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Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[linux-2.6.git] / fs / f2fs / super.c
blobbafff72de8e841afba9d609a8001c71af67f42fc
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_err,
54 };
55
56 static match_table_t f2fs_tokens = {
57 {Opt_gc_background, "background_gc=%s"},
58 {Opt_disable_roll_forward, "disable_roll_forward"},
59 {Opt_discard, "discard"},
60 {Opt_noheap, "no_heap"},
61 {Opt_user_xattr, "user_xattr"},
62 {Opt_nouser_xattr, "nouser_xattr"},
63 {Opt_acl, "acl"},
64 {Opt_noacl, "noacl"},
65 {Opt_active_logs, "active_logs=%u"},
66 {Opt_disable_ext_identify, "disable_ext_identify"},
67 {Opt_inline_xattr, "inline_xattr"},
68 {Opt_err, NULL},
69 };
70
71 /* Sysfs support for f2fs */
72 enum {
73 GC_THREAD, /* struct f2fs_gc_thread */
74 SM_INFO, /* struct f2fs_sm_info */
75 };
76
77 struct f2fs_attr {
78 struct attribute attr;
79 ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
80 ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
81 const char *, size_t);
82 int struct_type;
83 int offset;
84 };
85
86 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
87 {
88 if (struct_type == GC_THREAD)
89 return (unsigned char *)sbi->gc_thread;
90 else if (struct_type == SM_INFO)
91 return (unsigned char *)SM_I(sbi);
92 return NULL;
93 }
94
95 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
96 struct f2fs_sb_info *sbi, char *buf)
97 {
98 unsigned char *ptr = NULL;
99 unsigned int *ui;
100
101 ptr = __struct_ptr(sbi, a->struct_type);
102 if (!ptr)
103 return -EINVAL;
104
105 ui = (unsigned int *)(ptr + a->offset);
106
107 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
108 }
109
110 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
111 struct f2fs_sb_info *sbi,
112 const char *buf, size_t count)
113 {
114 unsigned char *ptr;
115 unsigned long t;
116 unsigned int *ui;
117 ssize_t ret;
118
119 ptr = __struct_ptr(sbi, a->struct_type);
120 if (!ptr)
121 return -EINVAL;
122
123 ui = (unsigned int *)(ptr + a->offset);
124
125 ret = kstrtoul(skip_spaces(buf), 0, &t);
126 if (ret < 0)
127 return ret;
128 *ui = t;
129 return count;
130 }
131
132 static ssize_t f2fs_attr_show(struct kobject *kobj,
133 struct attribute *attr, char *buf)
134 {
135 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
136 s_kobj);
137 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
138
139 return a->show ? a->show(a, sbi, buf) : 0;
140 }
141
142 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
143 const char *buf, size_t len)
144 {
145 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
146 s_kobj);
147 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
148
149 return a->store ? a->store(a, sbi, buf, len) : 0;
150 }
151
152 static void f2fs_sb_release(struct kobject *kobj)
153 {
154 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
155 s_kobj);
156 complete(&sbi->s_kobj_unregister);
157 }
158
159 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
160 static struct f2fs_attr f2fs_attr_##_name = { \
161 .attr = {.name = __stringify(_name), .mode = _mode }, \
162 .show = _show, \
163 .store = _store, \
164 .struct_type = _struct_type, \
165 .offset = _offset \
166 }
167
168 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \
169 F2FS_ATTR_OFFSET(struct_type, name, 0644, \
170 f2fs_sbi_show, f2fs_sbi_store, \
171 offsetof(struct struct_name, elname))
172
173 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
174 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
175 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
176 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
177 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
178
179 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
180 static struct attribute *f2fs_attrs[] = {
181 ATTR_LIST(gc_min_sleep_time),
182 ATTR_LIST(gc_max_sleep_time),
183 ATTR_LIST(gc_no_gc_sleep_time),
184 ATTR_LIST(gc_idle),
185 ATTR_LIST(reclaim_segments),
186 NULL,
187 };
188
189 static const struct sysfs_ops f2fs_attr_ops = {
190 .show = f2fs_attr_show,
191 .store = f2fs_attr_store,
192 };
193
194 static struct kobj_type f2fs_ktype = {
195 .default_attrs = f2fs_attrs,
196 .sysfs_ops = &f2fs_attr_ops,
197 .release = f2fs_sb_release,
198 };
199
200 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
201 {
202 struct va_format vaf;
203 va_list args;
204
205 va_start(args, fmt);
206 vaf.fmt = fmt;
207 vaf.va = &args;
208 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
209 va_end(args);
210 }
211
212 static void init_once(void *foo)
213 {
214 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
215
216 inode_init_once(&fi->vfs_inode);
217 }
218
219 static int parse_options(struct super_block *sb, char *options)
220 {
221 struct f2fs_sb_info *sbi = F2FS_SB(sb);
222 substring_t args[MAX_OPT_ARGS];
223 char *p, *name;
224 int arg = 0;
225
226 if (!options)
227 return 0;
228
229 while ((p = strsep(&options, ",")) != NULL) {
230 int token;
231 if (!*p)
232 continue;
233 /*
234 * Initialize args struct so we know whether arg was
235 * found; some options take optional arguments.
