dmu_send.c revision 2bf405a25eb25f79638fc951ff8d8857ad384417
/*
* 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 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#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>
static char *dmu_recv_tag = "dmu_recv_tag";
struct backuparg {
dmu_replay_record_t *drr;
vnode_t *vp;
offset_t *off;
objset_t *os;
zio_cksum_t zc;
int err;
};
static int
dump_bytes(struct backuparg *ba, void *buf, int len)
{
ssize_t resid; /* have to get resid to get detailed errno */
ASSERT3U(len % 8, ==, 0);
fletcher_4_incremental_native(buf, len, &ba->zc);
ba->err = vn_rdwr(UIO_WRITE, ba->vp,
(caddr_t)buf, len,
0, UIO_SYSSPACE, FAPPEND, RLIM64_INFINITY, CRED(), &resid);
*ba->off += len;
return (ba->err);
}
static int
dump_free(struct backuparg *ba, uint64_t object, uint64_t offset,
uint64_t length)
{
/* write a FREE record */
bzero(ba->drr, sizeof (dmu_replay_record_t));
ba->drr->drr_type = DRR_FREE;
ba->drr->drr_u.drr_free.drr_object = object;
ba->drr->drr_u.drr_free.drr_offset = offset;
ba->drr->drr_u.drr_free.drr_length = length;
if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)))
return (EINTR);
return (0);
}
static int
dump_data(struct backuparg *ba, dmu_object_type_t type,
uint64_t object, uint64_t offset, int blksz, void *data)
{
/* write a DATA record */
bzero(ba->drr, sizeof (dmu_replay_record_t));
ba->drr->drr_type = DRR_WRITE;
ba->drr->drr_u.drr_write.drr_object = object;
ba->drr->drr_u.drr_write.drr_type = type;
ba->drr->drr_u.drr_write.drr_offset = offset;
ba->drr->drr_u.drr_write.drr_length = blksz;
if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)))
return (EINTR);
if (dump_bytes(ba, data, blksz))
return (EINTR);
return (0);
}
static int
dump_freeobjects(struct backuparg *ba, uint64_t firstobj, uint64_t numobjs)
{
/* write a FREEOBJECTS record */
bzero(ba->drr, sizeof (dmu_replay_record_t));
ba->drr->drr_type = DRR_FREEOBJECTS;
ba->drr->drr_u.drr_freeobjects.drr_firstobj = firstobj;
ba->drr->drr_u.drr_freeobjects.drr_numobjs = numobjs;
if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)))
return (EINTR);
return (0);
}
static int
dump_dnode(struct backuparg *ba, uint64_t object, dnode_phys_t *dnp)
{
if (dnp == NULL || dnp->dn_type == DMU_OT_NONE)
return (dump_freeobjects(ba, object, 1));
/* write an OBJECT record */
bzero(ba->drr, sizeof (dmu_replay_record_t));
ba->drr->drr_type = DRR_OBJECT;
ba->drr->drr_u.drr_object.drr_object = object;
ba->drr->drr_u.drr_object.drr_type = dnp->dn_type;
ba->drr->drr_u.drr_object.drr_bonustype = dnp->dn_bonustype;
ba->drr->drr_u.drr_object.drr_blksz =
dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
ba->drr->drr_u.drr_object.drr_bonuslen = dnp->dn_bonuslen;
ba->drr->drr_u.drr_object.drr_checksum = dnp->dn_checksum;
ba->drr->drr_u.drr_object.drr_compress = dnp->dn_compress;
if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)))
return (EINTR);
if (dump_bytes(ba, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)))
return (EINTR);
/* free anything past the end of the file */
if (dump_free(ba, object, (dnp->dn_maxblkid + 1) *
(dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL))
return (EINTR);
if (ba->err)
return (EINTR);
return (0);
}
#define BP_SPAN(dnp, level) \
(((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \
(level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)))
static int
backup_cb(spa_t *spa, blkptr_t *bp, const zbookmark_t *zb,
const dnode_phys_t *dnp, void *arg)
{
