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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 | ||
60f46b7e RK |
240 | void nilfs_set_log_cursor(struct nilfs_super_block *sbp, |
241 | struct the_nilfs *nilfs) | |
242 | { | |
243 | sector_t nfreeblocks; | |
244 | ||
245 | /* nilfs->ns_sem must be locked by the caller. */ | |
246 | nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
247 | sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
248 | ||
249 | spin_lock(&nilfs->ns_last_segment_lock); | |
250 | sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
251 | sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
252 | sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
253 | spin_unlock(&nilfs->ns_last_segment_lock); | |
254 | } | |
255 | ||
e339ad31 | 256 | int nilfs_commit_super(struct nilfs_sb_info *sbi, int dupsb) |
783f6184 RK |
257 | { |
258 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
e339ad31 | 259 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
e339ad31 | 260 | time_t t; |
783f6184 RK |
261 | |
262 | /* nilfs->sem must be locked by the caller. */ | |
34cb9b5c RK |
263 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
264 | if (sbp[1] && sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) | |
e339ad31 RK |
265 | nilfs_swap_super_block(nilfs); |
266 | else { | |
267 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", | |
268 | sbi->s_super->s_id); | |
269 | return -EIO; | |
270 | } | |
271 | } | |
60f46b7e | 272 | nilfs_set_log_cursor(sbp[0], nilfs); |
e339ad31 RK |
273 | |
274 | t = get_seconds(); | |
275 | nilfs->ns_sbwtime[0] = t; | |
e339ad31 RK |
276 | sbp[0]->s_wtime = cpu_to_le64(t); |
277 | sbp[0]->s_sum = 0; | |
278 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
279 | (unsigned char *)sbp[0], | |
280 | nilfs->ns_sbsize)); | |
281 | if (dupsb && sbp[1]) { | |
282 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
283 | nilfs->ns_sbwtime[1] = t; | |
284 | } | |
e605f0a7 | 285 | clear_nilfs_sb_dirty(nilfs); |
e339ad31 | 286 | return nilfs_sync_super(sbi, dupsb); |
783f6184 RK |
287 | } |
288 | ||
7ecaa46c RK |
289 | /** |
290 | * nilfs_cleanup_super() - write filesystem state for cleanup | |
291 | * @sbi: nilfs_sb_info to be unmounted or degraded to read-only | |
292 | * | |
293 | * This function restores state flags in the on-disk super block. | |
294 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the | |
295 | * filesystem was not clean previously. | |
296 | */ | |
297 | int nilfs_cleanup_super(struct nilfs_sb_info *sbi) | |
298 | { | |
299 | struct nilfs_super_block **sbp = sbi->s_nilfs->ns_sbp; | |
300 | int ret; | |
301 | ||
302 | sbp[0]->s_state = cpu_to_le16(sbi->s_nilfs->ns_mount_state); | |
303 | ret = nilfs_commit_super(sbi, 1); | |
304 | return ret; | |
305 | } | |
306 | ||
783f6184 RK |
307 | static void nilfs_put_super(struct super_block *sb) |
308 | { | |
309 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
310 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
311 | ||
6cfd0148 CH |
312 | lock_kernel(); |
313 | ||
783f6184 RK |
314 | nilfs_detach_segment_constructor(sbi); |
315 | ||
316 | if (!(sb->s_flags & MS_RDONLY)) { | |
317 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 318 | nilfs_cleanup_super(sbi); |
783f6184 RK |
319 | up_write(&nilfs->ns_sem); |
320 | } | |
e59399d0 | 321 | down_write(&nilfs->ns_super_sem); |
3f82ff55 RK |
322 | if (nilfs->ns_current == sbi) |
323 | nilfs->ns_current = NULL; | |
e59399d0 | 324 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
325 | |
326 | nilfs_detach_checkpoint(sbi); | |
327 | put_nilfs(sbi->s_nilfs); | |
328 | sbi->s_super = NULL; | |
329 | sb->s_fs_info = NULL; | |
6dd47406 | 330 | nilfs_put_sbinfo(sbi); |
6cfd0148 CH |
331 | |
332 | unlock_kernel(); | |
783f6184 RK |
333 | } |
334 | ||
783f6184 RK |
335 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
336 | { | |
6233caa9 JS |
337 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
338 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
783f6184 RK |
339 | int err = 0; |
340 | ||
341 | /* This function is called when super block should be written back */ | |
