[PATCH] count ghost references to vfsmounts

make propagate_mount_busy() exclude references from the vfsmounts
that had been isolated by umount_tree() and are just waiting for
release_mounts() to dispose of their ->mnt_parent/->mnt_mountpoint.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/mount.h b/include/linux/mount.h
index 6d3047d8c91c..dac5e67ff3ee 100644
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -61,6 +61,7 @@ struct vfsmount {
         atomic_t mnt_count;
         int mnt_expiry_mark;            /* true if marked for expiry */
         int mnt_pinned;
+        int mnt_ghosts;
 };
 
 static inline struct vfsmount *mntget(struct vfsmount *mnt)