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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 | ||
70 | static int nilfs_remount(struct super_block *sb, int *flags, char *data); | |
783f6184 RK |
71 | |
72 | /** | |
73 | * nilfs_error() - report failure condition on a filesystem | |
74 | * | |
75 | * nilfs_error() sets an ERROR_FS flag on the superblock as well as | |
76 | * reporting an error message. It should be called when NILFS detects | |
77 | * incoherences or defects of meta data on disk. As for sustainable | |
78 | * errors such as a single-shot I/O error, nilfs_warning() or the printk() | |
79 | * function should be used instead. | |
80 | * | |
81 | * The segment constructor must not call this function because it can | |
82 | * kill itself. | |
83 | */ | |
84 | void nilfs_error(struct super_block *sb, const char *function, | |
85 | const char *fmt, ...) | |
86 | { | |
87 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
88 | va_list args; | |
89 | ||
90 | va_start(args, fmt); | |
91 | printk(KERN_CRIT "NILFS error (device %s): %s: ", sb->s_id, function); | |
92 | vprintk(fmt, args); | |
93 | printk("\n"); | |
94 | va_end(args); | |
95 | ||
96 | if (!(sb->s_flags & MS_RDONLY)) { | |
97 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
98 | ||
99 | if (!nilfs_test_opt(sbi, ERRORS_CONT)) | |
100 | nilfs_detach_segment_constructor(sbi); | |
101 | ||
102 | down_write(&nilfs->ns_sem); | |
103 | if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { | |
104 | nilfs->ns_mount_state |= NILFS_ERROR_FS; | |
e339ad31 RK |
105 | nilfs->ns_sbp[0]->s_state |= |
106 | cpu_to_le16(NILFS_ERROR_FS); | |
107 | nilfs_commit_super(sbi, 1); | |
783f6184 RK |
108 | } |
109 | up_write(&nilfs->ns_sem); | |
110 | ||
111 | if (nilfs_test_opt(sbi, ERRORS_RO)) { | |
112 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
113 | sb->s_flags |= MS_RDONLY; | |
114 | } | |
115 | } | |
116 | ||
117 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) | |
118 | panic("NILFS (device %s): panic forced after error\n", | |
119 | sb->s_id); | |
120 | } | |
121 | ||
122 | void nilfs_warning(struct super_block *sb, const char *function, | |
123 | const char *fmt, ...) | |
124 | { | |
125 | va_list args; | |
126 | ||
127 | va_start(args, fmt); | |
128 | printk(KERN_WARNING "NILFS warning (device %s): %s: ", | |
129 | sb->s_id, function); | |
130 | vprintk(fmt, args); | |
131 | printk("\n"); | |
132 | va_end(args); | |
133 | } | |
134 | ||
135 | static struct kmem_cache *nilfs_inode_cachep; | |
136 | ||
a53b4751 | 137 | struct inode *nilfs_alloc_inode_common(struct the_nilfs *nilfs) |
783f6184 RK |
138 | { |
139 | struct nilfs_inode_info *ii; | |
140 | ||
141 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); | |
142 | if (!ii) | |
143 | return NULL; | |
144 | ii->i_bh = NULL; | |
145 | ii->i_state = 0; | |
146 | ii->vfs_inode.i_version = 1; | |
a53b4751 | 147 | nilfs_btnode_cache_init(&ii->i_btnode_cache, nilfs->ns_bdi); |
783f6184 RK |
148 | return &ii->vfs_inode; |
149 | } | |
150 | ||
a53b4751 RK |
151 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
152 | { | |
153 | return nilfs_alloc_inode_common(NILFS_SB(sb)->s_nilfs); | |
154 | } | |
155 | ||
783f6184 RK |
156 | void nilfs_destroy_inode(struct inode *inode) |
157 | { | |
158 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); | |
159 | } | |
160 | ||
161 | static void init_once(void *obj) | |
162 | { | |
163 | struct nilfs_inode_info *ii = obj; | |
164 | ||
165 | INIT_LIST_HEAD(&ii->i_dirty); | |
166 | #ifdef CONFIG_NILFS_XATTR | |
167 | init_rwsem(&ii->xattr_sem); | |
168 | #endif | |
169 | nilfs_btnode_cache_init_once(&ii->i_btnode_cache); | |
170 | ii->i_bmap = (struct nilfs_bmap *)&ii->i_bmap_union; | |
171 | inode_init_once(&ii->vfs_inode); | |
172 | } | |
173 | ||
174 | static int nilfs_init_inode_cache(void) | |
175 | { | |
176 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
177 | sizeof(struct nilfs_inode_info), | |
178 | 0, SLAB_RECLAIM_ACCOUNT, | |
179 | init_once); | |
180 | ||
181 | return (nilfs_inode_cachep == NULL) ? -ENOMEM : 0; | |
182 | } | |
183 | ||
184 | static inline void nilfs_destroy_inode_cache(void) | |
185 | { | |
186 | kmem_cache_destroy(nilfs_inode_cachep); | |
187 | } | |
188 | ||
189 | static void nilfs_clear_inode(struct inode *inode) | |
190 | { | |
191 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
783f6184 | 192 | |
783f6184 RK |
193 | /* |
194 | * Free resources allocated in nilfs_read_inode(), here. | |
195 | */ | |
a2e7d2df | 196 | BUG_ON(!list_empty(&ii->i_dirty)); |
783f6184 RK |
197 | brelse(ii->i_bh); |
198 | ii->i_bh = NULL; | |
783f6184 RK |
199 | |
200 | if (test_bit(NILFS_I_BMAP, &ii->i_state)) | |
201 | nilfs_bmap_clear(ii->i_bmap); | |
202 | ||
203 | nilfs_btnode_cache_clear(&ii->i_btnode_cache); | |
783f6184 RK |
204 | } |
205 | ||
e339ad31 | 206 | static int nilfs_sync_super(struct nilfs_sb_info *sbi, int dupsb) |
783f6184 RK |
207 | { |
208 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
209 | int err; | |
210 | int barrier_done = 0; | |
211 | ||
212 | if (nilfs_test_opt(sbi, BARRIER)) { | |
e339ad31 | 213 | set_buffer_ordered(nilfs->ns_sbh[0]); |
783f6184 RK |
214 | barrier_done = 1; |
215 | } | |
216 | retry: | |
e339ad31 RK |
217 | set_buffer_dirty(nilfs->ns_sbh[0]); |
218 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); | |
783f6184 RK |
219 | if (err == -EOPNOTSUPP && barrier_done) { |
220 | nilfs_warning(sbi->s_super, __func__, | |
221 | "barrier-based sync failed. " | |
222 | "disabling barriers\n"); | |
223 | nilfs_clear_opt(sbi, BARRIER); | |
224 | barrier_done = 0; | |
e339ad31 | 225 | clear_buffer_ordered(nilfs->ns_sbh[0]); |
783f6184 RK |
226 | goto retry; |
227 | } | |
e339ad31 | 228 | if (unlikely(err)) { |
783f6184 RK |
229 | printk(KERN_ERR |
230 | "NILFS: unable to write superblock (err=%d)\n", err); | |
e339ad31 RK |
231 | if (err == -EIO && nilfs->ns_sbh[1]) { |
232 | nilfs_fall_back_super_block(nilfs); | |
233 | goto retry; | |
234 | } | |
235 | } else { | |
236 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; | |
237 | ||
238 | /* | |
239 | * The latest segment becomes trailable from the position | |
240 | * written in superblock. | |
241 | */ | |
783f6184 | 242 | clear_nilfs_discontinued(nilfs); |
e339ad31 RK |
243 | |
244 | /* update GC protection for recent segments */ | |
245 | if (nilfs->ns_sbh[1]) { | |
246 | sbp = NULL; | |
247 | if (dupsb) { | |
248 | set_buffer_dirty(nilfs->ns_sbh[1]); | |
249 | if (!sync_dirty_buffer(nilfs->ns_sbh[1])) | |
250 | sbp = nilfs->ns_sbp[1]; | |
251 | } | |
252 | } | |
253 | if (sbp) { | |
254 | spin_lock(&nilfs->ns_last_segment_lock); | |
255 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); | |
256 | spin_unlock(&nilfs->ns_last_segment_lock); | |
257 | } | |
783f6184 RK |
258 | } |
259 | ||
260 | return err; | |
261 | } | |
262 | ||
e339ad31 | 263 | int nilfs_commit_super(struct nilfs_sb_info *sbi, int dupsb) |
783f6184 RK |
264 | { |
265 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
e339ad31 | 266 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 267 | sector_t nfreeblocks; |
e339ad31 | 268 | time_t t; |
783f6184 RK |
269 | int err; |
270 | ||
271 | /* nilfs->sem must be locked by the caller. */ | |
e339ad31 RK |
272 | if (sbp[0]->s_magic != NILFS_SUPER_MAGIC) { |
273 | if (sbp[1] && sbp[1]->s_magic == NILFS_SUPER_MAGIC) | |
274 | nilfs_swap_super_block(nilfs); | |
275 | else { | |
276 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", | |
277 | sbi->s_super->s_id); | |
278 | return -EIO; | |
279 | } | |
280 | } | |
783f6184 RK |
281 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); |
282 | if (unlikely(err)) { | |
283 | printk(KERN_ERR "NILFS: failed to count free blocks\n"); | |
284 | return err; | |
285 | } | |
e339ad31 RK |
286 | spin_lock(&nilfs->ns_last_segment_lock); |
287 | sbp[0]->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
288 | sbp[0]->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
289 | sbp[0]->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
290 | spin_unlock(&nilfs->ns_last_segment_lock); | |
291 | ||
292 | t = get_seconds(); | |
293 | nilfs->ns_sbwtime[0] = t; | |
294 | sbp[0]->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
295 | sbp[0]->s_wtime = cpu_to_le64(t); | |
296 | sbp[0]->s_sum = 0; | |
297 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
298 | (unsigned char *)sbp[0], | |
299 | nilfs->ns_sbsize)); | |
300 | if (dupsb && sbp[1]) { | |
301 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
302 | nilfs->ns_sbwtime[1] = t; | |
303 | } | |
783f6184 | 304 | sbi->s_super->s_dirt = 0; |
e339ad31 | 305 | return nilfs_sync_super(sbi, dupsb); |
783f6184 RK |
306 | } |
307 | ||
308 | static void nilfs_put_super(struct super_block *sb) | |
309 | { | |
310 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
311 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
312 | ||
6cfd0148 CH |
313 | lock_kernel(); |
314 | ||
783f6184 RK |
315 | nilfs_detach_segment_constructor(sbi); |
316 | ||
317 | if (!(sb->s_flags & MS_RDONLY)) { | |
318 | down_write(&nilfs->ns_sem); | |
e339ad31 RK |
319 | nilfs->ns_sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state); |
320 | nilfs_commit_super(sbi, 1); | |
783f6184 RK |
321 | up_write(&nilfs->ns_sem); |
322 | } | |
e59399d0 | 323 | down_write(&nilfs->ns_super_sem); |
3f82ff55 RK |
324 | if (nilfs->ns_current == sbi) |
325 | nilfs->ns_current = NULL; | |
e59399d0 | 326 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
327 | |
328 | nilfs_detach_checkpoint(sbi); | |
329 | put_nilfs(sbi->s_nilfs); | |
330 | sbi->s_super = NULL; | |
331 | sb->s_fs_info = NULL; | |
6dd47406 | 332 | nilfs_put_sbinfo(sbi); |
6cfd0148 CH |
333 | |
334 | unlock_kernel(); | |
783f6184 RK |
335 | } |
336 | ||
783f6184 RK |
337 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
338 | { | |
6233caa9 JS |
339 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
340 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
