diff --git a/acconfig.h b/acconfig.h
index 548d496aff..95ed141944 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -31,6 +31,7 @@ static /**/const char *const rcsid[] = { (char *)rcsid, "\100(#)" msg }
 #undef INODE_SETATTR_NOT_VOID
 #undef STRUCT_INODE_HAS_I_BYTES
 #undef STRUCT_INODE_HAS_I_CDEV
+#undef STRUCT_INODE_HAS_I_TRUNCATE_SEM
 #undef STRUCT_ADDRESS_SPACE_HAS_PAGE_LOCK
 
 /* glue for RedHat kernel bug */
diff --git a/configure.in b/configure.in
index e0ae300113..3313675450 100644
--- a/configure.in
+++ b/configure.in
@@ -112,6 +112,7 @@ case $system in
 	         LINUX_FS_STRUCT_INODE_HAS_I_BYTES
 	         LINUX_FS_STRUCT_ADDRESS_SPACE_HAS_PAGE_LOCK
 		 LINUX_FS_STRUCT_INODE_HAS_I_CDEV
+		 LINUX_FS_STRUCT_INODE_HAS_I_TRUNCATE_SEM
 	  	 LINUX_INODE_SETATTR_RETURN_TYPE
 		 LINUX_NEED_RHCONFIG
 		 LINUX_WHICH_MODULES
@@ -121,6 +122,9 @@ case $system in
 		 if test "x$ac_cv_linux_fs_struct_inode_has_i_cdev" = "xyes"; then 
 		  AC_DEFINE(STRUCT_INODE_HAS_I_CDEV)
 		 fi
+		 if test "x$ac_cv_linux_fs_struct_inode_has_i_truncate_sem" = "xyes"; then 
+		  AC_DEFINE(STRUCT_INODE_HAS_I_TRUNCATE_SEM)
+		 fi
 		 if test "x$ac_cv_linux_fs_struct_inode_has_i_bytes" = "xyes"; then 
 		  AC_DEFINE(STRUCT_INODE_HAS_I_BYTES)
 		 fi
diff --git a/src/afs/LINUX/osi_vfs.h b/src/afs/LINUX/osi_vfs.h
index 30d14fce3d..e390f6a807 100644
--- a/src/afs/LINUX/osi_vfs.h
+++ b/src/afs/LINUX/osi_vfs.h
@@ -54,6 +54,9 @@ typedef struct vnode {
         unsigned short          i_bytes;
 #endif
 	struct semaphore	i_sem;
+#ifdef STRUCT_INODE_HAS_I_TRUNCATE_SEM
+        struct rw_semaphore     i_truncate_sem;
+#endif
 #if defined(AFS_LINUX24_ENV)
         struct semaphore        i_zombie;
 #else
diff --git a/src/cf/linux-test4.m4 b/src/cf/linux-test4.m4
index 1755b3187a..de9c468040 100644
--- a/src/cf/linux-test4.m4
+++ b/src/cf/linux-test4.m4
@@ -12,3 +12,18 @@ ac_cv_linux_fs_struct_inode_has_i_cdev=yes,
 ac_cv_linux_fs_struct_inode_has_i_cdev=no)])
 AC_MSG_RESULT($ac_cv_linux_fs_struct_inode_has_i_cdev)
 CPPFLAGS="$save_CPPFLAGS"])
+
+AC_DEFUN(LINUX_FS_STRUCT_INODE_HAS_I_TRUNCATE_SEM, [
+AC_MSG_CHECKING(for i_truncate_sem in struct inode)
+save_CPPFLAGS="$CPPFLAGS"
+CPPFLAGS="-I${LINUX_KERNEL_PATH}/include -D__KERNEL__ $CPPFLAGS"
+AC_CACHE_VAL(ac_cv_linux_fs_struct_inode_has_i_truncate_sem, 
+[
+AC_TRY_COMPILE(
+[#include <linux/fs.h>],
+[struct inode _inode;
+printf("%d\n", _inode.i_truncate_sem);], 
+ac_cv_linux_fs_struct_inode_has_i_truncate_sem=yes,
+ac_cv_linux_fs_struct_inode_has_i_truncate_sem=no)])
+AC_MSG_RESULT($ac_cv_linux_fs_struct_inode_has_i_truncate_sem)
+CPPFLAGS="$save_CPPFLAGS"])