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> | |
48 | #include <linux/smp_lock.h> | |
49 | #include <linux/vfs.h> | |
50 | #include <linux/writeback.h> | |
51 | #include <linux/kobject.h> | |
52 | #include <linux/exportfs.h> | |
b58a285b JS |
53 | #include <linux/seq_file.h> |
54 | #include <linux/mount.h> | |
783f6184 RK |
55 | #include "nilfs.h" |
56 | #include "mdt.h" | |
57 | #include "alloc.h" | |
58 | #include "page.h" | |
59 | #include "cpfile.h" | |
60 | #include "ifile.h" | |
61 | #include "dat.h" | |
62 | #include "segment.h" | |
63 | #include "segbuf.h" | |
64 | ||
65 | MODULE_AUTHOR("NTT Corp."); | |
66 | MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem " | |
67 | "(NILFS)"); | |
783f6184 RK |
68 | MODULE_LICENSE("GPL"); |
69 | ||
41c88bd7 LH |
70 | struct kmem_cache *nilfs_inode_cachep; |
71 | struct kmem_cache *nilfs_transaction_cachep; | |
72 | struct kmem_cache *nilfs_segbuf_cachep; | |
73 | struct kmem_cache *nilfs_btree_path_cache; | |
74 | ||
783f6184 | 75 | static int nilfs_remount(struct super_block *sb, int *flags, char *data); |
783f6184 | 76 | |
c8a11c8a RK |
77 | static void nilfs_set_error(struct nilfs_sb_info *sbi) |
78 | { | |
79 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 | 80 | struct nilfs_super_block **sbp; |
c8a11c8a RK |
81 | |
82 | down_write(&nilfs->ns_sem); | |
83 | if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { | |
84 | nilfs->ns_mount_state |= NILFS_ERROR_FS; | |
b2ac86e1 | 85 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
86 | if (likely(sbp)) { |
87 | sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
b2ac86e1 JS |
88 | if (sbp[1]) |
89 | sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
90 | nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL); | |
d26493b6 | 91 | } |
c8a11c8a RK |
92 | } |
93 | up_write(&nilfs->ns_sem); | |
94 | } | |
95 | ||
783f6184 RK |
96 | /** |
97 | * nilfs_error() - report failure condition on a filesystem | |
98 | * | |
99 | * nilfs_error() sets an ERROR_FS flag on the superblock as well as | |
100 | * reporting an error message. It should be called when NILFS detects | |
101 | * incoherences or defects of meta data on disk. As for sustainable | |
102 | * errors such as a single-shot I/O error, nilfs_warning() or the printk() | |
103 | * function should be used instead. | |
104 | * | |
105 | * The segment constructor must not call this function because it can | |
106 | * kill itself. | |
107 | */ | |
108 | void nilfs_error(struct super_block *sb, const char *function, | |
109 | const char *fmt, ...) | |
110 | { | |
111 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
112 | va_list args; | |
113 | ||
114 | va_start(args, fmt); | |
115 | printk(KERN_CRIT "NILFS error (device %s): %s: ", sb->s_id, function); | |
116 | vprintk(fmt, args); | |
117 | printk("\n"); | |
118 | va_end(args); | |
119 | ||
120 | if (!(sb->s_flags & MS_RDONLY)) { | |
c8a11c8a | 121 | nilfs_set_error(sbi); |
783f6184 RK |
122 | |
123 | if (nilfs_test_opt(sbi, ERRORS_RO)) { | |
124 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
125 | sb->s_flags |= MS_RDONLY; | |
126 | } | |
127 | } | |
128 | ||
129 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) | |
130 | panic("NILFS (device %s): panic forced after error\n", | |
131 | sb->s_id); | |
132 | } | |
133 | ||
134 | void nilfs_warning(struct super_block *sb, const char *function, | |
135 | const char *fmt, ...) | |
136 | { | |
137 | va_list args; | |
138 | ||
139 | va_start(args, fmt); | |
140 | printk(KERN_WARNING "NILFS warning (device %s): %s: ", | |
141 | sb->s_id, function); | |
142 | vprintk(fmt, args); | |
143 | printk("\n"); | |
144 | va_end(args); | |
145 | } | |
146 | ||
783f6184 | 147 | |
a53b4751 | 148 | struct inode *nilfs_alloc_inode_common(struct the_nilfs *nilfs) |
783f6184 RK |
149 | { |
150 | struct nilfs_inode_info *ii; | |
151 | ||
152 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); | |
153 | if (!ii) | |
154 | return NULL; | |
155 | ii->i_bh = NULL; | |
156 | ii->i_state = 0; | |
157 | ii->vfs_inode.i_version = 1; | |
a53b4751 | 158 | nilfs_btnode_cache_init(&ii->i_btnode_cache, nilfs->ns_bdi); |
783f6184 RK |
159 | return &ii->vfs_inode; |
160 | } | |
161 | ||
a53b4751 RK |
162 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
163 | { | |
164 | return nilfs_alloc_inode_common(NILFS_SB(sb)->s_nilfs); | |
165 | } | |
166 | ||
783f6184 RK |
167 | void nilfs_destroy_inode(struct inode *inode) |
168 | { | |
169 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); | |
170 | } | |
171 | ||
783f6184 RK |
172 | static void nilfs_clear_inode(struct inode *inode) |
173 | { | |
174 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
783f6184 | 175 | |
783f6184 RK |
176 | /* |
177 | * Free resources allocated in nilfs_read_inode(), here. | |
178 | */ | |
a2e7d2df | 179 | BUG_ON(!list_empty(&ii->i_dirty)); |
783f6184 RK |
180 | brelse(ii->i_bh); |
181 | ii->i_bh = NULL; | |
783f6184 RK |
182 | |
183 | if (test_bit(NILFS_I_BMAP, &ii->i_state)) | |
184 | nilfs_bmap_clear(ii->i_bmap); | |
185 | ||
186 | nilfs_btnode_cache_clear(&ii->i_btnode_cache); | |
783f6184 RK |
187 | } |
188 | ||
b2ac86e1 | 189 | static int nilfs_sync_super(struct nilfs_sb_info *sbi, int flag) |
783f6184 RK |
190 | { |
191 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
192 | int err; | |
193 | int barrier_done = 0; | |
194 | ||
195 | if (nilfs_test_opt(sbi, BARRIER)) { | |
e339ad31 | 196 | set_buffer_ordered(nilfs->ns_sbh[0]); |
783f6184 RK |
197 | barrier_done = 1; |
198 | } | |
199 | retry: | |
e339ad31 RK |
200 | set_buffer_dirty(nilfs->ns_sbh[0]); |
