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nwfile.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 : NWFILE.C
* DESCRIP : NetWare File Management
* DATE : December 14, 1998
*
*
***************************************************************************/
#include "globals.h"
ULONG NWLockFile(HASH *hash)
{
#if (LINUX_SLEEP)
if (WaitOnSemaphore((struct semaphore *)&hash->Semaphore) == -EINTR)
NWFSPrint("lock file (%s) was interrupted\n", hash->Name);
#endif
return 0;
}
ULONG NWLockFileExclusive(HASH *hash)
{
#if (LINUX_SLEEP)
if (WaitOnSemaphore((struct semaphore *)&hash->Semaphore) == -EINTR)
NWFSPrint("lock file (%s) was interrupted\n", hash->Name);
#endif
return 0;
}
void NWUnlockFile(HASH *hash)
{
#if (LINUX_SLEEP)
SignalSemaphore(&hash->Semaphore);
#endif
}
#if (WINDOWS_NT_UTIL | DOS_UTIL | LINUX_UTIL | LINUX_20 | LINUX_22 | LINUX_24)
ULONG NWSyncFile(VOLUME *volume, HASH *hash)
{
register long FATChain;
register ULONG ccode;
register FAT_ENTRY *FAT;
FAT_ENTRY FAT_S;
SUBALLOC_MAP map;
extern ULONG SyncCluster(VOLUME *, ULONG);
#if (!HASH_FAT_CHAINS)
DOS dos;
#endif
if (!hash || (hash->Flags & SUBDIRECTORY_FILE))
return (ULONG) -1;
#if (HASH_FAT_CHAINS)
FATChain = hash->FirstBlock;
#else
ccode = ReadDirectoryRecord(volume, &dos, hash->DirNo);
if (ccode)
return -1;
FATChain = dos.FirstBlock;
#endif
if (FATChain & 0x80000000)
{
// check for EOF
if (FATChain == (ULONG) -1)
return 0;
ccode = MapSuballocNode(volume, &map, FATChain);
if (ccode)
return (ULONG) ccode;
if (map.Count == 1)
{
ccode = SyncCluster(volume, map.clusterNumber[0]);
if (ccode)
return ccode;
}
else
{
ccode = SyncCluster(volume, map.clusterNumber[0]);
if (ccode)
return ccode;
ccode = SyncCluster(volume, map.clusterNumber[1]);
if (ccode)
return ccode;
}
}
FAT = GetFatEntry(volume, FATChain, &FAT_S);
while (FAT && FAT->FATCluster)
{
ccode = SyncCluster(volume, FATChain);
if (ccode)
return ccode;
// bump to the next cluster
FATChain = FAT->FATCluster;
// check if the next cluster is a suballoc element or EOF marker
if (FATChain & 0x80000000)
{
// end of file
if (FATChain == (ULONG) -1)
return 0;
ccode = MapSuballocNode(volume, &map, FATChain);
if (ccode)
return (ULONG) ccode;
if (map.Count == 1)
{
ccode = SyncCluster(volume, map.clusterNumber[0]);
if (ccode)
return ccode;
}
else
{
ccode = SyncCluster(volume, map.clusterNumber[0]);
if (ccode)
return ccode;
ccode = SyncCluster(volume, map.clusterNumber[1]);
if (ccode)
return ccode;
}
return 0;
}
FAT = GetFatEntry(volume, FATChain, &FAT_S);
}
return 0;
}
ULONG NWReadFile(VOLUME *volume, ULONG *Chain, ULONG Flags, ULONG FileSize,
ULONG offset, BYTE *buf, long count, long *Context,
ULONG *Index, ULONG *retCode, ULONG as, ULONG SAFlag,
ULONG Attributes, ULONG readAhead)
{
register long PrevContext = 0;
register ULONG PrevIndex = 0;
register ULONG FATChain, index;
register long bytesRead = 0, bytesLeft = 0;
register ULONG StartIndex, StartOffset;
register FAT_ENTRY *FAT;
FAT_ENTRY FAT_S;
register ULONG voffset, vsize, vindex, cbytes;
if (!Chain)
return 0;
if (!(*Chain))
return 0;
if (retCode)
*retCode = 0;
// adjust size and range check for EOF
if ((offset + count) > FileSize)
count = FileSize - offset;
if (count <= 0)
return 0;
// if a subdirectory then return 0
if (Flags & SUBDIRECTORY_FILE)
{
if (retCode)
*retCode = NwInvalidParameter;
return 0;
}
bytesLeft = count;
StartIndex = offset / volume->ClusterSize;
StartOffset = offset % volume->ClusterSize;
// we always start with an index of zero
index = 0;
FATChain = *Chain;
vindex = StartIndex;
// see if we are starting on or after the supplied index/cluster pointer.
