projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
f2fs: trigger release_dirty_inode in f2fs_put_super
[deliverable/linux.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
34 #define CREATE_TRACE_POINTS
35 #include <trace/events/f2fs.h>
36
37 static struct proc_dir_entry *f2fs_proc_root;
38 static struct kmem_cache *f2fs_inode_cachep;
39 static struct kset *f2fs_kset;
40
41 enum {
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,
53 Opt_inline_data,
54 Opt_flush_merge,
55 Opt_nobarrier,
56 Opt_err,
57 };
58
59 static match_table_t f2fs_tokens = {
60 {Opt_gc_background, "background_gc=%s"},
61 {Opt_disable_roll_forward, "disable_roll_forward"},
62 {Opt_discard, "discard"},
63 {Opt_noheap, "no_heap"},
64 {Opt_user_xattr, "user_xattr"},
65 {Opt_nouser_xattr, "nouser_xattr"},
66 {Opt_acl, "acl"},
67 {Opt_noacl, "noacl"},
68 {Opt_active_logs, "active_logs=%u"},
69 {Opt_disable_ext_identify, "disable_ext_identify"},
70 {Opt_inline_xattr, "inline_xattr"},
71 {Opt_inline_data, "inline_data"},
72 {Opt_flush_merge, "flush_merge"},
73 {Opt_nobarrier, "nobarrier"},
74 {Opt_err, NULL},
75 };
76
77 /* Sysfs support for f2fs */
78 enum {
79 GC_THREAD, /* struct f2fs_gc_thread */
80 SM_INFO, /* struct f2fs_sm_info */
81 NM_INFO, /* struct f2fs_nm_info */
82 F2FS_SBI, /* struct f2fs_sb_info */
83 };
84
85 struct f2fs_attr {
86 struct attribute attr;
87 ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
88 ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
89 const char *, size_t);
90 int struct_type;
91 int offset;
92 };
93
94 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
95 {
96 if (struct_type == GC_THREAD)
97 return (unsigned char *)sbi->gc_thread;
98 else if (struct_type == SM_INFO)
99 return (unsigned char *)SM_I(sbi);
100 else if (struct_type == NM_INFO)
101 return (unsigned char *)NM_I(sbi);
102 else if (struct_type == F2FS_SBI)
103 return (unsigned char *)sbi;
104 return NULL;
105 }
106
107 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
108 struct f2fs_sb_info *sbi, char *buf)
109 {
110 unsigned char *ptr = NULL;
111 unsigned int *ui;
112
113 ptr = __struct_ptr(sbi, a->struct_type);
114 if (!ptr)
115 return -EINVAL;
116
117 ui = (unsigned int *)(ptr + a->offset);
118
119 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
120 }
121
122 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
123 struct f2fs_sb_info *sbi,
124 const char *buf, size_t count)
125 {
126 unsigned char *ptr;
127 unsigned long t;
128 unsigned int *ui;
129 ssize_t ret;
130
131 ptr = __struct_ptr(sbi, a->struct_type);
132 if (!ptr)
133 return -EINVAL;
134
135 ui = (unsigned int *)(ptr + a->offset);
136
137 ret = kstrtoul(skip_spaces(buf), 0, &t);
138 if (ret < 0)
139 return ret;
140 *ui = t;
141 return count;
142 }
143
144 static ssize_t f2fs_attr_show(struct kobject *kobj,
145 struct attribute *attr, char *buf)
146 {
147 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
148 s_kobj);
149 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
150
151 return a->show ? a->show(a, sbi, buf) : 0;
152 }
153
154 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
155 const char *buf, size_t len)
156 {
157 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
158 s_kobj);
159 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
160
161 return a->store ? a->store(a, sbi, buf, len) : 0;
162 }
163
164 static void f2fs_sb_release(struct kobject *kobj)
165 {
166 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
167 s_kobj);
168 complete(&sbi->s_kobj_unregister);
169 }
170
171 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
172 static struct f2fs_attr f2fs_attr_##_name = { \
173 .attr = {.name = __stringify(_name), .mode = _mode }, \
174 .show = _show, \
175 .store = _store, \
176 .struct_type = _struct_type, \
177 .offset = _offset \
178 }
179
180 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \
181 F2FS_ATTR_OFFSET(struct_type, name, 0644, \
182 f2fs_sbi_show, f2fs_sbi_store, \
183 offsetof(struct struct_name, elname))
184
185 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
186 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
187 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
188 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
189 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
190 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
191 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
192 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
193 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
194 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
195 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
196
