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ARM: pmu: add support for interrupt-affinity property
[linux/fpc-iii.git] / fs / f2fs / super.c
blobf2fe666a6ea995a29d5aee3f228acaf75e6cf85a
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, batched_trim_sections, trim_sections);
199 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
200 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
201 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
202 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
203 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
204 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
205
206 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
207 static struct attribute *f2fs_attrs[] = {
208 ATTR_LIST(gc_min_sleep_time),
209 ATTR_LIST(gc_max_sleep_time),
210 ATTR_LIST(gc_no_gc_sleep_time),
211 ATTR_LIST(gc_idle),
212 ATTR_LIST(reclaim_segments),
213 ATTR_LIST(max_small_discards),
214 ATTR_LIST(batched_trim_sections),
215 ATTR_LIST(ipu_policy),
216 ATTR_LIST(min_ipu_util),
217 ATTR_LIST(min_fsync_blocks),
218 ATTR_LIST(max_victim_search),
219 ATTR_LIST(dir_level),
220 ATTR_LIST(ram_thresh),
221 NULL,
222 };
223
224 static const struct sysfs_ops f2fs_attr_ops = {
225 .show = f2fs_attr_show,
226 .store = f2fs_attr_store,
227 };
228
229 static struct kobj_type f2fs_ktype = {
230 .default_attrs = f2fs_attrs,
231 .sysfs_ops = &f2fs_attr_ops,
232 .release = f2fs_sb_release,
233 };
234
235 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
236 {
237 struct va_format vaf;
238 va_list args;
239
240 va_start(args, fmt);
241 vaf.fmt = fmt;
242 vaf.va = &args;
243 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
244 va_end(args);
245 }
246
247 static void init_once(void *foo)
248 {
249 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
250
251 inode_init_once(&fi->vfs_inode);
252 }
253
254 static int parse_options(struct super_block *sb, char *options)
255 {
256 struct f2fs_sb_info *sbi = F2FS_SB(sb);
257 substring_t args[MAX_OPT_ARGS];
258 char *p, *name;
259 int arg = 0;
260
261 if (!options)
262 return 0;
263
264 while ((p = strsep(&options, ",")) != NULL) {
265 int token;
266 if (!*p)
267 continue;
268 /*
269 * Initialize args struct so we know whether arg was
270 * found; some options take optional arguments.
271 */
272 args[0].to = args[0].from = NULL;
273 token = match_token(p, f2fs_tokens, args);
274
275 switch (token) {
276 case Opt_gc_background:
277 name = match_strdup(&args[0]);
278
279 if (!name)
280 return -ENOMEM;
281 if (strlen(name) == 2 && !strncmp(name, "on", 2))
282 set_opt(sbi, BG_GC);
283 else if (strlen(name) == 3 && !strncmp(name, "off", 3))
284 clear_opt(sbi, BG_GC);
285 else {
286 kfree(name);
287 return -EINVAL;
288 }
289 kfree(name);
290 break;
291 case Opt_disable_roll_forward:
292 set_opt(sbi, DISABLE_ROLL_FORWARD);
293 break;
294 case Opt_norecovery:
295 /* this option mounts f2fs with ro */
296 set_opt(sbi, DISABLE_ROLL_FORWARD);
297 if (!f2fs_readonly(sb))
298 return -EINVAL;
299 break;
300 case Opt_discard:
301 set_opt(sbi, DISCARD);
302 break;
303 case Opt_noheap:
304 set_opt(sbi, NOHEAP);
305 break;
306 #ifdef CONFIG_F2FS_FS_XATTR
307 case Opt_user_xattr:
308 set_opt(sbi, XATTR_USER);
309 break;
310 case Opt_nouser_xattr:
311 clear_opt(sbi, XATTR_USER);
312 break;
313 case Opt_inline_xattr:
314 set_opt(sbi, INLINE_XATTR);
315 break;
316 #else
317 case Opt_user_xattr:
318 f2fs_msg(sb, KERN_INFO,
319 "user_xattr options not supported");
320 break;
321 case Opt_nouser_xattr:
322 f2fs_msg(sb, KERN_INFO,
323 "nouser_xattr options not supported");
324 break;
325 case Opt_inline_xattr:
326 f2fs_msg(sb, KERN_INFO,
327 "inline_xattr options not supported");
328 break;
329 #endif
330 #ifdef CONFIG_F2FS_FS_POSIX_ACL
331 case Opt_acl:
332 set_opt(sbi, POSIX_ACL);
