| 1 | /* ufs_vnops.c 4.38 82/10/10 */ |
| 2 | |
| 3 | #include "../h/param.h" |
| 4 | #include "../h/systm.h" |
| 5 | #include "../h/dir.h" |
| 6 | #include "../h/user.h" |
| 7 | #include "../h/kernel.h" |
| 8 | #include "../h/file.h" |
| 9 | #include "../h/stat.h" |
| 10 | #include "../h/inode.h" |
| 11 | #include "../h/fs.h" |
| 12 | #include "../h/buf.h" |
| 13 | #include "../h/proc.h" |
| 14 | #include "../h/quota.h" |
| 15 | #include "../h/descrip.h" |
| 16 | #include "../h/uio.h" |
| 17 | #include "../h/socket.h" |
| 18 | |
| 19 | chdir() |
| 20 | { |
| 21 | |
| 22 | chdirec(&u.u_cdir); |
| 23 | } |
| 24 | |
| 25 | chroot() |
| 26 | { |
| 27 | |
| 28 | if (suser()) |
| 29 | chdirec(&u.u_rdir); |
| 30 | } |
| 31 | |
| 32 | chdirec(ipp) |
| 33 | register struct inode **ipp; |
| 34 | { |
| 35 | register struct inode *ip; |
| 36 | struct a { |
| 37 | char *fname; |
| 38 | }; |
| 39 | |
| 40 | ip = namei(uchar, 0, 1); |
| 41 | if(ip == NULL) |
| 42 | return; |
| 43 | if((ip->i_mode&IFMT) != IFDIR) { |
| 44 | u.u_error = ENOTDIR; |
| 45 | goto bad; |
| 46 | } |
| 47 | if(access(ip, IEXEC)) |
| 48 | goto bad; |
| 49 | iunlock(ip); |
| 50 | if (*ipp) |
| 51 | irele(*ipp); |
| 52 | *ipp = ip; |
| 53 | return; |
| 54 | |
| 55 | bad: |
| 56 | iput(ip); |
| 57 | } |
| 58 | |
| 59 | /* |
| 60 | * Open system call. |
| 61 | */ |
| 62 | open() |
| 63 | { |
| 64 | register struct inode *ip; |
| 65 | register struct a { |
| 66 | char *fname; |
| 67 | int flags; |
| 68 | int mode; |
| 69 | } *uap; |
| 70 | int checkpermissions = 1; |
| 71 | |
| 72 | uap = (struct a *)u.u_ap; |
| 73 | if (uap->flags&FCREATE) { |
| 74 | ip = namei(uchar, 1, 1); |
| 75 | if (ip == NULL) { |
| 76 | if (u.u_error) |
| 77 | return; |
| 78 | ip = maknode(uap->mode&07777&(~ISVTX)); |
| 79 | checkpermissions = 0; |
| 80 | uap->flags &= ~FTRUNCATE; |
| 81 | } |
| 82 | } else |
| 83 | ip = namei(uchar, 0, 1); |
| 84 | if (ip == NULL) |
| 85 | return; |
| 86 | open1(ip, ++uap->flags, checkpermissions); |
| 87 | } |
| 88 | |
| 89 | #ifndef NOCOMPAT |
| 90 | /* |
| 91 | * Creat system call. |
| 92 | */ |
| 93 | ocreat() |
| 94 | { |
| 95 | register struct inode *ip; |
| 96 | register struct a { |
| 97 | char *fname; |
| 98 | int fmode; |
| 99 | } *uap; |
| 100 | |
| 101 | uap = (struct a *)u.u_ap; |
| 102 | ip = namei(uchar, 1, 1); |
| 103 | if (ip == NULL) { |
| 104 | if (u.u_error) |
| 105 | return; |
| 106 | ip = maknode(uap->fmode&07777&(~ISVTX)); |
| 107 | if (ip == NULL) |
| 108 | return; |
| 109 | open1(ip, FWRITE, 0); |
| 110 | } else |
| 111 | open1(ip, FWRITE|FTRUNCATE, 0); |
| 112 | } |
| 113 | #endif |
| 114 | |
| 115 | /* |
| 116 | * Common code for open and creat. |
| 117 | * Check permissions (if we haven't done so already), |
| 118 | * allocate an open file structure, and call |
