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dmu_objset.c

/*
 * 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 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#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/zio_checksum.h>
#include <sys/zap.h>
#include <sys/zil.h>
#include <sys/dmu_impl.h>
#include <sys/zfs_ioctl.h>

spa_t *
dmu_objset_spa(objset_t *os)
{
      return (os->os->os_spa);
}

zilog_t *
dmu_objset_zil(objset_t *os)
{
      return (os->os->os_zil);
}

dsl_pool_t *
dmu_objset_pool(objset_t *os)
{
      dsl_dataset_t *ds;

      if ((ds = os->os->os_dsl_dataset) != NULL && ds->ds_dir)
            return (ds->ds_dir->dd_pool);
      else
            return (spa_get_dsl(os->os->os_spa));
}

dsl_dataset_t *
dmu_objset_ds(objset_t *os)
{
      return (os->os->os_dsl_dataset);
}

dmu_objset_type_t
dmu_objset_type(objset_t *os)
{
      return (os->os->os_phys->os_type);
}

void
dmu_objset_name(objset_t *os, char *buf)
{
      dsl_dataset_name(os->os->os_dsl_dataset, buf);
}

uint64_t
dmu_objset_id(objset_t *os)
{
      dsl_dataset_t *ds = os->os->os_dsl_dataset;

      return (ds ? ds->ds_object : 0);
}

static void
checksum_changed_cb(void *arg, uint64_t newval)
{
      objset_impl_t *osi = arg;

      /*
       * Inheritance should have been done by now.
       */
      ASSERT(newval != ZIO_CHECKSUM_INHERIT);

      osi->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE);
}

static void
compression_changed_cb(void *arg, uint64_t newval)
{
      objset_impl_t *osi = arg;

      /*
       * Inheritance and range checking should have been done by now.
       */
      ASSERT(newval != ZIO_COMPRESS_INHERIT);

      osi->os_compress = zio_compress_select(newval, ZIO_COMPRESS_ON_VALUE);
}

static void
copies_changed_cb(void *arg, uint64_t newval)
{
      objset_impl_t *osi = arg;

      /*
       * Inheritance and range checking should have been done by now.
       */
      ASSERT(newval > 0);
      ASSERT(newval <= spa_max_replication(osi->os_spa));

      osi->os_copies = newval;
}

static void
primary_cache_changed_cb(void *arg, uint64_t newval)
{
      objset_impl_t *osi = arg;

      /*
       * Inheritance and range checking should have been done by now.
       */
      ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
          newval == ZFS_CACHE_METADATA);

      osi->os_primary_cache = newval;
}

static void
secondary_cache_changed_cb(void *arg, uint64_t newval)
{
      objset_impl_t *osi = arg;

      /*
       * Inheritance and range checking should have been done by now.
       */
      ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
          newval == ZFS_CACHE_METADATA);

      osi->os_secondary_cache = newval;
}

void
dmu_objset_byteswap(void *buf, size_t size)
{
      objset_phys_t *osp = buf;

      ASSERT(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);
}

int
dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
    objset_impl_t **osip)
{
      objset_impl_t *osi;
      int i, err;

      ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock));

      osi = kmem_zalloc(sizeof (objset_impl_t), KM_SLEEP);
      osi->os.os = osi;
      osi->os_dsl_dataset = ds;
      osi->os_spa = spa;
      osi->os_rootbp = bp;
      if (!BP_IS_HOLE(osi->os_rootbp)) {
            uint32_t aflags = ARC_WAIT;
            zbookmark_t zb;
            zb.zb_objset = ds ? ds->ds_object : 0;
            zb.zb_object = 0;
            zb.zb_level = -1;
            zb.zb_blkid = 0;
            if (DMU_OS_IS_L2CACHEABLE(osi))
                  aflags |= ARC_L2CACHE;

            dprintf_bp(osi->os_rootbp, "reading %s", "");
            /*
             * NB: 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 = arc_read_nolock(NULL, spa, osi->os_rootbp,
                arc_getbuf_func, &osi->os_phys_buf,
                ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb);
            if (err) {
                  kmem_free(osi, sizeof (objset_impl_t));
                  /* convert checksum errors into IO errors */
                  if (err == ECKSUM)
                        err = EIO;
                  return (err);
            }
            osi->os_phys = osi->os_phys_buf->b_data;
      } else {
            osi->os_phys_buf = arc_buf_alloc(spa, sizeof (objset_phys_t),
                &osi->os_phys_buf, ARC_BUFC_METADATA);
            osi->os_phys = osi->os_phys_buf->b_data;
            bzero(osi->os_phys, sizeof (objset_phys_t));
      }

