | 583 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
584 | {Opt_snapshot, "cp=%u"}, |
585 | {Opt_order, "order=%s"}, | |
0234576d | 586 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 587 | {Opt_discard, "discard"}, |
802d3177 | 588 | {Opt_nodiscard, "nodiscard"}, |
783f6184 RK |
589 | {Opt_err, NULL} |
590 | }; | |
591 | ||
7c017457 | 592 | static int parse_options(char *options, struct super_block *sb, int is_remount) |
783f6184 | 593 | { |
3b2ce58b | 594 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
783f6184 RK |
595 | char *p; |
596 | substring_t args[MAX_OPT_ARGS]; | |
783f6184 RK |
597 | |
598 | if (!options) | |
599 | return 1; | |
600 | ||
601 | while ((p = strsep(&options, ",")) != NULL) { | |
602 | int token; | |
603 | if (!*p) | |
604 | continue; | |
605 | ||
606 | token = match_token(p, tokens, args); | |
607 | switch (token) { | |
773bc4f3 | 608 | case Opt_barrier: |
3b2ce58b | 609 | nilfs_set_opt(nilfs, BARRIER); |
773bc4f3 | 610 | break; |
91f1953b | 611 | case Opt_nobarrier: |
3b2ce58b | 612 | nilfs_clear_opt(nilfs, BARRIER); |
783f6184 RK |
613 | break; |
614 | case Opt_order: | |
615 | if (strcmp(args[0].from, "relaxed") == 0) | |
616 | /* Ordered data semantics */ | |
3b2ce58b | 617 | nilfs_clear_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
618 | else if (strcmp(args[0].from, "strict") == 0) |
619 | /* Strict in-order semantics */ | |
3b2ce58b | 620 | nilfs_set_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
621 | else |
622 | return 0; | |
623 | break; | |
624 | case Opt_err_panic: | |
3b2ce58b | 625 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC); |
783f6184 RK |
626 | break; |
627 | case Opt_err_ro: | |
3b2ce58b | 628 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO); |
783f6184 RK |
629 | break; |
630 | case Opt_err_cont: | |
3b2ce58b | 631 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT); |
783f6184 RK |
632 | break; |
633 | case Opt_snapshot: | |
7c017457 | 634 | if (is_remount) { |
f11459ad RK |
635 | printk(KERN_ERR |
636 | "NILFS: \"%s\" option is invalid " | |
637 | "for remount.\n", p); | |
783f6184 | 638 | return 0; |
7c017457 | 639 | } |
783f6184 | 640 | break; |
0234576d | 641 | case Opt_norecovery: |
3b2ce58b | 642 | nilfs_set_opt(nilfs, NORECOVERY); |
0234576d | 643 | break; |
e902ec99 | 644 | case Opt_discard: |
3b2ce58b | 645 | nilfs_set_opt(nilfs, DISCARD); |
e902ec99 | 646 | break; |
802d3177 | 647 | case Opt_nodiscard: |
3b2ce58b | 648 | nilfs_clear_opt(nilfs, DISCARD); |
802d3177 | 649 | break; |
783f6184 RK |
650 | default: |
651 | printk(KERN_ERR | |
652 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
653 | return 0; | |
654 | } | |
655 | } | |
656 | return 1; | |
657 | } | |
658 | ||
659 | static inline void | |
3b2ce58b | 660 | nilfs_set_default_options(struct super_block *sb, |
783f6184 RK |
661 | struct nilfs_super_block *sbp) |
662 | { | |
3b2ce58b RK |
663 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
664 | ||
665 | nilfs->ns_mount_opt = | |
277a6a34 | 666 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
667 | } |
668 | ||
f7545144 | 669 | static int nilfs_setup_super(struct super_block *sb, int is_mount) |
783f6184 | 670 | { |
f7545144 | 671 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
d26493b6 JS |
672 | struct nilfs_super_block **sbp; |
673 | int max_mnt_count; | |
674 | int mnt_count; | |
675 | ||