201 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); | |
783f6184 RK |
202 | if (err == -EOPNOTSUPP && barrier_done) { |
203 | nilfs_warning(sbi->s_super, __func__, | |
204 | "barrier-based sync failed. " | |
205 | "disabling barriers\n"); | |
206 | nilfs_clear_opt(sbi, BARRIER); | |
207 | barrier_done = 0; | |
e339ad31 | 208 | clear_buffer_ordered(nilfs->ns_sbh[0]); |
783f6184 RK |
209 | goto retry; |
210 | } | |
e339ad31 | 211 | if (unlikely(err)) { |
783f6184 RK |
212 | printk(KERN_ERR |
213 | "NILFS: unable to write superblock (err=%d)\n", err); | |
e339ad31 | 214 | if (err == -EIO && nilfs->ns_sbh[1]) { |
b2ac86e1 JS |
215 | /* |
216 | * sbp[0] points to newer log than sbp[1], | |
217 | * so copy sbp[0] to sbp[1] to take over sbp[0]. | |
218 | */ | |
219 | memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0], | |
220 | nilfs->ns_sbsize); | |
e339ad31 RK |
221 | nilfs_fall_back_super_block(nilfs); |
222 | goto retry; | |
223 | } | |
224 | } else { | |
225 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; | |
226 | ||
b2ac86e1 JS |
227 | nilfs->ns_sbwcount++; |
228 | ||
e339ad31 RK |
229 | /* |
230 | * The latest segment becomes trailable from the position | |
231 | * written in superblock. | |
232 | */ | |
783f6184 | 233 | clear_nilfs_discontinued(nilfs); |
e339ad31 RK |
234 | |
235 | /* update GC protection for recent segments */ | |
236 | if (nilfs->ns_sbh[1]) { | |
b2ac86e1 | 237 | if (flag == NILFS_SB_COMMIT_ALL) { |
e339ad31 | 238 | set_buffer_dirty(nilfs->ns_sbh[1]); |
b2ac86e1 JS |
239 | if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0) |
240 | goto out; | |
e339ad31 | 241 | } |
b2ac86e1 JS |
242 | if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) < |
243 | le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno)) | |
244 | sbp = nilfs->ns_sbp[1]; | |
e339ad31 | 245 | } |
783f6184 | 246 | |
b2ac86e1 JS |
247 | spin_lock(&nilfs->ns_last_segment_lock); |
248 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); | |
249 | spin_unlock(&nilfs->ns_last_segment_lock); | |
250 | } | |
251 | out: | |
783f6184 RK |
252 | return err; |
253 | } | |
254 | ||
60f46b7e RK |
255 | void nilfs_set_log_cursor(struct nilfs_super_block *sbp, |
256 | struct the_nilfs *nilfs) | |
257 | { | |
258 | sector_t nfreeblocks; | |
259 | ||
260 | /* nilfs->ns_sem must be locked by the caller. */ | |
261 | nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
262 | sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
263 | ||
264 | spin_lock(&nilfs->ns_last_segment_lock); | |
265 | sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
266 | sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
267 | sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
268 | spin_unlock(&nilfs->ns_last_segment_lock); | |
269 | } | |
270 | ||
b2ac86e1 JS |
271 | struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *sbi, |
272 | int flip) | |
783f6184 RK |
273 | { |
274 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
e339ad31 | 275 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 276 | |
d26493b6 | 277 | /* nilfs->ns_sem must be locked by the caller. */ |
34cb9b5c | 278 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
d26493b6 JS |
279 | if (sbp[1] && |
280 | sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
b2ac86e1 | 281 | memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); |
d26493b6 | 282 | } else { |
e339ad31 RK |
283 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", |
284 | sbi->s_super->s_id); | |
d26493b6 | 285 | return NULL; |
e339ad31 | 286 | } |
b2ac86e1 JS |
287 | } else if (sbp[1] && |
288 | sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
289 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
e339ad31 | 290 | } |
b2ac86e1 JS |
291 | |
292 | if (flip && sbp[1]) | |
293 | nilfs_swap_super_block(nilfs); | |
294 | ||
d26493b6 JS |
295 | return sbp; |
296 | } | |
297 | ||
b2ac86e1 | 298 | int nilfs_commit_super(struct nilfs_sb_info *sbi, int flag) |
d26493b6 JS |
299 | { |
300 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
301 | struct nilfs_super_block **sbp = nilfs->ns_sbp; | |
302 | time_t t; | |
303 | ||
304 | /* nilfs->ns_sem must be locked by the caller. */ | |
e339ad31 | 305 | t = get_seconds(); |
b2ac86e1 | 306 | nilfs->ns_sbwtime = t; |
e339ad31 RK |
307 | sbp[0]->s_wtime = cpu_to_le64(t); |
308 | sbp[0]->s_sum = 0; | |
309 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
310 | (unsigned char *)sbp[0], | |
311 | nilfs->ns_sbsize)); | |
b2ac86e1 JS |
312 | if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) { |
313 | sbp[1]->s_wtime = sbp[0]->s_wtime; | |
314 | sbp[1]->s_sum = 0; | |
315 | sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
316 | (unsigned char *)sbp[1], | |
317 | nilfs->ns_sbsize)); | |
e339ad31 | 318 | } |
e605f0a7 | 319 | clear_nilfs_sb_dirty(nilfs); |
b2ac86e1 | 320 | return nilfs_sync_super(sbi, flag); |
783f6184 RK |
321 | } |
322 | ||
7ecaa46c RK |
323 | /** |
324 | * nilfs_cleanup_super() - write filesystem state for cleanup | |
325 | * @sbi: nilfs_sb_info to be unmounted or degraded to read-only | |
326 | * | |
327 | * This function restores state flags in the on-disk super block. | |
328 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the | |
329 | * filesystem was not clean previously. | |
330 | */ | |
331 | int nilfs_cleanup_super(struct nilfs_sb_info *sbi) | |
332 | { | |
d26493b6 | 333 | struct nilfs_super_block **sbp; |
b2ac86e1 | 334 | int flag = NILFS_SB_COMMIT; |
d26493b6 | 335 | int ret = -EIO; |
7ecaa46c | 336 | |
b2ac86e1 | 337 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
338 | if (sbp) { |
