md.h

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/*-------------------------------------------------------------------------
 *
 * md.h
 *    magnetic disk storage manager public interface declarations.
 *
 *
 * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/storage/md.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef MD_H
#define MD_H
 
#include "storage/aio_types.h"
#include "storage/block.h"
#include "storage/relfilelocator.h"
#include "storage/smgr.h"
#include "storage/sync.h"
 
extern PGDLLIMPORT const PgAioHandleCallbacks aio_md_readv_cb;
 
/* md storage manager functionality */
extern void mdinit(void);
extern void mdopen(SMgrRelation reln);
extern void mdclose(SMgrRelation reln, ForkNumber forknum);
extern void mdcreate(SMgrRelation reln, ForkNumber forknum, bool isRedo);
extern bool mdexists(SMgrRelation reln, ForkNumber forknum);
extern void mdunlink(RelFileLocatorBackend rlocator, ForkNumber forknum, bool isRedo);
extern void mdextend(SMgrRelation reln, ForkNumber forknum,
                     BlockNumber blocknum, const void *buffer, bool skipFsync);
extern void mdzeroextend(SMgrRelation reln, ForkNumber forknum,
                         BlockNumber blocknum, int nblocks, bool skipFsync);
extern bool mdprefetch(SMgrRelation reln, ForkNumber forknum,
                       BlockNumber blocknum, int nblocks);
extern uint32 mdmaxcombine(SMgrRelation reln, ForkNumber forknum,
                           BlockNumber blocknum);
extern void mdreadv(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
                    void **buffers, BlockNumber nblocks);
extern void mdstartreadv(PgAioHandle *ioh,
                         SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
                         void **buffers, BlockNumber nblocks);
extern void mdwritev(SMgrRelation reln, ForkNumber forknum,
                     BlockNumber blocknum,
                     const void **buffers, BlockNumber nblocks, bool skipFsync);
extern void mdwriteback(SMgrRelation reln, ForkNumber forknum,
                        BlockNumber blocknum, BlockNumber nblocks);
extern BlockNumber mdnblocks(SMgrRelation reln, ForkNumber forknum);
extern void mdtruncate(SMgrRelation reln, ForkNumber forknum,
                       BlockNumber curnblk, BlockNumber nblocks);
extern void mdimmedsync(SMgrRelation reln, ForkNumber forknum);
extern void mdregistersync(SMgrRelation reln, ForkNumber forknum);
extern int  mdfd(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum, uint32 *off);
 
extern void ForgetDatabaseSyncRequests(Oid dbid);
extern void DropRelationFiles(RelFileLocator *delrels, int ndelrels, bool isRedo);
 
/* md sync callbacks */
extern int  mdsyncfiletag(const FileTag *ftag, char *path);
extern int  mdunlinkfiletag(const FileTag *ftag, char *path);
extern bool mdfiletagmatches(const FileTag *ftag, const FileTag *candidate);
 
#endif                          /* MD_H */