diff options
Diffstat (limited to 'sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_send.c')
| -rw-r--r-- | sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_send.c | 2129 |
1 files changed, 2129 insertions, 0 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_send.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_send.c new file mode 100644 index 0000000..1b246c8 --- /dev/null +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_send.c @@ -0,0 +1,2129 @@ +/* + * 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 2011 Nexenta Systems, Inc. All rights reserved. + * Copyright (c) 2013 by Delphix. All rights reserved. + * Copyright (c) 2014, Joyent, Inc. All rights reserved. + * Copyright (c) 2012, Martin Matuska <mm@FreeBSD.org>. 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/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> +#include <sys/dmu_send.h> +#include <sys/dsl_destroy.h> +#include <sys/blkptr.h> +#include <sys/dsl_bookmark.h> +#include <sys/zfeature.h> + +#ifdef __FreeBSD__ +#undef dump_write +#define dump_write dmu_dump_write +#endif + +/* 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"; +static const char *recv_clone_name = "%recv"; + +static int +dump_bytes(dmu_sendarg_t *dsp, void *buf, int len) +{ + dsl_dataset_t *ds = dsp->dsa_os->os_dsl_dataset; + struct uio auio; + struct iovec aiov; + ASSERT0(len % 8); + + fletcher_4_incremental_native(buf, len, &dsp->dsa_zc); + aiov.iov_base = buf; + aiov.iov_len = len; + auio.uio_iov = &aiov; + auio.uio_iovcnt = 1; + auio.uio_resid = len; + auio.uio_segflg = UIO_SYSSPACE; + auio.uio_rw = UIO_WRITE; + auio.uio_offset = (off_t)-1; + auio.uio_td = dsp->dsa_td; +#ifdef _KERNEL + if (dsp->dsa_fp->f_type == DTYPE_VNODE) + bwillwrite(); + dsp->dsa_err = fo_write(dsp->dsa_fp, &auio, dsp->dsa_td->td_ucred, 0, + dsp->dsa_td); +#else + fprintf(stderr, "%s: returning EOPNOTSUPP\n", __func__); + dsp->dsa_err = EOPNOTSUPP; +#endif + mutex_enter(&ds->ds_sendstream_lock); + *dsp->dsa_off += len; + mutex_exit(&ds->ds_sendstream_lock); + + 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); + + /* + * When we receive a free record, dbuf_free_range() assumes + * that the receiving system doesn't have any dbufs in the range + * being freed. This is always true because there is a one-record + * constraint: we only send one WRITE record for any given + * object+offset. We know that the one-record constraint is + * true because we always send data in increasing order by + * object,offset. + * + * If the increasing-order constraint ever changes, we should find + * another way to assert that the one-record constraint is still + * satisfied. + */ + ASSERT(object > dsp->dsa_last_data_object || + (object == dsp->dsa_last_data_object && + offset > dsp->dsa_last_data_offset)); + + /* + * If we are doing a non-incremental send, then there can't + * be any data in the dataset we're receiving into. Therefore + * a free record would simply be a no-op. Save space by not + * sending it to begin with. + */ + if (!dsp->dsa_incremental) + return (0); + + 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 (SET_ERROR(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 (SET_ERROR(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 (SET_ERROR(EINTR)); + } else { + dsp->dsa_pending_op = PENDING_FREE; + } + + return (0); +} + +static int +dump_write(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); + + /* + * We send data in increasing object, offset order. + * See comment in dump_free() for details. + */ + ASSERT(object > dsp->dsa_last_data_object || + (object == dsp->dsa_last_data_object && + offset > dsp->dsa_last_data_offset)); + dsp->dsa_last_data_object = object; + dsp->dsa_last_data_offset = offset + blksz - 1; + + /* + * 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 (SET_ERROR(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; + if (BP_IS_EMBEDDED(bp)) { + /* + * There's no pre-computed checksum of embedded BP's, so + * (like fletcher4-checkummed blocks) userland will have + * to compute a dedup-capable checksum itself. + */ + drrw->drr_checksumtype = ZIO_CHECKSUM_OFF; + } else { + 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 (SET_ERROR(EINTR)); + if (dump_bytes(dsp, data, blksz) != 0) + return (SET_ERROR(EINTR)); + return (0); +} + +static int +dump_write_embedded(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset, + int blksz, const blkptr_t *bp) +{ + char buf[BPE_PAYLOAD_SIZE]; + struct drr_write_embedded *drrw = + &(dsp->dsa_drr->drr_u.drr_write_embedded); + + 