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fat.c
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/***************************************************************************
*
* Copyright (c) 1997-2022 Jeff V. Merkey
* 7260 SE Tenino St.
* Portland, Oregon 97206
* jeffmerkey@gmail.com
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the Lesser GNU Public License as published by the
* Free Software Foundation, version 2.1, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* Original Authorship :
* source code written by Jeff V. Merkey
*
* Original Contributors :
* Jeff V. Merkey
*
*
*
****************************************************************************
*
*
* AUTHOR : Jeff V. Merkey (jeffmerkey@gmail.com)
* FILE : FAT.C
* DESCRIP : FAT Module
* DATE : November 16, 1998
*
*
***************************************************************************/
#include "globals.h"
void NWLockFat(VOLUME *volume)
{
#if (LINUX_SLEEP)
if (WaitOnSemaphore(&volume->FatSemaphore) == -EINTR)
NWFSPrint("lock fat was interrupted\n");
#endif
}
void NWUnlockFat(VOLUME *volume)
{
#if (LINUX_SLEEP)
SignalSemaphore(&volume->FatSemaphore);
#endif
}
MIRROR_LRU *RemoveFAT(VOLUME *volume, MIRROR_LRU *lru)
{
NWLockFat(volume);
if (volume->FATListHead == lru)
{
volume->FATListHead = (void *) lru->next;
if (volume->FATListHead)
volume->FATListHead->prior = NULL;
else
volume->FATListTail = NULL;
}
else
{
lru->prior->next = lru->next;
if (lru != volume->FATListTail)
lru->next->prior = lru->prior;
else
volume->FATListTail = lru->prior;
}
if (volume->FATListBlocks)
volume->FATListBlocks--;
NWUnlockFat(volume);
return lru;
}
void InsertFAT(VOLUME *volume, MIRROR_LRU *lru)
{
NWLockFat(volume);
if (!volume->FATListHead)
{
volume->FATListHead = lru;
volume->FATListTail = lru;
lru->next = lru->prior = 0;
}
else
{
volume->FATListTail->next = lru;
lru->next = 0;
lru->prior = volume->FATListTail;
volume->FATListTail = lru;
}
volume->FATListBlocks++;
NWUnlockFat(volume);
return;
}
void InsertFATTop(VOLUME *volume, MIRROR_LRU *lru)
{
NWLockFat(volume);
if (!volume->FATListHead)
{
volume->FATListHead = lru;
volume->FATListTail = lru;
lru->next = lru->prior = 0;
}
else
{
lru->next = volume->FATListHead;
lru->prior = 0;
volume->FATListHead->prior = lru;
volume->FATListHead = lru;
}
volume->FATListBlocks++;
NWUnlockFat(volume);
return;
}
ULONG InitializeFAT_LRU(VOLUME *volume)
{
volume->FATListHead = volume->FATListTail = 0;
volume->FATListBlocks = 0;
volume->FATBlockHash = NWFSCacheAlloc(BLOCK_NUMBER_HASH_SIZE, FATHASH_TAG);
if (!volume->FATBlockHash)
return -1;
volume->FATBlockHashLimit = NUMBER_OF_BLOCK_HASH_ENTRIES;
NWFSSet(volume->FATBlockHash, 0, BLOCK_NUMBER_HASH_SIZE);
return 0;
}
ULONG FreeFATLists(VOLUME *volume)
