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.
12 #include <linux/f2fs_fs.h>
13 #include <linux/stat.h>
14 #include <linux/buffer_head.h>
15 #include <linux/writeback.h>
16 #include <linux/falloc.h>
17 #include <linux/types.h>
18 #include <linux/compat.h>
19 #include <linux/uaccess.h>
20 #include <linux/mount.h>
28 static int f2fs_vm_page_mkwrite(struct vm_area_struct
*vma
,
31 struct page
*page
= vmf
->page
;
32 struct inode
*inode
= file_inode(vma
->vm_file
);
33 struct f2fs_sb_info
*sbi
= F2FS_SB(inode
->i_sb
);
35 struct dnode_of_data dn
;
40 sb_start_pagefault(inode
->i_sb
);
42 mutex_lock_op(sbi
, DATA_NEW
);
44 /* block allocation */
45 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
46 err
= get_dnode_of_data(&dn
, page
->index
, 0);
48 mutex_unlock_op(sbi
, DATA_NEW
);
52 old_blk_addr
= dn
.data_blkaddr
;
54 if (old_blk_addr
== NULL_ADDR
) {
55 err
= reserve_new_block(&dn
);
58 mutex_unlock_op(sbi
, DATA_NEW
);
64 mutex_unlock_op(sbi
, DATA_NEW
);
67 if (page
->mapping
!= inode
->i_mapping
||
68 page_offset(page
) >= i_size_read(inode
) ||
69 !PageUptodate(page
)) {
76 * check to see if the page is mapped already (no holes)
78 if (PageMappedToDisk(page
))
82 wait_on_page_writeback(page
);
84 /* page is wholly or partially inside EOF */
85 if (((page
->index
+ 1) << PAGE_CACHE_SHIFT
) > i_size_read(inode
)) {
87 offset
= i_size_read(inode
) & ~PAGE_CACHE_MASK
;
88 zero_user_segment(page
, offset
, PAGE_CACHE_SIZE
);
91 SetPageUptodate(page
);
93 file_update_time(vma
->vm_file
);
95 sb_end_pagefault(inode
->i_sb
);
96 return block_page_mkwrite_return(err
);
99 static const struct vm_operations_struct f2fs_file_vm_ops
= {
100 .fault
= filemap_fault
,
101 .page_mkwrite
= f2fs_vm_page_mkwrite
,
102 .remap_pages
= generic_file_remap_pages
,
105 static int need_to_sync_dir(struct f2fs_sb_info
*sbi
, struct inode
*inode
)
107 struct dentry
*dentry
;
110 inode
= igrab(inode
);
111 dentry
= d_find_any_alias(inode
);
116 pino
= dentry
->d_parent
->d_inode
->i_ino
;
119 return !is_checkpointed_node(sbi
, pino
);
122 int f2fs_sync_file(struct file
*file
, loff_t start
, loff_t end
, int datasync
)
124 struct inode
*inode
= file
->f_mapping
->host
;
125 struct f2fs_sb_info
*sbi
= F2FS_SB(inode
->i_sb
);
126 unsigned long long cur_version
;
128 bool need_cp
= false;
129 struct writeback_control wbc
= {
130 .sync_mode
= WB_SYNC_ALL
,
131 .nr_to_write
= LONG_MAX
,
135 if (inode
->i_sb
->s_flags
& MS_RDONLY
)
138 ret
= filemap_write_and_wait_range(inode
->i_mapping
, start
, end
);
142 /* guarantee free sections for fsync */
143 f2fs_balance_fs(sbi
);
145 mutex_lock(&inode
->i_mutex
);
147 if (datasync
&& !(inode
->i_state
& I_DIRTY_DATASYNC
))
150 mutex_lock(&sbi
->cp_mutex
);
151 cur_version
= le64_to_cpu(F2FS_CKPT(sbi
)->checkpoint_ver
);
152 mutex_unlock(&sbi
->cp_mutex
