2 * Copyright (c) 2012 Taobao.
3 * Written by Tao Ma <boyu.mt@taobao.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2.1 of the GNU Lesser General Public License
7 * as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 #include "ext4_jbd2.h"
18 #include <linux/fiemap.h>
20 #define EXT4_XATTR_SYSTEM_DATA "data"
21 #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS))
22 #define EXT4_INLINE_DOTDOT_OFFSET 2
23 #define EXT4_INLINE_DOTDOT_SIZE 4
25 static int ext4_get_inline_size(struct inode
*inode
)
27 if (EXT4_I(inode
)->i_inline_off
)
28 return EXT4_I(inode
)->i_inline_size
;
33 static int get_max_inline_xattr_value_size(struct inode
*inode
,
34 struct ext4_iloc
*iloc
)
36 struct ext4_xattr_ibody_header
*header
;
37 struct ext4_xattr_entry
*entry
;
38 struct ext4_inode
*raw_inode
;
41 min_offs
= EXT4_SB(inode
->i_sb
)->s_inode_size
-
42 EXT4_GOOD_OLD_INODE_SIZE
-
43 EXT4_I(inode
)->i_extra_isize
-
44 sizeof(struct ext4_xattr_ibody_header
);
47 * We need to subtract another sizeof(__u32) since an in-inode xattr
48 * needs an empty 4 bytes to indicate the gap between the xattr entry
49 * and the name/value pair.
51 if (!ext4_test_inode_state(inode
, EXT4_STATE_XATTR
))
52 return EXT4_XATTR_SIZE(min_offs
-
53 EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA
)) -
54 EXT4_XATTR_ROUND
- sizeof(__u32
));
56 raw_inode
= ext4_raw_inode(iloc
);
57 header
= IHDR(inode
, raw_inode
);
58 entry
= IFIRST(header
);
60 /* Compute min_offs. */
61 for (; !IS_LAST_ENTRY(entry
); entry
= EXT4_XATTR_NEXT(entry
)) {
62 if (!entry
->e_value_block
&& entry
->e_value_size
) {
63 size_t offs
= le16_to_cpu(entry
->e_value_offs
);
69 ((void *)entry
- (void *)IFIRST(header
)) - sizeof(__u32
);
71 if (EXT4_I(inode
)->i_inline_off
) {
72 entry
= (struct ext4_xattr_entry
*)
73 ((void *)raw_inode
+ EXT4_I(inode
)->i_inline_off
);
75 free
+= EXT4_XATTR_SIZE(le32_to_cpu(entry
->e_value_size
));
79 free
-= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA
));
81 if (free
> EXT4_XATTR_ROUND
)
82 free
= EXT4_XATTR_SIZE(free
- EXT4_XATTR_ROUND
);
91 * Get the maximum size we now can store in an inode.
92 * If we can't find the space for a xattr entry, don't use the space
93 * of the extents since we have no space to indicate the inline data.
95 int ext4_get_max_inline_size(struct inode
*inode
)
97 int error
, max_inline_size
;
98 struct ext4_iloc iloc
;
100 if (EXT4_I(inode
)->i_extra_isize
== 0)
103 error
= ext4_get_inode_loc(inode
, &iloc
);
105 ext4_error_inode(inode
, __func__
, __LINE__
, 0,
106 "can't get inode location %lu",
111 down_read(&EXT4_I(inode
)->xattr_sem
);
112 max_inline_size
= get_max_inline_xattr_value_size(inode
, &iloc
);
113 up_read(&EXT4_I(inode
)->xattr_sem
);
117 if (!max_inline_size
)
120 return max_inline_size
+ EXT4_MIN_INLINE_DATA_SIZE
;
124 * this function does not take xattr_sem, which is OK because it is
125 * currently only used in a code path coming form ext4_iget, before
126 * the new inode has been unlocked
128 int ext4_find_inline_data_nolock(struct inode
*inode
)
130 struct ext4_xattr_ibody_find is
= {
131 .s
= { .not_found
= -ENODATA
, },
133 struct ext4_xattr_info i
= {
134 .name_index
= EXT4_XATTR_INDEX_SYSTEM
,
135 .name
= EXT4_XATTR_SYSTEM_DATA
,
139 if (EXT4_I(inode
)->i_extra_isize
== 0)
142 error
= ext4_get_inode_loc(inode
, &is
.iloc
);
146 error
= ext4_xattr_ibody_find(inode
, &i
, &is
);
150 if (!is
.s
.not_found
) {
151 EXT4_I(inode
)->i_inline_off
= (u16
)((void *)is
.s
.here
-
152 (void *)ext4_raw_inode(&is
.iloc
));
153 EXT4_I(inode
)->i_inline_size
= EXT4_MIN_INLINE_DATA_SIZE
+
154 le32_to_cpu(is
.s
.here
->e_value_size
);
155 ext4_set_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
);
162 static int ext4_read_inline_data(struct inode
*inode
, void *buffer
,
164 struct ext4_iloc
*iloc
)
166 struct ext4_xattr_entry
*entry
;
167 struct ext4_xattr_ibody_header
*header
;
169 struct ext4_inode
*raw_inode
;
174 BUG_ON(len
> EXT4_I(inode
)->i_inline_size
);
176 cp_len
= len
< EXT4_MIN_INLINE_DATA_SIZE
?
177 len
: EXT4_MIN_INLINE_DATA_SIZE
;
179 raw_inode
= ext4_raw_inode(iloc
);
180 memcpy(buffer
, (void *)(raw_inode
->i_block
), cp_len
);
188 header
= IHDR(inode
, raw_inode
);
189 entry
= (struct ext4_xattr_entry
*)((void *)raw_inode
+
190 EXT4_I(inode
)->i_inline_off
);
191 len
= min_t(unsigned int, len
,
192 (unsigned int)le32_to_cpu(entry
->e_value_size
));
195 (void *)IFIRST(header
) + le16_to_cpu(entry
->e_value_offs
), len
);
203 * write the buffer to the inline inode.
204 * If 'create' is set, we don't need to do the extra copy in the xattr
205 * value since it is already handled by ext4_xattr_ibody_inline_set.
206 * That saves us one memcpy.
208 static void ext4_write_inline_data(struct inode
*inode
, struct ext4_iloc
*iloc
,
209 void *buffer
, loff_t pos
, unsigned int len
)
211 struct ext4_xattr_entry
*entry
;
212 struct ext4_xattr_ibody_header
*header
;
213 struct ext4_inode
*raw_inode
;
216 BUG_ON(!EXT4_I(inode
)->i_inline_off
);
217 BUG_ON(pos
+ len
> EXT4_I(inode
)->i_inline_size
);
219 raw_inode
= ext4_raw_inode(iloc
);
222 if (pos
< EXT4_MIN_INLINE_DATA_SIZE
) {
223 cp_len
= pos
+ len
> EXT4_MIN_INLINE_DATA_SIZE
?
