238 lines
6.8 KiB
C
238 lines
6.8 KiB
C
/*
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* Copyright (c) 1997-2003 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_nfsl.c,v 1.4.2.3 2002/12/27 22:44:31 ezk Exp $
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*
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*/
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/*
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* NFSL: Network file system with local existence check. If the local
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* path denoted by $rfs exists, it behaves as type:=link.
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*
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* Example:
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* pkg type:=nfsl;rhost:=jonny;rfs:=/n/johnny/src/pkg;fs:=${rfs}
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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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/* forward declarations */
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static char *amfs_nfsl_match(am_opts *fo);
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static int amfs_nfsl_init(mntfs *mf);
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static int amfs_nfsl_fmount(mntfs *mf);
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static int amfs_nfsl_fumount(mntfs *mf);
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static void amfs_nfsl_umounted(am_node *mp);
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static fserver *amfs_nfsl_ffserver(mntfs *mf);
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/*
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* NFS-Link operations
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*/
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am_ops amfs_nfsl_ops =
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{
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"nfsl", /* name of file system */
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amfs_nfsl_match, /* match */
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amfs_nfsl_init, /* initialize */
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amfs_auto_fmount, /* mount vnode */
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amfs_nfsl_fmount, /* mount vfs */
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amfs_auto_fumount, /* unmount vnode */
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amfs_nfsl_fumount, /* unmount VFS */
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amfs_error_lookuppn, /* lookup path-name */
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amfs_error_readdir, /* read directory */
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0, /* read link */
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0, /* after-mount extra actions */
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amfs_nfsl_umounted, /* after-umount extra actions */
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amfs_nfsl_ffserver, /* find a file server */
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FS_MKMNT | FS_BACKGROUND | FS_AMQINFO /* flags */
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};
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/*
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* Check that f/s has all needed fields.
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* Returns: matched string if found, NULL otherwise.
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*/
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static char *
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amfs_nfsl_match(am_opts *fo)
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{
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char *cp = fo->opt_fs;
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char *ho = fo->opt_rhost;
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struct stat stb;
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if (!cp || !ho) {
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plog(XLOG_USER, "amfs_nfsl: host $fs and $rhost must be specified");
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return NULL;
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}
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/*
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* If this host is not the same as $rhost, or if link does not exist,
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* perform nfs_match(), same as for type:=nfs.
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* If link value exists (or same host), then perform amfs_link_match(),
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* same as for linkx.
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*/
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if (!STRCEQ(ho, am_get_hostname())) {
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plog(XLOG_INFO, "amfs_nfsl: \"%s\" is not local host, using type:=nfs", ho);
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return nfs_match(fo);
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} else if (lstat(cp, &stb) < 0) {
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plog(XLOG_INFO, "amfs_nfsl: \"%s\" does not exist, using type:=nfs", cp);
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return nfs_match(fo);
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} else {
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plog(XLOG_INFO, "amfs_nfsl: \"%s\" exists, using type:=link", cp);
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return amfs_link_match(fo);
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}
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}
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/*
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* Initialize.
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* Returns: 0 if OK, non-zero (errno) if failed.
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*/
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static int
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amfs_nfsl_init(mntfs *mf)
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{
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/*
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* If a link, do nothing (same as type:=link).
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* If non-link, do nfs_init (same as type:=nfs).
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*/
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if (mf->mf_flags & MFF_NFSLINK) {
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return 0;
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} else {
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return nfs_init(mf);
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}
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}
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/*
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* Mount vfs.
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* Returns: 0 if OK, non-zero (errno) if failed.
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*/
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static int
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amfs_nfsl_fmount(mntfs *mf)
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{
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/*
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* If a link, do run amfs_link_fmount() (same as type:=link)
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* If non-link, do nfs_fmount (same as type:=nfs).
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*/
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if (mf->mf_flags & MFF_NFSLINK) {
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return amfs_link_fmount(mf);
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} else {
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return nfs_fmount(mf);
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}
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}
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/*
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* Unmount VFS.
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* Returns: 0 if OK, non-zero (errno) if failed.
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*/
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static int
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amfs_nfsl_fumount(mntfs *mf)
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{
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/*
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* If a link, do run amfs_link_fumount() (same as type:=link)
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* If non-link, do nfs_fumount (same as type:=nfs).
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*/
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if (mf->mf_flags & MFF_NFSLINK) {
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return amfs_link_fumount(mf);
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} else {
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return nfs_fumount(mf);
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}
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}
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/*
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* Async unmount callback function.
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* After the base umount() succeeds, we may want to take extra actions,
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* such as informing remote mount daemons that we've unmounted them.
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* See amfs_auto_umounted(), host_umounted(), nfs_umounted().
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*/
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static void
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amfs_nfsl_umounted(am_node *mp)
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{
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mntfs *mf = mp->am_mnt;
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/*
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* If a link, do nothing (same as type:=link)
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* If non-link, do nfs_fumount (same as type:=nfs).
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*/
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if (mf->mf_flags & MFF_NFSLINK) {
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return;
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} else {
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nfs_umounted(mp);
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/*
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* MUST remove mount point directories, because if they remain
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* behind, the next nfsl access will think they are a link
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* type file system, and not NFS! (when it performs link target
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* existence test)
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*/
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if (mf->mf_flags & MFF_MKMNT)
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rmdirs(mf->mf_mount);
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return;
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}
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}
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/*
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* Find a file server.
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* Returns: fserver of found server, or NULL if not found.
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*/
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static fserver *
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amfs_nfsl_ffserver(mntfs *mf)
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{
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char *cp = mf->mf_fo->opt_fs;
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char *ho = mf->mf_fo->opt_rhost;
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struct stat stb;
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/*
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* If this host is not the same as $rhost, or if link does not exist,
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* perform find_nfs_srvr(), same as for type:=nfs.
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* If link value exists (or same host), then perform
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* find_amfs_auto_srvr(), same as for linkx.
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*/
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if (!STRCEQ(ho, am_get_hostname()) || lstat(cp, &stb) < 0) {
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return find_nfs_srvr(mf);
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} else {
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mf->mf_flags |= MFF_NFSLINK;
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return find_amfs_auto_srvr(mf);
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}
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}
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