quota: explicitly set ->dq_op and ->s_qcop

Only set the quota operation vectors if the filesystem actually supports
quota instead of doing it for all filesystems in alloc_super().

[Jan Kara: Export dquot_operations and vfs_quotactl_ops]

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 6 insertions, 0 deletions

diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index b9b77c3e7ae0..df752b71b869 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -1065,6 +1065,12 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
         sb->s_op = &ext2_sops;
         sb->s_export_op = &ext2_export_ops;
         sb->s_xattr = ext2_xattr_handlers;
+
+#ifdef CONFIG_QUOTA
+        sb->dq_op = &dquot_operations;
+        sb->s_qcop = &vfs_quotactl_ops;
+#endif
+
         root = ext2_iget(sb, EXT2_ROOT_INO);
         if (IS_ERR(root)) {
                 ret = PTR_ERR(root);