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
,
51 Opt_disable_ext_identify
,
58 static match_table_t f2fs_tokens
= {
59 {Opt_gc_background
, "background_gc=%s"},
60 {Opt_disable_roll_forward
, "disable_roll_forward"},
61 {Opt_discard
, "discard"},
62 {Opt_noheap
, "no_heap"},
63 {Opt_user_xattr
, "user_xattr"},
64 {Opt_nouser_xattr
, "nouser_xattr"},
67 {Opt_active_logs
, "active_logs=%u"},
68 {Opt_disable_ext_identify
, "disable_ext_identify"},
69 {Opt_inline_xattr
, "inline_xattr"},
70 {Opt_inline_data
, "inline_data"},
71 {Opt_flush_merge
, "flush_merge"},
75 /* Sysfs support for f2fs */
77 GC_THREAD
, /* struct f2fs_gc_thread */
78 SM_INFO
, /* struct f2fs_sm_info */
79 NM_INFO
, /* struct f2fs_nm_info */
80 F2FS_SBI
, /* struct f2fs_sb_info */
84 struct attribute attr
;
85 ssize_t (*show
)(struct f2fs_attr
*, struct f2fs_sb_info
*, char *);
86 ssize_t (*store
)(struct f2fs_attr
*, struct f2fs_sb_info
*,
87 const char *, size_t);
92 static unsigned char *__struct_ptr(struct f2fs_sb_info
*sbi
, int struct_type
)
94 if (struct_type
== GC_THREAD
)
95 return (unsigned char *)sbi
->gc_thread
;
96 else if (struct_type
== SM_INFO
)
97 return (unsigned char *)SM_I(sbi
);
98 else if (struct_type
== NM_INFO
)
99 return (unsigned char *)NM_I(sbi
);
100 else if (struct_type
== F2FS_SBI
)
101 return (unsigned char *)sbi
;
105 static ssize_t
f2fs_sbi_show(struct f2fs_attr
*a
,
106 struct f2fs_sb_info
*sbi
, char *buf
)
108 unsigned char *ptr
= NULL
;
111 ptr
= __struct_ptr(sbi
, a
->struct_type
);
115 ui
= (unsigned int *)(ptr
+ a
->offset
);
117 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
120 static ssize_t
f2fs_sbi_store(struct f2fs_attr
*a
,
121 struct f2fs_sb_info
*sbi
,
122 const char *buf
, size_t count
)
129 ptr
= __struct_ptr(sbi
, a
->struct_type
);
133 ui
= (unsigned int *)(ptr
+ a
->offset
);
135 ret
= kstrtoul(skip_spaces(buf
), 0, &t
);
142 static ssize_t
f2fs_attr_show(struct kobject
*kobj
,
143 struct attribute
*attr
, char *buf
)
145 struct f2fs_sb_info
*sbi
= container_of(kobj
, struct f2fs_sb_info
,
147 struct f2fs_attr
*a
= container_of(attr
, struct f2fs_attr
, attr
);
149 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
152 static ssize_t
f2fs_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
153 const char *buf
, size_t len
)
155 struct f2fs_sb_info
*sbi
= container_of(kobj
, struct f2fs_sb_info
,
157 struct f2fs_attr
*a
= container_of(attr
, struct f2fs_attr
, attr
);
159 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
162 static void f2fs_sb_release(struct kobject
*kobj
)
164 struct f2fs_sb_info
*sbi
= container_of(kobj
, struct f2fs_sb_info
,
166 complete(&sbi
->s_kobj_unregister
);
169 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
170 static struct f2fs_attr f2fs_attr_##_name = { \
171 .attr = {.name = __stringify(_name), .mode = _mode }, \
174 .struct_type = _struct_type, \
178 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \
179 F2FS_ATTR_OFFSET(struct_type, name, 0644, \
180 f2fs_sbi_show, f2fs_sbi_store, \
181 offsetof(struct struct_name, elname))
183 F2FS_RW_ATTR(GC_THREAD
, f2fs_gc_kthread
, gc_min_sleep_time
, min_sleep_time
);
184 F2FS_RW_ATTR(GC_THREAD
, f2fs_gc_kthread
, gc_max_sleep_time
, max_sleep_time
);
185 F2FS_RW_ATTR(GC_THREAD
, f2fs_gc_kthread
, gc_no_gc_sleep_time
, no_gc_sleep_time
);
186 F2FS_RW_ATTR(GC_THREAD
, f2fs_gc_kthread
, gc_idle
, gc_idle
);
187 F2FS_RW_ATTR(SM_INFO
, f2fs_sm_info
, reclaim_segments
, rec_prefree_segments
);
188 F2FS_RW_ATTR(SM_INFO
, f2fs_sm_info
, max_small_discards
, max_discards
);
189 F2FS_RW_ATTR(SM_INFO
, f2fs_sm_info
, ipu_policy
, ipu_policy
);
190 F2FS_RW_ATTR(SM_INFO
, f2fs_sm_info
, min_ipu_util
, min_ipu_util
);
191 F2FS_RW_ATTR(NM_INFO
, f2fs_nm_info
, ram_thresh
, ram_thresh
);
192 F2FS_RW_ATTR(F2FS_SBI
