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/*
* Copyright (c) 1997-2006 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.
*
*
* File: am-utils/amd/amfs_nfsl.c
*
*/
/*
* 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_mount(am_node *mp, mntfs *mf);
static int amfs_nfsl_umount(am_node *mp, mntfs *mf);
static void amfs_nfsl_umounted(mntfs *mf);
static fserver *amfs_nfsl_ffserver(mntfs *mf);
/*
* NFS-Link operations
*/
am_ops amfs_nfsl_ops =
{
"nfsl",
amfs_nfsl_match,
amfs_nfsl_init,
amfs_nfsl_mount,
amfs_nfsl_umount,
amfs_error_lookup_child,
amfs_error_mount_child,
amfs_error_readdir,
0, /* amfs_nfsl_readlink */
0, /* amfs_nfsl_mounted */
amfs_nfsl_umounted,
amfs_nfsl_ffserver,
0, /* amfs_nfsl_get_wchan */
FS_MKMNT | FS_BACKGROUND | FS_AMQINFO, /* nfs_fs_flags */
#ifdef HAVE_FS_AUTOFS
AUTOFS_NFSL_FS_FLAGS,
#endif /* HAVE_FS_AUTOFS */
};
/*
* 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;
char *ho = fo->opt_rhost;
char *retval;
struct stat stb;
if (fo->opt_sublink)
cp = fo->opt_sublink;
else
cp = fo->opt_fs;
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,
* call nfs_ops.fs_match().
* If link value exists (or same host), call amfs_link_ops.fs_match().
*/
if (!STRCEQ(ho, am_get_hostname())) {
plog(XLOG_INFO, "amfs_nfsl: \"%s\" is not local host, using type:=nfs", ho);
retval = nfs_ops.fs_match(fo);
} else if (lstat(cp, &stb) < 0) {
plog(XLOG_INFO, "amfs_nfsl: \"%s\" does not exist, using type:=nfs", cp);
retval = nfs_ops.fs_match(fo);
} else {
plog(XLOG_INFO, "amfs_nfsl: \"%s\" exists, using type:=link", cp);
retval = amfs_link_ops.fs_match(fo);
}
return retval;
}
/*
* Initialize.
* Returns: 0 if OK, non-zero (errno) if failed.
*/
static int
amfs_nfsl_init(mntfs *mf)
{
int ret = 0;
if (mf->mf_flags & MFF_NFSLINK) {
if (amfs_link_ops.fs_init)
ret = amfs_link_ops.fs_init(mf);
} else {
if (nfs_ops.fs_init)
ret = nfs_ops.fs_init(mf);
}
return ret;
}
/*
* Mount vfs.
* Returns: 0 if OK, non-zero (errno) if failed.
*/
static int
amfs_nfsl_mount(am_node *mp, mntfs *mf)
{
int ret = 0;
if (mf->mf_flags & MFF_NFSLINK) {
if (amfs_link_ops.mount_fs)
ret = amfs_link_ops.mount_fs(mp, mf);
} else {
if (nfs_ops.mount_fs)
ret = nfs_ops.mount_fs(mp, mf);
}
return ret;
}
/*
* Unmount VFS.
* Returns: 0 if OK, non-zero (errno) if failed.
*/
static int
amfs_nfsl_umount(am_node *mp, mntfs *mf)
{
int ret = 0;
if (mf->mf_flags & MFF_NFSLINK) {
if (amfs_link_ops.umount_fs)
ret = amfs_link_ops.umount_fs(mp, mf);
} else {
if (nfs_ops.umount_fs)
ret = nfs_ops.umount_fs(mp, mf);
}
return ret;
}
/*
* 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(mntfs *mf)
{
if (mf->mf_flags & MFF_NFSLINK) {
if (amfs_link_ops.umounted)
amfs_link_ops.umounted(mf);
} else {
if (nfs_ops.umounted)
nfs_ops.umounted(mf);
}
}
/*
* Find a file server.
* Returns: fserver of found server, or NULL if not found.
*/
static fserver *
amfs_nfsl_ffserver(mntfs *mf)
{
char *cp;
char *ho = mf->mf_fo->opt_rhost;
struct stat stb;
if (mf->mf_fo->opt_sublink)
cp = mf->mf_fo->opt_sublink;
else
cp = mf->mf_fo->opt_fs;
/*
* If this host is not the same as $rhost, or if link does not exist,
* call amfs_link_ops.ffserver().
* If link value exists (or same host), then call ops_nfs.ffserver().
*/
if (!STRCEQ(ho, am_get_hostname()) || lstat(cp, &stb) < 0) {
return nfs_ops.ffserver(mf);
} else {
mf->mf_flags |= MFF_NFSLINK;
/* remove the FS_MKMNT flag, we don't want amd touching the mountpoint */
mf->mf_fsflags &= ~FS_MKMNT;
return amfs_link_ops.ffserver(mf);
}
}
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