*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/gist/gist.c,v 1.66 2000/11/21 21:15:53 petere Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/gist/gist.c,v 1.67 2000/11/30 08:46:20 vadim Exp $
*
*-------------------------------------------------------------------------
*/
#include "miscadmin.h"
#include "utils/syscache.h"
-#ifdef XLOG
#include "access/xlogutils.h"
-#endif
/* non-export function prototypes */
static InsertIndexResult gistdoinsert(Relation r, IndexTuple itup,
#endif /* defined GISTDEBUG */
-#ifdef XLOG
void
gist_redo(XLogRecPtr lsn, XLogRecord *record)
{
gist_desc(char *buf, uint8 xl_info, char* rec)
{
}
-#endif
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/hash/hash.c,v 1.45 2000/11/21 21:15:54 petere Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/hash/hash.c,v 1.46 2000/11/30 08:46:20 vadim Exp $
*
* NOTES
* This file contains only the public interface routines.
bool BuildingHash = false;
-#ifdef XLOG
#include "access/xlogutils.h"
-#endif
/*
PG_RETURN_VOID();
}
-#ifdef XLOG
void
hash_redo(XLogRecPtr lsn, XLogRecord *record)
{
hash_desc(char *buf, uint8 xl_info, char* rec)
{
}
-#endif
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.96 2000/11/21 21:15:54 petere Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.97 2000/11/30 08:46:20 vadim Exp $
*
*
* INTERFACE ROUTINES
#include "utils/inval.h"
#include "utils/relcache.h"
-#ifdef XLOG
#include "access/xlogutils.h"
XLogRecPtr log_heap_move(Relation reln, ItemPointerData from, HeapTuple newtup);
static void HeapPageCleanup(Buffer buffer);
-#endif
-
/* ----------------------------------------------------------------
* heap support routines
/* NO ELOG(ERROR) from here till changes are logged */
RelationPutHeapTuple(relation, buffer, tup);
-#ifdef XLOG
/* XLOG stuff */
{
xl_heap_insert xlrec;
PageSetLSN(BufferGetPage(buffer), recptr);
PageSetSUI(BufferGetPage(buffer), ThisStartUpID);
}
-#endif
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
WriteBuffer(buffer);
return result;
}
-#ifdef XLOG
/* XLOG stuff */
{
xl_heap_delete xlrec;
PageSetLSN(dp, recptr);
PageSetSUI(dp, ThisStartUpID);
}
-#endif
/* store transaction information of xact deleting the tuple */
TransactionIdStore(GetCurrentTransactionId(), &(tp.t_data->t_xmax));
newbuf = buffer;
else
{
-#ifdef XLOG
/*
* We have to unlock old tuple buffer before extending table
* file but have to keep lock on the old tuple. To avoid second
_locked_tuple_.node = relation->rd_node;
_locked_tuple_.tid = *otid;
XactPushRollback(_heap_unlock_tuple, (void*) &_locked_tuple_);
-#endif
+
TransactionIdStore(GetCurrentTransactionId(), &(oldtup.t_data->t_xmax));
oldtup.t_data->t_cmax = GetCurrentCommandId();
oldtup.t_data->t_infomask &= ~(HEAP_XMAX_COMMITTED |
else
{
oldtup.t_data->t_infomask &= ~HEAP_XMAX_UNLOGGED;
-#ifdef XLOG
XactPopRollback();
-#endif
}
/* record address of new tuple in t_ctid of old one */
oldtup.t_data->t_ctid = newtup->t_self;
-#ifdef XLOG
/* XLOG stuff */
{
XLogRecPtr recptr = log_heap_update(relation,
PageSetLSN(BufferGetPage(buffer), recptr);
PageSetSUI(BufferGetPage(buffer), ThisStartUpID);
}
-#endif
if (newbuf != buffer)
{
return result;
}
-#ifdef XLOG
/*
* XLOG stuff: no logging is required as long as we have no
* savepoints. For savepoints private log could be used...
*/
((PageHeader) BufferGetPage(*buffer))->pd_sui = ThisStartUpID;
-#endif
/* store transaction information of xact marking the tuple */
TransactionIdStore(GetCurrentTransactionId(), &(tuple->t_data->t_xmax));
}
}
-#ifdef XLOG
-
static XLogRecPtr
log_heap_update(Relation reln, ItemPointerData from,
HeapTuple newtup, bool move)
else
strcat(buf, "UNKNOWN");
}
-
-#endif /* XLOG */
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtinsert.c,v 1.68 2000/11/16 05:50:58 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtinsert.c,v 1.69 2000/11/30 08:46:21 vadim Exp $
*
*-------------------------------------------------------------------------
*/
static bool _bt_isequal(TupleDesc itupdesc, Page page, OffsetNumber offnum,
int keysz, ScanKey scankey);
-#ifdef XLOG
static Relation _xlheapRel; /* temporary hack */
-#endif
/*
* _bt_doinsert() -- Handle insertion of a single btitem in the tree.
}
}
-#ifdef XLOG
_xlheapRel = heapRel; /* temporary hack */
-#endif
/* do the insertion */
res = _bt_insertonpg(rel, buf, stack, natts, itup_scankey, btitem, 0);
}
else
{
-#ifdef XLOG
/* XLOG stuff */
{
char xlbuf[sizeof(xl_btree_insert) +
PageSetLSN(page, recptr);
PageSetSUI(page, ThisStartUpID);
}
-#endif
+
_bt_pgaddtup(rel, page, itemsz, btitem, newitemoff, "page");
itup_off = newitemoff;
itup_blkno = BufferGetBlockNumber(buf);
rightoff;
OffsetNumber maxoff;
OffsetNumber i;
-
-#ifdef XLOG
BTItem lhikey;
-#endif
rbuf = _bt_getbuf(rel, P_NEW, BT_WRITE);
origpage = BufferGetPage(buf);
itemsz = ItemIdGetLength(itemid);
item = (BTItem) PageGetItem(origpage, itemid);
}
-#ifdef XLOG
lhikey = item;
-#endif
if (PageAddItem(leftpage, (Item) item, itemsz, leftoff,
LP_USED) == InvalidOffsetNumber)
elog(STOP, "btree: failed to add hikey to the left sibling");
spage = BufferGetPage(sbuf);
}
-#ifdef XLOG
/*
* Right sibling is locked, new siblings are prepared, but original
* page is not updated yet. Log changes before continuing.
PageSetSUI(spage, ThisStartUpID);
}
}
-#endif
/*
* By here, the original data page has been split into two new halves,
BTItem item;
Size itemsz;
BTItem new_item;
-
-#ifdef XLOG
Buffer metabuf;
-#endif
/* get a new root page */
rootbuf = _bt_getbuf(rel, P_NEW, BT_WRITE);
rootpage = BufferGetPage(rootbuf);
rootblknum = BufferGetBlockNumber(rootbuf);
-
-#ifdef XLOG
metabuf = _bt_getbuf(rel, BTREE_METAPAGE,BT_WRITE);
-#endif
/* NO ELOG(ERROR) from here till newroot op is logged */
elog(STOP, "btree: failed to add rightkey to new root page");
pfree(new_item);
-#ifdef XLOG
/* XLOG stuff */
{
xl_btree_newroot xlrec;
_bt_wrtbuf(rel, metabuf);
}
-#endif
/* write and let go of the new root buffer */
_bt_wrtbuf(rel, rootbuf);
-#ifndef XLOG
- /* update metadata page with new root block number */
- _bt_metaproot(rel, rootblknum, 0);
-#endif
-
/* update and release new sibling, and finally the old root */
_bt_wrtbuf(rel, rbuf);
_bt_wrtbuf(rel, lbuf);
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtpage.c,v 1.41 2000/11/30 01:39:06 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtpage.c,v 1.42 2000/11/30 08:46:21 vadim Exp $
*
* NOTES
* Postgres btree pages look like ordinary relation pages. The opaque
rootopaque = (BTPageOpaque) PageGetSpecialPointer(rootpage);
rootopaque->btpo_flags |= (BTP_LEAF | BTP_ROOT);
-#ifdef XLOG
/* XLOG stuff */
{
xl_btree_newroot xlrec;
PageSetLSN(metapg, recptr);
PageSetSUI(metapg, ThisStartUpID);
}
-#endif
metad->btm_root = rootblkno;
metad->btm_level = 1;
buf = _bt_getbuf(rel, blkno, BT_WRITE);
page = BufferGetPage(buf);
-#ifdef XLOG
/* XLOG stuff */
{
xl_btree_delete xlrec;
PageSetLSN(page, recptr);
PageSetSUI(page, ThisStartUpID);
}
-#endif
PageIndexTupleDelete(page, offno);
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtree.c,v 1.71 2000/11/21 21:15:55 petere Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtree.c,v 1.72 2000/11/30 08:46:21 vadim Exp $
*
*-------------------------------------------------------------------------
*/
bool FastBuild = true; /* use sort/build instead of insertion
* build */
-#ifdef XLOG
#include "access/xlogutils.h"
-#endif
-
static void _bt_restscan(IndexScanDesc scan);
/*
}
}
-#ifdef XLOG
-
static bool
_bt_cleanup_page(Page page, RelFileNode hnode)
{
else
strcat(buf, "UNKNOWN");
}
-
-#endif
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/rtree/Attic/rtree.c,v 1.56 2000/11/21 21:15:55 petere Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/rtree/Attic/rtree.c,v 1.57 2000/11/30 08:46:21 vadim Exp $
*
*-------------------------------------------------------------------------
*/
#include "executor/executor.h"
#include "miscadmin.h"
-#ifdef XLOG
#include "access/xlogutils.h"
-#endif
typedef struct SPLITVEC
{
#endif /* defined RTDEBUG */
-#ifdef XLOG
void
rtree_redo(XLogRecPtr lsn, XLogRecord *record)
{
rtree_desc(char *buf, uint8 xl_info, char* rec)
{
}
-#endif
{"Gist", gist_redo, gist_undo, gist_desc},
{"Sequence", seq_redo, seq_undo, seq_desc}
};
-
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/transam/transam.c,v 1.37 2000/11/21 21:15:57 petere Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/transam/transam.c,v 1.38 2000/11/30 08:46:22 vadim Exp $
*
* NOTES
* This file contains the high level access-method interface to the
SpinAcquire(OidGenLockId);
if (!TransactionIdDidCommit(AmiTransactionId))
{
-
- /* ----------------
- * SOMEDAY initialize the information stored in
- * the headers of the log/variable relations.
- * ----------------
- */
TransactionLogUpdate(AmiTransactionId, XID_COMMIT);
TransactionIdStore(AmiTransactionId, &cachedTestXid);
cachedTestXidStatus = XID_COMMIT;
-#ifdef XLOG
Assert(!IsUnderPostmaster &&
ShmemVariableCache->nextXid <= FirstTransactionId);
ShmemVariableCache->nextXid = FirstTransactionId;
-#else
- VariableRelationPutNextXid(FirstTransactionId);
-#endif
-
}
else if (RecoveryCheckingEnabled())
{
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/transam/Attic/transsup.c,v 1.26 2000/10/28 16:20:53 vadim Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/transam/Attic/transsup.c,v 1.27 2000/11/30 08:46:22 vadim Exp $
*
* NOTES
* This file contains support functions for the high
bits8 bit2;
BitIndex offset;
-#ifdef XLOG
tblock = (Block) ((char*) tblock + sizeof(XLogRecPtr));
-#endif
/* ----------------
* calculate the index into the transaction data where
Index index;
BitIndex offset;
-#ifdef XLOG
tblock = (Block) ((char*) tblock + sizeof(XLogRecPtr));
-#endif
/* ----------------
* calculate the index into the transaction data where
/*-------------------------------------------------------------------------
*
* varsup.c
- * postgres variable relation support routines
- *
- * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
- * Portions Copyright (c) 1994, Regents of the University of California
+ * postgres OID & XID variables support routines
*
+ * Copyright (c) 2000, PostgreSQL, Inc
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/transam/varsup.c,v 1.33 2000/11/20 16:47:30 petere Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/transam/varsup.c,v 1.34 2000/11/30 08:46:22 vadim Exp $
*
*-------------------------------------------------------------------------
*/
-#include "postgres.h"
-#ifdef XLOG
-#include "xlog_varsup.c"
-#else
+#include "postgres.h"
-#include "access/heapam.h"
-#include "catalog/catname.h"
+#include "access/transam.h"
#include "storage/proc.h"
-static void GetNewObjectIdBlock(Oid *oid_return, int oid_block_size);
-static void VariableRelationGetNextOid(Oid *oid_return);
-static void VariableRelationGetNextXid(TransactionId *xidP);
-static void VariableRelationPutNextOid(Oid oid);
+SPINLOCK OidGenLockId;
-/* ---------------------
- * spin lock for oid generation
- * ---------------------
- */
-int OidGenLockId;
+extern SPINLOCK XidGenLockId;
+extern void XLogPutNextOid(Oid nextOid);
-/* ---------------------
- * pointer to "variable cache" in shared memory (set up by shmem.c)
- * ---------------------
- */
+/* pointer to "variable cache" in shared memory (set up by shmem.c) */
VariableCache ShmemVariableCache = NULL;
-
-/* ----------------------------------------------------------------
- * variable relation query/update routines
- * ----------------------------------------------------------------
- */
-
-/* --------------------------------
- * VariableRelationGetNextXid
- * --------------------------------
- */
-static void
-VariableRelationGetNextXid(TransactionId *xidP)
-{
- Buffer buf;
- VariableRelationContents var;
-
- /* ----------------
- * We assume that a spinlock has been acquired to guarantee
- * exclusive access to the variable relation.
- * ----------------
- */
-
- /* ----------------
- * do nothing before things are initialized
- * ----------------
- */
- if (!RelationIsValid(VariableRelation))
- return;
-
- /* ----------------
- * read the variable page, get the the nextXid field and
- * release the buffer
- * ----------------
- */
- buf = ReadBuffer(VariableRelation, 0);
-
- if (!BufferIsValid(buf))
- {
- SpinRelease(OidGenLockId);
- elog(ERROR, "VariableRelationGetNextXid: ReadBuffer failed");
- }
-
- var = (VariableRelationContents) BufferGetBlock(buf);
-
- TransactionIdStore(var->nextXidData, xidP);
-
- ReleaseBuffer(buf);
-}
-
-/* --------------------------------
- * VariableRelationPutNextXid
- * --------------------------------
- */
-void
-VariableRelationPutNextXid(TransactionId xid)
-{
- Buffer buf;
- VariableRelationContents var;
-
- /* ----------------
- * We assume that a spinlock has been acquired to guarantee
- * exclusive access to the variable relation.
- * ----------------
- */
-
- /* ----------------
- * do nothing before things are initialized
- * ----------------
- */
- if (!RelationIsValid(VariableRelation))
- return;
-
- /* ----------------
- * read the variable page, update the nextXid field and
- * write the page back out to disk (with immediate write).
- * ----------------
- */
- buf = ReadBuffer(VariableRelation, 0);
-
- if (!BufferIsValid(buf))
- {
- SpinRelease(OidGenLockId);
- elog(ERROR, "VariableRelationPutNextXid: ReadBuffer failed");
- }
-
- var = (VariableRelationContents) BufferGetBlock(buf);
-
- TransactionIdStore(xid, &(var->nextXidData));
-
- FlushBuffer(buf, true, true);
-}
-
-/* --------------------------------
- * VariableRelationGetNextOid
- * --------------------------------
- */
-static void
-VariableRelationGetNextOid(Oid *oid_return)
-{
- Buffer buf;
- VariableRelationContents var;
-
- /* ----------------
- * We assume that a spinlock has been acquired to guarantee
- * exclusive access to the variable relation.
- * ----------------
- */
-
- /* ----------------
- * if the variable relation is not initialized, then we
- * assume we are running at bootstrap time and so we return
- * an invalid object id (this path should never be taken, probably).
- * ----------------
- */
- if (!RelationIsValid(VariableRelation))
- {
- (*oid_return) = InvalidOid;
- return;
- }
-
- /* ----------------
- * read the variable page, get the the nextOid field and
- * release the buffer
- * ----------------
- */
- buf = ReadBuffer(VariableRelation, 0);
-
- if (!BufferIsValid(buf))
- {
- SpinRelease(OidGenLockId);
- elog(ERROR, "VariableRelationGetNextOid: ReadBuffer failed");
- }
-
- var = (VariableRelationContents) BufferGetBlock(buf);
-
- (*oid_return) = var->nextOid;
-
- ReleaseBuffer(buf);
-}
-
-/* --------------------------------
- * VariableRelationPutNextOid
- * --------------------------------
- */
-static void
-VariableRelationPutNextOid(Oid oid)
-{
- Buffer buf;
- VariableRelationContents var;
-
- /* ----------------
- * We assume that a spinlock has been acquired to guarantee
- * exclusive access to the variable relation.
- * ----------------
- */
-
- /* ----------------
- * do nothing before things are initialized
- * ----------------
- */
- if (!RelationIsValid(VariableRelation))
- return;
-
- /* ----------------
- * read the variable page, update the nextXid field and
- * write the page back out to disk.
- * ----------------
- */
- buf = ReadBuffer(VariableRelation, 0);
-
- if (!BufferIsValid(buf))
- {
- SpinRelease(OidGenLockId);
- elog(ERROR, "VariableRelationPutNextOid: ReadBuffer failed");
- }
-
- var = (VariableRelationContents) BufferGetBlock(buf);
-
- var->nextOid = oid;
-
- WriteBuffer(buf);
-}
-
-/* ----------------------------------------------------------------
- * transaction id generation support
- * ----------------------------------------------------------------
- */
-
-/* ----------------
- * GetNewTransactionId
- *
- * Transaction IDs are allocated via a cache in shared memory.
- * Each time we need more IDs, we advance the "next XID" value
- * in pg_variable by VAR_XID_PREFETCH and set the cache to
- * show that many XIDs as available. Then, allocating those XIDs
- * requires just a spinlock and not a buffer read/write cycle.
- *
- * Since the cache is shared across all backends, cached but unused
- * XIDs are not lost when a backend exits, only when the postmaster
- * quits or forces shared memory reinit. So we can afford to have
- * a pretty big value of VAR_XID_PREFETCH.
- *
- * This code does not worry about initializing the transaction counter
- * (see transam.c's InitializeTransactionLog() for that). We also
- * ignore the possibility that the counter could someday wrap around.
- * ----------------
- */
-
-#define VAR_XID_PREFETCH 1024
-
void
GetNewTransactionId(TransactionId *xid)
{
-
- /* ----------------
- * during bootstrap initialization, we return the special
- * bootstrap transaction id.
- * ----------------
+ /*
+ * During bootstrap initialization, we return the special
+ * bootstrap transaction id.
*/
if (AMI_OVERRIDE)
{
- TransactionIdStore(AmiTransactionId, xid);
+ *xid = AmiTransactionId;
return;
}
- SpinAcquire(OidGenLockId); /* not good for concurrency... */
-
- if (ShmemVariableCache->xid_count == 0)
- {
- TransactionId nextid;
-
- VariableRelationGetNextXid(&nextid);
- TransactionIdStore(nextid, &(ShmemVariableCache->nextXid));
- ShmemVariableCache->xid_count = VAR_XID_PREFETCH;
- TransactionIdAdd(&nextid, VAR_XID_PREFETCH);
- VariableRelationPutNextXid(nextid);
- }
-
- TransactionIdStore(ShmemVariableCache->nextXid, xid);
- TransactionIdAdd(&(ShmemVariableCache->nextXid), 1);
- (ShmemVariableCache->xid_count)--;
+ SpinAcquire(XidGenLockId);
+ *xid = ShmemVariableCache->nextXid;
+ (ShmemVariableCache->nextXid)++;
if (MyProc != (PROC *) NULL)
MyProc->xid = *xid;
- SpinRelease(OidGenLockId);
+ SpinRelease(XidGenLockId);
+
}
/*
ReadNewTransactionId(TransactionId *xid)
{
- /* ----------------
- * during bootstrap initialization, we return the special
- * bootstrap transaction id.
- * ----------------
+ /*
+ * During bootstrap initialization, we return the special
+ * bootstrap transaction id.
*/
if (AMI_OVERRIDE)
{
- TransactionIdStore(AmiTransactionId, xid);
+ *xid = AmiTransactionId;
return;
}
- SpinAcquire(OidGenLockId); /* not good for concurrency... */
+ SpinAcquire(XidGenLockId);
+ *xid = ShmemVariableCache->nextXid;
+ SpinRelease(XidGenLockId);
- /*
- * Note that we don't check is ShmemVariableCache->xid_count equal to
- * 0 or not. This will work as long as we don't call
- * ReadNewTransactionId() before GetNewTransactionId().
- */
- if (ShmemVariableCache->nextXid == 0)
- elog(ERROR, "ReadNewTransactionId: ShmemVariableCache->nextXid is not initialized");
-
- TransactionIdStore(ShmemVariableCache->nextXid, xid);
-
- SpinRelease(OidGenLockId);
}
/* ----------------------------------------------------------------
* ----------------------------------------------------------------
*/
-/* ----------------
- * GetNewObjectIdBlock
- *
- * This support function is used to allocate a block of object ids
- * of the given size.
