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Adjust lo_open() so that specifying INV_READ without INV_WRITE creates

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a descriptor that uses the current transaction snapshot, rather than
SnapshotNow as it did before (and still does if INV_WRITE is set).
This means pg_dump will now dump a consistent snapshot of large object
contents, as it never could do before.  Also, add a lo_create() function
that is similar to lo_creat() but allows the desired OID of the large
object to be specified.  This will simplify pg_restore considerably
(but I'll fix that in a separate commit).
This commit is contained in:
Tom Lane
2005-06-13 02:26:53 +00:00
parent f52a34229b
commit a2fb7b8a1f
11 changed files with 265 additions and 96 deletions
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11
src/include/storage/large_object.h
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@@ -8,19 +8,22 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/large_object.h,v 1.31 2004/12/31 22:03:42 pgsql Exp $
* $PostgreSQL: pgsql/src/include/storage/large_object.h,v 1.32 2005/06/13 02:26:52 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef LARGE_OBJECT_H
#define LARGE_OBJECT_H
#include "utils/tqual.h"
/*----------
* Data about a currently-open large object.
*
* id is the logical OID of the large object
* subid is the subtransaction that opened the LO (or currently owns it)
* snapshot is the snapshot to use for read/write operations
* subid is the subtransaction that opened the desc (or currently owns it)
* offset is the current seek offset within the LO
* flags contains some flag bits
*
@@ -32,6 +35,7 @@
typedef struct LargeObjectDesc
{
Oid id; /* LO's identifier */
Snapshot snapshot; /* snapshot to use */
SubTransactionId subid; /* owning subtransaction ID */
uint32 offset; /* current seek pointer */
int flags; /* locking info, etc */
@@ -39,6 +43,7 @@ typedef struct LargeObjectDesc
/* flag bits: */
#define IFS_RDLOCK (1 << 0)
#define IFS_WRLOCK (1 << 1)
} LargeObjectDesc;
@@ -65,7 +70,7 @@ typedef struct LargeObjectDesc
/* inversion stuff in inv_api.c */
extern void close_lo_relation(bool isCommit);
extern LargeObjectDesc *inv_create(int flags);
extern Oid inv_create(Oid lobjId);
extern LargeObjectDesc *inv_open(Oid lobjId, int flags);
extern void inv_close(LargeObjectDesc *obj_desc);
extern int inv_drop(Oid lobjId);