/*
Marshal the header without reassigning a new timestamp.
*/
long SDMmessage::MarshalHeaderOldTimeStamp(char* buf)
{
buf[0] = MsgName;
PUT_LONG(&buf[1],sec);
PUT_LONG(&buf[5],subsec);
PUT_USHORT(&buf[9],msg_length);
return HEADER_SIZE;
}
long SDMmessage::MarshalHeader(char* buf)
{
#ifdef __VXWORKS__
struct timespec time;
clock_gettime(CLOCK_REALTIME, &time);
sec = time.tv_sec;
subsec = time.tv_nsec/1000;
#else
struct timeval time;
gettimeofday(&time,NULL);
sec = time.tv_sec;
subsec = time.tv_usec;
#endif
buf[0] = MsgName;
PUT_LONG(&buf[1],sec);
PUT_LONG(&buf[5],subsec);
PUT_USHORT(&buf[9],msg_length);
return HEADER_SIZE;
}
/*
****************************************************************
* Atualiza o bloco de informações da FAT32 *
****************************************************************
*/
void
update_fat32_info (void)
{
UNI *up = &uni;
FSINFO fsinfo;
/*
* Só é chamada se for RW
*/
if (up->u_fs_info == 0)
return;
#undef DEBUG
#ifdef DEBUG
printf
( "u_disk_infree = %d, u_infree = %d\n",
up->u_disk_infree, up->u_infree
);
#endif DEBUG
if (up->u_disk_infree == up->u_infree)
return;
/*
* Atualiza o bloco de informações
*/
#ifdef DEBUG
printf ("Atualizando ...\n");
#endif DEBUG
bread (up->u_fs_info, &fsinfo);
/*** bread (up->u_fs_info + 1, (void *)&fsinfo + BLSZ); ***/
PUT_LONG (up->u_infree, &fsinfo.fs_infree);
bwrite (up->u_fs_info, &fsinfo);
/*** bwrite (up->u_fs_info + 1, (void *)&fsinfo + BLSZ); ***/
up->u_disk_infree = up->u_infree;
} /* update_fat32_info */
/* Finds a free block and adds information to update array and cw_set */
block_id swap_root_or_directory_block(int parent_blk_lvl, int child_blk_lvl, srch_hist *dir_hist_ptr, block_id child_blk_id,
sm_uc_ptr_t child_blk_ptr, kill_set *kill_set_list, trans_num curr_tn)
{
sgmnt_data_ptr_t csd;
sgmnt_addrs *csa;
node_local_ptr_t cnl;
srch_blk_status bmlhist, freeblkhist;
block_id hint_blk_num, free_blk_id, parent_blk_id;
boolean_t free_blk_recycled;
int4 master_bit, num_local_maps, free_bit, hint_bit, maxbitsthismap;
uint4 total_blks;
int blk_seg_cnt, blk_size;
sm_uc_ptr_t parent_blk_ptr, bn_ptr, saved_blk;
blk_segment *bs1, *bs_ptr;
int parent_blk_size, child_blk_size, bsiz;
int rec_size1, curr_offset, bpntr_end, hdr_len;
int tmp_cmpc;
cw_set_element *tmpcse;
jnl_buffer_ptr_t jbbp; /* jbbp is non-NULL only if before-image journaling */
unsigned short temp_ushort;
unsigned long temp_long;
unsigned char save_cw_set_depth;
DCL_THREADGBL_ACCESS;
SETUP_THREADGBL_ACCESS;
csd = cs_data;
csa = cs_addrs;
cnl = csa->nl;
blk_size = csd->blk_size;
/* Find a free/recycled block for new block location. */
hint_blk_num = 0;
total_blks = csa->ti->total_blks;
num_local_maps = DIVIDE_ROUND_UP(total_blks, BLKS_PER_LMAP);
master_bit = bmm_find_free((hint_blk_num / BLKS_PER_LMAP), csa->bmm, num_local_maps);
if ((NO_FREE_SPACE == master_bit))
{
t_abort(gv_cur_region, csa);
return ABORT_SWAP;
}
bmlhist.blk_num = (block_id)master_bit * BLKS_PER_LMAP;
if (NULL == (bmlhist.buffaddr = t_qread(bmlhist.blk_num, (sm_int_ptr_t)&bmlhist.cycle, &bmlhist.cr)))
{
assert(t_tries < CDB_STAGNATE);
t_retry((enum cdb_sc)rdfail_detail);
return RETRY_SWAP;
}
hint_bit = 0;
maxbitsthismap = (master_bit != (num_local_maps - 1)) ? BLKS_PER_LMAP : total_blks - bmlhist.blk_num;
free_bit = bm_find_blk(hint_bit, bmlhist.buffaddr + SIZEOF(blk_hdr), maxbitsthismap, &free_blk_recycled);
free_blk_id = bmlhist.blk_num + free_bit;
if (DIR_ROOT >= free_blk_id)
{ /* Bitmap block 0 and directory tree root block 1 should always be marked busy. */
assert(t_tries < CDB_STAGNATE);
t_retry(cdb_sc_badbitmap);
return RETRY_SWAP;
}
if (child_blk_id <= free_blk_id)
{ /* stop swapping root or DT blocks once the database is truncated well enough. A good heuristic for this is to check
* if the block is to be swapped into a higher block number and if so do not swap
*/
t_abort(gv_cur_region, csa);
return ABORT_SWAP;
}
/* ====== begin update array ======
* Four blocks get changed.
* 1. Free block becomes busy and gains the contents of child (root block/directory tree block)
* 2. Parent block in directory tree remains busy, but points to new root block location.
* 3. Free block's corresponding bitmap reflects above change.
