pagefile.c File Reference

#include "smss.h"
#include <debug.h>

Include dependency graph for pagefile.c:

Go to the source code of this file.

Classes
struct	_SMP_PAGEFILE_DESCRIPTOR
struct	_SMP_VOLUME_DESCRIPTOR

Macros
#define	NDEBUG
#define	STANDARD_PAGING_FILE_NAME   L"\\??\\?:\\pagefile.sys"
#define	STANDARD_DRIVE_LETTER_OFFSET   4
#define	MAX_PAGING_FILES   16
#define	MEGABYTE   (1024 * 1024)
#define	GIGABYTE   (1024ULL * MEGABYTE)
#define	TERABYTE   (1024ULL * GIGABYTE)
#define	MAXIMUM_PAGEFILE_SIZE32   ((1ULL * 1024 * 1024 - 1) * PAGE_SIZE)
#define	MAXIMUM_PAGEFILE_SIZE64   ((4ULL * 1024 * 1024 * 1024 - 1) * PAGE_SIZE)
#define	MAXIMUM_PAGEFILE_SIZE   MAXIMUM_PAGEFILE_SIZE32
#define	MINIMUM_TO_KEEP_FREE   (256 * MEGABYTE)
#define	FUZZ_FACTOR   (16 * MEGABYTE)
#define	SMP_PAGEFILE_CREATED   0x01
#define	SMP_PAGEFILE_DEFAULT   0x02
#define	SMP_PAGEFILE_SYSTEM_MANAGED   0x04
#define	SMP_PAGEFILE_WAS_TOO_BIG   0x08
#define	SMP_PAGEFILE_ON_ANY_DRIVE   0x10
#define	SMP_PAGEFILE_EMERGENCY   0x20
#define	SMP_PAGEFILE_DUMP_PROCESSED   0x40
#define	SMP_VOLUME_INSERTED   0x01
#define	SMP_VOLUME_PAGEFILE_CREATED   0x04
#define	SMP_VOLUME_IS_BOOT   0x08

Typedefs
typedef struct _SMP_PAGEFILE_DESCRIPTOR	SMP_PAGEFILE_DESCRIPTOR
typedef struct _SMP_PAGEFILE_DESCRIPTOR *	PSMP_PAGEFILE_DESCRIPTOR
typedef struct _SMP_VOLUME_DESCRIPTOR	SMP_VOLUME_DESCRIPTOR
typedef struct _SMP_VOLUME_DESCRIPTOR *	PSMP_VOLUME_DESCRIPTOR

Functions
VOID NTAPI	SmpPagingFileInitialize (VOID)
NTSTATUS NTAPI	SmpCreatePagingFileDescriptor (IN PUNICODE_STRING PageFileToken)
NTSTATUS NTAPI	SmpGetPagingFileSize (IN PUNICODE_STRING FileName, OUT PLARGE_INTEGER Size)
NTSTATUS NTAPI	SmpDeletePagingFile (IN PUNICODE_STRING FileName)
NTSTATUS NTAPI	SmpGetVolumeFreeSpace (IN PSMP_VOLUME_DESCRIPTOR Volume)
PSMP_VOLUME_DESCRIPTOR NTAPI	SmpSearchVolumeDescriptor (IN WCHAR DriveLetter)
NTSTATUS NTAPI	SmpCreatePagingFile (IN PUNICODE_STRING Name, IN PLARGE_INTEGER MinSize, IN PLARGE_INTEGER MaxSize, IN ULONG Priority)
NTSTATUS NTAPI	SmpCreatePagingFileOnFixedDrive (IN PSMP_PAGEFILE_DESCRIPTOR Descriptor, IN PLARGE_INTEGER FuzzFactor, IN PLARGE_INTEGER MinimumSize)
NTSTATUS NTAPI	SmpCreatePagingFileOnAnyDrive (IN PSMP_PAGEFILE_DESCRIPTOR Descriptor, IN PLARGE_INTEGER FuzzFactor, IN PLARGE_INTEGER MinimumSize)
VOID NTAPI	SmpMakeDefaultPagingFileDescriptor (IN PSMP_PAGEFILE_DESCRIPTOR Descriptor)
VOID NTAPI	SmpMakeSystemManagedPagingFileDescriptor (IN PSMP_PAGEFILE_DESCRIPTOR Descriptor)
NTSTATUS NTAPI	SmpValidatePagingFileSizes (IN PSMP_PAGEFILE_DESCRIPTOR Descriptor)
NTSTATUS NTAPI	SmpCreateSystemManagedPagingFile (IN PSMP_PAGEFILE_DESCRIPTOR Descriptor, IN BOOLEAN DecreaseSize)
NTSTATUS NTAPI	SmpCreateEmergencyPagingFile (VOID)
NTSTATUS NTAPI	SmpCreateVolumeDescriptors (VOID)
NTSTATUS NTAPI	SmpCreatePagingFiles (VOID)

Variables
LIST_ENTRY	SmpPagingFileDescriptorList
LIST_ENTRY	SmpVolumeDescriptorList
BOOLEAN	SmpRegistrySpecifierPresent
ULONG	SmpNumberOfPagingFiles

Macro Definition Documentation

FUZZ_FACTOR

#define FUZZ_FACTOR   (16 * MEGABYTE)

Definition at line 82 of file pagefile.c.

GIGABYTE

#define GIGABYTE   (1024ULL * MEGABYTE)

Definition at line 30 of file pagefile.c.

MAX_PAGING_FILES

#define MAX_PAGING_FILES   16

Definition at line 23 of file pagefile.c.

MAXIMUM_PAGEFILE_SIZE

#define MAXIMUM_PAGEFILE_SIZE   MAXIMUM_PAGEFILE_SIZE32

Definition at line 76 of file pagefile.c.

MAXIMUM_PAGEFILE_SIZE32

#define MAXIMUM_PAGEFILE_SIZE32   ((1ULL * 1024 * 1024 - 1) * PAGE_SIZE)

Definition at line 35 of file pagefile.c.

MAXIMUM_PAGEFILE_SIZE64

#define MAXIMUM_PAGEFILE_SIZE64   ((4ULL * 1024 * 1024 * 1024 - 1) * PAGE_SIZE)

Definition at line 44 of file pagefile.c.

MEGABYTE

#define MEGABYTE   (1024 * 1024)

Definition at line 24 of file pagefile.c.

MINIMUM_TO_KEEP_FREE

#define MINIMUM_TO_KEEP_FREE   (256 * MEGABYTE)

Definition at line 81 of file pagefile.c.

NDEBUG

#define NDEBUG

Definition at line 13 of file pagefile.c.

SMP_PAGEFILE_CREATED

#define SMP_PAGEFILE_CREATED   0x01

Definition at line 87 of file pagefile.c.

