[svn-r16601] Description:

	Bring r16536:16600 from trunk back into revise_chunks branch

Tested on:
        FreeBSD/32 6.3 (duty) in debug mode
        FreeBSD/64 6.3 (liberty) w/C++ & FORTRAN, in debug mode
        Linux/32 2.6 (jam) w/PGI compilers, w/C++ & FORTRAN, w/threadsafe,
                                in debug mode
        Linux/64-amd64 2.6 (smirom) w/Intel compilers w/default API=1.6.x,
                                w/C++ & FORTRAN, in production mode
        Solaris/32 2.10 (linew) w/deprecated symbols disabled, w/C++ & FORTRAN,
                                w/szip filter, in production mode
        Linux/64-ia64 2.6 (cobalt) w/Intel compilers, w/C++ & FORTRAN,
                                in production mode
        Linux/64-ia64 2.4 (tg-login3) w/parallel, w/FORTRAN, in production mode
        Linux/64-amd64 2.6 (abe) w/parallel, w/FORTRAN, in production mode
        Mac OS X/32 10.5.6 (amazon) in debug mode
        Mac OS X/32 10.5.6 (amazon) w/C++ & FORTRAN, w/threadsafe,
                                in production mode

1 files changed, 44 insertions, 0 deletions

diff --git a/src/H5B.c b/src/H5B.c
index d5ac87a..254183f 100644
--- a/src/H5B.c
+++ b/src/H5B.c
@@ -2057,3 +2057,47 @@ done:
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5B_get_info() */
 
+#ifndef H5_STRICT_FORMAT_CHECKS
+
+/*-------------------------------------------------------------------------
+ * Function:    H5B_valid
+ *
+ * Purpose:     Attempt to load a b-tree node.
+ *
+ * Return:      Non-negative on success/Negative on failure
+ *
+ * Programmer:  Neil Fortner
+ *              March 17, 2009
+ *
+ *-------------------------------------------------------------------------
+ */
+htri_t
+H5B_valid(H5F_t *f, hid_t dxpl_id, const H5B_class_t *type, haddr_t addr)
+{
+    H5B_t               *bt;                        /* The btree */
+    htri_t		ret_value = SUCCEED;        /* Return value */
+
+    FUNC_ENTER_NOAPI(H5B_valid, FAIL)
+
+    /*
+     * Check arguments.
+     */
+    HDassert(f);
+    HDassert(type);
+
+    if(!H5F_addr_defined(addr))
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "address is undefined")
+
+    /* Protect the node */
+    if(NULL == (bt = (H5B_t *)H5AC_protect(f, dxpl_id, H5AC_BT, addr, type, NULL, H5AC_READ)))
+	HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree node")
+
+    /* Release the node */
+    if(H5AC_unprotect(f, dxpl_id, H5AC_BT, addr, bt, H5AC__NO_FLAGS_SET) < 0)
+        HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree node")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5B_valid() */
+#endif /* H5_STRICT_FORMAT_CHECKS */
+