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Linux 4.2.1
[linux/fpc-iii.git] / fs / f2fs / super.c
bloba06b0b46fe6952de875dc36b0c4e90c0ce980c31
1 /*
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/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/proc_fs.h>
22 #include <linux/random.h>
23 #include <linux/exportfs.h>
24 #include <linux/blkdev.h>
25 #include <linux/f2fs_fs.h>
26 #include <linux/sysfs.h>
27
28 #include "f2fs.h"
29 #include "node.h"
30 #include "segment.h"
31 #include "xattr.h"
32 #include "gc.h"
33 #include "trace.h"
34
35 #define CREATE_TRACE_POINTS
36 #include <trace/events/f2fs.h>
37
38 static struct proc_dir_entry *f2fs_proc_root;
39 static struct kmem_cache *f2fs_inode_cachep;
40 static struct kset *f2fs_kset;
41
42 enum {
43 Opt_gc_background,
44 Opt_disable_roll_forward,
45 Opt_norecovery,
46 Opt_discard,
47 Opt_noheap,
48 Opt_user_xattr,
49 Opt_nouser_xattr,
50 Opt_acl,
51 Opt_noacl,
52 Opt_active_logs,
53 Opt_disable_ext_identify,
54 Opt_inline_xattr,
55 Opt_inline_data,
56 Opt_inline_dentry,
57 Opt_flush_merge,
58 Opt_nobarrier,
59 Opt_fastboot,
60 Opt_extent_cache,
61 Opt_noinline_data,
62 Opt_err,
63 };
64
65 static match_table_t f2fs_tokens = {
66 {Opt_gc_background, "background_gc=%s"},
67 {Opt_disable_roll_forward, "disable_roll_forward"},
68 {Opt_norecovery, "norecovery"},
69 {Opt_discard, "discard"},
70 {Opt_noheap, "no_heap"},
71 {Opt_user_xattr, "user_xattr"},
72 {Opt_nouser_xattr, "nouser_xattr"},
73 {Opt_acl, "acl"},
74 {Opt_noacl, "noacl"},
75 {Opt_active_logs, "active_logs=%u"},
76 {Opt_disable_ext_identify, "disable_ext_identify"},
77 {Opt_inline_xattr, "inline_xattr"},
78 {Opt_inline_data, "inline_data"},
79 {Opt_inline_dentry, "inline_dentry"},
80 {Opt_flush_merge, "flush_merge"},
81 {Opt_nobarrier, "nobarrier"},
82 {Opt_fastboot, "fastboot"},
83 {Opt_extent_cache, "extent_cache"},
84 {Opt_noinline_data, "noinline_data"},
85 {Opt_err, NULL},
86 };
87
88 /* Sysfs support for f2fs */
89 enum {
90 GC_THREAD, /* struct f2fs_gc_thread */
91 SM_INFO, /* struct f2fs_sm_info */
92 NM_INFO, /* struct f2fs_nm_info */
93 F2FS_SBI, /* struct f2fs_sb_info */
94 };
95
96 struct f2fs_attr {
97 struct attribute attr;
98 ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
99 ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
100 const char *, size_t);
101 int struct_type;
102 int offset;
103 };
104
105 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
106 {
107 if (struct_type == GC_THREAD)
108 return (unsigned char *)sbi->gc_thread;
109 else if (struct_type == SM_INFO)
110 return (unsigned char *)SM_I(sbi);
111 else if (struct_type == NM_INFO)
112 return (unsigned char *)NM_I(sbi);
113 else if (struct_type == F2FS_SBI)
114 return (unsigned char *)sbi;
115 return NULL;
116 }
117
118 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
119 struct f2fs_sb_info *sbi, char *buf)
120 {
121 unsigned char *ptr = NULL;
122 unsigned int *ui;
123
124 ptr = __struct_ptr(sbi, a->struct_type);
125 if (!ptr)
126 return -EINVAL;
127
128 ui = (unsigned int *)(ptr + a->offset);
129
130 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
131 }
132
133 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
134 struct f2fs_sb_info *sbi,
135 const char *buf, size_t count)
136 {
137 unsigned char *ptr;
138 unsigned long t;
139 unsigned int *ui;
140 ssize_t ret;
141
142 ptr = __struct_ptr(sbi, a->struct_type);
143 if (!ptr)
144 return -EINVAL;
145
146 ui = (unsigned int *)(ptr + a->offset);
147
148 ret = kstrtoul(skip_spaces(buf), 0, &t);
149 if (ret < 0)
150 return ret;
151 *ui = t;
152 return count;
153 }
154
155 static ssize_t f2fs_attr_show(struct kobject *kobj,
156 struct attribute *attr, char *buf)
157 {
158 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
159 s_kobj);
160 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
161
162 return a->show ? a->show(a, sbi, buf) : 0;
163 }
164
165 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
166 const char *buf, size_t len)
167 {
168 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
169 s_kobj);
170 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
171
172 return a->store ? a->store(a, sbi, buf, len) : 0;
173 }
174
175 static void f2fs_sb_release(struct kobject *kobj)
176 {
177 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
178 s_kobj);
179 complete(&sbi->s_kobj_unregister);
180 }
181
182 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
183 static struct f2fs_attr f2fs_attr_##_name = { \
184 .attr = {.name = __stringify(_name), .mode = _mode }, \
