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Postgres FD Implementation
Commit 922c83fe authored by Bruce Momjian's avatar Bruce Momjian
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OK...here is a patch that will cause the magnetic disk storage 

manager to not try to split files in 2 gig chunks.  It will just
try to get another block.

If applied, everything is just as before. But if LET_OS_MANAGE_FILESIZE
is defined, the chaining disappears and the file just keeps on
going, and going, and going, til the OS barfs.

Darren King
parent 59203450
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Inline Side-by-side
Showing with 128 additions and 4 deletions
src/backend/storage/smgr/md.c
View file @ 922c83fe
......@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/smgr/md.c,v 1.29 1998/02/26 04:36:16 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/smgr/md.c,v 1.30 1998/03/20 04:22:54 momjian Exp $
*
*-------------------------------------------------------------------------
*/
......@@ -45,7 +45,9 @@ typedef struct _MdfdVec
uint16 mdfd_flags; /* clean, dirty, free */
int mdfd_lstbcnt; /* most recent block count */
int mdfd_nextFree; /* next free vector */
#ifndef LET_OS_MANAGE_FILESIZE
struct _MdfdVec *mdfd_chain;/* for large relations */
#endif
} MdfdVec;
static int Nfds = 100;
......@@ -70,9 +72,16 @@ static MemoryContext MdCxt;
* (((2 ** 23) / BLCKSZ) * (2 ** 8))
*
* 07 Jan 98 darrenk
*
* Now possibly let the OS handle it...
*
* 19 Mar 98 darrenk
*
*/
#ifndef LET_OS_MANAGE_FILESIZE
#define RELSEG_SIZE ((8388608 / BLCKSZ) * 256)
#endif
/* routines declared here */
static MdfdVec *_mdfd_openseg(Relation reln, int segno, int oflags);
......@@ -159,7 +168,9 @@ mdcreate(Relation reln)
Md_fdvec[vfd].mdfd_vfd = fd;
Md_fdvec[vfd].mdfd_flags = (uint16) 0;
#ifndef LET_OS_MANAGE_FILESIZE
Md_fdvec[vfd].mdfd_chain = (MdfdVec *) NULL;
#endif
Md_fdvec[vfd].mdfd_lstbcnt = 0;
return (vfd);
......@@ -203,6 +214,7 @@ mdunlink(Relation reln)
Md_fdvec[fd].mdfd_flags = (uint16) 0;
oldcxt = MemoryContextSwitchTo(MdCxt);
#ifndef LET_OS_MANAGE_FILESIZE
for (v = &Md_fdvec[fd]; v != (MdfdVec *) NULL;)
{
FileUnlink(v->mdfd_vfd);
......@@ -212,6 +224,13 @@ mdunlink(Relation reln)
pfree(ov);
}
Md_fdvec[fd].mdfd_chain = (MdfdVec *) NULL;
#else
v = &Md_fdvec[fd];
if (v != (MdfdVec *) NULL)
{
FileUnlink(v->mdfd_vfd);
}
#endif
MemoryContextSwitchTo(oldcxt);
_fdvec_free(fd);
......@@ -245,6 +264,7 @@ mdextend(Relation reln, char *buffer)
v->mdfd_flags |= MDFD_DIRTY;
/* try to keep the last block count current, though it's just a hint */
#ifndef LET_OS_MANAGE_FILESIZE
if ((v->mdfd_lstbcnt = (++nblocks % RELSEG_SIZE)) == 0)
v->mdfd_lstbcnt = RELSEG_SIZE;
......@@ -253,6 +273,9 @@ mdextend(Relation reln, char *buffer)
|| v->mdfd_lstbcnt > RELSEG_SIZE)
elog(FATAL, "segment too big!");
#endif
#else
v->mdfd_lstbcnt = ++nblocks;
#endif
return (SM_SUCCESS);
}
......@@ -281,12 +304,14 @@ mdopen(Relation reln)
Md_fdvec[vfd].mdfd_vfd = fd;
Md_fdvec[vfd].mdfd_flags = (uint16) 0;
Md_fdvec[vfd].mdfd_chain = (MdfdVec *) NULL;
Md_fdvec[vfd].mdfd_lstbcnt = _mdnblocks(fd, BLCKSZ);
#ifndef LET_OS_MANAGE_FILESIZE
Md_fdvec[vfd].mdfd_chain = (MdfdVec *) NULL;
#ifdef DIAGNOSTIC
if (Md_fdvec[vfd].mdfd_lstbcnt > RELSEG_SIZE)
elog(FATAL, "segment too big on relopen!");
#endif
#endif
return (vfd);
......@@ -311,6 +336,7 @@ mdclose(Relation reln)
fd = RelationGetFile(reln);
oldcxt = MemoryContextSwitchTo(MdCxt);
#ifndef LET_OS_MANAGE_FILESIZE
for (v = &Md_fdvec[fd]; v != (MdfdVec *) NULL;)
{
/* if not closed already */
......@@ -335,8 +361,28 @@ mdclose(Relation reln)
pfree(ov);
}
MemoryContextSwitchTo(oldcxt);
Md_fdvec[fd].mdfd_chain = (MdfdVec *) NULL;
#else
v = &Md_fdvec[fd];
if (v != (MdfdVec *) NULL)
{
if (v->mdfd_vfd >= 0)
{
/*
* We sync the file descriptor so that we don't need to reopen
* it at transaction commit to force changes to disk.
*/
FileSync(v->mdfd_vfd);
FileClose(v->mdfd_vfd);
/* mark this file descriptor as clean in our private table */
v->mdfd_flags &= ~MDFD_DIRTY;
}
}
#endif
MemoryContextSwitchTo(oldcxt);
_fdvec_free(fd);
......@@ -358,12 +404,16 @@ mdread(Relation reln, BlockNumber blocknum, char *buffer)
v = _mdfd_getseg(reln, blocknum, 0);
#ifndef LET_OS_MANAGE_FILESIZE
seekpos = (long) (BLCKSZ * (blocknum % RELSEG_SIZE));
#ifdef DIAGNOSTIC
if (seekpos >= BLCKSZ * RELSEG_SIZE)
elog(FATAL, "seekpos too big!");
#endif
#else
seekpos = (long) (BLCKSZ * (blocknum));
#endif
if (FileSeek(v->mdfd_vfd, seekpos, SEEK_SET) != seekpos)
{
......@@ -400,11 +450,15 @@ mdwrite(Relation reln, BlockNumber blocknum, char *buffer)
v = _mdfd_getseg(reln, blocknum, 0);
#ifndef LET_OS_MANAGE_FILESIZE
seekpos = (long) (BLCKSZ * (blocknum % RELSEG_SIZE));
#ifdef DIAGNOSTIC
if (seekpos >= BLCKSZ * RELSEG_SIZE)
elog(FATAL, "seekpos too big!");
#endif
#else
seekpos = (long) (BLCKSZ * (blocknum));
#endif
if (FileSeek(v->mdfd_vfd, seekpos, SEEK_SET) != seekpos)
{
......@@ -435,11 +489,15 @@ mdflush(Relation reln, BlockNumber blocknum, char *buffer)
v = _mdfd_getseg(reln, blocknum, 0);
#ifndef LET_OS_MANAGE_FILESIZE
seekpos = (long) (BLCKSZ * (blocknum % RELSEG_SIZE));
#ifdef DIAGNOSTIC
if (seekpos >= BLCKSZ * RELSEG_SIZE)
elog(FATAL, "seekpos too big!");
#endif
#else
seekpos = (long) (BLCKSZ * (blocknum));
#endif
if (FileSeek(v->mdfd_vfd, seekpos, SEEK_SET) != seekpos)
{
......@@ -483,6 +541,8 @@ mdblindwrt(char *dbstr,
long seekpos;
int status;
char *path;
#ifndef LET_OS_MANAGE_FILESIZE
int nchars;
/* be sure we have enough space for the '.segno', if any */
......@@ -535,12 +595,53 @@ mdblindwrt(char *dbstr,
sprintf(path, "%s%c%s.%d", tmpPath, SEP_CHAR, relstr, segno);
pfree(tmpPath);
}
#else
/* construct the path to the file and open it */
/* system table? then put in system area... */
if (dbid == (Oid) 0)
{
path = (char *) palloc(strlen(DataDir) + sizeof(NameData) + 2);
sprintf(path, "%s/%s", DataDir, relstr);
}
/* user table? then put in user database area... */
else if (dbid == MyDatabaseId)
{
extern char *DatabasePath;
path = (char *) palloc(strlen(DatabasePath) + 2 * sizeof(NameData) + 2);
sprintf(path, "%s%c%s", DatabasePath, SEP_CHAR, relstr);
}
else
/* this is work arround only !!! */
{
char dbpath[MAXPGPATH + 1];
Oid owner,
id;
char *tmpPath;
GetRawDatabaseInfo(dbstr, &owner, &id, dbpath);
if (id != dbid)
elog(FATAL, "mdblindwrt: oid of db %s is not %u", dbstr, dbid);
tmpPath = ExpandDatabasePath(dbpath);
if (tmpPath == NULL)
