2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/bio.h>
20 #include <linux/slab.h>
21 #include <linux/pagemap.h>
22 #include <linux/highmem.h>
25 #include "transaction.h"
26 #include "print-tree.h"
28 #define __MAX_CSUM_ITEMS(r, size) ((unsigned long)(((BTRFS_LEAF_DATA_SIZE(r) - \
29 sizeof(struct btrfs_item) * 2) / \
32 #define MAX_CSUM_ITEMS(r, size) (min_t(u32, __MAX_CSUM_ITEMS(r, size), \
35 #define MAX_ORDERED_SUM_BYTES(r) ((PAGE_SIZE - \
36 sizeof(struct btrfs_ordered_sum)) / \
37 sizeof(struct btrfs_sector_sum) * \
38 (r)->sectorsize - (r)->sectorsize)
40 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
41 struct btrfs_root *root,
42 u64 objectid, u64 pos,
43 u64 disk_offset, u64 disk_num_bytes,
44 u64 num_bytes, u64 offset, u64 ram_bytes,
45 u8 compression, u8 encryption, u16 other_encoding)
48 struct btrfs_file_extent_item *item;
49 struct btrfs_key file_key;
50 struct btrfs_path *path;
51 struct extent_buffer *leaf;
53 path = btrfs_alloc_path();
56 file_key.objectid = objectid;
57 file_key.offset = pos;
58 btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
60 path->leave_spinning = 1;
61 ret = btrfs_insert_empty_item(trans, root, path, &file_key,
65 BUG_ON(ret); /* Can't happen */
66 leaf = path->nodes[0];
67 item = btrfs_item_ptr(leaf, path->slots[0],
68 struct btrfs_file_extent_item);
69 btrfs_set_file_extent_disk_bytenr(leaf, item, disk_offset);
70 btrfs_set_file_extent_disk_num_bytes(leaf, item, disk_num_bytes);
71 btrfs_set_file_extent_offset(leaf, item, offset);
72 btrfs_set_file_extent_num_bytes(leaf, item, num_bytes);
73 btrfs_set_file_extent_ram_bytes(leaf, item, ram_bytes);
74 btrfs_set_file_extent_generation(leaf, item, trans->transid);
75 btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG);
76 btrfs_set_file_extent_compression(leaf, item, compression);
77 btrfs_set_file_extent_encryption(leaf, item, encryption);
78 btrfs_set_file_extent_other_encoding(leaf, item, other_encoding);
80 btrfs_mark_buffer_dirty(leaf);
82 btrfs_free_path(path);
86 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
87 struct btrfs_root *root,
88 struct btrfs_path *path,
92 struct btrfs_key file_key;
93 struct btrfs_key found_key;
94 struct btrfs_csum_item *item;
95 struct extent_buffer *leaf;
97 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
100 file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
101 file_key.offset = bytenr;
102 btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
103 ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow);
106 leaf = path->nodes[0];
109 if (path->slots[0] == 0)
112 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
113 if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY)
116 csum_offset = (bytenr - found_key.offset) >>
117 root->fs_info->sb->s_blocksize_bits;
118 csums_in_item = btrfs_item_size_nr(leaf, path->slots[0]);
119 csums_in_item /= csum_size;
121 if (csum_offset == csums_in_item) {
124 } else if (csum_offset > csums_in_item) {
128 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
129 item = (struct btrfs_csum_item *)((unsigned char *)item +
130 csum_offset * csum_size);
138 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
139 struct btrfs_root *root,
140 struct btrfs_path *path, u64 objectid,
144 struct btrfs_key file_key;
145 int ins_len = mod < 0 ? -1 : 0;
148 file_key.objectid = objectid;
149 file_key.offset = offset;
150 btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
151 ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow);
155 u64 btrfs_file_extent_length(struct btrfs_path *path)
158 struct btrfs_file_extent_item *fi;
161 fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
162 struct btrfs_file_extent_item);
163 extent_type = btrfs_file_extent_type(path->nodes[0], fi);
165 if (extent_type == BTRFS_FILE_EXTENT_REG ||
166 extent_type == BTRFS_FILE_EXTENT_PREALLOC)
167 len = btrfs_file_extent_num_bytes(path->nodes[0], fi);
168 else if (extent_type == BTRFS_FILE_EXTENT_INLINE)
169 len = btrfs_file_extent_inline_len(path->nodes[0], fi);
176 static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
177 struct inode *inode, struct bio *bio,
178 u64 logical_offset, u32 *dst, int dio)
182 struct bio_vec *bvec = bio->bi_io_vec;
185 u64 item_start_offset = 0;
186 u64 item_last_offset = 0;
189 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
191 struct btrfs_path *path;
192 struct btrfs_csum_item *item = NULL;
193 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
195 path = btrfs_alloc_path();
198 if (bio->bi_size > PAGE_CACHE_SIZE * 8)
201 WARN_ON(bio->bi_vcnt <= 0);
204 * the free space stuff is only read when it hasn't been
205 * updated in the current transaction. So, we can safely
206 * read from the commit root and sidestep a nasty deadlock
207 * between reading the free space cache and updating the csum tree.
