dlls/kernelbase/volume.c

   1 /*
   2  * Volume management functions
   3  *
   4  * Copyright 1993 Erik Bos
   5  * Copyright 1996, 2004 Alexandre Julliard
   6  * Copyright 1999 Petr Tomasek
   7  * Copyright 2000 Andreas Mohr
   8  * Copyright 2003 Eric Pouech
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with this library; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  23  */
  24
  25 #include <stdarg.h>
  26 #include <stdlib.h>
  27 #include <stdio.h>
  28
  29 #include "ntstatus.h"
  30 #define WIN32_NO_STATUS
  31 #include "windef.h"
  32 #include "winbase.h"
  33 #include "winnls.h"
  34 #include "winternl.h"
  35 #include "winioctl.h"
  36 #include "ntddcdrm.h"
  37 #define WINE_MOUNTMGR_EXTENSIONS
  38 #include "ddk/mountmgr.h"
  39 #include "ddk/wdm.h"
  40 #include "kernelbase.h"
  41 #include "wine/debug.h"
  42
  43 WINE_DEFAULT_DEBUG_CHANNEL(volume);
  44
  45 #define BLOCK_SIZE 2048
  46 #define SUPERBLOCK_SIZE BLOCK_SIZE
  47 #define SYMBOLIC_LINK_QUERY 0x0001
  48
  49 #define CDFRAMES_PERSEC         75
  50 #define CDFRAMES_PERMIN         (CDFRAMES_PERSEC * 60)
  51 #define FRAME_OF_ADDR(a)        ((a)[1] * CDFRAMES_PERMIN + (a)[2] * CDFRAMES_PERSEC + (a)[3])
  52 #define FRAME_OF_TOC(toc, idx)  FRAME_OF_ADDR((toc)->TrackData[(idx) - (toc)->FirstTrack].Address)
  53
  54 #define GETWORD(buf,off)  MAKEWORD(buf[(off)],buf[(off+1)])
  55 #define GETLONG(buf,off)  MAKELONG(GETWORD(buf,off),GETWORD(buf,off+2))
  56
  57 enum fs_type
  58 {
  59     FS_ERROR,    /* error accessing the device */
  60     FS_UNKNOWN,  /* unknown file system */
  61     FS_FAT1216,
  62     FS_FAT32,
  63     FS_ISO9660,
  64     FS_UDF       /* For reference [E] = Ecma-167.pdf, [U] = udf260.pdf */
  65 };
  66
  67 /* read the contents of an NT symlink object */
  68 static NTSTATUS read_nt_symlink( const WCHAR *name, WCHAR *target, DWORD size )
  69 {
  70     NTSTATUS status;
  71     OBJECT_ATTRIBUTES attr;
  72     UNICODE_STRING nameW;
  73     HANDLE handle;
  74
  75     attr.Length = sizeof(attr);
  76     attr.RootDirectory = 0;
  77     attr.Attributes = OBJ_CASE_INSENSITIVE;
  78     attr.ObjectName = &nameW;
  79     attr.SecurityDescriptor = NULL;
  80     attr.SecurityQualityOfService = NULL;
  81     RtlInitUnicodeString( &nameW, name );
  82
  83     if (!(status = NtOpenSymbolicLinkObject( &handle, SYMBOLIC_LINK_QUERY, &attr )))
  84     {
  85         UNICODE_STRING targetW;
  86         targetW.Buffer = target;
  87         targetW.MaximumLength = (size - 1) * sizeof(WCHAR);
  88         status = NtQuerySymbolicLinkObject( handle, &targetW, NULL );
  89         if (!status) target[targetW.Length / sizeof(WCHAR)] = 0;
  90         NtClose( handle );
  91     }
  92     return status;
  93 }
  94
  95 /* open a handle to a device root */
  96 static BOOL open_device_root( LPCWSTR root, HANDLE *handle )
  97 {
  98     UNICODE_STRING nt_name;
  99     OBJECT_ATTRIBUTES attr;
 100     IO_STATUS_BLOCK io;
 101     NTSTATUS status;
 102
 103     if (!root) root = L"\\";
 104     if (!RtlDosPathNameToNtPathName_U( root, &nt_name, NULL, NULL ))
 105     {
 106         SetLastError( ERROR_PATH_NOT_FOUND );
 107         return FALSE;
 108     }
 109     attr.Length = sizeof(attr);
 110     attr.RootDirectory = 0;
 111     attr.Attributes = OBJ_CASE_INSENSITIVE;
 112     attr.ObjectName = &nt_name;
 113     attr.SecurityDescriptor = NULL;
 114     attr.SecurityQualityOfService = NULL;
 115
 116     status = NtOpenFile( handle, SYNCHRONIZE, &attr, &io, 0,
 117                          FILE_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT );
 118     RtlFreeUnicodeString( &nt_name );
 119     return set_ntstatus( status );
 120 }
 121
 122 /* query the type of a drive from the mount manager */
 123 static DWORD get_mountmgr_drive_type( LPCWSTR root )
 124 {
 125     HANDLE mgr;
 126     struct mountmgr_unix_drive data;
 127     DWORD br;
 128
 129     memset( &data, 0, sizeof(data) );
 130     if (root) data.letter = root[0];
 131     else
 132     {
 133         WCHAR curdir[MAX_PATH];
 134         GetCurrentDirectoryW( MAX_PATH, curdir );
 135         if (curdir[1] != ':' || curdir[2] != '\\') return DRIVE_UNKNOWN;
 136         data.letter = curdir[0];
 137     }
 138
 139     mgr = CreateFileW( MOUNTMGR_DOS_DEVICE_NAME, GENERIC_READ,
 140                        FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, 0 );
 141     if (mgr == INVALID_HANDLE_VALUE) return DRIVE_UNKNOWN;
 142
 143     if (!DeviceIoControl( mgr, IOCTL_MOUNTMGR_QUERY_UNIX_DRIVE, &data, sizeof(data), &data,
 144                           sizeof(data), &br, NULL ) && GetLastError() != ERROR_MORE_DATA)
 145         data.type = DRIVE_UNKNOWN;
 146
 147     CloseHandle( mgr );
 148     return data.type;
 149 }
 150
 151
 152 /***********************************************************************
 153  *           GetVolumeInformationW   (kernelbase.@)
 154  */
 155 BOOL WINAPI DECLSPEC_HOTPATCH GetVolumeInformationW( LPCWSTR root, LPWSTR label, DWORD label_len,
 156                                                      DWORD *serial, DWORD *filename_len, DWORD *flags,
 157                                                      LPWSTR fsname, DWORD fsname_len )
 158 {
 159     HANDLE handle;
 160     NTSTATUS status;
 161     UNICODE_STRING nt_name;
 162     IO_STATUS_BLOCK io;
 163     OBJECT_ATTRIBUTES attr;
 164     unsigned int i;
 165     BOOL ret = FALSE;
 166
 167     if (!root) root = L"\\";
 168     if (!RtlDosPathNameToNtPathName_U( root, &nt_name, NULL, NULL ))
 169     {
 170         SetLastError( ERROR_PATH_NOT_FOUND );
 171         return FALSE;
 172     }
 173     /* there must be exactly one backslash in the name, at the end */
 174     for (i = 4; i < nt_name.Length / sizeof(WCHAR); i++) if (nt_name.Buffer[i] == '\\') break;
