diff options
Diffstat (limited to 'sys/fs/nullfs/null_vnops.c')
| -rw-r--r-- | sys/fs/nullfs/null_vnops.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/sys/fs/nullfs/null_vnops.c b/sys/fs/nullfs/null_vnops.c index 94bfea8..f530ed2 100644 --- a/sys/fs/nullfs/null_vnops.c +++ b/sys/fs/nullfs/null_vnops.c @@ -329,6 +329,26 @@ null_bypass(struct vop_generic_args *ap) return (error); } +static int +null_add_writecount(struct vop_add_writecount_args *ap) +{ + struct vnode *lvp, *vp; + int error; + + vp = ap->a_vp; + lvp = NULLVPTOLOWERVP(vp); + KASSERT(vp->v_writecount + ap->a_inc >= 0, ("wrong writecount inc")); + if (vp->v_writecount > 0 && vp->v_writecount + ap->a_inc == 0) + error = VOP_ADD_WRITECOUNT(lvp, -1); + else if (vp->v_writecount == 0 && vp->v_writecount + ap->a_inc > 0) + error = VOP_ADD_WRITECOUNT(lvp, 1); + else + error = 0; + if (error == 0) + vp->v_writecount += ap->a_inc; + return (error); +} + /* * We have to carry on the locking protocol on the null layer vnodes * as we progress through the tree. We also have to enforce read-only @@ -826,4 +846,5 @@ struct vop_vector null_vnodeops = { .vop_unlock = null_unlock, .vop_vptocnp = null_vptocnp, .vop_vptofh = null_vptofh, + .vop_add_writecount = null_add_writecount, }; |
