/* * 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 2010 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static char *dmu_recv_tag = "dmu_recv_tag"; /* * The list of data whose inclusion in a send stream can be pending from * one call to backup_cb to another. Multiple calls to dump_free() and * dump_freeobjects() can be aggregated into a single DRR_FREE or * DRR_FREEOBJECTS replay record. */ typedef enum { PENDING_NONE, PENDING_FREE, PENDING_FREEOBJECTS } pendop_t; struct backuparg { dmu_replay_record_t *drr; vnode_t *vp; offset_t *off; objset_t *os; zio_cksum_t zc; uint64_t toguid; int err; pendop_t pending_op; }; 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) { struct drr_free *drrf = &(ba->drr->drr_u.drr_free); /* * 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 (ba->pending_op != PENDING_NONE && ba->pending_op != PENDING_FREE) { if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0) return (EINTR); ba->pending_op = PENDING_NONE; } if (ba->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(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0) return (EINTR); ba->pending_op = PENDING_NONE; } } /* create a FREE record and make it pending */ bzero(ba->drr, sizeof (dmu_replay_record_t)); ba->drr->drr_type = DRR_FREE; drrf->drr_object = object; drrf->drr_offset = offset; drrf->drr_length = length; drrf->drr_toguid = ba->toguid; if (length == -1ULL) { if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0) return (EINTR); } else { ba->pending_op = PENDING_FREE; } return (0); } static int dump_data(struct backuparg *ba, dmu_object_type_t type, uint64_t object, uint64_t offset, int blksz, const blkptr_t *bp, void *data) { struct drr_write *drrw = &(ba->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 (ba->pending_op != PENDING_NONE) { if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0) return (EINTR); ba->pending_op = PENDING_NONE; } /* write a DATA record */ bzero(ba->drr, sizeof (dmu_replay_record_t)); ba->drr->drr_type = DRR_WRITE; drrw->drr_object = object; drrw->drr_type = type; drrw->drr_offset = offset; drrw->drr_length = blksz; drrw->drr_toguid = ba->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(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0) return (EINTR); if (dump_bytes(ba, data, blksz) != 0) return (EINTR); return (0); } static int dump_spill(struct backuparg *ba, uint64_t object, int blksz, void *data) { struct drr_spill *drrs = &(ba->drr->drr_u.drr_spill); if (ba->pending_op != PENDING_NONE) { if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0) return (EINTR); ba->pending_op = PENDING_NONE; } /* write a SPILL record */ bzero(ba->drr, sizeof (dmu_replay_record_t)); ba->drr->drr_type = DRR_SPILL; drrs->drr_object = object; drrs->drr_length = blksz; drrs->drr_toguid = ba->toguid; 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) { struct drr_freeobjects *drrfo = &(ba->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 (ba->pending_op != PENDING_NONE && ba->pending_op != PENDING_FREEOBJECTS) { if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0) return (EINTR); ba->pending_op = PENDING_NONE; } if (ba->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(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0) return (EINTR); ba->pending_op = PENDING_NONE; } } /* write a FREEOBJECTS record */ bzero(ba->drr, sizeof (dmu_replay_record_t)); ba->drr->drr_type = DRR_FREEOBJECTS; drrfo->drr_firstobj = firstobj; drrfo->drr_numobjs = numobjs; drrfo->drr_toguid = ba->toguid; ba->pending_op = PENDING_FREEOBJECTS; return (0); } static int dump_dnode(struct backuparg *ba, uint64_t object, dnode_phys_t *dnp) { struct drr_object *drro = &(ba->drr->drr_u.drr_object); if (dnp == NULL || dnp->dn_type == DMU_OT_NONE) return (dump_freeobjects(ba, object, 1)); if (ba->pending_op != PENDING_NONE) { if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0) return (EINTR); ba->pending_op = PENDING_NONE; } /* write an OBJECT record */ bzero(ba->drr, sizeof (dmu_replay_record_t)); ba->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 = ba->toguid; if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0) return (EINTR); if (dump_bytes(ba, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)) != 0) 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))) /* 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) { 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 (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(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 if (type == DMU_OT_SA) { 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_spill(ba, 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_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, bp, 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_dsl_dataset; dsl_dataset_t *fromds = fromsnap ? fromsnap->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; DMU_SET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo, DMU_SUBSTREAM); 