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     {'c','d','r','o','m',0},         /* DEVICE_DVD */
  52     {'n','e','t','w','o','r','k',0}, /* DEVICE_NETWORK */
  53     {'r','a','m','d','i','s','k',0}  /* DEVICE_RAMDISK */
  54 };
  55
  56 static const WCHAR drives_keyW[] = {'S','o','f','t','w','a','r','e','\\',
  57                                     'W','i','n','e','\\','D','r','i','v','e','s',0};
  58
  59 struct disk_device
  60 {
  61     enum device_type      type;        /* drive type */
  62     DEVICE_OBJECT        *dev_obj;     /* disk device allocated for this volume */
  63     UNICODE_STRING        name;        /* device name */
  64     UNICODE_STRING        symlink;     /* device symlink if any */
  65     STORAGE_DEVICE_NUMBER devnum;      /* device number info */
  66     char                 *unix_device; /* unix device path */
  67     char                 *unix_mount;  /* unix mount point path */
  68 };
  69
  70 struct volume
  71 {
  72     struct list           entry;       /* entry in volumes list */
  73     struct disk_device   *device;      /* disk device */
  74     char                 *udi;         /* unique identifier for dynamic volumes */
  75     unsigned int          ref;         /* ref count */
  76     GUID                  guid;        /* volume uuid */
  77     struct mount_point   *mount;       /* Volume{xxx} mount point */
  78 };
  79
  80 struct dos_drive
  81 {
  82     struct list           entry;       /* entry in drives list */
  83     struct volume        *volume;      /* volume for this drive */
  84     int                   drive;       /* drive letter (0 = A: etc.) */
  85     struct mount_point   *mount;       /* DosDevices mount point */
  86 };
  87
  88 static struct list drives_list = LIST_INIT(drives_list);
  89 static struct list volumes_list = LIST_INIT(volumes_list);
  90
  91 static DRIVER_OBJECT *harddisk_driver;
  92
  93 static CRITICAL_SECTION device_section;
  94 static CRITICAL_SECTION_DEBUG critsect_debug =
  95 {
  96     0, 0, &device_section,
  97     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  98       0, 0, { (DWORD_PTR)(__FILE__ ": device_section") }
  99 };
 100 static CRITICAL_SECTION device_section = { &critsect_debug, -1, 0, 0, 0, 0 };
 101
 102 static char *get_dosdevices_path( char **drive )
 103 {
 104     const char *config_dir = wine_get_config_dir();
 105     size_t len = strlen(config_dir) + sizeof("/dosdevices/a::");
 106     char *path = HeapAlloc( GetProcessHeap(), 0, len );
 107     if (path)
 108     {
 109         strcpy( path, config_dir );
 110         strcat( path, "/dosdevices/a::" );
 111         *drive = path + len - 4;
 112     }
 113     return path;
 114 }
 115
 116 static char *strdupA( const char *str )
 117 {
 118     char *ret;
 119
 120     if (!str) return NULL;
 121     if ((ret = RtlAllocateHeap( GetProcessHeap(), 0, strlen(str) + 1 ))) strcpy( ret, str );
 122     return ret;
 123 }
 124
 125 static const GUID *get_default_uuid( int letter )
 126 {
 127     static GUID guid;
 128
 129     guid.Data4[7] = 'A' + letter;
 130     return &guid;
 131 }
 132
 133 /* read a Unix symlink; returned buffer must be freed by caller */
 134 static char *read_symlink( const char *path )
 135 {
 136     char *buffer;
 137     int ret, size = 128;
 138
 139     for (;;)
 140     {
 141         if (!(buffer = RtlAllocateHeap( GetProcessHeap(), 0, size )))
 142         {
 143             SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 144             return 0;
 145         }
 146         ret = readlink( path, buffer, size );
 147         if (ret == -1)
 148         {
 149             RtlFreeHeap( GetProcessHeap(), 0, buffer );
 150             return 0;
 151         }
 152         if (ret != size)
 153         {
 154             buffer[ret] = 0;
 155             return buffer;
 156         }
 157         RtlFreeHeap( GetProcessHeap(), 0, buffer );
 158         size *= 2;
 159     }
 160 }
 161
 162 /* update a symlink if it changed; return TRUE if updated */
 163 static void update_symlink( const char *path, const char *dest, const char *orig_dest )
 164 {
 165     if (dest && dest[0])
 166     {
 167         if (!orig_dest || strcmp( orig_dest, dest ))
 168         {
 169             unlink( path );