      /*
       * 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, osi);
            if (err == 0)
                  err = dsl_prop_register(ds, "secondarycache",
                      secondary_cache_changed_cb, osi);
            if (!dsl_dataset_is_snapshot(ds)) {
                  if (err == 0)
                        err = dsl_prop_register(ds, "checksum",
                            checksum_changed_cb, osi);
                  if (err == 0)
                        err = dsl_prop_register(ds, "compression",
                            compression_changed_cb, osi);
                  if (err == 0)
                        err = dsl_prop_register(ds, "copies",
                            copies_changed_cb, osi);
            }
            if (err) {
                  VERIFY(arc_buf_remove_ref(osi->os_phys_buf,
                      &osi->os_phys_buf) == 1);
                  kmem_free(osi, sizeof (objset_impl_t));
                  return (err);
            }
      } else if (ds == NULL) {
            /* It's the meta-objset. */
            osi->os_checksum = ZIO_CHECKSUM_FLETCHER_4;
            osi->os_compress = ZIO_COMPRESS_LZJB;
            osi->os_copies = spa_max_replication(spa);
            osi->os_primary_cache = ZFS_CACHE_ALL;
            osi->os_secondary_cache = ZFS_CACHE_ALL;
      }

      osi->os_zil_header = osi->os_phys->os_zil_header;
      osi->os_zil = zil_alloc(&osi->os, &osi->os_zil_header);

      for (i = 0; i < TXG_SIZE; i++) {
            list_create(&osi->os_dirty_dnodes[i], sizeof (dnode_t),
                offsetof(dnode_t, dn_dirty_link[i]));
            list_create(&osi->os_free_dnodes[i], sizeof (dnode_t),
                offsetof(dnode_t, dn_dirty_link[i]));
      }
      list_create(&osi->os_dnodes, sizeof (dnode_t),
          offsetof(dnode_t, dn_link));
      list_create(&osi->os_downgraded_dbufs, sizeof (dmu_buf_impl_t),
          offsetof(dmu_buf_impl_t, db_link));

      mutex_init(&osi->os_lock, NULL, MUTEX_DEFAULT, NULL);
      mutex_init(&osi->os_obj_lock, NULL, MUTEX_DEFAULT, NULL);
      mutex_init(&osi->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL);

      osi->os_meta_dnode = dnode_special_open(osi,
          &osi->os_phys->os_meta_dnode, DMU_META_DNODE_OBJECT);

      /*
       * We should be the only thread trying to do this because we
       * have ds_opening_lock
       */
      if (ds) {
            VERIFY(NULL == dsl_dataset_set_user_ptr(ds, osi,
                dmu_objset_evict));
      }

      *osip = osi;
      return (0);
}

static int
dmu_objset_open_ds_os(dsl_dataset_t *ds, objset_t *os, dmu_objset_type_t type)
{
      objset_impl_t *osi;

      mutex_enter(&ds->ds_opening_lock);
      osi = dsl_dataset_get_user_ptr(ds);
      if (osi == NULL) {
            int err;

            err = dmu_objset_open_impl(dsl_dataset_get_spa(ds),
                ds, &ds->ds_phys->ds_bp, &osi);
            if (err) {
                  mutex_exit(&ds->ds_opening_lock);
                  return (err);
            }
      }
      mutex_exit(&ds->ds_opening_lock);

      os->os = osi;
      os->os_mode = DS_MODE_NOHOLD;

      if (type != DMU_OST_ANY && type != os->os->os_phys->os_type)
            return (EINVAL);
      return (0);
}

int
dmu_objset_open_ds(dsl_dataset_t *ds, dmu_objset_type_t type, objset_t **osp)
{
      objset_t *os;
      int err;

      os = kmem_alloc(sizeof (objset_t), KM_SLEEP);
      err = dmu_objset_open_ds_os(ds, os, type);
      if (err)
            kmem_free(os, sizeof (objset_t));
      else
            *osp = os;
      return (err);
}

/* called from zpl */
int
dmu_objset_open(const char *name, dmu_objset_type_t type, int mode,
    objset_t **osp)
{
      objset_t *os;
      dsl_dataset_t *ds;
      int err;

