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Linus Torvalds8005ecc2012-12-20 13:54:51 -08001/*
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
34#define CREATE_TRACE_POINTS
35#include <trace/events/f2fs.h>
36
37static struct proc_dir_entry *f2fs_proc_root;
38static struct kmem_cache *f2fs_inode_cachep;
39static struct kset *f2fs_kset;
40
41enum {
42 Opt_gc_background,
43 Opt_disable_roll_forward,
44 Opt_discard,
45 Opt_noheap,
46 Opt_user_xattr,
47 Opt_nouser_xattr,
48 Opt_acl,
49 Opt_noacl,
50 Opt_active_logs,
51 Opt_disable_ext_identify,
52 Opt_inline_xattr,
Changman Leeb1a94e82013-11-15 10:42:51 +090053 Opt_inline_data,
Linus Torvalds8005ecc2012-12-20 13:54:51 -080054 Opt_err,
55};
56
57static match_table_t f2fs_tokens = {
58 {Opt_gc_background, "background_gc=%s"},
59 {Opt_disable_roll_forward, "disable_roll_forward"},
60 {Opt_discard, "discard"},
61 {Opt_noheap, "no_heap"},
62 {Opt_user_xattr, "user_xattr"},
63 {Opt_nouser_xattr, "nouser_xattr"},
64 {Opt_acl, "acl"},
65 {Opt_noacl, "noacl"},
66 {Opt_active_logs, "active_logs=%u"},
67 {Opt_disable_ext_identify, "disable_ext_identify"},
68 {Opt_inline_xattr, "inline_xattr"},
Changman Leeb1a94e82013-11-15 10:42:51 +090069 {Opt_inline_data, "inline_data"},
Linus Torvalds8005ecc2012-12-20 13:54:51 -080070 {Opt_err, NULL},
71};
72
73/* Sysfs support for f2fs */
74enum {
75 GC_THREAD, /* struct f2fs_gc_thread */
76 SM_INFO, /* struct f2fs_sm_info */
Jaegeuk Kim327c57d2014-03-19 13:31:37 +090077 NM_INFO, /* struct f2fs_nm_info */
Changman Leeb1a94e82013-11-15 10:42:51 +090078 F2FS_SBI, /* struct f2fs_sb_info */
Linus Torvalds8005ecc2012-12-20 13:54:51 -080079};
80
81struct f2fs_attr {
82 struct attribute attr;
83 ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
84 ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
85 const char *, size_t);
86 int struct_type;
87 int offset;
88};
89
90static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
91{
92 if (struct_type == GC_THREAD)
93 return (unsigned char *)sbi->gc_thread;
94 else if (struct_type == SM_INFO)
95 return (unsigned char *)SM_I(sbi);
Jaegeuk Kim327c57d2014-03-19 13:31:37 +090096 else if (struct_type == NM_INFO)
97 return (unsigned char *)NM_I(sbi);
Changman Leeb1a94e82013-11-15 10:42:51 +090098 else if (struct_type == F2FS_SBI)
99 return (unsigned char *)sbi;
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800100 return NULL;
101}
102
103static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
104 struct f2fs_sb_info *sbi, char *buf)
105{
106 unsigned char *ptr = NULL;
107 unsigned int *ui;
108
109 ptr = __struct_ptr(sbi, a->struct_type);
110 if (!ptr)
111 return -EINVAL;
112
113 ui = (unsigned int *)(ptr + a->offset);
114
115 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
116}
117
118static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
119 struct f2fs_sb_info *sbi,
120 const char *buf, size_t count)
121{
122 unsigned char *ptr;
123 unsigned long t;
124 unsigned int *ui;
125 ssize_t ret;
126
127 ptr = __struct_ptr(sbi, a->struct_type);
128 if (!ptr)
129 return -EINVAL;
130
131 ui = (unsigned int *)(ptr + a->offset);
132
133 ret = kstrtoul(skip_spaces(buf), 0, &t);
134 if (ret < 0)
135 return ret;
136 *ui = t;
137 return count;
138}
139
140static ssize_t f2fs_attr_show(struct kobject *kobj,
141 struct attribute *attr, char *buf)
142{
143 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
144 s_kobj);
145 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
146
147 return a->show ? a->show(a, sbi, buf) : 0;
148}
149
150static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
151 const char *buf, size_t len)
152{
153 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
154 s_kobj);
155 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
156
157 return a->store ? a->store(a, sbi, buf, len) : 0;
158}
159
160static void f2fs_sb_release(struct kobject *kobj)
161{
162 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
163 s_kobj);
164 complete(&sbi->s_kobj_unregister);
165}
166
167#define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
168static struct f2fs_attr f2fs_attr_##_name = { \
169 .attr = {.name = __stringify(_name), .mode = _mode }, \
170 .show = _show, \
171 .store = _store, \
172 .struct_type = _struct_type, \
173 .offset = _offset \
174}
175
176#define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \
177 F2FS_ATTR_OFFSET(struct_type, name, 0644, \
178 f2fs_sbi_show, f2fs_sbi_store, \
179 offsetof(struct struct_name, elname))
180
181F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
182F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
183F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
184F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
185F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
Changman Leeb1a94e82013-11-15 10:42:51 +0900186F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
187F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
188F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
Jaegeuk Kim327c57d2014-03-19 13:31:37 +0900189F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
Changman Leeb1a94e82013-11-15 10:42:51 +0900190F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
Jaegeuk Kima753aba2014-02-27 20:09:05 +0900191F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800192
193#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
194static struct attribute *f2fs_attrs[] = {
195 ATTR_LIST(gc_min_sleep_time),
196 ATTR_LIST(gc_max_sleep_time),
197 ATTR_LIST(gc_no_gc_sleep_time),
198 ATTR_LIST(gc_idle),
199 ATTR_LIST(reclaim_segments),
Changman Leeb1a94e82013-11-15 10:42:51 +0900200 ATTR_LIST(max_small_discards),
201 ATTR_LIST(ipu_policy),
202 ATTR_LIST(min_ipu_util),
203 ATTR_LIST(max_victim_search),
Jaegeuk Kima753aba2014-02-27 20:09:05 +0900204 ATTR_LIST(dir_level),
Jaegeuk Kim327c57d2014-03-19 13:31:37 +0900205 ATTR_LIST(ram_thresh),
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800206 NULL,
207};
208
209static const struct sysfs_ops f2fs_attr_ops = {
210 .show = f2fs_attr_show,
211 .store = f2fs_attr_store,
212};
213
214static struct kobj_type f2fs_ktype = {
215 .default_attrs = f2fs_attrs,
216 .sysfs_ops = &f2fs_attr_ops,
217 .release = f2fs_sb_release,
218};
219
220void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
221{
222 struct va_format vaf;
223 va_list args;
224
225 va_start(args, fmt);
226 vaf.fmt = fmt;
227 vaf.va = &args;
228 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
229 va_end(args);
230}
231
232static void init_once(void *foo)
233{
234 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
235
236 inode_init_once(&fi->vfs_inode);
237}
238
239static int parse_options(struct super_block *sb, char *options)
240{
241 struct f2fs_sb_info *sbi = F2FS_SB(sb);
242 substring_t args[MAX_OPT_ARGS];
243 char *p, *name;
244 int arg = 0;
245
246 if (!options)
247 return 0;
248
249 while ((p = strsep(&options, ",")) != NULL) {
250 int token;
251 if (!*p)
252 continue;
253 /*
254 * Initialize args struct so we know whether arg was
255 * found; some options take optional arguments.
256 */
257 args[0].to = args[0].from = NULL;
258 token = match_token(p, f2fs_tokens, args);
259
260 switch (token) {
261 case Opt_gc_background:
262 name = match_strdup(&args[0]);
263
264 if (!name)
265 return -ENOMEM;
Chao Yu23f5a1e2014-03-18 09:07:59 +0800266 if (strlen(name) == 2 && !strncmp(name, "on", 2))
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800267 set_opt(sbi, BG_GC);
Chao Yu23f5a1e2014-03-18 09:07:59 +0800268 else if (strlen(name) == 3 && !strncmp(name, "off", 3))
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800269 clear_opt(sbi, BG_GC);
270 else {
271 kfree(name);
272 return -EINVAL;
273 }
274 kfree(name);
275 break;
276 case Opt_disable_roll_forward:
277 set_opt(sbi, DISABLE_ROLL_FORWARD);
278 break;
279 case Opt_discard:
280 set_opt(sbi, DISCARD);
281 break;
282 case Opt_noheap:
283 set_opt(sbi, NOHEAP);
284 break;
285#ifdef CONFIG_F2FS_FS_XATTR
286 case Opt_user_xattr:
287 set_opt(sbi, XATTR_USER);
288 break;
289 case Opt_nouser_xattr:
290 clear_opt(sbi, XATTR_USER);
291 break;
292 case Opt_inline_xattr:
293 set_opt(sbi, INLINE_XATTR);
294 break;
295#else
296 case Opt_user_xattr:
297 f2fs_msg(sb, KERN_INFO,
298 "user_xattr options not supported");
299 break;
300 case Opt_nouser_xattr:
301 f2fs_msg(sb, KERN_INFO,
302 "nouser_xattr options not supported");
303 break;
304 case Opt_inline_xattr:
305 f2fs_msg(sb, KERN_INFO,
306 "inline_xattr options not supported");
307 break;
308#endif
309#ifdef CONFIG_F2FS_FS_POSIX_ACL
310 case Opt_acl:
311 set_opt(sbi, POSIX_ACL);
312 break;
313 case Opt_noacl:
314 clear_opt(sbi, POSIX_ACL);
315 break;
316#else
317 case Opt_acl:
318 f2fs_msg(sb, KERN_INFO, "acl options not supported");
319 break;
320 case Opt_noacl:
321 f2fs_msg(sb, KERN_INFO, "noacl options not supported");
322 break;
323#endif
324 case Opt_active_logs:
325 if (args->from && match_int(args, &arg))
326 return -EINVAL;
327 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
328 return -EINVAL;
329 sbi->active_logs = arg;
330 break;
331 case Opt_disable_ext_identify:
332 set_opt(sbi, DISABLE_EXT_IDENTIFY);
333 break;
Changman Leeb1a94e82013-11-15 10:42:51 +0900334 case Opt_inline_data:
335 set_opt(sbi, INLINE_DATA);
336 break;
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800337 default:
338 f2fs_msg(sb, KERN_ERR,
339 "Unrecognized mount option \"%s\" or missing value",
340 p);
341 return -EINVAL;
342 }
343 }
344 return 0;
345}
346
347static struct inode *f2fs_alloc_inode(struct super_block *sb)
348{
349 struct f2fs_inode_info *fi;
350
Changman Leeb1a94e82013-11-15 10:42:51 +0900351 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800352 if (!fi)
353 return NULL;
354
355 init_once((void *) fi);
356
357 /* Initilize f2fs-specific inode info */
358 fi->vfs_inode.i_version = 1;
359 atomic_set(&fi->dirty_dents, 0);
360 fi->i_current_depth = 1;
361 fi->i_advise = 0;
362 rwlock_init(&fi->ext.ext_lock);
363
364 set_inode_flag(fi, FI_NEW_INODE);
365
366 if (test_opt(F2FS_SB(sb), INLINE_XATTR))
367 set_inode_flag(fi, FI_INLINE_XATTR);
368
Jaegeuk Kima753aba2014-02-27 20:09:05 +0900369 /* Will be used by directory only */
370 fi->i_dir_level = F2FS_SB(sb)->dir_level;
371
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800372 return &fi->vfs_inode;
373}
374
375static int f2fs_drop_inode(struct inode *inode)
376{
377 /*
378 * This is to avoid a deadlock condition like below.
379 * writeback_single_inode(inode)
380 * - f2fs_write_data_page
381 * - f2fs_gc -> iput -> evict
382 * - inode_wait_for_writeback(inode)
383 */
384 if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
385 return 0;
386 return generic_drop_inode(inode);
387}
388
389/*
390 * f2fs_dirty_inode() is called from __mark_inode_dirty()
391 *
392 * We should call set_dirty_inode to write the dirty inode through write_inode.
393 */
394static void f2fs_dirty_inode(struct inode *inode, int flags)
395{
396 set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
397}
398
399static void f2fs_i_callback(struct rcu_head *head)
400{
401 struct inode *inode = container_of(head, struct inode, i_rcu);
402 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
403}
404
405static void f2fs_destroy_inode(struct inode *inode)
406{
407 call_rcu(&inode->i_rcu, f2fs_i_callback);
408}
409
410static void f2fs_put_super(struct super_block *sb)
411{
412 struct f2fs_sb_info *sbi = F2FS_SB(sb);
413
414 if (sbi->s_proc) {
415 remove_proc_entry("segment_info", sbi->s_proc);
416 remove_proc_entry(sb->s_id, f2fs_proc_root);
417 }
418 kobject_del(&sbi->s_kobj);
419
420 f2fs_destroy_stats(sbi);
421 stop_gc_thread(sbi);
422
423 /* We don't need to do checkpoint when it's clean */
424 if (sbi->s_dirty && get_pages(sbi, F2FS_DIRTY_NODES))
425 write_checkpoint(sbi, true);
426
427 iput(sbi->node_inode);
428 iput(sbi->meta_inode);
429
430 /* destroy f2fs internal modules */
431 destroy_node_manager(sbi);
432 destroy_segment_manager(sbi);
433
434 kfree(sbi->ckpt);
435 kobject_put(&sbi->s_kobj);
436 wait_for_completion(&sbi->s_kobj_unregister);
437
438 sb->s_fs_info = NULL;
439 brelse(sbi->raw_super_buf);
440 kfree(sbi);
441}
442
443int f2fs_sync_fs(struct super_block *sb, int sync)
444{
445 struct f2fs_sb_info *sbi = F2FS_SB(sb);
446
447 trace_f2fs_sync_fs(sb, sync);
448
449 if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
450 return 0;
451
452 if (sync) {
453 mutex_lock(&sbi->gc_mutex);
454 write_checkpoint(sbi, false);
455 mutex_unlock(&sbi->gc_mutex);
456 } else {
457 f2fs_balance_fs(sbi);
458 }
459
460 return 0;
461}
462
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800463static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
464{
465 struct super_block *sb = dentry->d_sb;
466 struct f2fs_sb_info *sbi = F2FS_SB(sb);
467 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
468 block_t total_count, user_block_count, start_count, ovp_count;
469
470 total_count = le64_to_cpu(sbi->raw_super->block_count);
471 user_block_count = sbi->user_block_count;
472 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
