This is the initial try to support persistent reservation
I finished only READ_KEYS, READ_RESERVATION, REPORT_CAPABILITIES, and
REGISTER, RESERVE, RELEASE (and they are not complete).
So I guess that this enables you to only play sg_persist and see if
commands are rejected properly. But I'd really appreciate any input
(comments, test results, patches, etc). As I wrote before, I'd like to
add persistent reservation support and release 1.0.0 this year.
=
From: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
Date: Sun, 25 Oct 2009 22:03:41 +0900
Subject: [PATCH] persistent reservation support
Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
---
usr/sbc.c | 38 +++---
usr/scc.c | 2 +-
usr/scsi.c | 40 +++++
usr/scsi.h | 31 ++++
usr/smc.c | 2 +-
usr/spc.c | 488 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
usr/spc.h | 8 +-
usr/ssc.c | 2 +-
usr/target.c | 10 ++
usr/tgtd.h | 21 +++
10 files changed, 611 insertions(+), 31 deletions(-)
diff --git a/usr/sbc.c b/usr/sbc.c
index 710165d..f443508 100644
--- a/usr/sbc.c
+++ b/usr/sbc.c
@@ -284,9 +284,9 @@ static struct device_type_template sbc_template = {
{spc_illegal_op,},
{spc_illegal_op,},
- {sbc_rw,},
+ {sbc_rw, NULL, PR_EA_FA|PR_EA_FN},
{spc_illegal_op,},
- {sbc_rw,},
+ {sbc_rw, NULL, PR_WE_FA|PR_EA_FA|PR_WE_FN|PR_EA_FN},
{spc_illegal_op,},
{spc_illegal_op,},
{spc_illegal_op,},
@@ -299,14 +299,14 @@ static struct device_type_template sbc_template = {
{spc_inquiry,},
{spc_illegal_op,},
{spc_illegal_op,},
- {sbc_mode_select},
+ {sbc_mode_select, NULL, PR_WE_FA|PR_EA_FA|PR_WE_FN|PR_EA_FN},
{sbc_reserve,},
{sbc_release,},
{spc_illegal_op,},
{spc_illegal_op,},
- {spc_mode_sense,},
- {spc_start_stop,},
+ {spc_mode_sense, NULL, PR_WE_FA|PR_EA_FA|PR_WE_FN|PR_EA_FN},
+ {spc_start_stop, NULL, PR_SPECIAL},
{spc_illegal_op,},
{spc_illegal_op,},
{spc_illegal_op,},
@@ -322,14 +322,14 @@ static struct device_type_template sbc_template = {
{spc_illegal_op,},
{spc_illegal_op,},
- {sbc_rw},
+ {sbc_rw, NULL, PR_EA_FA|PR_EA_FN},
{spc_illegal_op,},
- {sbc_rw},
+ {sbc_rw, NULL, PR_WE_FA|PR_EA_FA|PR_WE_FN|PR_EA_FN},
{spc_illegal_op,},
{spc_illegal_op,},
{spc_illegal_op,},
{spc_illegal_op,},
- {sbc_verify,},
+ {sbc_verify, NULL, PR_EA_FA|PR_EA_FN},
/* 0x30 */
{spc_illegal_op,},
@@ -337,7 +337,7 @@ static struct device_type_template sbc_template = {
{spc_illegal_op,},
{spc_illegal_op,},
{spc_illegal_op,},
- {sbc_sync_cache,},
+ {sbc_sync_cache, NULL, PR_WE_FA|PR_EA_FA|PR_WE_FN|PR_EA_FN},
{spc_illegal_op,},
{spc_illegal_op,},
@@ -358,18 +358,18 @@ static struct device_type_template sbc_template = {
{spc_illegal_op,},
{spc_illegal_op,},
{spc_illegal_op,},
- {sbc_mode_select,},
+ {sbc_mode_select, NULL, PR_WE_FA|PR_EA_FA|PR_WE_FN|PR_EA_FN},
{spc_illegal_op,},
{spc_illegal_op,},
{spc_illegal_op,},
{spc_illegal_op,},
- {spc_mode_sense,},
- {spc_illegal_op,},
- {spc_illegal_op,},
+ {spc_mode_sense, NULL, PR_WE_FA|PR_EA_FA|PR_WE_FN|PR_EA_FN},
{spc_illegal_op,},
{spc_illegal_op,},
