Commit | Line | Data |
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ae98043f | 1 | // SPDX-License-Identifier: GPL-2.0+ |
783f6184 RK |
2 | /* |
3 | * super.c - NILFS module and super block management. | |
4 | * | |
5 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. | |
6 | * | |
4b420ab4 | 7 | * Written by Ryusuke Konishi. |
783f6184 RK |
8 | */ |
9 | /* | |
10 | * linux/fs/ext2/super.c | |
11 | * | |
12 | * Copyright (C) 1992, 1993, 1994, 1995 | |
13 | * Remy Card (card@masi.ibp.fr) | |
14 | * Laboratoire MASI - Institut Blaise Pascal | |
15 | * Universite Pierre et Marie Curie (Paris VI) | |
16 | * | |
17 | * from | |
18 | * | |
19 | * linux/fs/minix/inode.c | |
20 | * | |
21 | * Copyright (C) 1991, 1992 Linus Torvalds | |
22 | * | |
23 | * Big-endian to little-endian byte-swapping/bitmaps by | |
24 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
25 | */ | |
26 | ||
27 | #include <linux/module.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/blkdev.h> | |
32 | #include <linux/parser.h> | |
783f6184 | 33 | #include <linux/crc32.h> |
783f6184 RK |
34 | #include <linux/vfs.h> |
35 | #include <linux/writeback.h> | |
b58a285b JS |
36 | #include <linux/seq_file.h> |
37 | #include <linux/mount.h> | |
783f6184 | 38 | #include "nilfs.h" |
8e656fd5 | 39 | #include "export.h" |
783f6184 RK |
40 | #include "mdt.h" |
41 | #include "alloc.h" | |
05d0e94b RK |
42 | #include "btree.h" |
43 | #include "btnode.h" | |
783f6184 RK |
44 | #include "page.h" |
45 | #include "cpfile.h" | |
4e33f9ea | 46 | #include "sufile.h" /* nilfs_sufile_resize(), nilfs_sufile_set_alloc_range() */ |
783f6184 RK |
47 | #include "ifile.h" |
48 | #include "dat.h" | |
49 | #include "segment.h" | |
50 | #include "segbuf.h" | |
51 | ||
52 | MODULE_AUTHOR("NTT Corp."); | |
53 | MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem " | |
54 | "(NILFS)"); | |
783f6184 RK |
55 | MODULE_LICENSE("GPL"); |
56 | ||
abc0b50b | 57 | static struct kmem_cache *nilfs_inode_cachep; |
41c88bd7 LH |
58 | struct kmem_cache *nilfs_transaction_cachep; |
59 | struct kmem_cache *nilfs_segbuf_cachep; | |
60 | struct kmem_cache *nilfs_btree_path_cache; | |
61 | ||
f7545144 | 62 | static int nilfs_setup_super(struct super_block *sb, int is_mount); |
783f6184 | 63 | static int nilfs_remount(struct super_block *sb, int *flags, char *data); |
783f6184 | 64 | |
a66dfb0a RK |
65 | void __nilfs_msg(struct super_block *sb, const char *level, const char *fmt, |
66 | ...) | |
67 | { | |
68 | struct va_format vaf; | |
69 | va_list args; | |
70 | ||
71 | va_start(args, fmt); | |
72 | vaf.fmt = fmt; | |
73 | vaf.va = &args; | |
74 | if (sb) | |
75 | printk("%sNILFS (%s): %pV\n", level, sb->s_id, &vaf); | |
76 | else | |
77 | printk("%sNILFS: %pV\n", level, &vaf); | |
78 | va_end(args); | |
79 | } | |
80 | ||
f7545144 | 81 | static void nilfs_set_error(struct super_block *sb) |
c8a11c8a | 82 | { |
e3154e97 | 83 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 84 | struct nilfs_super_block **sbp; |
c8a11c8a RK |
85 | |
86 | down_write(&nilfs->ns_sem); | |
87 | if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { | |
88 | nilfs->ns_mount_state |= NILFS_ERROR_FS; | |
f7545144 | 89 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 JS |
90 | if (likely(sbp)) { |
91 | sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
b2ac86e1 JS |
92 | if (sbp[1]) |
93 | sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
f7545144 | 94 | nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); |
d26493b6 | 95 | } |
c8a11c8a RK |
96 | } |
97 | up_write(&nilfs->ns_sem); | |
98 | } | |
99 | ||
783f6184 | 100 | /** |
cae3d4ca | 101 | * __nilfs_error() - report failure condition on a filesystem |
783f6184 | 102 | * |
cae3d4ca RK |
103 | * __nilfs_error() sets an ERROR_FS flag on the superblock as well as |
104 | * reporting an error message. This function should be called when | |
105 | * NILFS detects incoherences or defects of meta data on disk. | |
783f6184 | 106 | * |
cae3d4ca RK |
107 | * This implements the body of nilfs_error() macro. Normally, |
108 | * nilfs_error() should be used. As for sustainable errors such as a | |
d6517deb | 109 | * single-shot I/O error, nilfs_msg() should be used instead. |
cae3d4ca RK |
110 | * |
111 | * Callers should not add a trailing newline since this will do it. | |
783f6184 | 112 | */ |
cae3d4ca RK |
113 | void __nilfs_error(struct super_block *sb, const char *function, |
114 | const char *fmt, ...) | |
783f6184 | 115 | { |
e3154e97 | 116 | struct the_nilfs *nilfs = sb->s_fs_info; |
b004a5eb | 117 | struct va_format vaf; |
783f6184 RK |
118 | va_list args; |
119 | ||
120 | va_start(args, fmt); | |
b004a5eb JP |
121 | |
122 | vaf.fmt = fmt; | |
123 | vaf.va = &args; | |
124 | ||
125 | printk(KERN_CRIT "NILFS error (device %s): %s: %pV\n", | |
126 | sb->s_id, function, &vaf); | |
127 | ||
783f6184 RK |
128 | va_end(args); |
129 | ||
bc98a42c | 130 | if (!sb_rdonly(sb)) { |
f7545144 | 131 | nilfs_set_error(sb); |
783f6184 | 132 | |
3b2ce58b | 133 | if (nilfs_test_opt(nilfs, ERRORS_RO)) { |
783f6184 | 134 | printk(KERN_CRIT "Remounting filesystem read-only\n"); |
1751e8a6 | 135 | sb->s_flags |= SB_RDONLY; |
783f6184 RK |
136 | } |
137 | } | |
138 | ||
3b2ce58b | 139 | if (nilfs_test_opt(nilfs, ERRORS_PANIC)) |
783f6184 RK |
140 | panic("NILFS (device %s): panic forced after error\n", |
141 | sb->s_id); | |
142 | } | |
143 | ||
2879ed66 | 144 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
783f6184 RK |
145 | { |
146 | struct nilfs_inode_info *ii; | |
147 | ||
148 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); | |
149 | if (!ii) | |
150 | return NULL; | |
151 | ii->i_bh = NULL; | |
152 | ii->i_state = 0; | |
0e14a359 | 153 | ii->i_cno = 0; |
b83ae6d4 | 154 | nilfs_mapping_init(&ii->i_btnode_cache, &ii->vfs_inode); |
783f6184 RK |
155 | return &ii->vfs_inode; |
156 | } | |
157 | ||
977c3d18 | 158 | static void nilfs_free_inode(struct inode *inode) |
783f6184 | 159 | { |
2d19961d RK |
160 | if (nilfs_is_metadata_file_inode(inode)) |
161 | nilfs_mdt_destroy(inode); | |
162 | ||
783f6184 RK |
163 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
164 | } | |
165 | ||
f7545144 | 166 | static int nilfs_sync_super(struct super_block *sb, int flag) |
783f6184 | 167 | { |
e3154e97 | 168 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 169 | int err; |
783f6184 | 170 | |
783f6184 | 171 | retry: |
e339ad31 | 172 | set_buffer_dirty(nilfs->ns_sbh[0]); |
3b2ce58b | 173 | if (nilfs_test_opt(nilfs, BARRIER)) { |
87e99511 | 174 | err = __sync_dirty_buffer(nilfs->ns_sbh[0], |
70fd7614 | 175 | REQ_SYNC | REQ_PREFLUSH | REQ_FUA); |
87e99511 CH |
176 | } else { |
177 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); | |
783f6184 | 178 | } |
87e99511 | 179 | |
e339ad31 | 180 | if (unlikely(err)) { |
feee880f RK |
181 | nilfs_msg(sb, KERN_ERR, "unable to write superblock: err=%d", |