224 EXT4_MIN_INLINE_DATA_SIZE
- pos
: len
;
225 memcpy((void *)raw_inode
->i_block
+ pos
, buffer
, cp_len
);
235 pos
-= EXT4_MIN_INLINE_DATA_SIZE
;
236 header
= IHDR(inode
, raw_inode
);
237 entry
= (struct ext4_xattr_entry
*)((void *)raw_inode
+
238 EXT4_I(inode
)->i_inline_off
);
240 memcpy((void *)IFIRST(header
) + le16_to_cpu(entry
->e_value_offs
) + pos
,
244 static int ext4_create_inline_data(handle_t
*handle
,
245 struct inode
*inode
, unsigned len
)
249 struct ext4_xattr_ibody_find is
= {
250 .s
= { .not_found
= -ENODATA
, },
252 struct ext4_xattr_info i
= {
253 .name_index
= EXT4_XATTR_INDEX_SYSTEM
,
254 .name
= EXT4_XATTR_SYSTEM_DATA
,
257 error
= ext4_get_inode_loc(inode
, &is
.iloc
);
261 BUFFER_TRACE(is
.iloc
.bh
, "get_write_access");
262 error
= ext4_journal_get_write_access(handle
, is
.iloc
.bh
);
266 if (len
> EXT4_MIN_INLINE_DATA_SIZE
) {
267 value
= EXT4_ZERO_XATTR_VALUE
;
268 len
-= EXT4_MIN_INLINE_DATA_SIZE
;
274 /* Insert the the xttr entry. */
278 error
= ext4_xattr_ibody_find(inode
, &i
, &is
);
282 BUG_ON(!is
.s
.not_found
);
284 error
= ext4_xattr_ibody_inline_set(handle
, inode
, &i
, &is
);
286 if (error
== -ENOSPC
)
287 ext4_clear_inode_state(inode
,
288 EXT4_STATE_MAY_INLINE_DATA
);
292 memset((void *)ext4_raw_inode(&is
.iloc
)->i_block
,
293 0, EXT4_MIN_INLINE_DATA_SIZE
);
295 EXT4_I(inode
)->i_inline_off
= (u16
)((void *)is
.s
.here
-
296 (void *)ext4_raw_inode(&is
.iloc
));
297 EXT4_I(inode
)->i_inline_size
= len
+ EXT4_MIN_INLINE_DATA_SIZE
;
298 ext4_clear_inode_flag(inode
, EXT4_INODE_EXTENTS
);
299 ext4_set_inode_flag(inode
, EXT4_INODE_INLINE_DATA
);
301 error
= ext4_mark_iloc_dirty(handle
, inode
, &is
.iloc
);
308 static int ext4_update_inline_data(handle_t
*handle
, struct inode
*inode
,
313 struct ext4_xattr_ibody_find is
= {
314 .s
= { .not_found
= -ENODATA
, },
316 struct ext4_xattr_info i
= {
317 .name_index
= EXT4_XATTR_INDEX_SYSTEM
,
318 .name
= EXT4_XATTR_SYSTEM_DATA
,
321 /* If the old space is ok, write the data directly. */
322 if (len
<= EXT4_I(inode
)->i_inline_size
)
325 error
= ext4_get_inode_loc(inode
, &is
.iloc
);
329 error
= ext4_xattr_ibody_find(inode
, &i
, &is
);
333 BUG_ON(is
.s
.not_found
);
335 len
-= EXT4_MIN_INLINE_DATA_SIZE
;
336 value
= kzalloc(len
, GFP_NOFS
);
340 error
= ext4_xattr_ibody_get(inode
, i
.name_index
, i
.name
,
342 if (error
== -ENODATA
)
345 BUFFER_TRACE(is
.iloc
.bh
, "get_write_access");
346 error
= ext4_journal_get_write_access(handle
, is
.iloc
.bh
);
350 /* Update the xttr entry. */
354 error
= ext4_xattr_ibody_inline_set(handle
, inode
, &i
, &is
);
358 EXT4_I(inode
)->i_inline_off
= (u16
)((void *)is
.s
.here
-
359 (void *)ext4_raw_inode(&is
.iloc
));
360 EXT4_I(inode
)->i_inline_size
= EXT4_MIN_INLINE_DATA_SIZE
+
361 le32_to_cpu(is
.s
.here
->e_value_size
);
362 ext4_set_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
);
364 error
= ext4_mark_iloc_dirty(handle
, inode
, &is
.iloc
);
372 static int ext4_prepare_inline_data(handle_t
*handle
, struct inode
*inode
,
376 struct ext4_inode_info
*ei
= EXT4_I(inode
);
378 if (!ext4_test_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
))
381 size
= ext4_get_max_inline_size(inode
);
385 down_write(&EXT4_I(inode
)->xattr_sem
);
387 if (ei
->i_inline_off
)
388 ret
= ext4_update_inline_data(handle
, inode
, len
);
390 ret
= ext4_create_inline_data(handle
, inode
, len
);
392 up_write(&EXT4_I(inode
)->xattr_sem
);
397 static int ext4_destroy_inline_data_nolock(handle_t
*handle
,
400 struct ext4_inode_info
*ei
= EXT4_I(inode
);
401 struct ext4_xattr_ibody_find is
= {
402 .s
= { .not_found
= 0, },
404 struct ext4_xattr_info i
= {
405 .name_index
= EXT4_XATTR_INDEX_SYSTEM
,
406 .name
= EXT4_XATTR_SYSTEM_DATA
,
412 if (!ei
->i_inline_off
)
415 error
= ext4_get_inode_loc(inode
, &is
.iloc
);
419 error
= ext4_xattr_ibody_find(inode
, &i
, &is
);
423 BUFFER_TRACE(is
.iloc
.bh
, "get_write_access");
424 error
= ext4_journal_get_write_access(handle
, is
.iloc
.bh
);
428 error
= ext4_xattr_ibody_inline_set(handle
, inode
, &i
, &is
);
432 memset((void *)ext4_raw_inode(&is
.iloc
)->i_block
,
433 0, EXT4_MIN_INLINE_DATA_SIZE
);
435 if (EXT4_HAS_INCOMPAT_FEATURE(inode
->i_sb
,
436 EXT4_FEATURE_INCOMPAT_EXTENTS
)) {
437 if (S_ISDIR(inode
->i_mode
) ||
438 S_ISREG(inode
->i_mode
) || S_ISLNK(inode
->i_mode
)) {
439 ext4_set_inode_flag(inode
, EXT4_INODE_EXTENTS
);
440 ext4_ext_tree_init(handle
, inode
);
443 ext4_clear_inode_flag(inode
, EXT4_INODE_INLINE_DATA
);
446 error
= ext4_mark_iloc_dirty(handle
, inode
, &is
.iloc
);
448 EXT4_I(inode
)->i_inline_off
= 0;
449 EXT4_I(inode
)->i_inline_size
= 0;
450 ext4_clear_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
);
453 if (error
== -ENODATA
)
458 static int ext4_read_inline_page(struct inode
*inode
, struct page
*page
)
463 struct ext4_iloc iloc
;
465 BUG_ON(!PageLocked(page
));
466 BUG_ON(!ext4_has_inline_data(inode
));
469 if (!EXT4_I(inode
)->i_inline_off
) {
470 ext4_warning(inode
->i_sb
, "inode %lu doesn't have inline data.",
475 ret
= ext4_get_inode_loc(inode
, &iloc
);
479 len
= min_t(size_t, ext4_get_inline_size(inode
), i_size_read(inode
));
480 kaddr
= kmap_atomic(page
);
481 ret
= ext4_read_inline_data(inode
, kaddr
, len
, &iloc
);
482 flush_dcache_page(page
);
483 kunmap_atomic(kaddr
);
484 zero_user_segment(page
, len
, PAGE_CACHE_SIZE
);
485 SetPageUptodate(page
);
492 int ext4_readpage_inline(struct inode
*inode
, struct page
*page
)
496 down_read(&EXT4_I(inode
)->xattr_sem
);
497 if (!ext4_has_inline_data(inode
)) {
498 up_read(&EXT4_I(inode
)->xattr_sem
);
503 * Current inline data can only exist in the 1st page,
504 * So for all the other pages, just set them uptodate.
