static int
zcp_clones_iter(lua_State *state)
{
int err;
char clonename[ZFS_MAX_DATASET_NAME_LEN];
uint64_t dsobj = lua_tonumber(state, lua_upvalueindex(1));
uint64_t cursor = lua_tonumber(state, lua_upvalueindex(2));
dsl_pool_t *dp = zcp_run_info(state)->zri_pool;
dsl_dataset_t *ds, *clone;
zap_attribute_t za;
zap_cursor_t zc;
err = dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds);
if (err == ENOENT) {
return (0);
} else if (err != 0) {
return (luaL_error(state,
"unexpected error %d from dsl_dataset_hold_obj(dsobj)",
err));
}
if (dsl_dataset_phys(ds)->ds_next_clones_obj == 0) {
dsl_dataset_rele(ds, FTAG);
return (0);
}
zap_cursor_init_serialized(&zc, dp->dp_meta_objset,
dsl_dataset_phys(ds)->ds_next_clones_obj, cursor);
dsl_dataset_rele(ds, FTAG);
err = zap_cursor_retrieve(&zc, &za);
if (err != 0) {
zap_cursor_fini(&zc);
if (err != ENOENT) {
return (luaL_error(state,
"unexpected error %d from zap_cursor_retrieve()",
err));
}
return (0);
}
zap_cursor_advance(&zc);
cursor = zap_cursor_serialize(&zc);
zap_cursor_fini(&zc);
err = dsl_dataset_hold_obj(dp, za.za_first_integer, FTAG, &clone);
if (err != 0) {
return (luaL_error(state,
"unexpected error %d from "
"dsl_dataset_hold_obj(za_first_integer)", err));
}
dsl_dir_name(clone->ds_dir, clonename);
dsl_dataset_rele(clone, FTAG);
lua_pushnumber(state, cursor);
lua_replace(state, lua_upvalueindex(2));
(void) lua_pushstring(state, clonename);
return (1);
}
int
dsl_dataset_get_holds(const char *dsname, nvlist_t *nvl)
{
dsl_pool_t *dp;
dsl_dataset_t *ds;
int err;
err = dsl_pool_hold(dsname, FTAG, &dp);
if (err != 0)
return (err);
err = dsl_dataset_hold(dp, dsname, FTAG, &ds);
if (err != 0) {
dsl_pool_rele(dp, FTAG);
return (err);
}
if (dsl_dataset_phys(ds)->ds_userrefs_obj != 0) {
zap_attribute_t *za;
zap_cursor_t zc;
za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
for (zap_cursor_init(&zc, ds->ds_dir->dd_pool->dp_meta_objset,
dsl_dataset_phys(ds)->ds_userrefs_obj);
zap_cursor_retrieve(&zc, za) == 0;
zap_cursor_advance(&zc)) {
fnvlist_add_uint64(nvl, za->za_name,
za->za_first_integer);
}
zap_cursor_fini(&zc);
kmem_free(za, sizeof (zap_attribute_t));
}
dsl_dataset_rele(ds, FTAG);
dsl_pool_rele(dp, FTAG);
return (0);
}
/*
* If you add new checks here, you may need to add additional checks to the
* "temporary" case in snapshot_check() in dmu_objset.c.
