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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 RK |
76 | |
77 | /** | |
78 | * nilfs_error() - report failure condition on a filesystem | |
79 | * | |
80 | * nilfs_error() sets an ERROR_FS flag on the superblock as well as | |
81 | * reporting an error message. It should be called when NILFS detects | |
82 | * incoherences or defects of meta data on disk. As for sustainable | |
83 | * errors such as a single-shot I/O error, nilfs_warning() or the printk() | |
84 | * function should be used instead. | |
85 | * | |
86 | * The segment constructor must not call this function because it can | |
87 | * kill itself. | |
88 | */ | |
89 | void nilfs_error(struct super_block *sb, const char *function, | |
90 | const char *fmt, ...) | |
91 | { | |
92 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
93 | va_list args; | |
94 | ||
95 | va_start(args, fmt); | |
96 | printk(KERN_CRIT "NILFS error (device %s): %s: ", sb->s_id, function); | |
97 | vprintk(fmt, args); | |
98 | printk("\n"); | |
99 | va_end(args); | |
100 | ||
101 | if (!(sb->s_flags & MS_RDONLY)) { | |
102 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
103 | ||
783f6184 RK |
104 | down_write(&nilfs->ns_sem); |
105 | if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { | |
106 | nilfs->ns_mount_state |= NILFS_ERROR_FS; | |
e339ad31 RK |
107 | nilfs->ns_sbp[0]->s_state |= |
108 | cpu_to_le16(NILFS_ERROR_FS); | |
109 | nilfs_commit_super(sbi, 1); | |
783f6184 RK |
110 | } |
111 | up_write(&nilfs->ns_sem); | |
112 | ||
113 | if (nilfs_test_opt(sbi, ERRORS_RO)) { | |
114 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
115 | sb->s_flags |= MS_RDONLY; | |
116 | } | |
117 | } | |
118 | ||
119 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) | |
120 | panic("NILFS (device %s): panic forced after error\n", | |
121 | sb->s_id); | |
122 | } | |
123 | ||
124 | void nilfs_warning(struct super_block *sb, const char *function, | |
125 | const char *fmt, ...) | |
126 | { | |
127 | va_list args; | |
128 | ||
129 | va_start(args, fmt); | |
130 | printk(KERN_WARNING "NILFS warning (device %s): %s: ", | |
131 | sb->s_id, function); | |
132 | vprintk(fmt, args); | |
133 | printk("\n"); | |
134 | va_end(args); | |
135 | } | |
136 | ||
783f6184 | 137 | |
a53b4751 | 138 | struct inode *nilfs_alloc_inode_common(struct the_nilfs *nilfs) |
783f6184 RK |
139 | { |
140 | struct nilfs_inode_info *ii; | |
141 | ||
142 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); | |
143 | if (!ii) | |
144 | return NULL; | |
145 | ii->i_bh = NULL; | |
146 | ii->i_state = 0; | |
147 | ii->vfs_inode.i_version = 1; | |
a53b4751 | 148 | nilfs_btnode_cache_init(&ii->i_btnode_cache, nilfs->ns_bdi); |
783f6184 RK |
149 | return &ii->vfs_inode; |
150 | } | |
151 | ||
a53b4751 RK |
152 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
153 | { | |
154 | return nilfs_alloc_inode_common(NILFS_SB(sb)->s_nilfs); | |
155 | } | |
156 | ||
783f6184 RK |
157 | void nilfs_destroy_inode(struct inode *inode) |
158 | { | |
159 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); | |
160 | } | |
161 | ||
783f6184 RK |
162 | static void nilfs_clear_inode(struct inode *inode) |
163 | { | |
164 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
783f6184 | 165 | |
783f6184 RK |
166 | /* |
167 | * Free resources allocated in nilfs_read_inode(), here. | |
168 | */ | |
a2e7d2df | 169 | BUG_ON(!list_empty(&ii->i_dirty)); |
783f6184 RK |
170 | brelse(ii->i_bh); |
171 | ii->i_bh = NULL; | |
783f6184 RK |
172 | |
173 | if (test_bit(NILFS_I_BMAP, &ii->i_state)) | |
174 | nilfs_bmap_clear(ii->i_bmap); | |
175 | ||
176 | nilfs_btnode_cache_clear(&ii->i_btnode_cache); | |
783f6184 RK |
177 | } |
178 | ||
e339ad31 | 179 | static int nilfs_sync_super(struct nilfs_sb_info *sbi, int dupsb) |
783f6184 RK |
180 | { |
181 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
182 | int err; | |
183 | int barrier_done = 0; | |
184 | ||
185 | if (nilfs_test_opt(sbi, BARRIER)) { | |
e339ad31 | 186 | set_buffer_ordered(nilfs->ns_sbh[0]); |
783f6184 RK |
187 | barrier_done = 1; |
188 | } | |
189 | retry: | |
e339ad31 RK |
190 | set_buffer_dirty(nilfs->ns_sbh[0]); |
191 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); | |
783f6184 RK |
192 | if (err == -EOPNOTSUPP && barrier_done) { |
193 | nilfs_warning(sbi->s_super, __func__, | |
194 | "barrier-based sync failed. " | |
195 | "disabling barriers\n"); | |
196 | nilfs_clear_opt(sbi, BARRIER); | |
197 | barrier_done = 0; | |
e339ad31 | 198 | clear_buffer_ordered(nilfs->ns_sbh[0]); |
783f6184 RK |
199 | goto retry; |
200 | } | |
e339ad31 | 201 | if (unlikely(err)) { |
783f6184 RK |
202 | printk(KERN_ERR |
203 | "NILFS: unable to write superblock (err=%d)\n", err); | |
e339ad31 RK |
204 | if (err == -EIO && nilfs->ns_sbh[1]) { |
205 | nilfs_fall_back_super_block(nilfs); | |
206 | goto retry; | |
207 | } | |
208 | } else { | |
209 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; | |
210 | ||
211 | /* | |
212 | * The latest segment becomes trailable from the position | |
