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 | ||
41c88bd7 LH |
71 | struct kmem_cache *nilfs_inode_cachep; |
72 | struct kmem_cache *nilfs_transaction_cachep; | |
73 | struct kmem_cache *nilfs_segbuf_cachep; | |
74 | struct kmem_cache *nilfs_btree_path_cache; | |
75 | ||
783f6184 | 76 | static int nilfs_remount(struct super_block *sb, int *flags, char *data); |
783f6184 | 77 | |
c8a11c8a RK |
78 | static void nilfs_set_error(struct nilfs_sb_info *sbi) |
79 | { | |
80 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 | 81 | struct nilfs_super_block **sbp; |
c8a11c8a RK |
82 | |
83 | down_write(&nilfs->ns_sem); | |
84 | if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { | |
85 | nilfs->ns_mount_state |= NILFS_ERROR_FS; | |
b2ac86e1 | 86 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
87 | if (likely(sbp)) { |
88 | sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
b2ac86e1 JS |
89 | if (sbp[1]) |
90 | sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
91 | nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL); | |
d26493b6 | 92 | } |
c8a11c8a RK |
93 | } |
94 | up_write(&nilfs->ns_sem); | |
95 | } | |
96 | ||
783f6184 RK |
97 | /** |
98 | * nilfs_error() - report failure condition on a filesystem | |
99 | * | |
100 | * nilfs_error() sets an ERROR_FS flag on the superblock as well as | |
101 | * reporting an error message. It should be called when NILFS detects | |
102 | * incoherences or defects of meta data on disk. As for sustainable | |
103 | * errors such as a single-shot I/O error, nilfs_warning() or the printk() | |
104 | * function should be used instead. | |
105 | * | |
106 | * The segment constructor must not call this function because it can | |
107 | * kill itself. | |
108 | */ | |
109 | void nilfs_error(struct super_block *sb, const char *function, | |
110 | const char *fmt, ...) | |
111 | { | |
112 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
113 | va_list args; | |
114 | ||
115 | va_start(args, fmt); | |
116 | printk(KERN_CRIT "NILFS error (device %s): %s: ", sb->s_id, function); | |
117 | vprintk(fmt, args); | |
118 | printk("\n"); | |
119 | va_end(args); | |
120 | ||
121 | if (!(sb->s_flags & MS_RDONLY)) { | |
c8a11c8a | 122 | nilfs_set_error(sbi); |
783f6184 RK |
123 | |
124 | if (nilfs_test_opt(sbi, ERRORS_RO)) { | |
125 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
126 | sb->s_flags |= MS_RDONLY; | |
127 | } | |
128 | } | |
129 | ||
130 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) | |
131 | panic("NILFS (device %s): panic forced after error\n", | |
132 | sb->s_id); | |
133 | } | |
134 | ||
135 | void nilfs_warning(struct super_block *sb, const char *function, | |
136 | const char *fmt, ...) | |
137 | { | |
138 | va_list args; | |
139 | ||
140 | va_start(args, fmt); | |
141 | printk(KERN_WARNING "NILFS warning (device %s): %s: ", | |
142 | sb->s_id, function); | |
143 | vprintk(fmt, args); | |
144 | printk("\n"); | |
145 | va_end(args); | |
146 | } | |
147 | ||
783f6184 | 148 | |
a53b4751 | 149 | struct inode *nilfs_alloc_inode_common(struct the_nilfs *nilfs) |
783f6184 RK |
150 | { |
151 | struct nilfs_inode_info *ii; | |
152 | ||
153 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); | |
154 | if (!ii) | |
155 | return NULL; | |
156 | ii->i_bh = NULL; | |
157 | ii->i_state = 0; | |
0e14a359 | 158 | ii->i_cno = 0; |
783f6184 | 159 | ii->vfs_inode.i_version = 1; |
a53b4751 | 160 | nilfs_btnode_cache_init(&ii->i_btnode_cache, nilfs->ns_bdi); |
783f6184 RK |
161 | return &ii->vfs_inode; |
162 | } | |
163 | ||
a53b4751 RK |
164 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
165 | { | |
166 | return nilfs_alloc_inode_common(NILFS_SB(sb)->s_nilfs); | |
167 | } | |
168 | ||
783f6184 RK |
169 | void nilfs_destroy_inode(struct inode *inode) |
170 | { | |
b91c9a97 RK |
171 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
172 | ||
173 | if (mdi) { | |
174 | kfree(mdi->mi_bgl); /* kfree(NULL) is safe */ | |
175 | kfree(mdi); | |
176 | } | |
783f6184 RK |
177 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
178 | } | |
179 | ||
b2ac86e1 | 180 | static int nilfs_sync_super(struct nilfs_sb_info *sbi, int flag) |
783f6184 RK |
181 | { |
182 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
183 | int err; | |
783f6184 | 184 | |
783f6184 | 185 | retry: |
e339ad31 | 186 | set_buffer_dirty(nilfs->ns_sbh[0]); |
87e99511 CH |
187 | |
188 | if (nilfs_test_opt(sbi, BARRIER)) { | |
189 | err = __sync_dirty_buffer(nilfs->ns_sbh[0], | |
190 | WRITE_SYNC | WRITE_BARRIER); | |
191 | if (err == -EOPNOTSUPP) { | |
192 | nilfs_warning(sbi->s_super, __func__, | |
193 | "barrier-based sync failed. " | |
194 | "disabling barriers\n"); | |
195 | nilfs_clear_opt(sbi, BARRIER); | |
196 | goto retry; | |
197 | } | |
198 | } else { | |
199 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); | |
783f6184 | 200 | } |
87e99511 | 201 | |
e339ad31 | 202 | if (unlikely(err)) { |
783f6184 RK |
203 | printk(KERN_ERR |
204 | "NILFS: unable to write superblock (err=%d)\n", err); | |
e339ad31 | 205 | if (err == -EIO && nilfs->ns_sbh[1]) { |
b2ac86e1 JS |
206 | /* |
207 | * sbp[0] points to newer log than sbp[1], | |
208 | * so copy sbp[0] to sbp[1] to take over sbp[0]. | |
209 | */ | |
210 | memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0], | |
211 | nilfs->ns_sbsize); | |
e339ad31 RK |
212 | nilfs_fall_back_super_block(nilfs); |
213 | goto retry; | |
214 | } | |
215 | } else { | |
216 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; | |
217 | ||
b2ac86e1 JS |
218 | nilfs->ns_sbwcount++; |
219 | ||
e339ad31 RK |
220 | /* |
