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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 | /* * linux/fs/proc/root.c * * Copyright (C) 1991, 1992 Linus Torvalds * * proc root directory handling functions */ #include <asm/uaccess.h> #include <linux/errno.h> #include <linux/sched.h> #include <linux/proc_fs.h> #include <linux/stat.h> #include <linux/config.h> #include <asm/bitops.h> #ifdef CONFIG_KERNELD #include <linux/kerneld.h> #endif /* * Offset of the first process in the /proc root directory.. */ #define FIRST_PROCESS_ENTRY 256 static int proc_root_readdir(struct file *, void *, filldir_t); static int proc_root_lookup(struct inode *,struct dentry *); static int proc_unlink(struct inode *, struct dentry *); static unsigned char proc_alloc_map[PROC_NDYNAMIC / 8] = {0}; /* * These are the generic /proc directory operations. They * use the in-memory "struct proc_dir_entry" tree to parse * the /proc directory. * * NOTE! The /proc/scsi directory currently does not correctly * build up the proc_dir_entry tree, and will show up empty. */ static struct file_operations proc_dir_operations = { NULL, /* lseek - default */ NULL, /* read - bad */ NULL, /* write - bad */ proc_readdir, /* readdir */ NULL, /* poll - default */ NULL, /* ioctl - default */ NULL, /* mmap */ NULL, /* no special open code */ NULL, /* no special release code */ NULL /* can't fsync */ }; /* * proc directories can do almost nothing.. */ struct inode_operations proc_dir_inode_operations = { &proc_dir_operations, /* default net directory file-ops */ NULL, /* create */ proc_lookup, /* lookup */ NULL, /* link */ NULL, /* unlink */ NULL, /* symlink */ NULL, /* mkdir */ NULL, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ NULL, /* readlink */ NULL, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL, /* truncate */ NULL /* permission */ }; /* * /proc dynamic directories now support unlinking */ struct inode_operations proc_dyna_dir_inode_operations = { &proc_dir_operations, /* default proc dir ops */ NULL, /* create */ proc_lookup, /* lookup */ NULL, /* link */ proc_unlink, /* unlink(struct inode *, struct dentry *) */ NULL, /* symlink */ NULL, /* mkdir */ NULL, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ NULL, /* readlink */ NULL, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL, /* truncate */ NULL /* permission */ }; /* * The root /proc directory is special, as it has the * <pid> directories. Thus we don't use the generic * directory handling functions for that.. */ static struct file_operations proc_root_operations = { NULL, /* lseek - default */ NULL, /* read - bad */ NULL, /* write - bad */ proc_root_readdir, /* readdir */ NULL, /* poll - default */ NULL, /* ioctl - default */ NULL, /* mmap */ NULL, /* no special open code */ NULL, /* no special release code */ NULL /* no fsync */ }; /* * proc root can do almost nothing.. */ static struct inode_operations proc_root_inode_operations = { &proc_root_operations, /* default base directory file-ops */ NULL, /* create */ proc_root_lookup, /* lookup */ NULL, /* link */ NULL, /* unlink */ NULL, /* symlink */ NULL, /* mkdir */ NULL, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ NULL, /* readlink */ NULL, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL, /* truncate */ NULL /* permission */ }; /* * This is the root "inode" in the /proc tree.. */ struct proc_dir_entry proc_root = { PROC_ROOT_INO, 5, "/proc", S_IFDIR | S_IRUGO | S_IXUGO, 2, 0, 0, 0, &proc_root_inode_operations, NULL, NULL, NULL, &proc_root, NULL }; struct proc_dir_entry *proc_net, *proc_scsi; #ifdef CONFIG_MCA struct proc_dir_entry proc_mca = { PROC_MCA, 3, "mca", S_IFDIR | S_IRUGO | S_IXUGO, 2, 0, 0, 0, &proc_dir_inode_operations, NULL, NULL, NULL, &proc_root, NULL }; #endif #ifdef CONFIG_SYSCTL struct proc_dir_entry proc_sys_root = { PROC_SYS, 3, "sys", /* inode, name */ S_IFDIR | S_IRUGO | S_IXUGO, 2, 0, 0, /* mode, nlink, uid, gid */ 0, &proc_dir_inode_operations, /* size, ops */ NULL, NULL, /* get_info, fill_inode */ NULL, /* next */ NULL, NULL /* parent, subdir */ }; #endif #if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE) static int (*proc_openprom_defreaddir_ptr)(struct inode *, struct file *, void *, filldir_t); static int (*proc_openprom_deflookup_ptr)(struct inode *, struct dentry *); void (*proc_openprom_use)(struct inode *, int) = 0; static struct openpromfs_dev *proc_openprom_devices = NULL; static ino_t proc_openpromdev_ino = PROC_OPENPROMD_FIRST; struct inode_operations * proc_openprom_register(int (*readdir)(struct inode *, struct file *, void *, filldir_t), int (*lookup)(struct inode *, struct dentry *), void (*use)(struct inode *, int), struct openpromfs_dev ***devices) { proc_openprom_defreaddir_ptr = (proc_openprom_inode_operations.default_file_ops)->readdir; proc_openprom_deflookup_ptr = proc_openprom_inode_operations.lookup; (proc_openprom_inode_operations.default_file_ops)->readdir = readdir; proc_openprom_inode_operations.lookup = lookup; proc_openprom_use = use; *devices = &proc_openprom_devices; return &proc_openprom_inode_operations; } int proc_openprom_regdev(struct openpromfs_dev *d) { if (proc_openpromdev_ino == PROC_OPENPROMD_FIRST + PROC_NOPENPROMD) return -1; d->next = proc_openprom_devices; d->inode = proc_openpromdev_ino++; proc_openprom_devices = d; return 0; } int proc_openprom_unregdev(struct openpromfs_dev *d) { if (d == proc_openprom_devices) { proc_openprom_devices = d->next; } else if (!proc_openprom_devices) return -1; else { struct openpromfs_dev *p; for (p = proc_openprom_devices; p->next != d && p->next; p = p->next); if (!p->next) return -1; p->next = d->next; } return 0; } #ifdef CONFIG_SUN_OPENPROMFS_MODULE void proc_openprom_deregister(void) { (proc_openprom_inode_operations.default_file_ops)->readdir = proc_openprom_defreaddir_ptr; proc_openprom_inode_operations.lookup = proc_openprom_deflookup_ptr; proc_openprom_use = 0; } #endif #if defined(CONFIG_SUN_OPENPROMFS_MODULE) && defined(CONFIG_KERNELD) static int proc_openprom_defreaddir(struct inode * inode, struct file * filp, void * dirent, filldir_t filldir) { request_module("openpromfs"); if ((proc_openprom_inode_operations.default_file_ops)->readdir != proc_openprom_defreaddir) return (proc_openprom_inode_operations.default_file_ops)->readdir (inode, filp, dirent, filldir); return -EINVAL; } #define OPENPROM_DEFREADDIR proc_openprom_defreaddir static int proc_openprom_deflookup(struct inode * dir, struct dentry *dentry) { request_module("openpromfs"); if (proc_openprom_inode_operations.lookup != proc_openprom_deflookup) return proc_openprom_inode_operations.lookup (dir, dentry); return -ENOENT; } #define OPENPROM_DEFLOOKUP proc_openprom_deflookup #else #define OPENPROM_DEFREADDIR NULL #define OPENPROM_DEFLOOKUP NULL #endif static struct file_operations proc_openprom_operations = { NULL, /* lseek - default */ NULL, /* read - bad */ NULL, /* write - bad */ OPENPROM_DEFREADDIR, /* readdir */ NULL, /* poll - default */ NULL, /* ioctl - default */ NULL, /* mmap */ NULL, /* no special open code */ NULL, /* no special release code */ NULL /* can't fsync */ }; struct inode_operations proc_openprom_inode_operations = { &proc_openprom_operations,/* default net directory file-ops */ NULL, /* create */ OPENPROM_DEFLOOKUP, /* lookup */ NULL, /* link */ NULL, /* unlink */ NULL, /* symlink */ NULL, /* mkdir */ NULL, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ NULL, /* readlink */ NULL, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL, /* truncate */ NULL /* permission */ }; struct proc_dir_entry proc_openprom = { PROC_OPENPROM, 8, "openprom", S_IFDIR | S_IRUGO | S_IXUGO, 2, 0, 0, 0, &proc_openprom_inode_operations, NULL, NULL, NULL, &proc_root, NULL }; extern void openpromfs_init (void); #endif /* CONFIG_SUN_OPENPROMFS */ static int make_inode_number(void) { int i = find_first_zero_bit((void *) proc_alloc_map, PROC_NDYNAMIC); if (i<0 || i>=PROC_NDYNAMIC) return -1; set_bit(i, (void *) proc_alloc_map); return PROC_DYNAMIC_FIRST + i; } int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp) { int