185 .show = _show, \
186 .store = _store, \
187 .struct_type = _struct_type, \
188 .offset = _offset \
189 }
190
191 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \
192 F2FS_ATTR_OFFSET(struct_type, name, 0644, \
193 f2fs_sbi_show, f2fs_sbi_store, \
194 offsetof(struct struct_name, elname))
195
196 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
197 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
198 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
199 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
200 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
201 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
202 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
203 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
204 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
205 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
206 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
207 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
208 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
209
210 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
211 static struct attribute *f2fs_attrs[] = {
212 ATTR_LIST(gc_min_sleep_time),
213 ATTR_LIST(gc_max_sleep_time),
214 ATTR_LIST(gc_no_gc_sleep_time),
215 ATTR_LIST(gc_idle),
216 ATTR_LIST(reclaim_segments),
217 ATTR_LIST(max_small_discards),
218 ATTR_LIST(batched_trim_sections),
219 ATTR_LIST(ipu_policy),
220 ATTR_LIST(min_ipu_util),
221 ATTR_LIST(min_fsync_blocks),
222 ATTR_LIST(max_victim_search),
223 ATTR_LIST(dir_level),
224 ATTR_LIST(ram_thresh),
225 NULL,
226 };
227
228 static const struct sysfs_ops f2fs_attr_ops = {
229 .show = f2fs_attr_show,
230 .store = f2fs_attr_store,
231 };
232
233 static struct kobj_type f2fs_ktype = {
234 .default_attrs = f2fs_attrs,
235 .sysfs_ops = &f2fs_attr_ops,
236 .release = f2fs_sb_release,
237 };
238
239 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
240 {
241 struct va_format vaf;
242 va_list args;
243
244 va_start(args, fmt);
245 vaf.fmt = fmt;
246 vaf.va = &args;
247 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
248 va_end(args);
249 }
250
251 static void init_once(void *foo)
252 {
253 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
254
255 inode_init_once(&fi->vfs_inode);
256 }
257
258 static int parse_options(struct super_block *sb, char *options)
259 {
260 struct f2fs_sb_info *sbi = F2FS_SB(sb);
261 struct request_queue *q;
262 substring_t args[MAX_OPT_ARGS];
263 char *p, *name;
264 int arg = 0;
265
266 if (!options)
267 return 0;
268
269 while ((p = strsep(&options, ",")) != NULL) {
270 int token;
271 if (!*p)
272 continue;
273 /*
274 * Initialize args struct so we know whether arg was
275 * found; some options take optional arguments.
276 */
277 args[0].to = args[0].from = NULL;
278 token = match_token(p, f2fs_tokens, args);
279
280 switch (token) {
281 case Opt_gc_background:
282 name = match_strdup(&args[0]);
283
284 if (!name)
285 return -ENOMEM;
286 if (strlen(name) == 2 && !strncmp(name, "on", 2))
287 set_opt(sbi, BG_GC);
288 else if (strlen(name) == 3 && !strncmp(name, "off", 3))
289 clear_opt(sbi, BG_GC);
290 else {
291 kfree(name);
292 return -EINVAL;
293 }
294 kfree(name);
295 break;
296 case Opt_disable_roll_forward:
297 set_opt(sbi, DISABLE_ROLL_FORWARD);
298 break;
299 case Opt_norecovery:
300 /* this option mounts f2fs with ro */
301 set_opt(sbi, DISABLE_ROLL_FORWARD);
302 if (!f2fs_readonly(sb))
303 return -EINVAL;
304 break;
305 case Opt_discard:
306 q = bdev_get_queue(sb->s_bdev);
307 if (blk_queue_discard(q)) {
308 set_opt(sbi, DISCARD);
309 } else {
310 f2fs_msg(sb, KERN_WARNING,
311 "mounting with \"discard\" option, but "
312 "the device does not support discard");
313 }
314 break;
315 case Opt_noheap:
316 set_opt(sbi, NOHEAP);
317 break;
318 #ifdef CONFIG_F2FS_FS_XATTR
319 case Opt_user_xattr:
320 set_opt(sbi, XATTR_USER);
321 break;
322 case Opt_nouser_xattr:
323 clear_opt(sbi, XATTR_USER);
324 break;
325 case Opt_inline_xattr:
326 set_opt(sbi, INLINE_XATTR);
327 break;
328 #else
329 case Opt_user_xattr:
330 f2fs_msg(sb, KERN_INFO,
331 "user_xattr options not supported");
332 break;
333 case Opt_nouser_xattr:
334 f2fs_msg(sb, KERN_INFO,
335 "nouser_xattr options not supported");
336 break;
337 case Opt_inline_xattr:
338 f2fs_msg(sb, KERN_INFO,
339 "inline_xattr options not supported");
340 break;
341 #endif
342 #ifdef CONFIG_F2FS_FS_POSIX_ACL
343 case Opt_acl:
344 set_opt(sbi, POSIX_ACL);
345 break;
346 case Opt_noacl:
347 clear_opt(sbi, POSIX_ACL);