{spc_illegal_op,},
+ {spc_service_action, persistent_reserve_in_actions,},
+ {spc_service_action, persistent_reserve_out_actions,},
[0x60 ... 0x7f] = {spc_illegal_op,},
@@ -383,9 +383,9 @@ static struct device_type_template sbc_template = {
{spc_illegal_op,},
{spc_illegal_op,},
- {sbc_rw,},
+ {sbc_rw, NULL, PR_EA_FA|PR_EA_FN},
{spc_illegal_op,},
- {sbc_rw,},
+ {sbc_rw, NULL, PR_WE_FA|PR_EA_FA|PR_WE_FN|PR_EA_FN},
{spc_illegal_op,},
{spc_illegal_op,},
{spc_illegal_op,},
@@ -394,7 +394,7 @@ static struct device_type_template sbc_template = {
/* 0x90 */
{spc_illegal_op,},
- {sbc_sync_cache,},
+ {sbc_sync_cache, NULL, PR_WE_FA|PR_EA_FA|PR_WE_FN|PR_EA_FN},
{spc_illegal_op,},
{spc_illegal_op,},
{spc_illegal_op,},
@@ -415,15 +415,15 @@ static struct device_type_template sbc_template = {
{spc_report_luns,},
{spc_illegal_op,},
{spc_illegal_op,},
- {spc_maint_in, maint_in_service_actions,},
+ {spc_service_action, maint_in_service_actions,},
{spc_illegal_op,},
{spc_illegal_op,},
{spc_illegal_op,},
{spc_illegal_op,},
- {sbc_rw,},
+ {sbc_rw, NULL, PR_EA_FA|PR_EA_FN},
{spc_illegal_op,},
- {sbc_rw,},
+ {sbc_rw, NULL, PR_WE_FA|PR_EA_FA|PR_WE_FN|PR_EA_FN},
{spc_illegal_op,},
{spc_illegal_op,},
{spc_illegal_op,},
diff --git a/usr/scc.c b/usr/scc.c
index eed48a0..27bc07b 100644
--- a/usr/scc.c
+++ b/usr/scc.c
@@ -143,7 +143,7 @@ static struct device_type_template scc_template = {
{spc_report_luns,},
{spc_illegal_op,},
{spc_illegal_op,},
- {spc_maint_in, maint_in_service_actions,},
+ {spc_service_action, maint_in_service_actions,},
{spc_illegal_op,},
{spc_illegal_op,},
{spc_illegal_op,},
diff --git a/usr/scsi.c b/usr/scsi.c
index daf4aef..61a2d7e 100644
--- a/usr/scsi.c
+++ b/usr/scsi.c
@@ -183,6 +183,43 @@ uint32_t scsi_rw_count(uint8_t *scb)
return cnt;
}
+static int scsi_pr_access_check(struct scsi_cmd *cmd)
+{
+ unsigned char op = cmd->scb[0];
+ uint8_t bits;
+ uint8_t pr_type;
+ struct registration *reg;
+ int conflict = 0;
+
+ if (!cmd->dev->pr_holder)
+ return 0;
+
+ reg = lookup_registration_by_nexus(cmd->dev, cmd->cmd_itn_id);
+
+ if (reg == cmd->dev->pr_holder)
+ return 0;
+
+ pr_type = cmd->dev->pr_holder->pr_type;
+ bits = cmd->dev->dev_type_template.ops[op].pr_conflict_bits;
+
+ if (pr_type == PR_TYPE_WRITE_EXCLUSIVE ||
+ pr_type == PR_TYPE_EXCLUSIVE_ACCESS)
+ conflict = bits & (PR_WE_FA|PR_EA_FA);
+ else {
+ if (reg)
+ conflict = bits & PR_RR_FR;
+ else {
+ if (pr_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
+ pr_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG)
+ conflict = bits & PR_WE_FN;
+ else
+ conflict = bits & PR_EA_FN;
+ }
+ }
+
+ return conflict;
+}
+
int scsi_cmd_perform(int host_no, struct scsi_cmd *cmd)
{
int ret;
@@ -227,6 +264,9 @@ int scsi_cmd_perform(int host_no, struct scsi_cmd *cmd)
return SAM_STAT_CHECK_CONDITION;
}
+ if (scsi_pr_access_check(cmd))
+ return SAM_STAT_RESERVATION_CONFLICT;
+
return cmd->dev->dev_type_template.ops[op].cmd_perform(host_no, cmd);
}
diff --git a/usr/scsi.h b/usr/scsi.h
