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📄 backendid.h(1.1 KB)
📄 barrier.h(674 B)
📄 block.h(3.21 KB)
📄 buf.h(1.06 KB)
📄 buf_internals.h(12.24 KB)
📄 buffile.h(1.67 KB)
📄 bufmgr.h(9 KB)
📄 bufpage.h(14.91 KB)
📄 checksum.h(666 B)
📄 checksum_impl.h(8.59 KB)
📄 copydir.h(561 B)
📄 dsm.h(1.95 KB)
📄 dsm_impl.h(2.12 KB)
📄 fd.h(4.27 KB)
📄 freespace.h(1.36 KB)
📄 fsm_internals.h(2.26 KB)
📄 indexfsm.h(795 B)
📄 ipc.h(2.67 KB)
📄 item.h(469 B)
📄 itemid.h(4.24 KB)
📄 itemptr.h(3.93 KB)
📄 large_object.h(3.6 KB)
📄 latch.h(6.55 KB)
📄 lmgr.h(4.19 KB)
📄 lock.h(22.89 KB)
📄 lockdefs.h(1.86 KB)
📄 lwlock.h(9.19 KB)
📄 lwlocknames.h(2.42 KB)
📄 off.h(1.58 KB)
📄 pg_sema.h(2.39 KB)
📄 pg_shmem.h(2.23 KB)
📄 pmsignal.h(2.1 KB)
📄 pos.h(1.56 KB)
📄 predicate.h(2.56 KB)
📄 predicate_internals.h(16.96 KB)
📄 proc.h(10.81 KB)
📄 procarray.h(3.5 KB)
📄 procsignal.h(1.9 KB)
📄 reinit.h(592 B)
📄 relfilenode.h(3.81 KB)
📄 s_lock.h(28.64 KB)
📄 shm_mq.h(2.59 KB)
📄 shm_toc.h(2.01 KB)
📄 shmem.h(2.63 KB)
📄 sinval.h(5.41 KB)
📄 sinvaladt.h(1.58 KB)
📄 smgr.h(5.96 KB)
📄 spin.h(2.42 KB)
📄 standby.h(3.35 KB)
📄 standbydefs.h(2.25 KB)

Editing: large_object.h

/*-------------------------------------------------------------------------
 *
 * large_object.h
 *	  Declarations for PostgreSQL large objects.  POSTGRES 4.2 supported
 *	  zillions of large objects (internal, external, jaquith, inversion).
 *	  Now we only support inversion.
 *
 * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/storage/large_object.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef LARGE_OBJECT_H
#define LARGE_OBJECT_H

#include "utils/snapshot.h"

/*----------
 * Data about a currently-open large object.
 *
 * id is the logical OID of the large object
 * 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
 *
 * NOTE: in current usage, flag bit IFS_RDLOCK is *always* set, and we don't
 * bother to test for it.  Permission checks are made at first read or write
 * attempt, not during inv_open(), so we have other bits to remember that.
 *
 * NOTE: before 7.1, we also had to store references to the separate table
 * and index of a specific large object.  Now they all live in pg_largeobject
 * and are accessed via a common relation descriptor.
 *----------
 */
typedef struct LargeObjectDesc
{
	Oid			id;				/* LO's identifier */
	Snapshot	snapshot;		/* snapshot to use */
	SubTransactionId subid;		/* owning subtransaction ID */
	uint64		offset;			/* current seek pointer */
	int			flags;			/* see flag bits below */

/* bits in flags: */
#define IFS_RDLOCK		(1 << 0)	/* LO was opened for reading */
#define IFS_WRLOCK		(1 << 1)	/* LO was opened for writing */
#define IFS_RD_PERM_OK	(1 << 2)	/* read permission has been verified */
#define IFS_WR_PERM_OK	(1 << 3)	/* write permission has been verified */

} LargeObjectDesc;

/*
 * Each "page" (tuple) of a large object can hold this much data
 *
 * We could set this as high as BLCKSZ less some overhead, but it seems
 * better to make it a smaller value, so that not as much space is used
 * up when a page-tuple is updated.  Note that the value is deliberately
 * chosen large enough to trigger the tuple toaster, so that we will
 * attempt to compress page tuples in-line.  (But they won't be moved off
 * unless the user creates a toast-table for pg_largeobject...)
 *
 * Also, it seems to be a smart move to make the page size be a power of 2,
 * since clients will often be written to send data in power-of-2 blocks.
 * This avoids unnecessary tuple updates caused by partial-page writes.
 *
 * NB: Changing LOBLKSIZE requires an initdb.
 */
#define LOBLKSIZE		(BLCKSZ / 4)

/*
 * Maximum length in bytes for a large object.  To make this larger, we'd
 * have to widen pg_largeobject.pageno as well as various internal variables.
 */
#define MAX_LARGE_OBJECT_SIZE	((int64) INT_MAX * LOBLKSIZE)

/*
 * Function definitions...
 */

/* inversion stuff in inv_api.c */
extern void close_lo_relation(bool isCommit);
extern Oid	inv_create(Oid lobjId);
extern LargeObjectDesc *inv_open(Oid lobjId, int flags, MemoryContext mcxt);
extern void inv_close(LargeObjectDesc *obj_desc);
extern int	inv_drop(Oid lobjId);
extern int64 inv_seek(LargeObjectDesc *obj_desc, int64 offset, int whence);
extern int64 inv_tell(LargeObjectDesc *obj_desc);
extern int	inv_read(LargeObjectDesc *obj_desc, char *buf, int nbytes);
extern int	inv_write(LargeObjectDesc *obj_desc, const char *buf, int nbytes);
extern void inv_truncate(LargeObjectDesc *obj_desc, int64 len);

#endif   /* LARGE_OBJECT_H */

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Editing: large_object.h

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