1 /* $NetBSD: ffs_subr.c,v 1.32 2003/12/30 12:33:24 pk Exp $ */
4 * SPDX-License-Identifier: BSD-3-Clause
6 * Copyright (c) 1982, 1986, 1989, 1993
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10 * modification, are permitted provided that the following conditions
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33 * @(#)ffs_subr.c 8.5 (Berkeley) 3/21/95
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
39 #include <sys/param.h>
40 #include <sys/types.h>
42 #include <ufs/ufs/dinode.h>
43 #include <ufs/ffs/fs.h>
44 #include "ffs/ffs_extern.h"
45 #include "ffs/ufs_bswap.h"
48 * Update the frsum fields to reflect addition or deletion
52 ffs_fragacct_swap(struct fs *fs, int fragmap, int32_t fraglist[], int cnt, int needswap)
58 inblk = (int)(fragtbl[fs->fs_frag][fragmap]) << 1;
60 for (siz = 1; siz < fs->fs_frag; siz++) {
61 if ((inblk & (1 << (siz + (fs->fs_frag & (NBBY - 1))))) == 0)
64 subfield = inside[siz];
65 for (pos = siz; pos <= fs->fs_frag; pos++) {
66 if ((fragmap & field) == subfield) {
67 fraglist[siz] = ufs_rw32(
68 ufs_rw32(fraglist[siz], needswap) + cnt,
83 * check if a block is available
84 * returns true if all the corresponding bits in the free map are 1
85 * returns false if any corresponding bit in the free map is 0
88 ffs_isblock(struct fs *fs, u_char *cp, int32_t h)
92 switch ((int)fs->fs_fragshift) {
94 return (cp[h] == 0xff);
96 mask = 0x0f << ((h & 0x1) << 2);
97 return ((cp[h >> 1] & mask) == mask);
99 mask = 0x03 << ((h & 0x3) << 1);
100 return ((cp[h >> 2] & mask) == mask);
102 mask = 0x01 << (h & 0x7);
103 return ((cp[h >> 3] & mask) == mask);
105 panic("ffs_isblock: unknown fs_fragshift %d",
106 (int)fs->fs_fragshift);
111 * check if a block is completely allocated
112 * returns true if all the corresponding bits in the free map are 0
113 * returns false if any corresponding bit in the free map is 1
116 ffs_isfreeblock(struct fs *fs, u_char *cp, int32_t h)
119 switch ((int)fs->fs_fragshift) {
123 return ((cp[h >> 1] & (0x0f << ((h & 0x1) << 2))) == 0);
125 return ((cp[h >> 2] & (0x03 << ((h & 0x3) << 1))) == 0);
127 return ((cp[h >> 3] & (0x01 << (h & 0x7))) == 0);
129 panic("ffs_isfreeblock: unknown fs_fragshift %d",
130 (int)fs->fs_fragshift);
135 * take a block out of the map
138 ffs_clrblock(struct fs *fs, u_char *cp, int32_t h)
141 switch ((int)fs->fs_fragshift) {
146 cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2));
149 cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1));
152 cp[h >> 3] &= ~(0x01 << (h & 0x7));
155 panic("ffs_clrblock: unknown fs_fragshift %d",
156 (int)fs->fs_fragshift);
161 * put a block into the map
164 ffs_setblock(struct fs *fs, u_char *cp, int32_t h)
167 switch ((int)fs->fs_fragshift) {
172 cp[h >> 1] |= (0x0f << ((h & 0x1) << 2));
175 cp[h >> 2] |= (0x03 << ((h & 0x3) << 1));
178 cp[h >> 3] |= (0x01 << (h & 0x7));
181 panic("ffs_setblock: unknown fs_fragshift %d",
182 (int)fs->fs_fragshift);