diff -ur transmission-2.30b1.orig/configure.ac transmission-2.30b1/configure.ac
--- transmission-2.30b1.orig/configure.ac	2011-04-01 03:28:41.000000000 +0200
+++ transmission-2.30b1/configure.ac	2011-04-08 14:31:31.233502737 +0200
@@ -108,6 +108,14 @@
 AC_HEADER_STDC
 AC_HEADER_TIME
 
+AC_MSG_CHECKING([for SYS_fallocate])
+AC_TRY_LINK([#include <sys/syscall.h>
+#include <sys/types.h>],
+       [return syscall(SYS_fallocate, 0, 0, (loff_t) 0, (loff_t) 0);],
+       [AC_DEFINE([HAVE_SYS_FALLOCATE],[1],[Defined if you have the SYS_fallocate syscall number])
+       AC_MSG_RESULT([yes])],
+       [AC_MSG_RESULT([no])])
+
 AC_CHECK_HEADERS([stdbool.h])
 AC_CHECK_FUNCS([iconv_open pread pwrite lrintf strlcpy daemon dirname basename strcasecmp localtime_r fallocate64 posix_fallocate memmem strsep strtold syslog valloc getpagesize posix_memalign statvfs htonll ntohll])
 AC_PROG_INSTALL
diff -ur transmission-2.30b1.orig/libtransmission/fdlimit.c transmission-2.30b1/libtransmission/fdlimit.c
--- transmission-2.30b1.orig/libtransmission/fdlimit.c	2011-04-01 03:28:34.000000000 +0200
+++ transmission-2.30b1/libtransmission/fdlimit.c	2011-04-08 14:34:14.120502738 +0200
@@ -29,6 +29,10 @@
  #include <fcntl.h>
 #endif
 
+#ifdef HAVE_SYS_FALLOCATE
+ #include <sys/syscall.h>
+#endif
+
 #ifdef HAVE_FALLOCATE64
   /* FIXME can't find the right #include voodoo to pick up the declaration.. */
   extern int fallocate64( int fd, int mode, uint64_t offset, uint64_t len );
@@ -150,6 +154,14 @@
             success = !fcntl( fd, F_PREALLOCATE, &fst );
         }
 # endif
+
+# ifdef HAVE_SYS_FALLOCATE
+       if( !success )
+       {
+           success = !syscall( SYS_fallocate, fd, 0, (loff_t) 0, (loff_t) length );
+       }
+# endif
+
 # ifdef HAVE_POSIX_FALLOCATE
         if( !success )
         {