213 | * written in superblock. | |
214 | */ | |
783f6184 | 215 | clear_nilfs_discontinued(nilfs); |
e339ad31 RK |
216 | |
217 | /* update GC protection for recent segments */ | |
218 | if (nilfs->ns_sbh[1]) { | |
219 | sbp = NULL; | |
220 | if (dupsb) { | |
221 | set_buffer_dirty(nilfs->ns_sbh[1]); | |
222 | if (!sync_dirty_buffer(nilfs->ns_sbh[1])) | |
223 | sbp = nilfs->ns_sbp[1]; | |
224 | } | |
225 | } | |
226 | if (sbp) { | |
227 | spin_lock(&nilfs->ns_last_segment_lock); | |
228 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); | |
229 | spin_unlock(&nilfs->ns_last_segment_lock); | |
230 | } | |
783f6184 RK |
231 | } |
232 | ||
233 | return err; | |
234 | } | |
235 | ||
e339ad31 | 236 | int nilfs_commit_super(struct nilfs_sb_info *sbi, int dupsb) |
783f6184 RK |
237 | { |
238 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
e339ad31 | 239 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 240 | sector_t nfreeblocks; |
e339ad31 | 241 | time_t t; |
783f6184 RK |
242 | int err; |
243 | ||
244 | /* nilfs->sem must be locked by the caller. */ | |
e339ad31 RK |
245 | if (sbp[0]->s_magic != NILFS_SUPER_MAGIC) { |
246 | if (sbp[1] && sbp[1]->s_magic == NILFS_SUPER_MAGIC) | |
247 | nilfs_swap_super_block(nilfs); | |
248 | else { | |
249 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", | |
250 | sbi->s_super->s_id); | |
251 | return -EIO; | |
252 | } | |
253 | } | |
783f6184 RK |
254 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); |
255 | if (unlikely(err)) { | |
256 | printk(KERN_ERR "NILFS: failed to count free blocks\n"); | |
257 | return err; | |
258 | } | |
e339ad31 RK |
259 | spin_lock(&nilfs->ns_last_segment_lock); |
260 | sbp[0]->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
261 | sbp[0]->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
262 | sbp[0]->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
263 | spin_unlock(&nilfs->ns_last_segment_lock); | |
264 | ||
265 | t = get_seconds(); | |
266 | nilfs->ns_sbwtime[0] = t; | |
267 | sbp[0]->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
268 | sbp[0]->s_wtime = cpu_to_le64(t); | |
269 | sbp[0]->s_sum = 0; | |
270 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
271 | (unsigned char *)sbp[0], | |
272 | nilfs->ns_sbsize)); | |
273 | if (dupsb && sbp[1]) { | |
274 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
275 | nilfs->ns_sbwtime[1] = t; | |
276 | } | |
e605f0a7 | 277 | clear_nilfs_sb_dirty(nilfs); |
e339ad31 | 278 | return nilfs_sync_super(sbi, dupsb); |
783f6184 RK |
279 | } |
280 | ||
281 | static void nilfs_put_super(struct super_block *sb) | |
282 | { | |
283 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
284 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
285 | ||
6cfd0148 CH |
286 | lock_kernel(); |
287 | ||
783f6184 RK |
288 | nilfs_detach_segment_constructor(sbi); |
289 | ||
290 | if (!(sb->s_flags & MS_RDONLY)) { | |
291 | down_write(&nilfs->ns_sem); | |
e339ad31 RK |
292 | nilfs->ns_sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state); |
293 | nilfs_commit_super(sbi, 1); | |
783f6184 RK |
294 | up_write(&nilfs->ns_sem); |
295 | } | |
e59399d0 | 296 | down_write(&nilfs->ns_super_sem); |
3f82ff55 RK |
297 | if (nilfs->ns_current == sbi) |
298 | nilfs->ns_current = NULL; | |
e59399d0 | 299 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
300 | |
301 | nilfs_detach_checkpoint(sbi); | |
302 | put_nilfs(sbi->s_nilfs); | |
303 | sbi->s_super = NULL; | |
304 | sb->s_fs_info = NULL; | |
6dd47406 | 305 | nilfs_put_sbinfo(sbi); |
6cfd0148 CH |
306 | |
307 | unlock_kernel(); | |
783f6184 RK |
308 | } |
309 | ||
783f6184 RK |
310 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
311 | { | |
6233caa9 JS |
312 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
313 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
783f6184 RK |
314 | int err = 0; |
315 | ||
316 | /* This function is called when super block should be written back */ | |
317 | if (wait) | |
318 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
319 | |
320 | down_write(&nilfs->ns_sem); | |
e605f0a7 | 321 | if (nilfs_sb_dirty(nilfs)) |
6233caa9 JS |
322 | nilfs_commit_super(sbi, 1); |
323 | up_write(&nilfs->ns_sem); | |
324 | ||
783f6184 RK |
325 | return err; |
326 | } | |
327 | ||
328 | int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno) | |
329 | { | |
330 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
331 | struct nilfs_checkpoint *raw_cp; | |
332 | struct buffer_head *bh_cp; | |
333 | int err; | |
334 | ||
e59399d0 | 335 | down_write(&nilfs->ns_super_sem); |
783f6184 | 336 | list_add(&sbi->s_list, &nilfs->ns_supers); |
e59399d0 | 337 | up_write(&nilfs->ns_super_sem); |
783f6184 | 338 | |
79739565 | 339 | sbi->s_ifile = nilfs_ifile_new(sbi, nilfs->ns_inode_size); |
783f6184 RK |
340 | if (!sbi->s_ifile) |
341 | return -ENOMEM; | |
342 | ||
1154ecbd | 343 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
344 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
345 | &bh_cp); | |
