release/src/router/rc/usb.c

   1 /*
   2
   3         USB Support
   4
   5 */
   6 #include "rc.h"
   7
   8 #include <sys/types.h>
   9 #include <unistd.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <arpa/inet.h>
  13 #include <time.h>
  14 #include <sys/time.h>
  15 #include <errno.h>
  16
  17 #include <sys/mount.h>
  18 #include <mntent.h>
  19 #include <dirent.h>
  20 #include <sys/file.h>
  21 #include <sys/swap.h>
  22
  23 /* Adjust bdflush parameters.
  24  * Do this here, because Tomato doesn't have the sysctl command.
  25  * With these values, a disk block should be written to disk within 2 seconds.
  26  */
  27 #ifdef LINUX26
  28 void tune_bdflush(void)
  29 {
  30         f_write_string("/proc/sys/vm/dirty_expire_centisecs", "200", 0, 0);
  31         f_write_string("/proc/sys/vm/dirty_writeback_centisecs", "200", 0, 0);
  32 }
  33 #else
  34 #include <sys/kdaemon.h>
  35 #define SET_PARM(n) (n * 2 | 1)
  36 void tune_bdflush(void)
  37 {
  38         bdflush(SET_PARM(5), 100);
  39         bdflush(SET_PARM(6), 100);
  40         bdflush(SET_PARM(8), 0);
  41 }
  42 #endif // LINUX26
  43
  44 #define USBCORE_MOD     "usbcore"
  45 #define USB20_MOD       "ehci-hcd"
  46 #define USBSTORAGE_MOD  "usb-storage"
  47 #define SCSI_MOD        "scsi_mod"
  48 #define SD_MOD          "sd_mod"
  49 #ifdef LINUX26
  50 #define USBOHCI_MOD     "ohci-hcd"
  51 #define USBUHCI_MOD     "uhci-hcd"
  52 #define USBPRINTER_MOD  "usblp"
  53 #define SCSI_WAIT_MOD   "scsi_wait_scan"
  54 #define USBFS           "usbfs"
  55 #else
  56 #define USBOHCI_MOD     "usb-ohci"
  57 #define USBUHCI_MOD     "usb-uhci"
  58 #define USBPRINTER_MOD  "printer"
  59 #define USBFS           "usbdevfs"
  60 #endif
  61
  62 static int p9100d_sig(int sig)
  63 {
  64         const char p910pid[] = "/var/run/p9100d.pid";
  65         char s[32];
  66         int pid;
  67
  68         if (f_read_string(p910pid, s, sizeof(s)) > 0) {
  69                 if ((pid = atoi(s)) > 1) {
  70                         if (kill(pid, sig) == 0) {
  71                                 if (sig == SIGTERM) {
  72                                         sleep(1);
  73                                         unlink(p910pid);
  74                                 }
  75                                 return 0;
  76                         }
  77                 }
  78         }
  79         return -1;
  80 }
  81
  82 void start_usb(void)
  83 {
  84         char param[32];
  85         int i;
  86
  87         _dprintf("%s\n", __FUNCTION__);
  88         tune_bdflush();
  89
  90         if (nvram_get_int("usb_enable")) {
  91                 modprobe(USBCORE_MOD);
  92
  93                 /* mount usb device filesystem */
  94                 mount(USBFS, "/proc/bus/usb", USBFS, MS_MGC_VAL, NULL);
  95
  96 #ifdef LINUX26
  97                 i = do_led(LED_USB, LED_PROBE);
  98                 if (i != 255) {
  99                         modprobe("ledtrig-usbdev");
 100                         modprobe("leds-usb");
 101                         sprintf(param, "%d", i);
 102                         f_write_string("/sys/class/leds/usb-led/gpio_pin", param, 0, 0);
 103                         f_write_string("/sys/class/leds/usb-led/device_name", "1-1", 0, 0);
 104                 }
 105 #endif
 106                 if (nvram_get_int("usb_storage")) {
 107                         /* insert scsi and storage modules before usb drivers */
 108                         modprobe(SCSI_MOD);
 109 #ifdef LINUX26
 110                         modprobe(SCSI_WAIT_MOD);
 111 #endif
 112                         modprobe(SD_MOD);
 113                         modprobe(USBSTORAGE_MOD);
 114
 115                         if (nvram_get_int("usb_fs_ext3")) {
 116 #ifdef LINUX26
 117                                 modprobe("mbcache");    // used by ext2/ext3
 118 #endif
 119                                 /* insert ext3 first so that lazy mount tries ext3 before ext2 */
 120                                 modprobe("jbd");
 121                                 modprobe("ext3");
 122                                 modprobe("ext2");
 123                         }
 124
 125                         if (nvram_get_int("usb_fs_fat")) {
 126                                 modprobe("fat");
 127                                 modprobe("vfat");
 128                         }
 129                 }
 130
 131                 /* if enabled, force USB2 before USB1.1 */
 132                 if (nvram_get_int("usb_usb2") == 1) {
