| 1 | /* lfs_vnops.c 4.18 82/02/27 */ |
| 2 | |
| 3 | #include "../h/param.h" |
| 4 | #include "../h/systm.h" |
| 5 | #include "../h/mount.h" |
| 6 | #include "../h/ino.h" |
| 7 | #include "../h/reg.h" |
| 8 | #include "../h/buf.h" |
| 9 | #include "../h/filsys.h" |
| 10 | #include "../h/dir.h" |
| 11 | #include "../h/user.h" |
| 12 | #include "../h/inode.h" |
| 13 | #include "../h/file.h" |
| 14 | #include "../h/conf.h" |
| 15 | #include "../h/stat.h" |
| 16 | #include "../h/inline.h" |
| 17 | #include "../h/socket.h" |
| 18 | #include "../h/socketvar.h" |
| 19 | |
| 20 | /* |
| 21 | * the fstat system call. |
| 22 | */ |
| 23 | fstat() |
| 24 | { |
| 25 | register struct file *fp; |
| 26 | register struct a { |
| 27 | int fdes; |
| 28 | struct stat *sb; |
| 29 | } *uap; |
| 30 | |
| 31 | uap = (struct a *)u.u_ap; |
| 32 | fp = getf(uap->fdes); |
| 33 | if (fp == NULL) |
| 34 | return; |
| 35 | if (fp->f_flag & FSOCKET) |
| 36 | u.u_error = sostat(fp->f_socket, uap->sb); |
| 37 | else |
| 38 | stat1(fp->f_inode, uap->sb); |
| 39 | } |
| 40 | |
| 41 | /* |
| 42 | * Stat system call. This version does not follow links. |
| 43 | */ |
| 44 | stat() |
| 45 | { |
| 46 | register struct inode *ip; |
| 47 | register struct a { |
| 48 | char *fname; |
| 49 | struct stat *sb; |
| 50 | } *uap; |
| 51 | |
| 52 | uap = (struct a *)u.u_ap; |
| 53 | ip = namei(uchar, 0, 0); |
| 54 | if (ip == NULL) |
| 55 | return; |
| 56 | stat1(ip, uap->sb); |
| 57 | iput(ip); |
| 58 | } |
| 59 | |
| 60 | /* |
| 61 | * Lstat system call. This version does follow links. |
| 62 | */ |
| 63 | lstat() |
| 64 | { |
| 65 | register struct inode *ip; |
| 66 | register struct a { |
| 67 | char *fname; |
| 68 | struct stat *sb; |
| 69 | } *uap; |
| 70 | |
| 71 | uap = (struct a *)u.u_ap; |
| 72 | ip = namei(uchar, 0, 1); |
| 73 | if (ip == NULL) |
| 74 | return; |
| 75 | stat1(ip, uap->sb, (off_t)0); |
| 76 | iput(ip); |
| 77 | } |
| 78 | |
| 79 | /* |
| 80 | * The basic routine for fstat and stat: |
| 81 | * get the inode and pass appropriate parts back. |
| 82 | */ |
| 83 | stat1(ip, ub) |
| 84 | register struct inode *ip; |
| 85 | struct stat *ub; |
| 86 | { |
| 87 | register struct dinode *dp; |
| 88 | register struct buf *bp; |
| 89 | struct stat ds; |
| 90 | |
| 91 | IUPDAT(ip, &time, &time, 0); |
| 92 | /* |
| 93 | * First copy from inode table |
| 94 | */ |
| 95 | ds.st_dev = ip->i_dev; |
| 96 | ds.st_ino = ip->i_number; |
| 97 | ds.st_mode = ip->i_mode; |
| 98 | ds.st_nlink = ip->i_nlink; |
| 99 | ds.st_uid = ip->i_uid; |
| 100 | ds.st_gid = ip->i_gid; |
| 101 | ds.st_rdev = (dev_t)ip->i_un.i_rdev; |
| 102 | ds.st_size = ip->i_size; |
| 103 | /* |
| 104 | * next the dates in the disk |
| 105 | */ |
| 106 | bp = bread(ip->i_dev, itod(ip->i_number)); |
| 107 | dp = bp->b_un.b_dino; |
| 108 | dp += itoo(ip->i_number); |
| 109 | ds.st_atime = dp->di_atime; |
| 110 | ds.st_mtime = dp->di_mtime; |
| 111 | ds.st_ctime = dp->di_ctime; |
| 112 | brelse(bp); |
| 113 | if (copyout((caddr_t)&ds, (caddr_t)ub, sizeof(ds)) < 0) |
| 114 | u.u_error = EFAULT; |
| 115 | } |
| 116 | |
| 117 | /* |
| 118 | * Return target name of a symbolic link |
| 119 | */ |
| 120 | readlink() |
| 121 | { |
| 122 | register struct inode *ip; |
| 123 | register struct a { |
| 124 | char *name; |
| 125 | char *buf; |
