fs: Remove i_cindex from struct inode
The only user of the i_cindex element in the inode structure is used
is by the firewire drivers. As part of an attempt to slim down the
inode structure to save memory --- since a typical Linux system will
have hundreds of thousands if not millions of inodes cached, a
reduction in the size inode has high leverage.
The firewire driver does not need i_cindex in any fast path, so it's
simple enough to calculate when it is needed, instead of wasting space
in the inode structure.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: krh@redhat.com
Cc: stefanr@s5r6.in-berlin.de
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/ieee1394/ieee1394_core.h b/drivers/ieee1394/ieee1394_core.h
index 21d50f7..28b9f58 100644
--- a/drivers/ieee1394/ieee1394_core.h
+++ b/drivers/ieee1394/ieee1394_core.h
@@ -5,6 +5,7 @@
#include <linux/fs.h>
#include <linux/list.h>
#include <linux/types.h>
+#include <linux/cdev.h>
#include <asm/atomic.h>
#include "hosts.h"
@@ -155,7 +156,10 @@
*/
static inline unsigned char ieee1394_file_to_instance(struct file *file)
{
- return file->f_path.dentry->d_inode->i_cindex;
+ int idx = cdev_index(file->f_path.dentry->d_inode);
+ if (idx < 0)
+ idx = 0;
+ return idx;
}
extern int hpsb_disable_irm;