Date: Sat, 24 Dec 2016 14:17:50 +0000 (UTC) From: Andriy Gapon <avg@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r310512 - in stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs: . sys Message-ID: <201612241417.uBOEHodj058810@repo.freebsd.org>
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Author: avg Date: Sat Dec 24 14:17:50 2016 New Revision: 310512 URL: https://svnweb.freebsd.org/changeset/base/310512 Log: MFC r309098: MFV r308988: 7199, 7200 dsl_dataset_rollback_sync may try to free already free blocks Modified: stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_pool.c stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/dsl_dataset.h Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c ============================================================================== --- stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c Sat Dec 24 14:17:41 2016 (r310511) +++ stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c Sat Dec 24 14:17:50 2016 (r310512) @@ -88,6 +88,8 @@ extern inline dsl_dataset_phys_t *dsl_da extern int spa_asize_inflation; +static zil_header_t zero_zil; + /* * Figure out how much of this delta should be propogated to the dsl_dir * layer. If there's a refreservation, that space has already been @@ -132,6 +134,7 @@ dsl_dataset_block_born(dsl_dataset_t *ds return; } + ASSERT3U(bp->blk_birth, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); dmu_buf_will_dirty(ds->ds_dbuf, tx); mutex_enter(&ds->ds_lock); delta = parent_delta(ds, used); @@ -902,8 +905,20 @@ dsl_dataset_zero_zil(dsl_dataset_t *ds, objset_t *os; VERIFY0(dmu_objset_from_ds(ds, &os)); - bzero(&os->os_zil_header, sizeof (os->os_zil_header)); - dsl_dataset_dirty(ds, tx); + if (bcmp(&os->os_zil_header, &zero_zil, sizeof (zero_zil)) != 0) { + dsl_pool_t *dp = ds->ds_dir->dd_pool; + zio_t *zio; + + bzero(&os->os_zil_header, sizeof (os->os_zil_header)); + + zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); + dsl_dataset_sync(ds, zio, tx); + VERIFY0(zio_wait(zio)); + + /* dsl_dataset_sync_done will drop this reference. */ + dmu_buf_add_ref(ds->ds_dbuf, ds); + dsl_dataset_sync_done(ds, tx); + } } uint64_t @@ -1083,8 +1098,10 @@ dsl_dataset_dirty(dsl_dataset_t *ds, dmu if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) panic("dirtying snapshot!"); - dp = ds->ds_dir->dd_pool; + /* Must not dirty a dataset in the same txg where it got snapshotted. */ + ASSERT3U(tx->tx_txg, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); + dp = ds->ds_dir->dd_pool; if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { /* up the hold count until we can be written out */ dmu_buf_add_ref(ds->ds_dbuf, ds); @@ -1339,8 +1356,6 @@ void dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, dmu_tx_t *tx) { - static zil_header_t zero_zil; - dsl_pool_t *dp = ds->ds_dir->dd_pool; dmu_buf_t *dbuf; dsl_dataset_phys_t *dsphys; @@ -1359,6 +1374,10 @@ dsl_dataset_snapshot_sync_impl(dsl_datas bcmp(&os->os_phys->os_zil_header, &zero_zil, sizeof (zero_zil)) == 0); + /* Should not snapshot a dirty dataset. */ + ASSERT(!txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, + ds, tx->tx_txg)); + dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); /* @@ -1718,6 +1737,27 @@ dsl_dataset_sync(dsl_dataset_t *ds, zio_ } } +static int +deadlist_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) +{ + dsl_deadlist_t *dl = arg; + dsl_deadlist_insert(dl, bp, tx); + return (0); +} + +void +dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx) +{ + objset_t *os = ds->ds_objset; + + bplist_iterate(&ds->ds_pending_deadlist, + deadlist_enqueue_cb, &ds->ds_deadlist, tx); + + ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx))); + + dmu_buf_rele(ds->ds_dbuf, ds); +} + static void get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) { @@ -2237,6 +2277,18 @@ dsl_dataset_rollback_check(void *arg, dm return (SET_ERROR(EINVAL)); } + /* + * No rollback to a snapshot created in the current txg, because + * the rollback may dirty the dataset and create blocks that are + * not reachable from the rootbp while having a birth txg that + * falls into the snapshot's range. + */ + if (dmu_tx_is_syncing(tx) && + dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) { + dsl_dataset_rele(ds, FTAG); + return (SET_ERROR(EAGAIN)); + } + /* must not have any bookmarks after the most recent snapshot */ nvlist_t *proprequest = fnvlist_alloc(); fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); Modified: stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_pool.c ============================================================================== --- stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_pool.c Sat Dec 24 14:17:41 2016 (r310511) +++ stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_pool.c Sat Dec 24 14:17:50 2016 (r310512) @@ -528,14 +528,6 @@ dsl_pool_mos_diduse_space(dsl_pool_t *dp mutex_exit(&dp->dp_lock); } -static int -deadlist_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) -{ - dsl_deadlist_t *dl = arg; - dsl_deadlist_insert(dl, bp, tx); - return (0); -} - static void dsl_pool_sync_mos(dsl_pool_t *dp, dmu_tx_t *tx) { @@ -636,11 +628,7 @@ dsl_pool_sync(dsl_pool_t *dp, uint64_t t * - release hold from dsl_dataset_dirty() */ while ((ds = list_remove_head(&synced_datasets)) != NULL) { - objset_t *os = ds->ds_objset; - bplist_iterate(&ds->ds_pending_deadlist, - deadlist_enqueue_cb, &ds->ds_deadlist, tx); - ASSERT(!dmu_objset_is_dirty(os, txg)); - dmu_buf_rele(ds->ds_dbuf, ds); + dsl_dataset_sync_done(ds, tx); } while ((dd = txg_list_remove(&dp->dp_dirty_dirs, txg)) != NULL) { dsl_dir_sync(dd, tx); Modified: stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/dsl_dataset.h ============================================================================== --- stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/dsl_dataset.h Sat Dec 24 14:17:41 2016 (r310511) +++ stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/dsl_dataset.h Sat Dec 24 14:17:50 2016 (r310512) @@ -274,6 +274,7 @@ boolean_t dsl_dataset_modified_since_sna dsl_dataset_t *snap); void dsl_dataset_sync(dsl_dataset_t *os, zio_t *zio, dmu_tx_t *tx); +void dsl_dataset_sync_done(dsl_dataset_t *os, dmu_tx_t *tx); void dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx);
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