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2410 lines
67 KiB
2410 lines
67 KiB
/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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pagefile.c
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Abstract:
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Session manager page file creation routines.
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Author:
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Silviu Calinoiu (silviuc) 12-Apr-2001
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Revision History:
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--*/
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#include "smsrvp.h"
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#include <ntosp.h> // Only for the interlocked functions.
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#include "pagefile.h"
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//
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// issue: silviuc: DbgPrintEx calls active on free builds (controlled by kd_smss_mask)
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// We want to do this temporarily for easy debugging in case there are issues.
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//
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#ifdef KdPrintEx
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#undef KdPrintEx
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#define KdPrintEx(_x_) DbgPrintEx _x_
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#endif
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//
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// Debugging aids. Since smss is very difficult to debug (cannot attach
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// a user mode debugger we need to leave some traces to understand
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// postmortem from kernel debugger what went wrong.
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//
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#define DEBUG_LOG_SIZE 32
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typedef struct _DEBUG_LOG_ENTRY {
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ULONG Line;
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NTSTATUS Status;
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PCHAR Description;
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PVOID Context;
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} DEBUG_LOG_ENTRY;
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DEBUG_LOG_ENTRY DebugLog [DEBUG_LOG_SIZE];
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LONG DebugLogIndex;
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#define DEBUG_LOG_EVENT(_Status, _Message, _Context) { \
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\
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LONG I = InterlockedIncrement (&DebugLogIndex); \
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I %= DEBUG_LOG_SIZE; \
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DebugLog[I].Line = __LINE__; \
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DebugLog[I].Status = _Status; \
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DebugLog[I].Description = _Message; \
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DebugLog[I].Context = (PVOID)_Context; \
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}
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//
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// Internal functions
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//
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VOID
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SmpMakeSystemManagedPagingFileDescriptor (
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IN OUT PPAGING_FILE_DESCRIPTOR Descriptor
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);
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VOID
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SmpMakeDefaultPagingFileDescriptor (
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IN OUT PPAGING_FILE_DESCRIPTOR Descriptor
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);
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PVOLUME_DESCRIPTOR
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SmpSearchVolumeDescriptor (
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WCHAR DriveLetter
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);
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NTSTATUS
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SmpValidatePagingFileSizes(
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IN PPAGING_FILE_DESCRIPTOR Descriptor
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);
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NTSTATUS
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SmpCreatePagingFileOnAnyDrive(
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IN OUT PPAGING_FILE_DESCRIPTOR Descriptor,
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IN PLARGE_INTEGER SizeDelta,
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IN PLARGE_INTEGER MinimumSize
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);
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NTSTATUS
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SmpCreatePagingFileOnFixedDrive(
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IN OUT PPAGING_FILE_DESCRIPTOR Descriptor,
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IN PLARGE_INTEGER SizeDelta,
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IN PLARGE_INTEGER MinimumSize
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);
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NTSTATUS
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SmpCreateSystemManagedPagingFile (
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PPAGING_FILE_DESCRIPTOR Descriptor,
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BOOLEAN DecreaseSize
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);
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NTSTATUS
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SmpCreateEmergencyPagingFile (
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VOID
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);
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BOOLEAN
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SmpIsPossiblePagingFile (
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POBJECT_ATTRIBUTES ObjectAttributes,
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PUNICODE_STRING PageFileName
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);
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NTSTATUS
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SmpGetPagingFileSize (
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PUNICODE_STRING PageFileName,
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PLARGE_INTEGER PageFileSize
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);
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NTSTATUS
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SmpGetVolumeFreeSpace (
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PVOLUME_DESCRIPTOR Volume
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);
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NTSTATUS
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SmpDeleteStalePagingFiles (
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VOID
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);
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NTSTATUS
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SmpDeletePagingFile (
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PUNICODE_STRING PageFileName
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);
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//
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// Standard page file name.
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//
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#define STANDARD_PAGING_FILE_NAME L"\\??\\?:\\pagefile.sys"
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#define STANDARD_DRIVE_LETTER_OFFSET 4
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//
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// Maximum number of possible paging files. Limit comes from kernel.
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//
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#define MAXIMUM_NUMBER_OF_PAGING_FILES 16
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//
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// Minimum free space on disk. Used to avoid a situation where
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// a paging file uses the entire disk space.
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//
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#define MINIMUM_REQUIRED_FREE_SPACE_ON_DISK (32 * 0x100000)
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//
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// Paging file creation retry constants.
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//
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#define MINIMUM_PAGING_FILE_SIZE (16 * 0x100000)
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#define PAGING_FILE_SIZE_DELTA (16 * 0x100000)
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//
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// Paging file attributes
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//
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#define PAGING_FILE_ATTRIBUTES (FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM)
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//
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// Volume descriptors
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//
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LIST_ENTRY SmpVolumeDescriptorList;
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//
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// Paging file descriptors
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//
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ULONG SmpNumberOfPagingFiles;
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LIST_ENTRY SmpPagingFileDescriptorList;
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//
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// True if there was at least one paging file registry
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// specifier even if it was ill-formed and it did not
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// end up as a paging file descriptor.
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//
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BOOLEAN SmpRegistrySpecifierPresent;
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//
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// Exception information in case something was raised.
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//
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ULONG SmpPagingExceptionCode;
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PVOID SmpPagingExceptionRecord;
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/////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////
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VOID
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SmpPagingFileInitialize (
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VOID
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)
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{
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InitializeListHead (&SmpPagingFileDescriptorList);
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InitializeListHead (&SmpVolumeDescriptorList);
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}
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NTSTATUS
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SmpCreatePagingFileDescriptor(
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IN PUNICODE_STRING PagingFileSpecifier
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)
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/*++
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Routine Description:
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This function is called during configuration to add a paging file
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to the structures describing pagefiles. Later SmpCreatePagingFiles
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will create the paging files based on these descriptions.
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The format of PagingFileSpec is:
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NAME MIN_SIZE MAX_SIZE (sizes specified in Mb)
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NAME (system managed paging file)
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NAME 0 0 (system managed paging file)
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If an error is encountered while converting the string to min/max size
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the registry specifier will be ignored.
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If the specifier is a duplicate (a `?:\' specifier already present
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it will be ignored.
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Arguments:
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PagingFileSpecifier - Unicode string that specifies the paging file name
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and size. The string is allocated during registry read and is assumed
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that this function takes ownership of it (w.r.t. freeing etc.).
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Return Value:
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Status of operation
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--*/
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{
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NTSTATUS Status;
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UNICODE_STRING PagingFileName;
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UNICODE_STRING Arguments;
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ULONG MinSize;
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ULONG MaxSize;
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PWSTR ArgSave, Arg2;
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USHORT I;
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BOOLEAN SystemManaged;
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BOOLEAN ZeroSizesSpecified;
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PPAGING_FILE_DESCRIPTOR Descriptor;
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//
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// Limit the number of registry specifiers.
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//
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if (SmpNumberOfPagingFiles >= MAXIMUM_NUMBER_OF_PAGING_FILES) {
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KdPrintEx ((DPFLTR_SMSS_ID,
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DPFLTR_INFO_LEVEL,
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"SMSS:PFILE: Too many paging files specified - %d\n",
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SmpNumberOfPagingFiles));
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return STATUS_TOO_MANY_PAGING_FILES;
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}
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//
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// Parse the pagefile specification into file name
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// and a string with the min and max size (e.g. "min max").
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// Necessary buffers for PagingFileName and Arguments are
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// allocated in the parsing routine.
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//
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KdPrintEx ((DPFLTR_SMSS_ID,
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DPFLTR_INFO_LEVEL,
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"SMSS:PFILE: Paging file specifier `%wZ' \n",
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PagingFileSpecifier));
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Status = SmpParseCommandLine (PagingFileSpecifier,
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NULL,
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&PagingFileName,
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NULL,
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&Arguments);
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if (! NT_SUCCESS(Status)) {
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DEBUG_LOG_EVENT (Status,
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"parsing specified failed",
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PagingFileSpecifier);
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KdPrintEx ((DPFLTR_SMSS_ID,
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DPFLTR_INFO_LEVEL,
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"SMSS:PFILE: SmpParseCommandLine(%wZ) failed with status %X \n",
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PagingFileSpecifier,
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Status));
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return Status;
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}
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//
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// We have encountered at least one registry specifier so far.
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// This is the right place to initialize this to true because if
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// we want no paging file at all the command above will fail and return
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// and will leave this variable false. If it is false we will not
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// attempt to create an emergency paging file.
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//
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SmpRegistrySpecifierPresent = TRUE;
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//
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// Convert the string sizes into integers representing pagefile
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// size in Mb. If the `Arguments' string is null or has "0 0" as sizes
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// it means we need to create a pagefile using the RAM size.
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//
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MinSize = 0;
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MaxSize = 0;
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SystemManaged = FALSE;
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ZeroSizesSpecified = FALSE;
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if (Arguments.Buffer) {
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//
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// If we picked up some numbers in the Arguments buffer check out
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// if there are only space and strings there.
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//
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ZeroSizesSpecified = TRUE;
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for (I = 0; I < Arguments.Length / sizeof(WCHAR); I += 1) {
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if (Arguments.Buffer[I] != L' ' &&
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Arguments.Buffer[I] != L'\t' &&
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Arguments.Buffer[I] != L'0') {
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ZeroSizesSpecified = FALSE;
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break;
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}
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}
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}
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if (Arguments.Buffer == NULL || ZeroSizesSpecified) {
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SystemManaged = TRUE;
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}
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else {
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//
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// We need to read two decimal numbers from the Arguments string.
