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
,
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"},
63 {Opt_inline_xattr
, "inline_xattr"},
67 /* Sysfs support for f2fs */
69 struct attribute attr
;
70 ssize_t (*show
)(struct f2fs_attr
*, struct f2fs_sb_info
*, char *);
71 ssize_t (*store
)(struct f2fs_attr
*, struct f2fs_sb_info
*,
72 const char *, size_t);
76 static ssize_t
f2fs_sbi_show(struct f2fs_attr
*a
,
77 struct f2fs_sb_info
*sbi
, char *buf
)
79 struct f2fs_gc_kthread
*gc_kth
= sbi
->gc_thread
;
85 ui
= (unsigned int *)(((char *)gc_kth
) + a
->offset
);
87 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
90 static ssize_t
f2fs_sbi_store(struct f2fs_attr
*a
,
91 struct f2fs_sb_info
*sbi
,
92 const char *buf
, size_t count
)
94 struct f2fs_gc_kthread
*gc_kth
= sbi
->gc_thread
;
102 ui
= (unsigned int *)(((char *)gc_kth
) + a
->offset
);
104 ret
= kstrtoul(skip_spaces(buf
), 0, &t
);
111 static ssize_t
f2fs_attr_show(struct kobject
*kobj
,
112 struct attribute
*attr
, char *buf
)
114 struct f2fs_sb_info
*sbi
= container_of(kobj
, struct f2fs_sb_info
,
116 struct f2fs_attr
*a
= container_of(attr
, struct f2fs_attr
, attr
);
118 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
121 static ssize_t
f2fs_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
122 const char *buf
, size_t len
)
124 struct f2fs_sb_info
*sbi
= container_of(kobj
, struct f2fs_sb_info
,
126 struct f2fs_attr
*a
= container_of(attr
, struct f2fs_attr
, attr
);
128 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
131 static void f2fs_sb_release(struct kobject
*kobj
)
133 struct f2fs_sb_info
*sbi
= container_of(kobj
, struct f2fs_sb_info
,
135 complete(&sbi
->s_kobj_unregister
);
138 #define F2FS_ATTR_OFFSET(_name, _mode, _show, _store, _elname) \
139 static struct f2fs_attr f2fs_attr_##_name = { \
140 .attr = {.name = __stringify(_name), .mode = _mode }, \
143 .offset = offsetof(struct f2fs_gc_kthread, _elname), \
146 #define F2FS_RW_ATTR(name, elname) \
147 F2FS_ATTR_OFFSET(name, 0644, f2fs_sbi_show, f2fs_sbi_store, elname)
149 F2FS_RW_ATTR(gc_min_sleep_time
, min_sleep_time
);
150 F2FS_RW_ATTR(gc_max_sleep_time
, max_sleep_time
);
151 F2FS_RW_ATTR(gc_no_gc_sleep_time
, no_gc_sleep_time
);
152 F2FS_RW_ATTR(gc_idle
, gc_idle
);
154 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
155 static struct attribute
*f2fs_attrs
[] = {
156 ATTR_LIST(gc_min_sleep_time
),
157 ATTR_LIST(gc_max_sleep_time
),
158 ATTR_LIST(gc_no_gc_sleep_time
),
163 static const struct sysfs_ops f2fs_attr_ops
= {
164 .show
= f2fs_attr_show
,
165 .store
= f2fs_attr_store
,
168 static struct kobj_type f2fs_ktype
= {
169 .default_attrs
= f2fs_attrs
,
170 .sysfs_ops
= &f2fs_attr_ops
,
171 .release
= f2fs_sb_release
,
174 void f2fs_msg(struct super_block
*sb
, const char *level
, const char *fmt
, ...)
176 struct va_format vaf
;
182 printk("%sF2FS-fs (%s): %pV\n", level
, sb
->s_id
, &vaf
);
186 static void init_once(void *foo
)
188 struct f2fs_inode_info
*fi
= (struct f2fs_inode_info
*) foo
;
190 inode_init_once(&fi
->vfs_inode
);
193 static int parse_options(struct super_block
*sb
, char *options
)
195 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
196 substring_t args
[MAX_OPT_ARGS
];
203 while ((p
= strsep(&options
, ",")) != NULL
) {
208 * Initialize args struct so we know whether arg was
209 * found; some options take optional arguments.
