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
,
56 static match_table_t f2fs_tokens
= {
57 {Opt_gc_background
, "background_gc=%s"},
58 {Opt_disable_roll_forward
, "disable_roll_forward"},
59 {Opt_discard
, "discard"},
60 {Opt_noheap
, "no_heap"},
61 {Opt_user_xattr
, "user_xattr"},
62 {Opt_nouser_xattr
, "nouser_xattr"},
65 {Opt_active_logs
, "active_logs=%u"},
66 {Opt_disable_ext_identify
, "disable_ext_identify"},
67 {Opt_inline_xattr
, "inline_xattr"},
71 /* Sysfs support for f2fs */
73 GC_THREAD
, /* struct f2fs_gc_thread */
74 SM_INFO
, /* struct f2fs_sm_info */
78 struct attribute attr
;
79 ssize_t (*show
)(struct f2fs_attr
*, struct f2fs_sb_info
*, char *);
80 ssize_t (*store
)(struct f2fs_attr
*, struct f2fs_sb_info
*,
81 const char *, size_t);
86 static unsigned char *__struct_ptr(struct f2fs_sb_info
*sbi
, int struct_type
)
88 if (struct_type
== GC_THREAD
)
89 return (unsigned char *)sbi
->gc_thread
;
90 else if (struct_type
== SM_INFO
)
91 return (unsigned char *)SM_I(sbi
);
95 static ssize_t
f2fs_sbi_show(struct f2fs_attr
*a
,
96 struct f2fs_sb_info
*sbi
, char *buf
)
98 unsigned char *ptr
= NULL
;
101 ptr
= __struct_ptr(sbi
, a
->struct_type
);
105 ui
= (unsigned int *)(ptr
+ a
->offset
);
107 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
110 static ssize_t
f2fs_sbi_store(struct f2fs_attr
*a
,
111 struct f2fs_sb_info
*sbi
,
112 const char *buf
, size_t count
)
119 ptr
= __struct_ptr(sbi
, a
->struct_type
);
123 ui
= (unsigned int *)(ptr
+ a
->offset
);
125 ret
= kstrtoul(skip_spaces(buf
), 0, &t
);
132 static ssize_t
f2fs_attr_show(struct kobject
*kobj
,
133 struct attribute
*attr
, char *buf
)
135 struct f2fs_sb_info
*sbi
= container_of(kobj
, struct f2fs_sb_info
,
137 struct f2fs_attr
*a
= container_of(attr
, struct f2fs_attr
, attr
);
139 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
142 static ssize_t
f2fs_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
143 const char *buf
, size_t len
)
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
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
152 static void f2fs_sb_release(struct kobject
*kobj
)
154 struct f2fs_sb_info
*sbi
= container_of(kobj
, struct f2fs_sb_info
,
156 complete(&sbi
->s_kobj_unregister
);
159 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
160 static struct f2fs_attr f2fs_attr_##_name = { \
161 .attr = {.name = __stringify(_name), .mode = _mode }, \
164 .struct_type = _struct_type, \
168 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \
169 F2FS_ATTR_OFFSET(struct_type, name, 0644, \
170 f2fs_sbi_show, f2fs_sbi_store, \
171 offsetof(struct struct_name, elname))
173 F2FS_RW_ATTR(GC_THREAD
, f2fs_gc_kthread
, gc_min_sleep_time
, min_sleep_time
);
174 F2FS_RW_ATTR(GC_THREAD
, f2fs_gc_kthread
, gc_max_sleep_time
, max_sleep_time
);
175 F2FS_RW_ATTR(GC_THREAD
, f2fs_gc_kthread
, gc_no_gc_sleep_time
, no_gc_sleep_time
);
176 F2FS_RW_ATTR(GC_THREAD
, f2fs_gc_kthread
, gc_idle
, gc_idle
);
177 F2FS_RW_ATTR(SM_INFO
, f2fs_sm_info
, reclaim_segments
, rec_prefree_segments
);
179 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
180 static struct attribute
*f2fs_attrs
[] = {
181 ATTR_LIST(gc_min_sleep_time
),
182 ATTR_LIST(gc_max_sleep_time
),
183 ATTR_LIST(gc_no_gc_sleep_time
),
185 ATTR_LIST(reclaim_segments
),
189 static const struct sysfs_ops f2fs_attr_ops
= {
190 .show
= f2fs_attr_show
,
191 .store
= f2fs_attr_store
,
194 static struct kobj_type f2fs_ktype
= {
195 .default_attrs
= f2fs_attrs
,
196 .sysfs_ops
= &f2fs_attr_ops
,
197 .release
= f2fs_sb_release
,
200 void f2fs_msg(struct super_block
*sb
, const char *level
, const char *fmt
, ...)