209 if (btrfs_is_free_space_inode(inode)) {
210 path->search_commit_root = 1;
211 path->skip_locking = 1;
214 disk_bytenr = (u64)bio->bi_sector << 9;
216 offset = logical_offset;
217 while (bio_index < bio->bi_vcnt) {
218 len = min_t(int, ARRAY_SIZE(sum), bio->bi_vcnt - bio_index);
220 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
221 count = btrfs_find_ordered_sum(inode, offset, disk_bytenr, sum,
226 if (!item || disk_bytenr < item_start_offset ||
227 disk_bytenr >= item_last_offset) {
228 struct btrfs_key found_key;
232 btrfs_release_path(path);
233 item = btrfs_lookup_csum(NULL, root->fs_info->csum_root,
234 path, disk_bytenr, 0);
238 if (BTRFS_I(inode)->root->root_key.objectid ==
239 BTRFS_DATA_RELOC_TREE_OBJECTID) {
240 set_extent_bits(io_tree, offset,
241 offset + bvec->bv_len - 1,
242 EXTENT_NODATASUM, GFP_NOFS);
244 printk(KERN_INFO "btrfs no csum found "
245 "for inode %llu start %llu\n",
248 (unsigned long long)offset);
251 btrfs_release_path(path);
254 btrfs_item_key_to_cpu(path->nodes[0], &found_key,
257 item_start_offset = found_key.offset;
258 item_size = btrfs_item_size_nr(path->nodes[0],
260 item_last_offset = item_start_offset +
261 (item_size / csum_size) *
263 item = btrfs_item_ptr(path->nodes[0], path->slots[0],
264 struct btrfs_csum_item);
267 * this byte range must be able to fit inside
268 * a single leaf so it will also fit inside a u32
270 diff = disk_bytenr - item_start_offset;
271 diff = diff / root->sectorsize;
272 diff = diff * csum_size;
273 count = min_t(int, len, (item_last_offset - disk_bytenr) >>
274 inode->i_sb->s_blocksize_bits);
275 read_extent_buffer(path->nodes[0], sum,
276 ((unsigned long)item) + diff,
280 memcpy(dst, sum, count * csum_size);
284 extent_cache_csums_dio(io_tree, offset, sum,
287 extent_cache_csums(io_tree, bio, bio_index, sum,
291 disk_bytenr += bvec->bv_len;
292 offset += bvec->bv_len;
297 btrfs_free_path(path);
301 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
302 struct bio *bio, u32 *dst)
304 return __btrfs_lookup_bio_sums(root, inode, bio, 0, dst, 0);
307 int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
308 struct bio *bio, u64 offset)
310 return __btrfs_lookup_bio_sums(root, inode, bio, offset, NULL, 1);
313 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
314 struct list_head *list, int search_commit)
316 struct btrfs_key key;
317 struct btrfs_path *path;
318 struct extent_buffer *leaf;
319 struct btrfs_ordered_sum *sums;
320 struct btrfs_sector_sum *sector_sum;
321 struct btrfs_csum_item *item;
323 unsigned long offset;
327 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
329 path = btrfs_alloc_path();
334 path->skip_locking = 1;
336 path->search_commit_root = 1;
339 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
341 key.type = BTRFS_EXTENT_CSUM_KEY;
343 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
346 if (ret > 0 && path->slots[0] > 0) {
347 leaf = path->nodes[0];
348 btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1);
349 if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID &&
350 key.type == BTRFS_EXTENT_CSUM_KEY) {
351 offset = (start - key.offset) >>
352 root->fs_info->sb->s_blocksize_bits;
353 if (offset * csum_size <
354 btrfs_item_size_nr(leaf, path->slots[0] - 1))
359 while (start <= end) {
360 leaf = path->nodes[0];
361 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
362 ret = btrfs_next_leaf(root, path);
367 leaf = path->nodes[0];
