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                         if (nvram_get_int("usb_fs_hfs")) {
 130                                 modprobe("hfs");
 131                         }
 132
 133                         if (nvram_get_int("usb_fs_hfsplus")) {
 134                                 modprobe("hfsplus");
 135                         }
 136                 }
 137
 138                 /* if enabled, force USB2 before USB1.1 */
 139                 if (nvram_get_int("usb_usb2") == 1) {
 140                         i = nvram_get_int("usb_irq_thresh");
 141                         if ((i < 0) || (i > 6))
 142                                 i = 0;
 143                         sprintf(param, "log2_irq_thresh=%d", i);
 144                         modprobe(USB20_MOD, param);
 145                 }
 146
 147                 if (nvram_get_int("usb_uhci") == 1) {
 148                         modprobe(USBUHCI_MOD);
 149                 }
 150
 151                 if (nvram_get_int("usb_ohci") == 1) {
 152                         modprobe(USBOHCI_MOD);
 153                 }
 154
 155                 if (nvram_get_int("usb_printer")) {
 156                         symlink("/dev/usb", "/dev/printers");
 157                         modprobe(USBPRINTER_MOD);
 158
 159                         /* start printer server only if not already running */
 160                         if (p9100d_sig(0) != 0) {
 161                                 eval("p910nd",
 162                                 nvram_get_int("usb_printer_bidirect") ? "-b" : "", //bidirectional
 163                                 "-f", "/dev/usb/lp0", // device
 164                                 "0" // listen port
 165                                 );
 166                         }
 167                 }
 168 #ifdef LINUX26
 169                 if (nvram_get_int("idle_enable") == 1) {
 170                         xstart( "sd-idle" );
 171                 }
 172
 173                 if (nvram_match( "usb_3g", "0") ) {
 174                         modprobe_r("usbserial");
 175                 }
 176 #endif
 177         }
 178 }
 179
 180 void stop_usb(void)
 181 {
 182         int disabled = !nvram_get_int("usb_enable");
 183
 184         // only find and kill the printer server we started (port 0)
 185         p9100d_sig(SIGTERM);
 186         modprobe_r(USBPRINTER_MOD);
 187
 188         // only stop storage services if disabled
 189         if (disabled || !nvram_get_int("usb_storage")) {
 190                 // Unmount all partitions
 191                 remove_storage_main(0);
 192
 193                 // Stop storage services
 194                 modprobe_r("ext2");
 195                 modprobe_r("ext3");
 196                 modprobe_r("jbd");
 197 #ifdef LINUX26
 198                 modprobe_r("mbcache");
 199 #endif
 200                 modprobe_r("vfat");
 201                 modprobe_r("fat");
 202                 modprobe_r("fuse");
 203                 modprobe_r("hfs");
 204                 modprobe_r("hfsplus");
 205                 sleep(1);
 206 #ifdef TCONFIG_SAMBASRV
 207                 modprobe_r("nls_cp437");
 208                 modprobe_r("nls_cp850");
 209                 modprobe_r("nls_cp852");
 210                 modprobe_r("nls_cp866");
 211 #ifdef LINUX26
 212                 modprobe_r("nls_cp932");
 213                 modprobe_r("nls_cp936");
 214                 modprobe_r("nls_cp949");
 215                 modprobe_r("nls_cp950");
 216 #endif
 217 #endif
 218                 modprobe_r(USBSTORAGE_MOD);
 219                 modprobe_r(SD_MOD);
 220 #ifdef LINUX26
 221                 modprobe_r(SCSI_WAIT_MOD);
 222 #endif
 223                 modprobe_r(SCSI_MOD);
 224         }
 225
 226         if (disabled || nvram_get_int("usb_ohci") != 1) modprobe_r(USBOHCI_MOD);
 227         if (disabled || nvram_get_int("usb_uhci") != 1) modprobe_r(USBUHCI_MOD);
 228         if (disabled || nvram_get_int("usb_usb2") != 1) modprobe_r(USB20_MOD);
 229
 230 #ifdef LINUX26
