/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #include #include #include #include #include #include #include #include #include #include #include #define SET_BOOKMARK(zb, objset, object, level, blkid) \ { \ (zb)->zb_objset = objset; \ (zb)->zb_object = object; \ (zb)->zb_level = level; \ (zb)->zb_blkid = blkid; \ } struct prefetch_data { kmutex_t pd_mtx; kcondvar_t pd_cv; int pd_blks_max; int pd_blks_fetched; int pd_flags; boolean_t pd_cancel; boolean_t pd_exited; }; struct traverse_data { spa_t *td_spa; uint64_t td_objset; blkptr_t *td_rootbp; uint64_t td_min_txg; int td_flags; struct prefetch_data *td_pfd; blkptr_cb_t *td_func; void *td_arg; }; static int traverse_dnode(struct traverse_data *td, const dnode_phys_t *dnp, arc_buf_t *buf, uint64_t objset, uint64_t object); /* ARGSUSED */ static void traverse_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) { struct traverse_data *td = arg; zbookmark_t zb; if (bp->blk_birth == 0) return; if (claim_txg == 0 && bp->blk_birth >= spa_first_txg(td->td_spa)) return; zb.zb_objset = td->td_objset; zb.zb_object = 0; zb.zb_level = -1; zb.zb_blkid = bp->blk_cksum.zc_word[ZIL_ZC_SEQ]; VERIFY(0 == td->td_func(td->td_spa, bp, &zb, NULL, td->td_arg)); } /* ARGSUSED */ static void traverse_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg) { struct traverse_data *td = arg; if (lrc->lrc_txtype == TX_WRITE) { lr_write_t *lr = (lr_write_t *)lrc; blkptr_t *bp = &lr->lr_blkptr; zbookmark_t zb; if (bp->blk_birth == 0) return; if (claim_txg == 0 || bp->blk_birth < claim_txg) return; zb.zb_objset = td->td_objset; zb.zb_object = lr->lr_foid; zb.zb_level = BP_GET_LEVEL(bp); zb.zb_blkid = lr->lr_offset / BP_GET_LSIZE(bp); VERIFY(0 == td->td_func(td->td_spa, bp, &zb, NULL, td->td_arg)); } } static void traverse_zil(struct traverse_data *td, zil_header_t *zh) { uint64_t claim_txg = zh->zh_claim_txg; zilog_t *zilog; /* * We only want to visit blocks that have been claimed but not yet * replayed (or, in read-only mode, blocks that *would* be claimed). */ if (claim_txg == 0 && spa_writeable(td->td_spa)) return; zilog = zil_alloc(spa_get_dsl(td->td_spa)->dp_meta_objset, zh); (void) zil_parse(zilog, traverse_zil_block, traverse_zil_record, td, claim_txg); zil_free(zilog); } static int traverse_visitbp(struct traverse_data *td, const dnode_phys_t *dnp, arc_buf_t *pbuf, blkptr_t *bp, const zbookmark_t *zb) { zbookmark_t czb; int err = 0; arc_buf_t *buf = NULL; struct prefetch_data *pd = td->td_pfd; if (bp->blk_birth == 0) { err = td->td_func(td->td_spa, NULL, zb, dnp, td->td_arg); return (err); } if (bp->blk_birth <= td->td_min_txg) return (0); if (pd && !pd->pd_exited && ((pd->pd_flags & TRAVERSE_PREFETCH_DATA) || BP_GET_TYPE(bp) == DMU_OT_DNODE || BP_GET_LEVEL(bp) > 0)) { mutex_enter(&pd->pd_mtx); ASSERT(pd->pd_blks_fetched >= 0); while (pd->pd_blks_fetched == 0 && !pd->pd_exited) cv_wait(&pd->pd_cv, &pd->pd_mtx); pd->pd_blks_fetched--; cv_broadcast(&pd->pd_cv); mutex_exit(&pd->pd_mtx); } if (td->td_flags & TRAVERSE_PRE) { err = td->td_func(td->td_spa, bp, zb, dnp, td->td_arg); if (err) return (err); } if (BP_GET_LEVEL(bp) > 0) { uint32_t flags = ARC_WAIT; int i; blkptr_t *cbp; int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; err = arc_read(NULL, td->td_spa, bp, pbuf, arc_getbuf_func, &buf, ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); if (err) return (err); /* recursively visitbp() blocks below this */ cbp = buf->b_data; for (i = 0; i < epb; i++, cbp++) { SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, zb->zb_level - 1, zb->zb_blkid * epb + i); err = traverse_visitbp(td, dnp, buf, cbp, &czb); if (err) break; } } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { uint32_t flags = ARC_WAIT; int i; int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; err = arc_read(NULL, td->td_spa, bp, pbuf, arc_getbuf_func, &buf, ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); if (err) return (err); /* recursively visitbp() blocks below this */ dnp = buf->b_data; for (i = 0; i < epb && err == 0; i++, dnp++) { err = traverse_dnode(td, dnp, buf, zb->zb_objset, zb->zb_blkid * epb + i); if (err) break; } } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) { uint32_t flags = ARC_WAIT; objset_phys_t *osp; dnode_phys_t *dnp; err = arc_read_nolock(NULL, td->td_spa, bp, arc_getbuf_func, &buf, ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); if (err) return (err); osp = buf->b_data; traverse_zil(td, &osp->os_zil_header); dnp = &osp->os_meta_dnode; err = traverse_dnode(td, dnp, buf, zb->zb_objset, 