dlls/mountmgr.sys/device.c

   1 /*
   2  * Dynamic devices support
   3  *
   4  * Copyright 2006 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <errno.h>
  26 #include <stdarg.h>
  27 #include <stdio.h>
  28 #include <sys/time.h>
  29
  30 #include "mountmgr.h"
  31 #include "winreg.h"
  32 #include "winuser.h"
  33 #include "dbt.h"
  34
  35 #include "wine/library.h"
  36 #include "wine/list.h"
  37 #include "wine/unicode.h"
  38 #include "wine/debug.h"
  39
  40 WINE_DEFAULT_DEBUG_CHANNEL(mountmgr);
  41
  42 #define MAX_DOS_DRIVES 26
  43
  44 static const WCHAR drive_types[][8] =
  45 {
  46     { 0 },                           /* DEVICE_UNKNOWN */
  47     { 0 },                           /* DEVICE_HARDDISK */
  48     {'h','d',0},                     /* DEVICE_HARDDISK_VOL */
  49     {'f','l','o','p','p','y',0},     /* DEVICE_FLOPPY */
  50     {'c','d','r','o','m',0},         /* DEVICE_CDROM */
  51     {'n','e','t','w','o','r','k',0}, /* DEVICE_NETWORK */
  52     {'r','a','m','d','i','s','k',0}  /* DEVICE_RAMDISK */
  53 };
  54
  55 static const WCHAR drives_keyW[] = {'S','o','f','t','w','a','r','e','\\',
  56                                     'W','i','n','e','\\','D','r','i','v','e','s',0};
  57
  58 struct disk_device
  59 {
  60     enum device_type      type;        /* drive type */
  61     DEVICE_OBJECT        *dev_obj;     /* disk device allocated for this volume */
  62     UNICODE_STRING        name;        /* device name */
  63     UNICODE_STRING        symlink;     /* device symlink if any */
  64     STORAGE_DEVICE_NUMBER devnum;      /* device number info */
  65     char                 *unix_device; /* unix device path */
  66     char                 *unix_mount;  /* unix mount point path */
  67 };
  68
  69 struct volume
  70 {
  71     struct list           entry;       /* entry in volumes list */
  72     struct disk_device   *device;      /* disk device */
  73     char                 *udi;         /* unique identifier for dynamic volumes */
  74     unsigned int          ref;         /* ref count */
  75     GUID                  guid;        /* volume uuid */
  76     struct mount_point   *mount;       /* Volume{xxx} mount point */
  77 };
  78
  79 struct dos_drive
  80 {
  81     struct list           entry;       /* entry in drives list */
  82     struct volume        *volume;      /* volume for this drive */
  83     int                   drive;       /* drive letter (0 = A: etc.) */
  84     struct mount_point   *mount;       /* DosDevices mount point */
  85 };
  86
  87 static struct list drives_list = LIST_INIT(drives_list);
  88 static struct list volumes_list = LIST_INIT(volumes_list);
  89
  90 static DRIVER_OBJECT *harddisk_driver;
  91
  92 static CRITICAL_SECTION device_section;
  93 static CRITICAL_SECTION_DEBUG critsect_debug =
  94 {
  95     0, 0, &device_section,
  96     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  97       0, 0, { (DWORD_PTR)(__FILE__ ": device_section") }
  98 };
  99 static CRITICAL_SECTION device_section = { &critsect_debug, -1, 0, 0, 0, 0 };
 100
 101 static char *get_dosdevices_path( char **drive )
 102 {
 103     const char *config_dir = wine_get_config_dir();
 104     size_t len = strlen(config_dir) + sizeof("/dosdevices/a::");
 105     char *path = HeapAlloc( GetProcessHeap(), 0, len );
 106     if (path)
 107     {
 108         strcpy( path, config_dir );
 109         strcat( path, "/dosdevices/a::" );
 110         *drive = path + len - 4;
 111     }
 112     return path;
 113 }
 114
 115 static char *strdupA( const char *str )
 116 {
 117     char *ret;
 118
 119     if (!str) return NULL;
 120     if ((ret = RtlAllocateHeap( GetProcessHeap(), 0, strlen(str) + 1 ))) strcpy( ret, str );
 121     return ret;
 122 }
 123
 124 static const GUID *get_default_uuid( int letter )
 125 {
 126     static GUID guid;
 127
 128     guid.Data4[7] = 'A' + letter;
 129     return &guid;
 130 }
 131
 132 /* read a Unix symlink; returned buffer must be freed by caller */
 133 static char *read_symlink( const char *path )
 134 {
 135     char *buffer;
 136     int ret, size = 128;
 137
 138     for (;;)
 139     {
