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[BTRFS] Fix booting with runtime checks

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This commit is contained in:
Mark Jansen 2018-08-21 07:05:40 +02:00 committed by Pierre Schweitzer
parent e97b95cc2e
commit 6c75215bb3
10 changed files with 89 additions and 24 deletions
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65
drivers/filesystems/btrfs/btrfs.c
View file

@ -464,7 +464,11 @@ BOOL get_xattr(_In_ _Requires_lock_held_(_Curr_->tree_lock) device_extension* Vc
_Dispatch_type_(IRP_MJ_CLOSE)
_Function_class_(DRIVER_DISPATCH)
#ifdef __REACTOS__
static NTSTATUS NTAPI drv_close(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#else
static NTSTATUS drv_close(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#endif
NTSTATUS Status;
PIO_STACK_LOCATION IrpSp;
device_extension* Vcb = DeviceObject->DeviceExtension;
@ -513,7 +517,11 @@ end:
_Dispatch_type_(IRP_MJ_FLUSH_BUFFERS)
_Function_class_(DRIVER_DISPATCH)
#ifdef __REACTOS__
static NTSTATUS NTAPI drv_flush_buffers(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#else
static NTSTATUS drv_flush_buffers(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#endif
NTSTATUS Status;
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation( Irp );
PFILE_OBJECT FileObject = IrpSp->FileObject;
@ -708,7 +716,11 @@ static BOOL lie_about_fs_type() {
_Dispatch_type_(IRP_MJ_QUERY_VOLUME_INFORMATION)
_Function_class_(DRIVER_DISPATCH)
#ifdef __REACTOS__
static NTSTATUS NTAPI drv_query_volume_information(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#else
static NTSTATUS drv_query_volume_information(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#endif
PIO_STACK_LOCATION IrpSp;
NTSTATUS Status;
ULONG BytesCopied = 0;
@ -1147,7 +1159,11 @@ end:
_Dispatch_type_(IRP_MJ_SET_VOLUME_INFORMATION)
_Function_class_(DRIVER_DISPATCH)
#ifdef __REACTOS__
static NTSTATUS NTAPI drv_set_volume_information(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#else
static NTSTATUS drv_set_volume_information(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#endif
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
device_extension* Vcb = DeviceObject->DeviceExtension;
NTSTATUS Status;
@ -2129,7 +2145,11 @@ NTSTATUS delete_fileref(_In_ file_ref* fileref, _In_opt_ PFILE_OBJECT FileObject
_Dispatch_type_(IRP_MJ_CLEANUP)
_Function_class_(DRIVER_DISPATCH)
#ifdef __REACTOS__
static NTSTATUS NTAPI drv_cleanup(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#else
static NTSTATUS drv_cleanup(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#endif
NTSTATUS Status;
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
PFILE_OBJECT FileObject = IrpSp->FileObject;
@ -4768,7 +4788,11 @@ static NTSTATUS verify_volume(_In_ PDEVICE_OBJECT devobj) {
_Dispatch_type_(IRP_MJ_FILE_SYSTEM_CONTROL)
_Function_class_(DRIVER_DISPATCH)
#ifdef __REACTOS__
static NTSTATUS NTAPI drv_file_system_control(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#else
static NTSTATUS drv_file_system_control(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#endif
PIO_STACK_LOCATION IrpSp;
NTSTATUS Status;
device_extension* Vcb = DeviceObject->DeviceExtension;
@ -4849,7 +4873,11 @@ end:
_Dispatch_type_(IRP_MJ_LOCK_CONTROL)
_Function_class_(DRIVER_DISPATCH)
#ifdef __REACTOS__
static NTSTATUS NTAPI drv_lock_control(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#else
static NTSTATUS drv_lock_control(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#endif
NTSTATUS Status;