783f6184 RK |
341 | int err = 0; |
342 | ||
343 | /* This function is called when super block should be written back */ | |
344 | if (wait) | |
345 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
346 | |
347 | down_write(&nilfs->ns_sem); | |
348 | if (sb->s_dirt) | |
349 | nilfs_commit_super(sbi, 1); | |
350 | up_write(&nilfs->ns_sem); | |
351 | ||
783f6184 RK |
352 | return err; |
353 | } | |
354 | ||
355 | int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno) | |
356 | { | |
357 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
358 | struct nilfs_checkpoint *raw_cp; | |
359 | struct buffer_head *bh_cp; | |
360 | int err; | |
361 | ||
e59399d0 | 362 | down_write(&nilfs->ns_super_sem); |
783f6184 | 363 | list_add(&sbi->s_list, &nilfs->ns_supers); |
e59399d0 | 364 | up_write(&nilfs->ns_super_sem); |
783f6184 | 365 | |
5731e191 | 366 | sbi->s_ifile = nilfs_mdt_new(nilfs, sbi->s_super, NILFS_IFILE_INO, 0); |
783f6184 RK |
367 | if (!sbi->s_ifile) |
368 | return -ENOMEM; | |
369 | ||
370 | err = nilfs_palloc_init_blockgroup(sbi->s_ifile, nilfs->ns_inode_size); | |
371 | if (unlikely(err)) | |
372 | goto failed; | |
373 | ||
1154ecbd | 374 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
375 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
376 | &bh_cp); | |
1154ecbd | 377 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
378 | if (unlikely(err)) { |
379 | if (err == -ENOENT || err == -EINVAL) { | |
380 | printk(KERN_ERR | |
381 | "NILFS: Invalid checkpoint " | |
382 | "(checkpoint number=%llu)\n", | |
383 | (unsigned long long)cno); | |
384 | err = -EINVAL; | |
385 | } | |
386 | goto failed; | |
387 | } | |
388 | err = nilfs_read_inode_common(sbi->s_ifile, &raw_cp->cp_ifile_inode); | |
389 | if (unlikely(err)) | |
390 | goto failed_bh; | |
391 | atomic_set(&sbi->s_inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); | |
392 | atomic_set(&sbi->s_blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); | |
393 | ||
394 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
395 | return 0; | |
396 | ||
397 | failed_bh: | |
398 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
399 | failed: | |
400 | nilfs_mdt_destroy(sbi->s_ifile); | |
401 | sbi->s_ifile = NULL; | |
402 | ||
e59399d0 | 403 | down_write(&nilfs->ns_super_sem); |
783f6184 | 404 | list_del_init(&sbi->s_list); |
e59399d0 | 405 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
406 | |
407 | return err; | |
408 | } | |
409 | ||
410 | void nilfs_detach_checkpoint(struct nilfs_sb_info *sbi) | |
411 | { | |
412 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
413 | ||
414 | nilfs_mdt_clear(sbi->s_ifile); | |
415 | nilfs_mdt_destroy(sbi->s_ifile); | |
416 | sbi->s_ifile = NULL; | |
e59399d0 | 417 | down_write(&nilfs->ns_super_sem); |
783f6184 | 418 | list_del_init(&sbi->s_list); |
e59399d0 | 419 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
420 | } |
421 | ||
422 | static int nilfs_mark_recovery_complete(struct nilfs_sb_info *sbi) | |
423 | { | |
424 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
425 | int err = 0; | |
426 | ||
427 | down_write(&nilfs->ns_sem); | |
428 | if (!(nilfs->ns_mount_state & NILFS_VALID_FS)) { | |
429 | nilfs->ns_mount_state |= NILFS_VALID_FS; | |
e339ad31 | 430 | err = nilfs_commit_super(sbi, 1); |
783f6184 RK |
431 | if (likely(!err)) |
432 | printk(KERN_INFO "NILFS: recovery complete.\n"); | |
433 | } | |
434 | up_write(&nilfs->ns_sem); | |
435 | return err; | |
436 | } | |
437 | ||
438 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
439 | { | |
440 | struct super_block *sb = dentry->d_sb; | |
441 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
c306af23 RK |
442 | struct the_nilfs *nilfs = sbi->s_nilfs; |
443 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
783f6184 RK |
444 | unsigned long long blocks; |
445 | unsigned long overhead; | |
446 | unsigned long nrsvblocks; | |
447 | sector_t nfreeblocks; | |
783f6184 RK |
448 | int err; |
449 | ||
450 | /* | |
451 | * Compute all of the segment blocks | |
452 | * | |
453 | * The blocks before first segment and after last segment | |
454 | * are excluded. | |
455 | */ | |
456 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
457 | - nilfs->ns_first_data_block; | |
458 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
459 | ||
460 | /* | |
461 | * Compute the overhead | |
462 | * | |
463 | * When distributing meta data blocks outside semgent structure, | |
464 | * We must count them as the overhead. | |
465 | */ | |
466 | overhead = 0; | |
467 | ||
468 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
469 | if (unlikely(err)) | |
470 | return err; | |
471 | ||
472 | buf->f_type = NILFS_SUPER_MAGIC; | |
473 | buf->f_bsize = sb->s_blocksize; | |
474 | buf->f_blocks = blocks - overhead; | |
475 | buf->f_bfree = nfreeblocks; | |
476 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
477 | (buf->f_bfree - nrsvblocks) : 0; | |
478 | buf->f_files = atomic_read(&sbi->s_inodes_count); | |
