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reactos/drivers/filesystems/fastfat/dir.c

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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: drivers/fs/vfat/dir.c
* PURPOSE: VFAT Filesystem : directory control
* UPDATE HISTORY:
19-12-1998 : created
*/
/* INCLUDES *****************************************************************/
#include "vfat.h"
#define NDEBUG
#include <debug.h>
/* FUNCTIONS ****************************************************************/
/* Function like DosDateTimeToFileTime */
BOOLEAN
FsdDosDateTimeToSystemTime(
PDEVICE_EXTENSION DeviceExt,
USHORT DosDate,
USHORT DosTime,
PLARGE_INTEGER SystemTime)
{
PDOSTIME pdtime = (PDOSTIME)&DosTime;
PDOSDATE pddate = (PDOSDATE)&DosDate;
TIME_FIELDS TimeFields;
LARGE_INTEGER LocalTime;
if (SystemTime == NULL)
return FALSE;
TimeFields.Milliseconds = 0;
TimeFields.Second = pdtime->Second * 2;
TimeFields.Minute = pdtime->Minute;
TimeFields.Hour = pdtime->Hour;
TimeFields.Day = pddate->Day;
TimeFields.Month = pddate->Month;
TimeFields.Year = (CSHORT)(DeviceExt->BaseDateYear + pddate->Year);
RtlTimeFieldsToTime(&TimeFields, &LocalTime);
ExLocalTimeToSystemTime(&LocalTime, SystemTime);
return TRUE;
}
/* Function like FileTimeToDosDateTime */
BOOLEAN
FsdSystemTimeToDosDateTime(
PDEVICE_EXTENSION DeviceExt,
PLARGE_INTEGER SystemTime,
PUSHORT pDosDate,
PUSHORT pDosTime)
{
PDOSTIME pdtime = (PDOSTIME)pDosTime;
PDOSDATE pddate = (PDOSDATE)pDosDate;
TIME_FIELDS TimeFields;
LARGE_INTEGER LocalTime;
if (SystemTime == NULL)
return FALSE;
ExSystemTimeToLocalTime(SystemTime, &LocalTime);
RtlTimeToTimeFields(&LocalTime, &TimeFields);
if (pdtime)
{
pdtime->Second = TimeFields.Second / 2;
pdtime->Minute = TimeFields.Minute;
pdtime->Hour = TimeFields.Hour;
}
if (pddate)
{
pddate->Day = TimeFields.Day;
pddate->Month = TimeFields.Month;
pddate->Year = (USHORT) (TimeFields.Year - DeviceExt->BaseDateYear);
}
return TRUE;
}
#define ULONG_ROUND_UP(x) ROUND_UP((x), (sizeof(ULONG)))
static
NTSTATUS
VfatGetFileNamesInformation(
PVFAT_DIRENTRY_CONTEXT DirContext,
PFILE_NAMES_INFORMATION pInfo,
ULONG BufferLength,
PULONG Written,
BOOLEAN First)
{
NTSTATUS Status;
ULONG BytesToCopy = 0;
*Written = 0;
Status = STATUS_BUFFER_OVERFLOW;
if (FIELD_OFFSET(FILE_NAMES_INFORMATION, FileName) > BufferLength)
return Status;
if (First || (BufferLength > FIELD_OFFSET(FILE_NAMES_INFORMATION, FileName) + DirContext->LongNameU.Length))
{
pInfo->FileNameLength = DirContext->LongNameU.Length;
*Written = FIELD_OFFSET(FILE_NAMES_INFORMATION, FileName);
pInfo->NextEntryOffset = 0;
if (BufferLength > FIELD_OFFSET(FILE_NAMES_INFORMATION, FileName))
{
BytesToCopy = min(DirContext->LongNameU.Length, BufferLength - FIELD_OFFSET(FILE_NAMES_INFORMATION, FileName));
RtlCopyMemory(pInfo->FileName,
DirContext->LongNameU.Buffer,
