On Tue, Apr 03, 2018 at 04:46:56PM +0200, Martin Pieuchot wrote:
> namei() currently uses fd_getfile() without calling FREF()/FRELE()
> because it doesn't sleep before grabbing a reference on the vnode.
>
> This won't be enough as soon as we start unlocking some syscalls,
> so add a FREF()/FRELE() dance.
>
> Ok?
OK bluhm@
> Index: kern/vfs_lookup.c
> ===================================================================
> RCS file: /cvs/src/sys/kern/vfs_lookup.c,v
> retrieving revision 1.65
> diff -u -p -r1.65 vfs_lookup.c
> --- kern/vfs_lookup.c 29 Aug 2017 02:51:27 -0000 1.65
> +++ kern/vfs_lookup.c 3 Apr 2018 13:33:35 -0000
> @@ -190,12 +190,15 @@ fail:
> pool_put(&namei_pool, cnp->cn_pnbuf);
> return (EBADF);
> }
> + FREF(fp);
> dp = (struct vnode *)fp->f_data;
> if (fp->f_type != DTYPE_VNODE || dp->v_type != VDIR) {
> + FRELE(fp, p);
> pool_put(&namei_pool, cnp->cn_pnbuf);
> return (ENOTDIR);
> }
> vref(dp);
> + FRELE(fp, p);
> }
> for (;;) {
> if (!dp->v_mount) {
