Add a default flag (SENDFILE_DEFAULT) and a flag for requesting zerocopy notifications (SENDFILE_ZC). do_sendfile is updated to pass through the corresponding splice flag to enable zerocopy notifications.
Signed-off-by: Joe Damato jdamato@fastly.com --- fs/read_write.c | 5 +++++ include/linux/sendfile.h | 10 ++++++++++ 2 files changed, 15 insertions(+) create mode 100644 include/linux/sendfile.h
diff --git a/fs/read_write.c b/fs/read_write.c index 057e5f37645d..e3929fd0f605 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -16,6 +16,7 @@ #include <linux/export.h> #include <linux/syscalls.h> #include <linux/pagemap.h> +#include <linux/sendfile.h> #include <linux/splice.h> #include <linux/compat.h> #include <linux/mount.h> @@ -1360,6 +1361,10 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, retval = rw_verify_area(WRITE, fd_file(out), &out_pos, count); if (retval < 0) return retval; + + if (flags & SENDFILE_ZC) + fl |= SPLICE_F_ZC; + retval = do_splice_direct(fd_file(in), &pos, fd_file(out), &out_pos, count, fl); } else { diff --git a/include/linux/sendfile.h b/include/linux/sendfile.h new file mode 100644 index 000000000000..0bd3c76ea6f2 --- /dev/null +++ b/include/linux/sendfile.h @@ -0,0 +1,10 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef SENDFILE_H +#define SENDFILE_H + +#define SENDFILE_DEFAULT (0x1) /* normal sendfile */ +#define SENDFILE_ZC (0x2) /* sendfile which generates ZC notifications */ + +#define SENDFILE_ALL (SENDFILE_DEFAULT|SENDFILE_ZC) + +#endif