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ocf: wait for pendings reqs in unregister

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Unregister OCF bdev using poller that checks if
  cache has pending requests.

This prevents ocf_mngt_cache_stop causing
  deadlock on reads in WT mode.

Submodule commit was updated to get new function ocf_cache_has_pending_requests().

Change-Id: Iee4cb09bc2bb859a6dcce89994c686f64924c942
Signed-off-by: Vitaliy Mysak <vitaliy.mysak@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/446604
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Vitaliy Mysak 2019-03-01 18:25:35 +00:00 committed by Jim Harris
parent 25df73f5d2
commit e862b6434a
1 changed files with 42 additions and 3 deletions
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45
lib/bdev/ocf/vbdev_ocf.c
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@ -195,11 +195,10 @@ close_spdk_dev:
return rc;
}
/* Free OCF resources, close base bdevs */
/* Finish unregister operation */
static void
unregister_cb(void *opaque)
unregister_finish(struct vbdev_ocf *vbdev)
{
struct vbdev_ocf *vbdev = opaque;
int status;
status = stop_vbdev(vbdev);
@ -212,6 +211,46 @@ unregister_cb(void *opaque)
}
spdk_bdev_destruct_done(&vbdev->exp_bdev, status);
vbdev_ocf_mngt_continue(vbdev, 0);
}
/* Wait for all OCF requests to finish */
static void
wait_for_requests_poll(struct vbdev_ocf *vbdev)
{
if (ocf_cache_has_pending_requests(vbdev->ocf_cache)) {
return;
}
vbdev_ocf_mngt_continue(vbdev, 0);
}
/* Start waiting for OCF requests to finish */
static void
wait_for_requests(struct vbdev_ocf *vbdev)
{
vbdev_ocf_mngt_poll(vbdev, wait_for_requests_poll);
}
/* Procedures called during unregister */
vbdev_ocf_mngt_fn unregister_path[] = {
wait_for_requests,
unregister_finish,
NULL
};
/* Start asynchronous management operation using unregister_path */
static void
unregister_cb(void *opaque)
{
struct vbdev_ocf *vbdev = opaque;
int rc;
rc = vbdev_ocf_mngt_start(vbdev, unregister_path, NULL, NULL);
if (rc) {
SPDK_ERRLOG("Unable to unregister OCF bdev: %d\n", rc);
spdk_bdev_destruct_done(&vbdev->exp_bdev, rc);
}
}
/* Unregister io device with callback to unregister_cb