 175     if (i != nt_name.Length / sizeof(WCHAR) - 1)
 176     {
 177         /* check if root contains an explicit subdir */
 178         if (root[0] && root[1] == ':') root += 2;
 179         while (*root == '\\') root++;
 180         if (wcschr( root, '\\' ))
 181             SetLastError( ERROR_DIR_NOT_ROOT );
 182         else
 183             SetLastError( ERROR_INVALID_NAME );
 184         goto done;
 185     }
 186
 187     attr.Length = sizeof(attr);
 188     attr.RootDirectory = 0;
 189     attr.Attributes = OBJ_CASE_INSENSITIVE;
 190     attr.ObjectName = &nt_name;
 191     attr.SecurityDescriptor = NULL;
 192     attr.SecurityQualityOfService = NULL;
 193
 194     nt_name.Length -= sizeof(WCHAR);  /* without trailing slash */
 195     status = NtOpenFile( &handle, GENERIC_READ | SYNCHRONIZE, &attr, &io, FILE_SHARE_READ | FILE_SHARE_WRITE,
 196                          FILE_NON_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT );
 197     nt_name.Length += sizeof(WCHAR);
 198
 199     if (status)
 200     {
 201         TRACE( "cannot open device %s: %lx\n", debugstr_w(nt_name.Buffer), status );
 202         if (status == STATUS_ACCESS_DENIED)
 203             MESSAGE( "wine: Read access denied for device %s, FS volume label and serial are not available.\n", debugstr_w(nt_name.Buffer) );
 204         status = NtOpenFile( &handle, SYNCHRONIZE, &attr, &io, 0,
 205                                       FILE_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT );
 206     }
 207
 208     if (!set_ntstatus( status )) goto done;
 209
 210     ret = GetVolumeInformationByHandleW( handle, label, label_len, serial, filename_len, flags,
 211                                          fsname, fsname_len );
 212     NtClose( handle );
 213
 214 done:
 215     RtlFreeUnicodeString( &nt_name );
 216     return ret;
 217 }
 218
 219
 220 /***********************************************************************
 221  *           GetVolumeInformationA   (kernelbase.@)
 222  */
 223 BOOL WINAPI GetVolumeInformationA( LPCSTR root, LPSTR label,
 224                                    DWORD label_len, DWORD *serial,
 225                                    DWORD *filename_len, DWORD *flags,
 226                                    LPSTR fsname, DWORD fsname_len )
 227 {
 228     WCHAR *rootW = NULL;
 229     LPWSTR labelW, fsnameW;
 230     BOOL ret;
 231
 232     if (root && !(rootW = file_name_AtoW( root, FALSE ))) return FALSE;
 233
 234     labelW = label ? HeapAlloc(GetProcessHeap(), 0, label_len * sizeof(WCHAR)) : NULL;
 235     fsnameW = fsname ? HeapAlloc(GetProcessHeap(), 0, fsname_len * sizeof(WCHAR)) : NULL;
 236
 237     if ((ret = GetVolumeInformationW(rootW, labelW, label_len, serial,
 238                                     filename_len, flags, fsnameW, fsname_len)))
 239     {
 240         if (label) file_name_WtoA( labelW, -1, label, label_len );
 241         if (fsname) file_name_WtoA( fsnameW, -1, fsname, fsname_len );
 242     }
 243
 244     HeapFree( GetProcessHeap(), 0, labelW );
 245     HeapFree( GetProcessHeap(), 0, fsnameW );
 246     return ret;
 247 }
 248
 249
 250 /***********************************************************************
 251  *           GetVolumeNameForVolumeMountPointW   (kernelbase.@)
 252  */
 253 BOOL WINAPI GetVolumeNameForVolumeMountPointW( LPCWSTR path, LPWSTR volume, DWORD size )
 254 {
 255     MOUNTMGR_MOUNT_POINT *input = NULL, *o1;
 256     MOUNTMGR_MOUNT_POINTS *output = NULL;
 257     WCHAR *p;
 258     char *r;
 259     DWORD i, i_size = 1024, o_size = 1024;
 260     WCHAR *nonpersist_name;
 261     WCHAR symlink_name[MAX_PATH];
 262     NTSTATUS status;
 263     HANDLE mgr = INVALID_HANDLE_VALUE;
 264     BOOL ret = FALSE;
 265     DWORD br;
 266
 267     TRACE("(%s, %p, %lx)\n", debugstr_w(path), volume, size);
 268     if (path[lstrlenW(path)-1] != '\\')
 269     {
 270         SetLastError( ERROR_INVALID_NAME );
 271         return FALSE;
 272     }
 273
 274     if (size < 50)
 275     {
 276         SetLastError( ERROR_FILENAME_EXCED_RANGE );
 277         return FALSE;
 278     }
 279     /* if length of input is > 3 then it must be a mounted folder */
 280     if (lstrlenW(path) > 3)
 281     {
 282         FIXME("Mounted Folders are not yet supported\n");
 283         SetLastError( ERROR_NOT_A_REPARSE_POINT );
 284         return FALSE;
 285     }
 286
 287     mgr = CreateFileW( MOUNTMGR_DOS_DEVICE_NAME, 0, FILE_SHARE_READ,
 288                         NULL, OPEN_EXISTING, 0, 0 );
 289     if (mgr == INVALID_HANDLE_VALUE) return FALSE;
 290
 291     if (!(input = HeapAlloc( GetProcessHeap(), 0, i_size )))
 292     {
 293         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 294         goto err_ret;
 295     }
 296
 297     if (!(output = HeapAlloc( GetProcessHeap(), 0, o_size )))
 298     {
 299         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 300         goto err_ret;
 301     }
 302
 303     /* construct the symlink name as "\DosDevices\C:" */
 304     lstrcpyW( symlink_name, L"\\DosDevices\\" );
 305     lstrcatW( symlink_name, path );
 306     symlink_name[lstrlenW(symlink_name)-1] = 0;
 307
 308     /* Take the mount point and get the "nonpersistent name" */
 309     /* We will then take that and get the volume name        */
 310     nonpersist_name = (WCHAR *)(input + 1);
 311     status = read_nt_symlink( symlink_name, nonpersist_name, (i_size - sizeof(*input)) / sizeof(WCHAR) );
 312     TRACE("read_nt_symlink got stat=%lx, for %s, got <%s>\n", status,
 313             debugstr_w(symlink_name), debugstr_w(nonpersist_name));
 314     if (status != STATUS_SUCCESS)
 315     {
 316         SetLastError( ERROR_FILE_NOT_FOUND );
 317         goto err_ret;
 318     }
 319
