53  * to the dp_config_rwlock -- the lock will always be held when the callbacks
  54  * are called.  It will be held for read during the open-context (preliminary)
  55  * call to the checkfunc, and then held for write from syncing context during
  56  * the calls to the check and sync funcs.
  57  *
  58  * A dataset or pool name can be passed as the first argument.  Typically,
  59  * the check func will hold, check the return value of the hold, and then
  60  * release the dataset.  The sync func will VERIFYO(hold()) the dataset.
  61  * This is safe because no changes can be made between the check and sync funcs,
  62  * and the sync func will only be called if the check func successfully opened
  63  * the dataset.
  64  */
  65 int
  66 dsl_sync_task(const char *pool, dsl_checkfunc_t *checkfunc,
  67     dsl_syncfunc_t *syncfunc, void *arg,
  68     int blocks_modified, zfs_space_check_t space_check)
  69 {
  70         spa_t *spa;
  71         dmu_tx_t *tx;
  72         int err;
  73         dsl_sync_task_t dst = { 0 };
  74         dsl_pool_t *dp;
  75 
  76         err = spa_open(pool, &spa, FTAG);
  77         if (err != 0)
  78                 return (err);
  79         dp = spa_get_dsl(spa);
  80 
  81 top:
  82         tx = dmu_tx_create_dd(dp->dp_mos_dir);
  83         VERIFY0(dmu_tx_assign(tx, TXG_WAIT));
  84 
  85         dst.dst_pool = dp;
  86         dst.dst_txg = dmu_tx_get_txg(tx);
  87         dst.dst_space = blocks_modified << DST_AVG_BLKSHIFT;
  88         dst.dst_space_check = space_check;
  89         dst.dst_checkfunc = checkfunc != NULL ? checkfunc : dsl_null_checkfunc;
  90         dst.dst_syncfunc = syncfunc;
  91         dst.dst_arg = arg;
  92         dst.dst_error = 0;
  93         dst.dst_nowaiter = B_FALSE;

  53  * to the dp_config_rwlock -- the lock will always be held when the callbacks
  54  * are called.  It will be held for read during the open-context (preliminary)
  55  * call to the checkfunc, and then held for write from syncing context during
  56  * the calls to the check and sync funcs.
  57  *
  58  * A dataset or pool name can be passed as the first argument.  Typically,
  59  * the check func will hold, check the return value of the hold, and then
  60  * release the dataset.  The sync func will VERIFYO(hold()) the dataset.
  61  * This is safe because no changes can be made between the check and sync funcs,
  62  * and the sync func will only be called if the check func successfully opened
  63  * the dataset.
  64  */
  65 int
  66 dsl_sync_task(const char *pool, dsl_checkfunc_t *checkfunc,
  67     dsl_syncfunc_t *syncfunc, void *arg,
  68     int blocks_modified, zfs_space_check_t space_check)
  69 {
  70         spa_t *spa;
  71         dmu_tx_t *tx;
  72         int err;
  73         dsl_sync_task_t dst = { .dst_error = 0 };
  74         dsl_pool_t *dp;
  75 
  76         err = spa_open(pool, &spa, FTAG);
  77         if (err != 0)
  78                 return (err);
  79         dp = spa_get_dsl(spa);
  80 
  81 top:
  82         tx = dmu_tx_create_dd(dp->dp_mos_dir);
  83         VERIFY0(dmu_tx_assign(tx, TXG_WAIT));
  84 
  85         dst.dst_pool = dp;
  86         dst.dst_txg = dmu_tx_get_txg(tx);
  87         dst.dst_space = blocks_modified << DST_AVG_BLKSHIFT;
  88         dst.dst_space_check = space_check;
  89         dst.dst_checkfunc = checkfunc != NULL ? checkfunc : dsl_null_checkfunc;
  90         dst.dst_syncfunc = syncfunc;
  91         dst.dst_arg = arg;
  92         dst.dst_error = 0;
  93         dst.dst_nowaiter = B_FALSE;