Improve gist XLOG code to follow the coding rules needed to prevent

torn-page problems.  This introduces some issues of its own, mainly
that there are now some critical sections of unreasonably broad scope,
but it's a step forward anyway.  Further cleanup will require some
code refactoring that I'd prefer to get Oleg and Teodor involved in.
This commit is contained in:
Tom Lane 2006-03-30 23:03:10 +00:00
parent 4243f2387a
commit 89395bfa6f
4 changed files with 230 additions and 261 deletions

View File

@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/gist/gist.c,v 1.129 2006/03/05 15:58:20 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/gist/gist.c,v 1.130 2006/03/30 23:03:09 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -90,6 +90,7 @@ gistbuild(PG_FUNCTION_ARGS)
double reltuples;
GISTBuildState buildstate;
Buffer buffer;
Page page;
/*
* We expect to be called exactly once for any index relation. If that's
@ -104,33 +105,33 @@ gistbuild(PG_FUNCTION_ARGS)
/* initialize the root page */
buffer = gistNewBuffer(index);
Assert(BufferGetBlockNumber(buffer) == GIST_ROOT_BLKNO);
page = BufferGetPage(buffer);
START_CRIT_SECTION();
GISTInitBuffer(buffer, F_LEAF);
if (!index->rd_istemp)
{
XLogRecPtr recptr;
XLogRecData rdata;
Page page;
rdata.buffer = InvalidBuffer;
rdata.data = (char *) &(index->rd_node);
rdata.len = sizeof(RelFileNode);
rdata.buffer = InvalidBuffer;
rdata.next = NULL;
page = BufferGetPage(buffer);
START_CRIT_SECTION();
recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_CREATE_INDEX, &rdata);
PageSetLSN(page, recptr);
PageSetTLI(page, ThisTimeLineID);
END_CRIT_SECTION();
}
else
PageSetLSN(BufferGetPage(buffer), XLogRecPtrForTemp);
PageSetLSN(page, XLogRecPtrForTemp);
LockBuffer(buffer, GIST_UNLOCK);
WriteBuffer(buffer);
END_CRIT_SECTION();
/* build the index */
buildstate.numindexattrs = indexInfo->ii_NumIndexAttrs;
buildstate.indtuples = 0;
@ -305,6 +306,15 @@ gistplacetopage(GISTInsertState *state, GISTSTATE *giststate)
bool is_splitted = false;
bool is_leaf = (GistPageIsLeaf(state->stack->page)) ? true : false;
/*
* XXX this code really ought to work by locking, but not modifying,
* all the buffers it needs; then starting a critical section; then
* modifying the buffers in an already-determined way and writing an
* XLOG record to reflect that. Since it doesn't, we've got to put
* a critical section around the entire process, which is horrible
* from a robustness point of view.
*/
START_CRIT_SECTION();
if (!is_leaf)
@ -312,6 +322,11 @@ gistplacetopage(GISTInsertState *state, GISTSTATE *giststate)
* This node's key has been modified, either because a child split
* occurred or because we needed to adjust our key for an insert in a
* child node. Therefore, remove the old version of this node's key.
*
* Note: for WAL replay, in the non-split case we handle this by
* setting up a one-element todelete array; in the split case, it's
* handled implicitly because the tuple vector passed to gistSplit
* won't include this tuple.
*/
PageIndexTupleDelete(state->stack->page, state->stack->childoffnum);
@ -336,9 +351,7 @@ gistplacetopage(GISTInsertState *state, GISTSTATE *giststate)
XLogRecData *rdata;
rdata = formSplitRdata(state->r->rd_node, state->stack->blkno,
&(state->key), dist);
START_CRIT_SECTION();
is_leaf, &(state->key), dist);
recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_PAGE_SPLIT, rdata);
ptr = dist;
@ -348,8 +361,6 @@ gistplacetopage(GISTInsertState *state, GISTSTATE *giststate)
PageSetTLI(BufferGetPage(ptr->buffer), ThisTimeLineID);
ptr = ptr->next;
}
END_CRIT_SECTION();
}
else
{
@ -410,7 +421,6 @@ gistplacetopage(GISTInsertState *state, GISTSTATE *giststate)
else
ourpage = dist;
/* now gets all needed data, and sets nsn's */
page = (Page) BufferGetPage(ourpage->buffer);
opaque = GistPageGetOpaque(page);
@ -437,8 +447,11 @@ gistplacetopage(GISTInsertState *state, GISTSTATE *giststate)
WriteBuffer(ptr->buffer);
ptr = ptr->next;
}
WriteNoReleaseBuffer(state->stack->buffer);
}
WriteNoReleaseBuffer(state->stack->buffer);
END_CRIT_SECTION();
}
else
{
@ -451,7 +464,7 @@ gistplacetopage(GISTInsertState *state, GISTSTATE *giststate)
if (!state->r->rd_istemp)
{
OffsetNumber noffs = 0,
offs[MAXALIGN(sizeof(OffsetNumber)) / sizeof(OffsetNumber)];
offs[1];
XLogRecPtr recptr;
