Index: thunar-vfs/thunar-vfs-io-local-xfer.c
===================================================================
--- thunar-vfs/thunar-vfs-io-local-xfer.c	(revision 28910)
+++ thunar-vfs/thunar-vfs-io-local-xfer.c	(working copy)
@@ -252,6 +252,25 @@
   else
 #endif /* !HAVE_MMAP */
     {
+      /* we try to set the file offset of the target to the file size of
+       * the source. if this fails write is not going to work for us. */
+      if (lseek (target_fd, source_statb->st_size, SEEK_SET) < 0)
+        {
+          /* assume EINVAL means offset beyond the end of a seekable device,
+           * ie. file is too big for the filesystem */
+          if (G_LIKELY (errno == EINVAL))
+            errno = EFBIG;
+
+end4:
+          tvilx_set_error_with_path (error, _("Failed to write data to \"%s\""), target_absolute_path);
+          goto end3;
+        }
+      else if (lseek (target_fd, 0, SEEK_SET) < 0)
+        {
+          /* this will probably never happen, but if so, return a nice error */
+          goto end4;
+        }
+
 #ifdef HAVE_POSIX_FADVISE
       /* tell the system that the data will be read sequentially */
       posix_fadvise (source_fd, 0, 0, POSIX_FADV_SEQUENTIAL);
@@ -330,6 +349,7 @@
   futimes (target_fd, times);
 #endif
 
+end3:
   /* close the file descriptors */
   close (target_fd);
 end1: