From: Chris Mason <chris.mason@oracle.com>
Date: Thu, 26 May 2011 21:43:59 +0000 (-0400)
Subject: Btrfs: return -ENOMEM in clear_extent_bit
X-Git-Tag: firefly_0821_release~7613^2~914^2~32
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c309df07868baa8b05d2a70637096465746fdbb5;p=firefly-linux-kernel-4.4.55.git

Btrfs: return -ENOMEM in clear_extent_bit

The btrfs releasepage function depends on ENOMEM coming
back when it is called atomic.

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

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index a90c4a12556b..0e0fe0f6ec75 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -485,7 +485,8 @@ int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 again:
 	if (!prealloc && (mask & __GFP_WAIT)) {
 		prealloc = alloc_extent_state(mask);
-		BUG_ON(!prealloc);
+		if (!prealloc)
+			return -ENOMEM;
 	}
 
 	spin_lock(&tree->lock);