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// If we encounter any errors while converting the string to a number
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// we will skip the entire specifier.
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//
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Status = RtlUnicodeStringToInteger (&Arguments, 0, &MinSize);
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if (! NT_SUCCESS(Status)) {
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DEBUG_LOG_EVENT (Status, NULL, NULL);
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RtlFreeUnicodeString (&PagingFileName);
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RtlFreeUnicodeString (&Arguments);
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return Status;
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}
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else {
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ArgSave = Arguments.Buffer;
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Arg2 = ArgSave;
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while (*Arg2 != UNICODE_NULL) {
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if (*Arg2++ == L' ') {
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Arguments.Length -= (USHORT)((PCHAR)Arg2 - (PCHAR)ArgSave);
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Arguments.Buffer = Arg2;
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Status = RtlUnicodeStringToInteger (&Arguments, 0, &MaxSize);
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if (! NT_SUCCESS (Status)) {
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DEBUG_LOG_EVENT (Status, NULL, NULL);
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RtlFreeUnicodeString (&PagingFileName);
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RtlFreeUnicodeString (&Arguments);
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return Status;
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}
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Arguments.Buffer = ArgSave;
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break;
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}
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}
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}
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}
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//
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// We do not need the temporary buffer created by the parsing routine
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// anymore.
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//
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RtlFreeUnicodeString (&Arguments);
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//
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// Save name and values just parsed into a pagefile descriptor
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// structure and return. We do not perform any validation on the
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// size here because all this will happen when the paging file
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// gets created.
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//
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Descriptor = (PPAGING_FILE_DESCRIPTOR) RtlAllocateHeap (RtlProcessHeap(),
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HEAP_ZERO_MEMORY,
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sizeof *Descriptor);
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if (Descriptor == NULL) {
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RtlFreeUnicodeString (&PagingFileName);
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return STATUS_NO_MEMORY;
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}
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Descriptor->Specifier = *PagingFileSpecifier;
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Descriptor->Name = PagingFileName;
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Descriptor->MinSize.QuadPart = (LONGLONG)MinSize * 0x100000;
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Descriptor->MaxSize.QuadPart = (LONGLONG)MaxSize * 0x100000;
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Descriptor->SystemManaged = SystemManaged;
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Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET] =
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RtlUpcaseUnicodeChar (Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET]);
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if (Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET] == L'?') {
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Descriptor->AnyDrive = 1;
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}
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//
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// Avoid adding a duplicate to the descriptor list.
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//
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{
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PLIST_ENTRY Current;
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PPAGING_FILE_DESCRIPTOR FileDescriptor;
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BOOLEAN SkipDescriptor;
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Current = SmpPagingFileDescriptorList.Flink;
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SkipDescriptor = FALSE;
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while (Current != &SmpPagingFileDescriptorList) {
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FileDescriptor = CONTAINING_RECORD (Current,
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PAGING_FILE_DESCRIPTOR,
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List);
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Current = Current->Flink;
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//
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// Only one `?:\' descriptor is allowed. All others are skipped.
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//
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if (FileDescriptor->AnyDrive && Descriptor->AnyDrive) {
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SkipDescriptor = TRUE;
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break;
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}
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//
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// We allow descriptors on same volume.
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//
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#if 0
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if (FileDescriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET] ==
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Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET]) {
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SkipDescriptor = TRUE;
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break;
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}
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#endif
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}
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if (SkipDescriptor) {
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KdPrintEx ((DPFLTR_SMSS_ID,
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DPFLTR_INFO_LEVEL,
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"SMSS:PFILE: Skipping duplicate specifier `%wZ' \n",
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PagingFileSpecifier));
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RtlFreeUnicodeString (&PagingFileName);
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RtlFreeHeap (RtlProcessHeap(), 0, Descriptor);
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return STATUS_INVALID_PARAMETER;
|
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}
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}
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|
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//
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// Finally add new descriptor to the list.
|
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//
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InsertTailList (&SmpPagingFileDescriptorList, &(Descriptor->List));
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SmpNumberOfPagingFiles += 1;
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|
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KdPrintEx ((DPFLTR_SMSS_ID,
|
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DPFLTR_INFO_LEVEL,
|
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"SMSS:PFILE: Created descriptor for `%wZ' (`%wZ') \n",
|
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PagingFileSpecifier,
|
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&(Descriptor->Name)));
|
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|
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return STATUS_SUCCESS;
|
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}
|
|
|
|
/////////////////////////////////////////////////////////////////////
|
|
/////////////////////////////////////////////////////////////////////
|
|
/////////////////////////////////////////////////////////////////////
|
|
|
|
NTSTATUS
|
|
SmpCreateVolumeDescriptors (
|
|
VOID
|
|
)
|
|
/*++
|
|
|
|
Routine description:
|
|
|
|
This routine iterates all drive letters and creates a small descriptor for
|
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each volume that can host a page file (not a floppy, not removable and not
|
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remote volume). In each descriptor we store the free space available which is
|
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used to compute the volume with largest amount of free space.
|
|
|
|
Parameters:
|
|
|
|
None.
|
|
|
|
Return value:
|
|
|
|
STATUS_SUCCESS if it managed to find and query at least one volume.
|
|
STATUS_UNEXPECTED_IO_ERROR if no volume was found and queried.
|
|
|
|
--*/
|
|
{
|
|
WCHAR Drive;
|
|
WCHAR StartDrive;
|
|
NTSTATUS Status;
|
|
UNICODE_STRING VolumePath;
|
|
WCHAR Buffer[8];
|
|
OBJECT_ATTRIBUTES ObjectAttributes;
|
|
HANDLE VolumeHandle;
|
|
PVOLUME_DESCRIPTOR Volume;
|
|
IO_STATUS_BLOCK IoStatusBlock;
|
|
FILE_FS_SIZE_INFORMATION SizeInfo;
|
|
FILE_FS_DEVICE_INFORMATION DeviceInfo;
|
|
PROCESS_DEVICEMAP_INFORMATION ProcessDeviceMapInfo;
|
|
BOOLEAN BootVolumeFound;
|
|
|
|
//
|
|
// Make sure we start with an empty list of volume descriptors.
|
|
//
|
|
|
|
ASSERT (IsListEmpty (&SmpVolumeDescriptorList));
|
|
|
|
//
|
|
// Query ProcessDeviceMap. We are interested in the DriveMap
|
|
// bitmap so that we can figure out what drive letters are
|
|
// legal.
|
|
//
|
|
|
|
Status = NtQueryInformationProcess (NtCurrentProcess(),
|
|
ProcessDeviceMap,
|
|
&ProcessDeviceMapInfo.Query,
|
|
sizeof(ProcessDeviceMapInfo.Query),
|
|
NULL);
|
|
|
|
if (! NT_SUCCESS(Status)) {
|
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|
|
DEBUG_LOG_EVENT (Status, NULL, NULL);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Query(ProcessDeviceMap) failed with status %X \n",
|
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Status));
|
|
|
|
return Status;
|
|
}
|
|
|
|
//
|
|
// Create a template volume path.
|
|
//
|
|
|
|
wcscpy (Buffer, L"\\??\\A:\\");
|
|
VolumePath.Buffer = Buffer;
|
|
VolumePath.Length = wcslen(VolumePath.Buffer) * sizeof(WCHAR);
|
|
VolumePath.MaximumLength = VolumePath.Length + sizeof(WCHAR);
|
|
|
|
//
|
|
// The first possible drive letter.
|
|
//
|
|
|
|
StartDrive = L'C';
|
|
|
|
#if defined(i386)
|
|
//
|
|
// PC-9800 Series support.
|
|
//
|
|
|
|
if (IsNEC_98) {
|
|
StartDrive = L'A';
|
|
}
|
|
#endif // defined(i386)
|
|
|
|
//
|
|
// Iterate all possible drive letters.
|
|
//
|
|
|
|
BootVolumeFound = FALSE;
|
|
|
|
for (Drive = StartDrive; Drive <= L'Z'; Drive += 1) {
|
|
|
|
//
|
|
// Skip invalid drive letters.
|
|
//
|
|
|
|
if ((ProcessDeviceMapInfo.Query.DriveMap & (1 << (Drive - L'A'))) == 0) {
|
|
continue;
|
|
}
|
|
|
|
VolumePath.Buffer[STANDARD_DRIVE_LETTER_OFFSET] = Drive;
|
|
|
|
InitializeObjectAttributes (&ObjectAttributes,
|
|
&VolumePath,
|
|
OBJ_CASE_INSENSITIVE,
|
|
NULL,
|
|
NULL);
|
|
|
|
Status = NtOpenFile (&VolumeHandle,
|
|
(ACCESS_MASK)FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES | SYNCHRONIZE,
|
|
&ObjectAttributes,
|
|
&IoStatusBlock,
|
|
FILE_SHARE_READ | FILE_SHARE_WRITE,
|
|
FILE_SYNCHRONOUS_IO_NONALERT | FILE_DIRECTORY_FILE);
|
|
|
|
if (! NT_SUCCESS(Status)) {
|
|
|
|
DEBUG_LOG_EVENT (Status, NULL, NULL);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Open volume `%wZ' failed with status %X \n",
|
|
&VolumePath,
|
|
Status));
|
|
continue;
|
|
}
|
|
|
|
//
|
|
// Get volume characteristics.
