+
+getsb(fs, file)
+ register struct fs *fs;
+ char *file;
+{
+ int i, j, size;
+
+ if (bread(SBLOCK, fs, SBSIZE)) {
+ printf("bad super block");
+ perror(file);
+ nerror |= 04;
+ return;
+ }
+ if (fs->fs_magic != FS_MAGIC) {
+ printf("%s: bad magic number\n", file);
+ nerror |= 04;
+ return;
+ }
+ for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
+ size = sblock.fs_cssize - i < sblock.fs_bsize ?
+ sblock.fs_cssize - i : sblock.fs_bsize;
+ sblock.fs_csp[j] = (struct csum *)calloc(1, size);
+ bread(fsbtodb(fs, fs->fs_csaddr + (j * fs->fs_frag)),
+ (char *)fs->fs_csp[j], size);
+ }
+}
+
+bwrite(blk, buf, size)
+ char *buf;
+ daddr_t blk;
+ register size;
+{
+ if (lseek(fi, blk * DEV_BSIZE, 0) < 0) {
+ perror("FS SEEK");
+ return(1);
+ }
+ if (write(fi, buf, size) != size) {
+ perror("FS WRITE");
+ return(1);
+ }
+ return (0);
+}
+
+bread(bno, buf, cnt)
+ daddr_t bno;
+ char *buf;
+{
+ register i;
+
+ lseek(fi, bno * DEV_BSIZE, 0);
+ if ((i = read(fi, buf, cnt)) != cnt) {
+ if (sflg) {
+ printf("No Update\n");
+ sflg = 0;
+ }
+ for(i=0; i<sblock.fs_bsize; i++)
+ buf[i] = 0;
+ return (1);
+ }
+ return (0);
+}
+
+/*
+ * check if a block is available
+ */
+isblock(fs, cp, h)
+ struct fs *fs;
+ unsigned char *cp;
+ int h;
+{
+ unsigned char mask;
+
+ switch (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:
+#ifdef STANDALONE
+ printf("isblock bad fs_frag %d\n", fs->fs_frag);
+#else
+ fprintf(stderr, "isblock bad fs_frag %d\n", fs->fs_frag);
+#endif
+ return;
+ }
+}
+
+/*
+ * take a block out of the map
+ */
+clrblock(fs, cp, h)
+ struct fs *fs;
+ unsigned char *cp;
+ int h;
+{
+ switch ((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:
+#ifdef STANDALONE
+ printf("clrblock bad fs_frag %d\n", fs->fs_frag);
+#else
+ fprintf(stderr, "clrblock bad fs_frag %d\n", fs->fs_frag);
+#endif
+ return;
+ }
+}
+
+/*
+ * put a block into the map
+ */
+setblock(fs, cp, h)
+ struct fs *fs;
+ unsigned char *cp;
+ int h;
+{
+ switch (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:
+#ifdef STANDALONE
+ printf("setblock bad fs_frag %d\n", fs->fs_frag);
+#else
+ fprintf(stderr, "setblock bad fs_frag %d\n", fs->fs_frag);
+#endif
+ return;
+ }
+}
+
+/* tables.c 4.1 82/03/25 */
+
+/* merged into kernel: tables.c 2.1 3/25/82 */
+
+/* last monet version: partab.c 4.2 81/03/08 */
+
+/*
+ * bit patterns for identifying fragments in the block map
+ * used as ((map & around) == inside)
+ */
+int around[9] = {
+ 0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff
+};
+int inside[9] = {
+ 0x0, 0x2, 0x6, 0xe, 0x1e, 0x3e, 0x7e, 0xfe, 0x1fe
+};
+
+/*
+ * given a block map bit pattern, the frag tables tell whether a
+ * particular size fragment is available.
+ *
+ * used as:
+ * if ((1 << (size - 1)) & fragtbl[fs->fs_frag][map] {
+ * at least one fragment of the indicated size is available
+ * }
+ *
+ * These tables are used by the scanc instruction on the VAX to
+ * quickly find an appropriate fragment.
+ */
+
+unsigned char fragtbl124[256] = {
+ 0x00, 0x16, 0x16, 0x2a, 0x16, 0x16, 0x26, 0x4e,
+ 0x16, 0x16, 0x16, 0x3e, 0x2a, 0x3e, 0x4e, 0x8a,
+ 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
+ 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
+ 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
+ 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
+ 0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
+ 0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
+ 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
+ 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
+ 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
+ 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
+ 0x26, 0x36, 0x36, 0x2e, 0x36, 0x36, 0x26, 0x6e,
+ 0x36, 0x36, 0x36, 0x3e, 0x2e, 0x3e, 0x6e, 0xae,
+ 0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
+ 0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
+ 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
+ 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
+ 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
+ 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
+ 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
+ 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
+ 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
+ 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
+ 0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
+ 0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
+ 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
+ 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
+ 0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
+ 0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
+ 0x8a, 0x9e, 0x9e, 0xaa, 0x9e, 0x9e, 0xae, 0xce,
+ 0x9e, 0x9e, 0x9e, 0xbe, 0xaa, 0xbe, 0xce, 0x8a,
+};
+
+unsigned char fragtbl8[256] = {
+ 0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04,
+ 0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08,
+ 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
+ 0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10,
+ 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
+ 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
+ 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
+ 0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20,
+ 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
+ 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
+ 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
+ 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
+ 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
+ 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
+ 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
+ 0x08, 0x09, 0x09, 0x0a, 0x10, 0x11, 0x20, 0x40,
+ 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
+ 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
+ 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
+ 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
+ 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
+ 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
+ 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
+ 0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21,
+ 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
+ 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
+ 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
+ 0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0a, 0x12,
+ 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
+ 0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0c,
+ 0x08, 0x09, 0x09, 0x0a, 0x09, 0x09, 0x0a, 0x0c,
+ 0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80,
+};
+
+/*
+ * the actual fragtbl array
+ */
+unsigned char *fragtbl[MAXFRAG + 1] = {
+ 0, fragtbl124, fragtbl124, 0, fragtbl124, 0, 0, 0, fragtbl8,
+};
projects / unix-history / blobdiff