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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> | |
15 | #include <linux/proc_fs.h> | |
16 | #include <linux/buffer_head.h> | |
17 | #include <linux/backing-dev.h> | |
18 | #include <linux/kthread.h> | |
19 | #include <linux/parser.h> | |
20 | #include <linux/mount.h> | |
21 | #include <linux/seq_file.h> | |
22 | #include <linux/random.h> | |
23 | #include <linux/exportfs.h> | |
24 | #include <linux/f2fs_fs.h> | |
25 | ||
26 | #include "f2fs.h" | |
27 | #include "node.h" | |
28 | #include "xattr.h" | |
29 | ||
30 | static struct kmem_cache *f2fs_inode_cachep; | |
31 | ||
32 | enum { | |
33 | Opt_gc_background_off, | |
34 | Opt_disable_roll_forward, | |
35 | Opt_discard, | |
36 | Opt_noheap, | |
37 | Opt_nouser_xattr, | |
38 | Opt_noacl, | |
39 | Opt_active_logs, | |
40 | Opt_disable_ext_identify, | |
41 | Opt_err, | |
42 | }; | |
43 | ||
44 | static match_table_t f2fs_tokens = { | |
45 | {Opt_gc_background_off, "background_gc_off"}, | |
46 | {Opt_disable_roll_forward, "disable_roll_forward"}, | |
47 | {Opt_discard, "discard"}, | |
48 | {Opt_noheap, "no_heap"}, | |
49 | {Opt_nouser_xattr, "nouser_xattr"}, | |
50 | {Opt_noacl, "noacl"}, | |
51 | {Opt_active_logs, "active_logs=%u"}, | |
52 | {Opt_disable_ext_identify, "disable_ext_identify"}, | |
53 | {Opt_err, NULL}, | |
54 | }; | |
55 | ||
56 | static void init_once(void *foo) | |
57 | { | |
58 | struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo; | |
59 | ||
aff063e2 JK |
60 | inode_init_once(&fi->vfs_inode); |
61 | } | |
62 | ||
63 | static struct inode *f2fs_alloc_inode(struct super_block *sb) | |
64 | { | |
65 | struct f2fs_inode_info *fi; | |
66 | ||
67 | fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_NOFS | __GFP_ZERO); | |
68 | if (!fi) | |
69 | return NULL; | |
70 | ||
71 | init_once((void *) fi); | |
72 | ||
73 | /* Initilize f2fs-specific inode info */ | |
74 | fi->vfs_inode.i_version = 1; | |
75 | atomic_set(&fi->dirty_dents, 0); | |
76 | fi->i_current_depth = 1; | |
77 | fi->i_advise = 0; | |
78 | rwlock_init(&fi->ext.ext_lock); | |
79 | ||
80 | set_inode_flag(fi, FI_NEW_INODE); | |
81 | ||
82 | return &fi->vfs_inode; | |
83 | } | |
84 | ||
85 | static void f2fs_i_callback(struct rcu_head *head) | |
86 | { | |
87 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
88 | kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode)); | |
89 | } | |
90 | ||
25ca923b | 91 | static void f2fs_destroy_inode(struct inode *inode) |
aff063e2 JK |
92 | { |
93 | call_rcu(&inode->i_rcu, f2fs_i_callback); | |
94 | } | |
95 | ||
96 | static void f2fs_put_super(struct super_block *sb) | |
97 | { | |
98 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
99 | ||
100 | f2fs_destroy_stats(sbi); | |
101 | stop_gc_thread(sbi); | |
102 | ||
103 | write_checkpoint(sbi, false, true); | |
104 | ||
105 | iput(sbi->node_inode); | |
106 | iput(sbi->meta_inode); | |
107 | ||
108 | /* destroy f2fs internal modules */ | |
109 | destroy_node_manager(sbi); | |
110 | destroy_segment_manager(sbi); | |
111 | ||
112 | kfree(sbi->ckpt); | |
113 | ||
114 | sb->s_fs_info = NULL; | |
115 | brelse(sbi->raw_super_buf); | |
116 | kfree(sbi); | |
117 | } | |
118 | ||
119 | int f2fs_sync_fs(struct super_block *sb, int sync) | |
120 | { | |
121 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
aff063e2 JK |
122 | |
123 | if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES)) | |
124 | return 0; | |
125 | ||
126 | if (sync) | |
127 | write_checkpoint(sbi, false, false); | |
128 | ||