 231         modprobe_r("leds-usb");
 232         modprobe_r("ledtrig-usbdev");
 233         led(LED_USB, LED_OFF);
 234 #endif
 235
 236         // only unload core modules if usb is disabled
 237         if (disabled) {
 238                 umount("/proc/bus/usb"); // unmount usb device filesystem
 239                 modprobe_r(USBOHCI_MOD);
 240                 modprobe_r(USBUHCI_MOD);
 241                 modprobe_r(USB20_MOD);
 242                 modprobe_r(USBCORE_MOD);
 243         }
 244
 245 #ifdef LINUX26
 246         if (nvram_get_int("idle_enable") == 0) {
 247                 killall("sd-idle", SIGTERM);
 248         }
 249
 250         modprobe_r("usbserial");
 251 #endif
 252 }
 253
 254
 255 #define MOUNT_VAL_FAIL  0
 256 #define MOUNT_VAL_RONLY 1
 257 #define MOUNT_VAL_RW    2
 258 #define MOUNT_VAL_EXIST 3
 259
 260 int mount_r(char *mnt_dev, char *mnt_dir, char *type)
 261 {
 262         struct mntent *mnt;
 263         int ret;
 264         char options[140];
 265         char flagfn[128];
 266         int dir_made;
 267
 268         if ((mnt = findmntents(mnt_dev, 0, NULL, 0))) {
 269                 syslog(LOG_INFO, "USB partition at %s already mounted on %s",
 270                         mnt_dev, mnt->mnt_dir);
 271                 return MOUNT_VAL_EXIST;
 272         }
 273
 274         options[0] = 0;
 275
 276         if (type) {
 277                 unsigned long flags = MS_NOATIME | MS_NODEV;
 278
 279                 if (strcmp(type, "swap") == 0 || strcmp(type, "mbr") == 0) {
 280                         /* not a mountable partition */
 281                         flags = 0;
 282                 }
 283                 else if (strcmp(type, "ext2") == 0 || strcmp(type, "ext3") == 0) {
 284                         if (nvram_invmatch("usb_ext_opt", ""))
 285                                 sprintf(options, nvram_safe_get("usb_ext_opt"));
 286                 }
 287                 else if (strcmp(type, "vfat") == 0) {
 288                         if (nvram_invmatch("smbd_cset", ""))
 289                                 sprintf(options, "iocharset=%s%s",
 290                                         isdigit(nvram_get("smbd_cset")[0]) ? "cp" : "",
 291                                                 nvram_get("smbd_cset"));
 292                         if (nvram_invmatch("smbd_cpage", "")) {
 293                                 char *cp = nvram_safe_get("smbd_cpage");
 294                                 sprintf(options + strlen(options), ",codepage=%s" + (options[0] ? 0 : 1), cp);
 295                                 sprintf(flagfn, "nls_cp%s", cp);
 296
 297                                 cp = nvram_get("smbd_nlsmod");
 298                                 if ((cp) && (*cp != 0) && (strcmp(cp, flagfn) != 0))
 299                                         modprobe_r(cp);
 300
 301                                 modprobe(flagfn);
 302                                 nvram_set("smbd_nlsmod", flagfn);
 303                         }
 304                         sprintf(options + strlen(options), ",shortname=winnt" + (options[0] ? 0 : 1));
 305 #ifdef LINUX26
 306                         sprintf(options + strlen(options), ",flush" + (options[0] ? 0 : 1));
 307 #endif
 308                         if (nvram_invmatch("usb_fat_opt", ""))
 309                                 sprintf(options + strlen(options), "%s%s", options[0] ? "," : "", nvram_safe_get("usb_fat_opt"));
 310                 }
 311                 else if (strncmp(type, "ntfs", 4) == 0) {
 312                         if (nvram_invmatch("smbd_cset", ""))
 313                                 sprintf(options, "iocharset=%s%s",
 314                                         isdigit(nvram_get("smbd_cset")[0]) ? "cp" : "",
 315                                                 nvram_get("smbd_cset"));
 316                         if (nvram_invmatch("usb_ntfs_opt", ""))
 317                                 sprintf(options + strlen(options), "%s%s", options[0] ? "," : "", nvram_safe_get("usb_ntfs_opt"));
