361 lines
11 KiB
C
361 lines
11 KiB
C
/* $NetBSD: amfs_toplvl.c,v 1.1.1.1 2000/06/07 00:52:22 dogcow Exp $ */
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/*
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* Copyright (c) 1997-2000 Erez Zadok
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* Copyright (c) 1990 Jan-Simon Pendry
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* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry at Imperial College, London.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgment:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* %W% (Berkeley) %G%
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*
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* Id: amfs_toplvl.c,v 1.7 2000/02/07 08:34:50 ezk Exp
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*
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*/
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/*
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* Top-level file system
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif /* HAVE_CONFIG_H */
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#include <am_defs.h>
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#include <amd.h>
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/****************************************************************************
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*** FORWARD DEFINITIONS ***
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****************************************************************************/
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/****************************************************************************
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*** OPS STRUCTURES ***
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****************************************************************************/
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am_ops amfs_toplvl_ops =
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{
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"toplvl",
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amfs_auto_match,
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0, /* amfs_auto_init */
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amfs_toplvl_mount,
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0,
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amfs_toplvl_umount,
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0,
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amfs_auto_lookuppn,
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amfs_auto_readdir, /* browsable version of readdir() */
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0, /* amfs_toplvl_readlink */
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amfs_toplvl_mounted,
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0, /* amfs_toplvl_umounted */
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find_amfs_auto_srvr,
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FS_MKMNT | FS_NOTIMEOUT | FS_BACKGROUND | FS_AMQINFO | FS_DIRECTORY
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};
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/****************************************************************************
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*** FUNCTIONS ***
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****************************************************************************/
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/*
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* Mount an automounter directory.
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* The automounter is connected into the system
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* as a user-level NFS server. mount_amfs_toplvl constructs
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* the necessary NFS parameters to be given to the
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* kernel so that it will talk back to us.
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*
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* NOTE: automounter mounts in themselves are using NFS Version 2.
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*/
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static int
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mount_amfs_toplvl(char *dir, char *opts)
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{
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char fs_hostname[MAXHOSTNAMELEN + MAXPATHLEN + 1];
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int retry, error, genflags;
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mntent_t mnt;
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nfs_args_t nfs_args;
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am_nfs_fh *fhp;
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am_nfs_handle_t anh;
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MTYPE_TYPE type = MOUNT_TYPE_NFS;
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#ifndef HAVE_TRANSPORT_TYPE_TLI
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u_short port;
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struct sockaddr_in sin;
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#endif /* not HAVE_TRANSPORT_TYPE_TLI */
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memset((voidp) &mnt, 0, sizeof(mnt));
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mnt.mnt_dir = dir;
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mnt.mnt_fsname = pid_fsname;
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mnt.mnt_opts = opts;
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/*
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* Make sure that amd's top-level NFS mounts are hidden by default
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* from df.
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* If they don't appear to support the either the "ignore" mnttab
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* option entry, or the "auto" one, set the mount type to "nfs".
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*/
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mnt.mnt_type = HIDE_MOUNT_TYPE;
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retry = hasmntval(&mnt, MNTTAB_OPT_RETRY);
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if (retry <= 0)
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retry = 2; /* XXX */
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/*
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* SET MOUNT ARGS
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*/
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/*
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* get fhandle of remote path for automount point
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*/
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fhp = root_fh(dir);
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if (!fhp) {
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plog(XLOG_FATAL, "Can't find root file handle for %s", dir);
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return EINVAL;
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}
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#ifndef HAVE_TRANSPORT_TYPE_TLI
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/*
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* Create sockaddr to point to the local machine. 127.0.0.1
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* is not used since that will not work in HP-UX clusters and
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* this is no more expensive.
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*/
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memset((voidp) &sin, 0, sizeof(sin));
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sin.sin_family = AF_INET;
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sin.sin_addr = myipaddr;
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port = hasmntval(&mnt, MNTTAB_OPT_PORT);
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if (port) {
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sin.sin_port = htons(port);
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} else {
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plog(XLOG_ERROR, "no port number specified for %s", dir);
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return EINVAL;
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}
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#endif /* not HAVE_TRANSPORT_TYPE_TLI */
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/*
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* Make a ``hostname'' string for the kernel
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*/
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sprintf(fs_hostname, "pid%ld@%s:%s",
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(long) (foreground ? am_mypid : getppid()),
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am_get_hostname(),
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dir);
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/*
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* Most kernels have a name length restriction (64 bytes)...
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*/
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if (strlen(fs_hostname) >= MAXHOSTNAMELEN)
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strcpy(fs_hostname + MAXHOSTNAMELEN - 3, "..");
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#ifdef HOSTNAMESZ
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/*
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* ... and some of these restrictions are 32 bytes (HOSTNAMESZ)
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* If you need to get the definition for HOSTNAMESZ found, you may
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* add the proper header file to the conf/nfs_prot/nfs_prot_*.h file.
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*/
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if (strlen(fs_hostname) >= HOSTNAMESZ)
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strcpy(fs_hostname + HOSTNAMESZ - 3, "..");
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#endif /* HOSTNAMESZ */
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/*
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* Finally we can compute the mount genflags set above,
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* and add any automounter specific flags.
