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definitions=2023-03-24_11,2023-03-28_02,2023-02-09_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 mlxscore=0 malwarescore=0 mlxlogscore=999 phishscore=0 bulkscore=0 spamscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2303200000 definitions=main-2303280134 X-Proofpoint-ORIG-GUID: uYTDee_dHYpaiV4g25dN4xqp2ZTTqBBp X-Proofpoint-GUID: uYTDee_dHYpaiV4g25dN4xqp2ZTTqBBp X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 X-Mailman-Approved-At: Wed, 29 Mar 2023 06:05:27 +0000 Subject: Re: [dm-devel] [PATCH v5 01/18] block: Add PR callouts for read keys and reservation X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: axboe@kernel.dk, linux-block@vger.kernel.org, chaitanyak@nvidia.com, Chaitanya Kulkarni , bvanassche@acm.org, linux-scsi@vger.kernel.org, linux-nvme@lists.infradead.org, james.bottomley@hansenpartnership.com, dm-devel@redhat.com, target-devel@vger.kernel.org, martin.petersen@oracle.com, kbusch@kernel.org, hch@lst.de Errors-To: dm-devel-bounces@redhat.com Sender: "dm-devel" X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: oracle.com Content-Language: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On 3/28/23 11:36 AM, Mike Snitzer wrote: > On Fri, Mar 24 2023 at 2:17P -0400, > Mike Christie wrote: > >> Add callouts for reading keys and reservations. This allows LIO to support >> the READ_KEYS and READ_RESERVATION commands and will allow dm-multipath >> to optimize it's error handling so it can check if it's getting an error >> because there's an existing reservation or if we need to retry different >> paths. > > Not seeing anything in DM's path selectors that adds these > optimizations. Is there accompanying multipath-tools callouts to get > at this data to optimize path selection (via DM table reloads)? > You can ignore that comment. The comment was meant for the dm pr callouts and not for normal IO/path handling, and now I think I can fix in a different way. I originally added the comment about better dm error handling for something like __dm_pr_register getting a failure when it did: ret = ops->pr_register(dev->bdev, pr->old_key, pr->new_key, pr->flags); Right now, we fail the entire operation if just one call on one path fails. With the pr_read_keys/reservation callouts we could check if we got a failure because there was an existing reservation vs a retryable/ignorable error. I forgot I wrote that comment about dm in the mail and we actually don't need the pr_read_* callouts for that type of thing now, because I ended up changing the existing callouts to return common error codes last kernel. So I have another patchset that I'm working on, but am still debating about some issues like: ret = ops->pr_register(dev->bdev, pr->old_key, pr->new_key, pr->flags); switch (ret) { case PR_STS_RESERVATION_CONFLICT: pr->ret = ret; return -1; case PR_STS_RETRY_PATH_FAILURE: /* * We probably want to retry like how we do for the pg_init. */ .... case PR_STS_PATH_FAILED: case PR_STS_PATH_FAST_FAILED: /* * I'm still not sure what to do here, because if this is the last * host then we might want to try and register the rest of the paths * and limp on. It probably needs a user config option. */ .... -- dm-devel mailing list dm-devel@redhat.com https://listman.redhat.com/mailman/listinfo/dm-devel