BytesToCopy);
*Written += BytesToCopy;
if (BytesToCopy == DirContext->LongNameU.Length)
{
pInfo->NextEntryOffset = ULONG_ROUND_UP(sizeof(FILE_NAMES_INFORMATION) +
BytesToCopy);
Status = STATUS_SUCCESS;
}
}
}
return Status;
}
static
NTSTATUS
VfatGetFileDirectoryInformation(
PVFAT_DIRENTRY_CONTEXT DirContext,
PDEVICE_EXTENSION DeviceExt,
PFILE_DIRECTORY_INFORMATION pInfo,
ULONG BufferLength,
PULONG Written,
BOOLEAN First)
{
NTSTATUS Status;
ULONG BytesToCopy = 0;
*Written = 0;
Status = STATUS_BUFFER_OVERFLOW;
if (FIELD_OFFSET(FILE_DIRECTORY_INFORMATION, FileName) > BufferLength)
return Status;
if (First || (BufferLength > FIELD_OFFSET(FILE_DIRECTORY_INFORMATION, FileName) + DirContext->LongNameU.Length))
{
pInfo->FileNameLength = DirContext->LongNameU.Length;
/* pInfo->FileIndex = ; */
*Written = FIELD_OFFSET(FILE_DIRECTORY_INFORMATION, FileName);
pInfo->NextEntryOffset = 0;
if (BufferLength > FIELD_OFFSET(FILE_DIRECTORY_INFORMATION, FileName))
{
BytesToCopy = min(DirContext->LongNameU.Length, BufferLength - FIELD_OFFSET(FILE_DIRECTORY_INFORMATION, FileName));
RtlCopyMemory(pInfo->FileName,
DirContext->LongNameU.Buffer,
BytesToCopy);
*Written += BytesToCopy;
if (BytesToCopy == DirContext->LongNameU.Length)
{
pInfo->NextEntryOffset = ULONG_ROUND_UP(sizeof(FILE_DIRECTORY_INFORMATION) +
BytesToCopy);
Status = STATUS_SUCCESS;
}
}
if (vfatVolumeIsFatX(DeviceExt))
{
FsdDosDateTimeToSystemTime(DeviceExt,
DirContext->DirEntry.FatX.CreationDate,
DirContext->DirEntry.FatX.CreationTime,
&pInfo->CreationTime);
FsdDosDateTimeToSystemTime(DeviceExt,
DirContext->DirEntry.FatX.AccessDate,
DirContext->DirEntry.FatX.AccessTime,
&pInfo->LastAccessTime);
FsdDosDateTimeToSystemTime(DeviceExt,
DirContext->DirEntry.FatX.UpdateDate,
DirContext->DirEntry.FatX.UpdateTime,
&pInfo->LastWriteTime);
pInfo->ChangeTime = pInfo->LastWriteTime;
if (BooleanFlagOn(DirContext->DirEntry.FatX.Attrib, FILE_ATTRIBUTE_DIRECTORY))
{
pInfo->EndOfFile.QuadPart = 0;
pInfo->AllocationSize.QuadPart = 0;
}
else
{
pInfo->EndOfFile.u.HighPart = 0;
pInfo->EndOfFile.u.LowPart = DirContext->DirEntry.FatX.FileSize;
/* Make allocsize a rounded up multiple of BytesPerCluster */
pInfo->AllocationSize.u.HighPart = 0;
pInfo->AllocationSize.u.LowPart = ROUND_UP(DirContext->DirEntry.FatX.FileSize,
DeviceExt->FatInfo.BytesPerCluster);
}
pInfo->FileAttributes = DirContext->DirEntry.FatX.Attrib & 0x3f;
}
else
{
FsdDosDateTimeToSystemTime(DeviceExt,
DirContext->DirEntry.Fat.CreationDate,
DirContext->DirEntry.Fat.CreationTime,
&pInfo->CreationTime);
FsdDosDateTimeToSystemTime(DeviceExt,
DirContext->DirEntry.Fat.AccessDate,
0,
&pInfo->LastAccessTime);
FsdDosDateTimeToSystemTime(DeviceExt,
DirContext->DirEntry.Fat.UpdateDate,
DirContext->DirEntry.Fat.UpdateTime,
&pInfo->LastWriteTime);
pInfo->ChangeTime = pInfo->LastWriteTime;
