From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- block/partitions/ibm.c | 376 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 376 insertions(+) create mode 100644 block/partitions/ibm.c (limited to 'block/partitions/ibm.c') diff --git a/block/partitions/ibm.c b/block/partitions/ibm.c new file mode 100644 index 000000000..403756dbd --- /dev/null +++ b/block/partitions/ibm.c @@ -0,0 +1,376 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Author(s)......: Holger Smolinski + * Volker Sameske + * Bugreports.to..: + * Copyright IBM Corp. 1999, 2012 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "check.h" + +union label_t { + struct vtoc_volume_label_cdl vol; + struct vtoc_volume_label_ldl lnx; + struct vtoc_cms_label cms; +}; + +/* + * 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; +} + +static int find_label(struct parsed_partitions *state, + dasd_information2_t *info, + struct hd_geometry *geo, + int blocksize, + sector_t *labelsect, + char name[], + char type[], + union label_t *label) +{ + Sector sect; + unsigned char *data; + sector_t testsect[3]; + unsigned char temp[5]; + int found = 0; + int i, testcount; + + /* There a three places where we may find a valid label: + * - on an ECKD disk it's block 2 + * - on an FBA disk it's block 1 + * - on an CMS formatted FBA disk it is sector 1, even if the block size + * is larger than 512 bytes (possible if the DIAG discipline is used) + * If we have a valid info structure, then we know exactly which case we + * have, otherwise we just search through all possebilities. + */ + if (info) { + if ((info->cu_type == 0x6310 && info->dev_type == 0x9336) || + (info->cu_type == 0x3880 && info->dev_type == 0x3370)) + testsect[0] = info->label_block; + else + testsect[0] = info->label_block * (blocksize >> 9); + testcount = 1; + } else { + testsect[0] = 1; + testsect[1] = (blocksize >> 9); + testsect[2] = 2 * (blocksize >> 9); + testcount = 3; + } + for (i = 0; i < testcount; ++i) { + data = read_part_sector(state, testsect[i], §); + if (data == NULL) + continue; + memcpy(label, data, sizeof(*label)); + memcpy(temp, data, 4); + temp[4] = 0; + EBCASC(temp, 4); + put_dev_sector(sect); + if (!strcmp(temp, "VOL1") || + !strcmp(temp, "LNX1") || + !strcmp(temp, "CMS1")) { + if (!strcmp(temp, "VOL1")) { + 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); + *labelsect = testsect[i]; + found = 1; + break; + } + } + if (!found) + memset(label, 0, sizeof(*label)); + + return found; +} + +static int find_vol1_partitions(struct parsed_partitions *state, + struct hd_geometry *geo, + int blocksize, + char name[], + union label_t *label) +{ + sector_t blk; + int counter; + char tmp[64]; + Sector sect; + unsigned char *data; + loff_t offset, size; + struct vtoc_format1_label f1; + int secperblk; + + snprintf(tmp, sizeof(tmp), "VOL1/%8s:", name); + strlcat(state->pp_buf, tmp, PAGE_SIZE); + /* + * get start of VTOC from the disk label and then search for format1 + * and format8 labels + */ + secperblk = blocksize >> 9; + blk = cchhb2blk(&label->vol.vtoc, geo) + 1; + counter = 0; + data = read_part_sector(state, blk * secperblk, §); + while (data != NULL) { + 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 * secperblk, §); + 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; + offset *= secperblk; + size *= secperblk; + if (counter >= state->limit) + break; + put_partition(state, counter + 1, offset, size); + counter++; + blk++; + data = read_part_sector(state, blk * secperblk, §); + } + strlcat(state->pp_buf, "\n", PAGE_SIZE); + + if (!data) + return -1; + + return 1; +} + +static int find_lnx1_partitions(struct parsed_partitions *state, + struct hd_geometry *geo, + int blocksize, + char name[], + union label_t *label, + sector_t labelsect, + sector_t nr_sectors, + dasd_information2_t *info) +{ + loff_t offset, geo_size, size; + char tmp[64]; + int secperblk; + + snprintf(tmp, sizeof(tmp), "LNX1/%8s:", name); + strlcat(state->pp_buf, tmp, PAGE_SIZE); + secperblk = blocksize >> 9; + if (label->lnx.ldl_version == 0xf2) { + size = label->lnx.formatted_blocks * secperblk; + } else { + /* + * Formated w/o large volume support. If the sanity check + * 'size based on geo == size based on nr_sectors' is true, then + * we can safely