202 struct va_format vaf
;
208 printk("%sF2FS-fs (%s): %pV\n", level
, sb
->s_id
, &vaf
);
212 static void init_once(void *foo
)
214 struct f2fs_inode_info
*fi
= (struct f2fs_inode_info
*) foo
;
216 inode_init_once(&fi
->vfs_inode
);
219 static int parse_options(struct super_block
*sb
, char *options
)
221 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
222 substring_t args
[MAX_OPT_ARGS
];
229 while ((p
= strsep(&options
, ",")) != NULL
) {
234 * Initialize args struct so we know whether arg was
235 * found; some options take optional arguments.
237 args
[0].to
= args
[0].from
= NULL
;
238 token
= match_token(p
, f2fs_tokens
, args
);
241 case Opt_gc_background
:
242 name
= match_strdup(&args
[0]);
246 if (!strncmp(name
, "on", 2))
248 else if (!strncmp(name
, "off", 3))
249 clear_opt(sbi
, BG_GC
);
256 case Opt_disable_roll_forward
:
257 set_opt(sbi
, DISABLE_ROLL_FORWARD
);
260 set_opt(sbi
, DISCARD
);
263 set_opt(sbi
, NOHEAP
);
265 #ifdef CONFIG_F2FS_FS_XATTR
267 set_opt(sbi
, XATTR_USER
);
269 case Opt_nouser_xattr
:
270 clear_opt(sbi
, XATTR_USER
);
272 case Opt_inline_xattr
:
273 set_opt(sbi
, INLINE_XATTR
);
277 f2fs_msg(sb
, KERN_INFO
,
278 "user_xattr options not supported");
280 case Opt_nouser_xattr
:
281 f2fs_msg(sb
, KERN_INFO
,
282 "nouser_xattr options not supported");
284 case Opt_inline_xattr
:
285 f2fs_msg(sb
, KERN_INFO
,
286 "inline_xattr options not supported");
289 #ifdef CONFIG_F2FS_FS_POSIX_ACL
291 set_opt(sbi
, POSIX_ACL
);
294 clear_opt(sbi
, POSIX_ACL
);
298 f2fs_msg(sb
, KERN_INFO
, "acl options not supported");
301 f2fs_msg(sb
, KERN_INFO
, "noacl options not supported");
304 case Opt_active_logs
:
305 if (args
->from
&& match_int(args
, &arg
))
307 if (arg
!= 2 && arg
!= 4 && arg
!= NR_CURSEG_TYPE
)
309 sbi
->active_logs
= arg
;
311 case Opt_disable_ext_identify
:
312 set_opt(sbi
, DISABLE_EXT_IDENTIFY
);
315 f2fs_msg(sb
, KERN_ERR
,
316 "Unrecognized mount option \"%s\" or missing value",
324 static struct inode
*f2fs_alloc_inode(struct super_block
*sb
)
326 struct f2fs_inode_info
*fi
;
328 fi
= kmem_cache_alloc(f2fs_inode_cachep
, GFP_NOFS
| __GFP_ZERO
);
332 init_once((void *) fi
);
334 /* Initialize f2fs-specific inode info */
335 fi
->vfs_inode
.i_version
= 1;
336 atomic_set(&fi
->dirty_dents
, 0);
337 fi
->i_current_depth
= 1;
339 rwlock_init(&fi
->ext
.ext_lock
);
341 set_inode_flag(fi
, FI_NEW_INODE
);
343 if (test_opt(F2FS_SB(sb
), INLINE_XATTR
))
344 set_inode_flag(fi
, FI_INLINE_XATTR
);
346 return &fi
->vfs_inode
;
349 static int f2fs_drop_inode(struct inode
*inode
)
352 * This is to avoid a deadlock condition like below.