64c576fe | 129 | return 0; |
aff063e2 JK |
130 | } |
131 | ||
132 | static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
133 | { | |
134 | struct super_block *sb = dentry->d_sb; | |
135 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
136 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
137 | block_t total_count, user_block_count, start_count, ovp_count; | |
138 | ||
139 | total_count = le64_to_cpu(sbi->raw_super->block_count); | |
140 | user_block_count = sbi->user_block_count; | |
141 | start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr); | |
142 | ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg; | |
143 | buf->f_type = F2FS_SUPER_MAGIC; | |
144 | buf->f_bsize = sbi->blocksize; | |
145 | ||
146 | buf->f_blocks = total_count - start_count; | |
147 | buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count; | |
148 | buf->f_bavail = user_block_count - valid_user_blocks(sbi); | |
149 | ||
1362b5e3 JK |
150 | buf->f_files = sbi->total_node_count; |
151 | buf->f_ffree = sbi->total_node_count - valid_inode_count(sbi); | |
aff063e2 JK |
152 | |
153 | buf->f_namelen = F2FS_MAX_NAME_LEN; | |
154 | buf->f_fsid.val[0] = (u32)id; | |
155 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | static int f2fs_show_options(struct seq_file *seq, struct dentry *root) | |
161 | { | |
162 | struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb); | |
163 | ||
164 | if (test_opt(sbi, BG_GC)) | |
165 | seq_puts(seq, ",background_gc_on"); | |
166 | else | |
167 | seq_puts(seq, ",background_gc_off"); | |
168 | if (test_opt(sbi, DISABLE_ROLL_FORWARD)) | |
169 | seq_puts(seq, ",disable_roll_forward"); | |
170 | if (test_opt(sbi, DISCARD)) | |
171 | seq_puts(seq, ",discard"); | |
172 | if (test_opt(sbi, NOHEAP)) | |
173 | seq_puts(seq, ",no_heap_alloc"); | |
174 | #ifdef CONFIG_F2FS_FS_XATTR | |
175 | if (test_opt(sbi, XATTR_USER)) | |
176 | seq_puts(seq, ",user_xattr"); | |
177 | else | |
178 | seq_puts(seq, ",nouser_xattr"); | |
179 | #endif | |
180 | #ifdef CONFIG_F2FS_FS_POSIX_ACL | |
181 | if (test_opt(sbi, POSIX_ACL)) | |
182 | seq_puts(seq, ",acl"); | |
183 | else | |
184 | seq_puts(seq, ",noacl"); | |
185 | #endif | |
186 | if (test_opt(sbi, DISABLE_EXT_IDENTIFY)) | |
187 | seq_puts(seq, ",disable_ext_indentify"); | |
188 | ||
189 | seq_printf(seq, ",active_logs=%u", sbi->active_logs); | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
194 | static struct super_operations f2fs_sops = { | |
195 | .alloc_inode = f2fs_alloc_inode, | |
196 | .destroy_inode = f2fs_destroy_inode, | |
197 | .write_inode = f2fs_write_inode, | |
198 | .show_options = f2fs_show_options, | |
199 | .evict_inode = f2fs_evict_inode, | |
200 | .put_super = f2fs_put_super, | |
201 | .sync_fs = f2fs_sync_fs, | |
202 | .statfs = f2fs_statfs, | |
203 | }; | |
204 | ||
205 | static struct inode *f2fs_nfs_get_inode(struct super_block *sb, | |
206 | u64 ino, u32 generation) | |
207 | { | |
208 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
209 | struct inode *inode; | |
210 | ||
211 | if (ino < F2FS_ROOT_INO(sbi)) | |
212 | return ERR_PTR(-ESTALE); | |
213 | ||
214 | /* | |
215 | * f2fs_iget isn't quite right if the inode is currently unallocated! | |
216 | * However f2fs_iget currently does appropriate checks to handle stale | |
217 | * inodes so everything is OK. | |
218 | */ | |
219 | inode = f2fs_iget(sb, ino); | |
220 | if (IS_ERR(inode)) | |
221 | return ERR_CAST(inode); | |
222 | if (generation && inode->i_generation != generation) { | |
223 | /* we didn't find the right inode.. */ | |
