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Fri, 3 Jun 2022 06:55:49 +0000 Received: from DM5PR10MB1466.namprd10.prod.outlook.com ([fe80::f81d:b8ef:c5a4:9c9b]) by DM5PR10MB1466.namprd10.prod.outlook.com ([fe80::f81d:b8ef:c5a4:9c9b%3]) with mapi id 15.20.5293.019; Fri, 3 Jun 2022 06:55:49 +0000 From: Mike Christie To: linux-block@vger.kernel.org, dm-devel@redhat.com, snitzer@kernel.org, hch@lst.de, axboe@kernel.dk, martin.petersen@oracle.com, james.bottomley@hansenpartnership.com, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org Cc: Mike Christie Subject: [PATCH 04/11] block: Add PR callouts for read keys and reservation Date: Fri, 3 Jun 2022 01:55:29 -0500 Message-Id: <20220603065536.5641-5-michael.christie@oracle.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220603065536.5641-1-michael.christie@oracle.com> References: <20220603065536.5641-1-michael.christie@oracle.com> X-ClientProxiedBy: DM5PR16CA0012.namprd16.prod.outlook.com (2603:10b6:3:c0::22) To DM5PR10MB1466.namprd10.prod.outlook.com (2603:10b6:3:b::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: b3834d5f-bc5a-49ad-b456-08da452e176a X-MS-TrafficTypeDiagnostic: BYAPR10MB2789:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Note: This only initially adds the struct definitions in the kernel as I'm not sure if we wanted to export the interface to userspace yet. We may want to refine internally for LIO and when we can enable it for NVMe then add the finished interface to userspace. The latter is not done, because NVMe's report reservation command is similar to SCSI's read full status where they return a remote and local ID as well as the key/reservation info. However, a lot of SCSI devices don't do remote/local ID parts correctly. It seems that read full status might not be used very often so does not get a lot of testing. Signed-off-by: Mike Christie --- include/linux/pr.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/include/linux/pr.h b/include/linux/pr.h index 94ceec713afe..21a8eb8b34b5 100644 --- a/include/linux/pr.h +++ b/include/linux/pr.h @@ -4,6 +4,18 @@ #include +struct pr_keys { + u32 generation; + u32 num_keys; + u64 keys[]; +}; + +struct pr_held_reservation { + u64 key; + u32 type; + u32 generation; +}; + struct pr_ops { int (*pr_register)(struct block_device *bdev, u64 old_key, u64 new_key, u32 flags); @@ -14,6 +26,10 @@ struct pr_ops { int (*pr_preempt)(struct block_device *bdev, u64 old_key, u64 new_key, enum pr_type type, bool abort); int (*pr_clear)(struct block_device *bdev, u64 key); + int (*pr_read_keys)(struct block_device *bdev, + struct pr_keys *keys_info, int keys_info_len); + int (*pr_read_reservation)(struct block_device *bdev, + struct pr_held_reservation *rsv); }; #endif /* LINUX_PR_H */