diff options
Diffstat (limited to 'sys/fs/nullfs/null_vnops.c')
| -rw-r--r-- | sys/fs/nullfs/null_vnops.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/sys/fs/nullfs/null_vnops.c b/sys/fs/nullfs/null_vnops.c index af49e3e..b86ba83 100644 --- a/sys/fs/nullfs/null_vnops.c +++ b/sys/fs/nullfs/null_vnops.c @@ -499,6 +499,32 @@ null_accessx(struct vop_accessx_args *ap) } /* + * Increasing refcount of lower vnode is needed at least for the case + * when lower FS is NFS to do sillyrename if the file is in use. + * Unfortunately v_usecount is incremented in many places in + * the kernel and, as such, there may be races that result in + * the NFS client doing an extraneous silly rename, but that seems + * preferable to not doing a silly rename when it is needed. + */ +static int +null_remove(struct vop_remove_args *ap) +{ + int retval, vreleit; + struct vnode *lvp; + + if (vrefcnt(ap->a_vp) > 1) { + lvp = NULLVPTOLOWERVP(ap->a_vp); + VREF(lvp); + vreleit = 1; + } else + vreleit = 0; + retval = null_bypass(&ap->a_gen); + if (vreleit != 0) + vrele(lvp); + return (retval); +} + +/* * We handle this to eliminate null FS to lower FS * file moving. Don't know why we don't allow this, * possibly we should. @@ -809,6 +835,7 @@ struct vop_vector null_vnodeops = { .vop_open = null_open, .vop_print = null_print, .vop_reclaim = null_reclaim, + .vop_remove = null_remove, .vop_rename = null_rename, .vop_setattr = null_setattr, .vop_strategy = VOP_EOPNOTSUPP, |