507 ret
= ext4_read_inline_page(inode
, page
);
508 else if (!PageUptodate(page
)) {
509 zero_user_segment(page
, 0, PAGE_CACHE_SIZE
);
510 SetPageUptodate(page
);
513 up_read(&EXT4_I(inode
)->xattr_sem
);
516 return ret
>= 0 ? 0 : ret
;
519 static int ext4_convert_inline_data_to_extent(struct address_space
*mapping
,
523 int ret
, needed_blocks
;
524 handle_t
*handle
= NULL
;
525 int retries
= 0, sem_held
= 0;
526 struct page
*page
= NULL
;
528 struct ext4_iloc iloc
;
530 if (!ext4_has_inline_data(inode
)) {
532 * clear the flag so that no new write
533 * will trap here again.
535 ext4_clear_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
);
539 needed_blocks
= ext4_writepage_trans_blocks(inode
);
541 ret
= ext4_get_inode_loc(inode
, &iloc
);
546 handle
= ext4_journal_start(inode
, EXT4_HT_WRITE_PAGE
, needed_blocks
);
547 if (IS_ERR(handle
)) {
548 ret
= PTR_ERR(handle
);
553 /* We cannot recurse into the filesystem as the transaction is already
555 flags
|= AOP_FLAG_NOFS
;
557 page
= grab_cache_page_write_begin(mapping
, 0, flags
);
563 down_write(&EXT4_I(inode
)->xattr_sem
);
565 /* If some one has already done this for us, just exit. */
566 if (!ext4_has_inline_data(inode
)) {
572 to
= ext4_get_inline_size(inode
);
573 if (!PageUptodate(page
)) {
574 ret
= ext4_read_inline_page(inode
, page
);
579 ret
= ext4_destroy_inline_data_nolock(handle
, inode
);
583 if (ext4_should_dioread_nolock(inode
))
584 ret
= __block_write_begin(page
, from
, to
, ext4_get_block_write
);
586 ret
= __block_write_begin(page
, from
, to
, ext4_get_block
);
588 if (!ret
&& ext4_should_journal_data(inode
)) {
589 ret
= ext4_walk_page_buffers(handle
, page_buffers(page
),
591 do_journal_get_write_access
);
596 page_cache_release(page
);
598 ext4_orphan_add(handle
, inode
);
599 up_write(&EXT4_I(inode
)->xattr_sem
);
601 ext4_journal_stop(handle
);
603 ext4_truncate_failed_write(inode
);
605 * If truncate failed early the inode might
606 * still be on the orphan list; we need to
607 * make sure the inode is removed from the
608 * orphan list in that case.
611 ext4_orphan_del(NULL
, inode
);
614 if (ret
== -ENOSPC
&& ext4_should_retry_alloc(inode
->i_sb
, &retries
))
618 block_commit_write(page
, from
, to
);
622 page_cache_release(page
);
625 up_write(&EXT4_I(inode
)->xattr_sem
);
627 ext4_journal_stop(handle
);
633 * Try to write data in the inode.
634 * If the inode has inline data, check whether the new write can be
635 * in the inode also. If not, create the page the handle, move the data
636 * to the page make it update and let the later codes create extent for it.
638 int ext4_try_to_write_inline_data(struct address_space
*mapping
,
640 loff_t pos
, unsigned len
,
647 struct ext4_iloc iloc
;
649 if (pos
+ len
> ext4_get_max_inline_size(inode
))
652 ret
= ext4_get_inode_loc(inode
, &iloc
);
657 * The possible write could happen in the inode,
658 * so try to reserve the space in inode first.
660 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 1);
661 if (IS_ERR(handle
)) {
662 ret
= PTR_ERR(handle
);
667 ret
= ext4_prepare_inline_data(handle
, inode
, pos
+ len
);
668 if (ret
&& ret
!= -ENOSPC
)
671 /* We don't have space in inline inode, so convert it to extent. */
672 if (ret
== -ENOSPC
) {
673 ext4_journal_stop(handle
);
678 flags
|= AOP_FLAG_NOFS
;
680 page
= grab_cache_page_write_begin(mapping
, 0, flags
);
687 down_read(&EXT4_I(inode
)->xattr_sem
);
688 if (!ext4_has_inline_data(inode
)) {
691 page_cache_release(page
);
695 if (!PageUptodate(page
)) {
696 ret
= ext4_read_inline_page(inode
, page
);
704 up_read(&EXT4_I(inode
)->xattr_sem
);
707 ext4_journal_stop(handle
);
711 return ext4_convert_inline_data_to_extent(mapping
,
715 int ext4_write_inline_data_end(struct inode
*inode
, loff_t pos
, unsigned len
,
716 unsigned copied
, struct page
*page
)
720 struct ext4_iloc iloc
;
722 if (unlikely(copied
< len
)) {
723 if (!PageUptodate(page
)) {
729 ret
= ext4_get_inode_loc(inode
, &iloc
);
731 ext4_std_error(inode
->i_sb
, ret
);
736 down_write(&EXT4_I(inode
)->xattr_sem
);
737 BUG_ON(!ext4_has_inline_data(inode
));
739 kaddr
= kmap_atomic(page
);
740 ext4_write_inline_data(inode
, &iloc
, kaddr
, pos
, len
);
741 kunmap_atomic(kaddr
);
742 SetPageUptodate(page
);
743 /* clear page dirty so that writepages wouldn't work for us. */
744 ClearPageDirty(page
);
746 up_write(&EXT4_I(inode
)->xattr_sem
);
753 ext4_journalled_write_inline_data(struct inode
*inode
,
759 struct ext4_iloc iloc
;
761 ret
= ext4_get_inode_loc(inode
, &iloc
);
763 ext4_std_error(inode
->i_sb
, ret
);
767 down_write(&EXT4_I(inode
)->xattr_sem
);
768 kaddr
= kmap_atomic(page
);
769 ext4_write_inline_data(inode
, &iloc
, kaddr
, 0, len
);
770 kunmap_atomic(kaddr
);
771 up_write(&EXT4_I(inode
)->xattr_sem
);
777 * Try to make the page cache and handle ready for the inline data case.
778 * We can call this function in 2 cases:
779 * 1. The inode is created and the first write exceeds inline size. We can
780 * clear the inode state safely.
781 * 2. The inode has inline data, then we need to read the data, make it
782 * update and dirty so that ext4_da_writepages can handle it. We don't
783 * need to start the journal since the file's metatdata isn't changed now.
785 static int ext4_da_convert_inline_data_to_extent(struct address_space
*mapping
,
790 int ret
= 0, inline_size
;
793 page
= grab_cache_page_write_begin(mapping
, 0, flags
);
797 down_read(&EXT4_I(inode
)->xattr_sem
);
798 if (!ext4_has_inline_data(inode
)) {
799 ext4_clear_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
);
803 inline_size
= ext4_get_inline_size(inode
);
805 if (!PageUptodate(page
)) {
806 ret
= ext4_read_inline_page(inode
, page
);
811 ret
= __block_write_begin(page
, 0, inline_size
,
812 ext4_da_get_block_prep
);
814 ext4_truncate_failed_write(inode
);
819 SetPageUptodate(page
);
820 ext4_clear_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
);
821 *fsdata
= (void *)CONVERT_INLINE_DATA
;
824 up_read(&EXT4_I(inode
)->xattr_sem
);
827 page_cache_release(page
);
833 * Prepare the write for the inline data.