224 | iput(inode); | |
225 | return ERR_PTR(-ESTALE); | |
226 | } | |
227 | return inode; | |
228 | } | |
229 | ||
230 | static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
231 | int fh_len, int fh_type) | |
232 | { | |
233 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
234 | f2fs_nfs_get_inode); | |
235 | } | |
236 | ||
237 | static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid, | |
238 | int fh_len, int fh_type) | |
239 | { | |
240 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
241 | f2fs_nfs_get_inode); | |
242 | } | |
243 | ||
244 | static const struct export_operations f2fs_export_ops = { | |
245 | .fh_to_dentry = f2fs_fh_to_dentry, | |
246 | .fh_to_parent = f2fs_fh_to_parent, | |
247 | .get_parent = f2fs_get_parent, | |
248 | }; | |
249 | ||
250 | static int parse_options(struct f2fs_sb_info *sbi, char *options) | |
251 | { | |
252 | substring_t args[MAX_OPT_ARGS]; | |
253 | char *p; | |
254 | int arg = 0; | |
255 | ||
256 | if (!options) | |
257 | return 0; | |
258 | ||
259 | while ((p = strsep(&options, ",")) != NULL) { | |
260 | int token; | |
261 | if (!*p) | |
262 | continue; | |
263 | /* | |
264 | * Initialize args struct so we know whether arg was | |
265 | * found; some options take optional arguments. | |
266 | */ | |
267 | args[0].to = args[0].from = NULL; | |
268 | token = match_token(p, f2fs_tokens, args); | |
269 | ||
270 | switch (token) { | |
271 | case Opt_gc_background_off: | |
272 | clear_opt(sbi, BG_GC); | |
273 | break; | |
274 | case Opt_disable_roll_forward: | |
275 | set_opt(sbi, DISABLE_ROLL_FORWARD); | |
276 | break; | |
277 | case Opt_discard: | |
278 | set_opt(sbi, DISCARD); | |
279 | break; | |
280 | case Opt_noheap: | |
281 | set_opt(sbi, NOHEAP); | |
282 | break; | |
283 | #ifdef CONFIG_F2FS_FS_XATTR | |
284 | case Opt_nouser_xattr: | |
285 | clear_opt(sbi, XATTR_USER); | |
286 | break; | |
287 | #else | |
288 | case Opt_nouser_xattr: | |
289 | pr_info("nouser_xattr options not supported\n"); | |
290 | break; | |
291 | #endif | |
292 | #ifdef CONFIG_F2FS_FS_POSIX_ACL | |
293 | case Opt_noacl: | |
294 | clear_opt(sbi, POSIX_ACL); | |
295 | break; | |
296 | #else | |
297 | case Opt_noacl: | |
298 | pr_info("noacl options not supported\n"); | |
299 | break; | |
300 | #endif | |
301 | case Opt_active_logs: | |
302 | if (args->from && match_int(args, &arg)) | |
303 | return -EINVAL; | |
12a67146 | 304 | if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE) |
aff063e2 JK |
305 | return -EINVAL; |
306 | sbi->active_logs = arg; | |
307 | break; | |
308 | case Opt_disable_ext_identify: | |
309 | set_opt(sbi, DISABLE_EXT_IDENTIFY); | |
310 | break; | |
311 | default: | |
72ce6094 NJ |
312 | pr_err("Unrecognized mount option \"%s\" or missing value\n", |
313 | p); | |
aff063e2 JK |
314 | return -EINVAL; |
315 | } | |
316 | } | |
317 | return 0; | |
318 | } | |
319 | ||
320 | static loff_t max_file_size(unsigned bits) | |
321 | { | |
322 | loff_t result = ADDRS_PER_INODE; | |
323 | loff_t leaf_count = ADDRS_PER_BLOCK; | |
324 | ||
325 | /* two direct node blocks */ | |
326 | result += (leaf_count * 2); | |
327 | ||
328 | /* two indirect node blocks */ | |
329 | leaf_count *= NIDS_PER_BLOCK; | |
330 | result += (leaf_count * 2); | |
331 | ||
332 | /* one double indirect node block */ | |
333 | leaf_count *= NIDS_PER_BLOCK; | |
334 | result += leaf_count; | |
335 | ||
336 | result <<= bits; | |
337 | return result; | |
338 | } | |
339 | ||
340 | static int sanity_check_raw_super(struct f2fs_super_block *raw_super) | |
341 | { | |
