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-rw-r--r--uts/common/fs/zfs/dmu_send.c1606
1 files changed, 1606 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/dmu_send.c b/uts/common/fs/zfs/dmu_send.c
new file mode 100644
index 000000000000..e47d533a44f4
--- /dev/null
+++ b/uts/common/fs/zfs/dmu_send.c
@@ -0,0 +1,1606 @@
+/*
+ * 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.
+ */
+
+#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>
+
+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, arc_buf_t *pbuf,
+ 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 (dsl_read(NULL, spa, bp, pbuf,
+ 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 (dsl_read(NULL, spa, bp, pbuf,
+ 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);
+
+#ifdef _KERNEL
+ if (dmu_objset_type(tosnap) == DMU_OST_ZFS) {
+ uint64_t version;
+ if (zfs_get_zplprop(tosnap, ZFS_PROP_VERSION, &version) != 0)
+ return (EINVAL);
+ if (version == ZPL_VERSION_SA) {
+ DMU_SET_FEATUREFLAGS(
+ drr->drr_u.drr_begin.drr_versioninfo,
+ DMU_BACKUP_FEATURE_SA_SPILL);
+ }
+ }
+#endif
+
+ drr->drr_u.drr_begin.drr_creation_time =
+ ds->ds_phys->ds_creation_time;
+ drr->drr_u.drr_begin.drr_type = tosnap->os_phys->os_type;
+ if (fromorigin)
+ drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE;
+ drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid;
+ if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET)
+ drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA;
+
+ if (fromds)
+ drr->drr_u.drr_begin.drr_fromguid = fromds->ds_phys->ds_guid;
+ dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname);
+
+ if (fromds)
+ fromtxg = fromds->ds_phys->ds_creation_txg;
+ if (fromorigin)
+ dsl_dataset_rele(fromds, FTAG);
+
+ 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 */
+ cred_t *cr;
+};
+
+/* ARGSUSED */
+static int
+recv_new_check(void *arg1, void *arg2, dmu_tx_t *tx)
+{
+ dsl_dir_t *dd = arg1;
+ struct recvbeginsyncarg *rbsa = arg2;
+ objset_t *mos = dd->dd_pool->dp_meta_objset;
+ uint64_t val;
+ int err;
+
+ err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj,
+ strrchr(rbsa->tofs, '/') + 1, sizeof (uint64_t), 1, &val);
+
+ if (err != ENOENT)
+ return (err ? err : EEXIST);
+
+ if (rbsa->origin) {
+ /* make sure it's a snap in the same pool */
+ if (rbsa->origin->ds_dir->dd_pool != dd->dd_pool)
+ return (EXDEV);
+ if (!dsl_dataset_is_snapshot(rbsa->origin))
+ return (EINVAL);
+ if (rbsa->origin->ds_phys->ds_guid != rbsa->fromguid)
+ return (ENODEV);
+ }
+
+ return (0);
+}
+
+static void
+recv_new_sync(void *arg1, void *arg2, dmu_tx_t *tx)
+{
+ dsl_dir_t *dd = arg1;
+ struct recvbeginsyncarg *rbsa = arg2;
+ uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
+ uint64_t dsobj;
+
+ /* Create and open new dataset. */
+ dsobj = dsl_dataset_create_sync(dd, strrchr(rbsa->tofs, '/') + 1,
+ rbsa->origin, flags, rbsa->cr, tx);
+ VERIFY(0 == dsl_dataset_own_obj(dd->dd_pool, dsobj,
+ B_TRUE, dmu_recv_tag, &rbsa->ds));
+
+ if (rbsa->origin == NULL) {
+ (void) dmu_objset_create_impl(dd->dd_pool->dp_spa,
+ rbsa->ds, &rbsa->ds->ds_phys->ds_bp, rbsa->type, tx);
+ }
+
+ spa_history_log_internal(LOG_DS_REPLAY_FULL_SYNC,
+ dd->dd_pool->dp_spa, tx, "dataset = %lld", dsobj);
+}
+
+/* ARGSUSED */
+static int
