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1a85f83abd53262f9f1e7c5b71cb38919e85ab22
[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_err,
55 };
56
57 static match_table_t f2fs_tokens = {
58 {Opt_gc_background, "background_gc=%s"},
59 {Opt_disable_roll_forward, "disable_roll_forward"},
60 {Opt_discard, "discard"},
61 {Opt_noheap, "no_heap"},
62 {Opt_user_xattr, "user_xattr"},
63 {Opt_nouser_xattr, "nouser_xattr"},
64 {Opt_acl, "acl"},
65 {Opt_noacl, "noacl"},
66 {Opt_active_logs, "active_logs=%u"},
67 {Opt_disable_ext_identify, "disable_ext_identify"},
68 {Opt_inline_xattr, "inline_xattr"},
69 {Opt_inline_data, "inline_data"},
70 {Opt_err, NULL},
71 };
72
73 /* Sysfs support for f2fs */
74 enum {
75 GC_THREAD, /* struct f2fs_gc_thread */
76 SM_INFO, /* struct f2fs_sm_info */
77 F2FS_SBI, /* struct f2fs_sb_info */
78 };
79
80 struct f2fs_attr {
81 struct attribute attr;
82 ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
83 ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
84 const char *, size_t);
85 int struct_type;
86 int offset;
87 };
88
89 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
90 {
91 if (struct_type == GC_THREAD)
92 return (unsigned char *)sbi->gc_thread;
93 else if (struct_type == SM_INFO)
94 return (unsigned char *)SM_I(sbi);
95 else if (struct_type == F2FS_SBI)
96 return (unsigned char *)sbi;
97 return NULL;
98 }
99
100 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
101 struct f2fs_sb_info *sbi, char *buf)
102 {
103 unsigned char *ptr = NULL;
104 unsigned int *ui;
105
106 ptr = __struct_ptr(sbi, a->struct_type);
107 if (!ptr)
108 return -EINVAL;
109
110 ui = (unsigned int *)(ptr + a->offset);
111
112 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
113 }
114
115 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
116 struct f2fs_sb_info *sbi,
117 const char *buf, size_t count)
118 {
119 unsigned char *ptr;
120 unsigned long t;
121 unsigned int *ui;
122 ssize_t ret;
123
124 ptr = __struct_ptr(sbi, a->struct_type);
125 if (!ptr)
126 return -EINVAL;
127
128 ui = (unsigned int *)(ptr + a->offset);
129
130 ret = kstrtoul(skip_spaces(buf), 0, &t);
131 if (ret < 0)
132 return ret;
133 *ui = t;
134 return count;
135 }
136
137 static ssize_t f2fs_attr_show(struct kobject *kobj,
138 struct attribute *attr, char *buf)
139 {
140 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
141 s_kobj);
142 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
143
144 return a->show ? a->show(a, sbi, buf) : 0;
145 }
146
147 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
148 const char *buf, size_t len)
149 {
150 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
151 s_kobj);
152 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
153
154 return a->store ? a->store(a, sbi, buf, len) : 0;
155 }
156
157 static void f2fs_sb_release(struct kobject *kobj)
158 {
159 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
160 s_kobj);
161 complete(&sbi->s_kobj_unregister);
162 }
163
164 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
165 static struct f2fs_attr f2fs_attr_##_name = { \
166 .attr = {.name = __stringify(_name), .mode = _mode }, \
167 .show = _show, \
168 .store = _store, \
169 .struct_type = _struct_type, \
170 .offset = _offset \
171 }
172
173 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \
174 F2FS_ATTR_OFFSET(struct_type, name, 0644, \
175 f2fs_sbi_show, f2fs_sbi_store, \
176 offsetof(struct struct_name, elname))
177
178 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
179 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
180 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
181 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
182 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
183 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
184 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
185 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
186 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
187
188 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
189 static struct attribute *f2fs_attrs[] = {
190 ATTR_LIST(gc_min_sleep_time),
191 ATTR_LIST(gc_max_sleep_time),