834 * If the the data can be written into the inode, we just read
835 * the page and make it uptodate, and start the journal.
836 * Otherwise read the page, makes it dirty so that it can be
837 * handle in writepages(the i_disksize update is left to the
838 * normal ext4_da_write_end).
840 int ext4_da_write_inline_data_begin(struct address_space
*mapping
,
842 loff_t pos
, unsigned len
,
847 int ret
, inline_size
;
850 struct ext4_iloc iloc
;
853 ret
= ext4_get_inode_loc(inode
, &iloc
);
858 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 1);
859 if (IS_ERR(handle
)) {
860 ret
= PTR_ERR(handle
);
864 inline_size
= ext4_get_max_inline_size(inode
);
867 if (inline_size
>= pos
+ len
) {
868 ret
= ext4_prepare_inline_data(handle
, inode
, pos
+ len
);
869 if (ret
&& ret
!= -ENOSPC
)
873 if (ret
== -ENOSPC
) {
874 ret
= ext4_da_convert_inline_data_to_extent(mapping
,
878 ext4_journal_stop(handle
);
879 if (ret
== -ENOSPC
&&
880 ext4_should_retry_alloc(inode
->i_sb
, &retries
))
886 * We cannot recurse into the filesystem as the transaction
887 * is already started.
889 flags
|= AOP_FLAG_NOFS
;
891 page
= grab_cache_page_write_begin(mapping
, 0, flags
);
897 down_read(&EXT4_I(inode
)->xattr_sem
);
898 if (!ext4_has_inline_data(inode
)) {
900 goto out_release_page
;
903 if (!PageUptodate(page
)) {
904 ret
= ext4_read_inline_page(inode
, page
);
906 goto out_release_page
;
909 up_read(&EXT4_I(inode
)->xattr_sem
);
914 up_read(&EXT4_I(inode
)->xattr_sem
);
916 page_cache_release(page
);
918 ext4_journal_stop(handle
);
924 int ext4_da_write_inline_data_end(struct inode
*inode
, loff_t pos
,
925 unsigned len
, unsigned copied
,
928 int i_size_changed
= 0;
930 copied
= ext4_write_inline_data_end(inode
, pos
, len
, copied
, page
);
933 * No need to use i_size_read() here, the i_size
934 * cannot change under us because we hold i_mutex.
936 * But it's important to update i_size while still holding page lock:
937 * page writeout could otherwise come in and zero beyond i_size.
939 if (pos
+copied
> inode
->i_size
) {
940 i_size_write(inode
, pos
+copied
);
944 page_cache_release(page
);
947 * Don't mark the inode dirty under page lock. First, it unnecessarily
948 * makes the holding time of page lock longer. Second, it forces lock
949 * ordering of page lock and transaction start for journaling
953 mark_inode_dirty(inode
);
958 #ifdef INLINE_DIR_DEBUG
959 void ext4_show_inline_dir(struct inode
*dir
, struct buffer_head
*bh
,
960 void *inline_start
, int inline_size
)
963 unsigned short de_len
;
964 struct ext4_dir_entry_2
*de
= inline_start
;
965 void *dlimit
= inline_start
+ inline_size
;
967 trace_printk("inode %lu\n", dir
->i_ino
);
969 while ((void *)de
< dlimit
) {
970 de_len
= ext4_rec_len_from_disk(de
->rec_len
, inline_size
);
971 trace_printk("de: off %u rlen %u name %*.s nlen %u ino %u\n",
972 offset
, de_len
, de
->name_len
, de
->name
,
973 de
->name_len
, le32_to_cpu(de
->inode
));
974 if (ext4_check_dir_entry(dir
, NULL
, de
, bh
,
975 inline_start
, inline_size
, offset
))
979 de
= (struct ext4_dir_entry_2
*) ((char *) de
+ de_len
);
983 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
987 * Add a new entry into a inline dir.
988 * It will return -ENOSPC if no space is available, and -EIO
989 * and -EEXIST if directory entry already exists.
991 static int ext4_add_dirent_to_inline(handle_t
*handle
,
992 struct dentry
*dentry
,
994 struct ext4_iloc
*iloc
,
995 void *inline_start
, int inline_size
)
997 struct inode
*dir
= dentry
->d_parent
->d_inode
;
998 const char *name
= dentry
->d_name
.name
;
999 int namelen
= dentry
->d_name
.len
;
1001 struct ext4_dir_entry_2
*de
;
1003 err
= ext4_find_dest_de(dir
, inode
, iloc
->bh
,
1004 inline_start
, inline_size
,
1005 name
, namelen
, &de
);
1009 BUFFER_TRACE(iloc
->bh
, "get_write_access");
1010 err
= ext4_journal_get_write_access(handle
, iloc
->bh
);
1013 ext4_insert_dentry(inode
, de
, inline_size
, name
, namelen
);
1015 ext4_show_inline_dir(dir
, iloc
->bh
, inline_start
, inline_size
);
1018 * XXX shouldn't update any times until successful
1019 * completion of syscall, but too many callers depend
1022 * XXX similarly, too many callers depend on
1023 * ext4_new_inode() setting the times, but error
1024 * recovery deletes the inode, so the worst that can
1025 * happen is that the times are slightly out of date
1026 * and/or different from the directory change time.
1028 dir
->i_mtime
= dir
->i_ctime
= ext4_current_time(dir
);
1029 ext4_update_dx_flag(dir
);
1031 ext4_mark_inode_dirty(handle
, dir
);
1035 static void *ext4_get_inline_xattr_pos(struct inode
*inode
,
1036 struct ext4_iloc
*iloc
)
1038 struct ext4_xattr_entry
*entry
;
1039 struct ext4_xattr_ibody_header
*header
;
1041 BUG_ON(!EXT4_I(inode
)->i_inline_off
);
1043 header
= IHDR(inode
, ext4_raw_inode(iloc
));
1044 entry
= (struct ext4_xattr_entry
*)((void *)ext4_raw_inode(iloc
) +
1045 EXT4_I(inode
)->i_inline_off
);
1047 return (void *)IFIRST(header
) + le16_to_cpu(entry
->e_value_offs
);
1050 /* Set the final de to cover the whole block. */
1051 static void ext4_update_final_de(void *de_buf
, int old_size
, int new_size
)
1053 struct ext4_dir_entry_2
*de
, *prev_de
;
1057 de
= (struct ext4_dir_entry_2
*)de_buf
;
1059 limit
= de_buf
+ old_size
;
1062 de_len
= ext4_rec_len_from_disk(de
->rec_len
, old_size
);
1064 de
= (struct ext4_dir_entry_2
*)de_buf
;
1065 } while (de_buf
< limit
);
1067 prev_de
->rec_len
= ext4_rec_len_to_disk(de_len
+ new_size
-
1068 old_size
, new_size
);
1070 /* this is just created, so create an empty entry. */
1072 de
->rec_len
= ext4_rec_len_to_disk(new_size
, new_size
);
1076 static int ext4_update_inline_dir(handle_t
*handle
, struct inode
*dir
,
1077 struct ext4_iloc
*iloc
)
1080 int old_size
= EXT4_I(dir
)->i_inline_size
- EXT4_MIN_INLINE_DATA_SIZE
;
1081 int new_size
= get_max_inline_xattr_value_size(dir
, iloc
);
1083 if (new_size
- old_size
<= EXT4_DIR_REC_LEN(1))
1086 ret
= ext4_update_inline_data(handle
, dir
,
1087 new_size
+ EXT4_MIN_INLINE_DATA_SIZE
);
1091 ext4_update_final_de(ext4_get_inline_xattr_pos(dir
, iloc
), old_size
,
1092 EXT4_I(dir
)->i_inline_size
-
1093 EXT4_MIN_INLINE_DATA_SIZE
);
1094 dir
->i_size
= EXT4_I(dir
)->i_disksize
= EXT4_I(dir
)->i_inline_size
;
1098 static void ext4_restore_inline_data(handle_t
*handle
, struct inode
*inode
,
1099 struct ext4_iloc
*iloc
,
1100 void *buf
, int inline_size
)
1102 ext4_create_inline_data(handle
, inode
, inline_size
);
1103 ext4_write_inline_data(inode
, iloc
, buf
, 0, inline_size
);
1104 ext4_set_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
);
1107 static int ext4_finish_convert_inline_dir(handle_t
*handle
,
1108 struct inode
*inode
,
1109 struct buffer_head
*dir_block
,
1113 int err
, csum_size
= 0, header_size
= 0;
1114 struct ext4_dir_entry_2
*de
;
1115 struct ext4_dir_entry_tail
*t
;
1116 void *target
= dir_block
->b_data
;
1119 * First create "." and ".." and then copy the dir information
1120 * back to the block.
