Author: hpoussin Date: Sun Sep 6 22:02:22 2009 New Revision: 43007
URL: http://svn.reactos.org/svn/reactos?rev=43007&view=rev Log: Rework FAT filesystem to not be tied to boot filesystem
Modified: trunk/reactos/boot/freeldr/freeldr/fs/fat.c trunk/reactos/boot/freeldr/freeldr/include/fs/fat.h
Modified: trunk/reactos/boot/freeldr/freeldr/fs/fat.c URL: http://svn.reactos.org/svn/reactos/trunk/reactos/boot/freeldr/freeldr/fs/fat... ============================================================================== --- trunk/reactos/boot/freeldr/freeldr/fs/fat.c [iso-8859-1] (original) +++ trunk/reactos/boot/freeldr/freeldr/fs/fat.c [iso-8859-1] Sun Sep 6 22:02:22 2009 @@ -23,33 +23,34 @@ #include <debug.h>
ULONG FatDetermineFatType(PFAT_BOOTSECTOR FatBootSector, ULONG PartitionSectorCount); -PVOID FatBufferDirectory(ULONG DirectoryStartCluster, ULONG* EntryCountPointer, BOOLEAN RootDirectory); -BOOLEAN FatSearchDirectoryBufferForFile(PVOID DirectoryBuffer, ULONG EntryCount, PCHAR FileName, PFAT_FILE_INFO FatFileInfoPointer); -LONG FatLookupFile(PCSTR FileName, ULONG DeviceId, PFAT_FILE_INFO FatFileInfoPointer); +PVOID FatBufferDirectory(PFAT_VOLUME_INFO Volume, ULONG DirectoryStartCluster, ULONG* EntryCountPointer, BOOLEAN RootDirectory); +BOOLEAN FatSearchDirectoryBufferForFile(PFAT_VOLUME_INFO Volume, PVOID DirectoryBuffer, ULONG EntryCount, PCHAR FileName, PFAT_FILE_INFO FatFileInfoPointer); +LONG FatLookupFile(PFAT_VOLUME_INFO Volume, PCSTR FileName, ULONG DeviceId, PFAT_FILE_INFO FatFileInfoPointer); void FatParseShortFileName(PCHAR Buffer, PDIRENTRY DirEntry); -BOOLEAN FatGetFatEntry(ULONG Cluster, ULONG* ClusterPointer); -ULONG FatCountClustersInChain(ULONG StartCluster); -ULONG* FatGetClusterChainArray(ULONG StartCluster); -BOOLEAN FatReadCluster(ULONG ClusterNumber, PVOID Buffer); -BOOLEAN FatReadClusterChain(ULONG StartClusterNumber, ULONG NumberOfClusters, PVOID Buffer); -BOOLEAN FatReadPartialCluster(ULONG ClusterNumber, ULONG StartingOffset, ULONG Length, PVOID Buffer); -BOOLEAN FatReadFile(PFAT_FILE_INFO FatFileInfo, ULONG BytesToRead, ULONG* BytesRead, PVOID Buffer); -BOOLEAN FatReadVolumeSectors(ULONG DriveNumber, ULONG SectorNumber, ULONG SectorCount, PVOID Buffer); - -ULONG BytesPerSector; /* Number of bytes per sector */ -ULONG SectorsPerCluster; /* Number of sectors per cluster */ -ULONG FatVolumeStartSector; /* Absolute starting sector of the partition */ -ULONG FatSectorStart; /* Starting sector of 1st FAT table */ -ULONG ActiveFatSectorStart; /* Starting sector of active FAT table */ -ULONG NumberOfFats; /* Number of FAT tables */ -ULONG SectorsPerFat; /* Sectors per FAT table */ -ULONG RootDirSectorStart; /* Starting sector of the root directory (non-fat32) */ -ULONG RootDirSectors; /* Number of sectors of the root directory (non-fat32) */ -ULONG RootDirStartCluster; /* Starting cluster number of the root directory (fat32 only) */ -ULONG DataSectorStart; /* Starting sector of the data area */ - -ULONG FatType = 0; /* FAT12, FAT16, FAT32, FATX16 or FATX32 */ -ULONG FatDriveNumber = 0; +BOOLEAN FatGetFatEntry(PFAT_VOLUME_INFO Volume, ULONG Cluster, ULONG* ClusterPointer); +ULONG FatCountClustersInChain(PFAT_VOLUME_INFO Volume, ULONG StartCluster); +ULONG* FatGetClusterChainArray(PFAT_VOLUME_INFO Volume, ULONG StartCluster); +BOOLEAN FatReadClusterChain(PFAT_VOLUME_INFO Volume, ULONG StartClusterNumber, ULONG NumberOfClusters, PVOID Buffer); +BOOLEAN FatReadPartialCluster(PFAT_VOLUME_INFO Volume, ULONG ClusterNumber, ULONG StartingOffset, ULONG Length, PVOID Buffer); +BOOLEAN FatReadVolumeSectors(PFAT_VOLUME_INFO Volume, ULONG SectorNumber, ULONG SectorCount, PVOID Buffer); + +typedef struct _FAT_VOLUME_INFO +{ + ULONG BytesPerSector; /* Number of bytes per sector */ + ULONG SectorsPerCluster; /* Number of sectors per cluster */ + ULONG FatSectorStart; /* Starting sector of 1st FAT table */ + ULONG ActiveFatSectorStart; /* Starting sector of active FAT table */ + ULONG NumberOfFats; /* Number of FAT tables */ + ULONG SectorsPerFat; /* Sectors per FAT table */ + ULONG RootDirSectorStart; /* Starting sector of the root directory (non-fat32) */ + ULONG RootDirSectors; /* Number of sectors of the root directory (non-fat32) */ + ULONG RootDirStartCluster; /* Starting cluster number of the root directory (fat32 only) */ + ULONG DataSectorStart; /* Starting sector of the data area */ + ULONG FatType; /* FAT12, FAT16, FAT32, FATX16 or FATX32 */ + ULONG DeviceId; +} FAT_VOLUME_INFO; + +static PFAT_VOLUME_INFO FatVolume = NULL;
