s390/dasd: Fix capacity calculation for large volumes

The DASD driver incorrectly limits the maximum number of blocks of ECKD
DASD volumes to 32 bit numbers. Volumes with a capacity greater than
2^32-1 blocks are incorrectly recognized as smaller volumes.

This results in the following volume capacity limits depending on the
formatted block size:

  BLKSIZE  MAX_GB   MAX_CYL
      512    2047   5843492
     1024    4095   8676701
     2048    8191  13634816
     4096   16383  23860929

The same problem occurs when a volume with more than 17895697 cylinders
is accessed in raw-track-access mode.

Fix this problem by adding an explicit type cast when calculating the
maximum number of blocks.

Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 6e294b4..f89f9d0 100644 (file)
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -2004,14 +2004,14 @@ static int dasd_eckd_end_analysis(struct dasd_block *block)
        blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
 
 raw:
-       block->blocks = (private->real_cyl *
+       block->blocks = ((unsigned long) private->real_cyl *
                          private->rdc_data.trk_per_cyl *
                          blk_per_trk);
 
        dev_info(&device->cdev->dev,
-                "DASD with %d KB/block, %d KB total size, %d KB/track, "
+                "DASD with %u KB/block, %lu KB total size, %u KB/track, "
                 "%s\n", (block->bp_block >> 10),
-                ((private->real_cyl *
+                (((unsigned long) private->real_cyl *
                   private->rdc_data.trk_per_cyl *
                   blk_per_trk * (block->bp_block >> 9)) >> 1),
                 ((blk_per_trk * block->bp_block) >> 10),