*/
int
dsl_dataset_user_hold_check_one(dsl_dataset_t *ds, const char *htag,
boolean_t temphold, dmu_tx_t *tx)
{
dsl_pool_t *dp = dmu_tx_pool(tx);
objset_t *mos = dp->dp_meta_objset;
int error = 0;
ASSERT(dsl_pool_config_held(dp));
if (strlen(htag) > MAXNAMELEN)
return (SET_ERROR(E2BIG));
/* Tempholds have a more restricted length */
if (temphold && strlen(htag) + MAX_TAG_PREFIX_LEN >= MAXNAMELEN)
return (SET_ERROR(E2BIG));
/* tags must be unique (if ds already exists) */
if (ds != NULL && dsl_dataset_phys(ds)->ds_userrefs_obj != 0) {
uint64_t value;
error = zap_lookup(mos, dsl_dataset_phys(ds)->ds_userrefs_obj,
htag, 8, 1, &value);
if (error == 0)
error = SET_ERROR(EEXIST);
else if (error == ENOENT)
error = 0;
}
return (error);
}
static void
dsl_bookmark_create_sync(void *arg, dmu_tx_t *tx)
{
dsl_bookmark_create_arg_t *dbca = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
objset_t *mos = dp->dp_meta_objset;
nvpair_t *pair;
ASSERT(spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARKS));
for (pair = nvlist_next_nvpair(dbca->dbca_bmarks, NULL);
pair != NULL; pair = nvlist_next_nvpair(dbca->dbca_bmarks, pair)) {
dsl_dataset_t *snapds, *bmark_fs;
zfs_bookmark_phys_t bmark_phys;
char *shortname;
VERIFY0(dsl_dataset_hold(dp, fnvpair_value_string(pair),
FTAG, &snapds));
VERIFY0(dsl_bookmark_hold_ds(dp, nvpair_name(pair),
&bmark_fs, FTAG, &shortname));
if (bmark_fs->ds_bookmarks == 0) {
bmark_fs->ds_bookmarks =
zap_create_norm(mos, U8_TEXTPREP_TOUPPER,
DMU_OTN_ZAP_METADATA, DMU_OT_NONE, 0, tx);
spa_feature_incr(dp->dp_spa, SPA_FEATURE_BOOKMARKS, tx);
dsl_dataset_zapify(bmark_fs, tx);
VERIFY0(zap_add(mos, bmark_fs->ds_object,
DS_FIELD_BOOKMARK_NAMES,
sizeof (bmark_fs->ds_bookmarks), 1,
&bmark_fs->ds_bookmarks, tx));
}
bmark_phys.zbm_guid = dsl_dataset_phys(snapds)->ds_guid;
bmark_phys.zbm_creation_txg =
dsl_dataset_phys(snapds)->ds_creation_txg;
bmark_phys.zbm_creation_time =
dsl_dataset_phys(snapds)->ds_creation_time;
VERIFY0(zap_add(mos, bmark_fs->ds_bookmarks,
shortname, sizeof (uint64_t),
sizeof (zfs_bookmark_phys_t) / sizeof (uint64_t),
&bmark_phys, tx));
spa_history_log_internal_ds(bmark_fs, "bookmark", tx,
"name=%s creation_txg=%llu target_snap=%llu",
shortname,
(longlong_t)bmark_phys.zbm_creation_txg,
(longlong_t)snapds->ds_object);
dsl_dataset_rele(bmark_fs, FTAG);
dsl_dataset_rele(snapds, FTAG);
}
}
static void
dsl_dataset_user_hold_sync_one_impl(nvlist_t *tmpholds, dsl_dataset_t *ds,
const char *htag, minor_t minor, uint64_t now, dmu_tx_t *tx)
{
dsl_pool_t *dp = ds->ds_dir->dd_pool;
objset_t *mos = dp->dp_meta_objset;
uint64_t zapobj;
ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
if (dsl_dataset_phys(ds)->ds_userrefs_obj == 0) {
/*
* This is the first user hold for this dataset. Create
* the userrefs zap object.
*/
dmu_buf_will_dirty(ds->ds_dbuf, tx);
zapobj = dsl_dataset_phys(ds)->ds_userrefs_obj =
zap_create(mos, DMU_OT_USERREFS, DMU_OT_NONE, 0, tx);
} else {
zapobj = dsl_dataset_phys(ds)->ds_userrefs_obj;
}
ds->ds_userrefs++;
VERIFY0(zap_add(mos, zapobj, htag, 8, 1, &now, tx));
if (minor != 0) {
char name[MAXNAMELEN];
nvlist_t *tags;
VERIFY0(dsl_pool_user_hold(dp, ds->ds_object,
htag, now, tx));
(void) snprintf(name, sizeof (name), "%llx",
(u_longlong_t)ds->ds_object);
if (nvlist_lookup_nvlist(tmpholds, name, &tags) != 0) {
tags = fnvlist_alloc();
fnvlist_add_boolean(tags, htag);
fnvlist_add_nvlist(tmpholds, name, tags);
fnvlist_free(tags);
} else {
fnvlist_add_boolean(tags, htag);
}
}
spa_history_log_internal_ds(ds, "hold", tx,
"tag=%s temp=%d refs=%llu",
htag, minor != 0, ds->ds_userrefs);
}
static void
dsl_dataset_user_release_sync_one(dsl_dataset_t *ds, nvlist_t *holds,
dmu_tx_t *tx)
{
dsl_pool_t *dp = ds->ds_dir->dd_pool;
objset_t *mos = dp->dp_meta_objset;
nvpair_t *pair;
for (pair = nvlist_next_nvpair(holds, NULL); pair != NULL;
pair = nvlist_next_nvpair(holds, pair)) {
int error;
const char *holdname = nvpair_name(pair);
/* Remove temporary hold if one exists. */
error = dsl_pool_user_release(dp, ds->ds_object, holdname, tx);
VERIFY(error == 0 || error == ENOENT);
VERIFY0(zap_remove(mos, dsl_dataset_phys(ds)->ds_userrefs_obj,
holdname, tx));
ds->ds_userrefs--;
spa_history_log_internal_ds(ds, "release", tx,
"tag=%s refs=%lld", holdname, (longlong_t)ds->ds_userrefs);
}
}
static void
dsl_destroy_snapshot_handle_remaps(dsl_dataset_t *ds, dsl_dataset_t *ds_next,
dmu_tx_t *tx)
{
dsl_pool_t *dp = ds->ds_dir->dd_pool;
/* Move blocks to be obsoleted to pool's obsolete list. */
if (dsl_dataset_remap_deadlist_exists(ds_next)) {
if (!bpobj_is_open(&dp->dp_obsolete_bpobj))
dsl_pool_create_obsolete_bpobj(dp, tx);
dsl_deadlist_move_bpobj(&ds_next->ds_remap_deadlist,
&dp->dp_obsolete_bpobj,
dsl_dataset_phys(ds)->ds_prev_snap_txg, tx);
}
/* Merge our deadlist into next's and free it. */
if (dsl_dataset_remap_deadlist_exists(ds)) {
uint64_t remap_deadlist_object =
dsl_dataset_get_remap_deadlist_object(ds);
ASSERT(remap_deadlist_object != 0);
mutex_enter(&ds_next->ds_remap_deadlist_lock);
if (!dsl_dataset_remap_deadlist_exists(ds_next))
dsl_dataset_create_remap_deadlist(ds_next, tx);
mutex_exit(&ds_next->ds_remap_deadlist_lock);
dsl_deadlist_merge(&ds_next->ds_remap_deadlist,
remap_deadlist_object, tx);
dsl_dataset_destroy_remap_deadlist(ds, tx);
}
}
int
dsl_destroy_snapshot_check_impl(dsl_dataset_t *ds, boolean_t defer)
{
if (!ds->ds_is_snapshot)
return (SET_ERROR(EINVAL));
if (dsl_dataset_long_held(ds))
return (SET_ERROR(EBUSY));
/*
* Only allow deferred destroy on pools that support it.
* NOTE: deferred destroy is only supported on snapshots.
*/
if (defer) {
if (spa_version(ds->ds_dir->dd_pool->dp_spa) <
SPA_VERSION_USERREFS)
return (SET_ERROR(ENOTSUP));
return (0);
}
/*
* If this snapshot has an elevated user reference count,
* we can't destroy it yet.
*/
if (ds->ds_userrefs > 0)
return (SET_ERROR(EBUSY));
/*
* Can't delete a branch point.
*/
if (dsl_dataset_phys(ds)->ds_num_children > 1)
return (SET_ERROR(EEXIST));
return (0);
}
static void
dsl_dataset_user_release_sync(void *arg, dmu_tx_t *tx)
{
dsl_dataset_user_release_arg_t *ddura = arg;
dsl_holdfunc_t *holdfunc = ddura->ddura_holdfunc;
dsl_pool_t *dp = dmu_tx_pool(tx);
ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
for (nvpair_t *pair = nvlist_next_nvpair(ddura->ddura_chkholds, NULL);
pair != NULL; pair = nvlist_next_nvpair(ddura->ddura_chkholds,
pair)) {
dsl_dataset_t *ds;
const char *name = nvpair_name(pair);
VERIFY0(holdfunc(dp, name, FTAG, &ds));
dsl_dataset_user_release_sync_one(ds,
fnvpair_value_nvlist(pair), tx);
if (nvlist_exists(ddura->ddura_todelete, name)) {
ASSERT(ds->ds_userrefs == 0 &&
dsl_dataset_phys(ds)->ds_num_children == 1 &&
DS_IS_DEFER_DESTROY(ds));
dsl_destroy_snapshot_sync_impl(ds, B_FALSE, tx);
}
dsl_dataset_rele(ds, FTAG);
}
}
/*
* Returns ESRCH if bookmark is not found.
*/
static int
dsl_dataset_bmark_lookup(dsl_dataset_t *ds, const char *shortname,
zfs_bookmark_phys_t *bmark_phys)
{
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
uint64_t bmark_zapobj = ds->ds_bookmarks;
matchtype_t mt = 0;
int err;
if (bmark_zapobj == 0)
return (SET_ERROR(ESRCH));
if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
mt = MT_NORMALIZE;
/*
* Zero out the bookmark in case the one stored on disk
* is in an older, shorter format.
