275 lines
6.3 KiB
C
275 lines
6.3 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* @(#)ffs_subr.c 8.5 (Berkeley) 3/21/95
|
|
* $Id: ffs_subr.c,v 1.20 1998/03/08 09:58:59 julian Exp $
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <ufs/ffs/fs.h>
|
|
|
|
#ifndef KERNEL
|
|
#include <ufs/ufs/dinode.h>
|
|
#else
|
|
#include "opt_ddb.h"
|
|
|
|
#include <sys/systm.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/ucred.h>
|
|
|
|
#include <ufs/ufs/quota.h>
|
|
#include <ufs/ufs/inode.h>
|
|
#include <ufs/ffs/ffs_extern.h>
|
|
|
|
#ifdef DDB
|
|
static void ffs_checkoverlap __P((struct buf *, struct inode *));
|
|
#endif
|
|
|
|
/*
|
|
* Return buffer with the contents of block "offset" from the beginning of
|
|
* directory "ip". If "res" is non-zero, fill it in with a pointer to the
|
|
* remaining space in the directory.
|
|
*/
|
|
int
|
|
ffs_blkatoff(vp, offset, res, bpp)
|
|
struct vnode *vp;
|
|
off_t offset;
|
|
char **res;
|
|
struct buf **bpp;
|
|
{
|
|
struct inode *ip;
|
|
register struct fs *fs;
|
|
struct buf *bp;
|
|
ufs_daddr_t lbn;
|
|
int bsize, error;
|
|
|
|
ip = VTOI(vp);
|
|
fs = ip->i_fs;
|
|
lbn = lblkno(fs, offset);
|
|
bsize = blksize(fs, ip, lbn);
|
|
|
|
*bpp = NULL;
|
|
error = bread(vp, lbn, bsize, NOCRED, &bp);
|
|
if (error) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
if (res)
|
|
*res = (char *)bp->b_data + blkoff(fs, offset);
|
|
*bpp = bp;
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Update the frsum fields to reflect addition or deletion
|
|
* of some frags.
|
|
*/
|
|
void
|
|
ffs_fragacct(fs, fragmap, fraglist, cnt)
|
|
struct fs *fs;
|
|
int fragmap;
|
|
int32_t fraglist[];
|
|
int cnt;
|
|
{
|
|
int inblk;
|
|
register int field, subfield;
|
|
register int siz, pos;
|
|
|
|
inblk = (int)(fragtbl[fs->fs_frag][fragmap]) << 1;
|
|
fragmap <<= 1;
|
|
for (siz = 1; siz < fs->fs_frag; siz++) {
|
|
if ((inblk & (1 << (siz + (fs->fs_frag % NBBY)))) == 0)
|
|
continue;
|
|
field = around[siz];
|
|
subfield = inside[siz];
|
|
for (pos = siz; pos <= fs->fs_frag; pos++) {
|
|
if ((fragmap & field) == subfield) {
|
|
fraglist[siz] += cnt;
|
|
pos += siz;
|
|
field <<= siz;
|
|
subfield <<= siz;
|
|
}
|
|
field <<= 1;
|
|
subfield <<= 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef DDB
|
|
static void
|
|
ffs_checkoverlap(bp, ip)
|
|
struct buf *bp;
|
|
struct inode *ip;
|
|
{
|
|
register struct buf *ebp, *ep;
|
|
register ufs_daddr_t start, last;
|
|
struct vnode *vp;
|
|
|
|
ebp = &buf[nbuf];
|
|
start = bp->b_blkno;
|
|
last = start + btodb(bp->b_bcount) - 1;
|
|
for (ep = buf; ep < ebp; ep++) {
|
|
if (ep == bp || (ep->b_flags & B_INVAL) ||
|
|
ep->b_vp == NULLVP)
|
|
continue;
|
|
