1. Cleanup (no more FreeFd - unuseful; others).

2. FreeFile() has to do nothing with nfile (# of files opened
   by VFD manager).

diff --git a/src/backend/storage/file/fd.c b/src/backend/storage/file/fd.c
index 9072f27..b037a0f 100644 (file)
--- a/src/backend/storage/file/fd.c
+++ b/src/backend/storage/file/fd.c
@@ -6,7 +6,7 @@
  * Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *    $Id: fd.c,v 1.16 1997/02/20 22:54:18 scrappy Exp $
+ *    $Id: fd.c,v 1.17 1997/05/22 16:51:19 vadim Exp $
  *
  * NOTES:
  *
@@ -120,11 +120,6 @@ static  Vfd     *VfdCache;
 static  Size    SizeVfdCache = 0;
 
 /*
- * Minimum number of file descriptors known to be free.
- */
-static  int     FreeFd = 0;
-
-/*
  * Number of file descriptors known to be open.
  */
 static  int     nfile = 0;
@@ -215,15 +210,17 @@ _dump_lru()
 {
     int mru = VfdCache[0].lruLessRecently;
     Vfd *vfdP = &VfdCache[mru];
+    char buf[2048];
     
-    printf("MOST %d ", mru);
+    sprintf(buf, "LRU: MOST %d ", mru);
     while (mru != 0)
-        {
-            mru = vfdP->lruLessRecently;
-            vfdP = &VfdCache[mru];
-            printf("%d ", mru);
-        }
-    printf("LEAST\n");
+    {
+       mru = vfdP->lruLessRecently;
+       vfdP = &VfdCache[mru];
+       sprintf (buf + strlen(buf), "%d ", mru);
+    }
+    sprintf(buf + strlen(buf), "LEAST");
+    elog (DEBUG, buf);
 }
 #endif /* FDDEBUG */
 
@@ -232,7 +229,7 @@ Delete(File file)
 {
     Vfd *fileP;
     
-    DO_DB(printf("DEBUG:        Delete %d (%s)\n",
+    DO_DB(elog (DEBUG, "Delete %d (%s)",
                  file, VfdCache[file].fileName));
     DO_DB(_dump_lru());
     
@@ -254,7 +251,7 @@ LruDelete(File file)
     Vfd     *fileP;
     int returnValue;
     
-    DO_DB(printf("DEBUG:        LruDelete %d (%s)\n",
+    DO_DB(elog (DEBUG, "LruDelete %d (%s)",
                  file, VfdCache[file].fileName));
     
     Assert(file != 0);
@@ -281,9 +278,7 @@ LruDelete(File file)
     
     --nfile;
     fileP->fd = VFD_CLOSED;
-    
-    /* note that there is now one more free real file descriptor */
-    FreeFd++;
+
 }
 
 static void
@@ -291,7 +286,7 @@ Insert(File file)
 {
     Vfd *vfdP;
     
-    DO_DB(printf("DEBUG:        Insert %d (%s)\n",
+    DO_DB(elog(DEBUG, "Insert %d (%s)",
                  file, VfdCache[file].fileName));
     DO_DB(_dump_lru());
     
@@ -311,13 +306,16 @@ LruInsert (File file)
     Vfd *vfdP;
     int returnValue;
     
-    DO_DB(printf("DEBUG:        LruInsert %d (%s)\n",
+    DO_DB(elog(DEBUG, "LruInsert %d (%s)",
                  file, VfdCache[file].fileName));
     
     vfdP = &VfdCache[file];
     
     if (FileIsNotOpen(file)) {
         int tmpfd;
+
+       if ( nfile >= pg_nofile() )
+            AssertLruRoom();
         
         /*
          * Note, we check to see if there's a free file descriptor
@@ -329,7 +327,6 @@ LruInsert (File file)
     tryAgain:
         tmpfd = open(Nulldev, O_CREAT|O_RDWR, 0666);
         if (tmpfd < 0) {
-            FreeFd = 0;
             errno = 0;
             AssertLruRoom();
             goto tryAgain;
@@ -339,11 +336,11 @@ LruInsert (File file)
         vfdP->fd = open(vfdP->fileName,vfdP->fileFlags,vfdP->fileMode);
         
         if (vfdP->fd < 0) {
-            DO_DB(printf("RE_OPEN FAILED: %d\n",
+            DO_DB(elog(DEBUG, "RE_OPEN FAILED: %d",
                          errno));
             return (vfdP->fd);
         } else {
-            DO_DB(printf("RE_OPEN SUCCESS\n"));
+            DO_DB(elog (DEBUG, "RE_OPEN SUCCESS"));
             ++nfile;
         }
         
@@ -357,9 +354,6 @@ LruInsert (File file)
         /* init state on open */
         vfdP->fdstate = 0x0;
         
