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-rw-r--r--uts/common/fs/zfs/dsl_dir.c1416
1 files changed, 1416 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/dsl_dir.c b/uts/common/fs/zfs/dsl_dir.c
new file mode 100644
index 000000000000..1cd49c8274e8
--- /dev/null
+++ b/uts/common/fs/zfs/dsl_dir.c
@@ -0,0 +1,1416 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ */
+
+#include <sys/dmu.h>
+#include <sys/dmu_objset.h>
+#include <sys/dmu_tx.h>
+#include <sys/dsl_dataset.h>
+#include <sys/dsl_dir.h>
+#include <sys/dsl_prop.h>
+#include <sys/dsl_synctask.h>
+#include <sys/dsl_deleg.h>
+#include <sys/spa.h>
+#include <sys/metaslab.h>
+#include <sys/zap.h>
+#include <sys/zio.h>
+#include <sys/arc.h>
+#include <sys/sunddi.h>
+#include "zfs_namecheck.h"
+
+static uint64_t dsl_dir_space_towrite(dsl_dir_t *dd);
+static void dsl_dir_set_reservation_sync(void *arg1, void *arg2, dmu_tx_t *tx);
+
+
+/* ARGSUSED */
+static void
+dsl_dir_evict(dmu_buf_t *db, void *arg)
+{
+ dsl_dir_t *dd = arg;
+ dsl_pool_t *dp = dd->dd_pool;
+ int t;
+
+ for (t = 0; t < TXG_SIZE; t++) {
+ ASSERT(!txg_list_member(&dp->dp_dirty_dirs, dd, t));
+ ASSERT(dd->dd_tempreserved[t] == 0);
+ ASSERT(dd->dd_space_towrite[t] == 0);
+ }
+
+ if (dd->dd_parent)
+ dsl_dir_close(dd->dd_parent, dd);
+
+ spa_close(dd->dd_pool->dp_spa, dd);
+
+ /*
+ * The props callback list should have been cleaned up by
+ * objset_evict().
+ */
+ list_destroy(&dd->dd_prop_cbs);
+ mutex_destroy(&dd->dd_lock);
+ kmem_free(dd, sizeof (dsl_dir_t));
+}
+
+int
+dsl_dir_open_obj(dsl_pool_t *dp, uint64_t ddobj,
+ const char *tail, void *tag, dsl_dir_t **ddp)
+{
+ dmu_buf_t *dbuf;
+ dsl_dir_t *dd;
+ int err;
+
+ ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) ||
+ dsl_pool_sync_context(dp));
+
+ err = dmu_bonus_hold(dp->dp_meta_objset, ddobj, tag, &dbuf);
+ if (err)
+ return (err);
+ dd = dmu_buf_get_user(dbuf);
+#ifdef ZFS_DEBUG
+ {
+ dmu_object_info_t doi;
+ dmu_object_info_from_db(dbuf, &doi);
+ ASSERT3U(doi.doi_type, ==, DMU_OT_DSL_DIR);
+ ASSERT3U(doi.doi_bonus_size, >=, sizeof (dsl_dir_phys_t));
+ }
+#endif
+ if (dd == NULL) {
+ dsl_dir_t *winner;
+
+ dd = kmem_zalloc(sizeof (dsl_dir_t), KM_SLEEP);
+ dd->dd_object = ddobj;
+ dd->dd_dbuf = dbuf;
+ dd->dd_pool = dp;
+ dd->dd_phys = dbuf->db_data;
+ mutex_init(&dd->dd_lock, NULL, MUTEX_DEFAULT, NULL);
+
+ list_create(&dd->dd_prop_cbs, sizeof (dsl_prop_cb_record_t),
+ offsetof(dsl_prop_cb_record_t, cbr_node));
+
+ dsl_dir_snap_cmtime_update(dd);
+
+ if (dd->dd_phys->dd_parent_obj) {
+ err = dsl_dir_open_obj(dp, dd->dd_phys->dd_parent_obj,
+ NULL, dd, &dd->dd_parent);
+ if (err)
+ goto errout;
+ if (tail) {
+#ifdef ZFS_DEBUG
+ uint64_t foundobj;
+
+ err = zap_lookup(dp->dp_meta_objset,
+ dd->dd_parent->dd_phys->dd_child_dir_zapobj,
+ tail, sizeof (foundobj), 1, &foundobj);
+ ASSERT(err || foundobj == ddobj);
+#endif
+ (void) strcpy(dd->dd_myname, tail);
+ } else {
+ err = zap_value_search(dp->dp_meta_objset,
+ dd->dd_parent->dd_phys->dd_child_dir_zapobj,
+ ddobj, 0, dd->dd_myname);
+ }
+ if (err)
+ goto errout;
+ } else {
+ (void) strcpy(dd->dd_myname, spa_name(dp->dp_spa));
+ }
+
+ if (dsl_dir_is_clone(dd)) {
+ dmu_buf_t *origin_bonus;
+ dsl_dataset_phys_t *origin_phys;
+
+ /*
+ * We can't open the origin dataset, because
+ * that would require opening this dsl_dir.
+ * Just look at its phys directly instead.
+ */
+ err = dmu_bonus_hold(dp->dp_meta_objset,
+ dd->dd_phys->dd_origin_obj, FTAG, &origin_bonus);
+ if (err)
+ goto errout;
+ origin_phys = origin_bonus->db_data;
+ dd->dd_origin_txg =
+ origin_phys->ds_creation_txg;
+ dmu_buf_rele(origin_bonus, FTAG);
+ }
+
+ winner = dmu_buf_set_user_ie(dbuf, dd, &dd->dd_phys,
+ dsl_dir_evict);
+ if (winner) {
+ if (dd->dd_parent)
+ dsl_dir_close(dd->dd_parent, dd);
+ mutex_destroy(&dd->dd_lock);
+ kmem_free(dd, sizeof (dsl_dir_t));
+ dd = winner;
+ } else {
+ spa_open_ref(dp->dp_spa, dd);
+ }
+ }
+
+ /*
+ * The dsl_dir_t has both open-to-close and instantiate-to-evict
+ * holds on the spa. We need the open-to-close holds because
+ * otherwise the spa_refcnt wouldn't change when we open a
+ * dir which the spa also has open, so we could incorrectly
+ * think it was OK to unload/export/destroy the pool. We need
+ * the instantiate-to-evict hold because the dsl_dir_t has a
+ * pointer to the dd_pool, which has a pointer to the spa_t.