342 | if (wait) | |
343 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
344 | |
345 | down_write(&nilfs->ns_sem); | |
e605f0a7 | 346 | if (nilfs_sb_dirty(nilfs)) |
6233caa9 JS |
347 | nilfs_commit_super(sbi, 1); |
348 | up_write(&nilfs->ns_sem); | |
349 | ||
783f6184 RK |
350 | return err; |
351 | } | |
352 | ||
353 | int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno) | |
354 | { | |
355 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
356 | struct nilfs_checkpoint *raw_cp; | |
357 | struct buffer_head *bh_cp; | |
358 | int err; | |
359 | ||
e59399d0 | 360 | down_write(&nilfs->ns_super_sem); |
783f6184 | 361 | list_add(&sbi->s_list, &nilfs->ns_supers); |
e59399d0 | 362 | up_write(&nilfs->ns_super_sem); |
783f6184 | 363 | |
79739565 | 364 | sbi->s_ifile = nilfs_ifile_new(sbi, nilfs->ns_inode_size); |
783f6184 RK |
365 | if (!sbi->s_ifile) |
366 | return -ENOMEM; | |
367 | ||
1154ecbd | 368 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
369 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
370 | &bh_cp); | |
1154ecbd | 371 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
372 | if (unlikely(err)) { |
373 | if (err == -ENOENT || err == -EINVAL) { | |
374 | printk(KERN_ERR | |
375 | "NILFS: Invalid checkpoint " | |
376 | "(checkpoint number=%llu)\n", | |
377 | (unsigned long long)cno); | |
378 | err = -EINVAL; | |
379 | } | |
380 | goto failed; | |
381 | } | |
382 | err = nilfs_read_inode_common(sbi->s_ifile, &raw_cp->cp_ifile_inode); | |
383 | if (unlikely(err)) | |
384 | goto failed_bh; | |
385 | atomic_set(&sbi->s_inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); | |
386 | atomic_set(&sbi->s_blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); | |
387 | ||
388 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
389 | return 0; | |
390 | ||
391 | failed_bh: | |
392 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
393 | failed: | |
394 | nilfs_mdt_destroy(sbi->s_ifile); | |
395 | sbi->s_ifile = NULL; | |
396 | ||
e59399d0 | 397 | down_write(&nilfs->ns_super_sem); |
783f6184 | 398 | list_del_init(&sbi->s_list); |
e59399d0 | 399 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
400 | |
401 | return err; | |
402 | } | |
403 | ||
404 | void nilfs_detach_checkpoint(struct nilfs_sb_info *sbi) | |
405 | { | |
406 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
407 | ||
783f6184 RK |
408 | nilfs_mdt_destroy(sbi->s_ifile); |
409 | sbi->s_ifile = NULL; | |
e59399d0 | 410 | down_write(&nilfs->ns_super_sem); |
783f6184 | 411 | list_del_init(&sbi->s_list); |
e59399d0 | 412 | up_write(&nilfs->ns_super_sem); |
783f6184 RK |
413 | } |
414 | ||
783f6184 RK |
415 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
416 | { | |
417 | struct super_block *sb = dentry->d_sb; | |
418 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
c306af23 RK |
419 | struct the_nilfs *nilfs = sbi->s_nilfs; |
420 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
783f6184 RK |
421 | unsigned long long blocks; |
422 | unsigned long overhead; | |
423 | unsigned long nrsvblocks; | |
424 | sector_t nfreeblocks; | |
783f6184 RK |
425 | int err; |
426 | ||
427 | /* | |
428 | * Compute all of the segment blocks | |
429 | * | |
430 | * The blocks before first segment and after last segment | |
431 | * are excluded. | |
432 | */ | |
433 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
434 | - nilfs->ns_first_data_block; | |
435 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
436 | ||
437 | /* | |
438 | * Compute the overhead | |
439 | * | |
7a65004b | 440 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
441 | * We must count them as the overhead. |
442 | */ | |
443 | overhead = 0; | |
444 | ||
445 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
446 | if (unlikely(err)) | |
447 | return err; | |
448 | ||
449 | buf->f_type = NILFS_SUPER_MAGIC; | |
450 | buf->f_bsize = sb->s_blocksize; | |
451 | buf->f_blocks = blocks - overhead; | |
452 | buf->f_bfree = nfreeblocks; | |
453 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
454 | (buf->f_bfree - nrsvblocks) : 0; | |
455 | buf->f_files = atomic_read(&sbi->s_inodes_count); | |
456 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ | |
457 | buf->f_namelen = NILFS_NAME_LEN; | |
c306af23 RK |
458 | buf->f_fsid.val[0] = (u32)id; |
459 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
460 | ||
783f6184 RK |
461 | return 0; |
462 | } | |
463 | ||
b58a285b JS |
464 | static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
465 | { | |
466 | struct super_block *sb = vfs->mnt_sb; | |
467 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
468 | ||
469 | if (!nilfs_test_opt(sbi, BARRIER)) | |
91f1953b | 470 | seq_printf(seq, ",nobarrier"); |
b58a285b JS |
471 | if (nilfs_test_opt(sbi, SNAPSHOT)) |
472 | seq_printf(seq, ",cp=%llu", | |
473 | (unsigned long long int)sbi->s_snapshot_cno); | |
b58a285b JS |
474 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) |
475 | seq_printf(seq, ",errors=panic"); | |
277a6a34 RK |
476 | if (nilfs_test_opt(sbi, ERRORS_CONT)) |
477 | seq_printf(seq, ",errors=continue"); | |
b58a285b JS |
478 | if (nilfs_test_opt(sbi, STRICT_ORDER)) |
479 | seq_printf(seq, ",order=strict"); | |
0234576d RK |
480 | if (nilfs_test_opt(sbi, NORECOVERY)) |
481 | seq_printf(seq, ",norecovery"); | |
e902ec99 JS |
482 | if (nilfs_test_opt(sbi, DISCARD)) |
483 | seq_printf(seq, ",discard"); | |
b58a285b JS |
484 | |
485 | return 0; | |
486 | } | |
487 | ||
b87221de | 488 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
489 | .alloc_inode = nilfs_alloc_inode, |
490 | .destroy_inode = nilfs_destroy_inode, | |
491 | .dirty_inode = nilfs_dirty_inode, | |
492 | /* .write_inode = nilfs_write_inode, */ | |
493 | /* .put_inode = nilfs_put_inode, */ | |
494 | /* .drop_inode = nilfs_drop_inode, */ | |
495 | .delete_inode = nilfs_delete_inode, | |
496 | .put_super = nilfs_put_super, | |
1dfa2710 | 497 | /* .write_super = nilfs_write_super, */ |
783f6184 RK |
498 | .sync_fs = nilfs_sync_fs, |
499 | /* .write_super_lockfs */ | |
500 | /* .unlockfs */ | |
501 | .statfs = nilfs_statfs, | |
502 | .remount_fs = nilfs_remount, | |
503 | .clear_inode = nilfs_clear_inode, | |
504 | /* .umount_begin */ | |
b58a285b | 505 | .show_options = nilfs_show_options |
783f6184 RK |
506 | }; |
507 | ||
508 | static struct inode * | |
509 | nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation) | |
510 | { | |
511 | struct inode *inode; | |
512 | ||
513 | if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO && | |
514 | ino != NILFS_SKETCH_INO) | |
515 | return ERR_PTR(-ESTALE); | |
516 | ||
517 | inode = nilfs_iget(sb, ino); | |
518 | if (IS_ERR(inode)) | |
519 | return ERR_CAST(inode); | |
520 | if (generation && inode->i_generation != generation) { | |
521 | iput(inode); | |
522 | return ERR_PTR(-ESTALE); | |
523 | } | |
524 | ||
525 | return inode; | |
526 | } | |
527 | ||
528 | static struct dentry * | |
529 | nilfs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, | |
530 | int fh_type) | |
531 | { | |
532 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
533 | nilfs_nfs_get_inode); | |
534 | } | |
535 | ||
536 | static struct dentry * | |
537 | nilfs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, | |
538 | int fh_type) | |
539 | { | |
540 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
541 | nilfs_nfs_get_inode); | |
542 | } | |
543 | ||
ac4cfdd6 | 544 | static const struct export_operations nilfs_export_ops = { |
783f6184 RK |
545 | .fh_to_dentry = nilfs_fh_to_dentry, |
546 | .fh_to_parent = nilfs_fh_to_parent, | |
547 | .get_parent = nilfs_get_parent, | |
548 | }; | |
549 | ||
550 | enum { | |
551 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
0234576d | 552 | Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
e902ec99 | 553 | Opt_discard, Opt_err, |
783f6184 RK |
554 | }; |
555 | ||
556 | static match_table_t tokens = { | |
557 | {Opt_err_cont, "errors=continue"}, | |
558 | {Opt_err_panic, "errors=panic"}, | |
559 | {Opt_err_ro, "errors=remount-ro"}, | |
91f1953b | 560 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
561 | {Opt_snapshot, "cp=%u"}, |
562 | {Opt_order, "order=%s"}, | |
0234576d | 563 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 564 | {Opt_discard, "discard"}, |
783f6184 RK |
565 | {Opt_err, NULL} |
