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lib/nbd: hot remove will be correctly handled

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BUG FIX: call nbd_bdev_hot_remove will stuck if
it is called when nbd has in-flight IOs.

nbd_bdev_hot_remove is asynchronous. It will
guarantee the stop of this nbd.

nbd hot remove test will be added later

Signed-off-by: MengjinWu <mengjin.wu@intel.com>
Change-Id: I0a0dfab31fafd3d61212ade53c74ad05dbbff268
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/8039
Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Ziye Yang <ziye.yang@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: GangCao <gang.cao@intel.com>
Reviewed-by: Xiaodong Liu <xiaodong.liu@intel.com>
Reviewed-by: <dongx.yi@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
This commit is contained in:
Wu, Mengjin 2021-07-23 12:00:41 +08:00 committed by Tomasz Zawadzki
parent ea03551716
commit cc0d05b427
1 changed files with 32 additions and 7 deletions
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39
lib/nbd/nbd.c
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@ -108,6 +108,7 @@ struct spdk_nbd_disk {
struct nbd_io *io_in_recv;
TAILQ_HEAD(, nbd_io) received_io_list;
TAILQ_HEAD(, nbd_io) executed_io_list;
TAILQ_HEAD(, nbd_io) processing_io_list;
bool is_started;
bool is_closing;
@ -477,6 +478,7 @@ nbd_io_done(struct spdk_bdev_io *bdev_io, bool success, void *cb_arg)
spdk_interrupt_set_event_types(nbd->intr, SPDK_INTERRUPT_EVENT_IN | SPDK_INTERRUPT_EVENT_OUT);
}
TAILQ_REMOVE(&nbd->processing_io_list, io, tailq);
TAILQ_INSERT_TAIL(&nbd->executed_io_list, io, tailq);
if (bdev_io != NULL) {
@ -571,6 +573,7 @@ nbd_io_exec(struct spdk_nbd_disk *nbd)
if (!TAILQ_EMPTY(&nbd->received_io_list)) {
TAILQ_FOREACH_SAFE(io, &nbd->received_io_list, tailq, io_tmp) {
TAILQ_REMOVE(&nbd->received_io_list, io, tailq);
TAILQ_INSERT_TAIL(&nbd->processing_io_list, io, tailq);
ret = nbd_submit_bdev_io(nbd, io);
if (ret < 0) {
return ret;
@ -664,6 +667,7 @@ nbd_io_recv_internal(struct spdk_nbd_disk *nbd)
if (spdk_likely((!nbd->is_closing) && nbd->is_started)) {
TAILQ_INSERT_TAIL(&nbd->received_io_list, io, tailq);
} else {
TAILQ_INSERT_TAIL(&nbd->processing_io_list, io, tailq);
nbd_io_done(NULL, false, io);
}
nbd->io_in_recv = NULL;
@ -689,6 +693,7 @@ nbd_io_recv_internal(struct spdk_nbd_disk *nbd)
if (spdk_likely((!nbd->is_closing) && nbd->is_started)) {
TAILQ_INSERT_TAIL(&nbd->received_io_list, io, tailq);
} else {
TAILQ_INSERT_TAIL(&nbd->processing_io_list, io, tailq);
nbd_io_done(NULL, false, io);
}
nbd->io_in_recv = NULL;
@ -704,18 +709,22 @@ nbd_io_recv(struct spdk_nbd_disk *nbd)
{
int i, rc, ret = 0;
/*
* nbd server should not accept request after closing command
*/
if (nbd->is_closing) {
return 0;
}
for (i = 0; i < GET_IO_LOOP_COUNT; i++) {
/*
* nbd server should not accept requests after closing command
*/
if (nbd->is_closing) {
break;
}
rc = nbd_io_recv_internal(nbd);
if (rc < 0) {
return rc;
}
ret += rc;
if (nbd->is_closing) {
break;
}
}
return ret;
@ -877,7 +886,22 @@ nbd_start_kernel(void *arg)
static void
nbd_bdev_hot_remove(struct spdk_nbd_disk *nbd)
{
spdk_nbd_stop(nbd);
struct nbd_io *io, *io_tmp;
nbd->is_closing = true;
nbd_cleanup_io(nbd);
if (!TAILQ_EMPTY(&nbd->received_io_list)) {
TAILQ_FOREACH_SAFE(io, &nbd->received_io_list, tailq, io_tmp) {
TAILQ_REMOVE(&nbd->received_io_list, io, tailq);
TAILQ_INSERT_TAIL(&nbd->processing_io_list, io, tailq);
}
}
if (!TAILQ_EMPTY(&nbd->processing_io_list)) {
TAILQ_FOREACH_SAFE(io, &nbd->processing_io_list, tailq, io_tmp) {
nbd_io_done(NULL, false, io);
}
}
}
static void
@ -1105,6 +1129,7 @@ spdk_nbd_start(const char *bdev_name, const char *nbd_path,
TAILQ_INIT(&nbd->received_io_list);
TAILQ_INIT(&nbd->executed_io_list);
TAILQ_INIT(&nbd->processing_io_list);
/* Add nbd_disk to the end of disk list */
rc = nbd_disk_register(ctx->nbd);