XLogRecData *rdata;
@ -462,17 +475,14 @@ gistplacetopage(GISTInsertState *state, GISTSTATE *giststate)
noffs = 1;
}
rdata = formUpdateRdata(state->r->rd_node, state->stack->blkno,
offs, noffs, false, state->itup, state->ituplen,
rdata = formUpdateRdata(state->r->rd_node, state->stack->buffer,
offs, noffs, false,
state->itup, state->ituplen,
&(state->key));
START_CRIT_SECTION();
recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_ENTRY_UPDATE, rdata);
recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_PAGE_UPDATE, rdata);
PageSetLSN(state->stack->page, recptr);
PageSetTLI(state->stack->page, ThisTimeLineID);
END_CRIT_SECTION();
}
else
PageSetLSN(state->stack->page, XLogRecPtrForTemp);
@ -481,6 +491,8 @@ gistplacetopage(GISTInsertState *state, GISTSTATE *giststate)
state->needInsertComplete = false;
WriteNoReleaseBuffer(state->stack->buffer);
END_CRIT_SECTION();
if (!is_leaf) /* small optimization: inform scan ablout
* deleting... */
gistadjscans(state->r, GISTOP_DEL, state->stack->blkno,
@ -636,30 +648,14 @@ gistfindleaf(GISTInsertState *state, GISTSTATE *giststate)
}
/*
* Should have the same interface as XLogReadBuffer
*/
static Buffer
gistReadAndLockBuffer(Relation r, BlockNumber blkno)
{
Buffer buffer = ReadBuffer(r, blkno);
LockBuffer(buffer, GIST_SHARE);
return buffer;
}
/*
* Traverse the tree to find path from root page.
* Traverse the tree to find path from root page to specified "child" block.
*
* returns from the begining of closest parent;
*
* Function is used in both regular and recovery mode, so must work with
* different read functions (gistReadAndLockBuffer and XLogReadBuffer)
*
* To prevent deadlocks, this should lock only one page simultaneously.
*/
GISTInsertStack *
gistFindPath(Relation r, BlockNumber child,
Buffer (*myReadBuffer) (Relation, BlockNumber))
gistFindPath(Relation r, BlockNumber child)
{
Page page;
Buffer buffer;
@ -677,7 +673,8 @@ gistFindPath(Relation r, BlockNumber child,
while (top && top->blkno != child)
{
buffer = myReadBuffer(r, top->blkno); /* locks buffer */
buffer = ReadBuffer(r, top->blkno);
LockBuffer(buffer, GIST_SHARE);
gistcheckpage(r, buffer);
page = (Page) BufferGetPage(buffer);
@ -833,7 +830,7 @@ gistFindCorrectParent(Relation r, GISTInsertStack *child)
}
/* ok, find new path */
ptr = parent = gistFindPath(r, child->blkno, gistReadAndLockBuffer);
ptr = parent = gistFindPath(r, child->blkno);
Assert(ptr != NULL);
/* read all buffers as expected by caller */
@ -1192,27 +1189,31 @@ gistnewroot(Relation r, Buffer buffer, IndexTuple *itup, int len, ItemPointer ke
Assert(BufferGetBlockNumber(buffer) == GIST_ROOT_BLKNO);
page = BufferGetPage(buffer);
GISTInitBuffer(buffer, 0);
START_CRIT_SECTION();
GISTInitBuffer(buffer, 0); /* XXX not F_LEAF? */
gistfillbuffer(r, page, itup, len, FirstOffsetNumber);
if (!r->rd_istemp)
{
XLogRecPtr recptr;
XLogRecData *rdata;
rdata = formUpdateRdata(r->rd_node, GIST_ROOT_BLKNO,
NULL, 0, false, itup, len, key);
START_CRIT_SECTION();
rdata = formUpdateRdata(r->rd_node, buffer,
NULL, 0, false,
itup, len, key);
recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_NEW_ROOT, rdata);
PageSetLSN(page, recptr);
PageSetTLI(page, ThisTimeLineID);
END_CRIT_SECTION();
}
else
PageSetLSN(page, XLogRecPtrForTemp);
WriteNoReleaseBuffer(buffer);
END_CRIT_SECTION();
}
void

View File

@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/gist/gistvacuum.c,v 1.16 2006/03/05 15:58:20 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/gist/gistvacuum.c,v 1.17 2006/03/30 23:03:10 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -80,6 +80,12 @@ gistVacuumUpdate(GistVacuum *gv, BlockNumber blkno, bool needunion)
page = (Page) BufferGetPage(buffer);
maxoff = PageGetMaxOffsetNumber(page);
/*
* XXX need to reduce scope of changes to page so we can make this
* critical section less extensive
*/
START_CRIT_SECTION();
if (GistPageIsLeaf(page))
{
if (GistTuplesDeleted(page))
@ -188,11 +194,9 @@ gistVacuumUpdate(GistVacuum *gv, BlockNumber blkno, bool needunion)
ItemPointerSet(&key, blkno, TUPLE_IS_VALID);
rdata = formSplitRdata(gv->index->rd_node, blkno,
&key, dist);
false, &key, dist);
xlinfo = rdata->data;
START_CRIT_SECTION();
recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_PAGE_SPLIT, rdata);
ptr = dist;
while (ptr)