 140         if (!(buffer = RtlAllocateHeap( GetProcessHeap(), 0, size )))
 141         {
 142             SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 143             return 0;
 144         }
 145         ret = readlink( path, buffer, size );
 146         if (ret == -1)
 147         {
 148             RtlFreeHeap( GetProcessHeap(), 0, buffer );
 149             return 0;
 150         }
 151         if (ret != size)
 152         {
 153             buffer[ret] = 0;
 154             return buffer;
 155         }
 156         RtlFreeHeap( GetProcessHeap(), 0, buffer );
 157         size *= 2;
 158     }
 159 }
 160
 161 /* update a symlink if it changed; return TRUE if updated */
 162 static void update_symlink( const char *path, const char *dest, const char *orig_dest )
 163 {
 164     if (dest && dest[0])
 165     {
 166         if (!orig_dest || strcmp( orig_dest, dest ))
 167         {
 168             unlink( path );
 169             symlink( dest, path );
 170         }
 171     }
 172     else unlink( path );
 173 }
 174
 175 /* send notification about a change to a given drive */
 176 static void send_notify( int drive, int code )
 177 {
 178     DWORD_PTR result;
 179     DEV_BROADCAST_VOLUME info;
 180
 181     info.dbcv_size       = sizeof(info);
 182     info.dbcv_devicetype = DBT_DEVTYP_VOLUME;
 183     info.dbcv_reserved   = 0;
 184     info.dbcv_unitmask   = 1 << drive;
 185     info.dbcv_flags      = DBTF_MEDIA;
 186     result = BroadcastSystemMessageW( BSF_FORCEIFHUNG|BSF_QUERY, NULL,
 187                                       WM_DEVICECHANGE, code, (LPARAM)&info );
 188 }
 189
 190 /* create the disk device for a given volume */
 191 static NTSTATUS create_disk_device( enum device_type type, struct disk_device **device_ret )
 192 {
 193     static const WCHAR harddiskvolW[] = {'\\','D','e','v','i','c','e',
 194                                          '\\','H','a','r','d','d','i','s','k','V','o','l','u','m','e','%','u',0};
 195     static const WCHAR harddiskW[] = {'\\','D','e','v','i','c','e','\\','H','a','r','d','d','i','s','k','%','u',0};
 196     static const WCHAR cdromW[] = {'\\','D','e','v','i','c','e','\\','C','d','R','o','m','%','u',0};
 197     static const WCHAR floppyW[] = {'\\','D','e','v','i','c','e','\\','F','l','o','p','p','y','%','u',0};
 198     static const WCHAR ramdiskW[] = {'\\','D','e','v','i','c','e','\\','R','a','m','d','i','s','k','%','u',0};
 199     static const WCHAR physdriveW[] = {'\\','?','?','\\','P','h','y','s','i','c','a','l','D','r','i','v','e','%','u',0};
 200
 201     UINT i, first = 0;
 202     NTSTATUS status = 0;
 203     const WCHAR *format = NULL;
 204     UNICODE_STRING name;
 205     DEVICE_OBJECT *dev_obj;
 206     struct disk_device *device;
 207
 208     switch(type)
 209     {
 210     case DEVICE_UNKNOWN:
 211     case DEVICE_HARDDISK:
 212     case DEVICE_NETWORK:  /* FIXME */
 213         format = harddiskW;
 214         break;
 215     case DEVICE_HARDDISK_VOL:
 216         format = harddiskvolW;
 217         first = 1;  /* harddisk volumes start counting from 1 */
 218         break;
 219     case DEVICE_FLOPPY:
 220         format = floppyW;
 221         break;
 222     case DEVICE_CDROM:
 223         format = cdromW;
 224         break;
 225     case DEVICE_RAMDISK:
 226         format = ramdiskW;
 227         break;
 228     }
 229
 230     name.MaximumLength = (strlenW(format) + 10) * sizeof(WCHAR);
 231     name.Buffer = RtlAllocateHeap( GetProcessHeap(), 0, name.MaximumLength );
 232     for (i = first; i < 32; i++)
 233     {
 234         sprintfW( name.Buffer, format, i );
 235         name.Length = strlenW(name.Buffer) * sizeof(WCHAR);
 236         status = IoCreateDevice( harddisk_driver, sizeof(*device), &name, 0, 0, FALSE, &dev_obj );
 237         if (status != STATUS_OBJECT_NAME_COLLISION) break;
 238     }
 239     if (!status)
 240     {
 241         device = dev_obj->DeviceExtension;
 242         device->dev_obj        = dev_obj;
 243         device->name           = name;
 244         device->type           = type;
 245         device->unix_device    = NULL;
 246         device->unix_mount     = NULL;
 247         device->symlink.Buffer = NULL;
 248
 249         switch (type)
 250         {
 251         case DEVICE_FLOPPY:
 252         case DEVICE_RAMDISK:
 253             device->devnum.DeviceType = FILE_DEVICE_DISK;
 254             device->devnum.DeviceNumber = i;
 255             device->devnum.PartitionNumber = ~0u;
 256             break;
 257         case DEVICE_CDROM:
 258             device->devnum.DeviceType = FILE_DEVICE_CD_ROM;
 259             device->devnum.DeviceNumber = i;
 260             device->devnum.PartitionNumber = ~0u;
 261             break;
 262         case DEVICE_UNKNOWN:
 263         case DEVICE_HARDDISK:
 264         case DEVICE_NETWORK:  /* FIXME */
 265             {
 266                 UNICODE_STRING symlink;
 267
 268                 symlink.MaximumLength = sizeof(physdriveW) + 10 * sizeof(WCHAR);
 269                 if ((symlink.Buffer = RtlAllocateHeap( GetProcessHeap(), 0, symlink.MaximumLength)))
 270                 {
 271                     sprintfW( symlink.Buffer, physdriveW, i );
 272                     symlink.Length = strlenW(symlink.Buffer) * sizeof(WCHAR);
 273                     if (!IoCreateSymbolicLink( &symlink, &name )) device->symlink = symlink;
 274                 }
 275                 device->devnum.DeviceType = FILE_DEVICE_DISK;
 276                 device->devnum.DeviceNumber = i;
 277                 device->devnum.PartitionNumber = 0;
 278             }
 279             break;
 280         case DEVICE_HARDDISK_VOL:
 281             device->devnum.DeviceType = FILE_DEVICE_DISK;
 282             device->devnum.DeviceNumber = 0;
 283             device->devnum.PartitionNumber = i;
 284             break;
 285         }
 286         *device_ret = device;
 287         TRACE( "created device %s\n", debugstr_w(name.Buffer) );
 288     }
 289     else
 290     {
 291         FIXME( "IoCreateDevice %s got %x\n", debugstr_w(name.Buffer), status );
 292         RtlFreeUnicodeString( &name );
 293     }
 294     return status;
 295 }
 296
 297 /* delete the disk device for a given drive */
 298 static void delete_disk_device( struct disk_device *device )
 299 {
 300     TRACE( "deleting device %s\n", debugstr_w(device->name.Buffer) );
 301     if (device->symlink.Buffer)
 302     {
 303         IoDeleteSymbolicLink( &device->symlink );
 304         RtlFreeUnicodeString( &device->symlink );
 305     }
 306     RtlFreeHeap( GetProcessHeap(), 0, device->unix_device );
 307     RtlFreeHeap( GetProcessHeap(), 0, device->unix_mount );
 308     RtlFreeUnicodeString( &device->name );
 309     IoDeleteDevice( device->dev_obj );
 310 }
 311
 312 /* grab another reference to a volume */
 313 static unsigned int grab_volume( struct volume *volume )
 314 {
 315     return ++volume->ref;
 316 }
 317
 318 /* release a volume and delete the corresponding disk device when refcount is 0 */
 319 static unsigned int release_volume( struct volume *volume )
 320 {
 321     unsigned int ret = --volume->ref;
 322
 323     TRACE( "%s udi %s count now %u\n", debugstr_guid(&volume->guid), debugstr_a(volume->udi), ret );
 324     if (!ret)
 325     {
 326         assert( !volume->udi );
 327         list_remove( &volume->entry );
 328         if (volume->mount) delete_mount_point( volume->mount );
 329         delete_disk_device( volume->device );
 330         RtlFreeHeap( GetProcessHeap(), 0, volume );
 331     }
 332     return ret;
 333 }
 334
 335 /* set the volume udi */
 336 static void set_volume_udi( struct volume *volume, const char *udi )
 337 {
 338     if (udi)
 339     {
 340         assert( !volume->udi );
 341         /* having a udi means the HAL side holds an extra reference */
 342         if ((volume->udi = strdupA( udi ))) grab_volume( volume );
 343     }
 344     else if (volume->udi)
 345     {
 346         RtlFreeHeap( GetProcessHeap(), 0, volume->udi );
 347         volume->udi = NULL;
 348         release_volume( volume );
 349     }
 350 }
 351
 352 /* create a disk volume */
 353 static NTSTATUS create_volume( const char *udi, enum device_type type, struct volume **volume_ret )
 354 {
 355     struct volume *volume;
 356     NTSTATUS status;
 357
 358     if (!(volume = RtlAllocateHeap( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*volume) )))