339 | sbp[0]->s_state = cpu_to_le16(sbi->s_nilfs->ns_mount_state); | |
b2ac86e1 JS |
340 | nilfs_set_log_cursor(sbp[0], sbi->s_nilfs); |
341 | if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { | |
342 | /* | |
343 | * make the "clean" flag also to the opposite | |
344 | * super block if both super blocks point to | |
345 | * the same checkpoint. | |
346 | */ | |
347 | sbp[1]->s_state = sbp[0]->s_state; | |
348 | flag = NILFS_SB_COMMIT_ALL; | |
349 | } | |
350 | ret = nilfs_commit_super(sbi, flag); | |
d26493b6 | 351 | } |
7ecaa46c RK |
352 | return ret; |
353 | } | |
354 | ||
783f6184 RK |
355 | static void nilfs_put_super(struct super_block *sb) |
356 | { | |
357 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
358 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
359 | ||
6cfd0148 CH |
360 | lock_kernel(); |
361 | ||
783f6184 RK |
362 | nilfs_detach_segment_constructor(sbi); |
363 | ||
364 | if (!(sb->s_flags & MS_RDONLY)) { | |
365 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 366 | nilfs_cleanup_super(sbi); |
783f6184 RK |
367 | up_write(&nilfs->ns_sem); |
368 | } | |
e59399d0 | 369 | down_write(&nilfs->ns_super_sem); |
3f82ff55 RK |
370 | if (nilfs->ns_current == sbi) |
371 | nilfs->ns_current = NULL; | |
e59399d0 | 372 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
373 | |
374 | nilfs_detach_checkpoint(sbi); | |
375 | put_nilfs(sbi->s_nilfs); | |
376 | sbi->s_super = NULL; | |
377 | sb->s_fs_info = NULL; | |
6dd47406 | 378 | nilfs_put_sbinfo(sbi); |
6cfd0148 CH |
379 | |
380 | unlock_kernel(); | |
783f6184 RK |
381 | } |
382 | ||
783f6184 RK |
383 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
384 | { | |
6233caa9 JS |
385 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
386 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 | 387 | struct nilfs_super_block **sbp; |
783f6184 RK |
388 | int err = 0; |
389 | ||
390 | /* This function is called when super block should be written back */ | |
391 | if (wait) | |
392 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
393 | |
394 | down_write(&nilfs->ns_sem); | |
d26493b6 | 395 | if (nilfs_sb_dirty(nilfs)) { |
b2ac86e1 JS |
396 | sbp = nilfs_prepare_super(sbi, nilfs_sb_will_flip(nilfs)); |
397 | if (likely(sbp)) { | |
398 | nilfs_set_log_cursor(sbp[0], nilfs); | |
399 | nilfs_commit_super(sbi, NILFS_SB_COMMIT); | |
400 | } | |
d26493b6 | 401 | } |
6233caa9 JS |
402 | up_write(&nilfs->ns_sem); |
403 | ||
783f6184 RK |
404 | return err; |
405 | } | |
406 | ||
407 | int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno) | |
408 | { | |
409 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
410 | struct nilfs_checkpoint *raw_cp; | |
411 | struct buffer_head *bh_cp; | |
412 | int err; | |
413 | ||
e59399d0 | 414 | down_write(&nilfs->ns_super_sem); |
783f6184 | 415 | list_add(&sbi->s_list, &nilfs->ns_supers); |
e59399d0 | 416 | up_write(&nilfs->ns_super_sem); |
783f6184 | 417 | |
79739565 | 418 | sbi->s_ifile = nilfs_ifile_new(sbi, nilfs->ns_inode_size); |
783f6184 RK |
419 | if (!sbi->s_ifile) |
420 | return -ENOMEM; | |
421 | ||
1154ecbd | 422 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
423 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
424 | &bh_cp); | |
1154ecbd | 425 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
426 | if (unlikely(err)) { |
427 | if (err == -ENOENT || err == -EINVAL) { | |
428 | printk(KERN_ERR | |
429 | "NILFS: Invalid checkpoint " | |
430 | "(checkpoint number=%llu)\n", | |
431 | (unsigned long long)cno); | |
432 | err = -EINVAL; | |
433 | } | |
434 | goto failed; | |
435 | } | |
436 | err = nilfs_read_inode_common(sbi->s_ifile, &raw_cp->cp_ifile_inode); | |
437 | if (unlikely(err)) | |
438 | goto failed_bh; | |
439 | atomic_set(&sbi->s_inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); | |
440 | atomic_set(&sbi->s_blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); | |
441 | ||
442 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
443 | return 0; | |
444 | ||
445 | failed_bh: | |
446 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
447 | failed: | |
448 | nilfs_mdt_destroy(sbi->s_ifile); | |
449 | sbi->s_ifile = NULL; | |
450 | ||
e59399d0 | 451 | down_write(&nilfs->ns_super_sem); |
783f6184 | 452 | list_del_init(&sbi->s_list); |
e59399d0 | 453 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
454 | |
455 | return err; | |
456 | } | |
457 | ||
458 | void nilfs_detach_checkpoint(struct nilfs_sb_info *sbi) | |
459 | { | |
460 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
461 | ||
783f6184 RK |
462 | nilfs_mdt_destroy(sbi->s_ifile); |
463 | sbi->s_ifile = NULL; | |
e59399d0 | 464 | down_write(&nilfs->ns_super_sem); |
783f6184 | 465 | list_del_init(&sbi->s_list); |
e59399d0 | 466 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
467 | } |
468 | ||
783f6184 RK |
469 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
470 | { | |
471 | struct super_block *sb = dentry->d_sb; | |
472 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
c306af23 RK |
473 | struct the_nilfs *nilfs = sbi->s_nilfs; |
474 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
783f6184 RK |
475 | unsigned long long blocks; |
476 | unsigned long overhead; | |
477 | unsigned long nrsvblocks; | |
478 | sector_t nfreeblocks; | |
783f6184 RK |
479 | int err; |
480 | ||
481 | /* | |
482 | * Compute all of the segment blocks | |
483 | * | |
484 | * The blocks before first segment and after last segment | |
485 | * are excluded. | |
486 | */ | |
487 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
488 | - nilfs->ns_first_data_block; | |
489 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