+recv_existing_check(void *arg1, void *arg2, dmu_tx_t *tx)
+{
+ dsl_dataset_t *ds = arg1;
+ struct recvbeginsyncarg *rbsa = arg2;
+ int err;
+ uint64_t val;
+
+ /* must not have any changes since most recent snapshot */
+ if (!rbsa->force && dsl_dataset_modified_since_lastsnap(ds))
+ return (ETXTBSY);
+
+ /* new snapshot name must not exist */
+ err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset,
+ ds->ds_phys->ds_snapnames_zapobj, rbsa->tosnap, 8, 1, &val);
+ if (err == 0)
+ return (EEXIST);
+ if (err != ENOENT)
+ return (err);
+
+ if (rbsa->fromguid) {
+ /* if incremental, most recent snapshot must match fromguid */
+ if (ds->ds_prev == NULL)
+ return (ENODEV);
+
+ /*
+ * most recent snapshot must match fromguid, or there are no
+ * changes since the fromguid one
+ */
+ if (ds->ds_prev->ds_phys->ds_guid != rbsa->fromguid) {
+ uint64_t birth = ds->ds_prev->ds_phys->ds_bp.blk_birth;
+ uint64_t obj = ds->ds_prev->ds_phys->ds_prev_snap_obj;
+ while (obj != 0) {
+ dsl_dataset_t *snap;
+ err = dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
+ obj, FTAG, &snap);
+ if (err)
+ return (ENODEV);
+ if (snap->ds_phys->ds_creation_txg < birth) {
+ dsl_dataset_rele(snap, FTAG);
+ return (ENODEV);
+ }
+ if (snap->ds_phys->ds_guid == rbsa->fromguid) {
+ dsl_dataset_rele(snap, FTAG);
+ break; /* it's ok */
+ }
+ obj = snap->ds_phys->ds_prev_snap_obj;
+ dsl_dataset_rele(snap, FTAG);
+ }
+ if (obj == 0)
+ return (ENODEV);
+ }
+ } else {
+ /* if full, most recent snapshot must be $ORIGIN */
+ if (ds->ds_phys->ds_prev_snap_txg >= TXG_INITIAL)
+ return (ENODEV);
+ }
+
+ /* temporary clone name must not exist */
+ err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset,
+ ds->ds_dir->dd_phys->dd_child_dir_zapobj,
+ rbsa->clonelastname, 8, 1, &val);
+ if (err == 0)
+ return (EEXIST);
+ if (err != ENOENT)
+ return (err);
+
+ return (0);
+}
+
+/* ARGSUSED */
+static void
+recv_existing_sync(void *arg1, void *arg2, dmu_tx_t *tx)
+{
+ dsl_dataset_t *ohds = arg1;
+ struct recvbeginsyncarg *rbsa = arg2;
+ dsl_pool_t *dp = ohds->ds_dir->dd_pool;
+ dsl_dataset_t *cds;
+ uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
+ uint64_t dsobj;
+
+ /* create and open the temporary clone */
+ dsobj = dsl_dataset_create_sync(ohds->ds_dir, rbsa->clonelastname,
+ ohds->ds_prev, flags, rbsa->cr, tx);
+ VERIFY(0 == dsl_dataset_own_obj(dp, dsobj, B_TRUE, dmu_recv_tag, &cds));
+
+ /*
+ * If we actually created a non-clone, we need to create the
+ * objset in our new dataset.
+ */
+ if (BP_IS_HOLE(dsl_dataset_get_blkptr(cds))) {
+ (void) dmu_objset_create_impl(dp->dp_spa,
+ cds, dsl_dataset_get_blkptr(cds), rbsa->type, tx);
+ }
+
+ rbsa->ds = cds;
+
+ spa_history_log_internal(LOG_DS_REPLAY_INC_SYNC,
+ dp->dp_spa, tx, "dataset = %lld", dsobj);
+}
+
+static boolean_t
+dmu_recv_verify_features(dsl_dataset_t *ds, struct drr_begin *drrb)
+{
+ int featureflags;
+
+ featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
+
+ /* Verify pool version supports SA if SA_SPILL feature set */
+ return ((featureflags & DMU_BACKUP_FEATURE_SA_SPILL) &&
+ (spa_version(dsl_dataset_get_spa(ds)) < SPA_VERSION_SA));
+}
+
+/*
+ * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin()
+ * succeeds; otherwise we will leak the holds on the datasets.
