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/*
* Copyright (c) 1997-1999 Erez Zadok
* Copyright (c) 1990 Jan-Simon Pendry
* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry at Imperial College, London.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgment:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* %W% (Berkeley) %G%
*
* $Id: amfs_nfsl.c,v 1.3 1999/01/10 21:53:42 ezk Exp $
*
*/
/*
* NFSL: Network file system with local existence check. If the local
* path denoted by $rfs exists, it behaves as type:=link.
*
* Example:
* pkg type:=nfsl;rhost:=jonny;rfs:=/n/johnny/src/pkg;fs:=${rfs}
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>
#include <amd.h>
/* forward declarations */
static char *amfs_nfsl_match(am_opts *fo);
static int amfs_nfsl_init(mntfs *mf);
static int amfs_nfsl_fmount(mntfs *mf);
static int amfs_nfsl_fumount(mntfs *mf);
static void amfs_nfsl_umounted(am_node *mp);
static fserver *amfs_nfsl_ffserver(mntfs *mf);
/*
* NFS-Link operations
*/
am_ops amfs_nfsl_ops =
{
"nfsl", /* name of file system */
amfs_nfsl_match, /* match */
amfs_nfsl_init, /* initialize */
amfs_auto_fmount, /* mount vnode */
amfs_nfsl_fmount, /* mount vfs */
amfs_auto_fumount, /* unmount vnode */
amfs_nfsl_fumount, /* unmount VFS */
amfs_error_lookuppn, /* lookup path-name */
amfs_error_readdir, /* read directory */
0, /* read link */
0, /* after-mount extra actions */
amfs_nfsl_umounted, /* after-umount extra actions */
amfs_nfsl_ffserver, /* find a file server */
FS_MKMNT | FS_BACKGROUND | FS_AMQINFO /* flags */
};
/*
* Check that f/s has all needed fields.
* Returns: matched string if found, NULL otherwise.
*/
static char *
amfs_nfsl_match(am_opts *fo)
{
char *cp = fo->opt_fs;
char *ho = fo->opt_rhost;
struct stat stb;
if (!cp || !ho) {
plog(XLOG_USER, "amfs_nfsl: host $fs and $rhost must be specified");
return NULL;
}
/*
* If this host is not the same as $rhost, or if link does not exist,
* perform nfs_match(), same as for type:=nfs.
* If link value exists (or same host), then perform amfs_link_match(),
* same as for linkx.
*/
if (!STRCEQ(ho, am_get_hostname())) {
plog(XLOG_INFO, "amfs_nfsl: \"%s\" is not local host, using type:=nfs", ho);
return nfs_match(fo);
} else if (lstat(cp, &stb) < 0) {
plog(XLOG_INFO, "amfs_nfsl: \"%s\" does not exist, using type:=nfs", cp);
return nfs_match(fo);
} else {
plog(XLOG_INFO, "amfs_nfsl: \"%s\" exists, using type:=link", cp);
return amfs_link_match(fo);
}
}
/*
* Initialize.
* Returns: 0 if OK, non-zero (errno) if failed.
*/
static int
amfs_nfsl_init(mntfs *mf)
{
/*
* If a link, do nothing (same as type:=link).
* If non-link, do nfs_init (same as type:=nfs).
*/
if (mf->mf_flags & MFF_NFSLINK) {
return 0;
} else {
return nfs_init(mf);
}
}
/*
* Mount vfs.
* Returns: 0 if OK, non-zero (errno) if failed.
*/
static int
amfs_nfsl_fmount(mntfs *mf)
{
/*
* If a link, do run amfs_link_fmount() (same as type:=link)
* If non-link, do nfs_fmount (same as type:=nfs).
*/
if (mf->mf_flags & MFF_NFSLINK) {
return amfs_link_fmount(mf);
} else {
return nfs_fmount(mf);
}
}
/*
* Unmount VFS.
* Returns: 0 if OK, non-zero (errno) if failed.
*/
static int
amfs_nfsl_fumount(mntfs *mf)
{
/*
* If a link, do run amfs_link_fumount() (same as type:=link)
* If non-link, do nfs_fumount (same as type:=nfs).
*/
if (mf->mf_flags & MFF_NFSLINK) {
return amfs_link_fumount(mf);
} else {
return nfs_fumount(mf);
}
}
/*
* Async unmount callback function.
* After the base umount() succeeds, we may want to take extra actions,
* such as informing remote mount daemons that we've unmounted them.
* See amfs_auto_umounted(), host_umounted(), nfs_umounted().
*/
static void
amfs_nfsl_umounted(am_node *mp)
{
mntfs *mf = mp->am_mnt;
/*
* If a link, do nothing (same as type:=link)
* If non-link, do nfs_fumount (same as type:=nfs).
*/
if (mf->mf_flags & MFF_NFSLINK) {
return;
} else {
nfs_umounted(mp);
/*
* MUST remove mount point directories, because if they remain
* behind, the next nfsl access will think they are a link
* type file system, and not NFS! (when it performs link target
* existence test)
*/
if (mf->mf_flags & MFF_MKMNT)
rmdirs(mf->mf_mount);
return;
}
}
/*
* Find a file server.
* Returns: fserver of found server, or NULL if not found.
*/
static fserver *
amfs_nfsl_ffserver(mntfs *mf)
{
char *cp = mf->mf_fo->opt_fs;
char *ho = mf->mf_fo->opt_rhost;
struct stat stb;
/*
* If this host is not the same as $rhost, or if link does not exist,
* perform find_nfs_srvr(), same as for type:=nfs.
* If link value exists (or same host), then perform
* find_amfs_auto_srvr(), same as for linkx.
*/
if (!STRCEQ(ho, am_get_hostname()) || lstat(cp, &stb) < 0) {
return find_nfs_srvr(mf);
} else {
mf->mf_flags |= MFF_NFSLINK;
return find_amfs_auto_srvr(mf);
}
}
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