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Implement Redacted Send/Receive

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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 <dan.kimmel@delphix.com>
Reviewed-by: Matt Ahrens <mahrens@delphix.com>
Reviewed-by: Prashanth Sreenivasa <pks@delphix.com>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Reviewed-by: George Wilson <george.wilson@delphix.com>
Reviewed-by: Chris Williamson <chris.williamson@delphix.com>
Reviewed-by: Pavel Zhakarov <pavel.zakharov@delphix.com>
Reviewed-by: Sebastien Roy <sebastien.roy@delphix.com>
Reviewed-by: Prakash Surya <prakash.surya@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Paul Dagnelie <pcd@delphix.com>
Closes #7958
This commit is contained in:
Paul Dagnelie
2019-06-19 09:48:13 -07:00
committed by Brian Behlendorf
parent c1b5801bb5
commit 30af21b025
103 changed files with 11513 additions and 2668 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/sys/zfs_ioctl.h
+11 -4
View File
@@ -20,7 +20,7 @@
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2017 by Delphix. All rights reserved.
* Copyright (c) 2012, 2018 by Delphix. All rights reserved.
* Copyright 2016 RackTop Systems.
* Copyright (c) 2017, Intel Corporation.
*/
@@ -101,7 +101,7 @@ typedef enum drr_headertype {
/* flag #18 is reserved for a Delphix feature */
#define DMU_BACKUP_FEATURE_LARGE_BLOCKS (1 << 19)
#define DMU_BACKUP_FEATURE_RESUMING (1 << 20)
/* flag #21 is reserved for the redacted send/receive feature */
#define DMU_BACKUP_FEATURE_REDACTED (1 << 21)
#define DMU_BACKUP_FEATURE_COMPRESSED (1 << 22)
#define DMU_BACKUP_FEATURE_LARGE_DNODE (1 << 23)
#define DMU_BACKUP_FEATURE_RAW (1 << 24)
@@ -116,7 +116,8 @@ typedef enum drr_headertype {
DMU_BACKUP_FEATURE_EMBED_DATA | DMU_BACKUP_FEATURE_LZ4 | \
DMU_BACKUP_FEATURE_RESUMING | DMU_BACKUP_FEATURE_LARGE_BLOCKS | \
DMU_BACKUP_FEATURE_COMPRESSED | DMU_BACKUP_FEATURE_LARGE_DNODE | \
DMU_BACKUP_FEATURE_RAW | DMU_BACKUP_FEATURE_HOLDS)
DMU_BACKUP_FEATURE_RAW | DMU_BACKUP_FEATURE_HOLDS | \
DMU_BACKUP_FEATURE_REDACTED)
/* Are all features in the given flag word currently supported? */
#define DMU_STREAM_SUPPORTED(x) (!((x) & ~DMU_BACKUP_FEATURE_MASK))
@@ -212,7 +213,7 @@ typedef struct dmu_replay_record {
enum {
DRR_BEGIN, DRR_OBJECT, DRR_FREEOBJECTS,
DRR_WRITE, DRR_FREE, DRR_END, DRR_WRITE_BYREF,
DRR_SPILL, DRR_WRITE_EMBEDDED, DRR_OBJECT_RANGE,
DRR_SPILL, DRR_WRITE_EMBEDDED, DRR_OBJECT_RANGE, DRR_REDACT,
DRR_NUMTYPES
} drr_type;
uint32_t drr_payloadlen;
@@ -337,6 +338,12 @@ typedef struct dmu_replay_record {
uint8_t drr_flags;
uint8_t drr_pad[3];
} drr_object_range;
struct drr_redact {
uint64_t drr_object;
uint64_t drr_offset;
uint64_t drr_length;
uint64_t drr_toguid;
} drr_redact;
/*
* Nore: drr_checksum is overlaid with all record types