linux/fs/partitions/ibm.c
Peter Oberparleiter cffab6bc55 [S390] dasd: use correct label location for diag fba disks
Partition boundary calculation fails for DASD FBA disks under the
following conditions:
- disk is formatted with CMS FORMAT with a blocksize of more than
  512 bytes
- all of the disk is reserved to a single CMS file using CMS RESERVE
- the disk is accessed using the DIAG mode of the DASD driver

Under these circumstances, the partition detection code tries to
read the CMS label block containing partition-relevant information
from logical block offset 1, while it is in fact located at physical
block offset 1.

Fix this problem by using the correct CMS label block location
depending on the device type as determined by the DASD SENSE ID
information.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2010-07-19 09:22:50 +02:00

271 lines
6.5 KiB
C

/*
* 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 sector_t
cchh2blk (struct vtoc_cchh *ptr, struct hd_geometry *geo) {
sector_t cyl;
__u16 head;
/*decode cylinder and heads for large volumes */
cyl = ptr->hh & 0xFFF0;
cyl <<= 12;
cyl |= ptr->cc;
head = ptr->hh & 0x000F;
return cyl * geo->heads * geo->sectors +
head * geo->sectors;
}
/*
* compute the block number from a
* cyl-cyl-head-head-block structure
*/
static sector_t
cchhb2blk (struct vtoc_cchhb *ptr, struct hd_geometry *geo) {
sector_t cyl;
__u16 head;
/*decode cylinder and heads for large volumes */
cyl = ptr->hh & 0xFFF0;
cyl <<= 12;
cyl |= ptr->cc;
head = ptr->hh & 0x000F;
return cyl * geo->heads * geo->sectors +
head * geo->sectors +
ptr->b;
}
/*
*/
int ibm_partition(struct parsed_partitions *state)
{
struct block_device *bdev = state->bdev;
int blocksize, res;
loff_t i_size, offset, size, fmt_size;
dasd_information2_t *info;
struct hd_geometry *geo;
char type[5] = {0,};
char name[7] = {0,};
union label_t {
struct vtoc_volume_label_cdl vol;
struct vtoc_volume_label_ldl lnx;
struct vtoc_cms_label cms;
} *label;
unsigned char *data;
Sector sect;
sector_t labelsect;
res = 0;
blocksize = bdev_logical_block_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;
/*
* Special case for FBA disks: label sector does not depend on
* blocksize.
*/
if ((info->cu_type == 0x6310 && info->dev_type == 0x9336) ||
(info->cu_type == 0x3880 && info->dev_type == 0x3370))
labelsect = info->label_block;
else
labelsect = info->label_block * (blocksize >> 9);
/*
* Get volume label, extract name and type.
*/
data = read_part_sector(state, labelsect, &sect);
if (data == NULL)
goto out_readerr;
memcpy(label, data, sizeof(union label_t));
put_dev_sector(sect);
if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) {
strncpy(type, label->vol.vollbl, 4);
strncpy(name, label->vol.volid, 6);
} else {
strncpy(type, label->lnx.vollbl, 4);
strncpy(name, label->lnx.volid, 6);
}
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
*/
blocksize = label->cms.block_size;
if (label->cms.disk_offset != 0) {
printk("CMS1/%8s(MDSK):", name);
/* disk is reserved minidisk */
offset = label->cms.disk_offset;
size = (label->cms.block_count - 1)
* (blocksize >> 9);
} else {
printk("CMS1/%8s:", name);
offset = (info->label_block + 1);
size = label->cms.block_count
* (blocksize >> 9);
}
put_partition(state, 1, offset*(blocksize >> 9),
size-offset*(blocksize >> 9));
} else {
if (strncmp(type, "LNX1", 4) == 0) {
printk("LNX1/%8s:", name);
if (label->lnx.ldl_version == 0xf2) {
fmt_size = label->lnx.formatted_blocks
* (blocksize >> 9);
} else if (!strcmp(info->type, "ECKD")) {
/* formated w/o large volume support */
fmt_size = geo->cylinders * geo->heads
* geo->sectors * (blocksize >> 9);
} else {
/* old label and no usable disk geometry
* (e.g. DIAG) */
fmt_size = i_size >> 9;
}
size = i_size >> 9;
if (fmt_size < size)
size = fmt_size;
offset = (info->label_block + 1);
} else {
/* unlabeled disk */
printk("(nonl)");
size = i_size >> 9;
offset = (info->label_block + 1);
}
put_partition(state, 1, offset*(blocksize >> 9),
size-offset*(blocksize >> 9));
}
} else if (info->format == DASD_FORMAT_CDL) {
/*
* New style CDL formatted disk
*/
sector_t 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_part_sector(state, blk * (blocksize/512),
&sect);
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']
|| f1.DS1FMTID == _ascebc['9']) {
blk++;
data = read_part_sector(state,
blk * (blocksize/512), &sect);
continue;
}
/* only FMT1 and 8 labels valid at this point */
if (f1.DS1FMTID != _ascebc['1'] &&
f1.DS1FMTID != _ascebc['8'])
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_part_sector(state,
blk * (blocksize/512), &sect);
}
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;
}