211 args
[0].to
= args
[0].from
= NULL
;
212 token
= match_token(p
, f2fs_tokens
, args
);
215 case Opt_gc_background
:
216 name
= match_strdup(&args
[0]);
220 if (!strncmp(name
, "on", 2))
222 else if (!strncmp(name
, "off", 3))
223 clear_opt(sbi
, BG_GC
);
230 case Opt_disable_roll_forward
:
231 set_opt(sbi
, DISABLE_ROLL_FORWARD
);
234 set_opt(sbi
, DISCARD
);
237 set_opt(sbi
, NOHEAP
);
239 #ifdef CONFIG_F2FS_FS_XATTR
240 case Opt_nouser_xattr
:
241 clear_opt(sbi
, XATTR_USER
);
243 case Opt_inline_xattr
:
244 set_opt(sbi
, INLINE_XATTR
);
247 case Opt_nouser_xattr
:
248 f2fs_msg(sb
, KERN_INFO
,
249 "nouser_xattr options not supported");
251 case Opt_inline_xattr
:
252 f2fs_msg(sb
, KERN_INFO
,
253 "inline_xattr options not supported");
256 #ifdef CONFIG_F2FS_FS_POSIX_ACL
258 clear_opt(sbi
, POSIX_ACL
);
262 f2fs_msg(sb
, KERN_INFO
, "noacl options not supported");
265 case Opt_active_logs
:
266 if (args
->from
&& match_int(args
, &arg
))
268 if (arg
!= 2 && arg
!= 4 && arg
!= NR_CURSEG_TYPE
)
270 sbi
->active_logs
= arg
;
272 case Opt_disable_ext_identify
:
273 set_opt(sbi
, DISABLE_EXT_IDENTIFY
);
276 f2fs_msg(sb
, KERN_ERR
,
277 "Unrecognized mount option \"%s\" or missing value",
285 static struct inode
*f2fs_alloc_inode(struct super_block
*sb
)
287 struct f2fs_inode_info
*fi
;
289 fi
= kmem_cache_alloc(f2fs_inode_cachep
, GFP_NOFS
| __GFP_ZERO
);
293 init_once((void *) fi
);
295 /* Initialize f2fs-specific inode info */
296 fi
->vfs_inode
.i_version
= 1;
297 atomic_set(&fi
->dirty_dents
, 0);
298 fi
->i_current_depth
= 1;
300 rwlock_init(&fi
->ext
.ext_lock
);
302 set_inode_flag(fi
, FI_NEW_INODE
);
304 if (test_opt(F2FS_SB(sb
), INLINE_XATTR
))
305 set_inode_flag(fi
, FI_INLINE_XATTR
);
307 return &fi
->vfs_inode
;
310 static int f2fs_drop_inode(struct inode
*inode
)
313 * This is to avoid a deadlock condition like below.
314 * writeback_single_inode(inode)
315 * - f2fs_write_data_page
316 * - f2fs_gc -> iput -> evict
317 * - inode_wait_for_writeback(inode)
319 if (!inode_unhashed(inode
) && inode
->i_state
& I_SYNC
)
321 return generic_drop_inode(inode
);
325 * f2fs_dirty_inode() is called from __mark_inode_dirty()
327 * We should call set_dirty_inode to write the dirty inode through write_inode.