- * ----------------
- */
-static void
-GetNewObjectIdBlock(Oid *oid_return, /* place to return the first new
- * object id */
- int oid_block_size) /* number of oids desired */
-{
- Oid firstfreeoid;
- Oid nextoid;
-
- /* ----------------
- * Obtain exclusive access to the variable relation page
- * ----------------
- */
- SpinAcquire(OidGenLockId);
-
- /* ----------------
- * get the "next" oid from the variable relation
- * ----------------
- */
- VariableRelationGetNextOid(&firstfreeoid);
-
- /* ----------------
- * Allocate the range of OIDs to be returned to the caller.
- *
- * There are two things going on here.
- *
- * One: in a virgin database pg_variable will initially contain zeroes,
- * so we will read out firstfreeoid = InvalidOid. We want to start
- * allocating OIDs at BootstrapObjectIdData instead (OIDs below that
- * are reserved for static assignment in the initial catalog data).
- *
- * Two: if a database is run long enough, the OID counter will wrap
- * around. We must not generate an invalid OID when that happens,
- * and it seems wise not to generate anything in the reserved range.
- * Therefore we advance to BootstrapObjectIdData in this case too.
- *
- * The comparison here assumes that Oid is an unsigned type.
- */
- nextoid = firstfreeoid + oid_block_size;
-
- if (! OidIsValid(firstfreeoid) || nextoid < firstfreeoid)
- {
- /* Initialization or wraparound time, force it up to safe range */
- firstfreeoid = BootstrapObjectIdData;
- nextoid = firstfreeoid + oid_block_size;
- }
-
- (*oid_return) = firstfreeoid;
-
- /* ----------------
- * Update the variable relation to show the block range as used.
- * ----------------
- */
- VariableRelationPutNextOid(nextoid);
-
- /* ----------------
- * Relinquish our lock on the variable relation page
- * ----------------
- */
- SpinRelease(OidGenLockId);
-}
-
-/* ----------------
- * GetNewObjectId
- *
- * This function allocates and parses out object ids. Like
- * GetNewTransactionId(), it "prefetches" 32 object ids by
- * incrementing the nextOid stored in the var relation by 32 and then
- * returning these id's one at a time until they are exhausted.
- * This means we reduce the number of accesses to the variable
- * relation by 32 for each backend.
- *
- * Note: 32 has no special significance. We don't want the
- * number to be too large because when the backend
- * terminates, we lose the oids we cached.
- *
- * Question: couldn't we use a shared-memory cache just like XIDs?
- * That would allow a larger interval between pg_variable updates
- * without cache losses. Note, however, that we can assign an OID
- * without even a spinlock from the backend-local OID cache.
- * Maybe two levels of caching would be good.
- * ----------------
- */
-
-#define VAR_OID_PREFETCH 32
-
-static int prefetched_oid_count = 0;
-static Oid next_prefetched_oid;
+#define VAR_OID_PREFETCH 8192
+static Oid lastSeenOid = InvalidOid;
void
-GetNewObjectId(Oid *oid_return) /* place to return the new object id */
+GetNewObjectId(Oid *oid_return)
{
- /* ----------------
- * if we run out of prefetched oids, then we get some
- * more before handing them out to the caller.
- * ----------------
- */
+ SpinAcquire(OidGenLockId);
- if (prefetched_oid_count == 0)
+ /* If we run out of logged for use oids then we log more */
+ if (ShmemVariableCache->oidCount == 0)
{
- int oid_block_size = VAR_OID_PREFETCH;
-
- /* ----------------
- * Make sure pg_variable is open.
- * ----------------
- */
- if (!RelationIsValid(VariableRelation))
- VariableRelation = heap_openr(VariableRelationName, NoLock);
-
- /* ----------------
- * get a new block of prefetched object ids.
- * ----------------
- */
- GetNewObjectIdBlock(&next_prefetched_oid, oid_block_size);
-
- /* ----------------
- * now reset the prefetched_oid_count.
- * ----------------
- */
- prefetched_oid_count = oid_block_size;
+ XLogPutNextOid(ShmemVariableCache->nextOid + VAR_OID_PREFETCH);
+ ShmemVariableCache->oidCount = VAR_OID_PREFETCH;
}
- /* ----------------
- * return the next prefetched oid in the pointer passed by
- * the user and decrement the prefetch count.
- * ----------------
- */
if (PointerIsValid(oid_return))
- (*oid_return) = next_prefetched_oid;
+ lastSeenOid = (*oid_return) = ShmemVariableCache->nextOid;
- next_prefetched_oid++;
- prefetched_oid_count--;
+ (ShmemVariableCache->nextOid)++;
+ (ShmemVariableCache->oidCount)--;
+
+ SpinRelease(OidGenLockId);
}
void
CheckMaxObjectId(Oid assigned_oid)
{
- Oid temp_oid;
- if (prefetched_oid_count == 0) /* make sure next/max is set, or
- * reload */
- GetNewObjectId(&temp_oid);
-
- /* ----------------
- * If we are below prefetched limits, do nothing
- * ----------------
- */
-
- if (assigned_oid < next_prefetched_oid)
+ if (lastSeenOid != InvalidOid && assigned_oid < lastSeenOid)
return;
- /* ----------------
- * If we are here, we are coming from a 'copy from' with oid's
- *
- * If we are in the prefetched oid range, just bump it up
- * ----------------
- */
+ SpinAcquire(OidGenLockId);
+ if (assigned_oid < ShmemVariableCache->nextOid)
+ {
+ lastSeenOid = ShmemVariableCache->nextOid - 1;
+ SpinRelease(OidGenLockId);
+ return;
+ }
- if (assigned_oid <= next_prefetched_oid + prefetched_oid_count - 1)
+ /* If we are in the logged oid range, just bump nextOid up */
+ if (assigned_oid <= ShmemVariableCache->nextOid +
+ ShmemVariableCache->oidCount - 1)
{
- prefetched_oid_count -= assigned_oid - next_prefetched_oid + 1;
- next_prefetched_oid = assigned_oid + 1;
+ ShmemVariableCache->oidCount -=
+ assigned_oid - ShmemVariableCache->nextOid + 1;
+ ShmemVariableCache->nextOid = assigned_oid + 1;
+ SpinRelease(OidGenLockId);
return;
}
- /* ----------------
- * We have exceeded the prefetch oid range
- *
- * We should lock the database and kill all other backends
- * but we are loading oid's that we can not guarantee are unique
- * anyway, so we must rely on the user
- *
- * We now:
- * set the variable relation with the new max oid
- * force the backend to reload its oid cache
- *
- * By reloading the oid cache, we don't have to update the variable
- * relation every time when sequential OIDs are being loaded by COPY.
- * ----------------
+ /*
+ * We have exceeded the logged oid range.
+ * We should lock the database and kill all other backends
+ * but we are loading oid's that we can not guarantee are unique
+ * anyway, so we must rely on the user.
*/
- SpinAcquire(OidGenLockId);
- VariableRelationPutNextOid(assigned_oid);
+ XLogPutNextOid(assigned_oid + VAR_OID_PREFETCH);
+ ShmemVariableCache->oidCount = VAR_OID_PREFETCH - 1;
+ ShmemVariableCache->nextOid = assigned_oid + 1;
+
SpinRelease(OidGenLockId);
- prefetched_oid_count = 0; /* force reload */
- GetNewObjectId(&temp_oid); /* cause target OID to be allocated */
}
-
-#endif /* !XLOG */
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.85 2000/11/30 01:47:31 vadim Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.86 2000/11/30 08:46:22 vadim Exp $
*
* NOTES
* Transaction aborts can now occur two ways:
int DefaultXactIsoLevel = XACT_READ_COMMITTED;
int XactIsoLevel;
-#ifdef XLOG
#include "access/xlogutils.h"
int CommitDelay = 5; /* 1/200000 sec */
static void (*_RollbackFunc)(void*) = NULL;
static void *_RollbackData = NULL;
-#endif
-
/* ----------------
* info returned when the system is disabled
*
TransactionId xid;
int leak;
- /* ----------------
- * get the current transaction id
- * ----------------
- */
xid = GetCurrentTransactionId();
- /*
- * flush the buffer manager pages. Note: if we have stable main
- * memory, dirty shared buffers are not flushed plai 8/7/90
- */
leak = BufferPoolCheckLeak();
-#ifdef XLOG
if (MyLastRecPtr.xrecoff != 0)
{
xl_xact_commit xlrec;
xlrec.xtime = time(NULL);
/*
- * MUST SAVE ARRAY OF RELFILENODE-s TO DROP
+ * SHOULD SAVE ARRAY OF RELFILENODE-s TO DROP
*/
recptr = XLogInsert(RM_XACT_ID, XLOG_XACT_COMMIT,
(char*) &xlrec, SizeOfXactCommit, NULL, 0);
MyProc->logRec.xrecoff = 0;
}
-#else
- /*
- * If no one shared buffer was changed by this transaction then we
- * don't flush shared buffers and don't record commit status.
- */
- if (SharedBufferChanged)
- {
- FlushBufferPool();
- if (leak)
- ResetBufferPool(true);
-
- /*
- * have the transaction access methods record the status of this
- * transaction id in the pg_log relation.
- */
- TransactionIdCommit(xid);
-
- /*
- * Now write the log info to the disk too.
- */
- leak = BufferPoolCheckLeak();
- FlushBufferPool();
- }
-#endif
if (leak)
ResetBufferPool(true);
static void
RecordTransactionAbort(void)
{
- TransactionId xid;
+ TransactionId xid = GetCurrentTransactionId();
- /* ----------------
- * get the current transaction id
- * ----------------
- */
- xid = GetCurrentTransactionId();
-
- /*
- * Have the transaction access methods record the status of this
- * transaction id in the pg_log relation. We skip it if no one shared
- * buffer was changed by this transaction.
- */
- if (SharedBufferChanged && !TransactionIdDidCommit(xid))
- TransactionIdAbort(xid);
-
-#ifdef XLOG
if (MyLastRecPtr.xrecoff != 0)
{
xl_xact_abort xlrec;
recptr = XLogInsert(RM_XACT_ID, XLOG_XACT_ABORT,
(char*) &xlrec, SizeOfXactAbort, NULL, 0);
+ TransactionIdAbort(xid);
MyProc->logRec.xrecoff = 0;
}
-#endif
/*
* Tell bufmgr and smgr to release resources.
return false;
}
-#ifdef XLOG
-
void
xact_redo(XLogRecPtr lsn, XLogRecord *record)
{
xl_xact_commit *xlrec = (xl_xact_commit*) XLogRecGetData(record);
TransactionIdCommit(record->xl_xid);
- /* MUST REMOVE FILES OF ALL DROPPED RELATIONS */
+ /* SHOULD REMOVE FILES OF ALL DROPPED RELATIONS */
}
else if (info == XLOG_XACT_ABORT)
{
{
_RollbackFunc = NULL;
}
-
-#endif
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Header: /cvsroot/pgsql/src/backend/access/transam/xlog.c,v 1.37 2000/11/30 01:47:31 vadim Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/transam/xlog.c,v 1.38 2000/11/30 08:46:22 vadim Exp $
*
*-------------------------------------------------------------------------
*/
BootStrapXLOG()
{
CheckPoint checkPoint;
-#ifdef XLOG
char buffer[BLCKSZ];
bool usexistent = false;
XLogPageHeader page = (XLogPageHeader) buffer;
XLogRecord *record;
-#endif
checkPoint.redo.xlogid = 0;
checkPoint.redo.xrecoff = SizeOfXLogPHD;
ShmemVariableCache->nextOid = checkPoint.nextOid;
ShmemVariableCache->oidCount = 0;
-#ifdef XLOG
-
memset(buffer, 0, BLCKSZ);
page->xlp_magic = XLOG_PAGE_MAGIC;
page->xlp_info = 0;
close(logFile);
logFile = -1;
-#endif
-
memset(ControlFile, 0, sizeof(ControlFileData));
ControlFile->logId = 0;
ControlFile->logSeg = 1;
return buf;
}
-
/*
* This func must be called ONCE on system startup
*/
void
StartupXLOG()
{
-#ifdef XLOG
XLogCtlInsert *Insert;
CheckPoint checkPoint;
XLogRecPtr RecPtr,
char buffer[MAXLOGRECSZ + SizeOfXLogRecord];
bool sie_saved = false;
-#endif
-
elog(LOG, "starting up");
XLogCtl->xlblocks = (XLogRecPtr *) (((char *) XLogCtl) + sizeof(XLogCtlData));
elog(LOG, "database system was interrupted at %s",
str_time(ControlFile->time));
-#ifdef XLOG
-
LastRec = RecPtr = ControlFile->checkPoint;
if (!XRecOffIsValid(RecPtr.xrecoff))
elog(STOP, "Invalid checkPoint in control file");
checkPoint.nextXid, checkPoint.nextOid);
if (checkPoint.nextXid < FirstTransactionId ||
checkPoint.nextOid < BootstrapObjectIdData)
-
-#ifdef XLOG_2
elog(STOP, "Invalid NextTransactionId/NextOid");
-#else
- elog(LOG, "Invalid NextTransactionId/NextOid");
-#endif
ShmemVariableCache->nextXid = checkPoint.nextXid;
ShmemVariableCache->nextOid = checkPoint.nextOid;
}
InRecovery = false;
-#endif /* XLOG */
-
ControlFile->state = DB_IN_PRODUCTION;
ControlFile->time = time(NULL);
UpdateControlFile();
{
elog(LOG, "shutting down");
-#ifdef XLOG
CreateDummyCaches();
-#endif
CreateCheckPoint(true);
elog(LOG, "database system is shut down");
void
CreateCheckPoint(bool shutdown)
{
-#ifdef XLOG
CheckPoint checkPoint;
XLogRecPtr recptr;
XLogCtlInsert *Insert = &XLogCtl->Insert;
XLogFlush(recptr);
-#endif /* XLOG */
-
SpinAcquire(ControlFileLockId);
if (shutdown)
ControlFile->state = DB_SHUTDOWNED;
-#ifdef XLOG
else /* create new log file */
{
if (recptr.xrecoff % XLogSegSize >=
_logSeg = ControlFile->logSeg - 1;
strcpy(archdir, ControlFile->archdir);
-#else
- ControlFile->checkPoint.xlogid = 0;
- ControlFile->checkPoint.xrecoff = SizeOfXLogPHD;
-#endif
-
ControlFile->time = time(NULL);
UpdateControlFile();
SpinRelease(ControlFileLockId);
-#ifdef XLOG
/*
* Delete offline log files. Get oldest online
* log file from undo rec if it's valid.
S_UNLOCK(&(XLogCtl->chkp_lck));
MyLastRecPtr.xrecoff = 0; /* to avoid commit record */
-#endif
return;
}
+++ /dev/null
-/*-------------------------------------------------------------------------
- *
- * varsup.c
- * postgres OID & XID variables support routines
- *
- * Copyright (c) 2000, PostgreSQL, Inc
- *
- * IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/transam/Attic/xlog_varsup.c,v 1.1 2000/11/03 11:39:35 vadim Exp $
- *
- *-------------------------------------------------------------------------
- */
-
-#include "postgres.h"
-
-#include "access/transam.h"
-#include "storage/proc.h"
-
-SPINLOCK OidGenLockId;
-
-extern SPINLOCK XidGenLockId;
-extern void XLogPutNextOid(Oid nextOid);
-
-/* pointer to "variable cache" in shared memory (set up by shmem.c) */
-VariableCache ShmemVariableCache = NULL;
-
-void
-GetNewTransactionId(TransactionId *xid)
-{
- /*
- * During bootstrap initialization, we return the special
- * bootstrap transaction id.
- */
- if (AMI_OVERRIDE)
- {
- *xid = AmiTransactionId;
- return;
- }
-
- SpinAcquire(XidGenLockId);
- *xid = ShmemVariableCache->nextXid;
- (ShmemVariableCache->nextXid)++;
-
- if (MyProc != (PROC *) NULL)
- MyProc->xid = *xid;
-
- SpinRelease(XidGenLockId);
-
-}
-
-/*
- * Like GetNewTransactionId reads nextXid but don't fetch it.
- */
-void
-ReadNewTransactionId(TransactionId *xid)
-{
-
- /*
- * During bootstrap initialization, we return the special
- * bootstrap transaction id.
- */
- if (AMI_OVERRIDE)
- {
- *xid = AmiTransactionId;
- return;
- }
-
- SpinAcquire(XidGenLockId);
- *xid = ShmemVariableCache->nextXid;
- SpinRelease(XidGenLockId);
-
-}
-
-/* ----------------------------------------------------------------
- * object id generation support
- * ----------------------------------------------------------------
- */
-
-#define VAR_OID_PREFETCH 8192
-static Oid lastSeenOid = InvalidOid;
-
-void
-GetNewObjectId(Oid *oid_return)
-{
- SpinAcquire(OidGenLockId);
-
- /* If we run out of logged for use oids then we log more */
- if (ShmemVariableCache->oidCount == 0)
- {
- XLogPutNextOid(ShmemVariableCache->nextOid + VAR_OID_PREFETCH);
- ShmemVariableCache->oidCount = VAR_OID_PREFETCH;
- }
-
- if (PointerIsValid(oid_return))
- lastSeenOid = (*oid_return) = ShmemVariableCache->nextOid;
-
- (ShmemVariableCache->nextOid)++;
- (ShmemVariableCache->oidCount)--;
-
- SpinRelease(OidGenLockId);
-}
-
-void
-CheckMaxObjectId(Oid assigned_oid)
-{
-
- if (lastSeenOid != InvalidOid && assigned_oid < lastSeenOid)
- return;
-
- SpinAcquire(OidGenLockId);
- if (assigned_oid < ShmemVariableCache->nextOid)
- {
- lastSeenOid = ShmemVariableCache->nextOid - 1;
- SpinRelease(OidGenLockId);
- return;
- }
-
- /* If we are in the logged oid range, just bump nextOid up */
- if (assigned_oid <= ShmemVariableCache->nextOid +
- ShmemVariableCache->oidCount - 1)
- {
- ShmemVariableCache->oidCount -=
- assigned_oid - ShmemVariableCache->nextOid + 1;
- ShmemVariableCache->nextOid = assigned_oid + 1;
- SpinRelease(OidGenLockId);
- return;
- }
-
- /*
- * We have exceeded the logged oid range.
- * We should lock the database and kill all other backends
- * but we are loading oid's that we can not guarantee are unique
- * anyway, so we must rely on the user.
- */
-
- XLogPutNextOid(assigned_oid + VAR_OID_PREFETCH);
- ShmemVariableCache->oidCount = VAR_OID_PREFETCH - 1;
- ShmemVariableCache->nextOid = assigned_oid + 1;
-
- SpinRelease(OidGenLockId);
-
-}
*/
#include "postgres.h"
-
-#ifdef XLOG
-
#include "access/xlog.h"
#include "access/transam.h"
#include "access/xact.h"
return(&(res->reldata));
}
-
-#endif
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/commands/dbcommands.c,v 1.69 2000/11/18 03:36:48 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/commands/dbcommands.c,v 1.70 2000/11/30 08:46:22 vadim Exp $
*
*-------------------------------------------------------------------------
*/
elog(ERROR, "database path may not contain single quotes");
/* ... otherwise we'd be open to shell exploits below */
-#ifdef XLOG
/* Force dirty buffers out to disk, to ensure source database is
* up-to-date for the copy. (We really only need to flush buffers
* for the source database...)
*/
BufferSync();
-#endif
/*
* Close virtual file descriptors so the kernel has more available for
/* Close pg_database, but keep lock till commit */
heap_close(pg_database_rel, NoLock);
-#ifdef XLOG
/* Force dirty buffers out to disk, so that newly-connecting backends
* will see the new database in pg_database right away. (They'll see
* an uncommitted tuple, but they don't care; see GetRawDatabaseInfo.)
*/
BufferSync();
-#endif
}
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.173 2000/11/16 22:30:19 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.174 2000/11/30 08:46:22 vadim Exp $
*
*-------------------------------------------------------------------------
#include
#endif
-#ifdef XLOG
#include "access/xlog.h"
-XLogRecPtr log_heap_move(Relation reln,
- ItemPointerData from, HeapTuple newtup);
-#endif
+extern XLogRecPtr log_heap_move(Relation reln,
+ ItemPointerData from, HeapTuple newtup);
static MemoryContext vac_context = NULL;
newtup.t_data = (HeapTupleHeader) PageGetItem(ToPage, newitemid);
ItemPointerSet(&(newtup.t_self), destvacpage->blkno, newoff);
-#ifdef XLOG
{
XLogRecPtr recptr =
log_heap_move(onerel, tuple.t_self, &newtup);
PageSetLSN(ToPage, recptr);
PageSetSUI(ToPage, ThisStartUpID);
}
-#endif
if (((int) destvacpage->blkno) > last_move_dest_block)
last_move_dest_block = destvacpage->blkno;
~(HEAP_XMIN_COMMITTED | HEAP_XMIN_INVALID | HEAP_MOVED_IN);
tuple.t_data->t_infomask |= HEAP_MOVED_OFF;
-#ifdef XLOG
{
XLogRecPtr recptr =
log_heap_move(onerel, tuple.t_self, &newtup);
PageSetLSN(ToPage, recptr);
PageSetSUI(ToPage, ThisStartUpID);
}
-#endif
cur_page->offsets_used++;
num_moved++;
if (num_moved > 0)
{
-#ifdef XLOG
- RecordTransactionCommit();
-#else
/*
* We have to commit our tuple' movings before we'll truncate
* relation, but we shouldn't lose our locks. And so - quick hack:
- * flush buffers and record status of current transaction as
- * committed, and continue. - vadim 11/13/96
+ * record status of current transaction as committed, and continue.