, f2fs_sb_info
, max_victim_search
, max_victim_search
);
193 F2FS_RW_ATTR(F2FS_SBI
, f2fs_sb_info
, dir_level
, dir_level
);
195 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
196 static struct attribute
*f2fs_attrs
[] = {
197 ATTR_LIST(gc_min_sleep_time
),
198 ATTR_LIST(gc_max_sleep_time
),
199 ATTR_LIST(gc_no_gc_sleep_time
),
201 ATTR_LIST(reclaim_segments
),
202 ATTR_LIST(max_small_discards
),
203 ATTR_LIST(ipu_policy
),
204 ATTR_LIST(min_ipu_util
),
205 ATTR_LIST(max_victim_search
),
206 ATTR_LIST(dir_level
),
207 ATTR_LIST(ram_thresh
),
211 static const struct sysfs_ops f2fs_attr_ops
= {
212 .show
= f2fs_attr_show
,
213 .store
= f2fs_attr_store
,
216 static struct kobj_type f2fs_ktype
= {
217 .default_attrs
= f2fs_attrs
,
218 .sysfs_ops
= &f2fs_attr_ops
,
219 .release
= f2fs_sb_release
,
222 void f2fs_msg(struct super_block
*sb
, const char *level
, const char *fmt
, ...)
224 struct va_format vaf
;
230 printk("%sF2FS-fs (%s): %pV\n", level
, sb
->s_id
, &vaf
);
234 static void init_once(void *foo
)
236 struct f2fs_inode_info
*fi
= (struct f2fs_inode_info
*) foo
;
238 inode_init_once(&fi
->vfs_inode
);
241 static int parse_options(struct super_block
*sb
, char *options
)
243 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
244 substring_t args
[MAX_OPT_ARGS
];
251 while ((p
= strsep(&options
, ",")) != NULL
) {
256 * Initialize args struct so we know whether arg was
257 * found; some options take optional arguments.
259 args
[0].to
= args
[0].from
= NULL
;
260 token
= match_token(p
, f2fs_tokens
, args
);
263 case Opt_gc_background
:
264 name
= match_strdup(&args
[0]);
268 if (strlen(name
) == 2 && !strncmp(name
, "on", 2))
270 else if (strlen(name
) == 3 && !strncmp(name
, "off", 3))
271 clear_opt(sbi
, BG_GC
);
278 case Opt_disable_roll_forward
:
279 set_opt(sbi
, DISABLE_ROLL_FORWARD
);
282 set_opt(sbi
, DISCARD
);
285 set_opt(sbi
, NOHEAP
);
287 #ifdef CONFIG_F2FS_FS_XATTR
289 set_opt(sbi
, XATTR_USER
);
291 case Opt_nouser_xattr
:
292 clear_opt(sbi
, XATTR_USER
);
294 case Opt_inline_xattr
:
295 set_opt(sbi
, INLINE_XATTR
);
299 f2fs_msg(sb
, KERN_INFO
,
300 "user_xattr options not supported");
302 case Opt_nouser_xattr
:
303 f2fs_msg(sb
, KERN_INFO
,
304 "nouser_xattr options not supported");
306 case Opt_inline_xattr
:
307 f2fs_msg(sb
, KERN_INFO
,
308 "inline_xattr options not supported");
311 #ifdef CONFIG_F2FS_FS_POSIX_ACL
313 set_opt(sbi
, POSIX_ACL
);
316 clear_opt(sbi
, POSIX_ACL
);
320 f2fs_msg(sb
, KERN_INFO
, "acl options not supported");
323 f2fs_msg(sb
, KERN_INFO
, "noacl options not supported");
326 case Opt_active_logs
:
327 if (args
->from
&& match_int(args
, &arg
))
329 if (arg
!= 2 && arg
!= 4 && arg
!= NR_CURSEG_TYPE
)
331 sbi
->active_logs
= arg
;
333 case Opt_disable_ext_identify
:
334 set_opt(sbi
, DISABLE_EXT_IDENTIFY
);
336 case Opt_inline_data
:
337 set_opt(sbi
, INLINE_DATA
);
339 case Opt_flush_merge
:
340 set_opt(sbi
, FLUSH_MERGE
);
343 f2fs_msg(sb
, KERN_ERR
,
344 "Unrecognized mount option \"%s\" or missing value",
352 static struct inode
*f2fs_alloc_inode(struct super_block
*sb
)
354 struct f2fs_inode_info
*fi
;
356 fi
= kmem_cache_alloc(f2fs_inode_cachep
, GFP_F2FS_ZERO
);
360 init_once((void *) fi
);
362 /* Initialize f2fs-specific inode info */
363 fi
->vfs_inode
.i_version
= 1;
364 atomic_set(&fi
->dirty_dents
, 0);
365 fi
->i_current_depth
= 1;
367 rwlock_init(&fi
->ext
.ext_lock
);
368 init_rwsem(&fi
->i_sem
);
370 set_inode_flag(fi
, FI_NEW_INODE
);
372 if (test_opt(F2FS_SB(sb
), INLINE_XATTR
))
373 set_inode_flag(fi
, FI_INLINE_XATTR
);
375 /* Will be used by directory only */
376 fi
->i_dir_level
= F2FS_SB(sb
)->dir_level
;
378 return &fi
->vfs_inode
;
381 static int f2fs_drop_inode(struct inode
*inode
)
384 * This is to avoid a deadlock condition like below.
