diff options
| -rw-r--r-- | block/partitions/ibm.c | 455 |
1 files changed, 272 insertions, 183 deletions
diff --git a/block/partitions/ibm.c b/block/partitions/ibm.c index 1104acac780..47a61474e79 100644 --- a/block/partitions/ibm.c +++ b/block/partitions/ibm.c @@ -1,9 +1,8 @@ /* - * 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 + * Copyright IBM Corp. 1999, 2012 */ #include <linux/buffer_head.h> @@ -17,17 +16,23 @@ #include "check.h" #include "ibm.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) { - +static sector_t cchh2blk(struct vtoc_cchh *ptr, struct hd_geometry *geo) +{ sector_t cyl; __u16 head; - /*decode cylinder and heads for large volumes */ + /* decode cylinder and heads for large volumes */ cyl = ptr->hh & 0xFFF0; cyl <<= 12; cyl |= ptr->cc; @@ -40,13 +45,12 @@ cchh2blk (struct vtoc_cchh *ptr, struct hd_geometry *geo) { * compute the block number from a * cyl-cyl-head-head-block structure */ -static sector_t -cchhb2blk (struct vtoc_cchhb *ptr, struct hd_geometry *geo) { - +static sector_t cchhb2blk(struct vtoc_cchhb *ptr, struct hd_geometry *geo) +{ sector_t cyl; __u16 head; - /*decode cylinder and heads for large volumes */ + /* decode cylinder and heads for large volumes */ cyl = ptr->hh & 0xFFF0; cyl <<= 12; cyl |= ptr->cc; @@ -56,26 +60,243 @@ cchhb2blk (struct vtoc_cchhb *ptr, struct hd_geometry *geo) { 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, + loff_t i_size, + 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 i_size' 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 = i_size >> 9; + 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 i_size */ + } + } + /* 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) { struct block_device *bdev = state->bdev; int blocksize, res; - loff_t i_size, offset, size, fmt_size; + loff_t i_size, offset, 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; - char tmp[64]; + union label_t *label; res = 0; blocksize = bdev_logical_block_size(bdev); @@ -84,7 +305,6 @@ int ibm_partition(struct parsed_partitions *state) 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; @@ -94,176 +314,45 @@ int ibm_partition(struct parsed_partitions *state) 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) + if (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, §); - 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); + if (ioctl_by_bdev(bdev, BIODASDINFO2, (unsigned long)info) != 0) { + kfree(info); + info = NULL; } - 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) { - snprintf(tmp, sizeof(tmp), "CMS1/%8s(MDSK):", name); - strlcat(state->pp_buf, tmp, PAGE_SIZE); - /* disk is reserved minidisk */ - offset = label->cms.disk_offset; - size = (label->cms.block_count - 1) - * (blocksize >> 9); - } else { - snprintf(tmp, sizeof(tmp), "CMS1/%8s:", name); - strlcat(state->pp_buf, tmp, PAGE_SIZE); - 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) { - snprintf(tmp, sizeof(tmp), "LNX1/%8s:", name); - strlcat(state->pp_buf, tmp, PAGE_SIZE); - 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 */ - strlcat(state->pp_buf, "(nonl)", PAGE_SIZE); - size = i_size >> 9; - offset = (info->label_block + 1); - } - put_partition(state, 1, offset*(blocksize >> 9), - size-offset*(blocksize >> 9)); + 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, i_size, + info); + } else if (!strncmp(type, "CMS1", 4)) { + res = find_cms1_partitions(state, geo, blocksize, name, + label, labelsect); } - } else if (info->format == DASD_FORMAT_CDL) { - /* - * New style CDL formatted disk - */ - sector_t blk; - int counter; - + } else if (info) { /* - * check if VOL1 label is available - * if not, something is wrong, skipping partition detection + * 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. */ - if (strncmp(type, "VOL1", 4) == 0) { - snprintf(tmp, sizeof(tmp), "VOL1/%8s:", name); - strlcat(state->pp_buf, tmp, PAGE_SIZE); - /* - * 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), - §); - 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), §); - 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), §); - } - - if (!data) - /* Are we not supposed to report this ? */ - goto out_readerr; - } else - printk(KERN_INFO "Expected Label VOL1 not " - "found, treating as CDL formated Disk"); - - } - - strlcat(state->pp_buf, "\n", PAGE_SIZE); - goto out_freeall; - + res = 1; + if (info->format == DASD_FORMAT_LDL) { + strlcat(state->pp_buf, "(nonl)", PAGE_SIZE); + size = i_size >> 9; + 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_readerr: - res = -1; out_freeall: kfree(label); out_nolab: |