tree 375a14998a60a47b83962d5a497139112ec6e8e4
parent b2a114652940ccf7e9668ad447ca78bf16a31139
author Jonathan Brassow <jbrassow@redhat.com> 1238698530 +0100
committer Alasdair G Kergon <agk@redhat.com> 1238698530 +0100

dm raid1: add is_remote_recovering hook for clusters

The logging API needs an extra function to make cluster mirroring
possible.  This new function allows us to check whether a mirror
region is being recovered on another machine in the cluster.  This
helps us prevent simultaneous recovery I/O and process I/O to the
same locations on disk.

Cluster-aware log modules will implement this function.  Single
machine log modules will not.  So, there is no performance
penalty for single machine mirrors.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Acked-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>