svn commit: r243767 - stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs

[Andriy Gapon]

Author: avg
Date: Sat Dec  1 19:12:43 2012
New Revision: 243767
URL: http://svnweb.freebsd.org/changeset/base/243767

Log:
  MFC r242575: zfs_dirlook: bailout early if directory is unlinked

Modified:
  stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_dir.c
Directory Properties:
  stable/9/sys/   (props changed)
  stable/9/sys/cddl/contrib/opensolaris/   (props changed)

Modified: stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_dir.c
==============================================================================
--- stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_dir.c	Sat Dec  1 19:05:47 2012	(r243766)
+++ stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_dir.c	Sat Dec  1 19:12:43 2012	(r243767)
@@ -374,8 +374,15 @@ zfs_dirlook(znode_t *dzp, char *name, vn
 	znode_t *zp;
 	int error = 0;
 	uint64_t parent;
+	int unlinked;
 
 	if (name[0] == 0 || (name[0] == '.' && name[1] == 0)) {
+		mutex_enter(&dzp->z_lock);
+		unlinked = dzp->z_unlinked;
+		mutex_exit(&dzp->z_lock);
+		if (unlinked)
+			return (ENOENT);
+
 		*vpp = ZTOV(dzp);
 		VN_HOLD(*vpp);
 	} else if (name[0] == '.' && name[1] == '.' && name[2] == 0) {
@@ -394,6 +401,13 @@ zfs_dirlook(znode_t *dzp, char *name, vn
 			    NULL, NULL, NULL);
 			return (error);
 		}
+
+		mutex_enter(&dzp->z_lock);
+		unlinked = dzp->z_unlinked;
+		mutex_exit(&dzp->z_lock);
+		if (unlinked)
+			return (ENOENT);
+
 		rw_enter(&dzp->z_parent_lock, RW_READER);
 		error = zfs_zget(zfsvfs, parent, &zp);
 		if (error == 0)