4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
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.
11 #include <linux/module.h>
12 #include <linux/init.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/kobject.h>
27 #include <linux/sysfs.h>
35 #define CREATE_TRACE_POINTS
36 #include <trace/events/f2fs.h>
38 static struct proc_dir_entry *f2fs_proc_root;
39 static struct kmem_cache *f2fs_inode_cachep;
40 static struct kset *f2fs_kset;
44 Opt_disable_roll_forward,
50 Opt_disable_ext_identify,
54 static match_table_t f2fs_tokens = {
55 {Opt_gc_background, "background_gc=%s"},
56 {Opt_disable_roll_forward, "disable_roll_forward"},
57 {Opt_discard, "discard"},
58 {Opt_noheap, "no_heap"},
59 {Opt_nouser_xattr, "nouser_xattr"},
61 {Opt_active_logs, "active_logs=%u"},
62 {Opt_disable_ext_identify, "disable_ext_identify"},
66 /* Sysfs support for f2fs */
68 struct attribute attr;
69 ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
70 ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
71 const char *, size_t);
75 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
76 struct f2fs_sb_info *sbi, char *buf)
78 struct f2fs_gc_kthread *gc_kth = sbi->gc_thread;
84 ui = (unsigned int *)(((char *)gc_kth) + a->offset);
86 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
89 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
90 struct f2fs_sb_info *sbi,
91 const char *buf, size_t count)
93 struct f2fs_gc_kthread *gc_kth = sbi->gc_thread;
101 ui = (unsigned int *)(((char *)gc_kth) + a->offset);
103 ret = kstrtoul(skip_spaces(buf), 0, &t);
110 static ssize_t f2fs_attr_show(struct kobject *kobj,
111 struct attribute *attr, char *buf)
113 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
115 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
117 return a->show ? a->show(a, sbi, buf) : 0;
120 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
121 const char *buf, size_t len)
123 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
125 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
127 return a->store ? a->store(a, sbi, buf, len) : 0;
130 static void f2fs_sb_release(struct kobject *kobj)
132 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
134 complete(&sbi->s_kobj_unregister);
137 #define F2FS_ATTR_OFFSET(_name, _mode, _show, _store, _elname) \
138 static struct f2fs_attr f2fs_attr_##_name = { \
139 .attr = {.name = __stringify(_name), .mode = _mode }, \
142 .offset = offsetof(struct f2fs_gc_kthread, _elname), \
145 #define F2FS_RW_ATTR(name, elname) \
146 F2FS_ATTR_OFFSET(name, 0644, f2fs_sbi_show, f2fs_sbi_store, elname)
148 F2FS_RW_ATTR(gc_min_sleep_time, min_sleep_time);
149 F2FS_RW_ATTR(gc_max_sleep_time, max_sleep_time);
150 F2FS_RW_ATTR(gc_no_gc_sleep_time, no_gc_sleep_time);
152 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
153 static struct attribute *f2fs_attrs[] = {
154 ATTR_LIST(gc_min_sleep_time),
155 ATTR_LIST(gc_max_sleep_time),
156 ATTR_LIST(gc_no_gc_sleep_time),
160 static const struct sysfs_ops f2fs_attr_ops = {
161 .show = f2fs_attr_show,
162 .store = f2fs_attr_store,
165 static struct kobj_type f2fs_ktype = {
166 .default_attrs = f2fs_attrs,
167 .sysfs_ops = &f2fs_attr_ops,
168 .release = f2fs_sb_release,
171 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
173 struct va_format vaf;
179 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
183 static void init_once(void *foo)
185 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
187 inode_init_once(&fi->vfs_inode);
190 static int parse_options(struct super_block *sb, char *options)
192 struct f2fs_sb_info *sbi = F2FS_SB(sb);
193 substring_t args[MAX_OPT_ARGS];
200 while ((p = strsep(&options, ",")) != NULL) {
205 * Initialize args struct so we know whether arg was
206 * found; some options take optional arguments.
