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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> | |
53 | #include "nilfs.h" | |
54 | #include "mdt.h" | |
55 | #include "alloc.h" | |
56 | #include "page.h" | |
57 | #include "cpfile.h" | |
58 | #include "ifile.h" | |
59 | #include "dat.h" | |
60 | #include "segment.h" | |
61 | #include "segbuf.h" | |
62 | ||
63 | MODULE_AUTHOR("NTT Corp."); | |
64 | MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem " | |
65 | "(NILFS)"); | |
783f6184 RK |
66 | MODULE_LICENSE("GPL"); |
67 | ||
8c85e125 | 68 | static void nilfs_write_super(struct super_block *sb); |
783f6184 | 69 | static int nilfs_remount(struct super_block *sb, int *flags, char *data); |
783f6184 RK |
70 | |
71 | /** | |
72 | * nilfs_error() - report failure condition on a filesystem | |
73 | * | |
74 | * nilfs_error() sets an ERROR_FS flag on the superblock as well as | |
75 | * reporting an error message. It should be called when NILFS detects | |
76 | * incoherences or defects of meta data on disk. As for sustainable | |
77 | * errors such as a single-shot I/O error, nilfs_warning() or the printk() | |
78 | * function should be used instead. | |
79 | * | |
80 | * The segment constructor must not call this function because it can | |
81 | * kill itself. | |
82 | */ | |
83 | void nilfs_error(struct super_block *sb, const char *function, | |
84 | const char *fmt, ...) | |
85 | { | |
86 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
87 | va_list args; | |
88 | ||
89 | va_start(args, fmt); | |
90 | printk(KERN_CRIT "NILFS error (device %s): %s: ", sb->s_id, function); | |
91 | vprintk(fmt, args); | |
92 | printk("\n"); | |
93 | va_end(args); | |
94 | ||
95 | if (!(sb->s_flags & MS_RDONLY)) { | |
96 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
97 | ||
98 | if (!nilfs_test_opt(sbi, ERRORS_CONT)) | |
99 | nilfs_detach_segment_constructor(sbi); | |
100 | ||
101 | down_write(&nilfs->ns_sem); | |
102 | if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { | |
103 | nilfs->ns_mount_state |= NILFS_ERROR_FS; | |
e339ad31 RK |
104 | nilfs->ns_sbp[0]->s_state |= |
105 | cpu_to_le16(NILFS_ERROR_FS); | |
106 | nilfs_commit_super(sbi, 1); | |
783f6184 RK |
107 | } |
108 | up_write(&nilfs->ns_sem); | |
109 | ||
110 | if (nilfs_test_opt(sbi, ERRORS_RO)) { | |
111 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
112 | sb->s_flags |= MS_RDONLY; | |
113 | } | |
114 | } | |
115 | ||
116 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) | |
117 | panic("NILFS (device %s): panic forced after error\n", | |
118 | sb->s_id); | |
119 | } | |
120 | ||
121 | void nilfs_warning(struct super_block *sb, const char *function, | |
122 | const char *fmt, ...) | |
123 | { | |
124 | va_list args; | |
125 | ||
126 | va_start(args, fmt); | |
127 | printk(KERN_WARNING "NILFS warning (device %s): %s: ", | |
128 | sb->s_id, function); | |
129 | vprintk(fmt, args); | |
130 | printk("\n"); | |
131 | va_end(args); | |
132 | } | |
133 | ||
134 | static struct kmem_cache *nilfs_inode_cachep; | |
135 | ||
a53b4751 | 136 | struct inode *nilfs_alloc_inode_common(struct the_nilfs *nilfs) |
783f6184 RK |
137 | { |
138 | struct nilfs_inode_info *ii; | |
139 | ||
140 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); | |
141 | if (!ii) | |
142 | return NULL; | |
143 | ii->i_bh = NULL; | |
144 | ii->i_state = 0; | |
145 | ii->vfs_inode.i_version = 1; | |
a53b4751 | 146 | nilfs_btnode_cache_init(&ii->i_btnode_cache, nilfs->ns_bdi); |
783f6184 RK |
147 | return &ii->vfs_inode; |
148 | } | |
149 | ||
a53b4751 RK |
150 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
151 | { | |
152 | return nilfs_alloc_inode_common(NILFS_SB(sb)->s_nilfs); | |
153 | } | |
154 | ||
783f6184 RK |
155 | void nilfs_destroy_inode(struct inode *inode) |
156 | { | |
157 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); | |
158 | } | |
159 | ||
160 | static void init_once(void *obj) | |
161 | { | |
162 | struct nilfs_inode_info *ii = obj; | |
163 | ||
164 | INIT_LIST_HEAD(&ii->i_dirty); | |
165 | #ifdef CONFIG_NILFS_XATTR | |
166 | init_rwsem(&ii->xattr_sem); | |
167 | #endif | |
168 | nilfs_btnode_cache_init_once(&ii->i_btnode_cache); | |
169 | ii->i_bmap = (struct nilfs_bmap *)&ii->i_bmap_union; | |
170 | inode_init_once(&ii->vfs_inode); | |
171 | } | |
172 | ||
173 | static int nilfs_init_inode_cache(void) | |
174 | { | |
175 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
176 | sizeof(struct nilfs_inode_info), | |
177 | 0, SLAB_RECLAIM_ACCOUNT, | |
178 | init_once); | |
179 | ||
180 | return (nilfs_inode_cachep == NULL) ? -ENOMEM : 0; | |
181 | } | |
182 | ||
183 | static inline void nilfs_destroy_inode_cache(void) | |
184 | { | |
185 | kmem_cache_destroy(nilfs_inode_cachep); | |
186 | } | |
187 | ||
188 | static void nilfs_clear_inode(struct inode *inode) | |
189 | { | |
190 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
783f6184 | 191 | |
783f6184 RK |
192 | /* |
193 | * Free resources allocated in nilfs_read_inode(), here. | |
