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, 76 insertions, 2 deletions

diff --git a/man/man5/zfs-module-parameters.5 b/man/man5/zfs-module-parameters.5
index 77b4c2801..9462608f9 100644
--- a/man/man5/zfs-module-parameters.5
+++ b/man/man5/zfs-module-parameters.5
@@ -1853,6 +1853,18 @@ Default value: \fB1,048,576\fR.
 .sp
 .ne 2
 .na
+\fBzfs_allow_redacted_dataset_mount\fR (int)
+.ad
+.RS 12n
+Allow datasets received with redacted send/receive to be mounted. Normally
+disabled because these datasets may be missing key data.
+.sp
+Default value: \fB0\fR.
+.RE
+
+.sp
+.ne 2
+.na
 \fBzfs_metaslab_fragmentation_threshold\fR (int)
 .ad
 .RS 12n
@@ -2441,11 +2453,46 @@ Use \fB1\fR for yes (default) and \fB0\fR for no.
 .sp
 .ne 2
 .na
+\fBzfs_send_no_prefetch_queue_ff\fR (int)
+.ad
+.RS 12n
+The fill fraction of the \fBzfs send\fR internal queues. The fill fraction
+controls the timing with which internal threads are woken up.
+.sp
+Default value: \fB20\fR.
+.RE
+
+.sp
+.ne 2
+.na
+\fBzfs_send_no_prefetch_queue_length\fR (int)
+.ad
+.RS 12n
+The maximum number of bytes allowed in \fBzfs send\fR's internal queues.
+.sp
+Default value: \fB1,048,576\fR.
+.RE
+
+.sp
+.ne 2
+.na
+\fBzfs_send_queue_ff\fR (int)
+.ad
+.RS 12n
+The fill fraction of the \fBzfs send\fR prefetch queue. The fill fraction
+controls the timing with which internal threads are woken up.
+.sp
+Default value: \fB20\fR.
+.RE
+
+.sp
+.ne 2
+.na
 \fBzfs_send_queue_length\fR (int)
 .ad
 .RS 12n
-The maximum number of bytes allowed in the \fBzfs send\fR queue. This value
-must be at least twice the maximum block size in use.
+The maximum number of bytes allowed that will be prefetched by \fBzfs send\fR.
+This value must be at least twice the maximum block size in use.
 .sp
 Default value: \fB16,777,216\fR.
 .RE
@@ -2453,6 +2500,18 @@ Default value: \fB16,777,216\fR.
 .sp
 .ne 2
 .na
+\fBzfs_recv_queue_ff\fR (int)
+.ad
+.RS 12n
+The fill fraction of the \fBzfs receive\fR queue. The fill fraction
+controls the timing with which internal threads are woken up.
+.sp
+Default value: \fB20\fR.
+.RE
+
+.sp
+.ne 2
+.na
 \fBzfs_recv_queue_length\fR (int)
 .ad
 .RS 12n
@@ -2465,6 +2524,21 @@ Default value: \fB16,777,216\fR.
 .sp
 .ne 2
 .na
+\fBzfs_override_estimate_recordsize\fR (ulong)
+.ad
+.RS 12n
+Setting this variable overrides the default logic for estimating block
+sizes when doing a zfs send. The default heuristic is that the average
+block size will be the current recordsize. Override this value if most data
+in your dataset is not of that size and you require accurate zfs send size
+estimates.
+.sp
+Default value: \fB0\fR.
+.RE
+
+.sp
+.ne 2
+.na
 \fBzfs_sync_pass_deferred_free\fR (int)
 .ad
 .RS 12n