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;
123 int ext4_has_inline_data(struct inode *inode)
125 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
126 EXT4_I(inode)->i_inline_off;
130 * this function does not take xattr_sem, which is OK because it is
131 * currently only used in a code path coming form ext4_iget, before
132 * the new inode has been unlocked
134 int ext4_find_inline_data_nolock(struct inode *inode)
136 struct ext4_xattr_ibody_find is = {
137 .s = { .not_found = -ENODATA, },
139 struct ext4_xattr_info i = {
140 .name_index = EXT4_XATTR_INDEX_SYSTEM,
141 .name = EXT4_XATTR_SYSTEM_DATA,
145 if (EXT4_I(inode)->i_extra_isize == 0)
148 error = ext4_get_inode_loc(inode, &is.iloc);
152 error = ext4_xattr_ibody_find(inode, &i, &is);
156 if (!is.s.not_found) {
157 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
158 (void *)ext4_raw_inode(&is.iloc));
159 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
160 le32_to_cpu(is.s.here->e_value_size);
161 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
168 static int ext4_read_inline_data(struct inode *inode, void *buffer,
170 struct ext4_iloc *iloc)
172 struct ext4_xattr_entry *entry;
173 struct ext4_xattr_ibody_header *header;
175 struct ext4_inode *raw_inode;
180 BUG_ON(len > EXT4_I(inode)->i_inline_size);
182 cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
183 len : EXT4_MIN_INLINE_DATA_SIZE;
185 raw_inode = ext4_raw_inode(iloc);
186 memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
194 header = IHDR(inode, raw_inode);
195 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
196 EXT4_I(inode)->i_inline_off);
197 len = min_t(unsigned int, len,
198 (unsigned int)le32_to_cpu(entry->e_value_size));
201 (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
209 * write the buffer to the inline inode.
210 * If 'create' is set, we don't need to do the extra copy in the xattr
211 * value since it is already handled by ext4_xattr_ibody_inline_set.
212 * That saves us one memcpy.
214 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
215 void *buffer, loff_t pos, unsigned int len)
217 struct ext4_xattr_entry *entry;
218 struct ext4_xattr_ibody_header *header;
219 struct ext4_inode *raw_inode;
222 BUG_ON(!EXT4_I(inode)->i_inline_off);
223 BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
225 raw_inode = ext4_raw_inode(iloc);
228 if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
229 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
230 EXT4_MIN_INLINE_DATA_SIZE - pos : len;
231 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
241 pos -= EXT4_MIN_INLINE_DATA_SIZE;
242 header = IHDR(inode, raw_inode);
243 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
244 EXT4_I(inode)->i_inline_off);
246 memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
250 static int ext4_create_inline_data(handle_t *handle,
251 struct inode *inode, unsigned len)
255 struct ext4_xattr_ibody_find is = {
256 .s = { .not_found = -ENODATA, },
258 struct ext4_xattr_info i = {
259 .name_index = EXT4_XATTR_INDEX_SYSTEM,
260 .name = EXT4_XATTR_SYSTEM_DATA,
263 error = ext4_get_inode_loc(inode, &is.iloc);
267 BUFFER_TRACE(is.iloc.bh, "get_write_access");
268 error = ext4_journal_get_write_access(handle, is.iloc.bh);
272 if (len > EXT4_MIN_INLINE_DATA_SIZE) {
273 value = EXT4_ZERO_XATTR_VALUE;
274 len -= EXT4_MIN_INLINE_DATA_SIZE;
280 /* Insert the the xttr entry. */
284 error = ext4_xattr_ibody_find(inode, &i, &is);
288 BUG_ON(!is.s.not_found);
290 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
292 if (error == -ENOSPC)
293 ext4_clear_inode_state(inode,
294 EXT4_STATE_MAY_INLINE_DATA);
298 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
299 0, EXT4_MIN_INLINE_DATA_SIZE);
301 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
302 (void *)ext4_raw_inode(&is.iloc));
303 EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
304 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
305 ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
307 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
314 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
319 struct ext4_xattr_ibody_find is = {
320 .s = { .not_found = -ENODATA, },
322 struct ext4_xattr_info i = {
323 .name_index = EXT4_XATTR_INDEX_SYSTEM,
324 .name = EXT4_XATTR_SYSTEM_DATA,
327 /* If the old space is ok, write the data directly. */
328 if (len <= EXT4_I(inode)->i_inline_size)
331 error = ext4_get_inode_loc(inode, &is.iloc);
335 error = ext4_xattr_ibody_find(inode, &i, &is);
339 BUG_ON(is.s.not_found);
341 len -= EXT4_MIN_INLINE_DATA_SIZE;
342 value = kzalloc(len, GFP_NOFS);
346 error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
348 if (error == -ENODATA)
351 BUFFER_TRACE(is.iloc.bh, "get_write_access");
352 error = ext4_journal_get_write_access(handle, is.iloc.bh);
356 /* Update the xttr entry. */
360 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
364 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
365 (void *)ext4_raw_inode(&is.iloc));
366 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
367 le32_to_cpu(is.s.here->e_value_size);
368 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
370 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
378 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
382 struct ext4_inode_info *ei = EXT4_I(inode);
384 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
387 size = ext4_get_max_inline_size(inode);
391 down_write(&EXT4_I(inode)->xattr_sem);
393 if (ei->i_inline_off)
394 ret = ext4_update_inline_data(handle, inode, len);
396 ret = ext4_create_inline_data(handle, inode, len);
398 up_write(&EXT4_I(inode)->xattr_sem);
403 static int ext4_destroy_inline_data_nolock(handle_t *handle,
406 struct ext4_inode_info *ei = EXT4_I(inode);
407 struct ext4_xattr_ibody_find is = {
408 .s = { .not_found = 0, },
410 struct ext4_xattr_info i = {
411 .name_index = EXT4_XATTR_INDEX_SYSTEM,
412 .name = EXT4_XATTR_SYSTEM_DATA,
418 if (!ei->i_inline_off)
421 error = ext4_get_inode_loc(inode, &is.iloc);
425 error = ext4_xattr_ibody_find(inode, &i, &is);
429 BUFFER_TRACE(is.iloc.bh, "get_write_access");
430 error = ext4_journal_get_write_access(handle, is.iloc.bh);
434 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
438 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
439 0, EXT4_MIN_INLINE_DATA_SIZE);
441 if (EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
442 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
443 if (S_ISDIR(inode->i_mode) ||
444 S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
445 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
446 ext4_ext_tree_init(handle, inode);
449 ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
452 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
454 EXT4_I(inode)->i_inline_off = 0;
455 EXT4_I(inode)->i_inline_size = 0;
456 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
459 if (error == -ENODATA)
464 static int ext4_read_inline_page(struct inode *inode, struct page *page)
469 struct ext4_iloc iloc;
471 BUG_ON(!PageLocked(page));
472 BUG_ON(!ext4_has_inline_data(inode));
475 if (!EXT4_I(inode)->i_inline_off) {
476 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
481 ret = ext4_get_inode_loc(inode, &iloc);
485 len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
486 kaddr = kmap_atomic(page);
487 ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
488 flush_dcache_page(page);
489 kunmap_atomic(kaddr);
490 zero_user_segment(page, len, PAGE_CACHE_SIZE);
491 SetPageUptodate(page);
498 int ext4_readpage_inline(struct inode *inode, struct page *page)
502 down_read(&EXT4_I(inode)->xattr_sem);
503 if (!ext4_has_inline_data(inode)) {
504 up_read(&EXT4_I(inode)->xattr_sem);
509 * Current inline data can only exist in the 1st page,
510 * So for all the other pages, just set them uptodate.
513 ret = ext4_read_inline_page(inode, page);
514 else if (!PageUptodate(page)) {
515 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
516 SetPageUptodate(page);
519 up_read(&EXT4_I(inode)->xattr_sem);
522 return ret >= 0 ? 0 : ret;
525 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
529 int ret, needed_blocks;
530 handle_t *handle = NULL;
531 int retries = 0, sem_held = 0;
532 struct page *page = NULL;
534 struct ext4_iloc iloc;
536 if (!ext4_has_inline_data(inode)) {
538 * clear the flag so that no new write
539 * will trap here again.
541 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
545 needed_blocks = ext4_writepage_trans_blocks(inode);
547 ret = ext4_get_inode_loc(inode, &iloc);
552 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
553 if (IS_ERR(handle)) {
554 ret = PTR_ERR(handle);
559 /* We cannot recurse into the filesystem as the transaction is already
561 flags |= AOP_FLAG_NOFS;
563 page = grab_cache_page_write_begin(mapping, 0, flags);
569 down_write(&EXT4_I(inode)->xattr_sem);
571 /* If some one has already done this for us, just exit. */
572 if (!ext4_has_inline_data(inode)) {
578 to = ext4_get_inline_size(inode);
579 if (!PageUptodate(page)) {
580 ret = ext4_read_inline_page(inode, page);
585 ret = ext4_destroy_inline_data_nolock(handle, inode);
589 if (ext4_should_dioread_nolock(inode))
590 ret = __block_write_begin(page, from, to, ext4_get_block_write);
592 ret = __block_write_begin(page, from, to, ext4_get_block);
594 if (!ret && ext4_should_journal_data(inode)) {
595 ret = ext4_walk_page_buffers(handle, page_buffers(page),
597 do_journal_get_write_access);
602 page_cache_release(page);
603 ext4_orphan_add(handle, inode);
604 up_write(&EXT4_I(inode)->xattr_sem);
606 ext4_journal_stop(handle);
608 ext4_truncate_failed_write(inode);
610 * If truncate failed early the inode might
611 * still be on the orphan list; we need to
612 * make sure the inode is removed from the
613 * orphan list in that case.
