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Commit | Line | Data |
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783f6184 RK |
1 | /* |
2 | * super.c - NILFS module and super block management. | |
3 | * | |
4 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | * | |
20 | * Written by Ryusuke Konishi <ryusuke@osrg.net> | |
21 | */ | |
22 | /* | |
23 | * linux/fs/ext2/super.c | |
24 | * | |
25 | * Copyright (C) 1992, 1993, 1994, 1995 | |
26 | * Remy Card (card@masi.ibp.fr) | |
27 | * Laboratoire MASI - Institut Blaise Pascal | |
28 | * Universite Pierre et Marie Curie (Paris VI) | |
29 | * | |
30 | * from | |
31 | * | |
32 | * linux/fs/minix/inode.c | |
33 | * | |
34 | * Copyright (C) 1991, 1992 Linus Torvalds | |
35 | * | |
36 | * Big-endian to little-endian byte-swapping/bitmaps by | |
37 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
38 | */ | |
39 | ||
40 | #include <linux/module.h> | |
41 | #include <linux/string.h> | |
42 | #include <linux/slab.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/blkdev.h> | |
45 | #include <linux/parser.h> | |
46 | #include <linux/random.h> | |
47 | #include <linux/crc32.h> | |
783f6184 RK |
48 | #include <linux/vfs.h> |
49 | #include <linux/writeback.h> | |
50 | #include <linux/kobject.h> | |
b58a285b JS |
51 | #include <linux/seq_file.h> |
52 | #include <linux/mount.h> | |
783f6184 | 53 | #include "nilfs.h" |
8e656fd5 | 54 | #include "export.h" |
783f6184 RK |
55 | #include "mdt.h" |
56 | #include "alloc.h" | |
05d0e94b RK |
57 | #include "btree.h" |
58 | #include "btnode.h" | |
783f6184 RK |
59 | #include "page.h" |
60 | #include "cpfile.h" | |
61 | #include "ifile.h" | |
62 | #include "dat.h" | |
63 | #include "segment.h" | |
64 | #include "segbuf.h" | |
65 | ||
66 | MODULE_AUTHOR("NTT Corp."); | |
67 | MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem " | |
68 | "(NILFS)"); | |
783f6184 RK |
69 | MODULE_LICENSE("GPL"); |
70 | ||
abc0b50b | 71 | static struct kmem_cache *nilfs_inode_cachep; |
41c88bd7 LH |
72 | struct kmem_cache *nilfs_transaction_cachep; |
73 | struct kmem_cache *nilfs_segbuf_cachep; | |
74 | struct kmem_cache *nilfs_btree_path_cache; | |
75 | ||
5beb6e0b | 76 | static int nilfs_setup_super(struct nilfs_sb_info *sbi, int is_mount); |
783f6184 | 77 | static int nilfs_remount(struct super_block *sb, int *flags, char *data); |
783f6184 | 78 | |
c8a11c8a RK |
79 | static void nilfs_set_error(struct nilfs_sb_info *sbi) |
80 | { | |
81 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 | 82 | struct nilfs_super_block **sbp; |
c8a11c8a RK |
83 | |
84 | down_write(&nilfs->ns_sem); | |
85 | if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { | |
86 | nilfs->ns_mount_state |= NILFS_ERROR_FS; | |
b2ac86e1 | 87 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
88 | if (likely(sbp)) { |
89 | sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
b2ac86e1 JS |
90 | if (sbp[1]) |
91 | sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
92 | nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL); | |
d26493b6 | 93 | } |
c8a11c8a RK |
94 | } |
95 | up_write(&nilfs->ns_sem); | |
96 | } | |
97 | ||
783f6184 RK |
98 | /** |
99 | * nilfs_error() - report failure condition on a filesystem | |
100 | * | |
101 | * nilfs_error() sets an ERROR_FS flag on the superblock as well as | |
102 | * reporting an error message. It should be called when NILFS detects | |
103 | * incoherences or defects of meta data on disk. As for sustainable | |
104 | * errors such as a single-shot I/O error, nilfs_warning() or the printk() | |
105 | * function should be used instead. | |
106 | * | |
107 | * The segment constructor must not call this function because it can | |
108 | * kill itself. | |
109 | */ | |
110 | void nilfs_error(struct super_block *sb, const char *function, | |
111 | const char *fmt, ...) | |
112 | { | |
113 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
114 | va_list args; | |
115 | ||
116 | va_start(args, fmt); | |
117 | printk(KERN_CRIT "NILFS error (device %s): %s: ", sb->s_id, function); | |
118 | vprintk(fmt, args); | |
119 | printk("\n"); | |
120 | va_end(args); | |
121 | ||
122 | if (!(sb->s_flags & MS_RDONLY)) { | |
c8a11c8a | 123 | nilfs_set_error(sbi); |
783f6184 RK |
124 | |
125 | if (nilfs_test_opt(sbi, ERRORS_RO)) { | |
126 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
127 | sb->s_flags |= MS_RDONLY; | |
128 | } | |
129 | } | |
130 | ||
131 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) | |
132 | panic("NILFS (device %s): panic forced after error\n", | |
133 | sb->s_id); | |
134 | } | |
135 | ||
136 | void nilfs_warning(struct super_block *sb, const char *function, | |
137 | const char *fmt, ...) | |
138 | { | |
139 | va_list args; | |
140 | ||
141 | va_start(args, fmt); | |
142 | printk(KERN_WARNING "NILFS warning (device %s): %s: ", | |
143 | sb->s_id, function); | |
144 | vprintk(fmt, args); | |
145 | printk("\n"); | |
146 | va_end(args); | |
147 | } | |
148 | ||
783f6184 | 149 | |
2879ed66 | 150 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
783f6184 RK |
151 | { |
152 | struct nilfs_inode_info *ii; | |
153 | ||
154 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); | |
155 | if (!ii) | |
156 | return NULL; | |
157 | ii->i_bh = NULL; | |
158 | ii->i_state = 0; | |
0e14a359 | 159 | ii->i_cno = 0; |
783f6184 | 160 | ii->vfs_inode.i_version = 1; |
2879ed66 | 161 | nilfs_btnode_cache_init(&ii->i_btnode_cache, sb->s_bdi); |
783f6184 RK |
162 | return &ii->vfs_inode; |
163 | } | |
164 | ||
165 | void nilfs_destroy_inode(struct inode *inode) | |
166 | { | |
b91c9a97 RK |
167 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
168 | ||
169 | if (mdi) { | |
170 | kfree(mdi->mi_bgl); /* kfree(NULL) is safe */ | |
171 | kfree(mdi); | |
172 | } | |
783f6184 RK |
173 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
174 | } | |
175 | ||
b2ac86e1 | 176 | static int nilfs_sync_super(struct nilfs_sb_info *sbi, int flag) |
783f6184 RK |
177 | { |
178 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
179 | int err; | |
783f6184 | 180 | |
783f6184 | 181 | retry: |
e339ad31 | 182 | set_buffer_dirty(nilfs->ns_sbh[0]); |
87e99511 CH |
183 | if (nilfs_test_opt(sbi, BARRIER)) { |
184 | err = __sync_dirty_buffer(nilfs->ns_sbh[0], | |
f8c131f5 | 185 | WRITE_SYNC | WRITE_FLUSH_FUA); |
87e99511 CH |
186 | } else { |
187 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); | |
783f6184 | 188 | } |
87e99511 | 189 | |
e339ad31 | 190 | if (unlikely(err)) { |
783f6184 RK |
191 | printk(KERN_ERR |
192 | "NILFS: unable to write superblock (err=%d)\n", err); | |
e339ad31 | 193 | if (err == -EIO && nilfs->ns_sbh[1]) { |
b2ac86e1 JS |
194 | /* |
195 | * sbp[0] points to newer log than sbp[1], | |
196 | * so copy sbp[0] to sbp[1] to take over sbp[0]. | |
197 | */ | |
198 | memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0], | |
199 | nilfs->ns_sbsize); | |
e339ad31 RK |
200 | nilfs_fall_back_super_block(nilfs); |
201 | goto retry; | |
202 | } | |
203 | } else { | |
204 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; | |
205 | ||
b2ac86e1 JS |
206 | nilfs->ns_sbwcount++; |
207 | ||
e339ad31 RK |
208 | /* |
209 | * The latest segment becomes trailable from the position | |
210 | * written in superblock. | |
211 | */ | |
783f6184 | 212 | clear_nilfs_discontinued(nilfs); |
e339ad31 RK |
213 | |
214 | /* update GC protection for recent segments */ | |
215 | if (nilfs->ns_sbh[1]) { | |
b2ac86e1 | 216 | if (flag == NILFS_SB_COMMIT_ALL) { |
e339ad31 | 217 | set_buffer_dirty(nilfs->ns_sbh[1]); |
b2ac86e1 JS |
218 | if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0) |
219 | goto out; | |
e339ad31 | 220 | } |
b2ac86e1 JS |
221 | if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) < |
222 | le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno)) | |
223 | sbp = nilfs->ns_sbp[1]; | |
e339ad31 | 224 | } |
783f6184 | 225 | |
b2ac86e1 JS |
226 | spin_lock(&nilfs->ns_last_segment_lock); |
227 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); | |
228 | spin_unlock(&nilfs->ns_last_segment_lock); | |
229 | } | |
230 | out: | |
783f6184 RK |
231 | return err; |
232 | } | |
233 | ||
60f46b7e RK |
234 | void nilfs_set_log_cursor(struct nilfs_super_block *sbp, |
235 | struct the_nilfs *nilfs) | |
236 | { | |
237 | sector_t nfreeblocks; | |
238 | ||
239 | /* nilfs->ns_sem must be locked by the caller. */ | |
240 | nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
241 | sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
242 | ||
243 | spin_lock(&nilfs->ns_last_segment_lock); | |
244 | sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
245 | sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
246 | sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
247 | spin_unlock(&nilfs->ns_last_segment_lock); | |
248 | } | |
249 | ||
b2ac86e1 JS |
250 | struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *sbi, |
251 | int flip) | |
783f6184 RK |
252 | { |
253 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
e339ad31 | 254 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 255 | |
d26493b6 | 256 | /* nilfs->ns_sem must be locked by the caller. */ |
34cb9b5c | 257 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
d26493b6 JS |
258 | if (sbp[1] && |
259 | sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
b2ac86e1 | 260 | memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); |
d26493b6 | 261 | } else { |
e339ad31 RK |
262 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", |
263 | sbi->s_super->s_id); | |
d26493b6 | 264 | return NULL; |
e339ad31 | 265 | } |
b2ac86e1 JS |
266 | } else if (sbp[1] && |
267 | sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
268 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
e339ad31 | 269 | } |
b2ac86e1 JS |
270 | |
271 | if (flip && sbp[1]) | |
272 | nilfs_swap_super_block(nilfs); | |
273 | ||
d26493b6 JS |
274 | return sbp; |
275 | } | |
276 | ||
b2ac86e1 | 277 | int nilfs_commit_super(struct nilfs_sb_info *sbi, int flag) |
d26493b6 JS |
278 | { |
279 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
280 | struct nilfs_super_block **sbp = nilfs->ns_sbp; | |
281 | time_t t; | |
282 | ||
283 | /* nilfs->ns_sem must be locked by the caller. */ | |
e339ad31 | 284 | t = get_seconds(); |
b2ac86e1 | 285 | nilfs->ns_sbwtime = t; |
e339ad31 RK |
286 | sbp[0]->s_wtime = cpu_to_le64(t); |
287 | sbp[0]->s_sum = 0; | |
288 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
289 | (unsigned char *)sbp[0], | |
290 | nilfs->ns_sbsize)); | |
b2ac86e1 JS |
291 | if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) { |
292 | sbp[1]->s_wtime = sbp[0]->s_wtime; | |
293 | sbp[1]->s_sum = 0; | |
294 | sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
295 | (unsigned char *)sbp[1], | |
296 | nilfs->ns_sbsize)); | |
e339ad31 | 297 | } |
e605f0a7 | 298 | clear_nilfs_sb_dirty(nilfs); |
b2ac86e1 | 299 | return nilfs_sync_super(sbi, flag); |
783f6184 RK |
300 | } |
301 | ||
7ecaa46c RK |
302 | /** |
303 | * nilfs_cleanup_super() - write filesystem state for cleanup | |
304 | * @sbi: nilfs_sb_info to be unmounted or degraded to read-only | |
305 | * | |
306 | * This function restores state flags in the on-disk super block. | |
307 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the | |
308 | * filesystem was not clean previously. | |
309 | */ | |
310 | int nilfs_cleanup_super(struct nilfs_sb_info *sbi) | |
311 | { | |
d26493b6 | 312 | struct nilfs_super_block **sbp; |
b2ac86e1 | 313 | int flag = NILFS_SB_COMMIT; |
d26493b6 | 314 | int ret = -EIO; |
7ecaa46c | 315 | |
b2ac86e1 | 316 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
317 | if (sbp) { |
318 | sbp[0]->s_state = cpu_to_le16(sbi->s_nilfs->ns_mount_state); | |
b2ac86e1 JS |
319 | nilfs_set_log_cursor(sbp[0], sbi->s_nilfs); |
320 | if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { | |
321 | /* | |
322 | * make the "clean" flag also to the opposite | |
323 | * super block if both super blocks point to | |
324 | * the same checkpoint. | |
325 | */ | |
326 | sbp[1]->s_state = sbp[0]->s_state; | |
327 | flag = NILFS_SB_COMMIT_ALL; | |
328 | } | |
329 | ret = nilfs_commit_super(sbi, flag); | |