208 args[0].to = args[0].from = NULL;
209 token = match_token(p, f2fs_tokens, args);
212 case Opt_gc_background:
213 name = match_strdup(&args[0]);
217 if (!strncmp(name, "on", 2))
219 else if (!strncmp(name, "off", 3))
220 clear_opt(sbi, BG_GC);
227 case Opt_disable_roll_forward:
228 set_opt(sbi, DISABLE_ROLL_FORWARD);
231 set_opt(sbi, DISCARD);
234 set_opt(sbi, NOHEAP);
236 #ifdef CONFIG_F2FS_FS_XATTR
237 case Opt_nouser_xattr:
238 clear_opt(sbi, XATTR_USER);
241 case Opt_nouser_xattr:
242 f2fs_msg(sb, KERN_INFO,
243 "nouser_xattr options not supported");
246 #ifdef CONFIG_F2FS_FS_POSIX_ACL
248 clear_opt(sbi, POSIX_ACL);
252 f2fs_msg(sb, KERN_INFO, "noacl options not supported");
255 case Opt_active_logs:
256 if (args->from && match_int(args, &arg))
258 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
260 sbi->active_logs = arg;
262 case Opt_disable_ext_identify:
263 set_opt(sbi, DISABLE_EXT_IDENTIFY);
266 f2fs_msg(sb, KERN_ERR,
267 "Unrecognized mount option \"%s\" or missing value",
275 static struct inode *f2fs_alloc_inode(struct super_block *sb)
277 struct f2fs_inode_info *fi;
279 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_NOFS | __GFP_ZERO);
283 init_once((void *) fi);
285 /* Initialize f2fs-specific inode info */
286 fi->vfs_inode.i_version = 1;
287 atomic_set(&fi->dirty_dents, 0);
288 fi->i_current_depth = 1;
290 rwlock_init(&fi->ext.ext_lock);
292 set_inode_flag(fi, FI_NEW_INODE);
294 return &fi->vfs_inode;
297 static int f2fs_drop_inode(struct inode *inode)
300 * This is to avoid a deadlock condition like below.
301 * writeback_single_inode(inode)
302 * - f2fs_write_data_page
303 * - f2fs_gc -> iput -> evict
304 * - inode_wait_for_writeback(inode)
306 if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
308 return generic_drop_inode(inode);
312 * f2fs_dirty_inode() is called from __mark_inode_dirty()
314 * We should call set_dirty_inode to write the dirty inode through write_inode.
316 static void f2fs_dirty_inode(struct inode *inode, int flags)
318 set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
322 static void f2fs_i_callback(struct rcu_head *head)
324 struct inode *inode = container_of(head, struct inode, i_rcu);
325 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
328 static void f2fs_destroy_inode(struct inode *inode)
330 call_rcu(&inode->i_rcu, f2fs_i_callback);
333 static void f2fs_put_super(struct super_block *sb)
335 struct f2fs_sb_info *sbi = F2FS_SB(sb);
338 remove_proc_entry("segment_info", sbi->s_proc);
339 remove_proc_entry(sb->s_id, f2fs_proc_root);
341 kobject_del(&sbi->s_kobj);
343 f2fs_destroy_stats(sbi);
346 write_checkpoint(sbi, true);
348 iput(sbi->node_inode);
349 iput(sbi->meta_inode);
351 /* destroy f2fs internal modules */
352 destroy_node_manager(sbi);
353 destroy_segment_manager(sbi);
356 kobject_put(&sbi->s_kobj);
357 wait_for_completion(&sbi->s_kobj_unregister);
359 sb->s_fs_info = NULL;
360 brelse(sbi->raw_super_buf);
364 int f2fs_sync_fs(struct super_block *sb, int sync)
366 struct f2fs_sb_info *sbi = F2FS_SB(sb);
368 trace_f2fs_sync_fs(sb, sync);
370 if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
374 mutex_lock(&sbi->gc_mutex);
375 write_checkpoint(sbi, false);
376 mutex_unlock(&sbi->gc_mutex);
378 f2fs_balance_fs(sbi);
384 static int f2fs_freeze(struct super_block *sb)
388 if (f2fs_readonly(sb))
