mirror of https://github.com/postgres/postgres
Further work on connecting the free space map (which is still just a
stub) into the rest of the system. Adopt a cleaner approach to preventing deadlock in concurrent heap_updates: allow RelationGetBufferForTuple to select any page of the rel, and put the onus on it to lock both buffers in a consistent order. Remove no-longer-needed isExtend hack from API of ReleaseAndReadBuffer.
This commit is contained in:
Tom Lane
parent
0eab92c0e6
commit
af5ced9cfd
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.120 2001/06/27 23:31:38 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.121 2001/06/29 21:08:23 tgl Exp $
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*
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*
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* INTERFACE ROUTINES
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@ -202,8 +202,7 @@ heapgettup(Relation relation,
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*buffer = ReleaseAndReadBuffer(*buffer,
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relation,
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ItemPointerGetBlockNumber(tid),
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false);
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ItemPointerGetBlockNumber(tid));
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if (!BufferIsValid(*buffer))
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elog(ERROR, "heapgettup: failed ReadBuffer");
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@ -238,8 +237,7 @@ heapgettup(Relation relation,
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*buffer = ReleaseAndReadBuffer(*buffer,
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relation,
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page,
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false);
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page);
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if (!BufferIsValid(*buffer))
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elog(ERROR, "heapgettup: failed ReadBuffer");
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@ -280,8 +278,7 @@ heapgettup(Relation relation,
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*buffer = ReleaseAndReadBuffer(*buffer,
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relation,
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page,
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false);
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page);
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if (!BufferIsValid(*buffer))
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elog(ERROR, "heapgettup: failed ReadBuffer");
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@ -374,8 +371,7 @@ heapgettup(Relation relation,
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*buffer = ReleaseAndReadBuffer(*buffer,
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relation,
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page,
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false);
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page);
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if (!BufferIsValid(*buffer))
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elog(ERROR, "heapgettup: failed ReadBuffer");
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@ -1088,8 +1084,8 @@ heap_insert(Relation relation, HeapTuple tup)
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heap_tuple_toast_attrs(relation, tup, NULL);
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#endif
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/* Find buffer for this tuple */
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buffer = RelationGetBufferForTuple(relation, tup->t_len, 0);
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/* Find buffer to insert this tuple into */
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buffer = RelationGetBufferForTuple(relation, tup->t_len, InvalidBuffer);
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/* NO ELOG(ERROR) from here till changes are logged */
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START_CRIT_SECTION();
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@ -1501,18 +1497,16 @@ l2:
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* buffer locks on both old and new pages. To avoid deadlock against
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* some other backend trying to get the same two locks in the other
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* order, we must be consistent about the order we get the locks in.
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* We use the rule "lock the higher-numbered page of the relation
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* We use the rule "lock the lower-numbered page of the relation
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* first". To implement this, we must do RelationGetBufferForTuple
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* while not holding the lock on the old page, and we must tell it
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* to give us a page beyond the old page.
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* while not holding the lock on the old page, and we must rely on it
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* to get the locks on both pages in the correct order.
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*/
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if (newtupsize > pagefree)
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{
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/* Assume there's no chance to put newtup on same page. */
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newbuf = RelationGetBufferForTuple(relation, newtup->t_len,
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BufferGetBlockNumber(buffer) + 1);
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/* Now reacquire lock on old tuple's page. */
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LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE);
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buffer);
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}
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else
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{
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@ -1529,8 +1523,7 @@ l2:
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*/
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LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
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newbuf = RelationGetBufferForTuple(relation, newtup->t_len,
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BufferGetBlockNumber(buffer) + 1);
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LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE);
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buffer);
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}
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else
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{
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@ -1550,7 +1543,8 @@ l2:
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/*
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* At this point newbuf and buffer are both pinned and locked,
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* and newbuf has enough space for the new tuple.
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* and newbuf has enough space for the new tuple. If they are
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* the same buffer, only one pin is held.
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*/
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/* NO ELOG(ERROR) from here till changes are logged */
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Id: hio.c,v 1.40 2001/06/27 23:31:38 tgl Exp $
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* $Id: hio.c,v 1.41 2001/06/29 21:08:23 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -17,6 +17,8 @@
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#include "access/heapam.h"
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#include "access/hio.h"
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#include "storage/freespace.h"
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/*
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* RelationPutHeapTuple - place tuple at specified page
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@ -66,16 +68,29 @@ RelationPutHeapTuple(Relation relation,
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/*
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* RelationGetBufferForTuple
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*
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* Returns exclusive-locked buffer with free space >= given len,
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* being careful to select only a page at or beyond minblocknum
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* in the relation.
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* Returns pinned and exclusive-locked buffer of a page in given relation
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* with free space >= given len.
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*
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* The minblocknum parameter is needed to prevent deadlock between
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* concurrent heap_update operations; see heap_update for details.
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* Pass zero if you don't particularly care which page you get.
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* If otherBuffer is not InvalidBuffer, then it references a previously
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* pinned buffer of another page in the same relation; on return, this
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* buffer will also be exclusive-locked. (This case is used by heap_update;
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* the otherBuffer contains the tuple being updated.)
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*
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* Note that we use LockPage to lock relation for extension. We can
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* do this as long as in all other places we use page-level locking
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* The reason for passing otherBuffer is that if two backends are doing
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* concurrent heap_update operations, a deadlock could occur if they try
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* to lock the same two buffers in opposite orders. To ensure that this
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* can't happen, we impose the rule that buffers of a relation must be
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* locked in increasing page number order. This is most conveniently done
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* by having RelationGetBufferForTuple lock them both, with suitable care
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* for ordering.
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*
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* NOTE: it is unlikely, but not quite impossible, for otherBuffer to be the
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* same buffer we select for insertion of the new tuple (this could only
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* happen if space is freed in that page after heap_update finds there's not
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* enough there). In that case, the page will be pinned and locked only once.