VOID FatSwapFatBootSector(PFAT_BOOTSECTOR Obj) { @@ -129,7 +130,7 @@ SW(Obj, LastAccessDate); }
-BOOLEAN FatOpenVolume(UCHAR DriveNumber, ULONGLONG VolumeStartSector, ULONGLONG PartitionSectorCount) +BOOLEAN FatOpenVolume(PFAT_VOLUME_INFO Volume, PFAT_BOOTSECTOR BootSector, ULONGLONG PartitionSectorCount) { char ErrMsg[80]; ULONG FatSize; @@ -137,42 +138,21 @@ PFAT32_BOOTSECTOR Fat32VolumeBootSector; PFATX_BOOTSECTOR FatXVolumeBootSector;
- DPRINTM(DPRINT_FILESYSTEM, "FatOpenVolume() DriveNumber = 0x%x VolumeStartSector = %d\n", DriveNumber, VolumeStartSector); - - // Store the drive number - FatDriveNumber = DriveNumber; + DPRINTM(DPRINT_FILESYSTEM, "FatOpenVolume() DeviceId = %d\n", Volume->DeviceId);
// // Allocate the memory to hold the boot sector // - FatVolumeBootSector = (PFAT_BOOTSECTOR) MmHeapAlloc(512); - Fat32VolumeBootSector = (PFAT32_BOOTSECTOR) FatVolumeBootSector; - FatXVolumeBootSector = (PFATX_BOOTSECTOR) FatVolumeBootSector; - - // - // Make sure we got the memory - // - if (FatVolumeBootSector == NULL) - { - FileSystemError("Out of memory."); - return FALSE; - } - - // Now try to read the boot sector - // If this fails then abort - if (!MachDiskReadLogicalSectors(DriveNumber, VolumeStartSector, 1, (PVOID)DISKREADBUFFER)) - { - MmHeapFree(FatVolumeBootSector); - return FALSE; - } - RtlCopyMemory(FatVolumeBootSector, (PVOID)DISKREADBUFFER, 512); + FatVolumeBootSector = (PFAT_BOOTSECTOR)BootSector; + Fat32VolumeBootSector = (PFAT32_BOOTSECTOR)BootSector; + FatXVolumeBootSector = (PFATX_BOOTSECTOR)BootSector;
// Get the FAT type - FatType = FatDetermineFatType(FatVolumeBootSector, PartitionSectorCount); + Volume->FatType = FatDetermineFatType(FatVolumeBootSector, PartitionSectorCount);
// Dump boot sector (and swap it for big endian systems) DPRINTM(DPRINT_FILESYSTEM, "Dumping boot sector:\n"); - if (ISFATX(FatType)) + if (ISFATX(Volume->FatType)) { FatSwapFatXBootSector(FatXVolumeBootSector); DPRINTM(DPRINT_FILESYSTEM, "sizeof(FATX_BOOTSECTOR) = 0x%x.\n", sizeof(FATX_BOOTSECTOR)); @@ -183,10 +163,10 @@ DPRINTM(DPRINT_FILESYSTEM, "NumberOfFats: %d\n", FatXVolumeBootSector->NumberOfFats); DPRINTM(DPRINT_FILESYSTEM, "Unknown: 0x%x\n", FatXVolumeBootSector->Unknown);
- DPRINTM(DPRINT_FILESYSTEM, "FatType %s\n", FatType == FATX16 ? "FATX16" : "FATX32"); - - } - else if (FatType == FAT32) + DPRINTM(DPRINT_FILESYSTEM, "FatType %s\n", Volume->FatType == FATX16 ? "FATX16" : "FATX32"); + + } + else if (Volume->FatType == FAT32) { FatSwapFat32BootSector(Fat32VolumeBootSector); DPRINTM(DPRINT_FILESYSTEM, "sizeof(FAT32_BOOTSECTOR) = 0x%x.\n", sizeof(FAT32_BOOTSECTOR)); @@ -249,19 +229,13 @@ }
// - // Set the correct partition offset - // - FatVolumeStartSector = VolumeStartSector; - - // // Check the boot sector magic // - if (! ISFATX(FatType) && FatVolumeBootSector->BootSectorMagic != 0xaa55) - { - sprintf(ErrMsg, "Invalid boot sector magic on drive 0x%x (expected 0xaa55 found 0x%x)", - DriveNumber, FatVolumeBootSector->BootSectorMagic); + if (! ISFATX(Volume->FatType) && FatVolumeBootSector->BootSectorMagic != 0xaa55) + { + sprintf(ErrMsg, "Invalid boot sector magic (expected 0xaa55 found 0x%x)", + FatVolumeBootSector->BootSectorMagic); FileSystemError(ErrMsg); - MmHeapFree(FatVolumeBootSector); return FALSE; }
