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loader: want mechanism to avoid RA with bcache

Authored by tsoome on Mar 29 2017, 6:11 PM.



While we have mechanisms in place to protect ourselves against the read
behind the disk end, there is still one corner case. As the GPT
partition table has backup table at the end of the disk, and we yet
do not know the size of the disk (if the wrong size is provided by the
firmware/bios), we need to limit the reads to avoid read ahead in such case.

Test Plan

Tested the build + boot.

Diff Detail

rS FreeBSD src repository - subversion
Automatic diff as part of commit; lint not applicable.
Automatic diff as part of commit; unit tests not applicable.

Event Timeline

This revision is now accepted and ready to land.Apr 6 2017, 3:09 PM
This revision was automatically updated to reflect the committed changes.