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0a8165d7 | 1 | /* |
aff063e2 JK |
2 | * fs/f2fs/super.c |
3 | * | |
4 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. | |
5 | * http://www.samsung.com/ | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/module.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/fs.h> | |
14 | #include <linux/statfs.h> | |
aff063e2 JK |
15 | #include <linux/buffer_head.h> |
16 | #include <linux/backing-dev.h> | |
17 | #include <linux/kthread.h> | |
18 | #include <linux/parser.h> | |
19 | #include <linux/mount.h> | |
20 | #include <linux/seq_file.h> | |
21 | #include <linux/random.h> | |
22 | #include <linux/exportfs.h> | |
d3ee456d | 23 | #include <linux/blkdev.h> |
aff063e2 JK |
24 | #include <linux/f2fs_fs.h> |
25 | ||
26 | #include "f2fs.h" | |
27 | #include "node.h" | |
5ec4e49f | 28 | #include "segment.h" |
aff063e2 JK |
29 | #include "xattr.h" |
30 | ||
a2a4a7e4 NJ |
31 | #define CREATE_TRACE_POINTS |
32 | #include <trace/events/f2fs.h> | |
33 | ||
aff063e2 JK |
34 | static struct kmem_cache *f2fs_inode_cachep; |
35 | ||
36 | enum { | |
37 | Opt_gc_background_off, | |
38 | Opt_disable_roll_forward, | |
39 | Opt_discard, | |
40 | Opt_noheap, | |
41 | Opt_nouser_xattr, | |
42 | Opt_noacl, | |
43 | Opt_active_logs, | |
44 | Opt_disable_ext_identify, | |
45 | Opt_err, | |
46 | }; | |
47 | ||
48 | static match_table_t f2fs_tokens = { | |
49 | {Opt_gc_background_off, "background_gc_off"}, | |
50 | {Opt_disable_roll_forward, "disable_roll_forward"}, | |
51 | {Opt_discard, "discard"}, | |
52 | {Opt_noheap, "no_heap"}, | |
53 | {Opt_nouser_xattr, "nouser_xattr"}, | |
54 | {Opt_noacl, "noacl"}, | |
55 | {Opt_active_logs, "active_logs=%u"}, | |
56 | {Opt_disable_ext_identify, "disable_ext_identify"}, | |
57 | {Opt_err, NULL}, | |
58 | }; | |
59 | ||
a07ef784 NJ |
60 | void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...) |
61 | { | |
62 | struct va_format vaf; | |
63 | va_list args; | |
64 | ||
65 | va_start(args, fmt); | |
66 | vaf.fmt = fmt; | |
67 | vaf.va = &args; | |
68 | printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf); | |
69 | va_end(args); | |
70 | } | |
71 | ||
aff063e2 JK |
72 | static void init_once(void *foo) |
73 | { | |
74 | struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo; | |
75 | ||
aff063e2 JK |
76 | inode_init_once(&fi->vfs_inode); |
77 | } | |
78 | ||
79 | static struct inode *f2fs_alloc_inode(struct super_block *sb) | |
80 | { | |
81 | struct f2fs_inode_info *fi; | |
82 | ||
83 | fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_NOFS | __GFP_ZERO); | |
84 | if (!fi) | |
85 | return NULL; | |
86 | ||
87 | init_once((void *) fi); | |
88 | ||
434720fa | 89 | /* Initialize f2fs-specific inode info */ |
aff063e2 JK |
90 | fi->vfs_inode.i_version = 1; |
91 | atomic_set(&fi->dirty_dents, 0); | |
92 | fi->i_current_depth = 1; | |
93 | fi->i_advise = 0; | |
94 | rwlock_init(&fi->ext.ext_lock); | |
95 | ||
96 | set_inode_flag(fi, FI_NEW_INODE); | |
97 | ||
98 | return &fi->vfs_inode; | |
99 | } | |
100 | ||
531ad7d5 JK |
101 | static int f2fs_drop_inode(struct inode *inode) |
102 | { | |
103 | /* | |
104 | * This is to avoid a deadlock condition like below. | |
105 | * writeback_single_inode(inode) | |
106 | * - f2fs_write_data_page | |
107 | * - f2fs_gc -> iput -> evict | |
108 | * - inode_wait_for_writeback(inode) | |
109 | */ | |
110 | if (!inode_unhashed(inode) && inode->i_state & I_SYNC) | |
111 | return 0; | |
