/*
* This function returns a free (not in the LRU queue) acl cache entry.
* It must be called with the cm_aclLock lock held
*/
static cm_aclent_t *GetFreeACLEnt(cm_scache_t * scp)
{
cm_aclent_t *aclp;
cm_scache_t *ascp = 0;
if (cm_data.aclLRUp == NULL)
osi_panic("empty aclent LRU", __FILE__, __LINE__);
if (cm_data.aclLRUEndp == NULL)
osi_panic("inconsistent aclent LRUEndp == NULL", __FILE__, __LINE__);
aclp = cm_data.aclLRUEndp;
osi_QRemoveHT((osi_queue_t **) &cm_data.aclLRUp, (osi_queue_t **) &cm_data.aclLRUEndp, &aclp->q);
if (aclp->backp && scp != aclp->backp) {
ascp = aclp->backp;
lock_ReleaseWrite(&cm_aclLock);
lock_ObtainWrite(&ascp->rw);
lock_ObtainWrite(&cm_aclLock);
}
CleanupACLEnt(aclp);
if (ascp)
lock_ReleaseWrite(&ascp->rw);
return aclp;
}
/*
* Get an acl cache entry for a particular user and file, or return that it doesn't exist.
* Called with the scp write locked.
*/
long cm_FindACLCache(cm_scache_t *scp, cm_user_t *userp, afs_uint32 *rightsp)
{
cm_aclent_t *aclp;
long retval = -1;
time_t now = time(NULL);
lock_AssertWrite(&scp->rw);
lock_ObtainWrite(&cm_aclLock);
*rightsp = 0; /* get a new acl from server if we don't find a
* current entry
*/
for (aclp = scp->randomACLp; aclp; aclp = aclp->nextp) {
if (aclp->userp == userp) {
if (aclp->tgtLifetime && aclp->tgtLifetime <= now) {
/* ticket expired */
osi_QRemoveHT((osi_queue_t **) &cm_data.aclLRUp, (osi_queue_t **) &cm_data.aclLRUEndp, &aclp->q);
CleanupACLEnt(aclp);
/* move to the tail of the LRU queue */
osi_QAddT((osi_queue_t **) &cm_data.aclLRUp,
(osi_queue_t **) &cm_data.aclLRUEndp,
&aclp->q);
} else {
*rightsp = aclp->randomAccess;
if (cm_data.aclLRUp != aclp) {
/* move to the head of the LRU queue */
osi_QRemoveHT((osi_queue_t **) &cm_data.aclLRUp, (osi_queue_t **) &cm_data.aclLRUEndp, &aclp->q);
osi_QAddH((osi_queue_t **) &cm_data.aclLRUp,
(osi_queue_t **) &cm_data.aclLRUEndp,
&aclp->q);
}
retval = 0; /* success */
}
break;
}
}
lock_ReleaseWrite(&cm_aclLock);
return retval;
}
