1 /* $NetBSD: ffs_subr.c,v 1.32 2003/12/30 12:33:24 pk Exp $ */
4 * Copyright (c) 1982, 1986, 1989, 1993
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31 * @(#)ffs_subr.c 8.5 (Berkeley) 3/21/95
34 #include <sys/cdefs.h>
36 __KERNEL_RCSID(0, "$NetBSD: ffs_subr.c,v 1.32 2003/12/30 12:33:24 pk Exp $");
38 __FBSDID("$FreeBSD$");
40 #include <sys/param.h>
42 #include <ufs/ufs/dinode.h>
43 #include <ufs/ffs/fs.h>
49 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
51 #include <ufs/ffs/ffs_extern.h>
52 #include "ffs/ufs_bswap.h"
53 void panic __P((const char *, ...))
54 __attribute__((__noreturn__,__format__(__printf__,1,2)));
57 * Update the frsum fields to reflect addition or deletion
61 ffs_fragacct_swap(struct fs *fs, int fragmap, int32_t fraglist[], int cnt, int needswap)
67 inblk = (int)(fragtbl[fs->fs_frag][fragmap]) << 1;
69 for (siz = 1; siz < fs->fs_frag; siz++) {
70 if ((inblk & (1 << (siz + (fs->fs_frag & (NBBY - 1))))) == 0)
73 subfield = inside[siz];
74 for (pos = siz; pos <= fs->fs_frag; pos++) {
75 if ((fragmap & field) == subfield) {
76 fraglist[siz] = ufs_rw32(
77 ufs_rw32(fraglist[siz], needswap) + cnt,
92 * check if a block is available
93 * returns true if all the correponding bits in the free map are 1
94 * returns false if any corresponding bit in the free map is 0
97 ffs_isblock(fs, cp, h)
104 switch ((int)fs->fs_fragshift) {
106 return (cp[h] == 0xff);
108 mask = 0x0f << ((h & 0x1) << 2);
109 return ((cp[h >> 1] & mask) == mask);
111 mask = 0x03 << ((h & 0x3) << 1);
112 return ((cp[h >> 2] & mask) == mask);
114 mask = 0x01 << (h & 0x7);
115 return ((cp[h >> 3] & mask) == mask);
117 panic("ffs_isblock: unknown fs_fragshift %d",
118 (int)fs->fs_fragshift);
123 * check if a block is completely allocated
124 * returns true if all the corresponding bits in the free map are 0
125 * returns false if any corresponding bit in the free map is 1
128 ffs_isfreeblock(fs, cp, h)
134 switch ((int)fs->fs_fragshift) {
138 return ((cp[h >> 1] & (0x0f << ((h & 0x1) << 2))) == 0);
140 return ((cp[h >> 2] & (0x03 << ((h & 0x3) << 1))) == 0);
142 return ((cp[h >> 3] & (0x01 << (h & 0x7))) == 0);
144 panic("ffs_isfreeblock: unknown fs_fragshift %d",
145 (int)fs->fs_fragshift);
150 * take a block out of the map
153 ffs_clrblock(fs, cp, h)
159 switch ((int)fs->fs_fragshift) {
164 cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2));
167 cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1));
170 cp[h >> 3] &= ~(0x01 << (h & 0x7));
173 panic("ffs_clrblock: unknown fs_fragshift %d",
174 (int)fs->fs_fragshift);
179 * put a block into the map
182 ffs_setblock(fs, cp, h)
188 switch ((int)fs->fs_fragshift) {
193 cp[h >> 1] |= (0x0f << ((h & 0x1) << 2));
196 cp[h >> 2] |= (0x03 << ((h & 0x3) << 1));
199 cp[h >> 3] |= (0x01 << (h & 0x7));
202 panic("ffs_setblock: unknown fs_fragshift %d",
203 (int)fs->fs_fragshift);