182 | err); | |
e339ad31 | 183 | if (err == -EIO && nilfs->ns_sbh[1]) { |
b2ac86e1 JS |
184 | /* |
185 | * sbp[0] points to newer log than sbp[1], | |
186 | * so copy sbp[0] to sbp[1] to take over sbp[0]. | |
187 | */ | |
188 | memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0], | |
189 | nilfs->ns_sbsize); | |
e339ad31 RK |
190 | nilfs_fall_back_super_block(nilfs); |
191 | goto retry; | |
192 | } | |
193 | } else { | |
194 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; | |
195 | ||
b2ac86e1 JS |
196 | nilfs->ns_sbwcount++; |
197 | ||
e339ad31 RK |
198 | /* |
199 | * The latest segment becomes trailable from the position | |
200 | * written in superblock. | |
201 | */ | |
783f6184 | 202 | clear_nilfs_discontinued(nilfs); |
e339ad31 RK |
203 | |
204 | /* update GC protection for recent segments */ | |
205 | if (nilfs->ns_sbh[1]) { | |
b2ac86e1 | 206 | if (flag == NILFS_SB_COMMIT_ALL) { |
e339ad31 | 207 | set_buffer_dirty(nilfs->ns_sbh[1]); |
b2ac86e1 JS |
208 | if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0) |
209 | goto out; | |
e339ad31 | 210 | } |
b2ac86e1 JS |
211 | if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) < |
212 | le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno)) | |
213 | sbp = nilfs->ns_sbp[1]; | |
e339ad31 | 214 | } |
783f6184 | 215 | |
b2ac86e1 JS |
216 | spin_lock(&nilfs->ns_last_segment_lock); |
217 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); | |
218 | spin_unlock(&nilfs->ns_last_segment_lock); | |
219 | } | |
220 | out: | |
783f6184 RK |
221 | return err; |
222 | } | |
223 | ||
60f46b7e RK |
224 | void nilfs_set_log_cursor(struct nilfs_super_block *sbp, |
225 | struct the_nilfs *nilfs) | |
226 | { | |
227 | sector_t nfreeblocks; | |
228 | ||
229 | /* nilfs->ns_sem must be locked by the caller. */ | |
230 | nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
231 | sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
232 | ||
233 | spin_lock(&nilfs->ns_last_segment_lock); | |
234 | sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
235 | sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
236 | sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
237 | spin_unlock(&nilfs->ns_last_segment_lock); | |
238 | } | |
239 | ||
f7545144 | 240 | struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb, |
b2ac86e1 | 241 | int flip) |
783f6184 | 242 | { |
e3154e97 | 243 | struct the_nilfs *nilfs = sb->s_fs_info; |
e339ad31 | 244 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 245 | |
d26493b6 | 246 | /* nilfs->ns_sem must be locked by the caller. */ |
34cb9b5c | 247 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
d26493b6 JS |
248 | if (sbp[1] && |
249 | sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
b2ac86e1 | 250 | memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); |
d26493b6 | 251 | } else { |
feee880f | 252 | nilfs_msg(sb, KERN_CRIT, "superblock broke"); |
d26493b6 | 253 | return NULL; |
e339ad31 | 254 | } |
b2ac86e1 JS |
255 | } else if (sbp[1] && |
256 | sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
7592ecde | 257 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); |
e339ad31 | 258 | } |
b2ac86e1 JS |
259 | |
260 | if (flip && sbp[1]) | |
261 | nilfs_swap_super_block(nilfs); | |
262 | ||
d26493b6 JS |
263 | return sbp; |
264 | } | |
265 | ||
f7545144 | 266 | int nilfs_commit_super(struct super_block *sb, int flag) |
d26493b6 | 267 | { |
e3154e97 | 268 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 269 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
fb04b91b | 270 | time64_t t; |
d26493b6 JS |
271 | |
272 | /* nilfs->ns_sem must be locked by the caller. */ | |
fb04b91b | 273 | t = ktime_get_real_seconds(); |
b2ac86e1 | 274 | nilfs->ns_sbwtime = t; |
e339ad31 RK |
275 | sbp[0]->s_wtime = cpu_to_le64(t); |
276 | sbp[0]->s_sum = 0; | |
277 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
278 | (unsigned char *)sbp[0], | |
279 | nilfs->ns_sbsize)); | |
b2ac86e1 JS |
280 | if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) { |
281 | sbp[1]->s_wtime = sbp[0]->s_wtime; | |
282 | sbp[1]->s_sum = 0; | |
283 | sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
284 | (unsigned char *)sbp[1], | |
285 | nilfs->ns_sbsize)); | |
e339ad31 | 286 | } |
e605f0a7 | 287 | clear_nilfs_sb_dirty(nilfs); |
e2c7617a AR |
288 | nilfs->ns_flushed_device = 1; |
289 | /* make sure store to ns_flushed_device cannot be reordered */ | |
290 | smp_wmb(); | |
f7545144 | 291 | return nilfs_sync_super(sb, flag); |
783f6184 RK |
292 | } |
293 | ||
7ecaa46c RK |
294 | /** |
295 | * nilfs_cleanup_super() - write filesystem state for cleanup | |
f7545144 | 296 | * @sb: super block instance to be unmounted or degraded to read-only |
7ecaa46c RK |
297 | * |
298 | * This function restores state flags in the on-disk super block. | |
299 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the | |
300 | * filesystem was not clean previously. | |
301 | */ | |
f7545144 | 302 | int nilfs_cleanup_super(struct super_block *sb) |
7ecaa46c | 303 | { |
e3154e97 | 304 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 305 | struct nilfs_super_block **sbp; |
b2ac86e1 | 306 | int flag = NILFS_SB_COMMIT; |
d26493b6 | 307 | int ret = -EIO; |
7ecaa46c | 308 | |
f7545144 | 309 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 | 310 | if (sbp) { |
f7545144 RK |
311 | sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state); |
312 | nilfs_set_log_cursor(sbp[0], nilfs); | |
b2ac86e1 JS |
313 | if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { |
314 | /* | |
315 | * make the "clean" flag also to the opposite | |
316 | * super block if both super blocks point to | |
317 | * the same checkpoint. | |
318 | */ | |
319 | sbp[1]->s_state = sbp[0]->s_state; | |
320 | flag = NILFS_SB_COMMIT_ALL; | |
321 | } | |
f7545144 | 322 | ret = nilfs_commit_super(sb, flag); |
d26493b6 | 323 | } |
7ecaa46c RK |
324 | return ret; |
325 | } | |
326 | ||
cfb0a4bf RK |
327 | /** |
328 | * nilfs_move_2nd_super - relocate secondary super block | |
329 | * @sb: super block instance | |
330 | * @sb2off: new offset of the secondary super block (in bytes) | |
331 | */ | |
332 | static int nilfs_move_2nd_super(struct super_block *sb, loff_t sb2off) | |
333 | { | |
334 | struct the_nilfs *nilfs = sb->s_fs_info; | |
335 | struct buffer_head *nsbh; | |
336 | struct nilfs_super_block *nsbp; | |
337 | sector_t blocknr, newblocknr; | |
338 | unsigned long offset; | |
4f05028f | 339 | int sb2i; /* array index of the secondary superblock */ |
cfb0a4bf RK |
340 | int ret = 0; |
341 | ||
342 | /* nilfs->ns_sem must be locked by the caller. */ | |
343 | if (nilfs->ns_sbh[1] && | |
344 | nilfs->ns_sbh[1]->b_blocknr > nilfs->ns_first_data_block) { | |
345 | sb2i = 1; | |
346 | blocknr = nilfs->ns_sbh[1]->b_blocknr; | |
347 | } else if (nilfs->ns_sbh[0]->b_blocknr > nilfs->ns_first_data_block) { | |
