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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2001 Dag-Erling Coïdan Smørgrav
* All rights reserved.
*
* 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
* in this position and unchanged.
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_pseudofs.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <fs/pseudofs/pseudofs.h>
#include <fs/pseudofs/pseudofs_internal.h>
/*
* Initialize fileno bitmap
*/
void
pfs_fileno_init(struct pfs_info *pi)
{
mtx_init(&pi->pi_mutex, "pfs_fileno", NULL, MTX_DEF);
pi->pi_unrhdr = new_unrhdr(3, INT_MAX / NO_PID, &pi->pi_mutex);
}
/*
* Tear down fileno bitmap
*/
void
pfs_fileno_uninit(struct pfs_info *pi)
{
delete_unrhdr(pi->pi_unrhdr);
pi->pi_unrhdr = NULL;
mtx_destroy(&pi->pi_mutex);
}
/*
* Allocate a file number
*/
void
pfs_fileno_alloc(struct pfs_node *pn)
{
if (pn->pn_parent)
PFS_TRACE(("%s/%s", pn->pn_parent->pn_name, pn->pn_name));
else
PFS_TRACE(("%s", pn->pn_name));
pfs_assert_not_owned(pn);
switch (pn->pn_type) {
case pfstype_root:
/* root must always be 2 */
pn->pn_fileno = 2;
break;
case pfstype_dir:
case pfstype_file:
case pfstype_symlink:
case pfstype_procdir:
pn->pn_fileno = alloc_unr(pn->pn_info->pi_unrhdr);
break;
case pfstype_this:
KASSERT(pn->pn_parent != NULL,
("%s(): pfstype_this node has no parent", __func__));
pn->pn_fileno = pn->pn_parent->pn_fileno;
break;
case pfstype_parent:
KASSERT(pn->pn_parent != NULL,
("%s(): pfstype_parent node has no parent", __func__));
if (pn->pn_parent->pn_type == pfstype_root) {
pn->pn_fileno = pn->pn_parent->pn_fileno;
break;
}
KASSERT(pn->pn_parent->pn_parent != NULL,
("%s(): pfstype_parent node has no grandparent", __func__));
pn->pn_fileno = pn->pn_parent->pn_parent->pn_fileno;
break;
case pfstype_none:
KASSERT(0,
("%s(): pfstype_none node", __func__));
break;
}
#if 0
printf("%s(): %s: ", __func__, pn->pn_info->pi_name);
if (pn->pn_parent) {
if (pn->pn_parent->pn_parent) {
printf("%s/", pn->pn_parent->pn_parent->pn_name);
}
printf("%s/", pn->pn_parent->pn_name);
}
printf("%s -> %d\n", pn->pn_name, pn->pn_fileno);
#endif
}
/*
* Release a file number
*/
void
pfs_fileno_free(struct pfs_node *pn)
{
pfs_assert_not_owned(pn);
switch (pn->pn_type) {
case pfstype_root:
/* not allocated from unrhdr */
return;
case pfstype_dir:
case pfstype_file:
case pfstype_symlink:
case pfstype_procdir:
free_unr(pn->pn_info->pi_unrhdr, pn->pn_fileno);
break;
case pfstype_this:
case pfstype_parent:
/* ignore these, as they don't "own" their file number */
break;
case pfstype_none:
KASSERT(0,
("pfs_fileno_free() called for pfstype_none node"));
break;
}
}
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