391 err = f2fs_sync_fs(sb, 1);
395 static int f2fs_unfreeze(struct super_block *sb)
400 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
402 struct super_block *sb = dentry->d_sb;
403 struct f2fs_sb_info *sbi = F2FS_SB(sb);
404 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
405 block_t total_count, user_block_count, start_count, ovp_count;
407 total_count = le64_to_cpu(sbi->raw_super->block_count);
408 user_block_count = sbi->user_block_count;
409 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
410 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
411 buf->f_type = F2FS_SUPER_MAGIC;
412 buf->f_bsize = sbi->blocksize;
414 buf->f_blocks = total_count - start_count;
415 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
416 buf->f_bavail = user_block_count - valid_user_blocks(sbi);
418 buf->f_files = sbi->total_node_count;
419 buf->f_ffree = sbi->total_node_count - valid_inode_count(sbi);
421 buf->f_namelen = F2FS_NAME_LEN;
422 buf->f_fsid.val[0] = (u32)id;
423 buf->f_fsid.val[1] = (u32)(id >> 32);
428 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
430 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
432 if (!(root->d_sb->s_flags & MS_RDONLY) && test_opt(sbi, BG_GC))
433 seq_printf(seq, ",background_gc=%s", "on");
435 seq_printf(seq, ",background_gc=%s", "off");
436 if (test_opt(sbi, DISABLE_ROLL_FORWARD))
437 seq_puts(seq, ",disable_roll_forward");
438 if (test_opt(sbi, DISCARD))
439 seq_puts(seq, ",discard");
440 if (test_opt(sbi, NOHEAP))
441 seq_puts(seq, ",no_heap_alloc");
442 #ifdef CONFIG_F2FS_FS_XATTR
443 if (test_opt(sbi, XATTR_USER))
444 seq_puts(seq, ",user_xattr");
446 seq_puts(seq, ",nouser_xattr");
448 #ifdef CONFIG_F2FS_FS_POSIX_ACL
449 if (test_opt(sbi, POSIX_ACL))
450 seq_puts(seq, ",acl");
452 seq_puts(seq, ",noacl");
454 if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
455 seq_puts(seq, ",disable_ext_identify");
457 seq_printf(seq, ",active_logs=%u", sbi->active_logs);
462 static int segment_info_seq_show(struct seq_file *seq, void *offset)
464 struct super_block *sb = seq->private;
465 struct f2fs_sb_info *sbi = F2FS_SB(sb);
466 unsigned int total_segs = le32_to_cpu(sbi->raw_super->segment_count_main);
469 for (i = 0; i < total_segs; i++) {
470 seq_printf(seq, "%u", get_valid_blocks(sbi, i, 1));
471 if (i != 0 && (i % 10) == 0)
479 static int segment_info_open_fs(struct inode *inode, struct file *file)
481 return single_open(file, segment_info_seq_show, PDE_DATA(inode));
484 static const struct file_operations f2fs_seq_segment_info_fops = {
485 .owner = THIS_MODULE,
486 .open = segment_info_open_fs,
489 .release = single_release,
492 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
494 struct f2fs_sb_info *sbi = F2FS_SB(sb);
495 struct f2fs_mount_info org_mount_opt;
496 int err, active_logs;
499 * Save the old mount options in case we
500 * need to restore them.
502 org_mount_opt = sbi->mount_opt;
503 active_logs = sbi->active_logs;
505 /* parse mount options */
506 err = parse_options(sb, data);
511 * Previous and new state of filesystem is RO,
512 * so no point in checking GC conditions.
514 if ((sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY))
518 * We stop the GC thread if FS is mounted as RO
519 * or if background_gc = off is passed in mount
520 * option. Also sync the filesystem.
