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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