194 | */ | |
a2e7d2df | 195 | BUG_ON(!list_empty(&ii->i_dirty)); |
783f6184 RK |
196 | brelse(ii->i_bh); |
197 | ii->i_bh = NULL; | |
783f6184 RK |
198 | |
199 | if (test_bit(NILFS_I_BMAP, &ii->i_state)) | |
200 | nilfs_bmap_clear(ii->i_bmap); | |
201 | ||
202 | nilfs_btnode_cache_clear(&ii->i_btnode_cache); | |
783f6184 RK |
203 | } |
204 | ||
e339ad31 | 205 | static int nilfs_sync_super(struct nilfs_sb_info *sbi, int dupsb) |
783f6184 RK |
206 | { |
207 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
208 | int err; | |
209 | int barrier_done = 0; | |
210 | ||
211 | if (nilfs_test_opt(sbi, BARRIER)) { | |
e339ad31 | 212 | set_buffer_ordered(nilfs->ns_sbh[0]); |
783f6184 RK |
213 | barrier_done = 1; |
214 | } | |
215 | retry: | |
e339ad31 RK |
216 | set_buffer_dirty(nilfs->ns_sbh[0]); |
217 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); | |
783f6184 RK |
218 | if (err == -EOPNOTSUPP && barrier_done) { |
219 | nilfs_warning(sbi->s_super, __func__, | |
220 | "barrier-based sync failed. " | |
221 | "disabling barriers\n"); | |
222 | nilfs_clear_opt(sbi, BARRIER); | |
223 | barrier_done = 0; | |
e339ad31 | 224 | clear_buffer_ordered(nilfs->ns_sbh[0]); |
783f6184 RK |
225 | goto retry; |
226 | } | |
e339ad31 | 227 | if (unlikely(err)) { |
783f6184 RK |
228 | printk(KERN_ERR |
229 | "NILFS: unable to write superblock (err=%d)\n", err); | |
e339ad31 RK |
230 | if (err == -EIO && nilfs->ns_sbh[1]) { |
231 | nilfs_fall_back_super_block(nilfs); | |
232 | goto retry; | |
233 | } | |
234 | } else { | |
235 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; | |
236 | ||
237 | /* | |
238 | * The latest segment becomes trailable from the position | |
239 | * written in superblock. | |
240 | */ | |
783f6184 | 241 | clear_nilfs_discontinued(nilfs); |
e339ad31 RK |
242 | |
243 | /* update GC protection for recent segments */ | |
244 | if (nilfs->ns_sbh[1]) { | |
245 | sbp = NULL; | |
246 | if (dupsb) { | |
247 | set_buffer_dirty(nilfs->ns_sbh[1]); | |
248 | if (!sync_dirty_buffer(nilfs->ns_sbh[1])) | |
249 | sbp = nilfs->ns_sbp[1]; | |
250 | } | |
251 | } | |
252 | if (sbp) { | |
253 | spin_lock(&nilfs->ns_last_segment_lock); | |
254 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); | |
255 | spin_unlock(&nilfs->ns_last_segment_lock); | |
256 | } | |
783f6184 RK |
257 | } |
258 | ||
259 | return err; | |
260 | } | |
261 | ||
e339ad31 | 262 | int nilfs_commit_super(struct nilfs_sb_info *sbi, int dupsb) |
783f6184 RK |
263 | { |
264 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
e339ad31 | 265 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 266 | sector_t nfreeblocks; |
e339ad31 | 267 | time_t t; |
783f6184 RK |
268 | int err; |
269 | ||
270 | /* nilfs->sem must be locked by the caller. */ | |
e339ad31 RK |
271 | if (sbp[0]->s_magic != NILFS_SUPER_MAGIC) { |
272 | if (sbp[1] && sbp[1]->s_magic == NILFS_SUPER_MAGIC) | |
273 | nilfs_swap_super_block(nilfs); | |
274 | else { | |
275 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", | |
276 | sbi->s_super->s_id); | |
277 | return -EIO; | |
278 | } | |
279 | } | |
783f6184 RK |
280 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); |
281 | if (unlikely(err)) { | |
282 | printk(KERN_ERR "NILFS: failed to count free blocks\n"); | |
283 | return err; | |
284 | } | |
e339ad31 RK |
285 | spin_lock(&nilfs->ns_last_segment_lock); |
286 | sbp[0]->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
287 | sbp[0]->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
288 | sbp[0]->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
289 | spin_unlock(&nilfs->ns_last_segment_lock); | |
290 | ||
291 | t = get_seconds(); | |
292 | nilfs->ns_sbwtime[0] = t; | |
293 | sbp[0]->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
294 | sbp[0]->s_wtime = cpu_to_le64(t); | |
295 | sbp[0]->s_sum = 0; | |
296 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
297 | (unsigned char *)sbp[0], | |
298 | nilfs->ns_sbsize)); | |
299 | if (dupsb && sbp[1]) { | |
300 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
301 | nilfs->ns_sbwtime[1] = t; | |
302 | } | |
783f6184 | 303 | sbi->s_super->s_dirt = 0; |
e339ad31 | 304 | return nilfs_sync_super(sbi, dupsb); |
783f6184 RK |
305 | } |
306 | ||
307 | static void nilfs_put_super(struct super_block *sb) | |
308 | { | |
309 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
310 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
311 | ||
6cfd0148 CH |
312 | lock_kernel(); |
313 | ||
8c85e125 CH |
314 | if (sb->s_dirt) |
315 | nilfs_write_super(sb); | |
316 | ||
783f6184 RK |
317 | nilfs_detach_segment_constructor(sbi); |
318 | ||
319 | if (!(sb->s_flags & MS_RDONLY)) { | |
320 | down_write(&nilfs->ns_sem); | |
e339ad31 RK |
321 | nilfs->ns_sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state); |
322 | nilfs_commit_super(sbi, 1); | |
783f6184 RK |
323 | up_write(&nilfs->ns_sem); |
324 | } | |
e59399d0 | 325 | down_write(&nilfs->ns_super_sem); |
3f82ff55 RK |
326 | if (nilfs->ns_current == sbi) |