616 ext4_orphan_del(NULL, inode);
619 if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
622 block_commit_write(page, from, to);
626 page_cache_release(page);
629 up_write(&EXT4_I(inode)->xattr_sem);
631 ext4_journal_stop(handle);
637 * Try to write data in the inode.
638 * If the inode has inline data, check whether the new write can be
639 * in the inode also. If not, create the page the handle, move the data
640 * to the page make it update and let the later codes create extent for it.
642 int ext4_try_to_write_inline_data(struct address_space *mapping,
644 loff_t pos, unsigned len,
651 struct ext4_iloc iloc;
653 if (pos + len > ext4_get_max_inline_size(inode))
656 ret = ext4_get_inode_loc(inode, &iloc);
661 * The possible write could happen in the inode,
662 * so try to reserve the space in inode first.
664 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
665 if (IS_ERR(handle)) {
666 ret = PTR_ERR(handle);
671 ret = ext4_prepare_inline_data(handle, inode, pos + len);
672 if (ret && ret != -ENOSPC)
675 /* We don't have space in inline inode, so convert it to extent. */
676 if (ret == -ENOSPC) {
677 ext4_journal_stop(handle);
682 flags |= AOP_FLAG_NOFS;
684 page = grab_cache_page_write_begin(mapping, 0, flags);
691 down_read(&EXT4_I(inode)->xattr_sem);
692 if (!ext4_has_inline_data(inode)) {
695 page_cache_release(page);
699 if (!PageUptodate(page)) {
700 ret = ext4_read_inline_page(inode, page);
708 up_read(&EXT4_I(inode)->xattr_sem);
711 ext4_journal_stop(handle);
715 return ext4_convert_inline_data_to_extent(mapping,
719 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
720 unsigned copied, struct page *page)
724 struct ext4_iloc iloc;
726 if (unlikely(copied < len)) {
727 if (!PageUptodate(page)) {
733 ret = ext4_get_inode_loc(inode, &iloc);
735 ext4_std_error(inode->i_sb, ret);
740 down_write(&EXT4_I(inode)->xattr_sem);
741 BUG_ON(!ext4_has_inline_data(inode));
743 kaddr = kmap_atomic(page);
744 ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
745 kunmap_atomic(kaddr);
746 SetPageUptodate(page);
747 /* clear page dirty so that writepages wouldn't work for us. */
748 ClearPageDirty(page);
750 up_write(&EXT4_I(inode)->xattr_sem);
757 ext4_journalled_write_inline_data(struct inode *inode,
763 struct ext4_iloc iloc;
765 ret = ext4_get_inode_loc(inode, &iloc);
767 ext4_std_error(inode->i_sb, ret);
771 down_write(&EXT4_I(inode)->xattr_sem);
772 kaddr = kmap_atomic(page);
773 ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
774 kunmap_atomic(kaddr);
775 up_write(&EXT4_I(inode)->xattr_sem);
781 * Try to make the page cache and handle ready for the inline data case.
782 * We can call this function in 2 cases:
783 * 1. The inode is created and the first write exceeds inline size. We can
784 * clear the inode state safely.
785 * 2. The inode has inline data, then we need to read the data, make it
786 * update and dirty so that ext4_da_writepages can handle it. We don't
787 * need to start the journal since the file's metatdata isn't changed now.
789 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
794 int ret = 0, inline_size;
797 page = grab_cache_page_write_begin(mapping, 0, flags);
801 down_read(&EXT4_I(inode)->xattr_sem);
802 if (!ext4_has_inline_data(inode)) {
803 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
807 inline_size = ext4_get_inline_size(inode);
809 if (!PageUptodate(page)) {
810 ret = ext4_read_inline_page(inode, page);
815 ret = __block_write_begin(page, 0, inline_size,
816 ext4_da_get_block_prep);
818 ext4_truncate_failed_write(inode);
823 SetPageUptodate(page);
824 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
825 *fsdata = (void *)CONVERT_INLINE_DATA;
828 up_read(&EXT4_I(inode)->xattr_sem);
831 page_cache_release(page);
837 * Prepare the write for the inline data.
838 * If the the data can be written into the inode, we just read
839 * the page and make it uptodate, and start the journal.
840 * Otherwise read the page, makes it dirty so that it can be
841 * handle in writepages(the i_disksize update is left to the
842 * normal ext4_da_write_end).
844 int ext4_da_write_inline_data_begin(struct address_space *mapping,
846 loff_t pos, unsigned len,
851 int ret, inline_size;
854 struct ext4_iloc iloc;
857 ret = ext4_get_inode_loc(inode, &iloc);
862 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
863 if (IS_ERR(handle)) {
864 ret = PTR_ERR(handle);
868 inline_size = ext4_get_max_inline_size(inode);
871 if (inline_size >= pos + len) {
872 ret = ext4_prepare_inline_data(handle, inode, pos + len);
873 if (ret && ret != -ENOSPC)
877 if (ret == -ENOSPC) {
878 ret = ext4_da_convert_inline_data_to_extent(mapping,
882 ext4_journal_stop(handle);
883 if (ret == -ENOSPC &&
884 ext4_should_retry_alloc(inode->i_sb, &retries))
890 * We cannot recurse into the filesystem as the transaction
891 * is already started.
