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FS_BPIO_OPERATIONS enumeration (ntifs.h)

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

Syntax

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;

Constants

 
FS_BPIO_OP_ENABLE
Value: 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
Value: 2
Informs filters and file systems that BypassIO is being disabled on the specified file.
FS_BPIO_OP_QUERY
Value: 3
Queries whether BypassIO can be enabled for the given file.
FS_BPIO_OP_VOLUME_STACK_PAUSE
Value: 4
Requests that BypassIO be paused on the specified volume/storage stack.
FS_BPIO_OP_VOLUME_STACK_RESUME
Value: 5
Requests that BypassIO processing be resumed on the given volume.
FS_BPIO_OP_STREAM_PAUSE
Value: 6
Requests that BypassIO processing be paused on a stream.
FS_BPIO_OP_STREAM_RESUME
Value: 7
Requests that BypassIO processing be resumed on a stream.
FS_BPIO_OP_GET_INFO
Value: 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.

Requirements

Requirement Value
Minimum supported client Windows 11
Header ntifs.h

See also

FSCTL_MANAGE_BYPASS_IO