From 948f9b2eed7aeee6367957ea30be7a2da94d5b1b Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 20 Feb 2007 19:49:57 +0100 Subject: [PATCH] mmap IO engine cannot extend a file We need to ftruncate it to the wanted size first, or the mmap write will terminate with SIGBUS. Signed-off-by: Jens Axboe --- engines/mmap.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/engines/mmap.c b/engines/mmap.c index d32fe969..08bbd991 100644 --- a/engines/mmap.c +++ b/engines/mmap.c @@ -42,10 +42,33 @@ static int fio_mmapio_queue(struct thread_data *td, struct io_u *io_u) return FIO_Q_COMPLETED; } +static int fio_mmapio_init(struct thread_data *td) +{ + struct fio_file *f; + int i; + + if (td->ddir == DDIR_READ && !td_rw(td)) + return 0; + + /* + * We need to truncate the files to the right size, if + * we are writing to it. + */ + for_each_file(td, f, i) { + if (ftruncate(f->fd, f->file_size) < 0) { + td_verror(td, errno); + return 1; + } + } + + return 0; +} + static struct ioengine_ops ioengine = { .name = "mmap", .version = FIO_IOOPS_VERSION, .queue = fio_mmapio_queue, + .init = fio_mmapio_init, .flags = FIO_SYNCIO | FIO_MMAPIO, }; -- 2.25.1