1 // SPDX-License-Identifier: LGPL-2.1
3 * Copyright (c) 2012 Taobao.
4 * Written by Tao Ma <boyu.mt@taobao.com>
7 #include <linux/iomap.h>
8 #include <linux/fiemap.h>
9 #include <linux/namei.h>
10 #include <linux/iversion.h>
11 #include <linux/sched/mm.h>
13 #include "ext4_jbd2.h"
18 #define EXT4_XATTR_SYSTEM_DATA "data"
19 #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS))
20 #define EXT4_INLINE_DOTDOT_OFFSET 2
21 #define EXT4_INLINE_DOTDOT_SIZE 4
23 static int ext4_get_inline_size(struct inode *inode)
25 if (EXT4_I(inode)->i_inline_off)
26 return EXT4_I(inode)->i_inline_size;
31 static int get_max_inline_xattr_value_size(struct inode *inode,
32 struct ext4_iloc *iloc)
34 struct ext4_xattr_ibody_header *header;
35 struct ext4_xattr_entry *entry;
36 struct ext4_inode *raw_inode;
40 if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
43 min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
44 EXT4_GOOD_OLD_INODE_SIZE -
45 EXT4_I(inode)->i_extra_isize -
46 sizeof(struct ext4_xattr_ibody_header);
49 * We need to subtract another sizeof(__u32) since an in-inode xattr
50 * needs an empty 4 bytes to indicate the gap between the xattr entry
51 * and the name/value pair.
53 if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
54 return EXT4_XATTR_SIZE(min_offs -
55 EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
56 EXT4_XATTR_ROUND - sizeof(__u32));
58 raw_inode = ext4_raw_inode(iloc);
59 header = IHDR(inode, raw_inode);
60 entry = IFIRST(header);
61 end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
63 /* Compute min_offs. */
64 while (!IS_LAST_ENTRY(entry)) {
65 void *next = EXT4_XATTR_NEXT(entry);
68 EXT4_ERROR_INODE(inode,
69 "corrupt xattr in inline inode");
72 if (!entry->e_value_inum && entry->e_value_size) {
73 size_t offs = le16_to_cpu(entry->e_value_offs);
80 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
82 if (EXT4_I(inode)->i_inline_off) {
83 entry = (struct ext4_xattr_entry *)
84 ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
86 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
90 free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
92 if (free > EXT4_XATTR_ROUND)
93 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
102 * Get the maximum size we now can store in an inode.
103 * If we can't find the space for a xattr entry, don't use the space
104 * of the extents since we have no space to indicate the inline data.
106 int ext4_get_max_inline_size(struct inode *inode)
108 int error, max_inline_size;
109 struct ext4_iloc iloc;
111 if (EXT4_I(inode)->i_extra_isize == 0)
114 error = ext4_get_inode_loc(inode, &iloc);
116 ext4_error_inode_err(inode, __func__, __LINE__, 0, -error,
117 "can't get inode location %lu",
122 down_read(&EXT4_I(inode)->xattr_sem);
123 max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
124 up_read(&EXT4_I(inode)->xattr_sem);
128 if (!max_inline_size)
131 return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
135 * this function does not take xattr_sem, which is OK because it is
136 * currently only used in a code path coming form ext4_iget, before
137 * the new inode has been unlocked
139 int ext4_find_inline_data_nolock(struct inode *inode)
141 struct ext4_xattr_ibody_find is = {
142 .s = { .not_found = -ENODATA, },
144 struct ext4_xattr_info i = {
145 .name_index = EXT4_XATTR_INDEX_SYSTEM,
146 .name = EXT4_XATTR_SYSTEM_DATA,
150 if (EXT4_I(inode)->i_extra_isize == 0)
153 error = ext4_get_inode_loc(inode, &is.iloc);
157 error = ext4_xattr_ibody_find(inode, &i, &is);
161 if (!is.s.not_found) {
162 if (is.s.here->e_value_inum) {
163 EXT4_ERROR_INODE(inode, "inline data xattr refers "
164 "to an external xattr inode");
165 error = -EFSCORRUPTED;
168 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
169 (void *)ext4_raw_inode(&is.iloc));
170 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
171 le32_to_cpu(is.s.here->e_value_size);
178 static int ext4_read_inline_data(struct inode *inode, void *buffer,
180 struct ext4_iloc *iloc)
182 struct ext4_xattr_entry *entry;
183 struct ext4_xattr_ibody_header *header;
185 struct ext4_inode *raw_inode;
190 BUG_ON(len > EXT4_I(inode)->i_inline_size);
192 cp_len = min_t(unsigned int, len, EXT4_MIN_INLINE_DATA_SIZE);
194 raw_inode = ext4_raw_inode(iloc);
195 memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
203 header = IHDR(inode, raw_inode);
204 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
205 EXT4_I(inode)->i_inline_off);
206 len = min_t(unsigned int, len,
207 (unsigned int)le32_to_cpu(entry->e_value_size));
210 (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
218 * write the buffer to the inline inode.
219 * If 'create' is set, we don't need to do the extra copy in the xattr
220 * value since it is already handled by ext4_xattr_ibody_set.
221 * That saves us one memcpy.
223 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
224 void *buffer, loff_t pos, unsigned int len)
226 struct ext4_xattr_entry *entry;
227 struct ext4_xattr_ibody_header *header;
228 struct ext4_inode *raw_inode;
231 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
234 BUG_ON(!EXT4_I(inode)->i_inline_off);
235 BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
237 raw_inode = ext4_raw_inode(iloc);
240 if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
241 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
242 EXT4_MIN_INLINE_DATA_SIZE - pos : len;
243 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
253 pos -= EXT4_MIN_INLINE_DATA_SIZE;
254 header = IHDR(inode, raw_inode);
255 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
256 EXT4_I(inode)->i_inline_off);
258 memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
262 static int ext4_create_inline_data(handle_t *handle,
263 struct inode *inode, unsigned len)
267 struct ext4_xattr_ibody_find is = {
268 .s = { .not_found = -ENODATA, },
270 struct ext4_xattr_info i = {
271 .name_index = EXT4_XATTR_INDEX_SYSTEM,
272 .name = EXT4_XATTR_SYSTEM_DATA,
275 error = ext4_get_inode_loc(inode, &is.iloc);
279 BUFFER_TRACE(is.iloc.bh, "get_write_access");
280 error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
285 if (len > EXT4_MIN_INLINE_DATA_SIZE) {
286 value = EXT4_ZERO_XATTR_VALUE;
287 len -= EXT4_MIN_INLINE_DATA_SIZE;
293 /* Insert the xttr entry. */
297 error = ext4_xattr_ibody_find(inode, &i, &is);
301 BUG_ON(!is.s.not_found);
303 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
305 if (error == -ENOSPC)
306 ext4_clear_inode_state(inode,
307 EXT4_STATE_MAY_INLINE_DATA);
311 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
312 0, EXT4_MIN_INLINE_DATA_SIZE);
314 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
315 (void *)ext4_raw_inode(&is.iloc));
316 EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
317 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
318 ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
320 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
327 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
332 struct ext4_xattr_ibody_find is = {
333 .s = { .not_found = -ENODATA, },
335 struct ext4_xattr_info i = {
336 .name_index = EXT4_XATTR_INDEX_SYSTEM,
337 .name = EXT4_XATTR_SYSTEM_DATA,
340 /* If the old space is ok, write the data directly. */
341 if (len <= EXT4_I(inode)->i_inline_size)
344 error = ext4_get_inode_loc(inode, &is.iloc);
348 error = ext4_xattr_ibody_find(inode, &i, &is);
352 BUG_ON(is.s.not_found);
354 len -= EXT4_MIN_INLINE_DATA_SIZE;
355 value = kzalloc(len, GFP_NOFS);
361 error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
366 BUFFER_TRACE(is.iloc.bh, "get_write_access");
367 error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
372 /* Update the xattr entry. */
376 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
380 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
381 (void *)ext4_raw_inode(&is.iloc));
382 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
383 le32_to_cpu(is.s.here->e_value_size);
384 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
386 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
394 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
397 int ret, size, no_expand;
398 struct ext4_inode_info *ei = EXT4_I(inode);
400 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
403 size = ext4_get_max_inline_size(inode);
407 ext4_write_lock_xattr(inode, &no_expand);
409 if (ei->i_inline_off)
410 ret = ext4_update_inline_data(handle, inode, len);
412 ret = ext4_create_inline_data(handle, inode, len);
414 ext4_write_unlock_xattr(inode, &no_expand);
418 static int ext4_destroy_inline_data_nolock(handle_t *handle,
421 struct ext4_inode_info *ei = EXT4_I(inode);
422 struct ext4_xattr_ibody_find is = {
423 .s = { .not_found = 0, },
425 struct ext4_xattr_info i = {
426 .name_index = EXT4_XATTR_INDEX_SYSTEM,
427 .name = EXT4_XATTR_SYSTEM_DATA,
433 if (!ei->i_inline_off)
436 error = ext4_get_inode_loc(inode, &is.iloc);
440 error = ext4_xattr_ibody_find(inode, &i, &is);
444 BUFFER_TRACE(is.iloc.bh, "get_write_access");
445 error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
450 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
454 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
455 0, EXT4_MIN_INLINE_DATA_SIZE);
456 memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
458 if (ext4_has_feature_extents(inode->i_sb)) {
459 if (S_ISDIR(inode->i_mode) ||
460 S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
461 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
462 ext4_ext_tree_init(handle, inode);
465 ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
468 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
470 EXT4_I(inode)->i_inline_off = 0;
471 EXT4_I(inode)->i_inline_size = 0;
472 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
475 if (error == -ENODATA)
480 static int ext4_read_inline_folio(struct inode *inode, struct folio *folio)
485 struct ext4_iloc iloc;
487 BUG_ON(!folio_test_locked(folio));
488 BUG_ON(!ext4_has_inline_data(inode));
489 BUG_ON(folio->index);
491 if (!EXT4_I(inode)->i_inline_off) {
492 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
497 ret = ext4_get_inode_loc(inode, &iloc);
501 len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
502 BUG_ON(len > PAGE_SIZE);
503 kaddr = kmap_local_folio(folio, 0);
504 ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
505 flush_dcache_folio(folio);
507 folio_zero_segment(folio, len, folio_size(folio));
508 folio_mark_uptodate(folio);
515 int ext4_readpage_inline(struct inode *inode, struct folio *folio)
519 down_read(&EXT4_I(inode)->xattr_sem);
520 if (!ext4_has_inline_data(inode)) {
521 up_read(&EXT4_I(inode)->xattr_sem);
526 * Current inline data can only exist in the 1st page,
527 * So for all the other pages, just set them uptodate.
