Commit | Line | Data |
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783f6184 RK |
1 | /* |
2 | * super.c - NILFS module and super block management. | |
3 | * | |
4 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | * | |
20 | * Written by Ryusuke Konishi <ryusuke@osrg.net> | |
21 | */ | |
22 | /* | |
23 | * linux/fs/ext2/super.c | |
24 | * | |
25 | * Copyright (C) 1992, 1993, 1994, 1995 | |
26 | * Remy Card (card@masi.ibp.fr) | |
27 | * Laboratoire MASI - Institut Blaise Pascal | |
28 | * Universite Pierre et Marie Curie (Paris VI) | |
29 | * | |
30 | * from | |
31 | * | |
32 | * linux/fs/minix/inode.c | |
33 | * | |
34 | * Copyright (C) 1991, 1992 Linus Torvalds | |
35 | * | |
36 | * Big-endian to little-endian byte-swapping/bitmaps by | |
37 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
38 | */ | |
39 | ||
40 | #include <linux/module.h> | |
41 | #include <linux/string.h> | |
42 | #include <linux/slab.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/blkdev.h> | |
45 | #include <linux/parser.h> | |
46 | #include <linux/random.h> | |
47 | #include <linux/crc32.h> | |
48 | #include <linux/smp_lock.h> | |
49 | #include <linux/vfs.h> | |
50 | #include <linux/writeback.h> | |
51 | #include <linux/kobject.h> | |
52 | #include <linux/exportfs.h> | |
b58a285b JS |
53 | #include <linux/seq_file.h> |
54 | #include <linux/mount.h> | |
783f6184 RK |
55 | #include "nilfs.h" |
56 | #include "mdt.h" | |
57 | #include "alloc.h" | |
58 | #include "page.h" | |
59 | #include "cpfile.h" | |
60 | #include "ifile.h" | |
61 | #include "dat.h" | |
62 | #include "segment.h" | |
63 | #include "segbuf.h" | |
64 | ||
65 | MODULE_AUTHOR("NTT Corp."); | |
66 | MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem " | |
67 | "(NILFS)"); | |
783f6184 RK |
68 | MODULE_LICENSE("GPL"); |
69 | ||
41c88bd7 LH |
70 | struct kmem_cache *nilfs_inode_cachep; |
71 | struct kmem_cache *nilfs_transaction_cachep; | |
72 | struct kmem_cache *nilfs_segbuf_cachep; | |
73 | struct kmem_cache *nilfs_btree_path_cache; | |
74 | ||
783f6184 | 75 | static int nilfs_remount(struct super_block *sb, int *flags, char *data); |
783f6184 | 76 | |
c8a11c8a RK |
77 | static void nilfs_set_error(struct nilfs_sb_info *sbi) |
78 | { | |
79 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
80 | ||
81 | down_write(&nilfs->ns_sem); | |
82 | if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { | |
83 | nilfs->ns_mount_state |= NILFS_ERROR_FS; | |
84 | nilfs->ns_sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
85 | nilfs_commit_super(sbi, 1); | |
86 | } | |
87 | up_write(&nilfs->ns_sem); | |
88 | } | |
89 | ||
783f6184 RK |
90 | /** |
91 | * nilfs_error() - report failure condition on a filesystem | |
92 | * | |
93 | * nilfs_error() sets an ERROR_FS flag on the superblock as well as | |
94 | * reporting an error message. It should be called when NILFS detects | |
95 | * incoherences or defects of meta data on disk. As for sustainable | |
96 | * errors such as a single-shot I/O error, nilfs_warning() or the printk() | |
97 | * function should be used instead. | |
98 | * | |
99 | * The segment constructor must not call this function because it can | |
100 | * kill itself. | |
101 | */ | |
102 | void nilfs_error(struct super_block *sb, const char *function, | |
103 | const char *fmt, ...) | |
104 | { | |
105 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
106 | va_list args; | |
107 | ||
108 | va_start(args, fmt); | |
109 | printk(KERN_CRIT "NILFS error (device %s): %s: ", sb->s_id, function); | |
110 | vprintk(fmt, args); | |
111 | printk("\n"); | |
112 | va_end(args); | |
113 | ||
114 | if (!(sb->s_flags & MS_RDONLY)) { | |
c8a11c8a | 115 | nilfs_set_error(sbi); |
783f6184 RK |
116 | |
117 | if (nilfs_test_opt(sbi, ERRORS_RO)) { | |
118 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
119 | sb->s_flags |= MS_RDONLY; | |
120 | } | |
121 | } | |
122 | ||
123 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) | |
124 | panic("NILFS (device %s): panic forced after error\n", | |
125 | sb->s_id); | |
126 | } | |
127 | ||
128 | void nilfs_warning(struct super_block *sb, const char *function, | |
129 | const char *fmt, ...) | |
130 | { | |
131 | va_list args; | |
132 | ||
133 | va_start(args, fmt); | |
134 | printk(KERN_WARNING "NILFS warning (device %s): %s: ", | |
135 | sb->s_id, function); | |
136 | vprintk(fmt, args); | |
137 | printk("\n"); | |
138 | va_end(args); | |
139 | } | |
140 | ||
783f6184 | 141 | |
a53b4751 | 142 | struct inode *nilfs_alloc_inode_common(struct the_nilfs *nilfs) |
783f6184 RK |
143 | { |
144 | struct nilfs_inode_info *ii; | |
145 | ||
146 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); | |
147 | if (!ii) | |
148 | return NULL; | |
149 | ii->i_bh = NULL; | |
150 | ii->i_state = 0; | |
151 | ii->vfs_inode.i_version = 1; | |
a53b4751 | 152 | nilfs_btnode_cache_init(&ii->i_btnode_cache, nilfs->ns_bdi); |
783f6184 RK |
153 | return &ii->vfs_inode; |
154 | } | |
155 | ||
a53b4751 RK |
156 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
157 | { | |
158 | return nilfs_alloc_inode_common(NILFS_SB(sb)->s_nilfs); | |
159 | } | |
160 | ||
783f6184 RK |
161 | void nilfs_destroy_inode(struct inode *inode) |
162 | { | |
163 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); | |
164 | } | |
165 | ||
783f6184 RK |
166 | static void nilfs_clear_inode(struct inode *inode) |
