aboutsummaryrefslogtreecommitdiffstats
path: root/uts/common/fs/zfs/dmu_objset.c
diff options
context:
space:
mode:
Diffstat (limited to 'uts/common/fs/zfs/dmu_objset.c')
-rw-r--r--uts/common/fs/zfs/dmu_objset.c1789
1 files changed, 1789 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/dmu_objset.c b/uts/common/fs/zfs/dmu_objset.c
new file mode 100644
index 000000000000..7caebd979f02
--- /dev/null
+++ b/uts/common/fs/zfs/dmu_objset.c
@@ -0,0 +1,1789 @@
+/*
+ * 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.
+ */
+
+/* Portions Copyright 2010 Robert Milkowski */
+
+#include <sys/cred.h>
+#include <sys/zfs_context.h>
+#include <sys/dmu_objset.h>
+#include <sys/dsl_dir.h>
+#include <sys/dsl_dataset.h>
+#include <sys/dsl_prop.h>
+#include <sys/dsl_pool.h>
+#include <sys/dsl_synctask.h>
+#include <sys/dsl_deleg.h>
+#include <sys/dnode.h>
+#include <sys/dbuf.h>
+#include <sys/zvol.h>
+#include <sys/dmu_tx.h>
+#include <sys/zap.h>
+#include <sys/zil.h>
+#include <sys/dmu_impl.h>
+#include <sys/zfs_ioctl.h>
+#include <sys/sa.h>
+#include <sys/zfs_onexit.h>
+
+/*
+ * Needed to close a window in dnode_move() that allows the objset to be freed
+ * before it can be safely accessed.
+ */
+krwlock_t os_lock;
+
+void
+dmu_objset_init(void)
+{
+ rw_init(&os_lock, NULL, RW_DEFAULT, NULL);
+}
+
+void
+dmu_objset_fini(void)
+{
+ rw_destroy(&os_lock);
+}
+
+spa_t *
+dmu_objset_spa(objset_t *os)
+{
+ return (os->os_spa);
+}
+
+zilog_t *
+dmu_objset_zil(objset_t *os)
+{
+ return (os->os_zil);
+}
+
+dsl_pool_t *
+dmu_objset_pool(objset_t *os)
+{
+ dsl_dataset_t *ds;
+
+ if ((ds = os->os_dsl_dataset) != NULL && ds->ds_dir)
+ return (ds->ds_dir->dd_pool);
+ else
+ return (spa_get_dsl(os->os_spa));
+}
+
+dsl_dataset_t *
+dmu_objset_ds(objset_t *os)
+{
+ return (os->os_dsl_dataset);
+}
+
+dmu_objset_type_t
+dmu_objset_type(objset_t *os)
+{
+ return (os->os_phys->os_type);
+}
+
+void
+dmu_objset_name(objset_t *os, char *buf)
+{
+ dsl_dataset_name(os->os_dsl_dataset, buf);
+}
+
+uint64_t
+dmu_objset_id(objset_t *os)
+{
+ dsl_dataset_t *ds = os->os_dsl_dataset;
+
+ return (ds ? ds->ds_object : 0);
+}
+
+uint64_t
+dmu_objset_syncprop(objset_t *os)
+{
+ return (os->os_sync);
+}
+
+uint64_t
+dmu_objset_logbias(objset_t *os)
+{
+ return (os->os_logbias);
+}
+
+static void
+checksum_changed_cb(void *arg, uint64_t newval)
+{
+ objset_t *os = arg;
+
+ /*
+ * Inheritance should have been done by now.
+ */
+ ASSERT(newval != ZIO_CHECKSUM_INHERIT);
+
+ os->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE);
+}
+
+static void
+compression_changed_cb(void *arg, uint64_t newval)
+{
+ objset_t *os = arg;
+
+ /*
+ * Inheritance and range checking should have been done by now.
+ */
+ ASSERT(newval != ZIO_COMPRESS_INHERIT);
+
+ os->os_compress = zio_compress_select(newval, ZIO_COMPRESS_ON_VALUE);
+}
+
+static void
+copies_changed_cb(void *arg, uint64_t newval)
+{
+ objset_t *os = arg;
+
+ /*
+ * Inheritance and range checking should have been done by now.
+ */
+ ASSERT(newval > 0);
+ ASSERT(newval <= spa_max_replication(os->os_spa));
+
+ os->os_copies = newval;
+}
+
+static void
+dedup_changed_cb(void *arg, uint64_t newval)
+{
+ objset_t *os = arg;
+ spa_t *spa = os->os_spa;
+ enum zio_checksum checksum;
+
+ /*
+ * Inheritance should have been done by now.
+ */
+ ASSERT(newval != ZIO_CHECKSUM_INHERIT);
+
+ checksum = zio_checksum_dedup_select(spa, newval, ZIO_CHECKSUM_OFF);
+
+ os->os_dedup_checksum = checksum & ZIO_CHECKSUM_MASK;
+ os->os_dedup_verify = !!(checksum & ZIO_CHECKSUM_VERIFY);
+}
+
+static void
+primary_cache_changed_cb(void *arg, uint64_t newval)
+{
+ objset_t *os = arg;
+
+ /*
+ * Inheritance and range checking should have been done by now.
+ */
+ ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
+ newval == ZFS_CACHE_METADATA);
+
+ os->os_primary_cache = newval;
+}
+
+static void
+secondary_cache_changed_cb(void *arg, uint64_t newval)
+{
+ objset_t *os = arg;
+
+ /*
+ * Inheritance and range checking should have been done by now.
+ */
+ ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
+ newval == ZFS_CACHE_METADATA);
+
+ os->os_secondary_cache = newval;
+}
+
+static void
+sync_changed_cb(void *arg, uint64_t newval)
+{
+ objset_t *os = arg;
+
+ /*
+ * Inheritance and range checking should have been done by now.
+ */
+ ASSERT(newval == ZFS_SYNC_STANDARD || newval == ZFS_SYNC_ALWAYS ||
+ newval == ZFS_SYNC_DISABLED);
+
+ os->os_sync = newval;
+ if (os->os_zil)
+ zil_set_sync(os->os_zil, newval);
+}
+
+static void
+logbias_changed_cb(void *arg, uint64_t newval)
+{
+ objset_t *os = arg;
+
+ ASSERT(newval == ZFS_LOGBIAS_LATENCY ||
+ newval == ZFS_LOGBIAS_THROUGHPUT);
+ os->os_logbias = newval;
+ if (os->os_zil)
+ zil_set_logbias(os->os_zil, newval);
+}
+
+void
+dmu_objset_byteswap(void *buf, size_t size)
+{
+ objset_phys_t *osp = buf;
+
+ ASSERT(size == OBJSET_OLD_PHYS_SIZE || size == sizeof (objset_phys_t));
+ dnode_byteswap(&osp->os_meta_dnode);
+ byteswap_uint64_array(&osp->os_zil_header, sizeof (zil_header_t));
+ osp->os_type = BSWAP_64(osp->os_type);
+ osp->os_flags = BSWAP_64(osp->os_flags);
+ if (size == sizeof (objset_phys_t)) {
+ dnode_byteswap(&osp->os_userused_dnode);
+ dnode_byteswap(&osp->os_groupused_dnode);
+ }
+}
+
+int
+dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
+ objset_t **osp)
+{
+ objset_t *os;
+ int i, err;
+
+ ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock));
+
+ os = kmem_zalloc(sizeof (objset_t), KM_SLEEP);
+ os->os_dsl_dataset = ds;
+ os->os_spa = spa;
+ os->os_rootbp = bp;
+ if (!BP_IS_HOLE(os->os_rootbp)) {
+ uint32_t aflags = ARC_WAIT;
+ zbookmark_t zb;
+ SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET,
+ ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
+
+ if (DMU_OS_IS_L2CACHEABLE(os))
+ aflags |= ARC_L2CACHE;
+
+ dprintf_bp(os->os_rootbp, "reading %s", "");
+ /*
+ * XXX when bprewrite scrub can change the bp,
+ * and this is called from dmu_objset_open_ds_os, the bp
+ * could change, and we'll need a lock.
