e07f0b9362
copyin() or copyout(). uvm_useracc() tells us whether the mapping permissions allow access to the desired part of an address space, and many callers assume that this is the same as knowing whether an attempt to access that part of the address space will succeed. however, access to user space can fail for reasons other than insufficient permission, most notably that paging in any non-resident data can fail due to i/o errors. most of the callers of uvm_useracc() make the above incorrect assumption. the rest are all misguided optimizations, which optimize for the case where an operation will fail. we'd rather optimize for operations succeeding, in which case we should just attempt the access and handle failures due to insufficient permissions the same way we handle i/o errors. since there appear to be no good uses of uvm_useracc(), we'll just remove it.
230 lines
6.9 KiB
C
230 lines
6.9 KiB
C
/* $NetBSD: irix_swap.c,v 1.11 2003/11/13 03:09:29 chs Exp $ */
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/*-
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* Copyright (c) 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Emmanuel Dreyfus.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: irix_swap.c,v 1.11 2003/11/13 03:09:29 chs Exp $");
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#include <sys/types.h>
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#include <sys/signal.h>
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/swap.h>
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#include <sys/vnode.h>
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#include <sys/namei.h>
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#include <sys/sa.h>
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#include <sys/syscallargs.h>
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#include <uvm/uvm_page.h>
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#include <uvm/uvm_swap.h>
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#include <compat/common/compat_util.h>
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#include <compat/irix/irix_types.h>
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#include <compat/irix/irix_signal.h>
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#include <compat/irix/irix_swap.h>
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#include <compat/irix/irix_syscall.h>
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#include <compat/irix/irix_syscallargs.h>
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extern struct lock swap_syscall_lock;
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int
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irix_sys_swapctl(l, v, retval)
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struct lwp *l;
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void *v;
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register_t *retval;
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{
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struct irix_sys_swapctl_args /* {
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syscallarg(int) cmd;
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syscallarg(void *) arg;
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} */ *uap = v;
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struct sys_swapctl_args cup;
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int error = 0;
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#ifdef DEBUG_IRIX
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printf("irix_sys_swapctl(): cmd = %d, arg = %p\n", SCARG(uap, cmd),
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SCARG(uap, arg));
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#endif
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switch (SCARG(uap, cmd)) {
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case IRIX_SC_ADD: /* Add a swap resource */
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case IRIX_SC_SGIADD: /* Add a swap resource */
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case IRIX_SC_REMOVE: {/* Remove a swap resource */
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struct irix_xswapres isr;
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size_t len = (SCARG(uap, cmd) == IRIX_SC_SGIADD) ?
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sizeof(struct irix_xswapres) : sizeof(struct irix_swapres);
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if ((error = copyin(SCARG(uap, arg), &isr, len)) != 0)
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return error;
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#ifdef DEBUG_IRIX
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printf("irix_sys_swapctl(): sr_start=%d, sr_length=%d",
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isr.sr_start, isr.sr_length);
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if (SCARG(uap, cmd) == IRIX_SC_SGIADD)
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printf(", sr_maxlength=%d, sr_vlength=%d",
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isr.sr_maxlength, isr.sr_vlength);
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printf("\n");
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#endif
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if (isr.sr_start != 0) {
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printf("Warning: irix_sys_swapctl(): ");
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printf("unsupported non null sr_start\n");
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return EINVAL;
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}
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SCARG(&cup, cmd) =
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(SCARG(uap, cmd) == IRIX_SC_REMOVE) ? SWAP_OFF : SWAP_ON;
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SCARG(&cup, arg) = isr.sr_name;
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SCARG(&cup, misc) =
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(SCARG(uap, cmd) == IRIX_SC_SGIADD) ? isr.sr_pri : 0;
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return sys_swapctl(l, &cup, retval);
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break;
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}
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case IRIX_SC_GETNSWP: /* Get number of swap items */
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SCARG(&cup, cmd) = SWAP_NSWAP;
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SCARG(&cup, arg) = NULL;
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SCARG(&cup, misc) = 0;
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return sys_swapctl(l, &cup, retval);
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break;
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case IRIX_SC_LIST: { /* Get swap list */
