Merge swap_pager.c and vm_swap.c into swap_pager.c, the separation
is not natural and needlessly exposes a lot of dirty laundry. Move private interfaces between the two from swap_pager.h to swap_pager.c and staticize as much as possible. No functional change.
This commit is contained in:
Poul-Henning Kamp
parent
e805a9b9f9
commit
e9c0cc157b
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=117722
@ -1607,7 +1607,6 @@ vm/vm_contig.c standard
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vm/vm_zeroidle.c standard
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vm/vm_pageout.c standard
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vm/vm_pager.c standard
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vm/vm_swap.c standard
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vm/vm_unix.c standard
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vm/uma_core.c standard
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vm/uma_dbg.c standard
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@ -2,7 +2,7 @@
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* Copyright (c) 1998 Matthew Dillon,
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* Copyright (c) 1994 John S. Dyson
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* Copyright (c) 1990 University of Utah.
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* Copyright (c) 1991, 1993
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* Copyright (c) 1982, 1986, 1989, 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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@ -63,11 +63,16 @@
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* from: Utah $Hdr: swap_pager.c 1.4 91/04/30$
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*
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* @(#)swap_pager.c 8.9 (Berkeley) 3/21/94
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* @(#)vm_swap.c 8.5 (Berkeley) 2/17/94
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_mac.h"
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#include "opt_swap.h"
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#include "opt_vm.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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@ -75,15 +80,20 @@ __FBSDID("$FreeBSD$");
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#include <sys/proc.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/disk.h>
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#include <sys/fcntl.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <sys/mac.h>
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#include <sys/malloc.h>
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#include <sys/sysctl.h>
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#include <sys/sysproto.h>
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#include <sys/blist.h>
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#include <sys/lock.h>
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#include <sys/sx.h>
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#include <sys/vmmeter.h>
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#include "opt_swap.h"
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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@ -92,10 +102,35 @@ __FBSDID("$FreeBSD$");
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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_pageout.h>
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#include <vm/vm_param.h>
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#include <vm/swap_pager.h>
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#include <vm/vm_extern.h>
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#include <vm/uma.h>
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#ifndef NSWAPDEV
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#define NSWAPDEV 4
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#endif
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typedef int32_t swblk_t; /* swap offset */
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struct swblock {
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struct swblock *swb_hnext;
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vm_object_t swb_object;
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vm_pindex_t swb_index;
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int swb_count;
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daddr_t swb_pages[SWAP_META_PAGES];
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};
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static struct swdevt should_be_malloced[NSWAPDEV];
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static struct swdevt *swdevt = should_be_malloced;
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static int nswap; /* first block after the interleaved devs */
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static int nswdev = NSWAPDEV;
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int vm_swap_size;
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static int swdev_syscall_active = 0; /* serialize swap(on|off) */
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static int swapdev_strategy(struct vop_strategy_args *ap);
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static struct vnode *swapdev_vp;
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#define SWM_FREE 0x02 /* free, period */
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#define SWM_POP 0x04 /* pop out */
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@ -131,8 +166,8 @@ SYSCTL_INT(_vm, OID_AUTO, swap_async_max,
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static struct mtx sw_alloc_mtx; /* protect list manipulation */
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static struct pagerlst swap_pager_object_list[NOBJLISTS];
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struct pagerlst swap_pager_un_object_list;
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uma_zone_t swap_zone;
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static struct pagerlst swap_pager_un_object_list;
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static uma_zone_t swap_zone;
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/*
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* pagerops for OBJT_SWAP - "swap pager". Some ops are also global procedure
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@ -149,6 +184,7 @@ static boolean_t
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static void swap_pager_init(void);
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static void swap_pager_unswapped(vm_page_t);
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static void swap_pager_strategy(vm_object_t, struct bio *);
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static void swap_pager_swapoff(int devidx, int *sw_used);
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struct pagerops swappagerops = {
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swap_pager_init, /* early system initialization of pager */
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@ -172,9 +208,9 @@ static void waitchainbuf(struct bio *bp, int count, int done);
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* swap_*() routines are externally accessible. swp_*() routines are
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* internal.
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*/
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int dmmax, dmmax_mask;
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int nswap_lowat = 128; /* in pages, swap_pager_almost_full warn */
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int nswap_hiwat = 512; /* in pages, swap_pager_almost_full warn */
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static int dmmax, dmmax_mask;
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static int nswap_lowat = 128; /* in pages, swap_pager_almost_full warn */
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static int nswap_hiwat = 512; /* in pages, swap_pager_almost_full warn */
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SYSCTL_INT(_vm, OID_AUTO, dmmax,
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CTLFLAG_RD, &dmmax, 0, "Maximum size of a swap block");
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@ -1738,7 +1774,7 @@ swp_pager_force_pagein(struct swblock *swap, int idx)
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*
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* This routine may block.
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*/
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void
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static void
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swap_pager_swapoff(int devidx, int *sw_used)
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{
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struct swblock **pswap;
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@ -2205,3 +2241,462 @@ waitchainbuf(struct bio *bp, int limit, int done)
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splx(s);
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}
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/*
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* swapdev_strategy:
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*
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* VOP_STRATEGY() for swapdev_vp.
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* Perform swap strategy interleave device selection.
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*
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* The bp is expected to be locked and *not* B_DONE on call.
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*/
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static int
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swapdev_strategy(ap)
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struct vop_strategy_args /* {
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struct vnode *a_vp;
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struct buf *a_bp;
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} */ *ap;
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{
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int s, sz, off, seg, index;
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struct swdevt *sp;
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struct vnode *vp;
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struct buf *bp;
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KASSERT(ap->a_vp == ap->a_bp->b_vp, ("%s(%p != %p)",
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__func__, ap->a_vp, ap->a_bp->b_vp));
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bp = ap->a_bp;
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sz = howmany(bp->b_bcount, PAGE_SIZE);
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/*
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* Convert interleaved swap into per-device swap. Note that
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* the block size is left in PAGE_SIZE'd chunks (for the newswap)
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* here.
