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windows-xp/Source/XPSP1/NT/base/fs/srv/persist.c

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/*++
Copyright (c) 1989 Microsoft Corporation
Module Name:
persist.c
Abstract:
This module contains routines for handling the state file for persistent
file handles.
Author:
Andy Herron (andyhe) 17-Nov-1999
Revision History:
--*/
#include "precomp.h"
#include "persist.tmh"
#pragma hdrstop
//
// structures specific to this module only.
//
#ifdef INCLUDE_SMB_PERSISTENT
typedef enum _FLUSH_STATE {
FlushStateNotPosted,
FlushStatePosted,
FlushStateCompleted,
FlushStateInError
} FLUSH_STATE, *PFLUSH_STATE;
typedef struct _PERSISTENT_RECORD_LIST_ENTRY {
LIST_ENTRY PendingListEntry;
ULONG FileOffset;
FLUSH_STATE FlushState;
PWORK_CONTEXT WorkContext;
PERSISTENT_RECORD;
} PERSISTENT_RECORD_LIST_ENTRY, *PPERSISTENT_RECORD_LIST_ENTRY;
#define INITIAL_BITMAP_LENGTH 512
typedef struct _PERSISTENT_SHARE_INFO {
PSHARE Share;
LIST_ENTRY UpdatesPendingList;
UNICODE_STRING StateFileName;
HANDLE FileHandle;
RTL_BITMAP BitMap;
ULONG TotalEntries;
ULONG FreeEntries;
ULONG HintIndex;
ULONG LastIdAccepted;
ULONG LastIdCommitted;
SRV_LOCK Lock;
ULONG FirstRecord;
WCHAR NameBuffer[1];
} PERSISTENT_SHARE_INFO, *PPERSISTENT_SHARE_INFO;
#define BITMAP_TO_STATE_FILE_INDEX( _shareInfo, _index ) \
( (_shareInfo)->FirstRecord + ((_index) * sizeof( PERSISTENT_RECORD )))
PPERSISTENT_RECORD_LIST_ENTRY
SrvGetPersistentRecord (
IN PWORK_CONTEXT WorkContext
);
VOID
SrvFreePersistentRecord (
PPERSISTENT_RECORD_LIST_ENTRY Record
);
NTSTATUS
SrvPostPersistentRecord (
IN PWORK_CONTEXT WorkContext,
IN PPERSISTENT_RECORD_LIST_ENTRY PersistentState,
OUT PULONG TransactionId
);
NTSTATUS
SrvFlushPersistentRecords (
IN PWORK_CONTEXT WorkContext,
IN ULONG TransactionId
);
NTSTATUS
SrvPersistSession(
IN PWORK_CONTEXT WorkContext,
PPERSISTENT_RECORD_LIST_ENTRY PersistentState,
ULONG *SessionId,
ULONG *ClientId
);
NTSTATUS
SrvPersistConnection(
IN PWORK_CONTEXT WorkContext,
PPERSISTENT_RECORD_LIST_ENTRY PersistentState,
ULONG *ClientId
);
unsigned long
Crc32(
IN unsigned long cbBuffer,
IN unsigned char *pbBuffer
);
#if 0
VOID
Crc32( unsigned long dwCrc,
unsigned long cbBuffer,
LPVOID pvBuffer,
unsigned long *pNewCrc);
#endif
#ifdef ALLOC_PRAGMA
#pragma alloc_text( PAGE, SrvPostPersistentOpen )
#pragma alloc_text( PAGE, SrvPersistSession )
#pragma alloc_text( PAGE, SrvPersistConnection )
#pragma alloc_text( PAGE, SrvGetPersistentRecord )
#pragma alloc_text( PAGE, SrvPostPersistentRecord )
#pragma alloc_text( PAGE, SrvFlushPersistentRecords )
#pragma alloc_text( PAGE, SrvSetupPersistentShare )
#pragma alloc_text( PAGE, SrvClosePersistentShare )
#pragma alloc_text( PAGE, Crc32 )
#endif
SMB_STATUS
SrvPostPersistentOpen (
IN OUT PWORK_CONTEXT WorkContext,
IN SMB_STATUS SmbStatus
)
/*++
Routine Description:
Writes an open for the given RFCB to the state file.