if (BooleanFlagOn(DirContext->DirEntry.Fat.Attrib, FILE_ATTRIBUTE_DIRECTORY))
{
pInfo->EndOfFile.QuadPart = 0;
pInfo->AllocationSize.QuadPart = 0;
}
else
{
pInfo->EndOfFile.u.HighPart = 0;
pInfo->EndOfFile.u.LowPart = DirContext->DirEntry.Fat.FileSize;
/* Make allocsize a rounded up multiple of BytesPerCluster */
pInfo->AllocationSize.u.HighPart = 0;
pInfo->AllocationSize.u.LowPart = ROUND_UP(DirContext->DirEntry.Fat.FileSize,
DeviceExt->FatInfo.BytesPerCluster);
}
pInfo->FileAttributes = DirContext->DirEntry.Fat.Attrib & 0x3f;
}
}
return Status;
}
static
NTSTATUS
VfatGetFileFullDirectoryInformation(
PVFAT_DIRENTRY_CONTEXT DirContext,
PDEVICE_EXTENSION DeviceExt,
PFILE_FULL_DIR_INFORMATION pInfo,
ULONG BufferLength,
PULONG Written,
BOOLEAN First)
{
NTSTATUS Status;
ULONG BytesToCopy = 0;
*Written = 0;
Status = STATUS_BUFFER_OVERFLOW;
if (FIELD_OFFSET(FILE_FULL_DIR_INFORMATION, FileName) > BufferLength)
return Status;
if (First || (BufferLength > FIELD_OFFSET(FILE_FULL_DIR_INFORMATION, FileName) + DirContext->LongNameU.Length))
{
pInfo->FileNameLength = DirContext->LongNameU.Length;
/* pInfo->FileIndex = ; */
pInfo->EaSize = 0;
*Written = FIELD_OFFSET(FILE_FULL_DIR_INFORMATION, FileName);
pInfo->NextEntryOffset = 0;
if (BufferLength > FIELD_OFFSET(FILE_FULL_DIR_INFORMATION, FileName))
{
BytesToCopy = min(DirContext->LongNameU.Length, BufferLength - FIELD_OFFSET(FILE_FULL_DIR_INFORMATION, FileName));
RtlCopyMemory(pInfo->FileName,
DirContext->LongNameU.Buffer,
BytesToCopy);
*Written += BytesToCopy;
if (BytesToCopy == DirContext->LongNameU.Length)
{
pInfo->NextEntryOffset = ULONG_ROUND_UP(sizeof(FILE_FULL_DIR_INFORMATION) +
BytesToCopy);
Status = STATUS_SUCCESS;
}
}
if (vfatVolumeIsFatX(DeviceExt))
{
FsdDosDateTimeToSystemTime(DeviceExt,
DirContext->DirEntry.FatX.CreationDate,
DirContext->DirEntry.FatX.CreationTime,
&pInfo->CreationTime);
FsdDosDateTimeToSystemTime(DeviceExt,
DirContext->DirEntry.FatX.AccessDate,
DirContext->DirEntry.FatX.AccessTime,
&pInfo->LastAccessTime);
FsdDosDateTimeToSystemTime(DeviceExt,
DirContext->DirEntry.FatX.UpdateDate,
DirContext->DirEntry.FatX.UpdateTime,
&pInfo->LastWriteTime);
pInfo->ChangeTime = pInfo->LastWriteTime;
pInfo->EndOfFile.u.HighPart = 0;
pInfo->EndOfFile.u.LowPart = DirContext->DirEntry.FatX.FileSize;
/* Make allocsize a rounded up multiple of BytesPerCluster */
pInfo->AllocationSize.u.HighPart = 0;
pInfo->AllocationSize.u.LowPart = ROUND_UP(DirContext->DirEntry.FatX.FileSize,
DeviceExt->FatInfo.BytesPerCluster);
pInfo->FileAttributes = DirContext->DirEntry.FatX.Attrib & 0x3f;
}
else
{
FsdDosDateTimeToSystemTime(DeviceExt,
DirContext->DirEntry.Fat.CreationDate,
DirContext->DirEntry.Fat.CreationTime,
&pInfo->CreationTime);
FsdDosDateTimeToSystemTime(DeviceExt,
DirContext->DirEntry.Fat.AccessDate,
0,
&pInfo->LastAccessTime);
FsdDosDateTimeToSystemTime(DeviceExt,
