knfsd: exportfs: untangle ISDIR logic in find_exported_dentry

Rework some logic in find_exported_dentry so that we only have a single
S_ISDIR check and logic that makes clear to the reader what we're really doing
here.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NNeil Brown <neilb@suse.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

fs/exportfs/expfs.c

@@ -116,30 +116,23 @@ find_exported_dentry(struct super_block *sb, void *obj, void *parent,
 	if (IS_ERR(result))
 		return result;
 
-	if (S_ISDIR(result->d_inode->i_mode) &&
-	    (result->d_flags & DCACHE_DISCONNECTED)) {
-		/* it is an unconnected directory, we must connect it */
-		;
-	} else {
-		if (acceptable(context, result))
-			return result;
-		if (S_ISDIR(result->d_inode->i_mode)) {
+	if (S_ISDIR(result->d_inode->i_mode)) {
+		if (!(result->d_flags & DCACHE_DISCONNECTED)) {
+			if (acceptable(context, result))
+				return result;
 			err = -EACCES;
 			goto err_result;
 		}
 
+		target_dir = dget(result);
+	} else {
+		if (acceptable(context, result))
+			return result;
+
 		alias = find_acceptable_alias(result, acceptable, context);
 		if (alias)
 			return alias;
-	}			
 
-	/* It's a directory, or we are required to confirm the file's
-	 * location in the tree based on the parent information
- 	 */
-	dprintk("find_exported_dentry: need to look harder for %s/%d\n",sb->s_id,*(int*)obj);
-	if (S_ISDIR(result->d_inode->i_mode))
-		target_dir = dget(result);
-	else {
 		if (parent == NULL)
 			goto err_result;
 
@@ -149,6 +142,7 @@ find_exported_dentry(struct super_block *sb, void *obj, void *parent,
 			goto err_result;
 		}
 	}
+
 	/*
 	 * Now we need to make sure that target_dir is properly connected.
 	 * It may already be, as the flag isn't always updated when connection