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dm: allow targets to request flushes regardless of underlying device support

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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>
This commit is contained in:
Joe Thornber
2012-07-27 15:08:07 +01:00
committed by Alasdair G Kergon
parent f4b90369d3
commit 0e9c24ed74
2 changed files with 9 additions and 0 deletions
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3
drivers/md/dm-table.c
View File

@@ -1319,6 +1319,9 @@ static bool dm_table_supports_flush(struct dm_table *t, unsigned flush)
if (!ti->num_flush_requests) if (!ti->num_flush_requests)
continue; continue;
if (ti->flush_supported)
return 1;
if (ti->type->iterate_devices && if (ti->type->iterate_devices &&
ti->type->iterate_devices(ti, device_flush_capable, &flush)) ti->type->iterate_devices(ti, device_flush_capable, &flush))
return 1; return 1;

6
include/linux/device-mapper.h
View File

@@ -211,6 +211,12 @@ struct dm_target {
/* Used to provide an error string from the ctr */ /* Used to provide an error string from the ctr */
char *error; 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 * Set if this target needs to receive discards regardless of
* whether or not its underlying devices have support. * whether or not its underlying devices have support.