+ */
+int
+dmu_recv_begin(char *tofs, char *tosnap, char *top_ds, struct drr_begin *drrb,
+ boolean_t force, objset_t *origin, dmu_recv_cookie_t *drc)
+{
+ int err = 0;
+ boolean_t byteswap;
+ struct recvbeginsyncarg rbsa = { 0 };
+ uint64_t versioninfo;
+ int flags;
+ dsl_dataset_t *ds;
+
+ if (drrb->drr_magic == DMU_BACKUP_MAGIC)
+ byteswap = FALSE;
+ else if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
+ byteswap = TRUE;
+ else
+ return (EINVAL);
+
+ rbsa.tofs = tofs;
+ rbsa.tosnap = tosnap;
+ rbsa.origin = origin ? origin->os_dsl_dataset : NULL;
+ rbsa.fromguid = drrb->drr_fromguid;
+ rbsa.type = drrb->drr_type;
+ rbsa.tag = FTAG;
+ rbsa.dsflags = 0;
+ rbsa.cr = CRED();
+ versioninfo = drrb->drr_versioninfo;
+ flags = drrb->drr_flags;
+
+ if (byteswap) {
+ rbsa.type = BSWAP_32(rbsa.type);
+ rbsa.fromguid = BSWAP_64(rbsa.fromguid);
+ versioninfo = BSWAP_64(versioninfo);
+ flags = BSWAP_32(flags);
+ }
+
+ if (DMU_GET_STREAM_HDRTYPE(versioninfo) == DMU_COMPOUNDSTREAM ||
+ rbsa.type >= DMU_OST_NUMTYPES ||
+ ((flags & DRR_FLAG_CLONE) && origin == NULL))
+ return (EINVAL);
+
+ if (flags & DRR_FLAG_CI_DATA)
+ rbsa.dsflags = DS_FLAG_CI_DATASET;
+
+ bzero(drc, sizeof (dmu_recv_cookie_t));
+ drc->drc_drrb = drrb;
+ drc->drc_tosnap = tosnap;
+ drc->drc_top_ds = top_ds;
+ drc->drc_force = force;
+
+ /*
+ * Process the begin in syncing context.
+ */
+
+ /* open the dataset we are logically receiving into */
+ err = dsl_dataset_hold(tofs, dmu_recv_tag, &ds);
+ if (err == 0) {
+ if (dmu_recv_verify_features(ds, drrb)) {
+ dsl_dataset_rele(ds, dmu_recv_tag);
+ return (ENOTSUP);
+ }
+ /* target fs already exists; recv into temp clone */
+
+ /* Can't recv a clone into an existing fs */
+ if (flags & DRR_FLAG_CLONE) {
+ dsl_dataset_rele(ds, dmu_recv_tag);
+ return (EINVAL);
+ }
+
+ /* must not have an incremental recv already in progress */
+ if (!mutex_tryenter(&ds->ds_recvlock)) {
+ dsl_dataset_rele(ds, dmu_recv_tag);
+ return (EBUSY);
+ }
+
+ /* tmp clone name is: tofs/%tosnap" */
+ (void) snprintf(rbsa.clonelastname, sizeof (rbsa.clonelastname),
+ "%%%s", tosnap);
+ rbsa.force = force;
+ err = dsl_sync_task_do(ds->ds_dir->dd_pool,
+ recv_existing_check, recv_existing_sync, ds, &rbsa, 5);
+ if (err) {
+ mutex_exit(&ds->ds_recvlock);
+ dsl_dataset_rele(ds, dmu_recv_tag);
+ return (err);
+ }
+ drc->drc_logical_ds = ds;
+ drc->drc_real_ds = rbsa.ds;
+ } else if (err == ENOENT) {
+ /* target fs does not exist; must be a full backup or clone */
+ char *cp;
+
+ /*
+ * If it's a non-clone incremental, we are missing the
+ * target fs, so fail the recv.
+ */
+ if (rbsa.fromguid && !(flags & DRR_FLAG_CLONE))
+ return (ENOENT);
+
+ /* Open the parent of tofs */
+ cp = strrchr(tofs, '/');
+ *cp = '\0';
+ err = dsl_dataset_hold(tofs, FTAG, &ds);
+ *cp = '/';
+ if (err)
+ return (err);
+
+ if (dmu_recv_verify_features(ds, drrb)) {
+ dsl_dataset_rele(ds, FTAG);
+ return (ENOTSUP);
+ }
+
+ err = dsl_sync_task_do(ds->ds_dir->dd_pool,
+ recv_new_check, recv_new_sync, ds->ds_dir, &rbsa, 5);
+ dsl_dataset_rele(ds, FTAG);
+ if (err)
+ return (err);
+ drc->drc_logical_ds = drc->drc_real_ds = rbsa.ds;
+ drc->drc_newfs = B_TRUE;
+ }
+
+ return (err);
+}
+
+struct restorearg {
+ int err;
+ int byteswap;
+ vnode_t *vp;
+ char *buf;
+ uint64_t voff;
+ int bufsize; /* amount of memory allocated for buf */
+ zio_cksum_t cksum;
+ avl_tree_t *guid_to_ds_map;
+};
+
+typedef struct guid_map_entry {
+ uint64_t guid;
+ dsl_dataset_t *gme_ds;
+ avl_node_t avlnode;
+} guid_map_entry_t;
+
+static int
+guid_compare(const void *arg1, const void *arg2)
+{
+ const guid_map_entry_t *gmep1 = arg1;
+ const guid_map_entry_t *gmep2 = arg2;
+
+ if (gmep1->guid < gmep2->guid)
+ return (-1);
+ else if (gmep1->guid > gmep2->guid)
+ return (1);
+ return (0);
+}
+
+/*
+ * 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
+free_guid_map_onexit(void *arg)
+{
+ avl_tree_t *ca = arg;
+ void *cookie = NULL;
+ guid_map_entry_t *gmep;
+
+ while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) {
+ dsl_dataset_rele(gmep->gme_ds, ca);
+ kmem_free(gmep, sizeof (guid_map_entry_t));
+ }
+ avl_destroy(ca);
+ kmem_free(ca, sizeof (avl_tree_t));
+}
+
+static void *
+restore_read(struct restorearg *ra, int len)
+{
+ void *rv;
+ int done = 0;
+
+ /* some things will require 8-byte alignment, so everything must */
+ 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, DMU_READ_PREFETCH))
+ 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,
+ int cleanup_fd, uint64_t *action_handlep)
+{
+ struct restorearg ra = { 0 };
+ dmu_replay_record_t *drr;
+ objset_t *os;
+ zio_cksum_t pcksum;
+ int featureflags;
+
+ if (drc->drc_drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
+ ra.byteswap = TRUE;
+
+ {
+ /* compute checksum of drr_begin record */
+ dmu_replay_record_t *drr;
+ drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
+
+ drr->drr_type = DRR_BEGIN;
+ drr->drr_u.drr_begin = *drc->drc_drrb;
+ if (ra.byteswap) {
+ fletcher_4_incremental_byteswap(drr,
+ sizeof (dmu_replay_record_t), &ra.cksum);
+ } else {
+ fletcher_4_incremental_native(drr,
+ sizeof (dmu_replay_record_t), &ra.cksum);
+ }
+ kmem_free(drr, sizeof (dmu_replay_record_t));
+ }
+
+ if (ra.byteswap) {
+ struct drr_begin *drrb = drc->drc_drrb;
+ drrb->drr_magic = BSWAP_64(drrb->drr_magic);
+ drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo);
+ drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
+ drrb->drr_type = BSWAP_32(drrb->drr_type);
+ drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
+ drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
+ }
+
+ ra.vp = vp;
+ ra.voff = *voffp;
+ ra.bufsize = 1<<20;
+ ra.buf = 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) {
+ minor_t minor;
+
+ if (cleanup_fd == -1) {
+ ra.err = EBADF;
+ goto out;
+ }
+ ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor);
+ if (ra.err) {
+ cleanup_fd = -1;
+ goto out;
+ }
+
+ if (*action_handlep == 0) {
+ ra.guid_to_ds_map =
+ kmem_alloc(sizeof (avl_tree_t), KM_SLEEP);
+ avl_create(ra.guid_to_ds_map, guid_compare,
+ sizeof (guid_map_entry_t),
+ offsetof(guid_map_entry_t, avlnode));
+ (void) dmu_objset_find(drc->drc_top_ds, find_ds_by_guid,
+ (void *)ra.guid_to_ds_map,
+ DS_FIND_CHILDREN);
+ ra.err = zfs_onexit_add_cb(minor,
+ free_guid_map_onexit, ra.guid_to_ds_map,
+ action_handlep);
+ if (ra.err)
+ goto out;
+ } else {
+ ra.err = zfs_onexit_cb_data(minor, *action_handlep,
+ (void **)&ra.guid_to_ds_map);
+ if (ra.err)
+ goto out;
+ }
+ }
+
+ /*
+ * Read records and process them.