333 break;
334 case Opt_noacl:
335 clear_opt(sbi, POSIX_ACL);
336 break;
337 #else
338 case Opt_acl:
339 f2fs_msg(sb, KERN_INFO, "acl options not supported");
340 break;
341 case Opt_noacl:
342 f2fs_msg(sb, KERN_INFO, "noacl options not supported");
343 break;
344 #endif
345 case Opt_active_logs:
346 if (args->from && match_int(args, &arg))
347 return -EINVAL;
348 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
349 return -EINVAL;
350 sbi->active_logs = arg;
351 break;
352 case Opt_disable_ext_identify:
353 set_opt(sbi, DISABLE_EXT_IDENTIFY);
354 break;
355 case Opt_inline_data:
356 set_opt(sbi, INLINE_DATA);
357 break;
358 case Opt_inline_dentry:
359 set_opt(sbi, INLINE_DENTRY);
360 break;
361 case Opt_flush_merge:
362 set_opt(sbi, FLUSH_MERGE);
363 break;
364 case Opt_nobarrier:
365 set_opt(sbi, NOBARRIER);
366 break;
367 case Opt_fastboot:
368 set_opt(sbi, FASTBOOT);
369 break;
370 default:
371 f2fs_msg(sb, KERN_ERR,
372 "Unrecognized mount option \"%s\" or missing value",
373 p);
374 return -EINVAL;
375 }
376 }
377 return 0;
378 }
379
380 static struct inode *f2fs_alloc_inode(struct super_block *sb)
381 {
382 struct f2fs_inode_info *fi;
383
384 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
385 if (!fi)
386 return NULL;
387
388 init_once((void *) fi);
389
390 /* Initialize f2fs-specific inode info */
391 fi->vfs_inode.i_version = 1;
392 atomic_set(&fi->dirty_pages, 0);
393 fi->i_current_depth = 1;
394 fi->i_advise = 0;
395 rwlock_init(&fi->ext.ext_lock);
396 init_rwsem(&fi->i_sem);
397 INIT_RADIX_TREE(&fi->inmem_root, GFP_NOFS);
398 INIT_LIST_HEAD(&fi->inmem_pages);
399 mutex_init(&fi->inmem_lock);
400
401 set_inode_flag(fi, FI_NEW_INODE);
402
403 if (test_opt(F2FS_SB(sb), INLINE_XATTR))
404 set_inode_flag(fi, FI_INLINE_XATTR);
405
406 /* Will be used by directory only */
407 fi->i_dir_level = F2FS_SB(sb)->dir_level;
408
409 return &fi->vfs_inode;
410 }
411
412 static int f2fs_drop_inode(struct inode *inode)
413 {
414 /*
415 * This is to avoid a deadlock condition like below.
416 * writeback_single_inode(inode)
417 * - f2fs_write_data_page
418 * - f2fs_gc -> iput -> evict
419 * - inode_wait_for_writeback(inode)
420 */
421 if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
422 return 0;
423 return generic_drop_inode(inode);
424 }
425
426 /*
427 * f2fs_dirty_inode() is called from __mark_inode_dirty()
428 *
429 * We should call set_dirty_inode to write the dirty inode through write_inode.
430 */
431 static void f2fs_dirty_inode(struct inode *inode, int flags)
432 {
433 set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
434 }
435
436 static void f2fs_i_callback(struct rcu_head *head)
437 {
438 struct inode *inode = container_of(head, struct inode, i_rcu);
439 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
440 }
441
442 static void f2fs_destroy_inode(struct inode *inode)
443 {
444 call_rcu(&inode->i_rcu, f2fs_i_callback);
445 }
446
447 static void f2fs_put_super(struct super_block *sb)
448 {
449 struct f2fs_sb_info *sbi = F2FS_SB(sb);
450
451 if (sbi->s_proc) {
452 remove_proc_entry("segment_info", sbi->s_proc);
453 remove_proc_entry(sb->s_id, f2fs_proc_root);
454 }
455 kobject_del(&sbi->s_kobj);
456
457 f2fs_destroy_stats(sbi);
458 stop_gc_thread(sbi);
459
460 /*
461 * We don't need to do checkpoint when superblock is clean.
462 * But, the previous checkpoint was not done by umount, it needs to do
463 * clean checkpoint again.
464 */
465 if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
466 !is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) {
467 struct cp_control cpc = {
468 .reason = CP_UMOUNT,
469 };
470 write_checkpoint(sbi, &cpc);
471 }
472
473 /*
474 * normally superblock is clean, so we need to release this.
475 * In addition, EIO will skip do checkpoint, we need this as well.
