Date: Wed, 27 Jun 2012 11:59:57 +0000 (UTC) From: Martin Matuska <mm@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r237643 - stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <201206271159.q5RBxv6D008986@svn.freebsd.org>
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Author: mm Date: Wed Jun 27 11:59:57 2012 New Revision: 237643 URL: http://svn.freebsd.org/changeset/base/237643 Log: MFC r236823 (pjd): 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 Modified: stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.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/dsl_dataset.c ============================================================================== --- stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c Wed Jun 27 11:36:33 2012 (r237642) +++ stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c Wed Jun 27 11:59:57 2012 (r237643) @@ -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;
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