| 1 | #include <u.h> |
| 2 | #include <libc.h> |
| 3 | #include <ureg.h> |
| 4 | #include "dat.h" |
| 5 | #include "fns.h" |
| 6 | #include "linux.h" |
| 7 | |
| 8 | typedef struct Rfile Rfile; |
| 9 | typedef struct Rpath Rpath; |
| 10 | |
| 11 | struct Rfile |
| 12 | { |
| 13 | Ufile; |
| 14 | struct |
| 15 | { |
| 16 | Dir *d; |
| 17 | int i; |
| 18 | int n; |
| 19 | } diraux; |
| 20 | }; |
| 21 | |
| 22 | struct Rpath |
| 23 | { |
| 24 | Ref; |
| 25 | |
| 26 | Rpath *hash; |
| 27 | |
| 28 | int deleted; |
| 29 | char str[]; |
| 30 | }; |
| 31 | |
| 32 | static Rpath *rpathtab[64]; |
| 33 | static QLock rpathtablk; |
| 34 | |
| 35 | static Rpath ** |
| 36 | rpathent(char *path) |
| 37 | { |
| 38 | Rpath **prp; |
| 39 | |
| 40 | prp = &rpathtab[hashpath(path) % nelem(rpathtab)]; |
| 41 | while(*prp){ |
| 42 | if(strcmp(path, (*prp)->str) == 0) |
| 43 | break; |
| 44 | prp = &((*prp)->hash); |
| 45 | } |
| 46 | return prp; |
| 47 | } |
| 48 | |
| 49 | static char* |
| 50 | linkname(char *name) |
| 51 | { |
| 52 | if(strncmp(name, ".udir.L.", 8) == 0) |
| 53 | name += 8; |
| 54 | return name; |
| 55 | } |
| 56 | |
| 57 | static char* |
| 58 | udirpath(char *base, char *name, char type) |
| 59 | { |
| 60 | char buf[9]; |
| 61 | |
| 62 | strcpy(buf, ".udir.T."); |
| 63 | buf[6] = type; |
| 64 | return allocpath(base, buf, name); |
| 65 | } |
| 66 | |
| 67 | static int |
| 68 | udirget(char *base, char *name, char type, char **val) |
| 69 | { |
| 70 | char *f, *b; |
| 71 | int n, r, s; |
| 72 | int fd; |
| 73 | |
| 74 | r = -1; |
| 75 | f = udirpath(base, name, type); |
| 76 | if((fd = open(shortpath(current->kcwd, f), OREAD)) < 0) |
| 77 | goto out; |
| 78 | if(val == nil){ |
| 79 | r = 0; |
| 80 | goto out; |
| 81 | } |
| 82 | if((s = seek(fd, 0, 2)) < 0) |
| 83 | goto out; |
| 84 | b = kmalloc(s+1); |
| 85 | n = 0; |
| 86 | if(s > 0){ |
| 87 | seek(fd, 0, 0); |
| 88 | if((n = read(fd, b, s)) < 0){ |
| 89 | free(b); |
| 90 | goto out; |
| 91 | } |
| 92 | } |
| 93 | b[n] = 0; |
| 94 | |
| 95 | r = 0; |
| 96 | *val = b; |
| 97 | out: |
| 98 | free(f); |
| 99 | close(fd); |
| 100 | return r; |
| 101 | } |
| 102 | |
| 103 | static char* |
| 104 | resolvepath1(char *path, int link) |
| 105 | { |
| 106 | char *r, *b, *p, *o, *e; |
| 107 | char **a; |
| 108 | |
| 109 | int n; |
| 110 | int i; |
| 111 | |
| 112 | r = nil; |
| 113 | a = nil; |
| 114 | n = 0; |
| 115 | |
| 116 | b = kstrdup(path); |
| 117 | for(p=b; *p; p++){ |
| 118 | if(*p == '/'){ |
| 119 | if((n % 16) == 0) |
| 120 | a = krealloc(a, sizeof(a[0]) * (n+16)); |
| 121 | a[n++] = p; |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | e = nil; |
| 126 | for(i=n-1; i>=0; i--){ |
| 127 | char *t; |
| 128 | char *f; |
| 129 | |
| 130 | o = e; |
| 131 | e = a[i]; |
| 132 | *e++ = 0; |
| 133 | |
| 134 | f = linkname(e); |
| 135 | t = nil; |
| 136 | |
| 137 | if(!udirget(b, f, 'L', &t)){ |
| 138 | if(t == nil) |
| 139 | break; |
| 140 | if(link && o==nil){ |
| 141 | free(t); |
| 142 | if(f != e) |
| 143 | break; |
| 144 | t = udirpath(b, e, 'L'); |
| 145 | } |
| 146 | r = fullpath(b, t); |
| 147 | free(t); |
| 148 | if(o && o[1]){ |
| 149 | t = r; |
| 150 | r = fullpath(t, &o[1]); |
| 151 | free(t); |
| 152 | } |
| 153 | break; |
| 154 | } |
| 155 | |
| 156 | --e; |
| 157 | if(o) *o = '/'; |
| 158 | } |
| 159 | free(b); |
| 160 | free(a); |
| 161 | |
| 162 | return r; |
| 163 | } |
| 164 | |
| 165 | static char * |
| 166 | resolvepath(char *path, int link) |
| 167 | { |
| 168 | char *t; |
| 169 | int x; |
| 170 | |
| 171 | x = 0; |
| 172 | path = kstrdup(path); |
| 173 | while(t = resolvepath1(path, link)){ |
| 174 | if(++x > 8){ |
| 175 | free(t); |
| 176 | free(path); |
| 177 | return nil; |
| 178 | } |
| 179 | free(path); path = t; |
| 180 | } |
| 181 | return path; |
| 182 | } |
| 183 | |
| 184 | static int |
| 185 | ropen(char *path, int mode, int perm, Ufile **pf) |
