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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
38static struct proc_dir_entry *f2fs_proc_root;
39static struct kmem_cache *f2fs_inode_cachep;
40static struct kset *f2fs_kset;
41
42
43static struct shrinker f2fs_shrinker_info = {
44 .scan_objects = f2fs_shrink_scan,
45 .count_objects = f2fs_shrink_count,
46 .seeks = DEFAULT_SEEKS,
47};
48
49enum {
50 Opt_gc_background,
51 Opt_disable_roll_forward,
52 Opt_norecovery,
53 Opt_discard,
54 Opt_noheap,
55 Opt_user_xattr,
56 Opt_nouser_xattr,
57 Opt_acl,
58 Opt_noacl,
59 Opt_active_logs,
60 Opt_disable_ext_identify,
61 Opt_inline_xattr,
62 Opt_inline_data,
63 Opt_inline_dentry,
64 Opt_flush_merge,
65 Opt_nobarrier,
66 Opt_fastboot,
67 Opt_extent_cache,
68 Opt_noextent_cache,
69 Opt_noinline_data,
70 Opt_err,
71};
72
73static match_table_t f2fs_tokens = {
74 {Opt_gc_background, "background_gc=%s"},
75 {Opt_disable_roll_forward, "disable_roll_forward"},
76 {Opt_norecovery, "norecovery"},
77 {Opt_discard, "discard"},
78 {Opt_noheap, "no_heap"},
79 {Opt_user_xattr, "user_xattr"},
80 {Opt_nouser_xattr, "nouser_xattr"},
81 {Opt_acl, "acl"},
82 {Opt_noacl, "noacl"},
83 {Opt_active_logs, "active_logs=%u"},
84 {Opt_disable_ext_identify, "disable_ext_identify"},
85 {Opt_inline_xattr, "inline_xattr"},
86 {Opt_inline_data, "inline_data"},
87 {Opt_inline_dentry, "inline_dentry"},
88 {Opt_flush_merge, "flush_merge"},
89 {Opt_nobarrier, "nobarrier"},
90 {Opt_fastboot, "fastboot"},
91 {Opt_extent_cache, "extent_cache"},
92 {Opt_noextent_cache, "noextent_cache"},
93 {Opt_noinline_data, "noinline_data"},
94 {Opt_err, NULL},
95};
96
97
98enum {
99 GC_THREAD,
100 SM_INFO,
101 NM_INFO,
102 F2FS_SBI,
103};
104
105struct f2fs_attr {
106 struct attribute attr;
107 ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
108 ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
109 const char *, size_t);
110 int struct_type;
111 int offset;
112};
113
114static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
115{
116 if (struct_type == GC_THREAD)
117 return (unsigned char *)sbi->gc_thread;
118 else if (struct_type == SM_INFO)
119 return (unsigned char *)SM_I(sbi);
120 else if (struct_type == NM_INFO)
121 return (unsigned char *)NM_I(sbi);
122 else if (struct_type == F2FS_SBI)
123 return (unsigned char *)sbi;
124 return NULL;
125}
126
127static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
128 struct f2fs_sb_info *sbi, char *buf)
129{
130 unsigned char *ptr = NULL;
131 unsigned int *ui;
132
133 ptr = __struct_ptr(sbi, a->struct_type);
134 if (!ptr)
135 return -EINVAL;
136
137 ui = (unsigned int *)(ptr + a->offset);
138
139 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
140}
141
142static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
143 struct f2fs_sb_info *sbi,
144 const char *buf, size_t count)
145{
146 unsigned char *ptr;
147 unsigned long t;
148 unsigned int *ui;
149 ssize_t ret;
150
151 ptr = __struct_ptr(sbi, a->struct_type);
152 if (!ptr)
153 return -EINVAL;
154
155 ui = (unsigned int *)(ptr + a->offset);
156
157 ret = kstrtoul(skip_spaces(buf), 0, &t);
158 if (ret < 0)
159 return ret;
160 *ui = t;
161 return count;
162}
163
164static ssize_t f2fs_attr_show(struct kobject *kobj,
165 struct attribute *attr, char *buf)
166{
167 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
168 s_kobj);
169 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
170
171 return a->show ? a->show(a, sbi, buf) : 0;
172}
173
174static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
175 const char *buf, size_t len)
176{
177 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
178 s_kobj);
179 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
180
181 return a->store ? a->store(a, sbi, buf, len) : 0;
182}
183
184static void f2fs_sb_release(struct kobject *kobj)
185{
186 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
187 s_kobj);
188 complete(&sbi->s_kobj_unregister);
189}
190
191#define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
192static struct f2fs_attr f2fs_attr_##_name = { \
193 .attr = {.name = __stringify(_name), .mode = _mode }, \
194 .show = _show, \
195 .store = _store, \
196 .struct_type = _struct_type, \
197 .offset = _offset \
198}
199
200#define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \
201 F2FS_ATTR_OFFSET(struct_type, name, 0644, \
202 f2fs_sbi_show, f2fs_sbi_store, \
203 offsetof(struct struct_name, elname))
204
205F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
206F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
207F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
208F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