 320     /* Now take the "nonpersistent name" and ask the mountmgr  */
 321     /* to give us all the mount points.  One of them will be   */
 322     /* the volume name  (format of \??\Volume{).               */
 323     memset( input, 0, sizeof(*input) );  /* clear all input parameters */
 324     input->DeviceNameOffset = sizeof(*input);
 325     input->DeviceNameLength = lstrlenW( nonpersist_name) * sizeof(WCHAR);
 326     i_size = input->DeviceNameOffset + input->DeviceNameLength;
 327
 328     output->Size = o_size;
 329
 330     /* now get the true volume name from the mountmgr   */
 331     if (!DeviceIoControl( mgr, IOCTL_MOUNTMGR_QUERY_POINTS, input, i_size,
 332                         output, o_size, &br, NULL ))
 333         goto err_ret;
 334
 335     /* Verify and return the data, note string is not null terminated  */
 336     TRACE("found %ld matching mount points\n", output->NumberOfMountPoints);
 337     if (output->NumberOfMountPoints < 1)
 338     {
 339         SetLastError( ERROR_NO_VOLUME_ID );
 340         goto err_ret;
 341     }
 342     o1 = &output->MountPoints[0];
 343
 344     /* look for the volume name in returned values  */
 345     for(i=0;i<output->NumberOfMountPoints;i++)
 346     {
 347         p = (WCHAR*)((char *)output + o1->SymbolicLinkNameOffset);
 348         r = (char *)output + o1->UniqueIdOffset;
 349         TRACE("found symlink=%s, unique=%s, devname=%s\n",
 350             debugstr_wn(p, o1->SymbolicLinkNameLength/sizeof(WCHAR)),
 351             debugstr_an(r, o1->UniqueIdLength),
 352             debugstr_wn((WCHAR*)((char *)output + o1->DeviceNameOffset),
 353                             o1->DeviceNameLength/sizeof(WCHAR)));
 354
 355         if (!wcsncmp( p, L"\\??\\Volume{", wcslen(L"\\??\\Volume{") ))
 356         {
 357             /* is there space in the return variable ?? */
 358             if ((o1->SymbolicLinkNameLength/sizeof(WCHAR))+2 > size)
 359             {
 360                 SetLastError( ERROR_FILENAME_EXCED_RANGE );
 361                 goto err_ret;
 362             }
 363             memcpy( volume, p, o1->SymbolicLinkNameLength );
 364             volume[o1->SymbolicLinkNameLength / sizeof(WCHAR)] = 0;
 365             lstrcatW( volume, L"\\" );
 366             /* change second char from '?' to '\'  */
 367             volume[1] = '\\';
 368             ret = TRUE;
 369             break;
 370         }
 371         o1++;
 372     }
 373
 374 err_ret:
 375     HeapFree( GetProcessHeap(), 0, input );
 376     HeapFree( GetProcessHeap(), 0, output );
 377     CloseHandle( mgr );
 378     return ret;
 379 }
 380
 381
 382 /***********************************************************************
 383  *           DefineDosDeviceW       (kernelbase.@)
 384  */
 385 BOOL WINAPI DECLSPEC_HOTPATCH DefineDosDeviceW( DWORD flags, const WCHAR *device, const WCHAR *target )
 386 {
 387     WCHAR link_name[15] = L"\\DosDevices\\";
 388     UNICODE_STRING nt_name, nt_target;
 389     OBJECT_ATTRIBUTES attr;
 390     NTSTATUS status;
 391     HANDLE handle;
 392
 393     TRACE("%#lx, %s, %s\n", flags, debugstr_w(device), debugstr_w(target));
 394
 395     if (flags & ~(DDD_RAW_TARGET_PATH | DDD_REMOVE_DEFINITION))
 396         FIXME("Ignoring flags %#lx.\n", flags & ~(DDD_RAW_TARGET_PATH | DDD_REMOVE_DEFINITION));
 397
 398     lstrcatW( link_name, device );
 399     RtlInitUnicodeString( &nt_name, link_name );
 400     InitializeObjectAttributes( &attr, &nt_name, OBJ_CASE_INSENSITIVE | OBJ_PERMANENT, 0, NULL );
 401     if (flags & DDD_REMOVE_DEFINITION)
 402     {
 403         if (!set_ntstatus( NtOpenSymbolicLinkObject( &handle, DELETE, &attr ) ))
 404             return FALSE;
 405
 406         status = NtMakeTemporaryObject( handle );
 407         NtClose( handle );
 408
 409         return set_ntstatus( status );
 410     }
 411
 412     if (!(flags & DDD_RAW_TARGET_PATH))
 413     {
 414         if (!RtlDosPathNameToNtPathName_U( target, &nt_target, NULL, NULL))
 415         {
 416             SetLastError( ERROR_PATH_NOT_FOUND );
 417             return FALSE;
 418         }
 419     }
 420     else
 421         RtlInitUnicodeString( &nt_target, target );
 422
 423     if (!(status = NtCreateSymbolicLinkObject( &handle, SYMBOLIC_LINK_ALL_ACCESS, &attr, &nt_target )))
 424         NtClose( handle );
 425     return set_ntstatus( status );
 426 }
 427
 428
 429 /***********************************************************************
 430  *           QueryDosDeviceW   (kernelbase.@)
 431  *
 432  * returns array of strings terminated by \0, terminated by \0
 433  */
 434 DWORD WINAPI QueryDosDeviceW( LPCWSTR devname, LPWSTR target, DWORD bufsize )
 435 {
 436     NTSTATUS status;
 437
 438     if (!bufsize)
 439     {
 440         SetLastError( ERROR_INSUFFICIENT_BUFFER );
 441         return 0;
 442     }
 443
 444     if (devname)
 445     {
 446         WCHAR name[8];
 447         WCHAR *buffer;
 448         DWORD dosdev, ret = 0;
 449
 450         if ((dosdev = RtlIsDosDeviceName_U( devname )))
 451         {
 452             memcpy( name, devname + HIWORD(dosdev)/sizeof(WCHAR), LOWORD(dosdev) );
 453             name[LOWORD(dosdev)/sizeof(WCHAR)] = 0;
 454             devname = name;
 455         }
 456
 457         if (!(buffer = HeapAlloc( GetProcessHeap(), 0, sizeof(L"\\DosDevices\\") + lstrlenW(devname)*sizeof(WCHAR) )))
 458         {
 459             SetLastError( ERROR_OUTOFMEMORY );
 460             return 0;
 461         }
 462         lstrcpyW( buffer, L"\\DosDevices\\" );
 463         lstrcatW( buffer, devname );
 464         status = read_nt_symlink( buffer, target, bufsize );
 465         HeapFree( GetProcessHeap(), 0, buffer );
 466         if (!set_ntstatus( status )) return 0;
 467         ret = lstrlenW( target ) + 1;