{
register MIRROR_LRU *lru;
while (volume->FATListHead)
{
lru = RemoveFAT(volume, (MIRROR_LRU *)volume->FATListHead);
if (lru)
{
NWFSFree(lru->CacheBuffer);
NWFSFree(lru);
}
}
if (volume->FATBlockHash)
NWFSFree(volume->FATBlockHash);
volume->FATBlockHashLimit =0;
volume->FATBlockHash = 0;
return 0;
}
#if (CACHE_FAT_TABLES)
ULONG FreeFAT_LRU(VOLUME *volume)
{
register MIRROR_LRU *lru;
while (volume->FATListHead)
{
lru = volume->FATListHead;
volume->FATListHead = volume->FATListHead->next;
if (!volume->FATListHead)
volume->FATListTail = 0;
if (lru->BlockState == L_DIRTY)
{
if (lru->Cluster1 != (ULONG) -1)
{
if (WritePhysicalVolumeCluster(volume,
lru->Cluster1,
lru->CacheBuffer,
lru->ClusterSize,
FAT_PRIORITY))
{
NWFSPrint("dirty fat LRU block #%u [%X] write failed\n",
(unsigned int)lru->Cluster1,
(unsigned int)lru->Cluster1);
}
}
if (lru->Cluster2 != (ULONG) -1)
{
if (WritePhysicalVolumeCluster(volume,
lru->Cluster2,
lru->CacheBuffer,
lru->ClusterSize,
FAT_PRIORITY))
{
NWFSPrint("dirty fat LRU mirror #%u [%X] write failed\n",
(unsigned int)lru->Cluster2, (unsigned int)lru->Cluster2);
}
}
lru->BlockState = L_DATAVALID;
}
NWFSFree(lru->CacheBuffer);
NWFSFree(lru);
}
if (volume->FATBlockHash)
NWFSFree(volume->FATBlockHash);
volume->FATBlockHashLimit =0;
volume->FATBlockHash = 0;
return 0;
}
MIRROR_LRU *AllocateFAT_LRUElement(VOLUME *volume)
{
register MIRROR_LRU *lru;
lru = NWFSAlloc(sizeof(MIRROR_LRU), FATLRU_TAG);
if (!lru)
return 0;
NWFSSet(lru, 0, sizeof(MIRROR_LRU));
lru->BlockState = L_FREE;
lru->Cluster1 = -1;
lru->Cluster2 = -1;
lru->ClusterSize = volume->ClusterSize;
lru->CacheBuffer = NWFSCacheAlloc(volume->ClusterSize, FAT_TAG);
if (!lru->CacheBuffer)
{
NWFSFree(lru);
return 0;
}
NWFSSet(lru->CacheBuffer, 0, volume->ClusterSize);
return lru;
}
void FreeFAT_LRUElement(MIRROR_LRU *lru)
{
if (lru->CacheBuffer)
NWFSFree(lru->CacheBuffer);
NWFSFree(lru);
return;
}
ULONG FlushFAT(VOLUME *volume)
{
register MIRROR_LRU *lru;
lru = volume->FATListHead;
while (lru)
{
if (lru->BlockState == L_DIRTY)
{
if (lru->Cluster1 != (ULONG) -1)
{
if (WritePhysicalVolumeCluster(volume,
lru->Cluster1,
lru->CacheBuffer,
lru->ClusterSize,
FAT_PRIORITY))
continue;
}
if (lru->Cluster2 != (ULONG) -1)
{
if (WritePhysicalVolumeCluster(volume,
lru->Cluster2,
lru->CacheBuffer,
lru->ClusterSize,
FAT_PRIORITY))
continue;
}
lru->BlockState = L_DATAVALID;
}
lru = lru->next;
}
return 0;
}
ULONG FlushFATBuffer(VOLUME *volume, MIRROR_LRU *lru, ULONG cluster)
{
register ULONG EntriesPerCluster;
register ULONG Offset, cbytes;
register FAT_ENTRY *Table;
ULONG retCode = 0;
EntriesPerCluster = volume->ClusterSize / sizeof(FAT_ENTRY);
Offset = cluster % EntriesPerCluster;
Table = (FAT_ENTRY *) lru->CacheBuffer;
if (lru->Cluster1 != (ULONG) -1)
