Date: Mon, 10 Apr 2006 12:41:18 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/kern kern_shutdown.c src/sys/vm swap_pager.c swap_pager.h Message-ID: <20060410104118.GD3728@garage.freebsd.pl> In-Reply-To: <200604101003.k3AA3iMK023510@repoman.freebsd.org> References: <200604101003.k3AA3iMK023510@repoman.freebsd.org>
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On Mon, Apr 10, 2006 at 10:03:41AM +0000, Pawel Jakub Dawidek wrote:
+> pjd 2006-04-10 10:03:41 UTC
+>=20
+> FreeBSD src repository
+>=20
+> Modified files:
+> sys/kern kern_shutdown.c=20
+> sys/vm swap_pager.c swap_pager.h=20
+> Log:
+> On shutdown try to turn off all swap devices. This way GEOM providers =
are
+> properly closed on shutdown.
The hard situation to solve is when we have, eg. file-backed md(4)
devices which we use as a swap device. We can also configure swap-backed
md(4) device and create and mount file system on it.
To solve such complex scenario we need to reimplement vfs_unmountall()
and swapoff_all() to return number of unmounted file system (removed
swap devices) and do something like:
vfs_unmountall();
swapoff_all();
for (;;) {
n =3D vfs_unmountall();
if (n =3D=3D 0)
break;
n =3D swapoff_all();
if (n =3D=3D 0)
break;
}
--=20
Pawel Jakub Dawidek http://www.wheel.pl
pjd@FreeBSD.org http://www.FreeBSD.org
FreeBSD committer Am I Evil? Yes, I Am!
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