);
154 if (F2FS_I(inode
)->data_version
!= cur_version
&&
155 !(inode
->i_state
& I_DIRTY
))
157 F2FS_I(inode
)->data_version
--;
159 if (!S_ISREG(inode
->i_mode
) || inode
->i_nlink
!= 1)
161 else if (is_inode_flag_set(F2FS_I(inode
), FI_NEED_CP
))
163 else if (!space_for_roll_forward(sbi
))
165 else if (need_to_sync_dir(sbi
, inode
))
169 /* all the dirty node pages should be flushed for POR */
170 ret
= f2fs_sync_fs(inode
->i_sb
, 1);
171 clear_inode_flag(F2FS_I(inode
), FI_NEED_CP
);
173 /* if there is no written node page, write its inode page */
174 while (!sync_node_pages(sbi
, inode
->i_ino
, &wbc
)) {
175 ret
= f2fs_write_inode(inode
, NULL
);
179 filemap_fdatawait_range(sbi
->node_inode
->i_mapping
,
183 mutex_unlock(&inode
->i_mutex
);
187 static int f2fs_file_mmap(struct file
*file
, struct vm_area_struct
*vma
)
190 vma
->vm_ops
= &f2fs_file_vm_ops
;
194 static int truncate_data_blocks_range(struct dnode_of_data
*dn
, int count
)
196 int nr_free
= 0, ofs
= dn
->ofs_in_node
;
197 struct f2fs_sb_info
*sbi
= F2FS_SB(dn
->inode
->i_sb
);
198 struct f2fs_node
*raw_node
;
201 raw_node
= page_address(dn
->node_page
);
202 addr
= blkaddr_in_node(raw_node
) + ofs
;
204 for ( ; count
> 0; count
--, addr
++, dn
->ofs_in_node
++) {
205 block_t blkaddr
= le32_to_cpu(*addr
);
206 if (blkaddr
== NULL_ADDR
)
209 update_extent_cache(NULL_ADDR
, dn
);
210 invalidate_blocks(sbi
, blkaddr
);
211 dec_valid_block_count(sbi
, dn
->inode
, 1);
215 set_page_dirty(dn
->node_page
);
218 dn
->ofs_in_node
= ofs
;
222 void truncate_data_blocks(struct dnode_of_data
*dn
)
224 truncate_data_blocks_range(dn
, ADDRS_PER_BLOCK
);
227 static void truncate_partial_data_page(struct inode
*inode
, u64 from
)
229 unsigned offset
= from
& (PAGE_CACHE_SIZE
- 1);
235 page
= find_data_page(inode
, from
>> PAGE_CACHE_SHIFT
);
240 wait_on_page_writeback(page
);
241 zero_user(page
, offset
, PAGE_CACHE_SIZE
- offset
);
242 set_page_dirty(page
);
243 f2fs_put_page(page
, 1);
246 static int truncate_blocks(struct inode
*inode
, u64 from
)
248 struct f2fs_sb_info
*sbi
= F2FS_SB(inode
->i_sb
);
249 unsigned int blocksize
= inode
->i_sb
->s_blocksize
;
250 struct dnode_of_data dn
;
255 free_from
= (pgoff_t
)
256 ((from
+ blocksize
- 1) >> (sbi
->log_blocksize
));
258 mutex_lock_op(sbi
, DATA_TRUNC
);
260 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
261 err
= get_dnode_of_data(&dn
, free_from
, RDONLY_NODE
);
265 mutex_unlock_op(sbi
, DATA_TRUNC
);
269 if (IS_INODE(dn
.node_page
))
270 count
= ADDRS_PER_INODE
;
272 count
= ADDRS_PER_BLOCK
;
274 count
-= dn
.ofs_in_node
;
276 if (dn
.ofs_in_node
|| IS_INODE(dn
.node_page
)) {
277 truncate_data_blocks_range(&dn
, count
);
283 err
= truncate_inode_blocks(inode
, free_from
);
284 mutex_unlock_op(sbi
, DATA_TRUNC
);
286 /* lastly zero out the first data page */