473 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
474 buf->f_type = F2FS_SUPER_MAGIC;
475 buf->f_bsize = sbi->blocksize;
476
477 buf->f_blocks = total_count - start_count;
478 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
479 buf->f_bavail = user_block_count - valid_user_blocks(sbi);
480
481 buf->f_files = sbi->total_node_count;
482 buf->f_ffree = sbi->total_node_count - valid_inode_count(sbi);
483
484 buf->f_namelen = F2FS_NAME_LEN;
485 buf->f_fsid.val[0] = (u32)id;
486 buf->f_fsid.val[1] = (u32)(id >> 32);
487
488 return 0;
489}
490
491static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
492{
493 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
494
495 if (!(root->d_sb->s_flags & MS_RDONLY) && test_opt(sbi, BG_GC))
496 seq_printf(seq, ",background_gc=%s", "on");
497 else
498 seq_printf(seq, ",background_gc=%s", "off");
499 if (test_opt(sbi, DISABLE_ROLL_FORWARD))
500 seq_puts(seq, ",disable_roll_forward");
501 if (test_opt(sbi, DISCARD))
502 seq_puts(seq, ",discard");
503 if (test_opt(sbi, NOHEAP))
504 seq_puts(seq, ",no_heap_alloc");
505#ifdef CONFIG_F2FS_FS_XATTR
506 if (test_opt(sbi, XATTR_USER))
507 seq_puts(seq, ",user_xattr");
508 else
509 seq_puts(seq, ",nouser_xattr");
510 if (test_opt(sbi, INLINE_XATTR))
511 seq_puts(seq, ",inline_xattr");
512#endif
513#ifdef CONFIG_F2FS_FS_POSIX_ACL
514 if (test_opt(sbi, POSIX_ACL))
515 seq_puts(seq, ",acl");
516 else
517 seq_puts(seq, ",noacl");
518#endif
519 if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
520 seq_puts(seq, ",disable_ext_identify");
Changman Leeb1a94e82013-11-15 10:42:51 +0900521 if (test_opt(sbi, INLINE_DATA))
522 seq_puts(seq, ",inline_data");
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800523 seq_printf(seq, ",active_logs=%u", sbi->active_logs);
524
525 return 0;
526}
527
528static int segment_info_seq_show(struct seq_file *seq, void *offset)
529{
530 struct super_block *sb = seq->private;
531 struct f2fs_sb_info *sbi = F2FS_SB(sb);
Changman Leeb1a94e82013-11-15 10:42:51 +0900532 unsigned int total_segs =
533 le32_to_cpu(sbi->raw_super->segment_count_main);
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800534 int i;
535
Chao Yufee2a042014-03-17 10:31:06 +0800536 seq_puts(seq, "format: segment_type|valid_blocks\n"
537 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
538
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800539 for (i = 0; i < total_segs; i++) {
Chao Yufee2a042014-03-17 10:31:06 +0800540 struct seg_entry *se = get_seg_entry(sbi, i);
541
542 if ((i % 10) == 0)
543 seq_printf(seq, "%-5d", i);
544 seq_printf(seq, "%d|%-3u", se->type,
545 get_valid_blocks(sbi, i, 1));
Gu Zheng13039f62014-03-07 18:43:33 +0800546 if ((i % 10) == 9 || i == (total_segs - 1))
547 seq_putc(seq, '\n');
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800548 else
Gu Zheng13039f62014-03-07 18:43:33 +0800549 seq_putc(seq, ' ');
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800550 }
Gu Zheng13039f62014-03-07 18:43:33 +0800551
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800552 return 0;
553}
554
555static int segment_info_open_fs(struct inode *inode, struct file *file)
556{
Evan McClain1a808fb2014-03-20 09:12:16 -0400557 return single_open(file, segment_info_seq_show, PDE(inode)->data);
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800558}
559
560static const struct file_operations f2fs_seq_segment_info_fops = {
561 .owner = THIS_MODULE,
562 .open = segment_info_open_fs,
563 .read = seq_read,
564 .llseek = seq_lseek,
565 .release = single_release,
566};
567
568static int f2fs_remount(struct super_block *sb, int *flags, char *data)
569{
570 struct f2fs_sb_info *sbi = F2FS_SB(sb);
571 struct f2fs_mount_info org_mount_opt;
572 int err, active_logs;
573
574 /*
575 * Save the old mount options in case we
576 * need to restore them.
577 */
578 org_mount_opt = sbi->mount_opt;
579 active_logs = sbi->active_logs;
580
581 /* parse mount options */
582 err = parse_options(sb, data);
583 if (err)
584 goto restore_opts;
585
586 /*
587 * Previous and new state of filesystem is RO,
588 * so no point in checking GC conditions.
589 */
590 if ((sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY))
591 goto skip;
592
593 /*
594 * We stop the GC thread if FS is mounted as RO
595 * or if background_gc = off is passed in mount
596 * option. Also sync the filesystem.
