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> | |
51 | #include <linux/exportfs.h> | |
b58a285b JS |
52 | #include <linux/seq_file.h> |
53 | #include <linux/mount.h> | |
783f6184 RK |
54 | #include "nilfs.h" |
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; | |
158 | ii->vfs_inode.i_version = 1; | |
a53b4751 | 159 | nilfs_btnode_cache_init(&ii->i_btnode_cache, nilfs->ns_bdi); |
783f6184 RK |
160 | return &ii->vfs_inode; |
161 | } | |
162 | ||
a53b4751 RK |
163 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
164 | { | |
165 | return nilfs_alloc_inode_common(NILFS_SB(sb)->s_nilfs); | |
166 | } | |
167 | ||
783f6184 RK |
168 | void nilfs_destroy_inode(struct inode *inode) |
169 | { | |
b91c9a97 RK |
170 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
171 | ||
172 | if (mdi) { | |
173 | kfree(mdi->mi_bgl); /* kfree(NULL) is safe */ | |
174 | kfree(mdi); | |
175 | } | |
783f6184 RK |
176 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
177 | } | |
178 | ||
b2ac86e1 | 179 | static int nilfs_sync_super(struct nilfs_sb_info *sbi, int flag) |
783f6184 RK |
180 | { |
181 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
182 | int err; | |
783f6184 | 183 | |
783f6184 | 184 | retry: |
e339ad31 | 185 | set_buffer_dirty(nilfs->ns_sbh[0]); |
87e99511 CH |
186 | |
187 | if (nilfs_test_opt(sbi, BARRIER)) { | |
188 | err = __sync_dirty_buffer(nilfs->ns_sbh[0], | |
189 | WRITE_SYNC | WRITE_BARRIER); | |
190 | if (err == -EOPNOTSUPP) { | |
191 | nilfs_warning(sbi->s_super, __func__, | |
192 | "barrier-based sync failed. " | |
193 | "disabling barriers\n"); | |
194 | nilfs_clear_opt(sbi, BARRIER); | |
195 | goto retry; | |
196 | } | |
197 | } else { | |
198 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); | |
783f6184 | 199 | } |
87e99511 | 200 | |
e339ad31 | 201 | if (unlikely(err)) { |
783f6184 RK |
202 | printk(KERN_ERR |
203 | "NILFS: unable to write superblock (err=%d)\n", err); | |
e339ad31 | 204 | if (err == -EIO && nilfs->ns_sbh[1]) { |
b2ac86e1 JS |
205 | /* |
206 | * sbp[0] points to newer log than sbp[1], | |
207 | * so copy sbp[0] to sbp[1] to take over sbp[0]. | |
208 | */ | |
209 | memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0], | |
210 | nilfs->ns_sbsize); | |
e339ad31 RK |
211 | nilfs_fall_back_super_block(nilfs); |
212 | goto retry; | |
213 | } | |
214 | } else { | |
215 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; | |
216 | ||
b2ac86e1 JS |
217 | nilfs->ns_sbwcount++; |
218 | ||
e339ad31 RK |
219 | /* |
220 | * The latest segment becomes trailable from the position | |
221 | * written in superblock. | |
222 | */ | |
783f6184 | 223 | clear_nilfs_discontinued(nilfs); |
e339ad31 RK |
224 | |
225 | /* update GC protection for recent segments */ | |
226 | if (nilfs->ns_sbh[1]) { | |
b2ac86e1 | 227 | if (flag == NILFS_SB_COMMIT_ALL) { |
e339ad31 | 228 | set_buffer_dirty(nilfs->ns_sbh[1]); |
b2ac86e1 JS |
229 | if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0) |
230 | goto out; | |
e339ad31 | 231 | } |
b2ac86e1 JS |
232 | if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) < |
233 | le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno)) | |
234 | sbp = nilfs->ns_sbp[1]; | |
e339ad31 | 235 | } |
783f6184 | 236 | |
b2ac86e1 JS |
237 | spin_lock(&nilfs->ns_last_segment_lock); |
238 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); | |
239 | spin_unlock(&nilfs->ns_last_segment_lock); | |
240 | } | |
241 | out: | |
783f6184 RK |
242 | return err; |
243 | } | |
244 | ||
60f46b7e RK |
245 | void nilfs_set_log_cursor(struct nilfs_super_block *sbp, |
246 | struct the_nilfs *nilfs) | |
247 | { | |
248 | sector_t nfreeblocks; | |
249 | ||
250 | /* nilfs->ns_sem must be locked by the caller. */ | |
251 | nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
252 | sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
253 | ||
254 | spin_lock(&nilfs->ns_last_segment_lock); | |
255 | sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
256 | sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
257 | sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
258 | spin_unlock(&nilfs->ns_last_segment_lock); | |
259 | } | |
260 | ||
b2ac86e1 JS |
261 | struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *sbi, |
262 | int flip) | |
783f6184 RK |
263 | { |
264 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
e339ad31 | 265 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 266 | |
d26493b6 | 267 | /* nilfs->ns_sem must be locked by the caller. */ |
34cb9b5c | 268 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
d26493b6 JS |
269 | if (sbp[1] && |
270 | sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
b2ac86e1 | 271 | memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); |
d26493b6 | 272 | } else { |
e339ad31 RK |
273 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", |
274 | sbi->s_super->s_id); | |
d26493b6 | 275 | return NULL; |
e339ad31 | 276 | } |
b2ac86e1 JS |
277 | } else if (sbp[1] && |
278 | sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
279 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
e339ad31 | 280 | } |
b2ac86e1 JS |
281 | |
282 | if (flip && sbp[1]) | |
283 | nilfs_swap_super_block(nilfs); | |