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*
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* Note that we use LockPage(rel, 0) to lock relation for extension.
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* We can do this as long as in all other places we use page-level locking
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* for indices only. Alternatively, we could define pseudo-table as
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* we do for transactions with XactLockTable.
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*
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@ -84,12 +99,13 @@ RelationPutHeapTuple(Relation relation,
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*/
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Buffer
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RelationGetBufferForTuple(Relation relation, Size len,
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BlockNumber minblocknum)
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Buffer otherBuffer)
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{
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Buffer buffer = InvalidBuffer;
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Page pageHeader;
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BlockNumber lastblock,
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oldnblocks;
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Size pageFreeSpace;
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BlockNumber targetBlock,
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otherBlock;
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len = MAXALIGN(len); /* be conservative */
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@ -100,36 +116,118 @@ RelationGetBufferForTuple(Relation relation, Size len,
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elog(ERROR, "Tuple is too big: size %lu, max size %ld",
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(unsigned long) len, MaxTupleSize);
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if (otherBuffer != InvalidBuffer)
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otherBlock = BufferGetBlockNumber(otherBuffer);
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else
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otherBlock = InvalidBlockNumber; /* just to keep compiler quiet */
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/*
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* First, use relcache's record of table length to guess where the
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* last page is, and try to put the tuple there. This cached value
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* may be out of date, in which case we'll be inserting into a non-last
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* page, but that should be OK. Note that in a newly created relcache
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* entry, rd_nblocks may be zero; if so, we'll set it correctly below.
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* We first try to put the tuple on the same page we last inserted a
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* tuple on, as cached in the relcache entry. If that doesn't work,
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* we ask the shared Free Space Map to locate a suitable page. Since
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* the FSM's info might be out of date, we have to be prepared to loop
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* around and retry multiple times. (To insure this isn't an infinite
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* loop, we must update the FSM with the correct amount of free space on
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* each page that proves not to be suitable.) If the FSM has no record of
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* a page with enough free space, we give up and extend the relation.
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*/
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if (relation->rd_nblocks > 0)
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targetBlock = relation->rd_targblock;
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if (targetBlock == InvalidBlockNumber)
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{
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lastblock = relation->rd_nblocks - 1;
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if (lastblock >= minblocknum)
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/*
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* We have no cached target page, so ask the FSM for an initial
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* target.
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*/
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targetBlock = GetPageWithFreeSpace(&relation->rd_node, len);
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/*
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* If the FSM knows nothing of the rel, try the last page before
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* we give up and extend. This avoids one-tuple-per-page syndrome
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* during bootstrapping or in a recently-started system.
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*/
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if (targetBlock == InvalidBlockNumber)
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{
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buffer = ReadBuffer(relation, lastblock);
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LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE);
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pageHeader = (Page) BufferGetPage(buffer);
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if (len <= PageGetFreeSpace(pageHeader))
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return buffer;
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/*
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* Doesn't fit, so we'll have to try someplace else.
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*/
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LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
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/* buffer release will happen below... */
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BlockNumber nblocks = RelationGetNumberOfBlocks(relation);
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if (nblocks > 0)
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targetBlock = nblocks - 1;
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}
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}
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while (targetBlock != InvalidBlockNumber)
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{
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/*
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* Read and exclusive-lock the target block, as well as the
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* other block if one was given, taking suitable care with
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* lock ordering and the possibility they are the same block.
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*/
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if (otherBuffer == InvalidBuffer)
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{
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/* easy case */
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buffer = ReadBuffer(relation, targetBlock);
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LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE);
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}
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else if (otherBlock == targetBlock)
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{
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/* also easy case */
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buffer = otherBuffer;
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LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE);
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}
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else if (otherBlock < targetBlock)
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{
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/* lock other buffer first */
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buffer = ReadBuffer(relation, targetBlock);
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LockBuffer(otherBuffer, BUFFER_LOCK_EXCLUSIVE);
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LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE);
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}
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else
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{
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/* lock target buffer first */
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buffer = ReadBuffer(relation, targetBlock);
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LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE);
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LockBuffer(otherBuffer, BUFFER_LOCK_EXCLUSIVE);
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}
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/*
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* Now we can check to see if there's enough free space here.
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* If so, we're done.
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*/
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pageHeader = (Page) BufferGetPage(buffer);
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pageFreeSpace = PageGetFreeSpace(pageHeader);
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if (len <= pageFreeSpace)
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{
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/* use this page as future insert target, too */
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relation->rd_targblock = targetBlock;
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return buffer;
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}
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/*
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* Not enough space, so we must give up our page locks and
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* pin (if any) and prepare to look elsewhere. We don't care
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* which order we unlock the two buffers in, so this can be
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* slightly simpler than the code above.
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*/
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LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
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if (otherBuffer == InvalidBuffer)
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{
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ReleaseBuffer(buffer);
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}
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else if (otherBlock != targetBlock)
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{
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LockBuffer(otherBuffer, BUFFER_LOCK_UNLOCK);
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ReleaseBuffer(buffer);
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}
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/*
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* Update FSM as to condition of this page, and ask for another
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* page to try.
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*/
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targetBlock = RecordAndGetPageWithFreeSpace(&relation->rd_node,
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targetBlock,
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pageFreeSpace,
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len);
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}
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/*
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* Before extending relation, make sure no one else has done
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* so more recently than our last rd_nblocks update. (If we
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* blindly extend the relation here, then probably most of the
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* page the other guy added will end up going to waste.)
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* Have to extend the relation.
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*
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* We have to use a lock to ensure no one else is extending the
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* rel at the same time, else we will both try to initialize the
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@ -138,51 +236,27 @@ RelationGetBufferForTuple(Relation relation, Size len,
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if (!relation->rd_myxactonly)
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LockPage(relation, 0, ExclusiveLock);
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oldnblocks = relation->rd_nblocks;
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/*
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* XXX This does an lseek - rather expensive - but at the moment it is
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* the only way to accurately determine how many blocks are in a
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* relation. Is it worth keeping an accurate file length in shared
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* memory someplace, rather than relying on the kernel to do it for us?
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*/
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relation->rd_nblocks = RelationGetNumberOfBlocks(relation);
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if (relation->rd_nblocks > oldnblocks)
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{
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/*
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* Someone else has indeed extended the relation recently.
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* Try to fit our tuple into the new last page.
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*/
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lastblock = relation->rd_nblocks - 1;
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if (lastblock >= minblocknum)
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{
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buffer = ReleaseAndReadBuffer(buffer, relation, lastblock, false);
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LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE);
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pageHeader = (Page) BufferGetPage(buffer);
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if (len <= PageGetFreeSpace(pageHeader))
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{
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/* OK, we don't need to extend again. */
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if (!relation->rd_myxactonly)
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UnlockPage(relation, 0, ExclusiveLock);
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return buffer;
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}
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/*
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* Doesn't fit, so we'll have to extend the relation (again).
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*/
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LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
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/* buffer release will happen below... */
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}
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}
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buffer = ReadBuffer(relation, P_NEW);
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/*
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* Extend the relation by one page and update rd_nblocks for next time.
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*
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* Note: at this point minblocknum is ignored; we won't extend by more
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* than one block...
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* Release the file-extension lock; it's now OK for someone else
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* to extend the relation some more.
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*/
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lastblock = relation->rd_nblocks;
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buffer = ReleaseAndReadBuffer(buffer, relation, lastblock, true);
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relation->rd_nblocks = lastblock + 1;
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if (!relation->rd_myxactonly)
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UnlockPage(relation, 0, ExclusiveLock);
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/*
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* We can be certain that locking the otherBuffer first is OK,
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* since it must have a lower page number.
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*/
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if (otherBuffer != InvalidBuffer)
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LockBuffer(otherBuffer, BUFFER_LOCK_EXCLUSIVE);
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/*
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* We need to initialize the empty new page.
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@ -192,19 +266,22 @@ RelationGetBufferForTuple(Relation relation, Size len,
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Assert(PageIsNew((PageHeader) pageHeader));
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PageInit(pageHeader, BufferGetPageSize(buffer), 0);
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/*
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* Release the file-extension lock; it's now OK for someone else
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* to extend the relation some more.
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*/
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if (!relation->rd_myxactonly)
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UnlockPage(relation, 0, ExclusiveLock);
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if (len > PageGetFreeSpace(pageHeader))
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{
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/* We should not get here given the test at the top */
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elog(STOP, "Tuple is too big: size %lu",
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(unsigned long) len);
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elog(STOP, "Tuple is too big: size %lu", (unsigned long) len);
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}
|
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|
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/*
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* Remember the new page as our target for future insertions.
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*
|
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* XXX should we enter the new page into the free space map immediately,
|
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* or just keep it for this backend's exclusive use in the short run
|
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* (until VACUUM sees it)? Seems to depend on whether you expect the
|
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* current backend to make more insertions or not, which is probably a
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* good bet most of the time. So for now, don't add it to FSM yet.
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*/
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relation->rd_targblock = BufferGetBlockNumber(buffer);
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|
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return buffer;
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}
|
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|
|
|
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|
|
@ -6,7 +6,7 @@
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
|
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* Portions Copyright (c) 1994, Regents of the University of California
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*
|
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* $Header: /cvsroot/pgsql/src/backend/access/transam/xlogutils.c,v 1.15 2001/03/22 03:59:18 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/access/transam/xlogutils.c,v 1.16 2001/06/29 21:08:24 tgl Exp $
|
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*
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*-------------------------------------------------------------------------
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*/
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@ -171,6 +171,7 @@ XLogOpenLogRelation(void)
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sprintf(RelationGetPhysicalRelationName(logRelation), "pg_log");
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logRelation->rd_node.tblNode = InvalidOid;
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logRelation->rd_node.relNode = RelOid_pg_log;
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logRelation->rd_targblock = InvalidBlockNumber;
|
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logRelation->rd_fd = -1;
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logRelation->rd_fd = smgropen(DEFAULT_SMGR, logRelation, false);
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if (logRelation->rd_fd < 0)
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|
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@ -384,6 +385,7 @@ XLogOpenRelation(bool redo, RmgrId rmid, RelFileNode rnode)
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|||
|
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hentry->rdesc = res;
|
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|
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res->reldata.rd_targblock = InvalidBlockNumber;
|
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res->reldata.rd_fd = -1;
|
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res->reldata.rd_fd = smgropen(DEFAULT_SMGR, &(res->reldata),
|
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true /* allow failure */ );
|
||||
|
|
|
|||
|
|
@ -8,7 +8,7 @@
|
|||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $Header: /cvsroot/pgsql/src/backend/catalog/heap.c,v 1.169 2001/06/27 23:31:38 tgl Exp $
|
||||
* $Header: /cvsroot/pgsql/src/backend/catalog/heap.c,v 1.170 2001/06/29 21:08:24 tgl Exp $
|
||||
*
|
||||
*
|
||||
* INTERFACE ROUTINES
|
||||
|
|
@ -39,7 +39,6 @@
|
|||
#include "catalog/pg_attrdef.h"
|
||||
#include "catalog/pg_inherits.h"
|
||||
#include "catalog/pg_index.h"
|
||||
#include "catalog/pg_proc.h"
|
||||
#include "catalog/pg_relcheck.h"
|
||||
#include "catalog/pg_statistic.h"
|
||||
#include "catalog/pg_type.h"
|
||||
|
|
@ -50,8 +49,6 @@
|
|||
#include "optimizer/planmain.h"
|
||||
#include "optimizer/prep.h"
|
||||
#include "optimizer/var.h"
|
||||
#include "nodes/makefuncs.h"
|
||||
#include "parser/parse_clause.h"
|
||||
#include "parser/parse_expr.h"
|
||||
#include "parser/parse_relation.h"
|
||||
#include "parser/parse_target.h"
|
||||
|
|
@ -59,7 +56,6 @@
|
|||
#include "rewrite/rewriteRemove.h"
|
||||
#include "storage/smgr.h"
|
||||
#include "utils/builtins.h"
|
||||
#include "utils/catcache.h"
|
||||
#include "utils/fmgroids.h"
|
||||
#include "utils/lsyscache.h"
|
||||
#include "utils/relcache.h"
|
||||
|
|
@ -197,25 +193,18 @@ heap_create(char *relname,
|
|||
static unsigned int uniqueId = 0;
|
||||
|
||||
Oid relid;
|
||||
Relation rel;
|
||||
bool nailme = false;
|
||||
int natts = tupDesc->natts;
|
||||
int i;
|
||||
MemoryContext oldcxt;
|
||||
Oid tblNode = MyDatabaseId;
|
||||
bool nailme = false;
|
||||
Relation rel;
|
||||
|
||||
/*
|
||||
* sanity checks
|
||||
*/
|
||||
AssertArg(natts > 0);
|
||||
|
||||
if (relname && !allow_system_table_mods &&
|
||||
IsSystemRelationName(relname) && IsNormalProcessingMode())
|
||||
{
|
||||
elog(ERROR, "Illegal class name '%s'"
|
||||
"\n\tThe 'pg_' name prefix is reserved for system catalogs",
|
||||
relname);
|
||||
}
|
||||
|
||||
/*
|
||||
* Real ugly stuff to assign the proper relid in the relation
|
||||
|
|
@ -276,70 +265,20 @@ heap_create(char *relname,
|
|||
|
||||
if (istemp)
|
||||
{
|
||||
|
||||
/*
|
||||
* replace relname of caller with a unique name for a temp
|
||||
* relation
|
||||
*/
|
||||
snprintf(relname, NAMEDATALEN, "%s_%d_%u",
|
||||
PG_TEMP_REL_PREFIX, (int) MyProcPid, uniqueId++);
|
||||
PG_TEMP_REL_PREFIX, (int) MyProcPid, uniqueId++);
|
||||
}
|
||||
|
||||
/*
|
||||
* switch to the cache context to create the relcache entry.
|
||||
* build the relcache entry.
|
||||
*/
|
||||
if (!CacheMemoryContext)
|
||||
CreateCacheMemoryContext();
|
||||
|
||||
oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
|
||||
|
||||
/*
|
||||
* allocate a new relation descriptor.
|
||||
*/
|
||||
rel = (Relation) palloc(sizeof(RelationData));
|
||||
MemSet((char *) rel, 0, sizeof(RelationData));
|
||||
rel->rd_fd = -1; /* physical file is not open */
|
||||
|
||||
RelationSetReferenceCount(rel, 1);
|
||||
|
||||
/*
|
||||
* create a new tuple descriptor from the one passed in
|
||||
*/
|
||||
rel->rd_att = CreateTupleDescCopyConstr(tupDesc);
|
||||
|
||||
/*
|
||||
* nail the reldesc if this is a bootstrap create reln and we may need
|
||||
* it in the cache later on in the bootstrap process so we don't ever
|
||||
* want it kicked out. e.g. pg_attribute!!!
|
||||
*/
|
||||
if (nailme)
|
||||
rel->rd_isnailed = true;
|
||||
|
||||
/*
|
||||
* initialize the fields of our new relation descriptor
|
||||
*/
|
||||
rel->rd_rel = (Form_pg_class) palloc(sizeof *rel->rd_rel);
|
||||
MemSet((char *) rel->rd_rel, 0, sizeof *rel->rd_rel);
|
||||
strcpy(RelationGetPhysicalRelationName(rel), relname);
|
||||
rel->rd_rel->relkind = RELKIND_UNCATALOGED;
|
||||
rel->rd_rel->relnatts = natts;
|
||||
rel->rd_rel->reltype = InvalidOid;
|
||||
if (tupDesc->constr)
|
||||
rel->rd_rel->relchecks = tupDesc->constr->num_check;
|
||||
|
||||
for (i = 0; i < natts; i++)
|
||||
rel->rd_att->attrs[i]->attrelid = relid;
|
||||
|
||||
RelationGetRelid(rel) = relid;
|
||||
|
||||
rel->rd_node.tblNode = tblNode;
|
||||
rel->rd_node.relNode = relid;
|
||||
rel->rd_rel->relfilenode = relid;
|
||||
|
||||
/*
|
||||
* done building relcache entry.
|
||||
*/
|
||||
MemoryContextSwitchTo(oldcxt);
|
||||
rel = RelationBuildLocalRelation(relname, tupDesc,
|
||||
relid, tblNode,
|
||||
nailme);
|
||||
|
||||
/*
|
||||
* have the storage manager create the relation.
