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![Ryan Libby](/assets/img/avatar_default.png)
The LK_NOWAIT was added to suppress a witness warning, but LK_NOWITNESS is more what we mean. This makes pbuf_ctor() more consistent with buf_alloc(), although, unlike buf_alloc(), for pbuf there should not be any danger of a wild locker relying on the type stability of the buf to attempt a lock. That is, this is essentially cosmetic. Relevant history: -531f8cfea0
Use dedicated lock name for pbufs -5875b94c74
buf_alloc(): lock the buffer with LK_NOWAIT -c9e023541a
pbuf_ctor(): lock the buffer with LK_NOWAIT -1fb00c8f10
buf_alloc(): Stop using LK_NOWAIT, use LK_NOWITNESS Reviewed by: rew, kib Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D45360
627 lines
16 KiB
C
627 lines
16 KiB
C
/*-
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* SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU)
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*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS 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
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* OR 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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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Authors: Avadis Tevanian, Jr., Michael Wayne Young
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*
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* Paging space routine stubs. Emulates a matchmaker-like interface
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* for builtin pagers.
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*/
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#include <sys/cdefs.h>
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#include "opt_param.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/vnode.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/ucred.h>
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#include <sys/malloc.h>
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#include <sys/rwlock.h>
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#include <sys/user.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pager.h>
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#include <vm/vm_extern.h>
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#include <vm/uma.h>
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uma_zone_t pbuf_zone;
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static int pbuf_init(void *, int, int);
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static int pbuf_ctor(void *, int, void *, int);
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static void pbuf_dtor(void *, int, void *);
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static int dead_pager_getpages(vm_object_t, vm_page_t *, int, int *, int *);
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static vm_object_t dead_pager_alloc(void *, vm_ooffset_t, vm_prot_t,
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vm_ooffset_t, struct ucred *);
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static void dead_pager_putpages(vm_object_t, vm_page_t *, int, int, int *);
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static boolean_t dead_pager_haspage(vm_object_t, vm_pindex_t, int *, int *);
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static void dead_pager_dealloc(vm_object_t);
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static void dead_pager_getvp(vm_object_t, struct vnode **, bool *);
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static int
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dead_pager_getpages(vm_object_t obj, vm_page_t *ma, int count, int *rbehind,
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int *rahead)
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{
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return (VM_PAGER_FAIL);
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}
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static vm_object_t
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dead_pager_alloc(void *handle, vm_ooffset_t size, vm_prot_t prot,
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vm_ooffset_t off, struct ucred *cred)
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{
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return (NULL);
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}
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static void
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dead_pager_putpages(vm_object_t object, vm_page_t *m, int count,
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int flags, int *rtvals)
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{
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int i;
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for (i = 0; i < count; i++)
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rtvals[i] = VM_PAGER_AGAIN;
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}
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static boolean_t
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dead_pager_haspage(vm_object_t object, vm_pindex_t pindex, int *prev, int *next)
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{
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if (prev != NULL)
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*prev = 0;
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if (next != NULL)
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*next = 0;
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return (FALSE);
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}
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static void
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dead_pager_dealloc(vm_object_t object)
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{
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}
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static void
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dead_pager_getvp(vm_object_t object, struct vnode **vpp, bool *vp_heldp)
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{
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/*
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* For OBJT_DEAD objects, v_writecount was handled in
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* vnode_pager_dealloc().