476 */
477 release_dirty_inode(sbi);
478 release_discard_addrs(sbi);
479
480 iput(sbi->node_inode);
481 iput(sbi->meta_inode);
482
483 /* destroy f2fs internal modules */
484 destroy_node_manager(sbi);
485 destroy_segment_manager(sbi);
486
487 kfree(sbi->ckpt);
488 kobject_put(&sbi->s_kobj);
489 wait_for_completion(&sbi->s_kobj_unregister);
490
491 sb->s_fs_info = NULL;
492 brelse(sbi->raw_super_buf);
493 kfree(sbi);
494 }
495
496 int f2fs_sync_fs(struct super_block *sb, int sync)
497 {
498 struct f2fs_sb_info *sbi = F2FS_SB(sb);
499
500 trace_f2fs_sync_fs(sb, sync);
501
502 if (sync) {
503 struct cp_control cpc;
504
505 cpc.reason = __get_cp_reason(sbi);
506
507 mutex_lock(&sbi->gc_mutex);
508 write_checkpoint(sbi, &cpc);
509 mutex_unlock(&sbi->gc_mutex);
510 } else {
511 f2fs_balance_fs(sbi);
512 }
513 f2fs_trace_ios(NULL, NULL, 1);
514
515 return 0;
516 }
517
518 static int f2fs_freeze(struct super_block *sb)
519 {
520 int err;
521
522 if (f2fs_readonly(sb))
523 return 0;
524
525 err = f2fs_sync_fs(sb, 1);
526 return err;
527 }
528
529 static int f2fs_unfreeze(struct super_block *sb)
530 {
531 return 0;
532 }
533
534 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
535 {
536 struct super_block *sb = dentry->d_sb;
537 struct f2fs_sb_info *sbi = F2FS_SB(sb);
538 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
539 block_t total_count, user_block_count, start_count, ovp_count;
540
541 total_count = le64_to_cpu(sbi->raw_super->block_count);
542 user_block_count = sbi->user_block_count;
543 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
544 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
545 buf->f_type = F2FS_SUPER_MAGIC;
546 buf->f_bsize = sbi->blocksize;
547
548 buf->f_blocks = total_count - start_count;
549 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
550 buf->f_bavail = user_block_count - valid_user_blocks(sbi);
551
552 buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
553 buf->f_ffree = buf->f_files - valid_inode_count(sbi);
554
555 buf->f_namelen = F2FS_NAME_LEN;
556 buf->f_fsid.val[0] = (u32)id;
557 buf->f_fsid.val[1] = (u32)(id >> 32);
558
559 return 0;
560 }
561
562 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
563 {
564 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
565
566 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC))
567 seq_printf(seq, ",background_gc=%s", "on");
568 else
569 seq_printf(seq, ",background_gc=%s", "off");
570 if (test_opt(sbi, DISABLE_ROLL_FORWARD))
571 seq_puts(seq, ",disable_roll_forward");
572 if (test_opt(sbi, DISCARD))
573 seq_puts(seq, ",discard");
574 if (test_opt(sbi, NOHEAP))
575 seq_puts(seq, ",no_heap_alloc");
576 #ifdef CONFIG_F2FS_FS_XATTR
577 if (test_opt(sbi, XATTR_USER))
578 seq_puts(seq, ",user_xattr");
579 else
580 seq_puts(seq, ",nouser_xattr");
581 if (test_opt(sbi, INLINE_XATTR))
582 seq_puts(seq, ",inline_xattr");
583 #endif
584 #ifdef CONFIG_F2FS_FS_POSIX_ACL
585 if (test_opt(sbi, POSIX_ACL))
586 seq_puts(seq, ",acl");
587 else
588 seq_puts(seq, ",noacl");
589 #endif
590 if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
591 seq_puts(seq, ",disable_ext_identify");
592 if (test_opt(sbi, INLINE_DATA))
593 seq_puts(seq, ",inline_data");
594 if (test_opt(sbi, INLINE_DENTRY))
595 seq_puts(seq, ",inline_dentry");
596 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
597 seq_puts(seq, ",flush_merge");
598 if (test_opt(sbi, NOBARRIER))
599 seq_puts(seq, ",nobarrier");
600 if (test_opt(sbi, FASTBOOT))
601 seq_puts(seq, ",fastboot");
602 seq_printf(seq, ",active_logs=%u", sbi->active_logs);
603
604 return 0;
605 }
606
607 static int segment_info_seq_show(struct seq_file *seq, void *offset)
608 {
609 struct super_block *sb = seq->private;
610 struct f2fs_sb_info *sbi = F2FS_SB(sb);
611 unsigned int total_segs =
612 le32_to_cpu(sbi->raw_super->segment_count_main);
