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mirror_zfs/module/zfs/dmu_send.c
George Wilson 294f68063b Illumos #3498 panic in arc_read() 
3498 panic in arc_read(): !refcount_is_zero(&pbuf->b_hdr->b_refcnt)
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Richard Lowe <richlowe@richlowe.net>

References:
  illumos/illumos-gate@1b912ec710
  https://www.illumos.org/issues/3498

Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1249
2013-07-02 13:34:31 -07:00

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/*
* 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) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2011 by Delphix. All rights reserved.
* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 2011 by Delphix. All rights reserved.
* Copyright (c) 2012, Joyent, Inc. 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_prop.h>
#include <sys/dsl_pool.h>
#include <sys/dsl_synctask.h>
#include <sys/spa_impl.h>
#include <sys/zfs_ioctl.h>
#include <sys/zap.h>
#include <sys/zio_checksum.h>
#include <sys/zfs_znode.h>
#include <zfs_fletcher.h>
#include <sys/avl.h>
#include <sys/ddt.h>
#include <sys/zfs_onexit.h>
/* Set this tunable to TRUE to replace corrupt data with 0x2f5baddb10c */
int zfs_send_corrupt_data = B_FALSE;
static char *dmu_recv_tag = "dmu_recv_tag";
typedef struct dump_bytes_io {
dmu_sendarg_t *dbi_dsp;
void *dbi_buf;
int dbi_len;
} dump_bytes_io_t;
static void
dump_bytes_strategy(void *arg)
{
dump_bytes_io_t *dbi = (dump_bytes_io_t *)arg;
dmu_sendarg_t *dsp = dbi->dbi_dsp;
dsl_dataset_t *ds = dsp->dsa_os->os_dsl_dataset;
ssize_t resid; /* have to get resid to get detailed errno */
ASSERT0(dbi->dbi_len % 8);
fletcher_4_incremental_native(dbi->dbi_buf, dbi->dbi_len, &dsp->dsa_zc);
dsp->dsa_err = vn_rdwr(UIO_WRITE, dsp->dsa_vp,
(caddr_t)dbi->dbi_buf, dbi->dbi_len,
0, UIO_SYSSPACE, FAPPEND, RLIM64_INFINITY, CRED(), &resid);
mutex_enter(&ds->ds_sendstream_lock);
*dsp->dsa_off += dbi->dbi_len;
mutex_exit(&ds->ds_sendstream_lock);
}
static int
dump_bytes(dmu_sendarg_t *dsp, void *buf, int len)
{
dump_bytes_io_t dbi;
dbi.dbi_dsp = dsp;
dbi.dbi_buf = buf;
dbi.dbi_len = len;
/*
* The vn_rdwr() call is performed in a taskq to ensure that there is
* always enough stack space to write safely to the target filesystem.
* The ZIO_TYPE_FREE threads are used because there can be a lot of
* them and they are used in vdev_file.c for a similar purpose.
*/
spa_taskq_dispatch_sync(dmu_objset_spa(dsp->dsa_os), ZIO_TYPE_FREE,
ZIO_TASKQ_ISSUE, dump_bytes_strategy, &dbi, TQ_SLEEP);
return (dsp->dsa_err);
}
static int
dump_free(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset,
uint64_t length)
{
struct drr_free *drrf = &(dsp->dsa_drr->drr_u.drr_free);
if (length != -1ULL && offset + length < offset)
length = -1ULL;
/*
* If there is a pending op, but it's not PENDING_FREE, push it out,
* since free block aggregation can only be done for blocks of the
* same type (i.e., DRR_FREE records can only be aggregated with
* other DRR_FREE records. DRR_FREEOBJECTS records can only be
* aggregated with other DRR_FREEOBJECTS records.
*/
if (dsp->dsa_pending_op != PENDING_NONE &&
dsp->dsa_pending_op != PENDING_FREE) {
if (dump_bytes(dsp, dsp->dsa_drr,
sizeof (dmu_replay_record_t)) != 0)
return (EINTR);
dsp->dsa_pending_op = PENDING_NONE;
}
if (dsp->dsa_pending_op == PENDING_FREE) {
/*
* There should never be a PENDING_FREE if length is -1
* (because dump_dnode is the only place where this
* function is called with a -1, and only after flushing
* any pending record).
*/
ASSERT(length != -1ULL);
/*
* Check to see whether this free block can be aggregated
* with pending one.
*/
if (drrf->drr_object == object && drrf->drr_offset +
drrf->drr_length == offset) {
drrf->drr_length += length;
return (0);
} else {
/* not a continuation. Push out pending record */
if (dump_bytes(dsp, dsp->dsa_drr,
sizeof (dmu_replay_record_t)) != 0)
return (EINTR);
dsp->dsa_pending_op = PENDING_NONE;
}
}
/* create a FREE record and make it pending */
bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
dsp->dsa_drr->drr_type = DRR_FREE;
drrf->drr_object = object;
drrf->drr_offset = offset;
drrf->drr_length = length;
drrf->drr_toguid = dsp->dsa_toguid;
if (length == -1ULL) {
if (dump_bytes(dsp, dsp->dsa_drr,
sizeof (dmu_replay_record_t)) != 0)
return (EINTR);
} else {
dsp->dsa_pending_op = PENDING_FREE;
}
return (0);
}
static int
dump_data(dmu_sendarg_t *dsp, dmu_object_type_t type,
uint64_t object, uint64_t offset, int blksz, const blkptr_t *bp, void *data)
{
struct drr_write *drrw = &(dsp->dsa_drr->drr_u.drr_write);
/*
* If there is any kind of pending aggregation (currently either
* a grouping of free objects or free blocks), push it out to
* the stream, since aggregation can't be done across operations
* of different types.