287 truncate_partial_data_page(inode
, from
);
292 void f2fs_truncate(struct inode
*inode
)
294 if (!(S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
295 S_ISLNK(inode
->i_mode
)))
298 if (!truncate_blocks(inode
, i_size_read(inode
))) {
299 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
300 mark_inode_dirty(inode
);
304 static int f2fs_getattr(struct vfsmount
*mnt
,
305 struct dentry
*dentry
, struct kstat
*stat
)
307 struct inode
*inode
= dentry
->d_inode
;
308 generic_fillattr(inode
, stat
);
313 #ifdef CONFIG_F2FS_FS_POSIX_ACL
314 static void __setattr_copy(struct inode
*inode
, const struct iattr
*attr
)
316 struct f2fs_inode_info
*fi
= F2FS_I(inode
);
317 unsigned int ia_valid
= attr
->ia_valid
;
319 if (ia_valid
& ATTR_UID
)
320 inode
->i_uid
= attr
->ia_uid
;
321 if (ia_valid
& ATTR_GID
)
322 inode
->i_gid
= attr
->ia_gid
;
323 if (ia_valid
& ATTR_ATIME
)
324 inode
->i_atime
= timespec_trunc(attr
->ia_atime
,
325 inode
->i_sb
->s_time_gran
);
326 if (ia_valid
& ATTR_MTIME
)
327 inode
->i_mtime
= timespec_trunc(attr
->ia_mtime
,
328 inode
->i_sb
->s_time_gran
);
329 if (ia_valid
& ATTR_CTIME
)
330 inode
->i_ctime
= timespec_trunc(attr
->ia_ctime
,
331 inode
->i_sb
->s_time_gran
);
332 if (ia_valid
& ATTR_MODE
) {
333 umode_t mode
= attr
->ia_mode
;
335 if (!in_group_p(inode
->i_gid
) && !capable(CAP_FSETID
))
337 set_acl_inode(fi
, mode
);
341 #define __setattr_copy setattr_copy
344 int f2fs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
346 struct inode
*inode
= dentry
->d_inode
;
347 struct f2fs_inode_info
*fi
= F2FS_I(inode
);
350 err
= inode_change_ok(inode
, attr
);
354 if ((attr
->ia_valid
& ATTR_SIZE
) &&
355 attr
->ia_size
!= i_size_read(inode
)) {
356 truncate_setsize(inode
, attr
->ia_size
);
357 f2fs_truncate(inode
);
358 f2fs_balance_fs(F2FS_SB(inode
->i_sb
));
361 __setattr_copy(inode
, attr
);
363 if (attr
->ia_valid
& ATTR_MODE
) {
364 err
= f2fs_acl_chmod(inode
);
365 if (err
|| is_inode_flag_set(fi
, FI_ACL_MODE
)) {
366 inode
->i_mode
= fi
->i_acl_mode
;
367 clear_inode_flag(fi
, FI_ACL_MODE
);
371 mark_inode_dirty(inode
);
375 const struct inode_operations f2fs_file_inode_operations
= {
376 .getattr
= f2fs_getattr
,
377 .setattr
= f2fs_setattr
,
378 .get_acl
= f2fs_get_acl
,
379 #ifdef CONFIG_F2FS_FS_XATTR
380 .setxattr
= generic_setxattr
,
381 .getxattr
= generic_getxattr
,
382 .listxattr
= f2fs_listxattr
,
383 .removexattr
= generic_removexattr
,
387 static void fill_zero(struct inode
*inode
, pgoff_t index
,
388 loff_t start
, loff_t len
)
390 struct f2fs_sb_info
*sbi
= F2FS_SB(inode
->i_sb
);
396 f2fs_balance_fs(sbi
);
398 mutex_lock_op(sbi
, DATA_NEW
);
399 page
= get_new_data_page(inode
, index
, false);
400 mutex_unlock_op(sbi
, DATA_NEW
);
403 wait_on_page_writeback(page
);
404 zero_user(page
, start
, len
);
405 set_page_dirty(page