struct backuparg *ba = 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 (bp == NULL && zb->zb_object == 0) {
uint64_t span = BP_SPAN(dnp, zb->zb_level);
uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
err = dump_freeobjects(ba, dnobj, span >> DNODE_SHIFT);
} else if (bp == NULL) {
uint64_t span = BP_SPAN(dnp, zb->zb_level);
err = dump_free(ba, 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_nolock(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(ba, dnobj, blk+i);
if (err)
break;
}
(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_nolock(NULL, spa, bp,
arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ,
ZIO_FLAG_CANFAIL, &aflags, zb) != 0)
return (EIO);
err = dump_data(ba, type, zb->zb_object, zb->zb_blkid * blksz,
blksz, abuf->b_data);
(void) arc_buf_remove_ref(abuf, &abuf);
}
ASSERT(err == 0 || err == EINTR);
return (err);
}
int
dmu_sendbackup(objset_t *tosnap, objset_t *fromsnap, boolean_t fromorigin,
vnode_t *vp, offset_t *off)
{
dsl_dataset_t *ds = tosnap->os->os_dsl_dataset;
dsl_dataset_t *fromds = fromsnap ? fromsnap->os->os_dsl_dataset : NULL;
dmu_replay_record_t *drr;
struct backuparg ba;
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;
drr->drr_u.drr_begin.drr_version = DMU_BACKUP_STREAM_VERSION;
drr->drr_u.drr_begin.drr_creation_time =
ds->ds_phys->ds_creation_time;
drr->drr_u.drr_begin.drr_type = tosnap->os->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);
ba.drr = drr;
ba.vp = vp;
ba.os = tosnap;
ba.off = off;
ZIO_SET_CHECKSUM(&ba.zc, 0, 0, 0, 0);
if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t))) {
kmem_free(drr, sizeof (dmu_replay_record_t));
return (ba.err);
}
err = traverse_dataset(ds, fromtxg, TRAVERSE_PRE | TRAVERSE_PREFETCH,
backup_cb, &ba);
if (err) {
if (err == EINTR && ba.err)
err = ba.err;
kmem_free(drr, sizeof (dmu_replay_record_t));
return (err);
}
bzero(drr, sizeof (dmu_replay_record_t));
drr->drr_type = DRR_END;
drr->drr_u.drr_end.drr_checksum = ba.zc;
if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t))) {
kmem_free(drr, sizeof (dmu_replay_record_t));
return (ba.err);
}
kmem_free(drr, sizeof (dmu_replay_record_t));
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 */
};
static dsl_dataset_t *
recv_full_sync_impl(dsl_pool_t *dp, uint64_t dsobj, dmu_objset_type_t type,
cred_t *cr, dmu_tx_t *tx)
{
dsl_dataset_t *ds;
/* This should always work, since we just created it */
/* XXX - create should return an owned ds */
VERIFY(0 == dsl_dataset_own_obj(dp, dsobj,
DS_MODE_INCONSISTENT, dmu_recv_tag, &ds));
if (type != DMU_OST_NONE) {
(void) dmu_objset_create_impl(dp->dp_spa,
ds, &ds->ds_phys->ds_bp, type, tx);
}
spa_history_internal_log(LOG_DS_REPLAY_FULL_SYNC,
dp->dp_spa, tx, cr, "dataset = %lld", dsobj);
return (ds);
}
/* ARGSUSED */
static int
recv_full_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 (rbsa->origin->ds_phys->ds_num_children == 0)
return (EINVAL);
if (rbsa->origin->ds_phys->ds_guid != rbsa->fromguid)
return (ENODEV);
}
return (0);
}
static void
recv_full_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx)
{
dsl_dir_t *dd = arg1;
struct recvbeginsyncarg *rbsa = arg2;
uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
uint64_t dsobj;
dsobj = dsl_dataset_create_sync(dd, strrchr(rbsa->tofs, '/') + 1,
rbsa->origin, flags, cr, tx);
rbsa->ds = recv_full_sync_impl(dd->dd_pool, dsobj,
rbsa->origin ? DMU_OST_NONE : rbsa->type, cr, tx);
}
static int
recv_full_existing_check(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
struct recvbeginsyncarg *rbsa = arg2;
