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Change forced unmount to revert open device vnodes to anonymous devices.

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This commit is contained in:
hannken 2017-08-21 09:00:21 +00:00
parent 7801661c06
commit 28650af9eb
3 changed files with 81 additions and 6 deletions
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13
sys/kern/vfs_mount.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vfs_mount.c,v 1.66 2017/06/04 08:05:42 hannken Exp $ */
/* $NetBSD: vfs_mount.c,v 1.67 2017/08/21 09:00:21 hannken Exp $ */
/*-
* Copyright (c) 1997-2011 The NetBSD Foundation, Inc.
@ -67,7 +67,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vfs_mount.c,v 1.66 2017/06/04 08:05:42 hannken Exp $");
__KERNEL_RCSID(0, "$NetBSD: vfs_mount.c,v 1.67 2017/08/21 09:00:21 hannken Exp $");
#include <sys/param.h>
#include <sys/kernel.h>
@ -558,9 +558,16 @@ vflush_one(vnode_t *vp, vnode_t *skipvp, int flags)
return 0;
/*
* If FORCECLOSE is set, forcibly close the vnode.
* For block or character devices, revert to an
* anonymous device. For all other files, just
* kill them.
*/
if (flags & FORCECLOSE) {
vgone(vp);
if (vp->v_usecount > 1 &&
(vp->v_type == VBLK || vp->v_type == VCHR))
vcache_make_anon(vp);
else
vgone(vp);
return 0;
}
vrele(vp);

71
sys/kern/vfs_vnode.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vfs_vnode.c,v 1.97 2017/08/21 08:56:45 hannken Exp $ */
/* $NetBSD: vfs_vnode.c,v 1.98 2017/08/21 09:00:21 hannken Exp $ */
/*-
* Copyright (c) 1997-2011 The NetBSD Foundation, Inc.
@ -156,7 +156,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vfs_vnode.c,v 1.97 2017/08/21 08:56:45 hannken Exp $");
__KERNEL_RCSID(0, "$NetBSD: vfs_vnode.c,v 1.98 2017/08/21 09:00:21 hannken Exp $");
#include <sys/param.h>
#include <sys/kernel.h>
@ -225,6 +225,7 @@ static void vnpanic(vnode_t *, const char *, ...)
/* Routines having to do with the management of the vnode table. */
extern struct mount *dead_rootmount;
extern int (**dead_vnodeop_p)(void *);
extern int (**spec_vnodeop_p)(void *);
extern struct vfsops dead_vfsops;
/* Vnode state operations and diagnostics. */
@ -1649,6 +1650,72 @@ vcache_reclaim(vnode_t *vp)
KASSERT((vp->v_iflag & VI_ONWORKLST) == 0);
}
/*
* Disassociate the underlying file system from an open device vnode
* and make it anonymous.
*
* Vnode unlocked on entry, drops a reference to the vnode.
*/
void
vcache_make_anon(vnode_t *vp)
{
vnode_impl_t *vip = VNODE_TO_VIMPL(vp);
uint32_t hash;
bool recycle;
KASSERT(vp->v_type == VBLK || vp->v_type == VCHR);
KASSERT((vp->v_mount->mnt_iflag & IMNT_HAS_TRANS) == 0 ||
fstrans_is_owner(vp->v_mount));
VSTATE_ASSERT_UNLOCKED(vp, VS_ACTIVE);
/* Remove from vnode cache. */
hash = vcache_hash(&vip->vi_key);
mutex_enter(&vcache_lock);
KASSERT(vip == vcache_hash_lookup(&vip->vi_key, hash));
SLIST_REMOVE(&vcache_hashtab[hash & vcache_hashmask],
vip, vnode_impl, vi_hash);
vip->vi_key.vk_mount = dead_rootmount;
vip->vi_key.vk_key_len = 0;
vip->vi_key.vk_key = NULL;
mutex_exit(&vcache_lock);
/*
* Disassociate the underlying file system from the vnode.
* VOP_INACTIVE leaves the vnode locked; VOP_RECLAIM unlocks
* the vnode, and may destroy the vnode so that VOP_UNLOCK
* would no longer function.
*/
if (vn_lock(vp, LK_EXCLUSIVE)) {
vnpanic(vp, "%s: cannot lock", __func__);
}
VOP_INACTIVE(vp, &recycle);
KASSERT((vp->v_vflag & VV_LOCKSWORK) == 0 ||
VOP_ISLOCKED(vp) == LK_EXCLUSIVE);
if (VOP_RECLAIM(vp)) {
vnpanic(vp, "%s: cannot reclaim", __func__);
}
/* Purge name cache. */
cache_purge(vp);
/* Done with purge, change operations vector. */
mutex_enter(vp->v_interlock);
vp->v_op = spec_vnodeop_p;
vp->v_vflag |= VV_MPSAFE;
vp->v_vflag &= ~VV_LOCKSWORK;
mutex_exit(vp->v_interlock);
/*
* Move to dead mount. Must be after changing the operations
* vector as vnode operations enter the mount before using the
* operations vector. See sys/kern/vnode_if.c.
*/
vfs_ref(dead_rootmount);
vfs_insmntque(vp, dead_rootmount);
vrele(vp);
}
/*
* Update outstanding I/O count and do wakeup if requested.
*/

3
sys/sys/vnode_impl.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: vnode_impl.h,v 1.15 2017/06/04 08:02:26 hannken Exp $ */
/* $NetBSD: vnode_impl.h,v 1.16 2017/08/21 09:00:21 hannken Exp $ */
/*-
* Copyright (c) 2016 The NetBSD Foundation, Inc.
@ -119,6 +119,7 @@ vnode_t *
vnalloc_marker(struct mount *);
void vnfree_marker(vnode_t *);
bool vnis_marker(vnode_t *);
void vcache_make_anon(vnode_t *);
int vcache_vget(vnode_t *);
int vcache_tryvget(vnode_t *);
int vfs_drainvnodes(void);