 468         if (ret < bufsize) target[ret++] = 0;  /* add an extra null */
 469         return ret;
 470     }
 471     else  /* return a list of all devices */
 472     {
 473         UNICODE_STRING nt_name = RTL_CONSTANT_STRING( L"\\DosDevices" );
 474         OBJECT_ATTRIBUTES attr;
 475         HANDLE handle;
 476         WCHAR *p = target;
 477
 478         attr.Length = sizeof(attr);
 479         attr.RootDirectory = 0;
 480         attr.ObjectName = &nt_name;
 481         attr.Attributes = OBJ_CASE_INSENSITIVE;
 482         attr.SecurityDescriptor = NULL;
 483         attr.SecurityQualityOfService = NULL;
 484         status = NtOpenDirectoryObject( &handle, FILE_LIST_DIRECTORY, &attr );
 485         if (!status)
 486         {
 487             char data[1024];
 488             DIRECTORY_BASIC_INFORMATION *info = (DIRECTORY_BASIC_INFORMATION *)data;
 489             ULONG ctx = 0, len;
 490
 491             while (!NtQueryDirectoryObject( handle, info, sizeof(data), 1, 0, &ctx, &len ))
 492             {
 493                 if (p + info->ObjectName.Length/sizeof(WCHAR) + 1 >= target + bufsize)
 494                 {
 495                     SetLastError( ERROR_INSUFFICIENT_BUFFER );
 496                     NtClose( handle );
 497                     return 0;
 498                 }
 499                 memcpy( p, info->ObjectName.Buffer, info->ObjectName.Length );
 500                 p += info->ObjectName.Length/sizeof(WCHAR);
 501                 *p++ = 0;
 502             }
 503             NtClose( handle );
 504         }
 505
 506         *p++ = 0;  /* terminating null */
 507         return p - target;
 508     }
 509 }
 510
 511
 512 /***********************************************************************
 513  *           GetLogicalDrives   (kernelbase.@)
 514  */
 515 DWORD WINAPI DECLSPEC_HOTPATCH GetLogicalDrives(void)
 516 {
 517     OBJECT_ATTRIBUTES attr;
 518     UNICODE_STRING nt_name = RTL_CONSTANT_STRING( L"\\DosDevices\\" );
 519     DWORD bitmask = 0;
 520     NTSTATUS status;
 521     HANDLE handle;
 522
 523     nt_name.Length -= sizeof(WCHAR);  /* without trailing slash */
 524     attr.Length = sizeof(attr);
 525     attr.RootDirectory = 0;
 526     attr.ObjectName = &nt_name;
 527     attr.Attributes = OBJ_CASE_INSENSITIVE;
 528     attr.SecurityDescriptor = NULL;
 529     attr.SecurityQualityOfService = NULL;
 530     status = NtOpenDirectoryObject( &handle, FILE_LIST_DIRECTORY, &attr );
 531     if (!status)
 532     {
 533         char data[1024];
 534         DIRECTORY_BASIC_INFORMATION *info = (DIRECTORY_BASIC_INFORMATION *)data;
 535         ULONG ctx = 0, len;
 536
 537         while (!NtQueryDirectoryObject( handle, info, sizeof(data), 1, 0, &ctx, &len ))
 538             if(info->ObjectName.Length == 2*sizeof(WCHAR) && info->ObjectName.Buffer[1] == ':')
 539                 bitmask |= 1 << (info->ObjectName.Buffer[0] - 'A');
 540
 541         NtClose( handle );
 542     }
 543
 544     return bitmask;
 545 }
 546
 547
 548 /***********************************************************************
 549  *           GetLogicalDriveStringsW   (kernelbase.@)
 550  */
 551 UINT WINAPI DECLSPEC_HOTPATCH GetLogicalDriveStringsW( UINT len, LPWSTR buffer )
 552 {
 553     DWORD drives = GetLogicalDrives();
 554     UINT drive, count;
 555
 556     for (drive = count = 0; drive < 26; drive++) if (drives & (1 << drive)) count++;
 557     if ((count * 4) + 1 > len) return count * 4 + 1;
 558
 559     for (drive = 0; drive < 26; drive++)
 560     {
 561         if (drives & (1 << drive))
 562         {
 563             *buffer++ = 'A' + drive;
 564             *buffer++ = ':';
 565             *buffer++ = '\\';
 566             *buffer++ = 0;
 567         }
 568     }
 569     *buffer = 0;
 570     return count * 4;
 571 }
 572
 573
 574 /***********************************************************************
 575  *           GetDriveTypeW   (kernelbase.@)
 576  */
 577 UINT WINAPI DECLSPEC_HOTPATCH GetDriveTypeW( LPCWSTR root )
 578 {
 579     FILE_FS_DEVICE_INFORMATION info;
 580     IO_STATUS_BLOCK io;
 581     NTSTATUS status;
 582     HANDLE handle;
 583     UINT ret;
 584
 585     if (!open_device_root( root, &handle ))
 586     {
 587         /* CD ROM devices do not necessarily have a volume, but a drive type */
 588         ret = get_mountmgr_drive_type( root );
 589         if (ret == DRIVE_CDROM || ret == DRIVE_REMOVABLE)
 590             return ret;
 591
 592         return DRIVE_NO_ROOT_DIR;
 593     }
 594
 595     status = NtQueryVolumeInformationFile( handle, &io, &info, sizeof(info), FileFsDeviceInformation );
 596     NtClose( handle );
 597     if (status != STATUS_SUCCESS)
 598     {
 599         SetLastError( RtlNtStatusToDosError(status) );
 600         ret = DRIVE_UNKNOWN;
 601     }
 602     else
 603     {
 604         switch (info.DeviceType)
 605         {
 606         case FILE_DEVICE_CD_ROM_FILE_SYSTEM:  ret = DRIVE_CDROM; break;
 607         case FILE_DEVICE_VIRTUAL_DISK:        ret = DRIVE_RAMDISK; break;
 608         case FILE_DEVICE_NETWORK_FILE_SYSTEM: ret = DRIVE_REMOTE; break;
 609         case FILE_DEVICE_DISK_FILE_SYSTEM:
 610             if (info.Characteristics & FILE_REMOTE_DEVICE) ret = DRIVE_REMOTE;
 611             else if (info.Characteristics & FILE_REMOVABLE_MEDIA) ret = DRIVE_REMOVABLE;
 612             else if ((ret = get_mountmgr_drive_type( root )) == DRIVE_UNKNOWN) ret = DRIVE_FIXED;
 613             break;
 614         default:
 615             ret = DRIVE_UNKNOWN;
 616             break;
 617         }
 618     }
 619     TRACE( "%s -> %d\n", debugstr_w(root), ret );
 620     return ret;
 621 }
 622
 623
 624 /***********************************************************************
 625  *           GetDriveTypeA   (kernelbase.@)
