X-Git-Url: https://git.camperquake.de/gitweb.cgi?a=blobdiff_plain;f=include%2Flinux%2Fdcache_compat.h;h=2b9e5c1c405095cd7b11e4ae8a0a953d58557846;hb=refs%2Fheads%2Frertzinger%2Ffeature-zpool-get--p;hp=a42356276a045d86bfdcabfad66b9d9c7a11e309;hpb=6a0936babc14a44986265a12f206c41999bd48c3;p=zfs.git

diff --git a/include/linux/dcache_compat.h b/include/linux/dcache_compat.h
index a423562..2b9e5c1 100644
--- a/include/linux/dcache_compat.h
+++ b/include/linux/dcache_compat.h
@@ -35,4 +35,49 @@
 #define d_make_root(inode)	d_alloc_root(inode)
 #endif /* HAVE_D_MAKE_ROOT */
 
+/*
+ * 2.6.30 API change,
+ * The const keyword was added to the 'struct dentry_operations' in
+ * the dentry structure.  To handle this we define an appropriate
+ * dentry_operations_t typedef which can be used.
+ */
+#ifdef HAVE_CONST_DENTRY_OPERATIONS
+typedef const struct dentry_operations	dentry_operations_t;
+#else
+typedef struct dentry_operations	dentry_operations_t;
+#endif
+
+/*
+ * 2.6.38 API change,
+ * Added d_set_d_op() helper function which sets some flags in
+ * dentry->d_flags based on which operations are defined.
+ */
+#ifndef HAVE_D_SET_D_OP
+static inline void
+d_set_d_op(struct dentry *dentry, dentry_operations_t *op)
+{
+	dentry->d_op = op;
+}
+#endif /* HAVE_D_SET_D_OP */
+
+/*
+ * 2.6.38 API addition,
+ * Added d_clear_d_op() helper function which clears some flags and the
+ * registered dentry->d_op table.  This is required because d_set_d_op()
+ * issues a warning when the dentry operations table is already set.
+ * For the .zfs control directory to work properly we must be able to
+ * override the default operations table and register custom .d_automount
+ * and .d_revalidate callbacks.
+ */
+static inline void
+d_clear_d_op(struct dentry *dentry)
+{
+#ifdef HAVE_D_SET_D_OP
+	dentry->d_op = NULL;
+	dentry->d_flags &=
+	    ~(DCACHE_OP_HASH | DCACHE_OP_COMPARE |
+	      DCACHE_OP_REVALIDATE | DCACHE_OP_DELETE);
+#endif /* HAVE_D_SET_D_OP */
+}
+
 #endif /* _ZFS_DCACHE_H */