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-rw-r--r--uts/common/fs/zfs/dsl_deadlist.c474
1 files changed, 474 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/dsl_deadlist.c b/uts/common/fs/zfs/dsl_deadlist.c
new file mode 100644
index 000000000000..064f8aceb8ee
--- /dev/null
+++ b/uts/common/fs/zfs/dsl_deadlist.c
@@ -0,0 +1,474 @@
+/*
+ * 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) 2010, Oracle and/or its affiliates. All rights reserved.
+ */
+
+#include <sys/dsl_dataset.h>
+#include <sys/dmu.h>
+#include <sys/refcount.h>
+#include <sys/zap.h>
+#include <sys/zfs_context.h>
+#include <sys/dsl_pool.h>
+
+static int
+dsl_deadlist_compare(const void *arg1, const void *arg2)
+{
+ const dsl_deadlist_entry_t *dle1 = arg1;
+ const dsl_deadlist_entry_t *dle2 = arg2;
+
+ if (dle1->dle_mintxg < dle2->dle_mintxg)
+ return (-1);
+ else if (dle1->dle_mintxg > dle2->dle_mintxg)
+ return (+1);
+ else
+ return (0);
+}
+
+static void
+dsl_deadlist_load_tree(dsl_deadlist_t *dl)
+{
+ zap_cursor_t zc;
+ zap_attribute_t za;
+
+ ASSERT(!dl->dl_oldfmt);
+ if (dl->dl_havetree)
+ return;
+
+ avl_create(&dl->dl_tree, dsl_deadlist_compare,
+ sizeof (dsl_deadlist_entry_t),
+ offsetof(dsl_deadlist_entry_t, dle_node));
+ for (zap_cursor_init(&zc, dl->dl_os, dl->dl_object);
+ zap_cursor_retrieve(&zc, &za) == 0;
+ zap_cursor_advance(&zc)) {
+ dsl_deadlist_entry_t *dle = kmem_alloc(sizeof (*dle), KM_SLEEP);
+ dle->dle_mintxg = strtonum(za.za_name, NULL);
+ VERIFY3U(0, ==, bpobj_open(&dle->dle_bpobj, dl->dl_os,
+ za.za_first_integer));
+ avl_add(&dl->dl_tree, dle);
+ }
+ zap_cursor_fini(&zc);
+ dl->dl_havetree = B_TRUE;
+}
+
+void
+dsl_deadlist_open(dsl_deadlist_t *dl, objset_t *os, uint64_t object)
+{
+ dmu_object_info_t doi;
+
+ mutex_init(&dl->dl_lock, NULL, MUTEX_DEFAULT, NULL);
+ dl->dl_os = os;
+ dl->dl_object = object;
+ VERIFY3U(0, ==, dmu_bonus_hold(os, object, dl, &dl->dl_dbuf));
+ dmu_object_info_from_db(dl->dl_dbuf, &doi);
+ if (doi.doi_type == DMU_OT_BPOBJ) {
+ dmu_buf_rele(dl->dl_dbuf, dl);
+ dl->dl_dbuf = NULL;
+ dl->dl_oldfmt = B_TRUE;
+ VERIFY3U(0, ==, bpobj_open(&dl->dl_bpobj, os, object));
+ return;
+ }
+
+ dl->dl_oldfmt = B_FALSE;
+ dl->dl_phys = dl->dl_dbuf->db_data;
+ dl->dl_havetree = B_FALSE;
+}
+
+void
+dsl_deadlist_close(dsl_deadlist_t *dl)
+{
+ void *cookie = NULL;
+ dsl_deadlist_entry_t *dle;
+
+ if (dl->dl_oldfmt) {
+ dl->dl_oldfmt = B_FALSE;
+ bpobj_close(&dl->dl_bpobj);
+ return;
+ }
+
+ if (dl->dl_havetree) {
+ while ((dle = avl_destroy_nodes(&dl->dl_tree, &cookie))
+ != NULL) {
+ bpobj_close(&dle->dle_bpobj);
+ kmem_free(dle, sizeof (*dle));
+ }
+ avl_destroy(&dl->dl_tree);
+ }
+ dmu_buf_rele(dl->dl_dbuf, dl);
+ mutex_destroy(&dl->dl_lock);
+ dl->dl_dbuf = NULL;
+ dl->dl_phys = NULL;
+}
+
+uint64_t
+dsl_deadlist_alloc(objset_t *os, dmu_tx_t *tx)
+{
+ if (spa_version(dmu_objset_spa(os)) < SPA_VERSION_DEADLISTS)
