linux-kernel - [PATCH 3/4] sysfs: Store the sysfs inode in an unsigned int.

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Date:	Sun, 18 Dec 2011 20:08:16 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	<linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	Mikulas Patocka <mpatocka@...hat.com>
Subject: [PATCH 3/4] sysfs: Store the sysfs inode in an unsigned int.


Store the sysfs inode number in an unsided int because
ida inode allocator can return at most a 31 bit number,
reducing the size of struct sysfs_dirent by 8 bytes
on 64bit platforms.

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 fs/sysfs/dir.c   |    4 ++--
 fs/sysfs/sysfs.h |    2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 0daf255..0589c9a 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -224,7 +224,7 @@ static void sysfs_deactivate(struct sysfs_dirent *sd)
 	rwsem_release(&sd->dep_map, 1, _RET_IP_);
 }
 
-static int sysfs_alloc_ino(ino_t *pino)
+static int sysfs_alloc_ino(unsigned int *pino)
 {
 	int ino, rc;
 
@@ -243,7 +243,7 @@ static int sysfs_alloc_ino(ino_t *pino)
 	return rc;
 }
 
-static void sysfs_free_ino(ino_t ino)
+static void sysfs_free_ino(unsigned int ino)
 {
 	spin_lock(&sysfs_ino_lock);
 	ida_remove(&sysfs_ino_ida, ino);
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index e10ff98..3f23061 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -79,7 +79,7 @@ struct sysfs_dirent {
 
 	unsigned short		s_flags;
 	unsigned short		s_mode;
-	ino_t			s_ino;
+	unsigned int		s_ino;
 	struct sysfs_inode_attrs *s_iattr;
 };
 
-- 
1.7.2.5

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