FITS: generating send-streams in portable format
This commit adds the command 'zfs fits-send', analogous to zfs send. The
generated send stream is compatible with the stream generated with that
from 'btrfs send' and can in principle easily be received to any filesystem.

@@ -200,10 +200,11 @@
 int dsl_dataset_own(const char *name, boolean_t inconsistentok,
     void *tag, dsl_dataset_t **dsp);
 int dsl_dataset_own_obj(struct dsl_pool *dp, uint64_t dsobj,
     boolean_t inconsistentok, void *tag, dsl_dataset_t **dsp);
 void dsl_dataset_name(dsl_dataset_t *ds, char *name);
+int dsl_dataset_namelen(dsl_dataset_t *ds);
 void dsl_dataset_rele(dsl_dataset_t *ds, void *tag);
 void dsl_dataset_disown(dsl_dataset_t *ds, void *tag);
 void dsl_dataset_drop_ref(dsl_dataset_t *ds, void *tag);
 boolean_t dsl_dataset_tryown(dsl_dataset_t *ds, boolean_t inconsistentok,
     void *tag);