 318                 }
 319
 320                 if (flags) {
 321                         if ((dir_made = mkdir_if_none(mnt_dir))) {
 322                                 /* Create the flag file for remove the directory on dismount. */
 323                                 sprintf(flagfn, "%s/.autocreated-dir", mnt_dir);
 324                                 f_write(flagfn, NULL, 0, 0, 0);
 325                         }
 326
 327                         ret = mount(mnt_dev, mnt_dir, type, flags, options[0] ? options : "");
 328
 329                         /* try ntfs-3g in case it's installed */
 330                         if (ret != 0 && strncmp(type, "ntfs", 4) == 0) {
 331                                 sprintf(options + strlen(options), ",noatime,nodev" + (options[0] ? 0 : 1));
 332 #ifdef TCONFIG_NTFS
 333                                 if (nvram_get_int("usb_fs_ntfs"))
 334 #endif
 335                                         ret = eval("ntfs-3g", "-o", options, mnt_dev, mnt_dir);
 336                         }
 337
 338                         if (ret != 0 && strncmp(type, "hfs", "") == 0) {
 339                                 ret = eval("mount", "-o", "noatime,nodev", mnt_dev, mnt_dir);
 340                         }
 341
 342                         if (ret != 0 && strncmp(type, "hfsplus", "") == 0) {
 343                                 ret = eval("mount", "-o", "noatime,nodev", mnt_dev, mnt_dir);
 344                         }
 345
 346                         if (ret != 0) /* give it another try - guess fs */
 347                                 ret = eval("mount", "-o", "noatime,nodev", mnt_dev, mnt_dir);
 348
 349                         if (ret == 0) {
 350                                 syslog(LOG_INFO, "USB %s%s fs at %s mounted on %s",
 351                                         type, (flags & MS_RDONLY) ? " (ro)" : "", mnt_dev, mnt_dir);
 352                                 return (flags & MS_RDONLY) ? MOUNT_VAL_RONLY : MOUNT_VAL_RW;
 353                         }
 354
 355                         if (dir_made) {
 356                                 unlink(flagfn);
 357                                 rmdir(mnt_dir);
 358                         }
 359                 }
 360         }
 361         return MOUNT_VAL_FAIL;
 362 }
 363
 364
 365 struct mntent *mount_fstab(char *dev_name, char *type, char *label, char *uuid)
 366 {
 367         struct mntent *mnt = NULL;
 368 #if 0
 369         if (eval("mount", "-a") == 0)
 370                 mnt = findmntents(dev_name, 0, NULL, 0);
 371 #else
 372         char spec[PATH_MAX+1];
 373
 374         if (label && *label) {
 375                 sprintf(spec, "LABEL=%s", label);
 376                 if (eval("mount", spec) == 0)
 377                         mnt = findmntents(dev_name, 0, NULL, 0);
 378         }
 379
 380         if (!mnt && uuid && *uuid) {
 381                 sprintf(spec, "UUID=%s", uuid);
 382                 if (eval("mount", spec) == 0)
 383                         mnt = findmntents(dev_name, 0, NULL, 0);
 384         }
 385
 386         if (!mnt) {
 387                 if (eval("mount", dev_name) == 0)
 388                         mnt = findmntents(dev_name, 0, NULL, 0);
 389         }
 390
 391         if (!mnt) {
 392                 /* Still did not find what we are looking for, try absolute path */
 393                 if (realpath(dev_name, spec)) {
 394                         if (eval("mount", spec) == 0)
 395                                 mnt = findmntents(dev_name, 0, NULL, 0);
 396                 }
 397         }
 398 #endif
 399
 400         if (mnt)
 401                 syslog(LOG_INFO, "USB %s fs at %s mounted on %s", type, dev_name, mnt->mnt_dir);
 402         return (mnt);
 403 }
 404
 405
 406 /* Check if the UFD is still connected because the links created in /dev/discs
 407  * are not removed when the UFD is  unplugged.
 408  * The file to read is: /proc/scsi/usb-storage-#/#, where # is the host no.
 409  * We are looking for "Attached: Yes".
