Stefan Haberland fbbacd0dcb s390/dasd: fix data corruption for thin provisioned devices ... commit 5e6bdd37c5 upstream. Devices are formatted in multiple of tracks. For an Extent Space Efficient (ESE) volume we get errors when accessing unformatted tracks. In this case the driver either formats the track on the flight for write requests or returns zero data for read requests. In case a request spans multiple tracks, the indication of an unformatted track presented for the first track is incorrectly applied to all tracks covered by the request. As a result, tracks containing data will be handled as empty, resulting in zero data being returned on read, or overwriting existing data with zero on write. Fix by determining the track that gets the NRF error. For write requests only format the track that is surely not formatted. For Read requests all tracks before have returned valid data and should not be touched. All tracks after the unformatted track might be formatted or not. Those are returned to the blocklayer to build a new request. When using alias devices there is a chance that multiple write requests trigger a format of the same track which might lead to data loss. Ensure that a track is formatted only once by maintaining a list of currently processed tracks. Fixes: 5e2b17e712 ("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> Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-03-18 07:17:52 +01:00
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block	s390/dasd: fix data corruption for thin provisioned devices	2020-03-18 07:17:52 +01:00
char	s390 updates for the 5.4 merge window	2019-09-17 14:04:43 -07:00
cio	s390/qdio: fill SL with absolute addresses	2020-03-12 13:00:15 +01:00
crypto	s390/zcrypt: fix card and queue total counter wrap	2020-03-05 16:43:36 +01:00
net	s390/qdio: fill SL with absolute addresses	2020-03-12 13:00:15 +01:00
scsi	scsi: zfcp: trace channel log even for FCP command responses	2019-12-17 19:55:26 +01:00
virtio	virtio/s390: fix race on airq_areas[]	2019-07-26 13:36:18 +02:00
Makefile	s390: remove pointless drivers-y in drivers/s390/Makefile	2019-09-16 13:21:51 +02:00