1154ecbd | 346 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
347 | if (unlikely(err)) { |
348 | if (err == -ENOENT || err == -EINVAL) { | |
349 | printk(KERN_ERR | |
350 | "NILFS: Invalid checkpoint " | |
351 | "(checkpoint number=%llu)\n", | |
352 | (unsigned long long)cno); | |
353 | err = -EINVAL; | |
354 | } | |
355 | goto failed; | |
356 | } | |
357 | err = nilfs_read_inode_common(sbi->s_ifile, &raw_cp->cp_ifile_inode); | |
358 | if (unlikely(err)) | |
359 | goto failed_bh; | |
360 | atomic_set(&sbi->s_inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); | |
361 | atomic_set(&sbi->s_blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); | |
362 | ||
363 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
364 | return 0; | |
365 | ||
366 | failed_bh: | |
367 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
368 | failed: | |
369 | nilfs_mdt_destroy(sbi->s_ifile); | |
370 | sbi->s_ifile = NULL; | |
371 | ||
e59399d0 | 372 | down_write(&nilfs->ns_super_sem); |
783f6184 | 373 | list_del_init(&sbi->s_list); |
e59399d0 | 374 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
375 | |
376 | return err; | |
377 | } | |
378 | ||
379 | void nilfs_detach_checkpoint(struct nilfs_sb_info *sbi) | |
380 | { | |
381 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
382 | ||
783f6184 RK |
383 | nilfs_mdt_destroy(sbi->s_ifile); |
384 | sbi->s_ifile = NULL; | |
e59399d0 | 385 | down_write(&nilfs->ns_super_sem); |
783f6184 | 386 | list_del_init(&sbi->s_list); |
e59399d0 | 387 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
388 | } |
389 | ||
783f6184 RK |
390 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
391 | { | |
392 | struct super_block *sb = dentry->d_sb; | |
393 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
c306af23 RK |
394 | struct the_nilfs *nilfs = sbi->s_nilfs; |
395 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
783f6184 RK |
396 | unsigned long long blocks; |
397 | unsigned long overhead; | |
398 | unsigned long nrsvblocks; | |
399 | sector_t nfreeblocks; | |
783f6184 RK |
400 | int err; |
401 | ||
402 | /* | |
403 | * Compute all of the segment blocks | |
404 | * | |
405 | * The blocks before first segment and after last segment | |
406 | * are excluded. | |
407 | */ | |
408 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
409 | - nilfs->ns_first_data_block; | |
410 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
411 | ||
412 | /* | |
413 | * Compute the overhead | |
414 | * | |
7a65004b | 415 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
416 | * We must count them as the overhead. |
417 | */ | |
418 | overhead = 0; | |
419 | ||
420 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
421 | if (unlikely(err)) | |
422 | return err; | |
423 | ||
424 | buf->f_type = NILFS_SUPER_MAGIC; | |
425 | buf->f_bsize = sb->s_blocksize; | |
426 | buf->f_blocks = blocks - overhead; | |
427 | buf->f_bfree = nfreeblocks; | |
428 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
429 | (buf->f_bfree - nrsvblocks) : 0; | |
430 | buf->f_files = atomic_read(&sbi->s_inodes_count); | |
431 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ | |
432 | buf->f_namelen = NILFS_NAME_LEN; | |
c306af23 RK |
433 | buf->f_fsid.val[0] = (u32)id; |
434 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
435 | ||
783f6184 RK |
436 | return 0; |
437 | } | |
438 | ||
b58a285b JS |
439 | static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
440 | { | |
441 | struct super_block *sb = vfs->mnt_sb; | |
442 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
443 | ||
444 | if (!nilfs_test_opt(sbi, BARRIER)) | |
91f1953b | 445 | seq_printf(seq, ",nobarrier"); |
b58a285b JS |
446 | if (nilfs_test_opt(sbi, SNAPSHOT)) |
447 | seq_printf(seq, ",cp=%llu", | |
448 | (unsigned long long int)sbi->s_snapshot_cno); | |
b58a285b JS |
449 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) |
450 | seq_printf(seq, ",errors=panic"); | |
277a6a34 RK |
451 | if (nilfs_test_opt(sbi, ERRORS_CONT)) |
452 | seq_printf(seq, ",errors=continue"); | |
b58a285b JS |
453 | if (nilfs_test_opt(sbi, STRICT_ORDER)) |
454 | seq_printf(seq, ",order=strict"); | |
0234576d RK |
455 | if (nilfs_test_opt(sbi, NORECOVERY)) |
456 | seq_printf(seq, ",norecovery"); | |
e902ec99 JS |
457 | if (nilfs_test_opt(sbi, DISCARD)) |
458 | seq_printf(seq, ",discard"); | |
b58a285b JS |
459 | |
460 | return 0; | |
461 | } | |
462 | ||
b87221de | 463 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
464 | .alloc_inode = nilfs_alloc_inode, |
465 | .destroy_inode = nilfs_destroy_inode, | |
466 | .dirty_inode = nilfs_dirty_inode, | |
467 | /* .write_inode = nilfs_write_inode, */ | |
468 | /* .put_inode = nilfs_put_inode, */ | |
469 | /* .drop_inode = nilfs_drop_inode, */ | |
470 | .delete_inode = nilfs_delete_inode, | |
471 | .put_super = nilfs_put_super, | |
1dfa2710 | 472 | /* .write_super = nilfs_write_super, */ |
783f6184 RK |
473 | .sync_fs = nilfs_sync_fs, |
474 | /* .write_super_lockfs */ | |
475 | /* .unlockfs */ | |
476 | .statfs = nilfs_statfs, | |
477 | .remount_fs = nilfs_remount, | |
