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mirror_zfs/module/zfs/dsl_dataset.c
Richard Yao 6a42939fcd
Cleanup: Address Clang's static analyzer's unused code complaints 
These were categorized as the following:

 * Dead assignment		23
 * Dead increment		4
 * Dead initialization		6
 * Dead nested assignment	18

Most of these are harmless, but since actual issues can hide among them,
we correct them.

That said, there were a few return values that were being ignored that
appeared to merit some correction:

 * `destroy_callback()` in `cmd/zfs/zfs_main.c` ignored the error from
   `destroy_batched()`. We handle it by returning -1 if there is an
   error.

 * `zfs_do_upgrade()` in `cmd/zfs/zfs_main.c` ignored the error from
   `zfs_for_each()`. We handle it by doing a binary OR of the error
   value from the subsequent `zfs_for_each()` call to the existing
   value. This is how errors are mostly handled inside `zfs_for_each()`.
   The error value here is passed to exit from the zfs command, so doing
   a binary or on it is better than what we did previously.

 * `get_zap_prop()` in `module/zfs/zcp_get.c` ignored the error from
   `dsl_prop_get_ds()` when the property is not of type string. We
   return an error when it does. There is a small concern that the
   `zfs_get_temporary_prop()` call would handle things, but in the case
   that it does not, we would be pushing an uninitialized numval onto
   the lua stack. It is expected that `dsl_prop_get_ds()` will succeed
   anytime that `zfs_get_temporary_prop()` does, so that not giving it a
   chance to fix things is not a problem.

 * `draid_merge_impl()` in `tests/zfs-tests/cmd/draid.c` used
   `nvlist_add_nvlist()` twice in ways in which errors are expected to
   be impossible, so we switch to `fnvlist_add_nvlist()`.

A few notable ones did not merit use of the return value, so we
suppressed it with `(void)`:

 * `write_free_diffs()` in `lib/libzfs/libzfs_diff.c` ignored the error
   value from `describe_free()`. A look through the commit history
   revealed that this was intentional.

 * `arc_evict_hdr()` in `module/zfs/arc.c` did not need to use the
   returned handle from `arc_hdr_realloc()` because it is already
   referenced in lists.

 * `spa_vdev_detach()` in `module/zfs/spa.c` has a comment explicitly
   saying not to use the error from `vdev_label_init()` because whatever
   causes the error could be the reason why a detach is being done.

Unfortunately, I am not presently able to analyze the kernel modules
with Clang's static analyzer, so I could have missed some cases of this.
In cases where reports were present in code that is duplicated between
Linux and FreeBSD, I made a conscious effort to fix the FreeBSD version
too.

After this commit is merged, regressions like dee8934 should become
extremely obvious with Clang's static analyzer since a regression would
appear in the results as the only instance of unused code. That assumes
that Coverity does not catch the issue first.

My local branch with fixes from all of my outstanding non-draft pull
requests shows 118 reports from Clang's static anlayzer after this
patch. That is down by 51 from 169.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Cedric Berger <cedric@precidata.com>
Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Closes #13986
2022-10-14 13:37:54 -07:00