284 | ||
d26493b6 JS |
285 | return sbp; |
286 | } | |
287 | ||
b2ac86e1 | 288 | int nilfs_commit_super(struct nilfs_sb_info *sbi, int flag) |
d26493b6 JS |
289 | { |
290 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
291 | struct nilfs_super_block **sbp = nilfs->ns_sbp; | |
292 | time_t t; | |
293 | ||
294 | /* nilfs->ns_sem must be locked by the caller. */ | |
e339ad31 | 295 | t = get_seconds(); |
b2ac86e1 | 296 | nilfs->ns_sbwtime = t; |
e339ad31 RK |
297 | sbp[0]->s_wtime = cpu_to_le64(t); |
298 | sbp[0]->s_sum = 0; | |
299 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
300 | (unsigned char *)sbp[0], | |
301 | nilfs->ns_sbsize)); | |
b2ac86e1 JS |
302 | if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) { |
303 | sbp[1]->s_wtime = sbp[0]->s_wtime; | |
304 | sbp[1]->s_sum = 0; | |
305 | sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
306 | (unsigned char *)sbp[1], | |
307 | nilfs->ns_sbsize)); | |
e339ad31 | 308 | } |
e605f0a7 | 309 | clear_nilfs_sb_dirty(nilfs); |
b2ac86e1 | 310 | return nilfs_sync_super(sbi, flag); |
783f6184 RK |
311 | } |
312 | ||
7ecaa46c RK |
313 | /** |
314 | * nilfs_cleanup_super() - write filesystem state for cleanup | |
315 | * @sbi: nilfs_sb_info to be unmounted or degraded to read-only | |
316 | * | |
317 | * This function restores state flags in the on-disk super block. | |
318 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the | |
319 | * filesystem was not clean previously. | |
320 | */ | |
321 | int nilfs_cleanup_super(struct nilfs_sb_info *sbi) | |
322 | { | |
d26493b6 | 323 | struct nilfs_super_block **sbp; |
b2ac86e1 | 324 | int flag = NILFS_SB_COMMIT; |
d26493b6 | 325 | int ret = -EIO; |
7ecaa46c | 326 | |
b2ac86e1 | 327 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
328 | if (sbp) { |
329 | sbp[0]->s_state = cpu_to_le16(sbi->s_nilfs->ns_mount_state); | |
b2ac86e1 JS |
330 | nilfs_set_log_cursor(sbp[0], sbi->s_nilfs); |
331 | if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { | |
332 | /* | |
333 | * make the "clean" flag also to the opposite | |
334 | * super block if both super blocks point to | |
335 | * the same checkpoint. | |
336 | */ | |
337 | sbp[1]->s_state = sbp[0]->s_state; | |
338 | flag = NILFS_SB_COMMIT_ALL; | |
339 | } | |
340 | ret = nilfs_commit_super(sbi, flag); | |
d26493b6 | 341 | } |
7ecaa46c RK |
342 | return ret; |
343 | } | |
344 | ||
783f6184 RK |
345 | static void nilfs_put_super(struct super_block *sb) |
346 | { | |
347 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
348 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
349 | ||
350 | nilfs_detach_segment_constructor(sbi); | |
351 | ||
352 | if (!(sb->s_flags & MS_RDONLY)) { | |
353 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 354 | nilfs_cleanup_super(sbi); |
783f6184 RK |
355 | up_write(&nilfs->ns_sem); |
356 | } | |
e59399d0 | 357 | down_write(&nilfs->ns_super_sem); |
3f82ff55 RK |
358 | if (nilfs->ns_current == sbi) |
359 | nilfs->ns_current = NULL; | |
e59399d0 | 360 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
361 | |
362 | nilfs_detach_checkpoint(sbi); | |
363 | put_nilfs(sbi->s_nilfs); | |
364 | sbi->s_super = NULL; | |
365 | sb->s_fs_info = NULL; | |
6dd47406 | 366 | nilfs_put_sbinfo(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 | ||
393 | int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno) | |
394 | { | |
395 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
396 | struct nilfs_checkpoint *raw_cp; | |
397 | struct buffer_head *bh_cp; | |
398 | int err; | |
399 | ||
e59399d0 | 400 | down_write(&nilfs->ns_super_sem); |
783f6184 | 401 | list_add(&sbi->s_list, &nilfs->ns_supers); |
e59399d0 | 402 | up_write(&nilfs->ns_super_sem); |
783f6184 | 403 | |
af4e3631 | 404 | err = -ENOMEM; |
79739565 | 405 | sbi->s_ifile = nilfs_ifile_new(sbi, nilfs->ns_inode_size); |
783f6184 | 406 | if (!sbi->s_ifile) |
af4e3631 | 407 | goto delist; |
783f6184 | 408 | |
1154ecbd | 409 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
410 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
411 | &bh_cp); | |
1154ecbd | 412 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
413 | if (unlikely(err)) { |
414 | if (err == -ENOENT || err == -EINVAL) { | |
415 | printk(KERN_ERR | |
416 | "NILFS: Invalid checkpoint " | |
417 | "(checkpoint number=%llu)\n", | |
418 | (unsigned long long)cno); | |
419 | err = -EINVAL; | |
420 | } | |
421 | goto failed; | |
422 | } | |
423 | err = nilfs_read_inode_common(sbi->s_ifile, &raw_cp->cp_ifile_inode); | |
424 | if (unlikely(err)) | |
425 | goto failed_bh; | |
426 | atomic_set(&sbi->s_inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); | |
427 | atomic_set(&sbi->s_blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); | |
428 | ||
429 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
430 | return 0; | |
431 | ||
432 | failed_bh: | |
433 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
434 | failed: | |
435 | nilfs_mdt_destroy(sbi->s_ifile); | |
436 | sbi->s_ifile = NULL; | |
437 | ||
af4e3631 | 438 | delist: |
e59399d0 | 439 | down_write(&nilfs->ns_super_sem); |
783f6184 | 440 | list_del_init(&sbi->s_list); |
e59399d0 | 441 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
