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Postgres FD Implementation
Commit 634b38aa authored by Bryan Henderson's avatar Bryan Henderson
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Add asserts to check for file descriptor ring corruption.

parent 4a5135c3
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Showing with 293 additions and 285 deletions
src/backend/storage/file/fd.c
View file @ 634b38aa
......@@ -6,7 +6,7 @@
* Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Id: fd.c,v 1.10 1996/12/04 03:05:58 bryanh Exp $
* $Id: fd.c,v 1.11 1996/12/27 22:57:51 bryanh Exp $
*
* NOTES:
*
......@@ -48,7 +48,7 @@
#include <fcntl.h>
#include "postgres.h"
#include "miscadmin.h" /* for DataDir */
#include "miscadmin.h" /* for DataDir */
#include "utils/palloc.h"
#include "storage/fd.h"
......@@ -81,7 +81,7 @@
* equivalent, the OS must still open several files to perform the
* dynamic loading. Keep this here.)
*/
#define RESERVE_FOR_LD 10
#define RESERVE_FOR_LD 10
/*
* If we are using weird storage managers, we may need to keep real
......@@ -93,10 +93,10 @@
* these descriptors at whim, we must make allowances for them.
*/
#ifdef HP_JUKEBOX
#define RESERVE_FOR_JB 25
#define MAXFILES ((NOFILE - RESERVE_FOR_LD) - RESERVE_FOR_JB)
#define RESERVE_FOR_JB 25
#define MAXFILES ((NOFILE - RESERVE_FOR_LD) - RESERVE_FOR_JB)
#else /* HP_JUKEBOX */
#define MAXFILES (NOFILE - RESERVE_FOR_LD)
#define MAXFILES (NOFILE - RESERVE_FOR_LD)
#endif /* HP_JUKEBOX */
/* Debugging.... */
......@@ -115,36 +115,36 @@
#define FileIsNotOpen(file) (VfdCache[file].fd == VFD_CLOSED)
typedef struct vfd {
signed short fd;
unsigned short fdstate;
#define FD_DIRTY (1 << 0)
File nextFree;
File lruMoreRecently;
File lruLessRecently;
long seekPos;
char *fileName;
int fileFlags;
int fileMode;
signed short fd;
unsigned short fdstate;
#define FD_DIRTY (1 << 0)
File nextFree;
File lruMoreRecently;
File lruLessRecently;
long seekPos;
char *fileName;
int fileFlags;
int fileMode;
} Vfd;
/*
* Virtual File Descriptor array pointer and size. This grows as
* needed.
*/
static Vfd *VfdCache;
static Size SizeVfdCache = 0;
static Vfd *VfdCache;
static Size SizeVfdCache = 0;
/*
* Minimum number of file descriptors known to be free.
*/
static int FreeFd = 0;
static int FreeFd = 0;
/*
* Number of file descriptors known to be open.
*/
static int nfile = 0;
static int nfile = 0;
/*
* we use the name of the null device in various places, mostly so
......@@ -162,14 +162,16 @@ static char Sep_char = '\\';
/*
* Private Routines
*
* Delete - delete a file from the Lru ring
* LruDelete - remove a file from the Lru ring and close
* Insert - put a file at the front of the Lru ring
* LruInsert - put a file at the front of the Lru ring and open
* Delete - delete a file from the Lru ring
* LruDelete - remove a file from the Lru ring and close
* Insert - put a file at the front of the Lru ring
* LruInsert - put a file at the front of the Lru ring and open
* AssertLruRoom - make sure that there is a free fd.
*
* the Last Recently Used ring is a doubly linked list that begins and
* ends on element zero.
* ends on element zero. Element zero is special -- it doesn't represent
* a file and its "fd" field always == VFD_CLOSED. Element zero is just an
* anchor that shows us the beginning/end of the ring.
