K 10
svn:author
V 3
avg
K 8
svn:date
V 27
2013-07-09T08:47:11.245240Z
K 7
svn:log
V 226
zfs: try to properly handle i/o errors in mappedread_sf

Unconditionally freeing a page is not good, especially if it is the page
that was wired by the caller.  The checks are picked up from
kern_sendfile.

MFC after:	3 weeks

END