CVS log for src/sys/sys/xio.h

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Keyword substitution: kv
Default branch: MAIN
Current tag: DragonFly_Stable

Clean up the XIO API and structure.  XIO no longer tries to 'track' partial
copies into or out of an XIO.  It no longer adjusts xio_offset or xio_bytes
once they have been initialized.  Instead, a relative offset is now passed
to API calls to handle partial copies.  This makes the API a lot less confusing
and makes the XIO structure a lot more flexible, shareable, and more suitable
for use by higher level entities (buffer cache, pipe code, upcoming MSFBUF
work, etc).