diff options
Diffstat (limited to 'sys/kern/vfs_subr.c')
| -rw-r--r-- | sys/kern/vfs_subr.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c index 3c612ce..901a59c 100644 --- a/sys/kern/vfs_subr.c +++ b/sys/kern/vfs_subr.c @@ -2726,7 +2726,34 @@ vgonechrl(struct vnode *vp, struct thread *td) { ASSERT_VI_LOCKED(vp, "vgonechrl"); vx_lock(vp); - vclean(vp, 0, td); + /* + * This is a custom version of vclean() which does not tearm down + * the bufs or vm objects held by this vnode. This allows filesystems + * to continue using devices which were discovered via another + * filesystem that has been unmounted. + */ + if (vp->v_usecount != 0) { + v_incr_usecount(vp, 1); + /* + * Ensure that no other activity can occur while the + * underlying object is being cleaned out. + */ + VOP_LOCK(vp, LK_DRAIN | LK_INTERLOCK, td); + /* + * Any other processes trying to obtain this lock must first + * wait for VXLOCK to clear, then call the new lock operation. + */ + VOP_UNLOCK(vp, 0, td); + vp->v_vnlock = &vp->v_lock; + vp->v_tag = "orphanchr"; + vp->v_op = spec_vnodeop_p; + if (vp->v_mount != NULL) + insmntque(vp, (struct mount *)0); + cache_purge(vp); + vrele(vp); + VI_LOCK(vp); + } else + vclean(vp, 0, td); vp->v_op = spec_vnodeop_p; vx_unlock(vp); VI_UNLOCK(vp); |