 626  */
 627 UINT WINAPI DECLSPEC_HOTPATCH GetDriveTypeA( LPCSTR root )
 628 {
 629     WCHAR *rootW = NULL;
 630
 631     if (root && !(rootW = file_name_AtoW( root, FALSE ))) return DRIVE_NO_ROOT_DIR;
 632     return GetDriveTypeW( rootW );
 633 }
 634
 635
 636 /***********************************************************************
 637  *           GetDiskFreeSpaceExW   (kernelbase.@)
 638  */
 639 BOOL WINAPI DECLSPEC_HOTPATCH GetDiskFreeSpaceExW( LPCWSTR root, PULARGE_INTEGER avail,
 640                                                    PULARGE_INTEGER total, PULARGE_INTEGER totalfree )
 641 {
 642     FILE_FS_SIZE_INFORMATION info;
 643     IO_STATUS_BLOCK io;
 644     NTSTATUS status;
 645     HANDLE handle;
 646     UINT units;
 647
 648     TRACE( "%s,%p,%p,%p\n", debugstr_w(root), avail, total, totalfree );
 649
 650     if (!open_device_root( root, &handle )) return FALSE;
 651
 652     status = NtQueryVolumeInformationFile( handle, &io, &info, sizeof(info), FileFsSizeInformation );
 653     NtClose( handle );
 654     if (!set_ntstatus( status )) return FALSE;
 655
 656     units = info.SectorsPerAllocationUnit * info.BytesPerSector;
 657     if (total) total->QuadPart = info.TotalAllocationUnits.QuadPart * units;
 658     if (totalfree) totalfree->QuadPart = info.AvailableAllocationUnits.QuadPart * units;
 659     /* FIXME: this one should take quotas into account */
 660     if (avail) avail->QuadPart = info.AvailableAllocationUnits.QuadPart * units;
 661     return TRUE;
 662 }
 663
 664
 665 /***********************************************************************
 666  *           GetDiskFreeSpaceExA   (kernelbase.@)
 667  */
 668 BOOL WINAPI DECLSPEC_HOTPATCH GetDiskFreeSpaceExA( LPCSTR root, PULARGE_INTEGER avail,
 669                                                    PULARGE_INTEGER total, PULARGE_INTEGER totalfree )
 670 {
 671     WCHAR *rootW = NULL;
 672
 673     if (root && !(rootW = file_name_AtoW( root, FALSE ))) return FALSE;
 674     return GetDiskFreeSpaceExW( rootW, avail, total, totalfree );
 675 }
 676
 677
 678 /***********************************************************************
 679  *           GetDiskFreeSpaceW   (kernelbase.@)
 680  */
 681 BOOL WINAPI DECLSPEC_HOTPATCH GetDiskFreeSpaceW( LPCWSTR root, LPDWORD cluster_sectors,
 682                                                  LPDWORD sector_bytes, LPDWORD free_clusters,
 683                                                  LPDWORD total_clusters )
 684 {
 685     FILE_FS_SIZE_INFORMATION info;
 686     IO_STATUS_BLOCK io;
 687     NTSTATUS status;
 688     HANDLE handle;
 689     UINT units;
 690
 691     TRACE( "%s,%p,%p,%p,%p\n", debugstr_w(root),
 692            cluster_sectors, sector_bytes, free_clusters, total_clusters );
 693
 694     if (!open_device_root( root, &handle )) return FALSE;
 695
 696     status = NtQueryVolumeInformationFile( handle, &io, &info, sizeof(info), FileFsSizeInformation );
 697     NtClose( handle );
 698     if (!set_ntstatus( status )) return FALSE;
 699
 700     units = info.SectorsPerAllocationUnit * info.BytesPerSector;
 701
 702     if( GetVersion() & 0x80000000) {    /* win3.x, 9x, ME */
 703         /* cap the size and available at 2GB as per specs */
 704         if (info.TotalAllocationUnits.QuadPart * units > 0x7fffffff) {
 705             info.TotalAllocationUnits.QuadPart = 0x7fffffff / units;
 706             if (info.AvailableAllocationUnits.QuadPart * units > 0x7fffffff)
 707                 info.AvailableAllocationUnits.QuadPart = 0x7fffffff / units;
 708         }
 709         /* nr. of clusters is always <= 65335 */
 710         while( info.TotalAllocationUnits.QuadPart > 65535 ) {
 711             info.TotalAllocationUnits.QuadPart /= 2;
 712             info.AvailableAllocationUnits.QuadPart /= 2;
 713             info.SectorsPerAllocationUnit *= 2;
 714         }
 715     }
 716
 717     if (cluster_sectors) *cluster_sectors = info.SectorsPerAllocationUnit;
 718     if (sector_bytes) *sector_bytes = info.BytesPerSector;
 719     if (free_clusters) *free_clusters = info.AvailableAllocationUnits.u.LowPart;
 720     if (total_clusters) *total_clusters = info.TotalAllocationUnits.u.LowPart;
 721     TRACE("%#08lx, %#08lx, %#08lx, %#08lx\n", info.SectorsPerAllocationUnit, info.BytesPerSector,
 722           info.AvailableAllocationUnits.u.LowPart, info.TotalAllocationUnits.u.LowPart);
 723     return TRUE;
 724 }
 725
 726
 727 /***********************************************************************
 728  *           GetDiskFreeSpaceA   (kernelbase.@)
 729  */
 730 BOOL WINAPI DECLSPEC_HOTPATCH GetDiskFreeSpaceA( LPCSTR root, LPDWORD cluster_sectors,
 731                                                  LPDWORD sector_bytes, LPDWORD free_clusters,
 732                                                  LPDWORD total_clusters )
 733 {
 734     WCHAR *rootW = NULL;
 735
 736     if (root && !(rootW = file_name_AtoW( root, FALSE ))) return FALSE;
 737     return GetDiskFreeSpaceW( rootW, cluster_sectors, sector_bytes, free_clusters, total_clusters );
 738 }
 739
 740
 741 static BOOL is_dos_path( const UNICODE_STRING *path )
 742 {
 743     static const WCHAR global_prefix[4] = {'\\','?','?','\\'};
 744     return path->Length >= 7 * sizeof(WCHAR)
 745             && !memcmp(path->Buffer, global_prefix, sizeof(global_prefix))
 746             && path->Buffer[5] == ':' && path->Buffer[6] == '\\';
 747 }
 748
 749 /* resolve all symlinks in a path in-place; return FALSE if allocation failed */
 750 static BOOL resolve_symlink( UNICODE_STRING *path )
 751 {
 752     OBJECT_NAME_INFORMATION *info;
 753     OBJECT_ATTRIBUTES attr;
 754     IO_STATUS_BLOCK io;
 755     NTSTATUS status;
 756     HANDLE file;
 757     ULONG size;
 758