385 * writeback_single_inode(inode)
386 * - f2fs_write_data_page
387 * - f2fs_gc -> iput -> evict
388 * - inode_wait_for_writeback(inode)
390 if (!inode_unhashed(inode
) && inode
->i_state
& I_SYNC
)
392 return generic_drop_inode(inode
);
396 * f2fs_dirty_inode() is called from __mark_inode_dirty()
398 * We should call set_dirty_inode to write the dirty inode through write_inode.
400 static void f2fs_dirty_inode(struct inode
*inode
, int flags
)
402 set_inode_flag(F2FS_I(inode
), FI_DIRTY_INODE
);
405 static void f2fs_i_callback(struct rcu_head
*head
)
407 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
408 kmem_cache_free(f2fs_inode_cachep
, F2FS_I(inode
));
411 static void f2fs_destroy_inode(struct inode
*inode
)
413 call_rcu(&inode
->i_rcu
, f2fs_i_callback
);
416 static void f2fs_put_super(struct super_block
*sb
)
418 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
421 remove_proc_entry("segment_info", sbi
->s_proc
);
422 remove_proc_entry(sb
->s_id
, f2fs_proc_root
);
424 kobject_del(&sbi
->s_kobj
);
426 f2fs_destroy_stats(sbi
);
429 /* We don't need to do checkpoint when it's clean */
430 if (sbi
->s_dirty
&& get_pages(sbi
, F2FS_DIRTY_NODES
))
431 write_checkpoint(sbi
, true);
433 iput(sbi
->node_inode
);
434 iput(sbi
->meta_inode
);
436 /* destroy f2fs internal modules */
437 destroy_node_manager(sbi
);
438 destroy_segment_manager(sbi
);
441 kobject_put(&sbi
->s_kobj
);
442 wait_for_completion(&sbi
->s_kobj_unregister
);
444 sb
->s_fs_info
= NULL
;
445 brelse(sbi
->raw_super_buf
);
449 int f2fs_sync_fs(struct super_block
*sb
, int sync
)
451 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
453 trace_f2fs_sync_fs(sb
, sync
);
455 if (!sbi
->s_dirty
&& !get_pages(sbi
, F2FS_DIRTY_NODES
))
459 mutex_lock(&sbi
->gc_mutex
);
460 write_checkpoint(sbi
, false);
461 mutex_unlock(&sbi
->gc_mutex
);
463 f2fs_balance_fs(sbi
);
469 static int f2fs_freeze(struct super_block
*sb
)
473 if (f2fs_readonly(sb
))
476 err
= f2fs_sync_fs(sb
, 1);
480 static int f2fs_unfreeze(struct super_block
*sb
)
485 static int f2fs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
487 struct super_block
*sb
= dentry
->d_sb
;
488 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
489 u64 id
= huge_encode_dev(sb
->s_bdev
->bd_dev
);
490 block_t total_count
, user_block_count
, start_count
, ovp_count
;
492 total_count
= le64_to_cpu(sbi
->raw_super
->block_count
);
493 user_block_count
= sbi
->user_block_count
;
494 start_count
= le32_to_cpu(sbi
->raw_super
->segment0_blkaddr
);
495 ovp_count
= SM_I(sbi
)->ovp_segments
<< sbi
->log_blocks_per_seg
;
496 buf
->f_type
= F2FS_SUPER_MAGIC
;
497 buf
->f_bsize
= sbi
->blocksize
;
499 buf
->f_blocks
= total_count
- start_count
;
500 buf
->f_bfree
= buf
->f_blocks
- valid_user_blocks(sbi
) - ovp_count
;
501 buf
->f_bavail
= user_block_count
- valid_user_blocks(sbi
);
503 buf
->f_files
= sbi
->total_node_count
;
504 buf
->f_ffree
= sbi
->total_node_count
- valid_inode_count(sbi
);
506 buf
->f_namelen
= F2FS_NAME_LEN
;
507 buf
->f_fsid
.val
[0] = (u32
)id
;
508 buf
->f_fsid
.val
[1] = (u32
)(id
>> 32);
513 static int f2fs_show_options(struct seq_file
*seq
, struct dentry
*root
)
