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8a9d2191 RK |
1 | /* |
2 | * the_nilfs.c - the_nilfs shared structure. | |
3 | * | |
4 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | * | |
20 | * Written by Ryusuke Konishi <ryusuke@osrg.net> | |
21 | * | |
22 | */ | |
23 | ||
24 | #include <linux/buffer_head.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/blkdev.h> | |
27 | #include <linux/backing-dev.h> | |
e339ad31 | 28 | #include <linux/crc32.h> |
8a9d2191 RK |
29 | #include "nilfs.h" |
30 | #include "segment.h" | |
31 | #include "alloc.h" | |
32 | #include "cpfile.h" | |
33 | #include "sufile.h" | |
34 | #include "dat.h" | |
8a9d2191 RK |
35 | #include "segbuf.h" |
36 | ||
33c8e57c RK |
37 | |
38 | static LIST_HEAD(nilfs_objects); | |
39 | static DEFINE_SPINLOCK(nilfs_lock); | |
40 | ||
8a9d2191 RK |
41 | void nilfs_set_last_segment(struct the_nilfs *nilfs, |
42 | sector_t start_blocknr, u64 seq, __u64 cno) | |
43 | { | |
44 | spin_lock(&nilfs->ns_last_segment_lock); | |
45 | nilfs->ns_last_pseg = start_blocknr; | |
46 | nilfs->ns_last_seq = seq; | |
47 | nilfs->ns_last_cno = cno; | |
48 | spin_unlock(&nilfs->ns_last_segment_lock); | |
49 | } | |
50 | ||
51 | /** | |
52 | * alloc_nilfs - allocate the_nilfs structure | |
53 | * @bdev: block device to which the_nilfs is related | |
54 | * | |
55 | * alloc_nilfs() allocates memory for the_nilfs and | |
56 | * initializes its reference count and locks. | |
57 | * | |
58 | * Return Value: On success, pointer to the_nilfs is returned. | |
59 | * On error, NULL is returned. | |
60 | */ | |
33c8e57c | 61 | static struct the_nilfs *alloc_nilfs(struct block_device *bdev) |
8a9d2191 RK |
62 | { |
63 | struct the_nilfs *nilfs; | |
64 | ||
65 | nilfs = kzalloc(sizeof(*nilfs), GFP_KERNEL); | |
66 | if (!nilfs) | |
67 | return NULL; | |
68 | ||
69 | nilfs->ns_bdev = bdev; | |
70 | atomic_set(&nilfs->ns_count, 1); | |
8a9d2191 RK |
71 | atomic_set(&nilfs->ns_ndirtyblks, 0); |
72 | init_rwsem(&nilfs->ns_sem); | |
e59399d0 | 73 | init_rwsem(&nilfs->ns_super_sem); |
aa7dfb89 | 74 | mutex_init(&nilfs->ns_mount_mutex); |
027d6404 | 75 | init_rwsem(&nilfs->ns_writer_sem); |
33c8e57c | 76 | INIT_LIST_HEAD(&nilfs->ns_list); |
8a9d2191 RK |
77 | INIT_LIST_HEAD(&nilfs->ns_supers); |
78 | spin_lock_init(&nilfs->ns_last_segment_lock); | |
79 | nilfs->ns_gc_inodes_h = NULL; | |
8a9d2191 | 80 | init_rwsem(&nilfs->ns_segctor_sem); |
8a9d2191 RK |
81 | |
82 | return nilfs; | |
83 | } | |
84 | ||
33c8e57c RK |
85 | /** |
86 | * find_or_create_nilfs - find or create nilfs object | |
87 | * @bdev: block device to which the_nilfs is related | |
88 | * | |
89 | * find_nilfs() looks up an existent nilfs object created on the | |
90 | * device and gets the reference count of the object. If no nilfs object | |
91 | * is found on the device, a new nilfs object is allocated. | |
92 | * | |
93 | * Return Value: On success, pointer to the nilfs object is returned. | |
94 | * On error, NULL is returned. | |
95 | */ | |
96 | struct the_nilfs *find_or_create_nilfs(struct block_device *bdev) | |
97 | { | |
98 | struct the_nilfs *nilfs, *new = NULL; | |
99 | ||
100 | retry: | |
101 | spin_lock(&nilfs_lock); | |
102 | list_for_each_entry(nilfs, &nilfs_objects, ns_list) { | |
103 | if (nilfs->ns_bdev == bdev) { | |
104 | get_nilfs(nilfs); | |
105 | spin_unlock(&nilfs_lock); | |
106 | if (new) | |
107 | put_nilfs(new); | |
108 | return nilfs; /* existing object */ | |
109 | } | |
110 | } | |
111 | if (new) { | |
112 | list_add_tail(&new->ns_list, &nilfs_objects); | |
113 | spin_unlock(&nilfs_lock); | |
114 | return new; /* new object */ | |
115 | } | |