 759     InitializeObjectAttributes( &attr, path, OBJ_CASE_INSENSITIVE, 0, NULL );
 760     if (NtOpenFile( &file, SYNCHRONIZE, &attr, &io, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
 761             FILE_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT ))
 762         return TRUE;
 763
 764     if (NtQueryObject( file, ObjectNameInformation, NULL, 0, &size ) != STATUS_INFO_LENGTH_MISMATCH)
 765     {
 766         NtClose( file );
 767         return TRUE;
 768     }
 769
 770     if (!(info = HeapAlloc( GetProcessHeap(), 0, size )))
 771     {
 772         NtClose( file );
 773         return FALSE;
 774     }
 775
 776     status = NtQueryObject( file, ObjectNameInformation, info, size, NULL );
 777     NtClose( file );
 778     if (status)
 779         return TRUE;
 780
 781     RtlFreeUnicodeString( path );
 782     status = RtlDuplicateUnicodeString( 0, &info->Name, path );
 783     HeapFree( GetProcessHeap(), 0, info );
 784     return !status;
 785 }
 786
 787 /***********************************************************************
 788  *           GetVolumePathNameW   (kernelbase.@)
 789  */
 790 BOOL WINAPI DECLSPEC_HOTPATCH GetVolumePathNameW( const WCHAR *path, WCHAR *volume_path, DWORD length )
 791 {
 792     FILE_ATTRIBUTE_TAG_INFORMATION attr_info;
 793     FILE_BASIC_INFORMATION basic_info;
 794     OBJECT_ATTRIBUTES attr;
 795     UNICODE_STRING nt_name;
 796     NTSTATUS status;
 797
 798     if (path && !wcsncmp(path, L"\\??\\", 4))
 799     {
 800         WCHAR current_drive[MAX_PATH];
 801
 802         GetCurrentDirectoryW( ARRAY_SIZE(current_drive), current_drive );
 803         if (length >= 3)
 804         {
 805             WCHAR ret_path[4] = {current_drive[0], ':', '\\', 0};
 806             lstrcpynW( volume_path, ret_path, length );
 807             return TRUE;
 808         }
 809
 810         SetLastError( ERROR_FILENAME_EXCED_RANGE );
 811         return FALSE;
 812     }
 813
 814     if (!volume_path || !length || !RtlDosPathNameToNtPathName_U( path, &nt_name, NULL, NULL ))
 815     {
 816         SetLastError( ERROR_INVALID_PARAMETER );
 817         return FALSE;
 818     }
 819
 820     if (!is_dos_path( &nt_name ))
 821     {
 822         RtlFreeUnicodeString( &nt_name );
 823         WARN("invalid path %s\n", debugstr_w(path));
 824         SetLastError( ERROR_INVALID_NAME );
 825         return FALSE;
 826     }
 827
 828     InitializeObjectAttributes( &attr, &nt_name, OBJ_CASE_INSENSITIVE, 0, NULL );
 829
 830     while (nt_name.Length > 7 * sizeof(WCHAR))
 831     {
 832         IO_STATUS_BLOCK io;
 833         HANDLE file;
 834
 835         if (!NtQueryAttributesFile( &attr, &basic_info )
 836                 && (basic_info.FileAttributes & FILE_ATTRIBUTE_REPARSE_POINT)
 837                 && (basic_info.FileAttributes & FILE_ATTRIBUTE_DIRECTORY)
 838                 && !NtOpenFile( &file, SYNCHRONIZE | FILE_READ_ATTRIBUTES, &attr, &io,
 839                         FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
 840                         FILE_OPEN_REPARSE_POINT | FILE_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT ))
 841         {
 842             status = NtQueryInformationFile( file, &io, &attr_info,
 843                     sizeof(attr_info), FileAttributeTagInformation );
 844             NtClose( file );
 845             if (!status)
 846             {
 847
 848                 if (attr_info.ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
 849                     break;
 850
 851                 if (!resolve_symlink( &nt_name ))
 852                 {
 853                     SetLastError( ERROR_OUTOFMEMORY );
 854                     return FALSE;
 855                 }
 856             }
 857         }
 858
 859         if (nt_name.Buffer[(nt_name.Length / sizeof(WCHAR)) - 1] == '\\')
 860             nt_name.Length -= sizeof(WCHAR);
 861         while (nt_name.Length && nt_name.Buffer[(nt_name.Length / sizeof(WCHAR)) - 1] != '\\')
 862             nt_name.Length -= sizeof(WCHAR);
 863     }
 864
 865     nt_name.Buffer[nt_name.Length / sizeof(WCHAR)] = 0;
 866
 867     if (NtQueryAttributesFile( &attr, &basic_info ))
 868     {
 869         RtlFreeUnicodeString( &nt_name );
 870         WARN("nonexistent path %s -> %s\n", debugstr_w(path), debugstr_w( nt_name.Buffer ));
 871         SetLastError( ERROR_FILE_NOT_FOUND );
 872         return FALSE;
 873     }
 874
 875     if (!wcsncmp(path, L"\\\\.\\", 4) || !wcsncmp(path, L"\\\\?\\", 4))
 876     {
 877         if (length >= nt_name.Length / sizeof(WCHAR))
 878         {
 879             memcpy(volume_path, path, 4 * sizeof(WCHAR));
 880             lstrcpynW( volume_path + 4, nt_name.Buffer + 4, length - 4 );
 881
 882             TRACE("%s -> %s\n", debugstr_w(path), debugstr_w(volume_path));
 883
 884             RtlFreeUnicodeString( &nt_name );
 885             return TRUE;
 886         }
 887     }
 888     else if (length >= (nt_name.Length / sizeof(WCHAR)) - 4)
 889     {
 890         lstrcpynW( volume_path, nt_name.Buffer + 4, length );
 891         volume_path[0] = towupper(volume_path[0]);
 892
 893         TRACE("%s -> %s\n", debugstr_w(path), debugstr_w(volume_path));
 894
 895         RtlFreeUnicodeString( &nt_name );
 896         return TRUE;
 897     }
 898
 899     RtlFreeUnicodeString( &nt_name );
 900     SetLastError( ERROR_FILENAME_EXCED_RANGE );
 901     return FALSE;
 902 }
 903
 904
 905 static MOUNTMGR_MOUNT_POINTS *query_mount_points( HANDLE mgr, MOUNTMGR_MOUNT_POINT *input, DWORD insize )
 906 {
 907     MOUNTMGR_MOUNT_POINTS *output;
 908     DWORD outsize = 1024;
 909     DWORD br;
 910
 911     for (;;)
 912     {
 913         if (!(output = HeapAlloc( GetProcessHeap(), 0, outsize )))
 914         {
