Bruce M Simpson wrote:
Much network code needs to know if the mbuf it is looking at is using
a cluster. I propose putting M_HASCL() in sys/mbuf.h. I realise this
is a style change, however, it seems to be a very common idiom.
I sent this, then I looked at NetBSD, having caught a glimpse of their
MBUFTRACE code when skimming lots of diffs. That is also a good idea,
and might help us catch problems before they go prime-time; I've added
it to the wiki.
Point there is, M_HASCL() seems to be a hangover from the 4.4BSD era.
NetBSD seems to treat clusters and external storage as separate
entities. So I'm reconsidering this in the light of this new evidence.
As far as I understand it, the presence of M_EXT in an mbuf chain's
header in FreeBSD always indicate that we are using external storage
(not necessarily, but possibly, a cluster).
Can someone confirm this?
Regards,
BMS
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