i; if (dp->low_ino == 0) { i = make_inode_number(); if (i < 0) return -EAGAIN; dp->low_ino = i; } dp->next = dir->subdir; dp->parent = dir; dir->subdir = dp; if (S_ISDIR(dp->mode)) { if (dp->ops == NULL) dp->ops = &proc_dir_inode_operations; dir->nlink++; } else { if (dp->ops == NULL) dp->ops = &proc_file_inode_operations; } /* * kludge until we fixup the md device driver */ if (dp->low_ino == PROC_MD) dp->ops = &proc_array_inode_operations; return 0; } int proc_unregister(struct proc_dir_entry * dir, int ino) { struct proc_dir_entry **p = &dir->subdir, *dp; while ((dp = *p) != NULL) { if (dp->low_ino == ino) { *p = dp->next; dp->next = NULL; if (S_ISDIR(dp->mode)) dir->nlink--; if (ino >= PROC_DYNAMIC_FIRST && ino < PROC_DYNAMIC_FIRST+PROC_NDYNAMIC) clear_bit(ino-PROC_DYNAMIC_FIRST, (void *) proc_alloc_map); return 0; } p = &dp->next; } return -EINVAL; } /* * /proc/self: */ static int proc_self_readlink(struct inode * inode, char * buffer, int buflen) { int len; char tmp[30]; len = sprintf(tmp, "%d", current->pid); if (buflen < len) len = buflen; copy_to_user(buffer, tmp, len); return len; } static struct dentry * proc_self_follow_link(struct inode *inode, struct dentry *base) { int len; char tmp[30]; len = sprintf(tmp, "%d", current->pid); return lookup_dentry(tmp, base, 1); } static struct inode_operations proc_self_inode_operations = { NULL, /* no file-ops */ NULL, /* create */ NULL, /* lookup */ NULL, /* link */ NULL, /* unlink */ NULL, /* symlink */ NULL, /* mkdir */ NULL, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ proc_self_readlink, /* readlink */ proc_self_follow_link, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL, /* truncate */ NULL /* permission */ }; static struct proc_dir_entry proc_root_loadavg = { PROC_LOADAVG, 7, "loadavg", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_uptime = { PROC_UPTIME, 6, "uptime", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_meminfo = { PROC_MEMINFO, 7, "meminfo", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_kmsg = { PROC_KMSG, 4, "kmsg", S_IFREG | S_IRUSR, 1, 0, 0, 0, &proc_kmsg_inode_operations }; static struct proc_dir_entry proc_root_version = { PROC_VERSION, 7, "version", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #ifdef CONFIG_PCI static struct proc_dir_entry proc_root_pci = { PROC_PCI, 3, "pci", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #endif #ifdef CONFIG_ZORRO static struct proc_dir_entry proc_root_zorro = { PROC_ZORRO, 5, "zorro", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #endif static struct proc_dir_entry proc_root_cpuinfo = { PROC_CPUINFO, 7, "cpuinfo", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #if defined (CONFIG_AMIGA) || defined (CONFIG_ATARI) static struct proc_dir_entry proc_root_hardware = { PROC_HARDWARE, 8, "hardware", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #endif static struct proc_dir_entry proc_root_self = { PROC_SELF, 4, "self", S_IFLNK | S_IRUGO | S_IWUGO | S_IXUGO, 1, 0, 0, 64, &proc_self_inode_operations, }; #ifdef CONFIG_DEBUG_MALLOC static struct proc_dir_entry proc_root_malloc = { PROC_MALLOC, 6, "malloc", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #endif static struct proc_dir_entry proc_root_kcore = { PROC_KCORE, 5, "kcore", S_IFREG | S_IRUSR, 1, 0, 0, 0, &proc_kcore_inode_operations }; #ifdef CONFIG_MODULES static struct proc_dir_entry proc_root_modules = { PROC_MODULES, 7, "modules", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_ksyms = { PROC_KSYMS, 5, "ksyms", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #endif static struct proc_dir_entry proc_root_stat = { PROC_STAT, 4, "stat", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_devices = { PROC_DEVICES, 7, "devices", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_interrupts = { PROC_INTERRUPTS, 10,"interrupts", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #ifdef __SMP_PROF__ static struct proc_dir_entry proc_root_smp = { PROC_SMP_PROF, 3,"smp", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #endif