[PATCH v3 09/16] xfs: mount-api - add xfs_get_tree()

[Ian Kent <raven@themaw.net>]

Add the fs_context_operations method .get_tree that validates
mount options and fills the super block as previously done
by the file_system_type .mount method.

Signed-off-by: Ian Kent <raven@themaw.net>
---
 fs/xfs/xfs_super.c |   45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 9cf5c85d1341..3a4c724de1cc 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1931,6 +1931,51 @@ xfs_fs_fill_super(
 	return error;
 }
 
+STATIC int
+xfs_fill_super(
+	struct super_block	*sb,
+	struct fs_context	*fc)
+{
+	struct xfs_fs_context	*ctx = fc->fs_private;
+	struct xfs_mount	*mp = sb->s_fs_info;
+	int			silent = fc->sb_flags & SB_SILENT;
+	int			error = -ENOMEM;
+
+	mp->m_super = sb;
+
+	/*
+	 * set up the mount name first so all the errors will refer to the
+	 * correct device.
+	 */
+	mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
+	if (!mp->m_fsname)
+		return -ENOMEM;
+	mp->m_fsname_len = strlen(mp->m_fsname) + 1;
+
+	error = xfs_validate_params(mp, ctx, false);
+	if (error)
+		goto out_free_fsname;
+
+	error = __xfs_fs_fill_super(mp, silent);
+	if (error)
+		goto out_free_fsname;
+
+	return 0;
+
+ out_free_fsname:
+	sb->s_fs_info = NULL;
+	xfs_free_fsname(mp);
+
+	return error;
+}
+
+STATIC int
+xfs_get_tree(
+	struct fs_context	*fc)
+{
+	return vfs_get_block_super(fc, xfs_fill_super);
+}
+
 STATIC void
 xfs_fs_put_super(
 	struct super_block	*sb)