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