 410  */
 411 static int usb_ufd_connected(int host_no)
 412 {
 413         char proc_file[128];
 414 #ifndef LINUX26
 415         char line[256];
 416 #endif
 417         FILE *fp;
 418
 419         sprintf(proc_file, "%s/%s-%d/%d", PROC_SCSI_ROOT, USB_STORAGE, host_no, host_no);
 420         fp = fopen(proc_file, "r");
 421
 422         if (!fp) {
 423                 /* try the way it's implemented in newer kernels: /proc/scsi/usb-storage/[host] */
 424                 sprintf(proc_file, "%s/%s/%d", PROC_SCSI_ROOT, USB_STORAGE, host_no);
 425                 fp = fopen(proc_file, "r");
 426         }
 427
 428         if (fp) {
 429 #ifdef LINUX26
 430                 fclose(fp);
 431                 return 1;
 432 #else
 433                 while (fgets(line, sizeof(line), fp) != NULL) {
 434                         if (strstr(line, "Attached: Yes")) {
 435                                 fclose(fp);
 436                                 return 1;
 437                         }
 438                 }
 439                 fclose(fp);
 440 #endif
 441         }
 442
 443         return 0;
 444 }
 445
 446
 447 #ifndef MNT_DETACH
 448 #define MNT_DETACH      0x00000002      /* from linux/fs.h - just detach from the tree */
 449 #endif
 450 int umount_mountpoint(struct mntent *mnt, uint flags);
 451 int uswap_mountpoint(struct mntent *mnt, uint flags);
 452
 453 /* Unmount this partition from all its mountpoints.  Note that it may
 454  * actually be mounted several times, either with different names or
 455  * with "-o bind" flag.
 456  * If the special flagfile is now revealed, delete it and [attempt to] delete
 457  * the directory.
 458  */
 459 int umount_partition(char *dev_name, int host_num, char *dsc_name, char *pt_name, uint flags)
 460 {
 461         sync(); /* This won't matter if the device is unplugged, though. */
 462
 463         if (flags & EFH_HUNKNOWN) {
 464                 /* EFH_HUNKNOWN flag is passed if the host was unknown.
 465                  * Only unmount disconnected drives in this case.
 466                  */
 467                 if (usb_ufd_connected(host_num))
 468                         return 0;
 469         }
 470
 471         /* Find all the active swaps that are on this device and stop them. */
 472         findmntents(dev_name, 1, uswap_mountpoint, flags);
 473
 474         /* Find all the mountpoints that are for this device and unmount them. */
 475         findmntents(dev_name, 0, umount_mountpoint, flags);
 476         return 0;
 477 }
 478
 479 int uswap_mountpoint(struct mntent *mnt, uint flags)
 480 {
 481         swapoff(mnt->mnt_fsname);
 482         return 0;
 483 }
 484
 485 int umount_mountpoint(struct mntent *mnt, uint flags)
 486 {
 487         int ret = 1, count;
 488         char flagfn[128];
 489
 490         sprintf(flagfn, "%s/.autocreated-dir", mnt->mnt_dir);
 491
 492         /* Run user pre-unmount scripts if any. It might be too late if
 493          * the drive has been disconnected, but we'll try it anyway.
 494          */
 495         if (nvram_get_int("usb_automount"))
 496                 run_nvscript("script_usbumount", mnt->mnt_dir, 3);
 497         /* Run *.autostop scripts located in the root of the partition being unmounted if any. */
 498         run_userfile(mnt->mnt_dir, ".autostop", mnt->mnt_dir, 5);
 499         run_nvscript("script_autostop", mnt->mnt_dir, 5);
 500
 501         count = 0;
 502         while ((ret = umount(mnt->mnt_dir)) && (count < 2)) {
 503                 count++;
 504                 /* If we could not unmount the drive on the 1st try,
 505                  * kill all NAS applications so they are not keeping the device busy -
 506                  * unless it's an unmount request from the Web GUI.
 507                  */
 508                 if ((count == 1) && ((flags & EFH_USER) == 0))
 509                         restart_nas_services(1, 0);
 510                 sleep(1);
 511         }
 512
 513         if (ret == 0)
 514                 syslog(LOG_INFO, "USB partition unmounted from %s", mnt->mnt_dir);
 515
 516         if (ret && ((flags & EFH_SHUTDN) != 0)) {
 517                 /* If system is stopping (not restarting), and we couldn't unmount the
 518                  * partition, try to remount it as read-only. Ignore the return code -
 519                  * we can still try to do a lazy unmount.
 520                  */
 521                 eval("mount", "-o", "remount,ro", mnt->mnt_dir);
 522         }
 523
 524         if (ret && ((flags & EFH_USER) == 0)) {
 525                 /* Make one more try to do a lazy unmount unless it's an unmount
 526                  * request from the Web GUI.
 527                  * MNT_DETACH will expose the underlying mountpoint directory to all
 528                  * except whatever has cd'ed to the mountpoint (thereby making it busy).