| 119 | * the device open routine, if any. |
| 120 | */ |
| 121 | open1(ip, mode, checkpermissions) |
| 122 | register struct inode *ip; |
| 123 | register mode; |
| 124 | { |
| 125 | register struct file *fp; |
| 126 | int i, flags; |
| 127 | |
| 128 | if (checkpermissions) { |
| 129 | if (mode&FREAD) |
| 130 | if (access(ip, IREAD)) |
| 131 | goto bad; |
| 132 | if (mode&FWRITE) { |
| 133 | if (access(ip, IWRITE)) |
| 134 | goto bad; |
| 135 | if ((ip->i_mode&IFMT) == IFDIR) { |
| 136 | u.u_error = EISDIR; |
| 137 | goto bad; |
| 138 | } |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | /* |
| 143 | * Check locking on inode. Release "inode lock" |
| 144 | * while doing so in case we block inside flocki. |
| 145 | */ |
| 146 | flags = 0; |
| 147 | if (mode&(FRDLOCK|FWRLOCK)) { |
| 148 | iunlock(ip); |
| 149 | flags = flocki(ip, 0, mode); |
| 150 | ilock(ip); |
| 151 | if (u.u_error) |
| 152 | goto bad; |
| 153 | } |
| 154 | if (mode&FTRUNCATE) |
| 155 | itrunc(ip, 0); |
| 156 | iunlock(ip); |
| 157 | if ((fp = falloc()) == NULL) |
| 158 | goto out; |
| 159 | fp->f_flag = mode & FMODES; |
| 160 | fp->f_type = DTYPE_FILE; |
| 161 | i = u.u_r.r_val1; |
| 162 | fp->f_inode = ip; |
| 163 | openi(ip, mode); |
| 164 | if (u.u_error == 0) { |
| 165 | u.u_pofile[i] = flags; |
| 166 | return; |
| 167 | } |
| 168 | u.u_ofile[i] = NULL; |
| 169 | fp->f_count--; |
| 170 | out: |
| 171 | irele(ip); |
| 172 | return; |
| 173 | bad: |
| 174 | iput(ip); |
| 175 | } |
| 176 | |
| 177 | /* |
| 178 | * Mknod system call |
| 179 | */ |
| 180 | mknod() |
| 181 | { |
| 182 | register struct inode *ip; |
| 183 | register struct a { |
| 184 | char *fname; |
| 185 | int fmode; |
| 186 | int dev; |
| 187 | } *uap; |
| 188 | |
| 189 | uap = (struct a *)u.u_ap; |
| 190 | if (suser()) { |
| 191 | ip = namei(uchar, 1, 0); |
| 192 | if (ip != NULL) { |
| 193 | u.u_error = EEXIST; |
| 194 | goto out; |
| 195 | } |
| 196 | } |
| 197 | if (u.u_error) |
| 198 | return; |
| 199 | ip = maknode(uap->fmode); |
| 200 | if (ip == NULL) |
| 201 | return; |
| 202 | if (uap->dev) { |
| 203 | /* |
| 204 | * Want to be able to use this to make badblock |
| 205 | * inodes, so don't truncate the dev number. |
| 206 | */ |
| 207 | ip->i_rdev = uap->dev; |
| 208 | ip->i_flag |= IACC|IUPD|ICHG; |
| 209 | } |
| 210 | |
| 211 | out: |
| 212 | iput(ip); |
| 213 | } |
| 214 | |
| 215 | /* |
| 216 | * link system call |
| 217 | */ |
| 218 | link() |
| 219 | { |
| 220 | register struct inode *ip, *xp; |
| 221 | register struct a { |
| 222 | char *target; |
| 223 | char *linkname; |
| 224 | } *uap; |
| 225 | |
| 226 | uap = (struct a *)u.u_ap; |
| 227 | ip = namei(uchar, 0, 1); /* well, this routine is doomed anyhow */ |
| 228 | if (ip == NULL) |
| 229 | return; |
| 230 | if ((ip->i_mode&IFMT)==IFDIR && !suser()) { |