|
||||
|
|
@ -347,8 +286,6 @@ heap_create(char *relname,
|
|||
if (storage_create)
|
||||
heap_storage_create(rel);
|
||||
|
||||
RelationRegisterRelation(rel);
|
||||
|
||||
return rel;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -8,7 +8,7 @@
|
|||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $Header: /cvsroot/pgsql/src/backend/commands/sequence.c,v 1.60 2001/06/23 00:07:34 momjian Exp $
|
||||
* $Header: /cvsroot/pgsql/src/backend/commands/sequence.c,v 1.61 2001/06/29 21:08:24 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -168,21 +168,26 @@ DefineSequence(CreateSeqStmt *seq)
|
|||
DefineRelation(stmt, RELKIND_SEQUENCE);
|
||||
|
||||
rel = heap_openr(seq->seqname, AccessExclusiveLock);
|
||||
|
||||
tupDesc = RelationGetDescr(rel);
|
||||
|
||||
Assert(RelationGetNumberOfBlocks(rel) == 0);
|
||||
/* Initialize first page of relation with special magic number */
|
||||
|
||||
buf = ReadBuffer(rel, P_NEW);
|
||||
|
||||
if (!BufferIsValid(buf))
|
||||
elog(ERROR, "DefineSequence: ReadBuffer failed");
|
||||
|
||||
Assert(BufferGetBlockNumber(buf) == 0);
|
||||
|
||||
page = (PageHeader) BufferGetPage(buf);
|
||||
|
||||
PageInit((Page) page, BufferGetPageSize(buf), sizeof(sequence_magic));
|
||||
sm = (sequence_magic *) PageGetSpecialPointer(page);
|
||||
sm->magic = SEQ_MAGIC;
|
||||
|
||||
/* hack: ensure heap_insert will insert on the just-created page */
|
||||
rel->rd_targblock = 0;
|
||||
|
||||
/* Now - form & insert sequence tuple */
|
||||
tuple = heap_formtuple(tupDesc, value, null);
|
||||
heap_insert(rel, tuple);
|
||||
|
|
|
|||
|
|
@ -8,7 +8,7 @@
|
|||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/bufmgr.c,v 1.113 2001/06/22 19:16:22 wieck Exp $
|
||||
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/bufmgr.c,v 1.114 2001/06/29 21:08:24 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -91,7 +91,7 @@ extern void AbortBufferIO(void);
|
|||
#define BUFFER_IS_BROKEN(buf) ((buf->flags & BM_IO_ERROR) && !(buf->flags & BM_DIRTY))
|
||||
|
||||
static Buffer ReadBufferInternal(Relation reln, BlockNumber blockNum,
|
||||
bool isExtend, bool bufferLockHeld);
|
||||
bool bufferLockHeld);
|
||||
static BufferDesc *BufferAlloc(Relation reln, BlockNumber blockNum,
|
||||
bool *foundPtr);
|
||||
static int ReleaseBufferWithBufferLock(Buffer buffer);
|
||||
|
|
@ -103,7 +103,9 @@ void PrintBufferDescs(void);
|
|||
* ReadBuffer -- returns a buffer containing the requested
|
||||
* block of the requested relation. If the blknum
|
||||
* requested is P_NEW, extend the relation file and
|
||||
* allocate a new block.
|
||||
* allocate a new block. (Caller is responsible for
|
||||
* ensuring that only one backend tries to extend a
|
||||
* relation at the same time!)
|
||||
*
|
||||
* Returns: the buffer number for the buffer containing
|
||||
* the block read, or NULL on an error. If successful,
|
||||
|
|
@ -111,6 +113,8 @@ void PrintBufferDescs(void);
|
|||
*
|
||||
* Assume when this function is called, that reln has been
|
||||
* opened already.
|
||||
*
|
||||
* Note: a side effect of a P_NEW call is to update reln->rd_nblocks.
|
||||
*/
|
||||
|
||||
#undef ReadBuffer /* conflicts with macro when BUFMGR_DEBUG
|
||||
|
|
@ -122,28 +126,26 @@ void PrintBufferDescs(void);
|
|||
Buffer
|
||||
ReadBuffer(Relation reln, BlockNumber blockNum)
|
||||
{
|
||||
return ReadBufferInternal(reln, blockNum, false, false);
|
||||
return ReadBufferInternal(reln, blockNum, false);
|
||||
}
|
||||
|
||||
/*
|
||||
* ReadBufferInternal -- internal version of ReadBuffer with more options
|
||||
*
|
||||
* isExtend: if true, assume that we are extending the file and the caller
|
||||
* is passing the current EOF block number (ie, caller already called
|
||||
* smgrnblocks()).
|
||||
*
|
||||
* bufferLockHeld: if true, caller already acquired the bufmgr spinlock.
|
||||
* (This is assumed never to be true if dealing with a local buffer!)
|
||||
*/
|
||||
static Buffer
|
||||
ReadBufferInternal(Relation reln, BlockNumber blockNum,
|
||||
bool isExtend, bool bufferLockHeld)
|
||||
bool bufferLockHeld)
|
||||
{
|
||||
BufferDesc *bufHdr;
|
||||
int status;
|
||||
bool found;
|
||||
bool isExtend;
|
||||
bool isLocalBuf;
|
||||
|
||||
isExtend = (blockNum == P_NEW);
|
||||
isLocalBuf = reln->rd_myxactonly;
|
||||
|
||||
if (isLocalBuf)
|
||||
|
|
@ -151,11 +153,10 @@ ReadBufferInternal(Relation reln, BlockNumber blockNum,
|
|||
ReadLocalBufferCount++;
|
||||
pgstat_count_buffer_read(&reln->pgstat_info, reln);
|
||||
/* Substitute proper block number if caller asked for P_NEW */
|
||||
if (blockNum == P_NEW)
|
||||
if (isExtend)
|
||||
{
|
||||
blockNum = reln->rd_nblocks;
|
||||
reln->rd_nblocks++;
|
||||
isExtend = true;
|
||||
}
|
||||
bufHdr = LocalBufferAlloc(reln, blockNum, &found);
|
||||
if (found)
|
||||
|
|
@ -169,10 +170,11 @@ ReadBufferInternal(Relation reln, BlockNumber blockNum,
|
|||
ReadBufferCount++;
|
||||
pgstat_count_buffer_read(&reln->pgstat_info, reln);
|
||||
/* Substitute proper block number if caller asked for P_NEW */
|
||||
if (blockNum == P_NEW)
|
||||
if (isExtend)
|
||||
{
|
||||
blockNum = smgrnblocks(DEFAULT_SMGR, reln);
|
||||
isExtend = true;
|
||||
/* must be sure we have accurate file length! */
|
||||
blockNum = reln->rd_nblocks = smgrnblocks(DEFAULT_SMGR, reln);
|
||||
reln->rd_nblocks++;
|
||||
}
|
||||
/*
|
||||
* lookup the buffer. IO_IN_PROGRESS is set if the requested
|
||||
|
|
@ -649,26 +651,24 @@ WriteNoReleaseBuffer(Buffer buffer)
|
|||
* ReleaseAndReadBuffer -- combine ReleaseBuffer() and ReadBuffer()
|
||||
* to save a spinlock release/acquire.
