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
8 * History of changes (starts July 2000)
9 * 07/10/00 Fixed detection of CMS formatted disks
10 * 02/13/00 VTOC partition support added
11 * 12/27/01 fixed PL030593 (CMS reserved minidisk not detected on 64 bit)
12 * 07/24/03 no longer using contents of freed page for CMS label recognition (BZ3611)
15 #include <linux/config.h>
16 #include <linux/buffer_head.h>
17 #include <linux/hdreg.h>
18 #include <linux/slab.h>
20 #include <asm/ebcdic.h>
21 #include <asm/uaccess.h>
28 * compute the block number from a
29 * cyl-cyl-head-head structure
32 cchh2blk (struct vtoc_cchh *ptr, struct hd_geometry *geo) {
33 return ptr->cc * geo->heads * geo->sectors +
34 ptr->hh * geo->sectors;
39 * compute the block number from a
40 * cyl-cyl-head-head-block structure
43 cchhb2blk (struct vtoc_cchhb *ptr, struct hd_geometry *geo) {
44 return ptr->cc * geo->heads * geo->sectors +
45 ptr->hh * geo->sectors +
52 ibm_partition(struct parsed_partitions *state, struct block_device *bdev)
54 int blocksize, offset, size;
56 dasd_information_t *info;
57 struct hd_geometry *geo;
61 struct vtoc_volume_label vol;
62 struct vtoc_cms_label cms;
67 blocksize = bdev_hardsect_size(bdev);
70 i_size = i_size_read(bdev->bd_inode);
74 if ((info = kmalloc(sizeof(dasd_information_t), GFP_KERNEL)) == NULL)
76 if ((geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL)) == NULL)
78 if ((label = kmalloc(sizeof(union label_t), GFP_KERNEL)) == NULL)
81 if (ioctl_by_bdev(bdev, BIODASDINFO, (unsigned long)info) != 0 ||
82 ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
86 * Get volume label, extract name and type.
88 data = read_dev_sector(bdev, info->label_block*(blocksize/512), §);
92 strncpy (type, data, 4);
93 if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD")))
94 strncpy(name, data + 8, 6);
96 strncpy(name, data + 4, 6);
97 memcpy(label, data, sizeof(union label_t));
104 * Three different types: CMS1, VOL1 and LNX1/unlabeled
106 if (strncmp(type, "CMS1", 4) == 0) {
108 * VM style CMS1 labeled disk
110 if (label->cms.disk_offset != 0) {
111 printk("CMS1/%8s(MDSK):", name);
112 /* disk is reserved minidisk */
113 blocksize = label->cms.block_size;
114 offset = label->cms.disk_offset;
115 size = (label->cms.block_count - 1) * (blocksize >> 9);
117 printk("CMS1/%8s:", name);
118 offset = (info->label_block + 1);
121 put_partition(state, 1, offset*(blocksize >> 9),
122 size-offset*(blocksize >> 9));
123 } else if ((strncmp(type, "VOL1", 4) == 0) &&
124 (!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) {
126 * New style VOL1 labeled disk
131 printk("VOL1/%8s:", name);
133 /* get block number and read then go through format1 labels */
134 blk = cchhb2blk(&label->vol.vtoc, geo) + 1;
136 while ((data = read_dev_sector(bdev, blk*(blocksize/512),
138 struct vtoc_format1_label f1;
140 memcpy(&f1, data, sizeof(struct vtoc_format1_label));
141 put_dev_sector(sect);
143 /* skip FMT4 / FMT5 / FMT7 labels */
144 if (f1.DS1FMTID == _ascebc['4']
145 || f1.DS1FMTID == _ascebc['5']
146 || f1.DS1FMTID == _ascebc['7']) {
151 /* only FMT1 valid at this point */
152 if (f1.DS1FMTID != _ascebc['1'])
155 /* OK, we got valid partition data */
156 offset = cchh2blk(&f1.DS1EXT1.llimit, geo);
157 size = cchh2blk(&f1.DS1EXT1.ulimit, geo) -
158 offset + geo->sectors;
159 if (counter >= state->limit)
161 put_partition(state, counter + 1,
162 offset * (blocksize >> 9),
163 size * (blocksize >> 9));
169 * Old style LNX1 or unlabeled disk
171 if (strncmp(type, "LNX1", 4) == 0)
172 printk ("LNX1/%8s:", name);
174 printk("(nonl)/%8s:", name);
175 offset = (info->label_block + 1);
177 put_partition(state, 1, offset*(blocksize >> 9),
178 size-offset*(blocksize >> 9));