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*/
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}
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static const struct pagerops deadpagerops = {
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.pgo_kvme_type = KVME_TYPE_DEAD,
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.pgo_alloc = dead_pager_alloc,
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.pgo_dealloc = dead_pager_dealloc,
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.pgo_getpages = dead_pager_getpages,
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.pgo_putpages = dead_pager_putpages,
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.pgo_haspage = dead_pager_haspage,
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.pgo_getvp = dead_pager_getvp,
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};
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const struct pagerops *pagertab[16] __read_mostly = {
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[OBJT_SWAP] = &swappagerops,
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[OBJT_VNODE] = &vnodepagerops,
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[OBJT_DEVICE] = &devicepagerops,
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[OBJT_PHYS] = &physpagerops,
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[OBJT_DEAD] = &deadpagerops,
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[OBJT_SG] = &sgpagerops,
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[OBJT_MGTDEVICE] = &mgtdevicepagerops,
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};
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static struct mtx pagertab_lock;
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void
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vm_pager_init(void)
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{
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const struct pagerops **pgops;
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int i;
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mtx_init(&pagertab_lock, "dynpag", NULL, MTX_DEF);
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/*
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* Initialize known pagers
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*/
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for (i = 0; i < OBJT_FIRST_DYN; i++) {
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pgops = &pagertab[i];
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if (*pgops != NULL && (*pgops)->pgo_init != NULL)
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(*(*pgops)->pgo_init)();
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}
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}
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static int nswbuf_max;
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void
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vm_pager_bufferinit(void)
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{
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/* Main zone for paging bufs. */
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pbuf_zone = uma_zcreate("pbuf",
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sizeof(struct buf) + PBUF_PAGES * sizeof(vm_page_t),
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pbuf_ctor, pbuf_dtor, pbuf_init, NULL, UMA_ALIGN_CACHE,
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UMA_ZONE_NOFREE);
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/* Few systems may still use this zone directly, so it needs a limit. */
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nswbuf_max += uma_zone_set_max(pbuf_zone, NSWBUF_MIN);
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}
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uma_zone_t
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pbuf_zsecond_create(const char *name, int max)
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{
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uma_zone_t zone;
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zone = uma_zsecond_create(name, pbuf_ctor, pbuf_dtor, NULL, NULL,
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pbuf_zone);
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#ifdef KMSAN
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/*
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* Shrink the size of the pbuf pools if KMSAN is enabled, otherwise the
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* shadows of the large KVA allocations eat up too much memory.
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*/
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max /= 3;
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#endif
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/*
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* uma_prealloc() rounds up to items per slab. If we would prealloc
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* immediately on every pbuf_zsecond_create(), we may accumulate too
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* much of difference between hard limit and prealloced items, which
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* means wasted memory.
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*/
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if (nswbuf_max > 0)
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nswbuf_max += uma_zone_set_max(zone, max);
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else
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uma_prealloc(pbuf_zone, uma_zone_set_max(zone, max));
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return (zone);
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}
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static void
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pbuf_prealloc(void *arg __unused)
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{
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uma_prealloc(pbuf_zone, nswbuf_max);
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nswbuf_max = -1;
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}
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SYSINIT(pbuf, SI_SUB_KTHREAD_BUF, SI_ORDER_ANY, pbuf_prealloc, NULL);
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/*
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* Allocate an instance of a pager of the given type.
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* Size, protection and offset parameters are passed in for pagers that
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* need to perform page-level validation (e.g. the device pager).
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*/
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vm_object_t
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vm_pager_allocate(objtype_t type, void *handle, vm_ooffset_t size,
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vm_prot_t prot, vm_ooffset_t off, struct ucred *cred)
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{
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vm_object_t object;
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MPASS(type < nitems(pagertab));
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object = (*pagertab[type]->pgo_alloc)(handle, size, prot, off, cred);
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if (object != NULL)
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object->type = type;
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return (object);
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}
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/*
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* The object must be locked.
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*/
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void
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vm_pager_deallocate(vm_object_t object)
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{
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VM_OBJECT_ASSERT_WLOCKED(object);
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MPASS(object->type < nitems(pagertab));
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(*pagertab[object->type]->pgo_dealloc) (object);
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}
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static void
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vm_pager_assert_in(vm_object_t object, vm_page_t *m, int count)
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{
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#ifdef INVARIANTS
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/*
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* All pages must be consecutive, busied, not mapped, not fully valid,
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* not dirty and belong to the proper object. Some pages may be the
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* bogus page, but the first and last pages must be a real ones.