221 | * The latest segment becomes trailable from the position | |
222 | * written in superblock. | |
223 | */ | |
783f6184 | 224 | clear_nilfs_discontinued(nilfs); |
e339ad31 RK |
225 | |
226 | /* update GC protection for recent segments */ | |
227 | if (nilfs->ns_sbh[1]) { | |
b2ac86e1 | 228 | if (flag == NILFS_SB_COMMIT_ALL) { |
e339ad31 | 229 | set_buffer_dirty(nilfs->ns_sbh[1]); |
b2ac86e1 JS |
230 | if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0) |
231 | goto out; | |
e339ad31 | 232 | } |
b2ac86e1 JS |
233 | if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) < |
234 | le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno)) | |
235 | sbp = nilfs->ns_sbp[1]; | |
e339ad31 | 236 | } |
783f6184 | 237 | |
b2ac86e1 JS |
238 | spin_lock(&nilfs->ns_last_segment_lock); |
239 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); | |
240 | spin_unlock(&nilfs->ns_last_segment_lock); | |
241 | } | |
242 | out: | |
783f6184 RK |
243 | return err; |
244 | } | |
245 | ||
60f46b7e RK |
246 | void nilfs_set_log_cursor(struct nilfs_super_block *sbp, |
247 | struct the_nilfs *nilfs) | |
248 | { | |
249 | sector_t nfreeblocks; | |
250 | ||
251 | /* nilfs->ns_sem must be locked by the caller. */ | |
252 | nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
253 | sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
254 | ||
255 | spin_lock(&nilfs->ns_last_segment_lock); | |
256 | sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
257 | sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
258 | sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
259 | spin_unlock(&nilfs->ns_last_segment_lock); | |
260 | } | |
261 | ||
b2ac86e1 JS |
262 | struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *sbi, |
263 | int flip) | |
783f6184 RK |
264 | { |
265 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
e339ad31 | 266 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 267 | |
d26493b6 | 268 | /* nilfs->ns_sem must be locked by the caller. */ |
34cb9b5c | 269 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
d26493b6 JS |
270 | if (sbp[1] && |
271 | sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
b2ac86e1 | 272 | memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); |
d26493b6 | 273 | } else { |
e339ad31 RK |
274 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", |
275 | sbi->s_super->s_id); | |
d26493b6 | 276 | return NULL; |
e339ad31 | 277 | } |
b2ac86e1 JS |
278 | } else if (sbp[1] && |
279 | sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
280 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
e339ad31 | 281 | } |
b2ac86e1 JS |
282 | |
283 | if (flip && sbp[1]) | |
284 | nilfs_swap_super_block(nilfs); | |
285 | ||
d26493b6 JS |
286 | return sbp; |
287 | } | |
288 | ||
b2ac86e1 | 289 | int nilfs_commit_super(struct nilfs_sb_info *sbi, int flag) |
d26493b6 JS |
290 | { |
291 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
292 | struct nilfs_super_block **sbp = nilfs->ns_sbp; | |
293 | time_t t; | |
294 | ||
295 | /* nilfs->ns_sem must be locked by the caller. */ | |
e339ad31 | 296 | t = get_seconds(); |
b2ac86e1 | 297 | nilfs->ns_sbwtime = t; |
e339ad31 RK |
298 | sbp[0]->s_wtime = cpu_to_le64(t); |
299 | sbp[0]->s_sum = 0; | |
300 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
301 | (unsigned char *)sbp[0], | |
302 | nilfs->ns_sbsize)); | |
b2ac86e1 JS |
303 | if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) { |
304 | sbp[1]->s_wtime = sbp[0]->s_wtime; | |
305 | sbp[1]->s_sum = 0; | |
306 | sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
307 | (unsigned char *)sbp[1], | |
308 | nilfs->ns_sbsize)); | |
e339ad31 | 309 | } |
e605f0a7 | 310 | clear_nilfs_sb_dirty(nilfs); |
b2ac86e1 | 311 | return nilfs_sync_super(sbi, flag); |
783f6184 RK |
312 | } |
313 | ||
7ecaa46c RK |
314 | /** |
315 | * nilfs_cleanup_super() - write filesystem state for cleanup | |
316 | * @sbi: nilfs_sb_info to be unmounted or degraded to read-only | |
317 | * | |
318 | * This function restores state flags in the on-disk super block. | |
319 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the | |
320 | * filesystem was not clean previously. | |
321 | */ | |
322 | int nilfs_cleanup_super(struct nilfs_sb_info *sbi) | |
323 | { | |
d26493b6 | 324 | struct nilfs_super_block **sbp; |
b2ac86e1 | 325 | int flag = NILFS_SB_COMMIT; |
d26493b6 | 326 | int ret = -EIO; |
7ecaa46c | 327 | |
b2ac86e1 | 328 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
329 | if (sbp) { |
330 | sbp[0]->s_state = cpu_to_le16(sbi->s_nilfs->ns_mount_state); | |
b2ac86e1 JS |
331 | nilfs_set_log_cursor(sbp[0], sbi->s_nilfs); |
332 | if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { | |
333 | /* | |
334 | * make the "clean" flag also to the opposite | |
335 | * super block if both super blocks point to | |
336 | * the same checkpoint. | |
337 | */ | |
338 | sbp[1]->s_state = sbp[0]->s_state; | |
339 | flag = NILFS_SB_COMMIT_ALL; | |
340 | } | |
341 | ret = nilfs_commit_super(sbi, flag); | |
d26493b6 | 342 | } |
7ecaa46c RK |
343 | return ret; |
344 | } | |
345 | ||
783f6184 RK |
346 | static void nilfs_put_super(struct super_block *sb) |
347 | { | |
348 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
349 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
350 | ||
351 | nilfs_detach_segment_constructor(sbi); | |
352 | ||
353 | if (!(sb->s_flags & MS_RDONLY)) { | |
354 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 355 | nilfs_cleanup_super(sbi); |
783f6184 RK |
356 | up_write(&nilfs->ns_sem); |
357 | } | |
358 | ||
f1e89c86 RK |
359 | iput(nilfs->ns_sufile); |