530 ret = ext4_read_inline_folio(inode, folio);
531 else if (!folio_test_uptodate(folio)) {
532 folio_zero_segment(folio, 0, folio_size(folio));
533 folio_mark_uptodate(folio);
536 up_read(&EXT4_I(inode)->xattr_sem);
539 return ret >= 0 ? 0 : ret;
542 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
545 int ret, needed_blocks, no_expand;
546 handle_t *handle = NULL;
547 int retries = 0, sem_held = 0;
548 struct folio *folio = NULL;
550 struct ext4_iloc iloc;
552 if (!ext4_has_inline_data(inode)) {
554 * clear the flag so that no new write
555 * will trap here again.
557 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
561 needed_blocks = ext4_writepage_trans_blocks(inode);
563 ret = ext4_get_inode_loc(inode, &iloc);
568 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
569 if (IS_ERR(handle)) {
570 ret = PTR_ERR(handle);
575 /* We cannot recurse into the filesystem as the transaction is already
577 folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
578 mapping_gfp_mask(mapping));
580 ret = PTR_ERR(folio);
584 ext4_write_lock_xattr(inode, &no_expand);
586 /* If some one has already done this for us, just exit. */
587 if (!ext4_has_inline_data(inode)) {
593 to = ext4_get_inline_size(inode);
594 if (!folio_test_uptodate(folio)) {
595 ret = ext4_read_inline_folio(inode, folio);
600 ret = ext4_destroy_inline_data_nolock(handle, inode);
604 if (ext4_should_dioread_nolock(inode)) {
605 ret = __block_write_begin(&folio->page, from, to,
606 ext4_get_block_unwritten);
608 ret = __block_write_begin(&folio->page, from, to, ext4_get_block);
610 if (!ret && ext4_should_journal_data(inode)) {
611 ret = ext4_walk_page_buffers(handle, inode,
612 folio_buffers(folio), from, to,
613 NULL, do_journal_get_write_access);
620 ext4_orphan_add(handle, inode);
621 ext4_write_unlock_xattr(inode, &no_expand);
623 ext4_journal_stop(handle);
625 ext4_truncate_failed_write(inode);
627 * If truncate failed early the inode might
628 * still be on the orphan list; we need to
629 * make sure the inode is removed from the
630 * orphan list in that case.
633 ext4_orphan_del(NULL, inode);
636 if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
640 block_commit_write(&folio->page, from, to);
648 ext4_write_unlock_xattr(inode, &no_expand);
650 ext4_journal_stop(handle);
656 * Try to write data in the inode.
657 * If the inode has inline data, check whether the new write can be
658 * in the inode also. If not, create the page the handle, move the data
659 * to the page make it update and let the later codes create extent for it.
661 int ext4_try_to_write_inline_data(struct address_space *mapping,
663 loff_t pos, unsigned len,
669 struct ext4_iloc iloc;
671 if (pos + len > ext4_get_max_inline_size(inode))
674 ret = ext4_get_inode_loc(inode, &iloc);
679 * The possible write could happen in the inode,
680 * so try to reserve the space in inode first.
682 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
683 if (IS_ERR(handle)) {
684 ret = PTR_ERR(handle);
689 ret = ext4_prepare_inline_data(handle, inode, pos + len);
690 if (ret && ret != -ENOSPC)
693 /* We don't have space in inline inode, so convert it to extent. */
694 if (ret == -ENOSPC) {
695 ext4_journal_stop(handle);
700 ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
705 folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
706 mapping_gfp_mask(mapping));
708 ret = PTR_ERR(folio);
712 *pagep = &folio->page;
713 down_read(&EXT4_I(inode)->xattr_sem);
714 if (!ext4_has_inline_data(inode)) {
721 if (!folio_test_uptodate(folio)) {
722 ret = ext4_read_inline_folio(inode, folio);
733 up_read(&EXT4_I(inode)->xattr_sem);
735 if (handle && (ret != 1))
736 ext4_journal_stop(handle);
740 return ext4_convert_inline_data_to_extent(mapping, inode);
743 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
744 unsigned copied, struct folio *folio)
746 handle_t *handle = ext4_journal_current_handle();
749 struct ext4_iloc iloc;
752 if (unlikely(copied < len) && !folio_test_uptodate(folio))
755 if (likely(copied)) {
756 ret = ext4_get_inode_loc(inode, &iloc);
760 ext4_std_error(inode->i_sb, ret);
763 ext4_write_lock_xattr(inode, &no_expand);
764 BUG_ON(!ext4_has_inline_data(inode));
767 * ei->i_inline_off may have changed since
768 * ext4_write_begin() called
769 * ext4_try_to_write_inline_data()
771 (void) ext4_find_inline_data_nolock(inode);
773 kaddr = kmap_local_folio(folio, 0);
774 ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
776 folio_mark_uptodate(folio);
777 /* clear dirty flag so that writepages wouldn't work for us. */
778 folio_clear_dirty(folio);
780 ext4_write_unlock_xattr(inode, &no_expand);
784 * It's important to update i_size while still holding folio
785 * lock: page writeout could otherwise come in and zero
788 ext4_update_inode_size(inode, pos + copied);
794 * Don't mark the inode dirty under folio lock. First, it unnecessarily
795 * makes the holding time of folio lock longer. Second, it forces lock
796 * ordering of folio lock and transaction start for journaling
800 mark_inode_dirty(inode);
803 * If we didn't copy as much data as expected, we need to trim back
804 * size of xattr containing inline data.
