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Send packets to remote node only via the send thread to avoid possible

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races - in this case a keepalive packet was send from wrong thread which
lead to connection dropping, because of corrupted packet.

Fix it by sending keepalive packets directly from the send thread.
As a bonus we now send keepalive packets only when connection is idle.

Submitted by:	Mikolaj Golub <to.my.trociny@gmail.com>
MFC after:	3 days
This commit is contained in:
Pawel Jakub Dawidek 2010-11-02 22:13:08 +00:00
parent 5b867e813a
commit 448efa9421
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=214692
1 changed files with 57 additions and 40 deletions
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97
sbin/hastd/primary.c
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@ -180,14 +180,21 @@ static pthread_mutex_t metadata_lock;
if (_wakeup) \
cv_signal(&hio_##name##_list_cond); \
} while (0)
#define QUEUE_TAKE1(hio, name, ncomp) do { \
#define QUEUE_TAKE1(hio, name, ncomp, timeout) do { \
bool _last; \
\
mtx_lock(&hio_##name##_list_lock[(ncomp)]); \
while (((hio) = TAILQ_FIRST(&hio_##name##_list[(ncomp)])) == NULL) { \
cv_wait(&hio_##name##_list_cond[(ncomp)], \
&hio_##name##_list_lock[(ncomp)]); \
_last = false; \
while (((hio) = TAILQ_FIRST(&hio_##name##_list[(ncomp)])) == NULL && !_last) { \
cv_timedwait(&hio_##name##_list_cond[(ncomp)], \
&hio_##name##_list_lock[(ncomp)], (timeout)); \
if ((timeout) != 0) \
_last = true; \
} \
if (hio != NULL) { \
TAILQ_REMOVE(&hio_##name##_list[(ncomp)], (hio), \
hio_next[(ncomp)]); \
} \
TAILQ_REMOVE(&hio_##name##_list[(ncomp)], (hio), \
hio_next[(ncomp)]); \
mtx_unlock(&hio_##name##_list_lock[(ncomp)]); \
} while (0)
#define QUEUE_TAKE2(hio, name) do { \
@ -1112,7 +1119,7 @@ local_send_thread(void *arg)
for (;;) {
pjdlog_debug(2, "local_send: Taking request.");
QUEUE_TAKE1(hio, send, ncomp);
QUEUE_TAKE1(hio, send, ncomp, 0);
pjdlog_debug(2, "local_send: (%p) Got request.", hio);
ggio = &hio->hio_ggio;
switch (ggio->gctl_cmd) {
@ -1176,6 +1183,38 @@ local_send_thread(void *arg)
return (NULL);
}
static void
keepalive_send(struct hast_resource *res, unsigned int ncomp)
{
struct nv *nv;
if (!ISCONNECTED(res, ncomp))
return;
assert(res->hr_remotein != NULL);
assert(res->hr_remoteout != NULL);
nv = nv_alloc();
nv_add_uint8(nv, HIO_KEEPALIVE, "cmd");
if (nv_error(nv) != 0) {
nv_free(nv);
pjdlog_debug(1,
"keepalive_send: Unable to prepare header to send.");
return;
}
if (hast_proto_send(res, res->hr_remoteout, nv, NULL, 0) < 0) {
pjdlog_common(LOG_DEBUG, 1, errno,
"keepalive_send: Unable to send request");
nv_free(nv);
rw_unlock(&hio_remote_lock[ncomp]);
remote_close(res, ncomp);
rw_rlock(&hio_remote_lock[ncomp]);
return;
}
nv_free(nv);
pjdlog_debug(2, "keepalive_send: Request sent.");
}
/*
* Thread sends request to secondary node.
*/
@ -1184,6 +1223,7 @@ remote_send_thread(void *arg)
{
struct hast_resource *res = arg;
struct g_gate_ctl_io *ggio;
time_t lastcheck, now;
struct hio *hio;
struct nv *nv;
unsigned int ncomp;
@ -1194,10 +1234,19 @@ remote_send_thread(void *arg)
/* Remote component is 1 for now. */
ncomp = 1;
lastcheck = time(NULL);
for (;;) {
pjdlog_debug(2, "remote_send: Taking request.");
QUEUE_TAKE1(hio, send, ncomp);
QUEUE_TAKE1(hio, send, ncomp, RETRY_SLEEP);
if (hio == NULL) {
now = time(NULL);
if (lastcheck + RETRY_SLEEP <= now) {
keepalive_send(res, ncomp);
lastcheck = now;
}
continue;
}
pjdlog_debug(2, "remote_send: (%p) Got request.", hio);
ggio = &hio->hio_ggio;
switch (ggio->gctl_cmd) {
@ -1882,32 +1931,6 @@ config_reload(void)
pjdlog_warning("Configuration not reloaded.");
}
static void
keepalive_send(struct hast_resource *res, unsigned int ncomp)
{
struct nv *nv;
nv = nv_alloc();
nv_add_uint8(nv, HIO_KEEPALIVE, "cmd");
if (nv_error(nv) != 0) {
nv_free(nv);
pjdlog_debug(1,
"keepalive_send: Unable to prepare header to send.");
return;
}
if (hast_proto_send(res, res->hr_remoteout, nv, NULL, 0) < 0) {
pjdlog_common(LOG_DEBUG, 1, errno,
"keepalive_send: Unable to send request");
nv_free(nv);
rw_unlock(&hio_remote_lock[ncomp]);
remote_close(res, ncomp);
rw_rlock(&hio_remote_lock[ncomp]);
return;
}
nv_free(nv);
pjdlog_debug(2, "keepalive_send: Request sent.");
}
static void
guard_one(struct hast_resource *res, unsigned int ncomp)
{
@ -1923,12 +1946,6 @@ guard_one(struct hast_resource *res, unsigned int ncomp)
return;
}
if (ISCONNECTED(res, ncomp)) {
assert(res->hr_remotein != NULL);
assert(res->hr_remoteout != NULL);
keepalive_send(res, ncomp);
}
if (ISCONNECTED(res, ncomp)) {
assert(res->hr_remotein != NULL);
assert(res->hr_remoteout != NULL);