1122 de
= (struct ext4_dir_entry_2
*)target
;
1123 de
= ext4_init_dot_dotdot(inode
, de
,
1124 inode
->i_sb
->s_blocksize
, csum_size
,
1125 le32_to_cpu(((struct ext4_dir_entry_2
*)buf
)->inode
), 1);
1126 header_size
= (void *)de
- target
;
1128 memcpy((void *)de
, buf
+ EXT4_INLINE_DOTDOT_SIZE
,
1129 inline_size
- EXT4_INLINE_DOTDOT_SIZE
);
1131 if (ext4_has_metadata_csum(inode
->i_sb
))
1132 csum_size
= sizeof(struct ext4_dir_entry_tail
);
1134 inode
->i_size
= inode
->i_sb
->s_blocksize
;
1135 i_size_write(inode
, inode
->i_sb
->s_blocksize
);
1136 EXT4_I(inode
)->i_disksize
= inode
->i_sb
->s_blocksize
;
1137 ext4_update_final_de(dir_block
->b_data
,
1138 inline_size
- EXT4_INLINE_DOTDOT_SIZE
+ header_size
,
1139 inode
->i_sb
->s_blocksize
- csum_size
);
1142 t
= EXT4_DIRENT_TAIL(dir_block
->b_data
,
1143 inode
->i_sb
->s_blocksize
);
1144 initialize_dirent_tail(t
, inode
->i_sb
->s_blocksize
);
1146 set_buffer_uptodate(dir_block
);
1147 err
= ext4_handle_dirty_dirent_node(handle
, inode
, dir_block
);
1150 set_buffer_verified(dir_block
);
1155 static int ext4_convert_inline_data_nolock(handle_t
*handle
,
1156 struct inode
*inode
,
1157 struct ext4_iloc
*iloc
)
1161 struct buffer_head
*data_bh
= NULL
;
1162 struct ext4_map_blocks map
;
1165 inline_size
= ext4_get_inline_size(inode
);
1166 buf
= kmalloc(inline_size
, GFP_NOFS
);
1172 error
= ext4_read_inline_data(inode
, buf
, inline_size
, iloc
);
1177 * Make sure the inline directory entries pass checks before we try to
1178 * convert them, so that we avoid touching stuff that needs fsck.
1180 if (S_ISDIR(inode
->i_mode
)) {
1181 error
= ext4_check_all_de(inode
, iloc
->bh
,
1182 buf
+ EXT4_INLINE_DOTDOT_SIZE
,
1183 inline_size
- EXT4_INLINE_DOTDOT_SIZE
);
1188 error
= ext4_destroy_inline_data_nolock(handle
, inode
);
1195 error
= ext4_map_blocks(handle
, inode
, &map
, EXT4_GET_BLOCKS_CREATE
);
1198 if (!(map
.m_flags
& EXT4_MAP_MAPPED
)) {
1203 data_bh
= sb_getblk(inode
->i_sb
, map
.m_pblk
);
1209 lock_buffer(data_bh
);
1210 error
= ext4_journal_get_create_access(handle
, data_bh
);
1212 unlock_buffer(data_bh
);
1216 memset(data_bh
->b_data
, 0, inode
->i_sb
->s_blocksize
);
1218 if (!S_ISDIR(inode
->i_mode
)) {
1219 memcpy(data_bh
->b_data
, buf
, inline_size
);
1220 set_buffer_uptodate(data_bh
);
1221 error
= ext4_handle_dirty_metadata(handle
,
1224 error
= ext4_finish_convert_inline_dir(handle
, inode
, data_bh
,
1228 unlock_buffer(data_bh
);
1231 ext4_restore_inline_data(handle
, inode
, iloc
, buf
, inline_size
);
1240 * Try to add the new entry to the inline data.
1241 * If succeeds, return 0. If not, extended the inline dir and copied data to
1242 * the new created block.
1244 int ext4_try_add_inline_entry(handle_t
*handle
, struct dentry
*dentry
,
1245 struct inode
*inode
)
1247 int ret
, inline_size
;
1249 struct ext4_iloc iloc
;
1250 struct inode
*dir
= dentry
->d_parent
->d_inode
;
1252 ret
= ext4_get_inode_loc(dir
, &iloc
);
1256 down_write(&EXT4_I(dir
)->xattr_sem
);
1257 if (!ext4_has_inline_data(dir
))
1260 inline_start
= (void *)ext4_raw_inode(&iloc
)->i_block
+
1261 EXT4_INLINE_DOTDOT_SIZE
;
1262 inline_size
= EXT4_MIN_INLINE_DATA_SIZE
- EXT4_INLINE_DOTDOT_SIZE
;
1264 ret
= ext4_add_dirent_to_inline(handle
, dentry
, inode
, &iloc
,
1265 inline_start
, inline_size
);
1269 /* check whether it can be inserted to inline xattr space. */
1270 inline_size
= EXT4_I(dir
)->i_inline_size
-
1271 EXT4_MIN_INLINE_DATA_SIZE
;
1273 /* Try to use the xattr space.*/
1274 ret
= ext4_update_inline_dir(handle
, dir
, &iloc
);
1275 if (ret
&& ret
!= -ENOSPC
)
1278 inline_size
= EXT4_I(dir
)->i_inline_size
-
1279 EXT4_MIN_INLINE_DATA_SIZE
;
1283 inline_start
= ext4_get_inline_xattr_pos(dir
, &iloc
);
1285 ret
= ext4_add_dirent_to_inline(handle
, dentry
, inode
, &iloc
,
1286 inline_start
, inline_size
);
1293 * The inline space is filled up, so create a new block for it.
1294 * As the extent tree will be created, we have to save the inline
1297 ret
= ext4_convert_inline_data_nolock(handle
, dir
, &iloc
);
1300 ext4_mark_inode_dirty(handle
, dir
);
1301 up_write(&EXT4_I(dir
)->xattr_sem
);
1307 * This function fills a red-black tree with information from an
1308 * inlined dir. It returns the number directory entries loaded
1309 * into the tree. If there is an error it is returned in err.
1311 int htree_inlinedir_to_tree(struct file
*dir_file
,
1312 struct inode
*dir
, ext4_lblk_t block
,
1313 struct dx_hash_info
*hinfo
,
1314 __u32 start_hash
, __u32 start_minor_hash
,
1315 int *has_inline_data
)
1317 int err
= 0, count
= 0;
1318 unsigned int parent_ino
;
1320 struct ext4_dir_entry_2
*de
;
1321 struct inode
*inode
= file_inode(dir_file
);
1322 int ret
, inline_size
= 0;
1323 struct ext4_iloc iloc
;
1324 void *dir_buf
= NULL
;
1325 struct ext4_dir_entry_2 fake
;
1327 ret
= ext4_get_inode_loc(inode
, &iloc
);
1331 down_read(&EXT4_I(inode
)->xattr_sem
);
1332 if (!ext4_has_inline_data(inode
)) {
1333 up_read(&EXT4_I(inode
)->xattr_sem
);
1334 *has_inline_data
= 0;
1338 inline_size
= ext4_get_inline_size(inode
);
1339 dir_buf
= kmalloc(inline_size
, GFP_NOFS
);
1342 up_read(&EXT4_I(inode
)->xattr_sem
);
1346 ret
= ext4_read_inline_data(inode
, dir_buf
, inline_size
, &iloc
);
1347 up_read(&EXT4_I(inode
)->xattr_sem
);
1352 parent_ino
= le32_to_cpu(((struct ext4_dir_entry_2
*)dir_buf
)->inode
);
1353 while (pos
< inline_size
) {
1355 * As inlined dir doesn't store any information about '.' and
1356 * only the inode number of '..' is stored, we have to handle
1360 fake
.inode
= cpu_to_le32(inode
->i_ino
);
1362 strcpy(fake
.name
, ".");
1363 fake
.rec_len
= ext4_rec_len_to_disk(
1364 EXT4_DIR_REC_LEN(fake
.name_len
),
1366 ext4_set_de_type(inode
->i_sb
, &fake
, S_IFDIR
);
1368 pos
= EXT4_INLINE_DOTDOT_OFFSET
;
1369 } else if (pos
== EXT4_INLINE_DOTDOT_OFFSET
) {
1370 fake
.inode
= cpu_to_le32(parent_ino
);
1372 strcpy(fake
.name
, "..");
1373 fake
.rec_len
= ext4_rec_len_to_disk(
1374 EXT4_DIR_REC_LEN(fake
.name_len
),
1376 ext4_set_de_type(inode
->i_sb
, &fake
, S_IFDIR
);
1378 pos
= EXT4_INLINE_DOTDOT_SIZE
;
1380 de
= (struct ext4_dir_entry_2
*)(dir_buf
+ pos
);
1381 pos
+= ext4_rec_len_from_disk(de
->rec_len
, inline_size
);
1382 if (ext4_check_dir_entry(inode
, dir_file
, de
,
1384 inline_size
, pos
)) {
1390 ext4fs_dirhash(de
->name
, de
->name_len
, hinfo
);
1391 if ((hinfo
->hash
< start_hash
) ||
1392 ((hinfo
->hash
== start_hash
) &&
1393 (hinfo
->minor_hash
< start_minor_hash
)))
1397 err
= ext4_htree_store_dirent(dir_file
,
1398 hinfo
->hash
, hinfo
->minor_hash
, de
);
1413 * So this function is called when the volume is mkfsed with
1414 * dir_index disabled. In order to keep f_pos persistent
1415 * after we convert from an inlined dir to a blocked based,
1416 * we just pretend that we are a normal dir and return the
1417 * offset as if '.' and '..' really take place.
1420 int ext4_read_inline_dir(struct file
*file
,
1421 struct dir_context
*ctx
,
1422 int *has_inline_data
)
1424 unsigned int offset
, parent_ino
;
1426 struct ext4_dir_entry_2
*de
;
1427 struct super_block
*sb
;
1428 struct inode
*inode
= file_inode(file
);
1429 int ret
, inline_size
= 0;
1430 struct ext4_iloc iloc
;
1431 void *dir_buf
= NULL
;
1432 int dotdot_offset
, dotdot_size
, extra_offset
, extra_size
;
1434 ret
= ext4_get_inode_loc(inode
, &iloc
);
1438 down_read(&EXT4_I(inode
)->xattr_sem
);
1439 if (!ext4_has_inline_data(inode
)) {
1440 up_read(&EXT4_I(inode
)->xattr_sem
);
1441 *has_inline_data
= 0;
1445 inline_size
= ext4_get_inline_size(inode
);
1446 dir_buf
= kmalloc(inline_size
, GFP_NOFS
);
1449 up_read(&EXT4_I(inode
)->xattr_sem
);
1453 ret
= ext4_read_inline_data(inode
, dir_buf
, inline_size
, &iloc
);
1454 up_read(&EXT4_I(inode
)->xattr_sem
);
1460 parent_ino
= le32_to_cpu(((struct ext4_dir_entry_2
*)dir_buf
)->inode
);
1464 * dotdot_offset and dotdot_size is the real offset and
1465 * size for ".." and "." if the dir is block based while
1466 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1467 * So we will use extra_offset and extra_size to indicate them
1468 * during the inline dir iteration.
1470 dotdot_offset
= EXT4_DIR_REC_LEN(1);
1471 dotdot_size
= dotdot_offset
+ EXT4_DIR_REC_LEN(2);
1472 extra_offset
= dotdot_size
- EXT4_INLINE_DOTDOT_SIZE
;
1473 extra_size
= extra_offset
+ inline_size
;
1476 * If the version has changed since the last call to
1477 * readdir(2), then we might be pointing to an invalid
1478 * dirent right now. Scan from the start of the inline
1481 if (file
->f_version
!= inode
->i_version
) {
1482 for (i
= 0; i
< extra_size
&& i
< offset
;) {
1484 * "." is with offset 0 and
1485 * ".." is dotdot_offset.
1490 } else if (i
== dotdot_offset
) {
1494 /* for other entry, the real offset in
1495 * the buf has to be tuned accordingly.
1497 de
= (struct ext4_dir_entry_2
*)
1498 (dir_buf
+ i
- extra_offset
);
1499 /* It's too expensive to do a full
1500 * dirent test each time round this
1501 * loop, but we do have to test at
1502 * least that it is non-zero. A
1503 * failure will be detected in the
1504 * dirent test below. */
1505 if (ext4_rec_len_from_disk(de
->rec_len
, extra_size
)
1506 < EXT4_DIR_REC_LEN(1))
1508 i
+= ext4_rec_len_from_disk(de
->rec_len
,
1513 file
->f_version
= inode
->i_version
;
1516 while (ctx
->pos
< extra_size
) {
1517 if (ctx
->pos
== 0) {
1518 if (!dir_emit(ctx
, ".", 1, inode
->i_ino
, DT_DIR
))
1520 ctx
->pos
= dotdot_offset
;
1524 if (ctx
->pos
== dotdot_offset
) {
1525 if (!dir_emit(ctx
, "..", 2, parent_ino
, DT_DIR
))
1527 ctx
->pos
= dotdot_size
;
1531 de
= (struct ext4_dir_entry_2
*)
1532 (dir_buf
+ ctx
->pos
- extra_offset
);
1533 if (ext4_check_dir_entry(inode
, file
, de
, iloc
.bh
, dir_buf
,
1534 extra_size
, ctx
->pos
))
1536 if (le32_to_cpu(de
->inode
)) {
1537 if (!dir_emit(ctx
, de
->name
, de
->name_len
,
1538 le32_to_cpu(de
->inode
),
1539 get_dtype(sb
, de
->file_type
)))
1542 ctx
->pos
+= ext4_rec_len_from_disk(de
->rec_len
, extra_size
);
1550 struct buffer_head
*ext4_get_first_inline_block(struct inode
*inode
,
1551 struct ext4_dir_entry_2
**parent_de
,
1554 struct ext4_iloc iloc
;
1556 *retval
= ext4_get_inode_loc(inode
, &iloc
);
1560 *parent_de
= (struct ext4_dir_entry_2
*)ext4_raw_inode(&iloc
)->i_block
;
1566 * Try to create the inline data for the new dir.