int err;
/* must be a head ds */
if (ds->ds_phys->ds_next_snap_obj != 0)
return (EINVAL);
/* must not be a clone ds */
if (dsl_dir_is_clone(ds->ds_dir))
return (EINVAL);
err = dsl_dataset_destroy_check(ds, rbsa->tag, tx);
if (err)
return (err);
if (rbsa->origin) {
/* make sure it's a snap in the same pool */
if (rbsa->origin->ds_dir->dd_pool != ds->ds_dir->dd_pool)
return (EXDEV);
if (rbsa->origin->ds_phys->ds_num_children == 0)
return (EINVAL);
if (rbsa->origin->ds_phys->ds_guid != rbsa->fromguid)
return (ENODEV);
}
return (0);
}
static void
recv_full_existing_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
struct recvbeginsyncarg *rbsa = arg2;
dsl_dir_t *dd = ds->ds_dir;
uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
uint64_t dsobj;
/*
* NB: caller must provide an extra hold on the dsl_dir_t, so it
* won't go away when dsl_dataset_destroy_sync() closes the
* dataset.
*/
dsl_dataset_destroy_sync(ds, rbsa->tag, cr, tx);
dsobj = dsl_dataset_create_sync_dd(dd, rbsa->origin, flags, tx);
rbsa->ds = recv_full_sync_impl(dd->dd_pool, dsobj,
rbsa->origin ? DMU_OST_NONE : rbsa->type, cr, tx);
}
/* ARGSUSED */
static int
recv_incremental_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);
/* must already be a snapshot of this fs */
if (ds->ds_phys->ds_prev_snap_obj == 0)
return (ENODEV);
/* most recent snapshot must match fromguid */
if (ds->ds_prev->ds_phys->ds_guid != rbsa->fromguid)
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);
/* 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);
return (0);
}
/* ARGSUSED */
static void
recv_online_incremental_sync(void *arg1, void *arg2, cred_t *cr, 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 *ods, *cds;
uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
uint64_t dsobj;
/* create the temporary clone */
VERIFY(0 == dsl_dataset_hold_obj(dp, ohds->ds_phys->ds_prev_snap_obj,
FTAG, &ods));
dsobj = dsl_dataset_create_sync(ohds->ds_dir,
rbsa->clonelastname, ods, flags, cr, tx);
dsl_dataset_rele(ods, FTAG);
/* open the temporary clone */
VERIFY(0 == dsl_dataset_own_obj(dp, dsobj,
DS_MODE_INCONSISTENT, dmu_recv_tag, &cds));
/* copy the refquota from the target fs to the clone */
if (ohds->ds_quota > 0)
dsl_dataset_set_quota_sync(cds, &ohds->ds_quota, cr, tx);
rbsa->ds = cds;
spa_history_internal_log(LOG_DS_REPLAY_INC_SYNC,
dp->dp_spa, tx, cr, "dataset = %lld", dsobj);
}
/* ARGSUSED */
static void
recv_offline_incremental_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
dmu_buf_will_dirty(ds->ds_dbuf, tx);
ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT;
spa_history_internal_log(LOG_DS_REPLAY_INC_SYNC,
ds->ds_dir->dd_pool->dp_spa, tx, cr, "dataset = %lld",
ds->ds_object);
}
/*
* 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, struct drr_begin *drrb,
boolean_t force, objset_t *origin, boolean_t online, dmu_recv_cookie_t *drc)
{
int err = 0;
boolean_t byteswap;
struct recvbeginsyncarg rbsa;
uint64_t version;
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->os_dsl_dataset : NULL;
rbsa.fromguid = drrb->drr_fromguid;
rbsa.type = drrb->drr_type;
rbsa.tag = FTAG;
rbsa.dsflags = 0;
version = drrb->drr_version;
flags = drrb->drr_flags;
if (byteswap) {
rbsa.type = BSWAP_32(rbsa.type);
rbsa.fromguid = BSWAP_64(rbsa.fromguid);
version = BSWAP_64(version);
flags = BSWAP_32(flags);
}
if (version != DMU_BACKUP_STREAM_VERSION ||
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_force = force;
/*
* Process the begin in syncing context.