676 | /* nilfs->ns_sem must be locked by the caller. */ | |
f7545144 | 677 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 JS |
678 | if (!sbp) |
679 | return -EIO; | |
680 | ||
5beb6e0b RK |
681 | if (!is_mount) |
682 | goto skip_mount_setup; | |
683 | ||
d26493b6 JS |
684 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); |
685 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); | |
783f6184 | 686 | |
f50a4c81 | 687 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
783f6184 RK |
688 | printk(KERN_WARNING |
689 | "NILFS warning: mounting fs with errors\n"); | |
690 | #if 0 | |
691 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
692 | printk(KERN_WARNING | |
693 | "NILFS warning: maximal mount count reached\n"); | |
694 | #endif | |
695 | } | |
696 | if (!max_mnt_count) | |
d26493b6 | 697 | sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
783f6184 | 698 | |
d26493b6 | 699 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
5beb6e0b RK |
700 | sbp[0]->s_mtime = cpu_to_le64(get_seconds()); |
701 | ||
702 | skip_mount_setup: | |
d26493b6 JS |
703 | sbp[0]->s_state = |
704 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); | |
b2ac86e1 | 705 | /* synchronize sbp[1] with sbp[0] */ |
0ca7a5b9 RK |
706 | if (sbp[1]) |
707 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
f7545144 | 708 | return nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); |
783f6184 RK |
709 | } |
710 | ||
e339ad31 RK |
711 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
712 | u64 pos, int blocksize, | |
713 | struct buffer_head **pbh) | |
783f6184 | 714 | { |
e339ad31 RK |
715 | unsigned long long sb_index = pos; |
716 | unsigned long offset; | |
783f6184 | 717 | |
e339ad31 | 718 | offset = do_div(sb_index, blocksize); |
783f6184 | 719 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 720 | if (!*pbh) |
783f6184 | 721 | return NULL; |
783f6184 RK |
722 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
723 | } | |
724 | ||
783f6184 RK |
725 | int nilfs_store_magic_and_option(struct super_block *sb, |
726 | struct nilfs_super_block *sbp, | |
727 | char *data) | |
728 | { | |
574e6c31 | 729 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
783f6184 | 730 | |
783f6184 RK |
731 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
732 | ||
733 | /* FS independent flags */ | |
734 | #ifdef NILFS_ATIME_DISABLE | |
735 | sb->s_flags |= MS_NOATIME; | |
736 | #endif | |
737 | ||
3b2ce58b | 738 | nilfs_set_default_options(sb, sbp); |
783f6184 | 739 | |
574e6c31 RK |
740 | nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid); |
741 | nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid); | |
742 | nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval); | |
743 | nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max); | |
783f6184 | 744 | |
7c017457 | 745 | return !parse_options(data, sb, 0) ? -EINVAL : 0 ; |
783f6184 RK |
746 | } |
747 | ||
c5ca48aa RK |
748 | int nilfs_check_feature_compatibility(struct super_block *sb, |
749 | struct nilfs_super_block *sbp) | |
750 | { | |
751 | __u64 features; | |
752 | ||
753 | features = le64_to_cpu(sbp->s_feature_incompat) & | |
754 | ~NILFS_FEATURE_INCOMPAT_SUPP; | |
755 | if (features) { | |
756 | printk(KERN_ERR "NILFS: couldn't mount because of unsupported " | |
757 | "optional features (%llx)\n", | |
758 | (unsigned long long)features); | |
759 | return -EINVAL; | |