Arguments:
WorkContext - has the RFCB
SmbStatus - status that the calling routine wants to pass back to
SrvProcessSmb et al.
Return Value:
Return value to pass back to SrvProcessSmb et al.
--*/
{
PPERSISTENT_RECORD_LIST_ENTRY persistentRecord = NULL;
ULONG clientId;
ULONG sessionId;
NTSTATUS status;
PRFCB rfcb = WorkContext->Rfcb;
PLFCB lfcb = rfcb->Lfcb;
PMFCB mfcb = lfcb->Mfcb;
ULONG transactionId;
PAGED_CODE( );
if (WorkContext->Session == NULL ||
WorkContext->Session->PersistentId == 0 ||
lfcb->TreeConnect->Share->PersistentState == PersistentStateInError) {
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvPostPersistOpen: session 0x%x doesn't support persistent handles.\n", WorkContext->Session ));
}
return SmbStatus;
}
persistentRecord = SrvGetPersistentRecord( WorkContext );
if (persistentRecord == NULL) {
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvPostPersistOpen: Unable to allocate record for 0x%lx\n", WorkContext ));
}
return SmbStatus;
}
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvPostPersistOpen: Post persistent open wc=0x%lx, record 0x%lx\n",
WorkContext, persistentRecord ));
}
status = SrvPersistSession( WorkContext,
persistentRecord,
&sessionId,
&clientId
);
if (!NT_SUCCESS(status)) {
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvPostPersistOpen: failed to persist sess, status 0x%lx\n", status ));
}
SrvFreePersistentRecord( persistentRecord );
return SmbStatus;
}
ASSERT( clientId != 0 );
ASSERT( sessionId != 0 );
ASSERT( rfcb != NULL );
if (rfcb->PagedRfcb->PersistentId == 0) {
ACQUIRE_LOCK( &rfcb->Lfcb->Mfcb->NonpagedMfcb->Lock );
if (rfcb->PagedRfcb->PersistentId == 0) {
LONG uniqueId = 0;
while (uniqueId == 0) {
uniqueId = InterlockedIncrement( &SrvGlobalPersistentRfcbId );
}
rfcb->PagedRfcb->PersistentId = uniqueId;
rfcb->PagedRfcb->PersistentState = PersistentStateActive;
}
RELEASE_LOCK( &rfcb->Lfcb->Mfcb->NonpagedMfcb->Lock );
}
//
// now setup the persistent record as it should exist on disk for this
// file open.
//
persistentRecord->PersistState = PersistentStateActive;
persistentRecord->PersistOperation = PersistentFileOpen;
persistentRecord->FileOpen.ClientId = clientId;
persistentRecord->FileOpen.SessionNumber = sessionId;
persistentRecord->FileOpen.Rfcb = rfcb;
persistentRecord->FileOpen.PersistentFileId = rfcb->PagedRfcb->PersistentId;
persistentRecord->FileOpen.FileMode = lfcb->FileMode;
persistentRecord->FileOpen.JobId = lfcb->JobId;
persistentRecord->FileOpen.FcbOpenCount = rfcb->PagedRfcb->FcbOpenCount;
persistentRecord->FileOpen.Fid = rfcb->Fid;
persistentRecord->FileOpen.Pid = rfcb->Pid;
persistentRecord->FileOpen.Tid = rfcb->Tid;
persistentRecord->FileOpen.GrantedAccess = rfcb->GrantedAccess;
persistentRecord->FileOpen.ShareAccess = rfcb->ShareAccess;
persistentRecord->FileOpen.OplockState = rfcb->OplockState;
persistentRecord->FileOpen.CompatibilityOpen = mfcb->CompatibilityOpen;
persistentRecord->FileOpen.OpenFileAttributes= mfcb->NonpagedMfcb->OpenFileAttributes;
status = SrvIssueQueryUsnInfoRequest( rfcb,
FALSE,
&persistentRecord->FileOpen.UsnValue,
&persistentRecord->FileOpen.FileReferenceNumber );
//
// Save off the current state of the workcontext within the workcontext.