DirContext->DirEntry.Fat.UpdateDate,
DirContext->DirEntry.Fat.UpdateTime,
&pInfo->LastWriteTime);
pInfo->ChangeTime = pInfo->LastWriteTime;
pInfo->EndOfFile.u.HighPart = 0;
pInfo->EndOfFile.u.LowPart = DirContext->DirEntry.Fat.FileSize;
/* Make allocsize a rounded up multiple of BytesPerCluster */
pInfo->AllocationSize.u.HighPart = 0;
pInfo->AllocationSize.u.LowPart = ROUND_UP(DirContext->DirEntry.Fat.FileSize,
DeviceExt->FatInfo.BytesPerCluster);
pInfo->FileAttributes = DirContext->DirEntry.Fat.Attrib & 0x3f;
}
}
return Status;
}
static
NTSTATUS
VfatGetFileBothInformation(
PVFAT_DIRENTRY_CONTEXT DirContext,
PDEVICE_EXTENSION DeviceExt,
PFILE_BOTH_DIR_INFORMATION pInfo,
ULONG BufferLength,
PULONG Written,
BOOLEAN First)
{
NTSTATUS Status;
ULONG BytesToCopy = 0;
*Written = 0;
Status = STATUS_BUFFER_OVERFLOW;
if (FIELD_OFFSET(FILE_BOTH_DIR_INFORMATION, FileName) > BufferLength)
return Status;
if (First || (BufferLength > FIELD_OFFSET(FILE_BOTH_DIR_INFORMATION, FileName) + DirContext->LongNameU.Length))
{
pInfo->FileNameLength = DirContext->LongNameU.Length;
pInfo->EaSize = 0;
*Written = FIELD_OFFSET(FILE_BOTH_DIR_INFORMATION, FileName);
pInfo->NextEntryOffset = 0;
if (BufferLength > FIELD_OFFSET(FILE_BOTH_DIR_INFORMATION, FileName))
{
BytesToCopy = min(DirContext->LongNameU.Length, BufferLength - FIELD_OFFSET(FILE_BOTH_DIR_INFORMATION, FileName));
RtlCopyMemory(pInfo->FileName,
DirContext->LongNameU.Buffer,
BytesToCopy);
*Written += BytesToCopy;
if (BytesToCopy == DirContext->LongNameU.Length)
{
pInfo->NextEntryOffset = ULONG_ROUND_UP(sizeof(FILE_BOTH_DIR_INFORMATION) +
BytesToCopy);
Status = STATUS_SUCCESS;
}
}
if (vfatVolumeIsFatX(DeviceExt))
{
pInfo->ShortName[0] = 0;
pInfo->ShortNameLength = 0;
/* pInfo->FileIndex = ; */
FsdDosDateTimeToSystemTime(DeviceExt,
DirContext->DirEntry.FatX.CreationDate,
DirContext->DirEntry.FatX.CreationTime,
&pInfo->CreationTime);
FsdDosDateTimeToSystemTime(DeviceExt,
DirContext->DirEntry.FatX.AccessDate,
DirContext->DirEntry.FatX.AccessTime,
&pInfo->LastAccessTime);
FsdDosDateTimeToSystemTime(DeviceExt,
DirContext->DirEntry.FatX.UpdateDate,
DirContext->DirEntry.FatX.UpdateTime,
&pInfo->LastWriteTime);
pInfo->ChangeTime = pInfo->LastWriteTime;
if (BooleanFlagOn(DirContext->DirEntry.FatX.Attrib, FILE_ATTRIBUTE_DIRECTORY))
{
pInfo->EndOfFile.QuadPart = 0;
pInfo->AllocationSize.QuadPart = 0;
}
else
{
pInfo->EndOfFile.u.HighPart = 0;
pInfo->EndOfFile.u.LowPart = DirContext->DirEntry.FatX.FileSize;
/* Make allocsize a rounded up multiple of BytesPerCluster */
pInfo->AllocationSize.u.HighPart = 0;
pInfo->AllocationSize.u.LowPart = ROUND_UP(DirContext->DirEntry.FatX.FileSize,
DeviceExt->FatInfo.BytesPerCluster);
}
pInfo->FileAttributes = DirContext->DirEntry.FatX.Attrib & 0x3f;
}
else
{
pInfo->ShortNameLength = (CCHAR)DirContext->ShortNameU.Length;
