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OpenZFS 7199 - dsl_dataset_rollback_sync may try to free already free blocks

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7200 no blocks must be born in a txg after a snaphot is created
Authored by: Andriy Gapon <andriy.gapon@clusterhq.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Brad Lewis <brad.lewis@delphix.com>
Approved by: Gordon Ross <gordon.w.ross@gmail.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Ported-by: George Melikov <mail@gmelikov.ru>

OpenZFS-issue: https://www.illumos.org/issues/7199
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/bfaed0b
Closes #5817
This commit is contained in:
Andriy Gapon 2016-11-21 15:09:54 -08:00 committed by Brian Behlendorf
parent 409b4127ee
commit 0efd97912a
3 changed files with 59 additions and 16 deletions
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1
include/sys/dsl_dataset.h
View File

@ -280,6 +280,7 @@ boolean_t dsl_dataset_modified_since_snap(dsl_dataset_t *ds,
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);

58
module/zfs/dsl_dataset.c
View File

@ -84,6 +84,8 @@ extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds);
extern int spa_asize_inflation;
static zil_header_t zero_zil;
/*
* Figure out how much of this delta should be propagated to the dsl_dir
* layer. If there's a refreservation, that space has already been
@ -131,6 +133,7 @@ dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx)
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);
@ -931,8 +934,20 @@ dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx)
objset_t *os;
VERIFY0(dmu_objset_from_ds(ds, &os));
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));
dsl_dataset_dirty(ds, tx);
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
@ -1072,8 +1087,10 @@ dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx)
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);
@ -1354,6 +1371,10 @@ dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
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);
/*
@ -1703,6 +1724,27 @@ dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx)
}
}
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)
{
ASSERTV(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)
{
@ -2219,6 +2261,18 @@ dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx)
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 */
proprequest = fnvlist_alloc();
fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG));

14
module/zfs/dsl_pool.c
View File

@ -434,14 +434,6 @@ 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)
{
@ -552,11 +544,7 @@ dsl_pool_sync(dsl_pool_t *dp, uint64_t txg)
* - release hold from dsl_dataset_dirty()
*/
while ((ds = list_remove_head(&synced_datasets)) != NULL) {
ASSERTV(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) {