0); if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) { dnp = &osp->os_userused_dnode; err = traverse_dnode(td, dnp, buf, zb->zb_objset, DMU_USERUSED_OBJECT); } if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) { dnp = &osp->os_groupused_dnode; err = traverse_dnode(td, dnp, buf, zb->zb_objset, DMU_GROUPUSED_OBJECT); } } if (buf) (void) arc_buf_remove_ref(buf, &buf); if (err == 0 && (td->td_flags & TRAVERSE_POST)) err = td->td_func(td->td_spa, bp, zb, dnp, td->td_arg); return (err); } static int traverse_dnode(struct traverse_data *td, const dnode_phys_t *dnp, arc_buf_t *buf, uint64_t objset, uint64_t object) { int j, err = 0; zbookmark_t czb; for (j = 0; j < dnp->dn_nblkptr; j++) { SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); err = traverse_visitbp(td, dnp, buf, (blkptr_t *)&dnp->dn_blkptr[j], &czb); if (err) break; } return (err); } /* ARGSUSED */ static int traverse_prefetcher(spa_t *spa, blkptr_t *bp, const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg) { struct prefetch_data *pfd = arg; uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; ASSERT(pfd->pd_blks_fetched >= 0); if (pfd->pd_cancel) return (EINTR); if (bp == NULL || !((pfd->pd_flags & TRAVERSE_PREFETCH_DATA) || BP_GET_TYPE(bp) == DMU_OT_DNODE || BP_GET_LEVEL(bp) > 0)) return (0); mutex_enter(&pfd->pd_mtx); while (!pfd->pd_cancel && pfd->pd_blks_fetched >= pfd->pd_blks_max) cv_wait(&pfd->pd_cv, &pfd->pd_mtx); pfd->pd_blks_fetched++; cv_broadcast(&pfd->pd_cv); mutex_exit(&pfd->pd_mtx); (void) arc_read_nolock(NULL, spa, bp, NULL, NULL, ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, &aflags, zb); return (0); } static void traverse_prefetch_thread(void *arg) { struct traverse_data *td_main = arg; struct traverse_data td = *td_main; zbookmark_t czb; td.td_func = traverse_prefetcher; td.td_arg = td_main->td_pfd; td.td_pfd = NULL; SET_BOOKMARK(&czb, td.td_objset, 0, -1, 0); (void) traverse_visitbp(&td, NULL, NULL, td.td_rootbp, &czb); mutex_enter(&td_main->td_pfd->pd_mtx); td_main->td_pfd->pd_exited = B_TRUE; cv_broadcast(&td_main->td_pfd->pd_cv); mutex_exit(&td_main->td_pfd->pd_mtx); } /* * NB: dataset must not be changing on-disk (eg, is a snapshot or we are * in syncing context). */ static int traverse_impl(spa_t *spa, uint64_t objset, blkptr_t *rootbp, uint64_t txg_start, int flags, blkptr_cb_t func, void *arg) { struct traverse_data td; struct prefetch_data pd; zbookmark_t czb; int err; td.td_spa = spa; td.td_objset = objset; td.td_rootbp = rootbp; td.td_min_txg = txg_start; td.td_func = func; td.td_arg = arg; td.td_pfd = &pd; td.td_flags = flags; pd.pd_blks_max = 100; pd.pd_blks_fetched = 0; pd.pd_flags = flags; pd.pd_cancel = B_FALSE; pd.pd_exited = B_FALSE; mutex_init(&pd.pd_mtx, NULL, MUTEX_DEFAULT, NULL); cv_init(&pd.pd_cv, NULL, CV_DEFAULT, NULL); if (!(flags & TRAVERSE_PREFETCH) || 0 == taskq_dispatch(system_taskq, traverse_prefetch_thread, &td, TQ_NOQUEUE)) pd.pd_exited = B_TRUE; SET_BOOKMARK(&czb, objset, 0, -1, 0); err = traverse_visitbp(&td, NULL, NULL, rootbp, &czb); mutex_enter(&pd.pd_mtx); pd.pd_cancel = B_TRUE; cv_broadcast(&pd.pd_cv); while (!pd.pd_exited) cv_wait(&pd.pd_cv, &pd.pd_mtx); mutex_exit(&pd.pd_mtx); mutex_destroy(&pd.pd_mtx); cv_destroy(&pd.pd_cv); return (err); } /* * NB: dataset must not be changing on-disk (eg, is a snapshot or we are * in syncing context). */ int traverse_dataset(dsl_dataset_t *ds, uint64_t txg_start, int flags, blkptr_cb_t func, void *arg) { return (traverse_impl(ds->ds_dir->dd_pool->dp_spa, ds->ds_object, &ds->ds_phys->ds_bp, txg_start, flags, func, arg)); } /* * NB: pool must not be changing on-disk (eg, from zdb or sync context). */ int traverse_pool(spa_t *spa, blkptr_cb_t func, void *arg) { int err; uint64_t obj; dsl_pool_t *dp = spa_get_dsl(spa); objset_t *mos = dp->dp_meta_objset; /* visit the MOS */ err = traverse_impl(spa, 0, spa_get_rootblkptr(spa), 0, TRAVERSE_PRE, func, arg); if (err) return (err); /* visit each dataset */ for (obj = 1; err == 0; err = dmu_object_next(mos, &obj, FALSE, 0)) { dmu_object_info_t doi; err = dmu_object_info(mos, obj, &doi); if (err) return (err); if (doi.doi_type == DMU_OT_DSL_DATASET) { dsl_dataset_t *ds; rw_enter(&dp->dp_config_rwlock, RW_READER); err = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); rw_exit(&dp->dp_config_rwlock); if (err) return (err); err = traverse_dataset(ds, ds->ds_phys->ds_prev_snap_txg, TRAVERSE_PRE, func, arg); dsl_dataset_rele(ds, FTAG); if (err) return (err); } } if (err == ESRCH) err = 0; return (err); }