192 ATTR_LIST(gc_no_gc_sleep_time),
193 ATTR_LIST(gc_idle),
194 ATTR_LIST(reclaim_segments),
195 ATTR_LIST(max_small_discards),
196 ATTR_LIST(ipu_policy),
197 ATTR_LIST(min_ipu_util),
198 ATTR_LIST(max_victim_search),
199 NULL,
200 };
201
202 static const struct sysfs_ops f2fs_attr_ops = {
203 .show = f2fs_attr_show,
204 .store = f2fs_attr_store,
205 };
206
207 static struct kobj_type f2fs_ktype = {
208 .default_attrs = f2fs_attrs,
209 .sysfs_ops = &f2fs_attr_ops,
210 .release = f2fs_sb_release,
211 };
212
213 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
214 {
215 struct va_format vaf;
216 va_list args;
217
218 va_start(args, fmt);
219 vaf.fmt = fmt;
220 vaf.va = &args;
221 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
222 va_end(args);
223 }
224
225 static void init_once(void *foo)
226 {
227 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
228
229 inode_init_once(&fi->vfs_inode);
230 }
231
232 static int parse_options(struct super_block *sb, char *options)
233 {
234 struct f2fs_sb_info *sbi = F2FS_SB(sb);
235 substring_t args[MAX_OPT_ARGS];
236 char *p, *name;
237 int arg = 0;
238
239 if (!options)
240 return 0;
241
242 while ((p = strsep(&options, ",")) != NULL) {
243 int token;
244 if (!*p)
245 continue;
246 /*
247 * Initialize args struct so we know whether arg was
248 * found; some options take optional arguments.
249 */
250 args[0].to = args[0].from = NULL;
251 token = match_token(p, f2fs_tokens, args);
252
253 switch (token) {
254 case Opt_gc_background:
255 name = match_strdup(&args[0]);
256
257 if (!name)
258 return -ENOMEM;
259 if (!strncmp(name, "on", 2))
260 set_opt(sbi, BG_GC);
261 else if (!strncmp(name, "off", 3))
262 clear_opt(sbi, BG_GC);
263 else {
264 kfree(name);
265 return -EINVAL;
266 }
267 kfree(name);
268 break;
269 case Opt_disable_roll_forward:
270 set_opt(sbi, DISABLE_ROLL_FORWARD);
271 break;
272 case Opt_discard:
273 set_opt(sbi, DISCARD);
274 break;
275 case Opt_noheap:
276 set_opt(sbi, NOHEAP);
277 break;
278 #ifdef CONFIG_F2FS_FS_XATTR
279 case Opt_user_xattr:
280 set_opt(sbi, XATTR_USER);
281 break;
282 case Opt_nouser_xattr:
283 clear_opt(sbi, XATTR_USER);
284 break;
285 case Opt_inline_xattr:
286 set_opt(sbi, INLINE_XATTR);
287 break;
288 #else
289 case Opt_user_xattr:
290 f2fs_msg(sb, KERN_INFO,
291 "user_xattr options not supported");
292 break;
293 case Opt_nouser_xattr:
294 f2fs_msg(sb, KERN_INFO,
295 "nouser_xattr options not supported");
296 break;
297 case Opt_inline_xattr:
298 f2fs_msg(sb, KERN_INFO,
299 "inline_xattr options not supported");
300 break;
301 #endif
302 #ifdef CONFIG_F2FS_FS_POSIX_ACL
303 case Opt_acl:
304 set_opt(sbi, POSIX_ACL);
305 break;
306 case Opt_noacl:
307 clear_opt(sbi, POSIX_ACL);
308 break;
309 #else
310 case Opt_acl:
311 f2fs_msg(sb, KERN_INFO, "acl options not supported");
312 break;
313 case Opt_noacl:
314 f2fs_msg(sb, KERN_INFO, "noacl options not supported");
315 break;
316 #endif
317 case Opt_active_logs:
318 if (args->from && match_int(args, &arg))
319 return -EINVAL;
320 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
321 return -EINVAL;
322 sbi->active_logs = arg;
323 break;
324 case Opt_disable_ext_identify:
325 set_opt(sbi, DISABLE_EXT_IDENTIFY);
326 break;
327 case Opt_inline_data:
328 set_opt(sbi, INLINE_DATA);
329 break;
330 default:
331 f2fs_msg(sb, KERN_ERR,
332 "Unrecognized mount option \"%s\" or missing value",
333 p);
334 return -EINVAL;
335 }
336 }
337 return 0;
338 }
339
340 static struct inode *f2fs_alloc_inode(struct super_block *sb)
341 {
342 struct f2fs_inode_info *fi;
343
344 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
345 if (!fi)
346 return NULL;
347
348 init_once((void *) fi);
349
350 /* Initialize f2fs-specific inode info */
351 fi->vfs_inode.i_version = 1;
352 atomic_set(&fi->dirty_dents, 0);
353 fi->i_current_depth = 1;
354 fi->i_advise = 0;
355 rwlock_init(&fi->ext.ext_lock);
356
357 set_inode_flag(fi, FI_NEW_INODE);
358
359 if (test_opt(F2FS_SB(sb), INLINE_XATTR))
360 set_inode_flag(fi, FI_INLINE_XATTR);
361
362 return &fi->vfs_inode;
363 }
364
365 static int f2fs_drop_inode(struct inode *inode)
366 {
367 /*
368 * This is to avoid a deadlock condition like below.