ASSERT(pInfo->ShortNameLength / sizeof(WCHAR) <= 12);
RtlCopyMemory(pInfo->ShortName,
DirContext->ShortNameU.Buffer,
DirContext->ShortNameU.Length);
/* pInfo->FileIndex = ; */
FsdDosDateTimeToSystemTime(DeviceExt,
DirContext->DirEntry.Fat.CreationDate,
DirContext->DirEntry.Fat.CreationTime,
&pInfo->CreationTime);
FsdDosDateTimeToSystemTime(DeviceExt,
DirContext->DirEntry.Fat.AccessDate,
0,
&pInfo->LastAccessTime);
FsdDosDateTimeToSystemTime(DeviceExt,
DirContext->DirEntry.Fat.UpdateDate,
DirContext->DirEntry.Fat.UpdateTime,
&pInfo->LastWriteTime);
pInfo->ChangeTime = pInfo->LastWriteTime;
if (BooleanFlagOn(DirContext->DirEntry.Fat.Attrib, FILE_ATTRIBUTE_DIRECTORY))
{
pInfo->EndOfFile.QuadPart = 0;
pInfo->AllocationSize.QuadPart = 0;
}
else
{
pInfo->EndOfFile.u.HighPart = 0;
pInfo->EndOfFile.u.LowPart = DirContext->DirEntry.Fat.FileSize;
/* Make allocsize a rounded up multiple of BytesPerCluster */
pInfo->AllocationSize.u.HighPart = 0;
pInfo->AllocationSize.u.LowPart = ROUND_UP(DirContext->DirEntry.Fat.FileSize, DeviceExt->FatInfo.BytesPerCluster);
}
pInfo->FileAttributes = DirContext->DirEntry.Fat.Attrib & 0x3f;
}
}
return Status;
}
static
NTSTATUS
DoQuery(
PVFAT_IRP_CONTEXT IrpContext)
{
NTSTATUS Status = STATUS_SUCCESS;
LONG BufferLength = 0;
PUNICODE_STRING pSearchPattern = NULL;
FILE_INFORMATION_CLASS FileInformationClass;
PUCHAR Buffer = NULL;
PFILE_NAMES_INFORMATION Buffer0 = NULL;
PVFATFCB pFcb;
PVFATCCB pCcb;
BOOLEAN FirstQuery = FALSE;
BOOLEAN FirstCall = TRUE;
VFAT_DIRENTRY_CONTEXT DirContext;
WCHAR LongNameBuffer[LONGNAME_MAX_LENGTH + 1];
WCHAR ShortNameBuffer[13];
ULONG Written;
PIO_STACK_LOCATION Stack = IrpContext->Stack;
pCcb = (PVFATCCB)IrpContext->FileObject->FsContext2;
pFcb = (PVFATFCB)IrpContext->FileObject->FsContext;
/* Determine Buffer for result : */
BufferLength = Stack->Parameters.QueryDirectory.Length;
#if 0
/* Do not probe the user buffer until SEH is available */
if (IrpContext->Irp->RequestorMode != KernelMode &&
IrpContext->Irp->MdlAddress == NULL &&
IrpContext->Irp->UserBuffer != NULL)
{
ProbeForWrite(IrpContext->Irp->UserBuffer, BufferLength, 1);
}
#endif
Buffer = VfatGetUserBuffer(IrpContext->Irp, FALSE);
if (!ExAcquireResourceExclusiveLite(&IrpContext->DeviceExt->DirResource,
BooleanFlagOn(IrpContext->Flags, IRPCONTEXT_CANWAIT)))
{
Status = VfatLockUserBuffer(IrpContext->Irp, BufferLength, IoWriteAccess);
if (NT_SUCCESS(Status))
Status = STATUS_PENDING;
return Status;
}
if (!ExAcquireResourceSharedLite(&pFcb->MainResource,
BooleanFlagOn(IrpContext->Flags, IRPCONTEXT_CANWAIT)))
{
ExReleaseResourceLite(&IrpContext->DeviceExt->DirResource);
Status = VfatLockUserBuffer(IrpContext->Irp, BufferLength, IoWriteAccess);
if (NT_SUCCESS(Status))
Status = STATUS_PENDING;
return Status;
}
/* Obtain the callers parameters */