+ */
+ err = dsl_read_nolock(NULL, spa, os->os_rootbp,
+ arc_getbuf_func, &os->os_phys_buf,
+ ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb);
+ if (err) {
+ kmem_free(os, sizeof (objset_t));
+ /* convert checksum errors into IO errors */
+ if (err == ECKSUM)
+ err = EIO;
+ return (err);
+ }
+
+ /* Increase the blocksize if we are permitted. */
+ if (spa_version(spa) >= SPA_VERSION_USERSPACE &&
+ arc_buf_size(os->os_phys_buf) < sizeof (objset_phys_t)) {
+ arc_buf_t *buf = arc_buf_alloc(spa,
+ sizeof (objset_phys_t), &os->os_phys_buf,
+ ARC_BUFC_METADATA);
+ bzero(buf->b_data, sizeof (objset_phys_t));
+ bcopy(os->os_phys_buf->b_data, buf->b_data,
+ arc_buf_size(os->os_phys_buf));
+ (void) arc_buf_remove_ref(os->os_phys_buf,
+ &os->os_phys_buf);
+ os->os_phys_buf = buf;
+ }
+
+ os->os_phys = os->os_phys_buf->b_data;
+ os->os_flags = os->os_phys->os_flags;
+ } else {
+ int size = spa_version(spa) >= SPA_VERSION_USERSPACE ?
+ sizeof (objset_phys_t) : OBJSET_OLD_PHYS_SIZE;
+ os->os_phys_buf = arc_buf_alloc(spa, size,
+ &os->os_phys_buf, ARC_BUFC_METADATA);
+ os->os_phys = os->os_phys_buf->b_data;
+ bzero(os->os_phys, size);
+ }
+
+ /*
+ * Note: the changed_cb will be called once before the register
+ * func returns, thus changing the checksum/compression from the
+ * default (fletcher2/off). Snapshots don't need to know about
+ * checksum/compression/copies.
+ */
+ if (ds) {
+ err = dsl_prop_register(ds, "primarycache",
+ primary_cache_changed_cb, os);
+ if (err == 0)
+ err = dsl_prop_register(ds, "secondarycache",
+ secondary_cache_changed_cb, os);
+ if (!dsl_dataset_is_snapshot(ds)) {
+ if (err == 0)
+ err = dsl_prop_register(ds, "checksum",
+ checksum_changed_cb, os);
+ if (err == 0)
+ err = dsl_prop_register(ds, "compression",
+ compression_changed_cb, os);
+ if (err == 0)
+ err = dsl_prop_register(ds, "copies",
+ copies_changed_cb, os);
+ if (err == 0)
+ err = dsl_prop_register(ds, "dedup",
+ dedup_changed_cb, os);
+ if (err == 0)
+ err = dsl_prop_register(ds, "logbias",
+ logbias_changed_cb, os);
+ if (err == 0)
+ err = dsl_prop_register(ds, "sync",
+ sync_changed_cb, os);
+ }
+ if (err) {
+ VERIFY(arc_buf_remove_ref(os->os_phys_buf,
+ &os->os_phys_buf) == 1);
+ kmem_free(os, sizeof (objset_t));
+ return (err);
+ }
+ } else if (ds == NULL) {
+ /* It's the meta-objset. */
+ os->os_checksum = ZIO_CHECKSUM_FLETCHER_4;
+ os->os_compress = ZIO_COMPRESS_LZJB;
+ os->os_copies = spa_max_replication(spa);
+ os->os_dedup_checksum = ZIO_CHECKSUM_OFF;
+ os->os_dedup_verify = 0;
+ os->os_logbias = 0;
+ os->os_sync = 0;
+ os->os_primary_cache = ZFS_CACHE_ALL;
+ os->os_secondary_cache = ZFS_CACHE_ALL;
+ }
+
+ if (ds == NULL || !dsl_dataset_is_snapshot(ds))
+ os->os_zil_header = os->os_phys->os_zil_header;
+ os->os_zil = zil_alloc(os, &os->os_zil_header);
+
+ for (i = 0; i < TXG_SIZE; i++) {
+ list_create(&os->os_dirty_dnodes[i], sizeof (dnode_t),
+ offsetof(dnode_t, dn_dirty_link[i]));
+ list_create(&os->os_free_dnodes[i], sizeof (dnode_t),
+ offsetof(dnode_t, dn_dirty_link[i]));
+ }
+ list_create(&os->os_dnodes, sizeof (dnode_t),
+ offsetof(dnode_t, dn_link));
+ list_create(&os->os_downgraded_dbufs, sizeof (dmu_buf_impl_t),
+ offsetof(dmu_buf_impl_t, db_link));
+
+ mutex_init(&os->os_lock, NULL, MUTEX_DEFAULT, NULL);
+ mutex_init(&os->os_obj_lock, NULL, MUTEX_DEFAULT, NULL);
+ mutex_init(&os->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL);
+
+ DMU_META_DNODE(os) = dnode_special_open(os,
+ &os->os_phys->os_meta_dnode, DMU_META_DNODE_OBJECT,
+ &os->os_meta_dnode);
+ if (arc_buf_size(os->os_phys_buf) >= sizeof (objset_phys_t)) {
+ DMU_USERUSED_DNODE(os) = dnode_special_open(os,
+ &os->os_phys->os_userused_dnode, DMU_USERUSED_OBJECT,
+ &os->os_userused_dnode);
+ DMU_GROUPUSED_DNODE(os) = dnode_special_open(os,
+ &os->os_phys->os_groupused_dnode, DMU_GROUPUSED_OBJECT,
+ &os->os_groupused_dnode);
+ }
+
+ /*
+ * We should be the only thread trying to do this because we
+ * have ds_opening_lock
+ */
+ if (ds) {
+ mutex_enter(&ds->ds_lock);
+ ASSERT(ds->ds_objset == NULL);
+ ds->ds_objset = os;
+ mutex_exit(&ds->ds_lock);
+ }
+
+ *osp = os;
+ return (0);
+}
+
+int
+dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp)
+{
+ int err = 0;
+
+ mutex_enter(&ds->ds_opening_lock);
+ *osp = ds->ds_objset;
+ if (*osp == NULL) {
+ err = dmu_objset_open_impl(dsl_dataset_get_spa(ds),
+ ds, dsl_dataset_get_blkptr(ds), osp);
+ }
+ mutex_exit(&ds->ds_opening_lock);
+ return (err);
+}
+
+/* called from zpl */
+int
+dmu_objset_hold(const char *name, void *tag, objset_t **osp)
+{
+ dsl_dataset_t *ds;
+ int err;
+
+ err = dsl_dataset_hold(name, tag, &ds);
+ if (err)
+ return (err);
+
+ err = dmu_objset_from_ds(ds, osp);
+ if (err)
+ dsl_dataset_rele(ds, tag);
+
+ return (err);
+}
+
+/* called from zpl */
+int
+dmu_objset_own(const char *name, dmu_objset_type_t type,
+ boolean_t readonly, void *tag, objset_t **osp)
+{
+ dsl_dataset_t *ds;
+ int err;
+
+ err = dsl_dataset_own(name, B_FALSE, tag, &ds);
+ if (err)
+ return (err);
+
+ err = dmu_objset_from_ds(ds, osp);
+ if (err) {
+ dsl_dataset_disown(ds, tag);
+ } else if (type != DMU_OST_ANY && type != (*osp)->os_phys->os_type) {
+ dmu_objset_disown(*osp, tag);
+ return (EINVAL);
+ } else if (!readonly && dsl_dataset_is_snapshot(ds)) {
+ dmu_objset_disown(*osp, tag);
+ return (EROFS);
+ }
+ return (err);
+}
+
+void
+dmu_objset_rele(objset_t *os, void *tag)
+{
+ dsl_dataset_rele(os->os_dsl_dataset, tag);
+}
+
+void
+dmu_objset_disown(objset_t *os, void *tag)
+{
+ dsl_dataset_disown(os->os_dsl_dataset, tag);
+}
+
+int
+dmu_objset_evict_dbufs(objset_t *os)
+{
+ dnode_t *dn;
+
+ mutex_enter(&os->os_lock);
+
+ /* process the mdn last, since the other dnodes have holds on it */
+ list_remove(&os->os_dnodes, DMU_META_DNODE(os));
+ list_insert_tail(&os->os_dnodes, DMU_META_DNODE(os));
+
+ /*
+ * Find the first dnode with holds. We have to do this dance
+ * because dnode_add_ref() only works if you already have a
+ * hold. If there are no holds then it has no dbufs so OK to
+ * skip.