566 | }; | |
567 | ||
783f6184 RK |
568 | static int parse_options(char *options, struct super_block *sb) |
569 | { | |
570 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
571 | char *p; | |
572 | substring_t args[MAX_OPT_ARGS]; | |
573 | int option; | |
574 | ||
575 | if (!options) | |
576 | return 1; | |
577 | ||
578 | while ((p = strsep(&options, ",")) != NULL) { | |
579 | int token; | |
580 | if (!*p) | |
581 | continue; | |
582 | ||
583 | token = match_token(p, tokens, args); | |
584 | switch (token) { | |
91f1953b JS |
585 | case Opt_nobarrier: |
586 | nilfs_clear_opt(sbi, BARRIER); | |
783f6184 RK |
587 | break; |
588 | case Opt_order: | |
589 | if (strcmp(args[0].from, "relaxed") == 0) | |
590 | /* Ordered data semantics */ | |
591 | nilfs_clear_opt(sbi, STRICT_ORDER); | |
592 | else if (strcmp(args[0].from, "strict") == 0) | |
593 | /* Strict in-order semantics */ | |
594 | nilfs_set_opt(sbi, STRICT_ORDER); | |
595 | else | |
596 | return 0; | |
597 | break; | |
598 | case Opt_err_panic: | |
599 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC); | |
600 | break; | |
601 | case Opt_err_ro: | |
602 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO); | |
603 | break; | |
604 | case Opt_err_cont: | |
605 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT); | |
606 | break; | |
607 | case Opt_snapshot: | |
608 | if (match_int(&args[0], &option) || option <= 0) | |
609 | return 0; | |
610 | if (!(sb->s_flags & MS_RDONLY)) | |
611 | return 0; | |
612 | sbi->s_snapshot_cno = option; | |
613 | nilfs_set_opt(sbi, SNAPSHOT); | |
614 | break; | |
0234576d RK |
615 | case Opt_norecovery: |
616 | nilfs_set_opt(sbi, NORECOVERY); | |
617 | break; | |
e902ec99 JS |
618 | case Opt_discard: |
619 | nilfs_set_opt(sbi, DISCARD); | |
620 | break; | |
783f6184 RK |
621 | default: |
622 | printk(KERN_ERR | |
623 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
624 | return 0; | |
625 | } | |
626 | } | |
627 | return 1; | |
628 | } | |
629 | ||
630 | static inline void | |
631 | nilfs_set_default_options(struct nilfs_sb_info *sbi, | |
632 | struct nilfs_super_block *sbp) | |
633 | { | |
634 | sbi->s_mount_opt = | |
277a6a34 | 635 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
636 | } |
637 | ||
638 | static int nilfs_setup_super(struct nilfs_sb_info *sbi) | |
639 | { | |
640 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
e339ad31 | 641 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; |
783f6184 RK |
642 | int max_mnt_count = le16_to_cpu(sbp->s_max_mnt_count); |
643 | int mnt_count = le16_to_cpu(sbp->s_mnt_count); | |
644 | ||
645 | /* nilfs->sem must be locked by the caller. */ | |
f50a4c81 | 646 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
783f6184 RK |
647 | printk(KERN_WARNING |
648 | "NILFS warning: mounting fs with errors\n"); | |
649 | #if 0 | |
650 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
651 | printk(KERN_WARNING | |
652 | "NILFS warning: maximal mount count reached\n"); | |
653 | #endif | |
654 | } | |
655 | if (!max_mnt_count) | |
656 | sbp->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); | |
657 | ||
658 | sbp->s_mnt_count = cpu_to_le16(mnt_count + 1); | |
659 | sbp->s_state = cpu_to_le16(le16_to_cpu(sbp->s_state) & ~NILFS_VALID_FS); | |
660 | sbp->s_mtime = cpu_to_le64(get_seconds()); | |
e339ad31 | 661 | return nilfs_commit_super(sbi, 1); |
783f6184 RK |
662 | } |
663 | ||
e339ad31 RK |
664 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
665 | u64 pos, int blocksize, | |
666 | struct buffer_head **pbh) | |
783f6184 | 667 | { |
e339ad31 RK |
668 | unsigned long long sb_index = pos; |
669 | unsigned long offset; | |
783f6184 | 670 | |
e339ad31 | 671 | offset = do_div(sb_index, blocksize); |
783f6184 | 672 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 673 | if (!*pbh) |
783f6184 | 674 | return NULL; |
783f6184 RK |
675 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
676 | } | |
677 | ||
783f6184 RK |
678 | int nilfs_store_magic_and_option(struct super_block *sb, |
679 | struct nilfs_super_block *sbp, | |
680 | char *data) | |
681 | { | |
682 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