| 231 | iput(ip); |
| 232 | return; |
| 233 | } |
| 234 | ip->i_nlink++; |
| 235 | ip->i_flag |= ICHG; |
| 236 | iupdat(ip, &time.tv_sec, &time.tv_sec, 1); |
| 237 | iunlock(ip); |
| 238 | u.u_dirp = (caddr_t)uap->linkname; |
| 239 | xp = namei(uchar, 1, 0); |
| 240 | if (xp != NULL) { |
| 241 | u.u_error = EEXIST; |
| 242 | iput(xp); |
| 243 | goto out; |
| 244 | } |
| 245 | if (u.u_error) |
| 246 | goto out; |
| 247 | if (u.u_pdir->i_dev != ip->i_dev) { |
| 248 | iput(u.u_pdir); |
| 249 | u.u_error = EXDEV; |
| 250 | goto out; |
| 251 | } |
| 252 | direnter(ip); |
| 253 | out: |
| 254 | if (u.u_error) { |
| 255 | ip->i_nlink--; |
| 256 | ip->i_flag |= ICHG; |
| 257 | } |
| 258 | irele(ip); |
| 259 | } |
| 260 | |
| 261 | /* |
| 262 | * symlink -- make a symbolic link |
| 263 | */ |
| 264 | symlink() |
| 265 | { |
| 266 | register struct a { |
| 267 | char *target; |
| 268 | char *linkname; |
| 269 | } *uap; |
| 270 | register struct inode *ip; |
| 271 | register char *tp; |
| 272 | register c, nc; |
| 273 | |
| 274 | uap = (struct a *)u.u_ap; |
| 275 | tp = uap->target; |
| 276 | nc = 0; |
| 277 | while (c = fubyte(tp)) { |
| 278 | if (c < 0) { |
| 279 | u.u_error = EFAULT; |
| 280 | return; |
| 281 | } |
| 282 | tp++; |
| 283 | nc++; |
| 284 | } |
| 285 | u.u_dirp = uap->linkname; |
| 286 | ip = namei(uchar, 1, 0); |
| 287 | if (ip) { |
| 288 | iput(ip); |
| 289 | u.u_error = EEXIST; |
| 290 | return; |
| 291 | } |
| 292 | if (u.u_error) |
| 293 | return; |
| 294 | ip = maknode(IFLNK | 0777); |
| 295 | if (ip == NULL) |
| 296 | return; |
| 297 | u.u_error = rdwri(UIO_WRITE, ip, uap->target, nc, 0, 0, (int *)0); |
| 298 | iput(ip); |
| 299 | } |
| 300 | |
| 301 | /* |
| 302 | * Unlink system call. |
| 303 | * Hard to avoid races here, especially |
| 304 | * in unlinking directories. |
| 305 | */ |
| 306 | unlink() |
| 307 | { |
| 308 | register struct inode *ip, *pp; |
| 309 | struct a { |
| 310 | char *fname; |
| 311 | }; |
| 312 | int unlinkingdot = 0; |
| 313 | |
| 314 | pp = namei(uchar, 2, 0); |
| 315 | if (pp == NULL) |
| 316 | return; |
| 317 | |
| 318 | /* |
| 319 | * Check for unlink(".") |
| 320 | * to avoid hanging on the iget |
| 321 | */ |
| 322 | if (pp->i_number == u.u_dent.d_ino) { |
| 323 | ip = pp; |
| 324 | ip->i_count++; |
| 325 | unlinkingdot++; |
| 326 | } else |
| 327 | ip = iget(pp->i_dev, pp->i_fs, u.u_dent.d_ino); |
| 328 | if(ip == NULL) |
| 329 | goto out1; |
| 330 | if((ip->i_mode&IFMT)==IFDIR && !suser()) |
| 331 | goto out; |
| 332 | /* |
| 333 | * Don't unlink a mounted file. |
| 334 | */ |
| 335 | if (ip->i_dev != pp->i_dev) { |
| 336 | u.u_error = EBUSY; |
| 337 | goto out; |
| 338 | } |
| 339 | if (ip->i_flag&ITEXT) |
| 340 | xrele(ip); /* try once to free text */ |
| 341 | if (dirremove()) { |
| 342 | ip->i_nlink--; |
