There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
462 lines
11 KiB
C
462 lines
11 KiB
C
/* $NetBSD: mpool.c,v 1.19 2009/04/22 18:44:06 christos Exp $ */
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/*-
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* Copyright (c) 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 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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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: mpool.c,v 1.19 2009/04/22 18:44:06 christos Exp $");
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#include "namespace.h"
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#include <sys/queue.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <db.h>
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#define __MPOOLINTERFACE_PRIVATE
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#include <mpool.h>
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#ifdef __weak_alias
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__weak_alias(mpool_close,_mpool_close)
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__weak_alias(mpool_filter,_mpool_filter)
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__weak_alias(mpool_get,_mpool_get)
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__weak_alias(mpool_new,_mpool_new)
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__weak_alias(mpool_open,_mpool_open)
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__weak_alias(mpool_put,_mpool_put)
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__weak_alias(mpool_sync,_mpool_sync)
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#endif
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static BKT *mpool_bkt(MPOOL *);
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static BKT *mpool_look(MPOOL *, pgno_t);
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static int mpool_write(MPOOL *, BKT *);
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/*
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* mpool_open --
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* Initialize a memory pool.
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*/
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/*ARGSUSED*/
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MPOOL *
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mpool_open(void *key, int fd, pgno_t pagesize, pgno_t maxcache)
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{
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struct stat sb;
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MPOOL *mp;
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int entry;
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/*
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* Get information about the file.
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*
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* XXX
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* We don't currently handle pipes, although we should.
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*/
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if (fstat(fd, &sb))
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return (NULL);
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if (!S_ISREG(sb.st_mode)) {
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errno = ESPIPE;
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return (NULL);
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}
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/* Allocate and initialize the MPOOL cookie. */
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if ((mp = (MPOOL *)calloc(1, sizeof(MPOOL))) == NULL)
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return (NULL);
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CIRCLEQ_INIT(&mp->lqh);
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for (entry = 0; entry < HASHSIZE; ++entry)
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CIRCLEQ_INIT(&mp->hqh[entry]);
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mp->maxcache = maxcache;
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mp->npages = (pgno_t)(sb.st_size / pagesize);
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mp->pagesize = pagesize;
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mp->fd = fd;
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return (mp);
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}
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/*
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* mpool_filter --
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* Initialize input/output filters.
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*/
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void
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mpool_filter(MPOOL *mp, void (*pgin)(void *, pgno_t, void *),
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void (*pgout)(void *, pgno_t, void *), void *pgcookie)
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{
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mp->pgin = pgin;
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mp->pgout = pgout;
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mp->pgcookie = pgcookie;
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}
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/*
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* mpool_new --
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* Get a new page of memory.
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*/
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void *
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mpool_new( MPOOL *mp, pgno_t *pgnoaddr)
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{
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struct _hqh *head;
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BKT *bp;
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if (mp->npages == MAX_PAGE_NUMBER) {
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(void)fprintf(stderr, "mpool_new: page allocation overflow.\n");
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abort();
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}
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#ifdef STATISTICS
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++mp->pagenew;
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#endif
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/*
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* Get a BKT from the cache. Assign a new page number, attach
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* it to the head of the hash chain, the tail of the lru chain,
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* and return.
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*/
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if ((bp = mpool_bkt(mp)) == NULL)
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return (NULL);
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*pgnoaddr = bp->pgno = mp->npages++;
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bp->flags = MPOOL_PINNED;
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head = &mp->hqh[HASHKEY(bp->pgno)];
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CIRCLEQ_INSERT_HEAD(head, bp, hq);
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CIRCLEQ_INSERT_TAIL(&mp->lqh, bp, q);
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return (bp->page);
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}
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/*
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* mpool_get
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* Get a page.
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*/
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/*ARGSUSED*/
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void *
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mpool_get(MPOOL *mp, pgno_t pgno, u_int flags)
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{
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struct _hqh *head;
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BKT *bp;
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off_t off;
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ssize_t nr;
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/* Check for attempt to retrieve a non-existent page. */
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if (pgno >= mp->npages) {
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errno = EINVAL;
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return (NULL);
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}
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#ifdef STATISTICS
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++mp->pageget;
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#endif
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/* Check for a page that is cached. */
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if ((bp = mpool_look(mp, pgno)) != NULL) {
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#ifdef DEBUG
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if (bp->flags & MPOOL_PINNED) {
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(void)fprintf(stderr,
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"mpool_get: page %d already pinned\n", bp->pgno);
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abort();
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}
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#endif
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/*
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* Move the page to the head of the hash chain and the tail
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* of the lru chain.
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*/
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head = &mp->hqh[HASHKEY(bp->pgno)];
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CIRCLEQ_REMOVE(head, bp, hq);
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CIRCLEQ_INSERT_HEAD(head, bp, hq);
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CIRCLEQ_REMOVE(&mp->lqh, bp, q);
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CIRCLEQ_INSERT_TAIL(&mp->lqh, bp, q);
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/* Return a pinned page. */
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bp->flags |= MPOOL_PINNED;
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return (bp->page);
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}
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/* Get a page from the cache. */
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if ((bp = mpool_bkt(mp)) == NULL)
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return (NULL);
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/* Read in the contents. */
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#ifdef STATISTICS
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++mp->pageread;
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#endif
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off = mp->pagesize * pgno;
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if ((nr = pread(mp->fd, bp->page, (size_t)mp->pagesize, off)) != (int)mp->pagesize) {
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if (nr >= 0)
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errno = EFTYPE;
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return (NULL);
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}
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/* Set the page number, pin the page. */
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bp->pgno = pgno;
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bp->flags = MPOOL_PINNED;
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/*
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* Add the page to the head of the hash chain and the tail
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* of the lru chain.
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*/
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head = &mp->hqh[HASHKEY(bp->pgno)];
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CIRCLEQ_INSERT_HEAD(head, bp, hq);
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CIRCLEQ_INSERT_TAIL(&mp->lqh, bp, q);
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/* Run through the user's filter. */
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if (mp->pgin != NULL)
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(mp->pgin)(mp->pgcookie, bp->pgno, bp->page);
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return (bp->page);
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}
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/*
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* mpool_put
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* Return a page.
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*/
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/*ARGSUSED*/
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int
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mpool_put(MPOOL *mp, void *page, u_int flags)
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{
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BKT *bp;
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#ifdef STATISTICS
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++mp->pageput;
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#endif
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bp = (BKT *)(void *)((char *)page - sizeof(BKT));
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#ifdef DEBUG
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if (!(bp->flags & MPOOL_PINNED)) {
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(void)fprintf(stderr,
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"mpool_put: page %d not pinned\n", bp->pgno);
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abort();
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}
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#endif
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bp->flags &= ~MPOOL_PINNED;
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bp->flags |= flags & MPOOL_DIRTY;
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return (RET_SUCCESS);
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}
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/*
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* mpool_close
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* Close the buffer pool.
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*/
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int
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mpool_close(MPOOL *mp)
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{
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BKT *bp;
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/* Free up any space allocated to the lru pages. */
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while ((bp = mp->lqh.cqh_first) != (void *)&mp->lqh) {
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CIRCLEQ_REMOVE(&mp->lqh, mp->lqh.cqh_first, q);
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free(bp);
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}
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/* Free the MPOOL cookie. */
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free(mp);
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return (RET_SUCCESS);
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}
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/*
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* mpool_sync
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* Sync the pool to disk.
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*/
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int
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mpool_sync(MPOOL *mp)
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{
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BKT *bp;
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/* Walk the lru chain, flushing any dirty pages to disk. */
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for (bp = mp->lqh.cqh_first;
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bp != (void *)&mp->lqh; bp = bp->q.cqe_next)
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if (bp->flags & MPOOL_DIRTY &&
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mpool_write(mp, bp) == RET_ERROR)
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return (RET_ERROR);
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/* Sync the file descriptor. */
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return (fsync(mp->fd) ? RET_ERROR : RET_SUCCESS);
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}
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/*
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* mpool_bkt
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* Get a page from the cache (or create one).
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*/
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static BKT *
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mpool_bkt(MPOOL *mp)
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{
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struct _hqh *head;
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BKT *bp;
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/* If under the max cached, always create a new page. */
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if (mp->curcache < mp->maxcache)
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goto new;
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/*
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* If the cache is max'd out, walk the lru list for a buffer we
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* can flush. If we find one, write it (if necessary) and take it
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* off any lists. If we don't find anything we grow the cache anyway.
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* The cache never shrinks.