613 int i;
614
615 seq_puts(seq, "format: segment_type|valid_blocks\n"
616 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
617
618 for (i = 0; i < total_segs; i++) {
619 struct seg_entry *se = get_seg_entry(sbi, i);
620
621 if ((i % 10) == 0)
622 seq_printf(seq, "%-5d", i);
623 seq_printf(seq, "%d|%-3u", se->type,
624 get_valid_blocks(sbi, i, 1));
625 if ((i % 10) == 9 || i == (total_segs - 1))
626 seq_putc(seq, '\n');
627 else
628 seq_putc(seq, ' ');
629 }
630
631 return 0;
632 }
633
634 static int segment_info_open_fs(struct inode *inode, struct file *file)
635 {
636 return single_open(file, segment_info_seq_show, PDE_DATA(inode));
637 }
638
639 static const struct file_operations f2fs_seq_segment_info_fops = {
640 .owner = THIS_MODULE,
641 .open = segment_info_open_fs,
642 .read = seq_read,
643 .llseek = seq_lseek,
644 .release = single_release,
645 };
646
647 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
648 {
649 struct f2fs_sb_info *sbi = F2FS_SB(sb);
650 struct f2fs_mount_info org_mount_opt;
651 int err, active_logs;
652 bool need_restart_gc = false;
653 bool need_stop_gc = false;
654
655 sync_filesystem(sb);
656
657 /*
658 * Save the old mount options in case we
659 * need to restore them.
660 */
661 org_mount_opt = sbi->mount_opt;
662 active_logs = sbi->active_logs;
663
664 sbi->mount_opt.opt = 0;
665 sbi->active_logs = NR_CURSEG_TYPE;
666
667 /* parse mount options */
668 err = parse_options(sb, data);
669 if (err)
670 goto restore_opts;
671
672 /*
673 * Previous and new state of filesystem is RO,
674 * so skip checking GC and FLUSH_MERGE conditions.
675 */
676 if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
677 goto skip;
678
679 /*
680 * We stop the GC thread if FS is mounted as RO
681 * or if background_gc = off is passed in mount
682 * option. Also sync the filesystem.
683 */
684 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
685 if (sbi->gc_thread) {
686 stop_gc_thread(sbi);
687 f2fs_sync_fs(sb, 1);
688 need_restart_gc = true;
689 }
690 } else if (!sbi->gc_thread) {
691 err = start_gc_thread(sbi);
692 if (err)
693 goto restore_opts;
694 need_stop_gc = true;
695 }
696
697 /*
698 * We stop issue flush thread if FS is mounted as RO
699 * or if flush_merge is not passed in mount option.
700 */
701 if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
702 destroy_flush_cmd_control(sbi);
703 } else if (!SM_I(sbi)->cmd_control_info) {
704 err = create_flush_cmd_control(sbi);
705 if (err)
706 goto restore_gc;
707 }
708 skip:
709 /* Update the POSIXACL Flag */
710 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
711 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
712 return 0;
713 restore_gc:
714 if (need_restart_gc) {
715 if (start_gc_thread(sbi))
716 f2fs_msg(sbi->sb, KERN_WARNING,
717 "background gc thread has stopped");
718 } else if (need_stop_gc) {
719 stop_gc_thread(sbi);
720 }
721 restore_opts:
722 sbi->mount_opt = org_mount_opt;
723 sbi->active_logs = active_logs;
724 return err;
725 }
726
727 static struct super_operations f2fs_sops = {
728 .alloc_inode = f2fs_alloc_inode,
729 .drop_inode = f2fs_drop_inode,
730 .destroy_inode = f2fs_destroy_inode,
731 .write_inode = f2fs_write_inode,
732 .dirty_inode = f2fs_dirty_inode,
733 .show_options = f2fs_show_options,
734 .evict_inode = f2fs_evict_inode,
735 .put_super = f2fs_put_super,
736 .sync_fs = f2fs_sync_fs,
737 .freeze_fs = f2fs_freeze,
738 .unfreeze_fs = f2fs_unfreeze,
739 .statfs = f2fs_statfs,
740 .remount_fs = f2fs_remount,
741 };
742
743 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
744 u64 ino, u32 generation)
745 {
746 struct f2fs_sb_info *sbi = F2FS_SB(sb);
747 struct inode *inode;
748
749 if (check_nid_range(sbi, ino))
750 return ERR_PTR(-ESTALE);
751
752 /*
753 * f2fs_iget isn't quite right if the inode is currently unallocated!
754 * However f2fs_iget currently does appropriate checks to handle stale
755 * inodes so everything is OK.
756 */
757 inode = f2fs_iget(sb, ino);
758 if (IS_ERR(inode))
759 return ERR_CAST(inode);
760 if (unlikely(generation && inode->i_generation != generation)) {
761 /* we didn't find the right inode.. */
762 iput(inode);
763 return ERR_PTR(-ESTALE);
764 }
765 return inode;
766 }
767
768 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
769 int fh_len, int fh_type)
770 {
771 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
772 f2fs_nfs_get_inode);
773 }
774
775 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
776 int fh_len, int fh_type)
777 {
778 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
779 f2fs_nfs_get_inode);
780 }
781
782 static const struct export_operations f2fs_export_ops = {
783 .fh_to_dentry = f2fs_fh_to_dentry,
784 .fh_to_parent = f2fs_fh_to_parent,
785 .get_parent = f2fs_get_parent,
786 };
787
788 static loff_t max_file_size(unsigned bits)
789 {
790 loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
791 loff_t leaf_count = ADDRS_PER_BLOCK;
792
793 /* two direct node blocks */
794 result += (leaf_count * 2);
795
796 /* two indirect node blocks */
797 leaf_count *= NIDS_PER_BLOCK;
798 result += (leaf_count * 2);
799
800 /* one double indirect node block */
801 leaf_count *= NIDS_PER_BLOCK;
802 result += leaf_count;
803
804 result <<= bits;
805 return result;
806 }
807
808 static int sanity_check_raw_super(struct super_block *sb,
809 struct f2fs_super_block *raw_super)
810 {
811 unsigned int blocksize;
812
813 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
814 f2fs_msg(sb, KERN_INFO,
815 "Magic Mismatch, valid(0x%x) - read(0x%x)",
816 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
817 return 1;
818 }
819
820 /* Currently, support only 4KB page cache size */
821 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
822 f2fs_msg(sb, KERN_INFO,
823 "Invalid page_cache_size (%lu), supports only 4KB\n",
824 PAGE_CACHE_SIZE);
825 return 1;
826 }
827
828 /* Currently, support only 4KB block size */
829 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
830 if (blocksize != F2FS_BLKSIZE) {
831 f2fs_msg(sb, KERN_INFO,
832 "Invalid blocksize (%u), supports only 4KB\n",
833 blocksize);
834 return 1;
835 }
836
837 /* Currently, support 512/1024/2048/4096 bytes sector size */
838 if (le32_to_cpu(raw_super->log_sectorsize) >
839 F2FS_MAX_LOG_SECTOR_SIZE ||
840 le32_to_cpu(raw_super->log_sectorsize) <
841 F2FS_MIN_LOG_SECTOR_SIZE) {
842 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)",
843 le32_to_cpu(raw_super->log_sectorsize));
844 return 1;
845 }
846 if (le32_to_cpu(raw_super->log_sectors_per_block) +
847 le32_to_cpu(raw_super->log_sectorsize) !=
848 F2FS_MAX_LOG_SECTOR_SIZE) {
849 f2fs_msg(sb, KERN_INFO,
850 "Invalid log sectors per block(%u) log sectorsize(%u)",
851 le32_to_cpu(raw_super->log_sectors_per_block),
852 le32_to_cpu(raw_super->log_sectorsize));
853 return 1;
854 }
855 return 0;
856 }
857
858 static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
859 {
860 unsigned int total, fsmeta;
861 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
862 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
863
864 total = le32_to_cpu(raw_super->segment_count);
865 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
866 fsmeta += le32_to_cpu(raw_super->segment_count_sit);
867 fsmeta += le32_to_cpu(raw_super->segment_count_nat);
868 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
869 fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
870
871 if (unlikely(fsmeta >= total))
872 return 1;
873
874 if (unlikely(f2fs_cp_error(sbi))) {
875 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
876 return 1;
877 }
878 return 0;
879 }
880
881 static void init_sb_info(struct f2fs_sb_info *sbi)
882 {
883 struct f2fs_super_block *raw_super = sbi->raw_super;
884 int i;
885
886 sbi->log_sectors_per_block =
887 le32_to_cpu(raw_super->log_sectors_per_block);
888 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
889 sbi->blocksize = 1 << sbi->log_blocksize;
890 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
891 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
892 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
893 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
894 sbi->total_sections = le32_to_cpu(raw_super->section_count);
895 sbi->total_node_count =
896 (le32_to_cpu(raw_super->segment_count_nat) / 2)
897 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
898 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
899 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
900 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
901 sbi->cur_victim_sec = NULL_SECNO;
902 sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
903
904 for (i = 0; i < NR_COUNT_TYPE; i++)
905 atomic_set(&sbi->nr_pages[i], 0);
906
907 sbi->dir_level = DEF_DIR_LEVEL;
908 clear_sbi_flag(sbi, SBI_NEED_FSCK);
909 }
910
911 /*
912 * Read f2fs raw super block.