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; + } + + ASSERT(BP_IS_EMBEDDED(bp)); + + bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); + dsp->dsa_drr->drr_type = DRR_WRITE_EMBEDDED; + drrw->drr_object = object; + drrw->drr_offset = offset; + drrw->drr_length = blksz; + drrw->drr_toguid = dsp->dsa_toguid; + drrw->drr_compression = BP_GET_COMPRESS(bp); + drrw->drr_etype = BPE_GET_ETYPE(bp); + drrw->drr_lsize = BPE_GET_LSIZE(bp); + drrw->drr_psize = BPE_GET_PSIZE(bp); + + decode_embedded_bp_compressed(bp, buf); + + if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0) + return (EINTR); + if (dump_bytes(dsp, buf, P2ROUNDUP(drrw->drr_psize, 8)) != 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 (SET_ERROR(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 (SET_ERROR(EINTR)); + if (dump_bytes(dsp, data, blksz)) + return (SET_ERROR(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); + + /* See comment in dump_free(). */ + if (!dsp->dsa_incremental) + return (0); + + /* + * 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 (SET_ERROR(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 (SET_ERROR(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 (SET_ERROR(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 (SET_ERROR(EINTR)); + + if (dump_bytes(dsp, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)) != 0) + return (SET_ERROR(EINTR)); + + /* Free anything past the end of the file. */ + if (dump_free(dsp, object, (dnp->dn_maxblkid + 1) * + (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL) != 0) + return (SET_ERROR(EINTR)); + if (dsp->dsa_err != 0) + return (SET_ERROR(EINTR)); + return (0); +} + +static boolean_t +backup_do_embed(dmu_sendarg_t *dsp, const blkptr_t *bp) +{ + if (!BP_IS_EMBEDDED(bp)) + return (B_FALSE); + + /* + * Compression function must be legacy, or explicitly enabled. + */ + if ((BP_GET_COMPRESS(bp) >= ZIO_COMPRESS_LEGACY_FUNCTIONS && + !(dsp->dsa_featureflags & DMU_BACKUP_FEATURE_EMBED_DATA_LZ4))) + return (B_FALSE); + + /* + * Embed type must be explicitly enabled. + */ + switch (BPE_GET_ETYPE(bp)) { + case BP_EMBEDDED_TYPE_DATA: + if (dsp->dsa_featureflags & DMU_BACKUP_FEATURE_EMBED_DATA) + return (B_TRUE); + break; + default: + return (B_FALSE); + } + return (B_FALSE); +} + +#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 (SET_ERROR(EINTR)); + + if (zb->zb_object != DMU_META_DNODE_OBJECT && + DMU_OBJECT_IS_SPECIAL(zb->zb_object)) { + return (0); + } else if (zb->zb_level == ZB_ZIL_LEVEL) { + /* + * If we are sending a non-snapshot (which is allowed on + * read-only pools), it may have a ZIL, which must be ignored. + */ + return (0); + } else if (BP_IS_HOLE(bp) && + 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_IS_HOLE(bp)) { + 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 (SET_ERROR(EIO)); + + blk = abuf->b_data; + for (i = 0; i < blksz >> DNODE_SHIFT; i++) { + uint64_t dnobj = (zb->zb_blkid << + (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i; + err = dump_dnode(dsp, dnobj, blk+i); + if (err != 0) + 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 (SET_ERROR(EIO)); + + err = dump_spill(dsp, zb->zb_object, blksz, abuf->b_data); + (void) arc_buf_remove_ref(abuf, &abuf); + } else if (backup_do_embed(dsp, bp)) { + /* it's an embedded level-0 block of a regular object */ + int blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT; + err = dump_write_embedded(dsp, zb->zb_object, + zb->zb_blkid * blksz, blksz, bp); + } 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); + + ASSERT3U(blksz, ==, dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT); + ASSERT0(zb->zb_level); + 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) { + /* Send a block filled with 0x"zfs badd bloc" */ + abuf = arc_buf_alloc(spa, blksz, &abuf, + ARC_BUFC_DATA); + uint64_t *ptr; + for (ptr = abuf->b_data; + (char *)ptr < (char *)abuf->b_data + blksz; + ptr++) + *ptr = 0x2f5baddb10c; + } else { + return (SET_ERROR(EIO)); + } + } + + err = dump_write(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); +} + +/* + * Releases dp using the specified tag. + */ +static int +dmu_send_impl(void *tag, dsl_pool_t *dp, dsl_dataset_t *ds, + zfs_bookmark_phys_t *fromzb, boolean_t is_clone, boolean_t embedok, +#ifdef illumos + int outfd, vnode_t *vp, offset_t *off) +#else + int outfd, struct file *fp, offset_t *off) +#endif +{ + objset_t *os; + dmu_replay_record_t *drr; + dmu_sendarg_t *dsp; + int err; + uint64_t fromtxg = 0; + uint64_t featureflags = 0; + + err = dmu_objset_from_ds(ds, &os); + if (err != 0) { + dsl_pool_rele(dp, tag); + return (err); + } + + 