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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 13/23] VFS: Add a sample program for fsopen/fsmount [ver #4] From: David Howells To: mszeredi@redhat.com, viro@zeniv.linux.org.uk, jlayton@redhat.com Cc: dhowells@redhat.com, linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 22 May 2017 16:53:31 +0100 Message-ID: <149546841172.9289.17259162496296647409.stgit@warthog.procyon.org.uk> In-Reply-To: <149546825563.9289.9065118651584207610.stgit@warthog.procyon.org.uk> References: <149546825563.9289.9065118651584207610.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Mon, 22 May 2017 15:53:34 +0000 (UTC) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add a sample program for driving fsopen/fsmount. Signed-off-by: David Howells --- samples/fsmount/test-fsmount.c | 92 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 92 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..30caad8e05a3 --- /dev/null +++ b/samples/fsmount/test-fsmount.c @@ -0,0 +1,92 @@ +/* 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 +#include + +#define PR_ERRMSG_ENABLE 48 +#define PR_ERRMSG_READ 49 + +#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, perr; + + do { + err = errno; + errno = 0; + n = prctl(PR_ERRMSG_READ, buf, sizeof(buf)); + perr = errno; + errno = err; + if (n > 0) { + fprintf(stderr, "Error: '%s': %*.*s: %m\n", s, n, n, buf); + } else { + fprintf(stderr, "%s: %m\n", s); + } + } while (perr == 0); + 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, + unsigned int at_flags, unsigned int flags) +{ + return syscall(334, fsfd, dfd, path, at_flags, flags); +} + +int main() +{ + int mfd; + + if (prctl(PR_ERRMSG_ENABLE, 1) < 0) { + perror("prctl/en"); + exit(1); + } + + /* Mount an NFS filesystem */ + mfd = fsopen("nfs4", -1, 0); + if (mfd == -1) { + perror("fsopen"); + exit(1); + } + + E_write(mfd, "s 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, "x create"); + if (fsmount(mfd, AT_FDCWD, "/mnt", 0, 0) < 0) + mount_error(mfd, "fsmount"); + E(close(mfd)); + + exit(0); +}