dm ioctl: forbid messages to devices being deleted
Once we begin deleting a device, prevent any further messages being sent
to targets of its table (to avoid races).
Signed-off-by: Mike Anderson <andmike@linux.vnet.ibm.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index bf3d19a..d06dd39 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1303,6 +1303,11 @@
if (!table)
goto out_argv;
+ if (dm_deleting_md(md)) {
+ r = -ENXIO;
+ goto out_table;
+ }
+
ti = dm_table_find_target(table, tmsg->sector);
if (!dm_target_is_valid(ti)) {
DMWARN("Target message sector outside device.");
@@ -1314,6 +1319,7 @@
r = -EINVAL;
}
+ out_table:
dm_table_put(table);
out_argv:
kfree(argv);