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/sysfs.h>
34 #define CREATE_TRACE_POINTS
35 #include <trace/events/f2fs.h>
37 static struct proc_dir_entry *f2fs_proc_root;
38 static struct kmem_cache *f2fs_inode_cachep;
39 static struct kset *f2fs_kset;
43 Opt_disable_roll_forward,
49 Opt_disable_ext_identify,
53 static match_table_t f2fs_tokens = {
54 {Opt_gc_background, "background_gc=%s"},
55 {Opt_disable_roll_forward, "disable_roll_forward"},
56 {Opt_discard, "discard"},
57 {Opt_noheap, "no_heap"},
58 {Opt_nouser_xattr, "nouser_xattr"},
60 {Opt_active_logs, "active_logs=%u"},
61 {Opt_disable_ext_identify, "disable_ext_identify"},
65 /* Sysfs support for f2fs */
67 struct attribute attr;
68 ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
69 ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
70 const char *, size_t);
74 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
75 struct f2fs_sb_info *sbi, char *buf)
77 struct f2fs_gc_kthread *gc_kth = sbi->gc_thread;
83 ui = (unsigned int *)(((char *)gc_kth) + a->offset);
85 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
88 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
89 struct f2fs_sb_info *sbi,
90 const char *buf, size_t count)
92 struct f2fs_gc_kthread *gc_kth = sbi->gc_thread;
100 ui = (unsigned int *)(((char *)gc_kth) + a->offset);
102 ret = kstrtoul(skip_spaces(buf), 0, &t);
109 static ssize_t f2fs_attr_show(struct kobject *kobj,
110 struct attribute *attr, char *buf)
112 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
114 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
116 return a->show ? a->show(a, sbi, buf) : 0;
119 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
120 const char *buf, size_t len)
122 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
124 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
126 return a->store ? a->store(a, sbi, buf, len) : 0;
129 static void f2fs_sb_release(struct kobject *kobj)
131 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
133 complete(&sbi->s_kobj_unregister);
136 #define F2FS_ATTR_OFFSET(_name, _mode, _show, _store, _elname) \
137 static struct f2fs_attr f2fs_attr_##_name = { \
138 .attr = {.name = __stringify(_name), .mode = _mode }, \
141 .offset = offsetof(struct f2fs_gc_kthread, _elname), \
144 #define F2FS_RW_ATTR(name, elname) \
145 F2FS_ATTR_OFFSET(name, 0644, f2fs_sbi_show, f2fs_sbi_store, elname)
147 F2FS_RW_ATTR(gc_min_sleep_time, min_sleep_time);
148 F2FS_RW_ATTR(gc_max_sleep_time, max_sleep_time);
149 F2FS_RW_ATTR(gc_no_gc_sleep_time, no_gc_sleep_time);
150 F2FS_RW_ATTR(gc_idle, gc_idle);
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),
161 static const struct sysfs_ops f2fs_attr_ops = {
162 .show = f2fs_attr_show,
163 .store = f2fs_attr_store,
166 static struct kobj_type f2fs_ktype = {
167 .default_attrs = f2fs_attrs,
168 .sysfs_ops = &f2fs_attr_ops,
169 .release = f2fs_sb_release,
172 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
174 struct va_format vaf;
180 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
184 static void init_once(void *foo)
186 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
188 inode_init_once(&fi->vfs_inode);
191 static int parse_options(struct super_block *sb, char *options)
193 struct f2fs_sb_info *sbi = F2FS_SB(sb);
194 substring_t args[MAX_OPT_ARGS];
201 while ((p = strsep(&options, ",")) != NULL) {
206 * Initialize args struct so we know whether arg was
207 * found; some options take optional arguments.
