struct spliceio_data {
int pipe[2];
int vmsplice_to_user;
+ int vmsplice_to_user_map;
};
/*
struct spliceio_data *sd = td->io_ops->data;
struct fio_file *f = io_u->file;
struct iovec iov;
- int ret = 0 , buflen, mmap_len;
+ int ret , buflen, mmap_len;
off_t offset;
void *p, *map;
+restart:
+ ret = 0;
offset = io_u->offset;
mmap_len = buflen = io_u->xfer_buflen;
- 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;
+ 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;
}
- p = map;
while (buflen) {
int this_len = buflen;
int flags = 0;
while (iov.iov_len) {
ret = vmsplice(sd->pipe[0], &iov, 1, SPLICE_F_MOVE);
if (ret < 0) {
+ if (errno == EFAULT && sd->vmsplice_to_user_map) {
+ sd->vmsplice_to_user_map = 0;
+ munmap(map, mmap_len);
+ goto restart;
+ }
+ if (errno == EBADF) {
+ ret = -EBADF;
+ break;
+ }
td_verror(td, errno, "vmsplice");
break;
} else if (!ret) {
break;
}
- if (munmap(map, mmap_len) < 0) {
+ if (sd->vmsplice_to_user_map && munmap(map, mmap_len) < 0) {
td_verror(td, errno, "munnap io_u");
return -1;
}
*/
sd->vmsplice_to_user = 1;
+ /*
+ * 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.