+ */
+ for (dn = list_head(&os->os_dnodes);
+ dn && !dnode_add_ref(dn, FTAG);
+ dn = list_next(&os->os_dnodes, dn))
+ continue;
+
+ while (dn) {
+ dnode_t *next_dn = dn;
+
+ do {
+ next_dn = list_next(&os->os_dnodes, next_dn);
+ } while (next_dn && !dnode_add_ref(next_dn, FTAG));
+
+ mutex_exit(&os->os_lock);
+ dnode_evict_dbufs(dn);
+ dnode_rele(dn, FTAG);
+ mutex_enter(&os->os_lock);
+ dn = next_dn;
+ }
+ dn = list_head(&os->os_dnodes);
+ mutex_exit(&os->os_lock);
+ return (dn != DMU_META_DNODE(os));
+}
+
+void
+dmu_objset_evict(objset_t *os)
+{
+ dsl_dataset_t *ds = os->os_dsl_dataset;
+
+ for (int t = 0; t < TXG_SIZE; t++)
+ ASSERT(!dmu_objset_is_dirty(os, t));
+
+ if (ds) {
+ if (!dsl_dataset_is_snapshot(ds)) {
+ VERIFY(0 == dsl_prop_unregister(ds, "checksum",
+ checksum_changed_cb, os));
+ VERIFY(0 == dsl_prop_unregister(ds, "compression",
+ compression_changed_cb, os));
+ VERIFY(0 == dsl_prop_unregister(ds, "copies",
+ copies_changed_cb, os));
+ VERIFY(0 == dsl_prop_unregister(ds, "dedup",
+ dedup_changed_cb, os));
+ VERIFY(0 == dsl_prop_unregister(ds, "logbias",
+ logbias_changed_cb, os));
+ VERIFY(0 == dsl_prop_unregister(ds, "sync",
+ sync_changed_cb, os));
+ }
+ VERIFY(0 == dsl_prop_unregister(ds, "primarycache",
+ primary_cache_changed_cb, os));
+ VERIFY(0 == dsl_prop_unregister(ds, "secondarycache",
+ secondary_cache_changed_cb, os));
+ }
+
+ if (os->os_sa)
+ sa_tear_down(os);
+
+ /*
+ * We should need only a single pass over the dnode list, since
+ * nothing can be added to the list at this point.
+ */
+ (void) dmu_objset_evict_dbufs(os);
+
+ dnode_special_close(&os->os_meta_dnode);
+ if (DMU_USERUSED_DNODE(os)) {
+ dnode_special_close(&os->os_userused_dnode);
+ dnode_special_close(&os->os_groupused_dnode);
+ }
+ zil_free(os->os_zil);
+
+ ASSERT3P(list_head(&os->os_dnodes), ==, NULL);
+
+ VERIFY(arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf) == 1);
+
+ /*
+ * This is a barrier to prevent the objset from going away in
+ * dnode_move() until we can safely ensure that the objset is still in
+ * use. We consider the objset valid before the barrier and invalid
+ * after the barrier.
+ */
+ rw_enter(&os_lock, RW_READER);
+ rw_exit(&os_lock);
+
+ mutex_destroy(&os->os_lock);
+ mutex_destroy(&os->os_obj_lock);
+ mutex_destroy(&os->os_user_ptr_lock);
+ kmem_free(os, sizeof (objset_t));
+}
+
+timestruc_t
+dmu_objset_snap_cmtime(objset_t *os)
+{
+ return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir));
+}
+
+/* called from dsl for meta-objset */
+objset_t *
+dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
+ dmu_objset_type_t type, dmu_tx_t *tx)
+{
+ objset_t *os;
+ dnode_t *mdn;
+
+ ASSERT(dmu_tx_is_syncing(tx));
+ if (ds != NULL)
+ VERIFY(0 == dmu_objset_from_ds(ds, &os));
+ else
+ VERIFY(0 == dmu_objset_open_impl(spa, NULL, bp, &os));
+
+ mdn = DMU_META_DNODE(os);
+
+ dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT,
+ DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx);
+
+ /*
+ * We don't want to have to increase the meta-dnode's nlevels
+ * later, because then we could do it in quescing context while
+ * we are also accessing it in open context.
+ *
+ * This precaution is not necessary for the MOS (ds == NULL),
+ * because the MOS is only updated in syncing context.
+ * This is most fortunate: the MOS is the only objset that
+ * needs to be synced multiple times as spa_sync() iterates
+ * to convergence, so minimizing its dn_nlevels matters.
+ */
+ if (ds != NULL) {
+ int levels = 1;
+
+ /*
+ * Determine the number of levels necessary for the meta-dnode
+ * to contain DN_MAX_OBJECT dnodes.
+ */
+ while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift +
+ (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) <
+ DN_MAX_OBJECT * sizeof (dnode_phys_t))
+ levels++;
+
+ mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] =
+ mdn->dn_nlevels = levels;
+ }
+
+ ASSERT(type != DMU_OST_NONE);
+ ASSERT(type != DMU_OST_ANY);
+ ASSERT(type < DMU_OST_NUMTYPES);
+ os->os_phys->os_type = type;
+ if (dmu_objset_userused_enabled(os)) {
+ os->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE;
+ os->os_flags = os->os_phys->os_flags;
+ }
+
+ dsl_dataset_dirty(ds, tx);
+
+ return (os);
+}
+
+struct oscarg {
+ void (*userfunc)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx);
+ void *userarg;
+ dsl_dataset_t *clone_origin;
+ const char *lastname;
+ dmu_objset_type_t type;
+ uint64_t flags;
+ cred_t *cr;
+};
+
+/*ARGSUSED*/
+static int
+dmu_objset_create_check(void *arg1, void *arg2, dmu_tx_t *tx)
+{
+ dsl_dir_t *dd = arg1;
+ struct oscarg *oa = arg2;
+ objset_t *mos = dd->dd_pool->dp_meta_objset;
+ int err;
+ uint64_t ddobj;
+
+ err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj,
+ oa->lastname, sizeof (uint64_t), 1, &ddobj);
+ if (err != ENOENT)
+ return (err ? err : EEXIST);
+
+ if (oa->clone_origin != NULL) {
+ /* You can't clone across pools. */
+ if (oa->clone_origin->ds_dir->dd_pool != dd->dd_pool)
+ return (EXDEV);
+
+ /* You can only clone snapshots, not the head datasets. */
+ if (!dsl_dataset_is_snapshot(oa->clone_origin))
+ return (EINVAL);
+ }
+
+ return (0);
+}
+
+static void
+dmu_objset_create_sync(void *arg1, void *arg2, dmu_tx_t *tx)
+{
+ dsl_dir_t *dd = arg1;
+ spa_t *spa = dd->dd_pool->dp_spa;
+ struct oscarg *oa = arg2;
+ uint64_t obj;
+
+ ASSERT(dmu_tx_is_syncing(tx));
+
+ obj = dsl_dataset_create_sync(dd, oa->lastname,
+ oa->clone_origin, oa->flags, oa->cr, tx);
+
+ if (oa->clone_origin == NULL) {
+ dsl_pool_t *dp = dd->dd_pool;
+ dsl_dataset_t *ds;
+ blkptr_t *bp;
+ objset_t *os;
+
+ VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, obj, FTAG, &ds));
+ bp = dsl_dataset_get_blkptr(ds);
+ ASSERT(BP_IS_HOLE(bp));
+
+ os = dmu_objset_create_impl(spa, ds, bp, oa->type, tx);
+
+ if (oa->userfunc)
+ oa->userfunc(os, oa->userarg, oa->cr, tx);
+ dsl_dataset_rele(ds, FTAG);
+ }
+
+ spa_history_log_internal(LOG_DS_CREATE, spa, tx, "dataset = %llu", obj);
+}
+
+int
+dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags,
+ void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg)
+{
+ dsl_dir_t *pdd;
+ const char *tail;
+ int err = 0;
+ struct oscarg oa = { 0 };
+
+ ASSERT(strchr(name, '@') == NULL);
+ err = dsl_dir_open(name, FTAG, &pdd, &tail);
+ if (err)
+ return (err);
+ if (tail == NULL) {
+ dsl_dir_close(pdd, FTAG);
+ return (EEXIST);
+ }
+
+ oa.userfunc = func;
+ oa.userarg = arg;
+ oa.lastname = tail;
+ oa.type = type;
+ oa.flags = flags;
+ oa.cr = CRED();
+
+ err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check,
+ dmu_objset_create_sync, pdd, &oa, 5);
+ dsl_dir_close(pdd, FTAG);
+ return (err);
+}
+
+int
+dmu_objset_clone(const char *name, dsl_dataset_t *clone_origin, uint64_t flags)
+{
+ dsl_dir_t *pdd;
+ const char *tail;
+ int err = 0;
+ struct oscarg oa = { 0 };
+
+ ASSERT(strchr(name, '@') == NULL);
+ err = dsl_dir_open(name, FTAG, &pdd, &tail);
+ if (err)
+ return (err);
+ if (tail == NULL) {
+ dsl_dir_close(pdd, FTAG);
+ return (EEXIST);
+ }
+
+ oa.lastname = tail;
+ oa.clone_origin = clone_origin;
+ oa.flags = flags;
+ oa.cr = CRED();
+
+ err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check,
+ dmu_objset_create_sync, pdd, &oa, 5);
+ dsl_dir_close(pdd, FTAG);
+ return (err);
+}
+
+int
+dmu_objset_destroy(const char *name, boolean_t defer)
+{
+ dsl_dataset_t *ds;
+ int error;
+
+ error = dsl_dataset_own(name, B_TRUE, FTAG, &ds);
+ if (error == 0) {
+ error = dsl_dataset_destroy(ds, FTAG, defer);
+ /* dsl_dataset_destroy() closes the ds. */
+ }
+
+ return (error);
+}
+
+struct snaparg {
+ dsl_sync_task_group_t *dstg;
+ char *snapname;
+ char *htag;
+ char failed[MAXPATHLEN];
+ boolean_t recursive;
+ boolean_t needsuspend;
+ boolean_t temporary;
+ nvlist_t *props;
+ struct dsl_ds_holdarg *ha; /* only needed in the temporary case */
+ dsl_dataset_t *newds;
+};
+
+static int
+snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx)
+{
+ objset_t *os = arg1;
+ struct snaparg *sn = arg2;
+ int error;
+
+ /* The props have already been checked by zfs_check_userprops(). */
+
+ error = dsl_dataset_snapshot_check(os->os_dsl_dataset,
+ sn->snapname, tx);
+ if (error)
+ return (error);
+
+ if (sn->temporary) {
+ /*
+ * Ideally we would just call
+ * dsl_dataset_user_hold_check() and
+ * dsl_dataset_destroy_check() here. However the
+ * dataset we want to hold and destroy is the snapshot
+ * that we just confirmed we can create, but it won't
+ * exist until after these checks are run. Do any
+ * checks we can here and if more checks are added to
+ * those routines in the future, similar checks may be
+ * necessary here.
+ */
+ if (spa_version(os->os_spa) < SPA_VERSION_USERREFS)
+ return (ENOTSUP);
+ /*
+ * Not checking number of tags because the tag will be
+ * unique, as it will be the only tag.
+ */
+ if (strlen(sn->htag) + MAX_TAG_PREFIX_LEN >= MAXNAMELEN)
+ return (E2BIG);
+
+ sn->ha = kmem_alloc(sizeof (struct dsl_ds_holdarg), KM_SLEEP);
+ sn->ha->temphold = B_TRUE;
+ sn->ha->htag = sn->htag;
+ }
+ return (error);
+}
+
+static void
+snapshot_sync(void *arg1, void *arg2, dmu_tx_t *tx)
+{
+ objset_t *os = arg1;
+ dsl_dataset_t *ds = os->os_dsl_dataset;
+ struct snaparg *sn = arg2;
+
+ dsl_dataset_snapshot_sync(ds, sn->snapname, tx);
+
+ if (sn->props) {
+ dsl_props_arg_t pa;
+ pa.pa_props = sn->props;
+ pa.pa_source = ZPROP_SRC_LOCAL;
+ dsl_props_set_sync(ds->ds_prev, &pa, tx);
+ }
+
+ if (sn->temporary) {
+ struct dsl_ds_destroyarg da;
+
+ dsl_dataset_user_hold_sync(ds->ds_prev, sn->ha, tx);
+ kmem_free(sn->ha, sizeof (struct dsl_ds_holdarg));
+ sn->ha = NULL;
+ sn->newds = ds->ds_prev;
+
+ da.ds = ds->ds_prev;
+ da.defer = B_TRUE;
+ dsl_dataset_destroy_sync(&da, FTAG, tx);
+ }
+}
+
+static int
+dmu_objset_snapshot_one(const char *name, void *arg)
+{
+ struct snaparg *sn = arg;
+ objset_t *os;
+ int err;
+ char *cp;
+
+ /*
+ * If the objset starts with a '%', then ignore it unless it was
+ * explicitly named (ie, not recursive). These hidden datasets
+ * are always inconsistent, and by not opening them here, we can
+ * avoid a race with dsl_dir_destroy_check().
