X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=filesetup.c;h=84cd7f7dfe2bffa93ed62d3ea7aaa790cd6e02b3;hp=610981b437594d32c90587178b323c2ce6dcc348;hb=145dad6d3e1ae4bf44dd49eea9d0c025500b97d0;hpb=ed92ac0ce9ce1cc64697272d307d4fa7d18ed64c

diff --git a/filesetup.c b/filesetup.c
index 610981b4..84cd7f7d 100644
--- a/filesetup.c
+++ b/filesetup.c
@@ -15,7 +15,7 @@ static int file_ok(struct thread_data *td, struct fio_file *f)
 {
 	struct stat st;
 
-	if (td->filetype != FIO_TYPE_FILE)
+	if (td->filetype != FIO_TYPE_FILE || (td->io_ops->flags & FIO_NULLIO))
 		return 0;
 
 	if (stat(f->file_name, &st) == -1)
@@ -154,6 +154,16 @@ static int file_size(struct thread_data *td, struct fio_file *f)
 {
 	struct stat st;
 
+	/*
+	 * if we are not doing real io, just pretend the file is as large
+	 * as the size= given. this works fine with nrfiles > 1 as well,
+	 * we only really care about it being at least as big as size=
+	 */
+	if (td->io_ops->flags & FIO_NULLIO) {
+		f->real_file_size = f->file_size = td->total_file_size;
+		return 0;
+	}
+
 	if (td->overwrite) {
 		if (fstat(f->fd, &st) == -1) {
 			td_verror(td, errno);
@@ -332,29 +342,38 @@ static int setup_file(struct thread_data *td, struct fio_file *f)
 
 	if (td->io_ops->flags & FIO_NETIO)
 		return 0;
-	if (td->odirect)
-		flags |= OS_O_DIRECT;
-	if (td->sync_io)
-		flags |= O_SYNC;
 
-	if (td_write(td) || td_rw(td)) {
-		flags |= O_RDWR;
+	/*
+	 * we need a valid file descriptor, but don't create a real file.
+	 * lets just dup stdout, seems like a sensible approach.
+	 */
+	if (td->io_ops->flags & FIO_NULLIO)
+		f->fd = dup(STDOUT_FILENO);
+	else {
+		if (td->odirect)
+			flags |= OS_O_DIRECT;
+		if (td->sync_io)
+			flags |= O_SYNC;
+
+		if (td_write(td) || td_rw(td)) {
+			flags |= O_RDWR;
 
-		if (td->filetype == FIO_TYPE_FILE) {
-			if (!td->overwrite)
-				flags |= O_TRUNC;
+			if (td->filetype == FIO_TYPE_FILE) {
+				if (!td->overwrite)
+					flags |= O_TRUNC;
 
-			flags |= O_CREAT;
-		}
+				flags |= O_CREAT;
+			}
 
-		f->fd = open(f->file_name, flags, 0600);
-	} else {
-		if (td->filetype == FIO_TYPE_CHAR)
-			flags |= O_RDWR;
-		else
-			flags |= O_RDONLY;
+			f->fd = open(f->file_name, flags, 0600);
+		} else {
+			if (td->filetype == FIO_TYPE_CHAR)
+				flags |= O_RDWR;
+			else
+				flags |= O_RDONLY;
 
-		f->fd = open(f->file_name, flags);
+			f->fd = open(f->file_name, flags);
+		}
 	}
 
 	if (f->fd == -1) {