* 4. Child block gets marked recycled in bitmap. (GVCST_BMP_MARK_FREE)
*/
parent_blk_ptr = dir_hist_ptr->h[parent_blk_lvl].buffaddr; /* parent_blk_lvl is 0 iff we're moving a gvt root block */
parent_blk_id = dir_hist_ptr->h[parent_blk_lvl].blk_num;
CHECK_AND_RESET_UPDATE_ARRAY;
if (free_blk_recycled)
{ /* Otherwise, it's a completely free block, in which case no need to read. */
freeblkhist.blk_num = (block_id)free_blk_id;
if (NULL == (freeblkhist.buffaddr = t_qread(free_blk_id, (sm_int_ptr_t)&freeblkhist.cycle, &freeblkhist.cr)))
{
assert(t_tries < CDB_STAGNATE);
t_retry((enum cdb_sc)rdfail_detail);
return RETRY_SWAP;
}
}
child_blk_size = ((blk_hdr_ptr_t)child_blk_ptr)->bsiz;
BLK_INIT(bs_ptr, bs1);
BLK_ADDR(saved_blk, child_blk_size, unsigned char);
memcpy(saved_blk, child_blk_ptr, child_blk_size);
BLK_SEG(bs_ptr, saved_blk + SIZEOF(blk_hdr), child_blk_size - SIZEOF(blk_hdr));
assert(blk_seg_cnt == child_blk_size);
if (!BLK_FINI(bs_ptr, bs1))
{
assert(t_tries < CDB_STAGNATE);
t_retry(cdb_sc_blkmod);
return RETRY_SWAP;
}
tmpcse = &cw_set[cw_set_depth];
(free_blk_recycled) ? BIT_SET_RECYCLED_AND_CLEAR_FREE(tmpcse->blk_prior_state)
: BIT_CLEAR_RECYCLED_AND_SET_FREE(tmpcse->blk_prior_state);
t_create(free_blk_id, (unsigned char *)bs1, 0, 0, child_blk_lvl);
tmpcse->mode = gds_t_acquired;
if (!free_blk_recycled || !cs_data->db_got_to_v5_once)
tmpcse->old_block = NULL;
else
{
tmpcse->old_block = freeblkhist.buffaddr;
tmpcse->cr = freeblkhist.cr;
tmpcse->cycle = freeblkhist.cycle;
jbbp = (JNL_ENABLED(csa) && csa->jnl_before_image) ? csa->jnl->jnl_buff : NULL;
if ((NULL != jbbp) && (((blk_hdr_ptr_t)tmpcse->old_block)->tn < jbbp->epoch_tn))
{
bsiz = ((blk_hdr_ptr_t)(tmpcse->old_block))->bsiz;
if (bsiz > blk_size)
{
assert(CDB_STAGNATE > t_tries);
t_retry(cdb_sc_lostbmlcr);
return RETRY_SWAP;
}
JNL_GET_CHECKSUM_ACQUIRED_BLK(tmpcse, csd, csa, tmpcse->old_block, bsiz);
}
}
/* 2. Parent block in directory tree remains busy, but points to new child block location. */
curr_offset = dir_hist_ptr->h[parent_blk_lvl].curr_rec.offset;
parent_blk_size = ((blk_hdr_ptr_t)parent_blk_ptr)->bsiz;
GET_RSIZ(rec_size1, (parent_blk_ptr + curr_offset));
if ((parent_blk_size < rec_size1 + curr_offset) || (BSTAR_REC_SIZE > rec_size1))
{
assert(t_tries < CDB_STAGNATE);
t_retry(cdb_sc_blkmod);
return RETRY_SWAP;
}
BLK_INIT(bs_ptr, bs1);
if (0 == parent_blk_lvl)
/* There can be collation stuff in the record value after the block pointer. See gvcst_root_search. */
hdr_len = SIZEOF(rec_hdr) + gv_altkey->end + 1 - EVAL_CMPC((rec_hdr_ptr_t)(parent_blk_ptr + curr_offset));
else
hdr_len = rec_size1 - SIZEOF(block_id);
bpntr_end = curr_offset + hdr_len + SIZEOF(block_id);
BLK_SEG(bs_ptr, parent_blk_ptr + SIZEOF(blk_hdr), curr_offset + hdr_len - SIZEOF(blk_hdr));
BLK_ADDR(bn_ptr, SIZEOF(block_id), unsigned char);
PUT_LONG(bn_ptr, free_blk_id);
BLK_SEG(bs_ptr, bn_ptr, SIZEOF(block_id));
BLK_SEG(bs_ptr, parent_blk_ptr + bpntr_end, parent_blk_size - bpntr_end);
assert(blk_seg_cnt == parent_blk_size);
if (!BLK_FINI(bs_ptr, bs1))
{
assert(t_tries < CDB_STAGNATE);
t_retry(cdb_sc_blkmod);
return RETRY_SWAP;
}
t_write(&dir_hist_ptr->h[parent_blk_lvl], (unsigned char *)bs1, 0, 0, parent_blk_lvl, FALSE, TRUE, GDS_WRITE_KILLTN);
/* To indicate later snapshot file writing process during fast_integ not to skip writing the block to snapshot file */
BIT_SET_DIR_TREE(cw_set[cw_set_depth-1].blk_prior_state);
/* 3. Free block's corresponding bitmap reflects above change. */
PUT_LONG(update_array_ptr, free_bit);
save_cw_set_depth = cw_set_depth; /* Bit maps go on end of cw_set (more fake acquired) */
assert(!cw_map_depth);
t_write_map(&bmlhist, (uchar_ptr_t)update_array_ptr, curr_tn, 1);
cw_map_depth = cw_set_depth;
cw_set_depth = save_cw_set_depth;
update_array_ptr += SIZEOF(block_id);
temp_long = 0;
PUT_LONG(update_array_ptr, temp_long);
update_array_ptr += SIZEOF(block_id);
assert(1 == cw_set[cw_map_depth - 1].reference_cnt);
/* 4. Child block gets marked recycled in bitmap. (GVCST_BMP_MARK_FREE) */
kill_set_list->blk[kill_set_list->used].flag = 0;
kill_set_list->blk[kill_set_list->used].level = 0;
kill_set_list->blk[kill_set_list->used++].block = child_blk_id;
return free_blk_id;
}
enum cdb_sc gvcst_kill_blk(srch_blk_status *blkhist,
char level,
gv_key *search_key,
srch_rec_status low,
srch_rec_status high,
boolean_t right_extra,
cw_set_element **cseptr)
{
typedef sm_uc_ptr_t bytptr;
unsigned short temp_ushort;
int4 temp_long;
int tmp_cmpc;
int blk_size, blk_seg_cnt, lmatch, rmatch, targ_len, prev_len, targ_base, next_rec_shrink,
temp_int, blkseglen;
bool kill_root, first_copy;
blk_hdr_ptr_t old_blk_hdr;
rec_hdr_ptr_t left_ptr; /*pointer to record before first record to delete*/
rec_hdr_ptr_t del_ptr; /*pointer to first record to delete*/
rec_hdr_ptr_t right_ptr; /*pointer to record after last record to delete*/
rec_hdr_ptr_t right_prev_ptr;
rec_hdr_ptr_t rp, rp1; /*scratch record pointer*/
rec_hdr_ptr_t first_in_blk, top_of_block, new_rec_hdr, star_rec_hdr;
blk_segment *bs1, *bs_ptr;
block_index new_block_index;
unsigned char *skb;
static readonly block_id zeroes = 0;
cw_set_element *cse, *old_cse;
bytptr curr, prev, right_bytptr;
off_chain chain1, curr_chain, prev_chain;
block_id blk;
sm_uc_ptr_t buffer;
srch_blk_status *t1;
*cseptr = NULL;
if (low.offset == high.offset)
return cdb_sc_normal;
blk = blkhist->blk_num;
if (dollar_tlevel)
{
PUT_LONG(&chain1, blk);
if ((1 == chain1.flag) && ((int)chain1.cw_index >= sgm_info_ptr->cw_set_depth))
{
assert(sgm_info_ptr->tp_csa == cs_addrs);
assert(FALSE == cs_addrs->now_crit);
return cdb_sc_blknumerr;
}
}
buffer = blkhist->buffaddr;
old_blk_hdr = (blk_hdr_ptr_t)buffer;
kill_root = FALSE;
blk_size = cs_data->blk_size;
first_in_blk = (rec_hdr_ptr_t)((bytptr)old_blk_hdr + SIZEOF(blk_hdr));
top_of_block = (rec_hdr_ptr_t)((bytptr)old_blk_hdr + old_blk_hdr->bsiz);
left_ptr = (rec_hdr_ptr_t)((bytptr)old_blk_hdr + low.offset);
right_ptr = (rec_hdr_ptr_t)((bytptr)old_blk_hdr + high.offset);
if (right_extra && right_ptr < top_of_block)
{
right_prev_ptr = right_ptr;
GET_USHORT(temp_ushort, &right_ptr->rsiz);
right_ptr = (rec_hdr_ptr_t)((bytptr)right_ptr + temp_ushort);
}
if ((bytptr)left_ptr < (bytptr)old_blk_hdr ||
(bytptr)right_ptr > (bytptr)top_of_block ||
(bytptr)left_ptr >= (bytptr)right_ptr)
{
assert(CDB_STAGNATE > t_tries);
return cdb_sc_rmisalign;
}
if ((bytptr)left_ptr == (bytptr)old_blk_hdr)
{
if ((bytptr)right_ptr == (bytptr)top_of_block)
{
if ((bytptr)first_in_blk == (bytptr)top_of_block)
{
if (0 != level)
{
assert(CDB_STAGNATE > t_tries);
return cdb_sc_rmisalign;
}
return cdb_sc_normal;
}
if (!gv_target->hist.h[level + 1].blk_num)
kill_root = TRUE;
else
{ /* We are about to free up the contents of this entire block. If this block corresponded to
* a global that has NOISOLATION turned on and has a non-zero recompute list (i.e. some SETs
* already happened in this same TP transaction), make sure we disable the NOISOLATION
* optimization in this case as that is applicable only if one or more SETs happened in this
* data block and NOT if a KILL happens. Usually this is done by a t_write(GDS_WRITE_KILLTN)
* call but since in this case the entire block is being freed, "t_write" wont be invoked
* so we need to explicitly set GDS_WRITE_KILLTN like t_write would have (GTM-8269).
* Note: blkhist->first_tp_srch_status is not reliable outside of TP. Thankfully the recompute
* list is also maintained only in case of TP so a check of dollar_tlevel is enough to
* dereference both "first_tp_srch_status" and "recompute_list_head".
*/
if (dollar_tlevel)
{
t1 = blkhist->first_tp_srch_status ? blkhist->first_tp_srch_status : blkhist;
cse = t1->cse;
if ((NULL != cse) && cse->recompute_list_head)
cse->write_type |= GDS_WRITE_KILLTN;
}
return cdb_sc_delete_parent;
}
}
del_ptr = first_in_blk;
} else
{
GET_USHORT(temp_ushort, &left_ptr->rsiz);
del_ptr = (rec_hdr_ptr_t)((bytptr)left_ptr + temp_ushort);
if ((bytptr)del_ptr <= (bytptr)(left_ptr + 1) || (bytptr)del_ptr > (bytptr)right_ptr)
{
assert(CDB_STAGNATE > t_tries);
return cdb_sc_rmisalign;
}
}
if ((bytptr)del_ptr == (bytptr)right_ptr)
return cdb_sc_normal;
lmatch = low.match;
rmatch = high.match;
if (level)
{
for (rp = del_ptr ; rp < right_ptr ; rp = rp1)
{
GET_USHORT(temp_ushort, &rp->rsiz);
rp1 = (rec_hdr_ptr_t)((bytptr)rp + temp_ushort);
if (((bytptr)rp1 < (bytptr)(rp + 1) + SIZEOF(block_id)) ||
((bytptr)rp1 < buffer) || ((bytptr)rp1 > (buffer + blk_size)))
{
assert(CDB_STAGNATE > t_tries);
return cdb_sc_rmisalign;
}
GET_LONG(temp_long, ((bytptr)rp1 - SIZEOF(block_id)));
if (dollar_tlevel)
{
chain1 = *(off_chain *)&temp_long;
if ((1 == chain1.flag) && ((int)chain1.cw_index >= sgm_info_ptr->cw_set_depth))
{
assert(sgm_info_ptr->tp_csa == cs_addrs);
assert(FALSE == cs_addrs->now_crit);
return cdb_sc_blknumerr;
}
}
gvcst_delete_blk(temp_long, level - 1, FALSE);
}
}
if (kill_root)
{ /* create an empty data block */
BLK_INIT(bs_ptr, bs1);
if (!BLK_FINI(bs_ptr, bs1))
{
assert(CDB_STAGNATE > t_tries);
return cdb_sc_mkblk;
}
new_block_index = t_create(blk, (uchar_ptr_t)bs1, 0, 0, 0);
/* create index block */
BLK_ADDR(new_rec_hdr, SIZEOF(rec_hdr), rec_hdr);
new_rec_hdr->rsiz = SIZEOF(rec_hdr) + SIZEOF(block_id);
SET_CMPC(new_rec_hdr, 0);
BLK_INIT(bs_ptr, bs1);
BLK_SEG(bs_ptr, (bytptr)new_rec_hdr, SIZEOF(rec_hdr));
BLK_SEG(bs_ptr, (bytptr)&zeroes, SIZEOF(block_id));
if (!BLK_FINI(bs_ptr, bs1))
{
assert(CDB_STAGNATE > t_tries);
return cdb_sc_mkblk;
}
cse = t_write(blkhist, (unsigned char *)bs1, SIZEOF(blk_hdr) + SIZEOF(rec_hdr), new_block_index, 1,
TRUE, FALSE, GDS_WRITE_KILLTN);
assert(!dollar_tlevel || !cse->high_tlevel);
*cseptr = cse;
if (NULL != cse)
cse->first_off = 0;
return cdb_sc_normal;
}
next_rec_shrink = (int)(old_blk_hdr->bsiz + ((bytptr)del_ptr - (bytptr)right_ptr));
if (SIZEOF(blk_hdr) >= next_rec_shrink)
{
assert(CDB_STAGNATE > t_tries);
return cdb_sc_rmisalign;
}
if ((bytptr)right_ptr == (bytptr)top_of_block)
{
if (level)
{
GET_USHORT(temp_ushort, &left_ptr->rsiz);
next_rec_shrink += SIZEOF(rec_hdr) + SIZEOF(block_id) - temp_ushort;
}
} else
{
targ_base = (rmatch < lmatch) ? rmatch : lmatch;
prev_len = 0;
if (right_extra)
{
EVAL_CMPC2(right_prev_ptr, tmp_cmpc);
targ_len = tmp_cmpc - targ_base;
if (targ_len < 0)
targ_len = 0;
temp_int = tmp_cmpc - EVAL_CMPC(right_ptr);
if (0 >= temp_int)
prev_len = - temp_int;
else
{
if (temp_int < targ_len)
targ_len -= temp_int;
else
targ_len = 0;
}
} else
{
targ_len = EVAL_CMPC(right_ptr) - targ_base;
if (targ_len < 0)
targ_len = 0;
}
next_rec_shrink += targ_len + prev_len;
}
BLK_INIT(bs_ptr, bs1);
first_copy = TRUE;
blkseglen = (int)((bytptr)del_ptr - (bytptr)first_in_blk);
if (0 < blkseglen)
{
if (((bytptr)right_ptr != (bytptr)top_of_block) || (0 == level))
{
BLK_SEG(bs_ptr, (bytptr)first_in_blk, blkseglen);
first_copy = FALSE;
} else
{
blkseglen = (int)((bytptr)left_ptr - (bytptr)first_in_blk);
if (0 < blkseglen)
{
BLK_SEG(bs_ptr, (bytptr)first_in_blk, blkseglen);
first_copy = FALSE;
}
BLK_ADDR(star_rec_hdr, SIZEOF(rec_hdr), rec_hdr);
SET_CMPC(star_rec_hdr, 0);
star_rec_hdr->rsiz = (unsigned short)(SIZEOF(rec_hdr) + SIZEOF(block_id));
BLK_SEG(bs_ptr, (bytptr)star_rec_hdr, SIZEOF(rec_hdr));
GET_USHORT(temp_ushort, &left_ptr->rsiz);
BLK_SEG(bs_ptr, ((bytptr)left_ptr + temp_ushort - SIZEOF(block_id)), SIZEOF(block_id));
}
}
blkseglen = (int)((bytptr)top_of_block - (bytptr)right_ptr);
assert(0 <= blkseglen);
if (0 != blkseglen)
{
next_rec_shrink = targ_len + prev_len;
if (0 >= next_rec_shrink)
{
BLK_SEG(bs_ptr, (bytptr)right_ptr, blkseglen);
} else
{
BLK_ADDR(new_rec_hdr, SIZEOF(rec_hdr), rec_hdr);
SET_CMPC(new_rec_hdr, EVAL_CMPC(right_ptr) - next_rec_shrink);
GET_USHORT(temp_ushort, &right_ptr->rsiz);
new_rec_hdr->rsiz = temp_ushort + next_rec_shrink;
BLK_SEG(bs_ptr, (bytptr)new_rec_hdr, SIZEOF(rec_hdr));
if (targ_len)
{
BLK_ADDR(skb, targ_len, unsigned char);
memcpy(skb, &search_key->base[targ_base], targ_len);
BLK_SEG(bs_ptr, skb, targ_len);
}
if (prev_len)
BLK_SEG(bs_ptr, (bytptr)(right_prev_ptr + 1) , prev_len);
right_bytptr = (bytptr)(right_ptr + 1);
blkseglen = (int)((bytptr)top_of_block - right_bytptr);
if (0 < blkseglen)
{
BLK_SEG(bs_ptr, right_bytptr, blkseglen);
} else
{
assert(CDB_STAGNATE > t_tries);
return cdb_sc_rmisalign;
}
}
}
if (!BLK_FINI(bs_ptr, bs1))
{
assert(CDB_STAGNATE > t_tries);
return cdb_sc_mkblk;
}
cse = t_write(blkhist, (unsigned char *)bs1, 0, 0, level, first_copy, TRUE, GDS_WRITE_KILLTN);
assert(!dollar_tlevel || !cse->high_tlevel);
*cseptr = cse;
if (horiz_growth)
{
old_cse = cse->low_tlevel;
assert(old_cse && old_cse->done);
assert(2 == (SIZEOF(old_cse->undo_offset) / SIZEOF(old_cse->undo_offset[0])));
assert(2 == (SIZEOF(old_cse->undo_next_off) / SIZEOF(old_cse->undo_next_off[0])));
assert(!old_cse->undo_next_off[0] && !old_cse->undo_offset[0]);
assert(!old_cse->undo_next_off[1] && !old_cse->undo_offset[1]);
}
if ((NULL != cse) && (0 != cse->first_off))
{ /* fix up chains in the block to account for deleted records */
prev = NULL;
curr = buffer + cse->first_off;
GET_LONGP(&curr_chain, curr);
while (curr < (bytptr)del_ptr)
{ /* follow chain to first deleted record */