760 | } | |
761 | features = le64_to_cpu(sbp->s_feature_compat_ro) & | |
762 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
763 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
764 | printk(KERN_ERR "NILFS: couldn't mount RDWR because of " | |
765 | "unsupported optional features (%llx)\n", | |
766 | (unsigned long long)features); | |
767 | return -EINVAL; | |
768 | } | |
769 | return 0; | |
770 | } | |
771 | ||
367ea334 RK |
772 | static int nilfs_get_root_dentry(struct super_block *sb, |
773 | struct nilfs_root *root, | |
774 | struct dentry **root_dentry) | |
775 | { | |
776 | struct inode *inode; | |
777 | struct dentry *dentry; | |
778 | int ret = 0; | |
779 | ||
780 | inode = nilfs_iget(sb, root, NILFS_ROOT_INO); | |
781 | if (IS_ERR(inode)) { | |
782 | printk(KERN_ERR "NILFS: get root inode failed\n"); | |
783 | ret = PTR_ERR(inode); | |
784 | goto out; | |
785 | } | |
786 | if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { | |
787 | iput(inode); | |
788 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); | |
789 | ret = -EINVAL; | |
790 | goto out; | |
791 | } | |
792 | ||
f11459ad RK |
793 | if (root->cno == NILFS_CPTREE_CURRENT_CNO) { |
794 | dentry = d_find_alias(inode); | |
795 | if (!dentry) { | |
796 | dentry = d_alloc_root(inode); | |
797 | if (!dentry) { | |
798 | iput(inode); | |
799 | ret = -ENOMEM; | |
800 | goto failed_dentry; | |
801 | } | |
802 | } else { | |
803 | iput(inode); | |
804 | } | |
805 | } else { | |
806 | dentry = d_obtain_alias(inode); | |
807 | if (IS_ERR(dentry)) { | |
808 | ret = PTR_ERR(dentry); | |
809 | goto failed_dentry; | |
810 | } | |
367ea334 RK |
811 | } |
812 | *root_dentry = dentry; | |
813 | out: | |
814 | return ret; | |
f11459ad RK |
815 | |
816 | failed_dentry: | |
817 | printk(KERN_ERR "NILFS: get root dentry failed\n"); | |
818 | goto out; | |
367ea334 RK |
819 | } |
820 | ||
ab4d8f7e RK |
821 | static int nilfs_attach_snapshot(struct super_block *s, __u64 cno, |
822 | struct dentry **root_dentry) | |
823 | { | |
824 | struct the_nilfs *nilfs = NILFS_SB(s)->s_nilfs; | |
825 | struct nilfs_root *root; | |
826 | int ret; | |
827 | ||
828 | down_read(&nilfs->ns_segctor_sem); | |
829 | ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno); | |
830 | up_read(&nilfs->ns_segctor_sem); | |
831 | if (ret < 0) { | |
832 | ret = (ret == -ENOENT) ? -EINVAL : ret; | |
833 | goto out; | |
834 | } else if (!ret) { | |
835 | printk(KERN_ERR "NILFS: The specified checkpoint is " | |
836 | "not a snapshot (checkpoint number=%llu).\n", | |
837 | (unsigned long long)cno); | |
838 | ret = -EINVAL; | |
839 | goto out; | |
840 | } | |
841 | ||
f7545144 | 842 | ret = nilfs_attach_checkpoint(s, cno, false, &root); |
ab4d8f7e RK |
843 | if (ret) { |
844 | printk(KERN_ERR "NILFS: error loading snapshot " | |
845 | "(checkpoint number=%llu).\n", | |
846 | (unsigned long long)cno); | |
847 | goto out; | |
848 | } | |
849 | ret = nilfs_get_root_dentry(s, root, root_dentry); | |
850 | nilfs_put_root(root); | |
851 | out: | |
852 | return ret; | |
853 | } | |
854 | ||
f11459ad RK |
855 | static int nilfs_tree_was_touched(struct dentry *root_dentry) |
856 | { | |
b7ab39f6 | 857 | return root_dentry->d_count > 1; |
f11459ad RK |
858 | } |
859 | ||
860 | /** | |
861 | * nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint | |
862 | * @root_dentry: root dentry of the tree to be shrunk | |
863 | * | |
