#include <errno.h>
#include <assert.h>
#include <sys/poll.h>
+#include <sys/mman.h>
#include "../fio.h"
-#ifdef FIO_HAVE_SPLICE
-
struct spliceio_data {
int pipe[2];
int vmsplice_to_user;
+ int vmsplice_to_user_map;
};
/*
*/
static int fio_splice_read_old(struct thread_data *td, struct io_u *io_u)
{
- struct spliceio_data *sd = td->io_ops->data;
+ struct spliceio_data *sd = td->io_ops_data;
struct fio_file *f = io_u->file;
int ret, ret2, buflen;
off_t offset;
- void *p;
+ char *p;
offset = io_u->offset;
buflen = io_u->xfer_buflen;
*/
static int fio_splice_read(struct thread_data *td, struct io_u *io_u)
{
- struct spliceio_data *sd = td->io_ops->data;
+ struct spliceio_data *sd = td->io_ops_data;
struct fio_file *f = io_u->file;
struct iovec iov;
- int ret, buflen;
+ int ret , buflen, mmap_len;
off_t offset;
- void *p;
+ void *map;
+ char *p;
+ ret = 0;
offset = io_u->offset;
- buflen = io_u->xfer_buflen;
- p = io_u->xfer_buf;
+ mmap_len = buflen = io_u->xfer_buflen;
+
+ if (sd->vmsplice_to_user_map) {
+ map = mmap(io_u->xfer_buf, buflen, PROT_READ, MAP_PRIVATE|OS_MAP_ANON, 0, 0);
+ if (map == MAP_FAILED) {
+ td_verror(td, errno, "mmap io_u");
+ return -1;
+ }
+
+ p = map;
+ } else {
+ map = NULL;
+ p = io_u->xfer_buf;
+ }
+
while (buflen) {
int this_len = buflen;
+ int flags = 0;
- if (this_len > SPLICE_DEF_SIZE)
+ if (this_len > SPLICE_DEF_SIZE) {
this_len = SPLICE_DEF_SIZE;
+ flags = SPLICE_F_MORE;
+ }
- ret = splice(f->fd, &offset, sd->pipe[1], NULL, this_len, SPLICE_F_MORE);
+ ret = splice(f->fd, &offset, sd->pipe[1], NULL, this_len,flags);
if (ret < 0) {
if (errno == ENODATA || errno == EAGAIN)
continue;
- return -errno;
+ td_verror(td, errno, "splice-from-fd");
+ break;
}
buflen -= ret;
iov.iov_base = p;
iov.iov_len = ret;
- p += ret;
while (iov.iov_len) {
ret = vmsplice(sd->pipe[0], &iov, 1, SPLICE_F_MOVE);
- if (ret < 0)
- return -errno;
- else if (!ret)
- return -ENODATA;
+ if (ret < 0) {
+ if (errno == EFAULT &&
+ sd->vmsplice_to_user_map) {
+ sd->vmsplice_to_user_map = 0;
+ munmap(map, mmap_len);
+ map = NULL;
+ p = io_u->xfer_buf;
+ iov.iov_base = p;
+ continue;
+ }
+ if (errno == EBADF) {
+ ret = -EBADF;
+ break;
+ }
+ td_verror(td, errno, "vmsplice");
+ break;
+ } else if (!ret) {
+ td_verror(td, ENODATA, "vmsplice");
+ ret = -1;
+ break;
+ }
iov.iov_len -= ret;
iov.iov_base += ret;
+ p += ret;
}
+ if (ret < 0)
+ break;
+ }
+
+ if (sd->vmsplice_to_user_map && munmap(map, mmap_len) < 0) {
+ td_verror(td, errno, "munnap io_u");
+ return -1;
}
+ if (ret < 0)
+ return ret;
return io_u->xfer_buflen;
}
-
/*
* For splice writing, we can vmsplice our data buffer directly into a
* pipe and then splice that to a file.
