377 lines
9.7 KiB
C
377 lines
9.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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* Copyright IBM Corp. 1999, 2012
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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 <linux/uaccess.h>
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#include <asm/vtoc.h>
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#include <linux/module.h>
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#include <linux/dasd_mod.h>
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#include "check.h"
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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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};
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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 cchh2blk(struct vtoc_cchh *ptr, struct hd_geometry *geo)
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{
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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 cchhb2blk(struct vtoc_cchhb *ptr, struct hd_geometry *geo)
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{
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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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static int find_label(struct parsed_partitions *state,
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dasd_information2_t *info,
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struct hd_geometry *geo,
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int blocksize,
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sector_t *labelsect,
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char name[],
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char type[],
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union label_t *label)
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{
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Sector sect;
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unsigned char *data;
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sector_t testsect[3];
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unsigned char temp[5];
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int found = 0;
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int i, testcount;
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/* There a three places where we may find a valid label:
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* - on an ECKD disk it's block 2
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* - on an FBA disk it's block 1
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* - on an CMS formatted FBA disk it is sector 1, even if the block size
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* is larger than 512 bytes (possible if the DIAG discipline is used)
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* If we have a valid info structure, then we know exactly which case we
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* have, otherwise we just search through all possebilities.
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*/
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if (info) {
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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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testsect[0] = info->label_block;
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else
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testsect[0] = info->label_block * (blocksize >> 9);
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testcount = 1;
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} else {
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testsect[0] = 1;
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testsect[1] = (blocksize >> 9);
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testsect[2] = 2 * (blocksize >> 9);
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testcount = 3;
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}
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for (i = 0; i < testcount; ++i) {
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data = read_part_sector(state, testsect[i], §);
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if (data == NULL)
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continue;
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memcpy(label, data, sizeof(*label));
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memcpy(temp, data, 4);
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temp[4] = 0;
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EBCASC(temp, 4);
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put_dev_sector(sect);
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if (!strcmp(temp, "VOL1") ||
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!strcmp(temp, "LNX1") ||
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!strcmp(temp, "CMS1")) {
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if (!strcmp(temp, "VOL1")) {
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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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*labelsect = testsect[i];
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found = 1;
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break;
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}
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}
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if (!found)
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memset(label, 0, sizeof(*label));
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return found;
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}
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static int find_vol1_partitions(struct parsed_partitions *state,
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struct hd_geometry *geo,
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int blocksize,
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char name[],
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union label_t *label)
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{
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sector_t blk;
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int counter;
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char tmp[64];
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Sector sect;
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unsigned char *data;
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loff_t offset, size;
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struct vtoc_format1_label f1;
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int secperblk;
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snprintf(tmp, sizeof(tmp), "VOL1/%8s:", name);
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strlcat(state->pp_buf, tmp, PAGE_SIZE);
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/*
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* get start of VTOC from the disk label and then search for format1
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* and format8 labels
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*/
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secperblk = blocksize >> 9;
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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 * secperblk, §);
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while (data != NULL) {
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memcpy(&f1, data, 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, blk * secperblk, §);
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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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offset *= secperblk;
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size *= secperblk;
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if (counter >= state->limit)
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break;
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put_partition(state, counter + 1, offset, size);
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counter++;
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blk++;
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data = read_part_sector(state, blk * secperblk, §);
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}
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strlcat(state->pp_buf, "\n", PAGE_SIZE);
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if (!data)
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return -1;
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return 1;
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}
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static int find_lnx1_partitions(struct parsed_partitions *state,
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struct hd_geometry *geo,
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int blocksize,
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char name[],
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union label_t *label,
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sector_t labelsect,
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loff_t i_size,
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dasd_information2_t *info)
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{
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loff_t offset, geo_size, size;
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char tmp[64];
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int secperblk;
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snprintf(tmp, sizeof(tmp), "LNX1/%8s:", name);
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strlcat(state->pp_buf, tmp, PAGE_SIZE);
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secperblk = blocksize >> 9;
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if (label->lnx.ldl_version == 0xf2) {
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size = label->lnx.formatted_blocks * secperblk;
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} else {
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/*
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* Formated w/o large volume support. If the sanity check
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* 'size based on geo == size based on i_size' is true, then
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* we can safely assume that we know the formatted size of
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* the disk, otherwise we need additional information
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* that we can only get from a real DASD device.