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*/
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if (nswdev > 1) {
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off = bp->b_blkno % dmmax;
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if (off + sz > dmmax) {
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bp->b_error = EINVAL;
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bp->b_ioflags |= BIO_ERROR;
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bufdone(bp);
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return 0;
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}
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seg = bp->b_blkno / dmmax;
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index = seg % nswdev;
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seg /= nswdev;
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bp->b_blkno = seg * dmmax + off;
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} else {
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index = 0;
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}
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sp = &swdevt[index];
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if (bp->b_blkno + sz > sp->sw_nblks) {
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bp->b_error = EINVAL;
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bp->b_ioflags |= BIO_ERROR;
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bufdone(bp);
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return 0;
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}
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bp->b_dev = sp->sw_device;
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if (sp->sw_vp == NULL) {
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bp->b_error = ENODEV;
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bp->b_ioflags |= BIO_ERROR;
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bufdone(bp);
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return 0;
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}
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/*
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* Convert from PAGE_SIZE'd to DEV_BSIZE'd chunks for the actual I/O
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*/
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bp->b_blkno = ctodb(bp->b_blkno);
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vhold(sp->sw_vp);
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s = splvm();
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if (bp->b_iocmd == BIO_WRITE) {
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vp = bp->b_vp;
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if (vp) {
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VI_LOCK(vp);
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vp->v_numoutput--;
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if ((vp->v_iflag & VI_BWAIT) && vp->v_numoutput <= 0) {
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vp->v_iflag &= ~VI_BWAIT;
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wakeup(&vp->v_numoutput);
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}
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VI_UNLOCK(vp);
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}
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VI_LOCK(sp->sw_vp);
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sp->sw_vp->v_numoutput++;
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VI_UNLOCK(sp->sw_vp);
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}
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bp->b_vp = sp->sw_vp;
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splx(s);
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if (bp->b_vp->v_type == VCHR)
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VOP_SPECSTRATEGY(bp->b_vp, bp);
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else
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VOP_STRATEGY(bp->b_vp, bp);
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return 0;
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}
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/*
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* Create a special vnode op vector for swapdev_vp - we only use
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* VOP_STRATEGY() and reclaim; everything else returns an error.
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*/
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vop_t **swapdev_vnodeop_p;
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static struct vnodeopv_entry_desc swapdev_vnodeop_entries[] = {
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{ &vop_default_desc, (vop_t *) vop_defaultop },
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{ &vop_reclaim_desc, (vop_t *) vop_null },
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{ &vop_strategy_desc, (vop_t *) swapdev_strategy },
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{ NULL, NULL }
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};
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static struct vnodeopv_desc swapdev_vnodeop_opv_desc =
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{ &swapdev_vnodeop_p, swapdev_vnodeop_entries };
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VNODEOP_SET(swapdev_vnodeop_opv_desc);
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/*
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* System call swapon(name) enables swapping on device name,
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* which must be in the swdevsw. Return EBUSY
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* if already swapping on this device.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct swapon_args {
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char *name;
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};
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#endif
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/*
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* MPSAFE
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*/
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/* ARGSUSED */
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int
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swapon(td, uap)
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struct thread *td;
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struct swapon_args *uap;
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{
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struct vattr attr;
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struct vnode *vp;
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struct nameidata nd;
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int error;
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mtx_lock(&Giant);
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error = suser(td);
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if (error)
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goto done2;
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while (swdev_syscall_active)
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tsleep(&swdev_syscall_active, PUSER - 1, "swpon", 0);
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swdev_syscall_active = 1;
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/*
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* Swap metadata may not fit in the KVM if we have physical
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* memory of >1GB.
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*/
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if (swap_zone == NULL) {
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error = ENOMEM;
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goto done;
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}
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->name, td);
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error = namei(&nd);
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if (error)
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goto done;
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NDFREE(&nd, NDF_ONLY_PNBUF);
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vp = nd.ni_vp;
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if (vn_isdisk(vp, &error))
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error = swaponvp(td, vp, vp->v_rdev, 0);
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else if (vp->v_type == VREG &&
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(vp->v_mount->mnt_vfc->vfc_flags & VFCF_NETWORK) != 0 &&
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(error = VOP_GETATTR(vp, &attr, td->td_ucred, td)) == 0) {
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/*
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* Allow direct swapping to NFS regular files in the same
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* way that nfs_mountroot() sets up diskless swapping.
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*/
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error = swaponvp(td, vp, NODEV, attr.va_size / DEV_BSIZE);
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}
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if (error)
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vrele(vp);
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done:
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swdev_syscall_active = 0;
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wakeup_one(&swdev_syscall_active);
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done2:
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mtx_unlock(&Giant);
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return (error);
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}
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/*
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* Swfree(index) frees the index'th portion of the swap map.
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* Each of the nswdev devices provides 1/nswdev'th of the swap
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* space, which is laid out with blocks of dmmax pages circularly
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* among the devices.
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*
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* The new swap code uses page-sized blocks. The old swap code used
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* DEV_BSIZE'd chunks.
