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mount_domount: hold an additional reference to the mountpoint across the 

call to VFS_START. The file system can be unmounted before VFS_START
returns. Partially addresses PR kern/38291.
This commit is contained in:
ad 2008-03-25 22:13:32 +00:00
parent 87e2fc09d7
commit 8910b668ba
1 changed files with 6 additions and 3 deletions
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9
sys/kern/vfs_syscalls.c
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@ -1,4 +1,4 @@
/* $NetBSD: vfs_syscalls.c,v 1.346 2008/03/21 21:55:00 ad Exp $ */
/* $NetBSD: vfs_syscalls.c,v 1.347 2008/03/25 22:13:32 ad Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
@ -70,7 +70,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.346 2008/03/21 21:55:00 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.347 2008/03/25 22:13:32 ad Exp $");
#include "opt_compat_netbsd.h"
#include "opt_compat_43.h"
@ -387,13 +387,16 @@ mount_domount(struct lwp *l, struct vnode **vpp, struct vfsops *vfsops,
checkdirs(vp);
if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0)
error = vfs_allocate_syncvnode(mp);
vfs_unbusy(mp, false);
/* Hold an additional reference to the mount across VFS_START(). */
vfs_unbusy(mp, true);
(void) VFS_STATVFS(mp, &mp->mnt_stat);
error = VFS_START(mp, 0);
if (error) {
vrele(vp);
vfs_destroy(mp);
}
/* Drop reference held for VFS_START(). */
vfs_destroy(mp);
*vpp = NULL;
return error;
}