/*
* Post-VACUUM cleanup.
*
* Result: a palloc'd struct containing statistical info for VACUUM displays.
*/
IndexBulkDeleteResult *
blvacuumcleanup(IndexVacuumInfo *info, IndexBulkDeleteResult *stats)
{
Relation index = info->index;
BlockNumber npages,
blkno;
BlockNumber totFreePages;
if (info->analyze_only)
return stats;
if (stats == NULL)
stats = (IndexBulkDeleteResult *) palloc0(sizeof(IndexBulkDeleteResult));
/*
* Iterate over the pages: insert deleted pages into FSM and collect
* statistics.
*/
npages = RelationGetNumberOfBlocks(index);
totFreePages = 0;
for (blkno = BLOOM_HEAD_BLKNO; blkno < npages; blkno++)
{
Buffer buffer;
Page page;
vacuum_delay_point();
buffer = ReadBufferExtended(index, MAIN_FORKNUM, blkno,
RBM_NORMAL, info->strategy);
LockBuffer(buffer, BUFFER_LOCK_SHARE);
page = BufferGetPage(buffer, NULL, NULL, BGP_NO_SNAPSHOT_TEST);
if (BloomPageIsDeleted(page))
{
RecordFreeIndexPage(index, blkno);
totFreePages++;
}
else
{
stats->num_index_tuples += BloomPageGetMaxOffset(page);
stats->estimated_count += BloomPageGetMaxOffset(page);
}
UnlockReleaseBuffer(buffer);
}
IndexFreeSpaceMapVacuum(info->index);
stats->pages_free = totFreePages;
stats->num_pages = RelationGetNumberOfBlocks(index);
return stats;
}
/*
* Insert all matching tuples into to a bitmap.
*/
int64
blgetbitmap(IndexScanDesc scan, TIDBitmap *tbm)
{
int64 ntids = 0;
BlockNumber blkno = BLOOM_HEAD_BLKNO,
npages;
int i;
BufferAccessStrategy bas;
BloomScanOpaque so = (BloomScanOpaque) scan->opaque;
if (so->sign == NULL)
{
/* New search: have to calculate search signature */
ScanKey skey = scan->keyData;
so->sign = palloc0(sizeof(SignType) * so->state.opts.bloomLength);
for (i = 0; i < scan->numberOfKeys; i++)
{
/*
* Assume bloom-indexable operators to be strict, so nothing could
* be found for NULL key.
*/
if (skey->sk_flags & SK_ISNULL)
{
pfree(so->sign);
so->sign = NULL;
return 0;
}
/* Add next value to the signature */
signValue(&so->state, so->sign, skey->sk_argument,
skey->sk_attno - 1);
skey++;
}
}
/*
* We're going to read the whole index. This is why we use appropriate
* buffer access strategy.
*/
bas = GetAccessStrategy(BAS_BULKREAD);
npages = RelationGetNumberOfBlocks(scan->indexRelation);
for (blkno = BLOOM_HEAD_BLKNO; blkno < npages; blkno++)
{
Buffer buffer;
Page page;
buffer = ReadBufferExtended(scan->indexRelation, MAIN_FORKNUM,
blkno, RBM_NORMAL, bas);
LockBuffer(buffer, BUFFER_LOCK_SHARE);
page = BufferGetPage(buffer);
TestForOldSnapshot(scan->xs_snapshot, scan->indexRelation, page);
if (!BloomPageIsDeleted(page))
{
OffsetNumber offset,
maxOffset = BloomPageGetMaxOffset(page);
for (offset = 1; offset <= maxOffset; offset++)
{
BloomTuple *itup = BloomPageGetTuple(&so->state, page, offset);
bool res = true;
/* Check index signature with scan signature */
for (i = 0; i < so->state.opts.bloomLength; i++)
{
if ((itup->sign[i] & so->sign[i]) != so->sign[i])
{
res = false;
break;
}
}
/* Add matching tuples to bitmap */
if (res)
{
tbm_add_tuples(tbm, &itup->heapPtr, 1, true);
ntids++;
}
}
}
UnlockReleaseBuffer(buffer);
CHECK_FOR_INTERRUPTS();
}
FreeAccessStrategy(bas);
return ntids;
}
/*
* Bulk deletion of all index entries pointing to a set of heap tuples.
