xfs: merge xfs_mkdir into xfs_create

xfs_create and xfs_mkdir only have minor differences, so merge both of them
into a sigle function.  While we're at it also make the error handling code
more straight-forward.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Dave Chinner <david@fromorbit.com>

fs/xfs/linux-2.6/xfs_iops.c

@@ -211,8 +211,13 @@ xfs_vn_mknod(
 	 * Irix uses Missed'em'V split, but doesn't want to see
 	 * the upper 5 bits of (14bit) major.
 	 */
-	if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
-		return -EINVAL;
+	if (S_ISCHR(mode) || S_ISBLK(mode)) {
+		if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
+			return -EINVAL;
+		rdev = sysv_encode_dev(rdev);
+	} else {
+		rdev = 0;
+	}
 
 	if (test_default_acl && test_default_acl(dir)) {
 		if (!_ACL_ALLOC(default_acl)) {
@@ -224,28 +229,11 @@ xfs_vn_mknod(
 		}
 	}
 
-	xfs_dentry_to_name(&name, dentry);
-
 	if (IS_POSIXACL(dir) && !default_acl)
 		mode &= ~current->fs->umask;
 
-	switch (mode & S_IFMT) {
-	case S_IFCHR:
-	case S_IFBLK:
-	case S_IFIFO:
-	case S_IFSOCK:
-		rdev = sysv_encode_dev(rdev);
-	case S_IFREG:
-		error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip, NULL);
-		break;
-	case S_IFDIR:
-		error = xfs_mkdir(XFS_I(dir), &name, mode, &ip, NULL);
-		break;
-	default:
-		error = EINVAL;
-		break;
-	}
-
+	xfs_dentry_to_name(&name, dentry);
+	error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip, NULL);
 	if (unlikely(error))
 		goto out_free_acl;
 

fs/xfs/xfs_vnodeops.h

@@ -31,8 +31,6 @@ int xfs_remove(struct xfs_inode *dp, struct xfs_name *name,
 		struct xfs_inode *ip);
 int xfs_link(struct xfs_inode *tdp, struct xfs_inode *sip,
 		struct xfs_name *target_name);
-int xfs_mkdir(struct xfs_inode *dp, struct xfs_name *dir_name,
-		mode_t mode, struct xfs_inode **ipp, cred_t *credp);
 int xfs_readdir(struct xfs_inode	*dp, void *dirent, size_t bufsize,
 		       xfs_off_t *offset, filldir_t filldir);
 int xfs_symlink(struct xfs_inode *dp, struct xfs_name *link_name,