369 * writeback_single_inode(inode)
370 * - f2fs_write_data_page
371 * - f2fs_gc -> iput -> evict
372 * - inode_wait_for_writeback(inode)
373 */
374 if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
375 return 0;
376 return generic_drop_inode(inode);
377 }
378
379 /*
380 * f2fs_dirty_inode() is called from __mark_inode_dirty()
381 *
382 * We should call set_dirty_inode to write the dirty inode through write_inode.
383 */
384 static void f2fs_dirty_inode(struct inode *inode, int flags)
385 {
386 set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
387 }
388
389 static void f2fs_i_callback(struct rcu_head *head)
390 {
391 struct inode *inode = container_of(head, struct inode, i_rcu);
392 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
393 }
394
395 static void f2fs_destroy_inode(struct inode *inode)
396 {
397 call_rcu(&inode->i_rcu, f2fs_i_callback);
398 }
399
400 static void f2fs_put_super(struct super_block *sb)
401 {
402 struct f2fs_sb_info *sbi = F2FS_SB(sb);
403
404 if (sbi->s_proc) {
405 remove_proc_entry("segment_info", sbi->s_proc);
406 remove_proc_entry(sb->s_id, f2fs_proc_root);
407 }
408 kobject_del(&sbi->s_kobj);
409
410 f2fs_destroy_stats(sbi);
411 stop_gc_thread(sbi);
412
413 /* We don't need to do checkpoint when it's clean */
414 if (sbi->s_dirty && get_pages(sbi, F2FS_DIRTY_NODES))
415 write_checkpoint(sbi, true);
416
417 iput(sbi->node_inode);
418 iput(sbi->meta_inode);
419
420 /* destroy f2fs internal modules */
421 destroy_node_manager(sbi);
422 destroy_segment_manager(sbi);
423
424 kfree(sbi->ckpt);
425 kobject_put(&sbi->s_kobj);
426 wait_for_completion(&sbi->s_kobj_unregister);
427
428 sb->s_fs_info = NULL;
429 brelse(sbi->raw_super_buf);
430 kfree(sbi);
431 }
432
433 int f2fs_sync_fs(struct super_block *sb, int sync)
434 {
435 struct f2fs_sb_info *sbi = F2FS_SB(sb);
436
437 trace_f2fs_sync_fs(sb, sync);
438
439 if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
440 return 0;
441
442 if (sync) {
443 mutex_lock(&sbi->gc_mutex);
444 write_checkpoint(sbi, false);
445 mutex_unlock(&sbi->gc_mutex);
446 } else {
447 f2fs_balance_fs(sbi);
448 }
449
450 return 0;
451 }
452
453 static int f2fs_freeze(struct super_block *sb)
454 {
455 int err;
456
457 if (f2fs_readonly(sb))
458 return 0;
459
460 err = f2fs_sync_fs(sb, 1);
461 return err;
462 }
463
464 static int f2fs_unfreeze(struct super_block *sb)
465 {
466 return 0;
467 }
468
469 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
470 {
471 struct super_block *sb = dentry->d_sb;
472 struct f2fs_sb_info *sbi = F2FS_SB(sb);
473 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
474 block_t total_count, user_block_count, start_count, ovp_count;
475
476 total_count = le64_to_cpu(sbi->raw_super->block_count);
477 user_block_count = sbi->user_block_count;
478 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
479 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
480 buf->f_type = F2FS_SUPER_MAGIC;
481 buf->f_bsize = sbi->blocksize;
482
483 buf->f_blocks = total_count - start_count;
484 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
