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tcmu: prep queue_cmd_ring to be used by unmap wq 

In the next patches we will call queue_cmd_ring from the submitting
context and also the completion path. This changes the queue_cmd_ring
return code so in the next patches we can return a sense_reason_t
and also signal if a command was requeued.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Mike Christie 2017-11-28 12:40:37 -06:00 committed by Nicholas Bellinger
parent 3e60913579
commit 6fd0ce7972
1 changed files with 27 additions and 15 deletions
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42
drivers/target/target_core_user.c
View File

@ -776,8 +776,16 @@ static int tcmu_setup_cmd_timer(struct tcmu_cmd *tcmu_cmd)
return 0;
}
static sense_reason_t
tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
/**
* queue_cmd_ring - queue cmd to ring or internally
* @tcmu_cmd: cmd to queue
* @scsi_err: TCM error code if failure (-1) returned.
*
* Returns:
* -1 we cannot queue internally or to the ring.
* 0 success
*/
static sense_reason_t queue_cmd_ring(struct tcmu_cmd *tcmu_cmd, int *scsi_err)
{
struct tcmu_dev *udev = tcmu_cmd->tcmu_dev;
struct se_cmd *se_cmd = tcmu_cmd->se_cmd;
@ -791,8 +799,12 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
bool copy_to_data_area;
size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd);
if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags))
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
*scsi_err = TCM_NO_SENSE;
if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) {
*scsi_err = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -1;
}
/*
* Must be a certain minimum size for response sense info, but
@ -819,7 +831,8 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
"cmd ring/data area\n", command_size, data_length,
udev->cmdr_size, udev->data_size);
mutex_unlock(&udev->cmdr_lock);
return TCM_INVALID_CDB_FIELD;
*scsi_err = TCM_INVALID_CDB_FIELD;
return -1;
}
while (!is_ring_space_avail(udev, tcmu_cmd, command_size, data_length)) {
@ -845,7 +858,8 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
finish_wait(&udev->wait_cmdr, &__wait);
if (!ret) {
pr_warn("tcmu: command timed out\n");
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
*scsi_err = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -1;
}
mutex_lock(&udev->cmdr_lock);
@ -902,7 +916,9 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
if (ret) {
tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt);
mutex_unlock(&udev->cmdr_lock);
return TCM_OUT_OF_RESOURCES;
*scsi_err = TCM_OUT_OF_RESOURCES;
return -1;
}
entry->hdr.cmd_id = tcmu_cmd->cmd_id;
@ -933,27 +949,23 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
mod_timer(&udev->timeout, round_jiffies_up(jiffies +
msecs_to_jiffies(udev->cmd_time_out)));
return TCM_NO_SENSE;
return 0;
}
static sense_reason_t
tcmu_queue_cmd(struct se_cmd *se_cmd)
{
struct tcmu_cmd *tcmu_cmd;
sense_reason_t ret;
sense_reason_t scsi_ret;
tcmu_cmd = tcmu_alloc_cmd(se_cmd);
if (!tcmu_cmd)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
ret = tcmu_queue_cmd_ring(tcmu_cmd);
if (ret != TCM_NO_SENSE) {
pr_err("TCMU: Could not queue command\n");
if (queue_cmd_ring(tcmu_cmd, &scsi_ret) < 0)
tcmu_free_cmd(tcmu_cmd);
}
return ret;
return scsi_ret;
}
static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry)