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geom_vfs: lock devvp in g_vfs_close()

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It is needed for g_vfs_close() invalidating the buffers.  We rely on the
vnode lock for correctness.

Reported and tested by:	pho
Reviewed by:	markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D32761
This commit is contained in:
Konstantin Belousov 2021-11-01 07:46:52 +02:00
parent df07bfda67
commit 8db7d16526
1 changed files with 4 additions and 0 deletions
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4
sys/geom/geom_vfs.c
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@ -302,12 +302,16 @@ g_vfs_close(struct g_consumer *cp)
{
struct g_geom *gp;
struct g_vfs_softc *sc;
struct vnode *vp;
g_topology_assert();
gp = cp->geom;
sc = gp->softc;
vp = cp->private;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
bufobj_invalbuf(sc->sc_bo, V_SAVE, 0, 0);
VOP_UNLOCK(vp);
sc->sc_bo->bo_private = cp->private;
gp->softc = NULL;
mtx_destroy(&sc->sc_mtx);