dm thin: commit before gathering status

Commit outstanding metadata before returning the status for a dm thin
pool so that the numbers reported are as up-to-date as possible.

The commit is not performed if the device is suspended or if
the DM_NOFLUSH_FLAG is supplied by userspace and passed to the target
through a new 'status_flags' parameter in the target's dm_status_fn.

The userspace dmsetup tool will support the --noflush flag with the
'dmsetup status' and 'dmsetup wait' commands from version 1.02.76
onwards.

Tested-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 6c0f3e33923a..a143921feaf6 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -1849,7 +1849,7 @@ static void snapshot_merge_resume(struct dm_target *ti)
 }
 
 static int snapshot_status(struct dm_target *ti, status_type_t type,
-                           char *result, unsigned int maxlen)
+                           unsigned status_flags, char *result, unsigned maxlen)
 {
         unsigned sz = 0;
         struct dm_snapshot *snap = ti->private;
@@ -2151,8 +2151,8 @@ static void origin_resume(struct dm_target *ti)
         ti->max_io_len = get_origin_minimum_chunksize(dev->bdev);
 }
 
-static int origin_status(struct dm_target *ti, status_type_t type, char *result,
-                         unsigned int maxlen)
+static int origin_status(struct dm_target *ti, status_type_t type,
+                         unsigned status_flags, char *result, unsigned maxlen)
 {
         struct dm_dev *dev = ti->private;