//
WorkContext->Parameters.MakePersistent.ResumeSmbStatus = SmbStatus;
WorkContext->Parameters.MakePersistent.FspRestartRoutine = WorkContext->FspRestartRoutine;
WorkContext->Parameters.MakePersistent.FsdRestartRoutine = WorkContext->FsdRestartRoutine;
WorkContext->FsdRestartRoutine = SrvQueueWorkToFspAtDpcLevel;
// WorkContext->FspRestartRoutine = SrvRestartWritePersistentOpen;
status = SrvPostPersistentRecord( WorkContext,
persistentRecord,
&transactionId
);
if (NT_SUCCESS(status)) {
status = SrvFlushPersistentRecords( WorkContext, transactionId );
if (NT_SUCCESS(status)) {
return SmbStatusInProgress;
} else {
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvPostPersistOpen: failed to flush record, status 0x%lx\n", status ));
}
}
} else {
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvPostPersistOpen: failed to post record, status 0x%lx\n", status ));
}
}
WorkContext->FsdRestartRoutine = WorkContext->Parameters.MakePersistent.FsdRestartRoutine;
WorkContext->FspRestartRoutine = WorkContext->Parameters.MakePersistent.FspRestartRoutine;
// whoops, something didn't go right. clean up.
SrvFreePersistentRecord( persistentRecord );
return SmbStatus;
} // SrvPostPersistentOpen
NTSTATUS
SrvPersistSession(
IN PWORK_CONTEXT WorkContext,
PPERSISTENT_RECORD_LIST_ENTRY PersistentState,
ULONG *SessionId,
ULONG *ClientId
)
{
PPERSISTENT_RECORD_LIST_ENTRY persistentRecord = NULL;
ULONG sessionId;
NTSTATUS status;
PSESSION session = WorkContext->Session;
PCONNECTION connection = WorkContext->Connection;
BOOLEAN createRecord = FALSE;
PAGED_CODE( );
ASSERT(session != NULL);
ASSERT(session->PersistentId != 0);
if (session->PersistentState == PersistentStateFreed) {
ACQUIRE_LOCK( &connection->Lock );
if (session->PersistentState == PersistentStateFreed) {
session->PersistentState = PersistentStateActive;
createRecord = TRUE;
}
RELEASE_LOCK( &connection->Lock );
}
//
// if there's not already a record for this session, create one now
//
if (createRecord) {
persistentRecord = SrvGetPersistentRecord( WorkContext );
if (persistentRecord == NULL) {
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvPersistSession: Unable to allocate record for 0x%lx\n", WorkContext ));
}
status = STATUS_INSUFF_SERVER_RESOURCES;
goto exitPersistSession;
}
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvPersistSession: persistent sess 0x%lx, record 0x%lx\n",
session, persistentRecord ));
}
status = SrvPersistConnection( WorkContext,
PersistentState,
ClientId
);
if (!NT_SUCCESS(status)) {
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvPersistSession: failed to persist conn, status 0x%lx\n", status ));
}
goto exitPersistSession;
}
//
// now setup the persistent record as it should exist on disk for this
// file open.
//
persistentRecord->PersistState = PersistentStateActive;
persistentRecord->PersistOperation = PersistentSession;
persistentRecord->Session.ClientId = *ClientId;
persistentRecord->Session.Session = session;
persistentRecord->Session.SessionNumber = session->PersistentId;
persistentRecord->Session.Uid = session->Uid;
persistentRecord->Session.CreateTime.QuadPart = session->StartTime.QuadPart;
persistentRecord->Session.LogOffTime.QuadPart = session->LogOffTime.QuadPart;
persistentRecord->Session.KickOffTime.QuadPart = session->KickOffTime.QuadPart;
//
// now we add this record onto the list of pending state file updates.
//
InsertTailList( &PersistentState->PendingListEntry,
&persistentRecord->PendingListEntry );
// now it's time to copy the user's name and domain name to the
// entries going out to the state file.
