From: Stefan Agner <stefan@agner.ch>
Date: Mon, 1 Jul 2013 18:33:39 +0000 (+0200)
Subject: Btrfs: return -1 when lzo compression makes data bigger
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=59516f6017c589e7316418fda6128ba8f829a77f;p=linux-beck.git

Btrfs: return -1 when lzo compression makes data bigger

With this fix the lzo code behaves like the zlib code by returning an
error
code when compression does not help reduce the size of the file.
This is currently not a bug since the compressed size is checked again
in
the calling method compress_file_range.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
---

diff --git a/fs/btrfs/lzo.c b/fs/btrfs/lzo.c
index f93151a98886..b6a6f07c5ce2 100644
--- a/fs/btrfs/lzo.c
+++ b/fs/btrfs/lzo.c
@@ -207,8 +207,10 @@ static int lzo_compress_pages(struct list_head *ws,
 		}
 
 		/* we're making it bigger, give up */
-		if (tot_in > 8192 && tot_in < tot_out)
+		if (tot_in > 8192 && tot_in < tot_out) {
+			ret = -1;
 			goto out;
+		}
 
 		/* we're all done */
 		if (tot_in >= len)