236 */
237 args[0].to = args[0].from = NULL;
238 token = match_token(p, f2fs_tokens, args);
239
240 switch (token) {
241 case Opt_gc_background:
242 name = match_strdup(&args[0]);
243
244 if (!name)
245 return -ENOMEM;
246 if (!strncmp(name, "on", 2))
247 set_opt(sbi, BG_GC);
248 else if (!strncmp(name, "off", 3))
249 clear_opt(sbi, BG_GC);
250 else {
251 kfree(name);
252 return -EINVAL;
253 }
254 kfree(name);
255 break;
256 case Opt_disable_roll_forward:
257 set_opt(sbi, DISABLE_ROLL_FORWARD);
258 break;
259 case Opt_discard:
260 set_opt(sbi, DISCARD);
261 break;
262 case Opt_noheap:
263 set_opt(sbi, NOHEAP);
264 break;
265 #ifdef CONFIG_F2FS_FS_XATTR
266 case Opt_user_xattr:
267 set_opt(sbi, XATTR_USER);
268 break;
269 case Opt_nouser_xattr:
270 clear_opt(sbi, XATTR_USER);
271 break;
272 case Opt_inline_xattr:
273 set_opt(sbi, INLINE_XATTR);
274 break;
275 #else
276 case Opt_user_xattr:
277 f2fs_msg(sb, KERN_INFO,
278 "user_xattr options not supported");
279 break;
280 case Opt_nouser_xattr:
281 f2fs_msg(sb, KERN_INFO,
282 "nouser_xattr options not supported");
283 break;
284 case Opt_inline_xattr:
285 f2fs_msg(sb, KERN_INFO,
286 "inline_xattr options not supported");
287 break;
288 #endif
289 #ifdef CONFIG_F2FS_FS_POSIX_ACL
290 case Opt_acl:
291 set_opt(sbi, POSIX_ACL);
292 break;
293 case Opt_noacl:
294 clear_opt(sbi, POSIX_ACL);
295 break;
296 #else
297 case Opt_acl:
298 f2fs_msg(sb, KERN_INFO, "acl options not supported");
299 break;
300 case Opt_noacl:
301 f2fs_msg(sb, KERN_INFO, "noacl options not supported");
302 break;
303 #endif
304 case Opt_active_logs:
305 if (args->from && match_int(args, &arg))
306 return -EINVAL;
307 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
308 return -EINVAL;
309 sbi->active_logs = arg;
310 break;
311 case Opt_disable_ext_identify:
312 set_opt(sbi, DISABLE_EXT_IDENTIFY);
313 break;
314 default:
315 f2fs_msg(sb, KERN_ERR,
316 "Unrecognized mount option \"%s\" or missing value",
317 p);
318 return -EINVAL;
319 }
320 }
321 return 0;
322 }
323
324 static struct inode *f2fs_alloc_inode(struct super_block *sb)
325 {
326 struct f2fs_inode_info *fi;
327
328 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_NOFS | __GFP_ZERO);
329 if (!fi)
330 return NULL;
331
332 init_once((void *) fi);
333
334 /* Initialize f2fs-specific inode info */
335 fi->vfs_inode.i_version = 1;
336 atomic_set(&fi->dirty_dents, 0);
337 fi->i_current_depth = 1;
338 fi->i_advise = 0;
339 rwlock_init(&fi->ext.ext_lock);
340
341 set_inode_flag(fi, FI_NEW_INODE);
342
343 if (test_opt(F2FS_SB(sb), INLINE_XATTR))
344 set_inode_flag(fi, FI_INLINE_XATTR);
345
346 return &fi->vfs_inode;
347 }
348
349 static int f2fs_drop_inode(struct inode *inode)
350 {
351 /*
352 * This is to avoid a deadlock condition like below.
