K 10
svn:author
V 7
rwatson
K 8
svn:date
V 27
2002-04-19T13:46:24.000000Z
K 7
svn:log
V 708
In sendfile(), use the vn_rdwr() helper function, rather than manually
constructing a struct aio and invoking VOP_READ() directly.  This cleans
up the code a little, but also has the advantage of making sure almost
all vnode read/write access in the kernel goes through the helper
function, meaning that instrumentation of that helper function can impact
almost all relevant read/write operations.  In this case, it permits us
to put MAC hooks into vn_rdwr() and not modify uipc_syscalls.c (yet).

In general, if helper vn_*() functions exist, they should be used in
preference to direct VOP's in system call service code.

Submitted by:	green
Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, NAI Labs

END