pSearchPattern = (PUNICODE_STRING)Stack->Parameters.QueryDirectory.FileName;
FileInformationClass = Stack->Parameters.QueryDirectory.FileInformationClass;
/* Allocate search pattern in case:
* -> We don't have one already in context
* -> We have been given an input pattern
* -> The pattern length is not null
* -> The pattern buffer is not null
* Otherwise, we'll fall later and allocate a match all (*) pattern
*/
if (pSearchPattern &&
pSearchPattern->Length != 0 && pSearchPattern->Buffer != NULL)
{
if (!pCcb->SearchPattern.Buffer)
{
FirstQuery = TRUE;
pCcb->SearchPattern.MaximumLength = pSearchPattern->Length + sizeof(WCHAR);
pCcb->SearchPattern.Buffer = ExAllocatePoolWithTag(NonPagedPool,
pCcb->SearchPattern.MaximumLength,
TAG_SEARCH);
if (!pCcb->SearchPattern.Buffer)
{
ExReleaseResourceLite(&pFcb->MainResource);
ExReleaseResourceLite(&IrpContext->DeviceExt->DirResource);
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlCopyUnicodeString(&pCcb->SearchPattern, pSearchPattern);
pCcb->SearchPattern.Buffer[pCcb->SearchPattern.Length / sizeof(WCHAR)] = 0;
}
}
else if (!pCcb->SearchPattern.Buffer)
{
FirstQuery = TRUE;
pCcb->SearchPattern.MaximumLength = 2 * sizeof(WCHAR);
pCcb->SearchPattern.Buffer = ExAllocatePoolWithTag(NonPagedPool,
2 * sizeof(WCHAR),
TAG_SEARCH);
if (!pCcb->SearchPattern.Buffer)
{
ExReleaseResourceLite(&pFcb->MainResource);
ExReleaseResourceLite(&IrpContext->DeviceExt->DirResource);
return STATUS_INSUFFICIENT_RESOURCES;
}
pCcb->SearchPattern.Buffer[0] = L'*';
pCcb->SearchPattern.Buffer[1] = 0;
pCcb->SearchPattern.Length = sizeof(WCHAR);
}
if (BooleanFlagOn(IrpContext->Stack->Flags, SL_INDEX_SPECIFIED))
{
DirContext.DirIndex = pCcb->Entry = Stack->Parameters.QueryDirectory.FileIndex;
}
else if (FirstQuery || BooleanFlagOn(IrpContext->Stack->Flags, SL_RESTART_SCAN))
{
DirContext.DirIndex = pCcb->Entry = 0;
}
else
{
DirContext.DirIndex = pCcb->Entry;
}
DPRINT("Buffer=%p tofind=%wZ\n", Buffer, &pCcb->SearchPattern);
DirContext.DeviceExt = IrpContext->DeviceExt;
DirContext.LongNameU.Buffer = LongNameBuffer;
DirContext.LongNameU.MaximumLength = sizeof(LongNameBuffer);
DirContext.ShortNameU.Buffer = ShortNameBuffer;
DirContext.ShortNameU.MaximumLength = sizeof(ShortNameBuffer);
Written = 0;
while ((Status == STATUS_SUCCESS) && (BufferLength > 0))
{
Status = FindFile(IrpContext->DeviceExt,
pFcb,
&pCcb->SearchPattern,
&DirContext,
FirstCall);
pCcb->Entry = DirContext.DirIndex;
DPRINT("Found %wZ, Status=%x, entry %x\n", &DirContext.LongNameU, Status, pCcb->Entry);
FirstCall = FALSE;
if (NT_SUCCESS(Status))
{
switch (FileInformationClass)
{
case FileDirectoryInformation:
Status = VfatGetFileDirectoryInformation(&DirContext,
IrpContext->DeviceExt,
(PFILE_DIRECTORY_INFORMATION)Buffer,
BufferLength,
&Written,
Buffer0 == NULL);
break;
case FileFullDirectoryInformation:
Status = VfatGetFileFullDirectoryInformation(&DirContext,