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struct irix_swaptable ist;
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struct swapent *bse;
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struct irix_swapent *ise, *uise;
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int len, ilen, pathlen;
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int i;
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size_t blksz = dbtob(1); /* One swap block size in bytes */
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int scale = (PAGE_SIZE / blksz);
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if ((error = copyin(SCARG(uap, arg), &ist, sizeof(ist))) != 0)
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return error;
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uise = (struct irix_swapent *)((caddr_t)SCARG(uap, arg) +
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sizeof(ist.swt_n));
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len = sizeof(struct swapent) * ist.swt_n;
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bse = (struct swapent *)malloc(len, M_TEMP, M_WAITOK);
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ilen = sizeof(struct irix_swapent) * ist.swt_n;
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ise = (struct irix_swapent *)malloc(ilen, M_TEMP, M_WAITOK);
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if ((error = copyin(uise, ise, ilen)) != 0)
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return error;
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lockmgr(&swap_syscall_lock, LK_EXCLUSIVE, NULL);
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uvm_swap_stats(SWAP_STATS, bse, ist.swt_n, retval);
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lockmgr(&swap_syscall_lock, LK_RELEASE, NULL);
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for (i = 0; i < ist.swt_n; i++) {
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pathlen = MIN(strlen(bse[i].se_path), IRIX_PATH_MAX);
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if (ise[i].ste_path != NULL &&
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((error = copyout(&(bse[i].se_path),
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ise[i].ste_path, pathlen)) != 0))
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goto bad;
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ise[i].ste_start = 0;
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ise[i].ste_length = bse[i].se_nblks * blksz;
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ise[i].ste_pages = bse[i].se_nblks / scale;
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ise[i].ste_free = (bse[i].se_nblks - bse[i].se_inuse) /
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scale;
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ise[i].ste_flags = 0;
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if (bse[i].se_flags & SWF_FAKE)
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ise[i].ste_flags |= IRIX_ST_NOTREADY;
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ise[i].ste_vpages = bse[i].se_inuse / scale;
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ise[i].ste_maxpages = bse[i].se_nblks / scale;
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ise[i].ste_lswap = 1; /* XXX */
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ise[i].ste_pri = bse[i].se_priority;
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}
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error = copyout(ise, uise, ilen);
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bad:
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free(bse, M_TEMP);
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free(ise, M_TEMP);
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return error;
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break;
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}
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case IRIX_SC_GETFREESWAP:
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case IRIX_SC_GETSWAPVIRT: {
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int entries;
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struct swapent *sep;
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int i, dontcare, sum = 0;
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SCARG(&cup, cmd) = SWAP_NSWAP;
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SCARG(&cup, arg) = NULL;
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SCARG(&cup, misc) = 0;
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if ((error = sys_swapctl(l, &cup,
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(register_t *)(void *)&entries)) != 0)
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return error;
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sep = (struct swapent *)malloc(
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sizeof(struct swapent) * entries, M_TEMP, M_WAITOK);
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lockmgr(&swap_syscall_lock, LK_EXCLUSIVE, NULL);
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uvm_swap_stats(SWAP_STATS, sep, entries,
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(register_t *)(void *)&dontcare);
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lockmgr(&swap_syscall_lock, LK_RELEASE, NULL);
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if (SCARG(uap, cmd) == IRIX_SC_GETFREESWAP)
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for (i = 0; i < entries; i++)
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sum += (sep[i].se_nblks - sep[i].se_inuse);
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if (SCARG(uap, cmd) == IRIX_SC_GETSWAPVIRT)
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for (i = 0; i < entries; i++)
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sum += sep[i].se_nblks;
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/* dbtob(1) is the size in byte of one swap block */
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sum = sum * IRIX_SWAP_BLKSZ / dbtob(1);
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if ((error = copyout(&sum, SCARG(uap, arg), sizeof(sum))) != 0)
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return error;
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break;
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}
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default:
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printf("irix_sys_swapctl(): unsupported command %d\n",
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SCARG(uap, cmd));
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break;
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}
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return 0;
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}
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