| 126 | int count; |
| 127 | } *uap; |
| 128 | |
| 129 | ip = namei(uchar, 0, 0); |
| 130 | if (ip == NULL) |
| 131 | return; |
| 132 | if ((ip->i_mode&IFMT) != IFLNK) { |
| 133 | u.u_error = ENXIO; |
| 134 | goto out; |
| 135 | } |
| 136 | uap = (struct a *)u.u_ap; |
| 137 | u.u_offset = 0; |
| 138 | u.u_base = uap->buf; |
| 139 | u.u_count = uap->count; |
| 140 | u.u_segflg = 0; |
| 141 | readi(ip); |
| 142 | out: |
| 143 | iput(ip); |
| 144 | u.u_r.r_val1 = uap->count - u.u_count; |
| 145 | } |
| 146 | |
| 147 | /* |
| 148 | * symlink -- make a symbolic link |
| 149 | */ |
| 150 | symlink() |
| 151 | { |
| 152 | register struct a { |
| 153 | char *target; |
| 154 | char *linkname; |
| 155 | } *uap; |
| 156 | register struct inode *ip; |
| 157 | register char *tp; |
| 158 | register c, nc; |
| 159 | |
| 160 | uap = (struct a *)u.u_ap; |
| 161 | tp = uap->target; |
| 162 | nc = 0; |
| 163 | while (c = fubyte(tp)) { |
| 164 | if (c < 0) { |
| 165 | u.u_error = EFAULT; |
| 166 | return; |
| 167 | } |
| 168 | tp++; |
| 169 | nc++; |
| 170 | } |
| 171 | u.u_dirp = uap->linkname; |
| 172 | ip = namei(uchar, 1, 0); |
| 173 | if (ip) { |
| 174 | iput(ip); |
| 175 | u.u_error = EEXIST; |
| 176 | return; |
| 177 | } |
| 178 | ip = maknode(IFLNK | 0777); |
| 179 | if (ip == NULL) |
| 180 | return; |
| 181 | u.u_base = uap->target; |
| 182 | u.u_count = nc; |
| 183 | u.u_offset = 0; |
| 184 | u.u_segflg = 0; |
| 185 | writei(ip); |
| 186 | iput(ip); |
| 187 | } |
| 188 | |
| 189 | /* |
| 190 | * the dup system call. |
| 191 | */ |
| 192 | dup() |
| 193 | { |
| 194 | register struct file *fp; |
| 195 | register struct a { |
| 196 | int fdes; |
| 197 | int fdes2; |
| 198 | } *uap; |
| 199 | register i, m; |
| 200 | |
| 201 | uap = (struct a *)u.u_ap; |
| 202 | m = uap->fdes & ~077; |
| 203 | uap->fdes &= 077; |
| 204 | fp = getf(uap->fdes); |
| 205 | if (fp == NULL) |
| 206 | return; |
| 207 | if ((m&0100) == 0) { |
| 208 | if ((i = ufalloc()) < 0) |
| 209 | return; |
| 210 | } else { |
| 211 | i = uap->fdes2; |
| 212 | if (i<0 || i>=NOFILE) { |
| 213 | u.u_error = EBADF; |
| 214 | return; |
| 215 | } |
| 216 | u.u_r.r_val1 = i; |
| 217 | } |
| 218 | if (i != uap->fdes) { |
| 219 | if (u.u_ofile[i]!=NULL) |
| 220 | closef(u.u_ofile[i], 0); |
| 221 | if (u.u_error) |
| 222 | return; |
| 223 | u.u_ofile[i] = fp; |
| 224 | fp->f_count++; |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | /* |
| 229 | * Mount system call. |
| 230 | */ |
| 231 | smount() |
| 232 | { |
| 233 | dev_t dev; |
| 234 | register struct inode *ip; |
| 235 | register struct mount *mp; |
| 236 | struct mount *smp; |
| 237 | register struct filsys *fp; |
| 238 | struct buf *bp; |
| 239 | register struct a { |
| 240 | char *fspec; |
| 241 | char *freg; |
| 242 | int ronly; |
| 243 | } *uap; |
| 244 | register char *cp; |
| 245 | |
| 246 | uap = (struct a *)u.u_ap; |
| 247 | dev = getmdev(); |
| 248 | if (u.u_error) |
| 249 | return; |
| 250 | u.u_dirp = (caddr_t)uap->freg; |
| 251 | ip = namei(uchar, 0, 1); |
| 252 | if (ip == NULL) |
| 253 | return; |
| 254 | if (ip->i_count!=1 || (ip->i_mode&IFMT) != IFDIR) |
| 255 | goto out; |
| 256 | smp = NULL; |
| 257 | for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++) { |
| 258 | if (mp->m_bufp != NULL) { |
| 259 | if (dev == mp->m_dev) |