{
cbytes = WriteClusterWithOffset(volume,
lru->Cluster1,
Offset * sizeof(FAT_ENTRY),
(BYTE *)&Table[Offset],
sizeof(FAT_ENTRY),
KERNEL_ADDRESS_SPACE,
&retCode,
FAT_PRIORITY);
if ((cbytes == sizeof(FAT_ENTRY)) && !retCode)
{
if (lru->Cluster2 != (ULONG) -1)
{
#if (!CREATE_FAT_MISMATCH)
cbytes = WriteClusterWithOffset(volume,
lru->Cluster2,
Offset * sizeof(FAT_ENTRY),
(BYTE *)&Table[Offset],
sizeof(FAT_ENTRY),
KERNEL_ADDRESS_SPACE,
&retCode,
FAT_PRIORITY);
if ((cbytes == sizeof(FAT_ENTRY)) && !retCode)
#endif
return 0;
}
}
}
return -1;
}
ULONG WriteFATEntry(VOLUME *volume, MIRROR_LRU *lru,
FAT_ENTRY *fat, ULONG Cluster)
{
register FAT_ENTRY *Table;
register ULONG EntriesPerCluster;
register ULONG Offset;
EntriesPerCluster = volume->ClusterSize / sizeof(FAT_ENTRY);
Offset = Cluster % EntriesPerCluster;
Table = (FAT_ENTRY *) lru->CacheBuffer;
if (fat)
{
NWFSCopy(&Table[Offset], fat, sizeof(FAT_ENTRY));
return 0;
}
return -1;
}
MIRROR_LRU *CreateFatLRU(VOLUME *volume, ULONG cluster,
ULONG mirror, ULONG index)
{
register MIRROR_LRU *lru;
register ULONG retCode;
lru = AllocateFAT_LRUElement(volume);
if (lru)
{
retCode = ReadPhysicalVolumeCluster(volume, cluster, lru->CacheBuffer,
volume->ClusterSize,
FAT_PRIORITY);
if (retCode)
{
FreeFAT_LRUElement(lru);
return 0;
}
lru->ModLock = 0;
lru->BlockState = L_DATAVALID;
lru->Cluster1 = cluster;
lru->Cluster2 = mirror;
lru->BlockIndex = index;
InsertFAT(volume, lru);
retCode = AddToFATHash(volume, lru);
if (retCode)
{
RemoveFAT(volume, lru);
FreeFAT_LRUElement(lru);
return 0;
}
retCode = SetAssignedClusterValue(volume, cluster, 1);
if (retCode)
{
NWFSPrint("nwfs: assigned bit block value not set cluster-%X\n",
(unsigned int)cluster);
}
retCode = SetAssignedClusterValue(volume, mirror, 1);
if (retCode)
{
NWFSPrint("nwfs: assigned bit block value not set mirror-%X\n",
(unsigned int)mirror);
}
return lru;
}
return 0;
}
FAT_ENTRY *GetFatEntry(VOLUME *volume, ULONG Cluster, FAT_ENTRY *fat)
{
register LRU_HASH_LIST *HashTable;
register FAT_ENTRY *Table;
register MIRROR_LRU *lru;
register ULONG hash;
register ULONG EntriesPerCluster;
register ULONG Block, Offset;
if ((Cluster == (ULONG) -1) || (Cluster & 0x80000000))
return 0;
if (Cluster > (volume->MountedVolumeClusters - 1))
return 0;
EntriesPerCluster = volume->ClusterSize / sizeof(FAT_ENTRY);
Block = Cluster / EntriesPerCluster;
Offset = Cluster % EntriesPerCluster;
hash = (Block & (volume->FATBlockHashLimit - 1));
HashTable = (LRU_HASH_LIST *) volume->FATBlockHash;
if (!HashTable)
{
return 0;
}
lru = (MIRROR_LRU *) HashTable[hash].head;
while (lru)
{
if (lru->BlockIndex == Block)
{
Table = (FAT_ENTRY *) lru->CacheBuffer;
if (fat)
{
NWFSCopy(fat, &Table[Offset], sizeof(FAT_ENTRY));
return fat;
}
