/*      $NetBSD: amfs_nfsl.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $       */

/*
* Copyright (c) 1997-2014 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. 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 && fo->opt_sublink[0])
   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()) && !STRCEQ(ho, hostd)) {
   plog(XLOG_INFO, "amfs_nfsl: \"%s\" is not the local host \"%s\", "
       "or \"%s\" using type:=nfs", ho, am_get_hostname(), hostd);
   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, *ho;
 struct stat stb;

 if (mf->mf_fo == NULL) {
   plog(XLOG_ERROR, "%s: NULL mf_fo", __func__);
   return NULL;
 }
 ho = mf->mf_fo->opt_rhost;

 if (mf->mf_fo->opt_sublink && mf->mf_fo->opt_sublink[0])
   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()) &&
      !STRCEQ(ho, hostd)) || 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);
 }
}

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.