485 buf->f_bavail = user_block_count - valid_user_blocks(sbi);
486
487 buf->f_files = sbi->total_node_count;
488 buf->f_ffree = sbi->total_node_count - valid_inode_count(sbi);
489
490 buf->f_namelen = F2FS_NAME_LEN;
491 buf->f_fsid.val[0] = (u32)id;
492 buf->f_fsid.val[1] = (u32)(id >> 32);
493
494 return 0;
495 }
496
497 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
498 {
499 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
500
501 if (!(root->d_sb->s_flags & MS_RDONLY) && test_opt(sbi, BG_GC))
502 seq_printf(seq, ",background_gc=%s", "on");
503 else
504 seq_printf(seq, ",background_gc=%s", "off");
505 if (test_opt(sbi, DISABLE_ROLL_FORWARD))
506 seq_puts(seq, ",disable_roll_forward");
507 if (test_opt(sbi, DISCARD))
508 seq_puts(seq, ",discard");
509 if (test_opt(sbi, NOHEAP))
510 seq_puts(seq, ",no_heap_alloc");
511 #ifdef CONFIG_F2FS_FS_XATTR
512 if (test_opt(sbi, XATTR_USER))
513 seq_puts(seq, ",user_xattr");
514 else
515 seq_puts(seq, ",nouser_xattr");
516 if (test_opt(sbi, INLINE_XATTR))
517 seq_puts(seq, ",inline_xattr");
518 #endif
519 #ifdef CONFIG_F2FS_FS_POSIX_ACL
520 if (test_opt(sbi, POSIX_ACL))
521 seq_puts(seq, ",acl");
522 else
523 seq_puts(seq, ",noacl");
524 #endif
525 if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
526 seq_puts(seq, ",disable_ext_identify");
527 if (test_opt(sbi, INLINE_DATA))
528 seq_puts(seq, ",inline_data");
529 seq_printf(seq, ",active_logs=%u", sbi->active_logs);
530
531 return 0;
532 }
533
534 static int segment_info_seq_show(struct seq_file *seq, void *offset)
535 {
536 struct super_block *sb = seq->private;
537 struct f2fs_sb_info *sbi = F2FS_SB(sb);
538 unsigned int total_segs =
539 le32_to_cpu(sbi->raw_super->segment_count_main);
540 int i;
541
542 for (i = 0; i < total_segs; i++) {
543 seq_printf(seq, "%u", get_valid_blocks(sbi, i, 1));
544 if (i != 0 && (i % 10) == 0)
545 seq_puts(seq, "\n");
546 else
547 seq_puts(seq, " ");
548 }
549 return 0;
550 }
551
552 static int segment_info_open_fs(struct inode *inode, struct file *file)
553 {
554 return single_open(file, segment_info_seq_show, PDE_DATA(inode));
555 }
556
557 static const struct file_operations f2fs_seq_segment_info_fops = {
558 .owner = THIS_MODULE,
559 .open = segment_info_open_fs,
560 .read = seq_read,
561 .llseek = seq_lseek,
562 .release = single_release,
563 };
564
565 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
566 {
567 struct f2fs_sb_info *sbi = F2FS_SB(sb);
568 struct f2fs_mount_info org_mount_opt;
569 int err, active_logs;
570
571 /*
572 * Save the old mount options in case we
573 * need to restore them.
574 */
575 org_mount_opt = sbi->mount_opt;
576 active_logs = sbi->active_logs;
577
578 /* parse mount options */
579 err = parse_options(sb, data);
580 if (err)
581 goto restore_opts;
582
583 /*
584 * Previous and new state of filesystem is RO,
585 * so no point in checking GC conditions.
586 */
587 if ((sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY))
588 goto skip;
589
590 /*
591 * We stop the GC thread if FS is mounted as RO
592 * or if background_gc = off is passed in mount
593 * option. Also sync the filesystem.