// if (StartIndex < *Index), then we are being asked to start before
// the user supplied context. In this case, start at the beginning of
// the chain.
if (Index && (StartIndex >= (*Index)))
{
if (Context && (*Context))
{
PrevContext = FATChain = *Context;
PrevIndex = index = *Index;
}
}
if ((bytesLeft > 0) && (FATChain & 0x80000000))
{
// check for EOF
if (FATChain == (ULONG) -1)
{
// filesize may exceed allocation, which means the rest of
// the file is sparse. fill zeros into the requested
// size. bytesLeft will have been set by count, which is
// range checked to the actual length of the file.
if (bytesLeft > 0)
{
if (buf)
{
if (NWFSSetUserSpace(buf, 0, bytesLeft))
{
if (retCode)
*retCode = NwMemoryFault;
return bytesRead;
}
}
bytesRead += bytesLeft;
}
if (Context)
*Context = PrevContext;
if (Index)
*Index = PrevIndex;
return bytesRead;
}
// if we got here, then we detected a suballocation element. See
// if this is legal for this file.
if ((!SAFlag) || (Attributes & NO_SUBALLOC) ||
(Attributes & TRANSACTION) || (Flags & RAW_FILE))
{
if (retCode)
*retCode = NwNotPermitted;
return bytesRead;
}
// check for valid index
if (index == vindex)
{
voffset = 0;
if (vindex == StartIndex)
voffset = StartOffset;
// if this value exceeds the suballoc record size,
// ReadSuballoc record will reduce this size to the
// current record allocation.
vsize = bytesLeft;
if (buf)
cbytes = ReadSuballocRecord(volume, voffset, FATChain, buf, vsize, as, retCode);
else
cbytes = vsize;
bytesRead += cbytes;
bytesLeft -= cbytes;
buf += cbytes;
if (Context)
*Context = FATChain;
if (Index)
*Index = index;
}
// filesize may exceed allocation, which means the rest of
// the file is sparse. fill zeros into the requested
// size.
if (bytesLeft > 0)
{
if (buf)
{
if (NWFSSetUserSpace(buf, 0, bytesLeft))
{
if (retCode)
*retCode = NwMemoryFault;
return bytesRead;
}
}
bytesRead += bytesLeft;
}
return bytesRead;
}
vindex = StartIndex;
FAT = GetFatEntry(volume, FATChain, &FAT_S);
if (FAT)
{
if (Context)
*Context = FATChain;
index = FAT->FATIndex;
if (Index)
*Index = index;
}
while (FAT && FAT->FATCluster && (bytesLeft > 0))
{
// if we found a hole, then return zeros until we
// either satisfy the requested read size or
// we span to the next valid index entry
while ((bytesLeft > 0) && (vindex < index))
{
voffset = 0;
if (vindex == StartIndex)
voffset = StartOffset;
vsize = (bytesLeft > (long)(volume->ClusterSize - voffset))
? (volume->ClusterSize - voffset) : bytesLeft;
if (buf)
{
if (NWFSSetUserSpace(buf, 0, vsize))
{
if (retCode)
*retCode = NwMemoryFault;
return bytesRead;
}
}
bytesRead += vsize;
bytesLeft -= vsize;
buf += vsize;
vindex++;
}
// found our index block, perform the copy operation
if ((bytesLeft > 0) && (vindex == index))
{
voffset = 0;
if (vindex == StartIndex)
voffset = StartOffset;
vsize = (bytesLeft > (long)(volume->ClusterSize - voffset))
? (volume->ClusterSize - voffset) : bytesLeft;
if (buf)
cbytes = ReadClusterWithOffset(volume, FATChain, voffset, buf, vsize,
as, retCode,
((Flags & RAW_FILE)
? RAW_PRIORITY
: DATA_PRIORITY));
else
cbytes = vsize;
#if (READ_AHEAD_ON)
// do read ahead on the next valid cluster
if (((FAT->FATCluster & 0x80000000) == 0) && (buf) && readAhead &&
(!(Flags & RAW_FILE)))
{
ULONG mirror = (ULONG)-1;
PerformBlockReadAhead(&DataLRU, volume,
(FAT->FATCluster * volume->BlocksPerCluster),
volume->BlocksPerCluster, 1, &mirror);
}
#endif
bytesRead += cbytes;
bytesLeft -= cbytes;
buf += cbytes;
vindex++;
}
// bump to the next cluster
PrevContext = FATChain;
PrevIndex = index;
FATChain = FAT->FATCluster;
// check if the next cluster is a suballoc element or EOF marker
if ((bytesLeft > 0) && (FATChain & 0x80000000))
{
// end of file
if (FATChain == (ULONG) -1)
{
// filesize may exceed allocation, which means the rest of
// the file is sparse. fill zeros into the requested
// size.