116 | spin_unlock(&nilfs_lock); | |
117 | ||
118 | new = alloc_nilfs(bdev); | |
119 | if (new) | |
120 | goto retry; | |
121 | return NULL; /* insufficient memory */ | |
122 | } | |
123 | ||
8a9d2191 RK |
124 | /** |
125 | * put_nilfs - release a reference to the_nilfs | |
126 | * @nilfs: the_nilfs structure to be released | |
127 | * | |
128 | * put_nilfs() decrements a reference counter of the_nilfs. | |
129 | * If the reference count reaches zero, the_nilfs is freed. | |
130 | */ | |
131 | void put_nilfs(struct the_nilfs *nilfs) | |
132 | { | |
33c8e57c RK |
133 | spin_lock(&nilfs_lock); |
134 | if (!atomic_dec_and_test(&nilfs->ns_count)) { | |
135 | spin_unlock(&nilfs_lock); | |
8a9d2191 | 136 | return; |
33c8e57c RK |
137 | } |
138 | list_del_init(&nilfs->ns_list); | |
139 | spin_unlock(&nilfs_lock); | |
140 | ||
8a9d2191 | 141 | /* |
33c8e57c | 142 | * Increment of ns_count never occurs below because the caller |
8a9d2191 RK |
143 | * of get_nilfs() holds at least one reference to the_nilfs. |
144 | * Thus its exclusion control is not required here. | |
145 | */ | |
33c8e57c | 146 | |
8a9d2191 RK |
147 | might_sleep(); |
148 | if (nilfs_loaded(nilfs)) { | |
8a9d2191 | 149 | nilfs_mdt_destroy(nilfs->ns_sufile); |
8a9d2191 | 150 | nilfs_mdt_destroy(nilfs->ns_cpfile); |
8a9d2191 | 151 | nilfs_mdt_destroy(nilfs->ns_dat); |
8a9d2191 RK |
152 | nilfs_mdt_destroy(nilfs->ns_gc_dat); |
153 | } | |
154 | if (nilfs_init(nilfs)) { | |
155 | nilfs_destroy_gccache(nilfs); | |
e339ad31 RK |
156 | brelse(nilfs->ns_sbh[0]); |
157 | brelse(nilfs->ns_sbh[1]); | |
8a9d2191 RK |
158 | } |
159 | kfree(nilfs); | |
160 | } | |
161 | ||
8b94025c | 162 | static int nilfs_load_super_root(struct the_nilfs *nilfs, sector_t sr_block) |
8a9d2191 RK |
163 | { |
164 | struct buffer_head *bh_sr; | |
165 | struct nilfs_super_root *raw_sr; | |
e339ad31 | 166 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
8a9d2191 RK |
167 | unsigned dat_entry_size, segment_usage_size, checkpoint_size; |
168 | unsigned inode_size; | |
169 | int err; | |
170 | ||
8b94025c | 171 | err = nilfs_read_super_root_block(nilfs, sr_block, &bh_sr, 1); |
8a9d2191 RK |
172 | if (unlikely(err)) |
173 | return err; | |
174 | ||
175 | down_read(&nilfs->ns_sem); | |
e339ad31 RK |
176 | dat_entry_size = le16_to_cpu(sbp[0]->s_dat_entry_size); |
177 | checkpoint_size = le16_to_cpu(sbp[0]->s_checkpoint_size); | |
178 | segment_usage_size = le16_to_cpu(sbp[0]->s_segment_usage_size); | |
8a9d2191 RK |
179 | up_read(&nilfs->ns_sem); |
180 | ||
181 | inode_size = nilfs->ns_inode_size; | |
182 | ||
183 | err = -ENOMEM; | |
79739565 | 184 | nilfs->ns_dat = nilfs_dat_new(nilfs, dat_entry_size); |
8a9d2191 RK |
185 | if (unlikely(!nilfs->ns_dat)) |
186 | goto failed; | |
187 | ||
79739565 | 188 | nilfs->ns_gc_dat = nilfs_dat_new(nilfs, dat_entry_size); |
8a9d2191 RK |
189 | if (unlikely(!nilfs->ns_gc_dat)) |
190 | goto failed_dat; | |
191 | ||
79739565 | 192 | nilfs->ns_cpfile = nilfs_cpfile_new(nilfs, checkpoint_size); |
8a9d2191 RK |
193 | if (unlikely(!nilfs->ns_cpfile)) |
194 | goto failed_gc_dat; | |
195 | ||
79739565 | 196 | nilfs->ns_sufile = nilfs_sufile_new(nilfs, segment_usage_size); |
8a9d2191 RK |
197 | if (unlikely(!nilfs->ns_sufile)) |
198 | goto failed_cpfile; | |
199 | ||
8a9d2191 | 200 | nilfs_mdt_set_shadow(nilfs->ns_dat, nilfs->ns_gc_dat); |
8a9d2191 | 201 | |
8707df38 RK |
202 | err = nilfs_dat_read(nilfs->ns_dat, (void *)bh_sr->b_data + |
203 | NILFS_SR_DAT_OFFSET(inode_size)); | |
8a9d2191 RK |
204 | if (unlikely(err)) |
205 | goto failed_sufile; | |
206 | ||
8707df38 RK |
207 | err = nilfs_cpfile_read(nilfs->ns_cpfile, (void *)bh_sr->b_data + |