 133                         i = nvram_get_int("usb_irq_thresh");
 134                         if ((i < 0) || (i > 6))
 135                                 i = 0;
 136                         sprintf(param, "log2_irq_thresh=%d", i);
 137                         modprobe(USB20_MOD, param);
 138                 }
 139
 140                 if (nvram_get_int("usb_uhci") == 1) {
 141                         modprobe(USBUHCI_MOD);
 142                 }
 143
 144                 if (nvram_get_int("usb_ohci") == 1) {
 145                         modprobe(USBOHCI_MOD);
 146                 }
 147
 148                 if (nvram_get_int("usb_printer")) {
 149                         symlink("/dev/usb", "/dev/printers");
 150                         modprobe(USBPRINTER_MOD);
 151
 152                         /* start printer server only if not already running */
 153                         if (p9100d_sig(0) != 0) {
 154                                 eval("p910nd",
 155                                 nvram_get_int("usb_printer_bidirect") ? "-b" : "", //bidirectional
 156                                 "-f", "/dev/usb/lp0", // device
 157                                 "0" // listen port
 158                                 );
 159                         }
 160                 }
 161         }
 162 }
 163
 164 void stop_usb(void)
 165 {
 166         int disabled = !nvram_get_int("usb_enable");
 167
 168         // only find and kill the printer server we started (port 0)
 169         p9100d_sig(SIGTERM);
 170         modprobe_r(USBPRINTER_MOD);
 171
 172         // only stop storage services if disabled
 173         if (disabled || !nvram_get_int("usb_storage")) {
 174                 // Unmount all partitions
 175                 remove_storage_main(0);
 176
 177                 // Stop storage services
 178                 modprobe_r("ext2");
 179                 modprobe_r("ext3");
 180                 modprobe_r("jbd");
 181 #ifdef LINUX26
 182                 modprobe_r("mbcache");
 183 #endif
 184                 modprobe_r("vfat");
 185                 modprobe_r("fat");
 186                 modprobe_r("fuse");
 187                 sleep(1);
 188 #ifdef TCONFIG_SAMBASRV
 189                 modprobe_r("nls_cp437");
 190                 modprobe_r("nls_cp850");
 191                 modprobe_r("nls_cp852");
 192                 modprobe_r("nls_cp866");
 193 #ifdef LINUX26
 194                 modprobe_r("nls_cp932");
 195                 modprobe_r("nls_cp936");
 196                 modprobe_r("nls_cp949");
 197                 modprobe_r("nls_cp950");
 198 #endif
 199 #endif
 200                 modprobe_r(USBSTORAGE_MOD);
 201                 modprobe_r(SD_MOD);
 202 #ifdef LINUX26
 203                 modprobe_r(SCSI_WAIT_MOD);
 204 #endif
 205                 modprobe_r(SCSI_MOD);
 206         }
 207
 208         if (disabled || nvram_get_int("usb_ohci") != 1) modprobe_r(USBOHCI_MOD);
 209         if (disabled || nvram_get_int("usb_uhci") != 1) modprobe_r(USBUHCI_MOD);
 210         if (disabled || nvram_get_int("usb_usb2") != 1) modprobe_r(USB20_MOD);
 211
 212 #ifdef LINUX26
 213         modprobe_r("leds-usb");
 214         modprobe_r("ledtrig-usbdev");
 215         led(LED_USB, LED_OFF);
 216 #endif
 217
 218         // only unload core modules if usb is disabled
 219         if (disabled) {
 220                 umount("/proc/bus/usb"); // unmount usb device filesystem
 221                 modprobe_r(USBOHCI_MOD);
 222                 modprobe_r(USBUHCI_MOD);
 223                 modprobe_r(USB20_MOD);
 224                 modprobe_r(USBCORE_MOD);
 225         }
 226 }
 227
 228
 229 #define MOUNT_VAL_FAIL  0
 230 #define MOUNT_VAL_RONLY 1
 231 #define MOUNT_VAL_RW    2
 232 #define MOUNT_VAL_EXIST 3
 233
 234 int mount_r(char *mnt_dev, char *mnt_dir, char *type)
 235 {
 236         struct mntent *mnt;
 237         int ret;
 238         char options[140];
 239         char flagfn[128];
 240         int dir_made;
 241
 242         if ((mnt = findmntents(mnt_dev, 0, NULL, 0))) {
 243                 syslog(LOG_INFO, "USB partition at %s already mounted on %s",
 244                         mnt_dev, mnt->mnt_dir);
 245                 return MOUNT_VAL_EXIST;
 246         }
 247
 248         options[0] = 0;
 249
 250         if (type) {
 251                 unsigned long flags = MS_NOATIME | MS_NODEV;
 252
 253                 if (strcmp(type, "swap") == 0 || strcmp(type, "mbr") == 0) {
 254                         /* not a mountable partition */
