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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> | |
783f6184 | 46 | #include <linux/crc32.h> |
783f6184 RK |
47 | #include <linux/vfs.h> |
48 | #include <linux/writeback.h> | |
b58a285b JS |
49 | #include <linux/seq_file.h> |
50 | #include <linux/mount.h> | |
783f6184 | 51 | #include "nilfs.h" |
8e656fd5 | 52 | #include "export.h" |
783f6184 RK |
53 | #include "mdt.h" |
54 | #include "alloc.h" | |
05d0e94b RK |
55 | #include "btree.h" |
56 | #include "btnode.h" | |
783f6184 RK |
57 | #include "page.h" |
58 | #include "cpfile.h" | |
4e33f9ea | 59 | #include "sufile.h" /* nilfs_sufile_resize(), nilfs_sufile_set_alloc_range() */ |
783f6184 RK |
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 | ||
abc0b50b | 70 | static struct kmem_cache *nilfs_inode_cachep; |
41c88bd7 LH |
71 | struct kmem_cache *nilfs_transaction_cachep; |
72 | struct kmem_cache *nilfs_segbuf_cachep; | |
73 | struct kmem_cache *nilfs_btree_path_cache; | |
74 | ||
f7545144 | 75 | static int nilfs_setup_super(struct super_block *sb, int is_mount); |
783f6184 | 76 | static int nilfs_remount(struct super_block *sb, int *flags, char *data); |
783f6184 | 77 | |
f7545144 | 78 | static void nilfs_set_error(struct super_block *sb) |
c8a11c8a | 79 | { |
e3154e97 | 80 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 81 | struct nilfs_super_block **sbp; |
c8a11c8a RK |
82 | |
83 | down_write(&nilfs->ns_sem); | |
84 | if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { | |
85 | nilfs->ns_mount_state |= NILFS_ERROR_FS; | |
f7545144 | 86 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 JS |
87 | if (likely(sbp)) { |
88 | sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
b2ac86e1 JS |
89 | if (sbp[1]) |
90 | sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
f7545144 | 91 | nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); |
d26493b6 | 92 | } |
c8a11c8a RK |
93 | } |
94 | up_write(&nilfs->ns_sem); | |
95 | } | |
96 | ||
783f6184 RK |
97 | /** |
98 | * nilfs_error() - report failure condition on a filesystem | |
99 | * | |
100 | * nilfs_error() sets an ERROR_FS flag on the superblock as well as | |
101 | * reporting an error message. It should be called when NILFS detects | |
102 | * incoherences or defects of meta data on disk. As for sustainable | |
103 | * errors such as a single-shot I/O error, nilfs_warning() or the printk() | |
104 | * function should be used instead. | |
105 | * | |
106 | * The segment constructor must not call this function because it can | |
107 | * kill itself. | |
108 | */ | |
109 | void nilfs_error(struct super_block *sb, const char *function, | |
110 | const char *fmt, ...) | |
111 | { | |
e3154e97 | 112 | struct the_nilfs *nilfs = sb->s_fs_info; |
b004a5eb | 113 | struct va_format vaf; |
783f6184 RK |
114 | va_list args; |
115 | ||
116 | va_start(args, fmt); | |
b004a5eb JP |
117 | |
118 | vaf.fmt = fmt; | |
119 | vaf.va = &args; | |
120 | ||
121 | printk(KERN_CRIT "NILFS error (device %s): %s: %pV\n", | |
122 | sb->s_id, function, &vaf); | |
123 | ||
783f6184 RK |
124 | va_end(args); |
125 | ||
126 | if (!(sb->s_flags & MS_RDONLY)) { | |
f7545144 | 127 | nilfs_set_error(sb); |
783f6184 | 128 | |
3b2ce58b | 129 | if (nilfs_test_opt(nilfs, ERRORS_RO)) { |
783f6184 RK |
130 | printk(KERN_CRIT "Remounting filesystem read-only\n"); |
131 | sb->s_flags |= MS_RDONLY; | |
132 | } | |
133 | } | |
134 | ||
3b2ce58b | 135 | if (nilfs_test_opt(nilfs, ERRORS_PANIC)) |
783f6184 RK |
136 | panic("NILFS (device %s): panic forced after error\n", |
137 | sb->s_id); | |
138 | } | |
139 | ||
140 | void nilfs_warning(struct super_block *sb, const char *function, | |
141 | const char *fmt, ...) | |
142 | { | |
b004a5eb | 143 | struct va_format vaf; |
783f6184 RK |
144 | va_list args; |
145 | ||
146 | va_start(args, fmt); | |
b004a5eb JP |
147 | |
148 | vaf.fmt = fmt; | |
149 | vaf.va = &args; | |
150 | ||
151 | printk(KERN_WARNING "NILFS warning (device %s): %s: %pV\n", | |
152 | sb->s_id, function, &vaf); | |
153 | ||
783f6184 RK |
154 | va_end(args); |
155 | } | |
156 | ||
783f6184 | 157 | |
2879ed66 | 158 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
783f6184 RK |
159 | { |
160 | struct nilfs_inode_info *ii; | |
161 | ||
162 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); | |
163 | if (!ii) | |
164 | return NULL; | |
165 | ii->i_bh = NULL; | |
166 | ii->i_state = 0; | |
0e14a359 | 167 | ii->i_cno = 0; |
783f6184 | 168 | ii->vfs_inode.i_version = 1; |
aa405b1f | 169 | nilfs_mapping_init(&ii->i_btnode_cache, &ii->vfs_inode, sb->s_bdi); |
783f6184 RK |
170 | return &ii->vfs_inode; |
171 | } | |
172 | ||
fa0d7e3d | 173 | static void nilfs_i_callback(struct rcu_head *head) |
783f6184 | 174 | { |
fa0d7e3d | 175 | struct inode *inode = container_of(head, struct inode, i_rcu); |
b91c9a97 RK |
176 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
177 | ||
178 | if (mdi) { | |
179 | kfree(mdi->mi_bgl); /* kfree(NULL) is safe */ | |
180 | kfree(mdi); | |
181 | } | |
783f6184 RK |
182 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
183 | } | |
184 | ||
fa0d7e3d NP |
185 | void nilfs_destroy_inode(struct inode *inode) |
186 | { | |
187 | call_rcu(&inode->i_rcu, nilfs_i_callback); | |
188 | } | |
189 | ||
f7545144 | 190 | static int nilfs_sync_super(struct super_block *sb, int flag) |
783f6184 | 191 | { |
e3154e97 | 192 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 193 | int err; |
783f6184 | 194 | |
783f6184 | 195 | retry: |
e339ad31 | 196 | set_buffer_dirty(nilfs->ns_sbh[0]); |
3b2ce58b | 197 | if (nilfs_test_opt(nilfs, BARRIER)) { |
87e99511 | 198 | err = __sync_dirty_buffer(nilfs->ns_sbh[0], |
f8c131f5 | 199 | WRITE_SYNC | WRITE_FLUSH_FUA); |
87e99511 CH |
200 | } else { |
201 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); | |
783f6184 | 202 | } |
87e99511 | 203 | |
e339ad31 | 204 | if (unlikely(err)) { |
783f6184 RK |
205 | printk(KERN_ERR |
206 | "NILFS: unable to write superblock (err=%d)\n", err); | |
e339ad31 | 207 | if (err == -EIO && nilfs->ns_sbh[1]) { |
b2ac86e1 JS |
208 | /* |
209 | * sbp[0] points to newer log than sbp[1], | |
210 | * so copy sbp[0] to sbp[1] to take over sbp[0]. | |
211 | */ | |
212 | memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0], | |
213 | nilfs->ns_sbsize); | |
e339ad31 RK |
214 | nilfs_fall_back_super_block(nilfs); |
215 | goto retry; | |
216 | } | |
217 | } else { | |
218 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; | |
219 | ||
b2ac86e1 JS |
220 | nilfs->ns_sbwcount++; |
221 | ||
e339ad31 RK |
222 | /* |
223 | * The latest segment becomes trailable from the position | |
224 | * written in superblock. | |
225 | */ | |
