md: Runtime support for multiple ppls

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Increase PPL area to 1MB and use it as circular buffer to store PPL. The
entry with highest generation number is the latest one. If PPL to be
written is larger then space left in a buffer, rewind the buffer to the
start (don't wrap it).

Signed-off-by: Pawel Baldysiak <pawel.baldysiak@intel.com>
Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: Shaohua Li <shli@fb.com>

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Pawel Baldysiak 2017-08-16 17:13:45 +02:00 • committed by Shaohua Li

parent 8a8e6f84ad

commit ddc088238c

7 changed files with 62 additions and 9 deletions

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include/uapi/linux/raid/md_p.h

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