479 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ | |
480 | buf->f_namelen = NILFS_NAME_LEN; | |
c306af23 RK |
481 | buf->f_fsid.val[0] = (u32)id; |
482 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
483 | ||
783f6184 RK |
484 | return 0; |
485 | } | |
486 | ||
b58a285b JS |
487 | static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
488 | { | |
489 | struct super_block *sb = vfs->mnt_sb; | |
490 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
491 | ||
492 | if (!nilfs_test_opt(sbi, BARRIER)) | |
91f1953b | 493 | seq_printf(seq, ",nobarrier"); |
b58a285b JS |
494 | if (nilfs_test_opt(sbi, SNAPSHOT)) |
495 | seq_printf(seq, ",cp=%llu", | |
496 | (unsigned long long int)sbi->s_snapshot_cno); | |
497 | if (nilfs_test_opt(sbi, ERRORS_RO)) | |
498 | seq_printf(seq, ",errors=remount-ro"); | |
499 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) | |
500 | seq_printf(seq, ",errors=panic"); | |
501 | if (nilfs_test_opt(sbi, STRICT_ORDER)) | |
502 | seq_printf(seq, ",order=strict"); | |
503 | ||
504 | return 0; | |
505 | } | |
506 | ||
b87221de | 507 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
508 | .alloc_inode = nilfs_alloc_inode, |
509 | .destroy_inode = nilfs_destroy_inode, | |
510 | .dirty_inode = nilfs_dirty_inode, | |
511 | /* .write_inode = nilfs_write_inode, */ | |
512 | /* .put_inode = nilfs_put_inode, */ | |
513 | /* .drop_inode = nilfs_drop_inode, */ | |
514 | .delete_inode = nilfs_delete_inode, | |
515 | .put_super = nilfs_put_super, | |
1dfa2710 | 516 | /* .write_super = nilfs_write_super, */ |
783f6184 RK |
517 | .sync_fs = nilfs_sync_fs, |
518 | /* .write_super_lockfs */ | |
519 | /* .unlockfs */ | |
520 | .statfs = nilfs_statfs, | |
521 | .remount_fs = nilfs_remount, | |
522 | .clear_inode = nilfs_clear_inode, | |
523 | /* .umount_begin */ | |
b58a285b | 524 | .show_options = nilfs_show_options |
783f6184 RK |
525 | }; |
526 | ||
527 | static struct inode * | |
528 | nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation) | |
529 | { | |
530 | struct inode *inode; | |
531 | ||
532 | if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO && | |
533 | ino != NILFS_SKETCH_INO) | |
534 | return ERR_PTR(-ESTALE); | |
535 | ||
536 | inode = nilfs_iget(sb, ino); | |
537 | if (IS_ERR(inode)) | |
538 | return ERR_CAST(inode); | |
539 | if (generation && inode->i_generation != generation) { | |
540 | iput(inode); | |
541 | return ERR_PTR(-ESTALE); | |
542 | } | |
543 | ||
544 | return inode; | |
545 | } | |
546 | ||
547 | static struct dentry * | |
548 | nilfs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, | |
549 | int fh_type) | |
550 | { | |
551 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
552 | nilfs_nfs_get_inode); | |
553 | } | |
554 | ||
555 | static struct dentry * | |
556 | nilfs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, | |
557 | int fh_type) | |
558 | { | |
559 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
560 | nilfs_nfs_get_inode); | |
561 | } | |
562 | ||
ac4cfdd6 | 563 | static const struct export_operations nilfs_export_ops = { |
783f6184 RK |
564 | .fh_to_dentry = nilfs_fh_to_dentry, |
565 | .fh_to_parent = nilfs_fh_to_parent, | |
566 | .get_parent = nilfs_get_parent, | |
567 | }; | |
568 | ||
569 | enum { | |
570 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
91f1953b | 571 | Opt_nobarrier, Opt_snapshot, Opt_order, |
783f6184 RK |
572 | Opt_err, |
573 | }; | |
574 | ||
575 | static match_table_t tokens = { | |
576 | {Opt_err_cont, "errors=continue"}, | |
577 | {Opt_err_panic, "errors=panic"}, | |
578 | {Opt_err_ro, "errors=remount-ro"}, | |
91f1953b | 579 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
580 | {Opt_snapshot, "cp=%u"}, |
581 | {Opt_order, "order=%s"}, | |
582 | {Opt_err, NULL} | |
583 | }; | |
584 | ||
783f6184 RK |
585 | static int parse_options(char *options, struct super_block *sb) |
586 | { | |
587 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
588 | char *p; | |
589 | substring_t args[MAX_OPT_ARGS]; | |
590 | int option; | |
591 | ||
592 | if (!options) | |
593 | return 1; | |
594 | ||
595 | while ((p = strsep(&options, ",")) != NULL) { | |
596 | int token; | |
597 | if (!*p) | |
598 | continue; | |
599 | ||
600 | token = match_token(p, tokens, args); | |
601 | switch (token) { | |
91f1953b JS |
602 | case Opt_nobarrier: |
603 | nilfs_clear_opt(sbi, BARRIER); | |
783f6184 RK |
604 | break; |
605 | case Opt_order: | |
606 | if (strcmp(args[0].from, "relaxed") == 0) | |
607 | /* Ordered data semantics */ | |
608 | nilfs_clear_opt(sbi, STRICT_ORDER); | |
609 | else if (strcmp(args[0].from, "strict") == 0) | |
610 | /* Strict in-order semantics */ | |
611 | nilfs_set_opt(sbi, STRICT_ORDER); | |
612 | else | |
613 | return 0; | |
614 | break; | |
615 | case Opt_err_panic: | |
616 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC); | |
617 | break; | |
618 | case Opt_err_ro: | |
619 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO); | |
620 | break; | |
621 | case Opt_err_cont: | |
