linux-kernel - vfs: Improve readability off mount flag definitins by using offsets

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Date:	Thu, 12 Feb 2009 19:35:20 +0900
From:	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>
To:	Jan Kara <jack@...e.cz>
Cc:	Theodore Tso <tytso@....EDU>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Pavel Machek <pavel@...e.cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>, sandeen@...hat.com,
	fernando@....ac.jp
Subject: vfs: Improve readability off mount flag definitins by using offsets

Currently mount flags are defined using both decimal values and offsets which
is kind of confusing. Define all flags using offsets for the sake of
readability.

Signed-off-by: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
---

diff -urNp linux-2.6.29-rc3-orig/include/linux/fs.h linux-2.6.29-rc3/include/linux/fs.h
--- linux-2.6.29-rc3-orig/include/linux/fs.h	2009-01-29 09:47:51.000000000 +0900
+++ linux-2.6.29-rc3/include/linux/fs.h	2009-01-29 10:01:58.000000000 +0900
@@ -111,22 +111,22 @@ struct inodes_stat_t {
 /*
  * These are the fs-independent mount-flags: up to 32 flags are supported
  */
-#define MS_RDONLY	 1	/* Mount read-only */
-#define MS_NOSUID	 2	/* Ignore suid and sgid bits */
-#define MS_NODEV	 4	/* Disallow access to device special files */
-#define MS_NOEXEC	 8	/* Disallow program execution */
-#define MS_SYNCHRONOUS	16	/* Writes are synced at once */
-#define MS_REMOUNT	32	/* Alter flags of a mounted FS */
-#define MS_MANDLOCK	64	/* Allow mandatory locks on an FS */
-#define MS_DIRSYNC	128	/* Directory modifications are synchronous */
-#define MS_NOATIME	1024	/* Do not update access times. */
-#define MS_NODIRATIME	2048	/* Do not update directory access times */
-#define MS_BIND		4096
-#define MS_MOVE		8192
-#define MS_REC		16384
-#define MS_VERBOSE	32768	/* War is peace. Verbosity is silence.
+#define MS_RDONLY	(1<<0)	/* Mount read-only */
+#define MS_NOSUID	(1<<1)	/* Ignore suid and sgid bits */
+#define MS_NODEV	(1<<2)	/* Disallow access to device special files */
+#define MS_NOEXEC	(1<<3)	/* Disallow program execution */
+#define MS_SYNCHRONOUS	(1<<4)	/* Writes are synced at once */
+#define MS_REMOUNT	(1<<5)	/* Alter flags of a mounted FS */
+#define MS_MANDLOCK	(1<<6)	/* Allow mandatory locks on an FS */
+#define MS_DIRSYNC	(1<<7)	/* Directory modifications are synchronous */
+#define MS_NOATIME	(1<<10)	/* Do not update access times. */
+#define MS_NODIRATIME	(1<<11)	/* Do not update directory access times */
+#define MS_BIND		(1<<12)
+#define MS_MOVE		(1<<13)
+#define MS_REC		(1<<14)
+#define MS_VERBOSE	(1<<15)	/* War is peace. Verbosity is silence.
 				   MS_VERBOSE is deprecated. */
-#define MS_SILENT	32768
+#define MS_SILENT	(1<<15)
 #define MS_POSIXACL	(1<<16)	/* VFS does not apply the umask */
 #define MS_UNBINDABLE	(1<<17)	/* change to unbindable */
 #define MS_PRIVATE	(1<<18)	/* change to private */


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