913 * Because we have two copies of super block, so read the first one at first,
914 * if the first one is invalid, move to read the second one.
915 */
916 static int read_raw_super_block(struct super_block *sb,
917 struct f2fs_super_block **raw_super,
918 struct buffer_head **raw_super_buf)
919 {
920 int block = 0;
921
922 retry:
923 *raw_super_buf = sb_bread(sb, block);
924 if (!*raw_super_buf) {
925 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
926 block + 1);
927 if (block == 0) {
928 block++;
929 goto retry;
930 } else {
931 return -EIO;
932 }
933 }
934
935 *raw_super = (struct f2fs_super_block *)
936 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
937
938 /* sanity checking of raw super */
939 if (sanity_check_raw_super(sb, *raw_super)) {
940 brelse(*raw_super_buf);
941 f2fs_msg(sb, KERN_ERR,
942 "Can't find valid F2FS filesystem in %dth superblock",
943 block + 1);
944 if (block == 0) {
945 block++;
946 goto retry;
947 } else {
948 return -EINVAL;
949 }
950 }
951
952 return 0;
953 }
954
955 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
956 {
957 struct f2fs_sb_info *sbi;
958 struct f2fs_super_block *raw_super = NULL;
959 struct buffer_head *raw_super_buf;
960 struct inode *root;
961 long err = -EINVAL;
962 bool retry = true;
963 char *options = NULL;
964 int i;
965
966 try_onemore:
967 /* allocate memory for f2fs-specific super block info */
968 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
969 if (!sbi)
970 return -ENOMEM;
971
972 /* set a block size */
973 if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
974 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
975 goto free_sbi;
976 }
977
978 err = read_raw_super_block(sb, &raw_super, &raw_super_buf);
979 if (err)
980 goto free_sbi;
981
982 sb->s_fs_info = sbi;
983 /* init some FS parameters */
984 sbi->active_logs = NR_CURSEG_TYPE;
985
986 set_opt(sbi, BG_GC);
987
988 #ifdef CONFIG_F2FS_FS_XATTR
989 set_opt(sbi, XATTR_USER);
990 #endif
991 #ifdef CONFIG_F2FS_FS_POSIX_ACL
992 set_opt(sbi, POSIX_ACL);
993 #endif
994 /* parse mount options */
995 options = kstrdup((const char *)data, GFP_KERNEL);
996 if (data && !options) {
997 err = -ENOMEM;
998 goto free_sb_buf;
999 }
1000
1001 err = parse_options(sb, options);
1002 if (err)
1003 goto free_options;
1004
1005 sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
1006 sb->s_max_links = F2FS_LINK_MAX;
1007 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1008
1009 sb->s_op = &f2fs_sops;
1010 sb->s_xattr = f2fs_xattr_handlers;
1011 sb->s_export_op = &f2fs_export_ops;
1012 sb->s_magic = F2FS_SUPER_MAGIC;
1013 sb->s_time_gran = 1;
1014 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1015 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
1016 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
1017
1018 /* init f2fs-specific super block info */
1019 sbi->sb = sb;
1020 sbi->raw_super = raw_super;
1021 sbi->raw_super_buf = raw_super_buf;
1022 mutex_init(&sbi->gc_mutex);
1023 mutex_init(&sbi->writepages);
1024 mutex_init(&sbi->cp_mutex);
1025 init_rwsem(&sbi->node_write);
1026 clear_sbi_flag(sbi, SBI_POR_DOING);
1027 spin_lock_init(&sbi->stat_lock);
1028
1029 init_rwsem(&sbi->read_io.io_rwsem);
1030 sbi->read_io.sbi = sbi;
1031 sbi->read_io.bio = NULL;
1032 for (i = 0; i < NR_PAGE_TYPE; i++) {
1033 init_rwsem(&sbi->write_io[i].io_rwsem);
1034 sbi->write_io[i].sbi = sbi;
1035 sbi->write_io[i].bio = NULL;
1036 }
1037
1038 init_rwsem(&sbi->cp_rwsem);
1039 init_waitqueue_head(&sbi->cp_wait);
1040 init_sb_info(sbi);
1041
1042 /* get an inode for meta space */
1043 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
1044 if (IS_ERR(sbi->meta_inode)) {
1045 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
