[PATCH 4/4] Btrfs: fix wrong return value of btrfs_lookup_csum()

[Miao Xie]

If we don't find the expected csum item, but find a csum item which is
adjacent to the specified extent, we should return -EFBIG, or we should
return -ENOENT. But btrfs_lookup_csum() return -EFBIG even the csum item
is not adjacent to the specified extent. Fix it.

Signed-off-by: Miao Xie <mi...@cn.fujitsu.com>
---
 fs/btrfs/file-item.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 9a447bc..bc89e2f 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -117,9 +117,11 @@ struct btrfs_csum_item *btrfs_lookup_csum(struct 
btrfs_trans_handle *trans,
                csums_in_item = btrfs_item_size_nr(leaf, path->slots[0]);
                csums_in_item /= csum_size;
 
-               if (csum_offset >= csums_in_item) {
+               if (csum_offset == csums_in_item) {
                        ret = -EFBIG;
                        goto fail;
+               } else if (csum_offset > csums_in_item) {
+                       goto fail;
                }
        }
        item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
-- 
1.8.0.1
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