329 static void f2fs_dirty_inode(struct inode
*inode
, int flags
)
331 set_inode_flag(F2FS_I(inode
), FI_DIRTY_INODE
);
334 static void f2fs_i_callback(struct rcu_head
*head
)
336 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
337 kmem_cache_free(f2fs_inode_cachep
, F2FS_I(inode
));
340 static void f2fs_destroy_inode(struct inode
*inode
)
342 call_rcu(&inode
->i_rcu
, f2fs_i_callback
);
345 static void f2fs_put_super(struct super_block
*sb
)
347 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
350 remove_proc_entry("segment_info", sbi
->s_proc
);
351 remove_proc_entry(sb
->s_id
, f2fs_proc_root
);
353 kobject_del(&sbi
->s_kobj
);
355 f2fs_destroy_stats(sbi
);
358 write_checkpoint(sbi
, true);
360 iput(sbi
->node_inode
);
361 iput(sbi
->meta_inode
);
363 /* destroy f2fs internal modules */
364 destroy_node_manager(sbi
);
365 destroy_segment_manager(sbi
);
368 kobject_put(&sbi
->s_kobj
);
369 wait_for_completion(&sbi
->s_kobj_unregister
);
371 sb
->s_fs_info
= NULL
;
372 brelse(sbi
->raw_super_buf
);
376 int f2fs_sync_fs(struct super_block
*sb
, int sync
)
378 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
380 trace_f2fs_sync_fs(sb
, sync
);
382 if (!sbi
->s_dirty
&& !get_pages(sbi
, F2FS_DIRTY_NODES
))
386 mutex_lock(&sbi
->gc_mutex
);
387 write_checkpoint(sbi
, false);
388 mutex_unlock(&sbi
->gc_mutex
);
390 f2fs_balance_fs(sbi
);
396 static int f2fs_freeze(struct super_block
*sb
)
400 if (f2fs_readonly(sb
))
403 err
= f2fs_sync_fs(sb
, 1);
407 static int f2fs_unfreeze(struct super_block
*sb
)
412 static int f2fs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
414 struct super_block
*sb
= dentry
->d_sb
;
415 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
416 u64 id
= huge_encode_dev(sb
->s_bdev
->bd_dev
);
417 block_t total_count
, user_block_count
, start_count
, ovp_count
;
419 total_count
= le64_to_cpu(sbi
->raw_super
->block_count
);
420 user_block_count
= sbi
->user_block_count
;
421 start_count
= le32_to_cpu(sbi
->raw_super
->segment0_blkaddr
);
422 ovp_count
= SM_I(sbi
)->ovp_segments
<< sbi
->log_blocks_per_seg
;
423 buf
->f_type
= F2FS_SUPER_MAGIC
;
424 buf
->f_bsize
= sbi
->blocksize
;
426 buf
->f_blocks
= total_count
- start_count
;
427 buf
->f_bfree
= buf
->f_blocks
- valid_user_blocks(sbi
) - ovp_count
;
428 buf
->f_bavail
= user_block_count
- valid_user_blocks(sbi
);
430 buf
->f_files
= sbi
->total_node_count
;
431 buf
->f_ffree
= sbi
->total_node_count
- valid_inode_count(sbi
);
433 buf
->f_namelen
= F2FS_NAME_LEN
;
434 buf
->f_fsid
.val
[0] = (u32
)id
;
435 buf
->f_fsid
.val
[1] = (u32
)(id
>> 32);
440 static int f2fs_show_options(struct seq_file
*seq
, struct dentry
*root
)
442 struct f2fs_sb_info
*sbi
= F2FS_SB(root
->d_sb
);
444 if (!(root
->d_sb
->s_flags
& MS_RDONLY
) && test_opt(sbi
, BG_GC
))
445 seq_printf(seq
, ",background_gc=%s", "on");
447 seq_printf(seq
, ",background_gc=%s", "off");
448 if (test_opt(sbi
, DISABLE_ROLL_FORWARD
))
449 seq_puts(seq
, ",disable_roll_forward");
450 if (test_opt(sbi
, DISCARD
))
451 seq_puts(seq
, ",discard");
452 if (test_opt(sbi
, NOHEAP
))
453 seq_puts(seq
, ",no_heap_alloc");
454 #ifdef CONFIG_F2FS_FS_XATTR
455 if (test_opt(sbi
, XATTR_USER
