1 /* $NetBSD: ffs_subr.c,v 1.32 2003/12/30 12:33:24 pk Exp $ */
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31 * @(#)ffs_subr.c 8.5 (Berkeley) 3/21/95
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include <sys/param.h>
39 #include <ufs/ufs/dinode.h>
40 #include <ufs/ffs/fs.h>
46 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
48 #include <ufs/ffs/ffs_extern.h>
49 #include "ffs/ufs_bswap.h"
50 void panic __P((const char *, ...))
51 __attribute__((__noreturn__,__format__(__printf__,1,2)));
54 * Update the frsum fields to reflect addition or deletion
58 ffs_fragacct_swap(struct fs *fs, int fragmap, int32_t fraglist[], int cnt, int needswap)
64 inblk = (int)(fragtbl[fs->fs_frag][fragmap]) << 1;
66 for (siz = 1; siz < fs->fs_frag; siz++) {
67 if ((inblk & (1 << (siz + (fs->fs_frag & (NBBY - 1))))) == 0)
70 subfield = inside[siz];
71 for (pos = siz; pos <= fs->fs_frag; pos++) {
72 if ((fragmap & field) == subfield) {
73 fraglist[siz] = ufs_rw32(
74 ufs_rw32(fraglist[siz], needswap) + cnt,
89 * check if a block is available
90 * returns true if all the correponding bits in the free map are 1
91 * returns false if any corresponding bit in the free map is 0
94 ffs_isblock(fs, cp, h)
101 switch ((int)fs->fs_fragshift) {
103 return (cp[h] == 0xff);
105 mask = 0x0f << ((h & 0x1) << 2);
106 return ((cp[h >> 1] & mask) == mask);
108 mask = 0x03 << ((h & 0x3) << 1);
109 return ((cp[h >> 2] & mask) == mask);
111 mask = 0x01 << (h & 0x7);
112 return ((cp[h >> 3] & mask) == mask);
114 panic("ffs_isblock: unknown fs_fragshift %d",
115 (int)fs->fs_fragshift);
120 * check if a block is completely allocated
121 * returns true if all the corresponding bits in the free map are 0
122 * returns false if any corresponding bit in the free map is 1
125 ffs_isfreeblock(fs, cp, h)
131 switch ((int)fs->fs_fragshift) {
135 return ((cp[h >> 1] & (0x0f << ((h & 0x1) << 2))) == 0);
137 return ((cp[h >> 2] & (0x03 << ((h & 0x3) << 1))) == 0);
139 return ((cp[h >> 3] & (0x01 << (h & 0x7))) == 0);
141 panic("ffs_isfreeblock: unknown fs_fragshift %d",
142 (int)fs->fs_fragshift);
147 * take a block out of the map
150 ffs_clrblock(fs, cp, h)
156 switch ((int)fs->fs_fragshift) {
161 cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2));
164 cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1));
167 cp[h >> 3] &= ~(0x01 << (h & 0x7));
170 panic("ffs_clrblock: unknown fs_fragshift %d",
171 (int)fs->fs_fragshift);
176 * put a block into the map
179 ffs_setblock(fs, cp, h)
185 switch ((int)fs->fs_fragshift) {
190 cp[h >> 1] |= (0x0f << ((h & 0x1) << 2));
193 cp[h >> 2] |= (0x03 << ((h & 0x3) << 1));
196 cp[h >> 3] |= (0x01 << (h & 0x7));
199 panic("ffs_setblock: unknown fs_fragshift %d",
200 (int)fs->fs_fragshift);