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nwfilter_dhcpsnoop: Replace virNWFilterSnoopLock macros

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Use automatic mutex management instead.

Signed-off-by: Tim Wiederhake <twiederh@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Tim Wiederhake 2022-03-16 23:08:47 +01:00
parent f61baec724
commit 5e6442b903
1 changed files with 30 additions and 59 deletions
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89
src/nwfilter/nwfilter_dhcpsnoop.c
View File

@ -85,15 +85,6 @@ struct virNWFilterSnoopState {
virMutex activeLock; /* protects Active */
};
# define virNWFilterSnoopLock() \
do { \
virMutexLock(&virNWFilterSnoopState.snoopLock); \
} while (0)
# define virNWFilterSnoopUnlock() \
do { \
virMutexUnlock(&virNWFilterSnoopState.snoopLock); \
} while (0)
# define VIR_IFKEY_LEN ((VIR_UUID_STRING_BUFLEN) + (VIR_MAC_STRING_BUFLEN))
typedef struct _virNWFilterSnoopReq virNWFilterSnoopReq;
@ -147,7 +138,7 @@ struct _virNWFilterSnoopReq {
/*
* Note about lock-order:
* 1st: virNWFilterSnoopLock()
* 1st: virNWFilterSnoopState.snoopLock
* 2nd: virNWFilterSnoopReqLock(req)
*
* Rationale: Former protects the SnoopReqs hash, latter its contents
@ -620,16 +611,13 @@ virNWFilterSnoopReqRelease(void *req0)
static virNWFilterSnoopReq *
virNWFilterSnoopReqGetByIFKey(const char *ifkey)
{
VIR_LOCK_GUARD lock = virLockGuardLock(&virNWFilterSnoopState.snoopLock);
virNWFilterSnoopReq *req;
virNWFilterSnoopLock();
req = virHashLookup(virNWFilterSnoopState.snoopReqs, ifkey);
if (req)
virNWFilterSnoopReqGet(req);
virNWFilterSnoopUnlock();
return req;
}
@ -640,11 +628,11 @@ virNWFilterSnoopReqGetByIFKey(const char *ifkey)
static void
virNWFilterSnoopReqPut(virNWFilterSnoopReq *req)
{
VIR_LOCK_GUARD lock = virLockGuardLock(&virNWFilterSnoopState.snoopLock);
if (!req)
return;
virNWFilterSnoopLock();
if (!!g_atomic_int_dec_and_test(&req->refctr)) {
/*
* delete the request:
@ -660,8 +648,6 @@ virNWFilterSnoopReqPut(virNWFilterSnoopReq *req)
req->ifkey));
}
}
virNWFilterSnoopUnlock();
}
/*
@ -1460,20 +1446,19 @@ virNWFilterDHCPSnoopThread(void *req0)
} /* while (!error) */
/* protect IfNameToKey */
virNWFilterSnoopLock();
VIR_WITH_MUTEX_LOCK_GUARD(&virNWFilterSnoopState.snoopLock) {
/* protect req->binding->portdevname & req->threadkey */
virNWFilterSnoopReqLock(req);
/* protect req->binding->portdevname & req->threadkey */
virNWFilterSnoopReqLock(req);
virNWFilterSnoopCancel(&req->threadkey);
virNWFilterSnoopCancel(&req->threadkey);
ignore_value(virHashRemoveEntry(virNWFilterSnoopState.ifnameToKey,
req->binding->portdevname));
ignore_value(virHashRemoveEntry(virNWFilterSnoopState.ifnameToKey,
req->binding->portdevname));
g_clear_pointer(&req->binding->portdevname, g_free);
g_clear_pointer(&req->binding->portdevname, g_free);
virNWFilterSnoopReqUnlock(req);
virNWFilterSnoopUnlock();
virNWFilterSnoopReqUnlock(req);
}
cleanup:
virThreadPoolFree(worker);
@ -1556,7 +1541,7 @@ virNWFilterDHCPSnoopReq(virNWFilterTechDriver *techdriver,
goto exit_snoopreqput;
}
virNWFilterSnoopLock();
virMutexLock(&virNWFilterSnoopState.snoopLock);
if (virHashAddEntry(virNWFilterSnoopState.ifnameToKey,
req->binding->portdevname,
@ -1621,7 +1606,7 @@ virNWFilterDHCPSnoopReq(virNWFilterTechDriver *techdriver,
virNWFilterSnoopReqUnlock(req);
virNWFilterSnoopUnlock();
virMutexUnlock(&virNWFilterSnoopState.snoopLock);
/* do not 'put' the req -- the thread will do this */
