--- /dev/null
+From 265d97d02e8ef373653c76a339869985eb3ba27a Mon Sep 17 00:00:00 2001
+From: Gustavo Zacarias <gustavo@zacarias.com.ar>
+Date: Tue, 10 Mar 2015 15:10:35 -0300
+Subject: [PATCH] configure: add check for fallocate
+
+We need to check for fallocate() rather than just linux/falloc.h +
+FALLOC_FL_PUNCH_HOLE since in uClibc we've got both but still not
+fallocate() itself since it's only implemented in newer unreleased
+versions.
+
+Status: sent upstream.
+
+Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
+---
+ configure.ac | 1 +
+ mkfs/f2fs_format_utils.c | 2 +-
+ 2 files changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/configure.ac b/configure.ac
+index ae451b8..900b84a 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -68,6 +68,7 @@ AC_TYPE_SIZE_T
+ # Checks for library functions.
+ AC_FUNC_GETMNTENT
+ AC_CHECK_FUNCS_ONCE([
++ fallocate
+ getmntent
+ memset
+ ])
+diff --git a/mkfs/f2fs_format_utils.c b/mkfs/f2fs_format_utils.c
+index a0f85f5..ddeafeb 100644
+--- a/mkfs/f2fs_format_utils.c
++++ b/mkfs/f2fs_format_utils.c
+@@ -46,7 +46,7 @@ int f2fs_trim_device()
+ #if defined(WITH_BLKDISCARD) && defined(BLKDISCARD)
+ MSG(0, "Info: Discarding device\n");
+ if (S_ISREG(stat_buf.st_mode)) {
+-#ifdef FALLOC_FL_PUNCH_HOLE
++#if defined(HAVE_FALLOCATE) && defined(FALLOC_FL_PUNCH_HOLE)
+ if (fallocate(config.fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
+ range[0], range[1]) < 0) {
+ MSG(0, "Info: fallocate(PUNCH_HOLE|KEEP_SIZE) is failed\n");
+--
+2.0.5
+