|
||||
*
|
||||
* An additional frammish of this routine is that the caller may perform
|
||||
* file extension (as if blockNum = P_NEW) by passing the actual current
|
||||
* EOF block number as blockNum and setting isExtend true. This hack
|
||||
* allows us to avoid calling smgrnblocks() again when the caller has
|
||||
* already done it.
|
||||
*
|
||||
* Note: it is OK to pass buffer = InvalidBuffer, indicating that no old
|
||||
* buffer actually needs to be released. This case is the same as ReadBuffer
|
||||
* except for the isExtend option.
|
||||
*
|
||||
* Also, if the passed buffer is valid and already contains the desired block
|
||||
* number, we simply return it without ever acquiring the spinlock at all.
|
||||
* Since the passed buffer must be pinned, it's OK to examine its block
|
||||
* number without getting the lock first.
|
||||
*
|
||||
* Note: it is OK to pass buffer = InvalidBuffer, indicating that no old
|
||||
* buffer actually needs to be released. This case is the same as ReadBuffer,
|
||||
* but can save some tests in the caller.
|
||||
*
|
||||
* Also note: while it will work to call this routine with blockNum == P_NEW,
|
||||
* it's best to avoid doing so, since that would result in calling
|
||||
* smgrnblocks() while holding the bufmgr spinlock, hence some loss of
|
||||
* concurrency.
|
||||
*/
|
||||
Buffer
|
||||
ReleaseAndReadBuffer(Buffer buffer,
|
||||
Relation relation,
|
||||
BlockNumber blockNum,
|
||||
bool isExtend)
|
||||
BlockNumber blockNum)
|
||||
{
|
||||
BufferDesc *bufHdr;
|
||||
|
||||
|
|
@ -703,14 +703,12 @@ ReleaseAndReadBuffer(Buffer buffer,
|
|||
AddBufferToFreelist(bufHdr);
|
||||
bufHdr->flags |= BM_FREE;
|
||||
}
|
||||
return ReadBufferInternal(relation, blockNum,
|
||||
isExtend, true);
|
||||
return ReadBufferInternal(relation, blockNum, true);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return ReadBufferInternal(relation, blockNum,
|
||||
isExtend, false);
|
||||
return ReadBufferInternal(relation, blockNum, false);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -1738,14 +1736,13 @@ ReleaseAndReadBuffer_Debug(char *file,
|
|||
int line,
|
||||
Buffer buffer,
|
||||
Relation relation,
|
||||
BlockNumber blockNum,
|
||||
bool isExtend)
|
||||
BlockNumber blockNum)
|
||||
{
|
||||
bool bufferValid;
|
||||
Buffer b;
|
||||
|
||||
bufferValid = BufferIsValid(buffer);
|
||||
b = ReleaseAndReadBuffer(buffer, relation, blockNum, isExtend);
|
||||
b = ReleaseAndReadBuffer(buffer, relation, blockNum);
|
||||
if (ShowPinTrace && bufferValid && BufferIsLocal(buffer)
|
||||
&& is_userbuffer(buffer))
|
||||
{
|
||||
|
|
|
|||
|
|
@ -8,7 +8,7 @@
|
|||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $Header: /cvsroot/pgsql/src/backend/storage/freespace/freespace.c,v 1.1 2001/06/27 23:31:39 tgl Exp $
|
||||
* $Header: /cvsroot/pgsql/src/backend/storage/freespace/freespace.c,v 1.2 2001/06/29 21:08:24 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -161,10 +161,42 @@ FreeSpaceShmemSize(void)
|
|||
return size;
|
||||
}
|
||||
|
||||
BlockNumber
|
||||
GetPageWithFreeSpace(RelFileNode *rel, Size spaceNeeded)
|
||||
{
|
||||
return InvalidBlockNumber; /* stub */
|
||||
}
|
||||
|
||||
void
|
||||
RecordFreeSpace(RelFileNode *rel, BlockNumber page, Size spaceAvail)
|
||||
{
|
||||
/* stub */
|
||||
}
|
||||
|
||||
BlockNumber
|
||||
RecordAndGetPageWithFreeSpace(RelFileNode *rel,
|
||||
BlockNumber oldPage,
|
||||
Size oldSpaceAvail,
|
||||
Size spaceNeeded)
|
||||
{
|
||||
return InvalidBlockNumber; /* stub */
|
||||
}
|
||||
|
||||
void
|
||||
MultiRecordFreeSpace(RelFileNode *rel,
|
||||
BlockNumber minPage,
|
||||
BlockNumber maxPage,
|
||||
int nPages,
|
||||
BlockNumber *pages,
|
||||
Size *spaceAvail)
|
||||
{
|
||||
/* stub */
|
||||
}
|
||||
|
||||
void
|
||||
FreeSpaceMapForgetRel(RelFileNode *rel)
|
||||
{
|
||||
/* stub */
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -178,6 +210,7 @@ FreeSpaceMapForgetRel(RelFileNode *rel)
|
|||
void
|
||||
DumpFreeSpace(void)
|
||||
{
|
||||
/* stub */
|
||||
}
|
||||
|
||||
#endif /* FREESPACE_DEBUG */
|
||||
|
|
|
|||
|
|
@ -11,7 +11,7 @@
|
|||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $Header: /cvsroot/pgsql/src/backend/storage/smgr/smgr.c,v 1.50 2001/06/27 23:31:39 tgl Exp $
|
||||
* $Header: /cvsroot/pgsql/src/backend/storage/smgr/smgr.c,v 1.51 2001/06/29 21:08:24 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -437,7 +437,20 @@ smgrblindmarkdirty(int16 which,
|
|||
BlockNumber
|
||||
smgrnblocks(int16 which, Relation reln)
|
||||
{
|
||||
return (*(smgrsw[which].smgr_nblocks)) (reln);
|
||||
BlockNumber nblocks;
|
||||
|
||||
nblocks = (*(smgrsw[which].smgr_nblocks)) (reln);
|
||||
/*
|
||||
* NOTE: if a relation ever did grow to 2^32-1 blocks, this code would
|
||||
* fail --- but that's a good thing, because it would stop us from
|
||||
* extending the rel another block and having a block whose number
|
||||
* actually is InvalidBlockNumber.
