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/*
* Project: S.Ha.R.K.
*
* Coordinators:
* Giorgio Buttazzo <giorgio@sssup.it>
* Paolo Gai <pj@gandalf.sssup.it>
*
* Authors :
* Paolo Gai <pj@gandalf.sssup.it>
* Massimiliano Giorgi <massy@gandalf.sssup.it>
* Luca Abeni <luca@gandalf.sssup.it>
* (see the web pages for full authors list)
*
* ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
*
* http://www.sssup.it
* http://retis.sssup.it
* http://shark.sssup.it
*/
/***************************************
CVS : $Id: lodsk.c,v 1.1.1.1 2002-03-29 14:12:49 pj Exp $
Revision: $Revision: 1.1.1.1 $
Last update: $Date: 2002-03-29 14:12:49 $
This module is used by block device sub-system to scan a physical
hard disk to find logical layout (partition scheme).
***************************************/
/*
* Copyright (C) 1999 Massimiliano Giorgi
*
* 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "glue.h"
#include "bdev.h"
#include "sysind.h"
#include "lodsk.h"
/*+ Log Level used to report an error +*/
#define LODSKERRLOG KERN_ERR
/*+ Log level used to inform +*/
#define LODSKLOG KERN_NOTICE
/*+ An aligned buffer for data I/O +*/
static __uint8_t buffer
[512] __attribute__
((aligned
(4)));
/*++++++++++++++++++++++++++++++++++++++
This function convert a physical partion structure to a partition
structure (the difference is that the physical partition structure
has a "strange" layout and must be parsed to find actually values that
are saved into a partition structure).
struct phpartition *ph
physical partition to parse
struct partition *lo
values are stored into this structure
++++++++++++++++++++++++++++++++++++++*/
static void partph2lo
(struct phpartition
*ph
,struct partition
*lo
)
{
lo
->boot_ind
=((ph
->boot_ind
&0x80)?1:0);
lo
->sys_ind
=ph
->sys_ind
;
lo
->rel_sect
=ph
->rel_sect
;
lo
->nr_sects
=ph
->nr_sects
;
/**/
lo
->st_head
=ph
->st_h
;
lo
->st_sect
=ph
->st_s
&0x3f;
lo
->st_cyl
=(__uint16_t
)ph
->st_c
|(((__uint16_t
)ph
->st_s
&0xc0)<<2);
lo
->en_head
=ph
->st_h
;
lo
->en_sect
=ph
->en_s
&0x3f;
lo
->en_cyl
=(__uint16_t
)ph
->en_c
|(((__uint16_t
)ph
->en_s
&0xc0)<<2);
}
/*++++++++++++++++++++++++++++++++++++++
Find if a partition is an extended partition.
#define is_extended_partition
return 0 if no, other value if yes
sys_ind
"system indicator" for that partition
++++++++++++++++++++++++++++++++++++++*/
#define is_extended_partition(sys_ind) ( \
(sys_ind) == DOS_EXTENDED_PARTITION || \
(sys_ind) == WIN98_EXTENDED_PARTITION || \
(sys_ind) == LINUX_EXTENDED_PARTITION \
)
/*++++++++++++++++++++++++++++++++++++++
Scan recursiverly an extended partition to find other partition (this
function suppose an IBM PC hard disk architecture).
When a new partition is found the callback function is called.
int extended_partition
return 0 on success, other value on error
char *lname
it is the name of the physical disk; for informational purpose only
(for example "hda").
__dev_t device
it's the device to scan
lodsk_callback_func func
it's the callback function to call when a new partition is found
void *data
this is opaque data passed to the callback function
__blkcnt_t psect
is the starting block (sector) number for this extended partition
__blkcnt_t psize
is the size in blocks of this extended partition
int showinfo
show information with printk()
++++++++++++++++++++++++++++++++++++++*/
/* this routine is from Linux 2.2.9 (modificated to run into S.Ha.R.K.) */
static int extended_partition
(char *lname
, __dev_t device
,
lodsk_callback_func func
, void *data
,
__blkcnt_t psect
, __blkcnt_t psize
,
char *infobuffer
, int nextid
)
{
char name
[MAXLODSKNAME
];
struct phpartition
*ppar
;
struct partition lpar
;
struct lodskinfo info
;
__blkcnt_t stpsect
=psect
;
int ret
;
int i
;
int counter
=5;
int first
=1;
//if (phdsk_sectorsize(pdisk)!=512) return -1;
for (;;) {
//cprintf("reading block %li\n",(long)psect);
ret
=bdev_read
(device
,psect
,buffer
);
if (ret
) return -1;
//cprintf("read block %li\n",(long)psect);
if (*(__uint16_t
*)(buffer
+0x1fe)!=MSDOS_LABEL_MAGIC
) return -1;
//cprintf("ok sector\n");
ppar
=(struct phpartition
*)(buffer
+0x1be);
/*
* Usually, the first entry is the real data partition,
* the 2nd entry is the next extended partition, or empty,
* and the 3rd and 4th entries are unused.
* However, DRDOS sometimes has the extended partition as
* the first entry (when the data partition is empty),
* and OS/2 seems to use all four entries.