209 args[0].to = args[0].from = NULL;
210 token = match_token(p, f2fs_tokens, args);
213 case Opt_gc_background:
214 name = match_strdup(&args[0]);
218 if (!strncmp(name, "on", 2))
220 else if (!strncmp(name, "off", 3))
221 clear_opt(sbi, BG_GC);
228 case Opt_disable_roll_forward:
229 set_opt(sbi, DISABLE_ROLL_FORWARD);
232 set_opt(sbi, DISCARD);
235 set_opt(sbi, NOHEAP);
237 #ifdef CONFIG_F2FS_FS_XATTR
238 case Opt_nouser_xattr:
239 clear_opt(sbi, XATTR_USER);
242 case Opt_nouser_xattr:
243 f2fs_msg(sb, KERN_INFO,
244 "nouser_xattr options not supported");
247 #ifdef CONFIG_F2FS_FS_POSIX_ACL
249 clear_opt(sbi, POSIX_ACL);
253 f2fs_msg(sb, KERN_INFO, "noacl options not supported");
256 case Opt_active_logs:
257 if (args->from && match_int(args, &arg))
259 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
261 sbi->active_logs = arg;
263 case Opt_disable_ext_identify:
264 set_opt(sbi, DISABLE_EXT_IDENTIFY);
267 f2fs_msg(sb, KERN_ERR,
268 "Unrecognized mount option \"%s\" or missing value",
276 static struct inode *f2fs_alloc_inode(struct super_block *sb)
278 struct f2fs_inode_info *fi;
280 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_NOFS | __GFP_ZERO);
284 init_once((void *) fi);
286 /* Initialize f2fs-specific inode info */
287 fi->vfs_inode.i_version = 1;
288 atomic_set(&fi->dirty_dents, 0);
289 fi->i_current_depth = 1;
291 rwlock_init(&fi->ext.ext_lock);
293 set_inode_flag(fi, FI_NEW_INODE);
295 return &fi->vfs_inode;
298 static int f2fs_drop_inode(struct inode *inode)
301 * This is to avoid a deadlock condition like below.
302 * writeback_single_inode(inode)
303 * - f2fs_write_data_page
304 * - f2fs_gc -> iput -> evict
305 * - inode_wait_for_writeback(inode)
307 if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
309 return generic_drop_inode(inode);
313 * f2fs_dirty_inode() is called from __mark_inode_dirty()
315 * We should call set_dirty_inode to write the dirty inode through write_inode.
317 static void f2fs_dirty_inode(struct inode *inode, int flags)
319 set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
323 static void f2fs_i_callback(struct rcu_head *head)
325 struct inode *inode = container_of(head, struct inode, i_rcu);
326 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
329 static void f2fs_destroy_inode(struct inode *inode)
331 call_rcu(&inode->i_rcu, f2fs_i_callback);
334 static void f2fs_put_super(struct super_block *sb)
336 struct f2fs_sb_info *sbi = F2FS_SB(sb);
339 remove_proc_entry("segment_info", sbi->s_proc);
340 remove_proc_entry(sb->s_id, f2fs_proc_root);
342 kobject_del(&sbi->s_kobj);
344 f2fs_destroy_stats(sbi);
347 write_checkpoint(sbi, true);
349 iput(sbi->node_inode);
350 iput(sbi->meta_inode);
352 /* destroy f2fs internal modules */
353 destroy_node_manager(sbi);
354 destroy_segment_manager(sbi);
357 kobject_put(&sbi->s_kobj);
358 wait_for_completion(&sbi->s_kobj_unregister);
360 sb->s_fs_info = NULL;
361 brelse(sbi->raw_super_buf);
365 int f2fs_sync_fs(struct super_block *sb, int sync)
367 struct f2fs_sb_info *sbi = F2FS_SB(sb);
369 trace_f2fs_sync_fs(sb, sync);
371 if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
375 mutex_lock(&sbi->gc_mutex);
376 write_checkpoint(sbi, false);
377 mutex_unlock(&sbi->gc_mutex);
379 f2fs_balance_fs(sbi);
385 static int f2fs_freeze(struct super_block *sb)
389 if (f2fs_readonly(sb))
