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target: Address legacy PYX_TRANSPORT_* return code breakage

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This patch removes legacy usage of PYX_TRANSPORT_* return codes in a number
of locations and addresses cases where transport_generic_request_failure()
was returning the incorrect sense upon CHECK_CONDITION status after the
v3.1 converson to use errno return codes.

This includes the conversion of transport_generic_request_failure() to
process cmd->scsi_sense_reason and handle extra TCM_RESERVATION_CONFLICT
before calling transport_send_check_condition_and_sense() to queue up
response status.  It also drops PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES legacy
usgae, and returns TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE w/ a response
for these cases.

transport_generic_allocate_tasks(), transport_generic_new_cmd(), backend
SCF_SCSI_DATA_SG_IO_CDB ->do_task(), and emulated ->execute_task() have
all been updated to set se_cmd->scsi_sense_reason and return errno codes
universally upon failure.  This includes cmd->scsi_sense_reason assignment
in target_core_alua.c, target_core_pr.c and target_core_cdb.c emulation code.

Finally it updates fabric modules to remove the legacy usage, and for
TFO->new_cmd_map() callers forwards return values outside of fabric code.
iscsi-target has also been updated to remove a handful of special cases
related to the cleanup and signaling QUEUE_FULL handling w/ ft_write_pending()

(v2: Drop extra SCF_SCSI_CDB_EXCEPTION check during failure from
     transport_generic_new_cmd, and re-add missing task->task_error_status
     assignment in transport_complete_task)

Cc: Christoph Hellwig <hch@lst.de>
Cc: stable@kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2011-11-04 02:36:16 -07:00
parent 5611cc4572
commit 03e98c9eb9
16 changed files with 281 additions and 303 deletions
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24
drivers/target/loopback/tcm_loop.c
View file

@ -148,22 +148,8 @@ static int tcm_loop_new_cmd_map(struct se_cmd *se_cmd)
* Allocate the necessary tasks to complete the received CDB+data
*/
ret = transport_generic_allocate_tasks(se_cmd, sc->cmnd);
if (ret == -ENOMEM) {
/* Out of Resources */
return PYX_TRANSPORT_LU_COMM_FAILURE;
} else if (ret == -EINVAL) {
/*
* Handle case for SAM_STAT_RESERVATION_CONFLICT
*/
if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
return PYX_TRANSPORT_RESERVATION_CONFLICT;
/*
* Otherwise, return SAM_STAT_CHECK_CONDITION and return
* sense data.
*/
return PYX_TRANSPORT_USE_SENSE_REASON;
}
if (ret != 0)
return ret;
/*
* For BIDI commands, pass in the extra READ buffer
* to transport_generic_map_mem_to_cmd() below..
@ -194,12 +180,8 @@ static int tcm_loop_new_cmd_map(struct se_cmd *se_cmd)
}
/* Tell the core about our preallocated memory */
ret = transport_generic_map_mem_to_cmd(se_cmd, scsi_sglist(sc),
return transport_generic_map_mem_to_cmd(se_cmd, scsi_sglist(sc),
scsi_sg_count(sc), sgl_bidi, sgl_bidi_count);
if (ret < 0)
return PYX_TRANSPORT_LU_COMM_FAILURE;
return 0;
}
/*