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-rw-r--r--sys/sys/mdioctl.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/sys/mdioctl.h b/sys/sys/mdioctl.h
index 3ba206b6aa9a..861619b3b8cb 100644
--- a/sys/sys/mdioctl.h
+++ b/sys/sys/mdioctl.h
@@ -90,5 +90,6 @@ struct md_ioctl {
#define MD_READONLY 0x08 /* Readonly mode */
#define MD_COMPRESS 0x10 /* Compression mode */
#define MD_FORCE 0x20 /* Don't try to prevent foot-shooting */
+#define MD_ASYNC 0x40 /* Don't try to prevent foot-shooting */
#endif /* _SYS_MDIOCTL_H_*/