*/
- FlushBufferPool();
- TransactionIdCommit(myXID);
- FlushBufferPool();
-#endif
+ RecordTransactionCommit();
}
/*
/*-------------------------------------------------------------------------
*
- * bufmgr.c
+ * xlog_bufmgr.c
* buffer manager interface routines
*
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/storage/buffer/bufmgr.c,v 1.96 2000/11/30 01:39:07 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/storage/buffer/bufmgr.c,v 1.97 2000/11/30 08:46:23 vadim Exp $
*
*-------------------------------------------------------------------------
*/
*
* WriteBuffer() -- WriteNoReleaseBuffer() + ReleaseBuffer()
*
- * FlushBuffer() -- Write buffer immediately. Can unpin, or not,
- * depending on parameter.
- *
* BufferSync() -- flush all dirty buffers in the buffer pool.
*
* InitBufferPool() -- Init the buffer module.
* freelist.c -- chooses victim for buffer replacement
* buf_table.c -- manages the buffer lookup table
*/
-
#include "postgres.h"
-#ifdef XLOG
-#include "xlog_bufmgr.c"
-#else
-
#include
#include
#include
#include "storage/s_lock.h"
#include "storage/smgr.h"
#include "utils/relcache.h"
-
-#ifdef XLOG
#include "catalog/pg_database.h"
-#endif
+
+#define BufferGetLSN(bufHdr) \
+ (*((XLogRecPtr*)MAKE_PTR((bufHdr)->data)))
+
extern SPINLOCK BufMgrLock;
extern long int ReadBufferCount;
bool bufferLockHeld);
static BufferDesc *BufferAlloc(Relation reln, BlockNumber blockNum,
bool *foundPtr, bool bufferLockHeld);
-static void SetBufferDirtiedByMe(Buffer buffer, BufferDesc *bufHdr);
-static void ClearBufferDirtiedByMe(Buffer buffer, BufferDesc *bufHdr);
-static void BufferSync(void);
static int BufferReplace(BufferDesc *bufHdr);
void PrintBufferDescs(void);
return ReadBufferWithBufferLock(reln, blockNum, false);
}
-/*
- * is_userbuffer
- *
- * XXX caller must have already acquired BufMgrLock
- */
-#ifdef NOT_USED
-static bool
-is_userbuffer(Buffer buffer)
-{
- BufferDesc *buf = &BufferDescriptors[buffer - 1];
-
- if (IsSystemRelationName(buf->blind.relname))
- return false;
- return true;
-}
-
-#endif
-
-#ifdef NOT_USED
-Buffer
-ReadBuffer_Debug(char *file,
- int line,
- Relation reln,
- BlockNumber blockNum)
-{
- Buffer buffer;
-
- buffer = ReadBufferWithBufferLock(reln, blockNum, false);
- if (ShowPinTrace && !BufferIsLocal(buffer) && is_userbuffer(buffer))
- {
- BufferDesc *buf = &BufferDescriptors[buffer - 1];
-
- fprintf(stderr, "PIN(RD) %ld relname = %s, blockNum = %d, \
-refcount = %ld, file: %s, line: %d\n",
- buffer, buf->blind.relname, buf->tag.blockNum,
- PrivateRefCount[buffer - 1], file, line);
- }
- return buffer;
-}
-
-#endif
-
/*
* ReadBufferWithBufferLock -- does the work of
* ReadBuffer() but with the possibility that
buf->refcount = 1;
PrivateRefCount[BufferDescriptorGetBuffer(buf) - 1] = 1;
- if (buf->flags & BM_DIRTY)
+ if (buf->flags & BM_DIRTY || buf->cntxDirty)
{
bool smok;
}
else
{
-
/*
* BM_JUST_DIRTIED cleared by BufferReplace and shouldn't
* be setted by anyone. - vadim 01/17/97
*/
if (buf->flags & BM_JUST_DIRTIED)
{
- elog(FATAL, "BufferAlloc: content of block %u (%s) changed while flushing",
+ elog(STOP, "BufferAlloc: content of block %u (%s) changed while flushing",
buf->tag.blockNum, buf->blind.relname);
}
else
buf->flags &= ~BM_DIRTY;
+ buf->cntxDirty = false;
}
/*
SpinAcquire(BufMgrLock);
Assert(bufHdr->refcount > 0);
+
bufHdr->flags |= (BM_DIRTY | BM_JUST_DIRTIED);
- SetBufferDirtiedByMe(buffer, bufHdr);
+
UnpinBuffer(bufHdr);
SpinRelease(BufMgrLock);
return TRUE;
}
-#ifdef NOT_USED
-void
-WriteBuffer_Debug(char *file, int line, Buffer buffer)
-{
- WriteBuffer(buffer);
- if (ShowPinTrace && BufferIsLocal(buffer) && is_userbuffer(buffer))
- {
- BufferDesc *buf;
-
- buf = &BufferDescriptors[buffer - 1];
- fprintf(stderr, "UNPIN(WR) %ld relname = %s, blockNum = %d, \
-refcount = %ld, file: %s, line: %d\n",
- buffer, buf->blind.relname, buf->tag.blockNum,
- PrivateRefCount[buffer - 1], file, line);
- }
-}
-
-#endif
-
-/*
- * FlushBuffer -- like WriteBuffer, but write the page immediately,
- * rather than just marking it dirty. On success return, the buffer will
- * no longer be dirty.
- *
- * 'buffer' is known to be dirty/pinned, so there should not be a
- * problem reading the BufferDesc members without the BufMgrLock
- * (nobody should be able to change tags out from under us).
- *
- * If 'sync' is true, a synchronous write is wanted (wait for buffer to hit
- * the disk). Otherwise it's sufficient to issue the kernel write call.
- *
- * Unpin buffer if 'release' is true.
- */
-int
-FlushBuffer(Buffer buffer, bool sync, bool release)
-{
- BufferDesc *bufHdr;
- Relation bufrel;
- int status;
-
- if (BufferIsLocal(buffer))
- return FlushLocalBuffer(buffer, sync, release) ? STATUS_OK : STATUS_ERROR;
-
- if (BAD_BUFFER_ID(buffer))
- return STATUS_ERROR;
-
- Assert(PrivateRefCount[buffer - 1] > 0); /* else caller didn't pin */
-
- bufHdr = &BufferDescriptors[buffer - 1];
-
- bufrel = RelationNodeCacheGetRelation(bufHdr->tag.rnode);
-
- Assert(bufrel != (Relation) NULL);
-
- SharedBufferChanged = true;
-
- /* To check if block content changed while flushing. - vadim 01/17/97 */
- SpinAcquire(BufMgrLock);
- WaitIO(bufHdr, BufMgrLock); /* confirm end of IO */
- bufHdr->flags &= ~BM_JUST_DIRTIED;
- StartBufferIO(bufHdr, false); /* output IO start */
-
- SpinRelease(BufMgrLock);
-
- /*
- * Grab a read lock on the buffer to ensure that no
- * other backend changes its contents while we write it;
- * see comments in BufferSync().
- */
- LockBuffer(BufferDescriptorGetBuffer(bufHdr), BUFFER_LOCK_SHARE);
-
- if (sync)
- status = smgrflush(DEFAULT_SMGR, bufrel, bufHdr->tag.blockNum,
- (char *) MAKE_PTR(bufHdr->data));
- else
- status = smgrwrite(DEFAULT_SMGR, bufrel, bufHdr->tag.blockNum,
- (char *) MAKE_PTR(bufHdr->data));
-
- LockBuffer(BufferDescriptorGetBuffer(bufHdr), BUFFER_LOCK_UNLOCK);
-
- /* drop relcache refcnt incremented by RelationNodeCacheGetRelation */
- RelationDecrementReferenceCount(bufrel);
-
- if (status == SM_FAIL)
- {
- elog(ERROR, "FlushBuffer: cannot flush block %u of the relation %s",
- bufHdr->tag.blockNum, bufHdr->blind.relname);
- return STATUS_ERROR;
- }
- BufferFlushCount++;
-
- SpinAcquire(BufMgrLock);
- bufHdr->flags &= ~BM_IO_IN_PROGRESS; /* mark IO finished */
- TerminateBufferIO(bufHdr); /* output IO finished */
-
- /*
- * If this buffer was marked by someone as DIRTY while we were
- * flushing it out we must not clear shared DIRTY flag - vadim
- * 01/17/97
- *
- * ... but we can clear BufferDirtiedByMe anyway - tgl 3/31/00
- */
- if (bufHdr->flags & BM_JUST_DIRTIED)
- {
- elog(NOTICE, "FlushBuffer: content of block %u (%s) changed while flushing",
- bufHdr->tag.blockNum, bufHdr->blind.relname);
- }
- else
- bufHdr->flags &= ~BM_DIRTY;
- ClearBufferDirtiedByMe(buffer, bufHdr);
- if (release)
- UnpinBuffer(bufHdr);
- SpinRelease(BufMgrLock);
-
- return STATUS_OK;
-}
-
/*
* WriteNoReleaseBuffer -- like WriteBuffer, but do not unpin the buffer
* when the operation is complete.
SpinAcquire(BufMgrLock);
Assert(bufHdr->refcount > 0);
+
bufHdr->flags |= (BM_DIRTY | BM_JUST_DIRTIED);
- SetBufferDirtiedByMe(buffer, bufHdr);
+
SpinRelease(BufMgrLock);
return STATUS_OK;
}
/*
- * SetBufferDirtiedByMe -- mark a shared buffer as being dirtied by this xact
- *
- * This flag essentially remembers that we need to write and fsync this buffer
- * before we can commit the transaction. The write might end up getting done
- * by another backend, but we must do the fsync ourselves (else we could
- * commit before the data actually reaches disk). We do not issue fsync
- * instantly upon write; the storage manager keeps track of which files need
- * to be fsync'd before commit can occur. A key aspect of this data structure
- * is that we will be able to notify the storage manager that an fsync is
- * needed even after another backend has done the physical write and replaced
- * the buffer contents with something else!
+ * BufferSync -- Write all dirty buffers in the pool.
*
- * NB: we must be holding the bufmgr lock at entry, and the buffer must be
- * pinned so that no other backend can take it away from us.
+ * This is called at checkpoint time and write out all dirty buffers.
*/
-static void
-SetBufferDirtiedByMe(Buffer buffer, BufferDesc *bufHdr)
-{
- BufferTag *tagLastDirtied = &BufferTagLastDirtied[buffer - 1];
- Relation reln;
- int status;
-
- /*
- * If the flag is already set, check to see whether the buffertag is
- * the same. If not, some other backend already wrote the buffer data
- * that we dirtied. We must tell the storage manager to make an fsync
- * pending on that file before we can overwrite the old tag value.
- */
- if (BufferDirtiedByMe[buffer - 1])
- {
- if (RelFileNodeEquals(bufHdr->tag.rnode, tagLastDirtied->rnode) &&
- bufHdr->tag.blockNum == tagLastDirtied->blockNum)
- return; /* Same tag already dirtied, so no work */
-
-#ifndef OPTIMIZE_SINGLE
- SpinRelease(BufMgrLock);
-#endif /* OPTIMIZE_SINGLE */
-
- reln = RelationNodeCacheGetRelation(tagLastDirtied->rnode);
-
- if (reln == (Relation) NULL)
- {
- status = smgrblindmarkdirty(DEFAULT_SMGR,
- tagLastDirtied->rnode,
- tagLastDirtied->blockNum);
- }
- else
- {
- Assert(RelFileNodeEquals(tagLastDirtied->rnode, reln->rd_node));
- status = smgrmarkdirty(DEFAULT_SMGR, reln,
- tagLastDirtied->blockNum);
-
- /*
- * drop relcache refcnt incremented by
- * RelationNodeCacheGetRelation
- */
- RelationDecrementReferenceCount(reln);
- }
- if (status == SM_FAIL)
- {
- elog(ERROR, "SetBufferDirtiedByMe: cannot mark %u for %s",
- tagLastDirtied->blockNum,
- BufferBlindLastDirtied[buffer - 1].relname);
- }
-
-#ifndef OPTIMIZE_SINGLE
- SpinAcquire(BufMgrLock);
-#endif /* OPTIMIZE_SINGLE */
-
- }
-
- *tagLastDirtied = bufHdr->tag;
- BufferBlindLastDirtied[buffer - 1] = bufHdr->blind;
- BufferDirtiedByMe[buffer - 1] = true;
-}
-
-/*
- * ClearBufferDirtiedByMe -- mark a shared buffer as no longer needing fsync
- *
- * If we write out a buffer ourselves, then the storage manager will set its
- * needs-fsync flag for that file automatically, and so we can clear our own
- * flag that says it needs to be done later.
- *
- * NB: we must be holding the bufmgr lock at entry.
- */
-static void
-ClearBufferDirtiedByMe(Buffer buffer, BufferDesc *bufHdr)
-{
- BufferTag *tagLastDirtied = &BufferTagLastDirtied[buffer - 1];
-
- /*
- * Do *not* clear the flag if it refers to some other buffertag than
- * the data we just wrote. This is unlikely, but possible if some
- * other backend replaced the buffer contents since we set our flag.
- */
- if (RelFileNodeEquals(bufHdr->tag.rnode, tagLastDirtied->rnode) &&
- bufHdr->tag.blockNum == tagLastDirtied->blockNum)
- BufferDirtiedByMe[buffer - 1] = false;
-}
-
-/*
- * BufferSync -- Flush all dirty buffers in the pool.
- *
- * This is called at transaction commit time. We find all buffers
- * that have been dirtied by the current xact and flush them to disk.
- * We do *not* flush dirty buffers that have been dirtied by other xacts.
- * (This is a substantial change from pre-7.0 behavior.)
- */
-static void
+void
BufferSync()
{
int i;
BufferDesc *bufHdr;
+ Buffer buffer;
int status;
- Relation reln;
- bool didwrite;
+ RelFileNode rnode;
+ XLogRecPtr recptr;
+ Relation reln = NULL;
for (i = 0, bufHdr = BufferDescriptors; i < NBuffers; i++, bufHdr++)
{
- /* Ignore buffers that were not dirtied by me */
- if (!BufferDirtiedByMe[i])
- continue;
SpinAcquire(BufMgrLock);
- /*
- * We only need to write if the buffer is still dirty and still
- * contains the same disk page that it contained when we dirtied
- * it. Otherwise, someone else has already written our changes for
- * us, and we need only fsync.
- *
- * (NOTE: it's still possible to do an unnecessary write, if other
- * xacts have written and then re-dirtied the page since our last
- * change to it. But that should be pretty uncommon, and there's
- * no easy way to detect it anyway.)
- */
- reln = NULL;
- didwrite = false;
- if ((bufHdr->flags & BM_VALID) && (bufHdr->flags & BM_DIRTY))
+ if (!(bufHdr->flags & BM_VALID))
{
- if (RelFileNodeEquals(bufHdr->tag.rnode, BufferTagLastDirtied[i].rnode) &&
- bufHdr->tag.blockNum == BufferTagLastDirtied[i].blockNum)
- {
- /*
- * Try to find relation for buf. This could fail, if the
- * rel has been flushed from the relcache since we dirtied
- * the page. That should be uncommon, so paying the extra
- * cost of a blind write when it happens seems OK.
- */
- if (!InRecovery)
- reln = RelationNodeCacheGetRelation(bufHdr->tag.rnode);
-
- /*
- * We have to pin buffer to keep anyone from stealing it
- * from the buffer pool while we are flushing it or
- * waiting in WaitIO. It's bad for GetFreeBuffer in
- * BufferAlloc, but there is no other way to prevent
- * writing into disk block data from some other buffer,
- * getting smgr status of some other block and clearing
- * BM_DIRTY of ... - VAdim 09/16/96
- */
- PinBuffer(bufHdr);
- if (bufHdr->flags & BM_IO_IN_PROGRESS)
- {
- WaitIO(bufHdr, BufMgrLock);
- UnpinBuffer(bufHdr);
- if (bufHdr->flags & BM_IO_ERROR)
- {
- elog(ERROR, "BufferSync: write error %u for %s",
- bufHdr->tag.blockNum, bufHdr->blind.relname);
- }
- }
- else
- {
-
- /*
- * To check if block content changed while flushing
- * (see below). - vadim 01/17/97
- */
- WaitIO(bufHdr, BufMgrLock); /* confirm end of IO */
- bufHdr->flags &= ~BM_JUST_DIRTIED;
- StartBufferIO(bufHdr, false); /* output IO start */
-
- SpinRelease(BufMgrLock);
-
- /*
- * Grab a read lock on the buffer to ensure that no
- * other backend changes its contents while we write it;
- * otherwise we could write a non-self-consistent page
- * image to disk, which'd be bad news if the other
- * transaction aborts before writing its changes.
- *
- * Note that we still need the BM_JUST_DIRTIED mechanism
- * in case someone dirties the buffer just before we
- * grab this lock or just after we release it.
- */
- LockBuffer(BufferDescriptorGetBuffer(bufHdr),
- BUFFER_LOCK_SHARE);
+ SpinRelease(BufMgrLock);
+ continue;
+ }
- /*
- * If we didn't have the reldesc in our local cache,
- * write this page out using the 'blind write' storage
- * manager routine. If we did find it, use the
- * standard interface.
- */
- if (reln == (Relation) NULL)
- {
- status = smgrblindwrt(DEFAULT_SMGR,
- bufHdr->tag.rnode,
- bufHdr->tag.blockNum,
- (char *) MAKE_PTR(bufHdr->data),
- true); /* must fsync */
- }
- else
- {
- status = smgrwrite(DEFAULT_SMGR, reln,
- bufHdr->tag.blockNum,
- (char *) MAKE_PTR(bufHdr->data));
- }
+ /*
+ * Pin buffer and ensure that no one reads it from disk
+ */
+ PinBuffer(bufHdr);
+ /* Synchronize with BufferAlloc */
+ if (bufHdr->flags & BM_IO_IN_PROGRESS)
+ WaitIO(bufHdr, BufMgrLock);
- /*
- * Release the per-buffer readlock, reacquire BufMgrLock.
- */
- LockBuffer(BufferDescriptorGetBuffer(bufHdr),
- BUFFER_LOCK_UNLOCK);
+ buffer = BufferDescriptorGetBuffer(bufHdr);
+ rnode = bufHdr->tag.rnode;
- SpinAcquire(BufMgrLock);
+ SpinRelease(BufMgrLock);
- UnpinBuffer(bufHdr);
- if (status == SM_FAIL)
- {
- bufHdr->flags |= BM_IO_ERROR;
- elog(ERROR, "BufferSync: cannot write %u for %s",
- bufHdr->tag.blockNum, bufHdr->blind.relname);
- }
- bufHdr->flags &= ~BM_IO_IN_PROGRESS; /* mark IO finished */
- TerminateBufferIO(bufHdr); /* Sync IO finished */
- BufferFlushCount++;
- didwrite = true;
+ /*
+ * Try to find relation for buffer
+ */
+ reln = RelationNodeCacheGetRelation(rnode);
- /*
- * If this buffer was marked by someone as DIRTY while
- * we were flushing it out we must not clear DIRTY
- * flag - vadim 01/17/97
- *
- * but it is OK to clear BufferDirtiedByMe - tgl 3/31/00
- */
- if (!(bufHdr->flags & BM_JUST_DIRTIED))
- bufHdr->flags &= ~BM_DIRTY;
- }
+ /*
+ * Protect buffer content against concurrent update
+ */
+ LockBuffer(buffer, BUFFER_LOCK_SHARE);
- /* drop refcnt obtained by RelationNodeCacheGetRelation */
- if (reln != (Relation) NULL)
- RelationDecrementReferenceCount(reln);
- }
- }
+ /*
+ * Force XLOG flush for buffer' LSN
+ */
+ recptr = BufferGetLSN(bufHdr);
+ XLogFlush(recptr);
/*
- * If we did not write the buffer (because someone else did), we
- * must still fsync the file containing it, to ensure that the
- * write is down to disk before we commit.
