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Add vinsheadfree, a small function to push vnodes that have just 

been allocated by getnewvnode, back onto the head of the free list.
Needed in some VFS_VGET functions to deal with races.
This commit is contained in:
fvdl 2000-06-27 23:34:45 +00:00
parent 0c19f5a36f
commit c39797c045
1 changed files with 31 additions and 1 deletions
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32
sys/kern/vfs_subr.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vfs_subr.c,v 1.129 2000/06/27 17:41:49 mrg Exp $ */
/* $NetBSD: vfs_subr.c,v 1.130 2000/06/27 23:34:45 fvdl Exp $ */
/*-
* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
@ -539,6 +539,36 @@ getnewvnode(tag, mp, vops, vpp)
return (0);
}
/*
* This is really just the reverse of getnewvnode(). Needed for
* VFS_VGET functions who may need to push back a vnode in case
* of a locking race.
*/
void
vinsheadfree(vp)
struct vnode *vp;
{
#ifdef DIAGNOSTIC
if (vp->v_usecount != 1)
panic("vinsheadfree: busy vnode");
#endif
vp->v_usecount--;
insmntque(vp, NULL);
vp->v_type = VBAD;
simple_lock(&vp->v_interlock);
/*
* Insert at head of LRU list
*/
simple_lock(&vnode_free_list_slock);
if (vp->v_holdcnt > 0)
TAILQ_INSERT_HEAD(&vnode_hold_list, vp, v_freelist);
else
TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
simple_unlock(&vnode_free_list_slock);
simple_unlock(&vp->v_interlock);
}
/*
* Move a vnode from one mount queue to another.
*/