478 | .clear_inode = nilfs_clear_inode, | |
479 | /* .umount_begin */ | |
b58a285b | 480 | .show_options = nilfs_show_options |
783f6184 RK |
481 | }; |
482 | ||
483 | static struct inode * | |
484 | nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation) | |
485 | { | |
486 | struct inode *inode; | |
487 | ||
488 | if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO && | |
489 | ino != NILFS_SKETCH_INO) | |
490 | return ERR_PTR(-ESTALE); | |
491 | ||
492 | inode = nilfs_iget(sb, ino); | |
493 | if (IS_ERR(inode)) | |
494 | return ERR_CAST(inode); | |
495 | if (generation && inode->i_generation != generation) { | |
496 | iput(inode); | |
497 | return ERR_PTR(-ESTALE); | |
498 | } | |
499 | ||
500 | return inode; | |
501 | } | |
502 | ||
503 | static struct dentry * | |
504 | nilfs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, | |
505 | int fh_type) | |
506 | { | |
507 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
508 | nilfs_nfs_get_inode); | |
509 | } | |
510 | ||
511 | static struct dentry * | |
512 | nilfs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, | |
513 | int fh_type) | |
514 | { | |
515 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
516 | nilfs_nfs_get_inode); | |
517 | } | |
518 | ||
ac4cfdd6 | 519 | static const struct export_operations nilfs_export_ops = { |
783f6184 RK |
520 | .fh_to_dentry = nilfs_fh_to_dentry, |
521 | .fh_to_parent = nilfs_fh_to_parent, | |
522 | .get_parent = nilfs_get_parent, | |
523 | }; | |
524 | ||
525 | enum { | |
526 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
0234576d | 527 | Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
e902ec99 | 528 | Opt_discard, Opt_err, |
783f6184 RK |
529 | }; |
530 | ||
531 | static match_table_t tokens = { | |
532 | {Opt_err_cont, "errors=continue"}, | |
533 | {Opt_err_panic, "errors=panic"}, | |
534 | {Opt_err_ro, "errors=remount-ro"}, | |
91f1953b | 535 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
536 | {Opt_snapshot, "cp=%u"}, |
537 | {Opt_order, "order=%s"}, | |
0234576d | 538 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 539 | {Opt_discard, "discard"}, |
783f6184 RK |
540 | {Opt_err, NULL} |
541 | }; | |
542 | ||
783f6184 RK |
543 | static int parse_options(char *options, struct super_block *sb) |
544 | { | |
545 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
546 | char *p; | |
547 | substring_t args[MAX_OPT_ARGS]; | |
548 | int option; | |
549 | ||
550 | if (!options) | |
551 | return 1; | |
552 | ||
553 | while ((p = strsep(&options, ",")) != NULL) { | |
554 | int token; | |
555 | if (!*p) | |
556 | continue; | |
557 | ||
558 | token = match_token(p, tokens, args); | |
559 | switch (token) { | |
91f1953b JS |
560 | case Opt_nobarrier: |
561 | nilfs_clear_opt(sbi, BARRIER); | |
783f6184 RK |
562 | break; |
563 | case Opt_order: | |
564 | if (strcmp(args[0].from, "relaxed") == 0) | |
565 | /* Ordered data semantics */ | |
566 | nilfs_clear_opt(sbi, STRICT_ORDER); | |
567 | else if (strcmp(args[0].from, "strict") == 0) | |
568 | /* Strict in-order semantics */ | |
569 | nilfs_set_opt(sbi, STRICT_ORDER); | |
570 | else | |
571 | return 0; | |
572 | break; | |
573 | case Opt_err_panic: | |
574 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC); | |
575 | break; | |
576 | case Opt_err_ro: | |
577 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO); | |
578 | break; | |
579 | case Opt_err_cont: | |
580 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT); | |
581 | break; | |
582 | case Opt_snapshot: | |
583 | if (match_int(&args[0], &option) || option <= 0) | |
584 | return 0; | |
585 | if (!(sb->s_flags & MS_RDONLY)) | |
586 | return 0; | |
587 | sbi->s_snapshot_cno = option; | |
588 | nilfs_set_opt(sbi, SNAPSHOT); | |
589 | break; | |
0234576d RK |
590 | case Opt_norecovery: |
591 | nilfs_set_opt(sbi, NORECOVERY); | |
592 | break; | |
e902ec99 JS |
593 | case Opt_discard: |
594 | nilfs_set_opt(sbi, DISCARD); | |
595 | break; | |
783f6184 RK |
596 | default: |
597 | printk(KERN_ERR | |
598 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
599 | return 0; | |
600 | } | |
601 | } | |
602 | return 1; | |
603 | } | |
604 | ||
605 | static inline void | |
606 | nilfs_set_default_options(struct nilfs_sb_info *sbi, | |
607 | struct nilfs_super_block *sbp) | |
608 | { | |
609 | sbi->s_mount_opt = | |
277a6a34 | 610 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
611 | } |
612 | ||
613 | static int nilfs_setup_super(struct nilfs_sb_info *sbi) | |
614 | { | |
615 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
e339ad31 | 616 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; |
783f6184 RK |
617 | int max_mnt_count = le16_to_cpu(sbp->s_max_mnt_count); |
618 | int mnt_count = le16_to_cpu(sbp->s_mnt_count); | |
619 | ||
620 | /* nilfs->sem must be locked by the caller. */ | |
f50a4c81 | 621 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
783f6184 RK |
622 | printk(KERN_WARNING |
623 | "NILFS warning: mounting fs with errors\n"); | |
624 | #if 0 | |
625 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