SMP_PAGEFILE_DEFAULT

#define SMP_PAGEFILE_DEFAULT   0x02

Definition at line 88 of file pagefile.c.

SMP_PAGEFILE_DUMP_PROCESSED

#define SMP_PAGEFILE_DUMP_PROCESSED   0x40

Definition at line 93 of file pagefile.c.

SMP_PAGEFILE_EMERGENCY

#define SMP_PAGEFILE_EMERGENCY   0x20

Definition at line 92 of file pagefile.c.

SMP_PAGEFILE_ON_ANY_DRIVE

#define SMP_PAGEFILE_ON_ANY_DRIVE   0x10

Definition at line 91 of file pagefile.c.

SMP_PAGEFILE_SYSTEM_MANAGED

#define SMP_PAGEFILE_SYSTEM_MANAGED   0x04

Definition at line 89 of file pagefile.c.

SMP_PAGEFILE_WAS_TOO_BIG

#define SMP_PAGEFILE_WAS_TOO_BIG   0x08

Definition at line 90 of file pagefile.c.

SMP_VOLUME_INSERTED

#define SMP_VOLUME_INSERTED   0x01

Definition at line 109 of file pagefile.c.

SMP_VOLUME_IS_BOOT

#define SMP_VOLUME_IS_BOOT   0x08

Definition at line 111 of file pagefile.c.

SMP_VOLUME_PAGEFILE_CREATED

#define SMP_VOLUME_PAGEFILE_CREATED   0x04

Definition at line 110 of file pagefile.c.

STANDARD_DRIVE_LETTER_OFFSET

#define STANDARD_DRIVE_LETTER_OFFSET   4

Definition at line 22 of file pagefile.c.

STANDARD_PAGING_FILE_NAME

#define STANDARD_PAGING_FILE_NAME   L"\\??\\?:\\pagefile.sys"

Definition at line 21 of file pagefile.c.

TERABYTE

#define TERABYTE   (1024ULL * GIGABYTE)

Definition at line 31 of file pagefile.c.

Typedef Documentation

PSMP_PAGEFILE_DESCRIPTOR

typedef struct _SMP_PAGEFILE_DESCRIPTOR * PSMP_PAGEFILE_DESCRIPTOR

PSMP_VOLUME_DESCRIPTOR

typedef struct _SMP_VOLUME_DESCRIPTOR * PSMP_VOLUME_DESCRIPTOR

SMP_PAGEFILE_DESCRIPTOR

typedef struct _SMP_PAGEFILE_DESCRIPTOR SMP_PAGEFILE_DESCRIPTOR

SMP_VOLUME_DESCRIPTOR

typedef struct _SMP_VOLUME_DESCRIPTOR SMP_VOLUME_DESCRIPTOR

Function Documentation

SmpCreateEmergencyPagingFile()

NTSTATUS NTAPI SmpCreateEmergencyPagingFile

(

VOID

)

Definition at line 834 of file pagefile.c.

{
    PSMP_PAGEFILE_DESCRIPTOR Descriptor;
    WCHAR Buffer[32];

    /* Allocate a descriptor */
    Descriptor = RtlAllocateHeap(RtlGetProcessHeap(),
                                 HEAP_ZERO_MEMORY,
                                 sizeof(SMP_PAGEFILE_DESCRIPTOR));
    if (!Descriptor) return STATUS_NO_MEMORY;

    /* Initialize it */
    RtlInitUnicodeString(&Descriptor->Token, NULL);

    /* Copy the default pagefile name */
    ASSERT(sizeof(Buffer) >= sizeof(STANDARD_PAGING_FILE_NAME));
    wcscpy(Buffer, STANDARD_PAGING_FILE_NAME);

    /* Fill the rest of the descriptor out */
    RtlInitUnicodeString(&Descriptor->Name, Buffer);
    Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET] = '?';
    Descriptor->Flags |= SMP_PAGEFILE_SYSTEM_MANAGED |
                         SMP_PAGEFILE_EMERGENCY |
                         SMP_PAGEFILE_ON_ANY_DRIVE;

    /* Insert it into the descriptor list */
    InsertHeadList(&SmpPagingFileDescriptorList, &Descriptor->Entry);
    SmpNumberOfPagingFiles++;

    /* Go ahead and create it now, with the minimal size possible */
    return SmpCreateSystemManagedPagingFile(Descriptor, TRUE);
}

Referenced by SmpCreatePagingFiles().

SmpCreatePagingFile()

NTSTATUS NTAPI SmpCreatePagingFile	(	IN PUNICODE_STRING	Name,
		IN PLARGE_INTEGER	MinSize,
		IN PLARGE_INTEGER	MaxSize,
		IN ULONG	Priority
	)

Definition at line 504 of file pagefile.c.

{
    NTSTATUS Status;

    /* Tell the kernel to create the pagefile */
    Status = NtCreatePagingFile(Name, MinSize, MaxSize, Priority);
    if (NT_SUCCESS(Status))
    {
        DPRINT("SMSS:PFILE: NtCreatePagingFile(%wZ, 0x%I64X, 0x%I64X) succeeded\n",
                Name,
                MinSize->QuadPart,
                MaxSize->QuadPart);
    }
    else
    {
        DPRINT1("SMSS:PFILE: NtCreatePagingFile(%wZ, 0x%I64X, 0x%I64X) failed with %X\n",
                Name,
                MinSize->QuadPart,
                MaxSize->QuadPart,
                Status);
    }

    /* Return the status */
    return Status;
}

Referenced by SmpCreatePagingFileOnFixedDrive().

SmpCreatePagingFileDescriptor()

NTSTATUS NTAPI SmpCreatePagingFileDescriptor

(

IN PUNICODE_STRING

PageFileToken

)

Definition at line 139 of file pagefile.c.