360 | iput(nilfs->ns_cpfile); | |
361 | iput(nilfs->ns_dat); | |
362 | ||
348fe8da | 363 | destroy_nilfs(nilfs); |
783f6184 RK |
364 | sbi->s_super = NULL; |
365 | sb->s_fs_info = NULL; | |
f11459ad | 366 | kfree(sbi); |
783f6184 RK |
367 | } |
368 | ||
783f6184 RK |
369 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
370 | { | |
6233caa9 JS |
371 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
372 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 | 373 | struct nilfs_super_block **sbp; |
783f6184 RK |
374 | int err = 0; |
375 | ||
376 | /* This function is called when super block should be written back */ | |
377 | if (wait) | |
378 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
379 | |
380 | down_write(&nilfs->ns_sem); | |
d26493b6 | 381 | if (nilfs_sb_dirty(nilfs)) { |
b2ac86e1 JS |
382 | sbp = nilfs_prepare_super(sbi, nilfs_sb_will_flip(nilfs)); |
383 | if (likely(sbp)) { | |
384 | nilfs_set_log_cursor(sbp[0], nilfs); | |
385 | nilfs_commit_super(sbi, NILFS_SB_COMMIT); | |
386 | } | |
d26493b6 | 387 | } |
6233caa9 JS |
388 | up_write(&nilfs->ns_sem); |
389 | ||
783f6184 RK |
390 | return err; |
391 | } | |
392 | ||
4d8d9293 RK |
393 | int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno, int curr_mnt, |
394 | struct nilfs_root **rootp) | |
783f6184 RK |
395 | { |
396 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
4d8d9293 | 397 | struct nilfs_root *root; |
783f6184 RK |
398 | struct nilfs_checkpoint *raw_cp; |
399 | struct buffer_head *bh_cp; | |
4d8d9293 RK |
400 | int err = -ENOMEM; |
401 | ||
402 | root = nilfs_find_or_create_root( | |
403 | nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); | |
404 | if (!root) | |
405 | return err; | |
783f6184 | 406 | |
e912a5b6 RK |
407 | if (root->ifile) |
408 | goto reuse; /* already attached checkpoint */ | |
783f6184 | 409 | |
1154ecbd | 410 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
411 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
412 | &bh_cp); | |
1154ecbd | 413 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
414 | if (unlikely(err)) { |
415 | if (err == -ENOENT || err == -EINVAL) { | |
416 | printk(KERN_ERR | |
417 | "NILFS: Invalid checkpoint " | |
418 | "(checkpoint number=%llu)\n", | |
419 | (unsigned long long)cno); | |
420 | err = -EINVAL; | |
421 | } | |
422 | goto failed; | |
423 | } | |
f1e89c86 RK |
424 | |
425 | err = nilfs_ifile_read(sbi->s_super, root, nilfs->ns_inode_size, | |
426 | &raw_cp->cp_ifile_inode, &root->ifile); | |
427 | if (err) | |
783f6184 | 428 | goto failed_bh; |
b7c06342 RK |
429 | |
430 | atomic_set(&root->inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); | |
431 | atomic_set(&root->blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); | |
783f6184 RK |
432 | |
433 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
4d8d9293 | 434 | |
e912a5b6 | 435 | reuse: |
4d8d9293 | 436 | *rootp = root; |
783f6184 RK |
437 | return 0; |
438 | ||
439 | failed_bh: | |
440 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
441 | failed: | |
4d8d9293 | 442 | nilfs_put_root(root); |
783f6184 RK |
443 | |
444 | return err; | |
445 | } | |
446 | ||
783f6184 RK |
447 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
448 | { | |
449 | struct super_block *sb = dentry->d_sb; | |
b7c06342 RK |
450 | struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root; |
451 | struct the_nilfs *nilfs = root->nilfs; | |
c306af23 | 452 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
783f6184 RK |
453 | unsigned long long blocks; |
454 | unsigned long overhead; | |
455 | unsigned long nrsvblocks; | |
456 | sector_t nfreeblocks; | |
783f6184 RK |
457 | int err; |
458 | ||
459 | /* | |
460 | * Compute all of the segment blocks | |
461 | * | |
462 | * The blocks before first segment and after last segment | |
463 | * are excluded. | |
464 | */ | |
465 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
466 | - nilfs->ns_first_data_block; | |
467 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
468 | ||
469 | /* | |
470 | * Compute the overhead | |
471 | * | |
7a65004b | 472 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
473 | * We must count them as the overhead. |
474 | */ | |
475 | overhead = 0; | |
476 | ||
477 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
478 | if (unlikely(err)) | |
479 | return err; | |
480 | ||
481 | buf->f_type = NILFS_SUPER_MAGIC; | |
482 | buf->f_bsize = sb->s_blocksize; | |
483 | buf->f_blocks = blocks - overhead; | |
484 | buf->f_bfree = nfreeblocks; | |
485 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
486 | (buf->f_bfree - nrsvblocks) : 0; | |
b7c06342 | 487 | buf->f_files = atomic_read(&root->inodes_count); |
783f6184 RK |
488 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ |
489 | buf->f_namelen = NILFS_NAME_LEN; | |
c306af23 RK |
490 | buf->f_fsid.val[0] = (u32)id; |
491 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
492 | ||
783f6184 RK |
493 | return 0; |
494 | } | |
495 | ||
b58a285b JS |
496 | static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
497 | { | |
498 | struct super_block *sb = vfs->mnt_sb; | |
499 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
f11459ad | 500 | struct nilfs_root *root = NILFS_I(vfs->mnt_root->d_inode)->i_root; |
b58a285b JS |
501 | |
502 | if (!nilfs_test_opt(sbi, BARRIER)) | |
c6b4d57d | 503 | seq_puts(seq, ",nobarrier"); |
f11459ad RK |
504 | if (root->cno != NILFS_CPTREE_CURRENT_CNO) |
505 | seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno); | |
b58a285b | 506 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) |
c6b4d57d | 507 | seq_puts(seq, ",errors=panic"); |