208 | NILFS_SR_CPFILE_OFFSET(inode_size)); | |
8a9d2191 RK |
209 | if (unlikely(err)) |
210 | goto failed_sufile; | |
211 | ||
8707df38 RK |
212 | err = nilfs_sufile_read(nilfs->ns_sufile, (void *)bh_sr->b_data + |
213 | NILFS_SR_SUFILE_OFFSET(inode_size)); | |
8a9d2191 RK |
214 | if (unlikely(err)) |
215 | goto failed_sufile; | |
216 | ||
217 | raw_sr = (struct nilfs_super_root *)bh_sr->b_data; | |
218 | nilfs->ns_nongc_ctime = le64_to_cpu(raw_sr->sr_nongc_ctime); | |
219 | ||
220 | failed: | |
221 | brelse(bh_sr); | |
222 | return err; | |
223 | ||
224 | failed_sufile: | |
225 | nilfs_mdt_destroy(nilfs->ns_sufile); | |
226 | ||
227 | failed_cpfile: | |
228 | nilfs_mdt_destroy(nilfs->ns_cpfile); | |
229 | ||
230 | failed_gc_dat: | |
231 | nilfs_mdt_destroy(nilfs->ns_gc_dat); | |
232 | ||
233 | failed_dat: | |
234 | nilfs_mdt_destroy(nilfs->ns_dat); | |
235 | goto failed; | |
236 | } | |
237 | ||
238 | static void nilfs_init_recovery_info(struct nilfs_recovery_info *ri) | |
239 | { | |
240 | memset(ri, 0, sizeof(*ri)); | |
241 | INIT_LIST_HEAD(&ri->ri_used_segments); | |
242 | } | |
243 | ||
244 | static void nilfs_clear_recovery_info(struct nilfs_recovery_info *ri) | |
245 | { | |
246 | nilfs_dispose_segment_list(&ri->ri_used_segments); | |
247 | } | |
248 | ||
249 | /** | |
250 | * load_nilfs - load and recover the nilfs | |
251 | * @nilfs: the_nilfs structure to be released | |
252 | * @sbi: nilfs_sb_info used to recover past segment | |
253 | * | |
254 | * load_nilfs() searches and load the latest super root, | |
255 | * attaches the last segment, and does recovery if needed. | |
256 | * The caller must call this exclusively for simultaneous mounts. | |
257 | */ | |
258 | int load_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi) | |
259 | { | |
260 | struct nilfs_recovery_info ri; | |
261 | unsigned int s_flags = sbi->s_super->s_flags; | |
262 | int really_read_only = bdev_read_only(nilfs->ns_bdev); | |
a057d2c0 | 263 | int valid_fs = nilfs_valid_fs(nilfs); |
f50a4c81 | 264 | int err; |
8a9d2191 | 265 | |
0234576d RK |
266 | if (nilfs_loaded(nilfs)) { |
267 | if (valid_fs || | |
268 | ((s_flags & MS_RDONLY) && nilfs_test_opt(sbi, NORECOVERY))) | |
269 | return 0; | |
270 | printk(KERN_ERR "NILFS: the filesystem is in an incomplete " | |
271 | "recovery state.\n"); | |
272 | return -EINVAL; | |
273 | } | |
8a9d2191 | 274 | |
f50a4c81 RK |
275 | if (!valid_fs) { |
276 | printk(KERN_WARNING "NILFS warning: mounting unchecked fs\n"); | |
277 | if (s_flags & MS_RDONLY) { | |
278 | printk(KERN_INFO "NILFS: INFO: recovery " | |
279 | "required for readonly filesystem.\n"); | |
280 | printk(KERN_INFO "NILFS: write access will " | |
281 | "be enabled during recovery.\n"); | |
8a9d2191 | 282 | } |
8a9d2191 RK |
283 | } |
284 | ||
f50a4c81 RK |
285 | nilfs_init_recovery_info(&ri); |
286 | ||
8b94025c | 287 | err = nilfs_search_super_root(nilfs, &ri); |
8a9d2191 RK |
288 | if (unlikely(err)) { |
289 | printk(KERN_ERR "NILFS: error searching super root.\n"); | |
290 | goto failed; | |
291 | } | |
292 | ||
8b94025c | 293 | err = nilfs_load_super_root(nilfs, ri.ri_super_root); |
8a9d2191 RK |
294 | if (unlikely(err)) { |
295 | printk(KERN_ERR "NILFS: error loading super root.\n"); | |
296 | goto failed; | |
297 | } | |
298 | ||
f50a4c81 RK |
299 | if (valid_fs) |
300 | goto skip_recovery; | |
301 | ||
302 | if (s_flags & MS_RDONLY) { | |
0234576d RK |
303 | if (nilfs_test_opt(sbi, NORECOVERY)) { |
304 | printk(KERN_INFO "NILFS: norecovery option specified. " | |
305 | "skipping roll-forward recovery\n"); | |
306 | goto skip_recovery; | |
307 | } | |
f50a4c81 RK |
308 | if (really_read_only) { |
309 | printk(KERN_ERR "NILFS: write access " | |
310 | "unavailable, cannot proceed.\n"); | |
311 | err = -EROFS; | |
312 | goto failed_unload; | |
8a9d2191 | 313 | } |
f50a4c81 | 314 | sbi->s_super->s_flags &= ~MS_RDONLY; |
0234576d RK |
315 | } else if (nilfs_test_opt(sbi, NORECOVERY)) { |
316 | printk(KERN_ERR "NILFS: recovery cancelled because norecovery " | |
317 | "option was specified for a read/write mount\n"); | |
318 | err = -EINVAL; | |
319 | goto failed_unload; | |
f50a4c81 RK |
320 | } |
321 | ||
322 | err = nilfs_recover_logical_segments(nilfs, sbi, &ri); | |
323 | if (err) | |
324 | goto failed_unload; | |
325 | ||
326 | down_write(&nilfs->ns_sem); | |
327 | nilfs->ns_mount_state |= NILFS_VALID_FS; | |
328 | nilfs->ns_sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state); | |
329 | err = nilfs_commit_super(sbi, 1); | |
330 | up_write(&nilfs->ns_sem); | |
331 | ||
332 | if (err) { | |
333 | printk(KERN_ERR "NILFS: failed to update super block. " | |
334 | "recovery unfinished.\n"); | |
335 | goto failed_unload; | |
8a9d2191 | 336 | } |
f50a4c81 | 337 | printk(KERN_INFO "NILFS: recovery complete.\n"); |
8a9d2191 | 338 | |
f50a4c81 | 339 | skip_recovery: |
8a9d2191 | 340 | set_nilfs_loaded(nilfs); |
f50a4c81 RK |
341 | nilfs_clear_recovery_info(&ri); |
342 | sbi->s_super->s_flags = s_flags; | |
343 | return 0; | |
344 | ||
345 | failed_unload: | |
346 | nilfs_mdt_destroy(nilfs->ns_cpfile); | |
347 | nilfs_mdt_destroy(nilfs->ns_sufile); | |
348 | nilfs_mdt_destroy(nilfs->ns_dat); | |
8a9d2191 RK |
349 | |
350 | failed: | |
351 | nilfs_clear_recovery_info(&ri); | |
352 | sbi->s_super->s_flags = s_flags; | |
353 | return err; | |
354 | } | |
355 | ||
356 | static unsigned long long nilfs_max_size(unsigned int blkbits) | |
357 | { | |
358 | unsigned int max_bits; | |
359 | unsigned long long res = MAX_LFS_FILESIZE; /* page cache limit */ | |
360 | ||
361 | max_bits = blkbits + NILFS_BMAP_KEY_BIT; /* bmap size limit */ | |
362 | if (max_bits < 64) | |
363 | res = min_t(unsigned long long, res, (1ULL << max_bits) - 1); | |
364 | return res; | |
365 | } | |
366 | ||
e339ad31 RK |
367 | static int nilfs_store_disk_layout(struct the_nilfs *nilfs, |
368 | struct nilfs_super_block *sbp) | |
8a9d2191 RK |
369 | { |
370 | if (le32_to_cpu(sbp->s_rev_level) != NILFS_CURRENT_REV) { | |
371 | printk(KERN_ERR "NILFS: revision mismatch " | |
372 | "(superblock rev.=%d.%d, current rev.=%d.%d). " | |
373 | "Please check the version of mkfs.nilfs.\n", | |
374 | le32_to_cpu(sbp->s_rev_level), | |
375 | le16_to_cpu(sbp->s_minor_rev_level), | |
376 | NILFS_CURRENT_REV, NILFS_MINOR_REV); | |
377 | return -EINVAL; | |
378 | } | |
e339ad31 RK |
379 | nilfs->ns_sbsize = le16_to_cpu(sbp->s_bytes); |
380 | if (nilfs->ns_sbsize > BLOCK_SIZE) | |
381 | return -EINVAL; | |
382 | ||
8a9d2191 RK |
383 | nilfs->ns_inode_size = le16_to_cpu(sbp->s_inode_size); |
384 | nilfs->ns_first_ino = le32_to_cpu(sbp->s_first_ino); | |
385 | ||
386 | nilfs->ns_blocks_per_segment = le32_to_cpu(sbp->s_blocks_per_segment); | |
387 | if (nilfs->ns_blocks_per_segment < NILFS_SEG_MIN_BLOCKS) { | |
c91cea11 | 388 | printk(KERN_ERR "NILFS: too short segment.\n"); |
8a9d2191 RK |
389 | return -EINVAL; |
390 | } | |
391 | ||
392 | nilfs->ns_first_data_block = le64_to_cpu(sbp->s_first_data_block); | |
393 | nilfs->ns_nsegments = le64_to_cpu(sbp->s_nsegments); | |
394 | nilfs->ns_r_segments_percentage = | |
395 | le32_to_cpu(sbp->s_r_segments_percentage); | |
396 | nilfs->ns_nrsvsegs = | |
397 | max_t(unsigned long, NILFS_MIN_NRSVSEGS, | |
