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From: Pawel Jakub Dawidek <pjd@FreeBSD.org>
Date: Sat, 26 Sep 2009 00:07:14 +0000 (UTC)
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Cc: 
Subject: svn commit: r197513 -
	head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
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Author: pjd
Date: Sat Sep 26 00:07:14 2009
New Revision: 197513
URL: http://svn.freebsd.org/changeset/base/197513

Log:
  Use traverse() function to find and return mount point's vnode instead of
  covered vnode when snapshot is already mounted.
  
  MFC after:	3 days

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

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ctldir.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ctldir.c	Sat Sep 26 00:04:30 2009	(r197512)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ctldir.c	Sat Sep 26 00:07:14 2009	(r197513)
@@ -818,7 +818,11 @@ zfsctl_snapdir_lookup(ap)
 	if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) != NULL) {
 		*vpp = sep->se_root;
 		VN_HOLD(*vpp);
-		if ((*vpp)->v_mountedhere == NULL) {
+		err = traverse(vpp, LK_EXCLUSIVE | LK_RETRY);
+		if (err) {
+			VN_RELE(*vpp);
+			*vpp = NULL;
+		} else if (*vpp == sep->se_root) {
 			/*
 			 * The snapshot was unmounted behind our backs,
 			 * try to remount it.
@@ -832,10 +836,9 @@ zfsctl_snapdir_lookup(ap)
 			 */
 			(*vpp)->v_flag &= ~VROOT;
 		}
-		vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY);
 		mutex_exit(&sdp->sd_lock);
 		ZFS_EXIT(zfsvfs);
-		return (0);
+		return (err);
 	}
 
 	/*