327 | nilfs->ns_current = NULL; | |
e59399d0 | 328 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
329 | |
330 | nilfs_detach_checkpoint(sbi); | |
331 | put_nilfs(sbi->s_nilfs); | |
332 | sbi->s_super = NULL; | |
333 | sb->s_fs_info = NULL; | |
6dd47406 | 334 | nilfs_put_sbinfo(sbi); |
6cfd0148 CH |
335 | |
336 | unlock_kernel(); | |
783f6184 RK |
337 | } |
338 | ||
339 | /** | |
340 | * nilfs_write_super - write super block(s) of NILFS | |
341 | * @sb: super_block | |
342 | * | |
343 | * nilfs_write_super() gets a fs-dependent lock, writes super block(s), and | |
344 | * clears s_dirt. This function is called in the section protected by | |
345 | * lock_super(). | |
346 | * | |
347 | * The s_dirt flag is managed by each filesystem and we protect it by ns_sem | |
348 | * of the struct the_nilfs. Lock order must be as follows: | |
349 | * | |
350 | * 1. lock_super() | |
351 | * 2. down_write(&nilfs->ns_sem) | |
352 | * | |
353 | * Inside NILFS, locking ns_sem is enough to protect s_dirt and the buffer | |
e339ad31 | 354 | * of the super block (nilfs->ns_sbp[]). |
783f6184 RK |
355 | * |
356 | * In most cases, VFS functions call lock_super() before calling these | |
357 | * methods. So we must be careful not to bring on deadlocks when using | |
358 | * lock_super(); see generic_shutdown_super(), write_super(), and so on. | |
359 | * | |
360 | * Note that order of lock_kernel() and lock_super() depends on contexts | |
361 | * of VFS. We should also note that lock_kernel() can be used in its | |
362 | * protective section and only the outermost one has an effect. | |
363 | */ | |
364 | static void nilfs_write_super(struct super_block *sb) | |
365 | { | |
366 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
367 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
368 | ||
369 | down_write(&nilfs->ns_sem); | |
e339ad31 RK |
370 | if (!(sb->s_flags & MS_RDONLY)) { |
371 | struct nilfs_super_block **sbp = nilfs->ns_sbp; | |
372 | u64 t = get_seconds(); | |
373 | int dupsb; | |
374 | ||
375 | if (!nilfs_discontinued(nilfs) && t >= nilfs->ns_sbwtime[0] && | |
376 | t < nilfs->ns_sbwtime[0] + NILFS_SB_FREQ) { | |
377 | up_write(&nilfs->ns_sem); | |
378 | return; | |
379 | } | |
380 | dupsb = sbp[1] && t > nilfs->ns_sbwtime[1] + NILFS_ALTSB_FREQ; | |
381 | nilfs_commit_super(sbi, dupsb); | |
382 | } | |
783f6184 RK |
383 | sb->s_dirt = 0; |
384 | up_write(&nilfs->ns_sem); | |
385 | } | |
386 | ||
387 | static int nilfs_sync_fs(struct super_block *sb, int wait) | |
388 | { | |
389 | int err = 0; | |
390 | ||
d731e063 CH |
391 | nilfs_write_super(sb); |
392 | ||
783f6184 RK |
393 | /* This function is called when super block should be written back */ |
394 | if (wait) | |
395 | err = nilfs_construct_segment(sb); | |
396 | return err; | |
397 | } | |
398 | ||
399 | int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno) | |
400 | { | |
401 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
402 | struct nilfs_checkpoint *raw_cp; | |
403 | struct buffer_head *bh_cp; | |
404 | int err; | |
405 | ||
e59399d0 | 406 | down_write(&nilfs->ns_super_sem); |
783f6184 | 407 | list_add(&sbi->s_list, &nilfs->ns_supers); |
e59399d0 | 408 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
409 | |
410 | sbi->s_ifile = nilfs_mdt_new( | |
411 | nilfs, sbi->s_super, NILFS_IFILE_INO, NILFS_IFILE_GFP); | |
412 | if (!sbi->s_ifile) | |
413 | return -ENOMEM; | |
414 | ||
415 | err = nilfs_palloc_init_blockgroup(sbi->s_ifile, nilfs->ns_inode_size); | |
416 | if (unlikely(err)) | |
417 | goto failed; | |
418 | ||
419 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, | |
420 | &bh_cp); | |
421 | if (unlikely(err)) { | |
422 | if (err == -ENOENT || err == -EINVAL) { | |
423 | printk(KERN_ERR | |
424 | "NILFS: Invalid checkpoint " | |
425 | "(checkpoint number=%llu)\n", | |
426 | (unsigned long long)cno); | |
427 | err = -EINVAL; | |
428 | } | |
429 | goto failed; | |
430 | } | |
431 | err = nilfs_read_inode_common(sbi->s_ifile, &raw_cp->cp_ifile_inode); | |
432 | if (unlikely(err)) | |
433 | goto failed_bh; | |
434 | atomic_set(&sbi->s_inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); | |
435 | atomic_set(&sbi->s_blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); | |
436 | ||
437 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
438 | return 0; | |
439 | ||
440 | failed_bh: | |
441 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
442 | failed: | |
443 | nilfs_mdt_destroy(sbi->s_ifile); | |
444 | sbi->s_ifile = NULL; | |
445 | ||
e59399d0 | 446 | down_write(&nilfs->ns_super_sem); |
783f6184 | 447 | list_del_init(&sbi->s_list); |
e59399d0 | 448 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
449 | |
450 | return err; | |
451 | } | |
452 | ||
453 | void nilfs_detach_checkpoint(struct nilfs_sb_info *sbi) | |
454 | { | |
455 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
456 | ||
457 | nilfs_mdt_clear(sbi->s_ifile); | |
458 | nilfs_mdt_destroy(sbi->s_ifile); | |
459 | sbi->s_ifile = NULL; | |