*
* example:
*
......@@ -180,8 +182,8 @@ static char Sep_char = '\\';
* \\less--> MostRecentlyUsedFile <---/ |
* \more---/ \--less--/
*
* AllocateVfd - grab a free (or new) file record (from VfdArray)
* FreeVfd - free a file record
* AllocateVfd - grab a free (or new) file record (from VfdArray)
* FreeVfd - free a file record
*
*/
static void Delete(File file);
......@@ -213,11 +215,11 @@ _dump_lru()
printf("MOST %d ", mru);
while (mru != 0)
{
mru = vfdP->lruLessRecently;
vfdP = &VfdCache[mru];
printf("%d ", mru);
}
{
mru = vfdP->lruLessRecently;
vfdP = &VfdCache[mru];
printf("%d ", mru);
}
printf("LEAST\n");
}
#endif /* FDDEBUG */
......@@ -225,10 +227,10 @@ _dump_lru()
static void
Delete(File file)
{
Vfd *fileP;
Vfd *fileP;
DO_DB(printf("DEBUG: Delete %d (%s)\n",
file, VfdCache[file].fileName));
DO_DB(printf("DEBUG: Delete %d (%s)\n",
file, VfdCache[file].fileName));
DO_DB(_dump_lru());
Assert(file != 0);
......@@ -236,9 +238,9 @@ Delete(File file)
fileP = &VfdCache[file];
VfdCache[fileP->lruLessRecently].lruMoreRecently =
VfdCache[file].lruMoreRecently;
VfdCache[file].lruMoreRecently;
VfdCache[fileP->lruMoreRecently].lruLessRecently =
VfdCache[file].lruLessRecently;
VfdCache[file].lruLessRecently;
DO_DB(_dump_lru());
}
......@@ -247,10 +249,10 @@ static void
LruDelete(File file)
{
Vfd *fileP;
int returnValue;
int returnValue;
DO_DB(printf("DEBUG: LruDelete %d (%s)\n",
file, VfdCache[file].fileName));
DO_DB(printf("DEBUG: LruDelete %d (%s)\n",
file, VfdCache[file].fileName));
Assert(file != 0);
......@@ -265,9 +267,9 @@ LruDelete(File file)
/* if we have written to the file, sync it */
if (fileP->fdstate & FD_DIRTY) {
returnValue = fsync(fileP->fd);
Assert(returnValue != -1);
fileP->fdstate &= ~FD_DIRTY;
returnValue = fsync(fileP->fd);
Assert(returnValue != -1);
fileP->fdstate &= ~FD_DIRTY;
}
/* close the file */
......@@ -284,10 +286,10 @@ LruDelete(File file)
static void
Insert(File file)
{
Vfd *vfdP;
Vfd *vfdP;
DO_DB(printf("DEBUG: Insert %d (%s)\n",
file, VfdCache[file].fileName));
DO_DB(printf("DEBUG: Insert %d (%s)\n",
file, VfdCache[file].fileName));
DO_DB(_dump_lru());
vfdP = &VfdCache[file];
......@@ -303,58 +305,58 @@ Insert(File file)
static int
LruInsert (File file)
{
Vfd *vfdP;
int returnValue;
Vfd *vfdP;
int returnValue;
DO_DB(printf("DEBUG: LruInsert %d (%s)\n",
file, VfdCache[file].fileName));
DO_DB(printf("DEBUG: LruInsert %d (%s)\n",
file, VfdCache[file].fileName));
vfdP = &VfdCache[file];
if (FileIsNotOpen(file)) {
int tmpfd;
int tmpfd;
/*
* Note, we check to see if there's a free file descriptor
* before attempting to open a file. One general way to do
* this is to try to open the null device which everybody
* should be able to open all the time. If this fails, we
* assume this is because there's no free file descriptors.
*/
* Note, we check to see if there's a free file descriptor
* before attempting to open a file. One general way to do
* this is to try to open the null device which everybody
* should be able to open all the time. If this fails, we
* assume this is because there's no free file descriptors.