d26493b6 | 330 | } |
7ecaa46c RK |
331 | return ret; |
332 | } | |
333 | ||
783f6184 RK |
334 | static void nilfs_put_super(struct super_block *sb) |
335 | { | |
336 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
337 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
338 | ||
339 | nilfs_detach_segment_constructor(sbi); | |
340 | ||
341 | if (!(sb->s_flags & MS_RDONLY)) { | |
342 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 343 | nilfs_cleanup_super(sbi); |
783f6184 RK |
344 | up_write(&nilfs->ns_sem); |
345 | } | |
346 | ||
f1e89c86 RK |
347 | iput(nilfs->ns_sufile); |
348 | iput(nilfs->ns_cpfile); | |
349 | iput(nilfs->ns_dat); | |
350 | ||
348fe8da | 351 | destroy_nilfs(nilfs); |
783f6184 RK |
352 | sbi->s_super = NULL; |
353 | sb->s_fs_info = NULL; | |
f11459ad | 354 | kfree(sbi); |
783f6184 RK |
355 | } |
356 | ||
783f6184 RK |
357 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
358 | { | |
6233caa9 JS |
359 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
360 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 | 361 | struct nilfs_super_block **sbp; |
783f6184 RK |
362 | int err = 0; |
363 | ||
364 | /* This function is called when super block should be written back */ | |
365 | if (wait) | |
366 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
367 | |
368 | down_write(&nilfs->ns_sem); | |
d26493b6 | 369 | if (nilfs_sb_dirty(nilfs)) { |
b2ac86e1 JS |
370 | sbp = nilfs_prepare_super(sbi, nilfs_sb_will_flip(nilfs)); |
371 | if (likely(sbp)) { | |
372 | nilfs_set_log_cursor(sbp[0], nilfs); | |
373 | nilfs_commit_super(sbi, NILFS_SB_COMMIT); | |
374 | } | |
d26493b6 | 375 | } |
6233caa9 JS |
376 | up_write(&nilfs->ns_sem); |
377 | ||
783f6184 RK |
378 | return err; |
379 | } | |
380 | ||
4d8d9293 RK |
381 | int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno, int curr_mnt, |
382 | struct nilfs_root **rootp) | |
783f6184 RK |
383 | { |
384 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
4d8d9293 | 385 | struct nilfs_root *root; |
783f6184 RK |
386 | struct nilfs_checkpoint *raw_cp; |
387 | struct buffer_head *bh_cp; | |
4d8d9293 | 388 | int err = -ENOMEM; |
783f6184 | 389 | |
4d8d9293 RK |
390 | root = nilfs_find_or_create_root( |
391 | nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); | |
392 | if (!root) | |
393 | return err; | |
783f6184 | 394 | |
e912a5b6 RK |
395 | if (root->ifile) |
396 | goto reuse; /* already attached checkpoint */ | |
783f6184 | 397 | |
1154ecbd | 398 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
399 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
400 | &bh_cp); | |
1154ecbd | 401 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
402 | if (unlikely(err)) { |
403 | if (err == -ENOENT || err == -EINVAL) { | |
404 | printk(KERN_ERR | |
405 | "NILFS: Invalid checkpoint " | |
406 | "(checkpoint number=%llu)\n", | |
407 | (unsigned long long)cno); | |
408 | err = -EINVAL; | |
409 | } | |
410 | goto failed; | |
411 | } | |
f1e89c86 RK |
412 | |
413 | err = nilfs_ifile_read(sbi->s_super, root, nilfs->ns_inode_size, | |
414 | &raw_cp->cp_ifile_inode, &root->ifile); | |
415 | if (err) | |
783f6184 | 416 | goto failed_bh; |
b7c06342 RK |
417 | |
418 | atomic_set(&root->inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); | |
419 | atomic_set(&root->blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); | |
783f6184 RK |
420 | |
421 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
4d8d9293 | 422 | |
e912a5b6 | 423 | reuse: |
4d8d9293 | 424 | *rootp = root; |
783f6184 RK |
425 | return 0; |
426 | ||
427 | failed_bh: | |
428 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
429 | failed: | |
4d8d9293 | 430 | nilfs_put_root(root); |
783f6184 RK |
431 | |
432 | return err; | |
433 | } | |
783f6184 | 434 | |
5beb6e0b RK |
435 | static int nilfs_freeze(struct super_block *sb) |
436 | { | |
437 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
438 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
439 | int err; | |
440 | ||
441 | if (sb->s_flags & MS_RDONLY) | |
442 | return 0; | |
783f6184 | 443 | |
5beb6e0b RK |
444 | /* Mark super block clean */ |
445 | down_write(&nilfs->ns_sem); | |
446 | err = nilfs_cleanup_super(sbi); | |
447 | up_write(&nilfs->ns_sem); | |
783f6184 RK |
448 | return err; |
449 | } | |
450 | ||
5beb6e0b | 451 | static int nilfs_unfreeze(struct super_block *sb) |
783f6184 | 452 | { |
5beb6e0b | 453 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
783f6184 RK |
454 | struct the_nilfs *nilfs = sbi->s_nilfs; |
455 | ||
5beb6e0b RK |
456 | if (sb->s_flags & MS_RDONLY) |
457 | return 0; | |
458 | ||
459 | down_write(&nilfs->ns_sem); | |
460 | nilfs_setup_super(sbi, false); | |
461 | up_write(&nilfs->ns_sem); | |
462 | return 0; | |
783f6184 RK |
463 | } |
464 | ||
783f6184 RK |
465 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
466 | { | |
467 | struct super_block *sb = dentry->d_sb; | |
b7c06342 RK |
468 | struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root; |
469 | struct the_nilfs *nilfs = root->nilfs; | |
c306af23 | 470 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
783f6184 RK |
471 | unsigned long long blocks; |
472 | unsigned long overhead; | |
473 | unsigned long nrsvblocks; | |
474 | sector_t nfreeblocks; | |
783f6184 RK |
475 | int err; |
476 | ||
477 | /* | |
478 | * Compute all of the segment blocks | |
479 | * | |
480 | * The blocks before first segment and after last segment | |
481 | * are excluded. | |
482 | */ | |
483 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
484 | - nilfs->ns_first_data_block; | |
485 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
486 | ||
487 | /* | |
488 | * Compute the overhead | |
489 | * | |
7a65004b | 490 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
491 | * We must count them as the overhead. |
492 | */ | |
493 | overhead = 0; | |
494 | ||
495 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
496 | if (unlikely(err)) | |
497 | return err; | |
498 | ||
499 | buf->f_type = NILFS_SUPER_MAGIC; | |
500 | buf->f_bsize = sb->s_blocksize; | |