| 343 | ip->i_flag |= ICHG; |
| 344 | } |
| 345 | out: |
| 346 | if (unlinkingdot) |
| 347 | irele(ip); |
| 348 | else |
| 349 | iput(ip); |
| 350 | out1: |
| 351 | iput(pp); |
| 352 | } |
| 353 | |
| 354 | /* |
| 355 | * Seek system call |
| 356 | */ |
| 357 | lseek() |
| 358 | { |
| 359 | register struct file *fp; |
| 360 | register struct a { |
| 361 | int fd; |
| 362 | off_t off; |
| 363 | int sbase; |
| 364 | } *uap; |
| 365 | |
| 366 | uap = (struct a *)u.u_ap; |
| 367 | fp = getf(uap->fd); |
| 368 | if (fp == NULL) |
| 369 | return; |
| 370 | if (fp->f_type == DTYPE_SOCKET) { |
| 371 | u.u_error = ESPIPE; |
| 372 | return; |
| 373 | } |
| 374 | if (uap->sbase == FSEEK_RELATIVE) |
| 375 | uap->off += fp->f_offset; |
| 376 | else if (uap->sbase == FSEEK_EOF) |
| 377 | uap->off += fp->f_inode->i_size; |
| 378 | fp->f_offset = uap->off; |
| 379 | u.u_r.r_off = uap->off; |
| 380 | } |
| 381 | |
| 382 | /* |
| 383 | * Access system call |
| 384 | */ |
| 385 | saccess() |
| 386 | { |
| 387 | register svuid, svgid; |
| 388 | register struct inode *ip; |
| 389 | register struct a { |
| 390 | char *fname; |
| 391 | int fmode; |
| 392 | } *uap; |
| 393 | |
| 394 | uap = (struct a *)u.u_ap; |
| 395 | svuid = u.u_uid; |
| 396 | svgid = u.u_gid; |
| 397 | u.u_uid = u.u_ruid; |
| 398 | u.u_gid = u.u_rgid; |
| 399 | ip = namei(uchar, 0, 1); |
| 400 | if (ip != NULL) { |
| 401 | if (uap->fmode&FACCESS_READ && access(ip, IREAD)) |
| 402 | goto done; |
| 403 | if (uap->fmode&FACCESS_WRITE && access(ip, IWRITE)) |
| 404 | goto done; |
| 405 | if (uap->fmode&FACCESS_EXECUTE && access(ip, IEXEC)) |
| 406 | goto done; |
| 407 | done: |
| 408 | iput(ip); |
| 409 | } |
| 410 | u.u_uid = svuid; |
| 411 | u.u_gid = svgid; |
| 412 | } |
| 413 | |
| 414 | /* |
| 415 | * the fstat system call. |
| 416 | */ |
| 417 | fstat() |
| 418 | { |
| 419 | register struct file *fp; |
| 420 | register struct a { |
| 421 | int fd; |
| 422 | struct stat *sb; |
| 423 | } *uap; |
| 424 | |
| 425 | uap = (struct a *)u.u_ap; |
| 426 | fp = getf(uap->fd); |
| 427 | if (fp == NULL) |
| 428 | return; |
| 429 | if (fp->f_type == DTYPE_SOCKET) |
| 430 | u.u_error = sostat(fp->f_socket, uap->sb); |
| 431 | else |
| 432 | stat1(fp->f_inode, uap->sb); |
| 433 | } |
| 434 | |
| 435 | /* |
| 436 | * Stat system call. This version follows links. |
| 437 | */ |
| 438 | stat() |
| 439 | { |
| 440 | register struct inode *ip; |
| 441 | register struct a { |
| 442 | char *fname; |
| 443 | struct stat *sb; |
| 444 | } *uap; |
| 445 | |
| 446 | uap = (struct a *)u.u_ap; |
| 447 | ip = namei(uchar, 0, 1); |
| 448 | if (ip == NULL) |
| 449 | return; |
| 450 | stat1(ip, uap->sb); |
| 451 | iput(ip); |
| 452 | } |
| 453 | |
| 454 | /* |
| 455 | * Lstat system call. This version does not follow links. |
| 456 | */ |