);
406 f2fs_put_page(page
, 1);
410 int truncate_hole(struct inode
*inode
, pgoff_t pg_start
, pgoff_t pg_end
)
415 for (index
= pg_start
; index
< pg_end
; index
++) {
416 struct dnode_of_data dn
;
417 struct f2fs_sb_info
*sbi
= F2FS_SB(inode
->i_sb
);
419 f2fs_balance_fs(sbi
);
421 mutex_lock_op(sbi
, DATA_TRUNC
);
422 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
423 err
= get_dnode_of_data(&dn
, index
, RDONLY_NODE
);
425 mutex_unlock_op(sbi
, DATA_TRUNC
);
431 if (dn
.data_blkaddr
!= NULL_ADDR
)
432 truncate_data_blocks_range(&dn
, 1);
434 mutex_unlock_op(sbi
, DATA_TRUNC
);
439 static int punch_hole(struct inode
*inode
, loff_t offset
, loff_t len
, int mode
)
441 pgoff_t pg_start
, pg_end
;
442 loff_t off_start
, off_end
;
445 pg_start
= ((unsigned long long) offset
) >> PAGE_CACHE_SHIFT
;
446 pg_end
= ((unsigned long long) offset
+ len
) >> PAGE_CACHE_SHIFT
;
448 off_start
= offset
& (PAGE_CACHE_SIZE
- 1);
449 off_end
= (offset
+ len
) & (PAGE_CACHE_SIZE
- 1);
451 if (pg_start
== pg_end
) {
452 fill_zero(inode
, pg_start
, off_start
,
453 off_end
- off_start
);
456 fill_zero(inode
, pg_start
++, off_start
,
457 PAGE_CACHE_SIZE
- off_start
);
459 fill_zero(inode
, pg_end
, 0, off_end
);
461 if (pg_start
< pg_end
) {
462 struct address_space
*mapping
= inode
->i_mapping
;
463 loff_t blk_start
, blk_end
;
465 blk_start
= pg_start
<< PAGE_CACHE_SHIFT
;
466 blk_end
= pg_end
<< PAGE_CACHE_SHIFT
;
467 truncate_inode_pages_range(mapping
, blk_start
,
469 ret
= truncate_hole(inode
, pg_start
, pg_end
);
473 if (!(mode
& FALLOC_FL_KEEP_SIZE
) &&
474 i_size_read(inode
) <= (offset
+ len
)) {
475 i_size_write(inode
, offset
);
476 mark_inode_dirty(inode
);
482 static int expand_inode_data(struct inode
*inode
, loff_t offset
,
483 loff_t len
, int mode
)
485 struct f2fs_sb_info
*sbi
= F2FS_SB(inode
->i_sb
);
486 pgoff_t index
, pg_start
, pg_end
;
487 loff_t new_size
= i_size_read(inode
);
488 loff_t off_start
, off_end
;
491 ret
= inode_newsize_ok(inode
, (len
+ offset
));
495 pg_start
= ((unsigned long long) offset
) >> PAGE_CACHE_SHIFT
;
496 pg_end
= ((unsigned long long) offset
+ len
) >> PAGE_CACHE_SHIFT
;
498 off_start
= offset
& (PAGE_CACHE_SIZE
- 1);
499 off_end
= (offset
+ len
) & (PAGE_CACHE_SIZE
- 1);
501 for (index
= pg_start
; index
<= pg_end
; index
++) {
502 struct dnode_of_data dn
;
504 mutex_lock_op(sbi
, DATA_NEW
);
506 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
507 ret
= get_dnode_of_data(&dn
, index
, 0);
509 mutex_unlock_op(sbi
, DATA_NEW
);
513 if (dn
.data_blkaddr
== NULL_ADDR
) {
514 ret
= reserve_new_block(&dn
);
517 mutex_unlock_op(sbi
, DATA_NEW
);
523 mutex_unlock_op(sbi
, DATA_NEW
);
525 if (pg_start
== pg_end
)
526 new_size
= offset
+ len
;
527 else if (index
== pg_start
&& off_start
)
528 new_size
= (index
+ 1) << PAGE_CACHE_SHIFT
