December 2011
Intermediate to advanced
485 pages
15h 47m
English
Content preview from OS X and iOS Kernel ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The IOBlockStorageDevice Interface
The upper layers of the storage driver stack communicate with the transport driver through a class that is derived from the IOBlockStorageDevice interface. The IOBlockStorageDevice presents a view of the storage device as a linear array of logical blocks that can be either read from or written to by the caller. A logical block is the minimum number of bytes that the disk is capable of reading or writing, and a disk operation must operate on a multiple of blocks. Depending on the disk, the block size will be anywhere from 512 bytes to 4096 bytes. All operations performed by the IOBlockStorageDevice class work on a contiguous range of disk blocks.
The methods that must be implemented by a subclass of the IOBlockStorageDevice ...
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