diff options
| author | Joe Thornber | 2012-07-27 15:08:07 +0100 |
|---|---|---|
| committer | Alasdair G Kergon | 2012-07-27 15:08:07 +0100 |
| commit | 0e9c24ed7443d090e369a2eddfa13f7f0b5afbaf (patch) | |
| tree | 707aed84bf17ee82bb32bb26e776b97afb3493fe | |
| parent | f4b90369d3a9ffe0f48f373c566578c142e95bf2 (diff) | |
dm: allow targets to request flushes regardless of underlying device support
Allow targets to override the 'supports flush' calculation.
Set 'flush_supported' if a target needs to receive flushes regardless of
whether or not its underlying devices have support.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| -rw-r--r-- | drivers/md/dm-table.c | 3 | ||||
| -rw-r--r-- | include/linux/device-mapper.h | 6 |
2 files changed, 9 insertions, 0 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 2e227fbf1622..f90069029aae 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1319,6 +1319,9 @@ static bool dm_table_supports_flush(struct dm_table *t, unsigned flush) if (!ti->num_flush_requests) continue; + if (ti->flush_supported) + return 1; + if (ti->type->iterate_devices && ti->type->iterate_devices(ti, device_flush_capable, &flush)) return 1; diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index 8bdbbfce759a..bdd65e97a129 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -212,6 +212,12 @@ struct dm_target { char *error; /* + * Set if this target needs to receive flushes regardless of + * whether or not its underlying devices have support. + */ + bool flush_supported:1; + + /* * Set if this target needs to receive discards regardless of * whether or not its underlying devices have support. */ |