diff options
Diffstat (limited to 'windhoek/partitions/ibm.c')
| -rw-r--r-- | windhoek/partitions/ibm.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/windhoek/partitions/ibm.c b/windhoek/partitions/ibm.c new file mode 100644 index 00000000..1e064c4a --- /dev/null +++ b/windhoek/partitions/ibm.c @@ -0,0 +1,220 @@ +/* + * 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 + */ + +#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 (struct vtoc_cchh *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 (struct vtoc_cchhb *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,res; + loff_t i_size; + dasd_information2_t *info; + struct hd_geometry *geo; + char type[5] = {0,}; + char name[7] = {0,}; + union label_t { + struct vtoc_volume_label vol; + struct vtoc_cms_label cms; + } *label; + unsigned char *data; + Sector sect; + + res = 0; + blocksize = bdev_hardsect_size(bdev); + if (blocksize <= 0) + goto out_exit; + 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; + 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; + + if (ioctl_by_bdev(bdev, BIODASDINFO2, (unsigned long)info) != 0 || + ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0) + goto out_freeall; + + /* + * 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(label, data, sizeof(union label_t)); + put_dev_sector(sect); + + 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 + */ + if (label->cms.disk_offset != 0) { + printk("CMS1/%8s(MDSK):", name); + /* disk is reserved minidisk */ + blocksize = label->cms.block_size; + offset = label->cms.disk_offset; + size = (label->cms.block_count - 1) + * (blocksize >> 9); + } else { + printk("CMS1/%8s:", name); + offset = (info->label_block + 1); + size = i_size >> 9; + } + } else { + /* + * Old style LNX1 or unlabeled disk + */ + if (strncmp(type, "LNX1", 4) == 0) + printk ("LNX1/%8s:", name); + else + printk("(nonl)"); + offset = (info->label_block + 1); + size = i_size >> 9; + } + put_partition(state, 1, offset*(blocksize >> 9), + size-offset*(blocksize >> 9)); + } else if (info->format == DASD_FORMAT_CDL) { + /* + * New style CDL formatted disk + */ + unsigned int blk; + int counter; + + /* + * check if VOL1 label is available + * if not, something is wrong, skipping partition detection + */ + if (strncmp(type, "VOL1", 4) == 0) { + printk("VOL1/%8s:", name); + /* + * get block number and read then go through format1 + * labels + */ + blk = cchhb2blk(&label->vol.vtoc, geo) + 1; + counter = 0; + data = read_dev_sector(bdev, 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']) { + blk++; + data = read_dev_sector(bdev, blk * + (blocksize/512), + §); + 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++; + data = read_dev_sector(bdev, + blk * (blocksize/512), + §); + } + + if (!data) + /* Are we not supposed to report this ? */ + goto out_readerr; + } else + printk(KERN_WARNING "Warning, expected Label VOL1 not " + "found, treating as CDL formated Disk"); + + } + + printk("\n"); + goto out_freeall; + + +out_readerr: + res = -1; +out_freeall: + kfree(label); +out_nolab: + kfree(geo); +out_nogeo: + kfree(info); +out_exit: + return res; +} |