{
    NTSTATUS Status;
    ULONG MinSize = 0, MaxSize = 0;
    BOOLEAN SystemManaged = FALSE, ZeroSize = TRUE;
    PSMP_PAGEFILE_DESCRIPTOR Descriptor, ListDescriptor;
    ULONG i;
    WCHAR c;
    PLIST_ENTRY NextEntry;
    UNICODE_STRING PageFileName, Arguments, SecondArgument;

    /* Make sure we don't have too many */
    if (SmpNumberOfPagingFiles >= MAX_PAGING_FILES)
    {
        DPRINT1("SMSS:PFILE: Too many paging files specified - %lu\n",
                SmpNumberOfPagingFiles);
        return STATUS_TOO_MANY_PAGING_FILES;
    }

    /* Parse the specified and get the name and arguments out of it */
    DPRINT("SMSS:PFILE: Paging file specifier `%wZ'\n", PageFileToken);
    Status = SmpParseCommandLine(PageFileToken,
                                 NULL,
                                 &PageFileName,
                                 NULL,
                                 &Arguments);
    if (!NT_SUCCESS(Status))
    {
        /* Fail */
        DPRINT1("SMSS:PFILE: SmpParseCommandLine(%wZ) failed - Status == %lx\n",
                PageFileToken, Status);
        return Status;
    }

    /* Set the variable to let everyone know we have a pagefile token */
    SmpRegistrySpecifierPresent = TRUE;

    /* Parse the arguments, if any */
    if (Arguments.Buffer)
    {
        /* Parse the pagefile size */
        for (i = 0; i < Arguments.Length / sizeof(WCHAR); i++)
        {
            /* Check if it's zero */
            c = Arguments.Buffer[i];
            if ((c != L' ') && (c != L'\t') && (c != L'0'))
            {
                /* It isn't, break out */
                ZeroSize = FALSE;
                break;
            }
        }
    }

    /* Was a pagefile not specified, or was it specified with no size? */
    if (!(Arguments.Buffer) || (ZeroSize))
    {
        /* In this case, the system will manage its size */
        SystemManaged = TRUE;
    }
    else
    {
        /* We do have a size, so convert the arguments into a number */
        Status = RtlUnicodeStringToInteger(&Arguments, 0, &MinSize);
        if (!NT_SUCCESS(Status))
        {
            /* Fail */
            RtlFreeUnicodeString(&PageFileName);
            RtlFreeUnicodeString(&Arguments);
            return Status;
        }

        /* Now advance to the next argument */
        for (i = 0; i < Arguments.Length / sizeof(WCHAR); i++)
        {
            /* Found a space -- second argument must start here */
            if (Arguments.Buffer[i] == L' ')
            {
                /* Use the rest of the arguments as a maximum size */
                SecondArgument.Buffer = &Arguments.Buffer[i];
                SecondArgument.Length = (USHORT)(Arguments.Length -
                                        i * sizeof(WCHAR));
                SecondArgument.MaximumLength = (USHORT)(Arguments.MaximumLength -
                                               i * sizeof(WCHAR));
                Status = RtlUnicodeStringToInteger(&SecondArgument, 0, &MaxSize);
                if (!NT_SUCCESS(Status))
                {
                    /* Fail */
                    RtlFreeUnicodeString(&PageFileName);
                    RtlFreeUnicodeString(&Arguments);
                    return Status;
                }

                break;
            }
        }
    }

    /* We are done parsing arguments */
    RtlFreeUnicodeString(&Arguments);

    /* Now we can allocate our descriptor */
    Descriptor = RtlAllocateHeap(RtlGetProcessHeap(),
                                 HEAP_ZERO_MEMORY,
                                 sizeof(SMP_PAGEFILE_DESCRIPTOR));
    if (!Descriptor)
    {
        /* Fail if we couldn't */
        RtlFreeUnicodeString(&PageFileName);
        return STATUS_NO_MEMORY;
    }

    /* Capture all our data into the descriptor */
    Descriptor->Token = *PageFileToken;
    Descriptor->Name = PageFileName;
    Descriptor->MinSize.QuadPart = MinSize * MEGABYTE;
    Descriptor->MaxSize.QuadPart = MaxSize * MEGABYTE;
    if (SystemManaged)
        Descriptor->Flags |= SMP_PAGEFILE_SYSTEM_MANAGED;
    Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET] =
    RtlUpcaseUnicodeChar(Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET]);
    if (Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET] == '?')
    {
        Descriptor->Flags |= SMP_PAGEFILE_ON_ANY_DRIVE;
    }

    /* Now loop the existing descriptors */
    NextEntry = SmpPagingFileDescriptorList.Flink;
    do
    {
        /* Are there none, or have we looped back to the beginning? */
        if (NextEntry == &SmpPagingFileDescriptorList)
        {
            /* This means no duplicates exist, so insert our descriptor! */
            InsertTailList(&SmpPagingFileDescriptorList, &Descriptor->Entry);
            SmpNumberOfPagingFiles++;
            DPRINT("SMSS:PFILE: Created descriptor for `%wZ' (`%wZ')\n",
                    PageFileToken, &Descriptor->Name);
            return STATUS_SUCCESS;
        }

        /* Keep going until we find a duplicate, unless we are in "any" mode */
        ListDescriptor = CONTAINING_RECORD(NextEntry, SMP_PAGEFILE_DESCRIPTOR, Entry);
        NextEntry = NextEntry->Flink;
    } while (!(ListDescriptor->Flags & SMP_PAGEFILE_ON_ANY_DRIVE) ||
             !(Descriptor->Flags & SMP_PAGEFILE_ON_ANY_DRIVE));

    /* We found a duplicate, so skip this descriptor/pagefile and fail */
    DPRINT1("SMSS:PFILE: Skipping duplicate specifier `%wZ'\n", PageFileToken);
    RtlFreeUnicodeString(&PageFileName);
    RtlFreeHeap(RtlGetProcessHeap(), 0, Descriptor);
    return STATUS_INVALID_PARAMETER;
}

Referenced by SmpLoadDataFromRegistry().

SmpCreatePagingFileOnAnyDrive()

NTSTATUS NTAPI SmpCreatePagingFileOnAnyDrive	(	IN PSMP_PAGEFILE_DESCRIPTOR	Descriptor,
		IN PLARGE_INTEGER	FuzzFactor,
		IN PLARGE_INTEGER	MinimumSize
	)

Definition at line 667 of file pagefile.c.

{
    PSMP_VOLUME_DESCRIPTOR Volume;
    NTSTATUS Status = STATUS_DISK_FULL;
    PLIST_ENTRY NextEntry;
    ASSERT(Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET] == L'?');

    /* Loop the volume list */
    NextEntry = SmpVolumeDescriptorList.Flink;
    while (NextEntry != &SmpVolumeDescriptorList)
    {
        /* Get the volume */
        Volume = CONTAINING_RECORD(NextEntry, SMP_VOLUME_DESCRIPTOR, Entry);

        /* Make sure it's inserted and on a valid drive letter */
        ASSERT(Volume->Flags & SMP_VOLUME_INSERTED); // Volume->Initialized in ASSERT
        ASSERT(Volume->DriveLetter >= L'A' && Volume->DriveLetter <= L'Z');

        /* Write the drive letter to try creating it on this volume */
        Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET] = Volume->DriveLetter;
        Status = SmpCreatePagingFileOnFixedDrive(Descriptor,
                                                 FuzzFactor,
                                                 MinimumSize);
        if (NT_SUCCESS(Status)) break;

        /* It didn't work, make it an any pagefile again and keep going */
        Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET] = L'?';
        NextEntry = NextEntry->Flink;
    }

    /* Return disk full or success */
    return Status;
}

Referenced by SmpCreatePagingFiles(), and SmpCreateSystemManagedPagingFile().

