1 /* 2 * Vax 32V Unix filesystem (same as pre-FFS Berkeley) 3 */ 4 #include <u.h> 5 #include <libc.h> 6 #include <auth.h> 7 #include <fcall.h> 8 #include "tapefs.h" 9 10 /* 11 * v32 disk inode 12 */ 13 #define VNADDR 13 14 #define VFMT 0160000 15 #define VIFREG 0100000 16 #define VIFDIR 0040000 17 #define VIFCHR 0120000 18 #define VIFBLK 0160000 19 #define VMODE 0777 20 #define VSUPERB 1 21 #define VROOT 2 /* root inode */ 22 #define VNAMELEN 14 23 #define BLSIZE 512 24 #define LINOPB (BLSIZE/sizeof(struct v32dinode)) 25 #define LNINDIR (BLSIZE/sizeof(unsigned long)) 26 27 struct v32dinode { 28 unsigned char flags[2]; 29 unsigned char nlinks[2]; 30 unsigned char uid[2]; 31 unsigned char gid[2]; 32 unsigned char size[4]; 33 unsigned char addr[40]; 34 unsigned char atime[4]; 35 unsigned char mtime[4]; 36 unsigned char ctime[4]; 37 }; 38 39 struct v32dir { 40 uchar ino[2]; 41 char name[VNAMELEN]; 42 }; 43 44 int tapefile; 45 Fileinf iget(int ino); 46 long bmap(Ram *r, long bno); 47 void getblk(Ram *r, long bno, char *buf); 48 49 void 50 populate(char *name) 51 { 52 Fileinf f; 53 54 replete = 0; 55 tapefile = open(name, OREAD); 56 if (tapefile<0) 57 error("Can't open argument file"); 58 f = iget(VROOT); 59 ram->perm = f.mode; 60 ram->mtime = f.mdate; 61 ram->data = f.addr; 62 ram->ndata = f.size; 63 } 64 65 void 66 popdir(Ram *r) 67 { 68 int i, ino; 69 char *cp; 70 struct v32dir *dp; 71 Fileinf f; 72 char name[VNAMELEN+1]; 73 74 for (i=0; i<r->ndata; i+=sizeof(struct v32dir)) { 75 if (i%BLSIZE==0) 76 cp = doread(r, i, BLSIZE); 77 dp = (struct v32dir *)(cp+i%BLSIZE); 78 ino = g2byte(dp->ino); 79 if (strcmp(dp->name, ".")==0 || strcmp(dp->name, "..")==0) 80 continue; 81 if (ino==0) 82 continue; 83 f = iget(ino); 84 strncpy(name, dp->name, VNAMELEN); 85 name[VNAMELEN+1] = '\0'; 86 f.name = name; 87 popfile(r, f); 88 } 89 r->replete = 1; 90 } 91 92 void 93 dotrunc(Ram *r) 94 { 95 USED(r); 96 } 97 98 void 99 docreate(Ram *r) 100 { 101 USED(r); 102 } 103 104 char * 105 doread(Ram *r, long off, long cnt) 106 { 107 static char buf[MAXFDATA+BLSIZE]; 108 int bno, i; 109 110 bno = off/BLSIZE; 111 off -= bno*BLSIZE; 112 if (cnt>MAXFDATA) 113 error("count too large"); 114 if (off) 115 cnt += BLSIZE-off; 116 i = 0; 117 while (cnt>0) { 118 getblk(r, bno, &buf[i*BLSIZE]); 119 cnt -= BLSIZE; 120 bno++; 121 i++; 122 } 123 return buf; 124 } 125 126 void 127 dowrite(Ram *r, char *buf, long off, long cnt) 128 { 129 USED(r); USED(buf); USED(off); USED(cnt); 130 } 131 132 int 133 dopermw(Ram *r) 134 { 135 USED(r); 136 return 0; 137 } 138 139 /* 140 * fetch an i-node 141 * -- no sanity check for now 142 * -- magic inode-to-disk-block stuff here 143 */ 144 145 Fileinf 146 iget(int ino) 147 { 148 char buf[BLSIZE]; 149 struct v32dinode *dp; 150 long flags, i; 151 Fileinf f; 152 153 seek(tapefile, BLSIZE*((ino-1)/LINOPB + VSUPERB + 1), 0); 154 if (read(tapefile, buf, BLSIZE) != BLSIZE) 155 error("Can't read inode"); 156 dp = ((struct v32dinode *)buf) + ((ino-1)%LINOPB); 157 flags = g2byte(dp->flags); 158 f.size = g4byte(dp->size); 159 if ((flags&VFMT)==VIFCHR || (flags&VFMT)==VIFBLK) 160 f.size = 0; 161 f.addr = emalloc(VNADDR*sizeof(long)); 162 for (i = 0; i < VNADDR; i++) 163 ((long*)f.addr)[i] = g3byte(dp->addr+3*i); 164 f.mode = flags & VMODE; 165 if ((flags&VFMT)==VIFDIR) 166 f.mode |= CHDIR; 167 f.uid = g2byte(dp->uid); 168 f.gid = g2byte(dp->gid); 169 f.mdate = g4byte(dp->mtime); 170 return f; 171 } 172 173 void 174 getblk(Ram *r, long bno, char *buf) 175 { 176 long dbno; 177 178 if ((dbno = bmap(r, bno)) == 0) { 179 memset(buf, 0, BLSIZE); 180 return; 181 } 182 seek(tapefile, dbno*BLSIZE, 0); 183 if (read(tapefile, buf, BLSIZE) != BLSIZE) 184 error("bad read"); 185 } 186 187 /* 188 * logical to physical block 189 * only singly-indirect files for now 190 */ 191 192 long 193 bmap(Ram *r, long bno) 194 { 195 unsigned char indbuf[LNINDIR][sizeof(long)]; 196 197 if (bno < VNADDR-3) 198 return ((long*)r->data)[bno]; 199 if (bno < VNADDR*LNINDIR) { 200 seek(tapefile, ((long *)r->data)[(bno-(VNADDR-3))/LNINDIR]*BLSIZE, 0); 201 if (read(tapefile, (char *)indbuf, BLSIZE) != BLSIZE) 202 return 0; 203 return ((indbuf[bno%LNINDIR][1]<<8) + indbuf[bno%LNINDIR][0]); 204 } 205 return 0; 206 } 207