if (0 == curr_chain.next_off)
break;
if (right_ptr == top_of_block && (bytptr)del_ptr - curr == SIZEOF(off_chain))
break; /* special case described below: stop just before the first deleted record */
prev = curr;
curr += curr_chain.next_off;
GET_LONGP(&curr_chain, curr);
}
if (right_ptr == top_of_block && (bytptr)del_ptr - curr == SIZEOF(off_chain))
{
/* if the right side of the block is gone and our last chain is in the last record,
* terminate the chain and adjust the previous entry to point at the new *-key
* NOTE: this assumes there's NEVER a TP delete of records in the GVT
*/
assert(0 != level);
/* store next_off in old_cse before actually changing it in the buffer(for rolling back) */
if (horiz_growth)
{
old_cse->undo_next_off[0] = curr_chain.next_off;
old_cse->undo_offset[0] = (block_offset)(curr - buffer);
assert(old_cse->undo_offset[0]);
}
curr_chain.next_off = 0;
GET_LONGP(curr, &curr_chain);
if (NULL != prev)
{ /* adjust previous chain next_off to reflect the fact that the record it refers to is now a *-key */
GET_LONGP(&prev_chain, prev);
/* store next_off in old_cse before actually changing it in the buffer(for rolling back) */
if (horiz_growth)
{
old_cse->undo_next_off[1] = prev_chain.next_off;
old_cse->undo_offset[1] = (block_offset)(prev - buffer);
assert(old_cse->undo_offset[1]);
}
prev_chain.next_off = (unsigned int)((bytptr)left_ptr - prev + (unsigned int)(SIZEOF(rec_hdr)));
GET_LONGP(prev, &prev_chain);
} else /* it's the first (and only) one */
cse->first_off = (block_offset)((bytptr)left_ptr - buffer + SIZEOF(rec_hdr));
} else if (curr >= (bytptr)del_ptr)
{ /* may be more records on the right that aren't deleted */
while (curr < (bytptr)right_ptr)
{ /* follow chain past last deleted record */
if (0 == curr_chain.next_off)
break;
curr += curr_chain.next_off;
GET_LONGP(&curr_chain, curr);
}
/* prev : ptr to chain record immediately preceding the deleted area,
* or 0 if none.
*
* curr : ptr to chain record immediately following the deleted area,
* or to last chain record.
*/
if (curr < (bytptr)right_ptr)
{ /* the former end of the chain is going, going, gone */
if (NULL != prev)
{ /* terminate the chain before the delete */
GET_LONGP(&prev_chain, prev);
/* store next_off in old_cse before actually changing it in the buffer(for rolling back) */
if (horiz_growth)
{
old_cse->undo_next_off[0] = prev_chain.next_off;
old_cse->undo_offset[0] = (block_offset)(prev - buffer);
assert(old_cse->undo_offset[0]);
}
prev_chain.next_off = 0;
GET_LONGP(prev, &prev_chain);
} else
cse->first_off = 0; /* the whole chain is gone */
} else
{ /* stitch up the left and right to account for the hole in the middle */
/* next_rec_shrink is the change in record size due to the new compression count */
if (NULL != prev)
{
GET_LONGP(&prev_chain, prev);
/* ??? new compression may be less (ie +) so why are negative shrinks ignored? */
/* store next_off in old_cse before actually changing it in the buffer(for rolling back) */
if (horiz_growth)
{
old_cse->undo_next_off[0] = prev_chain.next_off;
old_cse->undo_offset[0] = (block_offset)(prev - buffer);
assert(old_cse->undo_offset[0]);
}
prev_chain.next_off = (unsigned int)(curr - prev - ((bytptr)right_ptr - (bytptr)del_ptr)
+ (next_rec_shrink > 0 ? next_rec_shrink : 0));
GET_LONGP(prev, &prev_chain);
} else /* curr remains first: adjust the head */
cse->first_off = (block_offset)(curr - buffer - ((bytptr)right_ptr - (bytptr)del_ptr)
+ (next_rec_shrink > 0 ? next_rec_shrink : 0));
}
}
}
horiz_growth = FALSE;
return cdb_sc_normal;
}
void gvcst_delete_blk(block_id blk, int level, boolean_t committed)
{
cw_set_element *cse, *old_cse;
kill_set *ks;
off_chain chain;
srch_blk_status *tp_srch_status;
uint4 dummy, iter;
/* an assert to verify the validity of the block number was removed
* because it could be triggered by a concurrency conflict
*/
horiz_growth = FALSE;
if (dollar_tlevel == 0)
ks = kill_set_tail;
else
{
PUT_LONG(&chain, blk);
tp_srch_status = NULL;
if (chain.flag == 1)
tp_get_cw(sgm_info_ptr->first_cw_set, (int)chain.cw_index, &cse);
else
{
tp_srch_status = (srch_blk_status *)lookup_hashtab_ent(sgm_info_ptr->blks_in_use,
(void *)blk, &dummy);
cse = tp_srch_status ? tp_srch_status->ptr : NULL;
}
assert(!cse || !cse->high_tlevel);
if (cse)
{
if (!committed)
{
assert(dollar_tlevel >= cse->t_level);
if (cse->t_level != dollar_tlevel)
{
/* this part of the code is almost similar to that in t_write(),
* any changes in one should be reflected in the other */
horiz_growth = TRUE;
old_cse = cse;
cse = (cw_set_element *)get_new_free_element(sgm_info_ptr->tlvl_cw_set_list);
memcpy(cse, old_cse, sizeof(cw_set_element));
cse->low_tlevel = old_cse;
cse->high_tlevel = NULL;
old_cse->high_tlevel = cse;
cse->t_level = dollar_tlevel;
assert(2 == (sizeof(cse->undo_offset) / sizeof(cse->undo_offset[0])));
assert(2 == (sizeof(cse->undo_next_off) / sizeof(cse->undo_next_off[0])));
for (iter = 0; iter < 2; iter++)
cse->undo_next_off[iter] = cse->undo_offset[iter] = 0;
if (!old_cse->new_buff) /* it's possible to arrive here with an unbuilt block */
gvcst_blk_build(old_cse, (uchar_ptr_t)old_cse->new_buff, 0);
old_cse->done = TRUE;
cse->new_buff = ((new_buff_buddy_list *)
get_new_free_element(sgm_info_ptr->new_buff_list))->new_buff;
memcpy(cse->new_buff, old_cse->new_buff, ((blk_hdr_ptr_t)old_cse->new_buff)->bsiz);
/* tp_srch_status->ptr has to be updated here, since gvcst_kill() does
* not call tp_hist() at the end as in gvcst_put_blk() */
if (tp_srch_status)
tp_srch_status->ptr = (void *)cse;
}
switch (cse->mode)
{
case gds_t_create:
cse->mode = kill_t_create;
if (level == 0)
return;
break;
case gds_t_write:
cse->mode = kill_t_write;
break;
default:
;
}
} else
{
switch(cse->mode)
{
case kill_t_create:
if (level == 0)
return;
break;
default:
if (chain.flag)
{
chain.flag = 0;