683 | ||
783f6184 RK |
684 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
685 | ||
686 | /* FS independent flags */ | |
687 | #ifdef NILFS_ATIME_DISABLE | |
688 | sb->s_flags |= MS_NOATIME; | |
689 | #endif | |
690 | ||
783f6184 RK |
691 | nilfs_set_default_options(sbi, sbp); |
692 | ||
693 | sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid); | |
694 | sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid); | |
695 | sbi->s_interval = le32_to_cpu(sbp->s_c_interval); | |
696 | sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max); | |
697 | ||
e339ad31 | 698 | return !parse_options(data, sb) ? -EINVAL : 0 ; |
783f6184 RK |
699 | } |
700 | ||
701 | /** | |
702 | * nilfs_fill_super() - initialize a super block instance | |
703 | * @sb: super_block | |
704 | * @data: mount options | |
705 | * @silent: silent mode flag | |
706 | * @nilfs: the_nilfs struct | |
707 | * | |
aa7dfb89 | 708 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
709 | * So, the recovery process is protected from other simultaneous mounts. |
710 | */ | |
711 | static int | |
712 | nilfs_fill_super(struct super_block *sb, void *data, int silent, | |
713 | struct the_nilfs *nilfs) | |
714 | { | |
715 | struct nilfs_sb_info *sbi; | |
716 | struct inode *root; | |
717 | __u64 cno; | |
718 | int err; | |
719 | ||
720 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
721 | if (!sbi) | |
722 | return -ENOMEM; | |
723 | ||
724 | sb->s_fs_info = sbi; | |
725 | ||
726 | get_nilfs(nilfs); | |
727 | sbi->s_nilfs = nilfs; | |
728 | sbi->s_super = sb; | |
6dd47406 | 729 | atomic_set(&sbi->s_count, 1); |
783f6184 RK |
730 | |
731 | err = init_nilfs(nilfs, sbi, (char *)data); | |
732 | if (err) | |
733 | goto failed_sbi; | |
734 | ||
735 | spin_lock_init(&sbi->s_inode_lock); | |
736 | INIT_LIST_HEAD(&sbi->s_dirty_files); | |
737 | INIT_LIST_HEAD(&sbi->s_list); | |
738 | ||
739 | /* | |
740 | * Following initialization is overlapped because | |
741 | * nilfs_sb_info structure has been cleared at the beginning. | |
742 | * But we reserve them to keep our interest and make ready | |
743 | * for the future change. | |
744 | */ | |
745 | get_random_bytes(&sbi->s_next_generation, | |
746 | sizeof(sbi->s_next_generation)); | |
747 | spin_lock_init(&sbi->s_next_gen_lock); | |
748 | ||
749 | sb->s_op = &nilfs_sops; | |
750 | sb->s_export_op = &nilfs_export_ops; | |
751 | sb->s_root = NULL; | |
61239230 | 752 | sb->s_time_gran = 1; |
973bec34 | 753 | sb->s_bdi = nilfs->ns_bdi; |
783f6184 | 754 | |
f50a4c81 RK |
755 | err = load_nilfs(nilfs, sbi); |
756 | if (err) | |
757 | goto failed_sbi; | |
758 | ||
783f6184 RK |
759 | cno = nilfs_last_cno(nilfs); |
760 | ||
761 | if (sb->s_flags & MS_RDONLY) { | |
762 | if (nilfs_test_opt(sbi, SNAPSHOT)) { | |
43be0ec0 | 763 | down_read(&nilfs->ns_segctor_sem); |
1f5abe7e RK |
764 | err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, |
765 | sbi->s_snapshot_cno); | |
43be0ec0 ZY |
766 | up_read(&nilfs->ns_segctor_sem); |
767 | if (err < 0) { | |
768 | if (err == -ENOENT) | |
769 | err = -EINVAL; | |
1f5abe7e | 770 | goto failed_sbi; |
43be0ec0 | 771 | } |
1f5abe7e | 772 | if (!err) { |
783f6184 RK |
773 | printk(KERN_ERR |
774 | "NILFS: The specified checkpoint is " | |
775 | "not a snapshot " | |
776 | "(checkpoint number=%llu).\n", | |
777 | (unsigned long long)sbi->s_snapshot_cno); | |
778 | err = -EINVAL; | |
779 | goto failed_sbi; | |
780 | } | |
781 | cno = sbi->s_snapshot_cno; | |
d240e067 | 782 | } |
783f6184 RK |
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); | |
783f6184 RK |
847 | struct the_nilfs *nilfs = sbi->s_nilfs; |
848 | unsigned long old_sb_flags; | |
849 | struct nilfs_mount_options old_opts; | |
d240e067 | 850 | int was_snapshot, err; |
783f6184 | 851 | |
337eb00a AIB |
852 | lock_kernel(); |
853 | ||
e59399d0 | 854 | down_write(&nilfs->ns_super_sem); |
783f6184 RK |
855 | old_sb_flags = sb->s_flags; |
856 | old_opts.mount_opt = sbi->s_mount_opt; | |
857 | old_opts.snapshot_cno = sbi->s_snapshot_cno; | |
d240e067 | 858 | was_snapshot = nilfs_test_opt(sbi, SNAPSHOT); |
783f6184 RK |
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 | ||