209F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
210F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
211F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
212F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
213F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
214F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
215F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
216F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);
217F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
218F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
219F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, cp_interval);
220
221#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
222static struct attribute *f2fs_attrs[] = {
223 ATTR_LIST(gc_min_sleep_time),
224 ATTR_LIST(gc_max_sleep_time),
225 ATTR_LIST(gc_no_gc_sleep_time),
226 ATTR_LIST(gc_idle),
227 ATTR_LIST(reclaim_segments),
228 ATTR_LIST(max_small_discards),
229 ATTR_LIST(batched_trim_sections),
230 ATTR_LIST(ipu_policy),
231 ATTR_LIST(min_ipu_util),
232 ATTR_LIST(min_fsync_blocks),
233 ATTR_LIST(max_victim_search),
234 ATTR_LIST(dir_level),
235 ATTR_LIST(ram_thresh),
236 ATTR_LIST(ra_nid_pages),
237 ATTR_LIST(cp_interval),
238 NULL,
239};
240
241static const struct sysfs_ops f2fs_attr_ops = {
242 .show = f2fs_attr_show,
243 .store = f2fs_attr_store,
244};
245
246static struct kobj_type f2fs_ktype = {
247 .default_attrs = f2fs_attrs,
248 .sysfs_ops = &f2fs_attr_ops,
249 .release = f2fs_sb_release,
250};
251
252void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
253{
254 struct va_format vaf;
255 va_list args;
256
257 va_start(args, fmt);
258 vaf.fmt = fmt;
259 vaf.va = &args;
260 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
261 va_end(args);
262}
263
264static void init_once(void *foo)
265{
266 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
267
268 inode_init_once(&fi->vfs_inode);
269}
270
271static int parse_options(struct super_block *sb, char *options)
272{
273 struct f2fs_sb_info *sbi = F2FS_SB(sb);
274 struct request_queue *q;
275 substring_t args[MAX_OPT_ARGS];
276 char *p, *name;
277 int arg = 0;
278
279 if (!options)
280 return 0;
281
282 while ((p = strsep(&options, ",")) != NULL) {
283 int token;
284 if (!*p)
285 continue;
286
287
288
289
290 args[0].to = args[0].from = NULL;
291 token = match_token(p, f2fs_tokens, args);
292
293 switch (token) {
294 case Opt_gc_background:
295 name = match_strdup(&args[0]);
296
297 if (!name)
298 return -ENOMEM;
299 if (strlen(name) == 2 && !strncmp(name, "on", 2)) {
300 set_opt(sbi, BG_GC);
301 clear_opt(sbi, FORCE_FG_GC);
302 } else if (strlen(name) == 3 && !strncmp(name, "off", 3)) {
303 clear_opt(sbi, BG_GC);
304 clear_opt(sbi, FORCE_FG_GC);
305 } else if (strlen(name) == 4 && !strncmp(name, "sync", 4)) {
306 set_opt(sbi, BG_GC);
307 set_opt(sbi, FORCE_FG_GC);
308 } else {
309 kfree(name);
310 return -EINVAL;
311 }
312 kfree(name);
313 break;
314 case Opt_disable_roll_forward:
315 set_opt(sbi, DISABLE_ROLL_FORWARD);
316 break;
317 case Opt_norecovery:
318
319 set_opt(sbi, DISABLE_ROLL_FORWARD);
320 if (!f2fs_readonly(sb))
321 return -EINVAL;
322 break;
323 case Opt_discard:
324 q = bdev_get_queue(sb->s_bdev);
325 if (blk_queue_discard(q)) {
326 set_opt(sbi, DISCARD);
327 } else {
328 f2fs_msg(sb, KERN_WARNING,
329 "mounting with \"discard\" option, but "
330 "the device does not support discard");
331 }
332 break;
333 case Opt_noheap:
334 set_opt(sbi, NOHEAP);
335 break;
336#ifdef CONFIG_F2FS_FS_XATTR
337 case Opt_user_xattr:
338 set_opt(sbi, XATTR_USER);
339 break;
340 case Opt_nouser_xattr:
341 clear_opt(sbi, XATTR_USER);
342 break;
343 case Opt_inline_xattr:
344 set_opt(sbi, INLINE_XATTR);
345 break;
346#else
347 case Opt_user_xattr:
348 f2fs_msg(sb, KERN_INFO,
349 "user_xattr options not supported");
350 break;
351 case Opt_nouser_xattr:
352 f2fs_msg(sb, KERN_INFO,
353 "nouser_xattr options not supported");
354 break;
355 case Opt_inline_xattr:
356 f2fs_msg(sb, KERN_INFO,
357 "inline_xattr options not supported");
358 break;
359#endif
360#ifdef CONFIG_F2FS_FS_POSIX_ACL
361 case Opt_acl:
362 set_opt(sbi, POSIX_ACL);
363 break;
364 case Opt_noacl:
365 clear_opt(sbi, POSIX_ACL);
366 break;
367#else
368 case Opt_acl:
369 f2fs_msg(sb, KERN_INFO, "acl options not supported");
370 break;
371 case Opt_noacl:
372 f2fs_msg(sb, KERN_INFO, "noacl options not supported");
373 break;
374#endif
375 case Opt_active_logs:
376 if (args->from && match_int(args, &arg))
377 return -EINVAL;
378 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
379 return -EINVAL;
380 sbi->active_logs = arg;
381 break;
382 case Opt_disable_ext_identify:
383 set_opt(sbi, DISABLE_EXT_IDENTIFY);
384 break;