+ * Now it's safe to write buffer to disk
+ * (if needed at all -:))
*/
- if (!didwrite)
+
+ SpinAcquire(BufMgrLock);
+ if (bufHdr->flags & BM_IO_IN_PROGRESS)
+ WaitIO(bufHdr, BufMgrLock);
+
+ if (bufHdr->flags & BM_DIRTY || bufHdr->cntxDirty)
{
-#ifndef OPTIMIZE_SINGLE
+ bufHdr->flags &= ~BM_JUST_DIRTIED;
+ StartBufferIO(bufHdr, false); /* output IO start */
+
SpinRelease(BufMgrLock);
-#endif /* OPTIMIZE_SINGLE */
- reln = RelationNodeCacheGetRelation(BufferTagLastDirtied[i].rnode);
if (reln == (Relation) NULL)
{
- status = smgrblindmarkdirty(DEFAULT_SMGR,
- BufferTagLastDirtied[i].rnode,
- BufferTagLastDirtied[i].blockNum);
+ status = smgrblindwrt(DEFAULT_SMGR,
+ bufHdr->tag.rnode,
+ bufHdr->tag.blockNum,
+ (char *) MAKE_PTR(bufHdr->data),
+ true); /* must fsync */
}
else
{
- status = smgrmarkdirty(DEFAULT_SMGR, reln,
- BufferTagLastDirtied[i].blockNum);
+ status = smgrwrite(DEFAULT_SMGR, reln,
+ bufHdr->tag.blockNum,
+ (char *) MAKE_PTR(bufHdr->data));
+ }
- /*
- * drop relcache refcnt incremented by
- * RelationNodeCacheGetRelation
- */
- RelationDecrementReferenceCount(reln);
+ if (status == SM_FAIL) /* disk failure ?! */
+ elog(STOP, "BufferSync: cannot write %u for %s",
+ bufHdr->tag.blockNum, bufHdr->blind.relname);
+
+ /*
+ * Note that it's safe to change cntxDirty here because of
+ * we protect it from upper writers by share lock and from
+ * other bufmgr routines by BM_IO_IN_PROGRESS
+ */
+ bufHdr->cntxDirty = false;
+
+ /*
+ * Release the per-buffer readlock, reacquire BufMgrLock.
+ */
+ LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
+ BufferFlushCount++;
- }
-#ifndef OPTIMIZE_SINGLE
SpinAcquire(BufMgrLock);
-#endif /* OPTIMIZE_SINGLE */
+
+ bufHdr->flags &= ~BM_IO_IN_PROGRESS; /* mark IO finished */
+ TerminateBufferIO(bufHdr); /* Sync IO finished */
+
+ /*
+ * If this buffer was marked by someone as DIRTY while
+ * we were flushing it out we must not clear DIRTY
+ * flag - vadim 01/17/97
+ */
+ if (!(bufHdr->flags & BM_JUST_DIRTIED))
+ bufHdr->flags &= ~BM_DIRTY;
}
+ else
+ LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
- BufferDirtiedByMe[i] = false;
+ UnpinBuffer(bufHdr);
SpinRelease(BufMgrLock);
+
+ /* drop refcnt obtained by RelationNodeCacheGetRelation */
+ if (reln != (Relation) NULL)
+ {
+ RelationDecrementReferenceCount(reln);
+ reln = NULL;
+ }
}
-#ifndef XLOG
- LocalBufferSync();
-#endif
-}
+}
/*
* WaitIO -- Block until the IO_IN_PROGRESS flag on 'buf' is cleared.
SpinRelease(BufMgrLock);
}
PrivateRefCount[i] = 0;
-
- if (!isCommit)
- BufferDirtiedByMe[i] = false;
}
ResetLocalBufferPool();
}
/* ------------------------------------------------
- * FlushBufferPool
- *
- * flush all dirty blocks in buffer pool to disk
+ * FlushBufferPool
*
+ * Flush all dirty blocks in buffer pool to disk
+ * at the checkpoint time
* ------------------------------------------------
*/
void
FlushBufferPool(void)
{
BufferSync();
+ smgrsync();
+}
+
+/*
+ * At the commit time we have to flush local buffer pool only
+ */
+void
+BufmgrCommit(void)
+{
+ LocalBufferSync();
+ /*
+ * All files created in current transaction will be fsync-ed
+ */
smgrcommit();
}
*
* Write out the buffer corresponding to 'bufHdr'
*
- * This routine used to flush the data to disk (ie, force immediate fsync)
- * but that's no longer necessary because BufferSync is smarter than before.
- *
* BufMgrLock must be held at entry, and the buffer must be pinned.
*/
static int
BufferReplace(BufferDesc *bufHdr)
{
Relation reln;
+ XLogRecPtr recptr;
int status;
- /*
- * first try to find the reldesc in the cache, if no luck, don't
- * bother to build the reldesc from scratch, just do a blind write.
- */
-
- reln = RelationNodeCacheGetRelation(bufHdr->tag.rnode);
-
/* To check if block content changed while flushing. - vadim 01/17/97 */
bufHdr->flags &= ~BM_JUST_DIRTIED;
SpinRelease(BufMgrLock);
/*
- * Grab a read lock on the buffer to ensure that no
- * other backend changes its contents while we write it;
- * see comments in BufferSync().
+ * No need to lock buffer context - no one should be able to
+ * end ReadBuffer
*/
- LockBuffer(BufferDescriptorGetBuffer(bufHdr), BUFFER_LOCK_SHARE);
+ recptr = BufferGetLSN(bufHdr);
+ XLogFlush(recptr);
+
+ reln = RelationNodeCacheGetRelation(bufHdr->tag.rnode);
if (reln != (Relation) NULL)
{
false); /* no fsync */
}
- LockBuffer(BufferDescriptorGetBuffer(bufHdr), BUFFER_LOCK_UNLOCK);
-
- SpinAcquire(BufMgrLock);
-
/* drop relcache refcnt incremented by RelationNodeCacheGetRelation */
if (reln != (Relation) NULL)
RelationDecrementReferenceCount(reln);
+ SpinAcquire(BufMgrLock);
+
if (status == SM_FAIL)
return FALSE;
- /*
- * If we had marked this buffer as needing to be fsync'd, we can
- * forget about that, because it's now the storage manager's
- * responsibility (but only if we called smgrwrite, not smgrblindwrt).
- */
- if (reln != (Relation) NULL)
- ClearBufferDirtiedByMe(BufferDescriptorGetBuffer(bufHdr), bufHdr);
-
BufferFlushCount++;
return TRUE;
RelationGetNumberOfBlocks(Relation relation)
{
return ((relation->rd_myxactonly) ? relation->rd_nblocks :
- smgrnblocks(DEFAULT_SMGR, relation));
+ ((relation->rd_rel->relkind == RELKIND_VIEW) ? 0 :
+ smgrnblocks(DEFAULT_SMGR, relation)));
}
/* ---------------------------------------------------------------------
if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
{
bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
+ bufHdr->cntxDirty = false;
LocalRefCount[i] = 0;
bufHdr->tag.rnode.relNode = InvalidOid;
}
}
/* Now we can do what we came for */
bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
+ bufHdr->cntxDirty = false;
/*
* Release any refcount we may have.
*/
BufTableDelete(bufHdr);
}
-
- /*
- * Also check to see if BufferDirtiedByMe info for this buffer
- * refers to the target relation, and clear it if so. This is
- * independent of whether the current contents of the buffer
- * belong to the target relation!
- *
- * NOTE: we have no way to clear BufferDirtiedByMe info in other
- * backends, but hopefully there are none with that bit set for
- * this rel, since we hold exclusive lock on this rel.
- */
- if (RelFileNodeEquals(rel->rd_node,
- BufferTagLastDirtied[i - 1].rnode))
- BufferDirtiedByMe[i - 1] = false;
}
SpinRelease(BufMgrLock);
if (RelFileNodeEquals(bufHdr->tag.rnode, rnode))
{
bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
+ bufHdr->cntxDirty = false;
LocalRefCount[i] = 0;
bufHdr->tag.rnode.relNode = InvalidOid;
}
}
/* Now we can do what we came for */
bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
+ bufHdr->cntxDirty = false;
/*
* Release any refcount we may have.
*/
BufTableDelete(bufHdr);
}
-
- /*
- * Also check to see if BufferDirtiedByMe info for this buffer
- * refers to the target relation, and clear it if so. This is
- * independent of whether the current contents of the buffer
- * belong to the target relation!
- *
- * NOTE: we have no way to clear BufferDirtiedByMe info in other
- * backends, but hopefully there are none with that bit set for
- * this rel, since we hold exclusive lock on this rel.
- */
- if (RelFileNodeEquals(rnode,
- BufferTagLastDirtied[i - 1].rnode))
- BufferDirtiedByMe[i - 1] = false;
}
SpinRelease(BufMgrLock);
}
/* Now we can do what we came for */
bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
+ bufHdr->cntxDirty = false;
/*
* The thing should be free, if caller has checked that no
*/
BufTableDelete(bufHdr);
}
- /*
- * Also check to see if BufferDirtiedByMe info for this buffer
- * refers to the target database, and clear it if so. This is
- * independent of whether the current contents of the buffer
- * belong to the target database!
- *
- * (Actually, this is probably unnecessary, since I shouldn't have
- * ever dirtied pages of the target database, but...)
- */
- if (BufferTagLastDirtied[i - 1].rnode.tblNode == dbid)
- BufferDirtiedByMe[i - 1] = false;
}
SpinRelease(BufMgrLock);
}
{
int i;
BufferDesc *bufHdr;
+ XLogRecPtr recptr;
+ int status;
if (rel->rd_myxactonly)
{
bufHdr = &LocalBufferDescriptors[i];
if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
{
- if (bufHdr->flags & BM_DIRTY)
+ if (bufHdr->flags & BM_DIRTY || bufHdr->cntxDirty)
{
- if (FlushBuffer(-i - 1, false, false) != STATUS_OK)
+ status = smgrwrite(DEFAULT_SMGR, rel,
+ bufHdr->tag.blockNum,
+ (char *) MAKE_PTR(bufHdr->data));
+ if (status == SM_FAIL)
{
elog(NOTICE, "FlushRelationBuffers(%s (local), %u): block %u is dirty, could not flush it",
RelationGetRelationName(rel), firstDelBlock,
bufHdr->tag.blockNum);
- return -1;
+ return(-1);
}
+ bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
+ bufHdr->cntxDirty = false;
}
if (LocalRefCount[i] > 0)
{
elog(NOTICE, "FlushRelationBuffers(%s (local), %u): block %u is referenced (%ld)",
RelationGetRelationName(rel), firstDelBlock,
bufHdr->tag.blockNum, LocalRefCount[i]);
- return -2;
+ return(-2);
}
if (bufHdr->tag.blockNum >= firstDelBlock)
{
bufHdr = &BufferDescriptors[i];
if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
{
- if (bufHdr->flags & BM_DIRTY)
+ if (bufHdr->flags & BM_DIRTY || bufHdr->cntxDirty)
{
PinBuffer(bufHdr);
+ if (bufHdr->flags & BM_IO_IN_PROGRESS)
+ WaitIO(bufHdr, BufMgrLock);
SpinRelease(BufMgrLock);
- if (FlushBuffer(i + 1, false, false) != STATUS_OK)
+
+ /*
+ * Force XLOG flush for buffer' LSN
+ */
+ recptr = BufferGetLSN(bufHdr);
+ XLogFlush(recptr);
+
+ /*
+ * Now it's safe to write buffer to disk
+ */
+
+ SpinAcquire(BufMgrLock);
+ if (bufHdr->flags & BM_IO_IN_PROGRESS)
+ WaitIO(bufHdr, BufMgrLock);
+
+ if (bufHdr->flags & BM_DIRTY || bufHdr->cntxDirty)
{
- SpinAcquire(BufMgrLock);
- UnpinBuffer(bufHdr);
+ bufHdr->flags &= ~BM_JUST_DIRTIED;
+ StartBufferIO(bufHdr, false); /* output IO start */
+
SpinRelease(BufMgrLock);
- elog(NOTICE, "FlushRelationBuffers(%s, %u): block %u is dirty (private %ld, global %d), could not flush it",
- RelationGetRelationName(rel), firstDelBlock,
- bufHdr->tag.blockNum,
- PrivateRefCount[i], bufHdr->refcount);
- return -1;
+
+ status = smgrwrite(DEFAULT_SMGR, rel,
+ bufHdr->tag.blockNum,
+ (char *) MAKE_PTR(bufHdr->data));
+
+ if (status == SM_FAIL) /* disk failure ?! */
+ elog(STOP, "FlushRelationBuffers: cannot write %u for %s",
+ bufHdr->tag.blockNum, bufHdr->blind.relname);
+
+ BufferFlushCount++;
+
+ SpinAcquire(BufMgrLock);
+ bufHdr->flags &= ~BM_IO_IN_PROGRESS;
+ TerminateBufferIO(bufHdr);
+ Assert(!(bufHdr->flags & BM_JUST_DIRTIED));
+ bufHdr->flags &= ~BM_DIRTY;
+ /*
+ * Note that it's safe to change cntxDirty here because
+ * of we protect it from upper writers by
+ * AccessExclusiveLock and from other bufmgr routines
+ * by BM_IO_IN_PROGRESS
+ */
+ bufHdr->cntxDirty = false;
}
- SpinAcquire(BufMgrLock);
UnpinBuffer(bufHdr);
}
if (!(bufHdr->flags & BM_FREE))
}
buf->w_lock = true;
*buflock |= BL_W_LOCK;
+
+ buf->cntxDirty = true;
+
if (*buflock & BL_RI_LOCK)
{
Assert(buf->flags & BM_IO_IN_PROGRESS);
SpinAcquire(BufMgrLock);
if (IsForInput)
- Assert(!(buf->flags & BM_DIRTY));
+ Assert(!(buf->flags & BM_DIRTY) && !(buf->cntxDirty));
else
{
- Assert((buf->flags & BM_DIRTY) != 0);
- if ((buf->flags & BM_IO_ERROR) != 0)
+ Assert(buf->flags & BM_DIRTY || buf->cntxDirty);
+ if (buf->flags & BM_IO_ERROR)
{
elog(NOTICE, "write error may be permanent: cannot write block %u for %s/%s",
buf->tag.blockNum, buf->blind.dbname, buf->blind.relname);
SpinRelease(BufMgrLock);
return;
}
-
-#endif /* ! XLOG */
+++ /dev/null
-/*-------------------------------------------------------------------------
- *
- * xlog_bufmgr.c
- * buffer manager interface routines
- *
- * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- *
- * IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/storage/buffer/Attic/xlog_bufmgr.c,v 1.6 2000/11/30 01:39:07 tgl Exp $
- *
- *-------------------------------------------------------------------------
- */
-/*
- *
- * BufferAlloc() -- lookup a buffer in the buffer table. If
- * it isn't there add it, but do not read data into memory.
- * This is used when we are about to reinitialize the
- * buffer so don't care what the current disk contents are.
- * BufferAlloc() also pins the new buffer in memory.
- *
- * ReadBuffer() -- like BufferAlloc() but reads the data
- * on a buffer cache miss.
- *
- * ReleaseBuffer() -- unpin the buffer
- *
- * WriteNoReleaseBuffer() -- mark the buffer contents as "dirty"
- * but don't unpin. The disk IO is delayed until buffer
- * replacement.
- *
- * WriteBuffer() -- WriteNoReleaseBuffer() + ReleaseBuffer()
- *
- * BufferSync() -- flush all dirty buffers in the buffer pool.
- *
- * InitBufferPool() -- Init the buffer module.
- *
- * See other files:
- * freelist.c -- chooses victim for buffer replacement
- * buf_table.c -- manages the buffer lookup table
- */
-#include "postgres.h"
-
-#include
-#include
-#include
-#include
-
-#include "executor/execdebug.h"
-#include "miscadmin.h"
-#include "storage/buf_internals.h"
-#include "storage/bufmgr.h"
-#include "storage/s_lock.h"
-#include "storage/smgr.h"
-#include "utils/relcache.h"
-
-#ifdef XLOG
-#include "catalog/pg_database.h"
-#endif
-
-#define BufferGetLSN(bufHdr) \
- (*((XLogRecPtr*)MAKE_PTR((bufHdr)->data)))
-
-
-extern SPINLOCK BufMgrLock;
-extern long int ReadBufferCount;
-extern long int ReadLocalBufferCount;
-extern long int BufferHitCount;
-extern long int LocalBufferHitCount;
-extern long int BufferFlushCount;
-extern long int LocalBufferFlushCount;
-
-/*
- * It's used to avoid disk writes for read-only transactions
- * (i.e. when no one shared buffer was changed by transaction).
- * We set it to true in WriteBuffer/WriteNoReleaseBuffer when
- * marking shared buffer as dirty. We set it to false in xact.c
- * after transaction is committed/aborted.
- */
-bool SharedBufferChanged = false;
-
-static void WaitIO(BufferDesc *buf, SPINLOCK spinlock);
-static void StartBufferIO(BufferDesc *buf, bool forInput);
-static void TerminateBufferIO(BufferDesc *buf);
-static void ContinueBufferIO(BufferDesc *buf, bool forInput);
-extern void AbortBufferIO(void);
-
-/*
- * Macro : BUFFER_IS_BROKEN
- * Note that write error doesn't mean the buffer broken
-*/
-#define BUFFER_IS_BROKEN(buf) ((buf->flags & BM_IO_ERROR) && !(buf->flags & BM_DIRTY))
-
-static Buffer ReadBufferWithBufferLock(Relation relation, BlockNumber blockNum,
- bool bufferLockHeld);
-static BufferDesc *BufferAlloc(Relation reln, BlockNumber blockNum,
- bool *foundPtr, bool bufferLockHeld);
-static int BufferReplace(BufferDesc *bufHdr);
-void PrintBufferDescs(void);
-
-/* ---------------------------------------------------
- * RelationGetBufferWithBuffer
- * see if the given buffer is what we want
- * if yes, we don't need to bother the buffer manager
- * ---------------------------------------------------
- */
-Buffer
-RelationGetBufferWithBuffer(Relation relation,
- BlockNumber blockNumber,
- Buffer buffer)
-{
- BufferDesc *bufHdr;
-
- if (BufferIsValid(buffer))
- {
- if (!BufferIsLocal(buffer))
- {
- bufHdr = &BufferDescriptors[buffer - 1];
- SpinAcquire(BufMgrLock);
- if (bufHdr->tag.blockNum == blockNumber &&
- RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node))
- {
- SpinRelease(BufMgrLock);
- return buffer;
- }
- return ReadBufferWithBufferLock(relation, blockNumber, true);
- }
- else
- {
- bufHdr = &LocalBufferDescriptors[-buffer - 1];
- if (bufHdr->tag.blockNum == blockNumber &&
- RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node))
- return buffer;
- }
- }
- return ReadBuffer(relation, blockNumber);
-}
-
-/*
- * 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.
- *
- * Returns: the buffer number for the buffer containing
- * the block read or NULL on an error.
- *
- * Assume when this function is called, that reln has been
- * opened already.
- */
-
-#undef ReadBuffer /* conflicts with macro when BUFMGR_DEBUG
- * defined */
-
-/*
- * ReadBuffer
- *
- */
-Buffer
-ReadBuffer(Relation reln, BlockNumber blockNum)
-{
- return ReadBufferWithBufferLock(reln, blockNum, false);
-}
-
-/*
- * ReadBufferWithBufferLock -- does the work of
- * ReadBuffer() but with the possibility that
- * the buffer lock has already been held. this
- * is yet another effort to reduce the number of
- * semops in the system.
- */
-static Buffer
-ReadBufferWithBufferLock(Relation reln,
- BlockNumber blockNum,
- bool bufferLockHeld)
-{
- BufferDesc *bufHdr;
- int extend; /* extending the file by one block */
- int status;
- bool found;
- bool isLocalBuf;
-
- extend = (blockNum == P_NEW);
- isLocalBuf = reln->rd_myxactonly;
-
- if (isLocalBuf)
- {
- ReadLocalBufferCount++;
- bufHdr = LocalBufferAlloc(reln, blockNum, &found);
- if (found)
- LocalBufferHitCount++;
- }
- else
- {
- ReadBufferCount++;
-
- /*
- * lookup the buffer. IO_IN_PROGRESS is set if the requested
- * block is not currently in memory.
- */
- bufHdr = BufferAlloc(reln, blockNum, &found, bufferLockHeld);
- if (found)
- BufferHitCount++;
- }
-
- if (!bufHdr)
- return InvalidBuffer;
-
- /* if it's already in the buffer pool, we're done */
- if (found)
- {
-
- /*
- * This happens when a bogus buffer was returned previously and is
- * floating around in the buffer pool. A routine calling this
- * would want this extended.
- */
- if (extend)
- {
- /* new buffers are zero-filled */
- MemSet((char *) MAKE_PTR(bufHdr->data), 0, BLCKSZ);
- smgrextend(DEFAULT_SMGR, reln,
- (char *) MAKE_PTR(bufHdr->data));
- }
- return BufferDescriptorGetBuffer(bufHdr);
-
- }
-
- /*
- * if we have gotten to this point, the reln pointer must be ok and
- * the relation file must be open.