594 */
595 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
596 if (sbi->gc_thread) {
597 stop_gc_thread(sbi);
598 f2fs_sync_fs(sb, 1);
599 }
600 } else if (test_opt(sbi, BG_GC) && !sbi->gc_thread) {
601 err = start_gc_thread(sbi);
602 if (err)
603 goto restore_opts;
604 }
605 skip:
606 /* Update the POSIXACL Flag */
607 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
608 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
609 return 0;
610
611 restore_opts:
612 sbi->mount_opt = org_mount_opt;
613 sbi->active_logs = active_logs;
614 return err;
615 }
616
617 static struct super_operations f2fs_sops = {
618 .alloc_inode = f2fs_alloc_inode,
619 .drop_inode = f2fs_drop_inode,
620 .destroy_inode = f2fs_destroy_inode,
621 .write_inode = f2fs_write_inode,
622 .dirty_inode = f2fs_dirty_inode,
623 .show_options = f2fs_show_options,
624 .evict_inode = f2fs_evict_inode,
625 .put_super = f2fs_put_super,
626 .sync_fs = f2fs_sync_fs,
627 .freeze_fs = f2fs_freeze,
628 .unfreeze_fs = f2fs_unfreeze,
629 .statfs = f2fs_statfs,
630 .remount_fs = f2fs_remount,
631 };
632
633 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
634 u64 ino, u32 generation)
635 {
636 struct f2fs_sb_info *sbi = F2FS_SB(sb);
637 struct inode *inode;
638
639 if (unlikely(ino < F2FS_ROOT_INO(sbi)))
640 return ERR_PTR(-ESTALE);
641
642 /*
643 * f2fs_iget isn't quite right if the inode is currently unallocated!
644 * However f2fs_iget currently does appropriate checks to handle stale
645 * inodes so everything is OK.
646 */
647 inode = f2fs_iget(sb, ino);
648 if (IS_ERR(inode))
649 return ERR_CAST(inode);
650 if (unlikely(generation && inode->i_generation != generation)) {
651 /* we didn't find the right inode.. */
652 iput(inode);
653 return ERR_PTR(-ESTALE);
654 }
655 return inode;
656 }
657
658 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
659 int fh_len, int fh_type)
660 {
661 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
662 f2fs_nfs_get_inode);
663 }
664
665 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
666 int fh_len, int fh_type)
667 {
668 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
669 f2fs_nfs_get_inode);
670 }
671
672 static const struct export_operations f2fs_export_ops = {
673 .fh_to_dentry = f2fs_fh_to_dentry,
674 .fh_to_parent = f2fs_fh_to_parent,
675 .get_parent = f2fs_get_parent,
676 };
677
678 static loff_t max_file_size(unsigned bits)
679 {
680 loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
681 loff_t leaf_count = ADDRS_PER_BLOCK;
682
683 /* two direct node blocks */
684 result += (leaf_count * 2);
685
686 /* two indirect node blocks */
687 leaf_count *= NIDS_PER_BLOCK;
688 result += (leaf_count * 2);
689
690 /* one double indirect node block */
691 leaf_count *= NIDS_PER_BLOCK;
692 result += leaf_count;
693
694 result <<= bits;
695 return result;
696 }
697
698 static int sanity_check_raw_super(struct super_block *sb,
699 struct f2fs_super_block *raw_super)
700 {
701 unsigned int blocksize;
702
703 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
704 f2fs_msg(sb, KERN_INFO,
705 "Magic Mismatch, valid(0x%x) - read(0x%x)",
706 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
707 return 1;
708 }
709
710 /* Currently, support only 4KB page cache size */
711 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
712 f2fs_msg(sb, KERN_INFO,
713 "Invalid page_cache_size (%lu), supports only 4KB\n",
714 PAGE_CACHE_SIZE);
715 return 1;
716 }
717
718 /* Currently, support only 4KB block size */
719 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
720 if (blocksize != F2FS_BLKSIZE) {
721 f2fs_msg(sb, KERN_INFO,
722 "Invalid blocksize (%u), supports only 4KB\n",
723 blocksize);
724 return 1;
725 }
726
727 if (le32_to_cpu(raw_super->log_sectorsize) !=
728 F2FS_LOG_SECTOR_SIZE) {
729 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize");
730 return 1;
731 }
732 if (le32_to_cpu(raw_super->log_sectors_per_block) !=
733 F2FS_LOG_SECTORS_PER_BLOCK) {