385 case Opt_inline_data:
386 set_opt(sbi, INLINE_DATA);
387 break;
388 case Opt_inline_dentry:
389 set_opt(sbi, INLINE_DENTRY);
390 break;
391 case Opt_flush_merge:
392 set_opt(sbi, FLUSH_MERGE);
393 break;
394 case Opt_nobarrier:
395 set_opt(sbi, NOBARRIER);
396 break;
397 case Opt_fastboot:
398 set_opt(sbi, FASTBOOT);
399 break;
400 case Opt_extent_cache:
401 set_opt(sbi, EXTENT_CACHE);
402 break;
403 case Opt_noextent_cache:
404 clear_opt(sbi, EXTENT_CACHE);
405 break;
406 case Opt_noinline_data:
407 clear_opt(sbi, INLINE_DATA);
408 break;
409 default:
410 f2fs_msg(sb, KERN_ERR,
411 "Unrecognized mount option \"%s\" or missing value",
412 p);
413 return -EINVAL;
414 }
415 }
416 return 0;
417}
418
419static struct inode *f2fs_alloc_inode(struct super_block *sb)
420{
421 struct f2fs_inode_info *fi;
422
423 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
424 if (!fi)
425 return NULL;
426
427 init_once((void *) fi);
428
429
430 fi->vfs_inode.i_version = 1;
431 atomic_set(&fi->dirty_pages, 0);
432 fi->i_current_depth = 1;
433 fi->i_advise = 0;
434 init_rwsem(&fi->i_sem);
435 INIT_LIST_HEAD(&fi->inmem_pages);
436 mutex_init(&fi->inmem_lock);
437
438 set_inode_flag(fi, FI_NEW_INODE);
439
440 if (test_opt(F2FS_SB(sb), INLINE_XATTR))
441 set_inode_flag(fi, FI_INLINE_XATTR);
442
443
444 fi->i_dir_level = F2FS_SB(sb)->dir_level;
445
446#ifdef CONFIG_F2FS_FS_ENCRYPTION
447 fi->i_crypt_info = NULL;
448#endif
449 return &fi->vfs_inode;
450}
451
452static int f2fs_drop_inode(struct inode *inode)
453{
454
455
456
457
458
459
460
461 if (!inode_unhashed(inode) && inode->i_state & I_SYNC) {
462 if (!inode->i_nlink && !is_bad_inode(inode)) {
463
464 atomic_inc(&inode->i_count);
465 spin_unlock(&inode->i_lock);
466
467
468 if (f2fs_is_atomic_file(inode))
469 commit_inmem_pages(inode, true);
470
471
472 f2fs_destroy_extent_node(inode);
473
474 sb_start_intwrite(inode->i_sb);
475 i_size_write(inode, 0);
476
477 if (F2FS_HAS_BLOCKS(inode))
478 f2fs_truncate(inode, true);
479
480 sb_end_intwrite(inode->i_sb);
481
482#ifdef CONFIG_F2FS_FS_ENCRYPTION
483 if (F2FS_I(inode)->i_crypt_info)
484 f2fs_free_encryption_info(inode,
485 F2FS_I(inode)->i_crypt_info);
486#endif
487 spin_lock(&inode->i_lock);
488 atomic_dec(&inode->i_count);
489 }
490 return 0;
491 }
492 return generic_drop_inode(inode);
493}
494
495
496
497
498
499
500static void f2fs_dirty_inode(struct inode *inode, int flags)
501{
502 set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
503}
504
505static void f2fs_i_callback(struct rcu_head *head)
506{
507 struct inode *inode = container_of(head, struct inode, i_rcu);
508 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
509}
510
511static void f2fs_destroy_inode(struct inode *inode)
512{
513 call_rcu(&inode->i_rcu, f2fs_i_callback);
514}
515
516static void f2fs_put_super(struct super_block *sb)
517{
518 struct f2fs_sb_info *sbi = F2FS_SB(sb);
519
520 if (sbi->s_proc) {
521 remove_proc_entry("segment_info", sbi->s_proc);
522 remove_proc_entry(sb->s_id, f2fs_proc_root);
523 }
524 kobject_del(&sbi->s_kobj);
525
526 stop_gc_thread(sbi);
527
528
529 mutex_lock(&sbi->umount_mutex);
530
531
532
533
534
535
536 if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
537 !is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) {
538 struct cp_control cpc = {
539 .reason = CP_UMOUNT,
540 };
541 write_checkpoint(sbi, &cpc);
542 }
543
544
545 f2fs_destroy_stats(sbi);
546
547
548
549
550
551 release_dirty_inode(sbi);
552 release_discard_addrs(sbi);
553
554 f2fs_leave_shrinker(sbi);
555 mutex_unlock(&sbi->umount_mutex);
556
557 iput(sbi->node_inode);
558 iput(sbi->meta_inode);
559
560
561 destroy_node_manager(sbi);
562 destroy_segment_manager(sbi);
563
564 kfree(sbi->ckpt);
565 kobject_put(&sbi->s_kobj);
566 wait_for_completion(&sbi->s_kobj_unregister);
567
568 sb->s_fs_info = NULL;
569 brelse(sbi->raw_super_buf);
570 kfree(sbi);
571}
572
573int f2fs_sync_fs(struct super_block *sb, int sync)
574{
575 struct f2fs_sb_info *sbi = F2FS_SB(sb);
576
577 trace_f2fs_sync_fs(sb, sync);
578
579 if (sync) {
580 struct cp_control cpc;
581
582 cpc.reason = __get_cp_reason(sbi);
583
584 mutex_lock(&sbi->gc_mutex);
585 write_checkpoint(sbi, &cpc);
586 mutex_unlock(&sbi->gc_mutex);
587 } else {
588 f2fs_balance_fs(sbi);
589 }
590 f2fs_trace_ios(NULL, 1);
591
592 return 0;
593}
594
595static int f2fs_freeze(struct super_block *sb)
596{
597 int err;
598
599 if (f2fs_readonly(sb))
600 return 0;
601
602 err = f2fs_sync_fs(sb, 1);
603 return err;
604}
605
606static int f2fs_unfreeze(struct super_block *sb)
607{
608 return 0;
609}
610
611static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
612{
613 struct super_block *sb = dentry->d_sb;