+ */
+ cp = strrchr(name, '/');
+ if (cp && cp[1] == '%' && sn->recursive)
+ return (0);
+
+ (void) strcpy(sn->failed, name);
+
+ /*
+ * Check permissions if we are doing a recursive snapshot. The
+ * permission checks for the starting dataset have already been
+ * performed in zfs_secpolicy_snapshot()
+ */
+ if (sn->recursive && (err = zfs_secpolicy_snapshot_perms(name, CRED())))
+ return (err);
+
+ err = dmu_objset_hold(name, sn, &os);
+ if (err != 0)
+ return (err);
+
+ /*
+ * If the objset is in an inconsistent state (eg, in the process
+ * of being destroyed), don't snapshot it. As with %hidden
+ * datasets, we return EBUSY if this name was explicitly
+ * requested (ie, not recursive), and otherwise ignore it.
+ */
+ if (os->os_dsl_dataset->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) {
+ dmu_objset_rele(os, sn);
+ return (sn->recursive ? 0 : EBUSY);
+ }
+
+ if (sn->needsuspend) {
+ err = zil_suspend(dmu_objset_zil(os));
+ if (err) {
+ dmu_objset_rele(os, sn);
+ return (err);
+ }
+ }
+ dsl_sync_task_create(sn->dstg, snapshot_check, snapshot_sync,
+ os, sn, 3);
+
+ return (0);
+}
+
+int
+dmu_objset_snapshot(char *fsname, char *snapname, char *tag,
+ nvlist_t *props, boolean_t recursive, boolean_t temporary, int cleanup_fd)
+{
+ dsl_sync_task_t *dst;
+ struct snaparg sn;
+ spa_t *spa;
+ minor_t minor;
+ int err;
+
+ (void) strcpy(sn.failed, fsname);
+
+ err = spa_open(fsname, &spa, FTAG);
+ if (err)
+ return (err);
+
+ if (temporary) {
+ if (cleanup_fd < 0) {
+ spa_close(spa, FTAG);
+ return (EINVAL);
+ }
+ if ((err = zfs_onexit_fd_hold(cleanup_fd, &minor)) != 0) {
+ spa_close(spa, FTAG);
+ return (err);
+ }
+ }
+
+ sn.dstg = dsl_sync_task_group_create(spa_get_dsl(spa));
+ sn.snapname = snapname;
+ sn.htag = tag;
+ sn.props = props;
+ sn.recursive = recursive;
+ sn.needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
+ sn.temporary = temporary;
+ sn.ha = NULL;
+ sn.newds = NULL;
+
+ if (recursive) {
+ err = dmu_objset_find(fsname,
+ dmu_objset_snapshot_one, &sn, DS_FIND_CHILDREN);
+ } else {
+ err = dmu_objset_snapshot_one(fsname, &sn);
+ }
+
+ if (err == 0)
+ err = dsl_sync_task_group_wait(sn.dstg);
+
+ for (dst = list_head(&sn.dstg->dstg_tasks); dst;
+ dst = list_next(&sn.dstg->dstg_tasks, dst)) {
+ objset_t *os = dst->dst_arg1;
+ dsl_dataset_t *ds = os->os_dsl_dataset;
+ if (dst->dst_err) {
+ dsl_dataset_name(ds, sn.failed);
+ } else if (temporary) {
+ dsl_register_onexit_hold_cleanup(sn.newds, tag, minor);
+ }
+ if (sn.needsuspend)
+ zil_resume(dmu_objset_zil(os));
+ dmu_objset_rele(os, &sn);
+ }
+
+ if (err)
+ (void) strcpy(fsname, sn.failed);
+ if (temporary)
+ zfs_onexit_fd_rele(cleanup_fd);
+ dsl_sync_task_group_destroy(sn.dstg);
+ spa_close(spa, FTAG);
+ return (err);
+}
+
+static void
+dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx)
+{
+ dnode_t *dn;
+
+ while (dn = list_head(list)) {
+ ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT);
+ ASSERT(dn->dn_dbuf->db_data_pending);
+ /*
+ * Initialize dn_zio outside dnode_sync() because the
+ * meta-dnode needs to set it ouside dnode_sync().
+ */
+ dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio;
+ ASSERT(dn->dn_zio);
+
+ ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS);
+ list_remove(list, dn);
+
+ if (newlist) {
+ (void) dnode_add_ref(dn, newlist);
+ list_insert_tail(newlist, dn);
+ }
+
+ dnode_sync(dn, tx);
+ }
+}
+
+/* ARGSUSED */
+static void
+dmu_objset_write_ready(zio_t *zio, arc_buf_t *abuf, void *arg)
+{
+ blkptr_t *bp = zio->io_bp;
+ objset_t *os = arg;
+ dnode_phys_t *dnp = &os->os_phys->os_meta_dnode;
+
+ ASSERT(bp == os->os_rootbp);
+ ASSERT(BP_GET_TYPE(bp) == DMU_OT_OBJSET);
+ ASSERT(BP_GET_LEVEL(bp) == 0);
+
+ /*
+ * Update rootbp fill count: it should be the number of objects
+ * allocated in the object set (not counting the "special"
+ * objects that are stored in the objset_phys_t -- the meta
+ * dnode and user/group accounting objects).
+ */
+ bp->blk_fill = 0;
+ for (int i = 0; i < dnp->dn_nblkptr; i++)
+ bp->blk_fill += dnp->dn_blkptr[i].blk_fill;
+}
+
+/* ARGSUSED */
+static void
+dmu_objset_write_done(zio_t *zio, arc_buf_t *abuf, void *arg)
+{
+ blkptr_t *bp = zio->io_bp;
+ blkptr_t *bp_orig = &zio->io_bp_orig;
+ objset_t *os = arg;
+
+ if (zio->io_flags & ZIO_FLAG_IO_REWRITE) {
+ ASSERT(BP_EQUAL(bp, bp_orig));
+ } else {
+ dsl_dataset_t *ds = os->os_dsl_dataset;
+ dmu_tx_t *tx = os->os_synctx;
+
+ (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE);
+ dsl_dataset_block_born(ds, bp, tx);
+ }
+}
+
+/* called from dsl */
+void
+dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx)
+{
+ int txgoff;
+ zbookmark_t zb;
+ zio_prop_t zp;
+ zio_t *zio;
+ list_t *list;
+ list_t *newlist = NULL;
+ dbuf_dirty_record_t *dr;
+
+ dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg);
+
+ ASSERT(dmu_tx_is_syncing(tx));
+ /* XXX the write_done callback should really give us the tx... */
+ os->os_synctx = tx;
+
+ if (os->os_dsl_dataset == NULL) {
+ /*
+ * This is the MOS. If we have upgraded,
+ * spa_max_replication() could change, so reset
+ * os_copies here.
+ */
+ os->os_copies = spa_max_replication(os->os_spa);
+ }
+
+ /*
+ * Create the root block IO
+ */
+ SET_BOOKMARK(&zb, os->os_dsl_dataset ?