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*/
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genflags = compute_mount_flags(&mnt);
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genflags |= compute_automounter_mount_flags(&mnt);
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/* setup the many fields and flags within nfs_args */
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memmove(&anh.v2.fhs_fh, fhp, sizeof(*fhp));
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#ifdef HAVE_TRANSPORT_TYPE_TLI
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compute_nfs_args(&nfs_args,
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&mnt,
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genflags,
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nfsncp,
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NULL, /* remote host IP addr is set below */
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NFS_VERSION, /* version 2 */
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"udp",
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&anh,
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fs_hostname,
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pid_fsname);
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/*
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* IMPORTANT: set the correct IP address AFTERWARDS. It cannot
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* be done using the normal mechanism of compute_nfs_args(), because
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* that one will allocate a new address and use NFS_SA_DREF() to copy
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* parts to it, while assuming that the ip_addr passed is always
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* a "struct sockaddr_in". That assumption is incorrect on TLI systems,
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* because they define a special macro HOST_SELF which is DIFFERENT
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* than localhost (127.0.0.1)!
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*/
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nfs_args.addr = &nfsxprt->xp_ltaddr;
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#else /* not HAVE_TRANSPORT_TYPE_TLI */
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compute_nfs_args(&nfs_args,
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&mnt,
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genflags,
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&sin,
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NFS_VERSION, /* version 2 */
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"udp",
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&anh,
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fs_hostname,
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pid_fsname);
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#endif /* not HAVE_TRANSPORT_TYPE_TLI */
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/*************************************************************************
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* NOTE: while compute_nfs_args() works ok for regular NFS mounts *
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* the toplvl one is not, and so some options must be corrected by hand *
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* more carefully, *after* compute_nfs_args() runs. *
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*************************************************************************/
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compute_automounter_nfs_args(&nfs_args, &mnt);
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/* This is it! Here we try to mount amd on its mount points */
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#ifdef DEBUG
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amuDebug(D_TRACE) {
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print_nfs_args(&nfs_args, 0);
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plog(XLOG_DEBUG, "Generic mount flags 0x%x", genflags);
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}
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#endif /* DEBUG */
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error = mount_fs(&mnt, genflags, (caddr_t) &nfs_args, retry, type,
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0, NULL, mnttab_file_name);
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#ifdef HAVE_TRANSPORT_TYPE_TLI
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free_knetconfig(nfs_args.knconf);
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/*
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* local automounter mounts do not allocate a special address, so
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* no need to XFREE(nfs_args.addr) under TLI.
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*/
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#endif /* HAVE_TRANSPORT_TYPE_TLI */
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return error;
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}
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/*
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* Mount the top-level
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*/
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int
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amfs_toplvl_mount(am_node *mp)
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{
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mntfs *mf = mp->am_mnt;
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struct stat stb;
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char opts[256], preopts[256];
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int error;
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char *mnttype;
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/*
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* Mounting the automounter.
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* Make sure the mount directory exists, construct
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* the mount options and call the mount_amfs_toplvl routine.
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*/
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if (stat(mp->am_path, &stb) < 0) {
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return errno;
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} else if ((stb.st_mode & S_IFMT) != S_IFDIR) {
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plog(XLOG_WARNING, "%s is not a directory", mp->am_path);
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return ENOTDIR;
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}
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if (mf->mf_ops == &amfs_toplvl_ops)
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mnttype = "indirect";
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else if (mf->mf_ops == &amfs_direct_ops)
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mnttype = "direct";
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#ifdef HAVE_AMU_FS_UNION
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else if (mf->mf_ops == &amfs_union_ops)
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mnttype = "union";
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#endif /* HAVE_AMU_FS_UNION */
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else
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mnttype = "auto";
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/*
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* Construct some mount options:
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*
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* Tack on magic map=<mapname> option in mtab to emulate
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* SunOS automounter behavior.
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*/
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preopts[0] = '\0';
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#ifdef MNTTAB_OPT_INTR
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strcat(preopts, MNTTAB_OPT_INTR);
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strcat(preopts, ",");
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#endif /* MNTTAB_OPT_INTR */
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#ifdef MNTTAB_OPT_IGNORE
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strcat(preopts, MNTTAB_OPT_IGNORE);
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strcat(preopts, ",");
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#endif /* MNTTAB_OPT_IGNORE */
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sprintf(opts, "%s%s,%s=%d,%s=%d,%s=%d,%s,map=%s",
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preopts,
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MNTTAB_OPT_RW,
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MNTTAB_OPT_PORT, nfs_port,
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MNTTAB_OPT_TIMEO, gopt.amfs_auto_timeo,
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MNTTAB_OPT_RETRANS, gopt.amfs_auto_retrans,
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mnttype, mf->mf_info);
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/* now do the mount */
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error = mount_amfs_toplvl(mf->mf_mount, opts);
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if (error) {
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errno = error;
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plog(XLOG_FATAL, "mount_amfs_toplvl: %m");
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return error;
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}
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return 0;
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}
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void
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amfs_toplvl_mounted(mntfs *mf)
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{
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amfs_auto_mkcacheref(mf);
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}
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/*
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* Unmount a top-level automount node
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*/
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int
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amfs_toplvl_umount(am_node *mp)
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{
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int error;
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struct stat stb;
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again:
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/*
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* The lstat is needed if this mount is type=direct.
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* When that happens, the kernel cache gets confused
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* between the underlying type (dir) and the mounted
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* type (link) and so needs to be re-synced before
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* the unmount. This is all because the unmount system
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* call follows links and so can't actually unmount
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* a link (stupid!). It was noted that doing an ls -ld
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* of the mount point to see why things were not working
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* actually fixed the problem - so simulate an ls -ld here.
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*/
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if (lstat(mp->am_path, &stb) < 0) {
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#ifdef DEBUG
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dlog("lstat(%s): %m", mp->am_path);
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#endif /* DEBUG */
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}
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error = UMOUNT_FS(mp->am_path, mnttab_file_name);
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if (error == EBUSY) {
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plog(XLOG_WARNING, "amfs_toplvl_unmount retrying %s in 1s", mp->am_path);
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sleep(1); /* XXX */
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goto again;
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}
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return error;
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}
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