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DEFINITIONS
This source file includes following definitions.
- cchh2blk
- cchhb2blk
- ibm_partition
/*
* 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
*/
#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 (struct vtoc_cchh *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 (struct vtoc_cchhb *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,res;
loff_t i_size;
dasd_information2_t *info;
struct hd_geometry *geo;
char type[5] = {0,};
char name[7] = {0,};
union label_t {
struct vtoc_volume_label vol;
struct vtoc_cms_label cms;
} *label;
unsigned char *data;
Sector sect;
res = 0;
blocksize = bdev_hardsect_size(bdev);
if (blocksize <= 0)
goto out_exit;
i_size = i_size_read(bdev->bd_inode);
if (i_size == 0)
goto out_exit;
info = kmalloc(sizeof(dasd_information2_t), GFP_KERNEL);
if (info == NULL)
goto out_exit;
geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL);
if (geo == NULL)
goto out_nogeo;
label = kmalloc(sizeof(union label_t), GFP_KERNEL);
if (label == NULL)
goto out_nolab;
if (ioctl_by_bdev(bdev, BIODASDINFO2, (unsigned long)info) != 0 ||
ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
goto out_freeall;
/*
* 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(label, data, sizeof(union label_t));
put_dev_sector(sect);
EBCASC(type, 4);
EBCASC(name, 6);
res = 1;
/*
* Three different formats: LDL, CDL and unformated disk
*
* identified by info->format
*
* unformated disks we do not have to care about
*/
if (info->format == DASD_FORMAT_LDL) {
if (strncmp(type, "CMS1", 4) == 0) {
/*
* VM style CMS1 labeled disk
*/
if (label->cms.disk_offset != 0) {
printk("CMS1/%8s(MDSK):", name);
/* disk is reserved minidisk */
blocksize = label->cms.block_size;
offset = label->cms.disk_offset;
size = (label->cms.block_count - 1)
* (blocksize >> 9);
} else {
printk("CMS1/%8s:", name);
offset = (info->label_block + 1);
size = i_size >> 9;
}
} else {
/*
* Old style LNX1 or unlabeled disk
*/
if (strncmp(type, "LNX1", 4) == 0)
printk ("LNX1/%8s:", name);
else
printk("(nonl)");
offset = (info->label_block + 1);
size = i_size >> 9;
}
put_partition(state, 1, offset*(blocksize >> 9),
size-offset*(blocksize >> 9));
} else if (info->format == DASD_FORMAT_CDL) {
/*
* New style CDL formatted disk
*/
unsigned int blk;
int counter;
/*
* check if VOL1 label is available
* if not, something is wrong, skipping partition detection
*/
if (strncmp(type, "VOL1", 4) == 0) {
printk("VOL1/%8s:", name);
/*
* get block number and read then go through format1
* labels
*/
blk = cchhb2blk(&label->vol.vtoc, geo) + 1;
counter = 0;
data = read_dev_sector(bdev, blk * (blocksize/512),
§);
while (data != NULL) {
struct vtoc_format1_label f1;
memcpy(&f1, data,
sizeof(struct vtoc_format1_label));
put_dev_sector(sect);
/* skip FMT4 / FMT5 / FMT7 labels */
if (f1.DS1FMTID == _ascebc['4']
|| f1.DS1FMTID == _ascebc['5']
|| f1.DS1FMTID == _ascebc['7']) {
blk++;
data = read_dev_sector(bdev, blk *
(blocksize/512),
§);
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++;
data = read_dev_sector(bdev,
blk * (blocksize/512),
§);
}
if (!data)
/* Are we not supposed to report this ? */
goto out_readerr;
} else
printk(KERN_WARNING "Warning, expected Label VOL1 not "
"found, treating as CDL formated Disk");
}
printk("\n");
goto out_freeall;
out_readerr:
res = -1;
out_freeall:
kfree(label);
out_nolab:
kfree(geo);
out_nogeo:
kfree(info);
out_exit:
return res;
}