*/
if (dsp->dsa_pending_op != PENDING_NONE) {
if (dump_bytes(dsp, dsp->dsa_drr,
sizeof (dmu_replay_record_t)) != 0)
return (EINTR);
dsp->dsa_pending_op = PENDING_NONE;
}
/* write a DATA record */
bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
dsp->dsa_drr->drr_type = DRR_WRITE;
drrw->drr_object = object;
drrw->drr_type = type;
drrw->drr_offset = offset;
drrw->drr_length = blksz;
drrw->drr_toguid = dsp->dsa_toguid;
drrw->drr_checksumtype = BP_GET_CHECKSUM(bp);
if (zio_checksum_table[drrw->drr_checksumtype].ci_dedup)
drrw->drr_checksumflags |= DRR_CHECKSUM_DEDUP;
DDK_SET_LSIZE(&drrw->drr_key, BP_GET_LSIZE(bp));
DDK_SET_PSIZE(&drrw->drr_key, BP_GET_PSIZE(bp));
DDK_SET_COMPRESS(&drrw->drr_key, BP_GET_COMPRESS(bp));
drrw->drr_key.ddk_cksum = bp->blk_cksum;
if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
return (EINTR);
if (dump_bytes(dsp, data, blksz) != 0)
return (EINTR);
return (0);
}
static int
dump_spill(dmu_sendarg_t *dsp, uint64_t object, int blksz, void *data)
{
struct drr_spill *drrs = &(dsp->dsa_drr->drr_u.drr_spill);
if (dsp->dsa_pending_op != PENDING_NONE) {
if (dump_bytes(dsp, dsp->dsa_drr,
sizeof (dmu_replay_record_t)) != 0)
return (EINTR);
dsp->dsa_pending_op = PENDING_NONE;
}
/* write a SPILL record */
bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
dsp->dsa_drr->drr_type = DRR_SPILL;
drrs->drr_object = object;
drrs->drr_length = blksz;
drrs->drr_toguid = dsp->dsa_toguid;
if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)))
return (EINTR);
if (dump_bytes(dsp, data, blksz))
return (EINTR);
return (0);
}
static int
dump_freeobjects(dmu_sendarg_t *dsp, uint64_t firstobj, uint64_t numobjs)
{
struct drr_freeobjects *drrfo = &(dsp->dsa_drr->drr_u.drr_freeobjects);
/*
* If there is a pending op, but it's not PENDING_FREEOBJECTS,
* push it out, since free block aggregation can only be done for
* blocks of the same type (i.e., DRR_FREE records can only be
* aggregated with other DRR_FREE records. DRR_FREEOBJECTS records
* can only be aggregated with other DRR_FREEOBJECTS records.
*/
if (dsp->dsa_pending_op != PENDING_NONE &&
dsp->dsa_pending_op != PENDING_FREEOBJECTS) {
if (dump_bytes(dsp, dsp->dsa_drr,
sizeof (dmu_replay_record_t)) != 0)
return (EINTR);
dsp->dsa_pending_op = PENDING_NONE;
}
if (dsp->dsa_pending_op == PENDING_FREEOBJECTS) {
/*
* See whether this free object array can be aggregated
* with pending one
*/
if (drrfo->drr_firstobj + drrfo->drr_numobjs == firstobj) {
drrfo->drr_numobjs += numobjs;
return (0);
} else {
/* can't be aggregated. Push out pending record */
if (dump_bytes(dsp, dsp->dsa_drr,
sizeof (dmu_replay_record_t)) != 0)
return (EINTR);
dsp->dsa_pending_op = PENDING_NONE;
}
}
/* write a FREEOBJECTS record */
bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
dsp->dsa_drr->drr_type = DRR_FREEOBJECTS;
drrfo->drr_firstobj = firstobj;
drrfo->drr_numobjs = numobjs;
drrfo->drr_toguid = dsp->dsa_toguid;
dsp->dsa_pending_op = PENDING_FREEOBJECTS;
return (0);
}
static int
dump_dnode(dmu_sendarg_t *dsp, uint64_t object, dnode_phys_t *dnp)
{
struct drr_object *drro = &(dsp->dsa_drr->drr_u.drr_object);
if (dnp == NULL || dnp->dn_type == DMU_OT_NONE)
return (dump_freeobjects(dsp, object, 1));
if (dsp->dsa_pending_op != PENDING_NONE) {
if (dump_bytes(dsp, dsp->dsa_drr,
sizeof (dmu_replay_record_t)) != 0)
return (EINTR);
dsp->dsa_pending_op = PENDING_NONE;
}
/* write an OBJECT record */
bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
dsp->dsa_drr->drr_type = DRR_OBJECT;
drro->drr_object = object;
drro->drr_type = dnp->dn_type;
drro->drr_bonustype = dnp->dn_bonustype;
drro->drr_blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
drro->drr_bonuslen = dnp->dn_bonuslen;
drro->drr_checksumtype = dnp->dn_checksum;
drro->drr_compress = dnp->dn_compress;
drro->drr_toguid = dsp->dsa_toguid;
if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
return (EINTR);
if (dump_bytes(dsp, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)) != 0)
return (EINTR);
/* free anything past the end of the file */
if (dump_free(dsp, object, (dnp->dn_maxblkid + 1) *
(dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL))
return (EINTR);
if (dsp->dsa_err)
return (EINTR);
return (0);
}
#define BP_SPAN(dnp, level) \
(((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \
(level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)))
/* ARGSUSED */
static int
backup_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
{
dmu_sendarg_t *dsp = arg;
dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE;
int err = 0;
if (issig(JUSTLOOKING) && issig(FORREAL))
return (EINTR);
if (zb->zb_object != DMU_META_DNODE_OBJECT &&
DMU_OBJECT_IS_SPECIAL(zb->zb_object)) {
return (0);
} else if (bp == NULL && zb->zb_object == DMU_META_DNODE_OBJECT) {
uint64_t span = BP_SPAN(dnp, zb->zb_level);
uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
err = dump_freeobjects(dsp, dnobj, span >> DNODE_SHIFT);
} else if (bp == NULL) {
uint64_t span = BP_SPAN(dnp, zb->zb_level);
err = dump_free(dsp, zb->zb_object, zb->zb_blkid * span, span);
} else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) {
return (0);
} else if (type == DMU_OT_DNODE) {
dnode_phys_t *blk;
int i;
int blksz = BP_GET_LSIZE(bp);
uint32_t aflags = ARC_WAIT;
arc_buf_t *abuf;
if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
&aflags, zb) != 0)
return (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 = dump_dnode(dsp, dnobj, blk+i);
if (err)
break;
}
(void) arc_buf_remove_ref(abuf, &abuf);
} else if (type == DMU_OT_SA) {
uint32_t aflags = ARC_WAIT;
arc_buf_t *abuf;
int blksz = BP_GET_LSIZE(bp);
if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
&aflags, zb) != 0)
return (EIO);
err = dump_spill(dsp, zb->zb_object, blksz, abuf->b_data);
(void) arc_buf_remove_ref(abuf, &abuf);