{
ULONG totalLength;
ULONG lengthNameCopiedSoFar = 0;
ULONG lengthCopiedSoFar = 0;
totalLength = session->NtUserName.Length +
session->NtUserDomain.Length +
sizeof(WCHAR) ;
while (lengthCopiedSoFar < totalLength) {
PPERSISTENT_RECORD_LIST_ENTRY persistentName;
ULONG bufferRemaining;
PWCHAR nextAvailable;
persistentName = SrvGetPersistentRecord( WorkContext );
if (persistentName == NULL) {
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvPersistSession: Unable to allocate name record for 0x%lx\n", WorkContext ));
}
status = STATUS_INSUFF_SERVER_RESOURCES;
goto exitPersistSession;
}
persistentName->PersistState = PersistentStateActive;
persistentName->PersistOperation = PersistentUserName;
persistentName->UserName.ContinuationRecord = (ULONG) -1;
persistentName->UserName.RecordLength = totalLength - lengthCopiedSoFar;
if (persistentName->UserName.RecordLength > PERSISTENT_USER_NAME_BUFFER_LENGTH) {
persistentName->UserName.RecordLength = PERSISTENT_USER_NAME_BUFFER_LENGTH;
}
bufferRemaining = persistentName->UserName.RecordLength;
nextAvailable = (WCHAR *) &(persistentName->UserName.Buffer[0]);
//
// first we copy in the user's domain name
//
if (lengthCopiedSoFar < session->NtUserDomain.Length) {
ULONG bytesToCopy = session->NtUserDomain.Length - lengthCopiedSoFar;
if (bytesToCopy > PERSISTENT_USER_NAME_BUFFER_LENGTH) {
bytesToCopy = PERSISTENT_USER_NAME_BUFFER_LENGTH;
}
RtlCopyMemory( nextAvailable,
session->NtUserDomain.Buffer +
( lengthCopiedSoFar / sizeof(WCHAR) ),
bytesToCopy );
nextAvailable += bytesToCopy / sizeof(WCHAR);
bufferRemaining -= bytesToCopy;
lengthCopiedSoFar += bytesToCopy;
}
//
// we separate the domain name and user name with a backslash
//
if (lengthCopiedSoFar == session->NtUserDomain.Length &&
bufferRemaining > 0) {
bufferRemaining -= sizeof(WCHAR);
*nextAvailable = L'\\';
nextAvailable++;
lengthCopiedSoFar += sizeof(WCHAR);
}
//
// lastly we copy in the user's user name
//
if (lengthNameCopiedSoFar < session->NtUserName.Length &&
bufferRemaining > 0) {
ULONG bytesToCopy = session->NtUserName.Length - lengthNameCopiedSoFar;
if (bytesToCopy > PERSISTENT_USER_NAME_BUFFER_LENGTH) {
bytesToCopy = PERSISTENT_USER_NAME_BUFFER_LENGTH;
}
RtlCopyMemory( nextAvailable,
session->NtUserName.Buffer +
( lengthNameCopiedSoFar / sizeof(WCHAR) ),
bytesToCopy );
lengthNameCopiedSoFar += bytesToCopy;
lengthCopiedSoFar += bytesToCopy;
}
InsertTailList( &PersistentState->PendingListEntry,
&persistentName->PendingListEntry );
}
}
}
*SessionId = session->PersistentId;
*ClientId = connection->PagedConnection->PersistentId;
status = STATUS_SUCCESS;
exitPersistSession:
if (status != STATUS_SUCCESS) {
// whoops, something didn't go right. clean up.
*SessionId = 0;
*ClientId = 0;
}
return status;
}
NTSTATUS
SrvPersistConnection(
IN PWORK_CONTEXT WorkContext,
PPERSISTENT_RECORD_LIST_ENTRY PersistentState,
ULONG *ClientId
)
{
PPERSISTENT_RECORD_LIST_ENTRY persistentRecord = NULL;
ULONG clientId;
NTSTATUS status;
PCONNECTION connection = WorkContext->Connection;
BOOLEAN createRecord = FALSE;
PAGED_CODE( );
ASSERT(connection != NULL);
if (connection->PagedConnection->PersistentId == 0) {
ACQUIRE_LOCK( &connection->Lock );
if (connection->PagedConnection->PersistentId == 0) {
LONG uniqueId = 0;
while (uniqueId == 0) {
uniqueId = InterlockedIncrement( &SrvGlobalPersistentSessionId );
}
connection->PagedConnection->PersistentId = uniqueId;
connection->PagedConnection->PersistentState = PersistentStateActive;
createRecord = TRUE;
}
RELEASE_LOCK( &connection->Lock );
}
//
// if there's not already a record for this connection, create one now
//
if (createRecord) {
persistentRecord = SrvGetPersistentRecord( WorkContext );
if (persistentRecord == NULL) {
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvPersistConnection: Unable to allocate record for 0x%lx\n", WorkContext ));
}
status = STATUS_INSUFF_SERVER_RESOURCES;
goto exitPersistConnection;
}
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvPersistConnection: persistent conn 0x%lx, record 0x%lx\n",
connection, persistentRecord ));
}
//
// now setup the persistent record as it should exist on disk for this
// file open.
