Hi Damien, as my original plan to upgrade bcache to work for SMR devices turned out to be more complex than anticipated I went for the simpler approach and added a 'cache' device for dm-zoned. It is using a normal device (eg '/dev/pmem0' :-), split it into zones of the same size of the original SMR device, and makes those 'virtual' zones avialable to dm-zoned in a similar manner than the existing 'random write' zoned. The implementation is still a bit rough (one would need to add metadata to the cache device, too), but so far it seems to work quite well; still running after copying 300GB of data back and forth. As usual, comments and reviews are welcome. Hannes Reinecke (2): dm-zoned: cache device for zones dm-zoned: add 'status' and 'message' callbacks drivers/md/dm-zoned-metadata.c | 189 +++++++++++++++++++++++++++++---- drivers/md/dm-zoned-reclaim.c | 76 ++++++++++--- drivers/md/dm-zoned-target.c | 159 ++++++++++++++++++++++++--- drivers/md/dm-zoned.h | 34 +++++- 4 files changed, 407 insertions(+), 51 deletions(-) -- 2.25.0 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
