2 * File...........: linux/fs/partitions/ibm.c
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Volker Sameske <sameske@de.ibm.com>
5 * Bugreports.to..: <Linux390@de.ibm.com>
6 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
9 #include <linux/buffer_head.h>
10 #include <linux/hdreg.h>
11 #include <linux/slab.h>
13 #include <asm/ebcdic.h>
14 #include <asm/uaccess.h>
21 * compute the block number from a
22 * cyl-cyl-head-head structure
25 cchh2blk (struct vtoc_cchh *ptr, struct hd_geometry *geo) {
30 /*decode cylinder and heads for large volumes */
31 cyl = ptr->hh & 0xFFF0;
34 head = ptr->hh & 0x000F;
35 return cyl * geo->heads * geo->sectors +
40 * compute the block number from a
41 * cyl-cyl-head-head-block structure
44 cchhb2blk (struct vtoc_cchhb *ptr, struct hd_geometry *geo) {
49 /*decode cylinder and heads for large volumes */
50 cyl = ptr->hh & 0xFFF0;
53 head = ptr->hh & 0x000F;
54 return cyl * geo->heads * geo->sectors +
61 int ibm_partition(struct parsed_partitions *state)
63 struct block_device *bdev = state->bdev;
65 loff_t i_size, offset, size, fmt_size;
66 dasd_information2_t *info;
67 struct hd_geometry *geo;
71 struct vtoc_volume_label_cdl vol;
72 struct vtoc_volume_label_ldl lnx;
73 struct vtoc_cms_label cms;
79 blocksize = bdev_logical_block_size(bdev);
82 i_size = i_size_read(bdev->bd_inode);
86 info = kmalloc(sizeof(dasd_information2_t), GFP_KERNEL);
89 geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL);
92 label = kmalloc(sizeof(union label_t), GFP_KERNEL);
96 if (ioctl_by_bdev(bdev, BIODASDINFO2, (unsigned long)info) != 0 ||
97 ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
101 * Get volume label, extract name and type.
103 data = read_part_sector(state, info->label_block*(blocksize/512),
108 memcpy(label, data, sizeof(union label_t));
109 put_dev_sector(sect);
111 if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) {
112 strncpy(type, label->vol.vollbl, 4);
113 strncpy(name, label->vol.volid, 6);
115 strncpy(type, label->lnx.vollbl, 4);
116 strncpy(name, label->lnx.volid, 6);
124 * Three different formats: LDL, CDL and unformated disk
126 * identified by info->format
128 * unformated disks we do not have to care about
130 if (info->format == DASD_FORMAT_LDL) {
131 if (strncmp(type, "CMS1", 4) == 0) {
133 * VM style CMS1 labeled disk
135 blocksize = label->cms.block_size;
136 if (label->cms.disk_offset != 0) {
137 printk("CMS1/%8s(MDSK):", name);
138 /* disk is reserved minidisk */
139 offset = label->cms.disk_offset;
140 size = (label->cms.block_count - 1)
143 printk("CMS1/%8s:", name);
144 offset = (info->label_block + 1);
145 size = label->cms.block_count
148 put_partition(state, 1, offset*(blocksize >> 9),
149 size-offset*(blocksize >> 9));
151 if (strncmp(type, "LNX1", 4) == 0) {
152 printk("LNX1/%8s:", name);
153 if (label->lnx.ldl_version == 0xf2) {
154 fmt_size = label->lnx.formatted_blocks
156 } else if (!strcmp(info->type, "ECKD")) {
157 /* formated w/o large volume support */
158 fmt_size = geo->cylinders * geo->heads
159 * geo->sectors * (blocksize >> 9);
161 /* old label and no usable disk geometry
163 fmt_size = i_size >> 9;
168 offset = (info->label_block + 1);
173 offset = (info->label_block + 1);
175 put_partition(state, 1, offset*(blocksize >> 9),
176 size-offset*(blocksize >> 9));
178 } else if (info->format == DASD_FORMAT_CDL) {
180 * New style CDL formatted disk
186 * check if VOL1 label is available
187 * if not, something is wrong, skipping partition detection
189 if (strncmp(type, "VOL1", 4) == 0) {
190 printk("VOL1/%8s:", name);
192 * get block number and read then go through format1
195 blk = cchhb2blk(&label->vol.vtoc, geo) + 1;
197 data = read_part_sector(state, blk * (blocksize/512),
199 while (data != NULL) {
200 struct vtoc_format1_label f1;
203 sizeof(struct vtoc_format1_label));
204 put_dev_sector(sect);
206 /* skip FMT4 / FMT5 / FMT7 labels */
207 if (f1.DS1FMTID == _ascebc['4']
208 || f1.DS1FMTID == _ascebc['5']
209 || f1.DS1FMTID == _ascebc['7']
210 || f1.DS1FMTID == _ascebc['9']) {
212 data = read_part_sector(state,
213 blk * (blocksize/512), §);
217 /* only FMT1 and 8 labels valid at this point */
218 if (f1.DS1FMTID != _ascebc['1'] &&
219 f1.DS1FMTID != _ascebc['8'])
222 /* OK, we got valid partition data */
223 offset = cchh2blk(&f1.DS1EXT1.llimit, geo);
224 size = cchh2blk(&f1.DS1EXT1.ulimit, geo) -
225 offset + geo->sectors;
226 if (counter >= state->limit)
228 put_partition(state, counter + 1,
229 offset * (blocksize >> 9),
230 size * (blocksize >> 9));
233 data = read_part_sector(state,
234 blk * (blocksize/512), §);
238 /* Are we not supposed to report this ? */
241 printk(KERN_WARNING "Warning, expected Label VOL1 not "
242 "found, treating as CDL formated Disk");