md-cluster: introduce cluster_check_sync_size

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Support resize is a little complex for clustered
raid, since we need to ensure all the nodes share
the same knowledge about the size of raid.

We achieve the goal by check the sync_size which
is in each node's bitmap, we can only change the
capacity after cluster_check_sync_size returns 0.

Also, get_bitmap_from_slot is added to get a slot's
bitmap. And we exported some funcs since they are
used in cluster_check_sync_size().

We can also reuse get_bitmap_from_slot to remove
redundant code existed in bitmap_copy_from_slot.

Reviewed-by: NeilBrown <neilb@suse.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>

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Guoqing Jiang 2017-03-01 16:42:39 +08:00 • committed by Shaohua Li

parent 7da3d20333

commit b98938d16a

3 changed files with 93 additions and 10 deletions

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41

drivers/md/bitmap.c

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2

drivers/md/bitmap.h

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60

drivers/md/md-cluster.c

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