490 | ||
491 | /* | |
492 | * Compute the overhead | |
493 | * | |
7a65004b | 494 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
495 | * We must count them as the overhead. |
496 | */ | |
497 | overhead = 0; | |
498 | ||
499 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
500 | if (unlikely(err)) | |
501 | return err; | |
502 | ||
503 | buf->f_type = NILFS_SUPER_MAGIC; | |
504 | buf->f_bsize = sb->s_blocksize; | |
505 | buf->f_blocks = blocks - overhead; | |
506 | buf->f_bfree = nfreeblocks; | |
507 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
508 | (buf->f_bfree - nrsvblocks) : 0; | |
509 | buf->f_files = atomic_read(&sbi->s_inodes_count); | |
510 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ | |
511 | buf->f_namelen = NILFS_NAME_LEN; | |
c306af23 RK |
512 | buf->f_fsid.val[0] = (u32)id; |
513 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
514 | ||
783f6184 RK |
515 | return 0; |
516 | } | |
517 | ||
b58a285b JS |
518 | static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
519 | { | |
520 | struct super_block *sb = vfs->mnt_sb; | |
521 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
522 | ||
523 | if (!nilfs_test_opt(sbi, BARRIER)) | |
91f1953b | 524 | seq_printf(seq, ",nobarrier"); |
b58a285b JS |
525 | if (nilfs_test_opt(sbi, SNAPSHOT)) |
526 | seq_printf(seq, ",cp=%llu", | |
527 | (unsigned long long int)sbi->s_snapshot_cno); | |
b58a285b JS |
528 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) |
529 | seq_printf(seq, ",errors=panic"); | |
277a6a34 RK |
530 | if (nilfs_test_opt(sbi, ERRORS_CONT)) |
531 | seq_printf(seq, ",errors=continue"); | |
b58a285b JS |
532 | if (nilfs_test_opt(sbi, STRICT_ORDER)) |
533 | seq_printf(seq, ",order=strict"); | |
0234576d RK |
534 | if (nilfs_test_opt(sbi, NORECOVERY)) |
535 | seq_printf(seq, ",norecovery"); | |
e902ec99 JS |
536 | if (nilfs_test_opt(sbi, DISCARD)) |
537 | seq_printf(seq, ",discard"); | |
b58a285b JS |
538 | |
539 | return 0; | |
540 | } | |
541 | ||
b87221de | 542 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
543 | .alloc_inode = nilfs_alloc_inode, |
544 | .destroy_inode = nilfs_destroy_inode, | |
545 | .dirty_inode = nilfs_dirty_inode, | |
546 | /* .write_inode = nilfs_write_inode, */ | |
547 | /* .put_inode = nilfs_put_inode, */ | |
548 | /* .drop_inode = nilfs_drop_inode, */ | |
549 | .delete_inode = nilfs_delete_inode, | |
550 | .put_super = nilfs_put_super, | |
1dfa2710 | 551 | /* .write_super = nilfs_write_super, */ |
783f6184 RK |
552 | .sync_fs = nilfs_sync_fs, |
553 | /* .write_super_lockfs */ | |
554 | /* .unlockfs */ | |
555 | .statfs = nilfs_statfs, | |
556 | .remount_fs = nilfs_remount, | |
557 | .clear_inode = nilfs_clear_inode, | |
558 | /* .umount_begin */ | |
b58a285b | 559 | .show_options = nilfs_show_options |
783f6184 RK |
560 | }; |
561 | ||
562 | static struct inode * | |
563 | nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation) | |
564 | { | |
565 | struct inode *inode; | |
566 | ||
567 | if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO && | |
568 | ino != NILFS_SKETCH_INO) | |
569 | return ERR_PTR(-ESTALE); | |
570 | ||
571 | inode = nilfs_iget(sb, ino); | |
572 | if (IS_ERR(inode)) | |
573 | return ERR_CAST(inode); | |
574 | if (generation && inode->i_generation != generation) { | |
575 | iput(inode); | |
576 | return ERR_PTR(-ESTALE); | |
577 | } | |
578 | ||
579 | return inode; | |
580 | } | |
581 | ||
582 | static struct dentry * | |
583 | nilfs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, | |
584 | int fh_type) | |
585 | { | |
586 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
587 | nilfs_nfs_get_inode); | |
588 | } | |
589 | ||
590 | static struct dentry * | |
591 | nilfs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, | |
592 | int fh_type) | |
593 | { | |
594 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
595 | nilfs_nfs_get_inode); | |
596 | } | |
597 | ||
ac4cfdd6 | 598 | static const struct export_operations nilfs_export_ops = { |
783f6184 RK |
599 | .fh_to_dentry = nilfs_fh_to_dentry, |
600 | .fh_to_parent = nilfs_fh_to_parent, | |
601 | .get_parent = nilfs_get_parent, | |
602 | }; | |
603 | ||
604 | enum { | |
605 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
0234576d | 606 | Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
e902ec99 | 607 | Opt_discard, Opt_err, |
783f6184 RK |
608 | }; |
609 | ||
610 | static match_table_t tokens = { | |
611 | {Opt_err_cont, "errors=continue"}, | |
612 | {Opt_err_panic, "errors=panic"}, | |
613 | {Opt_err_ro, "errors=remount-ro"}, | |
91f1953b | 614 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
615 | {Opt_snapshot, "cp=%u"}, |
616 | {Opt_order, "order=%s"}, | |
0234576d | 617 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 618 | {Opt_discard, "discard"}, |
783f6184 RK |
619 | {Opt_err, NULL} |
620 | }; | |
621 | ||
783f6184 RK |
622 | static int parse_options(char *options, struct super_block *sb) |
623 | { | |
624 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
625 | char *p; | |
626 | substring_t args[MAX_OPT_ARGS]; | |
627 | int option; | |
628 | ||
629 | if (!options) | |
630 | return 1; | |
631 | ||
632 | while ((p = strsep(&options, ",")) != NULL) { | |
633 | int token; | |
634 | if (!*p) | |
635 | continue; | |
636 | ||
637 | token = match_token(p, tokens, args); | |
638 | switch (token) { | |
91f1953b JS |
639 | case Opt_nobarrier: |
640 | nilfs_clear_opt(sbi, BARRIER); | |
783f6184 RK |
641 | break; |
642 | case Opt_order: | |
643 | if (strcmp(args[0].from, "relaxed") == 0) | |
644 | /* Ordered data semantics */ | |