 255                         flags = 0;
 256                 }
 257                 else if (strcmp(type, "ext2") == 0 || strcmp(type, "ext3") == 0) {
 258                         if (nvram_invmatch("usb_ext_opt", ""))
 259                                 sprintf(options, nvram_safe_get("usb_ext_opt"));
 260                 }
 261                 else if (strcmp(type, "vfat") == 0) {
 262                         if (nvram_invmatch("smbd_cset", ""))
 263                                 sprintf(options, "iocharset=%s%s",
 264                                         isdigit(nvram_get("smbd_cset")[0]) ? "cp" : "",
 265                                                 nvram_get("smbd_cset"));
 266                         if (nvram_invmatch("smbd_cpage", "")) {
 267                                 char *cp = nvram_safe_get("smbd_cpage");
 268                                 sprintf(options + strlen(options), ",codepage=%s" + (options[0] ? 0 : 1), cp);
 269                                 sprintf(flagfn, "nls_cp%s", cp);
 270
 271                                 cp = nvram_get("smbd_nlsmod");
 272                                 if ((cp) && (*cp != 0) && (strcmp(cp, flagfn) != 0))
 273                                         modprobe_r(cp);
 274
 275                                 modprobe(flagfn);
 276                                 nvram_set("smbd_nlsmod", flagfn);
 277                         }
 278                         sprintf(options + strlen(options), ",shortname=winnt" + (options[0] ? 0 : 1));
 279 #ifdef LINUX26
 280                         sprintf(options + strlen(options), ",flush" + (options[0] ? 0 : 1));
 281 #endif
 282                         if (nvram_invmatch("usb_fat_opt", ""))
 283                                 sprintf(options + strlen(options), "%s%s", options[0] ? "," : "", nvram_safe_get("usb_fat_opt"));
 284                 }
 285                 else if (strncmp(type, "ntfs", 4) == 0) {
 286                         if (nvram_invmatch("smbd_cset", ""))
 287                                 sprintf(options, "iocharset=%s%s",
 288                                         isdigit(nvram_get("smbd_cset")[0]) ? "cp" : "",
 289                                                 nvram_get("smbd_cset"));
 290                         if (nvram_invmatch("usb_ntfs_opt", ""))
 291                                 sprintf(options + strlen(options), "%s%s", options[0] ? "," : "", nvram_safe_get("usb_ntfs_opt"));
 292                 }
 293
 294                 if (flags) {
 295                         if ((dir_made = mkdir_if_none(mnt_dir))) {
 296                                 /* Create the flag file for remove the directory on dismount. */
 297                                 sprintf(flagfn, "%s/.autocreated-dir", mnt_dir);
 298                                 f_write(flagfn, NULL, 0, 0, 0);
 299                         }
 300
 301                         ret = mount(mnt_dev, mnt_dir, type, flags, options[0] ? options : "");
 302
 303                         /* try ntfs-3g in case it's installed */
 304                         if (ret != 0 && strncmp(type, "ntfs", 4) == 0) {
 305                                 sprintf(options + strlen(options), ",noatime,nodev" + (options[0] ? 0 : 1));
 306 #ifdef TCONFIG_NTFS
 307                                 if (nvram_get_int("usb_fs_ntfs"))
 308 #endif
 309                                         ret = eval("ntfs-3g", "-o", options, mnt_dev, mnt_dir);
 310                         }
 311                         if (ret != 0) /* give it another try - guess fs */
 312                                 ret = eval("mount", "-o", "noatime,nodev", mnt_dev, mnt_dir);
 313
 314                         if (ret == 0) {
 315                                 syslog(LOG_INFO, "USB %s%s fs at %s mounted on %s",
 316                                         type, (flags & MS_RDONLY) ? " (ro)" : "", mnt_dev, mnt_dir);
 317                                 return (flags & MS_RDONLY) ? MOUNT_VAL_RONLY : MOUNT_VAL_RW;
 318                         }
 319
 320                         if (dir_made) {
 321                                 unlink(flagfn);
 322                                 rmdir(mnt_dir);
 323                         }
 324                 }
 325         }
 326         return MOUNT_VAL_FAIL;
 327 }
 328
 329
 330 struct mntent *mount_fstab(char *dev_name, char *type, char *label, char *uuid)
 331 {
 332         struct mntent *mnt = NULL;
 333 #if 0
 334         if (eval("mount", "-a") == 0)