626 | printk(KERN_WARNING | |
627 | "NILFS warning: maximal mount count reached\n"); | |
628 | #endif | |
629 | } | |
630 | if (!max_mnt_count) | |
631 | sbp->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); | |
632 | ||
633 | sbp->s_mnt_count = cpu_to_le16(mnt_count + 1); | |
634 | sbp->s_state = cpu_to_le16(le16_to_cpu(sbp->s_state) & ~NILFS_VALID_FS); | |
635 | sbp->s_mtime = cpu_to_le64(get_seconds()); | |
e339ad31 | 636 | return nilfs_commit_super(sbi, 1); |
783f6184 RK |
637 | } |
638 | ||
e339ad31 RK |
639 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
640 | u64 pos, int blocksize, | |
641 | struct buffer_head **pbh) | |
783f6184 | 642 | { |
e339ad31 RK |
643 | unsigned long long sb_index = pos; |
644 | unsigned long offset; | |
783f6184 | 645 | |
e339ad31 | 646 | offset = do_div(sb_index, blocksize); |
783f6184 | 647 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 648 | if (!*pbh) |
783f6184 | 649 | return NULL; |
783f6184 RK |
650 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
651 | } | |
652 | ||
783f6184 RK |
653 | int nilfs_store_magic_and_option(struct super_block *sb, |
654 | struct nilfs_super_block *sbp, | |
655 | char *data) | |
656 | { | |
657 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
658 | ||
783f6184 RK |
659 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
660 | ||
661 | /* FS independent flags */ | |
662 | #ifdef NILFS_ATIME_DISABLE | |
663 | sb->s_flags |= MS_NOATIME; | |
664 | #endif | |
665 | ||
783f6184 RK |
666 | nilfs_set_default_options(sbi, sbp); |
667 | ||
668 | sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid); | |
669 | sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid); | |
670 | sbi->s_interval = le32_to_cpu(sbp->s_c_interval); | |
671 | sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max); | |
672 | ||
e339ad31 | 673 | return !parse_options(data, sb) ? -EINVAL : 0 ; |
783f6184 RK |
674 | } |
675 | ||
676 | /** | |
677 | * nilfs_fill_super() - initialize a super block instance | |
678 | * @sb: super_block | |
679 | * @data: mount options | |
680 | * @silent: silent mode flag | |
681 | * @nilfs: the_nilfs struct | |
682 | * | |
aa7dfb89 | 683 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
684 | * So, the recovery process is protected from other simultaneous mounts. |
685 | */ | |
686 | static int | |
687 | nilfs_fill_super(struct super_block *sb, void *data, int silent, | |
688 | struct the_nilfs *nilfs) | |
689 | { | |
690 | struct nilfs_sb_info *sbi; | |
691 | struct inode *root; | |
692 | __u64 cno; | |
693 | int err; | |
694 | ||
695 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
696 | if (!sbi) | |
697 | return -ENOMEM; | |
698 | ||
699 | sb->s_fs_info = sbi; | |
700 | ||
701 | get_nilfs(nilfs); | |
702 | sbi->s_nilfs = nilfs; | |
703 | sbi->s_super = sb; | |
6dd47406 | 704 | atomic_set(&sbi->s_count, 1); |
783f6184 RK |
705 | |
706 | err = init_nilfs(nilfs, sbi, (char *)data); | |
707 | if (err) | |
708 | goto failed_sbi; | |
709 | ||
710 | spin_lock_init(&sbi->s_inode_lock); | |
711 | INIT_LIST_HEAD(&sbi->s_dirty_files); | |
712 | INIT_LIST_HEAD(&sbi->s_list); | |
713 | ||
714 | /* | |
715 | * Following initialization is overlapped because | |
716 | * nilfs_sb_info structure has been cleared at the beginning. | |
717 | * But we reserve them to keep our interest and make ready | |
718 | * for the future change. | |
719 | */ | |
720 | get_random_bytes(&sbi->s_next_generation, | |
721 | sizeof(sbi->s_next_generation)); | |
722 | spin_lock_init(&sbi->s_next_gen_lock); | |
723 | ||
724 | sb->s_op = &nilfs_sops; | |
725 | sb->s_export_op = &nilfs_export_ops; | |
726 | sb->s_root = NULL; | |
61239230 | 727 | sb->s_time_gran = 1; |
973bec34 | 728 | sb->s_bdi = nilfs->ns_bdi; |
783f6184 | 729 | |
f50a4c81 RK |
730 | err = load_nilfs(nilfs, sbi); |
731 | if (err) | |
732 | goto failed_sbi; | |
733 | ||
783f6184 RK |
734 | cno = nilfs_last_cno(nilfs); |
735 | ||
736 | if (sb->s_flags & MS_RDONLY) { | |
737 | if (nilfs_test_opt(sbi, SNAPSHOT)) { | |
43be0ec0 | 738 | down_read(&nilfs->ns_segctor_sem); |
1f5abe7e RK |
739 | err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, |
740 | sbi->s_snapshot_cno); | |
43be0ec0 ZY |
741 | up_read(&nilfs->ns_segctor_sem); |
742 | if (err < 0) { | |
743 | if (err == -ENOENT) | |
744 | err = -EINVAL; | |
1f5abe7e | 745 | goto failed_sbi; |
43be0ec0 | 746 | } |
1f5abe7e | 747 | if (!err) { |
783f6184 RK |
748 | printk(KERN_ERR |
749 | "NILFS: The specified checkpoint is " | |
750 | "not a snapshot " | |
751 | "(checkpoint number=%llu).\n", | |
752 | (unsigned long long)sbi->s_snapshot_cno); | |
753 | err = -EINVAL; | |
754 | goto failed_sbi; | |
755 | } | |
756 | cno = sbi->s_snapshot_cno; | |
757 | } else | |
758 | /* Read-only mount */ | |
759 | sbi->s_snapshot_cno = cno; | |
760 | } | |
761 | ||
762 | err = nilfs_attach_checkpoint(sbi, cno); | |
763 | if (err) { | |
764 | printk(KERN_ERR "NILFS: error loading a checkpoint" | |
765 | " (checkpoint number=%llu).\n", (unsigned long long)cno); | |