| 186 | { |
| 187 | Ufile *f; |
| 188 | int err; |
| 189 | char *s, *t; |
| 190 | int mode9, perm9; |
| 191 | int fd; |
| 192 | char *base; |
| 193 | char *name; |
| 194 | Rpath **prp; |
| 195 | |
| 196 | trace("ropen(%s, %#o, %#o, ...)", path, mode, perm); |
| 197 | |
| 198 | base = nil; |
| 199 | name = nil; |
| 200 | mode9 = mode & 3; |
| 201 | perm9 = (perm & ~current->umask) & 0777; |
| 202 | |
| 203 | s = shortpath(current->kcwd, path); |
| 204 | |
| 205 | if(mode & O_CREAT) { |
| 206 | Dir *d; |
| 207 | |
| 208 | err = -EINVAL; |
| 209 | if((base = basepath(path, &name)) == nil) |
| 210 | goto out; |
| 211 | |
| 212 | /* resolve base directory */ |
| 213 | if((d = dirstat(shortpath(current->kcwd, base))) == nil){ |
| 214 | err = mkerror(); |
| 215 | if(t = resolvepath1(base, 0)){ |
| 216 | free(base); base = t; |
| 217 | t = allocpath(t, nil, name); |
| 218 | err = fsopen(t, mode, perm, pf); |
| 219 | free(t); |
| 220 | } |
| 221 | goto out; |
| 222 | } |
| 223 | err = -ENOTDIR; |
| 224 | if((d->mode & DMDIR) == 0){ |
| 225 | free(d); |
| 226 | goto out; |
| 227 | } |
| 228 | free(d); |
| 229 | |
| 230 | /* check if here is a symlink in the way */ |
| 231 | t = udirpath(base, name, 'L'); |
| 232 | if((fd = open(shortpath(current->kcwd, t), OREAD)) >= 0){ |
| 233 | free(t); |
| 234 | close(fd); |
| 235 | |
| 236 | if(mode & O_EXCL){ |
| 237 | err = -EEXIST; |
| 238 | goto out; |
| 239 | } |
| 240 | |
| 241 | if((t = resolvepath1(path, 0)) == nil) |
| 242 | goto out; |
| 243 | err = fsopen(t, mode, perm, pf); |
| 244 | free(t); |
| 245 | goto out; |
| 246 | } |
| 247 | free(t); |
| 248 | |
| 249 | if(mode & (O_EXCL | O_TRUNC)){ |
| 250 | if(mode & O_EXCL) |
| 251 | mode9 |= OEXCL; |
| 252 | fd = create(s, mode9, perm9); |
| 253 | } else { |
| 254 | /* try open first to avoid truncating existing the file */ |
| 255 | if((fd = open(s, mode9)) < 0) |
| 256 | fd = create(s, mode9, perm9); |
| 257 | } |
| 258 | if(fd < 0){ |
| 259 | err = mkerror(); |
| 260 | goto out; |
| 261 | } |
| 262 | } else { |
| 263 | if(((mode & 3) == O_RDWR) || ((mode & 3) == O_WRONLY)) |
| 264 | if(mode & O_TRUNC) |
| 265 | mode9 |= OTRUNC; |
| 266 | |
| 267 | if((fd = open(s, mode9)) < 0){ |
| 268 | err = mkerror(); |
| 269 | if(t = resolvepath1(path, 0)){ |
| 270 | err = fsopen(t, mode, perm, pf); |
| 271 | free(t); |
| 272 | } |
| 273 | goto out; |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | qlock(&rpathtablk); |
| 278 | prp = rpathent(path); |
| 279 | if(*prp != nil){ |
| 280 | incref(*prp); |
| 281 | } else { |
| 282 | Rpath *rp; |
| 283 | |
| 284 | rp = kmalloc(sizeof(*rp) + strlen(path) + 1); |
| 285 | rp->ref = 1; |
| 286 | rp->hash = nil; |
| 287 | rp->deleted = 0; |
| 288 | strcpy(rp->str, path); |
| 289 | *prp = rp; |
| 290 | } |
| 291 | qunlock(&rpathtablk); |
| 292 | |
| 293 | f = kmallocz(sizeof(Rfile), 1); |
| 294 | f->ref = 1; |
| 295 | f->path = kstrdup(path); |
| 296 | f->dev = ROOTDEV; |
| 297 | f->mode = mode; |
| 298 | f->fd = fd; |
| 299 | f->off = 0; |
| 300 | *pf = f; |
| 301 | |
| 302 | err = 0; |
| 303 | |
| 304 | out: |
| 305 | free(base); |
| 306 | free(name); |
| 307 | |
| 308 | return err; |
| 309 | } |
| 310 | |
| 311 | static int |
| 312 | rclose(Ufile *f) |
| 313 | { |
| 314 | Rpath **prp; |
| 315 | Rfile *file = (Rfile*)f; |
| 316 | static char path[1024]; /* protected by rpathtablk */ |
| 317 | |
| 318 | qlock(&rpathtablk); |
| 319 | prp = rpathent(file->path); |
| 320 | if(!decref(*prp)){ |
| 321 | Rpath *rp = *prp; |
| 322 | *prp = rp->hash; |
| 323 | if(rp->deleted){ |
| 324 | if(fd2path(file->fd, path, sizeof(path)) == 0) |
| 325 | remove(shortpath(current->kcwd, path)); |
| 326 | } |
| 327 | free(rp); |
| 328 | } |
| 329 | qunlock(&rpathtablk); |
| 330 | |
| 331 | close(file->fd); |
| 332 | return 0; |
| 333 | } |
| 334 | |
| 335 | static int |
