K 10
svn:author
V 3
cem
K 8
svn:date
V 27
2020-07-31T00:07:01.354187Z
K 7
svn:log
V 473
getblk: Avoid sleeping on wrong buf in lockless path

If the buffer identity changed during lookup, sleeping could introduce a
lock order reversal.  Since we do not know if the identity changed until we
get the lock, we must try-lock (LK_NOWAIT) only.  EINTR and ERESTART error
handling becomes irrelevant, as we no longer sleep.

Reported by:	kib
Reviewed by:	kib
X-MFC-With:	r363482
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D25898

END