 170             symlink( dest, path );
 171         }
 172     }
 173     else unlink( path );
 174 }
 175
 176 /* send notification about a change to a given drive */
 177 static void send_notify( int drive, int code )
 178 {
 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     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 cdromlinkW[] = {'\\','?','?','\\','C','d','R','o','m','%','u',0};
 200     static const WCHAR physdriveW[] = {'\\','?','?','\\','P','h','y','s','i','c','a','l','D','r','i','v','e','%','u',0};
 201
 202     UINT i, first = 0;
 203     NTSTATUS status = 0;
 204     const WCHAR *format = NULL;
 205     const WCHAR *link_format = NULL;
 206     UNICODE_STRING name;
 207     DEVICE_OBJECT *dev_obj;
 208     struct disk_device *device;
 209
 210     switch(type)
 211     {
 212     case DEVICE_UNKNOWN:
 213     case DEVICE_HARDDISK:
 214     case DEVICE_NETWORK:  /* FIXME */
 215         format = harddiskW;
 216         link_format = physdriveW;
 217         break;
 218     case DEVICE_HARDDISK_VOL:
 219         format = harddiskvolW;
 220         first = 1;  /* harddisk volumes start counting from 1 */
 221         break;
 222     case DEVICE_FLOPPY:
 223         format = floppyW;
 224         break;
 225     case DEVICE_CDROM:
 226     case DEVICE_DVD:
 227         format = cdromW;
 228         link_format = cdromlinkW;
 229         break;
 230     case DEVICE_RAMDISK:
 231         format = ramdiskW;
 232         break;
 233     }
 234
 235     name.MaximumLength = (strlenW(format) + 10) * sizeof(WCHAR);
 236     name.Buffer = RtlAllocateHeap( GetProcessHeap(), 0, name.MaximumLength );
 237     for (i = first; i < 32; i++)
 238     {
 239         sprintfW( name.Buffer, format, i );
 240         name.Length = strlenW(name.Buffer) * sizeof(WCHAR);
 241         status = IoCreateDevice( harddisk_driver, sizeof(*device), &name, 0, 0, FALSE, &dev_obj );
 242         if (status != STATUS_OBJECT_NAME_COLLISION) break;
 243     }
 244     if (!status)
 245     {
 246         device = dev_obj->DeviceExtension;
 247         device->dev_obj        = dev_obj;
 248         device->name           = name;
 249         device->type           = type;
 250         device->unix_device    = NULL;
 251         device->unix_mount     = NULL;
 252         device->symlink.Buffer = NULL;
 253
 254         if (link_format)
 255         {
 256             UNICODE_STRING symlink;
 257
 258             symlink.MaximumLength = (strlenW(link_format) + 10) * sizeof(WCHAR);
 259             if ((symlink.Buffer = RtlAllocateHeap( GetProcessHeap(), 0, symlink.MaximumLength)))
 260             {
 261                 sprintfW( symlink.Buffer, link_format, i );
 262                 symlink.Length = strlenW(symlink.Buffer) * sizeof(WCHAR);
 263                 if (!IoCreateSymbolicLink( &symlink, &name )) device->symlink = symlink;
 264             }
 265         }
 266
 267         switch (type)
 268         {
 269         case DEVICE_FLOPPY:
 270         case DEVICE_RAMDISK:
 271             device->devnum.DeviceType = FILE_DEVICE_DISK;
 272             device->devnum.DeviceNumber = i;
 273             device->devnum.PartitionNumber = ~0u;
 274             break;
 275         case DEVICE_CDROM:
 276             device->devnum.DeviceType = FILE_DEVICE_CD_ROM;
 277             device->devnum.DeviceNumber = i;
 278             device->devnum.PartitionNumber = ~0u;
 279             break;
 280         case DEVICE_DVD:
 281             device->devnum.DeviceType = FILE_DEVICE_DVD;
 282             device->devnum.DeviceNumber = i;
 283             device->devnum.PartitionNumber = ~0u;
 284             break;
 285         case DEVICE_UNKNOWN:
 286         case DEVICE_HARDDISK:
 287         case DEVICE_NETWORK:  /* FIXME */
 288             device->devnum.DeviceType = FILE_DEVICE_DISK;
 289             device->devnum.DeviceNumber = i;
 290             device->devnum.PartitionNumber = 0;
 291             break;
 292         case DEVICE_HARDDISK_VOL:
 293             device->devnum.DeviceType = FILE_DEVICE_DISK;
 294             device->devnum.DeviceNumber = 0;
 295             device->devnum.PartitionNumber = i;
 296             break;
 297         }
 298         *device_ret = device;
 299         TRACE( "created device %s\n", debugstr_w(name.Buffer) );
