dm ioctl: support cookies for udev

[karo-tx-linux.git] / include / linux / dm-ioctl.h

diff --git a/include/linux/dm-ioctl.h b/include/linux/dm-ioctl.h
index 48e44ee2b466b1a0da649057af1cbb5402dd61b4..2ab84c83c31a9d7d11b8c18ee744cb85ca520fd8 100644 (file)
--- a/include/linux/dm-ioctl.h
+++ b/include/linux/dm-ioctl.h
@@ -123,6 +123,16 @@ struct dm_ioctl {
        __u32 target_count;     /* in/out */
        __s32 open_count;       /* out */
        __u32 flags;            /* in/out */
+
+       /*
+        * event_nr holds either the event number (input and output) or the
+        * udev cookie value (input only).
+        * The DM_DEV_WAIT ioctl takes an event number as input.
+        * The DM_SUSPEND, DM_DEV_REMOVE and DM_DEV_RENAME ioctls
+        * use the field as a cookie to return in the DM_COOKIE
+        * variable with the uevents they issue.
+        * For output, the ioctls return the event number, not the cookie.
+        */
        __u32 event_nr;         /* in/out */
        __u32 padding;
 
@@ -256,9 +266,9 @@ enum {
 #define DM_DEV_SET_GEOMETRY    _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
 
 #define DM_VERSION_MAJOR       4
-#define DM_VERSION_MINOR       14
+#define DM_VERSION_MINOR       15
 #define DM_VERSION_PATCHLEVEL  0
-#define DM_VERSION_EXTRA       "-ioctl (2008-04-23)"
+#define DM_VERSION_EXTRA       "-ioctl (2009-04-01)"
 
 /* Status bits */
 #define DM_READONLY_FLAG       (1 << 0) /* In/Out */