+ return (bpobj_alloc(os, SPA_MAXBLOCKSIZE, tx));
+ return (zap_create(os, DMU_OT_DEADLIST, DMU_OT_DEADLIST_HDR,
+ sizeof (dsl_deadlist_phys_t), tx));
+}
+
+void
+dsl_deadlist_free(objset_t *os, uint64_t dlobj, dmu_tx_t *tx)
+{
+ dmu_object_info_t doi;
+ zap_cursor_t zc;
+ zap_attribute_t za;
+
+ VERIFY3U(0, ==, dmu_object_info(os, dlobj, &doi));
+ if (doi.doi_type == DMU_OT_BPOBJ) {
+ bpobj_free(os, dlobj, tx);
+ return;
+ }
+
+ for (zap_cursor_init(&zc, os, dlobj);
+ zap_cursor_retrieve(&zc, &za) == 0;
+ zap_cursor_advance(&zc))
+ bpobj_free(os, za.za_first_integer, tx);
+ zap_cursor_fini(&zc);
+ VERIFY3U(0, ==, dmu_object_free(os, dlobj, tx));
+}
+
+void
+dsl_deadlist_insert(dsl_deadlist_t *dl, const blkptr_t *bp, dmu_tx_t *tx)
+{
+ dsl_deadlist_entry_t dle_tofind;
+ dsl_deadlist_entry_t *dle;
+ avl_index_t where;
+
+ if (dl->dl_oldfmt) {
+ bpobj_enqueue(&dl->dl_bpobj, bp, tx);
+ return;
+ }
+
+ dsl_deadlist_load_tree(dl);
+
+ dmu_buf_will_dirty(dl->dl_dbuf, tx);
+ mutex_enter(&dl->dl_lock);
+ dl->dl_phys->dl_used +=
+ bp_get_dsize_sync(dmu_objset_spa(dl->dl_os), bp);
+ dl->dl_phys->dl_comp += BP_GET_PSIZE(bp);
+ dl->dl_phys->dl_uncomp += BP_GET_UCSIZE(bp);
+ mutex_exit(&dl->dl_lock);
+
+ dle_tofind.dle_mintxg = bp->blk_birth;
+ dle = avl_find(&dl->dl_tree, &dle_tofind, &where);
+ if (dle == NULL)
+ dle = avl_nearest(&dl->dl_tree, where, AVL_BEFORE);
+ else
+ dle = AVL_PREV(&dl->dl_tree, dle);
+ bpobj_enqueue(&dle->dle_bpobj, bp, tx);
+}
+
+/*
+ * Insert new key in deadlist, which must be > all current entries.
+ * mintxg is not inclusive.
+ */
+void
+dsl_deadlist_add_key(dsl_deadlist_t *dl, uint64_t mintxg, dmu_tx_t *tx)
+{
+ uint64_t obj;
+ dsl_deadlist_entry_t *dle;
+
+ if (dl->dl_oldfmt)
+ return;
+
+ dsl_deadlist_load_tree(dl);
+
+ dle = kmem_alloc(sizeof (*dle), KM_SLEEP);
+ dle->dle_mintxg = mintxg;
+ obj = bpobj_alloc(dl->dl_os, SPA_MAXBLOCKSIZE, tx);
+ VERIFY3U(0, ==, bpobj_open(&dle->dle_bpobj, dl->dl_os, obj));
+ avl_add(&dl->dl_tree, dle);
+
+ VERIFY3U(0, ==, zap_add_int_key(dl->dl_os, dl->dl_object,
+ mintxg, obj, tx));
+}
+
+/*
+ * Remove this key, merging its entries into the previous key.
+ */
+void
+dsl_deadlist_remove_key(dsl_deadlist_t *dl, uint64_t mintxg, dmu_tx_t *tx)
+{
+ dsl_deadlist_entry_t dle_tofind;
+ dsl_deadlist_entry_t *dle, *dle_prev;
+
+ if (dl->dl_oldfmt)
+ return;
+
+ dsl_deadlist_load_tree(dl);
+
+ dle_tofind.dle_mintxg = mintxg;
+ dle = avl_find(&dl->dl_tree, &dle_tofind, NULL);
+ dle_prev = AVL_PREV(&dl->dl_tree, dle);
+
+ bpobj_enqueue_subobj(&dle_prev->dle_bpobj,
+ dle->dle_bpobj.bpo_object, tx);
+
+ avl_remove(&dl->dl_tree, dle);
+ bpobj_close(&dle->dle_bpobj);
+ kmem_free(dle, sizeof (*dle));
+
+ VERIFY3U(0, ==, zap_remove_int(dl->dl_os, dl->dl_object, mintxg, tx));
+}
+
+/*
+ * Walk ds's snapshots to regenerate generate ZAP & AVL.
