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📁 ..
📄 backendid.h(730 B)
📄 barrier.h(6.6 KB)
📄 block.h(3.21 KB)
📄 buf.h(1.06 KB)
📄 buf_internals.h(7.79 KB)
📄 buffile.h(1.67 KB)
📄 bufmgr.h(7.2 KB)
📄 bufpage.h(12.91 KB)
📄 copydir.h(561 B)
📄 fd.h(3.56 KB)
📄 freespace.h(1.23 KB)
📄 fsm_internals.h(2.24 KB)
📄 indexfsm.h(795 B)
📄 ipc.h(2.54 KB)
📄 item.h(469 B)
📄 itemid.h(4.24 KB)
📄 itemptr.h(3.72 KB)
📄 large_object.h(2.89 KB)
📄 latch.h(5.28 KB)
📄 lmgr.h(3.22 KB)
📄 lock.h(21.16 KB)
📄 lwlock.h(3.58 KB)
📄 off.h(1.58 KB)
📄 pg_sema.h(2.41 KB)
📄 pg_shmem.h(1.95 KB)
📄 pmsignal.h(2.03 KB)
📄 pos.h(1.56 KB)
📄 predicate.h(2.56 KB)
📄 predicate_internals.h(16.98 KB)
📄 proc.h(9.58 KB)
📄 procarray.h(2.96 KB)
📄 procsignal.h(1.76 KB)
📄 reinit.h(588 B)
📄 relfilenode.h(4.31 KB)
📄 s_lock.h(28 KB)
📄 shmem.h(2.63 KB)
📄 sinval.h(4.97 KB)
📄 sinvaladt.h(1.49 KB)
📄 smgr.h(5.67 KB)
📄 spin.h(2.71 KB)
📄 standby.h(3.97 KB)

Editing: block.h

/*-------------------------------------------------------------------------
 *
 * block.h
 *	  POSTGRES disk block definitions.
 *
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/storage/block.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef BLOCK_H
#define BLOCK_H

/*
 * BlockNumber:
 *
 * each data file (heap or index) is divided into postgres disk blocks
 * (which may be thought of as the unit of i/o -- a postgres buffer
 * contains exactly one disk block).  the blocks are numbered
 * sequentially, 0 to 0xFFFFFFFE.
 *
 * InvalidBlockNumber is the same thing as P_NEW in buf.h.
 *
 * the access methods, the buffer manager and the storage manager are
 * more or less the only pieces of code that should be accessing disk
 * blocks directly.
 */
typedef uint32 BlockNumber;

#define InvalidBlockNumber		((BlockNumber) 0xFFFFFFFF)

#define MaxBlockNumber			((BlockNumber) 0xFFFFFFFE)

/*
 * BlockId:
 *
 * this is a storage type for BlockNumber.  in other words, this type
 * is used for on-disk structures (e.g., in HeapTupleData) whereas
 * BlockNumber is the type on which calculations are performed (e.g.,
 * in access method code).
 *
 * there doesn't appear to be any reason to have separate types except
 * for the fact that BlockIds can be SHORTALIGN'd (and therefore any
 * structures that contains them, such as ItemPointerData, can also be
 * SHORTALIGN'd).  this is an important consideration for reducing the
 * space requirements of the line pointer (ItemIdData) array on each
 * page and the header of each heap or index tuple, so it doesn't seem
 * wise to change this without good reason.
 */
typedef struct BlockIdData
{
	uint16		bi_hi;
	uint16		bi_lo;
} BlockIdData;

typedef BlockIdData *BlockId;	/* block identifier */

/* ----------------
 *		support macros
 * ----------------
 */

/*
 * BlockNumberIsValid
 *		True iff blockNumber is valid.
 */
#define BlockNumberIsValid(blockNumber) \
	((bool) ((BlockNumber) (blockNumber) != InvalidBlockNumber))

/*
 * BlockIdIsValid
 *		True iff the block identifier is valid.
 */
#define BlockIdIsValid(blockId) \
	((bool) PointerIsValid(blockId))

/*
 * BlockIdSet
 *		Sets a block identifier to the specified value.
 */
#define BlockIdSet(blockId, blockNumber) \
( \
	AssertMacro(PointerIsValid(blockId)), \
	(blockId)->bi_hi = (blockNumber) >> 16, \
	(blockId)->bi_lo = (blockNumber) & 0xffff \
)

/*
 * BlockIdCopy
 *		Copy a block identifier.
 */
#define BlockIdCopy(toBlockId, fromBlockId) \
( \
	AssertMacro(PointerIsValid(toBlockId)), \
	AssertMacro(PointerIsValid(fromBlockId)), \
	(toBlockId)->bi_hi = (fromBlockId)->bi_hi, \
	(toBlockId)->bi_lo = (fromBlockId)->bi_lo \
)

/*
 * BlockIdEquals
 *		Check for block number equality.
 */
#define BlockIdEquals(blockId1, blockId2) \
	((blockId1)->bi_hi == (blockId2)->bi_hi && \
	 (blockId1)->bi_lo == (blockId2)->bi_lo)

/*
 * BlockIdGetBlockNumber
 *		Retrieve the block number from a block identifier.
 */
#define BlockIdGetBlockNumber(blockId) \
( \
	AssertMacro(BlockIdIsValid(blockId)), \
	(BlockNumber) (((blockId)->bi_hi << 16) | ((uint16) (blockId)->bi_lo)) \
)

#endif   /* BLOCK_H */

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Editing: block.h

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