assume that we know the formatted size of + * the disk, otherwise we need additional information + * that we can only get from a real DASD device. + */ + geo_size = geo->cylinders * geo->heads + * geo->sectors * secperblk; + size = nr_sectors; + if (size != geo_size) { + if (!info) { + strlcat(state->pp_buf, "\n", PAGE_SIZE); + return 1; + } + if (!strcmp(info->type, "ECKD")) + if (geo_size < size) + size = geo_size; + /* else keep size based on nr_sectors */ + } + } + /* first and only partition starts in the first block after the label */ + offset = labelsect + secperblk; + put_partition(state, 1, offset, size - offset); + strlcat(state->pp_buf, "\n", PAGE_SIZE); + return 1; +} + +static int find_cms1_partitions(struct parsed_partitions *state, + struct hd_geometry *geo, + int blocksize, + char name[], + union label_t *label, + sector_t labelsect) +{ + loff_t offset, size; + char tmp[64]; + int secperblk; + + /* + * VM style CMS1 labeled disk + */ + blocksize = label->cms.block_size; + secperblk = blocksize >> 9; + if (label->cms.disk_offset != 0) { + snprintf(tmp, sizeof(tmp), "CMS1/%8s(MDSK):", name); + strlcat(state->pp_buf, tmp, PAGE_SIZE); + /* disk is reserved minidisk */ + offset = label->cms.disk_offset * secperblk; + size = (label->cms.block_count - 1) * secperblk; + } else { + snprintf(tmp, sizeof(tmp), "CMS1/%8s:", name); + strlcat(state->pp_buf, tmp, PAGE_SIZE); + /* + * Special case for FBA devices: + * If an FBA device is CMS formatted with blocksize > 512 byte + * and the DIAG discipline is used, then the CMS label is found + * in sector 1 instead of block 1. However, the partition is + * still supposed to start in block 2. + */ + if (labelsect == 1) + offset = 2 * secperblk; + else + offset = labelsect + secperblk; + size = label->cms.block_count * secperblk; + } + + put_partition(state, 1, offset, size-offset); + strlcat(state->pp_buf, "\n", PAGE_SIZE); + return 1; +} + + +/* + * This is the main function, called by check.c + */ +int ibm_partition(struct parsed_partitions *state) +{ + int (*fn)(struct gendisk *disk, dasd_information2_t *info); + struct gendisk *disk = state->disk; + struct block_device *bdev = disk->part0; + int blocksize, res; + loff_t offset, size; + sector_t nr_sectors; + dasd_information2_t *info; + struct hd_geometry *geo; + char type[5] = {0,}; + char name[7] = {0,}; + sector_t labelsect; + union label_t *label; + + res = 0; + if (!disk->fops->getgeo) + goto out_exit; + fn = symbol_get(dasd_biodasdinfo); + blocksize = bdev_logical_block_size(bdev); + if (blocksize <= 0) + goto out_symbol; + nr_sectors = bdev_nr_sectors(bdev); + if (nr_sectors == 0) + goto out_symbol; + info = kmalloc(sizeof(dasd_information2_t), GFP_KERNEL); + if (info == NULL) + goto out_symbol; + 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; + /* set start if not filled by getgeo function e.g. virtblk */ + geo->start = get_start_sect(bdev); + if (disk->fops->getgeo(bdev, geo)) + goto out_freeall; + if (!fn || fn(disk, info)) { + kfree(info); + info = NULL; + } + + if (find_label(state, info, geo, blocksize, &labelsect, name, type, + label)) { + if (!strncmp(type, "VOL1", 4)) { + res = find_vol1_partitions(state, geo, blocksize, name, + label); + } else if (!strncmp(type, "LNX1", 4)) { + res = find_lnx1_partitions(state, geo, blocksize, name, + label, labelsect, nr_sectors, + info); + } else if (!strncmp(type, "CMS1", 4)) { + res = find_cms1_partitions(state, geo, blocksize, name, + label, labelsect); + } + } else if (info) { + /* + * ugly but needed for backward compatibility: + * If the block device is a DASD (i.e. BIODASDINFO2 works), + * then we claim it in any case, even though it has no valid + * label. If it has the LDL format, then we simply define a + * partition as if it had an LNX1 label. + */ + res = 1; + if (info->format == DASD_FORMAT_LDL) { + strlcat(state->pp_buf, "(nonl)", PAGE_SIZE); + size = nr_sectors; + offset = (info->label_block + 1) * (blocksize >> 9); + put_partition(state, 1, offset, size-offset); + strlcat(state->pp_buf, "\n", PAGE_SIZE); + } + } else + res = 0; + +out_freeall: + kfree(label); +out_nolab: + kfree(geo); +out_nogeo: + kfree(info); +out_symbol: + if (fn) + symbol_put(dasd_biodasdinfo); +out_exit: + return res; +} -- cgit v1.2.3