Cambios Realizados (son varios, read carefuly):

[z.facultad/75.06/emufs.git] / emufs / fsc.c

diff --git a/emufs/fsc.c b/emufs/fsc.c
index b8e0db4b7101042407387f9c97f3ea2334ad8edc..1cf873f481b9981df215fc06bcedb6520e36e4db 100644 (file)
--- a/emufs/fsc.c
+++ b/emufs/fsc.c
@@ -1,45 +1,145 @@
+/* vim: set noexpandtab tabstop=4 shiftwidth=4:
+ *----------------------------------------------------------------------------
+ *                                  emufs
+ *----------------------------------------------------------------------------
+ * This file is part of emufs.
+ *
+ * emufs is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ *
+ * emufs is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with emufs; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place, Suite 330, Boston, MA  02111-1307  USA
+ *----------------------------------------------------------------------------
+ * Creado:  vie abr  9 16:17:50 ART 2004
+ * Autores: Nicolás Dimov <sagardua@uolsinectis.com.ar>
+ *          Leandro Lucarella <llucare@fi.uba.ar>
+ *----------------------------------------------------------------------------
+ *
+ * $Id$
+ *
+ */
+
+/** \file
+ *
+ * Archivo para administrar el espacio libre disponible.
+ * 
+ * Implementación del archivo para administrar el espacio libre disponible.
+ *
+ */
+

 #include "fsc.h"
 #include "fsc.h"

-#include "tipo3.h"
+#include <string.h>
+#include <unistd.h>
+
+/* Crea un archivo de Gaps o Espacio Libre en Bloque */
+int emufs_fsc_crear(EMUFS* efs)
+{
+       return emufs_crear_archivo_auxiliar(efs->nombre, EMUFS_FSC_EXT);
+}

 
 

-int emufs_fsc_agregar(EMUFS *emu, int num_bloque, int fs)
+/* Agrega un registro al archivo de espacios libres. */
+int emufs_fsc_agregar(EMUFS *emu, EMUFS_BLOCK_ID n_Marker, EMUFS_FREE n_FreeSpace)

 {
        FILE *f_fsc;
 {
        FILE *f_fsc;

-       BLOCK_FREE_T reg;
+       EMUFS_FSC reg;

        char name_f_fsc[255];
        
        strcpy(name_f_fsc,emu->nombre);
        char name_f_fsc[255];
        
        strcpy(name_f_fsc,emu->nombre);

-       strcat(name_f_fsc,".fsc");
+       strcat(name_f_fsc, EMUFS_FSC_EXT);

        
        

-       /*cargo el registro*/
-       reg.block = num_bloque; /*no incremento cant, porque grabe el nuevo bloque antes y no lo conte!!*/
-       reg.free_space = fs;
-       /*lo guardo en el archivo al final  "a+"*/
+       /* Cargo el registro */
+       reg.n_Marker = n_Marker;
+       reg.n_FreeSpace = n_FreeSpace;
+
+       /* Lo guardo en el archivo al final "a+"*/

        if ( (f_fsc = fopen(name_f_fsc,"a+"))==NULL ) return -1;
        if ( (f_fsc = fopen(name_f_fsc,"a+"))==NULL ) return -1;

-       fwrite(&reg,sizeof(BLOCK_FREE_T),1,f_fsc);
+       fwrite(&reg,sizeof(EMUFS_FSC),1,f_fsc);

        fclose(f_fsc);
        return 0;
 }
 
        fclose(f_fsc);
        return 0;
 }
 

-int emufs_fsc_actualizar(EMUFS *emu, int num_bloque, int fs)
+/* Objetivo: Actualiza un registro de espacio libre de acorde al FType */
+int emufs_fsc_actualizar(EMUFS *emu, EMUFS_BLOCK_ID n_Marker, EMUFS_FREE n_FreeSpace)

 {
        FILE *f_fsc;
 {
        FILE *f_fsc;

-       BLOCK_FREE_T reg;
+       EMUFS_FSC reg;

        char name_f_fsc[255];
        
        strcpy(name_f_fsc,emu->nombre);
        char name_f_fsc[255];
        
        strcpy(name_f_fsc,emu->nombre);