783f6184 | 226 | clear_nilfs_discontinued(nilfs); |
e339ad31 RK |
227 | |
228 | /* update GC protection for recent segments */ | |
229 | if (nilfs->ns_sbh[1]) { | |
b2ac86e1 | 230 | if (flag == NILFS_SB_COMMIT_ALL) { |
e339ad31 | 231 | set_buffer_dirty(nilfs->ns_sbh[1]); |
b2ac86e1 JS |
232 | if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0) |
233 | goto out; | |
e339ad31 | 234 | } |
b2ac86e1 JS |
235 | if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) < |
236 | le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno)) | |
237 | sbp = nilfs->ns_sbp[1]; | |
e339ad31 | 238 | } |
783f6184 | 239 | |
b2ac86e1 JS |
240 | spin_lock(&nilfs->ns_last_segment_lock); |
241 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); | |
242 | spin_unlock(&nilfs->ns_last_segment_lock); | |
243 | } | |
244 | out: | |
783f6184 RK |
245 | return err; |
246 | } | |
247 | ||
60f46b7e RK |
248 | void nilfs_set_log_cursor(struct nilfs_super_block *sbp, |
249 | struct the_nilfs *nilfs) | |
250 | { | |
251 | sector_t nfreeblocks; | |
252 | ||
253 | /* nilfs->ns_sem must be locked by the caller. */ | |
254 | nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
255 | sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
256 | ||
257 | spin_lock(&nilfs->ns_last_segment_lock); | |
258 | sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
259 | sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
260 | sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
261 | spin_unlock(&nilfs->ns_last_segment_lock); | |
262 | } | |
263 | ||
f7545144 | 264 | struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb, |
b2ac86e1 | 265 | int flip) |
783f6184 | 266 | { |
e3154e97 | 267 | struct the_nilfs *nilfs = sb->s_fs_info; |
e339ad31 | 268 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 269 | |
d26493b6 | 270 | /* nilfs->ns_sem must be locked by the caller. */ |
34cb9b5c | 271 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
d26493b6 JS |
272 | if (sbp[1] && |
273 | sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
b2ac86e1 | 274 | memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); |
d26493b6 | 275 | } else { |
e339ad31 | 276 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", |
f7545144 | 277 | sb->s_id); |
d26493b6 | 278 | return NULL; |
e339ad31 | 279 | } |
b2ac86e1 JS |
280 | } else if (sbp[1] && |
281 | sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
282 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
e339ad31 | 283 | } |
b2ac86e1 JS |
284 | |
285 | if (flip && sbp[1]) | |
286 | nilfs_swap_super_block(nilfs); | |
287 | ||
d26493b6 JS |
288 | return sbp; |
289 | } | |
290 | ||
f7545144 | 291 | int nilfs_commit_super(struct super_block *sb, int flag) |
d26493b6 | 292 | { |
e3154e97 | 293 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 JS |
294 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
295 | time_t t; | |
296 | ||
297 | /* nilfs->ns_sem must be locked by the caller. */ | |
e339ad31 | 298 | t = get_seconds(); |
b2ac86e1 | 299 | nilfs->ns_sbwtime = t; |
e339ad31 RK |
300 | sbp[0]->s_wtime = cpu_to_le64(t); |
301 | sbp[0]->s_sum = 0; | |
302 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
303 | (unsigned char *)sbp[0], | |
304 | nilfs->ns_sbsize)); | |
b2ac86e1 JS |
305 | if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) { |
306 | sbp[1]->s_wtime = sbp[0]->s_wtime; | |
307 | sbp[1]->s_sum = 0; | |
308 | sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
309 | (unsigned char *)sbp[1], | |
310 | nilfs->ns_sbsize)); | |
e339ad31 | 311 | } |
e605f0a7 | 312 | clear_nilfs_sb_dirty(nilfs); |
e2c7617a AR |
313 | nilfs->ns_flushed_device = 1; |
314 | /* make sure store to ns_flushed_device cannot be reordered */ | |
315 | smp_wmb(); | |
f7545144 | 316 | return nilfs_sync_super(sb, flag); |
783f6184 RK |
317 | } |
318 | ||
7ecaa46c RK |
319 | /** |
320 | * nilfs_cleanup_super() - write filesystem state for cleanup | |
f7545144 | 321 | * @sb: super block instance to be unmounted or degraded to read-only |
7ecaa46c RK |
322 | * |
323 | * This function restores state flags in the on-disk super block. | |
324 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the | |
325 | * filesystem was not clean previously. | |
326 | */ | |
f7545144 | 327 | int nilfs_cleanup_super(struct super_block *sb) |
7ecaa46c | 328 | { |
e3154e97 | 329 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 330 | struct nilfs_super_block **sbp; |
b2ac86e1 | 331 | int flag = NILFS_SB_COMMIT; |
d26493b6 | 332 | int ret = -EIO; |
7ecaa46c | 333 | |
f7545144 | 334 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 | 335 | if (sbp) { |
f7545144 RK |
336 | sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state); |
337 | nilfs_set_log_cursor(sbp[0], nilfs); | |
b2ac86e1 JS |
338 | if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { |
339 | /* | |
340 | * make the "clean" flag also to the opposite | |
341 | * super block if both super blocks point to | |
342 | * the same checkpoint. | |
343 | */ | |
344 | sbp[1]->s_state = sbp[0]->s_state; | |
345 | flag = NILFS_SB_COMMIT_ALL; | |
346 | } | |
f7545144 | 347 | ret = nilfs_commit_super(sb, flag); |
d26493b6 | 348 | } |
7ecaa46c RK |
349 | return ret; |
350 | } | |
351 | ||
cfb0a4bf RK |
352 | /** |
353 | * nilfs_move_2nd_super - relocate secondary super block | |
354 | * @sb: super block instance | |
355 | * @sb2off: new offset of the secondary super block (in bytes) | |
356 | */ | |
357 | static int nilfs_move_2nd_super(struct super_block *sb, loff_t sb2off) | |
358 | { | |
359 | struct the_nilfs *nilfs = sb->s_fs_info; | |
360 | struct buffer_head *nsbh; | |
361 | struct nilfs_super_block *nsbp; | |
362 | sector_t blocknr, newblocknr; | |
363 | unsigned long offset; | |
364 | int sb2i = -1; /* array index of the secondary superblock */ | |
365 | int ret = 0; | |
366 | ||
367 | /* nilfs->ns_sem must be locked by the caller. */ | |
368 | if (nilfs->ns_sbh[1] && | |
369 | nilfs->ns_sbh[1]->b_blocknr > nilfs->ns_first_data_block) { | |
370 | sb2i = 1; | |
371 | blocknr = nilfs->ns_sbh[1]->b_blocknr; | |
372 | } else if (nilfs->ns_sbh[0]->b_blocknr > nilfs->ns_first_data_block) { | |
373 | sb2i = 0; | |
374 | blocknr = nilfs->ns_sbh[0]->b_blocknr; | |
375 | } | |
376 | if (sb2i >= 0 && (u64)blocknr << nilfs->ns_blocksize_bits == sb2off) | |
377 | goto out; /* super block location is unchanged */ | |
378 | ||
379 | /* Get new super block buffer */ | |
380 | newblocknr = sb2off >> nilfs->ns_blocksize_bits; | |
381 | offset = sb2off & (nilfs->ns_blocksize - 1); | |
382 | nsbh = sb_getblk(sb, newblocknr); | |
383 | if (!nsbh) { | |
384 | printk(KERN_WARNING | |
385 | "NILFS warning: unable to move secondary superblock " | |
386 | "to block %llu\n", (unsigned long long)newblocknr); | |
387 | ret = -EIO; | |
388 | goto out; | |
389 | } | |
390 | nsbp = (void *)nsbh->b_data + offset; | |
391 | memset(nsbp, 0, nilfs->ns_blocksize); | |
392 | ||
393 | if (sb2i >= 0) { | |
394 | memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize); | |
395 | brelse(nilfs->ns_sbh[sb2i]); | |
396 | nilfs->ns_sbh[sb2i] = nsbh; | |
397 | nilfs->ns_sbp[sb2i] = nsbp; | |
398 | } else if (nilfs->ns_sbh[0]->b_blocknr < nilfs->ns_first_data_block) { | |
399 | /* secondary super block will be restored to index 1 */ | |
400 | nilfs->ns_sbh[1] = nsbh; | |
401 | nilfs->ns_sbp[1] = nsbp; | |
402 | } else { | |
403 | brelse(nsbh); | |
404 | } | |
405 | out: | |
406 | return ret; | |
407 | } | |
408 | ||
4e33f9ea RK |
409 | /** |
410 | * nilfs_resize_fs - resize the filesystem | |
411 | * @sb: super block instance | |
412 | * @newsize: new size of the filesystem (in bytes) | |
413 | */ | |
414 | int nilfs_resize_fs(struct super_block *sb, __u64 newsize) | |
415 | { | |
416 | struct the_nilfs *nilfs = sb->s_fs_info; | |
417 | struct nilfs_super_block **sbp; | |
418 | __u64 devsize, newnsegs; | |
419 | loff_t sb2off; | |
420 | int ret; | |
421 | ||
422 | ret = -ERANGE; | |
423 | devsize = i_size_read(sb->s_bdev->bd_inode); | |
424 | if (newsize > devsize) | |
425 | goto out; | |
426 | ||
427 | /* | |
428 | * Write lock is required to protect some functions depending | |
429 | * on the number of segments, the number of reserved segments, | |
430 | * and so forth. | |
431 | */ | |
432 | down_write(&nilfs->ns_segctor_sem); | |
433 | ||
434 | sb2off = NILFS_SB2_OFFSET_BYTES(newsize); | |
435 | newnsegs = sb2off >> nilfs->ns_blocksize_bits; | |
436 | do_div(newnsegs, nilfs->ns_blocks_per_segment); | |
437 | ||
438 | ret = nilfs_sufile_resize(nilfs->ns_sufile, newnsegs); | |
439 | up_write(&nilfs->ns_segctor_sem); | |
440 | if (ret < 0) | |
441 | goto out; | |
442 | ||
443 | ret = nilfs_construct_segment(sb); | |
444 | if (ret < 0) | |
445 | goto out; | |
446 | ||
447 | down_write(&nilfs->ns_sem); | |
448 | nilfs_move_2nd_super(sb, sb2off); | |
449 | ret = -EIO; | |
450 | sbp = nilfs_prepare_super(sb, 0); | |
451 | if (likely(sbp)) { | |
452 | nilfs_set_log_cursor(sbp[0], nilfs); | |
453 | /* | |
454 | * Drop NILFS_RESIZE_FS flag for compatibility with | |
455 | * mount-time resize which may be implemented in a | |
456 | * future release. | |
457 | */ | |
458 | sbp[0]->s_state = cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & | |
459 | ~NILFS_RESIZE_FS); | |
460 | sbp[0]->s_dev_size = cpu_to_le64(newsize); | |
461 | sbp[0]->s_nsegments = cpu_to_le64(nilfs->ns_nsegments); | |
462 | if (sbp[1]) | |
463 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
464 | ret = nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); | |
465 | } | |
466 | up_write(&nilfs->ns_sem); | |
467 | ||
468 | /* | |
469 | * Reset the range of allocatable segments last. This order | |
470 | * is important in the case of expansion because the secondary | |
471 | * superblock must be protected from log write until migration | |
472 | * completes. | |
473 | */ | |
474 | if (!ret) | |
475 | nilfs_sufile_set_alloc_range(nilfs->ns_sufile, 0, newnsegs - 1); | |
476 | out: | |
477 | return ret; | |
478 | } | |
479 | ||
783f6184 RK |
480 | static void nilfs_put_super(struct super_block *sb) |
481 | { | |
e3154e97 | 482 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 483 | |
f7545144 | 484 | nilfs_detach_log_writer(sb); |
783f6184 RK |
485 | |
486 | if (!(sb->s_flags & MS_RDONLY)) { | |
487 | down_write(&nilfs->ns_sem); | |
f7545144 | 488 | nilfs_cleanup_super(sb); |
783f6184 RK |
489 | up_write(&nilfs->ns_sem); |
490 | } | |
491 | ||
f1e89c86 RK |
492 | iput(nilfs->ns_sufile); |
493 | iput(nilfs->ns_cpfile); | |
494 | iput(nilfs->ns_dat); | |
495 | ||
348fe8da | 496 | destroy_nilfs(nilfs); |
783f6184 | 497 | sb->s_fs_info = NULL; |
783f6184 RK |
498 | } |
499 | ||
783f6184 RK |
500 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
501 | { | |
e3154e97 | 502 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 503 | struct nilfs_super_block **sbp; |
783f6184 RK |
504 | int err = 0; |
505 | ||
506 | /* This function is called when super block should be written back */ | |
507 | if (wait) | |
508 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
509 | |
510 | down_write(&nilfs->ns_sem); | |
d26493b6 | 511 | if (nilfs_sb_dirty(nilfs)) { |
f7545144 | 512 | sbp = nilfs_prepare_super(sb, nilfs_sb_will_flip(nilfs)); |
b2ac86e1 JS |
513 | if (likely(sbp)) { |
514 | nilfs_set_log_cursor(sbp[0], nilfs); | |
f7545144 | 515 | nilfs_commit_super(sb, NILFS_SB_COMMIT); |
b2ac86e1 | 516 | } |
d26493b6 | 517 | } |
6233caa9 JS |
518 | up_write(&nilfs->ns_sem); |
519 | ||
e2c7617a AR |
520 | if (!err) |
521 | err = nilfs_flush_device(nilfs); | |
522 | ||
783f6184 RK |
523 | return err; |
524 | } | |
525 | ||
f7545144 | 526 | int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt, |
4d8d9293 | 527 | struct nilfs_root **rootp) |
783f6184 | 528 | { |
e3154e97 | 529 | struct the_nilfs *nilfs = sb->s_fs_info; |
4d8d9293 | 530 | struct nilfs_root *root; |
783f6184 RK |
531 | struct nilfs_checkpoint *raw_cp; |
532 | struct buffer_head *bh_cp; | |
4d8d9293 | 533 | int err = -ENOMEM; |
783f6184 | 534 | |
4d8d9293 RK |
535 | root = nilfs_find_or_create_root( |
536 | nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); | |
537 | if (!root) | |
538 | return err; | |
783f6184 | 539 | |
e912a5b6 RK |
540 | if (root->ifile) |
541 | goto reuse; /* already attached checkpoint */ | |
783f6184 | 542 | |
1154ecbd | 543 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
544 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
545 | &bh_cp); | |
1154ecbd | 546 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
547 | if (unlikely(err)) { |
548 | if (err == -ENOENT || err == -EINVAL) { | |
549 | printk(KERN_ERR | |
550 | "NILFS: Invalid checkpoint " | |
551 | "(checkpoint number=%llu)\n", | |
552 | (unsigned long long)cno); | |
553 | err = -EINVAL; | |
554 | } | |
555 | goto failed; | |
556 | } | |
f1e89c86 | 557 | |
f7545144 | 558 | err = nilfs_ifile_read(sb, root, nilfs->ns_inode_size, |
f1e89c86 RK |
559 | &raw_cp->cp_ifile_inode, &root->ifile); |
560 | if (err) | |
783f6184 | 561 | goto failed_bh; |
b7c06342 | 562 | |
e5f7f848 VD |
563 | atomic64_set(&root->inodes_count, |
564 | le64_to_cpu(raw_cp->cp_inodes_count)); | |
565 | atomic64_set(&root->blocks_count, | |
566 | le64_to_cpu(raw_cp->cp_blocks_count)); | |
783f6184 RK |
567 | |
568 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
4d8d9293 | 569 | |
e912a5b6 | 570 | reuse: |