597 */
598 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
599 if (sbi->gc_thread) {
600 stop_gc_thread(sbi);
601 f2fs_sync_fs(sb, 1);
602 }
603 } else if (test_opt(sbi, BG_GC) && !sbi->gc_thread) {
604 err = start_gc_thread(sbi);
605 if (err)
606 goto restore_opts;
607 }
608skip:
609 /* Update the POSIXACL Flag */
610 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
611 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
612 return 0;
613
614restore_opts:
615 sbi->mount_opt = org_mount_opt;
616 sbi->active_logs = active_logs;
617 return err;
618}
619
620static struct super_operations f2fs_sops = {
621 .alloc_inode = f2fs_alloc_inode,
622 .drop_inode = f2fs_drop_inode,
623 .destroy_inode = f2fs_destroy_inode,
624 .write_inode = f2fs_write_inode,
625 .dirty_inode = f2fs_dirty_inode,
626 .show_options = f2fs_show_options,
627 .evict_inode = f2fs_evict_inode,
628 .put_super = f2fs_put_super,
629 .sync_fs = f2fs_sync_fs,
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800630 .statfs = f2fs_statfs,
631 .remount_fs = f2fs_remount,
632};
633
634static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
635 u64 ino, u32 generation)
636{
637 struct f2fs_sb_info *sbi = F2FS_SB(sb);
638 struct inode *inode;
639
Changman Leeb1a94e82013-11-15 10:42:51 +0900640 if (unlikely(ino < F2FS_ROOT_INO(sbi)))
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800641 return ERR_PTR(-ESTALE);
Chao Yu4f9d66d2014-03-12 17:08:36 +0800642 if (unlikely(ino >= NM_I(sbi)->max_nid))
643 return ERR_PTR(-ESTALE);
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800644
645 /*
646 * f2fs_iget isn't quite right if the inode is currently unallocated!
647 * However f2fs_iget currently does appropriate checks to handle stale
648 * inodes so everything is OK.
649 */
650 inode = f2fs_iget(sb, ino);
651 if (IS_ERR(inode))
652 return ERR_CAST(inode);
Changman Leeb1a94e82013-11-15 10:42:51 +0900653 if (unlikely(generation && inode->i_generation != generation)) {
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800654 /* we didn't find the right inode.. */
655 iput(inode);
656 return ERR_PTR(-ESTALE);
657 }
658 return inode;
659}
660
661static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
662 int fh_len, int fh_type)
663{
664 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
665 f2fs_nfs_get_inode);
666}
667
668static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
669 int fh_len, int fh_type)
670{
671 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
672 f2fs_nfs_get_inode);
673}
674
675static const struct export_operations f2fs_export_ops = {
676 .fh_to_dentry = f2fs_fh_to_dentry,
677 .fh_to_parent = f2fs_fh_to_parent,
678 .get_parent = f2fs_get_parent,
679};
680
681static loff_t max_file_size(unsigned bits)
682{
683 loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
684 loff_t leaf_count = ADDRS_PER_BLOCK;
685
686 /* two direct node blocks */
687 result += (leaf_count * 2);
688
689 /* two indirect node blocks */
690 leaf_count *= NIDS_PER_BLOCK;
691 result += (leaf_count * 2);
692
693 /* one double indirect node block */
694 leaf_count *= NIDS_PER_BLOCK;
695 result += leaf_count;
696
697 result <<= bits;
698 return result;
699}
700
701static int sanity_check_raw_super(struct super_block *sb,
702 struct f2fs_super_block *raw_super)
703{
704 unsigned int blocksize;
705
706 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
707 f2fs_msg(sb, KERN_INFO,
708 "Magic Mismatch, valid(0x%x) - read(0x%x)",
709 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
710 return 1;
711 }
712
713 /* Currently, support only 4KB page cache size */
714 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
715 f2fs_msg(sb, KERN_INFO,
716 "Invalid page_cache_size (%lu), supports only 4KB\n",
717 PAGE_CACHE_SIZE);
718 return 1;
719 }
720
721 /* Currently, support only 4KB block size */
722 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
723 if (blocksize != F2FS_BLKSIZE) {
724 f2fs_msg(sb, KERN_INFO,
725 "Invalid blocksize (%u), supports only 4KB\n",
726 blocksize);
727 return 1;
728 }
729
730 if (le32_to_cpu(raw_super->log_sectorsize) !=
731 F2FS_LOG_SECTOR_SIZE) {
732 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize");
733 return 1;
734 }
735 if (le32_to_cpu(raw_super->log_sectors_per_block) !=
736 F2FS_LOG_SECTORS_PER_BLOCK) {
737 f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block");
738 return 1;
739 }
740 return 0;
741}
742
743static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
744{
745 unsigned int total, fsmeta;
746 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
747 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
748
749 total = le32_to_cpu(raw_super->segment_count);
750 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