blk = cse->blk;
}
break;
}
}
}
ks = sgm_info_ptr->kill_set_tail;
if (NULL == ks) /* Allocate first kill set to sgm_info_ptr block */
{
ks = sgm_info_ptr->kill_set_tail = sgm_info_ptr->kill_set_head = (kill_set *)malloc(sizeof(kill_set));
ks->used = 0;
ks->next_kill_set = NULL;
}
}
while (ks->used >= BLKS_IN_KILL_SET)
{
if (ks->next_kill_set == NULL)
{
ks->next_kill_set = (kill_set *)malloc(sizeof(kill_set));
ks->next_kill_set->used = 0;
ks->next_kill_set->next_kill_set = NULL;
}
ks = kill_set_tail
= ks->next_kill_set;
}
ks->blk[ks->used].level = level;
if (dollar_tlevel == 0 || chain.flag == 0)
{
ks->blk[ks->used].block = blk;
ks->blk[ks->used].flag = 0;
} else
{
ks->blk[ks->used].block = chain.cw_index;
ks->blk[ks->used].flag = chain.flag;
}
++ks->used;
assert(ks->used <= BLKS_IN_KILL_SET);
}
/******************************************************************************************
Input Parameters:
level: level of working block
dest_blk_id: last destination used for swap
Output Parameters:
kill_set_ptr: Kill set to be freed
*exclude_glist_ptr: List of globals not to be moved for a swap destination
Input/Output Parameters:
gv_target : as working block's history
reorg_gv_target->hist : as desitnitions block's history
******************************************************************************************/
enum cdb_sc mu_swap_blk(int level, block_id *pdest_blk_id, kill_set *kill_set_ptr, glist *exclude_glist_ptr)
{
unsigned char x_blk_lmap;
unsigned short temp_ushort;
int rec_size1, rec_size2;
int wlevel, nslevel, dest_blk_level;
int piece_len1, piece_len2, first_offset, second_offset,
work_blk_size, work_parent_size, dest_blk_size, dest_parent_size;
int dest_child_cycle;
int blk_seg_cnt, blk_size;
trans_num ctn;
int key_len, key_len_dir;
block_id dest_blk_id, work_blk_id, child1, child2;
enum cdb_sc status;
srch_hist *dest_hist_ptr, *dir_hist_ptr;
cache_rec_ptr_t dest_child_cr;
blk_segment *bs1, *bs_ptr;
sm_uc_ptr_t saved_blk, work_blk_ptr, work_parent_ptr, dest_parent_ptr, dest_blk_ptr,
bn_ptr, bmp_buff, tblk_ptr, rec_base, rPtr1;
boolean_t gbl_target_was_set, blk_was_free, deleted;
gv_namehead *save_targ;
srch_blk_status bmlhist, destblkhist, *hist_ptr;
unsigned char save_cw_set_depth;
cw_set_element *tmpcse;
jnl_buffer_ptr_t jbbp; /* jbbp is non-NULL only if before-image journaling */
unsigned int bsiz;
DCL_THREADGBL_ACCESS;
SETUP_THREADGBL_ACCESS;
dest_blk_id = *pdest_blk_id;
CHECK_AND_RESET_UPDATE_ARRAY; /* reset update_array_ptr to update_array */
if (NULL == TREF(gv_reorgkey))
GVKEY_INIT(TREF(gv_reorgkey), DBKEYSIZE(MAX_KEY_SZ));
dest_hist_ptr = &(reorg_gv_target->hist);
dir_hist_ptr = reorg_gv_target->alt_hist;
blk_size = cs_data->blk_size;
work_parent_ptr = gv_target->hist.h[level+1].buffaddr;
work_parent_size = ((blk_hdr_ptr_t)work_parent_ptr)->bsiz;
work_blk_ptr = gv_target->hist.h[level].buffaddr;
work_blk_size = ((blk_hdr_ptr_t)work_blk_ptr)->bsiz;
work_blk_id = gv_target->hist.h[level].blk_num;
if (blk_size < work_blk_size)
{
assert(t_tries < CDB_STAGNATE);
return cdb_sc_blkmod;
}
cws_reorg_remove_index = 0;
/*===== Infinite loop to find the destination block =====*/
for ( ; ; )
{
blk_was_free = FALSE;
INCR_BLK_NUM(dest_blk_id);
/* A Pre-order traversal should not cause a child block to go to its parent.
* However, in case it happens because already the organization was like that or for any other reason, skip swap.
* If we decide to swap, code below should be changed to take care of the special case.
* Still a grand-child can go to its grand-parent. This is rare and following code can handle it.
*/
if (dest_blk_id == gv_target->hist.h[level+1].blk_num)
continue;
if (cs_data->trans_hist.total_blks <= dest_blk_id || dest_blk_id == work_blk_id)
{
*pdest_blk_id = dest_blk_id;
return cdb_sc_oprnotneeded;
}
ctn = cs_addrs->ti->curr_tn;
/* We need to save the block numbers that were NEWLY ADDED (since entering this function "mu_swap_blk")
* through the CWS_INSERT macro (in db_csh_get/db_csh_getn which can be called by t_qread or gvcst_search below).
* This is so that we can delete these blocks from the "cw_stagnate" hashtable in case we determine the need to
* choose a different "dest_blk_id" in this for loop (i.e. come to the next iteration). If these blocks are not
* deleted, then the hashtable will keep growing (a good example will be if -EXCLUDE qualifier is specified and
* a lot of prospective dest_blk_ids get skipped because they contain EXCLUDEd global variables) and very soon
* the hashtable will contain more entries than there are global buffers and at that point db_csh_getn will not
* be able to get a free global buffer for a new block (since it checks the "cw_stagnate" hashtable before reusing
* a buffer in case of MUPIP REORG). To delete these previous iteration blocks, we use the "cws_reorg_remove_array"
* variable. This array should have enough entries to accommodate the maximum number of blocks that can be t_qread
* in one iteration down below. And that number is the sum of
* + MAX_BT_DEPTH : for the t_qread while loop down the tree done below
* + 2 * MAX_BT_DEPTH : for the two calls to gvcst_search done below
* + 2 : 1 for the t_qread of dest_blk_id and 1 more for the t_qread of a
* bitmap block done inside the call to get_lmap below
* = 3 * MAX_BT_DEPTH + 2
* To be safe, we give a buffer of MAX_BT_DEPTH elements i.e. (4 * MAX_BT_DEPTH) + 2.
* This is defined in the macro CWS_REMOVE_ARRAYSIZE in cws_insert.h
*/
/* reset whatever blocks the previous iteration of this for loop had filled in the cw_stagnate hashtable */
for ( ; cws_reorg_remove_index > 0; cws_reorg_remove_index--)
{
deleted = delete_hashtab_int4(&cw_stagnate, (uint4 *)&cws_reorg_remove_array[cws_reorg_remove_index]);
assert(deleted);
}
/* read corresponding bitmap block before attempting to read destination block.