*/
bzero(bmark_phys, sizeof (*bmark_phys));
err = zap_lookup_norm(mos, bmark_zapobj, shortname, sizeof (uint64_t),
sizeof (*bmark_phys) / sizeof (uint64_t), bmark_phys, mt,
NULL, 0, NULL);
return (err == ENOENT ? ESRCH : err);
}
int
dsl_prop_get_ds(dsl_dataset_t *ds, const char *propname,
int intsz, int numints, void *buf, char *setpoint)
{
zfs_prop_t prop = zfs_name_to_prop(propname);
boolean_t inheritable;
uint64_t zapobj;
ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
inheritable = (prop == ZPROP_INVAL || zfs_prop_inheritable(prop));
zapobj = dsl_dataset_phys(ds)->ds_props_obj;
if (zapobj != 0) {
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
int err;
ASSERT(ds->ds_is_snapshot);
/* Check for a local value. */
err = zap_lookup(mos, zapobj, propname, intsz, numints, buf);
if (err != ENOENT) {
if (setpoint != NULL && err == 0)
dsl_dataset_name(ds, setpoint);
return (err);
}
/*
* Skip the check for a received value if there is an explicit
* inheritance entry.
*/
if (inheritable) {
char *inheritstr = kmem_asprintf("%s%s", propname,
ZPROP_INHERIT_SUFFIX);
err = zap_contains(mos, zapobj, inheritstr);
strfree(inheritstr);
if (err != 0 && err != ENOENT)
return (err);
}
if (err == ENOENT) {
/* Check for a received value. */
char *recvdstr = kmem_asprintf("%s%s", propname,
ZPROP_RECVD_SUFFIX);
err = zap_lookup(mos, zapobj, recvdstr,
intsz, numints, buf);
strfree(recvdstr);
if (err != ENOENT) {
if (setpoint != NULL && err == 0)
(void) strcpy(setpoint,
ZPROP_SOURCE_VAL_RECVD);
return (err);
}
}
}
return (dsl_prop_get_dd(ds->ds_dir, propname,
intsz, numints, buf, setpoint, ds->ds_is_snapshot));
}
static int
dsl_dataset_bookmark_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx)
{
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
uint64_t bmark_zapobj = ds->ds_bookmarks;
matchtype_t mt;
if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
mt = MT_FIRST;
else
mt = MT_EXACT;
return (zap_remove_norm(mos, bmark_zapobj, name, mt, tx));
}
static int
process_old_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
{
struct process_old_arg *poa = arg;
dsl_pool_t *dp = poa->ds->ds_dir->dd_pool;
ASSERT(!BP_IS_HOLE(bp));
if (bp->blk_birth <= dsl_dataset_phys(poa->ds)->ds_prev_snap_txg) {
dsl_deadlist_insert(&poa->ds->ds_deadlist, bp, tx);
if (poa->ds_prev && !poa->after_branch_point &&
bp->blk_birth >
dsl_dataset_phys(poa->ds_prev)->ds_prev_snap_txg) {
dsl_dataset_phys(poa->ds_prev)->ds_unique_bytes +=
bp_get_dsize_sync(dp->dp_spa, bp);
}
} else {
poa->used += bp_get_dsize_sync(dp->dp_spa, bp);
poa->comp += BP_GET_PSIZE(bp);
poa->uncomp += BP_GET_UCSIZE(bp);
dsl_free_sync(poa->pio, dp, tx->tx_txg, bp);
}
return (0);
}
static void
dsl_keychain_clone_phys(dsl_dataset_t *src, dsl_dir_t *dd,
dmu_tx_t *tx, zcrypt_key_t *dwkey)
{
objset_t *mos = dd->dd_pool->dp_meta_objset;
uint64_t keychain = dsl_dir_phys(dd)->dd_keychain_obj;
caddr_t wrappedkey = NULL;
size_t wkeylen = 0;
zcrypt_keystore_node_t *kn;
zcrypt_keychain_node_t *n;
uint64_t newest_txg = dsl_dataset_phys(src)->ds_creation_txg;
kn = zcrypt_keystore_find_node(dsl_dataset_get_spa(src),
src->ds_object, B_FALSE);
if (kn == NULL) {
kn = zcrypt_keystore_find_node(dsl_dataset_get_spa(src),
dsl_dir_phys(src->ds_dir)->dd_head_dataset_obj, B_FALSE);
}
ASSERT(kn != NULL);
ASSERT(dwkey != NULL);
/*
* Walk the in memory AVL tree representation of the keychain
* creating new keychain entries using our wrappingkey, stopping
* when we reach keychain entries created after the snapshot we
* are cloning from.
