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Btree WAL logging.

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This commit is contained in:
Vadim B. Mikheev
2000-10-04 00:04:43 +00:00
parent 831e78e0c4
commit 5800c6b9aa
4 changed files with 223 additions and 55 deletions
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156
src/backend/access/nbtree/nbtinsert.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtinsert.c,v 1.62 2000/08/25 23:13:33 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtinsert.c,v 1.63 2000/10/04 00:04:42 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@@ -33,6 +33,7 @@ typedef struct
int best_delta; /* best size delta so far */
} FindSplitData;
void _bt_newroot(Relation rel, Buffer lbuf, Buffer rbuf);
static TransactionId _bt_check_unique(Relation rel, BTItem btitem,
Relation heapRel, Buffer buf,
@@ -54,7 +55,6 @@ static void _bt_checksplitloc(FindSplitData *state, OffsetNumber firstright,
int leftfree, int rightfree,
bool newitemonleft, Size firstrightitemsz);
static Buffer _bt_getstackbuf(Relation rel, BTStack stack);
static void _bt_newroot(Relation rel, Buffer lbuf, Buffer rbuf);
static void _bt_pgaddtup(Relation rel, Page page,
Size itemsize, BTItem btitem,
OffsetNumber itup_off, const char *where);
@@ -514,6 +514,29 @@ _bt_insertonpg(Relation rel,
}
else
{
#ifdef XLOG
/* XLOG stuff */
{
char xlbuf[sizeof(xl_btree_insert) + 2 * sizeof(CommandId)];
xl_btree_insert *xlrec = xlbuf;
int hsize = SizeOfBtreeInsert;
xlrec->target.node = rel->rd_node;
ItemPointerSet(&(xlrec->target.tid), BufferGetBlockNumber(buf), newitemoff);
if (P_ISLEAF(lpageop))
{
CommandId cid = GetCurrentCommandId();
memcpy(xlbuf + SizeOfBtreeInsert, &(char*)cid, sizeof(CommandId));
hsize += sizeof(CommandId);
}
XLogRecPtr recptr = XLogInsert(RM_BTREE_ID, XLOG_BTREE_INSERT,
xlbuf, hsize, (char*) btitem, itemsz);
PageSetLSN(page, recptr);
PageSetSUI(page, ThisStartUpID);
}
#endif
_bt_pgaddtup(rel, page, itemsz, btitem, newitemoff, "page");
itup_off = newitemoff;
itup_blkno = BufferGetBlockNumber(buf);
@@ -578,8 +601,9 @@ _bt_split(Relation rel, Buffer buf, OffsetNumber firstright,
ropaque = (BTPageOpaque) PageGetSpecialPointer(rightpage);
/* if we're splitting this page, it won't be the root when we're done */
oopaque->btpo_flags &= ~BTP_ROOT;
lopaque->btpo_flags = ropaque->btpo_flags = oopaque->btpo_flags;
lopaque->btpo_flags = oopaque->btpo_flags;
lopaque->btpo_flags &= ~BTP_ROOT;
ropaque->btpo_flags = lopaque->btpo_flags;
lopaque->btpo_prev = oopaque->btpo_prev;
lopaque->btpo_next = BufferGetBlockNumber(rbuf);
ropaque->btpo_prev = BufferGetBlockNumber(buf);
@@ -608,7 +632,7 @@ _bt_split(Relation rel, Buffer buf, OffsetNumber firstright,
item = (BTItem) PageGetItem(origpage, itemid);
if (PageAddItem(rightpage, (Item) item, itemsz, rightoff,
LP_USED) == InvalidOffsetNumber)
elog(FATAL, "btree: failed to add hikey to the right sibling");
elog(STOP, "btree: failed to add hikey to the right sibling");
rightoff = OffsetNumberNext(rightoff);
}
@@ -633,7 +657,7 @@ _bt_split(Relation rel, Buffer buf, OffsetNumber firstright,
}
if (PageAddItem(leftpage, (Item) item, itemsz, leftoff,
LP_USED) == InvalidOffsetNumber)
elog(FATAL, "btree: failed to add hikey to the left sibling");
elog(STOP, "btree: failed to add hikey to the left sibling");
leftoff = OffsetNumberNext(leftoff);
/*
@@ -704,6 +728,75 @@ _bt_split(Relation rel, Buffer buf, OffsetNumber firstright,
}
}
/*
* We have to grab the right sibling (if any) and fix the prev
* pointer there. We are guaranteed that this is deadlock-free
* since no other writer will be holding a lock on that page
* and trying to move left, and all readers release locks on a page
* before trying to fetch its neighbors.