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*/
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int
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swaponvp(td, vp, dev, nblks)
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struct thread *td;
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struct vnode *vp;
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dev_t dev;
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u_long nblks;
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{
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int index;
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struct swdevt *sp;
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swblk_t vsbase;
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long blk;
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swblk_t dvbase;
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int error;
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u_long aligned_nblks;
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off_t mediasize;
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|
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if (!swapdev_vp) {
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error = getnewvnode("none", NULL, swapdev_vnodeop_p,
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&swapdev_vp);
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if (error)
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panic("Cannot get vnode for swapdev");
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swapdev_vp->v_type = VNON; /* Untyped */
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}
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ASSERT_VOP_UNLOCKED(vp, "swaponvp");
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for (sp = swdevt, index = 0 ; index < nswdev; index++, sp++) {
|
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if (sp->sw_vp == vp)
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return EBUSY;
|
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if (!sp->sw_vp)
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goto found;
|
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|
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}
|
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return EINVAL;
|
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found:
|
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(void) vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
|
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#ifdef MAC
|
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error = mac_check_system_swapon(td->td_ucred, vp);
|
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if (error == 0)
|
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#endif
|
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error = VOP_OPEN(vp, FREAD | FWRITE, td->td_ucred, td);
|
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(void) VOP_UNLOCK(vp, 0, td);
|
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if (error)
|
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return (error);
|
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|
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if (nblks == 0) {
|
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error = VOP_IOCTL(vp, DIOCGMEDIASIZE, (caddr_t)&mediasize,
|
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FREAD, td->td_ucred, td);
|
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if (error == 0)
|
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nblks = mediasize / DEV_BSIZE;
|
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}
|
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/*
|
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* XXX: We should also check that the sectorsize makes sense
|
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* XXX: it should be a power of two, no larger than the page size.
|
||||
*/
|
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if (nblks == 0) {
|
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(void) VOP_CLOSE(vp, FREAD | FWRITE, td->td_ucred, td);
|
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return (ENXIO);
|
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}
|
||||
|
||||
/*
|
||||
* If we go beyond this, we get overflows in the radix
|
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* tree bitmap code.
|
||||
*/
|
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if (nblks > 0x40000000 / BLIST_META_RADIX / nswdev) {
|
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printf("exceeded maximum of %d blocks per swap unit\n",
|
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0x40000000 / BLIST_META_RADIX / nswdev);
|
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(void) VOP_CLOSE(vp, FREAD | FWRITE, td->td_ucred, td);
|
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return (ENXIO);
|
||||
}
|
||||
/*
|
||||
* nblks is in DEV_BSIZE'd chunks, convert to PAGE_SIZE'd chunks.
|
||||
* First chop nblks off to page-align it, then convert.
|
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*
|
||||
* sw->sw_nblks is in page-sized chunks now too.
|
||||
*/
|
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nblks &= ~(ctodb(1) - 1);
|
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nblks = dbtoc(nblks);
|
||||
|
||||
sp->sw_vp = vp;
|
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sp->sw_dev = dev2udev(dev);
|
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sp->sw_device = dev;
|
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sp->sw_flags = SW_FREED;
|
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sp->sw_nblks = nblks;
|
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sp->sw_used = 0;
|
||||
|
||||
/*
|
||||
* nblks, nswap, and dmmax are PAGE_SIZE'd parameters now, not
|
||||
* DEV_BSIZE'd. aligned_nblks is used to calculate the
|
||||
* size of the swap bitmap, taking into account the stripe size.
|
||||
*/
|
||||
aligned_nblks = (nblks + (dmmax -1)) & ~(u_long)(dmmax -1);
|
||||
|
||||
if (aligned_nblks * nswdev > nswap)
|
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nswap = aligned_nblks * nswdev;
|
||||
|
||||
if (swapblist == NULL)
|
||||
swapblist = blist_create(nswap);
|
||||
else
|
||||
blist_resize(&swapblist, nswap, 0);
|
||||
|
||||
for (dvbase = dmmax; dvbase < nblks; dvbase += dmmax) {
|
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blk = min(nblks - dvbase, dmmax);
|
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vsbase = index * dmmax + dvbase * nswdev;
|
||||
blist_free(swapblist, vsbase, blk);
|
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vm_swap_size += blk;
|
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}
|
||||
|
||||
swap_pager_full = 0;
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
/*
|
||||
* SYSCALL: swapoff(devname)
|
||||
*
|
||||
* Disable swapping on the given device.
|
||||
*/
|
||||
#ifndef _SYS_SYSPROTO_H_
|
||||
struct swapoff_args {
|
||||
char *name;
|
||||
};
|
||||
#endif
|
||||
|
||||
/*
|
||||
* MPSAFE
|
||||
*/
|
||||
/* ARGSUSED */
|
||||
int
|
||||
swapoff(td, uap)
|
||||
struct thread *td;
|
||||
struct swapoff_args *uap;
|
||||
{
|
||||
struct vnode *vp;
|
||||
struct nameidata nd;
|
||||
struct swdevt *sp;
|
||||
swblk_t dvbase, vsbase;
|
||||
u_long nblks, aligned_nblks, blk;
|
||||
int error, index;
|
||||
|
||||
mtx_lock(&Giant);
|
||||
|
||||
error = suser(td);
|
||||
if (error)
|
||||
goto done2;
|
||||
|
||||
while (swdev_syscall_active)
|
||||
tsleep(&swdev_syscall_active, PUSER - 1, "swpoff", 0);
|
||||
swdev_syscall_active = 1;
|
||||
|
||||
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->name, td);
|
||||
error = namei(&nd);
|
||||
if (error)
|
||||
goto done;
|
||||
NDFREE(&nd, NDF_ONLY_PNBUF);
|
||||
vp = nd.ni_vp;
|
||||
|
||||
for (sp = swdevt, index = 0 ; index < nswdev; index++, sp++) {
|
||||
if (sp->sw_vp == vp)
|
||||
goto found;
|
||||
}
|
||||
error = EINVAL;
|
||||
goto done;
|
||||
found:
|
||||
#ifdef MAC
|
||||
(void) vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
|
||||
error = mac_check_system_swapoff(td->td_ucred, vp);
|
||||
(void) VOP_UNLOCK(vp, 0, td);
|
||||
if (error != 0)
|
||||
goto done;
|
||||
#endif
|
||||
|
||||
nblks = sp->sw_nblks;
|
||||
|
||||
/*
|
||||
* We can turn off this swap device safely only if the
|
||||
* available virtual memory in the system will fit the amount
|
||||
* of data we will have to page back in, plus an epsilon so
|
||||
* the system doesn't become critically low on swap space.