return 0;
}
lru = lru->hashNext;
}
return 0;
}
FAT_ENTRY *GetFatEntryAndLRU(VOLUME *volume, ULONG Cluster,
MIRROR_LRU **rlru, FAT_ENTRY *fat)
{
register LRU_HASH_LIST *HashTable;
register FAT_ENTRY *Table;
register MIRROR_LRU *lru;
register ULONG hash;
register ULONG EntriesPerCluster;
register ULONG Block, Offset;
if ((Cluster == (ULONG) -1) || (Cluster & 0x80000000))
return 0;
if (Cluster > (volume->MountedVolumeClusters - 1))
return 0;
if (rlru)
*rlru = 0;
EntriesPerCluster = volume->ClusterSize / sizeof(FAT_ENTRY);
Block = Cluster / EntriesPerCluster;
Offset = Cluster % EntriesPerCluster;
hash = (Block & (volume->FATBlockHashLimit - 1));
HashTable = (LRU_HASH_LIST *) volume->FATBlockHash;
if (!HashTable)
return 0;
lru = (MIRROR_LRU *) HashTable[hash].head;
while (lru)
{
if (lru->BlockIndex == Block)
{
Table = (FAT_ENTRY *) lru->CacheBuffer;
if (rlru)
*rlru = lru;
if (fat)
{
NWFSCopy(fat, &Table[Offset], sizeof(FAT_ENTRY));
return fat;
}
return 0;
}
lru = lru->hashNext;
}
return 0;
}
ULONG ReadFATTable(VOLUME *volume)
{
register MIRROR_LRU *lru;
register FAT_ENTRY *FAT1, *FAT2, *verify;
FAT_ENTRY FAT1_S, FAT2_S, VFAT_S;
register ULONG retCode;
register long index1, index2;
register ULONG Block, cluster1, cluster2, i, rebuild_flag = 0;
register ULONG last_cluster1, last_cluster2;
register BYTE *FATCopy;
FATCopy = NWFSCacheAlloc(volume->ClusterSize, FAT_WORKSPACE_TAG);
if (!FATCopy)
return -3;
#if (MOUNT_VERBOSE)
NWFSPrint("*** Reading FAT Tables ***\n");
#endif
ReadTable:;
Block = 0;
last_cluster1 = 0;
last_cluster2 = 0;
cluster1 = volume->FirstFAT;
cluster2 = volume->SecondFAT;
if (!cluster2)
{
NWFSPrint("ffat-%X sfat-%x fdir-%x sdir-%X\n",
(unsigned int) volume->FirstFAT,
(unsigned int) volume->SecondFAT,
(unsigned int) volume->FirstDirectory,
(unsigned int) volume->SecondDirectory);
NWFSPrint("nwfs: second FAT is NULL\n");
NWFSFree(FATCopy);
return -1;
}
lru = CreateFatLRU(volume, cluster1, cluster2, Block);
if (!lru)
{
NWFSPrint("nwfs: could not allocate LRU element in ReadFATTables\n");
NWFSFree(FATCopy);
return -1;
}
retCode = ReadPhysicalVolumeCluster(volume, cluster2, FATCopy,
volume->ClusterSize,
FAT_PRIORITY);
if (retCode)
{
NWFSPrint("nwfs: could not read volume cluster in ReadFATTables\n");
NWFSFree(FATCopy);
return retCode;
}
FAT1 = GetFatEntry(volume, cluster1, &FAT1_S);
FAT2 = GetFatEntry(volume, cluster2, &FAT2_S);
if (!FAT1 || !FAT2)
{
NWFSPrint("nwfs: error reading fat entry ReadFATTables\n");
NWFSFree(FATCopy);
return -1;
}
index1 = FAT1->FATIndex;
index2 = FAT2->FATIndex;
while (TRUE)
{
if (NWFSCompare(lru->CacheBuffer, FATCopy, volume->ClusterSize))
{
nwvp_fat_fix_info fix_info;
// if we get a mirror mismatch, rebuild the
// FAT tables and attempt remount of the volume fat.