} else { /* it's a level-0 block of a regular object */
uint32_t aflags = ARC_WAIT;
arc_buf_t *abuf;
int blksz = BP_GET_LSIZE(bp);
if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
&aflags, zb) != 0) {
if (zfs_send_corrupt_data) {
uint64_t *ptr;
/* Send a block filled with 0x"zfs badd bloc" */
abuf = arc_buf_alloc(spa, blksz, &abuf,
ARC_BUFC_DATA);
for (ptr = abuf->b_data;
(char *)ptr < (char *)abuf->b_data + blksz;
ptr++)
*ptr = 0x2f5baddb10cULL;
} else {
return (EIO);
}
}
err = dump_data(dsp, type, zb->zb_object, zb->zb_blkid * blksz,
blksz, bp, abuf->b_data);
(void) arc_buf_remove_ref(abuf, &abuf);
}
ASSERT(err == 0 || err == EINTR);
return (err);
}
int
dmu_send(objset_t *tosnap, objset_t *fromsnap, boolean_t fromorigin,
int outfd, vnode_t *vp, offset_t *off)
{
dsl_dataset_t *ds = tosnap->os_dsl_dataset;
dsl_dataset_t *fromds = fromsnap ? fromsnap->os_dsl_dataset : NULL;
dmu_replay_record_t *drr;
dmu_sendarg_t *dsp;
int err;
uint64_t fromtxg = 0;
/* tosnap must be a snapshot */
if (ds->ds_phys->ds_next_snap_obj == 0)
return (EINVAL);
/* fromsnap must be an earlier snapshot from the same fs as tosnap */
if (fromds && (ds->ds_dir != fromds->ds_dir ||
fromds->ds_phys->ds_creation_txg >= ds->ds_phys->ds_creation_txg))
return (EXDEV);
if (fromorigin) {
dsl_pool_t *dp = ds->ds_dir->dd_pool;
if (fromsnap)
return (EINVAL);
if (dsl_dir_is_clone(ds->ds_dir)) {
rw_enter(&dp->dp_config_rwlock, RW_READER);
err = dsl_dataset_hold_obj(dp,
ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &fromds);
rw_exit(&dp->dp_config_rwlock);
if (err)
return (err);
} else {
fromorigin = B_FALSE;
}
}
drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
drr->drr_type = DRR_BEGIN;
drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
DMU_SET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo,
DMU_SUBSTREAM);
#ifdef _KERNEL
if (dmu_objset_type(tosnap) == DMU_OST_ZFS) {
uint64_t version;
if (zfs_get_zplprop(tosnap, ZFS_PROP_VERSION, &version) != 0) {
kmem_free(drr, sizeof (dmu_replay_record_t));
return (EINVAL);
}
if (version == ZPL_VERSION_SA) {
DMU_SET_FEATUREFLAGS(
drr->drr_u.drr_begin.drr_versioninfo,
DMU_BACKUP_FEATURE_SA_SPILL);
}
}
#endif
drr->drr_u.drr_begin.drr_creation_time =
ds->ds_phys->ds_creation_time;
drr->drr_u.drr_begin.drr_type = tosnap->os_phys->os_type;
if (fromorigin)
drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE;
drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid;
if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET)
drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA;
if (fromds)
drr->drr_u.drr_begin.drr_fromguid = fromds->ds_phys->ds_guid;
dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname);
if (fromds)
fromtxg = fromds->ds_phys->ds_creation_txg;
if (fromorigin)
dsl_dataset_rele(fromds, FTAG);
dsp = kmem_zalloc(sizeof (dmu_sendarg_t), KM_SLEEP);
dsp->dsa_drr = drr;
dsp->dsa_vp = vp;
dsp->dsa_outfd = outfd;
dsp->dsa_proc = curproc;
dsp->dsa_os = tosnap;
dsp->dsa_off = off;
dsp->dsa_toguid = ds->ds_phys->ds_guid;
ZIO_SET_CHECKSUM(&dsp->dsa_zc, 0, 0, 0, 0);
dsp->dsa_pending_op = PENDING_NONE;
mutex_enter(&ds->ds_sendstream_lock);
list_insert_head(&ds->ds_sendstreams, dsp);
mutex_exit(&ds->ds_sendstream_lock);
if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
err = dsp->dsa_err;
goto out;
}
err = traverse_dataset(ds, fromtxg, TRAVERSE_PRE | TRAVERSE_PREFETCH,
backup_cb, dsp);
if (dsp->dsa_pending_op != PENDING_NONE)
if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0)
err = EINTR;
if (err) {
if (err == EINTR && dsp->dsa_err)
err = dsp->dsa_err;
goto out;
}
bzero(drr, sizeof (dmu_replay_record_t));
drr->drr_type = DRR_END;
drr->drr_u.drr_end.drr_checksum = dsp->dsa_zc;
drr->drr_u.drr_end.drr_toguid = dsp->dsa_toguid;
if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
err = dsp->dsa_err;
goto out;
}
out:
mutex_enter(&ds->ds_sendstream_lock);
list_remove(&ds->ds_sendstreams, dsp);
mutex_exit(&ds->ds_sendstream_lock);
kmem_free(drr, sizeof (dmu_replay_record_t));
kmem_free(dsp, sizeof (dmu_sendarg_t));
return (err);
}
int
dmu_send_estimate(objset_t *tosnap, objset_t *fromsnap, boolean_t fromorigin,
uint64_t *sizep)
{
dsl_dataset_t *ds = tosnap->os_dsl_dataset;
dsl_dataset_t *fromds = fromsnap ? fromsnap->os_dsl_dataset : NULL;
dsl_pool_t *dp = ds->ds_dir->dd_pool;
int err;
uint64_t size, recordsize;
/* tosnap must be a snapshot */
if (ds->ds_phys->ds_next_snap_obj == 0)
return (EINVAL);
/* fromsnap must be an earlier snapshot from the same fs as tosnap */
if (fromds && (ds->ds_dir != fromds->ds_dir ||
fromds->ds_phys->ds_creation_txg >= ds->ds_phys->ds_creation_txg))
return (EXDEV);
if (fromorigin) {
if (fromsnap)
return (EINVAL);
if (dsl_dir_is_clone(ds->ds_dir)) {
rw_enter(&dp->dp_config_rwlock, RW_READER);
err = dsl_dataset_hold_obj(dp,
ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &fromds);
rw_exit(&dp->dp_config_rwlock);
if (err)
return (err);
} else {
fromorigin = B_FALSE;
}
}
/* Get uncompressed size estimate of changed data. */
if (fromds == NULL) {
size = ds->ds_phys->ds_uncompressed_bytes;
} else {
uint64_t used, comp;
err = dsl_dataset_space_written(fromds, ds,
&used, &comp, &size);
if (fromorigin)
dsl_dataset_rele(fromds, FTAG);
if (err)
return (err);
}
/*
* Assume that space (both on-disk and in-stream) is dominated by
* data. We will adjust for indirect blocks and the copies property,
* but ignore per-object space used (eg, dnodes and DRR_OBJECT records).
*/
/*
* Subtract out approximate space used by indirect blocks.
* Assume most space is used by data blocks (non-indirect, non-dnode).
* Assume all blocks are recordsize. Assume ditto blocks and
* internal fragmentation counter out compression.
*
* Therefore, space used by indirect blocks is sizeof(blkptr_t) per
* block, which we observe in practice.
