tracing: Allow events to have NULL strings

[platform/adaptation/renesas_rcar/renesas_kernel.git] / fs / mount.h

diff --git a/fs/mount.h b/fs/mount.h
index 64a8581..d64c594 100644 (file)
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -29,6 +29,7 @@ struct mount {
        struct mount *mnt_parent;
        struct dentry *mnt_mountpoint;
        struct vfsmount mnt;
+       struct rcu_head mnt_rcu;
 #ifdef CONFIG_SMP
        struct mnt_pcp __percpu *mnt_pcp;
 #else
@@ -55,7 +56,7 @@ struct mount {
        int mnt_group_id;               /* peer group identifier */
        int mnt_expiry_mark;            /* true if marked for expiry */
        int mnt_pinned;
-       int mnt_ghosts;
+       struct path mnt_ex_mountpoint;
 };
 
 #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
@@ -76,13 +77,28 @@ static inline int is_mounted(struct vfsmount *mnt)
        return !IS_ERR_OR_NULL(real_mount(mnt));
 }
 
-extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *, int);
+extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *);
+extern struct mount *__lookup_mnt_last(struct vfsmount *, struct dentry *);
+
+extern bool legitimize_mnt(struct vfsmount *, unsigned);
 
 static inline void get_mnt_ns(struct mnt_namespace *ns)
 {
        atomic_inc(&ns->count);
 }
 
+extern seqlock_t mount_lock;
+
+static inline void lock_mount_hash(void)
+{
+       write_seqlock(&mount_lock);
+}
+
+static inline void unlock_mount_hash(void)
+{
+       write_sequnlock(&mount_lock);
+}
+
 struct proc_mounts {
        struct seq_file m;
        struct mnt_namespace *ns;