*/
if (!P_RIGHTMOST(ropaque))
{
sbuf = _bt_getbuf(rel, ropaque->btpo_next, BT_WRITE);
spage = BufferGetPage(sbuf);
}
#ifdef XLOG
/*
* Right sibling is locked, new siblings are prepared, but original
* page is not updated yet. Log changes before continuing.
*
* NO ELOG(ERROR) till right sibling is updated.
*
*/
{
char xlbuf[sizeof(xl_btree_split) +
2 * sizeof(CommandId) + BLCKSZ];
xl_btree_split *xlrec = xlbuf;
int hsize = SizeOfBtreeSplit;
int flag = (newitemonleft) ?
XLOG_BTREE_SPLEFT : XLOG_BTREE_SPLIT;
xlrec->target.node = rel->rd_node;
ItemPointerSet(&(xlrec->target.tid), itup_blkno, itup_off);
if (P_ISLEAF(lopaque))
{
CommandId cid = GetCurrentCommandId();
memcpy(xlbuf + hsize, &(char*)cid, sizeof(CommandId));
hsize += sizeof(CommandId);
}
if (newitemonleft)
{
memcpy(xlbuf + hsize, (char*) newitem, newitemsz);
hsize += newitemsz;
xlrec->otherblk = BufferGetBlockNumber(rbuf);
}
else
xlrec->otherblk = BufferGetBlockNumber(buf);
xlrec->rightblk = ropaque->btpo_next;
/*
* Dirrect access to page is not good but faster - we should
* implement some new func in page API.
*/
XLogRecPtr recptr = XLogInsert(RM_BTREE_ID, flag, xlbuf,
hsize, (char*)rightpage + (PageHeader) rightpage)->pd_upper,
((PageHeader) rightpage)->pd_special - ((PageHeader) rightpage)->upper);
PageSetLSN(leftpage, recptr);
PageSetSUI(leftpage, ThisStartUpID);
PageSetLSN(rightpage, recptr);
PageSetSUI(rightpage, ThisStartUpID);
if (!P_RIGHTMOST(ropaque))
{
PageSetLSN(spage, recptr);
PageSetSUI(spage, ThisStartUpID);
}
}
#endif
/*
* By here, the original data page has been split into two new halves,
* and these are correct. The algorithm requires that the left page
@@ -716,18 +809,8 @@ _bt_split(Relation rel, Buffer buf, OffsetNumber firstright,
PageRestoreTempPage(leftpage, origpage);
/*
* Finally, we need to grab the right sibling (if any) and fix the
* prev pointer there. We are guaranteed that this is deadlock-free
* since no other writer will be holding a lock on that page
* and trying to move left, and all readers release locks on a page
* before trying to fetch its neighbors.
*/
if (!P_RIGHTMOST(ropaque))
{
sbuf = _bt_getbuf(rel, ropaque->btpo_next, BT_WRITE);
spage = BufferGetPage(sbuf);
sopaque = (BTPageOpaque) PageGetSpecialPointer(spage);
sopaque->btpo_prev = BufferGetBlockNumber(rbuf);
@@ -1002,7 +1085,7 @@ _bt_getstackbuf(Relation rel, BTStack stack)
* two new children. The new root page is neither pinned nor locked, and
* we have also written out lbuf and rbuf and dropped their pins/locks.