 335                 mnt = findmntents(dev_name, 0, NULL, 0);
 336 #else
 337         char spec[PATH_MAX+1];
 338
 339         if (label && *label) {
 340                 sprintf(spec, "LABEL=%s", label);
 341                 if (eval("mount", spec) == 0)
 342                         mnt = findmntents(dev_name, 0, NULL, 0);
 343         }
 344
 345         if (!mnt && uuid && *uuid) {
 346                 sprintf(spec, "UUID=%s", uuid);
 347                 if (eval("mount", spec) == 0)
 348                         mnt = findmntents(dev_name, 0, NULL, 0);
 349         }
 350
 351         if (!mnt) {
 352                 if (eval("mount", dev_name) == 0)
 353                         mnt = findmntents(dev_name, 0, NULL, 0);
 354         }
 355
 356         if (!mnt) {
 357                 /* Still did not find what we are looking for, try absolute path */
 358                 if (realpath(dev_name, spec)) {
 359                         if (eval("mount", spec) == 0)
 360                                 mnt = findmntents(dev_name, 0, NULL, 0);
 361                 }
 362         }
 363 #endif
 364
 365         if (mnt)
 366                 syslog(LOG_INFO, "USB %s fs at %s mounted on %s", type, dev_name, mnt->mnt_dir);
 367         return (mnt);
 368 }
 369
 370
 371 /* Check if the UFD is still connected because the links created in /dev/discs
 372  * are not removed when the UFD is  unplugged.
 373  * The file to read is: /proc/scsi/usb-storage-#/#, where # is the host no.
 374  * We are looking for "Attached: Yes".
 375  */
 376 static int usb_ufd_connected(int host_no)
 377 {
 378         char proc_file[128];
 379 #ifndef LINUX26
 380         char line[256];
 381 #endif
 382         FILE *fp;
 383
 384         sprintf(proc_file, "%s/%s-%d/%d", PROC_SCSI_ROOT, USB_STORAGE, host_no, host_no);
 385         fp = fopen(proc_file, "r");
 386
 387         if (!fp) {
 388                 /* try the way it's implemented in newer kernels: /proc/scsi/usb-storage/[host] */
 389                 sprintf(proc_file, "%s/%s/%d", PROC_SCSI_ROOT, USB_STORAGE, host_no);
 390                 fp = fopen(proc_file, "r");
 391         }
 392
 393         if (fp) {
 394 #ifdef LINUX26
 395                 fclose(fp);
 396                 return 1;
 397 #else
 398                 while (fgets(line, sizeof(line), fp) != NULL) {
 399                         if (strstr(line, "Attached: Yes")) {
 400                                 fclose(fp);
 401                                 return 1;
 402                         }
 403                 }
 404                 fclose(fp);
 405 #endif
 406         }
 407
 408         return 0;
 409 }
 410
 411
 412 #ifndef MNT_DETACH
 413 #define MNT_DETACH      0x00000002      /* from linux/fs.h - just detach from the tree */
 414 #endif
 415 int umount_mountpoint(struct mntent *mnt, uint flags);
 416 int uswap_mountpoint(struct mntent *mnt, uint flags);
 417
 418 /* Unmount this partition from all its mountpoints.  Note that it may
 419  * actually be mounted several times, either with different names or
 420  * with "-o bind" flag.
 421  * If the special flagfile is now revealed, delete it and [attempt to] delete
 422  * the directory.
 423  */
 424 int umount_partition(char *dev_name, int host_num, char *dsc_name, char *pt_name, uint flags)
 425 {
 426         sync(); /* This won't matter if the device is unplugged, though. */
 427
 428         if (flags & EFH_HUNKNOWN) {
 429                 /* EFH_HUNKNOWN flag is passed if the host was unknown.
 430                  * Only unmount disconnected drives in this case.
 431                  */
 432                 if (usb_ufd_connected(host_num))
 433                         return 0;
 434         }
 435
 436         /* Find all the active swaps that are on this device and stop them. */
 437         findmntents(dev_name, 1, uswap_mountpoint, flags);
 438
 439         /* Find all the mountpoints that are for this device and unmount them. */
 440         findmntents(dev_name, 0, umount_mountpoint, flags);
 441         return 0;
 442 }
 443
 444 int uswap_mountpoint(struct mntent *mnt, uint flags)
 445 {
 446         swapoff(mnt->mnt_fsname);
 447         return 0;
 448 }
 449
 450 int umount_mountpoint(struct mntent *mnt, uint flags)
 451 {
 452         int ret = 1, count;
 453         char flagfn[128];
 454
 455         sprintf(flagfn, "%s/.autocreated-dir", mnt->mnt_dir);
 456
 457         /* Run user pre-unmount scripts if any. It might be too late if
 458          * the drive has been disconnected, but we'll try it anyway.