@ -202,7 +206,6 @@ gistVacuumUpdate(GistVacuum *gv, BlockNumber blkno, bool needunion)
ptr = ptr->next;
}
END_CRIT_SECTION();
pfree(xlinfo);
pfree(rdata);
}
@ -235,8 +238,6 @@ gistVacuumUpdate(GistVacuum *gv, BlockNumber blkno, bool needunion)
oldCtx = MemoryContextSwitchTo(gv->opCtx);
gistnewroot(gv->index, buffer, res.itup, res.ituplen, &key);
MemoryContextSwitchTo(oldCtx);
WriteNoReleaseBuffer(buffer);
}
needwrite = false;
@ -302,15 +303,14 @@ gistVacuumUpdate(GistVacuum *gv, BlockNumber blkno, bool needunion)
XLogRecPtr recptr;
char *xlinfo;
rdata = formUpdateRdata(gv->index->rd_node, blkno, todelete, ntodelete,
res.emptypage, addon, curlenaddon, NULL);
rdata = formUpdateRdata(gv->index->rd_node, buffer,
todelete, ntodelete, res.emptypage,
addon, curlenaddon, NULL);
xlinfo = rdata->data;
START_CRIT_SECTION();
recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_ENTRY_UPDATE, rdata);
recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_PAGE_UPDATE, rdata);
PageSetLSN(page, recptr);
PageSetTLI(page, ThisTimeLineID);
END_CRIT_SECTION();
pfree(xlinfo);
pfree(rdata);
@ -322,6 +322,8 @@ gistVacuumUpdate(GistVacuum *gv, BlockNumber blkno, bool needunion)
else
ReleaseBuffer(buffer);
END_CRIT_SECTION();
if (ncompleted && !gv->index->rd_istemp)
gistxlogInsertCompletion(gv->index->rd_node, completed, ncompleted);
@ -579,6 +581,17 @@ gistbulkdelete(PG_FUNCTION_ARGS)
*/
pushStackIfSplited(page, stack);
/*
* Remove deletable tuples from page
*
* XXX try to make this critical section shorter. Could do it
* by separating the callback loop from the actual tuple deletion,
* but that would affect the definition of the todelete[] array
* passed into the WAL record (because the indexes would all be
* pre-deletion).
*/
START_CRIT_SECTION();
maxoff = PageGetMaxOffsetNumber(page);
for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i))
@ -608,17 +621,17 @@ gistbulkdelete(PG_FUNCTION_ARGS)
{
XLogRecData *rdata;
XLogRecPtr recptr;
gistxlogEntryUpdate *xlinfo;
gistxlogPageUpdate *xlinfo;
rdata = formUpdateRdata(rel->rd_node, stack->blkno, todelete, ntodelete,
false, NULL, 0, NULL);
xlinfo = (gistxlogEntryUpdate *) rdata->data;
rdata = formUpdateRdata(rel->rd_node, buffer,
todelete, ntodelete, false,
NULL, 0,
NULL);
xlinfo = (gistxlogPageUpdate *) rdata->data;
START_CRIT_SECTION();
recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_ENTRY_UPDATE, rdata);
recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_PAGE_UPDATE, rdata);
PageSetLSN(page, recptr);
PageSetTLI(page, ThisTimeLineID);
END_CRIT_SECTION();
pfree(xlinfo);
pfree(rdata);
@ -627,6 +640,8 @@ gistbulkdelete(PG_FUNCTION_ARGS)
PageSetLSN(page, XLogRecPtrForTemp);
WriteNoReleaseBuffer(buffer);
}
END_CRIT_SECTION();
}
else
{

View File

@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/gist/gistxlog.c,v 1.12 2006/03/29 21:17:36 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/gist/gistxlog.c,v 1.13 2006/03/30 23:03:10 tgl Exp $
*-------------------------------------------------------------------------
*/
#include "postgres.h"
@ -25,11 +25,11 @@
typedef struct
{
gistxlogEntryUpdate *data;
gistxlogPageUpdate *data;
int len;
IndexTuple *itup;
OffsetNumber *todelete;
} EntryUpdateRecord;
} PageUpdateRecord;
typedef struct
{
@ -58,16 +58,15 @@ typedef struct gistIncompleteInsert
} gistIncompleteInsert;
MemoryContext opCtx;
MemoryContext insertCtx;
static MemoryContext opCtx; /* working memory for operations */
static MemoryContext insertCtx; /* holds incomplete_inserts list */
static List *incomplete_inserts;
#define ItemPointerEQ( a, b ) \
( \
ItemPointerGetOffsetNumber(a) == ItemPointerGetOffsetNumber(b) && \
ItemPointerGetBlockNumber (a) == ItemPointerGetBlockNumber(b) \
)
#define ItemPointerEQ(a, b) \
( ItemPointerGetOffsetNumber(a) == ItemPointerGetOffsetNumber(b) && \
ItemPointerGetBlockNumber (a) == ItemPointerGetBlockNumber(b) )
static void
pushIncompleteInsert(RelFileNode node, XLogRecPtr lsn, ItemPointerData key,
@ -101,7 +100,13 @@ pushIncompleteInsert(RelFileNode node, XLogRecPtr lsn, ItemPointerData key,
}
Assert(ninsert->lenblk > 0);
incomplete_inserts = lappend(incomplete_inserts, ninsert);
/*
* Stick the new incomplete insert onto the front of the list, not the
* back. This is so that gist_xlog_cleanup will process incompletions
* in last-in-first-out order.