501 | buf->f_blocks = blocks - overhead; | |
502 | buf->f_bfree = nfreeblocks; | |
503 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
504 | (buf->f_bfree - nrsvblocks) : 0; | |
b7c06342 | 505 | buf->f_files = atomic_read(&root->inodes_count); |
783f6184 RK |
506 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ |
507 | buf->f_namelen = NILFS_NAME_LEN; | |
c306af23 RK |
508 | buf->f_fsid.val[0] = (u32)id; |
509 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
510 | ||
783f6184 RK |
511 | return 0; |
512 | } | |
513 | ||
b58a285b JS |
514 | static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
515 | { | |
516 | struct super_block *sb = vfs->mnt_sb; | |
517 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
f11459ad | 518 | struct nilfs_root *root = NILFS_I(vfs->mnt_root->d_inode)->i_root; |
b58a285b JS |
519 | |
520 | if (!nilfs_test_opt(sbi, BARRIER)) | |
c6b4d57d | 521 | seq_puts(seq, ",nobarrier"); |
f11459ad RK |
522 | if (root->cno != NILFS_CPTREE_CURRENT_CNO) |
523 | seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno); | |
b58a285b | 524 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) |
c6b4d57d | 525 | seq_puts(seq, ",errors=panic"); |
277a6a34 | 526 | if (nilfs_test_opt(sbi, ERRORS_CONT)) |
c6b4d57d | 527 | seq_puts(seq, ",errors=continue"); |
b58a285b | 528 | if (nilfs_test_opt(sbi, STRICT_ORDER)) |
c6b4d57d | 529 | seq_puts(seq, ",order=strict"); |
0234576d | 530 | if (nilfs_test_opt(sbi, NORECOVERY)) |
c6b4d57d | 531 | seq_puts(seq, ",norecovery"); |
e902ec99 | 532 | if (nilfs_test_opt(sbi, DISCARD)) |
c6b4d57d | 533 | seq_puts(seq, ",discard"); |
b58a285b JS |
534 | |
535 | return 0; | |
536 | } | |
537 | ||
b87221de | 538 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
539 | .alloc_inode = nilfs_alloc_inode, |
540 | .destroy_inode = nilfs_destroy_inode, | |
541 | .dirty_inode = nilfs_dirty_inode, | |
542 | /* .write_inode = nilfs_write_inode, */ | |
543 | /* .put_inode = nilfs_put_inode, */ | |
544 | /* .drop_inode = nilfs_drop_inode, */ | |
6fd1e5c9 | 545 | .evict_inode = nilfs_evict_inode, |
783f6184 | 546 | .put_super = nilfs_put_super, |
1dfa2710 | 547 | /* .write_super = nilfs_write_super, */ |
783f6184 | 548 | .sync_fs = nilfs_sync_fs, |
5beb6e0b RK |
549 | .freeze_fs = nilfs_freeze, |
550 | .unfreeze_fs = nilfs_unfreeze, | |
783f6184 RK |
551 | /* .write_super_lockfs */ |
552 | /* .unlockfs */ | |
553 | .statfs = nilfs_statfs, | |
554 | .remount_fs = nilfs_remount, | |
783f6184 | 555 | /* .umount_begin */ |
b58a285b | 556 | .show_options = nilfs_show_options |
783f6184 RK |
557 | }; |
558 | ||
783f6184 RK |
559 | enum { |
560 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
773bc4f3 | 561 | Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
802d3177 | 562 | Opt_discard, Opt_nodiscard, Opt_err, |
783f6184 RK |
563 | }; |
564 | ||
565 | static match_table_t tokens = { | |
566 | {Opt_err_cont, "errors=continue"}, | |
567 | {Opt_err_panic, "errors=panic"}, | |
568 | {Opt_err_ro, "errors=remount-ro"}, | |
773bc4f3 | 569 | {Opt_barrier, "barrier"}, |
91f1953b | 570 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
571 | {Opt_snapshot, "cp=%u"}, |
572 | {Opt_order, "order=%s"}, | |
0234576d | 573 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 574 | {Opt_discard, "discard"}, |
802d3177 | 575 | {Opt_nodiscard, "nodiscard"}, |
783f6184 RK |
576 | {Opt_err, NULL} |
577 | }; | |
578 | ||
7c017457 | 579 | static int parse_options(char *options, struct super_block *sb, int is_remount) |
783f6184 RK |
580 | { |
581 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
582 | char *p; | |
583 | substring_t args[MAX_OPT_ARGS]; | |
783f6184 RK |
584 | |
585 | if (!options) | |
586 | return 1; | |
587 | ||
588 | while ((p = strsep(&options, ",")) != NULL) { | |
589 | int token; | |
590 | if (!*p) | |
591 | continue; | |
592 | ||
593 | token = match_token(p, tokens, args); | |
594 | switch (token) { | |
773bc4f3 RK |
595 | case Opt_barrier: |
596 | nilfs_set_opt(sbi, BARRIER); | |
597 | break; | |
91f1953b JS |
598 | case Opt_nobarrier: |
599 | nilfs_clear_opt(sbi, BARRIER); | |
783f6184 RK |
600 | break; |
601 | case Opt_order: | |
602 | if (strcmp(args[0].from, "relaxed") == 0) | |
603 | /* Ordered data semantics */ | |
604 | nilfs_clear_opt(sbi, STRICT_ORDER); | |
605 | else if (strcmp(args[0].from, "strict") == 0) | |
606 | /* Strict in-order semantics */ | |
607 | nilfs_set_opt(sbi, STRICT_ORDER); | |
608 | else | |
609 | return 0; | |
610 | break; | |
611 | case Opt_err_panic: | |
612 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC); | |
613 | break; | |
614 | case Opt_err_ro: | |
615 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO); | |
616 | break; | |
617 | case Opt_err_cont: | |
618 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT); | |
619 | break; | |
620 | case Opt_snapshot: | |
7c017457 | 621 | if (is_remount) { |
f11459ad RK |
622 | printk(KERN_ERR |
623 | "NILFS: \"%s\" option is invalid " | |
624 | "for remount.\n", p); | |
783f6184 | 625 | return 0; |
7c017457 | 626 | } |
783f6184 | 627 | break; |
0234576d RK |
628 | case Opt_norecovery: |
629 | nilfs_set_opt(sbi, NORECOVERY); | |
630 | break; | |
e902ec99 JS |
631 | case Opt_discard: |
632 | nilfs_set_opt(sbi, DISCARD); | |
633 | break; | |
802d3177 RK |
634 | case Opt_nodiscard: |
635 | nilfs_clear_opt(sbi, DISCARD); | |
636 | break; | |
783f6184 RK |
637 | default: |
638 | printk(KERN_ERR | |
639 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
640 | return 0; | |
641 | } | |
642 | } | |
643 | return 1; | |
644 | } | |
645 | ||
646 | static inline void | |
647 | nilfs_set_default_options(struct nilfs_sb_info *sbi, | |
648 | struct nilfs_super_block *sbp) | |
649 | { | |
650 | sbi->s_mount_opt = | |
277a6a34 | 651 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
652 | } |
653 | ||
5beb6e0b | 654 | static int nilfs_setup_super(struct nilfs_sb_info *sbi, int is_mount) |
783f6184 RK |
655 | { |
656 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 JS |
657 | struct nilfs_super_block **sbp; |
