freebsd-dev/module/zfs/bpobj.c
Matthew Ahrens d1fada1e6d Illumos #3603, #3604: bobj improvements
3603 panic from bpobj_enqueue_subobj()
3604 zdb should print bpobjs more verbosely
3871 GCC 4.5.3 does not like issue 3604 patch
Reviewed by: Henrik Mattson <henrik.mattson@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Garrett D'Amore <garrett@damore.org>
Approved by: Dan McDonald <danmcd@nexenta.com>

References:
  https://www.illumos.org/issues/3603
  https://www.illumos.org/issues/3604
  https://www.illumos.org/issues/3871
  illumos/illumos-gate@d04756377d

Ported-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1775

Note that the patch from Illumos issue 3871 is not accepted into Illumos
at the time of this writing. It is something that I wrote when porting
this. Documentation is in the Illumos issue.
2013-10-31 14:57:51 -07:00

567 lines
15 KiB
C

/*
* 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) 2013 by Delphix. All rights reserved.
*/
#include <sys/bpobj.h>
#include <sys/zfs_context.h>
#include <sys/refcount.h>
#include <sys/dsl_pool.h>
#include <sys/zfeature.h>
#include <sys/zap.h>
/*
* Return an empty bpobj, preferably the empty dummy one (dp_empty_bpobj).
*/
uint64_t
bpobj_alloc_empty(objset_t *os, int blocksize, dmu_tx_t *tx)
{
zfeature_info_t *empty_bpobj_feat =
&spa_feature_table[SPA_FEATURE_EMPTY_BPOBJ];
spa_t *spa = dmu_objset_spa(os);
dsl_pool_t *dp = dmu_objset_pool(os);
if (spa_feature_is_enabled(spa, empty_bpobj_feat)) {
if (!spa_feature_is_active(spa, empty_bpobj_feat)) {
ASSERT0(dp->dp_empty_bpobj);
dp->dp_empty_bpobj =
bpobj_alloc(os, SPA_MAXBLOCKSIZE, tx);
VERIFY(zap_add(os,
DMU_POOL_DIRECTORY_OBJECT,
DMU_POOL_EMPTY_BPOBJ, sizeof (uint64_t), 1,
&dp->dp_empty_bpobj, tx) == 0);
}
spa_feature_incr(spa, empty_bpobj_feat, tx);
ASSERT(dp->dp_empty_bpobj != 0);
return (dp->dp_empty_bpobj);
} else {
return (bpobj_alloc(os, blocksize, tx));
}
}
void
bpobj_decr_empty(objset_t *os, dmu_tx_t *tx)
{
zfeature_info_t *empty_bpobj_feat =
&spa_feature_table[SPA_FEATURE_EMPTY_BPOBJ];
dsl_pool_t *dp = dmu_objset_pool(os);
spa_feature_decr(dmu_objset_spa(os), empty_bpobj_feat, tx);
if (!spa_feature_is_active(dmu_objset_spa(os), empty_bpobj_feat)) {
VERIFY3U(0, ==, zap_remove(dp->dp_meta_objset,
DMU_POOL_DIRECTORY_OBJECT,
DMU_POOL_EMPTY_BPOBJ, tx));
VERIFY3U(0, ==, dmu_object_free(os, dp->dp_empty_bpobj, tx));
dp->dp_empty_bpobj = 0;
}
}
uint64_t
bpobj_alloc(objset_t *os, int blocksize, dmu_tx_t *tx)
{
int size;
if (spa_version(dmu_objset_spa(os)) < SPA_VERSION_BPOBJ_ACCOUNT)
size = BPOBJ_SIZE_V0;
else if (spa_version(dmu_objset_spa(os)) < SPA_VERSION_DEADLISTS)
size = BPOBJ_SIZE_V1;
else
size = sizeof (bpobj_phys_t);
return (dmu_object_alloc(os, DMU_OT_BPOBJ, blocksize,
DMU_OT_BPOBJ_HDR, size, tx));
}
void
bpobj_free(objset_t *os, uint64_t obj, dmu_tx_t *tx)
{
int64_t i;
bpobj_t bpo;