* The set of target tuples is specified via a callback routine that tells
* whether any given heap tuple (identified by ItemPointer) is being deleted.
*
* Result: a palloc'd struct containing statistical info for VACUUM displays.
*/
IndexBulkDeleteResult *
blbulkdelete(IndexVacuumInfo *info, IndexBulkDeleteResult *stats,
IndexBulkDeleteCallback callback, void *callback_state)
{
Relation index = info->index;
BlockNumber blkno,
npages;
FreeBlockNumberArray notFullPage;
int countPage = 0;
BloomState state;
Buffer buffer;
Page page;
GenericXLogState *gxlogState;
if (stats == NULL)
stats = (IndexBulkDeleteResult *) palloc0(sizeof(IndexBulkDeleteResult));
initBloomState(&state, index);
/*
* Interate over the pages. We don't care about concurrently added pages,
* they can't contain tuples to delete.
*/
npages = RelationGetNumberOfBlocks(index);
for (blkno = BLOOM_HEAD_BLKNO; blkno < npages; blkno++)
{
BloomTuple *itup,
*itupPtr,
*itupEnd;
buffer = ReadBufferExtended(index, MAIN_FORKNUM, blkno,
RBM_NORMAL, info->strategy);
LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE);
gxlogState = GenericXLogStart(index);
page = GenericXLogRegisterBuffer(gxlogState, buffer, 0);
if (BloomPageIsDeleted(page))
{
UnlockReleaseBuffer(buffer);
GenericXLogAbort(gxlogState);
CHECK_FOR_INTERRUPTS();
continue;
}
/* Iterate over the tuples */
itup = itupPtr = BloomPageGetTuple(&state, page, FirstOffsetNumber);
itupEnd = BloomPageGetTuple(&state, page,
OffsetNumberNext(BloomPageGetMaxOffset(page)));
while (itup < itupEnd)
{
/* Do we have to delete this tuple? */
if (callback(&itup->heapPtr, callback_state))
{
stats->tuples_removed += 1;
BloomPageGetOpaque(page)->maxoff--;
}
else
{
if (itupPtr != itup)
{
/*
* If we already delete something before, we have to move
* this tuple backward.
*/
memmove((Pointer) itupPtr, (Pointer) itup,
state.sizeOfBloomTuple);
}
stats->num_index_tuples++;
itupPtr = BloomPageGetNextTuple(&state, itupPtr);
}
itup = BloomPageGetNextTuple(&state, itup);
}
Assert(itupPtr == BloomPageGetTuple(&state, page,
OffsetNumberNext(BloomPageGetMaxOffset(page))));
/*
* Add page to notFullPage list if we will not mark page as deleted and
* there is a free space on it
*/
if (BloomPageGetMaxOffset(page) != 0 &&
BloomPageGetFreeSpace(&state, page) > state.sizeOfBloomTuple &&
countPage < BloomMetaBlockN)
notFullPage[countPage++] = blkno;
/* Did we delete something? */
if (itupPtr != itup)
{
/* Is it empty page now? */
if (BloomPageGetMaxOffset(page) == 0)
BloomPageSetDeleted(page);
/* Adjust pg_lower */
((PageHeader) page)->pd_lower = (Pointer) itupPtr - page;
/* Finish WAL-logging */
GenericXLogFinish(gxlogState);
}
else
{
/* Didn't change anything: abort WAL-logging */
GenericXLogAbort(gxlogState);
}
UnlockReleaseBuffer(buffer);
CHECK_FOR_INTERRUPTS();
}
if (countPage > 0)
{
BloomMetaPageData *metaData;
buffer = ReadBuffer(index, BLOOM_METAPAGE_BLKNO);
LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE);
gxlogState = GenericXLogStart(index);
page = GenericXLogRegisterBuffer(gxlogState, buffer, 0);
metaData = BloomPageGetMeta(page);
memcpy(metaData->notFullPage, notFullPage, sizeof(BlockNumber) * countPage);
metaData->nStart = 0;
metaData->nEnd = countPage;
GenericXLogFinish(gxlogState);
UnlockReleaseBuffer(buffer);
}
return stats;
}
/*
* Bulk deletion of all index entries pointing to a set of heap tuples.
* The set of target tuples is specified via a callback routine that tells
* whether any given heap tuple (identified by ItemPointer) is being deleted.
