Re: [PATCH] Add an array that describes which opcodes are supported by the RDWR and SHEEPDOG backends.

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On Sat, Oct 12, 2013 at 7:38 AM, Ronnie Sahlberg
<ronniesahlberg@xxxxxxxxx> wrote:
> While RDWR supports all SBC opcodes that TGTD implement SHEEPDOG
> only supports a subset and lacks the following opcodes:
>             WRITE_VERIFY10/12/16 VERIFY10/12/16 PREFETCH10/16
>             WRITE_SAME10/16 UNMAP and ORWRITE
>
> This allows backends to specify which opcodes it is prepared to process
> and which commands should fail with invalid op code
> and allows SHEEPDOG backed LUNs to respond with INVALID_OP_CODE
> correctly.
>
> This is most useful for block devices where we have several different backens
> and where some backends only support a subset of the commands
>
> Signed-off-by: Ronnie Sahlberg <ronniesahlberg@xxxxxxxxx>
> ---
>  usr/bs.c          |    8 ++++++++
>  usr/bs_rdwr.c     |   51 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  usr/bs_sheepdog.c |   38 ++++++++++++++++++++++++++++++++++++++
>  usr/scsi.c        |    6 ++++++
>  usr/tgtd.h        |    1 +
>  5 files changed, 104 insertions(+), 0 deletions(-)
>
> diff --git a/usr/bs.c b/usr/bs.c
> index 636f53b..5299498 100644
> --- a/usr/bs.c
> +++ b/usr/bs.c
> @@ -463,3 +463,11 @@ int bs_thread_cmd_submit(struct scsi_cmd *cmd)
>
>         return 0;
>  }
> +
> +void bs_create_opcode_map(unsigned char *map, unsigned char *opcodes, int num)
> +{
> +       int i;
> +
> +       for (i = 0; i < num; i++)
> +               map[opcodes[i]] = 1;
> +}
> diff --git a/usr/bs_rdwr.c b/usr/bs_rdwr.c
> index 47d2d99..6a88205 100644
> --- a/usr/bs_rdwr.c
> +++ b/usr/bs_rdwr.c
> @@ -412,6 +412,8 @@ static void bs_rdwr_exit(struct scsi_lu *lu)
>         bs_thread_close(info);
>  }
>
> +static char bs_ops_supported[256];
> +
>  static struct backingstore_template rdwr_bst = {
>         .bs_name                = "rdwr",
>         .bs_datasize            = sizeof(struct bs_thread_info),
> @@ -421,9 +423,58 @@ static struct backingstore_template rdwr_bst = {
>         .bs_exit                = bs_rdwr_exit,
>         .bs_cmd_submit          = bs_thread_cmd_submit,
>         .bs_oflags_supported    = O_SYNC | O_DIRECT,
> +       .bs_ops_supported       = bs_ops_supported,
>  };
>
>  __attribute__((constructor)) static void bs_rdwr_constructor(void)
>  {
> +       static char opcodes[] = {
> +               ALLOW_MEDIUM_REMOVAL,
> +               COMPARE_AND_WRITE,
> +               FORMAT_UNIT,
> +               INQUIRY,
> +               MAINT_PROTOCOL_IN,
> +               MODE_SELECT,
> +               MODE_SELECT_10,
> +               MODE_SENSE,
> +               MODE_SENSE_10,
> +               ORWRITE_16,
> +               PERSISTENT_RESERVE_IN,
> +               PERSISTENT_RESERVE_OUT,
> +               PRE_FETCH_10,
> +               PRE_FETCH_16,
> +               READ_10,
> +               READ_12,
> +               READ_16,
> +               READ_6,
> +               READ_CAPACITY,
> +               RELEASE,
> +               REPORT_LUNS,
> +               REQUEST_SENSE,
> +               RESERVE,
> +               SEND_DIAGNOSTIC,
> +               SERVICE_ACTION_IN,
> +               START_STOP,
> +               SYNCHRONIZE_CACHE,
> +               SYNCHRONIZE_CACHE_16,
> +               TEST_UNIT_READY,
> +               UNMAP,
> +               VERIFY_10,
> +               VERIFY_12,
> +               VERIFY_16,