+ */
+ spa_open_ref(dp->dp_spa, tag);
+ ASSERT3P(dd->dd_pool, ==, dp);
+ ASSERT3U(dd->dd_object, ==, ddobj);
+ ASSERT3P(dd->dd_dbuf, ==, dbuf);
+ *ddp = dd;
+ return (0);
+
+errout:
+ if (dd->dd_parent)
+ dsl_dir_close(dd->dd_parent, dd);
+ mutex_destroy(&dd->dd_lock);
+ kmem_free(dd, sizeof (dsl_dir_t));
+ dmu_buf_rele(dbuf, tag);
+ return (err);
+
+}
+
+void
+dsl_dir_close(dsl_dir_t *dd, void *tag)
+{
+ dprintf_dd(dd, "%s\n", "");
+ spa_close(dd->dd_pool->dp_spa, tag);
+ dmu_buf_rele(dd->dd_dbuf, tag);
+}
+
+/* buf must be long enough (MAXNAMELEN + strlen(MOS_DIR_NAME) + 1 should do) */
+void
+dsl_dir_name(dsl_dir_t *dd, char *buf)
+{
+ if (dd->dd_parent) {
+ dsl_dir_name(dd->dd_parent, buf);
+ (void) strcat(buf, "/");
+ } else {
+ buf[0] = '\0';
+ }
+ if (!MUTEX_HELD(&dd->dd_lock)) {
+ /*
+ * recursive mutex so that we can use
+ * dprintf_dd() with dd_lock held
+ */
+ mutex_enter(&dd->dd_lock);
+ (void) strcat(buf, dd->dd_myname);
+ mutex_exit(&dd->dd_lock);
+ } else {
+ (void) strcat(buf, dd->dd_myname);
+ }
+}
+
+/* Calculate name legnth, avoiding all the strcat calls of dsl_dir_name */
+int
+dsl_dir_namelen(dsl_dir_t *dd)
+{
+ int result = 0;
+
+ if (dd->dd_parent) {
+ /* parent's name + 1 for the "/" */
+ result = dsl_dir_namelen(dd->dd_parent) + 1;
+ }
+
+ if (!MUTEX_HELD(&dd->dd_lock)) {
+ /* see dsl_dir_name */
+ mutex_enter(&dd->dd_lock);
+ result += strlen(dd->dd_myname);
+ mutex_exit(&dd->dd_lock);
+ } else {
+ result += strlen(dd->dd_myname);
+ }
+
+ return (result);
+}
+
+static int
+getcomponent(const char *path, char *component, const char **nextp)
+{
+ char *p;
+ if ((path == NULL) || (path[0] == '\0'))
+ return (ENOENT);
+ /* This would be a good place to reserve some namespace... */
+ p = strpbrk(path, "/@");
+ if (p && (p[1] == '/' || p[1] == '@')) {
+ /* two separators in a row */
+ return (EINVAL);
+ }
+ if (p == NULL || p == path) {
+ /*
+ * if the first thing is an @ or /, it had better be an
+ * @ and it had better not have any more ats or slashes,
+ * and it had better have something after the @.
+ */
+ if (p != NULL &&
+ (p[0] != '@' || strpbrk(path+1, "/@") || p[1] == '\0'))
+ return (EINVAL);
+ if (strlen(path) >= MAXNAMELEN)
+ return (ENAMETOOLONG);
+ (void) strcpy(component, path);
+ p = NULL;
+ } else if (p[0] == '/') {
+ if (p-path >= MAXNAMELEN)
+ return (ENAMETOOLONG);
+ (void) strncpy(component, path, p - path);
+ component[p-path] = '\0';
+ p++;
+ } else if (p[0] == '@') {
+ /*
+ * if the next separator is an @, there better not be
+ * any more slashes.
+ */
+ if (strchr(path, '/'))
+ return (EINVAL);
+ if (p-path >= MAXNAMELEN)
+ return (ENAMETOOLONG);
+ (void) strncpy(component, path, p - path);
+ component[p-path] = '\0';
+ } else {
+ ASSERT(!"invalid p");
+ }
+ *nextp = p;
+ return (0);
+}
+
+/*
+ * same as dsl_open_dir, ignore the first component of name and use the
+ * spa instead
+ */
+int
+dsl_dir_open_spa(spa_t *spa, const char *name, void *tag,
+ dsl_dir_t **ddp, const char **tailp)
+{
+ char buf[MAXNAMELEN];
+ const char *next, *nextnext = NULL;
+ int err;
+ dsl_dir_t *dd;
+ dsl_pool_t *dp;
+ uint64_t ddobj;
+ int openedspa = FALSE;
+
+ dprintf("%s\n", name);
+
+ err = getcomponent(name, buf, &next);
+ if (err)
+ return (err);
+ if (spa == NULL) {
+ err = spa_open(buf, &spa, FTAG);
+ if (err) {
+ dprintf("spa_open(%s) failed\n", buf);
+ return (err);
+ }
+ openedspa = TRUE;
+
+ /* XXX this assertion belongs in spa_open */
+ ASSERT(!dsl_pool_sync_context(spa_get_dsl(spa)));
+ }
+
+ dp = spa_get_dsl(spa);
+
+ rw_enter(&dp->dp_config_rwlock, RW_READER);
+ err = dsl_dir_open_obj(dp, dp->dp_root_dir_obj, NULL, tag, &dd);
+ if (err) {
+ rw_exit(&dp->dp_config_rwlock);
+ if (openedspa)
+ spa_close(spa, FTAG);
+ return (err);
+ }
+
+ while (next != NULL) {
+ dsl_dir_t *child_ds;
+ err = getcomponent(next, buf, &nextnext);
+ if (err)
+ break;
+ ASSERT(next[0] != '\0');
+ if (next[0] == '@')
+ break;
+ dprintf("looking up %s in obj%lld\n",
+ buf, dd->dd_phys->dd_child_dir_zapobj);
+
+ err = zap_lookup(dp->dp_meta_objset,
+ dd->dd_phys->dd_child_dir_zapobj,
+ buf, sizeof (ddobj), 1, &ddobj);
+ if (err) {
+ if (err == ENOENT)
+ err = 0;
+ break;
+ }
+
+ err = dsl_dir_open_obj(dp, ddobj, buf, tag, &child_ds);
+ if (err)
+ break;
+ dsl_dir_close(dd, tag);
+ dd = child_ds;
+ next = nextnext;
+ }
+ rw_exit(&dp->dp_config_rwlock);
+
+ if (err) {
+ dsl_dir_close(dd, tag);
+ if (openedspa)
+ spa_close(spa, FTAG);
+ return (err);
+ }
+
+ /*
+ * It's an error if there's more than one component left, or
+ * tailp==NULL and there's any component left.