index 84fadff..9fd78fd 100644
--- a/usr/scsi.h
+++ b/usr/scsi.h
@@ -201,12 +201,14 @@
#define ASC_INVALID_FIELD_IN_CDB 0x2400
#define ASC_LUN_NOT_SUPPORTED 0x2500
#define ASC_INVALID_FIELD_IN_PARMS 0x2600
+#define ASC_INVALID_RELEASE_OF_PERSISTENT_RESERVATION 0x2604
#define ASC_INCOMPATIBLE_FORMAT 0x3005
#define ASC_SAVING_PARMS_UNSUP 0x3900
#define ASC_MEDIUM_DEST_FULL 0x3b0d
#define ASC_MEDIUM_SRC_EMPTY 0x3b0e
#define ASC_POSITION_PAST_BOM 0x3b0c
#define ASC_MEDIUM_REMOVAL_PREVENTED 0x5302
+#define ASC_INSUFFICENT_REGISTRATION_RESOURCES 0x5504
#define ASC_BAD_MICROCODE_DETECTED 0x8283
/* Key 6: Unit Attention */
@@ -214,6 +216,7 @@
#define ASC_POWERON_RESET 0x2900
#define ASC_I_T_NEXUS_LOSS_OCCURRED 0x2907
#define ASC_MODE_PARAMETERS_CHANGED 0x2a01
+#define ASC_RESERVATIONS_RELEASED 0x2a04
#define ASC_INSUFFICIENT_TIME_FOR_OPERATION 0x2e00
#define ASC_COMMANDS_CLEARED_BY_ANOTHOR_INI 0x2f00
#define ASC_MICROCODE_DOWNLOADED 0x3f01
@@ -225,4 +228,32 @@
#define ASC_WRITE_PROTECT 0x2700
#define ASC_MEDIUM_OVERWRITE_ATTEMPTED 0x300c
+
+/* PERSISTENT_RESERVE_IN service action codes */
+#define PR_IN_READ_KEYS 0x00
+#define PR_IN_READ_RESERVATION 0x01
+#define PR_IN_REPORT_CAPABILITIES 0x02
+#define PR_IN_READ_FULL_STATUS 0x03
+
+/* PERSISTENT_RESERVE_OUT service action codes */
+#define PR_OUT_REGISTER 0x00
+#define PR_OUT_RESERVE 0x01
+#define PR_OUT_RELEASE 0x02
+#define PR_OUT_CLEAR 0x03
+#define PR_OUT_PREEMPT 0x04
+#define PR_OUT_PREEMPT_AND_ABORT 0x05
+#define PR_OUT_REGISTER_AND_IGNORE_EXISTING_KEY 0x06
+#define PR_OUT_REGISTER_AND_MOVE 0x07
+
+/* Persistent Reservation scope */
+#define PR_LU_SCOPE 0x00
+
+/* Persistent Reservation Type Mask format */
+#define PR_TYPE_WRITE_EXCLUSIVE 0x01
+#define PR_TYPE_EXCLUSIVE_ACCESS 0x03
+#define PR_TYPE_WRITE_EXCLUSIVE_REGONLY 0x05
+#define PR_TYPE_EXCLUSIVE_ACCESS_REGONLY 0x06
+#define PR_TYPE_WRITE_EXCLUSIVE_ALLREG 0x07
+#define PR_TYPE_EXCLUSIVE_ACCESS_ALLREG 0x08
+
#endif
diff --git a/usr/smc.c b/usr/smc.c
index ab36e9c..6430882 100644
--- a/usr/smc.c
+++ b/usr/smc.c
@@ -861,7 +861,7 @@ struct device_type_template smc_template = {
{spc_report_luns,},
{spc_illegal_op,},
{spc_illegal_op,},
- {spc_maint_in, maint_in_service_actions,},
+ {spc_service_action, maint_in_service_actions,},
{spc_illegal_op,},
{smc_move_medium,},
{spc_illegal_op,},
diff --git a/usr/spc.c b/usr/spc.c
index 1a75766..96ac8db 100644
--- a/usr/spc.c
+++ b/usr/spc.c
@@ -720,7 +720,7 @@ struct service_action maint_in_service_actions[] = {
{0, NULL}
};
-struct service_action *
+static struct service_action *
find_service_action(struct service_action *service_action, uint32_t action)
{
while (service_action->cmd_perform) {
@@ -731,16 +731,20 @@ find_service_action(struct service_action *service_action, uint32_t action)
return NULL;
}
-/**
- * This functions emulates the various commands using the 0xa3 cdb opcode
+/*
+ * This is useful for the various commands using the SERVICE ACTION
+ * format.