      ASSERT(DS_MODE_TYPE(mode) == DS_MODE_USER ||
          DS_MODE_TYPE(mode) == DS_MODE_OWNER);

      os = kmem_alloc(sizeof (objset_t), KM_SLEEP);
      if (DS_MODE_TYPE(mode) == DS_MODE_USER)
            err = dsl_dataset_hold(name, os, &ds);
      else
            err = dsl_dataset_own(name, mode, os, &ds);
      if (err) {
            kmem_free(os, sizeof (objset_t));
            return (err);
      }

      err = dmu_objset_open_ds_os(ds, os, type);
      if (err) {
            if (DS_MODE_TYPE(mode) == DS_MODE_USER)
                  dsl_dataset_rele(ds, os);
            else
                  dsl_dataset_disown(ds, os);
            kmem_free(os, sizeof (objset_t));
      } else {
            os->os_mode = mode;
            *osp = os;
      }
      return (err);
}

void
dmu_objset_close(objset_t *os)
{
      ASSERT(DS_MODE_TYPE(os->os_mode) == DS_MODE_USER ||
          DS_MODE_TYPE(os->os_mode) == DS_MODE_OWNER ||
          DS_MODE_TYPE(os->os_mode) == DS_MODE_NOHOLD);

      if (DS_MODE_TYPE(os->os_mode) == DS_MODE_USER)
            dsl_dataset_rele(os->os->os_dsl_dataset, os);
      else if (DS_MODE_TYPE(os->os_mode) == DS_MODE_OWNER)
            dsl_dataset_disown(os->os->os_dsl_dataset, os);
      kmem_free(os, sizeof (objset_t));
}

int
dmu_objset_evict_dbufs(objset_t *os)
{
      objset_impl_t *osi = os->os;
      dnode_t *dn;

      mutex_enter(&osi->os_lock);

      /* process the mdn last, since the other dnodes have holds on it */
      list_remove(&osi->os_dnodes, osi->os_meta_dnode);
      list_insert_tail(&osi->os_dnodes, osi->os_meta_dnode);

      /*
       * 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(&osi->os_dnodes);
          dn && !dnode_add_ref(dn, FTAG);
          dn = list_next(&osi->os_dnodes, dn))
            continue;

      while (dn) {
            dnode_t *next_dn = dn;

            do {
                  next_dn = list_next(&osi->os_dnodes, next_dn);
            } while (next_dn && !dnode_add_ref(next_dn, FTAG));

            mutex_exit(&osi->os_lock);
            dnode_evict_dbufs(dn);
            dnode_rele(dn, FTAG);
            mutex_enter(&osi->os_lock);
            dn = next_dn;
      }
      mutex_exit(&osi->os_lock);
      return (list_head(&osi->os_dnodes) != osi->os_meta_dnode);
}

void
dmu_objset_evict(dsl_dataset_t *ds, void *arg)
{
      objset_impl_t *osi = arg;
      objset_t os;
      int i;

      for (i = 0; i < TXG_SIZE; i++) {
            ASSERT(list_head(&osi->os_dirty_dnodes[i]) == NULL);
            ASSERT(list_head(&osi->os_free_dnodes[i]) == NULL);
      }

      if (ds) {
            if (!dsl_dataset_is_snapshot(ds)) {
                  VERIFY(0 == dsl_prop_unregister(ds, "checksum",
                      checksum_changed_cb, osi));
                  VERIFY(0 == dsl_prop_unregister(ds, "compression",
                      compression_changed_cb, osi));
                  VERIFY(0 == dsl_prop_unregister(ds, "copies",
                      copies_changed_cb, osi));
            }
            VERIFY(0 == dsl_prop_unregister(ds, "primarycache",
                primary_cache_changed_cb, osi));
            VERIFY(0 == dsl_prop_unregister(ds, "secondarycache",
                secondary_cache_changed_cb, osi));
      }

      /*
       * We should need only a single pass over the dnode list, since
       * nothing can be added to the list at this point.
       */
      os.os = osi;
      (void) dmu_objset_evict_dbufs(&os);

      ASSERT3P(list_head(&osi->os_dnodes), ==, osi->os_meta_dnode);
      ASSERT3P(list_tail(&osi->os_dnodes), ==, osi->os_meta_dnode);
      ASSERT3P(list_head(&osi->os_meta_dnode->dn_dbufs), ==, NULL);

      dnode_special_close(osi->os_meta_dnode);
      zil_free(osi->os_zil);

      VERIFY(arc_buf_remove_ref(osi->os_phys_buf, &osi->os_phys_buf) == 1);
      mutex_destroy(&osi->os_lock);
      mutex_destroy(&osi->os_obj_lock);
      mutex_destroy(&osi->os_user_ptr_lock);
      kmem_free(osi, sizeof (objset_impl_t));
}

/* called from dsl for meta-objset */
objset_impl_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_impl_t *osi;
      dnode_t *mdn;

      ASSERT(dmu_tx_is_syncing(tx));
      if (ds)
            mutex_enter(&ds->ds_opening_lock);
      VERIFY(0 == dmu_objset_open_impl(spa, ds, bp, &osi));
      if (ds)
            mutex_exit(&ds->ds_opening_lock);
      mdn = osi->os_meta_dnode;

      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);
      osi->os_phys->os_type = type;

      dsl_dataset_dirty(ds, tx);

      return (osi);
}

struct oscarg {
      void (*userfunc)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx);
      void *userarg;
      dsl_dataset_t *clone_parent;
      const char *lastname;
      dmu_objset_type_t type;
      uint64_t flags;
};

/*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_parent != NULL) {
            /*
             * You can't clone across pools.
             */
            if (oa->clone_parent->ds_dir->dd_pool != dd->dd_pool)
                  return (EXDEV);

            /*
             * You can only clone snapshots, not the head datasets.
             */
            if (oa->clone_parent->ds_phys->ds_num_children == 0)
                  return (EINVAL);
      }

      return (0);
}

static void
dmu_objset_create_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx)
{
      dsl_dir_t *dd = arg1;
      struct oscarg *oa = arg2;
      dsl_dataset_t *ds;
      blkptr_t *bp;
      uint64_t dsobj;

      ASSERT(dmu_tx_is_syncing(tx));

      dsobj = dsl_dataset_create_sync(dd, oa->lastname,
          oa->clone_parent, oa->flags, cr, tx);

      VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool, dsobj, FTAG, &ds));
      bp = dsl_dataset_get_blkptr(ds);
      if (BP_IS_HOLE(bp)) {
            objset_impl_t *osi;

            /* This is an empty dmu_objset; not a clone. */
            osi = dmu_objset_create_impl(dsl_dataset_get_spa(ds),
                ds, bp, oa->type, tx);

            if (oa->userfunc)
                  oa->userfunc(&osi->os, oa->userarg, cr, tx);
      }

      spa_history_internal_log(LOG_DS_CREATE, dd->dd_pool->dp_spa,
          tx, cr, "dataset = %llu", dsobj);

      dsl_dataset_rele(ds, FTAG);
}

int
dmu_objset_create(const char *name, dmu_objset_type_t type,
    objset_t *clone_parent, 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);
      }

      dprintf("name=%s\n", name);

      oa.userfunc = func;
      oa.userarg = arg;
      oa.lastname = tail;
      oa.type = type;
      oa.flags = flags;

      if (clone_parent != NULL) {
            /*
             * You can't clone to a different type.
             */
            if (clone_parent->os->os_phys->os_type != type) {
                  dsl_dir_close(pdd, FTAG);
                  return (EINVAL);
            }
            oa.clone_parent = clone_parent->os->os_dsl_dataset;
      }
      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)
{
      objset_t *os;
      int error;

      /*
       * If it looks like we'll be able to destroy it, and there's
       * an unplayed replay log sitting around, destroy the log.
       * It would be nicer to do this in dsl_dataset_destroy_sync(),
       * but the replay log objset is modified in open context.
       */
      error = dmu_objset_open(name, DMU_OST_ANY,
          DS_MODE_OWNER|DS_MODE_READONLY|DS_MODE_INCONSISTENT, &os);
      if (error == 0) {
            dsl_dataset_t *ds = os->os->os_dsl_dataset;
            zil_destroy(dmu_objset_zil(os), B_FALSE);

            error = dsl_dataset_destroy(ds, os);
            /*
             * dsl_dataset_destroy() closes the ds.
             */
            kmem_free(os, sizeof (objset_t));
      }

      return (error);
}

/*
 * This will close the objset.
 */
int
dmu_objset_rollback(objset_t *os)
{
      int err;
      dsl_dataset_t *ds;

      ds = os->os->os_dsl_dataset;

      if (!dsl_dataset_tryown(ds, TRUE, os)) {
            dmu_objset_close(os);
            return (EBUSY);
      }

      err = dsl_dataset_rollback(ds, os->os->os_phys->os_type);