4d8d9293 | 571 | *rootp = root; |
783f6184 RK |
572 | return 0; |
573 | ||
574 | failed_bh: | |
575 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
576 | failed: | |
4d8d9293 | 577 | nilfs_put_root(root); |
783f6184 RK |
578 | |
579 | return err; | |
580 | } | |
783f6184 | 581 | |
5beb6e0b RK |
582 | static int nilfs_freeze(struct super_block *sb) |
583 | { | |
e3154e97 | 584 | struct the_nilfs *nilfs = sb->s_fs_info; |
5beb6e0b RK |
585 | int err; |
586 | ||
587 | if (sb->s_flags & MS_RDONLY) | |
588 | return 0; | |
783f6184 | 589 | |
5beb6e0b RK |
590 | /* Mark super block clean */ |
591 | down_write(&nilfs->ns_sem); | |
f7545144 | 592 | err = nilfs_cleanup_super(sb); |
5beb6e0b | 593 | up_write(&nilfs->ns_sem); |
783f6184 RK |
594 | return err; |
595 | } | |
596 | ||
5beb6e0b | 597 | static int nilfs_unfreeze(struct super_block *sb) |
783f6184 | 598 | { |
e3154e97 | 599 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 600 | |
5beb6e0b RK |
601 | if (sb->s_flags & MS_RDONLY) |
602 | return 0; | |
603 | ||
604 | down_write(&nilfs->ns_sem); | |
f7545144 | 605 | nilfs_setup_super(sb, false); |
5beb6e0b RK |
606 | up_write(&nilfs->ns_sem); |
607 | return 0; | |
783f6184 RK |
608 | } |
609 | ||
783f6184 RK |
610 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
611 | { | |
612 | struct super_block *sb = dentry->d_sb; | |
b7c06342 RK |
613 | struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root; |
614 | struct the_nilfs *nilfs = root->nilfs; | |
c306af23 | 615 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
783f6184 RK |
616 | unsigned long long blocks; |
617 | unsigned long overhead; | |
618 | unsigned long nrsvblocks; | |
619 | sector_t nfreeblocks; | |
c7ef972c | 620 | u64 nmaxinodes, nfreeinodes; |
783f6184 RK |
621 | int err; |
622 | ||
623 | /* | |
624 | * Compute all of the segment blocks | |
625 | * | |
626 | * The blocks before first segment and after last segment | |
627 | * are excluded. | |
628 | */ | |
629 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
630 | - nilfs->ns_first_data_block; | |
631 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
632 | ||
633 | /* | |
634 | * Compute the overhead | |
635 | * | |
7a65004b | 636 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
637 | * We must count them as the overhead. |
638 | */ | |
639 | overhead = 0; | |
640 | ||
641 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
642 | if (unlikely(err)) | |
643 | return err; | |
644 | ||
c7ef972c VD |
645 | err = nilfs_ifile_count_free_inodes(root->ifile, |
646 | &nmaxinodes, &nfreeinodes); | |
647 | if (unlikely(err)) { | |
648 | printk(KERN_WARNING | |
649 | "NILFS warning: fail to count free inodes: err %d.\n", | |
650 | err); | |
651 | if (err == -ERANGE) { | |
652 | /* | |
653 | * If nilfs_palloc_count_max_entries() returns | |
654 | * -ERANGE error code then we simply treat | |
655 | * curent inodes count as maximum possible and | |
656 | * zero as free inodes value. | |
657 | */ | |
e5f7f848 | 658 | nmaxinodes = atomic64_read(&root->inodes_count); |
c7ef972c VD |
659 | nfreeinodes = 0; |
660 | err = 0; | |
661 | } else | |
662 | return err; | |
663 | } | |
664 | ||
783f6184 RK |
665 | buf->f_type = NILFS_SUPER_MAGIC; |
666 | buf->f_bsize = sb->s_blocksize; | |
667 | buf->f_blocks = blocks - overhead; | |
668 | buf->f_bfree = nfreeblocks; | |
669 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
670 | (buf->f_bfree - nrsvblocks) : 0; | |
c7ef972c VD |
671 | buf->f_files = nmaxinodes; |
672 | buf->f_ffree = nfreeinodes; | |
783f6184 | 673 | buf->f_namelen = NILFS_NAME_LEN; |
c306af23 RK |
674 | buf->f_fsid.val[0] = (u32)id; |
675 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
676 | ||
783f6184 RK |
677 | return 0; |
678 | } | |
679 | ||
34c80b1d | 680 | static int nilfs_show_options(struct seq_file *seq, struct dentry *dentry) |
b58a285b | 681 | { |
34c80b1d | 682 | struct super_block *sb = dentry->d_sb; |
e3154e97 | 683 | struct the_nilfs *nilfs = sb->s_fs_info; |
34c80b1d | 684 | struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root; |
b58a285b | 685 | |
3b2ce58b | 686 | if (!nilfs_test_opt(nilfs, BARRIER)) |
c6b4d57d | 687 | seq_puts(seq, ",nobarrier"); |
f11459ad RK |
688 | if (root->cno != NILFS_CPTREE_CURRENT_CNO) |
689 | seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno); | |
3b2ce58b | 690 | if (nilfs_test_opt(nilfs, ERRORS_PANIC)) |
c6b4d57d | 691 | seq_puts(seq, ",errors=panic"); |
3b2ce58b | 692 | if (nilfs_test_opt(nilfs, ERRORS_CONT)) |
c6b4d57d | 693 | seq_puts(seq, ",errors=continue"); |
3b2ce58b | 694 | if (nilfs_test_opt(nilfs, STRICT_ORDER)) |
c6b4d57d | 695 | seq_puts(seq, ",order=strict"); |
3b2ce58b | 696 | if (nilfs_test_opt(nilfs, NORECOVERY)) |
c6b4d57d | 697 | seq_puts(seq, ",norecovery"); |
3b2ce58b | 698 | if (nilfs_test_opt(nilfs, DISCARD)) |
c6b4d57d | 699 | seq_puts(seq, ",discard"); |
b58a285b JS |
700 | |
701 | return 0; | |
702 | } | |
703 | ||
b87221de | 704 | static const struct super_operations nilfs_sops = { |
783f6184 RK |
705 | .alloc_inode = nilfs_alloc_inode, |
706 | .destroy_inode = nilfs_destroy_inode, | |
707 | .dirty_inode = nilfs_dirty_inode, | |
6fd1e5c9 | 708 | .evict_inode = nilfs_evict_inode, |
783f6184 | 709 | .put_super = nilfs_put_super, |
783f6184 | 710 | .sync_fs = nilfs_sync_fs, |
5beb6e0b RK |
711 | .freeze_fs = nilfs_freeze, |
712 | .unfreeze_fs = nilfs_unfreeze, | |
783f6184 RK |
713 | .statfs = nilfs_statfs, |
714 | .remount_fs = nilfs_remount, | |
b58a285b | 715 | .show_options = nilfs_show_options |
783f6184 RK |
716 | }; |
717 | ||
783f6184 RK |
718 | enum { |
719 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
773bc4f3 | 720 | Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
802d3177 | 721 | Opt_discard, Opt_nodiscard, Opt_err, |
783f6184 RK |
722 | }; |
723 | ||
724 | static match_table_t tokens = { | |
725 | {Opt_err_cont, "errors=continue"}, | |
726 | {Opt_err_panic, "errors=panic"}, | |
727 | {Opt_err_ro, "errors=remount-ro"}, | |
773bc4f3 | 728 | {Opt_barrier, "barrier"}, |
91f1953b | 729 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
730 | {Opt_snapshot, "cp=%u"}, |
731 | {Opt_order, "order=%s"}, | |
0234576d | 732 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 733 | {Opt_discard, "discard"}, |
802d3177 | 734 | {Opt_nodiscard, "nodiscard"}, |
783f6184 RK |
735 | {Opt_err, NULL} |
736 | }; | |
737 | ||
7c017457 | 738 | static int parse_options(char *options, struct super_block *sb, int is_remount) |
783f6184 | 739 | { |
e3154e97 | 740 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 RK |
741 | char *p; |
742 | substring_t args[MAX_OPT_ARGS]; | |
783f6184 RK |
743 | |