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/*
* 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 https://opensource.org/licenses/CDDL-1.0.
* 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) 2011, 2020 by Delphix. All rights reserved.
* Copyright (c) 2014, Joyent, Inc. All rights reserved.
* Copyright (c) 2014 RackTop Systems.
* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
* Copyright (c) 2016 Actifio, Inc. All rights reserved.
* Copyright 2016, OmniTI Computer Consulting, Inc. All rights reserved.
* Copyright 2017 Nexenta Systems, Inc.
* Copyright (c) 2019, Klara Inc.
* Copyright (c) 2019, Allan Jude
* Copyright (c) 2020 The FreeBSD Foundation [1]
*
* [1] Portions of this software were developed by Allan Jude
* under sponsorship from the FreeBSD Foundation.
*/
#include <sys/dmu_objset.h>
#include <sys/dsl_dataset.h>
#include <sys/dsl_dir.h>
#include <sys/dsl_prop.h>
#include <sys/dsl_synctask.h>
#include <sys/dmu_traverse.h>
#include <sys/dmu_impl.h>
#include <sys/dmu_tx.h>
#include <sys/arc.h>
#include <sys/zio.h>
#include <sys/zap.h>
#include <sys/zfeature.h>
#include <sys/unique.h>
#include <sys/zfs_context.h>
#include <sys/zfs_ioctl.h>
#include <sys/spa.h>
#include <sys/spa_impl.h>
#include <sys/vdev.h>
#include <sys/zfs_znode.h>
#include <sys/zfs_onexit.h>
#include <sys/zvol.h>
#include <sys/dsl_scan.h>
#include <sys/dsl_deadlist.h>
#include <sys/dsl_destroy.h>
#include <sys/dsl_userhold.h>
#include <sys/dsl_bookmark.h>
#include <sys/policy.h>
#include <sys/dmu_send.h>
#include <sys/dmu_recv.h>
#include <sys/zio_compress.h>
#include <zfs_fletcher.h>
#include <sys/zio_checksum.h>
/*
* The SPA supports block sizes up to 16MB. However, very large blocks
* can have an impact on i/o latency (e.g. tying up a spinning disk for
* ~300ms), and also potentially on the memory allocator. Therefore,
* we did not allow the recordsize to be set larger than zfs_max_recordsize
* (former default: 1MB). Larger blocks could be created by changing this
* tunable, and pools with larger blocks could always be imported and used,
* regardless of this setting.
*
* We do, however, still limit it by default to 1M on x86_32, because Linux's
* 3/1 memory split doesn't leave much room for 16M chunks.
*/
#ifdef _ILP32
uint_t zfs_max_recordsize = 1 * 1024 * 1024;
#else
uint_t zfs_max_recordsize = 16 * 1024 * 1024;
#endif
static int zfs_allow_redacted_dataset_mount = 0;
int zfs_snapshot_history_enabled = 1;
#define SWITCH64(x, y) \
{ \
uint64_t __tmp = (x); \
(x) = (y); \
(y) = __tmp; \
}
#define DS_REF_MAX (1ULL << 62)
static void dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds,
uint64_t obj, dmu_tx_t *tx);
static void dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds,
dmu_tx_t *tx);
static void unload_zfeature(dsl_dataset_t *ds, spa_feature_t f);
extern uint_t spa_asize_inflation;
static zil_header_t zero_zil;
/*
* Figure out how much of this delta should be propagated to the dsl_dir
* layer. If there's a refreservation, that space has already been
* partially accounted for in our ancestors.
*/
static int64_t
parent_delta(dsl_dataset_t *ds, int64_t delta)
{
dsl_dataset_phys_t *ds_phys;
uint64_t old_bytes, new_bytes;
if (ds->ds_reserved == 0)
return (delta);
ds_phys = dsl_dataset_phys(ds);
old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved);
new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved);
ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta));
return (new_bytes - old_bytes);
}
void
dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx)
{
spa_t *spa = dmu_tx_pool(tx)->dp_spa;
int used = bp_get_dsize_sync(spa, bp);
int compressed = BP_GET_PSIZE(bp);
int uncompressed = BP_GET_UCSIZE(bp);
int64_t delta;
spa_feature_t f;
dprintf_bp(bp, "ds=%p", ds);
ASSERT(dmu_tx_is_syncing(tx));
/* It could have been compressed away to nothing */
if (BP_IS_HOLE(bp) || BP_IS_REDACTED(bp))
return;
ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE);
ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp)));
if (ds == NULL) {
dsl_pool_mos_diduse_space(tx->tx_pool,
used, compressed, uncompressed);
return;
}
ASSERT3U(bp->blk_birth, >, dsl_dataset_phys(ds)->ds_prev_snap_txg);
dmu_buf_will_dirty(ds->ds_dbuf, tx);
mutex_enter(&ds->ds_lock);
delta = parent_delta(ds, used);
dsl_dataset_phys(ds)->ds_referenced_bytes += used;
dsl_dataset_phys(ds)->ds_compressed_bytes += compressed;
dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed;
dsl_dataset_phys(ds)->ds_unique_bytes += used;
if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) {
ds->ds_feature_activation[SPA_FEATURE_LARGE_BLOCKS] =
(void *)B_TRUE;
}
f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp));
if (f != SPA_FEATURE_NONE) {
ASSERT3S(spa_feature_table[f].fi_type, ==,
ZFEATURE_TYPE_BOOLEAN);
ds->ds_feature_activation[f] = (void *)B_TRUE;
}
f = zio_compress_to_feature(BP_GET_COMPRESS(bp));
if (f != SPA_FEATURE_NONE) {
ASSERT3S(spa_feature_table[f].fi_type, ==,
ZFEATURE_TYPE_BOOLEAN);
ds->ds_feature_activation[f] = (void *)B_TRUE;
}
/*
* Track block for livelist, but ignore embedded blocks because
* they do not need to be freed.
*/
if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist) &&
bp->blk_birth > ds->ds_dir->dd_origin_txg &&
!(BP_IS_EMBEDDED(bp))) {
ASSERT(dsl_dir_is_clone(ds->ds_dir));
ASSERT(spa_feature_is_enabled(spa,
SPA_FEATURE_LIVELIST));
bplist_append(&ds->ds_dir->dd_pending_allocs, bp);
}
mutex_exit(&ds->ds_lock);
dsl_dir_diduse_transfer_space(ds->ds_dir, delta,
compressed, uncompressed, used,
DD_USED_REFRSRV, DD_USED_HEAD, tx);
}
/*
* Called when the specified segment has been remapped, and is thus no
* longer referenced in the head dataset. The vdev must be indirect.
*
* If the segment is referenced by a snapshot, put it on the remap deadlist.
* Otherwise, add this segment to the obsolete spacemap.
*/
void
dsl_dataset_block_remapped(dsl_dataset_t *ds, uint64_t vdev, uint64_t offset,
uint64_t size, uint64_t birth, dmu_tx_t *tx)
{
spa_t *spa = ds->ds_dir->dd_pool->dp_spa;
ASSERT(dmu_tx_is_syncing(tx));
ASSERT(birth <= tx->tx_txg);
ASSERT(!ds->ds_is_snapshot);
if (birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
spa_vdev_indirect_mark_obsolete(spa, vdev, offset, size, tx);
} else {
blkptr_t fakebp;
dva_t *dva = &fakebp.blk_dva[0];
ASSERT(ds != NULL);
mutex_enter(&ds->ds_remap_deadlist_lock);
if (!dsl_dataset_remap_deadlist_exists(ds)) {
dsl_dataset_create_remap_deadlist(ds, tx);
}
mutex_exit(&ds->ds_remap_deadlist_lock);
BP_ZERO(&fakebp);
fakebp.blk_birth = birth;
DVA_SET_VDEV(dva, vdev);
DVA_SET_OFFSET(dva, offset);
DVA_SET_ASIZE(dva, size);
dsl_deadlist_insert(&ds->ds_remap_deadlist, &fakebp, B_FALSE,
tx);
}
}
int
dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx,
boolean_t async)
{
spa_t *spa = dmu_tx_pool(tx)->dp_spa;
int used = bp_get_dsize_sync(spa, bp);
int compressed = BP_GET_PSIZE(bp);
int uncompressed = BP_GET_UCSIZE(bp);
if (BP_IS_HOLE(bp) || BP_IS_REDACTED(bp))
return (0);
ASSERT(dmu_tx_is_syncing(tx));
ASSERT(bp->blk_birth <= tx->tx_txg);
if (ds == NULL) {
dsl_free(tx->tx_pool, tx->tx_txg, bp);
dsl_pool_mos_diduse_space(tx->tx_pool,
-used, -compressed, -uncompressed);
return (used);
}
ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool);
ASSERT(!ds->ds_is_snapshot);
dmu_buf_will_dirty(ds->ds_dbuf, tx);
/*
* Track block for livelist, but ignore embedded blocks because
* they do not need to be freed.
*/
if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist) &&
bp->blk_birth > ds->ds_dir->dd_origin_txg &&
!(BP_IS_EMBEDDED(bp))) {
ASSERT(dsl_dir_is_clone(ds->ds_dir));
ASSERT(spa_feature_is_enabled(spa,
SPA_FEATURE_LIVELIST));
bplist_append(&ds->ds_dir->dd_pending_frees, bp);
}
if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
int64_t delta;
dprintf_bp(bp, "freeing ds=%llu", (u_longlong_t)ds->ds_object);
dsl_free(tx->tx_pool, tx->tx_txg, bp);
mutex_enter(&ds->ds_lock);
ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used ||
!DS_UNIQUE_IS_ACCURATE(ds));
delta = parent_delta(ds, -used);
dsl_dataset_phys(ds)->ds_unique_bytes -= used;
mutex_exit(&ds->ds_lock);
dsl_dir_diduse_transfer_space(ds->ds_dir,
delta, -compressed, -uncompressed, -used,
DD_USED_REFRSRV, DD_USED_HEAD, tx);
} else {
dprintf_bp(bp, "putting on dead list: %s", "");
if (async) {
/*
* We are here as part of zio's write done callback,
* which means we're a zio interrupt thread. We can't
* call dsl_deadlist_insert() now because it may block
* waiting for I/O. Instead, put bp on the deferred
* queue and let dsl_pool_sync() finish the job.
*/
bplist_append(&ds->ds_pending_deadlist, bp);
} else {
dsl_deadlist_insert(&ds->ds_deadlist, bp, B_FALSE, tx);
}
ASSERT3U(ds->ds_prev->ds_object, ==,
dsl_dataset_phys(ds)->ds_prev_snap_obj);
ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0);
/* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
ds->ds_object && bp->blk_birth >
dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) {
dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
mutex_enter(&ds->ds_prev->ds_lock);
dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used;
mutex_exit(&ds->ds_prev->ds_lock);
}
if (bp->blk_birth > ds->ds_dir->dd_origin_txg) {
dsl_dir_transfer_space(ds->ds_dir, used,
DD_USED_HEAD, DD_USED_SNAP, tx);
}
}
dsl_bookmark_block_killed(ds, bp, tx);
mutex_enter(&ds->ds_lock);
ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used);
dsl_dataset_phys(ds)->ds_referenced_bytes -= used;
ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed);
dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed;
ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed);
dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed;
mutex_exit(&ds->ds_lock);
return (used);
}
struct feature_type_uint64_array_arg {
uint64_t length;
uint64_t *array;
};
static void
unload_zfeature(dsl_dataset_t *ds, spa_feature_t f)
{
switch (spa_feature_table[f].fi_type) {
case ZFEATURE_TYPE_BOOLEAN:
break;
case ZFEATURE_TYPE_UINT64_ARRAY:
{
struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f];
kmem_free(ftuaa->array, ftuaa->length * sizeof (uint64_t));
kmem_free(ftuaa, sizeof (*ftuaa));
break;
}
default:
panic("Invalid zfeature type %d", spa_feature_table[f].fi_type);
}
}
static int
load_zfeature(objset_t *mos, dsl_dataset_t *ds, spa_feature_t f)
{
int err = 0;
switch (spa_feature_table[f].fi_type) {
case ZFEATURE_TYPE_BOOLEAN:
err = zap_contains(mos, ds->ds_object,
spa_feature_table[f].fi_guid);
if (err == 0) {
ds->ds_feature[f] = (void *)B_TRUE;
} else {
ASSERT3U(err, ==, ENOENT);
err = 0;
}
break;
case ZFEATURE_TYPE_UINT64_ARRAY:
{
uint64_t int_size, num_int;
uint64_t *data;
err = zap_length(mos, ds->ds_object,
spa_feature_table[f].fi_guid, &int_size, &num_int);
if (err != 0) {
ASSERT3U(err, ==, ENOENT);
err = 0;
break;
}
ASSERT3U(int_size, ==, sizeof (uint64_t));
data = kmem_alloc(int_size * num_int, KM_SLEEP);
VERIFY0(zap_lookup(mos, ds->ds_object,
spa_feature_table[f].fi_guid, int_size, num_int, data));
struct feature_type_uint64_array_arg *ftuaa =
kmem_alloc(sizeof (*ftuaa), KM_SLEEP);
ftuaa->length = num_int;
ftuaa->array = data;
ds->ds_feature[f] = ftuaa;
break;
}
default:
panic("Invalid zfeature type %d", spa_feature_table[f].fi_type);
}
return (err);
}
/*
* We have to release the fsid synchronously or we risk that a subsequent
* mount of the same dataset will fail to unique_insert the fsid. This
* failure would manifest itself as the fsid of this dataset changing
* between mounts which makes NFS clients quite unhappy.
*/
static void
dsl_dataset_evict_sync(void *dbu)
{
dsl_dataset_t *ds = dbu;
ASSERT(ds->ds_owner == NULL);
unique_remove(ds->ds_fsid_guid);
}
static void
dsl_dataset_evict_async(void *dbu)
{
dsl_dataset_t *ds = dbu;
ASSERT(ds->ds_owner == NULL);
ds->ds_dbuf = NULL;
if (ds->ds_objset != NULL)
dmu_objset_evict(ds->ds_objset);
if (ds->ds_prev) {
dsl_dataset_rele(ds->ds_prev, ds);
ds->ds_prev = NULL;
}
dsl_bookmark_fini_ds(ds);
bplist_destroy(&ds->ds_pending_deadlist);
if (dsl_deadlist_is_open(&ds->ds_deadlist))
dsl_deadlist_close(&ds->ds_deadlist);
if (dsl_deadlist_is_open(&ds->ds_remap_deadlist))
dsl_deadlist_close(&ds->ds_remap_deadlist);
if (ds->ds_dir)
dsl_dir_async_rele(ds->ds_dir, ds);
ASSERT(!list_link_active(&ds->ds_synced_link));
for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
if (dsl_dataset_feature_is_active(ds, f))
unload_zfeature(ds, f);
}
list_destroy(&ds->ds_prop_cbs);
mutex_destroy(&ds->ds_lock);
mutex_destroy(&ds->ds_opening_lock);
mutex_destroy(&ds->ds_sendstream_lock);
mutex_destroy(&ds->ds_remap_deadlist_lock);
zfs_refcount_destroy(&ds->ds_longholds);
rrw_destroy(&ds->ds_bp_rwlock);
kmem_free(ds, sizeof (dsl_dataset_t));
}
int
dsl_dataset_get_snapname(dsl_dataset_t *ds)
{
dsl_dataset_phys_t *headphys;
int err;
dmu_buf_t *headdbuf;
dsl_pool_t *dp = ds->ds_dir->dd_pool;
objset_t *mos = dp->dp_meta_objset;
if (ds->ds_snapname[0])
return (0);
if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0)
return (0);
err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj,
FTAG, &headdbuf);
if (err != 0)
return (err);
headphys = headdbuf->db_data;
err = zap_value_search(dp->dp_meta_objset,
headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname);
if (err != 0 && zfs_recover == B_TRUE) {
err = 0;
(void) snprintf(ds->ds_snapname, sizeof (ds->ds_snapname),
"SNAPOBJ=%llu-ERR=%d",
(unsigned long long)ds->ds_object, err);
}
dmu_buf_rele(headdbuf, FTAG);
return (err);
}
int
dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value)
{
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
matchtype_t mt = 0;
int err;
if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
mt = MT_NORMALIZE;
err = zap_lookup_norm(mos, snapobj, name, 8, 1,
value, mt, NULL, 0, NULL);
if (err == ENOTSUP && (mt & MT_NORMALIZE))
err = zap_lookup(mos, snapobj, name, 8, 1, value);
return (err);
}
int
dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx,
boolean_t adj_cnt)
{
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
matchtype_t mt = 0;
int err;
dsl_dir_snap_cmtime_update(ds->ds_dir, tx);
if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
mt = MT_NORMALIZE;
err = zap_remove_norm(mos, snapobj, name, mt, tx);
if (err == ENOTSUP && (mt & MT_NORMALIZE))
err = zap_remove(mos, snapobj, name, tx);
if (err == 0 && adj_cnt)
dsl_fs_ss_count_adjust(ds->ds_dir, -1,
DD_FIELD_SNAPSHOT_COUNT, tx);
return (err);
}
boolean_t
dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, const void *tag)
{
dmu_buf_t *dbuf = ds->ds_dbuf;
boolean_t result = B_FALSE;
if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset,
ds->ds_object, DMU_BONUS_BLKID, tag)) {
if (ds == dmu_buf_get_user(dbuf))
result = B_TRUE;
else
dmu_buf_rele(dbuf, tag);
}
return (result);
}
int
dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, const void *tag,
dsl_dataset_t **dsp)
{
objset_t *mos = dp->dp_meta_objset;
dmu_buf_t *dbuf;
dsl_dataset_t *ds;
int err;
dmu_object_info_t doi;
ASSERT(dsl_pool_config_held(dp));
err = dmu_bonus_hold(mos, dsobj, tag, &dbuf);
if (err != 0)
return (err);
/* Make sure dsobj has the correct object type. */
dmu_object_info_from_db(dbuf, &doi);
if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) {
dmu_buf_rele(dbuf, tag);
return (SET_ERROR(EINVAL));
}
ds = dmu_buf_get_user(dbuf);
if (ds == NULL) {
dsl_dataset_t *winner = NULL;
ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP);
ds->ds_dbuf = dbuf;
ds->ds_object = dsobj;
ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0;
list_link_init(&ds->ds_synced_link);
err = dsl_dir_hold_obj(dp, dsl_dataset_phys(ds)->ds_dir_obj,
NULL, ds, &ds->ds_dir);
if (err != 0) {
kmem_free(ds, sizeof (dsl_dataset_t));
dmu_buf_rele(dbuf, tag);
return (err);
}
mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL);
mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL);
mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL);
mutex_init(&ds->ds_remap_deadlist_lock,
NULL, MUTEX_DEFAULT, NULL);
rrw_init(&ds->ds_bp_rwlock, B_FALSE);
zfs_refcount_create(&ds->ds_longholds);
bplist_create(&ds->ds_pending_deadlist);
list_create(&ds->ds_sendstreams, sizeof (dmu_sendstatus_t),
offsetof(dmu_sendstatus_t, dss_link));
list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t),
offsetof(dsl_prop_cb_record_t, cbr_ds_node));
if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
spa_feature_t f;
for (f = 0; f < SPA_FEATURES; f++) {
if (!(spa_feature_table[f].fi_flags &
ZFEATURE_FLAG_PER_DATASET))
continue;
err = load_zfeature(mos, ds, f);
}
}
if (!ds->ds_is_snapshot) {
ds->ds_snapname[0] = '\0';
if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
err = dsl_dataset_hold_obj(dp,
dsl_dataset_phys(ds)->ds_prev_snap_obj,
ds, &ds->ds_prev);
}
if (err != 0)
goto after_dsl_bookmark_fini;
err = dsl_bookmark_init_ds(ds);
} else {
if (zfs_flags & ZFS_DEBUG_SNAPNAMES)
err = dsl_dataset_get_snapname(ds);
if (err == 0 &&
dsl_dataset_phys(ds)->ds_userrefs_obj != 0) {
err = zap_count(
ds->ds_dir->dd_pool->dp_meta_objset,
dsl_dataset_phys(ds)->ds_userrefs_obj,
&ds->ds_userrefs);
}
}
if (err == 0 && !ds->ds_is_snapshot) {
err = dsl_prop_get_int_ds(ds,
zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
&ds->ds_reserved);
if (err == 0) {
err = dsl_prop_get_int_ds(ds,
zfs_prop_to_name(ZFS_PROP_REFQUOTA),
&ds->ds_quota);
}
} else {
ds->ds_reserved = ds->ds_quota = 0;
}
if (err == 0 && ds->ds_dir->dd_crypto_obj != 0 &&
ds->ds_is_snapshot &&
zap_contains(mos, dsobj, DS_FIELD_IVSET_GUID) != 0) {
dp->dp_spa->spa_errata =
ZPOOL_ERRATA_ZOL_8308_ENCRYPTION;
}
dsl_deadlist_open(&ds->ds_deadlist,
mos, dsl_dataset_phys(ds)->ds_deadlist_obj);
uint64_t remap_deadlist_obj =
dsl_dataset_get_remap_deadlist_object(ds);
if (remap_deadlist_obj != 0) {
dsl_deadlist_open(&ds->ds_remap_deadlist, mos,
remap_deadlist_obj);
}
dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict_sync,
dsl_dataset_evict_async, &ds->ds_dbuf);
if (err == 0)
winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu);
if (err != 0 || winner != NULL) {
dsl_deadlist_close(&ds->ds_deadlist);
if (dsl_deadlist_is_open(&ds->ds_remap_deadlist))
dsl_deadlist_close(&ds->ds_remap_deadlist);
dsl_bookmark_fini_ds(ds);
after_dsl_bookmark_fini:
if (ds->ds_prev)
dsl_dataset_rele(ds->ds_prev, ds);
dsl_dir_rele(ds->ds_dir, ds);
for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
if (dsl_dataset_feature_is_active(ds, f))
unload_zfeature(ds, f);
}
list_destroy(&ds->ds_prop_cbs);
list_destroy(&ds->ds_sendstreams);
bplist_destroy(&ds->ds_pending_deadlist);
mutex_destroy(&ds->ds_lock);
mutex_destroy(&ds->ds_opening_lock);
mutex_destroy(&ds->ds_sendstream_lock);
mutex_destroy(&ds->ds_remap_deadlist_lock);
zfs_refcount_destroy(&ds->ds_longholds);
rrw_destroy(&ds->ds_bp_rwlock);
kmem_free(ds, sizeof (dsl_dataset_t));
if (err != 0) {
dmu_buf_rele(dbuf, tag);
return (err);
}
ds = winner;
} else {
ds->ds_fsid_guid =
unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid);
if (ds->ds_fsid_guid !=
dsl_dataset_phys(ds)->ds_fsid_guid) {
zfs_dbgmsg("ds_fsid_guid changed from "
"%llx to %llx for pool %s dataset id %llu",
(long long)
dsl_dataset_phys(ds)->ds_fsid_guid,
(long long)ds->ds_fsid_guid,
spa_name(dp->dp_spa),
(u_longlong_t)dsobj);
}
}
}
ASSERT3P(ds->ds_dbuf, ==, dbuf);
ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data);
ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 ||
spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN ||
dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap);
*dsp = ds;
return (0);
}
int
dsl_dataset_create_key_mapping(dsl_dataset_t *ds)
{
dsl_dir_t *dd = ds->ds_dir;
if (dd->dd_crypto_obj == 0)
return (0);
return (spa_keystore_create_mapping(dd->dd_pool->dp_spa,
ds, ds, &ds->ds_key_mapping));
}
int
dsl_dataset_hold_obj_flags(dsl_pool_t *dp, uint64_t dsobj,
ds_hold_flags_t flags, const void *tag, dsl_dataset_t **dsp)
{
int err;
err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp);
if (err != 0)
return (err);
ASSERT3P(*dsp, !=, NULL);
if (flags & DS_HOLD_FLAG_DECRYPT) {
err = dsl_dataset_create_key_mapping(*dsp);
if (err != 0)
dsl_dataset_rele(*dsp, tag);
}
return (err);
}
int
dsl_dataset_hold_flags(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags,
const void *tag, dsl_dataset_t **dsp)
{
dsl_dir_t *dd;
const char *snapname;
uint64_t obj;
int err = 0;
dsl_dataset_t *ds;
err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname);
if (err != 0)
return (err);
ASSERT(dsl_pool_config_held(dp));
obj = dsl_dir_phys(dd)->dd_head_dataset_obj;
if (obj != 0)
err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag, &ds);
else
err = SET_ERROR(ENOENT);
/* we may be looking for a snapshot */
if (err == 0 && snapname != NULL) {
dsl_dataset_t *snap_ds;
if (*snapname++ != '@') {
dsl_dataset_rele_flags(ds, flags, tag);
dsl_dir_rele(dd, FTAG);
return (SET_ERROR(ENOENT));
}
dprintf("looking for snapshot '%s'\n", snapname);
err = dsl_dataset_snap_lookup(ds, snapname, &obj);
if (err == 0) {
err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag,
&snap_ds);
}
dsl_dataset_rele_flags(ds, flags, tag);
if (err == 0) {
mutex_enter(&snap_ds->ds_lock);
if (snap_ds->ds_snapname[0] == 0)
(void) strlcpy(snap_ds->ds_snapname, snapname,
sizeof (snap_ds->ds_snapname));
mutex_exit(&snap_ds->ds_lock);
ds = snap_ds;
}
}
if (err == 0)
*dsp = ds;
dsl_dir_rele(dd, FTAG);
return (err);
}
int
dsl_dataset_hold(dsl_pool_t *dp, const char *name, const void *tag,
dsl_dataset_t **dsp)
{
return (dsl_dataset_hold_flags(dp, name, 0, tag, dsp));
}
static int
dsl_dataset_own_obj_impl(dsl_pool_t *dp, uint64_t dsobj, ds_hold_flags_t flags,
const void *tag, boolean_t override, dsl_dataset_t **dsp)
{
int err = dsl_dataset_hold_obj_flags(dp, dsobj, flags, tag, dsp);
if (err != 0)
return (err);
if (!dsl_dataset_tryown(*dsp, tag, override)) {
dsl_dataset_rele_flags(*dsp, flags, tag);
*dsp = NULL;
return (SET_ERROR(EBUSY));
}
return (0);
}
int
dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, ds_hold_flags_t flags,
const void *tag, dsl_dataset_t **dsp)
{
return (dsl_dataset_own_obj_impl(dp, dsobj, flags, tag, B_FALSE, dsp));
}
int
dsl_dataset_own_obj_force(dsl_pool_t *dp, uint64_t dsobj,
ds_hold_flags_t flags, const void *tag, dsl_dataset_t **dsp)
{
return (dsl_dataset_own_obj_impl(dp, dsobj, flags, tag, B_TRUE, dsp));
}
static int
dsl_dataset_own_impl(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags,
const void *tag, boolean_t override, dsl_dataset_t **dsp)
{
int err = dsl_dataset_hold_flags(dp, name, flags, tag, dsp);
if (err != 0)
return (err);
if (!dsl_dataset_tryown(*dsp, tag, override)) {
dsl_dataset_rele_flags(*dsp, flags, tag);
return (SET_ERROR(EBUSY));
}
return (0);
}
int
dsl_dataset_own_force(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags,
const void *tag, dsl_dataset_t **dsp)
{
return (dsl_dataset_own_impl(dp, name, flags, tag, B_TRUE, dsp));
}
int
dsl_dataset_own(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags,
const void *tag, dsl_dataset_t **dsp)
{
return (dsl_dataset_own_impl(dp, name, flags, tag, B_FALSE, dsp));
}
/*
* See the comment above dsl_pool_hold() for details. In summary, a long
* hold is used to prevent destruction of a dataset while the pool hold
* is dropped, allowing other concurrent operations (e.g. spa_sync()).
*
* The dataset and pool must be held when this function is called. After it
* is called, the pool hold may be released while the dataset is still held
* and accessed.
*/
void
dsl_dataset_long_hold(dsl_dataset_t *ds, const void *tag)
{
ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
(void) zfs_refcount_add(&ds->ds_longholds, tag);
}
void
dsl_dataset_long_rele(dsl_dataset_t *ds, const void *tag)
{
(void) zfs_refcount_remove(&ds->ds_longholds, tag);
}
/* Return B_TRUE if there are any long holds on this dataset. */
boolean_t
dsl_dataset_long_held(dsl_dataset_t *ds)
{
return (!zfs_refcount_is_zero(&ds->ds_longholds));
}
void
dsl_dataset_name(dsl_dataset_t *ds, char *name)
{
if (ds == NULL) {
(void) strlcpy(name, "mos", ZFS_MAX_DATASET_NAME_LEN);
} else {
dsl_dir_name(ds->ds_dir, name);
VERIFY0(dsl_dataset_get_snapname(ds));
if (ds->ds_snapname[0]) {
VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN),
<, ZFS_MAX_DATASET_NAME_LEN);
/*
* We use a "recursive" mutex so that we
* can call dprintf_ds() with ds_lock held.
*/
if (!MUTEX_HELD(&ds->ds_lock)) {
mutex_enter(&ds->ds_lock);
VERIFY3U(strlcat(name, ds->ds_snapname,
ZFS_MAX_DATASET_NAME_LEN), <,
ZFS_MAX_DATASET_NAME_LEN);
mutex_exit(&ds->ds_lock);
} else {
VERIFY3U(strlcat(name, ds->ds_snapname,
ZFS_MAX_DATASET_NAME_LEN), <,
ZFS_MAX_DATASET_NAME_LEN);
}
}
}
}
int
dsl_dataset_namelen(dsl_dataset_t *ds)
{
VERIFY0(dsl_dataset_get_snapname(ds));
mutex_enter(&ds->ds_lock);
int len = strlen(ds->ds_snapname);
mutex_exit(&ds->ds_lock);
/* add '@' if ds is a snap */
if (len > 0)
len++;
len += dsl_dir_namelen(ds->ds_dir);
return (len);
}
void
dsl_dataset_rele(dsl_dataset_t *ds, const void *tag)
{
dmu_buf_rele(ds->ds_dbuf, tag);
}
void
dsl_dataset_remove_key_mapping(dsl_dataset_t *ds)
{
dsl_dir_t *dd = ds->ds_dir;
if (dd == NULL || dd->dd_crypto_obj == 0)
return;
(void) spa_keystore_remove_mapping(dd->dd_pool->dp_spa,