+ */
+static void
+dsl_deadlist_regenerate(objset_t *os, uint64_t dlobj,
+ uint64_t mrs_obj, dmu_tx_t *tx)
+{
+ dsl_deadlist_t dl;
+ dsl_pool_t *dp = dmu_objset_pool(os);
+
+ dsl_deadlist_open(&dl, os, dlobj);
+ if (dl.dl_oldfmt) {
+ dsl_deadlist_close(&dl);
+ return;
+ }
+
+ while (mrs_obj != 0) {
+ dsl_dataset_t *ds;
+ VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, mrs_obj, FTAG, &ds));
+ dsl_deadlist_add_key(&dl, ds->ds_phys->ds_prev_snap_txg, tx);
+ mrs_obj = ds->ds_phys->ds_prev_snap_obj;
+ dsl_dataset_rele(ds, FTAG);
+ }
+ dsl_deadlist_close(&dl);
+}
+
+uint64_t
+dsl_deadlist_clone(dsl_deadlist_t *dl, uint64_t maxtxg,
+ uint64_t mrs_obj, dmu_tx_t *tx)
+{
+ dsl_deadlist_entry_t *dle;
+ uint64_t newobj;
+
+ newobj = dsl_deadlist_alloc(dl->dl_os, tx);
+
+ if (dl->dl_oldfmt) {
+ dsl_deadlist_regenerate(dl->dl_os, newobj, mrs_obj, tx);
+ return (newobj);
+ }
+
+ dsl_deadlist_load_tree(dl);
+
+ for (dle = avl_first(&dl->dl_tree); dle;
+ dle = AVL_NEXT(&dl->dl_tree, dle)) {
+ uint64_t obj;
+
+ if (dle->dle_mintxg >= maxtxg)
+ break;
+
+ obj = bpobj_alloc(dl->dl_os, SPA_MAXBLOCKSIZE, tx);
+ VERIFY3U(0, ==, zap_add_int_key(dl->dl_os, newobj,
+ dle->dle_mintxg, obj, tx));
+ }
+ return (newobj);
+}
+
+void
+dsl_deadlist_space(dsl_deadlist_t *dl,
+ uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
+{
+ if (dl->dl_oldfmt) {
+ VERIFY3U(0, ==, bpobj_space(&dl->dl_bpobj,
+ usedp, compp, uncompp));
+ return;
+ }
+
+ mutex_enter(&dl->dl_lock);
+ *usedp = dl->dl_phys->dl_used;
+ *compp = dl->dl_phys->dl_comp;
+ *uncompp = dl->dl_phys->dl_uncomp;
+ mutex_exit(&dl->dl_lock);
+}
+
+/*
+ * return space used in the range (mintxg, maxtxg].
+ * Includes maxtxg, does not include mintxg.
+ * mintxg and maxtxg must both be keys in the deadlist (unless maxtxg is
+ * UINT64_MAX).
+ */
+void
+dsl_deadlist_space_range(dsl_deadlist_t *dl, uint64_t mintxg, uint64_t maxtxg,
+ uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
+{
+ dsl_deadlist_entry_t dle_tofind;
+ dsl_deadlist_entry_t *dle;
+ avl_index_t where;
+
+ if (dl->dl_oldfmt) {
+ VERIFY3U(0, ==, bpobj_space_range(&dl->dl_bpobj,
+ mintxg, maxtxg, usedp, compp, uncompp));
+ return;
+ }
+
+ dsl_deadlist_load_tree(dl);
+ *usedp = *compp = *uncompp = 0;
+
+ dle_tofind.dle_mintxg = mintxg;
+ dle = avl_find(&dl->dl_tree, &dle_tofind, &where);
+ /*
+ * If we don't find this mintxg, there shouldn't be anything
+ * after it either.
+ */
+ ASSERT(dle != NULL ||
+ avl_nearest(&dl->dl_tree, where, AVL_AFTER) == NULL);
+ for (; dle && dle->dle_mintxg < maxtxg;
+ dle = AVL_NEXT(&dl->dl_tree, dle)) {
+ uint64_t used, comp, uncomp;
+
+ VERIFY3U(0, ==, bpobj_space(&dle->dle_bpobj,
+ &used, &comp, &uncomp));
+
+ *usedp += used;
+ *compp += comp;
+ *uncompp += uncomp;
+ }
+}
+
+static void
+dsl_deadlist_insert_bpobj(dsl_deadlist_t *dl, uint64_t obj, uint64_t birth,
+ dmu_tx_t *tx)
+{
+ dsl_deadlist_entry_t dle_tofind;
+ dsl_deadlist_entry_t *dle;
+ avl_index_t where;
+ uint64_t used, comp, uncomp;
+ bpobj_t bpo;
+
+ VERIFY3U(0, ==, bpobj_open(&bpo, dl->dl_os, obj));
+ VERIFY3U(0, ==, bpobj_space(&bpo, &used, &comp, &uncomp));
+ bpobj_close(&bpo);
+
+ dsl_deadlist_load_tree(dl);
+
+ dmu_buf_will_dirty(dl->dl_dbuf, tx);
+ mutex_enter(&dl->dl_lock);
+ dl->dl_phys->dl_used += used;
+ dl->dl_phys->dl_comp += comp;
+ dl->dl_phys->dl_uncomp += uncomp;
+ mutex_exit(&dl->dl_lock);
+
+ dle_tofind.dle_mintxg = birth;
+ dle = avl_find(&dl->dl_tree, &dle_tofind, &where);
+ if (dle == NULL)
+ dle = avl_nearest(&dl->dl_tree, where, AVL_BEFORE);
+ bpobj_enqueue_subobj(&dle->dle_bpobj, obj, tx);
+}
+
+static int
+dsl_deadlist_insert_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
+{
+ dsl_deadlist_t *dl = arg;
+ dsl_deadlist_insert(dl, bp, tx);
+ return (0);
+}
+
+/*
+ * Merge the deadlist pointed to by 'obj' into dl. obj will be left as
+ * an empty deadlist.
