686aa9287c
This interface is used solely by md(4) when the MD_RESERVE flag is specified, as in `mdconfig -a -t swap -s 1G -o reserve`. It pre-allocates swap blocks for the entire object. The number of blocks to be reserved is specified as a vm_size_t, but swp_pager_getswapspace() can allocate at most INT_MAX blocks. vm_size_t also seems like the incorrect type to use here it refers only to the size of the VM object, not the size of a mapping. So: - change the type of "size" in swap_pager_reserve() to vm_pindex_t, and - clamp the requested number of blocks for a single swp_pager_getswapspace() call to INT_MAX. Reported by: syzkaller Reviewed by: dougm, alc, kib MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D31875
89 lines
3.1 KiB
C
89 lines
3.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1990 University of Utah.
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* Copyright (c) 1991 The Regents of the University of California.
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* 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 Systems Programming Group of the University of Utah Computer
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* Science Department.
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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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* from: @(#)swap_pager.h 7.1 (Berkeley) 12/5/90
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* $FreeBSD$
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*/
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#ifndef _VM_SWAP_PAGER_H_
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#define _VM_SWAP_PAGER_H_
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#include <sys/_types.h>
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struct buf;
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struct swdevt;
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typedef void sw_strategy_t(struct buf *, struct swdevt *);
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typedef void sw_close_t(struct thread *, struct swdevt *);
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/*
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* Swap device table
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*/
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struct swdevt {
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int sw_flags;
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int sw_nblks;
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int sw_used;
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dev_t sw_dev;
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struct vnode *sw_vp;
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void *sw_id;
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__daddr_t sw_first;
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__daddr_t sw_end;
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struct blist *sw_blist;
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TAILQ_ENTRY(swdevt) sw_list;
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sw_strategy_t *sw_strategy;
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sw_close_t *sw_close;
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};
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#define SW_UNMAPPED 0x01
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#define SW_CLOSING 0x04
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#ifdef _KERNEL
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extern int swap_pager_avail;
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struct xswdev;
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int swap_dev_info(int name, struct xswdev *xs, char *devname, size_t len);
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void swap_pager_copy(vm_object_t, vm_object_t, vm_pindex_t, int);
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vm_pindex_t swap_pager_find_least(vm_object_t object, vm_pindex_t pindex);
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void swap_pager_swap_init(void);
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int swap_pager_nswapdev(void);
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int swap_pager_reserve(vm_object_t, vm_pindex_t, vm_pindex_t);
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void swap_pager_status(int *total, int *used);
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u_long swap_pager_swapped_pages(vm_object_t object);
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void swapoff_all(void);
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bool swap_pager_init_object(vm_object_t object, void *handle,
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struct ucred *cred, vm_ooffset_t size, vm_ooffset_t offset);
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#endif /* _KERNEL */
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#endif /* _VM_SWAP_PAGER_H_ */
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