things allows variable length messages to be easily supported.
- Extend KPI with alq_writen() and alq_getn() to support variable length
messages, which is enabled at ALQ creation time depending on the
arguments passed to alq_open(). Also add variants of alq_open() and
alq_post() that accept a flags argument. The KPI is still fully
backwards compatible and shouldn't require any change in ALQ consumers
unless they wish to utilise the new features.
- Introduce the ALQ_NOACTIVATE and ALQ_ORDERED flags to allow ALQ consumers
to have more control over IO scheduling and resource acquisition
respectively.
- Strengthen invariants checking.
- Document ALQ changes in ALQ(9) man page.
Sponsored by: FreeBSD Foundation
Reviewed by: gnn, jeff, rpaulo, rwatson
MFC after: 1 month
than defaulting the cmode argument to vn_open() to 0. Supply a default
argument of ALQ_DEFAULT_CMODE (0600) in current callers.
Discussed with/pointed out by: hmp
Reveiwed by: jeff, hmp
MFC after: 3 days
The manual page contains enough information to get someone started
with ALQ.
MLINKS have been added appropriately.
Approved by: jeff, des
Reviewed by: des, jeff, sam, brooks, rwatson, mtm