d240e067 RK |
866 | err = -EINVAL; |
867 | if (was_snapshot) { | |
868 | if (!(*flags & MS_RDONLY)) { | |
869 | printk(KERN_ERR "NILFS (device %s): cannot remount " | |
870 | "snapshot read/write.\n", | |
871 | sb->s_id); | |
872 | goto restore_opts; | |
873 | } else if (sbi->s_snapshot_cno != old_opts.snapshot_cno) { | |
874 | printk(KERN_ERR "NILFS (device %s): cannot " | |
875 | "remount to a different snapshot.\n", | |
876 | sb->s_id); | |
877 | goto restore_opts; | |
878 | } | |
879 | } else { | |
880 | if (nilfs_test_opt(sbi, SNAPSHOT)) { | |
881 | printk(KERN_ERR "NILFS (device %s): cannot change " | |
882 | "a regular mount to a snapshot.\n", | |
883 | sb->s_id); | |
884 | goto restore_opts; | |
885 | } | |
783f6184 RK |
886 | } |
887 | ||
0234576d RK |
888 | if (!nilfs_valid_fs(nilfs)) { |
889 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
890 | "remount because the filesystem is in an " | |
891 | "incomplete recovery state.\n", sb->s_id); | |
0234576d RK |
892 | goto restore_opts; |
893 | } | |
894 | ||
783f6184 RK |
895 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
896 | goto out; | |
897 | if (*flags & MS_RDONLY) { | |
898 | /* Shutting down the segment constructor */ | |
899 | nilfs_detach_segment_constructor(sbi); | |
900 | sb->s_flags |= MS_RDONLY; | |
901 | ||
783f6184 RK |
902 | /* |
903 | * Remounting a valid RW partition RDONLY, so set | |
904 | * the RDONLY flag and then mark the partition as valid again. | |
905 | */ | |
906 | down_write(&nilfs->ns_sem); | |
7ecaa46c | 907 | nilfs_cleanup_super(sbi); |
783f6184 RK |
908 | up_write(&nilfs->ns_sem); |
909 | } else { | |
910 | /* | |
911 | * Mounting a RDONLY partition read-write, so reread and | |
912 | * store the current valid flag. (It may have been changed | |
913 | * by fsck since we originally mounted the partition.) | |
914 | */ | |
783f6184 | 915 | sb->s_flags &= ~MS_RDONLY; |
783f6184 | 916 | |
cece5520 | 917 | err = nilfs_attach_segment_constructor(sbi); |
783f6184 | 918 | if (err) |
e59399d0 | 919 | goto restore_opts; |
783f6184 RK |
920 | |
921 | down_write(&nilfs->ns_sem); | |
922 | nilfs_setup_super(sbi); | |
923 | up_write(&nilfs->ns_sem); | |
783f6184 RK |
924 | } |
925 | out: | |
e59399d0 | 926 | up_write(&nilfs->ns_super_sem); |
337eb00a | 927 | unlock_kernel(); |
783f6184 RK |
928 | return 0; |
929 | ||
783f6184 RK |
930 | restore_opts: |
931 | sb->s_flags = old_sb_flags; | |
932 | sbi->s_mount_opt = old_opts.mount_opt; | |
933 | sbi->s_snapshot_cno = old_opts.snapshot_cno; | |
e59399d0 | 934 | up_write(&nilfs->ns_super_sem); |
337eb00a | 935 | unlock_kernel(); |
783f6184 RK |
936 | return err; |
937 | } | |
938 | ||
939 | struct nilfs_super_data { | |
940 | struct block_device *bdev; | |
6dd47406 | 941 | struct nilfs_sb_info *sbi; |
783f6184 RK |
942 | __u64 cno; |
943 | int flags; | |
944 | }; | |
945 | ||
946 | /** | |
947 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
948 | * @data: mount options | |
949 | * @sd: nilfs_super_data | |
950 | */ | |
951 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
952 | { | |
953 | char *p, *options = data; | |
954 | substring_t args[MAX_OPT_ARGS]; | |
955 | int option, token; | |
956 | int ret = 0; | |
957 | ||
958 | do { | |
959 | p = strsep(&options, ","); | |
960 | if (p != NULL && *p) { | |
961 | token = match_token(p, tokens, args); | |
962 | if (token == Opt_snapshot) { | |
963 | if (!(sd->flags & MS_RDONLY)) | |
964 | ret++; | |
965 | else { | |
966 | ret = match_int(&args[0], &option); | |
967 | if (!ret) { | |
968 | if (option > 0) | |
969 | sd->cno = option; | |
970 | else | |
971 | ret++; | |
972 | } | |
973 | } | |
974 | } | |
975 | if (ret) | |
976 | printk(KERN_ERR | |
977 | "NILFS: invalid mount option: %s\n", p); | |
978 | } | |
979 | if (!options) | |
980 | break; | |
981 | BUG_ON(options == data); | |
982 | *(options - 1) = ','; | |
983 | } while (!ret); | |
984 | return ret; | |
985 | } | |
986 | ||
987 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
988 | { | |
989 | struct nilfs_super_data *sd = data; | |
990 | ||
991 | s->s_bdev = sd->bdev; | |
992 | s->s_dev = s->s_bdev->bd_dev; | |
