From: Liu Bo <bo.li.liu@oracle.com>
Date: Wed, 1 May 2013 16:23:41 +0000 (+0000)
Subject: Btrfs: fix off-by-one in fiemap
X-Git-Tag: submit/tizen_common/20140905.094502~2561^2~86^2~22
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a52f4cd2b1a863a42c1cb268b1cddad451cdfede;p=sdk%2Femulator%2Femulator-kernel.git

Btrfs: fix off-by-one in fiemap

lock_extent/unlock_extent expect an exclusive end.

Tested-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
---

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index d2ac518..3e6e410 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3989,7 +3989,7 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 		last_for_get_extent = isize;
 	}
 
-	lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len, 0,
+	lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len - 1, 0,
 			 &cached_state);
 
 	em = get_extent_skip_holes(inode, start, last_for_get_extent,
@@ -4076,7 +4076,7 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 out_free:
 	free_extent_map(em);
 out:
-	unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len,
+	unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len - 1,
 			     &cached_state, GFP_NOFS);
 	return ret;
 }