 529                  * So the unmount can't actually fail. It disappears from the ken of
 530                  * everyone else immediately, and from the ken of whomever is keeping it
 531                  * busy when they move away from it. And then it disappears for real.
 532                  */
 533                 ret = umount2(mnt->mnt_dir, MNT_DETACH);
 534                 syslog(LOG_INFO, "USB partition busy - will unmount ASAP from %s", mnt->mnt_dir);
 535         }
 536
 537         if (ret == 0) {
 538                 if ((unlink(flagfn) == 0)) {
 539                         // Only delete the directory if it was auto-created
 540                         rmdir(mnt->mnt_dir);
 541                 }
 542         }
 543         return (ret == 0);
 544 }
 545
 546
 547 /* Mount this partition on this disc.
 548  * If the device is already mounted on any mountpoint, don't mount it again.
 549  * If this is a swap partition, try swapon -a.
 550  * If this is a regular partition, try mount -a.
 551  *
 552  * Before we mount any partitions:
 553  *      If the type is swap and /etc/fstab exists, do "swapon -a"
 554  *      If /etc/fstab exists, try mounting using fstab.
 555  *  We delay invoking mount because mount will probe all the partitions
 556  *      to read the labels, and we don't want it to do that early on.
 557  *  We don't invoke swapon until we actually find a swap partition.
 558  *
 559  * If the mount succeeds, execute the *.autorun scripts in the top
 560  * directory of the newly mounted partition.
 561  * Returns NZ for success, 0 if we did not mount anything.
 562  */
 563 int mount_partition(char *dev_name, int host_num, char *dsc_name, char *pt_name, uint flags)
 564 {
 565         char the_label[128], mountpoint[128], uuid[40];
 566         int ret;
 567         char *type, *p;
 568         static char *swp_argv[] = { "swapon", "-a", NULL };
 569         struct mntent *mnt;
 570
 571         if ((type = find_label_or_uuid(dev_name, the_label, uuid)) == NULL)
 572                 return 0;
 573
 574         if (f_exists("/etc/fstab")) {
 575                 if (strcmp(type, "swap") == 0) {
 576                         _eval(swp_argv, NULL, 0, NULL);
 577                         return 0;
 578                 }
 579
 580                 if (mount_r(dev_name, NULL, NULL) == MOUNT_VAL_EXIST)
 581                         return 0;
 582
 583                 if ((mnt = mount_fstab(dev_name, type, the_label, uuid))) {
 584                         strcpy(mountpoint, mnt->mnt_dir);
 585                         ret = MOUNT_VAL_RW;
 586                         goto done;
 587                 }
 588         }
 589
 590         if (*the_label != 0) {
 591                 for (p = the_label; *p; p++) {
 592                         if (!isalnum(*p) && !strchr("+-&.@", *p))
 593                                 *p = '_';
 594                 }
 595                 sprintf(mountpoint, "%s/%s", MOUNT_ROOT, the_label);
 596                 if ((ret = mount_r(dev_name, mountpoint, type)))
 597                         goto done;
 598         }
 599
 600         /* Can't mount to /mnt/LABEL, so try mounting to /mnt/discDN_PN */
 601         sprintf(mountpoint, "%s/%s", MOUNT_ROOT, pt_name);
 602         ret = mount_r(dev_name, mountpoint, type);
 603 done:
 604         if (ret == MOUNT_VAL_RONLY || ret == MOUNT_VAL_RW)
 605         {
 606                 /* Run user *.autorun and post-mount scripts if any. */
 607                 run_userfile(mountpoint, ".autorun", mountpoint, 3);
 608                 if (nvram_get_int("usb_automount"))
 609                         run_nvscript("script_usbmount", mountpoint, 3);
 610         }
 611         return (ret == MOUNT_VAL_RONLY || ret == MOUNT_VAL_RW);
 612 }
 613
 614
 615 #if 0 /* LINUX26 */
 616
 617 /*
 618  * Finds SCSI Host number. Returns the host number >=0 if found, or (-1) otherwise.
 619  * The name and host number of scsi block device in kernel 2.6 (for attached devices) can be found as
 620  *      /sys($DEVPATH)/host<host_no>/target<*>/<id>/block:[sda|sdb|...]
 621  * where $DEVPATH is passed to hotplug events, and looks like
 622  *      /devices/pci0000:00/0000:00:04.1/usb1/1-1/1-1:1.2
 623  *
 624  * For printers this function finds a minor assigned to a printer
 625  *      /sys($DEVPATH)/usb:lp[0|1|2|...]
