275 lines
6.3 KiB
C
275 lines
6.3 KiB
C
/*
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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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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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* @(#)ffs_subr.c 8.5 (Berkeley) 3/21/95
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* $Id: ffs_subr.c,v 1.21 1998/03/28 10:33:26 bde Exp $
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*/
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#include <sys/param.h>
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#include <ufs/ffs/fs.h>
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#ifndef KERNEL
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#include <ufs/ufs/dinode.h>
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#else
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#include "opt_ddb.h"
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/vnode.h>
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#include <sys/buf.h>
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#include <sys/ucred.h>
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#include <ufs/ufs/quota.h>
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#include <ufs/ufs/inode.h>
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#include <ufs/ffs/ffs_extern.h>
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#ifdef DDB
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static void ffs_checkoverlap __P((struct buf *, struct inode *));
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#endif
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/*
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* Return buffer with the contents of block "offset" from the beginning of
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* directory "ip". If "res" is non-zero, fill it in with a pointer to the
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* remaining space in the directory.
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*/
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int
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ffs_blkatoff(vp, offset, res, bpp)
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struct vnode *vp;
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off_t offset;
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char **res;
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struct buf **bpp;
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{
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struct inode *ip;
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register struct fs *fs;
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struct buf *bp;
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ufs_daddr_t lbn;
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int bsize, error;
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ip = VTOI(vp);
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fs = ip->i_fs;
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lbn = lblkno(fs, offset);
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bsize = blksize(fs, ip, lbn);
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*bpp = NULL;
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error = bread(vp, lbn, bsize, NOCRED, &bp);
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if (error) {
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brelse(bp);
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return (error);
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}
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if (res)
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*res = (char *)bp->b_data + blkoff(fs, offset);
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*bpp = bp;
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return (0);
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}
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#endif
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/*
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* Update the frsum fields to reflect addition or deletion
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* of some frags.
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*/
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void
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ffs_fragacct(fs, fragmap, fraglist, cnt)
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struct fs *fs;
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int fragmap;
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int32_t fraglist[];
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int cnt;
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{
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int inblk;
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register int field, subfield;
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register int siz, pos;
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inblk = (int)(fragtbl[fs->fs_frag][fragmap]) << 1;
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fragmap <<= 1;
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for (siz = 1; siz < fs->fs_frag; siz++) {
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if ((inblk & (1 << (siz + (fs->fs_frag % NBBY)))) == 0)
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continue;
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field = around[siz];
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subfield = inside[siz];
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for (pos = siz; pos <= fs->fs_frag; pos++) {
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if ((fragmap & field) == subfield) {
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fraglist[siz] += cnt;
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pos += siz;
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field <<= siz;
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subfield <<= siz;
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}
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field <<= 1;
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subfield <<= 1;
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}
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}
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}
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#ifdef DDB
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static void
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ffs_checkoverlap(bp, ip)
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struct buf *bp;
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struct inode *ip;
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{
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register struct buf *ebp, *ep;
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register ufs_daddr_t start, last;
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struct vnode *vp;
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ebp = &buf[nbuf];
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start = bp->b_blkno;
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last = start + btodb(bp->b_bcount) - 1;
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for (ep = buf; ep < ebp; ep++) {
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if (ep == bp || (ep->b_flags & B_INVAL) ||
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ep->b_vp == NULLVP)
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continue;
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if (VOP_BMAP(ep->b_vp, (ufs_daddr_t)0, &vp, (ufs_daddr_t *)NULL,
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(int *)NULL, (int *)NULL))
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continue;
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if (vp != ip->i_devvp)
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continue;
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/* look for overlap */
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if (ep->b_bcount == 0 || ep->b_blkno > last ||
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ep->b_blkno + btodb(ep->b_bcount) <= start)
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continue;
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vprint("Disk overlap", vp);
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(void)printf("\tstart %lu, end %lu overlap start %lu, end %lu\n",
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(u_long)start, (u_long)last, (u_long)ep->b_blkno,
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(u_long)(ep->b_blkno + btodb(ep->b_bcount) - 1));
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panic("ffs_checkoverlap: Disk buffer overlap");
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}
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}
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#endif /* DDB */
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/*
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* block operations
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*
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* check if a block is available
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*/
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int
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ffs_isblock(fs, cp, h)
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struct fs *fs;
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unsigned char *cp;
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ufs_daddr_t h;
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{
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unsigned char mask;
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switch ((int)fs->fs_frag) {
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case 8:
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return (cp[h] == 0xff);
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case 4:
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mask = 0x0f << ((h & 0x1) << 2);
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return ((cp[h >> 1] & mask) == mask);
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case 2:
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mask = 0x03 << ((h & 0x3) << 1);
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return ((cp[h >> 2] & mask) == mask);
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case 1:
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mask = 0x01 << (h & 0x7);
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return ((cp[h >> 3] & mask) == mask);
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default:
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panic("ffs_isblock");
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}
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}
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/*
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* check if a block is free
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*/
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int
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ffs_isfreeblock(fs, cp, h)
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struct fs *fs;
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unsigned char *cp;
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ufs_daddr_t h;
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{
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switch ((int)fs->fs_frag) {
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case 8:
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return (cp[h] == 0);
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case 4:
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return ((cp[h >> 1] & (0x0f << ((h & 0x1) << 2))) == 0);
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case 2:
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return ((cp[h >> 2] & (0x03 << ((h & 0x3) << 1))) == 0);
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case 1:
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return ((cp[h >> 3] & (0x01 << (h & 0x7))) == 0);
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default:
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panic("ffs_isfreeblock");
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}
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}
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/*
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* take a block out of the map
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*/
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void
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ffs_clrblock(fs, cp, h)
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struct fs *fs;
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u_char *cp;
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ufs_daddr_t h;
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{
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switch ((int)fs->fs_frag) {
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case 8:
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cp[h] = 0;
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return;
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case 4:
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cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2));
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return;
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case 2:
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cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1));
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return;
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case 1:
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cp[h >> 3] &= ~(0x01 << (h & 0x7));
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return;
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default:
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panic("ffs_clrblock");
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}
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}
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/*
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* put a block into the map
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*/
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void
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ffs_setblock(fs, cp, h)
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struct fs *fs;
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unsigned char *cp;
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ufs_daddr_t h;
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{
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switch ((int)fs->fs_frag) {
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case 8:
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cp[h] = 0xff;
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return;
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case 4:
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cp[h >> 1] |= (0x0f << ((h & 0x1) << 2));
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return;
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case 2:
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cp[h >> 2] |= (0x03 << ((h & 0x3) << 1));
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return;
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case 1:
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cp[h >> 3] |= (0x01 << (h & 0x7));
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return;
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default:
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panic("ffs_setblock");
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}
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}
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