f2fs: verify file type early in f2fs_fallocate

This patch changes to verify file type early in f2fs_fallocate for
cleanup, meanwhile this also fixes to add missing verification for
expand_inode_data.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/file.c

@@ -765,9 +765,6 @@ static int punch_hole(struct inode *inode, loff_t offset, loff_t len)
 	loff_t off_start, off_end;
 	int ret = 0;
 
-	if (!S_ISREG(inode->i_mode))
-		return -EOPNOTSUPP;
-
 	if (f2fs_has_inline_data(inode)) {
 		ret = f2fs_convert_inline_inode(inode);
 		if (ret)
@@ -908,9 +905,6 @@ static int f2fs_collapse_range(struct inode *inode, loff_t offset, loff_t len)
 	loff_t new_size;
 	int ret;
 
-	if (!S_ISREG(inode->i_mode))
-		return -EINVAL;
-
 	if (offset + len >= i_size_read(inode))
 		return -EINVAL;
 
@@ -959,9 +953,6 @@ static int f2fs_zero_range(struct inode *inode, loff_t offset, loff_t len,
 	loff_t off_start, off_end;
 	int ret = 0;
 
-	if (!S_ISREG(inode->i_mode))
-		return -EINVAL;
-
 	ret = inode_newsize_ok(inode, (len + offset));
 	if (ret)
 		return ret;
@@ -1068,9 +1059,6 @@ static int f2fs_insert_range(struct inode *inode, loff_t offset, loff_t len)
 	loff_t new_size;
 	int ret;
 
-	if (!S_ISREG(inode->i_mode))
-		return -EINVAL;
-
 	new_size = i_size_read(inode) + len;
 	if (new_size > inode->i_sb->s_maxbytes)
 		return -EFBIG;
@@ -1228,6 +1216,10 @@ static long f2fs_fallocate(struct file *file, int mode,
 	struct inode *inode = file_inode(file);
 	long ret = 0;
 
+	/* f2fs only support ->fallocate for regular file */
+	if (!S_ISREG(inode->i_mode))
+		return -EINVAL;
+
 	if (f2fs_encrypted_inode(inode) &&
 		(mode & (FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE)))
 		return -EOPNOTSUPP;