744 | if (!options) | |
745 | return 1; | |
746 | ||
747 | while ((p = strsep(&options, ",")) != NULL) { | |
748 | int token; | |
749 | if (!*p) | |
750 | continue; | |
751 | ||
752 | token = match_token(p, tokens, args); | |
753 | switch (token) { | |
773bc4f3 | 754 | case Opt_barrier: |
3b2ce58b | 755 | nilfs_set_opt(nilfs, BARRIER); |
773bc4f3 | 756 | break; |
91f1953b | 757 | case Opt_nobarrier: |
3b2ce58b | 758 | nilfs_clear_opt(nilfs, BARRIER); |
783f6184 RK |
759 | break; |
760 | case Opt_order: | |
761 | if (strcmp(args[0].from, "relaxed") == 0) | |
762 | /* Ordered data semantics */ | |
3b2ce58b | 763 | nilfs_clear_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
764 | else if (strcmp(args[0].from, "strict") == 0) |
765 | /* Strict in-order semantics */ | |
3b2ce58b | 766 | nilfs_set_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
767 | else |
768 | return 0; | |
769 | break; | |
770 | case Opt_err_panic: | |
3b2ce58b | 771 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC); |
783f6184 RK |
772 | break; |
773 | case Opt_err_ro: | |
3b2ce58b | 774 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO); |
783f6184 RK |
775 | break; |
776 | case Opt_err_cont: | |
3b2ce58b | 777 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT); |
783f6184 RK |
778 | break; |
779 | case Opt_snapshot: | |
7c017457 | 780 | if (is_remount) { |
f11459ad RK |
781 | printk(KERN_ERR |
782 | "NILFS: \"%s\" option is invalid " | |
783 | "for remount.\n", p); | |
783f6184 | 784 | return 0; |
7c017457 | 785 | } |
783f6184 | 786 | break; |
0234576d | 787 | case Opt_norecovery: |
3b2ce58b | 788 | nilfs_set_opt(nilfs, NORECOVERY); |
0234576d | 789 | break; |
e902ec99 | 790 | case Opt_discard: |
3b2ce58b | 791 | nilfs_set_opt(nilfs, DISCARD); |
e902ec99 | 792 | break; |
802d3177 | 793 | case Opt_nodiscard: |
3b2ce58b | 794 | nilfs_clear_opt(nilfs, DISCARD); |
802d3177 | 795 | break; |
783f6184 RK |
796 | default: |
797 | printk(KERN_ERR | |
798 | "NILFS: Unrecognized mount option \"%s\"\n", p); | |
799 | return 0; | |
800 | } | |
801 | } | |
802 | return 1; | |
803 | } | |
804 | ||
805 | static inline void | |
3b2ce58b | 806 | nilfs_set_default_options(struct super_block *sb, |
783f6184 RK |
807 | struct nilfs_super_block *sbp) |
808 | { | |
e3154e97 | 809 | struct the_nilfs *nilfs = sb->s_fs_info; |
3b2ce58b RK |
810 | |
811 | nilfs->ns_mount_opt = | |
277a6a34 | 812 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
813 | } |
814 | ||
f7545144 | 815 | static int nilfs_setup_super(struct super_block *sb, int is_mount) |
783f6184 | 816 | { |
e3154e97 | 817 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 JS |
818 | struct nilfs_super_block **sbp; |
819 | int max_mnt_count; | |
820 | int mnt_count; | |
821 | ||
822 | /* nilfs->ns_sem must be locked by the caller. */ | |
f7545144 | 823 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 JS |
824 | if (!sbp) |
825 | return -EIO; | |
826 | ||
5beb6e0b RK |
827 | if (!is_mount) |
828 | goto skip_mount_setup; | |
829 | ||
d26493b6 JS |
830 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); |
831 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); | |
783f6184 | 832 | |
f50a4c81 | 833 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
783f6184 RK |
834 | printk(KERN_WARNING |
835 | "NILFS warning: mounting fs with errors\n"); | |
836 | #if 0 | |
837 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
838 | printk(KERN_WARNING | |
839 | "NILFS warning: maximal mount count reached\n"); | |
840 | #endif | |
841 | } | |
842 | if (!max_mnt_count) | |
d26493b6 | 843 | sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
783f6184 | 844 | |
d26493b6 | 845 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
5beb6e0b RK |
846 | sbp[0]->s_mtime = cpu_to_le64(get_seconds()); |
847 | ||
848 | skip_mount_setup: | |
d26493b6 JS |
849 | sbp[0]->s_state = |
850 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); | |
b2ac86e1 | 851 | /* synchronize sbp[1] with sbp[0] */ |
0ca7a5b9 RK |
852 | if (sbp[1]) |
853 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
f7545144 | 854 | return nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); |
783f6184 RK |
855 | } |
856 | ||
e339ad31 RK |
857 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
858 | u64 pos, int blocksize, | |
859 | struct buffer_head **pbh) | |
783f6184 | 860 | { |
e339ad31 RK |
861 | unsigned long long sb_index = pos; |
862 | unsigned long offset; | |
783f6184 | 863 | |
e339ad31 | 864 | offset = do_div(sb_index, blocksize); |
783f6184 | 865 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 866 | if (!*pbh) |
783f6184 | 867 | return NULL; |
783f6184 RK |
868 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
869 | } | |
870 | ||
783f6184 RK |
871 | int nilfs_store_magic_and_option(struct super_block *sb, |
872 | struct nilfs_super_block *sbp, | |
873 | char *data) | |
874 | { | |
e3154e97 | 875 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 876 | |
783f6184 RK |
877 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
878 | ||
879 | /* FS independent flags */ | |
880 | #ifdef NILFS_ATIME_DISABLE | |
881 | sb->s_flags |= MS_NOATIME; | |
882 | #endif | |
883 | ||
3b2ce58b | 884 | nilfs_set_default_options(sb, sbp); |
783f6184 | 885 | |
574e6c31 RK |
886 | nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid); |
887 | nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid); | |
888 | nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval); | |
889 | nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max); | |
783f6184 | 890 | |
7c017457 | 891 | return !parse_options(data, sb, 0) ? -EINVAL : 0 ; |
783f6184 RK |
892 | } |
893 | ||
c5ca48aa RK |
894 | int nilfs_check_feature_compatibility(struct super_block *sb, |
895 | struct nilfs_super_block *sbp) | |
896 | { | |
897 | __u64 features; | |
898 | ||
899 | features = le64_to_cpu(sbp->s_feature_incompat) & | |
900 | ~NILFS_FEATURE_INCOMPAT_SUPP; | |
901 | if (features) { | |
902 | printk(KERN_ERR "NILFS: couldn't mount because of unsupported " | |
903 | "optional features (%llx)\n", | |
904 | (unsigned long long)features); | |
905 | return -EINVAL; | |
906 | } | |
907 | features = le64_to_cpu(sbp->s_feature_compat_ro) & | |
908 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
909 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
910 | printk(KERN_ERR "NILFS: couldn't mount RDWR because of " | |
911 | "unsupported optional features (%llx)\n", | |
912 | (unsigned long long)features); | |
913 | return -EINVAL; | |
914 | } | |
915 | return 0; | |
916 | } | |
917 | ||
367ea334 RK |
918 | static int nilfs_get_root_dentry(struct super_block *sb, |
919 | struct nilfs_root *root, | |
