On Wed, Dec 18, 2013 at 8:12 PM, Kent Overstreet <kmo@xxxxxxxxxxxxx> wrote:
> Now that we've got code for raid5/6 stripe awareness, bcache just needs
> to know about the stripes and when writing partial stripes is expensive
> - we probably don't want to enable this optimization for raid1 or 10,
> even though they have stripes. So add a flag to queue_limits.
>
> Signed-off-by: Kent Overstreet <kmo@xxxxxxxxxxxxx>
> ---
> This is in my pile of bcache stuff queued up for 3.14 - if no one objects it'll
> be in my bcache pull request:
>
> drivers/md/bcache/super.c | 6 ++++++
> drivers/md/raid5.c | 1 +
> include/linux/blkdev.h | 1 +
> 3 files changed, 8 insertions(+)
Hi Kent,
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 02cb6f0ea7..0375654adb 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -291,6 +291,7 @@ struct queue_limits {
> unsigned char discard_misaligned;
> unsigned char cluster;
> unsigned char discard_zeroes_data;
> + unsigned char raid_partial_stripes_expensive;
> };
>
> struct request_queue {
If you add a new member to queue_limits you need to update
blk_stack_limits() so that it propagates as you stack devices.
You probably also want to update blk_set_default_limits.
Mike
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