*/
tryAgain:
tmpfd = open(Nulldev, O_CREAT|O_RDWR, 0666);
if (tmpfd < 0) {
FreeFd = 0;
errno = 0;
AssertLruRoom();
goto tryAgain;
} else {
close(tmpfd);
}
vfdP->fd = open(vfdP->fileName,vfdP->fileFlags,vfdP->fileMode);
if (vfdP->fd < 0) {
DO_DB(printf("RE_OPEN FAILED: %d\n",
errno));
return (vfdP->fd);
} else {
DO_DB(printf("RE_OPEN SUCCESS\n"));
++nfile;
}
/* seek to the right position */
if (vfdP->seekPos != 0L) {
returnValue =
lseek(vfdP->fd, vfdP->seekPos, SEEK_SET);
Assert(returnValue != -1);
}
/* init state on open */
vfdP->fdstate = 0x0;
/* note that a file descriptor has been used up */
if (FreeFd > 0)
FreeFd--;
tmpfd = open(Nulldev, O_CREAT|O_RDWR, 0666);
if (tmpfd < 0) {
FreeFd = 0;
errno = 0;
AssertLruRoom();
goto tryAgain;
} else {
close(tmpfd);
}
vfdP->fd = open(vfdP->fileName,vfdP->fileFlags,vfdP->fileMode);
if (vfdP->fd < 0) {
DO_DB(printf("RE_OPEN FAILED: %d\n",
errno));
return (vfdP->fd);
} else {
DO_DB(printf("RE_OPEN SUCCESS\n"));
++nfile;
}
/* seek to the right position */
if (vfdP->seekPos != 0L) {
returnValue =
lseek(vfdP->fd, vfdP->seekPos, SEEK_SET);
Assert(returnValue != -1);
}
/* init state on open */
vfdP->fdstate = 0x0;
/* note that a file descriptor has been used up */
if (FreeFd > 0)
FreeFd--;
}
/*
......@@ -369,69 +371,73 @@ LruInsert (File file)
static void
AssertLruRoom()
{
DO_DB(printf("DEBUG: AssertLruRoom (FreeFd = %d)\n",
FreeFd));
DO_DB(printf("DEBUG: AssertLruRoom (FreeFd = %d)\n",
FreeFd));
if (FreeFd <= 0 || nfile >= MAXFILES) {
LruDelete(VfdCache[0].lruMoreRecently);
/* We supposedly are using more vfds than we want to be. First
assert that there is at least one used vfd in the ring.
*/
Assert(VfdCache[0].lruMoreRecently ! 0);
LruDelete(VfdCache[0].lruMoreRecently);
}
}
static File
AllocateVfd()
{
Index i;
File file;
Index i;
File file;
DO_DB(printf("DEBUG: AllocateVfd\n"));
DO_DB(printf("DEBUG: AllocateVfd\n"));
if (SizeVfdCache == 0) {
/* initialize */
VfdCache = (Vfd *)malloc(sizeof(Vfd));
VfdCache->nextFree = 0;
VfdCache->lruMoreRecently = 0;
VfdCache->lruLessRecently = 0;
VfdCache->fd = VFD_CLOSED;
VfdCache->fdstate = 0x0;
SizeVfdCache = 1;
/* initialize */
VfdCache = (Vfd *)malloc(sizeof(Vfd));
VfdCache->nextFree = 0;
VfdCache->lruMoreRecently = 0;
VfdCache->lruLessRecently = 0;
VfdCache->fd = VFD_CLOSED;
VfdCache->fdstate = 0x0;
SizeVfdCache = 1;
}
if (VfdCache[0].nextFree == 0) {
/*
* The free list is empty so it is time to increase the
* size of the array
*/
VfdCache =(Vfd *)realloc(VfdCache, sizeof(Vfd)*SizeVfdCache*2);
Assert(VfdCache != NULL);
/*
* Set up the free list for the new entries
*/
for (i = SizeVfdCache; i < 2*SizeVfdCache; i++) {
memset((char *) &(VfdCache[i]), 0, sizeof(VfdCache[0]));
VfdCache[i].nextFree = i+1;
VfdCache[i].fd = VFD_CLOSED;
}
/*
* Element 0 is the first and last element of the free