// if we have already attempted fat table repair once, and it
// failed, then abort the mount and report a mirror mismatch.
if (rebuild_flag)
{
extern void dumpRecordBytes(BYTE *, ULONG);
register BYTE *p = lru->CacheBuffer;
for (i=0; i < (volume->ClusterSize / 64); i++)
{
if (NWFSCompare(&p[i * 64], &FATCopy[i * 64], 64))
{
NWFSPrint("nwfs: FAT data mirror mismatch\n");
NWFSPrint("offset into cluster is 0x%X (%u bytes)\n",
(unsigned)(i * 64), (unsigned)(i * 64));
NWFSPrint("index1-%d cluster1-[%08X] next1-[%08X]\n", (int)index1,
(unsigned int)cluster1,
(unsigned int)FAT1->FATCluster);
dumpRecordBytes(&p[i * 64], 64);
NWFSPrint("index2-%d cluster2-[%08X] next2-[%08X]\n", (int)index2,
(unsigned int)cluster2,
(unsigned int)FAT2->FATCluster);
dumpRecordBytes(&FATCopy[i * 64], 64);
break;
}
}
NWFSFree(FATCopy);
return -3;
}
rebuild_flag++;
NWFSPrint("nwfs: Fat Mismatch Volume %s - Recovering Fat Journal\n",
volume->VolumeName);
FlushVolumeLRU(volume);
FreeFATLists(volume);
retCode = nwvp_vpartition_fat_fix(volume->nwvp_handle, &fix_info, 1);
if (retCode)
{
NWFSPrint("nwfs: could not resolve volume fat table errors\n");
NWFSFree(FATCopy);
return -3;
}
retCode = InitializeFAT_LRU(volume);
if (retCode)
{
NWFSPrint("nwfs: could not allocate space for volume fat\n");
NWFSFree(FATCopy);
return -3;
}
goto ReadTable;
}
if (FAT1->FATCluster == (ULONG) -1)
break;
if (FAT2->FATCluster == (ULONG) -1)
break;
if (!FAT1->FATCluster)
{
NWFSPrint("nwfs: Free Cluster Detected in FAT1 Chain\n");
NWFSFree(FATCopy);
return -3;
}
if (!FAT2->FATCluster)
{
NWFSPrint("nwfs: Free Cluster Detected in FAT2 Chain\n");
NWFSFree(FATCopy);
return -3;
}
if (FAT1->FATCluster & 0x80000000)
{
NWFSPrint("nwfs: SubAlloc Node Detected in FAT1\n");
NWFSFree(FATCopy);
return -3;
}
if (FAT2->FATCluster & 0x80000000)
{
NWFSPrint("nwfs: SubAlloc Node Detected in FAT2\n");
NWFSFree(FATCopy);
return -3;
}
Block++;
last_cluster1 = cluster1;
last_cluster2 = cluster2;
cluster1 = FAT1->FATCluster;
cluster2 = FAT2->FATCluster;
if (last_cluster1 > cluster1)
{
NWFSPrint("nwfs: FAT1 chain overlaps on itself\n");
NWFSFree(FATCopy);
return -1;
}
if (last_cluster2 > cluster2)
{
NWFSPrint("nwfs: FAT2 chain overlaps on itself\n");
NWFSFree(FATCopy);
return -1;
}
lru = CreateFatLRU(volume, cluster1, cluster2, Block);
if (!lru)
{
NWFSPrint("nwfs: could not allocate LRU element in ReadFATTables\n");
NWFSFree(FATCopy);
return -1;
}
retCode = ReadPhysicalVolumeCluster(volume,
cluster2,
FATCopy,
volume->ClusterSize,
FAT_PRIORITY);
if (retCode)
{
NWFSPrint("nwfs: Read Error FAT2 returned %d\n", (int)retCode);
NWFSFree(FATCopy);
return retCode;
}