277a6a34 | 508 | if (nilfs_test_opt(sbi, ERRORS_CONT)) |
c6b4d57d | 509 | seq_puts(seq, ",errors=continue"); |
b58a285b | 510 | if (nilfs_test_opt(sbi, STRICT_ORDER)) |
c6b4d57d | 511 | seq_puts(seq, ",order=strict"); |
0234576d | 512 | if (nilfs_test_opt(sbi, NORECOVERY)) |
c6b4d57d | 513 | seq_puts(seq, ",norecovery"); |
e902ec99 | 514 | if (nilfs_test_opt(sbi, DISCARD)) |
c6b4d57d | 515 | seq_puts(seq, ",discard"); |
b58a285b JS |
516 | |
517 | return 0; | |
518 | } | |
519 | ||
b87221de | 520 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
521 | .alloc_inode = nilfs_alloc_inode, |
522 | .destroy_inode = nilfs_destroy_inode, | |
523 | .dirty_inode = nilfs_dirty_inode, | |
524 | /* .write_inode = nilfs_write_inode, */ | |
525 | /* .put_inode = nilfs_put_inode, */ | |
526 | /* .drop_inode = nilfs_drop_inode, */ | |
6fd1e5c9 | 527 | .evict_inode = nilfs_evict_inode, |
783f6184 | 528 | .put_super = nilfs_put_super, |
1dfa2710 | 529 | /* .write_super = nilfs_write_super, */ |
783f6184 RK |
530 | .sync_fs = nilfs_sync_fs, |
531 | /* .write_super_lockfs */ | |
532 | /* .unlockfs */ | |
533 | .statfs = nilfs_statfs, | |
534 | .remount_fs = nilfs_remount, | |
783f6184 | 535 | /* .umount_begin */ |
b58a285b | 536 | .show_options = nilfs_show_options |
783f6184 RK |
537 | }; |
538 | ||
783f6184 RK |
539 | enum { |
540 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
773bc4f3 | 541 | Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
802d3177 | 542 | Opt_discard, Opt_nodiscard, Opt_err, |
783f6184 RK |
543 | }; |
544 | ||
545 | static match_table_t tokens = { | |
546 | {Opt_err_cont, "errors=continue"}, | |
547 | {Opt_err_panic, "errors=panic"}, | |
548 | {Opt_err_ro, "errors=remount-ro"}, | |
773bc4f3 | 549 | {Opt_barrier, "barrier"}, |
91f1953b | 550 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
551 | {Opt_snapshot, "cp=%u"}, |
552 | {Opt_order, "order=%s"}, | |
0234576d | 553 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 554 | {Opt_discard, "discard"}, |
802d3177 | 555 | {Opt_nodiscard, "nodiscard"}, |
783f6184 RK |
556 | {Opt_err, NULL} |
557 | }; | |
558 | ||
7c017457 | 559 | static int parse_options(char *options, struct super_block *sb, int is_remount) |
783f6184 RK |
560 | { |
561 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
562 | char *p; | |
563 | substring_t args[MAX_OPT_ARGS]; | |
564 | int option; | |
565 | ||
566 | if (!options) | |
567 | return 1; | |
568 | ||
569 | while ((p = strsep(&options, ",")) != NULL) { | |
570 | int token; | |
571 | if (!*p) | |
572 | continue; | |
573 | ||
574 | token = match_token(p, tokens, args); | |
575 | switch (token) { | |
773bc4f3 RK |
576 | case Opt_barrier: |
577 | nilfs_set_opt(sbi, BARRIER); | |
578 | break; | |
91f1953b JS |
579 | case Opt_nobarrier: |
580 | nilfs_clear_opt(sbi, BARRIER); | |
783f6184 RK |
581 | break; |
582 | case Opt_order: | |
583 | if (strcmp(args[0].from, "relaxed") == 0) | |
584 | /* Ordered data semantics */ | |
585 | nilfs_clear_opt(sbi, STRICT_ORDER); | |
586 | else if (strcmp(args[0].from, "strict") == 0) | |
587 | /* Strict in-order semantics */ | |
588 | nilfs_set_opt(sbi, STRICT_ORDER); | |
589 | else | |
590 | return 0; | |
591 | break; | |
592 | case Opt_err_panic: | |
593 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC); | |
594 | break; | |
595 | case Opt_err_ro: | |
596 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO); | |
597 | break; | |
598 | case Opt_err_cont: | |
599 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT); | |
600 | break; | |
601 | case Opt_snapshot: | |
602 | if (match_int(&args[0], &option) || option <= 0) | |
603 | return 0; | |
7c017457 | 604 | if (is_remount) { |
f11459ad RK |
605 | printk(KERN_ERR |
606 | "NILFS: \"%s\" option is invalid " | |
607 | "for remount.\n", p); | |
783f6184 | 608 | return 0; |
7c017457 | 609 | } |
783f6184 | 610 | break; |
0234576d RK |
611 | case Opt_norecovery: |
612 | nilfs_set_opt(sbi, NORECOVERY); | |
613 | break; | |
e902ec99 JS |
614 | case Opt_discard: |
615 | nilfs_set_opt(sbi, DISCARD); | |
616 | break; | |
802d3177 RK |
617 | case Opt_nodiscard: |
618 | nilfs_clear_opt(sbi, DISCARD); | |
619 | break; | |
783f6184 RK |
620 | default: |
621 | printk(KERN_ERR | |
622 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
623 | return 0; | |
624 | } | |
625 | } | |
626 | return 1; | |
627 | } | |
628 | ||
629 | static inline void | |
630 | nilfs_set_default_options(struct nilfs_sb_info *sbi, | |
631 | struct nilfs_super_block *sbp) | |
632 | { | |
633 | sbi->s_mount_opt = | |
277a6a34 | 634 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
635 | } |
636 | ||
637 | static int nilfs_setup_super(struct nilfs_sb_info *sbi) | |
638 | { | |
639 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 JS |
640 | struct nilfs_super_block **sbp; |
641 | int max_mnt_count; | |
642 | int mnt_count; | |
643 | ||
644 | /* nilfs->ns_sem must be locked by the caller. */ | |
b2ac86e1 | 645 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
646 | if (!sbp) |
647 | return -EIO; | |
648 | ||
649 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); | |
650 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); | |
783f6184 | 651 | |
f50a4c81 | 652 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
783f6184 RK |
653 | printk(KERN_WARNING |
654 | "NILFS warning: mounting fs with errors\n"); | |
655 | #if 0 | |
656 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
657 | printk(KERN_WARNING | |
658 | "NILFS warning: maximal mount count reached\n"); | |
659 | #endif | |
660 | } | |
661 | if (!max_mnt_count) | |