353 * writeback_single_inode(inode)
354 * - f2fs_write_data_page
355 * - f2fs_gc -> iput -> evict
356 * - inode_wait_for_writeback(inode)
358 if (!inode_unhashed(inode
) && inode
->i_state
& I_SYNC
)
360 return generic_drop_inode(inode
);
364 * f2fs_dirty_inode() is called from __mark_inode_dirty()
366 * We should call set_dirty_inode to write the dirty inode through write_inode.
368 static void f2fs_dirty_inode(struct inode
*inode
, int flags
)
370 set_inode_flag(F2FS_I(inode
), FI_DIRTY_INODE
);
373 static void f2fs_i_callback(struct rcu_head
*head
)
375 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
376 kmem_cache_free(f2fs_inode_cachep
, F2FS_I(inode
));
379 static void f2fs_destroy_inode(struct inode
*inode
)
381 call_rcu(&inode
->i_rcu
, f2fs_i_callback
);
384 static void f2fs_put_super(struct super_block
*sb
)
386 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
389 remove_proc_entry("segment_info", sbi
->s_proc
);
390 remove_proc_entry(sb
->s_id
, f2fs_proc_root
);
392 kobject_del(&sbi
->s_kobj
);
394 f2fs_destroy_stats(sbi
);
397 /* We don't need to do checkpoint when it's clean */
398 if (sbi
->s_dirty
&& get_pages(sbi
, F2FS_DIRTY_NODES
))
399 write_checkpoint(sbi
, true);
401 iput(sbi
->node_inode
);
402 iput(sbi
->meta_inode
);
404 /* destroy f2fs internal modules */
405 destroy_node_manager(sbi
);
406 destroy_segment_manager(sbi
);
409 kobject_put(&sbi
->s_kobj
);
410 wait_for_completion(&sbi
->s_kobj_unregister
);
412 sb
->s_fs_info
= NULL
;
413 brelse(sbi
->raw_super_buf
);
417 int f2fs_sync_fs(struct super_block
*sb
, int sync
)
419 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
421 trace_f2fs_sync_fs(sb
, sync
);
423 if (!sbi
->s_dirty
&& !get_pages(sbi
, F2FS_DIRTY_NODES
))
427 mutex_lock(&sbi
->gc_mutex
);
428 write_checkpoint(sbi
, false);
429 mutex_unlock(&sbi
->gc_mutex
);
431 f2fs_balance_fs(sbi
);
437 static int f2fs_freeze(struct super_block
*sb
)
441 if (f2fs_readonly(sb
))
444 err
= f2fs_sync_fs(sb
, 1);
448 static int f2fs_unfreeze(struct super_block
*sb
)
453 static int f2fs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
455 struct super_block
*sb
= dentry
->d_sb
;
456 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
457 u64 id
= huge_encode_dev(sb
->s_bdev
->bd_dev
);
458 block_t total_count
, user_block_count
, start_count
, ovp_count
;
460 total_count
= le64_to_cpu(sbi
->raw_super
->block_count
);
461 user_block_count
= sbi
->user_block_count
;
462 start_count
= le32_to_cpu(sbi
->raw_super
->segment0_blkaddr
);
463 ovp_count
= SM_I(sbi
)->ovp_segments
<< sbi
->log_blocks_per_seg
;
464 buf
->f_type
= F2FS_SUPER_MAGIC
;
465 buf
->f_bsize
= sbi
->blocksize
;
467 buf
->f_blocks
= total_count
- start_count
;
468 buf
->f_bfree
= buf
->f_blocks
- valid_user_blocks(sbi
) - ovp_count
;
469 buf
->f_bavail
= user_block_count
- valid_user_blocks(sbi
);
471 buf
->f_files
= sbi
->total_node_count
;
472 buf
->f_ffree
= sbi
->total_node_count
- valid_inode_count(sbi
);
474 buf
->f_namelen
= F2FS_NAME_LEN
;
475 buf
->f_fsid
.val
[0] = (u32
)id
;
476 buf
->f_fsid
.val
[1] = (u32
)(id
>> 32);
481 static int f2fs_show_options(struct seq_file
*seq
, struct dentry
*root
)
483 struct f2fs_sb_info
*sbi
= F2FS_SB(root
->d_sb
);
485 if (!(root
->d_sb
->s_flags
& MS_RDONLY
) && test_opt(sbi
, BG_GC
))
486 seq_printf(seq
, ",background_gc=%s", "on");
488 seq_printf(seq