348 break;
349 #else
350 case Opt_acl:
351 f2fs_msg(sb, KERN_INFO, "acl options not supported");
352 break;
353 case Opt_noacl:
354 f2fs_msg(sb, KERN_INFO, "noacl options not supported");
355 break;
356 #endif
357 case Opt_active_logs:
358 if (args->from && match_int(args, &arg))
359 return -EINVAL;
360 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
361 return -EINVAL;
362 sbi->active_logs = arg;
363 break;
364 case Opt_disable_ext_identify:
365 set_opt(sbi, DISABLE_EXT_IDENTIFY);
366 break;
367 case Opt_inline_data:
368 set_opt(sbi, INLINE_DATA);
369 break;
370 case Opt_inline_dentry:
371 set_opt(sbi, INLINE_DENTRY);
372 break;
373 case Opt_flush_merge:
374 set_opt(sbi, FLUSH_MERGE);
375 break;
376 case Opt_nobarrier:
377 set_opt(sbi, NOBARRIER);
378 break;
379 case Opt_fastboot:
380 set_opt(sbi, FASTBOOT);
381 break;
382 case Opt_extent_cache:
383 set_opt(sbi, EXTENT_CACHE);
384 break;
385 case Opt_noinline_data:
386 clear_opt(sbi, INLINE_DATA);
387 break;
388 default:
389 f2fs_msg(sb, KERN_ERR,
390 "Unrecognized mount option \"%s\" or missing value",
391 p);
392 return -EINVAL;
393 }
394 }
395 return 0;
396 }
397
398 static struct inode *f2fs_alloc_inode(struct super_block *sb)
399 {
400 struct f2fs_inode_info *fi;
401
402 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
403 if (!fi)
404 return NULL;
405
406 init_once((void *) fi);
407
408 /* Initialize f2fs-specific inode info */
409 fi->vfs_inode.i_version = 1;
410 atomic_set(&fi->dirty_pages, 0);
411 fi->i_current_depth = 1;
412 fi->i_advise = 0;
413 rwlock_init(&fi->ext_lock);
414 init_rwsem(&fi->i_sem);
415 INIT_RADIX_TREE(&fi->inmem_root, GFP_NOFS);
416 INIT_LIST_HEAD(&fi->inmem_pages);
417 mutex_init(&fi->inmem_lock);
418
419 set_inode_flag(fi, FI_NEW_INODE);
420
421 if (test_opt(F2FS_SB(sb), INLINE_XATTR))
422 set_inode_flag(fi, FI_INLINE_XATTR);
423
424 /* Will be used by directory only */
425 fi->i_dir_level = F2FS_SB(sb)->dir_level;
426
427 #ifdef CONFIG_F2FS_FS_ENCRYPTION
428 fi->i_crypt_info = NULL;
429 #endif
430 return &fi->vfs_inode;
431 }
432
433 static int f2fs_drop_inode(struct inode *inode)
434 {
435 /*
436 * This is to avoid a deadlock condition like below.
437 * writeback_single_inode(inode)
438 * - f2fs_write_data_page
439 * - f2fs_gc -> iput -> evict
440 * - inode_wait_for_writeback(inode)
441 */
442 if (!inode_unhashed(inode) && inode->i_state & I_SYNC) {
443 if (!inode->i_nlink && !is_bad_inode(inode)) {
444 spin_unlock(&inode->i_lock);
445
446 /* some remained atomic pages should discarded */
447 if (f2fs_is_atomic_file(inode))
448 commit_inmem_pages(inode, true);
449
450 sb_start_intwrite(inode->i_sb);
451 i_size_write(inode, 0);
452
453 if (F2FS_HAS_BLOCKS(inode))
454 f2fs_truncate(inode);
455
456 sb_end_intwrite(inode->i_sb);
457
458 #ifdef CONFIG_F2FS_FS_ENCRYPTION
459 if (F2FS_I(inode)->i_crypt_info)
460 f2fs_free_encryption_info(inode,
461 F2FS_I(inode)->i_crypt_info);
462 #endif
463 spin_lock(&inode->i_lock);
464 }
465 return 0;
466 }
467 return generic_drop_inode(inode);
468 }
469
470 /*
471 * f2fs_dirty_inode() is called from __mark_inode_dirty()
472 *
473 * We should call set_dirty_inode to write the dirty inode through write_inode.
474 */
475 static void f2fs_dirty_inode(struct inode *inode, int flags)
476 {
477 set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
478 }
479
480 static void f2fs_i_callback(struct rcu_head *head)
481 {
482 struct inode *inode = container_of(head, struct inode, i_rcu);
483 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
484 }
485
486 static void f2fs_destroy_inode(struct inode *inode)
487 {
488 call_rcu(&inode->i_rcu, f2fs_i_callback);
489 }
490
491 static void f2fs_put_super(struct super_block *sb)
492 {
493 struct f2fs_sb_info *sbi = F2FS_SB(sb);
494
495 if (sbi->s_proc) {
496 remove_proc_entry("segment_info", sbi->s_proc);
497 remove_proc_entry(sb->s_id, f2fs_proc_root);
498 }
499 kobject_del(&sbi->s_kobj);
500
501 f2fs_destroy_stats(sbi);
502 stop_gc_thread(sbi);
503
504 /*
505 * We don't need to do checkpoint when superblock is clean.
506 * But, the previous checkpoint was not done by umount, it needs to do
507 * clean checkpoint again.
508 */
509 if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
510 !is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) {
511 struct cp_control cpc = {
512 .reason = CP_UMOUNT,
513 };
514 write_checkpoint(sbi, &cpc);
515 }
516
517 /*
518 * normally superblock is clean, so we need to release this.
519 * In addition, EIO will skip do checkpoint, we need this as well.
