April 2012
Intermediate to advanced
352 pages
8h
English
Content preview from FreeBSD Device DriversBecome 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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Block Drivers Are Gone
As mentioned previously, block devices transfer randomly accessible data in fixed-size blocks; for example, disk drives. Naturally, block drivers provide access to block devices. Block drivers are characterized by the fact that all I/O is cached within the kernel’s buffer cache, which makes block drivers unreliable, for two reasons. First, because caching can reorder a sequence of write operations, it deprives the writing process of the ability to identify the exact disk contents at any moment in time. This makes reliable crash recovery of on-disk data structures (for example, filesystems) impossible. Second, caching can delay write operations. So if an error occurs, the kernel cannot report to the process that did the write ...
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