* if bitmap indicates block is free, we will not read the destination block
*/
bmp_buff = get_lmap(dest_blk_id, &x_blk_lmap, (sm_int_ptr_t)&bmlhist.cycle, &bmlhist.cr);
if (!bmp_buff || BLK_MAPINVALID == x_blk_lmap ||
((blk_hdr_ptr_t)bmp_buff)->bsiz != BM_SIZE(BLKS_PER_LMAP) ||
((blk_hdr_ptr_t)bmp_buff)->levl != LCL_MAP_LEVL)
{
assert(CDB_STAGNATE > t_tries);
return cdb_sc_badbitmap;
}
if (BLK_FREE != x_blk_lmap)
{ /* x_blk_lmap is either BLK_BUSY or BLK_RECYCLED. In either case, we need to read destination block
* in case we later detect that the before-image needs to be written.
*/
if (!(dest_blk_ptr = t_qread(dest_blk_id, (sm_int_ptr_t)&destblkhist.cycle, &destblkhist.cr)))
{
assert(t_tries < CDB_STAGNATE);
return (enum cdb_sc)rdfail_detail;
}
destblkhist.blk_num = dest_blk_id;
destblkhist.buffaddr = dest_blk_ptr;
destblkhist.level = dest_blk_level = ((blk_hdr_ptr_t)dest_blk_ptr)->levl;
}
if (BLK_BUSY != x_blk_lmap)
{ /* x_blk_map is either BLK_FREE or BLK_RECYCLED both of which mean the block is not used in the bitmap */
blk_was_free = TRUE;
break;
}
/* dest_blk_id might contain a *-record only.
* So follow the pointer to go to the data/index block, which has a non-* key to search.
*/
nslevel = dest_blk_level;
if (MAX_BT_DEPTH <= nslevel)
{
assert(CDB_STAGNATE > t_tries);
return cdb_sc_maxlvl;
}
rec_base = dest_blk_ptr + SIZEOF(blk_hdr);
GET_RSIZ(rec_size1, rec_base);
tblk_ptr = dest_blk_ptr;
while ((BSTAR_REC_SIZE == rec_size1) && (0 != nslevel))
{
GET_LONG(child1, (rec_base + SIZEOF(rec_hdr)));
if (0 == child1 || child1 > cs_data->trans_hist.total_blks - 1)
{
assert(t_tries < CDB_STAGNATE);
return cdb_sc_rdfail;
}
if (!(tblk_ptr = t_qread(child1, (sm_int_ptr_t)&dest_child_cycle, &dest_child_cr)))
{
assert(t_tries < CDB_STAGNATE);
return (enum cdb_sc)rdfail_detail;
}
/* leaf of a killed GVT can have block header only. Skip those blocks */
if (SIZEOF(blk_hdr) >= ((blk_hdr_ptr_t)tblk_ptr)->bsiz)
break;
nslevel--;
rec_base = tblk_ptr + SIZEOF(blk_hdr);
GET_RSIZ(rec_size1, rec_base);
}
/* leaf of a killed GVT can have block header only. Skip those blocks */
if (SIZEOF(blk_hdr) >= ((blk_hdr_ptr_t)tblk_ptr)->bsiz)
continue;
/* get length of global variable name (do not read subscript) for dest_blk_id */
GET_GBLNAME_LEN(key_len_dir, rec_base + SIZEOF(rec_hdr));
/* key_len = length of 1st key value (including subscript) for dest_blk_id */
GET_KEY_LEN(key_len, rec_base + SIZEOF(rec_hdr));
if ((1 >= key_len_dir || MAX_MIDENT_LEN + 1 < key_len_dir) || (2 >= key_len || MAX_KEY_SZ < key_len))
{ /* Earlier used to restart here always. But dest_blk_id can be a block,
* which is just killed and still marked busy. Skip it, if we are in last retry.
*/
if (CDB_STAGNATE <= t_tries)
continue;
else
return cdb_sc_blkmod;
}
memcpy(&((TREF(gv_reorgkey))->base[0]), rec_base + SIZEOF(rec_hdr), key_len_dir);
(TREF(gv_reorgkey))->base[key_len_dir] = 0;
(TREF(gv_reorgkey))->end = key_len_dir;
if (exclude_glist_ptr->next)
{ /* exclude blocks for globals in the list of EXCLUDE option */
if (in_exclude_list(&((TREF(gv_reorgkey))->base[0]), key_len_dir - 1, exclude_glist_ptr))
continue;
}
save_targ = gv_target;
if (INVALID_GV_TARGET != reset_gv_target)
gbl_target_was_set = TRUE;
else
{
gbl_target_was_set = FALSE;
reset_gv_target = save_targ;
}
gv_target = reorg_gv_target;
gv_target->root = cs_addrs->dir_tree->root;
gv_target->clue.end = 0;
/* assign Directory tree path to find dest_blk_id in dir_hist_ptr */
status = gvcst_search(TREF(gv_reorgkey), dir_hist_ptr);
if (cdb_sc_normal != status)
{
assert(t_tries < CDB_STAGNATE);
RESET_GV_TARGET_LCL_AND_CLR_GBL(save_targ, DO_GVT_GVKEY_CHECK);
return status;
}
if (dir_hist_ptr->h[0].curr_rec.match != (TREF(gv_reorgkey))->end + 1)
{ /* may be in a kill_set of another process */
RESET_GV_TARGET_LCL_AND_CLR_GBL(save_targ, DO_GVT_GVKEY_CHECK);
continue;
}
for (wlevel = 0; wlevel <= dir_hist_ptr->depth &&
dir_hist_ptr->h[wlevel].blk_num != dest_blk_id; wlevel++);
if (dir_hist_ptr->h[wlevel].blk_num == dest_blk_id)
{ /* do not swap a dir_tree block */
RESET_GV_TARGET_LCL_AND_CLR_GBL(save_targ, DO_GVT_GVKEY_CHECK);
continue;
}
/* gv_reorgkey will now have the first key from dest_blk_id,
* or, from a descendant of dest_blk_id (in case it had a *-key only).
*/
memcpy(&((TREF(gv_reorgkey))->base[0]), rec_base + SIZEOF(rec_hdr), key_len);
(TREF(gv_reorgkey))->end = key_len - 1;
GET_KEY_LEN(key_len_dir, dir_hist_ptr->h[0].buffaddr + dir_hist_ptr->h[0].curr_rec.offset + SIZEOF(rec_hdr));
/* Get root of GVT for dest_blk_id */
GET_LONG(gv_target->root,
dir_hist_ptr->h[0].buffaddr + dir_hist_ptr->h[0].curr_rec.offset + SIZEOF(rec_hdr) + key_len_dir);
if ((0 == gv_target->root) || (gv_target->root > (cs_data->trans_hist.total_blks - 1)))
{
assert(t_tries < CDB_STAGNATE);
RESET_GV_TARGET_LCL_AND_CLR_GBL(save_targ, DO_GVT_GVKEY_CHECK);
return cdb_sc_blkmod;
}
/* Assign Global Variable Tree path to find dest_blk_id in dest_hist_ptr */
gv_target->clue.end = 0;
status = gvcst_search(TREF(gv_reorgkey), dest_hist_ptr);
RESET_GV_TARGET_LCL_AND_CLR_GBL(save_targ, DO_GVT_GVKEY_CHECK);
if (dest_blk_level >= dest_hist_ptr->depth || /* do not swap in root level */
dest_hist_ptr->h[dest_blk_level].blk_num != dest_blk_id) /* must be in a kill set of another process. */
continue;
if ((cdb_sc_normal != status) || (dest_hist_ptr->h[nslevel].curr_rec.match != ((TREF(gv_reorgkey))->end + 1)))
{
assert(t_tries < CDB_STAGNATE);
return (cdb_sc_normal != status ? status : cdb_sc_blkmod);
}
for (wlevel = nslevel; wlevel <= dest_blk_level; wlevel++)
dest_hist_ptr->h[wlevel].tn = ctn;
dest_blk_ptr = dest_hist_ptr->h[dest_blk_level].buffaddr;
dest_blk_size = ((blk_hdr_ptr_t)dest_blk_ptr)->bsiz;
dest_parent_ptr = dest_hist_ptr->h[dest_blk_level+1].buffaddr;
dest_parent_size = ((blk_hdr_ptr_t)dest_parent_ptr)->bsiz;
break;
}
/*===== End of infinite loop to find the destination block =====*/
/*-----------------------------------------------------
Now modify blocks for swapping. Maximum of 4 blocks.
