Re: [PATCH 00/17] VFS: Filesystem information and notifications [ver #17]

David Howells
2020-03-03T14:20:09Z

Greg Kroah-Hartman <gregkh@linuxfoundation.org> wrote:

> + fd = do_sys_open(dfd, filename, flags, 0000);
> + if (fd <= 0)
> + return fd;
> +
> + retval = ksys_read(fd, buffer, bufsize);
> +
> + __close_fd(current->files, fd);

If you can use dentry_open() and vfs_read(), you might be able to avoid
dealing with file descriptors entirely. That might make it worth a syscall.

You're going to be asked for writefile() you know ;-)

David