622 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT); | |
623 | break; | |
624 | case Opt_snapshot: | |
625 | if (match_int(&args[0], &option) || option <= 0) | |
626 | return 0; | |
627 | if (!(sb->s_flags & MS_RDONLY)) | |
628 | return 0; | |
629 | sbi->s_snapshot_cno = option; | |
630 | nilfs_set_opt(sbi, SNAPSHOT); | |
631 | break; | |
632 | default: | |
633 | printk(KERN_ERR | |
634 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
635 | return 0; | |
636 | } | |
637 | } | |
638 | return 1; | |
639 | } | |
640 | ||
641 | static inline void | |
642 | nilfs_set_default_options(struct nilfs_sb_info *sbi, | |
643 | struct nilfs_super_block *sbp) | |
644 | { | |
645 | sbi->s_mount_opt = | |
646 | NILFS_MOUNT_ERRORS_CONT | NILFS_MOUNT_BARRIER; | |
647 | } | |
648 | ||
649 | static int nilfs_setup_super(struct nilfs_sb_info *sbi) | |
650 | { | |
651 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
e339ad31 | 652 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; |
783f6184 RK |
653 | int max_mnt_count = le16_to_cpu(sbp->s_max_mnt_count); |
654 | int mnt_count = le16_to_cpu(sbp->s_mnt_count); | |
655 | ||
656 | /* nilfs->sem must be locked by the caller. */ | |
657 | if (!(nilfs->ns_mount_state & NILFS_VALID_FS)) { | |
658 | printk(KERN_WARNING "NILFS warning: mounting unchecked fs\n"); | |
659 | } else if (nilfs->ns_mount_state & NILFS_ERROR_FS) { | |
660 | printk(KERN_WARNING | |
661 | "NILFS warning: mounting fs with errors\n"); | |
662 | #if 0 | |
663 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
664 | printk(KERN_WARNING | |
665 | "NILFS warning: maximal mount count reached\n"); | |
666 | #endif | |
667 | } | |
668 | if (!max_mnt_count) | |
669 | sbp->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); | |
670 | ||
671 | sbp->s_mnt_count = cpu_to_le16(mnt_count + 1); | |
672 | sbp->s_state = cpu_to_le16(le16_to_cpu(sbp->s_state) & ~NILFS_VALID_FS); | |
673 | sbp->s_mtime = cpu_to_le64(get_seconds()); | |
e339ad31 | 674 | return nilfs_commit_super(sbi, 1); |
783f6184 RK |
675 | } |
676 | ||
e339ad31 RK |
677 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
678 | u64 pos, int blocksize, | |
679 | struct buffer_head **pbh) | |
783f6184 | 680 | { |
e339ad31 RK |
681 | unsigned long long sb_index = pos; |
682 | unsigned long offset; | |
783f6184 | 683 | |
e339ad31 | 684 | offset = do_div(sb_index, blocksize); |
783f6184 | 685 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 686 | if (!*pbh) |
783f6184 | 687 | return NULL; |
783f6184 RK |
688 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
689 | } | |
690 | ||
783f6184 RK |
691 | int nilfs_store_magic_and_option(struct super_block *sb, |
692 | struct nilfs_super_block *sbp, | |
693 | char *data) | |
694 | { | |
695 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
696 | ||
783f6184 RK |
697 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
698 | ||
699 | /* FS independent flags */ | |
700 | #ifdef NILFS_ATIME_DISABLE | |
701 | sb->s_flags |= MS_NOATIME; | |
702 | #endif | |
703 | ||
783f6184 RK |
704 | nilfs_set_default_options(sbi, sbp); |
705 | ||
706 | sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid); | |
707 | sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid); | |
708 | sbi->s_interval = le32_to_cpu(sbp->s_c_interval); | |
709 | sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max); | |
710 | ||
e339ad31 | 711 | return !parse_options(data, sb) ? -EINVAL : 0 ; |
783f6184 RK |
712 | } |
713 | ||
714 | /** | |
715 | * nilfs_fill_super() - initialize a super block instance | |
716 | * @sb: super_block | |
717 | * @data: mount options | |
718 | * @silent: silent mode flag | |
719 | * @nilfs: the_nilfs struct | |
720 | * | |
aa7dfb89 | 721 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
722 | * So, the recovery process is protected from other simultaneous mounts. |
723 | */ | |
724 | static int | |
725 | nilfs_fill_super(struct super_block *sb, void *data, int silent, | |
726 | struct the_nilfs *nilfs) | |
727 | { | |
728 | struct nilfs_sb_info *sbi; | |
729 | struct inode *root; | |
730 | __u64 cno; | |
731 | int err; | |
732 | ||
733 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
734 | if (!sbi) | |
735 | return -ENOMEM; | |
736 | ||
737 | sb->s_fs_info = sbi; | |
738 | ||
739 | get_nilfs(nilfs); | |
740 | sbi->s_nilfs = nilfs; | |
741 | sbi->s_super = sb; | |
6dd47406 | 742 | atomic_set(&sbi->s_count, 1); |
783f6184 RK |
743 | |
744 | err = init_nilfs(nilfs, sbi, (char *)data); | |
745 | if (err) | |
746 | goto failed_sbi; | |
747 | ||
748 | spin_lock_init(&sbi->s_inode_lock); | |
749 | INIT_LIST_HEAD(&sbi->s_dirty_files); | |
750 | INIT_LIST_HEAD(&sbi->s_list); | |
751 | ||
752 | /* | |
753 | * Following initialization is overlapped because | |
754 | * nilfs_sb_info structure has been cleared at the beginning. | |
755 | * But we reserve them to keep our interest and make ready | |
756 | * for the future change. | |
757 | */ | |
758 | get_random_bytes(&sbi->s_next_generation, | |