 300     }
 301     else
 302     {
 303         FIXME( "IoCreateDevice %s got %x\n", debugstr_w(name.Buffer), status );
 304         RtlFreeUnicodeString( &name );
 305     }
 306     return status;
 307 }
 308
 309 /* delete the disk device for a given drive */
 310 static void delete_disk_device( struct disk_device *device )
 311 {
 312     TRACE( "deleting device %s\n", debugstr_w(device->name.Buffer) );
 313     if (device->symlink.Buffer)
 314     {
 315         IoDeleteSymbolicLink( &device->symlink );
 316         RtlFreeUnicodeString( &device->symlink );
 317     }
 318     RtlFreeHeap( GetProcessHeap(), 0, device->unix_device );
 319     RtlFreeHeap( GetProcessHeap(), 0, device->unix_mount );
 320     RtlFreeUnicodeString( &device->name );
 321     IoDeleteDevice( device->dev_obj );
 322 }
 323
 324 /* grab another reference to a volume */
 325 static struct volume *grab_volume( struct volume *volume )
 326 {
 327     volume->ref++;
 328     return volume;
 329 }
 330
 331 /* release a volume and delete the corresponding disk device when refcount is 0 */
 332 static unsigned int release_volume( struct volume *volume )
 333 {
 334     unsigned int ret = --volume->ref;
 335
 336     if (!ret)
 337     {
 338         TRACE( "%s udi %s\n", debugstr_guid(&volume->guid), debugstr_a(volume->udi) );
 339         assert( !volume->udi );
 340         list_remove( &volume->entry );
 341         if (volume->mount) delete_mount_point( volume->mount );
 342         delete_disk_device( volume->device );
 343         RtlFreeHeap( GetProcessHeap(), 0, volume );
 344     }
 345     return ret;
 346 }
 347
 348 /* set the volume udi */
 349 static void set_volume_udi( struct volume *volume, const char *udi )
 350 {
 351     if (udi)
 352     {
 353         assert( !volume->udi );
 354         /* having a udi means the HAL side holds an extra reference */
 355         if ((volume->udi = strdupA( udi ))) grab_volume( volume );
 356     }
 357     else if (volume->udi)
 358     {
 359         RtlFreeHeap( GetProcessHeap(), 0, volume->udi );
 360         volume->udi = NULL;
 361         release_volume( volume );
 362     }
 363 }
 364
 365 /* create a disk volume */
 366 static NTSTATUS create_volume( const char *udi, enum device_type type, struct volume **volume_ret )
 367 {
 368     struct volume *volume;
 369     NTSTATUS status;
 370
 371     if (!(volume = RtlAllocateHeap( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*volume) )))
 372         return STATUS_NO_MEMORY;
 373
 374     if (!(status = create_disk_device( type, &volume->device )))
 375     {
 376         if (udi) set_volume_udi( volume, udi );
 377         list_add_tail( &volumes_list, &volume->entry );
 378         *volume_ret = grab_volume( volume );
 379     }
 380     else RtlFreeHeap( GetProcessHeap(), 0, volume );
 381
 382     return status;
 383 }
 384
 385 /* create the disk device for a given volume */
 386 static NTSTATUS create_dos_device( struct volume *volume, const char *udi, int letter,
 387                                    enum device_type type, struct dos_drive **drive_ret )
 388 {
 389     struct dos_drive *drive;
 390     NTSTATUS status;
 391
 392     if (!(drive = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(*drive) ))) return STATUS_NO_MEMORY;
 393     drive->drive = letter;
 394     drive->mount = NULL;
 395
 396     if (volume)
 397     {
 398         if (udi) set_volume_udi( volume, udi );
 399         drive->volume = grab_volume( volume );
 400         status = STATUS_SUCCESS;
 401     }
 402     else status = create_volume( udi, type, &drive->volume );
 403
 404     if (status == STATUS_SUCCESS)
 405     {
 406         list_add_tail( &drives_list, &drive->entry );
 407         *drive_ret = drive;
 408     }
 409     else RtlFreeHeap( GetProcessHeap(), 0, drive );
 410
 411     return status;
 412 }
 413
 414 /* delete the disk device for a given drive */
 415 static void delete_dos_device( struct dos_drive *drive )
 416 {
 417     list_remove( &drive->entry );
 418     if (drive->mount) delete_mount_point( drive->mount );
 419     release_volume( drive->volume );
 420     RtlFreeHeap( GetProcessHeap(), 0, drive );
 421 }
 422
 423 /* find a volume that matches the parameters */