|
||||
*/
|
||||
if (nblocks == InvalidBlockNumber)
|
||||
elog(ERROR, "cannot count blocks for %s: %m",
|
||||
RelationGetRelationName(reln));
|
||||
|
||||
return nblocks;
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
|
|||
|
|
@ -8,7 +8,7 @@
|
|||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $Header: /cvsroot/pgsql/src/backend/utils/cache/relcache.c,v 1.140 2001/06/27 23:31:39 tgl Exp $
|
||||
* $Header: /cvsroot/pgsql/src/backend/utils/cache/relcache.c,v 1.141 2001/06/29 21:08:25 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -1928,33 +1928,111 @@ RelationCacheAbortWalker(Relation *relationPtr, Datum dummy)
|
|||
}
|
||||
|
||||
/*
|
||||
* RelationRegisterRelation -
|
||||
* register the Relation descriptor of a newly created relation
|
||||
* with the relation descriptor Cache.
|
||||
* RelationBuildLocalRelation
|
||||
* Build a relcache entry for an about-to-be-created relation,
|
||||
* and enter it into the relcache.
|
||||
*/
|
||||
void
|
||||
RelationRegisterRelation(Relation relation)
|
||||
Relation
|
||||
RelationBuildLocalRelation(const char *relname,
|
||||
TupleDesc tupDesc,
|
||||
Oid relid, Oid dbid,
|
||||
bool nailit)
|
||||
{
|
||||
Relation rel;
|
||||
MemoryContext oldcxt;
|
||||
int natts = tupDesc->natts;
|
||||
int i;
|
||||
|
||||
RelationInitLockInfo(relation);
|
||||
AssertArg(natts > 0);
|
||||
|
||||
/*
|
||||
* switch to the cache context to create the relcache entry.
|
||||
*/
|
||||
if (!CacheMemoryContext)
|
||||
CreateCacheMemoryContext();
|
||||
|
||||
oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
|
||||
|
||||
RelationCacheInsert(relation);
|
||||
/*
|
||||
* allocate a new relation descriptor.
|
||||
*/
|
||||
rel = (Relation) palloc(sizeof(RelationData));
|
||||
MemSet((char *) rel, 0, sizeof(RelationData));
|
||||
rel->rd_targblock = InvalidBlockNumber;
|
||||
|
||||
/* make sure relation is marked as having no open file yet */
|
||||
rel->rd_fd = -1;
|
||||
|
||||
RelationSetReferenceCount(rel, 1);
|
||||
|
||||
/*
|
||||
* nail the reldesc if this is a bootstrap create reln and we may need
|
||||
* it in the cache later on in the bootstrap process so we don't ever
|
||||
* want it kicked out. e.g. pg_attribute!!!
|
||||
*/
|
||||
if (nailit)
|
||||
rel->rd_isnailed = true;
|
||||
|
||||
/*
|
||||
* create a new tuple descriptor from the one passed in
|
||||
* (we do this to copy it into the cache context)
|
||||
*/
|
||||
rel->rd_att = CreateTupleDescCopyConstr(tupDesc);
|
||||
|
||||
/*
|
||||
* initialize relation tuple form (caller may add/override data later)
|
||||
*/
|
||||
rel->rd_rel = (Form_pg_class) palloc(CLASS_TUPLE_SIZE);
|
||||
MemSet((char *) rel->rd_rel, 0, CLASS_TUPLE_SIZE);
|
||||
|
||||
strcpy(RelationGetPhysicalRelationName(rel), relname);
|
||||
|
||||
rel->rd_rel->relkind = RELKIND_UNCATALOGED;
|
||||
rel->rd_rel->relnatts = natts;
|
||||
rel->rd_rel->reltype = InvalidOid;
|
||||
if (tupDesc->constr)
|
||||
rel->rd_rel->relchecks = tupDesc->constr->num_check;
|
||||
|
||||
/*
|
||||
* Insert relation OID and database/tablespace ID into the right places.
|
||||
* XXX currently we assume physical tblspace/relnode are same as logical
|
||||
* dbid/reloid. Probably should pass an extra pair of parameters.
|
||||
*/
|
||||
rel->rd_rel->relisshared = (dbid == InvalidOid);
|
||||
|
||||
RelationGetRelid(rel) = relid;
|
||||
|
||||
for (i = 0; i < natts; i++)
|
||||
rel->rd_att->attrs[i]->attrelid = relid;
|
||||
|
||||
RelationInitLockInfo(rel); /* see lmgr.c */
|
||||
|
||||
rel->rd_node.tblNode = dbid;
|
||||
rel->rd_node.relNode = relid;
|
||||
rel->rd_rel->relfilenode = relid;
|
||||
|
||||
/*
|
||||
* Okay to insert into the relcache hash tables.