IrpContext->DeviceExt,
(PFILE_FULL_DIR_INFORMATION)Buffer,
BufferLength,
&Written,
Buffer0 == NULL);
break;
case FileBothDirectoryInformation:
Status = VfatGetFileBothInformation(&DirContext,
IrpContext->DeviceExt,
(PFILE_BOTH_DIR_INFORMATION)Buffer,
BufferLength,
&Written,
Buffer0 == NULL);
break;
case FileNamesInformation:
Status = VfatGetFileNamesInformation(&DirContext,
(PFILE_NAMES_INFORMATION)Buffer,
BufferLength,
&Written,
Buffer0 == NULL);
break;
default:
Status = STATUS_INVALID_INFO_CLASS;
break;
}
if (Status == STATUS_BUFFER_OVERFLOW || Status == STATUS_INVALID_INFO_CLASS)
break;
}
else
{
Status = (FirstQuery ? STATUS_NO_SUCH_FILE : STATUS_NO_MORE_FILES);
break;
}
Buffer0 = (PFILE_NAMES_INFORMATION) Buffer;
Buffer0->FileIndex = DirContext.DirIndex;
pCcb->Entry = ++DirContext.DirIndex;
BufferLength -= Buffer0->NextEntryOffset;
if (BooleanFlagOn(IrpContext->Stack->Flags, SL_RETURN_SINGLE_ENTRY))
break;
Buffer += Buffer0->NextEntryOffset;
}
if (Buffer0)
{
Buffer0->NextEntryOffset = 0;
Status = STATUS_SUCCESS;
IrpContext->Irp->IoStatus.Information = Stack->Parameters.QueryDirectory.Length - BufferLength;
}
else
{
ASSERT(Status != STATUS_SUCCESS || BufferLength == 0);
ASSERT(Written <= Stack->Parameters.QueryDirectory.Length);
IrpContext->Irp->IoStatus.Information = Written;
}
ExReleaseResourceLite(&pFcb->MainResource);
ExReleaseResourceLite(&IrpContext->DeviceExt->DirResource);
return Status;
}
NTSTATUS VfatNotifyChangeDirectory(PVFAT_IRP_CONTEXT IrpContext)
{
PVCB pVcb;
PVFATFCB pFcb;
PIO_STACK_LOCATION Stack;
Stack = IrpContext->Stack;
pVcb = IrpContext->DeviceExt;
pFcb = (PVFATFCB) IrpContext->FileObject->FsContext;
FsRtlNotifyFullChangeDirectory(pVcb->NotifySync,
&(pVcb->NotifyList),
IrpContext->FileObject->FsContext2,
(PSTRING)&(pFcb->PathNameU),
BooleanFlagOn(Stack->Flags, SL_WATCH_TREE),
FALSE,
Stack->Parameters.NotifyDirectory.CompletionFilter,
IrpContext->Irp,
NULL,
NULL);
/* We won't handle IRP completion */
IrpContext->Flags &= ~IRPCONTEXT_COMPLETE;
return STATUS_PENDING;
}
/*
* FUNCTION: directory control : read/write directory informations
*/
NTSTATUS
VfatDirectoryControl(
PVFAT_IRP_CONTEXT IrpContext)
{
NTSTATUS Status = STATUS_SUCCESS;
IrpContext->Irp->IoStatus.Information = 0;
switch (IrpContext->MinorFunction)
{
case IRP_MN_QUERY_DIRECTORY:
Status = DoQuery (IrpContext);
break;
case IRP_MN_NOTIFY_CHANGE_DIRECTORY:
Status = VfatNotifyChangeDirectory(IrpContext);
break;
default:
/* Error */
DPRINT("Unexpected minor function %x in VFAT driver\n",
IrpContext->MinorFunction);
Status = STATUS_INVALID_DEVICE_REQUEST;
break;
}
if (Status == STATUS_PENDING && BooleanFlagOn(IrpContext->Flags, IRPCONTEXT_COMPLETE))
{
return VfatMarkIrpContextForQueue(IrpContext);
}
return Status;
}
/* EOF */
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