| 457 | lstat() |
| 458 | { |
| 459 | register struct inode *ip; |
| 460 | register struct a { |
| 461 | char *fname; |
| 462 | struct stat *sb; |
| 463 | } *uap; |
| 464 | |
| 465 | uap = (struct a *)u.u_ap; |
| 466 | ip = namei(uchar, 0, 0); |
| 467 | if (ip == NULL) |
| 468 | return; |
| 469 | stat1(ip, uap->sb); |
| 470 | iput(ip); |
| 471 | } |
| 472 | |
| 473 | /* |
| 474 | * The basic routine for fstat and stat: |
| 475 | * get the inode and pass appropriate parts back. |
| 476 | */ |
| 477 | stat1(ip, ub) |
| 478 | register struct inode *ip; |
| 479 | struct stat *ub; |
| 480 | { |
| 481 | struct stat ds; |
| 482 | |
| 483 | IUPDAT(ip, &time.tv_sec, &time.tv_sec, 0); |
| 484 | /* |
| 485 | * Copy from inode table |
| 486 | */ |
| 487 | ds.st_dev = ip->i_dev; |
| 488 | ds.st_ino = ip->i_number; |
| 489 | ds.st_mode = ip->i_mode; |
| 490 | ds.st_nlink = ip->i_nlink; |
| 491 | ds.st_uid = ip->i_uid; |
| 492 | ds.st_gid = ip->i_gid; |
| 493 | ds.st_rdev = (dev_t)ip->i_rdev; |
| 494 | ds.st_size = ip->i_size; |
| 495 | ds.st_atime = ip->i_atime; |
| 496 | ds.st_mtime = ip->i_mtime; |
| 497 | ds.st_ctime = ip->i_ctime; |
| 498 | /* this doesn't belong here */ |
| 499 | if ((ip->i_mode&IFMT) == IFBLK) |
| 500 | ds.st_blksize = BLKDEV_IOSIZE; |
| 501 | else if ((ip->i_mode&IFMT) == IFCHR) |
| 502 | ds.st_blksize = MAXBSIZE; |
| 503 | else |
| 504 | ds.st_blksize = ip->i_fs->fs_bsize; |
| 505 | if (copyout((caddr_t)&ds, (caddr_t)ub, sizeof(ds)) < 0) |
| 506 | u.u_error = EFAULT; |
| 507 | } |
| 508 | |
| 509 | /* |
| 510 | * Return target name of a symbolic link |
| 511 | */ |
| 512 | readlink() |
| 513 | { |
| 514 | register struct inode *ip; |
| 515 | register struct a { |
| 516 | char *name; |
| 517 | char *buf; |
| 518 | int count; |
| 519 | } *uap = (struct a *)u.u_ap; |
| 520 | int resid; |
| 521 | |
| 522 | ip = namei(uchar, 0, 0); |
| 523 | if (ip == NULL) |
| 524 | return; |
| 525 | if ((ip->i_mode&IFMT) != IFLNK) { |
| 526 | u.u_error = ENXIO; |
| 527 | goto out; |
| 528 | } |
| 529 | u.u_error = rdwri(UIO_READ, ip, uap->buf, uap->count, 0, 0, &resid); |
| 530 | out: |
| 531 | iput(ip); |
| 532 | u.u_r.r_val1 = uap->count - resid; |
| 533 | } |
| 534 | |
| 535 | chmod() |
| 536 | { |
| 537 | struct inode *ip; |
| 538 | struct a { |
| 539 | char *fname; |
| 540 | int fmode; |
| 541 | } *uap; |
| 542 | |
| 543 | uap = (struct a *)u.u_ap; |
| 544 | if ((ip = owner(1)) == NULL) |
| 545 | return; |
| 546 | chmod1(ip, uap->fmode); |
| 547 | } |
| 548 | |
| 549 | fchmod() |
| 550 | { |
| 551 | struct a { |
| 552 | int fd; |
| 553 | int fmode; |
| 554 | } *uap; |
| 555 | register struct inode *ip; |
| 556 | register struct file *fp; |
| 557 | |
| 558 | uap = (struct a *)u.u_ap; |
| 559 | fp = getf(uap->fd); |
| 560 | if (fp == NULL) |
| 561 | return; |
| 562 | if (fp->f_type == DTYPE_SOCKET) { |
| 563 | u.u_error = EINVAL; |
| 564 | return; |
| 565 | } |
| 566 | ip = fp->f_inode; |
| 567 | ilock(ip); |
| 568 | if (u.u_uid != ip->i_uid && !suser()) { |
| 569 | iunlock(ip); |
| 570 | return; |
| 571 | } |
| 572 | chmod1(ip, uap->fmode); |
| 573 | } |
| 574 | |
| 575 | chmod1(ip, mode) |
| 576 | register struct inode *ip; |
| 577 | register int mode; |
| 578 | { |
| 579 | register int *gp; |
| 580 | |
| 581 | ip->i_mode &= ~07777; |
| 582 | if (u.u_uid) { |
| 583 | mode &= ~ISVTX; |
| 584 | for (gp = u.u_groups; gp < &u.u_groups[NGROUPS]; gp++) |
| 585 | if (*gp == ip->i_gid) |
| 586 | goto ok; |
| 587 | mode &= ~ISGID; |
| 588 | ok: |
| 589 | ; |
| 590 | #ifdef MUSH |
| 591 | if (u.u_quota->q_syflags & QF_UMASK && u.u_uid != 0 && |
| 592 | (ip->i_mode & IFMT) != IFCHR) |
| 593 | mode &= ~u.u_cmask; |
| 594 | #endif |
| 595 | } |
| 596 | ip->i_mode |= mode&07777; |
| 597 | ip->i_flag |= ICHG; |
| 598 | if (ip->i_flag&ITEXT && (ip->i_mode&ISVTX)==0) |
| 599 | xrele(ip); |
| 600 | iput(ip); |
| 601 | } |
| 602 | |
| 603 | chown() |
| 604 | { |
| 605 | struct inode *ip; |
| 606 | struct a { |
| 607 | char *fname; |
| 608 | int uid; |
| 609 | int gid; |
| 610 | } *uap; |
| 611 | |
| 612 | uap = (struct a *)u.u_ap; |
| 613 | if (!suser() || (ip = owner(0)) == NULL) |
| 614 | return; |
| 615 | chown1(ip, uap->uid, uap->gid); |
| 616 | } |
| 617 | |
| 618 | fchown() |
| 619 | { |
| 620 | struct a { |
| 621 | int fd; |
| 622 | int uid; |
| 623 | int gid; |
| 624 | } *uap; |
| 625 | register struct inode *ip; |
| 626 | register struct file *fp; |
| 627 | |
| 628 | uap = (struct a *)u.u_ap; |
| 629 | fp = getf(uap->fd); |
| 630 | if (fp == NULL) |
| 631 | return; |
| 632 | if (fp->f_type == DTYPE_SOCKET) { |
| 633 | u.u_error = EINVAL; |
| 634 | return; |
| 635 | } |
| 636 | ip = fp->f_inode; |
| 637 | ilock(ip); |
| 638 | if (!suser()) { |
| 639 | iunlock(ip); |
| 640 | return; |
| 641 | } |
| 642 | chown1(ip, uap->uid, uap->gid); |
| 643 | } |
| 644 | |
| 645 | /* |
| 646 | * Perform chown operation on inode ip; |
| 647 | * inode must be locked prior to call. |
| 648 | */ |
| 649 | chown1(ip, uid, gid) |
| 650 | register struct inode *ip; |
| 651 | int uid, gid; |
| 652 | { |
| 653 | #ifdef QUOTA |
| 654 | register long change; |
| 655 | |
| 656 | /* |
| 657 | * This doesn't allow for holes in files (which hopefully don't |
| 658 | * happen often in files that we chown), and is not accurate anyway |
| 659 | * (eg: it totally ignores 3 level indir blk files - but hopefully |
| 660 | * noone who can make a file that big will have a quota) |
| 661 | */ |
| 662 | if (ip->i_uid == uid) |
| 663 | change = 0; |
| 664 | else { |
| 665 | register struct fs *fs = ip->i_fs; |
| 666 | |
| 667 | if (ip->i_size > (change = NDADDR * fs->fs_bsize)) { |