@@ -269,72 +243,60 @@ // Check the FAT cluster size // We do not support clusters bigger than 64k // - if ((ISFATX(FatType) && 64 * 1024 < FatXVolumeBootSector->SectorsPerCluster * 512) || - (! ISFATX(FatType) && 64 * 1024 < FatVolumeBootSector->SectorsPerCluster * FatVolumeBootSector->BytesPerSector)) + if ((ISFATX(Volume->FatType) && 64 * 1024 < FatXVolumeBootSector->SectorsPerCluster * 512) || + (! ISFATX(Volume->FatType) && 64 * 1024 < FatVolumeBootSector->SectorsPerCluster * FatVolumeBootSector->BytesPerSector)) { FileSystemError("This file system has cluster sizes bigger than 64k.\nFreeLoader does not support this."); - MmHeapFree(FatVolumeBootSector); return FALSE; } - - // - // Clear our variables - // - FatSectorStart = 0; - ActiveFatSectorStart = 0; - NumberOfFats = 0; - RootDirSectorStart = 0; - DataSectorStart = 0; - SectorsPerFat = 0; - RootDirSectors = 0;
// // Get the sectors per FAT, // root directory starting sector, // and data sector start // - if (ISFATX(FatType)) - { - BytesPerSector = 512; - SectorsPerCluster = SWAPD(FatXVolumeBootSector->SectorsPerCluster); - FatSectorStart = (4096 / BytesPerSector); - ActiveFatSectorStart = FatSectorStart; - NumberOfFats = 1; - FatSize = PartitionSectorCount / SectorsPerCluster * - (FATX16 == FatType ? 2 : 4); - SectorsPerFat = (((FatSize + 4095) / 4096) * 4096) / BytesPerSector; - - RootDirSectorStart = FatSectorStart + NumberOfFats * SectorsPerFat; - RootDirSectors = FatXVolumeBootSector->SectorsPerCluster; - - DataSectorStart = RootDirSectorStart + RootDirSectors; - } - else if (FatType != FAT32) - { - BytesPerSector = FatVolumeBootSector->BytesPerSector; - SectorsPerCluster = FatVolumeBootSector->SectorsPerCluster; - FatSectorStart = FatVolumeBootSector->ReservedSectors; - ActiveFatSectorStart = FatSectorStart; - NumberOfFats = FatVolumeBootSector->NumberOfFats; - SectorsPerFat = FatVolumeBootSector->SectorsPerFat; - - RootDirSectorStart = FatSectorStart + NumberOfFats * SectorsPerFat; - RootDirSectors = ((FatVolumeBootSector->RootDirEntries * 32) + (BytesPerSector - 1)) / BytesPerSector; - - DataSectorStart = RootDirSectorStart + RootDirSectors; + if (ISFATX(Volume->FatType)) + { + Volume->BytesPerSector = 512; + Volume->SectorsPerCluster = SWAPD(FatXVolumeBootSector->SectorsPerCluster); + Volume->FatSectorStart = (4096 / Volume->BytesPerSector); + Volume->ActiveFatSectorStart = Volume->FatSectorStart; + Volume->NumberOfFats = 1; + FatSize = PartitionSectorCount / Volume->SectorsPerCluster * + (Volume->FatType == FATX16 ? 2 : 4); + Volume->SectorsPerFat = (((FatSize + 4095) / 4096) * 4096) / Volume->BytesPerSector; + + Volume->RootDirSectorStart = Volume->FatSectorStart + Volume->NumberOfFats * Volume->SectorsPerFat; + Volume->RootDirSectors = FatXVolumeBootSector->SectorsPerCluster; + + Volume->DataSectorStart = Volume->RootDirSectorStart + Volume->RootDirSectors; + } + else if (Volume->FatType != FAT32) + { + Volume->BytesPerSector = FatVolumeBootSector->BytesPerSector; + Volume->SectorsPerCluster = FatVolumeBootSector->SectorsPerCluster; + Volume->FatSectorStart = FatVolumeBootSector->ReservedSectors; + Volume->ActiveFatSectorStart = Volume->FatSectorStart; + Volume->NumberOfFats = FatVolumeBootSector->NumberOfFats; + Volume->SectorsPerFat = FatVolumeBootSector->SectorsPerFat; + + Volume->RootDirSectorStart = Volume->FatSectorStart + Volume->NumberOfFats * Volume->SectorsPerFat; + Volume->RootDirSectors = ((FatVolumeBootSector->RootDirEntries * 32) + (Volume->BytesPerSector - 1)) / Volume->BytesPerSector; + + Volume->DataSectorStart = Volume->RootDirSectorStart + Volume->RootDirSectors; } else { - BytesPerSector = Fat32VolumeBootSector->BytesPerSector; - SectorsPerCluster = Fat32VolumeBootSector->SectorsPerCluster; - FatSectorStart = Fat32VolumeBootSector->ReservedSectors; - ActiveFatSectorStart = FatSectorStart + - ((Fat32VolumeBootSector->ExtendedFlags & 0x80) ? ((Fat32VolumeBootSector->ExtendedFlags & 0x0f) * Fat32VolumeBootSector->SectorsPerFatBig) : 0); - NumberOfFats = Fat32VolumeBootSector->NumberOfFats; - SectorsPerFat = Fat32VolumeBootSector->SectorsPerFatBig; - - RootDirStartCluster = Fat32VolumeBootSector->RootDirStartCluster; - DataSectorStart = FatSectorStart + NumberOfFats * SectorsPerFat; + Volume->BytesPerSector = Fat32VolumeBootSector->BytesPerSector; + Volume->SectorsPerCluster = Fat32VolumeBootSector->SectorsPerCluster; + Volume->FatSectorStart = Fat32VolumeBootSector->ReservedSectors; + Volume->ActiveFatSectorStart = Volume->FatSectorStart + + ((Fat32VolumeBootSector->ExtendedFlags & 0x80) ? ((Fat32VolumeBootSector->ExtendedFlags & 0x0f) * Fat32VolumeBootSector->SectorsPerFatBig) : 0); + Volume->NumberOfFats = Fat32VolumeBootSector->NumberOfFats; + Volume->SectorsPerFat = Fat32VolumeBootSector->SectorsPerFatBig; + + Volume->RootDirStartCluster = Fat32VolumeBootSector->RootDirStartCluster; + Volume->DataSectorStart = Volume->FatSectorStart + Volume->NumberOfFats * Volume->SectorsPerFat;