*/
rw_enter(&dp->dp_config_rwlock, RW_READER);
err = dsl_prop_get_ds(ds, "recordsize",
sizeof (recordsize), 1, &recordsize, NULL);
rw_exit(&dp->dp_config_rwlock);
if (err)
return (err);
size -= size / recordsize * sizeof (blkptr_t);
/* Add in the space for the record associated with each block. */
size += size / recordsize * sizeof (dmu_replay_record_t);
*sizep = size;
return (0);
}
struct recvbeginsyncarg {
const char *tofs;
const char *tosnap;
dsl_dataset_t *origin;
uint64_t fromguid;
dmu_objset_type_t type;
void *tag;
boolean_t force;
uint64_t dsflags;
char clonelastname[MAXNAMELEN];
dsl_dataset_t *ds; /* the ds to recv into; returned from the syncfunc */
cred_t *cr;
};
/* ARGSUSED */
static int
recv_new_check(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dir_t *dd = arg1;
struct recvbeginsyncarg *rbsa = arg2;
objset_t *mos = dd->dd_pool->dp_meta_objset;
uint64_t val;
int err;
err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj,
strrchr(rbsa->tofs, '/') + 1, sizeof (uint64_t), 1, &val);
if (err != ENOENT)
return (err ? err : EEXIST);
if (rbsa->origin) {
/* make sure it's a snap in the same pool */
if (rbsa->origin->ds_dir->dd_pool != dd->dd_pool)
return (EXDEV);
if (!dsl_dataset_is_snapshot(rbsa->origin))
return (EINVAL);
if (rbsa->origin->ds_phys->ds_guid != rbsa->fromguid)
return (ENODEV);
}
return (0);
}
static void
recv_new_sync(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dir_t *dd = arg1;
struct recvbeginsyncarg *rbsa = arg2;
uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
uint64_t dsobj;
/* Create and open new dataset. */
dsobj = dsl_dataset_create_sync(dd, strrchr(rbsa->tofs, '/') + 1,
rbsa->origin, flags, rbsa->cr, tx);
VERIFY(0 == dsl_dataset_own_obj(dd->dd_pool, dsobj,
B_TRUE, dmu_recv_tag, &rbsa->ds));
if (rbsa->origin == NULL) {
(void) dmu_objset_create_impl(dd->dd_pool->dp_spa,
rbsa->ds, &rbsa->ds->ds_phys->ds_bp, rbsa->type, tx);
}
spa_history_log_internal(LOG_DS_REPLAY_FULL_SYNC,
dd->dd_pool->dp_spa, tx, "dataset = %lld", dsobj);
}
/* ARGSUSED */
static int
recv_existing_check(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
struct recvbeginsyncarg *rbsa = arg2;
int err;
uint64_t val;
/* must not have any changes since most recent snapshot */
if (!rbsa->force && dsl_dataset_modified_since_lastsnap(ds))
return (ETXTBSY);
/* new snapshot name must not exist */
err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset,
ds->ds_phys->ds_snapnames_zapobj, rbsa->tosnap, 8, 1, &val);
if (err == 0)
return (EEXIST);
if (err != ENOENT)
return (err);
if (rbsa->fromguid) {
/* if incremental, most recent snapshot must match fromguid */
if (ds->ds_prev == NULL)
return (ENODEV);
/*
* most recent snapshot must match fromguid, or there are no
* changes since the fromguid one
*/
if (ds->ds_prev->ds_phys->ds_guid != rbsa->fromguid) {
uint64_t birth = ds->ds_prev->ds_phys->ds_bp.blk_birth;
uint64_t obj = ds->ds_prev->ds_phys->ds_prev_snap_obj;
while (obj != 0) {
dsl_dataset_t *snap;
err = dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
obj, FTAG, &snap);
if (err)
return (ENODEV);
if (snap->ds_phys->ds_creation_txg < birth) {
dsl_dataset_rele(snap, FTAG);
return (ENODEV);
}
if (snap->ds_phys->ds_guid == rbsa->fromguid) {
dsl_dataset_rele(snap, FTAG);
break; /* it's ok */
}
obj = snap->ds_phys->ds_prev_snap_obj;
dsl_dataset_rele(snap, FTAG);
}
if (obj == 0)
return (ENODEV);
}
} else {
/* if full, most recent snapshot must be $ORIGIN */
if (ds->ds_phys->ds_prev_snap_txg >= TXG_INITIAL)
return (ENODEV);
}
/* temporary clone name must not exist */
err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset,
ds->ds_dir->dd_phys->dd_child_dir_zapobj,
rbsa->clonelastname, 8, 1, &val);
if (err == 0)
return (EEXIST);
if (err != ENOENT)
return (err);
return (0);
}
/* ARGSUSED */
static void
recv_existing_sync(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dataset_t *ohds = arg1;
struct recvbeginsyncarg *rbsa = arg2;
dsl_pool_t *dp = ohds->ds_dir->dd_pool;
dsl_dataset_t *cds;
uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
uint64_t dsobj;
/* create and open the temporary clone */
dsobj = dsl_dataset_create_sync(ohds->ds_dir, rbsa->clonelastname,
ohds->ds_prev, flags, rbsa->cr, tx);
VERIFY(0 == dsl_dataset_own_obj(dp, dsobj, B_TRUE, dmu_recv_tag, &cds));
/*
* If we actually created a non-clone, we need to create the
* objset in our new dataset.
*/
if (BP_IS_HOLE(dsl_dataset_get_blkptr(cds))) {
(void) dmu_objset_create_impl(dp->dp_spa,
cds, dsl_dataset_get_blkptr(cds), rbsa->type, tx);
}
rbsa->ds = cds;
spa_history_log_internal(LOG_DS_REPLAY_INC_SYNC,
dp->dp_spa, tx, "dataset = %lld", dsobj);
}
static boolean_t
dmu_recv_verify_features(dsl_dataset_t *ds, struct drr_begin *drrb)
{
int featureflags;
featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
/* Verify pool version supports SA if SA_SPILL feature set */
return ((featureflags & DMU_BACKUP_FEATURE_SA_SPILL) &&
(spa_version(dsl_dataset_get_spa(ds)) < SPA_VERSION_SA));
}
/*
* NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin()
* succeeds; otherwise we will leak the holds on the datasets.
*/
int
dmu_recv_begin(char *tofs, char *tosnap, char *top_ds, struct drr_begin *drrb,
boolean_t force, objset_t *origin, dmu_recv_cookie_t *drc)
{
int err = 0;
boolean_t byteswap;
struct recvbeginsyncarg rbsa = { 0 };
uint64_t versioninfo;
int flags;
dsl_dataset_t *ds;
if (drrb->drr_magic == DMU_BACKUP_MAGIC)
byteswap = FALSE;
else if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
byteswap = TRUE;
else
return (EINVAL);
rbsa.tofs = tofs;
rbsa.tosnap = tosnap;
rbsa.origin = origin ? origin->os_dsl_dataset : NULL;
rbsa.fromguid = drrb->drr_fromguid;
rbsa.type = drrb->drr_type;
rbsa.tag = FTAG;
rbsa.dsflags = 0;
rbsa.cr = CRED();
versioninfo = drrb->drr_versioninfo;
flags = drrb->drr_flags;
if (byteswap) {
rbsa.type = BSWAP_32(rbsa.type);
rbsa.fromguid = BSWAP_64(rbsa.fromguid);
versioninfo = BSWAP_64(versioninfo);
flags = BSWAP_32(flags);
}
if (DMU_GET_STREAM_HDRTYPE(versioninfo) == DMU_COMPOUNDSTREAM ||
rbsa.type >= DMU_OST_NUMTYPES ||
((flags & DRR_FLAG_CLONE) && origin == NULL))
return (EINVAL);
if (flags & DRR_FLAG_CI_DATA)
rbsa.dsflags = DS_FLAG_CI_DATASET;
bzero(drc, sizeof (dmu_recv_cookie_t));
drc->drc_drrb = drrb;
drc->drc_tosnap = tosnap;
drc->drc_top_ds = top_ds;
drc->drc_force = force;
/*
* Process the begin in syncing context.
*/
/* open the dataset we are logically receiving into */
err = dsl_dataset_hold(tofs, dmu_recv_tag, &ds);
if (err == 0) {
if (dmu_recv_verify_features(ds, drrb)) {
dsl_dataset_rele(ds, dmu_recv_tag);
return (ENOTSUP);
}
/* target fs already exists; recv into temp clone */
/* Can't recv a clone into an existing fs */
if (flags & DRR_FLAG_CLONE) {
dsl_dataset_rele(ds, dmu_recv_tag);
return (EINVAL);
}
/* must not have an incremental recv already in progress */
if (!mutex_tryenter(&ds->ds_recvlock)) {
dsl_dataset_rele(ds, dmu_recv_tag);
return (EBUSY);
}
/* tmp clone name is: tofs/%tosnap" */
(void) snprintf(rbsa.clonelastname, sizeof (rbsa.clonelastname),
"%%%s", tosnap);
rbsa.force = force;
err = dsl_sync_task_do(ds->ds_dir->dd_pool,
recv_existing_check, recv_existing_sync, ds, &rbsa, 5);
if (err) {
mutex_exit(&ds->ds_recvlock);
dsl_dataset_rele(ds, dmu_recv_tag);
return (err);
}
drc->drc_logical_ds = ds;
drc->drc_real_ds = rbsa.ds;
} else if (err == ENOENT) {
/* target fs does not exist; must be a full backup or clone */
char *cp;
/*
* If it's a non-clone incremental, we are missing the
* target fs, so fail the recv.
*/
if (rbsa.fromguid && !(flags & DRR_FLAG_CLONE))
return (ENOENT);
/* Open the parent of tofs */
cp = strrchr(tofs, '/');
*cp = '\0';
err = dsl_dataset_hold(tofs, FTAG, &ds);
*cp = '/';
if (err)
return (err);
if (dmu_recv_verify_features(ds, drrb)) {
dsl_dataset_rele(ds, FTAG);
return (ENOTSUP);
}
err = dsl_sync_task_do(ds->ds_dir->dd_pool,
recv_new_check, recv_new_sync, ds->ds_dir, &rbsa, 5);
dsl_dataset_rele(ds, FTAG);
if (err)
return (err);
drc->drc_logical_ds = drc->drc_real_ds = rbsa.ds;
drc->drc_newfs = B_TRUE;
}
return (err);
}
struct restorearg {
int err;
int byteswap;
vnode_t *vp;
char *buf;
uint64_t voff;
int bufsize; /* amount of memory allocated for buf */
zio_cksum_t cksum;
avl_tree_t *guid_to_ds_map;
};
typedef struct guid_map_entry {
uint64_t guid;
dsl_dataset_t *gme_ds;
avl_node_t avlnode;
} guid_map_entry_t;
static int
guid_compare(const void *arg1, const void *arg2)
{
const guid_map_entry_t *gmep1 = arg1;
const guid_map_entry_t *gmep2 = arg2;
if (gmep1->guid < gmep2->guid)
return (-1);
else if (gmep1->guid > gmep2->guid)
return (1);
return (0);
}
static void
free_guid_map_onexit(void *arg)
{
avl_tree_t *ca = arg;
void *cookie = NULL;
guid_map_entry_t *gmep;
while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) {
dsl_dataset_rele(gmep->gme_ds, ca);
kmem_free(gmep, sizeof (guid_map_entry_t));
}
avl_destroy(ca);
kmem_free(ca, sizeof (avl_tree_t));
}
static void *
restore_read(struct restorearg *ra, int len)
{
void *rv;
int done = 0;
/* some things will require 8-byte alignment, so everything must */
ASSERT0(len % 8);
while (done < len) {
ssize_t resid;
ra->err = vn_rdwr(UIO_READ, ra->vp,
(caddr_t)ra->buf + done, len - done,
ra->voff, UIO_SYSSPACE, FAPPEND,
RLIM64_INFINITY, CRED(), &resid);
if (resid == len - done)
ra->err = EINVAL;
ra->voff += len - done - resid;
done = len - resid;
if (ra->err)
return (NULL);
}
ASSERT3U(done, ==, len);
rv = ra->buf;
if (ra->byteswap)
fletcher_4_incremental_byteswap(rv, len, &ra->cksum);
else
fletcher_4_incremental_native(rv, len, &ra->cksum);
return (rv);
}
noinline static void
backup_byteswap(dmu_replay_record_t *drr)
{
#define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X))
#define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X))
drr->drr_type = BSWAP_32(drr->drr_type);
drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen);
switch (drr->drr_type) {
case DRR_BEGIN:
DO64(drr_begin.drr_magic);
DO64(drr_begin.drr_versioninfo);
DO64(drr_begin.drr_creation_time);
DO32(drr_begin.drr_type);
DO32(drr_begin.drr_flags);
DO64(drr_begin.drr_toguid);
DO64(drr_begin.drr_fromguid);
break;
case DRR_OBJECT:
DO64(drr_object.drr_object);
/* DO64(drr_object.drr_allocation_txg); */
DO32(drr_object.drr_type);
DO32(drr_object.drr_bonustype);
DO32(drr_object.drr_blksz);
DO32(drr_object.drr_bonuslen);
DO64(drr_object.drr_toguid);
