introduce fs_context methods

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 28 insertions, 8 deletions

diff --git a/fs/super.c b/fs/super.c
index 50553233dd15..76b3181c782d 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -894,13 +894,15 @@ int reconfigure_super(struct fs_context *fc)
 		}
 	}
 
-	retval = legacy_reconfigure(fc);
-	if (retval) {
-		if (!force)
-			goto cancel_readonly;
-		/* If forced remount, go ahead despite any errors */
-		WARN(1, "forced remount of a %s fs returned %i\n",
-		     sb->s_type->name, retval);
+	if (fc->ops->reconfigure) {
+		retval = fc->ops->reconfigure(fc);
+		if (retval) {
+			if (!force)
+				goto cancel_readonly;
+			/* If forced remount, go ahead despite any errors */
+			WARN(1, "forced remount of a %s fs returned %i\n",
+			     sb->s_type->name, retval);
+		}
 	}
 
 	WRITE_ONCE(sb->s_flags, ((sb->s_flags & ~fc->sb_flags_mask) |
@@ -1294,10 +1296,28 @@ int vfs_get_tree(struct fs_context *fc)
 	struct super_block *sb;
 	int error;
 
-	error = legacy_get_tree(fc);
+	if (fc->fs_type->fs_flags & FS_REQUIRES_DEV && !fc->source)
+		return -ENOENT;
+
+	if (fc->root)
+		return -EBUSY;
+
+	/* Get the mountable root in fc->root, with a ref on the root and a ref
+	 * on the superblock.
+	 */
+	error = fc->ops->get_tree(fc);
 	if (error < 0)
 		return error;
 
+	if (!fc->root) {
+		pr_err("Filesystem %s get_tree() didn't set fc->root\n",
+		       fc->fs_type->name);
+		/* We don't know what the locking state of the superblock is -
+		 * if there is a superblock.
+		 */
+		BUG();
+	}
+
 	sb = fc->root->d_sb;
 	WARN_ON(!sb->s_bdi);