520 */
521 release_dirty_inode(sbi);
522 release_discard_addrs(sbi);
523
524 iput(sbi->node_inode);
525 iput(sbi->meta_inode);
526
527 /* destroy f2fs internal modules */
528 destroy_node_manager(sbi);
529 destroy_segment_manager(sbi);
530
531 kfree(sbi->ckpt);
532 kobject_put(&sbi->s_kobj);
533 wait_for_completion(&sbi->s_kobj_unregister);
534
535 sb->s_fs_info = NULL;
536 brelse(sbi->raw_super_buf);
537 kfree(sbi);
538 }
539
540 int f2fs_sync_fs(struct super_block *sb, int sync)
541 {
542 struct f2fs_sb_info *sbi = F2FS_SB(sb);
543
544 trace_f2fs_sync_fs(sb, sync);
545
546 if (sync) {
547 struct cp_control cpc;
548
549 cpc.reason = __get_cp_reason(sbi);
550
551 mutex_lock(&sbi->gc_mutex);
552 write_checkpoint(sbi, &cpc);
553 mutex_unlock(&sbi->gc_mutex);
554 } else {
555 f2fs_balance_fs(sbi);
556 }
557 f2fs_trace_ios(NULL, 1);
558
559 return 0;
560 }
561
562 static int f2fs_freeze(struct super_block *sb)
563 {
564 int err;
565
566 if (f2fs_readonly(sb))
567 return 0;
568
569 err = f2fs_sync_fs(sb, 1);
570 return err;
571 }
572
573 static int f2fs_unfreeze(struct super_block *sb)
574 {
575 return 0;
576 }
577
578 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
579 {
580 struct super_block *sb = dentry->d_sb;
581 struct f2fs_sb_info *sbi = F2FS_SB(sb);
582 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
583 block_t total_count, user_block_count, start_count, ovp_count;
584
585 total_count = le64_to_cpu(sbi->raw_super->block_count);
586 user_block_count = sbi->user_block_count;
587 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
588 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
589 buf->f_type = F2FS_SUPER_MAGIC;
590 buf->f_bsize = sbi->blocksize;
591
592 buf->f_blocks = total_count - start_count;
593 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
594 buf->f_bavail = user_block_count - valid_user_blocks(sbi);
595
596 buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
597 buf->f_ffree = buf->f_files - valid_inode_count(sbi);
598
599 buf->f_namelen = F2FS_NAME_LEN;
600 buf->f_fsid.val[0] = (u32)id;
601 buf->f_fsid.val[1] = (u32)(id >> 32);
602
603 return 0;
604 }
605
606 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
607 {
608 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
609
610 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC))
611 seq_printf(seq, ",background_gc=%s", "on");
612 else
613 seq_printf(seq, ",background_gc=%s", "off");
614 if (test_opt(sbi, DISABLE_ROLL_FORWARD))
615 seq_puts(seq, ",disable_roll_forward");
616 if (test_opt(sbi, DISCARD))
617 seq_puts(seq, ",discard");
618 if (test_opt(sbi, NOHEAP))
619 seq_puts(seq, ",no_heap_alloc");
620 #ifdef CONFIG_F2FS_FS_XATTR
621 if (test_opt(sbi, XATTR_USER))
622 seq_puts(seq, ",user_xattr");
623 else
624 seq_puts(seq, ",nouser_xattr");
625 if (test_opt(sbi, INLINE_XATTR))
626 seq_puts(seq, ",inline_xattr");
627 #endif
628 #ifdef CONFIG_F2FS_FS_POSIX_ACL
629 if (test_opt(sbi, POSIX_ACL))
630 seq_puts(seq, ",acl");
631 else
632 seq_puts(seq, ",noacl");
633 #endif
634 if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
635 seq_puts(seq, ",disable_ext_identify");
636 if (test_opt(sbi, INLINE_DATA))
637 seq_puts(seq, ",inline_data");
638 else
639 seq_puts(seq, ",noinline_data");
640 if (test_opt(sbi, INLINE_DENTRY))
641 seq_puts(seq, ",inline_dentry");
642 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
643 seq_puts(seq, ",flush_merge");
644 if (test_opt(sbi, NOBARRIER))
645 seq_puts(seq, ",nobarrier");
646 if (test_opt(sbi, FASTBOOT))
647 seq_puts(seq, ",fastboot");
648 if (test_opt(sbi, EXTENT_CACHE))
649 seq_puts(seq, ",extent_cache");
650 seq_printf(seq, ",active_logs=%u", sbi->active_logs);
651
652 return 0;
653 }
654
655 static int segment_info_seq_show(struct seq_file *seq, void *offset)
656 {
657 struct super_block *sb = seq->private;
658 struct f2fs_sb_info *sbi = F2FS_SB(sb);
659 unsigned int total_segs =
660 le32_to_cpu(sbi->raw_super->segment_count_main);
661 int i;
662
663 seq_puts(seq, "format: segment_type|valid_blocks\n"
664 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
665
666 for (i = 0; i < total_segs; i++) {
667 struct seg_entry *se = get_seg_entry(sbi, i);
668
669 if ((i % 10) == 0)
670 seq_printf(seq, "%-5d", i);
671 seq_printf(seq, "%d|%-3u", se->type,
672 get_valid_blocks(sbi, i, 1));
673 if ((i % 10) == 9 || i == (total_segs - 1))
674 seq_putc(seq, '\n');
675 else
676 seq_putc(seq, ' ');
677 }
678
679 return 0;
680 }
681
682 static int segment_info_open_fs(struct inode *inode, struct file *file)
683 {
684 return single_open(file, segment_info_seq_show, PDE_DATA(inode));
685 }
686
687 static const struct file_operations f2fs_seq_segment_info_fops = {
688 .owner = THIS_MODULE,
689 .open = segment_info_open_fs,
690 .read = seq_read,
691 .llseek = seq_lseek,
692 .release = single_release,
693 };
694
695 static void default_options(struct f2fs_sb_info *sbi)
696 {
697 /* init some FS parameters */
698 sbi->active_logs = NR_CURSEG_TYPE;
699
700 set_opt(sbi, BG_GC);
701 set_opt(sbi, INLINE_DATA);
702
703 #ifdef CONFIG_F2FS_FS_XATTR
704 set_opt(sbi, XATTR_USER);
705 #endif
706 #ifdef CONFIG_F2FS_FS_POSIX_ACL
707 set_opt(sbi, POSIX_ACL);
708 #endif
709 }
710
711 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
712 {
713 struct f2fs_sb_info *sbi = F2FS_SB(sb);
714 struct f2fs_mount_info org_mount_opt;
715 int err, active_logs;
716 bool need_restart_gc = false;
717 bool need_stop_gc = false;
718
719 sync_filesystem(sb);
720
721 /*
722 * Save the old mount options in case we
723 * need to restore them.
