Motivation: dm-zoned exposes a zoned block device(ZBC) as a regular block device by storing metadata and buffering random writes in its conventional zones. This way is not flexible, there must be enough conventional zones and the performance may be constrained. This patchset split the metadata from zoned device to an extra regular device, with aim to increase the flexibility and potential performance. For example, now we can store metadata in a faster device like persistent memory. Also random writes can go to the regular devices in this version. Usage(will send user space patches later): > dmzadm --format $zoned_dev --regular=$regu_dev --force > echo "0 $size zoned $regu_dev $zoned_dev" | dmsetup create $dm-zoned-name v2: * emulate regular device zone info * support write both metadata and random writes to regular dev Bob Liu (3): dm zoned: rename dev name to zoned_dev dm zoned: introduce regular device to dm-zoned-target dm zoned: add regular device info to metadata drivers/md/dm-zoned-metadata.c | 205 +++++++++++++++++++++++++++-------------- drivers/md/dm-zoned-target.c | 205 +++++++++++++++++++++++------------------ drivers/md/dm-zoned.h | 53 ++++++++++- 3 files changed, 299 insertions(+), 164 deletions(-) -- 2.9.5