442 | |
443 | return err; | |
444 | } | |
445 | ||
446 | void nilfs_detach_checkpoint(struct nilfs_sb_info *sbi) | |
447 | { | |
448 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
449 | ||
783f6184 RK |
450 | nilfs_mdt_destroy(sbi->s_ifile); |
451 | sbi->s_ifile = NULL; | |
e59399d0 | 452 | down_write(&nilfs->ns_super_sem); |
783f6184 | 453 | list_del_init(&sbi->s_list); |
e59399d0 | 454 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
455 | } |
456 | ||
783f6184 RK |
457 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
458 | { | |
459 | struct super_block *sb = dentry->d_sb; | |
460 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
c306af23 RK |
461 | struct the_nilfs *nilfs = sbi->s_nilfs; |
462 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
783f6184 RK |
463 | unsigned long long blocks; |
464 | unsigned long overhead; | |
465 | unsigned long nrsvblocks; | |
466 | sector_t nfreeblocks; | |
783f6184 RK |
467 | int err; |
468 | ||
469 | /* | |
470 | * Compute all of the segment blocks | |
471 | * | |
472 | * The blocks before first segment and after last segment | |
473 | * are excluded. | |
474 | */ | |
475 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
476 | - nilfs->ns_first_data_block; | |
477 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
478 | ||
479 | /* | |
480 | * Compute the overhead | |
481 | * | |
7a65004b | 482 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
483 | * We must count them as the overhead. |
484 | */ | |
485 | overhead = 0; | |
486 | ||
487 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
488 | if (unlikely(err)) | |
489 | return err; | |
490 | ||
491 | buf->f_type = NILFS_SUPER_MAGIC; | |
492 | buf->f_bsize = sb->s_blocksize; | |
493 | buf->f_blocks = blocks - overhead; | |
494 | buf->f_bfree = nfreeblocks; | |
495 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
496 | (buf->f_bfree - nrsvblocks) : 0; | |
497 | buf->f_files = atomic_read(&sbi->s_inodes_count); | |
498 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ | |
499 | buf->f_namelen = NILFS_NAME_LEN; | |
c306af23 RK |
500 | buf->f_fsid.val[0] = (u32)id; |
501 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
502 | ||
783f6184 RK |
503 | return 0; |
504 | } | |
505 | ||
b58a285b JS |
506 | static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
507 | { | |
508 | struct super_block *sb = vfs->mnt_sb; | |
509 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
510 | ||
511 | if (!nilfs_test_opt(sbi, BARRIER)) | |
c6b4d57d | 512 | seq_puts(seq, ",nobarrier"); |
b58a285b JS |
513 | if (nilfs_test_opt(sbi, SNAPSHOT)) |
514 | seq_printf(seq, ",cp=%llu", | |
515 | (unsigned long long int)sbi->s_snapshot_cno); | |
b58a285b | 516 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) |
c6b4d57d | 517 | seq_puts(seq, ",errors=panic"); |
277a6a34 | 518 | if (nilfs_test_opt(sbi, ERRORS_CONT)) |
c6b4d57d | 519 | seq_puts(seq, ",errors=continue"); |
b58a285b | 520 | if (nilfs_test_opt(sbi, STRICT_ORDER)) |
c6b4d57d | 521 | seq_puts(seq, ",order=strict"); |
0234576d | 522 | if (nilfs_test_opt(sbi, NORECOVERY)) |
c6b4d57d | 523 | seq_puts(seq, ",norecovery"); |
e902ec99 | 524 | if (nilfs_test_opt(sbi, DISCARD)) |
c6b4d57d | 525 | seq_puts(seq, ",discard"); |
b58a285b JS |
526 | |
527 | return 0; | |
528 | } | |
529 | ||
b87221de | 530 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
531 | .alloc_inode = nilfs_alloc_inode, |
532 | .destroy_inode = nilfs_destroy_inode, | |
533 | .dirty_inode = nilfs_dirty_inode, | |
534 | /* .write_inode = nilfs_write_inode, */ | |
535 | /* .put_inode = nilfs_put_inode, */ | |
536 | /* .drop_inode = nilfs_drop_inode, */ | |
6fd1e5c9 | 537 | .evict_inode = nilfs_evict_inode, |
783f6184 | 538 | .put_super = nilfs_put_super, |
1dfa2710 | 539 | /* .write_super = nilfs_write_super, */ |
783f6184 RK |
540 | .sync_fs = nilfs_sync_fs, |
541 | /* .write_super_lockfs */ | |
542 | /* .unlockfs */ | |
543 | .statfs = nilfs_statfs, | |
544 | .remount_fs = nilfs_remount, | |
783f6184 | 545 | /* .umount_begin */ |
b58a285b | 546 | .show_options = nilfs_show_options |
783f6184 RK |
547 | }; |
548 | ||
549 | static struct inode * | |
550 | nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation) | |
551 | { | |
552 | struct inode *inode; | |
553 | ||
554 | if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO && | |
555 | ino != NILFS_SKETCH_INO) | |
556 | return ERR_PTR(-ESTALE); | |
557 | ||
558 | inode = nilfs_iget(sb, ino); | |
559 | if (IS_ERR(inode)) | |
560 | return ERR_CAST(inode); | |
561 | if (generation && inode->i_generation != generation) { | |
562 | iput(inode); | |
563 | return ERR_PTR(-ESTALE); | |
564 | } | |
565 | ||
566 | return inode; | |
567 | } | |
568 | ||
569 | static struct dentry * | |
570 | nilfs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, | |
571 | int fh_type) | |
572 | { | |
573 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
574 | nilfs_nfs_get_inode); | |
575 | } | |
576 | ||
577 | static struct dentry * | |
578 | nilfs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, | |
579 | int fh_type) | |
580 | { | |
581 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
582 | nilfs_nfs_get_inode); | |
583 | } | |
