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sys: fileinfo: oplocks

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This commit is contained in:
Bill Zissimopoulos
2016-11-13 10:45:24 -08:00
parent 764b772731
commit f49cf412a8
1 changed files with 90 additions and 1 deletions
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91
src/sys/fileinfo.c
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@@ -1050,10 +1050,36 @@ static NTSTATUS FspFsvolSetDispositionInformation(
/* cannot delete root directory */
return STATUS_CANNOT_DELETE;
retry:
FspFileNodeAcquireExclusive(FileNode, Full);
if (Info->DeleteFile)
{
/*
* Perform oplock check.
*
* It is ok to block our thread during receipt of the SetInformation IRP.
* However we cannot acquire the FileNode exclusive and wait for oplock
* breaks to complete, because oplock break processing acquires the FileNode
* shared.
*
* Instead we initiate the oplock breaks and then check if any are in progress.
* If that is the case we release the FileNode and wait for the oplock breaks
* to complete. Once they are complete we retry the whole thing.
*/
Result = FspCheckOplockEx(FspFileNodeAddrOfOplock(FileNode), Irp,
OPLOCK_FLAG_COMPLETE_IF_OPLOCKED, 0, 0, 0);
if (STATUS_OPLOCK_BREAK_IN_PROGRESS == Result)
{
FspFileNodeRelease(FileNode, Full);
Result = FspCheckOplock(FspFileNodeAddrOfOplock(FileNode), Irp, 0, 0, 0);
if (!NT_SUCCESS(Result))
return Result;
goto retry;
}
if (!NT_SUCCESS(Result))
goto unlock_exit;
/* make sure no process is mapping the file as an image */
Success = MmFlushImageSection(FileObject->SectionObjectPointer, MmFlushForDelete);
if (!Success)
@@ -1159,9 +1185,36 @@ static NTSTATUS FspFsvolSetRenameInformation(
ASSERT(TargetFileNode->IsDirectory);
}
retry:
FspFsvolDeviceFileRenameAcquireExclusive(FsvolDeviceObject);
FspFileNodeAcquireExclusive(FileNode, Full);
/*
* Perform oplock check.
*
* It is ok to block our thread during receipt of the SetInformation IRP.
* However we cannot acquire the FileNode exclusive and wait for oplock
* breaks to complete, because oplock break processing acquires the FileNode
* shared.
*
* Instead we initiate the oplock breaks and then check if any are in progress.
* If that is the case we release the FileNode and wait for the oplock breaks
* to complete. Once they are complete we retry the whole thing.
*/
Result = FspCheckOplockEx(FspFileNodeAddrOfOplock(FileNode), Irp,
OPLOCK_FLAG_COMPLETE_IF_OPLOCKED, 0, 0, 0);
if (STATUS_OPLOCK_BREAK_IN_PROGRESS == Result)
{
FspFileNodeRelease(FileNode, Full);
FspFsvolDeviceFileRenameRelease(FsvolDeviceObject);
Result = FspCheckOplock(FspFileNodeAddrOfOplock(FileNode), Irp, 0, 0, 0);
if (!NT_SUCCESS(Result))
return Result;
goto retry;
}
if (!NT_SUCCESS(Result))
goto unlock_exit;
if (0 != TargetFileNode)
Remain = TargetFileNode->FileName;
else
@@ -1355,16 +1408,52 @@ static NTSTATUS FspFsvolSetInformation(
ASSERT(FileNode == FileDesc->FileNode);
FspFileNodeAcquireExclusive(FileNode, Full);
if (FileAllocationInformation == FileInformationClass ||
FileEndOfFileInformation == FileInformationClass)
{
/*
* Perform oplock check.
*
* It is ok to block our thread during receipt of the SetInformation IRP.
* However we cannot acquire the FileNode exclusive and wait for oplock
* breaks to complete, because oplock break processing acquires the FileNode
* shared.
*
* Instead we initiate the oplock breaks and then check if any are in progress.
* If that is the case we release the FileNode and wait for the oplock breaks
* to complete. Once they are complete we retry the whole thing.
*/
Result = FspCheckOplockEx(FspFileNodeAddrOfOplock(FileNode), Irp,
OPLOCK_FLAG_COMPLETE_IF_OPLOCKED, 0, 0, 0);
if (STATUS_OPLOCK_BREAK_IN_PROGRESS == Result)
{
FspFileNodeRelease(FileNode, Full);
Result = FspCheckOplock(FspFileNodeAddrOfOplock(FileNode), Irp, 0, 0, 0);
if (!NT_SUCCESS(Result))
return Result;
goto retry;
}
if (!NT_SUCCESS(Result))
{
FspFileNodeRelease(FileNode, Full);
return Result;
}
}
Result = FspIopCreateRequestEx(Irp, 0, 0, FspFsvolSetInformationRequestFini, &Request);
if (!NT_SUCCESS(Result))
{
FspFileNodeRelease(FileNode, Full);
return Result;
}
Request->Kind = FspFsctlTransactSetInformationKind;
Request->Req.SetInformation.UserContext = FileNode->UserContext;
Request->Req.SetInformation.UserContext2 = FileDesc->UserContext2;
Request->Req.SetInformation.FileInformationClass = FileInformationClass;
FspFileNodeAcquireExclusive(FileNode, Full);
FspFileNodeSetOwner(FileNode, Full, Request);
FspIopRequestContext(Request, RequestFileNode) = FileNode;