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
fcb* fcb = IrpSp->FileObject->FsContext;
@ -4888,7 +4916,11 @@ exit:
_Dispatch_type_(IRP_MJ_SHUTDOWN)
_Function_class_(DRIVER_DISPATCH)
#ifdef __REACTOS__
static NTSTATUS NTAPI drv_shutdown(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#else
static NTSTATUS drv_shutdown(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#endif
NTSTATUS Status;
BOOL top_level;
device_extension* Vcb = DeviceObject->DeviceExtension;
@ -5010,7 +5042,11 @@ end:
_Dispatch_type_(IRP_MJ_POWER)
_Function_class_(DRIVER_DISPATCH)
#ifdef __REACTOS__
static NTSTATUS NTAPI drv_power(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#else
static NTSTATUS drv_power(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#endif
NTSTATUS Status;
device_extension* Vcb = DeviceObject->DeviceExtension;
BOOL top_level;
@ -5051,7 +5087,11 @@ exit:
_Dispatch_type_(IRP_MJ_SYSTEM_CONTROL)
_Function_class_(DRIVER_DISPATCH)
#ifdef __REACTOS__
static NTSTATUS NTAPI drv_system_control(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#else
static NTSTATUS drv_system_control(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
#endif
NTSTATUS Status;
device_extension* Vcb = DeviceObject->DeviceExtension;
BOOL top_level;
@ -5580,6 +5620,30 @@ NTSTATUS DriverEntry(_In_ PDRIVER_OBJECT DriverObject, _In_ PUNICODE_STRING Regi
DriverObject->DriverExtension->AddDevice = AddDevice;
#ifdef __REACTOS__
DriverObject->MajorFunction[IRP_MJ_CREATE] = drv_create;
DriverObject->MajorFunction[IRP_MJ_CLOSE] = drv_close;
DriverObject->MajorFunction[IRP_MJ_READ] = drv_read;
DriverObject->MajorFunction[IRP_MJ_WRITE] = drv_write;
DriverObject->MajorFunction[IRP_MJ_QUERY_INFORMATION] = drv_query_information;
DriverObject->MajorFunction[IRP_MJ_SET_INFORMATION] = drv_set_information;
DriverObject->MajorFunction[IRP_MJ_QUERY_EA] = drv_query_ea;
DriverObject->MajorFunction[IRP_MJ_SET_EA] = drv_set_ea;
DriverObject->MajorFunction[IRP_MJ_FLUSH_BUFFERS] = drv_flush_buffers;
DriverObject->MajorFunction[IRP_MJ_QUERY_VOLUME_INFORMATION] = drv_query_volume_information;
DriverObject->MajorFunction[IRP_MJ_SET_VOLUME_INFORMATION] = drv_set_volume_information;
DriverObject->MajorFunction[IRP_MJ_DIRECTORY_CONTROL] = drv_directory_control;
DriverObject->MajorFunction[IRP_MJ_FILE_SYSTEM_CONTROL] = drv_file_system_control;
DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] = drv_device_control;
DriverObject->MajorFunction[IRP_MJ_SHUTDOWN] = drv_shutdown;
DriverObject->MajorFunction[IRP_MJ_LOCK_CONTROL] = drv_lock_control;
DriverObject->MajorFunction[IRP_MJ_CLEANUP] = drv_cleanup;
DriverObject->MajorFunction[IRP_MJ_QUERY_SECURITY] = drv_query_security;
DriverObject->MajorFunction[IRP_MJ_SET_SECURITY] = drv_set_security;
DriverObject->MajorFunction[IRP_MJ_POWER] = drv_power;
DriverObject->MajorFunction[IRP_MJ_SYSTEM_CONTROL] = drv_system_control;
DriverObject->MajorFunction[IRP_MJ_PNP] = drv_pnp;
#else
DriverObject->MajorFunction[IRP_MJ_CREATE] = (PDRIVER_DISPATCH)drv_create;
DriverObject->MajorFunction[IRP_MJ_CLOSE] = (PDRIVER_DISPATCH)drv_close;
DriverObject->MajorFunction[IRP_MJ_READ] = (PDRIVER_DISPATCH)drv_read;
@ -5602,6 +5666,7 @@ NTSTATUS DriverEntry(_In_ PDRIVER_OBJECT DriverObject, _In_ PUNICODE_STRING Regi
DriverObject->MajorFunction[IRP_MJ_POWER] = (PDRIVER_DISPATCH)drv_power;
DriverObject->MajorFunction[IRP_MJ_SYSTEM_CONTROL] = (PDRIVER_DISPATCH)drv_system_control;
DriverObject->MajorFunction[IRP_MJ_PNP] = (PDRIVER_DISPATCH)drv_pnp;
#endif
init_fast_io_dispatch(&DriverObject->FastIoDispatch);