348 | sb2i = 0; | |
349 | blocknr = nilfs->ns_sbh[0]->b_blocknr; | |
4f05028f RK |
350 | } else { |
351 | sb2i = -1; | |
352 | blocknr = 0; | |
cfb0a4bf RK |
353 | } |
354 | if (sb2i >= 0 && (u64)blocknr << nilfs->ns_blocksize_bits == sb2off) | |
355 | goto out; /* super block location is unchanged */ | |
356 | ||
357 | /* Get new super block buffer */ | |
358 | newblocknr = sb2off >> nilfs->ns_blocksize_bits; | |
359 | offset = sb2off & (nilfs->ns_blocksize - 1); | |
360 | nsbh = sb_getblk(sb, newblocknr); | |
361 | if (!nsbh) { | |
feee880f RK |
362 | nilfs_msg(sb, KERN_WARNING, |
363 | "unable to move secondary superblock to block %llu", | |
364 | (unsigned long long)newblocknr); | |
cfb0a4bf RK |
365 | ret = -EIO; |
366 | goto out; | |
367 | } | |
368 | nsbp = (void *)nsbh->b_data + offset; | |
369 | memset(nsbp, 0, nilfs->ns_blocksize); | |
370 | ||
371 | if (sb2i >= 0) { | |
372 | memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize); | |
373 | brelse(nilfs->ns_sbh[sb2i]); | |
374 | nilfs->ns_sbh[sb2i] = nsbh; | |
375 | nilfs->ns_sbp[sb2i] = nsbp; | |
376 | } else if (nilfs->ns_sbh[0]->b_blocknr < nilfs->ns_first_data_block) { | |
377 | /* secondary super block will be restored to index 1 */ | |
378 | nilfs->ns_sbh[1] = nsbh; | |
379 | nilfs->ns_sbp[1] = nsbp; | |
380 | } else { | |
381 | brelse(nsbh); | |
382 | } | |
383 | out: | |
384 | return ret; | |
385 | } | |
386 | ||
4e33f9ea RK |
387 | /** |
388 | * nilfs_resize_fs - resize the filesystem | |
389 | * @sb: super block instance | |
390 | * @newsize: new size of the filesystem (in bytes) | |
391 | */ | |
392 | int nilfs_resize_fs(struct super_block *sb, __u64 newsize) | |
393 | { | |
394 | struct the_nilfs *nilfs = sb->s_fs_info; | |
395 | struct nilfs_super_block **sbp; | |
396 | __u64 devsize, newnsegs; | |
397 | loff_t sb2off; | |
398 | int ret; | |
399 | ||
400 | ret = -ERANGE; | |
401 | devsize = i_size_read(sb->s_bdev->bd_inode); | |
402 | if (newsize > devsize) | |
403 | goto out; | |
404 | ||
405 | /* | |
406 | * Write lock is required to protect some functions depending | |
407 | * on the number of segments, the number of reserved segments, | |
408 | * and so forth. | |
409 | */ | |
410 | down_write(&nilfs->ns_segctor_sem); | |
411 | ||
412 | sb2off = NILFS_SB2_OFFSET_BYTES(newsize); | |
413 | newnsegs = sb2off >> nilfs->ns_blocksize_bits; | |
414 | do_div(newnsegs, nilfs->ns_blocks_per_segment); | |
415 | ||
416 | ret = nilfs_sufile_resize(nilfs->ns_sufile, newnsegs); | |
417 | up_write(&nilfs->ns_segctor_sem); | |
418 | if (ret < 0) | |
419 | goto out; | |
420 | ||
421 | ret = nilfs_construct_segment(sb); | |
422 | if (ret < 0) | |
423 | goto out; | |
424 | ||
425 | down_write(&nilfs->ns_sem); | |
426 | nilfs_move_2nd_super(sb, sb2off); | |
427 | ret = -EIO; | |
428 | sbp = nilfs_prepare_super(sb, 0); | |
429 | if (likely(sbp)) { | |
430 | nilfs_set_log_cursor(sbp[0], nilfs); | |
431 | /* | |
432 | * Drop NILFS_RESIZE_FS flag for compatibility with | |
433 | * mount-time resize which may be implemented in a | |
434 | * future release. | |
435 | */ | |
436 | sbp[0]->s_state = cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & | |
437 | ~NILFS_RESIZE_FS); | |
438 | sbp[0]->s_dev_size = cpu_to_le64(newsize); | |
439 | sbp[0]->s_nsegments = cpu_to_le64(nilfs->ns_nsegments); | |
440 | if (sbp[1]) | |
441 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
442 | ret = nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); | |
443 | } | |
444 | up_write(&nilfs->ns_sem); | |
445 | ||
446 | /* | |
447 | * Reset the range of allocatable segments last. This order | |
448 | * is important in the case of expansion because the secondary | |
449 | * superblock must be protected from log write until migration | |
450 | * completes. | |
451 | */ | |
452 | if (!ret) | |
453 | nilfs_sufile_set_alloc_range(nilfs->ns_sufile, 0, newnsegs - 1); | |
454 | out: | |
455 | return ret; | |
456 | } | |
457 | ||
783f6184 RK |
458 | static void nilfs_put_super(struct super_block *sb) |
459 | { | |
e3154e97 | 460 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 461 | |
f7545144 | 462 | nilfs_detach_log_writer(sb); |
783f6184 | 463 | |
bc98a42c | 464 | if (!sb_rdonly(sb)) { |
783f6184 | 465 | down_write(&nilfs->ns_sem); |
f7545144 | 466 | nilfs_cleanup_super(sb); |
783f6184 RK |
467 | up_write(&nilfs->ns_sem); |
468 | } | |
469 | ||
f1e89c86 RK |
470 | iput(nilfs->ns_sufile); |
471 | iput(nilfs->ns_cpfile); | |
472 | iput(nilfs->ns_dat); | |
473 | ||
348fe8da | 474 | destroy_nilfs(nilfs); |
783f6184 | 475 | sb->s_fs_info = NULL; |
783f6184 RK |
476 | } |
477 | ||
783f6184 RK |
478 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
479 | { | |
e3154e97 | 480 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 481 | struct nilfs_super_block **sbp; |
783f6184 RK |
482 | int err = 0; |
483 | ||
484 | /* This function is called when super block should be written back */ | |
485 | if (wait) | |
486 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
487 | |
488 | down_write(&nilfs->ns_sem); | |
d26493b6 | 489 | if (nilfs_sb_dirty(nilfs)) { |
f7545144 | 490 | sbp = nilfs_prepare_super(sb, nilfs_sb_will_flip(nilfs)); |
b2ac86e1 JS |
491 | if (likely(sbp)) { |
492 | nilfs_set_log_cursor(sbp[0], nilfs); | |
f7545144 | 493 | nilfs_commit_super(sb, NILFS_SB_COMMIT); |
b2ac86e1 | 494 | } |
d26493b6 | 495 | } |
6233caa9 JS |
496 | up_write(&nilfs->ns_sem); |
497 | ||
e2c7617a AR |
498 | if (!err) |
499 | err = nilfs_flush_device(nilfs); | |
500 | ||
783f6184 RK |
501 | return err; |
502 | } | |
503 | ||
f7545144 | 504 | int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt, |
4d8d9293 | 505 | struct nilfs_root **rootp) |
783f6184 | 506 | { |
e3154e97 | 507 | struct the_nilfs *nilfs = sb->s_fs_info; |
4d8d9293 | 508 | struct nilfs_root *root; |
783f6184 RK |
509 | struct nilfs_checkpoint *raw_cp; |
510 | struct buffer_head *bh_cp; | |
4d8d9293 | 511 | int err = -ENOMEM; |
783f6184 | 512 | |
4d8d9293 RK |
513 | root = nilfs_find_or_create_root( |
514 | nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); | |
515 | if (!root) | |
516 | return err; | |
783f6184 | 517 | |
e912a5b6 RK |
518 | if (root->ifile) |
519 | goto reuse; /* already attached checkpoint */ | |
783f6184 | 520 | |
1154ecbd | 521 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
522 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
523 | &bh_cp); | |
1154ecbd | 524 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
525 | if (unlikely(err)) { |
526 | if (err == -ENOENT || err == -EINVAL) { | |
feee880f RK |
527 | nilfs_msg(sb, KERN_ERR, |
528 | "Invalid checkpoint (checkpoint number=%llu)", | |
529 | (unsigned long long)cno); | |
783f6184 RK |
530 | err = -EINVAL; |
531 | } | |
532 | goto failed; | |
533 | } | |
f1e89c86 | 534 | |
f7545144 | 535 | err = nilfs_ifile_read(sb, root, nilfs->ns_inode_size, |
f1e89c86 RK |