| 336 | rread(Ufile *f, void *buf, int len, vlong off) |
| 337 | { |
| 338 | Rfile *file = (Rfile*)f; |
| 339 | int ret, n; |
| 340 | |
| 341 | n = ret = 0; |
| 342 | if(notifyme(1)) |
| 343 | return -ERESTART; |
| 344 | while((n < len) && ((ret = pread(file->fd, (uchar*)buf + n, len - n, off + n)) > 0)) |
| 345 | n += ret; |
| 346 | notifyme(0); |
| 347 | if(ret < 0) |
| 348 | return mkerror(); |
| 349 | return n; |
| 350 | } |
| 351 | |
| 352 | static int |
| 353 | rwrite(Ufile *f, void *buf, int len, vlong off) |
| 354 | { |
| 355 | Rfile *file = (Rfile*)f; |
| 356 | int ret; |
| 357 | |
| 358 | if(notifyme(1)) |
| 359 | return -ERESTART; |
| 360 | ret = pwrite(file->fd, buf, len, off); |
| 361 | notifyme(0); |
| 362 | if(ret < 0) |
| 363 | ret = mkerror(); |
| 364 | return ret; |
| 365 | } |
| 366 | |
| 367 | static vlong |
| 368 | rsize(Ufile *f) |
| 369 | { |
| 370 | Rfile *file = (Rfile*)f; |
| 371 | |
| 372 | return seek(file->fd, 0, 2); |
| 373 | } |
| 374 | |
| 375 | static int |
| 376 | raccess(char *path, int mode) |
| 377 | { |
| 378 | static char omode[] = { |
| 379 | 0, // --- |
| 380 | OEXEC, // --x |
| 381 | OWRITE, // -w- |
| 382 | ORDWR, // -wx |
| 383 | OREAD, // r-- |
| 384 | OEXEC, // r-x |
| 385 | ORDWR, // rw- |
| 386 | ORDWR // rwx |
| 387 | }; |
| 388 | |
| 389 | int err; |
| 390 | int fd; |
| 391 | Dir *d; |
| 392 | char *s; |
| 393 | |
| 394 | err = -EINVAL; |
| 395 | if(mode & ~07) |
| 396 | return err; |
| 397 | |
| 398 | s = shortpath(current->kcwd, path); |
| 399 | if((d = dirstat(s)) == nil){ |
| 400 | err = mkerror(); |
| 401 | if(path = resolvepath1(path, 0)){ |
| 402 | err = fsaccess(path, mode); |
| 403 | free(path); |
| 404 | } |
| 405 | goto out; |
| 406 | } |
| 407 | |
| 408 | /* ignore the exec bit... firefox gets confused */ |
| 409 | mode &= ~01; |
| 410 | if((mode == 0) || (d->mode & DMDIR)){ |
| 411 | err = 0; |
| 412 | } else { |
| 413 | err = -EACCES; |
| 414 | if((mode & 01) && ((d->mode & 0111) == 0)) |
| 415 | goto out; |
| 416 | if((mode & 02) && ((d->mode & 0222) == 0)) |
| 417 | goto out; |
| 418 | if((mode & 04) && ((d->mode & 0444) == 0)) |
| 419 | goto out; |
| 420 | if((fd = open(s, omode[mode])) >= 0){ |
| 421 | close(fd); |
| 422 | err = 0; |
| 423 | } |
| 424 | } |
| 425 | out: |
| 426 | free(d); |
| 427 | return err; |
| 428 | } |
| 429 | |
| 430 | static ulong |
| 431 | dir2statmode(Dir *d) |
| 432 | { |
| 433 | ulong mode; |
| 434 | |
| 435 | mode = d->mode & 0777; |
| 436 | if(d->mode & DMDIR) |
| 437 | mode |= S_IFDIR; |
| 438 | else if(strcmp(d->name, "cons") == 0) |
| 439 | mode |= S_IFCHR; |
| 440 | else if(strncmp(d->name, "PTS.", 4) == 0) |
| 441 | mode |= S_IFCHR; |
| 442 | else if(strcmp(d->name, "zero") == 0) |
| 443 | mode |= S_IFCHR | 0222; |
| 444 | else if(strcmp(d->name, "null") == 0) |
| 445 | mode |= S_IFCHR | 0222; |
| 446 | else if(strncmp(d->name, ".udir.", 6) == 0){ |
| 447 | switch(d->name[6]){ |
| 448 | case 'L': |
| 449 | mode |= S_IFLNK; |
| 450 | break; |
| 451 | case 'S': |
| 452 | mode |= S_IFSOCK; |
| 453 | break; |
| 454 | case 'F': |
| 455 | mode |= S_IFIFO; |
| 456 | break; |
| 457 | case 'C': |
| 458 | mode |= S_IFCHR; |
| 459 | break; |
| 460 | case 'B': |
| 461 | mode |= S_IFBLK; |
| 462 | break; |
| 463 | } |
| 464 | } else if(d->type == '|') |
| 465 | mode |= S_IFIFO; |
| 466 | else if(d->type == 'H') |
| 467 | mode |= S_IFBLK; |
| 468 | else |
| 469 | mode |= S_IFREG; |
| 470 | |
| 471 | return mode; |
| 472 | } |
| 473 | |
| 474 | static void |
| 475 | dir2ustat(Dir *d, Ustat *s) |
| 476 | { |
| 477 | s->mode = dir2statmode(d); |
| 478 | s->uid = current->uid; |
| 479 | s->gid = current->gid; |
| 480 | s->size = d->length; |
| 481 | s->atime = d->atime; |
| 482 | s->mtime = d->mtime; |
| 483 | s->ctime = d->mtime; |
| 484 | s->ino = 0; // use d->qid? |
| 485 | s->dev = 0; |
| 486 | s->rdev = 0; |
| 487 | } |
| 488 | |
| 489 | static int |