515 struct f2fs_sb_info
*sbi
= F2FS_SB(root
->d_sb
);
517 if (!f2fs_readonly(sbi
->sb
) && test_opt(sbi
, BG_GC
))
518 seq_printf(seq
, ",background_gc=%s", "on");
520 seq_printf(seq
, ",background_gc=%s", "off");
521 if (test_opt(sbi
, DISABLE_ROLL_FORWARD
))
522 seq_puts(seq
, ",disable_roll_forward");
523 if (test_opt(sbi
, DISCARD
))
524 seq_puts(seq
, ",discard");
525 if (test_opt(sbi
, NOHEAP
))
526 seq_puts(seq
, ",no_heap_alloc");
527 #ifdef CONFIG_F2FS_FS_XATTR
528 if (test_opt(sbi
, XATTR_USER
))
529 seq_puts(seq
, ",user_xattr");
531 seq_puts(seq
, ",nouser_xattr");
532 if (test_opt(sbi
, INLINE_XATTR
))
533 seq_puts(seq
, ",inline_xattr");
535 #ifdef CONFIG_F2FS_FS_POSIX_ACL
536 if (test_opt(sbi
, POSIX_ACL
))
537 seq_puts(seq
, ",acl");
539 seq_puts(seq
, ",noacl");
541 if (test_opt(sbi
, DISABLE_EXT_IDENTIFY
))
542 seq_puts(seq
, ",disable_ext_identify");
543 if (test_opt(sbi
, INLINE_DATA
))
544 seq_puts(seq
, ",inline_data");
545 if (!f2fs_readonly(sbi
->sb
) && test_opt(sbi
, FLUSH_MERGE
))
546 seq_puts(seq
, ",flush_merge");
547 seq_printf(seq
, ",active_logs=%u", sbi
->active_logs
);
552 static int segment_info_seq_show(struct seq_file
*seq
, void *offset
)
554 struct super_block
*sb
= seq
->private;
555 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
556 unsigned int total_segs
=
557 le32_to_cpu(sbi
->raw_super
->segment_count_main
);
560 seq_puts(seq
, "format: segment_type|valid_blocks\n"
561 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
563 for (i
= 0; i
< total_segs
; i
++) {
564 struct seg_entry
*se
= get_seg_entry(sbi
, i
);
567 seq_printf(seq
, "%-5d", i
);
568 seq_printf(seq
, "%d|%-3u", se
->type
,
569 get_valid_blocks(sbi
, i
, 1));
570 if ((i
% 10) == 9 || i
== (total_segs
- 1))
579 static int segment_info_open_fs(struct inode
*inode
, struct file
*file
)
581 return single_open(file
, segment_info_seq_show
, PDE_DATA(inode
));
584 static const struct file_operations f2fs_seq_segment_info_fops
= {
585 .owner
= THIS_MODULE
,
586 .open
= segment_info_open_fs
,
589 .release
= single_release
,
592 static int f2fs_remount(struct super_block
*sb
, int *flags
, char *data
)
594 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
595 struct f2fs_mount_info org_mount_opt
;
596 int err
, active_logs
;
597 bool need_restart_gc
= false;
598 bool need_stop_gc
= false;
603 * Save the old mount options in case we
604 * need to restore them.
606 org_mount_opt
= sbi
->mount_opt
;
607 active_logs
= sbi
->active_logs
;
609 /* parse mount options */
610 err
= parse_options(sb
, data
);
615 * Previous and new state of filesystem is RO,
616 * so skip checking GC and FLUSH_MERGE conditions.
618 if ((sb
->s_flags
& MS_RDONLY
) && (*flags
& MS_RDONLY
))
622 * We stop the GC thread if FS is mounted as RO
623 * or if background_gc = off is passed in mount
624 * option. Also sync the filesystem.
626 if ((*flags
& MS_RDONLY
) || !test_opt(sbi
, BG_GC
)) {
627 if (sbi
->gc_thread
) {
630 need_restart_gc
= true;
632 } else if (test_opt(sbi
, BG_GC
) && !sbi
->gc_thread
) {
633 err
= start_gc_thread(sbi
);
640 * We stop issue flush thread if FS is mounted as RO
641 * or if flush_merge is not passed in mount option.