536 | &raw_cp->cp_ifile_inode, &root->ifile); |
537 | if (err) | |
783f6184 | 538 | goto failed_bh; |
b7c06342 | 539 | |
e5f7f848 VD |
540 | atomic64_set(&root->inodes_count, |
541 | le64_to_cpu(raw_cp->cp_inodes_count)); | |
542 | atomic64_set(&root->blocks_count, | |
543 | le64_to_cpu(raw_cp->cp_blocks_count)); | |
783f6184 RK |
544 | |
545 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
4d8d9293 | 546 | |
e912a5b6 | 547 | reuse: |
4d8d9293 | 548 | *rootp = root; |
783f6184 RK |
549 | return 0; |
550 | ||
551 | failed_bh: | |
552 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
553 | failed: | |
4d8d9293 | 554 | nilfs_put_root(root); |
783f6184 RK |
555 | |
556 | return err; | |
557 | } | |
783f6184 | 558 | |
5beb6e0b RK |
559 | static int nilfs_freeze(struct super_block *sb) |
560 | { | |
e3154e97 | 561 | struct the_nilfs *nilfs = sb->s_fs_info; |
5beb6e0b RK |
562 | int err; |
563 | ||
bc98a42c | 564 | if (sb_rdonly(sb)) |
5beb6e0b | 565 | return 0; |
783f6184 | 566 | |
5beb6e0b RK |
567 | /* Mark super block clean */ |
568 | down_write(&nilfs->ns_sem); | |
f7545144 | 569 | err = nilfs_cleanup_super(sb); |
5beb6e0b | 570 | up_write(&nilfs->ns_sem); |
783f6184 RK |
571 | return err; |
572 | } | |
573 | ||
5beb6e0b | 574 | static int nilfs_unfreeze(struct super_block *sb) |
783f6184 | 575 | { |
e3154e97 | 576 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 577 | |
bc98a42c | 578 | if (sb_rdonly(sb)) |
5beb6e0b RK |
579 | return 0; |
580 | ||
581 | down_write(&nilfs->ns_sem); | |
f7545144 | 582 | nilfs_setup_super(sb, false); |
5beb6e0b RK |
583 | up_write(&nilfs->ns_sem); |
584 | return 0; | |
783f6184 RK |
585 | } |
586 | ||
783f6184 RK |
587 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
588 | { | |
589 | struct super_block *sb = dentry->d_sb; | |
2b0143b5 | 590 | struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root; |
b7c06342 | 591 | struct the_nilfs *nilfs = root->nilfs; |
c306af23 | 592 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
783f6184 RK |
593 | unsigned long long blocks; |
594 | unsigned long overhead; | |
595 | unsigned long nrsvblocks; | |
596 | sector_t nfreeblocks; | |
c7ef972c | 597 | u64 nmaxinodes, nfreeinodes; |
783f6184 RK |
598 | int err; |
599 | ||
600 | /* | |
601 | * Compute all of the segment blocks | |
602 | * | |
603 | * The blocks before first segment and after last segment | |
604 | * are excluded. | |
605 | */ | |
606 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
607 | - nilfs->ns_first_data_block; | |
608 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
609 | ||
610 | /* | |
611 | * Compute the overhead | |
612 | * | |
7a65004b | 613 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
614 | * We must count them as the overhead. |
615 | */ | |
616 | overhead = 0; | |
617 | ||
618 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
619 | if (unlikely(err)) | |
620 | return err; | |
621 | ||
c7ef972c VD |
622 | err = nilfs_ifile_count_free_inodes(root->ifile, |
623 | &nmaxinodes, &nfreeinodes); | |
624 | if (unlikely(err)) { | |
feee880f RK |
625 | nilfs_msg(sb, KERN_WARNING, |
626 | "failed to count free inodes: err=%d", err); | |
c7ef972c VD |
627 | if (err == -ERANGE) { |
628 | /* | |
629 | * If nilfs_palloc_count_max_entries() returns | |
630 | * -ERANGE error code then we simply treat | |
631 | * curent inodes count as maximum possible and | |
632 | * zero as free inodes value. | |
633 | */ | |
e5f7f848 | 634 | nmaxinodes = atomic64_read(&root->inodes_count); |
c7ef972c VD |
635 | nfreeinodes = 0; |
636 | err = 0; | |
637 | } else | |
638 | return err; | |
639 | } | |
640 | ||
783f6184 RK |
641 | buf->f_type = NILFS_SUPER_MAGIC; |
642 | buf->f_bsize = sb->s_blocksize; | |
643 | buf->f_blocks = blocks - overhead; | |
644 | buf->f_bfree = nfreeblocks; | |
645 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
646 | (buf->f_bfree - nrsvblocks) : 0; | |
c7ef972c VD |
647 | buf->f_files = nmaxinodes; |
648 | buf->f_ffree = nfreeinodes; | |
783f6184 | 649 | buf->f_namelen = NILFS_NAME_LEN; |
c306af23 RK |
650 | buf->f_fsid.val[0] = (u32)id; |
651 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
652 | ||
783f6184 RK |
653 | return 0; |
654 | } | |
655 | ||
34c80b1d | 656 | static int nilfs_show_options(struct seq_file *seq, struct dentry *dentry) |
b58a285b | 657 | { |
34c80b1d | 658 | struct super_block *sb = dentry->d_sb; |
e3154e97 | 659 | struct the_nilfs *nilfs = sb->s_fs_info; |
2b0143b5 | 660 | struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root; |
b58a285b | 661 | |
3b2ce58b | 662 | if (!nilfs_test_opt(nilfs, BARRIER)) |
c6b4d57d | 663 | seq_puts(seq, ",nobarrier"); |
f11459ad RK |
664 | if (root->cno != NILFS_CPTREE_CURRENT_CNO) |
665 | seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno); | |
3b2ce58b | 666 | if (nilfs_test_opt(nilfs, ERRORS_PANIC)) |
c6b4d57d | 667 | seq_puts(seq, ",errors=panic"); |
3b2ce58b | 668 | if (nilfs_test_opt(nilfs, ERRORS_CONT)) |
c6b4d57d | 669 | seq_puts(seq, ",errors=continue"); |
3b2ce58b | 670 | if (nilfs_test_opt(nilfs, STRICT_ORDER)) |
c6b4d57d | 671 | seq_puts(seq, ",order=strict"); |
3b2ce58b | 672 | if (nilfs_test_opt(nilfs, NORECOVERY)) |
c6b4d57d | 673 | seq_puts(seq, ",norecovery"); |
3b2ce58b | 674 | if (nilfs_test_opt(nilfs, DISCARD)) |
c6b4d57d | 675 | seq_puts(seq, ",discard"); |
b58a285b JS |
676 | |
677 | return 0; | |
678 | } | |
679 | ||
b87221de | 680 | static const struct super_operations nilfs_sops = { |
783f6184 | 681 | .alloc_inode = nilfs_alloc_inode, |
977c3d18 | 682 | .free_inode = nilfs_free_inode, |
783f6184 | 683 | .dirty_inode = nilfs_dirty_inode, |
6fd1e5c9 | 684 | .evict_inode = nilfs_evict_inode, |
783f6184 | 685 | .put_super = nilfs_put_super, |
783f6184 | 686 | .sync_fs = nilfs_sync_fs, |
5beb6e0b RK |
687 | .freeze_fs = nilfs_freeze, |
688 | .unfreeze_fs = nilfs_unfreeze, | |
783f6184 RK |
689 | .statfs = nilfs_statfs, |
690 | .remount_fs = nilfs_remount, | |
b58a285b | 691 | .show_options = nilfs_show_options |
783f6184 RK |
692 | }; |
693 | ||
783f6184 RK |
694 | enum { |
695 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
773bc4f3 | 696 | Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
802d3177 | 697 | Opt_discard, Opt_nodiscard, Opt_err, |
783f6184 RK |
698 | }; |
699 | ||
700 | static match_table_t tokens = { | |
701 | {Opt_err_cont, "errors=continue"}, | |
702 | {Opt_err_panic, "errors=panic"}, | |
703 | {Opt_err_ro, "errors=remount-ro"}, | |
773bc4f3 | 704 | {Opt_barrier, "barrier"}, |
91f1953b | 705 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
706 | {Opt_snapshot, "cp=%u"}, |
707 | {Opt_order, "order=%s"}, | |
0234576d | 708 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 709 | {Opt_discard, "discard"}, |
802d3177 | 710 | {Opt_nodiscard, "nodiscard"}, |
783f6184 RK |
711 | {Opt_err, NULL} |
712 | }; | |
713 | ||
