https://github.com/torvalds/linux
Revision 5b53a405e4658580e1faf7c217db3f55a21ba849 authored by Stefan Haberland on 05 May 2022, 14:17:29 UTC, committed by Jens Axboe on 06 May 2022, 02:08:27 UTC
For ESE devices we get an error when accessing an unformatted track. The handling of this error will return zero data for read requests and format the track on demand before writing to it. To do this the code needs to distinguish between read and write requests. This is done with data from the blocklayer request. A pointer to the blocklayer request is stored in the CQR. If there is an error on the device an ERP request is built to do error recovery. While the ERP request is mostly a copy of the original CQR the pointer to the blocklayer request is not copied to not accidentally pass it back to the blocklayer without cleanup. This leads to the error that during ESE handling after an ERP request was built it is not possible to determine the IO direction. This leads to the formatting of a track for read requests which might in turn lead to data corruption. Fixes: 5e2b17e712cf ("s390/dasd: Add dynamic formatting support for ESE volumes") Cc: stable@vger.kernel.org # 5.3+ Signed-off-by: Stefan Haberland <sth@linux.ibm.com> Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com> Link: https://lore.kernel.org/r/20220505141733.1989450-2-sth@linux.ibm.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 parent 285d573
Tip revision: 5b53a405e4658580e1faf7c217db3f55a21ba849 authored by Stefan Haberland on 05 May 2022, 14:17:29 UTC
s390/dasd: fix data corruption for ESE devices
s390/dasd: fix data corruption for ESE devices
Tip revision: 5b53a40
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