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(os) == DMU_OST_ZFS) { + uint64_t version; + if (zfs_get_zplprop(os, ZFS_PROP_VERSION, &version) != 0) { + kmem_free(drr, sizeof (dmu_replay_record_t)); + dsl_pool_rele(dp, tag); + return (SET_ERROR(EINVAL)); + } + if (version >= ZPL_VERSION_SA) { + featureflags |= DMU_BACKUP_FEATURE_SA_SPILL; + } + } +#endif + + if (embedok && + spa_feature_is_active(dp->dp_spa, SPA_FEATURE_EMBEDDED_DATA)) { + featureflags |= DMU_BACKUP_FEATURE_EMBED_DATA; + if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_LZ4_COMPRESS)) + featureflags |= DMU_BACKUP_FEATURE_EMBED_DATA_LZ4; + } else { + embedok = B_FALSE; + } + + DMU_SET_FEATUREFLAGS(drr->drr_u.drr_begin.drr_versioninfo, + featureflags); + + drr->drr_u.drr_begin.drr_creation_time = + ds->ds_phys->ds_creation_time; + drr->drr_u.drr_begin.drr_type = dmu_objset_type(os); + if (is_clone) + 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 (fromzb != NULL) { + drr->drr_u.drr_begin.drr_fromguid = fromzb->zbm_guid; + fromtxg = fromzb->zbm_creation_txg; + } + dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname); + if (!dsl_dataset_is_snapshot(ds)) { + (void) strlcat(drr->drr_u.drr_begin.drr_toname, "@--head--", + sizeof (drr->drr_u.drr_begin.drr_toname)); + } + + dsp = kmem_zalloc(sizeof (dmu_sendarg_t), KM_SLEEP); + + dsp->dsa_drr = drr; + dsp->dsa_outfd = outfd; + dsp->dsa_proc = curproc; + dsp->dsa_td = curthread; + dsp->dsa_fp = fp; + dsp->dsa_os = os; + 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; + dsp->dsa_incremental = (fromzb != NULL); + dsp->dsa_featureflags = featureflags; + + mutex_enter(&ds->ds_sendstream_lock); + list_insert_head(&ds->ds_sendstreams, dsp); + mutex_exit(&ds->ds_sendstream_lock); + + dsl_dataset_long_hold(ds, FTAG); + dsl_pool_rele(dp, tag); + + 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 = SET_ERROR(EINTR); + + if (err != 0) { + if (err == EINTR && dsp->dsa_err != 0) + 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)); + + dsl_dataset_long_rele(ds, FTAG); + + return (err); +} + +int +dmu_send_obj(const char *pool, uint64_t tosnap, uint64_t fromsnap, +#ifdef illumos + boolean_t embedok, int outfd, vnode_t *vp, offset_t *off) +#else + boolean_t embedok, int outfd, struct file *fp, offset_t *off) +#endif +{ + dsl_pool_t *dp; + dsl_dataset_t *ds; + dsl_dataset_t *fromds = NULL; + int err; + + err = dsl_pool_hold(pool, FTAG, &dp); + if (err != 0) + return (err); + + err = dsl_dataset_hold_obj(dp, tosnap, FTAG, &ds); + if (err != 0) { + dsl_pool_rele(dp, FTAG); + return (err); + } + + if (fromsnap != 0) { + zfs_bookmark_phys_t zb; + boolean_t is_clone; + + err = dsl_dataset_hold_obj(dp, fromsnap, FTAG, &fromds); + if (err != 0) { + dsl_dataset_rele(ds, FTAG); + dsl_pool_rele(dp, FTAG); + return (err); + } + if (!dsl_dataset_is_before(ds, fromds, 0)) + err = SET_ERROR(EXDEV); + zb.zbm_creation_time = fromds->ds_phys->ds_creation_time; + zb.zbm_creation_txg = fromds->ds_phys->ds_creation_txg; + zb.zbm_guid = fromds->ds_phys->ds_guid; + is_clone = (fromds->ds_dir != ds->ds_dir); + dsl_dataset_rele(fromds, FTAG); + err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone, embedok, + outfd, fp, off); + } else { + err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE, embedok, + outfd, fp, off); + } + dsl_dataset_rele(ds, FTAG); + return (err); +} + +int +dmu_send(const char *tosnap, const char *fromsnap, boolean_t embedok, +#ifdef illumos + int outfd, vnode_t *vp, offset_t *off) +#else + int outfd, struct file *fp, offset_t *off) +#endif +{ + dsl_pool_t *dp; + dsl_dataset_t *ds; + int err; + boolean_t owned = B_FALSE; + + if (fromsnap != NULL && strpbrk(fromsnap, "@#") == NULL) + return (SET_ERROR(EINVAL)); + + err = dsl_pool_hold(tosnap, FTAG, &dp); + if (err != 0) + return (err); + + if (strchr(tosnap, '@') == NULL && spa_writeable(dp->dp_spa)) { + /* + * We are sending a filesystem or volume. Ensure + * that it doesn't change by owning the dataset. + */ + err = dsl_dataset_own(dp, tosnap, FTAG, &ds); + owned = B_TRUE; + } else { + err = dsl_dataset_hold(dp, tosnap, FTAG, &ds); + } + if (err != 0) { + dsl_pool_rele(dp, FTAG); + return (err); + } + + if (fromsnap != NULL) { + zfs_bookmark_phys_t zb; + boolean_t is_clone = B_FALSE; + int fsnamelen = strchr(tosnap, '@') - tosnap; + + /* + * If the fromsnap is in a different filesystem, then + * mark the send stream as a clone. + */ + if (strncmp(tosnap, fromsnap, fsnamelen) != 0 || + (fromsnap[fsnamelen] != '@' && + fromsnap[fsnamelen] != '#')) { + is_clone = B_TRUE; + } + + if (strchr(fromsnap, '@')) { + dsl_dataset_t *fromds; + err = dsl_dataset_hold(dp, fromsnap, FTAG, &fromds); + if (err == 0) { + if (!dsl_dataset_is_before(ds, fromds, 0)) + err = SET_ERROR(EXDEV); + zb.zbm_creation_time = + fromds->ds_phys->ds_creation_time; + zb.zbm_creation_txg = + fromds->ds_phys->ds_creation_txg; + zb.zbm_guid = fromds->ds_phys->ds_guid; + is_clone = (ds->ds_dir != fromds->ds_dir); + dsl_dataset_rele(fromds, FTAG); + } + } else { + err = dsl_bookmark_lookup(dp, fromsnap, ds, &zb); + } + if (err != 0) { + dsl_dataset_rele(ds, FTAG); + dsl_pool_rele(dp, FTAG); + return (err); + } + err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone, embedok, + outfd, fp, off); + } else { + err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE, embedok, + outfd, fp, off); + } + if (owned) + dsl_dataset_disown(ds, FTAG); + else + dsl_dataset_rele(ds, FTAG); + return (err); +} + +int +dmu_send_estimate(dsl_dataset_t *ds, dsl_dataset_t *fromds, uint64_t *sizep) +{ + dsl_pool_t *dp = ds->ds_dir->dd_pool; + int err; + uint64_t size; + + ASSERT(dsl_pool_config_held(dp)); + + /* tosnap must be a snapshot */ + if (!dsl_dataset_is_snapshot(ds)) + return (SET_ERROR(EINVAL)); + + /* + * fromsnap must be an earlier snapshot from the same fs as tosnap, + * or the origin's fs. + */ + if (fromds != NULL && !dsl_dataset_is_before(ds, fromds, 0)) + return (SET_ERROR(EXDEV)); + + /* 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 (err != 0) + 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. + */ + uint64_t recordsize; + err = dsl_prop_get_int_ds(ds, "recordsize", &recordsize); + if (err != 0) + 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); +} + +typedef struct dmu_recv_begin_arg { + const char *drba_origin; + dmu_recv_cookie_t *drba_cookie; + cred_t *drba_cred; + uint64_t drba_snapobj; +} dmu_recv_begin_arg_t; + +static int +recv_begin_check_existing_impl(dmu_recv_begin_arg_t *drba, dsl_dataset_t *ds, + uint64_t fromguid) +{ + uint64_t val; + int error; + dsl_pool_t *dp = ds->ds_dir->dd_pool; + + /* temporary clone name must not exist */ + error = zap_lookup(dp->dp_meta_objset, + ds->ds_dir->dd_phys->dd_child_dir_zapobj, recv_clone_name, + 8, 1, &val); + if (error != ENOENT) + return (error == 0 ? EBUSY : error); + + /* new snapshot name must not exist */ + error = zap_lookup(dp->dp_meta_objset, + ds->ds_phys->ds_snapnames_zapobj, drba->drba_cookie->drc_tosnap, + 8, 1, &val); + if (error != ENOENT) + return (error == 0 ? EEXIST : error); + + /* + * Check snapshot limit before receiving. We'll recheck again at the + * end, but might as well abort before receiving if we're already over + * the limit. + * + * Note that we do not check the file system limit with + * dsl_dir_fscount_check because the temporary %clones don't count + * against that limit. + */ + error = dsl_fs_ss_limit_check(ds->ds_dir, 1, ZFS_PROP_SNAPSHOT_LIMIT, + NULL, drba->drba_cred); + if (error != 0) + return (error); + + if (fromguid != 0) { + dsl_dataset_t *snap; + uint64_t obj = ds->ds_phys->ds_prev_snap_obj; + + /* Find snapshot in this dir that matches fromguid. */ + while (obj != 0) { + error = dsl_dataset_hold_obj(dp, obj, FTAG, + &snap); + if (error != 0) + return (SET_ERROR(ENODEV)); + if (snap->ds_dir != ds->ds_dir) { + dsl_dataset_rele(snap, FTAG); + return (SET_ERROR(ENODEV)); + } + if (snap->ds_phys->ds_guid == fromguid) + break; + obj = snap->ds_phys->ds_prev_snap_obj; + dsl_dataset_rele(snap, FTAG); + } + if (obj == 0) + return (SET_ERROR(ENODEV)); + + if (drba->drba_cookie->drc_force) { + drba->drba_snapobj = obj; + } else { + /* + * If we are not forcing, there must be no + * changes since fromsnap. + */ + if (dsl_dataset_modified_since_snap(ds, snap)) { + dsl_dataset_rele(snap, FTAG); + return (SET_ERROR(ETXTBSY)); + } + drba->drba_snapobj = ds->ds_prev->ds_object; + } + + dsl_dataset_rele(snap, FTAG); + } else { + /* if full, most recent snapshot must be $ORIGIN */ + if (ds->ds_phys->ds_prev_snap_txg >= TXG_INITIAL) + return (SET_ERROR(ENODEV)); + drba->drba_snapobj = ds->ds_phys->ds_prev_snap_obj; + } + + return (0); + +} + +static int +dmu_recv_begin_check(void *arg, dmu_tx_t *tx) +{ + dmu_recv_begin_arg_t *drba = arg; + dsl_pool_t *dp = dmu_tx_pool(tx); + struct drr_begin *drrb = drba->drba_cookie->drc_drrb; + uint64_t fromguid = drrb->drr_fromguid; + int flags = drrb->drr_flags; + int error; + uint64_t featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo); + dsl_dataset_t *ds; + const char *tofs = drba->drba_cookie->drc_tofs; + + /* already checked */ + ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC); + + if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) == + DMU_COMPOUNDSTREAM || + drrb->drr_type >= DMU_OST_NUMTYPES || + ((flags & DRR_FLAG_CLONE) && drba->drba_origin == NULL)) + return (SET_ERROR(EINVAL)); + + /* Verify pool version supports SA if SA_SPILL feature set */ + if ((featureflags & DMU_BACKUP_FEATURE_SA_SPILL) && + spa_version(dp->dp_spa) < SPA_VERSION_SA) + return (SET_ERROR(ENOTSUP)); + + /* + * The receiving code doesn't know how to translate a WRITE_EMBEDDED + * record to a plan WRITE record, so the pool must have the + * EMBEDDED_DATA feature enabled if the stream has WRITE_EMBEDDED + * records. Same with WRITE_EMBEDDED records that use LZ4 compression. + */ + if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA) && + !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_EMBEDDED_DATA)) + return (SET_ERROR(ENOTSUP)); + if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA_LZ4) && + !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LZ4_COMPRESS)) + return (SET_ERROR(ENOTSUP)); + + error = dsl_dataset_hold(dp, tofs, FTAG, &ds); + if (error == 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, FTAG); + return (SET_ERROR(EINVAL)); + } + + error = recv_begin_check_existing_impl(drba, ds, fromguid); + dsl_dataset_rele(ds, FTAG); + } else if (error == ENOENT) { + /* target fs does not exist; must be a full backup or clone */ + char buf[MAXNAMELEN]; + + /* + * If it's a non-clone incremental, we are missing the + * target fs, so fail the recv. + */ + if (fromguid != 0 && !(flags & DRR_FLAG_CLONE)) + return (SET_ERROR(ENOENT)); + + /* Open the parent of tofs */ + ASSERT3U(strlen(tofs), <, MAXNAMELEN); + (void) strlcpy(buf, tofs, strrchr(tofs, '/') - tofs + 1); + error = dsl_dataset_hold(dp, buf, FTAG, &ds); + if (error != 0) + return (error); + + /* + * Check filesystem and snapshot limits before receiving. We'll + * recheck snapshot limits again at the end (we create the + * filesystems and increment those counts during begin_sync). + */ + error = dsl_fs_ss_limit_check(ds->ds_dir, 1, + ZFS_PROP_FILESYSTEM_LIMIT, NULL, drba->drba_cred); + if (error != 0) { + dsl_dataset_rele(ds, FTAG); + return (error); + } + + error = dsl_fs_ss_limit_check(ds->ds_dir, 1, + ZFS_PROP_SNAPSHOT_LIMIT, NULL, drba->drba_cred); + if (error != 0) { + dsl_dataset_rele(ds, FTAG); + return (error); + } + + if (drba->drba_origin != NULL) { + dsl_dataset_t *origin; + error = dsl_dataset_hold(dp, drba->drba_origin, + FTAG, &origin); + if (error != 0) { + dsl_dataset_rele(ds, FTAG); + return (error); + } + if (!dsl_dataset_is_snapshot(origin)) { + dsl_dataset_rele(origin, FTAG); + dsl_dataset_rele(ds, FTAG); + return (SET_ERROR(EINVAL)); + } + if (origin->ds_phys->ds_guid != fromguid) { + dsl_dataset_rele(origin, FTAG); + dsl_dataset_rele(ds, FTAG); + return (SET_ERROR(ENODEV)); + } + dsl_dataset_rele(origin, FTAG); + } + dsl_dataset_rele(ds, FTAG); + error = 0; + } + return (error); +} + +static void +dmu_recv_begin_sync(void *arg, dmu_tx_t *tx) +{ + dmu_recv_begin_arg_t *drba = arg; + dsl_pool_t *dp = dmu_tx_pool(tx); + struct drr_begin *drrb = drba->drba_cookie->drc_drrb; + const char *tofs = drba->drba_cookie->drc_tofs; + dsl_dataset_t *ds, *newds; + uint64_t dsobj; + int error; + uint64_t crflags; + + crflags = (drrb->drr_flags & DRR_FLAG_CI_DATA) ? + DS_FLAG_CI_DATASET : 0; + + error = dsl_dataset_hold(dp, tofs, FTAG, &ds); + if (error == 0) { + /* create temporary clone */ + dsl_dataset_t *snap = NULL; + if (drba->drba_snapobj != 0) { + VERIFY0(dsl_dataset_hold_obj(dp, + drba->drba_snapobj, FTAG, &snap)); + } + dsobj = dsl_dataset_create_sync(ds->ds_dir, recv_clone_name, + snap, crflags, drba->drba_cred, tx); + dsl_dataset_rele(snap, FTAG); + dsl_dataset_rele(ds, FTAG); + } else { + dsl_dir_t *dd; + const char *tail; + dsl_dataset_t *origin = NULL; + + VERIFY0(dsl_dir_hold(dp, tofs, FTAG, &dd, &tail)); + + if (drba->drba_origin != NULL) { + VERIFY0(dsl_dataset_hold(dp, drba->drba_origin, + FTAG, &origin)); + } + + /* Create new dataset. */ + dsobj = dsl_dataset_create_sync(dd, + strrchr(tofs, '/') + 1, + origin, crflags, drba->drba_cred, tx); + if (origin != NULL) + dsl_dataset_rele(origin, FTAG); + dsl_dir_rele(dd, FTAG); + drba->drba_cookie->drc_newfs = B_TRUE; + } + VERIFY0(dsl_dataset_own_obj(dp, dsobj, dmu_recv_tag, &newds)); + + dmu_buf_will_dirty(newds->ds_dbuf, tx); + newds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; + + /* + * 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(newds))) { + (void) dmu_objset_create_impl(dp->dp_spa, + newds, dsl_dataset_get_blkptr(newds), drrb->drr_type, tx); + } + + drba->drba_cookie->drc_ds = newds; + + spa_history_log_internal_ds(newds, "receive", tx, ""); +} + +/* + * 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, char *origin, dmu_recv_cookie_t *drc) +{ + dmu_recv_begin_arg_t drba = { 0 }; + dmu_replay_record_t *drr; + + bzero(drc, sizeof (dmu_recv_cookie_t)); + drc->drc_drrb = drrb; + drc->drc_tosnap = tosnap; + drc->drc_tofs = tofs; + drc->drc_force = force; + drc->drc_cred = CRED(); + + if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) + drc->drc_byteswap = B_TRUE; + else if (drrb->drr_magic != DMU_BACKUP_MAGIC) + return (SET_ERROR(EINVAL)); + + drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP); + drr->drr_type = DRR_BEGIN; + drr->drr_u.drr_begin = *drc->drc_drrb; + if (drc->drc_byteswap) { + fletcher_4_incremental_byteswap(drr, + sizeof (dmu_replay_record_t), &drc->drc_cksum); + } else { + fletcher_4_incremental_native(drr, + sizeof (dmu_replay_record_t), &drc->drc_cksum); + } + kmem_free(drr, sizeof (dmu_replay_record_t)); + + if (drc->drc_byteswap) { + 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); + } + + drba.drba_origin = origin; + drba.drba_cookie = drc; + drba.drba_cred = CRED(); + + return (dsl_sync_task(tofs, dmu_recv_begin_check, dmu_recv_begin_sync, + &drba, 5)); +} + +struct restorearg { + int err; + boolean_t byteswap; + kthread_t *td; + struct file *fp; + 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_long_rele(gmep->gme_ds, gmep); + dsl_dataset_rele(gmep->gme_ds, gmep); + kmem_free(gmep, sizeof (guid_map_entry_t)); + } + avl_destroy(ca); + kmem_free(ca, sizeof (avl_tree_t)); +} + +static int +restore_bytes(struct restorearg *ra, void *buf, int len, off_t off, ssize_t *resid) +{ + struct uio auio; + struct iovec aiov; + int error; + + aiov.iov_base = buf; + aiov.iov_len = len; + auio.uio_iov = &aiov; + auio.uio_iovcnt = 1; + auio.uio_resid = len; + auio.uio_segflg = UIO_SYSSPACE; + auio.uio_rw = UIO_READ; + auio.uio_offset = off; + auio.uio_td = ra->td; +#ifdef _KERNEL + error = fo_read(ra->fp, &auio, ra->td->td_ucred, FOF_OFFSET, ra->td); +#else + fprintf(stderr, "%s: returning EOPNOTSUPP\n", __func__); + error = EOPNOTSUPP; +#endif + *resid = auio.uio_resid; + return (error); +} + +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 = restore_bytes(ra, (caddr_t)ra->buf + done, + len - done, ra->voff, &resid); + + if (resid == len - done) + ra->err = SET_ERROR(EINVAL); + ra->voff += len - done - resid; + done = len - resid; + if (ra->err != 0) + 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); + 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_WRITE_EMBEDDED: + DO64(drr_write_embedded.drr_object); + DO64(drr_write_embedded.drr_offset); + DO64(drr_write_embedded.drr_length); + DO64(drr_write_embedded.drr_toguid); + DO32(drr_write_embedded.drr_lsize); + DO32(drr_write_embedded.drr_psize); + 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 || + !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 (SET_ERROR(EINVAL)); + } + + err = dmu_object_info(os, drro->drr_object, NULL); + + if (err != 0 && err != ENOENT) + return (SET_ERROR(EINVAL)); + + if (drro->drr_bonuslen) { + data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8)); + if (ra->err != 0) + 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 != 0) { + 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 != 0) { + return (SET_ERROR(EINVAL)); + } + + tx = dmu_tx_create(os); + dmu_tx_hold_bonus(tx, drro->drr_object); + err = dmu_tx_assign(tx, TXG_WAIT); + if (err != 0) { + 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 */ +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 (SET_ERROR(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_long_object(os, obj); + if (err != 0) + 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 || + !DMU_OT_IS_VALID(drrw->drr_type)) + return (SET_ERROR(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 (SET_ERROR(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 != 0) { + 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 (SET_ERROR(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 (SET_ERROR(EINVAL)); + } + if (dmu_objset_from_ds(gmep->gme_ds, &ref_os)) + return (SET_ERROR(EINVAL)); + } else { + ref_os = os; + } + + err = dmu_buf_hold(ref_os, drrwbr->drr_refobject, + drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH); + if (err != 0) + 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 != 0) { + 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_write_embedded(struct restorearg *ra, objset_t *os, + struct drr_write_embedded *drrwnp) +{ + dmu_tx_t *tx; + int err; + void *data; + + if (drrwnp->drr_offset + drrwnp->drr_length < drrwnp->drr_offset) + return (EINVAL); + + if (drrwnp->drr_psize > BPE_PAYLOAD_SIZE) + return (EINVAL); + + if (drrwnp->drr_etype >= NUM_BP_EMBEDDED_TYPES) + return (EINVAL); + if (drrwnp->drr_compression >= ZIO_COMPRESS_FUNCTIONS) + return (EINVAL); + + data = restore_read(ra, P2ROUNDUP(drrwnp->drr_psize, 8)); + if (data == NULL) + return (ra->err); + + tx = dmu_tx_create(os); + + dmu_tx_hold_write(tx, drrwnp->drr_object, + drrwnp->drr_offset, drrwnp->drr_length); + err = dmu_tx_assign(tx, TXG_WAIT); + if (err != 0) { + dmu_tx_abort(tx); + return (err); + } + + dmu_write_embedded(os, drrwnp->drr_object, + drrwnp->drr_offset, data, drrwnp->drr_etype, + drrwnp->drr_compression, drrwnp->drr_lsize, drrwnp->drr_psize, + ra->byteswap ^ ZFS_HOST_BYTEORDER, tx); + + 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 (SET_ERROR(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 (SET_ERROR(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 != 0) { + 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 (SET_ERROR(EINVAL)); + + if (dmu_object_info(os, drrf->drr_object, NULL) != 0) + return (SET_ERROR(EINVAL)); + + err = dmu_free_long_range(os, drrf->drr_object, + drrf->drr_offset, drrf->drr_length); + return (err); +} + +/* used to destroy the drc_ds on error */ +static void +dmu_recv_cleanup_ds(dmu_recv_cookie_t *drc) +{ + char name[MAXNAMELEN]; + dsl_dataset_name(drc->drc_ds, name); + dsl_dataset_disown(drc->drc_ds, dmu_recv_tag); + (void) dsl_destroy_head(name); +} + +/* + * NB: callers *must* call dmu_recv_end() if this succeeds. + */ +int +dmu_recv_stream(dmu_recv_cookie_t *drc, struct file *fp, 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; + + ra.byteswap = drc->drc_byteswap; + ra.cksum = drc->drc_cksum; + ra.td = curthread; + ra.fp = fp; + ra.voff = *voffp; + ra.bufsize = 1<<20; + ra.buf = kmem_alloc(ra.bufsize, KM_SLEEP); + + /* these were verified in dmu_recv_begin */ + ASSERT3U(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo), ==, + DMU_SUBSTREAM); + ASSERT3U(drc->drc_drrb->drr_type, <, DMU_OST_NUMTYPES); + + /* + * Open the objset we are modifying. + */ + VERIFY0(dmu_objset_from_ds(drc->drc_ds, &os)); + + ASSERT(drc->drc_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 = SET_ERROR(EBADF); + goto out; + } + ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor); + if (ra.err != 0) { + 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 != 0) + goto out; + } else { + ra.err = zfs_onexit_cb_data(minor, *action_handlep, + (void **)&ra.guid_to_ds_map); + if (ra.err != 0) + 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 = SET_ERROR(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_WRITE_EMBEDDED: + { + struct drr_write_embedded drrwe = + drr->drr_u.drr_write_embedded; + ra.err = restore_write_embedded(&ra, os, &drrwe); + 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 = SET_ERROR(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 = SET_ERROR(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. + */ + dmu_recv_cleanup_ds(drc); + } + + kmem_free(ra.buf, ra.bufsize); + *voffp = ra.voff; + return (ra.err); +} + +static int +dmu_recv_end_check(void *arg, dmu_tx_t *tx) +{ + dmu_recv_cookie_t *drc = arg; + dsl_pool_t *dp = dmu_tx_pool(tx); + int error; + + ASSERT3P(drc->drc_ds->ds_owner, ==, dmu_recv_tag); + + if (!drc->drc_newfs) { + dsl_dataset_t *origin_head; + + error = dsl_dataset_hold(dp, drc->drc_tofs, FTAG, &origin_head); + if (error != 0) + return (error); + if (drc->drc_force) { + /* + * We will destroy any snapshots in tofs (i.e. before + * origin_head) that are after the origin (which is + * the snap before drc_ds, because drc_ds can not + * have any snaps of its own). + */ + uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj; + while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) { + dsl_dataset_t *snap; + error = dsl_dataset_hold_obj(dp, obj, FTAG, + &snap); + if (error != 0) + return (error); + if (snap->ds_dir != origin_head->ds_dir) + error = SET_ERROR(EINVAL); + if (error == 0) { + error = dsl_destroy_snapshot_check_impl( + snap, B_FALSE); + } + obj = snap->ds_phys->ds_prev_snap_obj; + dsl_dataset_rele(snap, FTAG); + if (error != 0) + return (error); + } + } + error = dsl_dataset_clone_swap_check_impl(drc->drc_ds, + origin_head, drc->drc_force, drc->drc_owner, tx); + if (error != 0) { + dsl_dataset_rele(origin_head, FTAG); + return (error); + } + error = dsl_dataset_snapshot_check_impl(origin_head, + drc->drc_tosnap, tx, B_TRUE, 