|
|
//
|
|
|
|
Status = NtQueryVolumeInformationFile (VolumeHandle,
|
|
&IoStatusBlock,
|
|
&DeviceInfo,
|
|
sizeof (DeviceInfo),
|
|
FileFsDeviceInformation);
|
|
|
|
if (! NT_SUCCESS(Status)) {
|
|
|
|
DEBUG_LOG_EVENT (Status, NULL, NULL);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Query volume `%wZ' (handle %p) for "
|
|
"device info failed with status %X \n",
|
|
&VolumePath,
|
|
VolumeHandle,
|
|
Status));
|
|
|
|
NtClose (VolumeHandle);
|
|
continue;
|
|
}
|
|
|
|
//
|
|
// Reject volumes that cannot store a paging file.
|
|
//
|
|
|
|
if (DeviceInfo.Characteristics & (FILE_FLOPPY_DISKETTE |
|
|
FILE_READ_ONLY_DEVICE |
|
|
FILE_REMOTE_DEVICE |
|
|
FILE_REMOVABLE_MEDIA )) {
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Volume `%wZ' (%X) cannot store a paging file \n",
|
|
&VolumePath,
|
|
DeviceInfo.Characteristics));
|
|
|
|
NtClose (VolumeHandle);
|
|
continue;
|
|
}
|
|
|
|
//
|
|
// Create a volume descriptor entry.
|
|
//
|
|
|
|
Volume = (PVOLUME_DESCRIPTOR) RtlAllocateHeap (RtlProcessHeap(),
|
|
HEAP_ZERO_MEMORY,
|
|
sizeof *Volume);
|
|
|
|
if (Volume == NULL) {
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Failed to allocate a volume descriptor (%u bytes) \n",
|
|
sizeof *Volume));
|
|
|
|
NtClose (VolumeHandle);
|
|
continue;
|
|
}
|
|
|
|
Volume->DriveLetter = Drive;
|
|
Volume->DeviceInfo = DeviceInfo;
|
|
|
|
//
|
|
// Check if this is the boot volume.
|
|
//
|
|
|
|
if (RtlUpcaseUnicodeChar(Volume->DriveLetter) ==
|
|
RtlUpcaseUnicodeChar(USER_SHARED_DATA->NtSystemRoot[0])) {
|
|
|
|
ASSERT (BootVolumeFound == FALSE);
|
|
|
|
Volume->BootVolume = 1;
|
|
BootVolumeFound = TRUE;
|
|
}
|
|
|
|
//
|
|
// Determine the size parameters of the volume.
|
|
//
|
|
|
|
Status = NtQueryVolumeInformationFile (VolumeHandle,
|
|
&IoStatusBlock,
|
|
&SizeInfo,
|
|
sizeof (SizeInfo),
|
|
FileFsSizeInformation);
|
|
|
|
if (! NT_SUCCESS(Status)) {
|
|
|
|
DEBUG_LOG_EVENT (Status, NULL, NULL);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Query volume `%wZ' (handle %p) for "
|
|
"size failed with status %X \n",
|
|
&VolumePath,
|
|
VolumeHandle,
|
|
Status));
|
|
|
|
RtlFreeHeap (RtlProcessHeap(), 0, Volume);
|
|
NtClose (VolumeHandle);
|
|
continue;
|
|
}
|
|
|
|
//
|
|
// We do not need the volume handle anymore.
|
|
//
|
|
|
|
NtClose (VolumeHandle);
|
|
|
|
//
|
|
// Compute free space on volume.
|
|
//
|
|
|
|
Volume->FreeSpace = RtlExtendedIntegerMultiply (SizeInfo.AvailableAllocationUnits,
|
|
SizeInfo.SectorsPerAllocationUnit);
|
|
|
|
Volume->FreeSpace = RtlExtendedIntegerMultiply (Volume->FreeSpace,
|
|
SizeInfo.BytesPerSector);
|
|
|
|
//
|
|
// Trim a little bit free space on volume to make sure a paging file
|
|
// will not use absolutely everything on disk.
|
|
//
|
|
|
|
if (Volume->FreeSpace.QuadPart > MINIMUM_REQUIRED_FREE_SPACE_ON_DISK) {
|
|
Volume->FreeSpace.QuadPart -= MINIMUM_REQUIRED_FREE_SPACE_ON_DISK;
|
|
} else {
|
|
Volume->FreeSpace.QuadPart = 0;
|
|
}
|
|
|
|
//
|
|
// Insert the new volume descriptor in decreasing order of
|
|
// amount of free space.
|
|
//
|
|
|
|
{
|
|
BOOLEAN Inserted = FALSE;
|
|
|
|
//
|
|
// silviuc: insert volumes in letter order instead of free space order
|
|
// Note that this is the current NT4, W2000, Whistler behavior.
|
|
// We do this because if we insert descriptors in free space order there
|
|
// are issues for ?:\pagefile.sys type of descriptors. The way it is
|
|
// written the algorithm would have the tendency to create in time
|
|
// after several reboot a pagefile on each volume even if only one is
|
|
// used each time. To fix this we need smart page file deletion routine
|
|
// for stale files. Since nobody uses ?:\ anyway (not yet) we will fix
|
|
// these together.
|
|
//
|
|
#if 0
|
|
PLIST_ENTRY Current;
|
|
PVOLUME_DESCRIPTOR Descriptor;
|
|
|
|
Current = SmpVolumeDescriptorList.Flink;
|
|
|
|
while (Current != &SmpVolumeDescriptorList) {
|
|
|
|
Descriptor = CONTAINING_RECORD (Current,
|
|
VOLUME_DESCRIPTOR,
|
|
List);
|
|
Current = Current->Flink;
|
|
|
|
ASSERT (Descriptor->Initialized == TRUE);
|
|
ASSERT (Descriptor->DriveLetter >= L'A' && Descriptor->DriveLetter <= L'Z');
|
|
|
|
if (Descriptor->FreeSpace.QuadPart < Volume->FreeSpace.QuadPart) {
|
|
|
|
Inserted = TRUE;
|
|
|
|
Volume->List.Flink = &(Descriptor->List);
|
|
Volume->List.Blink = Descriptor->List.Blink;
|
|
|
|
Descriptor->List.Blink->Flink = &(Volume->List);
|
|
Descriptor->List.Blink = &(Volume->List);
|
|
|
|
break;
|
|
}
|
|
}
|
|
#endif // #if 0
|
|
|
|
if (! Inserted) {
|
|
InsertTailList (&SmpVolumeDescriptorList, &(Volume->List));
|
|
}
|
|
|
|
Volume->Initialized = TRUE;
|
|
}
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID, DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Created volume descriptor for`%wZ' \n",
|
|
&VolumePath));
|
|
}
|
|
|
|
//
|
|
// We should have found at least the boot volume.
|
|
//
|
|
|
|
ASSERT (BootVolumeFound == TRUE);
|
|
|
|
//
|
|
// We should have something in the descriptor list by now.
|
|
//
|
|
|
|
ASSERT (! IsListEmpty (&SmpVolumeDescriptorList));
|
|
|
|
if (IsListEmpty (&SmpVolumeDescriptorList)) {
|
|
Status = STATUS_UNEXPECTED_IO_ERROR;
|
|
}
|
|
else {
|
|
Status = STATUS_SUCCESS;
|
|
}
|
|
|
|
return Status;
|
|
}
|
|
|
|
/////////////////////////////////////////////////////////////////////
|
|
/////////////////////////////////////////////////////////////////////
|
|
/////////////////////////////////////////////////////////////////////
|
|
|
|
NTSTATUS
|
|
SmpCreatePagingFiles (
|
|
VOID
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This function creates pagefiles according to the specifications
|
|
read from the registry.
|
|
|
|
Arguments:
|
|
|
|
None.
|
|
|
|
Return Value:
|
|
|
|
Returns the status of the last pagefile creation operation.
|
|
|
|
--*/
|
|
{
|
|
NTSTATUS Status;
|
|
PLIST_ENTRY Current;
|
|
PPAGING_FILE_DESCRIPTOR Descriptor;
|
|
BOOLEAN Created;
|
|
LARGE_INTEGER SizeDelta;
|
|
LARGE_INTEGER MinimumSize;
|
|
|
|
//
|
|
// We will let the system run without a pagefile if this is
|
|
// what the user wants even if it is risky. If we had registry
|
|
// specifier but we did not end up with descriptors we postpone
|
|
// action for a while. Lower in the function we will deal with
|
|
// this case.
|
|
//
|
|
|
|
if (SmpNumberOfPagingFiles == 0 && SmpRegistrySpecifierPresent == FALSE) {
|
|
|
|
ASSERT (IsListEmpty(&SmpPagingFileDescriptorList));
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: No paging file was requested \n"));
|
|
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
//
|
|
// Create volume descriptors for all valid volumes. The list of
|
|
// volumes is sorted in decreasing order of free space and therefore
|
|
// will come in handy when deciding on which volume we can create
|
|
// a paging file with highest chances of success.
|
|
//
|
|
|
|
Status = SmpCreateVolumeDescriptors ();
|
|
|
|
if (! NT_SUCCESS(Status)) {
|
|
|
|
DEBUG_LOG_EVENT (Status, NULL, NULL);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Failed to create volume descriptors (status %X) \n",
|
|
Status));
|
|
|
|
return Status;
|
|
}
|
|
|
|
//
|
|
// Create paging files based on registry descriptors.
