K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2020-02-20T16:58:19.123102Z
K 7
svn:log
V 526
vfs: add realpathat syscall

realpath(3) is used a lot e.g., by clang and is a major source of getcwd
and fstatat calls. This can be done more efficiently in the kernel.

This works by performing a regular lookup while saving the name and found
parent directory. If the terminal vnode is a directory we can resolve it using
usual means. Otherwise we can use the name saved by lookup and resolve the
parent.

See the review for sample syscall counts.

Reviewed by:	kib
Differential Revision:	https://reviews.freebsd.org/D23574

END