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scsi: target/core: Make it possible to wait from more than one context for command completion

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This patch does not change any functionality but makes the patch that makes
TMF handling synchronous easier to read.

Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Cc: Mike Christie <mchristi@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: David Disseldorp <ddiss@suse.de>
Cc: Hannes Reinecke <hare@suse.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2018-11-27 15:52:00 -08:00 committed by Martin K. Petersen
parent db5b21a24e
commit a014c3647a
2 changed files with 11 additions and 6 deletions
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14
drivers/target/target_core_transport.c
View File

@ -1328,7 +1328,8 @@ void transport_init_se_cmd(
INIT_LIST_HEAD(&cmd->se_cmd_list);
INIT_LIST_HEAD(&cmd->state_list);
init_completion(&cmd->t_transport_stop_comp);
cmd->compl = NULL;
cmd->free_compl = NULL;
cmd->abrt_compl = NULL;
spin_lock_init(&cmd->t_state_lock);
INIT_WORK(&cmd->work, NULL);
kref_init(&cmd->cmd_kref);
@ -2689,7 +2690,7 @@ int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
transport_lun_remove_cmd(cmd);
}
if (aborted)
cmd->compl = &compl;
cmd->free_compl = &compl;
if (!aborted || tas)
ret = target_put_sess_cmd(cmd);
if (aborted) {
@ -2756,7 +2757,8 @@ static void target_release_cmd_kref(struct kref *kref)
{
struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
struct se_session *se_sess = se_cmd->se_sess;
struct completion *compl = se_cmd->compl;
struct completion *free_compl = se_cmd->free_compl;
struct completion *abrt_compl = se_cmd->abrt_compl;
unsigned long flags;
if (se_sess) {
@ -2767,8 +2769,10 @@ static void target_release_cmd_kref(struct kref *kref)
target_free_cmd_mem(se_cmd);
se_cmd->se_tfo->release_cmd(se_cmd);
if (compl)
complete(compl);
if (free_compl)
complete(free_compl);
if (abrt_compl)
complete(abrt_compl);
percpu_ref_put(&se_sess->cmd_count);
}

3
include/target/target_core_base.h
View File

@ -476,7 +476,8 @@ struct se_cmd {
struct se_session *se_sess;
struct se_tmr_req *se_tmr_req;
struct list_head se_cmd_list;
struct completion *compl;
struct completion *free_compl;
struct completion *abrt_compl;
const struct target_core_fabric_ops *se_tfo;
sense_reason_t (*execute_cmd)(struct se_cmd *);
sense_reason_t (*transport_complete_callback)(struct se_cmd *, bool, int *);