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-rw-r--r--uts/common/fs/zfs/dmu_traverse.c569
1 files changed, 569 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/dmu_traverse.c b/uts/common/fs/zfs/dmu_traverse.c
new file mode 100644
index 000000000000..bfe9e6506426
--- /dev/null
+++ b/uts/common/fs/zfs/dmu_traverse.c
@@ -0,0 +1,569 @@
+/*
+ * 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 (c) 2012 by Delphix. All rights reserved.
+ */
+
+#include <sys/zfs_context.h>
+#include <sys/dmu_objset.h>
+#include <sys/dmu_traverse.h>
+#include <sys/dsl_dataset.h>
+#include <sys/dsl_dir.h>
+#include <sys/dsl_pool.h>
+#include <sys/dnode.h>
+#include <sys/spa.h>
+#include <sys/zio.h>
+#include <sys/dmu_impl.h>
+#include <sys/sa.h>
+#include <sys/sa_impl.h>
+#include <sys/callb.h>
+
+int zfs_pd_blks_max = 100;
+
+typedef 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;
+} prefetch_data_t;
+
+typedef struct traverse_data {
+ spa_t *td_spa;
+ uint64_t td_objset;
+ blkptr_t *td_rootbp;
+ uint64_t td_min_txg;
+ zbookmark_t *td_resume;
+ int td_flags;
+ prefetch_data_t *td_pfd;
+ blkptr_cb_t *td_func;
+ void *td_arg;
+} traverse_data_t;
+
+static int traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp,
+ arc_buf_t *buf, uint64_t objset, uint64_t object);
+
+static int
+traverse_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg)
+{
+ traverse_data_t *td = arg;
+ zbookmark_t zb;
+
+ if (bp->blk_birth == 0)
+ return (0);
+
+ if (claim_txg == 0 && bp->blk_birth >= spa_first_txg(td->td_spa))
+ return (0);
+
+ SET_BOOKMARK(&zb, td->td_objset, ZB_ZIL_OBJECT, ZB_ZIL_LEVEL,
+ bp->blk_cksum.zc_word[ZIL_ZC_SEQ]);
+
+ (void) td->td_func(td->td_spa, zilog, bp, NULL, &zb, NULL, td->td_arg);
+
+ return (0);
+}
+
+static int
+traverse_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg)
+{
+ traverse_data_t *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 (0);
+
+ if (claim_txg == 0 || bp->blk_birth < claim_txg)
+ return (0);
+
+ SET_BOOKMARK(&zb, td->td_objset, lr->lr_foid,
+ ZB_ZIL_LEVEL, lr->lr_offset / BP_GET_LSIZE(bp));
+
+ (void) td->td_func(td->td_spa, zilog, bp, NULL, &zb, NULL,
+ td->td_arg);
+ }
+ return (0);
+}
+
+static void
+traverse_zil(traverse_data_t *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; plus, in read-only mode, blocks that are already stable.
+ */
+ 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);
+}
+
+typedef enum resume_skip {
+ RESUME_SKIP_ALL,
+ RESUME_SKIP_NONE,
+ RESUME_SKIP_CHILDREN
+} resume_skip_t;
+
+/*
+ * Returns RESUME_SKIP_ALL if td indicates that we are resuming a traversal and
+ * the block indicated by zb does not need to be visited at all. Returns
+ * RESUME_SKIP_CHILDREN if we are resuming a post traversal and we reach the
+ * resume point. This indicates that this block should be visited but not its
+ * children (since they must have been visited in a previous traversal).
+ * Otherwise returns RESUME_SKIP_NONE.
+ */
+static resume_skip_t
+resume_skip_check(traverse_data_t *td, const dnode_phys_t *dnp,
+ const zbookmark_t *zb)
+{
+ if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume)) {
+ /*
+ * If we already visited this bp & everything below,
+ * don't bother doing it again.
+ */
+ if (zbookmark_is_before(dnp, zb, td->td_resume))
+ return (RESUME_SKIP_ALL);
+
+ /*
+ * If we found the block we're trying to resume from, zero
+ * the bookmark out to indicate that we have resumed.
