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Introduce the concept of relation forks. An smgr relation can now consist

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of multiple forks, and each fork can be created and grown separately.

The bulk of this patch is about changing the smgr API to include an extra
ForkNumber argument in every smgr function. Also, smgrscheduleunlink and
smgrdounlink no longer implicitly call smgrclose, because other forks might
still exist after unlinking one. The callers of those functions have been
modified to call smgrclose instead.

This patch in itself doesn't have any user-visible effect, but provides the
infrastructure needed for upcoming patches. The additional forks envisioned
are a rewritten FSM implementation that doesn't rely on a fixed-size shared
memory block, and a visibility map to allow skipping portions of a table in
VACUUM that have no dead tuples.
This commit is contained in:
Heikki Linnakangas
2008-08-11 11:05:11 +00:00
parent eca1388629
commit 3f0e808c4a
31 changed files with 733 additions and 446 deletions
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12
src/backend/storage/buffer/localbuf.c
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@@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/localbuf.c,v 1.80 2008/06/12 09:12:31 heikki Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/localbuf.c,v 1.81 2008/08/11 11:05:11 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@@ -61,7 +61,8 @@ static Block GetLocalBufferStorage(void);
* (hence, usage_count is always advanced).
*/
BufferDesc *
LocalBufferAlloc(SMgrRelation smgr, BlockNumber blockNum, bool *foundPtr)
LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum, BlockNumber blockNum,
bool *foundPtr)
{
BufferTag newTag; /* identity of requested block */
LocalBufferLookupEnt *hresult;
@@ -70,7 +71,7 @@ LocalBufferAlloc(SMgrRelation smgr, BlockNumber blockNum, bool *foundPtr)
int trycounter;
bool found;
INIT_BUFFERTAG(newTag, smgr->smgr_rnode, blockNum);
INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
/* Initialize local buffers if first request in this session */
if (LocalBufHash == NULL)
@@ -162,6 +163,7 @@ LocalBufferAlloc(SMgrRelation smgr, BlockNumber blockNum, bool *foundPtr)
/* And write... */
smgrwrite(oreln,
bufHdr->tag.forkNum,
bufHdr->tag.blockNum,
(char *) LocalBufHdrGetBlock(bufHdr),
true);
@@ -250,7 +252,8 @@ MarkLocalBufferDirty(Buffer buffer)
* See DropRelFileNodeBuffers in bufmgr.c for more notes.
*/
void
DropRelFileNodeLocalBuffers(RelFileNode rnode, BlockNumber firstDelBlock)
DropRelFileNodeLocalBuffers(RelFileNode rnode, ForkNumber forkNum,
BlockNumber firstDelBlock)
{
int i;
@@ -261,6 +264,7 @@ DropRelFileNodeLocalBuffers(RelFileNode rnode, BlockNumber firstDelBlock)
if ((bufHdr->flags & BM_TAG_VALID) &&
RelFileNodeEquals(bufHdr->tag.rnode, rnode) &&
bufHdr->tag.forkNum == forkNum &&
bufHdr->tag.blockNum >= firstDelBlock)
{
if (LocalRefCount[i] != 0)