*/
if (rbsa.fromguid && !(flags & DRR_FLAG_CLONE) && !online) {
/* offline incremental receive */
err = dsl_dataset_own(tofs, 0, dmu_recv_tag, &ds);
if (err)
return (err);
/*
* Only do the rollback if the most recent snapshot
* matches the incremental source
*/
if (force) {
if (ds->ds_prev == NULL ||
ds->ds_prev->ds_phys->ds_guid !=
rbsa.fromguid) {
dsl_dataset_disown(ds, dmu_recv_tag);
return (ENODEV);
}
(void) dsl_dataset_rollback(ds, DMU_OST_NONE);
}
rbsa.force = B_FALSE;
err = dsl_sync_task_do(ds->ds_dir->dd_pool,
recv_incremental_check,
recv_offline_incremental_sync, ds, &rbsa, 1);
if (err) {
dsl_dataset_disown(ds, dmu_recv_tag);
return (err);
}
drc->drc_logical_ds = drc->drc_real_ds = ds;
} else if (rbsa.fromguid && !(flags & DRR_FLAG_CLONE)) {
/* online incremental receive */
/* tmp clone name is: tofs/%tosnap" */
(void) snprintf(rbsa.clonelastname, sizeof (rbsa.clonelastname),
"%%%s", tosnap);
/* open the dataset we are logically receiving into */
err = dsl_dataset_hold(tofs, dmu_recv_tag, &ds);
if (err)
return (err);
rbsa.force = force;
err = dsl_sync_task_do(ds->ds_dir->dd_pool,
recv_incremental_check,
recv_online_incremental_sync, ds, &rbsa, 5);
if (err) {
dsl_dataset_rele(ds, dmu_recv_tag);
return (err);
}
drc->drc_logical_ds = ds;
drc->drc_real_ds = rbsa.ds;
} else {
/* create new fs -- full backup or clone */
dsl_dir_t *dd = NULL;
const char *tail;
err = dsl_dir_open(tofs, FTAG, &dd, &tail);
if (err)
return (err);
if (tail == NULL) {
if (!force) {
dsl_dir_close(dd, FTAG);
return (EEXIST);
}
rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER);
err = dsl_dataset_own_obj(dd->dd_pool,
dd->dd_phys->dd_head_dataset_obj,
DS_MODE_INCONSISTENT, FTAG, &ds);
rw_exit(&dd->dd_pool->dp_config_rwlock);
if (err) {
dsl_dir_close(dd, FTAG);
return (err);
}
dsl_dataset_make_exclusive(ds, FTAG);
err = dsl_sync_task_do(dd->dd_pool,
recv_full_existing_check,
recv_full_existing_sync, ds, &rbsa, 5);
dsl_dataset_disown(ds, FTAG);
} else {
err = dsl_sync_task_do(dd->dd_pool, recv_full_check,
recv_full_sync, dd, &rbsa, 5);
}
dsl_dir_close(dd, FTAG);
if (err)
return (err);
drc->drc_logical_ds = drc->drc_real_ds = rbsa.ds;
drc->drc_newfs = B_TRUE;
}
return (0);
}
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;
};
static void *
restore_read(struct restorearg *ra, int len)
{
void *rv;
int done = 0;
/* some things will require 8-byte alignment, so everything must */
ASSERT3U(len % 8, ==, 0);
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);
}
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_version);
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);
break;
case DRR_FREEOBJECTS:
DO64(drr_freeobjects.drr_firstobj);
DO64(drr_freeobjects.drr_numobjs);
break;
case DRR_WRITE:
DO64(drr_write.drr_object);
DO32(drr_write.drr_type);
DO64(drr_write.drr_offset);
DO64(drr_write.drr_length);
break;
case DRR_FREE:
DO64(drr_free.drr_object);
DO64(drr_free.drr_offset);
DO64(drr_free.drr_length);
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]);
break;
}
#undef DO64
#undef DO32
}
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 ||
drro->drr_type >= DMU_OT_NUMTYPES ||
drro->drr_bonustype >= DMU_OT_NUMTYPES ||
drro->drr_checksum >= 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_checksum, 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_ot[drro->drr_bonustype].ot_byteswap(db->db_data,
