Commit | Line | Data |
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ae98043f | 1 | // SPDX-License-Identifier: GPL-2.0+ |
783f6184 | 2 | /* |
94ee1d91 | 3 | * NILFS module and super block management. |
783f6184 RK |
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 | |
2987a4cf | 65 | void __nilfs_msg(struct super_block *sb, const char *fmt, ...) |
a66dfb0a RK |
66 | { |
67 | struct va_format vaf; | |
68 | va_list args; | |
2987a4cf | 69 | int level; |
a66dfb0a RK |
70 | |
71 | va_start(args, fmt); | |
2987a4cf JP |
72 | |
73 | level = printk_get_level(fmt); | |
74 | vaf.fmt = printk_skip_level(fmt); | |
a66dfb0a | 75 | vaf.va = &args; |
2987a4cf | 76 | |
a66dfb0a | 77 | if (sb) |
2987a4cf JP |
78 | printk("%c%cNILFS (%s): %pV\n", |
79 | KERN_SOH_ASCII, level, sb->s_id, &vaf); | |
a66dfb0a | 80 | else |
2987a4cf JP |
81 | printk("%c%cNILFS: %pV\n", |
82 | KERN_SOH_ASCII, level, &vaf); | |
83 | ||
a66dfb0a RK |
84 | va_end(args); |
85 | } | |
86 | ||
f7545144 | 87 | static void nilfs_set_error(struct super_block *sb) |
c8a11c8a | 88 | { |
e3154e97 | 89 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 90 | struct nilfs_super_block **sbp; |
c8a11c8a RK |
91 | |
92 | down_write(&nilfs->ns_sem); | |
93 | if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { | |
94 | nilfs->ns_mount_state |= NILFS_ERROR_FS; | |
f7545144 | 95 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 JS |
96 | if (likely(sbp)) { |
97 | sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
b2ac86e1 JS |
98 | if (sbp[1]) |
99 | sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS); | |
f7545144 | 100 | nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); |
d26493b6 | 101 | } |
c8a11c8a RK |
102 | } |
103 | up_write(&nilfs->ns_sem); | |
104 | } | |
105 | ||
783f6184 | 106 | /** |
cae3d4ca | 107 | * __nilfs_error() - report failure condition on a filesystem |
783f6184 | 108 | * |
cae3d4ca RK |
109 | * __nilfs_error() sets an ERROR_FS flag on the superblock as well as |
110 | * reporting an error message. This function should be called when | |
111 | * NILFS detects incoherences or defects of meta data on disk. | |
783f6184 | 112 | * |
cae3d4ca RK |
113 | * This implements the body of nilfs_error() macro. Normally, |
114 | * nilfs_error() should be used. As for sustainable errors such as a | |
a1d0747a | 115 | * single-shot I/O error, nilfs_err() should be used instead. |
cae3d4ca RK |
116 | * |
117 | * Callers should not add a trailing newline since this will do it. | |
783f6184 | 118 | */ |
cae3d4ca RK |
119 | void __nilfs_error(struct super_block *sb, const char *function, |
120 | const char *fmt, ...) | |
783f6184 | 121 | { |
e3154e97 | 122 | struct the_nilfs *nilfs = sb->s_fs_info; |
b004a5eb | 123 | struct va_format vaf; |
783f6184 RK |
124 | va_list args; |
125 | ||
126 | va_start(args, fmt); | |
b004a5eb JP |
127 | |
128 | vaf.fmt = fmt; | |
129 | vaf.va = &args; | |
130 | ||
131 | printk(KERN_CRIT "NILFS error (device %s): %s: %pV\n", | |
132 | sb->s_id, function, &vaf); | |
133 | ||
783f6184 RK |
134 | va_end(args); |
135 | ||
bc98a42c | 136 | if (!sb_rdonly(sb)) { |
f7545144 | 137 | nilfs_set_error(sb); |
783f6184 | 138 | |
3b2ce58b | 139 | if (nilfs_test_opt(nilfs, ERRORS_RO)) { |
783f6184 | 140 | printk(KERN_CRIT "Remounting filesystem read-only\n"); |
1751e8a6 | 141 | sb->s_flags |= SB_RDONLY; |
783f6184 RK |
142 | } |
143 | } | |
144 | ||
3b2ce58b | 145 | if (nilfs_test_opt(nilfs, ERRORS_PANIC)) |
783f6184 RK |
146 | panic("NILFS (device %s): panic forced after error\n", |
147 | sb->s_id); | |
148 | } | |
149 | ||
2879ed66 | 150 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
783f6184 RK |
151 | { |
152 | struct nilfs_inode_info *ii; | |
153 | ||
fd60b288 | 154 | ii = alloc_inode_sb(sb, nilfs_inode_cachep, GFP_NOFS); |
783f6184 RK |
155 | if (!ii) |
156 | return NULL; | |
157 | ii->i_bh = NULL; | |
158 | ii->i_state = 0; | |
0e14a359 | 159 | ii->i_cno = 0; |
e897be17 RK |
160 | ii->i_assoc_inode = NULL; |
161 | ii->i_bmap = &ii->i_bmap_data; | |
783f6184 RK |
162 | return &ii->vfs_inode; |
163 | } | |
164 | ||
977c3d18 | 165 | static void nilfs_free_inode(struct inode *inode) |
783f6184 | 166 | { |
2d19961d RK |
167 | if (nilfs_is_metadata_file_inode(inode)) |
168 | nilfs_mdt_destroy(inode); | |
169 | ||
783f6184 RK |
170 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
171 | } | |
172 | ||
f7545144 | 173 | static int nilfs_sync_super(struct super_block *sb, int flag) |
783f6184 | 174 | { |
e3154e97 | 175 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 176 | int err; |
783f6184 | 177 | |
783f6184 | 178 | retry: |
e339ad31 | 179 | set_buffer_dirty(nilfs->ns_sbh[0]); |
3b2ce58b | 180 | if (nilfs_test_opt(nilfs, BARRIER)) { |
87e99511 | 181 | err = __sync_dirty_buffer(nilfs->ns_sbh[0], |
70fd7614 | 182 | REQ_SYNC | REQ_PREFLUSH | REQ_FUA); |
87e99511 CH |
183 | } else { |
184 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); | |
783f6184 | 185 | } |
87e99511 | 186 | |
e339ad31 | 187 | if (unlikely(err)) { |
a1d0747a | 188 | nilfs_err(sb, "unable to write superblock: err=%d", err); |
e339ad31 | 189 | if (err == -EIO && nilfs->ns_sbh[1]) { |
b2ac86e1 JS |
190 | /* |
191 | * sbp[0] points to newer log than sbp[1], | |
192 | * so copy sbp[0] to sbp[1] to take over sbp[0]. | |
193 | */ | |
194 | memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0], | |
195 | nilfs->ns_sbsize); | |
e339ad31 RK |
196 | nilfs_fall_back_super_block(nilfs); |
197 | goto retry; | |
198 | } | |
199 | } else { | |
200 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; | |
201 | ||
b2ac86e1 JS |
202 | nilfs->ns_sbwcount++; |
203 | ||
e339ad31 RK |
204 | /* |
205 | * The latest segment becomes trailable from the position | |
206 | * written in superblock. | |
207 | */ | |
783f6184 | 208 | clear_nilfs_discontinued(nilfs); |
e339ad31 RK |
209 | |
210 | /* update GC protection for recent segments */ | |
211 | if (nilfs->ns_sbh[1]) { | |
b2ac86e1 | 212 | if (flag == NILFS_SB_COMMIT_ALL) { |
e339ad31 | 213 | set_buffer_dirty(nilfs->ns_sbh[1]); |
b2ac86e1 JS |
214 | if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0) |
215 | goto out; | |
e339ad31 | 216 | } |
b2ac86e1 JS |
217 | if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) < |
218 | le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno)) | |
219 | sbp = nilfs->ns_sbp[1]; | |
e339ad31 | 220 | } |
783f6184 | 221 | |
b2ac86e1 JS |
222 | spin_lock(&nilfs->ns_last_segment_lock); |
223 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); | |
224 | spin_unlock(&nilfs->ns_last_segment_lock); | |
225 | } | |
226 | out: | |
783f6184 RK |
227 | return err; |
228 | } | |
229 | ||
60f46b7e RK |