, ",background_gc=%s", "off");
489 if (test_opt(sbi
, DISABLE_ROLL_FORWARD
))
490 seq_puts(seq
, ",disable_roll_forward");
491 if (test_opt(sbi
, DISCARD
))
492 seq_puts(seq
, ",discard");
493 if (test_opt(sbi
, NOHEAP
))
494 seq_puts(seq
, ",no_heap_alloc");
495 #ifdef CONFIG_F2FS_FS_XATTR
496 if (test_opt(sbi
, XATTR_USER
))
497 seq_puts(seq
, ",user_xattr");
499 seq_puts(seq
, ",nouser_xattr");
500 if (test_opt(sbi
, INLINE_XATTR
))
501 seq_puts(seq
, ",inline_xattr");
503 #ifdef CONFIG_F2FS_FS_POSIX_ACL
504 if (test_opt(sbi
, POSIX_ACL
))
505 seq_puts(seq
, ",acl");
507 seq_puts(seq
, ",noacl");
509 if (test_opt(sbi
, DISABLE_EXT_IDENTIFY
))
510 seq_puts(seq
, ",disable_ext_identify");
512 seq_printf(seq
, ",active_logs=%u", sbi
->active_logs
);
517 static int segment_info_seq_show(struct seq_file
*seq
, void *offset
)
519 struct super_block
*sb
= seq
->private;
520 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
521 unsigned int total_segs
= le32_to_cpu(sbi
->raw_super
->segment_count_main
);
524 for (i
= 0; i
< total_segs
; i
++) {
525 seq_printf(seq
, "%u", get_valid_blocks(sbi
, i
, 1));
526 if (i
!= 0 && (i
% 10) == 0)
534 static int segment_info_open_fs(struct inode
*inode
, struct file
*file
)
536 return single_open(file
, segment_info_seq_show
, PDE_DATA(inode
));
539 static const struct file_operations f2fs_seq_segment_info_fops
= {
540 .owner
= THIS_MODULE
,
541 .open
= segment_info_open_fs
,
544 .release
= single_release
,
547 static int f2fs_remount(struct super_block
*sb
, int *flags
, char *data
)
549 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
550 struct f2fs_mount_info org_mount_opt
;
551 int err
, active_logs
;
554 * Save the old mount options in case we
555 * need to restore them.
557 org_mount_opt
= sbi
->mount_opt
;
558 active_logs
= sbi
->active_logs
;
560 /* parse mount options */
561 err
= parse_options(sb
, data
);
566 * Previous and new state of filesystem is RO,
567 * so no point in checking GC conditions.
569 if ((sb
->s_flags
& MS_RDONLY
) && (*flags
& MS_RDONLY
))
573 * We stop the GC thread if FS is mounted as RO
574 * or if background_gc = off is passed in mount
575 * option. Also sync the filesystem.
577 if ((*flags
& MS_RDONLY
) || !test_opt(sbi
, BG_GC
)) {
578 if (sbi
->gc_thread
) {
582 } else if (test_opt(sbi
, BG_GC
) && !sbi
->gc_thread
) {
583 err
= start_gc_thread(sbi
);
588 /* Update the POSIXACL Flag */
589 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
590 (test_opt(sbi
, POSIX_ACL
) ? MS_POSIXACL
: 0);
594 sbi
->mount_opt
= org_mount_opt
;
595 sbi
->active_logs
= active_logs
;
599 static struct super_operations f2fs_sops
= {
600 .alloc_inode
= f2fs_alloc_inode
,
601 .drop_inode
= f2fs_drop_inode
,
602 .destroy_inode
= f2fs_destroy_inode
,
603 .write_inode
= f2fs_write_inode
,
604 .dirty_inode
= f2fs_dirty_inode
,
605 .show_options
= f2fs_show_options
,
606 .evict_inode
= f2fs_evict_inode
,
607 .put_super
= f2fs_put_super
,
608 .sync_fs
= f2fs_sync_fs
,
609 .freeze_fs
= f2fs_freeze
,
610 .unfreeze_fs
= f2fs_unfreeze
,
611 .statfs
= f2fs_statfs
,
612 .remount_fs
= f2fs_remount
,
615 static struct inode
*f2fs_nfs_get_inode(struct super_block
*sb
,
616 u64 ino
, u32 generation
)
618 struct f2fs_sb_info
*sbi
= F2FS_SB(sb
);
621 if (ino
< F2FS_ROOT_INO(sbi
))
622 return ERR_PTR(-ESTALE
);
625 * f2fs_iget isn't quite right if the inode is currently unallocated!