197 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
198 static struct attribute *f2fs_attrs[] = {
199 ATTR_LIST(gc_min_sleep_time),
200 ATTR_LIST(gc_max_sleep_time),
201 ATTR_LIST(gc_no_gc_sleep_time),
202 ATTR_LIST(gc_idle),
203 ATTR_LIST(reclaim_segments),
204 ATTR_LIST(max_small_discards),
205 ATTR_LIST(ipu_policy),
206 ATTR_LIST(min_ipu_util),
207 ATTR_LIST(max_victim_search),
208 ATTR_LIST(dir_level),
209 ATTR_LIST(ram_thresh),
210 NULL,
211 };
212
213 static const struct sysfs_ops f2fs_attr_ops = {
214 .show = f2fs_attr_show,
215 .store = f2fs_attr_store,
216 };
217
218 static struct kobj_type f2fs_ktype = {
219 .default_attrs = f2fs_attrs,
220 .sysfs_ops = &f2fs_attr_ops,
221 .release = f2fs_sb_release,
222 };
223
224 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
225 {
226 struct va_format vaf;
227 va_list args;
228
229 va_start(args, fmt);
230 vaf.fmt = fmt;
231 vaf.va = &args;
232 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
233 va_end(args);
234 }
235
236 static void init_once(void *foo)
237 {
238 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
239
240 inode_init_once(&fi->vfs_inode);
241 }
242
243 static int parse_options(struct super_block *sb, char *options)
244 {
245 struct f2fs_sb_info *sbi = F2FS_SB(sb);
246 substring_t args[MAX_OPT_ARGS];
247 char *p, *name;
248 int arg = 0;
249
250 if (!options)
251 return 0;
252
253 while ((p = strsep(&options, ",")) != NULL) {
254 int token;
255 if (!*p)
256 continue;
257 /*
258 * Initialize args struct so we know whether arg was
259 * found; some options take optional arguments.
260 */
261 args[0].to = args[0].from = NULL;
262 token = match_token(p, f2fs_tokens, args);
263
264 switch (token) {
265 case Opt_gc_background:
266 name = match_strdup(&args[0]);
267
268 if (!name)
269 return -ENOMEM;
270 if (strlen(name) == 2 && !strncmp(name, "on", 2))
271 set_opt(sbi, BG_GC);
272 else if (strlen(name) == 3 && !strncmp(name, "off", 3))
273 clear_opt(sbi, BG_GC);
274 else {
275 kfree(name);
276 return -EINVAL;
277 }
278 kfree(name);
279 break;
280 case Opt_disable_roll_forward:
281 set_opt(sbi, DISABLE_ROLL_FORWARD);
282 break;
283 case Opt_discard:
284 set_opt(sbi, DISCARD);
285 break;
286 case Opt_noheap:
287 set_opt(sbi, NOHEAP);
288 break;
289 #ifdef CONFIG_F2FS_FS_XATTR
290 case Opt_user_xattr:
291 set_opt(sbi, XATTR_USER);
292 break;
293 case Opt_nouser_xattr:
294 clear_opt(sbi, XATTR_USER);
295 break;
296 case Opt_inline_xattr:
297 set_opt(sbi, INLINE_XATTR);
298 break;
299 #else
300 case Opt_user_xattr:
301 f2fs_msg(sb, KERN_INFO,
302 "user_xattr options not supported");
303 break;
304 case Opt_nouser_xattr:
305 f2fs_msg(sb, KERN_INFO,
306 "nouser_xattr options not supported");
307 break;
308 case Opt_inline_xattr:
309 f2fs_msg(sb, KERN_INFO,
310 "inline_xattr options not supported");
311 break;
312 #endif
313 #ifdef CONFIG_F2FS_FS_POSIX_ACL
314 case Opt_acl:
315 set_opt(sbi, POSIX_ACL);
316 break;
317 case Opt_noacl:
318 clear_opt(sbi, POSIX_ACL);
319 break;
320 #else
321 case Opt_acl:
322 f2fs_msg(sb, KERN_INFO, "acl options not supported");
323 break;
324 case Opt_noacl:
325 f2fs_msg(sb, KERN_INFO, "noacl options not supported");
326 break;
327 #endif
328 case Opt_active_logs:
329 if (args->from && match_int(args, &arg))
330 return -EINVAL;
331 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
332 return -EINVAL;
333 sbi->active_logs = arg;
334 break;
335 case Opt_disable_ext_identify:
336 set_opt(sbi, DISABLE_EXT_IDENTIFY);
337 break;
338 case Opt_inline_data:
339 set_opt(sbi, INLINE_DATA);
340 break;
341 case Opt_flush_merge:
342 set_opt(sbi, FLUSH_MERGE);
343 break;
344 case Opt_nobarrier:
345 set_opt(sbi, NOBARRIER);
346 break;
347 default:
348 f2fs_msg(sb, KERN_ERR,
349 "Unrecognized mount option \"%s\" or missing value",
350 p);
351 return -EINVAL;
352 }
353 }
354 return 0;
355 }
356
357 static struct inode *f2fs_alloc_inode(struct super_block *sb)
358 {
359 struct f2fs_inode_info *fi;
360
361 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
362 if (!fi)
363 return NULL;
364
365 init_once((void *) fi);
366
367 /* Initialize f2fs-specific inode info */
368 fi->vfs_inode.i_version = 1;
369 atomic_set(&fi->dirty_dents, 0);
370 fi->i_current_depth = 1;
371 fi->i_advise = 0;
372 rwlock_init(&fi->ext.ext_lock);
373 init_rwsem(&fi->i_sem);
374
375 set_inode_flag(fi, FI_NEW_INODE);
376
377 if (test_opt(F2FS_SB(sb), INLINE_XATTR))
378 set_inode_flag(fi, FI_INLINE_XATTR);
379
380 /* Will be used by directory only */
381 fi->i_dir_level = F2FS_SB(sb)->dir_level;
382
383 return &fi->vfs_inode;
384 }
385
386 static int f2fs_drop_inode(struct inode *inode)
387 {
388 /*
389 * This is to avoid a deadlock condition like below.