993 | return 0; | |
994 | } | |
995 | ||
996 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 RK |
997 | { |
998 | struct nilfs_super_data *sd = data; | |
6dd47406 RK |
999 | |
1000 | return sd->sbi && s->s_fs_info == (void *)sd->sbi; | |
783f6184 RK |
1001 | } |
1002 | ||
1003 | static int | |
1004 | nilfs_get_sb(struct file_system_type *fs_type, int flags, | |
1005 | const char *dev_name, void *data, struct vfsmount *mnt) | |
1006 | { | |
1007 | struct nilfs_super_data sd; | |
33c8e57c | 1008 | struct super_block *s; |
13e90559 | 1009 | fmode_t mode = FMODE_READ; |
33c8e57c | 1010 | struct the_nilfs *nilfs; |
783f6184 RK |
1011 | int err, need_to_close = 1; |
1012 | ||
13e90559 RK |
1013 | if (!(flags & MS_RDONLY)) |
1014 | mode |= FMODE_WRITE; | |
1015 | ||
1016 | sd.bdev = open_bdev_exclusive(dev_name, mode, fs_type); | |
783f6184 RK |
1017 | if (IS_ERR(sd.bdev)) |
1018 | return PTR_ERR(sd.bdev); | |
1019 | ||
1020 | /* | |
1021 | * To get mount instance using sget() vfs-routine, NILFS needs | |
1022 | * much more information than normal filesystems to identify mount | |
1023 | * instance. For snapshot mounts, not only a mount type (ro-mount | |
1024 | * or rw-mount) but also a checkpoint number is required. | |
783f6184 RK |
1025 | */ |
1026 | sd.cno = 0; | |
1027 | sd.flags = flags; | |
1028 | if (nilfs_identify((char *)data, &sd)) { | |
1029 | err = -EINVAL; | |
1030 | goto failed; | |
1031 | } | |
1032 | ||
33c8e57c RK |
1033 | nilfs = find_or_create_nilfs(sd.bdev); |
1034 | if (!nilfs) { | |
1035 | err = -ENOMEM; | |
1036 | goto failed; | |
1037 | } | |
1038 | ||
aa7dfb89 | 1039 | mutex_lock(&nilfs->ns_mount_mutex); |
3f82ff55 RK |
1040 | |
1041 | if (!sd.cno) { | |
1042 | /* | |
1043 | * Check if an exclusive mount exists or not. | |
1044 | * Snapshot mounts coexist with a current mount | |
1045 | * (i.e. rw-mount or ro-mount), whereas rw-mount and | |
1046 | * ro-mount are mutually exclusive. | |
1047 | */ | |
e59399d0 | 1048 | down_read(&nilfs->ns_super_sem); |
3f82ff55 RK |
1049 | if (nilfs->ns_current && |
1050 | ((nilfs->ns_current->s_super->s_flags ^ flags) | |
1051 | & MS_RDONLY)) { | |
e59399d0 | 1052 | up_read(&nilfs->ns_super_sem); |
3f82ff55 RK |
1053 | err = -EBUSY; |
1054 | goto failed_unlock; | |
1055 | } | |
e59399d0 | 1056 | up_read(&nilfs->ns_super_sem); |
783f6184 RK |
1057 | } |
1058 | ||
1059 | /* | |
6dd47406 | 1060 | * Find existing nilfs_sb_info struct |
783f6184 | 1061 | */ |
6dd47406 RK |
1062 | sd.sbi = nilfs_find_sbinfo(nilfs, !(flags & MS_RDONLY), sd.cno); |
1063 | ||
6dd47406 RK |
1064 | /* |
1065 | * Get super block instance holding the nilfs_sb_info struct. | |
1066 | * A new instance is allocated if no existing mount is present or | |
1067 | * existing instance has been unmounted. | |
1068 | */ | |
33c8e57c | 1069 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, &sd); |
6dd47406 RK |
1070 | if (sd.sbi) |
1071 | nilfs_put_sbinfo(sd.sbi); | |
1072 | ||
33c8e57c RK |
1073 | if (IS_ERR(s)) { |
1074 | err = PTR_ERR(s); | |
1075 | goto failed_unlock; | |
783f6184 RK |
1076 | } |
1077 | ||
1078 | if (!s->s_root) { | |
1079 | char b[BDEVNAME_SIZE]; | |
1080 | ||
33c8e57c | 1081 | /* New superblock instance created */ |
783f6184 | 1082 | s->s_flags = flags; |
4571b82c | 1083 | s->s_mode = mode; |
783f6184 RK |
1084 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); |
1085 | sb_set_blocksize(s, block_size(sd.bdev)); | |
1086 | ||
e2d1591a RK |
1087 | err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0, |
1088 | nilfs); | |
783f6184 RK |
1089 | if (err) |
1090 | goto cancel_new; | |
1091 | ||
1092 | s->s_flags |= MS_ACTIVE; | |
1093 | need_to_close = 0; | |
783f6184 RK |
1094 | } |
1095 | ||
aa7dfb89 | 1096 | mutex_unlock(&nilfs->ns_mount_mutex); |
783f6184 RK |
1097 | put_nilfs(nilfs); |
1098 | if (need_to_close) | |
13e90559 | 1099 | close_bdev_exclusive(sd.bdev, mode); |
783f6184 RK |
1100 | simple_set_mnt(mnt, s); |
1101 | return 0; | |
1102 | ||
783f6184 | 1103 | failed_unlock: |
aa7dfb89 | 1104 | mutex_unlock(&nilfs->ns_mount_mutex); |
33c8e57c | 1105 | put_nilfs(nilfs); |
783f6184 | 1106 | failed: |
