From owner-svn-src-head@FreeBSD.ORG Sat Jun 9 20:16:19 2012 Return-Path: Delivered-To: svn-src-head@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id C077B106566B; Sat, 9 Jun 2012 20:16:19 +0000 (UTC) (envelope-from pjd@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c]) by mx1.freebsd.org (Postfix) with ESMTP id AA9BD8FC08; Sat, 9 Jun 2012 20:16:19 +0000 (UTC) Received: from svn.freebsd.org (localhost [127.0.0.1]) by svn.freebsd.org (8.14.4/8.14.4) with ESMTP id q59KGJvb052044; Sat, 9 Jun 2012 20:16:19 GMT (envelope-from pjd@svn.freebsd.org) Received: (from pjd@localhost) by svn.freebsd.org (8.14.4/8.14.4/Submit) id q59KGJkR052042; Sat, 9 Jun 2012 20:16:19 GMT (envelope-from pjd@svn.freebsd.org) Message-Id: <201206092016.q59KGJkR052042@svn.freebsd.org> From: Pawel Jakub Dawidek Date: Sat, 9 Jun 2012 20:16:19 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: Subject: svn commit: r236823 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 09 Jun 2012 20:16:19 -0000 Author: pjd Date: Sat Jun 9 20:16:19 2012 New Revision: 236823 URL: http://svn.freebsd.org/changeset/base/236823 Log: ds_guid of 0 is special, as it is used by snapshot receive code to differentiate between an incremental and full stream. Be sure not to generate guid equal to 0. Reported by: someone who saw 0 being generated as 64bit random guid MFC after: 3 days Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c ============================================================================== --- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c Sat Jun 9 18:50:32 2012 (r236822) +++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c Sat Jun 9 20:16:19 2012 (r236823) @@ -809,8 +809,10 @@ dsl_dataset_create_sync_dd(dsl_dir_t *dd dsphys->ds_dir_obj = dd->dd_object; dsphys->ds_flags = flags; dsphys->ds_fsid_guid = unique_create(); - (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, - sizeof (dsphys->ds_guid)); + do { + (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, + sizeof (dsphys->ds_guid)); + } while (dsphys->ds_guid == 0); dsphys->ds_snapnames_zapobj = zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, DMU_OT_NONE, 0, tx); @@ -2082,8 +2084,10 @@ dsl_dataset_snapshot_sync(void *arg1, vo bzero(dsphys, sizeof (dsl_dataset_phys_t)); dsphys->ds_dir_obj = ds->ds_dir->dd_object; dsphys->ds_fsid_guid = unique_create(); - (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, - sizeof (dsphys->ds_guid)); + do { + (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, + sizeof (dsphys->ds_guid)); + } while (dsphys->ds_guid == 0); dsphys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj; dsphys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg; dsphys->ds_next_snap_obj = ds->ds_object;