From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 9 Jun 2017 03:28:53 +0000 (-0400)
Subject: ufs_getfrag_block(): we only grab ->truncate_mutex on block creation path
X-Git-Tag: release-20171130_firefly~4^2~100^2~1^2~4^2~31
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=f0d2e153147ece8c1027b276b71b8ffca0245440;p=firefly-linux-kernel-4.4.55.git

ufs_getfrag_block(): we only grab ->truncate_mutex on block creation path

commit 006351ac8ead0d4a67dd3845e3ceffe650a23212 upstream.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c
index 2ceccec0b609..1f69bb9b1e9d 100644
--- a/fs/ufs/inode.c
+++ b/fs/ufs/inode.c
@@ -403,7 +403,9 @@ static int ufs_getfrag_block(struct inode *inode, sector_t fragment, struct buff
 
 	if (!create) {
 		phys64 = ufs_frag_map(inode, offsets, depth);
-		goto out;
+		if (phys64)
+			map_bh(bh_result, sb, phys64 + frag);
+		return 0;
 	}
 
         /* This code entered only while writing ....? */