))
456 seq_puts(seq
, ",user_xattr");
458 seq_puts(seq
, ",nouser_xattr");
459 if (test_opt(sbi
, INLINE_XATTR
))
460 seq_puts(seq
, ",inline_xattr");
462 #ifdef CONFIG_F2FS_FS_POSIX_ACL
463 if (test_opt(sbi
, POSIX_ACL
))
464 seq_puts(seq
, ",acl");
466 seq_puts(seq
, ",noacl");
468 if (test_opt(sbi
, DISABLE_EXT_IDENTIFY
))
469 seq_puts(seq
, ",disable_ext_identify");
471 seq_printf(seq
, ",active_logs=%u", sbi
->active_logs
);
476 static int segment_info_seq_show(struct seq_file
*seq
, void *offset
)
478 struct super_block
*sb
= seq
->private;
479 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
480 unsigned int total_segs
= le32_to_cpu(sbi
->raw_super
->segment_count_main
);
483 for (i
= 0; i
< total_segs
; i
++) {
484 seq_printf(seq
, "%u", get_valid_blocks(sbi
, i
, 1));
485 if (i
!= 0 && (i
% 10) == 0)
493 static int segment_info_open_fs(struct inode
*inode
, struct file
*file
)
495 return single_open(file
, segment_info_seq_show
, PDE_DATA(inode
));
498 static const struct file_operations f2fs_seq_segment_info_fops
= {
499 .owner
= THIS_MODULE
,
500 .open
= segment_info_open_fs
,
503 .release
= single_release
,
506 static int f2fs_remount(struct super_block
*sb
, int *flags
, char *data
)
508 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
509 struct f2fs_mount_info org_mount_opt
;
510 int err
, active_logs
;
513 * Save the old mount options in case we
514 * need to restore them.
516 org_mount_opt
= sbi
->mount_opt
;
517 active_logs
= sbi
->active_logs
;
519 /* parse mount options */
520 err
= parse_options(sb
, data
);
525 * Previous and new state of filesystem is RO,
526 * so no point in checking GC conditions.
528 if ((sb
->s_flags
& MS_RDONLY
) && (*flags
& MS_RDONLY
))
532 * We stop the GC thread if FS is mounted as RO
533 * or if background_gc = off is passed in mount
534 * option. Also sync the filesystem.
536 if ((*flags
& MS_RDONLY
) || !test_opt(sbi
, BG_GC
)) {
537 if (sbi
->gc_thread
) {
541 } else if (test_opt(sbi
, BG_GC
) && !sbi
->gc_thread
) {
542 err
= start_gc_thread(sbi
);
547 /* Update the POSIXACL Flag */
548 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
549 (test_opt(sbi
, POSIX_ACL
) ? MS_POSIXACL
: 0);
553 sbi
->mount_opt
= org_mount_opt
;
554 sbi
->active_logs
= active_logs
;
558 static struct super_operations f2fs_sops
= {
559 .alloc_inode
= f2fs_alloc_inode
,
560 .drop_inode
= f2fs_drop_inode
,
561 .destroy_inode
= f2fs_destroy_inode
,
562 .write_inode
= f2fs_write_inode
,
563 .dirty_inode
= f2fs_dirty_inode
,
564 .show_options
= f2fs_show_options
,
565 .evict_inode
= f2fs_evict_inode
,
566 .put_super
= f2fs_put_super
,
567 .sync_fs
= f2fs_sync_fs
,
568 .freeze_fs
= f2fs_freeze
,
569 .unfreeze_fs
= f2fs_unfreeze
,
570 .statfs
= f2fs_statfs
,
571 .remount_fs
= f2fs_remount
,
574 static struct inode
*f2fs_nfs_get_inode(struct super_block
*sb
,
575 u64 ino
, u32 generation
)
577 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
580 if (ino
< F2FS_ROOT_INO(sbi
))
581 return ERR_PTR(-ESTALE
);
584 * f2fs_iget isn't quite right if the inode is currently unallocated!
585 * However f2fs_iget currently does appropriate checks to handle stale
586 * inodes so everything is OK.