920 | struct dentry **root_dentry) | |
921 | { | |
922 | struct inode *inode; | |
923 | struct dentry *dentry; | |
924 | int ret = 0; | |
925 | ||
926 | inode = nilfs_iget(sb, root, NILFS_ROOT_INO); | |
927 | if (IS_ERR(inode)) { | |
928 | printk(KERN_ERR "NILFS: get root inode failed\n"); | |
929 | ret = PTR_ERR(inode); | |
930 | goto out; | |
931 | } | |
932 | if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { | |
933 | iput(inode); | |
934 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); | |
935 | ret = -EINVAL; | |
936 | goto out; | |
937 | } | |
938 | ||
f11459ad RK |
939 | if (root->cno == NILFS_CPTREE_CURRENT_CNO) { |
940 | dentry = d_find_alias(inode); | |
941 | if (!dentry) { | |
48fde701 | 942 | dentry = d_make_root(inode); |
f11459ad | 943 | if (!dentry) { |
f11459ad RK |
944 | ret = -ENOMEM; |
945 | goto failed_dentry; | |
946 | } | |
947 | } else { | |
948 | iput(inode); | |
949 | } | |
950 | } else { | |
1a0a397e | 951 | dentry = d_obtain_root(inode); |
f11459ad RK |
952 | if (IS_ERR(dentry)) { |
953 | ret = PTR_ERR(dentry); | |
954 | goto failed_dentry; | |
955 | } | |
367ea334 RK |
956 | } |
957 | *root_dentry = dentry; | |
958 | out: | |
959 | return ret; | |
f11459ad RK |
960 | |
961 | failed_dentry: | |
962 | printk(KERN_ERR "NILFS: get root dentry failed\n"); | |
963 | goto out; | |
367ea334 RK |
964 | } |
965 | ||
ab4d8f7e RK |
966 | static int nilfs_attach_snapshot(struct super_block *s, __u64 cno, |
967 | struct dentry **root_dentry) | |
968 | { | |
e3154e97 | 969 | struct the_nilfs *nilfs = s->s_fs_info; |
ab4d8f7e RK |
970 | struct nilfs_root *root; |
971 | int ret; | |
972 | ||
572d8b39 RK |
973 | mutex_lock(&nilfs->ns_snapshot_mount_mutex); |
974 | ||
ab4d8f7e RK |
975 | down_read(&nilfs->ns_segctor_sem); |
976 | ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno); | |
977 | up_read(&nilfs->ns_segctor_sem); | |
978 | if (ret < 0) { | |
979 | ret = (ret == -ENOENT) ? -EINVAL : ret; | |
980 | goto out; | |
981 | } else if (!ret) { | |
982 | printk(KERN_ERR "NILFS: The specified checkpoint is " | |
983 | "not a snapshot (checkpoint number=%llu).\n", | |
984 | (unsigned long long)cno); | |
985 | ret = -EINVAL; | |
986 | goto out; | |
987 | } | |
988 | ||
f7545144 | 989 | ret = nilfs_attach_checkpoint(s, cno, false, &root); |
ab4d8f7e RK |
990 | if (ret) { |
991 | printk(KERN_ERR "NILFS: error loading snapshot " | |
992 | "(checkpoint number=%llu).\n", | |
993 | (unsigned long long)cno); | |
994 | goto out; | |
995 | } | |
996 | ret = nilfs_get_root_dentry(s, root, root_dentry); | |
997 | nilfs_put_root(root); | |
998 | out: | |
572d8b39 | 999 | mutex_unlock(&nilfs->ns_snapshot_mount_mutex); |
ab4d8f7e RK |
1000 | return ret; |
1001 | } | |
1002 | ||
f11459ad | 1003 | /** |
e95c311e | 1004 | * nilfs_tree_is_busy() - try to shrink dentries of a checkpoint |
f11459ad RK |
1005 | * @root_dentry: root dentry of the tree to be shrunk |
1006 | * | |
1007 | * This function returns true if the tree was in-use. | |
1008 | */ | |
e95c311e | 1009 | static bool nilfs_tree_is_busy(struct dentry *root_dentry) |
f11459ad | 1010 | { |
f11459ad | 1011 | shrink_dcache_parent(root_dentry); |
e95c311e | 1012 | return d_count(root_dentry) > 1; |
f11459ad RK |
1013 | } |
1014 | ||
032dbb3b RK |
1015 | int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno) |
1016 | { | |
e3154e97 | 1017 | struct the_nilfs *nilfs = sb->s_fs_info; |
032dbb3b RK |
1018 | struct nilfs_root *root; |
1019 | struct inode *inode; | |
1020 | struct dentry *dentry; | |
1021 | int ret; | |
1022 | ||
1023 | if (cno < 0 || cno > nilfs->ns_cno) | |
1024 | return false; | |
1025 | ||
1026 | if (cno >= nilfs_last_cno(nilfs)) | |
1027 | return true; /* protect recent checkpoints */ | |
1028 | ||
1029 | ret = false; | |
e3154e97 | 1030 | root = nilfs_lookup_root(nilfs, cno); |
032dbb3b RK |
1031 | if (root) { |
1032 | inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO); | |
1033 | if (inode) { | |
1034 | dentry = d_find_alias(inode); | |
1035 | if (dentry) { | |
e95c311e | 1036 | ret = nilfs_tree_is_busy(dentry); |
032dbb3b RK |
1037 | dput(dentry); |
1038 | } | |
1039 | iput(inode); | |
1040 | } | |
1041 | nilfs_put_root(root); | |
1042 | } | |
1043 | return ret; | |
1044 | } | |
1045 | ||
783f6184 RK |
1046 | /** |
1047 | * nilfs_fill_super() - initialize a super block instance | |
1048 | * @sb: super_block | |
1049 | * @data: mount options | |
1050 | * @silent: silent mode flag | |
783f6184 | 1051 | * |
aa7dfb89 | 1052 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
1053 | * So, the recovery process is protected from other simultaneous mounts. |
1054 | */ | |
1055 | static int | |
348fe8da | 1056 | nilfs_fill_super(struct super_block *sb, void *data, int silent) |
783f6184 | 1057 | { |
348fe8da | 1058 | struct the_nilfs *nilfs; |
4d8d9293 | 1059 | struct nilfs_root *fsroot; |
026a7d63 | 1060 | struct backing_dev_info *bdi; |
783f6184 RK |
1061 | __u64 cno; |
1062 | int err; | |
1063 | ||
e3154e97 RK |
1064 | nilfs = alloc_nilfs(sb->s_bdev); |
1065 | if (!nilfs) | |
783f6184 RK |
1066 | return -ENOMEM; |
1067 | ||
e3154e97 | 1068 | sb->s_fs_info = nilfs; |
783f6184 | 1069 | |
f7545144 | 1070 | err = init_nilfs(nilfs, sb, (char *)data); |
783f6184 | 1071 | if (err) |
348fe8da | 1072 | goto failed_nilfs; |
783f6184 | 1073 | |
783f6184 RK |
1074 | sb->s_op = &nilfs_sops; |
1075 | sb->s_export_op = &nilfs_export_ops; | |
1076 | sb->s_root = NULL; | |
61239230 | 1077 | sb->s_time_gran = 1; |
8de52778 | 1078 | sb->s_max_links = NILFS_LINK_MAX; |
026a7d63 RK |
1079 | |
1080 | bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info; | |
1081 | sb->s_bdi = bdi ? : &default_backing_dev_info; | |
783f6184 | 1082 | |
f7545144 | 1083 | err = load_nilfs(nilfs, sb); |
f50a4c81 | 1084 | if (err) |
348fe8da | 1085 | goto failed_nilfs; |
f50a4c81 | 1086 | |
783f6184 | 1087 | cno = nilfs_last_cno(nilfs); |
f7545144 | 1088 | err = nilfs_attach_checkpoint(sb, cno, true, &fsroot); |
783f6184 | 1089 | if (err) { |
f11459ad RK |
1090 | printk(KERN_ERR "NILFS: error loading last checkpoint " |
1091 | "(checkpoint number=%llu).\n", (unsigned long long)cno); | |
f1e89c86 | 1092 | goto failed_unload; |
783f6184 RK |
1093 | } |
1094 | ||
1095 | if (!(sb->s_flags & MS_RDONLY)) { | |
f7545144 | 1096 | err = nilfs_attach_log_writer(sb, fsroot); |
783f6184 RK |
1097 | if (err) |
1098 | goto failed_checkpoint; | |
1099 | } | |
1100 | ||
367ea334 RK |
1101 | err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root); |
1102 | if (err) | |
783f6184 | 1103 | goto failed_segctor; |
783f6184 | 1104 | |
4d8d9293 | 1105 | nilfs_put_root(fsroot); |
783f6184 RK |
1106 | |