*/
incomplete_inserts = lcons(ninsert, incomplete_inserts);
MemoryContextSwitchTo(oldCxt);
}
@ -116,10 +121,9 @@ forgetIncompleteInsert(RelFileNode node, ItemPointerData key)
if (RelFileNodeEquals(node, insert->node) && ItemPointerEQ(&(insert->key), &(key)))
{
/* found */
pfree(insert->blkno);
incomplete_inserts = list_delete_ptr(incomplete_inserts, insert);
pfree(insert->blkno);
pfree(insert);
break;
}
@ -127,25 +131,25 @@ forgetIncompleteInsert(RelFileNode node, ItemPointerData key)
}
static void
decodeEntryUpdateRecord(EntryUpdateRecord *decoded, XLogRecord *record)
decodePageUpdateRecord(PageUpdateRecord *decoded, XLogRecord *record)
{
char *begin = XLogRecGetData(record),
*ptr;
int i = 0,
addpath = 0;
decoded->data = (gistxlogEntryUpdate *) begin;
decoded->data = (gistxlogPageUpdate *) begin;
if (decoded->data->ntodelete)
{
decoded->todelete = (OffsetNumber *) (begin + sizeof(gistxlogEntryUpdate) + addpath);
decoded->todelete = (OffsetNumber *) (begin + sizeof(gistxlogPageUpdate) + addpath);
addpath = MAXALIGN(sizeof(OffsetNumber) * decoded->data->ntodelete);
}
else
decoded->todelete = NULL;
decoded->len = 0;
ptr = begin + sizeof(gistxlogEntryUpdate) + addpath;
ptr = begin + sizeof(gistxlogPageUpdate) + addpath;
while (ptr - begin < record->xl_len)
{
decoded->len++;
@ -154,7 +158,7 @@ decodeEntryUpdateRecord(EntryUpdateRecord *decoded, XLogRecord *record)
decoded->itup = (IndexTuple *) palloc(sizeof(IndexTuple) * decoded->len);
ptr = begin + sizeof(gistxlogEntryUpdate) + addpath;
ptr = begin + sizeof(gistxlogPageUpdate) + addpath;
while (ptr - begin < record->xl_len)
{
decoded->itup[i] = (IndexTuple) ptr;
@ -167,38 +171,30 @@ decodeEntryUpdateRecord(EntryUpdateRecord *decoded, XLogRecord *record)
* redo any page update (except page split)
*/
static void
gistRedoEntryUpdateRecord(XLogRecPtr lsn, XLogRecord *record, bool isnewroot)
gistRedoPageUpdateRecord(XLogRecPtr lsn, XLogRecord *record, bool isnewroot)
{
EntryUpdateRecord xlrec;
PageUpdateRecord xlrec;
Relation reln;
Buffer buffer;
Page page;
decodeEntryUpdateRecord(&xlrec, record);
/* nothing to do if whole page was backed up (and no info to do it with) */
if (record->xl_info & XLR_BKP_BLOCK_1)
return;
decodePageUpdateRecord(&xlrec, record);
reln = XLogOpenRelation(xlrec.data->node);
buffer = XLogReadBuffer(reln, xlrec.data->blkno, false);
if (!BufferIsValid(buffer))
elog(PANIC, "block %u unfound", xlrec.data->blkno);
return;
page = (Page) BufferGetPage(buffer);
if (isnewroot)
if (XLByteLE(lsn, PageGetLSN(page)))
{
if (!PageIsNew((PageHeader) page) && XLByteLE(lsn, PageGetLSN(page)))
{
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
ReleaseBuffer(buffer);
return;
}
}
else
{
if (XLByteLE(lsn, PageGetLSN(page)))
{
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
ReleaseBuffer(buffer);
return;
}
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
ReleaseBuffer(buffer);
return;
}
if (xlrec.data->isemptypage)
@ -237,9 +233,9 @@ gistRedoEntryUpdateRecord(XLogRecPtr lsn, XLogRecord *record, bool isnewroot)
GistClearTuplesDeleted(page);
}
GistPageGetOpaque(page)->rightlink = InvalidBlockNumber;
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
GistPageGetOpaque(page)->rightlink = InvalidBlockNumber;
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
WriteBuffer(buffer);
@ -294,38 +290,21 @@ gistRedoPageSplitRecord(XLogRecPtr lsn, XLogRecord *record)
Buffer buffer;
Page page;
int i;
int flags = 0;
int flags;
decodePageSplitRecord(&xlrec, record);
reln = XLogOpenRelation(xlrec.data->node);
/* first of all wee need get F_LEAF flag from original page */
buffer = XLogReadBuffer(reln, xlrec.data->origblkno, false);
if (!BufferIsValid(buffer))
elog(PANIC, "block %u unfound", xlrec.data->origblkno);