734 f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block");
735 return 1;
736 }
737 return 0;
738 }
739
740 static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
741 {
742 unsigned int total, fsmeta;
743 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
744 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
745
746 total = le32_to_cpu(raw_super->segment_count);
747 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
748 fsmeta += le32_to_cpu(raw_super->segment_count_sit);
749 fsmeta += le32_to_cpu(raw_super->segment_count_nat);
750 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
751 fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
752
753 if (unlikely(fsmeta >= total))
754 return 1;
755
756 if (unlikely(is_set_ckpt_flags(ckpt, CP_ERROR_FLAG))) {
757 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
758 return 1;
759 }
760 return 0;
761 }
762
763 static void init_sb_info(struct f2fs_sb_info *sbi)
764 {
765 struct f2fs_super_block *raw_super = sbi->raw_super;
766 int i;
767
768 sbi->log_sectors_per_block =
769 le32_to_cpu(raw_super->log_sectors_per_block);
770 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
771 sbi->blocksize = 1 << sbi->log_blocksize;
772 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
773 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
774 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
775 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
776 sbi->total_sections = le32_to_cpu(raw_super->section_count);
777 sbi->total_node_count =
778 (le32_to_cpu(raw_super->segment_count_nat) / 2)
779 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
780 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
781 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
782 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
783 sbi->cur_victim_sec = NULL_SECNO;
784 sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
785
786 for (i = 0; i < NR_COUNT_TYPE; i++)
787 atomic_set(&sbi->nr_pages[i], 0);
788 }
789
790 /*
791 * Read f2fs raw super block.
792 * Because we have two copies of super block, so read the first one at first,
793 * if the first one is invalid, move to read the second one.
794 */
795 static int read_raw_super_block(struct super_block *sb,
796 struct f2fs_super_block **raw_super,
797 struct buffer_head **raw_super_buf)
798 {
799 int block = 0;
800
801 retry:
802 *raw_super_buf = sb_bread(sb, block);
803 if (!*raw_super_buf) {
804 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
805 block + 1);
806 if (block == 0) {
807 block++;
808 goto retry;
809 } else {
810 return -EIO;
811 }
812 }
813
814 *raw_super = (struct f2fs_super_block *)
815 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
816
817 /* sanity checking of raw super */
818 if (sanity_check_raw_super(sb, *raw_super)) {
819 brelse(*raw_super_buf);
820 f2fs_msg(sb, KERN_ERR,
821 "Can't find valid F2FS filesystem in %dth superblock",
822 block + 1);
823 if (block == 0) {
824 block++;
825 goto retry;
826 } else {
827 return -EINVAL;
828 }
829 }
830
831 return 0;
832 }
833
834 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
835 {
836 struct f2fs_sb_info *sbi;
837 struct f2fs_super_block *raw_super;
838 struct buffer_head *raw_super_buf;
839 struct inode *root;
840 long err = -EINVAL;
841 int i;
842
843 /* allocate memory for f2fs-specific super block info */
844 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
845 if (!sbi)
846 return -ENOMEM;
847
848 /* set a block size */
849 if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
850 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
851 goto free_sbi;
852 }
853
854 err = read_raw_super_block(sb, &raw_super, &raw_super_buf);
855 if (err)
856 goto free_sbi;
857
858 sb->s_fs_info = sbi;
859 /* init some FS parameters */
860 sbi->active_logs = NR_CURSEG_TYPE;
861
862 set_opt(sbi, BG_GC);
863
864 #ifdef CONFIG_F2FS_FS_XATTR
865 set_opt(sbi, XATTR_USER);
866 #endif
867 #ifdef CONFIG_F2FS_FS_POSIX_ACL