| 490 | rstat(char *path, int link, Ustat *s) |
| 491 | { |
| 492 | Dir *d; |
| 493 | int err; |
| 494 | char *t; |
| 495 | |
| 496 | if((d = dirstat(shortpath(current->kcwd, path))) == nil){ |
| 497 | if(link){ |
| 498 | char *base; |
| 499 | char *name; |
| 500 | if(base = basepath(path, &name)){ |
| 501 | t = udirpath(base, name, 'L'); |
| 502 | free(name); |
| 503 | free(base); |
| 504 | d = dirstat(shortpath(current->kcwd, t)); |
| 505 | free(t); |
| 506 | } |
| 507 | |
| 508 | } |
| 509 | } |
| 510 | if(d == nil){ |
| 511 | err = mkerror(); |
| 512 | if(t = resolvepath1(path, 0)){ |
| 513 | err = fsstat(t, link, s); |
| 514 | free(t); |
| 515 | } |
| 516 | return err; |
| 517 | } |
| 518 | |
| 519 | dir2ustat(d, s); |
| 520 | s->ino = hashpath(path); |
| 521 | |
| 522 | free(d); |
| 523 | return 0; |
| 524 | } |
| 525 | |
| 526 | static int |
| 527 | rfstat(Ufile *f, Ustat *s) |
| 528 | { |
| 529 | Dir *d; |
| 530 | |
| 531 | if((d = dirfstat(f->fd)) == nil) |
| 532 | return mkerror(); |
| 533 | |
| 534 | dir2ustat(d, s); |
| 535 | s->ino = hashpath(f->path); |
| 536 | |
| 537 | free(d); |
| 538 | return 0; |
| 539 | } |
| 540 | |
| 541 | static char* |
| 542 | fixname(char *name) |
| 543 | { |
| 544 | if(name == nil) |
| 545 | return nil; |
| 546 | if(strncmp(name, ".udir.", 6) == 0){ |
| 547 | if(name[6] && name[7]=='.') |
| 548 | name += 8; |
| 549 | } |
| 550 | return name; |
| 551 | } |
| 552 | |
| 553 | static int |
| 554 | rreaddir(Ufile *f, Udirent **pd) |
| 555 | { |
| 556 | Dir *d; |
| 557 | int i, n; |
| 558 | |
| 559 | seek(f->fd, 0, 0); |
| 560 | n = dirreadall(f->fd, &d); |
| 561 | if(n < 0) |
| 562 | return mkerror(); |
| 563 | for(i=0; i<n; i++){ |
| 564 | if((*pd = newdirent(f->path, fixname(d[i].name), dir2statmode(&d[i]))) == nil) |
| 565 | break; |
| 566 | pd = &((*pd)->next); |
| 567 | } |
| 568 | free(d); |
| 569 | return i; |
| 570 | } |
| 571 | |
| 572 | static int |
| 573 | rreadlink(char *path, char *buf, int len) |
| 574 | { |
| 575 | int err; |
| 576 | int fd; |
| 577 | |
| 578 | char *t; |
| 579 | char *name; |
| 580 | char *base; |
| 581 | |
| 582 | trace("rreadlink(%s)", path); |
| 583 | |
| 584 | if((base = basepath(path, &name)) == nil) |
| 585 | return -EINVAL; |
| 586 | |
| 587 | /* resolve base path */ |
| 588 | if((fd = open(shortpath(current->kcwd, base), OREAD)) < 0){ |
| 589 | err = mkerror(); |
| 590 | if(t = resolvepath1(base, 0)){ |
| 591 | free(base); base = t; |
| 592 | t = allocpath(base, nil, name); |
| 593 | err = fsreadlink(t, buf, len); |
| 594 | free(t); |
| 595 | } |
| 596 | goto out; |
| 597 | } |
| 598 | close(fd); |
| 599 | |
| 600 | /* check if path is regular file */ |
| 601 | if((fd = open(shortpath(current->kcwd, path), OREAD)) >= 0){ |
| 602 | close(fd); |
| 603 | err = -EINVAL; |
| 604 | goto out; |
| 605 | } |
| 606 | |
| 607 | t = udirpath(base, name, 'L'); |
| 608 | if((fd = open(shortpath(current->kcwd, t), OREAD)) < 0){ |
| 609 | err = mkerror(); |
| 610 | free(t); |
| 611 | goto out; |
| 612 | } |
| 613 | free(t); |
| 614 | if((err = read(fd, buf, len)) < 0) |
| 615 | err = mkerror(); |
| 616 | close(fd); |
| 617 | out: |
| 618 | free(base); |
| 619 | free(name); |
| 620 | return err; |
| 621 | } |
| 622 | |
| 623 | enum { |
| 624 | COPYSIZE = 8*1024, |
| 625 | }; |
| 626 | |
| 627 | static int |
| 628 | copyfile(char *from, char *to) |
| 629 | { |
| 630 | int err, fromfd, tofd; |
| 631 | char *buf, *s; |
| 632 | Dir *ent; |
| 633 | Dir *dir; |
| 634 | |
| 635 | dir = nil; |
| 636 | buf = nil; |
| 637 | ent = nil; |
| 638 | |
| 639 | tofd = -1; |
| 640 | |
| 641 | trace("copyfile(%s, %s)", from, to); |
| 642 | |
| 643 | if((fromfd = open(shortpath(current->kcwd, from), OREAD)) < 0){ |
| 644 | err = mkerror(); |
| 645 | goto out; |
| 646 | } |
| 647 | if((dir = dirfstat(fromfd)) == nil){ |
| 648 | err = mkerror(); |
| 649 | goto out; |