342 | unsigned int blocksize; | |
343 | ||
344 | if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) | |
345 | return 1; | |
346 | ||
347 | /* Currently, support only 4KB block size */ | |
348 | blocksize = 1 << le32_to_cpu(raw_super->log_blocksize); | |
349 | if (blocksize != PAGE_CACHE_SIZE) | |
350 | return 1; | |
351 | if (le32_to_cpu(raw_super->log_sectorsize) != | |
352 | F2FS_LOG_SECTOR_SIZE) | |
353 | return 1; | |
354 | if (le32_to_cpu(raw_super->log_sectors_per_block) != | |
355 | F2FS_LOG_SECTORS_PER_BLOCK) | |
356 | return 1; | |
357 | return 0; | |
358 | } | |
359 | ||
360 | static int sanity_check_ckpt(struct f2fs_super_block *raw_super, | |
361 | struct f2fs_checkpoint *ckpt) | |
362 | { | |
363 | unsigned int total, fsmeta; | |
364 | ||
365 | total = le32_to_cpu(raw_super->segment_count); | |
366 | fsmeta = le32_to_cpu(raw_super->segment_count_ckpt); | |
367 | fsmeta += le32_to_cpu(raw_super->segment_count_sit); | |
368 | fsmeta += le32_to_cpu(raw_super->segment_count_nat); | |
369 | fsmeta += le32_to_cpu(ckpt->rsvd_segment_count); | |
370 | fsmeta += le32_to_cpu(raw_super->segment_count_ssa); | |
371 | ||
372 | if (fsmeta >= total) | |
373 | return 1; | |
374 | return 0; | |
375 | } | |
376 | ||
377 | static void init_sb_info(struct f2fs_sb_info *sbi) | |
378 | { | |
379 | struct f2fs_super_block *raw_super = sbi->raw_super; | |
380 | int i; | |
381 | ||
382 | sbi->log_sectors_per_block = | |
383 | le32_to_cpu(raw_super->log_sectors_per_block); | |
384 | sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize); | |
385 | sbi->blocksize = 1 << sbi->log_blocksize; | |
386 | sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg); | |
387 | sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg; | |
388 | sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec); | |
389 | sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone); | |
390 | sbi->total_sections = le32_to_cpu(raw_super->section_count); | |
391 | sbi->total_node_count = | |
392 | (le32_to_cpu(raw_super->segment_count_nat) / 2) | |
393 | * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK; | |
394 | sbi->root_ino_num = le32_to_cpu(raw_super->root_ino); | |
395 | sbi->node_ino_num = le32_to_cpu(raw_super->node_ino); | |
396 | sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino); | |
397 | ||
398 | for (i = 0; i < NR_COUNT_TYPE; i++) | |
399 | atomic_set(&sbi->nr_pages[i], 0); | |
400 | } | |
401 | ||
402 | static int f2fs_fill_super(struct super_block *sb, void *data, int silent) | |
403 | { | |
404 | struct f2fs_sb_info *sbi; | |
405 | struct f2fs_super_block *raw_super; | |
406 | struct buffer_head *raw_super_buf; | |
407 | struct inode *root; | |
408 | long err = -EINVAL; | |
409 | int i; | |
410 | ||
411 | /* allocate memory for f2fs-specific super block info */ | |
412 | sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL); | |
413 | if (!sbi) | |
414 | return -ENOMEM; | |
415 | ||
416 | /* set a temporary block size */ | |
417 | if (!sb_set_blocksize(sb, F2FS_BLKSIZE)) | |
418 | goto free_sbi; | |
419 | ||
420 | /* read f2fs raw super block */ | |
421 | raw_super_buf = sb_bread(sb, 0); | |
422 | if (!raw_super_buf) { | |
423 | err = -EIO; | |
424 | goto free_sbi; | |
425 | } | |
426 | raw_super = (struct f2fs_super_block *) | |
427 | ((char *)raw_super_buf->b_data + F2FS_SUPER_OFFSET); | |
428 | ||
429 | /* init some FS parameters */ | |
430 | sbi->active_logs = NR_CURSEG_TYPE; | |
431 | ||
432 | set_opt(sbi, BG_GC); | |
433 | ||
434 | #ifdef CONFIG_F2FS_FS_XATTR | |