drro->drr_bonuslen);
}
dmu_buf_rele(db, FTAG);
}
dmu_tx_commit(tx);
return (0);
}
/* ARGSUSED */
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);
}
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 ||
drrw->drr_type >= DMU_OT_NUMTYPES)
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_ot[drrw->drr_type].ot_byteswap(data, drrw->drr_length);
dmu_write(os, drrw->drr_object,
drrw->drr_offset, drrw->drr_length, data, tx);
dmu_tx_commit(tx);
return (0);
}
/* ARGSUSED */
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);
}
void
dmu_recv_abort_cleanup(dmu_recv_cookie_t *drc)
{
if (drc->drc_newfs || drc->drc_real_ds != drc->drc_logical_ds) {
/*
* online incremental or new fs: destroy the fs (which
* may be a clone) that we created
*/
(void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag);
if (drc->drc_real_ds != drc->drc_logical_ds)
dsl_dataset_rele(drc->drc_logical_ds, dmu_recv_tag);
} else {
/*
* offline incremental: rollback to most recent snapshot.
*/
(void) dsl_dataset_rollback(drc->drc_real_ds, DMU_OST_NONE);
dsl_dataset_disown(drc->drc_real_ds, dmu_recv_tag);
}
}
/*
* 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)
{
struct restorearg ra = { 0 };
dmu_replay_record_t *drr;
objset_t *os;
zio_cksum_t pcksum;
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_version = BSWAP_64(drrb->drr_version);
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 = kmem_alloc(ra.bufsize, KM_SLEEP);
/* these were verified in dmu_recv_begin */
ASSERT(drc->drc_drrb->drr_version == DMU_BACKUP_STREAM_VERSION);
ASSERT(drc->drc_drrb->drr_type < DMU_OST_NUMTYPES);
/*
* Open the objset we are modifying.
*/
VERIFY(dmu_objset_open_ds(drc->drc_real_ds, DMU_OST_ANY, &os) == 0);
ASSERT(drc->drc_real_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT);
/*
* 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_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;
}
default:
ra.err = EINVAL;
goto out;
}
pcksum = ra.cksum;
}
ASSERT(ra.err != 0);
out:
dmu_objset_close(os);
if (ra.err != 0) {
/*
* rollback or destroy what we created, so we don't
* leave it in the restoring state.
*/
txg_wait_synced(drc->drc_real_ds->ds_dir->dd_pool, 0);
dmu_recv_abort_cleanup(drc);
}
kmem_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, cred_t *cr, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
struct recvendsyncarg *resa = arg2;
dsl_dataset_snapshot_sync(ds, resa->tosnap, cr, 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;
}
int
dmu_recv_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);
if (ds != drc->drc_real_ds) {
/* we are doing an online recv */
if (dsl_dataset_tryown(ds, FALSE, dmu_recv_tag)) {
err = dsl_dataset_clone_swap(drc->drc_real_ds, ds,
drc->drc_force);
if (err)
dsl_dataset_disown(ds, dmu_recv_tag);
} else {
err = EBUSY;
dsl_dataset_rele(ds, dmu_recv_tag);
}
/* dsl_dataset_destroy() will disown the ds */
(void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag);
if (err)
return (err);
}
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) {
if (drc->drc_newfs) {
ASSERT(ds == drc->drc_real_ds);
(void) dsl_dataset_destroy(ds, dmu_recv_tag);
return (err);
} else {
(void) dsl_dataset_rollback(ds, DMU_OST_NONE);
}
}
/* release the hold from dmu_recv_begin */
dsl_dataset_disown(ds, dmu_recv_tag);
return (err);
}