[PATCH 19/28] VFS: Mountpoint file descriptor expiry support

[Mike Waychison <michael.waychison@sun.com>]

This patch adds support for letting userspcae set the expiry information on a
given mountpoint.

Signed-off-by: Mike Waychison <michael.waychison@sun.com>
---

 fs/mountfd.c       |   10 ++++++++++
 include/linux/fs.h |    1 +
 2 files changed, 11 insertions(+)

Index: linux-2.6.9-quilt/include/linux/fs.h
===================================================================
--- linux-2.6.9-quilt.orig/include/linux/fs.h	2004-10-22 17:17:43.232891744 -0400
+++ linux-2.6.9-quilt/include/linux/fs.h	2004-10-22 17:17:43.766810576 -0400
@@ -228,6 +228,7 @@ extern int leases_enable, dir_notify_ena
 #define MOUNTFD_IOC_GETFSTYPE     _IOR('p', 0xa8, char [MOUNTFD_READSIZE])
 #define MOUNTFD_IOC_GETVFSOPTIONS _IOR('p', 0xa9, char [MOUNTFD_READSIZE])
 #define MOUNTFD_IOC_GETFSOPTIONS  _IOR('p', 0xaa, char [MOUNTFD_READSIZE])
+#define MOUNTFD_IOC_SETVFSEXPIRE  _IOW('p', 0xab, int)
 
 #ifdef __KERNEL__
 
Index: linux-2.6.9-quilt/fs/mountfd.c
===================================================================
--- linux-2.6.9-quilt.orig/fs/mountfd.c	2004-10-22 17:17:43.230892048 -0400
+++ linux-2.6.9-quilt/fs/mountfd.c	2004-10-22 17:17:43.767810424 -0400
@@ -393,6 +393,14 @@ static long mfd_nextchild(struct file *m
 	return ret;
 }
 
+static int mfd_vfsexpire(struct file *mountfilp, int arg)
+{
+	struct vfsmount *mnt;
+
+	mnt = VFSMOUNT(mountfilp);
+	return mnt_expire(mnt, arg);
+}
+
 static int mfd_ioctl_reads(struct inode *inode, struct file *filp,
 		     unsigned int cmd, unsigned long arg)
 {
@@ -455,6 +463,8 @@ static int mfd_ioctl(struct inode *inode
 		return mfd_firstchild(filp);
 	case MOUNTFD_IOC_GETNEXTCHILD:
 		return mfd_nextchild(filp);
+	case MOUNTFD_IOC_SETVFSEXPIRE:
+		return mfd_vfsexpire(filp, (int)arg);
 	}
 	ret = mfd_ioctl_reads(inode, filp, cmd, arg);
 	return ret;