- */
- if (extend)
- {
- /* new buffers are zero-filled */
- MemSet((char *) MAKE_PTR(bufHdr->data), 0, BLCKSZ);
- status = smgrextend(DEFAULT_SMGR, reln,
- (char *) MAKE_PTR(bufHdr->data));
- }
- else
- {
- status = smgrread(DEFAULT_SMGR, reln, blockNum,
- (char *) MAKE_PTR(bufHdr->data));
- }
-
- if (isLocalBuf)
- return BufferDescriptorGetBuffer(bufHdr);
-
- /* lock buffer manager again to update IO IN PROGRESS */
- SpinAcquire(BufMgrLock);
-
- if (status == SM_FAIL)
- {
- /* IO Failed. cleanup the data structures and go home */
-
- if (!BufTableDelete(bufHdr))
- {
- SpinRelease(BufMgrLock);
- elog(FATAL, "BufRead: buffer table broken after IO error\n");
- }
- /* remember that BufferAlloc() pinned the buffer */
- UnpinBuffer(bufHdr);
-
- /*
- * Have to reset the flag so that anyone waiting for the buffer
- * can tell that the contents are invalid.
- */
- bufHdr->flags |= BM_IO_ERROR;
- bufHdr->flags &= ~BM_IO_IN_PROGRESS;
- }
- else
- {
- /* IO Succeeded. clear the flags, finish buffer update */
-
- bufHdr->flags &= ~(BM_IO_ERROR | BM_IO_IN_PROGRESS);
- }
-
- /* If anyone was waiting for IO to complete, wake them up now */
- TerminateBufferIO(bufHdr);
-
- SpinRelease(BufMgrLock);
-
- if (status == SM_FAIL)
- return InvalidBuffer;
-
- return BufferDescriptorGetBuffer(bufHdr);
-}
-
-/*
- * BufferAlloc -- Get a buffer from the buffer pool but dont
- * read it.
- *
- * Returns: descriptor for buffer
- *
- * When this routine returns, the BufMgrLock is guaranteed NOT be held.
- */
-static BufferDesc *
-BufferAlloc(Relation reln,
- BlockNumber blockNum,
- bool *foundPtr,
- bool bufferLockHeld)
-{
- BufferDesc *buf,
- *buf2;
- BufferTag newTag; /* identity of requested block */
- bool inProgress; /* buffer undergoing IO */
- bool newblock = FALSE;
-
- /* create a new tag so we can lookup the buffer */
- /* assume that the relation is already open */
- if (blockNum == P_NEW)
- {
- newblock = TRUE;
- blockNum = smgrnblocks(DEFAULT_SMGR, reln);
- }
-
- INIT_BUFFERTAG(&newTag, reln, blockNum);
-
- if (!bufferLockHeld)
- SpinAcquire(BufMgrLock);
-
- /* see if the block is in the buffer pool already */
- buf = BufTableLookup(&newTag);
- if (buf != NULL)
- {
-
- /*
- * Found it. Now, (a) pin the buffer so no one steals it from the
- * buffer pool, (b) check IO_IN_PROGRESS, someone may be faulting
- * the buffer into the buffer pool.
- */
-
- PinBuffer(buf);
- inProgress = (buf->flags & BM_IO_IN_PROGRESS);
-
- *foundPtr = TRUE;
- if (inProgress) /* confirm end of IO */
- {
- WaitIO(buf, BufMgrLock);
- inProgress = (buf->flags & BM_IO_IN_PROGRESS);
- }
- if (BUFFER_IS_BROKEN(buf))
- {
-
- /*
- * I couldn't understand the following old comment. If there's
- * no IO for the buffer and the buffer is BROKEN,it should be
- * read again. So start a new buffer IO here.
- *
- * wierd race condition:
- *
- * We were waiting for someone else to read the buffer. While we
- * were waiting, the reader boof'd in some way, so the
- * contents of the buffer are still invalid. By saying that
- * we didn't find it, we can make the caller reinitialize the
- * buffer. If two processes are waiting for this block, both
- * will read the block. The second one to finish may
- * overwrite any updates made by the first. (Assume higher
- * level synchronization prevents this from happening).
- *
- * This is never going to happen, don't worry about it.
- */
- *foundPtr = FALSE;
- }
-#ifdef BMTRACE
- _bm_trace((reln->rd_rel->relisshared ? 0 : MyDatabaseId), RelationGetRelid(reln), blockNum, BufferDescriptorGetBuffer(buf), BMT_ALLOCFND);
-#endif /* BMTRACE */
-
- if (!(*foundPtr))
- StartBufferIO(buf, true);
- SpinRelease(BufMgrLock);
-
- return buf;
- }
-
- *foundPtr = FALSE;
-
- /*
- * Didn't find it in the buffer pool. We'll have to initialize a new
- * buffer. First, grab one from the free list. If it's dirty, flush
- * it to disk. Remember to unlock BufMgr spinlock while doing the IOs.
- */
- inProgress = FALSE;
- for (buf = (BufferDesc *) NULL; buf == (BufferDesc *) NULL;)
- {
- buf = GetFreeBuffer();
-
- /* GetFreeBuffer will abort if it can't find a free buffer */
- Assert(buf);
-
- /*
- * There should be exactly one pin on the buffer after it is
- * allocated -- ours. If it had a pin it wouldn't have been on
- * the free list. No one else could have pinned it between
- * GetFreeBuffer and here because we have the BufMgrLock.
- */
- Assert(buf->refcount == 0);
- buf->refcount = 1;
- PrivateRefCount[BufferDescriptorGetBuffer(buf) - 1] = 1;
-
- if (buf->flags & BM_DIRTY || buf->cntxDirty)
- {
- bool smok;
-
- /*
- * skip write error buffers
- */
- if ((buf->flags & BM_IO_ERROR) != 0)
- {
- PrivateRefCount[BufferDescriptorGetBuffer(buf) - 1] = 0;
- buf->refcount--;
- buf = (BufferDesc *) NULL;
- continue;
- }
- /*
- * Set BM_IO_IN_PROGRESS to keep anyone from doing anything
- * with the contents of the buffer while we write it out. We
- * don't really care if they try to read it, but if they can
- * complete a BufferAlloc on it they can then scribble into
- * it, and we'd really like to avoid that while we are
- * flushing the buffer. Setting this flag should block them
- * in WaitIO until we're done.
- */
- inProgress = TRUE;
-
- /*
- * All code paths that acquire this lock pin the buffer first;
- * since no one had it pinned (it just came off the free
- * list), no one else can have this lock.
- */
- StartBufferIO(buf, false);
-
- /*
- * Write the buffer out, being careful to release BufMgrLock
- * before starting the I/O.
- */
- smok = BufferReplace(buf);
-
- if (smok == FALSE)
- {
- elog(NOTICE, "BufferAlloc: cannot write block %u for %s/%s",
- buf->tag.blockNum, buf->blind.dbname, buf->blind.relname);
- inProgress = FALSE;
- buf->flags |= BM_IO_ERROR;
- buf->flags &= ~BM_IO_IN_PROGRESS;
- TerminateBufferIO(buf);
- PrivateRefCount[BufferDescriptorGetBuffer(buf) - 1] = 0;
- Assert(buf->refcount > 0);
- buf->refcount--;
- if (buf->refcount == 0)
- {
- AddBufferToFreelist(buf);
- buf->flags |= BM_FREE;
- }
- buf = (BufferDesc *) NULL;
- }
- else
- {
- /*
- * BM_JUST_DIRTIED cleared by BufferReplace and shouldn't
- * be setted by anyone. - vadim 01/17/97
- */
- if (buf->flags & BM_JUST_DIRTIED)
- {
- elog(STOP, "BufferAlloc: content of block %u (%s) changed while flushing",
- buf->tag.blockNum, buf->blind.relname);
- }
- else
- buf->flags &= ~BM_DIRTY;
- buf->cntxDirty = false;
- }
-
- /*
- * Somebody could have pinned the buffer while we were doing
- * the I/O and had given up the BufMgrLock (though they would
- * be waiting for us to clear the BM_IO_IN_PROGRESS flag).
- * That's why this is a loop -- if so, we need to clear the
- * I/O flags, remove our pin and start all over again.
- *
- * People may be making buffers free at any time, so there's no
- * reason to think that we have an immediate disaster on our
- * hands.
- */
- if (buf && buf->refcount > 1)
- {
- inProgress = FALSE;
- buf->flags &= ~BM_IO_IN_PROGRESS;
- TerminateBufferIO(buf);
- PrivateRefCount[BufferDescriptorGetBuffer(buf) - 1] = 0;
- buf->refcount--;
- buf = (BufferDesc *) NULL;
- }
-
- /*
- * Somebody could have allocated another buffer for the same
- * block we are about to read in. (While we flush out the
- * dirty buffer, we don't hold the lock and someone could have
- * allocated another buffer for the same block. The problem is
- * we haven't gotten around to insert the new tag into the
- * buffer table. So we need to check here. -ay 3/95
- */
- buf2 = BufTableLookup(&newTag);
- if (buf2 != NULL)
- {
-
- /*
- * Found it. Someone has already done what we're about to
- * do. We'll just handle this as if it were found in the
- * buffer pool in the first place.
- */
- if (buf != NULL)
- {
- buf->flags &= ~BM_IO_IN_PROGRESS;
- TerminateBufferIO(buf);
- /* give up the buffer since we don't need it any more */
- PrivateRefCount[BufferDescriptorGetBuffer(buf) - 1] = 0;
- Assert(buf->refcount > 0);
- buf->refcount--;
- if (buf->refcount == 0)
- {
- AddBufferToFreelist(buf);
- buf->flags |= BM_FREE;
- }
- }
-
- PinBuffer(buf2);
- inProgress = (buf2->flags & BM_IO_IN_PROGRESS);
-
- *foundPtr = TRUE;
- if (inProgress)
- {
- WaitIO(buf2, BufMgrLock);
- inProgress = (buf2->flags & BM_IO_IN_PROGRESS);
- }
- if (BUFFER_IS_BROKEN(buf2))
- *foundPtr = FALSE;
-
- if (!(*foundPtr))
- StartBufferIO(buf2, true);
- SpinRelease(BufMgrLock);
-
- return buf2;
- }
- }
- }
-
- /*
- * At this point we should have the sole pin on a non-dirty buffer and
- * we may or may not already have the BM_IO_IN_PROGRESS flag set.
- */
-
- /*
- * Change the name of the buffer in the lookup table:
- *
- * Need to update the lookup table before the read starts. If someone
- * comes along looking for the buffer while we are reading it in, we
- * don't want them to allocate a new buffer. For the same reason, we
- * didn't want to erase the buf table entry for the buffer we were
- * writing back until now, either.
- */
-
- if (!BufTableDelete(buf))
- {
- SpinRelease(BufMgrLock);
- elog(FATAL, "buffer wasn't in the buffer table\n");
- }
-
- /* record the database name and relation name for this buffer */
- strcpy(buf->blind.dbname, (DatabaseName) ? DatabaseName : "Recovery");
- strcpy(buf->blind.relname, RelationGetPhysicalRelationName(reln));
-
- INIT_BUFFERTAG(&(buf->tag), reln, blockNum);
- if (!BufTableInsert(buf))
- {
- SpinRelease(BufMgrLock);
- elog(FATAL, "Buffer in lookup table twice \n");
- }
-
- /*
- * Buffer contents are currently invalid. Have to mark IO IN PROGRESS
- * so no one fiddles with them until the read completes. If this
- * routine has been called simply to allocate a buffer, no io will be
- * attempted, so the flag isnt set.
- */
- if (!inProgress)
- StartBufferIO(buf, true);
- else
- ContinueBufferIO(buf, true);
-
-#ifdef BMTRACE
- _bm_trace((reln->rd_rel->relisshared ? 0 : MyDatabaseId), RelationGetRelid(reln), blockNum, BufferDescriptorGetBuffer(buf), BMT_ALLOCNOTFND);
-#endif /* BMTRACE */
-
- SpinRelease(BufMgrLock);
-
- return buf;
-}
-
-/*
- * WriteBuffer
- *
- * Marks buffer contents as dirty (actual write happens later).
- *
- * Assume that buffer is pinned. Assume that reln is
- * valid.
- *
- * Side Effects:
- * Pin count is decremented.
- */
-
-#undef WriteBuffer
-
-int
-WriteBuffer(Buffer buffer)
-{
- BufferDesc *bufHdr;
-
- if (BufferIsLocal(buffer))
- return WriteLocalBuffer(buffer, TRUE);
-
- if (BAD_BUFFER_ID(buffer))
- return FALSE;
-
- bufHdr = &BufferDescriptors[buffer - 1];
-
- SharedBufferChanged = true;
-
- SpinAcquire(BufMgrLock);
- Assert(bufHdr->refcount > 0);
-
- bufHdr->flags |= (BM_DIRTY | BM_JUST_DIRTIED);
-
- UnpinBuffer(bufHdr);
- SpinRelease(BufMgrLock);
-
- return TRUE;
-}
-
-/*
- * WriteNoReleaseBuffer -- like WriteBuffer, but do not unpin the buffer
- * when the operation is complete.
- */
-int
-WriteNoReleaseBuffer(Buffer buffer)
-{
- BufferDesc *bufHdr;
-
- if (BufferIsLocal(buffer))
- return WriteLocalBuffer(buffer, FALSE);
-
- if (BAD_BUFFER_ID(buffer))
- return STATUS_ERROR;
-
- bufHdr = &BufferDescriptors[buffer - 1];
-
- SharedBufferChanged = true;
-
- SpinAcquire(BufMgrLock);
- Assert(bufHdr->refcount > 0);
-
- bufHdr->flags |= (BM_DIRTY | BM_JUST_DIRTIED);
-
- SpinRelease(BufMgrLock);
-
- return STATUS_OK;
-}
-
-
-#undef ReleaseAndReadBuffer
-/*
- * ReleaseAndReadBuffer -- combine ReleaseBuffer() and ReadBuffer()
- * so that only one semop needs to be called.
- *
- */
-Buffer
-ReleaseAndReadBuffer(Buffer buffer,
- Relation relation,
- BlockNumber blockNum)
-{
- BufferDesc *bufHdr;
- Buffer retbuf;
-
- if (BufferIsLocal(buffer))
- {
- Assert(LocalRefCount[-buffer - 1] > 0);
- LocalRefCount[-buffer - 1]--;
- }
- else
- {
- if (BufferIsValid(buffer))
- {
- bufHdr = &BufferDescriptors[buffer - 1];
- Assert(PrivateRefCount[buffer - 1] > 0);
- PrivateRefCount[buffer - 1]--;
- if (PrivateRefCount[buffer - 1] == 0)
- {
- SpinAcquire(BufMgrLock);
- Assert(bufHdr->refcount > 0);
- bufHdr->refcount--;
- if (bufHdr->refcount == 0)
- {
- AddBufferToFreelist(bufHdr);
- bufHdr->flags |= BM_FREE;
- }
- retbuf = ReadBufferWithBufferLock(relation, blockNum, true);
- return retbuf;
- }
- }
- }
-
- return ReadBuffer(relation, blockNum);
-}
-
-/*
- * BufferSync -- Write all dirty buffers in the pool.
- *
- * This is called at checkpoint time and write out all dirty buffers.
- */
-void
-BufferSync()
-{
- int i;
- BufferDesc *bufHdr;
- Buffer buffer;
- int status;
- RelFileNode rnode;
- XLogRecPtr recptr;
- Relation reln = NULL;
-
- for (i = 0, bufHdr = BufferDescriptors; i < NBuffers; i++, bufHdr++)
- {
-
- SpinAcquire(BufMgrLock);
-
- if (!(bufHdr->flags & BM_VALID))
- {
- SpinRelease(BufMgrLock);
- continue;
- }
-
- /*
- * Pin buffer and ensure that no one reads it from disk
- */
- PinBuffer(bufHdr);
- /* Synchronize with BufferAlloc */
- if (bufHdr->flags & BM_IO_IN_PROGRESS)
- WaitIO(bufHdr, BufMgrLock);
-
- buffer = BufferDescriptorGetBuffer(bufHdr);
- rnode = bufHdr->tag.rnode;
-
- SpinRelease(BufMgrLock);
-
- /*
- * Try to find relation for buffer
- */
- reln = RelationNodeCacheGetRelation(rnode);
-
- /*
- * Protect buffer content against concurrent update
- */
- LockBuffer(buffer, BUFFER_LOCK_SHARE);
-
- /*
- * Force XLOG flush for buffer' LSN
- */
- recptr = BufferGetLSN(bufHdr);
- XLogFlush(recptr);
-
- /*
- * Now it's safe to write buffer to disk
- * (if needed at all -:))
- */
-
- SpinAcquire(BufMgrLock);
- if (bufHdr->flags & BM_IO_IN_PROGRESS)
- WaitIO(bufHdr, BufMgrLock);
-
- if (bufHdr->flags & BM_DIRTY || bufHdr->cntxDirty)
- {
- bufHdr->flags &= ~BM_JUST_DIRTIED;
- StartBufferIO(bufHdr, false); /* output IO start */
-
- SpinRelease(BufMgrLock);
-
- if (reln == (Relation) NULL)
- {
- status = smgrblindwrt(DEFAULT_SMGR,
- bufHdr->tag.rnode,
- bufHdr->tag.blockNum,
- (char *) MAKE_PTR(bufHdr->data),
- true); /* must fsync */
- }
- else
- {
- status = smgrwrite(DEFAULT_SMGR, reln,
- bufHdr->tag.blockNum,
- (char *) MAKE_PTR(bufHdr->data));
- }
-
- if (status == SM_FAIL) /* disk failure ?! */
- elog(STOP, "BufferSync: cannot write %u for %s",
- bufHdr->tag.blockNum, bufHdr->blind.relname);
-
- /*
- * Note that it's safe to change cntxDirty here because of
- * we protect it from upper writers by share lock and from
- * other bufmgr routines by BM_IO_IN_PROGRESS
- */
- bufHdr->cntxDirty = false;
-
- /*
- * Release the per-buffer readlock, reacquire BufMgrLock.
- */
- LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
- BufferFlushCount++;
-
- SpinAcquire(BufMgrLock);
-
- bufHdr->flags &= ~BM_IO_IN_PROGRESS; /* mark IO finished */
- TerminateBufferIO(bufHdr); /* Sync IO finished */
-
- /*
- * If this buffer was marked by someone as DIRTY while
- * we were flushing it out we must not clear DIRTY
- * flag - vadim 01/17/97
- */
- if (!(bufHdr->flags & BM_JUST_DIRTIED))
- bufHdr->flags &= ~BM_DIRTY;
- }
- else
- LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
-
- UnpinBuffer(bufHdr);
-
- SpinRelease(BufMgrLock);
-
- /* drop refcnt obtained by RelationNodeCacheGetRelation */
- if (reln != (Relation) NULL)
- {
- RelationDecrementReferenceCount(reln);
- reln = NULL;
- }
- }
-
-}
-
-/*
- * WaitIO -- Block until the IO_IN_PROGRESS flag on 'buf' is cleared.
- *
- * Should be entered with buffer manager spinlock held; releases it before
- * waiting and re-acquires it afterwards.
- */
-static void
-WaitIO(BufferDesc *buf, SPINLOCK spinlock)
-{
-
- /*
- * Changed to wait until there's no IO - Inoue 01/13/2000
- */
- while ((buf->flags & BM_IO_IN_PROGRESS) != 0)
- {
- SpinRelease(spinlock);
- S_LOCK(&(buf->io_in_progress_lock));
- S_UNLOCK(&(buf->io_in_progress_lock));
- SpinAcquire(spinlock);
- }
-}
-
-
-long NDirectFileRead; /* some I/O's are direct file access.
- * bypass bufmgr */
-long NDirectFileWrite; /* e.g., I/O in psort and hashjoin. */
-
-void
-PrintBufferUsage(FILE *statfp)
-{
- float hitrate;
- float localhitrate;
-
- if (ReadBufferCount == 0)
- hitrate = 0.0;
- else
- hitrate = (float) BufferHitCount *100.0 / ReadBufferCount;
-
- if (ReadLocalBufferCount == 0)
- localhitrate = 0.0;
- else
- localhitrate = (float) LocalBufferHitCount *100.0 / ReadLocalBufferCount;
-
- fprintf(statfp, "!\tShared blocks: %10ld read, %10ld written, buffer hit rate = %.2f%%\n",
- ReadBufferCount - BufferHitCount, BufferFlushCount, hitrate);
- fprintf(statfp, "!\tLocal blocks: %10ld read, %10ld written, buffer hit rate = %.2f%%\n",
- ReadLocalBufferCount - LocalBufferHitCount, LocalBufferFlushCount, localhitrate);
- fprintf(statfp, "!\tDirect blocks: %10ld read, %10ld written\n",
- NDirectFileRead, NDirectFileWrite);
-}
-
-void
-ResetBufferUsage()
-{
- BufferHitCount = 0;
- ReadBufferCount = 0;
- BufferFlushCount = 0;
- LocalBufferHitCount = 0;
- ReadLocalBufferCount = 0;
- LocalBufferFlushCount = 0;
- NDirectFileRead = 0;
- NDirectFileWrite = 0;
-}
-
-/* ----------------------------------------------
- * ResetBufferPool
- *
- * This routine is supposed to be called when a transaction aborts.
- * it will release all the buffer pins held by the transaction.
