Btrfs: properly check free space for tree balancing
btrfs_insert_empty_items takes the space needed by the btrfs_item
structure into account when calculating the required free space.
So the tree balancing code shouldn't add sizeof(struct btrfs_item)
to the size when checking the free space. This patch removes these
superfluous additions.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 7acadf3..cc6e0b6 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -300,6 +300,10 @@
size = btrfs_item_size_nr(leaf, path->slots[0]);
csum_end = key.offset + (size / csum_size) * root->sectorsize;
+ if (csum_end <= start) {
+ path->slots[0]++;
+ continue;
+ }
size = min(csum_end, end + 1) - start;
sums = kzalloc(btrfs_ordered_sum_size(root, size), GFP_NOFS);