break;
case DRR_FREEOBJECTS:
DO64(drr_freeobjects.drr_firstobj);
DO64(drr_freeobjects.drr_numobjs);
DO64(drr_freeobjects.drr_toguid);
break;
case DRR_WRITE:
DO64(drr_write.drr_object);
DO32(drr_write.drr_type);
DO64(drr_write.drr_offset);
DO64(drr_write.drr_length);
DO64(drr_write.drr_toguid);
DO64(drr_write.drr_key.ddk_cksum.zc_word[0]);
DO64(drr_write.drr_key.ddk_cksum.zc_word[1]);
DO64(drr_write.drr_key.ddk_cksum.zc_word[2]);
DO64(drr_write.drr_key.ddk_cksum.zc_word[3]);
DO64(drr_write.drr_key.ddk_prop);
break;
case DRR_WRITE_BYREF:
DO64(drr_write_byref.drr_object);
DO64(drr_write_byref.drr_offset);
DO64(drr_write_byref.drr_length);
DO64(drr_write_byref.drr_toguid);
DO64(drr_write_byref.drr_refguid);
DO64(drr_write_byref.drr_refobject);
DO64(drr_write_byref.drr_refoffset);
DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[0]);
DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[1]);
DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[2]);
DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[3]);
DO64(drr_write_byref.drr_key.ddk_prop);
break;
case DRR_FREE:
DO64(drr_free.drr_object);
DO64(drr_free.drr_offset);
DO64(drr_free.drr_length);
DO64(drr_free.drr_toguid);
break;
case DRR_SPILL:
DO64(drr_spill.drr_object);
DO64(drr_spill.drr_length);
DO64(drr_spill.drr_toguid);
break;
case DRR_END:
DO64(drr_end.drr_checksum.zc_word[0]);
DO64(drr_end.drr_checksum.zc_word[1]);
DO64(drr_end.drr_checksum.zc_word[2]);
DO64(drr_end.drr_checksum.zc_word[3]);
DO64(drr_end.drr_toguid);
break;
default:
break;
}
#undef DO64
#undef DO32
}
noinline static int
restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro)
{
int err;
dmu_tx_t *tx;
void *data = NULL;
if (drro->drr_type == DMU_OT_NONE ||
!DMU_OT_IS_VALID(drro->drr_type) ||
!DMU_OT_IS_VALID(drro->drr_bonustype) ||
drro->drr_checksumtype >= ZIO_CHECKSUM_FUNCTIONS ||
drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS ||
P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) ||
drro->drr_blksz < SPA_MINBLOCKSIZE ||
drro->drr_blksz > SPA_MAXBLOCKSIZE ||
drro->drr_bonuslen > DN_MAX_BONUSLEN) {
return (EINVAL);
}
err = dmu_object_info(os, drro->drr_object, NULL);
if (err != 0 && err != ENOENT)
return (EINVAL);
if (drro->drr_bonuslen) {
data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8));
if (ra->err)
return (ra->err);
}
if (err == ENOENT) {
/* currently free, want to be allocated */
tx = dmu_tx_create(os);
dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT);
err = dmu_tx_assign(tx, TXG_WAIT);
if (err) {
dmu_tx_abort(tx);
return (err);
}
err = dmu_object_claim(os, drro->drr_object,
drro->drr_type, drro->drr_blksz,
drro->drr_bonustype, drro->drr_bonuslen, tx);
dmu_tx_commit(tx);
} else {
/* currently allocated, want to be allocated */
err = dmu_object_reclaim(os, drro->drr_object,
drro->drr_type, drro->drr_blksz,
drro->drr_bonustype, drro->drr_bonuslen);
}
if (err) {
return (EINVAL);
}
tx = dmu_tx_create(os);
dmu_tx_hold_bonus(tx, drro->drr_object);
err = dmu_tx_assign(tx, TXG_WAIT);
if (err) {
dmu_tx_abort(tx);
return (err);
}
dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksumtype,
tx);
dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx);
if (data != NULL) {
dmu_buf_t *db;
VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db));
dmu_buf_will_dirty(db, tx);
ASSERT3U(db->db_size, >=, drro->drr_bonuslen);
bcopy(data, db->db_data, drro->drr_bonuslen);
if (ra->byteswap) {
dmu_object_byteswap_t byteswap =
DMU_OT_BYTESWAP(drro->drr_bonustype);
dmu_ot_byteswap[byteswap].ob_func(db->db_data,
drro->drr_bonuslen);
}
dmu_buf_rele(db, FTAG);
}
dmu_tx_commit(tx);
return (0);
}
/* ARGSUSED */
noinline static int
restore_freeobjects(struct restorearg *ra, objset_t *os,
struct drr_freeobjects *drrfo)
{
uint64_t obj;
if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj)
return (EINVAL);
for (obj = drrfo->drr_firstobj;
obj < drrfo->drr_firstobj + drrfo->drr_numobjs;
(void) dmu_object_next(os, &obj, FALSE, 0)) {
int err;
if (dmu_object_info(os, obj, NULL) != 0)
continue;
err = dmu_free_object(os, obj);
if (err)
return (err);
}
return (0);
}
noinline static int
restore_write(struct restorearg *ra, objset_t *os,
struct drr_write *drrw)
{
dmu_tx_t *tx;
void *data;
int err;
if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset ||
!DMU_OT_IS_VALID(drrw->drr_type))
return (EINVAL);
data = restore_read(ra, drrw->drr_length);
if (data == NULL)
return (ra->err);
if (dmu_object_info(os, drrw->drr_object, NULL) != 0)
return (EINVAL);
tx = dmu_tx_create(os);
dmu_tx_hold_write(tx, drrw->drr_object,
drrw->drr_offset, drrw->drr_length);
err = dmu_tx_assign(tx, TXG_WAIT);
if (err) {
dmu_tx_abort(tx);
return (err);
}
if (ra->byteswap) {
dmu_object_byteswap_t byteswap =
DMU_OT_BYTESWAP(drrw->drr_type);
dmu_ot_byteswap[byteswap].ob_func(data, drrw->drr_length);
}
dmu_write(os, drrw->drr_object,
drrw->drr_offset, drrw->drr_length, data, tx);
dmu_tx_commit(tx);
return (0);
}
/*
* Handle a DRR_WRITE_BYREF record. This record is used in dedup'ed
* streams to refer to a copy of the data that is already on the
* system because it came in earlier in the stream. This function
* finds the earlier copy of the data, and uses that copy instead of
* data from the stream to fulfill this write.