 359         return STATUS_NO_MEMORY;
 360
 361     if (!(status = create_disk_device( type, &volume->device )))
 362     {
 363         if (udi) set_volume_udi( volume, udi );
 364         list_add_tail( &volumes_list, &volume->entry );
 365         *volume_ret = volume;
 366     }
 367     else RtlFreeHeap( GetProcessHeap(), 0, volume );
 368
 369     return status;
 370 }
 371
 372 /* create the disk device for a given volume */
 373 static NTSTATUS create_dos_device( struct volume *volume, const char *udi, int letter,
 374                                    enum device_type type, struct dos_drive **drive_ret )
 375 {
 376     struct dos_drive *drive;
 377     NTSTATUS status;
 378
 379     if (!(drive = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(*drive) ))) return STATUS_NO_MEMORY;
 380     drive->drive = letter;
 381     drive->mount = NULL;
 382
 383     if (volume)
 384     {
 385         if (udi) set_volume_udi( volume, udi );
 386         drive->volume = volume;
 387         status = STATUS_SUCCESS;
 388     }
 389     else status = create_volume( udi, type, &drive->volume );
 390
 391     if (status == STATUS_SUCCESS)
 392     {
 393         grab_volume( drive->volume );
 394         list_add_tail( &drives_list, &drive->entry );
 395         *drive_ret = drive;
 396     }
 397     else RtlFreeHeap( GetProcessHeap(), 0, drive );
 398
 399     return status;
 400 }
 401
 402 /* delete the disk device for a given drive */
 403 static void delete_dos_device( struct dos_drive *drive )
 404 {
 405     list_remove( &drive->entry );
 406     if (drive->mount) delete_mount_point( drive->mount );
 407     release_volume( drive->volume );
 408     RtlFreeHeap( GetProcessHeap(), 0, drive );
 409 }
 410
 411 /* find a volume that matches the parameters */
 412 static struct volume *find_matching_volume( const char *udi, const char *device,
 413                                             const char *mount_point, enum device_type type )
 414 {
 415     struct volume *volume;
 416     struct disk_device *disk_device;
 417
 418     LIST_FOR_EACH_ENTRY( volume, &volumes_list, struct volume, entry )
 419     {
 420         /* when we have a udi we only match drives added manually */
 421         if (udi && volume->udi) continue;
 422         /* and when we don't have a udi we only match dynamic drives */
 423         if (!udi && !volume->udi) continue;
 424
 425         disk_device = volume->device;
 426         if (disk_device->type != type) continue;
 427         if (device && disk_device->unix_device && strcmp( device, disk_device->unix_device )) continue;
 428         if (mount_point && disk_device->unix_mount && strcmp( mount_point, disk_device->unix_mount )) continue;
 429         TRACE( "found matching volume %s for device %s mount %s type %u\n",
 430                debugstr_guid(&volume->guid), debugstr_a(device), debugstr_a(mount_point), type );
 431         return volume;
 432     }
 433     return NULL;
 434 }
 435
 436 /* change the information for an existing volume */
 437 static NTSTATUS set_volume_info( struct volume *volume, struct dos_drive *drive, const char *device,
 438                                  const char *mount_point, enum device_type type, const GUID *guid )
 439 {
 440     void *id = NULL;
 441     unsigned int id_len = 0;
 442     struct disk_device *disk_device = volume->device;
 443     NTSTATUS status;
 444
 445     if (type != disk_device->type)
 446     {
 447         if ((status = create_disk_device( type, &disk_device ))) return status;
 448         if (volume->mount)
 449         {
 450             delete_mount_point( volume->mount );
 451             volume->mount = NULL;
 452         }
 453         if (drive && drive->mount)
 454         {
 455             delete_mount_point( drive->mount );
 456             drive->mount = NULL;
 457         }
 458         delete_disk_device( volume->device );
 459         volume->device = disk_device;
 460     }
 461     else
 462     {
 463         RtlFreeHeap( GetProcessHeap(), 0, disk_device->unix_device );
 464         RtlFreeHeap( GetProcessHeap(), 0, disk_device->unix_mount );
 465     }
 466     disk_device->unix_device = strdupA( device );
