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From: Pawel Jakub Dawidek <pjd@FreeBSD.org>
Date: Sun, 30 Aug 2009 21:03:41 +0000 (UTC)
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Subject: svn commit: r196662 -
	head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
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Author: pjd
Date: Sun Aug 30 21:03:40 2009
New Revision: 196662
URL: http://svn.freebsd.org/changeset/base/196662

Log:
  Add missing mountpoint vnode locking.
  
  This fixes panic on assertion with DEBUG_VFS_LOCKS and vfs.usermount=1 when
  regular user tries to mount dataset owned by him.
  
  MFC after:	1 week

Modified:
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c	Sun Aug 30 20:45:24 2009	(r196661)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c	Sun Aug 30 21:03:40 2009	(r196662)
@@ -729,7 +729,9 @@ zfs_mount(vfs_t *vfsp)
 
 			vattr.va_mask = AT_UID;
 
+			vn_lock(mvp, LK_SHARED | LK_RETRY);
 			if (error = VOP_GETATTR(mvp, &vattr, cr)) {
+				VOP_UNLOCK(mvp, 0);
 				goto out;
 			}
 
@@ -741,12 +743,15 @@ zfs_mount(vfs_t *vfsp)
 			}
 #else
 			if (error = secpolicy_vnode_owner(mvp, cr, vattr.va_uid)) {
+				VOP_UNLOCK(mvp, 0);
 				goto out;
 			}
 
 			if (error = VOP_ACCESS(mvp, VWRITE, cr, td)) {
+				VOP_UNLOCK(mvp, 0);
 				goto out;
 			}
+			VOP_UNLOCK(mvp, 0);
 #endif
 
 			secpolicy_fs_mount_clearopts(cr, vfsp);