522 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
523 if (sbi->gc_thread) {
527 } else if (test_opt(sbi, BG_GC) && !sbi->gc_thread) {
528 err = start_gc_thread(sbi);
533 /* Update the POSIXACL Flag */
534 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
535 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
539 sbi->mount_opt = org_mount_opt;
540 sbi->active_logs = active_logs;
544 static struct super_operations f2fs_sops = {
545 .alloc_inode = f2fs_alloc_inode,
546 .drop_inode = f2fs_drop_inode,
547 .destroy_inode = f2fs_destroy_inode,
548 .write_inode = f2fs_write_inode,
549 .dirty_inode = f2fs_dirty_inode,
550 .show_options = f2fs_show_options,
551 .evict_inode = f2fs_evict_inode,
552 .put_super = f2fs_put_super,
553 .sync_fs = f2fs_sync_fs,
554 .freeze_fs = f2fs_freeze,
555 .unfreeze_fs = f2fs_unfreeze,
556 .statfs = f2fs_statfs,
557 .remount_fs = f2fs_remount,
560 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
561 u64 ino, u32 generation)
563 struct f2fs_sb_info *sbi = F2FS_SB(sb);
566 if (ino < F2FS_ROOT_INO(sbi))
567 return ERR_PTR(-ESTALE);
570 * f2fs_iget isn't quite right if the inode is currently unallocated!
571 * However f2fs_iget currently does appropriate checks to handle stale
572 * inodes so everything is OK.
574 inode = f2fs_iget(sb, ino);
576 return ERR_CAST(inode);
577 if (generation && inode->i_generation != generation) {
578 /* we didn't find the right inode.. */
580 return ERR_PTR(-ESTALE);
585 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
586 int fh_len, int fh_type)
588 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
592 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
593 int fh_len, int fh_type)
595 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
599 static const struct export_operations f2fs_export_ops = {
600 .fh_to_dentry = f2fs_fh_to_dentry,
601 .fh_to_parent = f2fs_fh_to_parent,
602 .get_parent = f2fs_get_parent,
605 static loff_t max_file_size(unsigned bits)
607 loff_t result = ADDRS_PER_INODE;
608 loff_t leaf_count = ADDRS_PER_BLOCK;
610 /* two direct node blocks */
611 result += (leaf_count * 2);
613 /* two indirect node blocks */
614 leaf_count *= NIDS_PER_BLOCK;
615 result += (leaf_count * 2);
617 /* one double indirect node block */
618 leaf_count *= NIDS_PER_BLOCK;
619 result += leaf_count;
625 static int sanity_check_raw_super(struct super_block *sb,
626 struct f2fs_super_block *raw_super)
628 unsigned int blocksize;
630 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
631 f2fs_msg(sb, KERN_INFO,
632 "Magic Mismatch, valid(0x%x) - read(0x%x)",
633 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
637 /* Currently, support only 4KB page cache size */
638 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
639 f2fs_msg(sb, KERN_INFO,
640 "Invalid page_cache_size (%lu), supports only 4KB\n",
645 /* Currently, support only 4KB block size */
646 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
647 if (blocksize != F2FS_BLKSIZE) {
648 f2fs_msg(sb, KERN_INFO,
649 "Invalid blocksize (%u), supports only 4KB\n",
654 if (le32_to_cpu(raw_super->log_sectorsize) !=
655 F2FS_LOG_SECTOR_SIZE) {
656 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize");
659 if (le32_to_cpu(raw_super->log_sectors_per_block) !=
660 F2FS_LOG_SECTORS_PER_BLOCK) {
661 f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block");
667 static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
669 unsigned int total, fsmeta;
670 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
671 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
673 total = le32_to_cpu(raw_super->segment_count);
674 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
675 fsmeta += le32_to_cpu(raw_super->segment_count_sit);
676 fsmeta += le32_to_cpu(raw_super->segment_count_nat);
677 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
678 fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
683 if (is_set_ckpt_flags(ckpt, CP_ERROR_FLAG)) {
684 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
690 static void init_sb_info(struct f2fs_sb_info *sbi)