398 | DIV_ROUND_UP(nilfs->ns_nsegments * | |
399 | nilfs->ns_r_segments_percentage, 100)); | |
400 | nilfs->ns_crc_seed = le32_to_cpu(sbp->s_crc_seed); | |
401 | return 0; | |
402 | } | |
403 | ||
e339ad31 RK |
404 | static int nilfs_valid_sb(struct nilfs_super_block *sbp) |
405 | { | |
406 | static unsigned char sum[4]; | |
407 | const int sumoff = offsetof(struct nilfs_super_block, s_sum); | |
408 | size_t bytes; | |
409 | u32 crc; | |
410 | ||
411 | if (!sbp || le16_to_cpu(sbp->s_magic) != NILFS_SUPER_MAGIC) | |
412 | return 0; | |
413 | bytes = le16_to_cpu(sbp->s_bytes); | |
414 | if (bytes > BLOCK_SIZE) | |
415 | return 0; | |
416 | crc = crc32_le(le32_to_cpu(sbp->s_crc_seed), (unsigned char *)sbp, | |
417 | sumoff); | |
418 | crc = crc32_le(crc, sum, 4); | |
419 | crc = crc32_le(crc, (unsigned char *)sbp + sumoff + 4, | |
420 | bytes - sumoff - 4); | |
421 | return crc == le32_to_cpu(sbp->s_sum); | |
422 | } | |
423 | ||
424 | static int nilfs_sb2_bad_offset(struct nilfs_super_block *sbp, u64 offset) | |
425 | { | |
426 | return offset < ((le64_to_cpu(sbp->s_nsegments) * | |
427 | le32_to_cpu(sbp->s_blocks_per_segment)) << | |
428 | (le32_to_cpu(sbp->s_log_block_size) + 10)); | |
429 | } | |
430 | ||
431 | static void nilfs_release_super_block(struct the_nilfs *nilfs) | |
432 | { | |
433 | int i; | |
434 | ||
435 | for (i = 0; i < 2; i++) { | |
436 | if (nilfs->ns_sbp[i]) { | |
437 | brelse(nilfs->ns_sbh[i]); | |
438 | nilfs->ns_sbh[i] = NULL; | |
439 | nilfs->ns_sbp[i] = NULL; | |
440 | } | |
441 | } | |
442 | } | |
443 | ||
444 | void nilfs_fall_back_super_block(struct the_nilfs *nilfs) | |
445 | { | |
446 | brelse(nilfs->ns_sbh[0]); | |
447 | nilfs->ns_sbh[0] = nilfs->ns_sbh[1]; | |
448 | nilfs->ns_sbp[0] = nilfs->ns_sbp[1]; | |
449 | nilfs->ns_sbh[1] = NULL; | |
450 | nilfs->ns_sbp[1] = NULL; | |
451 | } | |
452 | ||
453 | void nilfs_swap_super_block(struct the_nilfs *nilfs) | |
454 | { | |
455 | struct buffer_head *tsbh = nilfs->ns_sbh[0]; | |
456 | struct nilfs_super_block *tsbp = nilfs->ns_sbp[0]; | |
457 | ||
458 | nilfs->ns_sbh[0] = nilfs->ns_sbh[1]; | |
459 | nilfs->ns_sbp[0] = nilfs->ns_sbp[1]; | |
460 | nilfs->ns_sbh[1] = tsbh; | |
461 | nilfs->ns_sbp[1] = tsbp; | |
462 | } | |
463 | ||
464 | static int nilfs_load_super_block(struct the_nilfs *nilfs, | |
465 | struct super_block *sb, int blocksize, | |
466 | struct nilfs_super_block **sbpp) | |
467 | { | |
468 | struct nilfs_super_block **sbp = nilfs->ns_sbp; | |
469 | struct buffer_head **sbh = nilfs->ns_sbh; | |
470 | u64 sb2off = NILFS_SB2_OFFSET_BYTES(nilfs->ns_bdev->bd_inode->i_size); | |
471 | int valid[2], swp = 0; | |
472 | ||
473 | sbp[0] = nilfs_read_super_block(sb, NILFS_SB_OFFSET_BYTES, blocksize, | |
474 | &sbh[0]); | |
475 | sbp[1] = nilfs_read_super_block(sb, sb2off, blocksize, &sbh[1]); | |
476 | ||
477 | if (!sbp[0]) { | |
478 | if (!sbp[1]) { | |
479 | printk(KERN_ERR "NILFS: unable to read superblock\n"); | |
480 | return -EIO; | |
481 | } | |
482 | printk(KERN_WARNING | |
483 | "NILFS warning: unable to read primary superblock\n"); | |
484 | } else if (!sbp[1]) | |
485 | printk(KERN_WARNING | |
486 | "NILFS warning: unable to read secondary superblock\n"); | |
487 | ||
25294d8c RK |
488 | /* |
489 | * Compare two super blocks and set 1 in swp if the secondary | |
490 | * super block is valid and newer. Otherwise, set 0 in swp. | |
491 | */ | |
e339ad31 RK |
492 | valid[0] = nilfs_valid_sb(sbp[0]); |
493 | valid[1] = nilfs_valid_sb(sbp[1]); | |
25294d8c RK |
494 | swp = valid[1] && (!valid[0] || |
495 | le64_to_cpu(sbp[1]->s_last_cno) > | |
496 | le64_to_cpu(sbp[0]->s_last_cno)); | |
e339ad31 RK |
497 | |
498 | if (valid[swp] && nilfs_sb2_bad_offset(sbp[swp], sb2off)) { | |
499 | brelse(sbh[1]); | |
500 | sbh[1] = NULL; | |
501 | sbp[1] = NULL; | |
502 | swp = 0; | |
503 | } | |
504 | if (!valid[swp]) { | |
505 | nilfs_release_super_block(nilfs); | |
506 | printk(KERN_ERR "NILFS: Can't find nilfs on dev %s.\n", | |
507 | sb->s_id); | |
508 | return -EINVAL; | |
509 | } | |
510 | ||
511 | if (swp) { | |
512 | printk(KERN_WARNING "NILFS warning: broken superblock. " | |
513 | "using spare superblock.\n"); | |
514 | nilfs_swap_super_block(nilfs); | |
515 | } | |
516 | ||
517 | nilfs->ns_sbwtime[0] = le64_to_cpu(sbp[0]->s_wtime); | |
518 | nilfs->ns_sbwtime[1] = valid[!swp] ? le64_to_cpu(sbp[1]->s_wtime) : 0; | |
519 | nilfs->ns_prot_seq = le64_to_cpu(sbp[valid[1] & !swp]->s_last_seq); | |
520 | *sbpp = sbp[0]; | |
521 | return 0; | |
522 | } | |
523 | ||
8a9d2191 RK |
524 | /** |
525 | * init_nilfs - initialize a NILFS instance. | |
526 | * @nilfs: the_nilfs structure | |
527 | * @sbi: nilfs_sb_info | |
528 | * @sb: super block | |
529 | * @data: mount options | |
530 | * | |
531 | * init_nilfs() performs common initialization per block device (e.g. | |
532 | * reading the super block, getting disk layout information, initializing | |
533 | * shared fields in the_nilfs). It takes on some portion of the jobs | |
534 | * typically done by a fill_super() routine. This division arises from | |
535 | * the nature that multiple NILFS instances may be simultaneously | |
536 | * mounted on a device. | |
537 | * For multiple mounts on the same device, only the first mount | |
538 | * invokes these tasks. | |
539 | * | |
540 | * Return Value: On success, 0 is returned. On error, a negative error | |
541 | * code is returned. | |
542 | */ | |
543 | int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data) | |
544 | { | |
545 | struct super_block *sb = sbi->s_super; | |
8a9d2191 RK |
546 | struct nilfs_super_block *sbp; |
547 | struct backing_dev_info *bdi; | |
548 | int blocksize; | |
e339ad31 | 549 | int err; |
8a9d2191 RK |
550 | |
551 | down_write(&nilfs->ns_sem); | |
552 | if (nilfs_init(nilfs)) { | |
553 | /* Load values from existing the_nilfs */ | |
e339ad31 | 554 | sbp = nilfs->ns_sbp[0]; |
8a9d2191 RK |
555 | err = nilfs_store_magic_and_option(sb, sbp, data); |
556 | if (err) | |
557 | goto out; | |
558 | ||
559 | blocksize = BLOCK_SIZE << le32_to_cpu(sbp->s_log_block_size); | |
560 | if (sb->s_blocksize != blocksize && | |
561 | !sb_set_blocksize(sb, blocksize)) { | |
562 | printk(KERN_ERR "NILFS: blocksize %d unfit to device\n", | |
563 | blocksize); | |
564 | err = -EINVAL; | |
565 | } | |
566 | sb->s_maxbytes = nilfs_max_size(sb->s_blocksize_bits); | |
567 | goto out; | |
568 | } | |
569 | ||
e339ad31 RK |
570 | blocksize = sb_min_blocksize(sb, BLOCK_SIZE); |
571 | if (!blocksize) { | |
572 | printk(KERN_ERR "NILFS: unable to set blocksize\n"); | |
8a9d2191 RK |
573 | err = -EINVAL; |
574 | goto out; | |
575 | } | |
e339ad31 RK |
576 | err = nilfs_load_super_block(nilfs, sb, blocksize, &sbp); |
577 | if (err) | |
578 | goto out; | |
579 | ||
8a9d2191 RK |
580 | err = nilfs_store_magic_and_option(sb, sbp, data); |
581 | if (err) | |
582 | goto failed_sbh; | |
583 | ||
584 | blocksize = BLOCK_SIZE << le32_to_cpu(sbp->s_log_block_size); | |
585 | if (sb->s_blocksize != blocksize) { | |
e1defc4f | 586 | int hw_blocksize = bdev_logical_block_size(sb->s_bdev); |
e339ad31 RK |
587 | |
588 | if (blocksize < hw_blocksize) { | |
589 | printk(KERN_ERR | |
590 | "NILFS: blocksize %d too small for device " | |
591 | "(sector-size = %d).\n", | |
592 | blocksize, hw_blocksize); | |
