btrfs: un-deprecate ioctls START_SYNC and WAIT_SYNC
The two ioctls START_SYNC and WAIT_SYNC were mistakenly marked as deprecated and scheduled for removal but we actualy do use them for 'btrfs subvolume delete -C/-c'. The deprecated thing in ebc87351 should have been just the async flag for subvolume creation. The deprecation has been added in this development cycle, remove it until it's time. Fixes: ebc87351 ("btrfs: Deprecate BTRFS_SUBVOL_CREATE_ASYNC flag") Signed-off-by: David Sterba <dsterba@suse.com>
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