724 */
725 org_mount_opt = sbi->mount_opt;
726 active_logs = sbi->active_logs;
727
728 sbi->mount_opt.opt = 0;
729 default_options(sbi);
730
731 /* parse mount options */
732 err = parse_options(sb, data);
733 if (err)
734 goto restore_opts;
735
736 /*
737 * Previous and new state of filesystem is RO,
738 * so skip checking GC and FLUSH_MERGE conditions.
739 */
740 if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
741 goto skip;
742
743 /*
744 * We stop the GC thread if FS is mounted as RO
745 * or if background_gc = off is passed in mount
746 * option. Also sync the filesystem.
747 */
748 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
749 if (sbi->gc_thread) {
750 stop_gc_thread(sbi);
751 f2fs_sync_fs(sb, 1);
752 need_restart_gc = true;
753 }
754 } else if (!sbi->gc_thread) {
755 err = start_gc_thread(sbi);
756 if (err)
757 goto restore_opts;
758 need_stop_gc = true;
759 }
760
761 /*
762 * We stop issue flush thread if FS is mounted as RO
763 * or if flush_merge is not passed in mount option.
764 */
765 if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
766 destroy_flush_cmd_control(sbi);
767 } else if (!SM_I(sbi)->cmd_control_info) {
768 err = create_flush_cmd_control(sbi);
769 if (err)
770 goto restore_gc;
771 }
772 skip:
773 /* Update the POSIXACL Flag */
774 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
775 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
776 return 0;
777 restore_gc:
778 if (need_restart_gc) {
779 if (start_gc_thread(sbi))
780 f2fs_msg(sbi->sb, KERN_WARNING,
781 "background gc thread has stopped");
782 } else if (need_stop_gc) {
783 stop_gc_thread(sbi);
784 }
785 restore_opts:
786 sbi->mount_opt = org_mount_opt;
787 sbi->active_logs = active_logs;
788 return err;
789 }
790
791 static struct super_operations f2fs_sops = {
792 .alloc_inode = f2fs_alloc_inode,
793 .drop_inode = f2fs_drop_inode,
794 .destroy_inode = f2fs_destroy_inode,
795 .write_inode = f2fs_write_inode,
796 .dirty_inode = f2fs_dirty_inode,
797 .show_options = f2fs_show_options,
798 .evict_inode = f2fs_evict_inode,
799 .put_super = f2fs_put_super,
800 .sync_fs = f2fs_sync_fs,
801 .freeze_fs = f2fs_freeze,
802 .unfreeze_fs = f2fs_unfreeze,
803 .statfs = f2fs_statfs,
804 .remount_fs = f2fs_remount,
805 };
806
807 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
808 u64 ino, u32 generation)
809 {
810 struct f2fs_sb_info *sbi = F2FS_SB(sb);
811 struct inode *inode;
812
813 if (check_nid_range(sbi, ino))
814 return ERR_PTR(-ESTALE);
815
816 /*
817 * f2fs_iget isn't quite right if the inode is currently unallocated!
818 * However f2fs_iget currently does appropriate checks to handle stale
819 * inodes so everything is OK.
820 */
821 inode = f2fs_iget(sb, ino);
822 if (IS_ERR(inode))
823 return ERR_CAST(inode);
824 if (unlikely(generation && inode->i_generation != generation)) {
825 /* we didn't find the right inode.. */
826 iput(inode);
827 return ERR_PTR(-ESTALE);
828 }
829 return inode;
830 }
831
832 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
833 int fh_len, int fh_type)
834 {
835 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
836 f2fs_nfs_get_inode);
837 }
838
839 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
840 int fh_len, int fh_type)
841 {
842 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
843 f2fs_nfs_get_inode);
844 }
845
846 static const struct export_operations f2fs_export_ops = {
847 .fh_to_dentry = f2fs_fh_to_dentry,
848 .fh_to_parent = f2fs_fh_to_parent,
849 .get_parent = f2fs_get_parent,
850 };
851
852 static loff_t max_file_size(unsigned bits)
853 {
854 loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
855 loff_t leaf_count = ADDRS_PER_BLOCK;
856
857 /* two direct node blocks */
858 result += (leaf_count * 2);
859
860 /* two indirect node blocks */
861 leaf_count *= NIDS_PER_BLOCK;
862 result += (leaf_count * 2);
863
864 /* one double indirect node block */
865 leaf_count *= NIDS_PER_BLOCK;
866 result += leaf_count;
867
868 result <<= bits;
869 return result;
870 }
871
872 static int sanity_check_raw_super(struct super_block *sb,
873 struct f2fs_super_block *raw_super)
874 {
875 unsigned int blocksize;
876
877 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
878 f2fs_msg(sb, KERN_INFO,
879 "Magic Mismatch, valid(0x%x) - read(0x%x)",
880 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
881 return 1;
882 }
883
884 /* Currently, support only 4KB page cache size */
885 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
886 f2fs_msg(sb, KERN_INFO,
887 "Invalid page_cache_size (%lu), supports only 4KB\n",
888 PAGE_CACHE_SIZE);
889 return 1;
890 }
891
892 /* Currently, support only 4KB block size */
893 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
894 if (blocksize != F2FS_BLKSIZE) {
895 f2fs_msg(sb, KERN_INFO,
896 "Invalid blocksize (%u), supports only 4KB\n",
897 blocksize);
898 return 1;
899 }
900
901 /* Currently, support 512/1024/2048/4096 bytes sector size */
902 if (le32_to_cpu(raw_super->log_sectorsize) >
903 F2FS_MAX_LOG_SECTOR_SIZE ||
904 le32_to_cpu(raw_super->log_sectorsize) <
905 F2FS_MIN_LOG_SECTOR_SIZE) {
906 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)",
907 le32_to_cpu(raw_super->log_sectorsize));
908 return 1;
909 }
910 if (le32_to_cpu(raw_super->log_sectors_per_block) +
911 le32_to_cpu(raw_super->log_sectorsize) !=