 424 static struct volume *find_matching_volume( const char *udi, const char *device,
 425                                             const char *mount_point, enum device_type type )
 426 {
 427     struct volume *volume;
 428     struct disk_device *disk_device;
 429
 430     LIST_FOR_EACH_ENTRY( volume, &volumes_list, struct volume, entry )
 431     {
 432         int match = 0;
 433
 434         /* when we have a udi we only match drives added manually */
 435         if (udi && volume->udi) continue;
 436         /* and when we don't have a udi we only match dynamic drives */
 437         if (!udi && !volume->udi) continue;
 438
 439         disk_device = volume->device;
 440         if (disk_device->type != type) continue;
 441         if (device && disk_device->unix_device)
 442         {
 443             if (strcmp( device, disk_device->unix_device )) continue;
 444             match++;
 445         }
 446         if (mount_point && disk_device->unix_mount)
 447         {
 448             if (strcmp( mount_point, disk_device->unix_mount )) continue;
 449             match++;
 450         }
 451         if (!match) continue;
 452         TRACE( "found matching volume %s for device %s mount %s type %u\n",
 453                debugstr_guid(&volume->guid), debugstr_a(device), debugstr_a(mount_point), type );
 454         return grab_volume( volume );
 455     }
 456     return NULL;
 457 }
 458
 459 /* change the information for an existing volume */
 460 static NTSTATUS set_volume_info( struct volume *volume, struct dos_drive *drive, const char *device,
 461                                  const char *mount_point, enum device_type type, const GUID *guid )
 462 {
 463     void *id = NULL;
 464     unsigned int id_len = 0;
 465     struct disk_device *disk_device = volume->device;
 466     NTSTATUS status;
 467
 468     if (type != disk_device->type)
 469     {
 470         if ((status = create_disk_device( type, &disk_device ))) return status;
 471         if (volume->mount)
 472         {
 473             delete_mount_point( volume->mount );
 474             volume->mount = NULL;
 475         }
 476         if (drive && drive->mount)
 477         {
 478             delete_mount_point( drive->mount );
 479             drive->mount = NULL;
 480         }
 481         delete_disk_device( volume->device );
 482         volume->device = disk_device;
 483     }
 484     else
 485     {
 486         RtlFreeHeap( GetProcessHeap(), 0, disk_device->unix_device );
 487         RtlFreeHeap( GetProcessHeap(), 0, disk_device->unix_mount );
 488     }
 489     disk_device->unix_device = strdupA( device );
 490     disk_device->unix_mount = strdupA( mount_point );
 491
 492     if (guid && memcmp( &volume->guid, guid, sizeof(volume->guid) ))
 493     {
 494         volume->guid = *guid;
 495         if (volume->mount)
 496         {
 497             delete_mount_point( volume->mount );
 498             volume->mount = NULL;
 499         }
 500     }
 501
 502     if (!volume->mount)
 503         volume->mount = add_volume_mount_point( disk_device->dev_obj, &disk_device->name, &volume->guid );
 504     if (drive && !drive->mount)
 505         drive->mount = add_dosdev_mount_point( disk_device->dev_obj, &disk_device->name, drive->drive );
 506
 507     if (disk_device->unix_mount)
 508     {
 509         id = disk_device->unix_mount;
 510         id_len = strlen( disk_device->unix_mount ) + 1;
 511     }
 512     if (volume->mount) set_mount_point_id( volume->mount, id, id_len );
 513     if (drive && drive->mount) set_mount_point_id( drive->mount, id, id_len );
 514
 515     return STATUS_SUCCESS;
 516 }
 517
 518 /* change the drive letter or volume for an existing drive */
 519 static void set_drive_info( struct dos_drive *drive, int letter, struct volume *volume )
 520 {
 521     if (drive->drive != letter)
 522     {
 523         if (drive->mount) delete_mount_point( drive->mount );
 524         drive->mount = NULL;
 525         drive->drive = letter;
 526     }
 527     if (drive->volume != volume)
 528     {
 529         if (drive->mount) delete_mount_point( drive->mount );
 530         drive->mount = NULL;
 531         grab_volume( volume );
 532         release_volume( drive->volume );
 533         drive->volume = volume;
 534     }
 535 }
 536
 537 static inline int is_valid_device( struct stat *st )
 538 {
 539 #if defined(linux) || defined(__sun__)
 540     return S_ISBLK( st->st_mode );
 541 #else
 542     /* disks are char devices on *BSD */
 543     return S_ISCHR( st->st_mode );
 544 #endif
 545 }
 546
 547 /* find or create a DOS drive for the corresponding device */
 548 static int add_drive( const char *device, enum device_type type )
 549 {
 550     char *path, *p;
 551     char in_use[26];
 552     struct stat dev_st, drive_st;
 553     int drive, first, last, avail = 0;
 554
 555     if (stat( device, &dev_st ) == -1 || !is_valid_device( &dev_st )) return -1;
 556
 557     if (!(path = get_dosdevices_path( &p ))) return -1;
 558
 559     memset( in_use, 0, sizeof(in_use) );
 560
 561     switch (type)
 562     {
 563     case DEVICE_FLOPPY:
 564         first = 0;
 565         last = 2;
 566         break;
 567     case DEVICE_CDROM:
 568     case DEVICE_DVD:
 569         first = 3;
 570         last = 26;
 571         break;
 572     default:
 573         first = 2;
 574         last = 26;
 575         break;
 576     }
 577
 578     while (avail != -1)
 579     {
 580         avail = -1;
 581         for (drive = first; drive < last; drive++)
 582         {
 583             if (in_use[drive]) continue;  /* already checked */
 584             *p = 'a' + drive;
 585             if (stat( path, &drive_st ) == -1)
 586             {
 587                 if (lstat( path, &drive_st ) == -1 && errno == ENOENT)  /* this is a candidate */
 588                 {
 589                     if (avail == -1)
 590                     {
 591                         p[2] = 0;
 592                         /* if mount point symlink doesn't exist either, it's available */
 593                         if (lstat( path, &drive_st ) == -1 && errno == ENOENT) avail = drive;
 594                         p[2] = ':';
 595                     }
 596                 }
 597                 else in_use[drive] = 1;
 598             }
 599             else
 600             {
 601                 in_use[drive] = 1;
 602                 if (!is_valid_device( &drive_st )) continue;
 603                 if (dev_st.st_rdev == drive_st.st_rdev) goto done;
 604             }
 605         }
 606         if (avail != -1)
 607         {
 608             /* try to use the one we found */
 609             drive = avail;
 610             *p = 'a' + drive;
 611             if (symlink( device, path ) != -1) goto done;
 612             /* failed, retry the search */
 613         }
 614     }
 615     drive = -1;
 616
 617 done:
 618     HeapFree( GetProcessHeap(), 0, path );
 619     return drive;
 620 }
 621
 622 /* create devices for mapped drives */
 623 static void create_drive_devices(void)
 624 {
 625     char *path, *p, *link, *device;
 626     struct dos_drive *drive;
 627     struct volume *volume;
 628     unsigned int i;
 629     HKEY drives_key;
 630     enum device_type drive_type;
 631     WCHAR driveW[] = {'a',':',0};
 632
 633     if (!(path = get_dosdevices_path( &p ))) return;
 634     if (RegOpenKeyW( HKEY_LOCAL_MACHINE, drives_keyW, &drives_key )) drives_key = 0;
 635
 636     for (i = 0; i < MAX_DOS_DRIVES; i++)
 637     {
 638         p[0] = 'a' + i;
 639         p[2] = 0;
 640         if (!(link = read_symlink( path ))) continue;
 641         p[2] = ':';
 642         device = read_symlink( path );
 643
 644         drive_type = i < 2 ? DEVICE_FLOPPY : DEVICE_HARDDISK_VOL;
 645         if (drives_key)
 646         {
 647             WCHAR buffer[32];
 648             DWORD j, type, size = sizeof(buffer);
 649
 650             driveW[0] = 'a' + i;
 651             if (!RegQueryValueExW( drives_key, driveW, NULL, &type, (BYTE *)buffer, &size ) &&
 652                 type == REG_SZ)
 653             {
 654                 for (j = 0; j < sizeof(drive_types)/sizeof(drive_types[0]); j++)
 655                     if (drive_types[j][0] && !strcmpiW( buffer, drive_types[j] ))
 656                     {
 657                         drive_type = j;
 658                         break;
 659                     }
 660                 if (drive_type == DEVICE_FLOPPY && i >= 2) drive_type = DEVICE_HARDDISK;
 661             }
 662         }
 663
 664         volume = find_matching_volume( NULL, device, link, drive_type );
