mirror of
https://github.com/freebsd/freebsd-src
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158 lines
4.2 KiB
C
158 lines
4.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2001 Dag-Erling Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include "opt_pseudofs.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <fs/pseudofs/pseudofs.h>
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#include <fs/pseudofs/pseudofs_internal.h>
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/*
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* Initialize fileno bitmap
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*/
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void
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pfs_fileno_init(struct pfs_info *pi)
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{
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mtx_init(&pi->pi_mutex, "pfs_fileno", NULL, MTX_DEF);
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pi->pi_unrhdr = new_unrhdr(3, INT_MAX / NO_PID, &pi->pi_mutex);
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}
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/*
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* Tear down fileno bitmap
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*/
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void
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pfs_fileno_uninit(struct pfs_info *pi)
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{
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delete_unrhdr(pi->pi_unrhdr);
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pi->pi_unrhdr = NULL;
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mtx_destroy(&pi->pi_mutex);
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}
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/*
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* Allocate a file number
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*/
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void
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pfs_fileno_alloc(struct pfs_node *pn)
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{
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if (pn->pn_parent)
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PFS_TRACE(("%s/%s", pn->pn_parent->pn_name, pn->pn_name));
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else
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PFS_TRACE(("%s", pn->pn_name));
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pfs_assert_not_owned(pn);
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switch (pn->pn_type) {
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case pfstype_root:
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/* root must always be 2 */
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pn->pn_fileno = 2;
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break;
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case pfstype_dir:
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case pfstype_file:
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case pfstype_symlink:
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case pfstype_procdir:
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pn->pn_fileno = alloc_unr(pn->pn_info->pi_unrhdr);
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break;
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case pfstype_this:
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KASSERT(pn->pn_parent != NULL,
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("%s(): pfstype_this node has no parent", __func__));
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pn->pn_fileno = pn->pn_parent->pn_fileno;
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break;
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case pfstype_parent:
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KASSERT(pn->pn_parent != NULL,
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("%s(): pfstype_parent node has no parent", __func__));
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if (pn->pn_parent->pn_type == pfstype_root) {
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pn->pn_fileno = pn->pn_parent->pn_fileno;
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break;
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}
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KASSERT(pn->pn_parent->pn_parent != NULL,
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("%s(): pfstype_parent node has no grandparent", __func__));
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pn->pn_fileno = pn->pn_parent->pn_parent->pn_fileno;
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break;
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case pfstype_none:
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KASSERT(0,
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("%s(): pfstype_none node", __func__));
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break;
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}
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#if 0
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printf("%s(): %s: ", __func__, pn->pn_info->pi_name);
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if (pn->pn_parent) {
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if (pn->pn_parent->pn_parent) {
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printf("%s/", pn->pn_parent->pn_parent->pn_name);
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}
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printf("%s/", pn->pn_parent->pn_name);
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}
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printf("%s -> %d\n", pn->pn_name, pn->pn_fileno);
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#endif
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}
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/*
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* Release a file number
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*/
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void
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pfs_fileno_free(struct pfs_node *pn)
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{
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pfs_assert_not_owned(pn);
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switch (pn->pn_type) {
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case pfstype_root:
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/* not allocated from unrhdr */
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return;
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case pfstype_dir:
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case pfstype_file:
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case pfstype_symlink:
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case pfstype_procdir:
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free_unr(pn->pn_info->pi_unrhdr, pn->pn_fileno);
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break;
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case pfstype_this:
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case pfstype_parent:
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/* ignore these, as they don't "own" their file number */
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break;
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case pfstype_none:
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KASSERT(0,
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("pfs_fileno_free() called for pfstype_none node"));
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break;
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}
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}
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