390 * writeback_single_inode(inode)
391 * - f2fs_write_data_page
392 * - f2fs_gc -> iput -> evict
393 * - inode_wait_for_writeback(inode)
394 */
395 if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
396 return 0;
397 return generic_drop_inode(inode);
398 }
399
400 /*
401 * f2fs_dirty_inode() is called from __mark_inode_dirty()
402 *
403 * We should call set_dirty_inode to write the dirty inode through write_inode.
404 */
405 static void f2fs_dirty_inode(struct inode *inode, int flags)
406 {
407 set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
408 }
409
410 static void f2fs_i_callback(struct rcu_head *head)
411 {
412 struct inode *inode = container_of(head, struct inode, i_rcu);
413 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
414 }
415
416 static void f2fs_destroy_inode(struct inode *inode)
417 {
418 call_rcu(&inode->i_rcu, f2fs_i_callback);
419 }
420
421 static void f2fs_put_super(struct super_block *sb)
422 {
423 struct f2fs_sb_info *sbi = F2FS_SB(sb);
424
425 if (sbi->s_proc) {
426 remove_proc_entry("segment_info", sbi->s_proc);
427 remove_proc_entry(sb->s_id, f2fs_proc_root);
428 }
429 kobject_del(&sbi->s_kobj);
430
431 f2fs_destroy_stats(sbi);
432 stop_gc_thread(sbi);
433
434 /* We don't need to do checkpoint when it's clean */
435 if (sbi->s_dirty)
436 write_checkpoint(sbi, true);
437
438 /* normally superblock is clean, so we need to release this */
439 release_dirty_inode(sbi);
440
441 iput(sbi->node_inode);
442 iput(sbi->meta_inode);
443
444 /* destroy f2fs internal modules */
445 destroy_node_manager(sbi);
446 destroy_segment_manager(sbi);
447
448 kfree(sbi->ckpt);
449 kobject_put(&sbi->s_kobj);
450 wait_for_completion(&sbi->s_kobj_unregister);
451
452 sb->s_fs_info = NULL;
453 brelse(sbi->raw_super_buf);
454 kfree(sbi);
455 }
456
457 int f2fs_sync_fs(struct super_block *sb, int sync)
458 {
459 struct f2fs_sb_info *sbi = F2FS_SB(sb);
460
461 trace_f2fs_sync_fs(sb, sync);
462
463 if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
464 return 0;
465
466 if (sync) {
467 mutex_lock(&sbi->gc_mutex);
468 write_checkpoint(sbi, false);
469 mutex_unlock(&sbi->gc_mutex);
470 } else {
471 f2fs_balance_fs(sbi);
472 }
473
474 return 0;
475 }
476
477 static int f2fs_freeze(struct super_block *sb)
478 {
479 int err;
480
481 if (f2fs_readonly(sb))
482 return 0;
483
484 err = f2fs_sync_fs(sb, 1);
485 return err;
486 }
487
488 static int f2fs_unfreeze(struct super_block *sb)
489 {
490 return 0;
491 }
492
493 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
494 {
495 struct super_block *sb = dentry->d_sb;
496 struct f2fs_sb_info *sbi = F2FS_SB(sb);
497 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
498 block_t total_count, user_block_count, start_count, ovp_count;
499
500 total_count = le64_to_cpu(sbi->raw_super->block_count);
501 user_block_count = sbi->user_block_count;
502 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
503 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
504 buf->f_type = F2FS_SUPER_MAGIC;
505 buf->f_bsize = sbi->blocksize;
506
507 buf->f_blocks = total_count - start_count;
508 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
509 buf->f_bavail = user_block_count - valid_user_blocks(sbi);
510
511 buf->f_files = sbi->total_node_count;
512 buf->f_ffree = sbi->total_node_count - valid_inode_count(sbi);
513
514 buf->f_namelen = F2FS_NAME_LEN;
515 buf->f_fsid.val[0] = (u32)id;
