FS_BPIO_OPERATIONS - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// ntifs.h

typedef enum _FS_BPIO_OPERATIONS {
  FS_BPIO_OP_ENABLE = 1,
  FS_BPIO_OP_DISABLE = 2,
  FS_BPIO_OP_QUERY = 3,
  FS_BPIO_OP_VOLUME_STACK_PAUSE = 4,
  FS_BPIO_OP_VOLUME_STACK_RESUME = 5,
  FS_BPIO_OP_STREAM_PAUSE = 6,
  FS_BPIO_OP_STREAM_RESUME = 7,
  FS_BPIO_OP_GET_INFO = 8,
  FS_BPIO_OP_MAX_OPERATION
} FS_BPIO_OPERATIONS;
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Windows Driver Kit DDI reference (ne-ntifs-fs_bpio_operations)

Description

FS_BPIO_OPERATIONS defines the various BypassIO operations supported by the FSCTL_MANAGE_BYPASS_IO control code.

Constants

FS_BPIO_OP_ENABLE:1

Requests that BypassIO be enabled for the given file, which means a driver might not see all non-cached reads for that file.

FS_BPIO_OP_DISABLE:2

Informs filters and file systems that BypassIO is being disabled on the specified file.

FS_BPIO_OP_QUERY:3

Queries whether BypassIO can be enabled for the given file.

FS_BPIO_OP_VOLUME_STACK_PAUSE:4

Requests that BypassIO be paused on the specified volume/storage stack.

FS_BPIO_OP_VOLUME_STACK_RESUME:5

Requests that BypassIO processing be resumed on the given volume.

FS_BPIO_OP_STREAM_PAUSE:6

Requests that BypassIO processing be paused on a stream.

FS_BPIO_OP_STREAM_RESUME:7

Requests that BypassIO processing be resumed on a stream.

FS_BPIO_OP_GET_INFO:8

Requests information about the BypassIO state of the volume.

FS_BPIO_OP_MAX_OPERATION

Valid BypassIO operation values are less than this value.

Remarks

See BypassIO for filter drivers and Supporting BypassIO operations for more information.

See also

FSCTL_MANAGE_BYPASS_IO

View the official Windows Driver Kit DDI reference

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