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

Al Viro · gregkh · commit f0d2e153147e · 2017-06-14T13:16:24.000+02:00
commit 006351ac8ead0d4a67dd3845e3ceffe650a23212 upstream.

Signed-off-by: Al Viro &lt;viro@zeniv.linux.org.uk&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;
diff --git 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 ....? */

Original file line number	Diff line number	Diff line change
`@@ -403,7 +403,9 @@ static int ufs_getfrag_block(struct inode *inode, sector_t fragment, struct buff`
`403`	`403`
`404`	`404`	`if (!create) {`
`405`	`405`	`phys64 = ufs_frag_map(inode, offsets, depth);`
`406`		`- goto out;`
	`406`	`+ if (phys64)`
	`407`	`+ map_bh(bh_result, sb, phys64 + frag);`
	`408`	`+ return 0;`
`407`	`409`	`}`
`408`	`410`
`409`	`411`	`/* This code entered only while writing ....? */`