658 | int max_mnt_count; | |
659 | int mnt_count; | |
660 | ||
661 | /* nilfs->ns_sem must be locked by the caller. */ | |
b2ac86e1 | 662 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
663 | if (!sbp) |
664 | return -EIO; | |
665 | ||
5beb6e0b RK |
666 | if (!is_mount) |
667 | goto skip_mount_setup; | |
668 | ||
d26493b6 JS |
669 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); |
670 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); | |
783f6184 | 671 | |
f50a4c81 | 672 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
783f6184 RK |
673 | printk(KERN_WARNING |
674 | "NILFS warning: mounting fs with errors\n"); | |
675 | #if 0 | |
676 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
677 | printk(KERN_WARNING | |
678 | "NILFS warning: maximal mount count reached\n"); | |
679 | #endif | |
680 | } | |
681 | if (!max_mnt_count) | |
d26493b6 | 682 | sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
783f6184 | 683 | |
d26493b6 | 684 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
5beb6e0b RK |
685 | sbp[0]->s_mtime = cpu_to_le64(get_seconds()); |
686 | ||
687 | skip_mount_setup: | |
d26493b6 JS |
688 | sbp[0]->s_state = |
689 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); | |
b2ac86e1 JS |
690 | /* synchronize sbp[1] with sbp[0] */ |
691 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
692 | return nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL); | |
783f6184 RK |
693 | } |
694 | ||
e339ad31 RK |
695 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
696 | u64 pos, int blocksize, | |
697 | struct buffer_head **pbh) | |
783f6184 | 698 | { |
e339ad31 RK |
699 | unsigned long long sb_index = pos; |
700 | unsigned long offset; | |
783f6184 | 701 | |
e339ad31 | 702 | offset = do_div(sb_index, blocksize); |
783f6184 | 703 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 704 | if (!*pbh) |
783f6184 | 705 | return NULL; |
783f6184 RK |
706 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
707 | } | |
708 | ||
783f6184 RK |
709 | int nilfs_store_magic_and_option(struct super_block *sb, |
710 | struct nilfs_super_block *sbp, | |
711 | char *data) | |
712 | { | |
713 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
714 | ||
783f6184 RK |
715 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
716 | ||
717 | /* FS independent flags */ | |
718 | #ifdef NILFS_ATIME_DISABLE | |
719 | sb->s_flags |= MS_NOATIME; | |
720 | #endif | |
721 | ||
783f6184 RK |
722 | nilfs_set_default_options(sbi, sbp); |
723 | ||
724 | sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid); | |
725 | sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid); | |
726 | sbi->s_interval = le32_to_cpu(sbp->s_c_interval); | |
727 | sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max); | |
728 | ||
7c017457 | 729 | return !parse_options(data, sb, 0) ? -EINVAL : 0 ; |
783f6184 RK |
730 | } |
731 | ||
c5ca48aa RK |
732 | int nilfs_check_feature_compatibility(struct super_block *sb, |
733 | struct nilfs_super_block *sbp) | |
734 | { | |
735 | __u64 features; | |
736 | ||
737 | features = le64_to_cpu(sbp->s_feature_incompat) & | |
738 | ~NILFS_FEATURE_INCOMPAT_SUPP; | |
739 | if (features) { | |
740 | printk(KERN_ERR "NILFS: couldn't mount because of unsupported " | |
741 | "optional features (%llx)\n", | |
742 | (unsigned long long)features); | |
743 | return -EINVAL; | |
744 | } | |
745 | features = le64_to_cpu(sbp->s_feature_compat_ro) & | |
746 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
747 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
748 | printk(KERN_ERR "NILFS: couldn't mount RDWR because of " | |
749 | "unsupported optional features (%llx)\n", | |
750 | (unsigned long long)features); | |
751 | return -EINVAL; | |
752 | } | |
753 | return 0; | |
754 | } | |
755 | ||
367ea334 RK |
756 | static int nilfs_get_root_dentry(struct super_block *sb, |
757 | struct nilfs_root *root, | |
758 | struct dentry **root_dentry) | |
759 | { | |
760 | struct inode *inode; | |
761 | struct dentry *dentry; | |
762 | int ret = 0; | |
763 | ||
764 | inode = nilfs_iget(sb, root, NILFS_ROOT_INO); | |
765 | if (IS_ERR(inode)) { | |
766 | printk(KERN_ERR "NILFS: get root inode failed\n"); | |
767 | ret = PTR_ERR(inode); | |
768 | goto out; | |
769 | } | |
770 | if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { | |
771 | iput(inode); | |
772 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); | |
773 | ret = -EINVAL; | |
774 | goto out; | |
775 | } | |
776 | ||
f11459ad RK |
777 | if (root->cno == NILFS_CPTREE_CURRENT_CNO) { |
778 | dentry = d_find_alias(inode); | |
779 | if (!dentry) { | |
780 | dentry = d_alloc_root(inode); | |
781 | if (!dentry) { | |
782 | iput(inode); | |
783 | ret = -ENOMEM; | |
784 | goto failed_dentry; | |
785 | } | |
786 | } else { | |
787 | iput(inode); | |
788 | } | |
789 | } else { | |
790 | dentry = d_obtain_alias(inode); | |
791 | if (IS_ERR(dentry)) { | |
792 | ret = PTR_ERR(dentry); | |
793 | goto failed_dentry; | |
794 | } | |
367ea334 RK |
795 | } |
796 | *root_dentry = dentry; | |
797 | out: | |
798 | return ret; | |
f11459ad RK |
799 | |
800 | failed_dentry: | |
801 | printk(KERN_ERR "NILFS: get root dentry failed\n"); | |
802 | goto out; | |
367ea334 RK |
803 | } |
804 | ||
ab4d8f7e RK |
805 | static int nilfs_attach_snapshot(struct super_block *s, __u64 cno, |
806 | struct dentry **root_dentry) | |
807 | { | |
808 | struct the_nilfs *nilfs = NILFS_SB(s)->s_nilfs; | |
809 | struct nilfs_root *root; | |
810 | int ret; | |
811 | ||
812 | down_read(&nilfs->ns_segctor_sem); | |
813 | ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno); | |
814 | up_read(&nilfs->ns_segctor_sem); | |
815 | if (ret < 0) { | |
816 | ret = (ret == -ENOENT) ? -EINVAL : ret; | |
817 | goto out; | |
818 | } else if (!ret) { | |
819 | printk(KERN_ERR "NILFS: The specified checkpoint is " | |
820 | "not a snapshot (checkpoint number=%llu).\n", | |
821 | (unsigned long long)cno); | |
822 | ret = -EINVAL; | |
823 | goto out; | |
824 | } | |
825 | ||
826 | ret = nilfs_attach_checkpoint(NILFS_SB(s), cno, false, &root); | |