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*/
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geo_size = geo->cylinders * geo->heads
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* geo->sectors * secperblk;
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size = i_size >> 9;
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if (size != geo_size) {
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if (!info) {
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strlcat(state->pp_buf, "\n", PAGE_SIZE);
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return 1;
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}
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if (!strcmp(info->type, "ECKD"))
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if (geo_size < size)
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size = geo_size;
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/* else keep size based on i_size */
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}
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}
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/* first and only partition starts in the first block after the label */
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offset = labelsect + secperblk;
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put_partition(state, 1, offset, size - offset);
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strlcat(state->pp_buf, "\n", PAGE_SIZE);
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return 1;
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}
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static int find_cms1_partitions(struct parsed_partitions *state,
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struct hd_geometry *geo,
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int blocksize,
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char name[],
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union label_t *label,
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sector_t labelsect)
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{
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loff_t offset, size;
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char tmp[64];
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int secperblk;
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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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secperblk = blocksize >> 9;
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if (label->cms.disk_offset != 0) {
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snprintf(tmp, sizeof(tmp), "CMS1/%8s(MDSK):", name);
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strlcat(state->pp_buf, tmp, PAGE_SIZE);
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/* disk is reserved minidisk */
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offset = label->cms.disk_offset * secperblk;
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size = (label->cms.block_count - 1) * secperblk;
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} else {
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snprintf(tmp, sizeof(tmp), "CMS1/%8s:", name);
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strlcat(state->pp_buf, tmp, PAGE_SIZE);
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/*
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* Special case for FBA devices:
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* If an FBA device is CMS formatted with blocksize > 512 byte
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* and the DIAG discipline is used, then the CMS label is found
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* in sector 1 instead of block 1. However, the partition is
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* still supposed to start in block 2.
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*/
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if (labelsect == 1)
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offset = 2 * secperblk;
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else
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offset = labelsect + secperblk;
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size = label->cms.block_count * secperblk;
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}
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put_partition(state, 1, offset, size-offset);
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strlcat(state->pp_buf, "\n", PAGE_SIZE);
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return 1;
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}
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/*
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* This is the main function, called by check.c
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*/
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int ibm_partition(struct parsed_partitions *state)
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{
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int (*fn)(struct gendisk *disk, dasd_information2_t *info);
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struct block_device *bdev = state->bdev;
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struct gendisk *disk = bdev->bd_disk;
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int blocksize, res;
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loff_t i_size, offset, 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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sector_t labelsect;
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union label_t *label;
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res = 0;
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if (!disk->fops->getgeo)
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goto out_exit;
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fn = symbol_get(dasd_biodasdinfo);
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if (!fn)
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goto out_exit;
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blocksize = bdev_logical_block_size(bdev);
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if (blocksize <= 0)
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goto out_symbol;
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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_symbol;
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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_symbol;
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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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/* set start if not filled by getgeo function e.g. virtblk */
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geo->start = get_start_sect(bdev);
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if (disk->fops->getgeo(bdev, geo))
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goto out_freeall;
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if (fn(disk, info)) {
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kfree(info);
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info = NULL;
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}
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if (find_label(state, info, geo, blocksize, &labelsect, name, type,
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label)) {
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if (!strncmp(type, "VOL1", 4)) {
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res = find_vol1_partitions(state, geo, blocksize, name,
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label);
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} else if (!strncmp(type, "LNX1", 4)) {
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res = find_lnx1_partitions(state, geo, blocksize, name,
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label, labelsect, i_size,
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info);
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} else if (!strncmp(type, "CMS1", 4)) {
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res = find_cms1_partitions(state, geo, blocksize, name,
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label, labelsect);
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}
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} else if (info) {
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/*
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* ugly but needed for backward compatibility:
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* If the block device is a DASD (i.e. BIODASDINFO2 works),
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* then we claim it in any case, even though it has no valid
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* label. If it has the LDL format, then we simply define a
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* partition as if it had an LNX1 label.
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*/
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res = 1;
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if (info->format == DASD_FORMAT_LDL) {
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strlcat(state->pp_buf, "(nonl)", PAGE_SIZE);
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size = i_size >> 9;
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offset = (info->label_block + 1) * (blocksize >> 9);
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put_partition(state, 1, offset, size-offset);
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strlcat(state->pp_buf, "\n", PAGE_SIZE);
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}
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} else
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res = 0;
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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_symbol:
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symbol_put(dasd_biodasdinfo);
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out_exit:
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return res;
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}
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