 467     disk_device->unix_mount = strdupA( mount_point );
 468
 469     if (guid && memcmp( &volume->guid, guid, sizeof(volume->guid) ))
 470     {
 471         volume->guid = *guid;
 472         if (volume->mount)
 473         {
 474             delete_mount_point( volume->mount );
 475             volume->mount = NULL;
 476         }
 477     }
 478
 479     if (!volume->mount)
 480         volume->mount = add_volume_mount_point( disk_device->dev_obj, &disk_device->name, &volume->guid );
 481     if (drive && !drive->mount)
 482         drive->mount = add_dosdev_mount_point( disk_device->dev_obj, &disk_device->name, drive->drive );
 483
 484     if (disk_device->unix_mount)
 485     {
 486         id = disk_device->unix_mount;
 487         id_len = strlen( disk_device->unix_mount ) + 1;
 488     }
 489     if (volume->mount) set_mount_point_id( volume->mount, id, id_len );
 490     if (drive && drive->mount) set_mount_point_id( drive->mount, id, id_len );
 491
 492     return STATUS_SUCCESS;
 493 }
 494
 495 /* change the drive letter or volume for an existing drive */
 496 static void set_drive_info( struct dos_drive *drive, int letter, struct volume *volume )
 497 {
 498     if (drive->drive != letter)
 499     {
 500         if (drive->mount) delete_mount_point( drive->mount );
 501         drive->mount = NULL;
 502         drive->drive = letter;
 503     }
 504     if (drive->volume != volume)
 505     {
 506         if (drive->mount) delete_mount_point( drive->mount );
 507         drive->mount = NULL;
 508         grab_volume( volume );
 509         release_volume( drive->volume );
 510         drive->volume = volume;
 511     }
 512 }
 513
 514 static inline int is_valid_device( struct stat *st )
 515 {
 516 #if defined(linux) || defined(__sun__)
 517     return S_ISBLK( st->st_mode );
 518 #else
 519     /* disks are char devices on *BSD */
 520     return S_ISCHR( st->st_mode );
 521 #endif
 522 }
 523
 524 /* find or create a DOS drive for the corresponding device */
 525 static int add_drive( const char *device, enum device_type type )
 526 {
 527     char *path, *p;
 528     char in_use[26];
 529     struct stat dev_st, drive_st;
 530     int drive, first, last, avail = 0;
 531
 532     if (stat( device, &dev_st ) == -1 || !is_valid_device( &dev_st )) return -1;
 533
 534     if (!(path = get_dosdevices_path( &p ))) return -1;
 535
 536     memset( in_use, 0, sizeof(in_use) );
 537
 538     switch (type)
 539     {
 540     case DEVICE_FLOPPY:
 541         first = 0;
 542         last = 2;
 543         break;
 544     case DEVICE_CDROM:
 545         first = 3;
 546         last = 26;
 547         break;
 548     default:
 549         first = 2;
 550         last = 26;
 551         break;
 552     }
 553
 554     while (avail != -1)
 555     {
 556         avail = -1;
 557         for (drive = first; drive < last; drive++)
 558         {
 559             if (in_use[drive]) continue;  /* already checked */
 560             *p = 'a' + drive;
 561             if (stat( path, &drive_st ) == -1)
 562             {
 563                 if (lstat( path, &drive_st ) == -1 && errno == ENOENT)  /* this is a candidate */
 564                 {
 565                     if (avail == -1)
 566                     {
 567                         p[2] = 0;
 568                         /* if mount point symlink doesn't exist either, it's available */
 569                         if (lstat( path, &drive_st ) == -1 && errno == ENOENT) avail = drive;
 570                         p[2] = ':';
 571                     }
 572                 }
 573                 else in_use[drive] = 1;
 574             }
 575             else
 576             {
 577                 in_use[drive] = 1;
 578                 if (!is_valid_device( &drive_st )) continue;
 579                 if (dev_st.st_rdev == drive_st.st_rdev) goto done;
 580             }
 581         }
 582         if (avail != -1)
 583         {
 584             /* try to use the one we found */
 585             drive = avail;
 586             *p = 'a' + drive;
 587             if (symlink( device, path ) != -1) goto done;
 588             /* failed, retry the search */
 589         }
 590     }