page = (Page) BufferGetPage(buffer);
flags = (GistPageIsLeaf(page)) ? F_LEAF : 0;
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
ReleaseBuffer(buffer);
flags = xlrec.data->origleaf ? F_LEAF : 0;
/* loop around all pages */
for (i = 0; i < xlrec.data->npage; i++)
{
NewPage *newpage = xlrec.page + i;
bool isorigpage = (xlrec.data->origblkno == newpage->header->blkno) ? true : false;
buffer = XLogReadBuffer(reln, newpage->header->blkno, !isorigpage);
if (!BufferIsValid(buffer))
elog(PANIC, "block %u unfound", newpage->header->blkno);
buffer = XLogReadBuffer(reln, newpage->header->blkno, true);
Assert(BufferIsValid(buffer));
page = (Page) BufferGetPage(buffer);
if (XLByteLE(lsn, PageGetLSN(page)))
{
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
ReleaseBuffer(buffer);
continue;
}
/* ok, clear buffer */
GISTInitBuffer(buffer, flags);
@ -399,12 +378,11 @@ gist_redo(XLogRecPtr lsn, XLogRecord *record)
oldCxt = MemoryContextSwitchTo(opCtx);
switch (info)
{
case XLOG_GIST_ENTRY_UPDATE:
case XLOG_GIST_ENTRY_DELETE:
gistRedoEntryUpdateRecord(lsn, record, false);
case XLOG_GIST_PAGE_UPDATE:
gistRedoPageUpdateRecord(lsn, record, false);
break;
case XLOG_GIST_NEW_ROOT:
gistRedoEntryUpdateRecord(lsn, record, true);
gistRedoPageUpdateRecord(lsn, record, true);
break;
case XLOG_GIST_PAGE_SPLIT:
gistRedoPageSplitRecord(lsn, record);
@ -433,7 +411,7 @@ out_target(StringInfo buf, RelFileNode node, ItemPointerData key)
}
static void
out_gistxlogEntryUpdate(StringInfo buf, gistxlogEntryUpdate *xlrec)
out_gistxlogPageUpdate(StringInfo buf, gistxlogPageUpdate *xlrec)
{
out_target(buf, xlrec->node, xlrec->key);
appendStringInfo(buf, "; block number %u", xlrec->blkno);
@ -455,17 +433,13 @@ gist_desc(StringInfo buf, uint8 xl_info, char *rec)
switch (info)
{
case XLOG_GIST_ENTRY_UPDATE:
appendStringInfo(buf, "entry_update: ");
out_gistxlogEntryUpdate(buf, (gistxlogEntryUpdate *) rec);
break;
case XLOG_GIST_ENTRY_DELETE:
appendStringInfo(buf, "entry_delete: ");
out_gistxlogEntryUpdate(buf, (gistxlogEntryUpdate *) rec);
case XLOG_GIST_PAGE_UPDATE:
appendStringInfo(buf, "page_update: ");
out_gistxlogPageUpdate(buf, (gistxlogPageUpdate *) rec);
break;
case XLOG_GIST_NEW_ROOT:
appendStringInfo(buf, "new_root: ");
out_target(buf, ((gistxlogEntryUpdate *) rec)->node, ((gistxlogEntryUpdate *) rec)->key);
out_target(buf, ((gistxlogPageUpdate *) rec)->node, ((gistxlogPageUpdate *) rec)->key);
break;
case XLOG_GIST_PAGE_SPLIT:
out_gistxlogPageSplit(buf, (gistxlogPageSplit *) rec);
@ -506,60 +480,47 @@ gist_form_invalid_tuple(BlockNumber blkno)
return tuple;
}
static Buffer
gistXLogReadAndLockBuffer(Relation r, BlockNumber blkno)
{
Buffer buffer = XLogReadBuffer(r, blkno, false);
if (!BufferIsValid(buffer))
elog(PANIC, "block %u unfound", blkno);
return buffer;
}
static void
gixtxlogFindPath(Relation index, gistIncompleteInsert *insert)
gistxlogFindPath(Relation index, gistIncompleteInsert *insert)
{
GISTInsertStack *top;
insert->pathlen = 0;
insert->path = NULL;
if ((top = gistFindPath(index, insert->origblkno, gistXLogReadAndLockBuffer)) != NULL)
if ((top = gistFindPath(index, insert->origblkno)) != NULL)
{
int i;
GISTInsertStack *ptr = top;
GISTInsertStack *ptr;
while (ptr)
{
for (ptr = top; ptr; ptr = ptr->parent)
insert->pathlen++;
ptr = ptr->parent;
}
insert->path = (BlockNumber *) palloc(sizeof(BlockNumber) * insert->pathlen);
i = 0;
ptr = top;
while (ptr)
{
insert->path[i] = ptr->blkno;
i++;
ptr = ptr->parent;
}
for (ptr = top; ptr; ptr = ptr->parent)
insert->path[i++] = ptr->blkno;
}
else
elog(LOG, "lost parent for block %u", insert->origblkno);
}
/*
* Continue insert after crash. In normal situation, there isn't any incomplete
* inserts, but if it might be after crash, WAL may has not a record of completetion.
