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

Code Editor : smgr.h

/*-------------------------------------------------------------------------
 *
 * smgr.h
 *	  storage manager switch public interface declarations.
 *
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/storage/smgr.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef SMGR_H
#define SMGR_H

#include "fmgr.h"
#include "storage/block.h"
#include "storage/relfilenode.h"

/*
 * smgr.c maintains a table of SMgrRelation objects, which are essentially
 * cached file handles.  An SMgrRelation is created (if not already present)
 * by smgropen(), and destroyed by smgrclose().  Note that neither of these
 * operations imply I/O, they just create or destroy a hashtable entry.
 * (But smgrclose() may release associated resources, such as OS-level file
 * descriptors.)
 *
 * An SMgrRelation may have an "owner", which is just a pointer to it from
 * somewhere else; smgr.c will clear this pointer if the SMgrRelation is
 * closed.  We use this to avoid dangling pointers from relcache to smgr
 * without having to make the smgr explicitly aware of relcache.  There
 * can't be more than one "owner" pointer per SMgrRelation, but that's
 * all we need.
 *
 * SMgrRelations that do not have an "owner" are considered to be transient,
 * and are deleted at end of transaction.
 */
typedef struct SMgrRelationData
{
	/* rnode is the hashtable lookup key, so it must be first! */
	RelFileNodeBackend smgr_rnode;		/* relation physical identifier */

/* pointer to owning pointer, or NULL if none */
	struct SMgrRelationData **smgr_owner;

/*
	 * These next three fields are not actually used or manipulated by smgr,
	 * except that they are reset to InvalidBlockNumber upon a cache flush
	 * event (in particular, upon truncation of the relation).  Higher levels
	 * store cached state here so that it will be reset when truncation
	 * happens.  In all three cases, InvalidBlockNumber means "unknown".
	 */
	BlockNumber smgr_targblock; /* current insertion target block */
	BlockNumber smgr_fsm_nblocks;		/* last known size of fsm fork */
	BlockNumber smgr_vm_nblocks;	/* last known size of vm fork */

/* additional public fields may someday exist here */

/*
	 * Fields below here are intended to be private to smgr.c and its
	 * submodules.  Do not touch them from elsewhere.
	 */
	int			smgr_which;		/* storage manager selector */

/* for md.c; NULL for forks that are not open */
	struct _MdfdVec *md_fd[MAX_FORKNUM + 1];

/* if unowned, list link in list of all unowned SMgrRelations */
	struct SMgrRelationData *next_unowned_reln;
} SMgrRelationData;

typedef SMgrRelationData *SMgrRelation;

#define SmgrIsTemp(smgr) \
	RelFileNodeBackendIsTemp((smgr)->smgr_rnode)

extern void smgrinit(void);
extern SMgrRelation smgropen(RelFileNode rnode, BackendId backend);
extern bool smgrexists(SMgrRelation reln, ForkNumber forknum);
extern void smgrsetowner(SMgrRelation *owner, SMgrRelation reln);
extern void smgrclearowner(SMgrRelation *owner, SMgrRelation reln);
extern void smgrclose(SMgrRelation reln);
extern void smgrcloseall(void);
extern void smgrclosenode(RelFileNodeBackend rnode);
extern void smgrcreate(SMgrRelation reln, ForkNumber forknum, bool isRedo);
extern void smgrdounlink(SMgrRelation reln, bool isRedo);
extern void smgrdounlinkfork(SMgrRelation reln, ForkNumber forknum, bool isRedo);
extern void smgrextend(SMgrRelation reln, ForkNumber forknum,
		   BlockNumber blocknum, char *buffer, bool skipFsync);
extern void smgrprefetch(SMgrRelation reln, ForkNumber forknum,
			 BlockNumber blocknum);
extern void smgrread(SMgrRelation reln, ForkNumber forknum,
		 BlockNumber blocknum, char *buffer);
extern void smgrwrite(SMgrRelation reln, ForkNumber forknum,
		  BlockNumber blocknum, char *buffer, bool skipFsync);
extern BlockNumber smgrnblocks(SMgrRelation reln, ForkNumber forknum);
extern void smgrtruncate(SMgrRelation reln, ForkNumber forknum,
			 BlockNumber nblocks);
extern void smgrimmedsync(SMgrRelation reln, ForkNumber forknum);
extern void smgrpreckpt(void);
extern void smgrsync(void);
extern void smgrpostckpt(void);
extern void AtEOXact_SMgr(void);

/* internals: move me elsewhere -- ay 7/94 */

/* in md.c */
extern void mdinit(void);
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 void 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 BlockNumber mdnblocks(SMgrRelation reln, ForkNumber forknum);
extern void mdtruncate(SMgrRelation reln, ForkNumber forknum,
		   BlockNumber nblocks);
extern void mdimmedsync(SMgrRelation reln, ForkNumber forknum);
extern void mdpreckpt(void);
extern void mdsync(void);
extern void mdpostckpt(void);

extern void SetForwardFsyncRequests(void);
extern void RememberFsyncRequest(RelFileNode rnode, ForkNumber forknum,
					 BlockNumber segno);
extern void ForgetRelationFsyncRequests(RelFileNode rnode, ForkNumber forknum);
extern void ForgetDatabaseFsyncRequests(Oid dbid);

/* smgrtype.c */
extern Datum smgrout(PG_FUNCTION_ARGS);
extern Datum smgrin(PG_FUNCTION_ARGS);
extern Datum smgreq(PG_FUNCTION_ARGS);
extern Datum smgrne(PG_FUNCTION_ARGS);

#endif   /* SMGR_H */

${this.title}

Code Editor : smgr.h