 459          */
 460         if (nvram_get_int("usb_automount"))
 461                 run_nvscript("script_usbumount", mnt->mnt_dir, 3);
 462         /* Run *.autostop scripts located in the root of the partition being unmounted if any. */
 463         run_userfile(mnt->mnt_dir, ".autostop", mnt->mnt_dir, 5);
 464         run_nvscript("script_autostop", mnt->mnt_dir, 5);
 465
 466         count = 0;
 467         while ((ret = umount(mnt->mnt_dir)) && (count < 2)) {
 468                 count++;
 469                 /* If we could not unmount the drive on the 1st try,
 470                  * kill all NAS applications so they are not keeping the device busy -
 471                  * unless it's an unmount request from the Web GUI.
 472                  */
 473                 if ((count == 1) && ((flags & EFH_USER) == 0))
 474                         restart_nas_services(1, 0);
 475                 sleep(1);
 476         }
 477
 478         if (ret == 0)
 479                 syslog(LOG_INFO, "USB partition unmounted from %s", mnt->mnt_dir);
 480
 481         if (ret && ((flags & EFH_SHUTDN) != 0)) {
 482                 /* If system is stopping (not restarting), and we couldn't unmount the
 483                  * partition, try to remount it as read-only. Ignore the return code -
 484                  * we can still try to do a lazy unmount.
 485                  */
 486                 eval("mount", "-o", "remount,ro", mnt->mnt_dir);
 487         }
 488
 489         if (ret && ((flags & EFH_USER) == 0)) {
 490                 /* Make one more try to do a lazy unmount unless it's an unmount
 491                  * request from the Web GUI.
 492                  * MNT_DETACH will expose the underlying mountpoint directory to all
 493                  * except whatever has cd'ed to the mountpoint (thereby making it busy).
 494                  * So the unmount can't actually fail. It disappears from the ken of
 495                  * everyone else immediately, and from the ken of whomever is keeping it
 496                  * busy when they move away from it. And then it disappears for real.
 497                  */
 498                 ret = umount2(mnt->mnt_dir, MNT_DETACH);
 499                 syslog(LOG_INFO, "USB partition busy - will unmount ASAP from %s", mnt->mnt_dir);
 500         }
 501
 502         if (ret == 0) {
 503                 if ((unlink(flagfn) == 0)) {
 504                         // Only delete the directory if it was auto-created
 505                         rmdir(mnt->mnt_dir);
 506                 }
 507         }
 508         return (ret == 0);
 509 }
 510
 511
 512 /* Mount this partition on this disc.
 513  * If the device is already mounted on any mountpoint, don't mount it again.
 514  * If this is a swap partition, try swapon -a.
 515  * If this is a regular partition, try mount -a.
 516  *
 517  * Before we mount any partitions:
 518  *      If the type is swap and /etc/fstab exists, do "swapon -a"
 519  *      If /etc/fstab exists, try mounting using fstab.
 520  *  We delay invoking mount because mount will probe all the partitions
 521  *      to read the labels, and we don't want it to do that early on.
 522  *  We don't invoke swapon until we actually find a swap partition.
 523  *
 524  * If the mount succeeds, execute the *.autorun scripts in the top
 525  * directory of the newly mounted partition.
 526  * Returns NZ for success, 0 if we did not mount anything.