643 if ((*flags
& MS_RDONLY
) || !test_opt(sbi
, FLUSH_MERGE
)) {
644 destroy_flush_cmd_control(sbi
);
645 } else if (test_opt(sbi
, FLUSH_MERGE
) &&
646 !sbi
->sm_info
->cmd_control_info
) {
647 err
= create_flush_cmd_control(sbi
);
652 /* Update the POSIXACL Flag */
653 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
654 (test_opt(sbi
, POSIX_ACL
) ? MS_POSIXACL
: 0);
657 if (need_restart_gc
) {
658 if (start_gc_thread(sbi
))
659 f2fs_msg(sbi
->sb
, KERN_WARNING
,
660 "background gc thread is stop");
661 } else if (need_stop_gc
) {
665 sbi
->mount_opt
= org_mount_opt
;
666 sbi
->active_logs
= active_logs
;
670 static struct super_operations f2fs_sops
= {
671 .alloc_inode
= f2fs_alloc_inode
,
672 .drop_inode
= f2fs_drop_inode
,
673 .destroy_inode
= f2fs_destroy_inode
,
674 .write_inode
= f2fs_write_inode
,
675 .dirty_inode
= f2fs_dirty_inode
,
676 .show_options
= f2fs_show_options
,
677 .evict_inode
= f2fs_evict_inode
,
678 .put_super
= f2fs_put_super
,
679 .sync_fs
= f2fs_sync_fs
,
680 .freeze_fs
= f2fs_freeze
,
681 .unfreeze_fs
= f2fs_unfreeze
,
682 .statfs
= f2fs_statfs
,
683 .remount_fs
= f2fs_remount
,
686 static struct inode
*f2fs_nfs_get_inode(struct super_block
*sb
,
687 u64 ino
, u32 generation
)
689 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
692 if (check_nid_range(sbi
, ino
))
693 return ERR_PTR(-ESTALE
);
696 * f2fs_iget isn't quite right if the inode is currently unallocated!
697 * However f2fs_iget currently does appropriate checks to handle stale
698 * inodes so everything is OK.
700 inode
= f2fs_iget(sb
, ino
);
702 return ERR_CAST(inode
);
703 if (unlikely(generation
&& inode
->i_generation
!= generation
)) {
704 /* we didn't find the right inode.. */
706 return ERR_PTR(-ESTALE
);
711 static struct dentry
*f2fs_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
712 int fh_len
, int fh_type
)
714 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
718 static struct dentry
*f2fs_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
719 int fh_len
, int fh_type
)
721 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
725 static const struct export_operations f2fs_export_ops
= {
726 .fh_to_dentry
= f2fs_fh_to_dentry
,
727 .fh_to_parent
= f2fs_fh_to_parent
,
728 .get_parent
= f2fs_get_parent
,
731 static loff_t
max_file_size(unsigned bits
)
733 loff_t result
= (DEF_ADDRS_PER_INODE
- F2FS_INLINE_XATTR_ADDRS
);
734 loff_t leaf_count
= ADDRS_PER_BLOCK
;
736 /* two direct node blocks */
737 result
+= (leaf_count
* 2);
739 /* two indirect node blocks */
740 leaf_count
*= NIDS_PER_BLOCK
;
741 result
+= (leaf_count
* 2);
743 /* one double indirect node block */
744 leaf_count
*= NIDS_PER_BLOCK
;
745 result
+= leaf_count
;
751 static int sanity_check_raw_super(struct super_block
*sb
,
752 struct f2fs_super_block
*raw_super
)
754 unsigned int blocksize
;
756 if (F2FS_SUPER_MAGIC
!= le32_to_cpu(raw_super
->magic
)) {
757 f2fs_msg(sb
, KERN_INFO
,
758 "Magic Mismatch, valid(0x%x) - read(0x%x)",
759 F2FS_SUPER_MAGIC
, le32_to_cpu(raw_super
->magic
));
763 /* Currently, support only 4KB page cache size */
764 if (F2FS_BLKSIZE
!= PAGE_CACHE_SIZE
) {
765 f2fs_msg(sb
, KERN_INFO
,
766 "Invalid page_cache_size (%lu), supports only 4KB\n",
771 /* Currently, support only 4KB block size */
772 blocksize
= 1 << le32_to_cpu(raw_super
->log_blocksize
);
773 if (blocksize
!= F2FS_BLKSIZE
) {
774 f2fs_msg(sb
, KERN_INFO
,
775 "Invalid blocksize (%u), supports only 4KB\n",
780 if (le32_to_cpu(raw_super
->log_sectorsize
) !=
781 F2FS_LOG_SECTOR_SIZE
) {
782 f2fs_msg(sb
, KERN_INFO
, "Invalid log sectorsize");
785 if (le32_to_cpu(raw_super
->log_sectors_per_block
) !=
786 F2FS_LOG_SECTORS_PER_BLOCK
) {
787 f2fs_msg(sb
, KERN_INFO
, "Invalid log sectors per block");
793 static int sanity_check_ckpt(struct f2fs_sb_info
*sbi
)
