btrfs: wait between incomplete batch memory allocations
When allocating memory in a loop, each iteration should call memalloc_retry_wait() in order to prevent starving memory-freeing processes (and to mark where allocation loops are). Other filesystems do that as well. The bulk page allocation is the only place in btrfs with an allocation retry loop, so add an appropriate call to it. Signed-off-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>