614 struct f2fs_sb_info *sbi = F2FS_SB(sb);
615 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
616 block_t total_count, user_block_count, start_count, ovp_count;
617
618 total_count = le64_to_cpu(sbi->raw_super->block_count);
619 user_block_count = sbi->user_block_count;
620 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
621 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
622 buf->f_type = F2FS_SUPER_MAGIC;
623 buf->f_bsize = sbi->blocksize;
624
625 buf->f_blocks = total_count - start_count;
626 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
627 buf->f_bavail = user_block_count - valid_user_blocks(sbi);
628
629 buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
630 buf->f_ffree = buf->f_files - valid_inode_count(sbi);
631
632 buf->f_namelen = F2FS_NAME_LEN;
633 buf->f_fsid.val[0] = (u32)id;
634 buf->f_fsid.val[1] = (u32)(id >> 32);
635
636 return 0;
637}
638
639static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
640{
641 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
642
643 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC)) {
644 if (test_opt(sbi, FORCE_FG_GC))
645 seq_printf(seq, ",background_gc=%s", "sync");
646 else
647 seq_printf(seq, ",background_gc=%s", "on");
648 } else {
649 seq_printf(seq, ",background_gc=%s", "off");
650 }
651 if (test_opt(sbi, DISABLE_ROLL_FORWARD))
652 seq_puts(seq, ",disable_roll_forward");
653 if (test_opt(sbi, DISCARD))
654 seq_puts(seq, ",discard");
655 if (test_opt(sbi, NOHEAP))
656 seq_puts(seq, ",no_heap_alloc");
657#ifdef CONFIG_F2FS_FS_XATTR
658 if (test_opt(sbi, XATTR_USER))
659 seq_puts(seq, ",user_xattr");
660 else
661 seq_puts(seq, ",nouser_xattr");
662 if (test_opt(sbi, INLINE_XATTR))
663 seq_puts(seq, ",inline_xattr");
664#endif
665#ifdef CONFIG_F2FS_FS_POSIX_ACL
666 if (test_opt(sbi, POSIX_ACL))
667 seq_puts(seq, ",acl");
668 else
669 seq_puts(seq, ",noacl");
670#endif
671 if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
672 seq_puts(seq, ",disable_ext_identify");
673 if (test_opt(sbi, INLINE_DATA))
674 seq_puts(seq, ",inline_data");
675 else
676 seq_puts(seq, ",noinline_data");
677 if (test_opt(sbi, INLINE_DENTRY))
678 seq_puts(seq, ",inline_dentry");
679 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
680 seq_puts(seq, ",flush_merge");
681 if (test_opt(sbi, NOBARRIER))
682 seq_puts(seq, ",nobarrier");
683 if (test_opt(sbi, FASTBOOT))
684 seq_puts(seq, ",fastboot");
685 if (test_opt(sbi, EXTENT_CACHE))
686 seq_puts(seq, ",extent_cache");
687 else
688 seq_puts(seq, ",noextent_cache");
689 seq_printf(seq, ",active_logs=%u", sbi->active_logs);
690
691 return 0;
692}
693
694static int segment_info_seq_show(struct seq_file *seq, void *offset)
695{
696 struct super_block *sb = seq->private;
697 struct f2fs_sb_info *sbi = F2FS_SB(sb);
698 unsigned int total_segs =
699 le32_to_cpu(sbi->raw_super->segment_count_main);
700 int i;
701
702 seq_puts(seq, "format: segment_type|valid_blocks\n"
703 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
704
705 for (i = 0; i < total_segs; i++) {
706 struct seg_entry *se = get_seg_entry(sbi, i);
707
708 if ((i % 10) == 0)
709 seq_printf(seq, "%-10d", i);
710 seq_printf(seq, "%d|%-3u", se->type,
711 get_valid_blocks(sbi, i, 1));
712 if ((i % 10) == 9 || i == (total_segs - 1))
713 seq_putc(seq, '\n');
714 else
715 seq_putc(seq, ' ');
716 }
717
718 return 0;
719}
720
721static int segment_info_open_fs(struct inode *inode, struct file *file)
722{
723 return single_open(file, segment_info_seq_show, PDE_DATA(inode));
724}
725
726static const struct file_operations f2fs_seq_segment_info_fops = {
727 .owner = THIS_MODULE,
728 .open = segment_info_open_fs,
729 .read = seq_read,
730 .llseek = seq_lseek,
731 .release = single_release,
732};
733
734static void default_options(struct f2fs_sb_info *sbi)
735{
736
737 sbi->active_logs = NR_CURSEG_TYPE;
738
739 set_opt(sbi, BG_GC);
740 set_opt(sbi, INLINE_DATA);
741 set_opt(sbi, EXTENT_CACHE);
742
743#ifdef CONFIG_F2FS_FS_XATTR
744 set_opt(sbi, XATTR_USER);
745#endif
746#ifdef CONFIG_F2FS_FS_POSIX_ACL
747 set_opt(sbi, POSIX_ACL);
748#endif
749}
750
751static int f2fs_remount(struct super_block *sb, int *flags, char *data)
752{
753 struct f2fs_sb_info *sbi = F2FS_SB(sb);
754 struct f2fs_mount_info org_mount_opt;
755 int err, active_logs;
756 bool need_restart_gc = false;
757 bool need_stop_gc = false;
758 bool no_extent_cache = !test_opt(sbi, EXTENT_CACHE);
759
760 sync_filesystem(sb);
761
762
763
764
765
766 org_mount_opt = sbi->mount_opt;
767 active_logs = sbi->active_logs;
768
769 sbi->mount_opt.opt = 0;
770 default_options(sbi);
771
772
773 err = parse_options(sb, data);
774 if (err)
775 goto restore_opts;
776