|
|
//
|
|
|
|
Current = SmpPagingFileDescriptorList.Flink;
|
|
Created = FALSE;
|
|
|
|
while (Current != &SmpPagingFileDescriptorList) {
|
|
|
|
Descriptor = CONTAINING_RECORD (Current,
|
|
PAGING_FILE_DESCRIPTOR,
|
|
List);
|
|
|
|
Current = Current->Flink;
|
|
|
|
if (Descriptor->SystemManaged) {
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Creating a system managed paging file (`%wZ') \n",
|
|
&(Descriptor->Name)));
|
|
|
|
Status = SmpCreateSystemManagedPagingFile (Descriptor, FALSE);
|
|
|
|
if (! NT_SUCCESS(Status)) {
|
|
|
|
//
|
|
// Try again but this time allow decrease in size.
|
|
//
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Trying lower sizes for (`%wZ') \n",
|
|
&(Descriptor->Name)));
|
|
|
|
Status = SmpCreateSystemManagedPagingFile (Descriptor, TRUE);
|
|
}
|
|
}
|
|
else {
|
|
|
|
SmpValidatePagingFileSizes(Descriptor);
|
|
|
|
SizeDelta.QuadPart = (LONGLONG)PAGING_FILE_SIZE_DELTA;
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Creating a normal paging file (`%wZ') \n",
|
|
&(Descriptor->Name)));
|
|
|
|
if (Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET] == L'?') {
|
|
|
|
MinimumSize.QuadPart = Descriptor->MinSize.QuadPart;
|
|
|
|
Status = SmpCreatePagingFileOnAnyDrive (Descriptor,
|
|
&SizeDelta,
|
|
&MinimumSize);
|
|
|
|
if (!NT_SUCCESS(Status)) {
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Trying lower sizes for (`%wZ') \n",
|
|
&(Descriptor->Name)));
|
|
|
|
MinimumSize.QuadPart = (LONGLONG)MINIMUM_PAGING_FILE_SIZE;
|
|
|
|
Status = SmpCreatePagingFileOnAnyDrive (Descriptor,
|
|
&SizeDelta,
|
|
&MinimumSize);
|
|
}
|
|
}
|
|
else {
|
|
|
|
MinimumSize.QuadPart = (LONGLONG)MINIMUM_PAGING_FILE_SIZE;
|
|
|
|
Status = SmpCreatePagingFileOnFixedDrive (Descriptor,
|
|
&SizeDelta,
|
|
&MinimumSize);
|
|
}
|
|
}
|
|
|
|
if (NT_SUCCESS(Status)) {
|
|
Created = TRUE;
|
|
}
|
|
}
|
|
|
|
//
|
|
// If we did not manage to create even a single paging file
|
|
// assume we had a `?:\pagefile.sys' specifier.
|
|
//
|
|
|
|
if (! Created) {
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Creating emergency paging file. \n"));
|
|
|
|
Status = SmpCreateEmergencyPagingFile ();
|
|
}
|
|
|
|
//
|
|
// Delete any paging files that are not going to be used.
|
|
//
|
|
// silviuc: danger to delete user files having pagefile.sys name
|
|
// Plus it does not work for other nonstandard pagefile names.
|
|
// To do it the right way we need to have a registry key with the
|
|
// names of the pagefiles created on previous boot and delete whatever
|
|
// is not used on the current boot.
|
|
//
|
|
|
|
#if 0
|
|
SmpDeleteStalePagingFiles ();
|
|
#endif
|
|
|
|
return Status;
|
|
}
|
|
|
|
|
|
NTSTATUS
|
|
SmpCreateEmergencyPagingFile (
|
|
VOID
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine creates a paging file of type `?:\pagefile.sys'
|
|
(on any drive with system decided size or less). It will create
|
|
its own descriptor and put it at first element of paging file
|
|
descriptor list.
|
|
|
|
Arguments:
|
|
|
|
None.
|
|
|
|
Return Value:
|
|
|
|
STATUS_SUCCESS or various error codes.
|
|
|
|
--*/
|
|
{
|
|
PPAGING_FILE_DESCRIPTOR Descriptor;
|
|
NTSTATUS Status;
|
|
CHAR Buffer [64];
|
|
|
|
Descriptor = (PPAGING_FILE_DESCRIPTOR) RtlAllocateHeap (RtlProcessHeap(),
|
|
HEAP_ZERO_MEMORY,
|
|
sizeof *Descriptor);
|
|
|
|
if (Descriptor == NULL) {
|
|
return STATUS_NO_MEMORY;
|
|
}
|
|
|
|
RtlInitUnicodeString (&(Descriptor->Name), NULL);
|
|
RtlInitUnicodeString (&(Descriptor->Specifier), NULL);
|
|
|
|
wcscpy ((PWSTR)Buffer, STANDARD_PAGING_FILE_NAME);
|
|
ASSERT (sizeof(Buffer) > wcslen(STANDARD_PAGING_FILE_NAME) * sizeof(WCHAR));
|
|
Descriptor->Name.Buffer = (PWSTR)Buffer;
|
|
Descriptor->Name.Length = wcslen((PWSTR)Buffer) * sizeof(WCHAR);
|
|
Descriptor->Name.MaximumLength = Descriptor->Name.Length + sizeof(WCHAR);
|
|
|
|
Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET] = L'?';
|
|
Descriptor->SystemManaged = 1;
|
|
Descriptor->Emergency = 1;
|
|
Descriptor->AnyDrive = 1;
|
|
|
|
SmpNumberOfPagingFiles += 1;
|
|
InsertHeadList (&SmpPagingFileDescriptorList, &(Descriptor->List));
|
|
|
|
Status = SmpCreateSystemManagedPagingFile (Descriptor, TRUE);
|
|
|
|
return Status;
|
|
}
|
|
|
|
|
|
NTSTATUS
|
|
SmpCreateSystemManagedPagingFile (
|
|
PPAGING_FILE_DESCRIPTOR Descriptor,
|
|
BOOLEAN DecreaseSize
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine creates a system managed paging file.
|
|
|
|
Arguments:
|
|
|
|
Descriptor: paging file descriptor.
|
|
|
|
DecreaseSize: true if size from descriptor can be decreased.
|
|
|
|
Return Value:
|
|
|
|
Returns the status of the pagefile creation operation.
|
|
|
|
--*/
|
|
{
|
|
LARGE_INTEGER SizeDelta;
|
|
LARGE_INTEGER MinimumSize;
|
|
NTSTATUS Status;
|
|
|
|
ASSERT (SmpNumberOfPagingFiles >= 1);
|
|
ASSERT (!IsListEmpty(&SmpPagingFileDescriptorList));
|
|
ASSERT (Descriptor->SystemManaged == 1);
|
|
|
|
SmpMakeSystemManagedPagingFileDescriptor (Descriptor);
|
|
|
|
SmpValidatePagingFileSizes(Descriptor);
|
|
|
|
SizeDelta.QuadPart = (LONGLONG)PAGING_FILE_SIZE_DELTA;
|
|
|
|
if (DecreaseSize) {
|
|
MinimumSize.QuadPart = (LONGLONG)MINIMUM_PAGING_FILE_SIZE;
|
|
}
|
|
else {
|
|
MinimumSize.QuadPart = Descriptor->MinSize.QuadPart;
|
|
}
|
|
|
|
if (Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET] == L'?') {
|
|
|
|
Status = SmpCreatePagingFileOnAnyDrive (Descriptor,
|
|
&SizeDelta,
|
|
&MinimumSize);
|
|
}
|
|
else {
|
|
|
|
Status = SmpCreatePagingFileOnFixedDrive (Descriptor,
|
|
&SizeDelta,
|
|
&MinimumSize);
|
|
}
|
|
|
|
return Status;
|
|
}
|
|
|
|
|
|
NTSTATUS
|
|
SmpCreatePagingFile (
|
|
IN PUNICODE_STRING PageFileName,
|
|
IN PLARGE_INTEGER MinimumSize,
|
|
IN PLARGE_INTEGER MaximumSize,
|
|
IN ULONG Priority OPTIONAL
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine is a wrapper around NtCreatePagingFile useful
|
|
in case we need to add some debugging code.
|
|
|
|
Arguments:
|
|
|
|
Same arguments as NtCreatePagingFile.
|
|
|
|
Return Value:
|
|
|
|
Status of the pagefile creation operation.
|
|
|
|
--*/
|
|
{
|
|
NTSTATUS Status;
|
|
|
|
Status = NtCreatePagingFile (PageFileName,
|
|
MinimumSize,
|
|
MaximumSize,
|
|
Priority);
|
|
if (! NT_SUCCESS(Status)) {
|
|
|
|
DEBUG_LOG_EVENT (Status, "failed", PageFileName);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: NtCreatePagingFile (%wZ, %I64X, %I64X) failed with %X \n",
|
|
PageFileName,
|
|
MinimumSize->QuadPart,
|
|
MaximumSize->QuadPart,
|
|
Status));
|
|
}
|
|
else {
|
|
|
|
DEBUG_LOG_EVENT (Status, "success", PageFileName);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: NtCreatePagingFile (%wZ, %I64X, %I64X) succeeded. \n",
|
|
PageFileName,
|
|
MinimumSize->QuadPart,
|
|
MaximumSize->QuadPart));
|
|
}
|
|
|
|
return Status;
|
|
}
|
|
|
|
|
|
NTSTATUS
|
|
SmpCreatePagingFileOnFixedDrive (
|
|
IN OUT PPAGING_FILE_DESCRIPTOR Descriptor,
|
|
IN PLARGE_INTEGER SizeDelta,
|
|
IN PLARGE_INTEGER MinimumSize
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine creates a pagefile based on Descriptor. The descriptor
|
|
is assumed to have in the Name field a file name prefixed by a drive
|
|
letter (e.g. `c:\pagefile.sys'). The function will try to create the
|
|
pagefile on the specified drive. If this cannot be done due to space
|
|
limitations the function will try smaller sizes down to the absolute
|
|
minimum size specified as a parameter.