827 | if (ret) { | |
828 | printk(KERN_ERR "NILFS: error loading snapshot " | |
829 | "(checkpoint number=%llu).\n", | |
830 | (unsigned long long)cno); | |
831 | goto out; | |
832 | } | |
833 | ret = nilfs_get_root_dentry(s, root, root_dentry); | |
834 | nilfs_put_root(root); | |
835 | out: | |
836 | return ret; | |
837 | } | |
838 | ||
f11459ad RK |
839 | static int nilfs_tree_was_touched(struct dentry *root_dentry) |
840 | { | |
841 | return atomic_read(&root_dentry->d_count) > 1; | |
842 | } | |
843 | ||
844 | /** | |
845 | * nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint | |
846 | * @root_dentry: root dentry of the tree to be shrunk | |
847 | * | |
848 | * This function returns true if the tree was in-use. | |
849 | */ | |
850 | static int nilfs_try_to_shrink_tree(struct dentry *root_dentry) | |
851 | { | |
852 | if (have_submounts(root_dentry)) | |
853 | return true; | |
854 | shrink_dcache_parent(root_dentry); | |
855 | return nilfs_tree_was_touched(root_dentry); | |
856 | } | |
857 | ||
032dbb3b RK |
858 | int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno) |
859 | { | |
860 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; | |
861 | struct nilfs_root *root; | |
862 | struct inode *inode; | |
863 | struct dentry *dentry; | |
864 | int ret; | |
865 | ||
866 | if (cno < 0 || cno > nilfs->ns_cno) | |
867 | return false; | |
868 | ||
869 | if (cno >= nilfs_last_cno(nilfs)) | |
870 | return true; /* protect recent checkpoints */ | |
871 | ||
872 | ret = false; | |
873 | root = nilfs_lookup_root(NILFS_SB(sb)->s_nilfs, cno); | |
874 | if (root) { | |
875 | inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO); | |
876 | if (inode) { | |
877 | dentry = d_find_alias(inode); | |
878 | if (dentry) { | |
879 | if (nilfs_tree_was_touched(dentry)) | |
880 | ret = nilfs_try_to_shrink_tree(dentry); | |
881 | dput(dentry); | |
882 | } | |
883 | iput(inode); | |
884 | } | |
885 | nilfs_put_root(root); | |
886 | } | |
887 | return ret; | |
888 | } | |
889 | ||
783f6184 RK |
890 | /** |
891 | * nilfs_fill_super() - initialize a super block instance | |
892 | * @sb: super_block | |
893 | * @data: mount options | |
894 | * @silent: silent mode flag | |
783f6184 | 895 | * |
aa7dfb89 | 896 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
897 | * So, the recovery process is protected from other simultaneous mounts. |
898 | */ | |
899 | static int | |
348fe8da | 900 | nilfs_fill_super(struct super_block *sb, void *data, int silent) |
783f6184 | 901 | { |
348fe8da | 902 | struct the_nilfs *nilfs; |
783f6184 | 903 | struct nilfs_sb_info *sbi; |
4d8d9293 | 904 | struct nilfs_root *fsroot; |
026a7d63 | 905 | struct backing_dev_info *bdi; |
783f6184 RK |
906 | __u64 cno; |
907 | int err; | |
908 | ||
909 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
910 | if (!sbi) | |
911 | return -ENOMEM; | |
912 | ||
913 | sb->s_fs_info = sbi; | |
348fe8da | 914 | sbi->s_super = sb; |
783f6184 | 915 | |
348fe8da RK |
916 | nilfs = alloc_nilfs(sb->s_bdev); |
917 | if (!nilfs) { | |
918 | err = -ENOMEM; | |
919 | goto failed_sbi; | |
920 | } | |
783f6184 | 921 | sbi->s_nilfs = nilfs; |
783f6184 RK |
922 | |
923 | err = init_nilfs(nilfs, sbi, (char *)data); | |
924 | if (err) | |
348fe8da | 925 | goto failed_nilfs; |
783f6184 RK |
926 | |
927 | spin_lock_init(&sbi->s_inode_lock); | |
928 | INIT_LIST_HEAD(&sbi->s_dirty_files); | |
783f6184 RK |
929 | |
930 | /* | |
931 | * Following initialization is overlapped because | |
932 | * nilfs_sb_info structure has been cleared at the beginning. | |
933 | * But we reserve them to keep our interest and make ready | |
934 | * for the future change. | |
935 | */ | |
936 | get_random_bytes(&sbi->s_next_generation, | |
937 | sizeof(sbi->s_next_generation)); | |
938 | spin_lock_init(&sbi->s_next_gen_lock); | |
939 | ||
940 | sb->s_op = &nilfs_sops; | |
941 | sb->s_export_op = &nilfs_export_ops; | |
942 | sb->s_root = NULL; | |
61239230 | 943 | sb->s_time_gran = 1; |
026a7d63 RK |
944 | |
945 | bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info; | |
946 | sb->s_bdi = bdi ? : &default_backing_dev_info; | |
783f6184 | 947 | |
f50a4c81 RK |
948 | err = load_nilfs(nilfs, sbi); |
949 | if (err) | |
348fe8da | 950 | goto failed_nilfs; |
f50a4c81 | 951 | |
783f6184 | 952 | cno = nilfs_last_cno(nilfs); |
ab4d8f7e | 953 | err = nilfs_attach_checkpoint(sbi, cno, true, &fsroot); |
783f6184 | 954 | if (err) { |
f11459ad RK |
955 | printk(KERN_ERR "NILFS: error loading last checkpoint " |
956 | "(checkpoint number=%llu).\n", (unsigned long long)cno); | |
f1e89c86 | 957 | goto failed_unload; |
783f6184 RK |
958 | } |
959 | ||
960 | if (!(sb->s_flags & MS_RDONLY)) { | |
e912a5b6 | 961 | err = nilfs_attach_segment_constructor(sbi, fsroot); |
783f6184 RK |
962 | if (err) |
963 | goto failed_checkpoint; | |
964 | } | |
965 | ||
367ea334 RK |
966 | err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root); |
967 | if (err) | |
783f6184 | 968 | goto failed_segctor; |
783f6184 | 969 | |
4d8d9293 | 970 | nilfs_put_root(fsroot); |
783f6184 RK |
971 | |
972 | if (!(sb->s_flags & MS_RDONLY)) { | |
973 | down_write(&nilfs->ns_sem); | |
5beb6e0b | 974 | nilfs_setup_super(sbi, true); |
783f6184 RK |
975 | up_write(&nilfs->ns_sem); |
976 | } | |
977 | ||
783f6184 RK |
978 | return 0; |
979 | ||
783f6184 RK |
980 | failed_segctor: |
981 | nilfs_detach_segment_constructor(sbi); | |
982 | ||
983 | failed_checkpoint: | |
4d8d9293 | 984 | nilfs_put_root(fsroot); |
783f6184 | 985 | |
f1e89c86 RK |
986 | failed_unload: |
987 | iput(nilfs->ns_sufile); | |
988 | iput(nilfs->ns_cpfile); | |
989 | iput(nilfs->ns_dat); | |
990 | ||
348fe8da RK |
991 | failed_nilfs: |
992 | destroy_nilfs(nilfs); | |
783f6184 RK |
993 | |
994 | failed_sbi: | |
783f6184 | 995 | sb->s_fs_info = NULL; |
f11459ad | 996 | kfree(sbi); |
783f6184 RK |
997 | return err; |
998 | } | |
999 | ||
1000 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
1001 | { | |
1002 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
783f6184 RK |
1003 | struct the_nilfs *nilfs = sbi->s_nilfs; |