*/
-int spc_maint_in(int host_no, struct scsi_cmd *cmd)
+int spc_service_action(int host_no, struct scsi_cmd *cmd)
{
uint8_t action;
- struct service_action *service_action;
+ unsigned char op = cmd->scb[0];
+ struct service_action *service_action, *actions;
action = cmd->scb[1] & 0x1f;
- service_action = find_service_action(maint_in_service_actions, action);
+ actions = cmd->dev->dev_type_template.ops[op].service_actions;
+
+ service_action = find_service_action(actions, action);
if (!service_action) {
scsi_set_in_resid_by_actual(cmd, 0);
@@ -752,6 +756,477 @@ int spc_maint_in(int host_no, struct scsi_cmd *cmd)
return service_action->cmd_perform(host_no, cmd);
}
+static int spc_pr_read_keys(int host_no, struct scsi_cmd *cmd)
+{
+ uint16_t asc = ASC_INVALID_FIELD_IN_CDB;
+ uint8_t key = ILLEGAL_REQUEST;
+ struct registration *reg;
+ uint16_t len;
+ uint32_t keys;
+ uint8_t *buf;
+ int off;
+
+ len = get_unaligned_be16(cmd->scb + 7);
+ if (len < 8)
+ goto sense;
+
+ if (scsi_get_in_length(cmd) < len)
+ goto sense;
+
+ buf = scsi_get_in_buffer(cmd);
+ memset(buf, 0, len);
+
+ len &= ~(8 - 1);
+ keys = 0;
+ off = 8;
+
+ put_unaligned_be32(cmd->dev->prgeneration, &buf[0]);
+
+ list_for_each_entry(reg, &cmd->dev->registration_list,
+ registration_siblings) {
+ if (!len)
+ continue;
+ put_unaligned_be64(reg->key, &buf[off]);
+
+ len -= 8;
+ keys++;
+ }
+
+ put_unaligned_be32(keys * 8, &buf[4]);
+
+ scsi_set_in_resid_by_actual(cmd, keys * 8 + 8);
+
+ return SAM_STAT_GOOD;
+sense:
+ scsi_set_in_resid_by_actual(cmd, 0);
+ sense_data_build(cmd, key, asc);
+ return SAM_STAT_CHECK_CONDITION;
+}
+
+static int spc_pr_read_reservation(int host_no, struct scsi_cmd *cmd)
+{
+ uint16_t asc = ASC_INVALID_FIELD_IN_CDB;
+ uint8_t key = ILLEGAL_REQUEST;
+ struct registration *reg;
+ uint16_t len;
+ uint8_t *buf;
+ uint64_t res_key;
+
+ reg = cmd->dev->pr_holder;
+
+ if (reg)
+ len = 24;
+ else
+ len = 8;
+
+ if (get_unaligned_be16(cmd->scb + 7) < len)
+ goto sense;
+
+ if (scsi_get_in_length(cmd) < len)
+ goto sense;
+
+ buf = scsi_get_in_buffer(cmd);
+ memset(buf, 0, len);
+
+ put_unaligned_be32(cmd->dev->prgeneration, &buf[0]);
+
+ if (reg) {
+ put_unaligned_be32(16, &buf[4]);
+
+ if (reg->pr_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
+ reg->pr_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)
+ res_key = 0;
+ else
+ res_key = reg->key;
+
+ put_unaligned_be32(res_key, &buf[8]);
+ buf[21] = ((reg->pr_scope << 4) & 0xf0) | (reg->pr_type & 0x0f);
+ } else
+ put_unaligned_be32(0, &buf[4]);
+
+ scsi_set_in_resid_by_actual(cmd, len);
+
+ return SAM_STAT_GOOD;
+sense:
+ scsi_set_in_resid_by_actual(cmd, 0);
+ sense_data_build(cmd, key, asc);
+ return SAM_STAT_CHECK_CONDITION;
+}
+
+static int spc_pr_report_capabilities(int host_no, struct scsi_cmd *cmd)
