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/uaccess.h>
19 #include <linux/mount.h>
27 static int f2fs_vm_page_mkwrite(struct vm_area_struct
*vma
,
30 struct page
*page
= vmf
->page
;
31 struct inode
*inode
= vma
->vm_file
->f_path
.dentry
->d_inode
;
32 struct f2fs_sb_info
*sbi
= F2FS_SB(inode
->i_sb
);
34 struct dnode_of_data dn
;
39 sb_start_pagefault(inode
->i_sb
);
41 mutex_lock_op(sbi
, DATA_NEW
);
43 /* block allocation */
44 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
45 err
= get_dnode_of_data(&dn
, page
->index
, 0);
47 mutex_unlock_op(sbi
, DATA_NEW
);
51 old_blk_addr
= dn
.data_blkaddr
;
53 if (old_blk_addr
== NULL_ADDR
) {
54 err
= reserve_new_block(&dn
);
57 mutex_unlock_op(sbi
, DATA_NEW
);
63 mutex_unlock_op(sbi
, DATA_NEW
);
66 if (page
->mapping
!= inode
->i_mapping
||
67 page_offset(page
) >= i_size_read(inode
) ||
68 !PageUptodate(page
)) {
75 * check to see if the page is mapped already (no holes)
77 if (PageMappedToDisk(page
))
81 wait_on_page_writeback(page
);
83 /* page is wholly or partially inside EOF */
84 if (((page
->index
+ 1) << PAGE_CACHE_SHIFT
) > i_size_read(inode
)) {
86 offset
= i_size_read(inode
) & ~PAGE_CACHE_MASK
;
87 zero_user_segment(page
, offset
, PAGE_CACHE_SIZE
);
90 SetPageUptodate(page
);
92 file_update_time(vma
->vm_file
);
94 sb_end_pagefault(inode
->i_sb
);
95 return block_page_mkwrite_return(err
);
98 static const struct vm_operations_struct f2fs_file_vm_ops
= {
99 .fault
= filemap_fault
,
100 .page_mkwrite
= f2fs_vm_page_mkwrite
,
101 .remap_pages
= generic_file_remap_pages
,
104 static int need_to_sync_dir(struct f2fs_sb_info
*sbi
, struct inode
*inode
)
106 struct dentry
*dentry
;
109 inode
= igrab(inode
);
110 dentry
= d_find_any_alias(inode
);
115 pino
= dentry
->d_parent
->d_inode
->i_ino
;
118 return !is_checkpointed_node(sbi
, pino
);
121 int f2fs_sync_file(struct file
*file
, loff_t start
, loff_t end
, int datasync
)
123 struct inode
*inode
= file
->f_mapping
->host
;
124 struct f2fs_sb_info
*sbi
= F2FS_SB(inode
->i_sb
);
125 unsigned long long cur_version
;
127 bool need_cp
= false;
128 struct writeback_control wbc
= {
129 .sync_mode
= WB_SYNC_ALL
,
130 .nr_to_write
= LONG_MAX
,
134 if (inode
->i_sb
->s_flags
& MS_RDONLY
)
137 ret
= filemap_write_and_wait_range(inode
->i_mapping
, start
, end
);
141 /* guarantee free sections for fsync */
142 f2fs_balance_fs(sbi
);
144 mutex_lock(&inode
->i_mutex
);
146 if (datasync
&& !(inode
->i_state
& I_DIRTY_DATASYNC
))
149 mutex_lock(&sbi
->cp_mutex
);
150 cur_version
= le64_to_cpu(F2FS_CKPT(sbi
)->checkpoint_ver
);
151 mutex_unlock(&sbi
->cp_mutex
);
153 if (F2FS_I(inode
)->data_version
!= cur_version
&&
154 !(inode
->i_state
& I_DIRTY
))
156 F2FS_I(inode
)->data_version
--;
158 if (!S_ISREG(inode
->i_mode
) || inode
->i_nlink
!= 1)
160 if (is_inode_flag_set(F2FS_I(inode
), FI_NEED_CP
))
162 if (!space_for_roll_forward(sbi
))
164 if (need_to_sync_dir(sbi
, inode
))
168 /* all the dirty node pages should be flushed for POR */
169 ret
= f2fs_sync_fs(inode
->i_sb
, 1);
170 clear_inode_flag(F2FS_I(inode
), FI_NEED_CP
);
172 /* if there is no written node page, write its inode page */
173 while (!sync_node_pages(sbi
, inode
->i_ino