SmpCreatePagingFileOnFixedDrive()

NTSTATUS NTAPI SmpCreatePagingFileOnFixedDrive	(	IN PSMP_PAGEFILE_DESCRIPTOR	Descriptor,
		IN PLARGE_INTEGER	FuzzFactor,
		IN PLARGE_INTEGER	MinimumSize
	)

Definition at line 535 of file pagefile.c.

{
    PSMP_VOLUME_DESCRIPTOR Volume;
    BOOLEAN ShouldDelete;
    NTSTATUS Status;
    LARGE_INTEGER PageFileSize;
    ASSERT(Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET] != L'?');

    /* Try to find the volume descriptor for this drive letter */
    ShouldDelete = FALSE;
    Volume = SmpSearchVolumeDescriptor(Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET]);
    if (!Volume)
    {
        /* Couldn't find it, fail */
        DPRINT1("SMSS:PFILE: No volume descriptor for `%wZ'\n",
                &Descriptor->Name);
        return STATUS_INVALID_PARAMETER;
    }

    /* Check if this is the boot volume */
    if (Volume->Flags & SMP_VOLUME_IS_BOOT)
    {
        /* Check if we haven't yet processed a crash dump on this volume */
        if (!(Descriptor->Flags & SMP_PAGEFILE_DUMP_PROCESSED))
        {
            /* Try to find a crash dump and extract it */
            DPRINT("SMSS:PFILE: Checking for crash dump in `%wZ' on boot volume\n",
                    &Descriptor->Name);
            SmpCheckForCrashDump(&Descriptor->Name);

            /* Update how much free space we have now that we extracted a dump */
            Status = SmpGetVolumeFreeSpace(Volume);
            if (!NT_SUCCESS(Status))
            {
                DPRINT1("SMSS:PFILE: Failed to query free space for boot volume `%wC'\n",
                        Volume->DriveLetter);
            }
            else
            {
                DPRINT("Queried free space for boot volume `%wC: 0x%I64x'\n",
                        Volume->DriveLetter, Volume->FreeSpace.QuadPart);
            }

            /* Don't process crashdump on this volume anymore */
            Descriptor->Flags |= SMP_PAGEFILE_DUMP_PROCESSED;
        }
    }
    else
    {
        /* Crashdumps can only be on the boot volume */
        DPRINT("SMSS:PFILE: Skipping crash dump checking for `%wZ' on non boot"
                "volume `%wC'\n",
                &Descriptor->Name,
                Volume->DriveLetter);
    }

    /* Update the size after dump extraction */
    Descriptor->ActualMinSize = Descriptor->MinSize;
    Descriptor->ActualMaxSize = Descriptor->MaxSize;

    /* Check how big we can make the pagefile */
    Status = SmpGetPagingFileSize(&Descriptor->Name, &PageFileSize);
    if (NT_SUCCESS(Status) && PageFileSize.QuadPart > 0) ShouldDelete = TRUE;
    DPRINT("SMSS:PFILE: Detected size 0x%I64X for future paging file `%wZ'\n",
            PageFileSize,
            &Descriptor->Name);
    DPRINT("SMSS:PFILE: Free space on volume `%wC' is 0x%I64X\n",
            Volume->DriveLetter,
            Volume->FreeSpace.QuadPart);

    /* Now update our size and make sure none of these are too big */
    PageFileSize.QuadPart += Volume->FreeSpace.QuadPart;
    if (Descriptor->ActualMinSize.QuadPart > PageFileSize.QuadPart)
    {
        Descriptor->ActualMinSize = PageFileSize;
    }
    if (Descriptor->ActualMaxSize.QuadPart > PageFileSize.QuadPart)
    {
        Descriptor->ActualMaxSize = PageFileSize;
    }
    DPRINT("SMSS:PFILE: min 0x%I64X, max 0x%I64X, real min 0x%I64X\n",
            Descriptor->ActualMinSize.QuadPart,
            Descriptor->ActualMaxSize.QuadPart,
            MinimumSize->QuadPart);

    /* Keep going until we've created a pagefile of the right size */
    while (Descriptor->ActualMinSize.QuadPart >= MinimumSize->QuadPart)
    {
        /* Call NT to do it */
        Status = SmpCreatePagingFile(&Descriptor->Name,
                                     &Descriptor->ActualMinSize,
                                     &Descriptor->ActualMaxSize,
                                     0);
        if (NT_SUCCESS(Status))
        {
            /* We're done, update flags and increase the count */
            Descriptor->Flags |= SMP_PAGEFILE_CREATED;
            Volume->Flags |= SMP_VOLUME_PAGEFILE_CREATED;
            Volume->PageFileCount++;
            break;
        }

        /* We failed, try a slightly smaller pagefile */
        Descriptor->ActualMinSize.QuadPart -= FuzzFactor->QuadPart;
    }

    /* Check if we weren't able to create it */
    if (Descriptor->ActualMinSize.QuadPart < MinimumSize->QuadPart)
    {
        /* Delete the current page file and fail */
        if (ShouldDelete)
        {
            SmpDeletePagingFile(&Descriptor->Name);

            /* FIXFIX: Windows Vista does this, and it seems like we should too, so try to see if this fixes KVM */
            Volume->FreeSpace.QuadPart = PageFileSize.QuadPart;
        }
        DPRINT1("SMSS:PFILE: Failing for min 0x%I64X, max 0x%I64X, real min 0x%I64X\n",
                Descriptor->ActualMinSize.QuadPart,
                Descriptor->ActualMaxSize.QuadPart,
                MinimumSize->QuadPart);
        Status = STATUS_DISK_FULL;
    }

    /* Return the status */
    return Status;
}

Referenced by SmpCreatePagingFileOnAnyDrive(), SmpCreatePagingFiles(), and SmpCreateSystemManagedPagingFile().

SmpCreatePagingFiles()

NTSTATUS NTAPI SmpCreatePagingFiles

(

VOID

)

Definition at line 1049 of file pagefile.c.