112 | return generic_drop_inode(inode); | |
113 | } | |
114 | ||
aff063e2 JK |
115 | static void f2fs_i_callback(struct rcu_head *head) |
116 | { | |
117 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
118 | kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode)); | |
119 | } | |
120 | ||
25ca923b | 121 | static void f2fs_destroy_inode(struct inode *inode) |
aff063e2 JK |
122 | { |
123 | call_rcu(&inode->i_rcu, f2fs_i_callback); | |
124 | } | |
125 | ||
126 | static void f2fs_put_super(struct super_block *sb) | |
127 | { | |
128 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
129 | ||
130 | f2fs_destroy_stats(sbi); | |
131 | stop_gc_thread(sbi); | |
132 | ||
43727527 | 133 | write_checkpoint(sbi, true); |
aff063e2 JK |
134 | |
135 | iput(sbi->node_inode); | |
136 | iput(sbi->meta_inode); | |
137 | ||
138 | /* destroy f2fs internal modules */ | |
139 | destroy_node_manager(sbi); | |
140 | destroy_segment_manager(sbi); | |
141 | ||
142 | kfree(sbi->ckpt); | |
143 | ||
144 | sb->s_fs_info = NULL; | |
145 | brelse(sbi->raw_super_buf); | |
146 | kfree(sbi); | |
147 | } | |
148 | ||
149 | int f2fs_sync_fs(struct super_block *sb, int sync) | |
150 | { | |
151 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
aff063e2 | 152 | |
a2a4a7e4 NJ |
153 | trace_f2fs_sync_fs(sb, sync); |
154 | ||
aff063e2 JK |
155 | if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES)) |
156 | return 0; | |
157 | ||
b7473754 JK |
158 | if (sync) { |
159 | mutex_lock(&sbi->gc_mutex); | |
43727527 | 160 | write_checkpoint(sbi, false); |
b7473754 JK |
161 | mutex_unlock(&sbi->gc_mutex); |
162 | } else { | |
7d82db83 | 163 | f2fs_balance_fs(sbi); |
b7473754 | 164 | } |
aff063e2 | 165 | |
64c576fe | 166 | return 0; |
aff063e2 JK |
167 | } |
168 | ||
d6212a5f CL |
169 | static int f2fs_freeze(struct super_block *sb) |
170 | { | |
171 | int err; | |
172 | ||
77888c1e | 173 | if (f2fs_readonly(sb)) |
d6212a5f CL |
174 | return 0; |
175 | ||
176 | err = f2fs_sync_fs(sb, 1); | |
177 | return err; | |
178 | } | |
179 | ||
180 | static int f2fs_unfreeze(struct super_block *sb) | |
181 | { | |
182 | return 0; | |
183 | } | |
184 | ||
aff063e2 JK |
185 | static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf) |
186 | { | |
187 | struct super_block *sb = dentry->d_sb; | |
188 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
189 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
190 | block_t total_count, user_block_count, start_count, ovp_count; | |
191 | ||
192 | total_count = le64_to_cpu(sbi->raw_super->block_count); | |
193 | user_block_count = sbi->user_block_count; | |
194 | start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr); | |
195 | ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg; | |
196 | buf->f_type = F2FS_SUPER_MAGIC; | |
197 | buf->f_bsize = sbi->blocksize; | |
198 | ||
199 | buf->f_blocks = total_count - start_count; | |
200 | buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count; | |
201 | buf->f_bavail = user_block_count - valid_user_blocks(sbi); | |
202 | ||
1362b5e3 JK |
203 | buf->f_files = sbi->total_node_count; |
204 | buf->f_ffree = sbi->total_node_count - valid_inode_count(sbi); | |
aff063e2 | 205 | |
5a20d339 | 206 | buf->f_namelen = F2FS_NAME_LEN; |
aff063e2 JK |
207 | buf->f_fsid.val[0] = (u32)id; |
208 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
213 | static int f2fs_show_options(struct seq_file *seq, struct dentry *root) | |
214 | { | |
