dm raid: enhance status interface and fixup takeover/raid0
The target's status interface has to provide the new 'data_offset' value to allow userspace to retrieve the kernels offset to the data on each raid device of a raid set. This is the base for out-of-place reshaping required to not write over any data during reshaping (e.g. change raid6_zr -> raid6_nc): - add rs_set_cur() to be able to start up existing array in case of no takeover; use in ctr on takeover check - enhance raid_status() - add supporting functions to get resync/reshape progress and raid device status chars - fixup rebuild table line output race, which does miss to emit 'rebuild N' on fully synced/rebuild devices, because it is relying on the transient 'In_sync' raid device flag - add new status line output for 'data_offset', which'll later be used for out-of-place reshaping - fixup takeover not working for all levels - fixup raid0 message interface oops caused by missing checks for the md threads, which don't exist in case of raid0 - remove ALL_FREEZE_FLAGS not needed for takeover - adjust comments Signed-off-by:Heinz Mauelshagen <heinzm@redhat.com> Signed-off-by:
Mike Snitzer <snitzer@redhat.com>
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