K 10
svn:author
V 7
asomers
K 8
svn:date
V 27
2019-07-17T17:01:07.115627Z
K 7
svn:log
V 392
F_READAHEAD: Fix r349248's overflow protection, broken by r349391

I accidentally broke the main point of r349248 when making stylistic changes
in r349391.  Restore the original behavior, and also fix an additional
overflow that was possible when uio->uio_resid was nearly SSIZE_MAX.

Reported by:	cem
Reviewed by:	bde
MFC after:	2 weeks
MFC-With:	349248
Sponsored by:	The FreeBSD Foundation

END