766 | goto failed_sbi; | |
767 | } | |
768 | ||
769 | if (!(sb->s_flags & MS_RDONLY)) { | |
cece5520 | 770 | err = nilfs_attach_segment_constructor(sbi); |
783f6184 RK |
771 | if (err) |
772 | goto failed_checkpoint; | |
773 | } | |
774 | ||
775 | root = nilfs_iget(sb, NILFS_ROOT_INO); | |
776 | if (IS_ERR(root)) { | |
777 | printk(KERN_ERR "NILFS: get root inode failed\n"); | |
778 | err = PTR_ERR(root); | |
779 | goto failed_segctor; | |
780 | } | |
781 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
782 | iput(root); | |
783 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); | |
784 | err = -EINVAL; | |
785 | goto failed_segctor; | |
786 | } | |
787 | sb->s_root = d_alloc_root(root); | |
788 | if (!sb->s_root) { | |
789 | iput(root); | |
790 | printk(KERN_ERR "NILFS: get root dentry failed\n"); | |
791 | err = -ENOMEM; | |
792 | goto failed_segctor; | |
793 | } | |
794 | ||
795 | if (!(sb->s_flags & MS_RDONLY)) { | |
796 | down_write(&nilfs->ns_sem); | |
797 | nilfs_setup_super(sbi); | |
798 | up_write(&nilfs->ns_sem); | |
799 | } | |
800 | ||
e59399d0 | 801 | down_write(&nilfs->ns_super_sem); |
3f82ff55 RK |
802 | if (!nilfs_test_opt(sbi, SNAPSHOT)) |
803 | nilfs->ns_current = sbi; | |
e59399d0 | 804 | up_write(&nilfs->ns_super_sem); |
3f82ff55 | 805 | |
783f6184 RK |
806 | return 0; |
807 | ||
783f6184 RK |
808 | failed_segctor: |
809 | nilfs_detach_segment_constructor(sbi); | |
810 | ||
811 | failed_checkpoint: | |
812 | nilfs_detach_checkpoint(sbi); | |
813 | ||
814 | failed_sbi: | |
815 | put_nilfs(nilfs); | |
816 | sb->s_fs_info = NULL; | |
6dd47406 | 817 | nilfs_put_sbinfo(sbi); |
783f6184 RK |
818 | return err; |
819 | } | |
820 | ||
821 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
822 | { | |
823 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
824 | struct nilfs_super_block *sbp; | |
825 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
826 | unsigned long old_sb_flags; | |
827 | struct nilfs_mount_options old_opts; | |
828 | int err; | |
829 | ||
337eb00a AIB |
830 | lock_kernel(); |
831 | ||
e59399d0 | 832 | down_write(&nilfs->ns_super_sem); |
783f6184 RK |
833 | old_sb_flags = sb->s_flags; |
834 | old_opts.mount_opt = sbi->s_mount_opt; | |
835 | old_opts.snapshot_cno = sbi->s_snapshot_cno; | |
836 | ||
837 | if (!parse_options(data, sb)) { | |
838 | err = -EINVAL; | |
839 | goto restore_opts; | |
840 | } | |
841 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); | |
842 | ||
843 | if ((*flags & MS_RDONLY) && | |
844 | sbi->s_snapshot_cno != old_opts.snapshot_cno) { | |
845 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
c91cea11 | 846 | "remount to a different snapshot.\n", |
783f6184 RK |
847 | sb->s_id); |
848 | err = -EINVAL; | |
849 | goto restore_opts; | |
850 | } | |
851 | ||
0234576d RK |
852 | if (!nilfs_valid_fs(nilfs)) { |
853 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
854 | "remount because the filesystem is in an " | |
855 | "incomplete recovery state.\n", sb->s_id); | |
856 | err = -EINVAL; | |
857 | goto restore_opts; | |
858 | } | |
859 | ||
783f6184 RK |
860 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
861 | goto out; | |
862 | if (*flags & MS_RDONLY) { | |
863 | /* Shutting down the segment constructor */ | |
864 | nilfs_detach_segment_constructor(sbi); | |
865 | sb->s_flags |= MS_RDONLY; | |
866 | ||
867 | sbi->s_snapshot_cno = nilfs_last_cno(nilfs); | |
868 | /* nilfs_set_opt(sbi, SNAPSHOT); */ | |
869 | ||
870 | /* | |
871 | * Remounting a valid RW partition RDONLY, so set | |
872 | * the RDONLY flag and then mark the partition as valid again. | |
873 | */ | |
874 | down_write(&nilfs->ns_sem); | |
e339ad31 | 875 | sbp = nilfs->ns_sbp[0]; |
783f6184 RK |
876 | if (!(sbp->s_state & le16_to_cpu(NILFS_VALID_FS)) && |
877 | (nilfs->ns_mount_state & NILFS_VALID_FS)) | |
878 | sbp->s_state = cpu_to_le16(nilfs->ns_mount_state); | |
879 | sbp->s_mtime = cpu_to_le64(get_seconds()); | |
e339ad31 | 880 | nilfs_commit_super(sbi, 1); |
783f6184 RK |
881 | up_write(&nilfs->ns_sem); |
882 | } else { | |
883 | /* | |
884 | * Mounting a RDONLY partition read-write, so reread and | |
885 | * store the current valid flag. (It may have been changed | |
886 | * by fsck since we originally mounted the partition.) | |
887 | */ | |
3f82ff55 | 888 | if (nilfs->ns_current && nilfs->ns_current != sbi) { |
783f6184 | 889 | printk(KERN_WARNING "NILFS (device %s): couldn't " |
3f82ff55 | 890 | "remount because an RW-mount exists.\n", |
783f6184 RK |
891 | sb->s_id); |
892 | err = -EBUSY; | |
e59399d0 | 893 | goto restore_opts; |
783f6184 RK |
894 | } |
895 | if (sbi->s_snapshot_cno != nilfs_last_cno(nilfs)) { | |
896 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
897 | "remount because the current RO-mount is not " | |
898 | "the latest one.\n", | |
899 | sb->s_id); | |
900 | err = -EINVAL; | |
e59399d0 | 901 | goto restore_opts; |
783f6184 RK |
902 | } |
903 | sb->s_flags &= ~MS_RDONLY; | |
904 | nilfs_clear_opt(sbi, SNAPSHOT); | |
905 | sbi->s_snapshot_cno = 0; | |
906 | ||