*/
static void
void
_bt_newroot(Relation rel, Buffer lbuf, Buffer rbuf)
{
Buffer rootbuf;
@@ -1011,7 +1094,7 @@ _bt_newroot(Relation rel, Buffer lbuf, Buffer rbuf)
rootpage;
BlockNumber lbkno,
rbkno;
BlockNumber rootbknum;
BlockNumber rootblknum;
BTPageOpaque rootopaque;
ItemId itemid;
BTItem item;
@@ -1021,12 +1104,16 @@ _bt_newroot(Relation rel, Buffer lbuf, Buffer rbuf)
/* get a new root page */
rootbuf = _bt_getbuf(rel, P_NEW, BT_WRITE);
rootpage = BufferGetPage(rootbuf);
rootbknum = BufferGetBlockNumber(rootbuf);
rootblknum = BufferGetBlockNumber(rootbuf);
/* NO ELOG(ERROR) from here till newroot op is logged */
/* set btree special data */
rootopaque = (BTPageOpaque) PageGetSpecialPointer(rootpage);
rootopaque->btpo_prev = rootopaque->btpo_next = P_NONE;
rootopaque->btpo_flags |= BTP_ROOT;
rootopaque->btpo_parent = BTREE_METAPAGE;
lbkno = BufferGetBlockNumber(lbuf);
rbkno = BufferGetBlockNumber(rbuf);
@@ -1040,7 +1127,7 @@ _bt_newroot(Relation rel, Buffer lbuf, Buffer rbuf)
*/
((BTPageOpaque) PageGetSpecialPointer(lpage))->btpo_parent =
((BTPageOpaque) PageGetSpecialPointer(rpage))->btpo_parent =
rootbknum;
rootblknum;
/*
* Create downlink item for left page (old root). Since this will be
@@ -1058,7 +1145,7 @@ _bt_newroot(Relation rel, Buffer lbuf, Buffer rbuf)
* the two items will go into positions P_HIKEY and P_FIRSTKEY.
*/
if (PageAddItem(rootpage, (Item) new_item, itemsz, P_HIKEY, LP_USED) == InvalidOffsetNumber)
elog(FATAL, "btree: failed to add leftkey to new root page");
elog(STOP, "btree: failed to add leftkey to new root page");
pfree(new_item);
/*
@@ -1075,14 +1162,35 @@ _bt_newroot(Relation rel, Buffer lbuf, Buffer rbuf)
* insert the right page pointer into the new root page.
*/
if (PageAddItem(rootpage, (Item) new_item, itemsz, P_FIRSTKEY, LP_USED) == InvalidOffsetNumber)
elog(FATAL, "btree: failed to add rightkey to new root page");
elog(STOP, "btree: failed to add rightkey to new root page");
pfree(new_item);
#ifdef XLOG
/* XLOG stuff */
{
xl_btree_newroot xlrec;
xlrec.node = rel->rd_node;
xlrec.rootblk = rootblknum;
/*
* Dirrect access to page is not good but faster - we should
* implement some new func in page API.
*/
XLogRecPtr recptr = XLogInsert(RM_BTREE_ID, XLOG_BTREE_NEWROOT,
&xlrec, SizeOfBtreeNewroot,
(char*)rootpage + (PageHeader) rootpage)->pd_upper,
((PageHeader) rootpage)->pd_special - ((PageHeader) rootpage)->upper);
PageSetLSN(rootpage, recptr);
PageSetSUI(rootpage, ThisStartUpID);
}
#endif
/* write and let go of the new root buffer */
_bt_wrtbuf(rel, rootbuf);
/* update metadata page with new root block number */
_bt_metaproot(rel, rootbknum, 0);
_bt_metaproot(rel, rootblknum, 0);
/* update and release new sibling, and finally the old root */
_bt_wrtbuf(rel, rbuf);
@@ -1125,7 +1233,7 @@ _bt_pgaddtup(Relation rel,
if (PageAddItem(page, (Item) btitem, itemsize, itup_off,
LP_USED) == InvalidOffsetNumber)
elog(FATAL, "btree: failed to add item to the %s for %s",
elog(STOP, "btree: failed to add item to the %s for %s",
where, RelationGetRelationName(rel));
}