759 | sizeof(sbi->s_next_generation)); | |
760 | spin_lock_init(&sbi->s_next_gen_lock); | |
761 | ||
762 | sb->s_op = &nilfs_sops; | |
763 | sb->s_export_op = &nilfs_export_ops; | |
764 | sb->s_root = NULL; | |
61239230 | 765 | sb->s_time_gran = 1; |
783f6184 RK |
766 | |
767 | if (!nilfs_loaded(nilfs)) { | |
768 | err = load_nilfs(nilfs, sbi); | |
769 | if (err) | |
770 | goto failed_sbi; | |
771 | } | |
772 | cno = nilfs_last_cno(nilfs); | |
773 | ||
774 | if (sb->s_flags & MS_RDONLY) { | |
775 | if (nilfs_test_opt(sbi, SNAPSHOT)) { | |
43be0ec0 | 776 | down_read(&nilfs->ns_segctor_sem); |
1f5abe7e RK |
777 | err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, |
778 | sbi->s_snapshot_cno); | |
43be0ec0 ZY |
779 | up_read(&nilfs->ns_segctor_sem); |
780 | if (err < 0) { | |
781 | if (err == -ENOENT) | |
782 | err = -EINVAL; | |
1f5abe7e | 783 | goto failed_sbi; |
43be0ec0 | 784 | } |
1f5abe7e | 785 | if (!err) { |
783f6184 RK |
786 | printk(KERN_ERR |
787 | "NILFS: The specified checkpoint is " | |
788 | "not a snapshot " | |
789 | "(checkpoint number=%llu).\n", | |
790 | (unsigned long long)sbi->s_snapshot_cno); | |
791 | err = -EINVAL; | |
792 | goto failed_sbi; | |
793 | } | |
794 | cno = sbi->s_snapshot_cno; | |
795 | } else | |
796 | /* Read-only mount */ | |
797 | sbi->s_snapshot_cno = cno; | |
798 | } | |
799 | ||
800 | err = nilfs_attach_checkpoint(sbi, cno); | |
801 | if (err) { | |
802 | printk(KERN_ERR "NILFS: error loading a checkpoint" | |
803 | " (checkpoint number=%llu).\n", (unsigned long long)cno); | |
804 | goto failed_sbi; | |
805 | } | |
806 | ||
807 | if (!(sb->s_flags & MS_RDONLY)) { | |
cece5520 | 808 | err = nilfs_attach_segment_constructor(sbi); |
783f6184 RK |
809 | if (err) |
810 | goto failed_checkpoint; | |
811 | } | |
812 | ||
813 | root = nilfs_iget(sb, NILFS_ROOT_INO); | |
814 | if (IS_ERR(root)) { | |
815 | printk(KERN_ERR "NILFS: get root inode failed\n"); | |
816 | err = PTR_ERR(root); | |
817 | goto failed_segctor; | |
818 | } | |
819 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
820 | iput(root); | |
821 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); | |
822 | err = -EINVAL; | |
823 | goto failed_segctor; | |
824 | } | |
825 | sb->s_root = d_alloc_root(root); | |
826 | if (!sb->s_root) { | |
827 | iput(root); | |
828 | printk(KERN_ERR "NILFS: get root dentry failed\n"); | |
829 | err = -ENOMEM; | |
830 | goto failed_segctor; | |
831 | } | |
832 | ||
833 | if (!(sb->s_flags & MS_RDONLY)) { | |
834 | down_write(&nilfs->ns_sem); | |
835 | nilfs_setup_super(sbi); | |
836 | up_write(&nilfs->ns_sem); | |
837 | } | |
838 | ||
839 | err = nilfs_mark_recovery_complete(sbi); | |
840 | if (unlikely(err)) { | |
841 | printk(KERN_ERR "NILFS: recovery failed.\n"); | |
842 | goto failed_root; | |
843 | } | |
844 | ||
e59399d0 | 845 | down_write(&nilfs->ns_super_sem); |
3f82ff55 RK |
846 | if (!nilfs_test_opt(sbi, SNAPSHOT)) |
847 | nilfs->ns_current = sbi; | |
e59399d0 | 848 | up_write(&nilfs->ns_super_sem); |
3f82ff55 | 849 | |
783f6184 RK |
850 | return 0; |
851 | ||
852 | failed_root: | |
853 | dput(sb->s_root); | |
854 | sb->s_root = NULL; | |
855 | ||
856 | failed_segctor: | |
857 | nilfs_detach_segment_constructor(sbi); | |
858 | ||
859 | failed_checkpoint: | |
860 | nilfs_detach_checkpoint(sbi); | |
861 | ||
862 | failed_sbi: | |
863 | put_nilfs(nilfs); | |
864 | sb->s_fs_info = NULL; | |
6dd47406 | 865 | nilfs_put_sbinfo(sbi); |
783f6184 RK |
866 | return err; |
867 | } | |
868 | ||
869 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
870 | { | |
871 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
872 | struct nilfs_super_block *sbp; | |
873 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
874 | unsigned long old_sb_flags; | |
875 | struct nilfs_mount_options old_opts; | |
876 | int err; | |
877 | ||
337eb00a AIB |
878 | lock_kernel(); |
879 | ||
e59399d0 | 880 | down_write(&nilfs->ns_super_sem); |
783f6184 RK |
881 | old_sb_flags = sb->s_flags; |
882 | old_opts.mount_opt = sbi->s_mount_opt; | |
883 | old_opts.snapshot_cno = sbi->s_snapshot_cno; | |
884 | ||
885 | if (!parse_options(data, sb)) { | |
886 | err = -EINVAL; | |
887 | goto restore_opts; | |
888 | } | |
889 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); | |
890 | ||
891 | if ((*flags & MS_RDONLY) && | |
892 | sbi->s_snapshot_cno != old_opts.snapshot_cno) { | |
893 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
894 | "remount to a different snapshot. \n", | |
895 | sb->s_id); | |
896 | err = -EINVAL; | |
897 | goto restore_opts; | |
898 | } | |
899 | ||
900 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) | |
901 | goto out; | |
902 | if (*flags & MS_RDONLY) { | |
903 | /* Shutting down the segment constructor */ | |
904 | nilfs_detach_segment_constructor(sbi); | |
905 | sb->s_flags |= MS_RDONLY; | |
906 | ||
907 | sbi->s_snapshot_cno = nilfs_last_cno(nilfs); | |
908 | /* nilfs_set_opt(sbi, SNAPSHOT); */ | |
909 | ||
910 | /* | |
911 | * Remounting a valid RW partition RDONLY, so set | |