| 650 | } |
| 651 | s = shortpath(current->kcwd, to); |
| 652 | if((err = open(s, OREAD)) >= 0){ |
| 653 | close(err); |
| 654 | err = -EEXIST; |
| 655 | goto out; |
| 656 | } |
| 657 | if(dir->mode & DMDIR){ |
| 658 | int n; |
| 659 | if((tofd = create(s, OREAD, dir->mode)) < 0){ |
| 660 | err = mkerror(); |
| 661 | goto out; |
| 662 | } |
| 663 | close(tofd); |
| 664 | tofd = -1; |
| 665 | while((n = dirread(fromfd, &ent)) > 0){ |
| 666 | int i; |
| 667 | |
| 668 | for(i=0; i<n; i++){ |
| 669 | char *froment, *toent; |
| 670 | |
| 671 | froment = allocpath(from, nil, ent[i].name); |
| 672 | toent = allocpath(to, nil, ent[i].name); |
| 673 | err = copyfile(froment, toent); |
| 674 | free(froment); |
| 675 | free(toent); |
| 676 | |
| 677 | if(err < 0) |
| 678 | goto out; |
| 679 | } |
| 680 | free(ent); ent = nil; |
| 681 | } |
| 682 | } else { |
| 683 | if((tofd = create(s, OWRITE, dir->mode)) < 0){ |
| 684 | err = mkerror(); |
| 685 | goto out; |
| 686 | } |
| 687 | buf = kmalloc(COPYSIZE); |
| 688 | for(;;){ |
| 689 | err = read(fromfd, buf, COPYSIZE); |
| 690 | if(err == 0) |
| 691 | break; |
| 692 | if(err < 0){ |
| 693 | err = mkerror(); |
| 694 | goto out; |
| 695 | } |
| 696 | if(write(tofd, buf, err) != err){ |
| 697 | err = mkerror(); |
| 698 | goto out; |
| 699 | } |
| 700 | } |
| 701 | } |
| 702 | |
| 703 | err = 0; |
| 704 | out: |
| 705 | free(ent); |
| 706 | free(dir); |
| 707 | free(buf); |
| 708 | close(fromfd); |
| 709 | close(tofd); |
| 710 | return err; |
| 711 | } |
| 712 | |
| 713 | static int |
| 714 | removefile(char *path) |
| 715 | { |
| 716 | int err; |
| 717 | int n; |
| 718 | Dir *d; |
| 719 | int fd; |
| 720 | char *s; |
| 721 | |
| 722 | trace("removefile(%s)", path); |
| 723 | |
| 724 | s = shortpath(current->kcwd, path); |
| 725 | |
| 726 | if((d = dirstat(s)) == nil) |
| 727 | return mkerror(); |
| 728 | if(remove(s) == 0){ |
| 729 | free(d); |
| 730 | return 0; |
| 731 | } |
| 732 | if((d->mode & DMDIR) == 0){ |
| 733 | free(d); |
| 734 | return mkerror(); |
| 735 | } |
| 736 | free(d); |
| 737 | if((fd = open(s, OREAD)) < 0) |
| 738 | return mkerror(); |
| 739 | err = 0; |
| 740 | d = nil; |
| 741 | while((n = dirread(fd, &d)) > 0){ |
| 742 | char *t; |
| 743 | int i; |
| 744 | |
| 745 | for(i=0; i<n; i++){ |
| 746 | t = allocpath(path, nil, d[i].name); |
| 747 | err = removefile(t); |
| 748 | free(t); |
| 749 | |
| 750 | if(err < 0) |
| 751 | break; |
| 752 | } |
| 753 | free(d); d = nil; |
| 754 | |
| 755 | if(err < 0) |
| 756 | break; |
| 757 | } |
| 758 | close(fd); |
| 759 | if(err < 0) |
| 760 | return err; |
| 761 | if(n < 0) |
| 762 | return mkerror(); |
| 763 | if(remove(s) < 0) |
| 764 | return mkerror(); |
| 765 | return 0; |
| 766 | } |
| 767 | |
| 768 | static int |
| 769 | resolvefromtopath(char **from, char **to) |
| 770 | { |
| 771 | char *t; |
| 772 | |
| 773 | trace("resolvefromtopath(%s, %s)", *from, *to); |
| 774 | |
| 775 | if((*from = resolvepath(*from, 1)) == nil){ |
| 776 | *to = nil; |
| 777 | return -ELOOP; |
| 778 | } |
| 779 | if((*to = resolvepath(*to, 1)) == nil){ |
| 780 | free(*from); |
| 781 | *from = nil; |
| 782 | return -ELOOP; |
| 783 | } |
| 784 | if(strstr(*from, ".udir.L")){ |
| 785 | char *x; |
| 786 | |
| 787 | x = nil; |
| 788 | for(t=*to; *t; t++){ |
| 789 | if(*t == '/') |
| 790 | x = t; |
| 791 | } |
| 792 | |
| 793 | if(strncmp(x+1, ".udir.", 6)){ |
| 794 | *x = 0; |
| 795 | t = udirpath(*to, x+1, 'L'); |
| 796 | free(*to); *to = t; |
| 797 | } |
| 798 | } |
| 799 | |
| 800 | return 0; |
| 801 | } |
| 802 | |
| 803 | static int |
| 804 | rrename(char *from, char *to) |
| 805 | { |
| 806 | int err; |
| 807 | char *x, *y, *t; |
| 808 | |
| 809 | trace("rrename(%s, %s)", from, to); |
| 810 | |
| 811 | if((err = resolvefromtopath(&from, &to)) < 0) |
| 812 | goto out; |
| 813 | if(strcmp(from, to) == 0) |
| 814 | goto out; |
| 815 | x = nil; |