dmu_object_info_t doi;
int epb;
dmu_buf_t *dbuf = NULL;
ASSERT(obj != dmu_objset_pool(os)->dp_empty_bpobj);
VERIFY3U(0, ==, bpobj_open(&bpo, os, obj));
mutex_enter(&bpo.bpo_lock);
if (!bpo.bpo_havesubobj || bpo.bpo_phys->bpo_subobjs == 0)
goto out;
VERIFY3U(0, ==, dmu_object_info(os, bpo.bpo_phys->bpo_subobjs, &doi));
epb = doi.doi_data_block_size / sizeof (uint64_t);
for (i = bpo.bpo_phys->bpo_num_subobjs - 1; i >= 0; i--) {
uint64_t *objarray;
uint64_t offset, blkoff;
offset = i * sizeof (uint64_t);
blkoff = P2PHASE(i, epb);
if (dbuf == NULL || dbuf->db_offset > offset) {
if (dbuf)
dmu_buf_rele(dbuf, FTAG);
VERIFY3U(0, ==, dmu_buf_hold(os,
bpo.bpo_phys->bpo_subobjs, offset, FTAG, &dbuf, 0));
}
ASSERT3U(offset, >=, dbuf->db_offset);
ASSERT3U(offset, <, dbuf->db_offset + dbuf->db_size);
objarray = dbuf->db_data;
bpobj_free(os, objarray[blkoff], tx);
}
if (dbuf) {
dmu_buf_rele(dbuf, FTAG);
dbuf = NULL;
}
VERIFY3U(0, ==, dmu_object_free(os, bpo.bpo_phys->bpo_subobjs, tx));
out:
mutex_exit(&bpo.bpo_lock);
bpobj_close(&bpo);
VERIFY3U(0, ==, dmu_object_free(os, obj, tx));
}
int
bpobj_open(bpobj_t *bpo, objset_t *os, uint64_t object)
{
dmu_object_info_t doi;
int err;
err = dmu_object_info(os, object, &doi);
if (err)
return (err);
bzero(bpo, sizeof (*bpo));
mutex_init(&bpo->bpo_lock, NULL, MUTEX_DEFAULT, NULL);
ASSERT(bpo->bpo_dbuf == NULL);
ASSERT(bpo->bpo_phys == NULL);
ASSERT(object != 0);
ASSERT3U(doi.doi_type, ==, DMU_OT_BPOBJ);
ASSERT3U(doi.doi_bonus_type, ==, DMU_OT_BPOBJ_HDR);
err = dmu_bonus_hold(os, object, bpo, &bpo->bpo_dbuf);
if (err)
return (err);
bpo->bpo_os = os;
bpo->bpo_object = object;
bpo->bpo_epb = doi.doi_data_block_size >> SPA_BLKPTRSHIFT;
bpo->bpo_havecomp = (doi.doi_bonus_size > BPOBJ_SIZE_V0);
bpo->bpo_havesubobj = (doi.doi_bonus_size > BPOBJ_SIZE_V1);
bpo->bpo_phys = bpo->bpo_dbuf->db_data;
return (0);
}
void
bpobj_close(bpobj_t *bpo)
{
/* Lame workaround for closing a bpobj that was never opened. */
if (bpo->bpo_object == 0)
return;
dmu_buf_rele(bpo->bpo_dbuf, bpo);
if (bpo->bpo_cached_dbuf != NULL)
dmu_buf_rele(bpo->bpo_cached_dbuf, bpo);
bpo->bpo_dbuf = NULL;
bpo->bpo_phys = NULL;
bpo->bpo_cached_dbuf = NULL;
bpo->bpo_object = 0;
mutex_destroy(&bpo->bpo_lock);
}
static int
bpobj_iterate_impl(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx,
boolean_t free)
{
dmu_object_info_t doi;
int epb;
int64_t i;
int err = 0;
dmu_buf_t *dbuf = NULL;
mutex_enter(&bpo->bpo_lock);
if (free)
dmu_buf_will_dirty(bpo->bpo_dbuf, tx);
for (i = bpo->bpo_phys->bpo_num_blkptrs - 1; i >= 0; i--) {
blkptr_t *bparray;
blkptr_t *bp;
uint64_t offset, blkoff;
offset = i * sizeof (blkptr_t);
blkoff = P2PHASE(i, bpo->bpo_epb);
if (dbuf == NULL || dbuf->db_offset > offset) {
if (dbuf)
dmu_buf_rele(dbuf, FTAG);
err = dmu_buf_hold(bpo->bpo_os, bpo->bpo_object, offset,
FTAG, &dbuf, 0);
if (err)
break;
}