1567 * If it succeeds, return 0, otherwise return the error.
1568 * In case of ENOSPC, the caller should create the normal disk layout dir.
1570 int ext4_try_create_inline_dir(handle_t
*handle
, struct inode
*parent
,
1571 struct inode
*inode
)
1573 int ret
, inline_size
= EXT4_MIN_INLINE_DATA_SIZE
;
1574 struct ext4_iloc iloc
;
1575 struct ext4_dir_entry_2
*de
;
1577 ret
= ext4_get_inode_loc(inode
, &iloc
);
1581 ret
= ext4_prepare_inline_data(handle
, inode
, inline_size
);
1586 * For inline dir, we only save the inode information for the ".."
1587 * and create a fake dentry to cover the left space.
1589 de
= (struct ext4_dir_entry_2
*)ext4_raw_inode(&iloc
)->i_block
;
1590 de
->inode
= cpu_to_le32(parent
->i_ino
);
1591 de
= (struct ext4_dir_entry_2
*)((void *)de
+ EXT4_INLINE_DOTDOT_SIZE
);
1593 de
->rec_len
= ext4_rec_len_to_disk(
1594 inline_size
- EXT4_INLINE_DOTDOT_SIZE
,
1596 set_nlink(inode
, 2);
1597 inode
->i_size
= EXT4_I(inode
)->i_disksize
= inline_size
;
1603 struct buffer_head
*ext4_find_inline_entry(struct inode
*dir
,
1604 const struct qstr
*d_name
,
1605 struct ext4_dir_entry_2
**res_dir
,
1606 int *has_inline_data
)
1609 struct ext4_iloc iloc
;
1613 if (ext4_get_inode_loc(dir
, &iloc
))
1616 down_read(&EXT4_I(dir
)->xattr_sem
);
1617 if (!ext4_has_inline_data(dir
)) {
1618 *has_inline_data
= 0;
1622 inline_start
= (void *)ext4_raw_inode(&iloc
)->i_block
+
1623 EXT4_INLINE_DOTDOT_SIZE
;
1624 inline_size
= EXT4_MIN_INLINE_DATA_SIZE
- EXT4_INLINE_DOTDOT_SIZE
;
1625 ret
= search_dir(iloc
.bh
, inline_start
, inline_size
,
1626 dir
, d_name
, 0, res_dir
);
1632 if (ext4_get_inline_size(dir
) == EXT4_MIN_INLINE_DATA_SIZE
)
1635 inline_start
= ext4_get_inline_xattr_pos(dir
, &iloc
);
1636 inline_size
= ext4_get_inline_size(dir
) - EXT4_MIN_INLINE_DATA_SIZE
;
1638 ret
= search_dir(iloc
.bh
, inline_start
, inline_size
,
1639 dir
, d_name
, 0, res_dir
);
1647 up_read(&EXT4_I(dir
)->xattr_sem
);
1651 int ext4_delete_inline_entry(handle_t
*handle
,
1653 struct ext4_dir_entry_2
*de_del
,
1654 struct buffer_head
*bh
,
1655 int *has_inline_data
)
1657 int err
, inline_size
;
1658 struct ext4_iloc iloc
;
1661 err
= ext4_get_inode_loc(dir
, &iloc
);
1665 down_write(&EXT4_I(dir
)->xattr_sem
);
1666 if (!ext4_has_inline_data(dir
)) {
1667 *has_inline_data
= 0;
1671 if ((void *)de_del
- ((void *)ext4_raw_inode(&iloc
)->i_block
) <
1672 EXT4_MIN_INLINE_DATA_SIZE
) {
1673 inline_start
= (void *)ext4_raw_inode(&iloc
)->i_block
+
1674 EXT4_INLINE_DOTDOT_SIZE
;
1675 inline_size
= EXT4_MIN_INLINE_DATA_SIZE
-
1676 EXT4_INLINE_DOTDOT_SIZE
;
1678 inline_start
= ext4_get_inline_xattr_pos(dir
, &iloc
);
1679 inline_size
= ext4_get_inline_size(dir
) -
1680 EXT4_MIN_INLINE_DATA_SIZE
;
1683 BUFFER_TRACE(bh
, "get_write_access");
1684 err
= ext4_journal_get_write_access(handle
, bh
);
1688 err
= ext4_generic_delete_entry(handle
, dir
, de_del
, bh
,
1689 inline_start
, inline_size
, 0);
1693 BUFFER_TRACE(bh
, "call ext4_handle_dirty_metadata");
1694 err
= ext4_mark_inode_dirty(handle
, dir
);
1698 ext4_show_inline_dir(dir
, iloc
.bh
, inline_start
, inline_size
);
1700 up_write(&EXT4_I(dir
)->xattr_sem
);
1703 ext4_std_error(dir
->i_sb
, err
);
1708 * Get the inline dentry at offset.
