From: Ming Lei <ming.lei@redhat.com>
To: Uday Shankar <ushankar@purestorage.com>
Cc: Jens Axboe <axboe@kernel.dk>, Alasdair Kergon <agk@redhat.com>,
Mike Snitzer <snitzer@kernel.org>,
Christoph Hellwig <hch@infradead.org>,
Keith Busch <kbusch@kernel.org>,
linux-block@vger.kernel.org, dm-devel@redhat.com,
kernel test robot <lkp@intel.com>
Subject: Re: [PATCH v3] blk-mq: enforce op-specific segment limits in blk_insert_cloned_request
Date: Thu, 2 Mar 2023 09:57:13 +0800 [thread overview]
Message-ID: <ZAACeb0/Pfw8XN3a@T590> (raw)
In-Reply-To: <20230301000655.48112-1-ushankar@purestorage.com>
On Tue, Feb 28, 2023 at 05:06:55PM -0700, Uday Shankar wrote:
> The block layer might merge together discard requests up until the
> max_discard_segments limit is hit, but blk_insert_cloned_request checks
> the segment count against max_segments regardless of the req op. This
> can result in errors like the following when discards are issued through
> a DM device and max_discard_segments exceeds max_segments for the queue
> of the chosen underlying device.
>
> blk_insert_cloned_request: over max segments limit. (256 > 129)
>
> Fix this by looking at the req_op and enforcing the appropriate segment
> limit - max_discard_segments for REQ_OP_DISCARDs and max_segments for
> everything else.
>
> Signed-off-by: Uday Shankar <ushankar@purestorage.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Thanks,
Ming
next prev parent reply other threads:[~2023-03-02 1:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-01 0:06 [PATCH v3] blk-mq: enforce op-specific segment limits in blk_insert_cloned_request Uday Shankar
2023-03-01 0:33 ` Keith Busch
2023-03-02 1:57 ` Ming Lei [this message]
2023-03-03 4:00 ` Jens Axboe
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