From: Yan <yanzheng@21cn.com>
Date: Tue, 22 Jan 2008 17:46:56 +0000 (-0500)
Subject: Btrfs: Fix for test_range_bit
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f0c5da1446cc500856a5e31c9a0e2a7bdd30e663;p=linux-beck.git

Btrfs: Fix for test_range_bit

test_range_bit doesn't properly handle the case: there's a hole at the
end of the range and there's no other extent_state after the range.

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

diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index d71aed341abd..485cf0719b3c 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -1336,6 +1336,11 @@ int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end,
 		if (start > end)
 			break;
 		node = rb_next(node);
+		if (!node) {
+			if (filled)
+				bitset = 0;
+			break;
+		}
 	}
 	read_unlock_irq(&tree->lock);
 	return bitset;