[dm-devel] [PATCH RFC 0/2] dm-zoned: add cache device
Hannes Reinecke
hare at suse.de
Mon Mar 23 15:03:50 UTC 2020
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
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