392 err = f2fs_sync_fs(sb, 1);
396 static int f2fs_unfreeze(struct super_block *sb)
401 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
403 struct super_block *sb = dentry->d_sb;
404 struct f2fs_sb_info *sbi = F2FS_SB(sb);
405 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
406 block_t total_count, user_block_count, start_count, ovp_count;
408 total_count = le64_to_cpu(sbi->raw_super->block_count);
409 user_block_count = sbi->user_block_count;
410 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
411 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
412 buf->f_type = F2FS_SUPER_MAGIC;
413 buf->f_bsize = sbi->blocksize;
415 buf->f_blocks = total_count - start_count;
416 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
417 buf->f_bavail = user_block_count - valid_user_blocks(sbi);
419 buf->f_files = sbi->total_node_count;
420 buf->f_ffree = sbi->total_node_count - valid_inode_count(sbi);
422 buf->f_namelen = F2FS_NAME_LEN;
423 buf->f_fsid.val[0] = (u32)id;
424 buf->f_fsid.val[1] = (u32)(id >> 32);
429 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
431 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
433 if (!(root->d_sb->s_flags & MS_RDONLY) && test_opt(sbi, BG_GC))
434 seq_printf(seq, ",background_gc=%s", "on");
436 seq_printf(seq, ",background_gc=%s", "off");
437 if (test_opt(sbi, DISABLE_ROLL_FORWARD))
438 seq_puts(seq, ",disable_roll_forward");
439 if (test_opt(sbi, DISCARD))
440 seq_puts(seq, ",discard");
441 if (test_opt(sbi, NOHEAP))
442 seq_puts(seq, ",no_heap_alloc");
443 #ifdef CONFIG_F2FS_FS_XATTR
444 if (test_opt(sbi, XATTR_USER))
445 seq_puts(seq, ",user_xattr");
447 seq_puts(seq, ",nouser_xattr");
449 #ifdef CONFIG_F2FS_FS_POSIX_ACL
450 if (test_opt(sbi, POSIX_ACL))
451 seq_puts(seq, ",acl");
453 seq_puts(seq, ",noacl");
455 if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
456 seq_puts(seq, ",disable_ext_identify");
458 seq_printf(seq, ",active_logs=%u", sbi->active_logs);
463 static int segment_info_seq_show(struct seq_file *seq, void *offset)
465 struct super_block *sb = seq->private;
466 struct f2fs_sb_info *sbi = F2FS_SB(sb);
467 unsigned int total_segs = le32_to_cpu(sbi->raw_super->segment_count_main);
470 for (i = 0; i < total_segs; i++) {
471 seq_printf(seq, "%u", get_valid_blocks(sbi, i, 1));
472 if (i != 0 && (i % 10) == 0)
480 static int segment_info_open_fs(struct inode *inode, struct file *file)
482 return single_open(file, segment_info_seq_show, PDE_DATA(inode));
485 static const struct file_operations f2fs_seq_segment_info_fops = {
486 .owner = THIS_MODULE,
487 .open = segment_info_open_fs,
490 .release = single_release,
493 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
495 struct f2fs_sb_info *sbi = F2FS_SB(sb);
496 struct f2fs_mount_info org_mount_opt;
497 int err, active_logs;
500 * Save the old mount options in case we
501 * need to restore them.
503 org_mount_opt = sbi->mount_opt;
504 active_logs = sbi->active_logs;
506 /* parse mount options */
507 err = parse_options(sb, data);
512 * Previous and new state of filesystem is RO,
513 * so no point in checking GC conditions.
515 if ((sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY))
519 * We stop the GC thread if FS is mounted as RO
520 * or if background_gc = off is passed in mount
521 * option. Also sync the filesystem.
523 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
524 if (sbi->gc_thread) {
528 } else if (test_opt(sbi, BG_GC) && !sbi->gc_thread) {
529 err = start_gc_thread(sbi);
534 /* Update the POSIXACL Flag */
535 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
536 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
540 sbi->mount_opt = org_mount_opt;
541 sbi->active_logs = active_logs;
545 static struct super_operations f2fs_sops = {
546 .alloc_inode = f2fs_alloc_inode,
547 .drop_inode = f2fs_drop_inode,
548 .destroy_inode = f2fs_destroy_inode,
549 .write_inode = f2fs_write_inode,
550 .dirty_inode = f2fs_dirty_inode,
551 .show_options = f2fs_show_options,
552 .evict_inode = f2fs_evict_inode,
553 .put_super = f2fs_put_super,
554 .sync_fs = f2fs_sync_fs,
555 .freeze_fs = f2fs_freeze,
556 .unfreeze_fs = f2fs_unfreeze,
557 .statfs = f2fs_statfs,
558 .remount_fs = f2fs_remount,
561 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
562 u64 ino, u32 generation)
564 struct f2fs_sb_info *sbi = F2FS_SB(sb);
567 if (ino < F2FS_ROOT_INO(sbi))
568 return ERR_PTR(-ESTALE);
571 * f2fs_iget isn't quite right if the inode is currently unallocated!
572 * However f2fs_iget currently does appropriate checks to handle stale
573 * inodes so everything is OK.
575 inode = f2fs_iget(sb, ino);
577 return ERR_CAST(inode);
578 if (generation && inode->i_generation != generation) {
579 /* we didn't find the right inode.. */
581 return ERR_PTR(-ESTALE);
586 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
587 int fh_len, int fh_type)
589 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
593 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
594 int fh_len, int fh_type)
596 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
600 static const struct export_operations f2fs_export_ops = {
601 .fh_to_dentry = f2fs_fh_to_dentry,
602 .fh_to_parent = f2fs_fh_to_parent,
603 .get_parent = f2fs_get_parent,
606 static loff_t max_file_size(unsigned bits)
608 loff_t result = ADDRS_PER_INODE;
609 loff_t leaf_count = ADDRS_PER_BLOCK;
611 /* two direct node blocks */
612 result += (leaf_count * 2);
614 /* two indirect node blocks */
615 leaf_count *= NIDS_PER_BLOCK;
616 result += (leaf_count * 2);
618 /* one double indirect node block */
619 leaf_count *= NIDS_PER_BLOCK;
620 result += leaf_count;
626 static int sanity_check_raw_super(struct super_block *sb,
627 struct f2fs_super_block *raw_super)
629 unsigned int blocksize;
631 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
632 f2fs_msg(sb, KERN_INFO,
633 "Magic Mismatch, valid(0x%x) - read(0x%x)",
634 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
638 /* Currently, support only 4KB page cache size */
639 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
640 f2fs_msg(sb, KERN_INFO,
641 "Invalid page_cache_size (%lu), supports only 4KB\n",
646 /* Currently, support only 4KB block size */
647 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
648 if (blocksize != F2FS_BLKSIZE) {
649 f2fs_msg(sb, KERN_INFO,
650 "Invalid blocksize (%u), supports only 4KB\n",
655 if (le32_to_cpu(raw_super->log_sectorsize) !=
656 F2FS_LOG_SECTOR_SIZE) {
657 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize");
660 if (le32_to_cpu(raw_super->log_sectors_per_block) !=
661 F2FS_LOG_SECTORS_PER_BLOCK) {
662 f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block");
668 static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
670 unsigned int total, fsmeta;
671 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
672 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
674 total = le32_to_cpu(raw_super->segment_count);
675 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
676 fsmeta += le32_to_cpu(raw_super->segment_count_sit);
677 fsmeta += le32_to_cpu(raw_super->segment_count_nat);
678 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
679 fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
684 if (is_set_ckpt_flags(ckpt, CP_ERROR_FLAG)) {
685 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
691 static void init_sb_info(struct f2fs_sb_info *sbi)