588 inode
= f2fs_iget(sb
, ino
);
590 return ERR_CAST(inode
);
591 if (generation
&& inode
->i_generation
!= generation
) {
592 /* we didn't find the right inode.. */
594 return ERR_PTR(-ESTALE
);
599 static struct dentry
*f2fs_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
600 int fh_len
, int fh_type
)
602 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
606 static struct dentry
*f2fs_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
607 int fh_len
, int fh_type
)
609 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
613 static const struct export_operations f2fs_export_ops
= {
614 .fh_to_dentry
= f2fs_fh_to_dentry
,
615 .fh_to_parent
= f2fs_fh_to_parent
,
616 .get_parent
= f2fs_get_parent
,
619 static loff_t
max_file_size(unsigned bits
)
621 loff_t result
= (DEF_ADDRS_PER_INODE
- F2FS_INLINE_XATTR_ADDRS
);
622 loff_t leaf_count
= ADDRS_PER_BLOCK
;
624 /* two direct node blocks */
625 result
+= (leaf_count
* 2);
627 /* two indirect node blocks */
628 leaf_count
*= NIDS_PER_BLOCK
;
629 result
+= (leaf_count
* 2);
631 /* one double indirect node block */
632 leaf_count
*= NIDS_PER_BLOCK
;
633 result
+= leaf_count
;
639 static int sanity_check_raw_super(struct super_block
*sb
,
640 struct f2fs_super_block
*raw_super
)
642 unsigned int blocksize
;
644 if (F2FS_SUPER_MAGIC
!= le32_to_cpu(raw_super
->magic
)) {
645 f2fs_msg(sb
, KERN_INFO
,
646 "Magic Mismatch, valid(0x%x) - read(0x%x)",
647 F2FS_SUPER_MAGIC
, le32_to_cpu(raw_super
->magic
));
651 /* Currently, support only 4KB page cache size */
652 if (F2FS_BLKSIZE
!= PAGE_CACHE_SIZE
) {
653 f2fs_msg(sb
, KERN_INFO
,
654 "Invalid page_cache_size (%lu), supports only 4KB\n",
659 /* Currently, support only 4KB block size */
660 blocksize
= 1 << le32_to_cpu(raw_super
->log_blocksize
);
661 if (blocksize
!= F2FS_BLKSIZE
) {
662 f2fs_msg(sb
, KERN_INFO
,
663 "Invalid blocksize (%u), supports only 4KB\n",
668 if (le32_to_cpu(raw_super
->log_sectorsize
) !=
669 F2FS_LOG_SECTOR_SIZE
) {
670 f2fs_msg(sb
, KERN_INFO
, "Invalid log sectorsize");
673 if (le32_to_cpu(raw_super
->log_sectors_per_block
) !=
674 F2FS_LOG_SECTORS_PER_BLOCK
) {
675 f2fs_msg(sb
, KERN_INFO
, "Invalid log sectors per block");
681 static int sanity_check_ckpt(struct f2fs_sb_info
*sbi
)
683 unsigned int total
, fsmeta
;
684 struct f2fs_super_block
*raw_super
= F2FS_RAW_SUPER(sbi
);
685 struct f2fs_checkpoint
*ckpt
= F2FS_CKPT(sbi
);
687 total
= le32_to_cpu(raw_super
->segment_count
);
688 fsmeta
= le32_to_cpu(raw_super
->segment_count_ckpt
);
689 fsmeta
+= le32_to_cpu(raw_super
->segment_count_sit
);
690 fsmeta
+= le32_to_cpu(raw_super
->segment_count_nat
);
691 fsmeta
+= le32_to_cpu(ckpt
->rsvd_segment_count
);
692 fsmeta
+= le32_to_cpu(raw_super
->segment_count_ssa
);
697 if (is_set_ckpt_flags(ckpt
, CP_ERROR_FLAG
)) {
698 f2fs_msg(sbi
->sb
, KERN_ERR
, "A bug case: need to run fsck");
704 static void init_sb_info(struct f2fs_sb_info
*sbi
)
706 struct f2fs_super_block