1107 | if (!(sb->s_flags & MS_RDONLY)) { | |
1108 | down_write(&nilfs->ns_sem); | |
f7545144 | 1109 | nilfs_setup_super(sb, true); |
783f6184 RK |
1110 | up_write(&nilfs->ns_sem); |
1111 | } | |
1112 | ||
783f6184 RK |
1113 | return 0; |
1114 | ||
783f6184 | 1115 | failed_segctor: |
f7545144 | 1116 | nilfs_detach_log_writer(sb); |
783f6184 RK |
1117 | |
1118 | failed_checkpoint: | |
4d8d9293 | 1119 | nilfs_put_root(fsroot); |
783f6184 | 1120 | |
f1e89c86 RK |
1121 | failed_unload: |
1122 | iput(nilfs->ns_sufile); | |
1123 | iput(nilfs->ns_cpfile); | |
1124 | iput(nilfs->ns_dat); | |
1125 | ||
348fe8da RK |
1126 | failed_nilfs: |
1127 | destroy_nilfs(nilfs); | |
783f6184 RK |
1128 | return err; |
1129 | } | |
1130 | ||
1131 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
1132 | { | |
e3154e97 | 1133 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 1134 | unsigned long old_sb_flags; |
06df0f99 | 1135 | unsigned long old_mount_opt; |
f11459ad | 1136 | int err; |
783f6184 | 1137 | |
02b9984d | 1138 | sync_filesystem(sb); |
783f6184 | 1139 | old_sb_flags = sb->s_flags; |
3b2ce58b | 1140 | old_mount_opt = nilfs->ns_mount_opt; |
783f6184 | 1141 | |
7c017457 | 1142 | if (!parse_options(data, sb, 1)) { |
783f6184 RK |
1143 | err = -EINVAL; |
1144 | goto restore_opts; | |
1145 | } | |
1146 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); | |
1147 | ||
d240e067 | 1148 | err = -EINVAL; |
783f6184 | 1149 | |
0234576d RK |
1150 | if (!nilfs_valid_fs(nilfs)) { |
1151 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1152 | "remount because the filesystem is in an " | |
1153 | "incomplete recovery state.\n", sb->s_id); | |
0234576d RK |
1154 | goto restore_opts; |
1155 | } | |
1156 | ||
783f6184 RK |
1157 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
1158 | goto out; | |
1159 | if (*flags & MS_RDONLY) { | |
f7545144 RK |
1160 | /* Shutting down log writer */ |
1161 | nilfs_detach_log_writer(sb); | |
783f6184 RK |
1162 | sb->s_flags |= MS_RDONLY; |
1163 | ||
783f6184 RK |
1164 | /* |
1165 | * Remounting a valid RW partition RDONLY, so set | |
1166 | * the RDONLY flag and then mark the partition as valid again. | |
1167 | */ | |
1168 | down_write(&nilfs->ns_sem); | |
f7545144 | 1169 | nilfs_cleanup_super(sb); |
783f6184 RK |
1170 | up_write(&nilfs->ns_sem); |
1171 | } else { | |
c5ca48aa | 1172 | __u64 features; |
e912a5b6 | 1173 | struct nilfs_root *root; |
c5ca48aa | 1174 | |
783f6184 RK |
1175 | /* |
1176 | * Mounting a RDONLY partition read-write, so reread and | |
1177 | * store the current valid flag. (It may have been changed | |
1178 | * by fsck since we originally mounted the partition.) | |
1179 | */ | |
c5ca48aa RK |
1180 | down_read(&nilfs->ns_sem); |
1181 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & | |
1182 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
1183 | up_read(&nilfs->ns_sem); | |
1184 | if (features) { | |
1185 | printk(KERN_WARNING "NILFS (device %s): couldn't " | |
1186 | "remount RDWR because of unsupported optional " | |
1187 | "features (%llx)\n", | |
1188 | sb->s_id, (unsigned long long)features); | |
1189 | err = -EROFS; | |
1190 | goto restore_opts; | |
1191 | } | |
1192 | ||
783f6184 | 1193 | sb->s_flags &= ~MS_RDONLY; |
783f6184 | 1194 | |
e912a5b6 | 1195 | root = NILFS_I(sb->s_root->d_inode)->i_root; |
f7545144 | 1196 | err = nilfs_attach_log_writer(sb, root); |
783f6184 | 1197 | if (err) |
e59399d0 | 1198 | goto restore_opts; |
783f6184 RK |
1199 | |
1200 | down_write(&nilfs->ns_sem); | |
f7545144 | 1201 | nilfs_setup_super(sb, true); |
783f6184 | 1202 | up_write(&nilfs->ns_sem); |
783f6184 RK |
1203 | } |
1204 | out: | |
1205 | return 0; | |
1206 | ||
783f6184 RK |
1207 | restore_opts: |
1208 | sb->s_flags = old_sb_flags; | |
3b2ce58b | 1209 | nilfs->ns_mount_opt = old_mount_opt; |
783f6184 RK |
1210 | return err; |
1211 | } | |
1212 | ||
1213 | struct nilfs_super_data { | |
1214 | struct block_device *bdev; | |
1215 | __u64 cno; | |
1216 | int flags; | |
1217 | }; | |
1218 | ||
1219 | /** | |
1220 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
1221 | * @data: mount options | |
1222 | * @sd: nilfs_super_data | |
1223 | */ | |
1224 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
1225 | { | |
1226 | char *p, *options = data; | |
1227 | substring_t args[MAX_OPT_ARGS]; | |
c05dbfc2 | 1228 | int token; |
783f6184 RK |
1229 | int ret = 0; |
1230 | ||
1231 | do { | |
1232 | p = strsep(&options, ","); | |
1233 | if (p != NULL && *p) { | |
1234 | token = match_token(p, tokens, args); | |
1235 | if (token == Opt_snapshot) { | |
c05dbfc2 | 1236 | if (!(sd->flags & MS_RDONLY)) { |
783f6184 | 1237 | ret++; |
c05dbfc2 RK |
1238 | } else { |
1239 | sd->cno = simple_strtoull(args[0].from, | |
1240 | NULL, 0); | |
1241 | /* | |
1242 | * No need to see the end pointer; | |
1243 | * match_token() has done syntax | |
1244 | * checking. | |
1245 | */ | |
1246 | if (sd->cno == 0) | |
1247 | ret++; | |
783f6184 RK |
1248 | } |
1249 | } | |
1250 | if (ret) | |
1251 | printk(KERN_ERR | |
1252 | "NILFS: invalid mount option: %s\n", p); | |
1253 | } | |
1254 | if (!options) | |
1255 | break; | |
1256 | BUG_ON(options == data); | |
1257 | *(options - 1) = ','; | |
1258 | } while (!ret); | |
1259 | return ret; | |
1260 | } | |
1261 | ||
1262 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1263 | { | |
f11459ad | 1264 | s->s_bdev = data; |
783f6184 RK |
1265 | s->s_dev = s->s_bdev->bd_dev; |
1266 | return 0; | |
1267 | } | |
1268 | ||
1269 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 | 1270 | { |
f11459ad | 1271 | return (void *)s->s_bdev == data; |
783f6184 RK |
1272 | } |
1273 | ||
e4c59d61 AV |
1274 | static struct dentry * |
1275 | nilfs_mount(struct file_system_type *fs_type, int flags, | |
1276 | const char *dev_name, void *data) | |
783f6184 RK |
1277 | { |
1278 | struct nilfs_super_data sd; | |
33c8e57c | 1279 | struct super_block *s; |
d4d77629 | 1280 | fmode_t mode = FMODE_READ | FMODE_EXCL; |
f11459ad RK |
1281 | struct dentry *root_dentry; |
1282 | int err, s_new = false; | |
783f6184 | 1283 | |
13e90559 RK |
1284 | if (!(flags & MS_RDONLY)) |
1285 | mode |= FMODE_WRITE; | |
1286 | ||
d4d77629 | 1287 | sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type); |
d6d4c19c | 1288 | if (IS_ERR(sd.bdev)) |
e4c59d61 | 1289 | return ERR_CAST(sd.bdev); |
783f6184 | 1290 | |
783f6184 RK |
1291 | sd.cno = 0; |
1292 | sd.flags = flags; | |
1293 | if (nilfs_identify((char *)data, &sd)) { | |
1294 | err = -EINVAL; | |
1295 | goto failed; | |
1296 | } | |
1297 | ||
6dd47406 | 1298 | /* |
5beb6e0b RK |
1299 | * once the super is inserted into the list by sget, s_umount |
1300 | * will protect the lockfs code from trying to start a snapshot | |