|
||||
*/
|
||||
RelationCacheInsert(rel);
|
||||
|
||||
/*
|
||||
* we've just created the relation. It is invisible to anyone else
|
||||
* before the transaction is committed. Setting rd_myxactonly allows
|
||||
* us to use the local buffer manager for select/insert/etc before the
|
||||
* end of transaction. (We also need to keep track of relations
|
||||
* created during a transaction and does the necessary clean up at the
|
||||
* created during a transaction and do the necessary clean up at the
|
||||
* end of the transaction.) - ay 3/95
|
||||
*/
|
||||
relation->rd_myxactonly = TRUE;
|
||||
newlyCreatedRelns = lcons(relation, newlyCreatedRelns);
|
||||
rel->rd_myxactonly = true;
|
||||
newlyCreatedRelns = lcons(rel, newlyCreatedRelns);
|
||||
|
||||
/*
|
||||
* done building relcache entry.
|
||||
*/
|
||||
MemoryContextSwitchTo(oldcxt);
|
||||
|
||||
return rel;
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -1972,14 +2050,18 @@ RelationPurgeLocalRelation(bool xactCommitted)
|
|||
List *l = newlyCreatedRelns;
|
||||
Relation reln = lfirst(l);
|
||||
|
||||
newlyCreatedRelns = lnext(newlyCreatedRelns);
|
||||
pfree(l);
|
||||
|
||||
Assert(reln != NULL && reln->rd_myxactonly);
|
||||
|
||||
reln->rd_myxactonly = false; /* mark it not on list anymore */
|
||||
|
||||
newlyCreatedRelns = lnext(newlyCreatedRelns);
|
||||
pfree(l);
|
||||
|
||||
/* XXX is this step still needed? If so, why? */
|
||||
/*
|
||||
* XXX while we clearly must throw out new Relation entries at
|
||||
* xact abort, it's not clear why we need to do it at commit.
|
||||
* Could this be improved?
|
||||
*/
|
||||
if (!IsBootstrapProcessingMode())
|
||||
RelationClearRelation(reln, false);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -7,7 +7,7 @@
|
|||
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: hio.h,v 1.18 2001/05/16 22:35:12 tgl Exp $
|
||||
* $Id: hio.h,v 1.19 2001/06/29 21:08:25 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -19,6 +19,6 @@
|
|||
extern void RelationPutHeapTuple(Relation relation, Buffer buffer,
|
||||
HeapTuple tuple);
|
||||
extern Buffer RelationGetBufferForTuple(Relation relation, Size len,
|
||||
BlockNumber minblocknum);
|
||||
Buffer otherBuffer);
|
||||
|
||||
#endif /* HIO_H */
|
||||
|
|
|
|||
|
|
@ -7,7 +7,7 @@
|
|||
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: bufmgr.h,v 1.52 2001/06/09 18:16:59 tgl Exp $
|
||||
* $Id: bufmgr.h,v 1.53 2001/06/29 21:08:25 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -155,10 +155,11 @@ extern long *LocalRefCount;
|
|||
* prototypes for functions in bufmgr.c
|
||||
*/
|
||||
extern Buffer ReadBuffer(Relation reln, BlockNumber blockNum);
|
||||
extern int ReleaseBuffer(Buffer buffer);
|
||||
extern int WriteBuffer(Buffer buffer);
|
||||
extern int WriteNoReleaseBuffer(Buffer buffer);
|
||||
extern Buffer ReleaseAndReadBuffer(Buffer buffer, Relation relation,
|
||||
BlockNumber blockNum, bool isExtend);
|
||||
BlockNumber blockNum);
|
||||
extern int FlushBuffer(Buffer buffer, bool sync, bool release);
|
||||
|
||||
extern void InitBufferPool(void);
|
||||
|
|
@ -176,7 +177,6 @@ extern void DropRelFileNodeBuffers(RelFileNode rnode);
|
|||
extern void DropBuffers(Oid dbid);
|
||||
extern void PrintPinnedBufs(void);
|
||||
extern int BufferShmemSize(void);
|
||||
extern int ReleaseBuffer(Buffer buffer);
|
||||
extern RelFileNode BufferGetFileNode(Buffer buffer);
|
||||
|
||||
extern void SetBufferCommitInfoNeedsSave(Buffer buffer);
|
||||
|
|
|
|||
|
|
@ -7,7 +7,7 @@
|
|||
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: relcache.h,v 1.24 2001/01/24 19:43:29 momjian Exp $
|
||||
* $Id: relcache.h,v 1.25 2001/06/29 21:08:25 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -27,7 +27,6 @@ extern Relation RelationNodeCacheGetRelation(RelFileNode rnode);
|
|||
extern Relation RelationIdCacheGetRelation(Oid relationId);
|
||||
|
||||
extern void RelationClose(Relation relation);
|
||||
extern void RelationForgetRelation(Oid rid);
|
||||
|
||||
/*
|
||||
* Routines to compute/retrieve additional cached information
|
||||
|
|
@ -40,14 +39,23 @@ extern List *RelationGetIndexList(Relation relation);
|
|||
extern void RelationCacheInitialize(void);
|
||||
extern void RelationCacheInitializePhase2(void);
|
||||
|
||||
/*
|
||||
* Routine to create a relcache entry for an about-to-be-created relation
|
||||
*/
|
||||
extern Relation RelationBuildLocalRelation(const char *relname,
|
||||
TupleDesc tupDesc,
|
||||
Oid relid, Oid dbid,
|
||||
bool nailit);
|
||||
|
||||
/*
|
||||
* Routines for flushing/rebuilding relcache entries in various scenarios
|
||||
*/
|
||||
extern void RelationForgetRelation(Oid rid);
|
||||
|
||||
extern void RelationIdInvalidateRelationCacheByRelationId(Oid relationId);
|
||||
|
||||
extern void RelationCacheInvalidate(void);
|
||||
|
||||
extern void RelationRegisterRelation(Relation relation);
|
||||
extern void RelationPurgeLocalRelation(bool xactComitted);
|
||||
|
||||
extern void RelationCacheAbort(void);
|
||||
|
|
|
|||
Loading…
Reference in New Issue