 915             SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 916             return NULL;
 917         }
 918         if (DeviceIoControl( mgr, IOCTL_MOUNTMGR_QUERY_POINTS, input, insize, output, outsize, &br, NULL )) break;
 919         outsize = output->Size;
 920         HeapFree( GetProcessHeap(), 0, output );
 921         if (GetLastError() != ERROR_MORE_DATA) return NULL;
 922     }
 923     return output;
 924 }
 925
 926 /***********************************************************************
 927  *           GetVolumePathNamesForVolumeNameW   (kernelbase.@)
 928  */
 929 BOOL WINAPI DECLSPEC_HOTPATCH GetVolumePathNamesForVolumeNameW( LPCWSTR volumename, LPWSTR volumepathname,
 930                                                                 DWORD buflen, PDWORD returnlen )
 931 {
 932     static const WCHAR dosdevicesW[] = {'\\','D','o','s','D','e','v','i','c','e','s','\\'};
 933     HANDLE mgr;
 934     DWORD len, size;
 935     MOUNTMGR_MOUNT_POINT *spec;
 936     MOUNTMGR_MOUNT_POINTS *link, *target = NULL;
 937     WCHAR *name, *path;
 938     BOOL ret = FALSE;
 939     UINT i, j;
 940
 941     TRACE("%s, %p, %lu, %p\n", debugstr_w(volumename), volumepathname, buflen, returnlen);
 942
 943     if (!volumename || (len = lstrlenW( volumename )) != 49)
 944     {
 945         SetLastError( ERROR_INVALID_NAME );
 946         return FALSE;
 947     }
 948     mgr = CreateFileW( MOUNTMGR_DOS_DEVICE_NAME, 0, FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, 0 );
 949     if (mgr == INVALID_HANDLE_VALUE) return FALSE;
 950
 951     size = sizeof(*spec) + sizeof(WCHAR) * (len - 1); /* remove trailing backslash */
 952     if (!(spec = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, size ))) goto done;
 953     spec->SymbolicLinkNameOffset = sizeof(*spec);
 954     spec->SymbolicLinkNameLength = size - sizeof(*spec);
 955     name = (WCHAR *)((char *)spec + spec->SymbolicLinkNameOffset);
 956     memcpy( name, volumename, size - sizeof(*spec) );
 957     name[1] = '?'; /* map \\?\ to \??\ */
 958
 959     target = query_mount_points( mgr, spec, size );
 960     HeapFree( GetProcessHeap(), 0, spec );
 961     if (!target)
 962     {
 963         goto done;
 964     }
 965     if (!target->NumberOfMountPoints)
 966     {
 967         SetLastError( ERROR_FILE_NOT_FOUND );
 968         goto done;
 969     }
 970     len = 0;
 971     path = volumepathname;
 972     for (i = 0; i < target->NumberOfMountPoints; i++)
 973     {
 974         link = NULL;
 975         if (target->MountPoints[i].DeviceNameOffset)
 976         {
 977             const WCHAR *device = (const WCHAR *)((const char *)target + target->MountPoints[i].DeviceNameOffset);
 978             USHORT device_len = target->MountPoints[i].DeviceNameLength;
 979
 980             size = sizeof(*spec) + device_len;
 981             if (!(spec = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, size ))) goto done;
 982             spec->DeviceNameOffset = sizeof(*spec);
 983             spec->DeviceNameLength = device_len;
 984             memcpy( (char *)spec + spec->DeviceNameOffset, device, device_len );
 985
 986             link = query_mount_points( mgr, spec, size );
 987             HeapFree( GetProcessHeap(), 0, spec );
 988         }
 989         else if (target->MountPoints[i].UniqueIdOffset)
 990         {
 991             const WCHAR *id = (const WCHAR *)((const char *)target + target->MountPoints[i].UniqueIdOffset);
 992             USHORT id_len = target->MountPoints[i].UniqueIdLength;
 993
 994             size = sizeof(*spec) + id_len;
 995             if (!(spec = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, size ))) goto done;
 996             spec->UniqueIdOffset = sizeof(*spec);
 997             spec->UniqueIdLength = id_len;
 998             memcpy( (char *)spec + spec->UniqueIdOffset, id, id_len );
 999
1000             link = query_mount_points( mgr, spec, size );
1001             HeapFree( GetProcessHeap(), 0, spec );
1002         }
1003         if (!link) continue;
1004         for (j = 0; j < link->NumberOfMountPoints; j++)
1005         {
1006             const WCHAR *linkname;
1007
1008             if (!link->MountPoints[j].SymbolicLinkNameOffset) continue;
1009             linkname = (const WCHAR *)((const char *)link + link->MountPoints[j].SymbolicLinkNameOffset);
1010
1011             if (link->MountPoints[j].SymbolicLinkNameLength == sizeof(dosdevicesW) + 2 * sizeof(WCHAR) &&
1012                 !wcsnicmp( linkname, dosdevicesW, ARRAY_SIZE( dosdevicesW )))
1013             {
1014                 len += 4;
1015                 if (volumepathname && len < buflen)
1016                 {
1017                     path[0] = linkname[ARRAY_SIZE( dosdevicesW )];
1018                     path[1] = ':';
1019                     path[2] = '\\';
1020                     path[3] = 0;
1021                     path += 4;
1022                 }
1023             }
1024         }
1025         HeapFree( GetProcessHeap(), 0, link );
1026     }
1027     if (buflen <= len) SetLastError( ERROR_MORE_DATA );
1028     else if (volumepathname)
1029     {
1030         volumepathname[len] = 0;
1031         ret = TRUE;
1032     }
1033     if (returnlen) *returnlen = len + 1;
1034
1035 done:
1036     HeapFree( GetProcessHeap(), 0, target );
1037     CloseHandle( mgr );
1038     return ret;
1039 }
1040
1041
1042 /***********************************************************************
1043  *           FindFirstVolumeW   (kernelbase.@)
1044  */
1045 HANDLE WINAPI DECLSPEC_HOTPATCH FindFirstVolumeW( LPWSTR volume, DWORD len )
1046 {
1047     DWORD size = 1024;
1048     DWORD br;
1049     HANDLE mgr = CreateFileW( MOUNTMGR_DOS_DEVICE_NAME, 0, FILE_SHARE_READ|FILE_SHARE_WRITE,
1050                               NULL, OPEN_EXISTING, 0, 0 );