1301 | * while we are mounting | |
6dd47406 | 1302 | */ |
5beb6e0b RK |
1303 | mutex_lock(&sd.bdev->bd_fsfreeze_mutex); |
1304 | if (sd.bdev->bd_fsfreeze_count > 0) { | |
1305 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); | |
1306 | err = -EBUSY; | |
1307 | goto failed; | |
1308 | } | |
9249e17f DH |
1309 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, flags, |
1310 | sd.bdev); | |
5beb6e0b | 1311 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); |
33c8e57c RK |
1312 | if (IS_ERR(s)) { |
1313 | err = PTR_ERR(s); | |
348fe8da | 1314 | goto failed; |
783f6184 RK |
1315 | } |
1316 | ||
1317 | if (!s->s_root) { | |
1318 | char b[BDEVNAME_SIZE]; | |
1319 | ||
f11459ad RK |
1320 | s_new = true; |
1321 | ||
33c8e57c | 1322 | /* New superblock instance created */ |
4571b82c | 1323 | s->s_mode = mode; |
783f6184 RK |
1324 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); |
1325 | sb_set_blocksize(s, block_size(sd.bdev)); | |
1326 | ||
348fe8da | 1327 | err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
783f6184 | 1328 | if (err) |
348fe8da | 1329 | goto failed_super; |
783f6184 RK |
1330 | |
1331 | s->s_flags |= MS_ACTIVE; | |
f11459ad | 1332 | } else if (!sd.cno) { |
e95c311e AV |
1333 | if (nilfs_tree_is_busy(s->s_root)) { |
1334 | if ((flags ^ s->s_flags) & MS_RDONLY) { | |
f11459ad RK |
1335 | printk(KERN_ERR "NILFS: the device already " |
1336 | "has a %s mount.\n", | |
1337 | (s->s_flags & MS_RDONLY) ? | |
1338 | "read-only" : "read/write"); | |
1339 | err = -EBUSY; | |
1340 | goto failed_super; | |
1341 | } | |
e95c311e | 1342 | } else { |
f11459ad RK |
1343 | /* |
1344 | * Try remount to setup mount states if the current | |
1345 | * tree is not mounted and only snapshots use this sb. | |
1346 | */ | |
1347 | err = nilfs_remount(s, &flags, data); | |
1348 | if (err) | |
1349 | goto failed_super; | |
1350 | } | |
783f6184 RK |
1351 | } |
1352 | ||
f11459ad RK |
1353 | if (sd.cno) { |
1354 | err = nilfs_attach_snapshot(s, sd.cno, &root_dentry); | |
348fe8da | 1355 | if (err) |
f11459ad | 1356 | goto failed_super; |
f11459ad RK |
1357 | } else { |
1358 | root_dentry = dget(s->s_root); | |
783f6184 RK |
1359 | } |
1360 | ||
f11459ad | 1361 | if (!s_new) |
d4d77629 | 1362 | blkdev_put(sd.bdev, mode); |
783f6184 | 1363 | |
e4c59d61 | 1364 | return root_dentry; |
783f6184 | 1365 | |
f11459ad | 1366 | failed_super: |
a95161aa | 1367 | deactivate_locked_super(s); |
783f6184 | 1368 | |
348fe8da RK |
1369 | failed: |
1370 | if (!s_new) | |
d4d77629 | 1371 | blkdev_put(sd.bdev, mode); |
e4c59d61 | 1372 | return ERR_PTR(err); |
783f6184 RK |
1373 | } |
1374 | ||
783f6184 RK |
1375 | struct file_system_type nilfs_fs_type = { |
1376 | .owner = THIS_MODULE, | |
1377 | .name = "nilfs2", | |
e4c59d61 | 1378 | .mount = nilfs_mount, |
783f6184 RK |
1379 | .kill_sb = kill_block_super, |
1380 | .fs_flags = FS_REQUIRES_DEV, | |
1381 | }; | |
7f78e035 | 1382 | MODULE_ALIAS_FS("nilfs2"); |
783f6184 | 1383 | |
41c88bd7 | 1384 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1385 | { |
41c88bd7 | 1386 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1387 | |
41c88bd7 LH |
1388 | INIT_LIST_HEAD(&ii->i_dirty); |
1389 | #ifdef CONFIG_NILFS_XATTR | |
1390 | init_rwsem(&ii->xattr_sem); | |
1391 | #endif | |
2aa15890 | 1392 | address_space_init_once(&ii->i_btnode_cache); |
05d0e94b | 1393 | ii->i_bmap = &ii->i_bmap_data; |
41c88bd7 LH |
1394 | inode_init_once(&ii->vfs_inode); |
1395 | } | |
783f6184 | 1396 | |
41c88bd7 LH |
1397 | static void nilfs_segbuf_init_once(void *obj) |
1398 | { | |
1399 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1400 | } | |
783f6184 | 1401 | |
41c88bd7 LH |
1402 | static void nilfs_destroy_cachep(void) |
1403 | { | |
8c0a8537 KS |
1404 | /* |
1405 | * Make sure all delayed rcu free inodes are flushed before we | |
1406 | * destroy cache. | |
1407 | */ | |
1408 | rcu_barrier(); | |
1409 | ||
84cb0999 | 1410 | if (nilfs_inode_cachep) |
41c88bd7 | 1411 | kmem_cache_destroy(nilfs_inode_cachep); |
84cb0999 | 1412 | if (nilfs_transaction_cachep) |
41c88bd7 | 1413 | kmem_cache_destroy(nilfs_transaction_cachep); |
84cb0999 | 1414 | if (nilfs_segbuf_cachep) |
41c88bd7 | 1415 | kmem_cache_destroy(nilfs_segbuf_cachep); |
84cb0999 | 1416 | if (nilfs_btree_path_cache) |
41c88bd7 LH |
1417 | kmem_cache_destroy(nilfs_btree_path_cache); |
1418 | } | |
783f6184 | 1419 | |
41c88bd7 LH |
1420 | static int __init nilfs_init_cachep(void) |
1421 | { | |
1422 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1423 | sizeof(struct nilfs_inode_info), 0, | |
1424 | SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once); | |
1425 | if (!nilfs_inode_cachep) | |
1426 | goto fail; | |
1427 | ||
1428 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1429 | sizeof(struct nilfs_transaction_info), 0, | |
1430 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1431 | if (!nilfs_transaction_cachep) | |
1432 | goto fail; | |
1433 | ||
1434 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1435 | sizeof(struct nilfs_segment_buffer), 0, | |
1436 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1437 | if (!nilfs_segbuf_cachep) | |
1438 | goto fail; | |
1439 | ||
1440 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1441 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1442 | 0, 0, NULL); | |
1443 | if (!nilfs_btree_path_cache) | |
1444 | goto fail; | |
783f6184 RK |
1445 | |
1446 | return 0; | |
1447 | ||
41c88bd7 LH |
1448 | fail: |
1449 | nilfs_destroy_cachep(); | |
1450 | return -ENOMEM; | |
1451 | } | |
1452 | ||
1453 | static int __init init_nilfs_fs(void) | |
1454 | { | |
1455 | int err; | |
783f6184 | 1456 | |
41c88bd7 LH |
1457 | err = nilfs_init_cachep(); |
1458 | if (err) | |
1459 | goto fail; | |
783f6184 | 1460 | |
dd70edbd | 1461 | err = nilfs_sysfs_init(); |
41c88bd7 LH |
1462 | if (err) |
1463 | goto free_cachep; | |
783f6184 | 1464 | |
dd70edbd VD |
1465 | err = register_filesystem(&nilfs_fs_type); |
1466 | if (err) | |
1467 | goto deinit_sysfs_entry; | |
1468 | ||
9f130263 | 1469 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1470 | return 0; |
783f6184 | 1471 | |
dd70edbd VD |
1472 | deinit_sysfs_entry: |
1473 | nilfs_sysfs_exit(); | |
41c88bd7 LH |
1474 | free_cachep: |
1475 | nilfs_destroy_cachep(); | |
1476 | fail: | |
783f6184 RK |
1477 | return err; |
1478 | } | |
1479 | ||
1480 | static void __exit exit_nilfs_fs(void) | |
1481 | { | |
41c88bd7 | 1482 | nilfs_destroy_cachep(); |
dd70edbd | 1483 | nilfs_sysfs_exit(); |
783f6184 RK |
1484 | unregister_filesystem(&nilfs_fs_type); |
1485 | } | |
1486 | ||
1487 | module_init(init_nilfs_fs) | |
1488 | module_exit(exit_nilfs_fs) |