| 668 | register off_t size; |
| 669 | |
| 670 | size = blkroundup(fs, ip->i_size) - change; |
| 671 | change += size; |
| 672 | change += fs->fs_bsize; |
| 673 | /* this assumes NIADDR <= 2 */ |
| 674 | if (size > NINDIR(fs) * fs->fs_bsize) |
| 675 | change += fs->fs_bsize; |
| 676 | } else |
| 677 | change = fragroundup(fs, ip->i_size); |
| 678 | change /= DEV_BSIZE; |
| 679 | } |
| 680 | chkdq(ip, -change, 1); |
| 681 | chkiq(ip->i_dev, ip, ip->i_uid, 1); |
| 682 | dqrele(ip->i_dquot); |
| 683 | #endif |
| 684 | /* |
| 685 | * keep uid/gid's in sane range -- no err, |
| 686 | * so chown(file, uid, -1) will do something useful |
| 687 | */ |
| 688 | if (uid >= 0 && uid <= 32767) /* should have a constant */ |
| 689 | ip->i_uid = uid; |
| 690 | if (gid >= 0 && gid <= 32767) /* same here */ |
| 691 | ip->i_gid = gid; |
| 692 | ip->i_flag |= ICHG; |
| 693 | if (u.u_ruid != 0) |
| 694 | ip->i_mode &= ~(ISUID|ISGID); |
| 695 | #ifdef QUOTA |
| 696 | ip->i_dquot = inoquota(ip); |
| 697 | chkdq(ip, change, 1); |
| 698 | chkiq(ip->i_dev, NULL, uid, 1); |
| 699 | #endif |
| 700 | iput(ip); |
| 701 | } |
| 702 | |
| 703 | /* |
| 704 | * Set IUPD and IACC times on file. |
| 705 | * Can't set ICHG. |
| 706 | */ |
| 707 | outime() |
| 708 | { |
| 709 | register struct a { |
| 710 | char *fname; |
| 711 | time_t *tptr; |
| 712 | } *uap; |
| 713 | register struct inode *ip; |
| 714 | time_t tv[2]; |
| 715 | |
| 716 | uap = (struct a *)u.u_ap; |
| 717 | if ((ip = owner(1)) == NULL) |
| 718 | return; |
| 719 | if (copyin((caddr_t)uap->tptr, (caddr_t)tv, sizeof(tv))) { |
| 720 | u.u_error = EFAULT; |
| 721 | } else { |
| 722 | ip->i_flag |= IACC|IUPD|ICHG; |
| 723 | iupdat(ip, &tv[0], &tv[1], 0); |
| 724 | } |
| 725 | iput(ip); |
| 726 | } |
| 727 | |
| 728 | sync() |
| 729 | { |
| 730 | |
| 731 | update(0); |
| 732 | } |
| 733 | |
| 734 | flock() |
| 735 | { |
| 736 | struct a { |
| 737 | int fd; |
| 738 | int how; |
| 739 | } *uap; |
| 740 | register struct file *fp; |
| 741 | register int cmd, flags; |
| 742 | |
| 743 | uap = (struct a *)u.u_ap; |
| 744 | fp = getf(uap->fd); |
| 745 | if (fp == NULL) |
| 746 | return; |
| 747 | if (fp->f_type == DTYPE_SOCKET) { /* XXX */ |
| 748 | u.u_error = EINVAL; |
| 749 | return; |
| 750 | } |
| 751 | cmd = uap->how; |
| 752 | flags = u.u_pofile[uap->fd] & (RDLOCK|WRLOCK); |
| 753 | if (cmd&FUNLOCK) { |
| 754 | if (flags == 0) { |
| 755 | u.u_error = EINVAL; |
| 756 | return; |
| 757 | } |
| 758 | funlocki(fp->f_inode, flags); |
| 759 | u.u_pofile[uap->fd] &= ~(RDLOCK|WRLOCK); |
| 760 | return; |
| 761 | } |
| 762 | /* |
| 763 | * No reason to write lock a file we've already |
| 764 | * write locked, similarly with a read lock. |
| 765 | */ |
| 766 | if ((flags&WRLOCK) && (cmd&FWRLOCK) || |
| 767 | (flags&RDLOCK) && (cmd&FRDLOCK)) |
