md.h

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/*-------------------------------------------------------------------------
 *
 * md.h
 *    magnetic disk storage manager public interface declarations.
 *
 *
 * Portions Copyright (c) 1996-2020, 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/block.h"
#include "storage/relfilenode.h"
#include "storage/smgr.h"
#include "storage/sync.h"

/* 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(RelFileNodeBackend rnode, ForkNumber forknum, bool isRedo);
extern void mdextend(SMgrRelation reln, ForkNumber forknum,
                     BlockNumber blocknum, char *buffer, bool skipFsync);
extern bool mdprefetch(SMgrRelation reln, ForkNumber forknum,
                       BlockNumber blocknum);
extern void mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
                   char *buffer);
extern void mdwrite(SMgrRelation reln, ForkNumber forknum,
                    BlockNumber blocknum, char *buffer, 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 nblocks);
extern void mdimmedsync(SMgrRelation reln, ForkNumber forknum);

extern void ForgetDatabaseSyncRequests(Oid dbid);
extern void DropRelationFiles(RelFileNode *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 */