230 | void nilfs_set_log_cursor(struct nilfs_super_block *sbp, |
231 | struct the_nilfs *nilfs) | |
232 | { | |
233 | sector_t nfreeblocks; | |
234 | ||
235 | /* nilfs->ns_sem must be locked by the caller. */ | |
236 | nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
237 | sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); | |
238 | ||
239 | spin_lock(&nilfs->ns_last_segment_lock); | |
240 | sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); | |
241 | sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); | |
242 | sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); | |
243 | spin_unlock(&nilfs->ns_last_segment_lock); | |
244 | } | |
245 | ||
f7545144 | 246 | struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb, |
b2ac86e1 | 247 | int flip) |
783f6184 | 248 | { |
e3154e97 | 249 | struct the_nilfs *nilfs = sb->s_fs_info; |
e339ad31 | 250 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
783f6184 | 251 | |
d26493b6 | 252 | /* nilfs->ns_sem must be locked by the caller. */ |
34cb9b5c | 253 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
d26493b6 JS |
254 | if (sbp[1] && |
255 | sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
b2ac86e1 | 256 | memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); |
d26493b6 | 257 | } else { |
a1d0747a | 258 | nilfs_crit(sb, "superblock broke"); |
d26493b6 | 259 | return NULL; |
e339ad31 | 260 | } |
b2ac86e1 JS |
261 | } else if (sbp[1] && |
262 | sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { | |
7592ecde | 263 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); |
e339ad31 | 264 | } |
b2ac86e1 JS |
265 | |
266 | if (flip && sbp[1]) | |
267 | nilfs_swap_super_block(nilfs); | |
268 | ||
d26493b6 JS |
269 | return sbp; |
270 | } | |
271 | ||
f7545144 | 272 | int nilfs_commit_super(struct super_block *sb, int flag) |
d26493b6 | 273 | { |
e3154e97 | 274 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 275 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
fb04b91b | 276 | time64_t t; |
d26493b6 JS |
277 | |
278 | /* nilfs->ns_sem must be locked by the caller. */ | |
fb04b91b | 279 | t = ktime_get_real_seconds(); |
b2ac86e1 | 280 | nilfs->ns_sbwtime = t; |
e339ad31 RK |
281 | sbp[0]->s_wtime = cpu_to_le64(t); |
282 | sbp[0]->s_sum = 0; | |
283 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
284 | (unsigned char *)sbp[0], | |
285 | nilfs->ns_sbsize)); | |
b2ac86e1 JS |
286 | if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) { |
287 | sbp[1]->s_wtime = sbp[0]->s_wtime; | |
288 | sbp[1]->s_sum = 0; | |
289 | sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, | |
290 | (unsigned char *)sbp[1], | |
291 | nilfs->ns_sbsize)); | |
e339ad31 | 292 | } |
e605f0a7 | 293 | clear_nilfs_sb_dirty(nilfs); |
e2c7617a AR |
294 | nilfs->ns_flushed_device = 1; |
295 | /* make sure store to ns_flushed_device cannot be reordered */ | |
296 | smp_wmb(); | |
f7545144 | 297 | return nilfs_sync_super(sb, flag); |
783f6184 RK |
298 | } |
299 | ||
7ecaa46c RK |
300 | /** |
301 | * nilfs_cleanup_super() - write filesystem state for cleanup | |
f7545144 | 302 | * @sb: super block instance to be unmounted or degraded to read-only |
7ecaa46c RK |
303 | * |
304 | * This function restores state flags in the on-disk super block. | |
305 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the | |
306 | * filesystem was not clean previously. | |
307 | */ | |
f7545144 | 308 | int nilfs_cleanup_super(struct super_block *sb) |
7ecaa46c | 309 | { |
e3154e97 | 310 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 311 | struct nilfs_super_block **sbp; |
b2ac86e1 | 312 | int flag = NILFS_SB_COMMIT; |
d26493b6 | 313 | int ret = -EIO; |
7ecaa46c | 314 | |
f7545144 | 315 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 | 316 | if (sbp) { |
f7545144 RK |
317 | sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state); |
318 | nilfs_set_log_cursor(sbp[0], nilfs); | |
b2ac86e1 JS |
319 | if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { |
320 | /* | |
321 | * make the "clean" flag also to the opposite | |
322 | * super block if both super blocks point to | |
323 | * the same checkpoint. | |
324 | */ | |
325 | sbp[1]->s_state = sbp[0]->s_state; | |
326 | flag = NILFS_SB_COMMIT_ALL; | |
327 | } | |
f7545144 | 328 | ret = nilfs_commit_super(sb, flag); |
d26493b6 | 329 | } |
7ecaa46c RK |
330 | return ret; |
331 | } | |
332 | ||
cfb0a4bf RK |
333 | /** |
334 | * nilfs_move_2nd_super - relocate secondary super block | |
335 | * @sb: super block instance | |
336 | * @sb2off: new offset of the secondary super block (in bytes) | |
337 | */ | |
338 | static int nilfs_move_2nd_super(struct super_block *sb, loff_t sb2off) | |
339 | { | |
340 | struct the_nilfs *nilfs = sb->s_fs_info; | |
341 | struct buffer_head *nsbh; | |
342 | struct nilfs_super_block *nsbp; | |
343 | sector_t blocknr, newblocknr; | |
344 | unsigned long offset; | |
4f05028f | 345 | int sb2i; /* array index of the secondary superblock */ |
cfb0a4bf RK |
346 | int ret = 0; |
347 | ||
348 | /* nilfs->ns_sem must be locked by the caller. */ | |
349 | if (nilfs->ns_sbh[1] && | |
350 | nilfs->ns_sbh[1]->b_blocknr > nilfs->ns_first_data_block) { | |
351 | sb2i = 1; | |
352 | blocknr = nilfs->ns_sbh[1]->b_blocknr; | |
353 | } else if (nilfs->ns_sbh[0]->b_blocknr > nilfs->ns_first_data_block) { | |
354 | sb2i = 0; | |
355 | blocknr = nilfs->ns_sbh[0]->b_blocknr; | |
4f05028f RK |
356 | } else { |
357 | sb2i = -1; | |
358 | blocknr = 0; | |
cfb0a4bf RK |
359 | } |
360 | if (sb2i >= 0 && (u64)blocknr << nilfs->ns_blocksize_bits == sb2off) | |
361 | goto out; /* super block location is unchanged */ | |
362 | ||
363 | /* Get new super block buffer */ | |
364 | newblocknr = sb2off >> nilfs->ns_blocksize_bits; | |
365 | offset = sb2off & (nilfs->ns_blocksize - 1); | |
366 | nsbh = sb_getblk(sb, newblocknr); | |
367 | if (!nsbh) { | |
a1d0747a JP |
368 | nilfs_warn(sb, |
369 | "unable to move secondary superblock to block %llu", | |
370 | (unsigned long long)newblocknr); | |
cfb0a4bf RK |
371 | ret = -EIO; |
372 | goto out; | |
373 | } | |
374 | nsbp = (void *)nsbh->b_data + offset; | |
375 | memset(nsbp, 0, nilfs->ns_blocksize); | |
376 | ||
377 | if (sb2i >= 0) { | |
378 | memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize); | |
379 | brelse(nilfs->ns_sbh[sb2i]); | |
380 | nilfs->ns_sbh[sb2i] = nsbh; | |
381 | nilfs->ns_sbp[sb2i] = nsbp; | |
382 | } else if (nilfs->ns_sbh[0]->b_blocknr < nilfs->ns_first_data_block) { | |
383 | /* secondary super block will be restored to index 1 */ | |
384 | nilfs->ns_sbh[1] = nsbh; | |
385 | nilfs->ns_sbp[1] = nsbp; | |
386 | } else { | |
387 | brelse(nsbh); | |
388 | } | |
389 | out: | |
390 | return ret; | |
391 | } | |
