/*      $NetBSD: ops_TEMPLATE.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/ops_TEMPLATE.c
*
*/

/*
* An empty template for an amd pseudo filesystem "foofs".
*/

/*
* NOTE: if this is an Amd file system, prepend "amfs_" to all foofs symbols
* and renamed the file name to amfs_foofs.c.  If it is a native file system
* (such as pcfs, isofs, or ffs), then you can keep the names as is, and
* just rename the file to ops_foofs.c.
*/

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>
#include <amd.h>

/* forward declarations */
static char *foofs_match(am_opts *fo);
static int foofs_init(mntfs *mf);
static int foofs_mount(am_node *mp, mntfs *mf);
static int foofs_umount(am_node *mp, mntfs *mf);
static am_node *foofs_lookuppn(am_node *mp, char *fname, int *error_return, int op);
static int foofs_readdir(am_node *mp, void cookie, voidp dp, voidp ep, u_int count);
static am_node *foofs_readlink(am_node *mp, int *error_return);
static void foofs_mounted(am_node *am, mntfs *mf);
static void foofs_umounted(am_node *mp, mntfs *mf);
static fserver *foofs_ffserver(mntfs *mf);


/*
* Foofs operations.
* Define only those you need, others set to 0 (NULL)
*/
am_ops foofs_ops =
{
 "foofs",                      /* name of file system */
 foofs_match,                  /* match */
 foofs_init,                   /* initialize */
 foofs_mount,                  /* mount vnode */
 foofs_umount,                 /* unmount vnode */
 foofs_lookup_child,           /* lookup path-name */
 foofs_mount_child,            /* mount path-name */
 foofs_readdir,                /* read directory */
 foofs_readlink,               /* read link */
 foofs_mounted,                /* after-mount extra actions */
 foofs_umounted,               /* after-umount extra actions */
 foofs_ffserver,               /* find a file server */
 foofs_get_wchan,              /* return the waiting channel */
 FS_MKMNT | FS_BACKGROUND | FS_AMQINFO,        /* nfs_fs_flags */
#ifdef HAVE_FS_AUTOFS
 AUTOFS_TEMPLATE_FS_FLAGS,
#endif /* HAVE_FS_AUTOFS */
};


/*
* Check that f/s has all needed fields.
* Returns: matched string if found, NULL otherwise.
*/
static char *
foofs_match(am_opts *fo)
{
 char *cp = "fill this with a way to find the match";

 plog(XLOG_INFO, "entering foofs_match...");

 if (cp)
   return cp;                  /* OK */

 return NULL;                  /* not OK */
}


/*
* Initialize.
* Returns: 0 if OK, non-zero (errno) if failed.
*/
static int
foofs_init(mntfs *mf)
{
 int error = 0;

 plog(XLOG_INFO, "entering foofs_init...");

 error = EPERM;                /* XXX: fixme */
 return error;
}


/*
* Mount vnode.
* Returns: 0 if OK, non-zero (errno) if failed.
*/
static int
foofs_mount(am_node *mp)
{
 int error = 0;

 plog(XLOG_INFO, "entering foofs_mount...");

 error = EPERM;                /* XXX: fixme */
 return error;
}


/*
* Mount vfs.
* Returns: 0 if OK, non-zero (errno) if failed.
*/
static int
foofs_fmount(mntfs *mf)
{
 int error = 0;

 plog(XLOG_INFO, "entering foofs_fmount...");

 error = EPERM;                /* XXX: fixme */
 return error;
}


/*
* Unmount vnode.
* Returns: 0 if OK, non-zero (errno) if failed.
*/
static int
foofs_umount(am_node *mp)
{
 int error = 0;

 plog(XLOG_INFO, "entering foofs_umount...");

 error = EPERM;                /* XXX: fixme */
 return error;
}


/*
* Unmount VFS.
* Returns: 0 if OK, non-zero (errno) if failed.
*/
static int
foofs_fumount(mntfs *mf)
{
 int error = 0;

 plog(XLOG_INFO, "entering foofs_fumount...");

 error = EPERM;                /* XXX: fixme */
 return error;
}


/*
* Lookup path-name.
* Returns: the am_node that was found, or NULL if failed.
* If failed, also fills in errno in error_return.
*/
static am_node *
foofs_lookuppn(am_node *mp, char *fname, int *error_return, int op)
{
 int error = 0;

 plog(XLOG_INFO, "entering foofs_lookuppn...");

 error = EPERM;                        /* XXX: fixme */

 *error_return = error;
 return NULL;
}


/*
* Read directory.
* Returns: 0 if OK, non-zero (errno) if failed.
* If OK, fills in ep with chain of directory entries.
*/
static int
foofs_readdir(am_node *mp, void cookie, voidp dp, voidp ep, u_int count)
{
 int error = 0;

 plog(XLOG_INFO, "entering foofs_readdir...");

 error = EPERM;                /* XXX: fixme */
 return error;
}


/*
* Read link.
* Returns: am_node found, or NULL if not found.
* If failed, fills in errno in error_return.
*/
static am_node *
foofs_readlink(am_node *mp, int *error_return)
{
 int error = 0;

 plog(XLOG_INFO, "entering foofs_readlink...");

 error = EPERM;                        /* XXX: fixme */

 *error_return = error;
 return NULL;
}


/*
* Async mount callback function.
* After the base mount went OK, sometimes
* there are additional actions that are needed.  See union_mounted() and
* toplvl_mounted().
*/
static void
foofs_mounted(mntfs *mf)
{
 plog(XLOG_INFO, "entering foofs_mounted...");

 return;
}


/*
* 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
foofs_umounted(am_node *mp)
{
 plog(XLOG_INFO, "entering foofs_umounted...");

 return;
}


/*
* Find a file server.
* Returns: fserver of found server, or NULL if not found.
*/
static fserver *
foofs_ffserver(mntfs *mf)
{
 plog(XLOG_INFO, "entering foofs_ffserver...");

 return NULL;
}


/*
* Normally just return mf. Only inherit needs to do special tricks.
*/
static wchan_t *
foofs_get_wchan(mntfs *mf)
{
 plog(XLOG_INFO, "entering foofs_get_wchan...");

 return mf;
}

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