LSM: lift parsing LSM options into the caller of ->sb_kern_mount()

This paves the way for retaining the LSM options from a common filesystem
mount context during a mount parameter parsing phase to be instituted prior
to actual mount/reconfiguration actions.

Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 4bd6f94..ba229d4 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2897,30 +2897,12 @@
 	goto out_free_opts;
 }
 
-static int selinux_sb_kern_mount(struct super_block *sb, int flags, void *data)
+static int selinux_sb_kern_mount(struct super_block *sb, int flags,
+				 struct security_mnt_opts *opts)
 {
-	char *options = data;
 	const struct cred *cred = current_cred();
 	struct common_audit_data ad;
-	int rc = 0;
-	struct security_mnt_opts opts;
-
-	security_init_mnt_opts(&opts);
-
-	if (!data)
-		goto out;
-
-	BUG_ON(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA);
-
-	rc = selinux_parse_opts_str(options, &opts);
-	if (rc)
-		goto out_err;
-
-out:
-	rc = selinux_set_mnt_opts(sb, &opts, 0, NULL);
-
-out_err:
-	security_free_mnt_opts(&opts);
+	int rc = selinux_set_mnt_opts(sb, opts, 0, NULL);
 	if (rc)
 		return rc;