868 set_opt(sbi, POSIX_ACL);
869 #endif
870 /* parse mount options */
871 err = parse_options(sb, (char *)data);
872 if (err)
873 goto free_sb_buf;
874
875 sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
876 sb->s_max_links = F2FS_LINK_MAX;
877 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
878
879 sb->s_op = &f2fs_sops;
880 sb->s_xattr = f2fs_xattr_handlers;
881 sb->s_export_op = &f2fs_export_ops;
882 sb->s_magic = F2FS_SUPER_MAGIC;
883 sb->s_time_gran = 1;
884 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
885 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
886 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
887
888 /* init f2fs-specific super block info */
889 sbi->sb = sb;
890 sbi->raw_super = raw_super;
891 sbi->raw_super_buf = raw_super_buf;
892 mutex_init(&sbi->gc_mutex);
893 mutex_init(&sbi->writepages);
894 mutex_init(&sbi->cp_mutex);
895 mutex_init(&sbi->node_write);
896 sbi->por_doing = false;
897 spin_lock_init(&sbi->stat_lock);
898
899 mutex_init(&sbi->read_io.io_mutex);
900 sbi->read_io.sbi = sbi;
901 sbi->read_io.bio = NULL;
902 for (i = 0; i < NR_PAGE_TYPE; i++) {
903 mutex_init(&sbi->write_io[i].io_mutex);
904 sbi->write_io[i].sbi = sbi;
905 sbi->write_io[i].bio = NULL;
906 }
907
908 init_rwsem(&sbi->cp_rwsem);
909 init_waitqueue_head(&sbi->cp_wait);
910 init_sb_info(sbi);
911
912 /* get an inode for meta space */
913 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
914 if (IS_ERR(sbi->meta_inode)) {
915 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
916 err = PTR_ERR(sbi->meta_inode);
917 goto free_sb_buf;
918 }
919
920 err = get_valid_checkpoint(sbi);
921 if (err) {
922 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
923 goto free_meta_inode;
924 }
925
926 /* sanity checking of checkpoint */
927 err = -EINVAL;
928 if (sanity_check_ckpt(sbi)) {
929 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
930 goto free_cp;
931 }
932
933 sbi->total_valid_node_count =
934 le32_to_cpu(sbi->ckpt->valid_node_count);
935 sbi->total_valid_inode_count =
936 le32_to_cpu(sbi->ckpt->valid_inode_count);
937 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
938 sbi->total_valid_block_count =
939 le64_to_cpu(sbi->ckpt->valid_block_count);
940 sbi->last_valid_block_count = sbi->total_valid_block_count;
941 sbi->alloc_valid_block_count = 0;
942 INIT_LIST_HEAD(&sbi->dir_inode_list);
943 spin_lock_init(&sbi->dir_inode_lock);
944
945 init_orphan_info(sbi);
946
947 /* setup f2fs internal modules */
948 err = build_segment_manager(sbi);
949 if (err) {
950 f2fs_msg(sb, KERN_ERR,
951 "Failed to initialize F2FS segment manager");
952 goto free_sm;
953 }
954 err = build_node_manager(sbi);
955 if (err) {
956 f2fs_msg(sb, KERN_ERR,
957 "Failed to initialize F2FS node manager");
958 goto free_nm;
959 }
960
961 build_gc_manager(sbi);
962
963 /* get an inode for node space */
964 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
965 if (IS_ERR(sbi->node_inode)) {
966 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
967 err = PTR_ERR(sbi->node_inode);
968 goto free_nm;
969 }
970
971 /* if there are nt orphan nodes free them */
972 recover_orphan_inodes(sbi);
973
974 /* read root inode and dentry */
975 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
976 if (IS_ERR(root)) {
977 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
978 err = PTR_ERR(root);
979 goto free_node_inode;
980 }
981 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
982 err = -EINVAL;
983 goto free_root_inode;
984 }
985
986 sb->s_root = d_make_root(root); /* allocate root dentry */
987 if (!sb->s_root) {
988 err = -ENOMEM;
989 goto free_root_inode;
990 }
991
992 /* recover fsynced data */
993 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
994 err = recover_fsync_data(sbi);
995 if (err)
996 f2fs_msg(sb, KERN_ERR,
997 "Cannot recover all fsync data errno=%ld", err);
998 }
999
1000 /*
1001 * If filesystem is not mounted as read-only then
1002 * do start the gc_thread.