370 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
371 if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
372 key.type != BTRFS_EXTENT_CSUM_KEY ||
376 if (key.offset > start)
379 size = btrfs_item_size_nr(leaf, path->slots[0]);
380 csum_end = key.offset + (size / csum_size) * root->sectorsize;
381 if (csum_end <= start) {
386 csum_end = min(csum_end, end + 1);
387 item = btrfs_item_ptr(path->nodes[0], path->slots[0],
388 struct btrfs_csum_item);
389 while (start < csum_end) {
390 size = min_t(size_t, csum_end - start,
391 MAX_ORDERED_SUM_BYTES(root));
392 sums = kzalloc(btrfs_ordered_sum_size(root, size),
399 sector_sum = sums->sums;
400 sums->bytenr = start;
403 offset = (start - key.offset) >>
404 root->fs_info->sb->s_blocksize_bits;
408 read_extent_buffer(path->nodes[0],
410 ((unsigned long)item) +
412 sector_sum->bytenr = start;
414 size -= root->sectorsize;
415 start += root->sectorsize;
419 list_add_tail(&sums->list, &tmplist);
425 while (ret < 0 && !list_empty(&tmplist)) {
426 sums = list_entry(&tmplist, struct btrfs_ordered_sum, list);
427 list_del(&sums->list);
430 list_splice_tail(&tmplist, list);
432 btrfs_free_path(path);
436 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
437 struct bio *bio, u64 file_start, int contig)
439 struct btrfs_ordered_sum *sums;
440 struct btrfs_sector_sum *sector_sum;
441 struct btrfs_ordered_extent *ordered;
443 struct bio_vec *bvec = bio->bi_io_vec;
445 unsigned long total_bytes = 0;
446 unsigned long this_sum_bytes = 0;
450 WARN_ON(bio->bi_vcnt <= 0);
451 sums = kzalloc(btrfs_ordered_sum_size(root, bio->bi_size), GFP_NOFS);
455 sector_sum = sums->sums;
456 disk_bytenr = (u64)bio->bi_sector << 9;
457 sums->len = bio->bi_size;
458 INIT_LIST_HEAD(&sums->list);
463 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
465 ordered = btrfs_lookup_ordered_extent(inode, offset);
466 BUG_ON(!ordered); /* Logic error */
467 sums->bytenr = ordered->start;
469 while (bio_index < bio->bi_vcnt) {
471 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
473 if (offset >= ordered->file_offset + ordered->len ||
474 offset < ordered->file_offset) {
475 unsigned long bytes_left;
476 sums->len = this_sum_bytes;
478 btrfs_add_ordered_sum(inode, ordered, sums);
479 btrfs_put_ordered_extent(ordered);
481 bytes_left = bio->bi_size - total_bytes;
483 sums = kzalloc(btrfs_ordered_sum_size(root, bytes_left),
485 BUG_ON(!sums); /* -ENOMEM */
486 sector_sum = sums->sums;
487 sums->len = bytes_left;
488 ordered = btrfs_lookup_ordered_extent(inode, offset);
489 BUG_ON(!ordered); /* Logic error */
490 sums->bytenr = ordered->start;
493 data = kmap_atomic(bvec->bv_page);
494 sector_sum->sum = ~(u32)0;
495 sector_sum->sum = btrfs_csum_data(data + bvec->bv_offset,
499 btrfs_csum_final(sector_sum->sum,
500 (char *)§or_sum->sum);
501 sector_sum->bytenr = disk_bytenr;
505 total_bytes += bvec->bv_len;
506 this_sum_bytes += bvec->bv_len;
507 disk_bytenr += bvec->bv_len;
508 offset += bvec->bv_len;
512 btrfs_add_ordered_sum(inode, ordered, sums);
513 btrfs_put_ordered_extent(ordered);
518 * helper function for csum removal, this expects the
519 * key to describe the csum pointed to by the path, and it expects
520 * the csum to overlap the range [bytenr, len]
522 * The csum should not be entirely contained in the range and the
523 * range should not be entirely contained in the csum.
525 * This calls btrfs_truncate_item with the correct args based on the
526 * overlap, and fixes up the key as required.
