linux

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Peter Oberparleiter ee734a2a39 s390/dasd: Fix capacity calculation for large volumes

[ Upstream commit 2cc9637ce8 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2019-05-16 19:43:41 +02:00

dasd_3990_erp.c

s390/dasd: fix wrongly assigned configuration data

2018-03-03 10:23:25 +01:00

dasd_alias.c

s390/dasd: fix IO error for newly defined devices

2018-04-29 11:32:02 +02:00

dasd_devmap.c

s390/dasd: fix panic during offline processing

2016-09-26 16:45:29 +02:00

dasd_diag.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux