222 lines
6.4 KiB
C
222 lines
6.4 KiB
C
/* $NetBSD: buf.c,v 1.10 2003/01/24 21:55:32 fvdl Exp $ */
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/*
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* Copyright (c) 2001 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Luke Mewburn for Wasabi Systems, Inc.
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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 for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* 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 WASABI SYSTEMS, INC
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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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#if defined(__RCSID) && !defined(__lint)
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__RCSID("$NetBSD: buf.c,v 1.10 2003/01/24 21:55:32 fvdl Exp $");
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#endif /* !__lint */
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#include <sys/param.h>
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#include <sys/time.h>
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#include <assert.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 <unistd.h>
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#include "makefs.h"
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#include <ufs/ufs/dinode.h>
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#include <ufs/ffs/fs.h>
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#include "ffs/buf.h"
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#include "ffs/ufs_inode.h"
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extern int sectorsize; /* XXX: from ffs.c & mkfs.c */
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TAILQ_HEAD(buftailhead,buf) buftail;
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int
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bread(int fd, struct fs *fs, daddr_t blkno, int size, struct buf **bpp)
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{
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off_t offset;
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ssize_t rv;
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assert (fs != NULL);
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assert (bpp != NULL);
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if (debug & DEBUG_BUF_BREAD)
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printf("bread: fs %p blkno %lld size %d\n",
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fs, (long long)blkno, size);
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*bpp = getblk(fd, fs, blkno, size);
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offset = (*bpp)->b_blkno * sectorsize; /* XXX */
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if (debug & DEBUG_BUF_BREAD)
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printf("bread: bp %p blkno %lld offset %lld bcount %ld\n",
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(*bpp), (long long)(*bpp)->b_blkno, (long long) offset,
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(*bpp)->b_bcount);
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if (lseek((*bpp)->b_fd, offset, SEEK_SET) == -1)
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err(1, "bread: lseek %lld (%lld)",
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(long long)(*bpp)->b_blkno, (long long)offset);
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rv = read((*bpp)->b_fd, (*bpp)->b_data, (*bpp)->b_bcount);
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if (debug & DEBUG_BUF_BREAD)
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printf("bread: read %ld (%lld) returned %d\n",
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(*bpp)->b_bcount, (long long)offset, (int)rv);
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if (rv == -1) /* read error */
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err(1, "bread: read %ld (%lld) returned %d",
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(*bpp)->b_bcount, (long long)offset, (int)rv);
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else if (rv != (*bpp)->b_bcount) /* short read */
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err(1, "bread: read %ld (%lld) returned %d",
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(*bpp)->b_bcount, (long long)offset, (int)rv);
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else
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return (0);
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}
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void
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brelse(struct buf *bp)
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{
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assert (bp != NULL);
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assert (bp->b_data != NULL);
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if (bp->b_lblkno < 0) {
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/*
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* XXX don't remove any buffers with negative logical block
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* numbers (lblkno), so that we retain the mapping
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* of negative lblkno -> real blkno that ffs_balloc()
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* sets up.
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*
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* if we instead released these buffers, and implemented
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* ufs_strategy() (and ufs_bmaparray()) and called those
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* from bread() and bwrite() to convert the lblkno to
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* a real blkno, we'd add a lot more code & complexity
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* and reading off disk, for little gain, because this
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* simple hack works for our purpose.
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*/
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bp->b_bcount = 0;
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return;
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}
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TAILQ_REMOVE(&buftail, bp, b_tailq);
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free(bp->b_data);
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free(bp);
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}
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int
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bwrite(struct buf *bp)
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{
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off_t offset;
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ssize_t rv;
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assert (bp != NULL);
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offset = bp->b_blkno * sectorsize; /* XXX */
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if (debug & DEBUG_BUF_BWRITE)
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printf("bwrite: bp %p blkno %lld offset %lld bcount %ld\n",
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bp, (long long)bp->b_blkno, (long long) offset,
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bp->b_bcount);
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if (lseek(bp->b_fd, offset, SEEK_SET) == -1)
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return (errno);
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rv = write(bp->b_fd, bp->b_data, bp->b_bcount);
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if (debug & DEBUG_BUF_BWRITE)
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printf("bwrite: write %ld (offset %lld) returned %lld\n",
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bp->b_bcount, (long long)offset, (long long)rv);
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if (rv == bp->b_bcount)
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return (0);
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else if (rv == -1) /* write error */
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return (errno);
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else /* short write ? */
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return (EAGAIN);
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}
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void
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bcleanup(void)
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{
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struct buf *bp;
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/*
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* XXX this really shouldn't be necessary, but i'm curious to
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* know why there's still some buffers lying around that
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* aren't brelse()d
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*/
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if (TAILQ_EMPTY(&buftail))
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return;
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printf("bcleanup: unflushed buffers:\n");
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TAILQ_FOREACH(bp, &buftail, b_tailq) {
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printf("\tlblkno %10lld blkno %10lld count %6ld bufsize %6ld\n",
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(long long)bp->b_lblkno, (long long)bp->b_blkno,
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bp->b_bcount, bp->b_bufsize);
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}
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printf("bcleanup: done\n");
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}
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struct buf *
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getblk(int fd, struct fs *fs, daddr_t blkno, int size)
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{
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static int buftailinitted;
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struct buf *bp;
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assert (fs != NULL);
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if (debug & DEBUG_BUF_GETBLK)
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printf("getblk: fs %p blkno %lld size %d\n", fs,
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(long long)blkno, size);
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bp = NULL;
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if (!buftailinitted) {
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if (debug & DEBUG_BUF_GETBLK)
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printf("getblk: initialising tailq\n");
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TAILQ_INIT(&buftail);
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buftailinitted = 1;
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} else {
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TAILQ_FOREACH(bp, &buftail, b_tailq) {
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if (bp->b_lblkno != blkno)
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continue;
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break;
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}
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}
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if (bp == NULL) {
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if ((bp = calloc(1, sizeof(struct buf))) == NULL)
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err(1, "getblk: calloc");
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bp->b_bufsize = 0;
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bp->b_blkno = bp->b_lblkno = blkno;
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bp->b_fd = fd;
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bp->b_fs = fs;
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bp->b_data = NULL;
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TAILQ_INSERT_HEAD(&buftail, bp, b_tailq);
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}
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bp->b_bcount = size;
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if (bp->b_data == NULL || bp->b_bcount > bp->b_bufsize) {
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bp->b_bufsize = size;
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if ((bp->b_data = realloc(bp->b_data, bp->b_bufsize)) == NULL)
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err(1, "getblk: realloc b_data %ld", bp->b_bcount);
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}
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return (bp);
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}
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