353 * writeback_single_inode(inode)
354 * - f2fs_write_data_page
355 * - f2fs_gc -> iput -> evict
356 * - inode_wait_for_writeback(inode)
357 */
358 if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
359 return 0;
360 return generic_drop_inode(inode);
361 }
362
363 /*
364 * f2fs_dirty_inode() is called from __mark_inode_dirty()
365 *
366 * We should call set_dirty_inode to write the dirty inode through write_inode.
367 */
368 static void f2fs_dirty_inode(struct inode *inode, int flags)
369 {
370 set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
371 }
372
373 static void f2fs_i_callback(struct rcu_head *head)
374 {
375 struct inode *inode = container_of(head, struct inode, i_rcu);
376 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
377 }
378
379 static void f2fs_destroy_inode(struct inode *inode)
380 {
381 call_rcu(&inode->i_rcu, f2fs_i_callback);
382 }
383
384 static void f2fs_put_super(struct super_block *sb)
385 {
386 struct f2fs_sb_info *sbi = F2FS_SB(sb);
387
388 if (sbi->s_proc) {
389 remove_proc_entry("segment_info", sbi->s_proc);
390 remove_proc_entry(sb->s_id, f2fs_proc_root);
391 }
392 kobject_del(&sbi->s_kobj);
393
394 f2fs_destroy_stats(sbi);
395 stop_gc_thread(sbi);
396
397 /* We don't need to do checkpoint when it's clean */
398 if (sbi->s_dirty && get_pages(sbi, F2FS_DIRTY_NODES))
399 write_checkpoint(sbi, true);
400
401 iput(sbi->node_inode);
402 iput(sbi->meta_inode);
403
404 /* destroy f2fs internal modules */
405 destroy_node_manager(sbi);
406 destroy_segment_manager(sbi);
407
408 kfree(sbi->ckpt);
409 kobject_put(&sbi->s_kobj);
410 wait_for_completion(&sbi->s_kobj_unregister);
411
412 sb->s_fs_info = NULL;
413 brelse(sbi->raw_super_buf);
414 kfree(sbi);
415 }
416
417 int f2fs_sync_fs(struct super_block *sb, int sync)
418 {
419 struct f2fs_sb_info *sbi = F2FS_SB(sb);
420
421 trace_f2fs_sync_fs(sb, sync);
422
423 if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
424 return 0;
425
426 if (sync) {
427 mutex_lock(&sbi->gc_mutex);
428 write_checkpoint(sbi, false);
429 mutex_unlock(&sbi->gc_mutex);
430 } else {
431 f2fs_balance_fs(sbi);
432 }
433
434 return 0;
435 }
436
437 static int f2fs_freeze(struct super_block *sb)
438 {
439 int err;
440
441 if (f2fs_readonly(sb))
442 return 0;
443
444 err = f2fs_sync_fs(sb, 1);
445 return err;
446 }
447
448 static int f2fs_unfreeze(struct super_block *sb)
449 {
450 return 0;
451 }
452
453 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
454 {
455 struct super_block *sb = dentry->d_sb;
456 struct f2fs_sb_info *sbi = F2FS_SB(sb);
457 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
458 block_t total_count, user_block_count, start_count, ovp_count;
459
460 total_count = le64_to_cpu(sbi->raw_super->block_count);
461 user_block_count = sbi->user_block_count;
462 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
463 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
464 buf->f_type = F2FS_SUPER_MAGIC;
465 buf->f_bsize = sbi->blocksize;
466
467 buf->f_blocks = total_count - start_count;
468 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
