From: Jens Axboe <jens.axboe@oracle.com>
Date: Wed, 25 Oct 2006 09:21:05 +0000 (+0200)
Subject: [PATCH] Use posix_fallocate() to force file layout
X-Git-Tag: fio-1.8~39
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=40f8298cd252157fa15d93f8eb470116a94069a0

[PATCH] Use posix_fallocate() to force file layout

Dunno how well this works on all filesystems, but at least it's
a good hint to send wrt fragmentation and layout.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

diff --git a/filesetup.c b/filesetup.c
index 52d822ac..0b956404 100644
--- a/filesetup.c
+++ b/filesetup.c
@@ -44,6 +44,11 @@ static int create_file(struct thread_data *td, struct fio_file *f)
 		goto err;
 	}
 
+	if (posix_fallocate(f->fd, 0, f->file_size) < 0) {
+		td_verror(td, errno);
+		goto err;
+	}
+
 	b = malloc(td->max_bs);
 	memset(b, 0, td->max_bs);