* list
*/
VfdCache[0].nextFree = SizeVfdCache;
VfdCache[2*SizeVfdCache-1].nextFree = 0;
/*
* Record the new size
*/
SizeVfdCache *= 2;
/*
* The free list is empty so it is time to increase the
* size of the array
*/
VfdCache =(Vfd *)realloc(VfdCache, sizeof(Vfd)*SizeVfdCache*2);
Assert(VfdCache != NULL);
/*
* Set up the free list for the new entries
*/
for (i = SizeVfdCache; i < 2*SizeVfdCache; i++) {
memset((char *) &(VfdCache[i]), 0, sizeof(VfdCache[0]));
VfdCache[i].nextFree = i+1;
VfdCache[i].fd = VFD_CLOSED;
}
/*
* Element 0 is the first and last element of the free
* list
*/
VfdCache[0].nextFree = SizeVfdCache;
VfdCache[2*SizeVfdCache-1].nextFree = 0;
/*
* Record the new size
*/
SizeVfdCache *= 2;
}
file = VfdCache[0].nextFree;
......@@ -444,7 +450,7 @@ static void
FreeVfd(File file)
{
DO_DB(printf("DB: FreeVfd: %d (%s)\n",
file, VfdCache[file].fileName));
file, VfdCache[file].fileName));
VfdCache[file].nextFree = VfdCache[0].nextFree;
VfdCache[0].nextFree = file;
......@@ -461,19 +467,19 @@ filepath(char *filename)
if (*filename != Sep_char) {
#else
if (!(filename[1] == ':' && filename[2] == Sep_char)) {
#endif /* WIN32 */
#endif /* WIN32 */
/* Either /base/ or \base\ */
sprintf(basename, "%cbase%c", Sep_char, Sep_char);
/* Either /base/ or \base\ */
sprintf(basename, "%cbase%c", Sep_char, Sep_char);
len = strlen(DataDir) + strlen(basename) + strlen(GetDatabaseName())
+ strlen(filename) + 2;
buf = (char*) palloc(len);
sprintf(buf, "%s%s%s%c%s",
DataDir, basename, GetDatabaseName(), Sep_char, filename);
len = strlen(DataDir) + strlen(basename) + strlen(GetDatabaseName())
+ strlen(filename) + 2;
buf = (char*) palloc(len);
sprintf(buf, "%s%s%s%c%s",
DataDir, basename, GetDatabaseName(), Sep_char, filename);
} else {
buf = (char *) palloc(strlen(filename) + 1);
strcpy(buf, filename);
buf = (char *) palloc(strlen(filename) + 1);
strcpy(buf, filename);
}
return(buf);
......@@ -482,10 +488,10 @@ filepath(char *filename)
static int
FileAccess(File file)
{
int returnValue;
int returnValue;
DO_DB(printf("DB: FileAccess %d (%s)\n",
file, VfdCache[file].fileName));
file, VfdCache[file].fileName));
/*
* Is the file open? If not, close the least recently used,
......@@ -493,23 +499,23 @@ FileAccess(File file)
*/
if (FileIsNotOpen(file)) {
AssertLruRoom();
returnValue = LruInsert(file);
if (returnValue != 0)
return returnValue;
AssertLruRoom();
returnValue = LruInsert(file);
if (returnValue != 0)
return returnValue;
} else {
/*
* We now know that the file is open and that it is not the
* last one accessed, so we need to more it to the head of
* the Lru ring.
*/
Delete(file);
Insert(file);
/*
* We now know that the file is open and that it is not the
* last one accessed, so we need to more it to the head of
* the Lru ring.
