This series contains a few patches aimed to make dm-zoned properly handle backing zoned storage device failures. The following test environment was used to trigger device failures: A 100% write file I/O fio workload was run against an XFS volume created on top of a dm-zoned target device. The dm-zoned device, in turn, was created on top of a zoned device provisioned by tcmu-runner ZBC file handler. The backing storage file for the tcmu-runner handler has been created on a separate ext4 file system. Two different failure modes were tested - 1. Removal of the tcmu-runner device under I/O 2. Complete failure of the backing storage of tcmu-runner under I/O In both of these test cases, dm-zoned has been observed to hang and the only possible remedy to recover from that state was to reboot the test system. The fio test script would also hang forever. With these patches in place, the test script properly reports the error and exits. After that, it is possible to remove the dm-zoned target device and then recreate it with some working backup storage without rebooting the system. Dmitry Fomichev (3): dm-zoned: improve error handling in reclaim dm-zoned: improve error handling in i/o map code dm-zoned: properly handle backing device failure drivers/md/dm-zoned-metadata.c | 55 ++++++++++++++++++++------ drivers/md/dm-zoned-reclaim.c | 44 ++++++++++++++++----- drivers/md/dm-zoned-target.c | 72 ++++++++++++++++++++++++++++++---- drivers/md/dm-zoned.h | 10 +++++ 4 files changed, 151 insertions(+), 30 deletions(-) -- 2.21.0 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
