From: Yan <yanzheng@21cn.com>
Date: Fri, 14 Dec 2007 16:14:42 +0000 (-0500)
Subject: Off by one fix for btrfs_drop_extents
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=6e3b96668eb34da6060a5189e6a73e9d62a3b178;p=openwrt%2Fstaging%2Fblogic.git

Off by one fix for btrfs_drop_extents

One of my old patches introduces a new bug to
btrfs_drop_extents(changeset 275). Inline extents are not truncated
properly when "extent_end == end", it can trigger the BUG_ON at
file.c:600.  I hope I don't introduce new bug this time.

---

Signed-off-by: Chris Mason <chris.mason@oracle.com>
---

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 1cc4d285951c..a280b9562221 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -481,8 +481,9 @@ next_slot:
 			search_start = (extent_end + mask) & ~mask;
 		} else
 			search_start = extent_end;
-		if (end < extent_end && start > key.offset && found_inline) {
+		if (end <= extent_end && start >= key.offset && found_inline) {
 			*hint_byte = EXTENT_MAP_INLINE;
+			continue;
 		}
 		if (end < extent_end && end >= key.offset) {
 			if (found_extent) {