893 flags |= AOP_FLAG_NOFS;
895 page = grab_cache_page_write_begin(mapping, 0, flags);
901 down_read(&EXT4_I(inode)->xattr_sem);
902 if (!ext4_has_inline_data(inode)) {
904 goto out_release_page;
907 if (!PageUptodate(page)) {
908 ret = ext4_read_inline_page(inode, page);
910 goto out_release_page;
913 up_read(&EXT4_I(inode)->xattr_sem);
918 up_read(&EXT4_I(inode)->xattr_sem);
920 page_cache_release(page);
922 ext4_journal_stop(handle);
928 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
929 unsigned len, unsigned copied,
932 int i_size_changed = 0;
934 copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
937 * No need to use i_size_read() here, the i_size
938 * cannot change under us because we hold i_mutex.
940 * But it's important to update i_size while still holding page lock:
941 * page writeout could otherwise come in and zero beyond i_size.
943 if (pos+copied > inode->i_size) {
944 i_size_write(inode, pos+copied);
948 page_cache_release(page);
951 * Don't mark the inode dirty under page lock. First, it unnecessarily
952 * makes the holding time of page lock longer. Second, it forces lock
953 * ordering of page lock and transaction start for journaling
957 mark_inode_dirty(inode);
962 #ifdef INLINE_DIR_DEBUG
963 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
964 void *inline_start, int inline_size)
967 unsigned short de_len;
968 struct ext4_dir_entry_2 *de = inline_start;
969 void *dlimit = inline_start + inline_size;
971 trace_printk("inode %lu\n", dir->i_ino);
973 while ((void *)de < dlimit) {
974 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
975 trace_printk("de: off %u rlen %u name %*.s nlen %u ino %u\n",
976 offset, de_len, de->name_len, de->name,
977 de->name_len, le32_to_cpu(de->inode));
978 if (ext4_check_dir_entry(dir, NULL, de, bh,
979 inline_start, inline_size, offset))
983 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
987 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
991 * Add a new entry into a inline dir.
992 * It will return -ENOSPC if no space is available, and -EIO
993 * and -EEXIST if directory entry already exists.
995 static int ext4_add_dirent_to_inline(handle_t *handle,
996 struct dentry *dentry,
998 struct ext4_iloc *iloc,
999 void *inline_start, int inline_size)
1001 struct inode *dir = dentry->d_parent->d_inode;
1002 const char *name = dentry->d_name.name;
1003 int namelen = dentry->d_name.len;
1005 struct ext4_dir_entry_2 *de;
1007 err = ext4_find_dest_de(dir, inode, iloc->bh,
1008 inline_start, inline_size,
1009 name, namelen, &de);
1013 BUFFER_TRACE(iloc->bh, "get_write_access");
1014 err = ext4_journal_get_write_access(handle, iloc->bh);
1017 ext4_insert_dentry(inode, de, inline_size, name, namelen);
1019 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1022 * XXX shouldn't update any times until successful
1023 * completion of syscall, but too many callers depend
1026 * XXX similarly, too many callers depend on
1027 * ext4_new_inode() setting the times, but error
1028 * recovery deletes the inode, so the worst that can
1029 * happen is that the times are slightly out of date
1030 * and/or different from the directory change time.
1032 dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1033 ext4_update_dx_flag(dir);
1035 ext4_mark_inode_dirty(handle, dir);
1039 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1040 struct ext4_iloc *iloc)
1042 struct ext4_xattr_entry *entry;
1043 struct ext4_xattr_ibody_header *header;
1045 BUG_ON(!EXT4_I(inode)->i_inline_off);
1047 header = IHDR(inode, ext4_raw_inode(iloc));
1048 entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1049 EXT4_I(inode)->i_inline_off);
1051 return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1054 /* Set the final de to cover the whole block. */
1055 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1057 struct ext4_dir_entry_2 *de, *prev_de;
1061 de = (struct ext4_dir_entry_2 *)de_buf;
1063 limit = de_buf + old_size;
1066 de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1068 de = (struct ext4_dir_entry_2 *)de_buf;
1069 } while (de_buf < limit);
1071 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1072 old_size, new_size);
1074 /* this is just created, so create an empty entry. */
1076 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1080 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1081 struct ext4_iloc *iloc)
1084 int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1085 int new_size = get_max_inline_xattr_value_size(dir, iloc);
1087 if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1090 ret = ext4_update_inline_data(handle, dir,
1091 new_size + EXT4_MIN_INLINE_DATA_SIZE);
1095 ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1096 EXT4_I(dir)->i_inline_size -
1097 EXT4_MIN_INLINE_DATA_SIZE);
1098 dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1102 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1103 struct ext4_iloc *iloc,
1104 void *buf, int inline_size)
1106 ext4_create_inline_data(handle, inode, inline_size);
1107 ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1108 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1111 static int ext4_finish_convert_inline_dir(handle_t *handle,
1112 struct inode *inode,
1113 struct buffer_head *dir_block,
1117 int err, csum_size = 0, header_size = 0;
1118 struct ext4_dir_entry_2 *de;
1119 struct ext4_dir_entry_tail *t;
1120 void *target = dir_block->b_data;
1123 * First create "." and ".." and then copy the dir information
1124 * back to the block.