1004 | unsigned long old_sb_flags; | |
1005 | struct nilfs_mount_options old_opts; | |
f11459ad | 1006 | int err; |
783f6184 RK |
1007 | |
1008 | old_sb_flags = sb->s_flags; | |
1009 | old_opts.mount_opt = sbi->s_mount_opt; | |
783f6184 | 1010 | |
7c017457 | 1011 | if (!parse_options(data, sb, 1)) { |
783f6184 RK |
1012 | err = -EINVAL; |
1013 | goto restore_opts; | |
1014 | } | |
1015 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); | |
1016 | ||
d240e067 | 1017 | err = -EINVAL; |
783f6184 | 1018 | |
0234576d RK |
1019 | if (!nilfs_valid_fs(nilfs)) { |
1020 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1021 | "remount because the filesystem is in an " | |
1022 | "incomplete recovery state.\n", sb->s_id); | |
0234576d RK |
1023 | goto restore_opts; |
1024 | } | |
1025 | ||
783f6184 RK |
1026 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
1027 | goto out; | |
1028 | if (*flags & MS_RDONLY) { | |
1029 | /* Shutting down the segment constructor */ | |
1030 | nilfs_detach_segment_constructor(sbi); | |
1031 | sb->s_flags |= MS_RDONLY; | |
1032 | ||
783f6184 RK |
1033 | /* |
1034 | * Remounting a valid RW partition RDONLY, so set | |
1035 | * the RDONLY flag and then mark the partition as valid again. | |
1036 | */ | |
1037 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 1038 | nilfs_cleanup_super(sbi); |
783f6184 RK |
1039 | up_write(&nilfs->ns_sem); |
1040 | } else { | |
c5ca48aa | 1041 | __u64 features; |
e912a5b6 | 1042 | struct nilfs_root *root; |
c5ca48aa | 1043 | |
783f6184 RK |
1044 | /* |
1045 | * Mounting a RDONLY partition read-write, so reread and | |
1046 | * store the current valid flag. (It may have been changed | |
1047 | * by fsck since we originally mounted the partition.) | |
1048 | */ | |
c5ca48aa RK |
1049 | down_read(&nilfs->ns_sem); |
1050 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & | |
1051 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
1052 | up_read(&nilfs->ns_sem); | |
1053 | if (features) { | |
1054 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1055 | "remount RDWR because of unsupported optional " | |
1056 | "features (%llx)\n", | |
1057 | sb->s_id, (unsigned long long)features); | |
1058 | err = -EROFS; | |
1059 | goto restore_opts; | |
1060 | } | |
1061 | ||
783f6184 | 1062 | sb->s_flags &= ~MS_RDONLY; |
783f6184 | 1063 | |
e912a5b6 RK |
1064 | root = NILFS_I(sb->s_root->d_inode)->i_root; |
1065 | err = nilfs_attach_segment_constructor(sbi, root); | |
783f6184 | 1066 | if (err) |
e59399d0 | 1067 | goto restore_opts; |
783f6184 RK |
1068 | |
1069 | down_write(&nilfs->ns_sem); | |
5beb6e0b | 1070 | nilfs_setup_super(sbi, true); |
783f6184 | 1071 | up_write(&nilfs->ns_sem); |
783f6184 RK |
1072 | } |
1073 | out: | |
1074 | return 0; | |
1075 | ||
783f6184 RK |
1076 | restore_opts: |
1077 | sb->s_flags = old_sb_flags; | |
1078 | sbi->s_mount_opt = old_opts.mount_opt; | |
783f6184 RK |
1079 | return err; |
1080 | } | |
1081 | ||
1082 | struct nilfs_super_data { | |
1083 | struct block_device *bdev; | |
6dd47406 | 1084 | struct nilfs_sb_info *sbi; |
783f6184 RK |
1085 | __u64 cno; |
1086 | int flags; | |
1087 | }; | |
1088 | ||
1089 | /** | |
1090 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
1091 | * @data: mount options | |
1092 | * @sd: nilfs_super_data | |
1093 | */ | |
1094 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
1095 | { | |
1096 | char *p, *options = data; | |
1097 | substring_t args[MAX_OPT_ARGS]; | |
c05dbfc2 | 1098 | int token; |
783f6184 RK |
1099 | int ret = 0; |
1100 | ||
1101 | do { | |
1102 | p = strsep(&options, ","); | |
1103 | if (p != NULL && *p) { | |
1104 | token = match_token(p, tokens, args); | |
1105 | if (token == Opt_snapshot) { | |
c05dbfc2 | 1106 | if (!(sd->flags & MS_RDONLY)) { |
783f6184 | 1107 | ret++; |
c05dbfc2 RK |
1108 | } else { |
1109 | sd->cno = simple_strtoull(args[0].from, | |
1110 | NULL, 0); | |
1111 | /* | |
1112 | * No need to see the end pointer; | |
1113 | * match_token() has done syntax | |
1114 | * checking. | |
1115 | */ | |
1116 | if (sd->cno == 0) | |
1117 | ret++; | |
783f6184 RK |
1118 | } |
1119 | } | |
1120 | if (ret) | |
1121 | printk(KERN_ERR | |
1122 | "NILFS: invalid mount option: %s\n", p); | |
1123 | } | |
1124 | if (!options) | |
1125 | break; | |
1126 | BUG_ON(options == data); | |
1127 | *(options - 1) = ','; | |
1128 | } while (!ret); | |
1129 | return ret; | |
1130 | } | |
1131 | ||
1132 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1133 | { | |
f11459ad | 1134 | s->s_bdev = data; |
783f6184 RK |
1135 | s->s_dev = s->s_bdev->bd_dev; |
1136 | return 0; | |
1137 | } | |
1138 | ||
1139 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 | 1140 | { |
f11459ad | 1141 | return (void *)s->s_bdev == data; |
783f6184 RK |
1142 | } |
1143 | ||
e4c59d61 AV |
1144 | static struct dentry * |
1145 | nilfs_mount(struct file_system_type *fs_type, int flags, | |
1146 | const char *dev_name, void *data) | |
783f6184 RK |
1147 | { |
1148 | struct nilfs_super_data sd; | |
33c8e57c | 1149 | struct super_block *s; |
d4d77629 | 1150 | fmode_t mode = FMODE_READ | FMODE_EXCL; |
f11459ad RK |
1151 | struct dentry *root_dentry; |
1152 | int err, s_new = false; | |
783f6184 | 1153 | |
13e90559 RK |
1154 | if (!(flags & MS_RDONLY)) |
1155 | mode |= FMODE_WRITE; | |
1156 | ||
d4d77629 | 1157 | sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type); |
d6d4c19c | 1158 | if (IS_ERR(sd.bdev)) |
e4c59d61 | 1159 | return ERR_CAST(sd.bdev); |
783f6184 | 1160 | |
783f6184 RK |
1161 | sd.cno = 0; |
1162 | sd.flags = flags; | |
1163 | if (nilfs_identify((char *)data, &sd)) { | |
1164 | err = -EINVAL; | |
1165 | goto failed; | |
1166 | } | |
1167 | ||
6dd47406 | 1168 | /* |
5beb6e0b RK |
1169 | * once the super is inserted into the list by sget, s_umount |
1170 | * will protect the lockfs code from trying to start a snapshot | |
1171 | * while we are mounting | |
6dd47406 | 1172 | */ |
5beb6e0b RK |
1173 | mutex_lock(&sd.bdev->bd_fsfreeze_mutex); |
1174 | if (sd.bdev->bd_fsfreeze_count > 0) { | |