|
|
|
|
Note that the function can be forced to not retry with smaller sizes by
|
|
specifying a MinimumSize that is equal to Descriptor->MinSize.
|
|
|
|
Arguments:
|
|
|
|
Descriptor: paging file descriptor.
|
|
|
|
SizeDelta: size is decreased by this quantity before retrying
|
|
in case we did not manage to create the paging file with requested size.
|
|
|
|
MinimumSize: the function will try down to this size.
|
|
|
|
Return Value:
|
|
|
|
STATUS_SUCCESS if page file has been created. Various error codes
|
|
if it fails.
|
|
|
|
--*/
|
|
{
|
|
NTSTATUS Status;
|
|
PVOLUME_DESCRIPTOR Volume;
|
|
LARGE_INTEGER RealFreeSpace;
|
|
BOOLEAN FoundPagingFile;
|
|
|
|
ASSERT (Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET] != L'?');
|
|
|
|
FoundPagingFile = FALSE;
|
|
|
|
//
|
|
// Get the volume descriptor for this paging file descriptor.
|
|
//
|
|
|
|
Volume = SmpSearchVolumeDescriptor (Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET]);
|
|
|
|
if (Volume == NULL) {
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: No volume descriptor for `%wZ' \n",
|
|
&(Descriptor->Name)));
|
|
|
|
return STATUS_INVALID_PARAMETER;
|
|
}
|
|
|
|
//
|
|
// Before creating the paging file, check if there is a
|
|
// crashdump in it. If so, SmpCheckForCrashDump will
|
|
// do whatever is necessary to process the crashdump.
|
|
//
|
|
|
|
if (Volume->BootVolume) {
|
|
|
|
if (Descriptor->CrashdumpChecked == 0) {
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Checking for crash dump in `%wZ' on boot volume \n",
|
|
&(Descriptor->Name)));
|
|
|
|
SmpCheckForCrashDump (&(Descriptor->Name));
|
|
|
|
Status = SmpGetVolumeFreeSpace (Volume);
|
|
|
|
if (!NT_SUCCESS(Status)) {
|
|
|
|
DEBUG_LOG_EVENT (Status, NULL, NULL);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Failed to query free space for boot volume `%wC'\n",
|
|
Volume->DriveLetter));
|
|
|
|
}
|
|
|
|
Descriptor->CrashdumpChecked = 1;
|
|
}
|
|
}
|
|
else {
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Skipping crash dump checking for `%wZ' on non boot volume `%wC' \n",
|
|
&(Descriptor->Name),
|
|
Volume->DriveLetter));
|
|
|
|
}
|
|
|
|
#if 0 // allow multiple pagefiles on the same drive
|
|
if (Volume->PagingFileCreated) {
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Paging file already created for volume %wc \n",
|
|
Volume->DriveLetter));
|
|
|
|
return STATUS_INVALID_PARAMETER;
|
|
}
|
|
#endif
|
|
|
|
//
|
|
// Get the size of the future paging file if it exists.
|
|
// In case of error (e.g. paging file does not exist yet)
|
|
// RealFreeSpace will contain zero.
|
|
//
|
|
|
|
Descriptor->RealMinSize.QuadPart = Descriptor->MinSize.QuadPart;
|
|
Descriptor->RealMaxSize.QuadPart = Descriptor->MaxSize.QuadPart;
|
|
|
|
Status = SmpGetPagingFileSize (&(Descriptor->Name),
|
|
&RealFreeSpace);
|
|
|
|
if (RealFreeSpace.QuadPart > 0) {
|
|
FoundPagingFile = TRUE;
|
|
}
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Detected size %I64X for future paging file `%wZ'\n",
|
|
RealFreeSpace.QuadPart,
|
|
&(Descriptor->Name)));
|
|
|
|
//
|
|
// Adjust the free space with the size of the paging file.
|
|
//
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Free space on volume `%wC' is %I64X \n",
|
|
Volume->DriveLetter,
|
|
Volume->FreeSpace.QuadPart));
|
|
|
|
RealFreeSpace.QuadPart += Volume->FreeSpace.QuadPart;
|
|
|
|
if (Descriptor->RealMinSize.QuadPart > RealFreeSpace.QuadPart) {
|
|
Descriptor->RealMinSize.QuadPart = RealFreeSpace.QuadPart;
|
|
}
|
|
|
|
if (Descriptor->RealMaxSize.QuadPart > RealFreeSpace.QuadPart) {
|
|
Descriptor->RealMaxSize.QuadPart = RealFreeSpace.QuadPart;
|
|
}
|
|
|
|
//
|
|
// Create the paging file.
|
|
//
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: min %I64X, max %I64X, real min %I64X \n",
|
|
Descriptor->RealMinSize.QuadPart,
|
|
Descriptor->RealMaxSize.QuadPart,
|
|
MinimumSize->QuadPart));
|
|
|
|
while (Descriptor->RealMinSize.QuadPart >= MinimumSize->QuadPart) {
|
|
|
|
Status = SmpCreatePagingFile (&(Descriptor->Name),
|
|
&(Descriptor->RealMinSize),
|
|
&(Descriptor->RealMaxSize),
|
|
0);
|
|
|
|
if (NT_SUCCESS(Status)) {
|
|
|
|
Descriptor->Created = TRUE;
|
|
Volume->PagingFileCreated = TRUE;
|
|
Volume->PagingFileCount += 1;
|
|
|
|
break;
|
|
}
|
|
|
|
Descriptor->RealMinSize.QuadPart -= SizeDelta->QuadPart;
|
|
}
|
|
|
|
if (Descriptor->RealMinSize.QuadPart < MinimumSize->QuadPart) {
|
|
|
|
//
|
|
// If are here we did not manage to create a paging file. This
|
|
// can happen for various reasons. For example the initial
|
|
// paging file descriptor had a size that was too small (usually
|
|
// sizes below 16Mb are rejected). For these cases we have to
|
|
// delete any paging file left on the drive.
|
|
//
|
|
|
|
if (FoundPagingFile) {
|
|
|
|
SmpDeletePagingFile (&(Descriptor->Name));
|
|
}
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Failing for min %I64X, max %I64X, real min %I64X \n",
|
|
Descriptor->RealMinSize.QuadPart,
|
|
Descriptor->RealMaxSize.QuadPart,
|
|
MinimumSize->QuadPart));
|
|
|
|
return STATUS_DISK_FULL;
|
|
}
|
|
else {
|
|
return Status;
|
|
}
|
|
}
|
|
|
|
|
|
NTSTATUS
|
|
SmpCreatePagingFileOnAnyDrive(
|
|
IN OUT PPAGING_FILE_DESCRIPTOR Descriptor,
|
|
IN PLARGE_INTEGER SizeDelta,
|
|
IN PLARGE_INTEGER MinimumSize
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This function creates a pagefile based on Descriptor. The descriptor
|
|
is assumed to have in the Name field a file name prefixed by `?'
|
|
(e.g. `?:\pagefile.sys'). The function will try to create the
|
|
pagefile on any drive. If this cannot be done due to space
|
|
limitations the function will try smaller sizes down to the absolute
|
|
minimum size specified as a parameter.
|
|
|
|
Note that the function can be forced to not retry with smaller sizes by
|
|
specifying an AbsoluteMinSizeInMb that is equal to Descriptor->MinSizeInMb.
|
|
|
|
Arguments:
|
|
|
|
Descriptor: paging file descriptor.
|
|
|
|
SizeDelta: size is decreased by this quantity before retrying
|
|
in case we did not manage to create the paging file with requested size.
|
|
|
|
MinimumSize: the function will try down to this size.
|
|
|
|
Return Value:
|
|
|
|
NT_SUCCESS if page file has been created. Various error codes if it
|
|
fails.
|
|
|
|
--*/
|
|
{
|
|
PLIST_ENTRY Current;
|
|
PVOLUME_DESCRIPTOR Volume;
|
|
NTSTATUS Status;
|
|
|
|
ASSERT (Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET] == L'?');
|
|
|
|
//
|
|
// Iterate the sorted list of volume descriptors.
