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/*
mdparse.c : Multiple Devices tools for Linux
Copyright (C) 1994-96 Marc ZYNGIER
<zyngier@ufr-info-p7.ibp.fr> or
<maz@gloups.fdn.fr>
This program 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, or (at your option)
any later version.
You should have received a copy of the GNU General Public License
(for example /usr/src/linux/COPYING); if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "common.h"
#include <limits.h>
#include <asm/page.h>
#define MAX_MD_ELEM 16
#define MDTAB_FILE "/etc/mdtab"
static FILE *tab=NULL;
void mdtab_open (void)
{
if (!(tab=fopen (MDTAB_FILE, "r")))
{
perror (MDTAB_FILE);
exit (EXIT_FAILURE);
}
}
int s2f (char *s)
{
int l, size, f, c, i;
if (!s || !(l=strlen (s)))
return 0;
size=atoi(s);
if (s[l-1]!='k')
return (size);
f=size >> (PAGE_SHIFT - 10);
for (i=1, c=0; i<size; i*=2)
if (f & i) c++;
if ((size*MD_BLK_SIZ) % PAGE_SIZE || c!=1)
{
fprintf (stderr, "Cannot handle %dk chunks. Defaulting to %dk\n",
size, 1 << (PAGE_SHIFT-10));
return (0);
}
for (i=0; !(f & (1 << i)); i++);
return (i);
}
char **parser (char *md_dev, int number,
int *personality, unsigned long **chksum)
{
int c, pos, len, count=0, i=1, x;
short factor=0, fault=0;
char line[256], dummy[256], options[256], sfactor[256];
static char *ent[MAX_MD_ELEM+1]; /* Max 9 dev/md */
static unsigned long chk;
if (!tab)
mdtab_open ();
rewind (tab);
while (!feof (tab))
{
/* Parse les espaces de debut */
fscanf (tab, " ");
/* Recherche de commentaires */
while ((c=fgetc (tab))=='#')
fscanf (tab, "%*[^\n] "); /* Ignore toute la fin de la ligne */
ungetc (c, tab);
if (feof (tab))
return NULL;
/* Parse la ligne complete
FIXME : Pas de ligne de plus de 255 caracteres */
fscanf (tab, "%255[^#\n]", line);
/* Parse le md_dev */
ent[0]=(char *) malloc (256);
sscanf (line, "%255[^ \t]%255[ \t]", ent[0], dummy);
count++;
if ((md_dev && strcmp (md_dev, ent[0])) ||
(!md_dev && count<number))
{
free (ent[0]);
continue;
}
len=strlen (line);
pos=strlen (ent[0])+strlen (dummy)+1;
sscanf (line+pos-1, "%255[^ \t]%255[ \t]", options, dummy);
pos+=strlen (options)+strlen (dummy);
x=sscanf (options, "%255[^,],%255[^,],%hd,%lx",
dummy, sfactor, &fault, &chk);
if (x<4)
*chksum=NULL;
else
*chksum=&chk;
factor=s2f (sfactor);
*personality=0;
if (!strcmp (dummy, "linear"))
*personality=LINEAR;
if (!strcmp (dummy, "stripped") || /* This spelling mistake will last... */
!strcmp (dummy, "striped") ||
!strcmp (dummy, "raid0"))
*personality=STRIPED | (factor & FACTOR_MASK);
if (!strcmp (dummy, "raid1"))
*personality=(RAID1 |
(factor & FACTOR_MASK) |
((fault << FAULT_SHIFT) & FAULT_MASK));
if (!strcmp (dummy, "raid5"))
*personality=(RAID5 |
(factor & FACTOR_MASK) |
((fault << FAULT_SHIFT) & FAULT_MASK));
if (!*personality)
{
fprintf (stderr, "Unknown option %s\n", options);
exit (EXIT_FAILURE);
}
while (pos<(len-1))
{
if (i<=MAX_MD_ELEM) {
ent[i]=(char *) malloc (256);
sscanf (line+pos-1, "%255[^ \t]%255[ \t]", ent[i], dummy);
pos+=strlen (ent[i])+strlen (dummy);
i++;
} else {
sscanf (line+pos-1, "%255[^ \t]", dummy);
printf ("Too many elements, ignoring %s\n", dummy);
pos+=strlen (dummy);
sscanf (line+pos-1, "%255[^ \t]", dummy);
pos+=strlen (dummy);
i++;
}
}
ent[i]=NULL;
return (ent);
}
return (NULL);
}
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