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target: Fix Task Aborted Status (TAS) handling

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This patch addresses three of long standing issues wrt to Task
Aborted Status (TAS) handling.

The first is the incorrect assumption in core_tmr_handle_tas_abort()
that TASK_ABORTED status is sent for the task referenced by TMR
ABORT_TASK, and sending TASK_ABORTED status for TMR LUN_RESET on
the same nexus the LUN_RESET was received.

The second is to ensure the lun reference count is dropped within
transport_cmd_finish_abort() by calling transport_lun_remove_cmd()
before invoking transport_cmd_check_stop_to_fabric().

The last is to fix the delayed TAS handling to allow outstanding
WRITEs to complete before sending the TASK_ABORTED status. This
includes changing transport_check_aborted_status() to avoid
processing when SCF_SEND_DELAYED_TAS has not be set, and updating
transport_send_task_abort() to drop the SCF_SENT_DELAYED_TAS
check.

Signed-off-by: Alex Leung <[email protected]>
Cc: Alex Leung <[email protected]>
Signed-off-by: Nicholas Bellinger <[email protected]>
This commit is contained in:
Alex Leung 2014-03-21 22:20:41 -07:00 • committed by Nicholas Bellinger
commit 68259b5aac
3 changed files with 18 additions and 16 deletions
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2
include/target/target_core_base.h
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@ -162,7 +162,7 @@ enum se_cmd_flags_table {
SCF_SENT_CHECK_CONDITION = 0x00000800,
SCF_OVERFLOW_BIT = 0x00001000,
SCF_UNDERFLOW_BIT = 0x00002000,
SCF_SENT_DELAYED_TAS = 0x00004000,
SCF_SEND_DELAYED_TAS = 0x00004000,
SCF_ALUA_NON_OPTIMIZED = 0x00008000,
SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC = 0x00020000,
SCF_ACK_KREF = 0x00040000,