806 if (pos + len > inode->i_size && ext4_can_truncate(inode))
807 ext4_orphan_add(handle, inode);
809 ret2 = ext4_journal_stop(handle);
812 if (pos + len > inode->i_size) {
813 ext4_truncate_failed_write(inode);
815 * If truncate failed early the inode might still be
816 * on the orphan list; we need to make sure the inode
817 * is removed from the orphan list in that case.
820 ext4_orphan_del(NULL, inode);
822 return ret ? ret : copied;
826 * Try to make the page cache and handle ready for the inline data case.
827 * We can call this function in 2 cases:
828 * 1. The inode is created and the first write exceeds inline size. We can
829 * clear the inode state safely.
830 * 2. The inode has inline data, then we need to read the data, make it
831 * update and dirty so that ext4_da_writepages can handle it. We don't
832 * need to start the journal since the file's metadata isn't changed now.
834 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
838 int ret = 0, inline_size;
841 folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN,
842 mapping_gfp_mask(mapping));
844 return PTR_ERR(folio);
846 down_read(&EXT4_I(inode)->xattr_sem);
847 if (!ext4_has_inline_data(inode)) {
848 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
852 inline_size = ext4_get_inline_size(inode);
854 if (!folio_test_uptodate(folio)) {
855 ret = ext4_read_inline_folio(inode, folio);
860 ret = __block_write_begin(&folio->page, 0, inline_size,
861 ext4_da_get_block_prep);
863 up_read(&EXT4_I(inode)->xattr_sem);
866 ext4_truncate_failed_write(inode);
870 folio_mark_dirty(folio);
871 folio_mark_uptodate(folio);
872 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
873 *fsdata = (void *)CONVERT_INLINE_DATA;
876 up_read(&EXT4_I(inode)->xattr_sem);
885 * Prepare the write for the inline data.
886 * If the data can be written into the inode, we just read
887 * the page and make it uptodate, and start the journal.
888 * Otherwise read the page, makes it dirty so that it can be
889 * handle in writepages(the i_disksize update is left to the
890 * normal ext4_da_write_end).
892 int ext4_da_write_inline_data_begin(struct address_space *mapping,
894 loff_t pos, unsigned len,
901 struct ext4_iloc iloc;
904 ret = ext4_get_inode_loc(inode, &iloc);
909 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
910 if (IS_ERR(handle)) {
911 ret = PTR_ERR(handle);
915 ret = ext4_prepare_inline_data(handle, inode, pos + len);
916 if (ret && ret != -ENOSPC)
919 if (ret == -ENOSPC) {
920 ext4_journal_stop(handle);
921 ret = ext4_da_convert_inline_data_to_extent(mapping,
924 if (ret == -ENOSPC &&
925 ext4_should_retry_alloc(inode->i_sb, &retries))
931 * We cannot recurse into the filesystem as the transaction
932 * is already started.
934 folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
935 mapping_gfp_mask(mapping));
937 ret = PTR_ERR(folio);
941 down_read(&EXT4_I(inode)->xattr_sem);
942 if (!ext4_has_inline_data(inode)) {
944 goto out_release_page;
947 if (!folio_test_uptodate(folio)) {
948 ret = ext4_read_inline_folio(inode, folio);
950 goto out_release_page;
952 ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
955 goto out_release_page;
957 up_read(&EXT4_I(inode)->xattr_sem);
958 *pagep = &folio->page;
962 up_read(&EXT4_I(inode)->xattr_sem);
966 ext4_journal_stop(handle);
972 #ifdef INLINE_DIR_DEBUG
973 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
974 void *inline_start, int inline_size)
977 unsigned short de_len;
978 struct ext4_dir_entry_2 *de = inline_start;
979 void *dlimit = inline_start + inline_size;
981 trace_printk("inode %lu\n", dir->i_ino);
983 while ((void *)de < dlimit) {
984 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
985 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
986 offset, de_len, de->name_len, de->name,
987 de->name_len, le32_to_cpu(de->inode));
988 if (ext4_check_dir_entry(dir, NULL, de, bh,
989 inline_start, inline_size, offset))
993 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
997 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1001 * Add a new entry into a inline dir.
1002 * It will return -ENOSPC if no space is available, and -EIO
1003 * and -EEXIST if directory entry already exists.
1005 static int ext4_add_dirent_to_inline(handle_t *handle,
1006 struct ext4_filename *fname,
1008 struct inode *inode,
1009 struct ext4_iloc *iloc,
1010 void *inline_start, int inline_size)
1013 struct ext4_dir_entry_2 *de;
1015 err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1016 inline_size, fname, &de);
1020 BUFFER_TRACE(iloc->bh, "get_write_access");
1021 err = ext4_journal_get_write_access(handle, dir->i_sb, iloc->bh,
1025 ext4_insert_dentry(dir, inode, de, inline_size, fname);
1027 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1030 * XXX shouldn't update any times until successful
1031 * completion of syscall, but too many callers depend
1034 * XXX similarly, too many callers depend on
1035 * ext4_new_inode() setting the times, but error
1036 * recovery deletes the inode, so the worst that can
1037 * happen is that the times are slightly out of date
1038 * and/or different from the directory change time.
1040 dir->i_mtime = inode_set_ctime_current(dir);
1041 ext4_update_dx_flag(dir);
1042 inode_inc_iversion(dir);
1046 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1047 struct ext4_iloc *iloc)
1049 struct ext4_xattr_entry *entry;
1050 struct ext4_xattr_ibody_header *header;
1052 BUG_ON(!EXT4_I(inode)->i_inline_off);
1054 header = IHDR(inode, ext4_raw_inode(iloc));
1055 entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1056 EXT4_I(inode)->i_inline_off);
1058 return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1061 /* Set the final de to cover the whole block. */
1062 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1064 struct ext4_dir_entry_2 *de, *prev_de;
1070 limit = de_buf + old_size;
1073 de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1076 } while (de_buf < limit);
1078 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1079 old_size, new_size);
1081 /* this is just created, so create an empty entry. */
1083 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1087 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1088 struct ext4_iloc *iloc)
1091 int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1092 int new_size = get_max_inline_xattr_value_size(dir, iloc);
1094 if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1097 ret = ext4_update_inline_data(handle, dir,
1098 new_size + EXT4_MIN_INLINE_DATA_SIZE);
1102 ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1103 EXT4_I(dir)->i_inline_size -
1104 EXT4_MIN_INLINE_DATA_SIZE);
1105 dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1109 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1110 struct ext4_iloc *iloc,
1111 void *buf, int inline_size)
1115 ret = ext4_create_inline_data(handle, inode, inline_size);
1117 ext4_msg(inode->i_sb, KERN_EMERG,
1118 "error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1122 ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1123 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1126 static int ext4_finish_convert_inline_dir(handle_t *handle,
1127 struct inode *inode,
1128 struct buffer_head *dir_block,
1132 int err, csum_size = 0, header_size = 0;
1133 struct ext4_dir_entry_2 *de;
1134 void *target = dir_block->b_data;
1137 * First create "." and ".." and then copy the dir information
1138 * back to the block.
1141 de = ext4_init_dot_dotdot(inode, de,
1142 inode->i_sb->s_blocksize, csum_size,
1143 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1144 header_size = (void *)de - target;
1146 memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1147 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1149 if (ext4_has_metadata_csum(inode->i_sb))
1150 csum_size = sizeof(struct ext4_dir_entry_tail);
1152 inode->i_size = inode->i_sb->s_blocksize;
1153 i_size_write(inode, inode->i_sb->s_blocksize);
1154 EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1155 ext4_update_final_de(dir_block->b_data,
1156 inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1157 inode->i_sb->s_blocksize - csum_size);
1160 ext4_initialize_dirent_tail(dir_block,
1161 inode->i_sb->s_blocksize);
1162 set_buffer_uptodate(dir_block);
1163 unlock_buffer(dir_block);
1164 err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1167 set_buffer_verified(dir_block);
1168 return ext4_mark_inode_dirty(handle, inode);
1171 static int ext4_convert_inline_data_nolock(handle_t *handle,
1172 struct inode *inode,
1173 struct ext4_iloc *iloc)
1177 struct buffer_head *data_bh = NULL;
1178 struct ext4_map_blocks map;
1181 inline_size = ext4_get_inline_size(inode);
1182 buf = kmalloc(inline_size, GFP_NOFS);
1188 error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1193 * Make sure the inline directory entries pass checks before we try to
1194 * convert them, so that we avoid touching stuff that needs fsck.
1196 if (S_ISDIR(inode->i_mode)) {
1197 error = ext4_check_all_de(inode, iloc->bh,
1198 buf + EXT4_INLINE_DOTDOT_SIZE,
1199 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1204 error = ext4_destroy_inline_data_nolock(handle, inode);
1211 error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1214 if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1219 data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1225 lock_buffer(data_bh);
1226 error = ext4_journal_get_create_access(handle, inode->i_sb, data_bh,
1229 unlock_buffer(data_bh);
1233 memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1235 if (!S_ISDIR(inode->i_mode)) {
1236 memcpy(data_bh->b_data, buf, inline_size);
1237 set_buffer_uptodate(data_bh);
1238 unlock_buffer(data_bh);
1239 error = ext4_handle_dirty_metadata(handle,
1242 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1248 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1257 * Try to add the new entry to the inline data.
1258 * If succeeds, return 0. If not, extended the inline dir and copied data to
1259 * the new created block.
1261 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1262 struct inode *dir, struct inode *inode)
1264 int ret, ret2, inline_size, no_expand;
1266 struct ext4_iloc iloc;
1268 ret = ext4_get_inode_loc(dir, &iloc);
1272 ext4_write_lock_xattr(dir, &no_expand);
1273 if (!ext4_has_inline_data(dir))
1276 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1277 EXT4_INLINE_DOTDOT_SIZE;
1278 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1280 ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1281 inline_start, inline_size);
1285 /* check whether it can be inserted to inline xattr space. */
1286 inline_size = EXT4_I(dir)->i_inline_size -
1287 EXT4_MIN_INLINE_DATA_SIZE;
1289 /* Try to use the xattr space.*/
1290 ret = ext4_update_inline_dir(handle, dir, &iloc);
1291 if (ret && ret != -ENOSPC)
1294 inline_size = EXT4_I(dir)->i_inline_size -
1295 EXT4_MIN_INLINE_DATA_SIZE;
1299 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1301 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1302 inode, &iloc, inline_start,
1310 * The inline space is filled up, so create a new block for it.