1126 de = (struct ext4_dir_entry_2 *)target;
1127 de = ext4_init_dot_dotdot(inode, de,
1128 inode->i_sb->s_blocksize, csum_size,
1129 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1130 header_size = (void *)de - target;
1132 memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1133 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1135 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
1136 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
1137 csum_size = sizeof(struct ext4_dir_entry_tail);
1139 inode->i_size = inode->i_sb->s_blocksize;
1140 i_size_write(inode, inode->i_sb->s_blocksize);
1141 EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1142 ext4_update_final_de(dir_block->b_data,
1143 inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1144 inode->i_sb->s_blocksize - csum_size);
1147 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1148 inode->i_sb->s_blocksize);
1149 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1151 set_buffer_uptodate(dir_block);
1152 err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1155 set_buffer_verified(dir_block);
1160 static int ext4_convert_inline_data_nolock(handle_t *handle,
1161 struct inode *inode,
1162 struct ext4_iloc *iloc)
1166 struct buffer_head *data_bh = NULL;
1167 struct ext4_map_blocks map;
1170 inline_size = ext4_get_inline_size(inode);
1171 buf = kmalloc(inline_size, GFP_NOFS);
1177 error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1181 error = ext4_destroy_inline_data_nolock(handle, inode);
1188 error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1191 if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1196 data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1202 lock_buffer(data_bh);
1203 error = ext4_journal_get_create_access(handle, data_bh);
1205 unlock_buffer(data_bh);
1209 memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1211 if (!S_ISDIR(inode->i_mode)) {
1212 memcpy(data_bh->b_data, buf, inline_size);
1213 set_buffer_uptodate(data_bh);
1214 error = ext4_handle_dirty_metadata(handle,
1217 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1221 unlock_buffer(data_bh);
1224 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1233 * Try to add the new entry to the inline data.
1234 * If succeeds, return 0. If not, extended the inline dir and copied data to
1235 * the new created block.
1237 int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
1238 struct inode *inode)
1240 int ret, inline_size;
1242 struct ext4_iloc iloc;
1243 struct inode *dir = dentry->d_parent->d_inode;
1245 ret = ext4_get_inode_loc(dir, &iloc);
1249 down_write(&EXT4_I(dir)->xattr_sem);
1250 if (!ext4_has_inline_data(dir))
1253 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1254 EXT4_INLINE_DOTDOT_SIZE;
1255 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1257 ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1258 inline_start, inline_size);
1262 /* check whether it can be inserted to inline xattr space. */
1263 inline_size = EXT4_I(dir)->i_inline_size -
1264 EXT4_MIN_INLINE_DATA_SIZE;
1266 /* Try to use the xattr space.*/
1267 ret = ext4_update_inline_dir(handle, dir, &iloc);
1268 if (ret && ret != -ENOSPC)
1271 inline_size = EXT4_I(dir)->i_inline_size -
1272 EXT4_MIN_INLINE_DATA_SIZE;
1276 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1278 ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1279 inline_start, inline_size);
1286 * The inline space is filled up, so create a new block for it.
1287 * As the extent tree will be created, we have to save the inline
1290 ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1293 ext4_mark_inode_dirty(handle, dir);
1294 up_write(&EXT4_I(dir)->xattr_sem);
1300 * This function fills a red-black tree with information from an
1301 * inlined dir. It returns the number directory entries loaded
1302 * into the tree. If there is an error it is returned in err.
1304 int htree_inlinedir_to_tree(struct file *dir_file,
1305 struct inode *dir, ext4_lblk_t block,
1306 struct dx_hash_info *hinfo,
1307 __u32 start_hash, __u32 start_minor_hash,
1308 int *has_inline_data)
1310 int err = 0, count = 0;
1311 unsigned int parent_ino;
1313 struct ext4_dir_entry_2 *de;
1314 struct inode *inode = file_inode(dir_file);
1315 int ret, inline_size = 0;
1316 struct ext4_iloc iloc;
1317 void *dir_buf = NULL;
1318 struct ext4_dir_entry_2 fake;
1320 ret = ext4_get_inode_loc(inode, &iloc);
1324 down_read(&EXT4_I(inode)->xattr_sem);
1325 if (!ext4_has_inline_data(inode)) {
1326 up_read(&EXT4_I(inode)->xattr_sem);
1327 *has_inline_data = 0;
1331 inline_size = ext4_get_inline_size(inode);
1332 dir_buf = kmalloc(inline_size, GFP_NOFS);
1335 up_read(&EXT4_I(inode)->xattr_sem);
1339 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1340 up_read(&EXT4_I(inode)->xattr_sem);
1345 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1346 while (pos < inline_size) {
1348 * As inlined dir doesn't store any information about '.' and
1349 * only the inode number of '..' is stored, we have to handle
1353 fake.inode = cpu_to_le32(inode->i_ino);
1355 strcpy(fake.name, ".");
1356 fake.rec_len = ext4_rec_len_to_disk(
1357 EXT4_DIR_REC_LEN(fake.name_len),
1359 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1361 pos = EXT4_INLINE_DOTDOT_OFFSET;
1362 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1363 fake.inode = cpu_to_le32(parent_ino);
1365 strcpy(fake.name, "..");
1366 fake.rec_len = ext4_rec_len_to_disk(
1367 EXT4_DIR_REC_LEN(fake.name_len),
1369 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1371 pos = EXT4_INLINE_DOTDOT_SIZE;
1373 de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1374 pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1375 if (ext4_check_dir_entry(inode, dir_file, de,
1377 inline_size, pos)) {
1383 ext4fs_dirhash(de->name, de->name_len, hinfo);
1384 if ((hinfo->hash < start_hash) ||
1385 ((hinfo->hash == start_hash) &&
1386 (hinfo->minor_hash < start_minor_hash)))
1390 err = ext4_htree_store_dirent(dir_file,
1391 hinfo->hash, hinfo->minor_hash, de);
1406 * So this function is called when the volume is mkfsed with
1407 * dir_index disabled. In order to keep f_pos persistent
1408 * after we convert from an inlined dir to a blocked based,
1409 * we just pretend that we are a normal dir and return the
1410 * offset as if '.' and '..' really take place.
1413 int ext4_read_inline_dir(struct file *file,
1414 struct dir_context *ctx,
1415 int *has_inline_data)
1417 unsigned int offset, parent_ino;
1419 struct ext4_dir_entry_2 *de;
1420 struct super_block *sb;
1421 struct inode *inode = file_inode(file);
1422 int ret, inline_size = 0;
1423 struct ext4_iloc iloc;
1424 void *dir_buf = NULL;
1425 int dotdot_offset, dotdot_size, extra_offset, extra_size;
1427 ret = ext4_get_inode_loc(inode, &iloc);
1431 down_read(&EXT4_I(inode)->xattr_sem);
1432 if (!ext4_has_inline_data(inode)) {
1433 up_read(&EXT4_I(inode)->xattr_sem);
1434 *has_inline_data = 0;
1438 inline_size = ext4_get_inline_size(inode);
1439 dir_buf = kmalloc(inline_size, GFP_NOFS);
1442 up_read(&EXT4_I(inode)->xattr_sem);
1446 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1447 up_read(&EXT4_I(inode)->xattr_sem);
1453 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1457 * dotdot_offset and dotdot_size is the real offset and
1458 * size for ".." and "." if the dir is block based while
1459 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1460 * So we will use extra_offset and extra_size to indicate them
1461 * during the inline dir iteration.
1463 dotdot_offset = EXT4_DIR_REC_LEN(1);
1464 dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1465 extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1466 extra_size = extra_offset + inline_size;
1469 * If the version has changed since the last call to
1470 * readdir(2), then we might be pointing to an invalid
1471 * dirent right now. Scan from the start of the inline
1474 if (file->f_version != inode->i_version) {
1475 for (i = 0; i < extra_size && i < offset;) {
1477 * "." is with offset 0 and
1478 * ".." is dotdot_offset.
1483 } else if (i == dotdot_offset) {
1487 /* for other entry, the real offset in
1488 * the buf has to be tuned accordingly.
1490 de = (struct ext4_dir_entry_2 *)
1491 (dir_buf + i - extra_offset);
1492 /* It's too expensive to do a full
1493 * dirent test each time round this
1494 * loop, but we do have to test at
1495 * least that it is non-zero. A
1496 * failure will be detected in the
1497 * dirent test below. */
1498 if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1499 < EXT4_DIR_REC_LEN(1))
1501 i += ext4_rec_len_from_disk(de->rec_len,
1506 file->f_version = inode->i_version;
1509 while (ctx->pos < extra_size) {
1510 if (ctx->pos == 0) {
1511 if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1513 ctx->pos = dotdot_offset;
1517 if (ctx->pos == dotdot_offset) {
1518 if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1520 ctx->pos = dotdot_size;
1524 de = (struct ext4_dir_entry_2 *)
1525 (dir_buf + ctx->pos - extra_offset);
1526 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1527 extra_size, ctx->pos))
1529 if (le32_to_cpu(de->inode)) {
1530 if (!dir_emit(ctx, de->name, de->name_len,
1531 le32_to_cpu(de->inode),
1532 get_dtype(sb, de->file_type)))
1535 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1543 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1544 struct ext4_dir_entry_2 **parent_de,
1547 struct ext4_iloc iloc;
1549 *retval = ext4_get_inode_loc(inode, &iloc);
1553 *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1559 * Try to create the inline data for the new dir.