+ */
+ if (next != NULL &&
+ (tailp == NULL || (nextnext && nextnext[0] != '\0'))) {
+ /* bad path name */
+ dsl_dir_close(dd, tag);
+ dprintf("next=%p (%s) tail=%p\n", next, next?next:"", tailp);
+ err = ENOENT;
+ }
+ if (tailp)
+ *tailp = next;
+ if (openedspa)
+ spa_close(spa, FTAG);
+ *ddp = dd;
+ return (err);
+}
+
+/*
+ * Return the dsl_dir_t, and possibly the last component which couldn't
+ * be found in *tail. Return NULL if the path is bogus, or if
+ * tail==NULL and we couldn't parse the whole name. (*tail)[0] == '@'
+ * means that the last component is a snapshot.
+ */
+int
+dsl_dir_open(const char *name, void *tag, dsl_dir_t **ddp, const char **tailp)
+{
+ return (dsl_dir_open_spa(NULL, name, tag, ddp, tailp));
+}
+
+uint64_t
+dsl_dir_create_sync(dsl_pool_t *dp, dsl_dir_t *pds, const char *name,
+ dmu_tx_t *tx)
+{
+ objset_t *mos = dp->dp_meta_objset;
+ uint64_t ddobj;
+ dsl_dir_phys_t *ddphys;
+ dmu_buf_t *dbuf;
+
+ ddobj = dmu_object_alloc(mos, DMU_OT_DSL_DIR, 0,
+ DMU_OT_DSL_DIR, sizeof (dsl_dir_phys_t), tx);
+ if (pds) {
+ VERIFY(0 == zap_add(mos, pds->dd_phys->dd_child_dir_zapobj,
+ name, sizeof (uint64_t), 1, &ddobj, tx));
+ } else {
+ /* it's the root dir */
+ VERIFY(0 == zap_add(mos, DMU_POOL_DIRECTORY_OBJECT,
+ DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1, &ddobj, tx));
+ }
+ VERIFY(0 == dmu_bonus_hold(mos, ddobj, FTAG, &dbuf));
+ dmu_buf_will_dirty(dbuf, tx);
+ ddphys = dbuf->db_data;
+
+ ddphys->dd_creation_time = gethrestime_sec();
+ if (pds)
+ ddphys->dd_parent_obj = pds->dd_object;
+ ddphys->dd_props_zapobj = zap_create(mos,
+ DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx);
+ ddphys->dd_child_dir_zapobj = zap_create(mos,
+ DMU_OT_DSL_DIR_CHILD_MAP, DMU_OT_NONE, 0, tx);
+ if (spa_version(dp->dp_spa) >= SPA_VERSION_USED_BREAKDOWN)
+ ddphys->dd_flags |= DD_FLAG_USED_BREAKDOWN;
+ dmu_buf_rele(dbuf, FTAG);
+
+ return (ddobj);
+}
+
+/* ARGSUSED */
+int
+dsl_dir_destroy_check(void *arg1, void *arg2, dmu_tx_t *tx)
+{
+ dsl_dataset_t *ds = arg1;
+ dsl_dir_t *dd = ds->ds_dir;
+ dsl_pool_t *dp = dd->dd_pool;
+ objset_t *mos = dp->dp_meta_objset;
+ int err;
+ uint64_t count;
+
+ /*
+ * There should be exactly two holds, both from
+ * dsl_dataset_destroy: one on the dd directory, and one on its
+ * head ds. Otherwise, someone is trying to lookup something
+ * inside this dir while we want to destroy it. The
+ * config_rwlock ensures that nobody else opens it after we
+ * check.
+ */
+ if (dmu_buf_refcount(dd->dd_dbuf) > 2)
+ return (EBUSY);
+
+ err = zap_count(mos, dd->dd_phys->dd_child_dir_zapobj, &count);
+ if (err)
+ return (err);
+ if (count != 0)
+ return (EEXIST);
+
+ return (0);
+}
+
+void
+dsl_dir_destroy_sync(void *arg1, void *tag, dmu_tx_t *tx)
+{
+ dsl_dataset_t *ds = arg1;
+ dsl_dir_t *dd = ds->ds_dir;
+ objset_t *mos = dd->dd_pool->dp_meta_objset;
+ dsl_prop_setarg_t psa;
+ uint64_t value = 0;
+ uint64_t obj;
+ dd_used_t t;
+
+ ASSERT(RW_WRITE_HELD(&dd->dd_pool->dp_config_rwlock));
+ ASSERT(dd->dd_phys->dd_head_dataset_obj == 0);
+
+ /* Remove our reservation. */
+ dsl_prop_setarg_init_uint64(&psa, "reservation",
+ (ZPROP_SRC_NONE | ZPROP_SRC_LOCAL | ZPROP_SRC_RECEIVED),
+ &value);
+ psa.psa_effective_value = 0; /* predict default value */
+
+ dsl_dir_set_reservation_sync(ds, &psa, tx);
+
+ ASSERT3U(dd->dd_phys->dd_used_bytes, ==, 0);
+ ASSERT3U(dd->dd_phys->dd_reserved, ==, 0);
+ for (t = 0; t < DD_USED_NUM; t++)
+ ASSERT3U(dd->dd_phys->dd_used_breakdown[t], ==, 0);
+
+ VERIFY(0 == zap_destroy(mos, dd->dd_phys->dd_child_dir_zapobj, tx));
+ VERIFY(0 == zap_destroy(mos, dd->dd_phys->dd_props_zapobj, tx));
+ VERIFY(0 == dsl_deleg_destroy(mos, dd->dd_phys->dd_deleg_zapobj, tx));
+ VERIFY(0 == zap_remove(mos,
+ dd->dd_parent->dd_phys->dd_child_dir_zapobj, dd->dd_myname, tx));
+
+ obj = dd->dd_object;
+ dsl_dir_close(dd, tag);
+ VERIFY(0 == dmu_object_free(mos, obj, tx));
+}
+
+boolean_t
+dsl_dir_is_clone(dsl_dir_t *dd)
+{
+ return (dd->dd_phys->dd_origin_obj &&
+ (dd->dd_pool->dp_origin_snap == NULL ||
+ dd->dd_phys->dd_origin_obj !=
+ dd->dd_pool->dp_origin_snap->ds_object));
+}
+
+void
+dsl_dir_stats(dsl_dir_t *dd, nvlist_t *nv)
+{
+ mutex_enter(&dd->dd_lock);
+ dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
+ dd->dd_phys->dd_used_bytes);
+ dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_QUOTA, dd->dd_phys->dd_quota);
+ dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_RESERVATION,
+ dd->dd_phys->dd_reserved);
+ dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO,
+ dd->dd_phys->dd_compressed_bytes == 0 ? 100 :
+ (dd->dd_phys->dd_uncompressed_bytes * 100 /
+ dd->dd_phys->dd_compressed_bytes));