 591     drive = -1;
 592
 593 done:
 594     HeapFree( GetProcessHeap(), 0, path );
 595     return drive;
 596 }
 597
 598 /* create devices for mapped drives */
 599 static void create_drive_devices(void)
 600 {
 601     char *path, *p, *link, *device;
 602     struct dos_drive *drive;
 603     struct volume *volume;
 604     unsigned int i;
 605     HKEY drives_key;
 606     enum device_type drive_type;
 607     WCHAR driveW[] = {'a',':',0};
 608
 609     if (!(path = get_dosdevices_path( &p ))) return;
 610     if (RegOpenKeyW( HKEY_LOCAL_MACHINE, drives_keyW, &drives_key )) drives_key = 0;
 611
 612     for (i = 0; i < MAX_DOS_DRIVES; i++)
 613     {
 614         p[0] = 'a' + i;
 615         p[2] = 0;
 616         if (!(link = read_symlink( path ))) continue;
 617         p[2] = ':';
 618         device = read_symlink( path );
 619
 620         drive_type = i < 2 ? DEVICE_FLOPPY : DEVICE_HARDDISK_VOL;
 621         if (drives_key)
 622         {
 623             WCHAR buffer[32];
 624             DWORD j, type, size = sizeof(buffer);
 625
 626             driveW[0] = 'a' + i;
 627             if (!RegQueryValueExW( drives_key, driveW, NULL, &type, (BYTE *)buffer, &size ) &&
 628                 type == REG_SZ)
 629             {
 630                 for (j = 0; j < sizeof(drive_types)/sizeof(drive_types[0]); j++)
 631                     if (drive_types[j][0] && !strcmpiW( buffer, drive_types[j] ))
 632                     {
 633                         drive_type = j;
 634                         break;
 635                     }
 636                 if (drive_type == DEVICE_FLOPPY && i >= 2) drive_type = DEVICE_HARDDISK;
 637             }
 638         }
 639
 640         volume = find_matching_volume( NULL, device, link, drive_type );
 641         if (!create_dos_device( volume, NULL, i, drive_type, &drive ))
 642         {
 643             /* don't reset uuid if we used an existing volume */
 644             const GUID *guid = volume ? NULL : get_default_uuid(i);
 645             set_volume_info( drive->volume, drive, device, link, drive_type, guid );
 646         }
 647         else
 648         {
 649             RtlFreeHeap( GetProcessHeap(), 0, link );
 650             RtlFreeHeap( GetProcessHeap(), 0, device );
 651         }
 652     }
 653     RegCloseKey( drives_key );
 654     RtlFreeHeap( GetProcessHeap(), 0, path );
 655 }
 656
 657 /* create a new disk volume */
 658 NTSTATUS add_volume( const char *udi, const char *device, const char *mount_point,
 659                      enum device_type type, const GUID *guid )
 660 {
 661     struct volume *volume;
 662     NTSTATUS status = STATUS_SUCCESS;
 663
 664     TRACE( "adding %s device %s mount %s type %u uuid %s\n", debugstr_a(udi),
 665            debugstr_a(device), debugstr_a(mount_point), type, debugstr_guid(guid) );
 666
 667     EnterCriticalSection( &device_section );
 668     LIST_FOR_EACH_ENTRY( volume, &volumes_list, struct volume, entry )
 669         if (volume->udi && !strcmp( udi, volume->udi )) goto found;
 670
 671     /* udi not found, search for a non-dynamic volume */
 672     if ((volume = find_matching_volume( udi, device, mount_point, type ))) set_volume_udi( volume, udi );
 673     else status = create_volume( udi, type, &volume );
 674
 675 found:
 676     if (!status) status = set_volume_info( volume, NULL, device, mount_point, type, guid );
 677     LeaveCriticalSection( &device_section );
 678     return status;
 679 }
 680
 681 /* create a new disk volume */
 682 NTSTATUS remove_volume( const char *udi )
 683 {
 684     NTSTATUS status = STATUS_NO_SUCH_DEVICE;
 685     struct volume *volume;
 686
 687     EnterCriticalSection( &device_section );
 688     LIST_FOR_EACH_ENTRY( volume, &volumes_list, struct volume, entry )
 689     {
 690         if (!volume->udi || strcmp( udi, volume->udi )) continue;
 691         set_volume_udi( volume, NULL );
 692         status = STATUS_SUCCESS;
 693         break;
 694     }
 695     LeaveCriticalSection( &device_section );
 696     return status;
 697 }
 698
 699
 700 /* create a new dos drive */
 701 NTSTATUS add_dos_device( int letter, const char *udi, const char *device,
