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scsi: target: Allows backend drivers to fail with specific sense codes 

Currently, backend drivers can fail I/O with SAM_STAT_CHECK_CONDITION which
gets us TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE.

Add a new helper that allows backend drivers to fail with specific sense
codes.

This is based on a patch from Mike Christie <michael.christie@oracle.com>.

Cc: Mike Christie <michael.christie@oracle.com>
Link: https://lore.kernel.org/r/20210803145410.80147-2-s.samoylenko@yadro.com
Reviewed-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Sergey Samoylenko <s.samoylenko@yadro.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Sergey Samoylenko 2021-08-03 17:54:09 +03:00 committed by Martin K. Petersen
parent 5f492a7aa1
commit 44678553ad
3 changed files with 15 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/target/target_core_transport.c
View File

@ -736,8 +736,7 @@ static void target_complete_failure_work(struct work_struct *work)
{
struct se_cmd *cmd = container_of(work, struct se_cmd, work);
transport_generic_request_failure(cmd,
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
transport_generic_request_failure(cmd, cmd->sense_reason);
}
/*
@ -855,7 +854,8 @@ static bool target_cmd_interrupted(struct se_cmd *cmd)
}
/* May be called from interrupt context so must not sleep. */
void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
void target_complete_cmd_with_sense(struct se_cmd *cmd, u8 scsi_status,
sense_reason_t sense_reason)
{
struct se_wwn *wwn = cmd->se_sess->se_tpg->se_tpg_wwn;
int success, cpu;
@ -865,6 +865,7 @@ void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
return;
cmd->scsi_status = scsi_status;
cmd->sense_reason = sense_reason;
spin_lock_irqsave(&cmd->t_state_lock, flags);
switch (cmd->scsi_status) {
@ -893,6 +894,14 @@ void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
queue_work_on(cpu, target_completion_wq, &cmd->work);
}
EXPORT_SYMBOL(target_complete_cmd_with_sense);
void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
{
target_complete_cmd_with_sense(cmd, scsi_status, scsi_status ?
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE :
TCM_NO_SENSE);
}
EXPORT_SYMBOL(target_complete_cmd);
void target_set_cmd_data_length(struct se_cmd *cmd, int length)

1
include/target/target_core_backend.h
View File

@ -75,6 +75,7 @@ void target_backend_unregister(const struct target_backend_ops *);
void target_complete_cmd(struct se_cmd *, u8);
void target_set_cmd_data_length(struct se_cmd *, int);
void target_complete_cmd_with_sense(struct se_cmd *, u8, sense_reason_t);
void target_complete_cmd_with_length(struct se_cmd *, u8, int);
void transport_copy_sense_to_cmd(struct se_cmd *, unsigned char *);

2
include/target/target_core_base.h
View File

@ -457,6 +457,8 @@ enum target_core_dif_check {
#define TCM_ACA_TAG 0x24
struct se_cmd {
/* Used for fail with specific sense codes */
sense_reason_t sense_reason;
/* SAM response code being sent to initiator */
u8 scsi_status;
u16 scsi_sense_length;