| 816 | for(t=from; *t; t++){ |
| 817 | if(*t == '/') |
| 818 | x = t; |
| 819 | } |
| 820 | y = nil; |
| 821 | for(t=to; *t; t++){ |
| 822 | if(*t == '/') |
| 823 | y = t; |
| 824 | } |
| 825 | if(x && y){ |
| 826 | char *e; |
| 827 | |
| 828 | e = nil; |
| 829 | *x = 0; *y = 0; |
| 830 | if(strcmp(from, to) == 0) |
| 831 | e = &y[1]; |
| 832 | *x = '/'; *y = '/'; |
| 833 | |
| 834 | if(e != nil){ |
| 835 | Dir d; |
| 836 | |
| 837 | nulldir(&d); |
| 838 | d.name = e; |
| 839 | |
| 840 | remove(to); |
| 841 | if(dirwstat(shortpath(current->kcwd, from), &d) < 0) |
| 842 | err = mkerror(); |
| 843 | goto out; |
| 844 | } |
| 845 | } |
| 846 | t = ksmprint("%s%d%d.tmp", to, current->pid, current->tid); |
| 847 | if((err = copyfile(from, t)) == 0){ |
| 848 | Dir d; |
| 849 | |
| 850 | nulldir(&d); |
| 851 | d.name = &y[1]; |
| 852 | |
| 853 | remove(shortpath(current->kcwd, to)); |
| 854 | if(dirwstat(shortpath(current->kcwd, t), &d) < 0) { |
| 855 | err = mkerror(); |
| 856 | } else { |
| 857 | removefile(from); |
| 858 | } |
| 859 | } |
| 860 | if(err != 0) |
| 861 | removefile(t); |
| 862 | free(t); |
| 863 | out: |
| 864 | free(from); |
| 865 | free(to); |
| 866 | |
| 867 | return err; |
| 868 | } |
| 869 | |
| 870 | static int |
| 871 | rmkdir(char *path, int mode) |
| 872 | { |
| 873 | int err; |
| 874 | Dir *d; |
| 875 | int fd; |
| 876 | int mode9; |
| 877 | |
| 878 | char *base; |
| 879 | char *name; |
| 880 | char *t; |
| 881 | |
| 882 | trace("rmkdir(%s, %#o)", path, mode); |
| 883 | |
| 884 | if((base = basepath(path, &name)) == nil) |
| 885 | return -EINVAL; |
| 886 | |
| 887 | if((d = dirstat(shortpath(current->kcwd, base))) == nil){ |
| 888 | err = mkerror(); |
| 889 | if(t = resolvepath1(base, 0)){ |
| 890 | free(base); base = t; |
| 891 | t = allocpath(base, nil, name); |
| 892 | err = fsmkdir(t, mode); |
| 893 | free(t); |
| 894 | } |
| 895 | goto out; |
| 896 | } |
| 897 | err = -ENOTDIR; |
| 898 | if((d->mode & DMDIR) == 0){ |
| 899 | free(d); |
| 900 | goto out; |
| 901 | } |
| 902 | free(d); |
| 903 | |
| 904 | err = -EEXIST; |
| 905 | t = udirpath(base, name, 'L'); |
| 906 | if(d = dirstat(shortpath(current->kcwd, t))){ |
| 907 | free(d); |
| 908 | free(t); |
| 909 | goto out; |
| 910 | } |
| 911 | free(t); |
| 912 | |
| 913 | mode9 = DMDIR | ((mode & ~current->umask) & 0777); |
| 914 | if((fd = create(shortpath(current->kcwd, path), OREAD|OEXCL, mode9)) < 0){ |
| 915 | err = mkerror(); |
| 916 | goto out; |
| 917 | } |
| 918 | close(fd); |
| 919 | err = 0; |
| 920 | |
| 921 | out: |
| 922 | free(name); |
| 923 | free(base); |
| 924 | return err; |
| 925 | } |
| 926 | |
| 927 | static void |
| 928 | combinedir(Dir *ndir, Dir *odir) |
| 929 | { |
| 930 | if(ndir->mode != ~0) |
| 931 | ndir->mode = (odir->mode & ~0777) | (ndir->mode & 0777); |
| 932 | } |
| 933 | |
| 934 | static int |
| 935 | uwstat(char *path, Dir *ndir, int link) |
| 936 | { |
| 937 | int err; |
| 938 | Dir *dir; |
| 939 | char *s; |
| 940 | |
| 941 | trace("uwstat(%s, ..., %d)", path, link); |
| 942 | |
| 943 | s = shortpath(current->kcwd, path); |
| 944 | if((dir = dirstat(s)) == nil){ |
| 945 | err = mkerror(); |
| 946 | if(link){ |
| 947 | char *base; |
| 948 | char *name; |
| 949 | |
| 950 | if(base = basepath(path, &name)){ |
| 951 | char *t; |
| 952 | |
| 953 | t = udirpath(base, name, 'L'); |
| 954 | free(base); |
| 955 | free(name); |
| 956 | |
| 957 | err = uwstat(t, ndir, 0); |
| 958 | free(t); |
| 959 | } |
| 960 | } |
| 961 | return err; |
| 962 | } |
| 963 | combinedir(ndir, dir); |
| 964 | err = 0; |
| 965 | if(dirwstat(s, ndir) < 0) |
| 966 | err = mkerror(); |
| 967 | free(dir); |
| 968 | return err; |
| 969 | } |
| 970 | |
| 971 | static int |
| 972 | uwfstat(Ufile *f, Dir *ndir) |
| 973 | { |
| 974 | int err; |
| 975 | Dir *dir; |
| 976 | |
| 977 | if((dir = dirfstat(f->fd)) == nil){ |
| 978 | err = mkerror(); |
| 979 | goto out; |
| 980 | } |
| 981 | combinedir(ndir, dir); |
| 982 | err = 0; |
| 983 | if(dirfwstat(f->fd, ndir) < 0) |
| 984 | err = mkerror(); |
| 985 | out: |
| 986 | free(dir); |
| 987 | return err; |
| 988 | } |
| 989 | |
| 990 | static int |
| 991 | rutime(char *path, long atime, long mtime) |
| 992 | { |
| 993 | Dir ndir; |
| 994 | int err; |
| 995 | |
| 996 | trace("rutime(%s, %ld, %ld)", path, atime, mtime); |
| 997 | |
| 998 | nulldir(&ndir); |
| 999 | ndir.atime = atime; |
| 1000 | ndir.mtime = mtime; |
| 1001 | |
| 1002 | if((err = uwstat(path, &ndir, 1)) < 0){ |
| 1003 | char *t; |
| 1004 | |
| 1005 | if(t = resolvepath1(path, 0)){ |
| 1006 | err = fsutime(t, atime, mtime); |
| 1007 | free(t); |
| 1008 | } |
| 1009 | } |
| 1010 | return err; |
| 1011 | } |
| 1012 | |
| 1013 | static int |
| 1014 | rchmod(char *path, int mode) |
| 1015 | { |
| 1016 | Dir ndir; |
| 1017 | int err; |
| 1018 | |
| 1019 | trace("rchmod(%s, %#o)", path, mode); |
| 1020 | |
| 1021 | nulldir(&ndir); |
| 1022 | ndir.mode = mode; |
| 1023 | |
| 1024 | if((err = uwstat(path, &ndir, 1)) < 0){ |
| 1025 | char *t; |
| 1026 | |
| 1027 | if(t = resolvepath1(path, 0)){ |
| 1028 | err = fschmod(t, mode); |
| 1029 | free(t); |
| 1030 | } |
| 1031 | } |
| 1032 | return err; |
| 1033 | } |
| 1034 | |
| 1035 | static int |
| 1036 | rchown(char *path, int uid, int gid, int link) |
| 1037 | { |
| 1038 | Ustat s; |
| 1039 | |
| 1040 | USED(uid); |
| 1041 | USED(gid); |
| 1042 | |
| 1043 | /* FIXME, just return the right errorcode for now */ |
| 1044 | return fsstat(path, link, &s); |
| 1045 | } |
| 1046 | |
| 1047 | static int |
| 1048 | rtruncate(char *path, vlong size) |
| 1049 | { |
| 1050 | Dir ndir; |
| 1051 | int err; |
| 1052 | |
| 1053 | trace("rtruncate(%s, %lld)", path, size); |
| 1054 | |
| 1055 | nulldir(&ndir); |
| 1056 | ndir.length = size; |
| 1057 | |
| 1058 | if((err = uwstat(path, &ndir, 0)) < 0){ |
| 1059 | char *t; |
| 1060 | |
| 1061 | if(t = resolvepath1(path, 0)){ |
| 1062 | err = fstruncate(t, size); |
| 1063 | free(t); |
| 1064 | } |
| 1065 | } |
| 1066 | return err; |
| 1067 | } |
| 1068 | |
| 1069 | static int |
| 1070 | rfchmod(Ufile *f, int mode) |
| 1071 | { |
| 1072 | Dir ndir; |
| 1073 | |
| 1074 | nulldir(&ndir); |
| 1075 | ndir.mode = mode; |
| 1076 | return uwfstat(f, &ndir); |
| 1077 | } |
| 1078 | |
| 1079 | static int |
| 1080 | rfchown(Ufile *f, int uid, int gid) |
| 1081 | { |
| 1082 | USED(f); |
| 1083 | USED(uid); |
| 1084 | USED(gid); |
| 1085 | |
| 1086 | return 0; |
| 1087 | } |
| 1088 | |
| 1089 | static int |
| 1090 | rftruncate(Ufile *f, vlong size) |
| 1091 | { |
| 1092 | Dir ndir; |
| 1093 | |
| 1094 | nulldir(&ndir); |
| 1095 | ndir.length = size; |
| 1096 | return uwfstat(f, &ndir); |
| 1097 | } |
| 1098 | |
| 1099 | static int |
| 1100 | runlink(char *path, int rmdir) |
| 1101 | { |
| 1102 | int err; |
| 1103 | Dir *dir; |
| 1104 | char *t, *s; |
| 1105 | char *base; |
| 1106 | char *name; |
| 1107 | char *rpath; |
| 1108 | Rpath **prp; |
| 1109 | |
| 1110 | trace("runlink(%s, %d)", path, rmdir); |
| 1111 | |
| 1112 | rpath = nil; |
| 1113 | dir = nil; |
| 1114 | err = -EINVAL; |
| 1115 | if((base = basepath(path, &name)) == nil) |
| 1116 | goto out; |
| 1117 | if(dir = dirstat(shortpath(current->kcwd, path))){ |
| 1118 | rpath = kstrdup(path); |
| 1119 | } else { |
| 1120 | rpath = udirpath(base, name, 'L'); |
| 1121 | dir = dirstat(shortpath(current->kcwd, rpath)); |
| 1122 | } |
| 1123 | if(dir == nil){ |
| 1124 | err = mkerror(); |
| 1125 | if(t = resolvepath1(path, 0)){ |
| 1126 | err = fsunlink(t, rmdir); |
| 1127 | free(t); |
| 1128 | } |
| 1129 | goto out; |
| 1130 | } |
| 1131 | if(rmdir){ |
| 1132 | if((dir->mode & DMDIR) == 0){ |
| 1133 | err = -ENOTDIR; |
| 1134 | goto out; |
| 1135 | } |
| 1136 | } else { |
| 1137 | if(dir->mode & DMDIR){ |
| 1138 | err = -EISDIR; |