-        /* note that a file descriptor has been used up */
-        if (FreeFd > 0)
-            FreeFd--;
     }
     
     /*
@@ -374,16 +368,16 @@ LruInsert (File file)
 static void
 AssertLruRoom()
 {
-    DO_DB(printf("DEBUG:        AssertLruRoom (FreeFd = %d)\n",
-                 FreeFd));
-    
-    if (FreeFd <= 0 || nfile >= pg_nofile()) {
-        /* 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);
-    }
+    DO_DB(elog(DEBUG, "AssertLruRoom. Opened %d", nfile));
+    
+    if ( nfile <= 0 )
+       elog (FATAL, "AssertLruRoom: No opened files - no one can be closed");
+    /* 
+     * There are opened files and so there should be at least one used vfd 
+     * in the ring. 
+     */
+    Assert(VfdCache[0].lruMoreRecently != 0);
+    LruDelete(VfdCache[0].lruMoreRecently);
 }
 
 static File
@@ -392,13 +386,12 @@ AllocateVfd()
     Index       i;
     File        file;
     
-    DO_DB(printf("DEBUG:        AllocateVfd\n"));
+    DO_DB(elog(DEBUG, "AllocateVfd. Size %d", SizeVfdCache));
     
     if (SizeVfdCache == 0) {
         
         /* initialize */
         VfdCache = (Vfd *)malloc(sizeof(Vfd));
-        
         VfdCache->nextFree = 0;
         VfdCache->lruMoreRecently = 0;
         VfdCache->lruLessRecently = 0;
@@ -408,8 +401,8 @@ AllocateVfd()
         SizeVfdCache = 1;
     }
     
-    if (VfdCache[0].nextFree == 0) {
-        
+    if (VfdCache[0].nextFree == 0)
+    {
         /*
          * The free list is empty so it is time to increase the
          * size of the array
@@ -417,7 +410,7 @@ AllocateVfd()
         
         VfdCache =(Vfd *)realloc(VfdCache, sizeof(Vfd)*SizeVfdCache*2);
         Assert(VfdCache != NULL);
-        
+
         /*
          * Set up the free list for the new entries
          */
@@ -452,7 +445,7 @@ AllocateVfd()
 static void
 FreeVfd(File file)
 {
-    DO_DB(printf("DB: FreeVfd: %d (%s)\n",
+    DO_DB(elog(DEBUG, "FreeVfd: %d (%s)",
                  file, VfdCache[file].fileName));
     
     VfdCache[file].nextFree = VfdCache[0].nextFree;
@@ -488,7 +481,7 @@ FileAccess(File file)
 {
     int returnValue;
     
-    DO_DB(printf("DB: FileAccess %d (%s)\n",
+    DO_DB(elog(DEBUG, "FileAccess %d (%s)",
                  file, VfdCache[file].fileName));
     
     /*
@@ -498,8 +491,6 @@ FileAccess(File file)
     
     if (FileIsNotOpen(file)) {
         
-        AssertLruRoom();
-        
         returnValue = LruInsert(file);
         if (returnValue != 0)
             return returnValue;
@@ -537,29 +528,25 @@ fileNameOpenFile(FileName fileName,
                  int fileFlags,
                  int fileMode)
 {
-    static int osRanOut = 0;
     File        file;
     Vfd *vfdP;
     int     tmpfd;
     
-    DO_DB(printf("DEBUG: FileNameOpenFile: %s %x %o\n",
+    DO_DB(elog(DEBUG, "fileNameOpenFile: %s %x %o",
                  fileName, fileFlags, fileMode));
     
     file = AllocateVfd();
     vfdP = &VfdCache[file];
     
-    if (nfile >= pg_nofile() || (FreeFd == 0 && osRanOut)) {
+    if ( nfile >= pg_nofile() )
         AssertLruRoom();
-    }
     
  tryAgain:
     tmpfd = open(Nulldev, O_CREAT|O_RDWR, 0666);
     if (tmpfd < 0) {
-        DO_DB(printf("DB: not enough descs, retry, er= %d\n",
+        DO_DB(elog(DEBUG, "fileNameOpenFile: not enough descs, retry, er= %d",
                      errno));
         errno = 0;
-        FreeFd = 0;
-        osRanOut = 1;
         AssertLruRoom();
         goto tryAgain;
     } else {
@@ -574,17 +561,17 @@ fileNameOpenFile(FileName fileName,
         return -1;
     }
     ++nfile;
-    DO_DB(printf("DB: FNOF success %d\n",
+    DO_DB(elog(DEBUG, "fileNameOpenFile: success %d",
                  vfdP->fd));
     