// // Check version @@ -345,20 +307,6 @@ FileSystemError("FreeLoader is too old to work with this FAT32 filesystem.\nPlease update FreeLoader."); return FALSE; } - } - MmHeapFree(FatVolumeBootSector); - - { - GEOMETRY DriveGeometry; - ULONG BlockSize; - - // Initialize drive by getting its geometry - if (!MachDiskGetDriveGeometry(DriveNumber, &DriveGeometry)) - { - return FALSE; - } - - BlockSize = MachDiskGetCacheableBlockCount(DriveNumber); }
return TRUE; @@ -419,7 +367,7 @@ } }
-PVOID FatBufferDirectory(ULONG DirectoryStartCluster, ULONG *DirectorySize, BOOLEAN RootDirectory) +PVOID FatBufferDirectory(PFAT_VOLUME_INFO Volume, ULONG DirectoryStartCluster, ULONG *DirectorySize, BOOLEAN RootDirectory) { PVOID DirectoryBuffer;
@@ -429,9 +377,9 @@ * For FAT32, the root directory is nothing special. We can treat it the same * as a subdirectory. */ - if (RootDirectory && FAT32 == FatType) - { - DirectoryStartCluster = RootDirStartCluster; + if (RootDirectory && Volume->FatType == FAT32) + { + DirectoryStartCluster = Volume->RootDirStartCluster; RootDirectory = FALSE; }
@@ -440,11 +388,11 @@ // if (RootDirectory) { - *DirectorySize = RootDirSectors * BytesPerSector; + *DirectorySize = Volume->RootDirSectors * Volume->BytesPerSector; } else { - *DirectorySize = FatCountClustersInChain(DirectoryStartCluster) * SectorsPerCluster * BytesPerSector; + *DirectorySize = FatCountClustersInChain(Volume, DirectoryStartCluster) * Volume->SectorsPerCluster * Volume->BytesPerSector; }
// @@ -463,7 +411,7 @@ // if (RootDirectory) { - if (!FatReadVolumeSectors(FatDriveNumber, RootDirSectorStart, RootDirSectors, DirectoryBuffer)) + if (!FatReadVolumeSectors(Volume, Volume->RootDirSectorStart, Volume->RootDirSectors, DirectoryBuffer)) { MmHeapFree(DirectoryBuffer); return NULL; @@ -471,7 +419,7 @@ } else { - if (!FatReadClusterChain(DirectoryStartCluster, 0xFFFFFFFF, DirectoryBuffer)) + if (!FatReadClusterChain(Volume, DirectoryStartCluster, 0xFFFFFFFF, DirectoryBuffer)) { MmHeapFree(DirectoryBuffer); return NULL; @@ -481,7 +429,7 @@ return DirectoryBuffer; }
-BOOLEAN FatSearchDirectoryBufferForFile(PVOID DirectoryBuffer, ULONG DirectorySize, PCHAR FileName, PFAT_FILE_INFO FatFileInfoPointer) +BOOLEAN FatSearchDirectoryBufferForFile(PFAT_VOLUME_INFO Volume, PVOID DirectoryBuffer, ULONG DirectorySize, PCHAR FileName, PFAT_FILE_INFO FatFileInfoPointer) { ULONG EntryCount; ULONG CurrentEntry; @@ -672,7 +620,7 @@ // StartCluster = ((ULONG)DirEntry->ClusterHigh << 16) + DirEntry->ClusterLow; DPRINTM(DPRINT_FILESYSTEM, "StartCluster = 0x%x\n", StartCluster); - FatFileInfoPointer->FileFatChain = FatGetClusterChainArray(StartCluster); + FatFileInfoPointer->FileFatChain = FatGetClusterChainArray(Volume, StartCluster);
// // See if memory allocation failed @@ -696,7 +644,7 @@ return FALSE; }
-static BOOLEAN FatXSearchDirectoryBufferForFile(PVOID DirectoryBuffer, ULONG DirectorySize, PCHAR FileName, PFAT_FILE_INFO FatFileInfoPointer) +static BOOLEAN FatXSearchDirectoryBufferForFile(PFAT_VOLUME_INFO Volume, PVOID DirectoryBuffer, ULONG DirectorySize, PCHAR FileName, PFAT_FILE_INFO FatFileInfoPointer) { ULONG EntryCount; ULONG CurrentEntry; @@ -746,7 +694,7 @@ /* * Get the cluster chain */ - FatFileInfoPointer->FileFatChain = FatGetClusterChainArray(DirEntry->StartCluster); + FatFileInfoPointer->FileFatChain = FatGetClusterChainArray(Volume, DirEntry->StartCluster);
