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/openbmc/linux/drivers/s390/block/ |
H A D | dasd_eckd.c | 2cc9637c Fri Mar 22 10:01:17 CDT 2019 Peter Oberparleiter <oberpar@linux.ibm.com> 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> 2cc9637c Fri Mar 22 10:01:17 CDT 2019 Peter Oberparleiter <oberpar@linux.ibm.com> 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>
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