1311 * As the extent tree will be created, we have to save the inline
1314 ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1317 ext4_write_unlock_xattr(dir, &no_expand);
1318 ret2 = ext4_mark_inode_dirty(handle, dir);
1319 if (unlikely(ret2 && !ret))
1326 * This function fills a red-black tree with information from an
1327 * inlined dir. It returns the number directory entries loaded
1328 * into the tree. If there is an error it is returned in err.
1330 int ext4_inlinedir_to_tree(struct file *dir_file,
1331 struct inode *dir, ext4_lblk_t block,
1332 struct dx_hash_info *hinfo,
1333 __u32 start_hash, __u32 start_minor_hash,
1334 int *has_inline_data)
1336 int err = 0, count = 0;
1337 unsigned int parent_ino;
1339 struct ext4_dir_entry_2 *de;
1340 struct inode *inode = file_inode(dir_file);
1341 int ret, inline_size = 0;
1342 struct ext4_iloc iloc;
1343 void *dir_buf = NULL;
1344 struct ext4_dir_entry_2 fake;
1345 struct fscrypt_str tmp_str;
1347 ret = ext4_get_inode_loc(inode, &iloc);
1351 down_read(&EXT4_I(inode)->xattr_sem);
1352 if (!ext4_has_inline_data(inode)) {
1353 up_read(&EXT4_I(inode)->xattr_sem);
1354 *has_inline_data = 0;
1358 inline_size = ext4_get_inline_size(inode);
1359 dir_buf = kmalloc(inline_size, GFP_NOFS);
1362 up_read(&EXT4_I(inode)->xattr_sem);
1366 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1367 up_read(&EXT4_I(inode)->xattr_sem);
1372 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1373 while (pos < inline_size) {
1375 * As inlined dir doesn't store any information about '.' and
1376 * only the inode number of '..' is stored, we have to handle
1380 fake.inode = cpu_to_le32(inode->i_ino);
1382 strcpy(fake.name, ".");
1383 fake.rec_len = ext4_rec_len_to_disk(
1384 ext4_dir_rec_len(fake.name_len, NULL),
1386 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1388 pos = EXT4_INLINE_DOTDOT_OFFSET;
1389 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1390 fake.inode = cpu_to_le32(parent_ino);
1392 strcpy(fake.name, "..");
1393 fake.rec_len = ext4_rec_len_to_disk(
1394 ext4_dir_rec_len(fake.name_len, NULL),
1396 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1398 pos = EXT4_INLINE_DOTDOT_SIZE;
1400 de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1401 pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1402 if (ext4_check_dir_entry(inode, dir_file, de,
1404 inline_size, pos)) {
1410 if (ext4_hash_in_dirent(dir)) {
1411 hinfo->hash = EXT4_DIRENT_HASH(de);
1412 hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1414 ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1416 if ((hinfo->hash < start_hash) ||
1417 ((hinfo->hash == start_hash) &&
1418 (hinfo->minor_hash < start_minor_hash)))
1422 tmp_str.name = de->name;
1423 tmp_str.len = de->name_len;
1424 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1425 hinfo->minor_hash, de, &tmp_str);
1440 * So this function is called when the volume is mkfsed with
1441 * dir_index disabled. In order to keep f_pos persistent
1442 * after we convert from an inlined dir to a blocked based,
1443 * we just pretend that we are a normal dir and return the
1444 * offset as if '.' and '..' really take place.
1447 int ext4_read_inline_dir(struct file *file,
1448 struct dir_context *ctx,
1449 int *has_inline_data)
1451 unsigned int offset, parent_ino;
1453 struct ext4_dir_entry_2 *de;
1454 struct super_block *sb;
1455 struct inode *inode = file_inode(file);
1456 int ret, inline_size = 0;
1457 struct ext4_iloc iloc;
1458 void *dir_buf = NULL;
1459 int dotdot_offset, dotdot_size, extra_offset, extra_size;
1461 ret = ext4_get_inode_loc(inode, &iloc);
1465 down_read(&EXT4_I(inode)->xattr_sem);
1466 if (!ext4_has_inline_data(inode)) {
1467 up_read(&EXT4_I(inode)->xattr_sem);
1468 *has_inline_data = 0;
1472 inline_size = ext4_get_inline_size(inode);
1473 dir_buf = kmalloc(inline_size, GFP_NOFS);
1476 up_read(&EXT4_I(inode)->xattr_sem);
1480 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1481 up_read(&EXT4_I(inode)->xattr_sem);
1487 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1491 * dotdot_offset and dotdot_size is the real offset and
1492 * size for ".." and "." if the dir is block based while
1493 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1494 * So we will use extra_offset and extra_size to indicate them
1495 * during the inline dir iteration.
1497 dotdot_offset = ext4_dir_rec_len(1, NULL);
1498 dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1499 extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1500 extra_size = extra_offset + inline_size;
1503 * If the version has changed since the last call to
1504 * readdir(2), then we might be pointing to an invalid
1505 * dirent right now. Scan from the start of the inline
1508 if (!inode_eq_iversion(inode, file->f_version)) {
1509 for (i = 0; i < extra_size && i < offset;) {
1511 * "." is with offset 0 and
1512 * ".." is dotdot_offset.
1517 } else if (i == dotdot_offset) {
1521 /* for other entry, the real offset in
1522 * the buf has to be tuned accordingly.
1524 de = (struct ext4_dir_entry_2 *)
1525 (dir_buf + i - extra_offset);
1526 /* It's too expensive to do a full
1527 * dirent test each time round this
1528 * loop, but we do have to test at
1529 * least that it is non-zero. A
1530 * failure will be detected in the
1531 * dirent test below. */
1532 if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1533 < ext4_dir_rec_len(1, NULL))
1535 i += ext4_rec_len_from_disk(de->rec_len,
1540 file->f_version = inode_query_iversion(inode);
1543 while (ctx->pos < extra_size) {
1544 if (ctx->pos == 0) {
1545 if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1547 ctx->pos = dotdot_offset;
1551 if (ctx->pos == dotdot_offset) {
1552 if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1554 ctx->pos = dotdot_size;
1558 de = (struct ext4_dir_entry_2 *)
1559 (dir_buf + ctx->pos - extra_offset);
1560 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1561 extra_size, ctx->pos))
1563 if (le32_to_cpu(de->inode)) {
1564 if (!dir_emit(ctx, de->name, de->name_len,
1565 le32_to_cpu(de->inode),
1566 get_dtype(sb, de->file_type)))
1569 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1577 void *ext4_read_inline_link(struct inode *inode)
1579 struct ext4_iloc iloc;
1580 int ret, inline_size;
1583 ret = ext4_get_inode_loc(inode, &iloc);
1585 return ERR_PTR(ret);
1588 inline_size = ext4_get_inline_size(inode);
1589 link = kmalloc(inline_size + 1, GFP_NOFS);
1593 ret = ext4_read_inline_data(inode, link, inline_size, &iloc);
1598 nd_terminate_link(link, inode->i_size, ret);
1601 link = ERR_PTR(ret);
1606 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1607 struct ext4_dir_entry_2 **parent_de,
1610 struct ext4_iloc iloc;
1612 *retval = ext4_get_inode_loc(inode, &iloc);
1616 *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1622 * Try to create the inline data for the new dir.
1623 * If it succeeds, return 0, otherwise return the error.
1624 * In case of ENOSPC, the caller should create the normal disk layout dir.
1626 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1627 struct inode *inode)
1629 int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1630 struct ext4_iloc iloc;
1631 struct ext4_dir_entry_2 *de;
1633 ret = ext4_get_inode_loc(inode, &iloc);
1637 ret = ext4_prepare_inline_data(handle, inode, inline_size);
1642 * For inline dir, we only save the inode information for the ".."
1643 * and create a fake dentry to cover the left space.
1645 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1646 de->inode = cpu_to_le32(parent->i_ino);
1647 de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1649 de->rec_len = ext4_rec_len_to_disk(
1650 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1652 set_nlink(inode, 2);
1653 inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1659 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1660 struct ext4_filename *fname,
1661 struct ext4_dir_entry_2 **res_dir,
1662 int *has_inline_data)
1665 struct ext4_iloc iloc;
1669 if (ext4_get_inode_loc(dir, &iloc))
1672 down_read(&EXT4_I(dir)->xattr_sem);
1673 if (!ext4_has_inline_data(dir)) {
1674 *has_inline_data = 0;
1678 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1679 EXT4_INLINE_DOTDOT_SIZE;
1680 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1681 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1682 dir, fname, 0, res_dir);
1688 if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1691 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1692 inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1694 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1695 dir, fname, 0, res_dir);
1703 up_read(&EXT4_I(dir)->xattr_sem);
1707 int ext4_delete_inline_entry(handle_t *handle,
1709 struct ext4_dir_entry_2 *de_del,
1710 struct buffer_head *bh,
1711 int *has_inline_data)
1713 int err, inline_size, no_expand;
1714 struct ext4_iloc iloc;
1717 err = ext4_get_inode_loc(dir, &iloc);
1721 ext4_write_lock_xattr(dir, &no_expand);
1722 if (!ext4_has_inline_data(dir)) {
1723 *has_inline_data = 0;
1727 if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1728 EXT4_MIN_INLINE_DATA_SIZE) {
1729 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1730 EXT4_INLINE_DOTDOT_SIZE;
1731 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1732 EXT4_INLINE_DOTDOT_SIZE;
1734 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1735 inline_size = ext4_get_inline_size(dir) -
1736 EXT4_MIN_INLINE_DATA_SIZE;
1739 BUFFER_TRACE(bh, "get_write_access");
1740 err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
1745 err = ext4_generic_delete_entry(dir, de_del, bh,
1746 inline_start, inline_size, 0);
1750 ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1752 ext4_write_unlock_xattr(dir, &no_expand);
1753 if (likely(err == 0))
1754 err = ext4_mark_inode_dirty(handle, dir);
1757 ext4_std_error(dir->i_sb, err);
1762 * Get the inline dentry at offset.
