K 10
svn:author
V 4
will
K 8
svn:date
V 27
2015-04-11T18:51:41.704445Z
K 7
svn:log
V 446
uiomove_object_page(): Avoid instantiating pages in sparse regions on reads.

Check whether the page being requested is either resident or on swap.  If
not, read from the zero_region instead of instantiating an unnecessary page.

This avoids consuming memory for sparse files on tmpfs, when they are read
by applications that do not use SEEK_HOLE/SEEK_DATA (which is most of them).

Reviewed by:	kib
MFC after:	1 week
Sponsored by:	Spectra Logic

END