584 | ||
ac4cfdd6 | 585 | static const struct export_operations nilfs_export_ops = { |
783f6184 RK |
586 | .fh_to_dentry = nilfs_fh_to_dentry, |
587 | .fh_to_parent = nilfs_fh_to_parent, | |
588 | .get_parent = nilfs_get_parent, | |
589 | }; | |
590 | ||
591 | enum { | |
592 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
773bc4f3 | 593 | Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
802d3177 | 594 | Opt_discard, Opt_nodiscard, Opt_err, |
783f6184 RK |
595 | }; |
596 | ||
597 | static match_table_t tokens = { | |
598 | {Opt_err_cont, "errors=continue"}, | |
599 | {Opt_err_panic, "errors=panic"}, | |
600 | {Opt_err_ro, "errors=remount-ro"}, | |
773bc4f3 | 601 | {Opt_barrier, "barrier"}, |
91f1953b | 602 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
603 | {Opt_snapshot, "cp=%u"}, |
604 | {Opt_order, "order=%s"}, | |
0234576d | 605 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 606 | {Opt_discard, "discard"}, |
802d3177 | 607 | {Opt_nodiscard, "nodiscard"}, |
783f6184 RK |
608 | {Opt_err, NULL} |
609 | }; | |
610 | ||
7c017457 | 611 | static int parse_options(char *options, struct super_block *sb, int is_remount) |
783f6184 RK |
612 | { |
613 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
614 | char *p; | |
615 | substring_t args[MAX_OPT_ARGS]; | |
616 | int option; | |
617 | ||
618 | if (!options) | |
619 | return 1; | |
620 | ||
621 | while ((p = strsep(&options, ",")) != NULL) { | |
622 | int token; | |
623 | if (!*p) | |
624 | continue; | |
625 | ||
626 | token = match_token(p, tokens, args); | |
627 | switch (token) { | |
773bc4f3 RK |
628 | case Opt_barrier: |
629 | nilfs_set_opt(sbi, BARRIER); | |
630 | break; | |
91f1953b JS |
631 | case Opt_nobarrier: |
632 | nilfs_clear_opt(sbi, BARRIER); | |
783f6184 RK |
633 | break; |
634 | case Opt_order: | |
635 | if (strcmp(args[0].from, "relaxed") == 0) | |
636 | /* Ordered data semantics */ | |
637 | nilfs_clear_opt(sbi, STRICT_ORDER); | |
638 | else if (strcmp(args[0].from, "strict") == 0) | |
639 | /* Strict in-order semantics */ | |
640 | nilfs_set_opt(sbi, STRICT_ORDER); | |
641 | else | |
642 | return 0; | |
643 | break; | |
644 | case Opt_err_panic: | |
645 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC); | |
646 | break; | |
647 | case Opt_err_ro: | |
648 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO); | |
649 | break; | |
650 | case Opt_err_cont: | |
651 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT); | |
652 | break; | |
653 | case Opt_snapshot: | |
654 | if (match_int(&args[0], &option) || option <= 0) | |
655 | return 0; | |
7c017457 RK |
656 | if (is_remount) { |
657 | if (!nilfs_test_opt(sbi, SNAPSHOT)) { | |
658 | printk(KERN_ERR | |
659 | "NILFS: cannot change regular " | |
660 | "mount to snapshot.\n"); | |
661 | return 0; | |
662 | } else if (option != sbi->s_snapshot_cno) { | |
663 | printk(KERN_ERR | |
664 | "NILFS: cannot remount to a " | |
665 | "different snapshot.\n"); | |
666 | return 0; | |
667 | } | |
668 | break; | |
669 | } | |
670 | if (!(sb->s_flags & MS_RDONLY)) { | |
671 | printk(KERN_ERR "NILFS: cannot mount snapshot " | |
672 | "read/write. A read-only option is " | |
673 | "required.\n"); | |
783f6184 | 674 | return 0; |
7c017457 | 675 | } |
783f6184 RK |
676 | sbi->s_snapshot_cno = option; |
677 | nilfs_set_opt(sbi, SNAPSHOT); | |
678 | break; | |
0234576d RK |
679 | case Opt_norecovery: |
680 | nilfs_set_opt(sbi, NORECOVERY); | |
681 | break; | |
e902ec99 JS |
682 | case Opt_discard: |
683 | nilfs_set_opt(sbi, DISCARD); | |
684 | break; | |
802d3177 RK |
685 | case Opt_nodiscard: |
686 | nilfs_clear_opt(sbi, DISCARD); | |
687 | break; | |
783f6184 RK |
688 | default: |
689 | printk(KERN_ERR | |
690 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
691 | return 0; | |
692 | } | |
693 | } | |
694 | return 1; | |
695 | } | |
696 | ||
697 | static inline void | |
698 | nilfs_set_default_options(struct nilfs_sb_info *sbi, | |
699 | struct nilfs_super_block *sbp) | |
700 | { | |
701 | sbi->s_mount_opt = | |
277a6a34 | 702 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
703 | } |
704 | ||
705 | static int nilfs_setup_super(struct nilfs_sb_info *sbi) | |
706 | { | |
707 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 JS |
708 | struct nilfs_super_block **sbp; |
709 | int max_mnt_count; | |
710 | int mnt_count; | |
711 | ||
712 | /* nilfs->ns_sem must be locked by the caller. */ | |
b2ac86e1 | 713 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
714 | if (!sbp) |
715 | return -EIO; | |
716 | ||
717 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); | |
718 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); | |
783f6184 | 719 | |
f50a4c81 | 720 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
783f6184 RK |
721 | printk(KERN_WARNING |
722 | "NILFS warning: mounting fs with errors\n"); | |
723 | #if 0 | |
724 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
725 | printk(KERN_WARNING | |
726 | "NILFS warning: maximal mount count reached\n"); | |
727 | #endif | |
728 | } | |
729 | if (!max_mnt_count) | |
d26493b6 | 730 | sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
783f6184 | 731 | |
d26493b6 JS |
732 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