693 struct f2fs_super_block *raw_super = sbi->raw_super;
696 sbi->log_sectors_per_block =
697 le32_to_cpu(raw_super->log_sectors_per_block);
698 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
699 sbi->blocksize = 1 << sbi->log_blocksize;
700 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
701 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
702 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
703 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
704 sbi->total_sections = le32_to_cpu(raw_super->section_count);
705 sbi->total_node_count =
706 (le32_to_cpu(raw_super->segment_count_nat) / 2)
707 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
708 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
709 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
710 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
711 sbi->cur_victim_sec = NULL_SECNO;
713 for (i = 0; i < NR_COUNT_TYPE; i++)
714 atomic_set(&sbi->nr_pages[i], 0);
717 static int validate_superblock(struct super_block *sb,
718 struct f2fs_super_block **raw_super,
719 struct buffer_head **raw_super_buf, sector_t block)
721 const char *super = (block == 0 ? "first" : "second");
723 /* read f2fs raw super block */
724 *raw_super_buf = sb_bread(sb, block);
725 if (!*raw_super_buf) {
726 f2fs_msg(sb, KERN_ERR, "unable to read %s superblock",
731 *raw_super = (struct f2fs_super_block *)
732 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
734 /* sanity checking of raw super */
735 if (!sanity_check_raw_super(sb, *raw_super))
738 f2fs_msg(sb, KERN_ERR, "Can't find a valid F2FS filesystem "
739 "in %s superblock", super);
743 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
745 struct f2fs_sb_info *sbi;
746 struct f2fs_super_block *raw_super;
747 struct buffer_head *raw_super_buf;
752 /* allocate memory for f2fs-specific super block info */
753 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
757 /* set a block size */
758 if (!sb_set_blocksize(sb, F2FS_BLKSIZE)) {
759 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
763 err = validate_superblock(sb, &raw_super, &raw_super_buf, 0);
765 brelse(raw_super_buf);
766 /* check secondary superblock when primary failed */
767 err = validate_superblock(sb, &raw_super, &raw_super_buf, 1);
772 /* init some FS parameters */
773 sbi->active_logs = NR_CURSEG_TYPE;
777 #ifdef CONFIG_F2FS_FS_XATTR
778 set_opt(sbi, XATTR_USER);
780 #ifdef CONFIG_F2FS_FS_POSIX_ACL
781 set_opt(sbi, POSIX_ACL);
783 /* parse mount options */
784 err = parse_options(sb, (char *)data);
788 sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
789 sb->s_max_links = F2FS_LINK_MAX;
790 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
792 sb->s_op = &f2fs_sops;
793 sb->s_xattr = f2fs_xattr_handlers;
794 sb->s_export_op = &f2fs_export_ops;
795 sb->s_magic = F2FS_SUPER_MAGIC;
797 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
798 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
799 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
801 /* init f2fs-specific super block info */
803 sbi->raw_super = raw_super;
804 sbi->raw_super_buf = raw_super_buf;
805 mutex_init(&sbi->gc_mutex);
806 mutex_init(&sbi->writepages);
807 mutex_init(&sbi->cp_mutex);
808 for (i = 0; i < NR_GLOBAL_LOCKS; i++)
809 mutex_init(&sbi->fs_lock[i]);
810 mutex_init(&sbi->node_write);
812 spin_lock_init(&sbi->stat_lock);
813 init_rwsem(&sbi->bio_sem);
816 /* get an inode for meta space */
817 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
818 if (IS_ERR(sbi->meta_inode)) {
819 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
820 err = PTR_ERR(sbi->meta_inode);
824 err = get_valid_checkpoint(sbi);
826 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
827 goto free_meta_inode;
830 /* sanity checking of checkpoint */
832 if (sanity_check_ckpt(sbi)) {
833 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
837 sbi->total_valid_node_count =
838 le32_to_cpu(sbi->ckpt->valid_node_count);
839 sbi->total_valid_inode_count =
840 le32_to_cpu(sbi->ckpt->valid_inode_count);
