From: Gurudas Pai <gurudas.pai@oracle.com>
Date: Thu, 24 Jan 2008 12:04:44 +0000 (+0100)
Subject: file extent fix
X-Git-Tag: fio-1.17.3~4
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=587af925762ff4bdf6a54965a35b2da2637f2f6e

file extent fix

I ran a test with latest fio using jobfile,

[global]
size=10m
[job1]
ioengine=sync
rw=write
filename=testfile

And second time,
[global]
size=30m --> size increased.
[job1]
ioengine=sync
rw=write
filename=testfile

fio did not extend the file to 30m.

In case of f->file_offset=0, f->io_size equals to f->real_file_size, hence no extend.
Following patch worked for me. But this patch will not handle the case where we have
to extend a file and with offset :(

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

diff --git a/filesetup.c b/filesetup.c
index 34130b89..c407d0ef 100644
--- a/filesetup.c
+++ b/filesetup.c
@@ -407,7 +407,8 @@ int setup_files(struct thread_data *td)
 			     f->real_file_size) {
 				if (f->file_offset > f->real_file_size)
 					goto err_offset;
-				f->io_size = f->real_file_size - f->file_offset;
+				if (f->file_offset)
+					f->io_size = f->real_file_size - f->file_offset;
 			}
 		} else if (f->real_file_size < td->o.file_size_low ||
 			   f->real_file_size > td->o.file_size_high) {