8dea6eb551
The pfs_info mutex is only needed to lock pi_unrhdr. Everything else
in struct pfs_info is modified only while Giant is held (during
vfs_init() / vfs_uninit()); add assertions to that effect.
Simplify pfs_destroy somewhat.
Remove superfluous arguments from pfs_fileno_{alloc,free}(), and the
assertions which were added in the previous commit to ensure they were
consistent.
Assert that Giant is held while the vnode cache is initialized and
destroyed. Also assert that the cache is empty when it is destroyed.
Rename the vnode cache mutex for consistency.
Fix a long-standing bug in pfs_getattr(): it would uncritically return
the node's pn_fileno as st_ino. This would result in st_ino being 0
if the node had not previously been visited by readdir(), and also in
an incorrect st_ino for process directories and any files contained
therein. Correct this by abstracting the fileno manipulations
previously done in pfs_readdir() into a new function, pfs_fileno(),
which is used by both pfs_getattr() and pfs_readdir().
156 lines
4.1 KiB
C
156 lines
4.1 KiB
C
/*-
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* Copyright (c) 2001 Dag-Erling Coïdan 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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__FBSDID("$FreeBSD$");
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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_assert(&Giant, MA_OWNED);
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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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mtx_assert(&Giant, MA_OWNED);
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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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/* make sure our parent has a file number */
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if (pn->pn_parent && !pn->pn_parent->pn_fileno)
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pfs_fileno_alloc(pn->pn_parent);
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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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("pfstype_this node has no parent"));
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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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("pfstype_parent node has no parent"));
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if (pn->pn_parent == pn->pn_info->pi_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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("pfstype_parent node has no grandparent"));
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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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("pfs_fileno_alloc() called for pfstype_none node"));
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break;
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}
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#if 0
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printf("pfs_fileno_alloc(): %s: ", 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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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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