+ os->os_dsl_dataset->ds_object : DMU_META_OBJSET,
+ ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
+ VERIFY3U(0, ==, arc_release_bp(os->os_phys_buf, &os->os_phys_buf,
+ os->os_rootbp, os->os_spa, &zb));
+
+ dmu_write_policy(os, NULL, 0, 0, &zp);
+
+ zio = arc_write(pio, os->os_spa, tx->tx_txg,
+ os->os_rootbp, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os), &zp,
+ dmu_objset_write_ready, dmu_objset_write_done, os,
+ ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb);
+
+ /*
+ * Sync special dnodes - the parent IO for the sync is the root block
+ */
+ DMU_META_DNODE(os)->dn_zio = zio;
+ dnode_sync(DMU_META_DNODE(os), tx);
+
+ os->os_phys->os_flags = os->os_flags;
+
+ if (DMU_USERUSED_DNODE(os) &&
+ DMU_USERUSED_DNODE(os)->dn_type != DMU_OT_NONE) {
+ DMU_USERUSED_DNODE(os)->dn_zio = zio;
+ dnode_sync(DMU_USERUSED_DNODE(os), tx);
+ DMU_GROUPUSED_DNODE(os)->dn_zio = zio;
+ dnode_sync(DMU_GROUPUSED_DNODE(os), tx);
+ }
+
+ txgoff = tx->tx_txg & TXG_MASK;
+
+ if (dmu_objset_userused_enabled(os)) {
+ newlist = &os->os_synced_dnodes;
+ /*
+ * We must create the list here because it uses the
+ * dn_dirty_link[] of this txg.
+ */
+ list_create(newlist, sizeof (dnode_t),
+ offsetof(dnode_t, dn_dirty_link[txgoff]));
+ }
+
+ dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], newlist, tx);
+ dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx);
+
+ list = &DMU_META_DNODE(os)->dn_dirty_records[txgoff];
+ while (dr = list_head(list)) {
+ ASSERT(dr->dr_dbuf->db_level == 0);
+ list_remove(list, dr);
+ if (dr->dr_zio)
+ zio_nowait(dr->dr_zio);
+ }
+ /*
+ * Free intent log blocks up to this tx.
+ */
+ zil_sync(os->os_zil, tx);
+ os->os_phys->os_zil_header = os->os_zil_header;
+ zio_nowait(zio);
+}
+
+boolean_t
+dmu_objset_is_dirty(objset_t *os, uint64_t txg)
+{
+ return (!list_is_empty(&os->os_dirty_dnodes[txg & TXG_MASK]) ||
+ !list_is_empty(&os->os_free_dnodes[txg & TXG_MASK]));
+}
+
+boolean_t
+dmu_objset_is_dirty_anywhere(objset_t *os)
+{
+ for (int t = 0; t < TXG_SIZE; t++)
+ if (dmu_objset_is_dirty(os, t))
+ return (B_TRUE);
+ return (B_FALSE);
+}
+
+static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES];
+
+void
+dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb)
+{
+ used_cbs[ost] = cb;
+}
+
+boolean_t
+dmu_objset_userused_enabled(objset_t *os)
+{
+ return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE &&
+ used_cbs[os->os_phys->os_type] != NULL &&
+ DMU_USERUSED_DNODE(os) != NULL);
+}
+
+static void
+do_userquota_update(objset_t *os, uint64_t used, uint64_t flags,
+ uint64_t user, uint64_t group, boolean_t subtract, dmu_tx_t *tx)
+{
+ if ((flags & DNODE_FLAG_USERUSED_ACCOUNTED)) {
+ int64_t delta = DNODE_SIZE + used;
+ if (subtract)
+ delta = -delta;
+ VERIFY3U(0, ==, zap_increment_int(os, DMU_USERUSED_OBJECT,
+ user, delta, tx));
+ VERIFY3U(0, ==, zap_increment_int(os, DMU_GROUPUSED_OBJECT,
+ group, delta, tx));
+ }
+}
+
+void
+dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx)
+{
+ dnode_t *dn;
+ list_t *list = &os->os_synced_dnodes;
+
+ ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os));
+
+ while (dn = list_head(list)) {
+ int flags;
+ ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object));
+ ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE ||
+ dn->dn_phys->dn_flags &
+ DNODE_FLAG_USERUSED_ACCOUNTED);
+
+ /* Allocate the user/groupused objects if necessary. */
+ if (DMU_USERUSED_DNODE(os)->dn_type == DMU_OT_NONE) {
+ VERIFY(0 == zap_create_claim(os,
+ DMU_USERUSED_OBJECT,
+ DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx));
+ VERIFY(0 == zap_create_claim(os,
+ DMU_GROUPUSED_OBJECT,
+ DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx));
+ }
+
+ /*
+ * We intentionally modify the zap object even if the
+ * net delta is zero. Otherwise
+ * the block of the zap obj could be shared between
+ * datasets but need to be different between them after
+ * a bprewrite.
+ */
+
+ flags = dn->dn_id_flags;
+ ASSERT(flags);
+ if (flags & DN_ID_OLD_EXIST) {
+ do_userquota_update(os, dn->dn_oldused, dn->dn_oldflags,
+ dn->dn_olduid, dn->dn_oldgid, B_TRUE, tx);
+ }
+ if (flags & DN_ID_NEW_EXIST) {
+ do_userquota_update(os, DN_USED_BYTES(dn->dn_phys),
+ dn->dn_phys->dn_flags, dn->dn_newuid,
+ dn->dn_newgid, B_FALSE, tx);
+ }
+
+ mutex_enter(&dn->dn_mtx);
+ dn->dn_oldused = 0;
+ dn->dn_oldflags = 0;
+ if (dn->dn_id_flags & DN_ID_NEW_EXIST) {
+ dn->dn_olduid = dn->dn_newuid;
+ dn->dn_oldgid = dn->dn_newgid;
+ dn->dn_id_flags |= DN_ID_OLD_EXIST;
+ if (dn->dn_bonuslen == 0)
+ dn->dn_id_flags |= DN_ID_CHKED_SPILL;
+ else
+ dn->dn_id_flags |= DN_ID_CHKED_BONUS;
+ }
+ dn->dn_id_flags &= ~(DN_ID_NEW_EXIST);
+ mutex_exit(&dn->dn_mtx);
+
+ list_remove(list, dn);
+ dnode_rele(dn, list);
+ }
+}
+
+/*
+ * Returns a pointer to data to find uid/gid from
+ *
+ * If a dirty record for transaction group that is syncing can't
+ * be found then NULL is returned. In the NULL case it is assumed
+ * the uid/gid aren't changing.