392 | ||
4e33f9ea RK |
393 | /** |
394 | * nilfs_resize_fs - resize the filesystem | |
395 | * @sb: super block instance | |
396 | * @newsize: new size of the filesystem (in bytes) | |
397 | */ | |
398 | int nilfs_resize_fs(struct super_block *sb, __u64 newsize) | |
399 | { | |
400 | struct the_nilfs *nilfs = sb->s_fs_info; | |
401 | struct nilfs_super_block **sbp; | |
402 | __u64 devsize, newnsegs; | |
403 | loff_t sb2off; | |
404 | int ret; | |
405 | ||
406 | ret = -ERANGE; | |
4fcd6979 | 407 | devsize = bdev_nr_bytes(sb->s_bdev); |
4e33f9ea RK |
408 | if (newsize > devsize) |
409 | goto out; | |
410 | ||
99b9402a RK |
411 | /* |
412 | * Prevent underflow in second superblock position calculation. | |
413 | * The exact minimum size check is done in nilfs_sufile_resize(). | |
414 | */ | |
415 | if (newsize < 4096) { | |
416 | ret = -ENOSPC; | |
417 | goto out; | |
418 | } | |
419 | ||
4e33f9ea RK |
420 | /* |
421 | * Write lock is required to protect some functions depending | |
422 | * on the number of segments, the number of reserved segments, | |
423 | * and so forth. | |
424 | */ | |
425 | down_write(&nilfs->ns_segctor_sem); | |
426 | ||
427 | sb2off = NILFS_SB2_OFFSET_BYTES(newsize); | |
428 | newnsegs = sb2off >> nilfs->ns_blocksize_bits; | |
429 | do_div(newnsegs, nilfs->ns_blocks_per_segment); | |
430 | ||
431 | ret = nilfs_sufile_resize(nilfs->ns_sufile, newnsegs); | |
432 | up_write(&nilfs->ns_segctor_sem); | |
433 | if (ret < 0) | |
434 | goto out; | |
435 | ||
436 | ret = nilfs_construct_segment(sb); | |
437 | if (ret < 0) | |
438 | goto out; | |
439 | ||
440 | down_write(&nilfs->ns_sem); | |
441 | nilfs_move_2nd_super(sb, sb2off); | |
442 | ret = -EIO; | |
443 | sbp = nilfs_prepare_super(sb, 0); | |
444 | if (likely(sbp)) { | |
445 | nilfs_set_log_cursor(sbp[0], nilfs); | |
446 | /* | |
447 | * Drop NILFS_RESIZE_FS flag for compatibility with | |
448 | * mount-time resize which may be implemented in a | |
449 | * future release. | |
450 | */ | |
451 | sbp[0]->s_state = cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & | |
452 | ~NILFS_RESIZE_FS); | |
453 | sbp[0]->s_dev_size = cpu_to_le64(newsize); | |
454 | sbp[0]->s_nsegments = cpu_to_le64(nilfs->ns_nsegments); | |
455 | if (sbp[1]) | |
456 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
457 | ret = nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); | |
458 | } | |
459 | up_write(&nilfs->ns_sem); | |
460 | ||
461 | /* | |
462 | * Reset the range of allocatable segments last. This order | |
463 | * is important in the case of expansion because the secondary | |
464 | * superblock must be protected from log write until migration | |
465 | * completes. | |
466 | */ | |
467 | if (!ret) | |
468 | nilfs_sufile_set_alloc_range(nilfs->ns_sufile, 0, newnsegs - 1); | |
469 | out: | |
470 | return ret; | |
471 | } | |
472 | ||
783f6184 RK |
473 | static void nilfs_put_super(struct super_block *sb) |
474 | { | |
e3154e97 | 475 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 476 | |
f7545144 | 477 | nilfs_detach_log_writer(sb); |
783f6184 | 478 | |
bc98a42c | 479 | if (!sb_rdonly(sb)) { |
783f6184 | 480 | down_write(&nilfs->ns_sem); |
f7545144 | 481 | nilfs_cleanup_super(sb); |
783f6184 RK |
482 | up_write(&nilfs->ns_sem); |
483 | } | |
484 | ||
42560f9c | 485 | nilfs_sysfs_delete_device_group(nilfs); |
f1e89c86 RK |
486 | iput(nilfs->ns_sufile); |
487 | iput(nilfs->ns_cpfile); | |
488 | iput(nilfs->ns_dat); | |
489 | ||
348fe8da | 490 | destroy_nilfs(nilfs); |
783f6184 | 491 | sb->s_fs_info = NULL; |
783f6184 RK |
492 | } |
493 | ||
783f6184 RK |
494 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
495 | { | |
e3154e97 | 496 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 | 497 | struct nilfs_super_block **sbp; |
783f6184 RK |
498 | int err = 0; |
499 | ||
500 | /* This function is called when super block should be written back */ | |
501 | if (wait) | |
502 | err = nilfs_construct_segment(sb); | |
6233caa9 JS |
503 | |
504 | down_write(&nilfs->ns_sem); | |
d26493b6 | 505 | if (nilfs_sb_dirty(nilfs)) { |
f7545144 | 506 | sbp = nilfs_prepare_super(sb, nilfs_sb_will_flip(nilfs)); |
b2ac86e1 JS |
507 | if (likely(sbp)) { |
508 | nilfs_set_log_cursor(sbp[0], nilfs); | |
f7545144 | 509 | nilfs_commit_super(sb, NILFS_SB_COMMIT); |
b2ac86e1 | 510 | } |
d26493b6 | 511 | } |
6233caa9 JS |
512 | up_write(&nilfs->ns_sem); |
513 | ||
e2c7617a AR |
514 | if (!err) |
515 | err = nilfs_flush_device(nilfs); | |
516 | ||
783f6184 RK |
517 | return err; |
518 | } | |
519 | ||
f7545144 | 520 | int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt, |
4d8d9293 | 521 | struct nilfs_root **rootp) |
783f6184 | 522 | { |
e3154e97 | 523 | struct the_nilfs *nilfs = sb->s_fs_info; |
4d8d9293 | 524 | struct nilfs_root *root; |
783f6184 RK |
525 | struct nilfs_checkpoint *raw_cp; |
526 | struct buffer_head *bh_cp; | |
4d8d9293 | 527 | int err = -ENOMEM; |
783f6184 | 528 | |
4d8d9293 RK |
529 | root = nilfs_find_or_create_root( |
530 | nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); | |
531 | if (!root) | |
532 | return err; | |
783f6184 | 533 | |
e912a5b6 RK |
534 | if (root->ifile) |
535 | goto reuse; /* already attached checkpoint */ | |
783f6184 | 536 | |
1154ecbd | 537 | down_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
538 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
539 | &bh_cp); | |
1154ecbd | 540 | up_read(&nilfs->ns_segctor_sem); |
783f6184 RK |
541 | if (unlikely(err)) { |
542 | if (err == -ENOENT || err == -EINVAL) { | |
a1d0747a | 543 | nilfs_err(sb, |
feee880f RK |
544 | "Invalid checkpoint (checkpoint number=%llu)", |
545 | (unsigned long long)cno); | |
783f6184 RK |
546 | err = -EINVAL; |
547 | } | |
548 | goto failed; | |
549 | } | |
f1e89c86 | 550 | |
f7545144 | 551 | err = nilfs_ifile_read(sb, root, nilfs->ns_inode_size, |
f1e89c86 RK |
552 | &raw_cp->cp_ifile_inode, &root->ifile); |
553 | if (err) | |
783f6184 | 554 | goto failed_bh; |
b7c06342 | 555 | |
e5f7f848 VD |
556 | atomic64_set(&root->inodes_count, |
557 | le64_to_cpu(raw_cp->cp_inodes_count)); | |
558 | atomic64_set(&root->blocks_count, | |
559 | le64_to_cpu(raw_cp->cp_blocks_count)); | |
783f6184 RK |
560 | |
561 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
4d8d9293 | 562 | |
e912a5b6 | 563 | reuse: |
4d8d9293 | 564 | *rootp = root; |
783f6184 RK |
565 | return 0; |
566 | ||
567 | failed_bh: | |
568 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); | |
569 | failed: | |
4d8d9293 | 570 | nilfs_put_root(root); |
783f6184 RK |
571 | |
572 | return err; | |
573 | } | |
783f6184 | 574 | |
5beb6e0b RK |
575 | static int nilfs_freeze(struct super_block *sb) |
576 | { | |