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*/
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VM_OBJECT_ASSERT_UNLOCKED(object);
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VM_OBJECT_ASSERT_PAGING(object);
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KASSERT(count > 0, ("%s: 0 count", __func__));
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for (int i = 0 ; i < count; i++) {
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if (m[i] == bogus_page) {
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KASSERT(i != 0 && i != count - 1,
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("%s: page %d is the bogus page", __func__, i));
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continue;
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}
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vm_page_assert_xbusied(m[i]);
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KASSERT(!pmap_page_is_mapped(m[i]),
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("%s: page %p is mapped", __func__, m[i]));
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KASSERT(m[i]->valid != VM_PAGE_BITS_ALL,
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("%s: request for a valid page %p", __func__, m[i]));
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KASSERT(m[i]->dirty == 0,
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("%s: page %p is dirty", __func__, m[i]));
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KASSERT(m[i]->object == object,
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("%s: wrong object %p/%p", __func__, object, m[i]->object));
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KASSERT(m[i]->pindex == m[0]->pindex + i,
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("%s: page %p isn't consecutive", __func__, m[i]));
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}
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#endif
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}
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/*
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* Page in the pages for the object using its associated pager.
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* The requested page must be fully valid on successful return.
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*/
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int
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vm_pager_get_pages(vm_object_t object, vm_page_t *m, int count, int *rbehind,
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int *rahead)
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{
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#ifdef INVARIANTS
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vm_pindex_t pindex = m[0]->pindex;
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#endif
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int r;
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MPASS(object->type < nitems(pagertab));
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vm_pager_assert_in(object, m, count);
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r = (*pagertab[object->type]->pgo_getpages)(object, m, count, rbehind,
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rahead);
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if (r != VM_PAGER_OK)
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return (r);
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for (int i = 0; i < count; i++) {
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/*
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* If pager has replaced a page, assert that it had
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* updated the array.
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*/
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#ifdef INVARIANTS
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KASSERT(m[i] == vm_page_relookup(object, pindex++),
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("%s: mismatch page %p pindex %ju", __func__,
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m[i], (uintmax_t )pindex - 1));
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#endif
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/*
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* Zero out partially filled data.
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*/
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if (m[i]->valid != VM_PAGE_BITS_ALL)
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vm_page_zero_invalid(m[i], TRUE);
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}
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return (VM_PAGER_OK);
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}
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int
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vm_pager_get_pages_async(vm_object_t object, vm_page_t *m, int count,
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int *rbehind, int *rahead, pgo_getpages_iodone_t iodone, void *arg)
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{
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MPASS(object->type < nitems(pagertab));
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vm_pager_assert_in(object, m, count);
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return ((*pagertab[object->type]->pgo_getpages_async)(object, m,
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count, rbehind, rahead, iodone, arg));
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}
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/*
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* vm_pager_put_pages() - inline, see vm/vm_pager.h
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* vm_pager_has_page() - inline, see vm/vm_pager.h
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*/
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/*
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* Search the specified pager object list for an object with the
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* specified handle. If an object with the specified handle is found,
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* increase its reference count and return it. Otherwise, return NULL.
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*
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* The pager object list must be locked.
