freebsd-nq/module/zfs/dmu_diff.c
Paul Dagnelie 30af21b025 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 <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
2019-06-19 09:48:12 -07:00

237 lines
6.2 KiB
C

/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2018 by Delphix. All rights reserved.
*/
#include <sys/dmu.h>
#include <sys/dmu_impl.h>
#include <sys/dmu_tx.h>
#include <sys/dbuf.h>
#include <sys/dnode.h>
#include <sys/zfs_context.h>
#include <sys/dmu_objset.h>
#include <sys/dmu_traverse.h>
#include <sys/dsl_dataset.h>
#include <sys/dsl_dir.h>
#include <sys/dsl_pool.h>
#include <sys/dsl_synctask.h>
#include <sys/zfs_ioctl.h>
#include <sys/zap.h>
#include <sys/zio_checksum.h>
#include <sys/zfs_znode.h>
struct diffarg {
struct vnode *da_vp; /* file to which we are reporting */
offset_t *da_offp;
int da_err; /* error that stopped diff search */
dmu_diff_record_t da_ddr;
};
static int
write_record(struct diffarg *da)
{
ssize_t resid; /* have to get resid to get detailed errno */
if (da->da_ddr.ddr_type == DDR_NONE) {
da->da_err = 0;
return (0);
}
da->da_err = vn_rdwr(UIO_WRITE, da->da_vp, (caddr_t)&da->da_ddr,
sizeof (da->da_ddr), 0, UIO_SYSSPACE, FAPPEND,
RLIM64_INFINITY, CRED(), &resid);
*da->da_offp += sizeof (da->da_ddr);
return (da->da_err);
}
static int
report_free_dnode_range(struct diffarg *da, uint64_t first, uint64_t last)
{
ASSERT(first <= last);
if (da->da_ddr.ddr_type != DDR_FREE ||
first != da->da_ddr.ddr_last + 1) {
if (write_record(da) != 0)
return (da->da_err);
da->da_ddr.ddr_type = DDR_FREE;
da->da_ddr.ddr_first = first;
da->da_ddr.ddr_last = last;
return (0);
}
da->da_ddr.ddr_last = last;
return (0);
}
static int
report_dnode(struct diffarg *da, uint64_t object, dnode_phys_t *dnp)
{
ASSERT(dnp != NULL);
if (dnp->dn_type == DMU_OT_NONE)
return (report_free_dnode_range(da, object, object));
if (da->da_ddr.ddr_type != DDR_INUSE ||
object != da->da_ddr.ddr_last + 1) {
if (write_record(da) != 0)
return (da->da_err);
da->da_ddr.ddr_type = DDR_INUSE;
da->da_ddr.ddr_first = da->da_ddr.ddr_last = object;
return (0);
}
da->da_ddr.ddr_last = object;
return (0);
}
#define DBP_SPAN(dnp, level) \
(((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \
(level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)))
/* ARGSUSED */
static int
diff_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg)
{
struct diffarg *da = arg;
int err = 0;
if (issig(JUSTLOOKING) && issig(FORREAL))
return (SET_ERROR(EINTR));
if (zb->zb_level == ZB_DNODE_LEVEL ||
zb->zb_object != DMU_META_DNODE_OBJECT)
return (0);
if (BP_IS_HOLE(bp)) {
uint64_t span = DBP_SPAN(dnp, zb->zb_level);
uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
err = report_free_dnode_range(da, dnobj,
dnobj + (span >> DNODE_SHIFT) - 1);
if (err)
return (err);
} else if (zb->zb_level == 0) {
dnode_phys_t *blk;
arc_buf_t *abuf;
arc_flags_t aflags = ARC_FLAG_WAIT;
int blksz = BP_GET_LSIZE(bp);
int zio_flags = ZIO_FLAG_CANFAIL;
int i;
if (BP_IS_PROTECTED(bp))
zio_flags |= ZIO_FLAG_RAW;
if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
ZIO_PRIORITY_ASYNC_READ, zio_flags, &aflags, zb) != 0)
return (SET_ERROR(EIO));
blk = abuf->b_data;
for (i = 0; i < blksz >> DNODE_SHIFT; i++) {
uint64_t dnobj = (zb->zb_blkid <<
(DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i;
err = report_dnode(da, dnobj, blk+i);
if (err)
break;
}
arc_buf_destroy(abuf, &abuf);
if (err)
return (err);
/* Don't care about the data blocks */
return (TRAVERSE_VISIT_NO_CHILDREN);
}
return (0);
}
int
dmu_diff(const char *tosnap_name, const char *fromsnap_name,
struct vnode *vp, offset_t *offp)
{
struct diffarg da;
dsl_dataset_t *fromsnap;
dsl_dataset_t *tosnap;
dsl_pool_t *dp;
int error;
uint64_t fromtxg;
if (strchr(tosnap_name, '@') == NULL ||
strchr(fromsnap_name, '@') == NULL)
return (SET_ERROR(EINVAL));
error = dsl_pool_hold(tosnap_name, FTAG, &dp);
if (error != 0)
return (error);
error = dsl_dataset_hold(dp, tosnap_name, FTAG, &tosnap);
if (error != 0) {
dsl_pool_rele(dp, FTAG);
return (error);
}
error = dsl_dataset_hold(dp, fromsnap_name, FTAG, &fromsnap);
if (error != 0) {
dsl_dataset_rele(tosnap, FTAG);
dsl_pool_rele(dp, FTAG);
return (error);
}
if (!dsl_dataset_is_before(tosnap, fromsnap, 0)) {
dsl_dataset_rele(fromsnap, FTAG);
dsl_dataset_rele(tosnap, FTAG);
dsl_pool_rele(dp, FTAG);
return (SET_ERROR(EXDEV));
}
fromtxg = dsl_dataset_phys(fromsnap)->ds_creation_txg;
dsl_dataset_rele(fromsnap, FTAG);
dsl_dataset_long_hold(tosnap, FTAG);
dsl_pool_rele(dp, FTAG);
da.da_vp = vp;
da.da_offp = offp;
da.da_ddr.ddr_type = DDR_NONE;
da.da_ddr.ddr_first = da.da_ddr.ddr_last = 0;
da.da_err = 0;
/*
* Since zfs diff only looks at dnodes which are stored in plaintext
* (other than bonus buffers), we don't technically need to decrypt
* the dataset to perform this operation. However, the command line
* utility will still fail if the keys are not loaded because the
* dataset isn't mounted and because it will fail when it attempts to
* call the ZFS_IOC_OBJ_TO_STATS ioctl.
*/
error = traverse_dataset(tosnap, fromtxg,
TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA | TRAVERSE_NO_DECRYPT,
diff_cb, &da);
if (error != 0) {
da.da_err = error;
} else {
/* we set the da.da_err we return as side-effect */
(void) write_record(&da);
}
dsl_dataset_long_rele(tosnap, FTAG);
dsl_dataset_rele(tosnap, FTAG);
return (da.da_err);
}