645 | nilfs_clear_opt(sbi, STRICT_ORDER); | |
646 | else if (strcmp(args[0].from, "strict") == 0) | |
647 | /* Strict in-order semantics */ | |
648 | nilfs_set_opt(sbi, STRICT_ORDER); | |
649 | else | |
650 | return 0; | |
651 | break; | |
652 | case Opt_err_panic: | |
653 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC); | |
654 | break; | |
655 | case Opt_err_ro: | |
656 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO); | |
657 | break; | |
658 | case Opt_err_cont: | |
659 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT); | |
660 | break; | |
661 | case Opt_snapshot: | |
662 | if (match_int(&args[0], &option) || option <= 0) | |
663 | return 0; | |
664 | if (!(sb->s_flags & MS_RDONLY)) | |
665 | return 0; | |
666 | sbi->s_snapshot_cno = option; | |
667 | nilfs_set_opt(sbi, SNAPSHOT); | |
668 | break; | |
0234576d RK |
669 | case Opt_norecovery: |
670 | nilfs_set_opt(sbi, NORECOVERY); | |
671 | break; | |
e902ec99 JS |
672 | case Opt_discard: |
673 | nilfs_set_opt(sbi, DISCARD); | |
674 | break; | |
783f6184 RK |
675 | default: |
676 | printk(KERN_ERR | |
677 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
678 | return 0; | |
679 | } | |
680 | } | |
681 | return 1; | |
682 | } | |
683 | ||
684 | static inline void | |
685 | nilfs_set_default_options(struct nilfs_sb_info *sbi, | |
686 | struct nilfs_super_block *sbp) | |
687 | { | |
688 | sbi->s_mount_opt = | |
277a6a34 | 689 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
690 | } |
691 | ||
692 | static int nilfs_setup_super(struct nilfs_sb_info *sbi) | |
693 | { | |
694 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 JS |
695 | struct nilfs_super_block **sbp; |
696 | int max_mnt_count; | |
697 | int mnt_count; | |
698 | ||
699 | /* nilfs->ns_sem must be locked by the caller. */ | |
b2ac86e1 | 700 | sbp = nilfs_prepare_super(sbi, 0); |
d26493b6 JS |
701 | if (!sbp) |
702 | return -EIO; | |
703 | ||
704 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); | |
705 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); | |
783f6184 | 706 | |
f50a4c81 | 707 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
783f6184 RK |
708 | printk(KERN_WARNING |
709 | "NILFS warning: mounting fs with errors\n"); | |
710 | #if 0 | |
711 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
712 | printk(KERN_WARNING | |
713 | "NILFS warning: maximal mount count reached\n"); | |
714 | #endif | |
715 | } | |
716 | if (!max_mnt_count) | |
d26493b6 | 717 | sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
783f6184 | 718 | |
d26493b6 JS |
719 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
720 | sbp[0]->s_state = | |
721 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); | |
722 | sbp[0]->s_mtime = cpu_to_le64(get_seconds()); | |
b2ac86e1 JS |
723 | /* synchronize sbp[1] with sbp[0] */ |
724 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
725 | return nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL); | |
783f6184 RK |
726 | } |
727 | ||
e339ad31 RK |
728 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
729 | u64 pos, int blocksize, | |
730 | struct buffer_head **pbh) | |
783f6184 | 731 | { |
e339ad31 RK |
732 | unsigned long long sb_index = pos; |
733 | unsigned long offset; | |
783f6184 | 734 | |
e339ad31 | 735 | offset = do_div(sb_index, blocksize); |
783f6184 | 736 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 737 | if (!*pbh) |
783f6184 | 738 | return NULL; |
783f6184 RK |
739 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
740 | } | |
741 | ||
783f6184 RK |
742 | int nilfs_store_magic_and_option(struct super_block *sb, |
743 | struct nilfs_super_block *sbp, | |
744 | char *data) | |
745 | { | |
746 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
747 | ||
783f6184 RK |
748 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
749 | ||
750 | /* FS independent flags */ | |
751 | #ifdef NILFS_ATIME_DISABLE | |
752 | sb->s_flags |= MS_NOATIME; | |
753 | #endif | |
754 | ||
783f6184 RK |
755 | nilfs_set_default_options(sbi, sbp); |
756 | ||
757 | sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid); | |
758 | sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid); | |
759 | sbi->s_interval = le32_to_cpu(sbp->s_c_interval); | |
760 | sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max); | |
761 | ||
e339ad31 | 762 | return !parse_options(data, sb) ? -EINVAL : 0 ; |
783f6184 RK |
763 | } |
764 | ||
765 | /** | |
766 | * nilfs_fill_super() - initialize a super block instance | |
767 | * @sb: super_block | |
768 | * @data: mount options | |
769 | * @silent: silent mode flag | |
770 | * @nilfs: the_nilfs struct | |
771 | * | |
aa7dfb89 | 772 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
773 | * So, the recovery process is protected from other simultaneous mounts. |
774 | */ | |
775 | static int | |
776 | nilfs_fill_super(struct super_block *sb, void *data, int silent, | |
777 | struct the_nilfs *nilfs) | |
778 | { | |
779 | struct nilfs_sb_info *sbi; | |
780 | struct inode *root; | |
781 | __u64 cno; | |
782 | int err; | |
783 | ||
784 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
785 | if (!sbi) | |
786 | return -ENOMEM; | |
787 | ||
788 | sb->s_fs_info = sbi; | |
789 | ||
790 | get_nilfs(nilfs); | |
791 | sbi->s_nilfs = nilfs; | |
792 | sbi->s_super = sb; | |
6dd47406 | 793 | atomic_set(&sbi->s_count, 1); |
783f6184 RK |
794 | |
795 | err = init_nilfs(nilfs, sbi, (char *)data); | |
796 | if (err) | |
797 | goto failed_sbi; | |
798 | ||
799 | spin_lock_init(&sbi->s_inode_lock); | |
800 | INIT_LIST_HEAD(&sbi->s_dirty_files); | |
801 | INIT_LIST_HEAD(&sbi->s_list); | |
802 | ||
803 | /* | |