* Continue insert after crash. In normal situations, there aren't any
* incomplete inserts, but if a crash occurs partway through an insertion
* sequence, we'll need to finish making the index valid at the end of WAL
* replay.
*
* Note that we assume the index is now in a valid state, except for the
* unfinished insertion. In particular it's safe to invoke gistFindPath();
* there shouldn't be any garbage pages for it to run into.
*
* Although stored LSN in gistIncompleteInsert is a LSN of child page,
* we can compare it with LSN of parent, because parent is always locked
* while we change child page (look at gistmakedeal). So if parent's LSN is
* lesser than stored lsn then changes in parent doesn't do yet.
* less than stored lsn then changes in parent aren't done yet.
*/
static void
gistContinueInsert(gistIncompleteInsert *insert)
@ -602,6 +563,12 @@ gistContinueInsert(gistIncompleteInsert *insert)
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
WriteBuffer(buffer);
/*
* XXX fall out to avoid making LOG message at bottom of routine.
* I think the logic for when to emit that message is all wrong...
*/
return;
}
else
{
@ -610,7 +577,7 @@ gistContinueInsert(gistIncompleteInsert *insert)
int numbuffer;
/* construct path */
gixtxlogFindPath(index, insert);
gistxlogFindPath(index, insert);
Assert(insert->pathlen > 0);
@ -625,9 +592,8 @@ gistContinueInsert(gistIncompleteInsert *insert)
childfound = 0;
numbuffer = 1;
buffers[numbuffer - 1] = XLogReadBuffer(index, insert->path[i], false);
if (!BufferIsValid(buffers[numbuffer - 1]))
elog(PANIC, "block %u unfound", insert->path[i]);
buffers[numbuffer - 1] = ReadBuffer(index, insert->path[i]);
LockBuffer(buffers[numbuffer - 1], GIST_EXCLUSIVE);
pages[numbuffer - 1] = BufferGetPage(buffers[numbuffer - 1]);
if (XLByteLE(insert->lsn, PageGetLSN(pages[numbuffer - 1])))
@ -661,10 +627,9 @@ gistContinueInsert(gistIncompleteInsert *insert)
if (gistnospace(pages[numbuffer - 1], itup, lenitup))
{
/* no space left on page, so we should split */
buffers[numbuffer] = XLogReadBuffer(index, P_NEW, true);
if (!BufferIsValid(buffers[numbuffer]))
elog(PANIC, "could not obtain new block");
/* no space left on page, so we must split */
buffers[numbuffer] = ReadBuffer(index, P_NEW);
LockBuffer(buffers[numbuffer], GIST_EXCLUSIVE);
GISTInitBuffer(buffers[numbuffer], 0);
pages[numbuffer] = BufferGetPage(buffers[numbuffer]);
gistfillbuffer(index, pages[numbuffer], itup, lenitup, FirstOffsetNumber);
@ -678,7 +643,8 @@ gistContinueInsert(gistIncompleteInsert *insert)
* we split root, just copy tuples from old root to new
* page
*/
parentitup = gistextractbuffer(buffers[numbuffer - 1], &pituplen);
parentitup = gistextractbuffer(buffers[numbuffer - 1],
&pituplen);
/* sanity check */
if (i + 1 != insert->pathlen)
@ -686,9 +652,8 @@ gistContinueInsert(gistIncompleteInsert *insert)
RelationGetRelationName(index));
/* fill new page */
buffers[numbuffer] = XLogReadBuffer(index, P_NEW, true);
if (!BufferIsValid(buffers[numbuffer]))
elog(PANIC, "could not obtain new block");
buffers[numbuffer] = ReadBuffer(index, P_NEW);
LockBuffer(buffers[numbuffer], GIST_EXCLUSIVE);
GISTInitBuffer(buffers[numbuffer], 0);
pages[numbuffer] = BufferGetPage(buffers[numbuffer]);
gistfillbuffer(index, pages[numbuffer], parentitup, pituplen, FirstOffsetNumber);
@ -748,16 +713,10 @@ void
gist_xlog_cleanup(void)
{
ListCell *l;
List *reverse = NIL;