, &wbc
)) {
174 ret
= f2fs_write_inode(inode
, NULL
);
178 filemap_fdatawait_range(sbi
->node_inode
->i_mapping
,
182 mutex_unlock(&inode
->i_mutex
);
186 static int f2fs_file_mmap(struct file
*file
, struct vm_area_struct
*vma
)
189 vma
->vm_ops
= &f2fs_file_vm_ops
;
193 static int truncate_data_blocks_range(struct dnode_of_data
*dn
, int count
)
195 int nr_free
= 0, ofs
= dn
->ofs_in_node
;
196 struct f2fs_sb_info
*sbi
= F2FS_SB(dn
->inode
->i_sb
);
197 struct f2fs_node
*raw_node
;
200 raw_node
= page_address(dn
->node_page
);
201 addr
= blkaddr_in_node(raw_node
) + ofs
;
203 for ( ; count
> 0; count
--, addr
++, dn
->ofs_in_node
++) {
204 block_t blkaddr
= le32_to_cpu(*addr
);
205 if (blkaddr
== NULL_ADDR
)
208 update_extent_cache(NULL_ADDR
, dn
);
209 invalidate_blocks(sbi
, blkaddr
);
210 dec_valid_block_count(sbi
, dn
->inode
, 1);
214 set_page_dirty(dn
->node_page
);
217 dn
->ofs_in_node
= ofs
;
221 void truncate_data_blocks(struct dnode_of_data
*dn
)
223 truncate_data_blocks_range(dn
, ADDRS_PER_BLOCK
);
226 static void truncate_partial_data_page(struct inode
*inode
, u64 from
)
228 unsigned offset
= from
& (PAGE_CACHE_SIZE
- 1);
234 page
= find_data_page(inode
, from
>> PAGE_CACHE_SHIFT
);
239 wait_on_page_writeback(page
);
240 zero_user(page
, offset
, PAGE_CACHE_SIZE
- offset
);
241 set_page_dirty(page
);
242 f2fs_put_page(page
, 1);
245 static int truncate_blocks(struct inode
*inode
, u64 from
)
247 struct f2fs_sb_info
*sbi
= F2FS_SB(inode
->i_sb
);
248 unsigned int blocksize
= inode
->i_sb
->s_blocksize
;
249 struct dnode_of_data dn
;
254 free_from
= (pgoff_t
)
255 ((from
+ blocksize
- 1) >> (sbi
->log_blocksize
));
257 mutex_lock_op(sbi
, DATA_TRUNC
);
259 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
260 err
= get_dnode_of_data(&dn
, free_from
, RDONLY_NODE
);
264 mutex_unlock_op(sbi
, DATA_TRUNC
);
268 if (IS_INODE(dn
.node_page
))
269 count
= ADDRS_PER_INODE
;
271 count
= ADDRS_PER_BLOCK
;
273 count
-= dn
.ofs_in_node
;
275 if (dn
.ofs_in_node
|| IS_INODE(dn
.node_page
)) {
276 truncate_data_blocks_range(&dn
, count
);
282 err
= truncate_inode_blocks(inode
, free_from
);
283 mutex_unlock_op(sbi
, DATA_TRUNC
);
285 /* lastly zero out the first data page */
286 truncate_partial_data_page(inode
, from
);
291 void f2fs_truncate(struct inode
*inode
)
293 if (!(S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
294 S_ISLNK(inode
->i_mode
)))
297 if (!truncate_blocks(inode
, i_size_read(inode
))) {
298 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
299 mark_inode_dirty(inode
);
302 f2fs_balance_fs(F2FS_SB(inode
->i_sb
));
305 static int f2fs_getattr(struct vfsmount
*mnt
,
306 struct dentry
*dentry
, struct kstat
*stat
)
308 struct inode
*inode
= dentry
->d_inode
;
309 generic_fillattr(inode
, stat
);
314 #ifdef CONFIG_F2FS_FS_POSIX_ACL
315 static void __setattr_copy(struct inode
*inode
, const struct iattr
*attr
)
317 struct f2fs_inode_info
*fi
= F2FS_I(inode
);
318 unsigned int ia_valid
= attr
->ia_valid
;
320 if (ia_valid
& ATTR_UID
)
321 inode
->i_uid
= attr
->ia_uid
;
322 if (ia_valid
& ATTR_GID
)
323 inode
->i_gid
= attr
->ia_gid
;
324 if (ia_valid
& ATTR_ATIME
)
325 inode
->i_atime
= timespec_trunc(attr
->ia_atime
,