7c017457 | 714 | static int parse_options(char *options, struct super_block *sb, int is_remount) |
783f6184 | 715 | { |
e3154e97 | 716 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 RK |
717 | char *p; |
718 | substring_t args[MAX_OPT_ARGS]; | |
783f6184 RK |
719 | |
720 | if (!options) | |
721 | return 1; | |
722 | ||
723 | while ((p = strsep(&options, ",")) != NULL) { | |
724 | int token; | |
4ad364ca | 725 | |
783f6184 RK |
726 | if (!*p) |
727 | continue; | |
728 | ||
729 | token = match_token(p, tokens, args); | |
730 | switch (token) { | |
773bc4f3 | 731 | case Opt_barrier: |
3b2ce58b | 732 | nilfs_set_opt(nilfs, BARRIER); |
773bc4f3 | 733 | break; |
91f1953b | 734 | case Opt_nobarrier: |
3b2ce58b | 735 | nilfs_clear_opt(nilfs, BARRIER); |
783f6184 RK |
736 | break; |
737 | case Opt_order: | |
738 | if (strcmp(args[0].from, "relaxed") == 0) | |
739 | /* Ordered data semantics */ | |
3b2ce58b | 740 | nilfs_clear_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
741 | else if (strcmp(args[0].from, "strict") == 0) |
742 | /* Strict in-order semantics */ | |
3b2ce58b | 743 | nilfs_set_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
744 | else |
745 | return 0; | |
746 | break; | |
747 | case Opt_err_panic: | |
3b2ce58b | 748 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC); |
783f6184 RK |
749 | break; |
750 | case Opt_err_ro: | |
3b2ce58b | 751 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO); |
783f6184 RK |
752 | break; |
753 | case Opt_err_cont: | |
3b2ce58b | 754 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT); |
783f6184 RK |
755 | break; |
756 | case Opt_snapshot: | |
7c017457 | 757 | if (is_remount) { |
feee880f RK |
758 | nilfs_msg(sb, KERN_ERR, |
759 | "\"%s\" option is invalid for remount", | |
760 | p); | |
783f6184 | 761 | return 0; |
7c017457 | 762 | } |
783f6184 | 763 | break; |
0234576d | 764 | case Opt_norecovery: |
3b2ce58b | 765 | nilfs_set_opt(nilfs, NORECOVERY); |
0234576d | 766 | break; |
e902ec99 | 767 | case Opt_discard: |
3b2ce58b | 768 | nilfs_set_opt(nilfs, DISCARD); |
e902ec99 | 769 | break; |
802d3177 | 770 | case Opt_nodiscard: |
3b2ce58b | 771 | nilfs_clear_opt(nilfs, DISCARD); |
802d3177 | 772 | break; |
783f6184 | 773 | default: |
feee880f RK |
774 | nilfs_msg(sb, KERN_ERR, |
775 | "unrecognized mount option \"%s\"", p); | |
783f6184 RK |
776 | return 0; |
777 | } | |
778 | } | |
779 | return 1; | |
780 | } | |
781 | ||
782 | static inline void | |
3b2ce58b | 783 | nilfs_set_default_options(struct super_block *sb, |
783f6184 RK |
784 | struct nilfs_super_block *sbp) |
785 | { | |
e3154e97 | 786 | struct the_nilfs *nilfs = sb->s_fs_info; |
3b2ce58b RK |
787 | |
788 | nilfs->ns_mount_opt = | |
277a6a34 | 789 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
790 | } |
791 | ||
f7545144 | 792 | static int nilfs_setup_super(struct super_block *sb, int is_mount) |
783f6184 | 793 | { |
e3154e97 | 794 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 JS |
795 | struct nilfs_super_block **sbp; |
796 | int max_mnt_count; | |
797 | int mnt_count; | |
798 | ||
799 | /* nilfs->ns_sem must be locked by the caller. */ | |
f7545144 | 800 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 JS |
801 | if (!sbp) |
802 | return -EIO; | |
803 | ||
5beb6e0b RK |
804 | if (!is_mount) |
805 | goto skip_mount_setup; | |
806 | ||
d26493b6 JS |
807 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); |
808 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); | |
783f6184 | 809 | |
f50a4c81 | 810 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
feee880f | 811 | nilfs_msg(sb, KERN_WARNING, "mounting fs with errors"); |
783f6184 RK |
812 | #if 0 |
813 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
feee880f | 814 | nilfs_msg(sb, KERN_WARNING, "maximal mount count reached"); |
783f6184 RK |
815 | #endif |
816 | } | |
817 | if (!max_mnt_count) | |
d26493b6 | 818 | sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
783f6184 | 819 | |
d26493b6 | 820 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
21a1a52d | 821 | sbp[0]->s_mtime = cpu_to_le64(ktime_get_real_seconds()); |
5beb6e0b RK |
822 | |
823 | skip_mount_setup: | |
d26493b6 JS |
824 | sbp[0]->s_state = |
825 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); | |
b2ac86e1 | 826 | /* synchronize sbp[1] with sbp[0] */ |
0ca7a5b9 RK |
827 | if (sbp[1]) |
828 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
f7545144 | 829 | return nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); |
783f6184 RK |
830 | } |
831 | ||
e339ad31 RK |
832 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
833 | u64 pos, int blocksize, | |
834 | struct buffer_head **pbh) | |
783f6184 | 835 | { |
e339ad31 RK |
836 | unsigned long long sb_index = pos; |
837 | unsigned long offset; | |
783f6184 | 838 | |
e339ad31 | 839 | offset = do_div(sb_index, blocksize); |
783f6184 | 840 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 841 | if (!*pbh) |
783f6184 | 842 | return NULL; |
783f6184 RK |
843 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
844 | } | |
845 | ||
783f6184 RK |
846 | int nilfs_store_magic_and_option(struct super_block *sb, |
847 | struct nilfs_super_block *sbp, | |
848 | char *data) | |
849 | { | |
e3154e97 | 850 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 851 | |
783f6184 RK |
852 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
853 | ||
854 | /* FS independent flags */ | |
855 | #ifdef NILFS_ATIME_DISABLE | |
1751e8a6 | 856 | sb->s_flags |= SB_NOATIME; |
783f6184 RK |
857 | #endif |
858 | ||
3b2ce58b | 859 | nilfs_set_default_options(sb, sbp); |
783f6184 | 860 | |
574e6c31 RK |
861 | nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid); |
862 | nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid); | |
863 | nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval); | |
864 | nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max); | |
783f6184 | 865 | |
c9cb9b5c | 866 | return !parse_options(data, sb, 0) ? -EINVAL : 0; |
783f6184 RK |
867 | } |
868 | ||
c5ca48aa RK |
869 | int nilfs_check_feature_compatibility(struct super_block *sb, |
870 | struct nilfs_super_block *sbp) | |
871 | { | |
872 | __u64 features; | |
873 | ||
874 | features = le64_to_cpu(sbp->s_feature_incompat) & | |
875 | ~NILFS_FEATURE_INCOMPAT_SUPP; | |
876 | if (features) { | |
feee880f RK |
877 | nilfs_msg(sb, KERN_ERR, |
878 | "couldn't mount because of unsupported optional features (%llx)", | |
879 | (unsigned long long)features); | |
c5ca48aa RK |
880 | return -EINVAL; |
881 | } | |
882 | features = le64_to_cpu(sbp->s_feature_compat_ro) & | |
883 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
bc98a42c | 884 | if (!sb_rdonly(sb) && features) { |
feee880f RK |
885 | nilfs_msg(sb, KERN_ERR, |
886 | "couldn't mount RDWR because of unsupported optional features (%llx)", | |
887 | (unsigned long long)features); | |
c5ca48aa RK |
888 | return -EINVAL; |