 665         if (!create_dos_device( volume, NULL, i, drive_type, &drive ))
 666         {
 667             /* don't reset uuid if we used an existing volume */
 668             const GUID *guid = volume ? NULL : get_default_uuid(i);
 669             set_volume_info( drive->volume, drive, device, link, drive_type, guid );
 670         }
 671         else
 672         {
 673             RtlFreeHeap( GetProcessHeap(), 0, link );
 674             RtlFreeHeap( GetProcessHeap(), 0, device );
 675         }
 676         if (volume) release_volume( volume );
 677     }
 678     RegCloseKey( drives_key );
 679     RtlFreeHeap( GetProcessHeap(), 0, path );
 680 }
 681
 682 /* create a new disk volume */
 683 NTSTATUS add_volume( const char *udi, const char *device, const char *mount_point,
 684                      enum device_type type, const GUID *guid )
 685 {
 686     struct volume *volume;
 687     NTSTATUS status = STATUS_SUCCESS;
 688
 689     TRACE( "adding %s device %s mount %s type %u uuid %s\n", debugstr_a(udi),
 690            debugstr_a(device), debugstr_a(mount_point), type, debugstr_guid(guid) );
 691
 692     EnterCriticalSection( &device_section );
 693     LIST_FOR_EACH_ENTRY( volume, &volumes_list, struct volume, entry )
 694         if (volume->udi && !strcmp( udi, volume->udi ))
 695         {
 696             grab_volume( volume );
 697             goto found;
 698         }
 699
 700     /* udi not found, search for a non-dynamic volume */
 701     if ((volume = find_matching_volume( udi, device, mount_point, type ))) set_volume_udi( volume, udi );
 702     else status = create_volume( udi, type, &volume );
 703
 704 found:
 705     if (!status) status = set_volume_info( volume, NULL, device, mount_point, type, guid );
 706     if (volume) release_volume( volume );
 707     LeaveCriticalSection( &device_section );
 708     return status;
 709 }
 710
 711 /* create a new disk volume */
 712 NTSTATUS remove_volume( const char *udi )
 713 {
 714     NTSTATUS status = STATUS_NO_SUCH_DEVICE;
 715     struct volume *volume;
 716
 717     EnterCriticalSection( &device_section );
 718     LIST_FOR_EACH_ENTRY( volume, &volumes_list, struct volume, entry )
 719     {
 720         if (!volume->udi || strcmp( udi, volume->udi )) continue;
 721         set_volume_udi( volume, NULL );
 722         status = STATUS_SUCCESS;
 723         break;
 724     }
 725     LeaveCriticalSection( &device_section );
 726     return status;
 727 }
 728
 729
 730 /* create a new dos drive */
 731 NTSTATUS add_dos_device( int letter, const char *udi, const char *device,
 732                          const char *mount_point, enum device_type type, const GUID *guid )
 733 {
 734     char *path, *p;
 735     HKEY hkey;
 736     NTSTATUS status = STATUS_SUCCESS;
 737     struct dos_drive *drive, *next;
 738     struct volume *volume;
 739     int notify = -1;
 740
 741     if (!(path = get_dosdevices_path( &p ))) return STATUS_NO_MEMORY;
 742
 743     EnterCriticalSection( &device_section );
 744     volume = find_matching_volume( udi, device, mount_point, type );
 745
 746     if (letter == -1)  /* auto-assign a letter */
 747     {
 748         letter = add_drive( device, type );
 749         if (letter == -1)
 750         {
 751             status = STATUS_OBJECT_NAME_COLLISION;
 752             goto done;
 753         }
 754
 755         LIST_FOR_EACH_ENTRY_SAFE( drive, next, &drives_list, struct dos_drive, entry )
 756         {
 757             if (drive->volume->udi && !strcmp( udi, drive->volume->udi )) goto found;
 758             if (drive->drive == letter) delete_dos_device( drive );
 759         }
 760     }
 761     else  /* simply reset the device symlink */
 762     {
 763         LIST_FOR_EACH_ENTRY( drive, &drives_list, struct dos_drive, entry )
 764             if (drive->drive == letter) break;
 765
 766         *p = 'a' + letter;
 767         if (&drive->entry == &drives_list) update_symlink( path, device, NULL );
 768         else
 769         {
 770             update_symlink( path, device, drive->volume->device->unix_device );
 771             delete_dos_device( drive );
 772         }
 773     }
 774
 775     if ((status = create_dos_device( volume, udi, letter, type, &drive ))) goto done;
 776