751 fsmeta += le32_to_cpu(raw_super->segment_count_sit);
752 fsmeta += le32_to_cpu(raw_super->segment_count_nat);
753 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
754 fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
755
Changman Leeb1a94e82013-11-15 10:42:51 +0900756 if (unlikely(fsmeta >= total))
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800757 return 1;
758
Changman Leeb1a94e82013-11-15 10:42:51 +0900759 if (unlikely(is_set_ckpt_flags(ckpt, CP_ERROR_FLAG))) {
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800760 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
761 return 1;
762 }
763 return 0;
764}
765
766static void init_sb_info(struct f2fs_sb_info *sbi)
767{
768 struct f2fs_super_block *raw_super = sbi->raw_super;
769 int i;
770
771 sbi->log_sectors_per_block =
772 le32_to_cpu(raw_super->log_sectors_per_block);
773 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
774 sbi->blocksize = 1 << sbi->log_blocksize;
775 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
776 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
777 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
778 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
779 sbi->total_sections = le32_to_cpu(raw_super->section_count);
780 sbi->total_node_count =
781 (le32_to_cpu(raw_super->segment_count_nat) / 2)
782 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
783 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
784 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
785 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
786 sbi->cur_victim_sec = NULL_SECNO;
Changman Leeb1a94e82013-11-15 10:42:51 +0900787 sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800788
789 for (i = 0; i < NR_COUNT_TYPE; i++)
790 atomic_set(&sbi->nr_pages[i], 0);
Jaegeuk Kima753aba2014-02-27 20:09:05 +0900791
792 sbi->dir_level = DEF_DIR_LEVEL;
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800793}
794
795/*
796 * Read f2fs raw super block.
797 * Because we have two copies of super block, so read the first one at first,
798 * if the first one is invalid, move to read the second one.
799 */
800static int read_raw_super_block(struct super_block *sb,
801 struct f2fs_super_block **raw_super,
802 struct buffer_head **raw_super_buf)
803{
804 int block = 0;
805
806retry:
807 *raw_super_buf = sb_bread(sb, block);
808 if (!*raw_super_buf) {
809 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
810 block + 1);
811 if (block == 0) {
812 block++;
813 goto retry;
814 } else {
815 return -EIO;
816 }
817 }
818
819 *raw_super = (struct f2fs_super_block *)
820 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
821
822 /* sanity checking of raw super */
823 if (sanity_check_raw_super(sb, *raw_super)) {
824 brelse(*raw_super_buf);
Changman Leeb1a94e82013-11-15 10:42:51 +0900825 f2fs_msg(sb, KERN_ERR,
826 "Can't find valid F2FS filesystem in %dth superblock",
827 block + 1);
828 if (block == 0) {
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800829 block++;
830 goto retry;
831 } else {
832 return -EINVAL;
833 }
834 }
835
836 return 0;
837}
838
839static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
840{
841 struct f2fs_sb_info *sbi;
842 struct f2fs_super_block *raw_super;
843 struct buffer_head *raw_super_buf;
844 struct inode *root;
845 long err = -EINVAL;
Changman Leeb1a94e82013-11-15 10:42:51 +0900846 int i;
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800847
848 /* allocate memory for f2fs-specific super block info */
849 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
850 if (!sbi)
851 return -ENOMEM;
852
853 /* set a block size */
Changman Leeb1a94e82013-11-15 10:42:51 +0900854 if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800855 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
856 goto free_sbi;
857 }
858
859 err = read_raw_super_block(sb, &raw_super, &raw_super_buf);
860 if (err)
861 goto free_sbi;
862
863 sb->s_fs_info = sbi;
864 /* init some FS parameters */
865 sbi->active_logs = NR_CURSEG_TYPE;
866
867 set_opt(sbi, BG_GC);
868
869#ifdef CONFIG_F2FS_FS_XATTR
870 set_opt(sbi, XATTR_USER);
871#endif
872#ifdef CONFIG_F2FS_FS_POSIX_ACL
873 set_opt(sbi, POSIX_ACL);
874#endif
875 /* parse mount options */
876 err = parse_options(sb, (char *)data);
877 if (err)
878 goto free_sb_buf;
879
880 sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
881 sb->s_max_links = F2FS_LINK_MAX;
882 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
883
884 sb->s_op = &f2fs_sops;
885 sb->s_xattr = f2fs_xattr_handlers;
886 sb->s_export_op = &f2fs_export_ops;
887 sb->s_magic = F2FS_SUPER_MAGIC;
888 sb->s_time_gran = 1;
889 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
890 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
891 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