 626  */
 627 int find_dev_host(const char *devpath)
 628 {
 629         DIR *usb_devpath;
 630         struct dirent *dp;
 631         char buf[256];
 632         int host = -1;  /* Scsi Host */
 633
 634         sprintf(buf, "/sys%s", devpath);
 635         if ((usb_devpath = opendir(buf))) {
 636                 while ((dp = readdir(usb_devpath))) {
 637                         errno = 0;
 638                         if (strncmp(dp->d_name, "host", 4) == 0) {
 639                                 host = strtol(dp->d_name + 4, (char **)NULL, 10);
 640                                 if (errno)
 641                                         host = -1;
 642                                 else
 643                                         break;
 644                         }
 645                         else if (strncmp(dp->d_name, "usb:lp", 6) == 0) {
 646                                 host = strtol(dp->d_name + 6, (char **)NULL, 10);
 647                                 if (errno)
 648                                         host = -1;
 649                                 else
 650                                         break;
 651                         }
 652                         else
 653                                 continue;
 654                 }
 655                 closedir(usb_devpath);
 656         }
 657         return (host);
 658 }
 659
 660 #endif  /* LINUX26 */
 661
 662 int dir_is_mountpoint(const char *root, const char *dir)
 663 {
 664         char path[256];
 665         struct stat sb;
 666         int thisdev;
 667
 668         snprintf(path, sizeof(path), "%s%s%s", root ? : "", root ? "/" : "", dir);
 669
 670         /* Check if this is a directory */
 671         sb.st_mode = S_IFDIR;   /* failsafe */
 672         stat(path, &sb);
 673
 674         if (S_ISDIR(sb.st_mode)) {
 675
 676                 /* If this dir & its parent dir are on the same device, it is not a mountpoint */
 677                 strcat(path, "/.");
 678                 stat(path, &sb);
 679                 thisdev = sb.st_dev;
 680                 strcat(path, ".");
 681                 ++sb.st_dev;    /* failsafe */
 682                 stat(path, &sb);
 683
 684                 return (thisdev != sb.st_dev);
 685         }
 686
 687         return 0;
 688 }
 689
 690 /* Mount or unmount all partitions on this controller.
 691  * Parameter: action_add:
 692  * 0  = unmount
 693  * >0 = mount only if automount config option is enabled.
 694  * <0 = mount regardless of config option.
 695  */
 696 void hotplug_usb_storage_device(int host_no, int action_add, uint flags)
 697 {
 698         if (!nvram_get_int("usb_enable"))
 699                 return;
 700         _dprintf("%s: host %d action: %d\n", __FUNCTION__, host_no, action_add);
 701
 702         if (action_add) {
 703                 if (nvram_get_int("usb_storage") && (nvram_get_int("usb_automount") || action_add < 0)) {
 704                         /* Do not probe the device here. It's either initiated by user,
 705                          * or hotplug_usb() already did.
 706                          */
 707                         if (exec_for_host(host_no, 0x00, flags, mount_partition)) {
 708                                 restart_nas_services(0, 1); // restart all NAS applications
 709                         }
 710                 }
 711         }
 712         else {
 713                 if (nvram_get_int("usb_storage") || ((flags & EFH_USER) == 0)) {
 714                         /* When unplugged, unmount the device even if
 715                          * usb storage is disabled in the GUI.
 716                          */
 717                         exec_for_host(host_no, (flags & EFH_USER) ? 0x00 : 0x02, flags, umount_partition);
 718                         /* Restart NAS applications (they could be killed by umount_mountpoint),
 719                          * or just re-read the configuration.
 720                          */
 721                         restart_nas_services(0, 1);
 722                 }
 723         }
 724 }
 725
 726
 727 /* This gets called at reboot or upgrade.  The system is stopping. */
 728 void remove_storage_main(int shutdn)
 729 {
 730         if (shutdn)
 731                 restart_nas_services(1, 0);
 732         /* Unmount all partitions */
 733         exec_for_host(-1, 0x02, shutdn ? EFH_SHUTDN : 0, umount_partition);
 734 }
 735
 736
 737 /*******
 738  * All the complex locking & checking code was removed when the kernel USB-storage
 739  * bugs were fixed.