 527  */
 528 int mount_partition(char *dev_name, int host_num, char *dsc_name, char *pt_name, uint flags)
 529 {
 530         char the_label[128], mountpoint[128], uuid[40];
 531         int ret;
 532         char *type, *p;
 533         static char *swp_argv[] = { "swapon", "-a", NULL };
 534         struct mntent *mnt;
 535
 536         if ((type = find_label_or_uuid(dev_name, the_label, uuid)) == NULL)
 537                 return 0;
 538
 539         if (f_exists("/etc/fstab")) {
 540                 if (strcmp(type, "swap") == 0) {
 541                         _eval(swp_argv, NULL, 0, NULL);
 542                         return 0;
 543                 }
 544
 545                 if (mount_r(dev_name, NULL, NULL) == MOUNT_VAL_EXIST)
 546                         return 0;
 547
 548                 if ((mnt = mount_fstab(dev_name, type, the_label, uuid))) {
 549                         strcpy(mountpoint, mnt->mnt_dir);
 550                         ret = MOUNT_VAL_RW;
 551                         goto done;
 552                 }
 553         }
 554
 555         if (*the_label != 0) {
 556                 for (p = the_label; *p; p++) {
 557                         if (!isalnum(*p) && !strchr("+-&.@", *p))
 558                                 *p = '_';
 559                 }
 560                 sprintf(mountpoint, "%s/%s", MOUNT_ROOT, the_label);
 561                 if ((ret = mount_r(dev_name, mountpoint, type)))
 562                         goto done;
 563         }
 564
 565         /* Can't mount to /mnt/LABEL, so try mounting to /mnt/discDN_PN */
 566         sprintf(mountpoint, "%s/%s", MOUNT_ROOT, pt_name);
 567         ret = mount_r(dev_name, mountpoint, type);
 568 done:
 569         if (ret == MOUNT_VAL_RONLY || ret == MOUNT_VAL_RW)
 570         {
 571                 /* Run user *.autorun and post-mount scripts if any. */
 572                 run_userfile(mountpoint, ".autorun", mountpoint, 3);
 573                 if (nvram_get_int("usb_automount"))
 574                         run_nvscript("script_usbmount", mountpoint, 3);
 575         }
 576         return (ret == MOUNT_VAL_RONLY || ret == MOUNT_VAL_RW);
 577 }
 578
 579
 580 #if 0 /* LINUX26 */
 581
 582 /*
 583  * Finds SCSI Host number. Returns the host number >=0 if found, or (-1) otherwise.
 584  * The name and host number of scsi block device in kernel 2.6 (for attached devices) can be found as
 585  *      /sys($DEVPATH)/host<host_no>/target<*>/<id>/block:[sda|sdb|...]
 586  * where $DEVPATH is passed to hotplug events, and looks like
 587  *      /devices/pci0000:00/0000:00:04.1/usb1/1-1/1-1:1.2
 588  *
 589  * For printers this function finds a minor assigned to a printer
 590  *      /sys($DEVPATH)/usb:lp[0|1|2|...]
 591  */
 592 int find_dev_host(const char *devpath)
 593 {
 594         DIR *usb_devpath;
 595         struct dirent *dp;
 596         char buf[256];
 597         int host = -1;  /* Scsi Host */
 598
 599         sprintf(buf, "/sys%s", devpath);
 600         if ((usb_devpath = opendir(buf))) {
 601                 while ((dp = readdir(usb_devpath))) {
 602                         errno = 0;
 603                         if (strncmp(dp->d_name, "host", 4) == 0) {
 604                                 host = strtol(dp->d_name + 4, (char **)NULL, 10);
 605                                 if (errno)
 606                                         host = -1;
 607                                 else
 608                                         break;
 609                         }
 610                         else if (strncmp(dp->d_name, "usb:lp", 6) == 0) {
 611                                 host = strtol(dp->d_name + 6, (char **)NULL, 10);
 612                                 if (errno)
 613                                         host = -1;
 614                                 else
 615                                         break;
 616                         }
 617                         else
 618                                 continue;
 619                 }
 620                 closedir(usb_devpath);
 621         }
 622         return (host);
 623 }
 624
 625 #endif  /* LINUX26 */
 626
 627
 628 /* Mount or unmount all partitions on this controller.
 629  * Parameter: action_add:
 630  * 0  = unmount
 631  * >0 = mount only if automount config option is enabled.
 632  * <0 = mount regardless of config option.
 633  */
 634 void hotplug_usb_storage_device(int host_no, int action_add, uint flags)
 635 {
 636         if (!nvram_get_int("usb_enable"))
 637                 return;
 638         _dprintf("%s: host %d action: %d\n", __FUNCTION__, host_no, action_add);
 639
 640         if (action_add) {
 641                 if (nvram_get_int("usb_storage") && (nvram_get_int("usb_automount") || action_add < 0)) {
 642                         /* Do not probe the device here. It's either initiated by user,
 643                          * or hotplug_usb() already did.
 644                          */
 645                         if (exec_for_host(host_no, 0x00, flags, mount_partition)) {
 646                                 restart_nas_services(0, 1); // restart all NAS applications
 647                         }
 648                 }
 649         }
 650         else {
 651                 if (nvram_get_int("usb_storage") || ((flags & EFH_USER) == 0)) {
 652                         /* When unplugged, unmount the device even if
 653                          * usb storage is disabled in the GUI.
 654                          */
 655                         exec_for_host(host_no, (flags & EFH_USER) ? 0x00 : 0x02, flags, umount_partition);
 656                         /* Restart NAS applications (they could be killed by umount_mountpoint),
 657                          * or just re-read the configuration.
 658                          */
 659                         restart_nas_services(0, 1);
 660                 }
 661         }
 662 }
 663
 664
 665 /* This gets called at reboot or upgrade.  The system is stopping. */
 666 void remove_storage_main(int shutdn)
 667 {
 668         if (shutdn)
 669                 restart_nas_services(1, 0);
 670         /* Unmount all partitions */
 671         exec_for_host(-1, 0x02, shutdn ? EFH_SHUTDN : 0, umount_partition);
 672 }
 673
 674
 675 /*******
 676  * All the complex locking & checking code was removed when the kernel USB-storage
 677  * bugs were fixed.
 678  * The crash bug was with overlapped I/O to different USB drives, not specifically
 679  * with mount processing.
 680  *
 681  * And for USB devices that are slow to come up.  The kernel now waits until the
 682  * USB drive has settled, and it correctly reads the partition table before calling
 683  * the hotplug agent.
 684  *
 685  * The kernel patch was cleaning up data structures on an unplug.  It
 686  * needs to wait until the disk is unmounted.  We have 20 seconds to do
 687  * the unmounts.
 688  *******/
 689
 690
 691 /* Plugging or removing usb device
 692  *
 693  * On an occurrance, multiple hotplug events may be fired off.
 694  * For example, if a hub is plugged or unplugged, an event
 695  * will be generated for everything downstream of it, plus one for
 696  * the hub itself.  These are fired off simultaneously, not serially.
 697  * This means that many many hotplug processes will be running at
 698  * the same time.
 699  *
 700  * The hotplug event generated by the kernel gives us several pieces
 701  * of information:
 702  * PRODUCT is vendorid/productid/rev#.
 703  * DEVICE is /proc/bus/usb/bus#/dev#
 704  * ACTION is add or remove
 705  * SCSI_HOST is the host (controller) number (this relies on the custom kernel patch)
 706  *
 707  * Note that when we get a hotplug add event, the USB susbsystem may
 708  * or may not have yet tried to read the partition table of the
 709  * device.  For a new controller that has never been seen before,
 710  * generally yes.  For a re-plug of a controller that has been seen
 711  * before, generally no.
 712  *
 713  * On a remove, the partition info has not yet been expunged.  The
 714  * partitions show up as /dev/discs/disc#/part#, and /proc/partitions.
 715  * It appears that doing a "stat" for a non-existant partition will
 716  * causes the kernel to re-validate the device and update the
 717  * partition table info.  However, it won't re-validate if the disc is
 718  * mounted--you'll get a "Device busy for revalidation (usage=%d)" in
 719  * syslog.
 720  *
 721  * The $INTERFACE is "class/subclass/protocol"
 722  * Some interesting classes:
 723  *      8 = mass storage
 724  *      7 = printer
 725  *      3 = HID.   3/1/2 = mouse.
 726  *      6 = still image (6/1/1 = Digital camera Camera)
 727  *      9 = Hub
 728  *      255 = scanner (255/255/255)
 729  *
 730  * Observed:
 731  *      Hub seems to have no INTERFACE (null), and TYPE of "9/0/0"
 732  *      Flash disk seems to have INTERFACE of "8/6/80", and TYPE of "0/0/0"
 733  *
 734  * When a hub is unplugged, a hotplug event is generated for it and everything
 735  * downstream from it.  You cannot depend on getting these events in any
 736  * particular order, since there will be many hotplug programs all fired off
 737  * at almost the same time.
 738  * On a remove, don't try to access the downstream devices right away, give the
 739  * kernel time to finish cleaning up all the data structures, which will be
 740  * in the process of being torn down.
 741  *
 742  * On the initial plugin, the first time the kernel usb-storage subsystem sees
 743  * the host (identified by GUID), it automatically reads the partition table.
 744  * On subsequent plugins, it does not.
 745  *
 746  * Special values for Web Administration to unmount or remount
 747  * all partitions of the host:
 748  *      INTERFACE=TOMATO/...
 749  *      ACTION=add/remove
 750  *      SCSI_HOST=<host_no>
 751  * If host_no is negative, we unmount all partions of *all* hosts.