24
drivers/filesystems/btrfs/btrfs_drv.h
View file

@ -1282,7 +1282,7 @@ void free_write_data_stripes(write_data_context* wtc);
_Dispatch_type_(IRP_MJ_WRITE)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_write(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS NTAPI drv_write(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
_Requires_lock_held_(c->lock)
_When_(return != 0, _Releases_lock_(c->lock))
@ -1304,7 +1304,7 @@ void add_extent(_In_ fcb* fcb, _In_ LIST_ENTRY* prevextle, _In_ __drv_aliasesMem
_Dispatch_type_(IRP_MJ_DIRECTORY_CONTROL)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_directory_control(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS NTAPI drv_directory_control(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
ULONG get_reparse_tag(device_extension* Vcb, root* subvol, UINT64 inode, UINT8 type, ULONG atts, BOOL lxss, PIRP Irp);
@ -1312,11 +1312,11 @@ ULONG get_reparse_tag(device_extension* Vcb, root* subvol, UINT64 inode, UINT8 t
_Dispatch_type_(IRP_MJ_QUERY_SECURITY)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_query_security(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS NTAPI drv_query_security(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
_Dispatch_type_(IRP_MJ_SET_SECURITY)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_set_security(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS NTAPI drv_set_security(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
void fcb_get_sd(fcb* fcb, struct _fcb* parent, BOOL look_for_xattr, PIRP Irp);
void add_user_mapping(WCHAR* sidstring, ULONG sidstringlength, UINT32 uid);
@ -1330,19 +1330,19 @@ void find_gid(struct _fcb* fcb, struct _fcb* parfcb, PSECURITY_SUBJECT_CONTEXT s
_Dispatch_type_(IRP_MJ_SET_INFORMATION)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_set_information(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS NTAPI drv_set_information(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
_Dispatch_type_(IRP_MJ_QUERY_INFORMATION)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_query_information(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS NTAPI drv_query_information(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
_Dispatch_type_(IRP_MJ_QUERY_EA)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_query_ea(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS NTAPI drv_query_ea(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
_Dispatch_type_(IRP_MJ_SET_EA)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_set_ea(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS NTAPI drv_set_ea(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
BOOL has_open_children(file_ref* fileref);
NTSTATUS stream_set_end_of_file_information(device_extension* Vcb, UINT16 end, fcb* fcb, file_ref* fileref, BOOL advance_only);
@ -1360,7 +1360,7 @@ NTSTATUS delete_reparse_point(PDEVICE_OBJECT DeviceObject, PIRP Irp);
_Dispatch_type_(IRP_MJ_CREATE)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_create(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS NTAPI drv_create(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS open_fileref(_Requires_lock_held_(_Curr_->tree_lock) _Requires_exclusive_lock_held_(_Curr_->fcb_lock) _In_ device_extension* Vcb, _Out_ file_ref** pfr,
_In_ PUNICODE_STRING fnus, _In_opt_ file_ref* related, _In_ BOOL parent, _Out_opt_ USHORT* parsed, _Out_opt_ ULONG* fn_offset, _In_ POOL_TYPE pooltype,
@ -1412,7 +1412,7 @@ NTSTATUS update_dev_item(device_extension* Vcb, device* device, PIRP Irp);
_Dispatch_type_(IRP_MJ_READ)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_read(PDEVICE_OBJECT DeviceObject, PIRP Irp);
NTSTATUS NTAPI drv_read(PDEVICE_OBJECT DeviceObject, PIRP Irp);
NTSTATUS read_data(_In_ device_extension* Vcb, _In_ UINT64 addr, _In_ UINT32 length, _In_reads_bytes_opt_(length*sizeof(UINT32)/Vcb->superblock.sector_size) UINT32* csum,
_In_ BOOL is_tree, _Out_writes_bytes_(length) UINT8* buf, _In_opt_ chunk* c, _Out_opt_ chunk** pc, _In_opt_ PIRP Irp, _In_ UINT64 generation, _In_ BOOL file_read,
@ -1427,7 +1427,7 @@ void raid6_recover2(UINT8* sectors, UINT16 num_stripes, ULONG sector_size, UINT1
_Dispatch_type_(IRP_MJ_PNP)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_pnp(PDEVICE_OBJECT DeviceObject, PIRP Irp);
NTSTATUS NTAPI drv_pnp(PDEVICE_OBJECT DeviceObject, PIRP Irp);
NTSTATUS pnp_surprise_removal(PDEVICE_OBJECT DeviceObject, PIRP Irp);
NTSTATUS pnp_query_remove_device(PDEVICE_OBJECT DeviceObject, PIRP Irp);
@ -1492,7 +1492,7 @@ UINT8 gdiv(UINT8 a, UINT8 b);
_Dispatch_type_(IRP_MJ_DEVICE_CONTROL)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_device_control(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS NTAPI drv_device_control(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
// in calcthread.c