+{
+ uint16_t asc = ASC_INVALID_FIELD_IN_CDB;
+ uint8_t key = ILLEGAL_REQUEST;
+ uint8_t *buf;
+ uint16_t len;
+
+ len = get_unaligned_be16(cmd->scb + 7);
+ if (len < 8)
+ goto sense;
+
+ if (scsi_get_in_length(cmd) < len)
+ goto sense;
+
+ buf = scsi_get_in_buffer(cmd);
+
+ len = 8;
+
+ memset(buf, 0, len);
+
+ put_unaligned_be16(len, &buf[0]);
+
+ /* we don't set any capability for now */
+
+ /* Persistent Reservation Type Mask format */
+ 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 SAM_STAT_GOOD;
+sense:
+ scsi_set_in_resid_by_actual(cmd, 0);
+ sense_data_build(cmd, key, asc);
+ return SAM_STAT_CHECK_CONDITION;
+}
+
+static int spc_pr_read_full_status(int host_no, struct scsi_cmd *cmd)
+{
+ uint16_t asc = ASC_INVALID_FIELD_IN_CDB;
+ uint8_t key = ILLEGAL_REQUEST;
+ struct registration *reg;
+ uint16_t len;
+ uint32_t keys;
+ uint8_t *buf;
+ int off;
+
+ len = get_unaligned_be16(cmd->scb + 7);
+ if (len < 8)
+ goto sense;
+ if (scsi_get_in_length(cmd) < len)
+ goto sense;
+
+ buf = scsi_get_in_buffer(cmd);
+ memset(buf, 0, len);
+
+ put_unaligned_be32(cmd->dev->prgeneration, &buf[0]);
+
+ len &= ~(24 - 1);
+ off = 8;
+ keys = 0;
+
+ list_for_each_entry(reg, &cmd->dev->registration_list,
+ registration_siblings) {
+
+ if (!len)
+ continue;
+
+ put_unaligned_be64(reg->key, &buf[off + 0]);
+
+ /* TODO */
+
+ put_unaligned_be32(0, &buf[off + 20]);
+
+ keys++;
+ len -= 24;
+ off += 24;
+ }
+
+ put_unaligned_be32(keys * 24, &buf[4]);
+
+ scsi_set_in_resid_by_actual(cmd, keys * 24 + 8);
+
+ return SAM_STAT_GOOD;
+sense:
+ scsi_set_in_resid_by_actual(cmd, 0);
+ sense_data_build(cmd, key, asc);
+ return SAM_STAT_CHECK_CONDITION;
+}
+
+struct service_action persistent_reserve_in_actions[] = {
+ {PR_IN_READ_KEYS, spc_pr_read_keys},
+ {PR_IN_READ_RESERVATION, spc_pr_read_reservation},
+ {PR_IN_REPORT_CAPABILITIES, spc_pr_report_capabilities},
+ {PR_IN_READ_FULL_STATUS, spc_pr_read_full_status},
+ {0, NULL},
+};
+
+struct registration *lookup_registration_by_nexus(struct scsi_lu *lu,
+ uint64_t nexus_id)
+{
+ struct registration *reg;
+
+ list_for_each_entry(reg, &lu->registration_list, registration_siblings) {
+ if (reg->nexus_id == nexus_id)
+ return reg;
+ }
+
+ return NULL;
+}
+
+static int check_pr_out_basic_parameter(struct scsi_cmd *cmd)
+{
+ uint8_t spec_i_pt, all_tg_pt, aptpl;
+ uint8_t *buf;
+ uint16_t len = 24;
+
+ if (get_unaligned_be16(cmd->scb + 7) < len)
+ return 1;
+
+ if (scsi_get_out_length(cmd) < len)
+ return 1;
+
+ buf = scsi_get_out_buffer(cmd);
+
+ spec_i_pt = buf[20] & (1U << 3);
+ all_tg_pt = buf[20] & (1U << 2);
+ aptpl = buf[20] & (1U << 0);
+
+ if (spec_i_pt | all_tg_pt | aptpl) {
+ /*
+ * for now, we say that we don't support these bits
+ * via REPORT CAPABILITIES.