{
    NTSTATUS Status;
    PSMP_PAGEFILE_DESCRIPTOR Descriptor;
    LARGE_INTEGER Size, FuzzFactor;
    BOOLEAN Created = FALSE;
    PLIST_ENTRY NextEntry;

    /* Check if no paging files were requested */
    if (!(SmpNumberOfPagingFiles) && !(SmpRegistrySpecifierPresent))
    {
        /* The list should be empty -- nothing to do */
        ASSERT(IsListEmpty(&SmpPagingFileDescriptorList));
        DPRINT1("SMSS:PFILE: No paging file was requested\n");
        return STATUS_SUCCESS;
    }

    /* Initialize the volume descriptors so we can know what's available */
    Status = SmpCreateVolumeDescriptors();
    if (!NT_SUCCESS(Status))
    {
        /* We can't make decisions without this, so fail */
        DPRINT1("SMSS:PFILE: Failed to create volume descriptors (status %X)\n",
                Status);
        return Status;
    }

    /* If we fail creating pagefiles, try to reduce by this much each time */
    FuzzFactor.QuadPart = FUZZ_FACTOR;

    /* Loop the descriptor list */
    NextEntry = SmpPagingFileDescriptorList.Flink;
    while (NextEntry != &SmpPagingFileDescriptorList)
    {
        /* Check what kind of descriptor this is */
        Descriptor = CONTAINING_RECORD(NextEntry, SMP_PAGEFILE_DESCRIPTOR, Entry);
        if (Descriptor->Flags & SMP_PAGEFILE_SYSTEM_MANAGED)
        {
            /* This is a system-managed descriptor. Create the correct file */
            DPRINT("SMSS:PFILE: Creating a system managed paging file (`%wZ')\n",
                    &Descriptor->Name);
            Status = SmpCreateSystemManagedPagingFile(Descriptor, FALSE);
            if (!NT_SUCCESS(Status))
            {
                /* We failed -- try again, with size minimization this time */
                DPRINT("SMSS:PFILE: Trying lower sizes for (`%wZ')\n",
                        &Descriptor->Name);
                Status = SmpCreateSystemManagedPagingFile(Descriptor, TRUE);
            }
        }
        else
        {
            /* This is a manually entered descriptor. Validate its size first */
            SmpValidatePagingFileSizes(Descriptor);

            /* Check if this is an ANY pagefile or a FIXED pagefile */
            DPRINT("SMSS:PFILE: Creating a normal paging file (`%wZ')\n",
                    &Descriptor->Name);
            if (Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET] == L'?')
            {
                /* It's an any pagefile, try to create it wherever possible */
                Size = Descriptor->MinSize;
                Status = SmpCreatePagingFileOnAnyDrive(Descriptor,
                                                       &FuzzFactor,
                                                       &Size);
                if (!NT_SUCCESS(Status))
                {
                    /* We failed to create it. Try again with a smaller size */
                    DPRINT("SMSS:PFILE: Trying lower sizes for (`%wZ')\n",
                            &Descriptor->Name);
                    Size.QuadPart = 16 * MEGABYTE;
                    Status = SmpCreatePagingFileOnAnyDrive(Descriptor,
                                                           &FuzzFactor,
                                                           &Size);
                }
            }
            else
            {
                /* It's a fixed pagefile: override the minimum and use ours */
                Size.QuadPart = 16 * MEGABYTE;
                Status = SmpCreatePagingFileOnFixedDrive(Descriptor,
                                                         &FuzzFactor,
                                                         &Size);
            }
        }

        /* Go to the next descriptor */
        if (NT_SUCCESS(Status)) Created = TRUE;
        NextEntry = NextEntry->Flink;
    }

    /* Check if none of the code in our loops above was able to create it */
    if (!Created)
    {
        /* Build an emergency pagefile ourselves */
        DPRINT1("SMSS:PFILE: Creating emergency paging file.\n");
        Status = SmpCreateEmergencyPagingFile();
    }

    /* All done */
    return Status;
}

Referenced by SmpLoadDataFromRegistry().

SmpCreateSystemManagedPagingFile()

NTSTATUS NTAPI SmpCreateSystemManagedPagingFile	(	IN PSMP_PAGEFILE_DESCRIPTOR	Descriptor,
		IN BOOLEAN	DecreaseSize
	)

Definition at line 801 of file pagefile.c.

{
    LARGE_INTEGER FuzzFactor, Size;

    /* Make sure there is at least 1 paging file and that we are system-managed */
    ASSERT(SmpNumberOfPagingFiles >= 1);
    ASSERT(!IsListEmpty(&SmpPagingFileDescriptorList));
    ASSERT(Descriptor->Flags & SMP_PAGEFILE_SYSTEM_MANAGED);

    /* Keep decreasing the pagefile by this amount if we run out of space */
    FuzzFactor.QuadPart = FUZZ_FACTOR;

    /* Create the descriptor for it (mainly the right sizes) and validate */
    SmpMakeSystemManagedPagingFileDescriptor(Descriptor);
    SmpValidatePagingFileSizes(Descriptor);

    /* Use either the minimum size in the descriptor, or 16 MB in minimal mode */
    Size.QuadPart = DecreaseSize ? 16 * MEGABYTE : Descriptor->MinSize.QuadPart;

    /* Check if this should be a fixed pagefile or an any pagefile */
    if (Descriptor->Name.Buffer[STANDARD_DRIVE_LETTER_OFFSET] == '?')
    {
        /* Find a disk for it */
        return SmpCreatePagingFileOnAnyDrive(Descriptor, &FuzzFactor, &Size);
    }

    /* Use the disk that was given */
    return SmpCreatePagingFileOnFixedDrive(Descriptor, &FuzzFactor, &Size);
}

Referenced by SmpCreateEmergencyPagingFile(), and SmpCreatePagingFiles().

SmpCreateVolumeDescriptors()

NTSTATUS NTAPI SmpCreateVolumeDescriptors

(

VOID

)

Definition at line 869 of file pagefile.c.

{
    NTSTATUS Status;
    UNICODE_STRING VolumePath;
    BOOLEAN BootVolumeFound = FALSE;
    WCHAR StartChar, Drive, DriveDiff;
    HANDLE VolumeHandle;
    OBJECT_ATTRIBUTES ObjectAttributes;
    IO_STATUS_BLOCK IoStatusBlock;
    PROCESS_DEVICEMAP_INFORMATION ProcessInformation;
    FILE_FS_DEVICE_INFORMATION DeviceInfo;
    FILE_FS_SIZE_INFORMATION SizeInfo;
    PSMP_VOLUME_DESCRIPTOR Volume;
    LARGE_INTEGER FreeSpace, FinalFreeSpace;
    WCHAR Buffer[32];

    /* We should be starting with an empty list */
    ASSERT(IsListEmpty(&SmpVolumeDescriptorList));

    /* Query the device map so we can get the drive letters */
    Status = NtQueryInformationProcess(NtCurrentProcess(),
                                       ProcessDeviceMap,
                                       &ProcessInformation.Query,
                                       sizeof(ProcessInformation.Query),
                                       NULL);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("SMSS:PFILE: Query(ProcessDeviceMap) failed with status %X\n",
                Status);
        return Status;
    }