841 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
842 sbi->total_valid_block_count =
843 le64_to_cpu(sbi->ckpt->valid_block_count);
844 sbi->last_valid_block_count = sbi->total_valid_block_count;
845 sbi->alloc_valid_block_count = 0;
846 INIT_LIST_HEAD(&sbi->dir_inode_list);
847 spin_lock_init(&sbi->dir_inode_lock);
849 init_orphan_info(sbi);
851 /* setup f2fs internal modules */
852 err = build_segment_manager(sbi);
854 f2fs_msg(sb, KERN_ERR,
855 "Failed to initialize F2FS segment manager");
858 err = build_node_manager(sbi);
860 f2fs_msg(sb, KERN_ERR,
861 "Failed to initialize F2FS node manager");
865 build_gc_manager(sbi);
867 /* get an inode for node space */
868 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
869 if (IS_ERR(sbi->node_inode)) {
870 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
871 err = PTR_ERR(sbi->node_inode);
875 /* if there are nt orphan nodes free them */
877 if (recover_orphan_inodes(sbi))
878 goto free_node_inode;
880 /* read root inode and dentry */
881 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
883 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
885 goto free_node_inode;
887 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size)
888 goto free_root_inode;
890 sb->s_root = d_make_root(root); /* allocate root dentry */
893 goto free_root_inode;
896 /* recover fsynced data */
897 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
898 err = recover_fsync_data(sbi);
900 f2fs_msg(sb, KERN_ERR,
901 "Cannot recover all fsync data errno=%ld", err);
905 * If filesystem is not mounted as read-only then
906 * do start the gc_thread.
908 if (!(sb->s_flags & MS_RDONLY)) {
909 /* After POR, we can run background GC thread.*/
910 err = start_gc_thread(sbi);
915 err = f2fs_build_stats(sbi);
920 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
923 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
924 &f2fs_seq_segment_info_fops, sb);
926 if (test_opt(sbi, DISCARD)) {
927 struct request_queue *q = bdev_get_queue(sb->s_bdev);
928 if (!blk_queue_discard(q))
929 f2fs_msg(sb, KERN_WARNING,
930 "mounting with \"discard\" option, but "
931 "the device does not support discard");
934 sbi->s_kobj.kset = f2fs_kset;
935 init_completion(&sbi->s_kobj_unregister);
936 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
948 iput(sbi->node_inode);
950 destroy_node_manager(sbi);
952 destroy_segment_manager(sbi);
956 make_bad_inode(sbi->meta_inode);
957 iput(sbi->meta_inode);
959 brelse(raw_super_buf);
965 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
966 const char *dev_name, void *data)
968 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
971 static struct file_system_type f2fs_fs_type = {
972 .owner = THIS_MODULE,
975 .kill_sb = kill_block_super,
976 .fs_flags = FS_REQUIRES_DEV,
978 MODULE_ALIAS_FS("f2fs");
980 static int __init init_inodecache(void)
982 f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
983 sizeof(struct f2fs_inode_info), NULL);
984 if (f2fs_inode_cachep == NULL)
989 static void destroy_inodecache(void)
992 * Make sure all delayed rcu free inodes are flushed before we
996 kmem_cache_destroy(f2fs_inode_cachep);
999 static int __init init_f2fs_fs(void)
1003 err = init_inodecache();
1006 err = create_node_manager_caches();
1009 err = create_gc_caches();
1012 err = create_checkpoint_caches();
1015 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1018 err = register_filesystem(&f2fs_fs_type);
1021 f2fs_create_root_stats();
1022 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1027 static void __exit exit_f2fs_fs(void)
1029 remove_proc_entry("fs/f2fs", NULL);
1030 f2fs_destroy_root_stats();
1031 unregister_filesystem(&f2fs_fs_type);
1032 destroy_checkpoint_caches();
1033 destroy_gc_caches();
1034 destroy_node_manager_caches();
1035 destroy_inodecache();
1036 kset_unregister(f2fs_kset);
1039 module_init(init_f2fs_fs)
1040 module_exit(exit_f2fs_fs)
1042 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1043 MODULE_DESCRIPTION("Flash Friendly File System");
1044 MODULE_LICENSE("GPL");