*
* Result: a palloc'd struct containing statistical info for VACUUM displays.
*/
IndexBulkDeleteResult *
blbulkdelete(IndexVacuumInfo *info, IndexBulkDeleteResult *stats,
IndexBulkDeleteCallback callback, void *callback_state)
{
Relation index = info->index;
BlockNumber blkno,
npages;
FreeBlockNumberArray notFullPage;
int countPage = 0;
BloomState state;
Buffer buffer;
Page page;
BloomMetaPageData *metaData;
GenericXLogState *gxlogState;
if (stats == NULL)
stats = (IndexBulkDeleteResult *) palloc0(sizeof(IndexBulkDeleteResult));
initBloomState(&state, index);
/*
* Interate over the pages. We don't care about concurrently added pages,
* they can't contain tuples to delete.
*/
npages = RelationGetNumberOfBlocks(index);
for (blkno = BLOOM_HEAD_BLKNO; blkno < npages; blkno++)
{
BloomTuple *itup,
*itupPtr,
*itupEnd;
vacuum_delay_point();
buffer = ReadBufferExtended(index, MAIN_FORKNUM, blkno,
RBM_NORMAL, info->strategy);
LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE);
gxlogState = GenericXLogStart(index);
page = GenericXLogRegisterBuffer(gxlogState, buffer, 0);
/* Ignore empty/deleted pages until blvacuumcleanup() */
if (PageIsNew(page) || BloomPageIsDeleted(page))
{
UnlockReleaseBuffer(buffer);
GenericXLogAbort(gxlogState);
continue;
}
/*
* Iterate over the tuples. itup points to current tuple being
* scanned, itupPtr points to where to save next non-deleted tuple.
*/
itup = itupPtr = BloomPageGetTuple(&state, page, FirstOffsetNumber);
itupEnd = BloomPageGetTuple(&state, page,
OffsetNumberNext(BloomPageGetMaxOffset(page)));
while (itup < itupEnd)
{
/* Do we have to delete this tuple? */
if (callback(&itup->heapPtr, callback_state))
{
/* Yes; adjust count of tuples that will be left on page */
BloomPageGetOpaque(page)->maxoff--;
stats->tuples_removed += 1;
}
else
{
/* No; copy it to itupPtr++, but skip copy if not needed */
if (itupPtr != itup)
memmove((Pointer) itupPtr, (Pointer) itup,
state.sizeOfBloomTuple);
itupPtr = BloomPageGetNextTuple(&state, itupPtr);
}
itup = BloomPageGetNextTuple(&state, itup);
}
/* Assert that we counted correctly */
Assert(itupPtr == BloomPageGetTuple(&state, page,
OffsetNumberNext(BloomPageGetMaxOffset(page))));
/*
* Add page to new notFullPage list if we will not mark page as
* deleted and there is free space on it
*/
if (BloomPageGetMaxOffset(page) != 0 &&
BloomPageGetFreeSpace(&state, page) >= state.sizeOfBloomTuple &&
countPage < BloomMetaBlockN)
notFullPage[countPage++] = blkno;
/* Did we delete something? */
if (itupPtr != itup)
{
/* Is it empty page now? */
if (BloomPageGetMaxOffset(page) == 0)
BloomPageSetDeleted(page);
/* Adjust pg_lower */
((PageHeader) page)->pd_lower = (Pointer) itupPtr - page;
/* Finish WAL-logging */
GenericXLogFinish(gxlogState);
}
else
{
/* Didn't change anything: abort WAL-logging */
GenericXLogAbort(gxlogState);
}
UnlockReleaseBuffer(buffer);
}
/*
* Update the metapage's notFullPage list with whatever we found. Our
* info could already be out of date at this point, but blinsert() will
* cope if so.
*/
buffer = ReadBuffer(index, BLOOM_METAPAGE_BLKNO);
LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE);
gxlogState = GenericXLogStart(index);
page = GenericXLogRegisterBuffer(gxlogState, buffer, 0);
metaData = BloomPageGetMeta(page);
memcpy(metaData->notFullPage, notFullPage, sizeof(BlockNumber) * countPage);
metaData->nStart = 0;
metaData->nEnd = countPage;
GenericXLogFinish(gxlogState);
UnlockReleaseBuffer(buffer);
return stats;
}