626 * However f2fs_iget currently does appropriate checks to handle stale
627 * inodes so everything is OK.
629 inode
= f2fs_iget(sb
, ino
);
631 return ERR_CAST(inode
);
632 if (generation
&& inode
->i_generation
!= generation
) {
633 /* we didn't find the right inode.. */
635 return ERR_PTR(-ESTALE
);
640 static struct dentry
*f2fs_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
641 int fh_len
, int fh_type
)
643 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
647 static struct dentry
*f2fs_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
648 int fh_len
, int fh_type
)
650 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
654 static const struct export_operations f2fs_export_ops
= {
655 .fh_to_dentry
= f2fs_fh_to_dentry
,
656 .fh_to_parent
= f2fs_fh_to_parent
,
657 .get_parent
= f2fs_get_parent
,
660 static loff_t
max_file_size(unsigned bits
)
662 loff_t result
= (DEF_ADDRS_PER_INODE
- F2FS_INLINE_XATTR_ADDRS
);
663 loff_t leaf_count
= ADDRS_PER_BLOCK
;
665 /* two direct node blocks */
666 result
+= (leaf_count
* 2);
668 /* two indirect node blocks */
669 leaf_count
*= NIDS_PER_BLOCK
;
670 result
+= (leaf_count
* 2);
672 /* one double indirect node block */
673 leaf_count
*= NIDS_PER_BLOCK
;
674 result
+= leaf_count
;
680 static int sanity_check_raw_super(struct super_block
*sb
,
681 struct f2fs_super_block
*raw_super
)
683 unsigned int blocksize
;
685 if (F2FS_SUPER_MAGIC
!= le32_to_cpu(raw_super
->magic
)) {
686 f2fs_msg(sb
, KERN_INFO
,
687 "Magic Mismatch, valid(0x%x) - read(0x%x)",
688 F2FS_SUPER_MAGIC
, le32_to_cpu(raw_super
->magic
));
692 /* Currently, support only 4KB page cache size */
693 if (F2FS_BLKSIZE
!= PAGE_CACHE_SIZE
) {
694 f2fs_msg(sb
, KERN_INFO
,
695 "Invalid page_cache_size (%lu), supports only 4KB\n",
700 /* Currently, support only 4KB block size */
701 blocksize
= 1 << le32_to_cpu(raw_super
->log_blocksize
);
702 if (blocksize
!= F2FS_BLKSIZE
) {
703 f2fs_msg(sb
, KERN_INFO
,
704 "Invalid blocksize (%u), supports only 4KB\n",
709 if (le32_to_cpu(raw_super
->log_sectorsize
) !=
710 F2FS_LOG_SECTOR_SIZE
) {
711 f2fs_msg(sb
, KERN_INFO
, "Invalid log sectorsize");
714 if (le32_to_cpu(raw_super
->log_sectors_per_block
) !=
715 F2FS_LOG_SECTORS_PER_BLOCK
) {
716 f2fs_msg(sb
, KERN_INFO
, "Invalid log sectors per block");
722 static int sanity_check_ckpt(struct f2fs_sb_info
*sbi
)
724 unsigned int total
, fsmeta
;
725 struct f2fs_super_block
*raw_super
= F2FS_RAW_SUPER(sbi
);
726 struct f2fs_checkpoint
*ckpt
= F2FS_CKPT(sbi
);
728 total
= le32_to_cpu(raw_super
->segment_count
);
729 fsmeta
= le32_to_cpu(raw_super
->segment_count_ckpt
);
730 fsmeta
+= le32_to_cpu(raw_super
->segment_count_sit
);
731 fsmeta
+= le32_to_cpu(raw_super
->segment_count_nat
);
732 fsmeta
+= le32_to_cpu(ckpt
->rsvd_segment_count
);
733 fsmeta
+= le32_to_cpu(raw_super
->segment_count_ssa
);
738 if (is_set_ckpt_flags(ckpt
, CP_ERROR_FLAG
)) {
739 f2fs_msg(sbi
->sb
, KERN_ERR
, "A bug case: need to run fsck");
