[PATCH] uml ubd driver: document some struct fields

Add documentation about some fields in struct ubd, whose meaning is
non-obvious due to struct names (should change names altogether, I agree).

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 54d24738280e..e104f59ec519 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -150,8 +150,9 @@ static struct gendisk *fake_gendisk[MAX_DEV];
 static struct openflags global_openflags = OPEN_FLAGS;
 
 struct cow {
-        /* This is the backing file, actually */
+        /* backing file name */
         char *file;
+        /* backing file fd */
         int fd;
         unsigned long *bitmap;
         unsigned long bitmap_len;
@@ -160,6 +161,8 @@ struct cow {
 };
 
 struct ubd {
+        /* name (and fd, below) of the file opened for writing, either the
+         * backing or the cow file. */
         char *file;
         int count;
         int fd;