777
778
779
780
781 if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
782 goto skip;
783
784
785 if (no_extent_cache == !!test_opt(sbi, EXTENT_CACHE)) {
786 err = -EINVAL;
787 f2fs_msg(sbi->sb, KERN_WARNING,
788 "switch extent_cache option is not allowed");
789 goto restore_opts;
790 }
791
792
793
794
795
796
797 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
798 if (sbi->gc_thread) {
799 stop_gc_thread(sbi);
800 f2fs_sync_fs(sb, 1);
801 need_restart_gc = true;
802 }
803 } else if (!sbi->gc_thread) {
804 err = start_gc_thread(sbi);
805 if (err)
806 goto restore_opts;
807 need_stop_gc = true;
808 }
809
810
811
812
813
814 if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
815 destroy_flush_cmd_control(sbi);
816 } else if (!SM_I(sbi)->cmd_control_info) {
817 err = create_flush_cmd_control(sbi);
818 if (err)
819 goto restore_gc;
820 }
821skip:
822
823 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
824 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
825 return 0;
826restore_gc:
827 if (need_restart_gc) {
828 if (start_gc_thread(sbi))
829 f2fs_msg(sbi->sb, KERN_WARNING,
830 "background gc thread has stopped");
831 } else if (need_stop_gc) {
832 stop_gc_thread(sbi);
833 }
834restore_opts:
835 sbi->mount_opt = org_mount_opt;
836 sbi->active_logs = active_logs;
837 return err;
838}
839
840static struct super_operations f2fs_sops = {
841 .alloc_inode = f2fs_alloc_inode,
842 .drop_inode = f2fs_drop_inode,
843 .destroy_inode = f2fs_destroy_inode,
844 .write_inode = f2fs_write_inode,
845 .dirty_inode = f2fs_dirty_inode,
846 .show_options = f2fs_show_options,
847 .evict_inode = f2fs_evict_inode,
848 .put_super = f2fs_put_super,
849 .sync_fs = f2fs_sync_fs,
850 .freeze_fs = f2fs_freeze,
851 .unfreeze_fs = f2fs_unfreeze,
852 .statfs = f2fs_statfs,
853 .remount_fs = f2fs_remount,
854};
855
856static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
857 u64 ino, u32 generation)
858{
859 struct f2fs_sb_info *sbi = F2FS_SB(sb);
860 struct inode *inode;
861
862 if (check_nid_range(sbi, ino))
863 return ERR_PTR(-ESTALE);
864
865
866
867
868
869
870 inode = f2fs_iget(sb, ino);
871 if (IS_ERR(inode))
872 return ERR_CAST(inode);
873 if (unlikely(generation && inode->i_generation != generation)) {
874
875 iput(inode);
876 return ERR_PTR(-ESTALE);
877 }
878 return inode;
879}
880
881static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
882 int fh_len, int fh_type)
883{
884 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
885 f2fs_nfs_get_inode);
886}
887
888static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
889 int fh_len, int fh_type)
890{
891 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
892 f2fs_nfs_get_inode);
893}
894
895static const struct export_operations f2fs_export_ops = {
896 .fh_to_dentry = f2fs_fh_to_dentry,
897 .fh_to_parent = f2fs_fh_to_parent,
898 .get_parent = f2fs_get_parent,
899};
900
901static loff_t max_file_size(unsigned bits)
902{
903 loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
904 loff_t leaf_count = ADDRS_PER_BLOCK;
905
906
907 result += (leaf_count * 2);
908
909
910 leaf_count *= NIDS_PER_BLOCK;
911 result += (leaf_count * 2);
912
913
914 leaf_count *= NIDS_PER_BLOCK;
915 result += leaf_count;
916
917 result <<= bits;
918 return result;
919}
920
921static int sanity_check_raw_super(struct super_block *sb,
922 struct f2fs_super_block *raw_super)
923{
924 unsigned int blocksize;
925
926 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
927 f2fs_msg(sb, KERN_INFO,
928 "Magic Mismatch, valid(0x%x) - read(0x%x)",
929 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
930 return 1;
931 }
932
933
934 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
935 f2fs_msg(sb, KERN_INFO,
936 "Invalid page_cache_size (%lu), supports only 4KB\n",
937 PAGE_CACHE_SIZE);
938 return 1;
939 }
940
941
942 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
943 if (blocksize != F2FS_BLKSIZE) {
944 f2fs_msg(sb, KERN_INFO,
945 "Invalid blocksize (%u), supports only 4KB\n",
946 blocksize);
947 return 1;
948 }
949
950
951 if (le32_to_cpu(raw_super->log_sectorsize) >
952 F2FS_MAX_LOG_SECTOR_SIZE ||
953 le32_to_cpu(raw_super->log_sectorsize) <
954 F2FS_MIN_LOG_SECTOR_SIZE) {
955 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)",
956 le32_to_cpu(raw_super->log_sectorsize));
957 return 1;
958 }
959 if (le32_to_cpu(raw_super->log_sectors_per_block) +
960 le32_to_cpu(raw_super->log_sectorsize) !=
961 F2FS_MAX_LOG_SECTOR_SIZE) {
962 f2fs_msg(sb, KERN_INFO,
963 "Invalid log sectors per block(%u) log sectorsize(%u)",
964 le32_to_cpu(raw_super->log_sectors_per_block),
965 le32_to_cpu(raw_super->log_sectorsize));
966 return 1;
967 }
968 return 0;
969}