692 struct f2fs_super_block *raw_super = sbi->raw_super;
695 sbi->log_sectors_per_block =
696 le32_to_cpu(raw_super->log_sectors_per_block);
697 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
698 sbi->blocksize = 1 << sbi->log_blocksize;
699 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
700 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
701 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
702 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
703 sbi->total_sections = le32_to_cpu(raw_super->section_count);
704 sbi->total_node_count =
705 (le32_to_cpu(raw_super->segment_count_nat) / 2)
706 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
707 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
708 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
709 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
710 sbi->cur_victim_sec = NULL_SECNO;
712 for (i = 0; i < NR_COUNT_TYPE; i++)
713 atomic_set(&sbi->nr_pages[i], 0);
716 static int validate_superblock(struct super_block *sb,
717 struct f2fs_super_block **raw_super,
718 struct buffer_head **raw_super_buf, sector_t block)
720 const char *super = (block == 0 ? "first" : "second");
722 /* read f2fs raw super block */
723 *raw_super_buf = sb_bread(sb, block);
724 if (!*raw_super_buf) {
725 f2fs_msg(sb, KERN_ERR, "unable to read %s superblock",
730 *raw_super = (struct f2fs_super_block *)
731 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
733 /* sanity checking of raw super */
734 if (!sanity_check_raw_super(sb, *raw_super))
737 f2fs_msg(sb, KERN_ERR, "Can't find a valid F2FS filesystem "
738 "in %s superblock", super);
742 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
744 struct f2fs_sb_info *sbi;
745 struct f2fs_super_block *raw_super;
746 struct buffer_head *raw_super_buf;
751 /* allocate memory for f2fs-specific super block info */
752 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
756 /* set a block size */
757 if (!sb_set_blocksize(sb, F2FS_BLKSIZE)) {
758 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
762 err = validate_superblock(sb, &raw_super, &raw_super_buf, 0);
764 brelse(raw_super_buf);
765 /* check secondary superblock when primary failed */
766 err = validate_superblock(sb, &raw_super, &raw_super_buf, 1);
771 /* init some FS parameters */
772 sbi->active_logs = NR_CURSEG_TYPE;
776 #ifdef CONFIG_F2FS_FS_XATTR
777 set_opt(sbi, XATTR_USER);
779 #ifdef CONFIG_F2FS_FS_POSIX_ACL
780 set_opt(sbi, POSIX_ACL);
782 /* parse mount options */
783 err = parse_options(sb, (char *)data);
787 sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
788 sb->s_max_links = F2FS_LINK_MAX;
789 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
791 sb->s_op = &f2fs_sops;
792 sb->s_xattr = f2fs_xattr_handlers;
793 sb->s_export_op = &f2fs_export_ops;
794 sb->s_magic = F2FS_SUPER_MAGIC;
796 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
797 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
798 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
800 /* init f2fs-specific super block info */
802 sbi->raw_super = raw_super;
803 sbi->raw_super_buf = raw_super_buf;
804 mutex_init(&sbi->gc_mutex);
805 mutex_init(&sbi->writepages);
806 mutex_init(&sbi->cp_mutex);
807 for (i = 0; i < NR_GLOBAL_LOCKS; i++)
808 mutex_init(&sbi->fs_lock[i]);
809 mutex_init(&sbi->node_write);
811 spin_lock_init(&sbi->stat_lock);
812 init_rwsem(&sbi->bio_sem);
815 /* get an inode for meta space */
816 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
817 if (IS_ERR(sbi->meta_inode)) {
818 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
819 err = PTR_ERR(sbi->meta_inode);
823 err = get_valid_checkpoint(sbi);
825 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
826 goto free_meta_inode;
829 /* sanity checking of checkpoint */
831 if (sanity_check_ckpt(sbi)) {
832 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
836 sbi->total_valid_node_count =
837 le32_to_cpu(sbi->ckpt->valid_node_count);
838 sbi->total_valid_inode_count =
839 le32_to_cpu(sbi->ckpt->valid_inode_count);