469 buf->f_bavail = user_block_count - valid_user_blocks(sbi);
470
471 buf->f_files = sbi->total_node_count;
472 buf->f_ffree = sbi->total_node_count - valid_inode_count(sbi);
473
474 buf->f_namelen = F2FS_NAME_LEN;
475 buf->f_fsid.val[0] = (u32)id;
476 buf->f_fsid.val[1] = (u32)(id >> 32);
477
478 return 0;
479 }
480
481 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
482 {
483 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
484
485 if (!(root->d_sb->s_flags & MS_RDONLY) && test_opt(sbi, BG_GC))
486 seq_printf(seq, ",background_gc=%s", "on");
487 else
488 seq_printf(seq, ",background_gc=%s", "off");
489 if (test_opt(sbi, DISABLE_ROLL_FORWARD))
490 seq_puts(seq, ",disable_roll_forward");
491 if (test_opt(sbi, DISCARD))
492 seq_puts(seq, ",discard");
493 if (test_opt(sbi, NOHEAP))
494 seq_puts(seq, ",no_heap_alloc");
495 #ifdef CONFIG_F2FS_FS_XATTR
496 if (test_opt(sbi, XATTR_USER))
497 seq_puts(seq, ",user_xattr");
498 else
499 seq_puts(seq, ",nouser_xattr");
500 if (test_opt(sbi, INLINE_XATTR))
501 seq_puts(seq, ",inline_xattr");
502 #endif
503 #ifdef CONFIG_F2FS_FS_POSIX_ACL
504 if (test_opt(sbi, POSIX_ACL))
505 seq_puts(seq, ",acl");
506 else
507 seq_puts(seq, ",noacl");
508 #endif
509 if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
510 seq_puts(seq, ",disable_ext_identify");
511
512 seq_printf(seq, ",active_logs=%u", sbi->active_logs);
513
514 return 0;
515 }
516
517 static int segment_info_seq_show(struct seq_file *seq, void *offset)
518 {
519 struct super_block *sb = seq->private;
520 struct f2fs_sb_info *sbi = F2FS_SB(sb);
521 unsigned int total_segs = le32_to_cpu(sbi->raw_super->segment_count_main);
522 int i;
523
524 for (i = 0; i < total_segs; i++) {
525 seq_printf(seq, "%u", get_valid_blocks(sbi, i, 1));
526 if (i != 0 && (i % 10) == 0)
527 seq_puts(seq, "\n");
528 else
529 seq_puts(seq, " ");
530 }
531 return 0;
532 }
533
534 static int segment_info_open_fs(struct inode *inode, struct file *file)
535 {
536 return single_open(file, segment_info_seq_show, PDE_DATA(inode));
537 }
538
539 static const struct file_operations f2fs_seq_segment_info_fops = {
540 .owner = THIS_MODULE,
541 .open = segment_info_open_fs,
542 .read = seq_read,
543 .llseek = seq_lseek,
544 .release = single_release,
545 };
546
547 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
548 {
549 struct f2fs_sb_info *sbi = F2FS_SB(sb);
550 struct f2fs_mount_info org_mount_opt;
551 int err, active_logs;
552
553 /*
554 * Save the old mount options in case we
555 * need to restore them.
556 */
557 org_mount_opt = sbi->mount_opt;
558 active_logs = sbi->active_logs;
559
560 /* parse mount options */
561 err = parse_options(sb, data);
562 if (err)
563 goto restore_opts;
564
565 /*
566 * Previous and new state of filesystem is RO,
567 * so no point in checking GC conditions.
568 */
569 if ((sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY))
570 goto skip;
571
572 /*
573 * We stop the GC thread if FS is mounted as RO
574 * or if background_gc = off is passed in mount
575 * option. Also sync the filesystem.