733 | sbp[0]->s_state = | |
734 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); | |
735 | sbp[0]->s_mtime = cpu_to_le64(get_seconds()); | |
b2ac86e1 JS |
736 | /* synchronize sbp[1] with sbp[0] */ |
737 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
738 | return nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL); | |
783f6184 RK |
739 | } |
740 | ||
e339ad31 RK |
741 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
742 | u64 pos, int blocksize, | |
743 | struct buffer_head **pbh) | |
783f6184 | 744 | { |
e339ad31 RK |
745 | unsigned long long sb_index = pos; |
746 | unsigned long offset; | |
783f6184 | 747 | |
e339ad31 | 748 | offset = do_div(sb_index, blocksize); |
783f6184 | 749 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 750 | if (!*pbh) |
783f6184 | 751 | return NULL; |
783f6184 RK |
752 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
753 | } | |
754 | ||
783f6184 RK |
755 | int nilfs_store_magic_and_option(struct super_block *sb, |
756 | struct nilfs_super_block *sbp, | |
757 | char *data) | |
758 | { | |
759 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
760 | ||
783f6184 RK |
761 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
762 | ||
763 | /* FS independent flags */ | |
764 | #ifdef NILFS_ATIME_DISABLE | |
765 | sb->s_flags |= MS_NOATIME; | |
766 | #endif | |
767 | ||
783f6184 RK |
768 | nilfs_set_default_options(sbi, sbp); |
769 | ||
770 | sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid); | |
771 | sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid); | |
772 | sbi->s_interval = le32_to_cpu(sbp->s_c_interval); | |
773 | sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max); | |
774 | ||
7c017457 | 775 | return !parse_options(data, sb, 0) ? -EINVAL : 0 ; |
783f6184 RK |
776 | } |
777 | ||
c5ca48aa RK |
778 | int nilfs_check_feature_compatibility(struct super_block *sb, |
779 | struct nilfs_super_block *sbp) | |
780 | { | |
781 | __u64 features; | |
782 | ||
783 | features = le64_to_cpu(sbp->s_feature_incompat) & | |
784 | ~NILFS_FEATURE_INCOMPAT_SUPP; | |
785 | if (features) { | |
786 | printk(KERN_ERR "NILFS: couldn't mount because of unsupported " | |
787 | "optional features (%llx)\n", | |
788 | (unsigned long long)features); | |
789 | return -EINVAL; | |
790 | } | |
791 | features = le64_to_cpu(sbp->s_feature_compat_ro) & | |
792 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
793 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
794 | printk(KERN_ERR "NILFS: couldn't mount RDWR because of " | |
795 | "unsupported optional features (%llx)\n", | |
796 | (unsigned long long)features); | |
797 | return -EINVAL; | |
798 | } | |
799 | return 0; | |
800 | } | |
801 | ||
783f6184 RK |
802 | /** |
803 | * nilfs_fill_super() - initialize a super block instance | |
804 | * @sb: super_block | |
805 | * @data: mount options | |
806 | * @silent: silent mode flag | |
807 | * @nilfs: the_nilfs struct | |
808 | * | |
aa7dfb89 | 809 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
810 | * So, the recovery process is protected from other simultaneous mounts. |
811 | */ | |
812 | static int | |
813 | nilfs_fill_super(struct super_block *sb, void *data, int silent, | |
814 | struct the_nilfs *nilfs) | |
815 | { | |
816 | struct nilfs_sb_info *sbi; | |
817 | struct inode *root; | |
818 | __u64 cno; | |
819 | int err; | |
820 | ||
821 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
822 | if (!sbi) | |
823 | return -ENOMEM; | |
824 | ||
825 | sb->s_fs_info = sbi; | |
826 | ||
827 | get_nilfs(nilfs); | |
828 | sbi->s_nilfs = nilfs; | |
829 | sbi->s_super = sb; | |
6dd47406 | 830 | atomic_set(&sbi->s_count, 1); |
783f6184 RK |
831 | |
832 | err = init_nilfs(nilfs, sbi, (char *)data); | |
833 | if (err) | |
834 | goto failed_sbi; | |
835 | ||
836 | spin_lock_init(&sbi->s_inode_lock); | |
837 | INIT_LIST_HEAD(&sbi->s_dirty_files); | |
838 | INIT_LIST_HEAD(&sbi->s_list); | |
839 | ||
840 | /* | |
841 | * Following initialization is overlapped because | |
842 | * nilfs_sb_info structure has been cleared at the beginning. | |
843 | * But we reserve them to keep our interest and make ready | |
844 | * for the future change. | |
845 | */ | |
846 | get_random_bytes(&sbi->s_next_generation, | |
847 | sizeof(sbi->s_next_generation)); | |
848 | spin_lock_init(&sbi->s_next_gen_lock); | |
849 | ||
850 | sb->s_op = &nilfs_sops; | |
851 | sb->s_export_op = &nilfs_export_ops; | |
852 | sb->s_root = NULL; | |
61239230 | 853 | sb->s_time_gran = 1; |
973bec34 | 854 | sb->s_bdi = nilfs->ns_bdi; |
783f6184 | 855 | |
f50a4c81 RK |
856 | err = load_nilfs(nilfs, sbi); |
857 | if (err) | |
858 | goto failed_sbi; | |
859 | ||
783f6184 RK |
860 | cno = nilfs_last_cno(nilfs); |
861 | ||
862 | if (sb->s_flags & MS_RDONLY) { | |
863 | if (nilfs_test_opt(sbi, SNAPSHOT)) { | |
43be0ec0 | 864 | down_read(&nilfs->ns_segctor_sem); |
1f5abe7e RK |
865 | err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, |
866 | sbi->s_snapshot_cno); | |
43be0ec0 ZY |
867 | up_read(&nilfs->ns_segctor_sem); |
868 | if (err < 0) { | |
869 | if (err == -ENOENT) | |
870 | err = -EINVAL; | |
1f5abe7e | 871 | goto failed_sbi; |
43be0ec0 | 872 | } |
1f5abe7e | 873 | if (!err) { |