      /*
       * NB: we close the objset manually because the rollback
       * actually implicitly called dmu_objset_evict(), thus freeing
       * the objset_impl_t.
       */
      dsl_dataset_disown(ds, os);
      kmem_free(os, sizeof (objset_t));
      return (err);
}

struct snaparg {
      dsl_sync_task_group_t *dstg;
      char *snapname;
      char failed[MAXPATHLEN];
      boolean_t checkperms;
      list_t objsets;
};

struct osnode {
      list_node_t node;
      objset_t *os;
};

static int
dmu_objset_snapshot_one(char *name, void *arg)
{
      struct snaparg *sn = arg;
      objset_t *os;
      int err;

      (void) strcpy(sn->failed, name);

      /*
       * Check permissions only when requested.  This only applies when
       * doing a recursive snapshot.  The permission checks for the starting
       * dataset have already been performed in zfs_secpolicy_snapshot()
       */
      if (sn->checkperms == B_TRUE &&
          (err = zfs_secpolicy_snapshot_perms(name, CRED())))
            return (err);

      err = dmu_objset_open(name, DMU_OST_ANY, DS_MODE_USER, &os);
      if (err != 0)
            return (err);

      /* If the objset is in an inconsistent state, return busy */
      if (os->os->os_dsl_dataset->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) {
            dmu_objset_close(os);
            return (EBUSY);
      }

      /*
       * NB: we need to wait for all in-flight changes to get to disk,
       * so that we snapshot those changes.  zil_suspend does this as
       * a side effect.
       */
      err = zil_suspend(dmu_objset_zil(os));
      if (err == 0) {
            struct osnode *osn;
            dsl_sync_task_create(sn->dstg, dsl_dataset_snapshot_check,
                dsl_dataset_snapshot_sync, os->os->os_dsl_dataset,
                sn->snapname, 3);
            osn = kmem_alloc(sizeof (struct osnode), KM_SLEEP);
            osn->os = os;
            list_insert_tail(&sn->objsets, osn);
      } else {
            dmu_objset_close(os);
      }

      return (err);
}

int
dmu_objset_snapshot(char *fsname, char *snapname, boolean_t recursive)
{
      dsl_sync_task_t *dst;
      struct osnode *osn;
      struct snaparg sn = { 0 };
      spa_t *spa;
      int err;

      (void) strcpy(sn.failed, fsname);

      err = spa_open(fsname, &spa, FTAG);
      if (err)
            return (err);

      sn.dstg = dsl_sync_task_group_create(spa_get_dsl(spa));
      sn.snapname = snapname;
      list_create(&sn.objsets, sizeof (struct osnode),
          offsetof(struct osnode, node));

      if (recursive) {
            sn.checkperms = B_TRUE;
            err = dmu_objset_find(fsname,
                dmu_objset_snapshot_one, &sn, DS_FIND_CHILDREN);
      } else {
            sn.checkperms = B_FALSE;
            err = dmu_objset_snapshot_one(fsname, &sn);
      }

      if (err)
            goto out;

      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)) {
            dsl_dataset_t *ds = dst->dst_arg1;
            if (dst->dst_err)
                  dsl_dataset_name(ds, sn.failed);
      }

out:
      while (osn = list_head(&sn.objsets)) {
            list_remove(&sn.objsets, osn);
            zil_resume(dmu_objset_zil(osn->os));
            dmu_objset_close(osn->os);
            kmem_free(osn, sizeof (struct osnode));
      }
      list_destroy(&sn.objsets);

      if (err)
            (void) strcpy(fsname, sn.failed);
      dsl_sync_task_group_destroy(sn.dstg);
      spa_close(spa, FTAG);
      return (err);
}

static void
dmu_objset_sync_dnodes(list_t *list, 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()
             * to accomodate meta-dnode
             */
            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);
            dnode_sync(dn, tx);
      }
}

/* ARGSUSED */
static void
ready(zio_t *zio, arc_buf_t *abuf, void *arg)
{
      blkptr_t *bp = zio->io_bp;
      blkptr_t *bp_orig = &zio->io_bp_orig;
      objset_impl_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.
       */
      bp->blk_fill = 1; /* count the meta-dnode */
      for (int i = 0; i < dnp->dn_nblkptr; i++)
            bp->blk_fill += dnp->dn_blkptr[i].blk_fill;

      if (zio->io_flags & ZIO_FLAG_IO_REWRITE) {
            ASSERT(DVA_EQUAL(BP_IDENTITY(bp), BP_IDENTITY(bp_orig)));
      } else {
            if (zio->io_bp_orig.blk_birth == os->os_synctx->tx_txg)
                  (void) dsl_dataset_block_kill(os->os_dsl_dataset,
                      &zio->io_bp_orig, zio, os->os_synctx);
            dsl_dataset_block_born(os->os_dsl_dataset, bp, os->os_synctx);
      }
}

