repair/io.c

   1 /*
   2  * Copyright (c) 2000-2002 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32
  33 #include <libxfs.h>
  34 #include "globals.h"
  35 #include "agheader.h"
  36 #include "protos.h"
  37 #include "err_protos.h"
  38
  39 void
  40 io_init(void)
  41 {
  42         int i;
  43
  44         /* open up filesystem device */
  45
  46         ASSERT(fs_name != NULL && *fs_name != '\0');
  47
  48         if ((fs_fd = open (fs_name, (no_modify? O_RDONLY : O_RDWR))) < 0)  {
  49                 do_error("couldn't open filesystem \"%s\"\n",
  50                          fs_name);
  51         }
  52
  53         /* initialize i/o buffers */
  54
  55         iobuf_size = 1000 * 1024;
  56         smallbuf_size = 4 * 4096;       /* enough for an ag */
  57
  58         /*
  59          * sbbuf_size must be < XFS_MIN_AG_BLOCKS (64) * smallest block size,
  60          * otherwise you might get an EOF when reading in the sb/agf from
  61          * the last ag if that ag is small
  62          */
  63         sbbuf_size = 2 * 4096;          /* 2 * max sector size */
  64
  65         if ((iobuf = malloc(iobuf_size)) == NULL)
  66                 do_error("couldn't malloc io buffer\n");
  67
  68         if ((smallbuf = malloc(smallbuf_size)) == NULL)
  69                 do_error("couldn't malloc secondary io buffer\n");
  70
  71         for (i = 0; i < NUM_SBS; i++)  {
  72                 if ((sb_bufs[i] = malloc(sbbuf_size)) == NULL)
  73                         do_error("couldn't malloc sb io buffers\n");
  74         }
  75 }