912 | * the RDONLY flag and then mark the partition as valid again. | |
913 | */ | |
914 | down_write(&nilfs->ns_sem); | |
e339ad31 | 915 | sbp = nilfs->ns_sbp[0]; |
783f6184 RK |
916 | if (!(sbp->s_state & le16_to_cpu(NILFS_VALID_FS)) && |
917 | (nilfs->ns_mount_state & NILFS_VALID_FS)) | |
918 | sbp->s_state = cpu_to_le16(nilfs->ns_mount_state); | |
919 | sbp->s_mtime = cpu_to_le64(get_seconds()); | |
e339ad31 | 920 | nilfs_commit_super(sbi, 1); |
783f6184 RK |
921 | up_write(&nilfs->ns_sem); |
922 | } else { | |
923 | /* | |
924 | * Mounting a RDONLY partition read-write, so reread and | |
925 | * store the current valid flag. (It may have been changed | |
926 | * by fsck since we originally mounted the partition.) | |
927 | */ | |
3f82ff55 | 928 | if (nilfs->ns_current && nilfs->ns_current != sbi) { |
783f6184 | 929 | printk(KERN_WARNING "NILFS (device %s): couldn't " |
3f82ff55 | 930 | "remount because an RW-mount exists.\n", |
783f6184 RK |
931 | sb->s_id); |
932 | err = -EBUSY; | |
e59399d0 | 933 | goto restore_opts; |
783f6184 RK |
934 | } |
935 | if (sbi->s_snapshot_cno != nilfs_last_cno(nilfs)) { | |
936 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
937 | "remount because the current RO-mount is not " | |
938 | "the latest one.\n", | |
939 | sb->s_id); | |
940 | err = -EINVAL; | |
e59399d0 | 941 | goto restore_opts; |
783f6184 RK |
942 | } |
943 | sb->s_flags &= ~MS_RDONLY; | |
944 | nilfs_clear_opt(sbi, SNAPSHOT); | |
945 | sbi->s_snapshot_cno = 0; | |
946 | ||
cece5520 | 947 | err = nilfs_attach_segment_constructor(sbi); |
783f6184 | 948 | if (err) |
e59399d0 | 949 | goto restore_opts; |
783f6184 RK |
950 | |
951 | down_write(&nilfs->ns_sem); | |
952 | nilfs_setup_super(sbi); | |
953 | up_write(&nilfs->ns_sem); | |
954 | ||
e59399d0 | 955 | nilfs->ns_current = sbi; |
783f6184 RK |
956 | } |
957 | out: | |
e59399d0 | 958 | up_write(&nilfs->ns_super_sem); |
337eb00a | 959 | unlock_kernel(); |
783f6184 RK |
960 | return 0; |
961 | ||
783f6184 RK |
962 | restore_opts: |
963 | sb->s_flags = old_sb_flags; | |
964 | sbi->s_mount_opt = old_opts.mount_opt; | |
965 | sbi->s_snapshot_cno = old_opts.snapshot_cno; | |
e59399d0 | 966 | up_write(&nilfs->ns_super_sem); |
337eb00a | 967 | unlock_kernel(); |
783f6184 RK |
968 | return err; |
969 | } | |
970 | ||
971 | struct nilfs_super_data { | |
972 | struct block_device *bdev; | |
6dd47406 | 973 | struct nilfs_sb_info *sbi; |
783f6184 RK |
974 | __u64 cno; |
975 | int flags; | |
976 | }; | |
977 | ||
978 | /** | |
979 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
980 | * @data: mount options | |
981 | * @sd: nilfs_super_data | |
982 | */ | |
983 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
984 | { | |
985 | char *p, *options = data; | |
986 | substring_t args[MAX_OPT_ARGS]; | |
987 | int option, token; | |
988 | int ret = 0; | |
989 | ||
990 | do { | |
991 | p = strsep(&options, ","); | |
992 | if (p != NULL && *p) { | |
993 | token = match_token(p, tokens, args); | |
994 | if (token == Opt_snapshot) { | |
995 | if (!(sd->flags & MS_RDONLY)) | |
996 | ret++; | |
997 | else { | |
998 | ret = match_int(&args[0], &option); | |
999 | if (!ret) { | |
1000 | if (option > 0) | |
1001 | sd->cno = option; | |
1002 | else | |
1003 | ret++; | |
1004 | } | |
1005 | } | |
1006 | } | |
1007 | if (ret) | |
1008 | printk(KERN_ERR | |
1009 | "NILFS: invalid mount option: %s\n", p); | |
1010 | } | |
1011 | if (!options) | |
1012 | break; | |
1013 | BUG_ON(options == data); | |
1014 | *(options - 1) = ','; | |
1015 | } while (!ret); | |
1016 | return ret; | |
1017 | } | |
1018 | ||
1019 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1020 | { | |
1021 | struct nilfs_super_data *sd = data; | |
1022 | ||
1023 | s->s_bdev = sd->bdev; | |
1024 | s->s_dev = s->s_bdev->bd_dev; | |
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 RK |
1029 | { |
1030 | struct nilfs_super_data *sd = data; | |
6dd47406 RK |
1031 | |
1032 | return sd->sbi && s->s_fs_info == (void *)sd->sbi; | |
783f6184 RK |
1033 | } |
1034 | ||
1035 | static int | |
1036 | nilfs_get_sb(struct file_system_type *fs_type, int flags, | |
1037 | const char *dev_name, void *data, struct vfsmount *mnt) | |
1038 | { | |
1039 | struct nilfs_super_data sd; | |
33c8e57c RK |
1040 | struct super_block *s; |
1041 | struct the_nilfs *nilfs; | |
783f6184 RK |
1042 | int err, need_to_close = 1; |
1043 | ||
1044 | sd.bdev = open_bdev_exclusive(dev_name, flags, fs_type); | |
1045 | if (IS_ERR(sd.bdev)) | |
1046 | return PTR_ERR(sd.bdev); | |
1047 | ||
1048 | /* | |
1049 | * To get mount instance using sget() vfs-routine, NILFS needs | |
1050 | * much more information than normal filesystems to identify mount | |
1051 | * instance. For snapshot mounts, not only a mount type (ro-mount | |
1052 | * or rw-mount) but also a checkpoint number is required. | |
783f6184 RK |
1053 | */ |
1054 | sd.cno = 0; | |
1055 | sd.flags = flags; | |
1056 | if (nilfs_identify((char *)data, &sd)) { | |
1057 | err = -EINVAL; | |
1058 | goto failed; | |
1059 | } | |
1060 | ||
33c8e57c RK |
1061 | nilfs = find_or_create_nilfs(sd.bdev); |
1062 | if (!nilfs) { | |
1063 | err = -ENOMEM; | |
1064 | goto failed; | |
1065 | } | |
1066 | ||
aa7dfb89 | 1067 | mutex_lock(&nilfs->ns_mount_mutex); |
3f82ff55 RK |
1068 | |
1069 | if (!sd.cno) { | |
1070 | /* | |
1071 | * Check if an exclusive mount exists or not. | |
1072 | * Snapshot mounts coexist with a current mount | |
1073 | * (i.e. rw-mount or ro-mount), whereas rw-mount and | |
1074 | * ro-mount are mutually exclusive. | |
1075 | */ | |
e59399d0 | 1076 | down_read(&nilfs->ns_super_sem); |
3f82ff55 RK |
1077 | if (nilfs->ns_current && |
1078 | ((nilfs->ns_current->s_super->s_flags ^ flags) | |
1079 | & MS_RDONLY)) { | |
e59399d0 | 1080 | up_read(&nilfs->ns_super_sem); |
3f82ff55 RK |
1081 | err = -EBUSY; |
1082 | goto failed_unlock; | |
1083 | } | |
e59399d0 | 1084 | up_read(&nilfs->ns_super_sem); |
783f6184 RK |
1085 | } |
1086 | ||
1087 | /* | |
6dd47406 | 1088 | * Find existing nilfs_sb_info struct |
783f6184 | 1089 | */ |
6dd47406 RK |
1090 | sd.sbi = nilfs_find_sbinfo(nilfs, !(flags & MS_RDONLY), sd.cno); |
1091 | ||
6dd47406 RK |
1092 | /* |
1093 | * Get super block instance holding the nilfs_sb_info struct. | |
1094 | * A new instance is allocated if no existing mount is present or | |
1095 | * existing instance has been unmounted. | |
1096 | */ | |
33c8e57c | 1097 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, &sd); |
6dd47406 RK |
1098 | if (sd.sbi) |
1099 | nilfs_put_sbinfo(sd.sbi); | |
1100 | ||
33c8e57c RK |
1101 | if (IS_ERR(s)) { |
1102 | err = PTR_ERR(s); | |
1103 | goto failed_unlock; | |
783f6184 RK |
1104 | } |
1105 | ||
1106 | if (!s->s_root) { | |
1107 | char b[BDEVNAME_SIZE]; | |
1108 | ||
33c8e57c | 1109 | /* New superblock instance created */ |
783f6184 RK |
1110 | s->s_flags = flags; |
1111 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); | |
1112 | sb_set_blocksize(s, block_size(sd.bdev)); | |
1113 | ||
1114 | err = nilfs_fill_super(s, data, flags & MS_VERBOSE, nilfs); | |
1115 | if (err) | |
1116 | goto cancel_new; | |
1117 | ||
1118 | s->s_flags |= MS_ACTIVE; | |
1119 | need_to_close = 0; | |
783f6184 RK |
1120 | } |
1121 | ||
aa7dfb89 | 1122 | mutex_unlock(&nilfs->ns_mount_mutex); |
783f6184 RK |
1123 | put_nilfs(nilfs); |
1124 | if (need_to_close) | |
1125 | close_bdev_exclusive(sd.bdev, flags); | |
1126 | simple_set_mnt(mnt, s); | |
1127 | return 0; | |
1128 | ||
783f6184 | 1129 | failed_unlock: |
aa7dfb89 | 1130 | mutex_unlock(&nilfs->ns_mount_mutex); |
33c8e57c | 1131 | put_nilfs(nilfs); |
783f6184 RK |
1132 | failed: |
1133 | close_bdev_exclusive(sd.bdev, flags); | |
1134 | ||
1135 | return err; | |
1136 | ||
1137 | cancel_new: | |
1138 | /* Abandoning the newly allocated superblock */ | |
aa7dfb89 | 1139 | mutex_unlock(&nilfs->ns_mount_mutex); |
33c8e57c | 1140 | put_nilfs(nilfs); |
783f6184 RK |
1141 | up_write(&s->s_umount); |
1142 | deactivate_super(s); | |
1143 | /* | |
1144 | * deactivate_super() invokes close_bdev_exclusive(). | |
1145 | * We must finish all post-cleaning before this call; | |
aa7dfb89 | 1146 | * put_nilfs() needs the block device. |
783f6184 RK |
1147 | */ |
1148 | return err; | |
1149 | } | |
1150 | ||
783f6184 RK |
1151 | struct file_system_type nilfs_fs_type = { |
1152 | .owner = THIS_MODULE, | |
1153 | .name = "nilfs2", | |
1154 | .get_sb = nilfs_get_sb, | |
1155 | .kill_sb = kill_block_super, | |
1156 | .fs_flags = FS_REQUIRES_DEV, | |
1157 | }; | |
1158 | ||
1159 | static int __init init_nilfs_fs(void) | |
1160 | { | |
1161 | int err; | |
1162 | ||
1163 | err = nilfs_init_inode_cache(); | |
1164 | if (err) | |
1165 | goto failed; | |
1166 | ||
1167 | err = nilfs_init_transaction_cache(); | |
1168 | if (err) | |
1169 | goto failed_inode_cache; | |
1170 | ||
1171 | err = nilfs_init_segbuf_cache(); | |
1172 | if (err) | |
1173 | goto failed_transaction_cache; | |
1174 | ||
1175 | err = nilfs_btree_path_cache_init(); | |
1176 | if (err) | |
1177 | goto failed_segbuf_cache; | |
1178 | ||
1179 | err = register_filesystem(&nilfs_fs_type); | |
1180 | if (err) | |
1181 | goto failed_btree_path_cache; | |
1182 | ||
1183 | return 0; | |
1184 | ||
1185 | failed_btree_path_cache: | |
1186 | nilfs_btree_path_cache_destroy(); | |
1187 | ||
1188 | failed_segbuf_cache: | |
1189 | nilfs_destroy_segbuf_cache(); | |
1190 | ||
1191 | failed_transaction_cache: | |
1192 | nilfs_destroy_transaction_cache(); | |
1193 | ||
1194 | failed_inode_cache: | |
1195 | nilfs_destroy_inode_cache(); | |
1196 | ||
1197 | failed: | |
1198 | return err; | |
1199 | } | |
1200 | ||
1201 | static void __exit exit_nilfs_fs(void) | |
1202 | { | |
1203 | nilfs_destroy_segbuf_cache(); | |
1204 | nilfs_destroy_transaction_cache(); | |
1205 | nilfs_destroy_inode_cache(); | |
1206 | nilfs_btree_path_cache_destroy(); | |
1207 | unregister_filesystem(&nilfs_fs_type); | |
1208 | } | |
1209 | ||
1210 | module_init(init_nilfs_fs) | |
1211 | module_exit(exit_nilfs_fs) |