970
971static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
972{
973 unsigned int total, fsmeta;
974 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
975 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
976
977 total = le32_to_cpu(raw_super->segment_count);
978 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
979 fsmeta += le32_to_cpu(raw_super->segment_count_sit);
980 fsmeta += le32_to_cpu(raw_super->segment_count_nat);
981 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
982 fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
983
984 if (unlikely(fsmeta >= total))
985 return 1;
986
987 if (unlikely(f2fs_cp_error(sbi))) {
988 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
989 return 1;
990 }
991 return 0;
992}
993
994static void init_sb_info(struct f2fs_sb_info *sbi)
995{
996 struct f2fs_super_block *raw_super = sbi->raw_super;
997 int i;
998
999 sbi->log_sectors_per_block =
1000 le32_to_cpu(raw_super->log_sectors_per_block);
1001 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
1002 sbi->blocksize = 1 << sbi->log_blocksize;
1003 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
1004 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
1005 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
1006 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
1007 sbi->total_sections = le32_to_cpu(raw_super->section_count);
1008 sbi->total_node_count =
1009 (le32_to_cpu(raw_super->segment_count_nat) / 2)
1010 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
1011 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
1012 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
1013 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
1014 sbi->cur_victim_sec = NULL_SECNO;
1015 sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
1016
1017 for (i = 0; i < NR_COUNT_TYPE; i++)
1018 atomic_set(&sbi->nr_pages[i], 0);
1019
1020 sbi->dir_level = DEF_DIR_LEVEL;
1021 sbi->cp_interval = DEF_CP_INTERVAL;
1022 clear_sbi_flag(sbi, SBI_NEED_FSCK);
1023
1024 INIT_LIST_HEAD(&sbi->s_list);
1025 mutex_init(&sbi->umount_mutex);
1026}
1027
1028
1029
1030
1031
1032
1033static int read_raw_super_block(struct super_block *sb,
1034 struct f2fs_super_block **raw_super,
1035 struct buffer_head **raw_super_buf,
1036 int *recovery)
1037{
1038 int block = 0;
1039 struct buffer_head *buffer;
1040 struct f2fs_super_block *super;
1041 int err = 0;
1042
1043retry:
1044 buffer = sb_bread(sb, block);
1045 if (!buffer) {
1046 *recovery = 1;
1047 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
1048 block + 1);
1049 if (block == 0) {
1050 block++;
1051 goto retry;
1052 } else {
1053 err = -EIO;
1054 goto out;
1055 }
1056 }
1057
1058 super = (struct f2fs_super_block *)
1059 ((char *)(buffer)->b_data + F2FS_SUPER_OFFSET);
1060
1061
1062 if (sanity_check_raw_super(sb, super)) {
1063 brelse(buffer);
1064 *recovery = 1;
1065 f2fs_msg(sb, KERN_ERR,
1066 "Can't find valid F2FS filesystem in %dth superblock",
1067 block + 1);
1068 if (block == 0) {
1069 block++;
1070 goto retry;
1071 } else {
1072 err = -EINVAL;
1073 goto out;
1074 }
1075 }
1076
1077 if (!*raw_super) {
1078 *raw_super_buf = buffer;
1079 *raw_super = super;
1080 } else {
1081
1082 brelse(buffer);
1083 }
1084
1085
1086 if (block == 0) {
1087 block++;
1088 goto retry;
1089 }
1090
1091out:
1092
1093 if (!*raw_super)
1094 return err;
1095
1096 return 0;
1097}
1098
1099int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover)
1100{
1101 struct buffer_head *sbh = sbi->raw_super_buf;
1102 sector_t block = sbh->b_blocknr;
1103 int err;
1104
1105
1106 sbh->b_blocknr = block ? 0 : 1;
1107 mark_buffer_dirty(sbh);
1108 err = sync_dirty_buffer(sbh);
1109
1110 sbh->b_blocknr = block;
1111
1112
1113 if (recover || err)
1114 goto out;
1115
1116
1117 mark_buffer_dirty(sbh);
1118 err = sync_dirty_buffer(sbh);
1119out:
1120 clear_buffer_write_io_error(sbh);
1121 set_buffer_uptodate(sbh);
1122 return err;
1123}
1124
1125static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
1126{
1127 struct f2fs_sb_info *sbi;
1128 struct f2fs_super_block *raw_super;
1129 struct buffer_head *raw_super_buf;
1130 struct inode *root;
1131 long err;
1132 bool retry = true, need_fsck = false;
1133 char *options = NULL;
1134 int recovery, i;
1135
1136try_onemore:
1137 err = -EINVAL;
1138 raw_super = NULL;
1139 raw_super_buf = NULL;
1140 recovery = 0;
1141
1142
1143 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
1144 if (!sbi)
1145 return -ENOMEM;
1146
1147
1148 if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
1149 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
1150 goto free_sbi;
1151 }
1152
1153 err = read_raw_super_block(sb, &raw_super, &raw_super_buf, &recovery);
