From: Jens Axboe <axboe@fb.com>
Date: Mon, 9 May 2016 14:42:40 +0000 (-0600)
Subject: filesetup: ensure that we align file starting offset
X-Git-Tag: fio-2.10~36
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=c465cd14ca958dfdb87bb1998add722d62ae3691

filesetup: ensure that we align file starting offset

If --offset=xx is given, and xx isn't a multiple of the block size,
then align it if we're doing O_DIRECT IO.

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

diff --git a/filesetup.c b/filesetup.c
index 3fc14641..9c37ae57 100644
--- a/filesetup.c
+++ b/filesetup.c
@@ -761,12 +761,16 @@ static unsigned long long get_fs_free_counts(struct thread_data *td)
 uint64_t get_start_offset(struct thread_data *td, struct fio_file *f)
 {
 	struct thread_options *o = &td->o;
+	uint64_t offset;
 
 	if (o->file_append && f->filetype == FIO_TYPE_FILE)
 		return f->real_file_size;
 
-	return td->o.start_offset +
-		td->subjob_number * td->o.offset_increment;
+	offset = td->o.start_offset + td->subjob_number * td->o.offset_increment;
+	if (offset % td_max_bs(td))
+		offset -= (offset % td_max_bs(td));
+
+	return offset;
 }
 
 /*