864 | * This function returns true if the tree was in-use. | |
865 | */ | |
866 | static int nilfs_try_to_shrink_tree(struct dentry *root_dentry) | |
867 | { | |
868 | if (have_submounts(root_dentry)) | |
869 | return true; | |
870 | shrink_dcache_parent(root_dentry); | |
871 | return nilfs_tree_was_touched(root_dentry); | |
872 | } | |
873 | ||
032dbb3b RK |
874 | int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno) |
875 | { | |
876 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; | |
877 | struct nilfs_root *root; | |
878 | struct inode *inode; | |
879 | struct dentry *dentry; | |
880 | int ret; | |
881 | ||
882 | if (cno < 0 || cno > nilfs->ns_cno) | |
883 | return false; | |
884 | ||
885 | if (cno >= nilfs_last_cno(nilfs)) | |
886 | return true; /* protect recent checkpoints */ | |
887 | ||
888 | ret = false; | |
889 | root = nilfs_lookup_root(NILFS_SB(sb)->s_nilfs, cno); | |
890 | if (root) { | |
891 | inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO); | |
892 | if (inode) { | |
893 | dentry = d_find_alias(inode); | |
894 | if (dentry) { | |
895 | if (nilfs_tree_was_touched(dentry)) | |
896 | ret = nilfs_try_to_shrink_tree(dentry); | |
897 | dput(dentry); | |
898 | } | |
899 | iput(inode); | |
900 | } | |
901 | nilfs_put_root(root); | |
902 | } | |
903 | return ret; | |
904 | } | |
905 | ||
783f6184 RK |
906 | /** |
907 | * nilfs_fill_super() - initialize a super block instance | |
908 | * @sb: super_block | |
909 | * @data: mount options | |
910 | * @silent: silent mode flag | |
783f6184 | 911 | * |
aa7dfb89 | 912 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
913 | * So, the recovery process is protected from other simultaneous mounts. |
914 | */ | |
915 | static int | |
348fe8da | 916 | nilfs_fill_super(struct super_block *sb, void *data, int silent) |
783f6184 | 917 | { |
348fe8da | 918 | struct the_nilfs *nilfs; |
783f6184 | 919 | struct nilfs_sb_info *sbi; |
4d8d9293 | 920 | struct nilfs_root *fsroot; |
026a7d63 | 921 | struct backing_dev_info *bdi; |
783f6184 RK |
922 | __u64 cno; |
923 | int err; | |
924 | ||
925 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
926 | if (!sbi) | |
927 | return -ENOMEM; | |
928 | ||
929 | sb->s_fs_info = sbi; | |
348fe8da | 930 | sbi->s_super = sb; |
783f6184 | 931 | |
348fe8da RK |
932 | nilfs = alloc_nilfs(sb->s_bdev); |
933 | if (!nilfs) { | |
934 | err = -ENOMEM; | |
935 | goto failed_sbi; | |
936 | } | |
783f6184 | 937 | sbi->s_nilfs = nilfs; |
783f6184 | 938 | |
f7545144 | 939 | err = init_nilfs(nilfs, sb, (char *)data); |
783f6184 | 940 | if (err) |
348fe8da | 941 | goto failed_nilfs; |
783f6184 | 942 | |
783f6184 RK |
943 | sb->s_op = &nilfs_sops; |
944 | sb->s_export_op = &nilfs_export_ops; | |
945 | sb->s_root = NULL; | |
61239230 | 946 | sb->s_time_gran = 1; |
026a7d63 RK |
947 | |
948 | bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info; | |
949 | sb->s_bdi = bdi ? : &default_backing_dev_info; | |
783f6184 | 950 | |
f7545144 | 951 | err = load_nilfs(nilfs, sb); |
f50a4c81 | 952 | if (err) |
348fe8da | 953 | goto failed_nilfs; |
f50a4c81 | 954 | |
783f6184 | 955 | cno = nilfs_last_cno(nilfs); |
f7545144 | 956 | err = nilfs_attach_checkpoint(sb, cno, true, &fsroot); |
783f6184 | 957 | if (err) { |
f11459ad RK |
958 | printk(KERN_ERR "NILFS: error loading last checkpoint " |
959 | "(checkpoint number=%llu).\n", (unsigned long long)cno); | |
f1e89c86 | 960 | goto failed_unload; |
783f6184 RK |
961 | } |
962 | ||
963 | if (!(sb->s_flags & MS_RDONLY)) { | |
f7545144 | 964 | err = nilfs_attach_log_writer(sb, fsroot); |
783f6184 RK |
965 | if (err) |
966 | goto failed_checkpoint; | |
967 | } | |
968 | ||
367ea334 RK |
969 | err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root); |
970 | if (err) | |
783f6184 | 971 | goto failed_segctor; |
783f6184 | 972 | |
4d8d9293 | 973 | nilfs_put_root(fsroot); |
783f6184 RK |
974 | |
975 | if (!(sb->s_flags & MS_RDONLY)) { | |
976 | down_write(&nilfs->ns_sem); | |
f7545144 | 977 | nilfs_setup_super(sb, true); |
783f6184 RK |
978 | up_write(&nilfs->ns_sem); |
979 | } | |
980 | ||
783f6184 RK |
981 | return 0; |
982 | ||
783f6184 | 983 | failed_segctor: |
f7545144 | 984 | nilfs_detach_log_writer(sb); |
783f6184 RK |
985 | |
986 | failed_checkpoint: | |
4d8d9293 | 987 | nilfs_put_root(fsroot); |
783f6184 | 988 | |
f1e89c86 RK |
989 | failed_unload: |
990 | iput(nilfs->ns_sufile); | |
991 | iput(nilfs->ns_cpfile); | |
992 | iput(nilfs->ns_dat); | |
993 | ||
348fe8da RK |
994 | failed_nilfs: |
995 | destroy_nilfs(nilfs); | |
783f6184 RK |
996 | |
997 | failed_sbi: | |
783f6184 | 998 | sb->s_fs_info = NULL; |
f11459ad | 999 | kfree(sbi); |
783f6184 RK |
1000 | return err; |
1001 | } | |
1002 | ||
1003 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
1004 | { | |
f7545144 | 1005 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
783f6184 | 1006 | unsigned long old_sb_flags; |
06df0f99 | 1007 | unsigned long old_mount_opt; |
f11459ad | 1008 | int err; |
783f6184 RK |
1009 | |
1010 | old_sb_flags = sb->s_flags; | |
3b2ce58b | 1011 | old_mount_opt = nilfs->ns_mount_opt; |
783f6184 | 1012 | |
7c017457 | 1013 | if (!parse_options(data, sb, 1)) { |
783f6184 RK |
1014 | err = -EINVAL; |
1015 | goto restore_opts; | |
1016 | } | |
1017 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); | |
1018 | ||
d240e067 | 1019 | err = -EINVAL; |
783f6184 | 1020 | |
0234576d RK |
1021 | if (!nilfs_valid_fs(nilfs)) { |
1022 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1023 | "remount because the filesystem is in an " | |
1024 | "incomplete recovery state.\n", sb->s_id); | |
0234576d RK |
1025 | goto restore_opts; |
1026 | } | |
1027 | ||
783f6184 RK |
1028 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
1029 | goto out; | |
1030 | if (*flags & MS_RDONLY) { | |
f7545144 RK |
1031 | /* Shutting down log writer */ |
1032 | nilfs_detach_log_writer(sb); | |
783f6184 RK |
1033 | sb->s_flags |= MS_RDONLY; |
1034 | ||
783f6184 RK |
1035 | /* |
1036 | * Remounting a valid RW partition RDONLY, so set | |
1037 | * the RDONLY flag and then mark the partition as valid again. | |
1038 | */ | |
1039 | down_write(&nilfs->ns_sem); | |
f7545144 | 1040 | nilfs_cleanup_super(sb); |
783f6184 RK |
1041 | up_write(&nilfs->ns_sem); |
1042 | } else { | |
c5ca48aa | 1043 | __u64 features; |
e912a5b6 | 1044 | struct nilfs_root *root; |
c5ca48aa | 1045 | |
783f6184 RK |
1046 | /* |
1047 | * Mounting a RDONLY partition read-write, so reread and | |
1048 | * store the current valid flag. (It may have been changed | |
1049 | * by fsck since we originally mounted the partition.) | |
1050 | */ | |
c5ca48aa RK |
1051 | down_read(&nilfs->ns_sem); |
1052 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & | |
1053 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