e59399d0 | 460 | down_write(&nilfs->ns_super_sem); |
783f6184 | 461 | list_del_init(&sbi->s_list); |
e59399d0 | 462 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
463 | } |
464 | ||
465 | static int nilfs_mark_recovery_complete(struct nilfs_sb_info *sbi) | |
466 | { | |
467 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
468 | int err = 0; | |
469 | ||
470 | down_write(&nilfs->ns_sem); | |
471 | if (!(nilfs->ns_mount_state & NILFS_VALID_FS)) { | |
472 | nilfs->ns_mount_state |= NILFS_VALID_FS; | |
e339ad31 | 473 | err = nilfs_commit_super(sbi, 1); |
783f6184 RK |
474 | if (likely(!err)) |
475 | printk(KERN_INFO "NILFS: recovery complete.\n"); | |
476 | } | |
477 | up_write(&nilfs->ns_sem); | |
478 | return err; | |
479 | } | |
480 | ||
481 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
482 | { | |
483 | struct super_block *sb = dentry->d_sb; | |
484 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
c306af23 RK |
485 | struct the_nilfs *nilfs = sbi->s_nilfs; |
486 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
783f6184 RK |
487 | unsigned long long blocks; |
488 | unsigned long overhead; | |
489 | unsigned long nrsvblocks; | |
490 | sector_t nfreeblocks; | |
783f6184 RK |
491 | int err; |
492 | ||
493 | /* | |
494 | * Compute all of the segment blocks | |
495 | * | |
496 | * The blocks before first segment and after last segment | |
497 | * are excluded. | |
498 | */ | |
499 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
500 | - nilfs->ns_first_data_block; | |
501 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
502 | ||
503 | /* | |
504 | * Compute the overhead | |
505 | * | |
506 | * When distributing meta data blocks outside semgent structure, | |
507 | * We must count them as the overhead. | |
508 | */ | |
509 | overhead = 0; | |
510 | ||
511 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
512 | if (unlikely(err)) | |
513 | return err; | |
514 | ||
515 | buf->f_type = NILFS_SUPER_MAGIC; | |
516 | buf->f_bsize = sb->s_blocksize; | |
517 | buf->f_blocks = blocks - overhead; | |
518 | buf->f_bfree = nfreeblocks; | |
519 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
520 | (buf->f_bfree - nrsvblocks) : 0; | |
521 | buf->f_files = atomic_read(&sbi->s_inodes_count); | |
522 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ | |
523 | buf->f_namelen = NILFS_NAME_LEN; | |
c306af23 RK |
524 | buf->f_fsid.val[0] = (u32)id; |
525 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
526 | ||
783f6184 RK |
527 | return 0; |
528 | } | |
529 | ||
530 | static struct super_operations nilfs_sops = { | |
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, */ | |
537 | .delete_inode = nilfs_delete_inode, | |
538 | .put_super = nilfs_put_super, | |
539 | .write_super = nilfs_write_super, | |
540 | .sync_fs = nilfs_sync_fs, | |
541 | /* .write_super_lockfs */ | |
542 | /* .unlockfs */ | |
543 | .statfs = nilfs_statfs, | |
544 | .remount_fs = nilfs_remount, | |
545 | .clear_inode = nilfs_clear_inode, | |
546 | /* .umount_begin */ | |
547 | /* .show_options */ | |
548 | }; | |
549 | ||
550 | static struct inode * | |
551 | nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation) | |
552 | { | |
553 | struct inode *inode; | |
554 | ||
555 | if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO && | |
556 | ino != NILFS_SKETCH_INO) | |
557 | return ERR_PTR(-ESTALE); | |
558 | ||
559 | inode = nilfs_iget(sb, ino); | |
560 | if (IS_ERR(inode)) | |
561 | return ERR_CAST(inode); | |
562 | if (generation && inode->i_generation != generation) { | |
563 | iput(inode); | |
564 | return ERR_PTR(-ESTALE); | |
565 | } | |
566 | ||
567 | return inode; | |
568 | } | |
569 | ||
570 | static struct dentry * | |
571 | nilfs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, | |
572 | int fh_type) | |
573 | { | |
574 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
575 | nilfs_nfs_get_inode); | |
576 | } | |
577 | ||
578 | static struct dentry * | |
579 | nilfs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, | |
580 | int fh_type) | |
581 | { | |
582 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
583 | nilfs_nfs_get_inode); | |
584 | } | |
585 | ||
586 | static struct export_operations nilfs_export_ops = { | |
587 | .fh_to_dentry = nilfs_fh_to_dentry, | |
588 | .fh_to_parent = nilfs_fh_to_parent, | |
589 | .get_parent = nilfs_get_parent, | |
590 | }; | |
591 | ||
592 | enum { | |
593 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
594 | Opt_barrier, Opt_snapshot, Opt_order, | |
595 | Opt_err, | |
596 | }; | |
597 | ||
598 | static match_table_t tokens = { | |
599 | {Opt_err_cont, "errors=continue"}, | |
600 | {Opt_err_panic, "errors=panic"}, | |
601 | {Opt_err_ro, "errors=remount-ro"}, | |
602 | {Opt_barrier, "barrier=%s"}, | |
603 | {Opt_snapshot, "cp=%u"}, | |
604 | {Opt_order, "order=%s"}, | |
605 | {Opt_err, NULL} | |
606 | }; | |
607 | ||
608 | static int match_bool(substring_t *s, int *result) | |
609 | { | |
610 | int len = s->to - s->from; | |