if (bytesLeft > 0)
{
if (buf)
{
if (NWFSSetUserSpace(buf, 0, bytesLeft))
{
if (retCode)
*retCode = NwMemoryFault;
return bytesRead;
}
}
bytesRead += bytesLeft;
}
if (Context)
*Context = PrevContext;
if (Index)
*Index = PrevIndex;
return bytesRead;
}
// if we got here, then we detected a suballocation element. See
// if this is legal for this file.
if ((!SAFlag) || (Attributes & NO_SUBALLOC) ||
(Attributes & TRANSACTION) || (Flags & RAW_FILE))
{
if (retCode)
*retCode = NwNotPermitted;
return bytesRead;
}
// check for valid index
if ((index + 1) == vindex)
{
voffset = 0;
if (vindex == StartIndex)
voffset = StartOffset;
// if this value exceeds the suballoc record size,
// ReadSuballoc record will reduce this size to the
// current record allocation.
vsize = bytesLeft;
if (buf)
cbytes = ReadSuballocRecord(volume, voffset, FATChain, buf,
vsize, as, retCode);
else
cbytes = vsize;
bytesRead += cbytes;
bytesLeft -= cbytes;
buf += cbytes;
if (Context)
*Context = FATChain;
if (Index)
*Index = (index + 1);
}
// filesize may exceed allocation, which means the rest of
// the file is sparse. fill zeros into the requested
// size.
if (bytesLeft > 0)
{
if (buf)
{
if (NWFSSetUserSpace(buf, 0, bytesLeft))
{
if (retCode)
*retCode = NwMemoryFault;
return bytesRead;
}
}
bytesRead += bytesLeft;
}
return bytesRead;
}
// get next fat table entry and index
FAT = GetFatEntry(volume, FATChain, &FAT_S);
if (FAT)
{
if (Context)
*Context = FATChain;
index = FAT->FATIndex;
if (Index)
*Index = index;
}
}
// filesize may exceed allocation, which means the rest of
// the file is sparse. fill zeros into the requested
// size.
if (bytesLeft > 0)
{
if (buf)
{
if (NWFSSetUserSpace(buf, 0, bytesLeft))
{
if (retCode)
*retCode = NwMemoryFault;
return bytesRead;
}
}
bytesRead += bytesLeft;
}
return bytesRead;
}
//
// if you pass a NULL buffer address, this function will extend the
// meta-data for a file and preallocate mapped space for memory mapped
// file support.
//
ULONG NWWriteFile(VOLUME *volume, ULONG *Chain, ULONG Flags,
ULONG offset, BYTE *buf, long count, long *Context,
ULONG *Index, ULONG *retCode, ULONG as, ULONG SAFlag,
ULONG Attributes)
{
register long PrevContext = 0;
register ULONG PrevIndex = 0;
register ULONG FATChain, index;
register long bytesWritten = 0, bytesLeft = 0;
register ULONG lcount = 0;
register ULONG StartIndex, StartOffset, SuballocSize;
register FAT_ENTRY *FAT;
FAT_ENTRY FAT_S;
register ULONG voffset, vsize, vindex, cbytes;
register ULONG PrevCluster, NewCluster;
register VOLUME_WORKSPACE *WorkSpace;
MIRROR_LRU *lru = 0;
if (!Chain)
return 0;
if (!(*Chain))
{
NWFSPrint("nwfs: fat chain was NULL (write)\n");
if (retCode)
*retCode = NwFileCorrupt;
return 0;
}
if (retCode)
*retCode = 0;
// if a subdirectory then return 0
if (Flags & SUBDIRECTORY_FILE)
{
if (retCode)
*retCode = NwInvalidParameter;
return 0;
}
bytesLeft = count;
StartIndex = offset / volume->ClusterSize;
StartOffset = offset % volume->ClusterSize;
// we always start with an index of zero
index = 0;
PrevCluster = (ULONG) -1;
FATChain = *Chain;
vindex = StartIndex;
#if (VERBOSE)
NWFSPrint("nwfs_write: count-%d offset-%d ctx-%08X ndx-%08X chn-%08X\n",
(int)count, (int)offset,
(unsigned int) (Context ? *Context : 0),
(unsigned int) (Index ? *Index : 0),
(unsigned int) *Chain);
#endif
// see if we are starting on or after the supplied index/cluster pointer.
