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[NTOS]

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- Greatly simplify and fix the incorrect and overcomplicated if condition in IoIsOperationSynchronous(), based on MSDN description. Bug spotted, fix tested by Pierre.

svn path=/trunk/; revision=50210
This commit is contained in:
Aleksey Bragin 2010-12-29 11:12:17 +00:00
parent 6c87e66f80
commit 0834418ad7
1 changed files with 14 additions and 5 deletions
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19
reactos/ntoskrnl/io/iomgr/irp.c
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@ -1704,12 +1704,21 @@ BOOLEAN
NTAPI
IoIsOperationSynchronous(IN PIRP Irp)
{
BOOLEAN SynchIO;
BOOLEAN ForceAsync;
/* If the IRP requests synchronous paging I/O, if the file object was opened
for synchronous I/O, if the IRP_SYNCHRONOUS_API flag is set in the IRP
the operation is synchronous */
SynchIO = (IoGetCurrentIrpStackLocation(Irp)->FileObject->Flags & FO_SYNCHRONOUS_IO) ||
(Irp->Flags & IRP_SYNCHRONOUS_API) || (Irp->Flags & IRP_SYNCHRONOUS_PAGING_IO);
/* If the IRP requests asynchronous paging I/O, the operation is asynchronous,
even if one of the above conditions is true */
ForceAsync = (Irp->Flags & IRP_PAGING_IO) && !(Irp->Flags & IRP_SYNCHRONOUS_PAGING_IO);
/* Check the flags */
if (!(Irp->Flags & (IRP_PAGING_IO | IRP_SYNCHRONOUS_PAGING_IO)) &&
((Irp->Flags & IRP_SYNCHRONOUS_PAGING_IO) ||
(Irp->Flags & IRP_SYNCHRONOUS_API) ||
(IoGetCurrentIrpStackLocation(Irp)->FileObject->Flags &
FO_SYNCHRONOUS_IO)))
if (SynchIO && !ForceAsync)
{
/* Synch API or Paging I/O is OK, as is Sync File I/O */
return TRUE;