795 unsigned int total
, fsmeta
;
796 struct f2fs_super_block
*raw_super
= F2FS_RAW_SUPER(sbi
);
797 struct f2fs_checkpoint
*ckpt
= F2FS_CKPT(sbi
);
799 total
= le32_to_cpu(raw_super
->segment_count
);
800 fsmeta
= le32_to_cpu(raw_super
->segment_count_ckpt
);
801 fsmeta
+= le32_to_cpu(raw_super
->segment_count_sit
);
802 fsmeta
+= le32_to_cpu(raw_super
->segment_count_nat
);
803 fsmeta
+= le32_to_cpu(ckpt
->rsvd_segment_count
);
804 fsmeta
+= le32_to_cpu(raw_super
->segment_count_ssa
);
806 if (unlikely(fsmeta
>= total
))
809 if (unlikely(is_set_ckpt_flags(ckpt
, CP_ERROR_FLAG
))) {
810 f2fs_msg(sbi
->sb
, KERN_ERR
, "A bug case: need to run fsck");
816 static void init_sb_info(struct f2fs_sb_info
*sbi
)
818 struct f2fs_super_block
*raw_super
= sbi
->raw_super
;
821 sbi
->log_sectors_per_block
=
822 le32_to_cpu(raw_super
->log_sectors_per_block
);
823 sbi
->log_blocksize
= le32_to_cpu(raw_super
->log_blocksize
);
824 sbi
->blocksize
= 1 << sbi
->log_blocksize
;
825 sbi
->log_blocks_per_seg
= le32_to_cpu(raw_super
->log_blocks_per_seg
);
826 sbi
->blocks_per_seg
= 1 << sbi
->log_blocks_per_seg
;
827 sbi
->segs_per_sec
= le32_to_cpu(raw_super
->segs_per_sec
);
828 sbi
->secs_per_zone
= le32_to_cpu(raw_super
->secs_per_zone
);
829 sbi
->total_sections
= le32_to_cpu(raw_super
->section_count
);
830 sbi
->total_node_count
=
831 (le32_to_cpu(raw_super
->segment_count_nat
) / 2)
832 * sbi
->blocks_per_seg
* NAT_ENTRY_PER_BLOCK
;
833 sbi
->root_ino_num
= le32_to_cpu(raw_super
->root_ino
);
834 sbi
->node_ino_num
= le32_to_cpu(raw_super
->node_ino
);
835 sbi
->meta_ino_num
= le32_to_cpu(raw_super
->meta_ino
);
836 sbi
->cur_victim_sec
= NULL_SECNO
;
837 sbi
->max_victim_search
= DEF_MAX_VICTIM_SEARCH
;
839 for (i
= 0; i
< NR_COUNT_TYPE
; i
++)
840 atomic_set(&sbi
->nr_pages
[i
], 0);
842 sbi
->dir_level
= DEF_DIR_LEVEL
;
846 * Read f2fs raw super block.
847 * Because we have two copies of super block, so read the first one at first,
848 * if the first one is invalid, move to read the second one.
850 static int read_raw_super_block(struct super_block
*sb
,
851 struct f2fs_super_block
**raw_super
,
852 struct buffer_head
**raw_super_buf
)
857 *raw_super_buf
= sb_bread(sb
, block
);
858 if (!*raw_super_buf
) {
859 f2fs_msg(sb
, KERN_ERR
, "Unable to read %dth superblock",
869 *raw_super
= (struct f2fs_super_block
*)
870 ((char *)(*raw_super_buf
)->b_data
+ F2FS_SUPER_OFFSET
);
872 /* sanity checking of raw super */
873 if (sanity_check_raw_super(sb
, *raw_super
)) {
874 brelse(*raw_super_buf
);
875 f2fs_msg(sb
, KERN_ERR
,
876 "Can't find valid F2FS filesystem in %dth superblock",
889 static int f2fs_fill_super(struct super_block
*sb
, void *data
, int silent
)
891 struct f2fs_sb_info
*sbi
;
892 struct f2fs_super_block
*raw_super
;
893 struct buffer_head
*raw_super_buf
;
898 /* allocate memory for f2fs-specific super block info */
899 sbi
= kzalloc(sizeof(struct f2fs_sb_info
), GFP_KERNEL
);
903 /* set a block size */
904 if (unlikely(!sb_set_blocksize(sb
, F2FS_BLKSIZE
))) {
905 f2fs_msg(sb
, KERN_ERR
, "unable to set blocksize");
909 err
= read_raw_super_block(sb
, &raw_super
, &raw_super_buf
);
914 /* init some FS parameters */
915 sbi
->active_logs
= NR_CURSEG_TYPE
;
919 #ifdef CONFIG_F2FS_FS_XATTR
920 set_opt(sbi
, XATTR_USER
);
922 #ifdef CONFIG_F2FS_FS_POSIX_ACL
923 set_opt(sbi
, POSIX_ACL
);
925 /* parse mount options */
926 err
= parse_options(sb
, (char *)data
);
930 sb
->s_maxbytes
= max_file_size(le32_to_cpu(raw_super
->log_blocksize
));
931 sb
->s_max_links
= F2FS_LINK_MAX
;
932 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
934 sb
->s_op
= &f2fs_sops
;
935 sb
->s_xattr
= f2fs_xattr_handlers
;
936 sb
->s_export_op
= &f2fs_export_ops
;
937 sb
->s_magic
= F2FS_SUPER_MAGIC
;
939 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
