NetBSD/sys/ufs/ffs/ffs_subr.c

253 lines
6.4 KiB
C

/* $NetBSD: ffs_subr.c,v 1.44 2007/01/29 01:52:46 hubertf Exp $ */
/*
* 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. 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
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ffs_subr.c,v 1.44 2007/01/29 01:52:46 hubertf Exp $");
#include <sys/param.h>
/* in ffs_tables.c */
extern const int inside[], around[];
extern const u_char * const fragtbl[];
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>
#include <ufs/ufs/ufs_bswap.h>
#ifndef _KERNEL
#include <ufs/ufs/dinode.h>
void panic(const char *, ...)
__attribute__((__noreturn__,__format__(__printf__,1,2)));
#else /* _KERNEL */
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/inttypes.h>
#include <sys/pool.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
/*
* Load up the contents of an inode and copy the appropriate pieces
* to the incore copy.
*/
void
ffs_load_inode(struct buf *bp, struct inode *ip, struct fs *fs, ino_t ino)
{
struct ufs1_dinode *dp1;
struct ufs2_dinode *dp2;
if (ip->i_ump->um_fstype == UFS1) {
dp1 = (struct ufs1_dinode *)bp->b_data + ino_to_fsbo(fs, ino);
#ifdef FFS_EI
if (UFS_FSNEEDSWAP(fs))
ffs_dinode1_swap(dp1, ip->i_din.ffs1_din);
else
#endif
*ip->i_din.ffs1_din = *dp1;
ip->i_mode = ip->i_ffs1_mode;
ip->i_nlink = ip->i_ffs1_nlink;
ip->i_size = ip->i_ffs1_size;
ip->i_flags = ip->i_ffs1_flags;
ip->i_gen = ip->i_ffs1_gen;
ip->i_uid = ip->i_ffs1_uid;
ip->i_gid = ip->i_ffs1_gid;
} else {
dp2 = (struct ufs2_dinode *)bp->b_data + ino_to_fsbo(fs, ino);
#ifdef FFS_EI
if (UFS_FSNEEDSWAP(fs))
ffs_dinode2_swap(dp2, ip->i_din.ffs2_din);
else
#endif
*ip->i_din.ffs2_din = *dp2;
ip->i_mode = ip->i_ffs2_mode;
ip->i_nlink = ip->i_ffs2_nlink;
ip->i_size = ip->i_ffs2_size;
ip->i_flags = ip->i_ffs2_flags;
ip->i_gen = ip->i_ffs2_gen;
ip->i_uid = ip->i_ffs2_uid;
ip->i_gid = ip->i_ffs2_gid;
}
}
#endif /* _KERNEL */
/*
* Update the frsum fields to reflect addition or deletion
* of some frags.
*/
void
ffs_fragacct(struct fs *fs, int fragmap, int32_t fraglist[], int cnt,
int needswap)
{
int inblk;
int field, subfield;
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 - 1))))) == 0)
continue;
field = around[siz];
subfield = inside[siz];
for (pos = siz; pos <= fs->fs_frag; pos++) {
if ((fragmap & field) == subfield) {
fraglist[siz] = ufs_rw32(
ufs_rw32(fraglist[siz], needswap) + cnt,
needswap);
pos += siz;
field <<= siz;
subfield <<= siz;
}
field <<= 1;
subfield <<= 1;
}
}
}
/*
* block operations
*
* check if a block is available
* returns true if all the correponding bits in the free map are 1
* returns false if any corresponding bit in the free map is 0
*/
int
ffs_isblock(struct fs *fs, u_char *cp, int32_t h)
{
u_char mask;
switch ((int)fs->fs_fragshift) {
case 3:
return (cp[h] == 0xff);
case 2:
mask = 0x0f << ((h & 0x1) << 2);
return ((cp[h >> 1] & mask) == mask);
case 1:
mask = 0x03 << ((h & 0x3) << 1);
return ((cp[h >> 2] & mask) == mask);
case 0:
mask = 0x01 << (h & 0x7);
return ((cp[h >> 3] & mask) == mask);
default:
panic("ffs_isblock: unknown fs_fragshift %d",
(int)fs->fs_fragshift);
}
}
/*
* check if a block is completely allocated
* returns true if all the corresponding bits in the free map are 0
* returns false if any corresponding bit in the free map is 1
*/
int
ffs_isfreeblock(struct fs *fs, u_char *cp, int32_t h)
{
switch ((int)fs->fs_fragshift) {
case 3:
return (cp[h] == 0);
case 2:
return ((cp[h >> 1] & (0x0f << ((h & 0x1) << 2))) == 0);
case 1:
return ((cp[h >> 2] & (0x03 << ((h & 0x3) << 1))) == 0);
case 0:
return ((cp[h >> 3] & (0x01 << (h & 0x7))) == 0);
default:
panic("ffs_isfreeblock: unknown fs_fragshift %d",
(int)fs->fs_fragshift);
}
}
/*
* take a block out of the map
*/
void
ffs_clrblock(struct fs *fs, u_char *cp, int32_t h)
{
switch ((int)fs->fs_fragshift) {
case 3:
cp[h] = 0;
return;
case 2:
cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2));
return;
case 1:
cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1));
return;
case 0:
cp[h >> 3] &= ~(0x01 << (h & 0x7));
return;
default:
panic("ffs_clrblock: unknown fs_fragshift %d",
(int)fs->fs_fragshift);
}
}
/*
* put a block into the map
*/
void
ffs_setblock(struct fs *fs, u_char *cp, int32_t h)
{
switch ((int)fs->fs_fragshift) {
case 3:
cp[h] = 0xff;
return;
case 2:
cp[h >> 1] |= (0x0f << ((h & 0x1) << 2));
return;
case 1:
cp[h >> 2] |= (0x03 << ((h & 0x3) << 1));
return;
case 0:
cp[h >> 3] |= (0x01 << (h & 0x7));
return;
default:
panic("ffs_setblock: unknown fs_fragshift %d",
(int)fs->fs_fragshift);
}
}