//
persistentRecord->PersistState = PersistentStateActive;
persistentRecord->PersistOperation = PersistentConnection;
persistentRecord->Connection.ClientId = *ClientId;
persistentRecord->Connection.Connection = connection;
persistentRecord->Connection.DirectHostIpx = connection->DirectHostIpx;
RtlCopyMemory( persistentRecord->Connection.OemClientMachineName,
connection->OemClientMachineName,
COMPUTER_NAME_LENGTH+1
);
if (connection->DirectHostIpx) {
RtlCopyMemory( &persistentRecord->Connection.IpxAddress,
&connection->IpxAddress,
sizeof( TDI_ADDRESS_IPX )
);
} else {
persistentRecord->Connection.ClientIPAddress = connection->ClientIPAddress;
}
InsertTailList( &PersistentState->PendingListEntry,
&persistentRecord->PendingListEntry );
}
*ClientId = connection->PagedConnection->PersistentId;
return STATUS_SUCCESS;
exitPersistConnection:
// whoops, something didn't go right. clean up.
*ClientId = 0;
if (persistentRecord) {
SrvFreePersistentRecord( persistentRecord );
}
return status;
}
PPERSISTENT_RECORD_LIST_ENTRY
SrvGetPersistentRecord (
IN PWORK_CONTEXT WorkContext
)
//
// This allocates persistent state buffers that we write out to the persistent
// state file. Free them with SrvFreePersistentRecord.
//
{
PPERSISTENT_RECORD_LIST_ENTRY record;
PAGED_CODE( );
record = ALLOCATE_HEAP( sizeof( PERSISTENT_RECORD_LIST_ENTRY ), BlockTypePersistentState );
if (record == NULL) {
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvGetPersistentRecord: failed to alloc record for wc= 0x%lx\n", WorkContext ));
}
return NULL;
}
RtlZeroMemory( record, sizeof( PERSISTENT_RECORD_LIST_ENTRY ));
InitializeListHead( &record->PendingListEntry );
record->FileOffset = (ULONG) -1;
record->FlushState = FlushStateNotPosted;
record->WorkContext = WorkContext;
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvGetPersistentRecord: allocated record at 0x%x for wc= 0x%lx\n", record, WorkContext ));
}
return record;
}
VOID
SrvFreePersistentRecord (
PPERSISTENT_RECORD_LIST_ENTRY Record
)
{
PPERSISTENT_RECORD_LIST_ENTRY subRecord;
PLIST_ENTRY listEntry = Record->PendingListEntry.Flink;
PAGED_CODE( );
while (listEntry != &Record->PendingListEntry) {
subRecord = CONTAINING_RECORD( listEntry, PERSISTENT_RECORD_LIST_ENTRY, PendingListEntry );
listEntry = listEntry->Flink;
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvGetPersistentRecord: freed record (1) at 0x%x\n", subRecord ));
}
FREE_HEAP( subRecord );
}
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvGetPersistentRecord: freed record (2) at 0x%x\n", Record ));
}
FREE_HEAP( Record );
return;
}
NTSTATUS
SrvPostPersistentRecord (
IN PWORK_CONTEXT WorkContext,
IN PPERSISTENT_RECORD_LIST_ENTRY PersistentState,
OUT PULONG TransactionId
)
{
PPERSISTENT_RECORD_LIST_ENTRY record;
ULONG numberRecordsRequired = 1;
PLIST_ENTRY listEntry;
PSHARE share = WorkContext->Share;
PPERSISTENT_SHARE_INFO shareInfo;
NTSTATUS status;
ULONG bitMapIndex;
PPERSISTENT_RECORD_LIST_ENTRY firstUserNameRecord = NULL;
PPERSISTENT_RECORD_LIST_ENTRY lastUserNameRecord = NULL;
PPERSISTENT_RECORD_LIST_ENTRY sessionRecord = NULL;
PAGED_CODE( );
if (share == NULL) {
ASSERT(WorkContext->Rfcb != NULL);
share = WorkContext->Rfcb->Lfcb->TreeConnect->Share;
}
ASSERT(share != NULL);
//
// determine how many records we need to write.