1154 if (err)
1155 goto free_sbi;
1156
1157 sb->s_fs_info = sbi;
1158 default_options(sbi);
1159
1160 options = kstrdup((const char *)data, GFP_KERNEL);
1161 if (data && !options) {
1162 err = -ENOMEM;
1163 goto free_sb_buf;
1164 }
1165
1166 err = parse_options(sb, options);
1167 if (err)
1168 goto free_options;
1169
1170 sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
1171 sb->s_max_links = F2FS_LINK_MAX;
1172 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1173
1174 sb->s_op = &f2fs_sops;
1175 sb->s_xattr = f2fs_xattr_handlers;
1176 sb->s_export_op = &f2fs_export_ops;
1177 sb->s_magic = F2FS_SUPER_MAGIC;
1178 sb->s_time_gran = 1;
1179 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1180 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
1181 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
1182
1183
1184 sbi->sb = sb;
1185 sbi->raw_super = raw_super;
1186 sbi->raw_super_buf = raw_super_buf;
1187 mutex_init(&sbi->gc_mutex);
1188 mutex_init(&sbi->writepages);
1189 mutex_init(&sbi->cp_mutex);
1190 init_rwsem(&sbi->node_write);
1191
1192
1193 set_sbi_flag(sbi, SBI_POR_DOING);
1194 spin_lock_init(&sbi->stat_lock);
1195
1196 init_rwsem(&sbi->read_io.io_rwsem);
1197 sbi->read_io.sbi = sbi;
1198 sbi->read_io.bio = NULL;
1199 for (i = 0; i < NR_PAGE_TYPE; i++) {
1200 init_rwsem(&sbi->write_io[i].io_rwsem);
1201 sbi->write_io[i].sbi = sbi;
1202 sbi->write_io[i].bio = NULL;
1203 }
1204
1205 init_rwsem(&sbi->cp_rwsem);
1206 init_waitqueue_head(&sbi->cp_wait);
1207 init_sb_info(sbi);
1208
1209
1210 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
1211 if (IS_ERR(sbi->meta_inode)) {
1212 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
1213 err = PTR_ERR(sbi->meta_inode);
1214 goto free_options;
1215 }
1216
1217 err = get_valid_checkpoint(sbi);
1218 if (err) {
1219 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
1220 goto free_meta_inode;
1221 }
1222
1223
1224 err = -EINVAL;
1225 if (sanity_check_ckpt(sbi)) {
1226 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
1227 goto free_cp;
1228 }
1229
1230 sbi->total_valid_node_count =
1231 le32_to_cpu(sbi->ckpt->valid_node_count);
1232 sbi->total_valid_inode_count =
1233 le32_to_cpu(sbi->ckpt->valid_inode_count);
1234 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
1235 sbi->total_valid_block_count =
1236 le64_to_cpu(sbi->ckpt->valid_block_count);
1237 sbi->last_valid_block_count = sbi->total_valid_block_count;
1238 sbi->alloc_valid_block_count = 0;
1239 INIT_LIST_HEAD(&sbi->dir_inode_list);
1240 spin_lock_init(&sbi->dir_inode_lock);
1241
1242 init_extent_cache_info(sbi);
1243
1244 init_ino_entry_info(sbi);
1245
1246
1247 err = build_segment_manager(sbi);
1248 if (err) {
1249 f2fs_msg(sb, KERN_ERR,
1250 "Failed to initialize F2FS segment manager");
1251 goto free_sm;
1252 }
1253 err = build_node_manager(sbi);
1254 if (err) {
1255 f2fs_msg(sb, KERN_ERR,
1256 "Failed to initialize F2FS node manager");
1257 goto free_nm;
1258 }
1259
1260 build_gc_manager(sbi);
1261
1262
1263 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
1264 if (IS_ERR(sbi->node_inode)) {
1265 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
1266 err = PTR_ERR(sbi->node_inode);
1267 goto free_nm;
1268 }
1269
1270 f2fs_join_shrinker(sbi);
1271
1272
1273 err = recover_orphan_inodes(sbi);
1274 if (err)
1275 goto free_node_inode;
1276
1277
1278 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
1279 if (IS_ERR(root)) {
1280 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
1281 err = PTR_ERR(root);
1282 goto free_node_inode;
1283 }
1284 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1285 iput(root);
1286 err = -EINVAL;
1287 goto free_node_inode;
1288 }
1289
1290 sb->s_root = d_make_root(root);
1291 if (!sb->s_root) {
1292 err = -ENOMEM;
1293 goto free_root_inode;
1294 }
1295
1296 err = f2fs_build_stats(sbi);
1297 if (err)
1298 goto free_root_inode;
1299
1300 if (f2fs_proc_root)
1301 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1302
1303 if (sbi->s_proc)
1304 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1305 &f2fs_seq_segment_info_fops, sb);
1306
1307 sbi->s_kobj.kset = f2fs_kset;
1308 init_completion(&sbi->s_kobj_unregister);
1309 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1310 "%s", sb->s_id);
1311 if (err)
1312 goto free_proc;
1313
1314
1315 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1316
1317
1318
1319
1320 if (bdev_read_only(sb->s_bdev) &&
1321 !is_set_ckpt_flags(sbi->ckpt, CP_UMOUNT_FLAG)) {
1322 err = -EROFS;
1323 goto free_kobj;
1324 }
1325
1326 if (need_fsck)
1327 set_sbi_flag(sbi, SBI_NEED_FSCK);
1328
1329 err = recover_fsync_data(sbi);
1330 if (err) {
1331 need_fsck = true;
