xfs: factor out a xfs_dir_lookup_args helper

Add a helper to switch between the different directory formats for
lookup and to handle the -EEXIST return for a successful lookup.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>

fs/xfs/libxfs/xfs_dir2.c

@@ -352,6 +352,45 @@ xfs_dir_cilookup_result(
 	return -EEXIST;
 }
 
+int
+xfs_dir_lookup_args(
+	struct xfs_da_args	*args)
+{
+	bool			is_block, is_leaf;
+	int			error;
+
+	if (args->dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
+		error = xfs_dir2_sf_lookup(args);
+		goto out;
+	}
+
+	/* dir2 functions require that the data fork is loaded */
+	error = xfs_iread_extents(args->trans, args->dp, XFS_DATA_FORK);
+	if (error)
+		goto out;
+
+	error = xfs_dir2_isblock(args, &is_block);
+	if (error)
+		goto out;
+
+	if (is_block) {
+		error = xfs_dir2_block_lookup(args);
+		goto out;
+	}
+
+	error = xfs_dir2_isleaf(args, &is_leaf);
+	if (error)
+		goto out;
+	if (is_leaf)
+		error = xfs_dir2_leaf_lookup(args);
+	else
+		error = xfs_dir2_node_lookup(args);
+out:
+	if (error != -EEXIST)
+		return error;
+	return 0;
+}
+
 /*
  * Lookup a name in a directory, give back the inode number.
  * If ci_name is not NULL, returns the actual name in ci_name if it differs
@@ -368,7 +407,6 @@ xfs_dir_lookup(
 {
 	struct xfs_da_args	*args;
 	int			rval;
-	bool			v;
 	int			lock_mode;
 
 	ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
@@ -390,30 +428,7 @@ xfs_dir_lookup(
 		args->op_flags |= XFS_DA_OP_CILOOKUP;
 
 	lock_mode = xfs_ilock_data_map_shared(dp);
-	if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
-		rval = xfs_dir2_sf_lookup(args);
-		goto out_check_rval;
-	}
-
-	rval = xfs_dir2_isblock(args, &v);
-	if (rval)
-		goto out_free;
-	if (v) {
-		rval = xfs_dir2_block_lookup(args);
-		goto out_check_rval;
-	}
-
-	rval = xfs_dir2_isleaf(args, &v);
-	if (rval)
-		goto out_free;
-	if (v)
-		rval = xfs_dir2_leaf_lookup(args);
-	else
-		rval = xfs_dir2_node_lookup(args);
-
-out_check_rval:
-	if (rval == -EEXIST)
-		rval = 0;
+	rval = xfs_dir_lookup_args(args);
 	if (!rval) {
 		*inum = args->inumber;
 		if (ci_name) {
@@ -421,7 +436,6 @@ xfs_dir_lookup(
 			ci_name->len = args->valuelen;
 		}
 	}
-out_free:
 	xfs_iunlock(dp, lock_mode);
 	kfree(args);
 	return rval;

fs/xfs/libxfs/xfs_dir2.h

@@ -66,6 +66,8 @@ extern int xfs_dir_replace(struct xfs_trans *tp, struct xfs_inode *dp,
 extern int xfs_dir_canenter(struct xfs_trans *tp, struct xfs_inode *dp,
 				struct xfs_name *name);
 
+int xfs_dir_lookup_args(struct xfs_da_args *args);
+
 /*
  * Direct call from the bmap code, bypassing the generic directory layer.
  */

fs/xfs/scrub/readdir.c

@@ -328,7 +328,6 @@ xchk_dir_lookup(
 		.op_flags	= XFS_DA_OP_OKNOENT,
 		.owner		= dp->i_ino,
 	};
-	bool			isblock, isleaf;
 	int			error;
 
 	if (xfs_is_shutdown(dp->i_mount))
@@ -344,39 +343,7 @@ xchk_dir_lookup(
 	ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
 	xfs_assert_ilocked(dp, XFS_ILOCK_SHARED | XFS_ILOCK_EXCL);
 
-	if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
-		error = xfs_dir2_sf_lookup(&args);
-		goto out_check_rval;
-	}
-
-	/* dir2 functions require that the data fork is loaded */
-	error = xfs_iread_extents(sc->tp, dp, XFS_DATA_FORK);
-	if (error)
-		return error;
-
-	error = xfs_dir2_isblock(&args, &isblock);
-	if (error)
-		return error;
-
-	if (isblock) {
-		error = xfs_dir2_block_lookup(&args);
-		goto out_check_rval;
-	}
-
-	error = xfs_dir2_isleaf(&args, &isleaf);
-	if (error)
-		return error;
-
-	if (isleaf) {
-		error = xfs_dir2_leaf_lookup(&args);
-		goto out_check_rval;
-	}
-
-	error = xfs_dir2_node_lookup(&args);
-
-out_check_rval:
-	if (error == -EEXIST)
-		error = 0;
+	error = xfs_dir_lookup_args(&args);
 	if (!error)
 		*ino = args.inumber;
 	return error;