/* * See if memory allocation failed @@ -769,7 +717,7 @@ * specified filename and fills in an FAT_FILE_INFO structure * with info describing the file, etc. returns ARC error code */ -LONG FatLookupFile(PCSTR FileName, ULONG DeviceId, PFAT_FILE_INFO FatFileInfoPointer) +LONG FatLookupFile(PFAT_VOLUME_INFO Volume, PCSTR FileName, ULONG DeviceId, PFAT_FILE_INFO FatFileInfoPointer) { UINT32 i; ULONG NumberOfPathParts; @@ -809,7 +757,7 @@ // // Buffer the directory contents // - DirectoryBuffer = FatBufferDirectory(DirectoryStartCluster, &DirectorySize, (i == 0) ); + DirectoryBuffer = FatBufferDirectory(Volume, DirectoryStartCluster, &DirectorySize, (i == 0) ); if (DirectoryBuffer == NULL) { return ENOMEM; @@ -818,9 +766,9 @@ // // Search for file name in directory // - if (ISFATX(FatType)) - { - if (!FatXSearchDirectoryBufferForFile(DirectoryBuffer, DirectorySize, PathPart, &FatFileInfo)) + if (ISFATX(Volume->FatType)) + { + if (!FatXSearchDirectoryBufferForFile(Volume, DirectoryBuffer, DirectorySize, PathPart, &FatFileInfo)) { MmHeapFree(DirectoryBuffer); return ENOENT; @@ -828,7 +776,7 @@ } else { - if (!FatSearchDirectoryBufferForFile(DirectoryBuffer, DirectorySize, PathPart, &FatFileInfo)) + if (!FatSearchDirectoryBufferForFile(Volume, DirectoryBuffer, DirectorySize, PathPart, &FatFileInfo)) { MmHeapFree(DirectoryBuffer); return ENOENT; @@ -906,7 +854,7 @@ * FatGetFatEntry() * returns the Fat entry for a given cluster number */ -BOOLEAN FatGetFatEntry(ULONG Cluster, ULONG* ClusterPointer) +BOOLEAN FatGetFatEntry(PFAT_VOLUME_INFO Volume, ULONG Cluster, ULONG* ClusterPointer) { ULONG fat = 0; UINT32 FatOffset; @@ -915,28 +863,28 @@
DPRINTM(DPRINT_FILESYSTEM, "FatGetFatEntry() Retrieving FAT entry for cluster %d.\n", Cluster);
- switch(FatType) + switch(Volume->FatType) { case FAT12:
FatOffset = Cluster + (Cluster / 2); - ThisFatSecNum = ActiveFatSectorStart + (FatOffset / BytesPerSector); - ThisFatEntOffset = (FatOffset % BytesPerSector); + ThisFatSecNum = Volume->ActiveFatSectorStart + (FatOffset / Volume->BytesPerSector); + ThisFatEntOffset = (FatOffset % Volume->BytesPerSector);
DPRINTM(DPRINT_FILESYSTEM, "FatOffset: %d\n", FatOffset); DPRINTM(DPRINT_FILESYSTEM, "ThisFatSecNum: %d\n", ThisFatSecNum); DPRINTM(DPRINT_FILESYSTEM, "ThisFatEntOffset: %d\n", ThisFatEntOffset);
- if (ThisFatEntOffset == (BytesPerSector - 1)) - { - if (!FatReadVolumeSectors(FatDriveNumber, ThisFatSecNum, 2, (PVOID)FILESYSBUFFER)) + if (ThisFatEntOffset == (Volume->BytesPerSector - 1)) + { + if (!FatReadVolumeSectors(Volume, ThisFatSecNum, 2, (PVOID)FILESYSBUFFER)) { return FALSE; } } else { - if (!FatReadVolumeSectors(FatDriveNumber, ThisFatSecNum, 1, (PVOID)FILESYSBUFFER)) + if (!FatReadVolumeSectors(Volume, ThisFatSecNum, 1, (PVOID)FILESYSBUFFER)) { return FALSE; } @@ -955,10 +903,10 @@ case FATX16:
FatOffset = (Cluster * 2); - ThisFatSecNum = ActiveFatSectorStart + (FatOffset / BytesPerSector); - ThisFatEntOffset = (FatOffset % BytesPerSector); - - if (!FatReadVolumeSectors(FatDriveNumber, ThisFatSecNum, 1, (PVOID)FILESYSBUFFER)) + ThisFatSecNum = Volume->ActiveFatSectorStart + (FatOffset / Volume->BytesPerSector); + ThisFatEntOffset = (FatOffset % Volume->BytesPerSector); + + if (!FatReadVolumeSectors(Volume, ThisFatSecNum, 1, (PVOID)FILESYSBUFFER)) { return FALSE; } @@ -972,10 +920,10 @@ case FATX32:
FatOffset = (Cluster * 4); - ThisFatSecNum = ActiveFatSectorStart + (FatOffset / BytesPerSector); - ThisFatEntOffset = (FatOffset % BytesPerSector); - - if (!FatReadVolumeSectors(FatDriveNumber, ThisFatSecNum, 1, (PVOID)FILESYSBUFFER)) + ThisFatSecNum = Volume->ActiveFatSectorStart + (FatOffset / Volume->BytesPerSector); + ThisFatEntOffset = (FatOffset % Volume->BytesPerSector); + + if (!FatReadVolumeSectors(Volume, ThisFatSecNum, 1, (PVOID)FILESYSBUFFER)) { return FALSE; } @@ -986,6 +934,10 @@
break;
+ default: + DPRINTM(DPRINT_FILESYSTEM, "Unknown FAT type %d\n", Volume->FatType); + return FALSE; + }
DPRINTM(DPRINT_FILESYSTEM, "FAT entry is 0x%x.\n", fat); @@ -995,7 +947,7 @@ return TRUE; }
-ULONG FatCountClustersInChain(ULONG StartCluster) +ULONG FatCountClustersInChain(PFAT_VOLUME_INFO Volume, ULONG StartCluster) { ULONG ClusterCount = 0;