|
||||
*/
|
||||
if (cnt.v_free_count + cnt.v_cache_count + vm_swap_size <
|
||||
nblks + nswap_lowat) {
|
||||
error = ENOMEM;
|
||||
goto done;
|
||||
}
|
||||
|
||||
/*
|
||||
* Prevent further allocations on this device.
|
||||
*/
|
||||
sp->sw_flags |= SW_CLOSING;
|
||||
for (dvbase = dmmax; dvbase < nblks; dvbase += dmmax) {
|
||||
blk = min(nblks - dvbase, dmmax);
|
||||
vsbase = index * dmmax + dvbase * nswdev;
|
||||
vm_swap_size -= blist_fill(swapblist, vsbase, blk);
|
||||
}
|
||||
|
||||
/*
|
||||
* Page in the contents of the device and close it.
|
||||
*/
|
||||
#ifndef NO_SWAPPING
|
||||
vm_proc_swapin_all(index);
|
||||
#endif /* !NO_SWAPPING */
|
||||
swap_pager_swapoff(index, &sp->sw_used);
|
||||
|
||||
VOP_CLOSE(vp, FREAD | FWRITE, td->td_ucred, td);
|
||||
vrele(vp);
|
||||
sp->sw_vp = NULL;
|
||||
|
||||
/*
|
||||
* Resize the bitmap based on the new largest swap device,
|
||||
* or free the bitmap if there are no more devices.
|
||||
*/
|
||||
for (sp = swdevt, nblks = 0; sp < swdevt + nswdev; sp++) {
|
||||
if (sp->sw_vp == NULL)
|
||||
continue;
|
||||
nblks = max(nblks, sp->sw_nblks);
|
||||
}
|
||||
|
||||
aligned_nblks = (nblks + (dmmax -1)) & ~(u_long)(dmmax -1);
|
||||
nswap = aligned_nblks * nswdev;
|
||||
|
||||
if (nswap == 0) {
|
||||
blist_destroy(swapblist);
|
||||
swapblist = NULL;
|
||||
vrele(swapdev_vp);
|
||||
swapdev_vp = NULL;
|
||||
} else
|
||||
blist_resize(&swapblist, nswap, 0);
|
||||
|
||||
done:
|
||||
swdev_syscall_active = 0;
|
||||
wakeup_one(&swdev_syscall_active);
|
||||
done2:
|
||||
mtx_unlock(&Giant);
|
||||
return (error);
|
||||
}
|
||||
|
||||
static int
|
||||
sysctl_vm_swap_info(SYSCTL_HANDLER_ARGS)
|
||||
{
|
||||
int *name = (int *)arg1;
|
||||
int error, i, n;
|
||||
struct xswdev xs;
|
||||
struct swdevt *sp;
|
||||
|
||||
if (arg2 != 1) /* name length */
|
||||
return (EINVAL);
|
||||
|
||||
for (sp = swdevt, i = 0, n = 0 ; i < nswdev; i++, sp++) {
|
||||
if (sp->sw_vp) {
|
||||
if (n == *name) {
|
||||
xs.xsw_version = XSWDEV_VERSION;
|
||||
xs.xsw_dev = sp->sw_dev;
|
||||
xs.xsw_flags = sp->sw_flags;
|
||||
xs.xsw_nblks = sp->sw_nblks;
|
||||
xs.xsw_used = sp->sw_used;
|
||||
|
||||
error = SYSCTL_OUT(req, &xs, sizeof(xs));
|
||||
return (error);
|
||||
}
|
||||
n++;
|
||||
}
|
||||
|
||||
}
|
||||
return (ENOENT);
|
||||
}
|
||||
|
||||
SYSCTL_INT(_vm, OID_AUTO, nswapdev, CTLFLAG_RD, &nswdev, 0,
|
||||
"Number of swap devices");
|
||||
SYSCTL_NODE(_vm, OID_AUTO, swap_info, CTLFLAG_RD, sysctl_vm_swap_info,
|
||||
"Swap statistics by device");
|
||||
|
||||
@ -92,42 +92,16 @@ struct swdevt {
|
||||
#define SWAP_META_PAGES (SWB_NPAGES * 2)
|
||||
#define SWAP_META_MASK (SWAP_META_PAGES - 1)
|
||||
|
||||
struct swblock {
|
||||
struct swblock *swb_hnext;
|
||||
vm_object_t swb_object;
|
||||
vm_pindex_t swb_index;
|
||||
int swb_count;
|
||||
daddr_t swb_pages[SWAP_META_PAGES];
|
||||
};
|
||||
|
||||
extern struct pagerlst swap_pager_un_object_list;
|
||||
extern int swap_pager_full;
|
||||
extern struct blist *swapblist;
|
||||
extern struct uma_zone *swap_zone;
|
||||
extern int nswap_lowat, nswap_hiwat;
|
||||
extern int dmmax, dmmax_mask;
|
||||
extern struct vnode *swapdev_vp;
|
||||
extern struct swdevt *swdevt;
|
||||
extern int nswdev;
|
||||
/*
|
||||
* vm_swap_size is in page-sized chunks now. It was DEV_BSIZE'd chunks
|
||||
* in the old system.
