linux-kernel - [PATCH 1/3] sysfs: Compact sysfs_dirent s

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Date:	Thu, 08 Mar 2012 13:34:22 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jiri Slaby <jslaby@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jiri Slaby <jirislaby@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	LKML <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Maciej Rutecki <maciej.rutecki@...il.com>
Subject: [PATCH 1/3] sysfs:  Compact sysfs_dirent s_flags into a byte.


In an effort to keep sysfs_dirent small used the smallest
basic type I can for sysfs s_flags.

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 fs/sysfs/sysfs.h |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index 6289a00..c76c932 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -76,7 +76,7 @@ struct sysfs_dirent {
 		struct sysfs_elem_bin_attr	s_bin_attr;
 	};
 
-	unsigned short		s_flags;
+	unsigned char		s_flags;
 	umode_t 		s_mode;
 	unsigned int		s_ino;
 	struct sysfs_inode_attrs *s_iattr;
@@ -84,7 +84,7 @@ struct sysfs_dirent {
 
 #define SD_DEACTIVATED_BIAS		INT_MIN
 
-#define SYSFS_TYPE_MASK			0x00ff
+#define SYSFS_TYPE_MASK			0x000f
 #define SYSFS_DIR			0x0001
 #define SYSFS_KOBJ_ATTR			0x0002
 #define SYSFS_KOBJ_BIN_ATTR		0x0004
@@ -93,11 +93,11 @@ struct sysfs_dirent {
 #define SYSFS_ACTIVE_REF		(SYSFS_KOBJ_ATTR | SYSFS_KOBJ_BIN_ATTR)
 
 /* identify any namespace tag on sysfs_dirents */
-#define SYSFS_NS_TYPE_MASK		0xf00
-#define SYSFS_NS_TYPE_SHIFT		8
+#define SYSFS_NS_TYPE_MASK		0x70
+#define SYSFS_NS_TYPE_SHIFT		4
 
 #define SYSFS_FLAG_MASK			~(SYSFS_NS_TYPE_MASK|SYSFS_TYPE_MASK)
-#define SYSFS_FLAG_REMOVED		0x02000
+#define SYSFS_FLAG_REMOVED		0x080
 
 static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
 {
-- 
1.7.2.5

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