 752  */
 753 void hotplug_usb(void)
 754 {
 755         int add;
 756         int host = -1;
 757         char *interface = getenv("INTERFACE");
 758         char *action = getenv("ACTION");
 759         char *product = getenv("PRODUCT");
 760 #ifdef LINUX26
 761         char *device = getenv("DEVICENAME");
 762         int is_block = strcmp(getenv("SUBSYSTEM") ? : "", "block") == 0;
 763 #else
 764         char *device = getenv("DEVICE");
 765 #endif
 766         char *scsi_host = getenv("SCSI_HOST");
 767
 768         _dprintf("%s hotplug INTERFACE=%s ACTION=%s PRODUCT=%s HOST=%s DEVICE=%s\n",
 769                 getenv("SUBSYSTEM") ? : "USB", interface, action, product, scsi_host, device);
 770
 771         if (!nvram_get_int("usb_enable")) return;
 772 #ifdef LINUX26
 773         if (!action || ((!interface || !product) && !is_block))
 774 #else
 775         if (!interface || !action || !product)  /* Hubs bail out here. */
 776 #endif
 777                 return;
 778
 779         if (scsi_host)
 780                 host = atoi(scsi_host);
 781
 782         if (!wait_action_idle(10)) return;
 783
 784         add = (strcmp(action, "add") == 0);
 785         if (add && (strncmp(interface ? : "", "TOMATO/", 7) != 0)) {
 786 #ifdef LINUX26
 787                 if (!is_block && device)
 788 #endif
 789                 syslog(LOG_DEBUG, "Attached USB device %s [INTERFACE=%s PRODUCT=%s]",
 790                         device, interface, product);
 791 #ifndef LINUX26
 792                 /* To allow automount to be blocked on startup.
 793                  * In kernel 2.6 we still need to serialize mount/umount calls -
 794                  * so the lock is down below in the "block" hotplug processing.
 795                  */
 796                 file_unlock(file_lock("usb"));
 797 #endif
 798         }
 799
 800         if (strncmp(interface ? : "", "TOMATO/", 7) == 0) {     /* web admin */
 801                 if (scsi_host == NULL)
 802                         host = atoi(product);   // for backward compatibility
 803                 /* If host is negative, unmount all partitions of *all* hosts.
 804                  * If host == -1, execute "soft" unmount (do not kill NAS apps, no "lazy" umount).
 805                  * If host == -2, run "hard" unmount, as if the drive is unplugged.
 806                  * This feature can be used in custom scripts as following:
 807                  *
 808                  * # INTERFACE=TOMATO/1 ACTION=remove PRODUCT=-1 SCSI_HOST=-1 hotplug usb
 809                  *
 810                  * PRODUCT is required to pass the env variables verification.
 811                  */
 812                 /* Unmount or remount all partitions of the host. */
 813                 hotplug_usb_storage_device(host < 0 ? -1 : host, add ? -1 : 0,
 814                         host == -2 ? 0 : EFH_USER);
 815         }
 816 #ifdef LINUX26
 817         else if (is_block && strcmp(getenv("MAJOR") ? : "", "8") == 0 && strcmp(getenv("PHYSDEVBUS") ? : "", "scsi") == 0) {
 818                 /* scsi partition */
 819                 char devname[64];
 820                 int lock;
 821
 822                 sprintf(devname, "/dev/%s", device);
 823                 lock = file_lock("usb");
 824                 if (add) {
 825                         if (nvram_get_int("usb_storage") && nvram_get_int("usb_automount")) {
 826                                 int minor = atoi(getenv("MINOR") ? : "0");
 827                                 if ((minor % 16) == 0 && !is_no_partition(device)) {
 828                                         /* This is a disc, and not a "no-partition" device,
 829                                          * like APPLE iPOD shuffle. We can't mount it.
 830                                          */
 831                                         return;
 832                                 }
 833                                 if (mount_partition(devname, host, NULL, device, EFH_HP_ADD)) {
 834                                         restart_nas_services(0, 1); // restart all NAS applications
 835                                 }
 836                         }
 837                 }
 838                 else {
 839                         /* When unplugged, unmount the device even if usb storage is disabled in the GUI */
 840                         umount_partition(devname, host, NULL, device, EFH_HP_REMOVE);
 841                         /* Restart NAS applications (they could be killed by umount_mountpoint),
 842                          * or just re-read the configuration.
 843                          */
 844                         restart_nas_services(0, 1);
 845                 }
 846                 file_unlock(lock);
 847         }
 848 #endif
 849         else if (strncmp(interface ? : "", "8/", 2) == 0) {     /* usb storage */
 850                 run_nvscript("script_usbhotplug", NULL, 2);
 851 #ifndef LINUX26
 852                 hotplug_usb_storage_device(host, add, (add ? EFH_HP_ADD : EFH_HP_REMOVE) | (host < 0 ? EFH_HUNKNOWN : 0));
 853 #endif
 854         }
 855         else {  /* It's some other type of USB device, not storage. */
 856 #ifdef LINUX26
 857                 if (is_block) return;
 858 #endif
 859                 /* Do nothing.  The user's hotplug script must do it all. */
 860                 run_nvscript("script_usbhotplug", NULL, 2);
 861         }
 862 }
 863