576 */
577 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
578 if (sbi->gc_thread) {
579 stop_gc_thread(sbi);
580 f2fs_sync_fs(sb, 1);
581 }
582 } else if (test_opt(sbi, BG_GC) && !sbi->gc_thread) {
583 err = start_gc_thread(sbi);
584 if (err)
585 goto restore_opts;
586 }
587 skip:
588 /* Update the POSIXACL Flag */
589 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
590 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
591 return 0;
592
593 restore_opts:
594 sbi->mount_opt = org_mount_opt;
595 sbi->active_logs = active_logs;
596 return err;
597 }
598
599 static struct super_operations f2fs_sops = {
600 .alloc_inode = f2fs_alloc_inode,
601 .drop_inode = f2fs_drop_inode,
602 .destroy_inode = f2fs_destroy_inode,
603 .write_inode = f2fs_write_inode,
604 .dirty_inode = f2fs_dirty_inode,
605 .show_options = f2fs_show_options,
606 .evict_inode = f2fs_evict_inode,
607 .put_super = f2fs_put_super,
608 .sync_fs = f2fs_sync_fs,
609 .freeze_fs = f2fs_freeze,
610 .unfreeze_fs = f2fs_unfreeze,
611 .statfs = f2fs_statfs,
612 .remount_fs = f2fs_remount,
613 };
614
615 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
616 u64 ino, u32 generation)
617 {
618 struct f2fs_sb_info *sbi = F2FS_SB(sb);
619 struct inode *inode;
620
621 if (ino < F2FS_ROOT_INO(sbi))
622 return ERR_PTR(-ESTALE);
623
624 /*
625 * f2fs_iget isn't quite right if the inode is currently unallocated!
626 * However f2fs_iget currently does appropriate checks to handle stale
627 * inodes so everything is OK.
628 */
629 inode = f2fs_iget(sb, ino);
630 if (IS_ERR(inode))
631 return ERR_CAST(inode);
632 if (generation && inode->i_generation != generation) {
633 /* we didn't find the right inode.. */
634 iput(inode);
635 return ERR_PTR(-ESTALE);
636 }
637 return inode;
638 }
639
640 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
641 int fh_len, int fh_type)
642 {
643 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
644 f2fs_nfs_get_inode);
645 }
646
647 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
648 int fh_len, int fh_type)
649 {
650 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
651 f2fs_nfs_get_inode);
652 }
653
654 static const struct export_operations f2fs_export_ops = {
655 .fh_to_dentry = f2fs_fh_to_dentry,
656 .fh_to_parent = f2fs_fh_to_parent,
657 .get_parent = f2fs_get_parent,
658 };
659
660 static loff_t max_file_size(unsigned bits)
661 {
662 loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
663 loff_t leaf_count = ADDRS_PER_BLOCK;
664
665 /* two direct node blocks */
666 result += (leaf_count * 2);
667
668 /* two indirect node blocks */
669 leaf_count *= NIDS_PER_BLOCK;
670 result += (leaf_count * 2);
671
672 /* one double indirect node block */
673 leaf_count *= NIDS_PER_BLOCK;
674 result += leaf_count;
675
676 result <<= bits;
677 return result;
678 }
679
680 static int sanity_check_raw_super(struct super_block *sb,
681 struct f2fs_super_block *raw_super)
682 {
683 unsigned int blocksize;
684
685 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
686 f2fs_msg(sb, KERN_INFO,
687 "Magic Mismatch, valid(0x%x) - read(0x%x)",
688 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
689 return 1;
690 }
691
692 /* Currently, support only 4KB page cache size */
693 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
694 f2fs_msg(sb, KERN_INFO,
695 "Invalid page_cache_size (%lu), supports only 4KB\n",
696 PAGE_CACHE_SIZE);
697 return 1;
698 }
699
700 /* Currently, support only 4KB block size */
701 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
702 if (blocksize != F2FS_BLKSIZE) {
703 f2fs_msg(sb, KERN_INFO,
704 "Invalid blocksize (%u), supports only 4KB\n",
705 blocksize);
706 return 1;
707 }
708
709 if (le32_to_cpu(raw_super->log_sectorsize) !=
710 F2FS_LOG_SECTOR_SIZE) {
711 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize");
712 return 1;
713 }