1560 * If it succeeds, return 0, otherwise return the error.
1561 * In case of ENOSPC, the caller should create the normal disk layout dir.
1563 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1564 struct inode *inode)
1566 int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1567 struct ext4_iloc iloc;
1568 struct ext4_dir_entry_2 *de;
1570 ret = ext4_get_inode_loc(inode, &iloc);
1574 ret = ext4_prepare_inline_data(handle, inode, inline_size);
1579 * For inline dir, we only save the inode information for the ".."
1580 * and create a fake dentry to cover the left space.
1582 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1583 de->inode = cpu_to_le32(parent->i_ino);
1584 de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1586 de->rec_len = ext4_rec_len_to_disk(
1587 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1589 set_nlink(inode, 2);
1590 inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1596 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1597 const struct qstr *d_name,
1598 struct ext4_dir_entry_2 **res_dir,
1599 int *has_inline_data)
1602 struct ext4_iloc iloc;
1606 if (ext4_get_inode_loc(dir, &iloc))
1609 down_read(&EXT4_I(dir)->xattr_sem);
1610 if (!ext4_has_inline_data(dir)) {
1611 *has_inline_data = 0;
1615 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1616 EXT4_INLINE_DOTDOT_SIZE;
1617 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1618 ret = search_dir(iloc.bh, inline_start, inline_size,
1619 dir, d_name, 0, res_dir);
1625 if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1628 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1629 inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1631 ret = search_dir(iloc.bh, inline_start, inline_size,
1632 dir, d_name, 0, res_dir);
1640 up_read(&EXT4_I(dir)->xattr_sem);
1644 int ext4_delete_inline_entry(handle_t *handle,
1646 struct ext4_dir_entry_2 *de_del,
1647 struct buffer_head *bh,
1648 int *has_inline_data)
1650 int err, inline_size;
1651 struct ext4_iloc iloc;
1654 err = ext4_get_inode_loc(dir, &iloc);
1658 down_write(&EXT4_I(dir)->xattr_sem);
1659 if (!ext4_has_inline_data(dir)) {
1660 *has_inline_data = 0;
1664 if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1665 EXT4_MIN_INLINE_DATA_SIZE) {
1666 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1667 EXT4_INLINE_DOTDOT_SIZE;
1668 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1669 EXT4_INLINE_DOTDOT_SIZE;
1671 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1672 inline_size = ext4_get_inline_size(dir) -
1673 EXT4_MIN_INLINE_DATA_SIZE;
1676 BUFFER_TRACE(bh, "get_write_access");
1677 err = ext4_journal_get_write_access(handle, bh);
1681 err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1682 inline_start, inline_size, 0);
1686 BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1687 err = ext4_mark_inode_dirty(handle, dir);
1691 ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1693 up_write(&EXT4_I(dir)->xattr_sem);
1696 ext4_std_error(dir->i_sb, err);
1701 * Get the inline dentry at offset.
1703 static inline struct ext4_dir_entry_2 *
1704 ext4_get_inline_entry(struct inode *inode,
1705 struct ext4_iloc *iloc,
1706 unsigned int offset,
1707 void **inline_start,
1712 BUG_ON(offset > ext4_get_inline_size(inode));
1714 if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1715 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1716 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1718 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1719 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1720 *inline_size = ext4_get_inline_size(inode) -
1721 EXT4_MIN_INLINE_DATA_SIZE;
1725 *inline_start = inline_pos;
1726 return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1729 int empty_inline_dir(struct inode *dir, int *has_inline_data)
1731 int err, inline_size;
1732 struct ext4_iloc iloc;
1734 unsigned int offset;
1735 struct ext4_dir_entry_2 *de;
1738 err = ext4_get_inode_loc(dir, &iloc);
1740 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1745 down_read(&EXT4_I(dir)->xattr_sem);
1746 if (!ext4_has_inline_data(dir)) {
1747 *has_inline_data = 0;
1751 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1752 if (!le32_to_cpu(de->inode)) {
1753 ext4_warning(dir->i_sb,
1754 "bad inline directory (dir #%lu) - no `..'",
1760 offset = EXT4_INLINE_DOTDOT_SIZE;
1761 while (offset < dir->i_size) {
1762 de = ext4_get_inline_entry(dir, &iloc, offset,
1763 &inline_pos, &inline_size);
1764 if (ext4_check_dir_entry(dir, NULL, de,
1765 iloc.bh, inline_pos,
1766 inline_size, offset)) {
1767 ext4_warning(dir->i_sb,
1768 "bad inline directory (dir #%lu) - "
1769 "inode %u, rec_len %u, name_len %d"
1771 dir->i_ino, le32_to_cpu(de->inode),
1772 le16_to_cpu(de->rec_len), de->name_len,
1777 if (le32_to_cpu(de->inode)) {
1781 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1785 up_read(&EXT4_I(dir)->xattr_sem);
1790 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1794 down_write(&EXT4_I(inode)->xattr_sem);
1795 ret = ext4_destroy_inline_data_nolock(handle, inode);
1796 up_write(&EXT4_I(inode)->xattr_sem);
1801 int ext4_inline_data_fiemap(struct inode *inode,
1802 struct fiemap_extent_info *fieinfo,
1807 __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_LAST;
1809 struct ext4_iloc iloc;
1811 down_read(&EXT4_I(inode)->xattr_sem);
1812 if (!ext4_has_inline_data(inode)) {
1817 error = ext4_get_inode_loc(inode, &iloc);
1821 physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1822 physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1823 physical += offsetof(struct ext4_inode, i_block);
1824 length = i_size_read(inode);
1827 error = fiemap_fill_next_extent(fieinfo, 0, physical,
1831 up_read(&EXT4_I(inode)->xattr_sem);
1832 return (error < 0 ? error : 0);
1836 * Called during xattr set, and if we can sparse space 'needed',
1837 * just create the extent tree evict the data to the outer block.
