1 /*-------------------------------------------------------------------------
2  *
3  * md.h
4  *	  magnetic disk storage manager public interface declarations.
5  *
6  *
7  * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
8  * Portions Copyright (c) 1994, Regents of the University of California
9  *
10  * src/include/storage/md.h
11  *
12  *-------------------------------------------------------------------------
13  */
14 #ifndef MD_H
15 #define MD_H
16 
17 #include "storage/block.h"
18 #include "storage/relfilenode.h"
19 #include "storage/smgr.h"
20 #include "storage/sync.h"
21 
22 /* md storage manager functionality */
23 extern void mdinit(void);
24 extern void mdopen(SMgrRelation reln);
25 extern void mdclose(SMgrRelation reln, ForkNumber forknum);
26 extern void mdcreate(SMgrRelation reln, ForkNumber forknum, bool isRedo);
27 extern bool mdexists(SMgrRelation reln, ForkNumber forknum);
28 extern void mdunlink(RelFileNodeBackend rnode, ForkNumber forknum, bool isRedo);
29 extern void mdextend(SMgrRelation reln, ForkNumber forknum,
30 					 BlockNumber blocknum, char *buffer, bool skipFsync);
31 extern bool mdprefetch(SMgrRelation reln, ForkNumber forknum,
32 					   BlockNumber blocknum);
33 extern void mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
34 				   char *buffer);
35 extern void mdwrite(SMgrRelation reln, ForkNumber forknum,
36 					BlockNumber blocknum, char *buffer, bool skipFsync);
37 extern void mdwriteback(SMgrRelation reln, ForkNumber forknum,
38 						BlockNumber blocknum, BlockNumber nblocks);
39 extern BlockNumber mdnblocks(SMgrRelation reln, ForkNumber forknum);
40 extern void mdtruncate(SMgrRelation reln, ForkNumber forknum,
41 					   BlockNumber nblocks);
42 extern void mdimmedsync(SMgrRelation reln, ForkNumber forknum);
43 
44 extern void ForgetDatabaseSyncRequests(Oid dbid);
45 extern void DropRelationFiles(RelFileNode *delrels, int ndelrels, bool isRedo);
46 
47 /* md sync callbacks */
48 extern int	mdsyncfiletag(const FileTag *ftag, char *path);
49 extern int	mdunlinkfiletag(const FileTag *ftag, char *path);
50 extern bool mdfiletagmatches(const FileTag *ftag, const FileTag *candidate);
51 
52 #endif							/* MD_H */
53