1003 */
1004 if (!(sb->s_flags & MS_RDONLY)) {
1005 /* After POR, we can run background GC thread.*/
1006 err = start_gc_thread(sbi);
1007 if (err)
1008 goto free_gc;
1009 }
1010
1011 err = f2fs_build_stats(sbi);
1012 if (err)
1013 goto free_gc;
1014
1015 if (f2fs_proc_root)
1016 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1017
1018 if (sbi->s_proc)
1019 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1020 &f2fs_seq_segment_info_fops, sb);
1021
1022 if (test_opt(sbi, DISCARD)) {
1023 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1024 if (!blk_queue_discard(q))
1025 f2fs_msg(sb, KERN_WARNING,
1026 "mounting with \"discard\" option, but "
1027 "the device does not support discard");
1028 }
1029
1030 sbi->s_kobj.kset = f2fs_kset;
1031 init_completion(&sbi->s_kobj_unregister);
1032 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1033 "%s", sb->s_id);
1034 if (err)
1035 goto fail;
1036
1037 return 0;
1038 fail:
1039 if (sbi->s_proc) {
1040 remove_proc_entry("segment_info", sbi->s_proc);
1041 remove_proc_entry(sb->s_id, f2fs_proc_root);
1042 }
1043 f2fs_destroy_stats(sbi);
1044 free_gc:
1045 stop_gc_thread(sbi);
1046 free_root_inode:
1047 dput(sb->s_root);
1048 sb->s_root = NULL;
1049 free_node_inode:
1050 iput(sbi->node_inode);
1051 free_nm:
1052 destroy_node_manager(sbi);
1053 free_sm:
1054 destroy_segment_manager(sbi);
1055 free_cp:
1056 kfree(sbi->ckpt);
1057 free_meta_inode:
1058 make_bad_inode(sbi->meta_inode);
1059 iput(sbi->meta_inode);
1060 free_sb_buf:
1061 brelse(raw_super_buf);
1062 free_sbi:
1063 kfree(sbi);
1064 return err;
1065 }
1066
1067 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1068 const char *dev_name, void *data)
1069 {
1070 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1071 }
1072
1073 static struct file_system_type f2fs_fs_type = {
1074 .owner = THIS_MODULE,
1075 .name = "f2fs",
1076 .mount = f2fs_mount,
1077 .kill_sb = kill_block_super,
1078 .fs_flags = FS_REQUIRES_DEV,
1079 };
1080 MODULE_ALIAS_FS("f2fs");
1081
1082 static int __init init_inodecache(void)
1083 {
1084 f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
1085 sizeof(struct f2fs_inode_info), NULL);
1086 if (!f2fs_inode_cachep)
1087 return -ENOMEM;
1088 return 0;
1089 }
1090
1091 static void destroy_inodecache(void)
1092 {
1093 /*
1094 * Make sure all delayed rcu free inodes are flushed before we
1095 * destroy cache.
1096 */
1097 rcu_barrier();
1098 kmem_cache_destroy(f2fs_inode_cachep);
1099 }
1100
1101 static int __init init_f2fs_fs(void)
1102 {
1103 int err;
1104
1105 err = init_inodecache();
1106 if (err)
1107 goto fail;
1108 err = create_node_manager_caches();
1109 if (err)
1110 goto free_inodecache;
1111 err = create_segment_manager_caches();
1112 if (err)
1113 goto free_node_manager_caches;
1114 err = create_gc_caches();
1115 if (err)
1116 goto free_segment_manager_caches;
1117 err = create_checkpoint_caches();
1118 if (err)
1119 goto free_gc_caches;
1120 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1121 if (!f2fs_kset) {
1122 err = -ENOMEM;
1123 goto free_checkpoint_caches;
1124 }
1125 err = register_filesystem(&f2fs_fs_type);
1126 if (err)
1127 goto free_kset;
1128 f2fs_create_root_stats();
1129 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1130 return 0;
1131
1132 free_kset:
1133 kset_unregister(f2fs_kset);
1134 free_checkpoint_caches:
1135 destroy_checkpoint_caches();
1136 free_gc_caches:
1137 destroy_gc_caches();
1138 free_segment_manager_caches:
1139 destroy_segment_manager_caches();
1140 free_node_manager_caches:
1141 destroy_node_manager_caches();
1142 free_inodecache:
1143 destroy_inodecache();
1144 fail:
1145 return err;
1146 }
1147
1148 static void __exit exit_f2fs_fs(void)
1149 {
1150 remove_proc_entry("fs/f2fs", NULL);
1151 f2fs_destroy_root_stats();
1152 unregister_filesystem(&f2fs_fs_type);
1153 destroy_checkpoint_caches();
1154 destroy_gc_caches();
1155 destroy_segment_manager_caches();
1156 destroy_node_manager_caches();
1157 destroy_inodecache();
1158 kset_unregister(f2fs_kset);
1159 }
1160
1161 module_init(init_f2fs_fs)
1162 module_exit(exit_f2fs_fs)
1163
1164 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1165 MODULE_DESCRIPTION("Flash Friendly File System");
1166 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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