//
listEntry = PersistentState->PendingListEntry.Flink;
while (listEntry != &PersistentState->PendingListEntry) {
record = CONTAINING_RECORD( listEntry, PERSISTENT_RECORD_LIST_ENTRY, PendingListEntry );
if (record->FileOffset == (ULONG) -1) {
numberRecordsRequired++;
}
listEntry = listEntry->Flink;
}
//
// if the persistent state file on the share isn't set up, do so now.
//
if (share->PersistentStateFile == NULL) {
status = SrvSetupPersistentShare( share, FALSE );
if (! NT_SUCCESS(status)) {
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvPostPersistentRecord: error 0x%x for share 0x%x\n", status, share ));
}
// need to log an error here
share->PersistentState = PersistentStateInError;
return status;
}
ASSERT( share->PersistentStateFile );
}
shareInfo = (PPERSISTENT_SHARE_INFO) (share->PersistentStateFile);
//
// if the bitmap is too small, try to double it's size.
//
ACQUIRE_LOCK( &shareInfo->Lock );
if (shareInfo->FreeEntries <= numberRecordsRequired) {
PULONG newBuffer;
ULONG newSize;
ULONG newBits;
//
// looks like our bitmap isn't big enough, let's expand it by two
//
if (shareInfo->BitMap.SizeOfBitMap == 0) {
newSize = INITIAL_BITMAP_LENGTH;
} else {
newSize = shareInfo->BitMap.SizeOfBitMap * 2;
}
newBuffer = ALLOCATE_HEAP( newSize, BlockTypePersistentBitMap );
if (newBuffer == NULL) {
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvGetPersistentRecord: failed to alloc record for wc= 0x%lx\n", WorkContext ));
}
RELEASE_LOCK( &shareInfo->Lock );
return STATUS_INSUFF_SERVER_RESOURCES;
}
// optimize by only zeroing the second half of bitmap before copy.
RtlZeroMemory( newBuffer, newSize );
if (shareInfo->BitMap.Buffer != NULL) {
RtlCopyMemory( newBuffer,
shareInfo->BitMap.Buffer,
shareInfo->BitMap.SizeOfBitMap
);
FREE_HEAP( shareInfo->BitMap.Buffer );
newBits = ( newSize - shareInfo->BitMap.SizeOfBitMap ) * 8;
shareInfo->BitMap.Buffer = newBuffer;
shareInfo->BitMap.SizeOfBitMap = newSize;
} else {
newBits = newSize * 8;
RtlInitializeBitMap( &shareInfo->BitMap, newBuffer, newSize );
}
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvGetPersistentRecord: new bitmap 0x%x for share 0x%lx\n",
newBuffer, share ));
}
shareInfo->FreeEntries += newBits;
shareInfo->TotalEntries += newBits;
}
//
// for each record we need to post, find a slot in the bitmap and map it
// to a file index
//
listEntry = &PersistentState->PendingListEntry; // start at the head of the
// list which is on the first entry
while (numberRecordsRequired > 0) {
ULONG numberEntries = numberRecordsRequired;
bitMapIndex = (ULONG) -1;
while (bitMapIndex == (ULONG) -1) {
bitMapIndex = RtlFindClearBitsAndSet( &shareInfo->BitMap,
numberEntries,
shareInfo->HintIndex );
if (bitMapIndex == (ULONG) -1) {
numberEntries = RtlFindLongestRunClear( &shareInfo->BitMap,
&shareInfo->HintIndex );
if (numberEntries == 0 || numberEntries == (ULONG) -1) {
shareInfo->FreeEntries = 0;
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvGetPersistentRecord: bitmap is full for share 0x%lx\n", share ));
}
RELEASE_LOCK( &shareInfo->Lock );
return STATUS_INSUFF_SERVER_RESOURCES;
}
} else {
shareInfo->HintIndex = bitMapIndex;
}
}
numberRecordsRequired -= numberEntries;
while (numberEntries > 0) {
record = CONTAINING_RECORD( listEntry, PERSISTENT_RECORD_LIST_ENTRY, PendingListEntry );
if (record->FileOffset == (ULONG) -1) {
record->FileOffset = BITMAP_TO_STATE_FILE_INDEX( shareInfo, bitMapIndex );
}
record->PersistIndex = record->FileOffset;
//
// track the file indexes in records that need to refer to
// other records.