167 | { | |
168 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
783f6184 | 169 | |
783f6184 RK |
170 | /* |
171 | * Free resources allocated in nilfs_read_inode(), here. | |
172 | */ | |
a2e7d2df | 173 | BUG_ON(!list_empty(&ii->i_dirty)); |
783f6184 RK |
174 | brelse(ii->i_bh); |
175 | ii->i_bh = NULL; | |
783f6184 RK |
176 | |
177 | if (test_bit(NILFS_I_BMAP, &ii->i_state)) | |
178 | nilfs_bmap_clear(ii->i_bmap); | |
179 | ||
180 | nilfs_btnode_cache_clear(&ii->i_btnode_cache); | |
783f6184 RK |
181 | } |
182 | ||
e339ad31 | 183 | static int nilfs_sync_super(struct nilfs_sb_info *sbi, int dupsb) |
783f6184 RK |
184 | { |
185 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
186 | int err; | |
187 | int barrier_done = 0; | |
188 | ||
189 | if (nilfs_test_opt(sbi, BARRIER)) { | |
e339ad31 | 190 | set_buffer_ordered(nilfs->ns_sbh[0]); |
783f6184 RK |
191 | barrier_done = 1; |
192 | } | |
193 | retry: | |
e339ad31 RK |
194 | set_buffer_dirty(nilfs->ns_sbh[0]); |
195 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); | |
783f6184 RK |
196 | if (err == -EOPNOTSUPP && barrier_done) { |
197 | nilfs_warning(sbi->s_super, __func__, | |
198 | "barrier-based sync failed. " | |
199 | "disabling barriers\n"); | |
200 | nilfs_clear_opt(sbi, BARRIER); | |
201 | barrier_done = 0; | |
e339ad31 | 202 | clear_buffer_ordered(nilfs->ns_sbh[0]); |
783f6184 RK |
203 | goto retry; |
204 | } | |
e339ad31 | 205 | if (unlikely(err)) { |
783f6184 RK |
206 | printk(KERN_ERR |
207 | "NILFS: unable to write superblock (err=%d)\n", err); | |
e339ad31 RK |
208 | if (err == -EIO && nilfs->ns_sbh[1]) { |
209 | nilfs_fall_back_super_block(nilfs); | |
210 | goto retry; | |
211 | } | |
212 | } else { | |
213 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; | |
214 | ||
215 | /* | |
216 | * The latest segment becomes trailable from the position | |
217 | * written in superblock. | |
218 | */ | |
783f6184 | 219 | clear_nilfs_discontinued(nilfs); |
e339ad31 RK |
220 | |
221 | /* update GC protection for recent segments */ | |
222 | if (nilfs->ns_sbh[1]) { | |
223 | sbp = NULL; | |
224 | if (dupsb) { | |
225 | set_buffer_dirty(nilfs->ns_sbh[1]); | |
226 | if (!sync_dirty_buffer(nilfs->ns_sbh[1])) | |
227 | sbp = nilfs->ns_sbp[1]; | |
228 | } | |
229 | } | |
230 | if (sbp) { | |
231 | spin_lock(&nilfs->ns_last_segment_lock); | |
232 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); | |
233 | spin_unlock(&nilfs->ns_last_segment_lock); | |
234 | } | |
783f6184 RK |
235 | } |
236 | ||
237 | return err; | |
238 | } | |
239 | ||
e339ad31 | 240 | int nilfs_commit_super(struct nilfs_sb_info *sbi, int dupsb) |
783f6184 RK |
241 | { |
242 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
e339ad31 | 243 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 244 | sector_t nfreeblocks; |
e339ad31 | 245 | time_t t; |
783f6184 RK |
246 | int err; |
247 | ||
248 | /* nilfs->sem must be locked by the caller. */ | |
34cb9b5c RK |
249 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
250 | if (sbp[1] && sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) | |
e339ad31 RK |
251 | nilfs_swap_super_block(nilfs); |
252 | else { | |
253 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", | |
254 | sbi->s_super->s_id); | |
255 | return -EIO; | |
256 | } | |
257 | } | |
783f6184 RK |
258 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); |
259 | if (unlikely(err)) { | |
260 | printk(KERN_ERR "NILFS: failed to count free blocks\n"); | |
261 | return err; | |
262 | } | |
e339ad31 RK |
263 | spin_lock(&nilfs->ns_last_segment_lock); |
264 | sbp[0]->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
265 | sbp[0]->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
266 | sbp[0]->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
267 | spin_unlock(&nilfs->ns_last_segment_lock); | |
268 | ||
269 | t = get_seconds(); | |
270 | nilfs->ns_sbwtime[0] = t; | |
271 | sbp[0]->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
272 | sbp[0]->s_wtime = cpu_to_le64(t); | |
273 | sbp[0]->s_sum = 0; | |
274 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
275 | (unsigned char *)sbp[0], | |
276 | nilfs->ns_sbsize)); | |
277 | if (dupsb && sbp[1]) { | |
278 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
279 | nilfs->ns_sbwtime[1] = t; | |
280 | } | |
e605f0a7 | 281 | clear_nilfs_sb_dirty(nilfs); |
e339ad31 | 282 | return nilfs_sync_super(sbi, dupsb); |
783f6184 RK |
283 | } |
284 | ||
7ecaa46c RK |
285 | /** |
286 | * nilfs_cleanup_super() - write filesystem state for cleanup | |
287 | * @sbi: nilfs_sb_info to be unmounted or degraded to read-only | |
288 | * | |
289 | * This function restores state flags in the on-disk super block. | |
290 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the | |
291 | * filesystem was not clean previously. | |
292 | */ | |
293 | int nilfs_cleanup_super(struct nilfs_sb_info *sbi) | |
294 | { | |
295 | struct nilfs_super_block **sbp = sbi->s_nilfs->ns_sbp; | |
296 | int ret; | |
297 | ||
298 | sbp[0]->s_state = cpu_to_le16(sbi->s_nilfs->ns_mount_state); | |
299 | ret = nilfs_commit_super(sbi, 1); | |
300 | return ret; | |
301 | } | |
302 | ||
783f6184 RK |
303 | static void nilfs_put_super(struct super_block *sb) |
304 | { | |
305 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
306 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
