On Tue, Dec 21, 2021 at 10:14:56PM +0800, Ming Lei wrote:
> Hello,
>
> dm-rq may be built on blk-mq device which marks BLK_MQ_F_BLOCKING, so
> dm_mq_queue_rq() may become to sleep current context.
>
> Fixes the issue by allowing dm-rq to set BLK_MQ_F_BLOCKING in case that
> any underlying queue i
dm request based driver doesn't set BLK_MQ_F_BLOCKING, so dm_queue_rq()
is supposed to not sleep.
However, blk_insert_cloned_request() is used by dm_queue_rq() for
queuing underlying request, but the underlying queue may be marked as
BLK_MQ_F_BLOCKING, so blk_insert_cloned_request() may become to
Add blk_alloc_disk_srcu() so that we can allocate srcu inside request queue
for supporting blocking ->queue_rq().
dm-rq needs this API.
Signed-off-by: Ming Lei
---
block/genhd.c | 5 +++--
include/linux/genhd.h | 12
2 files changed, 11 insertions(+), 6 deletions(-)
diff
Now we reuse queue flag of QUEUE_FLAG_HAS_SRCU for both having srcu and
BLK_MQ_F_BLOCKING. Actually they are two things: one is that srcu is
allocated inside queue, another is that we need to handle blocking
->queue_rq. So far this way works as expected.
dm-rq needs to set BLK_MQ_F_BLOCKING if any
Hello,
dm-rq may be built on blk-mq device which marks BLK_MQ_F_BLOCKING, so
dm_mq_queue_rq() may become to sleep current context.
Fixes the issue by allowing dm-rq to set BLK_MQ_F_BLOCKING in case that
any underlying queue is marked as BLK_MQ_F_BLOCKING.
DM request queue is allocated before all
On 2021-10-27 17:21, Paul Moore wrote:
> On Wed, Oct 27, 2021 at 4:57 PM Mike Snitzer wrote:
> >
> > On Tue, Oct 26 2021 at 10:22P -0400,
> > Paul Moore wrote:
> >
> > > On Tue, Oct 19, 2021 at 9:17 PM Paul Moore wrote:
> > > > On Tue, Oct 19, 2021 at 9:15 PM Paul Moore wrote:
> > > > >
> > > >