215 | struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb); | |
216 | ||
217 | if (test_opt(sbi, BG_GC)) | |
218 | seq_puts(seq, ",background_gc_on"); | |
219 | else | |
220 | seq_puts(seq, ",background_gc_off"); | |
221 | if (test_opt(sbi, DISABLE_ROLL_FORWARD)) | |
222 | seq_puts(seq, ",disable_roll_forward"); | |
223 | if (test_opt(sbi, DISCARD)) | |
224 | seq_puts(seq, ",discard"); | |
225 | if (test_opt(sbi, NOHEAP)) | |
226 | seq_puts(seq, ",no_heap_alloc"); | |
227 | #ifdef CONFIG_F2FS_FS_XATTR | |
228 | if (test_opt(sbi, XATTR_USER)) | |
229 | seq_puts(seq, ",user_xattr"); | |
230 | else | |
231 | seq_puts(seq, ",nouser_xattr"); | |
232 | #endif | |
233 | #ifdef CONFIG_F2FS_FS_POSIX_ACL | |
234 | if (test_opt(sbi, POSIX_ACL)) | |
235 | seq_puts(seq, ",acl"); | |
236 | else | |
237 | seq_puts(seq, ",noacl"); | |
238 | #endif | |
239 | if (test_opt(sbi, DISABLE_EXT_IDENTIFY)) | |
aa43507f | 240 | seq_puts(seq, ",disable_ext_identify"); |
aff063e2 JK |
241 | |
242 | seq_printf(seq, ",active_logs=%u", sbi->active_logs); | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
247 | static struct super_operations f2fs_sops = { | |
248 | .alloc_inode = f2fs_alloc_inode, | |
531ad7d5 | 249 | .drop_inode = f2fs_drop_inode, |
aff063e2 JK |
250 | .destroy_inode = f2fs_destroy_inode, |
251 | .write_inode = f2fs_write_inode, | |
252 | .show_options = f2fs_show_options, | |
253 | .evict_inode = f2fs_evict_inode, | |
254 | .put_super = f2fs_put_super, | |
255 | .sync_fs = f2fs_sync_fs, | |
d6212a5f CL |
256 | .freeze_fs = f2fs_freeze, |
257 | .unfreeze_fs = f2fs_unfreeze, | |
aff063e2 JK |
258 | .statfs = f2fs_statfs, |
259 | }; | |
260 | ||
261 | static struct inode *f2fs_nfs_get_inode(struct super_block *sb, | |
262 | u64 ino, u32 generation) | |
263 | { | |
264 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
265 | struct inode *inode; | |
266 | ||
267 | if (ino < F2FS_ROOT_INO(sbi)) | |
268 | return ERR_PTR(-ESTALE); | |
269 | ||
270 | /* | |
271 | * f2fs_iget isn't quite right if the inode is currently unallocated! | |
272 | * However f2fs_iget currently does appropriate checks to handle stale | |
273 | * inodes so everything is OK. | |
274 | */ | |
275 | inode = f2fs_iget(sb, ino); | |
276 | if (IS_ERR(inode)) | |
277 | return ERR_CAST(inode); | |
278 | if (generation && inode->i_generation != generation) { | |
279 | /* we didn't find the right inode.. */ | |
280 | iput(inode); | |
281 | return ERR_PTR(-ESTALE); | |
282 | } | |
283 | return inode; | |
284 | } | |
285 | ||
286 | static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
287 | int fh_len, int fh_type) | |
288 | { | |
289 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
290 | f2fs_nfs_get_inode); | |
291 | } | |
292 | ||
293 | static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid, | |
294 | int fh_len, int fh_type) | |
295 | { | |
296 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
297 | f2fs_nfs_get_inode); | |
298 | } | |
299 | ||
300 | static const struct export_operations f2fs_export_ops = { | |
301 | .fh_to_dentry = f2fs_fh_to_dentry, | |
302 | .fh_to_parent = f2fs_fh_to_parent, | |
303 | .get_parent = f2fs_get_parent, | |
304 | }; | |
305 | ||
5fb08372 | 306 | static int parse_options(struct super_block *sb, char *options) |
aff063e2 | 307 | { |
5fb08372 | 308 | struct f2fs_sb_info *sbi = F2FS_SB(sb); |
aff063e2 JK |
309 | substring_t args[MAX_OPT_ARGS]; |
310 | char *p; | |
311 | int arg = 0; | |
312 | ||