1054 | up_read(&nilfs->ns_sem); | |
1055 | if (features) { | |
1056 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1057 | "remount RDWR because of unsupported optional " | |
1058 | "features (%llx)\n", | |
1059 | sb->s_id, (unsigned long long)features); | |
1060 | err = -EROFS; | |
1061 | goto restore_opts; | |
1062 | } | |
1063 | ||
783f6184 | 1064 | sb->s_flags &= ~MS_RDONLY; |
783f6184 | 1065 | |
e912a5b6 | 1066 | root = NILFS_I(sb->s_root->d_inode)->i_root; |
f7545144 | 1067 | err = nilfs_attach_log_writer(sb, root); |
783f6184 | 1068 | if (err) |
e59399d0 | 1069 | goto restore_opts; |
783f6184 RK |
1070 | |
1071 | down_write(&nilfs->ns_sem); | |
f7545144 | 1072 | nilfs_setup_super(sb, true); |
783f6184 | 1073 | up_write(&nilfs->ns_sem); |
783f6184 RK |
1074 | } |
1075 | out: | |
1076 | return 0; | |
1077 | ||
783f6184 RK |
1078 | restore_opts: |
1079 | sb->s_flags = old_sb_flags; | |
3b2ce58b | 1080 | nilfs->ns_mount_opt = old_mount_opt; |
783f6184 RK |
1081 | return err; |
1082 | } | |
1083 | ||
1084 | struct nilfs_super_data { | |
1085 | struct block_device *bdev; | |
6dd47406 | 1086 | struct nilfs_sb_info *sbi; |
783f6184 RK |
1087 | __u64 cno; |
1088 | int flags; | |
1089 | }; | |
1090 | ||
1091 | /** | |
1092 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
1093 | * @data: mount options | |
1094 | * @sd: nilfs_super_data | |
1095 | */ | |
1096 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
1097 | { | |
1098 | char *p, *options = data; | |
1099 | substring_t args[MAX_OPT_ARGS]; | |
c05dbfc2 | 1100 | int token; |
783f6184 RK |
1101 | int ret = 0; |
1102 | ||
1103 | do { | |
1104 | p = strsep(&options, ","); | |
1105 | if (p != NULL && *p) { | |
1106 | token = match_token(p, tokens, args); | |
1107 | if (token == Opt_snapshot) { | |
c05dbfc2 | 1108 | if (!(sd->flags & MS_RDONLY)) { |
783f6184 | 1109 | ret++; |
c05dbfc2 RK |
1110 | } else { |
1111 | sd->cno = simple_strtoull(args[0].from, | |
1112 | NULL, 0); | |
1113 | /* | |
1114 | * No need to see the end pointer; | |
1115 | * match_token() has done syntax | |
1116 | * checking. | |
1117 | */ | |
1118 | if (sd->cno == 0) | |
1119 | ret++; | |
783f6184 RK |
1120 | } |
1121 | } | |
1122 | if (ret) | |
1123 | printk(KERN_ERR | |
1124 | "NILFS: invalid mount option: %s\n", p); | |
1125 | } | |
1126 | if (!options) | |
1127 | break; | |
1128 | BUG_ON(options == data); | |
1129 | *(options - 1) = ','; | |
1130 | } while (!ret); | |
1131 | return ret; | |
1132 | } | |
1133 | ||
1134 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1135 | { | |
f11459ad | 1136 | s->s_bdev = data; |
783f6184 RK |
1137 | s->s_dev = s->s_bdev->bd_dev; |
1138 | return 0; | |
1139 | } | |
1140 | ||
1141 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 | 1142 | { |
f11459ad | 1143 | return (void *)s->s_bdev == data; |
783f6184 RK |
1144 | } |
1145 | ||
e4c59d61 AV |
1146 | static struct dentry * |
1147 | nilfs_mount(struct file_system_type *fs_type, int flags, | |
1148 | const char *dev_name, void *data) | |
783f6184 RK |
1149 | { |
1150 | struct nilfs_super_data sd; | |
33c8e57c | 1151 | struct super_block *s; |
d4d77629 | 1152 | fmode_t mode = FMODE_READ | FMODE_EXCL; |
f11459ad RK |
1153 | struct dentry *root_dentry; |
1154 | int err, s_new = false; | |
783f6184 | 1155 | |
13e90559 RK |
1156 | if (!(flags & MS_RDONLY)) |
1157 | mode |= FMODE_WRITE; | |
1158 | ||