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*/
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vm_object_t
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vm_pager_object_lookup(struct pagerlst *pg_list, void *handle)
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{
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vm_object_t object;
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TAILQ_FOREACH(object, pg_list, pager_object_list) {
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if (object->handle == handle) {
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VM_OBJECT_WLOCK(object);
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if ((object->flags & OBJ_DEAD) == 0) {
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vm_object_reference_locked(object);
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VM_OBJECT_WUNLOCK(object);
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break;
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}
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VM_OBJECT_WUNLOCK(object);
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}
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}
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return (object);
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}
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int
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vm_pager_alloc_dyn_type(struct pagerops *ops, int base_type)
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{
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int res;
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mtx_lock(&pagertab_lock);
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MPASS(base_type == -1 ||
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(base_type >= OBJT_SWAP && base_type < nitems(pagertab)));
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for (res = OBJT_FIRST_DYN; res < nitems(pagertab); res++) {
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if (pagertab[res] == NULL)
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break;
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}
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if (res == nitems(pagertab)) {
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mtx_unlock(&pagertab_lock);
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return (-1);
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}
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if (base_type != -1) {
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MPASS(pagertab[base_type] != NULL);
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#define FIX(n) \
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if (ops->pgo_##n == NULL) \
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ops->pgo_##n = pagertab[base_type]->pgo_##n
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FIX(init);
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FIX(alloc);
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FIX(dealloc);
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FIX(getpages);
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FIX(getpages_async);
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FIX(putpages);
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FIX(haspage);
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FIX(populate);
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FIX(pageunswapped);
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FIX(update_writecount);
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FIX(release_writecount);
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FIX(set_writeable_dirty);
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FIX(mightbedirty);
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FIX(getvp);
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FIX(freespace);
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FIX(page_inserted);
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FIX(page_removed);
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FIX(can_alloc_page);
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#undef FIX
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}
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pagertab[res] = ops; /* XXXKIB should be rel, but acq is too much */
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mtx_unlock(&pagertab_lock);
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return (res);
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}
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void
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vm_pager_free_dyn_type(objtype_t type)
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{
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MPASS(type >= OBJT_FIRST_DYN && type < nitems(pagertab));
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mtx_lock(&pagertab_lock);
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MPASS(pagertab[type] != NULL);
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pagertab[type] = NULL;
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mtx_unlock(&pagertab_lock);
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}
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static int
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pbuf_ctor(void *mem, int size, void *arg, int flags)
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{
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struct buf *bp = mem;
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bp->b_vp = NULL;
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bp->b_bufobj = NULL;
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/* copied from initpbuf() */
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bp->b_rcred = NOCRED;
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bp->b_wcred = NOCRED;
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bp->b_qindex = 0; /* On no queue (QUEUE_NONE) */
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bp->b_data = bp->b_kvabase;
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bp->b_xflags = 0;
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bp->b_flags = B_MAXPHYS;
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bp->b_ioflags = 0;
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bp->b_iodone = NULL;
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bp->b_error = 0;
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BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
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return (0);
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}
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static void
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pbuf_dtor(void *mem, int size, void *arg)
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{
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struct buf *bp = mem;
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if (bp->b_rcred != NOCRED) {
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crfree(bp->b_rcred);
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bp->b_rcred = NOCRED;
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}
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if (bp->b_wcred != NOCRED) {
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crfree(bp->b_wcred);
|
|
bp->b_wcred = NOCRED;
|
|
}
|
|
|
|
BUF_UNLOCK(bp);
|
|
}
|
|
|
|
static const char pbuf_wmesg[] = "pbufwait";
|
|
|
|
static int
|
|
pbuf_init(void *mem, int size, int flags)
|
|
{
|
|
struct buf *bp = mem;
|
|
|
|
TSENTER();
|
|
|
|
bp->b_kvabase = (void *)kva_alloc(ptoa(PBUF_PAGES));
|
|
if (bp->b_kvabase == NULL)
|
|
return (ENOMEM);
|
|
bp->b_kvasize = ptoa(PBUF_PAGES);
|
|
BUF_LOCKINIT(bp, pbuf_wmesg);
|
|
LIST_INIT(&bp->b_dep);
|
|
bp->b_rcred = bp->b_wcred = NOCRED;
|
|
bp->b_xflags = 0;
|
|
|
|
TSEXIT();
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Associate a p-buffer with a vnode.
|
|
*
|
|
* Also sets B_PAGING flag to indicate that vnode is not fully associated
|
|
* with the buffer. i.e. the bp has not been linked into the vnode or
|
|
* ref-counted.