*/
static int fio_splice_write(struct thread_data *td, struct io_u *io_u)
{
- struct spliceio_data *sd = td->io_ops->data;
+ struct spliceio_data *sd = td->io_ops_data;
struct iovec iov = {
.iov_base = io_u->xfer_buf,
.iov_len = io_u->xfer_buflen,
static int fio_spliceio_queue(struct thread_data *td, struct io_u *io_u)
{
- struct spliceio_data *sd = td->io_ops->data;
- int ret;
+ struct spliceio_data *sd = td->io_ops_data;
+ int ret = 0;
+
+ fio_ro_check(td, io_u);
if (io_u->ddir == DDIR_READ) {
- if (sd->vmsplice_to_user)
+ if (sd->vmsplice_to_user) {
ret = fio_splice_read(td, io_u);
- else
+ /*
+ * This kernel doesn't support vmsplice to user
+ * space. Reset the vmsplice_to_user flag, so that
+ * we retry below and don't hit this path again.
+ */
+ if (ret == -EBADF)
+ sd->vmsplice_to_user = 0;
+ }
+ if (!sd->vmsplice_to_user)
ret = fio_splice_read_old(td, io_u);
} else if (io_u->ddir == DDIR_WRITE)
ret = fio_splice_write(td, io_u);
+ else if (io_u->ddir == DDIR_TRIM)
+ ret = do_io_u_trim(td, io_u);
else
- ret = fsync(io_u->file->fd);
+ ret = do_io_u_sync(td, io_u);
if (ret != (int) io_u->xfer_buflen) {
if (ret >= 0) {
io_u->error = errno;
}
- if (io_u->error)
+ if (io_u->error) {
td_verror(td, io_u->error, "xfer");
+ if (io_u->error == EINVAL)
+ log_err("fio: looks like splice doesn't work on this"
+ " file system\n");
+ }
return FIO_Q_COMPLETED;
}
static void fio_spliceio_cleanup(struct thread_data *td)
{
- struct spliceio_data *sd = td->io_ops->data;
+ struct spliceio_data *sd = td->io_ops_data;
if (sd) {
close(sd->pipe[0]);
close(sd->pipe[1]);
free(sd);
- td->io_ops->data = NULL;
}
}
}
/*
- * need some check for enabling this, for now just leave it disabled
+ * Assume this work, we'll reset this if it doesn't
*/
- sd->vmsplice_to_user = 0;
+ sd->vmsplice_to_user = 1;
- td->io_ops->data = sd;
+ /*
+ * Works with "real" vmsplice to user, eg mapping pages directly.
+ * Reset if we fail.
+ */
+ sd->vmsplice_to_user_map = 1;
+
+ /*
+ * And if vmsplice_to_user works, we definitely need aligned
+ * buffers. Just set ->odirect to force that.
+ */
+ if (td_read(td))
+ td->o.mem_align = 1;
+
+ td->io_ops_data = sd;
return 0;
}
.cleanup = fio_spliceio_cleanup,
.open_file = generic_open_file,
.close_file = generic_close_file,
- .flags = FIO_SYNCIO,
+ .get_file_size = generic_get_file_size,
+ .flags = FIO_SYNCIO | FIO_PIPEIO,
};
-#else /* FIO_HAVE_SPLICE */
-
-/*
- * When we have a proper configure system in place, we simply wont build
- * and install this io engine. For now install a crippled version that
- * just complains and fails to load.
- */
-static int fio_spliceio_init(struct thread_data fio_unused *td)
-{
- fprintf(stderr, "fio: splice not available\n");
- return 1;
-}
-
-static struct ioengine_ops ioengine = {
- .name = "splice",
- .version = FIO_IOOPS_VERSION,
- .init = fio_spliceio_init,
-};
-
-#endif
-
static void fio_init fio_spliceio_register(void)
{
register_ioengine(&ioengine);
projects / fio.git / blobdiff