*/
static int
restore_write_byref(struct restorearg *ra, objset_t *os,
struct drr_write_byref *drrwbr)
{
dmu_tx_t *tx;
int err;
guid_map_entry_t gmesrch;
guid_map_entry_t *gmep;
avl_index_t where;
objset_t *ref_os = NULL;
dmu_buf_t *dbp;
if (drrwbr->drr_offset + drrwbr->drr_length < drrwbr->drr_offset)
return (EINVAL);
/*
* If the GUID of the referenced dataset is different from the
* GUID of the target dataset, find the referenced dataset.
*/
if (drrwbr->drr_toguid != drrwbr->drr_refguid) {
gmesrch.guid = drrwbr->drr_refguid;
if ((gmep = avl_find(ra->guid_to_ds_map, &gmesrch,
&where)) == NULL) {
return (EINVAL);
}
if (dmu_objset_from_ds(gmep->gme_ds, &ref_os))
return (EINVAL);
} else {
ref_os = os;
}
err = dmu_buf_hold(ref_os, drrwbr->drr_refobject,
drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH);
if (err)
return (err);
tx = dmu_tx_create(os);
dmu_tx_hold_write(tx, drrwbr->drr_object,
drrwbr->drr_offset, drrwbr->drr_length);
err = dmu_tx_assign(tx, TXG_WAIT);
if (err) {
dmu_tx_abort(tx);
return (err);
}
dmu_write(os, drrwbr->drr_object,
drrwbr->drr_offset, drrwbr->drr_length, dbp->db_data, tx);
dmu_buf_rele(dbp, FTAG);
dmu_tx_commit(tx);
return (0);
}
static int
restore_spill(struct restorearg *ra, objset_t *os, struct drr_spill *drrs)
{
dmu_tx_t *tx;
void *data;
dmu_buf_t *db, *db_spill;
int err;
if (drrs->drr_length < SPA_MINBLOCKSIZE ||
drrs->drr_length > SPA_MAXBLOCKSIZE)
return (EINVAL);
data = restore_read(ra, drrs->drr_length);
if (data == NULL)
return (ra->err);
if (dmu_object_info(os, drrs->drr_object, NULL) != 0)
return (EINVAL);
VERIFY(0 == dmu_bonus_hold(os, drrs->drr_object, FTAG, &db));
if ((err = dmu_spill_hold_by_bonus(db, FTAG, &db_spill)) != 0) {
dmu_buf_rele(db, FTAG);
return (err);
}
tx = dmu_tx_create(os);
dmu_tx_hold_spill(tx, db->db_object);
err = dmu_tx_assign(tx, TXG_WAIT);
if (err) {
dmu_buf_rele(db, FTAG);
dmu_buf_rele(db_spill, FTAG);
dmu_tx_abort(tx);
return (err);
}
dmu_buf_will_dirty(db_spill, tx);
if (db_spill->db_size < drrs->drr_length)
VERIFY(0 == dbuf_spill_set_blksz(db_spill,
drrs->drr_length, tx));
bcopy(data, db_spill->db_data, drrs->drr_length);
dmu_buf_rele(db, FTAG);
dmu_buf_rele(db_spill, FTAG);
dmu_tx_commit(tx);
return (0);
}
/* ARGSUSED */
noinline static int
restore_free(struct restorearg *ra, objset_t *os,
struct drr_free *drrf)
{
int err;
if (drrf->drr_length != -1ULL &&
drrf->drr_offset + drrf->drr_length < drrf->drr_offset)
return (EINVAL);
if (dmu_object_info(os, drrf->drr_object, NULL) != 0)
return (EINVAL);
err = dmu_free_long_range(os, drrf->drr_object,
drrf->drr_offset, drrf->drr_length);
return (err);
}
/*
* NB: callers *must* call dmu_recv_end() if this succeeds.
*/
int
dmu_recv_stream(dmu_recv_cookie_t *drc, vnode_t *vp, offset_t *voffp,
int cleanup_fd, uint64_t *action_handlep)
{
struct restorearg ra = { 0 };
dmu_replay_record_t *drr;
objset_t *os;
zio_cksum_t pcksum;
int featureflags;
if (drc->drc_drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
ra.byteswap = TRUE;
{
/* compute checksum of drr_begin record */
dmu_replay_record_t *drr;
drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
drr->drr_type = DRR_BEGIN;
drr->drr_u.drr_begin = *drc->drc_drrb;
if (ra.byteswap) {
fletcher_4_incremental_byteswap(drr,
sizeof (dmu_replay_record_t), &ra.cksum);
} else {
fletcher_4_incremental_native(drr,
sizeof (dmu_replay_record_t), &ra.cksum);
}
kmem_free(drr, sizeof (dmu_replay_record_t));
}
if (ra.byteswap) {
struct drr_begin *drrb = drc->drc_drrb;
drrb->drr_magic = BSWAP_64(drrb->drr_magic);
drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo);
drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
drrb->drr_type = BSWAP_32(drrb->drr_type);
drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
}
ra.vp = vp;
ra.voff = *voffp;
ra.bufsize = 1<<20;
ra.buf = vmem_alloc(ra.bufsize, KM_SLEEP);
/* these were verified in dmu_recv_begin */
ASSERT(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo) ==
DMU_SUBSTREAM);
ASSERT(drc->drc_drrb->drr_type < DMU_OST_NUMTYPES);
/*
* Open the objset we are modifying.
*/
VERIFY(dmu_objset_from_ds(drc->drc_real_ds, &os) == 0);
ASSERT(drc->drc_real_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT);
featureflags = DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo);
/* if this stream is dedup'ed, set up the avl tree for guid mapping */
if (featureflags & DMU_BACKUP_FEATURE_DEDUP) {
minor_t minor;
if (cleanup_fd == -1) {
ra.err = EBADF;
goto out;
}
ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor);
if (ra.err) {
cleanup_fd = -1;
goto out;
}
if (*action_handlep == 0) {
ra.guid_to_ds_map =
kmem_alloc(sizeof (avl_tree_t), KM_SLEEP);
avl_create(ra.guid_to_ds_map, guid_compare,
sizeof (guid_map_entry_t),
offsetof(guid_map_entry_t, avlnode));
ra.err = zfs_onexit_add_cb(minor,
free_guid_map_onexit, ra.guid_to_ds_map,
action_handlep);
if (ra.err)
goto out;
} else {
ra.err = zfs_onexit_cb_data(minor, *action_handlep,
(void **)&ra.guid_to_ds_map);
if (ra.err)
goto out;
}
drc->drc_guid_to_ds_map = ra.guid_to_ds_map;
}
/*
* Read records and process them.
*/
pcksum = ra.cksum;
while (ra.err == 0 &&
NULL != (drr = restore_read(&ra, sizeof (*drr)))) {
if (issig(JUSTLOOKING) && issig(FORREAL)) {
ra.err = EINTR;
goto out;
}
if (ra.byteswap)
backup_byteswap(drr);
switch (drr->drr_type) {
case DRR_OBJECT:
{
/*
* We need to make a copy of the record header,
* because restore_{object,write} may need to
* restore_read(), which will invalidate drr.