1046 err = PTR_ERR(sbi->meta_inode);
1047 goto free_options;
1048 }
1049
1050 err = get_valid_checkpoint(sbi);
1051 if (err) {
1052 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
1053 goto free_meta_inode;
1054 }
1055
1056 /* sanity checking of checkpoint */
1057 err = -EINVAL;
1058 if (sanity_check_ckpt(sbi)) {
1059 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
1060 goto free_cp;
1061 }
1062
1063 sbi->total_valid_node_count =
1064 le32_to_cpu(sbi->ckpt->valid_node_count);
1065 sbi->total_valid_inode_count =
1066 le32_to_cpu(sbi->ckpt->valid_inode_count);
1067 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
1068 sbi->total_valid_block_count =
1069 le64_to_cpu(sbi->ckpt->valid_block_count);
1070 sbi->last_valid_block_count = sbi->total_valid_block_count;
1071 sbi->alloc_valid_block_count = 0;
1072 INIT_LIST_HEAD(&sbi->dir_inode_list);
1073 spin_lock_init(&sbi->dir_inode_lock);
1074
1075 init_ino_entry_info(sbi);
1076
1077 /* setup f2fs internal modules */
1078 err = build_segment_manager(sbi);
1079 if (err) {
1080 f2fs_msg(sb, KERN_ERR,
1081 "Failed to initialize F2FS segment manager");
1082 goto free_sm;
1083 }
1084 err = build_node_manager(sbi);
1085 if (err) {
1086 f2fs_msg(sb, KERN_ERR,
1087 "Failed to initialize F2FS node manager");
1088 goto free_nm;
1089 }
1090
1091 build_gc_manager(sbi);
1092
1093 /* get an inode for node space */
1094 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
1095 if (IS_ERR(sbi->node_inode)) {
1096 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
1097 err = PTR_ERR(sbi->node_inode);
1098 goto free_nm;
1099 }
1100
1101 /* if there are nt orphan nodes free them */
1102 recover_orphan_inodes(sbi);
1103
1104 /* read root inode and dentry */
1105 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
1106 if (IS_ERR(root)) {
1107 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
1108 err = PTR_ERR(root);
1109 goto free_node_inode;
1110 }
1111 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1112 iput(root);
1113 err = -EINVAL;
1114 goto free_node_inode;
1115 }
1116
1117 sb->s_root = d_make_root(root); /* allocate root dentry */
1118 if (!sb->s_root) {
1119 err = -ENOMEM;
1120 goto free_root_inode;
1121 }
1122
1123 err = f2fs_build_stats(sbi);
1124 if (err)
1125 goto free_root_inode;
1126
1127 if (f2fs_proc_root)
1128 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1129
1130 if (sbi->s_proc)
1131 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1132 &f2fs_seq_segment_info_fops, sb);
1133
1134 if (test_opt(sbi, DISCARD)) {
1135 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1136 if (!blk_queue_discard(q))
1137 f2fs_msg(sb, KERN_WARNING,
1138 "mounting with \"discard\" option, but "
1139 "the device does not support discard");
1140 }
1141
1142 sbi->s_kobj.kset = f2fs_kset;
1143 init_completion(&sbi->s_kobj_unregister);
1144 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1145 "%s", sb->s_id);
1146 if (err)
1147 goto free_proc;
1148
1149 if (!retry)
1150 set_sbi_flag(sbi, SBI_NEED_FSCK);
1151
1152 /* recover fsynced data */
1153 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1154 /*
1155 * mount should be failed, when device has readonly mode, and
1156 * previous checkpoint was not done by clean system shutdown.
1157 */
1158 if (bdev_read_only(sb->s_bdev) &&
1159 !is_set_ckpt_flags(sbi->ckpt, CP_UMOUNT_FLAG)) {
1160 err = -EROFS;
1161 goto free_kobj;
1162 }
1163 err = recover_fsync_data(sbi);
1164 if (err) {
1165 f2fs_msg(sb, KERN_ERR,
1166 "Cannot recover all fsync data errno=%ld", err);
1167 goto free_kobj;
1168 }
1169 }
1170
1171 /*
1172 * If filesystem is not mounted as read-only then
1173 * do start the gc_thread.