*raw_super
= sbi
->raw_super
;
709 sbi
->log_sectors_per_block
=
710 le32_to_cpu(raw_super
->log_sectors_per_block
);
711 sbi
->log_blocksize
= le32_to_cpu(raw_super
->log_blocksize
);
712 sbi
->blocksize
= 1 << sbi
->log_blocksize
;
713 sbi
->log_blocks_per_seg
= le32_to_cpu(raw_super
->log_blocks_per_seg
);
714 sbi
->blocks_per_seg
= 1 << sbi
->log_blocks_per_seg
;
715 sbi
->segs_per_sec
= le32_to_cpu(raw_super
->segs_per_sec
);
716 sbi
->secs_per_zone
= le32_to_cpu(raw_super
->secs_per_zone
);
717 sbi
->total_sections
= le32_to_cpu(raw_super
->section_count
);
718 sbi
->total_node_count
=
719 (le32_to_cpu(raw_super
->segment_count_nat
) / 2)
720 * sbi
->blocks_per_seg
* NAT_ENTRY_PER_BLOCK
;
721 sbi
->root_ino_num
= le32_to_cpu(raw_super
->root_ino
);
722 sbi
->node_ino_num
= le32_to_cpu(raw_super
->node_ino
);
723 sbi
->meta_ino_num
= le32_to_cpu(raw_super
->meta_ino
);
724 sbi
->cur_victim_sec
= NULL_SECNO
;
726 for (i
= 0; i
< NR_COUNT_TYPE
; i
++)
727 atomic_set(&sbi
->nr_pages
[i
], 0);
730 static int validate_superblock(struct super_block
*sb
,
731 struct f2fs_super_block
**raw_super
,
732 struct buffer_head
**raw_super_buf
, sector_t block
)
734 const char *super
= (block
== 0 ? "first" : "second");
736 /* read f2fs raw super block */
737 *raw_super_buf
= sb_bread(sb
, block
);
738 if (!*raw_super_buf
) {
739 f2fs_msg(sb
, KERN_ERR
, "unable to read %s superblock",
744 *raw_super
= (struct f2fs_super_block
*)
745 ((char *)(*raw_super_buf
)->b_data
+ F2FS_SUPER_OFFSET
);
747 /* sanity checking of raw super */
748 if (!sanity_check_raw_super(sb
, *raw_super
))
751 f2fs_msg(sb
, KERN_ERR
, "Can't find a valid F2FS filesystem "
752 "in %s superblock", super
);
756 static int f2fs_fill_super(struct super_block
*sb
, void *data
, int silent
)
758 struct f2fs_sb_info
*sbi
;
759 struct f2fs_super_block
*raw_super
;
760 struct buffer_head
*raw_super_buf
;
765 /* allocate memory for f2fs-specific super block info */
766 sbi
= kzalloc(sizeof(struct f2fs_sb_info
), GFP_KERNEL
);
770 /* set a block size */
771 if (!sb_set_blocksize(sb
, F2FS_BLKSIZE
)) {
772 f2fs_msg(sb
, KERN_ERR
, "unable to set blocksize");
776 err
= validate_superblock(sb
, &raw_super
, &raw_super_buf
, 0);
778 brelse(raw_super_buf
);
779 /* check secondary superblock when primary failed */
780 err
= validate_superblock(sb
, &raw_super
, &raw_super_buf
, 1);
785 /* init some FS parameters */
786 sbi
->active_logs
= NR_CURSEG_TYPE
;
790 #ifdef CONFIG_F2FS_FS_XATTR
791 set_opt(sbi
, XATTR_USER
);
793 #ifdef CONFIG_F2FS_FS_POSIX_ACL
794 set_opt(sbi
, POSIX_ACL
);
796 /* parse mount options */
797 err
= parse_options(sb
, (char *)data
);
801 sb
->s_maxbytes
= max_file_size(le32_to_cpu(raw_super
->log_blocksize
));
802 sb
->s_max_links
= F2FS_LINK_MAX
;
803 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
805 sb
->s_op
= &f2fs_sops
;
806 sb
->s_xattr
= f2fs_xattr_handlers
;
807 sb
->s_export_op
= &f2fs_export_ops
;
808 sb
->s_magic
