aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/md
diff options
context:
space:
mode:
authorMike Snitzer <snitzer@redhat.com>2014-10-28 20:13:31 -0400
committerMike Snitzer <snitzer@redhat.com>2014-11-19 11:24:59 -0500
commitd67ee213fa5700c7da526fe5bcccd485cfa63d8b (patch)
tree9ba735535bac6b904191702006275ec8115d9803 /drivers/md
parent4d341d8216336174d35cd2575b6b9e4267a88ac8 (diff)
dm: add presuspend_undo hook to target_type
The DM thin-pool target now must undo the changes performed during pool_presuspend() so introduce presuspend_undo hook in target_type. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Acked-by: Joe Thornber <ejt@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-table.c36
-rw-r--r--drivers/md/dm.c10
-rw-r--r--drivers/md/dm.h1
3 files changed, 38 insertions, 9 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index b2bd1ebf4562..3afae9e062f8 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1521,18 +1521,32 @@ fmode_t dm_table_get_mode(struct dm_table *t)
}
EXPORT_SYMBOL(dm_table_get_mode);
-static void suspend_targets(struct dm_table *t, unsigned postsuspend)
+enum suspend_mode {
+ PRESUSPEND,
+ PRESUSPEND_UNDO,
+ POSTSUSPEND,
+};
+
+static void suspend_targets(struct dm_table *t, enum suspend_mode mode)
{
int i = t->num_targets;
struct dm_target *ti = t->targets;
while (i--) {
- if (postsuspend) {
+ switch (mode) {
+ case PRESUSPEND:
+ if (ti->type->presuspend)
+ ti->type->presuspend(ti);
+ break;
+ case PRESUSPEND_UNDO:
+ if (ti->type->presuspend_undo)
+ ti->type->presuspend_undo(ti);
+ break;
+ case POSTSUSPEND:
if (ti->type->postsuspend)
ti->type->postsuspend(ti);
- } else if (ti->type->presuspend)
- ti->type->presuspend(ti);
-
+ break;
+ }
ti++;
}
}
@@ -1542,7 +1556,15 @@ void dm_table_presuspend_targets(struct dm_table *t)
if (!t)
return;
- suspend_targets(t, 0);
+ suspend_targets(t, PRESUSPEND);
+}
+
+void dm_table_presuspend_undo_targets(struct dm_table *t)
+{
+ if (!t)
+ return;
+
+ suspend_targets(t, PRESUSPEND_UNDO);
}
void dm_table_postsuspend_targets(struct dm_table *t)
@@ -1550,7 +1572,7 @@ void dm_table_postsuspend_targets(struct dm_table *t)
if (!t)
return;
- suspend_targets(t, 1);
+ suspend_targets(t, POSTSUSPEND);
}
int dm_table_resume_targets(struct dm_table *t)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index f8cdd97c28a7..f84de3215982 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2756,7 +2756,10 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
if (noflush)
set_bit(DMF_NOFLUSH_SUSPENDING, &md->flags);
- /* This does not get reverted if there's an error later. */
+ /*
+ * This gets reverted if there's an error later and the targets
+ * provide the .presuspend_undo hook.
+ */
dm_table_presuspend_targets(map);
/*
@@ -2767,8 +2770,10 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
*/
if (!noflush && do_lockfs) {
r = lock_fs(md);
- if (r)
+ if (r) {
+ dm_table_presuspend_undo_targets(map);
goto out_unlock;
+ }
}
/*
@@ -2816,6 +2821,7 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
start_queue(md->queue);
unlock_fs(md);
+ dm_table_presuspend_undo_targets(map);
goto out_unlock; /* pushback list is already flushed, so skip flush */
}
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index 988c7fb7b145..781994093bf5 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -65,6 +65,7 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
struct queue_limits *limits);
struct list_head *dm_table_get_devices(struct dm_table *t);
void dm_table_presuspend_targets(struct dm_table *t);
+void dm_table_presuspend_undo_targets(struct dm_table *t);
void dm_table_postsuspend_targets(struct dm_table *t);
int dm_table_resume_targets(struct dm_table *t);
int dm_table_any_congested(struct dm_table *t, int bdi_bits);

Privacy Policy