*/
struct drr_object drro = drr->drr_u.drr_object;
ra.err = restore_object(&ra, os, &drro);
break;
}
case DRR_FREEOBJECTS:
{
struct drr_freeobjects drrfo =
drr->drr_u.drr_freeobjects;
ra.err = restore_freeobjects(&ra, os, &drrfo);
break;
}
case DRR_WRITE:
{
struct drr_write drrw = drr->drr_u.drr_write;
ra.err = restore_write(&ra, os, &drrw);
break;
}
case DRR_WRITE_BYREF:
{
struct drr_write_byref drrwbr =
drr->drr_u.drr_write_byref;
ra.err = restore_write_byref(&ra, os, &drrwbr);
break;
}
case DRR_FREE:
{
struct drr_free drrf = drr->drr_u.drr_free;
ra.err = restore_free(&ra, os, &drrf);
break;
}
case DRR_END:
{
struct drr_end drre = drr->drr_u.drr_end;
/*
* We compare against the *previous* checksum
* value, because the stored checksum is of
* everything before the DRR_END record.
*/
if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum))
ra.err = ECKSUM;
goto out;
}
case DRR_SPILL:
{
struct drr_spill drrs = drr->drr_u.drr_spill;
ra.err = restore_spill(&ra, os, &drrs);
break;
}
default:
ra.err = EINVAL;
goto out;
}
pcksum = ra.cksum;
}
ASSERT(ra.err != 0);
out:
if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1))
zfs_onexit_fd_rele(cleanup_fd);
if (ra.err != 0) {
/*
* destroy what we created, so we don't leave it in the
* inconsistent restoring state.
*/
txg_wait_synced(drc->drc_real_ds->ds_dir->dd_pool, 0);
(void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag,
B_FALSE);
if (drc->drc_real_ds != drc->drc_logical_ds) {
mutex_exit(&drc->drc_logical_ds->ds_recvlock);
dsl_dataset_rele(drc->drc_logical_ds, dmu_recv_tag);
}
}
vmem_free(ra.buf, ra.bufsize);
*voffp = ra.voff;
return (ra.err);
}
struct recvendsyncarg {
char *tosnap;
uint64_t creation_time;
uint64_t toguid;
};
static int
recv_end_check(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
struct recvendsyncarg *resa = arg2;
return (dsl_dataset_snapshot_check(ds, resa->tosnap, tx));
}
static void
recv_end_sync(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
struct recvendsyncarg *resa = arg2;
dsl_dataset_snapshot_sync(ds, resa->tosnap, tx);
/* set snapshot's creation time and guid */
dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
ds->ds_prev->ds_phys->ds_creation_time = resa->creation_time;
ds->ds_prev->ds_phys->ds_guid = resa->toguid;
ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
dmu_buf_will_dirty(ds->ds_dbuf, tx);
ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
}
static int
add_ds_to_guidmap(avl_tree_t *guid_map, dsl_dataset_t *ds)
{
dsl_pool_t *dp = ds->ds_dir->dd_pool;
uint64_t snapobj = ds->ds_phys->ds_prev_snap_obj;
dsl_dataset_t *snapds;
guid_map_entry_t *gmep;
int err;
ASSERT(guid_map != NULL);
rw_enter(&dp->dp_config_rwlock, RW_READER);
err = dsl_dataset_hold_obj(dp, snapobj, guid_map, &snapds);
if (err == 0) {
gmep = kmem_alloc(sizeof (guid_map_entry_t), KM_SLEEP);
gmep->guid = snapds->ds_phys->ds_guid;
gmep->gme_ds = snapds;
avl_add(guid_map, gmep);
}
rw_exit(&dp->dp_config_rwlock);
return (err);
}
static int
dmu_recv_existing_end(dmu_recv_cookie_t *drc)
{
struct recvendsyncarg resa;
dsl_dataset_t *ds = drc->drc_logical_ds;
int err, myerr;
if (dsl_dataset_tryown(ds, FALSE, dmu_recv_tag)) {
err = dsl_dataset_clone_swap(drc->drc_real_ds, ds,
drc->drc_force);
if (err)
goto out;
} else {
mutex_exit(&ds->ds_recvlock);
dsl_dataset_rele(ds, dmu_recv_tag);
(void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag,
B_FALSE);
return (EBUSY);
}
resa.creation_time = drc->drc_drrb->drr_creation_time;
resa.toguid = drc->drc_drrb->drr_toguid;
resa.tosnap = drc->drc_tosnap;
err = dsl_sync_task_do(ds->ds_dir->dd_pool,
recv_end_check, recv_end_sync, ds, &resa, 3);
if (err) {
/* swap back */
(void) dsl_dataset_clone_swap(drc->drc_real_ds, ds, B_TRUE);
}
out:
mutex_exit(&ds->ds_recvlock);
if (err == 0 && drc->drc_guid_to_ds_map != NULL)
(void) add_ds_to_guidmap(drc->drc_guid_to_ds_map, ds);
dsl_dataset_disown(ds, dmu_recv_tag);
myerr = dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag, B_FALSE);
ASSERT0(myerr);
return (err);
}
static int
dmu_recv_new_end(dmu_recv_cookie_t *drc)
{
struct recvendsyncarg resa;
dsl_dataset_t *ds = drc->drc_logical_ds;
int err;
/*
* XXX hack; seems the ds is still dirty and dsl_pool_zil_clean()
* expects it to have a ds_user_ptr (and zil), but clone_swap()
* can close it.
*/
txg_wait_synced(ds->ds_dir->dd_pool, 0);
resa.creation_time = drc->drc_drrb->drr_creation_time;
resa.toguid = drc->drc_drrb->drr_toguid;
resa.tosnap = drc->drc_tosnap;
err = dsl_sync_task_do(ds->ds_dir->dd_pool,
recv_end_check, recv_end_sync, ds, &resa, 3);
if (err) {
/* clean up the fs we just recv'd into */
(void) dsl_dataset_destroy(ds, dmu_recv_tag, B_FALSE);
} else {
if (drc->drc_guid_to_ds_map != NULL)
(void) add_ds_to_guidmap(drc->drc_guid_to_ds_map, ds);
/* release the hold from dmu_recv_begin */
dsl_dataset_disown(ds, dmu_recv_tag);
}
return (err);
}
int
dmu_recv_end(dmu_recv_cookie_t *drc)
{
if (drc->drc_logical_ds != drc->drc_real_ds)
return (dmu_recv_existing_end(drc));
else
return (dmu_recv_new_end(drc));
}
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