MemoryContext oldCxt = MemoryContextSwitchTo(insertCtx);
/* we should call gistContinueInsert in reverse order */
MemoryContext oldCxt;
oldCxt = MemoryContextSwitchTo(opCtx);
foreach(l, incomplete_inserts)
reverse = lappend(reverse, lfirst(l));
MemoryContextSwitchTo(opCtx);
foreach(l, reverse)
{
gistIncompleteInsert *insert = (gistIncompleteInsert *) lfirst(l);
@ -772,10 +731,9 @@ gist_xlog_cleanup(void)
XLogRecData *
formSplitRdata(RelFileNode node, BlockNumber blkno,
formSplitRdata(RelFileNode node, BlockNumber blkno, bool page_is_leaf,
ItemPointer key, SplitedPageLayout *dist)
{
XLogRecData *rdata;
gistxlogPageSplit *xlrec = (gistxlogPageSplit *) palloc(sizeof(gistxlogPageSplit));
SplitedPageLayout *ptr;
@ -793,6 +751,7 @@ formSplitRdata(RelFileNode node, BlockNumber blkno,
xlrec->node = node;
xlrec->origblkno = blkno;
xlrec->origleaf = page_is_leaf;
xlrec->npage = (uint16) npage;
if (key)
xlrec->key = *key;
@ -825,68 +784,64 @@ formSplitRdata(RelFileNode node, BlockNumber blkno,
return rdata;
}
/*
* Construct the rdata array for an XLOG record describing a page update
* (deletion and/or insertion of tuples on a single index page).
*
* Note that both the todelete array and the tuples are marked as belonging
* to the target buffer; they need not be stored in XLOG if XLogInsert decides
* to log the whole buffer contents instead. Also, we take care that there's
* at least one rdata item referencing the buffer, even when ntodelete and
* ituplen are both zero; this ensures that XLogInsert knows about the buffer.
*/
XLogRecData *
formUpdateRdata(RelFileNode node, BlockNumber blkno,
formUpdateRdata(RelFileNode node, Buffer buffer,
OffsetNumber *todelete, int ntodelete, bool emptypage,
IndexTuple *itup, int ituplen, ItemPointer key)
{
XLogRecData *rdata;
gistxlogEntryUpdate *xlrec = (gistxlogEntryUpdate *) palloc(sizeof(gistxlogEntryUpdate));
gistxlogPageUpdate *xlrec;
int cur,
i;
/* ugly wart in API: emptypage causes us to ignore other inputs */
if (emptypage)
ntodelete = ituplen = 0;
rdata = (XLogRecData *) palloc(sizeof(XLogRecData) * (2 + ituplen));
xlrec = (gistxlogPageUpdate *) palloc(sizeof(gistxlogPageUpdate));
xlrec->node = node;
xlrec->blkno = blkno;
xlrec->blkno = BufferGetBlockNumber(buffer);
xlrec->ntodelete = ntodelete;
xlrec->isemptypage = emptypage;
if (key)
xlrec->key = *key;
else
ItemPointerSetInvalid(&(xlrec->key));
if (emptypage)
rdata[0].data = (char *) xlrec;
rdata[0].len = sizeof(gistxlogPageUpdate);
rdata[0].buffer = InvalidBuffer;
rdata[0].next = &(rdata[1]);
rdata[1].data = (char *) todelete;
rdata[1].len = MAXALIGN(sizeof(OffsetNumber) * ntodelete);
rdata[1].buffer = buffer;
rdata[1].buffer_std = true;
rdata[1].next = NULL;
/* new tuples */
cur = 2;
for (i = 0; i < ituplen; i++)
{
xlrec->isemptypage = true;
xlrec->ntodelete = 0;
rdata = (XLogRecData *) palloc(sizeof(XLogRecData));
rdata->buffer = InvalidBuffer;
rdata->data = (char *) xlrec;
rdata->len = sizeof(gistxlogEntryUpdate);
rdata->next = NULL;
}
else
{
int cur = 1,
i;
xlrec->isemptypage = false;
xlrec->ntodelete = ntodelete;
rdata = (XLogRecData *) palloc(sizeof(XLogRecData) * (2 + ituplen));
rdata->buffer = InvalidBuffer;
rdata->data = (char *) xlrec;
rdata->len = sizeof(gistxlogEntryUpdate);
rdata->next = NULL;
if (ntodelete)
{
rdata[cur - 1].next = &(rdata[cur]);
rdata[cur].buffer = InvalidBuffer;
rdata[cur].data = (char *) todelete;
rdata[cur].len = MAXALIGN(sizeof(OffsetNumber) * ntodelete);