FAT1 = GetFatEntry(volume, cluster1, &FAT1_S);
FAT2 = GetFatEntry(volume, cluster2, &FAT2_S);
if (!FAT1 || !FAT2)
{
NWFSPrint("nwfs: error reading fat entry ReadFATTables\n");
NWFSFree(FATCopy);
return -1;
}
if (index1 > FAT1->FATIndex)
{
NWFSPrint("nwfs: FAT1 index overlaps on itself\n");
NWFSFree(FATCopy);
return -1;
}
if (index2 > FAT2->FATIndex)
{
NWFSPrint("nwfs: FAT2 index overlaps on itself\n");
NWFSFree(FATCopy);
return -1;
}
index1 = FAT1->FATIndex;
index2 = FAT2->FATIndex;
}
NWFSFree(FATCopy);
if (FAT1->FATCluster != FAT2->FATCluster)
{
NWFSPrint("nwfs: FAT Table chain mirror mismatch\n");
return -3;
}
#if (MOUNT_VERBOSE)
NWFSPrint("*** Verifying FAT Tables ***\n");
#endif
for (i=0; i < volume->MountedVolumeClusters; i++)
{
verify = GetFatEntry(volume, i, &VFAT_S);
if (verify)
{
if (verify->FATCluster)
{
retCode = SetFreeClusterValue(volume, i, 1); // block is allocated
if (retCode)
{
NWFSPrint("nwfs: bit block value not set cluster-%X [1]\n",
(unsigned int)i);
}
// this is a sanity check for ECC memory bit errors
if (!GetFreeClusterValue(volume, i))
{
NWFSPrint("nwfs: bit block value incorrect cluster-%X [1]\n",
(unsigned int)i);
}
volume->VolumeAllocatedClusters++;
}
else
{
retCode = SetFreeClusterValue(volume, i, 0); // block is free
if (retCode)
{
NWFSPrint("nwfs: bit block value not set cluster-%X [0]\n",
(unsigned int)i);
}
// this is a sanity check for ECC memory bit errors
if (GetFreeClusterValue(volume, i))
{
NWFSPrint("nwfs: bit block value incorrect cluster-%X [0]\n",
(unsigned int)i);
}
volume->VolumeFreeClusters++;
}
}
else
{
NWFSPrint("nwfs: FAT Table data errors detected\n");
return -1;
}
}
return 0;
}
#else
ULONG FreeFAT_LRU(VOLUME *volume)
{
register MIRROR_LRU *lru;
while (volume->FATListHead)
{
lru = RemoveFAT(volume, (MIRROR_LRU *)volume->FATListHead);
if (lru)
NWFSFree(lru);
}
if (volume->FATBlockHash)
NWFSFree(volume->FATBlockHash);
volume->FATBlockHashLimit =0;
volume->FATBlockHash = 0;
return 0;
}
MIRROR_LRU *AllocateFAT_LRUElement(VOLUME *volume)
{
register MIRROR_LRU *lru;
lru = NWFSAlloc(sizeof(MIRROR_LRU), FATLRU_TAG);
if (!lru)
return 0;
NWFSSet(lru, 0, sizeof(MIRROR_LRU));
lru->BlockState = L_FREE;
lru->Cluster1 = -1;
lru->Cluster2 = -1;
lru->ClusterSize = volume->ClusterSize;
return lru;
}
void FreeFAT_LRUElement(MIRROR_LRU *lru)
{
NWFSFree(lru);
return;
}
ULONG WriteFATEntry(VOLUME *volume, MIRROR_LRU *lru,
FAT_ENTRY *fat, ULONG Cluster)
{
register ULONG EntriesPerCluster;
register ULONG Offset, cbytes;
ULONG retCode = 0;
EntriesPerCluster = volume->ClusterSize / sizeof(FAT_ENTRY);
Offset = Cluster % EntriesPerCluster;
if (lru->Cluster1 != (ULONG) -1)
{
cbytes = WriteClusterWithOffset(volume,
