OpenZFS 2605, 6980, 6902

2605 want to resume interrupted zfs send
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Paul Dagnelie <pcd@delphix.com>
Reviewed by: Richard Elling <Richard.Elling@RichardElling.com>
Reviewed by: Xin Li <delphij@freebsd.org>
Reviewed by: Arne Jansen <sensille@gmx.net>
Approved by: Dan McDonald <danmcd@omniti.com>
Ported-by: kernelOfTruth <kerneloftruth@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

OpenZFS-issue: https://www.illumos.org/issues/2605
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/9c3fd12

6980 6902 causes zfs send to break due to 32-bit/64-bit struct mismatch
Reviewed by: Paul Dagnelie <pcd@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Ported by: Brian Behlendorf <behlendorf1@llnl.gov>

OpenZFS-issue: https://www.illumos.org/issues/6980
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/ea4a67f

Porting notes:
- All rsend and snapshop tests enabled and updated for Linux.
- Fix misuse of input argument in traverse_visitbp().
- Fix ISO C90 warnings and errors.
- Fix gcc 'missing braces around initializer' in
  'struct send_thread_arg to_arg =' warning.
- Replace 4 argument fletcher_4_native() with 3 argument version,
  this change was made in OpenZFS 4185 which has not been ported.
- Part of the sections for 'zfs receive' and 'zfs send' was
  rewritten and reordered to approximate upstream.
- Fix mktree xattr creation, 'user.' prefix required.
- Minor fixes to newly enabled test cases
- Long holds for volumes allowed during receive for minor registration.

include/sys/dsl_dataset.h

@@ -98,6 +98,18 @@ struct dsl_pool;
  */
 #define	DS_FIELD_LARGE_DNODE "org.zfsonlinux:large_dnode"
 
+/*
+ * These fields are set on datasets that are in the middle of a resumable
+ * receive, and allow the sender to resume the send if it is interrupted.
+ */
+#define	DS_FIELD_RESUME_FROMGUID "com.delphix:resume_fromguid"
+#define	DS_FIELD_RESUME_TONAME "com.delphix:resume_toname"
+#define	DS_FIELD_RESUME_TOGUID "com.delphix:resume_toguid"
+#define	DS_FIELD_RESUME_OBJECT "com.delphix:resume_object"
+#define	DS_FIELD_RESUME_OFFSET "com.delphix:resume_offset"
+#define	DS_FIELD_RESUME_BYTES "com.delphix:resume_bytes"
+#define	DS_FIELD_RESUME_EMBEDOK "com.delphix:resume_embedok"
+
 /*
  * DS_FLAG_CI_DATASET is set if the dataset contains a file system whose
  * name lookups should be performed case-insensitively.
@@ -191,6 +203,14 @@ typedef struct dsl_dataset {
 	kmutex_t ds_sendstream_lock;
 	list_t ds_sendstreams;
 
+	/*
+	 * When in the middle of a resumable receive, tracks how much
+	 * progress we have made.
+	 */
+	uint64_t ds_resume_object[TXG_SIZE];
+	uint64_t ds_resume_offset[TXG_SIZE];
+	uint64_t ds_resume_bytes[TXG_SIZE];
+
 	/* Protected by our dsl_dir's dd_lock */
 	list_t ds_prop_cbs;
 
@@ -242,6 +262,7 @@ int dsl_dataset_own_obj(struct dsl_pool *dp, uint64_t dsobj,
 void dsl_dataset_disown(dsl_dataset_t *ds, void *tag);
 void dsl_dataset_name(dsl_dataset_t *ds, char *name);
 boolean_t dsl_dataset_tryown(dsl_dataset_t *ds, void *tag);
+boolean_t dsl_dataset_has_owner(dsl_dataset_t *ds);
 uint64_t dsl_dataset_create_sync(dsl_dir_t *pds, const char *lastname,
     dsl_dataset_t *origin, uint64_t flags, cred_t *, dmu_tx_t *);
 uint64_t dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
@@ -322,6 +343,8 @@ int dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx,
 void dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
     zprop_source_t source, uint64_t value, dmu_tx_t *tx);
 void dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx);
+boolean_t dsl_dataset_is_zapified(dsl_dataset_t *ds);
+boolean_t dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds);
 int dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result);
 
 void dsl_dataset_deactivate_feature(uint64_t dsobj,