d26493b6 | 662 | sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
783f6184 | 663 | |
d26493b6 JS |
664 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
665 | sbp[0]->s_state = | |
666 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); | |
667 | sbp[0]->s_mtime = cpu_to_le64(get_seconds()); | |
b2ac86e1 JS |
668 | /* synchronize sbp[1] with sbp[0] */ |
669 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
670 | return nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL); | |
783f6184 RK |
671 | } |
672 | ||
e339ad31 RK |
673 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
674 | u64 pos, int blocksize, | |
675 | struct buffer_head **pbh) | |
783f6184 | 676 | { |
e339ad31 RK |
677 | unsigned long long sb_index = pos; |
678 | unsigned long offset; | |
783f6184 | 679 | |
e339ad31 | 680 | offset = do_div(sb_index, blocksize); |
783f6184 | 681 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 682 | if (!*pbh) |
783f6184 | 683 | return NULL; |
783f6184 RK |
684 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
685 | } | |
686 | ||
783f6184 RK |
687 | int nilfs_store_magic_and_option(struct super_block *sb, |
688 | struct nilfs_super_block *sbp, | |
689 | char *data) | |
690 | { | |
691 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
692 | ||
783f6184 RK |
693 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
694 | ||
695 | /* FS independent flags */ | |
696 | #ifdef NILFS_ATIME_DISABLE | |
697 | sb->s_flags |= MS_NOATIME; | |
698 | #endif | |
699 | ||
783f6184 RK |
700 | nilfs_set_default_options(sbi, sbp); |
701 | ||
702 | sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid); | |
703 | sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid); | |
704 | sbi->s_interval = le32_to_cpu(sbp->s_c_interval); | |
705 | sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max); | |
706 | ||
7c017457 | 707 | return !parse_options(data, sb, 0) ? -EINVAL : 0 ; |
783f6184 RK |
708 | } |
709 | ||
c5ca48aa RK |
710 | int nilfs_check_feature_compatibility(struct super_block *sb, |
711 | struct nilfs_super_block *sbp) | |
712 | { | |
713 | __u64 features; | |
714 | ||
715 | features = le64_to_cpu(sbp->s_feature_incompat) & | |
716 | ~NILFS_FEATURE_INCOMPAT_SUPP; | |
717 | if (features) { | |
718 | printk(KERN_ERR "NILFS: couldn't mount because of unsupported " | |
719 | "optional features (%llx)\n", | |
720 | (unsigned long long)features); | |
721 | return -EINVAL; | |
722 | } | |
723 | features = le64_to_cpu(sbp->s_feature_compat_ro) & | |
724 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
725 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
726 | printk(KERN_ERR "NILFS: couldn't mount RDWR because of " | |
727 | "unsupported optional features (%llx)\n", | |
728 | (unsigned long long)features); | |
729 | return -EINVAL; | |
730 | } | |
731 | return 0; | |
732 | } | |
733 | ||
367ea334 RK |
734 | static int nilfs_get_root_dentry(struct super_block *sb, |
735 | struct nilfs_root *root, | |
736 | struct dentry **root_dentry) | |
737 | { | |
738 | struct inode *inode; | |
739 | struct dentry *dentry; | |
740 | int ret = 0; | |
741 | ||
742 | inode = nilfs_iget(sb, root, NILFS_ROOT_INO); | |
743 | if (IS_ERR(inode)) { | |
744 | printk(KERN_ERR "NILFS: get root inode failed\n"); | |
745 | ret = PTR_ERR(inode); | |
746 | goto out; | |
747 | } | |
748 | if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { | |
749 | iput(inode); | |
750 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); | |
751 | ret = -EINVAL; | |
752 | goto out; | |
753 | } | |
754 | ||
f11459ad RK |
755 | if (root->cno == NILFS_CPTREE_CURRENT_CNO) { |
756 | dentry = d_find_alias(inode); | |
757 | if (!dentry) { | |
758 | dentry = d_alloc_root(inode); | |
759 | if (!dentry) { | |
760 | iput(inode); | |
761 | ret = -ENOMEM; | |
762 | goto failed_dentry; | |
763 | } | |
764 | } else { | |
765 | iput(inode); | |
766 | } | |
767 | } else { | |
768 | dentry = d_obtain_alias(inode); | |
769 | if (IS_ERR(dentry)) { | |
770 | ret = PTR_ERR(dentry); | |
771 | goto failed_dentry; | |
772 | } | |
367ea334 RK |
773 | } |
774 | *root_dentry = dentry; | |
775 | out: | |
776 | return ret; | |
f11459ad RK |
777 | |
778 | failed_dentry: | |
779 | printk(KERN_ERR "NILFS: get root dentry failed\n"); | |
780 | goto out; | |
367ea334 RK |
781 | } |
782 | ||
ab4d8f7e RK |
783 | static int nilfs_attach_snapshot(struct super_block *s, __u64 cno, |
784 | struct dentry **root_dentry) | |
785 | { | |
786 | struct the_nilfs *nilfs = NILFS_SB(s)->s_nilfs; | |
787 | struct nilfs_root *root; | |
788 | int ret; | |
789 | ||
790 | down_read(&nilfs->ns_segctor_sem); | |
791 | ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno); | |
792 | up_read(&nilfs->ns_segctor_sem); | |
793 | if (ret < 0) { | |
794 | ret = (ret == -ENOENT) ? -EINVAL : ret; | |
795 | goto out; | |
796 | } else if (!ret) { | |
797 | printk(KERN_ERR "NILFS: The specified checkpoint is " | |
798 | "not a snapshot (checkpoint number=%llu).\n", | |
799 | (unsigned long long)cno); | |
800 | ret = -EINVAL; | |
801 | goto out; | |
802 | } | |
803 | ||
804 | ret = nilfs_attach_checkpoint(NILFS_SB(s), cno, false, &root); | |
805 | if (ret) { | |
806 | printk(KERN_ERR "NILFS: error loading snapshot " | |
807 | "(checkpoint number=%llu).\n", | |
808 | (unsigned long long)cno); | |
809 | goto out; | |
810 | } | |
811 | ret = nilfs_get_root_dentry(s, root, root_dentry); | |
812 | nilfs_put_root(root); | |
813 | out: | |
814 | return ret; | |
815 | } | |
816 | ||
f11459ad RK |
817 | static int nilfs_tree_was_touched(struct dentry *root_dentry) |
818 | { | |
