From: Mike Anderson <andmike@linux.vnet.ibm.com>
Date: Thu, 10 Dec 2009 23:52:20 +0000 (+0000)
Subject: dm ioctl: forbid messages to devices being deleted
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c50abeb38026ea721a812cf8a9b2fac5d3b7684b;p=mv-sheeva.git

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 bf3d19a0fb7..d06dd39856f 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1303,6 +1303,11 @@ static int target_message(struct dm_ioctl *param, size_t param_size)
 	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 @@ static int target_message(struct dm_ioctl *param, size_t param_size)
 		r = -EINVAL;
 	}
 
+ out_table:
 	dm_table_put(table);
  out_argv:
 	kfree(argv);