lru->Cluster1,
Offset * sizeof(FAT_ENTRY),
(BYTE *)fat,
sizeof(FAT_ENTRY),
KERNEL_ADDRESS_SPACE,
&retCode,
FAT_PRIORITY);
if ((cbytes == sizeof(FAT_ENTRY)) && !retCode)
{
if (lru->Cluster2 != (ULONG) -1)
{
#if (!CREATE_FAT_MISMATCH)
cbytes = WriteClusterWithOffset(volume,
lru->Cluster2,
Offset * sizeof(FAT_ENTRY),
(BYTE *)fat,
sizeof(FAT_ENTRY),
KERNEL_ADDRESS_SPACE,
&retCode,
FAT_PRIORITY);
if ((cbytes == sizeof(FAT_ENTRY)) && !retCode)
#endif
return 0;
}
}
}
return -1;
}
MIRROR_LRU *CreateFatLRU(VOLUME *volume, ULONG cluster,
ULONG mirror, ULONG index)
{
register MIRROR_LRU *lru;
register ULONG retCode;
lru = AllocateFAT_LRUElement(volume);
if (lru)
{
lru->ModLock = 0;
lru->BlockState = L_DATAVALID;
lru->Cluster1 = cluster;
lru->Cluster2 = mirror;
lru->BlockIndex = index;
InsertFAT(volume, lru);
retCode = AddToFATHash(volume, lru);
if (retCode)
{
RemoveFAT(volume, lru);
FreeFAT_LRUElement(lru);
return 0;
}
retCode = SetAssignedClusterValue(volume, cluster, 1);
if (retCode)
{
NWFSPrint("nwfs: assigned bit block value not set cluster-%X\n",
(unsigned int)cluster);
}
retCode = SetAssignedClusterValue(volume, mirror, 1);
if (retCode)
{
NWFSPrint("nwfs: assigned bit block value not set mirror-%X\n",
(unsigned int)mirror);
}
return lru;
}
return 0;
}
FAT_ENTRY *GetFatEntry(VOLUME *volume, ULONG Cluster, FAT_ENTRY *fat)
{
register LRU_HASH_LIST *HashTable;
register MIRROR_LRU *lru;
register ULONG hash, cbytes;
register ULONG EntriesPerCluster;
register ULONG Block, Offset;
ULONG retCode = 0;
if ((Cluster == (ULONG) -1) || (Cluster & 0x80000000))
return 0;
if (Cluster > (volume->MountedVolumeClusters - 1))
return 0;
EntriesPerCluster = volume->ClusterSize / sizeof(FAT_ENTRY);
Block = Cluster / EntriesPerCluster;
Offset = Cluster % EntriesPerCluster;
hash = (Block & (volume->FATBlockHashLimit - 1));
HashTable = (LRU_HASH_LIST *) volume->FATBlockHash;
if (!HashTable)
{
return 0;
}
lru = (MIRROR_LRU *) HashTable[hash].head;
while (lru)
{
if (lru->BlockIndex == Block)
{
if (fat)
{
if (lru->Cluster1 != (ULONG) -1)
{
cbytes = ReadClusterWithOffset(volume,
lru->Cluster1,
Offset * sizeof(FAT_ENTRY),
(BYTE *)fat,
sizeof(FAT_ENTRY),
KERNEL_ADDRESS_SPACE,
&retCode,
FAT_PRIORITY);
if ((cbytes == sizeof(FAT_ENTRY)) && !retCode)
return fat;
if (lru->Cluster2 != (ULONG) -1)
{
cbytes = ReadClusterWithOffset(volume,
lru->Cluster2,
Offset * sizeof(FAT_ENTRY),
(BYTE *)fat,
sizeof(FAT_ENTRY),
KERNEL_ADDRESS_SPACE,
&retCode,
FAT_PRIORITY);
if ((cbytes == sizeof(FAT_ENTRY)) && !retCode)
return fat;
}
}
}
return 0;
}
lru = lru->hashNext;
}
return 0;
}
FAT_ENTRY *GetFatEntryAndLRU(VOLUME *volume, ULONG Cluster,