@@ -1006,9 +958,9 @@ // // If end of chain then break out of our cluster counting loop // - if (((FatType == FAT12) && (StartCluster >= 0xff8)) || - ((FatType == FAT16 || FatType == FATX16) && (StartCluster >= 0xfff8)) || - ((FatType == FAT32 || FatType == FATX32) && (StartCluster >= 0x0ffffff8))) + if (((Volume->FatType == FAT12) && (StartCluster >= 0xff8)) || + ((Volume->FatType == FAT16 || Volume->FatType == FATX16) && (StartCluster >= 0xfff8)) || + ((Volume->FatType == FAT32 || Volume->FatType == FATX32) && (StartCluster >= 0x0ffffff8))) { break; } @@ -1021,7 +973,7 @@ // // Get next cluster // - if (!FatGetFatEntry(StartCluster, &StartCluster)) + if (!FatGetFatEntry(Volume, StartCluster, &StartCluster)) { return 0; } @@ -1032,7 +984,7 @@ return ClusterCount; }
-ULONG* FatGetClusterChainArray(ULONG StartCluster) +ULONG* FatGetClusterChainArray(PFAT_VOLUME_INFO Volume, ULONG StartCluster) { ULONG ClusterCount; ULONG ArraySize; @@ -1041,7 +993,7 @@
DPRINTM(DPRINT_FILESYSTEM, "FatGetClusterChainArray() StartCluster = %d\n", StartCluster);
- ClusterCount = FatCountClustersInChain(StartCluster) + 1; // Lets get the 0x0ffffff8 on the end of the array + ClusterCount = FatCountClustersInChain(Volume, StartCluster) + 1; // Lets get the 0x0ffffff8 on the end of the array ArraySize = ClusterCount * sizeof(ULONG);
// @@ -1067,9 +1019,9 @@ // // Don't try to get next cluster for last cluster // - if (((FatType == FAT12) && (StartCluster >= 0xff8)) || - ((FatType == FAT16 || FatType == FATX16) && (StartCluster >= 0xfff8)) || - ((FatType == FAT32 || FatType == FATX32) && (StartCluster >= 0x0ffffff8))) + if (((Volume->FatType == FAT12) && (StartCluster >= 0xff8)) || + ((Volume->FatType == FAT16 || Volume->FatType == FATX16) && (StartCluster >= 0xfff8)) || + ((Volume->FatType == FAT32 || Volume->FatType == FATX32) && (StartCluster >= 0x0ffffff8))) { Idx++; break; @@ -1078,7 +1030,7 @@ // // Get next cluster // - if (!FatGetFatEntry(StartCluster, &StartCluster)) + if (!FatGetFatEntry(Volume, StartCluster, &StartCluster)) { MmHeapFree(ArrayPointer); return NULL; @@ -1086,35 +1038,13 @@ }
return ArrayPointer; -} - -/* - * FatReadCluster() - * Reads the specified cluster into memory - */ -BOOLEAN FatReadCluster(ULONG ClusterNumber, PVOID Buffer) -{ - ULONG ClusterStartSector; - - ClusterStartSector = ((ClusterNumber - 2) * SectorsPerCluster) + DataSectorStart; - - DPRINTM(DPRINT_FILESYSTEM, "FatReadCluster() ClusterNumber = %d Buffer = 0x%x ClusterStartSector = %d\n", ClusterNumber, Buffer, ClusterStartSector); - - if (!FatReadVolumeSectors(FatDriveNumber, ClusterStartSector, SectorsPerCluster, (PVOID)FILESYSBUFFER)) - { - return FALSE; - } - - memcpy(Buffer, (PVOID)FILESYSBUFFER, SectorsPerCluster * BytesPerSector); - - return TRUE; }
/* * FatReadClusterChain() * Reads the specified clusters into memory */ -BOOLEAN FatReadClusterChain(ULONG StartClusterNumber, ULONG NumberOfClusters, PVOID Buffer) +BOOLEAN FatReadClusterChain(PFAT_VOLUME_INFO Volume, ULONG StartClusterNumber, ULONG NumberOfClusters, PVOID Buffer) { ULONG ClusterStartSector;
@@ -1127,17 +1057,17 @@ // // Calculate starting sector for cluster // - ClusterStartSector = ((StartClusterNumber - 2) * SectorsPerCluster) + DataSectorStart; + ClusterStartSector = ((StartClusterNumber - 2) * Volume->SectorsPerCluster) + Volume->DataSectorStart;
// // Read cluster into memory // - if (!FatReadVolumeSectors(FatDriveNumber, ClusterStartSector, SectorsPerCluster, (PVOID)FILESYSBUFFER)) + if (!FatReadVolumeSectors(Volume, ClusterStartSector, Volume->SectorsPerCluster, (PVOID)FILESYSBUFFER)) { return FALSE; }
- memcpy(Buffer, (PVOID)FILESYSBUFFER, SectorsPerCluster * BytesPerSector); + memcpy(Buffer, (PVOID)FILESYSBUFFER, Volume->SectorsPerCluster * Volume->BytesPerSector);
// // Decrement count of clusters left to read @@ -1147,12 +1077,12 @@ // // Increment buffer address by cluster size // - Buffer = (PVOID)((ULONG_PTR)Buffer + (SectorsPerCluster * BytesPerSector)); + Buffer = (PVOID)((ULONG_PTR)Buffer + (Volume->SectorsPerCluster * Volume->BytesPerSector));
