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lib/vhost: separate out bdev events handling

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Generic vhost-blk layer is responsible for opening the bdev
attached to the vhost controller.

This patch adds vhost_user_bdev_event_cb() that is called
for vhost_user backend. This function will be replaced with
a callback to particular virtio-blk transport.

Having this piped through to the transports, allows
to adjust their behavior upon bdev events.

Signed-off-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Change-Id: Id73f5131b6e57f0354e970d0bce92716ec69985b
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/12132
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
This commit is contained in:
Tomasz Zawadzki 2022-03-30 14:46:23 +02:00
parent 34c7b6c18c
commit aec00435a0
1 changed files with 49 additions and 33 deletions
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82
lib/vhost/vhost_blk.c
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@ -1134,6 +1134,25 @@ vhost_blk_poller_set_interrupt_mode(struct spdk_poller *poller, void *cb_arg, bo
vhost_user_session_set_interrupt_mode(&bvsession->vsession, interrupt_mode);
}
typedef void (*bdev_event_cb_complete)(struct spdk_vhost_dev *vdev, void *ctx);
static void
bdev_event_cpl_cb(struct spdk_vhost_dev *vdev, void *ctx)
{
enum spdk_bdev_event_type type = (enum spdk_bdev_event_type)(uintptr_t)ctx;
struct spdk_vhost_blk_dev *bvdev;
if (type == SPDK_BDEV_EVENT_REMOVE) {
/* All sessions have been notified, time to close the bdev */
bvdev = to_blk_dev(vdev);
assert(bvdev != NULL);
spdk_put_io_channel(bvdev->dummy_io_channel);
spdk_bdev_close(bvdev->bdev_desc);
bvdev->bdev_desc = NULL;
bvdev->bdev = NULL;
}
}
static int
vhost_session_bdev_resize_cb(struct spdk_vhost_dev *vdev,
struct spdk_vhost_session *vsession,
@ -1150,34 +1169,18 @@ vhost_session_bdev_resize_cb(struct spdk_vhost_dev *vdev,
}
static void
blk_resize_cb(void *resize_ctx)
vhost_user_blk_resize_cb(struct spdk_vhost_dev *vdev, bdev_event_cb_complete cb, void *cb_arg)
{
struct spdk_vhost_blk_dev *bvdev = resize_ctx;
spdk_vhost_lock();
vhost_user_dev_foreach_session(&bvdev->vdev, vhost_session_bdev_resize_cb,
NULL, NULL);
vhost_user_dev_foreach_session(vdev, vhost_session_bdev_resize_cb,
cb, cb_arg);
spdk_vhost_unlock();
}
static void
vhost_dev_bdev_remove_cpl_cb(struct spdk_vhost_dev *vdev, void *ctx)
{
/* All sessions have been notified, time to close the bdev */
struct spdk_vhost_blk_dev *bvdev = to_blk_dev(vdev);
assert(bvdev != NULL);
spdk_put_io_channel(bvdev->dummy_io_channel);
spdk_bdev_close(bvdev->bdev_desc);
bvdev->bdev_desc = NULL;
bvdev->bdev = NULL;
}
static int
vhost_session_bdev_remove_cb(struct spdk_vhost_dev *vdev,
struct spdk_vhost_session *vsession,
void *ctx)
vhost_user_session_bdev_remove_cb(struct spdk_vhost_dev *vdev,
struct spdk_vhost_session *vsession,
void *ctx)
{
struct spdk_vhost_blk_session *bvsession;
int rc;
@ -1204,35 +1207,48 @@ vhost_session_bdev_remove_cb(struct spdk_vhost_dev *vdev,
}
static void
bdev_remove_cb(void *remove_ctx)
vhost_user_bdev_remove_cb(struct spdk_vhost_dev *vdev, bdev_event_cb_complete cb, void *cb_arg)
{
struct spdk_vhost_blk_dev *bvdev = remove_ctx;
SPDK_WARNLOG("%s: hot-removing bdev - all further requests will fail.\n",
bvdev->vdev.name);
vdev->name);
spdk_vhost_lock();
vhost_user_dev_foreach_session(&bvdev->vdev, vhost_session_bdev_remove_cb,
vhost_dev_bdev_remove_cpl_cb, NULL);
vhost_user_dev_foreach_session(vdev, vhost_user_session_bdev_remove_cb,
cb, cb_arg);
spdk_vhost_unlock();
}
static void
vhost_user_bdev_event_cb(enum spdk_bdev_event_type type, struct spdk_vhost_dev *vdev,
bdev_event_cb_complete cb, void *cb_arg)
{
switch (type) {
case SPDK_BDEV_EVENT_REMOVE:
vhost_user_bdev_remove_cb(vdev, cb, cb_arg);
break;
case SPDK_BDEV_EVENT_RESIZE:
vhost_user_blk_resize_cb(vdev, cb, cb_arg);
break;
default:
assert(false);
return;
}
}
static void
bdev_event_cb(enum spdk_bdev_event_type type, struct spdk_bdev *bdev,
void *event_ctx)
{
struct spdk_vhost_dev *vdev = (struct spdk_vhost_dev *)event_ctx;
SPDK_DEBUGLOG(vhost_blk, "Bdev event: type %d, name %s\n",
type,
bdev->name);
switch (type) {
case SPDK_BDEV_EVENT_REMOVE:
SPDK_NOTICELOG("bdev name (%s) received event(SPDK_BDEV_EVENT_REMOVE)\n", bdev->name);
bdev_remove_cb(event_ctx);
break;
case SPDK_BDEV_EVENT_RESIZE:
SPDK_NOTICELOG("bdev name (%s) received event(SPDK_BDEV_EVENT_RESIZE)\n", bdev->name);
blk_resize_cb(event_ctx);
vhost_user_bdev_event_cb(type, vdev, bdev_event_cpl_cb, (void *)type);
break;
default:
SPDK_NOTICELOG("Unsupported bdev event: type %d\n", type);