cece5520 | 907 | err = nilfs_attach_segment_constructor(sbi); |
783f6184 | 908 | if (err) |
e59399d0 | 909 | goto restore_opts; |
783f6184 RK |
910 | |
911 | down_write(&nilfs->ns_sem); | |
912 | nilfs_setup_super(sbi); | |
913 | up_write(&nilfs->ns_sem); | |
914 | ||
e59399d0 | 915 | nilfs->ns_current = sbi; |
783f6184 RK |
916 | } |
917 | out: | |
e59399d0 | 918 | up_write(&nilfs->ns_super_sem); |
337eb00a | 919 | unlock_kernel(); |
783f6184 RK |
920 | return 0; |
921 | ||
783f6184 RK |
922 | restore_opts: |
923 | sb->s_flags = old_sb_flags; | |
924 | sbi->s_mount_opt = old_opts.mount_opt; | |
925 | sbi->s_snapshot_cno = old_opts.snapshot_cno; | |
e59399d0 | 926 | up_write(&nilfs->ns_super_sem); |
337eb00a | 927 | unlock_kernel(); |
783f6184 RK |
928 | return err; |
929 | } | |
930 | ||
931 | struct nilfs_super_data { | |
932 | struct block_device *bdev; | |
6dd47406 | 933 | struct nilfs_sb_info *sbi; |
783f6184 RK |
934 | __u64 cno; |
935 | int flags; | |
936 | }; | |
937 | ||
938 | /** | |
939 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
940 | * @data: mount options | |
941 | * @sd: nilfs_super_data | |
942 | */ | |
943 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
944 | { | |
945 | char *p, *options = data; | |
946 | substring_t args[MAX_OPT_ARGS]; | |
947 | int option, token; | |
948 | int ret = 0; | |
949 | ||
950 | do { | |
951 | p = strsep(&options, ","); | |
952 | if (p != NULL && *p) { | |
953 | token = match_token(p, tokens, args); | |
954 | if (token == Opt_snapshot) { | |
955 | if (!(sd->flags & MS_RDONLY)) | |
956 | ret++; | |
957 | else { | |
958 | ret = match_int(&args[0], &option); | |
959 | if (!ret) { | |
960 | if (option > 0) | |
961 | sd->cno = option; | |
962 | else | |
963 | ret++; | |
964 | } | |
965 | } | |
966 | } | |
967 | if (ret) | |
968 | printk(KERN_ERR | |
969 | "NILFS: invalid mount option: %s\n", p); | |
970 | } | |
971 | if (!options) | |
972 | break; | |
973 | BUG_ON(options == data); | |
974 | *(options - 1) = ','; | |
975 | } while (!ret); | |
976 | return ret; | |
977 | } | |
978 | ||
979 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
980 | { | |
981 | struct nilfs_super_data *sd = data; | |
982 | ||
983 | s->s_bdev = sd->bdev; | |
984 | s->s_dev = s->s_bdev->bd_dev; | |
985 | return 0; | |
986 | } | |
987 | ||
988 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 RK |
989 | { |
990 | struct nilfs_super_data *sd = data; | |
6dd47406 RK |
991 | |
992 | return sd->sbi && s->s_fs_info == (void *)sd->sbi; | |
783f6184 RK |
993 | } |
994 | ||
995 | static int | |
996 | nilfs_get_sb(struct file_system_type *fs_type, int flags, | |
997 | const char *dev_name, void *data, struct vfsmount *mnt) | |
998 | { | |
999 | struct nilfs_super_data sd; | |
33c8e57c RK |
1000 | struct super_block *s; |
1001 | struct the_nilfs *nilfs; | |
783f6184 RK |
1002 | int err, need_to_close = 1; |
1003 | ||
1004 | sd.bdev = open_bdev_exclusive(dev_name, flags, fs_type); | |
1005 | if (IS_ERR(sd.bdev)) | |
1006 | return PTR_ERR(sd.bdev); | |
1007 | ||
1008 | /* | |
1009 | * To get mount instance using sget() vfs-routine, NILFS needs | |
1010 | * much more information than normal filesystems to identify mount | |
1011 | * instance. For snapshot mounts, not only a mount type (ro-mount | |
1012 | * or rw-mount) but also a checkpoint number is required. | |
783f6184 RK |
1013 | */ |
1014 | sd.cno = 0; | |
1015 | sd.flags = flags; | |
1016 | if (nilfs_identify((char *)data, &sd)) { | |
1017 | err = -EINVAL; | |
1018 | goto failed; | |
1019 | } | |
1020 | ||
33c8e57c RK |
1021 | nilfs = find_or_create_nilfs(sd.bdev); |
1022 | if (!nilfs) { | |
1023 | err = -ENOMEM; | |
1024 | goto failed; | |
1025 | } | |
1026 | ||
aa7dfb89 | 1027 | mutex_lock(&nilfs->ns_mount_mutex); |
3f82ff55 RK |
1028 | |
1029 | if (!sd.cno) { | |
1030 | /* | |
1031 | * Check if an exclusive mount exists or not. | |
1032 | * Snapshot mounts coexist with a current mount | |
1033 | * (i.e. rw-mount or ro-mount), whereas rw-mount and | |
1034 | * ro-mount are mutually exclusive. | |
1035 | */ | |
e59399d0 | 1036 | down_read(&nilfs->ns_super_sem); |
3f82ff55 RK |
1037 | if (nilfs->ns_current && |
1038 | ((nilfs->ns_current->s_super->s_flags ^ flags) | |
1039 | & MS_RDONLY)) { | |
e59399d0 | 1040 | up_read(&nilfs->ns_super_sem); |
3f82ff55 RK |
1041 | err = -EBUSY; |
1042 | goto failed_unlock; | |
1043 | } | |
e59399d0 | 1044 | up_read(&nilfs->ns_super_sem); |
783f6184 RK |
1045 | } |
1046 | ||
1047 | /* | |
6dd47406 | 1048 | * Find existing nilfs_sb_info struct |
783f6184 | 1049 | */ |
6dd47406 RK |
1050 | sd.sbi = nilfs_find_sbinfo(nilfs, !(flags & MS_RDONLY), sd.cno); |
1051 | ||
6dd47406 RK |
1052 | /* |
1053 | * Get super block instance holding the nilfs_sb_info struct. | |
1054 | * A new instance is allocated if no existing mount is present or | |
1055 | * existing instance has been unmounted. | |
1056 | */ | |
33c8e57c | 1057 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, &sd); |
6dd47406 RK |
1058 | if (sd.sbi) |
1059 | nilfs_put_sbinfo(sd.sbi); | |
1060 | ||
33c8e57c RK |