// // Get next cluster // - if (!FatGetFatEntry(StartClusterNumber, &StartClusterNumber)) + if (!FatGetFatEntry(Volume, StartClusterNumber, &StartClusterNumber)) { return FALSE; } @@ -1160,9 +1090,9 @@ // // If end of chain then break out of our cluster reading loop // - if (((FatType == FAT12) && (StartClusterNumber >= 0xff8)) || - ((FatType == FAT16 || FatType == FATX16) && (StartClusterNumber >= 0xfff8)) || - ((FatType == FAT32 || FatType == FATX32) && (StartClusterNumber >= 0x0ffffff8))) + if (((Volume->FatType == FAT12) && (StartClusterNumber >= 0xff8)) || + ((Volume->FatType == FAT16 || Volume->FatType == FATX16) && (StartClusterNumber >= 0xfff8)) || + ((Volume->FatType == FAT32 || Volume->FatType == FATX32) && (StartClusterNumber >= 0x0ffffff8))) { break; } @@ -1175,15 +1105,15 @@ * FatReadPartialCluster() * Reads part of a cluster into memory */ -BOOLEAN FatReadPartialCluster(ULONG ClusterNumber, ULONG StartingOffset, ULONG Length, PVOID Buffer) +BOOLEAN FatReadPartialCluster(PFAT_VOLUME_INFO Volume, ULONG ClusterNumber, ULONG StartingOffset, ULONG Length, PVOID Buffer) { ULONG ClusterStartSector;
DPRINTM(DPRINT_FILESYSTEM, "FatReadPartialCluster() ClusterNumber = %d StartingOffset = %d Length = %d Buffer = 0x%x\n", ClusterNumber, StartingOffset, Length, Buffer);
- ClusterStartSector = ((ClusterNumber - 2) * SectorsPerCluster) + DataSectorStart; - - if (!FatReadVolumeSectors(FatDriveNumber, ClusterStartSector, SectorsPerCluster, (PVOID)FILESYSBUFFER)) + ClusterStartSector = ((ClusterNumber - 2) * Volume->SectorsPerCluster) + Volume->DataSectorStart; + + if (!FatReadVolumeSectors(Volume, ClusterStartSector, Volume->SectorsPerCluster, (PVOID)FILESYSBUFFER)) { return FALSE; } @@ -1200,6 +1130,7 @@ */ BOOLEAN FatReadFile(PFAT_FILE_INFO FatFileInfo, ULONG BytesToRead, ULONG* BytesRead, PVOID Buffer) { + PFAT_VOLUME_INFO Volume = FatFileInfo->Volume; ULONG ClusterNumber; ULONG OffsetInCluster; ULONG LengthInCluster; @@ -1260,7 +1191,7 @@ // the last cluster. //
- BytesPerCluster = SectorsPerCluster * BytesPerSector; + BytesPerCluster = Volume->SectorsPerCluster * Volume->BytesPerSector;
// // Only do the first read if we @@ -1279,7 +1210,7 @@ // // Now do the read and update BytesRead, BytesToRead, FilePointer, & Buffer // - if (!FatReadPartialCluster(ClusterNumber, OffsetInCluster, LengthInCluster, Buffer)) + if (!FatReadPartialCluster(Volume, ClusterNumber, OffsetInCluster, LengthInCluster, Buffer)) { return FALSE; } @@ -1310,7 +1241,7 @@ // // Now do the read and update BytesRead, BytesToRead, FilePointer, & Buffer // - if (!FatReadClusterChain(ClusterNumber, NumberOfClusters, Buffer)) + if (!FatReadClusterChain(Volume, ClusterNumber, NumberOfClusters, Buffer)) { return FALSE; } @@ -1335,7 +1266,7 @@ // // Now do the read and update BytesRead, BytesToRead, FilePointer, & Buffer // - if (!FatReadPartialCluster(ClusterNumber, 0, BytesToRead, Buffer)) + if (!FatReadPartialCluster(Volume, ClusterNumber, 0, BytesToRead, Buffer)) { return FALSE; } @@ -1351,16 +1282,35 @@ return TRUE; }
-BOOLEAN FatReadVolumeSectors(ULONG DriveNumber, ULONG SectorNumber, ULONG SectorCount, PVOID Buffer) -{ - // Now try to read in the block - if (!MachDiskReadLogicalSectors(DriveNumber, SectorNumber + FatVolumeStartSector, SectorCount, (PVOID)DISKREADBUFFER)) - { +BOOLEAN FatReadVolumeSectors(PFAT_VOLUME_INFO Volume, ULONG SectorNumber, ULONG SectorCount, PVOID Buffer) +{ + LARGE_INTEGER Position; + ULONG Count; + LONG ret; + + DPRINTM(DPRINT_FILESYSTEM, "FatReadVolumeSectors(): SectorNumber %d, SectorCount %d, Buffer %p\n", + SectorNumber, SectorCount, Buffer); + + // + // Seek to right position + // + Position.QuadPart = SectorNumber * 512; + ret = ArcSeek(Volume->DeviceId, &Position, SeekAbsolute); + if (ret != ESUCCESS) + { + DPRINTM(DPRINT_FILESYSTEM, "FatReadVolumeSectors() Failed to seek\n"); return FALSE; }
- // Copy data to the caller - RtlCopyMemory(Buffer, (PVOID)DISKREADBUFFER, SectorCount * BytesPerSector); + // + // Read data + // + ret = ArcRead(Volume->DeviceId, Buffer, SectorCount * 512, &Count); + if (ret != ESUCCESS || Count != SectorCount * 512) + { + DPRINTM(DPRINT_FILESYSTEM, "FatReadVolumeSectors() Failed to read\n"); + return FALSE; + }