714 if (le32_to_cpu(raw_super->log_sectors_per_block) !=
715 F2FS_LOG_SECTORS_PER_BLOCK) {
716 f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block");
717 return 1;
718 }
719 return 0;
720 }
721
722 static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
723 {
724 unsigned int total, fsmeta;
725 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
726 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
727
728 total = le32_to_cpu(raw_super->segment_count);
729 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
730 fsmeta += le32_to_cpu(raw_super->segment_count_sit);
731 fsmeta += le32_to_cpu(raw_super->segment_count_nat);
732 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
733 fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
734
735 if (fsmeta >= total)
736 return 1;
737
738 if (is_set_ckpt_flags(ckpt, CP_ERROR_FLAG)) {
739 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
740 return 1;
741 }
742 return 0;
743 }
744
745 static void init_sb_info(struct f2fs_sb_info *sbi)
746 {
747 struct f2fs_super_block *raw_super = sbi->raw_super;
748 int i;
749
750 sbi->log_sectors_per_block =
751 le32_to_cpu(raw_super->log_sectors_per_block);
752 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
753 sbi->blocksize = 1 << sbi->log_blocksize;
754 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
755 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
756 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
757 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
758 sbi->total_sections = le32_to_cpu(raw_super->section_count);
759 sbi->total_node_count =
760 (le32_to_cpu(raw_super->segment_count_nat) / 2)
761 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
762 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
763 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
764 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
765 sbi->cur_victim_sec = NULL_SECNO;
766
767 for (i = 0; i < NR_COUNT_TYPE; i++)
768 atomic_set(&sbi->nr_pages[i], 0);
769 }
770
771 /*
772 * Read f2fs raw super block.
773 * Because we have two copies of super block, so read the first one at first,
774 * if the first one is invalid, move to read the second one.
775 */
776 static int read_raw_super_block(struct super_block *sb,
777 struct f2fs_super_block **raw_super,
778 struct buffer_head **raw_super_buf)
779 {
780 int block = 0;
781
782 retry:
783 *raw_super_buf = sb_bread(sb, block);
784 if (!*raw_super_buf) {
785 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
786 block + 1);
787 if (block == 0) {
788 block++;
789 goto retry;
790 } else {
791 return -EIO;
792 }
793 }
794
795 *raw_super = (struct f2fs_super_block *)
796 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
797
798 /* sanity checking of raw super */
799 if (sanity_check_raw_super(sb, *raw_super)) {
800 brelse(*raw_super_buf);
801 f2fs_msg(sb, KERN_ERR, "Can't find a valid F2FS filesystem "
802 "in %dth superblock", block + 1);
803 if(block == 0) {
804 block++;
805 goto retry;
806 } else {
807 return -EINVAL;
808 }
809 }
810
811 return 0;
812 }
813
814 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
815 {
816 struct f2fs_sb_info *sbi;
817 struct f2fs_super_block *raw_super;
818 struct buffer_head *raw_super_buf;
819 struct inode *root;
820 long err = -EINVAL;
821
822 /* allocate memory for f2fs-specific super block info */
823 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
824 if (!sbi)
825 return -ENOMEM;
826
827 /* set a block size */
828 if (!sb_set_blocksize(sb, F2FS_BLKSIZE)) {
829 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
830 goto free_sbi;
831 }
832
833 err = read_raw_super_block(sb, &raw_super, &raw_super_buf);
834 if (err)
835 goto free_sbi;
836
837 sb->s_fs_info = sbi;
838 /* init some FS parameters */
839 sbi->active_logs = NR_CURSEG_TYPE;
840
841 set_opt(sbi, BG_GC);
842
843 #ifdef CONFIG_F2FS_FS_XATTR
