From 26160366d7ba5c7baf20ae091d5dd0388714df83 Mon Sep 17 00:00:00 2001
From: Akira TAGOH <akira@tagoh.org>
Date: Mon, 28 May 2012 15:58:56 +0900
Subject: [PATCH] fcatomic: fallback to create a directory with FcAtomicLock

link(2) might be failed on the filesystem that doesn't support
the hard link. e.g. FcAtomicLock() always fails on FAT filesystem
when link(2) is available.
So that may be a good idea to fallback if link(2) is failed.
---
 src/fcatomic.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/fcatomic.c b/src/fcatomic.c
index 33c1cc6..4f6ab01 100644
--- a/src/fcatomic.c
+++ b/src/fcatomic.c
@@ -130,6 +130,13 @@ FcAtomicLock (FcAtomic *atomic)
 	return FcFalse;
     }
     ret = link ((char *) atomic->tmp, (char *) atomic->lck);
+    if (ret < 0 && errno == EPERM)
+    {
+	/* the filesystem where atomic->lck points to may not supports
+	 * the hard link. so better try to fallback
+	 */
+	ret = mkdir ((char *) atomic->lck, 0600);
+    }
     (void) unlink ((char *) atomic->tmp);
 #else
     ret = mkdir ((char *) atomic->lck, 0600);
@@ -195,7 +202,8 @@ void
 FcAtomicUnlock (FcAtomic *atomic)
 {
 #ifdef HAVE_LINK
-    unlink ((char *) atomic->lck);
+    if (unlink ((char *) atomic->lck) == -1)
+	rmdir ((char *) atomic->lck);
 #else
     rmdir ((char *) atomic->lck);
 #endif