*/
Delete(file);
Insert(file);
}
return (0);
......@@ -521,44 +527,45 @@ FileAccess(File file)
void
FileInvalidate(File file)
{
Assert(file > 0);
if (!FileIsNotOpen(file)) {
LruDelete(file);
LruDelete(file);
}
}
/* VARARGS2 */
static File
fileNameOpenFile(FileName fileName,
int fileFlags,
int fileMode)
int fileFlags,
int fileMode)
{
static int osRanOut = 0;
File file;
Vfd *vfdP;
File file;
Vfd *vfdP;
int tmpfd;
DO_DB(printf("DEBUG: FileNameOpenFile: %s %x %o\n",
fileName, fileFlags, fileMode));
fileName, fileFlags, fileMode));
file = AllocateVfd();
vfdP = &VfdCache[file];
if (nfile >= MAXFILES || (FreeFd == 0 && osRanOut)) {
AssertLruRoom();
AssertLruRoom();
}
tryAgain:
tmpfd = open(Nulldev, O_CREAT|O_RDWR, 0666);
if (tmpfd < 0) {
DO_DB(printf("DB: not enough descs, retry, er= %d\n",
errno));
errno = 0;
FreeFd = 0;
osRanOut = 1;
AssertLruRoom();
goto tryAgain;
DO_DB(printf("DB: not enough descs, retry, er= %d\n",
errno));
errno = 0;
FreeFd = 0;
osRanOut = 1;
AssertLruRoom();
goto tryAgain;
} else {
close(tmpfd);
close(tmpfd);
}
#ifdef WIN32
......@@ -568,17 +575,17 @@ fileNameOpenFile(FileName fileName,
vfdP->fdstate = 0x0;
if (vfdP->fd < 0) {
FreeVfd(file);
return -1;
FreeVfd(file);
return -1;
}
++nfile;
DO_DB(printf("DB: FNOF success %d\n",
vfdP->fd));
vfdP->fd));
(void)LruInsert(file);
if (fileName==NULL) {
elog(WARN, "fileNameOpenFile: NULL fname");
elog(WARN, "fileNameOpenFile: NULL fname");
}
vfdP->fileName = malloc(strlen(fileName)+1);
strcpy(vfdP->fileName,fileName);
......@@ -617,32 +624,32 @@ PathNameOpenFile(FileName fileName, int fileFlags, int fileMode)
void
FileClose(File file)
{
int returnValue;
int returnValue;
DO_DB(printf("DEBUG: FileClose: %d (%s)\n",
file, VfdCache[file].fileName));
file, VfdCache[file].fileName));
if (!FileIsNotOpen(file)) {
/* remove the file from the lru ring */
Delete(file);
/* record the new free operating system file descriptor */
FreeFd++;
/* if we did any writes, sync the file before closing */
if (VfdCache[file].fdstate & FD_DIRTY) {
returnValue = fsync(VfdCache[file].fd);
Assert(returnValue != -1);
VfdCache[file].fdstate &= ~FD_DIRTY;
}
/* close the file */
returnValue = close(VfdCache[file].fd);
Assert(returnValue != -1);
--nfile;
VfdCache[file].fd = VFD_CLOSED;
/* remove the file from the lru ring */
Delete(file);
/* record the new free operating system file descriptor */
FreeFd++;
/* if we did any writes, sync the file before closing */
if (VfdCache[file].fdstate & FD_DIRTY) {
returnValue = fsync(VfdCache[file].fd);
Assert(returnValue != -1);
VfdCache[file].fdstate &= ~FD_DIRTY;
}
/* close the file */
returnValue = close(VfdCache[file].fd);
Assert(returnValue != -1);
--nfile;
VfdCache[file].fd = VFD_CLOSED;
}
/*
* Add the Vfd slot to the free list
......@@ -660,29 +667,29 @@ FileUnlink(File file)
int returnValue;
DO_DB(printf("DB: FileClose: %d (%s)\n",
file, VfdCache[file].fileName));