-----------------------------------------------------*/
if (!blk_was_free)
{ /* 1: dest_blk_id into work_blk_id */
BLK_INIT(bs_ptr, bs1);
BLK_SEG(bs_ptr, dest_blk_ptr + SIZEOF(blk_hdr), dest_blk_size - SIZEOF(blk_hdr));
if (!BLK_FINI (bs_ptr,bs1))
{
assert(t_tries < CDB_STAGNATE);
return cdb_sc_blkmod;
}
assert(gv_target->hist.h[level].blk_num == work_blk_id);
assert(gv_target->hist.h[level].buffaddr == work_blk_ptr);
t_write(&gv_target->hist.h[level], (unsigned char *)bs1, 0, 0, dest_blk_level, TRUE, TRUE, GDS_WRITE_KILLTN);
}
/* 2: work_blk_id into dest_blk_id */
if (!blk_was_free && work_blk_id == dest_hist_ptr->h[dest_blk_level+1].blk_num)
{ /* work_blk_id will be swapped with its child.
* This is the only vertical swap. Here working block goes to its child.
* Working block cannot goto its parent because of traversal
*/
if (dest_blk_level + 1 != level || dest_parent_size != work_blk_size)
{
assert(t_tries < CDB_STAGNATE);
return cdb_sc_blkmod;
}
BLK_INIT(bs_ptr, bs1);
BLK_ADDR(saved_blk, dest_parent_size, unsigned char);
memcpy(saved_blk, dest_parent_ptr, dest_parent_size);
first_offset = dest_hist_ptr->h[dest_blk_level+1].curr_rec.offset;
GET_RSIZ(rec_size1, saved_blk + first_offset);
if (work_blk_size < first_offset + rec_size1)
{
assert(t_tries < CDB_STAGNATE);
return cdb_sc_blkmod;
}
piece_len1 = first_offset + rec_size1;
BLK_SEG(bs_ptr, saved_blk + SIZEOF(blk_hdr), piece_len1 - SIZEOF(block_id) - SIZEOF(blk_hdr));
BLK_ADDR(bn_ptr, SIZEOF(block_id), unsigned char);
PUT_LONG(bn_ptr, work_blk_id); /* since work_blk_id will now be the child of dest_blk_id */
BLK_SEG(bs_ptr, bn_ptr, SIZEOF(block_id));
BLK_SEG(bs_ptr, saved_blk + piece_len1, dest_parent_size - piece_len1);
if (!BLK_FINI(bs_ptr, bs1))
{
assert(t_tries < CDB_STAGNATE);
return cdb_sc_blkmod;
}
assert(dest_blk_id == dest_hist_ptr->h[dest_blk_level].blk_num);
assert(dest_blk_ptr == dest_hist_ptr->h[dest_blk_level].buffaddr);
t_write(&dest_hist_ptr->h[dest_blk_level], (unsigned char *)bs1, 0, 0, level, TRUE, TRUE, GDS_WRITE_KILLTN);
} else /* free block or, when working block does not move vertically (swap with parent/child) */
{
BLK_INIT(bs_ptr, bs1);
BLK_ADDR(saved_blk, work_blk_size, unsigned char);
memcpy(saved_blk, work_blk_ptr, work_blk_size);
BLK_SEG(bs_ptr, saved_blk + SIZEOF(blk_hdr), work_blk_size - SIZEOF(blk_hdr));
if (!BLK_FINI(bs_ptr, bs1))
{
assert(t_tries < CDB_STAGNATE);
return cdb_sc_blkmod;
}
if (blk_was_free)
{
tmpcse = &cw_set[cw_set_depth];
t_create(dest_blk_id, (unsigned char *)bs1, 0, 0, level);
/* Although we invoked t_create, we do not want t_end to allocate the block (i.e. change mode
* from gds_t_create to gds_t_acquired). Instead we do that and a little more (that t_end does) all here.
*/
assert(dest_blk_id == tmpcse->blk);
tmpcse->mode = gds_t_acquired;
/* If snapshots are in progress, we might want to read the before images of the FREE blocks also.
* Since mu_swap_blk mimics a small part of t_end, it sets cse->mode to gds_t_acquired and hence
* will not read the before images of the FREE blocks in t_end. To workaround this, set
* cse->was_free to TRUE so that in t_end, this condition can be used to read the before images of
* the FREE blocks if needed.
*/
(BLK_FREE == x_blk_lmap) ? SET_FREE(tmpcse) : SET_NFREE(tmpcse);
/* No need to write before-image in case the block is FREE. In case the database had never been fully
* upgraded from V4 to V5 format (after the MUPIP UPGRADE), all RECYCLED blocks can basically be considered
* FREE (i.e. no need to write before-images since backward journal recovery will never be expected
* to take the database to a point BEFORE the mupip upgrade).
*/
if ((BLK_FREE == x_blk_lmap) || !cs_data->db_got_to_v5_once)
tmpcse->old_block = NULL;
else
{ /* Destination is a recycled block that needs a before image */
tmpcse->old_block = destblkhist.buffaddr;
/* Record cr,cycle. This is used later in t_end to determine if checksums need to be recomputed */
tmpcse->cr = destblkhist.cr;
tmpcse->cycle = destblkhist.cycle;
jbbp = (JNL_ENABLED(cs_addrs) && cs_addrs->jnl_before_image) ? cs_addrs->jnl->jnl_buff : NULL;
if ((NULL != jbbp) && (((blk_hdr_ptr_t)tmpcse->old_block)->tn < jbbp->epoch_tn))
{ /* Compute CHECKSUM for writing PBLK record before getting crit.
* It is possible that we are reading a block that is actually marked free in
* the bitmap (due to concurrency issues at this point). Therefore we might be
* actually reading uninitialized block headers and in turn a bad value of
* "old_block->bsiz". Restart if we ever access a buffer whose size is greater
* than the db block size.
