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author | Nicholas Bellinger <nab@linux-iscsi.org> | 2017-06-03 06:41:03 -0700 |
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committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2017-07-06 22:57:55 -0700 |
commit | eeb64d239ea664592ff8f1bce5546209a6593df5 (patch) | |
tree | adaa7dd7f68e731547b44d74c42c6bc9d4448bd4 /drivers/target/target_core_transport.c | |
parent | 12f66e4a0f7b5624901ba4301210e026c9ddf78d (diff) | |
download | linux-eeb64d239ea664592ff8f1bce5546209a6593df5.tar.bz2 |
target: Add support for TMR percpu reference counting
This patch introduces TMR percpu reference counting using
se_lun->lun_ref in transport_lookup_tmr_lun(), following
how existing non TMR per se_lun reference counting works
within transport_lookup_cmd_lun().
It also adds explicit transport_lun_remove_cmd() calls to
drop the reference in the three tmr related locations that
invoke transport_cmd_check_stop_to_fabric();
- target_tmr_work() during normal ->queue_tm_rsp()
- target_complete_tmr_failure() during error ->queue_tm_rsp()
- transport_generic_handle_tmr() during early failure
Also, note the exception paths in transport_generic_free_cmd()
and transport_cmd_finish_abort() already check SCF_SE_LUN_CMD,
and will invoke transport_lun_remove_cmd() when necessary.
Reviewed-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Reviewed-by: Quinn Tran <quinn.tran@cavium.com>
Cc: Mike Christie <mchristi@redhat.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/target_core_transport.c')
-rw-r--r-- | drivers/target/target_core_transport.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index f1b3a46bdcaf..97a01f48068b 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -1590,6 +1590,7 @@ static void target_complete_tmr_failure(struct work_struct *work) se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; se_cmd->se_tfo->queue_tm_rsp(se_cmd); + transport_lun_remove_cmd(se_cmd); transport_cmd_check_stop_to_fabric(se_cmd); } @@ -3201,6 +3202,7 @@ static void target_tmr_work(struct work_struct *work) cmd->se_tfo->queue_tm_rsp(cmd); check_stop: + transport_lun_remove_cmd(cmd); transport_cmd_check_stop_to_fabric(cmd); } @@ -3223,6 +3225,7 @@ int transport_generic_handle_tmr( pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d" "ref_tag: %llu tag: %llu\n", cmd->se_tmr_req->function, cmd->se_tmr_req->ref_task_tag, cmd->tag); + transport_lun_remove_cmd(cmd); transport_cmd_check_stop_to_fabric(cmd); return 0; } |