Upgrade to 4.4.50-rt62

[kvmfornfv.git] / kernel / include / linux / dcache.h

diff --git a/kernel/include/linux/dcache.h b/kernel/include/linux/dcache.h
index 8a2e009..8d7151e 100644 (file)
--- a/kernel/include/linux/dcache.h
+++ b/kernel/include/linux/dcache.h
@@ -161,6 +161,7 @@ struct dentry_operations {
        struct vfsmount *(*d_automount)(struct path *);
        int (*d_manage)(struct dentry *, bool);
        struct inode *(*d_select_inode)(struct dentry *, unsigned);
+       struct dentry *(*d_real)(struct dentry *, struct inode *);
 } ____cacheline_aligned;
 
 /*
@@ -227,6 +228,7 @@ struct dentry_operations {
 #define DCACHE_MAY_FREE                        0x00800000
 #define DCACHE_FALLTHRU                        0x01000000 /* Fall through to lower layer */
 #define DCACHE_OP_SELECT_INODE         0x02000000 /* Unioned entry: dcache op selects inode */
+#define DCACHE_OP_REAL                 0x08000000
 
 extern seqlock_t rename_lock;
 
@@ -582,4 +584,36 @@ static inline struct dentry *d_backing_dentry(struct dentry *upper)
        return upper;
 }
 
+static inline struct dentry *d_real(struct dentry *dentry)
+{
+       if (unlikely(dentry->d_flags & DCACHE_OP_REAL))
+               return dentry->d_op->d_real(dentry, NULL);
+       else
+               return dentry;
+}
+
+static inline struct inode *vfs_select_inode(struct dentry *dentry,
+                                            unsigned open_flags)
+{
+       struct inode *inode = d_inode(dentry);
+
+       if (inode && unlikely(dentry->d_flags & DCACHE_OP_SELECT_INODE))
+               inode = dentry->d_op->d_select_inode(dentry, open_flags);
+
+       return inode;
+}
+
+/**
+ * d_real_inode - Return the real inode
+ * @dentry: The dentry to query
+ *
+ * If dentry is on an union/overlay, then return the underlying, real inode.
+ * Otherwise return d_inode().
+ */
+static inline struct inode *d_real_inode(struct dentry *dentry)
+{
+       return d_backing_inode(d_real(dentry));
+}
+
+
 #endif /* __LINUX_DCACHE_H */