2 * old (V6 and before) PDP-11 Unix filesystem
15 #define V6IFREG 0100000
16 #define V6IFDIR 0140000
17 #define V6IFCHR 0120000
18 #define V6IFBLK 0160000
20 #define V6LARGE 010000
22 #define V6ROOT 1 /* root inode */
25 #define LINOPB (BLSIZE/sizeof(struct v6dinode))
26 #define LNINDIR (BLSIZE/sizeof(unsigned short))
29 unsigned char flags[2];
34 unsigned char losize[2];
35 unsigned char addr[V6NADDR][2];
36 unsigned char atime[4]; /* pdp-11 order */
37 unsigned char mtime[4]; /* pdp-11 order */
46 Fileinf iget(int ino);
47 long bmap(Ram *r, long bno);
48 void getblk(Ram *r, long bno, char *buf);
56 tapefile = open(name, OREAD);
58 error("Can't open argument file");
74 char name[V6NAMELEN+1];
77 for (i=0; i<r->ndata; i+=sizeof(struct v6dir)) {
79 cp = doread(r, i, BLSIZE);
80 dp = (struct v6dir *)(cp+i%BLSIZE);
81 ino = dp->ino[0] + (dp->ino[1]<<8);
82 if (strcmp(dp->name, ".")==0 || strcmp(dp->name, "..")==0)
87 strncpy(name, dp->name, V6NAMELEN);
88 name[V6NAMELEN] = '\0';
108 doread(Ram *r, vlong off, long cnt)
110 static char buf[Maxbuf+BLSIZE];
116 error("count too large");
121 getblk(r, bno, &buf[i*BLSIZE]);
130 dowrite(Ram *r, char *buf, long off, long cnt)
132 USED(r); USED(buf); USED(off); USED(cnt);
144 * -- no sanity check for now
145 * -- magic inode-to-disk-block stuff here
156 memset(&f, 0, sizeof f);
157 seek(tapefile, BLSIZE*((ino-1)/LINOPB + V6SUPERB + 1), 0);
158 if (read(tapefile, buf, BLSIZE) != BLSIZE)
159 error("Can't read inode");
160 dp = ((struct v6dinode *)buf) + ((ino-1)%LINOPB);
161 flags = (dp->flags[1]<<8) + dp->flags[0];
162 f.size = (dp->hisize << 16) + (dp->losize[1]<<8) + dp->losize[0];
163 if ((flags&V6FMT)==V6IFCHR || (flags&V6FMT)==V6IFBLK)
165 f.data = emalloc(V6NADDR*sizeof(ushort));
166 for (i = 0; i < V6NADDR; i++)
167 ((ushort*)f.data)[i] = (dp->addr[i][1]<<8) + dp->addr[i][0];
168 f.mode = flags & V6MODE;
169 if ((flags&V6FMT)==V6IFDIR)
173 f.mdate = (dp->mtime[2]<<0) + (dp->mtime[3]<<8)
174 +(dp->mtime[0]<<16) + (dp->mtime[1]<<24);
179 getblk(Ram *r, long bno, char *buf)
183 if ((dbno = bmap(r, bno)) == 0) {
184 memset(buf, 0, BLSIZE);
187 seek(tapefile, dbno*BLSIZE, 0);
188 if (read(tapefile, buf, BLSIZE) != BLSIZE)
193 * logical to physical block
194 * only singly-indirect files for now
198 bmap(Ram *r, long bno)
200 unsigned char indbuf[LNINDIR][2];
202 if (r->ndata <= V6NADDR*BLSIZE) { /* assume size predicts largeness of file */
204 return ((ushort*)r->data)[bno];
207 if (bno < V6NADDR*LNINDIR) {
208 seek(tapefile, ((ushort *)r->data)[bno/LNINDIR]*BLSIZE, 0);
209 if (read(tapefile, (char *)indbuf, BLSIZE) != BLSIZE)
211 return ((indbuf[bno%LNINDIR][1]<<8) + indbuf[bno%LNINDIR][0]);