Hi all, this patchset adds a new metadata version 2 for dm-zoned, which brings the following improvements: - UUIDs and labels: Adding three more fields to the metadata containing the dm-zoned device UUID and label, and the device UUID. This allows for an unique identification of the devices, so that several dm-zoned sets can coexist and have a persistent identification. - Extend random zones by an additional regular disk device: A regular block device can be added together with the zoned block device, providing additional (emulated) random write zones. With this it's possible to handle sequential zones only devices; also there will be a speed-up if the regular block device resides on a fast medium. The regular block device is placed logically in front of the zoned block device, so that metadata and mapping tables reside on the regular block device, not the zoned device. - Tertiary superblock support: In addition to the two existing sets of metadata another, tertiary, superblock is written to the first block of the zoned block device. This superblock is for identification only; the generation number is set to '0' and the block itself it never updated. The addition metadate like bitmap tables etc are not copied. To handle this, some changes to the original handling are introduced: - Zones are now equidistant. Originally, runt zones were ignored, and not counted when sizing the mapping tables. With the dual device setup runt zones might occur at the end of the regular block device, making direct translation between zone number and sector/block number complex. For metadata version 2 all zones are considered to be of the same size, and runt zones are simply marked as 'offline' to have them ignored when allocating a new zone. - The block number in the superblock is now the global number, and refers to the location of the superblock relative to the resulting device-mapper device. Which means that the tertiary superblock contains absolute block addresses, which needs to be translated to the relative device addresses to find the referenced block. There is an accompanying patchset for dm-zoned-tools for writing and checking this new metadata. As usual, comments and reviews are welcome. Changes to v5: - Separate 'message' and 'status' into separate patches as suggested by Mike Snitzer - Update documentation to reflect the new functionality as suggested by Mike Snitzer - Add review tags from Damien Changes to v4: - Add reviews from Damien - Silence logging output as suggested by Mike Snitzer - Fixup compilation on 32bit archs Changes to v3: - Reorder devices such that the regular device is always at position 0, and the zoned device is always at position 1. - Split off dmz_dev_is_dying() into a separate patch - Include reviews from Damien Changes to v2: - Kill dmz_id() - Include reviews from Damien - Sanitize uuid handling as suggested by John Dorminy Hannes Reinecke (15): dm-zoned: add 'status' callback dm-zoned: add 'message' callback dm-zoned: store zone id within the zone structure and kill dmz_id() dm-zoned: use array for superblock zones dm-zoned: store device in struct dmz_sb dm-zoned: move fields from struct dmz_dev to dmz_metadata dm-zoned: introduce dmz_metadata_label() to format device name dm-zoned: Introduce dmz_dev_is_dying() and dmz_check_dev() dm-zoned: remove 'dev' argument from reclaim dm-zoned: replace 'target' pointer in the bio context dm-zoned: use dmz_zone_to_dev() when handling metadata I/O dm-zoned: add metadata logging functions dm-zoned: Reduce logging output on startup dm-zoned: ignore metadata zone in dmz_alloc_zone() dm-zoned: metadata version 2 .../admin-guide/device-mapper/dm-zoned.rst | 62 +- drivers/md/dm-zoned-metadata.c | 664 ++++++++++++++++----- drivers/md/dm-zoned-reclaim.c | 88 +-- drivers/md/dm-zoned-target.c | 376 ++++++++---- drivers/md/dm-zoned.h | 35 +- 5 files changed, 880 insertions(+), 345 deletions(-) -- 2.16.4 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
