d256e38414
condition was addressed in libpuffs by counting lookups. The fix assumes that cookies map to struct puffs_cookie, which has not been documented as a requirement for filesystems using libpuffs. As an example, we got burnt by this assumption in libp2k (kern/46734), and we fixed bit by actually mapping libp2k cookies to struct puffs_node. It is unlikely, but there may be third party filesystems that use cookies unmapped to struct puffs_node, and they were left broken for now. - we introduce a puffs_init() flag PUFFS_FLAG_PNCOOKIE that let filesystems inform libpuffs that they map cookies to struct puffs_node. Is that flag is used, the lookup/reclaim race condition fix is enabled. We enable the flag for libp2k. - filesystems that use puffs_pn_new() obviouslty use struct puffs_node and gain PUFFS_FLAG_PNCOOKIE automatically even if they did not specify it in puffs_init(). This include all our PUFFS filesystem in-tree except libp2k. - for filesystems not willing to use struct puffs_node, we introduce a reclaim2 vnop, which is reclaim with an additionnal lookup count argument. This vnop let the filesystem implement the lookup/reclaim race fix on its own.
203 lines
4.3 KiB
C
203 lines
4.3 KiB
C
/* $NetBSD: pnode.c,v 1.13 2012/08/16 09:25:43 manu Exp $ */
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/*
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* Copyright (c) 2006 Antti Kantee. 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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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if !defined(lint)
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__RCSID("$NetBSD: pnode.c,v 1.13 2012/08/16 09:25:43 manu Exp $");
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#endif /* !lint */
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#include <sys/types.h>
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#include <assert.h>
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#include <puffs.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "puffs_priv.h"
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/*
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* Well, you're probably wondering why this isn't optimized.
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* The reason is simple: my available time is not optimized for
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* size ... so please be patient ;)
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*/
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struct puffs_node *
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puffs_pn_new(struct puffs_usermount *pu, void *privdata)
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{
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struct puffs_node *pn;
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pn = calloc(1, sizeof(struct puffs_node));
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if (pn == NULL)
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return NULL;
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pn->pn_data = privdata;
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pn->pn_mnt = pu;
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puffs_vattr_null(&pn->pn_va);
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LIST_INSERT_HEAD(&pu->pu_pnodelst, pn, pn_entries);
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pu->pu_flags |= PUFFS_FLAG_PNCOOKIE;
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return pn;
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}
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void
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puffs_pn_remove(struct puffs_node *pn)
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{
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LIST_REMOVE(pn, pn_entries);
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pn->pn_flags |= PUFFS_NODE_REMOVED;
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}
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void
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puffs_pn_put(struct puffs_node *pn)
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{
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struct puffs_usermount *pu = pn->pn_mnt;
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pu->pu_pathfree(pu, &pn->pn_po);
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if ((pn->pn_flags & PUFFS_NODE_REMOVED) == 0)
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LIST_REMOVE(pn, pn_entries);
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free(pn);
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}
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/* walk list, rv can be used either to halt or to return a value */
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void *
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puffs_pn_nodewalk(struct puffs_usermount *pu, puffs_nodewalk_fn fn, void *arg)
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{
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struct puffs_node *pn_cur, *pn_next;
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void *rv;
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pn_cur = LIST_FIRST(&pu->pu_pnodelst);
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while (pn_cur) {
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pn_next = LIST_NEXT(pn_cur, pn_entries);
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rv = fn(pu, pn_cur, arg);
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if (rv)
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return rv;
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pn_cur = pn_next;
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}
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return NULL;
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}
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struct vattr *
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puffs_pn_getvap(struct puffs_node *pn)
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{
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return &pn->pn_va;
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}
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void *
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puffs_pn_getpriv(struct puffs_node *pn)
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{
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return pn->pn_data;
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}
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void
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puffs_pn_setpriv(struct puffs_node *pn, void *priv)
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{
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pn->pn_data = priv;
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}
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struct puffs_pathobj *
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puffs_pn_getpo(struct puffs_node *pn)
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{
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return &pn->pn_po;
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}
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struct puffs_usermount *
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puffs_pn_getmnt(struct puffs_node *pn)
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{
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return pn->pn_mnt;
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}
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/* convenience / shortcut */
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void *
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puffs_pn_getmntspecific(struct puffs_node *pn)
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{
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return pn->pn_mnt->pu_privdata;
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}
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/*
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* newnode parameters
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*/
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void
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puffs_newinfo_setcookie(struct puffs_newinfo *pni, puffs_cookie_t cookie)
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{
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*pni->pni_cookie = cookie;
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}
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void
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puffs_newinfo_setvtype(struct puffs_newinfo *pni, enum vtype vt)
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{
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*pni->pni_vtype = vt;
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}
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void
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puffs_newinfo_setsize(struct puffs_newinfo *pni, voff_t size)
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{
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*pni->pni_size = size;
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}
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void
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puffs_newinfo_setrdev(struct puffs_newinfo *pni, dev_t rdev)
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{
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*pni->pni_rdev = rdev;
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}
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void
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puffs_newinfo_setva(struct puffs_newinfo *pni, struct vattr *va)
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{
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(void)memcpy(pni->pni_va, va, sizeof(struct vattr));
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}
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void
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puffs_newinfo_setvattl(struct puffs_newinfo *pni, struct timespec *va_ttl)
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{
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pni->pni_va_ttl->tv_sec = va_ttl->tv_sec;
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pni->pni_va_ttl->tv_nsec = va_ttl->tv_nsec;
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}
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void
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puffs_newinfo_setcnttl(struct puffs_newinfo *pni, struct timespec *cn_ttl)
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{
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pni->pni_cn_ttl->tv_sec = cn_ttl->tv_sec;
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pni->pni_cn_ttl->tv_nsec = cn_ttl->tv_nsec;
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}
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