/* called from dsl */
void
dmu_objset_sync(objset_impl_t *os, zio_t *pio, dmu_tx_t *tx)
{
      int txgoff;
      zbookmark_t zb;
      writeprops_t wp = { 0 };
      zio_t *zio;
      list_t *list;
      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
       */
      zb.zb_objset = os->os_dsl_dataset ? os->os_dsl_dataset->ds_object : 0;
      zb.zb_object = 0;
      zb.zb_level = -1; /* for block ordering; it's level 0 on disk */
      zb.zb_blkid = 0;

      wp.wp_type = DMU_OT_OBJSET;
      wp.wp_level = 0;  /* on-disk BP level; see above */
      wp.wp_copies = os->os_copies;
      wp.wp_oschecksum = os->os_checksum;
      wp.wp_oscompress = os->os_compress;

      if (BP_IS_OLDER(os->os_rootbp, tx->tx_txg)) {
            (void) dsl_dataset_block_kill(os->os_dsl_dataset,
                os->os_rootbp, pio, tx);
      }

      arc_release(os->os_phys_buf, &os->os_phys_buf);
      zio = arc_write(pio, os->os_spa, &wp, DMU_OS_IS_L2CACHEABLE(os),
          tx->tx_txg, os->os_rootbp, os->os_phys_buf, ready, NULL, os,
          ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb);

      /*
       * Sync meta-dnode - the parent IO for the sync is the root block
       */
      os->os_meta_dnode->dn_zio = zio;
      dnode_sync(os->os_meta_dnode, tx);

      txgoff = tx->tx_txg & TXG_MASK;

      dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], tx);
      dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], tx);

      list = &os->os_meta_dnode->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);
}

void
dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp,
    uint64_t *usedobjsp, uint64_t *availobjsp)
{
      dsl_dataset_space(os->os->os_dsl_dataset, refdbytesp, availbytesp,
          usedobjsp, availobjsp);
}

uint64_t
dmu_objset_fsid_guid(objset_t *os)
{
      return (dsl_dataset_fsid_guid(os->os->os_dsl_dataset));
}

void
dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat)
{
      stat->dds_type = os->os->os_phys->os_type;
      if (os->os->os_dsl_dataset)
            dsl_dataset_fast_stat(os->os->os_dsl_dataset, stat);
}

void
dmu_objset_stats(objset_t *os, nvlist_t *nv)
{
      ASSERT(os->os->os_dsl_dataset ||
          os->os->os_phys->os_type == DMU_OST_META);

      if (os->os->os_dsl_dataset != NULL)
            dsl_dataset_stats(os->os->os_dsl_dataset, nv);

      dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE,
          os->os->os_phys->os_type);
}

int
dmu_objset_is_snapshot(objset_t *os)
{
      if (os->os->os_dsl_dataset != NULL)
            return (dsl_dataset_is_snapshot(os->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->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->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->os_dsl_dataset->ds_dir;
      zap_cursor_t cursor;
      zap_attribute_t attr;

      /* there is no next dir on a snapshot! */
      if (os->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)(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((char *)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(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_alloc(MAXPATHLEN, KM_SLEEP);
                  (void) strcpy(child, name);
                  (void) strcat(child, "/");
                  (void) strcat(child, attr->za_name);
                  err = dmu_objset_find_spa(spa, child, func, arg, flags);
                  kmem_free(child, MAXPATHLEN);
                  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_alloc(MAXPATHLEN, KM_SLEEP);
                        (void) strcpy(child, name);
                        (void) strcat(child, "@");
                        (void) strcat(child, attr->za_name);
                        err = func(spa, attr->za_first_integer,
                            child, arg);
                        kmem_free(child, MAXPATHLEN);
                        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(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 (!dsl_dataset_get_user_ptr(ds)) {
                  uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH;
                  zbookmark_t zb;

                  zb.zb_objset = ds->ds_object;
                  zb.zb_object = 0;
                  zb.zb_level = -1;
                  zb.zb_blkid = 0;

                  (void) arc_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->os_user_ptr_lock));
      os->os->os_user_ptr = user_ptr;
}

void *
dmu_objset_get_user(objset_t *os)
{
      ASSERT(MUTEX_HELD(&os->os->os_user_ptr_lock));
      return (os->os->os_user_ptr);
}

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