516 buf->f_fsid.val[1] = (u32)(id >> 32);
517
518 return 0;
519 }
520
521 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
522 {
523 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
524
525 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC))
526 seq_printf(seq, ",background_gc=%s", "on");
527 else
528 seq_printf(seq, ",background_gc=%s", "off");
529 if (test_opt(sbi, DISABLE_ROLL_FORWARD))
530 seq_puts(seq, ",disable_roll_forward");
531 if (test_opt(sbi, DISCARD))
532 seq_puts(seq, ",discard");
533 if (test_opt(sbi, NOHEAP))
534 seq_puts(seq, ",no_heap_alloc");
535 #ifdef CONFIG_F2FS_FS_XATTR
536 if (test_opt(sbi, XATTR_USER))
537 seq_puts(seq, ",user_xattr");
538 else
539 seq_puts(seq, ",nouser_xattr");
540 if (test_opt(sbi, INLINE_XATTR))
541 seq_puts(seq, ",inline_xattr");
542 #endif
543 #ifdef CONFIG_F2FS_FS_POSIX_ACL
544 if (test_opt(sbi, POSIX_ACL))
545 seq_puts(seq, ",acl");
546 else
547 seq_puts(seq, ",noacl");
548 #endif
549 if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
550 seq_puts(seq, ",disable_ext_identify");
551 if (test_opt(sbi, INLINE_DATA))
552 seq_puts(seq, ",inline_data");
553 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
554 seq_puts(seq, ",flush_merge");
555 if (test_opt(sbi, NOBARRIER))
556 seq_puts(seq, ",nobarrier");
557 seq_printf(seq, ",active_logs=%u", sbi->active_logs);
558
559 return 0;
560 }
561
562 static int segment_info_seq_show(struct seq_file *seq, void *offset)
563 {
564 struct super_block *sb = seq->private;
565 struct f2fs_sb_info *sbi = F2FS_SB(sb);
566 unsigned int total_segs =
567 le32_to_cpu(sbi->raw_super->segment_count_main);
568 int i;
569
570 seq_puts(seq, "format: segment_type|valid_blocks\n"
571 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
572
573 for (i = 0; i < total_segs; i++) {
574 struct seg_entry *se = get_seg_entry(sbi, i);
575
576 if ((i % 10) == 0)
577 seq_printf(seq, "%-5d", i);
578 seq_printf(seq, "%d|%-3u", se->type,
579 get_valid_blocks(sbi, i, 1));
580 if ((i % 10) == 9 || i == (total_segs - 1))
581 seq_putc(seq, '\n');
582 else
583 seq_putc(seq, ' ');
584 }
585
586 return 0;
587 }
588
589 static int segment_info_open_fs(struct inode *inode, struct file *file)
590 {
591 return single_open(file, segment_info_seq_show, PDE_DATA(inode));
592 }
593
594 static const struct file_operations f2fs_seq_segment_info_fops = {
595 .owner = THIS_MODULE,
596 .open = segment_info_open_fs,
597 .read = seq_read,
598 .llseek = seq_lseek,
599 .release = single_release,
600 };
601
602 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
603 {
604 struct f2fs_sb_info *sbi = F2FS_SB(sb);
605 struct f2fs_mount_info org_mount_opt;
606 int err, active_logs;
607 bool need_restart_gc = false;
608 bool need_stop_gc = false;
609
610 sync_filesystem(sb);
611
612 /*
613 * Save the old mount options in case we
614 * need to restore them.
615 */
616 org_mount_opt = sbi->mount_opt;
617 active_logs = sbi->active_logs;
618
619 /* parse mount options */
620 err = parse_options(sb, data);
621 if (err)
622 goto restore_opts;
623
624 /*
625 * Previous and new state of filesystem is RO,
626 * so skip checking GC and FLUSH_MERGE conditions.
627 */
628 if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
629 goto skip;
630
631 /*
632 * We stop the GC thread if FS is mounted as RO
633 * or if background_gc = off is passed in mount
634 * option. Also sync the filesystem.