2
drivers/filesystems/btrfs/create.c
View file

@ -3685,7 +3685,7 @@ static BOOL has_manage_volume_privilege(ACCESS_STATE* access_state, KPROCESSOR_M
_Dispatch_type_(IRP_MJ_CREATE)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_create(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
NTSTATUS NTAPI drv_create(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
NTSTATUS Status;
PIO_STACK_LOCATION IrpSp;
device_extension* Vcb = DeviceObject->DeviceExtension;

2
drivers/filesystems/btrfs/devctrl.c
View file

@ -236,7 +236,7 @@ static NTSTATUS control_ioctl(PIRP Irp) {
_Dispatch_type_(IRP_MJ_DEVICE_CONTROL)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_device_control(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
NTSTATUS NTAPI drv_device_control(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
NTSTATUS Status;
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
device_extension* Vcb = DeviceObject->DeviceExtension;

2
drivers/filesystems/btrfs/dirctrl.c
View file

@ -1003,7 +1003,7 @@ end:
_Dispatch_type_(IRP_MJ_DIRECTORY_CONTROL)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_directory_control(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
NTSTATUS NTAPI drv_directory_control(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
PIO_STACK_LOCATION IrpSp;
NTSTATUS Status;
ULONG func;

8
drivers/filesystems/btrfs/fileinfo.c
View file

@ -2557,7 +2557,7 @@ end:
_Dispatch_type_(IRP_MJ_SET_INFORMATION)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_set_information(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
NTSTATUS NTAPI drv_set_information(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
NTSTATUS Status;
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
device_extension* Vcb = DeviceObject->DeviceExtension;
@ -3919,7 +3919,7 @@ exit:
_Dispatch_type_(IRP_MJ_QUERY_INFORMATION)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_query_information(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
NTSTATUS NTAPI drv_query_information(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
PIO_STACK_LOCATION IrpSp;
NTSTATUS Status;
fcb* fcb;
@ -3967,7 +3967,7 @@ end:
_Dispatch_type_(IRP_MJ_QUERY_EA)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_query_ea(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
NTSTATUS NTAPI drv_query_ea(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
NTSTATUS Status;
BOOL top_level;
device_extension* Vcb = DeviceObject->DeviceExtension;
@ -4203,7 +4203,7 @@ typedef struct {
_Dispatch_type_(IRP_MJ_SET_EA)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_set_ea(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
NTSTATUS NTAPI drv_set_ea(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
device_extension* Vcb = DeviceObject->DeviceExtension;
NTSTATUS Status;
BOOL top_level;

2
drivers/filesystems/btrfs/pnp.c
View file

@ -491,7 +491,7 @@ static NTSTATUS pdo_pnp(PDEVICE_OBJECT pdo, PIRP Irp) {
_Dispatch_type_(IRP_MJ_PNP)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_pnp(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
NTSTATUS NTAPI drv_pnp(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
device_extension* Vcb = DeviceObject->DeviceExtension;
NTSTATUS Status;

2
drivers/filesystems/btrfs/read.c
View file

@ -3237,7 +3237,7 @@ NTSTATUS do_read(PIRP Irp, BOOLEAN wait, ULONG* bytes_read) {
_Dispatch_type_(IRP_MJ_READ)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_read(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
NTSTATUS NTAPI drv_read(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
device_extension* Vcb = DeviceObject->DeviceExtension;
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
PFILE_OBJECT FileObject = IrpSp->FileObject;

4
drivers/filesystems/btrfs/security.c
View file

@ -578,7 +578,7 @@ static NTSTATUS get_file_security(PFILE_OBJECT FileObject, SECURITY_DESCRIPTOR*
_Dispatch_type_(IRP_MJ_QUERY_SECURITY)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_query_security(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
NTSTATUS NTAPI drv_query_security(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
NTSTATUS Status;
SECURITY_DESCRIPTOR* sd;
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
@ -743,7 +743,7 @@ end:
_Dispatch_type_(IRP_MJ_SET_SECURITY)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_set_security(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
NTSTATUS NTAPI drv_set_security(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
NTSTATUS Status;
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
PFILE_OBJECT FileObject = IrpSp->FileObject;

2
drivers/filesystems/btrfs/write.c
View file

@ -4690,7 +4690,7 @@ exit:
_Dispatch_type_(IRP_MJ_WRITE)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_write(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
NTSTATUS NTAPI drv_write(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
NTSTATUS Status;
BOOL top_level;
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);