1710 static inline struct ext4_dir_entry_2
*
1711 ext4_get_inline_entry(struct inode
*inode
,
1712 struct ext4_iloc
*iloc
,
1713 unsigned int offset
,
1714 void **inline_start
,
1719 BUG_ON(offset
> ext4_get_inline_size(inode
));
1721 if (offset
< EXT4_MIN_INLINE_DATA_SIZE
) {
1722 inline_pos
= (void *)ext4_raw_inode(iloc
)->i_block
;
1723 *inline_size
= EXT4_MIN_INLINE_DATA_SIZE
;
1725 inline_pos
= ext4_get_inline_xattr_pos(inode
, iloc
);
1726 offset
-= EXT4_MIN_INLINE_DATA_SIZE
;
1727 *inline_size
= ext4_get_inline_size(inode
) -
1728 EXT4_MIN_INLINE_DATA_SIZE
;
1732 *inline_start
= inline_pos
;
1733 return (struct ext4_dir_entry_2
*)(inline_pos
+ offset
);
1736 int empty_inline_dir(struct inode
*dir
, int *has_inline_data
)
1738 int err
, inline_size
;
1739 struct ext4_iloc iloc
;
1741 unsigned int offset
;
1742 struct ext4_dir_entry_2
*de
;
1745 err
= ext4_get_inode_loc(dir
, &iloc
);
1747 EXT4_ERROR_INODE(dir
, "error %d getting inode %lu block",
1752 down_read(&EXT4_I(dir
)->xattr_sem
);
1753 if (!ext4_has_inline_data(dir
)) {
1754 *has_inline_data
= 0;
1758 de
= (struct ext4_dir_entry_2
*)ext4_raw_inode(&iloc
)->i_block
;
1759 if (!le32_to_cpu(de
->inode
)) {
1760 ext4_warning(dir
->i_sb
,
1761 "bad inline directory (dir #%lu) - no `..'",
1767 offset
= EXT4_INLINE_DOTDOT_SIZE
;
1768 while (offset
< dir
->i_size
) {
1769 de
= ext4_get_inline_entry(dir
, &iloc
, offset
,
1770 &inline_pos
, &inline_size
);
1771 if (ext4_check_dir_entry(dir
, NULL
, de
,
1772 iloc
.bh
, inline_pos
,
1773 inline_size
, offset
)) {
1774 ext4_warning(dir
->i_sb
,
1775 "bad inline directory (dir #%lu) - "
1776 "inode %u, rec_len %u, name_len %d"
1778 dir
->i_ino
, le32_to_cpu(de
->inode
),
1779 le16_to_cpu(de
->rec_len
), de
->name_len
,
1784 if (le32_to_cpu(de
->inode
)) {
1788 offset
+= ext4_rec_len_from_disk(de
->rec_len
, inline_size
);
1792 up_read(&EXT4_I(dir
)->xattr_sem
);
1797 int ext4_destroy_inline_data(handle_t
*handle
, struct inode
*inode
)
1801 down_write(&EXT4_I(inode
)->xattr_sem
);
1802 ret
= ext4_destroy_inline_data_nolock(handle
, inode
);
1803 up_write(&EXT4_I(inode
)->xattr_sem
);
1808 int ext4_inline_data_fiemap(struct inode
*inode
,
1809 struct fiemap_extent_info
*fieinfo
,
1814 __u32 flags
= FIEMAP_EXTENT_DATA_INLINE
| FIEMAP_EXTENT_LAST
;
1816 struct ext4_iloc iloc
;
1818 down_read(&EXT4_I(inode
)->xattr_sem
);
1819 if (!ext4_has_inline_data(inode
)) {
1824 error
= ext4_get_inode_loc(inode
, &iloc
);
1828 physical
= (__u64
)iloc
.bh
->b_blocknr
<< inode
->i_sb
->s_blocksize_bits
;
1829 physical
+= (char *)ext4_raw_inode(&iloc
) - iloc
.bh
->b_data
;
1830 physical
+= offsetof(struct ext4_inode
, i_block
);
1831 length
= i_size_read(inode
);
1834 error
= fiemap_fill_next_extent(fieinfo
, 0, physical
,
1838 up_read(&EXT4_I(inode
)->xattr_sem
);
1839 return (error
< 0 ? error
: 0);
1843 * Called during xattr set, and if we can sparse space 'needed',
1844 * just create the extent tree evict the data to the outer block.
1846 * We use jbd2 instead of page cache to move data to the 1st block
1847 * so that the whole transaction can be committed as a whole and
1848 * the data isn't lost because of the delayed page cache write.
1850 int ext4_try_to_evict_inline_data(handle_t
*handle
,
1851 struct inode
*inode
,
1855 struct ext4_xattr_entry
*entry
;
1856 struct ext4_inode
*raw_inode
;
1857 struct ext4_iloc iloc
;
1859 error
= ext4_get_inode_loc(inode
, &iloc
);
1863 raw_inode
= ext4_raw_inode(&iloc
);
1864 entry
= (struct ext4_xattr_entry
*)((void *)raw_inode
+
1865 EXT4_I(inode
)->i_inline_off
);
1866 if (EXT4_XATTR_LEN(entry
->e_name_len
) +
1867 EXT4_XATTR_SIZE(le32_to_cpu(entry
->e_value_size
)) < needed
) {
1872 error
= ext4_convert_inline_data_nolock(handle
, inode
, &iloc
);
1878 void ext4_inline_data_truncate(struct inode
*inode
, int *has_inline
)
1881 int inline_size
, value_len
, needed_blocks
;
1884 struct ext4_xattr_ibody_find is
= {
1885 .s
= { .not_found
= -ENODATA
, },
1887 struct ext4_xattr_info i
= {
1888 .name_index
= EXT4_XATTR_INDEX_SYSTEM
,
1889 .name
= EXT4_XATTR_SYSTEM_DATA
,
1893 needed_blocks
= ext4_writepage_trans_blocks(inode
);
1894 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, needed_blocks
);
1898 down_write(&EXT4_I(inode
)->xattr_sem
);
1899 if (!ext4_has_inline_data(inode
)) {
1901 ext4_journal_stop(handle
);
1905 if (ext4_orphan_add(handle
, inode
))
1908 if (ext4_get_inode_loc(inode
, &is
.iloc
))
1911 down_write(&EXT4_I(inode
)->i_data_sem
);
1912 i_size
= inode
->i_size
;
1913 inline_size
= ext4_get_inline_size(inode
);
1914 EXT4_I(inode
)->i_disksize
= i_size
;
1916 if (i_size
< inline_size
) {
1917 /* Clear the content in the xattr space. */
1918 if (inline_size
> EXT4_MIN_INLINE_DATA_SIZE
) {
1919 if (ext4_xattr_ibody_find(inode
, &i
, &is
))
1922 BUG_ON(is
.s
.not_found
);
1924 value_len
= le32_to_cpu(is
.s
.here
->e_value_size
);
1925 value
= kmalloc(value_len
, GFP_NOFS
);
1929 if (ext4_xattr_ibody_get(inode
, i
.name_index
, i
.name
,
1934 i
.value_len
= i_size
> EXT4_MIN_INLINE_DATA_SIZE
?
1935 i_size
- EXT4_MIN_INLINE_DATA_SIZE
: 0;
1936 if (ext4_xattr_ibody_inline_set(handle
, inode
, &i
, &is
))
1940 /* Clear the content within i_blocks. */
1941 if (i_size
< EXT4_MIN_INLINE_DATA_SIZE
) {
1942 void *p
= (void *) ext4_raw_inode(&is
.iloc
)->i_block
;
1943 memset(p
+ i_size
, 0,
1944 EXT4_MIN_INLINE_DATA_SIZE
- i_size
);
1947 EXT4_I(inode
)->i_inline_size
= i_size
<
1948 EXT4_MIN_INLINE_DATA_SIZE
?
1949 EXT4_MIN_INLINE_DATA_SIZE
: i_size
;
1953 up_write(&EXT4_I(inode
)->i_data_sem
);
1956 up_write(&EXT4_I(inode
)->xattr_sem
);
1959 ext4_orphan_del(handle
, inode
);
1961 inode
->i_mtime
= inode
->i_ctime
= ext4_current_time(inode
);
1962 ext4_mark_inode_dirty(handle
, inode
);
1964 ext4_handle_sync(handle
);
1966 ext4_journal_stop(handle
);
1970 int ext4_convert_inline_data(struct inode
*inode
)
1972 int error
, needed_blocks
;
1974 struct ext4_iloc iloc
;
1976 if (!ext4_has_inline_data(inode
)) {
1977 ext4_clear_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
);
1981 needed_blocks
= ext4_writepage_trans_blocks(inode
);
1984 error
= ext4_get_inode_loc(inode
, &iloc
);
1988 handle
= ext4_journal_start(inode
, EXT4_HT_WRITE_PAGE
, needed_blocks
);
1989 if (IS_ERR(handle
)) {
1990 error
= PTR_ERR(handle
);
1994 down_write(&EXT4_I(inode
)->xattr_sem
);
1995 if (!ext4_has_inline_data(inode
)) {
1996 up_write(&EXT4_I(inode
)->xattr_sem
);
2000 error
= ext4_convert_inline_data_nolock(handle
, inode
, &iloc
);
2001 up_write(&EXT4_I(inode
)->xattr_sem
);
2003 ext4_journal_stop(handle
);