e3154e97 | 577 | struct the_nilfs *nilfs = sb->s_fs_info; |
5beb6e0b RK |
578 | int err; |
579 | ||
bc98a42c | 580 | if (sb_rdonly(sb)) |
5beb6e0b | 581 | return 0; |
783f6184 | 582 | |
5beb6e0b RK |
583 | /* Mark super block clean */ |
584 | down_write(&nilfs->ns_sem); | |
f7545144 | 585 | err = nilfs_cleanup_super(sb); |
5beb6e0b | 586 | up_write(&nilfs->ns_sem); |
783f6184 RK |
587 | return err; |
588 | } | |
589 | ||
5beb6e0b | 590 | static int nilfs_unfreeze(struct super_block *sb) |
783f6184 | 591 | { |
e3154e97 | 592 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 593 | |
bc98a42c | 594 | if (sb_rdonly(sb)) |
5beb6e0b RK |
595 | return 0; |
596 | ||
597 | down_write(&nilfs->ns_sem); | |
f7545144 | 598 | nilfs_setup_super(sb, false); |
5beb6e0b RK |
599 | up_write(&nilfs->ns_sem); |
600 | return 0; | |
783f6184 RK |
601 | } |
602 | ||
783f6184 RK |
603 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
604 | { | |
605 | struct super_block *sb = dentry->d_sb; | |
2b0143b5 | 606 | struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root; |
b7c06342 | 607 | struct the_nilfs *nilfs = root->nilfs; |
c306af23 | 608 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
783f6184 RK |
609 | unsigned long long blocks; |
610 | unsigned long overhead; | |
611 | unsigned long nrsvblocks; | |
612 | sector_t nfreeblocks; | |
c7ef972c | 613 | u64 nmaxinodes, nfreeinodes; |
783f6184 RK |
614 | int err; |
615 | ||
616 | /* | |
617 | * Compute all of the segment blocks | |
618 | * | |
619 | * The blocks before first segment and after last segment | |
620 | * are excluded. | |
621 | */ | |
622 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments | |
623 | - nilfs->ns_first_data_block; | |
624 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; | |
625 | ||
626 | /* | |
627 | * Compute the overhead | |
628 | * | |
7a65004b | 629 | * When distributing meta data blocks outside segment structure, |
783f6184 RK |
630 | * We must count them as the overhead. |
631 | */ | |
632 | overhead = 0; | |
633 | ||
634 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); | |
635 | if (unlikely(err)) | |
636 | return err; | |
637 | ||
c7ef972c VD |
638 | err = nilfs_ifile_count_free_inodes(root->ifile, |
639 | &nmaxinodes, &nfreeinodes); | |
640 | if (unlikely(err)) { | |
a1d0747a | 641 | nilfs_warn(sb, "failed to count free inodes: err=%d", err); |
c7ef972c VD |
642 | if (err == -ERANGE) { |
643 | /* | |
644 | * If nilfs_palloc_count_max_entries() returns | |
645 | * -ERANGE error code then we simply treat | |
646 | * curent inodes count as maximum possible and | |
647 | * zero as free inodes value. | |
648 | */ | |
e5f7f848 | 649 | nmaxinodes = atomic64_read(&root->inodes_count); |
c7ef972c VD |
650 | nfreeinodes = 0; |
651 | err = 0; | |
652 | } else | |
653 | return err; | |
654 | } | |
655 | ||
783f6184 RK |
656 | buf->f_type = NILFS_SUPER_MAGIC; |
657 | buf->f_bsize = sb->s_blocksize; | |
658 | buf->f_blocks = blocks - overhead; | |
659 | buf->f_bfree = nfreeblocks; | |
660 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? | |
661 | (buf->f_bfree - nrsvblocks) : 0; | |
c7ef972c VD |
662 | buf->f_files = nmaxinodes; |
663 | buf->f_ffree = nfreeinodes; | |
783f6184 | 664 | buf->f_namelen = NILFS_NAME_LEN; |
6d1349c7 | 665 | buf->f_fsid = u64_to_fsid(id); |
c306af23 | 666 | |
783f6184 RK |
667 | return 0; |
668 | } | |
669 | ||
34c80b1d | 670 | static int nilfs_show_options(struct seq_file *seq, struct dentry *dentry) |
b58a285b | 671 | { |
34c80b1d | 672 | struct super_block *sb = dentry->d_sb; |
e3154e97 | 673 | struct the_nilfs *nilfs = sb->s_fs_info; |
2b0143b5 | 674 | struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root; |
b58a285b | 675 | |
3b2ce58b | 676 | if (!nilfs_test_opt(nilfs, BARRIER)) |
c6b4d57d | 677 | seq_puts(seq, ",nobarrier"); |
f11459ad RK |
678 | if (root->cno != NILFS_CPTREE_CURRENT_CNO) |
679 | seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno); | |
3b2ce58b | 680 | if (nilfs_test_opt(nilfs, ERRORS_PANIC)) |
c6b4d57d | 681 | seq_puts(seq, ",errors=panic"); |
3b2ce58b | 682 | if (nilfs_test_opt(nilfs, ERRORS_CONT)) |
c6b4d57d | 683 | seq_puts(seq, ",errors=continue"); |
3b2ce58b | 684 | if (nilfs_test_opt(nilfs, STRICT_ORDER)) |
c6b4d57d | 685 | seq_puts(seq, ",order=strict"); |
3b2ce58b | 686 | if (nilfs_test_opt(nilfs, NORECOVERY)) |
c6b4d57d | 687 | seq_puts(seq, ",norecovery"); |
3b2ce58b | 688 | if (nilfs_test_opt(nilfs, DISCARD)) |
c6b4d57d | 689 | seq_puts(seq, ",discard"); |
b58a285b JS |
690 | |
691 | return 0; | |
692 | } | |
693 | ||
b87221de | 694 | static const struct super_operations nilfs_sops = { |
783f6184 | 695 | .alloc_inode = nilfs_alloc_inode, |
977c3d18 | 696 | .free_inode = nilfs_free_inode, |
783f6184 | 697 | .dirty_inode = nilfs_dirty_inode, |
6fd1e5c9 | 698 | .evict_inode = nilfs_evict_inode, |
783f6184 | 699 | .put_super = nilfs_put_super, |
783f6184 | 700 | .sync_fs = nilfs_sync_fs, |
5beb6e0b RK |
701 | .freeze_fs = nilfs_freeze, |
702 | .unfreeze_fs = nilfs_unfreeze, | |
783f6184 RK |
703 | .statfs = nilfs_statfs, |
704 | .remount_fs = nilfs_remount, | |
b58a285b | 705 | .show_options = nilfs_show_options |
783f6184 RK |
706 | }; |
707 | ||
783f6184 RK |
708 | enum { |
709 | Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
773bc4f3 | 710 | Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
802d3177 | 711 | Opt_discard, Opt_nodiscard, Opt_err, |
783f6184 RK |
712 | }; |
713 | ||
714 | static match_table_t tokens = { | |
715 | {Opt_err_cont, "errors=continue"}, | |
716 | {Opt_err_panic, "errors=panic"}, | |
717 | {Opt_err_ro, "errors=remount-ro"}, | |
773bc4f3 | 718 | {Opt_barrier, "barrier"}, |
91f1953b | 719 | {Opt_nobarrier, "nobarrier"}, |
783f6184 RK |
720 | {Opt_snapshot, "cp=%u"}, |
721 | {Opt_order, "order=%s"}, | |
0234576d | 722 | {Opt_norecovery, "norecovery"}, |
e902ec99 | 723 | {Opt_discard, "discard"}, |
802d3177 | 724 | {Opt_nodiscard, "nodiscard"}, |
783f6184 RK |
725 | {Opt_err, NULL} |
726 | }; | |
727 | ||
7c017457 | 728 | static int parse_options(char *options, struct super_block *sb, int is_remount) |
783f6184 | 729 | { |
e3154e97 | 730 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 RK |
731 | char *p; |
732 | substring_t args[MAX_OPT_ARGS]; | |
783f6184 RK |
733 | |
734 | if (!options) | |
735 | return 1; | |
736 | ||
737 | while ((p = strsep(&options, ",")) != NULL) { | |
738 | int token; | |
4ad364ca | 739 | |
783f6184 RK |
740 | if (!*p) |
741 | continue; | |
742 | ||
743 | token = match_token(p, tokens, args); | |
744 | switch (token) { | |
773bc4f3 | 745 | case Opt_barrier: |
3b2ce58b | 746 | nilfs_set_opt(nilfs, BARRIER); |
773bc4f3 | 747 | break; |
91f1953b | 748 | case Opt_nobarrier: |