*/
mutex_enter(&kn->skn_lock);
for (n = avl_first(&kn->skn_keychain);
n != NULL && n->dkn_txg <= newest_txg;
n = AVL_NEXT(&kn->skn_keychain, n)) {
VERIFY(zcrypt_wrap_key(dwkey, n->dkn_key, &wrappedkey,
&wkeylen, zio_crypt_select_wrap(dwkey->zk_crypt)) == 0);
VERIFY(zap_update_uint64(mos, keychain, &n->dkn_txg,
1, 1, wkeylen, wrappedkey, tx) == 0);
kmem_free(wrappedkey, wkeylen);
}
mutex_exit(&kn->skn_lock);
}
/*
* Returns ESRCH if bookmark is not found.
*/
static int
dsl_dataset_bmark_lookup(dsl_dataset_t *ds, const char *shortname,
zfs_bookmark_phys_t *bmark_phys)
{
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
uint64_t bmark_zapobj = ds->ds_bookmarks;
matchtype_t mt;
int err;
if (bmark_zapobj == 0)
return (SET_ERROR(ESRCH));
if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
mt = MT_FIRST;
else
mt = MT_EXACT;
err = zap_lookup_norm(mos, bmark_zapobj, shortname, sizeof (uint64_t),
sizeof (*bmark_phys) / sizeof (uint64_t), bmark_phys, mt,
NULL, 0, NULL);
return (err == ENOENT ? ESRCH : err);
}
static void
process_old_deadlist(dsl_dataset_t *ds, dsl_dataset_t *ds_prev,
dsl_dataset_t *ds_next, boolean_t after_branch_point, dmu_tx_t *tx)
{
struct process_old_arg poa = { 0 };
dsl_pool_t *dp = ds->ds_dir->dd_pool;
objset_t *mos = dp->dp_meta_objset;
uint64_t deadlist_obj;
ASSERT(ds->ds_deadlist.dl_oldfmt);
ASSERT(ds_next->ds_deadlist.dl_oldfmt);
poa.ds = ds;
poa.ds_prev = ds_prev;
poa.after_branch_point = after_branch_point;
poa.pio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
VERIFY0(bpobj_iterate(&ds_next->ds_deadlist.dl_bpobj,
process_old_cb, &poa, tx));
VERIFY0(zio_wait(poa.pio));
ASSERT3U(poa.used, ==, dsl_dataset_phys(ds)->ds_unique_bytes);
/* change snapused */
dsl_dir_diduse_space(ds->ds_dir, DD_USED_SNAP,
-poa.used, -poa.comp, -poa.uncomp, tx);
/* swap next's deadlist to our deadlist */
dsl_deadlist_close(&ds->ds_deadlist);
dsl_deadlist_close(&ds_next->ds_deadlist);
deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj;
dsl_dataset_phys(ds)->ds_deadlist_obj =
dsl_dataset_phys(ds_next)->ds_deadlist_obj;
dsl_dataset_phys(ds_next)->ds_deadlist_obj = deadlist_obj;
dsl_deadlist_open(&ds->ds_deadlist, mos,
dsl_dataset_phys(ds)->ds_deadlist_obj);
dsl_deadlist_open(&ds_next->ds_deadlist, mos,
dsl_dataset_phys(ds_next)->ds_deadlist_obj);
}
void
dsl_destroy_snapshot_sync_impl(dsl_dataset_t *ds, boolean_t defer, dmu_tx_t *tx)
{
#ifdef ZFS_DEBUG
int err;
#endif
spa_feature_t f;
int after_branch_point = FALSE;
dsl_pool_t *dp = ds->ds_dir->dd_pool;
objset_t *mos = dp->dp_meta_objset;
dsl_dataset_t *ds_prev = NULL;
uint64_t obj, old_unique, used = 0, comp = 0, uncomp = 0;
dsl_dataset_t *ds_next, *ds_head, *hds;
ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
ASSERT3U(dsl_dataset_phys(ds)->ds_bp.blk_birth, <=, tx->tx_txg);
ASSERT(refcount_is_zero(&ds->ds_longholds));
if (defer &&
(ds->ds_userrefs > 0 ||
dsl_dataset_phys(ds)->ds_num_children > 1)) {
ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS);
dmu_buf_will_dirty(ds->ds_dbuf, tx);
dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_DEFER_DESTROY;
spa_history_log_internal_ds(ds, "defer_destroy", tx, "");
return;
}
ASSERT3U(dsl_dataset_phys(ds)->ds_num_children, <=, 1);
/* We need to log before removing it from the namespace. */
spa_history_log_internal_ds(ds, "destroy", tx, "");
dsl_scan_ds_destroyed(ds, tx);
obj = ds->ds_object;
for (f = 0; f < SPA_FEATURES; f++) {
if (ds->ds_feature_inuse[f]) {