326 inode
->i_sb
->s_time_gran
);
327 if (ia_valid
& ATTR_MTIME
)
328 inode
->i_mtime
= timespec_trunc(attr
->ia_mtime
,
329 inode
->i_sb
->s_time_gran
);
330 if (ia_valid
& ATTR_CTIME
)
331 inode
->i_ctime
= timespec_trunc(attr
->ia_ctime
,
332 inode
->i_sb
->s_time_gran
);
333 if (ia_valid
& ATTR_MODE
) {
334 umode_t mode
= attr
->ia_mode
;
336 if (!in_group_p(inode
->i_gid
) && !capable(CAP_FSETID
))
338 set_acl_inode(fi
, mode
);
342 #define __setattr_copy setattr_copy
345 int f2fs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
347 struct inode
*inode
= dentry
->d_inode
;
348 struct f2fs_inode_info
*fi
= F2FS_I(inode
);
351 err
= inode_change_ok(inode
, attr
);
355 if ((attr
->ia_valid
& ATTR_SIZE
) &&
356 attr
->ia_size
!= i_size_read(inode
)) {
357 truncate_setsize(inode
, attr
->ia_size
);
358 f2fs_truncate(inode
);
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
)
395 page
= get_new_data_page(inode
, index
, false);
398 wait_on_page_writeback(page
);
399 zero_user(page
, start
, len
);
400 set_page_dirty(page
);
401 f2fs_put_page(page
, 1);
405 int truncate_hole(struct inode
*inode
, pgoff_t pg_start
, pgoff_t pg_end
)
410 for (index
= pg_start
; index
< pg_end
; index
++) {
411 struct dnode_of_data dn
;
412 struct f2fs_sb_info
*sbi
= F2FS_SB(inode
->i_sb
);
414 f2fs_balance_fs(sbi
);
416 mutex_lock_op(sbi
, DATA_TRUNC
);
417 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
418 err
= get_dnode_of_data(&dn
, index
, RDONLY_NODE
);
420 mutex_unlock_op(sbi
, DATA_TRUNC
);
426 if (dn
.data_blkaddr
!= NULL_ADDR
)
427 truncate_data_blocks_range(&dn
, 1);
429 mutex_unlock_op(sbi
, DATA_TRUNC
);
434 static int punch_hole(struct inode
*inode
, loff_t offset
, loff_t len
, int mode
)
436 pgoff_t pg_start
, pg_end
;
437 loff_t off_start
, off_end
;
440 pg_start
= ((unsigned long long) offset
) >> PAGE_CACHE_SHIFT
;
441 pg_end
= ((unsigned long long) offset
+ len
) >> PAGE_CACHE_SHIFT
;
443 off_start
= offset
& (PAGE_CACHE_SIZE
- 1);
444 off_end
= (offset
+ len
) & (PAGE_CACHE_SIZE
- 1);
446 if (pg_start
== pg_end
) {
447 fill_zero(inode
, pg_start
, off_start
,
448 off_end
- off_start
);
451 fill_zero(inode
, pg_start
++, off_start
,
452 PAGE_CACHE_SIZE
- off_start
);
454 fill_zero(inode
, pg_end
, 0, off_end
);
456 if (pg_start
< pg_end
) {
457 struct address_space
*mapping
= inode
->i_mapping
;
458 loff_t blk_start
, blk_end
;
460 blk_start
= pg_start
<< PAGE_CACHE_SHIFT
;
461 blk_end
= pg_end
<< PAGE_CACHE_SHIFT
;
462 truncate_inode_pages_range(mapping
, blk_start
,
464 ret
= truncate_hole(inode
, pg_start
, pg_end
);
468 if (!(mode
& FALLOC_FL_KEEP_SIZE
) &&
469 i_size_read(inode
) <= (offset
+ len
)) {
470 i_size_write(inode
, offset
);
471 mark_inode_dirty(inode
);
477 static int expand_inode_data(struct inode
*inode
, loff_t offset
,
478 loff_t len
, int mode
)
480 struct f2fs_sb_info
*sbi
= F2FS_SB(inode
->i_sb
);
481 pgoff_t index
, pg_start
, pg_end
;
482 loff_t new_size
= i_size_read(inode
);
483 loff_t off_start
, off_end
;
486 ret
= inode_newsize_ok(inode
, (len
+ offset
));
490 pg_start
= ((unsigned long long) offset
) >> PAGE_CACHE_SHIFT
;
491 pg_end
= ((unsigned long long) offset
+ len
) >> PAGE_CACHE_SHIFT
;
493 off_start
