Implement Redacted Send/Receive

Redacted send/receive allows users to send subsets of their data to 
a target system. One possible use case for this feature is to not 
transmit sensitive information to a data warehousing, test/dev, or 
analytics environment. Another is to save space by not replicating 
unimportant data within a given dataset, for example in backup tools 
like zrepl.

Redacted send/receive is a three-stage process. First, a clone (or 
clones) is made of the snapshot to be sent to the target. In this 
clone (or clones), all unnecessary or unwanted data is removed or
modified. This clone is then snapshotted to create the "redaction 
snapshot" (or snapshots). Second, the new zfs redact command is used 
to create a redaction bookmark. The redaction bookmark stores the 
list of blocks in a snapshot that were modified by the redaction 
snapshot(s). Finally, the redaction bookmark is passed as a parameter 
to zfs send. When sending to the snapshot that was redacted, the
redaction bookmark is used to filter out blocks that contain sensitive 
or unwanted information, and those blocks are not included in the send 
stream.  When sending from the redaction bookmark, the blocks it 
contains are considered as candidate blocks in addition to those 
blocks in the destination snapshot that were modified since the 
creation_txg of the redaction bookmark.  This step is necessary to 
allow the target to rehydrate data in the case where some blocks are 
accidentally or unnecessarily modified in the redaction snapshot.

The changes to bookmarks to enable fast space estimation involve 
adding deadlists to bookmarks. There is also logic to manage the 
life cycles of these deadlists.

The new size estimation process operates in cases where previously 
an accurate estimate could not be provided. In those cases, a send 
is performed where no data blocks are read, reducing the runtime 
significantly and providing a byte-accurate size estimate.

Reviewed-by: Dan Kimmel <[email protected]>
Reviewed-by: Matt Ahrens <[email protected]>
Reviewed-by: Prashanth Sreenivasa <[email protected]>
Reviewed-by: John Kennedy <[email protected]>
Reviewed-by: George Wilson <[email protected]>
Reviewed-by: Chris Williamson <[email protected]>
Reviewed-by: Pavel Zhakarov <[email protected]>
Reviewed-by: Sebastien Roy <[email protected]>
Reviewed-by: Prakash Surya <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Paul Dagnelie <[email protected]>
Closes #7958 

1 files changed, 27 insertions, 10 deletions

diff --git a/include/sys/dmu_send.h b/include/sys/dmu_send.h
index 2e4d54b4f..2f3dfc39f 100644
--- a/include/sys/dmu_send.h
+++ b/include/sys/dmu_send.h
@@ -21,7 +21,7 @@
 
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
+ * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
  * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
  * Copyright (c) 2013, Joyent, Inc. All rights reserved.
  */
@@ -31,23 +31,40 @@
 
 #include <sys/inttypes.h>
 #include <sys/dsl_crypt.h>
+#include <sys/dsl_bookmark.h>
 #include <sys/spa.h>
+#include <sys/objlist.h>
+#include <sys/dsl_bookmark.h>
+#include <sys/dmu_redact.h>
+
+#define	BEGINNV_REDACT_SNAPS		"redact_snaps"
+#define	BEGINNV_REDACT_FROM_SNAPS	"redact_from_snaps"
+#define	BEGINNV_RESUME_OBJECT		"resume_object"
+#define	BEGINNV_RESUME_OFFSET		"resume_offset"
 
 struct vnode;
 struct dsl_dataset;
 struct drr_begin;
 struct avl_tree;
 struct dmu_replay_record;
-
-int dmu_send(const char *tosnap, const char *fromsnap, boolean_t embedok,
-    boolean_t large_block_ok, boolean_t compressok, boolean_t rawok, int outfd,
-    uint64_t resumeobj, uint64_t resumeoff, struct vnode *vp, offset_t *off);
-int dmu_send_estimate(struct dsl_dataset *ds, struct dsl_dataset *fromds,
-    boolean_t stream_compressed, uint64_t *sizep);
-int dmu_send_estimate_from_txg(struct dsl_dataset *ds, uint64_t fromtxg,
-    boolean_t stream_compressed, uint64_t *sizep);
+struct dmu_send_outparams;
+int
+dmu_send(const char *tosnap, const char *fromsnap, boolean_t embedok,
+    boolean_t large_block_ok, boolean_t compressok, boolean_t rawok,
+    uint64_t resumeobj, uint64_t resumeoff, const char *redactbook, int outfd,
+    offset_t *off, struct dmu_send_outparams *dsop);
+int dmu_send_estimate_fast(struct dsl_dataset *ds, struct dsl_dataset *fromds,
+    zfs_bookmark_phys_t *frombook, boolean_t stream_compressed,
+    uint64_t *sizep);
 int dmu_send_obj(const char *pool, uint64_t tosnap, uint64_t fromsnap,
     boolean_t embedok, boolean_t large_block_ok, boolean_t compressok,
-    boolean_t rawok, int outfd, struct vnode *vp, offset_t *off);
+    boolean_t rawok, int outfd, offset_t *off, struct dmu_send_outparams *dso);
+
+typedef int (*dmu_send_outfunc_t)(objset_t *os, void *buf, int len, void *arg);
+typedef struct dmu_send_outparams {
+	dmu_send_outfunc_t	dso_outfunc;
+	void			*dso_arg;
+	boolean_t		dso_dryrun;
+} dmu_send_outparams_t;
 
 #endif /* _DMU_SEND_H */