/* * 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; }