745 static void init_sb_info(struct f2fs_sb_info
*sbi
)
747 struct f2fs_super_block
*raw_super
= sbi
->raw_super
;
750 sbi
->log_sectors_per_block
=
751 le32_to_cpu(raw_super
->log_sectors_per_block
);
752 sbi
->log_blocksize
= le32_to_cpu(raw_super
->log_blocksize
);
753 sbi
->blocksize
= 1 << sbi
->log_blocksize
;
754 sbi
->log_blocks_per_seg
= le32_to_cpu(raw_super
->log_blocks_per_seg
);
755 sbi
->blocks_per_seg
= 1 << sbi
->log_blocks_per_seg
;
756 sbi
->segs_per_sec
= le32_to_cpu(raw_super
->segs_per_sec
);
757 sbi
->secs_per_zone
= le32_to_cpu(raw_super
->secs_per_zone
);
758 sbi
->total_sections
= le32_to_cpu(raw_super
->section_count
);
759 sbi
->total_node_count
=
760 (le32_to_cpu(raw_super
->segment_count_nat
) / 2)
761 * sbi
->blocks_per_seg
* NAT_ENTRY_PER_BLOCK
;
762 sbi
->root_ino_num
= le32_to_cpu(raw_super
->root_ino
);
763 sbi
->node_ino_num
= le32_to_cpu(raw_super
->node_ino
);
764 sbi
->meta_ino_num
= le32_to_cpu(raw_super
->meta_ino
);
765 sbi
->cur_victim_sec
= NULL_SECNO
;
767 for (i
= 0; i
< NR_COUNT_TYPE
; i
++)
768 atomic_set(&sbi
->nr_pages
[i
], 0);
772 * Read f2fs raw super block.
773 * Because we have two copies of super block, so read the first one at first,
774 * if the first one is invalid, move to read the second one.
776 static int read_raw_super_block(struct super_block
*sb
,
777 struct f2fs_super_block
**raw_super
,
778 struct buffer_head
**raw_super_buf
)
783 *raw_super_buf
= sb_bread(sb
, block
);
784 if (!*raw_super_buf
) {
785 f2fs_msg(sb
, KERN_ERR
, "Unable to read %dth superblock",
795 *raw_super
= (struct f2fs_super_block
*)
796 ((char *)(*raw_super_buf
)->b_data
+ F2FS_SUPER_OFFSET
);
798 /* sanity checking of raw super */
799 if (sanity_check_raw_super(sb
, *raw_super
)) {
800 brelse(*raw_super_buf
);
801 f2fs_msg(sb
, KERN_ERR
, "Can't find a valid F2FS filesystem "
802 "in %dth superblock", block
+ 1);
814 static int f2fs_fill_super(struct super_block
*sb
, void *data
, int silent
)
816 struct f2fs_sb_info
*sbi
;
817 struct f2fs_super_block
*raw_super
;
818 struct buffer_head
*raw_super_buf
;
822 /* allocate memory for f2fs-specific super block info */
823 sbi
= kzalloc(sizeof(struct f2fs_sb_info
), GFP_KERNEL
);
827 /* set a block size */
828 if (!sb_set_blocksize(sb
, F2FS_BLKSIZE
)) {
829 f2fs_msg(sb
, KERN_ERR
, "unable to set blocksize");
833 err
= read_raw_super_block(sb
, &raw_super
, &raw_super_buf
);
838 /* init some FS parameters */
839 sbi
->active_logs
= NR_CURSEG_TYPE
;
843 #ifdef CONFIG_F2FS_FS_XATTR
844 set_opt(sbi
, XATTR_USER
);
846 #ifdef CONFIG_F2FS_FS_POSIX_ACL
847 set_opt(sbi
, POSIX_ACL
);
849 /* parse mount options */
850 err
= parse_options(sb
, (char *)data
);
854 sb
->s_maxbytes
= max_file_size(le32_to_cpu(raw_super
->log_blocksize
));
855 sb
->s_max_links
= F2FS_LINK_MAX
;
856 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
858 sb
->s_op
= &f2fs_sops
;
859 sb
->s_xattr
= f2fs_xattr_handlers
;
860 sb
->s_export_op
= &f2fs_export_ops
;
861 sb
->s_magic