|
|
//
|
|
|
|
Current = SmpVolumeDescriptorList.Flink;
|
|
|
|
Status = STATUS_DISK_FULL;
|
|
|
|
while (Current != &SmpVolumeDescriptorList) {
|
|
|
|
Volume = CONTAINING_RECORD (Current,
|
|
VOLUME_DESCRIPTOR,
|
|
List);
|
|
|
|
Current = Current->Flink;
|
|
|
|
ASSERT (Volume->Initialized == TRUE);
|
|
ASSERT (Volume->DriveLetter >= L'A' && Volume->DriveLetter <= L'Z');
|
|
|
|
Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET] = Volume->DriveLetter;
|
|
|
|
Status = SmpCreatePagingFileOnFixedDrive (Descriptor,
|
|
SizeDelta,
|
|
MinimumSize);
|
|
|
|
if (NT_SUCCESS(Status)) {
|
|
break;
|
|
}
|
|
|
|
Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET] = L'?';
|
|
}
|
|
|
|
return Status;
|
|
}
|
|
|
|
|
|
NTSTATUS
|
|
SmpValidatePagingFileSizes(
|
|
IN PPAGING_FILE_DESCRIPTOR Descriptor
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This function validates the min/max paging file sizes specified.
|
|
It takes into consideration the architecture, the type of kernel
|
|
(pae vs. nonpae), multiboot scenarios, etc..
|
|
|
|
Arguments:
|
|
|
|
Descriptor: paging file descriptor.
|
|
|
|
Return Value:
|
|
|
|
NT_SUCCESS if we have succesfully decided what are the proper sizes.
|
|
In case of success the Min/MaxSize fileds of the paging file descriptor
|
|
will get filled with proper sizes.
|
|
|
|
--*/
|
|
{
|
|
NTSTATUS Status;
|
|
ULONGLONG MinSize;
|
|
ULONGLONG MaxSize;
|
|
const ULONGLONG SIZE_1_MB = 0x100000;
|
|
const ULONGLONG SIZE_1_GB = 1024 * SIZE_1_MB;
|
|
const ULONGLONG SIZE_1_TB = 1024 * SIZE_1_GB;
|
|
BOOLEAN SizeTrimmed = FALSE;;
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Validating sizes for `%wZ' %I64X %I64X\n",
|
|
&(Descriptor->Name),
|
|
Descriptor->MinSize.QuadPart,
|
|
Descriptor->MaxSize.QuadPart));
|
|
|
|
MinSize = (ULONGLONG)(Descriptor->MinSize.QuadPart);
|
|
MaxSize = (ULONGLONG)(Descriptor->MaxSize.QuadPart);
|
|
|
|
//
|
|
// Make sure max is bigger than min.
|
|
//
|
|
|
|
if (MinSize > MaxSize) {
|
|
MaxSize = MinSize;
|
|
}
|
|
|
|
//
|
|
// Check if min/max sizes are not too big.
|
|
//
|
|
|
|
Status = STATUS_SUCCESS;
|
|
|
|
#if defined(i386)
|
|
|
|
//
|
|
// X86 32 bits supports max 4095 Mb per pagefile
|
|
// X86 PAE supports 16 Tb per pagefile
|
|
//
|
|
// If USER_SHARED_DATA structure has not been initialized
|
|
// we will use the standard x86 limits.
|
|
//
|
|
|
|
if (USER_SHARED_DATA->ProcessorFeatures[PF_PAE_ENABLED]) {
|
|
|
|
//
|
|
// We are in PAE mode.
|
|
//
|
|
|
|
if (MinSize > 16 * SIZE_1_TB) {
|
|
SizeTrimmed = TRUE;
|
|
MinSize = 16 * SIZE_1_TB;
|
|
}
|
|
|
|
if (MaxSize > 16 * SIZE_1_TB) {
|
|
SizeTrimmed = TRUE;
|
|
MaxSize = 16 * SIZE_1_TB;
|
|
}
|
|
}
|
|
else {
|
|
|
|
//
|
|
// Standard x86 mode.
|
|
//
|
|
|
|
if (MinSize > 4095 * SIZE_1_MB) {
|
|
SizeTrimmed = TRUE;
|
|
MinSize = 4095 * SIZE_1_MB;
|
|
}
|
|
|
|
if (MaxSize > 4095 * SIZE_1_MB) {
|
|
SizeTrimmed = TRUE;
|
|
MaxSize = 4095 * SIZE_1_MB;
|
|
}
|
|
}
|
|
|
|
#elif defined(_WIN64)
|
|
|
|
//
|
|
// IA64, AXP64 support 32 Tb per pagefile
|
|
// AMD64 supports 16 Tb per pagefile
|
|
//
|
|
// We will use for all cases 16 Tb which is anyway a huge
|
|
// number for the foreseeable future.
|
|
//
|
|
|
|
if (MinSize > 16 * SIZE_1_TB) {
|
|
SizeTrimmed = TRUE;
|
|
MinSize = 16 * SIZE_1_TB;
|
|
}
|
|
|
|
if (MaxSize > 16 * SIZE_1_TB) {
|
|
SizeTrimmed = TRUE;
|
|
MaxSize = 16 * SIZE_1_TB;
|
|
}
|
|
#else
|
|
|
|
//
|
|
// If we did not recognize the architecture we play it
|
|
// as safe as possible.
|
|
//
|
|
|
|
if (MinSize > 4095 * SIZE_1_MB) {
|
|
SizeTrimmed = TRUE;
|
|
MinSize = 4095 * SIZE_1_MB;
|
|
}
|
|
|
|
if (MaxSize > 4095 * SIZE_1_MB) {
|
|
SizeTrimmed = TRUE;
|
|
MaxSize = 4095 * SIZE_1_MB;
|
|
}
|
|
|
|
#endif
|
|
|
|
if (SizeTrimmed) {
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Trimmed size of `%wZ' to maximum allowed \n",
|
|
&(Descriptor->Name)));
|
|
}
|
|
|
|
if (SizeTrimmed) {
|
|
Descriptor->SizeTrimmed = 1;
|
|
}
|
|
|
|
Descriptor->MinSize.QuadPart = (LONGLONG)MinSize;
|
|
Descriptor->MaxSize.QuadPart = (LONGLONG)MaxSize;
|
|
|
|
return Status;
|
|
}
|
|
|
|
|
|
PVOLUME_DESCRIPTOR
|
|
SmpSearchVolumeDescriptor (
|
|
WCHAR DriveLetter
|
|
)
|
|
{
|
|
PLIST_ENTRY Current;
|
|
PVOLUME_DESCRIPTOR Volume;
|
|
|
|
DriveLetter = RtlUpcaseUnicodeChar(DriveLetter);
|
|
Current = SmpVolumeDescriptorList.Flink;
|
|
|
|
while (Current != &SmpVolumeDescriptorList) {
|
|
|
|
Volume = CONTAINING_RECORD (Current,
|
|
VOLUME_DESCRIPTOR,
|
|
List);
|
|
|
|
Current = Current->Flink;
|
|
|
|
ASSERT (Volume->Initialized == TRUE);
|
|
ASSERT (Volume->DriveLetter >= L'A' && Volume->DriveLetter <= L'Z');
|
|
|
|
if (Volume->DriveLetter == DriveLetter) {
|
|
return Volume;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
VOID
|
|
SmpMakeSystemManagedPagingFileDescriptor (
|
|
IN OUT PPAGING_FILE_DESCRIPTOR Descriptor
|
|
)
|
|
{
|
|
NTSTATUS Status;
|
|
ULONGLONG MinSize;
|
|
ULONGLONG MaxSize;
|
|
SYSTEM_BASIC_INFORMATION SystemInformation;
|
|
ULONGLONG Ram;
|
|
const ULONGLONG SIZE_1_MB = 0x100000;
|
|
const ULONGLONG SIZE_1_GB = 1024 * SIZE_1_MB;
|
|
|
|
Status = NtQuerySystemInformation (SystemBasicInformation,
|
|
&SystemInformation,
|
|
sizeof SystemInformation,
|
|
NULL);
|
|
|
|
if (! NT_SUCCESS (Status)) {
|
|
|
|
DEBUG_LOG_EVENT (Status, NULL, NULL);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: NtQuerySystemInformation failed with %x \n",
|
|
Status));
|
|
|
|
SmpMakeDefaultPagingFileDescriptor (Descriptor);
|
|
}
|
|
else {
|
|
|
|
Ram = (ULONGLONG)(SystemInformation.NumberOfPhysicalPages) *
|
|
SystemInformation.PageSize;
|
|
|
|
//
|
|
// RAM Min Max
|
|
//
|
|
// < 1Gb 1.5 x 3 x
|
|
// >= 1Gb 1 x 3 x
|
|
//
|
|
|
|
if (Ram < SIZE_1_GB) {
|
|
|
|
MinSize = 3 * Ram / 2;
|
|
MaxSize = 3 * Ram;
|
|
}
|
|
else {
|
|
|
|
MinSize = Ram;
|
|
MaxSize = 3 * Ram;
|
|
}
|
|
|
|
Descriptor->MinSize.QuadPart = (LONGLONG)MinSize;
|
|
Descriptor->MaxSize.QuadPart = (LONGLONG)MaxSize;
|
|
Descriptor->SystemManaged = 1;
|
|
}
|
|
}
|
|
|
|
|
|
VOID
|
|
SmpMakeDefaultPagingFileDescriptor (
|
|
IN OUT PPAGING_FILE_DESCRIPTOR Descriptor
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This function is called if we failed to come up with paging
|
|
file descriptors. It will create some default settings that will
|
|
be used to create a pagefile.
|
|
|
|
Arguments:
|
|
|
|
EmergencyDesriptor: pointer to one paging file descriptor that will
|
|
be filled with some emergency values.
|
|
|
|
Return Value:
|
|
|
|
None. This function will always succeed.
