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-rw-r--r--block/partitions/ibm.c275
1 files changed, 275 insertions, 0 deletions
diff --git a/block/partitions/ibm.c b/block/partitions/ibm.c
new file mode 100644
index 000000000000..d513a07f44bb
--- /dev/null
+++ b/block/partitions/ibm.c
@@ -0,0 +1,275 @@
+/*
+ * 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 sector_t
+cchh2blk (struct vtoc_cchh *ptr, struct hd_geometry *geo) {
+
+ sector_t cyl;
+ __u16 head;
+
+ /*decode cylinder and heads for large volumes */
+ cyl = ptr->hh & 0xFFF0;
+ cyl <<= 12;
+ cyl |= ptr->cc;
+ head = ptr->hh & 0x000F;
+ return cyl * geo->heads * geo->sectors +
+ head * geo->sectors;
+}
+
+/*
+ * compute the block number from a
+ * cyl-cyl-head-head-block structure
+ */
+static sector_t
+cchhb2blk (struct vtoc_cchhb *ptr, struct hd_geometry *geo) {
+
+ sector_t cyl;
+ __u16 head;
+
+ /*decode cylinder and heads for large volumes */
+ cyl = ptr->hh & 0xFFF0;
+ cyl <<= 12;
+ cyl |= ptr->cc;
+ head = ptr->hh & 0x000F;
+ return cyl * geo->heads * geo->sectors +
+ head * geo->sectors +
+ ptr->b;
+}
+
+/*
+ */
+int ibm_partition(struct parsed_partitions *state)
+{
+ struct block_device *bdev = state->bdev;
+ int blocksize, res;
+ loff_t i_size, offset, size, fmt_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];
+
+ res = 0;
+ blocksize = bdev_logical_block_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;
+
+ /*
+ * 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, &sect);
+ 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);
+ }
+ 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));
+ }
+ } else if (info->format == DASD_FORMAT_CDL) {
+ /*
+ * New style CDL formatted disk
+ */
+ sector_t blk;
+ int counter;
+
+ /*
+ * check if VOL1 label is available
+ * if not, something is wrong, skipping partition detection
+ */
+ 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),
+ &sect);
+ 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), &sect);
+ 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), &sect);
+ }
+
+ 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");
+
+ }
+
+ strlcat(state->pp_buf, "\n", PAGE_SIZE);
+ goto out_freeall;
+
+
+out_readerr:
+ res = -1;
+out_freeall:
+ kfree(label);
+out_nolab:
+ kfree(geo);
+out_nogeo:
+ kfree(info);
+out_exit:
+ return res;
+}
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