435 | set_opt(sbi, XATTR_USER); | |
436 | #endif | |
437 | #ifdef CONFIG_F2FS_FS_POSIX_ACL | |
438 | set_opt(sbi, POSIX_ACL); | |
439 | #endif | |
440 | /* parse mount options */ | |
441 | if (parse_options(sbi, (char *)data)) | |
442 | goto free_sb_buf; | |
443 | ||
444 | /* sanity checking of raw super */ | |
445 | if (sanity_check_raw_super(raw_super)) | |
446 | goto free_sb_buf; | |
447 | ||
25ca923b | 448 | sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize)); |
aff063e2 JK |
449 | sb->s_max_links = F2FS_LINK_MAX; |
450 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
451 | ||
452 | sb->s_op = &f2fs_sops; | |
453 | sb->s_xattr = f2fs_xattr_handlers; | |
454 | sb->s_export_op = &f2fs_export_ops; | |
455 | sb->s_magic = F2FS_SUPER_MAGIC; | |
456 | sb->s_fs_info = sbi; | |
457 | sb->s_time_gran = 1; | |
458 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
459 | (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0); | |
460 | memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid)); | |
461 | ||
462 | /* init f2fs-specific super block info */ | |
463 | sbi->sb = sb; | |
464 | sbi->raw_super = raw_super; | |
465 | sbi->raw_super_buf = raw_super_buf; | |
466 | mutex_init(&sbi->gc_mutex); | |
467 | mutex_init(&sbi->write_inode); | |
468 | mutex_init(&sbi->writepages); | |
469 | mutex_init(&sbi->cp_mutex); | |
470 | for (i = 0; i < NR_LOCK_TYPE; i++) | |
471 | mutex_init(&sbi->fs_lock[i]); | |
472 | sbi->por_doing = 0; | |
473 | spin_lock_init(&sbi->stat_lock); | |
474 | init_rwsem(&sbi->bio_sem); | |
475 | init_sb_info(sbi); | |
476 | ||
477 | /* get an inode for meta space */ | |
478 | sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi)); | |
479 | if (IS_ERR(sbi->meta_inode)) { | |
480 | err = PTR_ERR(sbi->meta_inode); | |
481 | goto free_sb_buf; | |
482 | } | |
483 | ||
484 | err = get_valid_checkpoint(sbi); | |
485 | if (err) | |
486 | goto free_meta_inode; | |
487 | ||
488 | /* sanity checking of checkpoint */ | |
489 | err = -EINVAL; | |
490 | if (sanity_check_ckpt(raw_super, sbi->ckpt)) | |
491 | goto free_cp; | |
492 | ||
493 | sbi->total_valid_node_count = | |
494 | le32_to_cpu(sbi->ckpt->valid_node_count); | |
495 | sbi->total_valid_inode_count = | |
496 | le32_to_cpu(sbi->ckpt->valid_inode_count); | |
497 | sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count); | |
498 | sbi->total_valid_block_count = | |
499 | le64_to_cpu(sbi->ckpt->valid_block_count); | |
500 | sbi->last_valid_block_count = sbi->total_valid_block_count; | |
501 | sbi->alloc_valid_block_count = 0; | |
502 | INIT_LIST_HEAD(&sbi->dir_inode_list); | |
503 | spin_lock_init(&sbi->dir_inode_lock); | |
504 | ||
505 | /* init super block */ | |
506 | if (!sb_set_blocksize(sb, sbi->blocksize)) | |
507 | goto free_cp; | |
508 | ||
509 | init_orphan_info(sbi); | |
510 | ||
511 | /* setup f2fs internal modules */ | |
512 | err = build_segment_manager(sbi); | |
513 | if (err) | |
514 | goto free_sm; | |
515 | err = build_node_manager(sbi); | |
516 | if (err) | |
517 | goto free_nm; | |
518 | ||
519 | build_gc_manager(sbi); | |
520 | ||
521 | /* get an inode for node space */ | |
522 | sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi)); | |
523 | if (IS_ERR(sbi->node_inode)) { | |
524 | err = PTR_ERR(sbi->node_inode); | |
525 | goto free_nm; | |
526 | } | |
527 | ||
528 | /* if there are nt orphan nodes free them */ | |
529 | err = -EINVAL; | |
30f0c758 | 530 | if (recover_orphan_inodes(sbi)) |
aff063e2 JK |
531 | goto free_node_inode; |
532 | ||
533 | /* read root inode and dentry */ | |