804 | * Following initialization is overlapped because | |
805 | * nilfs_sb_info structure has been cleared at the beginning. | |
806 | * But we reserve them to keep our interest and make ready | |
807 | * for the future change. | |
808 | */ | |
809 | get_random_bytes(&sbi->s_next_generation, | |
810 | sizeof(sbi->s_next_generation)); | |
811 | spin_lock_init(&sbi->s_next_gen_lock); | |
812 | ||
813 | sb->s_op = &nilfs_sops; | |
814 | sb->s_export_op = &nilfs_export_ops; | |
815 | sb->s_root = NULL; | |
61239230 | 816 | sb->s_time_gran = 1; |
973bec34 | 817 | sb->s_bdi = nilfs->ns_bdi; |
783f6184 | 818 | |
f50a4c81 RK |
819 | err = load_nilfs(nilfs, sbi); |
820 | if (err) | |
821 | goto failed_sbi; | |
822 | ||
783f6184 RK |
823 | cno = nilfs_last_cno(nilfs); |
824 | ||
825 | if (sb->s_flags & MS_RDONLY) { | |
826 | if (nilfs_test_opt(sbi, SNAPSHOT)) { | |
43be0ec0 | 827 | down_read(&nilfs->ns_segctor_sem); |
1f5abe7e RK |
828 | err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, |
829 | sbi->s_snapshot_cno); | |
43be0ec0 ZY |
830 | up_read(&nilfs->ns_segctor_sem); |
831 | if (err < 0) { | |
832 | if (err == -ENOENT) | |
833 | err = -EINVAL; | |
1f5abe7e | 834 | goto failed_sbi; |
43be0ec0 | 835 | } |
1f5abe7e | 836 | if (!err) { |
783f6184 RK |
837 | printk(KERN_ERR |
838 | "NILFS: The specified checkpoint is " | |
839 | "not a snapshot " | |
840 | "(checkpoint number=%llu).\n", | |
841 | (unsigned long long)sbi->s_snapshot_cno); | |
842 | err = -EINVAL; | |
843 | goto failed_sbi; | |
844 | } | |
845 | cno = sbi->s_snapshot_cno; | |
d240e067 | 846 | } |
783f6184 RK |
847 | } |
848 | ||
849 | err = nilfs_attach_checkpoint(sbi, cno); | |
850 | if (err) { | |
851 | printk(KERN_ERR "NILFS: error loading a checkpoint" | |
852 | " (checkpoint number=%llu).\n", (unsigned long long)cno); | |
853 | goto failed_sbi; | |
854 | } | |
855 | ||
856 | if (!(sb->s_flags & MS_RDONLY)) { | |
cece5520 | 857 | err = nilfs_attach_segment_constructor(sbi); |
783f6184 RK |
858 | if (err) |
859 | goto failed_checkpoint; | |
860 | } | |
861 | ||
862 | root = nilfs_iget(sb, NILFS_ROOT_INO); | |
863 | if (IS_ERR(root)) { | |
864 | printk(KERN_ERR "NILFS: get root inode failed\n"); | |
865 | err = PTR_ERR(root); | |
866 | goto failed_segctor; | |
867 | } | |
868 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
869 | iput(root); | |
870 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); | |
871 | err = -EINVAL; | |
872 | goto failed_segctor; | |
873 | } | |
874 | sb->s_root = d_alloc_root(root); | |
875 | if (!sb->s_root) { | |
876 | iput(root); | |
877 | printk(KERN_ERR "NILFS: get root dentry failed\n"); | |
878 | err = -ENOMEM; | |
879 | goto failed_segctor; | |
880 | } | |
881 | ||
882 | if (!(sb->s_flags & MS_RDONLY)) { | |
883 | down_write(&nilfs->ns_sem); | |
884 | nilfs_setup_super(sbi); | |
885 | up_write(&nilfs->ns_sem); | |
886 | } | |
887 | ||
e59399d0 | 888 | down_write(&nilfs->ns_super_sem); |
3f82ff55 RK |
889 | if (!nilfs_test_opt(sbi, SNAPSHOT)) |
890 | nilfs->ns_current = sbi; | |
e59399d0 | 891 | up_write(&nilfs->ns_super_sem); |
3f82ff55 | 892 | |
783f6184 RK |
893 | return 0; |
894 | ||
783f6184 RK |
895 | failed_segctor: |
896 | nilfs_detach_segment_constructor(sbi); | |
897 | ||
898 | failed_checkpoint: | |
899 | nilfs_detach_checkpoint(sbi); | |
900 | ||
901 | failed_sbi: | |
902 | put_nilfs(nilfs); | |
903 | sb->s_fs_info = NULL; | |
6dd47406 | 904 | nilfs_put_sbinfo(sbi); |
783f6184 RK |
905 | return err; |
906 | } | |
907 | ||
908 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
909 | { | |
910 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
783f6184 RK |
911 | struct the_nilfs *nilfs = sbi->s_nilfs; |
912 | unsigned long old_sb_flags; | |
913 | struct nilfs_mount_options old_opts; | |
d240e067 | 914 | int was_snapshot, err; |
783f6184 | 915 | |
337eb00a AIB |
916 | lock_kernel(); |
917 | ||
e59399d0 | 918 | down_write(&nilfs->ns_super_sem); |
783f6184 RK |
919 | old_sb_flags = sb->s_flags; |
920 | old_opts.mount_opt = sbi->s_mount_opt; | |
921 | old_opts.snapshot_cno = sbi->s_snapshot_cno; | |
d240e067 | 922 | was_snapshot = nilfs_test_opt(sbi, SNAPSHOT); |
783f6184 RK |
923 | |
924 | if (!parse_options(data, sb)) { | |
925 | err = -EINVAL; | |
926 | goto restore_opts; | |
927 | } | |
928 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); | |
929 | ||
d240e067 RK |
930 | err = -EINVAL; |
931 | if (was_snapshot) { | |
932 | if (!(*flags & MS_RDONLY)) { | |
933 | printk(KERN_ERR "NILFS (device %s): cannot remount " | |
934 | "snapshot read/write.\n", | |
935 | sb->s_id); | |
936 | goto restore_opts; | |
937 | } else if (sbi->s_snapshot_cno != old_opts.snapshot_cno) { | |
938 | printk(KERN_ERR "NILFS (device %s): cannot " | |
939 | "remount to a different snapshot.\n", | |
940 | sb->s_id); | |
941 | goto restore_opts; | |
942 | } | |
943 | } else { | |
944 | if (nilfs_test_opt(sbi, SNAPSHOT)) { | |
945 | printk(KERN_ERR "NILFS (device %s): cannot change " | |
946 | "a regular mount to a snapshot.\n", | |
947 | sb->s_id); | |
948 | goto restore_opts; | |
949 | } | |
783f6184 RK |
950 | } |
951 | ||
0234576d RK |
952 | if (!nilfs_valid_fs(nilfs)) { |
953 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
954 | "remount because the filesystem is in an " | |
955 | "incomplete recovery state.\n", sb->s_id); | |
0234576d RK |
956 | goto restore_opts; |
957 | } | |
958 | ||
783f6184 RK |
959 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
960 | goto out; | |
961 | if (*flags & MS_RDONLY) { | |
962 | /* Shutting down the segment constructor */ | |
963 | nilfs_detach_segment_constructor(sbi); | |