ds->ds_object, ds);
}
void
dsl_dataset_rele_flags(dsl_dataset_t *ds, ds_hold_flags_t flags,
const void *tag)
{
if (flags & DS_HOLD_FLAG_DECRYPT)
dsl_dataset_remove_key_mapping(ds);
dsl_dataset_rele(ds, tag);
}
void
dsl_dataset_disown(dsl_dataset_t *ds, ds_hold_flags_t flags, const void *tag)
{
ASSERT3P(ds->ds_owner, ==, tag);
ASSERT(ds->ds_dbuf != NULL);
mutex_enter(&ds->ds_lock);
ds->ds_owner = NULL;
mutex_exit(&ds->ds_lock);
dsl_dataset_long_rele(ds, tag);
dsl_dataset_rele_flags(ds, flags, tag);
}
boolean_t
dsl_dataset_tryown(dsl_dataset_t *ds, const void *tag, boolean_t override)
{
boolean_t gotit = FALSE;
ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
mutex_enter(&ds->ds_lock);
if (ds->ds_owner == NULL && (override || !(DS_IS_INCONSISTENT(ds) ||
(dsl_dataset_feature_is_active(ds,
SPA_FEATURE_REDACTED_DATASETS) &&
!zfs_allow_redacted_dataset_mount)))) {
ds->ds_owner = tag;
dsl_dataset_long_hold(ds, tag);
gotit = TRUE;
}
mutex_exit(&ds->ds_lock);
return (gotit);
}
boolean_t
dsl_dataset_has_owner(dsl_dataset_t *ds)
{
boolean_t rv;
mutex_enter(&ds->ds_lock);
rv = (ds->ds_owner != NULL);
mutex_exit(&ds->ds_lock);
return (rv);
}
static boolean_t
zfeature_active(spa_feature_t f, void *arg)
{
switch (spa_feature_table[f].fi_type) {
case ZFEATURE_TYPE_BOOLEAN: {
boolean_t val = (boolean_t)(uintptr_t)arg;
ASSERT(val == B_FALSE || val == B_TRUE);
return (val);
}
case ZFEATURE_TYPE_UINT64_ARRAY:
/*
* In this case, arg is a uint64_t array. The feature is active
* if the array is non-null.
*/
return (arg != NULL);
default:
panic("Invalid zfeature type %d", spa_feature_table[f].fi_type);
return (B_FALSE);
}
}
boolean_t
dsl_dataset_feature_is_active(dsl_dataset_t *ds, spa_feature_t f)
{
return (zfeature_active(f, ds->ds_feature[f]));
}
/*
* The buffers passed out by this function are references to internal buffers;
* they should not be freed by callers of this function, and they should not be
* used after the dataset has been released.
*/
boolean_t
dsl_dataset_get_uint64_array_feature(dsl_dataset_t *ds, spa_feature_t f,
uint64_t *outlength, uint64_t **outp)
{
VERIFY(spa_feature_table[f].fi_type & ZFEATURE_TYPE_UINT64_ARRAY);
if (!dsl_dataset_feature_is_active(ds, f)) {
return (B_FALSE);
}
struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f];
*outp = ftuaa->array;
*outlength = ftuaa->length;
return (B_TRUE);
}
void
dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, void *arg,
dmu_tx_t *tx)
{
spa_t *spa = dmu_tx_pool(tx)->dp_spa;
objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
uint64_t zero = 0;
VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
spa_feature_incr(spa, f, tx);
dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx);
switch (spa_feature_table[f].fi_type) {
case ZFEATURE_TYPE_BOOLEAN:
ASSERT3S((boolean_t)(uintptr_t)arg, ==, B_TRUE);
VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid,
sizeof (zero), 1, &zero, tx));
break;
case ZFEATURE_TYPE_UINT64_ARRAY:
{
struct feature_type_uint64_array_arg *ftuaa = arg;
VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid,
sizeof (uint64_t), ftuaa->length, ftuaa->array, tx));
break;
}
default:
panic("Invalid zfeature type %d", spa_feature_table[f].fi_type);
}
}
static void
dsl_dataset_deactivate_feature_impl(dsl_dataset_t *ds, spa_feature_t f,
dmu_tx_t *tx)
{
spa_t *spa = dmu_tx_pool(tx)->dp_spa;
objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
uint64_t dsobj = ds->ds_object;
VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx));
spa_feature_decr(spa, f, tx);
ds->ds_feature[f] = NULL;
}
void
dsl_dataset_deactivate_feature(dsl_dataset_t *ds, spa_feature_t f, dmu_tx_t *tx)
{
unload_zfeature(ds, f);
dsl_dataset_deactivate_feature_impl(ds, f, tx);
}
uint64_t
dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
dsl_crypto_params_t *dcp, uint64_t flags, dmu_tx_t *tx)
{
dsl_pool_t *dp = dd->dd_pool;
dmu_buf_t *dbuf;
dsl_dataset_phys_t *dsphys;
uint64_t dsobj;
objset_t *mos = dp->dp_meta_objset;
if (origin == NULL)
origin = dp->dp_origin_snap;
ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp);
ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0);
ASSERT(dmu_tx_is_syncing(tx));
ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0);
dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
dmu_buf_will_dirty(dbuf, tx);
dsphys = dbuf->db_data;
memset(dsphys, 0, sizeof (dsl_dataset_phys_t));
dsphys->ds_dir_obj = dd->dd_object;
dsphys->ds_flags = flags;
dsphys->ds_fsid_guid = unique_create();
(void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
sizeof (dsphys->ds_guid));
dsphys->ds_snapnames_zapobj =
zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP,
DMU_OT_NONE, 0, tx);
dsphys->ds_creation_time = gethrestime_sec();
dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg;
if (origin == NULL) {
dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx);
} else {
dsl_dataset_t *ohds; /* head of the origin snapshot */
dsphys->ds_prev_snap_obj = origin->ds_object;
dsphys->ds_prev_snap_txg =
dsl_dataset_phys(origin)->ds_creation_txg;
dsphys->ds_referenced_bytes =
dsl_dataset_phys(origin)->ds_referenced_bytes;
dsphys->ds_compressed_bytes =
dsl_dataset_phys(origin)->ds_compressed_bytes;
dsphys->ds_uncompressed_bytes =
dsl_dataset_phys(origin)->ds_uncompressed_bytes;
rrw_enter(&origin->ds_bp_rwlock, RW_READER, FTAG);
dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp;
rrw_exit(&origin->ds_bp_rwlock, FTAG);
/*
* Inherit flags that describe the dataset's contents
* (INCONSISTENT) or properties (Case Insensitive).
*/
dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags &
(DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET);
for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
if (zfeature_active(f, origin->ds_feature[f])) {
dsl_dataset_activate_feature(dsobj, f,
origin->ds_feature[f], tx);
}
}
dmu_buf_will_dirty(origin->ds_dbuf, tx);
dsl_dataset_phys(origin)->ds_num_children++;
VERIFY0(dsl_dataset_hold_obj(dp,
dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj,
FTAG, &ohds));
dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist,
dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx);
dsl_dataset_rele(ohds, FTAG);
if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) {
if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) {
dsl_dataset_phys(origin)->ds_next_clones_obj =
zap_create(mos,
DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx);
}
VERIFY0(zap_add_int(mos,
dsl_dataset_phys(origin)->ds_next_clones_obj,
dsobj, tx));
}
dmu_buf_will_dirty(dd->dd_dbuf, tx);
dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object;
if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) {
dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx);
dsl_dir_phys(origin->ds_dir)->dd_clones =
zap_create(mos,
DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx);
}
VERIFY0(zap_add_int(mos,
dsl_dir_phys(origin->ds_dir)->dd_clones,
dsobj, tx));
}
}
/* handle encryption */
dsl_dataset_create_crypt_sync(dsobj, dd, origin, dcp, tx);
if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
dmu_buf_rele(dbuf, FTAG);
dmu_buf_will_dirty(dd->dd_dbuf, tx);
dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj;
return (dsobj);
}
static void
dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx)
{
objset_t *os;
VERIFY0(dmu_objset_from_ds(ds, &os));
if (memcmp(&os->os_zil_header, &zero_zil, sizeof (zero_zil)) != 0) {
dsl_pool_t *dp = ds->ds_dir->dd_pool;
zio_t *zio;
memset(&os->os_zil_header, 0, sizeof (os->os_zil_header));
if (os->os_encrypted)
os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE;
zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
dsl_dataset_sync(ds, zio, tx);
VERIFY0(zio_wait(zio));
/* dsl_dataset_sync_done will drop this reference. */
dmu_buf_add_ref(ds->ds_dbuf, ds);
dsl_dataset_sync_done(ds, tx);
}
}
uint64_t
dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname,
dsl_dataset_t *origin, uint64_t flags, cred_t *cr,
dsl_crypto_params_t *dcp, dmu_tx_t *tx)
{
dsl_pool_t *dp = pdd->dd_pool;
uint64_t dsobj, ddobj;
dsl_dir_t *dd;
ASSERT(dmu_tx_is_syncing(tx));
ASSERT(lastname[0] != '@');
/*
* Filesystems will eventually have their origin set to dp_origin_snap,
* but that's taken care of in dsl_dataset_create_sync_dd. When
* creating a filesystem, this function is called with origin equal to
* NULL.
*/
if (origin != NULL)
ASSERT3P(origin, !=, dp->dp_origin_snap);
ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx);
VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd));
dsobj = dsl_dataset_create_sync_dd(dd, origin, dcp,
flags & ~DS_CREATE_FLAG_NODIRTY, tx);
dsl_deleg_set_create_perms(dd, tx, cr);
/*
* If we are creating a clone and the livelist feature is enabled,
* add the entry DD_FIELD_LIVELIST to ZAP.
*/
if (origin != NULL &&
spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LIVELIST)) {
objset_t *mos = dd->dd_pool->dp_meta_objset;
dsl_dir_zapify(dd, tx);
uint64_t obj = dsl_deadlist_alloc(mos, tx);
VERIFY0(zap_add(mos, dd->dd_object, DD_FIELD_LIVELIST,
sizeof (uint64_t), 1, &obj, tx));
spa_feature_incr(dp->dp_spa, SPA_FEATURE_LIVELIST, tx);
}
/*
* Since we're creating a new node we know it's a leaf, so we can
* initialize the counts if the limit feature is active.
*/
if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) {
uint64_t cnt = 0;
objset_t *os = dd->dd_pool->dp_meta_objset;
dsl_dir_zapify(dd, tx);
VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
sizeof (cnt), 1, &cnt, tx));
VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
sizeof (cnt), 1, &cnt, tx));
}
dsl_dir_rele(dd, FTAG);
/*
* If we are creating a clone, make sure we zero out any stale
* data from the origin snapshots zil header.
*/
if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) {
dsl_dataset_t *ds;
VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
dsl_dataset_zero_zil(ds, tx);
dsl_dataset_rele(ds, FTAG);
}
return (dsobj);
}
/*
* The unique space in the head dataset can be calculated by subtracting
* the space used in the most recent snapshot, that is still being used
* in this file system, from the space currently in use. To figure out
* the space in the most recent snapshot still in use, we need to take
* the total space used in the snapshot and subtract out the space that
* has been freed up since the snapshot was taken.
*/
void
dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds)
{
uint64_t mrs_used;
uint64_t dlused, dlcomp, dluncomp;
ASSERT(!ds->ds_is_snapshot);
if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0)
mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes;
else
mrs_used = 0;
dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp);
ASSERT3U(dlused, <=, mrs_used);
dsl_dataset_phys(ds)->ds_unique_bytes =
dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused);
if (spa_version(ds->ds_dir->dd_pool->dp_spa) >=
SPA_VERSION_UNIQUE_ACCURATE)
dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
}
void
dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
dmu_tx_t *tx)
{
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
uint64_t count __maybe_unused;
int err;
ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2);
err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
obj, tx);
/*
* The err should not be ENOENT, but a bug in a previous version
* of the code could cause upgrade_clones_cb() to not set
* ds_next_snap_obj when it should, leading to a missing entry.
* If we knew that the pool was created after
* SPA_VERSION_NEXT_CLONES, we could assert that it isn't
* ENOENT. However, at least we can check that we don't have
* too many entries in the next_clones_obj even after failing to
* remove this one.
*/
if (err != ENOENT)
VERIFY0(err);
ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
&count));
ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2);
}
blkptr_t *
dsl_dataset_get_blkptr(dsl_dataset_t *ds)
{
return (&dsl_dataset_phys(ds)->ds_bp);
}
spa_t *
dsl_dataset_get_spa(dsl_dataset_t *ds)
{
return (ds->ds_dir->dd_pool->dp_spa);
}
void
dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx)
{
dsl_pool_t *dp;
if (ds == NULL) /* this is the meta-objset */
return;
ASSERT(ds->ds_objset != NULL);
if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0)
panic("dirtying snapshot!");
/* Must not dirty a dataset in the same txg where it got snapshotted. */
ASSERT3U(tx->tx_txg, >, dsl_dataset_phys(ds)->ds_prev_snap_txg);
dp = ds->ds_dir->dd_pool;
if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) {
objset_t *os = ds->ds_objset;
/* up the hold count until we can be written out */