1174 */
1175 if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
1176 /* After POR, we can run background GC thread.*/
1177 err = start_gc_thread(sbi);
1178 if (err)
1179 goto free_kobj;
1180 }
1181 kfree(options);
1182 return 0;
1183
1184 free_kobj:
1185 kobject_del(&sbi->s_kobj);
1186 free_proc:
1187 if (sbi->s_proc) {
1188 remove_proc_entry("segment_info", sbi->s_proc);
1189 remove_proc_entry(sb->s_id, f2fs_proc_root);
1190 }
1191 f2fs_destroy_stats(sbi);
1192 free_root_inode:
1193 dput(sb->s_root);
1194 sb->s_root = NULL;
1195 free_node_inode:
1196 iput(sbi->node_inode);
1197 free_nm:
1198 destroy_node_manager(sbi);
1199 free_sm:
1200 destroy_segment_manager(sbi);
1201 free_cp:
1202 kfree(sbi->ckpt);
1203 free_meta_inode:
1204 make_bad_inode(sbi->meta_inode);
1205 iput(sbi->meta_inode);
1206 free_options:
1207 kfree(options);
1208 free_sb_buf:
1209 brelse(raw_super_buf);
1210 free_sbi:
1211 kfree(sbi);
1212
1213 /* give only one another chance */
1214 if (retry) {
1215 retry = 0;
1216 shrink_dcache_sb(sb);
1217 goto try_onemore;
1218 }
1219 return err;
1220 }
1221
1222 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1223 const char *dev_name, void *data)
1224 {
1225 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1226 }
1227
1228 static void kill_f2fs_super(struct super_block *sb)
1229 {
1230 if (sb->s_root)
1231 set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE);
1232 kill_block_super(sb);
1233 }
1234
1235 static struct file_system_type f2fs_fs_type = {
1236 .owner = THIS_MODULE,
1237 .name = "f2fs",
1238 .mount = f2fs_mount,
1239 .kill_sb = kill_f2fs_super,
1240 .fs_flags = FS_REQUIRES_DEV,
1241 };
1242 MODULE_ALIAS_FS("f2fs");
1243
1244 static int __init init_inodecache(void)
1245 {
1246 f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
1247 sizeof(struct f2fs_inode_info));
1248 if (!f2fs_inode_cachep)
1249 return -ENOMEM;
1250 return 0;
1251 }
1252
1253 static void destroy_inodecache(void)
1254 {
1255 /*
1256 * Make sure all delayed rcu free inodes are flushed before we
1257 * destroy cache.
1258 */
1259 rcu_barrier();
1260 kmem_cache_destroy(f2fs_inode_cachep);
1261 }
1262
1263 static int __init init_f2fs_fs(void)
1264 {
1265 int err;
1266
1267 f2fs_build_trace_ios();
1268
1269 err = init_inodecache();
1270 if (err)
1271 goto fail;
1272 err = create_node_manager_caches();
1273 if (err)
1274 goto free_inodecache;
1275 err = create_segment_manager_caches();
1276 if (err)
1277 goto free_node_manager_caches;
1278 err = create_checkpoint_caches();
1279 if (err)
1280 goto free_segment_manager_caches;
1281 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1282 if (!f2fs_kset) {
1283 err = -ENOMEM;
1284 goto free_checkpoint_caches;
1285 }
1286 err = register_filesystem(&f2fs_fs_type);
1287 if (err)
1288 goto free_kset;
1289 f2fs_create_root_stats();
1290 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1291 return 0;
1292
1293 free_kset:
1294 kset_unregister(f2fs_kset);
1295 free_checkpoint_caches:
1296 destroy_checkpoint_caches();
1297 free_segment_manager_caches:
1298 destroy_segment_manager_caches();
1299 free_node_manager_caches:
1300 destroy_node_manager_caches();
1301 free_inodecache:
1302 destroy_inodecache();
1303 fail:
1304 return err;
1305 }
1306
1307 static void __exit exit_f2fs_fs(void)
1308 {
1309 remove_proc_entry("fs/f2fs", NULL);
1310 f2fs_destroy_root_stats();
1311 unregister_filesystem(&f2fs_fs_type);
1312 destroy_checkpoint_caches();
1313 destroy_segment_manager_caches();
1314 destroy_node_manager_caches();
1315 destroy_inodecache();
1316 kset_unregister(f2fs_kset);
1317 f2fs_destroy_trace_ios();
1318 }
1319
1320 module_init(init_f2fs_fs)
1321 module_exit(exit_f2fs_fs)
1322
1323 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1324 MODULE_DESCRIPTION("Flash Friendly File System");
1325 MODULE_LICENSE("GPL");
Linux with added FPC-III support