3b2ce58b | 749 | nilfs_clear_opt(nilfs, BARRIER); |
783f6184 RK |
750 | break; |
751 | case Opt_order: | |
752 | if (strcmp(args[0].from, "relaxed") == 0) | |
753 | /* Ordered data semantics */ | |
3b2ce58b | 754 | nilfs_clear_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
755 | else if (strcmp(args[0].from, "strict") == 0) |
756 | /* Strict in-order semantics */ | |
3b2ce58b | 757 | nilfs_set_opt(nilfs, STRICT_ORDER); |
783f6184 RK |
758 | else |
759 | return 0; | |
760 | break; | |
761 | case Opt_err_panic: | |
3b2ce58b | 762 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC); |
783f6184 RK |
763 | break; |
764 | case Opt_err_ro: | |
3b2ce58b | 765 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO); |
783f6184 RK |
766 | break; |
767 | case Opt_err_cont: | |
3b2ce58b | 768 | nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT); |
783f6184 RK |
769 | break; |
770 | case Opt_snapshot: | |
7c017457 | 771 | if (is_remount) { |
a1d0747a | 772 | nilfs_err(sb, |
feee880f RK |
773 | "\"%s\" option is invalid for remount", |
774 | p); | |
783f6184 | 775 | return 0; |
7c017457 | 776 | } |
783f6184 | 777 | break; |
0234576d | 778 | case Opt_norecovery: |
3b2ce58b | 779 | nilfs_set_opt(nilfs, NORECOVERY); |
0234576d | 780 | break; |
e902ec99 | 781 | case Opt_discard: |
3b2ce58b | 782 | nilfs_set_opt(nilfs, DISCARD); |
e902ec99 | 783 | break; |
802d3177 | 784 | case Opt_nodiscard: |
3b2ce58b | 785 | nilfs_clear_opt(nilfs, DISCARD); |
802d3177 | 786 | break; |
783f6184 | 787 | default: |
a1d0747a | 788 | nilfs_err(sb, "unrecognized mount option \"%s\"", p); |
783f6184 RK |
789 | return 0; |
790 | } | |
791 | } | |
792 | return 1; | |
793 | } | |
794 | ||
795 | static inline void | |
3b2ce58b | 796 | nilfs_set_default_options(struct super_block *sb, |
783f6184 RK |
797 | struct nilfs_super_block *sbp) |
798 | { | |
e3154e97 | 799 | struct the_nilfs *nilfs = sb->s_fs_info; |
3b2ce58b RK |
800 | |
801 | nilfs->ns_mount_opt = | |
277a6a34 | 802 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
783f6184 RK |
803 | } |
804 | ||
f7545144 | 805 | static int nilfs_setup_super(struct super_block *sb, int is_mount) |
783f6184 | 806 | { |
e3154e97 | 807 | struct the_nilfs *nilfs = sb->s_fs_info; |
d26493b6 JS |
808 | struct nilfs_super_block **sbp; |
809 | int max_mnt_count; | |
810 | int mnt_count; | |
811 | ||
812 | /* nilfs->ns_sem must be locked by the caller. */ | |
f7545144 | 813 | sbp = nilfs_prepare_super(sb, 0); |
d26493b6 JS |
814 | if (!sbp) |
815 | return -EIO; | |
816 | ||
5beb6e0b RK |
817 | if (!is_mount) |
818 | goto skip_mount_setup; | |
819 | ||
d26493b6 JS |
820 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); |
821 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); | |
783f6184 | 822 | |
f50a4c81 | 823 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
a1d0747a | 824 | nilfs_warn(sb, "mounting fs with errors"); |
783f6184 RK |
825 | #if 0 |
826 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { | |
a1d0747a | 827 | nilfs_warn(sb, "maximal mount count reached"); |
783f6184 RK |
828 | #endif |
829 | } | |
830 | if (!max_mnt_count) | |
d26493b6 | 831 | sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
783f6184 | 832 | |
d26493b6 | 833 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
21a1a52d | 834 | sbp[0]->s_mtime = cpu_to_le64(ktime_get_real_seconds()); |
5beb6e0b RK |
835 | |
836 | skip_mount_setup: | |
d26493b6 JS |
837 | sbp[0]->s_state = |
838 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); | |
b2ac86e1 | 839 | /* synchronize sbp[1] with sbp[0] */ |
0ca7a5b9 RK |
840 | if (sbp[1]) |
841 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); | |
f7545144 | 842 | return nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); |
783f6184 RK |
843 | } |
844 | ||
e339ad31 RK |
845 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
846 | u64 pos, int blocksize, | |
847 | struct buffer_head **pbh) | |
783f6184 | 848 | { |
e339ad31 RK |
849 | unsigned long long sb_index = pos; |
850 | unsigned long offset; | |
783f6184 | 851 | |
e339ad31 | 852 | offset = do_div(sb_index, blocksize); |
783f6184 | 853 | *pbh = sb_bread(sb, sb_index); |
e339ad31 | 854 | if (!*pbh) |
783f6184 | 855 | return NULL; |
783f6184 RK |
856 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
857 | } | |
858 | ||
783f6184 RK |
859 | int nilfs_store_magic_and_option(struct super_block *sb, |
860 | struct nilfs_super_block *sbp, | |
861 | char *data) | |
862 | { | |
e3154e97 | 863 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 864 | |
783f6184 RK |
865 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
866 | ||
867 | /* FS independent flags */ | |
868 | #ifdef NILFS_ATIME_DISABLE | |
1751e8a6 | 869 | sb->s_flags |= SB_NOATIME; |
783f6184 RK |
870 | #endif |
871 | ||
3b2ce58b | 872 | nilfs_set_default_options(sb, sbp); |
783f6184 | 873 | |
574e6c31 RK |
874 | nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid); |
875 | nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid); | |
876 | nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval); | |
877 | nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max); | |
783f6184 | 878 | |
c9cb9b5c | 879 | return !parse_options(data, sb, 0) ? -EINVAL : 0; |
783f6184 RK |
880 | } |
881 | ||
c5ca48aa RK |
882 | int nilfs_check_feature_compatibility(struct super_block *sb, |
883 | struct nilfs_super_block *sbp) | |
884 | { | |
885 | __u64 features; | |
886 | ||
887 | features = le64_to_cpu(sbp->s_feature_incompat) & | |
888 | ~NILFS_FEATURE_INCOMPAT_SUPP; | |
889 | if (features) { | |
a1d0747a | 890 | nilfs_err(sb, |
feee880f RK |
891 | "couldn't mount because of unsupported optional features (%llx)", |
892 | (unsigned long long)features); | |
c5ca48aa RK |
893 | return -EINVAL; |
894 | } | |
895 | features = le64_to_cpu(sbp->s_feature_compat_ro) & | |
896 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
bc98a42c | 897 | if (!sb_rdonly(sb) && features) { |
a1d0747a | 898 | nilfs_err(sb, |
feee880f RK |
899 | "couldn't mount RDWR because of unsupported optional features (%llx)", |
900 | (unsigned long long)features); | |
c5ca48aa RK |
901 | return -EINVAL; |
902 | } | |
903 | return 0; | |
904 | } | |
905 | ||
367ea334 RK |
906 | static int nilfs_get_root_dentry(struct super_block *sb, |
907 | struct nilfs_root *root, | |
908 | struct dentry **root_dentry) | |
909 | { | |
910 | struct inode *inode; | |
911 | struct dentry *dentry; | |
912 | int ret = 0; | |
913 | ||
914 | inode = nilfs_iget(sb, root, NILFS_ROOT_INO); | |
915 | if (IS_ERR(inode)) { | |
367ea334 | 916 | ret = PTR_ERR(inode); |
a1d0747a | 917 | nilfs_err(sb, "error %d getting root inode", ret); |
367ea334 RK |
