dm: keep old table until after resume succeeded
When swapping a new table into place, retain the old table until
its replacement is in place.
An old check for an empty table is removed because this is enforced
in populate_table().
__unbind() becomes redundant when followed by __bind().
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index a3d2026..63fd4de 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -855,7 +855,7 @@
unsigned suspend_flags = DM_SUSPEND_LOCKFS_FLAG;
struct hash_cell *hc;
struct mapped_device *md;
- struct dm_table *new_map;
+ struct dm_table *new_map, *old_map = NULL;
down_write(&_hash_lock);
@@ -884,11 +884,11 @@
if (!dm_suspended(md))
dm_suspend(md, suspend_flags);
- r = dm_swap_table(md, new_map);
- if (r) {
+ old_map = dm_swap_table(md, new_map);
+ if (IS_ERR(old_map)) {
dm_table_destroy(new_map);
dm_put(md);
- return r;
+ return PTR_ERR(old_map);
}
if (dm_table_get_mode(new_map) & FMODE_WRITE)
@@ -900,6 +900,8 @@
if (dm_suspended(md))
r = dm_resume(md);
+ if (old_map)
+ dm_table_destroy(old_map);
if (!r) {
dm_kobject_uevent(md, KOBJ_CHANGE, param->event_nr);