Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:49062 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752516AbdECQFb (ORCPT ); Wed, 3 May 2017 12:05:31 -0400 Subject: [PATCH 6/9] Sample program for driving fsopen/fsmount From: David Howells To: viro@zeniv.linux.org.uk Cc: linux-fsdevel@vger.kernel.org, dhowells@redhat.com, linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, mszeredi@redhat.com Date: Wed, 03 May 2017 17:05:24 +0100 Message-ID: <149382752396.30481.8468912363685051016.stgit@warthog.procyon.org.uk> In-Reply-To: <149382747487.30481.15428192741961545429.stgit@warthog.procyon.org.uk> References: <149382747487.30481.15428192741961545429.stgit@warthog.procyon.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-nfs-owner@vger.kernel.org List-ID: --- samples/fsmount/test-fsmount.c | 79 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 samples/fsmount/test-fsmount.c diff --git a/samples/fsmount/test-fsmount.c b/samples/fsmount/test-fsmount.c new file mode 100644 index 000000000000..715617f86000 --- /dev/null +++ b/samples/fsmount/test-fsmount.c @@ -0,0 +1,79 @@ +/* fd-based mount test. + * + * Copyright (C) 2017 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ + +#include +#include +#include +#include +#include +#include + +#define E(x) do { if ((x) == -1) { perror(#x); exit(1); } } while(0) + +static __attribute__((noreturn)) +void mount_error(int fd, const char *s) +{ + char buf[4096]; + int err, n; + + err = errno; + n = read(fd, buf, sizeof(buf)); + errno = err; + if (n > 0) { + n -= 2; + fprintf(stderr, "Error: '%s': %*.*s: %m\n", s, n, n, buf + 2); + } else { + fprintf(stderr, "%s: %m\n", s); + } + exit(1); +} + +#define E_write(fd, s) \ + do { \ + if (write(fd, s, sizeof(s) - 1) == -1) \ + mount_error(fd, s); \ + } while (0) + +static inline int fsopen(const char *fs_name, int reserved, int flags) +{ + return syscall(333, fs_name, reserved, flags); +} + +static inline int fsmount(int fsfd, int dfd, const char *path) +{ + return syscall(334, fsfd, dfd, path); +} + +int main() +{ + int mfd; + + /* Mount an NFS filesystem */ + mfd = fsopen("nfs4", -1, 0); + if (mfd == -1) { + perror("fsopen"); + exit(1); + } + + E_write(mfd, "d warthog:/data"); + E_write(mfd, "o fsc"); + E_write(mfd, "o sync"); + E_write(mfd, "o intr"); + E_write(mfd, "o vers=4.2"); + E_write(mfd, "o addr=90.155.74.18"); + E_write(mfd, "o clientaddr=90.155.74.21"); + //E_write(mfd, "r /data"); + if (fsmount(mfd, AT_FDCWD, "/mnt") < 0) + mount_error(mfd, "fsmount"); + E(close(mfd)); + + exit(0); +}