 777 found:
 778     if (!guid && !volume) guid = get_default_uuid( letter );
 779     if (!volume) volume = grab_volume( drive->volume );
 780     set_drive_info( drive, letter, volume );
 781     p[0] = 'a' + drive->drive;
 782     p[2] = 0;
 783     update_symlink( path, mount_point, volume->device->unix_mount );
 784     set_volume_info( volume, drive, device, mount_point, type, guid );
 785
 786     TRACE( "added device %c: udi %s for %s on %s type %u\n",
 787            'a' + drive->drive, wine_dbgstr_a(udi), wine_dbgstr_a(device),
 788            wine_dbgstr_a(mount_point), type );
 789
 790     /* hack: force the drive type in the registry */
 791     if (!RegCreateKeyW( HKEY_LOCAL_MACHINE, drives_keyW, &hkey ))
 792     {
 793         const WCHAR *type_name = drive_types[type];
 794         WCHAR name[] = {'a',':',0};
 795
 796         name[0] += drive->drive;
 797         if (!type_name[0] && type == DEVICE_HARDDISK) type_name = drive_types[DEVICE_FLOPPY];
 798         if (type_name[0])
 799             RegSetValueExW( hkey, name, 0, REG_SZ, (const BYTE *)type_name,
 800                             (strlenW(type_name) + 1) * sizeof(WCHAR) );
 801         else
 802             RegDeleteValueW( hkey, name );
 803         RegCloseKey( hkey );
 804     }
 805
 806     if (udi) notify = drive->drive;
 807
 808 done:
 809     if (volume) release_volume( volume );
 810     LeaveCriticalSection( &device_section );
 811     RtlFreeHeap( GetProcessHeap(), 0, path );
 812     if (notify != -1) send_notify( notify, DBT_DEVICEARRIVAL );
 813     return status;
 814 }
 815
 816 /* remove an existing dos drive, by letter or udi */
 817 NTSTATUS remove_dos_device( int letter, const char *udi )
 818 {
 819     NTSTATUS status = STATUS_NO_SUCH_DEVICE;
 820     HKEY hkey;
 821     struct dos_drive *drive;
 822     char *path, *p;
 823     int notify = -1;
 824
 825     EnterCriticalSection( &device_section );
 826     LIST_FOR_EACH_ENTRY( drive, &drives_list, struct dos_drive, entry )
 827     {
 828         if (udi)
 829         {
 830             if (!drive->volume->udi) continue;
 831             if (strcmp( udi, drive->volume->udi )) continue;
 832             set_volume_udi( drive->volume, NULL );
 833         }
 834         else if (drive->drive != letter) continue;
 835
 836         if ((path = get_dosdevices_path( &p )))
 837         {
 838             p[0] = 'a' + drive->drive;
 839             p[2] = 0;
 840             unlink( path );
 841             RtlFreeHeap( GetProcessHeap(), 0, path );
 842         }
 843
 844         /* clear the registry key too */
 845         if (!RegOpenKeyW( HKEY_LOCAL_MACHINE, drives_keyW, &hkey ))
 846         {
 847             WCHAR name[] = {'a',':',0};
 848             name[0] += drive->drive;
 849             RegDeleteValueW( hkey, name );
 850             RegCloseKey( hkey );
 851         }
 852
 853         if (udi && drive->volume->device->unix_mount) notify = drive->drive;
 854
 855         delete_dos_device( drive );
 856         status = STATUS_SUCCESS;
 857         break;
 858     }
 859     LeaveCriticalSection( &device_section );
 860     if (notify != -1) send_notify( notify, DBT_DEVICEREMOVECOMPLETE );
 861     return status;
 862 }
 863
 864 /* query information about an existing dos drive, by letter or udi */
 865 NTSTATUS query_dos_device( int letter, enum device_type *type, char **device, char **mount_point )
 866 {
 867     NTSTATUS status = STATUS_NO_SUCH_DEVICE;
 868     struct dos_drive *drive;
 869     struct disk_device *disk_device;
 870
 871     EnterCriticalSection( &device_section );
 872     LIST_FOR_EACH_ENTRY( drive, &drives_list, struct dos_drive, entry )
 873     {
 874         if (drive->drive != letter) continue;
 875         disk_device = drive->volume->device;
 876         if (type) *type = disk_device->type;
 877         if (device) *device = strdupA( disk_device->unix_device );
 878         if (mount_point) *mount_point = strdupA( disk_device->unix_mount );
 879         status = STATUS_SUCCESS;
 880         break;
 881     }
 882     LeaveCriticalSection( &device_section );
 883     return status;
 884 }
 885
 886 /* handler for ioctls on the harddisk device */
 887 static NTSTATUS WINAPI harddisk_ioctl( DEVICE_OBJECT *device, IRP *irp )
 888 {
