ioengine: Add fallocate ioengine
IO engine that does regular fallocate to simulate data transfer
as fio ioengine.
DDIR_READ does fallocate(,mode=FALLOC_FL_KEEP_SIZE,)
DDIR_WRITE does fallocate(,mode=0) : fallocate with file extention
DDIR_TRIM does fallocate(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)
This engine may be useful to perform various tests:
1) Generation highly fragmentated files
2) Various fs stress testing in parallel with others io activity
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/engines/falloc.c b/engines/falloc.c
new file mode 100644
index 0000000..cbb30cb
--- /dev/null
+++ b/engines/falloc.c
@@ -0,0 +1,121 @@
+/*
+ * falloc: ioengine for git://git.kernel.dk/fio.git
+ *
+ * IO engine that does regular fallocate to simulate data transfer
+ * as fio ioengine.
+ * DDIR_READ does fallocate(,mode = FALLOC_FL_KEEP_SIZE,)
+ * DDIR_WRITE does fallocate(,mode = 0) : fallocate with size extention
+ * DDIR_TRIM does fallocate(,mode = FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)
+ *
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/uio.h>
+#include <errno.h>
+#include <assert.h>
+#include <fcntl.h>
+
+#include "../fio.h"
+#include "../filehash.h"
+
+/*
+ * generic_open_file is not appropriate because does not allow to perform
+ * TRIM in to file
+ */
+int open_file(struct thread_data *td, struct fio_file *f)
+{
+ int from_hash = 0;
+
+ dprint(FD_FILE, "fd open %s\n", f->file_name);
+
+ if (f->filetype != FIO_TYPE_FILE) {
+ log_err("fio: only files are supported fallocate \n");
+ return 1;
+ }
+ if (!strcmp(f->file_name, "-")) {
+ log_err("fio: can't read/write to stdin/out\n");
+ return 1;
+ }
+
+open_again:
+ from_hash = file_lookup_open(f, O_CREAT|O_RDWR);
+
+ if (f->fd == -1) {
+ char buf[FIO_VERROR_SIZE];
+ int __e = errno;
+ snprintf(buf, sizeof(buf) - 1, "open(%s)", f->file_name);
+ td_verror(td, __e, buf);
+ }
+
+ if (!from_hash && f->fd != -1) {
+ if (add_file_hash(f)) {
+ int fio_unused ret;
+
+ /*
+ * OK to ignore, we haven't done anything with it
+ */
+ ret = generic_close_file(td, f);
+ goto open_again;
+ }
+ }
+
+ return 0;
+}
+
+#ifndef FALLOC_FL_KEEP_SIZE
+#define FALLOC_FL_KEEP_SIZE 0x01 /* default is extend size */
+#endif
+#ifndef FALLOC_FL_PUNCH_HOLE
+#define FALLOC_FL_PUNCH_HOLE 0x02 /* de-allocates range */
+#endif
+static int fio_fallocate_queue(struct thread_data *td, struct io_u *io_u)
+{
+ struct fio_file *f = io_u->file;
+ int ret;
+ int flags = 0;
+
+ fio_ro_check(td, io_u);
+
+ if (io_u->ddir == DDIR_READ)
+ flags = FALLOC_FL_KEEP_SIZE;
+ else if (io_u->ddir == DDIR_WRITE)
+ flags = 0;
+ else if (io_u->ddir == DDIR_TRIM)
+ flags = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
+
+ ret = fallocate(f->fd, flags, io_u->offset, io_u->xfer_buflen);
+
+ if (ret) {
+ io_u->error = errno;
+ if (io_u->error)
+ td_verror(td, io_u->error, "xfer");
+ }
+ if (io_u->ddir == DDIR_TRIM && !ret)
+ return io_u->xfer_buflen;
+
+ if (io_u->file && ret == 0 && ddir_rw(io_u->ddir))
+ io_u->file->file_pos = io_u->offset + ret;
+
+ return FIO_Q_COMPLETED;
+}
+
+static struct ioengine_ops ioengine = {
+ .name = "falloc",
+ .version = FIO_IOOPS_VERSION,
+ .queue = fio_fallocate_queue,
+ .open_file = open_file,
+ .close_file = generic_close_file,
+ .get_file_size = generic_get_file_size,
+ .flags = FIO_SYNCIO
+};
+
+static void fio_init fio_syncio_register(void)
+{
+ register_ioengine(&ioengine);
+}
+
+static void fio_exit fio_syncio_unregister(void)
+{
+ unregister_ioengine(&ioengine);
+}