313 | if (!options) | |
314 | return 0; | |
315 | ||
316 | while ((p = strsep(&options, ",")) != NULL) { | |
317 | int token; | |
318 | if (!*p) | |
319 | continue; | |
320 | /* | |
321 | * Initialize args struct so we know whether arg was | |
322 | * found; some options take optional arguments. | |
323 | */ | |
324 | args[0].to = args[0].from = NULL; | |
325 | token = match_token(p, f2fs_tokens, args); | |
326 | ||
327 | switch (token) { | |
328 | case Opt_gc_background_off: | |
329 | clear_opt(sbi, BG_GC); | |
330 | break; | |
331 | case Opt_disable_roll_forward: | |
332 | set_opt(sbi, DISABLE_ROLL_FORWARD); | |
333 | break; | |
334 | case Opt_discard: | |
335 | set_opt(sbi, DISCARD); | |
336 | break; | |
337 | case Opt_noheap: | |
338 | set_opt(sbi, NOHEAP); | |
339 | break; | |
340 | #ifdef CONFIG_F2FS_FS_XATTR | |
341 | case Opt_nouser_xattr: | |
342 | clear_opt(sbi, XATTR_USER); | |
343 | break; | |
344 | #else | |
345 | case Opt_nouser_xattr: | |
a07ef784 NJ |
346 | f2fs_msg(sb, KERN_INFO, |
347 | "nouser_xattr options not supported"); | |
aff063e2 JK |
348 | break; |
349 | #endif | |
350 | #ifdef CONFIG_F2FS_FS_POSIX_ACL | |
351 | case Opt_noacl: | |
352 | clear_opt(sbi, POSIX_ACL); | |
353 | break; | |
354 | #else | |
355 | case Opt_noacl: | |
a07ef784 | 356 | f2fs_msg(sb, KERN_INFO, "noacl options not supported"); |
aff063e2 JK |
357 | break; |
358 | #endif | |
359 | case Opt_active_logs: | |
360 | if (args->from && match_int(args, &arg)) | |
361 | return -EINVAL; | |
12a67146 | 362 | if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE) |
aff063e2 JK |
363 | return -EINVAL; |
364 | sbi->active_logs = arg; | |
365 | break; | |
366 | case Opt_disable_ext_identify: | |
367 | set_opt(sbi, DISABLE_EXT_IDENTIFY); | |
368 | break; | |
369 | default: | |
a07ef784 NJ |
370 | f2fs_msg(sb, KERN_ERR, |
371 | "Unrecognized mount option \"%s\" or missing value", | |
372 | p); | |
aff063e2 JK |
373 | return -EINVAL; |
374 | } | |
375 | } | |
376 | return 0; | |
377 | } | |
378 | ||
379 | static loff_t max_file_size(unsigned bits) | |
380 | { | |
381 | loff_t result = ADDRS_PER_INODE; | |
382 | loff_t leaf_count = ADDRS_PER_BLOCK; | |
383 | ||
384 | /* two direct node blocks */ | |
385 | result += (leaf_count * 2); | |
386 | ||
387 | /* two indirect node blocks */ | |
388 | leaf_count *= NIDS_PER_BLOCK; | |
389 | result += (leaf_count * 2); | |
390 | ||
391 | /* one double indirect node block */ | |
392 | leaf_count *= NIDS_PER_BLOCK; | |
393 | result += leaf_count; | |
394 | ||
395 | result <<= bits; | |
396 | return result; | |
397 | } | |
398 | ||
a07ef784 NJ |
399 | static int sanity_check_raw_super(struct super_block *sb, |
400 | struct f2fs_super_block *raw_super) | |
aff063e2 JK |
401 | { |
402 | unsigned int blocksize; | |
403 | ||
a07ef784 NJ |
404 | if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) { |
405 | f2fs_msg(sb, KERN_INFO, | |
406 | "Magic Mismatch, valid(0x%x) - read(0x%x)", | |
407 | F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic)); | |
aff063e2 | 408 | return 1; |
a07ef784 | 409 | } |
aff063e2 | 410 | |
5c9b4692 | 411 | /* Currently, support only 4KB page cache size */ |
412 | if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) { | |
413 | f2fs_msg(sb, KERN_INFO, | |
14d7e9de | 414 | "Invalid page_cache_size (%lu), supports only 4KB\n", |
5c9b4692 | 415 | PAGE_CACHE_SIZE); |
416 | return 1; | |
417 | } | |
418 | ||
aff063e2 JK |
419 | /* Currently, support only 4KB block size */ |