static struct proc_dir_entry proc_root_filesystems = { PROC_FILESYSTEMS, 11,"filesystems", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_dma = { PROC_DMA, 3, "dma", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_ioports = { PROC_IOPORTS, 7, "ioports", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_cmdline = { PROC_CMDLINE, 7, "cmdline", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #ifdef CONFIG_RTC static struct proc_dir_entry proc_root_rtc = { PROC_RTC, 3, "rtc", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #endif static struct proc_dir_entry proc_root_locks = { PROC_LOCKS, 5, "locks", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_mounts = { PROC_MTAB, 6, "mounts", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_swaps = { PROC_SWAP, 5, "swaps", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_profile = { PROC_PROFILE, 7, "profile", S_IFREG | S_IRUGO | S_IWUSR, 1, 0, 0, 0, &proc_profile_inode_operations }; static struct proc_dir_entry proc_root_slab = { PROC_SLABINFO, 8, "slabinfo", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #ifdef CONFIG_OMIRR static struct proc_dir_entry proc_root_omirr = { PROC_OMIRR, 5, "omirr", S_IFREG | S_IRUSR, 1, 0, 0, 0, &proc_omirr_inode_operations }; #endif #ifdef __powerpc__ static struct proc_dir_entry proc_root_ppc_htab = { PROC_PPC_HTAB, 8, "ppc_htab", S_IFREG | S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH, 1, 0, 0, 0, &proc_ppc_htab_inode_operations, NULL, NULL, /* get_info, fill_inode */ NULL, /* next */ NULL, NULL /* parent, subdir */ }; #endif void proc_root_init(void) { proc_base_init(); proc_register(&proc_root, &proc_root_loadavg); proc_register(&proc_root, &proc_root_uptime); proc_register(&proc_root, &proc_root_meminfo); proc_register(&proc_root, &proc_root_kmsg); proc_register(&proc_root, &proc_root_version); #ifdef CONFIG_PCI proc_register(&proc_root, &proc_root_pci); #endif #ifdef CONFIG_ZORRO proc_register(&proc_root, &proc_root_zorro); #endif proc_register(&proc_root, &proc_root_cpuinfo); proc_register(&proc_root, &proc_root_self); proc_net = create_proc_entry("net", S_IFDIR, 0); proc_scsi = create_proc_entry("scsi", S_IFDIR, 0); #ifdef CONFIG_SYSCTL proc_register(&proc_root, &proc_sys_root); #endif #ifdef CONFIG_MCA proc_register(&proc_root, &proc_mca); #endif #ifdef CONFIG_DEBUG_MALLOC proc_register(&proc_root, &proc_root_malloc); #endif proc_register(&proc_root, &proc_root_kcore); proc_root_kcore.size = (MAP_NR(high_memory) << PAGE_SHIFT) + PAGE_SIZE; #ifdef CONFIG_MODULES proc_register(&proc_root, &proc_root_modules); proc_register(&proc_root, &proc_root_ksyms); #endif proc_register(&proc_root, &proc_root_stat); proc_register(&proc_root, &proc_root_devices); proc_register(&proc_root, &proc_root_interrupts); #ifdef __SMP_PROF__ proc_register(&proc_root, &proc_root_smp); #endif proc_register(&proc_root, &proc_root_filesystems); proc_register(&proc_root, &proc_root_dma); proc_register(&proc_root, &proc_root_ioports); proc_register(&proc_root, &proc_root_cmdline); #ifdef CONFIG_RTC proc_register(&proc_root, &proc_root_rtc); #endif proc_register(&proc_root, &proc_root_locks); proc_register(&proc_root, &proc_root_mounts); proc_register(&proc_root, &proc_root_swaps); #if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE) #ifdef CONFIG_SUN_OPENPROMFS openpromfs_init (); #endif proc_register(&proc_root, &proc_openprom); #endif #if defined (CONFIG_AMIGA) || defined (CONFIG_ATARI) proc_register(&proc_root, &proc_root_hardware); #endif proc_register(&proc_root, &proc_root_slab); if (prof_shift) { proc_register(&proc_root, &proc_root_profile); proc_root_profile.size = (1+prof_len) * sizeof(unsigned long); } proc_tty_init(); #ifdef __powerpc__ proc_register(&proc_root, &proc_root_ppc_htab); #endif #ifdef CONFIG_PROC_DEVICETREE proc_device_tree_init(); #endif } /* * As some entries in /proc are volatile, we want to * get rid of unused dentries. This could be made * smarter: we could keep a "volatile" flag in the * inode to indicate which ones to