|
||||
*/
|
||||
extern int vm_swap_size; /* number of free swap blocks, in pages */
|
||||
extern int vm_swap_size;
|
||||
|
||||
void swap_pager_putpages(vm_object_t, vm_page_t *, int, boolean_t, int *);
|
||||
void swap_pager_swapoff(int devidx, int *sw_used);
|
||||
|
||||
void swap_pager_copy(vm_object_t, vm_object_t, vm_pindex_t, int);
|
||||
void swap_pager_freespace(vm_object_t, vm_pindex_t, vm_size_t);
|
||||
void swap_pager_swap_init(void);
|
||||
int swap_pager_isswapped(vm_object_t, int);
|
||||
int swap_pager_reserve(vm_object_t, vm_pindex_t, vm_size_t);
|
||||
|
||||
/*
|
||||
* newswap functions
|
||||
*/
|
||||
|
||||
|
||||
#endif /* _KERNEL */
|
||||
#endif /* _VM_SWAP_PAGER_H_ */
|
||||
|
||||
546
sys/vm/vm_swap.c
546
sys/vm/vm_swap.c
@ -1,546 +0,0 @@
|
||||
/*
|
||||
* Copyright (c) 1982, 1986, 1989, 1993
|
||||
* The Regents of the University of California. All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. All advertising materials mentioning features or use of this software
|
||||
* must display the following acknowledgement:
|
||||
* This product includes software developed by the University of
|
||||
* California, Berkeley and its contributors.
|
||||
* 4. Neither the name of the University nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* @(#)vm_swap.c 8.5 (Berkeley) 2/17/94
|
||||
*/
|
||||
|
||||
#include <sys/cdefs.h>
|
||||
__FBSDID("$FreeBSD$");
|
||||
|
||||
#include "opt_mac.h"
|
||||
#include "opt_swap.h"
|
||||
#include "opt_vm.h"
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/systm.h>
|
||||
#include <sys/sysproto.h>
|
||||
#include <sys/bio.h>
|
||||
#include <sys/buf.h>
|
||||
#include <sys/proc.h>
|
||||
#include <sys/namei.h>
|
||||
#include <sys/vnode.h>
|
||||
#include <sys/fcntl.h>
|
||||
#include <sys/blist.h>
|
||||
#include <sys/kernel.h>
|
||||
#include <sys/lock.h>
|
||||
#include <sys/conf.h>
|
||||
#include <sys/disk.h>
|
||||
#include <sys/stat.h>
|
||||
#include <sys/sysctl.h>
|
||||
#include <sys/mac.h>
|
||||
#include <sys/mount.h>
|
||||
#include <vm/vm.h>
|
||||
#include <vm/vm_extern.h>
|
||||
#include <vm/vm_param.h>
|
||||
#include <vm/vm_pageout.h>
|
||||
#include <vm/swap_pager.h>
|
||||
#include <vm/uma.h>
|
||||
|
||||
/*
|
||||
* Indirect driver for multi-controller paging.
|
||||
*/
|
||||
|
||||
typedef int32_t swblk_t; /* swap offset */
|
||||
|
||||
#ifndef NSWAPDEV
|
||||
#define NSWAPDEV 4
|
||||
#endif
|
||||
static struct swdevt should_be_malloced[NSWAPDEV];
|
||||
struct swdevt *swdevt = should_be_malloced;
|
||||
static int nswap; /* first block after the interleaved devs */
|
||||
int nswdev = NSWAPDEV;
|
||||
int vm_swap_size;
|
||||
static int swdev_syscall_active = 0; /* serialize swap(on|off) */
|
||||
|
||||
|
||||
static int swapdev_strategy(struct vop_strategy_args *ap);
|
||||
struct vnode *swapdev_vp;
|
||||
|
||||
/*
|
||||
* swapdev_strategy:
|
||||
*
|
||||
* VOP_STRATEGY() for swapdev_vp.
|
||||
* Perform swap strategy interleave device selection.
|
||||
*
|
||||
* The bp is expected to be locked and *not* B_DONE on call.
|
||||
*/
|
||||
static int
|
||||
swapdev_strategy(ap)
|
||||
struct vop_strategy_args /* {
|
||||
struct vnode *a_vp;
|
||||
struct buf *a_bp;
|
||||
} */ *ap;
|
||||
{
|
||||
int s, sz, off, seg, index;
|
||||
struct swdevt *sp;
|
||||
struct vnode *vp;
|
||||
struct buf *bp;
|
||||
|
||||
KASSERT(ap->a_vp == ap->a_bp->b_vp, ("%s(%p != %p)",
|
||||
__func__, ap->a_vp, ap->a_bp->b_vp));
|
||||
bp = ap->a_bp;
|
||||
sz = howmany(bp->b_bcount, PAGE_SIZE);
|
||||
|
||||
/*
|
||||
* Convert interleaved swap into per-device swap. Note that
|
||||
* the block size is left in PAGE_SIZE'd chunks (for the newswap)
|
||||
* here.
