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nbd: use retry_poller and retry_count

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This is better naming to represent their usage.
retry_poller and count can also be used to do
async nbd_stop procedure in the following patch.

Change-Id: Ie5a74e4add3f1a6c7257df00aded8b5d52a09955
Signed-off-by: Liu Xiaodong <xiaodong.liu@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/6277
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: <dongx.yi@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
This commit is contained in:
Liu Xiaodong 2021-02-05 07:44:39 -05:00 committed by Tomasz Zawadzki
parent 2c436c00a0
commit 4c6c794be3
1 changed files with 20 additions and 14 deletions
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34
lib/nbd/nbd.c
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@ -49,7 +49,7 @@
#include "spdk/queue.h"
#define GET_IO_LOOP_COUNT 16
#define NBD_BUSY_WAITING_MS 1000
#define NBD_START_BUSY_WAITING_MS 1000
#define NBD_BUSY_POLLING_INTERVAL_US 20000
#define NBD_IO_TIMEOUT_S 60
@ -106,6 +106,9 @@ struct spdk_nbd_disk {
struct spdk_interrupt *intr;
uint32_t buf_align;
struct spdk_poller *retry_poller;
int retry_count;
struct nbd_io *io_in_recv;
TAILQ_HEAD(, nbd_io) received_io_list;
TAILQ_HEAD(, nbd_io) executed_io_list;
@ -907,8 +910,6 @@ struct spdk_nbd_start_ctx {
struct spdk_nbd_disk *nbd;
spdk_nbd_start_cb cb_fn;
void *cb_arg;
struct spdk_poller *poller;
int polling_count;
};
static void
@ -1022,18 +1023,24 @@ nbd_enable_kernel(void *arg)
}
if (rc) {
if (errno == EBUSY && ctx->polling_count-- > 0) {
if (ctx->poller == NULL) {
ctx->poller = SPDK_POLLER_REGISTER(nbd_enable_kernel, ctx,
NBD_BUSY_POLLING_INTERVAL_US);
if (errno == EBUSY) {
if (ctx->nbd->retry_poller == NULL) {
ctx->nbd->retry_count = NBD_START_BUSY_WAITING_MS * 1000ULL / NBD_BUSY_POLLING_INTERVAL_US;
ctx->nbd->retry_poller = SPDK_POLLER_REGISTER(nbd_enable_kernel, ctx,
NBD_BUSY_POLLING_INTERVAL_US);
return SPDK_POLLER_BUSY;
} else if (ctx->nbd->retry_count-- > 0) {
/* Repeatedly unregiter and register retry poller to avoid scan-build error */
spdk_poller_unregister(&ctx->nbd->retry_poller);
ctx->nbd->retry_poller = SPDK_POLLER_REGISTER(nbd_enable_kernel, ctx,
NBD_BUSY_POLLING_INTERVAL_US);
return SPDK_POLLER_BUSY;
}
/* If the kernel is busy, check back later */
return SPDK_POLLER_BUSY;
}
SPDK_ERRLOG("ioctl(NBD_SET_SOCK) failed: %s\n", spdk_strerror(errno));
if (ctx->poller) {
spdk_poller_unregister(&ctx->poller);
if (ctx->nbd->retry_poller) {
spdk_poller_unregister(&ctx->nbd->retry_poller);
}
spdk_nbd_stop(ctx->nbd);
@ -1046,8 +1053,8 @@ nbd_enable_kernel(void *arg)
return SPDK_POLLER_BUSY;
}
if (ctx->poller) {
spdk_poller_unregister(&ctx->poller);
if (ctx->nbd->retry_poller) {
spdk_poller_unregister(&ctx->nbd->retry_poller);
}
nbd_start_complete(ctx);
@ -1084,7 +1091,6 @@ spdk_nbd_start(const char *bdev_name, const char *nbd_path,
ctx->nbd = nbd;
ctx->cb_fn = cb_fn;
ctx->cb_arg = cb_arg;
ctx->polling_count = NBD_BUSY_WAITING_MS * 1000ULL / NBD_BUSY_POLLING_INTERVAL_US;
rc = spdk_bdev_open_ext(bdev_name, true, nbd_bdev_event_cb, nbd, &nbd->bdev_desc);
if (rc != 0) {