534 | root = f2fs_iget(sb, F2FS_ROOT_INO(sbi)); | |
535 | if (IS_ERR(root)) { | |
536 | err = PTR_ERR(root); | |
537 | goto free_node_inode; | |
538 | } | |
539 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) | |
540 | goto free_root_inode; | |
541 | ||
542 | sb->s_root = d_make_root(root); /* allocate root dentry */ | |
543 | if (!sb->s_root) { | |
544 | err = -ENOMEM; | |
545 | goto free_root_inode; | |
546 | } | |
547 | ||
548 | /* recover fsynced data */ | |
30f0c758 | 549 | if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) |
aff063e2 JK |
550 | recover_fsync_data(sbi); |
551 | ||
552 | /* After POR, we can run background GC thread */ | |
553 | err = start_gc_thread(sbi); | |
554 | if (err) | |
555 | goto fail; | |
556 | ||
557 | err = f2fs_build_stats(sbi); | |
558 | if (err) | |
559 | goto fail; | |
560 | ||
561 | return 0; | |
562 | fail: | |
563 | stop_gc_thread(sbi); | |
564 | free_root_inode: | |
565 | dput(sb->s_root); | |
566 | sb->s_root = NULL; | |
567 | free_node_inode: | |
568 | iput(sbi->node_inode); | |
569 | free_nm: | |
570 | destroy_node_manager(sbi); | |
571 | free_sm: | |
572 | destroy_segment_manager(sbi); | |
573 | free_cp: | |
574 | kfree(sbi->ckpt); | |
575 | free_meta_inode: | |
576 | make_bad_inode(sbi->meta_inode); | |
577 | iput(sbi->meta_inode); | |
578 | free_sb_buf: | |
579 | brelse(raw_super_buf); | |
580 | free_sbi: | |
581 | kfree(sbi); | |
582 | return err; | |
583 | } | |
584 | ||
585 | static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags, | |
586 | const char *dev_name, void *data) | |
587 | { | |
588 | return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super); | |
589 | } | |
590 | ||
591 | static struct file_system_type f2fs_fs_type = { | |
592 | .owner = THIS_MODULE, | |
593 | .name = "f2fs", | |
594 | .mount = f2fs_mount, | |
595 | .kill_sb = kill_block_super, | |
596 | .fs_flags = FS_REQUIRES_DEV, | |
597 | }; | |
598 | ||
599 | static int init_inodecache(void) | |
600 | { | |
601 | f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache", | |
602 | sizeof(struct f2fs_inode_info), NULL); | |
603 | if (f2fs_inode_cachep == NULL) | |
604 | return -ENOMEM; | |
605 | return 0; | |
606 | } | |
607 | ||
608 | static void destroy_inodecache(void) | |
609 | { | |
610 | /* | |
611 | * Make sure all delayed rcu free inodes are flushed before we | |
612 | * destroy cache. | |
613 | */ | |
614 | rcu_barrier(); | |
615 | kmem_cache_destroy(f2fs_inode_cachep); | |
616 | } | |
617 | ||
618 | static int __init init_f2fs_fs(void) | |
619 | { | |
620 | int err; | |
621 | ||
622 | err = init_inodecache(); | |
623 | if (err) | |
624 | goto fail; | |
625 | err = create_node_manager_caches(); | |
626 | if (err) | |
627 | goto fail; | |
628 | err = create_gc_caches(); | |
629 | if (err) | |
630 | goto fail; | |
631 | err = create_checkpoint_caches(); | |
632 | if (err) | |
633 | goto fail; | |
634 | return register_filesystem(&f2fs_fs_type); | |
635 | fail: | |
636 | return err; | |
637 | } | |
638 | ||
639 | static void __exit exit_f2fs_fs(void) | |
640 | { | |
641 | destroy_root_stats(); | |
642 | unregister_filesystem(&f2fs_fs_type); | |
643 | destroy_checkpoint_caches(); | |
644 | destroy_gc_caches(); | |
645 | destroy_node_manager_caches(); | |
646 | destroy_inodecache(); | |
647 | } | |
648 | ||
649 | module_init(init_f2fs_fs) | |
650 | module_exit(exit_f2fs_fs) | |
651 | ||
652 | MODULE_AUTHOR("Samsung Electronics's Praesto Team"); | |
653 | MODULE_DESCRIPTION("Flash Friendly File System"); | |
654 | MODULE_LICENSE("GPL"); |