dmu_buf_add_ref(ds->ds_dbuf, ds);
/* if this dataset is encrypted, grab a reference to the DCK */
if (ds->ds_dir->dd_crypto_obj != 0 &&
!os->os_raw_receive &&
!os->os_next_write_raw[tx->tx_txg & TXG_MASK]) {
ASSERT3P(ds->ds_key_mapping, !=, NULL);
key_mapping_add_ref(ds->ds_key_mapping, ds);
}
}
}
static int
dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx)
{
uint64_t asize;
if (!dmu_tx_is_syncing(tx))
return (0);
/*
* If there's an fs-only reservation, any blocks that might become
* owned by the snapshot dataset must be accommodated by space
* outside of the reservation.
*/
ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds));
asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved);
if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE))
return (SET_ERROR(ENOSPC));
/*
* Propagate any reserved space for this snapshot to other
* snapshot checks in this sync group.
*/
if (asize > 0)
dsl_dir_willuse_space(ds->ds_dir, asize, tx);
return (0);
}
int
dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr, proc_t *proc)
{
int error;
uint64_t value;
ds->ds_trysnap_txg = tx->tx_txg;
if (!dmu_tx_is_syncing(tx))
return (0);
/*
* We don't allow multiple snapshots of the same txg. If there
* is already one, try again.
*/
if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg)
return (SET_ERROR(EAGAIN));
/*
* Check for conflicting snapshot name.
*/
error = dsl_dataset_snap_lookup(ds, snapname, &value);
if (error == 0)
return (SET_ERROR(EEXIST));
if (error != ENOENT)
return (error);
/*
* We don't allow taking snapshots of inconsistent datasets, such as
* those into which we are currently receiving. However, if we are
* creating this snapshot as part of a receive, this check will be
* executed atomically with respect to the completion of the receive
* itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
* case we ignore this, knowing it will be fixed up for us shortly in
* dmu_recv_end_sync().
*/
if (!recv && DS_IS_INCONSISTENT(ds))
return (SET_ERROR(EBUSY));
/*
* Skip the check for temporary snapshots or if we have already checked
* the counts in dsl_dataset_snapshot_check. This means we really only
* check the count here when we're receiving a stream.
*/
if (cnt != 0 && cr != NULL) {
error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr, proc);
if (error != 0)
return (error);
}
error = dsl_dataset_snapshot_reserve_space(ds, tx);
if (error != 0)
return (error);
return (0);
}
int
dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx)
{
dsl_dataset_snapshot_arg_t *ddsa = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
nvpair_t *pair;
int rv = 0;
/*
* Pre-compute how many total new snapshots will be created for each
* level in the tree and below. This is needed for validating the
* snapshot limit when either taking a recursive snapshot or when
* taking multiple snapshots.
*
* The problem is that the counts are not actually adjusted when
* we are checking, only when we finally sync. For a single snapshot,
* this is easy, the count will increase by 1 at each node up the tree,
* but its more complicated for the recursive/multiple snapshot case.
*
* The dsl_fs_ss_limit_check function does recursively check the count
* at each level up the tree but since it is validating each snapshot
* independently we need to be sure that we are validating the complete
* count for the entire set of snapshots. We do this by rolling up the
* counts for each component of the name into an nvlist and then
* checking each of those cases with the aggregated count.
*
* This approach properly handles not only the recursive snapshot
* case (where we get all of those on the ddsa_snaps list) but also
* the sibling case (e.g. snapshot a/b and a/c so that we will also
* validate the limit on 'a' using a count of 2).
*
* We validate the snapshot names in the third loop and only report
* name errors once.
*/
if (dmu_tx_is_syncing(tx)) {
char *nm;
nvlist_t *cnt_track = NULL;
cnt_track = fnvlist_alloc();
nm = kmem_alloc(MAXPATHLEN, KM_SLEEP);
/* Rollup aggregated counts into the cnt_track list */
for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
pair != NULL;
pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
char *pdelim;
uint64_t val;
(void) strlcpy(nm, nvpair_name(pair), MAXPATHLEN);
pdelim = strchr(nm, '@');
if (pdelim == NULL)
continue;
*pdelim = '\0';
do {
if (nvlist_lookup_uint64(cnt_track, nm,
&val) == 0) {
/* update existing entry */
fnvlist_add_uint64(cnt_track, nm,
val + 1);
} else {
/* add to list */
fnvlist_add_uint64(cnt_track, nm, 1);
}
pdelim = strrchr(nm, '/');
if (pdelim != NULL)
*pdelim = '\0';
} while (pdelim != NULL);
}
kmem_free(nm, MAXPATHLEN);
/* Check aggregated counts at each level */
for (pair = nvlist_next_nvpair(cnt_track, NULL);
pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) {
int error = 0;
char *name;
uint64_t cnt = 0;
dsl_dataset_t *ds;
name = nvpair_name(pair);
cnt = fnvpair_value_uint64(pair);
ASSERT(cnt > 0);
error = dsl_dataset_hold(dp, name, FTAG, &ds);
if (error == 0) {
error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
ZFS_PROP_SNAPSHOT_LIMIT, NULL,
ddsa->ddsa_cr, ddsa->ddsa_proc);
dsl_dataset_rele(ds, FTAG);
}
if (error != 0) {
if (ddsa->ddsa_errors != NULL)
fnvlist_add_int32(ddsa->ddsa_errors,
name, error);
rv = error;
/* only report one error for this check */
break;
}
}
nvlist_free(cnt_track);
}
for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
int error = 0;
dsl_dataset_t *ds;
char *name, *atp = NULL;
char dsname[ZFS_MAX_DATASET_NAME_LEN];
name = nvpair_name(pair);
if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN)
error = SET_ERROR(ENAMETOOLONG);
if (error == 0) {
atp = strchr(name, '@');
if (atp == NULL)
error = SET_ERROR(EINVAL);
if (error == 0)
(void) strlcpy(dsname, name, atp - name + 1);
}
if (error == 0)
error = dsl_dataset_hold(dp, dsname, FTAG, &ds);
if (error == 0) {
/* passing 0/NULL skips dsl_fs_ss_limit_check */
error = dsl_dataset_snapshot_check_impl(ds,
atp + 1, tx, B_FALSE, 0, NULL, NULL);
dsl_dataset_rele(ds, FTAG);
}
if (error != 0) {
if (ddsa->ddsa_errors != NULL) {
fnvlist_add_int32(ddsa->ddsa_errors,
name, error);
}
rv = error;
}
}
return (rv);
}
void
dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
dmu_tx_t *tx)
{
dsl_pool_t *dp = ds->ds_dir->dd_pool;
dmu_buf_t *dbuf;
dsl_dataset_phys_t *dsphys;
uint64_t dsobj, crtxg;
objset_t *mos = dp->dp_meta_objset;
static zil_header_t zero_zil __maybe_unused;
objset_t *os __maybe_unused;
ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
/*
* If we are on an old pool, the zil must not be active, in which
* case it will be zeroed. Usually zil_suspend() accomplishes this.
*/
ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP ||
dmu_objset_from_ds(ds, &os) != 0 ||
memcmp(&os->os_phys->os_zil_header, &zero_zil,
sizeof (zero_zil)) == 0);
/* Should not snapshot a dirty dataset. */
ASSERT(!txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets,
ds, tx->tx_txg));
dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx);
/*
* The origin's ds_creation_txg has to be < TXG_INITIAL
*/
if (strcmp(snapname, ORIGIN_DIR_NAME) == 0)
crtxg = 1;
else
crtxg = tx->tx_txg;
dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
dmu_buf_will_dirty(dbuf, tx);
dsphys = dbuf->db_data;
memset(dsphys, 0, sizeof (dsl_dataset_phys_t));
dsphys->ds_dir_obj = ds->ds_dir->dd_object;
dsphys->ds_fsid_guid = unique_create();
(void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
sizeof (dsphys->ds_guid));
dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
dsphys->ds_next_snap_obj = ds->ds_object;
dsphys->ds_num_children = 1;
dsphys->ds_creation_time = gethrestime_sec();
dsphys->ds_creation_txg = crtxg;
dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj;
dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes;
dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes;
dsphys->ds_uncompressed_bytes =
dsl_dataset_phys(ds)->ds_uncompressed_bytes;
dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags;
rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp;
rrw_exit(&ds->ds_bp_rwlock, FTAG);
dmu_buf_rele(dbuf, FTAG);
for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
if (zfeature_active(f, ds->ds_feature[f])) {
dsl_dataset_activate_feature(dsobj, f,
ds->ds_feature[f], tx);
}
}
ASSERT3U(ds->ds_prev != 0, ==,
dsl_dataset_phys(ds)->ds_prev_snap_obj != 0);
if (ds->ds_prev) {
uint64_t next_clones_obj =
dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj;
ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
ds->ds_object ||
dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1);
if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
ds->ds_object) {
dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==,
dsl_dataset_phys(ds->ds_prev)->ds_creation_txg);
dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj;
} else if (next_clones_obj != 0) {
dsl_dataset_remove_from_next_clones(ds->ds_prev,
dsphys->ds_next_snap_obj, tx);
VERIFY0(zap_add_int(mos,
next_clones_obj, dsobj, tx));
}
}
/*
* If we have a reference-reservation on this dataset, we will
* need to increase the amount of refreservation being charged
* since our unique space is going to zero.
*/
if (ds->ds_reserved) {
int64_t delta;
ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes,
ds->ds_reserved);
dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV,
delta, 0, 0, tx);
}
dmu_buf_will_dirty(ds->ds_dbuf, tx);
dsl_dataset_phys(ds)->ds_deadlist_obj =
dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX,
dsl_dataset_phys(ds)->ds_prev_snap_obj, tx);
dsl_deadlist_close(&ds->ds_deadlist);
dsl_deadlist_open(&ds->ds_deadlist, mos,
dsl_dataset_phys(ds)->ds_deadlist_obj);
dsl_deadlist_add_key(&ds->ds_deadlist,
dsl_dataset_phys(ds)->ds_prev_snap_txg, tx);
dsl_bookmark_snapshotted(ds, tx);
if (dsl_dataset_remap_deadlist_exists(ds)) {
uint64_t remap_deadlist_obj =
dsl_dataset_get_remap_deadlist_object(ds);
/*
* Move the remap_deadlist to the snapshot. The head
* will create a new remap deadlist on demand, from
* dsl_dataset_block_remapped().
*/
dsl_dataset_unset_remap_deadlist_object(ds, tx);
dsl_deadlist_close(&ds->ds_remap_deadlist);
dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx);
VERIFY0(zap_add(mos, dsobj, DS_FIELD_REMAP_DEADLIST,
sizeof (remap_deadlist_obj), 1, &remap_deadlist_obj, tx));
}
/*
* Create a ivset guid for this snapshot if the dataset is
* encrypted. This may be overridden by a raw receive. A
* previous implementation of this code did not have this
* field as part of the on-disk format for ZFS encryption
* (see errata #4). As part of the remediation for this
* issue, we ask the user to enable the bookmark_v2 feature
* which is now a dependency of the encryption feature. We
* use this as a heuristic to determine when the user has
* elected to correct any datasets created with the old code.
* As a result, we only do this step if the bookmark_v2
* feature is enabled, which limits the number of states a
* given pool / dataset can be in with regards to terms of
* correcting the issue.
*/
if (ds->ds_dir->dd_crypto_obj != 0 &&
spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARK_V2)) {
uint64_t ivset_guid = unique_create();
dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx);
VERIFY0(zap_add(mos, dsobj, DS_FIELD_IVSET_GUID,
sizeof (ivset_guid), 1, &ivset_guid, tx));
}
ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg);
dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj;
dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg;
dsl_dataset_phys(ds)->ds_unique_bytes = 0;
if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj,
snapname, 8, 1, &dsobj, tx));
if (ds->ds_prev)
dsl_dataset_rele(ds->ds_prev, ds);
VERIFY0(dsl_dataset_hold_obj(dp,
dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev));
dsl_scan_ds_snapshotted(ds, tx);
dsl_dir_snap_cmtime_update(ds->ds_dir, tx);
if (zfs_snapshot_history_enabled)
spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, " ");
}
void
dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx)
{
dsl_dataset_snapshot_arg_t *ddsa = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
nvpair_t *pair;
for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
dsl_dataset_t *ds;
char *name, *atp;
char dsname[ZFS_MAX_DATASET_NAME_LEN];
name = nvpair_name(pair);
atp = strchr(name, '@');
(void) strlcpy(dsname, name, atp - name + 1);
VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds));
dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx);
if (ddsa->ddsa_props != NULL) {