dsl_dataset_deactivate_feature(obj, f, tx);
ds->ds_feature_inuse[f] = B_FALSE;
}
}
if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
ASSERT3P(ds->ds_prev, ==, NULL);
VERIFY0(dsl_dataset_hold_obj(dp,
dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &ds_prev));
after_branch_point =
(dsl_dataset_phys(ds_prev)->ds_next_snap_obj != obj);
dmu_buf_will_dirty(ds_prev->ds_dbuf, tx);
if (after_branch_point &&
dsl_dataset_phys(ds_prev)->ds_next_clones_obj != 0) {
dsl_dataset_remove_from_next_clones(ds_prev, obj, tx);
if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) {
VERIFY0(zap_add_int(mos,
dsl_dataset_phys(ds_prev)->
ds_next_clones_obj,
dsl_dataset_phys(ds)->ds_next_snap_obj,
tx));
}
}
if (!after_branch_point) {
dsl_dataset_phys(ds_prev)->ds_next_snap_obj =
dsl_dataset_phys(ds)->ds_next_snap_obj;
}
}
if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) {
VERIFY0(zap_add_int(mos,
dsl_dataset_phys(ds_prev)->
ds_next_clones_obj,
dsl_dataset_phys(ds)->ds_next_snap_obj,
tx));
}
}
if (!after_branch_point) {
dsl_dataset_phys(ds_prev)->ds_next_snap_obj =
dsl_dataset_phys(ds)->ds_next_snap_obj;
}
}
VERIFY0(dsl_dataset_hold_obj(dp,
dsl_dataset_phys(ds)->ds_next_snap_obj, FTAG, &ds_next));
ASSERT3U(dsl_dataset_phys(ds_next)->ds_prev_snap_obj, ==, obj);
old_unique = dsl_dataset_phys(ds_next)->ds_unique_bytes;
dmu_buf_will_dirty(ds_next->ds_dbuf, tx);
dsl_dataset_phys(ds_next)->ds_prev_snap_obj =
dsl_dataset_phys(ds)->ds_prev_snap_obj;
dsl_dataset_phys(ds_next)->ds_prev_snap_txg =
dsl_dataset_phys(ds)->ds_prev_snap_txg;
ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==,
ds_prev ? dsl_dataset_phys(ds_prev)->ds_creation_txg : 0);
if (ds_next->ds_deadlist.dl_oldfmt) {
process_old_deadlist(ds, ds_prev, ds_next,
after_branch_point, tx);
void
dsl_destroy_snapshot_sync_impl(dsl_dataset_t *ds, boolean_t defer, dmu_tx_t *tx)
{
int err;
int after_branch_point = FALSE;
dsl_pool_t *dp = ds->ds_dir->dd_pool;
objset_t *mos = dp->dp_meta_objset;
dsl_dataset_t *ds_prev = NULL;
uint64_t obj;
ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
ASSERT3U(dsl_dataset_phys(ds)->ds_bp.blk_birth, <=, tx->tx_txg);
ASSERT(refcount_is_zero(&ds->ds_longholds));
if (defer &&
(ds->ds_userrefs > 0 ||
dsl_dataset_phys(ds)->ds_num_children > 1)) {
ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS);
dmu_buf_will_dirty(ds->ds_dbuf, tx);
dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_DEFER_DESTROY;
spa_history_log_internal_ds(ds, "defer_destroy", tx, "");
return;
}
ASSERT3U(dsl_dataset_phys(ds)->ds_num_children, <=, 1);
/* We need to log before removing it from the namespace. */
spa_history_log_internal_ds(ds, "destroy", tx, "");
dsl_scan_ds_destroyed(ds, tx);
obj = ds->ds_object;
if (ds->ds_large_blocks) {
ASSERT0(zap_contains(mos, obj, DS_FIELD_LARGE_BLOCKS));
spa_feature_decr(dp->dp_spa, SPA_FEATURE_LARGE_BLOCKS, tx);
}
if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
ASSERT3P(ds->ds_prev, ==, NULL);
VERIFY0(dsl_dataset_hold_obj(dp,
dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &ds_prev));
after_branch_point =
(dsl_dataset_phys(ds_prev)->ds_next_snap_obj != obj);
dmu_buf_will_dirty(ds_prev->ds_dbuf, tx);
if (after_branch_point &&
dsl_dataset_phys(ds_prev)->ds_next_clones_obj != 0) {
dsl_dataset_remove_from_next_clones(ds_prev, obj, tx);
if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) {
VERIFY0(zap_add_int(mos,
dsl_dataset_phys(ds_prev)->
