md/raid5: prepare for allowing reshape to change chunksize.

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Add "prev_chunk" to raid5_conf_t, similar to "previous_raid_disks", to
remember what the chunk size was before the reshape that is currently
underway.

This seems like duplication with "chunk_size" and "new_chunk" in
mddev_t, and to some extent it is, but there are differences.
The values in mddev_t are always defined and often the same.
The prev* values are only defined if a reshape is underway.

Also (and more significantly) the raid5_conf_t values will be changed
at the same time (inside an appropriate lock) that the reshape is
started by setting reshape_position.  In contrast, the new_chunk value
is set when the sysfs file is written which could be well before the
reshape starts.

Signed-off-by: NeilBrown <neilb@suse.de>

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This commit is contained in:

NeilBrown 2009-03-31 15:19:07 +11:00

parent 86b42c713b

commit 784052ecc6

2 changed files with 28 additions and 16 deletions

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43

drivers/md/raid5.c

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1

drivers/md/raid5.h

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