dm snapshot: use DMEMIT macro for status

Use DMEMIT in place of snprintf.  This makes it easier later when
other modules are helping to populate our status output.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

1 files changed, 10 insertions, 9 deletions

diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index bb28f9782bdd..fcb1ac12119f 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -1214,24 +1214,25 @@ static void snapshot_resume(struct dm_target *ti)
 static int snapshot_status(struct dm_target *ti, status_type_t type,
                            char *result, unsigned int maxlen)
 {
+        unsigned sz = 0;
         struct dm_snapshot *snap = ti->private;
 
         switch (type) {
         case STATUSTYPE_INFO:
                 if (!snap->valid)
-                        snprintf(result, maxlen, "Invalid");
+                        DMEMIT("Invalid");
                 else {
                         if (snap->store->type->fraction_full) {
                                 sector_t numerator, denominator;
                                 snap->store->type->fraction_full(snap->store,
                                                                  &numerator,
                                                                  &denominator);
-                                snprintf(result, maxlen, "%llu/%llu",
-                                        (unsigned long long)numerator,
-                                        (unsigned long long)denominator);
+                                DMEMIT("%llu/%llu",
+                                       (unsigned long long)numerator,
+                                       (unsigned long long)denominator);
                         }
                         else
-                                snprintf(result, maxlen, "Unknown");
+                                DMEMIT("Unknown");
                 }
                 break;
 
@@ -1241,10 +1242,10 @@ static int snapshot_status(struct dm_target *ti, status_type_t type,
                  * to make private copies if the output is to
                  * make sense.
                  */
-                snprintf(result, maxlen, "%s %s %s %llu",
-                         snap->origin->name, snap->store->cow->name,
-                         snap->store->type->name,
-                         (unsigned long long)snap->store->chunk_size);
+                DMEMIT("%s", snap->origin->name);
+                DMEMIT(" %s %s %llu", snap->store->cow->name,
+                       snap->store->type->name,
+                       (unsigned long long)snap->store->chunk_size);
                 break;
         }