528 static noinline void truncate_one_csum(struct btrfs_trans_handle *trans,
529 struct btrfs_root *root,
530 struct btrfs_path *path,
531 struct btrfs_key *key,
534 struct extent_buffer *leaf;
535 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
537 u64 end_byte = bytenr + len;
538 u32 blocksize_bits = root->fs_info->sb->s_blocksize_bits;
540 leaf = path->nodes[0];
541 csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
542 csum_end <<= root->fs_info->sb->s_blocksize_bits;
543 csum_end += key->offset;
545 if (key->offset < bytenr && csum_end <= end_byte) {
550 * A simple truncate off the end of the item
552 u32 new_size = (bytenr - key->offset) >> blocksize_bits;
553 new_size *= csum_size;
554 btrfs_truncate_item(trans, root, path, new_size, 1);
555 } else if (key->offset >= bytenr && csum_end > end_byte &&
556 end_byte > key->offset) {
561 * we need to truncate from the beginning of the csum
563 u32 new_size = (csum_end - end_byte) >> blocksize_bits;
564 new_size *= csum_size;
566 btrfs_truncate_item(trans, root, path, new_size, 0);
568 key->offset = end_byte;
569 btrfs_set_item_key_safe(trans, root, path, key);
576 * deletes the csum items from the csum tree for a given
579 int btrfs_del_csums(struct btrfs_trans_handle *trans,
580 struct btrfs_root *root, u64 bytenr, u64 len)
582 struct btrfs_path *path;
583 struct btrfs_key key;
584 u64 end_byte = bytenr + len;
586 struct extent_buffer *leaf;
588 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
589 int blocksize_bits = root->fs_info->sb->s_blocksize_bits;
591 root = root->fs_info->csum_root;
593 path = btrfs_alloc_path();
598 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
599 key.offset = end_byte - 1;
600 key.type = BTRFS_EXTENT_CSUM_KEY;
602 path->leave_spinning = 1;
603 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
605 if (path->slots[0] == 0)
608 } else if (ret < 0) {
612 leaf = path->nodes[0];
613 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
615 if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
616 key.type != BTRFS_EXTENT_CSUM_KEY) {
620 if (key.offset >= end_byte)
623 csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
624 csum_end <<= blocksize_bits;
625 csum_end += key.offset;
627 /* this csum ends before we start, we're done */
628 if (csum_end <= bytenr)
631 /* delete the entire item, it is inside our range */
632 if (key.offset >= bytenr && csum_end <= end_byte) {
633 ret = btrfs_del_item(trans, root, path);
636 if (key.offset == bytenr)
638 } else if (key.offset < bytenr && csum_end > end_byte) {
639 unsigned long offset;
640 unsigned long shift_len;
641 unsigned long item_offset;
646 * Our bytes are in the middle of the csum,
647 * we need to split this item and insert a new one.
649 * But we can't drop the path because the
650 * csum could change, get removed, extended etc.
652 * The trick here is the max size of a csum item leaves
653 * enough room in the tree block for a single
654 * item header. So, we split the item in place,
655 * adding a new header pointing to the existing
656 * bytes. Then we loop around again and we have
657 * a nicely formed csum item that we can neatly
660 offset = (bytenr - key.offset) >> blocksize_bits;
663 shift_len = (len >> blocksize_bits) * csum_size;
665 item_offset = btrfs_item_ptr_offset(leaf,
668 memset_extent_buffer(leaf, 0, item_offset + offset,
673 * btrfs_split_item returns -EAGAIN when the
674 * item changed size or key
676 ret = btrfs_split_item(trans, root, path, &key, offset);
677 if (ret && ret != -EAGAIN) {
678 btrfs_abort_transaction(trans, root, ret);
682 key.offset = end_byte - 1;
684 truncate_one_csum(trans, root, path, &key, bytenr, len);
685 if (key.offset < bytenr)
688 btrfs_release_path(path);
692 btrfs_free_path(path);
696 static u64 btrfs_sector_sum_left(struct btrfs_ordered_sum *sums,
697 struct btrfs_sector_sum *sector_sum,
698 u64 total_bytes, u64 sectorsize)
700 u64 tmp = sectorsize;
701 u64 next_sector = sector_sum->bytenr;
702 struct btrfs_sector_sum *next = sector_sum + 1;
704 while ((tmp + total_bytes) < sums->len) {
705 if (next_sector + sectorsize != next->bytenr)