8a9d2191 | 593 | err = -EINVAL; |
e339ad31 RK |
594 | goto failed_sbh; |
595 | } | |
596 | nilfs_release_super_block(nilfs); | |
597 | sb_set_blocksize(sb, blocksize); | |
598 | ||
599 | err = nilfs_load_super_block(nilfs, sb, blocksize, &sbp); | |
600 | if (err) | |
8a9d2191 RK |
601 | goto out; |
602 | /* not failed_sbh; sbh is released automatically | |
603 | when reloading fails. */ | |
8a9d2191 RK |
604 | } |
605 | nilfs->ns_blocksize_bits = sb->s_blocksize_bits; | |
92c60cca | 606 | nilfs->ns_blocksize = blocksize; |
8a9d2191 | 607 | |
e339ad31 | 608 | err = nilfs_store_disk_layout(nilfs, sbp); |
8a9d2191 RK |
609 | if (err) |
610 | goto failed_sbh; | |
611 | ||
612 | sb->s_maxbytes = nilfs_max_size(sb->s_blocksize_bits); | |
613 | ||
614 | nilfs->ns_mount_state = le16_to_cpu(sbp->s_state); | |
8a9d2191 | 615 | |
2c96ce9f | 616 | bdi = nilfs->ns_bdev->bd_inode->i_mapping->backing_dev_info; |
8a9d2191 RK |
617 | nilfs->ns_bdi = bdi ? : &default_backing_dev_info; |
618 | ||
619 | /* Finding last segment */ | |
620 | nilfs->ns_last_pseg = le64_to_cpu(sbp->s_last_pseg); | |
621 | nilfs->ns_last_cno = le64_to_cpu(sbp->s_last_cno); | |
622 | nilfs->ns_last_seq = le64_to_cpu(sbp->s_last_seq); | |
623 | ||
624 | nilfs->ns_seg_seq = nilfs->ns_last_seq; | |
625 | nilfs->ns_segnum = | |
626 | nilfs_get_segnum_of_block(nilfs, nilfs->ns_last_pseg); | |
627 | nilfs->ns_cno = nilfs->ns_last_cno + 1; | |
628 | if (nilfs->ns_segnum >= nilfs->ns_nsegments) { | |
629 | printk(KERN_ERR "NILFS invalid last segment number.\n"); | |
630 | err = -EINVAL; | |
631 | goto failed_sbh; | |
632 | } | |
633 | /* Dummy values */ | |
634 | nilfs->ns_free_segments_count = | |
635 | nilfs->ns_nsegments - (nilfs->ns_segnum + 1); | |
636 | ||
637 | /* Initialize gcinode cache */ | |
638 | err = nilfs_init_gccache(nilfs); | |
639 | if (err) | |
640 | goto failed_sbh; | |
641 | ||
642 | set_nilfs_init(nilfs); | |
643 | err = 0; | |
644 | out: | |
645 | up_write(&nilfs->ns_sem); | |
646 | return err; | |
647 | ||
648 | failed_sbh: | |
e339ad31 | 649 | nilfs_release_super_block(nilfs); |
8a9d2191 RK |
650 | goto out; |
651 | } | |
652 | ||
e902ec99 JS |
653 | int nilfs_discard_segments(struct the_nilfs *nilfs, __u64 *segnump, |
654 | size_t nsegs) | |
655 | { | |
656 | sector_t seg_start, seg_end; | |
657 | sector_t start = 0, nblocks = 0; | |
658 | unsigned int sects_per_block; | |
659 | __u64 *sn; | |
660 | int ret = 0; | |
661 | ||
662 | sects_per_block = (1 << nilfs->ns_blocksize_bits) / | |
663 | bdev_logical_block_size(nilfs->ns_bdev); | |
664 | for (sn = segnump; sn < segnump + nsegs; sn++) { | |
665 | nilfs_get_segment_range(nilfs, *sn, &seg_start, &seg_end); | |
666 | ||
667 | if (!nblocks) { | |
668 | start = seg_start; | |
669 | nblocks = seg_end - seg_start + 1; | |
670 | } else if (start + nblocks == seg_start) { | |
671 | nblocks += seg_end - seg_start + 1; | |
672 | } else { | |
673 | ret = blkdev_issue_discard(nilfs->ns_bdev, | |
674 | start * sects_per_block, | |
675 | nblocks * sects_per_block, | |
676 | GFP_NOFS, | |
6a47dc14 | 677 | BLKDEV_IFL_BARRIER); |
e902ec99 JS |
678 | if (ret < 0) |
679 | return ret; | |
680 | nblocks = 0; | |
681 | } | |
682 | } | |
683 | if (nblocks) | |
684 | ret = blkdev_issue_discard(nilfs->ns_bdev, | |
685 | start * sects_per_block, | |
686 | nblocks * sects_per_block, | |
6a47dc14 | 687 | GFP_NOFS, BLKDEV_IFL_BARRIER); |
e902ec99 JS |
688 | return ret; |
689 | } | |
690 | ||
8a9d2191 RK |
691 | int nilfs_count_free_blocks(struct the_nilfs *nilfs, sector_t *nblocks) |
692 | { | |
693 | struct inode *dat = nilfs_dat_inode(nilfs); | |