1051     if (mgr == INVALID_HANDLE_VALUE) return INVALID_HANDLE_VALUE;
1052
1053     for (;;)
1054     {
1055         MOUNTMGR_MOUNT_POINT input;
1056         MOUNTMGR_MOUNT_POINTS *output;
1057
1058         if (!(output = HeapAlloc( GetProcessHeap(), 0, size )))
1059         {
1060             SetLastError( ERROR_NOT_ENOUGH_MEMORY );
1061             break;
1062         }
1063         memset( &input, 0, sizeof(input) );
1064
1065         if (!DeviceIoControl( mgr, IOCTL_MOUNTMGR_QUERY_POINTS, &input, sizeof(input),
1066                               output, size, &br, NULL ))
1067         {
1068             if (GetLastError() != ERROR_MORE_DATA) break;
1069             size = output->Size;
1070             HeapFree( GetProcessHeap(), 0, output );
1071             continue;
1072         }
1073         CloseHandle( mgr );
1074         /* abuse the Size field to store the current index */
1075         output->Size = 0;
1076         if (!FindNextVolumeW( output, volume, len ))
1077         {
1078             HeapFree( GetProcessHeap(), 0, output );
1079             return INVALID_HANDLE_VALUE;
1080         }
1081         return output;
1082     }
1083     CloseHandle( mgr );
1084     return INVALID_HANDLE_VALUE;
1085 }
1086
1087
1088 /***********************************************************************
1089  *           FindNextVolumeW   (kernelbase.@)
1090  */
1091 BOOL WINAPI DECLSPEC_HOTPATCH FindNextVolumeW( HANDLE handle, LPWSTR volume, DWORD len )
1092 {
1093     MOUNTMGR_MOUNT_POINTS *data = handle;
1094
1095     while (data->Size < data->NumberOfMountPoints)
1096     {
1097         static const WCHAR volumeW[] = {'\\','?','?','\\','V','o','l','u','m','e','{',};
1098         WCHAR *link = (WCHAR *)((char *)data + data->MountPoints[data->Size].SymbolicLinkNameOffset);
1099         DWORD size = data->MountPoints[data->Size].SymbolicLinkNameLength;
1100         data->Size++;
1101         /* skip non-volumes */
1102         if (size < sizeof(volumeW) || memcmp( link, volumeW, sizeof(volumeW) )) continue;
1103         if (size + sizeof(WCHAR) >= len * sizeof(WCHAR))
1104         {
1105             SetLastError( ERROR_FILENAME_EXCED_RANGE );
1106             return FALSE;
1107         }
1108         memcpy( volume, link, size );
1109         volume[1] = '\\';  /* map \??\ to \\?\ */
1110         volume[size / sizeof(WCHAR)] = '\\';  /* Windows appends a backslash */
1111         volume[size / sizeof(WCHAR) + 1] = 0;
1112         TRACE( "returning entry %lu %s\n", data->Size - 1, debugstr_w(volume) );
1113         return TRUE;
1114     }
1115     SetLastError( ERROR_NO_MORE_FILES );
1116     return FALSE;
1117 }
1118
1119
1120 /***********************************************************************
1121  *           FindVolumeClose   (kernelbase.@)
1122  */
1123 BOOL WINAPI DECLSPEC_HOTPATCH FindVolumeClose( HANDLE handle )
1124 {
1125     return HeapFree( GetProcessHeap(), 0, handle );
1126 }
1127
1128
1129 /***********************************************************************
1130  *           DeleteVolumeMountPointW (kernelbase.@)
1131  */
1132 BOOL WINAPI /* DECLSPEC_HOTPATCH */ DeleteVolumeMountPointW( LPCWSTR mountpoint )
1133 {
1134     FIXME("(%s), stub!\n", debugstr_w(mountpoint));
1135     return FALSE;
1136 }
1137
1138
1139 /***********************************************************************
1140  *           GetVolumeInformationByHandleW (kernelbase.@)
1141  */
1142 BOOL WINAPI GetVolumeInformationByHandleW( HANDLE handle, WCHAR *label, DWORD label_len,
1143                                            DWORD *serial, DWORD *filename_len, DWORD *flags,
1144                                            WCHAR *fsname, DWORD fsname_len )
1145 {
1146     IO_STATUS_BLOCK io;
1147
1148     TRACE( "%p\n", handle );
1149
1150     if (label || serial)
1151     {
1152         char buffer[sizeof(FILE_FS_VOLUME_INFORMATION) + MAX_PATH * sizeof(WCHAR)];
1153         FILE_FS_VOLUME_INFORMATION *info = (FILE_FS_VOLUME_INFORMATION *)buffer;
1154
1155         if (!set_ntstatus( NtQueryVolumeInformationFile( handle, &io, info, sizeof(buffer),
1156                                                          FileFsVolumeInformation ) ))
1157             return FALSE;
1158
1159         if (label)
1160         {
1161             if (label_len < info->VolumeLabelLength / sizeof(WCHAR) + 1)
1162             {
1163                 SetLastError( ERROR_BAD_LENGTH );
1164                 return FALSE;
1165             }
1166             memcpy( label, info->VolumeLabel, info->VolumeLabelLength );
1167             label[info->VolumeLabelLength / sizeof(WCHAR)] = 0;
1168         }
1169         if (serial) *serial = info->VolumeSerialNumber;
1170     }
1171
1172     if (filename_len || flags || fsname)
1173     {
1174         char buffer[sizeof(FILE_FS_ATTRIBUTE_INFORMATION) + MAX_PATH * sizeof(WCHAR)];
1175         FILE_FS_ATTRIBUTE_INFORMATION *info = (FILE_FS_ATTRIBUTE_INFORMATION *)buffer;
1176
1177         if (!set_ntstatus( NtQueryVolumeInformationFile( handle, &io, info, sizeof(buffer),
1178                                                          FileFsAttributeInformation ) ))
1179             return FALSE;
1180
1181         if (fsname)
1182         {
1183             if (fsname_len < info->FileSystemNameLength / sizeof(WCHAR) + 1)
1184             {
1185                 SetLastError( ERROR_BAD_LENGTH );
1186                 return FALSE;
1187             }
1188             memcpy( fsname, info->FileSystemName, info->FileSystemNameLength );
1189             fsname[info->FileSystemNameLength / sizeof(WCHAR)] = 0;
1190         }
1191         if (filename_len) *filename_len = info->MaximumComponentNameLength;
1192         if (flags) *flags = info->FileSystemAttributes;
1193     }
1194
1195     return TRUE;
1196 }