diff options
Diffstat (limited to 'module/zfs/dmu_send.c')
| -rw-r--r-- | module/zfs/dmu_send.c | 119 |
1 files changed, 87 insertions, 32 deletions
diff --git a/module/zfs/dmu_send.c b/module/zfs/dmu_send.c index e80631b48..c5eb2fb79 100644 --- a/module/zfs/dmu_send.c +++ b/module/zfs/dmu_send.c @@ -682,6 +682,7 @@ typedef struct dmu_recv_begin_arg { const char *drba_origin; dmu_recv_cookie_t *drba_cookie; cred_t *drba_cred; + uint64_t drba_snapobj; } dmu_recv_begin_arg_t; static int @@ -692,11 +693,6 @@ recv_begin_check_existing_impl(dmu_recv_begin_arg_t *drba, dsl_dataset_t *ds, int error; dsl_pool_t *dp = ds->ds_dir->dd_pool; - /* must not have any changes since most recent snapshot */ - if (!drba->drba_cookie->drc_force && - dsl_dataset_modified_since_lastsnap(ds)) - return (SET_ERROR(ETXTBSY)); - /* temporary clone name must not exist */ error = zap_lookup(dp->dp_meta_objset, ds->ds_dir->dd_phys->dd_child_dir_zapobj, recv_clone_name, @@ -712,41 +708,47 @@ recv_begin_check_existing_impl(dmu_recv_begin_arg_t *drba, dsl_dataset_t *ds, return (error == 0 ? EEXIST : error); if (fromguid != 0) { - /* if incremental, most recent snapshot must match fromguid */ - if (ds->ds_prev == NULL) + dsl_dataset_t *snap; + uint64_t obj = ds->ds_phys->ds_prev_snap_obj; + + /* Find snapshot in this dir that matches fromguid. */ + while (obj != 0) { + error = dsl_dataset_hold_obj(dp, obj, FTAG, + &snap); + if (error != 0) + return (SET_ERROR(ENODEV)); + if (snap->ds_dir != ds->ds_dir) { + dsl_dataset_rele(snap, FTAG); + return (SET_ERROR(ENODEV)); + } + if (snap->ds_phys->ds_guid == fromguid) + break; + obj = snap->ds_phys->ds_prev_snap_obj; + dsl_dataset_rele(snap, FTAG); + } + if (obj == 0) return (SET_ERROR(ENODEV)); - /* - * most recent snapshot must match fromguid, or there are no - * changes since the fromguid one - */ - if (ds->ds_prev->ds_phys->ds_guid != fromguid) { - uint64_t birth = ds->ds_prev->ds_phys->ds_bp.blk_birth; - uint64_t obj = ds->ds_prev->ds_phys->ds_prev_snap_obj; - while (obj != 0) { - dsl_dataset_t *snap; - error = dsl_dataset_hold_obj(dp, obj, FTAG, - &snap); - if (error != 0) - return (SET_ERROR(ENODEV)); - if (snap->ds_phys->ds_creation_txg < birth) { - dsl_dataset_rele(snap, FTAG); - return (SET_ERROR(ENODEV)); - } - if (snap->ds_phys->ds_guid == fromguid) { - dsl_dataset_rele(snap, FTAG); - break; /* it's ok */ - } - obj = snap->ds_phys->ds_prev_snap_obj; + if (drba->drba_cookie->drc_force) { + drba->drba_snapobj = obj; + } else { + /* + * If we are not forcing, there must be no + * changes since fromsnap. + */ + if (dsl_dataset_modified_since_snap(ds, snap)) { dsl_dataset_rele(snap, FTAG); + return (SET_ERROR(ETXTBSY)); } - if (obj == 0) - return (SET_ERROR(ENODEV)); + drba->drba_snapobj = ds->ds_prev->ds_object; } + + dsl_dataset_rele(snap, FTAG); } else { /* if full, most recent snapshot must be $ORIGIN */ if (ds->ds_phys->ds_prev_snap_txg >= TXG_INITIAL) return (SET_ERROR(ENODEV)); + drba->drba_snapobj = ds->ds_phys->ds_prev_snap_obj; } return (0); @@ -855,8 +857,14 @@ dmu_recv_begin_sync(void *arg, dmu_tx_t *tx) error = dsl_dataset_hold(dp, tofs, FTAG, &ds); if (error == 0) { /* create temporary clone */ + dsl_dataset_t *snap = NULL; + if (drba->drba_snapobj != 0) { + VERIFY0(dsl_dataset_hold_obj(dp, + drba->drba_snapobj, FTAG, &snap)); + } dsobj = dsl_dataset_create_sync(ds->ds_dir, recv_clone_name, - ds->ds_prev, crflags, drba->drba_cred, tx); + snap, crflags, drba->drba_cred, tx); + dsl_dataset_rele(snap, FTAG); dsl_dataset_rele(ds, FTAG); } else { dsl_dir_t *dd; @@ -1577,6 +1585,32 @@ dmu_recv_end_check(void *arg, dmu_tx_t *tx) error = dsl_dataset_hold(dp, drc->drc_tofs, FTAG, &origin_head); if (error != 0) return (error); + if (drc->drc_force) { + /* + * We will destroy any snapshots in tofs (i.e. before + * origin_head) that are after the origin (which is + * the snap before drc_ds, because drc_ds can not + * have any snaps of its own). + */ + uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj; + while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) { + dsl_dataset_t *snap; + error = dsl_dataset_hold_obj(dp, obj, FTAG, + &snap); + if (error != 0) + return (error); + if (snap->ds_dir != origin_head->ds_dir) + error = SET_ERROR(EINVAL); + if (error == 0) { + error = dsl_destroy_snapshot_check_impl( + snap, B_FALSE); + } + obj = snap->ds_phys->ds_prev_snap_obj; + dsl_dataset_rele(snap, FTAG); + if (error != 0) + return (error); + } + } error = dsl_dataset_clone_swap_check_impl(drc->drc_ds, origin_head, drc->drc_force); if (error != 0) { @@ -1611,6 +1645,27 @@ dmu_recv_end_sync(void *arg, dmu_tx_t *tx) VERIFY0(dsl_dataset_hold(dp, drc->drc_tofs, FTAG, &origin_head)); + + if (drc->drc_force) { + /* + * Destroy any snapshots of drc_tofs (origin_head) + * after the origin (the snap before drc_ds). + */ + uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj; + while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) { + dsl_dataset_t *snap; + VERIFY0(dsl_dataset_hold_obj(dp, obj, FTAG, + &snap)); + ASSERT3P(snap->ds_dir, ==, origin_head->ds_dir); + obj = snap->ds_phys->ds_prev_snap_obj; + dsl_destroy_snapshot_sync_impl(snap, + B_FALSE, tx); + dsl_dataset_rele(snap, FTAG); + } + } + VERIFY3P(drc->drc_ds->ds_prev, ==, + origin_head->ds_prev); + dsl_dataset_clone_swap_sync_impl(drc->drc_ds, origin_head, tx); dsl_dataset_snapshot_sync_impl(origin_head, |