+ if (dd->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) {
+ dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDSNAP,
+ dd->dd_phys->dd_used_breakdown[DD_USED_SNAP]);
+ dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDDS,
+ dd->dd_phys->dd_used_breakdown[DD_USED_HEAD]);
+ dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDREFRESERV,
+ dd->dd_phys->dd_used_breakdown[DD_USED_REFRSRV]);
+ dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDCHILD,
+ dd->dd_phys->dd_used_breakdown[DD_USED_CHILD] +
+ dd->dd_phys->dd_used_breakdown[DD_USED_CHILD_RSRV]);
+ }
+ mutex_exit(&dd->dd_lock);
+
+ rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER);
+ if (dsl_dir_is_clone(dd)) {
+ dsl_dataset_t *ds;
+ char buf[MAXNAMELEN];
+
+ VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool,
+ dd->dd_phys->dd_origin_obj, FTAG, &ds));
+ dsl_dataset_name(ds, buf);
+ dsl_dataset_rele(ds, FTAG);
+ dsl_prop_nvlist_add_string(nv, ZFS_PROP_ORIGIN, buf);
+ }
+ rw_exit(&dd->dd_pool->dp_config_rwlock);
+}
+
+void
+dsl_dir_dirty(dsl_dir_t *dd, dmu_tx_t *tx)
+{
+ dsl_pool_t *dp = dd->dd_pool;
+
+ ASSERT(dd->dd_phys);
+
+ if (txg_list_add(&dp->dp_dirty_dirs, dd, tx->tx_txg) == 0) {
+ /* up the hold count until we can be written out */
+ dmu_buf_add_ref(dd->dd_dbuf, dd);
+ }
+}
+
+static int64_t
+parent_delta(dsl_dir_t *dd, uint64_t used, int64_t delta)
+{
+ uint64_t old_accounted = MAX(used, dd->dd_phys->dd_reserved);
+ uint64_t new_accounted = MAX(used + delta, dd->dd_phys->dd_reserved);
+ return (new_accounted - old_accounted);
+}
+
+void
+dsl_dir_sync(dsl_dir_t *dd, dmu_tx_t *tx)
+{
+ ASSERT(dmu_tx_is_syncing(tx));
+
+ dmu_buf_will_dirty(dd->dd_dbuf, tx);
+
+ mutex_enter(&dd->dd_lock);
+ ASSERT3U(dd->dd_tempreserved[tx->tx_txg&TXG_MASK], ==, 0);
+ dprintf_dd(dd, "txg=%llu towrite=%lluK\n", tx->tx_txg,
+ dd->dd_space_towrite[tx->tx_txg&TXG_MASK] / 1024);
+ dd->dd_space_towrite[tx->tx_txg&TXG_MASK] = 0;
+ mutex_exit(&dd->dd_lock);
+
+ /* release the hold from dsl_dir_dirty */
+ dmu_buf_rele(dd->dd_dbuf, dd);
+}
+
+static uint64_t
+dsl_dir_space_towrite(dsl_dir_t *dd)
+{
+ uint64_t space = 0;
+ int i;
+
+ ASSERT(MUTEX_HELD(&dd->dd_lock));
+
+ for (i = 0; i < TXG_SIZE; i++) {
+ space += dd->dd_space_towrite[i&TXG_MASK];
+ ASSERT3U(dd->dd_space_towrite[i&TXG_MASK], >=, 0);
+ }
+ return (space);
+}
+
+/*
+ * How much space would dd have available if ancestor had delta applied
+ * to it? If ondiskonly is set, we're only interested in what's
+ * on-disk, not estimated pending changes.
+ */
+uint64_t
+dsl_dir_space_available(dsl_dir_t *dd,
+ dsl_dir_t *ancestor, int64_t delta, int ondiskonly)
+{
+ uint64_t parentspace, myspace, quota, used;
+
+ /*
+ * If there are no restrictions otherwise, assume we have
+ * unlimited space available.
+ */
+ quota = UINT64_MAX;
+ parentspace = UINT64_MAX;
+
+ if (dd->dd_parent != NULL) {
+ parentspace = dsl_dir_space_available(dd->dd_parent,
+ ancestor, delta, ondiskonly);
+ }
+
+ mutex_enter(&dd->dd_lock);
+ if (dd->dd_phys->dd_quota != 0)
+ quota = dd->dd_phys->dd_quota;
+ used = dd->dd_phys->dd_used_bytes;
+ if (!ondiskonly)
+ used += dsl_dir_space_towrite(dd);
+
+ if (dd->dd_parent == NULL) {
+ uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool, FALSE);
+ quota = MIN(quota, poolsize);
+ }
+
+ if (dd->dd_phys->dd_reserved > used && parentspace != UINT64_MAX) {
+ /*
+ * We have some space reserved, in addition to what our
+ * parent gave us.
+ */
+ parentspace += dd->dd_phys->dd_reserved - used;
+ }
+
+ if (dd == ancestor) {
+ ASSERT(delta <= 0);
+ ASSERT(used >= -delta);
+ used += delta;
+ if (parentspace != UINT64_MAX)
+ parentspace -= delta;
+ }
+
+ if (used > quota) {
+ /* over quota */
+ myspace = 0;
+ } else {
+ /*
+ * the lesser of the space provided by our parent and
+ * the space left in our quota
+ */
+ myspace = MIN(parentspace, quota - used);
+ }
+
+ mutex_exit(&dd->dd_lock);
+
+ return (myspace);
+}
+
+struct tempreserve {
+ list_node_t tr_node;
+ dsl_pool_t *tr_dp;
+ dsl_dir_t *tr_ds;
+ uint64_t tr_size;
+};
+
+static int
+dsl_dir_tempreserve_impl(dsl_dir_t *dd, uint64_t asize, boolean_t netfree,
+ boolean_t ignorequota, boolean_t checkrefquota, list_t *tr_list,
+ dmu_tx_t *tx, boolean_t first)
+{
+ uint64_t txg = tx->tx_txg;
+ uint64_t est_inflight, used_on_disk, quota, parent_rsrv;
+ uint64_t deferred = 0;
+ struct tempreserve *tr;
+ int retval = EDQUOT;
+ int txgidx = txg & TXG_MASK;
+ int i;
+ uint64_t ref_rsrv = 0;
+
+ ASSERT3U(txg, !=, 0);
+ ASSERT3S(asize, >, 0);
+
+ mutex_enter(&dd->dd_lock);
+
+ /*
+ * Check against the dsl_dir's quota. We don't add in the delta
+ * when checking for over-quota because they get one free hit.