783f6184 RK |
874 | printk(KERN_ERR |
875 | "NILFS: The specified checkpoint is " | |
876 | "not a snapshot " | |
877 | "(checkpoint number=%llu).\n", | |
878 | (unsigned long long)sbi->s_snapshot_cno); | |
879 | err = -EINVAL; | |
880 | goto failed_sbi; | |
881 | } | |
882 | cno = sbi->s_snapshot_cno; | |
d240e067 | 883 | } |
783f6184 RK |
884 | } |
885 | ||
886 | err = nilfs_attach_checkpoint(sbi, cno); | |
887 | if (err) { | |
888 | printk(KERN_ERR "NILFS: error loading a checkpoint" | |
889 | " (checkpoint number=%llu).\n", (unsigned long long)cno); | |
890 | goto failed_sbi; | |
891 | } | |
892 | ||
893 | if (!(sb->s_flags & MS_RDONLY)) { | |
cece5520 | 894 | err = nilfs_attach_segment_constructor(sbi); |
783f6184 RK |
895 | if (err) |
896 | goto failed_checkpoint; | |
897 | } | |
898 | ||
899 | root = nilfs_iget(sb, NILFS_ROOT_INO); | |
900 | if (IS_ERR(root)) { | |
901 | printk(KERN_ERR "NILFS: get root inode failed\n"); | |
902 | err = PTR_ERR(root); | |
903 | goto failed_segctor; | |
904 | } | |
905 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
906 | iput(root); | |
907 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); | |
908 | err = -EINVAL; | |
909 | goto failed_segctor; | |
910 | } | |
911 | sb->s_root = d_alloc_root(root); | |
912 | if (!sb->s_root) { | |
913 | iput(root); | |
914 | printk(KERN_ERR "NILFS: get root dentry failed\n"); | |
915 | err = -ENOMEM; | |
916 | goto failed_segctor; | |
917 | } | |
918 | ||
919 | if (!(sb->s_flags & MS_RDONLY)) { | |
920 | down_write(&nilfs->ns_sem); | |
921 | nilfs_setup_super(sbi); | |
922 | up_write(&nilfs->ns_sem); | |
923 | } | |
924 | ||
e59399d0 | 925 | down_write(&nilfs->ns_super_sem); |
3f82ff55 RK |
926 | if (!nilfs_test_opt(sbi, SNAPSHOT)) |
927 | nilfs->ns_current = sbi; | |
e59399d0 | 928 | up_write(&nilfs->ns_super_sem); |
3f82ff55 | 929 | |
783f6184 RK |
930 | return 0; |
931 | ||
783f6184 RK |
932 | failed_segctor: |
933 | nilfs_detach_segment_constructor(sbi); | |
934 | ||
935 | failed_checkpoint: | |
936 | nilfs_detach_checkpoint(sbi); | |
937 | ||
938 | failed_sbi: | |
939 | put_nilfs(nilfs); | |
940 | sb->s_fs_info = NULL; | |
6dd47406 | 941 | nilfs_put_sbinfo(sbi); |
783f6184 RK |
942 | return err; |
943 | } | |
944 | ||
945 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
946 | { | |
947 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
783f6184 RK |
948 | struct the_nilfs *nilfs = sbi->s_nilfs; |
949 | unsigned long old_sb_flags; | |
950 | struct nilfs_mount_options old_opts; | |
d240e067 | 951 | int was_snapshot, err; |
783f6184 | 952 | |
e59399d0 | 953 | down_write(&nilfs->ns_super_sem); |
783f6184 RK |
954 | old_sb_flags = sb->s_flags; |
955 | old_opts.mount_opt = sbi->s_mount_opt; | |
956 | old_opts.snapshot_cno = sbi->s_snapshot_cno; | |
d240e067 | 957 | was_snapshot = nilfs_test_opt(sbi, SNAPSHOT); |
783f6184 | 958 | |
7c017457 | 959 | if (!parse_options(data, sb, 1)) { |
783f6184 RK |
960 | err = -EINVAL; |
961 | goto restore_opts; | |
962 | } | |
963 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); | |
964 | ||
d240e067 | 965 | err = -EINVAL; |
7c017457 RK |
966 | if (was_snapshot && !(*flags & MS_RDONLY)) { |
967 | printk(KERN_ERR "NILFS (device %s): cannot remount snapshot " | |
968 | "read/write.\n", sb->s_id); | |
969 | goto restore_opts; | |
783f6184 RK |
970 | } |
971 | ||
0234576d RK |
972 | if (!nilfs_valid_fs(nilfs)) { |
973 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
974 | "remount because the filesystem is in an " | |
975 | "incomplete recovery state.\n", sb->s_id); | |
0234576d RK |
976 | goto restore_opts; |
977 | } | |
978 | ||
783f6184 RK |
979 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
980 | goto out; | |
981 | if (*flags & MS_RDONLY) { | |
982 | /* Shutting down the segment constructor */ | |
983 | nilfs_detach_segment_constructor(sbi); | |
984 | sb->s_flags |= MS_RDONLY; | |
985 | ||
783f6184 RK |
986 | /* |
987 | * Remounting a valid RW partition RDONLY, so set | |
988 | * the RDONLY flag and then mark the partition as valid again. | |
989 | */ | |
990 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 991 | nilfs_cleanup_super(sbi); |
783f6184 RK |
992 | up_write(&nilfs->ns_sem); |
993 | } else { | |
c5ca48aa RK |
994 | __u64 features; |
995 | ||
783f6184 RK |
996 | /* |
997 | * Mounting a RDONLY partition read-write, so reread and | |
998 | * store the current valid flag. (It may have been changed | |
999 | * by fsck since we originally mounted the partition.) | |
1000 | */ | |
c5ca48aa RK |
1001 | down_read(&nilfs->ns_sem); |
1002 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & | |
1003 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
1004 | up_read(&nilfs->ns_sem); | |
1005 | if (features) { | |
1006 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1007 | "remount RDWR because of unsupported optional " | |
1008 | "features (%llx)\n", | |
1009 | sb->s_id, (unsigned long long)features); | |
1010 | err = -EROFS; | |
1011 | goto restore_opts; | |
1012 | } | |
1013 | ||
783f6184 | 1014 | sb->s_flags &= ~MS_RDONLY; |
783f6184 | 1015 | |
cece5520 | 1016 | err = nilfs_attach_segment_constructor(sbi); |
783f6184 | 1017 | if (err) |