+ */
+ return 1;
+ }
+
+ return 0;
+}
+
+static int spc_pr_register(int host_no, struct scsi_cmd *cmd)
+{
+ uint8_t force, key = ILLEGAL_REQUEST;
+ uint16_t asc = ASC_INVALID_FIELD_IN_CDB;
+ uint64_t res_key, sa_res_key;
+ int ret;
+ uint8_t *buf;
+ struct registration *reg;
+
+ force = ((cmd->scb[1] & 0x1f) == PR_OUT_REGISTER_AND_IGNORE_EXISTING_KEY);
+
+ ret = check_pr_out_basic_parameter(cmd);
+ if (ret)
+ goto sense;
+
+ buf = scsi_get_out_buffer(cmd);
+
+ res_key = get_unaligned_be64(buf);
+ sa_res_key = get_unaligned_be64(buf + 8);
+
+ reg = lookup_registration_by_nexus(cmd->dev, cmd->cmd_itn_id);
+ if (reg) {
+ if (force || reg->key == res_key) {
+ if (sa_res_key)
+ reg->key = sa_res_key;
+ else {
+ /* unregister */
+ list_del(®->registration_siblings);
+ free(reg);
+ }
+ } else
+ return SAM_STAT_RESERVATION_CONFLICT;
+ } else {
+ if (force || !res_key) {
+ if (sa_res_key) {
+ reg = zalloc(sizeof(*reg));
+ if (!reg) {
+ key = ILLEGAL_REQUEST;
+ asc = ASC_INSUFFICENT_REGISTRATION_RESOURCES;
+ goto sense;
+ }
+ reg->key = sa_res_key;
+ reg->nexus_id = cmd->cmd_itn_id;
+ list_add_tail(®->registration_siblings,
+ &cmd->dev->registration_list);
+ } else
+ ; /* do nothing */
+ } else
+ return SAM_STAT_RESERVATION_CONFLICT;
+ }
+
+ cmd->dev->prgeneration++;
+
+ return SAM_STAT_GOOD;
+sense:
+ scsi_set_in_resid_by_actual(cmd, 0);
+ sense_data_build(cmd, key, asc);
+ return SAM_STAT_CHECK_CONDITION;
+}
+
+static int spc_pr_reserve(int host_no, struct scsi_cmd *cmd)
+{
+ uint16_t asc = ASC_INVALID_FIELD_IN_CDB;
+ uint8_t key = ILLEGAL_REQUEST;
+ uint8_t pr_scope, pr_type;
+ uint8_t *buf;
+ uint64_t res_key, sa_res_key;
+ int ret;
+ struct registration *reg, *holder;
+
+ ret = check_pr_out_basic_parameter(cmd);
+ if (ret)
+ goto sense;
+
+ pr_scope = (cmd->scb[2] & 0xf0) >> 4;
+ pr_type = cmd->scb[2] & 0x0f;
+
+ buf = scsi_get_out_buffer(cmd);
+
+ res_key = get_unaligned_be64(buf);
+ sa_res_key = get_unaligned_be64(buf + 8);
+
+ switch (pr_type) {
+ case PR_TYPE_WRITE_EXCLUSIVE:
+ case PR_TYPE_EXCLUSIVE_ACCESS:
+ case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
+ case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
+ case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
+ case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
+ break;
+ default:
+ goto sense;
+ }
+
+ if (pr_scope != PR_LU_SCOPE)
+ goto sense;
+
+ reg = lookup_registration_by_nexus(cmd->dev, cmd->cmd_itn_id);
+ if (!reg)
+ return SAM_STAT_RESERVATION_CONFLICT;
+
+ holder = cmd->dev->pr_holder;
+ if (holder) {
+ if (holder != reg)
+ return SAM_STAT_RESERVATION_CONFLICT;
+
+ if (holder->pr_type != pr_type ||
+ holder->pr_scope != pr_scope)
+ return SAM_STAT_RESERVATION_CONFLICT;
+
+ return SAM_STAT_GOOD;
+ }
+
+ reg->pr_scope = pr_scope;
+ reg->pr_type = pr_type;
+ cmd->dev->pr_holder = reg;
+
+ return SAM_STAT_GOOD;
+sense:
+ scsi_set_in_resid_by_actual(cmd, 0);
+ sense_data_build(cmd, key, asc);
+ return SAM_STAT_CHECK_CONDITION;
+}
+
+static int spc_pr_release(int host_no, struct scsi_cmd *cmd)
+{
+ uint16_t asc = ASC_INVALID_FIELD_IN_CDB;