611 | ||
612 | if (strncmp(s->from, "on", len) == 0) | |
613 | *result = 1; | |
614 | else if (strncmp(s->from, "off", len) == 0) | |
615 | *result = 0; | |
616 | else | |
617 | return 1; | |
618 | return 0; | |
619 | } | |
620 | ||
621 | static int parse_options(char *options, struct super_block *sb) | |
622 | { | |
623 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
624 | char *p; | |
625 | substring_t args[MAX_OPT_ARGS]; | |
626 | int option; | |
627 | ||
628 | if (!options) | |
629 | return 1; | |
630 | ||
631 | while ((p = strsep(&options, ",")) != NULL) { | |
632 | int token; | |
633 | if (!*p) | |
634 | continue; | |
635 | ||
636 | token = match_token(p, tokens, args); | |
637 | switch (token) { | |
638 | case Opt_barrier: | |
639 | if (match_bool(&args[0], &option)) | |
640 | return 0; | |
641 | if (option) | |
642 | nilfs_set_opt(sbi, BARRIER); | |
643 | else | |
644 | nilfs_clear_opt(sbi, BARRIER); | |
645 | break; | |
646 | case Opt_order: | |
647 | if (strcmp(args[0].from, "relaxed") == 0) | |
648 | /* Ordered data semantics */ | |
649 | nilfs_clear_opt(sbi, STRICT_ORDER); | |
650 | else if (strcmp(args[0].from, "strict") == 0) | |
651 | /* Strict in-order semantics */ | |
652 | nilfs_set_opt(sbi, STRICT_ORDER); | |
653 | else | |
654 | return 0; | |
655 | break; | |
656 | case Opt_err_panic: | |
657 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC); | |
658 | break; | |
659 | case Opt_err_ro: | |
660 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO); | |
661 | break; | |
662 | case Opt_err_cont: | |
663 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT); | |
664 | break; | |
665 | case Opt_snapshot: | |
666 | if (match_int(&args[0], &option) || option <= 0) | |
667 | return 0; | |
668 | if (!(sb->s_flags & MS_RDONLY)) | |
669 | return 0; | |
670 | sbi->s_snapshot_cno = option; | |
671 | nilfs_set_opt(sbi, SNAPSHOT); | |
672 | break; | |
673 | default: | |
674 | printk(KERN_ERR | |
675 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
676 | return 0; | |
677 | } | |
678 | } | |
679 | return 1; | |
680 | } | |
681 | ||
682 | static inline void | |
683 | nilfs_set_default_options(struct nilfs_sb_info *sbi, | |
684 | struct nilfs_super_block *sbp) | |
685 | { | |
686 | sbi->s_mount_opt = | |
687 | NILFS_MOUNT_ERRORS_CONT | NILFS_MOUNT_BARRIER; | |
688 | } | |
689 | ||
690 | static int nilfs_setup_super(struct nilfs_sb_info *sbi) | |
691 | { | |
692 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
e339ad31 | 693 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; |
783f6184 RK |
694 | int max_mnt_count = le16_to_cpu(sbp->s_max_mnt_count); |
695 | int mnt_count = le16_to_cpu(sbp->s_mnt_count); | |
696 | ||
697 | /* nilfs->sem must be locked by the caller. */ | |
698 | if (!(nilfs->ns_mount_state & NILFS_VALID_FS)) { | |
699 | printk(KERN_WARNING "NILFS warning: mounting unchecked fs\n"); | |
700 | } else if (nilfs->ns_mount_state & NILFS_ERROR_FS) { | |
701 | printk(KERN_WARNING | |
702 | "NILFS warning: mounting fs with errors\n"); | |
703 | #if 0 | |
704 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
705 | printk(KERN_WARNING | |
706 | "NILFS warning: maximal mount count reached\n"); | |
707 | #endif | |
708 | } | |
709 | if (!max_mnt_count) | |
710 | sbp->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); | |
711 | ||
712 | sbp->s_mnt_count = cpu_to_le16(mnt_count + 1); | |
713 | sbp->s_state = cpu_to_le16(le16_to_cpu(sbp->s_state) & ~NILFS_VALID_FS); | |
714 | sbp->s_mtime = cpu_to_le64(get_seconds()); | |
e339ad31 | 715 | return nilfs_commit_super(sbi, 1); |
783f6184 RK |
716 | } |
717 | ||
e339ad31 RK |
718 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
719 | u64 pos, int blocksize, | |
720 | struct buffer_head **pbh) | |
783f6184 | 721 | { |
e339ad31 RK |
722 | unsigned long long sb_index = pos; |
723 | unsigned long offset; | |
783f6184 | 724 | |
e339ad31 | 725 | offset = do_div(sb_index, blocksize); |
783f6184 | 726 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 727 | if (!*pbh) |
783f6184 | 728 | return NULL; |
783f6184 RK |
729 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
730 | } | |
731 | ||
783f6184 RK |
732 | int nilfs_store_magic_and_option(struct super_block *sb, |
733 | struct nilfs_super_block *sbp, | |
734 | char *data) | |
735 | { | |
736 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
737 | ||
783f6184 RK |
738 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
739 | ||
740 | /* FS independent flags */ | |
741 | #ifdef NILFS_ATIME_DISABLE | |
742 | sb->s_flags |= MS_NOATIME; | |
743 | #endif | |
744 | ||
783f6184 RK |
745 | nilfs_set_default_options(sbi, sbp); |
746 | ||
747 | sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid); | |
748 | sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid); | |
749 | sbi->s_interval = le32_to_cpu(sbp->s_c_interval); | |
750 | sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max); | |
751 | ||
e339ad31 | 752 | return !parse_options(data, sb) ? -EINVAL : 0 ; |
