int
DBGP_NAME (page_wait_access) (DBGP_PARAMS it_cursor_t * itc, dp_addr_t dp, buffer_desc_t * buf_from,
buffer_desc_t ** buf_ret, int mode, int max_change)
{
buffer_desc_t decoy;
buffer_desc_t *buf;
dp_addr_t phys_dp;
itc->itc_to_reset = RWG_NO_WAIT;
itc->itc_max_transit_change = max_change;
itc->itc_must_kill_trx = 0;
if (!dp)
GPF_T1 ("Zero DP in page_fault_map_sem");
if (buf_from)
{
ITC_IN_TRANSIT (itc, dp, buf_from->bd_page);
}
else
ASSERT_IN_MAP (itc->itc_tree, dp);
buf = IT_DP_TO_BUF (itc->itc_tree, dp);
if (!buf)
{
ra_req_t * ra = NULL;
IT_DP_REMAP (itc->itc_tree, dp, phys_dp);
#ifdef MTX_DEBUG
em_check_dp (itc->itc_tree->it_extent_map, phys_dp);
if (phys_dp != dp)
em_check_dp (itc->itc_tree->it_extent_map, dp);
#endif
if ((DP_DELETED == phys_dp || dbs_is_free_page (itc->itc_tree->it_storage, phys_dp))
&& !strchr (wi_inst.wi_open_mode, 'a'))
{
log_error ("Reference to page with free remap dp = %ld, remap = %ld",
(long) phys_dp, (long) dp);
if (0 && DBS_PAGE_IN_RANGE (itc->itc_tree->it_storage, phys_dp))
dbs_page_allocated (itc->itc_tree->it_storage, phys_dp);
else
{
*buf_ret = PF_OF_DELETED;
itc->itc_must_kill_trx = 1;
itc->itc_to_reset = RWG_WAIT_ANY;
ITC_LEAVE_MAPS (itc);
return RWG_WAIT_ANY;
}
}
memset (&decoy, 0, sizeof (buffer_desc_t));
decoy.bd_being_read = 1;
if (PA_READ == mode)
decoy.bd_readers = 1;
else
BD_SET_IS_WRITE (&decoy, 1);
sethash (DP_ADDR2VOID (dp), &IT_DP_MAP (itc->itc_tree, dp)->itm_dp_to_buf, (void*)&decoy);
ITC_LEAVE_MAPS (itc);
buf = bp_get_buffer (NULL, BP_BUF_REQUIRED);
is_read_pending++;
buf->bd_being_read = 1;
buf->bd_page = dp;
buf->bd_storage = itc->itc_tree->it_storage;
buf->bd_physical_page = phys_dp;
BD_SET_IS_WRITE (buf, 0);
buf->bd_write_waiting = NULL;
if (buf_from && !itc->itc_landed)
ra = itc_read_aside (itc, buf_from, dp);
itc->itc_n_reads++;
ITC_MARK_READ (itc);
buf->bd_tree = itc->itc_tree;
buf_disk_read (buf);
is_read_pending--;
if (ra)
itc_read_ahead_blob (itc, ra, RAB_SPECULATIVE);
if (buf_from)
{
ITC_IN_TRANSIT (itc, dp, buf_from->bd_page)
}
else
void
it_free_dp_no_read (index_tree_t * it, dp_addr_t dp, int dp_type)
{
buffer_desc_t * buf;
dp_addr_t phys_dp = 0;
it_map_t * itm = IT_DP_MAP (it, dp);
ASSERT_IN_MAP (it, dp);
buf = IT_DP_TO_BUF (it, dp);
if (buf)
phys_dp = buf->bd_physical_page;
else
IT_DP_REMAP (it, dp, phys_dp);
if (buf && buf->bd_being_read)
{
log_info ("Deleting blob page while it is being read dp=%d .\n", dp);
/* the buffer can be a being read decoy with no dp, so check dps only if not being read */
}
else if (phys_dp != dp)
GPF_T1 ("A blob/hash temp dp is not supposed to be remapped in isp_free_blob_dp_no_read");
if (buf)
{
it_cursor_t itc_auto;
it_cursor_t * itc = &itc_auto;
ITC_INIT (itc, isp, NULL);
itc_from_it (itc, it);
itc->itc_itm1 = itm; /* already inside, set itc_itm1 to mark this */
/* Note that the the buf is not passed to page_wait_access. This is because of 'being read' possibility. page_fault will detect this and sync. */
page_wait_access (itc, dp, NULL, &buf, PA_WRITE, RWG_WAIT_ANY);
if (PF_OF_DELETED == buf)
{
ITC_LEAVE_MAPS (itc);
return;
}
if (dp_type != SHORT_REF (buf->bd_buffer + DP_FLAGS))
GPF_T1 ("About to delete non-blob page from blob page dir.");
ITC_IN_KNOWN_MAP (itc, dp); /* get back in, could have come out if waited */
it_free_page (it, buf);
return;
}
DBG_PT_PRINTF (("Free absent blob L=%d \n", dp));
{
dp_addr_t remap = (dp_addr_t) (ptrlong) gethash (DP_ADDR2VOID (dp), &itm->itm_remap);
dp_addr_t cpt_remap = (dp_addr_t) (ptrlong) DP_CHECKPOINT_REMAP (it->it_storage, dp);
if (cpt_remap)
GPF_T1 ("Blob/hash temp dp not expected to have cpt remap in delete no read");
if (DPF_BLOB == dp_type)
it->it_n_blob_est--;
if (remap)
{
/* if this was CREATED AND DELETED without intervening checkpoint the delete
* does not carry outside commit space. */
remhash (DP_ADDR2VOID (dp), &itm->itm_remap);
em_free_dp (it->it_extent_map, dp, DPF_BLOB == dp_type ? EXT_BLOB : EXT_INDEX);
}
else
{
if (DPF_HASH == dp_type) GPF_T1 ("a hash temp page is not supposed to be in cpt s[space");
sethash (DP_ADDR2VOID (dp), &itm->itm_remap, (void *) (ptrlong) DP_DELETED);
}
}
}