-       strcat(name_f_fsc,".fsc");
+       strcat(name_f_fsc, EMUFS_FSC_EXT);

 
 

-       /*busco el bloque que modifique*/
-       if ( (f_fsc = fopen(name_f_fsc,"r+")) == NULL) return -1; 
+       /*busco el bloque o gap que modifique*/
+    if ( (f_fsc = fopen(name_f_fsc,"r+")) == NULL) return -1; 

        while ( !feof(f_fsc) ){
        while ( !feof(f_fsc) ){

-               if ( fread(&reg,sizeof(BLOCK_FREE_T),1,f_fsc) != 1) continue;
-               if ( reg.block == num_bloque ){
-                       reg.free_space -= fs;
-                       fseek(f_fsc,-sizeof(BLOCK_FREE_T),SEEK_CUR);
-                       fwrite(&reg,sizeof(BLOCK_FREE_T),1,f_fsc);
+               if ( fread(&reg,sizeof(EMUFS_FSC),1,f_fsc) != 1) continue;
+               if ( reg.n_Marker == n_Marker ){
+                       reg.n_FreeSpace = n_FreeSpace;
+                       fseek(f_fsc,-sizeof(EMUFS_FSC),SEEK_CUR);
+                       fwrite(&reg,sizeof(EMUFS_FSC),1,f_fsc);

                        break;
                }
        }
        fclose(f_fsc);
        return 0;
 }
                        break;
                }
        }
        fclose(f_fsc);
        return 0;
 }

+
+/* Me devuelve el ID del bloque u Offset del Gap donde quepa un registro, y guarda en n_FreeSpace el espacio libre actualizado */
+EMUFS_BLOCK_ID emufs_fsc_buscar_lugar(EMUFS *emu, EMUFS_FREE n_RegSize, EMUFS_FREE *n_FreeSpace)
+{
+       FILE *f_fsc;
+       EMUFS_FSC reg;
+       char name_f_fsc[255];
+       unsigned short int b_Found = 0;
+       
+       strcpy(name_f_fsc,emu->nombre);
+       strcat(name_f_fsc, EMUFS_FSC_EXT);
+
+       if ( (f_fsc = fopen(name_f_fsc,"r"))==NULL ) return -1;
+
+       /* Inicializamos la estructura para devolver algun valor en concreto */
+       /* en caso de que no se halle un espacio libre apropiado */
+       while(!feof(f_fsc) && !b_Found){
+               if (fread(&reg,sizeof(EMUFS_FSC),1,f_fsc) != 1) continue;
+               if (reg.n_FreeSpace >= n_RegSize) b_Found = 1;
+       }
+       
+       /* Si salio por error o por fin de archivo y no encontro space... */
+       if (!b_Found) {
+         reg.n_Marker = -1;
+         *n_FreeSpace = emu->tam_bloque; 
+       }
+       else *n_FreeSpace = reg.n_FreeSpace;
+       
+       fclose(f_fsc);
+       return reg.n_Marker;
+}
+
+/* Devuelve el espacio libre de un Bloque o Gap dado */
+EMUFS_FREE emufs_fsc_get_fs(EMUFS *emu, EMUFS_BLOCK_ID n_Marker)
+{
+       FILE *f_fsc;
+       EMUFS_FSC reg;
+       char name_f_fsc[255];
+       
+       strcpy(name_f_fsc,emu->nombre);
+       strcat(name_f_fsc, EMUFS_FSC_EXT);
+
+       /* Busco el Bloque o Gap pedido y obtengo su espacio libre */
+       if ( (f_fsc = fopen(name_f_fsc,"r"))==NULL ) return -1;
+       while ( !feof(f_fsc) ){
+               if ( fread(&reg,sizeof(EMUFS_FSC),1,f_fsc) != 1 ) continue;
+               if ( reg.n_Marker == n_Marker )
+                       break;
+       }
+               
+       fclose(f_fsc);
+       return reg.n_FreeSpace;
+}