918 | goto out; |
919 | } | |
920 | if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { | |
921 | iput(inode); | |
a1d0747a | 922 | nilfs_err(sb, "corrupt root inode"); |
367ea334 RK |
923 | ret = -EINVAL; |
924 | goto out; | |
925 | } | |
926 | ||
f11459ad RK |
927 | if (root->cno == NILFS_CPTREE_CURRENT_CNO) { |
928 | dentry = d_find_alias(inode); | |
929 | if (!dentry) { | |
48fde701 | 930 | dentry = d_make_root(inode); |
f11459ad | 931 | if (!dentry) { |
f11459ad RK |
932 | ret = -ENOMEM; |
933 | goto failed_dentry; | |
934 | } | |
935 | } else { | |
936 | iput(inode); | |
937 | } | |
938 | } else { | |
1a0a397e | 939 | dentry = d_obtain_root(inode); |
f11459ad RK |
940 | if (IS_ERR(dentry)) { |
941 | ret = PTR_ERR(dentry); | |
942 | goto failed_dentry; | |
943 | } | |
367ea334 RK |
944 | } |
945 | *root_dentry = dentry; | |
946 | out: | |
947 | return ret; | |
f11459ad RK |
948 | |
949 | failed_dentry: | |
a1d0747a | 950 | nilfs_err(sb, "error %d getting root dentry", ret); |
f11459ad | 951 | goto out; |
367ea334 RK |
952 | } |
953 | ||
ab4d8f7e RK |
954 | static int nilfs_attach_snapshot(struct super_block *s, __u64 cno, |
955 | struct dentry **root_dentry) | |
956 | { | |
e3154e97 | 957 | struct the_nilfs *nilfs = s->s_fs_info; |
ab4d8f7e RK |
958 | struct nilfs_root *root; |
959 | int ret; | |
960 | ||
572d8b39 RK |
961 | mutex_lock(&nilfs->ns_snapshot_mount_mutex); |
962 | ||
ab4d8f7e RK |
963 | down_read(&nilfs->ns_segctor_sem); |
964 | ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno); | |
965 | up_read(&nilfs->ns_segctor_sem); | |
966 | if (ret < 0) { | |
967 | ret = (ret == -ENOENT) ? -EINVAL : ret; | |
968 | goto out; | |
969 | } else if (!ret) { | |
a1d0747a | 970 | nilfs_err(s, |
feee880f RK |
971 | "The specified checkpoint is not a snapshot (checkpoint number=%llu)", |
972 | (unsigned long long)cno); | |
ab4d8f7e RK |
973 | ret = -EINVAL; |
974 | goto out; | |
975 | } | |
976 | ||
f7545144 | 977 | ret = nilfs_attach_checkpoint(s, cno, false, &root); |
ab4d8f7e | 978 | if (ret) { |
a1d0747a | 979 | nilfs_err(s, |
feee880f RK |
980 | "error %d while loading snapshot (checkpoint number=%llu)", |
981 | ret, (unsigned long long)cno); | |
ab4d8f7e RK |
982 | goto out; |
983 | } | |
984 | ret = nilfs_get_root_dentry(s, root, root_dentry); | |
985 | nilfs_put_root(root); | |
986 | out: | |
572d8b39 | 987 | mutex_unlock(&nilfs->ns_snapshot_mount_mutex); |
ab4d8f7e RK |
988 | return ret; |
989 | } | |
990 | ||
f11459ad | 991 | /** |
e95c311e | 992 | * nilfs_tree_is_busy() - try to shrink dentries of a checkpoint |
f11459ad RK |
993 | * @root_dentry: root dentry of the tree to be shrunk |
994 | * | |
995 | * This function returns true if the tree was in-use. | |
996 | */ | |
e95c311e | 997 | static bool nilfs_tree_is_busy(struct dentry *root_dentry) |
f11459ad | 998 | { |
f11459ad | 999 | shrink_dcache_parent(root_dentry); |
e95c311e | 1000 | return d_count(root_dentry) > 1; |
f11459ad RK |
1001 | } |
1002 | ||
032dbb3b RK |
1003 | int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno) |
1004 | { | |
e3154e97 | 1005 | struct the_nilfs *nilfs = sb->s_fs_info; |
032dbb3b RK |
1006 | struct nilfs_root *root; |
1007 | struct inode *inode; | |
1008 | struct dentry *dentry; | |
1009 | int ret; | |
1010 | ||
3377f843 | 1011 | if (cno > nilfs->ns_cno) |
032dbb3b RK |
1012 | return false; |
1013 | ||
1014 | if (cno >= nilfs_last_cno(nilfs)) | |
1015 | return true; /* protect recent checkpoints */ | |
1016 | ||
1017 | ret = false; | |
e3154e97 | 1018 | root = nilfs_lookup_root(nilfs, cno); |
032dbb3b RK |
1019 | if (root) { |
1020 | inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO); | |
1021 | if (inode) { | |
1022 | dentry = d_find_alias(inode); | |
1023 | if (dentry) { | |
e95c311e | 1024 | ret = nilfs_tree_is_busy(dentry); |
032dbb3b RK |
1025 | dput(dentry); |
1026 | } | |
1027 | iput(inode); | |
1028 | } | |
1029 | nilfs_put_root(root); | |
1030 | } | |
1031 | return ret; | |
1032 | } | |
1033 | ||
783f6184 RK |
1034 | /** |
1035 | * nilfs_fill_super() - initialize a super block instance | |
1036 | * @sb: super_block | |
1037 | * @data: mount options | |
1038 | * @silent: silent mode flag | |
783f6184 | 1039 | * |
aa7dfb89 | 1040 | * This function is called exclusively by nilfs->ns_mount_mutex. |
783f6184 RK |
1041 | * So, the recovery process is protected from other simultaneous mounts. |
1042 | */ | |
1043 | static int | |
348fe8da | 1044 | nilfs_fill_super(struct super_block *sb, void *data, int silent) |
783f6184 | 1045 | { |
348fe8da | 1046 | struct the_nilfs *nilfs; |
4d8d9293 | 1047 | struct nilfs_root *fsroot; |
783f6184 RK |
1048 | __u64 cno; |
1049 | int err; | |
1050 | ||
6625689e | 1051 | nilfs = alloc_nilfs(sb); |
e3154e97 | 1052 | if (!nilfs) |
783f6184 RK |
1053 | return -ENOMEM; |
1054 | ||
e3154e97 | 1055 | sb->s_fs_info = nilfs; |
783f6184 | 1056 | |
f7545144 | 1057 | err = init_nilfs(nilfs, sb, (char *)data); |
783f6184 | 1058 | if (err) |
348fe8da | 1059 | goto failed_nilfs; |
783f6184 | 1060 | |
783f6184 RK |
1061 | sb->s_op = &nilfs_sops; |
1062 | sb->s_export_op = &nilfs_export_ops; | |
1063 | sb->s_root = NULL; | |
61239230 | 1064 | sb->s_time_gran = 1; |
8de52778 | 1065 | sb->s_max_links = NILFS_LINK_MAX; |
026a7d63 | 1066 | |
a11d7fc2 | 1067 | sb->s_bdi = bdi_get(sb->s_bdev->bd_disk->bdi); |
783f6184 | 1068 | |
f7545144 | 1069 | err = load_nilfs(nilfs, sb); |
f50a4c81 | 1070 | if (err) |
348fe8da | 1071 | goto failed_nilfs; |
f50a4c81 | 1072 | |
783f6184 | 1073 | cno = nilfs_last_cno(nilfs); |
f7545144 | 1074 | err = nilfs_attach_checkpoint(sb, cno, true, &fsroot); |
783f6184 | 1075 | if (err) { |
a1d0747a | 1076 | nilfs_err(sb, |
feee880f RK |
1077 | "error %d while loading last checkpoint (checkpoint number=%llu)", |
1078 | err, (unsigned long long)cno); | |
f1e89c86 | 1079 | goto failed_unload; |
783f6184 RK |
1080 | } |
1081 | ||
bc98a42c | 1082 | if (!sb_rdonly(sb)) { |
f7545144 | 1083 | err = nilfs_attach_log_writer(sb, fsroot); |
783f6184 RK |
1084 | if (err) |
1085 | goto failed_checkpoint; | |
1086 | } | |
1087 | ||
367ea334 RK |
1088 | err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root); |
1089 | if (err) | |
783f6184 | 1090 | goto failed_segctor; |
783f6184 | 1091 | |
4d8d9293 | 1092 | nilfs_put_root(fsroot); |
783f6184 | 1093 | |
bc98a42c | 1094 | if (!sb_rdonly(sb)) { |
783f6184 | 1095 | down_write(&nilfs->ns_sem); |
f7545144 | 1096 | nilfs_setup_super(sb, true); |
783f6184 RK |
1097 | up_write(&nilfs->ns_sem); |
1098 | } | |
1099 | ||
783f6184 RK |
1100 | return 0; |
1101 | ||
783f6184 | 1102 | failed_segctor: |
f7545144 | 1103 | nilfs_detach_log_writer(sb); |
783f6184 RK |
1104 | |
1105 | failed_checkpoint: | |
