// if successful returns length of value
int ark_exist_start(_ARK *_arkp, int tid, tcb_t *tcbp)
{
scb_t *scbp = &(_arkp->poolthreads[tid]);
rcb_t *rcbp = &(_arkp->rcbs[tcbp->rtag]);
ark_io_list_t *bl_array = NULL;
int32_t rc = 0;
int32_t state = ARK_CMD_DONE;
// Now that we have the hash entry, get the block
// that holds the control information for the entry.
tcbp->hblk = HASH_LBA(HASH_GET(_arkp->ht, rcbp->pos));
// If there is no control block for this hash
// entry, then the key is not present in the hash.
// Set the error
if ( tcbp->hblk == 0 )
{
KV_TRC_FFDC(pAT, "rc = ENOENT key %p, klen %"PRIu64"",
rcbp->key, rcbp->klen);
rcbp->res = -1;
rcbp->rc = ENOENT;
state = ARK_CMD_DONE;
goto ark_exist_start_err;
}
// Set up the in-buffer to read in the hash bucket
// that contains the key
tcbp->blen = bl_len(_arkp->bl, tcbp->hblk);
rc = bt_growif(&(tcbp->inb), &(tcbp->inb_orig), &(tcbp->inblen),
(tcbp->blen * _arkp->bsize));
if (rc != 0)
{
rcbp->res = -1;
rcbp->rc = rc;
state = ARK_CMD_DONE;
goto ark_exist_start_err;
}
// Create a chain of blocks to be passed to be read
bl_array = bl_chain(_arkp->bl, tcbp->hblk, tcbp->blen);
if (bl_array == NULL)
{
rcbp->rc = ENOMEM;
rcbp->res = -1;
state = ARK_CMD_DONE;
goto ark_exist_start_err;
}
scbp->poolstats.io_cnt += tcbp->blen;
rc = ea_async_io_mod(_arkp, ARK_EA_READ, (void *)tcbp->inb, bl_array,
tcbp->blen, 0, tcbp->ttag, ARK_EXIST_FINISH);
if (rc < 0)
{
rcbp->rc = -rc;
rcbp->res = -1;
state = ARK_CMD_DONE;
goto ark_exist_start_err;
}
else if (rc == 0)
{
state = ARK_IO_HARVEST;
}
else
{
state = ark_exist_finish(_arkp, tid, tcbp);
}
ark_exist_start_err:
return state;
}
// if successful returns length of value
void ark_exist_start(_ARK *_arkp, int tid, tcb_t *tcbp)
{
scb_t *scbp = &(_arkp->poolthreads[tid]);
rcb_t *rcbp = &(_arkp->rcbs[tcbp->rtag]);
tcb_t *iotcbp = &(_arkp->tcbs[rcbp->ttag]);
iocb_t *iocbp = &(_arkp->iocbs[rcbp->ttag]);
ark_io_list_t *bl_array = NULL;
int32_t rc = 0;
// Now that we have the hash entry, get the block
// that holds the control information for the entry.
tcbp->hblk = HASH_LBA(HASH_GET(_arkp->ht, rcbp->pos));
// If there is no control block for this hash
// entry, then the key is not present in the hash.
// Set the error
if ( tcbp->hblk == 0 )
{
KV_TRC_FFDC(pAT, "rc = ENOENT key %p, klen %"PRIu64" ttag:%d",
rcbp->key, rcbp->klen, tcbp->ttag);
rcbp->res = -1;
rcbp->rc = ENOENT;
tcbp->state = ARK_CMD_DONE;
goto ark_exist_start_err;
}
// Set up the in-buffer to read in the hash bucket
// that contains the key
tcbp->blen = bl_len(_arkp->bl, tcbp->hblk);
rc = bt_growif(&(tcbp->inb), &(tcbp->inb_orig), &(tcbp->inblen),
(tcbp->blen * _arkp->bsize));
if (rc != 0)
{
KV_TRC_FFDC(pAT, "bt_growif failed tcbp:%p ttag:%d", tcbp, tcbp->ttag);
rcbp->res = -1;
rcbp->rc = rc;
tcbp->state = ARK_CMD_DONE;
goto ark_exist_start_err;
}
// Create a chain of blocks to be passed to be read
bl_array = bl_chain(_arkp->bl, tcbp->hblk, tcbp->blen);
if (bl_array == NULL)
{
KV_TRC_FFDC(pAT, "bl_chain failed tcbp:%p ttag:%d", tcbp, tcbp->ttag);
rcbp->rc = ENOMEM;
rcbp->res = -1;
tcbp->state = ARK_CMD_DONE;
goto ark_exist_start_err;
}
scbp->poolstats.io_cnt += tcbp->blen;
KV_TRC_IO(pAT, "read hash entry ttag:%d", tcbp->ttag);
ea_async_io_init(_arkp, ARK_EA_READ, (void *)tcbp->inb, bl_array,
tcbp->blen, 0, tcbp->ttag, ARK_EXIST_FINISH);
if (ea_async_io_schedule(_arkp, tid, iotcbp, iocbp) &&
ea_async_io_harvest (_arkp, tid, iotcbp, iocbp, rcbp))
{
ark_exist_finish(_arkp, tid, tcbp);
}
ark_exist_start_err:
return;
}