From a0eb4997e3fe992f8600fde7c59be033afd36adf Mon Sep 17 00:00:00 2001
From: Eric Wong <normalperson@yhbt.net>
Date: Sat, 14 Sep 2013 09:18:15 +0000
Subject: [PATCH] pcu-fadvise: fall back if O_NOATIME fails due to EPERM

open() may fail with EPERM on files we do not own.
---
 fadvise.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fadvise.c b/fadvise.c
index 12c9b1b..b4b85d7 100644
--- a/fadvise.c
+++ b/fadvise.c
@@ -31,9 +31,15 @@ static void apply_fadvise(const char *path, off_t offset, off_t len, int advice)
 	int fd;
 
 	if ((fd = open(path, O_RDONLY|O_NOATIME)) < 0) {
+		if (errno == EPERM && O_NOATIME != 0) {
+			fd = open(path, O_RDONLY);
+			if (fd >= 0)
+				goto ok;
+		}
 		fprintf(stderr, "%s: open(): %s\n", path, strerror(errno));
 		return;
 	}
+ok:
 
 	if (len <= 0) {
 		/* for compatibility with kernels < 2.6.6 */
-- 
2.11.4.GIT