ASSERT3U(offset, >=, dbuf->db_offset);
ASSERT3U(offset, <, dbuf->db_offset + dbuf->db_size);
bparray = dbuf->db_data;
bp = &bparray[blkoff];
err = func(arg, bp, tx);
if (err)
break;
if (free) {
bpo->bpo_phys->bpo_bytes -=
bp_get_dsize_sync(dmu_objset_spa(bpo->bpo_os), bp);
ASSERT3S(bpo->bpo_phys->bpo_bytes, >=, 0);
if (bpo->bpo_havecomp) {
bpo->bpo_phys->bpo_comp -= BP_GET_PSIZE(bp);
bpo->bpo_phys->bpo_uncomp -= BP_GET_UCSIZE(bp);
}
bpo->bpo_phys->bpo_num_blkptrs--;
ASSERT3S(bpo->bpo_phys->bpo_num_blkptrs, >=, 0);
}
}
if (dbuf) {
dmu_buf_rele(dbuf, FTAG);
dbuf = NULL;
}
if (free) {
i++;
VERIFY3U(0, ==, dmu_free_range(bpo->bpo_os, bpo->bpo_object,
i * sizeof (blkptr_t), -1ULL, tx));
}
if (err || !bpo->bpo_havesubobj || bpo->bpo_phys->bpo_subobjs == 0)
goto out;
ASSERT(bpo->bpo_havecomp);
err = dmu_object_info(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs, &doi);
if (err) {
mutex_exit(&bpo->bpo_lock);
return (err);
}
epb = doi.doi_data_block_size / sizeof (uint64_t);
for (i = bpo->bpo_phys->bpo_num_subobjs - 1; i >= 0; i--) {
uint64_t *objarray;
uint64_t offset, blkoff;
bpobj_t sublist;
uint64_t used_before, comp_before, uncomp_before;
uint64_t used_after, comp_after, uncomp_after;
offset = i * sizeof (uint64_t);
blkoff = P2PHASE(i, epb);
if (dbuf == NULL || dbuf->db_offset > offset) {
if (dbuf)
dmu_buf_rele(dbuf, FTAG);
err = dmu_buf_hold(bpo->bpo_os,
bpo->bpo_phys->bpo_subobjs, offset, FTAG, &dbuf, 0);
if (err)
break;
}
ASSERT3U(offset, >=, dbuf->db_offset);
ASSERT3U(offset, <, dbuf->db_offset + dbuf->db_size);
objarray = dbuf->db_data;
err = bpobj_open(&sublist, bpo->bpo_os, objarray[blkoff]);
if (err)
break;
if (free) {
err = bpobj_space(&sublist,
&used_before, &comp_before, &uncomp_before);
if (err)
break;
}
err = bpobj_iterate_impl(&sublist, func, arg, tx, free);
if (free) {
VERIFY3U(0, ==, bpobj_space(&sublist,
&used_after, &comp_after, &uncomp_after));
bpo->bpo_phys->bpo_bytes -= used_before - used_after;
ASSERT3S(bpo->bpo_phys->bpo_bytes, >=, 0);
bpo->bpo_phys->bpo_comp -= comp_before - comp_after;
bpo->bpo_phys->bpo_uncomp -=
uncomp_before - uncomp_after;
}
bpobj_close(&sublist);
if (err)
break;
if (free) {
err = dmu_object_free(bpo->bpo_os,
objarray[blkoff], tx);
if (err)
break;
bpo->bpo_phys->bpo_num_subobjs--;
ASSERT3S(bpo->bpo_phys->bpo_num_subobjs, >=, 0);
}
}
if (dbuf) {
dmu_buf_rele(dbuf, FTAG);
dbuf = NULL;
}
if (free) {
VERIFY3U(0, ==, dmu_free_range(bpo->bpo_os,
bpo->bpo_phys->bpo_subobjs,
(i + 1) * sizeof (uint64_t), -1ULL, tx));
}
out:
/* If there are no entries, there should be no bytes. */
ASSERT(bpo->bpo_phys->bpo_num_blkptrs > 0 ||
(bpo->bpo_havesubobj && bpo->bpo_phys->bpo_num_subobjs > 0) ||
bpo->bpo_phys->bpo_bytes == 0);
mutex_exit(&bpo->bpo_lock);
return (err);
}
/*
* Iterate and remove the entries. If func returns nonzero, iteration
* will stop and that entry will not be removed.