13e90559 | 1107 | close_bdev_exclusive(sd.bdev, mode); |
783f6184 RK |
1108 | |
1109 | return err; | |
1110 | ||
1111 | cancel_new: | |
1112 | /* Abandoning the newly allocated superblock */ | |
aa7dfb89 | 1113 | mutex_unlock(&nilfs->ns_mount_mutex); |
33c8e57c | 1114 | put_nilfs(nilfs); |
a95161aa | 1115 | deactivate_locked_super(s); |
783f6184 | 1116 | /* |
b87ca919 | 1117 | * deactivate_locked_super() invokes close_bdev_exclusive(). |
783f6184 | 1118 | * We must finish all post-cleaning before this call; |
aa7dfb89 | 1119 | * put_nilfs() needs the block device. |
783f6184 RK |
1120 | */ |
1121 | return err; | |
1122 | } | |
1123 | ||
783f6184 RK |
1124 | struct file_system_type nilfs_fs_type = { |
1125 | .owner = THIS_MODULE, | |
1126 | .name = "nilfs2", | |
1127 | .get_sb = nilfs_get_sb, | |
1128 | .kill_sb = kill_block_super, | |
1129 | .fs_flags = FS_REQUIRES_DEV, | |
1130 | }; | |
1131 | ||
41c88bd7 | 1132 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1133 | { |
41c88bd7 | 1134 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1135 | |
41c88bd7 LH |
1136 | INIT_LIST_HEAD(&ii->i_dirty); |
1137 | #ifdef CONFIG_NILFS_XATTR | |
1138 | init_rwsem(&ii->xattr_sem); | |
1139 | #endif | |
1140 | nilfs_btnode_cache_init_once(&ii->i_btnode_cache); | |
1141 | ii->i_bmap = (struct nilfs_bmap *)&ii->i_bmap_union; | |
1142 | inode_init_once(&ii->vfs_inode); | |
1143 | } | |
783f6184 | 1144 | |
41c88bd7 LH |
1145 | static void nilfs_segbuf_init_once(void *obj) |
1146 | { | |
1147 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1148 | } | |
783f6184 | 1149 | |
41c88bd7 LH |
1150 | static void nilfs_destroy_cachep(void) |
1151 | { | |
84cb0999 | 1152 | if (nilfs_inode_cachep) |
41c88bd7 | 1153 | kmem_cache_destroy(nilfs_inode_cachep); |
84cb0999 | 1154 | if (nilfs_transaction_cachep) |
41c88bd7 | 1155 | kmem_cache_destroy(nilfs_transaction_cachep); |
84cb0999 | 1156 | if (nilfs_segbuf_cachep) |
41c88bd7 | 1157 | kmem_cache_destroy(nilfs_segbuf_cachep); |
84cb0999 | 1158 | if (nilfs_btree_path_cache) |
41c88bd7 LH |
1159 | kmem_cache_destroy(nilfs_btree_path_cache); |
1160 | } | |
783f6184 | 1161 | |
41c88bd7 LH |
1162 | static int __init nilfs_init_cachep(void) |
1163 | { | |
1164 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1165 | sizeof(struct nilfs_inode_info), 0, | |
1166 | SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once); | |
1167 | if (!nilfs_inode_cachep) | |
1168 | goto fail; | |
1169 | ||
1170 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1171 | sizeof(struct nilfs_transaction_info), 0, | |
1172 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1173 | if (!nilfs_transaction_cachep) | |
1174 | goto fail; | |
1175 | ||
1176 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1177 | sizeof(struct nilfs_segment_buffer), 0, | |
1178 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1179 | if (!nilfs_segbuf_cachep) | |
1180 | goto fail; | |
1181 | ||
1182 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1183 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1184 | 0, 0, NULL); | |
1185 | if (!nilfs_btree_path_cache) | |
1186 | goto fail; | |
783f6184 RK |
1187 | |
1188 | return 0; | |
1189 | ||
41c88bd7 LH |
1190 | fail: |
1191 | nilfs_destroy_cachep(); | |
1192 | return -ENOMEM; | |
1193 | } | |
1194 | ||
1195 | static int __init init_nilfs_fs(void) | |
1196 | { | |
1197 | int err; | |
783f6184 | 1198 | |
41c88bd7 LH |
1199 | err = nilfs_init_cachep(); |
1200 | if (err) | |
1201 | goto fail; | |
783f6184 | 1202 | |
41c88bd7 LH |
1203 | err = register_filesystem(&nilfs_fs_type); |
1204 | if (err) | |
1205 | goto free_cachep; | |
783f6184 | 1206 | |
9f130263 | 1207 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1208 | return 0; |
783f6184 | 1209 | |
41c88bd7 LH |
1210 | free_cachep: |
1211 | nilfs_destroy_cachep(); | |
1212 | fail: | |
783f6184 RK |
1213 | return err; |
1214 | } | |
1215 | ||
1216 | static void __exit exit_nilfs_fs(void) | |
1217 | { | |
41c88bd7 | 1218 | nilfs_destroy_cachep(); |
783f6184 RK |
1219 | unregister_filesystem(&nilfs_fs_type); |
1220 | } | |
1221 | ||
1222 | module_init(init_nilfs_fs) | |
1223 | module_exit(exit_nilfs_fs) |