linux-kernel - [PATCH 1/3] Add fadvise interface wrapper

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Message-Id: <1290523792-6170-2-git-send-email-bgamari.foss@gmail.com>
Date:	Tue, 23 Nov 2010 09:49:50 -0500
From:	Ben Gamari <bgamari.foss@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>, rsync@...ts.samba.org
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Nick Piggin <npiggin@...nel.dk>,
	Ben Gamari <bgamari.foss@...il.com>
Subject: [PATCH 1/3] Add fadvise interface wrapper

With recent discussion on the LKML[1], it seems likely that Linux will
finally support posix_fadvise in a useful way with the FADV_DONTNEED
flag. This should allow us to minimize the effect of rsync on the
system's working set. Add the necessary wrapper to syscall.c.

[1] http://lkml.org/lkml/2010/11/21/59
---
 syscall.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/syscall.c b/syscall.c
index cfabc3e..9f5b1c3 100644
--- a/syscall.c
+++ b/syscall.c
@@ -28,6 +28,7 @@
 #ifdef HAVE_SYS_ATTR_H
 #include <sys/attr.h>
 #endif
+#include <fcntl.h>
 
 extern int dry_run;
 extern int am_root;
@@ -282,3 +283,13 @@ OFF_T do_lseek(int fd, OFF_T offset, int whence)
 	return lseek(fd, offset, whence);
 #endif
 }
+
+#if _XOPEN_SOURCE >= 600
+int do_fadvise(int fd, OFF_T offset, OFF_T len, int advise)
+{
+        return posix_fadvise(fd, offset, len, advise);
+}
+#else
+#define do_fadvise() 
+#endif
+
-- 
1.7.1

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