964 | sb->s_flags |= MS_RDONLY; | |
965 | ||
783f6184 RK |
966 | /* |
967 | * Remounting a valid RW partition RDONLY, so set | |
968 | * the RDONLY flag and then mark the partition as valid again. | |
969 | */ | |
970 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 971 | nilfs_cleanup_super(sbi); |
783f6184 RK |
972 | up_write(&nilfs->ns_sem); |
973 | } else { | |
974 | /* | |
975 | * Mounting a RDONLY partition read-write, so reread and | |
976 | * store the current valid flag. (It may have been changed | |
977 | * by fsck since we originally mounted the partition.) | |
978 | */ | |
783f6184 | 979 | sb->s_flags &= ~MS_RDONLY; |
783f6184 | 980 | |
cece5520 | 981 | err = nilfs_attach_segment_constructor(sbi); |
783f6184 | 982 | if (err) |
e59399d0 | 983 | goto restore_opts; |
783f6184 RK |
984 | |
985 | down_write(&nilfs->ns_sem); | |
986 | nilfs_setup_super(sbi); | |
987 | up_write(&nilfs->ns_sem); | |
783f6184 RK |
988 | } |
989 | out: | |
e59399d0 | 990 | up_write(&nilfs->ns_super_sem); |
337eb00a | 991 | unlock_kernel(); |
783f6184 RK |
992 | return 0; |
993 | ||
783f6184 RK |
994 | restore_opts: |
995 | sb->s_flags = old_sb_flags; | |
996 | sbi->s_mount_opt = old_opts.mount_opt; | |
997 | sbi->s_snapshot_cno = old_opts.snapshot_cno; | |
e59399d0 | 998 | up_write(&nilfs->ns_super_sem); |
337eb00a | 999 | unlock_kernel(); |
783f6184 RK |
1000 | return err; |
1001 | } | |
1002 | ||
1003 | struct nilfs_super_data { | |
1004 | struct block_device *bdev; | |
6dd47406 | 1005 | struct nilfs_sb_info *sbi; |
783f6184 RK |
1006 | __u64 cno; |
1007 | int flags; | |
1008 | }; | |
1009 | ||
1010 | /** | |
1011 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
1012 | * @data: mount options | |
1013 | * @sd: nilfs_super_data | |
1014 | */ | |
1015 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
1016 | { | |
1017 | char *p, *options = data; | |
1018 | substring_t args[MAX_OPT_ARGS]; | |
1019 | int option, token; | |
1020 | int ret = 0; | |
1021 | ||
1022 | do { | |
1023 | p = strsep(&options, ","); | |
1024 | if (p != NULL && *p) { | |
1025 | token = match_token(p, tokens, args); | |
1026 | if (token == Opt_snapshot) { | |
1027 | if (!(sd->flags & MS_RDONLY)) | |
1028 | ret++; | |
1029 | else { | |
1030 | ret = match_int(&args[0], &option); | |
1031 | if (!ret) { | |
1032 | if (option > 0) | |
1033 | sd->cno = option; | |
1034 | else | |
1035 | ret++; | |
1036 | } | |
1037 | } | |
1038 | } | |
1039 | if (ret) | |
1040 | printk(KERN_ERR | |
1041 | "NILFS: invalid mount option: %s\n", p); | |
1042 | } | |
1043 | if (!options) | |
1044 | break; | |
1045 | BUG_ON(options == data); | |
1046 | *(options - 1) = ','; | |
1047 | } while (!ret); | |
1048 | return ret; | |
1049 | } | |
1050 | ||
1051 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1052 | { | |
1053 | struct nilfs_super_data *sd = data; | |
1054 | ||
1055 | s->s_bdev = sd->bdev; | |
1056 | s->s_dev = s->s_bdev->bd_dev; | |
1057 | return 0; | |
1058 | } | |
1059 | ||
1060 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 RK |
1061 | { |
1062 | struct nilfs_super_data *sd = data; | |
6dd47406 RK |
1063 | |
1064 | return sd->sbi && s->s_fs_info == (void *)sd->sbi; | |
783f6184 RK |
1065 | } |
1066 | ||
1067 | static int | |
1068 | nilfs_get_sb(struct file_system_type *fs_type, int flags, | |
1069 | const char *dev_name, void *data, struct vfsmount *mnt) | |
1070 | { | |
1071 | struct nilfs_super_data sd; | |
33c8e57c | 1072 | struct super_block *s; |
13e90559 | 1073 | fmode_t mode = FMODE_READ; |
33c8e57c | 1074 | struct the_nilfs *nilfs; |
783f6184 RK |
1075 | int err, need_to_close = 1; |
1076 | ||
13e90559 RK |
1077 | if (!(flags & MS_RDONLY)) |
1078 | mode |= FMODE_WRITE; | |
1079 | ||
1080 | sd.bdev = open_bdev_exclusive(dev_name, mode, fs_type); | |
783f6184 RK |
1081 | if (IS_ERR(sd.bdev)) |
1082 | return PTR_ERR(sd.bdev); | |
1083 | ||
1084 | /* | |
1085 | * To get mount instance using sget() vfs-routine, NILFS needs | |
1086 | * much more information than normal filesystems to identify mount | |
1087 | * instance. For snapshot mounts, not only a mount type (ro-mount | |
1088 | * or rw-mount) but also a checkpoint number is required. | |
783f6184 RK |
1089 | */ |
1090 | sd.cno = 0; | |
1091 | sd.flags = flags; | |
1092 | if (nilfs_identify((char *)data, &sd)) { | |
1093 | err = -EINVAL; | |
1094 | goto failed; | |
1095 | } | |
1096 | ||
33c8e57c RK |
1097 | nilfs = find_or_create_nilfs(sd.bdev); |
1098 | if (!nilfs) { | |
1099 | err = -ENOMEM; | |
1100 | goto failed; | |
1101 | } | |
1102 | ||
aa7dfb89 | 1103 | mutex_lock(&nilfs->ns_mount_mutex); |
3f82ff55 RK |
1104 | |
1105 | if (!sd.cno) { | |
1106 | /* | |
1107 | * Check if an exclusive mount exists or not. | |
1108 | * Snapshot mounts coexist with a current mount | |
1109 | * (i.e. rw-mount or ro-mount), whereas rw-mount and | |
1110 | * ro-mount are mutually exclusive. | |
1111 | */ | |
e59399d0 | 1112 | down_read(&nilfs->ns_super_sem); |
3f82ff55 RK |
1113 | if (nilfs->ns_current && |
1114 | ((nilfs->ns_current->s_super->s_flags ^ flags) | |
1115 | & MS_RDONLY)) { | |
e59399d0 | 1116 | up_read(&nilfs->ns_super_sem); |
3f82ff55 RK |
1117 | err = -EBUSY; |
1118 | goto failed_unlock; | |
1119 | } | |
e59399d0 | 1120 | up_read(&nilfs->ns_super_sem); |
783f6184 RK |
1121 | } |
1122 | ||
1123 | /* | |
6dd47406 | 1124 | * Find existing nilfs_sb_info struct |
783f6184 | 1125 | */ |
6dd47406 RK |
1126 | sd.sbi = nilfs_find_sbinfo(nilfs, !(flags & MS_RDONLY), sd.cno); |
1127 | ||
6dd47406 RK |
1128 | /* |
1129 | * Get super block instance holding the nilfs_sb_info struct. | |