892
893 /* init f2fs-specific super block info */
894 sbi->sb = sb;
895 sbi->raw_super = raw_super;
896 sbi->raw_super_buf = raw_super_buf;
897 mutex_init(&sbi->gc_mutex);
898 mutex_init(&sbi->writepages);
899 mutex_init(&sbi->cp_mutex);
900 mutex_init(&sbi->node_write);
901 sbi->por_doing = false;
902 spin_lock_init(&sbi->stat_lock);
Changman Leeb1a94e82013-11-15 10:42:51 +0900903
904 mutex_init(&sbi->read_io.io_mutex);
905 sbi->read_io.sbi = sbi;
906 sbi->read_io.bio = NULL;
907 for (i = 0; i < NR_PAGE_TYPE; i++) {
908 mutex_init(&sbi->write_io[i].io_mutex);
909 sbi->write_io[i].sbi = sbi;
910 sbi->write_io[i].bio = NULL;
911 }
912
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800913 init_rwsem(&sbi->cp_rwsem);
914 init_waitqueue_head(&sbi->cp_wait);
915 init_sb_info(sbi);
916
917 /* get an inode for meta space */
918 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
919 if (IS_ERR(sbi->meta_inode)) {
920 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
921 err = PTR_ERR(sbi->meta_inode);
922 goto free_sb_buf;
923 }
924
925 err = get_valid_checkpoint(sbi);
926 if (err) {
927 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
928 goto free_meta_inode;
929 }
930
931 /* sanity checking of checkpoint */
932 err = -EINVAL;
933 if (sanity_check_ckpt(sbi)) {
934 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
935 goto free_cp;
936 }
937
938 sbi->total_valid_node_count =
939 le32_to_cpu(sbi->ckpt->valid_node_count);
940 sbi->total_valid_inode_count =
941 le32_to_cpu(sbi->ckpt->valid_inode_count);
942 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
943 sbi->total_valid_block_count =
944 le64_to_cpu(sbi->ckpt->valid_block_count);
945 sbi->last_valid_block_count = sbi->total_valid_block_count;
946 sbi->alloc_valid_block_count = 0;
947 INIT_LIST_HEAD(&sbi->dir_inode_list);
948 spin_lock_init(&sbi->dir_inode_lock);
949
950 init_orphan_info(sbi);
951
952 /* setup f2fs internal modules */
953 err = build_segment_manager(sbi);
954 if (err) {
955 f2fs_msg(sb, KERN_ERR,
956 "Failed to initialize F2FS segment manager");
957 goto free_sm;
958 }
959 err = build_node_manager(sbi);
960 if (err) {
961 f2fs_msg(sb, KERN_ERR,
962 "Failed to initialize F2FS node manager");
963 goto free_nm;
964 }
965
966 build_gc_manager(sbi);
967
968 /* get an inode for node space */
969 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
970 if (IS_ERR(sbi->node_inode)) {
971 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
972 err = PTR_ERR(sbi->node_inode);
973 goto free_nm;
974 }
975
976 /* if there are nt orphan nodes free them */
Changman Leeb1a94e82013-11-15 10:42:51 +0900977 recover_orphan_inodes(sbi);
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800978
979 /* read root inode and dentry */
980 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
981 if (IS_ERR(root)) {
982 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
983 err = PTR_ERR(root);
984 goto free_node_inode;
985 }
Changman Leeb1a94e82013-11-15 10:42:51 +0900986 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
987 err = -EINVAL;
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800988 goto free_root_inode;
Changman Leeb1a94e82013-11-15 10:42:51 +0900989 }
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800990
991 sb->s_root = d_make_root(root); /* allocate root dentry */
992 if (!sb->s_root) {
993 err = -ENOMEM;
994 goto free_root_inode;
995 }
996
Linus Torvalds8005ecc2012-12-20 13:54:51 -0800997 err = f2fs_build_stats(sbi);
998 if (err)
Jaegeuk Kim07264102014-02-19 18:23:32 +0900999 goto free_root_inode;
Linus Torvalds8005ecc2012-12-20 13:54:51 -08001000
1001 if (f2fs_proc_root)
1002 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1003
1004 if (sbi->s_proc)
1005 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1006 &f2fs_seq_segment_info_fops, sb);
1007
1008 if (test_opt(sbi, DISCARD)) {
1009 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1010 if (!blk_queue_discard(q))
1011 f2fs_msg(sb, KERN_WARNING,
1012 "mounting with \"discard\" option, but "
1013 "the device does not support discard");
1014 }
1015
1016 sbi->s_kobj.kset = f2fs_kset;
1017 init_completion(&sbi->s_kobj_unregister);
1018 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1019 "%s", sb->s_id);
1020 if (err)
Jaegeuk Kim07264102014-02-19 18:23:32 +09001021 goto free_proc;
Linus Torvalds8005ecc2012-12-20 13:54:51 -08001022
Jaegeuk Kim07264102014-02-19 18:23:32 +09001023 /* recover fsynced data */
1024 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1025 err = recover_fsync_data(sbi);
1026 if (err)
1027 f2fs_msg(sb, KERN_ERR,
1028 "Cannot recover all fsync data errno=%ld", err);
1029 }
1030
1031 /*
1032 * If filesystem is not mounted as read-only then
1033 * do start the gc_thread.