= F2FS_SUPER_MAGIC
;
863 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
864 (test_opt(sbi
, POSIX_ACL
) ? MS_POSIXACL
: 0);
865 memcpy(sb
->s_uuid
, raw_super
->uuid
, sizeof(raw_super
->uuid
));
867 /* init f2fs-specific super block info */
869 sbi
->raw_super
= raw_super
;
870 sbi
->raw_super_buf
= raw_super_buf
;
871 mutex_init(&sbi
->gc_mutex
);
872 mutex_init(&sbi
->writepages
);
873 mutex_init(&sbi
->cp_mutex
);
874 mutex_init(&sbi
->node_write
);
875 sbi
->por_doing
= false;
876 spin_lock_init(&sbi
->stat_lock
);
877 init_rwsem(&sbi
->bio_sem
);
878 init_rwsem(&sbi
->cp_rwsem
);
879 init_waitqueue_head(&sbi
->cp_wait
);
882 /* get an inode for meta space */
883 sbi
->meta_inode
= f2fs_iget(sb
, F2FS_META_INO(sbi
));
884 if (IS_ERR(sbi
->meta_inode
)) {
885 f2fs_msg(sb
, KERN_ERR
, "Failed to read F2FS meta data inode");
886 err
= PTR_ERR(sbi
->meta_inode
);
890 err
= get_valid_checkpoint(sbi
);
892 f2fs_msg(sb
, KERN_ERR
, "Failed to get valid F2FS checkpoint");
893 goto free_meta_inode
;
896 /* sanity checking of checkpoint */
898 if (sanity_check_ckpt(sbi
)) {
899 f2fs_msg(sb
, KERN_ERR
, "Invalid F2FS checkpoint");
903 sbi
->total_valid_node_count
=
904 le32_to_cpu(sbi
->ckpt
->valid_node_count
);
905 sbi
->total_valid_inode_count
=
906 le32_to_cpu(sbi
->ckpt
->valid_inode_count
);
907 sbi
->user_block_count
= le64_to_cpu(sbi
->ckpt
->user_block_count
);
908 sbi
->total_valid_block_count
=
909 le64_to_cpu(sbi
->ckpt
->valid_block_count
);
910 sbi
->last_valid_block_count
= sbi
->total_valid_block_count
;
911 sbi
->alloc_valid_block_count
= 0;
912 INIT_LIST_HEAD(&sbi
->dir_inode_list
);
913 spin_lock_init(&sbi
->dir_inode_lock
);
915 init_orphan_info(sbi
);
917 /* setup f2fs internal modules */
918 err
= build_segment_manager(sbi
);
920 f2fs_msg(sb
, KERN_ERR
,
921 "Failed to initialize F2FS segment manager");
924 err
= build_node_manager(sbi
);
926 f2fs_msg(sb
, KERN_ERR
,
927 "Failed to initialize F2FS node manager");
931 build_gc_manager(sbi
);
933 /* get an inode for node space */
934 sbi
->node_inode
= f2fs_iget(sb
, F2FS_NODE_INO(sbi
));
935 if (IS_ERR(sbi
->node_inode
)) {
936 f2fs_msg(sb
, KERN_ERR
, "Failed to read node inode");
937 err
= PTR_ERR(sbi
->node_inode
);
941 /* if there are nt orphan nodes free them */
943 if (recover_orphan_inodes(sbi
))
944 goto free_node_inode
;
946 /* read root inode and dentry */
947 root
= f2fs_iget(sb
, F2FS_ROOT_INO(sbi
));
949 f2fs_msg(sb
, KERN_ERR
, "Failed to read root inode");
951 goto free_node_inode
;
953 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
)
954 goto free_root_inode
;
956 sb
->s_root
= d_make_root(root
); /* allocate root dentry */
959 goto free_root_inode
;
962 /* recover fsynced data */
963 if (!test_opt(sbi
, DISABLE_ROLL_FORWARD
)) {
964 err
= recover_fsync_data(sbi
);
966 f2fs_msg(sb
, KERN_ERR
,
967 "Cannot recover all fsync data errno=%ld", err
);
971 * If filesystem is not mounted as read-only then
972 * do start the gc_thread.
