commit 1031bc589228ca35b3b6fb3dfe4656c0da5fbeb4
author Dmitry Monakhov <dmonakhov@openvz.org> Mon Apr 13 16:31:35 2015 +0400
committer Al Viro <viro@zeniv.linux.org.uk> Wed Jan 06 12:55:29 2016 -0500
tree 52ad94e769ee16491c9db4e9904ac266292e4996
parent 424081f3c881ca3aef50cfa571e91863c10d952a

lib/vsprintf: add %*pg format specifier

This allow to directly print block_device name.
Currently one should use bdevname() with temporal char buffer.
This is very ineffective because bloat stack usage for deep IO call-traces

Example:
	%pg  ->    sda, sda1 or loop0p1

[AV: fixed a minor braino - position updates should not be dependent
upon having reached the of buffer]

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>