Re: [PATCH] persistent reservation support

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I'll be testing over the next few days and will advise of any success/failures.

Many thanks
Mark

On Mon, Oct 26, 2009 at 12:16 AM, FUJITA Tomonori
<fujita.tomonori@xxxxxxxxxxxxx> wrote:
> 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(&reg->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(&reg->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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