889 | } | |
890 | return 0; | |
891 | } | |
892 | ||
367ea334 RK |
893 | static int nilfs_get_root_dentry(struct super_block *sb, |
894 | struct nilfs_root *root, | |
895 | struct dentry **root_dentry) | |
896 | { | |
897 | struct inode *inode; | |
898 | struct dentry *dentry; | |
899 | int ret = 0; | |
900 | ||
901 | inode = nilfs_iget(sb, root, NILFS_ROOT_INO); | |
902 | if (IS_ERR(inode)) { | |
367ea334 | 903 | ret = PTR_ERR(inode); |
feee880f | 904 | nilfs_msg(sb, KERN_ERR, "error %d getting root inode", ret); |
367ea334 RK |
905 | goto out; |
906 | } | |
907 | if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { | |
908 | iput(inode); | |
feee880f | 909 | nilfs_msg(sb, KERN_ERR, "corrupt root inode"); |
367ea334 RK |
910 | ret = -EINVAL; |
911 | goto out; | |
912 | } | |
913 | ||
f11459ad RK |
914 | if (root->cno == NILFS_CPTREE_CURRENT_CNO) { |
915 | dentry = d_find_alias(inode); | |
916 | if (!dentry) { | |
48fde701 | 917 | dentry = d_make_root(inode); |
f11459ad | 918 | if (!dentry) { |
f11459ad RK |
919 | ret = -ENOMEM; |
920 | goto failed_dentry; | |
921 | } | |
922 | } else { | |
923 | iput(inode); | |
924 | } | |
925 | } else { | |
1a0a397e | 926 | dentry = d_obtain_root(inode); |
f11459ad RK |
927 | if (IS_ERR(dentry)) { |
928 | ret = PTR_ERR(dentry); | |
929 | goto failed_dentry; | |
930 | } | |
367ea334 RK |
931 | } |
932 | *root_dentry = dentry; | |
933 | out: | |
934 | return ret; | |
f11459ad RK |
935 | |
936 | failed_dentry: | |
feee880f | 937 | nilfs_msg(sb, KERN_ERR, "error %d getting root dentry", ret); |
f11459ad | 938 | goto out; |
367ea334 RK |
939 | } |
940 | ||
ab4d8f7e RK |
941 | static int nilfs_attach_snapshot(struct super_block *s, __u64 cno, |
942 | struct dentry **root_dentry) | |
943 | { | |
e3154e97 | 944 | struct the_nilfs *nilfs = s->s_fs_info; |
ab4d8f7e RK |
945 | struct nilfs_root *root; |
946 | int ret; | |
947 | ||
572d8b39 RK |
948 | mutex_lock(&nilfs->ns_snapshot_mount_mutex); |
949 | ||
ab4d8f7e RK |
950 | down_read(&nilfs->ns_segctor_sem); |
951 | ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno); | |
952 | up_read(&nilfs->ns_segctor_sem); | |
953 | if (ret < 0) { | |
954 | ret = (ret == -ENOENT) ? -EINVAL : ret; | |
955 | goto out; | |
956 | } else if (!ret) { | |
feee880f RK |
957 | nilfs_msg(s, KERN_ERR, |
958 | "The specified checkpoint is not a snapshot (checkpoint number=%llu)", | |
959 | (unsigned long long)cno); | |
ab4d8f7e RK |
960 | ret = -EINVAL; |
961 | goto out; | |
962 | } | |
963 | ||
f7545144 | 964 | ret = nilfs_attach_checkpoint(s, cno, false, &root); |
ab4d8f7e | 965 | if (ret) { |
feee880f RK |
966 | nilfs_msg(s, KERN_ERR, |
967 | "error %d while loading snapshot (checkpoint number=%llu)", | |
968 | ret, (unsigned long long)cno); | |
ab4d8f7e RK |
969 | goto out; |
970 | } | |
971 | ret = nilfs_get_root_dentry(s, root, root_dentry); | |
972 | nilfs_put_root(root); | |
973 | out: | |
572d8b39 | 974 | mutex_unlock(&nilfs->ns_snapshot_mount_mutex); |
ab4d8f7e RK |
975 | return ret; |
976 | } | |
977 | ||
f11459ad | 978 | /** |
e95c311e | 979 | * nilfs_tree_is_busy() - try to shrink dentries of a checkpoint |
f11459ad RK |
980 | * @root_dentry: root dentry of the tree to be shrunk |
981 | * | |
982 | * This function returns true if the tree was in-use. | |
983 | */ | |
e95c311e | 984 | static bool nilfs_tree_is_busy(struct dentry *root_dentry) |
f11459ad | 985 | { |
f11459ad | 986 | shrink_dcache_parent(root_dentry); |
e95c311e | 987 | return d_count(root_dentry) > 1; |
f11459ad RK |
988 | } |
989 | ||
032dbb3b RK |
990 | int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno) |
991 | { | |
e3154e97 | 992 | struct the_nilfs *nilfs = sb->s_fs_info; |
032dbb3b RK |
993 | struct nilfs_root *root; |
994 | struct inode *inode; | |
995 | struct dentry *dentry; | |
996 | int ret; | |
997 | ||
3377f843 | 998 | if (cno > nilfs->ns_cno) |
032dbb3b RK |
999 | return false; |
1000 | ||
1001 | if (cno >= nilfs_last_cno(nilfs)) | |
1002 | return true; /* protect recent checkpoints */ | |
1003 | ||
1004 | ret = false; | |
e3154e97 | 1005 | root = nilfs_lookup_root(nilfs, cno); |
032dbb3b RK |
1006 | if (root) { |
1007 | inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO); | |
1008 | if (inode) { | |
1009 | dentry = d_find_alias(inode); | |
1010 | if (dentry) { | |
e95c311e | 1011 | ret = nilfs_tree_is_busy(dentry); |
032dbb3b RK |
1012 | dput(dentry); |
1013 | } | |
1014 | iput(inode); | |
1015 | } | |
1016 | nilfs_put_root(root); | |
1017 | } | |
1018 | return ret; | |
1019 | } | |
1020 | ||
783f6184 RK |
1021 | /** |
1022 | * nilfs_fill_super() - initialize a super block instance | |
1023 | * @sb: super_block | |
1024 | * @data: mount options | |
1025 | * @silent: silent mode flag | |
783f6184 | 1026 | * |
aa7dfb89 | 1027 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
1028 | * So, the recovery process is protected from other simultaneous mounts. |
1029 | */ | |
1030 | static int | |
348fe8da | 1031 | nilfs_fill_super(struct super_block *sb, void *data, int silent) |
783f6184 | 1032 | { |
348fe8da | 1033 | struct the_nilfs *nilfs; |
4d8d9293 | 1034 | struct nilfs_root *fsroot; |
783f6184 RK |
1035 | __u64 cno; |
1036 | int err; | |
1037 | ||
6625689e | 1038 | nilfs = alloc_nilfs(sb); |
e3154e97 | 1039 | if (!nilfs) |
783f6184 RK |
1040 | return -ENOMEM; |
1041 | ||
e3154e97 | 1042 | sb->s_fs_info = nilfs; |
783f6184 | 1043 | |
f7545144 | 1044 | err = init_nilfs(nilfs, sb, (char *)data); |
783f6184 | 1045 | if (err) |
348fe8da | 1046 | goto failed_nilfs; |
783f6184 | 1047 | |
783f6184 RK |
1048 | sb->s_op = &nilfs_sops; |
1049 | sb->s_export_op = &nilfs_export_ops; | |
1050 | sb->s_root = NULL; | |
61239230 | 1051 | sb->s_time_gran = 1; |
8de52778 | 1052 | sb->s_max_links = NILFS_LINK_MAX; |
026a7d63 | 1053 | |
0546c537 | 1054 | sb->s_bdi = bdi_get(sb->s_bdev->bd_bdi); |
783f6184 | 1055 | |
f7545144 | 1056 | err = load_nilfs(nilfs, sb); |
f50a4c81 | 1057 | if (err) |
348fe8da | 1058 | goto failed_nilfs; |
f50a4c81 | 1059 | |
783f6184 | 1060 | cno = nilfs_last_cno(nilfs); |
f7545144 | 1061 | err = nilfs_attach_checkpoint(sb, cno, true, &fsroot); |
783f6184 | 1062 | if (err) { |
feee880f RK |
1063 | nilfs_msg(sb, KERN_ERR, |
1064 | "error %d while loading last checkpoint (checkpoint number=%llu)", | |
1065 | err, (unsigned long long)cno); | |
f1e89c86 | 1066 | goto failed_unload; |
783f6184 RK |
1067 | } |
1068 | ||
bc98a42c | 1069 | if (!sb_rdonly(sb)) { |
f7545144 | 1070 | err = nilfs_attach_log_writer(sb, fsroot); |
783f6184 RK |
1071 | if (err) |
1072 | goto failed_checkpoint; | |
1073 | } | |
1074 | ||
367ea334 RK |
1075 | err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root); |
1076 | if (err) | |
783f6184 | 1077 | goto failed_segctor; |
783f6184 | 1078 | |
4d8d9293 | 1079 | nilfs_put_root(fsroot); |
783f6184 | 1080 | |
bc98a42c | 1081 | if (!sb_rdonly(sb)) { |
