btrfs: Deprecate BTRFS_SUBVOL_CREATE_ASYNC flag
Support for asynchronous snapshot creation was originally added in 72fd032e ("Btrfs: add SNAP_CREATE_ASYNC ioctl") to cater for ceph's backend needs. However, since Ceph has deprecated support for btrfs there is no longer need for that support in btrfs. Additionally, this was never supported by btrfs-progs, the official userspace tools. Reviewed-by: NQu Wenruo <wqu@suse.com> Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de> Signed-off-by: NNikolay Borisov <nborisov@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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