+ uint8_t key = ILLEGAL_REQUEST;
+ uint8_t pr_scope, pr_type;
+ uint8_t *buf;
+ uint64_t res_key, sa_res_key;
+ int ret;
+ struct registration *reg, *holder, *sibling;
+
+ ret = check_pr_out_basic_parameter(cmd);
+ if (ret)
+ goto sense;
+
+ pr_scope = (cmd->scb[2] & 0xf0) >> 4;
+ pr_type = cmd->scb[2] & 0x0f;
+
+ buf = scsi_get_out_buffer(cmd);
+
+ res_key = get_unaligned_be64(buf);
+ sa_res_key = get_unaligned_be64(buf + 8);
+
+ reg = lookup_registration_by_nexus(cmd->dev, cmd->cmd_itn_id);
+ if (!reg)
+ return SAM_STAT_RESERVATION_CONFLICT;
+
+ holder = cmd->dev->pr_holder;
+ if (!holder)
+ return SAM_STAT_GOOD;
+
+ if (holder != reg)
+ return SAM_STAT_GOOD;
+
+ if (res_key != reg->key)
+ return SAM_STAT_RESERVATION_CONFLICT;
+
+ if (reg->pr_scope != pr_scope || reg->pr_type != pr_type) {
+ asc = ASC_INVALID_RELEASE_OF_PERSISTENT_RESERVATION;
+ goto sense;
+ }
+
+ cmd->dev->pr_holder = NULL;
+ reg->pr_scope = 0;
+ reg->pr_type = 0;
+
+ switch (pr_type) {
+ case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
+ case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
+ case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
+ case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
+ return SAM_STAT_GOOD;
+ default:
+ ;
+ }
+
+ list_for_each_entry(sibling, &cmd->dev->registration_list,
+ registration_siblings) {
+ /* we don't send myself */
+ if (sibling == reg)
+ continue;
+
+ ua_sense_add_other_it_nexus(sibling->nexus_id,
+ cmd->dev, ASC_RESERVATIONS_RELEASED);
+ }
+
+ return SAM_STAT_GOOD;
+sense:
+ scsi_set_in_resid_by_actual(cmd, 0);
+ sense_data_build(cmd, key, asc);
+ return SAM_STAT_CHECK_CONDITION;
+}
+
+#if 0
+static int spc_pr_clear(int host_no, struct scsi_cmd *cmd)
+{
+ return SAM_STAT_GOOD;
+}
+
+static int spc_pr_preempt(int host_no, struct scsi_cmd *cmd)
+{
+ return SAM_STAT_GOOD;
+}
+
+static int spc_pr_preempt_and_abort(int host_no, struct scsi_cmd *cmd)
+{
+ return SAM_STAT_GOOD;
+}
+
+static int spc_pr_register_and_move(int host_no, struct scsi_cmd *cmd)
+{
+ return SAM_STAT_GOOD;
+}
+#endif
+
+struct service_action persistent_reserve_out_actions[] = {
+ {PR_OUT_REGISTER, spc_pr_register},
+ {PR_OUT_RESERVE, spc_pr_reserve},
+ {PR_OUT_RELEASE, spc_pr_release},
+#if 0
+ {PR_OUT_CLEAR, spc_pr_clear},
+ {PR_OUT_PREEMPT, spc_pr_preempt},
+ {PR_OUT_PREEMPT_AND_ABORT, spc_pr_preempt_and_abort},
+ {PR_OUT_REGISTER_AND_IGNORE_EXISTING_KEY, spc_pr_register},
+ {PR_OUT_REGISTER_AND_MOVE, spc_pr_register_and_move},
+#endif
+ {0, NULL},
+};
+
int spc_request_sense(int host_no, struct scsi_cmd *cmd)
{
uint8_t *data;
@@ -1065,4 +1540,3 @@ void spc_lu_exit(struct scsi_lu *lu)
if (lu->mode_pgs[i])
free(lu->mode_pgs[i]);
}
-
diff --git a/usr/spc.h b/usr/spc.h
index cfc9cf3..a731b94 100644
--- a/usr/spc.h
+++ b/usr/spc.h
@@ -1,8 +1,10 @@
#ifndef __SPC_H
#define __SPC_H
-extern struct service_action maint_in_service_actions[];
-extern int spc_maint_in(int host_no, struct scsi_cmd *cmd);
+extern struct service_action maint_in_service_actions[],
+ persistent_reserve_in_actions[], persistent_reserve_out_actions[];