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); ba.drr = drr; ba.vp = vp; ba.os = tosnap; ba.off = off; ba.toguid = ds->ds_phys->ds_guid; ZIO_SET_CHECKSUM(&ba.zc, 0, 0, 0, 0); ba.pending_op = PENDING_NONE; if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t)) != 0) { kmem_free(drr, sizeof (dmu_replay_record_t)); return (ba.err); } err = traverse_dataset(ds, fromtxg, TRAVERSE_PRE | TRAVERSE_PREFETCH, backup_cb, &ba); if (ba.pending_op != PENDING_NONE) if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t)) != 0) err = EINTR; 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; drr->drr_u.drr_end.drr_toguid = ba.toguid; if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t)) != 0) { 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 */ }; /* 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, 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; /* Create and open new dataset. */ dsobj = dsl_dataset_create_sync(dd, strrchr(rbsa->tofs, '/') + 1, rbsa->origin, flags, 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_internal_log(LOG_DS_REPLAY_FULL_SYNC, dd->dd_pool->dp_spa, tx, cr, "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); 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); /* 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_existing_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 *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, 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_internal_log(LOG_DS_REPLAY_INC_SYNC, dp->dp_spa, tx, cr, "dataset = %lld", dsobj); } /* * 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; 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) { /* 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); 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); } /* * This function is a callback used by dmu_objset_find() (which * enumerates the object sets) to build an avl tree that maps guids * to datasets. The resulting table is used when processing DRR_WRITE_BYREF * send stream records. These records, which are used in dedup'ed * streams, do not contain data themselves, but refer to a copy * of the data block that has already been written because it was * earlier in the stream. That previous copy is identified by the * guid of the dataset with the referenced data. */ int find_ds_by_guid(const char *name, void *arg) { avl_tree_t *guid_map = arg; dsl_dataset_t *ds, *snapds; guid_map_entry_t *gmep; dsl_pool_t *dp; int err; uint64_t lastobj, firstobj; if (dsl_dataset_hold(name, FTAG, &ds) != 0) return (0); dp = ds->ds_dir->dd_pool; rw_enter(&dp->dp_config_rwlock, RW_READER); firstobj = ds->ds_dir->dd_phys->dd_origin_obj; lastobj = ds->ds_phys->ds_prev_snap_obj; while (lastobj != firstobj) { err = dsl_dataset_hold_obj(dp, lastobj, guid_map, &snapds); if (err) { /* * Skip this snapshot and move on. It's not * clear why this would ever happen, but the * remainder of the snapshot streadm can be * processed. */ rw_exit(&dp->dp_config_rwlock); dsl_dataset_rele(ds, FTAG); return (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); lastobj = snapds->ds_phys->ds_prev_snap_obj; } rw_exit(&dp->dp_config_rwlock); dsl_dataset_rele(ds, FTAG); return (0); } 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_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; } #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_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_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); } /* * 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; } if (err = dmu_buf_hold(ref_os, drrwbr->drr_refobject, drrwbr->drr_refoffset, FTAG, &dbp)) 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 */ 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) { struct restorearg ra = { 0 }; dmu_replay_record_t *drr; objset_t *os; zio_cksum_t pcksum; guid_map_entry_t *gmep; 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 = kmem_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) { avl_create(&ra.guid_to_ds_map, guid_compare, sizeof (guid_map_entry_t), offsetof(guid_map_entry_t, avlnode)); (void) dmu_objset_find(drc->drc_top_ds, find_ds_by_guid, (void *)&ra.guid_to_ds_map, DS_FIND_CHILDREN); } /* * 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 (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); } } if (featureflags & DMU_BACKUP_FEATURE_DEDUP) { void *cookie = NULL; while (gmep = avl_destroy_nodes(&ra.guid_to_ds_map, &cookie)) { dsl_dataset_rele(gmep->gme_ds, &ra.guid_to_ds_map); kmem_free(gmep, sizeof (guid_map_entry_t)); } avl_destroy(&ra.guid_to_ds_map); } 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; } static int dmu_recv_existing_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 (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); dsl_dataset_disown(ds, dmu_recv_tag); (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag, B_FALSE); 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 { /* 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)); }