linux-ext4 - [PATCH] libext2fs: check for fallocate symbol before using it

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Date:	Mon,  5 Mar 2012 00:36:35 -0500
From:	Mike Frysinger <vapier@...too.org>
To:	linux-ext4@...r.kernel.org
Subject: [PATCH] libext2fs: check for fallocate symbol before using it

If we have newer kernel headers which define FALLOC_FL_PUNCH_HOLE, but we
are on an older glibc which lacks fallocate, we end up trying to use the
func anyways.  Check the ifdef that autoconf already set up for us.

Reported-by: Ortwin Glueck <odi@....ch>
Signed-off-by: Mike Frysinger <vapier@...too.org>
---
 lib/ext2fs/unix_io.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/ext2fs/unix_io.c b/lib/ext2fs/unix_io.c
index 9f0613a..da3f8fd 100644
--- a/lib/ext2fs/unix_io.c
+++ b/lib/ext2fs/unix_io.c
@@ -905,7 +905,7 @@ static errcode_t unix_discard(io_channel channel, unsigned long long block,
 		goto unimplemented;
 #endif
 	} else {
-#ifdef FALLOC_FL_PUNCH_HOLE
+#if defined(HAVE_FALLOCATE) && defined(FALLOC_FL_PUNCH_HOLE)
 		/*
 		 * If we are not on block device, try to use punch hole
 		 * to reclaim free space.
-- 
1.7.8.4

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