307 | ||
6cfd0148 CH |
308 | lock_kernel(); |
309 | ||
783f6184 RK |
310 | nilfs_detach_segment_constructor(sbi); |
311 | ||
312 | if (!(sb->s_flags & MS_RDONLY)) { | |
313 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 314 | nilfs_cleanup_super(sbi); |
783f6184 RK |
315 | up_write(&nilfs->ns_sem); |
316 | } | |
e59399d0 | 317 | down_write(&nilfs->ns_super_sem); |
3f82ff55 RK |
318 | if (nilfs->ns_current == sbi) |
319 | nilfs->ns_current = NULL; | |
e59399d0 | 320 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
321 | |
322 | nilfs_detach_checkpoint(sbi); | |
323 | put_nilfs(sbi->s_nilfs); | |
324 | sbi->s_super = NULL; | |
325 | sb->s_fs_info = NULL; | |
6dd47406 | 326 | nilfs_put_sbinfo(sbi); |
6cfd0148 CH |
327 | |
328 | unlock_kernel(); | |
783f6184 RK |
329 | } |
330 | ||
783f6184 RK |
331 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
332 | { | |
6233caa9 JS |
333 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
334 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
783f6184 RK |
335 | int err = 0; |
336 | ||
337 | /* This function is called when super block should be written back */ | |
338 | if (wait) | |
339 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
340 | |
341 | down_write(&nilfs->ns_sem); | |
e605f0a7 | 342 | if (nilfs_sb_dirty(nilfs)) |
6233caa9 JS |
343 | nilfs_commit_super(sbi, 1); |
344 | up_write(&nilfs->ns_sem); | |
345 | ||
783f6184 RK |
346 | return err; |
347 | } | |
348 | ||
349 | int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno) | |
350 | { | |
351 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
352 | struct nilfs_checkpoint *raw_cp; | |
353 | struct buffer_head *bh_cp; | |
354 | int err; | |
355 | ||
e59399d0 | 356 | down_write(&nilfs->ns_super_sem); |
783f6184 | 357 | list_add(&sbi->s_list, &nilfs->ns_supers); |
e59399d0 | 358 | up_write(&nilfs->ns_super_sem); |
783f6184 | 359 | |
79739565 | 360 | sbi->s_ifile = nilfs_ifile_new(sbi, nilfs->ns_inode_size); |
783f6184 RK |
361 | if (!sbi->s_ifile) |
362 | return -ENOMEM; | |
363 | ||
1154ecbd | 364 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
365 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
366 | &bh_cp); | |
1154ecbd | 367 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
368 | if (unlikely(err)) { |
369 | if (err == -ENOENT || err == -EINVAL) { | |
370 | printk(KERN_ERR | |
371 | "NILFS: Invalid checkpoint " | |
372 | "(checkpoint number=%llu)\n", | |
373 | (unsigned long long)cno); | |
374 | err = -EINVAL; | |
375 | } | |
376 | goto failed; | |
377 | } | |
378 | err = nilfs_read_inode_common(sbi->s_ifile, &raw_cp->cp_ifile_inode); | |
379 | if (unlikely(err)) | |
380 | goto failed_bh; | |
381 | atomic_set(&sbi->s_inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); | |
382 | atomic_set(&sbi->s_blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); | |
383 | ||
384 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
385 | return 0; | |
386 | ||
387 | failed_bh: | |
388 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
389 | failed: | |
390 | nilfs_mdt_destroy(sbi->s_ifile); | |
391 | sbi->s_ifile = NULL; | |
392 | ||
e59399d0 | 393 | down_write(&nilfs->ns_super_sem); |
783f6184 | 394 | list_del_init(&sbi->s_list); |
e59399d0 | 395 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
396 | |
397 | return err; | |
398 | } | |
399 | ||
400 | void nilfs_detach_checkpoint(struct nilfs_sb_info *sbi) | |
401 | { | |
402 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
403 | ||
783f6184 RK |
404 | nilfs_mdt_destroy(sbi->s_ifile); |
405 | sbi->s_ifile = NULL; | |
e59399d0 | 406 | down_write(&nilfs->ns_super_sem); |
783f6184 | 407 | list_del_init(&sbi->s_list); |
e59399d0 | 408 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
409 | } |
410 | ||
783f6184 RK |
411 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
412 | { | |
413 | struct super_block *sb = dentry->d_sb; | |
414 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
c306af23 RK |
415 | struct the_nilfs *nilfs = sbi->s_nilfs; |
416 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
783f6184 RK |
417 | unsigned long long blocks; |
418 | unsigned long overhead; | |
419 | unsigned long nrsvblocks; | |
420 | sector_t nfreeblocks; | |
783f6184 RK |
421 | int err; |
422 | ||
423 | /* | |
424 | * Compute all of the segment blocks | |
425 | * | |
426 | * The blocks before first segment and after last segment | |
427 | * are excluded. | |
428 | */ | |
429 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
430 | - nilfs->ns_first_data_block; | |
431 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
432 | ||
433 | /* | |
434 | * Compute the overhead | |
435 | * | |
7a65004b | 436 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
437 | * We must count them as the overhead. |
438 | */ | |
439 | overhead = 0; | |
440 | ||
441 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
442 | if (unlikely(err)) | |
443 | return err; | |
444 | ||
445 | buf->f_type = NILFS_SUPER_MAGIC; | |
446 | buf->f_bsize = sb->s_blocksize; | |
447 | buf->f_blocks = blocks - overhead; | |
448 | buf->f_bfree = nfreeblocks; | |
449 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
450 | (buf->f_bfree - nrsvblocks) : 0; | |
451 | buf->f_files = atomic_read(&sbi->s_inodes_count); | |
452 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ | |
453 | buf->f_namelen = NILFS_NAME_LEN; | |
c306af23 RK |
454 | buf->f_fsid.val[0] = (u32)id; |
455 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
456 | ||
783f6184 RK |
457 | return 0; |
458 | } | |
459 | ||
b58a285b JS |
460 | static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
461 | { | |
462 | struct super_block *sb = vfs->mnt_sb; | |
463 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
464 | ||
465 | if (!nilfs_test_opt(sbi, BARRIER)) | |
91f1953b | 466 | seq_printf(seq, ",nobarrier"); |
b58a285b JS |
467 | if (nilfs_test_opt(sbi, SNAPSHOT)) |
468 | seq_printf(seq, ",cp=%llu", | |
469 | (unsigned long long int)sbi->s_snapshot_cno); | |
b58a285b JS |
470 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) |
471 | seq_printf(seq, ",errors=panic"); | |
277a6a34 RK |
472 | if (nilfs_test_opt(sbi, ERRORS_CONT)) |
473 | seq_printf(seq, ",errors=continue"); | |
b58a285b JS |
474 | if (nilfs_test_opt(sbi, STRICT_ORDER)) |
475 | seq_printf(seq, ",order=strict"); | |
0234576d RK |
476 | if (nilfs_test_opt(sbi, NORECOVERY)) |
477 | seq_printf(seq, ",norecovery"); | |
e902ec99 JS |
478 | if (nilfs_test_opt(sbi, DISCARD)) |
479 | seq_printf(seq, ",discard"); | |
b58a285b JS |
480 | |
481 | return 0; | |
482 | } | |
483 | ||
b87221de | 484 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
485 | .alloc_inode = nilfs_alloc_inode, |
486 | .destroy_inode = nilfs_destroy_inode, | |
487 | .dirty_inode = nilfs_dirty_inode, | |
488 | /* .write_inode = nilfs_write_inode, */ | |
489 | /* .put_inode = nilfs_put_inode, */ | |
490 | /* .drop_inode = nilfs_drop_inode, */ | |
491 | .delete_inode = nilfs_delete_inode, | |
492 | .put_super = nilfs_put_super, | |
1dfa2710 | 493 | /* .write_super = nilfs_write_super, */ |
783f6184 RK |
494 | .sync_fs = nilfs_sync_fs, |
495 | /* .write_super_lockfs */ | |
496 | /* .unlockfs */ | |
497 | .statfs = nilfs_statfs, | |
498 | .remount_fs = nilfs_remount, | |
499 | .clear_inode = nilfs_clear_inode, | |
500 | /* .umount_begin */ | |
b58a285b | 501 | .show_options = nilfs_show_options |
783f6184 RK |
502 | }; |
503 | ||
504 | static struct inode * | |
505 | nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation) | |
506 | { | |
507 | struct inode *inode; | |
508 | ||
509 | if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO && | |
510 | ino != NILFS_SKETCH_INO) | |
511 | return ERR_PTR(-ESTALE); | |
512 | ||
513 | inode = nilfs_iget(sb, ino); | |
514 | if (IS_ERR(inode)) | |
515 | return ERR_CAST(inode); | |
516 | if (generation && inode->i_generation != generation) { | |
517 | iput(inode); | |
518 | return ERR_PTR(-ESTALE); | |
519 | } | |
520 | ||
521 | return inode; | |
522 | } | |
523 | ||
524 | static struct dentry * | |
525 | nilfs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, | |
526 | int fh_type) | |
527 | { | |
528 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
529 | nilfs_nfs_get_inode); | |
530 | } | |
531 | ||
532 | static struct dentry * | |
533 | nilfs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, | |
534 | int fh_type) | |
535 | { | |
536 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
537 | nilfs_nfs_get_inode); | |
538 | } | |
539 | ||
ac4cfdd6 | 540 | static const struct export_operations nilfs_export_ops = { |
783f6184 RK |
541 | .fh_to_dentry = nilfs_fh_to_dentry, |
542 | .fh_to_parent = nilfs_fh_to_parent, | |
543 | .get_parent = nilfs_get_parent, | |
544 | }; | |
545 | ||
546 | enum { | |
547 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
0234576d | 548 | Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
e902ec99 | 549 | Opt_discard, Opt_err, |
783f6184 RK |
550 | }; |
551 | ||
552 | static match_table_t tokens = { | |
553 | {Opt_err_cont, "errors=continue"}, | |
554 | {Opt_err_panic, "errors=panic"}, | |
555 | {Opt_err_ro, "errors=remount-ro"}, | |
91f1953b | 556 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
557 | {Opt_snapshot, "cp=%u"}, |
558 | {Opt_order, "order=%s"}, | |
0234576d | 559 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 560 | {Opt_discard, "discard"}, |
783f6184 RK |
561 | {Opt_err, NULL} |
562 | }; | |
563 | ||
783f6184 RK |
564 | static int parse_options(char *options, struct super_block *sb) |
565 | { | |
566 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
567 | char *p; | |
568 | substring_t args[MAX_OPT_ARGS]; | |
569 | int option; | |
570 | ||
571 | if (!options) | |
572 | return 1; | |
573 | ||
574 | while ((p = strsep(&options, ",")) != NULL) { | |
575 | int token; | |
576 | if (!*p) | |
577 | continue; | |
578 | ||
579 | token = match_token(p, tokens, args); | |
580 | switch (token) { | |
91f1953b JS |
581 | case Opt_nobarrier: |
582 | nilfs_clear_opt(sbi, BARRIER); | |
783f6184 RK |
583 | break; |
584 | case Opt_order: | |
585 | if (strcmp(args[0].from, "relaxed") == 0) | |
586 | /* Ordered data semantics */ | |
587 | nilfs_clear_opt(sbi, STRICT_ORDER); | |
588 | else if (strcmp(args[0].from, "strict") == 0) | |
589 | /* Strict in-order semantics */ | |
590 | nilfs_set_opt(sbi, STRICT_ORDER); | |
591 | else | |
592 | return 0; | |
593 | break; | |
594 | case Opt_err_panic: | |
595 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC); | |
596 | break; | |
597 | case Opt_err_ro: | |
598 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO); | |
599 | break; | |
600 | case Opt_err_cont: | |
601 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT); | |
602 | break; | |
603 | case Opt_snapshot: | |
604 | if (match_int(&args[0], &option) || option <= 0) | |
605 | return 0; | |
606 | if (!(sb->s_flags & MS_RDONLY)) | |
607 | return 0; | |
608 | sbi->s_snapshot_cno = option; | |
609 | nilfs_set_opt(sbi, SNAPSHOT); | |
610 | break; | |
0234576d RK |
611 | case Opt_norecovery: |
612 | nilfs_set_opt(sbi, NORECOVERY); | |
613 | break; | |
e902ec99 JS |
614 | case Opt_discard: |
615 | nilfs_set_opt(sbi, DISCARD); | |
616 | break; | |
783f6184 RK |
617 | default: |
618 | printk(KERN_ERR | |
619 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
620 | return 0; | |
621 | } | |
622 | } | |
623 | return 1; | |
624 | } | |
625 | ||
626 | static inline void | |
627 | nilfs_set_default_options(struct nilfs_sb_info *sbi, | |
628 | struct nilfs_super_block *sbp) | |
629 | { | |
630 | sbi->s_mount_opt = | |
277a6a34 | 631 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
632 | } |
633 | ||
634 | static int nilfs_setup_super(struct nilfs_sb_info *sbi) | |
635 | { | |
636 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
e339ad31 | 637 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; |
783f6184 RK |
638 | int max_mnt_count = le16_to_cpu(sbp->s_max_mnt_count); |
639 | int mnt_count = le16_to_cpu(sbp->s_mnt_count); | |
640 | ||
641 | /* nilfs->sem must be locked by the caller. */ | |
f50a4c81 | 642 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
783f6184 RK |
643 | printk(KERN_WARNING |
644 | "NILFS warning: mounting fs with errors\n"); | |
645 | #if 0 | |
646 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
647 | printk(KERN_WARNING | |
648 | "NILFS warning: maximal mount count reached\n"); | |
649 | #endif | |
650 | } | |
651 | if (!max_mnt_count) | |
652 | sbp->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); | |
653 | ||
654 | sbp->s_mnt_count = cpu_to_le16(mnt_count + 1); | |
655 | sbp->s_state = cpu_to_le16(le16_to_cpu(sbp->s_state) & ~NILFS_VALID_FS); | |
656 | sbp->s_mtime = cpu_to_le64(get_seconds()); | |
e339ad31 | 657 | return nilfs_commit_super(sbi, 1); |
783f6184 RK |
658 | } |
659 | ||
e339ad31 RK |
660 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
661 | u64 pos, int blocksize, | |
662 | struct buffer_head **pbh) | |
783f6184 | 663 | { |
e339ad31 RK |
664 | unsigned long long sb_index = pos; |
665 | unsigned long offset; | |
783f6184 | 666 | |
e339ad31 | 667 | offset = do_div(sb_index, blocksize); |
783f6184 | 668 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 669 | if (!*pbh) |
783f6184 | 670 | return NULL; |
783f6184 RK |
671 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
672 | } | |
673 | ||
783f6184 RK |
674 | int nilfs_store_magic_and_option(struct super_block *sb, |
675 | struct nilfs_super_block *sbp, | |
676 | char *data) | |
677 | { | |
678 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
679 | ||
783f6184 RK |
680 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
681 | ||
682 | /* FS independent flags */ | |
683 | #ifdef NILFS_ATIME_DISABLE | |
684 | sb->s_flags |= MS_NOATIME; | |
685 | #endif | |
686 | ||
783f6184 RK |
687 | nilfs_set_default_options(sbi, sbp); |
688 | ||
689 | sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid); | |
690 | sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid); | |
691 | sbi->s_interval = le32_to_cpu(sbp->s_c_interval); | |
692 | sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max); | |
693 | ||
e339ad31 | 694 | return !parse_options(data, sb) ? -EINVAL : 0 ; |
783f6184 RK |
695 | } |
696 | ||
697 | /** | |
698 | * nilfs_fill_super() - initialize a super block instance | |
699 | * @sb: super_block | |
700 | * @data: mount options | |
701 | * @silent: silent mode flag | |
702 | * @nilfs: the_nilfs struct | |
703 | * | |
aa7dfb89 | 704 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
705 | * So, the recovery process is protected from other simultaneous mounts. |
706 | */ | |
707 | static int | |
708 | nilfs_fill_super(struct super_block *sb, void *data, int silent, | |
709 | struct the_nilfs *nilfs) | |
710 | { | |
711 | struct nilfs_sb_info *sbi; | |
712 | struct inode *root; | |
713 | __u64 cno; | |
714 | int err; | |
715 | ||
716 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
717 | if (!sbi) | |
718 | return -ENOMEM; | |
719 | ||
720 | sb->s_fs_info = sbi; | |
721 | ||
722 | get_nilfs(nilfs); | |
723 | sbi->s_nilfs = nilfs; | |
724 | sbi->s_super = sb; | |
6dd47406 | 725 | atomic_set(&sbi->s_count, 1); |
783f6184 RK |
726 | |
727 | err = init_nilfs(nilfs, sbi, (char *)data); | |
728 | if (err) | |
729 | goto failed_sbi; | |
730 | ||
731 | spin_lock_init(&sbi->s_inode_lock); | |
732 | INIT_LIST_HEAD(&sbi->s_dirty_files); | |
733 | INIT_LIST_HEAD(&sbi->s_list); | |
734 | ||
735 | /* | |
736 | * Following initialization is overlapped because | |
737 | * nilfs_sb_info structure has been cleared at the beginning. | |
738 | * But we reserve them to keep our interest and make ready | |
739 | * for the future change. | |
740 | */ | |
741 | get_random_bytes(&sbi->s_next_generation, | |
742 | sizeof(sbi->s_next_generation)); | |
743 | spin_lock_init(&sbi->s_next_gen_lock); | |
744 | ||
745 | sb->s_op = &nilfs_sops; | |
746 | sb->s_export_op = &nilfs_export_ops; | |
747 | sb->s_root = NULL; | |
61239230 | 748 | sb->s_time_gran = 1; |
973bec34 | 749 | sb->s_bdi = nilfs->ns_bdi; |
783f6184 | 750 | |
f50a4c81 RK |
751 | err = load_nilfs(nilfs, sbi); |
752 | if (err) | |
753 | goto failed_sbi; | |
754 | ||
783f6184 RK |
755 | cno = nilfs_last_cno(nilfs); |
756 | ||
757 | if (sb->s_flags & MS_RDONLY) { | |
758 | if (nilfs_test_opt(sbi, SNAPSHOT)) { | |
43be0ec0 | 759 | down_read(&nilfs->ns_segctor_sem); |
1f5abe7e RK |
760 | err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, |
761 | sbi->s_snapshot_cno); | |
43be0ec0 ZY |
762 | up_read(&nilfs->ns_segctor_sem); |
763 | if (err < 0) { | |
764 | if (err == -ENOENT) | |
765 | err = -EINVAL; | |
1f5abe7e | 766 | goto failed_sbi; |
43be0ec0 | 767 | } |
1f5abe7e | 768 | if (!err) { |
783f6184 RK |
769 | printk(KERN_ERR |
770 | "NILFS: The specified checkpoint is " | |
771 | "not a snapshot " | |
772 | "(checkpoint number=%llu).\n", | |
773 | (unsigned long long)sbi->s_snapshot_cno); | |
774 | err = -EINVAL; | |
775 | goto failed_sbi; | |
776 | } | |
777 | cno = sbi->s_snapshot_cno; | |
d240e067 | 778 | } |
783f6184 RK |
779 | } |
780 | ||
781 | err = nilfs_attach_checkpoint(sbi, cno); | |
782 | if (err) { | |
783 | printk(KERN_ERR "NILFS: error loading a checkpoint" | |
784 | " (checkpoint number=%llu).\n", (unsigned long long)cno); | |
785 | goto failed_sbi; | |
786 | } | |
787 | ||
788 | if (!(sb->s_flags & MS_RDONLY)) { | |
cece5520 | 789 | err = nilfs_attach_segment_constructor(sbi); |
783f6184 RK |
790 | if (err) |
791 | goto failed_checkpoint; | |
792 | } | |
793 | ||
794 | root = nilfs_iget(sb, NILFS_ROOT_INO); | |
795 | if (IS_ERR(root)) { | |
796 | printk(KERN_ERR "NILFS: get root inode failed\n"); | |
797 | err = PTR_ERR(root); | |
798 | goto failed_segctor; | |
799 | } | |
800 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
801 | iput(root); | |
802 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); | |
803 | err = -EINVAL; | |
804 | goto failed_segctor; | |
805 | } | |
806 | sb->s_root = d_alloc_root(root); | |
807 | if (!sb->s_root) { | |
808 | iput(root); | |
809 | printk(KERN_ERR "NILFS: get root dentry failed\n"); | |
810 | err = -ENOMEM; | |
811 | goto failed_segctor; | |
812 | } | |
813 | ||
814 | if (!(sb->s_flags & MS_RDONLY)) { | |
815 | down_write(&nilfs->ns_sem); | |
816 | nilfs_setup_super(sbi); | |
817 | up_write(&nilfs->ns_sem); | |
818 | } | |
819 | ||
e59399d0 | 820 | down_write(&nilfs->ns_super_sem); |
3f82ff55 RK |
821 | if (!nilfs_test_opt(sbi, SNAPSHOT)) |
822 | nilfs->ns_current = sbi; | |
e59399d0 | 823 | up_write(&nilfs->ns_super_sem); |
3f82ff55 | 824 | |
783f6184 RK |
825 | return 0; |
826 | ||
783f6184 RK |
827 | failed_segctor: |
828 | nilfs_detach_segment_constructor(sbi); | |
829 | ||
830 | failed_checkpoint: | |
831 | nilfs_detach_checkpoint(sbi); | |
832 | ||
833 | failed_sbi: | |
834 | put_nilfs(nilfs); | |
835 | sb->s_fs_info = NULL; | |
6dd47406 | 836 | nilfs_put_sbinfo(sbi); |
783f6184 RK |
837 | return err; |
838 | } | |
839 | ||
840 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
841 | { | |
842 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
783f6184 RK |
843 | struct the_nilfs *nilfs = sbi->s_nilfs; |
844 | unsigned long old_sb_flags; | |
845 | struct nilfs_mount_options old_opts; | |
d240e067 | 846 | int was_snapshot, err; |
783f6184 | 847 | |
337eb00a AIB |
848 | lock_kernel(); |
849 | ||
e59399d0 | 850 | down_write(&nilfs->ns_super_sem); |
783f6184 RK |
851 | old_sb_flags = sb->s_flags; |
852 | old_opts.mount_opt = sbi->s_mount_opt; | |
853 | old_opts.snapshot_cno = sbi->s_snapshot_cno; | |
d240e067 | 854 | was_snapshot = nilfs_test_opt(sbi, SNAPSHOT); |
783f6184 RK |
855 | |
856 | if (!parse_options(data, sb)) { | |
857 | err = -EINVAL; | |
858 | goto restore_opts; | |
859 | } | |
860 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); | |
861 | ||
d240e067 RK |
862 | err = -EINVAL; |
863 | if (was_snapshot) { | |
864 | if (!(*flags & MS_RDONLY)) { | |
865 | printk(KERN_ERR "NILFS (device %s): cannot remount " | |
866 | "snapshot read/write.\n", | |
867 | sb->s_id); | |
868 | goto restore_opts; | |
869 | } else if (sbi->s_snapshot_cno != old_opts.snapshot_cno) { | |
870 | printk(KERN_ERR "NILFS (device %s): cannot " | |
871 | "remount to a different snapshot.\n", | |
872 | sb->s_id); | |
873 | goto restore_opts; | |
874 | } | |
875 | } else { | |
876 | if (nilfs_test_opt(sbi, SNAPSHOT)) { | |
877 | printk(KERN_ERR "NILFS (device %s): cannot change " | |
878 | "a regular mount to a snapshot.\n", | |
879 | sb->s_id); | |
880 | goto restore_opts; | |
881 | } | |
783f6184 RK |
882 | } |
883 | ||
0234576d RK |
884 | if (!nilfs_valid_fs(nilfs)) { |
885 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
886 | "remount because the filesystem is in an " | |
887 | "incomplete recovery state.\n", sb->s_id); | |
0234576d RK |
888 | goto restore_opts; |
889 | } | |
890 | ||
783f6184 RK |
891 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
892 | goto out; | |
893 | if (*flags & MS_RDONLY) { | |
894 | /* Shutting down the segment constructor */ | |
895 | nilfs_detach_segment_constructor(sbi); | |
896 | sb->s_flags |= MS_RDONLY; | |
897 | ||
783f6184 RK |
898 | /* |
899 | * Remounting a valid RW partition RDONLY, so set | |
900 | * the RDONLY flag and then mark the partition as valid again. | |
901 | */ | |