635 */
636 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
637 if (sbi->gc_thread) {
638 stop_gc_thread(sbi);
639 f2fs_sync_fs(sb, 1);
640 need_restart_gc = true;
641 }
642 } else if (test_opt(sbi, BG_GC) && !sbi->gc_thread) {
643 err = start_gc_thread(sbi);
644 if (err)
645 goto restore_opts;
646 need_stop_gc = true;
647 }
648
649 /*
650 * We stop issue flush thread if FS is mounted as RO
651 * or if flush_merge is not passed in mount option.
652 */
653 if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
654 destroy_flush_cmd_control(sbi);
655 } else if (test_opt(sbi, FLUSH_MERGE) && !SM_I(sbi)->cmd_control_info) {
656 err = create_flush_cmd_control(sbi);
657 if (err)
658 goto restore_gc;
659 }
660 skip:
661 /* Update the POSIXACL Flag */
662 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
663 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
664 return 0;
665 restore_gc:
666 if (need_restart_gc) {
667 if (start_gc_thread(sbi))
668 f2fs_msg(sbi->sb, KERN_WARNING,
669 "background gc thread has stopped");
670 } else if (need_stop_gc) {
671 stop_gc_thread(sbi);
672 }
673 restore_opts:
674 sbi->mount_opt = org_mount_opt;
675 sbi->active_logs = active_logs;
676 return err;
677 }
678
679 static struct super_operations f2fs_sops = {
680 .alloc_inode = f2fs_alloc_inode,
681 .drop_inode = f2fs_drop_inode,
682 .destroy_inode = f2fs_destroy_inode,
683 .write_inode = f2fs_write_inode,
684 .dirty_inode = f2fs_dirty_inode,
685 .show_options = f2fs_show_options,
686 .evict_inode = f2fs_evict_inode,
687 .put_super = f2fs_put_super,
688 .sync_fs = f2fs_sync_fs,
689 .freeze_fs = f2fs_freeze,
690 .unfreeze_fs = f2fs_unfreeze,
691 .statfs = f2fs_statfs,
692 .remount_fs = f2fs_remount,
693 };
694
695 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
696 u64 ino, u32 generation)
697 {
698 struct f2fs_sb_info *sbi = F2FS_SB(sb);
699 struct inode *inode;
700
701 if (check_nid_range(sbi, ino))
702 return ERR_PTR(-ESTALE);
703
704 /*
705 * f2fs_iget isn't quite right if the inode is currently unallocated!
706 * However f2fs_iget currently does appropriate checks to handle stale
707 * inodes so everything is OK.
708 */
709 inode = f2fs_iget(sb, ino);
710 if (IS_ERR(inode))
711 return ERR_CAST(inode);
712 if (unlikely(generation && inode->i_generation != generation)) {
713 /* we didn't find the right inode.. */
714 iput(inode);
715 return ERR_PTR(-ESTALE);
716 }
717 return inode;
718 }
719
720 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
721 int fh_len, int fh_type)
722 {
723 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
724 f2fs_nfs_get_inode);
725 }
726
727 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
728 int fh_len, int fh_type)
729 {
730 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
731 f2fs_nfs_get_inode);
732 }
733
734 static const struct export_operations f2fs_export_ops = {
735 .fh_to_dentry = f2fs_fh_to_dentry,
736 .fh_to_parent = f2fs_fh_to_parent,
737 .get_parent = f2fs_get_parent,
738 };
739
740 static loff_t max_file_size(unsigned bits)
741 {
742 loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
743 loff_t leaf_count = ADDRS_PER_BLOCK;
744
745 /* two direct node blocks */
746 result += (leaf_count * 2);
747
748 /* two indirect node blocks */
749 leaf_count *= NIDS_PER_BLOCK;
750 result += (leaf_count * 2);
751
752 /* one double indirect node block */
753 leaf_count *= NIDS_PER_BLOCK;
754 result += leaf_count;
755
756 result <<= bits;
757 return result;
758 }
759
760 static int sanity_check_raw_super(struct super_block *sb,
761 struct f2fs_super_block *raw_super)
762 {
763 unsigned int blocksize;
764
765 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
766 f2fs_msg(sb, KERN_INFO,
767 "Magic Mismatch, valid(0x%x) - read(0x%x)",
768 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
769 return 1;
770 }
771
772 /* Currently, support only 4KB page cache size */
773 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
774 f2fs_msg(sb, KERN_INFO,
775 "Invalid page_cache_size (%lu), supports only 4KB\n",
776 PAGE_CACHE_SIZE);
777 return 1;
778 }
779
780 /* Currently, support only 4KB block size */
781 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
782 if (blocksize != F2FS_BLKSIZE) {
783 f2fs_msg(sb, KERN_INFO,
784 "Invalid blocksize (%u), supports only 4KB\n",
785 blocksize);
786 return 1;
787 }
788
789 if (le32_to_cpu(raw_super->log_sectorsize) !=
790 F2FS_LOG_SECTOR_SIZE) {
791 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize");