d4d77629 | 1159 | sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type); |
d6d4c19c | 1160 | if (IS_ERR(sd.bdev)) |
e4c59d61 | 1161 | return ERR_CAST(sd.bdev); |
783f6184 | 1162 | |
783f6184 RK |
1163 | sd.cno = 0; |
1164 | sd.flags = flags; | |
1165 | if (nilfs_identify((char *)data, &sd)) { | |
1166 | err = -EINVAL; | |
1167 | goto failed; | |
1168 | } | |
1169 | ||
6dd47406 | 1170 | /* |
5beb6e0b RK |
1171 | * once the super is inserted into the list by sget, s_umount |
1172 | * will protect the lockfs code from trying to start a snapshot | |
1173 | * while we are mounting | |
6dd47406 | 1174 | */ |
5beb6e0b RK |
1175 | mutex_lock(&sd.bdev->bd_fsfreeze_mutex); |
1176 | if (sd.bdev->bd_fsfreeze_count > 0) { | |
1177 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); | |
1178 | err = -EBUSY; | |
1179 | goto failed; | |
1180 | } | |
f11459ad | 1181 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev); |
5beb6e0b | 1182 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); |
33c8e57c RK |
1183 | if (IS_ERR(s)) { |
1184 | err = PTR_ERR(s); | |
348fe8da | 1185 | goto failed; |
783f6184 RK |
1186 | } |
1187 | ||
1188 | if (!s->s_root) { | |
1189 | char b[BDEVNAME_SIZE]; | |
1190 | ||
f11459ad RK |
1191 | s_new = true; |
1192 | ||
33c8e57c | 1193 | /* New superblock instance created */ |
783f6184 | 1194 | s->s_flags = flags; |
4571b82c | 1195 | s->s_mode = mode; |
783f6184 RK |
1196 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); |
1197 | sb_set_blocksize(s, block_size(sd.bdev)); | |
1198 | ||
348fe8da | 1199 | err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
783f6184 | 1200 | if (err) |
348fe8da | 1201 | goto failed_super; |
783f6184 RK |
1202 | |
1203 | s->s_flags |= MS_ACTIVE; | |
f11459ad RK |
1204 | } else if (!sd.cno) { |
1205 | int busy = false; | |
1206 | ||
1207 | if (nilfs_tree_was_touched(s->s_root)) { | |
1208 | busy = nilfs_try_to_shrink_tree(s->s_root); | |
1209 | if (busy && (flags ^ s->s_flags) & MS_RDONLY) { | |
1210 | printk(KERN_ERR "NILFS: the device already " | |
1211 | "has a %s mount.\n", | |
1212 | (s->s_flags & MS_RDONLY) ? | |
1213 | "read-only" : "read/write"); | |
1214 | err = -EBUSY; | |
1215 | goto failed_super; | |
1216 | } | |
1217 | } | |
1218 | if (!busy) { | |
1219 | /* | |
1220 | * Try remount to setup mount states if the current | |
1221 | * tree is not mounted and only snapshots use this sb. | |
1222 | */ | |
1223 | err = nilfs_remount(s, &flags, data); | |
1224 | if (err) | |
1225 | goto failed_super; | |
1226 | } | |
783f6184 RK |
1227 | } |
1228 | ||
f11459ad RK |
1229 | if (sd.cno) { |
1230 | err = nilfs_attach_snapshot(s, sd.cno, &root_dentry); | |
348fe8da | 1231 | if (err) |
f11459ad | 1232 | goto failed_super; |
f11459ad RK |
1233 | } else { |
1234 | root_dentry = dget(s->s_root); | |
783f6184 RK |
1235 | } |
1236 | ||
f11459ad | 1237 | if (!s_new) |
d4d77629 | 1238 | blkdev_put(sd.bdev, mode); |
783f6184 | 1239 | |
e4c59d61 | 1240 | return root_dentry; |
783f6184 | 1241 | |
f11459ad | 1242 | failed_super: |
a95161aa | 1243 | deactivate_locked_super(s); |
783f6184 | 1244 | |
348fe8da RK |
1245 | failed: |
1246 | if (!s_new) | |
d4d77629 | 1247 | blkdev_put(sd.bdev, mode); |
e4c59d61 | 1248 | return ERR_PTR(err); |
783f6184 RK |
1249 | } |
1250 | ||
783f6184 RK |
1251 | struct file_system_type nilfs_fs_type = { |
1252 | .owner = THIS_MODULE, | |
1253 | .name = "nilfs2", | |
e4c59d61 | 1254 | .mount = nilfs_mount, |