783f6184 | 1082 | down_write(&nilfs->ns_sem); |
f7545144 | 1083 | nilfs_setup_super(sb, true); |
783f6184 RK |
1084 | up_write(&nilfs->ns_sem); |
1085 | } | |
1086 | ||
783f6184 RK |
1087 | return 0; |
1088 | ||
783f6184 | 1089 | failed_segctor: |
f7545144 | 1090 | nilfs_detach_log_writer(sb); |
783f6184 RK |
1091 | |
1092 | failed_checkpoint: | |
4d8d9293 | 1093 | nilfs_put_root(fsroot); |
783f6184 | 1094 | |
f1e89c86 RK |
1095 | failed_unload: |
1096 | iput(nilfs->ns_sufile); | |
1097 | iput(nilfs->ns_cpfile); | |
1098 | iput(nilfs->ns_dat); | |
1099 | ||
348fe8da RK |
1100 | failed_nilfs: |
1101 | destroy_nilfs(nilfs); | |
783f6184 RK |
1102 | return err; |
1103 | } | |
1104 | ||
1105 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
1106 | { | |
e3154e97 | 1107 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 1108 | unsigned long old_sb_flags; |
06df0f99 | 1109 | unsigned long old_mount_opt; |
f11459ad | 1110 | int err; |
783f6184 | 1111 | |
02b9984d | 1112 | sync_filesystem(sb); |
783f6184 | 1113 | old_sb_flags = sb->s_flags; |
3b2ce58b | 1114 | old_mount_opt = nilfs->ns_mount_opt; |
783f6184 | 1115 | |
7c017457 | 1116 | if (!parse_options(data, sb, 1)) { |
783f6184 RK |
1117 | err = -EINVAL; |
1118 | goto restore_opts; | |
1119 | } | |
1751e8a6 | 1120 | sb->s_flags = (sb->s_flags & ~SB_POSIXACL); |
783f6184 | 1121 | |
d240e067 | 1122 | err = -EINVAL; |
783f6184 | 1123 | |
0234576d | 1124 | if (!nilfs_valid_fs(nilfs)) { |
feee880f RK |
1125 | nilfs_msg(sb, KERN_WARNING, |
1126 | "couldn't remount because the filesystem is in an incomplete recovery state"); | |
0234576d RK |
1127 | goto restore_opts; |
1128 | } | |
1129 | ||
1751e8a6 | 1130 | if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
783f6184 | 1131 | goto out; |
1751e8a6 | 1132 | if (*flags & SB_RDONLY) { |
f7545144 RK |
1133 | /* Shutting down log writer */ |
1134 | nilfs_detach_log_writer(sb); | |
1751e8a6 | 1135 | sb->s_flags |= SB_RDONLY; |
783f6184 | 1136 | |
783f6184 RK |
1137 | /* |
1138 | * Remounting a valid RW partition RDONLY, so set | |
1139 | * the RDONLY flag and then mark the partition as valid again. | |
1140 | */ | |
1141 | down_write(&nilfs->ns_sem); | |
f7545144 | 1142 | nilfs_cleanup_super(sb); |
783f6184 RK |
1143 | up_write(&nilfs->ns_sem); |
1144 | } else { | |
c5ca48aa | 1145 | __u64 features; |
e912a5b6 | 1146 | struct nilfs_root *root; |
c5ca48aa | 1147 | |
783f6184 RK |
1148 | /* |
1149 | * Mounting a RDONLY partition read-write, so reread and | |
1150 | * store the current valid flag. (It may have been changed | |
1151 | * by fsck since we originally mounted the partition.) | |
1152 | */ | |
c5ca48aa RK |
1153 | down_read(&nilfs->ns_sem); |
1154 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & | |
1155 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
1156 | up_read(&nilfs->ns_sem); | |
1157 | if (features) { | |
feee880f RK |
1158 | nilfs_msg(sb, KERN_WARNING, |
1159 | "couldn't remount RDWR because of unsupported optional features (%llx)", | |
1160 | (unsigned long long)features); | |
c5ca48aa RK |
1161 | err = -EROFS; |
1162 | goto restore_opts; | |
1163 | } | |
1164 | ||
1751e8a6 | 1165 | sb->s_flags &= ~SB_RDONLY; |
783f6184 | 1166 | |
2b0143b5 | 1167 | root = NILFS_I(d_inode(sb->s_root))->i_root; |
f7545144 | 1168 | err = nilfs_attach_log_writer(sb, root); |
783f6184 | 1169 | if (err) |
e59399d0 | 1170 | goto restore_opts; |
783f6184 RK |
1171 | |
1172 | down_write(&nilfs->ns_sem); | |
f7545144 | 1173 | nilfs_setup_super(sb, true); |
783f6184 | 1174 | up_write(&nilfs->ns_sem); |
783f6184 RK |
1175 | } |
1176 | out: | |
1177 | return 0; | |
1178 | ||
783f6184 RK |
1179 | restore_opts: |
1180 | sb->s_flags = old_sb_flags; | |
3b2ce58b | 1181 | nilfs->ns_mount_opt = old_mount_opt; |
783f6184 RK |
1182 | return err; |
1183 | } | |
1184 | ||
1185 | struct nilfs_super_data { | |
1186 | struct block_device *bdev; | |
1187 | __u64 cno; | |
1188 | int flags; | |
1189 | }; | |
1190 | ||
a7d3f104 RK |
1191 | static int nilfs_parse_snapshot_option(const char *option, |
1192 | const substring_t *arg, | |
1193 | struct nilfs_super_data *sd) | |
1194 | { | |
1195 | unsigned long long val; | |
1196 | const char *msg = NULL; | |
1197 | int err; | |
1198 | ||
1751e8a6 | 1199 | if (!(sd->flags & SB_RDONLY)) { |
a7d3f104 RK |
1200 | msg = "read-only option is not specified"; |
1201 | goto parse_error; | |
1202 | } | |
1203 | ||
1204 | err = kstrtoull(arg->from, 0, &val); | |
1205 | if (err) { | |
1206 | if (err == -ERANGE) | |
1207 | msg = "too large checkpoint number"; | |
1208 | else | |
1209 | msg = "malformed argument"; | |
1210 | goto parse_error; | |
1211 | } else if (val == 0) { | |
1212 | msg = "invalid checkpoint number 0"; | |
1213 | goto parse_error; | |
1214 | } | |
1215 | sd->cno = val; | |
1216 | return 0; | |
1217 | ||
1218 | parse_error: | |
1219 | nilfs_msg(NULL, KERN_ERR, "invalid option \"%s\": %s", option, msg); | |
1220 | return 1; | |
1221 | } | |
1222 | ||
783f6184 RK |
1223 | /** |
1224 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
1225 | * @data: mount options | |
1226 | * @sd: nilfs_super_data | |
1227 | */ | |
1228 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
1229 | { | |
1230 | char *p, *options = data; | |
1231 | substring_t args[MAX_OPT_ARGS]; | |
c05dbfc2 | 1232 | int token; |
783f6184 RK |
1233 | int ret = 0; |
1234 | ||
1235 | do { | |
1236 | p = strsep(&options, ","); | |
1237 | if (p != NULL && *p) { | |
1238 | token = match_token(p, tokens, args); | |
a7d3f104 RK |
1239 | if (token == Opt_snapshot) |
1240 | ret = nilfs_parse_snapshot_option(p, &args[0], | |
1241 | sd); | |
783f6184 RK |
1242 | } |
1243 | if (!options) | |
1244 | break; | |
1245 | BUG_ON(options == data); | |
1246 | *(options - 1) = ','; | |
1247 | } while (!ret); | |
1248 | return ret; | |
1249 | } | |
1250 | ||
1251 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1252 | { | |
f11459ad | 1253 | s->s_bdev = data; |
783f6184 RK |
1254 | s->s_dev = s->s_bdev->bd_dev; |
1255 | return 0; | |
1256 | } | |
1257 | ||
1258 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 | 1259 | { |
f11459ad | 1260 | return (void *)s->s_bdev == data; |
783f6184 RK |
1261 | } |
1262 | ||
e4c59d61 AV |
1263 | static struct dentry * |
1264 | nilfs_mount(struct file_system_type *fs_type, int flags, | |
1265 | const char *dev_name, void *data) | |
783f6184 RK |
1266 | { |
1267 | struct nilfs_super_data sd; | |
33c8e57c | 1268 | struct super_block *s; |
d4d77629 | 1269 | fmode_t mode = FMODE_READ | FMODE_EXCL; |
f11459ad RK |
1270 | struct dentry *root_dentry; |
1271 | int err, s_new = false; | |
783f6184 | 1272 | |
1751e8a6 | 1273 | if (!(flags & SB_RDONLY)) |
13e90559 RK |
1274 | mode |= FMODE_WRITE; |
1275 | ||
d4d77629 | 1276 | sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type); |
d6d4c19c | 1277 | if (IS_ERR(sd.bdev)) |
e4c59d61 | 1278 | return ERR_CAST(sd.bdev); |
783f6184 | 1279 | |
783f6184 RK |
1280 | sd.cno = 0; |
1281 | sd.flags = flags; | |
1282 | if (nilfs_identify((char *)data, &sd)) { | |
1283 | err = -EINVAL; | |
1284 | goto failed; | |
1285 | } | |
1286 | ||
6dd47406 | 1287 | /* |
5beb6e0b RK |
1288 | * once the super is inserted into the list by sget, s_umount |
1289 | * will protect the lockfs code from trying to start a snapshot | |
1290 | * while we are mounting | |
6dd47406 | 1291 | */ |
5beb6e0b RK |
1292 | mutex_lock(&sd.bdev->bd_fsfreeze_mutex); |
1293 | if (sd.bdev->bd_fsfreeze_count > 0) { | |
1294 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); | |
1295 | err = -EBUSY; | |
1296 | goto failed; | |
1297 | } | |
9249e17f DH |
1298 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, flags, |
1299 | sd.bdev); | |
5beb6e0b | 1300 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); |
33c8e57c RK |
1301 | if (IS_ERR(s)) { |
1302 | err = PTR_ERR(s); | |
348fe8da | 1303 | goto failed; |
783f6184 RK |
1304 | } |
1305 | ||
1306 | if (!s->s_root) { | |
8fa7c320 | 1307 | s_new = true; |
f11459ad | 1308 | |
33c8e57c | 1309 | /* New superblock instance created */ |
4571b82c | 1310 | s->s_mode = mode; |
a1c6f057 | 1311 | snprintf(s->s_id, sizeof(s->s_id), "%pg", sd.bdev); |
783f6184 RK |
1312 | sb_set_blocksize(s, block_size(sd.bdev)); |
1313 | ||
1751e8a6 | 1314 | err = nilfs_fill_super(s, data, flags & SB_SILENT ? 1 : 0); |
783f6184 | 1315 | if (err) |
348fe8da | 1316 | goto failed_super; |
783f6184 | 1317 | |
1751e8a6 | 1318 | s->s_flags |= SB_ACTIVE; |
f11459ad | 1319 | } else if (!sd.cno) { |
e95c311e | 1320 | if (nilfs_tree_is_busy(s->s_root)) { |
1751e8a6 | 1321 | if ((flags ^ s->s_flags) & SB_RDONLY) { |
feee880f RK |
1322 | nilfs_msg(s, KERN_ERR, |
1323 | "the device already has a %s mount.", | |
bc98a42c | 1324 | sb_rdonly(s) ? "read-only" : "read/write"); |
f11459ad RK |
1325 | err = -EBUSY; |
1326 | goto failed_super; | |
1327 | } | |
e95c311e | 1328 | } else { |
f11459ad RK |
1329 | /* |
1330 | * Try remount to setup mount states if the current | |
1331 | * tree is not mounted and only snapshots use this sb. | |
1332 | */ | |
1333 | err = nilfs_remount(s, &flags, data); | |
1334 | if (err) | |
1335 | goto failed_super; | |
1336 | } | |
783f6184 RK |
1337 | } |
1338 | ||
f11459ad RK |
1339 | if (sd.cno) { |
1340 | err = nilfs_attach_snapshot(s, sd.cno, &root_dentry); | |
348fe8da | 1341 | if (err) |
f11459ad | 1342 | goto failed_super; |
f11459ad RK |
1343 | } else { |
1344 | root_dentry = dget(s->s_root); | |
783f6184 RK |
1345 | } |
1346 | ||
f11459ad | 1347 | if (!s_new) |
d4d77629 | 1348 | blkdev_put(sd.bdev, mode); |
783f6184 | 1349 | |
e4c59d61 | 1350 | return root_dentry; |
783f6184 | 1351 | |
f11459ad | 1352 | failed_super: |
a95161aa | 1353 | deactivate_locked_super(s); |
783f6184 | 1354 | |
348fe8da RK |
1355 | failed: |
1356 | if (!s_new) | |
d4d77629 | 1357 | blkdev_put(sd.bdev, mode); |
e4c59d61 | 1358 | return ERR_PTR(err); |
783f6184 RK |
1359 | } |
1360 | ||
783f6184 RK |
1361 | struct file_system_type nilfs_fs_type = { |
1362 | .owner = THIS_MODULE, | |
1363 | .name = "nilfs2", | |
e4c59d61 | 1364 | .mount = nilfs_mount, |
783f6184 RK |
1365 | .kill_sb = kill_block_super, |
1366 | .fs_flags = FS_REQUIRES_DEV, | |
1367 | }; | |
7f78e035 | 1368 | MODULE_ALIAS_FS("nilfs2"); |
783f6184 | 1369 | |
41c88bd7 | 1370 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1371 | { |
41c88bd7 | 1372 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1373 | |
41c88bd7 LH |
1374 | INIT_LIST_HEAD(&ii->i_dirty); |
1375 | #ifdef CONFIG_NILFS_XATTR | |
1376 | init_rwsem(&ii->xattr_sem); | |
1377 | #endif | |
2aa15890 | 1378 | address_space_init_once(&ii->i_btnode_cache); |
05d0e94b | 1379 | ii->i_bmap = &ii->i_bmap_data; |
41c88bd7 LH |
1380 | inode_init_once(&ii->vfs_inode); |
1381 | } | |
783f6184 | 1382 | |
41c88bd7 LH |
1383 | static void nilfs_segbuf_init_once(void *obj) |
1384 | { | |
1385 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1386 | } | |
783f6184 | 1387 | |
41c88bd7 LH |
1388 | static void nilfs_destroy_cachep(void) |
1389 | { | |
8c0a8537 KS |
1390 | /* |
1391 | * Make sure all delayed rcu free inodes are flushed before we | |
1392 | * destroy cache. | |
1393 | */ | |
1394 | rcu_barrier(); | |
1395 | ||
da80a39f JL |
1396 | kmem_cache_destroy(nilfs_inode_cachep); |
1397 | kmem_cache_destroy(nilfs_transaction_cachep); | |
1398 | kmem_cache_destroy(nilfs_segbuf_cachep); | |
1399 | kmem_cache_destroy(nilfs_btree_path_cache); | |
41c88bd7 | 1400 | } |
783f6184 | 1401 | |
41c88bd7 LH |
1402 | static int __init nilfs_init_cachep(void) |
1403 | { | |
1404 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1405 | sizeof(struct nilfs_inode_info), 0, | |
5d097056 VD |
1406 | SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, |
1407 | nilfs_inode_init_once); | |
41c88bd7 LH |
1408 | if (!nilfs_inode_cachep) |
1409 | goto fail; | |
1410 | ||
1411 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1412 | sizeof(struct nilfs_transaction_info), 0, | |
1413 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1414 | if (!nilfs_transaction_cachep) | |
1415 | goto fail; | |
1416 | ||
1417 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1418 | sizeof(struct nilfs_segment_buffer), 0, | |
1419 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1420 | if (!nilfs_segbuf_cachep) | |
1421 | goto fail; | |
1422 | ||
1423 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1424 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1425 | 0, 0, NULL); | |
1426 | if (!nilfs_btree_path_cache) | |
1427 | goto fail; | |
783f6184 RK |
1428 | |
1429 | return 0; | |
1430 | ||
41c88bd7 LH |
1431 | fail: |
1432 | nilfs_destroy_cachep(); | |
1433 | return -ENOMEM; | |
1434 | } | |
1435 | ||
1436 | static int __init init_nilfs_fs(void) | |
1437 | { | |
1438 | int err; | |
783f6184 | 1439 | |
41c88bd7 LH |
1440 | err = nilfs_init_cachep(); |
1441 | if (err) | |
1442 | goto fail; | |
783f6184 | 1443 | |
dd70edbd | 1444 | err = nilfs_sysfs_init(); |
41c88bd7 LH |
1445 | if (err) |
1446 | goto free_cachep; | |
783f6184 | 1447 | |
dd70edbd VD |
1448 | err = register_filesystem(&nilfs_fs_type); |
1449 | if (err) | |
1450 | goto deinit_sysfs_entry; | |
1451 | ||
9f130263 | 1452 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1453 | return 0; |
783f6184 | 1454 | |
dd70edbd VD |
1455 | deinit_sysfs_entry: |
1456 | nilfs_sysfs_exit(); | |
41c88bd7 LH |
1457 | free_cachep: |
1458 | nilfs_destroy_cachep(); | |
1459 | fail: | |
783f6184 RK |
1460 | return err; |
1461 | } | |
1462 | ||
1463 | static void __exit exit_nilfs_fs(void) | |
1464 | { | |
41c88bd7 | 1465 | nilfs_destroy_cachep(); |
dd70edbd | 1466 | nilfs_sysfs_exit(); |
783f6184 RK |
1467 | unregister_filesystem(&nilfs_fs_type); |
1468 | } | |
1469 | ||
1470 | module_init(init_nilfs_fs) | |
1471 | module_exit(exit_nilfs_fs) |