//
if (record->PersistOperation == PersistentSession) {
sessionRecord = record;
} else if (record->PersistOperation == PersistentUserName) {
//
// chain up the user name records into a list
//
if (firstUserNameRecord == NULL) {
firstUserNameRecord = record;
} else {
lastUserNameRecord->UserName.ContinuationRecord = record->FileOffset;
}
lastUserNameRecord = record;
}
//
// on to next concurrent record, reduce number remaining, etc
//
bitMapIndex++;
numberEntries--;
listEntry = listEntry->Flink;
}
}
//
// fix up the file indexes in records that need to refer to other records
//
if (sessionRecord != NULL) {
sessionRecord->Session.UserNameRecord = (firstUserNameRecord != NULL) ?
firstUserNameRecord->FileOffset : (ULONG) -1;
}
//
// with the records now well formed, complete them by calculating the CRC
// values and putting them on the pending write list for the share.
//
// this is a do..while since we need to be sure to pick up the first record
// which is also the head of the list.
listEntry = &PersistentState->PendingListEntry;
do {
record = CONTAINING_RECORD( listEntry, PERSISTENT_RECORD_LIST_ENTRY, PendingListEntry );
// Warning :
// We calculate the CRC on the rest of the record excluding the CRC
// value itself. If the CRC value is not stored in the first dword,
// this breaks!
//
record->PersistConsistencyCheck = Crc32(
sizeof( PERSISTENT_RECORD_LIST_ENTRY ) - sizeof(ULONG),
(PUCHAR)((PUCHAR)record+sizeof(ULONG)) );
listEntry = listEntry->Flink;
//
// we can add it to the updatesPending list without removing it
// from the linked list it's in because we're destroying the list
// safely as we traverse it.
//
InsertTailList( &shareInfo->UpdatesPendingList,
&record->PendingListEntry );
} while (listEntry != &PersistentState->PendingListEntry);
*TransactionId = ++(shareInfo->LastIdAccepted);
RELEASE_LOCK( &shareInfo->Lock );
return STATUS_SUCCESS;
}
NTSTATUS
SrvFlushPersistentRecords (
IN PWORK_CONTEXT WorkContext,
IN ULONG TransactionId
)
{
return STATUS_INSUFF_SERVER_RESOURCES;
}
NTSTATUS
SrvSetupPersistentShare (
IN OUT PSHARE Share,
IN BOOLEAN Restore
)
{
ULONG bytesRequired;
PPERSISTENT_SHARE_INFO shareInfo;
PWCHAR destString;
HANDLE h;
NTSTATUS status;
OBJECT_ATTRIBUTES objectAttributes;
IO_STATUS_BLOCK iosb;
LARGE_INTEGER allocationSize;
PAGED_CODE( );
ACQUIRE_LOCK( &SrvShareLock );
if ( ! Share->AllowPersistentHandles ) {
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvSetupPersistentShare: share %ws not configured for persistent handles\n", Share->ShareName.Buffer ));
}
RELEASE_LOCK( &SrvShareLock );
return STATUS_INVALID_SERVER_STATE;
}
if ( Share->PersistentStateFile != NULL ) {
RELEASE_LOCK( &SrvShareLock );
return STATUS_SUCCESS;
}
bytesRequired = sizeof( PERSISTENT_SHARE_INFO ) + sizeof( WCHAR ) +
Share->NtPathName.Length + sizeof( WCHAR ) +
Share->ShareName.Length + sizeof( WCHAR );
shareInfo = ALLOCATE_HEAP( bytesRequired, BlockTypePersistShareState );
if (shareInfo == NULL) {
IF_DEBUG(PERSISTENT) {
KdPrint(( "SrvSetupPersistentShare: failed to alloc block for share %ws\n", Share->ShareName.Buffer ));
}
RELEASE_LOCK( &SrvShareLock );
return STATUS_INSUFF_SERVER_RESOURCES;
}
RtlZeroMemory( shareInfo, bytesRequired );
shareInfo->Share = Share;
InitializeListHead( &shareInfo->UpdatesPendingList );
shareInfo->LastIdAccepted = 1;
shareInfo->LastIdCommitted = 1;
shareInfo->FirstRecord = sizeof( PERSISTENT_FILE_HEADER );
INITIALIZE_LOCK( &shareInfo->Lock, SHARE_LOCK_LEVEL, "PersistentShareLock" );
destString = &shareInfo->NameBuffer[0];
RtlCopyMemory( destString,
Share->NtPathName.Buffer,
Share->NtPathName.Length
);