 740  * The crash bug was with overlapped I/O to different USB drives, not specifically
 741  * with mount processing.
 742  *
 743  * And for USB devices that are slow to come up.  The kernel now waits until the
 744  * USB drive has settled, and it correctly reads the partition table before calling
 745  * the hotplug agent.
 746  *
 747  * The kernel patch was cleaning up data structures on an unplug.  It
 748  * needs to wait until the disk is unmounted.  We have 20 seconds to do
 749  * the unmounts.
 750  *******/
 751
 752
 753 /* Plugging or removing usb device
 754  *
 755  * On an occurrance, multiple hotplug events may be fired off.
 756  * For example, if a hub is plugged or unplugged, an event
 757  * will be generated for everything downstream of it, plus one for
 758  * the hub itself.  These are fired off simultaneously, not serially.
 759  * This means that many many hotplug processes will be running at
 760  * the same time.
 761  *
 762  * The hotplug event generated by the kernel gives us several pieces
 763  * of information:
 764  * PRODUCT is vendorid/productid/rev#.
 765  * DEVICE is /proc/bus/usb/bus#/dev#
 766  * ACTION is add or remove
 767  * SCSI_HOST is the host (controller) number (this relies on the custom kernel patch)
 768  *
 769  * Note that when we get a hotplug add event, the USB susbsystem may
 770  * or may not have yet tried to read the partition table of the
 771  * device.  For a new controller that has never been seen before,
 772  * generally yes.  For a re-plug of a controller that has been seen
 773  * before, generally no.
 774  *
 775  * On a remove, the partition info has not yet been expunged.  The
 776  * partitions show up as /dev/discs/disc#/part#, and /proc/partitions.
 777  * It appears that doing a "stat" for a non-existant partition will
 778  * causes the kernel to re-validate the device and update the
 779  * partition table info.  However, it won't re-validate if the disc is
 780  * mounted--you'll get a "Device busy for revalidation (usage=%d)" in
 781  * syslog.
 782  *
 783  * The $INTERFACE is "class/subclass/protocol"
 784  * Some interesting classes:
 785  *      8 = mass storage
 786  *      7 = printer
 787  *      3 = HID.   3/1/2 = mouse.
 788  *      6 = still image (6/1/1 = Digital camera Camera)
 789  *      9 = Hub
 790  *      255 = scanner (255/255/255)
 791  *
 792  * Observed:
 793  *      Hub seems to have no INTERFACE (null), and TYPE of "9/0/0"
 794  *      Flash disk seems to have INTERFACE of "8/6/80", and TYPE of "0/0/0"
 795  *
 796  * When a hub is unplugged, a hotplug event is generated for it and everything
 797  * downstream from it.  You cannot depend on getting these events in any
 798  * particular order, since there will be many hotplug programs all fired off
 799  * at almost the same time.
 800  * On a remove, don't try to access the downstream devices right away, give the
 801  * kernel time to finish cleaning up all the data structures, which will be
 802  * in the process of being torn down.
 803  *
 804  * On the initial plugin, the first time the kernel usb-storage subsystem sees
 805  * the host (identified by GUID), it automatically reads the partition table.
 806  * On subsequent plugins, it does not.
 807  *
 808  * Special values for Web Administration to unmount or remount
 809  * all partitions of the host:
 810  *      INTERFACE=TOMATO/...
 811  *      ACTION=add/remove
 812  *      SCSI_HOST=<host_no>
 813  * If host_no is negative, we unmount all partions of *all* hosts.
 814  */
 815 void hotplug_usb(void)
 816 {
 817         int add;
 818         int host = -1;
 819         char *interface = getenv("INTERFACE");
 820         char *action = getenv("ACTION");
 821         char *product = getenv("PRODUCT");
 822 #ifdef LINUX26
 823         char *device = getenv("DEVICENAME");
 824         int is_block = strcmp(getenv("SUBSYSTEM") ? : "", "block") == 0;
 825 #else
 826         char *device = getenv("DEVICE");
 827 #endif
 828         char *scsi_host = getenv("SCSI_HOST");
 829
 830         _dprintf("%s hotplug INTERFACE=%s ACTION=%s PRODUCT=%s HOST=%s DEVICE=%s\n",
 831                 getenv("SUBSYSTEM") ? : "USB", interface, action, product, scsi_host, device);
 832
 833         if (!nvram_get_int("usb_enable")) return;
 834 #ifdef LINUX26
 835         if (!action || ((!interface || !product) && !is_block))
 836 #else
 837         if (!interface || !action || !product)  /* Hubs bail out here. */
 838 #endif
 839                 return;
 840
 841         if (scsi_host)
 842                 host = atoi(scsi_host);
 843
 844         if (!wait_action_idle(10)) return;
 845
 846         add = (strcmp(action, "add") == 0);
 847         if (add && (strncmp(interface ? : "", "TOMATO/", 7) != 0)) {
 848 #ifdef LINUX26
 849                 if (!is_block && device)
 850 #endif
 851                 syslog(LOG_DEBUG, "Attached USB device %s [INTERFACE=%s PRODUCT=%s]",
 852                         device, interface, product);
 853 #ifndef LINUX26
 854                 /* To allow automount to be blocked on startup.