1130 | * A new instance is allocated if no existing mount is present or | |
1131 | * existing instance has been unmounted. | |
1132 | */ | |
33c8e57c | 1133 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, &sd); |
6dd47406 RK |
1134 | if (sd.sbi) |
1135 | nilfs_put_sbinfo(sd.sbi); | |
1136 | ||
33c8e57c RK |
1137 | if (IS_ERR(s)) { |
1138 | err = PTR_ERR(s); | |
1139 | goto failed_unlock; | |
783f6184 RK |
1140 | } |
1141 | ||
1142 | if (!s->s_root) { | |
1143 | char b[BDEVNAME_SIZE]; | |
1144 | ||
33c8e57c | 1145 | /* New superblock instance created */ |
783f6184 | 1146 | s->s_flags = flags; |
4571b82c | 1147 | s->s_mode = mode; |
783f6184 RK |
1148 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); |
1149 | sb_set_blocksize(s, block_size(sd.bdev)); | |
1150 | ||
e2d1591a RK |
1151 | err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0, |
1152 | nilfs); | |
783f6184 RK |
1153 | if (err) |
1154 | goto cancel_new; | |
1155 | ||
1156 | s->s_flags |= MS_ACTIVE; | |
1157 | need_to_close = 0; | |
783f6184 RK |
1158 | } |
1159 | ||
aa7dfb89 | 1160 | mutex_unlock(&nilfs->ns_mount_mutex); |
783f6184 RK |
1161 | put_nilfs(nilfs); |
1162 | if (need_to_close) | |
13e90559 | 1163 | close_bdev_exclusive(sd.bdev, mode); |
783f6184 RK |
1164 | simple_set_mnt(mnt, s); |
1165 | return 0; | |
1166 | ||
783f6184 | 1167 | failed_unlock: |
aa7dfb89 | 1168 | mutex_unlock(&nilfs->ns_mount_mutex); |
33c8e57c | 1169 | put_nilfs(nilfs); |
783f6184 | 1170 | failed: |
13e90559 | 1171 | close_bdev_exclusive(sd.bdev, mode); |
783f6184 RK |
1172 | |
1173 | return err; | |
1174 | ||
1175 | cancel_new: | |
1176 | /* Abandoning the newly allocated superblock */ | |
aa7dfb89 | 1177 | mutex_unlock(&nilfs->ns_mount_mutex); |
33c8e57c | 1178 | put_nilfs(nilfs); |
a95161aa | 1179 | deactivate_locked_super(s); |
783f6184 | 1180 | /* |
b87ca919 | 1181 | * deactivate_locked_super() invokes close_bdev_exclusive(). |
783f6184 | 1182 | * We must finish all post-cleaning before this call; |
aa7dfb89 | 1183 | * put_nilfs() needs the block device. |
783f6184 RK |
1184 | */ |
1185 | return err; | |
1186 | } | |
1187 | ||
783f6184 RK |
1188 | struct file_system_type nilfs_fs_type = { |
1189 | .owner = THIS_MODULE, | |
1190 | .name = "nilfs2", | |
1191 | .get_sb = nilfs_get_sb, | |
1192 | .kill_sb = kill_block_super, | |
1193 | .fs_flags = FS_REQUIRES_DEV, | |
1194 | }; | |
1195 | ||
41c88bd7 | 1196 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1197 | { |
41c88bd7 | 1198 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1199 | |
41c88bd7 LH |
1200 | INIT_LIST_HEAD(&ii->i_dirty); |
1201 | #ifdef CONFIG_NILFS_XATTR | |
1202 | init_rwsem(&ii->xattr_sem); | |
1203 | #endif | |
1204 | nilfs_btnode_cache_init_once(&ii->i_btnode_cache); | |
1205 | ii->i_bmap = (struct nilfs_bmap *)&ii->i_bmap_union; | |
1206 | inode_init_once(&ii->vfs_inode); | |
1207 | } | |
783f6184 | 1208 | |
41c88bd7 LH |
1209 | static void nilfs_segbuf_init_once(void *obj) |
1210 | { | |
1211 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1212 | } | |
783f6184 | 1213 | |
41c88bd7 LH |
1214 | static void nilfs_destroy_cachep(void) |
1215 | { | |
84cb0999 | 1216 | if (nilfs_inode_cachep) |
41c88bd7 | 1217 | kmem_cache_destroy(nilfs_inode_cachep); |
84cb0999 | 1218 | if (nilfs_transaction_cachep) |
41c88bd7 | 1219 | kmem_cache_destroy(nilfs_transaction_cachep); |
84cb0999 | 1220 | if (nilfs_segbuf_cachep) |
41c88bd7 | 1221 | kmem_cache_destroy(nilfs_segbuf_cachep); |
84cb0999 | 1222 | if (nilfs_btree_path_cache) |
41c88bd7 LH |
1223 | kmem_cache_destroy(nilfs_btree_path_cache); |
1224 | } | |
783f6184 | 1225 | |
41c88bd7 LH |
1226 | static int __init nilfs_init_cachep(void) |
1227 | { | |
1228 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1229 | sizeof(struct nilfs_inode_info), 0, | |
1230 | SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once); | |
1231 | if (!nilfs_inode_cachep) | |
1232 | goto fail; | |
1233 | ||
1234 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1235 | sizeof(struct nilfs_transaction_info), 0, | |
1236 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1237 | if (!nilfs_transaction_cachep) | |
1238 | goto fail; | |
1239 | ||
1240 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1241 | sizeof(struct nilfs_segment_buffer), 0, | |
1242 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1243 | if (!nilfs_segbuf_cachep) | |
1244 | goto fail; | |
1245 | ||
1246 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1247 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1248 | 0, 0, NULL); | |
1249 | if (!nilfs_btree_path_cache) | |
1250 | goto fail; | |
783f6184 RK |
1251 | |
1252 | return 0; | |
1253 | ||
41c88bd7 LH |
1254 | fail: |
1255 | nilfs_destroy_cachep(); | |
1256 | return -ENOMEM; | |
1257 | } | |
1258 | ||
1259 | static int __init init_nilfs_fs(void) | |
1260 | { | |
1261 | int err; | |
783f6184 | 1262 | |
41c88bd7 LH |
1263 | err = nilfs_init_cachep(); |
1264 | if (err) | |
1265 | goto fail; | |
783f6184 | 1266 | |
41c88bd7 LH |
1267 | err = register_filesystem(&nilfs_fs_type); |
1268 | if (err) | |
1269 | goto free_cachep; | |
783f6184 | 1270 | |
9f130263 | 1271 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1272 | return 0; |
783f6184 | 1273 | |
41c88bd7 LH |
1274 | free_cachep: |
1275 | nilfs_destroy_cachep(); | |
1276 | fail: | |
783f6184 RK |
1277 | return err; |
1278 | } | |
1279 | ||
1280 | static void __exit exit_nilfs_fs(void) | |
1281 | { | |
41c88bd7 | 1282 | nilfs_destroy_cachep(); |
783f6184 RK |
1283 | unregister_filesystem(&nilfs_fs_type); |
1284 | } | |
1285 | ||
1286 | module_init(init_nilfs_fs) | |
1287 | module_exit(exit_nilfs_fs) |