1764 static inline struct ext4_dir_entry_2 *
1765 ext4_get_inline_entry(struct inode *inode,
1766 struct ext4_iloc *iloc,
1767 unsigned int offset,
1768 void **inline_start,
1773 BUG_ON(offset > ext4_get_inline_size(inode));
1775 if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1776 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1777 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1779 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1780 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1781 *inline_size = ext4_get_inline_size(inode) -
1782 EXT4_MIN_INLINE_DATA_SIZE;
1786 *inline_start = inline_pos;
1787 return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1790 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1792 int err, inline_size;
1793 struct ext4_iloc iloc;
1796 unsigned int offset;
1797 struct ext4_dir_entry_2 *de;
1800 err = ext4_get_inode_loc(dir, &iloc);
1802 EXT4_ERROR_INODE_ERR(dir, -err,
1803 "error %d getting inode %lu block",
1808 down_read(&EXT4_I(dir)->xattr_sem);
1809 if (!ext4_has_inline_data(dir)) {
1810 *has_inline_data = 0;
1815 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1816 if (!le32_to_cpu(de->inode)) {
1817 ext4_warning(dir->i_sb,
1818 "bad inline directory (dir #%lu) - no `..'",
1823 inline_len = ext4_get_inline_size(dir);
1824 offset = EXT4_INLINE_DOTDOT_SIZE;
1825 while (offset < inline_len) {
1826 de = ext4_get_inline_entry(dir, &iloc, offset,
1827 &inline_pos, &inline_size);
1828 if (ext4_check_dir_entry(dir, NULL, de,
1829 iloc.bh, inline_pos,
1830 inline_size, offset)) {
1831 ext4_warning(dir->i_sb,
1832 "bad inline directory (dir #%lu) - "
1833 "inode %u, rec_len %u, name_len %d"
1835 dir->i_ino, le32_to_cpu(de->inode),
1836 le16_to_cpu(de->rec_len), de->name_len,
1840 if (le32_to_cpu(de->inode)) {
1843 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1848 up_read(&EXT4_I(dir)->xattr_sem);
1853 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1857 ext4_write_lock_xattr(inode, &no_expand);
1858 ret = ext4_destroy_inline_data_nolock(handle, inode);
1859 ext4_write_unlock_xattr(inode, &no_expand);
1864 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1867 int error = -EAGAIN;
1868 struct ext4_iloc iloc;
1870 down_read(&EXT4_I(inode)->xattr_sem);
1871 if (!ext4_has_inline_data(inode))
1874 error = ext4_get_inode_loc(inode, &iloc);
1878 addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1879 addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1880 addr += offsetof(struct ext4_inode, i_block);
1886 iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1887 i_size_read(inode));
1888 iomap->type = IOMAP_INLINE;
1892 up_read(&EXT4_I(inode)->xattr_sem);
1896 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1899 int inline_size, value_len, needed_blocks, no_expand, err = 0;
1902 struct ext4_xattr_ibody_find is = {
1903 .s = { .not_found = -ENODATA, },
1905 struct ext4_xattr_info i = {
1906 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1907 .name = EXT4_XATTR_SYSTEM_DATA,
1911 needed_blocks = ext4_writepage_trans_blocks(inode);
1912 handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1914 return PTR_ERR(handle);
1916 ext4_write_lock_xattr(inode, &no_expand);
1917 if (!ext4_has_inline_data(inode)) {
1918 ext4_write_unlock_xattr(inode, &no_expand);
1920 ext4_journal_stop(handle);
1924 if ((err = ext4_orphan_add(handle, inode)) != 0)
1927 if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1930 down_write(&EXT4_I(inode)->i_data_sem);
1931 i_size = inode->i_size;
1932 inline_size = ext4_get_inline_size(inode);
1933 EXT4_I(inode)->i_disksize = i_size;
1935 if (i_size < inline_size) {
1937 * if there's inline data to truncate and this file was
1938 * converted to extents after that inline data was written,
1939 * the extent status cache must be cleared to avoid leaving
1940 * behind stale delayed allocated extent entries
1942 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
1943 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1945 /* Clear the content in the xattr space. */
1946 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1947 if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1950 BUG_ON(is.s.not_found);
1952 value_len = le32_to_cpu(is.s.here->e_value_size);
1953 value = kmalloc(value_len, GFP_NOFS);
1959 err = ext4_xattr_ibody_get(inode, i.name_index,
1960 i.name, value, value_len);
1965 i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1966 i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1967 err = ext4_xattr_ibody_set(handle, inode, &i, &is);
1972 /* Clear the content within i_blocks. */
1973 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1974 void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1975 memset(p + i_size, 0,
1976 EXT4_MIN_INLINE_DATA_SIZE - i_size);
1979 EXT4_I(inode)->i_inline_size = i_size <
1980 EXT4_MIN_INLINE_DATA_SIZE ?
1981 EXT4_MIN_INLINE_DATA_SIZE : i_size;
1985 up_write(&EXT4_I(inode)->i_data_sem);
1988 ext4_write_unlock_xattr(inode, &no_expand);
1991 ext4_orphan_del(handle, inode);
1994 inode->i_mtime = inode_set_ctime_current(inode);
1995 err = ext4_mark_inode_dirty(handle, inode);
1997 ext4_handle_sync(handle);
1999 ext4_journal_stop(handle);
2003 int ext4_convert_inline_data(struct inode *inode)
2005 int error, needed_blocks, no_expand;
2007 struct ext4_iloc iloc;
2009 if (!ext4_has_inline_data(inode)) {
2010 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2012 } else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
2014 * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
2015 * cleared. This means we are in the middle of moving of
2016 * inline data to delay allocated block. Just force writeout
2017 * here to finish conversion.
2019 error = filemap_flush(inode->i_mapping);
2022 if (!ext4_has_inline_data(inode))
2026 needed_blocks = ext4_writepage_trans_blocks(inode);
2029 error = ext4_get_inode_loc(inode, &iloc);
2033 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2034 if (IS_ERR(handle)) {
2035 error = PTR_ERR(handle);
2039 ext4_write_lock_xattr(inode, &no_expand);
2040 if (ext4_has_inline_data(inode))
2041 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2042 ext4_write_unlock_xattr(inode, &no_expand);
2043 ext4_journal_stop(handle);