dsl_props_set_sync_impl(ds->ds_prev,
ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx);
}
dsl_dataset_rele(ds, FTAG);
}
}
/*
* The snapshots must all be in the same pool.
* All-or-nothing: if there are any failures, nothing will be modified.
*/
int
dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors)
{
dsl_dataset_snapshot_arg_t ddsa;
nvpair_t *pair;
boolean_t needsuspend;
int error;
spa_t *spa;
char *firstname;
nvlist_t *suspended = NULL;
pair = nvlist_next_nvpair(snaps, NULL);
if (pair == NULL)
return (0);
firstname = nvpair_name(pair);
error = spa_open(firstname, &spa, FTAG);
if (error != 0)
return (error);
needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
spa_close(spa, FTAG);
if (needsuspend) {
suspended = fnvlist_alloc();
for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
pair = nvlist_next_nvpair(snaps, pair)) {
char fsname[ZFS_MAX_DATASET_NAME_LEN];
char *snapname = nvpair_name(pair);
char *atp;
void *cookie;
atp = strchr(snapname, '@');
if (atp == NULL) {
error = SET_ERROR(EINVAL);
break;
}
(void) strlcpy(fsname, snapname, atp - snapname + 1);
error = zil_suspend(fsname, &cookie);
if (error != 0)
break;
fnvlist_add_uint64(suspended, fsname,
(uintptr_t)cookie);
}
}
ddsa.ddsa_snaps = snaps;
ddsa.ddsa_props = props;
ddsa.ddsa_errors = errors;
ddsa.ddsa_cr = CRED();
ddsa.ddsa_proc = curproc;
if (error == 0) {
error = dsl_sync_task(firstname, dsl_dataset_snapshot_check,
dsl_dataset_snapshot_sync, &ddsa,
fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL);
}
if (suspended != NULL) {
for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL;
pair = nvlist_next_nvpair(suspended, pair)) {
zil_resume((void *)(uintptr_t)
fnvpair_value_uint64(pair));
}
fnvlist_free(suspended);
}
if (error == 0) {
for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
pair = nvlist_next_nvpair(snaps, pair)) {
zvol_create_minor(nvpair_name(pair));
}
}
return (error);
}
typedef struct dsl_dataset_snapshot_tmp_arg {
const char *ddsta_fsname;
const char *ddsta_snapname;
minor_t ddsta_cleanup_minor;
const char *ddsta_htag;
} dsl_dataset_snapshot_tmp_arg_t;
static int
dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx)
{
dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *ds;
int error;
error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds);
if (error != 0)
return (error);
/* NULL cred means no limit check for tmp snapshot */
error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname,
tx, B_FALSE, 0, NULL, NULL);
if (error != 0) {
dsl_dataset_rele(ds, FTAG);
return (error);
}
if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) {
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(ENOTSUP));
}
error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag,
B_TRUE, tx);
if (error != 0) {
dsl_dataset_rele(ds, FTAG);
return (error);
}
dsl_dataset_rele(ds, FTAG);
return (0);
}
static void
dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx)
{
dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *ds = NULL;
VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds));
dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx);
dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag,
ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx);
dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx);
dsl_dataset_rele(ds, FTAG);
}
int
dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
minor_t cleanup_minor, const char *htag)
{
dsl_dataset_snapshot_tmp_arg_t ddsta;
int error;
spa_t *spa;
boolean_t needsuspend;
void *cookie;
ddsta.ddsta_fsname = fsname;
ddsta.ddsta_snapname = snapname;
ddsta.ddsta_cleanup_minor = cleanup_minor;
ddsta.ddsta_htag = htag;
error = spa_open(fsname, &spa, FTAG);
if (error != 0)
return (error);
needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
spa_close(spa, FTAG);
if (needsuspend) {
error = zil_suspend(fsname, &cookie);
if (error != 0)
return (error);
}
error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check,
dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED);
if (needsuspend)
zil_resume(cookie);
return (error);
}
void
dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx)
{
ASSERT(dmu_tx_is_syncing(tx));
ASSERT(ds->ds_objset != NULL);
ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0);
/*
* in case we had to change ds_fsid_guid when we opened it,
* sync it out now.
*/
dmu_buf_will_dirty(ds->ds_dbuf, tx);
dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid;
if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) {
VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1,
&ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx));
VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1,
&ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx));
VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1,
&ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx));
ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0;
ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0;
ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0;
}
dmu_objset_sync(ds->ds_objset, zio, tx);
for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
if (zfeature_active(f, ds->ds_feature_activation[f])) {
if (zfeature_active(f, ds->ds_feature[f]))
continue;
dsl_dataset_activate_feature(ds->ds_object, f,
ds->ds_feature_activation[f], tx);
ds->ds_feature[f] = ds->ds_feature_activation[f];
}
}
}
/*
* Check if the percentage of blocks shared between the clone and the
* snapshot (as opposed to those that are clone only) is below a certain
* threshold
*/
static boolean_t
dsl_livelist_should_disable(dsl_dataset_t *ds)
{
uint64_t used, referenced;
int percent_shared;
used = dsl_dir_get_usedds(ds->ds_dir);
referenced = dsl_get_referenced(ds);
if (referenced == 0)
return (B_FALSE);
percent_shared = (100 * (referenced - used)) / referenced;
if (percent_shared <= zfs_livelist_min_percent_shared)
return (B_TRUE);
return (B_FALSE);
}
/*
* Check if it is possible to combine two livelist entries into one.
* This is the case if the combined number of 'live' blkptrs (ALLOCs that
* don't have a matching FREE) is under the maximum sublist size.
* We check this by subtracting twice the total number of frees from the total
* number of blkptrs. FREEs are counted twice because each FREE blkptr
* will cancel out an ALLOC blkptr when the livelist is processed.
*/
static boolean_t
dsl_livelist_should_condense(dsl_deadlist_entry_t *first,
dsl_deadlist_entry_t *next)
{
uint64_t total_free = first->dle_bpobj.bpo_phys->bpo_num_freed +
next->dle_bpobj.bpo_phys->bpo_num_freed;
uint64_t total_entries = first->dle_bpobj.bpo_phys->bpo_num_blkptrs +
next->dle_bpobj.bpo_phys->bpo_num_blkptrs;
if ((total_entries - (2 * total_free)) < zfs_livelist_max_entries)
return (B_TRUE);
return (B_FALSE);
}
typedef struct try_condense_arg {
spa_t *spa;
dsl_dataset_t *ds;
} try_condense_arg_t;
/*
* Iterate over the livelist entries, searching for a pair to condense.
* A nonzero return value means stop, 0 means keep looking.
*/
static int
dsl_livelist_try_condense(void *arg, dsl_deadlist_entry_t *first)
{
try_condense_arg_t *tca = arg;
spa_t *spa = tca->spa;
dsl_dataset_t *ds = tca->ds;
dsl_deadlist_t *ll = &ds->ds_dir->dd_livelist;
dsl_deadlist_entry_t *next;
/* The condense thread has not yet been created at import */
if (spa->spa_livelist_condense_zthr == NULL)
return (1);
/* A condense is already in progress */
if (spa->spa_to_condense.ds != NULL)
return (1);
next = AVL_NEXT(&ll->dl_tree, &first->dle_node);
/* The livelist has only one entry - don't condense it */
if (next == NULL)
return (1);
/* Next is the newest entry - don't condense it */
if (AVL_NEXT(&ll->dl_tree, &next->dle_node) == NULL)
return (1);
/* This pair is not ready to condense but keep looking */
if (!dsl_livelist_should_condense(first, next))
return (0);
/*
* Add a ref to prevent the dataset from being evicted while
* the condense zthr or synctask are running. Ref will be
* released at the end of the condense synctask
*/
dmu_buf_add_ref(ds->ds_dbuf, spa);
spa->spa_to_condense.ds = ds;
spa->spa_to_condense.first = first;
spa->spa_to_condense.next = next;
spa->spa_to_condense.syncing = B_FALSE;
spa->spa_to_condense.cancelled = B_FALSE;
zthr_wakeup(spa->spa_livelist_condense_zthr);
return (1);
}
static void
dsl_flush_pending_livelist(dsl_dataset_t *ds, dmu_tx_t *tx)
{
dsl_dir_t *dd = ds->ds_dir;
spa_t *spa = ds->ds_dir->dd_pool->dp_spa;
dsl_deadlist_entry_t *last = dsl_deadlist_last(&dd->dd_livelist);
/* Check if we need to add a new sub-livelist */
if (last == NULL) {
/* The livelist is empty */
dsl_deadlist_add_key(&dd->dd_livelist,
tx->tx_txg - 1, tx);
} else if (spa_sync_pass(spa) == 1) {
/*
* Check if the newest entry is full. If it is, make a new one.
* We only do this once per sync because we could overfill a
* sublist in one sync pass and don't want to add another entry
* for a txg that is already represented. This ensures that
* blkptrs born in the same txg are stored in the same sublist.
*/
bpobj_t bpobj = last->dle_bpobj;
uint64_t all = bpobj.bpo_phys->bpo_num_blkptrs;
uint64_t free = bpobj.bpo_phys->bpo_num_freed;
uint64_t alloc = all - free;
if (alloc > zfs_livelist_max_entries) {
dsl_deadlist_add_key(&dd->dd_livelist,
tx->tx_txg - 1, tx);
}
}
/* Insert each entry into the on-disk livelist */
bplist_iterate(&dd->dd_pending_allocs,
dsl_deadlist_insert_alloc_cb, &dd->dd_livelist, tx);
bplist_iterate(&dd->dd_pending_frees,
dsl_deadlist_insert_free_cb, &dd->dd_livelist, tx);
/* Attempt to condense every pair of adjacent entries */
try_condense_arg_t arg = {
.spa = spa,
.ds = ds
};
dsl_deadlist_iterate(&dd->dd_livelist, dsl_livelist_try_condense,
&arg);
}
void
dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx)
{
objset_t *os = ds->ds_objset;
bplist_iterate(&ds->ds_pending_deadlist,
dsl_deadlist_insert_alloc_cb, &ds->ds_deadlist, tx);
if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist)) {
dsl_flush_pending_livelist(ds, tx);
if (dsl_livelist_should_disable(ds)) {
dsl_dir_remove_livelist(ds->ds_dir, tx, B_TRUE);
}
}
dsl_bookmark_sync_done(ds, tx);
multilist_destroy(&os->os_synced_dnodes);
if (os->os_encrypted)
os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_FALSE;
else
ASSERT0(os->os_next_write_raw[tx->tx_txg & TXG_MASK]);
ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx)));
dmu_buf_rele(ds->ds_dbuf, ds);
}
int
get_clones_stat_impl(dsl_dataset_t *ds, nvlist_t *val)
{
uint64_t count = 0;
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
zap_cursor_t zc;
zap_attribute_t za;
ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
/*
* There may be missing entries in ds_next_clones_obj
* due to a bug in a previous version of the code.
* Only trust it if it has the right number of entries.
*/
if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) {
VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
&count));
}
if (count != dsl_dataset_phys(ds)->ds_num_children - 1) {
return (SET_ERROR(ENOENT));
}
for (zap_cursor_init(&zc, mos,
dsl_dataset_phys(ds)->ds_next_clones_obj);
zap_cursor_retrieve(&zc, &za) == 0;
zap_cursor_advance(&zc)) {
dsl_dataset_t *clone;
char buf[ZFS_MAX_DATASET_NAME_LEN];
VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
za.za_first_integer, FTAG, &clone));
dsl_dir_name(clone->ds_dir, buf);
fnvlist_add_boolean(val, buf);
dsl_dataset_rele(clone, FTAG);
}
zap_cursor_fini(&zc);
return (0);
}
void
get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv)
{
nvlist_t *propval = fnvlist_alloc();
nvlist_t *val = fnvlist_alloc();
if (get_clones_stat_impl(ds, val) == 0) {
fnvlist_add_nvlist(propval, ZPROP_VALUE, val);
fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES),
propval);
}
nvlist_free(val);
nvlist_free(propval);
}
static char *
get_receive_resume_token_impl(dsl_dataset_t *ds)
{
if (!dsl_dataset_has_resume_receive_state(ds))
return (NULL);
dsl_pool_t *dp = ds->ds_dir->dd_pool;
char *str;
void *packed;
uint8_t *compressed;
uint64_t val;
nvlist_t *token_nv = fnvlist_alloc();
size_t packed_size, compressed_size;
if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) {
fnvlist_add_uint64(token_nv, "fromguid", val);
}
if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) {
fnvlist_add_uint64(token_nv, "object", val);
}
if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) {
fnvlist_add_uint64(token_nv, "offset", val);
}
if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) {
fnvlist_add_uint64(token_nv, "bytes", val);
}
if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) {
fnvlist_add_uint64(token_nv, "toguid", val);
}