792 return 1;
793 }
794 if (le32_to_cpu(raw_super->log_sectors_per_block) !=
795 F2FS_LOG_SECTORS_PER_BLOCK) {
796 f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block");
797 return 1;
798 }
799 return 0;
800 }
801
802 static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
803 {
804 unsigned int total, fsmeta;
805 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
806 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
807
808 total = le32_to_cpu(raw_super->segment_count);
809 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
810 fsmeta += le32_to_cpu(raw_super->segment_count_sit);
811 fsmeta += le32_to_cpu(raw_super->segment_count_nat);
812 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
813 fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
814
815 if (unlikely(fsmeta >= total))
816 return 1;
817
818 if (unlikely(is_set_ckpt_flags(ckpt, CP_ERROR_FLAG))) {
819 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
820 return 1;
821 }
822 return 0;
823 }
824
825 static void init_sb_info(struct f2fs_sb_info *sbi)
826 {
827 struct f2fs_super_block *raw_super = sbi->raw_super;
828 int i;
829
830 sbi->log_sectors_per_block =
831 le32_to_cpu(raw_super->log_sectors_per_block);
832 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
833 sbi->blocksize = 1 << sbi->log_blocksize;
834 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
835 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
836 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
837 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
838 sbi->total_sections = le32_to_cpu(raw_super->section_count);
839 sbi->total_node_count =
840 (le32_to_cpu(raw_super->segment_count_nat) / 2)
841 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
842 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
843 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
844 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
845 sbi->cur_victim_sec = NULL_SECNO;
846 sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
847
848 for (i = 0; i < NR_COUNT_TYPE; i++)
849 atomic_set(&sbi->nr_pages[i], 0);
850
851 sbi->dir_level = DEF_DIR_LEVEL;
852 }
853
854 /*
855 * Read f2fs raw super block.
856 * Because we have two copies of super block, so read the first one at first,
857 * if the first one is invalid, move to read the second one.
858 */
859 static int read_raw_super_block(struct super_block *sb,
860 struct f2fs_super_block **raw_super,
861 struct buffer_head **raw_super_buf)
862 {
863 int block = 0;
864
865 retry:
866 *raw_super_buf = sb_bread(sb, block);
867 if (!*raw_super_buf) {
868 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
869 block + 1);
870 if (block == 0) {
871 block++;
872 goto retry;
873 } else {
874 return -EIO;
875 }
876 }
877
878 *raw_super = (struct f2fs_super_block *)
879 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
880
881 /* sanity checking of raw super */
882 if (sanity_check_raw_super(sb, *raw_super)) {
883 brelse(*raw_super_buf);
884 f2fs_msg(sb, KERN_ERR,
885 "Can't find valid F2FS filesystem in %dth superblock",
886 block + 1);
887 if (block == 0) {
888 block++;
889 goto retry;
890 } else {
891 return -EINVAL;
892 }
893 }
894
895 return 0;
896 }
897
898 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
899 {
900 struct f2fs_sb_info *sbi;
901 struct f2fs_super_block *raw_super;
902 struct buffer_head *raw_super_buf;
903 struct inode *root;
904 long err = -EINVAL;
905 int i;
906
907 /* allocate memory for f2fs-specific super block info */
908 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
909 if (!sbi)
910 return -ENOMEM;
911
912 /* set a block size */
913 if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
914 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
915 goto free_sbi;
916 }
917
918 err = read_raw_super_block(sb, &raw_super, &raw_super_buf);
919 if (err)
920 goto free_sbi;
921
922 sb->s_fs_info = sbi;
923 /* init some FS parameters */
924 sbi->active_logs = NR_CURSEG_TYPE;
925
926 set_opt(sbi, BG_GC);
927
928 #ifdef CONFIG_F2FS_FS_XATTR
929 set_opt(sbi, XATTR_USER);
930 #endif
931 #ifdef CONFIG_F2FS_FS_POSIX_ACL
932 set_opt(sbi, POSIX_ACL);
933 #endif
934 /* parse mount options */
935 err = parse_options(sb, (char *)data);
936 if (err)
937 goto free_sb_buf;
938
939 sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
940 sb->s_max_links = F2FS_LINK_MAX;
941 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
942
943 sb->s_op = &f2fs_sops;