*/
bsiz = ((blk_hdr_ptr_t)(tmpcse->old_block))->bsiz;
if (bsiz > blk_size)
{
assert(CDB_STAGNATE > t_tries);
return cdb_sc_lostbmlcr;
}
JNL_GET_CHECKSUM_ACQUIRED_BLK(tmpcse, cs_data, cs_addrs, tmpcse->old_block, bsiz);
}
}
assert(GDSVCURR == tmpcse->ondsk_blkver); /* should have been set by t_create above */
} else
{
hist_ptr = &dest_hist_ptr->h[dest_blk_level];
assert(dest_blk_id == hist_ptr->blk_num);
assert(dest_blk_ptr == hist_ptr->buffaddr);
t_write(hist_ptr, (unsigned char *)bs1, 0, 0, level, TRUE, TRUE, GDS_WRITE_KILLTN);
}
}
if (!blk_was_free)
{ /* 3: Parent of destination block (may be parent of working block too) */
if (gv_target->hist.h[level+1].blk_num == dest_hist_ptr->h[dest_blk_level+1].blk_num)
{ /* dest parent == work_blk parent */
BLK_INIT(bs_ptr, bs1);
/* Interchange pointer to dest_blk_id and work_blk_id */
if (level != dest_blk_level ||
gv_target->hist.h[level+1].curr_rec.offset == dest_hist_ptr->h[level+1].curr_rec.offset)
{
assert(t_tries < CDB_STAGNATE);
return cdb_sc_blkmod;
}
if (gv_target->hist.h[level+1].curr_rec.offset < dest_hist_ptr->h[level+1].curr_rec.offset)
{
first_offset = gv_target->hist.h[level+1].curr_rec.offset;
second_offset = dest_hist_ptr->h[level+1].curr_rec.offset;
} else
{
first_offset = dest_hist_ptr->h[level+1].curr_rec.offset;
second_offset = gv_target->hist.h[level+1].curr_rec.offset;
}
GET_RSIZ(rec_size1, dest_parent_ptr + first_offset);
GET_RSIZ(rec_size2, dest_parent_ptr + second_offset);
if (dest_parent_size < first_offset + rec_size1 ||
dest_parent_size < second_offset + rec_size2 ||
BSTAR_REC_SIZE >= rec_size1 || BSTAR_REC_SIZE > rec_size2)
{
assert(t_tries < CDB_STAGNATE);
return cdb_sc_blkmod;
}
piece_len1 = first_offset + rec_size1 - SIZEOF(block_id);
piece_len2 = second_offset + rec_size2 - SIZEOF(block_id);
GET_LONG(child1, dest_parent_ptr + piece_len1);
GET_LONG(child2, dest_parent_ptr + piece_len2);
BLK_SEG(bs_ptr, dest_parent_ptr + SIZEOF(blk_hdr), piece_len1 - SIZEOF(blk_hdr));
BLK_ADDR(bn_ptr, SIZEOF(block_id), unsigned char);
PUT_LONG(bn_ptr, child2);
BLK_SEG(bs_ptr, bn_ptr, SIZEOF(block_id));
BLK_SEG(bs_ptr, dest_parent_ptr + first_offset + rec_size1,
second_offset + rec_size2 - SIZEOF(block_id) - first_offset - rec_size1);
BLK_ADDR(bn_ptr, SIZEOF(block_id), unsigned char);
PUT_LONG(bn_ptr, child1);
BLK_SEG(bs_ptr, bn_ptr, SIZEOF(block_id));
BLK_SEG(bs_ptr, dest_parent_ptr + second_offset + rec_size2,
dest_parent_size - second_offset - rec_size2);
if (!BLK_FINI(bs_ptr,bs1))
{
assert(t_tries < CDB_STAGNATE);
return cdb_sc_blkmod;
}
assert(level == dest_blk_level);
assert(dest_parent_ptr == dest_hist_ptr->h[level+1].buffaddr);
t_write(&dest_hist_ptr->h[level+1], (unsigned char *)bs1, 0, 0, level+1, FALSE, TRUE, GDS_WRITE_KILLTN);
} else if (work_blk_id != dest_hist_ptr->h[dest_blk_level+1].blk_num)
{ /* Destination block moved in the position of working block.
* So destination block's parent's pointer should be changed to work_blk_id
*/
BLK_INIT(bs_ptr, bs1);
GET_RSIZ(rec_size1, dest_parent_ptr + dest_hist_ptr->h[dest_blk_level+1].curr_rec.offset);
if (dest_parent_size < rec_size1 + dest_hist_ptr->h[dest_blk_level+1].curr_rec.offset ||
BSTAR_REC_SIZE > rec_size1)
{
assert(t_tries < CDB_STAGNATE);
return cdb_sc_blkmod;
}
BLK_SEG (bs_ptr, dest_parent_ptr + SIZEOF(blk_hdr),
dest_hist_ptr->h[dest_blk_level+1].curr_rec.offset + rec_size1 - SIZEOF(blk_hdr) - SIZEOF(block_id));
BLK_ADDR(bn_ptr, SIZEOF(block_id), unsigned char);
PUT_LONG(bn_ptr, work_blk_id);
BLK_SEG(bs_ptr, bn_ptr, SIZEOF(block_id));
BLK_SEG(bs_ptr, dest_parent_ptr + dest_hist_ptr->h[dest_blk_level+1].curr_rec.offset + rec_size1,
dest_parent_size - dest_hist_ptr->h[dest_blk_level+1].curr_rec.offset - rec_size1);
if (!BLK_FINI(bs_ptr,bs1))
{
assert(t_tries < CDB_STAGNATE);
return cdb_sc_blkmod;
}
assert(dest_parent_ptr == dest_hist_ptr->h[dest_blk_level+1].buffaddr);
t_write(&dest_hist_ptr->h[dest_blk_level+1], (unsigned char *)bs1, 0, 0, dest_blk_level+1,
FALSE, TRUE, GDS_WRITE_KILLTN);
}
}
/* 4: Parent of working block, if different than destination's parent or, destination was a free block */
if (blk_was_free || gv_target->hist.h[level+1].blk_num != dest_hist_ptr->h[dest_blk_level+1].blk_num)
{ /* Parent block of working blk should correctly point the working block. Working block went to dest_blk_id */
GET_RSIZ(rec_size1, (work_parent_ptr + gv_target->hist.h[level+1].curr_rec.offset));
if (work_parent_size < rec_size1 + gv_target->hist.h[level+1].curr_rec.offset || BSTAR_REC_SIZE > rec_size1)
{
assert(t_tries < CDB_STAGNATE);
return cdb_sc_blkmod;
}
BLK_INIT(bs_ptr, bs1);
BLK_SEG(bs_ptr, work_parent_ptr + SIZEOF(blk_hdr),
gv_target->hist.h[level+1].curr_rec.offset + rec_size1 - SIZEOF(blk_hdr) - SIZEOF(block_id));
BLK_ADDR(bn_ptr, SIZEOF(block_id), unsigned char);
PUT_LONG(bn_ptr, dest_blk_id);
BLK_SEG(bs_ptr, bn_ptr, SIZEOF(block_id));
BLK_SEG(bs_ptr, work_parent_ptr + gv_target->hist.h[level+1].curr_rec.offset + rec_size1,
work_parent_size - gv_target->hist.h[level+1].curr_rec.offset - rec_size1);
if (!BLK_FINI(bs_ptr, bs1))
{
assert(t_tries < CDB_STAGNATE);
return cdb_sc_blkmod;
}
assert(gv_target->hist.h[level+1].buffaddr == work_parent_ptr);
t_write(&gv_target->hist.h[level+1], (unsigned char *)bs1, 0, 0, level+1, FALSE, TRUE, GDS_WRITE_KILLTN);
}
/* else already taken care of, when dest_blk_id moved */
if (blk_was_free)
{ /* A free/recycled block will become busy block.
* So the local bitmap must be updated.
* Local bit map block will be added in the list of update arrray for concurrency check and
* also the cw_set element will be created to mark the free/recycled block as free.
* kill_set_ptr will save the block which will become free.
*/
child1 = ROUND_DOWN2(dest_blk_id, BLKS_PER_LMAP); /* bit map block */
bmlhist.buffaddr = bmp_buff;
bmlhist.blk_num = child1;
child1 = dest_blk_id - child1;
assert(child1);
PUT_LONG(update_array_ptr, child1);
/* Need to put bit maps on the end of the cw set for concurrency checking.
* We want to simulate t_write_map, except we want to update "cw_map_depth" instead of "cw_set_depth".
* Hence the save and restore logic (for "cw_set_depth") below.
*/
save_cw_set_depth = cw_set_depth;
assert(!cw_map_depth);
t_write_map(&bmlhist, (uchar_ptr_t)update_array_ptr, ctn, 1); /* will increment cw_set_depth */
cw_map_depth = cw_set_depth; /* set cw_map_depth to the latest cw_set_depth */
cw_set_depth = save_cw_set_depth; /* restore cw_set_depth */
/* t_write_map simulation end */
update_array_ptr += SIZEOF(block_id);
child1 = 0;
PUT_LONG(update_array_ptr, child1);
update_array_ptr += SIZEOF(block_id);
assert(1 == cw_set[cw_map_depth - 1].reference_cnt); /* 1 free block is now becoming BLK_USED in the bitmap */
/* working block will be removed */
kill_set_ptr->blk[kill_set_ptr->used].flag = 0;
kill_set_ptr->blk[kill_set_ptr->used].level = 0;
kill_set_ptr->blk[kill_set_ptr->used++].block = work_blk_id;
}
*pdest_blk_id = dest_blk_id;
return cdb_sc_normal;
}