@ -1634,7 +1619,7 @@ virNWFilterDHCPSnoopReq(virNWFilterTechDriver *techdriver,
exit_rem_ifnametokey:
virHashRemoveEntry(virNWFilterSnoopState.ifnameToKey, binding->portdevname);
exit_snoopunlock:
virNWFilterSnoopUnlock();
virMutexUnlock(&virNWFilterSnoopState.snoopLock);
exit_snoopreqput:
if (!threadPuts)
virNWFilterSnoopReqPut(req);
@ -1695,23 +1680,19 @@ virNWFilterSnoopLeaseFileWrite(int lfd, const char *ifkey,
static void
virNWFilterSnoopLeaseFileSave(virNWFilterSnoopIPLease *ipl)
{
VIR_LOCK_GUARD lock = virLockGuardLock(&virNWFilterSnoopState.snoopLock);
virNWFilterSnoopReq *req = ipl->snoopReq;
virNWFilterSnoopLock();
if (virNWFilterSnoopState.leaseFD < 0)
virNWFilterSnoopLeaseFileOpen();
if (virNWFilterSnoopLeaseFileWrite(virNWFilterSnoopState.leaseFD,
req->ifkey, ipl) < 0)
goto error;
return;
/* keep dead leases at < ~95% of file size */
if (g_atomic_int_add(&virNWFilterSnoopState.wLeases, 1) >=
g_atomic_int_get(&virNWFilterSnoopState.nLeases) * 20)
virNWFilterSnoopLeaseFileLoad(); /* load & refresh lease file */
error:
virNWFilterSnoopUnlock();
}
/*
@ -1830,9 +1811,7 @@ virNWFilterSnoopLeaseFileLoad(void)
time_t now;
FILE *fp;
int ln = 0, tmp;
/* protect the lease file */
virNWFilterSnoopLock();
VIR_LOCK_GUARD lock = virLockGuardLock(&virNWFilterSnoopState.snoopLock);
fp = fopen(LEASEFILE, "r");
time(&now);
@ -1892,8 +1871,6 @@ virNWFilterSnoopLeaseFileLoad(void)
VIR_FORCE_FCLOSE(fp);
virNWFilterSnoopLeaseFileRefresh();
virNWFilterSnoopUnlock();
}
/*
@ -1953,11 +1930,11 @@ virNWFilterSnoopRemAllReqIter(const void *payload,
static void
virNWFilterSnoopEndThreads(void)
{
virNWFilterSnoopLock();
VIR_LOCK_GUARD lock = virLockGuardLock(&virNWFilterSnoopState.snoopLock);
virHashRemoveSet(virNWFilterSnoopState.snoopReqs,
virNWFilterSnoopRemAllReqIter,
NULL);
virNWFilterSnoopUnlock();
}
int
@ -1996,18 +1973,17 @@ virNWFilterDHCPSnoopInit(void)
void
virNWFilterDHCPSnoopEnd(const char *ifname)
{
VIR_LOCK_GUARD lock = virLockGuardLock(&virNWFilterSnoopState.snoopLock);
char *ifkey = NULL;
virNWFilterSnoopLock();
if (!virNWFilterSnoopState.snoopReqs)
goto cleanup;
return;
if (ifname) {
ifkey = (char *)virHashLookup(virNWFilterSnoopState.ifnameToKey,
ifname);
if (!ifkey)
goto cleanup;
return;
ignore_value(virHashRemoveEntry(virNWFilterSnoopState.ifnameToKey,
ifname));
@ -2020,7 +1996,7 @@ virNWFilterDHCPSnoopEnd(const char *ifname)
if (!req) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("ifkey \"%s\" has no req"), ifkey);
goto cleanup;
return;
}
/* protect req->binding->portdevname & req->threadkey */
@ -2044,9 +2020,6 @@ virNWFilterDHCPSnoopEnd(const char *ifname)
virNWFilterSnoopLeaseFileLoad();
}
cleanup:
virNWFilterSnoopUnlock();
}
void
@ -2055,13 +2028,11 @@ virNWFilterDHCPSnoopShutdown(void)
virNWFilterSnoopEndThreads();
virNWFilterSnoopJoinThreads();
virNWFilterSnoopLock();
virNWFilterSnoopLeaseFileClose();
g_clear_pointer(&virNWFilterSnoopState.ifnameToKey, g_hash_table_unref);
g_clear_pointer(&virNWFilterSnoopState.snoopReqs, g_hash_table_unref);
virNWFilterSnoopUnlock();
VIR_WITH_MUTEX_LOCK_GUARD(&virNWFilterSnoopState.snoopLock) {
virNWFilterSnoopLeaseFileClose();
g_clear_pointer(&virNWFilterSnoopState.ifnameToKey, g_hash_table_unref);
g_clear_pointer(&virNWFilterSnoopState.snoopReqs, g_hash_table_unref);
}
VIR_WITH_MUTEX_LOCK_GUARD(&virNWFilterSnoopState.activeLock) {
g_clear_pointer(&virNWFilterSnoopState.active, g_hash_table_unref);