4d8d9293 | 1106 | nilfs_put_root(fsroot); |
783f6184 | 1107 | |
f1e89c86 | 1108 | failed_unload: |
42560f9c | 1109 | nilfs_sysfs_delete_device_group(nilfs); |
f1e89c86 RK |
1110 | iput(nilfs->ns_sufile); |
1111 | iput(nilfs->ns_cpfile); | |
1112 | iput(nilfs->ns_dat); | |
1113 | ||
348fe8da RK |
1114 | failed_nilfs: |
1115 | destroy_nilfs(nilfs); | |
783f6184 RK |
1116 | return err; |
1117 | } | |
1118 | ||
1119 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) | |
1120 | { | |
e3154e97 | 1121 | struct the_nilfs *nilfs = sb->s_fs_info; |
783f6184 | 1122 | unsigned long old_sb_flags; |
06df0f99 | 1123 | unsigned long old_mount_opt; |
f11459ad | 1124 | int err; |
783f6184 | 1125 | |
02b9984d | 1126 | sync_filesystem(sb); |
783f6184 | 1127 | old_sb_flags = sb->s_flags; |
3b2ce58b | 1128 | old_mount_opt = nilfs->ns_mount_opt; |
783f6184 | 1129 | |
7c017457 | 1130 | if (!parse_options(data, sb, 1)) { |
783f6184 RK |
1131 | err = -EINVAL; |
1132 | goto restore_opts; | |
1133 | } | |
1751e8a6 | 1134 | sb->s_flags = (sb->s_flags & ~SB_POSIXACL); |
783f6184 | 1135 | |
d240e067 | 1136 | err = -EINVAL; |
783f6184 | 1137 | |
0234576d | 1138 | if (!nilfs_valid_fs(nilfs)) { |
a1d0747a JP |
1139 | nilfs_warn(sb, |
1140 | "couldn't remount because the filesystem is in an incomplete recovery state"); | |
0234576d RK |
1141 | goto restore_opts; |
1142 | } | |
1143 | ||
1751e8a6 | 1144 | if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
783f6184 | 1145 | goto out; |
1751e8a6 | 1146 | if (*flags & SB_RDONLY) { |
1751e8a6 | 1147 | sb->s_flags |= SB_RDONLY; |
783f6184 | 1148 | |
783f6184 RK |
1149 | /* |
1150 | * Remounting a valid RW partition RDONLY, so set | |
1151 | * the RDONLY flag and then mark the partition as valid again. | |
1152 | */ | |
1153 | down_write(&nilfs->ns_sem); | |
f7545144 | 1154 | nilfs_cleanup_super(sb); |
783f6184 RK |
1155 | up_write(&nilfs->ns_sem); |
1156 | } else { | |
c5ca48aa | 1157 | __u64 features; |
e912a5b6 | 1158 | struct nilfs_root *root; |
c5ca48aa | 1159 | |
783f6184 RK |
1160 | /* |
1161 | * Mounting a RDONLY partition read-write, so reread and | |
1162 | * store the current valid flag. (It may have been changed | |
1163 | * by fsck since we originally mounted the partition.) | |
1164 | */ | |
c5ca48aa RK |
1165 | down_read(&nilfs->ns_sem); |
1166 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & | |
1167 | ~NILFS_FEATURE_COMPAT_RO_SUPP; | |
1168 | up_read(&nilfs->ns_sem); | |
1169 | if (features) { | |
a1d0747a JP |
1170 | nilfs_warn(sb, |
1171 | "couldn't remount RDWR because of unsupported optional features (%llx)", | |
1172 | (unsigned long long)features); | |
c5ca48aa RK |
1173 | err = -EROFS; |
1174 | goto restore_opts; | |
1175 | } | |
1176 | ||
1751e8a6 | 1177 | sb->s_flags &= ~SB_RDONLY; |
783f6184 | 1178 | |
2b0143b5 | 1179 | root = NILFS_I(d_inode(sb->s_root))->i_root; |
f7545144 | 1180 | err = nilfs_attach_log_writer(sb, root); |
783f6184 | 1181 | if (err) |
e59399d0 | 1182 | goto restore_opts; |
783f6184 RK |
1183 | |
1184 | down_write(&nilfs->ns_sem); | |
f7545144 | 1185 | nilfs_setup_super(sb, true); |
783f6184 | 1186 | up_write(&nilfs->ns_sem); |
783f6184 RK |
1187 | } |
1188 | out: | |
1189 | return 0; | |
1190 | ||
783f6184 RK |
1191 | restore_opts: |
1192 | sb->s_flags = old_sb_flags; | |
3b2ce58b | 1193 | nilfs->ns_mount_opt = old_mount_opt; |
783f6184 RK |
1194 | return err; |
1195 | } | |
1196 | ||
1197 | struct nilfs_super_data { | |
1198 | struct block_device *bdev; | |
1199 | __u64 cno; | |
1200 | int flags; | |
1201 | }; | |
1202 | ||
a7d3f104 RK |
1203 | static int nilfs_parse_snapshot_option(const char *option, |
1204 | const substring_t *arg, | |
1205 | struct nilfs_super_data *sd) | |
1206 | { | |
1207 | unsigned long long val; | |
1208 | const char *msg = NULL; | |
1209 | int err; | |
1210 | ||
1751e8a6 | 1211 | if (!(sd->flags & SB_RDONLY)) { |
a7d3f104 RK |
1212 | msg = "read-only option is not specified"; |
1213 | goto parse_error; | |
1214 | } | |
1215 | ||
1216 | err = kstrtoull(arg->from, 0, &val); | |
1217 | if (err) { | |
1218 | if (err == -ERANGE) | |
1219 | msg = "too large checkpoint number"; | |
1220 | else | |
1221 | msg = "malformed argument"; | |
1222 | goto parse_error; | |
1223 | } else if (val == 0) { | |
1224 | msg = "invalid checkpoint number 0"; | |
1225 | goto parse_error; | |
1226 | } | |
1227 | sd->cno = val; | |
1228 | return 0; | |
1229 | ||
1230 | parse_error: | |
a1d0747a | 1231 | nilfs_err(NULL, "invalid option \"%s\": %s", option, msg); |
a7d3f104 RK |
1232 | return 1; |
1233 | } | |
1234 | ||
783f6184 RK |
1235 | /** |
1236 | * nilfs_identify - pre-read mount options needed to identify mount instance | |
1237 | * @data: mount options | |
1238 | * @sd: nilfs_super_data | |
1239 | */ | |
1240 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) | |
1241 | { | |
1242 | char *p, *options = data; | |
1243 | substring_t args[MAX_OPT_ARGS]; | |
c05dbfc2 | 1244 | int token; |
783f6184 RK |
1245 | int ret = 0; |
1246 | ||
1247 | do { | |
1248 | p = strsep(&options, ","); | |
1249 | if (p != NULL && *p) { | |
1250 | token = match_token(p, tokens, args); | |
a7d3f104 RK |
1251 | if (token == Opt_snapshot) |
1252 | ret = nilfs_parse_snapshot_option(p, &args[0], | |
1253 | sd); | |
783f6184 RK |
1254 | } |
1255 | if (!options) | |
1256 | break; | |
1257 | BUG_ON(options == data); | |
1258 | *(options - 1) = ','; | |
1259 | } while (!ret); | |
1260 | return ret; | |
1261 | } | |
1262 | ||
1263 | static int nilfs_set_bdev_super(struct super_block *s, void *data) | |
1264 | { | |
f11459ad | 1265 | s->s_bdev = data; |
783f6184 RK |
1266 | s->s_dev = s->s_bdev->bd_dev; |
1267 | return 0; | |
1268 | } | |
1269 | ||
1270 | static int nilfs_test_bdev_super(struct super_block *s, void *data) | |
783f6184 | 1271 | { |
f11459ad | 1272 | return (void *)s->s_bdev == data; |
783f6184 RK |
1273 | } |
1274 | ||
e4c59d61 AV |
1275 | static struct dentry * |
1276 | nilfs_mount(struct file_system_type *fs_type, int flags, | |
1277 | const char *dev_name, void *data) | |
783f6184 RK |
1278 | { |
1279 | struct nilfs_super_data sd; | |
33c8e57c | 1280 | struct super_block *s; |
d4d77629 | 1281 | fmode_t mode = FMODE_READ | FMODE_EXCL; |
f11459ad RK |
1282 | struct dentry *root_dentry; |
1283 | int err, s_new = false; | |
783f6184 | 1284 | |
1751e8a6 | 1285 | if (!(flags & SB_RDONLY)) |
13e90559 RK |
1286 | mode |= FMODE_WRITE; |
1287 | ||
d4d77629 | 1288 | sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type); |
d6d4c19c | 1289 | if (IS_ERR(sd.bdev)) |
e4c59d61 | 1290 | return ERR_CAST(sd.bdev); |
783f6184 | 1291 | |
783f6184 RK |
1292 | sd.cno = 0; |
1293 | sd.flags = flags; | |
1294 | if (nilfs_identify((char *)data, &sd)) { | |
1295 | err = -EINVAL; | |
1296 | goto failed; | |
1297 | } | |
1298 | ||
6dd47406 | 1299 | /* |
5beb6e0b RK |
1300 | * once the super is inserted into the list by sget, s_umount |
1301 | * will protect the lockfs code from trying to start a snapshot | |
1302 | * while we are mounting | |
6dd47406 | 1303 | */ |
5beb6e0b RK |
1304 | mutex_lock(&sd.bdev->bd_fsfreeze_mutex); |
1305 | if (sd.bdev->bd_fsfreeze_count > 0) { | |
1306 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); | |
1307 | err = -EBUSY; | |
1308 | goto failed; | |
1309 | } | |
9249e17f DH |
1310 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, flags, |
1311 | sd.bdev); | |
5beb6e0b | 1312 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); |
33c8e57c RK |
1313 | if (IS_ERR(s)) { |
1314 | err = PTR_ERR(s); | |
348fe8da | 1315 | goto failed; |
783f6184 RK |
1316 | } |
1317 | ||
1318 | if (!s->s_root) { | |
8fa7c320 | 1319 | s_new = true; |
f11459ad | 1320 | |
33c8e57c | 1321 | /* New superblock instance created */ |
4571b82c | 1322 | s->s_mode = mode; |
a1c6f057 | 1323 | snprintf(s->s_id, sizeof(s->s_id), "%pg", sd.bdev); |
783f6184 RK |
1324 | sb_set_blocksize(s, block_size(sd.bdev)); |
1325 | ||
1751e8a6 | 1326 | err = nilfs_fill_super(s, data, flags & SB_SILENT ? 1 : 0); |
783f6184 | 1327 | if (err) |
348fe8da | 1328 | goto failed_super; |
783f6184 | 1329 | |
1751e8a6 | 1330 | s->s_flags |= SB_ACTIVE; |
f11459ad | 1331 | } else if (!sd.cno) { |
e95c311e | 1332 | if (nilfs_tree_is_busy(s->s_root)) { |
1751e8a6 | 1333 | if ((flags ^ s->s_flags) & SB_RDONLY) { |
a1d0747a | 1334 | nilfs_err(s, |
feee880f | 1335 | "the device already has a %s mount.", |
bc98a42c | 1336 | sb_rdonly(s) ? "read-only" : "read/write"); |
f11459ad RK |
1337 | err = -EBUSY; |
1338 | goto failed_super; | |
1339 | } | |
e95c311e | 1340 | } else { |
f11459ad RK |
1341 | /* |
1342 | * Try remount to setup mount states if the current | |
1343 | * tree is not mounted and only snapshots use this sb. | |
1344 | */ | |
1345 | err = nilfs_remount(s, &flags, data); | |
1346 | if (err) | |
1347 | goto failed_super; | |
1348 | } | |
783f6184 RK |
1349 | } |
1350 | ||
f11459ad RK |
1351 | if (sd.cno) { |
1352 | err = nilfs_attach_snapshot(s, sd.cno, &root_dentry); | |
348fe8da | 1353 | if (err) |
f11459ad | 1354 | goto failed_super; |
f11459ad RK |
1355 | } else { |
1356 | root_dentry = dget(s->s_root); | |
783f6184 RK |
1357 | } |
1358 | ||
f11459ad | 1359 | if (!s_new) |
d4d77629 | 1360 | blkdev_put(sd.bdev, mode); |
783f6184 | 1361 | |
e4c59d61 | 1362 | return root_dentry; |
783f6184 | 1363 | |
f11459ad | 1364 | failed_super: |
a95161aa | 1365 | deactivate_locked_super(s); |
783f6184 | 1366 | |
348fe8da RK |
1367 | failed: |
1368 | if (!s_new) | |
d4d77629 | 1369 | blkdev_put(sd.bdev, mode); |
e4c59d61 | 1370 | return ERR_PTR(err); |
783f6184 RK |
1371 | } |
1372 | ||
783f6184 RK |
1373 | struct file_system_type nilfs_fs_type = { |
1374 | .owner = THIS_MODULE, | |
1375 | .name = "nilfs2", | |
e4c59d61 | 1376 | .mount = nilfs_mount, |
783f6184 RK |
1377 | .kill_sb = kill_block_super, |
1378 | .fs_flags = FS_REQUIRES_DEV, | |
1379 | }; | |
7f78e035 | 1380 | MODULE_ALIAS_FS("nilfs2"); |
783f6184 | 1381 | |
41c88bd7 | 1382 | static void nilfs_inode_init_once(void *obj) |
783f6184 | 1383 | { |
41c88bd7 | 1384 | struct nilfs_inode_info *ii = obj; |
783f6184 | 1385 | |
41c88bd7 LH |
1386 | INIT_LIST_HEAD(&ii->i_dirty); |
1387 | #ifdef CONFIG_NILFS_XATTR | |
1388 | init_rwsem(&ii->xattr_sem); | |
1389 | #endif | |
41c88bd7 LH |
1390 | inode_init_once(&ii->vfs_inode); |
1391 | } | |
783f6184 | 1392 | |
41c88bd7 LH |
1393 | static void nilfs_segbuf_init_once(void *obj) |
1394 | { | |
1395 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); | |
1396 | } | |
783f6184 | 1397 | |
41c88bd7 LH |
1398 | static void nilfs_destroy_cachep(void) |
1399 | { | |
8c0a8537 KS |
1400 | /* |
1401 | * Make sure all delayed rcu free inodes are flushed before we | |
1402 | * destroy cache. | |
1403 | */ | |
1404 | rcu_barrier(); | |
1405 | ||
da80a39f JL |
1406 | kmem_cache_destroy(nilfs_inode_cachep); |
1407 | kmem_cache_destroy(nilfs_transaction_cachep); | |
1408 | kmem_cache_destroy(nilfs_segbuf_cachep); | |
1409 | kmem_cache_destroy(nilfs_btree_path_cache); | |
41c88bd7 | 1410 | } |
783f6184 | 1411 | |
41c88bd7 LH |
1412 | static int __init nilfs_init_cachep(void) |
1413 | { | |
1414 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", | |
1415 | sizeof(struct nilfs_inode_info), 0, | |
5d097056 VD |
1416 | SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, |
1417 | nilfs_inode_init_once); | |
41c88bd7 LH |
1418 | if (!nilfs_inode_cachep) |
1419 | goto fail; | |
1420 | ||
1421 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", | |
1422 | sizeof(struct nilfs_transaction_info), 0, | |
1423 | SLAB_RECLAIM_ACCOUNT, NULL); | |
1424 | if (!nilfs_transaction_cachep) | |
1425 | goto fail; | |
1426 | ||
1427 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", | |
1428 | sizeof(struct nilfs_segment_buffer), 0, | |
1429 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); | |
1430 | if (!nilfs_segbuf_cachep) | |
1431 | goto fail; | |
1432 | ||
1433 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", | |
1434 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, | |
1435 | 0, 0, NULL); | |
1436 | if (!nilfs_btree_path_cache) | |
1437 | goto fail; | |
783f6184 RK |
1438 | |
1439 | return 0; | |
1440 | ||
41c88bd7 LH |
1441 | fail: |
1442 | nilfs_destroy_cachep(); | |
1443 | return -ENOMEM; | |
1444 | } | |
1445 | ||
1446 | static int __init init_nilfs_fs(void) | |
1447 | { | |
1448 | int err; | |
783f6184 | 1449 | |
41c88bd7 LH |
1450 | err = nilfs_init_cachep(); |
1451 | if (err) | |
1452 | goto fail; | |
783f6184 | 1453 | |
dd70edbd | 1454 | err = nilfs_sysfs_init(); |
41c88bd7 LH |
1455 | if (err) |
1456 | goto free_cachep; | |
783f6184 | 1457 | |
dd70edbd VD |
1458 | err = register_filesystem(&nilfs_fs_type); |
1459 | if (err) | |
1460 | goto deinit_sysfs_entry; | |
1461 | ||
9f130263 | 1462 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
41c88bd7 | 1463 | return 0; |
783f6184 | 1464 | |
dd70edbd VD |
1465 | deinit_sysfs_entry: |
1466 | nilfs_sysfs_exit(); | |
41c88bd7 LH |
1467 | free_cachep: |
1468 | nilfs_destroy_cachep(); | |
1469 | fail: | |
783f6184 RK |
1470 | return err; |
1471 | } | |
1472 | ||
1473 | static void __exit exit_nilfs_fs(void) | |
1474 | { | |
41c88bd7 | 1475 | nilfs_destroy_cachep(); |
dd70edbd | 1476 | nilfs_sysfs_exit(); |
783f6184 RK |
1477 | unregister_filesystem(&nilfs_fs_type); |
1478 | } | |
1479 | ||
1480 | module_init(init_nilfs_fs) | |
1481 | module_exit(exit_nilfs_fs) |