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vhost/scsi: remove hotremoved scsi targets on device stop

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In cases where initiator closes the connection as soon
as it receives a hotremove event, there is a possibility
of SPDK vhost stopping the session before finishing up
the asynchronous target hotremoval. The target would be
either hotremoved once the session is started again
(and it registers its management poller again) or it
could cause a potential memory leak if that session is
destroyed. Even though the SCSI target itself is always
freed, the hotremoval completion callback is only called
from the management poller. At least in our RPC case,
not calling that callback results in leaking the context
structure and some json data.

We fix the above by calling all hotremove callbacks just
before stopping the device.

Change-Id: Ibfd773e1ab82b63643c57d7a9d37304e3007e38b
Signed-off-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/439445
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Pawel Wodkowski <pawelx.wodkowski@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Darek Stojaczyk 2019-01-08 01:10:53 +01:00 committed by Jim Harris
parent 934775db43
commit 3fd405c54a
1 changed files with 24 additions and 2 deletions
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26
lib/vhost/vhost_scsi.c
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@ -1356,6 +1356,7 @@ destroy_session_poller_cb(void *arg)
{
struct spdk_vhost_scsi_session *svsession = arg;
struct spdk_vhost_session *vsession = &svsession->vsession;
struct spdk_scsi_dev_vhost_state *state;
uint32_t i;
if (vsession->task_cnt > 0) {
@ -1371,11 +1372,21 @@ destroy_session_poller_cb(void *arg)
}
for (i = 0; i < SPDK_VHOST_SCSI_CTRLR_MAX_DEVS; i++) {
if (svsession->scsi_dev_state[i].dev == NULL) {
state = &svsession->scsi_dev_state[i];
if (state->dev == NULL) {
continue;
}
spdk_scsi_dev_free_io_channels(svsession->scsi_dev_state[i].dev);
spdk_scsi_dev_free_io_channels(state->dev);
if (state->status == VHOST_SCSI_DEV_REMOVING) {
state->dev = NULL;
state->status = VHOST_SCSI_DEV_REMOVED;
/* try to detach it globally */
spdk_vhost_dev_foreach_session(vsession->vdev,
spdk_vhost_scsi_session_process_removed,
(void *)(uintptr_t)i);
}
}
SPDK_INFOLOG(SPDK_LOG_VHOST, "Stopping poller for vhost controller %s\n",
@ -1398,8 +1409,19 @@ spdk_vhost_scsi_stop_cb(struct spdk_vhost_dev *vdev,
svsession = to_scsi_session(vsession);
assert(svsession != NULL);
/* Stop receiving new I/O requests */
spdk_poller_unregister(&svsession->requestq_poller);
/* Stop receiving controlq requests, also stop processing the
* asynchronous hotremove events. All the remaining events
* will be finalized by the stop_poller below.
*/
spdk_poller_unregister(&svsession->mgmt_poller);
/* Wait for all pending I/Os to complete, then process all the
* remaining hotremove events one last time.
*/
svsession->stop_poller = spdk_poller_register(destroy_session_poller_cb,
svsession, 1000);