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[/] [or1k/] [tags/] [LINUX_2_4_26_OR32/] [linux/] [linux-2.4/] [fs/] [partitions/] [ibm.c] - Rev 1275
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/* * 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) */ #include <linux/config.h> #include <linux/fs.h> #include <linux/genhd.h> #include <linux/kernel.h> #include <linux/major.h> #include <linux/string.h> #include <linux/blk.h> #include <linux/slab.h> #include <linux/hdreg.h> #include <linux/ioctl.h> #include <linux/version.h> #include <asm/ebcdic.h> #include <asm/uaccess.h> #include <asm/dasd.h> #include "ibm.h" #include "check.h" #include <asm/vtoc.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; } /* * We used to use ioctl_by_bdev in early 2.4, but it broke * between 2.4.9 and 2.4.18 somewhere. */ extern int (*genhd_dasd_ioctl)(struct inode *inp, struct file *filp, unsigned int no, unsigned long data); static int ibm_ioctl_unopened(struct block_device *bdev, unsigned cmd, unsigned long arg) { int res; mm_segment_t old_fs = get_fs(); if (genhd_dasd_ioctl == NULL) return -ENODEV; #if 0 lock_kernel(); if (bd_ops->owner) __MOD_INC_USE_COUNT(bdev->bd_op->owner); unlock_kernel(); #endif set_fs(KERNEL_DS); res = (*genhd_dasd_ioctl)(bdev->bd_inode, NULL, cmd, arg); set_fs(old_fs); #if 0 lock_kernel(); if (bd_ops->owner) __MOD_DEV_USE_COUNT(bd_ops->owner); unlock_kernel(); #endif return res; } /* */ int ibm_partition(struct gendisk *hd, struct block_device *bdev, unsigned long first_sector, int first_part_minor) { 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 ( first_sector != 0 ) BUG(); 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 (ibm_ioctl_unopened(bdev, BIODASDINFO, (unsigned long)info) != 0 || ibm_ioctl_unopened(bdev, HDIO_GETGEO, (unsigned long)geo) != 0) goto out_noioctl; if ((blocksize = get_hardsect_size(to_kdev_t(bdev->bd_dev))) <= 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 *) data; 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; } // add_gd_partition(hd, first_part_minor - 1, 0, size); add_gd_partition(hd, first_part_minor, offset*(blocksize >> 9), size-offset*(blocksize >> 9)); } else if (strncmp(type, "VOL1", 4) == 0) { /* * 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 >= hd->max_p) break; add_gd_partition(hd, first_part_minor + counter, 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); // add_gd_partition(hd, first_part_minor - 1, 0, size); add_gd_partition(hd, first_part_minor, 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; }
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