;
529 else if (index
== pg_end
)
530 new_size
= (index
<< PAGE_CACHE_SHIFT
) + off_end
;
532 new_size
+= PAGE_CACHE_SIZE
;
535 if (!(mode
& FALLOC_FL_KEEP_SIZE
) &&
536 i_size_read(inode
) < new_size
) {
537 i_size_write(inode
, new_size
);
538 mark_inode_dirty(inode
);
544 static long f2fs_fallocate(struct file
*file
, int mode
,
545 loff_t offset
, loff_t len
)
547 struct inode
*inode
= file_inode(file
);
550 if (mode
& ~(FALLOC_FL_KEEP_SIZE
| FALLOC_FL_PUNCH_HOLE
))
553 if (mode
& FALLOC_FL_PUNCH_HOLE
)
554 ret
= punch_hole(inode
, offset
, len
, mode
);
556 ret
= expand_inode_data(inode
, offset
, len
, mode
);
559 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
560 mark_inode_dirty(inode
);
565 #define F2FS_REG_FLMASK (~(FS_DIRSYNC_FL | FS_TOPDIR_FL))
566 #define F2FS_OTHER_FLMASK (FS_NODUMP_FL | FS_NOATIME_FL)
568 static inline __u32
f2fs_mask_flags(umode_t mode
, __u32 flags
)
572 else if (S_ISREG(mode
))
573 return flags
& F2FS_REG_FLMASK
;
575 return flags
& F2FS_OTHER_FLMASK
;
578 long f2fs_ioctl(struct file
*filp
, unsigned int cmd
, unsigned long arg
)
580 struct inode
*inode
= file_inode(filp
);
581 struct f2fs_inode_info
*fi
= F2FS_I(inode
);
586 case FS_IOC_GETFLAGS
:
587 flags
= fi
->i_flags
& FS_FL_USER_VISIBLE
;
588 return put_user(flags
, (int __user
*) arg
);
589 case FS_IOC_SETFLAGS
:
591 unsigned int oldflags
;
593 ret
= mnt_want_write(filp
->f_path
.mnt
);
597 if (!inode_owner_or_capable(inode
)) {
602 if (get_user(flags
, (int __user
*) arg
)) {
607 flags
= f2fs_mask_flags(inode
->i_mode
, flags
);
609 mutex_lock(&inode
->i_mutex
);
611 oldflags
= fi
->i_flags
;
613 if ((flags
^ oldflags
) & (FS_APPEND_FL
| FS_IMMUTABLE_FL
)) {
614 if (!capable(CAP_LINUX_IMMUTABLE
)) {
615 mutex_unlock(&inode
->i_mutex
);
621 flags
= flags
& FS_FL_USER_MODIFIABLE
;
622 flags
|= oldflags
& ~FS_FL_USER_MODIFIABLE
;
624 mutex_unlock(&inode
->i_mutex
);
626 f2fs_set_inode_flags(inode
);
627 inode
->i_ctime
= CURRENT_TIME
;
628 mark_inode_dirty(inode
);
630 mnt_drop_write(filp
->f_path
.mnt
);
639 long f2fs_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
642 case F2FS_IOC32_GETFLAGS
:
643 cmd
= F2FS_IOC_GETFLAGS
;
645 case F2FS_IOC32_SETFLAGS
:
646 cmd
= F2FS_IOC_SETFLAGS
;
651 return f2fs_ioctl(file
, cmd
, (unsigned long) compat_ptr(arg
));
655 const struct file_operations f2fs_file_operations
= {
656 .llseek
= generic_file_llseek
,
657 .read
= do_sync_read
,
658 .write
= do_sync_write
,
659 .aio_read
= generic_file_aio_read
,
660 .aio_write
= generic_file_aio_write
,
661 .open
= generic_file_open
,
662 .mmap
= f2fs_file_mmap
,
663 .fsync
= f2fs_sync_file
,
664 .fallocate
= f2fs_fallocate
,
665 .unlocked_ioctl
= f2fs_ioctl
,
667 .compat_ioctl
= f2fs_compat_ioctl
,
669 .splice_read
= generic_file_splice_read
,
670 .splice_write
= generic_file_splice_write
,