elog(FATAL, "mdblindwrt: can't expand path for db %s", dbstr);
path = (char *) palloc(strlen(tmpPath) + 2 * sizeof(NameData) + 2);
sprintf(path, "%s%c%s", tmpPath, SEP_CHAR, relstr);
pfree(tmpPath);
}
#endif
if ((fd = open(path, O_RDWR, 0600)) < 0)
return (SM_FAIL);
/* seek to the right spot */
#ifndef LET_OS_MANAGE_FILESIZE
seekpos = (long) (BLCKSZ * (blkno % RELSEG_SIZE));
#else
seekpos = (long) (BLCKSZ * (blkno));
#endif
if (lseek(fd, seekpos, SEEK_SET) != seekpos)
{
close(fd);
......@@ -577,6 +678,7 @@ mdnblocks(Relation reln)
fd = RelationGetFile(reln);
v = &Md_fdvec[fd];
#ifndef LET_OS_MANAGE_FILESIZE
#ifdef DIAGNOSTIC
if (_mdnblocks(v->mdfd_vfd, BLCKSZ) > RELSEG_SIZE)
elog(FATAL, "segment too big in getseg!");
......@@ -607,6 +709,9 @@ mdnblocks(Relation reln)
return ((segno * RELSEG_SIZE) + nblocks);
}
}
#else
return (_mdnblocks(v->mdfd_vfd, BLCKSZ));
#endif
}
/*
......@@ -619,6 +724,8 @@ mdtruncate(Relation reln, int nblocks)
{
int fd;
MdfdVec *v;
#ifndef LET_OS_MANAGE_FILESIZE
int curnblk;
curnblk = mdnblocks(reln);
......@@ -628,6 +735,7 @@ mdtruncate(Relation reln, int nblocks)
&(reln->rd_rel->relname.data[0]));
return (curnblk);
}
#endif
fd = RelationGetFile(reln);
v = &Md_fdvec[fd];
......@@ -657,7 +765,12 @@ mdcommit()
for (i = 0; i < CurFd; i++)
{
#ifndef LET_OS_MANAGE_FILESIZE
for (v = &Md_fdvec[i]; v != (MdfdVec *) NULL; v = v->mdfd_chain)
#else
v = &Md_fdvec[i];
if (v != (MdfdVec *) NULL)
#endif
{
if (v->mdfd_flags & MDFD_DIRTY)
{
......@@ -686,7 +799,12 @@ mdabort()
for (i = 0; i < CurFd; i++)
{
#ifndef LET_OS_MANAGE_FILESIZE
for (v = &Md_fdvec[i]; v != (MdfdVec *) NULL; v = v->mdfd_chain)
#else
v = &Md_fdvec[i];
if (v != (MdfdVec *) NULL)
#endif
{
v->mdfd_flags &= ~MDFD_DIRTY;
}
......@@ -812,12 +930,14 @@ _mdfd_openseg(Relation reln, int segno, int oflags)
/* fill the entry */
v->mdfd_vfd = fd;
v->mdfd_flags = (uint16) 0;
v->mdfd_chain = (MdfdVec *) NULL;
v->mdfd_lstbcnt = _mdnblocks(fd, BLCKSZ);
#ifndef LET_OS_MANAGE_FILESIZE
v->mdfd_chain = (MdfdVec *) NULL;
#ifdef DIAGNOSTIC
if (v->mdfd_lstbcnt > RELSEG_SIZE)
elog(FATAL, "segment too big on open!");
#endif
#endif
/* all done */
......@@ -841,6 +961,7 @@ _mdfd_getseg(Relation reln, int blkno, int oflag)
reln->rd_fd = fd;
}
#ifndef LET_OS_MANAGE_FILESIZE
for (v = &Md_fdvec[fd], segno = blkno / RELSEG_SIZE, i = 1;
segno > 0;
i++, segno--)
......@@ -856,6 +977,9 @@ _mdfd_getseg(Relation reln, int blkno, int oflag)
}
v = v->mdfd_chain;
}
#else
v = &Md_fdvec[fd];
#endif
return (v);
}
......
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