| 768 | return; |
| 769 | u.u_pofile[uap->fd] = flocki(fp->f_inode, u.u_pofile[uap->fd], cmd); |
| 770 | } |
| 771 | |
| 772 | truncate() |
| 773 | { |
| 774 | struct a { |
| 775 | char *fname; |
| 776 | int length; |
| 777 | } *uap = (struct a *)u.u_ap; |
| 778 | struct inode *ip; |
| 779 | |
| 780 | ip = namei(uchar, 0, 1); |
| 781 | if (ip == NULL) |
| 782 | return; |
| 783 | if (access(ip, IWRITE)) |
| 784 | goto bad; |
| 785 | if ((ip->i_mode&IFMT) == IFDIR) { |
| 786 | u.u_error = EISDIR; |
| 787 | goto bad; |
| 788 | } |
| 789 | itrunc(ip, uap->length); |
| 790 | return; |
| 791 | bad: |
| 792 | iput(ip); |
| 793 | } |
| 794 | |
| 795 | ftruncate() |
| 796 | { |
| 797 | struct a { |
| 798 | int fd; |
| 799 | int length; |
| 800 | } *uap = (struct a *)u.u_ap; |
| 801 | struct inode *ip; |
| 802 | struct file *fp; |
| 803 | |
| 804 | fp = getf(uap->fd); |
| 805 | if (fp == NULL) |
| 806 | return; |
| 807 | if (fp->f_type == DTYPE_SOCKET) { |
| 808 | u.u_error = EINVAL; |
| 809 | return; |
| 810 | } |
| 811 | if ((fp->f_flag&FWRITE) == 0) { |
| 812 | u.u_error = EINVAL; |
| 813 | return; |
| 814 | } |
| 815 | ip = fp->f_inode; |
| 816 | ilock(ip); |
| 817 | itrunc(ip, uap->length); |
| 818 | } |
| 819 | |
| 820 | rename() |
| 821 | { |
| 822 | #ifdef notdef |
| 823 | struct a { |
| 824 | char *from; |
| 825 | char *to; |
| 826 | } *uap; |
| 827 | #endif |
| 828 | |
| 829 | } |
| 830 | |
| 831 | /* |
| 832 | * Make a new file. |
| 833 | */ |
| 834 | struct inode * |
| 835 | maknode(mode) |
| 836 | int mode; |
| 837 | { |
| 838 | register struct inode *ip; |
| 839 | ino_t ipref; |
| 840 | |
| 841 | if ((mode & IFMT) == IFDIR) |
| 842 | ipref = dirpref(u.u_pdir->i_fs); |
| 843 | else |
| 844 | ipref = u.u_pdir->i_number; |
| 845 | ip = ialloc(u.u_pdir, ipref, mode); |
| 846 | if (ip == NULL) { |
| 847 | iput(u.u_pdir); |
| 848 | return (NULL); |
| 849 | } |
| 850 | #ifdef QUOTA |
| 851 | if (ip->i_dquot != NODQUOT) |
| 852 | panic("maknode: dquot"); |
| 853 | #endif |
| 854 | ip->i_flag |= IACC|IUPD|ICHG; |
| 855 | if ((mode & IFMT) == 0) |
| 856 | mode |= IFREG; |
| 857 | ip->i_mode = mode & ~u.u_cmask; |
| 858 | ip->i_nlink = 1; |
| 859 | ip->i_uid = u.u_uid; |
| 860 | ip->i_gid = u.u_pdir->i_gid; |
| 861 | #ifdef QUOTA |
| 862 | ip->i_dquot = inoquota(ip); |
| 863 | #endif |
| 864 | |
| 865 | /* |
| 866 | * Make sure inode goes to disk before directory entry. |
| 867 | */ |
| 868 | iupdat(ip, &time.tv_sec, &time.tv_sec, 1); |
| 869 | direnter(ip); |
| 870 | if (u.u_error) { |
| 871 | /* |
| 872 | * write error occurred trying to update directory |
| 873 | * so must deallocate the inode |
| 874 | */ |
| 875 | ip->i_nlink = 0; |
| 876 | ip->i_flag |= ICHG; |
| 877 | iput(ip); |
| 878 | return (NULL); |
| 879 | } |
| 880 | return (ip); |
| 881 | } |