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constrainByteCount

Constrain the byte count for this IO to device limits.

Declaration

virtual UInt64 constrainByteCount(
 UInt64requestedCount,
 boolisWrite);

Parameters

  • requestedCount:

    The requested byte count for the next read or write operation.

  • isWrite:

    True if the operation will be a write; False if the operation will be a read.

Overview

This function should be called prior to each read or write operation, so that the driver can constrain the requested byte count, as necessary, to meet current device limits. Such limits could be imposed by the device depending on operating modes, media types, or transport protocol (e.g. ATA, SCSI).

At present, this method is not used.

See Also

Miscellaneous