912 F2FS_MAX_LOG_SECTOR_SIZE) {
913 f2fs_msg(sb, KERN_INFO,
914 "Invalid log sectors per block(%u) log sectorsize(%u)",
915 le32_to_cpu(raw_super->log_sectors_per_block),
916 le32_to_cpu(raw_super->log_sectorsize));
917 return 1;
918 }
919 return 0;
920 }
921
922 static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
923 {
924 unsigned int total, fsmeta;
925 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
926 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
927
928 total = le32_to_cpu(raw_super->segment_count);
929 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
930 fsmeta += le32_to_cpu(raw_super->segment_count_sit);
931 fsmeta += le32_to_cpu(raw_super->segment_count_nat);
932 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
933 fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
934
935 if (unlikely(fsmeta >= total))
936 return 1;
937
938 if (unlikely(f2fs_cp_error(sbi))) {
939 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
940 return 1;
941 }
942 return 0;
943 }
944
945 static void init_sb_info(struct f2fs_sb_info *sbi)
946 {
947 struct f2fs_super_block *raw_super = sbi->raw_super;
948 int i;
949
950 sbi->log_sectors_per_block =
951 le32_to_cpu(raw_super->log_sectors_per_block);
952 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
953 sbi->blocksize = 1 << sbi->log_blocksize;
954 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
955 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
956 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
957 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
958 sbi->total_sections = le32_to_cpu(raw_super->section_count);
959 sbi->total_node_count =
960 (le32_to_cpu(raw_super->segment_count_nat) / 2)
961 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
962 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
963 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
964 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
965 sbi->cur_victim_sec = NULL_SECNO;
966 sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
967
968 for (i = 0; i < NR_COUNT_TYPE; i++)
969 atomic_set(&sbi->nr_pages[i], 0);
970
971 sbi->dir_level = DEF_DIR_LEVEL;
972 clear_sbi_flag(sbi, SBI_NEED_FSCK);
973 }
974
975 /*
976 * Read f2fs raw super block.
977 * Because we have two copies of super block, so read the first one at first,
978 * if the first one is invalid, move to read the second one.
979 */
980 static int read_raw_super_block(struct super_block *sb,
981 struct f2fs_super_block **raw_super,
982 struct buffer_head **raw_super_buf,
983 int *recovery)
984 {
985 int block = 0;
986 struct buffer_head *buffer;
987 struct f2fs_super_block *super;
988 int err = 0;
989
990 retry:
991 buffer = sb_bread(sb, block);
992 if (!buffer) {
993 *recovery = 1;
994 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
995 block + 1);
996 if (block == 0) {
997 block++;
998 goto retry;
999 } else {
1000 err = -EIO;
1001 goto out;
1002 }
1003 }
1004
1005 super = (struct f2fs_super_block *)
1006 ((char *)(buffer)->b_data + F2FS_SUPER_OFFSET);
1007
1008 /* sanity checking of raw super */
1009 if (sanity_check_raw_super(sb, super)) {
1010 brelse(buffer);
1011 *recovery = 1;
1012 f2fs_msg(sb, KERN_ERR,
1013 "Can't find valid F2FS filesystem in %dth superblock",
1014 block + 1);
1015 if (block == 0) {
1016 block++;
1017 goto retry;
1018 } else {
1019 err = -EINVAL;
1020 goto out;
1021 }
1022 }
1023
1024 if (!*raw_super) {
1025 *raw_super_buf = buffer;
1026 *raw_super = super;
1027 } else {
1028 /* already have a valid superblock */
1029 brelse(buffer);
1030 }
1031
1032 /* check the validity of the second superblock */
1033 if (block == 0) {
1034 block++;
1035 goto retry;
1036 }
1037
1038 out:
1039 /* No valid superblock */
1040 if (!*raw_super)
1041 return err;
1042
1043 return 0;
1044 }
1045
1046 int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover)
1047 {
1048 struct buffer_head *sbh = sbi->raw_super_buf;
1049 sector_t block = sbh->b_blocknr;
1050 int err;
1051
1052 /* write back-up superblock first */
1053 sbh->b_blocknr = block ? 0 : 1;
1054 mark_buffer_dirty(sbh);
1055 err = sync_dirty_buffer(sbh);
1056
1057 sbh->b_blocknr = block;
1058
1059 /* if we are in recovery path, skip writing valid superblock */
1060 if (recover || err)
1061 goto out;
1062
1063 /* write current valid superblock */
1064 mark_buffer_dirty(sbh);
1065 err = sync_dirty_buffer(sbh);
1066 out:
1067 clear_buffer_write_io_error(sbh);
1068 set_buffer_uptodate(sbh);
1069 return err;
1070 }
1071
1072 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
1073 {
1074 struct f2fs_sb_info *sbi;
1075 struct f2fs_super_block *raw_super;
1076 struct buffer_head *raw_super_buf;
1077 struct inode *root;
1078 long err;
1079 bool retry = true, need_fsck = false;
1080 char *options = NULL;
1081 int recovery, i;
1082
1083 try_onemore:
1084 err = -EINVAL;
1085 raw_super = NULL;
1086 raw_super_buf = NULL;
1087 recovery = 0;
1088
1089 /* allocate memory for f2fs-specific super block info */
1090 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
1091 if (!sbi)
1092 return -ENOMEM;
1093
1094 /* set a block size */
1095 if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
1096 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
1097 goto free_sbi;
1098 }
1099