783f6184 RK |
753 | } |
754 | ||
755 | /** | |
756 | * nilfs_fill_super() - initialize a super block instance | |
757 | * @sb: super_block | |
758 | * @data: mount options | |
759 | * @silent: silent mode flag | |
760 | * @nilfs: the_nilfs struct | |
761 | * | |
aa7dfb89 | 762 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
763 | * So, the recovery process is protected from other simultaneous mounts. |
764 | */ | |
765 | static int | |
766 | nilfs_fill_super(struct super_block *sb, void *data, int silent, | |
767 | struct the_nilfs *nilfs) | |
768 | { | |
769 | struct nilfs_sb_info *sbi; | |
770 | struct inode *root; | |
771 | __u64 cno; | |
772 | int err; | |
773 | ||
774 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
775 | if (!sbi) | |
776 | return -ENOMEM; | |
777 | ||
778 | sb->s_fs_info = sbi; | |
779 | ||
780 | get_nilfs(nilfs); | |
781 | sbi->s_nilfs = nilfs; | |
782 | sbi->s_super = sb; | |
6dd47406 | 783 | atomic_set(&sbi->s_count, 1); |
783f6184 RK |
784 | |
785 | err = init_nilfs(nilfs, sbi, (char *)data); | |
786 | if (err) | |
787 | goto failed_sbi; | |
788 | ||
789 | spin_lock_init(&sbi->s_inode_lock); | |
790 | INIT_LIST_HEAD(&sbi->s_dirty_files); | |
791 | INIT_LIST_HEAD(&sbi->s_list); | |
792 | ||
793 | /* | |
794 | * Following initialization is overlapped because | |
795 | * nilfs_sb_info structure has been cleared at the beginning. | |
796 | * But we reserve them to keep our interest and make ready | |
797 | * for the future change. | |
798 | */ | |
799 | get_random_bytes(&sbi->s_next_generation, | |
800 | sizeof(sbi->s_next_generation)); | |
801 | spin_lock_init(&sbi->s_next_gen_lock); | |
802 | ||
803 | sb->s_op = &nilfs_sops; | |
804 | sb->s_export_op = &nilfs_export_ops; | |
805 | sb->s_root = NULL; | |
61239230 | 806 | sb->s_time_gran = 1; |
783f6184 RK |
807 | |
808 | if (!nilfs_loaded(nilfs)) { | |
809 | err = load_nilfs(nilfs, sbi); | |
810 | if (err) | |
811 | goto failed_sbi; | |
812 | } | |
813 | cno = nilfs_last_cno(nilfs); | |
814 | ||
815 | if (sb->s_flags & MS_RDONLY) { | |
816 | if (nilfs_test_opt(sbi, SNAPSHOT)) { | |
1f5abe7e RK |
817 | err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, |
818 | sbi->s_snapshot_cno); | |
819 | if (err < 0) | |
820 | goto failed_sbi; | |
821 | if (!err) { | |
783f6184 RK |
822 | printk(KERN_ERR |
823 | "NILFS: The specified checkpoint is " | |
824 | "not a snapshot " | |
825 | "(checkpoint number=%llu).\n", | |
826 | (unsigned long long)sbi->s_snapshot_cno); | |
827 | err = -EINVAL; | |
828 | goto failed_sbi; | |
829 | } | |
830 | cno = sbi->s_snapshot_cno; | |
831 | } else | |
832 | /* Read-only mount */ | |
833 | sbi->s_snapshot_cno = cno; | |
834 | } | |
835 | ||
836 | err = nilfs_attach_checkpoint(sbi, cno); | |
837 | if (err) { | |
838 | printk(KERN_ERR "NILFS: error loading a checkpoint" | |
839 | " (checkpoint number=%llu).\n", (unsigned long long)cno); | |
840 | goto failed_sbi; | |
841 | } | |
842 | ||
843 | if (!(sb->s_flags & MS_RDONLY)) { | |
cece5520 | 844 | err = nilfs_attach_segment_constructor(sbi); |
783f6184 RK |
845 | if (err) |
846 | goto failed_checkpoint; | |
847 | } | |
848 | ||
849 | root = nilfs_iget(sb, NILFS_ROOT_INO); | |
850 | if (IS_ERR(root)) { | |
851 | printk(KERN_ERR "NILFS: get root inode failed\n"); | |
852 | err = PTR_ERR(root); | |
853 | goto failed_segctor; | |
854 | } | |
855 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
856 | iput(root); | |
857 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); | |
858 | err = -EINVAL; | |
859 | goto failed_segctor; | |
860 | } | |
861 | sb->s_root = d_alloc_root(root); | |
862 | if (!sb->s_root) { | |
863 | iput(root); | |
864 | printk(KERN_ERR "NILFS: get root dentry failed\n"); | |
865 | err = -ENOMEM; | |
866 | goto failed_segctor; | |
867 | } | |
868 | ||
869 | if (!(sb->s_flags & MS_RDONLY)) { | |
870 | down_write(&nilfs->ns_sem); | |
871 | nilfs_setup_super(sbi); | |
872 | up_write(&nilfs->ns_sem); | |
873 | } | |
874 | ||
875 | err = nilfs_mark_recovery_complete(sbi); | |
876 | if (unlikely(err)) { | |
877 | printk(KERN_ERR "NILFS: recovery failed.\n"); | |
878 | goto failed_root; | |
879 | } | |
880 | ||
e59399d0 | 881 | down_write(&nilfs->ns_super_sem); |
3f82ff55 RK |
882 | if (!nilfs_test_opt(sbi, SNAPSHOT)) |
883 | nilfs->ns_current = sbi; | |
e59399d0 | 884 | up_write(&nilfs->ns_super_sem); |
3f82ff55 | 885 | |
783f6184 RK |
886 | return 0; |
887 | ||
888 | failed_root: | |
889 | dput(sb->s_root); | |
890 | sb->s_root = NULL; | |
891 | ||
892 | failed_segctor: | |
893 | nilfs_detach_segment_constructor(sbi); | |
894 | ||
895 | failed_checkpoint: | |
896 | nilfs_detach_checkpoint(sbi); | |
897 | ||
898 | failed_sbi: | |
899 | put_nilfs(nilfs); | |
900 | sb->s_fs_info = NULL; | |
6dd47406 | 901 | nilfs_put_sbinfo(sbi); |
783f6184 RK |
902 | return err; |
903 | } | |
904 | ||
905 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
906 | { | |
907 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