1034 */
1035 if (!(sb->s_flags & MS_RDONLY)) {
1036 /* After POR, we can run background GC thread.*/
1037 err = start_gc_thread(sbi);
1038 if (err)
1039 goto free_kobj;
1040 }
Linus Torvalds8005ecc2012-12-20 13:54:51 -08001041 return 0;
Jaegeuk Kim07264102014-02-19 18:23:32 +09001042
1043free_kobj:
1044 kobject_del(&sbi->s_kobj);
1045free_proc:
Linus Torvalds8005ecc2012-12-20 13:54:51 -08001046 if (sbi->s_proc) {
1047 remove_proc_entry("segment_info", sbi->s_proc);
1048 remove_proc_entry(sb->s_id, f2fs_proc_root);
1049 }
1050 f2fs_destroy_stats(sbi);
Linus Torvalds8005ecc2012-12-20 13:54:51 -08001051free_root_inode:
1052 dput(sb->s_root);
1053 sb->s_root = NULL;
1054free_node_inode:
1055 iput(sbi->node_inode);
1056free_nm:
1057 destroy_node_manager(sbi);
1058free_sm:
1059 destroy_segment_manager(sbi);
1060free_cp:
1061 kfree(sbi->ckpt);
1062free_meta_inode:
1063 make_bad_inode(sbi->meta_inode);
1064 iput(sbi->meta_inode);
1065free_sb_buf:
1066 brelse(raw_super_buf);
1067free_sbi:
1068 kfree(sbi);
1069 return err;
1070}
1071
1072static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1073 const char *dev_name, void *data)
1074{
1075 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1076}
1077
1078static struct file_system_type f2fs_fs_type = {
1079 .owner = THIS_MODULE,
1080 .name = "f2fs",
1081 .mount = f2fs_mount,
1082 .kill_sb = kill_block_super,
1083 .fs_flags = FS_REQUIRES_DEV,
1084};
1085
1086static int __init init_inodecache(void)
1087{
1088 f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
Gu Zhenge33dcea2014-03-07 18:43:28 +08001089 sizeof(struct f2fs_inode_info));
Changman Leeb1a94e82013-11-15 10:42:51 +09001090 if (!f2fs_inode_cachep)
Linus Torvalds8005ecc2012-12-20 13:54:51 -08001091 return -ENOMEM;
1092 return 0;
1093}
1094
1095static void destroy_inodecache(void)
1096{
1097 /*
1098 * Make sure all delayed rcu free inodes are flushed before we
1099 * destroy cache.
1100 */
1101 rcu_barrier();
1102 kmem_cache_destroy(f2fs_inode_cachep);
1103}
1104
1105static int __init init_f2fs_fs(void)
1106{
1107 int err;
1108
1109 err = init_inodecache();
1110 if (err)
1111 goto fail;
1112 err = create_node_manager_caches();
1113 if (err)
1114 goto free_inodecache;
Changman Leeb1a94e82013-11-15 10:42:51 +09001115 err = create_segment_manager_caches();
Linus Torvalds8005ecc2012-12-20 13:54:51 -08001116 if (err)
1117 goto free_node_manager_caches;
Changman Leeb1a94e82013-11-15 10:42:51 +09001118 err = create_gc_caches();
1119 if (err)
1120 goto free_segment_manager_caches;
Linus Torvalds8005ecc2012-12-20 13:54:51 -08001121 err = create_checkpoint_caches();
1122 if (err)
1123 goto free_gc_caches;
1124 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1125 if (!f2fs_kset) {
1126 err = -ENOMEM;
1127 goto free_checkpoint_caches;
1128 }
1129 err = register_filesystem(&f2fs_fs_type);
1130 if (err)
1131 goto free_kset;
1132 f2fs_create_root_stats();
1133 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1134 return 0;
1135
1136free_kset:
1137 kset_unregister(f2fs_kset);
1138free_checkpoint_caches:
1139 destroy_checkpoint_caches();
1140free_gc_caches:
1141 destroy_gc_caches();
Changman Leeb1a94e82013-11-15 10:42:51 +09001142free_segment_manager_caches:
1143 destroy_segment_manager_caches();
Linus Torvalds8005ecc2012-12-20 13:54:51 -08001144free_node_manager_caches:
1145 destroy_node_manager_caches();
1146free_inodecache:
1147 destroy_inodecache();
1148fail:
1149 return err;
1150}
1151
1152static void __exit exit_f2fs_fs(void)
1153{
1154 remove_proc_entry("fs/f2fs", NULL);
1155 f2fs_destroy_root_stats();
1156 unregister_filesystem(&f2fs_fs_type);
1157 destroy_checkpoint_caches();
1158 destroy_gc_caches();
Changman Leeb1a94e82013-11-15 10:42:51 +09001159 destroy_segment_manager_caches();
Linus Torvalds8005ecc2012-12-20 13:54:51 -08001160 destroy_node_manager_caches();
1161 destroy_inodecache();
1162 kset_unregister(f2fs_kset);
1163}
1164
1165module_init(init_f2fs_fs)
1166module_exit(exit_f2fs_fs)
1167
1168MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1169MODULE_DESCRIPTION("Flash Friendly File System");
1170MODULE_LICENSE("GPL");