1100 err = read_raw_super_block(sb, &raw_super, &raw_super_buf, &recovery);
1101 if (err)
1102 goto free_sbi;
1103
1104 sb->s_fs_info = sbi;
1105 default_options(sbi);
1106 /* parse mount options */
1107 options = kstrdup((const char *)data, GFP_KERNEL);
1108 if (data && !options) {
1109 err = -ENOMEM;
1110 goto free_sb_buf;
1111 }
1112
1113 err = parse_options(sb, options);
1114 if (err)
1115 goto free_options;
1116
1117 sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
1118 sb->s_max_links = F2FS_LINK_MAX;
1119 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1120
1121 sb->s_op = &f2fs_sops;
1122 sb->s_xattr = f2fs_xattr_handlers;
1123 sb->s_export_op = &f2fs_export_ops;
1124 sb->s_magic = F2FS_SUPER_MAGIC;
1125 sb->s_time_gran = 1;
1126 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1127 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
1128 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
1129
1130 /* init f2fs-specific super block info */
1131 sbi->sb = sb;
1132 sbi->raw_super = raw_super;
1133 sbi->raw_super_buf = raw_super_buf;
1134 mutex_init(&sbi->gc_mutex);
1135 mutex_init(&sbi->writepages);
1136 mutex_init(&sbi->cp_mutex);
1137 init_rwsem(&sbi->node_write);
1138 clear_sbi_flag(sbi, SBI_POR_DOING);
1139 spin_lock_init(&sbi->stat_lock);
1140
1141 init_rwsem(&sbi->read_io.io_rwsem);
1142 sbi->read_io.sbi = sbi;
1143 sbi->read_io.bio = NULL;
1144 for (i = 0; i < NR_PAGE_TYPE; i++) {
1145 init_rwsem(&sbi->write_io[i].io_rwsem);
1146 sbi->write_io[i].sbi = sbi;
1147 sbi->write_io[i].bio = NULL;
1148 }
1149
1150 init_rwsem(&sbi->cp_rwsem);
1151 init_waitqueue_head(&sbi->cp_wait);
1152 init_sb_info(sbi);
1153
1154 /* get an inode for meta space */
1155 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
1156 if (IS_ERR(sbi->meta_inode)) {
1157 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
1158 err = PTR_ERR(sbi->meta_inode);
1159 goto free_options;
1160 }
1161
1162 err = get_valid_checkpoint(sbi);
1163 if (err) {
1164 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
1165 goto free_meta_inode;
1166 }
1167
1168 /* sanity checking of checkpoint */
1169 err = -EINVAL;
1170 if (sanity_check_ckpt(sbi)) {
1171 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
1172 goto free_cp;
1173 }
1174
1175 sbi->total_valid_node_count =
1176 le32_to_cpu(sbi->ckpt->valid_node_count);
1177 sbi->total_valid_inode_count =
1178 le32_to_cpu(sbi->ckpt->valid_inode_count);
1179 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
1180 sbi->total_valid_block_count =
1181 le64_to_cpu(sbi->ckpt->valid_block_count);
1182 sbi->last_valid_block_count = sbi->total_valid_block_count;
1183 sbi->alloc_valid_block_count = 0;
1184 INIT_LIST_HEAD(&sbi->dir_inode_list);
1185 spin_lock_init(&sbi->dir_inode_lock);
1186
1187 init_extent_cache_info(sbi);
1188
1189 init_ino_entry_info(sbi);
1190
1191 /* setup f2fs internal modules */
1192 err = build_segment_manager(sbi);
1193 if (err) {
1194 f2fs_msg(sb, KERN_ERR,
1195 "Failed to initialize F2FS segment manager");
1196 goto free_sm;
1197 }
1198 err = build_node_manager(sbi);
1199 if (err) {
1200 f2fs_msg(sb, KERN_ERR,
1201 "Failed to initialize F2FS node manager");
1202 goto free_nm;
1203 }
1204
1205 build_gc_manager(sbi);
1206
1207 /* get an inode for node space */
1208 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
1209 if (IS_ERR(sbi->node_inode)) {
1210 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
1211 err = PTR_ERR(sbi->node_inode);
1212 goto free_nm;
1213 }
1214
1215 /* if there are nt orphan nodes free them */
1216 recover_orphan_inodes(sbi);
1217
1218 /* read root inode and dentry */
1219 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
1220 if (IS_ERR(root)) {
1221 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
1222 err = PTR_ERR(root);
1223 goto free_node_inode;
1224 }
1225 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1226 iput(root);
1227 err = -EINVAL;
1228 goto free_node_inode;
1229 }
1230
1231 sb->s_root = d_make_root(root); /* allocate root dentry */
1232 if (!sb->s_root) {
1233 err = -ENOMEM;
1234 goto free_root_inode;
1235 }
1236
1237 err = f2fs_build_stats(sbi);
1238 if (err)
1239 goto free_root_inode;
1240
1241 if (f2fs_proc_root)
1242 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1243
1244 if (sbi->s_proc)
1245 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1246 &f2fs_seq_segment_info_fops, sb);
1247
1248 sbi->s_kobj.kset = f2fs_kset;
1249 init_completion(&sbi->s_kobj_unregister);
1250 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1251 "%s", sb->s_id);
1252 if (err)
1253 goto free_proc;
1254
1255 /* recover fsynced data */
1256 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1257 /*
1258 * mount should be failed, when device has readonly mode, and
1259 * previous checkpoint was not done by clean system shutdown.
1260 */
1261 if (bdev_read_only(sb->s_bdev) &&
1262 !is_set_ckpt_flags(sbi->ckpt, CP_UMOUNT_FLAG)) {
1263 err = -EROFS;
1264 goto free_kobj;
1265 }
1266
1267 if (need_fsck)
1268 set_sbi_flag(sbi, SBI_NEED_FSCK);
1269
1270 err = recover_fsync_data(sbi);
1271 if (err) {
1272 need_fsck = true;
1273 f2fs_msg(sb, KERN_ERR,
1274 "Cannot recover all fsync data errno=%ld", err);
1275 goto free_kobj;
1276 }
1277 }
1278
1279 /*
1280 * If filesystem is not mounted as read-only then
1281 * do start the gc_thread.