844 set_opt(sbi, XATTR_USER);
845 #endif
846 #ifdef CONFIG_F2FS_FS_POSIX_ACL
847 set_opt(sbi, POSIX_ACL);
848 #endif
849 /* parse mount options */
850 err = parse_options(sb, (char *)data);
851 if (err)
852 goto free_sb_buf;
853
854 sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
855 sb->s_max_links = F2FS_LINK_MAX;
856 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
857
858 sb->s_op = &f2fs_sops;
859 sb->s_xattr = f2fs_xattr_handlers;
860 sb->s_export_op = &f2fs_export_ops;
861 sb->s_magic = F2FS_SUPER_MAGIC;
862 sb->s_time_gran = 1;
863 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
864 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
865 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
866
867 /* init f2fs-specific super block info */
868 sbi->sb = sb;
869 sbi->raw_super = raw_super;
870 sbi->raw_super_buf = raw_super_buf;
871 mutex_init(&sbi->gc_mutex);
872 mutex_init(&sbi->writepages);
873 mutex_init(&sbi->cp_mutex);
874 mutex_init(&sbi->node_write);
875 sbi->por_doing = false;
876 spin_lock_init(&sbi->stat_lock);
877 init_rwsem(&sbi->bio_sem);
878 init_rwsem(&sbi->cp_rwsem);
879 init_waitqueue_head(&sbi->cp_wait);
880 init_sb_info(sbi);
881
882 /* get an inode for meta space */
883 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
884 if (IS_ERR(sbi->meta_inode)) {
885 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
886 err = PTR_ERR(sbi->meta_inode);
887 goto free_sb_buf;
888 }
889
890 err = get_valid_checkpoint(sbi);
891 if (err) {
892 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
893 goto free_meta_inode;
894 }
895
896 /* sanity checking of checkpoint */
897 err = -EINVAL;
898 if (sanity_check_ckpt(sbi)) {
899 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
900 goto free_cp;
901 }
902
903 sbi->total_valid_node_count =
904 le32_to_cpu(sbi->ckpt->valid_node_count);
905 sbi->total_valid_inode_count =
906 le32_to_cpu(sbi->ckpt->valid_inode_count);
907 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
908 sbi->total_valid_block_count =
909 le64_to_cpu(sbi->ckpt->valid_block_count);
910 sbi->last_valid_block_count = sbi->total_valid_block_count;
911 sbi->alloc_valid_block_count = 0;
912 INIT_LIST_HEAD(&sbi->dir_inode_list);
913 spin_lock_init(&sbi->dir_inode_lock);
914
915 init_orphan_info(sbi);
916
917 /* setup f2fs internal modules */
918 err = build_segment_manager(sbi);
919 if (err) {
920 f2fs_msg(sb, KERN_ERR,
921 "Failed to initialize F2FS segment manager");
922 goto free_sm;
923 }
924 err = build_node_manager(sbi);
925 if (err) {
926 f2fs_msg(sb, KERN_ERR,
927 "Failed to initialize F2FS node manager");
928 goto free_nm;
929 }
930
931 build_gc_manager(sbi);
932
933 /* get an inode for node space */
934 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
935 if (IS_ERR(sbi->node_inode)) {
936 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
937 err = PTR_ERR(sbi->node_inode);
938 goto free_nm;
939 }
940
941 /* if there are nt orphan nodes free them */
942 err = -EINVAL;
943 if (recover_orphan_inodes(sbi))
944 goto free_node_inode;
945
946 /* read root inode and dentry */
947 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
948 if (IS_ERR(root)) {
949 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
950 err = PTR_ERR(root);
951 goto free_node_inode;
952 }
953 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size)
954 goto free_root_inode;
955
956 sb->s_root = d_make_root(root); /* allocate root dentry */
957 if (!sb->s_root) {
958 err = -ENOMEM;
959 goto free_root_inode;
960 }
961
962 /* recover fsynced data */
963 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
964 err = recover_fsync_data(sbi);
965 if (err)
966 f2fs_msg(sb, KERN_ERR,
967 "Cannot recover all fsync data errno=%ld", err);
968 }
969
970 /*
971 * If filesystem is not mounted as read-only then
972 * do start the gc_thread.