1332 f2fs_msg(sb, KERN_ERR,
1333 "Cannot recover all fsync data errno=%ld", err);
1334 goto free_kobj;
1335 }
1336 }
1337
1338 clear_sbi_flag(sbi, SBI_POR_DOING);
1339
1340
1341
1342
1343
1344 if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
1345
1346 err = start_gc_thread(sbi);
1347 if (err)
1348 goto free_kobj;
1349 }
1350 kfree(options);
1351
1352
1353 if (recovery && !f2fs_readonly(sb) && !bdev_read_only(sb->s_bdev)) {
1354 f2fs_msg(sb, KERN_INFO, "Recover invalid superblock");
1355 f2fs_commit_super(sbi, true);
1356 }
1357
1358 sbi->cp_expires = round_jiffies_up(jiffies);
1359
1360 return 0;
1361
1362free_kobj:
1363 kobject_del(&sbi->s_kobj);
1364free_proc:
1365 if (sbi->s_proc) {
1366 remove_proc_entry("segment_info", sbi->s_proc);
1367 remove_proc_entry(sb->s_id, f2fs_proc_root);
1368 }
1369 f2fs_destroy_stats(sbi);
1370free_root_inode:
1371 dput(sb->s_root);
1372 sb->s_root = NULL;
1373free_node_inode:
1374 mutex_lock(&sbi->umount_mutex);
1375 f2fs_leave_shrinker(sbi);
1376 iput(sbi->node_inode);
1377 mutex_unlock(&sbi->umount_mutex);
1378free_nm:
1379 destroy_node_manager(sbi);
1380free_sm:
1381 destroy_segment_manager(sbi);
1382free_cp:
1383 kfree(sbi->ckpt);
1384free_meta_inode:
1385 make_bad_inode(sbi->meta_inode);
1386 iput(sbi->meta_inode);
1387free_options:
1388 kfree(options);
1389free_sb_buf:
1390 brelse(raw_super_buf);
1391free_sbi:
1392 kfree(sbi);
1393
1394
1395 if (retry) {
1396 retry = false;
1397 shrink_dcache_sb(sb);
1398 goto try_onemore;
1399 }
1400 return err;
1401}
1402
1403static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1404 const char *dev_name, void *data)
1405{
1406 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1407}
1408
1409static void kill_f2fs_super(struct super_block *sb)
1410{
1411 if (sb->s_root)
1412 set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE);
1413 kill_block_super(sb);
1414}
1415
1416static struct file_system_type f2fs_fs_type = {
1417 .owner = THIS_MODULE,
1418 .name = "f2fs",
1419 .mount = f2fs_mount,
1420 .kill_sb = kill_f2fs_super,
1421 .fs_flags = FS_REQUIRES_DEV,
1422};
1423MODULE_ALIAS_FS("f2fs");
1424
1425static int __init init_inodecache(void)
1426{
1427 f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
1428 sizeof(struct f2fs_inode_info));
1429 if (!f2fs_inode_cachep)
1430 return -ENOMEM;
1431 return 0;
1432}
1433
1434static void destroy_inodecache(void)
1435{
1436
1437
1438
1439
1440 rcu_barrier();
1441 kmem_cache_destroy(f2fs_inode_cachep);
1442}
1443
1444static int __init init_f2fs_fs(void)
1445{
1446 int err;
1447
1448 f2fs_build_trace_ios();
1449
1450 err = init_inodecache();
1451 if (err)
1452 goto fail;
1453 err = create_node_manager_caches();
1454 if (err)
1455 goto free_inodecache;
1456 err = create_segment_manager_caches();
1457 if (err)
1458 goto free_node_manager_caches;
1459 err = create_checkpoint_caches();
1460 if (err)
1461 goto free_segment_manager_caches;
1462 err = create_extent_cache();
1463 if (err)
1464 goto free_checkpoint_caches;
1465 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1466 if (!f2fs_kset) {
1467 err = -ENOMEM;
1468 goto free_extent_cache;
1469 }
1470 err = f2fs_init_crypto();
1471 if (err)
1472 goto free_kset;
1473
1474 err = register_shrinker(&f2fs_shrinker_info);
1475 if (err)
1476 goto free_crypto;
1477
1478 err = register_filesystem(&f2fs_fs_type);
1479 if (err)
1480 goto free_shrinker;
1481 f2fs_create_root_stats();
1482 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1483 return 0;
1484
1485free_shrinker:
1486 unregister_shrinker(&f2fs_shrinker_info);
1487free_crypto:
1488 f2fs_exit_crypto();
1489free_kset:
1490 kset_unregister(f2fs_kset);
1491free_extent_cache:
1492 destroy_extent_cache();
1493free_checkpoint_caches:
1494 destroy_checkpoint_caches();
1495free_segment_manager_caches:
1496 destroy_segment_manager_caches();
1497free_node_manager_caches:
1498 destroy_node_manager_caches();
1499free_inodecache:
1500 destroy_inodecache();
1501fail:
1502 return err;
1503}
1504
1505static void __exit exit_f2fs_fs(void)
1506{
1507 remove_proc_entry("fs/f2fs", NULL);
1508 f2fs_destroy_root_stats();
1509 unregister_shrinker(&f2fs_shrinker_info);
1510 unregister_filesystem(&f2fs_fs_type);
1511 f2fs_exit_crypto();
1512 destroy_extent_cache();
1513 destroy_checkpoint_caches();
1514 destroy_segment_manager_caches();
1515 destroy_node_manager_caches();
1516 destroy_inodecache();
1517 kset_unregister(f2fs_kset);
1518 f2fs_destroy_trace_ios();
1519}
1520
1521module_init(init_f2fs_fs)
1522module_exit(exit_f2fs_fs)
1523
1524MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1525MODULE_DESCRIPTION("Flash Friendly File System");
1526MODULE_LICENSE("GPL");
1527