1839 * We use jbd2 instead of page cache to move data to the 1st block
1840 * so that the whole transaction can be committed as a whole and
1841 * the data isn't lost because of the delayed page cache write.
1843 int ext4_try_to_evict_inline_data(handle_t *handle,
1844 struct inode *inode,
1848 struct ext4_xattr_entry *entry;
1849 struct ext4_inode *raw_inode;
1850 struct ext4_iloc iloc;
1852 error = ext4_get_inode_loc(inode, &iloc);
1856 raw_inode = ext4_raw_inode(&iloc);
1857 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1858 EXT4_I(inode)->i_inline_off);
1859 if (EXT4_XATTR_LEN(entry->e_name_len) +
1860 EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1865 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1871 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1874 int inline_size, value_len, needed_blocks;
1877 struct ext4_xattr_ibody_find is = {
1878 .s = { .not_found = -ENODATA, },
1880 struct ext4_xattr_info i = {
1881 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1882 .name = EXT4_XATTR_SYSTEM_DATA,
1886 needed_blocks = ext4_writepage_trans_blocks(inode);
1887 handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1891 down_write(&EXT4_I(inode)->xattr_sem);
1892 if (!ext4_has_inline_data(inode)) {
1894 ext4_journal_stop(handle);
1898 if (ext4_orphan_add(handle, inode))
1901 if (ext4_get_inode_loc(inode, &is.iloc))
1904 down_write(&EXT4_I(inode)->i_data_sem);
1905 i_size = inode->i_size;
1906 inline_size = ext4_get_inline_size(inode);
1907 EXT4_I(inode)->i_disksize = i_size;
1909 if (i_size < inline_size) {
1910 /* Clear the content in the xattr space. */
1911 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1912 if (ext4_xattr_ibody_find(inode, &i, &is))
1915 BUG_ON(is.s.not_found);
1917 value_len = le32_to_cpu(is.s.here->e_value_size);
1918 value = kmalloc(value_len, GFP_NOFS);
1922 if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1927 i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1928 i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1929 if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1933 /* Clear the content within i_blocks. */
1934 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1935 void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1936 memset(p + i_size, 0,
1937 EXT4_MIN_INLINE_DATA_SIZE - i_size);
1940 EXT4_I(inode)->i_inline_size = i_size <
1941 EXT4_MIN_INLINE_DATA_SIZE ?
1942 EXT4_MIN_INLINE_DATA_SIZE : i_size;
1946 up_write(&EXT4_I(inode)->i_data_sem);
1949 up_write(&EXT4_I(inode)->xattr_sem);
1952 ext4_orphan_del(handle, inode);
1954 inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1955 ext4_mark_inode_dirty(handle, inode);
1957 ext4_handle_sync(handle);
1959 ext4_journal_stop(handle);
1963 int ext4_convert_inline_data(struct inode *inode)
1965 int error, needed_blocks;
1967 struct ext4_iloc iloc;
1969 if (!ext4_has_inline_data(inode)) {
1970 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1974 needed_blocks = ext4_writepage_trans_blocks(inode);
1977 error = ext4_get_inode_loc(inode, &iloc);
1981 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
1982 if (IS_ERR(handle)) {
1983 error = PTR_ERR(handle);
1987 down_write(&EXT4_I(inode)->xattr_sem);
1988 if (!ext4_has_inline_data(inode)) {
1989 up_write(&EXT4_I(inode)->xattr_sem);
1993 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1994 up_write(&EXT4_I(inode)->xattr_sem);
1996 ext4_journal_stop(handle);