819 | return atomic_read(&root_dentry->d_count) > 1; | |
820 | } | |
821 | ||
822 | /** | |
823 | * nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint | |
824 | * @root_dentry: root dentry of the tree to be shrunk | |
825 | * | |
826 | * This function returns true if the tree was in-use. | |
827 | */ | |
828 | static int nilfs_try_to_shrink_tree(struct dentry *root_dentry) | |
829 | { | |
830 | if (have_submounts(root_dentry)) | |
831 | return true; | |
832 | shrink_dcache_parent(root_dentry); | |
833 | return nilfs_tree_was_touched(root_dentry); | |
834 | } | |
835 | ||
032dbb3b RK |
836 | int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno) |
837 | { | |
838 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; | |
839 | struct nilfs_root *root; | |
840 | struct inode *inode; | |
841 | struct dentry *dentry; | |
842 | int ret; | |
843 | ||
844 | if (cno < 0 || cno > nilfs->ns_cno) | |
845 | return false; | |
846 | ||
847 | if (cno >= nilfs_last_cno(nilfs)) | |
848 | return true; /* protect recent checkpoints */ | |
849 | ||
850 | ret = false; | |
851 | root = nilfs_lookup_root(NILFS_SB(sb)->s_nilfs, cno); | |
852 | if (root) { | |
853 | inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO); | |
854 | if (inode) { | |
855 | dentry = d_find_alias(inode); | |
856 | if (dentry) { | |
857 | if (nilfs_tree_was_touched(dentry)) | |
858 | ret = nilfs_try_to_shrink_tree(dentry); | |
859 | dput(dentry); | |
860 | } | |
861 | iput(inode); | |
862 | } | |
863 | nilfs_put_root(root); | |
864 | } | |
865 | return ret; | |
866 | } | |
867 | ||
783f6184 RK |
868 | /** |
869 | * nilfs_fill_super() - initialize a super block instance | |
870 | * @sb: super_block | |
871 | * @data: mount options | |
872 | * @silent: silent mode flag | |
783f6184 | 873 | * |
aa7dfb89 | 874 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
875 | * So, the recovery process is protected from other simultaneous mounts. |
876 | */ | |
877 | static int | |
348fe8da | 878 | nilfs_fill_super(struct super_block *sb, void *data, int silent) |
783f6184 | 879 | { |
348fe8da | 880 | struct the_nilfs *nilfs; |
783f6184 | 881 | struct nilfs_sb_info *sbi; |
4d8d9293 | 882 | struct nilfs_root *fsroot; |
783f6184 | 883 | __u64 cno; |
ab4d8f7e | 884 | int err; |
783f6184 RK |
885 | |
886 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
887 | if (!sbi) | |
888 | return -ENOMEM; | |
889 | ||
890 | sb->s_fs_info = sbi; | |
348fe8da | 891 | sbi->s_super = sb; |
783f6184 | 892 | |
348fe8da RK |
893 | nilfs = alloc_nilfs(sb->s_bdev); |
894 | if (!nilfs) { | |
895 | err = -ENOMEM; | |
896 | goto failed_sbi; | |
897 | } | |
783f6184 | 898 | sbi->s_nilfs = nilfs; |
783f6184 RK |
899 | |
900 | err = init_nilfs(nilfs, sbi, (char *)data); | |
901 | if (err) | |
348fe8da | 902 | goto failed_nilfs; |
783f6184 RK |
903 | |
904 | spin_lock_init(&sbi->s_inode_lock); | |
905 | INIT_LIST_HEAD(&sbi->s_dirty_files); | |
783f6184 RK |
906 | |
907 | /* | |
908 | * Following initialization is overlapped because | |
909 | * nilfs_sb_info structure has been cleared at the beginning. | |
910 | * But we reserve them to keep our interest and make ready | |
911 | * for the future change. | |
912 | */ | |
913 | get_random_bytes(&sbi->s_next_generation, | |
914 | sizeof(sbi->s_next_generation)); | |
915 | spin_lock_init(&sbi->s_next_gen_lock); | |
916 | ||
917 | sb->s_op = &nilfs_sops; | |
918 | sb->s_export_op = &nilfs_export_ops; | |
919 | sb->s_root = NULL; | |
61239230 | 920 | sb->s_time_gran = 1; |
973bec34 | 921 | sb->s_bdi = nilfs->ns_bdi; |
783f6184 | 922 | |
f50a4c81 RK |
923 | err = load_nilfs(nilfs, sbi); |
924 | if (err) | |
348fe8da | 925 | goto failed_nilfs; |
f50a4c81 | 926 | |
ab4d8f7e RK |
927 | cno = nilfs_last_cno(nilfs); |
928 | err = nilfs_attach_checkpoint(sbi, cno, true, &fsroot); | |
783f6184 | 929 | if (err) { |
f11459ad RK |
930 | printk(KERN_ERR "NILFS: error loading last checkpoint " |
931 | "(checkpoint number=%llu).\n", (unsigned long long)cno); | |
f1e89c86 | 932 | goto failed_unload; |
783f6184 RK |
933 | } |
934 | ||
935 | if (!(sb->s_flags & MS_RDONLY)) { | |
e912a5b6 | 936 | err = nilfs_attach_segment_constructor(sbi, fsroot); |
783f6184 RK |
937 | if (err) |
938 | goto failed_checkpoint; | |
939 | } | |
940 | ||
367ea334 RK |
941 | err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root); |
942 | if (err) | |
783f6184 | 943 | goto failed_segctor; |
783f6184 | 944 | |
4d8d9293 RK |
945 | nilfs_put_root(fsroot); |
946 | ||
783f6184 RK |
947 | if (!(sb->s_flags & MS_RDONLY)) { |
948 | down_write(&nilfs->ns_sem); | |
949 | nilfs_setup_super(sbi); | |
950 | up_write(&nilfs->ns_sem); | |
951 | } | |
952 | ||
783f6184 RK |
953 | return 0; |
954 | ||
783f6184 RK |
955 | failed_segctor: |
956 | nilfs_detach_segment_constructor(sbi); | |
957 | ||
958 | failed_checkpoint: | |
4d8d9293 | 959 | nilfs_put_root(fsroot); |
783f6184 | 960 | |
f1e89c86 RK |
961 | failed_unload: |
962 | iput(nilfs->ns_sufile); | |
963 | iput(nilfs->ns_cpfile); | |
964 | iput(nilfs->ns_dat); | |
965 | ||
348fe8da RK |
966 | failed_nilfs: |
967 | destroy_nilfs(nilfs); | |
968 | ||
783f6184 | 969 | failed_sbi: |
783f6184 | 970 | sb->s_fs_info = NULL; |
f11459ad | 971 | kfree(sbi); |
783f6184 RK |
972 | return err; |
973 | } | |
974 | ||
975 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
976 | { | |
977 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
783f6184 RK |
978 | struct the_nilfs *nilfs = sbi->s_nilfs; |
979 | unsigned long old_sb_flags; | |
980 | struct nilfs_mount_options old_opts; | |
f11459ad | 981 | int err; |
783f6184 RK |
982 | |
