271 строка
6.5 KiB
C
271 строка
6.5 KiB
C
/*
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* File...........: linux/fs/partitions/ibm.c
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* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
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* Volker Sameske <sameske@de.ibm.com>
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* Bugreports.to..: <Linux390@de.ibm.com>
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* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
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*/
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#include <linux/buffer_head.h>
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#include <linux/hdreg.h>
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#include <linux/slab.h>
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#include <asm/dasd.h>
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#include <asm/ebcdic.h>
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#include <asm/uaccess.h>
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#include <asm/vtoc.h>
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#include "check.h"
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#include "ibm.h"
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/*
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* compute the block number from a
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* cyl-cyl-head-head structure
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*/
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static sector_t
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cchh2blk (struct vtoc_cchh *ptr, struct hd_geometry *geo) {
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sector_t cyl;
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__u16 head;
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/*decode cylinder and heads for large volumes */
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cyl = ptr->hh & 0xFFF0;
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cyl <<= 12;
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cyl |= ptr->cc;
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head = ptr->hh & 0x000F;
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return cyl * geo->heads * geo->sectors +
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head * geo->sectors;
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}
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/*
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* compute the block number from a
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* cyl-cyl-head-head-block structure
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*/
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static sector_t
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cchhb2blk (struct vtoc_cchhb *ptr, struct hd_geometry *geo) {
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sector_t cyl;
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__u16 head;
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/*decode cylinder and heads for large volumes */
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cyl = ptr->hh & 0xFFF0;
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cyl <<= 12;
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cyl |= ptr->cc;
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head = ptr->hh & 0x000F;
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return cyl * geo->heads * geo->sectors +
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head * geo->sectors +
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ptr->b;
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}
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/*
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*/
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int ibm_partition(struct parsed_partitions *state)
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{
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struct block_device *bdev = state->bdev;
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int blocksize, res;
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loff_t i_size, offset, size, fmt_size;
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dasd_information2_t *info;
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struct hd_geometry *geo;
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char type[5] = {0,};
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char name[7] = {0,};
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union label_t {
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struct vtoc_volume_label_cdl vol;
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struct vtoc_volume_label_ldl lnx;
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struct vtoc_cms_label cms;
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} *label;
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unsigned char *data;
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Sector sect;
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sector_t labelsect;
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res = 0;
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blocksize = bdev_logical_block_size(bdev);
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if (blocksize <= 0)
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goto out_exit;
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i_size = i_size_read(bdev->bd_inode);
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if (i_size == 0)
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goto out_exit;
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info = kmalloc(sizeof(dasd_information2_t), GFP_KERNEL);
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if (info == NULL)
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goto out_exit;
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geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL);
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if (geo == NULL)
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goto out_nogeo;
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label = kmalloc(sizeof(union label_t), GFP_KERNEL);
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if (label == NULL)
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goto out_nolab;
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if (ioctl_by_bdev(bdev, BIODASDINFO2, (unsigned long)info) != 0 ||
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ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
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goto out_freeall;
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/*
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* Special case for FBA disks: label sector does not depend on
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* blocksize.
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*/
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if ((info->cu_type == 0x6310 && info->dev_type == 0x9336) ||
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(info->cu_type == 0x3880 && info->dev_type == 0x3370))
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labelsect = info->label_block;
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else
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labelsect = info->label_block * (blocksize >> 9);
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/*
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* Get volume label, extract name and type.
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*/
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data = read_part_sector(state, labelsect, §);
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if (data == NULL)
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goto out_readerr;
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memcpy(label, data, sizeof(union label_t));
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put_dev_sector(sect);
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if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) {
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strncpy(type, label->vol.vollbl, 4);
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strncpy(name, label->vol.volid, 6);
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} else {
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strncpy(type, label->lnx.vollbl, 4);
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strncpy(name, label->lnx.volid, 6);
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}
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EBCASC(type, 4);
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EBCASC(name, 6);
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res = 1;
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/*
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* Three different formats: LDL, CDL and unformated disk
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*
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* identified by info->format
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*
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* unformated disks we do not have to care about
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*/
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if (info->format == DASD_FORMAT_LDL) {
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if (strncmp(type, "CMS1", 4) == 0) {
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/*
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* VM style CMS1 labeled disk
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*/
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blocksize = label->cms.block_size;
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if (label->cms.disk_offset != 0) {
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printk("CMS1/%8s(MDSK):", name);
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/* disk is reserved minidisk */
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offset = label->cms.disk_offset;
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size = (label->cms.block_count - 1)
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* (blocksize >> 9);
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} else {
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printk("CMS1/%8s:", name);
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offset = (info->label_block + 1);
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size = label->cms.block_count
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* (blocksize >> 9);
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}
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put_partition(state, 1, offset*(blocksize >> 9),
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size-offset*(blocksize >> 9));
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} else {
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if (strncmp(type, "LNX1", 4) == 0) {
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printk("LNX1/%8s:", name);
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if (label->lnx.ldl_version == 0xf2) {
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fmt_size = label->lnx.formatted_blocks
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* (blocksize >> 9);
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} else if (!strcmp(info->type, "ECKD")) {
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/* formated w/o large volume support */
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fmt_size = geo->cylinders * geo->heads
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* geo->sectors * (blocksize >> 9);
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} else {
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/* old label and no usable disk geometry
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* (e.g. DIAG) */
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fmt_size = i_size >> 9;
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}
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size = i_size >> 9;
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if (fmt_size < size)
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size = fmt_size;
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offset = (info->label_block + 1);
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} else {
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/* unlabeled disk */
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printk("(nonl)");
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size = i_size >> 9;
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offset = (info->label_block + 1);
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}
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put_partition(state, 1, offset*(blocksize >> 9),
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size-offset*(blocksize >> 9));
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}
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} else if (info->format == DASD_FORMAT_CDL) {
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/*
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* New style CDL formatted disk
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*/
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sector_t blk;
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int counter;
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/*
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* check if VOL1 label is available
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* if not, something is wrong, skipping partition detection
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*/
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if (strncmp(type, "VOL1", 4) == 0) {
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printk("VOL1/%8s:", name);
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/*
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* get block number and read then go through format1
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* labels
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*/
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blk = cchhb2blk(&label->vol.vtoc, geo) + 1;
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counter = 0;
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data = read_part_sector(state, blk * (blocksize/512),
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§);
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while (data != NULL) {
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struct vtoc_format1_label f1;
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memcpy(&f1, data,
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sizeof(struct vtoc_format1_label));
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put_dev_sector(sect);
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/* skip FMT4 / FMT5 / FMT7 labels */
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if (f1.DS1FMTID == _ascebc['4']
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|| f1.DS1FMTID == _ascebc['5']
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|| f1.DS1FMTID == _ascebc['7']
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|| f1.DS1FMTID == _ascebc['9']) {
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blk++;
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data = read_part_sector(state,
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blk * (blocksize/512), §);
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continue;
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}
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/* only FMT1 and 8 labels valid at this point */
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if (f1.DS1FMTID != _ascebc['1'] &&
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f1.DS1FMTID != _ascebc['8'])
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break;
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/* OK, we got valid partition data */
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offset = cchh2blk(&f1.DS1EXT1.llimit, geo);
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size = cchh2blk(&f1.DS1EXT1.ulimit, geo) -
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offset + geo->sectors;
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if (counter >= state->limit)
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break;
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put_partition(state, counter + 1,
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offset * (blocksize >> 9),
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size * (blocksize >> 9));
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counter++;
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blk++;
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data = read_part_sector(state,
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blk * (blocksize/512), §);
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}
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if (!data)
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/* Are we not supposed to report this ? */
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goto out_readerr;
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} else
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printk(KERN_WARNING "Warning, expected Label VOL1 not "
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"found, treating as CDL formated Disk");
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}
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printk("\n");
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goto out_freeall;
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out_readerr:
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res = -1;
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out_freeall:
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kfree(label);
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out_nolab:
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kfree(geo);
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out_nogeo:
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kfree(info);
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out_exit:
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return res;
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}
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