// if (StartIndex < *Index), then we are being asked to start before
// the user supplied context. In this case, start at the beginning of
// the chain.
if (Index && (StartIndex >= (*Index)))
{
if (Context && (*Context))
{
PrevContext = FATChain = *Context;
PrevIndex = index = *Index;
}
}
if ((bytesLeft > 0) && (FATChain & 0x80000000))
{
// check for EOF
if (FATChain == (ULONG) -1)
{
while (bytesLeft > 0)
{
voffset = 0;
if (vindex == StartIndex)
voffset = StartOffset;
vsize = (bytesLeft > (long)(volume->ClusterSize - voffset))
? (volume->ClusterSize - voffset) : bytesLeft;
// allocate cluster and point forward link to EOF
NewCluster = AllocateClusterSetIndexSetChain(volume, vindex, -1);
if (NewCluster == -1)
{
// if we could not get a free cluster, then return
// (out of drive space)
if (retCode)
*retCode = NwVolumeFull;
return bytesWritten;
}
#if (ZERO_FILL_SECTORS)
// zero fill the new cluster
ZeroPhysicalVolumeCluster(volume, NewCluster, ((Flags & RAW_FILE) ? RAW_PRIORITY : DATA_PRIORITY));
#endif
// set previous cluster chain to point to this entry
if (PrevCluster == (ULONG) -1)
*Chain = NewCluster;
else
SetClusterValue(volume, PrevCluster, NewCluster);
// update previous cluster to new cluster
// this will force inserts after the end of this cluster
PrevCluster = NewCluster;
if (buf)
cbytes = WriteClusterWithOffset(volume, NewCluster, voffset, buf, vsize,
as, retCode, ((Flags & RAW_FILE) ? RAW_PRIORITY : DATA_PRIORITY));
else
cbytes = vsize;
bytesWritten += cbytes;
bytesLeft -= cbytes;
buf += cbytes;
// update context pointer with adjusted offset
if (Context)
*Context = NewCluster;
if (Index)
*Index = vindex;
vindex++;
}
return bytesWritten;
}
// we have detected a suballoc element in the fat chain if we
// get to this point
// if we got here, then we detected a suballocation element. See
// if this is legal for this file.
if ((!SAFlag) || (Attributes & NO_SUBALLOC) ||
(Attributes & TRANSACTION) || (Flags & RAW_FILE))
{
if (retCode)
*retCode = NwNotPermitted;
return bytesWritten;
}
SuballocSize = GetSuballocSize(volume, FATChain);
voffset = 0;
if (vindex == StartIndex)
voffset = StartOffset;
// these cases assume we will free the current suballoc element
// because our write either exceeds the current suballoc size
// or we are writing our starting index beyond the suballocation
// element itself in the chain. In either case, we must free
// the current suballocation element.
// if we are asked to write beyond the current suballoc element
if (vindex > index)
{
#if (VERBOSE)
NWFSPrint("nwfs: we were asked to write to the next index\n");
#endif
// convert the suballoc record into an allocated cluster
// and copy the data from the suballoc record.