+ */
+void
+dsl_deadlist_merge(dsl_deadlist_t *dl, uint64_t obj, dmu_tx_t *tx)
+{
+ zap_cursor_t zc;
+ zap_attribute_t za;
+ dmu_buf_t *bonus;
+ dsl_deadlist_phys_t *dlp;
+ dmu_object_info_t doi;
+
+ VERIFY3U(0, ==, dmu_object_info(dl->dl_os, obj, &doi));
+ if (doi.doi_type == DMU_OT_BPOBJ) {
+ bpobj_t bpo;
+ VERIFY3U(0, ==, bpobj_open(&bpo, dl->dl_os, obj));
+ VERIFY3U(0, ==, bpobj_iterate(&bpo,
+ dsl_deadlist_insert_cb, dl, tx));
+ bpobj_close(&bpo);
+ return;
+ }
+
+ for (zap_cursor_init(&zc, dl->dl_os, obj);
+ zap_cursor_retrieve(&zc, &za) == 0;
+ zap_cursor_advance(&zc)) {
+ uint64_t mintxg = strtonum(za.za_name, NULL);
+ dsl_deadlist_insert_bpobj(dl, za.za_first_integer, mintxg, tx);
+ VERIFY3U(0, ==, zap_remove_int(dl->dl_os, obj, mintxg, tx));
+ }
+ zap_cursor_fini(&zc);
+
+ VERIFY3U(0, ==, dmu_bonus_hold(dl->dl_os, obj, FTAG, &bonus));
+ dlp = bonus->db_data;
+ dmu_buf_will_dirty(bonus, tx);
+ bzero(dlp, sizeof (*dlp));
+ dmu_buf_rele(bonus, FTAG);
+}
+
+/*
+ * Remove entries on dl that are >= mintxg, and put them on the bpobj.
+ */
+void
+dsl_deadlist_move_bpobj(dsl_deadlist_t *dl, bpobj_t *bpo, uint64_t mintxg,
+ dmu_tx_t *tx)
+{
+ dsl_deadlist_entry_t dle_tofind;
+ dsl_deadlist_entry_t *dle;
+ avl_index_t where;
+
+ ASSERT(!dl->dl_oldfmt);
+ dmu_buf_will_dirty(dl->dl_dbuf, tx);
+ dsl_deadlist_load_tree(dl);
+
+ dle_tofind.dle_mintxg = mintxg;
+ dle = avl_find(&dl->dl_tree, &dle_tofind, &where);
+ if (dle == NULL)
+ dle = avl_nearest(&dl->dl_tree, where, AVL_AFTER);
+ while (dle) {
+ uint64_t used, comp, uncomp;
+ dsl_deadlist_entry_t *dle_next;
+
+ bpobj_enqueue_subobj(bpo, dle->dle_bpobj.bpo_object, tx);
+
+ VERIFY3U(0, ==, bpobj_space(&dle->dle_bpobj,
+ &used, &comp, &uncomp));
+ mutex_enter(&dl->dl_lock);
+ ASSERT3U(dl->dl_phys->dl_used, >=, used);
+ ASSERT3U(dl->dl_phys->dl_comp, >=, comp);
+ ASSERT3U(dl->dl_phys->dl_uncomp, >=, uncomp);
+ dl->dl_phys->dl_used -= used;
+ dl->dl_phys->dl_comp -= comp;
+ dl->dl_phys->dl_uncomp -= uncomp;
+ mutex_exit(&dl->dl_lock);
+
+ VERIFY3U(0, ==, zap_remove_int(dl->dl_os, dl->dl_object,
+ dle->dle_mintxg, tx));
+
+ dle_next = AVL_NEXT(&dl->dl_tree, dle);
+ avl_remove(&dl->dl_tree, dle);
+ bpobj_close(&dle->dle_bpobj);
+ kmem_free(dle, sizeof (*dle));
+ dle = dle_next;
+ }
+}