+ */
+static void *
+dmu_objset_userquota_find_data(dmu_buf_impl_t *db, dmu_tx_t *tx)
+{
+ dbuf_dirty_record_t *dr, **drp;
+ void *data;
+
+ if (db->db_dirtycnt == 0)
+ return (db->db.db_data); /* Nothing is changing */
+
+ for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next)
+ if (dr->dr_txg == tx->tx_txg)
+ break;
+
+ if (dr == NULL) {
+ data = NULL;
+ } else {
+ dnode_t *dn;
+
+ DB_DNODE_ENTER(dr->dr_dbuf);
+ dn = DB_DNODE(dr->dr_dbuf);
+
+ if (dn->dn_bonuslen == 0 &&
+ dr->dr_dbuf->db_blkid == DMU_SPILL_BLKID)
+ data = dr->dt.dl.dr_data->b_data;
+ else
+ data = dr->dt.dl.dr_data;
+
+ DB_DNODE_EXIT(dr->dr_dbuf);
+ }
+
+ return (data);
+}
+
+void
+dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx)
+{
+ objset_t *os = dn->dn_objset;
+ void *data = NULL;
+ dmu_buf_impl_t *db = NULL;
+ uint64_t *user, *group;
+ int flags = dn->dn_id_flags;
+ int error;
+ boolean_t have_spill = B_FALSE;
+
+ if (!dmu_objset_userused_enabled(dn->dn_objset))
+ return;
+
+ if (before && (flags & (DN_ID_CHKED_BONUS|DN_ID_OLD_EXIST|
+ DN_ID_CHKED_SPILL)))
+ return;
+
+ if (before && dn->dn_bonuslen != 0)
+ data = DN_BONUS(dn->dn_phys);
+ else if (!before && dn->dn_bonuslen != 0) {
+ if (dn->dn_bonus) {
+ db = dn->dn_bonus;
+ mutex_enter(&db->db_mtx);
+ data = dmu_objset_userquota_find_data(db, tx);
+ } else {
+ data = DN_BONUS(dn->dn_phys);
+ }
+ } else if (dn->dn_bonuslen == 0 && dn->dn_bonustype == DMU_OT_SA) {
+ int rf = 0;
+
+ if (RW_WRITE_HELD(&dn->dn_struct_rwlock))
+ rf |= DB_RF_HAVESTRUCT;
+ error = dmu_spill_hold_by_dnode(dn,
+ rf | DB_RF_MUST_SUCCEED,
+ FTAG, (dmu_buf_t **)&db);
+ ASSERT(error == 0);
+ mutex_enter(&db->db_mtx);
+ data = (before) ? db->db.db_data :
+ dmu_objset_userquota_find_data(db, tx);
+ have_spill = B_TRUE;
+ } else {
+ mutex_enter(&dn->dn_mtx);
+ dn->dn_id_flags |= DN_ID_CHKED_BONUS;
+ mutex_exit(&dn->dn_mtx);
+ return;
+ }
+
+ if (before) {
+ ASSERT(data);
+ user = &dn->dn_olduid;
+ group = &dn->dn_oldgid;
+ } else if (data) {
+ user = &dn->dn_newuid;
+ group = &dn->dn_newgid;
+ }
+
+ /*
+ * Must always call the callback in case the object
+ * type has changed and that type isn't an object type to track
+ */
+ error = used_cbs[os->os_phys->os_type](dn->dn_bonustype, data,
+ user, group);
+
+ /*
+ * Preserve existing uid/gid when the callback can't determine
+ * what the new uid/gid are and the callback returned EEXIST.
+ * The EEXIST error tells us to just use the existing uid/gid.
+ * If we don't know what the old values are then just assign
+ * them to 0, since that is a new file being created.
+ */
+ if (!before && data == NULL && error == EEXIST) {
+ if (flags & DN_ID_OLD_EXIST) {
+ dn->dn_newuid = dn->dn_olduid;
+ dn->dn_newgid = dn->dn_oldgid;
+ } else {
+ dn->dn_newuid = 0;
+ dn->dn_newgid = 0;
+ }
+ error = 0;
+ }
+
+ if (db)
+ mutex_exit(&db->db_mtx);
+
+ mutex_enter(&dn->dn_mtx);
+ if (error == 0 && before)
+ dn->dn_id_flags |= DN_ID_OLD_EXIST;
+ if (error == 0 && !before)
+ dn->dn_id_flags |= DN_ID_NEW_EXIST;
+
+ if (have_spill) {
+ dn->dn_id_flags |= DN_ID_CHKED_SPILL;
+ } else {
+ dn->dn_id_flags |= DN_ID_CHKED_BONUS;
+ }
+ mutex_exit(&dn->dn_mtx);
+ if (have_spill)
+ dmu_buf_rele((dmu_buf_t *)db, FTAG);
+}
+
+boolean_t
+dmu_objset_userspace_present(objset_t *os)
+{
+ return (os->os_phys->os_flags &
+ OBJSET_FLAG_USERACCOUNTING_COMPLETE);
+}
+
+int
+dmu_objset_userspace_upgrade(objset_t *os)
+{
+ uint64_t obj;
+ int err = 0;
+
+ if (dmu_objset_userspace_present(os))
+ return (0);
+ if (!dmu_objset_userused_enabled(os))
+ return (ENOTSUP);
+ if (dmu_objset_is_snapshot(os))
+ return (EINVAL);
+
+ /*
+ * We simply need to mark every object dirty, so that it will be
+ * synced out and now accounted. If this is called
+ * concurrently, or if we already did some work before crashing,
+ * that's fine, since we track each object's accounted state
+ * independently.
+ */
+
+ for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) {
+ dmu_tx_t *tx;
+ dmu_buf_t *db;
+ int objerr;
+
+ if (issig(JUSTLOOKING) && issig(FORREAL))
+ return (EINTR);
+
+ objerr = dmu_bonus_hold(os, obj, FTAG, &db);
+ if (objerr)
+ continue;
+ tx = dmu_tx_create(os);
+ dmu_tx_hold_bonus(tx, obj);
+ objerr = dmu_tx_assign(tx, TXG_WAIT);
+ if (objerr) {
+ dmu_tx_abort(tx);
+ continue;
+ }
+ dmu_buf_will_dirty(db, tx);
+ dmu_buf_rele(db, FTAG);
+ dmu_tx_commit(tx);
+ }
+
+ os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE;
+ txg_wait_synced(dmu_objset_pool(os), 0);
+ return (0);
+}
+
+void
+dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp,
+ uint64_t *usedobjsp, uint64_t *availobjsp)
+{
+ dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp,
+ usedobjsp, availobjsp);
+}
+
+uint64_t
+dmu_objset_fsid_guid(objset_t *os)
+{
+ return (dsl_dataset_fsid_guid(os->os_dsl_dataset));
+}
+
+void
+dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat)
+{
+ stat->dds_type = os->os_phys->os_type;
+ if (os->os_dsl_dataset)
+ dsl_dataset_fast_stat(os->os_dsl_dataset, stat);
+}
+
+void
+dmu_objset_stats(objset_t *os, nvlist_t *nv)
+{
+ ASSERT(os->os_dsl_dataset ||
+ os->os_phys->os_type == DMU_OST_META);
+
+ if (os->os_dsl_dataset != NULL)
+ dsl_dataset_stats(os->os_dsl_dataset, nv);
+
+ dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE,
+ os->os_phys->os_type);
+ dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING,
+ dmu_objset_userspace_present(os));
+}
+
+int
+dmu_objset_is_snapshot(objset_t *os)
+{
+ if (os->os_dsl_dataset != NULL)
+ return (dsl_dataset_is_snapshot(os->os_dsl_dataset));
+ else
+ return (B_FALSE);
+}
+
+int
+dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen,
+ boolean_t *conflict)
+{
+ dsl_dataset_t *ds = os->os_dsl_dataset;
+ uint64_t ignored;
+
+ if (ds->ds_phys->ds_snapnames_zapobj == 0)
+ return (ENOENT);
+
+ return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset,
+ ds->ds_phys->ds_snapnames_zapobj, name, 8, 1, &ignored, MT_FIRST,
+ real, maxlen, conflict));
+}
+
+int
+dmu_snapshot_list_next(objset_t *os, int namelen, char *name,
+ uint64_t *idp, uint64_t *offp, boolean_t *case_conflict)
+{
+ dsl_dataset_t *ds = os->os_dsl_dataset;
+ zap_cursor_t cursor;
+ zap_attribute_t attr;
+
+ if (ds->ds_phys->ds_snapnames_zapobj == 0)
+ return (ENOENT);
+
+ zap_cursor_init_serialized(&cursor,
+ ds->ds_dir->dd_pool->dp_meta_objset,
+ ds->ds_phys->ds_snapnames_zapobj, *offp);
+
+ if (zap_cursor_retrieve(&cursor, &attr) != 0) {
+ zap_cursor_fini(&cursor);
+ return (ENOENT);
+ }
+
+ if (strlen(attr.za_name) + 1 > namelen) {
+ zap_cursor_fini(&cursor);
+ return (ENAMETOOLONG);
+ }
+
+ (void) strcpy(name, attr.za_name);
+ if (idp)
+ *idp = attr.za_first_integer;
+ if (case_conflict)
+ *case_conflict = attr.za_normalization_conflict;
+ zap_cursor_advance(&cursor);
+ *offp = zap_cursor_serialize(&cursor);
+ zap_cursor_fini(&cursor);
+
+ return (0);
+}
+
+int
+dmu_dir_list_next(objset_t *os, int namelen, char *name,
+ uint64_t *idp, uint64_t *offp)
+{
+ dsl_dir_t *dd = os->os_dsl_dataset->ds_dir;
+ zap_cursor_t cursor;
+ zap_attribute_t attr;
+
+ /* there is no next dir on a snapshot! */
+ if (os->os_dsl_dataset->ds_object !=
+ dd->dd_phys->dd_head_dataset_obj)
+ return (ENOENT);
+
+ zap_cursor_init_serialized(&cursor,
+ dd->dd_pool->dp_meta_objset,
+ dd->dd_phys->dd_child_dir_zapobj, *offp);
+
+ if (zap_cursor_retrieve(&cursor, &attr) != 0) {
+ zap_cursor_fini(&cursor);
+ return (ENOENT);
+ }
+
+ if (strlen(attr.za_name) + 1 > namelen) {
+ zap_cursor_fini(&cursor);
+ return (ENAMETOOLONG);
+ }
+
+ (void) strcpy(name, attr.za_name);
+ if (idp)
+ *idp = attr.za_first_integer;
+ zap_cursor_advance(&cursor);
+ *offp = zap_cursor_serialize(&cursor);
+ zap_cursor_fini(&cursor);
+
+ return (0);
+}
+
+struct findarg {
+ int (*func)(const char *, void *);
+ void *arg;
+};
+
+/* ARGSUSED */
+static int
+findfunc(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg)
+{
+ struct findarg *fa = arg;
+ return (fa->func(dsname, fa->arg));
+}
+
+/*
+ * Find all objsets under name, and for each, call 'func(child_name, arg)'.
+ * Perhaps change all callers to use dmu_objset_find_spa()?
+ */
+int
+dmu_objset_find(char *name, int func(const char *, void *), void *arg,
+ int flags)
+{
+ struct findarg fa;
+ fa.func = func;
+ fa.arg = arg;
+ return (dmu_objset_find_spa(NULL, name, findfunc, &fa, flags));
+}
+
+/*
+ * Find all objsets under name, call func on each
+ */
+int
+dmu_objset_find_spa(spa_t *spa, const char *name,
+ int func(spa_t *, uint64_t, const char *, void *), void *arg, int flags)
+{
+ dsl_dir_t *dd;
+ dsl_pool_t *dp;
+ dsl_dataset_t *ds;
+ zap_cursor_t zc;
+ zap_attribute_t *attr;
+ char *child;
+ uint64_t thisobj;
+ int err;
+
+ if (name == NULL)
+ name = spa_name(spa);
+ err = dsl_dir_open_spa(spa, name, FTAG, &dd, NULL);
+ if (err)
+ return (err);
+
+ /* Don't visit hidden ($MOS & $ORIGIN) objsets. */
+ if (dd->dd_myname[0] == '$') {
+ dsl_dir_close(dd, FTAG);
+ return (0);
+ }
+
+ thisobj = dd->dd_phys->dd_head_dataset_obj;
+ attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
+ dp = dd->dd_pool;
+
+ /*
+ * Iterate over all children.
+ */
+ if (flags & DS_FIND_CHILDREN) {
+ for (zap_cursor_init(&zc, dp->dp_meta_objset,
+ dd->dd_phys->dd_child_dir_zapobj);
+ zap_cursor_retrieve(&zc, attr) == 0;
+ (void) zap_cursor_advance(&zc)) {
+ ASSERT(attr->za_integer_length == sizeof (uint64_t));
+ ASSERT(attr->za_num_integers == 1);
+
+ child = kmem_asprintf("%s/%s", name, attr->za_name);
+ err = dmu_objset_find_spa(spa, child, func, arg, flags);
+ strfree(child);
+ if (err)
+ break;
+ }
+ zap_cursor_fini(&zc);
+
+ if (err) {
+ dsl_dir_close(dd, FTAG);
+ kmem_free(attr, sizeof (zap_attribute_t));
+ return (err);
+ }
+ }
+
+ /*
+ * Iterate over all snapshots.
+ */
+ if (flags & DS_FIND_SNAPSHOTS) {
+ if (!dsl_pool_sync_context(dp))
+ rw_enter(&dp->dp_config_rwlock, RW_READER);
+ err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
+ if (!dsl_pool_sync_context(dp))
+ rw_exit(&dp->dp_config_rwlock);
+
+ if (err == 0) {
+ uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj;
+ dsl_dataset_rele(ds, FTAG);
+
+ for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj);
+ zap_cursor_retrieve(&zc, attr) == 0;
+ (void) zap_cursor_advance(&zc)) {
+ ASSERT(attr->za_integer_length ==
+ sizeof (uint64_t));
+ ASSERT(attr->za_num_integers == 1);
+
+ child = kmem_asprintf("%s@%s",
+ name, attr->za_name);
+ err = func(spa, attr->za_first_integer,
+ child, arg);
+ strfree(child);
+ if (err)
+ break;
+ }
+ zap_cursor_fini(&zc);
+ }
+ }
+
+ dsl_dir_close(dd, FTAG);
+ kmem_free(attr, sizeof (zap_attribute_t));
+
+ if (err)
+ return (err);
+
+ /*
+ * Apply to self if appropriate.
+ */
+ err = func(spa, thisobj, name, arg);
+ return (err);
+}
+
+/* ARGSUSED */
+int
+dmu_objset_prefetch(const char *name, void *arg)
+{
+ dsl_dataset_t *ds;
+
+ if (dsl_dataset_hold(name, FTAG, &ds))
+ return (0);
+
+ if (!BP_IS_HOLE(&ds->ds_phys->ds_bp)) {
+ mutex_enter(&ds->ds_opening_lock);
+ if (ds->ds_objset == NULL) {
+ uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH;
+ zbookmark_t zb;
+
+ SET_BOOKMARK(&zb, ds->ds_object, ZB_ROOT_OBJECT,
+ ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
+
+ (void) dsl_read_nolock(NULL, dsl_dataset_get_spa(ds),
+ &ds->ds_phys->ds_bp, NULL, NULL,
+ ZIO_PRIORITY_ASYNC_READ,
+ ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE,
+ &aflags, &zb);
+ }
+ mutex_exit(&ds->ds_opening_lock);
+ }
+
+ dsl_dataset_rele(ds, FTAG);
+ return (0);
+}
+
+void
+dmu_objset_set_user(objset_t *os, void *user_ptr)
+{
+ ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
+ os->os_user_ptr = user_ptr;
+}
+
+void *
+dmu_objset_get_user(objset_t *os)
+{
+ ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
+ return (os->os_user_ptr);
+}