974 if (!(sb
->s_flags
& MS_RDONLY
)) {
975 /* After POR, we can run background GC thread.*/
976 err
= start_gc_thread(sbi
);
981 err
= f2fs_build_stats(sbi
);
986 sbi
->s_proc
= proc_mkdir(sb
->s_id
, f2fs_proc_root
);
989 proc_create_data("segment_info", S_IRUGO
, sbi
->s_proc
,
990 &f2fs_seq_segment_info_fops
, sb
);
992 if (test_opt(sbi
, DISCARD
)) {
993 struct request_queue
*q
= bdev_get_queue(sb
->s_bdev
);
994 if (!blk_queue_discard(q
))
995 f2fs_msg(sb
, KERN_WARNING
,
996 "mounting with \"discard\" option, but "
997 "the device does not support discard");
1000 sbi
->s_kobj
.kset
= f2fs_kset
;
1001 init_completion(&sbi
->s_kobj_unregister
);
1002 err
= kobject_init_and_add(&sbi
->s_kobj
, &f2fs_ktype
, NULL
,
1010 remove_proc_entry("segment_info", sbi
->s_proc
);
1011 remove_proc_entry(sb
->s_id
, f2fs_proc_root
);
1013 f2fs_destroy_stats(sbi
);
1015 stop_gc_thread(sbi
);
1020 iput(sbi
->node_inode
);
1022 destroy_node_manager(sbi
);
1024 destroy_segment_manager(sbi
);
1028 make_bad_inode(sbi
->meta_inode
);
1029 iput(sbi
->meta_inode
);
1031 brelse(raw_super_buf
);
1037 static struct dentry
*f2fs_mount(struct file_system_type
*fs_type
, int flags
,
1038 const char *dev_name
, void *data
)
1040 return mount_bdev(fs_type
, flags
, dev_name
, data
, f2fs_fill_super
);
1043 static struct file_system_type f2fs_fs_type
= {
1044 .owner
= THIS_MODULE
,
1046 .mount
= f2fs_mount
,
1047 .kill_sb
= kill_block_super
,
1048 .fs_flags
= FS_REQUIRES_DEV
,
1050 MODULE_ALIAS_FS("f2fs");
1052 static int __init
init_inodecache(void)
1054 f2fs_inode_cachep
= f2fs_kmem_cache_create("f2fs_inode_cache",
1055 sizeof(struct f2fs_inode_info
), NULL
);
1056 if (f2fs_inode_cachep
== NULL
)
1061 static void destroy_inodecache(void)
1064 * Make sure all delayed rcu free inodes are flushed before we
1068 kmem_cache_destroy(f2fs_inode_cachep
);
1071 static int __init
init_f2fs_fs(void)
1075 err
= init_inodecache();
1078 err
= create_node_manager_caches();
1080 goto free_inodecache
;
1081 err
= create_gc_caches();
1083 goto free_node_manager_caches
;
1084 err
= create_checkpoint_caches();
1086 goto free_gc_caches
;
1087 f2fs_kset
= kset_create_and_add("f2fs", NULL
, fs_kobj
);
1090 goto free_checkpoint_caches
;
1092 err
= register_filesystem(&f2fs_fs_type
);
1095 f2fs_create_root_stats();
1096 f2fs_proc_root
= proc_mkdir("fs/f2fs", NULL
);
1100 kset_unregister(f2fs_kset
);
1101 free_checkpoint_caches
:
1102 destroy_checkpoint_caches();
1104 destroy_gc_caches();
1105 free_node_manager_caches
:
1106 destroy_node_manager_caches();
1108 destroy_inodecache();
1113 static void __exit
exit_f2fs_fs(void)
1115 remove_proc_entry("fs/f2fs", NULL
);
1116 f2fs_destroy_root_stats();
1117 unregister_filesystem(&f2fs_fs_type
);
1118 destroy_checkpoint_caches();
1119 destroy_gc_caches();
1120 destroy_node_manager_caches();
1121 destroy_inodecache();
1122 kset_unregister(f2fs_kset
);
1125 module_init(init_f2fs_fs
)
1126 module_exit(exit_f2fs_fs
)
1128 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1129 MODULE_DESCRIPTION("Flash Friendly File System");
1130 MODULE_LICENSE("GPL");