902 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 903 | nilfs_cleanup_super(sbi); |
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 | */ | |
783f6184 | 911 | sb->s_flags &= ~MS_RDONLY; |
783f6184 | 912 | |
cece5520 | 913 | err = nilfs_attach_segment_constructor(sbi); |
783f6184 | 914 | if (err) |
e59399d0 | 915 | goto restore_opts; |
783f6184 RK |
916 | |
917 | down_write(&nilfs->ns_sem); | |
918 | nilfs_setup_super(sbi); | |
919 | up_write(&nilfs->ns_sem); | |
783f6184 RK |
920 | } |
921 | out: | |
e59399d0 | 922 | up_write(&nilfs->ns_super_sem); |
337eb00a | 923 | unlock_kernel(); |
783f6184 RK |
924 | return 0; |
925 | ||
783f6184 RK |
926 | restore_opts: |
927 | sb->s_flags = old_sb_flags; | |
928 | sbi->s_mount_opt = old_opts.mount_opt; | |
929 | sbi->s_snapshot_cno = old_opts.snapshot_cno; | |
e59399d0 | 930 | up_write(&nilfs->ns_super_sem); |
337eb00a | 931 | unlock_kernel(); |
783f6184 RK |
932 | return err; |
933 | } | |
934 | ||
935 | struct nilfs_super_data { | |
936 | struct block_device *bdev; | |
6dd47406 | 937 | struct nilfs_sb_info *sbi; |
783f6184 RK |
938 | __u64 cno; |
939 | int flags; | |
940 | }; | |
941 | ||
942 | /** | |
943 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
944 | * @data: mount options | |
945 | * @sd: nilfs_super_data | |
946 | */ | |
947 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
948 | { | |
949 | char *p, *options = data; | |
950 | substring_t args[MAX_OPT_ARGS]; | |
951 | int option, token; | |
952 | int ret = 0; | |
953 | ||
954 | do { | |
955 | p = strsep(&options, ","); | |
956 | if (p != NULL && *p) { | |
957 | token = match_token(p, tokens, args); | |
958 | if (token == Opt_snapshot) { | |
959 | if (!(sd->flags & MS_RDONLY)) | |
960 | ret++; | |
961 | else { | |
962 | ret = match_int(&args[0], &option); | |
963 | if (!ret) { | |
964 | if (option > 0) | |
965 | sd->cno = option; | |
966 | else | |
967 | ret++; | |
968 | } | |
969 | } | |
970 | } | |
971 | if (ret) | |
972 | printk(KERN_ERR | |
973 | "NILFS: invalid mount option: %s\n", p); | |
974 | } | |
975 | if (!options) | |
976 | break; | |
977 | BUG_ON(options == data); | |
978 | *(options - 1) = ','; | |
979 | } while (!ret); | |
980 | return ret; | |
981 | } | |
982 | ||
983 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
984 | { | |
985 | struct nilfs_super_data *sd = data; | |
986 | ||
987 | s->s_bdev = sd->bdev; | |
988 | s->s_dev = s->s_bdev->bd_dev; | |
989 | return 0; | |
990 | } | |
991 | ||
992 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 RK |
993 | { |
994 | struct nilfs_super_data *sd = data; | |
6dd47406 RK |
995 | |
996 | return sd->sbi && s->s_fs_info == (void *)sd->sbi; | |
783f6184 RK |
997 | } |
998 | ||
999 | static int | |
1000 | nilfs_get_sb(struct file_system_type *fs_type, int flags, | |
1001 | const char *dev_name, void *data, struct vfsmount *mnt) | |
1002 | { | |
1003 | struct nilfs_super_data sd; | |
33c8e57c | 1004 | struct super_block *s; |
13e90559 | 1005 | fmode_t mode = FMODE_READ; |
33c8e57c | 1006 | struct the_nilfs *nilfs; |
783f6184 RK |
1007 | int err, need_to_close = 1; |
1008 | ||
13e90559 RK |
1009 | if (!(flags & MS_RDONLY)) |
1010 | mode |= FMODE_WRITE; | |
1011 | ||
1012 | sd.bdev = open_bdev_exclusive(dev_name, mode, fs_type); | |
783f6184 RK |
1013 | if (IS_ERR(sd.bdev)) |
1014 | return PTR_ERR(sd.bdev); | |
1015 | ||
1016 | /* | |
1017 | * To get mount instance using sget() vfs-routine, NILFS needs | |
1018 | * much more information than normal filesystems to identify mount | |
1019 | * instance. For snapshot mounts, not only a mount type (ro-mount | |
1020 | * or rw-mount) but also a checkpoint number is required. | |
783f6184 RK |
1021 | */ |
1022 | sd.cno = 0; | |
1023 | sd.flags = flags; | |
1024 | if (nilfs_identify((char *)data, &sd)) { | |
1025 | err = -EINVAL; | |
1026 | goto failed; | |
1027 | } | |
1028 | ||
33c8e57c RK |
1029 | nilfs = find_or_create_nilfs(sd.bdev); |
1030 | if (!nilfs) { | |
1031 | err = -ENOMEM; | |
1032 | goto failed; | |
1033 | } | |
1034 | ||
aa7dfb89 | 1035 | mutex_lock(&nilfs->ns_mount_mutex); |
3f82ff55 RK |
1036 | |
1037 | if (!sd.cno) { | |
1038 | /* | |
1039 | * Check if an exclusive mount exists or not. | |
1040 | * Snapshot mounts coexist with a current mount | |
1041 | * (i.e. rw-mount or ro-mount), whereas rw-mount and | |
1042 | * ro-mount are mutually exclusive. | |
1043 | */ | |
e59399d0 | 1044 | down_read(&nilfs->ns_super_sem); |
3f82ff55 RK |
1045 | if (nilfs->ns_current && |
1046 | ((nilfs->ns_current->s_super->s_flags ^ flags) | |
1047 | & MS_RDONLY)) { | |
e59399d0 | 1048 | up_read(&nilfs->ns_super_sem); |
3f82ff55 RK |
1049 | err = -EBUSY; |
1050 | goto failed_unlock; | |
1051 | } | |
e59399d0 | 1052 | up_read(&nilfs->ns_super_sem); |
783f6184 RK |
1053 | } |
1054 | ||
1055 | /* | |
6dd47406 | 1056 | * Find existing nilfs_sb_info struct |
783f6184 | 1057 | */ |
6dd47406 RK |
1058 | sd.sbi = nilfs_find_sbinfo(nilfs, !(flags & MS_RDONLY), sd.cno); |
1059 | ||
6dd47406 RK |
1060 | /* |
1061 | * Get super block instance holding the nilfs_sb_info struct. | |
1062 | * A new instance is allocated if no existing mount is present or | |
1063 | * existing instance has been unmounted. | |
1064 | */ | |
33c8e57c | 1065 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, &sd); |
6dd47406 RK |
1066 | if (sd.sbi) |
1067 | nilfs_put_sbinfo(sd.sbi); | |
1068 | ||