keep. */ static void proc_delete_dentry(struct dentry * dentry) { d_drop(dentry); } static struct dentry_operations proc_dentry_operations = { NULL, /* revalidate */ NULL, /* d_hash */ NULL, /* d_compare */ proc_delete_dentry /* d_delete(struct dentry *) */ }; /* * Don't create negative dentries here, return -ENOENT by hand * instead. */ int proc_lookup(struct inode * dir, struct dentry *dentry) { struct inode *inode; struct proc_dir_entry * de; int error; error = -ENOTDIR; if (!dir || !S_ISDIR(dir->i_mode)) goto out; error = -ENOENT; inode = NULL; de = (struct proc_dir_entry *) dir->u.generic_ip; if (de) { for (de = de->subdir; de ; de = de->next) { if (!de || !de->low_ino) continue; if (de->namelen != dentry->d_name.len) continue; if (!memcmp(dentry->d_name.name, de->name, de->namelen)) { int ino = de->low_ino | (dir->i_ino & ~(0xffff)); error = -EINVAL; inode = proc_get_inode(dir->i_sb, ino, de); break; } } } if (inode) { dentry->d_op = &proc_dentry_operations; d_add(dentry, inode); error = 0; } out: return error; } static int proc_root_lookup(struct inode * dir, struct dentry * dentry) { unsigned int pid, c; struct task_struct *p; const char *name; struct inode *inode; int len; if (dir->i_ino == PROC_ROOT_INO) { /* check for safety... */ dir->i_nlink = proc_root.nlink; read_lock(&tasklist_lock); for_each_task(p) { if (p->pid) dir->i_nlink++; } read_unlock(&tasklist_lock); } if (!proc_lookup(dir, dentry)) return 0; pid = 0; name = dentry->d_name.name; len = dentry->d_name.len; while (len-- > 0) { c = *name - '0'; name++; if (c > 9) { pid = 0; break; } pid *= 10; pid += c; if (pid & 0xffff0000) { pid = 0; break; } } p = find_task_by_pid(pid); inode = NULL; if (pid && p) { unsigned long ino = (pid << 16) + PROC_PID_INO; inode = proc_get_inode(dir->i_sb, ino, &proc_pid); if (!inode) return -EINVAL; } dentry->d_op = &proc_dentry_operations; d_add(dentry, inode); return 0; } /* * This returns non-zero if at EOF, so that the /proc * root directory can use this and check if it should * continue with the <pid> entries.. * * Note that the VFS-layer doesn't care about the return * value of the readdir() call, as long as it's non-negative * for success.. */ int proc_readdir(struct file * filp, void * dirent, filldir_t filldir) { struct proc_dir_entry * de; unsigned int ino; int i; struct inode *inode = filp->f_dentry->d_inode; if (!inode || !S_ISDIR(inode->i_mode)) return -ENOTDIR; ino = inode->i_ino; de = (struct proc_dir_entry *) inode->u.generic_ip; if (!de) return -EINVAL; i = filp->f_pos; switch (i) { case 0: if (filldir(dirent, ".", 1, i, ino) < 0) return 0; i++; filp->f_pos++; /* fall through */ case 1: if (filldir(dirent, "..", 2, i, de->parent->low_ino) < 0) return 0; i++; filp->f_pos++; /* fall through */ default: ino &= ~0xffff; de = de->subdir; i -= 2; for (;;) { if (!de) return 1; if (!i) break; de = de->next; i--; } do { if (filldir(dirent, de->name, de->namelen, filp->f_pos, ino | de->low_ino) < 0) return 0; filp->f_pos++; de = de->next; } while (de); } return 1; } #define NUMBUF 10 static int proc_root_readdir(struct file * filp, void * dirent, filldir_t filldir) { struct task_struct *p; char buf[NUMBUF]; unsigned int nr = filp->f_pos; if (nr < FIRST_PROCESS_ENTRY) { int error = proc_readdir(filp, dirent, filldir); if (error <= 0) return error; filp->f_pos = FIRST_PROCESS_ENTRY; } nr = FIRST_PROCESS_ENTRY; read_lock(&tasklist_lock); for_each_task(p) { unsigned int pid; if(nr++ < filp->f_pos) continue; if((pid = p->pid) != 0) { unsigned long j = NUMBUF, i = pid; do { j--; buf[j] = '0' + (i % 10); i /= 10; } while (i); if (filldir(dirent, buf+j, NUMBUF-j, filp->f_pos, (pid << 16) + PROC_PID_INO) < 0) break; } filp->f_pos++; } read_unlock(&tasklist_lock); return 0; } static int proc_unlink(struct inode *dir, struct dentry *dentry) { struct proc_dir_entry * dp = dir->u.generic_ip; printk("proc_file_unlink: deleting %s/%s\n", dp->name, dentry->d_name.name); remove_proc_entry(dentry->d_name.name, dp); dentry->d_inode->i_nlink = 0; d_delete(dentry); return 0; } |