|
||||
*/
|
||||
if (nswdev > 1) {
|
||||
off = bp->b_blkno % dmmax;
|
||||
if (off + sz > dmmax) {
|
||||
bp->b_error = EINVAL;
|
||||
bp->b_ioflags |= BIO_ERROR;
|
||||
bufdone(bp);
|
||||
return 0;
|
||||
}
|
||||
seg = bp->b_blkno / dmmax;
|
||||
index = seg % nswdev;
|
||||
seg /= nswdev;
|
||||
bp->b_blkno = seg * dmmax + off;
|
||||
} else {
|
||||
index = 0;
|
||||
}
|
||||
sp = &swdevt[index];
|
||||
if (bp->b_blkno + sz > sp->sw_nblks) {
|
||||
bp->b_error = EINVAL;
|
||||
bp->b_ioflags |= BIO_ERROR;
|
||||
bufdone(bp);
|
||||
return 0;
|
||||
}
|
||||
bp->b_dev = sp->sw_device;
|
||||
if (sp->sw_vp == NULL) {
|
||||
bp->b_error = ENODEV;
|
||||
bp->b_ioflags |= BIO_ERROR;
|
||||
bufdone(bp);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Convert from PAGE_SIZE'd to DEV_BSIZE'd chunks for the actual I/O
|
||||
*/
|
||||
bp->b_blkno = ctodb(bp->b_blkno);
|
||||
|
||||
vhold(sp->sw_vp);
|
||||
s = splvm();
|
||||
if (bp->b_iocmd == BIO_WRITE) {
|
||||
vp = bp->b_vp;
|
||||
if (vp) {
|
||||
VI_LOCK(vp);
|
||||
vp->v_numoutput--;
|
||||
if ((vp->v_iflag & VI_BWAIT) && vp->v_numoutput <= 0) {
|
||||
vp->v_iflag &= ~VI_BWAIT;
|
||||
wakeup(&vp->v_numoutput);
|
||||
}
|
||||
VI_UNLOCK(vp);
|
||||
}
|
||||
VI_LOCK(sp->sw_vp);
|
||||
sp->sw_vp->v_numoutput++;
|
||||
VI_UNLOCK(sp->sw_vp);
|
||||
}
|
||||
bp->b_vp = sp->sw_vp;
|
||||
splx(s);
|
||||
if (bp->b_vp->v_type == VCHR)
|
||||
VOP_SPECSTRATEGY(bp->b_vp, bp);
|
||||
else
|
||||
VOP_STRATEGY(bp->b_vp, bp);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Create a special vnode op vector for swapdev_vp - we only use
|
||||
* VOP_STRATEGY() and reclaim; everything else returns an error.
|
||||
*/
|
||||
vop_t **swapdev_vnodeop_p;
|
||||
static struct vnodeopv_entry_desc swapdev_vnodeop_entries[] = {
|
||||
{ &vop_default_desc, (vop_t *) vop_defaultop },
|
||||
{ &vop_reclaim_desc, (vop_t *) vop_null },
|
||||
{ &vop_strategy_desc, (vop_t *) swapdev_strategy },
|
||||
{ NULL, NULL }
|
||||
};
|
||||
static struct vnodeopv_desc swapdev_vnodeop_opv_desc =
|
||||
{ &swapdev_vnodeop_p, swapdev_vnodeop_entries };
|
||||
|
||||
VNODEOP_SET(swapdev_vnodeop_opv_desc);
|
||||
|
||||
/*
|
||||
* System call swapon(name) enables swapping on device name,
|
||||
* which must be in the swdevsw. Return EBUSY
|
||||
* if already swapping on this device.
|
||||
*/
|
||||
#ifndef _SYS_SYSPROTO_H_
|
||||
struct swapon_args {
|
||||
char *name;
|
||||
};
|
||||
#endif
|
||||
|
||||
/*
|
||||
* MPSAFE
|
||||
*/
|
||||
/* ARGSUSED */
|
||||
int
|
||||
swapon(td, uap)
|
||||
struct thread *td;
|
||||
struct swapon_args *uap;
|
||||
{
|
||||
struct vattr attr;
|
||||
struct vnode *vp;
|
||||
struct nameidata nd;
|
||||
int error;
|
||||
|
||||
mtx_lock(&Giant);
|
||||
error = suser(td);
|
||||
if (error)
|
||||
goto done2;
|
||||
|
||||
while (swdev_syscall_active)
|
||||
tsleep(&swdev_syscall_active, PUSER - 1, "swpon", 0);
|
||||
swdev_syscall_active = 1;
|
||||
|
||||
/*
|
||||
* Swap metadata may not fit in the KVM if we have physical
|
||||
* memory of >1GB.
|
||||
*/
|
||||
if (swap_zone == NULL) {
|
||||
error = ENOMEM;
|
||||
goto done;
|
||||
}
|
||||
|
||||
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->name, td);
|
||||
error = namei(&nd);
|
||||
if (error)
|
||||
goto done;
|
||||
|
||||
NDFREE(&nd, NDF_ONLY_PNBUF);
|
||||
vp = nd.ni_vp;
|
||||
|
||||
if (vn_isdisk(vp, &error))
|
||||
error = swaponvp(td, vp, vp->v_rdev, 0);
|
||||
else if (vp->v_type == VREG &&
|
||||
(vp->v_mount->mnt_vfc->vfc_flags & VFCF_NETWORK) != 0 &&
|
||||
(error = VOP_GETATTR(vp, &attr, td->td_ucred, td)) == 0) {
|
||||
/*
|
||||
* Allow direct swapping to NFS regular files in the same
|
||||
* way that nfs_mountroot() sets up diskless swapping.
|
||||
*/
|
||||
error = swaponvp(td, vp, NODEV, attr.va_size / DEV_BSIZE);
|
||||
}
|
||||
|
||||
if (error)
|
||||
vrele(vp);
|
||||
done:
|
||||
swdev_syscall_active = 0;
|
||||
wakeup_one(&swdev_syscall_active);
|
||||
done2:
|
||||
mtx_unlock(&Giant);
|
||||
return (error);
|
||||
}
|
||||
|
||||
/*
|
||||
* Swfree(index) frees the index'th portion of the swap map.
|
||||
* Each of the nswdev devices provides 1/nswdev'th of the swap
|
||||
* space, which is laid out with blocks of dmmax pages circularly
|
||||
* among the devices.