944 sb->s_xattr = f2fs_xattr_handlers;
945 sb->s_export_op = &f2fs_export_ops;
946 sb->s_magic = F2FS_SUPER_MAGIC;
947 sb->s_time_gran = 1;
948 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
949 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
950 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
951
952 /* init f2fs-specific super block info */
953 sbi->sb = sb;
954 sbi->raw_super = raw_super;
955 sbi->raw_super_buf = raw_super_buf;
956 mutex_init(&sbi->gc_mutex);
957 mutex_init(&sbi->writepages);
958 mutex_init(&sbi->cp_mutex);
959 init_rwsem(&sbi->node_write);
960 sbi->por_doing = false;
961 spin_lock_init(&sbi->stat_lock);
962
963 init_rwsem(&sbi->read_io.io_rwsem);
964 sbi->read_io.sbi = sbi;
965 sbi->read_io.bio = NULL;
966 for (i = 0; i < NR_PAGE_TYPE; i++) {
967 init_rwsem(&sbi->write_io[i].io_rwsem);
968 sbi->write_io[i].sbi = sbi;
969 sbi->write_io[i].bio = NULL;
970 }
971
972 init_rwsem(&sbi->cp_rwsem);
973 init_waitqueue_head(&sbi->cp_wait);
974 init_sb_info(sbi);
975
976 /* get an inode for meta space */
977 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
978 if (IS_ERR(sbi->meta_inode)) {
979 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
980 err = PTR_ERR(sbi->meta_inode);
981 goto free_sb_buf;
982 }
983
984 err = get_valid_checkpoint(sbi);
985 if (err) {
986 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
987 goto free_meta_inode;
988 }
989
990 /* sanity checking of checkpoint */
991 err = -EINVAL;
992 if (sanity_check_ckpt(sbi)) {
993 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
994 goto free_cp;
995 }
996
997 sbi->total_valid_node_count =
998 le32_to_cpu(sbi->ckpt->valid_node_count);
999 sbi->total_valid_inode_count =
1000 le32_to_cpu(sbi->ckpt->valid_inode_count);
1001 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
1002 sbi->total_valid_block_count =
1003 le64_to_cpu(sbi->ckpt->valid_block_count);
1004 sbi->last_valid_block_count = sbi->total_valid_block_count;
1005 sbi->alloc_valid_block_count = 0;
1006 INIT_LIST_HEAD(&sbi->dir_inode_list);
1007 spin_lock_init(&sbi->dir_inode_lock);
1008
1009 init_ino_entry_info(sbi);
1010
1011 /* setup f2fs internal modules */
1012 err = build_segment_manager(sbi);
1013 if (err) {
1014 f2fs_msg(sb, KERN_ERR,
1015 "Failed to initialize F2FS segment manager");
1016 goto free_sm;
1017 }
1018 err = build_node_manager(sbi);
1019 if (err) {
1020 f2fs_msg(sb, KERN_ERR,
1021 "Failed to initialize F2FS node manager");
1022 goto free_nm;
1023 }
1024
1025 build_gc_manager(sbi);
1026
1027 /* get an inode for node space */
1028 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
1029 if (IS_ERR(sbi->node_inode)) {
1030 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
1031 err = PTR_ERR(sbi->node_inode);
1032 goto free_nm;
1033 }
1034
1035 /* if there are nt orphan nodes free them */
1036 recover_orphan_inodes(sbi);
1037
1038 /* read root inode and dentry */
1039 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
1040 if (IS_ERR(root)) {
1041 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
1042 err = PTR_ERR(root);
1043 goto free_node_inode;
1044 }
1045 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1046 iput(root);
1047 err = -EINVAL;
1048 goto free_node_inode;
1049 }
1050
1051 sb->s_root = d_make_root(root); /* allocate root dentry */
1052 if (!sb->s_root) {
1053 err = -ENOMEM;
1054 goto free_root_inode;
1055 }
1056
1057 err = f2fs_build_stats(sbi);
1058 if (err)
1059 goto free_root_inode;
1060
1061 if (f2fs_proc_root)
1062 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1063
1064 if (sbi->s_proc)
1065 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1066 &f2fs_seq_segment_info_fops, sb);
1067
1068 if (test_opt(sbi, DISCARD)) {
1069 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1070 if (!blk_queue_discard(q))
1071 f2fs_msg(sb, KERN_WARNING,
1072 "mounting with \"discard\" option, but "
1073 "the device does not support discard");
1074 }
1075
1076 sbi->s_kobj.kset = f2fs_kset;
1077 init_completion(&sbi->s_kobj_unregister);
1078 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1079 "%s", sb->s_id);
1080 if (err)
1081 goto free_proc;
1082
1083 /* recover fsynced data */
1084 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1085 err = recover_fsync_data(sbi);
1086 if (err)
1087 f2fs_msg(sb, KERN_ERR,
1088 "Cannot recover all fsync data errno=%ld", err);
1089 }
1090
1091 /*
1092 * If filesystem is not mounted as read-only then
1093 * do start the gc_thread.