 702                          const char *mount_point, enum device_type type, const GUID *guid )
 703 {
 704     char *path, *p;
 705     HKEY hkey;
 706     NTSTATUS status = STATUS_SUCCESS;
 707     struct dos_drive *drive, *next;
 708     struct volume *volume;
 709     int notify = -1;
 710
 711     if (!(path = get_dosdevices_path( &p ))) return STATUS_NO_MEMORY;
 712
 713     EnterCriticalSection( &device_section );
 714     volume = find_matching_volume( udi, device, mount_point, type );
 715
 716     if (letter == -1)  /* auto-assign a letter */
 717     {
 718         letter = add_drive( device, type );
 719         if (letter == -1)
 720         {
 721             status = STATUS_OBJECT_NAME_COLLISION;
 722             goto done;
 723         }
 724
 725         LIST_FOR_EACH_ENTRY_SAFE( drive, next, &drives_list, struct dos_drive, entry )
 726         {
 727             if (drive->volume->udi && !strcmp( udi, drive->volume->udi )) goto found;
 728             if (drive->drive == letter) delete_dos_device( drive );
 729         }
 730     }
 731     else  /* simply reset the device symlink */
 732     {
 733         LIST_FOR_EACH_ENTRY( drive, &drives_list, struct dos_drive, entry )
 734             if (drive->drive == letter) break;
 735
 736         *p = 'a' + letter;
 737         if (&drive->entry == &drives_list) update_symlink( path, device, NULL );
 738         else
 739         {
 740             update_symlink( path, device, drive->volume->device->unix_device );
 741             delete_dos_device( drive );
 742         }
 743     }
 744
 745     if ((status = create_dos_device( volume, udi, letter, type, &drive ))) goto done;
 746
 747 found:
 748     if (!guid && !volume) guid = get_default_uuid( letter );
 749     if (!volume) volume = drive->volume;
 750     set_drive_info( drive, letter, volume );
 751     p[0] = 'a' + drive->drive;
 752     p[2] = 0;
 753     update_symlink( path, mount_point, volume->device->unix_mount );
 754     set_volume_info( volume, drive, device, mount_point, type, guid );
 755
 756     TRACE( "added device %c: udi %s for %s on %s type %u\n",
 757            'a' + drive->drive, wine_dbgstr_a(udi), wine_dbgstr_a(device),
 758            wine_dbgstr_a(mount_point), type );
 759
 760     /* hack: force the drive type in the registry */
 761     if (!RegCreateKeyW( HKEY_LOCAL_MACHINE, drives_keyW, &hkey ))
 762     {
 763         const WCHAR *type_name = drive_types[type];
 764         WCHAR name[3] = {'a',':',0};
 765
 766         name[0] += drive->drive;
 767         if (!type_name[0] && type == DEVICE_HARDDISK) type_name = drive_types[DEVICE_FLOPPY];
 768         if (type_name[0])
 769             RegSetValueExW( hkey, name, 0, REG_SZ, (const BYTE *)type_name,
 770                             (strlenW(type_name) + 1) * sizeof(WCHAR) );
 771         else
 772             RegDeleteValueW( hkey, name );
 773         RegCloseKey( hkey );
 774     }
 775
 776     if (udi) notify = drive->drive;
 777
 778 done:
 779     LeaveCriticalSection( &device_section );
 780     RtlFreeHeap( GetProcessHeap(), 0, path );
 781     if (notify != -1) send_notify( notify, DBT_DEVICEARRIVAL );
 782     return status;
 783 }
 784
 785 /* remove an existing dos drive, by letter or udi */
 786 NTSTATUS remove_dos_device( int letter, const char *udi )
 787 {
 788     NTSTATUS status = STATUS_NO_SUCH_DEVICE;
 789     HKEY hkey;
 790     struct dos_drive *drive;
 791     char *path, *p;
 792     int notify = -1;
 793
 794     EnterCriticalSection( &device_section );
 795     LIST_FOR_EACH_ENTRY( drive, &drives_list, struct dos_drive, entry )
 796     {
 797         if (udi)
 798         {
 799             if (!drive->volume->udi) continue;
 800             if (strcmp( udi, drive->volume->udi )) continue;
 801             set_volume_udi( drive->volume, NULL );
 802         }
 803         else if (drive->drive != letter) continue;
 804
 805         if ((path = get_dosdevices_path( &p )))
 806         {
 807             p[0] = 'a' + drive->drive;
 808             p[2] = 0;
 809             unlink( path );
 810             RtlFreeHeap( GetProcessHeap(), 0, path );
 811         }
 812
 813         /* clear the registry key too */