// Return success return TRUE; @@ -1406,7 +1356,7 @@ DPRINTM(DPRINT_FILESYSTEM, "FatOpen() FileName = %s\n", Path);
RtlZeroMemory(&TempFileInfo, sizeof(TempFileInfo)); - ret = FatLookupFile(Path, DeviceId, &TempFileInfo); + ret = FatLookupFile(FatVolume, Path, DeviceId, &TempFileInfo); if (ret != ESUCCESS) return ENOENT;
@@ -1415,6 +1365,7 @@ return ENOMEM;
RtlCopyMemory(FileHandle, &TempFileInfo, sizeof(FAT_FILE_INFO)); + FileHandle->Volume = FatVolume;
FsSetDeviceSpecific(*FileId, FileHandle); return ESUCCESS; @@ -1467,13 +1418,24 @@
const DEVVTBL* FatMount(ULONG DeviceId) { + PFAT_VOLUME_INFO Volume; UCHAR Buffer[512]; PFAT_BOOTSECTOR BootSector = (PFAT_BOOTSECTOR)Buffer; PFAT32_BOOTSECTOR BootSector32 = (PFAT32_BOOTSECTOR)Buffer; PFATX_BOOTSECTOR BootSectorX = (PFATX_BOOTSECTOR)Buffer; + FILEINFORMATION FileInformation; LARGE_INTEGER Position; ULONG Count; + ULARGE_INTEGER SectorCount; LONG ret; + + // + // Allocate data for volume information + // + Volume = MmHeapAlloc(sizeof(FAT_VOLUME_INFO)); + if (!Volume) + return NULL; + RtlZeroMemory(Volume, sizeof(FAT_VOLUME_INFO));
// // Read the BootSector @@ -1482,31 +1444,68 @@ Position.LowPart = 0; ret = ArcSeek(DeviceId, &Position, SeekAbsolute); if (ret != ESUCCESS) + { + MmHeapFree(Volume); return NULL; + } ret = ArcRead(DeviceId, Buffer, sizeof(Buffer), &Count); if (ret != ESUCCESS || Count != sizeof(Buffer)) + { + MmHeapFree(Volume); return NULL; - - // - // Check if BootSector is valid. If yes, return FAT function table - // - if (RtlEqualMemory(BootSector->FileSystemType, "FAT12 ", 8) || - RtlEqualMemory(BootSector->FileSystemType, "FAT16 ", 8) || - RtlEqualMemory(BootSector32->FileSystemType, "FAT32 ", 8) || - RtlEqualMemory(BootSectorX->FileSystemType, "FATX", 4)) - { - // - // Compatibility hack as long as FS is not using underlying device DeviceId - // - ULONG DriveNumber; - ULONGLONG StartSector; - ULONGLONG SectorCount; - int Type; - if (!DiskGetBootVolume(&DriveNumber, &StartSector, &SectorCount, &Type)) - return NULL; - FatOpenVolume(DriveNumber, StartSector, SectorCount); - return &FatFuncTable; - } - else + } + + // + // Check if BootSector is valid. If no, return early + // + if (!RtlEqualMemory(BootSector->FileSystemType, "FAT12 ", 8) && + !RtlEqualMemory(BootSector->FileSystemType, "FAT16 ", 8) && + !RtlEqualMemory(BootSector32->FileSystemType, "FAT32 ", 8) && + !RtlEqualMemory(BootSectorX->FileSystemType, "FATX", 4)) + { + MmHeapFree(Volume); return NULL; -} + } + + // + // Determine sector count + // + ret = ArcGetFileInformation(DeviceId, &FileInformation); + if (ret != ESUCCESS) + { + MmHeapFree(Volume); + return NULL; + } + SectorCount.HighPart = FileInformation.EndingAddress.HighPart; + SectorCount.LowPart = FileInformation.EndingAddress.LowPart; + SectorCount.QuadPart /= SECTOR_SIZE; + + // + // Keep device id + // + Volume->DeviceId = DeviceId; + + // + // Really open the volume + // + if (!FatOpenVolume(Volume, BootSector, SectorCount.QuadPart)) + { + MmHeapFree(Volume); + return NULL; + } + + // + // HACK: for now, only support one FAT volume + // + if (FatVolume) + { + MmHeapFree(Volume); + return NULL; + } + FatVolume = Volume; + + // + // Return success + // + return &FatFuncTable; +}
Modified: trunk/reactos/boot/freeldr/freeldr/include/fs/fat.h URL: http://svn.reactos.org/svn/reactos/trunk/reactos/boot/freeldr/freeldr/includ... ============================================================================== --- trunk/reactos/boot/freeldr/freeldr/include/fs/fat.h [iso-8859-1] (original) +++ trunk/reactos/boot/freeldr/freeldr/include/fs/fat.h [iso-8859-1] Sun Sep 6 22:02:22 2009 @@ -144,12 +144,15 @@ } FATX_DIRENTRY, * PFATX_DIRENTRY; #include <poppack.h>
+typedef struct _FAT_VOLUME_INFO *PFAT_VOLUME_INFO; + typedef struct { ULONG FileSize; /* File size */ ULONG FilePointer; /* File pointer */ ULONG* FileFatChain; /* File fat chain array */ ULONG DriveNumber; + PFAT_VOLUME_INFO Volume; } FAT_FILE_INFO, * PFAT_FILE_INFO;
#define ATTR_NORMAL 0x00
-
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