= F2FS_SUPER_MAGIC
;
810 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
811 (test_opt(sbi
, POSIX_ACL
) ? MS_POSIXACL
: 0);
812 memcpy(sb
->s_uuid
, raw_super
->uuid
, sizeof(raw_super
->uuid
));
814 /* init f2fs-specific super block info */
816 sbi
->raw_super
= raw_super
;
817 sbi
->raw_super_buf
= raw_super_buf
;
818 mutex_init(&sbi
->gc_mutex
);
819 mutex_init(&sbi
->writepages
);
820 mutex_init(&sbi
->cp_mutex
);
821 for (i
= 0; i
< NR_GLOBAL_LOCKS
; i
++)
822 mutex_init(&sbi
->fs_lock
[i
]);
823 mutex_init(&sbi
->node_write
);
825 spin_lock_init(&sbi
->stat_lock
);
826 init_rwsem(&sbi
->bio_sem
);
829 /* get an inode for meta space */
830 sbi
->meta_inode
= f2fs_iget(sb
, F2FS_META_INO(sbi
));
831 if (IS_ERR(sbi
->meta_inode
)) {
832 f2fs_msg(sb
, KERN_ERR
, "Failed to read F2FS meta data inode");
833 err
= PTR_ERR(sbi
->meta_inode
);
837 err
= get_valid_checkpoint(sbi
);
839 f2fs_msg(sb
, KERN_ERR
, "Failed to get valid F2FS checkpoint");
840 goto free_meta_inode
;
843 /* sanity checking of checkpoint */
845 if (sanity_check_ckpt(sbi
)) {
846 f2fs_msg(sb
, KERN_ERR
, "Invalid F2FS checkpoint");
850 sbi
->total_valid_node_count
=
851 le32_to_cpu(sbi
->ckpt
->valid_node_count
);
852 sbi
->total_valid_inode_count
=
853 le32_to_cpu(sbi
->ckpt
->valid_inode_count
);
854 sbi
->user_block_count
= le64_to_cpu(sbi
->ckpt
->user_block_count
);
855 sbi
->total_valid_block_count
=
856 le64_to_cpu(sbi
->ckpt
->valid_block_count
);
857 sbi
->last_valid_block_count
= sbi
->total_valid_block_count
;
858 sbi
->alloc_valid_block_count
= 0;
859 INIT_LIST_HEAD(&sbi
->dir_inode_list
);
860 spin_lock_init(&sbi
->dir_inode_lock
);
862 init_orphan_info(sbi
);
864 /* setup f2fs internal modules */
865 err
= build_segment_manager(sbi
);
867 f2fs_msg(sb
, KERN_ERR
,
868 "Failed to initialize F2FS segment manager");
871 err
= build_node_manager(sbi
);
873 f2fs_msg(sb
, KERN_ERR
,
874 "Failed to initialize F2FS node manager");
878 build_gc_manager(sbi
);
880 /* get an inode for node space */
881 sbi
->node_inode
= f2fs_iget(sb
, F2FS_NODE_INO(sbi
));
882 if (IS_ERR(sbi
->node_inode
)) {
883 f2fs_msg(sb
, KERN_ERR
, "Failed to read node inode");
884 err
= PTR_ERR(sbi
->node_inode
);
888 /* if there are nt orphan nodes free them */
890 if (recover_orphan_inodes(sbi
))
891 goto free_node_inode
;
893 /* read root inode and dentry */
894 root
= f2fs_iget(sb
, F2FS_ROOT_INO(sbi
));
896 f2fs_msg(sb
, KERN_ERR
, "Failed to read root inode");
898 goto free_node_inode
;
900 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
)
901 goto free_root_inode
;
903 sb
->s_root
= d_make_root(root
); /* allocate root dentry */
906 goto free_root_inode
;
909 /* recover fsynced data */
910 if (!test_opt(sbi
, DISABLE_ROLL_FORWARD
)) {
911 err
= recover_fsync_data(sbi
);
913 f2fs_msg(sb
, KERN_ERR
,
914 "Cannot recover all fsync data errno=%ld", err
);
918 * If filesystem is not mounted as read-only then
919 * do start the gc_thread.