ds_next_clones_obj,
dsl_dataset_phys(ds)->ds_next_snap_obj,
tx));
}
}
if (!after_branch_point) {
dsl_dataset_phys(ds_prev)->ds_next_snap_obj =
dsl_dataset_phys(ds)->ds_next_snap_obj;
}
}
int
dsl_pool_open(dsl_pool_t *dp)
{
int err;
dsl_dir_t *dd;
dsl_dataset_t *ds;
uint64_t obj;
rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG);
err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1,
&dp->dp_root_dir_obj);
if (err)
goto out;
err = dsl_dir_hold_obj(dp, dp->dp_root_dir_obj,
NULL, dp, &dp->dp_root_dir);
if (err)
goto out;
err = dsl_pool_open_special_dir(dp, MOS_DIR_NAME, &dp->dp_mos_dir);
if (err)
goto out;
if (spa_version(dp->dp_spa) >= SPA_VERSION_ORIGIN) {
err = dsl_pool_open_special_dir(dp, ORIGIN_DIR_NAME, &dd);
if (err)
goto out;
err = dsl_dataset_hold_obj(dp,
dsl_dir_phys(dd)->dd_head_dataset_obj, FTAG, &ds);
if (err == 0) {
err = dsl_dataset_hold_obj(dp,
dsl_dataset_phys(ds)->ds_prev_snap_obj, dp,
&dp->dp_origin_snap);
dsl_dataset_rele(ds, FTAG);
}
dsl_dir_rele(dd, dp);
if (err)
goto out;
}
if (spa_version(dp->dp_spa) >= SPA_VERSION_DEADLISTS) {
err = dsl_pool_open_special_dir(dp, FREE_DIR_NAME,
&dp->dp_free_dir);
if (err)
goto out;
err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj);
if (err)
goto out;
VERIFY0(bpobj_open(&dp->dp_free_bpobj,
dp->dp_meta_objset, obj));
}
if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_OBSOLETE_COUNTS)) {
err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
DMU_POOL_OBSOLETE_BPOBJ, sizeof (uint64_t), 1, &obj);
if (err == 0) {
VERIFY0(bpobj_open(&dp->dp_obsolete_bpobj,
dp->dp_meta_objset, obj));
} else if (err == ENOENT) {
/*
* We might not have created the remap bpobj yet.
*/
err = 0;
} else {
goto out;
}
}
/*
* Note: errors ignored, because the these special dirs, used for
* space accounting, are only created on demand.
*/
(void) dsl_pool_open_special_dir(dp, LEAK_DIR_NAME,
&dp->dp_leak_dir);
if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_ASYNC_DESTROY)) {
err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
DMU_POOL_BPTREE_OBJ, sizeof (uint64_t), 1,
&dp->dp_bptree_obj);
if (err != 0)
goto out;
}
if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_EMPTY_BPOBJ)) {
err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
DMU_POOL_EMPTY_BPOBJ, sizeof (uint64_t), 1,
&dp->dp_empty_bpobj);
if (err != 0)
goto out;
}
err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
DMU_POOL_TMP_USERREFS, sizeof (uint64_t), 1,
&dp->dp_tmp_userrefs_obj);
if (err == ENOENT)
err = 0;
if (err)
goto out;
err = dsl_scan_init(dp, dp->dp_tx.tx_open_txg);
out:
rrw_exit(&dp->dp_config_rwlock, FTAG);
return (err);
}
static int
dsl_dataset_user_release_check_one(dsl_dataset_user_release_arg_t *ddura,
dsl_dataset_t *ds, nvlist_t *holds, const char *snapname)
{
uint64_t zapobj;
nvlist_t *holds_found;
objset_t *mos;
int numholds;
if (!dsl_dataset_is_snapshot(ds))
return (SET_ERROR(EINVAL));
if (nvlist_empty(holds))
return (0);
numholds = 0;
mos = ds->ds_dir->dd_pool->dp_meta_objset;
zapobj = dsl_dataset_phys(ds)->ds_userrefs_obj;
holds_found = fnvlist_alloc();
for (nvpair_t *pair = nvlist_next_nvpair(holds, NULL); pair != NULL;
pair = nvlist_next_nvpair(holds, pair)) {
uint64_t tmp;
int error;
const char *holdname = nvpair_name(pair);
if (zapobj != 0)
error = zap_lookup(mos, zapobj, holdname, 8, 1, &tmp);
else
error = SET_ERROR(ENOENT);
/*
* Non-existent holds are put on the errlist, but don't
* cause an overall failure.