1175 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); | |
1176 | err = -EBUSY; | |
1177 | goto failed; | |
1178 | } | |
f11459ad | 1179 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev); |
5beb6e0b | 1180 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); |
33c8e57c RK |
1181 | if (IS_ERR(s)) { |
1182 | err = PTR_ERR(s); | |
348fe8da | 1183 | goto failed; |
783f6184 RK |
1184 | } |
1185 | ||
1186 | if (!s->s_root) { | |
1187 | char b[BDEVNAME_SIZE]; | |
1188 | ||
f11459ad RK |
1189 | s_new = true; |
1190 | ||
33c8e57c | 1191 | /* New superblock instance created */ |
783f6184 | 1192 | s->s_flags = flags; |
4571b82c | 1193 | s->s_mode = mode; |
783f6184 RK |
1194 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); |
1195 | sb_set_blocksize(s, block_size(sd.bdev)); | |
1196 | ||
348fe8da | 1197 | err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
783f6184 | 1198 | if (err) |
348fe8da | 1199 | goto failed_super; |
783f6184 RK |
1200 | |
1201 | s->s_flags |= MS_ACTIVE; | |
f11459ad RK |
1202 | } else if (!sd.cno) { |
1203 | int busy = false; | |
1204 | ||
1205 | if (nilfs_tree_was_touched(s->s_root)) { | |
1206 | busy = nilfs_try_to_shrink_tree(s->s_root); | |
1207 | if (busy && (flags ^ s->s_flags) & MS_RDONLY) { | |
1208 | printk(KERN_ERR "NILFS: the device already " | |
1209 | "has a %s mount.\n", | |
1210 | (s->s_flags & MS_RDONLY) ? | |
1211 | "read-only" : "read/write"); | |
1212 | err = -EBUSY; | |
1213 | goto failed_super; | |
1214 | } | |
1215 | } | |
1216 | if (!busy) { | |
1217 | /* | |
1218 | * Try remount to setup mount states if the current | |
1219 | * tree is not mounted and only snapshots use this sb. | |
1220 | */ | |
1221 | err = nilfs_remount(s, &flags, data); | |
1222 | if (err) | |
1223 | goto failed_super; | |
1224 | } | |
783f6184 RK |
1225 | } |
1226 | ||
f11459ad RK |
1227 | if (sd.cno) { |
1228 | err = nilfs_attach_snapshot(s, sd.cno, &root_dentry); | |
348fe8da | 1229 | if (err) |
f11459ad | 1230 | goto failed_super; |
f11459ad RK |
1231 | } else { |
1232 | root_dentry = dget(s->s_root); | |
783f6184 RK |
1233 | } |
1234 | ||
f11459ad | 1235 | if (!s_new) |
d4d77629 | 1236 | blkdev_put(sd.bdev, mode); |
783f6184 | 1237 | |
e4c59d61 | 1238 | return root_dentry; |
783f6184 | 1239 | |
f11459ad | 1240 | failed_super: |
a95161aa | 1241 | deactivate_locked_super(s); |
783f6184 | 1242 | |
348fe8da RK |
1243 | failed: |
1244 | if (!s_new) | |
d4d77629 | 1245 | blkdev_put(sd.bdev, mode); |
e4c59d61 | 1246 | return ERR_PTR(err); |
783f6184 RK |
1247 | } |
1248 | ||
783f6184 RK |
1249 | struct file_system_type nilfs_fs_type = { |
1250 | .owner = THIS_MODULE, | |
1251 | .name = "nilfs2", | |
e4c59d61 | 1252 | .mount = nilfs_mount, |
783f6184 RK |
1253 | .kill_sb = kill_block_super, |
1254 | .fs_flags = FS_REQUIRES_DEV, | |
1255 | }; | |
1256 | ||
41c88bd7 | 1257 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1258 | { |
41c88bd7 | 1259 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1260 | |
41c88bd7 LH |
1261 | INIT_LIST_HEAD(&ii->i_dirty); |
1262 | #ifdef CONFIG_NILFS_XATTR | |
1263 | init_rwsem(&ii->xattr_sem); | |
1264 | #endif | |
1265 | nilfs_btnode_cache_init_once(&ii->i_btnode_cache); | |
05d0e94b | 1266 | ii->i_bmap = &ii->i_bmap_data; |
41c88bd7 LH |
1267 | inode_init_once(&ii->vfs_inode); |
1268 | } | |
783f6184 | 1269 | |
41c88bd7 LH |
1270 | static void nilfs_segbuf_init_once(void *obj) |
1271 | { | |
1272 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1273 | } | |
783f6184 | 1274 | |
41c88bd7 LH |
1275 | static void nilfs_destroy_cachep(void) |
1276 | { | |
84cb0999 | 1277 | if (nilfs_inode_cachep) |
41c88bd7 | 1278 | kmem_cache_destroy(nilfs_inode_cachep); |
84cb0999 | 1279 | if (nilfs_transaction_cachep) |
41c88bd7 | 1280 | kmem_cache_destroy(nilfs_transaction_cachep); |
84cb0999 | 1281 | if (nilfs_segbuf_cachep) |
41c88bd7 | 1282 | kmem_cache_destroy(nilfs_segbuf_cachep); |
84cb0999 | 1283 | if (nilfs_btree_path_cache) |
41c88bd7 LH |
1284 | kmem_cache_destroy(nilfs_btree_path_cache); |
1285 | } | |
783f6184 | 1286 | |
41c88bd7 LH |
1287 | static int __init nilfs_init_cachep(void) |
1288 | { | |
1289 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1290 | sizeof(struct nilfs_inode_info), 0, | |
1291 | SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once); | |
1292 | if (!nilfs_inode_cachep) | |
1293 | goto fail; | |
1294 | ||
1295 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1296 | sizeof(struct nilfs_transaction_info), 0, | |
1297 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1298 | if (!nilfs_transaction_cachep) | |
1299 | goto fail; | |
1300 | ||
1301 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1302 | sizeof(struct nilfs_segment_buffer), 0, | |
1303 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1304 | if (!nilfs_segbuf_cachep) | |
1305 | goto fail; | |
1306 | ||
1307 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1308 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1309 | 0, 0, NULL); | |
1310 | if (!nilfs_btree_path_cache) | |
1311 | goto fail; | |
783f6184 RK |
1312 | |
1313 | return 0; | |
1314 | ||
41c88bd7 LH |
1315 | fail: |
1316 | nilfs_destroy_cachep(); | |
1317 | return -ENOMEM; | |
1318 | } | |
1319 | ||
1320 | static int __init init_nilfs_fs(void) | |
1321 | { | |
1322 | int err; | |
783f6184 | 1323 | |
41c88bd7 LH |
1324 | err = nilfs_init_cachep(); |
1325 | if (err) | |
1326 | goto fail; | |
783f6184 | 1327 | |
41c88bd7 LH |
1328 | err = register_filesystem(&nilfs_fs_type); |
1329 | if (err) | |
1330 | goto free_cachep; | |
783f6184 | 1331 | |
9f130263 | 1332 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1333 | return 0; |
783f6184 | 1334 | |
41c88bd7 LH |
1335 | free_cachep: |
1336 | nilfs_destroy_cachep(); | |
1337 | fail: | |
783f6184 RK |
1338 | return err; |
1339 | } | |
1340 | ||
1341 | static void __exit exit_nilfs_fs(void) | |
1342 | { | |
41c88bd7 | 1343 | nilfs_destroy_cachep(); |
783f6184 RK |
1344 | unregister_filesystem(&nilfs_fs_type); |
1345 | } | |
1346 | ||
1347 | module_init(init_nilfs_fs) | |
1348 | module_exit(exit_nilfs_fs) |