[S390] fixed cdl-format detection.

CDL formated DASDs are now detected correctly even if no VOL1 label is
on the disk. This prevents possible loss of data.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 97 insertions, 70 deletions

diff --git a/fs/partitions/ibm.c b/fs/partitions/ibm.c
index 9f7ad4244f63..1e064c4a4f86 100644
--- a/fs/partitions/ibm.c
+++ b/fs/partitions/ibm.c
@@ -45,7 +45,7 @@ ibm_partition(struct parsed_partitions *state, struct block_device *bdev)
 {
         int blocksize, offset, size,res;
         loff_t i_size;
-        dasd_information_t *info;
+        dasd_information2_t *info;
         struct hd_geometry *geo;
         char type[5] = {0,};
         char name[7] = {0,};
@@ -64,14 +64,17 @@ ibm_partition(struct parsed_partitions *state, struct block_device *bdev)
         if (i_size == 0)
                 goto out_exit;
 
-        if ((info = kmalloc(sizeof(dasd_information_t), GFP_KERNEL)) == NULL)
+        info = kmalloc(sizeof(dasd_information2_t), GFP_KERNEL);
+        if (info == NULL)
                 goto out_exit;
-        if ((geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL)) == NULL)
+        geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL);
+        if (geo == NULL)
                 goto out_nogeo;
-        if ((label = kmalloc(sizeof(union label_t), GFP_KERNEL)) == NULL)
+        label = kmalloc(sizeof(union label_t), GFP_KERNEL);
+        if (label == NULL)
                 goto out_nolab;
 
-        if (ioctl_by_bdev(bdev, BIODASDINFO, (unsigned long)info) != 0 ||
+        if (ioctl_by_bdev(bdev, BIODASDINFO2, (unsigned long)info) != 0 ||
             ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
                 goto out_freeall;
 
@@ -96,84 +99,108 @@ ibm_partition(struct parsed_partitions *state, struct block_device *bdev)
         res = 1;
 
         /*
-         * Three different types: CMS1, VOL1 and LNX1/unlabeled
+         * Three different formats: LDL, CDL and unformated disk
+         *
+         * identified by info->format
+         *
+         * unformated disks we do not have to care about
          */
-        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);
+        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 {
-                        printk("CMS1/%8s:", name);
+                        /*
+                         * 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 ((strncmp(type, "VOL1", 4) == 0) &&
-                (!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) {
+                                      size-offset*(blocksize >> 9));
+        } else if (info->format == DASD_FORMAT_CDL) {
                 /*
-                 * New style VOL1 labeled disk
+                 * New style CDL formatted disk
                  */
                 unsigned int blk;
                 int counter;
 
-                printk("VOL1/%8s:", name);
-
-                /* get block number and read then go through format1 labels */
-                blk = cchhb2blk(&label->vol.vtoc, geo) + 1;
-                counter = 0;
-                while ((data = read_dev_sector(bdev, blk*(blocksize/512),
-                                               &sect)) != 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++;
-                                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++;
-                }
-                if (!data)
-                /* Are we not supposed to report this ? */
-                        goto out_readerr;
-        } else {
                 /*
-                 * Old style LNX1 or unlabeled disk
+                 * check if VOL1 label is available
+                 * if not, something is wrong, skipping partition detection
                  */
-                if (strncmp(type, "LNX1", 4) == 0)
-                        printk ("LNX1/%8s:", name);
-                else
-                        printk("(nonl)/%8s:", name);
-                offset = (info->label_block + 1);
-                size = i_size >> 9;
-                put_partition(state, 1, offset*(blocksize >> 9),
-                              size-offset*(blocksize >> 9));
+                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),
+                                               &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']) {
+                                        blk++;
+                                        data = read_dev_sector(bdev, blk *
+                                                               (blocksize/512),
+                                                                &sect);
+                                        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),
+                                                       &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");
+
         }
 
         printk("\n");