940 (test_opt(sbi
, POSIX_ACL
) ? MS_POSIXACL
: 0);
941 memcpy(sb
->s_uuid
, raw_super
->uuid
, sizeof(raw_super
->uuid
));
943 /* init f2fs-specific super block info */
945 sbi
->raw_super
= raw_super
;
946 sbi
->raw_super_buf
= raw_super_buf
;
947 mutex_init(&sbi
->gc_mutex
);
948 mutex_init(&sbi
->writepages
);
949 mutex_init(&sbi
->cp_mutex
);
950 mutex_init(&sbi
->node_write
);
951 sbi
->por_doing
= false;
952 spin_lock_init(&sbi
->stat_lock
);
954 init_rwsem(&sbi
->read_io
.io_rwsem
);
955 sbi
->read_io
.sbi
= sbi
;
956 sbi
->read_io
.bio
= NULL
;
957 for (i
= 0; i
< NR_PAGE_TYPE
; i
++) {
958 init_rwsem(&sbi
->write_io
[i
].io_rwsem
);
959 sbi
->write_io
[i
].sbi
= sbi
;
960 sbi
->write_io
[i
].bio
= NULL
;
963 init_rwsem(&sbi
->cp_rwsem
);
964 init_waitqueue_head(&sbi
->cp_wait
);
967 /* get an inode for meta space */
968 sbi
->meta_inode
= f2fs_iget(sb
, F2FS_META_INO(sbi
));
969 if (IS_ERR(sbi
->meta_inode
)) {
970 f2fs_msg(sb
, KERN_ERR
, "Failed to read F2FS meta data inode");
971 err
= PTR_ERR(sbi
->meta_inode
);
975 err
= get_valid_checkpoint(sbi
);
977 f2fs_msg(sb
, KERN_ERR
, "Failed to get valid F2FS checkpoint");
978 goto free_meta_inode
;
981 /* sanity checking of checkpoint */
983 if (sanity_check_ckpt(sbi
)) {
984 f2fs_msg(sb
, KERN_ERR
, "Invalid F2FS checkpoint");
988 sbi
->total_valid_node_count
=
989 le32_to_cpu(sbi
->ckpt
->valid_node_count
);
990 sbi
->total_valid_inode_count
=
991 le32_to_cpu(sbi
->ckpt
->valid_inode_count
);
992 sbi
->user_block_count
= le64_to_cpu(sbi
->ckpt
->user_block_count
);
993 sbi
->total_valid_block_count
=
994 le64_to_cpu(sbi
->ckpt
->valid_block_count
);
995 sbi
->last_valid_block_count
= sbi
->total_valid_block_count
;
996 sbi
->alloc_valid_block_count
= 0;
997 INIT_LIST_HEAD(&sbi
->dir_inode_list
);
998 spin_lock_init(&sbi
->dir_inode_lock
);
1000 init_orphan_info(sbi
);
1002 /* setup f2fs internal modules */
1003 err
= build_segment_manager(sbi
);
1005 f2fs_msg(sb
, KERN_ERR
,
1006 "Failed to initialize F2FS segment manager");
1009 err
= build_node_manager(sbi
);
1011 f2fs_msg(sb
, KERN_ERR
,
1012 "Failed to initialize F2FS node manager");
1016 build_gc_manager(sbi
);
1018 /* get an inode for node space */
1019 sbi
->node_inode
= f2fs_iget(sb
, F2FS_NODE_INO(sbi
));
1020 if (IS_ERR(sbi
->node_inode
)) {
1021 f2fs_msg(sb
, KERN_ERR
, "Failed to read node inode");
1022 err
= PTR_ERR(sbi
->node_inode
);
1026 /* if there are nt orphan nodes free them */
1027 recover_orphan_inodes(sbi
);
1029 /* read root inode and dentry */
1030 root
= f2fs_iget(sb
, F2FS_ROOT_INO(sbi
));
1032 f2fs_msg(sb
, KERN_ERR
, "Failed to read root inode");
1033 err
= PTR_ERR(root
);
1034 goto free_node_inode
;
1036 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
1038 goto free_root_inode
;
1041 sb
->s_root
= d_make_root(root
); /* allocate root dentry */
1044 goto free_root_inode
;
1047 err
= f2fs_build_stats(sbi
);
1049 goto free_root_inode
;
1052 sbi
->s_proc
= proc_mkdir(sb
->s_id
, f2fs_proc_root
);
1055 proc_create_data("segment_info", S_IRUGO
, sbi
->s_proc
,
1056 &f2fs_seq_segment_info_fops
, sb
);
1058 if (test_opt(sbi
, DISCARD
)) {
1059 struct request_queue
*q
= bdev_get_queue(sb
->s_bdev
);
1060 if (!blk_queue_discard(q
))
1061 f2fs_msg(sb
, KERN_WARNING
,
1062 "mounting with \"discard\" option, but "
1063 "the device does not support discard");
1066 sbi
->s_kobj
.kset
= f2fs_kset
;
1067 init_completion(&sbi
->s_kobj_unregister
);
1068 err
= kobject_init_and_add(&sbi
->s_kobj
, &f2fs_ktype
, NULL
,
1073 /* recover fsynced data */
1074 if (!test_opt(sbi
, DISABLE_ROLL_FORWARD
)) {
1075 err
= recover_fsync_data(sbi
);
1077 f2fs_msg(sb
, KERN_ERR
,
1078 "Cannot recover all fsync data errno=%ld", err
);
1082 * If filesystem is not mounted as read-only then
1083 * do start the gc_thread.