-    (void)LruInsert(file);
+    Insert(file);
     
     if (fileName==NULL) {
         elog(WARN, "fileNameOpenFile: NULL fname");
     }
     vfdP->fileName = malloc(strlen(fileName)+1);
     strcpy(vfdP->fileName,fileName);
-    
+
     vfdP->fileFlags = fileFlags & ~(O_TRUNC|O_EXCL);
     vfdP->fileMode = fileMode;
     vfdP->seekPos = 0;
@@ -621,7 +608,7 @@ FileClose(File file)
 {
     int returnValue;
     
-    DO_DB(printf("DEBUG: FileClose: %d (%s)\n",
+    DO_DB(elog(DEBUG, "FileClose: %d (%s)",
                  file, VfdCache[file].fileName));
     
     if (!FileIsNotOpen(file)) {
@@ -629,9 +616,6 @@ FileClose(File 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);
@@ -661,7 +645,7 @@ FileUnlink(File file)
 {
     int returnValue;
     
-    DO_DB(printf("DB: FileClose: %d (%s)\n",
+    DO_DB(elog(DEBUG, "FileUnlink: %d (%s)",
                  file, VfdCache[file].fileName));
     
     if (!FileIsNotOpen(file)) {
@@ -669,9 +653,6 @@ FileUnlink(File 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);
@@ -699,7 +680,7 @@ FileRead(File file, char *buffer, int amount)
 {
     int returnCode;
 
-    DO_DB(printf("DEBUG: FileRead: %d (%s) %d 0x%x\n",
+    DO_DB(elog(DEBUG, "FileRead: %d (%s) %d %p",
                  file, VfdCache[file].fileName, amount, buffer));
     
     FileAccess(file);
@@ -716,7 +697,7 @@ FileWrite(File file, char *buffer, int amount)
 {
     int returnCode;
 
-    DO_DB(printf("DB: FileWrite: %d (%s) %d 0x%lx\n",
+    DO_DB(elog(DEBUG, "FileWrite: %d (%s) %d %p",
                  file, VfdCache[file].fileName, amount, buffer));
     
     FileAccess(file);
@@ -736,7 +717,7 @@ FileSeek(File file, long offset, int whence)
 {
     int returnCode;
     
-    DO_DB(printf("DEBUG: FileSeek: %d (%s) %d %d\n",
+    DO_DB(elog (DEBUG, "FileSeek: %d (%s) %ld %d",
                  file, VfdCache[file].fileName, offset, whence));
     
     if (FileIsNotOpen(file)) {
@@ -771,7 +752,7 @@ FileSeek(File file, long offset, int whence)
 long
 FileTell(File file)
 {
-    DO_DB(printf("DEBUG: FileTell %d (%s)\n",
+    DO_DB(elog(DEBUG, "FileTell %d (%s)",
                  file, VfdCache[file].fileName));
     return VfdCache[file].seekPos;
 }
@@ -781,7 +762,7 @@ FileTruncate(File file, int offset)
 {
     int returnCode;
 
-    DO_DB(printf("DEBUG: FileTruncate %d (%s)\n",
+    DO_DB(elog(DEBUG, "FileTruncate %d (%s)",
                  file, VfdCache[file].fileName));
     
     (void) FileSync(file);
@@ -840,26 +821,25 @@ AllocateFile()
 {
     int fd;
     int fdleft;
+    
+    DO_DB(elog(DEBUG, "AllocateFile: Allocated %d.", allocatedFiles));
 
     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, %s\n", Nulldev,
+            elog(WARN,"Open: %s in %s line %d, %s", Nulldev,
                  __FILE__, __LINE__, strerror(errno));
         }
     }
     close(fd);
     ++allocatedFiles;
-    fdleft = pg_nofile() - allocatedFiles;
+    fdleft = pg_nofile() - allocatedFiles - nfile;
     if (fdleft < 6) {
-        elog(DEBUG,"warning: few usable file descriptors left (%d)", fdleft);
+        elog(NOTICE,"warning: few usable file descriptors left (%d)", fdleft);
     }
-    
-    DO_DB(printf("DEBUG: AllocatedFile.  FreeFd = %d\n",
-                 FreeFd));
+
 }
 
 /*
@@ -869,10 +849,8 @@ AllocateFile()
 void
 FreeFile()
 {
-    DO_DB(printf("DEBUG: FreeFile.  FreeFd now %d\n",
-                 FreeFd));
-    FreeFd++;
-    nfile++;                    /* dangerous */
+    DO_DB(elog(DEBUG, "FreeFile: Allocated %d.", allocatedFiles));
+
     Assert(allocatedFiles > 0);
     --allocatedFiles;
 }
@@ -894,11 +872,8 @@ closeOneVfd()
     int tmpfd;
     
     tmpfd = open(Nulldev, O_CREAT | O_RDWR, 0666);
-    if (tmpfd < 0) {
-        FreeFd = 0;
+    if (tmpfd < 0)
         AssertLruRoom();
-        FreeFd = 0;
-    }
     else
         close(tmpfd);
 }