char buf[MAXNAMELEN];
if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) {
fnvlist_add_string(token_nv, "toname", buf);
}
if (zap_contains(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_LARGEBLOCK) == 0) {
fnvlist_add_boolean(token_nv, "largeblockok");
}
if (zap_contains(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_EMBEDOK) == 0) {
fnvlist_add_boolean(token_nv, "embedok");
}
if (zap_contains(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_COMPRESSOK) == 0) {
fnvlist_add_boolean(token_nv, "compressok");
}
if (zap_contains(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_RAWOK) == 0) {
fnvlist_add_boolean(token_nv, "rawok");
}
if (dsl_dataset_feature_is_active(ds,
SPA_FEATURE_REDACTED_DATASETS)) {
uint64_t num_redact_snaps = 0;
uint64_t *redact_snaps = NULL;
VERIFY3B(dsl_dataset_get_uint64_array_feature(ds,
SPA_FEATURE_REDACTED_DATASETS, &num_redact_snaps,
&redact_snaps), ==, B_TRUE);
fnvlist_add_uint64_array(token_nv, "redact_snaps",
redact_snaps, num_redact_snaps);
}
if (zap_contains(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS) == 0) {
uint64_t num_redact_snaps = 0, int_size = 0;
uint64_t *redact_snaps = NULL;
VERIFY0(zap_length(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, &int_size,
&num_redact_snaps));
ASSERT3U(int_size, ==, sizeof (uint64_t));
redact_snaps = kmem_alloc(int_size * num_redact_snaps,
KM_SLEEP);
VERIFY0(zap_lookup(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, int_size,
num_redact_snaps, redact_snaps));
fnvlist_add_uint64_array(token_nv, "book_redact_snaps",
redact_snaps, num_redact_snaps);
kmem_free(redact_snaps, int_size * num_redact_snaps);
}
packed = fnvlist_pack(token_nv, &packed_size);
fnvlist_free(token_nv);
compressed = kmem_alloc(packed_size, KM_SLEEP);
compressed_size = gzip_compress(packed, compressed,
packed_size, packed_size, 6);
zio_cksum_t cksum;
fletcher_4_native_varsize(compressed, compressed_size, &cksum);
size_t alloc_size = compressed_size * 2 + 1;
str = kmem_alloc(alloc_size, KM_SLEEP);
for (int i = 0; i < compressed_size; i++) {
size_t offset = i * 2;
(void) snprintf(str + offset, alloc_size - offset,
"%02x", compressed[i]);
}
str[compressed_size * 2] = '\0';
char *propval = kmem_asprintf("%u-%llx-%llx-%s",
ZFS_SEND_RESUME_TOKEN_VERSION,
(longlong_t)cksum.zc_word[0],
(longlong_t)packed_size, str);
kmem_free(packed, packed_size);
kmem_free(str, alloc_size);
kmem_free(compressed, packed_size);
return (propval);
}
/*
* Returns a string that represents the receive resume state token. It should
* be freed with strfree(). NULL is returned if no resume state is present.
*/
char *
get_receive_resume_token(dsl_dataset_t *ds)
{
/*
* A failed "newfs" (e.g. full) resumable receive leaves
* the stats set on this dataset. Check here for the prop.
*/
char *token = get_receive_resume_token_impl(ds);
if (token != NULL)
return (token);
/*
* A failed incremental resumable receive leaves the
* stats set on our child named "%recv". Check the child
* for the prop.
*/
/* 6 extra bytes for /%recv */
char name[ZFS_MAX_DATASET_NAME_LEN + 6];
dsl_dataset_t *recv_ds;
dsl_dataset_name(ds, name);
if (strlcat(name, "/", sizeof (name)) < sizeof (name) &&
strlcat(name, recv_clone_name, sizeof (name)) < sizeof (name) &&
dsl_dataset_hold(ds->ds_dir->dd_pool, name, FTAG, &recv_ds) == 0) {
token = get_receive_resume_token_impl(recv_ds);
dsl_dataset_rele(recv_ds, FTAG);
}
return (token);
}
uint64_t
dsl_get_refratio(dsl_dataset_t *ds)
{
uint64_t ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 :
(dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 /
dsl_dataset_phys(ds)->ds_compressed_bytes);
return (ratio);
}
uint64_t
dsl_get_logicalreferenced(dsl_dataset_t *ds)
{
return (dsl_dataset_phys(ds)->ds_uncompressed_bytes);
}
uint64_t
dsl_get_compressratio(dsl_dataset_t *ds)
{
if (ds->ds_is_snapshot) {
return (dsl_get_refratio(ds));
} else {
dsl_dir_t *dd = ds->ds_dir;
mutex_enter(&dd->dd_lock);
uint64_t val = dsl_dir_get_compressratio(dd);
mutex_exit(&dd->dd_lock);
return (val);
}
}
uint64_t
dsl_get_used(dsl_dataset_t *ds)
{
if (ds->ds_is_snapshot) {
return (dsl_dataset_phys(ds)->ds_unique_bytes);
} else {
dsl_dir_t *dd = ds->ds_dir;
mutex_enter(&dd->dd_lock);
uint64_t val = dsl_dir_get_used(dd);
mutex_exit(&dd->dd_lock);
return (val);
}
}
uint64_t
dsl_get_creation(dsl_dataset_t *ds)
{
return (dsl_dataset_phys(ds)->ds_creation_time);
}
uint64_t
dsl_get_creationtxg(dsl_dataset_t *ds)
{
return (dsl_dataset_phys(ds)->ds_creation_txg);
}
uint64_t
dsl_get_refquota(dsl_dataset_t *ds)
{
return (ds->ds_quota);
}
uint64_t
dsl_get_refreservation(dsl_dataset_t *ds)
{
return (ds->ds_reserved);
}
uint64_t
dsl_get_guid(dsl_dataset_t *ds)
{
return (dsl_dataset_phys(ds)->ds_guid);
}
uint64_t
dsl_get_unique(dsl_dataset_t *ds)
{
return (dsl_dataset_phys(ds)->ds_unique_bytes);
}
uint64_t
dsl_get_objsetid(dsl_dataset_t *ds)
{
return (ds->ds_object);
}
uint64_t
dsl_get_userrefs(dsl_dataset_t *ds)
{
return (ds->ds_userrefs);
}
uint64_t
dsl_get_defer_destroy(dsl_dataset_t *ds)
{
return (DS_IS_DEFER_DESTROY(ds) ? 1 : 0);
}
uint64_t
dsl_get_referenced(dsl_dataset_t *ds)
{
return (dsl_dataset_phys(ds)->ds_referenced_bytes);
}
uint64_t
dsl_get_numclones(dsl_dataset_t *ds)
{
ASSERT(ds->ds_is_snapshot);
return (dsl_dataset_phys(ds)->ds_num_children - 1);
}
uint64_t
dsl_get_inconsistent(dsl_dataset_t *ds)
{
return ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT) ?
1 : 0);
}
uint64_t
dsl_get_redacted(dsl_dataset_t *ds)
{
return (dsl_dataset_feature_is_active(ds,
SPA_FEATURE_REDACTED_DATASETS));
}
uint64_t
dsl_get_available(dsl_dataset_t *ds)
{
uint64_t refdbytes = dsl_get_referenced(ds);
uint64_t availbytes = dsl_dir_space_available(ds->ds_dir,
NULL, 0, TRUE);
if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) {
availbytes +=
ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes;
}
if (ds->ds_quota != 0) {
/*
* Adjust available bytes according to refquota
*/
if (refdbytes < ds->ds_quota) {
availbytes = MIN(availbytes,
ds->ds_quota - refdbytes);
} else {
availbytes = 0;
}
}
return (availbytes);
}
int
dsl_get_written(dsl_dataset_t *ds, uint64_t *written)
{
dsl_pool_t *dp = ds->ds_dir->dd_pool;
dsl_dataset_t *prev;
int err = dsl_dataset_hold_obj(dp,
dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev);
if (err == 0) {
uint64_t comp, uncomp;
err = dsl_dataset_space_written(prev, ds, written,
&comp, &uncomp);
dsl_dataset_rele(prev, FTAG);
}
return (err);
}
/*
* 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN.
*/
int
dsl_get_prev_snap(dsl_dataset_t *ds, char *snap)
{
dsl_pool_t *dp = ds->ds_dir->dd_pool;
if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) {
dsl_dataset_name(ds->ds_prev, snap);
return (0);
} else {
return (SET_ERROR(ENOENT));
}
}
void
dsl_get_redact_snaps(dsl_dataset_t *ds, nvlist_t *propval)
{
uint64_t nsnaps;
uint64_t *snaps;
if (dsl_dataset_get_uint64_array_feature(ds,
SPA_FEATURE_REDACTED_DATASETS, &nsnaps, &snaps)) {
fnvlist_add_uint64_array(propval, ZPROP_VALUE, snaps,
nsnaps);
}
}
/*
* Returns the mountpoint property and source for the given dataset in the value
* and source buffers. The value buffer must be at least as large as MAXPATHLEN
* and the source buffer as least as large a ZFS_MAX_DATASET_NAME_LEN.
* Returns 0 on success and an error on failure.
*/
int
dsl_get_mountpoint(dsl_dataset_t *ds, const char *dsname, char *value,
char *source)
{
int error;
dsl_pool_t *dp = ds->ds_dir->dd_pool;
/* Retrieve the mountpoint value stored in the zap object */
error = dsl_prop_get_ds(ds, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), 1,
ZAP_MAXVALUELEN, value, source);
if (error != 0) {
return (error);
}
/*
* Process the dsname and source to find the full mountpoint string.
* Can be skipped for 'legacy' or 'none'.
*/
if (value[0] == '/') {
char *buf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP);
char *root = buf;
const char *relpath;
/*
* If we inherit the mountpoint, even from a dataset
* with a received value, the source will be the path of
* the dataset we inherit from. If source is
* ZPROP_SOURCE_VAL_RECVD, the received value is not
* inherited.
*/
if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) {
relpath = "";
} else {
ASSERT0(strncmp(dsname, source, strlen(source)));
relpath = dsname + strlen(source);
if (relpath[0] == '/')
relpath++;
}
spa_altroot(dp->dp_spa, root, ZAP_MAXVALUELEN);
/*
* Special case an alternate root of '/'. This will
* avoid having multiple leading slashes in the
* mountpoint path.
*/
if (strcmp(root, "/") == 0)
root++;
/*
* If the mountpoint is '/' then skip over this
* if we are obtaining either an alternate root or
* an inherited mountpoint.
*/
char *mnt = value;
if (value[1] == '\0' && (root[0] != '\0' ||
relpath[0] != '\0'))
mnt = value + 1;
mnt = kmem_strdup(mnt);
if (relpath[0] == '\0') {
(void) snprintf(value, ZAP_MAXVALUELEN, "%s%s",
root, mnt);
} else {
(void) snprintf(value, ZAP_MAXVALUELEN, "%s%s%s%s",
root, mnt, relpath[0] == '@' ? "" : "/",
relpath);
}
kmem_free(buf, ZAP_MAXVALUELEN);
kmem_strfree(mnt);
}
return (0);
}
void
dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv)
{
dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool;
ASSERT(dsl_pool_config_held(dp));
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO,
dsl_get_refratio(ds));
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED,
dsl_get_logicalreferenced(ds));
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO,
dsl_get_compressratio(ds));
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
dsl_get_used(ds));
if (ds->ds_is_snapshot) {
get_clones_stat(ds, nv);
} else {
char buf[ZFS_MAX_DATASET_NAME_LEN];
if (dsl_get_prev_snap(ds, buf) == 0)
dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP,
buf);
dsl_dir_stats(ds->ds_dir, nv);
}
nvlist_t *propval = fnvlist_alloc();
dsl_get_redact_snaps(ds, propval);
fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS),
propval);
nvlist_free(propval);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE,
dsl_get_available(ds));
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED,
dsl_get_referenced(ds));
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION,
dsl_get_creation(ds));
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG,
dsl_get_creationtxg(ds));
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA,
dsl_get_refquota(ds));
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION,
dsl_get_refreservation(ds));
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID,
dsl_get_guid(ds));
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE,
dsl_get_unique(ds));
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID,
dsl_get_objsetid(ds));
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS,
dsl_get_userrefs(ds));
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY,
dsl_get_defer_destroy(ds));
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_SNAPSHOTS_CHANGED,
dsl_dir_snap_cmtime(ds->ds_dir).tv_sec);
dsl_dataset_crypt_stats(ds, nv);
if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
uint64_t written;
if (dsl_get_written(ds, &written) == 0) {
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN,
written);
}
}
if (!dsl_dataset_is_snapshot(ds)) {
char *token = get_receive_resume_token(ds);
if (token != NULL) {
dsl_prop_nvlist_add_string(nv,
ZFS_PROP_RECEIVE_RESUME_TOKEN, token);
kmem_strfree(token);
}
}
}
void
dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat)
{
dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool;
ASSERT(dsl_pool_config_held(dp));
stat->dds_creation_txg = dsl_get_creationtxg(ds);
stat->dds_inconsistent = dsl_get_inconsistent(ds);
stat->dds_guid = dsl_get_guid(ds);
stat->dds_redacted = dsl_get_redacted(ds);
stat->dds_origin[0] = '\0';
if (ds->ds_is_snapshot) {
stat->dds_is_snapshot = B_TRUE;
stat->dds_num_clones = dsl_get_numclones(ds);
} else {
stat->dds_is_snapshot = B_FALSE;
stat->dds_num_clones = 0;
if (dsl_dir_is_clone(ds->ds_dir)) {
dsl_dir_get_origin(ds->ds_dir, stat->dds_origin);
}
}
}
uint64_t
dsl_dataset_fsid_guid(dsl_dataset_t *ds)
{
return (ds->ds_fsid_guid);
}
void
dsl_dataset_space(dsl_dataset_t *ds,
uint64_t *refdbytesp, uint64_t *availbytesp,
uint64_t *usedobjsp, uint64_t *availobjsp)
{
*refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes;
*availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE);
if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes)
*availbytesp +=
ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes;
if (ds->ds_quota != 0) {
/*
* Adjust available bytes according to refquota
*/
