[dm-devel] [PATCH v4 6/7] dm: Directly disable max_allocate_sectors for now
Mike Snitzer
snitzer at redhat.com
Tue Jan 21 12:24:59 UTC 2020
On Tue, Jan 21 2020 at 5:42am -0500,
Kirill Tkhai <ktkhai at virtuozzo.com> wrote:
> Since dm inherits limits from underlining block devices,
> this patch directly disables max_allocate_sectors for dm
> till full allocation support is implemented.
>
> This prevents high-level primitives (generic_make_request_checks(),
> __blkdev_issue_write_zeroes(), ...) from sending REQ_ALLOCATE
> requests.
>
> Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>
> ---
> drivers/md/dm-table.c | 2 ++
> drivers/md/md.h | 1 +
> 2 files changed, 3 insertions(+)
You're mixing DM and MD changes in the same patch.
But I'm wondering if it might be best to set this default for stacking
devices in blk_set_stacking_limits()?
And then it is up to each stacking driver to override as needed.
Mike
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