From: David Howells <dhowells@redhat.com>
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
Subject: [PATCH 6/9] Sample program for driving fsopen/fsmount
Date: Wed, 03 May 2017 17:05:24 +0100 [thread overview]
Message-ID: <149382752396.30481.8468912363685051016.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <149382747487.30481.15428192741961545429.stgit@warthog.procyon.org.uk>
---
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 <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/wait.h>
+
+#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);
+}
next prev parent reply other threads:[~2017-05-03 16:05 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-03 16:04 [RFC][PATCH 0/9] VFS: Introduce mount context David Howells
2017-05-03 16:04 ` [PATCH 1/9] Provide a function to create a NUL-terminated string from unterminated data David Howells
2017-05-03 16:55 ` Jeff Layton
2017-05-03 19:26 ` Rasmus Villemoes
2017-05-03 20:13 ` David Howells
2017-05-03 16:04 ` [PATCH 2/9] Clean up whitespace in fs/namespace.c David Howells
2017-05-03 16:04 ` [PATCH 3/9] VFS: Introduce a mount context David Howells
2017-05-03 18:13 ` Jeff Layton
2017-05-03 18:26 ` Joe Perches
2017-05-03 20:38 ` Matthew Wilcox
2017-05-03 21:36 ` Joe Perches
2017-05-04 6:28 ` Julia Lawall
2017-05-03 21:17 ` David Howells
2017-05-03 18:37 ` David Howells
2017-05-03 18:43 ` Joe Perches
2017-05-03 20:11 ` David Howells
2017-05-04 9:27 ` David Howells
2017-05-04 14:34 ` Joe Perches
2017-05-03 21:43 ` Rasmus Villemoes
2017-05-04 10:22 ` David Howells
2017-05-08 15:05 ` Miklos Szeredi
2017-05-08 22:57 ` David Howells
2017-05-09 8:03 ` Miklos Szeredi
2017-05-10 12:41 ` Karel Zak
2017-05-09 9:32 ` David Howells
2017-05-09 11:04 ` Miklos Szeredi
2017-05-09 9:41 ` David Howells
2017-05-09 12:02 ` Miklos Szeredi
2017-05-09 18:51 ` Jeff Layton
2017-05-10 7:24 ` Miklos Szeredi
2017-05-10 8:05 ` David Howells
2017-05-10 13:20 ` Jeff Layton
2017-05-10 13:30 ` Miklos Szeredi
2017-05-10 13:33 ` Miklos Szeredi
2017-05-10 13:48 ` Jeff Layton
2017-05-12 8:15 ` Miklos Szeredi
2017-05-10 13:31 ` David Howells
2017-05-10 13:37 ` Jeff Layton
2017-05-09 9:56 ` David Howells
2017-05-09 12:38 ` Miklos Szeredi
2017-05-03 16:05 ` [PATCH 4/9] Implement fsopen() to prepare for a mount David Howells
2017-05-03 18:37 ` Jeff Layton
2017-05-03 18:41 ` David Howells
2017-05-03 20:44 ` Rasmus Villemoes
2017-05-04 10:40 ` Karel Zak
2017-05-04 12:55 ` David Howells
2017-05-04 12:58 ` David Howells
2017-05-04 13:06 ` David Howells
2017-05-04 13:34 ` Karel Zak
2017-05-09 18:40 ` Jeff Layton
2017-05-08 15:10 ` Miklos Szeredi
2017-05-08 23:09 ` David Howells
2017-05-03 16:05 ` [PATCH 5/9] Implement fsmount() to effect a pre-configured mount David Howells
2017-05-03 16:05 ` David Howells [this message]
2017-05-03 16:05 ` [PATCH 7/9] procfs: Move proc_fill_super() to fs/proc/root.c David Howells
2017-05-03 16:05 ` [PATCH 8/9] proc: Support the mount context in procfs David Howells
2017-05-03 16:05 ` [PATCH 9/9] NFS: Support the mount context and fsopen() David Howells
2017-05-03 16:44 ` [RFC][PATCH 0/9] VFS: Introduce mount context Jeff Layton
2017-05-03 16:50 ` David Howells
2017-05-03 17:27 ` Jeff Layton
2017-05-05 14:35 ` Miklos Szeredi
2017-05-05 15:47 ` David Howells
2017-05-08 8:25 ` Miklos Szeredi
2017-05-08 8:35 ` David Howells
2017-05-08 8:43 ` Miklos Szeredi
2017-05-08 17:03 ` Djalal Harouni
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=149382752396.30481.8468912363685051016.stgit@warthog.procyon.org.uk \
--to=dhowells@redhat.com \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-nfs@vger.kernel.org \
--cc=mszeredi@redhat.com \
--cc=viro@zeniv.linux.org.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).