From: Jens Axboe <jens.axboe@oracle.com>
Date: Wed, 4 Mar 2009 11:53:13 +0000 (+0100)
Subject: Add create_on_open option
X-Git-Tag: fio-1.25~20
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=814452bd47e0f2bb4825b8042b664f32de0aff8d

Add create_on_open option

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

 Please enter the commit message for your changes. Lines starting
---

diff --git a/HOWTO b/HOWTO
index b8a7dd74..2cfe3695 100644
--- a/HOWTO
+++ b/HOWTO
@@ -693,6 +693,9 @@ create_serialize=bool	If true, serialize the file creating for the jobs.
 create_fsync=bool	fsync the data file after creation. This is the
 			default.
 
+create_on_open=bool	Don't pre-setup the files for IO, just create open()
+			when it's time to do IO to that file.
+
 unlink=bool	Unlink the job files when done. Not the default, as repeated
 		runs of that job would then waste time recreating the file
 		set again and again.
diff --git a/filesetup.c b/filesetup.c
index cfcfa9ae..088b77c3 100644
--- a/filesetup.c
+++ b/filesetup.c
@@ -314,6 +314,8 @@ int generic_open_file(struct thread_data *td, struct fio_file *f)
 		flags |= O_SYNC;
 	if (f->filetype != FIO_TYPE_FILE)
 		flags |= FIO_O_NOATIME;
+	if (td->o.create_on_open)
+		flags |= O_CREAT;
 
 open_again:
 	if (td_write(td)) {
@@ -534,8 +536,11 @@ int setup_files(struct thread_data *td)
 		if (f->filetype == FIO_TYPE_FILE &&
 		    (f->io_size + f->file_offset) > f->real_file_size &&
 		    !(td->io_ops->flags & FIO_DISKLESSIO)) {
-			need_extend++;
-			extend_size += (f->io_size + f->file_offset);
+			if (!td->o.create_on_open) {
+				need_extend++;
+				extend_size += (f->io_size + f->file_offset);
+			} else
+				f->real_file_size = f->io_size + f->file_offset;
 			f->flags |= FIO_FILE_EXTEND;
 		}
 	}
diff --git a/fio.h b/fio.h
index 11338eb7..dd09ceec 100644
--- a/fio.h
+++ b/fio.h
@@ -443,6 +443,7 @@ struct thread_options {
 	unsigned int invalidate_cache;
 	unsigned int create_serialize;
 	unsigned int create_fsync;
+	unsigned int create_on_open;
 	unsigned int end_fsync;
 	unsigned int sync_io;
 	unsigned int verify;
diff --git a/options.c b/options.c
index cec7bb79..73815bb0 100644
--- a/options.c
+++ b/options.c
@@ -1289,6 +1289,13 @@ static struct fio_option options[] = {
 		.help	= "Fsync file after creation",
 		.def	= "1",
 	},
+	{
+		.name	= "create_on_open",
+		.type	= FIO_OPT_BOOL,
+		.off1	= td_var_offset(create_on_open),
+		.help	= "Create files when they are opened for IO",
+		.def	= "0",
+	},
 	{
 		.name	= "cpuload",
 		.type	= FIO_OPT_INT,