420 | blocksize = 1 << le32_to_cpu(raw_super->log_blocksize); | |
5c9b4692 | 421 | if (blocksize != F2FS_BLKSIZE) { |
a07ef784 NJ |
422 | f2fs_msg(sb, KERN_INFO, |
423 | "Invalid blocksize (%u), supports only 4KB\n", | |
424 | blocksize); | |
aff063e2 | 425 | return 1; |
a07ef784 | 426 | } |
5c9b4692 | 427 | |
aff063e2 | 428 | if (le32_to_cpu(raw_super->log_sectorsize) != |
a07ef784 NJ |
429 | F2FS_LOG_SECTOR_SIZE) { |
430 | f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize"); | |
aff063e2 | 431 | return 1; |
a07ef784 | 432 | } |
aff063e2 | 433 | if (le32_to_cpu(raw_super->log_sectors_per_block) != |
a07ef784 NJ |
434 | F2FS_LOG_SECTORS_PER_BLOCK) { |
435 | f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block"); | |
aff063e2 | 436 | return 1; |
a07ef784 | 437 | } |
aff063e2 JK |
438 | return 0; |
439 | } | |
440 | ||
577e3495 | 441 | static int sanity_check_ckpt(struct f2fs_sb_info *sbi) |
aff063e2 JK |
442 | { |
443 | unsigned int total, fsmeta; | |
577e3495 JK |
444 | struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi); |
445 | struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi); | |
aff063e2 JK |
446 | |
447 | total = le32_to_cpu(raw_super->segment_count); | |
448 | fsmeta = le32_to_cpu(raw_super->segment_count_ckpt); | |
449 | fsmeta += le32_to_cpu(raw_super->segment_count_sit); | |
450 | fsmeta += le32_to_cpu(raw_super->segment_count_nat); | |
451 | fsmeta += le32_to_cpu(ckpt->rsvd_segment_count); | |
452 | fsmeta += le32_to_cpu(raw_super->segment_count_ssa); | |
453 | ||
454 | if (fsmeta >= total) | |
455 | return 1; | |
577e3495 JK |
456 | |
457 | if (is_set_ckpt_flags(ckpt, CP_ERROR_FLAG)) { | |
458 | f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck"); | |
459 | return 1; | |
460 | } | |
aff063e2 JK |
461 | return 0; |
462 | } | |
463 | ||
464 | static void init_sb_info(struct f2fs_sb_info *sbi) | |
465 | { | |
466 | struct f2fs_super_block *raw_super = sbi->raw_super; | |
467 | int i; | |
468 | ||
469 | sbi->log_sectors_per_block = | |
470 | le32_to_cpu(raw_super->log_sectors_per_block); | |
471 | sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize); | |
472 | sbi->blocksize = 1 << sbi->log_blocksize; | |
473 | sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg); | |
474 | sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg; | |
475 | sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec); | |
476 | sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone); | |
477 | sbi->total_sections = le32_to_cpu(raw_super->section_count); | |
478 | sbi->total_node_count = | |
479 | (le32_to_cpu(raw_super->segment_count_nat) / 2) | |
480 | * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK; | |
481 | sbi->root_ino_num = le32_to_cpu(raw_super->root_ino); | |
482 | sbi->node_ino_num = le32_to_cpu(raw_super->node_ino); | |
483 | sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino); | |
5ec4e49f | 484 | sbi->cur_victim_sec = NULL_SECNO; |
aff063e2 JK |
485 | |
486 | for (i = 0; i < NR_COUNT_TYPE; i++) | |
487 | atomic_set(&sbi->nr_pages[i], 0); | |
488 | } | |
489 | ||
14d7e9de | 490 | static int validate_superblock(struct super_block *sb, |
491 | struct f2fs_super_block **raw_super, | |
492 | struct buffer_head **raw_super_buf, sector_t block) | |
493 | { | |
494 | const char *super = (block == 0 ? "first" : "second"); | |
495 | ||
496 | /* read f2fs raw super block */ | |
497 | *raw_super_buf = sb_bread(sb, block); | |