 814         if (!RegOpenKeyW( HKEY_LOCAL_MACHINE, drives_keyW, &hkey ))
 815         {
 816             WCHAR name[3] = {'a',':',0};
 817             name[0] += drive->drive;
 818             RegDeleteValueW( hkey, name );
 819             RegCloseKey( hkey );
 820         }
 821
 822         if (udi && drive->volume->device->unix_mount) notify = drive->drive;
 823
 824         delete_dos_device( drive );
 825         status = STATUS_SUCCESS;
 826         break;
 827     }
 828     LeaveCriticalSection( &device_section );
 829     if (notify != -1) send_notify( notify, DBT_DEVICEREMOVECOMPLETE );
 830     return status;
 831 }
 832
 833 /* query information about an existing dos drive, by letter or udi */
 834 NTSTATUS query_dos_device( int letter, enum device_type *type, char **device, char **mount_point )
 835 {
 836     NTSTATUS status = STATUS_NO_SUCH_DEVICE;
 837     struct dos_drive *drive;
 838     struct disk_device *disk_device;
 839
 840     EnterCriticalSection( &device_section );
 841     LIST_FOR_EACH_ENTRY( drive, &drives_list, struct dos_drive, entry )
 842     {
 843         if (drive->drive != letter) continue;
 844         disk_device = drive->volume->device;
 845         if (type) *type = disk_device->type;
 846         if (device) *device = strdupA( disk_device->unix_device );
 847         if (mount_point) *mount_point = strdupA( disk_device->unix_mount );
 848         status = STATUS_SUCCESS;
 849         break;
 850     }
 851     LeaveCriticalSection( &device_section );
 852     return status;
 853 }
 854
 855 /* handler for ioctls on the harddisk device */
 856 static NTSTATUS WINAPI harddisk_ioctl( DEVICE_OBJECT *device, IRP *irp )
 857 {
 858     IO_STACK_LOCATION *irpsp = irp->Tail.Overlay.s.u.CurrentStackLocation;
 859     struct disk_device *dev = device->DeviceExtension;
 860
 861     TRACE( "ioctl %x insize %u outsize %u\n",
 862            irpsp->Parameters.DeviceIoControl.IoControlCode,
 863            irpsp->Parameters.DeviceIoControl.InputBufferLength,
 864            irpsp->Parameters.DeviceIoControl.OutputBufferLength );
 865
 866     EnterCriticalSection( &device_section );
 867
 868     switch(irpsp->Parameters.DeviceIoControl.IoControlCode)
 869     {
 870     case IOCTL_DISK_GET_DRIVE_GEOMETRY:
 871     {
 872         DISK_GEOMETRY info;
 873         DWORD len = min( sizeof(info), irpsp->Parameters.DeviceIoControl.OutputBufferLength );
 874
 875         info.Cylinders.QuadPart = 10000;
 876         info.MediaType = (dev->devnum.DeviceType == FILE_DEVICE_DISK) ? FixedMedia : RemovableMedia;
 877         info.TracksPerCylinder = 255;
 878         info.SectorsPerTrack = 63;
 879         info.BytesPerSector = 512;
 880         memcpy( irp->MdlAddress->StartVa, &info, len );
 881         irp->IoStatus.Information = len;
 882         irp->IoStatus.u.Status = STATUS_SUCCESS;
 883         break;
 884     }
 885     case IOCTL_STORAGE_GET_DEVICE_NUMBER:
 886     {
 887         DWORD len = min( sizeof(dev->devnum), irpsp->Parameters.DeviceIoControl.OutputBufferLength );
 888
 889         memcpy( irp->MdlAddress->StartVa, &dev->devnum, len );
 890         irp->IoStatus.Information = len;
 891         irp->IoStatus.u.Status = STATUS_SUCCESS;
 892         break;
 893     }
 894     case IOCTL_CDROM_READ_TOC:
 895         irp->IoStatus.u.Status = STATUS_INVALID_DEVICE_REQUEST;
 896         break;
 897     default:
 898         FIXME( "unsupported ioctl %x\n", irpsp->Parameters.DeviceIoControl.IoControlCode );
 899         irp->IoStatus.u.Status = STATUS_NOT_SUPPORTED;
 900         break;
 901     }
 902
 903     LeaveCriticalSection( &device_section );
 904     return irp->IoStatus.u.Status;
 905 }
 906
 907 /* driver entry point for the harddisk driver */
 908 NTSTATUS WINAPI harddisk_driver_entry( DRIVER_OBJECT *driver, UNICODE_STRING *path )
 909 {
 910     struct disk_device *device;
 911
 912     harddisk_driver = driver;
 913     driver->MajorFunction[IRP_MJ_DEVICE_CONTROL] = harddisk_ioctl;
 914
 915     /* create a harddisk0 device that isn't assigned to any drive */
 916     create_disk_device( DEVICE_HARDDISK, &device );
 917
 918     create_drive_devices();
 919
 920     return STATUS_SUCCESS;
 921 }