 855                  * In kernel 2.6 we still need to serialize mount/umount calls -
 856                  * so the lock is down below in the "block" hotplug processing.
 857                  */
 858                 file_unlock(file_lock("usb"));
 859 #endif
 860         }
 861
 862         if (strncmp(interface ? : "", "TOMATO/", 7) == 0) {     /* web admin */
 863                 if (scsi_host == NULL)
 864                         host = atoi(product);   // for backward compatibility
 865                 /* If host is negative, unmount all partitions of *all* hosts.
 866                  * If host == -1, execute "soft" unmount (do not kill NAS apps, no "lazy" umount).
 867                  * If host == -2, run "hard" unmount, as if the drive is unplugged.
 868                  * This feature can be used in custom scripts as following:
 869                  *
 870                  * # INTERFACE=TOMATO/1 ACTION=remove PRODUCT=-1 SCSI_HOST=-1 hotplug usb
 871                  *
 872                  * PRODUCT is required to pass the env variables verification.
 873                  */
 874                 /* Unmount or remount all partitions of the host. */
 875                 hotplug_usb_storage_device(host < 0 ? -1 : host, add ? -1 : 0,
 876                         host == -2 ? 0 : EFH_USER);
 877         }
 878 #ifdef LINUX26
 879         else if (is_block && strcmp(getenv("MAJOR") ? : "", "8") == 0 && strcmp(getenv("PHYSDEVBUS") ? : "", "scsi") == 0) {
 880                 /* scsi partition */
 881                 char devname[64];
 882                 int lock;
 883
 884                 sprintf(devname, "/dev/%s", device);
 885                 lock = file_lock("usb");
 886                 if (add) {
 887                         if (nvram_get_int("usb_storage") && nvram_get_int("usb_automount")) {
 888                                 int minor = atoi(getenv("MINOR") ? : "0");
 889                                 if ((minor % 16) == 0 && !is_no_partition(device)) {
 890                                         /* This is a disc, and not a "no-partition" device,
 891                                          * like APPLE iPOD shuffle. We can't mount it.
 892                                          */
 893                                         return;
 894                                 }
 895                                 if (mount_partition(devname, host, NULL, device, EFH_HP_ADD)) {
 896                                         restart_nas_services(0, 1); // restart all NAS applications
 897                                 }
 898                         }
 899                 }
 900                 else {
 901                         /* When unplugged, unmount the device even if usb storage is disabled in the GUI */
 902                         umount_partition(devname, host, NULL, device, EFH_HP_REMOVE);
 903                         /* Restart NAS applications (they could be killed by umount_mountpoint),
 904                          * or just re-read the configuration.
 905                          */
 906                         restart_nas_services(0, 1);
 907                 }
 908                 file_unlock(lock);
 909         }
 910 #endif
 911         else if (strncmp(interface ? : "", "8/", 2) == 0) {     /* usb storage */
 912                 run_nvscript("script_usbhotplug", NULL, 2);
 913 #ifndef LINUX26
 914                 hotplug_usb_storage_device(host, add, (add ? EFH_HP_ADD : EFH_HP_REMOVE) | (host < 0 ? EFH_HUNKNOWN : 0));
 915 #endif
 916         }
 917         else {  /* It's some other type of USB device, not storage. */
 918 #ifdef LINUX26
 919                 if (is_block) return;
 920 #endif
 921                 /* Do nothing.  The user's hotplug script must do it all. */
 922                 run_nvscript("script_usbhotplug", NULL, 2);
 923         }
 924 }
 925