983 | old_sb_flags = sb->s_flags; | |
984 | old_opts.mount_opt = sbi->s_mount_opt; | |
783f6184 | 985 | |
7c017457 | 986 | if (!parse_options(data, sb, 1)) { |
783f6184 RK |
987 | err = -EINVAL; |
988 | goto restore_opts; | |
989 | } | |
990 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); | |
991 | ||
d240e067 | 992 | err = -EINVAL; |
783f6184 | 993 | |
0234576d RK |
994 | if (!nilfs_valid_fs(nilfs)) { |
995 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
996 | "remount because the filesystem is in an " | |
997 | "incomplete recovery state.\n", sb->s_id); | |
0234576d RK |
998 | goto restore_opts; |
999 | } | |
1000 | ||
783f6184 RK |
1001 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
1002 | goto out; | |
1003 | if (*flags & MS_RDONLY) { | |
1004 | /* Shutting down the segment constructor */ | |
1005 | nilfs_detach_segment_constructor(sbi); | |
1006 | sb->s_flags |= MS_RDONLY; | |
1007 | ||
783f6184 RK |
1008 | /* |
1009 | * Remounting a valid RW partition RDONLY, so set | |
1010 | * the RDONLY flag and then mark the partition as valid again. | |
1011 | */ | |
1012 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 1013 | nilfs_cleanup_super(sbi); |
783f6184 RK |
1014 | up_write(&nilfs->ns_sem); |
1015 | } else { | |
c5ca48aa | 1016 | __u64 features; |
e912a5b6 | 1017 | struct nilfs_root *root; |
c5ca48aa | 1018 | |
783f6184 RK |
1019 | /* |
1020 | * Mounting a RDONLY partition read-write, so reread and | |
1021 | * store the current valid flag. (It may have been changed | |
1022 | * by fsck since we originally mounted the partition.) | |
1023 | */ | |
c5ca48aa RK |
1024 | down_read(&nilfs->ns_sem); |
1025 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & | |
1026 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
1027 | up_read(&nilfs->ns_sem); | |
1028 | if (features) { | |
1029 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1030 | "remount RDWR because of unsupported optional " | |
1031 | "features (%llx)\n", | |
1032 | sb->s_id, (unsigned long long)features); | |
1033 | err = -EROFS; | |
1034 | goto restore_opts; | |
1035 | } | |
1036 | ||
783f6184 | 1037 | sb->s_flags &= ~MS_RDONLY; |
783f6184 | 1038 | |
e912a5b6 RK |
1039 | root = NILFS_I(sb->s_root->d_inode)->i_root; |
1040 | err = nilfs_attach_segment_constructor(sbi, root); | |
783f6184 | 1041 | if (err) |
e59399d0 | 1042 | goto restore_opts; |
783f6184 RK |
1043 | |
1044 | down_write(&nilfs->ns_sem); | |
1045 | nilfs_setup_super(sbi); | |
1046 | up_write(&nilfs->ns_sem); | |
783f6184 RK |
1047 | } |
1048 | out: | |
1049 | return 0; | |
1050 | ||
783f6184 RK |
1051 | restore_opts: |
1052 | sb->s_flags = old_sb_flags; | |
1053 | sbi->s_mount_opt = old_opts.mount_opt; | |
783f6184 RK |
1054 | return err; |
1055 | } | |
1056 | ||
1057 | struct nilfs_super_data { | |
1058 | struct block_device *bdev; | |
6dd47406 | 1059 | struct nilfs_sb_info *sbi; |
783f6184 RK |
1060 | __u64 cno; |
1061 | int flags; | |
1062 | }; | |
1063 | ||
1064 | /** | |
1065 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
1066 | * @data: mount options | |
1067 | * @sd: nilfs_super_data | |
1068 | */ | |
1069 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
1070 | { | |
1071 | char *p, *options = data; | |
1072 | substring_t args[MAX_OPT_ARGS]; | |
1073 | int option, token; | |
1074 | int ret = 0; | |
1075 | ||
1076 | do { | |
1077 | p = strsep(&options, ","); | |
1078 | if (p != NULL && *p) { | |
1079 | token = match_token(p, tokens, args); | |
1080 | if (token == Opt_snapshot) { | |
1081 | if (!(sd->flags & MS_RDONLY)) | |
1082 | ret++; | |
1083 | else { | |
1084 | ret = match_int(&args[0], &option); | |
1085 | if (!ret) { | |
1086 | if (option > 0) | |
1087 | sd->cno = option; | |
1088 | else | |
1089 | ret++; | |
1090 | } | |
1091 | } | |
1092 | } | |
1093 | if (ret) | |
1094 | printk(KERN_ERR | |
1095 | "NILFS: invalid mount option: %s\n", p); | |
1096 | } | |
1097 | if (!options) | |
1098 | break; | |
1099 | BUG_ON(options == data); | |
1100 | *(options - 1) = ','; | |
1101 | } while (!ret); | |
1102 | return ret; | |
1103 | } | |
1104 | ||
1105 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1106 | { | |
f11459ad | 1107 | s->s_bdev = data; |
783f6184 RK |
1108 | s->s_dev = s->s_bdev->bd_dev; |
1109 | return 0; | |
1110 | } | |
1111 | ||
1112 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 | 1113 | { |
f11459ad | 1114 | return (void *)s->s_bdev == data; |
783f6184 RK |
1115 | } |
1116 | ||
1117 | static int | |
1118 | nilfs_get_sb(struct file_system_type *fs_type, int flags, | |
1119 | const char *dev_name, void *data, struct vfsmount *mnt) | |
1120 | { | |
1121 | struct nilfs_super_data sd; | |
33c8e57c | 1122 | struct super_block *s; |
13e90559 | 1123 | fmode_t mode = FMODE_READ; |
f11459ad RK |
1124 | struct dentry *root_dentry; |
1125 | int err, s_new = false; | |
783f6184 | 1126 | |
13e90559 RK |
1127 | if (!(flags & MS_RDONLY)) |
1128 | mode |= FMODE_WRITE; | |
1129 | ||
1130 | sd.bdev = open_bdev_exclusive(dev_name, mode, fs_type); | |
d6d4c19c | 1131 | if (IS_ERR(sd.bdev)) |
783f6184 RK |
1132 | return PTR_ERR(sd.bdev); |
1133 | ||
783f6184 RK |
1134 | sd.cno = 0; |
1135 | sd.flags = flags; | |
1136 | if (nilfs_identify((char *)data, &sd)) { | |
1137 | err = -EINVAL; | |
1138 | goto failed; | |
1139 | } | |
1140 | ||
f11459ad | 1141 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev); |
33c8e57c RK |
1142 | if (IS_ERR(s)) { |
1143 | err = PTR_ERR(s); | |
348fe8da | 1144 | goto failed; |
783f6184 RK |
1145 | } |
1146 | ||
1147 | if (!s->s_root) { | |
1148 | char b[BDEVNAME_SIZE]; | |
1149 | ||