*/
int
bpobj_iterate(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx)
{
return (bpobj_iterate_impl(bpo, func, arg, tx, B_TRUE));
}
/*
* Iterate the entries. If func returns nonzero, iteration will stop.
*/
int
bpobj_iterate_nofree(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx)
{
return (bpobj_iterate_impl(bpo, func, arg, tx, B_FALSE));
}
void
bpobj_enqueue_subobj(bpobj_t *bpo, uint64_t subobj, dmu_tx_t *tx)
{
bpobj_t subbpo;
uint64_t used, comp, uncomp, subsubobjs;
ASSERTV(dmu_object_info_t doi);
ASSERT(bpo->bpo_havesubobj);
ASSERT(bpo->bpo_havecomp);
ASSERT(bpo->bpo_object != dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj);
if (subobj == dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj) {
bpobj_decr_empty(bpo->bpo_os, tx);
return;
}
VERIFY3U(0, ==, bpobj_open(&subbpo, bpo->bpo_os, subobj));
VERIFY3U(0, ==, bpobj_space(&subbpo, &used, &comp, &uncomp));
if (used == 0) {
/* No point in having an empty subobj. */
bpobj_close(&subbpo);
bpobj_free(bpo->bpo_os, subobj, tx);
return;
}
dmu_buf_will_dirty(bpo->bpo_dbuf, tx);
if (bpo->bpo_phys->bpo_subobjs == 0) {
bpo->bpo_phys->bpo_subobjs = dmu_object_alloc(bpo->bpo_os,
DMU_OT_BPOBJ_SUBOBJ, SPA_MAXBLOCKSIZE, DMU_OT_NONE, 0, tx);
}
ASSERT0(dmu_object_info(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs, &doi));
ASSERT3U(doi.doi_type, ==, DMU_OT_BPOBJ_SUBOBJ);
mutex_enter(&bpo->bpo_lock);
dmu_write(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs,
bpo->bpo_phys->bpo_num_subobjs * sizeof (subobj),
sizeof (subobj), &subobj, tx);
bpo->bpo_phys->bpo_num_subobjs++;
/*
* If subobj has only one block of subobjs, then move subobj's
* subobjs to bpo's subobj list directly. This reduces
* recursion in bpobj_iterate due to nested subobjs.
*/
subsubobjs = subbpo.bpo_phys->bpo_subobjs;
if (subsubobjs != 0) {
dmu_object_info_t doi;
VERIFY3U(0, ==, dmu_object_info(bpo->bpo_os, subsubobjs, &doi));
if (doi.doi_max_offset == doi.doi_data_block_size) {
dmu_buf_t *subdb;
uint64_t numsubsub = subbpo.bpo_phys->bpo_num_subobjs;
VERIFY3U(0, ==, dmu_buf_hold(bpo->bpo_os, subsubobjs,
0, FTAG, &subdb, 0));
/*
* Make sure that we are not asking dmu_write()
* to write more data than we have in our buffer.