= offset
& (PAGE_CACHE_SIZE
- 1);
494 off_end
= (offset
+ len
) & (PAGE_CACHE_SIZE
- 1);
496 for (index
= pg_start
; index
<= pg_end
; index
++) {
497 struct dnode_of_data dn
;
499 mutex_lock_op(sbi
, DATA_NEW
);
501 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
502 ret
= get_dnode_of_data(&dn
, index
, 0);
504 mutex_unlock_op(sbi
, DATA_NEW
);
508 if (dn
.data_blkaddr
== NULL_ADDR
) {
509 ret
= reserve_new_block(&dn
);
512 mutex_unlock_op(sbi
, DATA_NEW
);
518 mutex_unlock_op(sbi
, DATA_NEW
);
520 if (pg_start
== pg_end
)
521 new_size
= offset
+ len
;
522 else if (index
== pg_start
&& off_start
)
523 new_size
= (index
+ 1) << PAGE_CACHE_SHIFT
;
524 else if (index
== pg_end
)
525 new_size
= (index
<< PAGE_CACHE_SHIFT
) + off_end
;
527 new_size
+= PAGE_CACHE_SIZE
;
530 if (!(mode
& FALLOC_FL_KEEP_SIZE
) &&
531 i_size_read(inode
) < new_size
) {
532 i_size_write(inode
, new_size
);
533 mark_inode_dirty(inode
);
539 static long f2fs_fallocate(struct file
*file
, int mode
,
540 loff_t offset
, loff_t len
)
542 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
545 if (mode
& ~(FALLOC_FL_KEEP_SIZE
| FALLOC_FL_PUNCH_HOLE
))
548 if (mode
& FALLOC_FL_PUNCH_HOLE
)
549 ret
= punch_hole(inode
, offset
, len
, mode
);
551 ret
= expand_inode_data(inode
, offset
, len
, mode
);
554 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
555 mark_inode_dirty(inode
);
560 #define F2FS_REG_FLMASK (~(FS_DIRSYNC_FL | FS_TOPDIR_FL))
561 #define F2FS_OTHER_FLMASK (FS_NODUMP_FL | FS_NOATIME_FL)
563 static inline __u32
f2fs_mask_flags(umode_t mode
, __u32 flags
)
567 else if (S_ISREG(mode
))
568 return flags
& F2FS_REG_FLMASK
;
570 return flags
& F2FS_OTHER_FLMASK
;
573 long f2fs_ioctl(struct file
*filp
, unsigned int cmd
, unsigned long arg
)
575 struct inode
*inode
= filp
->f_dentry
->d_inode
;
576 struct f2fs_inode_info
*fi
= F2FS_I(inode
);
581 case FS_IOC_GETFLAGS
:
582 flags
= fi
->i_flags
& FS_FL_USER_VISIBLE
;
583 return put_user(flags
, (int __user
*) arg
);
584 case FS_IOC_SETFLAGS
:
586 unsigned int oldflags
;
588 ret
= mnt_want_write(filp
->f_path
.mnt
);
592 if (!inode_owner_or_capable(inode
)) {
597 if (get_user(flags
, (int __user
*) arg
)) {
602 flags
= f2fs_mask_flags(inode
->i_mode
, flags
);
604 mutex_lock(&inode
->i_mutex
);
606 oldflags
= fi
->i_flags
;
608 if ((flags
^ oldflags
) & (FS_APPEND_FL
| FS_IMMUTABLE_FL
)) {
609 if (!capable(CAP_LINUX_IMMUTABLE
)) {
610 mutex_unlock(&inode
->i_mutex
);
616 flags
= flags
& FS_FL_USER_MODIFIABLE
;
617 flags
|= oldflags
& ~FS_FL_USER_MODIFIABLE
;
619 mutex_unlock(&inode
->i_mutex
);
621 f2fs_set_inode_flags(inode
);
622 inode
->i_ctime
= CURRENT_TIME
;
623 mark_inode_dirty(inode
);
625 mnt_drop_write(filp
->f_path
.mnt
);
633 const struct file_operations f2fs_file_operations
= {
634 .llseek
= generic_file_llseek
,
635 .read
= do_sync_read
,
636 .write
= do_sync_write
,
637 .aio_read
= generic_file_aio_read
,
638 .aio_write
= generic_file_aio_write
,
639 .open
= generic_file_open
,
640 .mmap
= f2fs_file_mmap
,
641 .fsync
= f2fs_sync_file
,
642 .fallocate
= f2fs_fallocate
,
643 .unlocked_ioctl
= f2fs_ioctl
,
644 .splice_read
= generic_file_splice_read
,
645 .splice_write
= generic_file_splice_write
,