file, VfdCache[file].fileName));
if (!FileIsNotOpen(file)) {
/* remove the file from the lru ring */
Delete(file);
/* record the new free operating system file descriptor */
FreeFd++;
/* if we did any writes, sync the file before closing */
if (VfdCache[file].fdstate & FD_DIRTY) {
returnValue = fsync(VfdCache[file].fd);
Assert(returnValue != -1);
VfdCache[file].fdstate &= ~FD_DIRTY;
}
/* close the file */
returnValue = close(VfdCache[file].fd);
Assert(returnValue != -1);
--nfile;
VfdCache[file].fd = VFD_CLOSED;
/* remove the file from the lru ring */
Delete(file);
/* record the new free operating system file descriptor */
FreeFd++;
/* if we did any writes, sync the file before closing */
if (VfdCache[file].fdstate & FD_DIRTY) {
returnValue = fsync(VfdCache[file].fd);
Assert(returnValue != -1);
VfdCache[file].fdstate &= ~FD_DIRTY;
}
/* close the file */
returnValue = close(VfdCache[file].fd);
Assert(returnValue != -1);
--nfile;
VfdCache[file].fd = VFD_CLOSED;
}
/* add the Vfd slot to the free list */
FreeVfd(file);
......@@ -695,15 +702,15 @@ FileUnlink(File file)
int
FileRead(File file, char *buffer, int amount)
{
int returnCode;
int returnCode;
DO_DB(printf("DEBUG: FileRead: %d (%s) %d 0x%x\n",
file, VfdCache[file].fileName, amount, buffer));
file, VfdCache[file].fileName, amount, buffer));
FileAccess(file);
returnCode = read(VfdCache[file].fd, buffer, amount);
if (returnCode > 0) {
VfdCache[file].seekPos += returnCode;
VfdCache[file].seekPos += returnCode;
}
return returnCode;
......@@ -712,15 +719,15 @@ FileRead(File file, char *buffer, int amount)
int
FileWrite(File file, char *buffer, int amount)
{
int returnCode;
int returnCode;
DO_DB(printf("DB: FileWrite: %d (%s) %d 0x%lx\n",
file, VfdCache[file].fileName, amount, buffer));
file, VfdCache[file].fileName, amount, buffer));
FileAccess(file);
returnCode = write(VfdCache[file].fd, buffer, amount);
if (returnCode > 0) { /* changed by Boris with Mao's advice */
VfdCache[file].seekPos += returnCode;
VfdCache[file].seekPos += returnCode;
}
/* record the write */
......@@ -732,32 +739,32 @@ FileWrite(File file, char *buffer, int amount)
long
FileSeek(File file, long offset, int whence)
{
int returnCode;
int returnCode;
DO_DB(printf("DEBUG: FileSeek: %d (%s) %d %d\n",
file, VfdCache[file].fileName, offset, whence));
file, VfdCache[file].fileName, offset, whence));
if (FileIsNotOpen(file)) {
switch(whence) {
case SEEK_SET:
VfdCache[file].seekPos = offset;
return offset;
case SEEK_CUR:
VfdCache[file].seekPos = VfdCache[file].seekPos +offset;
return VfdCache[file].seekPos;
case SEEK_END:
FileAccess(file);
returnCode = VfdCache[file].seekPos =
lseek(VfdCache[file].fd, offset, whence);
return returnCode;
default:
elog(WARN, "FileSeek: invalid whence: %d", whence);
break;
}
switch(whence) {
case SEEK_SET:
VfdCache[file].seekPos = offset;
return offset;
case SEEK_CUR:
VfdCache[file].seekPos = VfdCache[file].seekPos +offset;