- * Currently, we also call it during commit if BufferPoolCheckLeak
- * detected a problem --- in that case, isCommit is TRUE, and we
- * only clean up buffer pin counts.
- *
- * During abort, we also forget any pending fsync requests. Dirtied buffers
- * will still get written, eventually, but there will be no fsync for them.
- *
- * ----------------------------------------------
- */
-void
-ResetBufferPool(bool isCommit)
-{
- int i;
-
- for (i = 0; i < NBuffers; i++)
- {
- if (PrivateRefCount[i] != 0)
- {
- BufferDesc *buf = &BufferDescriptors[i];
-
- SpinAcquire(BufMgrLock);
- Assert(buf->refcount > 0);
- buf->refcount--;
- if (buf->refcount == 0)
- {
- AddBufferToFreelist(buf);
- buf->flags |= BM_FREE;
- }
- SpinRelease(BufMgrLock);
- }
- PrivateRefCount[i] = 0;
- }
-
- ResetLocalBufferPool();
-
- if (!isCommit)
- smgrabort();
-}
-
-/* -----------------------------------------------
- * BufferPoolCheckLeak
- *
- * check if there is buffer leak
- *
- * -----------------------------------------------
- */
-int
-BufferPoolCheckLeak()
-{
- int i;
- int result = 0;
-
- for (i = 1; i <= NBuffers; i++)
- {
- if (PrivateRefCount[i - 1] != 0)
- {
- BufferDesc *buf = &(BufferDescriptors[i - 1]);
-
- elog(NOTICE,
- "Buffer Leak: [%03d] (freeNext=%ld, freePrev=%ld, \
-relname=%s, blockNum=%d, flags=0x%x, refcount=%d %ld)",
- i - 1, buf->freeNext, buf->freePrev,
- buf->blind.relname, buf->tag.blockNum, buf->flags,
- buf->refcount, PrivateRefCount[i - 1]);
- result = 1;
- }
- }
- return result;
-}
-
-/* ------------------------------------------------
- * FlushBufferPool
- *
- * Flush all dirty blocks in buffer pool to disk
- * at the checkpoint time
- * ------------------------------------------------
- */
-void
-FlushBufferPool(void)
-{
- BufferSync();
- smgrsync();
-}
-
-/*
- * At the commit time we have to flush local buffer pool only
- */
-void
-BufmgrCommit(void)
-{
- LocalBufferSync();
- /*
- * All files created in current transaction will be fsync-ed
- */
- smgrcommit();
-}
-
-/*
- * BufferGetBlockNumber
- * Returns the block number associated with a buffer.
- *
- * Note:
- * Assumes that the buffer is valid.
- */
-BlockNumber
-BufferGetBlockNumber(Buffer buffer)
-{
- Assert(BufferIsValid(buffer));
-
- /* XXX should be a critical section */
- if (BufferIsLocal(buffer))
- return LocalBufferDescriptors[-buffer - 1].tag.blockNum;
- else
- return BufferDescriptors[buffer - 1].tag.blockNum;
-}
-
-/*
- * BufferReplace
- *
- * Write out the buffer corresponding to 'bufHdr'
- *
- * BufMgrLock must be held at entry, and the buffer must be pinned.
- */
-static int
-BufferReplace(BufferDesc *bufHdr)
-{
- Relation reln;
- XLogRecPtr recptr;
- int status;
-
- /* To check if block content changed while flushing. - vadim 01/17/97 */
- bufHdr->flags &= ~BM_JUST_DIRTIED;
-
- SpinRelease(BufMgrLock);
-
- /*
- * No need to lock buffer context - no one should be able to
- * end ReadBuffer
- */
- recptr = BufferGetLSN(bufHdr);
- XLogFlush(recptr);
-
- reln = RelationNodeCacheGetRelation(bufHdr->tag.rnode);
-
- if (reln != (Relation) NULL)
- {
- status = smgrwrite(DEFAULT_SMGR, reln, bufHdr->tag.blockNum,
- (char *) MAKE_PTR(bufHdr->data));
- }
- else
- {
- status = smgrblindwrt(DEFAULT_SMGR, bufHdr->tag.rnode,
- bufHdr->tag.blockNum,
- (char *) MAKE_PTR(bufHdr->data),
- false); /* no fsync */
- }
-
- /* drop relcache refcnt incremented by RelationNodeCacheGetRelation */
- if (reln != (Relation) NULL)
- RelationDecrementReferenceCount(reln);
-
- SpinAcquire(BufMgrLock);
-
- if (status == SM_FAIL)
- return FALSE;
-
- BufferFlushCount++;
-
- return TRUE;
-}
-
-/*
- * RelationGetNumberOfBlocks
- * Returns the buffer descriptor associated with a page in a relation.
- *
- * Note:
- * XXX may fail for huge relations.
- * XXX should be elsewhere.
- * XXX maybe should be hidden
- */
-BlockNumber
-RelationGetNumberOfBlocks(Relation relation)
-{
- return ((relation->rd_myxactonly) ? relation->rd_nblocks :
- ((relation->rd_rel->relkind == RELKIND_VIEW) ? 0 :
- smgrnblocks(DEFAULT_SMGR, relation)));
-}
-
-/* ---------------------------------------------------------------------
- * DropRelationBuffers
- *
- * This function removes all the buffered pages for a relation
- * from the buffer pool. Dirty pages are simply dropped, without
- * bothering to write them out first. This is NOT rollback-able,
- * and so should be used only with extreme caution!
- *
- * We assume that the caller holds an exclusive lock on the relation,
- * which should assure that no new buffers will be acquired for the rel
- * meanwhile.
- *
- * XXX currently it sequentially searches the buffer pool, should be
- * changed to more clever ways of searching.
- * --------------------------------------------------------------------
- */
-void
-DropRelationBuffers(Relation rel)
-{
- int i;
- BufferDesc *bufHdr;
-
- if (rel->rd_myxactonly)
- {
- for (i = 0; i < NLocBuffer; i++)
- {
- bufHdr = &LocalBufferDescriptors[i];
- if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
- {
- bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
- bufHdr->cntxDirty = false;
- LocalRefCount[i] = 0;
- bufHdr->tag.rnode.relNode = InvalidOid;
- }
- }
- return;
- }
-
- SpinAcquire(BufMgrLock);
- for (i = 1; i <= NBuffers; i++)
- {
- bufHdr = &BufferDescriptors[i - 1];
-recheck:
- if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
- {
-
- /*
- * If there is I/O in progress, better wait till it's done;
- * don't want to delete the relation out from under someone
- * who's just trying to flush the buffer!
- */
- if (bufHdr->flags & BM_IO_IN_PROGRESS)
- {
- WaitIO(bufHdr, BufMgrLock);
-
- /*
- * By now, the buffer very possibly belongs to some other
- * rel, so check again before proceeding.
- */
- goto recheck;
- }
- /* Now we can do what we came for */
- bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
- bufHdr->cntxDirty = false;
-
- /*
- * Release any refcount we may have.
- *
- * This is very probably dead code, and if it isn't then it's
- * probably wrong. I added the Assert to find out --- tgl
- * 11/99.
- */
- if (!(bufHdr->flags & BM_FREE))
- {
- /* Assert checks that buffer will actually get freed! */
- Assert(PrivateRefCount[i - 1] == 1 &&
- bufHdr->refcount == 1);
- /* ReleaseBuffer expects we do not hold the lock at entry */
- SpinRelease(BufMgrLock);
- ReleaseBuffer(i);
- SpinAcquire(BufMgrLock);
- }
- /*
- * And mark the buffer as no longer occupied by this rel.
- */
- BufTableDelete(bufHdr);
- }
- }
-
- SpinRelease(BufMgrLock);
-}
-
-/* ---------------------------------------------------------------------
- * DropRelFileNodeBuffers
- *
- * This is the same as DropRelationBuffers, except that the target
- * relation is specified by RelFileNode.
- *
- * This is NOT rollback-able. One legitimate use is to clear the
- * buffer cache of buffers for a relation that is being deleted
- * during transaction abort.
- * --------------------------------------------------------------------
- */
-void
-DropRelFileNodeBuffers(RelFileNode rnode)
-{
- int i;
- BufferDesc *bufHdr;
-
- /* We have to search both local and shared buffers... */
-
- for (i = 0; i < NLocBuffer; i++)
- {
- bufHdr = &LocalBufferDescriptors[i];
- if (RelFileNodeEquals(bufHdr->tag.rnode, rnode))
- {
- bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
- bufHdr->cntxDirty = false;
- LocalRefCount[i] = 0;
- bufHdr->tag.rnode.relNode = InvalidOid;
- }
- }
-
- SpinAcquire(BufMgrLock);
- for (i = 1; i <= NBuffers; i++)
- {
- bufHdr = &BufferDescriptors[i - 1];
-recheck:
- if (RelFileNodeEquals(bufHdr->tag.rnode, rnode))
- {
-
- /*
- * If there is I/O in progress, better wait till it's done;
- * don't want to delete the relation out from under someone
- * who's just trying to flush the buffer!
- */
- if (bufHdr->flags & BM_IO_IN_PROGRESS)
- {
- WaitIO(bufHdr, BufMgrLock);
-
- /*
- * By now, the buffer very possibly belongs to some other
- * rel, so check again before proceeding.
- */
- goto recheck;
- }
- /* Now we can do what we came for */
- bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
- bufHdr->cntxDirty = false;
-
- /*
- * Release any refcount we may have.
- *
- * This is very probably dead code, and if it isn't then it's
- * probably wrong. I added the Assert to find out --- tgl
- * 11/99.
- */
- if (!(bufHdr->flags & BM_FREE))
- {
- /* Assert checks that buffer will actually get freed! */
- Assert(PrivateRefCount[i - 1] == 1 &&
- bufHdr->refcount == 1);
- /* ReleaseBuffer expects we do not hold the lock at entry */
- SpinRelease(BufMgrLock);
- ReleaseBuffer(i);
- SpinAcquire(BufMgrLock);
- }
- /*
- * And mark the buffer as no longer occupied by this rel.
- */
- BufTableDelete(bufHdr);
- }
- }
-
- SpinRelease(BufMgrLock);
-}
-
-/* ---------------------------------------------------------------------
- * DropBuffers
- *
- * This function removes all the buffers in the buffer cache for a
- * particular database. Dirty pages are simply dropped, without
- * bothering to write them out first. This is used when we destroy a
- * database, to avoid trying to flush data to disk when the directory
- * tree no longer exists. Implementation is pretty similar to
- * DropRelationBuffers() which is for destroying just one relation.
- * --------------------------------------------------------------------
- */
-void
-DropBuffers(Oid dbid)
-{
- int i;
- BufferDesc *bufHdr;
-
- SpinAcquire(BufMgrLock);
- for (i = 1; i <= NBuffers; i++)
- {
- bufHdr = &BufferDescriptors[i - 1];
-recheck:
- /*
- * We know that currently database OID is tblNode but
- * this probably will be changed in future and this
- * func will be used to drop tablespace buffers.
- */
- if (bufHdr->tag.rnode.tblNode == dbid)
- {
-
- /*
- * If there is I/O in progress, better wait till it's done;
- * don't want to delete the database out from under someone
- * who's just trying to flush the buffer!
- */
- if (bufHdr->flags & BM_IO_IN_PROGRESS)
- {
- WaitIO(bufHdr, BufMgrLock);
-
- /*
- * By now, the buffer very possibly belongs to some other
- * DB, so check again before proceeding.
- */
- goto recheck;
- }
- /* Now we can do what we came for */
- bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
- bufHdr->cntxDirty = false;
-
- /*
- * The thing should be free, if caller has checked that no
- * backends are running in that database.
- */
- Assert(bufHdr->flags & BM_FREE);
- /*
- * And mark the buffer as no longer occupied by this page.
- */
- BufTableDelete(bufHdr);
- }
- }
- SpinRelease(BufMgrLock);
-}
-
-/* -----------------------------------------------------------------
- * PrintBufferDescs
- *
- * this function prints all the buffer descriptors, for debugging
- * use only.
- * -----------------------------------------------------------------
- */
-void
-PrintBufferDescs()
-{
- int i;
- BufferDesc *buf = BufferDescriptors;
-
- if (IsUnderPostmaster)
- {
- SpinAcquire(BufMgrLock);
- for (i = 0; i < NBuffers; ++i, ++buf)
- {
- elog(DEBUG, "[%02d] (freeNext=%ld, freePrev=%ld, relname=%s, \
-blockNum=%d, flags=0x%x, refcount=%d %ld)",
- i, buf->freeNext, buf->freePrev,
- buf->blind.relname, buf->tag.blockNum, buf->flags,
- buf->refcount, PrivateRefCount[i]);
- }
- SpinRelease(BufMgrLock);
- }
- else
- {
- /* interactive backend */
- for (i = 0; i < NBuffers; ++i, ++buf)
- {
- printf("[%-2d] (%s, %d) flags=0x%x, refcnt=%d %ld)\n",
- i, buf->blind.relname, buf->tag.blockNum,
- buf->flags, buf->refcount, PrivateRefCount[i]);
- }
- }
-}
-
-void
-PrintPinnedBufs()
-{
- int i;
- BufferDesc *buf = BufferDescriptors;
-
- SpinAcquire(BufMgrLock);
- for (i = 0; i < NBuffers; ++i, ++buf)
- {
- if (PrivateRefCount[i] > 0)
- elog(NOTICE, "[%02d] (freeNext=%ld, freePrev=%ld, relname=%s, \
-blockNum=%d, flags=0x%x, refcount=%d %ld)\n",
- i, buf->freeNext, buf->freePrev, buf->blind.relname,
- buf->tag.blockNum, buf->flags,
- buf->refcount, PrivateRefCount[i]);
- }
- SpinRelease(BufMgrLock);
-}
-
-/*
- * BufferPoolBlowaway
- *
- * this routine is solely for the purpose of experiments -- sometimes
- * you may want to blowaway whatever is left from the past in buffer
- * pool and start measuring some performance with a clean empty buffer
- * pool.
- */
-#ifdef NOT_USED
-void
-BufferPoolBlowaway()
-{
- int i;
-
- BufferSync();
- for (i = 1; i <= NBuffers; i++)
- {
- if (BufferIsValid(i))
- {
- while (BufferIsValid(i))
- ReleaseBuffer(i);
- }
- BufTableDelete(&BufferDescriptors[i - 1]);
- }
-}
-
-#endif
-
-/* ---------------------------------------------------------------------
- * FlushRelationBuffers
- *
- * This function writes all dirty pages of a relation out to disk.
- * Furthermore, pages that have blocknumber >= firstDelBlock are
- * actually removed from the buffer pool. An error code is returned
- * if we fail to dump a dirty buffer or if we find one of
- * the target pages is pinned into the cache.
- *
- * This is called by DROP TABLE to clear buffers for the relation
- * from the buffer pool. Note that we must write dirty buffers,
- * rather than just dropping the changes, because our transaction
- * might abort later on; we want to roll back safely in that case.
- *
- * This is also called by VACUUM before truncating the relation to the
- * given number of blocks. It might seem unnecessary for VACUUM to
- * write dirty pages before firstDelBlock, since VACUUM should already
- * have committed its changes. However, it is possible for there still
- * to be dirty pages: if some page had unwritten on-row tuple status
- * updates from a prior transaction, and VACUUM had no additional
- * changes to make to that page, then VACUUM won't have written it.
- * This is harmless in most cases but will break pg_upgrade, which
- * relies on VACUUM to ensure that *all* tuples have correct on-row
- * status. So, we check and flush all dirty pages of the rel
- * regardless of block number.
- *
- * In all cases, the caller should be holding AccessExclusiveLock on
- * the target relation to ensure that no other backend is busy reading
- * more blocks of the relation (or might do so before we commit).
- *
- * Formerly, we considered it an error condition if we found dirty
- * buffers here. However, since BufferSync no longer forces out all
- * dirty buffers at every xact commit, it's possible for dirty buffers
- * to still be present in the cache due to failure of an earlier
- * transaction. So, must flush dirty buffers without complaint.
- *
- * Returns: 0 - Ok, -1 - FAILED TO WRITE DIRTY BUFFER, -2 - PINNED
- *
- * XXX currently it sequentially searches the buffer pool, should be
- * changed to more clever ways of searching.
- * --------------------------------------------------------------------
- */
-int
-FlushRelationBuffers(Relation rel, BlockNumber firstDelBlock)
-{
- int i;
- BufferDesc *bufHdr;
- XLogRecPtr recptr;
- int status;
-
- if (rel->rd_myxactonly)
- {
- for (i = 0; i < NLocBuffer; i++)
- {
- bufHdr = &LocalBufferDescriptors[i];
- if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
- {
- if (bufHdr->flags & BM_DIRTY || bufHdr->cntxDirty)
- {
- status = smgrwrite(DEFAULT_SMGR, rel,
- bufHdr->tag.blockNum,
- (char *) MAKE_PTR(bufHdr->data));
- if (status == SM_FAIL)
- {
- elog(NOTICE, "FlushRelationBuffers(%s (local), %u): block %u is dirty, could not flush it",
- RelationGetRelationName(rel), firstDelBlock,
- bufHdr->tag.blockNum);
- return(-1);
- }
- bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
- bufHdr->cntxDirty = false;
- }
- if (LocalRefCount[i] > 0)
- {
- elog(NOTICE, "FlushRelationBuffers(%s (local), %u): block %u is referenced (%ld)",
- RelationGetRelationName(rel), firstDelBlock,
- bufHdr->tag.blockNum, LocalRefCount[i]);
- return(-2);
- }
- if (bufHdr->tag.blockNum >= firstDelBlock)
- {
- bufHdr->tag.rnode.relNode = InvalidOid;
- }
- }
- }
- return 0;
- }
-
- SpinAcquire(BufMgrLock);
- for (i = 0; i < NBuffers; i++)
- {
- bufHdr = &BufferDescriptors[i];
- if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
- {
- if (bufHdr->flags & BM_DIRTY || bufHdr->cntxDirty)
- {
- PinBuffer(bufHdr);
- if (bufHdr->flags & BM_IO_IN_PROGRESS)
- WaitIO(bufHdr, BufMgrLock);
- SpinRelease(BufMgrLock);
-
- /*
- * Force XLOG flush for buffer' LSN
- */
- recptr = BufferGetLSN(bufHdr);
- XLogFlush(recptr);
-
- /*
- * Now it's safe to write buffer to disk
- */
-
- SpinAcquire(BufMgrLock);
- if (bufHdr->flags & BM_IO_IN_PROGRESS)
- WaitIO(bufHdr, BufMgrLock);
-
- if (bufHdr->flags & BM_DIRTY || bufHdr->cntxDirty)
- {
- bufHdr->flags &= ~BM_JUST_DIRTIED;
- StartBufferIO(bufHdr, false); /* output IO start */
-
- SpinRelease(BufMgrLock);
-
- status = smgrwrite(DEFAULT_SMGR, rel,
- bufHdr->tag.blockNum,
- (char *) MAKE_PTR(bufHdr->data));
-
- if (status == SM_FAIL) /* disk failure ?! */
- elog(STOP, "FlushRelationBuffers: cannot write %u for %s",
- bufHdr->tag.blockNum, bufHdr->blind.relname);
-
- BufferFlushCount++;
-
- SpinAcquire(BufMgrLock);
- bufHdr->flags &= ~BM_IO_IN_PROGRESS;
- TerminateBufferIO(bufHdr);
- Assert(!(bufHdr->flags & BM_JUST_DIRTIED));
- bufHdr->flags &= ~BM_DIRTY;
- /*
- * Note that it's safe to change cntxDirty here because
- * of we protect it from upper writers by
- * AccessExclusiveLock and from other bufmgr routines
- * by BM_IO_IN_PROGRESS
- */
- bufHdr->cntxDirty = false;
- }
- UnpinBuffer(bufHdr);
- }
- if (!(bufHdr->flags & BM_FREE))
- {
- SpinRelease(BufMgrLock);
- elog(NOTICE, "FlushRelationBuffers(%s, %u): block %u is referenced (private %ld, global %d)",
- RelationGetRelationName(rel), firstDelBlock,
- bufHdr->tag.blockNum,
- PrivateRefCount[i], bufHdr->refcount);
- return -2;
- }
- if (bufHdr->tag.blockNum >= firstDelBlock)
- {
- BufTableDelete(bufHdr);
- }
- }
- }
- SpinRelease(BufMgrLock);
- return 0;
-}
-
-#undef ReleaseBuffer
-
-/*
- * ReleaseBuffer -- remove the pin on a buffer without
- * marking it dirty.