WorkSpace = AllocateWorkspace(volume);
if (!WorkSpace)
{
// if we could not get memory to copy the suballoc record,
// then return (out of drive space)
if (retCode)
*retCode = NwInsufficientResources;
return bytesWritten;
}
voffset = 0;
if (vindex == StartIndex)
voffset = StartOffset;
vsize = (bytesLeft > (long)(volume->ClusterSize - voffset))
? (volume->ClusterSize - voffset) : bytesLeft;
// allocate cluster and point forward link to EOF
NewCluster = AllocateClusterSetIndexSetChain(volume, index, -1);
if (NewCluster == -1)
{
// if we could not get a free cluster, then return
// (out of drive space)
FreeWorkspace(volume, WorkSpace);
if (retCode)
*retCode = NwVolumeFull;
return bytesWritten;
}
#if (ZERO_FILL_SECTORS)
// zero fill the new cluster
ZeroPhysicalVolumeCluster(volume, NewCluster, ((Flags & RAW_FILE) ? RAW_PRIORITY : DATA_PRIORITY));
#endif
// here we read the previous data from the suballoc element
cbytes = ReadSuballocRecord(volume, 0, FATChain,
&WorkSpace->Buffer[0],
SuballocSize, KERNEL_ADDRESS_SPACE,
retCode);
if (cbytes != SuballocSize)
{
FreeWorkspace(volume, WorkSpace);
if (retCode)
*retCode = NwDiskIoError;
return bytesWritten;
}
// now write the previous data from the suballoc element
// into the newly allocated cluster.
cbytes = WriteClusterWithOffset(volume, NewCluster, 0, &WorkSpace->Buffer[0], SuballocSize,
KERNEL_ADDRESS_SPACE, retCode,
((Flags & RAW_FILE) ? RAW_PRIORITY : DATA_PRIORITY));
if (cbytes != SuballocSize)
{
FreeWorkspace(volume, WorkSpace);
if (retCode)
*retCode = NwDiskIoError;
return bytesWritten;
}
// free the suballoc element in bit block list
FreeSuballocRecord(volume, FATChain);
// set previous cluster chain to point to this entry
if (PrevCluster == (ULONG) -1)
*Chain = NewCluster;
else
SetClusterValue(volume, PrevCluster, NewCluster);
PrevCluster = NewCluster;
// update context pointer with adjusted offset
if (Context)
*Context = NewCluster;
if (Index)
*Index = index;
FreeWorkspace(volume, WorkSpace);
while (bytesLeft > 0)
{
voffset = 0;
if (vindex == StartIndex)
voffset = StartOffset;
vsize = (bytesLeft > (long)(volume->ClusterSize - voffset))
? (volume->ClusterSize - voffset) : bytesLeft;
// allocate cluster and point forward link to EOF
NewCluster = AllocateClusterSetIndexSetChain(volume, vindex, -1);
if (NewCluster == -1)
{
// if we could not get a free cluster, then return
// (out of drive space)
if (retCode)
*retCode = NwVolumeFull;
return bytesWritten;
}
#if (ZERO_FILL_SECTORS)
// zero fill the new cluster
ZeroPhysicalVolumeCluster(volume, NewCluster, ((Flags & RAW_FILE) ? RAW_PRIORITY : DATA_PRIORITY));
#endif
// set previous cluster chain to point to this entry
SetClusterValue(volume, PrevCluster, NewCluster);
// update previous cluster to new cluster
// this will force inserts after the end of this cluster
PrevCluster = NewCluster;
if (buf)
cbytes = WriteClusterWithOffset(volume, NewCluster, voffset, buf, vsize,
as, retCode, ((Flags & RAW_FILE) ? RAW_PRIORITY : DATA_PRIORITY));
else
cbytes = vsize;
bytesWritten += cbytes;
bytesLeft -= cbytes;
buf += cbytes;
// update context pointer with adjusted offset
if (Context)
*Context = NewCluster;
if (Index)
*Index = vindex;
vindex++;
}
return bytesWritten;
}
else
if ((vindex == index) && ((bytesLeft + voffset) >= SuballocSize))
{
#if (VERBOSE)
NWFSPrint("nwfs: we were asked to write beyond the suballoc\n");
#endif
WorkSpace = AllocateWorkspace(volume);
if (!WorkSpace)
{
// if we could not get memory to copy the suballoc record,
// then return (out of drive space)
if (retCode)
*retCode = NwInsufficientResources;
return bytesWritten;
}
voffset = 0;
if (vindex == StartIndex)
voffset = StartOffset;
vsize = (bytesLeft > (long)(volume->ClusterSize - voffset))
? (volume->ClusterSize - voffset) : bytesLeft;
// allocate cluster and point forward link to EOF
NewCluster = AllocateClusterSetIndexSetChain(volume, vindex, (ULONG) -1);
if (NewCluster == -1)
{
// if we could not get a free cluster, then return
// (out of drive space)
FreeWorkspace(volume, WorkSpace);
if (retCode)
*retCode = NwVolumeFull;
return bytesWritten;
}
#if (ZERO_FILL_SECTORS)
// zero fill the new cluster
ZeroPhysicalVolumeCluster(volume, NewCluster, ((Flags & RAW_FILE) ? RAW_PRIORITY : DATA_PRIORITY));
#endif
// here we read the previous data from the suballoc element
cbytes = ReadSuballocRecord(volume, 0, FATChain, &WorkSpace->Buffer[0],
SuballocSize, KERNEL_ADDRESS_SPACE,
retCode);
if (cbytes != SuballocSize)
{
FreeWorkspace(volume, WorkSpace);
if (retCode)
*retCode = NwDiskIoError;
return bytesWritten;
}
// now write the previous data from the suballoc element
// into the newly allocated cluster.
