introduce fs_context methods
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/super.c b/fs/super.c
index 5055323..76b3181 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);