kernel

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• Constants

Constants

const MaxReadAhead = 512 * 1024

MaxReadAhead configures the kernel's maximum readahead for file handles on this FUSE mount (via ConfigureMount) and our corresponding "trailing" buffer.

Our sizingHandle implements Read operations for read-only fsctx.File objects that don't support random access or seeking. Generally this requires that the user reading such a file does so in-order. However, the kernel attempts to optimize i/o speed by reading ahead into the page cache and to do so it can issue concurrent reads for a few blocks ahead of the user's current position. We respond to such requests from our trailing buffer. TODO: Choose a value more carefully. This value was chosen fairly roughly based on some articles/discussion that suggested this was a kernel default.