diff options
| author | Jonathan Brassow <jbrassow@redhat.com> | 2009-04-02 22:55:30 +0400 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2009-04-02 22:55:30 +0400 |
| commit | 7513c2a761d69d2a93f17146b3563527d3618ba0 (patch) | |
| tree | 375a14998a60a47b83962d5a497139112ec6e8e4 /lib/rwsem.c | |
| parent | b2a114652940ccf7e9668ad447ca78bf16a31139 (diff) | |
| download | linux-7513c2a761d69d2a93f17146b3563527d3618ba0.tar.xz | |
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>
Diffstat (limited to 'lib/rwsem.c')
0 files changed, 0 insertions, 0 deletions