btrfs: deprecate BTRFS_IOC_BALANCE ioctl

The v2 balance ioctl has been introduced more than 9 years ago. Users of
the old v1 ioctl should have long been migrated to it. It's time we
deprecate it and eventually remove it.

The only known user is in btrfs-progs that tries v1 as a fallback in
case v2 is not supported. This is not necessary anymore.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 92424a2..012fbfd 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3986,6 +3986,10 @@ static long btrfs_ioctl_balance(struct file *file, void __user *arg)
        bool need_unlock; /* for mut. excl. ops lock */
        int ret;
 
+       if (!arg)
+               btrfs_warn(fs_info,
+       "IOC_BALANCE ioctl (v1) is deprecated and will be removed in kernel 5.18");
+
        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;