c447342094
is an application space macro and the applications are supposed to be free to use it as they please (but cannot). This is consistant with the other BSD's who made this change quite some time ago. More commits to come.
275 lines
6.2 KiB
C
275 lines
6.2 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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* $FreeBSD$
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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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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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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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