diff options
Diffstat (limited to 'fs/partitions/ibm.c')
| -rw-r--r-- | fs/partitions/ibm.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/fs/partitions/ibm.c b/fs/partitions/ibm.c new file mode 100644 index 00000000000..d59dcbf2bd4 --- /dev/null +++ b/fs/partitions/ibm.c @@ -0,0 +1,191 @@ +/* + * 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 + + * History of changes (starts July 2000) + * 07/10/00 Fixed detection of CMS formatted disks + * 02/13/00 VTOC partition support added + * 12/27/01 fixed PL030593 (CMS reserved minidisk not detected on 64 bit) + * 07/24/03 no longer using contents of freed page for CMS label recognition (BZ3611) + */ + +#include <linux/config.h> +#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 inline int +cchh2blk (cchh_t *ptr, struct hd_geometry *geo) { + return ptr->cc * geo->heads * geo->sectors + + ptr->hh * geo->sectors; +} + + +/* + * compute the block number from a + * cyl-cyl-head-head-block structure + */ +static inline int +cchhb2blk (cchhb_t *ptr, struct hd_geometry *geo) { + return ptr->cc * geo->heads * geo->sectors + + ptr->hh * geo->sectors + + ptr->b; +} + +/* + */ +int +ibm_partition(struct parsed_partitions *state, struct block_device *bdev) +{ + int blocksize, offset, size; + dasd_information_t *info; + struct hd_geometry *geo; + char type[5] = {0,}; + char name[7] = {0,}; + volume_label_t *vlabel; + unsigned char *data; + Sector sect; + + if ((info = kmalloc(sizeof(dasd_information_t), GFP_KERNEL)) == NULL) + goto out_noinfo; + if ((geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL)) == NULL) + goto out_nogeo; + if ((vlabel = kmalloc(sizeof(volume_label_t), GFP_KERNEL)) == NULL) + goto out_novlab; + + if (ioctl_by_bdev(bdev, BIODASDINFO, (unsigned long)info) != 0 || + ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0) + goto out_noioctl; + + if ((blocksize = bdev_hardsect_size(bdev)) <= 0) + goto out_badsect; + + /* + * Get volume label, extract name and type. + */ + data = read_dev_sector(bdev, info->label_block*(blocksize/512), §); + if (data == NULL) + goto out_readerr; + + strncpy (type, data, 4); + if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) + strncpy(name, data + 8, 6); + else + strncpy(name, data + 4, 6); + memcpy (vlabel, data, sizeof(volume_label_t)); + put_dev_sector(sect); + + EBCASC(type, 4); + EBCASC(name, 6); + + /* + * Three different types: CMS1, VOL1 and LNX1/unlabeled + */ + if (strncmp(type, "CMS1", 4) == 0) { + /* + * VM style CMS1 labeled disk + */ + int *label = (int *) vlabel; + + if (label[13] != 0) { + printk("CMS1/%8s(MDSK):", name); + /* disk is reserved minidisk */ + blocksize = label[3]; + offset = label[13]; + size = (label[7] - 1)*(blocksize >> 9); + } else { + printk("CMS1/%8s:", name); + offset = (info->label_block + 1); + size = bdev->bd_inode->i_size >> 9; + } + put_partition(state, 1, offset*(blocksize >> 9), + size-offset*(blocksize >> 9)); + } else if ((strncmp(type, "VOL1", 4) == 0) && + (!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) { + /* + * New style VOL1 labeled disk + */ + unsigned int blk; + int counter; + + printk("VOL1/%8s:", name); + + /* get block number and read then go through format1 labels */ + blk = cchhb2blk(&vlabel->vtoc, geo) + 1; + counter = 0; + while ((data = read_dev_sector(bdev, blk*(blocksize/512), + §)) != NULL) { + format1_label_t f1; + + memcpy(&f1, data, sizeof(format1_label_t)); + put_dev_sector(sect); + + /* skip FMT4 / FMT5 / FMT7 labels */ + if (f1.DS1FMTID == _ascebc['4'] + || f1.DS1FMTID == _ascebc['5'] + || f1.DS1FMTID == _ascebc['7']) { + blk++; + continue; + } + + /* only FMT1 valid at this point */ + if (f1.DS1FMTID != _ascebc['1']) + 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++; + } + } else { + /* + * Old style LNX1 or unlabeled disk + */ + if (strncmp(type, "LNX1", 4) == 0) + printk ("LNX1/%8s:", name); + else + printk("(nonl)/%8s:", name); + offset = (info->label_block + 1); + size = (bdev->bd_inode->i_size >> 9); + put_partition(state, 1, offset*(blocksize >> 9), + size-offset*(blocksize >> 9)); + } + + printk("\n"); + kfree(vlabel); + kfree(geo); + kfree(info); + return 1; + +out_readerr: +out_badsect: +out_noioctl: + kfree(vlabel); +out_novlab: + kfree(geo); +out_nogeo: + kfree(info); +out_noinfo: + return 0; +} |