    /* Build the volume string, starting with A: (we'll edit this in place) */
    wcscpy(Buffer, L"\\??\\A:\\");
    RtlInitUnicodeString(&VolumePath, Buffer);

    /* Start with the C drive, except on NEC PC-98 */
    StartChar = IsNEC_98 ? L'A' : L'C';
    for (Drive = StartChar, DriveDiff = StartChar - L'A'; Drive <= L'Z'; Drive++, DriveDiff++)
    {
        /* Skip the disk if it's not in the drive map */
        if (!((1 << DriveDiff) & ProcessInformation.Query.DriveMap)) continue;

        /* Write the drive letter and try to open the volume */
        VolumePath.Buffer[STANDARD_DRIVE_LETTER_OFFSET] = Drive;
        InitializeObjectAttributes(&ObjectAttributes,
                                   &VolumePath,
                                   OBJ_CASE_INSENSITIVE,
                                   NULL,
                                   NULL);
        Status = NtOpenFile(&VolumeHandle,
                            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))
        {
            /* Skip the volume if we failed */
            DPRINT1("SMSS:PFILE: Open volume `%wZ' failed with status %X\n",
                    &VolumePath, Status);
            continue;
        }

        /* Now query device information on the volume */
        Status = NtQueryVolumeInformationFile(VolumeHandle,
                                              &IoStatusBlock,
                                              &DeviceInfo,
                                              sizeof(DeviceInfo),
                                              FileFsDeviceInformation);
        if (!NT_SUCCESS(Status))
        {
            /* Move to the next volume if we failed */
            DPRINT1("SMSS:PFILE: Query volume `%wZ' (handle %p) for device info"
                    " failed with status %X\n",
                    &VolumePath,
                    VolumeHandle,
                    Status);
            NtClose(VolumeHandle);
            continue;
        }

        /* Check if this is a fixed disk */
        if (DeviceInfo.Characteristics & (FILE_FLOPPY_DISKETTE |
                                          FILE_READ_ONLY_DEVICE |
                                          FILE_REMOTE_DEVICE |
                                          FILE_REMOVABLE_MEDIA))
        {
            /* It isn't, so skip it */
            DPRINT1("SMSS:PFILE: Volume `%wZ' (%X) cannot store a paging file\n",
                    &VolumePath,
                    DeviceInfo.Characteristics);
            NtClose(VolumeHandle);
            continue;
        }

        /* We found a fixed volume, allocate a descriptor for it */
        Volume = RtlAllocateHeap(RtlGetProcessHeap(),
                                 HEAP_ZERO_MEMORY,
                                 sizeof(SMP_VOLUME_DESCRIPTOR));
        if (!Volume)
        {
            /* Failed to allocate memory, try the next disk */
            DPRINT1("SMSS:PFILE: Failed to allocate a volume descriptor (%u bytes)\n",
                    sizeof(SMP_VOLUME_DESCRIPTOR));
            NtClose(VolumeHandle);
            continue;
        }

        /* Save the drive letter and device information */
        Volume->DriveLetter = Drive;
        Volume->DeviceInfo = DeviceInfo;

        /* Check if this is the boot volume */
        if (RtlUpcaseUnicodeChar(Drive) ==
            RtlUpcaseUnicodeChar(SharedUserData->NtSystemRoot[0]))
        {
            /* Save it */
            ASSERT(BootVolumeFound == FALSE);
            Volume->Flags |= SMP_VOLUME_IS_BOOT;
            BootVolumeFound = TRUE;
        }

        /* Now get size information on the volume */
        Status = NtQueryVolumeInformationFile(VolumeHandle,
                                              &IoStatusBlock,
                                              &SizeInfo,
                                              sizeof(SizeInfo),
                                              FileFsSizeInformation);
        if (!NT_SUCCESS(Status))
        {
            /* We failed -- keep going */
            DPRINT1("SMSS:PFILE: Query volume `%wZ' (handle %p) for size failed"
                    " with status %X\n",
                    &VolumePath,
                    VolumeHandle,
                    Status);
            RtlFreeHeap(RtlGetProcessHeap(), 0, Volume);
            NtClose(VolumeHandle);
            continue;
        }

        /* Done querying volume information, close the handle */
        NtClose(VolumeHandle);

        /* Compute how much free space we have */
        FreeSpace.QuadPart = SizeInfo.AvailableAllocationUnits.QuadPart *
                             SizeInfo.SectorsPerAllocationUnit;
        FinalFreeSpace.QuadPart = FreeSpace.QuadPart * SizeInfo.BytesPerSector;

        /* Check if there is less than 32 MB free so we don't starve the disk */
        if (FinalFreeSpace.QuadPart <= MINIMUM_TO_KEEP_FREE)
        {
            /* In this case, act as if there is no free space */
            Volume->FreeSpace.QuadPart = 0;
        }
        else
        {
            /* Trim off 32 MB to give the disk a bit of breathing room */
            Volume->FreeSpace.QuadPart = FinalFreeSpace.QuadPart -
                                         MINIMUM_TO_KEEP_FREE;
        }

        /* All done, add this volume to our descriptor list */
        InsertTailList(&SmpVolumeDescriptorList, &Volume->Entry);
        Volume->Flags |= SMP_VOLUME_INSERTED;
        DPRINT("SMSS:PFILE: Created volume descriptor for`%wZ'\n", &VolumePath);
    }

    /* We must've found at least the boot volume */
    ASSERT(BootVolumeFound == TRUE);
    ASSERT(!IsListEmpty(&SmpVolumeDescriptorList));
    if (!IsListEmpty(&SmpVolumeDescriptorList)) return STATUS_SUCCESS;

    /* Something is really messed up if we found no disks at all */
    return STATUS_UNEXPECTED_IO_ERROR;
}

Referenced by SmpCreatePagingFiles().

SmpDeletePagingFile()

NTSTATUS NTAPI SmpDeletePagingFile

(

IN PUNICODE_STRING

FileName

)

Definition at line 340 of file pagefile.c.