e59399d0 | 1018 | goto restore_opts; |
783f6184 RK |
1019 | |
1020 | down_write(&nilfs->ns_sem); | |
1021 | nilfs_setup_super(sbi); | |
1022 | up_write(&nilfs->ns_sem); | |
783f6184 RK |
1023 | } |
1024 | out: | |
e59399d0 | 1025 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
1026 | return 0; |
1027 | ||
783f6184 RK |
1028 | restore_opts: |
1029 | sb->s_flags = old_sb_flags; | |
1030 | sbi->s_mount_opt = old_opts.mount_opt; | |
1031 | sbi->s_snapshot_cno = old_opts.snapshot_cno; | |
e59399d0 | 1032 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
1033 | return err; |
1034 | } | |
1035 | ||
1036 | struct nilfs_super_data { | |
1037 | struct block_device *bdev; | |
6dd47406 | 1038 | struct nilfs_sb_info *sbi; |
783f6184 RK |
1039 | __u64 cno; |
1040 | int flags; | |
1041 | }; | |
1042 | ||
1043 | /** | |
1044 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
1045 | * @data: mount options | |
1046 | * @sd: nilfs_super_data | |
1047 | */ | |
1048 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
1049 | { | |
1050 | char *p, *options = data; | |
1051 | substring_t args[MAX_OPT_ARGS]; | |
1052 | int option, token; | |
1053 | int ret = 0; | |
1054 | ||
1055 | do { | |
1056 | p = strsep(&options, ","); | |
1057 | if (p != NULL && *p) { | |
1058 | token = match_token(p, tokens, args); | |
1059 | if (token == Opt_snapshot) { | |
1060 | if (!(sd->flags & MS_RDONLY)) | |
1061 | ret++; | |
1062 | else { | |
1063 | ret = match_int(&args[0], &option); | |
1064 | if (!ret) { | |
1065 | if (option > 0) | |
1066 | sd->cno = option; | |
1067 | else | |
1068 | ret++; | |
1069 | } | |
1070 | } | |
1071 | } | |
1072 | if (ret) | |
1073 | printk(KERN_ERR | |
1074 | "NILFS: invalid mount option: %s\n", p); | |
1075 | } | |
1076 | if (!options) | |
1077 | break; | |
1078 | BUG_ON(options == data); | |
1079 | *(options - 1) = ','; | |
1080 | } while (!ret); | |
1081 | return ret; | |
1082 | } | |
1083 | ||
1084 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1085 | { | |
1086 | struct nilfs_super_data *sd = data; | |
1087 | ||
1088 | s->s_bdev = sd->bdev; | |
1089 | s->s_dev = s->s_bdev->bd_dev; | |
1090 | return 0; | |
1091 | } | |
1092 | ||
1093 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 RK |
1094 | { |
1095 | struct nilfs_super_data *sd = data; | |
6dd47406 RK |
1096 | |
1097 | return sd->sbi && s->s_fs_info == (void *)sd->sbi; | |
783f6184 RK |
1098 | } |
1099 | ||
1100 | static int | |
1101 | nilfs_get_sb(struct file_system_type *fs_type, int flags, | |
1102 | const char *dev_name, void *data, struct vfsmount *mnt) | |
1103 | { | |
1104 | struct nilfs_super_data sd; | |
33c8e57c | 1105 | struct super_block *s; |
13e90559 | 1106 | fmode_t mode = FMODE_READ; |
33c8e57c | 1107 | struct the_nilfs *nilfs; |
783f6184 RK |
1108 | int err, need_to_close = 1; |
1109 | ||
13e90559 RK |
1110 | if (!(flags & MS_RDONLY)) |
1111 | mode |= FMODE_WRITE; | |
1112 | ||
1113 | sd.bdev = open_bdev_exclusive(dev_name, mode, fs_type); | |
d6d4c19c | 1114 | if (IS_ERR(sd.bdev)) |
783f6184 RK |
1115 | return PTR_ERR(sd.bdev); |
1116 | ||
1117 | /* | |
1118 | * To get mount instance using sget() vfs-routine, NILFS needs | |
1119 | * much more information than normal filesystems to identify mount | |
1120 | * instance. For snapshot mounts, not only a mount type (ro-mount | |
1121 | * or rw-mount) but also a checkpoint number is required. | |
783f6184 RK |
1122 | */ |
1123 | sd.cno = 0; | |
1124 | sd.flags = flags; | |
1125 | if (nilfs_identify((char *)data, &sd)) { | |
1126 | err = -EINVAL; | |
1127 | goto failed; | |
1128 | } | |
1129 | ||
33c8e57c RK |
1130 | nilfs = find_or_create_nilfs(sd.bdev); |
1131 | if (!nilfs) { | |
1132 | err = -ENOMEM; | |
1133 | goto failed; | |
1134 | } | |
1135 | ||
aa7dfb89 | 1136 | mutex_lock(&nilfs->ns_mount_mutex); |
3f82ff55 RK |
1137 | |
1138 | if (!sd.cno) { | |
1139 | /* | |
1140 | * Check if an exclusive mount exists or not. | |
1141 | * Snapshot mounts coexist with a current mount | |
1142 | * (i.e. rw-mount or ro-mount), whereas rw-mount and | |
1143 | * ro-mount are mutually exclusive. | |
1144 | */ | |
e59399d0 | 1145 | down_read(&nilfs->ns_super_sem); |
3f82ff55 RK |
1146 | if (nilfs->ns_current && |
1147 | ((nilfs->ns_current->s_super->s_flags ^ flags) | |
1148 | & MS_RDONLY)) { | |
e59399d0 | 1149 | up_read(&nilfs->ns_super_sem); |
3f82ff55 RK |
1150 | err = -EBUSY; |
1151 | goto failed_unlock; | |
1152 | } | |
e59399d0 | 1153 | up_read(&nilfs->ns_super_sem); |
783f6184 RK |
1154 | } |
1155 | ||
1156 | /* | |
6dd47406 | 1157 | * Find existing nilfs_sb_info struct |
783f6184 | 1158 | */ |
6dd47406 RK |
1159 | sd.sbi = nilfs_find_sbinfo(nilfs, !(flags & MS_RDONLY), sd.cno); |
1160 | ||
6dd47406 RK |
1161 | /* |
1162 | * Get super block instance holding the nilfs_sb_info struct. | |
1163 | * A new instance is allocated if no existing mount is present or | |
1164 | * existing instance has been unmounted. | |
1165 | */ | |
33c8e57c | 1166 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, &sd); |
6dd47406 RK |
1167 | if (sd.sbi) |
1168 | nilfs_put_sbinfo(sd.sbi); | |
1169 | ||
33c8e57c RK |
1170 | if (IS_ERR(s)) { |
1171 | err = PTR_ERR(s); | |
1172 | goto failed_unlock; | |
783f6184 RK |
1173 | } |