> +               WRITE_10,
> +               WRITE_12,
> +               WRITE_16,
> +               WRITE_6,
> +               WRITE_SAME,
> +               WRITE_SAME_16,
> +               WRITE_VERIFY,
> +               WRITE_VERIFY_12,
> +               WRITE_VERIFY_16
> +       };
> +
> +       bs_create_opcode_map(bs_ops_supported, &opcodes[0],
> +               sizeof(opcodes) / sizeof(opcodes[0]));
> +
>         register_backingstore_template(&rdwr_bst);
>  }
> diff --git a/usr/bs_sheepdog.c b/usr/bs_sheepdog.c
> index 4b5a951..3099b58 100644
> --- a/usr/bs_sheepdog.c
> +++ b/usr/bs_sheepdog.c
> @@ -1017,6 +1017,8 @@ static void bs_sheepdog_exit(struct scsi_lu *lu)
>         }
>  }
>
> +static char bs_ops_supported[256];
> +
>  static struct backingstore_template sheepdog_bst = {
>         .bs_name                = "sheepdog",
>         .bs_datasize            =
> @@ -1026,9 +1028,45 @@ static struct backingstore_template sheepdog_bst = {
>         .bs_init                = bs_sheepdog_init,
>         .bs_exit                = bs_sheepdog_exit,
>         .bs_cmd_submit          = bs_thread_cmd_submit,
> +       .bs_ops_supported       = bs_ops_supported,
>  };
>
>  __attribute__((constructor)) static void __constructor(void)
>  {
> +       static char opcodes[] = {
> +               ALLOW_MEDIUM_REMOVAL,
> +               FORMAT_UNIT,
> +               INQUIRY,
> +               MAINT_PROTOCOL_IN,
> +               MODE_SELECT,
> +               MODE_SELECT_10,
> +               MODE_SENSE,
> +               MODE_SENSE_10,
> +               PERSISTENT_RESERVE_IN,
> +               PERSISTENT_RESERVE_OUT,
> +               READ_10,
> +               READ_12,
> +               READ_16,
> +               READ_6,
> +               READ_CAPACITY,
> +               RELEASE,
> +               REPORT_LUNS,
> +               REQUEST_SENSE,
> +               RESERVE,
> +               SEND_DIAGNOSTIC,
> +               SERVICE_ACTION_IN,
> +               START_STOP,
> +               SYNCHRONIZE_CACHE,
> +               SYNCHRONIZE_CACHE_16,
> +               TEST_UNIT_READY,
> +               WRITE_10,
> +               WRITE_12,
> +               WRITE_16,
> +               WRITE_6
> +       };
> +
> +       bs_create_opcode_map(bs_ops_supported, &opcodes[0],
> +               sizeof(opcodes) / sizeof(opcodes[0]));
> +
>         register_backingstore_template(&sheepdog_bst);
>  }
> diff --git a/usr/scsi.c b/usr/scsi.c
> index 2636a5c..bce5ae0 100644
> --- a/usr/scsi.c
> +++ b/usr/scsi.c
> @@ -492,6 +492,12 @@ int scsi_cmd_perform(int host_no, struct scsi_cmd *cmd)
>         if (spc_access_check(cmd))
>                 return SAM_STAT_RESERVATION_CONFLICT;
>
> +       if (cmd->dev->bst->bs_ops_supported
> +       && !cmd->dev->bst->bs_ops_supported[op]) {
> +               sense_data_build(cmd, ILLEGAL_REQUEST, ASC_INVALID_OP_CODE);
> +               return SAM_STAT_CHECK_CONDITION;
> +       }
> +
>         return cmd->dev->dev_type_template.ops[op].cmd_perform(host_no, cmd);
>  }
>
> diff --git a/usr/tgtd.h b/usr/tgtd.h
> index 484e6e9..70f6306 100644
> --- a/usr/tgtd.h
> +++ b/usr/tgtd.h
> @@ -165,6 +165,7 @@ struct backingstore_template {
>         void (*bs_exit)(struct scsi_lu *dev);
>         int (*bs_cmd_submit)(struct scsi_cmd *cmd);
>         int bs_oflags_supported;
> +       const char *bs_ops_supported;
>
>         struct list_head backingstore_siblings;
>  };
> --
> 1.7.3.1
>
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