rdata[cur].next = NULL;
cur++;
}
/* new tuples */
for (i = 0; i < ituplen; i++)
{
rdata[cur].buffer = InvalidBuffer;
rdata[cur].data = (char *) (itup[i]);
rdata[cur].len = IndexTupleSize(itup[i]);
rdata[cur].next = NULL;
rdata[cur - 1].next = &(rdata[cur]);
cur++;
}
rdata[cur - 1].next = &(rdata[cur]);
rdata[cur].data = (char *) (itup[i]);
rdata[cur].len = IndexTupleSize(itup[i]);
rdata[cur].buffer = buffer;
rdata[cur].buffer_std = true;
rdata[cur].next = NULL;
cur++;
}
return rdata;

View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/gist_private.h,v 1.11 2006/03/24 04:32:13 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/gist_private.h,v 1.12 2006/03/30 23:03:10 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -80,11 +80,13 @@ typedef GISTScanOpaqueData *GISTScanOpaque;
/* XLog stuff */
extern const XLogRecPtr XLogRecPtrForTemp;
#define XLOG_GIST_ENTRY_UPDATE 0x00
#define XLOG_GIST_ENTRY_DELETE 0x10
#define XLOG_GIST_NEW_ROOT 0x20
#define XLOG_GIST_PAGE_UPDATE 0x00
#define XLOG_GIST_NEW_ROOT 0x20
#define XLOG_GIST_PAGE_SPLIT 0x30
#define XLOG_GIST_INSERT_COMPLETE 0x40
#define XLOG_GIST_CREATE_INDEX 0x50
typedef struct gistxlogEntryUpdate
typedef struct gistxlogPageUpdate
{
RelFileNode node;
BlockNumber blkno;
@ -100,17 +102,16 @@ typedef struct gistxlogEntryUpdate
/*
* follow: 1. todelete OffsetNumbers 2. tuples to insert
*/
} gistxlogEntryUpdate;
#define XLOG_GIST_PAGE_SPLIT 0x30
} gistxlogPageUpdate;
typedef struct gistxlogPageSplit
{
RelFileNode node;
BlockNumber origblkno; /* splitted page */
bool origleaf; /* was splitted page a leaf page? */
uint16 npage;
/* see comments on gistxlogEntryUpdate */
/* see comments on gistxlogPageUpdate */
ItemPointerData key;
/*
@ -118,22 +119,19 @@ typedef struct gistxlogPageSplit
*/
} gistxlogPageSplit;
#define XLOG_GIST_INSERT_COMPLETE 0x40
typedef struct gistxlogPage
{
BlockNumber blkno;
int num;
int num; /* number of index tuples following */
} gistxlogPage;
#define XLOG_GIST_CREATE_INDEX 0x50
typedef struct gistxlogInsertComplete
{
RelFileNode node;
/* follows ItemPointerData key to clean */
} gistxlogInsertComplete;
/* SplitedPageLayout - gistSplit function result */
typedef struct SplitedPageLayout
{
@ -239,8 +237,7 @@ extern void gistnewroot(Relation r, Buffer buffer, IndexTuple *itup, int len, It
extern IndexTuple *gistSplit(Relation r, Buffer buffer, IndexTuple *itup,
int *len, SplitedPageLayout **dist, GISTSTATE *giststate);
extern GISTInsertStack *gistFindPath(Relation r, BlockNumber child,
Buffer (*myReadBuffer) (Relation, BlockNumber));
extern GISTInsertStack *gistFindPath(Relation r, BlockNumber child);
/* gistxlog.c */
extern void gist_redo(XLogRecPtr lsn, XLogRecord *record);
@ -249,11 +246,12 @@ extern void gist_xlog_startup(void);
extern void gist_xlog_cleanup(void);
extern IndexTuple gist_form_invalid_tuple(BlockNumber blkno);
extern XLogRecData *formUpdateRdata(RelFileNode node, BlockNumber blkno,
extern XLogRecData *formUpdateRdata(RelFileNode node, Buffer buffer,
OffsetNumber *todelete, int ntodelete, bool emptypage,
IndexTuple *itup, int ituplen, ItemPointer key);
extern XLogRecData *formSplitRdata(RelFileNode node, BlockNumber blkno,
extern XLogRecData *formSplitRdata(RelFileNode node,
BlockNumber blkno, bool page_is_leaf,
ItemPointer key, SplitedPageLayout *dist);
extern XLogRecPtr gistxlogInsertCompletion(RelFileNode node, ItemPointerData *keys, int len);