|
|
|
|
--*/
|
|
{
|
|
const ULONGLONG SIZE_1_MB = 0x100000;
|
|
|
|
Descriptor->MinSize.QuadPart = (LONGLONG)128 * SIZE_1_MB;
|
|
Descriptor->MaxSize.QuadPart = (LONGLONG)128 * SIZE_1_MB;
|
|
Descriptor->DefaultSize = 1;
|
|
}
|
|
|
|
|
|
NTSTATUS
|
|
SmpDeleteStalePagingFiles (
|
|
VOID
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine iterates all volumes from volume descriptor list and
|
|
deletes stale paging files. If we created a new one on top of the old
|
|
one we will skip of course.
|
|
|
|
Arguments:
|
|
|
|
None.
|
|
|
|
Return Value:
|
|
|
|
STATUS_SUCCESS or various error codes.
|
|
|
|
--*/
|
|
{
|
|
PLIST_ENTRY Current;
|
|
PVOLUME_DESCRIPTOR Volume;
|
|
UNICODE_STRING PageFileName;
|
|
CHAR Buffer [64];
|
|
OBJECT_ATTRIBUTES ObjectAttributes;
|
|
IO_STATUS_BLOCK IoStatusBlock;
|
|
HANDLE PageFileHandle;
|
|
NTSTATUS Status;
|
|
FILE_DISPOSITION_INFORMATION Disposition;
|
|
|
|
Current = SmpVolumeDescriptorList.Flink;
|
|
|
|
while (Current != &SmpVolumeDescriptorList) {
|
|
|
|
Volume = CONTAINING_RECORD (Current,
|
|
VOLUME_DESCRIPTOR,
|
|
List);
|
|
|
|
Current = Current->Flink;
|
|
|
|
ASSERT (Volume->Initialized == TRUE);
|
|
ASSERT (Volume->DriveLetter >= L'A' && Volume->DriveLetter <= L'Z');
|
|
|
|
if (Volume->PagingFilePresent == 1 && Volume->PagingFileCreated == 0) {
|
|
|
|
wcscpy ((PWSTR)Buffer, STANDARD_PAGING_FILE_NAME);
|
|
ASSERT (sizeof(Buffer) > wcslen(STANDARD_PAGING_FILE_NAME) * sizeof(WCHAR));
|
|
|
|
PageFileName.Buffer = (PWSTR)Buffer;
|
|
PageFileName.Length = wcslen((PWSTR)Buffer) * sizeof(WCHAR);
|
|
PageFileName.MaximumLength = PageFileName.Length + sizeof(WCHAR);
|
|
PageFileName.Buffer[STANDARD_DRIVE_LETTER_OFFSET] = Volume->DriveLetter;
|
|
|
|
InitializeObjectAttributes (&ObjectAttributes,
|
|
&PageFileName,
|
|
OBJ_CASE_INSENSITIVE,
|
|
NULL,
|
|
NULL);
|
|
|
|
//
|
|
// We check the paging file attributes and if these are not the typical
|
|
// ones (hidden and system) we will skip this file.
|
|
//
|
|
|
|
if (! SmpIsPossiblePagingFile (&ObjectAttributes, &PageFileName)) {
|
|
continue;
|
|
}
|
|
|
|
//
|
|
// Open the paging file for deletion.
|
|
//
|
|
|
|
Status = NtOpenFile (&PageFileHandle,
|
|
(ACCESS_MASK)DELETE,
|
|
&ObjectAttributes,
|
|
&IoStatusBlock,
|
|
FILE_SHARE_DELETE |
|
|
FILE_SHARE_READ |
|
|
FILE_SHARE_WRITE,
|
|
FILE_NON_DIRECTORY_FILE);
|
|
|
|
if (! NT_SUCCESS (Status)) {
|
|
|
|
DEBUG_LOG_EVENT (Status, NULL, NULL);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Failed to open page file `%wZ' for "
|
|
"deletion (status %X)\n",
|
|
&PageFileName,
|
|
Status));
|
|
|
|
}
|
|
else {
|
|
|
|
Disposition.DeleteFile = TRUE;
|
|
|
|
Status = NtSetInformationFile (PageFileHandle,
|
|
&IoStatusBlock,
|
|
&Disposition,
|
|
sizeof( Disposition ),
|
|
FileDispositionInformation);
|
|
|
|
if (NT_SUCCESS(Status)) {
|
|
|
|
DEBUG_LOG_EVENT (Status, NULL, NULL);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Deleted stale paging file - %wZ\n",
|
|
&PageFileName));
|
|
}
|
|
else {
|
|
|
|
DEBUG_LOG_EVENT (Status, NULL, NULL);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Failed to delete page file `%wZ' "
|
|
"(status %X)\n",
|
|
&PageFileName,
|
|
Status));
|
|
}
|
|
|
|
NtClose(PageFileHandle);
|
|
}
|
|
}
|
|
}
|
|
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
|
|
NTSTATUS
|
|
SmpDeletePagingFile (
|
|
PUNICODE_STRING PageFileName
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine deletes the paging file described by name.
|
|
|
|
Arguments:
|
|
|
|
Descriptor: Paging file name.
|
|
|
|
Return Value:
|
|
|
|
STATUS_SUCCESS or various error codes.
|
|
|
|
--*/
|
|
{
|
|
OBJECT_ATTRIBUTES ObjectAttributes;
|
|
IO_STATUS_BLOCK IoStatusBlock;
|
|
HANDLE PageFileHandle;
|
|
NTSTATUS Status;
|
|
FILE_DISPOSITION_INFORMATION Disposition;
|
|
|
|
InitializeObjectAttributes (&ObjectAttributes,
|
|
PageFileName,
|
|
OBJ_CASE_INSENSITIVE,
|
|
NULL,
|
|
NULL);
|
|
|
|
//
|
|
// Open the paging file for deletion.
|
|
//
|
|
|
|
Status = NtOpenFile (&PageFileHandle,
|
|
(ACCESS_MASK)DELETE,
|
|
&ObjectAttributes,
|
|
&IoStatusBlock,
|
|
FILE_SHARE_DELETE |
|
|
FILE_SHARE_READ |
|
|
FILE_SHARE_WRITE,
|
|
FILE_NON_DIRECTORY_FILE);
|
|
|
|
if (! NT_SUCCESS (Status)) {
|
|
|
|
DEBUG_LOG_EVENT (Status, NULL, NULL);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Failed to open for deletion page file `%wZ' "
|
|
"(status %X)\n",
|
|
PageFileName,
|
|
Status));
|
|
}
|
|
else {
|
|
|
|
Disposition.DeleteFile = TRUE;
|
|
|
|
Status = NtSetInformationFile (PageFileHandle,
|
|
&IoStatusBlock,
|
|
&Disposition,
|
|
sizeof( Disposition ),
|
|
FileDispositionInformation);
|
|
|
|
if (NT_SUCCESS(Status)) {
|
|
|
|
DEBUG_LOG_EVENT (Status, NULL, NULL);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Deleted stale paging file - %wZ\n",
|
|
PageFileName));
|
|
}
|
|
else {
|
|
|
|
DEBUG_LOG_EVENT (Status, NULL, NULL);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Failed to delete page file `%wZ' "
|
|
"(status %X)\n",
|
|
PageFileName,
|
|
Status));
|
|
}
|
|
|
|
NtClose(PageFileHandle);
|
|
}
|
|
|
|
return Status;
|
|
}
|
|
|
|
|
|
BOOLEAN
|
|
SmpIsPossiblePagingFile (
|
|
POBJECT_ATTRIBUTES ObjectAttributes,
|
|
PUNICODE_STRING PageFileName
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine checks if the file passed as a parameter has typical
|
|
paging file attributes (system and hidden). If not then it is likely
|
|
that (a) user changed attirbutes or (b) this is not a pagefile but rather
|
|
a user file with this name.
|
|
|
|
Arguments:
|
|
|
|
ObjectAttributes
|
|
|
|
PageFileName
|
|
|
|
Return Value:
|
|
|
|
True if this is likely to be a paging file, false otherwise.
|
|
|
|
--*/
|
|
{
|
|
IO_STATUS_BLOCK IoStatusBlock;
|
|
HANDLE PageFileHandle;
|
|
NTSTATUS Status;
|
|
FILE_BASIC_INFORMATION FileInfo;
|
|
|
|
Status = NtOpenFile (&PageFileHandle,
|
|
(ACCESS_MASK)FILE_READ_ATTRIBUTES | SYNCHRONIZE,
|
|
ObjectAttributes,
|
|
&IoStatusBlock,
|
|
FILE_SHARE_READ | FILE_SHARE_WRITE,
|
|
FILE_SYNCHRONOUS_IO_NONALERT);
|
|
|
|
if (! NT_SUCCESS( Status )) {
|
|
|
|
DEBUG_LOG_EVENT (Status, NULL, NULL);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Failed to open for query file `%wZ' with status %X \n",
|
|
PageFileName,
|
|
Status));
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
Status = NtQueryInformationFile (PageFileHandle,
|
|
&IoStatusBlock,
|
|
&FileInfo,
|
|
sizeof (FileInfo),
|
|
FileBasicInformation);
|
|
|
|
if (! NT_SUCCESS( Status )) {
|
|
|
|
DEBUG_LOG_EVENT (Status, NULL, NULL);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Failed to query for attributes file `%wZ' with status %X \n",
|
|
PageFileName,
|
|
Status));
|
|
|
|
NtClose (PageFileHandle);
|
|
return FALSE;
|
|
}
|
|
|
|
//
|
|
// Close handle since we do not need it anymore.