if (VOP_BMAP(ep->b_vp, (ufs_daddr_t)0, &vp, (ufs_daddr_t)0,
|
|
NULL, NULL))
|
|
continue;
|
|
if (vp != ip->i_devvp)
|
|
continue;
|
|
/* look for overlap */
|
|
if (ep->b_bcount == 0 || ep->b_blkno > last ||
|
|
ep->b_blkno + btodb(ep->b_bcount) <= start)
|
|
continue;
|
|
vprint("Disk overlap", vp);
|
|
(void)printf("\tstart %lu, end %lu overlap start %lu, end %lu\n",
|
|
(u_long)start, (u_long)last, (u_long)ep->b_blkno,
|
|
(u_long)(ep->b_blkno + btodb(ep->b_bcount) - 1));
|
|
panic("ffs_checkoverlap: Disk buffer overlap");
|
|
}
|
|
}
|
|
#endif /* DDB */
|
|
|
|
/*
|
|
* block operations
|
|
*
|
|
* check if a block is available
|
|
*/
|
|
int
|
|
ffs_isblock(fs, cp, h)
|
|
struct fs *fs;
|
|
unsigned char *cp;
|
|
ufs_daddr_t h;
|
|
{
|
|
unsigned char mask;
|
|
|
|
switch ((int)fs->fs_frag) {
|
|
case 8:
|
|
return (cp[h] == 0xff);
|
|
case 4:
|
|
mask = 0x0f << ((h & 0x1) << 2);
|
|
return ((cp[h >> 1] & mask) == mask);
|
|
case 2:
|
|
mask = 0x03 << ((h & 0x3) << 1);
|
|
return ((cp[h >> 2] & mask) == mask);
|
|
case 1:
|
|
mask = 0x01 << (h & 0x7);
|
|
return ((cp[h >> 3] & mask) == mask);
|
|
default:
|
|
panic("ffs_isblock");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* check if a block is free
|
|
*/
|
|
int
|
|
ffs_isfreeblock(fs, cp, h)
|
|
struct fs *fs;
|
|
unsigned char *cp;
|
|
ufs_daddr_t h;
|
|
{
|
|
|
|
switch ((int)fs->fs_frag) {
|
|
case 8:
|
|
return (cp[h] == 0);
|
|
case 4:
|
|
return ((cp[h >> 1] & (0x0f << ((h & 0x1) << 2))) == 0);
|
|
case 2:
|
|
return ((cp[h >> 2] & (0x03 << ((h & 0x3) << 1))) == 0);
|
|
case 1:
|
|
return ((cp[h >> 3] & (0x01 << (h & 0x7))) == 0);
|
|
default:
|
|
panic("ffs_isfreeblock");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* take a block out of the map
|
|
*/
|
|
void
|
|
ffs_clrblock(fs, cp, h)
|
|
struct fs *fs;
|
|
u_char *cp;
|
|
ufs_daddr_t h;
|
|
{
|
|
|
|
switch ((int)fs->fs_frag) {
|
|
case 8:
|
|
cp[h] = 0;
|
|
return;
|
|
case 4:
|
|
cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2));
|
|
return;
|
|
case 2:
|
|
cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1));
|
|
return;
|
|
case 1:
|
|
cp[h >> 3] &= ~(0x01 << (h & 0x7));
|
|
return;
|
|
default:
|
|
panic("ffs_clrblock");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* put a block into the map
|
|
*/
|
|
void
|
|
ffs_setblock(fs, cp, h)
|
|
struct fs *fs;
|
|
unsigned char *cp;
|
|
ufs_daddr_t h;
|
|
{
|
|
|
|
switch ((int)fs->fs_frag) {
|
|
|
|
case 8:
|
|
cp[h] = 0xff;
|
|
return;
|
|
case 4:
|
|
cp[h >> 1] |= (0x0f << ((h & 0x1) << 2));
|
|
return;
|
|
case 2:
|
|
cp[h >> 2] |= (0x03 << ((h & 0x3) << 1));
|
|
return;
|
|
case 1:
|
|
cp[h >> 3] |= (0x01 << (h & 0x7));
|
|
return;
|
|
default:
|
|
panic("ffs_setblock");
|
|
}
|
|
}
|