From 0e9c24ed7443d090e369a2eddfa13f7f0b5afbaf Mon Sep 17 00:00:00 2001 From: Joe Thornber Date: Fri, 27 Jul 2012 15:08:07 +0100 Subject: [PATCH] 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 Signed-off-by: Mike Snitzer Signed-off-by: Alasdair G Kergon --- drivers/md/dm-table.c | 3 +++ include/linux/device-mapper.h | 6 ++++++ 2 files changed, 9 insertions(+) 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 @@ -211,6 +211,12 @@ struct dm_target { /* Used to provide an error string from the ctr */ 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. -- 2.39.5