{
    NTSTATUS Status;
    OBJECT_ATTRIBUTES ObjectAttributes;
    IO_STATUS_BLOCK IoStatusBlock;
    HANDLE FileHandle;
    FILE_DISPOSITION_INFORMATION Disposition;

    /* Open the page file */
    InitializeObjectAttributes(&ObjectAttributes,
                               FileName,
                               OBJ_CASE_INSENSITIVE,
                               NULL,
                               NULL);
    Status = NtOpenFile(&FileHandle,
                        DELETE,
                        &ObjectAttributes,
                        &IoStatusBlock,
                        FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
                        FILE_NON_DIRECTORY_FILE);
    if (NT_SUCCESS(Status))
    {
        /* Delete it */
        Disposition.DeleteFile = TRUE;
        Status = NtSetInformationFile(FileHandle,
                                      &IoStatusBlock,
                                      &Disposition,
                                      sizeof(Disposition),
                                      FileDispositionInformation);
        if (!NT_SUCCESS(Status))
        {
            DPRINT1("SMSS:PFILE: Failed to delete page file `%wZ' (status %X)\n",
                    FileName, Status);
        }
        else
        {
            DPRINT("SMSS:PFILE: Deleted stale paging file - %wZ\n", FileName);
        }

        /* Close the handle */
        NtClose(FileHandle);
    }
    else
    {
        DPRINT1("SMSS:PFILE: Failed to open for deletion page file `%wZ' (status %X)\n",
                FileName, Status);
    }

    /* All done */
    return Status;
}

Referenced by SmpCreatePagingFileOnFixedDrive().

SmpGetPagingFileSize()

NTSTATUS NTAPI SmpGetPagingFileSize	(	IN PUNICODE_STRING	FileName,
		OUT PLARGE_INTEGER	Size
	)

Definition at line 295 of file pagefile.c.

{
    NTSTATUS Status;
    OBJECT_ATTRIBUTES ObjectAttributes;
    IO_STATUS_BLOCK IoStatusBlock;
    HANDLE FileHandle;
    FILE_STANDARD_INFORMATION StandardInfo;

    DPRINT("SMSS:PFILE: Trying to get size for `%wZ'\n", FileName);
    Size->QuadPart = 0;

    InitializeObjectAttributes(&ObjectAttributes,
                               FileName,
                               OBJ_CASE_INSENSITIVE,
                               NULL,
                               NULL);
    Status = NtOpenFile(&FileHandle,
                        FILE_READ_ATTRIBUTES | SYNCHRONIZE,
                        &ObjectAttributes,
                        &IoStatusBlock,
                        FILE_SHARE_READ | FILE_SHARE_WRITE,
                        FILE_SYNCHRONOUS_IO_NONALERT);
    if (!NT_SUCCESS(Status)) return Status;

    Status = NtQueryInformationFile(FileHandle,
                                    &IoStatusBlock,
                                    &StandardInfo,
                                    sizeof(StandardInfo),
                                    FileStandardInformation);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("SMSS:PFILE: Failed query for size potential pagefile `%wZ' with status %X\n",
                FileName, Status);
        NtClose(FileHandle);
        return Status;
    }

    NtClose(FileHandle);
    Size->QuadPart = StandardInfo.AllocationSize.QuadPart;
    return STATUS_SUCCESS;
}

Referenced by SmpCreatePagingFileOnFixedDrive().

SmpGetVolumeFreeSpace()

NTSTATUS NTAPI SmpGetVolumeFreeSpace

(

IN PSMP_VOLUME_DESCRIPTOR

Volume

)

Definition at line 394 of file pagefile.c.

{
    NTSTATUS Status;
    LARGE_INTEGER FreeSpace, FinalFreeSpace;
    FILE_FS_SIZE_INFORMATION SizeInfo;
    IO_STATUS_BLOCK IoStatusBlock;
    OBJECT_ATTRIBUTES ObjectAttributes;
    UNICODE_STRING VolumeName;
    HANDLE VolumeHandle;
    WCHAR PathString[32];
    ASSERT(Volume->Flags & SMP_VOLUME_IS_BOOT); // ASSERT says "BootVolume == 1"

    /* Build the standard path */
    wcscpy(PathString, L"\\??\\A:\\");
    RtlInitUnicodeString(&VolumeName, PathString);
    VolumeName.Buffer[STANDARD_DRIVE_LETTER_OFFSET] = Volume->DriveLetter;
    DPRINT("SMSS:PFILE: Querying volume `%wZ' for free space\n", &VolumeName);

    /* Open the volume */
    InitializeObjectAttributes(&ObjectAttributes,
                               &VolumeName,
                               OBJ_CASE_INSENSITIVE,
                               NULL,
                               NULL);
    Status = NtOpenFile(&VolumeHandle,
                        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))
    {
        DPRINT1("SMSS:PFILE: Open volume `%wZ' failed with status %X\n", &VolumeName, Status);
        return Status;
    }

    /* Now get size information on the volume */
    Status = NtQueryVolumeInformationFile(VolumeHandle,
                                          &IoStatusBlock,
                                          &SizeInfo,
                                          sizeof(SizeInfo),
                                          FileFsSizeInformation);
    if (!NT_SUCCESS(Status))
    {
        /* We failed */
        DPRINT1("SMSS:PFILE: Query volume `%wZ' (handle %p) for size failed"
                " with status %X\n",
                &VolumeName,
                VolumeHandle,
                Status);
        NtClose(VolumeHandle);
        return Status;
    }
    NtClose(VolumeHandle);

    /* Compute how much free space we have */
    FreeSpace.QuadPart = SizeInfo.AvailableAllocationUnits.QuadPart *
                         SizeInfo.SectorsPerAllocationUnit;
    FinalFreeSpace.QuadPart = FreeSpace.QuadPart * SizeInfo.BytesPerSector;

    /* Check if there is less than 32 MB free so we don't starve the disk */
    if (FinalFreeSpace.QuadPart <= MINIMUM_TO_KEEP_FREE)
    {
        /* In this case, act as if there is no free space */
        Volume->FreeSpace.QuadPart = 0;
    }
    else
    {
        /* Trim off 32 MB to give the disk a bit of breathing room */
        Volume->FreeSpace.QuadPart = FinalFreeSpace.QuadPart -
                                     MINIMUM_TO_KEEP_FREE;
    }

    return STATUS_SUCCESS;
}

Referenced by SmpCreatePagingFileOnFixedDrive().

SmpMakeDefaultPagingFileDescriptor()

VOID NTAPI SmpMakeDefaultPagingFileDescriptor

(

IN PSMP_PAGEFILE_DESCRIPTOR

Descriptor

)

Definition at line 705 of file pagefile.c.

{
    /* The default descriptor uses 128 MB as a pagefile size */
    Descriptor->Flags |= SMP_PAGEFILE_DEFAULT;
    Descriptor->MinSize.QuadPart = 128 * MEGABYTE;
    Descriptor->MaxSize.QuadPart = 128 * MEGABYTE;
}

Referenced by SmpMakeSystemManagedPagingFileDescriptor().

SmpMakeSystemManagedPagingFileDescriptor()

VOID NTAPI SmpMakeSystemManagedPagingFileDescriptor

(

IN PSMP_PAGEFILE_DESCRIPTOR

Descriptor

)

Definition at line 715 of file pagefile.c.

{
    NTSTATUS Status;
    ULONGLONG MinimumSize, MaximumSize, Ram;
    SYSTEM_BASIC_INFORMATION BasicInfo;

    /* Query the page size of the system, and the amount of RAM */
    Status = NtQuerySystemInformation(SystemBasicInformation,
                                      &BasicInfo,
                                      sizeof(BasicInfo),
                                      NULL);
    if (!NT_SUCCESS(Status))
    {
        /* If we failed, use defaults since we have no idea otherwise */
        DPRINT1("SMSS:PFILE: NtQuerySystemInformation failed with %x\n", Status);
        SmpMakeDefaultPagingFileDescriptor(Descriptor);
        return;
    }

    /* Check how much RAM we have and set three times this amount as maximum */
    Ram = BasicInfo.NumberOfPhysicalPages * BasicInfo.PageSize;
    MaximumSize = 3 * Ram;

    /* If we have more than 1GB, use that as minimum, otherwise, use 1.5X RAM */
    MinimumSize = (Ram >= 1024 * MEGABYTE) ? Ram : MaximumSize / 2;

    /* Write the new sizes in the descriptor and mark it as system managed */
    Descriptor->MinSize.QuadPart = MinimumSize;
    Descriptor->MaxSize.QuadPart = MaximumSize;
    Descriptor->Flags |= SMP_PAGEFILE_SYSTEM_MANAGED;
}

Referenced by SmpCreateSystemManagedPagingFile().

SmpPagingFileInitialize()

VOID NTAPI SmpPagingFileInitialize

(

VOID

)

Definition at line 130 of file pagefile.c.

{
    /* Initialize the two lists */
    InitializeListHead(&SmpPagingFileDescriptorList);
    InitializeListHead(&SmpVolumeDescriptorList);
}

Referenced by SmpLoadDataFromRegistry().

SmpSearchVolumeDescriptor()

PSMP_VOLUME_DESCRIPTOR NTAPI SmpSearchVolumeDescriptor

(

IN WCHAR

DriveLetter

)

Definition at line 472 of file pagefile.c.

{
    WCHAR UpLetter;
    PSMP_VOLUME_DESCRIPTOR Volume = NULL;
    PLIST_ENTRY NextEntry;

    /* Use upper case to reduce differences */
    UpLetter = RtlUpcaseUnicodeChar(DriveLetter);

    /* Loop each volume */
    NextEntry = SmpVolumeDescriptorList.Flink;
    while (NextEntry != &SmpVolumeDescriptorList)
    {
        /* Grab the entry */
        Volume = CONTAINING_RECORD(NextEntry, SMP_VOLUME_DESCRIPTOR, Entry);

        /* Make sure it's a valid entry with an uppcase drive letter */
        ASSERT(Volume->Flags & SMP_VOLUME_INSERTED); // Volume->Initialized in ASSERT
        ASSERT(Volume->DriveLetter >= L'A' && Volume->DriveLetter <= L'Z');

        /* Break if it matches, if not, keep going */
        if (Volume->DriveLetter == UpLetter) break;
        NextEntry = NextEntry->Flink;
    }

    /* Return the volume if one was found */
    if (NextEntry == &SmpVolumeDescriptorList) Volume = NULL;
    return Volume;
}

Referenced by SmpCreatePagingFileOnFixedDrive().

SmpValidatePagingFileSizes()

NTSTATUS NTAPI SmpValidatePagingFileSizes

(

IN PSMP_PAGEFILE_DESCRIPTOR

Descriptor

)

Definition at line 749 of file pagefile.c.

{
    NTSTATUS Status = STATUS_SUCCESS;
    BOOLEAN WasTooBig = FALSE;
    ULONGLONG MinSize, MaxSize;
#ifdef _M_IX86
    ULONGLONG MaxPageFileSize =
        (SharedUserData->ProcessorFeatures[PF_PAE_ENABLED])
            ? MAXIMUM_PAGEFILE_SIZE_PAE : MAXIMUM_PAGEFILE_SIZE;
#else
    static const ULONGLONG MaxPageFileSize = MAXIMUM_PAGEFILE_SIZE;
#endif

    /* Capture the min and max */
    MinSize = Descriptor->MinSize.QuadPart;
    MaxSize = Descriptor->MaxSize.QuadPart;

    DPRINT("SMSS:PFILE: Validating sizes for `%wZ' 0x%I64X 0x%I64X\n",
            &Descriptor->Name, MinSize, MaxSize);

    /* Don't let minimum be bigger than maximum */
    if (MinSize > MaxSize)
        MaxSize = MinSize;

    /* Validate the minimum and maximum and trim them if they are too large */
    if (MinSize > MaxPageFileSize)
    {
        WasTooBig = TRUE;
        MinSize = MaxPageFileSize;
    }
    if (MaxSize > MaxPageFileSize)
    {
        WasTooBig = TRUE;
        MaxSize = MaxPageFileSize;
    }

    /* If we trimmed, write a flag in the descriptor */
    if (WasTooBig)
    {
        DPRINT("SMSS:PFILE: Trimmed size of `%wZ' to maximum allowed\n",
                &Descriptor->Name);
        Descriptor->Flags |= SMP_PAGEFILE_WAS_TOO_BIG;
    }

    /* Now write the (possibly trimmed) sizes back */
    Descriptor->MinSize.QuadPart = MinSize;
    Descriptor->MaxSize.QuadPart = MaxSize;
    return Status;
}

Referenced by SmpCreatePagingFiles(), and SmpCreateSystemManagedPagingFile().

Variable Documentation

SmpNumberOfPagingFiles

ULONG SmpNumberOfPagingFiles

Definition at line 124 of file pagefile.c.

Referenced by SmpCreateEmergencyPagingFile(), SmpCreatePagingFileDescriptor(), SmpCreatePagingFiles(), and SmpCreateSystemManagedPagingFile().

SmpPagingFileDescriptorList

LIST_ENTRY SmpPagingFileDescriptorList

Definition at line 122 of file pagefile.c.

Referenced by SmpCreateEmergencyPagingFile(), SmpCreatePagingFileDescriptor(), SmpCreatePagingFiles(), SmpCreateSystemManagedPagingFile(), and SmpPagingFileInitialize().

SmpRegistrySpecifierPresent

BOOLEAN SmpRegistrySpecifierPresent

Definition at line 123 of file pagefile.c.

Referenced by SmpCreatePagingFileDescriptor(), and SmpCreatePagingFiles().

SmpVolumeDescriptorList

LIST_ENTRY SmpVolumeDescriptorList

Definition at line 122 of file pagefile.c.

Referenced by SmpCreatePagingFileOnAnyDrive(), SmpCreateVolumeDescriptors(), SmpPagingFileInitialize(), and SmpSearchVolumeDescriptor().