*/
/*
* First process the data partition(s)
*/
for (i
=0; i
<4; i
++, ppar
++) {
partph2lo
(ppar
,&lpar
);
/*
cprintf("-- %i --\n",i+x);
cprintf("c: %4i h: %4i s: %4i\n",lpar.st_cyl,lpar.st_head,lpar.st_sect);
cprintf("c: %4i h: %4i s: %4i\n",lpar.en_cyl,lpar.en_head,lpar.en_sect);
cprintf("sys: %02x relsec: %li num sect: %li\n",
lpar.sys_ind,lpar.rel_sect,lpar.nr_sects);
*/
if (!lpar.
nr_sects || is_extended_partition
(lpar.
sys_ind))
continue;
/* Check the 3rd and 4th entries -
these sometimes contain random garbage */
if (i
>= 2
&& lpar.
rel_sect + lpar.
nr_sects > psize
&& (psect
+ lpar.
rel_sect < psect
||
psect
+ lpar.
rel_sect + lpar.
nr_sects >
psect
+ psize
))
continue;
sprintf(name
,"%s%i ",lname
,counter
++);
info.
fs_ind=lpar.
sys_ind;
info.
start=psect
+lpar.
rel_sect;
info.
size=lpar.
nr_sects;
ret
=func
(nextid
++,&info
,data
);
if (infobuffer
!=NULL
&&first
) strcat(infobuffer
,"< ");
first
=0;
if (infobuffer
) strcat(infobuffer
,name
);
}
ppar
=(struct phpartition
*)(buffer
+0x1be);
/*
* Next, process the (first) extended partition, if present.
* (So far, there seems to be no reason to make
* extended_partition() recursive and allow a tree
* of extended partitions.)
* It should be a link to the next logical partition.
* Create a minor for this just long enough to get the next
* partition table. The minor will be reused for the next
* data partition.
*/
for (i
=0; i
<4; i
++, ppar
++)
if(ppar
->nr_sects
&& is_extended_partition
(ppar
->sys_ind
))
break;
if (i
== 4)
break; /* nothing left to do, go to the end*/
psect
=stpsect
+ppar
->rel_sect
;
psize
=ppar
->nr_sects
;
}
if (infobuffer
!=NULL
&&!first
) strcat(infobuffer
,"> ");
return nextid
;
}
//extern int ide_check_geometry(int pdisk, __uint8_t *buffer);
/*++++++++++++++++++++++++++++++++++++++
This function is called to scan a physical hard disk to find its logical
structure (IBM PC hard disk harchitecture is supposed).
int msdos_partition
return 0 on success, other value on error
char *lname
name to use if information is shown (for example "hdc")
__dev_t device
device to scan
lodsk_callback_func func
callback function to call when a partition is found
void *data
opaque data passed to the callback function
int showinfo
is true if informations will be displayed
++++++++++++++++++++++++++++++++++++++*/
/* this routine is from Linux 2.2.9 (modificated to run into S.Ha.R.K.) */
static int ibmpc_arch_scan
(char *lname
, __dev_t device
,
lodsk_callback_func func
,
void *data
, char *infobuffer
)
{
struct lodskinfo info
;
char name
[MAXLODSKNAME
];
struct phpartition
*ppar
;
struct partition lpar
;
int i
;
int ret
;
int nextid
;
ret
=bdev_read
(device
,0,buffer
);
if (ret
) {
cprintf
("XXXXXXXXXXXXXXXX");
return -1;
}
//if (phdsk_sectorsize(pdisk)!=512) return -1;
if (*(__uint16_t
*)(buffer
+0x1fe)!=MSDOS_LABEL_MAGIC
) return -1;
ppar
=(struct phpartition
*)(buffer
+0x1be);
nextid
=5;
for (i
=0;i
<4;i
++,ppar
+=1) {
partph2lo
(ppar
,&lpar
);
/*
cprintf("-- %i --\n",i);
cprintf("c: %4i h: %4i s: %4i\n",lpar.st_cyl,lpar.st_head,lpar.st_sect);
cprintf("c: %4i h: %4i s: %4i\n",lpar.en_cyl,lpar.en_head,lpar.en_sect);
cprintf("sys: %02x relsec: %li num sect: %li\n",
lpar.sys_ind,lpar.rel_sect,lpar.nr_sects);
*/
/*
if (phdsk[pdisk].ide_check_geom&&i==0) {
ide_check_geometry(pdisk,buffer);
}
*/
if (!lpar.
nr_sects) continue;
if (is_extended_partition
(lpar.
sys_ind)) {
nextid
=extended_partition
(lname
,device
,func
,data
,
lpar.
rel_sect,lpar.
nr_sects,infobuffer
,nextid
);
if (nextid
<0) return -1;
} else {
sprintf(name
,"%s%i ",lname
,i
+1);
info.
fs_ind=lpar.
sys_ind;
info.
start=lpar.
rel_sect;
info.
size=lpar.
nr_sects;
ret
=func
(i
+1,&info
,data
);
if (infobuffer
) strcat(infobuffer
,name
);
if (ret
) return 0;
}
}
return 0;
}
/*++++++++++++++++++++++++++++++++++++++
This function scan a physical hard disk for logical structure; actually
only IBM PC hard disk architecture is recognized.
int lodsk_scan
return 0 on success, other value on error
__dev_t device
device to scan
lodsk_callback_func func
callback function to call when a new partition is found
void *data
opaque data passed to the callback function
int showinfo
if information must be displayed
char *lname
logical name, for information only (example "hda")
++++++++++++++++++++++++++++++++++++++*/
int lodsk_scan
(__dev_t device
, lodsk_callback_func func
,
void *data
, int showinfo
, char *lname
)
{
char buffer
[1024]; /* DANGER!!! */
int ret
;
if (showinfo
) sprintf(buffer
,"%s: ",lname
);
ret
=ibmpc_arch_scan
(lname
,device
,func
,data
,showinfo
?buffer
:NULL
);
if (showinfo
) printk
(KERN_INFO
"%s",buffer
);
return ret
;
}