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/*
* File...........: linux/fs/partitions/ibm.c
* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
* Volker Sameske <sameske@de.ibm.com>
* Bugreports.to..: <Linux390@de.ibm.com>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
* History of changes (starts July 2000)
* 07/10/00 Fixed detection of CMS formatted disks
* 02/13/00 VTOC partition support added
* 12/27/01 fixed PL030593 (CMS reserved minidisk not detected on 64 bit)
* 07/24/03 no longer using contents of freed page for CMS label recognition (BZ3611)
*/
#include <linux/config.h>
#include <linux/buffer_head.h>
#include <linux/hdreg.h>
#include <linux/slab.h>
#include <asm/dasd.h>
#include <asm/ebcdic.h>
#include <asm/uaccess.h>
#include <asm/vtoc.h>
#include "check.h"
#include "ibm.h"
/*
* compute the block number from a
* cyl-cyl-head-head structure
*/
static inline int
cchh2blk (cchh_t *ptr, struct hd_geometry *geo) {
return ptr->cc * geo->heads * geo->sectors +
ptr->hh * geo->sectors;
}
/*
* compute the block number from a
* cyl-cyl-head-head-block structure
*/
static inline int
cchhb2blk (cchhb_t *ptr, struct hd_geometry *geo) {
return ptr->cc * geo->heads * geo->sectors +
ptr->hh * geo->sectors +
ptr->b;
}
/*
*/
int
ibm_partition(struct parsed_partitions *state, struct block_device *bdev)
{
int blocksize, offset, size;
dasd_information_t *info;
struct hd_geometry *geo;
char type[5] = {0,};
char name[7] = {0,};
volume_label_t *vlabel;
unsigned char *data;
Sector sect;
if ((info = kmalloc(sizeof(dasd_information_t), GFP_KERNEL)) == NULL)
goto out_noinfo;
if ((geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL)) == NULL)
goto out_nogeo;
if ((vlabel = kmalloc(sizeof(volume_label_t), GFP_KERNEL)) == NULL)
goto out_novlab;
if (ioctl_by_bdev(bdev, BIODASDINFO, (unsigned long)info) != 0 ||
ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
goto out_noioctl;
if ((blocksize = bdev_hardsect_size(bdev)) <= 0)
goto out_badsect;
/*
* Get volume label, extract name and type.
*/
data = read_dev_sector(bdev, info->label_block*(blocksize/512), §);
if (data == NULL)
goto out_readerr;
strncpy (type, data, 4);
if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD")))
strncpy(name, data + 8, 6);
else
strncpy(name, data + 4, 6);
memcpy (vlabel, data, sizeof(volume_label_t));
put_dev_sector(sect);
EBCASC(type, 4);
EBCASC(name, 6);
/*
* Three different types: CMS1, VOL1 and LNX1/unlabeled
*/
if (strncmp(type, "CMS1", 4) == 0) {
/*
* VM style CMS1 labeled disk
*/
int *label = (int *) vlabel;
if (label[13] != 0) {
printk("CMS1/%8s(MDSK):", name);
/* disk is reserved minidisk */
blocksize = label[3];
offset = label[13];
size = (label[7] - 1)*(blocksize >> 9);
} else {
printk("CMS1/%8s:", name);
offset = (info->label_block + 1);
size = bdev->bd_inode->i_size >> 9;
}
put_partition(state, 1, offset*(blocksize >> 9),
size-offset*(blocksize >> 9));
} else if ((strncmp(type, "VOL1", 4) == 0) &&
(!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) {
/*
* New style VOL1 labeled disk
*/
unsigned int blk;
int counter;
printk("VOL1/%8s:", name);
/* get block number and read then go through format1 labels */
blk = cchhb2blk(&vlabel->vtoc, geo) + 1;
counter = 0;
while ((data = read_dev_sector(bdev, blk*(blocksize/512),
§)) != NULL) {
format1_label_t f1;
memcpy(&f1, data, sizeof(format1_label_t));
put_dev_sector(sect);
/* skip FMT4 / FMT5 / FMT7 labels */
if (f1.DS1FMTID == _ascebc['4']
|| f1.DS1FMTID == _ascebc['5']
|| f1.DS1FMTID == _ascebc['7']) {
blk++;
continue;
}
/* only FMT1 valid at this point */
if (f1.DS1FMTID != _ascebc['1'])
break;
/* OK, we got valid partition data */
offset = cchh2blk(&f1.DS1EXT1.llimit, geo);
size = cchh2blk(&f1.DS1EXT1.ulimit, geo) -
offset + geo->sectors;
if (counter >= state->limit)
break;
put_partition(state, counter + 1,
offset * (blocksize >> 9),
size * (blocksize >> 9));
counter++;
blk++;
}
} else {
/*
* Old style LNX1 or unlabeled disk
*/
if (strncmp(type, "LNX1", 4) == 0)
printk ("LNX1/%8s:", name);
else
printk("(nonl)/%8s:", name);
offset = (info->label_block + 1);
size = (bdev->bd_inode->i_size >> 9);
put_partition(state, 1, offset*(blocksize >> 9),
size-offset*(blocksize >> 9));
}
printk("\n");
kfree(vlabel);
kfree(geo);
kfree(info);
return 1;
out_readerr:
out_badsect:
out_noioctl:
kfree(vlabel);
out_novlab:
kfree(geo);
out_nogeo:
kfree(info);
out_noinfo:
return 0;
}
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