https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193146
Bug ID: 193146
Summary: [PATCH] getblk: Assert that bsize is non-zero
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: Needs Triage
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 146535
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=146535&action=edit
(Applies to CURRENT with -p0.)
If !vn_isdisk(vp) and bo_bsize is zero, getblk() will calculate offsets for
different blknos as zero, and create multiple bufs pointing at the same section
of VM object (due to offset being zero). As you might imagine, this is pretty
bad.
This patch attempts to head off developer errors like bo_bsize == 0 quickly
with a KASSERT.
Sponsored by: EMC / Isilon storage division
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