- *
- */
-int
-ReleaseBuffer(Buffer buffer)
-{
- BufferDesc *bufHdr;
-
- if (BufferIsLocal(buffer))
- {
- Assert(LocalRefCount[-buffer - 1] > 0);
- LocalRefCount[-buffer - 1]--;
- return STATUS_OK;
- }
-
- if (BAD_BUFFER_ID(buffer))
- return STATUS_ERROR;
-
- bufHdr = &BufferDescriptors[buffer - 1];
-
- Assert(PrivateRefCount[buffer - 1] > 0);
- PrivateRefCount[buffer - 1]--;
- if (PrivateRefCount[buffer - 1] == 0)
- {
- SpinAcquire(BufMgrLock);
- Assert(bufHdr->refcount > 0);
- bufHdr->refcount--;
- if (bufHdr->refcount == 0)
- {
- AddBufferToFreelist(bufHdr);
- bufHdr->flags |= BM_FREE;
- }
- SpinRelease(BufMgrLock);
- }
-
- return STATUS_OK;
-}
-
-#ifdef NOT_USED
-void
-IncrBufferRefCount_Debug(char *file, int line, Buffer buffer)
-{
- IncrBufferRefCount(buffer);
- if (ShowPinTrace && !BufferIsLocal(buffer) && is_userbuffer(buffer))
- {
- BufferDesc *buf = &BufferDescriptors[buffer - 1];
-
- fprintf(stderr, "PIN(Incr) %ld relname = %s, blockNum = %d, \
-refcount = %ld, file: %s, line: %d\n",
- buffer, buf->blind.relname, buf->tag.blockNum,
- PrivateRefCount[buffer - 1], file, line);
- }
-}
-
-#endif
-
-#ifdef NOT_USED
-void
-ReleaseBuffer_Debug(char *file, int line, Buffer buffer)
-{
- ReleaseBuffer(buffer);
- if (ShowPinTrace && !BufferIsLocal(buffer) && is_userbuffer(buffer))
- {
- BufferDesc *buf = &BufferDescriptors[buffer - 1];
-
- fprintf(stderr, "UNPIN(Rel) %ld relname = %s, blockNum = %d, \
-refcount = %ld, file: %s, line: %d\n",
- buffer, buf->blind.relname, buf->tag.blockNum,
- PrivateRefCount[buffer - 1], file, line);
- }
-}
-
-#endif
-
-#ifdef NOT_USED
-int
-ReleaseAndReadBuffer_Debug(char *file,
- int line,
- Buffer buffer,
- Relation relation,
- BlockNumber blockNum)
-{
- bool bufferValid;
- Buffer b;
-
- bufferValid = BufferIsValid(buffer);
- b = ReleaseAndReadBuffer(buffer, relation, blockNum);
- if (ShowPinTrace && bufferValid && BufferIsLocal(buffer)
- && is_userbuffer(buffer))
- {
- BufferDesc *buf = &BufferDescriptors[buffer - 1];
-
- fprintf(stderr, "UNPIN(Rel&Rd) %ld relname = %s, blockNum = %d, \
-refcount = %ld, file: %s, line: %d\n",
- buffer, buf->blind.relname, buf->tag.blockNum,
- PrivateRefCount[buffer - 1], file, line);
- }
- if (ShowPinTrace && BufferIsLocal(buffer) && is_userbuffer(buffer))
- {
- BufferDesc *buf = &BufferDescriptors[b - 1];
-
- fprintf(stderr, "PIN(Rel&Rd) %ld relname = %s, blockNum = %d, \
-refcount = %ld, file: %s, line: %d\n",
- b, buf->blind.relname, buf->tag.blockNum,
- PrivateRefCount[b - 1], file, line);
- }
- return b;
-}
-
-#endif
-
-#ifdef BMTRACE
-
-/*
- * trace allocations and deallocations in a circular buffer in
- * shared memory. check the buffer before doing the allocation,
- * and die if there's anything fishy.
- */
-
-_bm_trace(Oid dbId, Oid relId, int blkNo, int bufNo, int allocType)
-{
- long start,
- cur;
- bmtrace *tb;
-
- start = *CurTraceBuf;
-
- if (start > 0)
- cur = start - 1;
- else
- cur = BMT_LIMIT - 1;
-
- for (;;)
- {
- tb = &TraceBuf[cur];
- if (tb->bmt_op != BMT_NOTUSED)
- {
- if (tb->bmt_buf == bufNo)
- {
- if ((tb->bmt_op == BMT_DEALLOC)
- || (tb->bmt_dbid == dbId && tb->bmt_relid == relId
- && tb->bmt_blkno == blkNo))
- goto okay;
-
- /* die holding the buffer lock */
- _bm_die(dbId, relId, blkNo, bufNo, allocType, start, cur);
- }
- }
-
- if (cur == start)
- goto okay;
-
- if (cur == 0)
- cur = BMT_LIMIT - 1;
- else
- cur--;
- }
-
-okay:
- tb = &TraceBuf[start];
- tb->bmt_pid = MyProcPid;
- tb->bmt_buf = bufNo;
- tb->bmt_dbid = dbId;
- tb->bmt_relid = relId;
- tb->bmt_blkno = blkNo;
- tb->bmt_op = allocType;
-
- *CurTraceBuf = (start + 1) % BMT_LIMIT;
-}
-
-_bm_die(Oid dbId, Oid relId, int blkNo, int bufNo,
- int allocType, long start, long cur)
-{
- FILE *fp;
- bmtrace *tb;
- int i;
-
- tb = &TraceBuf[cur];
-
- if ((fp = AllocateFile("/tmp/death_notice", "w")) == NULL)
- elog(FATAL, "buffer alloc trace error and can't open log file");
-
- fprintf(fp, "buffer alloc trace detected the following error:\n\n");
- fprintf(fp, " buffer %d being %s inconsistently with a previous %s\n\n",
- bufNo, (allocType == BMT_DEALLOC ? "deallocated" : "allocated"),
- (tb->bmt_op == BMT_DEALLOC ? "deallocation" : "allocation"));
-
- fprintf(fp, "the trace buffer contains:\n");
-
- i = start;
- for (;;)
- {
- tb = &TraceBuf[i];
- if (tb->bmt_op != BMT_NOTUSED)
- {
- fprintf(fp, " [%3d]%spid %d buf %2d for <%d,%u,%d> ",
- i, (i == cur ? " ---> " : "\t"),
- tb->bmt_pid, tb->bmt_buf,
- tb->bmt_dbid, tb->bmt_relid, tb->bmt_blkno);
-
- switch (tb->bmt_op)
- {
- case BMT_ALLOCFND:
- fprintf(fp, "allocate (found)\n");
- break;
-
- case BMT_ALLOCNOTFND:
- fprintf(fp, "allocate (not found)\n");
- break;
-
- case BMT_DEALLOC:
- fprintf(fp, "deallocate\n");
- break;
-
- default:
- fprintf(fp, "unknown op type %d\n", tb->bmt_op);
- break;
- }
- }
-
- i = (i + 1) % BMT_LIMIT;
- if (i == start)
- break;
- }
-
- fprintf(fp, "\noperation causing error:\n");
- fprintf(fp, "\tpid %d buf %d for <%d,%u,%d> ",
- getpid(), bufNo, dbId, relId, blkNo);
-
- switch (allocType)
- {
- case BMT_ALLOCFND:
- fprintf(fp, "allocate (found)\n");
- break;
-
- case BMT_ALLOCNOTFND:
- fprintf(fp, "allocate (not found)\n");
- break;
-
- case BMT_DEALLOC:
- fprintf(fp, "deallocate\n");
- break;
-
- default:
- fprintf(fp, "unknown op type %d\n", allocType);
- break;
- }
-
- FreeFile(fp);
-
- kill(getpid(), SIGILL);
-}
-
-#endif /* BMTRACE */
-
-/*
- * SetBufferCommitInfoNeedsSave
- *
- * Mark a buffer dirty when we have updated tuple commit-status bits in it.
- *
- * This is similar to WriteNoReleaseBuffer, except that we do not set
- * SharedBufferChanged or BufferDirtiedByMe, because we have not made a
- * critical change that has to be flushed to disk before xact commit --- the
- * status-bit update could be redone by someone else just as easily. The
- * buffer will be marked dirty, but it will not be written to disk until
- * there is another reason to write it.
- *
- * This routine might get called many times on the same page, if we are making
- * the first scan after commit of an xact that added/deleted many tuples.
- * So, be as quick as we can if the buffer is already dirty.
- */
-void
-SetBufferCommitInfoNeedsSave(Buffer buffer)
-{
- BufferDesc *bufHdr;
-
- if (BufferIsLocal(buffer))
- return;
-
- if (BAD_BUFFER_ID(buffer))
- return;
-
- bufHdr = &BufferDescriptors[buffer - 1];
-
- if ((bufHdr->flags & (BM_DIRTY | BM_JUST_DIRTIED)) !=
- (BM_DIRTY | BM_JUST_DIRTIED))
- {
- SpinAcquire(BufMgrLock);
- Assert(bufHdr->refcount > 0);
- bufHdr->flags |= (BM_DIRTY | BM_JUST_DIRTIED);
- SpinRelease(BufMgrLock);
- }
-}
-
-void
-UnlockBuffers()
-{
- BufferDesc *buf;
- int i;
-
- for (i = 0; i < NBuffers; i++)
- {
- if (BufferLocks[i] == 0)
- continue;
-
- Assert(BufferIsValid(i + 1));
- buf = &(BufferDescriptors[i]);
-
- S_LOCK(&(buf->cntx_lock));
-
- if (BufferLocks[i] & BL_R_LOCK)
- {
- Assert(buf->r_locks > 0);
- (buf->r_locks)--;
- }
- if (BufferLocks[i] & BL_RI_LOCK)
- {
-
- /*
- * Someone else could remove our RI lock when acquiring W
- * lock. This is possible if we came here from elog(ERROR)
- * from IpcSemaphore{Lock|Unlock}(WaitCLSemId). And so we
- * don't do Assert(buf->ri_lock) here.
- */
- buf->ri_lock = false;
- }
- if (BufferLocks[i] & BL_W_LOCK)
- {
- Assert(buf->w_lock);
- buf->w_lock = false;
- }
-
- S_UNLOCK(&(buf->cntx_lock));
-
- BufferLocks[i] = 0;
- }
-}
-
-void
-LockBuffer(Buffer buffer, int mode)
-{
- BufferDesc *buf;
- bits8 *buflock;
-
- Assert(BufferIsValid(buffer));
- if (BufferIsLocal(buffer))
- return;
-
- buf = &(BufferDescriptors[buffer - 1]);
- buflock = &(BufferLocks[buffer - 1]);
-
- S_LOCK(&(buf->cntx_lock));
-
- if (mode == BUFFER_LOCK_UNLOCK)
- {
- if (*buflock & BL_R_LOCK)
- {
- Assert(buf->r_locks > 0);
- Assert(!(buf->w_lock));
- Assert(!(*buflock & (BL_W_LOCK | BL_RI_LOCK)));
- (buf->r_locks)--;
- *buflock &= ~BL_R_LOCK;
- }
- else if (*buflock & BL_W_LOCK)
- {
- Assert(buf->w_lock);
- Assert(buf->r_locks == 0);
- Assert(!(*buflock & (BL_R_LOCK | BL_RI_LOCK)));
- buf->w_lock = false;
- *buflock &= ~BL_W_LOCK;
- }
- else
- elog(ERROR, "UNLockBuffer: buffer %lu is not locked", buffer);
- }
- else if (mode == BUFFER_LOCK_SHARE)
- {
- unsigned i = 0;
-
- Assert(!(*buflock & (BL_R_LOCK | BL_W_LOCK | BL_RI_LOCK)));
- while (buf->ri_lock || buf->w_lock)
- {
- S_UNLOCK(&(buf->cntx_lock));
- s_lock_sleep(i++);
- S_LOCK(&(buf->cntx_lock));
- }
- (buf->r_locks)++;
- *buflock |= BL_R_LOCK;
- }
- else if (mode == BUFFER_LOCK_EXCLUSIVE)
- {
- unsigned i = 0;
-
- Assert(!(*buflock & (BL_R_LOCK | BL_W_LOCK | BL_RI_LOCK)));
- while (buf->r_locks > 0 || buf->w_lock)
- {
- if (buf->r_locks > 3 || (*buflock & BL_RI_LOCK))
- {
-
- /*
- * Our RI lock might be removed by concurrent W lock
- * acquiring (see what we do with RI locks below when our
- * own W acquiring succeeded) and so we set RI lock again
- * if we already did this.
- */
- *buflock |= BL_RI_LOCK;
- buf->ri_lock = true;
- }
- S_UNLOCK(&(buf->cntx_lock));
- s_lock_sleep(i++);
- S_LOCK(&(buf->cntx_lock));
- }
- buf->w_lock = true;
- *buflock |= BL_W_LOCK;
-
- buf->cntxDirty = true;
-
- if (*buflock & BL_RI_LOCK)
- {
-
- /*
- * It's possible to remove RI locks acquired by another W
- * lockers here, but they'll take care about it.
- */
- buf->ri_lock = false;
- *buflock &= ~BL_RI_LOCK;
- }
- }
- else
- elog(ERROR, "LockBuffer: unknown lock mode %d", mode);
-
- S_UNLOCK(&(buf->cntx_lock));
-}
-
-/*
- * Functions for IO error handling
- *
- * Note : We assume that nested buffer IO never occur.
- * i.e at most one io_in_progress spinlock is held
- * per proc.
-*/
-static BufferDesc *InProgressBuf = (BufferDesc *) NULL;
-static bool IsForInput;
-
-/*
- * Function:StartBufferIO
- * (Assumptions)
- * My process is executing no IO
- * BufMgrLock is held
- * BM_IO_IN_PROGRESS mask is not set for the buffer
- * The buffer is Pinned
- *
-*/
-static void
-StartBufferIO(BufferDesc *buf, bool forInput)
-{
- Assert(!InProgressBuf);
- Assert(!(buf->flags & BM_IO_IN_PROGRESS));
- buf->flags |= BM_IO_IN_PROGRESS;
-
- /*
- * There used to be
- *
- * Assert(S_LOCK_FREE(&(buf->io_in_progress_lock)));
- *
- * here, but that's wrong because of the way WaitIO works: someone else
- * waiting for the I/O to complete will succeed in grabbing the lock
- * for a few instructions, and if we context-swap back to here the
- * Assert could fail. Tiny window for failure, but I've seen it
- * happen -- tgl
- */
- S_LOCK(&(buf->io_in_progress_lock));
-
- InProgressBuf = buf;
- IsForInput = forInput;
-}
-
-/*
- * Function:TerminateBufferIO
- * (Assumptions)
- * My process is executing IO for the buffer
- * BufMgrLock is held
- * The buffer is Pinned
- *
-*/
-static void
-TerminateBufferIO(BufferDesc *buf)
-{
- Assert(buf == InProgressBuf);
- S_UNLOCK(&(buf->io_in_progress_lock));
- InProgressBuf = (BufferDesc *) 0;
-}
-
-/*
- * Function:ContinueBufferIO
- * (Assumptions)
- * My process is executing IO for the buffer
- * BufMgrLock is held
- * The buffer is Pinned
- *
-*/
-static void
-ContinueBufferIO(BufferDesc *buf, bool forInput)
-{
- Assert(buf == InProgressBuf);
- Assert(buf->flags & BM_IO_IN_PROGRESS);
- IsForInput = forInput;
-}
-
-#ifdef NOT_USED
-void
-InitBufferIO(void)
-{
- InProgressBuf = (BufferDesc *) 0;
-}
-#endif
-
-/*
- * This function is called from ProcReleaseSpins().
- * BufMgrLock isn't held when this function is called.
- * BM_IO_ERROR is always set. If BM_IO_ERROR was already
- * set in case of output,this routine would kill all
- * backends and reset postmaster.
- */
-void
-AbortBufferIO(void)
-{
- BufferDesc *buf = InProgressBuf;
-
- if (buf)
- {
- Assert(buf->flags & BM_IO_IN_PROGRESS);
- SpinAcquire(BufMgrLock);
- if (IsForInput)
- Assert(!(buf->flags & BM_DIRTY) && !(buf->cntxDirty));
- else
- {
- Assert(buf->flags & BM_DIRTY || buf->cntxDirty);
- if (buf->flags & BM_IO_ERROR)
- {
- elog(NOTICE, "write error may be permanent: cannot write block %u for %s/%s",
- buf->tag.blockNum, buf->blind.dbname, buf->blind.relname);
- }
- buf->flags |= BM_DIRTY;
- }
- buf->flags |= BM_IO_ERROR;
- buf->flags &= ~BM_IO_IN_PROGRESS;
- TerminateBufferIO(buf);
- SpinRelease(BufMgrLock);
- }
-}
-
-/*
- * Cleanup buffer or mark it for cleanup. Buffer may be cleaned
- * up if it's pinned only once.
- *
- * NOTE: buffer must be excl locked.
- */
-void
-MarkBufferForCleanup(Buffer buffer, void (*CleanupFunc)(Buffer))
-{
- BufferDesc *bufHdr = &BufferDescriptors[buffer - 1];
-
- Assert(PrivateRefCount[buffer - 1] > 0);
-
- if (PrivateRefCount[buffer - 1] > 1)
- {
- LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
- PrivateRefCount[buffer - 1]--;
- SpinAcquire(BufMgrLock);
- Assert(bufHdr->refcount > 0);
- bufHdr->flags |= (BM_DIRTY | BM_JUST_DIRTIED);
- bufHdr->CleanupFunc = CleanupFunc;
- SpinRelease(BufMgrLock);
- return;
- }
-
- SpinAcquire(BufMgrLock);
- Assert(bufHdr->refcount > 0);
- if (bufHdr->refcount == 1)
- {
- SpinRelease(BufMgrLock);
- CleanupFunc(buffer);
- CleanupFunc = NULL;
- }
- else
- SpinRelease(BufMgrLock);
-
- LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
- PrivateRefCount[buffer - 1]--;
-
- SpinAcquire(BufMgrLock);
- Assert(bufHdr->refcount > 0);
- bufHdr->flags |= (BM_DIRTY | BM_JUST_DIRTIED);
- bufHdr->CleanupFunc = CleanupFunc;
- bufHdr->refcount--;
- if (bufHdr->refcount == 0)
- {
- AddBufferToFreelist(bufHdr);
- bufHdr->flags |= BM_FREE;
- }
- SpinRelease(BufMgrLock);
- return;
-}
+++ /dev/null
-/*-------------------------------------------------------------------------
- *
- * xlog_localbuf.c
- * local buffer manager. Fast buffer manager for temporary tables
- * or special cases when the operation is not visible to other backends.
- *
- * When a relation is being created, the descriptor will have rd_islocal
- * set to indicate that the local buffer manager should be used. During
- * the same transaction the relation is being created, any inserts or
- * selects from the newly created relation will use the local buffer
- * pool. rd_islocal is reset at the end of a transaction (commit/abort).
- * This is useful for queries like SELECT INTO TABLE and create index.
- *
- * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
- * Portions Copyright (c) 1994-5, Regents of the University of California
- *
- *
- * IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/storage/buffer/Attic/xlog_localbuf.c,v 1.2 2000/11/30 01:39:07 tgl Exp $
- *
- *-------------------------------------------------------------------------
- */
-#include "postgres.h"
-
-#include
-#include
-#include
-#include
-
-#include "executor/execdebug.h"
-#include "storage/buf_internals.h"
-#include "storage/bufmgr.h"
-#include "storage/smgr.h"
-#include "utils/relcache.h"
-
-extern long int LocalBufferFlushCount;
-
-int NLocBuffer = 64;
-BufferDesc *LocalBufferDescriptors = NULL;
-Block *LocalBufferBlockPointers = NULL;
-long *LocalRefCount = NULL;
-
-static int nextFreeLocalBuf = 0;
-
-/*#define LBDEBUG*/
-
-/*
- * LocalBufferAlloc -
- * allocate a local buffer. We do round robin allocation for now.
- */
-BufferDesc *
-LocalBufferAlloc(Relation reln, BlockNumber blockNum, bool *foundPtr)
-{
- int i;
- BufferDesc *bufHdr = (BufferDesc *) NULL;
-
- if (blockNum == P_NEW)
- {
- blockNum = reln->rd_nblocks;
- reln->rd_nblocks++;
- }
-
- /* a low tech search for now -- not optimized for scans */
- for (i = 0; i < NLocBuffer; i++)
- {
- if (LocalBufferDescriptors[i].tag.rnode.relNode ==
- reln->rd_node.relNode &&
- LocalBufferDescriptors[i].tag.blockNum == blockNum)
- {
-
-#ifdef LBDEBUG
- fprintf(stderr, "LB ALLOC (%u,%d) %d\n",
- RelationGetRelid(reln), blockNum, -i - 1);
-#endif
- LocalRefCount[i]++;
- *foundPtr = TRUE;
- return &LocalBufferDescriptors[i];
- }
- }
-
-#ifdef LBDEBUG
- fprintf(stderr, "LB ALLOC (%u,%d) %d\n",
- RelationGetRelid(reln), blockNum, -nextFreeLocalBuf - 1);
-#endif
-
- /* need to get a new buffer (round robin for now) */
- for (i = 0; i < NLocBuffer; i++)
- {
- int b = (nextFreeLocalBuf + i) % NLocBuffer;
-
- if (LocalRefCount[b] == 0)
- {
- bufHdr = &LocalBufferDescriptors[b];
- LocalRefCount[b]++;
- nextFreeLocalBuf = (b + 1) % NLocBuffer;
- break;
- }
- }
- if (bufHdr == NULL)
- elog(ERROR, "no empty local buffer.");
-
- /*
- * this buffer is not referenced but it might still be dirty (the last
- * transaction to touch it doesn't need its contents but has not
- * flushed it). if that's the case, write it out before reusing it!