|
||||
*
|
||||
* The new swap code uses page-sized blocks. The old swap code used
|
||||
* DEV_BSIZE'd chunks.
|
||||
*/
|
||||
int
|
||||
swaponvp(td, vp, dev, nblks)
|
||||
struct thread *td;
|
||||
struct vnode *vp;
|
||||
dev_t dev;
|
||||
u_long nblks;
|
||||
{
|
||||
int index;
|
||||
struct swdevt *sp;
|
||||
swblk_t vsbase;
|
||||
long blk;
|
||||
swblk_t dvbase;
|
||||
int error;
|
||||
u_long aligned_nblks;
|
||||
off_t mediasize;
|
||||
|
||||
if (!swapdev_vp) {
|
||||
error = getnewvnode("none", NULL, swapdev_vnodeop_p,
|
||||
&swapdev_vp);
|
||||
if (error)
|
||||
panic("Cannot get vnode for swapdev");
|
||||
swapdev_vp->v_type = VNON; /* Untyped */
|
||||
}
|
||||
|
||||
ASSERT_VOP_UNLOCKED(vp, "swaponvp");
|
||||
for (sp = swdevt, index = 0 ; index < nswdev; index++, sp++) {
|
||||
if (sp->sw_vp == vp)
|
||||
return EBUSY;
|
||||
if (!sp->sw_vp)
|
||||
goto found;
|
||||
|
||||
}
|
||||
return EINVAL;
|
||||
found:
|
||||
(void) vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
|
||||
#ifdef MAC
|
||||
error = mac_check_system_swapon(td->td_ucred, vp);
|
||||
if (error == 0)
|
||||
#endif
|
||||
error = VOP_OPEN(vp, FREAD | FWRITE, td->td_ucred, td);
|
||||
(void) VOP_UNLOCK(vp, 0, td);
|
||||
if (error)
|
||||
return (error);
|
||||
|
||||
if (nblks == 0) {
|
||||
error = VOP_IOCTL(vp, DIOCGMEDIASIZE, (caddr_t)&mediasize,
|
||||
FREAD, td->td_ucred, td);
|
||||
if (error == 0)
|
||||
nblks = mediasize / DEV_BSIZE;
|
||||
}
|
||||
/*
|
||||
* XXX: We should also check that the sectorsize makes sense
|
||||
* XXX: it should be a power of two, no larger than the page size.
|
||||
*/
|
||||
if (nblks == 0) {
|
||||
(void) VOP_CLOSE(vp, FREAD | FWRITE, td->td_ucred, td);
|
||||
return (ENXIO);
|
||||
}
|
||||
|
||||
/*
|
||||
* If we go beyond this, we get overflows in the radix
|
||||
* tree bitmap code.
|
||||
*/
|
||||
if (nblks > 0x40000000 / BLIST_META_RADIX / nswdev) {
|
||||
printf("exceeded maximum of %d blocks per swap unit\n",
|
||||
0x40000000 / BLIST_META_RADIX / nswdev);
|
||||
(void) VOP_CLOSE(vp, FREAD | FWRITE, td->td_ucred, td);
|
||||
return (ENXIO);
|
||||
}
|
||||
/*
|
||||
* nblks is in DEV_BSIZE'd chunks, convert to PAGE_SIZE'd chunks.
|
||||
* First chop nblks off to page-align it, then convert.
|
||||
*
|
||||
* sw->sw_nblks is in page-sized chunks now too.
|
||||
*/
|
||||
nblks &= ~(ctodb(1) - 1);
|
||||
nblks = dbtoc(nblks);
|
||||
|
||||
sp->sw_vp = vp;
|
||||
sp->sw_dev = dev2udev(dev);
|
||||
sp->sw_device = dev;
|
||||
sp->sw_flags = SW_FREED;
|
||||
sp->sw_nblks = nblks;
|
||||
sp->sw_used = 0;
|
||||
|
||||
/*
|
||||
* nblks, nswap, and dmmax are PAGE_SIZE'd parameters now, not
|
||||
* DEV_BSIZE'd. aligned_nblks is used to calculate the
|
||||
* size of the swap bitmap, taking into account the stripe size.
|
||||
*/
|
||||
aligned_nblks = (nblks + (dmmax -1)) & ~(u_long)(dmmax -1);
|
||||
|
||||
if (aligned_nblks * nswdev > nswap)
|
||||
nswap = aligned_nblks * nswdev;
|
||||
|
||||
if (swapblist == NULL)
|
||||
swapblist = blist_create(nswap);
|
||||
else
|
||||
blist_resize(&swapblist, nswap, 0);
|
||||
|
||||
for (dvbase = dmmax; dvbase < nblks; dvbase += dmmax) {
|
||||
blk = min(nblks - dvbase, dmmax);
|
||||
vsbase = index * dmmax + dvbase * nswdev;
|
||||
blist_free(swapblist, vsbase, blk);
|
||||
vm_swap_size += blk;
|
||||
}
|
||||
|
||||
swap_pager_full = 0;
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
/*
|
||||
* SYSCALL: swapoff(devname)
|
||||
*
|
||||
* Disable swapping on the given device.