| 260 | goto out; |
| 261 | } else |
| 262 | if (smp == NULL) |
| 263 | smp = mp; |
| 264 | } |
| 265 | mp = smp; |
| 266 | if (mp == NULL) |
| 267 | goto out; |
| 268 | (*bdevsw[major(dev)].d_open)(dev, !uap->ronly); |
| 269 | if (u.u_error) |
| 270 | goto out; |
| 271 | bp = bread(dev, SUPERB); |
| 272 | if (u.u_error) { |
| 273 | brelse(bp); |
| 274 | goto out1; |
| 275 | } |
| 276 | mp->m_inodp = ip; |
| 277 | mp->m_dev = dev; |
| 278 | bp->b_flags |= B_LOCKED; |
| 279 | mp->m_bufp = bp; |
| 280 | fp = bp->b_un.b_filsys; |
| 281 | fp->s_ilock = 0; |
| 282 | fp->s_flock = 0; |
| 283 | fp->s_ronly = uap->ronly & 1; |
| 284 | fp->s_nbehind = 0; |
| 285 | fp->s_lasti = 1; |
| 286 | u.u_dirp = uap->freg; |
| 287 | for (cp = fp->s_fsmnt; cp < &fp->s_fsmnt[sizeof (fp->s_fsmnt) - 1]; ) |
| 288 | if ((*cp++ = uchar()) == 0) |
| 289 | u.u_dirp--; /* get 0 again */ |
| 290 | *cp = 0; |
| 291 | brelse(bp); |
| 292 | ip->i_flag |= IMOUNT; |
| 293 | irele(ip); |
| 294 | return; |
| 295 | |
| 296 | out: |
| 297 | u.u_error = EBUSY; |
| 298 | out1: |
| 299 | iput(ip); |
| 300 | } |
| 301 | |
| 302 | /* |
| 303 | * the umount system call. |
| 304 | */ |
| 305 | sumount() |
| 306 | { |
| 307 | dev_t dev; |
| 308 | register struct inode *ip; |
| 309 | register struct mount *mp; |
| 310 | struct buf *bp; |
| 311 | int stillopen, flag; |
| 312 | register struct a { |
| 313 | char *fspec; |
| 314 | }; |
| 315 | |
| 316 | dev = getmdev(); |
| 317 | if (u.u_error) |
| 318 | return; |
| 319 | xumount(dev); /* remove unused sticky files from text table */ |
| 320 | update(0); |
| 321 | for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++) |
| 322 | if (mp->m_bufp != NULL && dev == mp->m_dev) |
| 323 | goto found; |
| 324 | u.u_error = EINVAL; |
| 325 | return; |
| 326 | |
| 327 | found: |
| 328 | stillopen = 0; |
| 329 | for (ip = inode; ip < inodeNINODE; ip++) |
| 330 | if (ip->i_number != 0 && dev == ip->i_dev) { |
| 331 | u.u_error = EBUSY; |
| 332 | return; |
| 333 | } else if (ip->i_number != 0 && (ip->i_mode&IFMT) == IFBLK && |
| 334 | ip->i_un.i_rdev == dev) |
| 335 | stillopen++; |
| 336 | ip = mp->m_inodp; |
| 337 | ip->i_flag &= ~IMOUNT; |
| 338 | ilock(ip); |
| 339 | iput(ip); |
| 340 | if ((bp = getblk(dev, SUPERB)) != mp->m_bufp) |
| 341 | panic("umount"); |
| 342 | bp->b_flags &= ~B_LOCKED; |
| 343 | flag = !bp->b_un.b_filsys->s_ronly; |
| 344 | mp->m_bufp = NULL; |
| 345 | brelse(bp); |
| 346 | mpurge(mp - &mount[0]); |
| 347 | if (!stillopen) { |
| 348 | (*bdevsw[major(dev)].d_close)(dev, flag); |
| 349 | binval(dev); |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | /* |
| 354 | * Common code for mount and umount. |
| 355 | * Check that the user's argument is a reasonable |
| 356 | * thing on which to mount, and return the device number if so. |
| 357 | */ |
| 358 | dev_t |
| 359 | getmdev() |
| 360 | { |
| 361 | dev_t dev; |
| 362 | register struct inode *ip; |
| 363 | |
| 364 | if (!suser()) |
| 365 | return(NODEV); |
| 366 | ip = namei(uchar, 0, 1); |
| 367 | if (ip == NULL) |
| 368 | return(NODEV); |
| 369 | if ((ip->i_mode&IFMT) != IFBLK) |
| 370 | u.u_error = ENOTBLK; |
| 371 | dev = (dev_t)ip->i_un.i_rdev; |
| 372 | if (major(dev) >= nblkdev) |
| 373 | u.u_error = ENXIO; |
| 374 | iput(ip); |
| 375 | return(dev); |
| 376 | } |