From c0ebca237c6748365b2400529e02b5c8342e6ecc Mon Sep 17 00:00:00 2001
From: Björn Jacke <bj@sernet.de>
Date: Thu, 18 Feb 2010 10:01:26 +0100
Subject: s3: optimize strict allocate for XFS on IRIX

---
 source3/lib/system.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/source3/lib/system.c b/source3/lib/system.c
index 9c1da3a78b..58240a34a8 100644
--- a/source3/lib/system.c
+++ b/source3/lib/system.c
@@ -627,6 +627,31 @@ int sys_posix_fallocate(int fd, SMB_OFF_T offset, SMB_OFF_T len)
 	return posix_fallocate64(fd, offset, len);
 #elif defined(HAVE_POSIX_FALLOCATE) && !defined(HAVE_BROKEN_POSIX_FALLOCATE)
 	return posix_fallocate(fd, offset, len);
+#elif defined(F_RESVSP64)
+	/* this handles XFS on IRIX */
+	struct flock64 fl;
+	SMB_OFF_T new_len = offset + len;
+	int ret;
+	struct stat64 sbuf;
+
+	/* unlikely to get a too large file on a 64bit system but ... */
+	if (new_len < 0)
+		return EFBIG;
+
+	fl.l_whence = SEEK_SET;
+	fl.l_start = offset;
+	fl.l_len = len;
+
+	ret=fcntl(fd, F_RESVSP64, &fl);
+
+	if (ret != 0)
+		return errno;
+
+	/* Make sure the file gets enlarged after we allocated space: */
+	fstat64(fd, &sbuf);
+	if (new_len > sbuf.st_size)
+		ftruncate64(fd, new_len);
+	return 0;
 #else
 	return ENOSYS;
 #endif
-- 
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