694 | unsigned long ncleansegs; | |
8a9d2191 RK |
695 | |
696 | down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
ef7d4757 | 697 | ncleansegs = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile); |
8a9d2191 | 698 | up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ |
ef7d4757 RK |
699 | *nblocks = (sector_t)ncleansegs * nilfs->ns_blocks_per_segment; |
700 | return 0; | |
8a9d2191 RK |
701 | } |
702 | ||
8a9d2191 RK |
703 | int nilfs_near_disk_full(struct the_nilfs *nilfs) |
704 | { | |
8a9d2191 | 705 | unsigned long ncleansegs, nincsegs; |
ef7d4757 RK |
706 | |
707 | ncleansegs = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile); | |
708 | nincsegs = atomic_read(&nilfs->ns_ndirtyblks) / | |
709 | nilfs->ns_blocks_per_segment + 1; | |
710 | ||
711 | return ncleansegs <= nilfs->ns_nrsvsegs + nincsegs; | |
8a9d2191 RK |
712 | } |
713 | ||
6dd47406 RK |
714 | /** |
715 | * nilfs_find_sbinfo - find existing nilfs_sb_info structure | |
716 | * @nilfs: nilfs object | |
717 | * @rw_mount: mount type (non-zero value for read/write mount) | |
718 | * @cno: checkpoint number (zero for read-only mount) | |
719 | * | |
720 | * nilfs_find_sbinfo() returns the nilfs_sb_info structure which | |
721 | * @rw_mount and @cno (in case of snapshots) matched. If no instance | |
722 | * was found, NULL is returned. Although the super block instance can | |
723 | * be unmounted after this function returns, the nilfs_sb_info struct | |
724 | * is kept on memory until nilfs_put_sbinfo() is called. | |
725 | */ | |
726 | struct nilfs_sb_info *nilfs_find_sbinfo(struct the_nilfs *nilfs, | |
727 | int rw_mount, __u64 cno) | |
728 | { | |
729 | struct nilfs_sb_info *sbi; | |
730 | ||
e59399d0 | 731 | down_read(&nilfs->ns_super_sem); |
6dd47406 RK |
732 | /* |
733 | * The SNAPSHOT flag and sb->s_flags are supposed to be | |
e59399d0 | 734 | * protected with nilfs->ns_super_sem. |
6dd47406 RK |
735 | */ |
736 | sbi = nilfs->ns_current; | |
737 | if (rw_mount) { | |
738 | if (sbi && !(sbi->s_super->s_flags & MS_RDONLY)) | |
739 | goto found; /* read/write mount */ | |
740 | else | |
741 | goto out; | |
742 | } else if (cno == 0) { | |
743 | if (sbi && (sbi->s_super->s_flags & MS_RDONLY)) | |
744 | goto found; /* read-only mount */ | |
745 | else | |
746 | goto out; | |
747 | } | |
748 | ||
749 | list_for_each_entry(sbi, &nilfs->ns_supers, s_list) { | |
750 | if (nilfs_test_opt(sbi, SNAPSHOT) && | |
751 | sbi->s_snapshot_cno == cno) | |
752 | goto found; /* snapshot mount */ | |
753 | } | |
754 | out: | |
e59399d0 | 755 | up_read(&nilfs->ns_super_sem); |
6dd47406 RK |
756 | return NULL; |
757 | ||
758 | found: | |
759 | atomic_inc(&sbi->s_count); | |
e59399d0 | 760 | up_read(&nilfs->ns_super_sem); |
6dd47406 RK |
761 | return sbi; |
762 | } | |
763 | ||
8a9d2191 RK |
764 | int nilfs_checkpoint_is_mounted(struct the_nilfs *nilfs, __u64 cno, |
765 | int snapshot_mount) | |
766 | { | |
767 | struct nilfs_sb_info *sbi; | |
768 | int ret = 0; | |
769 | ||
e59399d0 | 770 | down_read(&nilfs->ns_super_sem); |
8a9d2191 RK |
771 | if (cno == 0 || cno > nilfs->ns_cno) |
772 | goto out_unlock; | |
773 | ||
774 | list_for_each_entry(sbi, &nilfs->ns_supers, s_list) { | |
775 | if (sbi->s_snapshot_cno == cno && | |
776 | (!snapshot_mount || nilfs_test_opt(sbi, SNAPSHOT))) { | |
777 | /* exclude read-only mounts */ | |
778 | ret++; | |
779 | break; | |
780 | } | |
781 | } | |
782 | /* for protecting recent checkpoints */ | |
783 | if (cno >= nilfs_last_cno(nilfs)) | |
784 | ret++; | |
785 | ||
786 | out_unlock: | |
e59399d0 | 787 | up_read(&nilfs->ns_super_sem); |
8a9d2191 RK |
788 | return ret; |
789 | } |