1061 | if (IS_ERR(s)) { |
1062 | err = PTR_ERR(s); | |
1063 | goto failed_unlock; | |
783f6184 RK |
1064 | } |
1065 | ||
1066 | if (!s->s_root) { | |
1067 | char b[BDEVNAME_SIZE]; | |
1068 | ||
33c8e57c | 1069 | /* New superblock instance created */ |
783f6184 RK |
1070 | s->s_flags = flags; |
1071 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); | |
1072 | sb_set_blocksize(s, block_size(sd.bdev)); | |
1073 | ||
1074 | err = nilfs_fill_super(s, data, flags & MS_VERBOSE, nilfs); | |
1075 | if (err) | |
1076 | goto cancel_new; | |
1077 | ||
1078 | s->s_flags |= MS_ACTIVE; | |
1079 | need_to_close = 0; | |
783f6184 RK |
1080 | } |
1081 | ||
aa7dfb89 | 1082 | mutex_unlock(&nilfs->ns_mount_mutex); |
783f6184 RK |
1083 | put_nilfs(nilfs); |
1084 | if (need_to_close) | |
1085 | close_bdev_exclusive(sd.bdev, flags); | |
1086 | simple_set_mnt(mnt, s); | |
1087 | return 0; | |
1088 | ||
783f6184 | 1089 | failed_unlock: |
aa7dfb89 | 1090 | mutex_unlock(&nilfs->ns_mount_mutex); |
33c8e57c | 1091 | put_nilfs(nilfs); |
783f6184 RK |
1092 | failed: |
1093 | close_bdev_exclusive(sd.bdev, flags); | |
1094 | ||
1095 | return err; | |
1096 | ||
1097 | cancel_new: | |
1098 | /* Abandoning the newly allocated superblock */ | |
aa7dfb89 | 1099 | mutex_unlock(&nilfs->ns_mount_mutex); |
33c8e57c | 1100 | put_nilfs(nilfs); |
a95161aa | 1101 | deactivate_locked_super(s); |
783f6184 RK |
1102 | /* |
1103 | * deactivate_super() invokes close_bdev_exclusive(). | |
1104 | * We must finish all post-cleaning before this call; | |
aa7dfb89 | 1105 | * put_nilfs() needs the block device. |
783f6184 RK |
1106 | */ |
1107 | return err; | |
1108 | } | |
1109 | ||
783f6184 RK |
1110 | struct file_system_type nilfs_fs_type = { |
1111 | .owner = THIS_MODULE, | |
1112 | .name = "nilfs2", | |
1113 | .get_sb = nilfs_get_sb, | |
1114 | .kill_sb = kill_block_super, | |
1115 | .fs_flags = FS_REQUIRES_DEV, | |
1116 | }; | |
1117 | ||
41c88bd7 | 1118 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1119 | { |
41c88bd7 | 1120 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1121 | |
41c88bd7 LH |
1122 | INIT_LIST_HEAD(&ii->i_dirty); |
1123 | #ifdef CONFIG_NILFS_XATTR | |
1124 | init_rwsem(&ii->xattr_sem); | |
1125 | #endif | |
1126 | nilfs_btnode_cache_init_once(&ii->i_btnode_cache); | |
1127 | ii->i_bmap = (struct nilfs_bmap *)&ii->i_bmap_union; | |
1128 | inode_init_once(&ii->vfs_inode); | |
1129 | } | |
783f6184 | 1130 | |
41c88bd7 LH |
1131 | static void nilfs_segbuf_init_once(void *obj) |
1132 | { | |
1133 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1134 | } | |
783f6184 | 1135 | |
41c88bd7 LH |
1136 | static void nilfs_destroy_cachep(void) |
1137 | { | |
1138 | if (nilfs_inode_cachep) | |
1139 | kmem_cache_destroy(nilfs_inode_cachep); | |
1140 | if (nilfs_transaction_cachep) | |
1141 | kmem_cache_destroy(nilfs_transaction_cachep); | |
1142 | if (nilfs_segbuf_cachep) | |
1143 | kmem_cache_destroy(nilfs_segbuf_cachep); | |
1144 | if (nilfs_btree_path_cache) | |
1145 | kmem_cache_destroy(nilfs_btree_path_cache); | |
1146 | } | |
783f6184 | 1147 | |
41c88bd7 LH |
1148 | static int __init nilfs_init_cachep(void) |
1149 | { | |
1150 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1151 | sizeof(struct nilfs_inode_info), 0, | |
1152 | SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once); | |
1153 | if (!nilfs_inode_cachep) | |
1154 | goto fail; | |
1155 | ||
1156 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1157 | sizeof(struct nilfs_transaction_info), 0, | |
1158 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1159 | if (!nilfs_transaction_cachep) | |
1160 | goto fail; | |
1161 | ||
1162 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1163 | sizeof(struct nilfs_segment_buffer), 0, | |
1164 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1165 | if (!nilfs_segbuf_cachep) | |
1166 | goto fail; | |
1167 | ||
1168 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1169 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1170 | 0, 0, NULL); | |
1171 | if (!nilfs_btree_path_cache) | |
1172 | goto fail; | |
783f6184 RK |
1173 | |
1174 | return 0; | |
1175 | ||
41c88bd7 LH |
1176 | fail: |
1177 | nilfs_destroy_cachep(); | |
1178 | return -ENOMEM; | |
1179 | } | |
1180 | ||
1181 | static int __init init_nilfs_fs(void) | |
1182 | { | |
1183 | int err; | |
783f6184 | 1184 | |
41c88bd7 LH |
1185 | err = nilfs_init_cachep(); |
1186 | if (err) | |
1187 | goto fail; | |
783f6184 | 1188 | |
41c88bd7 LH |
1189 | err = register_filesystem(&nilfs_fs_type); |
1190 | if (err) | |
1191 | goto free_cachep; | |
783f6184 | 1192 | |
41c88bd7 | 1193 | return 0; |
783f6184 | 1194 | |
41c88bd7 LH |
1195 | free_cachep: |
1196 | nilfs_destroy_cachep(); | |
1197 | fail: | |
783f6184 RK |
1198 | return err; |
1199 | } | |
1200 | ||
1201 | static void __exit exit_nilfs_fs(void) | |
1202 | { | |
41c88bd7 | 1203 | nilfs_destroy_cachep(); |
783f6184 RK |
1204 | unregister_filesystem(&nilfs_fs_type); |
1205 | } | |
1206 | ||
1207 | module_init(init_nilfs_fs) | |
1208 | module_exit(exit_nilfs_fs) |