708 next_sector = next->bytenr;
714 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
715 struct btrfs_root *root,
716 struct btrfs_ordered_sum *sums)
720 struct btrfs_key file_key;
721 struct btrfs_key found_key;
725 struct btrfs_path *path;
726 struct btrfs_csum_item *item;
727 struct btrfs_csum_item *item_end;
728 struct extent_buffer *leaf = NULL;
730 struct btrfs_sector_sum *sector_sum;
733 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
735 path = btrfs_alloc_path();
739 sector_sum = sums->sums;
741 next_offset = (u64)-1;
743 file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
744 file_key.offset = sector_sum->bytenr;
745 bytenr = sector_sum->bytenr;
746 btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
748 item = btrfs_lookup_csum(trans, root, path, sector_sum->bytenr, 1);
750 leaf = path->nodes[0];
755 if (ret != -EFBIG && ret != -ENOENT)
760 /* we found one, but it isn't big enough yet */
761 leaf = path->nodes[0];
762 item_size = btrfs_item_size_nr(leaf, path->slots[0]);
763 if ((item_size / csum_size) >=
764 MAX_CSUM_ITEMS(root, csum_size)) {
765 /* already at max size, make a new one */
769 int slot = path->slots[0] + 1;
770 /* we didn't find a csum item, insert one */
771 nritems = btrfs_header_nritems(path->nodes[0]);
772 if (path->slots[0] >= nritems - 1) {
773 ret = btrfs_next_leaf(root, path);
780 btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot);
781 if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
782 found_key.type != BTRFS_EXTENT_CSUM_KEY) {
786 next_offset = found_key.offset;
792 * at this point, we know the tree has an item, but it isn't big
793 * enough yet to put our csum in. Grow it
795 btrfs_release_path(path);
796 ret = btrfs_search_slot(trans, root, &file_key, path,
802 if (path->slots[0] == 0)
807 leaf = path->nodes[0];
808 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
809 csum_offset = (bytenr - found_key.offset) >>
810 root->fs_info->sb->s_blocksize_bits;
812 if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY ||
813 found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
814 csum_offset >= MAX_CSUM_ITEMS(root, csum_size)) {
818 if (csum_offset == btrfs_item_size_nr(leaf, path->slots[0]) /
825 if (btrfs_leaf_free_space(root, leaf) <
826 sizeof(struct btrfs_item) + csum_size * 2)
829 free_space = btrfs_leaf_free_space(root, leaf) -
830 sizeof(struct btrfs_item) - csum_size;
831 tmp = btrfs_sector_sum_left(sums, sector_sum, total_bytes,
833 tmp >>= root->fs_info->sb->s_blocksize_bits;
836 extend_nr = max_t(int, 1, (int)tmp);
837 diff = (csum_offset + extend_nr) * csum_size;
838 diff = min(diff, MAX_CSUM_ITEMS(root, csum_size) * csum_size);
840 diff = diff - btrfs_item_size_nr(leaf, path->slots[0]);
841 diff = min(free_space, diff);
845 btrfs_extend_item(trans, root, path, diff);
850 btrfs_release_path(path);
855 tmp = btrfs_sector_sum_left(sums, sector_sum, total_bytes,
857 tmp >>= root->fs_info->sb->s_blocksize_bits;
858 tmp = min(tmp, (next_offset - file_key.offset) >>
859 root->fs_info->sb->s_blocksize_bits);
861 tmp = max((u64)1, tmp);
862 tmp = min(tmp, (u64)MAX_CSUM_ITEMS(root, csum_size));
863 ins_size = csum_size * tmp;
865 ins_size = csum_size;
867 path->leave_spinning = 1;
868 ret = btrfs_insert_empty_item(trans, root, path, &file_key,
870 path->leave_spinning = 0;
878 leaf = path->nodes[0];
879 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
881 item = (struct btrfs_csum_item *)((unsigned char *)item +
882 csum_offset * csum_size);
884 item_end = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
885 item_end = (struct btrfs_csum_item *)((unsigned char *)item_end +
886 btrfs_item_size_nr(leaf, path->slots[0]));
889 write_extent_buffer(leaf, §or_sum->sum, (unsigned long)item, csum_size);
891 total_bytes += root->sectorsize;
893 if (total_bytes < sums->len) {
894 item = (struct btrfs_csum_item *)((char *)item +
896 if (item < item_end && bytenr + PAGE_CACHE_SIZE ==
897 sector_sum->bytenr) {
898 bytenr = sector_sum->bytenr;
903 btrfs_mark_buffer_dirty(path->nodes[0]);
904 if (total_bytes < sums->len) {
905 btrfs_release_path(path);
910 btrfs_free_path(path);