921 if (!(sb
->s_flags
& MS_RDONLY
)) {
922 /* After POR, we can run background GC thread.*/
923 err
= start_gc_thread(sbi
);
928 err
= f2fs_build_stats(sbi
);
933 sbi
->s_proc
= proc_mkdir(sb
->s_id
, f2fs_proc_root
);
936 proc_create_data("segment_info", S_IRUGO
, sbi
->s_proc
,
937 &f2fs_seq_segment_info_fops
, sb
);
939 if (test_opt(sbi
, DISCARD
)) {
940 struct request_queue
*q
= bdev_get_queue(sb
->s_bdev
);
941 if (!blk_queue_discard(q
))
942 f2fs_msg(sb
, KERN_WARNING
,
943 "mounting with \"discard\" option, but "
944 "the device does not support discard");
947 sbi
->s_kobj
.kset
= f2fs_kset
;
948 init_completion(&sbi
->s_kobj_unregister
);
949 err
= kobject_init_and_add(&sbi
->s_kobj
, &f2fs_ktype
, NULL
,
961 iput(sbi
->node_inode
);
963 destroy_node_manager(sbi
);
965 destroy_segment_manager(sbi
);
969 make_bad_inode(sbi
->meta_inode
);
970 iput(sbi
->meta_inode
);
972 brelse(raw_super_buf
);
978 static struct dentry
*f2fs_mount(struct file_system_type
*fs_type
, int flags
,
979 const char *dev_name
, void *data
)
981 return mount_bdev(fs_type
, flags
, dev_name
, data
, f2fs_fill_super
);
984 static struct file_system_type f2fs_fs_type
= {
985 .owner
= THIS_MODULE
,
988 .kill_sb
= kill_block_super
,
989 .fs_flags
= FS_REQUIRES_DEV
,
991 MODULE_ALIAS_FS("f2fs");
993 static int __init
init_inodecache(void)
995 f2fs_inode_cachep
= f2fs_kmem_cache_create("f2fs_inode_cache",
996 sizeof(struct f2fs_inode_info
), NULL
);
997 if (f2fs_inode_cachep
== NULL
)
1002 static void destroy_inodecache(void)
1005 * Make sure all delayed rcu free inodes are flushed before we
1009 kmem_cache_destroy(f2fs_inode_cachep
);
1012 static int __init
init_f2fs_fs(void)
1016 err
= init_inodecache();
1019 err
= create_node_manager_caches();
1021 goto free_inodecache
;
1022 err
= create_gc_caches();
1024 goto free_node_manager_caches
;
1025 err
= create_checkpoint_caches();
1027 goto free_gc_caches
;
1028 f2fs_kset
= kset_create_and_add("f2fs", NULL
, fs_kobj
);
1031 goto free_checkpoint_caches
;
1033 err
= register_filesystem(&f2fs_fs_type
);
1036 f2fs_create_root_stats();
1037 f2fs_proc_root
= proc_mkdir("fs/f2fs", NULL
);
1041 kset_unregister(f2fs_kset
);
1042 free_checkpoint_caches
:
1043 destroy_checkpoint_caches();
1045 destroy_gc_caches();
1046 free_node_manager_caches
:
1047 destroy_node_manager_caches();
1049 destroy_inodecache();
1054 static void __exit
exit_f2fs_fs(void)
1056 remove_proc_entry("fs/f2fs", NULL
);
1057 f2fs_destroy_root_stats();
1058 unregister_filesystem(&f2fs_fs_type
);
1059 destroy_checkpoint_caches();
1060 destroy_gc_caches();
1061 destroy_node_manager_caches();
1062 destroy_inodecache();
1063 kset_unregister(f2fs_kset
);
1066 module_init(init_f2fs_fs
)
1067 module_exit(exit_f2fs_fs
)
1069 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1070 MODULE_DESCRIPTION("Flash Friendly File System");
1071 MODULE_LICENSE("GPL");