+
+extern int spc_service_action(int host_no, struct scsi_cmd *cmd);
extern int spc_inquiry(int host_no, struct scsi_cmd *cmd);
extern int spc_report_luns(int host_no, struct scsi_cmd *cmd);
extern int spc_start_stop(int host_no, struct scsi_cmd *cmd);
@@ -27,4 +29,6 @@ extern struct vpd *alloc_vpd(uint16_t size);
extern int spc_lu_online(struct scsi_lu *lu);
extern int spc_lu_offline(struct scsi_lu *lu);
+struct registration *lookup_registration_by_nexus(struct scsi_lu *lu,
+ uint64_t nexus_id);
#endif
diff --git a/usr/ssc.c b/usr/ssc.c
index 834ec16..84fa317 100644
--- a/usr/ssc.c
+++ b/usr/ssc.c
@@ -310,7 +310,7 @@ static struct device_type_template ssc_template = {
{spc_report_luns,},
{spc_illegal_op,},
{spc_illegal_op,},
- {spc_maint_in, maint_in_service_actions,},
+ {spc_service_action, maint_in_service_actions,},
{spc_illegal_op,},
{spc_illegal_op,},
{spc_illegal_op,},
diff --git a/usr/target.c b/usr/target.c
index 14e3632..3f4f05c 100644
--- a/usr/target.c
+++ b/usr/target.c
@@ -490,6 +490,9 @@ int tgt_device_create(int tid, int dev_type, uint64_t lun, char *params,
lu->tgt = target;
lu->lun = lun;
tgt_cmd_queue_init(&lu->cmd_queue);
+ INIT_LIST_HEAD(&lu->registration_list);
+ lu->prgeneration = 0;
+ lu->pr_holder = NULL;
if (lu->dev_type_template.lu_init) {
ret = lu->dev_type_template.lu_init(lu);
@@ -567,6 +570,7 @@ int tgt_device_destroy(int tid, uint64_t lun, int force)
struct scsi_lu *lu;
struct it_nexus *itn;
struct it_nexus_lu_info *itn_lu, *next;
+ struct registration *reg, *reg_next;
int ret;
dprintf("%u %" PRIu64 "\n", tid, lun);
@@ -606,6 +610,12 @@ int tgt_device_destroy(int tid, uint64_t lun, int force)
}
list_del(&lu->device_siblings);
+
+ list_for_each_entry_safe(reg, reg_next, &lu->registration_list,
+ registration_siblings) {
+ free(reg);
+ }
+
free(lu);
list_for_each_entry(itn, &target->it_nexus_list, nexus_siblings) {
diff --git a/usr/tgtd.h b/usr/tgtd.h
index febaed7..96c744f 100644
--- a/usr/tgtd.h
+++ b/usr/tgtd.h
@@ -90,8 +90,16 @@ struct service_action {
struct device_type_operations {
int (*cmd_perform)(int host_no, struct scsi_cmd *cmd);
struct service_action *service_actions;
+ uint8_t pr_conflict_bits;
};
+#define PR_SPECIAL (1U << 5)
+#define PR_WE_FA (1U << 4)
+#define PR_EA_FA (1U << 3)
+#define PR_RR_FR (1U << 2)
+#define PR_WE_FN (1U << 1)
+#define PR_EA_FN (1U << 0)
+
struct device_type_template {
unsigned char type;
@@ -126,6 +134,15 @@ struct mode_pg {
uint8_t mode_data[0]; /* Rest of mode page info */
};
+struct registration {
+ uint64_t key;
+ uint64_t nexus_id;
+ struct list_head registration_siblings;
+
+ uint8_t pr_scope;
+ uint8_t pr_type;
+};
+
struct scsi_lu {
int fd;
uint64_t addr; /* persistent mapped address */
@@ -152,6 +169,10 @@ struct scsi_lu {
struct lu_phy_attr attrs;
+ struct list_head registration_list;
+ uint32_t prgeneration;
+ struct registration *pr_holder;
+
/* A pointer for each modules private use.
* Currently used by ssc, smc and mmc modules.
*/
--
1.5.6.5
--
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