|
|
//
|
|
|
|
NtClose (PageFileHandle);
|
|
|
|
//
|
|
// If the attributes are not system and hidden this is not likely to be a
|
|
// pagefile. Either the user changed attributes on the pagefile or it is
|
|
// not a pagefile at all.
|
|
//
|
|
|
|
if ((FileInfo.FileAttributes & PAGING_FILE_ATTRIBUTES) != PAGING_FILE_ATTRIBUTES) {
|
|
|
|
return FALSE;
|
|
}
|
|
else {
|
|
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
|
|
NTSTATUS
|
|
SmpGetPagingFileSize (
|
|
PUNICODE_STRING PageFileName,
|
|
PLARGE_INTEGER PageFileSize
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine checks if the file passed as a parameter exists and gets
|
|
its file size. This will be used to correct the free space available
|
|
on a volume.
|
|
|
|
Arguments:
|
|
|
|
PageFileName
|
|
|
|
PageFileSize
|
|
|
|
Return Value:
|
|
|
|
STATUS_SUCCESS if we managed to open a paging file and query the size.
|
|
|
|
--*/
|
|
{
|
|
IO_STATUS_BLOCK IoStatusBlock;
|
|
HANDLE PageFileHandle;
|
|
NTSTATUS Status;
|
|
OBJECT_ATTRIBUTES ObjectAttributes;
|
|
FILE_STANDARD_INFORMATION FileSizeInfo;
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Trying to get size for `%wZ'\n",
|
|
PageFileName));
|
|
|
|
PageFileSize->QuadPart = 0;
|
|
|
|
InitializeObjectAttributes (&ObjectAttributes,
|
|
PageFileName,
|
|
OBJ_CASE_INSENSITIVE,
|
|
NULL,
|
|
NULL);
|
|
|
|
Status = NtOpenFile (&PageFileHandle,
|
|
(ACCESS_MASK)FILE_READ_ATTRIBUTES | SYNCHRONIZE,
|
|
&ObjectAttributes,
|
|
&IoStatusBlock,
|
|
FILE_SHARE_READ | FILE_SHARE_WRITE,
|
|
FILE_SYNCHRONOUS_IO_NONALERT);
|
|
|
|
if (! NT_SUCCESS( Status )) {
|
|
|
|
DEBUG_LOG_EVENT (Status, NULL, PageFileName);
|
|
|
|
return Status;
|
|
}
|
|
|
|
Status = NtQueryInformationFile (PageFileHandle,
|
|
&IoStatusBlock,
|
|
&FileSizeInfo,
|
|
sizeof (FileSizeInfo),
|
|
FileStandardInformation);
|
|
|
|
if (! NT_SUCCESS( Status )) {
|
|
|
|
DEBUG_LOG_EVENT (Status, NULL, PageFileName);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Failed query for size potential pagefile `%wZ' with status %X \n",
|
|
PageFileName,
|
|
Status));
|
|
|
|
NtClose (PageFileHandle);
|
|
return Status;
|
|
}
|
|
|
|
//
|
|
// We do not need the paging file handle anymore.
|
|
//
|
|
|
|
NtClose (PageFileHandle);
|
|
|
|
//
|
|
// Return size.
|
|
//
|
|
|
|
PageFileSize->QuadPart = FileSizeInfo.AllocationSize.QuadPart;
|
|
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
|
|
NTSTATUS
|
|
SmpGetVolumeFreeSpace (
|
|
PVOLUME_DESCRIPTOR Volume
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine computes the amount of free space on a volume.
|
|
|
|
Arguments:
|
|
|
|
Volume
|
|
|
|
FreeSpace
|
|
|
|
Return Value:
|
|
|
|
STATUS_SUCCESS if we managed to query the free space size.
|
|
|
|
--*/
|
|
{
|
|
NTSTATUS Status;
|
|
UNICODE_STRING VolumePath;
|
|
WCHAR Buffer[8];
|
|
OBJECT_ATTRIBUTES ObjectAttributes;
|
|
HANDLE VolumeHandle;
|
|
IO_STATUS_BLOCK IoStatusBlock;
|
|
FILE_FS_SIZE_INFORMATION SizeInfo;
|
|
|
|
//
|
|
// This function gets called only for boot volumes that contain
|
|
// crashdumps. Crashdump processing will modify the free space
|
|
// computed when the volume descriptor has been created.
|
|
//
|
|
|
|
ASSERT (Volume->BootVolume == 1);
|
|
|
|
//
|
|
// Create a template volume path.
|
|
//
|
|
|
|
wcscpy (Buffer, L"\\??\\A:\\");
|
|
VolumePath.Buffer = Buffer;
|
|
VolumePath.Length = wcslen(VolumePath.Buffer) * sizeof(WCHAR);
|
|
VolumePath.MaximumLength = VolumePath.Length + sizeof(WCHAR);
|
|
VolumePath.Buffer[STANDARD_DRIVE_LETTER_OFFSET] = Volume->DriveLetter;
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Querying volume `%wZ' for free space \n",
|
|
&VolumePath));
|
|
|
|
InitializeObjectAttributes (&ObjectAttributes,
|
|
&VolumePath,
|
|
OBJ_CASE_INSENSITIVE,
|
|
NULL,
|
|
NULL);
|
|
|
|
Status = NtOpenFile (&VolumeHandle,
|
|
(ACCESS_MASK)FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES | SYNCHRONIZE,
|
|
&ObjectAttributes,
|
|
&IoStatusBlock,
|
|
FILE_SHARE_READ | FILE_SHARE_WRITE,
|
|
FILE_SYNCHRONOUS_IO_NONALERT | FILE_DIRECTORY_FILE);
|
|
|
|
if (! NT_SUCCESS(Status)) {
|
|
|
|
DEBUG_LOG_EVENT (Status, NULL, NULL);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Open volume `%wZ' failed with status %X \n",
|
|
&VolumePath,
|
|
Status));
|
|
|
|
return Status;
|
|
}
|
|
|
|
//
|
|
// Determine the size parameters of the volume.
|
|
//
|
|
|
|
Status = NtQueryVolumeInformationFile (VolumeHandle,
|
|
&IoStatusBlock,
|
|
&SizeInfo,
|
|
sizeof (SizeInfo),
|
|
FileFsSizeInformation);
|
|
|
|
if (! NT_SUCCESS(Status)) {
|
|
|
|
DEBUG_LOG_EVENT (Status, NULL, NULL);
|
|
|
|
KdPrintEx ((DPFLTR_SMSS_ID,
|
|
DPFLTR_INFO_LEVEL,
|
|
"SMSS:PFILE: Query volume `%wZ' (handle %p) for "
|
|
"size failed with status %X \n",
|
|
&VolumePath,
|
|
VolumeHandle,
|
|
Status));
|
|
|
|
NtClose (VolumeHandle);
|
|
return Status;
|
|
}
|
|
|
|
//
|
|
// We do not need the volume handle anymore.
|
|
//
|
|
|
|
NtClose (VolumeHandle);
|
|
|
|
//
|
|
// Compute free space on volume.
|
|
//
|
|
|
|
Volume->FreeSpace = RtlExtendedIntegerMultiply (SizeInfo.AvailableAllocationUnits,
|
|
SizeInfo.SectorsPerAllocationUnit);
|
|
|
|
Volume->FreeSpace = RtlExtendedIntegerMultiply (Volume->FreeSpace,
|
|
SizeInfo.BytesPerSector);
|
|
|
|
//
|
|
// Trim a little bit free space on volume to make sure a paging file
|
|
// will not use absolutely everything on disk.
|
|
//
|
|
|
|
if (Volume->FreeSpace.QuadPart > MINIMUM_REQUIRED_FREE_SPACE_ON_DISK) {
|
|
Volume->FreeSpace.QuadPart -= MINIMUM_REQUIRED_FREE_SPACE_ON_DISK;
|
|
}
|
|
else {
|
|
Volume->FreeSpace.QuadPart = 0;
|
|
}
|
|
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
|
|
ULONG
|
|
SmpPagingFileExceptionFilter (
|
|
ULONG ExceptionCode,
|
|
PVOID ExceptionRecord
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine filters any exception that might occur in paging
|
|
file creation code paths.
|
|
|
|
Arguments:
|
|
|
|
ExceptionCode
|
|
|
|
ExceptionRecord
|
|
|
|
Return Value:
|
|
|
|
EXCEPTION_CONTINUE_SEARCH for most of the cases since we want smss
|
|
to crash so that we can investigate what was going on.
|
|
|
|
--*/
|
|
{
|
|
//
|
|
// Save exception information for debugging.
|
|
//
|
|
|
|
SmpPagingExceptionCode = ExceptionCode;
|
|
SmpPagingExceptionRecord = ExceptionRecord;
|
|
|
|
//
|
|
// We print this message no matter what because we want to know
|
|
// what happened if smss crashes.
|
|
//
|
|
|
|
DbgPrint ("SMSS:PFILE: unexpected exception %X with record %p \n",
|
|
ExceptionCode,
|
|
ExceptionRecord);
|
|
|
|
#if DBG
|
|
DbgBreakPoint ();
|
|
#endif
|
|
|
|
return EXCEPTION_CONTINUE_SEARCH;
|
|
}
|
|
|
|
|