struct item *
slab_get_item(uint8_t cid)
{
rstatus_t status;
struct slabclass *c;
struct slabinfo *sinfo;
struct slab *slab;
ASSERT(cid >= SLABCLASS_MIN_ID && cid < nctable);
c = &ctable[cid];
if (itemx_empty()) {
status = slab_evict();
if (status != FC_OK) {
return NULL;
}
}
if (!TAILQ_EMPTY(&c->partial_msinfoq)) {
return _slab_get_item(cid);
}
if (!TAILQ_EMPTY(&free_msinfoq)) {
/* move memory slab from free to partial q */
sinfo = TAILQ_FIRST(&free_msinfoq);
ASSERT(nfree_msinfoq > 0);
nfree_msinfoq--;
TAILQ_REMOVE(&free_msinfoq, sinfo, tqe);
/* init partial sinfo */
TAILQ_INSERT_HEAD(&c->partial_msinfoq, sinfo, tqe);
/* sid is already initialized by slab_init */
/* addr is already initialized by slab_init */
sinfo->nalloc = 0;
sinfo->nfree = 0;
sinfo->cid = cid;
/* mem is already initialized by slab_init */
ASSERT(sinfo->mem == 1);
/* init slab of partial sinfo */
slab = slab_from_maddr(sinfo->addr, false);
slab->magic = SLAB_MAGIC;
slab->cid = cid;
/* unused[] is left uninitialized */
slab->sid = sinfo->sid;
/* data[] is initialized on-demand */
return _slab_get_item(cid);
}
ASSERT(!TAILQ_EMPTY(&full_msinfoq));
ASSERT(nfull_msinfoq > 0);
status = slab_drain();
if (status != FC_OK) {
return NULL;
}
return slab_get_item(cid);
}
struct item *
slab_get_item(uint8_t id)
{
struct item *it;
ASSERT(id >= SLABCLASS_MIN_ID && id <= profile_last_id);
it = _slab_get_item(id);
return it;
}
