zfs-builds-mm/zfs-0.8.0/module/zfs/dsl_deadlist.c

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2019-07-06 23:40:11 +02:00
/*
* 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.
* Copyright (c) 2012, 2016 by Delphix. All rights reserved.
* Copyright (c) 2014 Spectra Logic Corporation, 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>
/*
* Deadlist concurrency:
*
* Deadlists can only be modified from the syncing thread.
*
* Except for dsl_deadlist_insert(), it can only be modified with the
* dp_config_rwlock held with RW_WRITER.
*
* The accessors (dsl_deadlist_space() and dsl_deadlist_space_range()) can
* be called concurrently, from open context, with the dl_config_rwlock held
* with RW_READER.
*
* Therefore, we only need to provide locking between dsl_deadlist_insert() and
* the accessors, protecting:
* dl_phys->dl_used,comp,uncomp
* and protecting the dl_tree from being loaded.
* The locking is provided by dl_lock. Note that locking on the bpobj_t
* provides its own locking, and dl_oldfmt is immutable.
*/
static int
dsl_deadlist_compare(const void *arg1, const void *arg2)
{
const dsl_deadlist_entry_t *dle1 = (const dsl_deadlist_entry_t *)arg1;
const dsl_deadlist_entry_t *dle2 = (const dsl_deadlist_entry_t *)arg2;
return (AVL_CMP(dle1->dle_mintxg, dle2->dle_mintxg));
}
static void
dsl_deadlist_load_tree(dsl_deadlist_t *dl)
{
zap_cursor_t zc;
zap_attribute_t za;
ASSERT(MUTEX_HELD(&dl->dl_lock));
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 = zfs_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;
ASSERT(!dsl_deadlist_is_open(dl));
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;
}
boolean_t
dsl_deadlist_is_open(dsl_deadlist_t *dl)
{
return (dl->dl_os != NULL);
}
void
dsl_deadlist_close(dsl_deadlist_t *dl)
{
void *cookie = NULL;
dsl_deadlist_entry_t *dle;
ASSERT(dsl_deadlist_is_open(dl));
mutex_destroy(&dl->dl_lock);
if (dl->dl_oldfmt) {
dl->dl_oldfmt = B_FALSE;
bpobj_close(&dl->dl_bpobj);
dl->dl_os = NULL;
dl->dl_object = 0;
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);
dl->dl_dbuf = NULL;
dl->dl_phys = NULL;
dl->dl_os = NULL;
dl->dl_object = 0;
}
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_OLD_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)) {
uint64_t obj = za.za_first_integer;
if (obj == dmu_objset_pool(os)->dp_empty_bpobj)
bpobj_decr_empty(os, tx);
else
bpobj_free(os, obj, tx);
}
zap_cursor_fini(&zc);
VERIFY3U(0, ==, dmu_object_free(os, dlobj, tx));
}
static void
dle_enqueue(dsl_deadlist_t *dl, dsl_deadlist_entry_t *dle,
const blkptr_t *bp, dmu_tx_t *tx)
{
ASSERT(MUTEX_HELD(&dl->dl_lock));
if (dle->dle_bpobj.bpo_object ==
dmu_objset_pool(dl->dl_os)->dp_empty_bpobj) {
uint64_t obj = bpobj_alloc(dl->dl_os, SPA_OLD_MAXBLOCKSIZE, tx);
bpobj_close(&dle->dle_bpobj);
bpobj_decr_empty(dl->dl_os, tx);
VERIFY3U(0, ==, bpobj_open(&dle->dle_bpobj, dl->dl_os, obj));
VERIFY3U(0, ==, zap_update_int_key(dl->dl_os, dl->dl_object,
dle->dle_mintxg, obj, tx));
}
bpobj_enqueue(&dle->dle_bpobj, bp, tx);
}
static void
dle_enqueue_subobj(dsl_deadlist_t *dl, dsl_deadlist_entry_t *dle,
uint64_t obj, dmu_tx_t *tx)
{
ASSERT(MUTEX_HELD(&dl->dl_lock));
if (dle->dle_bpobj.bpo_object !=
dmu_objset_pool(dl->dl_os)->dp_empty_bpobj) {
bpobj_enqueue_subobj(&dle->dle_bpobj, obj, tx);
} else {
bpobj_close(&dle->dle_bpobj);
bpobj_decr_empty(dl->dl_os, tx);
VERIFY3U(0, ==, bpobj_open(&dle->dle_bpobj, dl->dl_os, obj));
VERIFY3U(0, ==, zap_update_int_key(dl->dl_os, dl->dl_object,
dle->dle_mintxg, obj, 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;
}
mutex_enter(&dl->dl_lock);
dsl_deadlist_load_tree(dl);
dmu_buf_will_dirty(dl->dl_dbuf, tx);
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);
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);
if (dle == NULL) {
zfs_panic_recover("blkptr at %p has invalid BLK_BIRTH %llu",
bp, (longlong_t)bp->blk_birth);
dle = avl_first(&dl->dl_tree);
}
ASSERT3P(dle, !=, NULL);
dle_enqueue(dl, dle, bp, tx);
mutex_exit(&dl->dl_lock);
}
/*
* 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;
dle = kmem_alloc(sizeof (*dle), KM_SLEEP);
dle->dle_mintxg = mintxg;
mutex_enter(&dl->dl_lock);
dsl_deadlist_load_tree(dl);
obj = bpobj_alloc_empty(dl->dl_os, SPA_OLD_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));
mutex_exit(&dl->dl_lock);
}
/*
* 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;
mutex_enter(&dl->dl_lock);
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);
dle_enqueue_subobj(dl, dle_prev, 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));
mutex_exit(&dl->dl_lock);
}
/*
* 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 = { 0 };
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,
dsl_dataset_phys(ds)->ds_prev_snap_txg, tx);
mrs_obj = dsl_dataset_phys(ds)->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);
}
mutex_enter(&dl->dl_lock);
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_empty(dl->dl_os, SPA_OLD_MAXBLOCKSIZE, tx);
VERIFY3U(0, ==, zap_add_int_key(dl->dl_os, newobj,
dle->dle_mintxg, obj, tx));
}
mutex_exit(&dl->dl_lock);
return (newobj);
}
void
dsl_deadlist_space(dsl_deadlist_t *dl,
uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
{
ASSERT(dsl_deadlist_is_open(dl));
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
* larger than any bp in the deadlist (eg. 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;
dsl_deadlist_entry_t dle_tofind;
avl_index_t where;
if (dl->dl_oldfmt) {
VERIFY3U(0, ==, bpobj_space_range(&dl->dl_bpobj,
mintxg, maxtxg, usedp, compp, uncompp));
return;
}
*usedp = *compp = *uncompp = 0;
mutex_enter(&dl->dl_lock);
dsl_deadlist_load_tree(dl);
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;
}
mutex_exit(&dl->dl_lock);
}
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;
ASSERT(MUTEX_HELD(&dl->dl_lock));
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);
dl->dl_phys->dl_used += used;
dl->dl_phys->dl_comp += comp;
dl->dl_phys->dl_uncomp += uncomp;
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);
dle_enqueue_subobj(dl, dle, 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;
}
mutex_enter(&dl->dl_lock);
for (zap_cursor_init(&zc, dl->dl_os, obj);
zap_cursor_retrieve(&zc, &za) == 0;
zap_cursor_advance(&zc)) {
uint64_t mintxg = zfs_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);
mutex_exit(&dl->dl_lock);
}
/*
* 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);
mutex_enter(&dl->dl_lock);
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));
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;
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;
}
mutex_exit(&dl->dl_lock);
}