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Date: Mon, 26 Jan 2009 18:42:18 -0800
From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To: "Linux-iSCSI.org Target Dev"
<linux-iscsi-target-dev@...glegroups.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
linux-scsi <linux-scsi@...r.kernel.org>,
Douglas Gilbert <dgilbert@...erlog.com>,
James Bottomley <James.Bottomley@...senPartnership.com>,
Christoph Hellwig <hch@....de>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Rafiu Fakunle <rafiu@...nfiler.com>,
Ming Zhang <blackmagic02881@...il.com>,
"Ross S. W. Walker" <rswwalker@...il.com>,
Arne Redlich <agr@...erkom-dd.de>,
Hannes Reinecke <hare@...e.de>
Subject: [PATCH] [Target_Core_Mod/PERSISTENT_RESERVATION]: Add Service
Action REPORT_CAPABILITIES
>>From e384da701c0b29c40c8dca9e078cf48d273aa405 Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@...ux-iscsi.org>
Date: Mon, 26 Jan 2009 18:26:21 -0800
Subject: [PATCH] [Target_Core_Mod/PERSISTENT_RESERVATION]: Add Service Action REPORT_CAPABILITIES
This patch adds initial support for PRIN Service Action REPORT_CAPABILITIES support,
and a basic set of PERSISTENT_RESERVATION features for bringup, with the complete
set defined (but mostly disabled or not implemented yet) for long term usage
Target_Core_Mod SPC-3 Compatible Persistent Reservations support.
Using sg_persist from the sg3_utils package, here is what an Target_Core_Mod/IBLOCK
SPC_3 + REPORT_CAPABILITIES response data looks like from LIO-Target v3.0 across
Linux/SCTP:
root@...ntu:~# sg_persist --in --report-capabilities -v /dev/sde
inquiry cdb: 12 00 00 00 24 00
LIO-ORG IBLOCK v3.0
Peripheral device type: disk
Persistent Reservation In cmd: 5e 02 00 00 00 00 00 20 00 00
Report capabilities response:
Compatible Reservation Handling(CRH): 0
Specify Initiator Ports Capable(SIP_C): 0
All Target Ports Capable(ATP_C): 0
Persist Through Power Loss Capable(PTPL_C): 0
Type Mask Valid(TMV): 1
Allow commands: 1
Persist Through Power Loss Active(PTPL_A): 0
Support indicated in Type mask:
Write Exclusive, all registrants: 0
Exclusive Access, registrants only: 0
Write Exclusive, registrants only: 0
Exclusive Access: 1
Write Exclusive: 1
Exclusive Access, all registrants: 0
These should be enough to get up and running for now. In following with
previous Target_Core_Mod/ConfigFS commits, All Target Ports Capable=1 and
Compatible Reservation Handling(CRH)=1 will be added first as PROUT SA:
REGISTER/RELEASE emulation is brought online.
Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
---
drivers/lio-core/target_core_pr.c | 45 ++++++++++++++++++++++++++++++++++++-
1 files changed, 44 insertions(+), 1 deletions(-)
diff --git a/drivers/lio-core/target_core_pr.c b/drivers/lio-core/target_core_pr.c
index ce1a5d3..41fdf89 100644
--- a/drivers/lio-core/target_core_pr.c
+++ b/drivers/lio-core/target_core_pr.c
@@ -787,8 +787,51 @@ static int core_scsi3_pri_read_reservation (se_cmd_t *cmd)
return(0);
}
+/*
+ * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
+ *
+ * See spc4r17 section 6.13.4 Table 165
+ */
static int core_scsi3_pri_report_capabilities (se_cmd_t *cmd)
{
+ se_device_t *se_dev = SE_DEV(cmd);
+ se_subsystem_dev_t *su_dev = SU_DEV(se_dev);
+ t10_pr_registration_t *pr_reg;
+ unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
+ u16 add_len = 8; /* Hardcoded to 8. */
+
+ buf[0] = ((add_len << 8) & 0xff);
+ buf[1] = (add_len & 0xff);
+ /*
+ * FIXME: Leave these features disabled for now..
+ */
+// buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
+// buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
+// buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
+// buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss Capable bit */
+ /*
+ * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
+ * set the TMV: Task Mask Valid bit.
+ */
+ buf[3] |= 0x80;
+ /*
+ * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
+ */
+ buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
+ /*
+ * PTPL_A: Persistence across Target Power Loss Active bit
+ */
+// buf[3] |= 0x01;
+ /*
+ * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
+ */
+// buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
+// buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
+// buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
+ buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
+ buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
+// buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
+
return(0);
}
@@ -804,9 +847,9 @@ static int core_scsi3_emulate_pr_in (se_cmd_t *cmd, unsigned char *cdb)
return(core_scsi3_pri_read_keys(cmd));
case PRI_READ_RESERVATION:
return(core_scsi3_pri_read_reservation(cmd));
-#if 0
case PRI_REPORT_CAPABILITIES:
return(core_scsi3_pri_report_capabilities(cmd));
+#if 0
case PRI_READ_FULL_STATUS:
return(core_scsi3_pri_read_full_status(cmd));
#endif
--
1.5.4.1
--
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