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md-cluster: add the support for resize

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To update size for cluster raid, we need to make
sure all nodes can perform the change successfully.
However, it is possible that some of them can't do
it due to failure (bitmap_resize could fail). So
we need to consider the issue before we set the
capacity unconditionally, and we use below steps
to perform sanity check.

1. A change the size, then broadcast METADATA_UPDATED
   msg.
2. B and C receive METADATA_UPDATED change the size
   excepts call set_capacity, sync_size is not update
   if the change failed. Also call bitmap_update_sb
   to sync sb to disk.
3. A checks other node's sync_size, if sync_size has
   been updated in all nodes, then send CHANGE_CAPACITY
   msg otherwise send msg to revert previous change.
4. B and C call set_capacity if receive CHANGE_CAPACITY
   msg, otherwise pers->resize will be called to restore
   the old value.

Reviewed-by: NeilBrown <[email protected]>
Signed-off-by: Guoqing Jiang <[email protected]>
Signed-off-by: Shaohua Li <[email protected]>
This commit is contained in:
Guoqing Jiang 2017-03-01 16:42:40 +08:00 • committed by Shaohua Li
commit 818da59f97
4 changed files with 94 additions and 6 deletions
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2
Documentation/md/md-cluster.txt
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@ -321,4 +321,4 @@ The algorithm is:
There are somethings which are not supported by cluster MD yet.
- update size and change array_sectors.
- change array_sectors.