Add create_on_open option
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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diff --git a/HOWTO b/HOWTO
index b8a7dd7..2cfe369 100644
--- a/HOWTO
+++ b/HOWTO
@@ -693,6 +693,9 @@
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 cfcfa9a..088b77c 100644
--- a/filesetup.c
+++ b/filesetup.c
@@ -314,6 +314,8 @@
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 @@
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 11338eb..dd09cee 100644
--- a/fio.h
+++ b/fio.h
@@ -443,6 +443,7 @@
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 cec7bb7..73815bb 100644
--- a/options.c
+++ b/options.c
@@ -1290,6 +1290,13 @@
.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,
.off1 = td_var_offset(cpuload),