973 */
974 if (!(sb->s_flags & MS_RDONLY)) {
975 /* After POR, we can run background GC thread.*/
976 err = start_gc_thread(sbi);
977 if (err)
978 goto free_gc;
979 }
980
981 err = f2fs_build_stats(sbi);
982 if (err)
983 goto free_gc;
984
985 if (f2fs_proc_root)
986 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
987
988 if (sbi->s_proc)
989 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
990 &f2fs_seq_segment_info_fops, sb);
991
992 if (test_opt(sbi, DISCARD)) {
993 struct request_queue *q = bdev_get_queue(sb->s_bdev);
994 if (!blk_queue_discard(q))
995 f2fs_msg(sb, KERN_WARNING,
996 "mounting with \"discard\" option, but "
997 "the device does not support discard");
998 }
999
1000 sbi->s_kobj.kset = f2fs_kset;
1001 init_completion(&sbi->s_kobj_unregister);
1002 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1003 "%s", sb->s_id);
1004 if (err)
1005 goto fail;
1006
1007 return 0;
1008 fail:
1009 if (sbi->s_proc) {
1010 remove_proc_entry("segment_info", sbi->s_proc);
1011 remove_proc_entry(sb->s_id, f2fs_proc_root);
1012 }
1013 f2fs_destroy_stats(sbi);
1014 free_gc:
1015 stop_gc_thread(sbi);
1016 free_root_inode:
1017 dput(sb->s_root);
1018 sb->s_root = NULL;
1019 free_node_inode:
1020 iput(sbi->node_inode);
1021 free_nm:
1022 destroy_node_manager(sbi);
1023 free_sm:
1024 destroy_segment_manager(sbi);
1025 free_cp:
1026 kfree(sbi->ckpt);
1027 free_meta_inode:
1028 make_bad_inode(sbi->meta_inode);
1029 iput(sbi->meta_inode);
1030 free_sb_buf:
1031 brelse(raw_super_buf);
1032 free_sbi:
1033 kfree(sbi);
1034 return err;
1035 }
1036
1037 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1038 const char *dev_name, void *data)
1039 {
1040 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1041 }
1042
1043 static struct file_system_type f2fs_fs_type = {
1044 .owner = THIS_MODULE,
1045 .name = "f2fs",
1046 .mount = f2fs_mount,
1047 .kill_sb = kill_block_super,
1048 .fs_flags = FS_REQUIRES_DEV,
1049 };
1050 MODULE_ALIAS_FS("f2fs");
1051
1052 static int __init init_inodecache(void)
1053 {
1054 f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
1055 sizeof(struct f2fs_inode_info), NULL);
1056 if (f2fs_inode_cachep == NULL)
1057 return -ENOMEM;
1058 return 0;
1059 }
1060
1061 static void destroy_inodecache(void)
1062 {
1063 /*
1064 * Make sure all delayed rcu free inodes are flushed before we
1065 * destroy cache.
1066 */
1067 rcu_barrier();
1068 kmem_cache_destroy(f2fs_inode_cachep);
1069 }
1070
1071 static int __init init_f2fs_fs(void)
1072 {
1073 int err;
1074
1075 err = init_inodecache();
1076 if (err)
1077 goto fail;
1078 err = create_node_manager_caches();
1079 if (err)
1080 goto free_inodecache;
1081 err = create_gc_caches();
1082 if (err)
1083 goto free_node_manager_caches;
1084 err = create_checkpoint_caches();
1085 if (err)
1086 goto free_gc_caches;
1087 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1088 if (!f2fs_kset) {
1089 err = -ENOMEM;
1090 goto free_checkpoint_caches;
1091 }
1092 err = register_filesystem(&f2fs_fs_type);
1093 if (err)
1094 goto free_kset;
1095 f2fs_create_root_stats();
1096 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1097 return 0;
1098
1099 free_kset:
1100 kset_unregister(f2fs_kset);
1101 free_checkpoint_caches:
1102 destroy_checkpoint_caches();
1103 free_gc_caches:
1104 destroy_gc_caches();
1105 free_node_manager_caches:
1106 destroy_node_manager_caches();
1107 free_inodecache:
1108 destroy_inodecache();
1109 fail:
1110 return err;
1111 }
1112
1113 static void __exit exit_f2fs_fs(void)
1114 {
1115 remove_proc_entry("fs/f2fs", NULL);
1116 f2fs_destroy_root_stats();
1117 unregister_filesystem(&f2fs_fs_type);
1118 destroy_checkpoint_caches();
1119 destroy_gc_caches();
1120 destroy_node_manager_caches();
1121 destroy_inodecache();
1122 kset_unregister(f2fs_kset);
1123 }
1124
1125 module_init(init_f2fs_fs)
1126 module_exit(exit_f2fs_fs)
1127
1128 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1129 MODULE_DESCRIPTION("Flash Friendly File System");
1130 MODULE_LICENSE("GPL");
Linus' kernel tree