destString += (Share->NtPathName.Length / sizeof(WCHAR));
*destString = L':'; // form up stream name
destString++;
*destString = L'$';
destString++;
RtlCopyMemory( destString,
Share->ShareName.Buffer,
Share->ShareName.Length
);
destString += (Share->ShareName.Length / sizeof(WCHAR));
*destString = L'\0';
RtlInitUnicodeString( &shareInfo->StateFileName,
&shareInfo->NameBuffer[0] );
Share->PersistentStateFile = shareInfo;
Share->PersistentState = PersistentStateActive;
RELEASE_LOCK( &SrvShareLock );
SrvInitializeObjectAttributes_U(
&objectAttributes,
&shareInfo->StateFileName,
OBJ_CASE_INSENSITIVE,
NULL,
NULL
);
allocationSize.QuadPart = shareInfo->FirstRecord +
( INITIAL_BITMAP_LENGTH * sizeof( PERSISTENT_RECORD ) );
status = IoCreateFile( &h,
GENERIC_READ | GENERIC_WRITE,
&objectAttributes,
&iosb,
&allocationSize,
0,
0, // no sharing for this file
FILE_OPEN_IF,
FILE_NO_COMPRESSION,
NULL,
0,
CreateFileTypeNone,
NULL,
0 );
if ( NT_SUCCESS( status ) ) {
status = iosb.Status;
}
if ( NT_SUCCESS( status ) ) {
shareInfo->FileHandle = h;
if (Restore) {
// restore settings from file here.
}
// write out the header record
} else {
//
// the create failed. hmmm. looks like we can't support persistent
// handles on this share.
//
Share->PersistentState = PersistentStateInError;
}
return status;
}
NTSTATUS
SrvClosePersistentShare (
IN OUT PSHARE Share,
IN BOOLEAN ClearState
)
{
PAGED_CODE( );
return 0;
}
//
// This code comes from Dr. Dobbs Journal, May 1992
//
unsigned long SrvCRCTable[256] = {
0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F,
0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2,
0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9,
0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C,
0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423,
0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106,
0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D,
0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950,
0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7,
0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA,
0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81,
0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84,
0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB,
0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E,
0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55,
0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28,
0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F,
0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242,
0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69,
0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC,
0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693,
0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D };
//
// Since we never need to have a "rolling crc" across records, we have
// simplified the crc routine abit by always assuming the starting CRC is
// -1 and we return the crc value rather than stuff it into passed arguement.
//
unsigned long
Crc32(
IN unsigned long cbBuffer,
IN unsigned char *pbBuffer
)
{
unsigned long dwCrc = (unsigned long) -1;
PAGED_CODE( );
while (cbBuffer-- != 0)
{
dwCrc = (dwCrc >> 8) ^ SrvCRCTable[(unsigned char) dwCrc ^ *pbBuffer++];
}
return dwCrc;
}
#if 0
// here's the original, in case anyone needs to refer to it.
VOID
Crc32( unsigned long dwCrc,
unsigned long cbBuffer,
LPVOID pvBuffer,
unsigned long *pNewCrc)
{
unsigned char * pbBuffer = (unsigned char *) pvBuffer;
while (cbBuffer-- != 0)
{
dwCrc = (dwCrc >> 8) ^ SrvCRCTable[(unsigned char) dwCrc ^ *pbBuffer++];
}
*pNewCrc = dwCrc;
}
#endif
#endif // def INCLUDE_SMB_PERSISTENT