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*/
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for (bp = mp->lqh.cqh_first;
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bp != (void *)&mp->lqh; bp = bp->q.cqe_next)
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if (!(bp->flags & MPOOL_PINNED)) {
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/* Flush if dirty. */
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if (bp->flags & MPOOL_DIRTY &&
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mpool_write(mp, bp) == RET_ERROR)
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return (NULL);
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#ifdef STATISTICS
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++mp->pageflush;
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#endif
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/* Remove from the hash and lru queues. */
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head = &mp->hqh[HASHKEY(bp->pgno)];
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CIRCLEQ_REMOVE(head, bp, hq);
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CIRCLEQ_REMOVE(&mp->lqh, bp, q);
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#ifdef DEBUG
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{
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void *spage = bp->page;
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(void)memset(bp, 0xff,
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(size_t)(sizeof(BKT) + mp->pagesize));
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bp->page = spage;
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}
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#endif
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return (bp);
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}
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new: if ((bp = calloc(1, (size_t)(sizeof(BKT) + mp->pagesize))) == NULL)
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return (NULL);
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#ifdef STATISTICS
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++mp->pagealloc;
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#endif
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#if defined(DEBUG) || defined(PURIFY)
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(void)memset(bp, 0xff, (size_t)(sizeof(BKT) + mp->pagesize));
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#endif
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bp->page = (char *)(void *)bp + sizeof(BKT);
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++mp->curcache;
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return (bp);
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}
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/*
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* mpool_write
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* Write a page to disk.
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*/
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static int
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mpool_write(MPOOL *mp, BKT *bp)
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{
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off_t off;
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#ifdef STATISTICS
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++mp->pagewrite;
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#endif
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/* Run through the user's filter. */
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if (mp->pgout)
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(mp->pgout)(mp->pgcookie, bp->pgno, bp->page);
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off = mp->pagesize * bp->pgno;
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if (pwrite(mp->fd, bp->page, (size_t)mp->pagesize, off) != (int)mp->pagesize)
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return (RET_ERROR);
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/*
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* Re-run through the input filter since this page may soon be
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* accessed via the cache, and whatever the user's output filter
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* did may screw things up if we don't let the input filter
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* restore the in-core copy.
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*/
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if (mp->pgin)
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(mp->pgin)(mp->pgcookie, bp->pgno, bp->page);
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bp->flags &= ~MPOOL_DIRTY;
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return (RET_SUCCESS);
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}
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/*
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* mpool_look
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* Lookup a page in the cache.
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*/
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static BKT *
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mpool_look(MPOOL *mp, pgno_t pgno)
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{
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struct _hqh *head;
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BKT *bp;
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head = &mp->hqh[HASHKEY(pgno)];
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for (bp = head->cqh_first; bp != (void *)head; bp = bp->hq.cqe_next)
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if (bp->pgno == pgno) {
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#ifdef STATISTICS
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++mp->cachehit;
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#endif
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return (bp);
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}
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#ifdef STATISTICS
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++mp->cachemiss;
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#endif
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return (NULL);
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}
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#ifdef STATISTICS
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/*
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* mpool_stat
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* Print out cache statistics.
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*/
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void
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mpool_stat(mp)
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MPOOL *mp;
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{
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BKT *bp;
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int cnt;
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const char *sep;
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(void)fprintf(stderr, "%lu pages in the file\n", (u_long)mp->npages);
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(void)fprintf(stderr,
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"page size %lu, cacheing %lu pages of %lu page max cache\n",
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(u_long)mp->pagesize, (u_long)mp->curcache, (u_long)mp->maxcache);
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(void)fprintf(stderr, "%lu page puts, %lu page gets, %lu page new\n",
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mp->pageput, mp->pageget, mp->pagenew);
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(void)fprintf(stderr, "%lu page allocs, %lu page flushes\n",
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mp->pagealloc, mp->pageflush);
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if (mp->cachehit + mp->cachemiss)
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(void)fprintf(stderr,
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"%.0f%% cache hit rate (%lu hits, %lu misses)\n",
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((double)mp->cachehit / (mp->cachehit + mp->cachemiss))
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* 100, mp->cachehit, mp->cachemiss);
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(void)fprintf(stderr, "%lu page reads, %lu page writes\n",
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mp->pageread, mp->pagewrite);
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sep = "";
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cnt = 0;
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for (bp = mp->lqh.cqh_first;
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bp != (void *)&mp->lqh; bp = bp->q.cqe_next) {
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(void)fprintf(stderr, "%s%d", sep, bp->pgno);
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if (bp->flags & MPOOL_DIRTY)
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(void)fprintf(stderr, "d");
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if (bp->flags & MPOOL_PINNED)
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(void)fprintf(stderr, "P");
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if (++cnt == 10) {
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sep = "\n";
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cnt = 0;
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} else
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sep = ", ";
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}
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(void)fprintf(stderr, "\n");
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}
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#endif
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