*/
VERIFY3U(subdb->db_size, >=,
numsubsub * sizeof (subobj));
dmu_write(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs,
bpo->bpo_phys->bpo_num_subobjs * sizeof (subobj),
numsubsub * sizeof (subobj), subdb->db_data, tx);
dmu_buf_rele(subdb, FTAG);
bpo->bpo_phys->bpo_num_subobjs += numsubsub;
dmu_buf_will_dirty(subbpo.bpo_dbuf, tx);
subbpo.bpo_phys->bpo_subobjs = 0;
VERIFY3U(0, ==, dmu_object_free(bpo->bpo_os,
subsubobjs, tx));
}
}
bpo->bpo_phys->bpo_bytes += used;
bpo->bpo_phys->bpo_comp += comp;
bpo->bpo_phys->bpo_uncomp += uncomp;
mutex_exit(&bpo->bpo_lock);
bpobj_close(&subbpo);
}
void
bpobj_enqueue(bpobj_t *bpo, const blkptr_t *bp, dmu_tx_t *tx)
{
blkptr_t stored_bp = *bp;
uint64_t offset;
int blkoff;
blkptr_t *bparray;
ASSERT(!BP_IS_HOLE(bp));
ASSERT(bpo->bpo_object != dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj);
/* We never need the fill count. */
stored_bp.blk_fill = 0;
/* The bpobj will compress better if we can leave off the checksum */
if (!BP_GET_DEDUP(bp))
bzero(&stored_bp.blk_cksum, sizeof (stored_bp.blk_cksum));
mutex_enter(&bpo->bpo_lock);
offset = bpo->bpo_phys->bpo_num_blkptrs * sizeof (stored_bp);
blkoff = P2PHASE(bpo->bpo_phys->bpo_num_blkptrs, bpo->bpo_epb);
if (bpo->bpo_cached_dbuf == NULL ||
offset < bpo->bpo_cached_dbuf->db_offset ||
offset >= bpo->bpo_cached_dbuf->db_offset +
bpo->bpo_cached_dbuf->db_size) {
if (bpo->bpo_cached_dbuf)
dmu_buf_rele(bpo->bpo_cached_dbuf, bpo);
VERIFY3U(0, ==, dmu_buf_hold(bpo->bpo_os, bpo->bpo_object,
offset, bpo, &bpo->bpo_cached_dbuf, 0));
}
dmu_buf_will_dirty(bpo->bpo_cached_dbuf, tx);
bparray = bpo->bpo_cached_dbuf->db_data;
bparray[blkoff] = stored_bp;
dmu_buf_will_dirty(bpo->bpo_dbuf, tx);
bpo->bpo_phys->bpo_num_blkptrs++;
bpo->bpo_phys->bpo_bytes +=
bp_get_dsize_sync(dmu_objset_spa(bpo->bpo_os), bp);
if (bpo->bpo_havecomp) {
bpo->bpo_phys->bpo_comp += BP_GET_PSIZE(bp);
bpo->bpo_phys->bpo_uncomp += BP_GET_UCSIZE(bp);
}
mutex_exit(&bpo->bpo_lock);
}
struct space_range_arg {
spa_t *spa;
uint64_t mintxg;
uint64_t maxtxg;
uint64_t used;
uint64_t comp;
uint64_t uncomp;
};
/* ARGSUSED */
static int
space_range_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
{
struct space_range_arg *sra = arg;
if (bp->blk_birth > sra->mintxg && bp->blk_birth <= sra->maxtxg) {
if (dsl_pool_sync_context(spa_get_dsl(sra->spa)))
sra->used += bp_get_dsize_sync(sra->spa, bp);
else
sra->used += bp_get_dsize(sra->spa, bp);
sra->comp += BP_GET_PSIZE(bp);
sra->uncomp += BP_GET_UCSIZE(bp);
}
return (0);
}
int
bpobj_space(bpobj_t *bpo, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
{
mutex_enter(&bpo->bpo_lock);
*usedp = bpo->bpo_phys->bpo_bytes;
if (bpo->bpo_havecomp) {
*compp = bpo->bpo_phys->bpo_comp;
*uncompp = bpo->bpo_phys->bpo_uncomp;
mutex_exit(&bpo->bpo_lock);
return (0);
} else {
mutex_exit(&bpo->bpo_lock);
return (bpobj_space_range(bpo, 0, UINT64_MAX,
usedp, compp, uncompp));
}
}
/*
* Return the amount of space in the bpobj which is:
* mintxg < blk_birth <= maxtxg
*/
int
bpobj_space_range(bpobj_t *bpo, uint64_t mintxg, uint64_t maxtxg,
uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
{
struct space_range_arg sra = { 0 };
int err;
/*
* As an optimization, if they want the whole txg range, just
* get bpo_bytes rather than iterating over the bps.
*/
if (mintxg < TXG_INITIAL && maxtxg == UINT64_MAX && bpo->bpo_havecomp)
return (bpobj_space(bpo, usedp, compp, uncompp));
sra.spa = dmu_objset_spa(bpo->bpo_os);
sra.mintxg = mintxg;
sra.maxtxg = maxtxg;
err = bpobj_iterate_nofree(bpo, space_range_cb, &sra, NULL);
*usedp = sra.used;
*compp = sra.comp;
*uncompp = sra.uncomp;
return (err);
}