840 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
841 sbi->total_valid_block_count =
842 le64_to_cpu(sbi->ckpt->valid_block_count);
843 sbi->last_valid_block_count = sbi->total_valid_block_count;
844 sbi->alloc_valid_block_count = 0;
845 INIT_LIST_HEAD(&sbi->dir_inode_list);
846 spin_lock_init(&sbi->dir_inode_lock);
848 init_orphan_info(sbi);
850 /* setup f2fs internal modules */
851 err = build_segment_manager(sbi);
853 f2fs_msg(sb, KERN_ERR,
854 "Failed to initialize F2FS segment manager");
857 err = build_node_manager(sbi);
859 f2fs_msg(sb, KERN_ERR,
860 "Failed to initialize F2FS node manager");
864 build_gc_manager(sbi);
866 /* get an inode for node space */
867 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
868 if (IS_ERR(sbi->node_inode)) {
869 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
870 err = PTR_ERR(sbi->node_inode);
874 /* if there are nt orphan nodes free them */
876 if (recover_orphan_inodes(sbi))
877 goto free_node_inode;
879 /* read root inode and dentry */
880 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
882 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
884 goto free_node_inode;
886 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size)
887 goto free_root_inode;
889 sb->s_root = d_make_root(root); /* allocate root dentry */
892 goto free_root_inode;
895 /* recover fsynced data */
896 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
897 err = recover_fsync_data(sbi);
899 f2fs_msg(sb, KERN_ERR,
900 "Cannot recover all fsync data errno=%ld", err);
904 * If filesystem is not mounted as read-only then
905 * do start the gc_thread.
907 if (!(sb->s_flags & MS_RDONLY)) {
908 /* After POR, we can run background GC thread.*/
909 err = start_gc_thread(sbi);
914 err = f2fs_build_stats(sbi);
919 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
922 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
923 &f2fs_seq_segment_info_fops, sb);
925 if (test_opt(sbi, DISCARD)) {
926 struct request_queue *q = bdev_get_queue(sb->s_bdev);
927 if (!blk_queue_discard(q))
928 f2fs_msg(sb, KERN_WARNING,
929 "mounting with \"discard\" option, but "
930 "the device does not support discard");
933 sbi->s_kobj.kset = f2fs_kset;
934 init_completion(&sbi->s_kobj_unregister);
935 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
947 iput(sbi->node_inode);
949 destroy_node_manager(sbi);
951 destroy_segment_manager(sbi);
955 make_bad_inode(sbi->meta_inode);
956 iput(sbi->meta_inode);
958 brelse(raw_super_buf);
964 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
965 const char *dev_name, void *data)
967 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
970 static struct file_system_type f2fs_fs_type = {
971 .owner = THIS_MODULE,
974 .kill_sb = kill_block_super,
975 .fs_flags = FS_REQUIRES_DEV,
977 MODULE_ALIAS_FS("f2fs");
979 static int __init init_inodecache(void)
981 f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
982 sizeof(struct f2fs_inode_info), NULL);
983 if (f2fs_inode_cachep == NULL)
988 static void destroy_inodecache(void)
991 * Make sure all delayed rcu free inodes are flushed before we
995 kmem_cache_destroy(f2fs_inode_cachep);
998 static int __init init_f2fs_fs(void)
1002 err = init_inodecache();
1005 err = create_node_manager_caches();
1008 err = create_gc_caches();
1011 err = create_checkpoint_caches();
1014 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1017 err = register_filesystem(&f2fs_fs_type);
1020 f2fs_create_root_stats();
1021 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1026 static void __exit exit_f2fs_fs(void)
1028 remove_proc_entry("fs/f2fs", NULL);
1029 f2fs_destroy_root_stats();
1030 unregister_filesystem(&f2fs_fs_type);
1031 destroy_checkpoint_caches();
1032 destroy_gc_caches();
1033 destroy_node_manager_caches();
1034 destroy_inodecache();
1035 kset_unregister(f2fs_kset);
1038 module_init(init_f2fs_fs)
1039 module_exit(exit_f2fs_fs)
1041 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1042 MODULE_DESCRIPTION("Flash Friendly File System");
1043 MODULE_LICENSE("GPL");