|
||||
*/
|
||||
#ifndef _SYS_SYSPROTO_H_
|
||||
struct swapoff_args {
|
||||
char *name;
|
||||
};
|
||||
#endif
|
||||
|
||||
/*
|
||||
* MPSAFE
|
||||
*/
|
||||
/* ARGSUSED */
|
||||
int
|
||||
swapoff(td, uap)
|
||||
struct thread *td;
|
||||
struct swapoff_args *uap;
|
||||
{
|
||||
struct vnode *vp;
|
||||
struct nameidata nd;
|
||||
struct swdevt *sp;
|
||||
swblk_t dvbase, vsbase;
|
||||
u_long nblks, aligned_nblks, blk;
|
||||
int error, index;
|
||||
|
||||
mtx_lock(&Giant);
|
||||
|
||||
error = suser(td);
|
||||
if (error)
|
||||
goto done2;
|
||||
|
||||
while (swdev_syscall_active)
|
||||
tsleep(&swdev_syscall_active, PUSER - 1, "swpoff", 0);
|
||||
swdev_syscall_active = 1;
|
||||
|
||||
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->name, td);
|
||||
error = namei(&nd);
|
||||
if (error)
|
||||
goto done;
|
||||
NDFREE(&nd, NDF_ONLY_PNBUF);
|
||||
vp = nd.ni_vp;
|
||||
|
||||
for (sp = swdevt, index = 0 ; index < nswdev; index++, sp++) {
|
||||
if (sp->sw_vp == vp)
|
||||
goto found;
|
||||
}
|
||||
error = EINVAL;
|
||||
goto done;
|
||||
found:
|
||||
#ifdef MAC
|
||||
(void) vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
|
||||
error = mac_check_system_swapoff(td->td_ucred, vp);
|
||||
(void) VOP_UNLOCK(vp, 0, td);
|
||||
if (error != 0)
|
||||
goto done;
|
||||
#endif
|
||||
|
||||
nblks = sp->sw_nblks;
|
||||
|
||||
/*
|
||||
* We can turn off this swap device safely only if the
|
||||
* available virtual memory in the system will fit the amount
|
||||
* of data we will have to page back in, plus an epsilon so
|
||||
* the system doesn't become critically low on swap space.
|
||||
*/
|
||||
if (cnt.v_free_count + cnt.v_cache_count + vm_swap_size <
|
||||
nblks + nswap_lowat) {
|
||||
error = ENOMEM;
|
||||
goto done;
|
||||
}
|
||||
|
||||
/*
|
||||
* Prevent further allocations on this device.
|
||||
*/
|
||||
sp->sw_flags |= SW_CLOSING;
|
||||
for (dvbase = dmmax; dvbase < nblks; dvbase += dmmax) {
|
||||
blk = min(nblks - dvbase, dmmax);
|
||||
vsbase = index * dmmax + dvbase * nswdev;
|
||||
vm_swap_size -= blist_fill(swapblist, vsbase, blk);
|
||||
}
|
||||
|
||||
/*
|
||||
* Page in the contents of the device and close it.
|
||||
*/
|
||||
#ifndef NO_SWAPPING
|
||||
vm_proc_swapin_all(index);
|
||||
#endif /* !NO_SWAPPING */
|
||||
swap_pager_swapoff(index, &sp->sw_used);
|
||||
|
||||
VOP_CLOSE(vp, FREAD | FWRITE, td->td_ucred, td);
|
||||
vrele(vp);
|
||||
sp->sw_vp = NULL;
|
||||
|
||||
/*
|
||||
* Resize the bitmap based on the new largest swap device,
|
||||
* or free the bitmap if there are no more devices.
|
||||
*/
|
||||
for (sp = swdevt, nblks = 0; sp < swdevt + nswdev; sp++) {
|
||||
if (sp->sw_vp == NULL)
|
||||
continue;
|
||||
nblks = max(nblks, sp->sw_nblks);
|
||||
}
|
||||
|
||||
aligned_nblks = (nblks + (dmmax -1)) & ~(u_long)(dmmax -1);
|
||||
nswap = aligned_nblks * nswdev;
|
||||
|
||||
if (nswap == 0) {
|
||||
blist_destroy(swapblist);
|
||||
swapblist = NULL;
|
||||
vrele(swapdev_vp);
|
||||
swapdev_vp = NULL;
|
||||
} else
|
||||
blist_resize(&swapblist, nswap, 0);
|
||||
|
||||
done:
|
||||
swdev_syscall_active = 0;
|
||||
wakeup_one(&swdev_syscall_active);
|
||||
done2:
|
||||
mtx_unlock(&Giant);
|
||||
return (error);
|
||||
}
|
||||
|
||||
static int
|
||||
sysctl_vm_swap_info(SYSCTL_HANDLER_ARGS)
|
||||
{
|
||||
int *name = (int *)arg1;
|
||||
int error, i, n;
|
||||
struct xswdev xs;
|
||||
struct swdevt *sp;
|
||||
|
||||
if (arg2 != 1) /* name length */
|
||||
return (EINVAL);
|
||||
|
||||
for (sp = swdevt, i = 0, n = 0 ; i < nswdev; i++, sp++) {
|
||||
if (sp->sw_vp) {
|
||||
if (n == *name) {
|
||||
xs.xsw_version = XSWDEV_VERSION;
|
||||
xs.xsw_dev = sp->sw_dev;
|
||||
xs.xsw_flags = sp->sw_flags;
|
||||
xs.xsw_nblks = sp->sw_nblks;
|
||||
xs.xsw_used = sp->sw_used;
|
||||
|
||||
error = SYSCTL_OUT(req, &xs, sizeof(xs));
|
||||
return (error);
|
||||
}
|
||||
n++;
|
||||
}
|
||||
|
||||
}
|
||||
return (ENOENT);
|
||||
}
|
||||
|
||||
SYSCTL_INT(_vm, OID_AUTO, nswapdev, CTLFLAG_RD, &nswdev, 0,
|
||||
"Number of swap devices");
|
||||
SYSCTL_NODE(_vm, OID_AUTO, swap_info, CTLFLAG_RD, sysctl_vm_swap_info,
|
||||
"Swap statistics by device");
|
||||
Loading…
Reference in New Issue
Block a user