return VfdCache[file].seekPos;
case SEEK_END:
FileAccess(file);
returnCode = VfdCache[file].seekPos =
lseek(VfdCache[file].fd, offset, whence);
return returnCode;
default:
elog(WARN, "FileSeek: invalid whence: %d", whence);
break;
}
} else {
returnCode = VfdCache[file].seekPos =
lseek(VfdCache[file].fd, offset, whence);
return returnCode;
returnCode = VfdCache[file].seekPos =
lseek(VfdCache[file].fd, offset, whence);
return returnCode;
}
/*NOTREACHED*/
return(-1L);
......@@ -770,7 +777,7 @@ long
FileTell(File file)
{
DO_DB(printf("DEBUG: FileTell %d (%s)\n",
file, VfdCache[file].fileName));
file, VfdCache[file].fileName));
return VfdCache[file].seekPos;
}
......@@ -780,7 +787,7 @@ FileTruncate(File file, int offset)
int returnCode;
DO_DB(printf("DEBUG: FileTruncate %d (%s)\n",
file, VfdCache[file].fileName));
file, VfdCache[file].fileName));
(void) FileSync(file);
(void) FileAccess(file);
......@@ -791,7 +798,7 @@ FileTruncate(File file, int offset)
int
FileSync(File file)
{
int returnCode;
int returnCode;
/*
* If the file isn't open, then we don't need to sync it; we
......@@ -801,10 +808,10 @@ FileSync(File file)
*/
if (VfdCache[file].fd < 0 || !(VfdCache[file].fdstate & FD_DIRTY)) {
returnCode = 0;
returnCode = 0;
} else {
returnCode = fsync(VfdCache[file].fd);
VfdCache[file].fdstate &= ~FD_DIRTY;
returnCode = fsync(VfdCache[file].fd);
VfdCache[file].fdstate &= ~FD_DIRTY;
}
return returnCode;
......@@ -840,24 +847,24 @@ AllocateFile()
int fdleft;
while ((fd = open(Nulldev,O_WRONLY,0)) < 0) {
if (errno == EMFILE) {
errno = 0;
FreeFd = 0;
AssertLruRoom();
} else {
elog(WARN,"Open: %s in %s line %d\n", Nulldev,
__FILE__, __LINE__);
}
if (errno == EMFILE) {
errno = 0;
FreeFd = 0;
AssertLruRoom();
} else {
elog(WARN,"Open: %s in %s line %d\n", Nulldev,
__FILE__, __LINE__);
}
}
close(fd);
++allocatedFiles;
fdleft = MAXFILES - allocatedFiles;
if (fdleft < 6) {
elog(DEBUG,"warning: few usable file descriptors left (%d)", fdleft);
elog(DEBUG,"warning: few usable file descriptors left (%d)", fdleft);
}
DO_DB(printf("DEBUG: AllocatedFile. FreeFd = %d\n",
FreeFd));
FreeFd));
}
/*
......@@ -868,9 +875,9 @@ void
FreeFile()
{
DO_DB(printf("DEBUG: FreeFile. FreeFd now %d\n",
FreeFd));
FreeFd));
FreeFd++;
nfile++; /* dangerous */
nfile++; /* dangerous */
Assert(allocatedFiles > 0);
--allocatedFiles;
}
......@@ -879,9 +886,10 @@ void
closeAllVfds()
{
int i;
for (i=0; i<SizeVfdCache; i++) {
if (!FileIsNotOpen(i))
LruDelete(i);
Assert (FileIsNotOpen(0)); /* Make sure ring not corrupted */
for (i=1; i<SizeVfdCache; i++) {
if (!FileIsNotOpen(i))
LruDelete(i);
}
}
......@@ -892,10 +900,10 @@ closeOneVfd()
tmpfd = open(Nulldev, O_CREAT | O_RDWR, 0666);
if (tmpfd < 0) {
FreeFd = 0;
AssertLruRoom();
FreeFd = 0;
FreeFd = 0;
AssertLruRoom();
FreeFd = 0;
}
else
close(tmpfd);
close(tmpfd);
}
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