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author | Nicholas Bellinger <nab@linux-iscsi.org> | 2016-01-25 06:44:38 (GMT) |
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committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2016-03-11 05:48:20 (GMT) |
commit | fa22e7b7741b202ee8f0cb28461189418d9b52ea (patch) | |
tree | a284e47933e66970c9f59fcbdda4f1298f07182b | |
parent | 2dbcdf33dbf61f44b29adb52338282c3d7840d0e (diff) | |
download | linux-fa22e7b7741b202ee8f0cb28461189418d9b52ea.tar.xz |
xen-scsiback: Convert to TARGET_SCF_ACK_KREF I/O krefs
This patch converts xen-scsiback to modern TARGET_SCF_ACK_KREF
usage for scsiback_cmd_done() callback path.
It also also converts TMR -> scsiback_device_action() to use
modern target_submit_tmr() code.
Acked-by: Juergen Gross <jgross@suse.com>
Tested-by: Juergen Gross <jgross@suse.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
-rw-r--r-- | drivers/xen/xen-scsiback.c | 56 |
1 files changed, 28 insertions, 28 deletions
diff --git a/drivers/xen/xen-scsiback.c b/drivers/xen/xen-scsiback.c index 3f379f7..652c8ce 100644 --- a/drivers/xen/xen-scsiback.c +++ b/drivers/xen/xen-scsiback.c @@ -388,6 +388,12 @@ static void scsiback_cmd_done(struct vscsibk_pend *pending_req) scsiback_fast_flush_area(pending_req); scsiback_do_resp_with_sense(sense_buffer, errors, resid, pending_req); scsiback_put(info); + /* + * Drop the extra KREF_ACK reference taken by target_submit_cmd_map_sgls() + * ahead of scsiback_check_stop_free() -> transport_generic_free_cmd() + * final se_cmd->cmd_kref put. + */ + target_put_sess_cmd(&pending_req->se_cmd); } static void scsiback_cmd_exec(struct vscsibk_pend *pending_req) @@ -401,7 +407,7 @@ static void scsiback_cmd_exec(struct vscsibk_pend *pending_req) rc = target_submit_cmd_map_sgls(se_cmd, sess, pending_req->cmnd, pending_req->sense_buffer, pending_req->v2p->lun, pending_req->data_len, 0, - pending_req->sc_data_direction, 0, + pending_req->sc_data_direction, TARGET_SCF_ACK_KREF, pending_req->sgl, pending_req->n_sg, NULL, 0, NULL, 0); if (rc < 0) { @@ -590,31 +596,28 @@ static void scsiback_disconnect(struct vscsibk_info *info) static void scsiback_device_action(struct vscsibk_pend *pending_req, enum tcm_tmreq_table act, int tag) { - int rc, err = FAILED; struct scsiback_tpg *tpg = pending_req->v2p->tpg; + struct scsiback_nexus *nexus = tpg->tpg_nexus; struct se_cmd *se_cmd = &pending_req->se_cmd; struct scsiback_tmr *tmr; + u64 unpacked_lun = pending_req->v2p->lun; + int rc, err = FAILED; tmr = kzalloc(sizeof(struct scsiback_tmr), GFP_KERNEL); - if (!tmr) - goto out; + if (!tmr) { + target_put_sess_cmd(se_cmd); + goto err; + } init_waitqueue_head(&tmr->tmr_wait); - transport_init_se_cmd(se_cmd, tpg->se_tpg.se_tpg_tfo, - tpg->tpg_nexus->tvn_se_sess, 0, DMA_NONE, TCM_SIMPLE_TAG, - &pending_req->sense_buffer[0]); - - rc = core_tmr_alloc_req(se_cmd, tmr, act, GFP_KERNEL); - if (rc < 0) - goto out; - - se_cmd->se_tmr_req->ref_task_tag = tag; - - if (transport_lookup_tmr_lun(se_cmd, pending_req->v2p->lun) < 0) - goto out; + rc = target_submit_tmr(&pending_req->se_cmd, nexus->tvn_se_sess, + &pending_req->sense_buffer[0], + unpacked_lun, tmr, act, GFP_KERNEL, + tag, TARGET_SCF_ACK_KREF); + if (rc) + goto err; - transport_generic_handle_tmr(se_cmd); wait_event(tmr->tmr_wait, atomic_read(&tmr->tmr_complete)); err = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ? @@ -623,7 +626,7 @@ static void scsiback_device_action(struct vscsibk_pend *pending_req, scsiback_do_resp_with_sense(NULL, err, 0, pending_req); transport_generic_free_cmd(&pending_req->se_cmd, 1); return; -out: +err: if (tmr) kfree(tmr); scsiback_do_resp_with_sense(NULL, err, 0, pending_req); @@ -1368,21 +1371,18 @@ static u32 scsiback_tpg_get_inst_index(struct se_portal_group *se_tpg) static int scsiback_check_stop_free(struct se_cmd *se_cmd) { - /* - * Do not release struct se_cmd's containing a valid TMR pointer. - * These will be released directly in scsiback_device_action() - * with transport_generic_free_cmd(). - */ - if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) - return 0; - - transport_generic_free_cmd(se_cmd, 0); - return 1; + return transport_generic_free_cmd(se_cmd, 0); } static void scsiback_release_cmd(struct se_cmd *se_cmd) { struct se_session *se_sess = se_cmd->se_sess; + struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; + + if (se_tmr && se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) { + struct scsiback_tmr *tmr = se_tmr->fabric_tmr_ptr; + kfree(tmr); + } percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag); } |