908 | struct nilfs_super_block *sbp; | |
909 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
910 | unsigned long old_sb_flags; | |
911 | struct nilfs_mount_options old_opts; | |
912 | int err; | |
913 | ||
337eb00a AIB |
914 | lock_kernel(); |
915 | ||
e59399d0 | 916 | down_write(&nilfs->ns_super_sem); |
783f6184 RK |
917 | old_sb_flags = sb->s_flags; |
918 | old_opts.mount_opt = sbi->s_mount_opt; | |
919 | old_opts.snapshot_cno = sbi->s_snapshot_cno; | |
920 | ||
921 | if (!parse_options(data, sb)) { | |
922 | err = -EINVAL; | |
923 | goto restore_opts; | |
924 | } | |
925 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); | |
926 | ||
927 | if ((*flags & MS_RDONLY) && | |
928 | sbi->s_snapshot_cno != old_opts.snapshot_cno) { | |
929 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
930 | "remount to a different snapshot. \n", | |
931 | sb->s_id); | |
932 | err = -EINVAL; | |
933 | goto restore_opts; | |
934 | } | |
935 | ||
936 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) | |
937 | goto out; | |
938 | if (*flags & MS_RDONLY) { | |
939 | /* Shutting down the segment constructor */ | |
940 | nilfs_detach_segment_constructor(sbi); | |
941 | sb->s_flags |= MS_RDONLY; | |
942 | ||
943 | sbi->s_snapshot_cno = nilfs_last_cno(nilfs); | |
944 | /* nilfs_set_opt(sbi, SNAPSHOT); */ | |
945 | ||
946 | /* | |
947 | * Remounting a valid RW partition RDONLY, so set | |
948 | * the RDONLY flag and then mark the partition as valid again. | |
949 | */ | |
950 | down_write(&nilfs->ns_sem); | |
e339ad31 | 951 | sbp = nilfs->ns_sbp[0]; |
783f6184 RK |
952 | if (!(sbp->s_state & le16_to_cpu(NILFS_VALID_FS)) && |
953 | (nilfs->ns_mount_state & NILFS_VALID_FS)) | |
954 | sbp->s_state = cpu_to_le16(nilfs->ns_mount_state); | |
955 | sbp->s_mtime = cpu_to_le64(get_seconds()); | |
e339ad31 | 956 | nilfs_commit_super(sbi, 1); |
783f6184 RK |
957 | up_write(&nilfs->ns_sem); |
958 | } else { | |
959 | /* | |
960 | * Mounting a RDONLY partition read-write, so reread and | |
961 | * store the current valid flag. (It may have been changed | |
962 | * by fsck since we originally mounted the partition.) | |
963 | */ | |
3f82ff55 | 964 | if (nilfs->ns_current && nilfs->ns_current != sbi) { |
783f6184 | 965 | printk(KERN_WARNING "NILFS (device %s): couldn't " |
3f82ff55 | 966 | "remount because an RW-mount exists.\n", |
783f6184 RK |
967 | sb->s_id); |
968 | err = -EBUSY; | |
e59399d0 | 969 | goto restore_opts; |
783f6184 RK |
970 | } |
971 | if (sbi->s_snapshot_cno != nilfs_last_cno(nilfs)) { | |
972 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
973 | "remount because the current RO-mount is not " | |
974 | "the latest one.\n", | |
975 | sb->s_id); | |
976 | err = -EINVAL; | |
e59399d0 | 977 | goto restore_opts; |
783f6184 RK |
978 | } |
979 | sb->s_flags &= ~MS_RDONLY; | |
980 | nilfs_clear_opt(sbi, SNAPSHOT); | |
981 | sbi->s_snapshot_cno = 0; | |
982 | ||
cece5520 | 983 | err = nilfs_attach_segment_constructor(sbi); |
783f6184 | 984 | if (err) |
e59399d0 | 985 | goto restore_opts; |
783f6184 RK |
986 | |
987 | down_write(&nilfs->ns_sem); | |
988 | nilfs_setup_super(sbi); | |
989 | up_write(&nilfs->ns_sem); | |
990 | ||
e59399d0 | 991 | nilfs->ns_current = sbi; |
783f6184 RK |
992 | } |
993 | out: | |
e59399d0 | 994 | up_write(&nilfs->ns_super_sem); |
337eb00a | 995 | unlock_kernel(); |
783f6184 RK |
996 | return 0; |
997 | ||
783f6184 RK |
998 | restore_opts: |
999 | sb->s_flags = old_sb_flags; | |
1000 | sbi->s_mount_opt = old_opts.mount_opt; | |
1001 | sbi->s_snapshot_cno = old_opts.snapshot_cno; | |
e59399d0 | 1002 | up_write(&nilfs->ns_super_sem); |
337eb00a | 1003 | unlock_kernel(); |
783f6184 RK |
1004 | return err; |
1005 | } | |
1006 | ||
1007 | struct nilfs_super_data { | |
1008 | struct block_device *bdev; | |
6dd47406 | 1009 | struct nilfs_sb_info *sbi; |
783f6184 RK |
1010 | __u64 cno; |
1011 | int flags; | |
1012 | }; | |
1013 | ||
1014 | /** | |
1015 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
1016 | * @data: mount options | |
1017 | * @sd: nilfs_super_data | |
1018 | */ | |
1019 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
1020 | { | |
1021 | char *p, *options = data; | |
1022 | substring_t args[MAX_OPT_ARGS]; | |
1023 | int option, token; | |
1024 | int ret = 0; | |
1025 | ||
1026 | do { | |
1027 | p = strsep(&options, ","); | |
1028 | if (p != NULL && *p) { | |
1029 | token = match_token(p, tokens, args); | |
1030 | if (token == Opt_snapshot) { | |
1031 | if (!(sd->flags & MS_RDONLY)) | |
1032 | ret++; | |
1033 | else { | |
1034 | ret = match_int(&args[0], &option); | |
1035 | if (!ret) { | |
1036 | if (option > 0) | |
1037 | sd->cno = option; | |
1038 | else | |
1039 | ret++; | |
1040 | } | |
1041 | } | |
1042 | } | |
1043 | if (ret) | |
1044 | printk(KERN_ERR | |
1045 | "NILFS: invalid mount option: %s\n", p); | |
1046 | } | |
1047 | if (!options) | |
1048 | break; | |
1049 | BUG_ON(options == data); | |
1050 | *(options - 1) = ','; | |
1051 | } while (!ret); | |
1052 | return ret; | |
1053 | } | |
1054 | ||
1055 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1056 | { | |
1057 | struct nilfs_super_data *sd = data; | |
1058 | ||
1059 | s->s_bdev = sd->bdev; | |
1060 | s->s_dev = s->s_bdev->bd_dev; | |
1061 | return 0; | |
1062 | } | |
1063 | ||
1064 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 RK |
1065 | { |
1066 | struct nilfs_super_data *sd = data; | |
6dd47406 RK |
1067 | |
1068 | return sd->sbi && s->s_fs_info == (void *)sd->sbi; | |
783f6184 RK |
1069 | } |
1070 | ||
1071 | static int | |
1072 | nilfs_get_sb(struct file_system_type *fs_type, int flags, | |
1073 | const char *dev_name, void *data, struct vfsmount *mnt) | |
1074 | { | |
1075 | struct nilfs_super_data sd; | |
33c8e57c RK |
1076 | struct super_block *s; |
1077 | struct the_nilfs *nilfs; | |
783f6184 RK |
1078 | int err, need_to_close = 1; |
1079 | ||
1080 | sd.bdev = open_bdev_exclusive(dev_name, flags, fs_type); | |
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 | ||
33c8e57c RK |
1128 | if (!sd.cno) |
1129 | /* trying to get the latest checkpoint. */ | |
1130 | sd.cno = nilfs_last_cno(nilfs); | |
783f6184 | 1131 | |
6dd47406 RK |
1132 | /* |
1133 | * Get super block instance holding the nilfs_sb_info struct. | |
1134 | * A new instance is allocated if no existing mount is present or | |
1135 | * existing instance has been unmounted. | |
1136 | */ | |
33c8e57c | 1137 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, &sd); |
6dd47406 RK |
1138 | if (sd.sbi) |
1139 | nilfs_put_sbinfo(sd.sbi); | |
1140 | ||
33c8e57c RK |
1141 | if (IS_ERR(s)) { |
1142 | err = PTR_ERR(s); | |
1143 | goto failed_unlock; | |
783f6184 RK |
1144 | } |
1145 | ||
1146 | if (!s->s_root) { | |
1147 | char b[BDEVNAME_SIZE]; | |
1148 | ||
33c8e57c | 1149 | /* New superblock instance created */ |
783f6184 RK |
1150 | s->s_flags = flags; |
1151 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); | |
1152 | sb_set_blocksize(s, block_size(sd.bdev)); | |
1153 | ||
1154 | err = nilfs_fill_super(s, data, flags & MS_VERBOSE, nilfs); | |
1155 | if (err) | |
1156 | goto cancel_new; | |
1157 | ||
1158 | s->s_flags |= MS_ACTIVE; | |
1159 | need_to_close = 0; | |
783f6184 RK |
1160 | } |
1161 | ||
aa7dfb89 | 1162 | mutex_unlock(&nilfs->ns_mount_mutex); |
783f6184 RK |
1163 | put_nilfs(nilfs); |
1164 | if (need_to_close) | |
1165 | close_bdev_exclusive(sd.bdev, flags); | |
1166 | simple_set_mnt(mnt, s); | |
1167 | return 0; | |
1168 | ||
783f6184 | 1169 | failed_unlock: |
aa7dfb89 | 1170 | mutex_unlock(&nilfs->ns_mount_mutex); |
33c8e57c | 1171 | put_nilfs(nilfs); |
783f6184 RK |
1172 | failed: |
1173 | close_bdev_exclusive(sd.bdev, flags); | |
1174 | ||
1175 | return err; | |
1176 | ||
1177 | cancel_new: | |
1178 | /* Abandoning the newly allocated superblock */ | |
aa7dfb89 | 1179 | mutex_unlock(&nilfs->ns_mount_mutex); |
33c8e57c | 1180 | put_nilfs(nilfs); |
783f6184 RK |
1181 | up_write(&s->s_umount); |
1182 | deactivate_super(s); | |
1183 | /* | |
1184 | * deactivate_super() invokes close_bdev_exclusive(). | |
1185 | * We must finish all post-cleaning before this call; | |
aa7dfb89 | 1186 | * put_nilfs() needs the block device. |
783f6184 RK |
1187 | */ |
1188 | return err; | |
1189 | } | |
1190 | ||
783f6184 RK |
1191 | struct file_system_type nilfs_fs_type = { |
1192 | .owner = THIS_MODULE, | |
1193 | .name = "nilfs2", | |
1194 | .get_sb = nilfs_get_sb, | |
1195 | .kill_sb = kill_block_super, | |
1196 | .fs_flags = FS_REQUIRES_DEV, | |
1197 | }; | |
1198 | ||
1199 | static int __init init_nilfs_fs(void) | |
1200 | { | |
1201 | int err; | |
1202 | ||
1203 | err = nilfs_init_inode_cache(); | |
1204 | if (err) | |
1205 | goto failed; | |
1206 | ||
1207 | err = nilfs_init_transaction_cache(); | |
1208 | if (err) | |
1209 | goto failed_inode_cache; | |
1210 | ||
1211 | err = nilfs_init_segbuf_cache(); | |
1212 | if (err) | |
1213 | goto failed_transaction_cache; | |
1214 | ||
1215 | err = nilfs_btree_path_cache_init(); | |
1216 | if (err) | |
1217 | goto failed_segbuf_cache; | |
1218 | ||
1219 | err = register_filesystem(&nilfs_fs_type); | |
1220 | if (err) | |
1221 | goto failed_btree_path_cache; | |
1222 | ||
1223 | return 0; | |
1224 | ||
1225 | failed_btree_path_cache: | |
1226 | nilfs_btree_path_cache_destroy(); | |
1227 | ||
1228 | failed_segbuf_cache: | |
1229 | nilfs_destroy_segbuf_cache(); | |
1230 | ||
1231 | failed_transaction_cache: | |
1232 | nilfs_destroy_transaction_cache(); | |
1233 | ||
1234 | failed_inode_cache: | |
1235 | nilfs_destroy_inode_cache(); | |
1236 | ||
1237 | failed: | |
1238 | return err; | |
1239 | } | |
1240 | ||
1241 | static void __exit exit_nilfs_fs(void) | |
1242 | { | |
1243 | nilfs_destroy_segbuf_cache(); | |
1244 | nilfs_destroy_transaction_cache(); | |
1245 | nilfs_destroy_inode_cache(); | |
1246 | nilfs_btree_path_cache_destroy(); | |
1247 | unregister_filesystem(&nilfs_fs_type); | |
1248 | } | |
1249 | ||
1250 | module_init(init_nilfs_fs) | |
1251 | module_exit(exit_nilfs_fs) |