1085 if (!(sb
->s_flags
& MS_RDONLY
)) {
1086 /* After POR, we can run background GC thread.*/
1087 err
= start_gc_thread(sbi
);
1094 kobject_del(&sbi
->s_kobj
);
1097 remove_proc_entry("segment_info", sbi
->s_proc
);
1098 remove_proc_entry(sb
->s_id
, f2fs_proc_root
);
1100 f2fs_destroy_stats(sbi
);
1105 iput(sbi
->node_inode
);
1107 destroy_node_manager(sbi
);
1109 destroy_segment_manager(sbi
);
1113 make_bad_inode(sbi
->meta_inode
);
1114 iput(sbi
->meta_inode
);
1116 brelse(raw_super_buf
);
1122 static struct dentry
*f2fs_mount(struct file_system_type
*fs_type
, int flags
,
1123 const char *dev_name
, void *data
)
1125 return mount_bdev(fs_type
, flags
, dev_name
, data
, f2fs_fill_super
);
1128 static struct file_system_type f2fs_fs_type
= {
1129 .owner
= THIS_MODULE
,
1131 .mount
= f2fs_mount
,
1132 .kill_sb
= kill_block_super
,
1133 .fs_flags
= FS_REQUIRES_DEV
,
1135 MODULE_ALIAS_FS("f2fs");
1137 static int __init
init_inodecache(void)
1139 f2fs_inode_cachep
= f2fs_kmem_cache_create("f2fs_inode_cache",
1140 sizeof(struct f2fs_inode_info
));
1141 if (!f2fs_inode_cachep
)
1146 static void destroy_inodecache(void)
1149 * Make sure all delayed rcu free inodes are flushed before we
1153 kmem_cache_destroy(f2fs_inode_cachep
);
1156 static int __init
init_f2fs_fs(void)
1160 err
= init_inodecache();
1163 err
= create_node_manager_caches();
1165 goto free_inodecache
;
1166 err
= create_segment_manager_caches();
1168 goto free_node_manager_caches
;
1169 err
= create_gc_caches();
1171 goto free_segment_manager_caches
;
1172 err
= create_checkpoint_caches();
1174 goto free_gc_caches
;
1175 f2fs_kset
= kset_create_and_add("f2fs", NULL
, fs_kobj
);
1178 goto free_checkpoint_caches
;
1180 err
= register_filesystem(&f2fs_fs_type
);
1183 f2fs_create_root_stats();
1184 f2fs_proc_root
= proc_mkdir("fs/f2fs", NULL
);
1188 kset_unregister(f2fs_kset
);
1189 free_checkpoint_caches
:
1190 destroy_checkpoint_caches();
1192 destroy_gc_caches();
1193 free_segment_manager_caches
:
1194 destroy_segment_manager_caches();
1195 free_node_manager_caches
:
1196 destroy_node_manager_caches();
1198 destroy_inodecache();
1203 static void __exit
exit_f2fs_fs(void)
1205 remove_proc_entry("fs/f2fs", NULL
);
1206 f2fs_destroy_root_stats();
1207 unregister_filesystem(&f2fs_fs_type
);
1208 destroy_checkpoint_caches();
1209 destroy_gc_caches();
1210 destroy_segment_manager_caches();
1211 destroy_node_manager_caches();
1212 destroy_inodecache();
1213 kset_unregister(f2fs_kset
);
1216 module_init(init_f2fs_fs
)
1217 module_exit(exit_f2fs_fs
)
1219 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1220 MODULE_DESCRIPTION("Flash Friendly File System");
1221 MODULE_LICENSE("GPL");