1282 */
1283 if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
1284 /* After POR, we can run background GC thread.*/
1285 err = start_gc_thread(sbi);
1286 if (err)
1287 goto free_kobj;
1288 }
1289 kfree(options);
1290
1291 /* recover broken superblock */
1292 if (recovery && !f2fs_readonly(sb) && !bdev_read_only(sb->s_bdev)) {
1293 f2fs_msg(sb, KERN_INFO, "Recover invalid superblock");
1294 f2fs_commit_super(sbi, true);
1295 }
1296
1297 return 0;
1298
1299 free_kobj:
1300 kobject_del(&sbi->s_kobj);
1301 free_proc:
1302 if (sbi->s_proc) {
1303 remove_proc_entry("segment_info", sbi->s_proc);
1304 remove_proc_entry(sb->s_id, f2fs_proc_root);
1305 }
1306 f2fs_destroy_stats(sbi);
1307 free_root_inode:
1308 dput(sb->s_root);
1309 sb->s_root = NULL;
1310 free_node_inode:
1311 iput(sbi->node_inode);
1312 free_nm:
1313 destroy_node_manager(sbi);
1314 free_sm:
1315 destroy_segment_manager(sbi);
1316 free_cp:
1317 kfree(sbi->ckpt);
1318 free_meta_inode:
1319 make_bad_inode(sbi->meta_inode);
1320 iput(sbi->meta_inode);
1321 free_options:
1322 kfree(options);
1323 free_sb_buf:
1324 brelse(raw_super_buf);
1325 free_sbi:
1326 kfree(sbi);
1327
1328 /* give only one another chance */
1329 if (retry) {
1330 retry = false;
1331 shrink_dcache_sb(sb);
1332 goto try_onemore;
1333 }
1334 return err;
1335 }
1336
1337 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1338 const char *dev_name, void *data)
1339 {
1340 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1341 }
1342
1343 static void kill_f2fs_super(struct super_block *sb)
1344 {
1345 if (sb->s_root)
1346 set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE);
1347 kill_block_super(sb);
1348 }
1349
1350 static struct file_system_type f2fs_fs_type = {
1351 .owner = THIS_MODULE,
1352 .name = "f2fs",
1353 .mount = f2fs_mount,
1354 .kill_sb = kill_f2fs_super,
1355 .fs_flags = FS_REQUIRES_DEV,
1356 };
1357 MODULE_ALIAS_FS("f2fs");
1358
1359 static int __init init_inodecache(void)
1360 {
1361 f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
1362 sizeof(struct f2fs_inode_info));
1363 if (!f2fs_inode_cachep)
1364 return -ENOMEM;
1365 return 0;
1366 }
1367
1368 static void destroy_inodecache(void)
1369 {
1370 /*
1371 * Make sure all delayed rcu free inodes are flushed before we
1372 * destroy cache.
1373 */
1374 rcu_barrier();
1375 kmem_cache_destroy(f2fs_inode_cachep);
1376 }
1377
1378 static int __init init_f2fs_fs(void)
1379 {
1380 int err;
1381
1382 f2fs_build_trace_ios();
1383
1384 err = init_inodecache();
1385 if (err)
1386 goto fail;
1387 err = create_node_manager_caches();
1388 if (err)
1389 goto free_inodecache;
1390 err = create_segment_manager_caches();
1391 if (err)
1392 goto free_node_manager_caches;
1393 err = create_checkpoint_caches();
1394 if (err)
1395 goto free_segment_manager_caches;
1396 err = create_extent_cache();
1397 if (err)
1398 goto free_checkpoint_caches;
1399 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1400 if (!f2fs_kset) {
1401 err = -ENOMEM;
1402 goto free_extent_cache;
1403 }
1404 err = f2fs_init_crypto();
1405 if (err)
1406 goto free_kset;
1407 err = register_filesystem(&f2fs_fs_type);
1408 if (err)
1409 goto free_crypto;
1410 f2fs_create_root_stats();
1411 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1412 return 0;
1413
1414 free_crypto:
1415 f2fs_exit_crypto();
1416 free_kset:
1417 kset_unregister(f2fs_kset);
1418 free_extent_cache:
1419 destroy_extent_cache();
1420 free_checkpoint_caches:
1421 destroy_checkpoint_caches();
1422 free_segment_manager_caches:
1423 destroy_segment_manager_caches();
1424 free_node_manager_caches:
1425 destroy_node_manager_caches();
1426 free_inodecache:
1427 destroy_inodecache();
1428 fail:
1429 return err;
1430 }
1431
1432 static void __exit exit_f2fs_fs(void)
1433 {
1434 remove_proc_entry("fs/f2fs", NULL);
1435 f2fs_destroy_root_stats();
1436 unregister_filesystem(&f2fs_fs_type);
1437 f2fs_exit_crypto();
1438 destroy_extent_cache();
1439 destroy_checkpoint_caches();
1440 destroy_segment_manager_caches();
1441 destroy_node_manager_caches();
1442 destroy_inodecache();
1443 kset_unregister(f2fs_kset);
1444 f2fs_destroy_trace_ios();
1445 }
1446
1447 module_init(init_f2fs_fs)
1448 module_exit(exit_f2fs_fs)
1449
1450 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1451 MODULE_DESCRIPTION("Flash Friendly File System");
1452 MODULE_LICENSE("GPL");
Linux with added FPC-III support