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btrfs: deprecate BTRFS_IOC_BALANCE ioctl

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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>
This commit is contained in:
Nikolay Borisov 2021-11-10 13:41:04 +02:00 committed by David Sterba
parent d08e38b623
commit 6c405b2409
1 changed files with 4 additions and 0 deletions
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4
fs/btrfs/ioctl.c
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@ -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;