| 1139 | goto out; |
| 1140 | } |
| 1141 | } |
| 1142 | |
| 1143 | s = shortpath(current->kcwd, rpath); |
| 1144 | |
| 1145 | qlock(&rpathtablk); |
| 1146 | prp = rpathent(path); |
| 1147 | if(*prp){ |
| 1148 | Dir ndir; |
| 1149 | |
| 1150 | t = ksmprint(".%s.%d.deleted", name, current->kpid); |
| 1151 | nulldir(&ndir); |
| 1152 | ndir.name = t; |
| 1153 | trace("runlink: file %s still in use renaming to -> %s", path, t); |
| 1154 | if(dirwstat(s, &ndir) < 0){ |
| 1155 | qunlock(&rpathtablk); |
| 1156 | err = mkerror(); |
| 1157 | free(t); |
| 1158 | goto out; |
| 1159 | } |
| 1160 | free(t); |
| 1161 | (*prp)->deleted = 1; |
| 1162 | qunlock(&rpathtablk); |
| 1163 | |
| 1164 | } else { |
| 1165 | int x; |
| 1166 | qunlock(&rpathtablk); |
| 1167 | |
| 1168 | x = 0; |
| 1169 | while(remove(s) < 0){ |
| 1170 | err = mkerror(); |
| 1171 | if(++x > 8){ |
| 1172 | /* old debian bug clashes with mntgen */ |
| 1173 | if(strcmp(base, "/")==0 && strstr(path, ".dpkg-")) |
| 1174 | err = -ENOENT; |
| 1175 | goto out; |
| 1176 | } |
| 1177 | } |
| 1178 | } |
| 1179 | err = 0; |
| 1180 | out: |
| 1181 | free(dir); |
| 1182 | free(name); |
| 1183 | free(base); |
| 1184 | free(rpath); |
| 1185 | |
| 1186 | return err; |
| 1187 | } |
| 1188 | |
| 1189 | static int |
| 1190 | rlink(char *old, char *new, int sym) |
| 1191 | { |
| 1192 | int err; |
| 1193 | int fd; |
| 1194 | char *base; |
| 1195 | char *name; |
| 1196 | char *t; |
| 1197 | |
| 1198 | trace("rlink(%s, %s, %d)", old, new, sym); |
| 1199 | |
| 1200 | if((base = basepath(new, &name)) == nil) |
| 1201 | return -EINVAL; |
| 1202 | |
| 1203 | /* resolve base directory */ |
| 1204 | if((fd = open(shortpath(current->kcwd, base), OREAD)) < 0){ |
| 1205 | err = mkerror(); |
| 1206 | if(t = resolvepath1(base, 0)){ |
| 1207 | free(base); base = t; |
| 1208 | t = allocpath(base, nil, name); |
| 1209 | err = fslink(old, t, sym); |
| 1210 | free(t); |
| 1211 | } |
| 1212 | goto out; |
| 1213 | } |
| 1214 | close(fd); |
| 1215 | |
| 1216 | if(sym == 0){ |
| 1217 | if((err = resolvefromtopath(&old, &new)) == 0) |
| 1218 | err = copyfile(old, new); |
| 1219 | free(old); |
| 1220 | free(new); |
| 1221 | goto out; |
| 1222 | } |
| 1223 | |
| 1224 | /* check if regular file is in the way */ |
| 1225 | err = -EEXIST; |
| 1226 | if((fd = open(shortpath(current->kcwd, new), OREAD)) >= 0){ |
| 1227 | close(fd); |
| 1228 | goto out; |
| 1229 | } |
| 1230 | |
| 1231 | /* try to create the link, will fail if alreadt exists */ |
| 1232 | t = udirpath(base, name, 'L'); |
| 1233 | if((fd = create(shortpath(current->kcwd, t), OWRITE|OEXCL, 0777)) < 0){ |
| 1234 | err = mkerror(); |
| 1235 | free(t); |
| 1236 | goto out; |
| 1237 | } |
| 1238 | free(t); |
| 1239 | |
| 1240 | if(write(fd, old, strlen(old)) < 0){ |
| 1241 | err = mkerror(); |
| 1242 | close(fd); |
| 1243 | goto out; |
| 1244 | } |
| 1245 | close(fd); |
| 1246 | err = 0; |
| 1247 | out: |
| 1248 | free(base); |
| 1249 | free(name); |
| 1250 | return err; |
| 1251 | } |
| 1252 | |
| 1253 | static Udev rootdev = |
| 1254 | { |
| 1255 | .open = ropen, |
| 1256 | .access = raccess, |
| 1257 | .stat = rstat, |
| 1258 | .link = rlink, |
| 1259 | .unlink = runlink, |
| 1260 | .rename = rrename, |
| 1261 | .mkdir = rmkdir, |
| 1262 | .utime = rutime, |
| 1263 | .chmod = rchmod, |
| 1264 | .chown = rchown, |
| 1265 | .truncate = rtruncate, |
| 1266 | |
| 1267 | .read = rread, |
| 1268 | .write = rwrite, |
| 1269 | .size = rsize, |
| 1270 | .close = rclose, |
| 1271 | |
| 1272 | .fstat = rfstat, |
| 1273 | .readdir = rreaddir, |
| 1274 | .readlink = rreadlink, |
| 1275 | |
| 1276 | .fchmod = rfchmod, |
| 1277 | .fchown = rfchown, |
| 1278 | .ftruncate = rftruncate, |
| 1279 | }; |
| 1280 | |
| 1281 | void rootdevinit(void) |
| 1282 | { |
| 1283 | devtab[ROOTDEV] = &rootdev; |
| 1284 | |
| 1285 | fsmount(&rootdev, ""); |
| 1286 | } |