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