1174 | ||
1175 | if (!s->s_root) { | |
1176 | char b[BDEVNAME_SIZE]; | |
1177 | ||
33c8e57c | 1178 | /* New superblock instance created */ |
783f6184 | 1179 | s->s_flags = flags; |
4571b82c | 1180 | s->s_mode = mode; |
783f6184 RK |
1181 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); |
1182 | sb_set_blocksize(s, block_size(sd.bdev)); | |
1183 | ||
e2d1591a RK |
1184 | err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0, |
1185 | nilfs); | |
783f6184 RK |
1186 | if (err) |
1187 | goto cancel_new; | |
1188 | ||
1189 | s->s_flags |= MS_ACTIVE; | |
1190 | need_to_close = 0; | |
783f6184 RK |
1191 | } |
1192 | ||
aa7dfb89 | 1193 | mutex_unlock(&nilfs->ns_mount_mutex); |
783f6184 RK |
1194 | put_nilfs(nilfs); |
1195 | if (need_to_close) | |
13e90559 | 1196 | close_bdev_exclusive(sd.bdev, mode); |
783f6184 RK |
1197 | simple_set_mnt(mnt, s); |
1198 | return 0; | |
1199 | ||
783f6184 | 1200 | failed_unlock: |
aa7dfb89 | 1201 | mutex_unlock(&nilfs->ns_mount_mutex); |
33c8e57c | 1202 | put_nilfs(nilfs); |
783f6184 | 1203 | failed: |
13e90559 | 1204 | close_bdev_exclusive(sd.bdev, mode); |
783f6184 RK |
1205 | return err; |
1206 | ||
1207 | cancel_new: | |
1208 | /* Abandoning the newly allocated superblock */ | |
aa7dfb89 | 1209 | mutex_unlock(&nilfs->ns_mount_mutex); |
33c8e57c | 1210 | put_nilfs(nilfs); |
a95161aa | 1211 | deactivate_locked_super(s); |
783f6184 | 1212 | /* |
b87ca919 | 1213 | * deactivate_locked_super() invokes close_bdev_exclusive(). |
783f6184 | 1214 | * We must finish all post-cleaning before this call; |
aa7dfb89 | 1215 | * put_nilfs() needs the block device. |
783f6184 RK |
1216 | */ |
1217 | return err; | |
1218 | } | |
1219 | ||
783f6184 RK |
1220 | struct file_system_type nilfs_fs_type = { |
1221 | .owner = THIS_MODULE, | |
1222 | .name = "nilfs2", | |
1223 | .get_sb = nilfs_get_sb, | |
1224 | .kill_sb = kill_block_super, | |
1225 | .fs_flags = FS_REQUIRES_DEV, | |
1226 | }; | |
1227 | ||
41c88bd7 | 1228 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1229 | { |
41c88bd7 | 1230 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1231 | |
41c88bd7 LH |
1232 | INIT_LIST_HEAD(&ii->i_dirty); |
1233 | #ifdef CONFIG_NILFS_XATTR | |
1234 | init_rwsem(&ii->xattr_sem); | |
1235 | #endif | |
1236 | nilfs_btnode_cache_init_once(&ii->i_btnode_cache); | |
05d0e94b | 1237 | ii->i_bmap = &ii->i_bmap_data; |
41c88bd7 LH |
1238 | inode_init_once(&ii->vfs_inode); |
1239 | } | |
783f6184 | 1240 | |
41c88bd7 LH |
1241 | static void nilfs_segbuf_init_once(void *obj) |
1242 | { | |
1243 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1244 | } | |
783f6184 | 1245 | |
41c88bd7 LH |
1246 | static void nilfs_destroy_cachep(void) |
1247 | { | |
84cb0999 | 1248 | if (nilfs_inode_cachep) |
41c88bd7 | 1249 | kmem_cache_destroy(nilfs_inode_cachep); |
84cb0999 | 1250 | if (nilfs_transaction_cachep) |
41c88bd7 | 1251 | kmem_cache_destroy(nilfs_transaction_cachep); |
84cb0999 | 1252 | if (nilfs_segbuf_cachep) |
41c88bd7 | 1253 | kmem_cache_destroy(nilfs_segbuf_cachep); |
84cb0999 | 1254 | if (nilfs_btree_path_cache) |
41c88bd7 LH |
1255 | kmem_cache_destroy(nilfs_btree_path_cache); |
1256 | } | |
783f6184 | 1257 | |
41c88bd7 LH |
1258 | static int __init nilfs_init_cachep(void) |
1259 | { | |
1260 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1261 | sizeof(struct nilfs_inode_info), 0, | |
1262 | SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once); | |
1263 | if (!nilfs_inode_cachep) | |
1264 | goto fail; | |
1265 | ||
1266 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1267 | sizeof(struct nilfs_transaction_info), 0, | |
1268 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1269 | if (!nilfs_transaction_cachep) | |
1270 | goto fail; | |
1271 | ||
1272 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1273 | sizeof(struct nilfs_segment_buffer), 0, | |
1274 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1275 | if (!nilfs_segbuf_cachep) | |
1276 | goto fail; | |
1277 | ||
1278 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1279 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1280 | 0, 0, NULL); | |
1281 | if (!nilfs_btree_path_cache) | |
1282 | goto fail; | |
783f6184 RK |
1283 | |
1284 | return 0; | |
1285 | ||
41c88bd7 LH |
1286 | fail: |
1287 | nilfs_destroy_cachep(); | |
1288 | return -ENOMEM; | |
1289 | } | |
1290 | ||
1291 | static int __init init_nilfs_fs(void) | |
1292 | { | |
1293 | int err; | |
783f6184 | 1294 | |
41c88bd7 LH |
1295 | err = nilfs_init_cachep(); |
1296 | if (err) | |
1297 | goto fail; | |
783f6184 | 1298 | |
41c88bd7 LH |
1299 | err = register_filesystem(&nilfs_fs_type); |
1300 | if (err) | |
1301 | goto free_cachep; | |
783f6184 | 1302 | |
9f130263 | 1303 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1304 | return 0; |
783f6184 | 1305 | |
41c88bd7 LH |
1306 | free_cachep: |
1307 | nilfs_destroy_cachep(); | |
1308 | fail: | |
783f6184 RK |
1309 | return err; |
1310 | } | |
1311 | ||
1312 | static void __exit exit_nilfs_fs(void) | |
1313 | { | |
41c88bd7 | 1314 | nilfs_destroy_cachep(); |
783f6184 RK |
1315 | unregister_filesystem(&nilfs_fs_type); |
1316 | } | |
1317 | ||
1318 | module_init(init_nilfs_fs) | |
1319 | module_exit(exit_nilfs_fs) |