*/
if (error == ENOENT) {
if (ddura->ddura_errlist != NULL) {
char *errtag = kmem_asprintf("%s#%s",
snapname, holdname);
fnvlist_add_int32(ddura->ddura_errlist, errtag,
ENOENT);
strfree(errtag);
}
continue;
}
if (error != 0) {
fnvlist_free(holds_found);
return (error);
}
fnvlist_add_boolean(holds_found, holdname);
numholds++;
}
if (DS_IS_DEFER_DESTROY(ds) &&
dsl_dataset_phys(ds)->ds_num_children == 1 &&
ds->ds_userrefs == numholds) {
/* we need to destroy the snapshot as well */
if (dsl_dataset_long_held(ds)) {
fnvlist_free(holds_found);
return (SET_ERROR(EBUSY));
}
fnvlist_add_boolean(ddura->ddura_todelete, snapname);
}
if (numholds != 0) {
fnvlist_add_nvlist(ddura->ddura_chkholds, snapname,
holds_found);
}
fnvlist_free(holds_found);
return (0);
}
static void
dsl_bookmark_create_sync(void *arg, dmu_tx_t *tx)
{
dsl_bookmark_create_arg_t *dbca = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
objset_t *mos = dp->dp_meta_objset;
nvpair_t *pair;
ASSERT(spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARKS));
for (pair = nvlist_next_nvpair(dbca->dbca_bmarks, NULL);
pair != NULL; pair = nvlist_next_nvpair(dbca->dbca_bmarks, pair)) {
dsl_dataset_t *snapds, *bmark_fs;
zfs_bookmark_phys_t bmark_phys = { 0 };
char *shortname;
uint32_t bmark_len = BOOKMARK_PHYS_SIZE_V1;
VERIFY0(dsl_dataset_hold(dp, fnvpair_value_string(pair),
FTAG, &snapds));
VERIFY0(dsl_bookmark_hold_ds(dp, nvpair_name(pair),
&bmark_fs, FTAG, &shortname));
if (bmark_fs->ds_bookmarks == 0) {
bmark_fs->ds_bookmarks =
zap_create_norm(mos, U8_TEXTPREP_TOUPPER,
DMU_OTN_ZAP_METADATA, DMU_OT_NONE, 0, tx);
spa_feature_incr(dp->dp_spa, SPA_FEATURE_BOOKMARKS, tx);
dsl_dataset_zapify(bmark_fs, tx);
VERIFY0(zap_add(mos, bmark_fs->ds_object,
DS_FIELD_BOOKMARK_NAMES,
sizeof (bmark_fs->ds_bookmarks), 1,
&bmark_fs->ds_bookmarks, tx));
}
bmark_phys.zbm_guid = dsl_dataset_phys(snapds)->ds_guid;
bmark_phys.zbm_creation_txg =
dsl_dataset_phys(snapds)->ds_creation_txg;
bmark_phys.zbm_creation_time =
dsl_dataset_phys(snapds)->ds_creation_time;
/*
* If the dataset is encrypted create a larger bookmark to
* accommodate the IVset guid. The IVset guid was added
* after the encryption feature to prevent a problem with
* raw sends. If we encounter an encrypted dataset without
* an IVset guid we fall back to a normal bookmark.
*/
if (snapds->ds_dir->dd_crypto_obj != 0 &&
spa_feature_is_enabled(dp->dp_spa,
SPA_FEATURE_BOOKMARK_V2)) {
int err = zap_lookup(mos, snapds->ds_object,
DS_FIELD_IVSET_GUID, sizeof (uint64_t), 1,
&bmark_phys.zbm_ivset_guid);
if (err == 0) {
bmark_len = BOOKMARK_PHYS_SIZE_V2;
spa_feature_incr(dp->dp_spa,
SPA_FEATURE_BOOKMARK_V2, tx);
}
}
VERIFY0(zap_add(mos, bmark_fs->ds_bookmarks,
shortname, sizeof (uint64_t),
bmark_len / sizeof (uint64_t), &bmark_phys, tx));
spa_history_log_internal_ds(bmark_fs, "bookmark", tx,
"name=%s creation_txg=%llu target_snap=%llu",
shortname,
(longlong_t)bmark_phys.zbm_creation_txg,
(longlong_t)snapds->ds_object);
dsl_dataset_rele(bmark_fs, FTAG);
dsl_dataset_rele(snapds, FTAG);
}
}