498 | if (!*raw_super_buf) { | |
499 | f2fs_msg(sb, KERN_ERR, "unable to read %s superblock", | |
500 | super); | |
c0d39e65 | 501 | return -EIO; |
14d7e9de | 502 | } |
503 | ||
504 | *raw_super = (struct f2fs_super_block *) | |
505 | ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET); | |
506 | ||
507 | /* sanity checking of raw super */ | |
508 | if (!sanity_check_raw_super(sb, *raw_super)) | |
509 | return 0; | |
510 | ||
511 | f2fs_msg(sb, KERN_ERR, "Can't find a valid F2FS filesystem " | |
512 | "in %s superblock", super); | |
c0d39e65 | 513 | return -EINVAL; |
14d7e9de | 514 | } |
515 | ||
aff063e2 JK |
516 | static int f2fs_fill_super(struct super_block *sb, void *data, int silent) |
517 | { | |
518 | struct f2fs_sb_info *sbi; | |
519 | struct f2fs_super_block *raw_super; | |
520 | struct buffer_head *raw_super_buf; | |
521 | struct inode *root; | |
522 | long err = -EINVAL; | |
523 | int i; | |
524 | ||
525 | /* allocate memory for f2fs-specific super block info */ | |
526 | sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL); | |
527 | if (!sbi) | |
528 | return -ENOMEM; | |
529 | ||
ff9234ad | 530 | /* set a block size */ |
a07ef784 NJ |
531 | if (!sb_set_blocksize(sb, F2FS_BLKSIZE)) { |
532 | f2fs_msg(sb, KERN_ERR, "unable to set blocksize"); | |
aff063e2 | 533 | goto free_sbi; |
a07ef784 | 534 | } |
aff063e2 | 535 | |
c0d39e65 NJ |
536 | err = validate_superblock(sb, &raw_super, &raw_super_buf, 0); |
537 | if (err) { | |
14d7e9de | 538 | brelse(raw_super_buf); |
c0d39e65 NJ |
539 | /* check secondary superblock when primary failed */ |
540 | err = validate_superblock(sb, &raw_super, &raw_super_buf, 1); | |
541 | if (err) | |
14d7e9de | 542 | goto free_sb_buf; |
aff063e2 | 543 | } |
5fb08372 | 544 | sb->s_fs_info = sbi; |
aff063e2 JK |
545 | /* init some FS parameters */ |
546 | sbi->active_logs = NR_CURSEG_TYPE; | |
547 | ||
548 | set_opt(sbi, BG_GC); | |
549 | ||
550 | #ifdef CONFIG_F2FS_FS_XATTR | |
551 | set_opt(sbi, XATTR_USER); | |
552 | #endif | |
553 | #ifdef CONFIG_F2FS_FS_POSIX_ACL | |
554 | set_opt(sbi, POSIX_ACL); | |
555 | #endif | |
556 | /* parse mount options */ | |
5fb08372 | 557 | err = parse_options(sb, (char *)data); |
66348b72 | 558 | if (err) |
aff063e2 JK |
559 | goto free_sb_buf; |
560 | ||
25ca923b | 561 | sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize)); |
aff063e2 JK |
562 | sb->s_max_links = F2FS_LINK_MAX; |
563 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
564 | ||
565 | sb->s_op = &f2fs_sops; | |
566 | sb->s_xattr = f2fs_xattr_handlers; | |
567 | sb->s_export_op = &f2fs_export_ops; | |
568 | sb->s_magic = F2FS_SUPER_MAGIC; | |
aff063e2 JK |
569 | sb->s_time_gran = 1; |
570 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
571 | (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0); | |
572 | memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid)); | |
573 | ||
574 | /* init f2fs-specific super block info */ | |
575 | sbi->sb = sb; | |
576 | sbi->raw_super = raw_super; | |
577 | sbi->raw_super_buf = raw_super_buf; | |
578 | mutex_init(&sbi->gc_mutex); | |
aff063e2 JK |
579 | mutex_init(&sbi->writepages); |
580 | mutex_init(&sbi->cp_mutex); | |
39936837 | 581 | for (i = 0; i < NR_GLOBAL_LOCKS; i++) |
aff063e2 | 582 | mutex_init(&sbi->fs_lock[i]); |
39936837 | 583 | mutex_init(&sbi->node_write); |
aff063e2 JK |
584 | sbi->por_doing = 0; |
585 | spin_lock_init(&sbi->stat_lock); | |
586 | init_rwsem(&sbi->bio_sem); | |