+ */
+ ASSERT3U(zb->zb_object, <=, td->td_resume->zb_object);
+ if (bcmp(zb, td->td_resume, sizeof (*zb)) == 0) {
+ bzero(td->td_resume, sizeof (*zb));
+ if (td->td_flags & TRAVERSE_POST)
+ return (RESUME_SKIP_CHILDREN);
+ }
+ }
+ return (RESUME_SKIP_NONE);
+}
+
+static void
+traverse_pause(traverse_data_t *td, const zbookmark_t *zb)
+{
+ ASSERT(td->td_resume != NULL);
+ ASSERT3U(zb->zb_level, ==, 0);
+ bcopy(zb, td->td_resume, sizeof (*td->td_resume));
+}
+
+static int
+traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp,
+ arc_buf_t *pbuf, blkptr_t *bp, const zbookmark_t *zb)
+{
+ zbookmark_t czb;
+ int err = 0, lasterr = 0;
+ arc_buf_t *buf = NULL;
+ prefetch_data_t *pd = td->td_pfd;
+ boolean_t hard = td->td_flags & TRAVERSE_HARD;
+ boolean_t pause = B_FALSE;
+
+ switch (resume_skip_check(td, dnp, zb)) {
+ case RESUME_SKIP_ALL:
+ return (0);
+ case RESUME_SKIP_CHILDREN:
+ goto post;
+ case RESUME_SKIP_NONE:
+ break;
+ default:
+ ASSERT(0);
+ }
+
+ if (BP_IS_HOLE(bp)) {
+ err = td->td_func(td->td_spa, NULL, NULL, pbuf, 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, NULL, bp, pbuf, zb, dnp,
+ td->td_arg);
+ if (err == TRAVERSE_VISIT_NO_CHILDREN)
+ return (0);
+ if (err == ERESTART)
+ pause = B_TRUE; /* handle pausing at a common point */
+ if (err != 0)
+ goto post;
+ }
+
+ 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 = dsl_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) {
+ if (!hard)
+ break;
+ lasterr = err;
+ }
+ }
+ } 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 = dsl_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; i++, dnp++) {
+ err = traverse_dnode(td, dnp, buf, zb->zb_objset,
+ zb->zb_blkid * epb + i);
+ if (err) {
+ if (!hard)
+ break;
+ lasterr = err;
+ }
+ }
+ } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) {
+ uint32_t flags = ARC_WAIT;
+ objset_phys_t *osp;
+ dnode_phys_t *dnp;
+
+ err = dsl_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;
+ dnp = &osp->os_meta_dnode;
+ err = traverse_dnode(td, dnp, buf, zb->zb_objset,
+ DMU_META_DNODE_OBJECT);
+ if (err && hard) {
+ lasterr = err;
+ err = 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 && hard) {
+ lasterr = err;
+ err = 0;
+ }
+ 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);
+
+post:
+ if (err == 0 && lasterr == 0 && (td->td_flags & TRAVERSE_POST)) {
+ err = td->td_func(td->td_spa, NULL, bp, pbuf, zb, dnp,
+ td->td_arg);
+ if (err == ERESTART)
+ pause = B_TRUE;
+ }
+
+ if (pause && td->td_resume != NULL) {
+ ASSERT3U(err, ==, ERESTART);
+ ASSERT(!hard);
+ traverse_pause(td, zb);
+ }
+
+ return (err != 0 ? err : lasterr);
+}
+
+static int
+traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp,
+ arc_buf_t *buf, uint64_t objset, uint64_t object)
+{
+ int j, err = 0, lasterr = 0;
+ zbookmark_t czb;
+ boolean_t hard = (td->td_flags & TRAVERSE_HARD);
+
+ 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) {
+ if (!hard)
+ break;
+ lasterr = err;
+ }
+ }
+
+ if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) {
+ SET_BOOKMARK(&czb, objset,
+ object, 0, DMU_SPILL_BLKID);
+ err = traverse_visitbp(td, dnp, buf,
+ (blkptr_t *)&dnp->dn_spill, &czb);
+ if (err) {
+ if (!hard)
+ return (err);
+ lasterr = err;
+ }
+ }
+ return (err != 0 ? err : lasterr);
+}
+
+/* ARGSUSED */
+static int
+traverse_prefetcher(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)
+{
+ prefetch_data_t *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) ||
+ BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG)
+ 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) dsl_read(NULL, spa, bp, pbuf, NULL, NULL,
+ ZIO_PRIORITY_ASYNC_READ,
+ ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE,
+ &aflags, zb);
+
+ return (0);
+}
+
+static void
+traverse_prefetch_thread(void *arg)
+{
+ traverse_data_t *td_main = arg;
+ traverse_data_t 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,
+ ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
+ (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, dsl_dataset_t *ds, uint64_t objset, blkptr_t *rootbp,
+ uint64_t txg_start, zbookmark_t *resume, int flags,
+ blkptr_cb_t func, void *arg)
+{
+ traverse_data_t td;
+ prefetch_data_t pd = { 0 };
+ zbookmark_t czb;
+ int err;
+
+ ASSERT(ds == NULL || objset == ds->ds_object);
+ ASSERT(!(flags & TRAVERSE_PRE) || !(flags & TRAVERSE_POST));
+
+ td.td_spa = spa;
+ td.td_objset = objset;
+ td.td_rootbp = rootbp;
+ td.td_min_txg = txg_start;
+ td.td_resume = resume;
+ td.td_func = func;
+ td.td_arg = arg;
+ td.td_pfd = &pd;
+ td.td_flags = flags;
+
+ pd.pd_blks_max = zfs_pd_blks_max;
+ pd.pd_flags = flags;
+ mutex_init(&pd.pd_mtx, NULL, MUTEX_DEFAULT, NULL);
+ cv_init(&pd.pd_cv, NULL, CV_DEFAULT, NULL);
+
+ /* See comment on ZIL traversal in dsl_scan_visitds. */
+ if (ds != NULL && !dsl_dataset_is_snapshot(ds)) {
+ objset_t *os;
+
+ err = dmu_objset_from_ds(ds, &os);
+ if (err)
+ return (err);
+
+ traverse_zil(&td, &os->os_zil_header);
+ }
+
+ if (!(flags & TRAVERSE_PREFETCH) ||
+ 0 == taskq_dispatch(system_taskq, traverse_prefetch_thread,
+ &td, TQ_NOQUEUE))
+ pd.pd_exited = B_TRUE;
+
+ SET_BOOKMARK(&czb, td.td_objset,
+ ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
+ 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->ds_object,
+ &ds->ds_phys->ds_bp, txg_start, NULL, flags, func, arg));
+}
+
+int
+traverse_dataset_destroyed(spa_t *spa, blkptr_t *blkptr,
+ uint64_t txg_start, zbookmark_t *resume, int flags,
+ blkptr_cb_t func, void *arg)
+{
+ return (traverse_impl(spa, NULL, ZB_DESTROYED_OBJSET,
+ blkptr, txg_start, resume, flags, func, arg));
+}
+
+/*
+ * NB: pool must not be changing on-disk (eg, from zdb or sync context).
+ */
+int
+traverse_pool(spa_t *spa, uint64_t txg_start, int flags,
+ blkptr_cb_t func, void *arg)
+{
+ int err, lasterr = 0;
+ uint64_t obj;
+ dsl_pool_t *dp = spa_get_dsl(spa);
+ objset_t *mos = dp->dp_meta_objset;
+ boolean_t hard = (flags & TRAVERSE_HARD);
+
+ /* visit the MOS */
+ err = traverse_impl(spa, NULL, 0, spa_get_rootblkptr(spa),
+ txg_start, NULL, flags, func, arg);
+ if (err)
+ return (err);
+
+ /* visit each dataset */
+ for (obj = 1; err == 0 || (err != ESRCH && hard);
+ err = dmu_object_next(mos, &obj, FALSE, txg_start)) {
+ dmu_object_info_t doi;
+
+ err = dmu_object_info(mos, obj, &doi);
+ if (err) {
+ if (!hard)
+ return (err);
+ lasterr = err;
+ continue;
+ }
+
+ if (doi.doi_type == DMU_OT_DSL_DATASET) {
+ dsl_dataset_t *ds;
+ uint64_t txg = txg_start;
+
+ 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) {
+ if (!hard)
+ return (err);
+ lasterr = err;
+ continue;
+ }
+ if (ds->ds_phys->ds_prev_snap_txg > txg)
+ txg = ds->ds_phys->ds_prev_snap_txg;
+ err = traverse_dataset(ds, txg, flags, func, arg);
+ dsl_dataset_rele(ds, FTAG);
+ if (err) {
+ if (!hard)
+ return (err);
+ lasterr = err;
+ }
+ }
+ }
+ if (err == ESRCH)
+ err = 0;
+ return (err != 0 ? err : lasterr);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-24 16:42:52 +0000