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[NTOSKRNL] Use faster internal helper to query name

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This only applies if we're called from kernel mode
with a synchronous file.
This commit is contained in:
Pierre Schweitzer 2018-10-03 10:21:39 +02:00
parent 1348f62f20
commit a1401a7577
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GPG key ID: 7545556C3D585B0B
2 changed files with 27 additions and 5 deletions
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10
ntoskrnl/include/internal/io.h
View file

@ -1276,6 +1276,16 @@ IoComputeDesiredAccessFileObject(
IN PACCESS_MASK DesiredAccess
);
NTSTATUS
NTAPI
IopGetFileInformation(
IN PFILE_OBJECT FileObject,
IN ULONG Length,
IN FILE_INFORMATION_CLASS FileInfoClass,
OUT PVOID Buffer,
OUT PULONG ReturnedLength
);
//
// I/O Timer Routines
//

22
ntoskrnl/io/iomgr/file.c
View file

@ -1941,11 +1941,23 @@ IopQueryNameInternal(IN PVOID ObjectBody,
FIELD_OFFSET(FILE_NAME_INFORMATION, FileName);
/* Query the File name */
Status = IoQueryFileInformation(FileObject,
FileNameInformation,
LengthMismatch ? Length : FileLength,
LocalFileInfo,
&LocalReturnLength);
if (PreviousMode == KernelMode &&
BooleanFlagOn(FileObject->Flags, FO_SYNCHRONOUS_IO))
{
Status = IopGetFileInformation(FileObject,
LengthMismatch ? Length : FileLength,
FileNameInformation,
LocalFileInfo,
&LocalReturnLength);
}
else
{
Status = IoQueryFileInformation(FileObject,
FileNameInformation,
LengthMismatch ? Length : FileLength,
LocalFileInfo,
&LocalReturnLength);
}
if (NT_ERROR(Status))
{
/* Fail on errors only, allow warnings */