 889     IO_STACK_LOCATION *irpsp = IoGetCurrentIrpStackLocation( irp );
 890     struct disk_device *dev = device->DeviceExtension;
 891
 892     TRACE( "ioctl %x insize %u outsize %u\n",
 893            irpsp->Parameters.DeviceIoControl.IoControlCode,
 894            irpsp->Parameters.DeviceIoControl.InputBufferLength,
 895            irpsp->Parameters.DeviceIoControl.OutputBufferLength );
 896
 897     EnterCriticalSection( &device_section );
 898
 899     switch(irpsp->Parameters.DeviceIoControl.IoControlCode)
 900     {
 901     case IOCTL_DISK_GET_DRIVE_GEOMETRY:
 902     {
 903         DISK_GEOMETRY info;
 904         DWORD len = min( sizeof(info), irpsp->Parameters.DeviceIoControl.OutputBufferLength );
 905
 906         info.Cylinders.QuadPart = 10000;
 907         info.MediaType = (dev->devnum.DeviceType == FILE_DEVICE_DISK) ? FixedMedia : RemovableMedia;
 908         info.TracksPerCylinder = 255;
 909         info.SectorsPerTrack = 63;
 910         info.BytesPerSector = 512;
 911         memcpy( irp->AssociatedIrp.SystemBuffer, &info, len );
 912         irp->IoStatus.Information = len;
 913         irp->IoStatus.u.Status = STATUS_SUCCESS;
 914         break;
 915     }
 916     case IOCTL_DISK_GET_DRIVE_GEOMETRY_EX:
 917     {
 918         DISK_GEOMETRY_EX info;
 919         DWORD len = min( sizeof(info), irpsp->Parameters.DeviceIoControl.OutputBufferLength );
 920
 921         FIXME("The DISK_PARTITION_INFO and DISK_DETECTION_INFO structures will not be filled\n");
 922
 923         info.Geometry.Cylinders.QuadPart = 10000;
 924         info.Geometry.MediaType = (dev->devnum.DeviceType == FILE_DEVICE_DISK) ? FixedMedia : RemovableMedia;
 925         info.Geometry.TracksPerCylinder = 255;
 926         info.Geometry.SectorsPerTrack = 63;
 927         info.Geometry.BytesPerSector = 512;
 928         info.DiskSize.QuadPart = info.Geometry.Cylinders.QuadPart * info.Geometry.TracksPerCylinder *
 929                                  info.Geometry.SectorsPerTrack * info.Geometry.BytesPerSector;
 930         info.Data[0]  = 0;
 931         memcpy( irp->AssociatedIrp.SystemBuffer, &info, len );
 932         irp->IoStatus.Information = len;
 933         irp->IoStatus.u.Status = STATUS_SUCCESS;
 934         break;
 935     }
 936     case IOCTL_STORAGE_GET_DEVICE_NUMBER:
 937     {
 938         DWORD len = min( sizeof(dev->devnum), irpsp->Parameters.DeviceIoControl.OutputBufferLength );
 939
 940         memcpy( irp->AssociatedIrp.SystemBuffer, &dev->devnum, len );
 941         irp->IoStatus.Information = len;
 942         irp->IoStatus.u.Status = STATUS_SUCCESS;
 943         break;
 944     }
 945     case IOCTL_CDROM_READ_TOC:
 946         irp->IoStatus.u.Status = STATUS_INVALID_DEVICE_REQUEST;
 947         break;
 948     case IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS:
 949     {
 950         DWORD len = min( 32, irpsp->Parameters.DeviceIoControl.OutputBufferLength );
 951
 952         FIXME( "returning zero-filled buffer for IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS\n" );
 953         memset( irp->AssociatedIrp.SystemBuffer, 0, len );
 954         irp->IoStatus.Information = len;
 955         irp->IoStatus.u.Status = STATUS_SUCCESS;
 956         break;
 957     }
 958     default:
 959     {
 960         ULONG code = irpsp->Parameters.DeviceIoControl.IoControlCode;
 961         FIXME("Unsupported ioctl %x (device=%x access=%x func=%x method=%x)\n",
 962               code, code >> 16, (code >> 14) & 3, (code >> 2) & 0xfff, code & 3);
 963         irp->IoStatus.u.Status = STATUS_NOT_SUPPORTED;
 964         break;
 965     }
 966     }
 967
 968     LeaveCriticalSection( &device_section );
 969     IoCompleteRequest( irp, IO_NO_INCREMENT );
 970     return irp->IoStatus.u.Status;
 971 }
 972
 973 /* driver entry point for the harddisk driver */
 974 NTSTATUS WINAPI harddisk_driver_entry( DRIVER_OBJECT *driver, UNICODE_STRING *path )
 975 {
 976     struct disk_device *device;
 977
 978     harddisk_driver = driver;
 979     driver->MajorFunction[IRP_MJ_DEVICE_CONTROL] = harddisk_ioctl;
 980
 981     /* create a harddisk0 device that isn't assigned to any drive */
 982     create_disk_device( DEVICE_HARDDISK, &device );
 983
 984     create_drive_devices();
 985
 986     return STATUS_SUCCESS;
 987 }