cbytes = WriteClusterWithOffset(volume, NewCluster, 0, &WorkSpace->Buffer[0], SuballocSize,
KERNEL_ADDRESS_SPACE, retCode,
((Flags & RAW_FILE) ? RAW_PRIORITY : DATA_PRIORITY));
if (cbytes != SuballocSize)
{
FreeWorkspace(volume, WorkSpace);
if (retCode)
*retCode = NwDiskIoError;
return bytesWritten;
}
// free the suballoc element in bit block list
FreeSuballocRecord(volume, FATChain);
// if we are the first cluster, then save the chain head in
// the directory record
if (PrevCluster == (ULONG) -1)
*Chain = NewCluster;
else
SetClusterValue(volume, PrevCluster, NewCluster);
PrevCluster = NewCluster;
// now write the user data into the suballoc element
if (buf)
cbytes = WriteClusterWithOffset(volume, NewCluster, voffset, buf, vsize,
as, retCode, ((Flags & RAW_FILE) ? RAW_PRIORITY : DATA_PRIORITY));
else
cbytes = vsize;
bytesWritten += cbytes;
bytesLeft -= cbytes;
buf += cbytes;
// update context pointer with adjusted offset
if (Context)
*Context = NewCluster;
if (Index)
*Index = vindex;
vindex++;
FreeWorkspace(volume, WorkSpace);
while (bytesLeft > 0)
{
voffset = 0;
if (vindex == StartIndex)
voffset = StartOffset;
vsize = (bytesLeft > (long)(volume->ClusterSize - voffset))
? (volume->ClusterSize - voffset) : bytesLeft;
// allocate cluster and point forward link to EOF
NewCluster = AllocateClusterSetIndexSetChain(volume, vindex, -1);
if (NewCluster == -1)
{
// if we could not get a free cluster, then return
// (out of drive space)
if (retCode)
*retCode = NwVolumeFull;
return bytesWritten;
}
#if (ZERO_FILL_SECTORS)
// zero fill the new cluster
ZeroPhysicalVolumeCluster(volume, NewCluster, ((Flags & RAW_FILE) ? RAW_PRIORITY : DATA_PRIORITY));
#endif
// set previous cluster chain to point to this entry
SetClusterValue(volume, PrevCluster, NewCluster);
// update previous cluster to new cluster
// this will force inserts after the end of this cluster
PrevCluster = NewCluster;
if (buf)
cbytes = WriteClusterWithOffset(volume, NewCluster, voffset, buf, vsize,
as, retCode, ((Flags & RAW_FILE) ? RAW_PRIORITY : DATA_PRIORITY));
else
cbytes = vsize;
bytesWritten += cbytes;
bytesLeft -= cbytes;
buf += cbytes;
// update context pointer with adjusted offset
if (Context)
*Context = NewCluster;
if (Index)
*Index = vindex;
vindex++;
}
return bytesWritten;
}
else
if (vindex == index)
{
// for this case, since our target write size fits within
// the previously allocated suballoc element, then just
// write the data.
#if (VERBOSE)
NWFSPrint("nwfs: we were asked to write within the suballoc\n");
#endif
voffset = 0;
if (vindex == StartIndex)
voffset = StartOffset;
// at this point, bytesLeft is either equal to or
// less than the size of the current suballocation
// record.
vsize = bytesLeft;
if (buf)
cbytes = WriteSuballocRecord(volume, voffset, FATChain,
buf, vsize, as, retCode);
else
cbytes = vsize;
bytesWritten += cbytes;
bytesLeft -= cbytes;
}
else
NWFSPrint("nwfs: suballoc write was index(%d) < vindex(%d) (0)\n",
(int)index, (int)vindex);