[dm-devel] [patch 1/1] dm_ioctl: use nonseekable_open

[akpm linux-foundation org]

From: Arnd Bergmann <arnd relay de ibm com>

The dm control device does not implement read/write, so it has no use for
seeking.  Using no_llseek prevents falling back to default_llseek, which
requires the BKL.

[fweisbec gmail com: drop useless llseek = no_llseek]
Signed-off-by: Arnd Bergmann <arnd arndb de>
Signed-off-by: Frederic Weisbecker <fweisbec gmail com>
Cc: Alasdair G Kergon <agk redhat com>
Signed-off-by: Andrew Morton <akpm linux-foundation org>
---

 drivers/md/dm-ioctl.c |    1 +
 1 file changed, 1 insertion(+)

diff -puN drivers/md/dm-ioctl.c~dm_ioctl-use-nonseekable_open drivers/md/dm-ioctl.c
--- a/drivers/md/dm-ioctl.c~dm_ioctl-use-nonseekable_open
+++ a/drivers/md/dm-ioctl.c
@@ -1593,6 +1593,7 @@ static long dm_compat_ctl_ioctl(struct f
 #endif
 
 static const struct file_operations _ctl_fops = {
+	.open = nonseekable_open,
 	.unlocked_ioctl	 = dm_ctl_ioctl,
 	.compat_ioctl = dm_compat_ctl_ioctl,
 	.owner	 = THIS_MODULE,
_