+ */
+ pcksum = ra.cksum;
+ while (ra.err == 0 &&
+ NULL != (drr = restore_read(&ra, sizeof (*drr)))) {
+ if (issig(JUSTLOOKING) && issig(FORREAL)) {
+ ra.err = EINTR;
+ goto out;
+ }
+
+ if (ra.byteswap)
+ backup_byteswap(drr);
+
+ switch (drr->drr_type) {
+ case DRR_OBJECT:
+ {
+ /*
+ * We need to make a copy of the record header,
+ * because restore_{object,write} may need to
+ * restore_read(), which will invalidate drr.
+ */
+ struct drr_object drro = drr->drr_u.drr_object;
+ ra.err = restore_object(&ra, os, &drro);
+ break;
+ }
+ case DRR_FREEOBJECTS:
+ {
+ struct drr_freeobjects drrfo =
+ drr->drr_u.drr_freeobjects;
+ ra.err = restore_freeobjects(&ra, os, &drrfo);
+ break;
+ }
+ case DRR_WRITE:
+ {
+ struct drr_write drrw = drr->drr_u.drr_write;
+ ra.err = restore_write(&ra, os, &drrw);
+ break;
+ }
+ case DRR_WRITE_BYREF:
+ {
+ struct drr_write_byref drrwbr =
+ drr->drr_u.drr_write_byref;
+ ra.err = restore_write_byref(&ra, os, &drrwbr);
+ break;
+ }
+ case DRR_FREE:
+ {
+ struct drr_free drrf = drr->drr_u.drr_free;
+ ra.err = restore_free(&ra, os, &drrf);
+ break;
+ }
+ case DRR_END:
+ {
+ struct drr_end drre = drr->drr_u.drr_end;
+ /*
+ * We compare against the *previous* checksum
+ * value, because the stored checksum is of
+ * everything before the DRR_END record.
+ */
+ if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum))
+ ra.err = ECKSUM;
+ goto out;
+ }
+ case DRR_SPILL:
+ {
+ struct drr_spill drrs = drr->drr_u.drr_spill;
+ ra.err = restore_spill(&ra, os, &drrs);
+ break;
+ }
+ default:
+ ra.err = EINVAL;
+ goto out;
+ }
+ pcksum = ra.cksum;
+ }
+ ASSERT(ra.err != 0);
+
+out:
+ if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1))
+ zfs_onexit_fd_rele(cleanup_fd);
+
+ if (ra.err != 0) {
+ /*
+ * destroy what we created, so we don't leave it in the
+ * inconsistent restoring state.
+ */
+ txg_wait_synced(drc->drc_real_ds->ds_dir->dd_pool, 0);
+
+ (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag,
+ B_FALSE);
+ if (drc->drc_real_ds != drc->drc_logical_ds) {
+ mutex_exit(&drc->drc_logical_ds->ds_recvlock);
+ dsl_dataset_rele(drc->drc_logical_ds, dmu_recv_tag);
+ }
+ }
+
+ 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, dmu_tx_t *tx)
+{
+ dsl_dataset_t *ds = arg1;
+ struct recvendsyncarg *resa = arg2;
+
+ dsl_dataset_snapshot_sync(ds, resa->tosnap, tx);
+
+ /* set snapshot's creation time and guid */
+ dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
+ ds->ds_prev->ds_phys->ds_creation_time = resa->creation_time;
+ ds->ds_prev->ds_phys->ds_guid = resa->toguid;
+ ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
+
+ dmu_buf_will_dirty(ds->ds_dbuf, tx);
+ ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
+}
+
+static int
+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));
+}