linux-kernel - [PATCH 02/11] uml ubd driver: document some struct fields

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Date:	Sun, 29 Oct 2006 20:20:27 +0100
From:	Paolo 'Blaisorblade' Giarrusso <blaisorblade@...oo.it>
To:	Andrew Morton <akpm@...l.org>
Cc:	Jeff Dike <jdike@...toit.com>,
	user-mode-linux-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: [PATCH 02/11] uml ubd driver: document some struct fields

From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@...oo.it>

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@...oo.it>
---

 arch/um/drivers/ubd_kern.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 984b5da..e034ca4 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -150,8 +150,9 @@ #endif
 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;
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