+ */
+ est_inflight = dsl_dir_space_towrite(dd);
+ for (i = 0; i < TXG_SIZE; i++)
+ est_inflight += dd->dd_tempreserved[i];
+ used_on_disk = dd->dd_phys->dd_used_bytes;
+
+ /*
+ * On the first iteration, fetch the dataset's used-on-disk and
+ * refreservation values. Also, if checkrefquota is set, test if
+ * allocating this space would exceed the dataset's refquota.
+ */
+ if (first && tx->tx_objset) {
+ int error;
+ dsl_dataset_t *ds = tx->tx_objset->os_dsl_dataset;
+
+ error = dsl_dataset_check_quota(ds, checkrefquota,
+ asize, est_inflight, &used_on_disk, &ref_rsrv);
+ if (error) {
+ mutex_exit(&dd->dd_lock);
+ return (error);
+ }
+ }
+
+ /*
+ * If this transaction will result in a net free of space,
+ * we want to let it through.
+ */
+ if (ignorequota || netfree || dd->dd_phys->dd_quota == 0)
+ quota = UINT64_MAX;
+ else
+ quota = dd->dd_phys->dd_quota;
+
+ /*
+ * Adjust the quota against the actual pool size at the root
+ * minus any outstanding deferred frees.
+ * To ensure that it's possible to remove files from a full
+ * pool without inducing transient overcommits, we throttle
+ * netfree transactions against a quota that is slightly larger,
+ * but still within the pool's allocation slop. In cases where
+ * we're very close to full, this will allow a steady trickle of
+ * removes to get through.
+ */
+ if (dd->dd_parent == NULL) {
+ spa_t *spa = dd->dd_pool->dp_spa;
+ uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool, netfree);
+ deferred = metaslab_class_get_deferred(spa_normal_class(spa));
+ if (poolsize - deferred < quota) {
+ quota = poolsize - deferred;
+ retval = ENOSPC;
+ }
+ }
+
+ /*
+ * If they are requesting more space, and our current estimate
+ * is over quota, they get to try again unless the actual
+ * on-disk is over quota and there are no pending changes (which
+ * may free up space for us).
+ */
+ if (used_on_disk + est_inflight >= quota) {
+ if (est_inflight > 0 || used_on_disk < quota ||
+ (retval == ENOSPC && used_on_disk < quota + deferred))
+ retval = ERESTART;
+ dprintf_dd(dd, "failing: used=%lluK inflight = %lluK "
+ "quota=%lluK tr=%lluK err=%d\n",
+ used_on_disk>>10, est_inflight>>10,
+ quota>>10, asize>>10, retval);
+ mutex_exit(&dd->dd_lock);
+ return (retval);
+ }
+
+ /* We need to up our estimated delta before dropping dd_lock */
+ dd->dd_tempreserved[txgidx] += asize;
+
+ parent_rsrv = parent_delta(dd, used_on_disk + est_inflight,
+ asize - ref_rsrv);
+ mutex_exit(&dd->dd_lock);
+
+ tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP);
+ tr->tr_ds = dd;
+ tr->tr_size = asize;
+ list_insert_tail(tr_list, tr);
+
+ /* see if it's OK with our parent */
+ if (dd->dd_parent && parent_rsrv) {
+ boolean_t ismos = (dd->dd_phys->dd_head_dataset_obj == 0);
+
+ return (dsl_dir_tempreserve_impl(dd->dd_parent,
+ parent_rsrv, netfree, ismos, TRUE, tr_list, tx, FALSE));
+ } else {
+ return (0);
+ }
+}
+
+/*
+ * Reserve space in this dsl_dir, to be used in this tx's txg.
+ * After the space has been dirtied (and dsl_dir_willuse_space()
+ * has been called), the reservation should be canceled, using
+ * dsl_dir_tempreserve_clear().
+ */
+int
+dsl_dir_tempreserve_space(dsl_dir_t *dd, uint64_t lsize, uint64_t asize,
+ uint64_t fsize, uint64_t usize, void **tr_cookiep, dmu_tx_t *tx)
+{
+ int err;
+ list_t *tr_list;
+
+ if (asize == 0) {
+ *tr_cookiep = NULL;
+ return (0);
+ }
+
+ tr_list = kmem_alloc(sizeof (list_t), KM_SLEEP);
+ list_create(tr_list, sizeof (struct tempreserve),
+ offsetof(struct tempreserve, tr_node));
+ ASSERT3S(asize, >, 0);
+ ASSERT3S(fsize, >=, 0);
+
+ err = arc_tempreserve_space(lsize, tx->tx_txg);
+ if (err == 0) {
+ struct tempreserve *tr;
+
+ tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP);
+ tr->tr_size = lsize;
+ list_insert_tail(tr_list, tr);
+
+ err = dsl_pool_tempreserve_space(dd->dd_pool, asize, tx);
+ } else {
+ if (err == EAGAIN) {
+ txg_delay(dd->dd_pool, tx->tx_txg, 1);
+ err = ERESTART;
+ }
+ dsl_pool_memory_pressure(dd->dd_pool);
+ }
+
+ if (err == 0) {
+ struct tempreserve *tr;
+
+ tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP);
+ tr->tr_dp = dd->dd_pool;
+ tr->tr_size = asize;
+ list_insert_tail(tr_list, tr);
+
+ err = dsl_dir_tempreserve_impl(dd, asize, fsize >= asize,
+ FALSE, asize > usize, tr_list, tx, TRUE);
+ }
+
+ if (err)
+ dsl_dir_tempreserve_clear(tr_list, tx);
+ else
+ *tr_cookiep = tr_list;
+
+ return (err);
+}
+
+/*
+ * Clear a temporary reservation that we previously made with
+ * dsl_dir_tempreserve_space().
+ */
+void
+dsl_dir_tempreserve_clear(void *tr_cookie, dmu_tx_t *tx)
+{
+ int txgidx = tx->tx_txg & TXG_MASK;
+ list_t *tr_list = tr_cookie;
+ struct tempreserve *tr;
+
+ ASSERT3U(tx->tx_txg, !=, 0);
+
+ if (tr_cookie == NULL)
+ return;
+
+ while (tr = list_head(tr_list)) {
+ if (tr->tr_dp) {
+ dsl_pool_tempreserve_clear(tr->tr_dp, tr->tr_size, tx);
+ } else if (tr->tr_ds) {
+ mutex_enter(&tr->tr_ds->dd_lock);
+ ASSERT3U(tr->tr_ds->dd_tempreserved[txgidx], >=,
+ tr->tr_size);
+ tr->tr_ds->dd_tempreserved[txgidx] -= tr->tr_size;
+ mutex_exit(&tr->tr_ds->dd_lock);
+ } else {
+ arc_tempreserve_clear(tr->tr_size);
+ }
+ list_remove(tr_list, tr);
+ kmem_free(tr, sizeof (struct tempreserve));
+ }
+
+ kmem_free(tr_list, sizeof (list_t));
+}
+
+static void
+dsl_dir_willuse_space_impl(dsl_dir_t *dd, int64_t space, dmu_tx_t *tx)
+{
+ int64_t parent_space;
+ uint64_t est_used;
+
+ mutex_enter(&dd->dd_lock);
+ if (space > 0)
+ dd->dd_space_towrite[tx->tx_txg & TXG_MASK] += space;
+
+ est_used = dsl_dir_space_towrite(dd) + dd->dd_phys->dd_used_bytes;
+ parent_space = parent_delta(dd, est_used, space);
+ mutex_exit(&dd->dd_lock);
+
+ /* Make sure that we clean up dd_space_to* */
+ dsl_dir_dirty(dd, tx);
+
+ /* XXX this is potentially expensive and unnecessary... */
+ if (parent_space && dd->dd_parent)
+ dsl_dir_willuse_space_impl(dd->dd_parent, parent_space, tx);
+}
+
+/*
+ * Call in open context when we think we're going to write/free space,
+ * eg. when dirtying data. Be conservative (ie. OK to write less than
+ * this or free more than this, but don't write more or free less).
+ */
+void
+dsl_dir_willuse_space(dsl_dir_t *dd, int64_t space, dmu_tx_t *tx)
+{
+ dsl_pool_willuse_space(dd->dd_pool, space, tx);
+ dsl_dir_willuse_space_impl(dd, space, tx);
+}
+
+/* call from syncing context when we actually write/free space for this dd */
+void
+dsl_dir_diduse_space(dsl_dir_t *dd, dd_used_t type,
+ int64_t used, int64_t compressed, int64_t uncompressed, dmu_tx_t *tx)
+{
+ int64_t accounted_delta;
+ boolean_t needlock = !MUTEX_HELD(&dd->dd_lock);
+
+ ASSERT(dmu_tx_is_syncing(tx));
+ ASSERT(type < DD_USED_NUM);
+
+ dsl_dir_dirty(dd, tx);
+
+ if (needlock)
+ mutex_enter(&dd->dd_lock);
+ accounted_delta = parent_delta(dd, dd->dd_phys->dd_used_bytes, used);
+ ASSERT(used >= 0 || dd->dd_phys->dd_used_bytes >= -used);
+ ASSERT(compressed >= 0 ||
+ dd->dd_phys->dd_compressed_bytes >= -compressed);
+ ASSERT(uncompressed >= 0 ||
+ dd->dd_phys->dd_uncompressed_bytes >= -uncompressed);
+ dd->dd_phys->dd_used_bytes += used;
+ dd->dd_phys->dd_uncompressed_bytes += uncompressed;
+ dd->dd_phys->dd_compressed_bytes += compressed;
+
+ if (dd->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) {
+ ASSERT(used > 0 ||
+ dd->dd_phys->dd_used_breakdown[type] >= -used);
+ dd->dd_phys->dd_used_breakdown[type] += used;
+#ifdef DEBUG
+ dd_used_t t;
+ uint64_t u = 0;
+ for (t = 0; t < DD_USED_NUM; t++)
+ u += dd->dd_phys->dd_used_breakdown[t];
+ ASSERT3U(u, ==, dd->dd_phys->dd_used_bytes);
+#endif
+ }
+ if (needlock)
+ mutex_exit(&dd->dd_lock);
+
+ if (dd->dd_parent != NULL) {
+ dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD,
+ accounted_delta, compressed, uncompressed, tx);
+ dsl_dir_transfer_space(dd->dd_parent,
+ used - accounted_delta,
+ DD_USED_CHILD_RSRV, DD_USED_CHILD, tx);
+ }
+}
+
+void
+dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta,
+ dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx)
+{
+ boolean_t needlock = !MUTEX_HELD(&dd->dd_lock);
+
+ ASSERT(dmu_tx_is_syncing(tx));
+ ASSERT(oldtype < DD_USED_NUM);
+ ASSERT(newtype < DD_USED_NUM);
+
+ if (delta == 0 || !(dd->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN))
+ return;
+
+ dsl_dir_dirty(dd, tx);
+ if (needlock)
+ mutex_enter(&dd->dd_lock);
+ ASSERT(delta > 0 ?
+ dd->dd_phys->dd_used_breakdown[oldtype] >= delta :
+ dd->dd_phys->dd_used_breakdown[newtype] >= -delta);
+ ASSERT(dd->dd_phys->dd_used_bytes >= ABS(delta));
+ dd->dd_phys->dd_used_breakdown[oldtype] -= delta;
+ dd->dd_phys->dd_used_breakdown[newtype] += delta;
+ if (needlock)
+ mutex_exit(&dd->dd_lock);
+}
+
+static int
+dsl_dir_set_quota_check(void *arg1, void *arg2, dmu_tx_t *tx)
+{
+ dsl_dataset_t *ds = arg1;
+ dsl_dir_t *dd = ds->ds_dir;
+ dsl_prop_setarg_t *psa = arg2;
+ int err;
+ uint64_t towrite;
+
+ if ((err = dsl_prop_predict_sync(ds->ds_dir, psa)) != 0)
+ return (err);
+
+ if (psa->psa_effective_value == 0)
+ return (0);
+
+ mutex_enter(&dd->dd_lock);
+ /*
+ * If we are doing the preliminary check in open context, and
+ * there are pending changes, then don't fail it, since the
+ * pending changes could under-estimate the amount of space to be
+ * freed up.
+ */
+ towrite = dsl_dir_space_towrite(dd);
+ if ((dmu_tx_is_syncing(tx) || towrite == 0) &&
+ (psa->psa_effective_value < dd->dd_phys->dd_reserved ||
+ psa->psa_effective_value < dd->dd_phys->dd_used_bytes + towrite)) {
+ err = ENOSPC;
+ }
+ mutex_exit(&dd->dd_lock);
+ return (err);
+}
+
+extern dsl_syncfunc_t dsl_prop_set_sync;
+
+static void
+dsl_dir_set_quota_sync(void *arg1, void *arg2, dmu_tx_t *tx)
+{
+ dsl_dataset_t *ds = arg1;
+ dsl_dir_t *dd = ds->ds_dir;
+ dsl_prop_setarg_t *psa = arg2;
+ uint64_t effective_value = psa->psa_effective_value;
+
+ dsl_prop_set_sync(ds, psa, tx);
+ DSL_PROP_CHECK_PREDICTION(dd, psa);
+
+ dmu_buf_will_dirty(dd->dd_dbuf, tx);
+
+ mutex_enter(&dd->dd_lock);
+ dd->dd_phys->dd_quota = effective_value;
+ mutex_exit(&dd->dd_lock);
+
+ spa_history_log_internal(LOG_DS_QUOTA, dd->dd_pool->dp_spa,
+ tx, "%lld dataset = %llu ",
+ (longlong_t)effective_value, dd->dd_phys->dd_head_dataset_obj);
+}
+
+int
+dsl_dir_set_quota(const char *ddname, zprop_source_t source, uint64_t quota)
+{
+ dsl_dir_t *dd;
+ dsl_dataset_t *ds;
+ dsl_prop_setarg_t psa;
+ int err;
+
+ dsl_prop_setarg_init_uint64(&psa, "quota", source, &quota);
+
+ err = dsl_dataset_hold(ddname, FTAG, &ds);
+ if (err)
+ return (err);
+
+ err = dsl_dir_open(ddname, FTAG, &dd, NULL);
+ if (err) {
+ dsl_dataset_rele(ds, FTAG);
+ return (err);
+ }
+
+ ASSERT(ds->ds_dir == dd);
+
+ /*
+ * If someone removes a file, then tries to set the quota, we want to
+ * make sure the file freeing takes effect.
+ */
+ txg_wait_open(dd->dd_pool, 0);
+
+ err = dsl_sync_task_do(dd->dd_pool, dsl_dir_set_quota_check,
+ dsl_dir_set_quota_sync, ds, &psa, 0);
+
+ dsl_dir_close(dd, FTAG);
+ dsl_dataset_rele(ds, FTAG);
+ return (err);
+}
+
+int
+dsl_dir_set_reservation_check(void *arg1, void *arg2, dmu_tx_t *tx)
+{
+ dsl_dataset_t *ds = arg1;
+ dsl_dir_t *dd = ds->ds_dir;
+ dsl_prop_setarg_t *psa = arg2;
+ uint64_t effective_value;
+ uint64_t used, avail;
+ int err;
+
+ if ((err = dsl_prop_predict_sync(ds->ds_dir, psa)) != 0)
+ return (err);
+
+ effective_value = psa->psa_effective_value;
+
+ /*
+ * If we are doing the preliminary check in open context, the
+ * space estimates may be inaccurate.
+ */
+ if (!dmu_tx_is_syncing(tx))
+ return (0);
+
+ mutex_enter(&dd->dd_lock);
+ used = dd->dd_phys->dd_used_bytes;
+ mutex_exit(&dd->dd_lock);
+
+ if (dd->dd_parent) {
+ avail = dsl_dir_space_available(dd->dd_parent,
+ NULL, 0, FALSE);
+ } else {
+ avail = dsl_pool_adjustedsize(dd->dd_pool, B_FALSE) - used;
+ }
+
+ if (MAX(used, effective_value) > MAX(used, dd->dd_phys->dd_reserved)) {
+ uint64_t delta = MAX(used, effective_value) -
+ MAX(used, dd->dd_phys->dd_reserved);
+
+ if (delta > avail)
+ return (ENOSPC);
+ if (dd->dd_phys->dd_quota > 0 &&
+ effective_value > dd->dd_phys->dd_quota)
+ return (ENOSPC);
+ }
+
+ return (0);
+}
+
+static void
+dsl_dir_set_reservation_sync(void *arg1, void *arg2, dmu_tx_t *tx)
+{
+ dsl_dataset_t *ds = arg1;
+ dsl_dir_t *dd = ds->ds_dir;
+ dsl_prop_setarg_t *psa = arg2;
+ uint64_t effective_value = psa->psa_effective_value;
+ uint64_t used;
+ int64_t delta;
+
+ dsl_prop_set_sync(ds, psa, tx);
+ DSL_PROP_CHECK_PREDICTION(dd, psa);
+
+ dmu_buf_will_dirty(dd->dd_dbuf, tx);
+
+ mutex_enter(&dd->dd_lock);
+ used = dd->dd_phys->dd_used_bytes;
+ delta = MAX(used, effective_value) -
+ MAX(used, dd->dd_phys->dd_reserved);
+ dd->dd_phys->dd_reserved = effective_value;
+
+ if (dd->dd_parent != NULL) {
+ /* Roll up this additional usage into our ancestors */
+ dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV,
+ delta, 0, 0, tx);
+ }
+ mutex_exit(&dd->dd_lock);
+
+ spa_history_log_internal(LOG_DS_RESERVATION, dd->dd_pool->dp_spa,
+ tx, "%lld dataset = %llu",
+ (longlong_t)effective_value, dd->dd_phys->dd_head_dataset_obj);
+}
+
+int
+dsl_dir_set_reservation(const char *ddname, zprop_source_t source,
+ uint64_t reservation)
+{
+ dsl_dir_t *dd;
+ dsl_dataset_t *ds;
+ dsl_prop_setarg_t psa;
+ int err;
+
+ dsl_prop_setarg_init_uint64(&psa, "reservation", source, &reservation);
+
+ err = dsl_dataset_hold(ddname, FTAG, &ds);
+ if (err)
+ return (err);
+
+ err = dsl_dir_open(ddname, FTAG, &dd, NULL);
+ if (err) {
+ dsl_dataset_rele(ds, FTAG);
+ return (err);
+ }
+
+ ASSERT(ds->ds_dir == dd);
+
+ err = dsl_sync_task_do(dd->dd_pool, dsl_dir_set_reservation_check,
+ dsl_dir_set_reservation_sync, ds, &psa, 0);
+
+ dsl_dir_close(dd, FTAG);
+ dsl_dataset_rele(ds, FTAG);
+ return (err);
+}
+
+static dsl_dir_t *
+closest_common_ancestor(dsl_dir_t *ds1, dsl_dir_t *ds2)
+{
+ for (; ds1; ds1 = ds1->dd_parent) {
+ dsl_dir_t *dd;
+ for (dd = ds2; dd; dd = dd->dd_parent) {
+ if (ds1 == dd)
+ return (dd);
+ }
+ }
+ return (NULL);
+}
+
+/*
+ * If delta is applied to dd, how much of that delta would be applied to
+ * ancestor? Syncing context only.
+ */
+static int64_t
+would_change(dsl_dir_t *dd, int64_t delta, dsl_dir_t *ancestor)
+{
+ if (dd == ancestor)
+ return (delta);
+
+ mutex_enter(&dd->dd_lock);
+ delta = parent_delta(dd, dd->dd_phys->dd_used_bytes, delta);
+ mutex_exit(&dd->dd_lock);
+ return (would_change(dd->dd_parent, delta, ancestor));
+}
+
+struct renamearg {
+ dsl_dir_t *newparent;
+ const char *mynewname;
+};
+
+static int
+dsl_dir_rename_check(void *arg1, void *arg2, dmu_tx_t *tx)
+{
+ dsl_dir_t *dd = arg1;
+ struct renamearg *ra = arg2;
+ dsl_pool_t *dp = dd->dd_pool;
+ objset_t *mos = dp->dp_meta_objset;
+ int err;
+ uint64_t val;
+
+ /*
+ * There should only be one reference, from dmu_objset_rename().
+ * Fleeting holds are also possible (eg, from "zfs list" getting
+ * stats), but any that are present in open context will likely
+ * be gone by syncing context, so only fail from syncing
+ * context.
+ */
+ if (dmu_tx_is_syncing(tx) && dmu_buf_refcount(dd->dd_dbuf) > 1)
+ return (EBUSY);
+
+ /* check for existing name */
+ err = zap_lookup(mos, ra->newparent->dd_phys->dd_child_dir_zapobj,
+ ra->mynewname, 8, 1, &val);
+ if (err == 0)
+ return (EEXIST);
+ if (err != ENOENT)
+ return (err);
+
+ if (ra->newparent != dd->dd_parent) {
+ /* is there enough space? */
+ uint64_t myspace =
+ MAX(dd->dd_phys->dd_used_bytes, dd->dd_phys->dd_reserved);
+
+ /* no rename into our descendant */
+ if (closest_common_ancestor(dd, ra->newparent) == dd)
+ return (EINVAL);
+
+ if (err = dsl_dir_transfer_possible(dd->dd_parent,
+ ra->newparent, myspace))
+ return (err);
+ }
+
+ return (0);
+}
+
+static void
+dsl_dir_rename_sync(void *arg1, void *arg2, dmu_tx_t *tx)
+{
+ dsl_dir_t *dd = arg1;
+ struct renamearg *ra = arg2;
+ dsl_pool_t *dp = dd->dd_pool;
+ objset_t *mos = dp->dp_meta_objset;
+ int err;
+
+ ASSERT(dmu_buf_refcount(dd->dd_dbuf) <= 2);
+
+ if (ra->newparent != dd->dd_parent) {
+ dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD,
+ -dd->dd_phys->dd_used_bytes,
+ -dd->dd_phys->dd_compressed_bytes,
+ -dd->dd_phys->dd_uncompressed_bytes, tx);
+ dsl_dir_diduse_space(ra->newparent, DD_USED_CHILD,
+ dd->dd_phys->dd_used_bytes,
+ dd->dd_phys->dd_compressed_bytes,
+ dd->dd_phys->dd_uncompressed_bytes, tx);
+
+ if (dd->dd_phys->dd_reserved > dd->dd_phys->dd_used_bytes) {
+ uint64_t unused_rsrv = dd->dd_phys->dd_reserved -
+ dd->dd_phys->dd_used_bytes;
+
+ dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV,
+ -unused_rsrv, 0, 0, tx);
+ dsl_dir_diduse_space(ra->newparent, DD_USED_CHILD_RSRV,
+ unused_rsrv, 0, 0, tx);
+ }
+ }
+
+ dmu_buf_will_dirty(dd->dd_dbuf, tx);
+
+ /* remove from old parent zapobj */
+ err = zap_remove(mos, dd->dd_parent->dd_phys->dd_child_dir_zapobj,
+ dd->dd_myname, tx);
+ ASSERT3U(err, ==, 0);
+
+ (void) strcpy(dd->dd_myname, ra->mynewname);
+ dsl_dir_close(dd->dd_parent, dd);
+ dd->dd_phys->dd_parent_obj = ra->newparent->dd_object;
+ VERIFY(0 == dsl_dir_open_obj(dd->dd_pool,
+ ra->newparent->dd_object, NULL, dd, &dd->dd_parent));
+
+ /* add to new parent zapobj */
+ err = zap_add(mos, ra->newparent->dd_phys->dd_child_dir_zapobj,
+ dd->dd_myname, 8, 1, &dd->dd_object, tx);
+ ASSERT3U(err, ==, 0);
+
+ spa_history_log_internal(LOG_DS_RENAME, dd->dd_pool->dp_spa,
+ tx, "dataset = %llu", dd->dd_phys->dd_head_dataset_obj);
+}
+
+int
+dsl_dir_rename(dsl_dir_t *dd, const char *newname)
+{
+ struct renamearg ra;
+ int err;
+
+ /* new parent should exist */
+ err = dsl_dir_open(newname, FTAG, &ra.newparent, &ra.mynewname);
+ if (err)
+ return (err);
+
+ /* can't rename to different pool */
+ if (dd->dd_pool != ra.newparent->dd_pool) {
+ err = ENXIO;
+ goto out;
+ }
+
+ /* new name should not already exist */
+ if (ra.mynewname == NULL) {
+ err = EEXIST;
+ goto out;
+ }
+
+ err = dsl_sync_task_do(dd->dd_pool,
+ dsl_dir_rename_check, dsl_dir_rename_sync, dd, &ra, 3);
+
+out:
+ dsl_dir_close(ra.newparent, FTAG);
+ return (err);
+}
+
+int
+dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd, uint64_t space)
+{
+ dsl_dir_t *ancestor;
+ int64_t adelta;
+ uint64_t avail;
+
+ ancestor = closest_common_ancestor(sdd, tdd);
+ adelta = would_change(sdd, -space, ancestor);
+ avail = dsl_dir_space_available(tdd, ancestor, adelta, FALSE);
+ if (avail < space)
+ return (ENOSPC);
+
+ return (0);
+}
+
+timestruc_t
+dsl_dir_snap_cmtime(dsl_dir_t *dd)
+{
+ timestruc_t t;
+
+ mutex_enter(&dd->dd_lock);
+ t = dd->dd_snap_cmtime;
+ mutex_exit(&dd->dd_lock);
+
+ return (t);
+}
+
+void
+dsl_dir_snap_cmtime_update(dsl_dir_t *dd)
+{
+ timestruc_t t;
+
+ gethrestime(&t);
+ mutex_enter(&dd->dd_lock);
+ dd->dd_snap_cmtime = t;
+ mutex_exit(&dd->dd_lock);
+}