- */
- if (bufHdr->flags & BM_DIRTY || bufHdr->cntxDirty)
- {
- Relation bufrel = RelationNodeCacheGetRelation(bufHdr->tag.rnode);
-
- Assert(bufrel != NULL);
-
- /* flush this page */
- smgrwrite(DEFAULT_SMGR, bufrel, bufHdr->tag.blockNum,
- (char *) MAKE_PTR(bufHdr->data));
- LocalBufferFlushCount++;
-
- /*
- * drop relcache refcount incremented by
- * RelationIdCacheGetRelation
- */
- RelationDecrementReferenceCount(bufrel);
- }
-
- /*
- * it's all ours now.
- *
- * We need not in tblNode currently but will in future I think,
- * when we'll give up rel->rd_fd to fmgr cache.
- */
- bufHdr->tag.rnode = reln->rd_node;
- bufHdr->tag.blockNum = blockNum;
- bufHdr->flags &= ~BM_DIRTY;
- bufHdr->cntxDirty = false;
-
- /*
- * lazy memory allocation: allocate space on first use of a buffer.
- */
- if (bufHdr->data == (SHMEM_OFFSET) 0)
- {
- char *data = (char *) malloc(BLCKSZ);
-
- if (data == NULL)
- elog(FATAL, "Out of memory in LocalBufferAlloc");
- /*
- * This is a bit of a hack: bufHdr->data needs to be a shmem offset
- * for consistency with the shared-buffer case, so make it one
- * even though it's not really a valid shmem offset.
- */
- bufHdr->data = MAKE_OFFSET(data);
- /*
- * Set pointer for use by BufferGetBlock() macro.
- */
- LocalBufferBlockPointers[-(bufHdr->buf_id + 2)] = (Block) data;
- }
-
- *foundPtr = FALSE;
- return bufHdr;
-}
-
-/*
- * WriteLocalBuffer -
- * writes out a local buffer
- */
-int
-WriteLocalBuffer(Buffer buffer, bool release)
-{
- int bufid;
-
- Assert(BufferIsLocal(buffer));
-
-#ifdef LBDEBUG
- fprintf(stderr, "LB WRITE %d\n", buffer);
-#endif
-
- bufid = -(buffer + 1);
- LocalBufferDescriptors[bufid].flags |= BM_DIRTY;
-
- if (release)
- {
- Assert(LocalRefCount[bufid] > 0);
- LocalRefCount[bufid]--;
- }
-
- return true;
-}
-
-/*
- * InitLocalBuffer -
- * init the local buffer cache. Since most queries (esp. multi-user ones)
- * don't involve local buffers, we delay allocating actual memory for the
- * buffer until we need it.
- */
-void
-InitLocalBuffer(void)
-{
- int i;
-
- /*
- * these aren't going away. I'm not gonna use palloc.
- */
- LocalBufferDescriptors =
- (BufferDesc *) calloc(NLocBuffer, sizeof(BufferDesc));
- LocalBufferBlockPointers = (Block *) calloc(NLocBuffer, sizeof(Block));
- LocalRefCount = (long *) calloc(NLocBuffer, sizeof(long));
- nextFreeLocalBuf = 0;
-
- for (i = 0; i < NLocBuffer; i++)
- {
- BufferDesc *buf = &LocalBufferDescriptors[i];
-
- /*
- * negative to indicate local buffer. This is tricky: shared
- * buffers start with 0. We have to start with -2. (Note that the
- * routine BufferDescriptorGetBuffer adds 1 to buf_id so our first
- * buffer id is -1.)
- */
- buf->buf_id = -i - 2;
- }
-}
-
-/*
- * LocalBufferSync
- *
- * Flush all dirty buffers in the local buffer cache at commit time.
- * Since the buffer cache is only used for keeping relations visible
- * during a transaction, we will not need these buffers again.
- *
- * Note that we have to *flush* local buffers because of them are not
- * visible to checkpoint makers. But we can skip XLOG flush check.
- */
-void
-LocalBufferSync(void)
-{
- int i;
-
- for (i = 0; i < NLocBuffer; i++)
- {
- BufferDesc *buf = &LocalBufferDescriptors[i];
- Relation bufrel;
-
- if (buf->flags & BM_DIRTY || buf->cntxDirty)
- {
-#ifdef LBDEBUG
- fprintf(stderr, "LB SYNC %d\n", -i - 1);
-#endif
- bufrel = RelationNodeCacheGetRelation(buf->tag.rnode);
-
- Assert(bufrel != NULL);
-
- smgrwrite(DEFAULT_SMGR, bufrel, buf->tag.blockNum,
- (char *) MAKE_PTR(buf->data));
- smgrmarkdirty(DEFAULT_SMGR, bufrel, buf->tag.blockNum);
- LocalBufferFlushCount++;
-
- /* drop relcache refcount from RelationIdCacheGetRelation */
- RelationDecrementReferenceCount(bufrel);
-
- buf->flags &= ~BM_DIRTY;
- buf->cntxDirty = false;
- }
- }
-
- MemSet(LocalRefCount, 0, sizeof(long) * NLocBuffer);
- nextFreeLocalBuf = 0;
-}
-
-void
-ResetLocalBufferPool(void)
-{
- int i;
-
- for (i = 0; i < NLocBuffer; i++)
- {
- BufferDesc *buf = &LocalBufferDescriptors[i];
-
- buf->tag.rnode.relNode = InvalidOid;
- buf->flags &= ~BM_DIRTY;
- buf->cntxDirty = false;
- }
-
- MemSet(LocalRefCount, 0, sizeof(long) * NLocBuffer);
- nextFreeLocalBuf = 0;
-}
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/storage/file/fd.c,v 1.67 2000/11/23 01:08:57 vadim Exp $
+ * $Header: /cvsroot/pgsql/src/backend/storage/file/fd.c,v 1.68 2000/11/30 08:46:23 vadim Exp $
*
* NOTES:
*
static char *filepath(char *filename);
static long pg_nofile(void);
-#ifndef XLOG
-/*
- * pg_fsync --- same as fsync except does nothing if -F switch was given
- */
-int
-pg_fsync(int fd)
-{
- if (enableFsync)
- return fsync(fd);
- else
- return 0;
-}
-#endif
-
/*
* BasicOpenFile --- same as open(2) except can free other FDs if needed
*
vfdP->fileFlags = fileFlags & ~(O_TRUNC | O_EXCL);
vfdP->fileMode = fileMode;
vfdP->seekPos = 0;
-#ifdef XLOG
/*
* Have to fsync file on commit. Alternative way - log
* file creation and fsync log before actual file creation.
if (fileFlags & O_CREAT)
vfdP->fdstate = FD_DIRTY;
else
-#endif
vfdP->fdstate = 0x0;
return file;
FileAccess(file);
returnCode = write(VfdCache[file].fd, buffer, amount);
if (returnCode > 0)
- {
VfdCache[file].seekPos += returnCode;
-#ifndef XLOG
- /* mark the file as needing fsync */
- VfdCache[file].fdstate |= FD_DIRTY;
-#endif
- }
else
VfdCache[file].seekPos = FileUnknownPos;
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/storage/smgr/md.c,v 1.79 2000/11/10 03:53:45 vadim Exp $
+ * $Header: /cvsroot/pgsql/src/backend/storage/smgr/md.c,v 1.80 2000/11/30 08:46:24 vadim Exp $
*
*-------------------------------------------------------------------------
*/
elog(DEBUG, "mdblindwrt: write() failed: %m");
status = SM_FAIL;
}
-#ifndef XLOG
- else if (dofsync &&
- pg_fsync(fd) < 0)
- {
- elog(DEBUG, "mdblindwrt: fsync() failed: %m");
- status = SM_FAIL;
- }
-#endif
if (close(fd) < 0)
{
return SM_SUCCESS;
}
-#ifdef XLOG
/*
* mdsync() -- Sync storage.
*
sync();
return SM_SUCCESS;
}
-#endif
/*
* _fdvec_alloc () -- grab a free (or new) md file descriptor vector.
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/storage/smgr/smgr.c,v 1.45 2000/11/21 21:16:01 petere Exp $
+ * $Header: /cvsroot/pgsql/src/backend/storage/smgr/smgr.c,v 1.46 2000/11/30 08:46:24 vadim Exp $
*
*-------------------------------------------------------------------------
*/
int (*smgr_truncate) (Relation reln, int nblocks);
int (*smgr_commit) (void); /* may be NULL */
int (*smgr_abort) (void); /* may be NULL */
-#ifdef XLOG
int (*smgr_sync) (void);
-#endif
} f_smgr;
/*
/* magnetic disk */
{mdinit, NULL, mdcreate, mdunlink, mdextend, mdopen, mdclose,
mdread, mdwrite, mdflush, mdblindwrt, mdmarkdirty, mdblindmarkdirty,
-#ifdef XLOG
mdnblocks, mdtruncate, mdcommit, mdabort, mdsync
-#else
- mdnblocks, mdtruncate, mdcommit, mdabort
-#endif
},
#ifdef STABLE_MEMORY_STORAGE
return SM_SUCCESS;
}
-#ifdef XLOG
int
smgrsync()
{
return SM_SUCCESS;
}
-#endif
#ifdef NOT_USED
bool
#endif
-#ifdef XLOG
-
void
smgr_redo(XLogRecPtr lsn, XLogRecord *record)
{
smgr_desc(char *buf, uint8 xl_info, char* rec)
{
}
-#endif
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/utils/cache/relcache.c,v 1.116 2000/11/10 00:33:10 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/utils/cache/relcache.c,v 1.117 2000/11/30 08:46:24 vadim Exp $
*
*-------------------------------------------------------------------------
*/
}
}
-#ifdef XLOG /* used by XLogInitCache */
-
+/* used by XLogInitCache */
void CreateDummyCaches(void);
void DestroyDummyCaches(void);
MemoryContextSwitchTo(oldcxt);
}
-#endif /* XLOG */
-
static void
AttrDefaultFetch(Relation relation)
{
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/utils/init/postinit.c,v 1.73 2000/11/28 23:27:57 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/utils/init/postinit.c,v 1.74 2000/11/30 08:46:25 vadim Exp $
*
*
*-------------------------------------------------------------------------
{
bool bootstrap = IsBootstrapProcessingMode();
-#ifndef XLOG
- if (!TransactionFlushEnabled())
- on_shmem_exit(FlushBufferPool, 0);
-#endif
-
SetDatabaseName(dbname);
/* ----------------
* initialize the database id used for system caches and lock tables
if (bootstrap)
{
MyDatabaseId = TemplateDbOid;
-#ifdef OLD_FILE_NAMING
- SetDatabasePath(ExpandDatabasePath(dbname));
-#else
SetDatabasePath(GetDatabasePath(MyDatabaseId));
-#endif
LockDisable(true);
}
else
"Database \"%s\" does not exist in the system catalog.",
dbname);
-#ifdef OLD_FILE_NAMING
- fullpath = ExpandDatabasePath(datpath);
- if (!fullpath)
- elog(FATAL, "Database path could not be resolved.");
-#else
fullpath = GetDatabasePath(MyDatabaseId);
-#endif
/* Verify the database path */
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: htup.h,v 1.40 2000/11/30 01:47:32 vadim Exp $
+ * $Id: htup.h,v 1.41 2000/11/30 08:46:25 vadim Exp $
*
*-------------------------------------------------------------------------
*/
typedef HeapTupleHeaderData *HeapTupleHeader;
-
-#ifdef XLOG
-
-/* XLOG stuff */
-
/*
* XLOG allows to store some information in high 4 bits of log
* record xl_info field
#define SizeOfHeapUpdate (offsetof(xl_heap_update, mask) + sizeof(uint8))
-/* end of XLOG stuff */
-
-#endif /* XLOG */
-
-
/*
* MaxTupleSize is the maximum allowed size of a tuple, including header and
* MAXALIGN alignment padding. Basically it's BLCKSZ minus the other stuff
#define MaxTupleSize \
(BLCKSZ - MAXALIGN(sizeof(PageHeaderData) + MaxSpecialSpace))
-
/*
* MaxAttrSize is a somewhat arbitrary upper limit on the declared size of
* data fields of char(n) and similar types. It need not have anything
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: nbtree.h,v 1.47 2000/11/21 21:16:05 petere Exp $
+ * $Id: nbtree.h,v 1.48 2000/11/30 08:46:25 vadim Exp $
*
*-------------------------------------------------------------------------
*/
#define BTP_ROOT (1 << 1) /* It's the root page (has no parent) */
#define BTP_FREE (1 << 2) /* not currently used... */
#define BTP_META (1 << 3) /* Set in the meta-page only */
-
-#ifdef XLOG
#define BTP_REORDER (1 << 4) /* items must be re-ordered */
-#endif
} BTPageOpaqueData;
typedef BTPageOpaqueData *BTPageOpaque;
#define P_FIRSTKEY ((OffsetNumber) 2)
#define P_FIRSTDATAKEY(opaque) (P_RIGHTMOST(opaque) ? P_HIKEY : P_FIRSTKEY)
-
-#ifdef XLOG
-
-/* XLOG stuff */
-
/*
* XLOG allows to store some information in high 4 bits of log
* record xl_info field
#define SizeOfBtreeInsert (offsetof(xl_btreetid, tid) + SizeOfIptrData)
-
/*
* This is what we need to know about insert with split -
* 22 + {4 + 8 | left hi-key} + [btitem] + right sibling btitems. Note that
#define SizeOfBtreeNewroot (offsetof(xl_btree_newroot, rootblk) + sizeof(BlockIdData))
-/* end of XLOG stuff */
-
-#endif /* XLOG */
-
/*
* Operator strategy numbers -- ordering of these is <, <=, =, >=, >
*/
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: transam.h,v 1.27 2000/11/21 21:16:05 petere Exp $
+ * $Id: transam.h,v 1.28 2000/11/30 08:46:25 vadim Exp $
*
* NOTES
* Transaction System Version 101 now support proper oid
* transaction page definitions
* ----------------
*/
-#ifdef XLOG
#define TP_DataSize (BLCKSZ - sizeof(XLogRecPtr))
-#else
-#define TP_DataSize BLCKSZ
-#endif
#define TP_NumXidStatusPerBlock (TP_DataSize * 4)
/* ----------------
*/
typedef struct LogRelationContentsData
{
-#ifdef XLOG
XLogRecPtr LSN; /* temp hack: LSN is member of any block */
/* so should be described in bufmgr */
-#endif
int TransSystemVersion;
} LogRelationContentsData;
*/
typedef struct VariableRelationContentsData
{
-#ifdef XLOG
XLogRecPtr LSN;
-#endif
int TransSystemVersion;
TransactionId nextXidData;
TransactionId lastXidData; /* unused */
typedef VariableRelationContentsData *VariableRelationContents;
/*
- * VariableCache is placed in shmem and used by backends to
- * get next available XID & OID without access to
- * variable relation. Actually, I would like to have two
- * different on-disk storages for next XID and OID...
- * But hoping that someday we will use per database OID
- * generator I leaved this as is. - vadim 07/21/98
+ * VariableCache is placed in shmem and used by
+ * backends to get next available XID & OID.
*/
typedef struct VariableCacheData
{
-#ifndef XLOG
- uint32 xid_count;
-#endif
- TransactionId nextXid;
- Oid nextOid;
- uint32 oidCount;
+ TransactionId nextXid;
+ Oid nextOid;
+ uint32 oidCount;
} VariableCacheData;
typedef VariableCacheData *VariableCache;
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: xact.h,v 1.30 2000/11/21 21:16:05 petere Exp $
+ * $Id: xact.h,v 1.31 2000/11/30 08:46:25 vadim Exp $
*
*-------------------------------------------------------------------------
*/
#define StoreInvalidTransactionId(dest) \
(*((TransactionId*) (dest)) = NullTransactionId)
-
-#ifdef XLOG
-
/*
* XLOG allows to store some information in high 4 bits of log
* record xl_info field
#define SizeOfXactAbort ((offsetof(xl_xact_abort, xtime) + sizeof(time_t)))
-#endif
-
/* ----------------
* extern definitions
* ----------------
-
#ifndef XLOG_UTILS_H
+#define XLOG_UTILS_H
#include "access/rmgr.h"
#include "utils/rel.h"
* or in config.h afterwards. Of course, if you edit config.h, then your
* changes will be overwritten the next time you run configure.
*
- * $Id: config.h.in,v 1.150 2000/11/29 20:59:54 tgl Exp $
+ * $Id: config.h.in,v 1.151 2000/11/30 08:46:25 vadim Exp $
*/
#ifndef CONFIG_H
# define HAVE_UNIX_SOCKETS 1
#endif
-/* Enable WAL. Don't disable this, it was only used during development. */
-#define XLOG 1
-
/*
*------------------------------------------------------------------------
* These hand-configurable symbols are for enabling debugging code,
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: buf_internals.h,v 1.45 2000/11/30 01:39:08 tgl Exp $
+ * $Id: buf_internals.h,v 1.46 2000/11/30 08:46:26 vadim Exp $
*
*-------------------------------------------------------------------------
*/
#include "storage/lmgr.h"
#include "storage/s_lock.h"
-
/* Buf Mgr constants */
/* in bufmgr.c */
extern int Data_Descriptors;
extern int ShowPinTrace;
-
/*
* Flags for buffer descriptors
*/
bool ri_lock; /* read-intent lock */
bool w_lock; /* context exclusively locked */
-#ifdef XLOG
bool cntxDirty; /* new way to mark block as dirty */
-#endif
BufferBlindId blind; /* was used to support blind write */
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: bufmgr.h,v 1.45 2000/11/30 01:39:08 tgl Exp $
+ * $Id: bufmgr.h,v 1.46 2000/11/30 08:46:26 vadim Exp $
*
*-------------------------------------------------------------------------
*/
extern bool BufferIsUpdatable(Buffer buffer);
extern void MarkBufferForCleanup(Buffer buffer, void (*CleanupFunc)(Buffer));
-#ifdef XLOG
extern void BufmgrCommit(void);
extern void BufferSync(void);
-#endif
extern void InitLocalBuffer(void);
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: bufpage.h,v 1.36 2000/11/20 21:12:26 vadim Exp $
+ * $Id: bufpage.h,v 1.37 2000/11/30 08:46:26 vadim Exp $
*
*-------------------------------------------------------------------------
*/
*/
typedef struct PageHeaderData
{
-#ifdef XLOG /* XXX LSN is member of *any* block, not */
+ /* XXX LSN is member of *any* block, not */
/* only page-organized - 'll change later */
XLogRecPtr pd_lsn; /* LSN: next byte after last byte of xlog */
/* record for last change of this page */
StartUpID pd_sui; /* SUI of last changes (currently it's */
/* used by heap AM only) */
-#endif
+
LocationIndex pd_lower; /* offset to start of free space */
LocationIndex pd_upper; /* offset to end of free space */
LocationIndex pd_special; /* offset to start of special space */
(sizeof(PageHeaderData) - sizeof(ItemIdData)))) \
/ ((int) sizeof(ItemIdData)))
-#ifdef XLOG
-
#define PageGetLSN(page) \
(((PageHeader) (page))->pd_lsn)
#define PageSetLSN(page, lsn) \
#define PageSetSUI(page, sui) \
(((PageHeader) (page))->pd_sui = (StartUpID) (sui))
-#endif
-
/* ----------------------------------------------------------------
* extern declarations
* ----------------------------------------------------------------
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: fd.h,v 1.23 2000/11/10 03:53:45 vadim Exp $
+ * $Id: fd.h,v 1.24 2000/11/30 08:46:26 vadim Exp $
*
*-------------------------------------------------------------------------
*/
extern void closeAllVfds(void);
extern void AtEOXact_Files(void);
-#ifdef XLOG
#define pg_fsync(fd) fsync(fd)
-#else
-extern int pg_fsync(int fd);
-#endif
#endif /* FD_H */
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: smgr.h,v 1.25 2000/11/21 21:16:05 petere Exp $
+ * $Id: smgr.h,v 1.26 2000/11/30 08:46:26 vadim Exp $
*
*-------------------------------------------------------------------------
*/
extern int smgrDoPendingDeletes(bool isCommit);
extern int smgrcommit(void);
extern int smgrabort(void);
-
-#ifdef XLOG
extern int smgrsync(void);
extern void smgr_redo(XLogRecPtr lsn, XLogRecord *record);
extern void smgr_undo(XLogRecPtr lsn, XLogRecord *record);
extern void smgr_desc(char *buf, uint8 xl_info, char* rec);
-#endif
/* internals: move me elsewhere -- ay 7/94 */
extern int mdtruncate(Relation reln, int nblocks);
extern int mdcommit(void);
extern int mdabort(void);
-
-#ifdef XLOG
extern int mdsync(void);
-#endif
/* mm.c */
extern SPINLOCK MMCacheLock;
projects / postgresql.git / commitdiff