1, drc->drc_cred); + dsl_dataset_rele(origin_head, FTAG); + if (error != 0) + return (error); + + error = dsl_destroy_head_check_impl(drc->drc_ds, 1); + } else { + error = dsl_dataset_snapshot_check_impl(drc->drc_ds, + drc->drc_tosnap, tx, B_TRUE, 1, drc->drc_cred); + } + return (error); +} + +static void +dmu_recv_end_sync(void *arg, dmu_tx_t *tx) +{ + dmu_recv_cookie_t *drc = arg; + dsl_pool_t *dp = dmu_tx_pool(tx); + + spa_history_log_internal_ds(drc->drc_ds, "finish receiving", + tx, "snap=%s", drc->drc_tosnap); + + if (!drc->drc_newfs) { + dsl_dataset_t *origin_head; + + VERIFY0(dsl_dataset_hold(dp, drc->drc_tofs, FTAG, + &origin_head)); + + if (drc->drc_force) { + /* + * Destroy any snapshots of drc_tofs (origin_head) + * after the origin (the snap before drc_ds). + */ + uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj; + while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) { + dsl_dataset_t *snap; + VERIFY0(dsl_dataset_hold_obj(dp, obj, FTAG, + &snap)); + ASSERT3P(snap->ds_dir, ==, origin_head->ds_dir); + obj = snap->ds_phys->ds_prev_snap_obj; + dsl_destroy_snapshot_sync_impl(snap, + B_FALSE, tx); + dsl_dataset_rele(snap, FTAG); + } + } + VERIFY3P(drc->drc_ds->ds_prev, ==, + origin_head->ds_prev); + + dsl_dataset_clone_swap_sync_impl(drc->drc_ds, + origin_head, tx); + dsl_dataset_snapshot_sync_impl(origin_head, + drc->drc_tosnap, tx); + + /* set snapshot's creation time and guid */ + dmu_buf_will_dirty(origin_head->ds_prev->ds_dbuf, tx); + origin_head->ds_prev->ds_phys->ds_creation_time = + drc->drc_drrb->drr_creation_time; + origin_head->ds_prev->ds_phys->ds_guid = + drc->drc_drrb->drr_toguid; + origin_head->ds_prev->ds_phys->ds_flags &= + ~DS_FLAG_INCONSISTENT; + + dmu_buf_will_dirty(origin_head->ds_dbuf, tx); + origin_head->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT; + + dsl_dataset_rele(origin_head, FTAG); + dsl_destroy_head_sync_impl(drc->drc_ds, tx); + + if (drc->drc_owner != NULL) + VERIFY3P(origin_head->ds_owner, ==, drc->drc_owner); + } else { + dsl_dataset_t *ds = drc->drc_ds; + + dsl_dataset_snapshot_sync_impl(ds, drc->drc_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 = + drc->drc_drrb->drr_creation_time; + ds->ds_prev->ds_phys->ds_guid = drc->drc_drrb->drr_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; + } + drc->drc_newsnapobj = drc->drc_ds->ds_phys->ds_prev_snap_obj; + /* + * Release the hold from dmu_recv_begin. This must be done before + * we return to open context, so that when we free the dataset's dnode, + * we can evict its bonus buffer. + */ + dsl_dataset_disown(drc->drc_ds, dmu_recv_tag); + drc->drc_ds = NULL; +} + +static int +add_ds_to_guidmap(const char *name, avl_tree_t *guid_map, uint64_t snapobj) +{ + dsl_pool_t *dp; + dsl_dataset_t *snapds; + guid_map_entry_t *gmep; + int err; + + ASSERT(guid_map != NULL); + + err = dsl_pool_hold(name, FTAG, &dp); + if (err != 0) + return (err); + gmep = kmem_alloc(sizeof (*gmep), KM_SLEEP); + err = dsl_dataset_hold_obj(dp, snapobj, gmep, &snapds); + if (err == 0) { + gmep->guid = snapds->ds_phys->ds_guid; + gmep->gme_ds = snapds; + avl_add(guid_map, gmep); + dsl_dataset_long_hold(snapds, gmep); + } else + kmem_free(gmep, sizeof (*gmep)); + + dsl_pool_rele(dp, FTAG); + return (err); +} + +static int dmu_recv_end_modified_blocks = 3; + +static int +dmu_recv_existing_end(dmu_recv_cookie_t *drc) +{ + int error; + char name[MAXNAMELEN]; + +#ifdef _KERNEL + /* + * We will be destroying the ds; make sure its origin is unmounted if + * necessary. + */ + dsl_dataset_name(drc->drc_ds, name); + zfs_destroy_unmount_origin(name); +#endif + + error = dsl_sync_task(drc->drc_tofs, + dmu_recv_end_check, dmu_recv_end_sync, drc, + dmu_recv_end_modified_blocks); + + if (error != 0) + dmu_recv_cleanup_ds(drc); + return (error); +} + +static int +dmu_recv_new_end(dmu_recv_cookie_t *drc) +{ + int error; + + error = dsl_sync_task(drc->drc_tofs, + dmu_recv_end_check, dmu_recv_end_sync, drc, + dmu_recv_end_modified_blocks); + + if (error != 0) { + dmu_recv_cleanup_ds(drc); + } else if (drc->drc_guid_to_ds_map != NULL) { + (void) add_ds_to_guidmap(drc->drc_tofs, + drc->drc_guid_to_ds_map, + drc->drc_newsnapobj); + } + return (error); +} + +int +dmu_recv_end(dmu_recv_cookie_t *drc, void *owner) +{ + drc->drc_owner = owner; + + if (drc->drc_newfs) + return (dmu_recv_new_end(drc)); + else + return (dmu_recv_existing_end(drc)); +} + +/* + * Return TRUE if this objset is currently being received into. + */ +boolean_t +dmu_objset_is_receiving(objset_t *os) +{ + return (os->os_dsl_dataset != NULL && + os->os_dsl_dataset->ds_owner == dmu_recv_tag); +} |