587 | init_sb_info(sbi); | |
588 | ||
589 | /* get an inode for meta space */ | |
590 | sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi)); | |
591 | if (IS_ERR(sbi->meta_inode)) { | |
a07ef784 | 592 | f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode"); |
aff063e2 JK |
593 | err = PTR_ERR(sbi->meta_inode); |
594 | goto free_sb_buf; | |
595 | } | |
596 | ||
597 | err = get_valid_checkpoint(sbi); | |
a07ef784 NJ |
598 | if (err) { |
599 | f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint"); | |
aff063e2 | 600 | goto free_meta_inode; |
a07ef784 | 601 | } |
aff063e2 JK |
602 | |
603 | /* sanity checking of checkpoint */ | |
604 | err = -EINVAL; | |
577e3495 | 605 | if (sanity_check_ckpt(sbi)) { |
a07ef784 | 606 | f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint"); |
aff063e2 | 607 | goto free_cp; |
a07ef784 | 608 | } |
aff063e2 JK |
609 | |
610 | sbi->total_valid_node_count = | |
611 | le32_to_cpu(sbi->ckpt->valid_node_count); | |
612 | sbi->total_valid_inode_count = | |
613 | le32_to_cpu(sbi->ckpt->valid_inode_count); | |
614 | sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count); | |
615 | sbi->total_valid_block_count = | |
616 | le64_to_cpu(sbi->ckpt->valid_block_count); | |
617 | sbi->last_valid_block_count = sbi->total_valid_block_count; | |
618 | sbi->alloc_valid_block_count = 0; | |
619 | INIT_LIST_HEAD(&sbi->dir_inode_list); | |
620 | spin_lock_init(&sbi->dir_inode_lock); | |
621 | ||
aff063e2 JK |
622 | init_orphan_info(sbi); |
623 | ||
624 | /* setup f2fs internal modules */ | |
625 | err = build_segment_manager(sbi); | |
a07ef784 NJ |
626 | if (err) { |
627 | f2fs_msg(sb, KERN_ERR, | |
628 | "Failed to initialize F2FS segment manager"); | |
aff063e2 | 629 | goto free_sm; |
a07ef784 | 630 | } |
aff063e2 | 631 | err = build_node_manager(sbi); |
a07ef784 NJ |
632 | if (err) { |
633 | f2fs_msg(sb, KERN_ERR, | |
634 | "Failed to initialize F2FS node manager"); | |
aff063e2 | 635 | goto free_nm; |
a07ef784 | 636 | } |
aff063e2 JK |
637 | |
638 | build_gc_manager(sbi); | |
639 | ||
640 | /* get an inode for node space */ | |
641 | sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi)); | |
642 | if (IS_ERR(sbi->node_inode)) { | |
a07ef784 | 643 | f2fs_msg(sb, KERN_ERR, "Failed to read node inode"); |
aff063e2 JK |
644 | err = PTR_ERR(sbi->node_inode); |
645 | goto free_nm; | |
646 | } | |
647 | ||
648 | /* if there are nt orphan nodes free them */ | |
649 | err = -EINVAL; | |
30f0c758 | 650 | if (recover_orphan_inodes(sbi)) |
aff063e2 JK |
651 | goto free_node_inode; |
652 | ||
653 | /* read root inode and dentry */ | |
654 | root = f2fs_iget(sb, F2FS_ROOT_INO(sbi)); | |
655 | if (IS_ERR(root)) { | |
a07ef784 | 656 | f2fs_msg(sb, KERN_ERR, "Failed to read root inode"); |
aff063e2 JK |
657 | err = PTR_ERR(root); |
658 | goto free_node_inode; | |
659 | } | |
660 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) | |
661 | goto free_root_inode; | |
662 | ||
663 | sb->s_root = d_make_root(root); /* allocate root dentry */ | |
664 | if (!sb->s_root) { | |
665 | err = -ENOMEM; | |
666 | goto free_root_inode; | |
667 | } | |
668 | ||
669 | /* recover fsynced data */ | |
6ead1142 JK |
670 | if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) { |
671 | err = recover_fsync_data(sbi); | |
bde582b2 CF |
672 | if (err) |
673 | f2fs_msg(sb, KERN_ERR, | |
674 | "Cannot recover all fsync data errno=%ld", err); | |
6ead1142 | 675 | } |
aff063e2 JK |
676 | |
677 | /* After POR, we can run background GC thread */ | |
678 | err = start_gc_thread(sbi); | |
679 | if (err) | |
680 | goto fail; | |
681 | ||
682 | err = f2fs_build_stats(sbi); | |
683 | if (err) | |
684 | goto fail; | |
685 | ||
d3ee456d NJ |
686 | if (test_opt(sbi, DISCARD)) { |
687 | struct request_queue *q = bdev_get_queue(sb->s_bdev); | |
688 | if (!blk_queue_discard(q)) | |
689 | f2fs_msg(sb, KERN_WARNING, | |
690 | "mounting with \"discard\" option, but " | |
691 | "the device does not support discard"); | |
692 | } | |
693 | ||
aff063e2 JK |
694 | return 0; |
695 | fail: | |
696 | stop_gc_thread(sbi); | |
697 | free_root_inode: | |
698 | dput(sb->s_root); | |
699 | sb->s_root = NULL; | |
700 | free_node_inode: | |
701 | iput(sbi->node_inode); | |
702 | free_nm: | |
703 | destroy_node_manager(sbi); | |
704 | free_sm: | |
705 | destroy_segment_manager(sbi); | |
706 | free_cp: | |
707 | kfree(sbi->ckpt); | |
708 | free_meta_inode: | |
709 | make_bad_inode(sbi->meta_inode); | |
710 | iput(sbi->meta_inode); | |
711 | free_sb_buf: | |
712 | brelse(raw_super_buf); | |
713 | free_sbi: | |
714 | kfree(sbi); | |
715 | return err; | |
716 | } | |
717 | ||
718 | static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags, | |
719 | const char *dev_name, void *data) | |
720 | { | |
721 | return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super); | |
722 | } | |
723 | ||
724 | static struct file_system_type f2fs_fs_type = { | |
725 | .owner = THIS_MODULE, | |
726 | .name = "f2fs", | |
727 | .mount = f2fs_mount, | |
728 | .kill_sb = kill_block_super, | |
729 | .fs_flags = FS_REQUIRES_DEV, | |
730 | }; | |
7f78e035 | 731 | MODULE_ALIAS_FS("f2fs"); |
aff063e2 | 732 | |
6e6093a8 | 733 | static int __init init_inodecache(void) |
aff063e2 JK |
734 | { |
735 | f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache", | |
736 | sizeof(struct f2fs_inode_info), NULL); | |
737 | if (f2fs_inode_cachep == NULL) | |
738 | return -ENOMEM; | |
739 | return 0; | |
740 | } | |
741 | ||
742 | static void destroy_inodecache(void) | |
743 | { | |
744 | /* | |
745 | * Make sure all delayed rcu free inodes are flushed before we | |
746 | * destroy cache. | |
747 | */ | |
748 | rcu_barrier(); | |
749 | kmem_cache_destroy(f2fs_inode_cachep); | |
750 | } | |
751 | ||
752 | static int __init init_f2fs_fs(void) | |
753 | { | |
754 | int err; | |
755 | ||
756 | err = init_inodecache(); | |
757 | if (err) | |
758 | goto fail; | |
759 | err = create_node_manager_caches(); | |
760 | if (err) | |
761 | goto fail; | |
762 | err = create_gc_caches(); | |
763 | if (err) | |
764 | goto fail; | |
765 | err = create_checkpoint_caches(); | |
766 | if (err) | |
767 | goto fail; | |
4589d25d NJ |
768 | err = register_filesystem(&f2fs_fs_type); |
769 | if (err) | |
770 | goto fail; | |
771 | f2fs_create_root_stats(); | |
aff063e2 JK |
772 | fail: |
773 | return err; | |
774 | } | |
775 | ||
776 | static void __exit exit_f2fs_fs(void) | |
777 | { | |
4589d25d | 778 | f2fs_destroy_root_stats(); |
aff063e2 JK |
779 | unregister_filesystem(&f2fs_fs_type); |
780 | destroy_checkpoint_caches(); | |
781 | destroy_gc_caches(); | |
782 | destroy_node_manager_caches(); | |
783 | destroy_inodecache(); | |
784 | } | |
785 | ||
786 | module_init(init_f2fs_fs) | |
787 | module_exit(exit_f2fs_fs) | |
788 | ||
789 | MODULE_AUTHOR("Samsung Electronics's Praesto Team"); | |
790 | MODULE_DESCRIPTION("Flash Friendly File System"); | |
791 | MODULE_LICENSE("GPL"); |