dm log: report fault status

This patch reports the status of the log device so that userspace can detect
the error and take appropriate action.

Signed-off-by: Jonathan E Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 11 insertions, 7 deletions

diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index a503d12c2ff8..8d301409d814 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -615,6 +615,7 @@ static int core_status(struct dirty_log *log, status_type_t status,
 
         switch(status) {
         case STATUSTYPE_INFO:
+                DMEMIT("1 %s", log->type->name);
                 break;
 
         case STATUSTYPE_TABLE:
@@ -630,17 +631,17 @@ static int disk_status(struct dirty_log *log, status_type_t status,
                        char *result, unsigned int maxlen)
 {
         int sz = 0;
-        char buffer[16];
         struct log_c *lc = log->context;
 
         switch(status) {
         case STATUSTYPE_INFO:
+                DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name,
+                       lc->log_dev_failed ? 'D' : 'A');
                 break;
 
         case STATUSTYPE_TABLE:
-                format_dev_t(buffer, lc->log_dev->bdev->bd_dev);
                 DMEMIT("%s %u %s %u ", log->type->name,
-                       lc->sync == DEFAULTSYNC ? 2 : 3, buffer,
+                       lc->sync == DEFAULTSYNC ? 2 : 3, lc->log_dev->name,
                        lc->region_size);
                 DMEMIT_SYNC;
         }
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index c8b4c108da9e..cb3f318a3692 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -1205,11 +1205,9 @@ static void mirror_resume(struct dm_target *ti)
 static int mirror_status(struct dm_target *ti, status_type_t type,
                          char *result, unsigned int maxlen)
 {
-        unsigned int m, sz;
+        unsigned int m, sz = 0;
         struct mirror_set *ms = (struct mirror_set *) ti->private;
 
-        sz = ms->rh.log->type->status(ms->rh.log, type, result, maxlen);
-
         switch (type) {
         case STATUSTYPE_INFO:
                 DMEMIT("%d ", ms->nr_mirrors);
@@ -1220,9 +1218,14 @@ static int mirror_status(struct dm_target *ti, status_type_t type,
                         (unsigned long long)ms->rh.log->type->
                                 get_sync_count(ms->rh.log),
                         (unsigned long long)ms->nr_regions);
+
+                sz = ms->rh.log->type->status(ms->rh.log, type, result, maxlen);
+
                 break;
 
         case STATUSTYPE_TABLE:
+                sz = ms->rh.log->type->status(ms->rh.log, type, result, maxlen);
+
                 DMEMIT("%d", ms->nr_mirrors);
                 for (m = 0; m < ms->nr_mirrors; m++)
                         DMEMIT(" %s %llu", ms->mirror[m].dev->name,
@@ -1234,7 +1237,7 @@ static int mirror_status(struct dm_target *ti, status_type_t type,
 
 static struct target_type mirror_target = {
         .name    = "mirror",
-        .version = {1, 0, 2},
+        .version = {1, 0, 3},
         .module  = THIS_MODULE,
         .ctr     = mirror_ctr,
         .dtr     = mirror_dtr,