33c8e57c RK |
1069 | if (IS_ERR(s)) { |
1070 | err = PTR_ERR(s); | |
1071 | goto failed_unlock; | |
783f6184 RK |
1072 | } |
1073 | ||
1074 | if (!s->s_root) { | |
1075 | char b[BDEVNAME_SIZE]; | |
1076 | ||
33c8e57c | 1077 | /* New superblock instance created */ |
783f6184 | 1078 | s->s_flags = flags; |
4571b82c | 1079 | s->s_mode = mode; |
783f6184 RK |
1080 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); |
1081 | sb_set_blocksize(s, block_size(sd.bdev)); | |
1082 | ||
e2d1591a RK |
1083 | err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0, |
1084 | nilfs); | |
783f6184 RK |
1085 | if (err) |
1086 | goto cancel_new; | |
1087 | ||
1088 | s->s_flags |= MS_ACTIVE; | |
1089 | need_to_close = 0; | |
783f6184 RK |
1090 | } |
1091 | ||
aa7dfb89 | 1092 | mutex_unlock(&nilfs->ns_mount_mutex); |
783f6184 RK |
1093 | put_nilfs(nilfs); |
1094 | if (need_to_close) | |
13e90559 | 1095 | close_bdev_exclusive(sd.bdev, mode); |
783f6184 RK |
1096 | simple_set_mnt(mnt, s); |
1097 | return 0; | |
1098 | ||
783f6184 | 1099 | failed_unlock: |
aa7dfb89 | 1100 | mutex_unlock(&nilfs->ns_mount_mutex); |
33c8e57c | 1101 | put_nilfs(nilfs); |
783f6184 | 1102 | failed: |
13e90559 | 1103 | close_bdev_exclusive(sd.bdev, mode); |
783f6184 RK |
1104 | |
1105 | return err; | |
1106 | ||
1107 | cancel_new: | |
1108 | /* Abandoning the newly allocated superblock */ | |
aa7dfb89 | 1109 | mutex_unlock(&nilfs->ns_mount_mutex); |
33c8e57c | 1110 | put_nilfs(nilfs); |
a95161aa | 1111 | deactivate_locked_super(s); |
783f6184 | 1112 | /* |
b87ca919 | 1113 | * deactivate_locked_super() invokes close_bdev_exclusive(). |
783f6184 | 1114 | * We must finish all post-cleaning before this call; |
aa7dfb89 | 1115 | * put_nilfs() needs the block device. |
783f6184 RK |
1116 | */ |
1117 | return err; | |
1118 | } | |
1119 | ||
783f6184 RK |
1120 | struct file_system_type nilfs_fs_type = { |
1121 | .owner = THIS_MODULE, | |
1122 | .name = "nilfs2", | |
1123 | .get_sb = nilfs_get_sb, | |
1124 | .kill_sb = kill_block_super, | |
1125 | .fs_flags = FS_REQUIRES_DEV, | |
1126 | }; | |
1127 | ||
41c88bd7 | 1128 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1129 | { |
41c88bd7 | 1130 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1131 | |
41c88bd7 LH |
1132 | INIT_LIST_HEAD(&ii->i_dirty); |
1133 | #ifdef CONFIG_NILFS_XATTR | |
1134 | init_rwsem(&ii->xattr_sem); | |
1135 | #endif | |
1136 | nilfs_btnode_cache_init_once(&ii->i_btnode_cache); | |
1137 | ii->i_bmap = (struct nilfs_bmap *)&ii->i_bmap_union; | |
1138 | inode_init_once(&ii->vfs_inode); | |
1139 | } | |
783f6184 | 1140 | |
41c88bd7 LH |
1141 | static void nilfs_segbuf_init_once(void *obj) |
1142 | { | |
1143 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1144 | } | |
783f6184 | 1145 | |
41c88bd7 LH |
1146 | static void nilfs_destroy_cachep(void) |
1147 | { | |
84cb0999 | 1148 | if (nilfs_inode_cachep) |
41c88bd7 | 1149 | kmem_cache_destroy(nilfs_inode_cachep); |
84cb0999 | 1150 | if (nilfs_transaction_cachep) |
41c88bd7 | 1151 | kmem_cache_destroy(nilfs_transaction_cachep); |
84cb0999 | 1152 | if (nilfs_segbuf_cachep) |
41c88bd7 | 1153 | kmem_cache_destroy(nilfs_segbuf_cachep); |
84cb0999 | 1154 | if (nilfs_btree_path_cache) |
41c88bd7 LH |
1155 | kmem_cache_destroy(nilfs_btree_path_cache); |
1156 | } | |
783f6184 | 1157 | |
41c88bd7 LH |
1158 | static int __init nilfs_init_cachep(void) |
1159 | { | |
1160 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1161 | sizeof(struct nilfs_inode_info), 0, | |
1162 | SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once); | |
1163 | if (!nilfs_inode_cachep) | |
1164 | goto fail; | |
1165 | ||
1166 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1167 | sizeof(struct nilfs_transaction_info), 0, | |
1168 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1169 | if (!nilfs_transaction_cachep) | |
1170 | goto fail; | |
1171 | ||
1172 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1173 | sizeof(struct nilfs_segment_buffer), 0, | |
1174 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1175 | if (!nilfs_segbuf_cachep) | |
1176 | goto fail; | |
1177 | ||
1178 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1179 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1180 | 0, 0, NULL); | |
1181 | if (!nilfs_btree_path_cache) | |
1182 | goto fail; | |
783f6184 RK |
1183 | |
1184 | return 0; | |
1185 | ||
41c88bd7 LH |
1186 | fail: |
1187 | nilfs_destroy_cachep(); | |
1188 | return -ENOMEM; | |
1189 | } | |
1190 | ||
1191 | static int __init init_nilfs_fs(void) | |
1192 | { | |
1193 | int err; | |
783f6184 | 1194 | |
41c88bd7 LH |
1195 | err = nilfs_init_cachep(); |
1196 | if (err) | |
1197 | goto fail; | |
783f6184 | 1198 | |
41c88bd7 LH |
1199 | err = register_filesystem(&nilfs_fs_type); |
1200 | if (err) | |
1201 | goto free_cachep; | |
783f6184 | 1202 | |
9f130263 | 1203 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1204 | return 0; |
783f6184 | 1205 | |
41c88bd7 LH |
1206 | free_cachep: |
1207 | nilfs_destroy_cachep(); | |
1208 | fail: | |
783f6184 RK |
1209 | return err; |
1210 | } | |
1211 | ||
1212 | static void __exit exit_nilfs_fs(void) | |
1213 | { | |
41c88bd7 | 1214 | nilfs_destroy_cachep(); |
783f6184 RK |
1215 | unregister_filesystem(&nilfs_fs_type); |
1216 | } | |
1217 | ||
1218 | module_init(init_nilfs_fs) | |
1219 | module_exit(exit_nilfs_fs) |