f11459ad RK |
1150 | s_new = true; |
1151 | ||
33c8e57c | 1152 | /* New superblock instance created */ |
783f6184 | 1153 | s->s_flags = flags; |
4571b82c | 1154 | s->s_mode = mode; |
783f6184 RK |
1155 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); |
1156 | sb_set_blocksize(s, block_size(sd.bdev)); | |
1157 | ||
348fe8da | 1158 | err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
783f6184 | 1159 | if (err) |
348fe8da | 1160 | goto failed_super; |
783f6184 RK |
1161 | |
1162 | s->s_flags |= MS_ACTIVE; | |
f11459ad RK |
1163 | } else if (!sd.cno) { |
1164 | int busy = false; | |
1165 | ||
1166 | if (nilfs_tree_was_touched(s->s_root)) { | |
1167 | busy = nilfs_try_to_shrink_tree(s->s_root); | |
1168 | if (busy && (flags ^ s->s_flags) & MS_RDONLY) { | |
1169 | printk(KERN_ERR "NILFS: the device already " | |
1170 | "has a %s mount.\n", | |
1171 | (s->s_flags & MS_RDONLY) ? | |
1172 | "read-only" : "read/write"); | |
1173 | err = -EBUSY; | |
1174 | goto failed_super; | |
1175 | } | |
1176 | } | |
1177 | if (!busy) { | |
1178 | /* | |
1179 | * Try remount to setup mount states if the current | |
1180 | * tree is not mounted and only snapshots use this sb. | |
1181 | */ | |
1182 | err = nilfs_remount(s, &flags, data); | |
1183 | if (err) | |
1184 | goto failed_super; | |
1185 | } | |
1186 | } | |
1187 | ||
1188 | if (sd.cno) { | |
1189 | err = nilfs_attach_snapshot(s, sd.cno, &root_dentry); | |
348fe8da | 1190 | if (err) |
f11459ad | 1191 | goto failed_super; |
f11459ad RK |
1192 | } else { |
1193 | root_dentry = dget(s->s_root); | |
783f6184 RK |
1194 | } |
1195 | ||
f11459ad | 1196 | if (!s_new) |
13e90559 | 1197 | close_bdev_exclusive(sd.bdev, mode); |
f11459ad RK |
1198 | |
1199 | mnt->mnt_sb = s; | |
1200 | mnt->mnt_root = root_dentry; | |
783f6184 RK |
1201 | return 0; |
1202 | ||
f11459ad RK |
1203 | failed_super: |
1204 | deactivate_locked_super(s); | |
783f6184 | 1205 | |
348fe8da RK |
1206 | failed: |
1207 | if (!s_new) | |
1208 | close_bdev_exclusive(sd.bdev, mode); | |
783f6184 RK |
1209 | return err; |
1210 | } | |
1211 | ||
783f6184 RK |
1212 | struct file_system_type nilfs_fs_type = { |
1213 | .owner = THIS_MODULE, | |
1214 | .name = "nilfs2", | |
1215 | .get_sb = nilfs_get_sb, | |
1216 | .kill_sb = kill_block_super, | |
1217 | .fs_flags = FS_REQUIRES_DEV, | |
1218 | }; | |
1219 | ||
41c88bd7 | 1220 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1221 | { |
41c88bd7 | 1222 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1223 | |
41c88bd7 LH |
1224 | INIT_LIST_HEAD(&ii->i_dirty); |
1225 | #ifdef CONFIG_NILFS_XATTR | |
1226 | init_rwsem(&ii->xattr_sem); | |
1227 | #endif | |
1228 | nilfs_btnode_cache_init_once(&ii->i_btnode_cache); | |
05d0e94b | 1229 | ii->i_bmap = &ii->i_bmap_data; |
41c88bd7 LH |
1230 | inode_init_once(&ii->vfs_inode); |
1231 | } | |
783f6184 | 1232 | |
41c88bd7 LH |
1233 | static void nilfs_segbuf_init_once(void *obj) |
1234 | { | |
1235 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1236 | } | |
783f6184 | 1237 | |
41c88bd7 LH |
1238 | static void nilfs_destroy_cachep(void) |
1239 | { | |
84cb0999 | 1240 | if (nilfs_inode_cachep) |
41c88bd7 | 1241 | kmem_cache_destroy(nilfs_inode_cachep); |
84cb0999 | 1242 | if (nilfs_transaction_cachep) |
41c88bd7 | 1243 | kmem_cache_destroy(nilfs_transaction_cachep); |
84cb0999 | 1244 | if (nilfs_segbuf_cachep) |
41c88bd7 | 1245 | kmem_cache_destroy(nilfs_segbuf_cachep); |
84cb0999 | 1246 | if (nilfs_btree_path_cache) |
41c88bd7 LH |
1247 | kmem_cache_destroy(nilfs_btree_path_cache); |
1248 | } | |
783f6184 | 1249 | |
41c88bd7 LH |
1250 | static int __init nilfs_init_cachep(void) |
1251 | { | |
1252 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1253 | sizeof(struct nilfs_inode_info), 0, | |
1254 | SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once); | |
1255 | if (!nilfs_inode_cachep) | |
1256 | goto fail; | |
1257 | ||
1258 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1259 | sizeof(struct nilfs_transaction_info), 0, | |
1260 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1261 | if (!nilfs_transaction_cachep) | |
1262 | goto fail; | |
1263 | ||
1264 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1265 | sizeof(struct nilfs_segment_buffer), 0, | |
1266 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1267 | if (!nilfs_segbuf_cachep) | |
1268 | goto fail; | |
1269 | ||
1270 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1271 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1272 | 0, 0, NULL); | |
1273 | if (!nilfs_btree_path_cache) | |
1274 | goto fail; | |
783f6184 RK |
1275 | |
1276 | return 0; | |
1277 | ||
41c88bd7 LH |
1278 | fail: |
1279 | nilfs_destroy_cachep(); | |
1280 | return -ENOMEM; | |
1281 | } | |
1282 | ||
1283 | static int __init init_nilfs_fs(void) | |
1284 | { | |
1285 | int err; | |
783f6184 | 1286 | |
41c88bd7 LH |
1287 | err = nilfs_init_cachep(); |
1288 | if (err) | |
1289 | goto fail; | |
783f6184 | 1290 | |
41c88bd7 LH |
1291 | err = register_filesystem(&nilfs_fs_type); |
1292 | if (err) | |
1293 | goto free_cachep; | |
783f6184 | 1294 | |
9f130263 | 1295 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1296 | return 0; |
783f6184 | 1297 | |
41c88bd7 LH |
1298 | free_cachep: |
1299 | nilfs_destroy_cachep(); | |
1300 | fail: | |
783f6184 RK |
1301 | return err; |
1302 | } | |
1303 | ||
1304 | static void __exit exit_nilfs_fs(void) | |
1305 | { | |
41c88bd7 | 1306 | nilfs_destroy_cachep(); |
783f6184 RK |
1307 | unregister_filesystem(&nilfs_fs_type); |
1308 | } | |
1309 | ||
1310 | module_init(init_nilfs_fs) | |
1311 | module_exit(exit_nilfs_fs) |