783f6184 RK |
1255 | .kill_sb = kill_block_super, |
1256 | .fs_flags = FS_REQUIRES_DEV, | |
1257 | }; | |
1258 | ||
41c88bd7 | 1259 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1260 | { |
41c88bd7 | 1261 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1262 | |
41c88bd7 LH |
1263 | INIT_LIST_HEAD(&ii->i_dirty); |
1264 | #ifdef CONFIG_NILFS_XATTR | |
1265 | init_rwsem(&ii->xattr_sem); | |
1266 | #endif | |
2aa15890 | 1267 | address_space_init_once(&ii->i_btnode_cache); |
05d0e94b | 1268 | ii->i_bmap = &ii->i_bmap_data; |
41c88bd7 LH |
1269 | inode_init_once(&ii->vfs_inode); |
1270 | } | |
783f6184 | 1271 | |
41c88bd7 LH |
1272 | static void nilfs_segbuf_init_once(void *obj) |
1273 | { | |
1274 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1275 | } | |
783f6184 | 1276 | |
41c88bd7 LH |
1277 | static void nilfs_destroy_cachep(void) |
1278 | { | |
84cb0999 | 1279 | if (nilfs_inode_cachep) |
41c88bd7 | 1280 | kmem_cache_destroy(nilfs_inode_cachep); |
84cb0999 | 1281 | if (nilfs_transaction_cachep) |
41c88bd7 | 1282 | kmem_cache_destroy(nilfs_transaction_cachep); |
84cb0999 | 1283 | if (nilfs_segbuf_cachep) |
41c88bd7 | 1284 | kmem_cache_destroy(nilfs_segbuf_cachep); |
84cb0999 | 1285 | if (nilfs_btree_path_cache) |
41c88bd7 LH |
1286 | kmem_cache_destroy(nilfs_btree_path_cache); |
1287 | } | |
783f6184 | 1288 | |
41c88bd7 LH |
1289 | static int __init nilfs_init_cachep(void) |
1290 | { | |
1291 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1292 | sizeof(struct nilfs_inode_info), 0, | |
1293 | SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once); | |
1294 | if (!nilfs_inode_cachep) | |
1295 | goto fail; | |
1296 | ||
1297 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1298 | sizeof(struct nilfs_transaction_info), 0, | |
1299 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1300 | if (!nilfs_transaction_cachep) | |
1301 | goto fail; | |
1302 | ||
1303 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1304 | sizeof(struct nilfs_segment_buffer), 0, | |
1305 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1306 | if (!nilfs_segbuf_cachep) | |
1307 | goto fail; | |
1308 | ||
1309 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1310 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1311 | 0, 0, NULL); | |
1312 | if (!nilfs_btree_path_cache) | |
1313 | goto fail; | |
783f6184 RK |
1314 | |
1315 | return 0; | |
1316 | ||
41c88bd7 LH |
1317 | fail: |
1318 | nilfs_destroy_cachep(); | |
1319 | return -ENOMEM; | |
1320 | } | |
1321 | ||
1322 | static int __init init_nilfs_fs(void) | |
1323 | { | |
1324 | int err; | |
783f6184 | 1325 | |
41c88bd7 LH |
1326 | err = nilfs_init_cachep(); |
1327 | if (err) | |
1328 | goto fail; | |
783f6184 | 1329 | |
41c88bd7 LH |
1330 | err = register_filesystem(&nilfs_fs_type); |
1331 | if (err) | |
1332 | goto free_cachep; | |
783f6184 | 1333 | |
9f130263 | 1334 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1335 | return 0; |
783f6184 | 1336 | |
41c88bd7 LH |
1337 | free_cachep: |
1338 | nilfs_destroy_cachep(); | |
1339 | fail: | |
783f6184 RK |
1340 | return err; |
1341 | } | |
1342 | ||
1343 | static void __exit exit_nilfs_fs(void) | |
1344 | { | |
41c88bd7 | 1345 | nilfs_destroy_cachep(); |
783f6184 RK |
1346 | unregister_filesystem(&nilfs_fs_type); |
1347 | } | |
1348 | ||
1349 | module_init(init_nilfs_fs) | |
1350 | module_exit(exit_nilfs_fs) |