|
|
*/
|
|
void
|
|
pbgetvp(struct vnode *vp, struct buf *bp)
|
|
{
|
|
|
|
KASSERT(bp->b_vp == NULL, ("pbgetvp: not free"));
|
|
KASSERT(bp->b_bufobj == NULL, ("pbgetvp: not free (bufobj)"));
|
|
|
|
bp->b_vp = vp;
|
|
bp->b_flags |= B_PAGING;
|
|
bp->b_bufobj = &vp->v_bufobj;
|
|
}
|
|
|
|
/*
|
|
* Associate a p-buffer with a vnode.
|
|
*
|
|
* Also sets B_PAGING flag to indicate that vnode is not fully associated
|
|
* with the buffer. i.e. the bp has not been linked into the vnode or
|
|
* ref-counted.
|
|
*/
|
|
void
|
|
pbgetbo(struct bufobj *bo, struct buf *bp)
|
|
{
|
|
|
|
KASSERT(bp->b_vp == NULL, ("pbgetbo: not free (vnode)"));
|
|
KASSERT(bp->b_bufobj == NULL, ("pbgetbo: not free (bufobj)"));
|
|
|
|
bp->b_flags |= B_PAGING;
|
|
bp->b_bufobj = bo;
|
|
}
|
|
|
|
/*
|
|
* Disassociate a p-buffer from a vnode.
|
|
*/
|
|
void
|
|
pbrelvp(struct buf *bp)
|
|
{
|
|
|
|
KASSERT(bp->b_vp != NULL, ("pbrelvp: NULL"));
|
|
KASSERT(bp->b_bufobj != NULL, ("pbrelvp: NULL bufobj"));
|
|
KASSERT((bp->b_xflags & (BX_VNDIRTY | BX_VNCLEAN)) == 0,
|
|
("pbrelvp: pager buf on vnode list."));
|
|
|
|
bp->b_vp = NULL;
|
|
bp->b_bufobj = NULL;
|
|
bp->b_flags &= ~B_PAGING;
|
|
}
|
|
|
|
/*
|
|
* Disassociate a p-buffer from a bufobj.
|
|
*/
|
|
void
|
|
pbrelbo(struct buf *bp)
|
|
{
|
|
|
|
KASSERT(bp->b_vp == NULL, ("pbrelbo: vnode"));
|
|
KASSERT(bp->b_bufobj != NULL, ("pbrelbo: NULL bufobj"));
|
|
KASSERT((bp->b_xflags & (BX_VNDIRTY | BX_VNCLEAN)) == 0,
|
|
("pbrelbo: pager buf on vnode list."));
|
|
|
|
bp->b_bufobj = NULL;
|
|
bp->b_flags &= ~B_PAGING;
|
|
}
|
|
|
|
void
|
|
vm_object_set_writeable_dirty(vm_object_t object)
|
|
{
|
|
pgo_set_writeable_dirty_t *method;
|
|
|
|
MPASS(object->type < nitems(pagertab));
|
|
|
|
method = pagertab[object->type]->pgo_set_writeable_dirty;
|
|
if (method != NULL)
|
|
method(object);
|
|
}
|
|
|
|
bool
|
|
vm_object_mightbedirty(vm_object_t object)
|
|
{
|
|
pgo_mightbedirty_t *method;
|
|
|
|
MPASS(object->type < nitems(pagertab));
|
|
|
|
method = pagertab[object->type]->pgo_mightbedirty;
|
|
if (method == NULL)
|
|
return (false);
|
|
return (method(object));
|
|
}
|
|
|
|
/*
|
|
* Return the kvme type of the given object.
|
|
* If vpp is not NULL, set it to the object's vm_object_vnode() or NULL.
|
|
*/
|
|
int
|
|
vm_object_kvme_type(vm_object_t object, struct vnode **vpp)
|
|
{
|
|
VM_OBJECT_ASSERT_LOCKED(object);
|
|
MPASS(object->type < nitems(pagertab));
|
|
|
|
if (vpp != NULL)
|
|
*vpp = vm_object_vnode(object);
|
|
return (pagertab[object->type]->pgo_kvme_type);
|
|
}
|