1094 */
1095 if (!f2fs_readonly(sb)) {
1096 /* After POR, we can run background GC thread.*/
1097 err = start_gc_thread(sbi);
1098 if (err)
1099 goto free_kobj;
1100 }
1101 return 0;
1102
1103 free_kobj:
1104 kobject_del(&sbi->s_kobj);
1105 free_proc:
1106 if (sbi->s_proc) {
1107 remove_proc_entry("segment_info", sbi->s_proc);
1108 remove_proc_entry(sb->s_id, f2fs_proc_root);
1109 }
1110 f2fs_destroy_stats(sbi);
1111 free_root_inode:
1112 dput(sb->s_root);
1113 sb->s_root = NULL;
1114 free_node_inode:
1115 iput(sbi->node_inode);
1116 free_nm:
1117 destroy_node_manager(sbi);
1118 free_sm:
1119 destroy_segment_manager(sbi);
1120 free_cp:
1121 kfree(sbi->ckpt);
1122 free_meta_inode:
1123 make_bad_inode(sbi->meta_inode);
1124 iput(sbi->meta_inode);
1125 free_sb_buf:
1126 brelse(raw_super_buf);
1127 free_sbi:
1128 kfree(sbi);
1129 return err;
1130 }
1131
1132 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1133 const char *dev_name, void *data)
1134 {
1135 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1136 }
1137
1138 static struct file_system_type f2fs_fs_type = {
1139 .owner = THIS_MODULE,
1140 .name = "f2fs",
1141 .mount = f2fs_mount,
1142 .kill_sb = kill_block_super,
1143 .fs_flags = FS_REQUIRES_DEV,
1144 };
1145 MODULE_ALIAS_FS("f2fs");
1146
1147 static int __init init_inodecache(void)
1148 {
1149 f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
1150 sizeof(struct f2fs_inode_info));
1151 if (!f2fs_inode_cachep)
1152 return -ENOMEM;
1153 return 0;
1154 }
1155
1156 static void destroy_inodecache(void)
1157 {
1158 /*
1159 * Make sure all delayed rcu free inodes are flushed before we
1160 * destroy cache.
1161 */
1162 rcu_barrier();
1163 kmem_cache_destroy(f2fs_inode_cachep);
1164 }
1165
1166 static int __init init_f2fs_fs(void)
1167 {
1168 int err;
1169
1170 err = init_inodecache();
1171 if (err)
1172 goto fail;
1173 err = create_node_manager_caches();
1174 if (err)
1175 goto free_inodecache;
1176 err = create_segment_manager_caches();
1177 if (err)
1178 goto free_node_manager_caches;
1179 err = create_gc_caches();
1180 if (err)
1181 goto free_segment_manager_caches;
1182 err = create_checkpoint_caches();
1183 if (err)
1184 goto free_gc_caches;
1185 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1186 if (!f2fs_kset) {
1187 err = -ENOMEM;
1188 goto free_checkpoint_caches;
1189 }
1190 err = register_filesystem(&f2fs_fs_type);
1191 if (err)
1192 goto free_kset;
1193 f2fs_create_root_stats();
1194 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1195 return 0;
1196
1197 free_kset:
1198 kset_unregister(f2fs_kset);
1199 free_checkpoint_caches:
1200 destroy_checkpoint_caches();
1201 free_gc_caches:
1202 destroy_gc_caches();
1203 free_segment_manager_caches:
1204 destroy_segment_manager_caches();
1205 free_node_manager_caches:
1206 destroy_node_manager_caches();
1207 free_inodecache:
1208 destroy_inodecache();
1209 fail:
1210 return err;
1211 }
1212
1213 static void __exit exit_f2fs_fs(void)
1214 {
1215 remove_proc_entry("fs/f2fs", NULL);
1216 f2fs_destroy_root_stats();
1217 unregister_filesystem(&f2fs_fs_type);
1218 destroy_checkpoint_caches();
1219 destroy_gc_caches();
1220 destroy_segment_manager_caches();
1221 destroy_node_manager_caches();
1222 destroy_inodecache();
1223 kset_unregister(f2fs_kset);
1224 }
1225
1226 module_init(init_f2fs_fs)
1227 module_exit(exit_f2fs_fs)
1228
1229 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1230 MODULE_DESCRIPTION("Flash Friendly File System");
1231 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
This page took 0.056586 seconds and 5 git commands to generate.