if (*refdbytesp < ds->ds_quota)
*availbytesp = MIN(*availbytesp,
ds->ds_quota - *refdbytesp);
else
*availbytesp = 0;
}
rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
*usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp);
rrw_exit(&ds->ds_bp_rwlock, FTAG);
*availobjsp = DN_MAX_OBJECT - *usedobjsp;
}
boolean_t
dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap)
{
dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool;
uint64_t birth;
ASSERT(dsl_pool_config_held(dp));
if (snap == NULL)
return (B_FALSE);
rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
birth = dsl_dataset_get_blkptr(ds)->blk_birth;
rrw_exit(&ds->ds_bp_rwlock, FTAG);
if (birth > dsl_dataset_phys(snap)->ds_creation_txg) {
objset_t *os, *os_snap;
/*
* It may be that only the ZIL differs, because it was
* reset in the head. Don't count that as being
* modified.
*/
if (dmu_objset_from_ds(ds, &os) != 0)
return (B_TRUE);
if (dmu_objset_from_ds(snap, &os_snap) != 0)
return (B_TRUE);
return (memcmp(&os->os_phys->os_meta_dnode,
&os_snap->os_phys->os_meta_dnode,
sizeof (os->os_phys->os_meta_dnode)) != 0);
}
return (B_FALSE);
}
static int
dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp,
dsl_dataset_t *hds, void *arg)
{
(void) dp;
dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
int error;
uint64_t val;
error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
if (error != 0) {
/* ignore nonexistent snapshots */
return (error == ENOENT ? 0 : error);
}
/* new name should not exist */
error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val);
if (error == 0)
error = SET_ERROR(EEXIST);
else if (error == ENOENT)
error = 0;
/* dataset name + 1 for the "@" + the new snapshot name must fit */
if (dsl_dir_namelen(hds->ds_dir) + 1 +
strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN)
error = SET_ERROR(ENAMETOOLONG);
return (error);
}
int
dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx)
{
dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *hds;
int error;
error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds);
if (error != 0)
return (error);
if (ddrsa->ddrsa_recursive) {
error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
dsl_dataset_rename_snapshot_check_impl, ddrsa,
DS_FIND_CHILDREN);
} else {
error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa);
}
dsl_dataset_rele(hds, FTAG);
return (error);
}
static int
dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp,
dsl_dataset_t *hds, void *arg)
{
dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
dsl_dataset_t *ds;
uint64_t val;
dmu_tx_t *tx = ddrsa->ddrsa_tx;
int error;
error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
ASSERT(error == 0 || error == ENOENT);
if (error == ENOENT) {
/* ignore nonexistent snapshots */
return (0);
}
VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds));
/* log before we change the name */
spa_history_log_internal_ds(ds, "rename", tx,
"-> @%s", ddrsa->ddrsa_newsnapname);
VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx,
B_FALSE));
mutex_enter(&ds->ds_lock);
(void) strlcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname,
sizeof (ds->ds_snapname));
mutex_exit(&ds->ds_lock);
VERIFY0(zap_add(dp->dp_meta_objset,
dsl_dataset_phys(hds)->ds_snapnames_zapobj,
ds->ds_snapname, 8, 1, &ds->ds_object, tx));
zvol_rename_minors(dp->dp_spa, ddrsa->ddrsa_oldsnapname,
ddrsa->ddrsa_newsnapname, B_TRUE);
dsl_dataset_rele(ds, FTAG);
return (0);
}
void
dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx)
{
dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *hds = NULL;
VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds));
ddrsa->ddrsa_tx = tx;
if (ddrsa->ddrsa_recursive) {
VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
dsl_dataset_rename_snapshot_sync_impl, ddrsa,
DS_FIND_CHILDREN));
} else {
VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa));
}
dsl_dataset_rele(hds, FTAG);
}
int
dsl_dataset_rename_snapshot(const char *fsname,
const char *oldsnapname, const char *newsnapname, boolean_t recursive)
{
dsl_dataset_rename_snapshot_arg_t ddrsa;
ddrsa.ddrsa_fsname = fsname;
ddrsa.ddrsa_oldsnapname = oldsnapname;
ddrsa.ddrsa_newsnapname = newsnapname;
ddrsa.ddrsa_recursive = recursive;
return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check,
dsl_dataset_rename_snapshot_sync, &ddrsa,
1, ZFS_SPACE_CHECK_RESERVED));
}
/*
* If we're doing an ownership handoff, we need to make sure that there is
* only one long hold on the dataset. We're not allowed to change anything here
* so we don't permanently release the long hold or regular hold here. We want
* to do this only when syncing to avoid the dataset unexpectedly going away
* when we release the long hold.
*/
static int
dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx)
{
boolean_t held = B_FALSE;
if (!dmu_tx_is_syncing(tx))
return (0);
dsl_dir_t *dd = ds->ds_dir;
mutex_enter(&dd->dd_activity_lock);
uint64_t holds = zfs_refcount_count(&ds->ds_longholds) -
(owner != NULL ? 1 : 0);
/*
* The value of dd_activity_waiters can chance as soon as we drop the
* lock, but we're fine with that; new waiters coming in or old
* waiters leaving doesn't cause problems, since we're going to cancel
* waiters later anyway. The goal of this check is to verify that no
* non-waiters have long-holds, and all new long-holds will be
* prevented because we're holding the pool config as writer.
*/
if (holds != dd->dd_activity_waiters)
held = B_TRUE;
mutex_exit(&dd->dd_activity_lock);
if (held)
return (SET_ERROR(EBUSY));
return (0);
}
int
dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx)
{
dsl_dataset_rollback_arg_t *ddra = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *ds;
int64_t unused_refres_delta;
int error;
error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds);
if (error != 0)
return (error);
/* must not be a snapshot */
if (ds->ds_is_snapshot) {
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(EINVAL));
}
/* must have a most recent snapshot */
if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) {
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(ESRCH));
}
/*
* No rollback to a snapshot created in the current txg, because
* the rollback may dirty the dataset and create blocks that are
* not reachable from the rootbp while having a birth txg that
* falls into the snapshot's range.
*/
if (dmu_tx_is_syncing(tx) &&
dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) {
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(EAGAIN));
}
/*
* If the expected target snapshot is specified, then check that
* the latest snapshot is it.
*/
if (ddra->ddra_tosnap != NULL) {
dsl_dataset_t *snapds;
/* Check if the target snapshot exists at all. */
error = dsl_dataset_hold(dp, ddra->ddra_tosnap, FTAG, &snapds);
if (error != 0) {
/*
* ESRCH is used to signal that the target snapshot does
* not exist, while ENOENT is used to report that
* the rolled back dataset does not exist.
* ESRCH is also used to cover other cases where the
* target snapshot is not related to the dataset being
* rolled back such as being in a different pool.
*/
if (error == ENOENT || error == EXDEV)
error = SET_ERROR(ESRCH);
dsl_dataset_rele(ds, FTAG);
return (error);
}
ASSERT(snapds->ds_is_snapshot);
/* Check if the snapshot is the latest snapshot indeed. */
if (snapds != ds->ds_prev) {
/*
* Distinguish between the case where the only problem
* is intervening snapshots (EEXIST) vs the snapshot
* not being a valid target for rollback (ESRCH).
*/
if (snapds->ds_dir == ds->ds_dir ||
(dsl_dir_is_clone(ds->ds_dir) &&
dsl_dir_phys(ds->ds_dir)->dd_origin_obj ==
snapds->ds_object)) {
error = SET_ERROR(EEXIST);
} else {
error = SET_ERROR(ESRCH);
}
dsl_dataset_rele(snapds, FTAG);
dsl_dataset_rele(ds, FTAG);
return (error);
}
dsl_dataset_rele(snapds, FTAG);
}
/* must not have any bookmarks after the most recent snapshot */
if (dsl_bookmark_latest_txg(ds) >
dsl_dataset_phys(ds)->ds_prev_snap_txg) {
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(EEXIST));
}
error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx);
if (error != 0) {
dsl_dataset_rele(ds, FTAG);
return (error);
}
/*
* Check if the snap we are rolling back to uses more than
* the refquota.
*/
if (ds->ds_quota != 0 &&
dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) {
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(EDQUOT));
}
/*
* When we do the clone swap, we will temporarily use more space
* due to the refreservation (the head will no longer have any
* unique space, so the entire amount of the refreservation will need
* to be free). We will immediately destroy the clone, freeing
* this space, but the freeing happens over many txg's.
*/
unused_refres_delta = (int64_t)MIN(ds->ds_reserved,
dsl_dataset_phys(ds)->ds_unique_bytes);
if (unused_refres_delta > 0 &&
unused_refres_delta >
dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) {
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(ENOSPC));
}
dsl_dataset_rele(ds, FTAG);
return (0);
}
void
dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx)
{
dsl_dataset_rollback_arg_t *ddra = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *ds, *clone;
uint64_t cloneobj;
char namebuf[ZFS_MAX_DATASET_NAME_LEN];
VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds));
dsl_dataset_name(ds->ds_prev, namebuf);
fnvlist_add_string(ddra->ddra_result, "target", namebuf);
cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback",
ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, NULL, tx);
VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone));
dsl_dataset_clone_swap_sync_impl(clone, ds, tx);
dsl_dataset_zero_zil(ds, tx);
dsl_destroy_head_sync_impl(clone, tx);
dsl_dataset_rele(clone, FTAG);
dsl_dataset_rele(ds, FTAG);
}
/*
* Rolls back the given filesystem or volume to the most recent snapshot.
* The name of the most recent snapshot will be returned under key "target"
* in the result nvlist.
*
* If owner != NULL:
* - The existing dataset MUST be owned by the specified owner at entry
* - Upon return, dataset will still be held by the same owner, whether we
* succeed or not.
*
* This mode is required any time the existing filesystem is mounted. See
* notes above zfs_suspend_fs() for further details.
*/
int
dsl_dataset_rollback(const char *fsname, const char *tosnap, void *owner,
nvlist_t *result)
{
dsl_dataset_rollback_arg_t ddra;
ddra.ddra_fsname = fsname;
ddra.ddra_tosnap = tosnap;
ddra.ddra_owner = owner;
ddra.ddra_result = result;
return (dsl_sync_task(fsname, dsl_dataset_rollback_check,
dsl_dataset_rollback_sync, &ddra,
1, ZFS_SPACE_CHECK_RESERVED));
}
struct promotenode {
list_node_t link;
dsl_dataset_t *ds;
};
static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep);
static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp,
const void *tag);
static void promote_rele(dsl_dataset_promote_arg_t *ddpa, const void *tag);
int
dsl_dataset_promote_check(void *arg, dmu_tx_t *tx)
{
dsl_dataset_promote_arg_t *ddpa = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *hds;
struct promotenode *snap;
int err;
uint64_t unused;
uint64_t ss_mv_cnt;
size_t max_snap_len;
boolean_t conflicting_snaps;
err = promote_hold(ddpa, dp, FTAG);
if (err != 0)
return (err);
hds = ddpa->ddpa_clone;
max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1;
if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) {
promote_rele(ddpa, FTAG);
return (SET_ERROR(EXDEV));
}
snap = list_head(&ddpa->shared_snaps);
if (snap == NULL) {
err = SET_ERROR(ENOENT);
goto out;
}
dsl_dataset_t *const origin_ds = snap->ds;
/*
* Encrypted clones share a DSL Crypto Key with their origin's dsl dir.
* When doing a promote we must make sure the encryption root for
* both the target and the target's origin does not change to avoid
* needing to rewrap encryption keys
*/
err = dsl_dataset_promote_crypt_check(hds->ds_dir, origin_ds->ds_dir);
if (err != 0)
goto out;
/*
* Compute and check the amount of space to transfer. Since this is
* so expensive, don't do the preliminary check.
*/
if (!dmu_tx_is_syncing(tx)) {
promote_rele(ddpa, FTAG);
return (0);
}
/* compute origin's new unique space */
snap = list_tail(&ddpa->clone_snaps);
ASSERT(snap != NULL);
ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
origin_ds->ds_object);
dsl_deadlist_space_range(&snap->ds->ds_deadlist,
dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX,
&ddpa->unique, &unused, &unused);
/*
* Walk the snapshots that we are moving
*
* Compute space to transfer. Consider the incremental changes
* to used by each snapshot:
* (my used) = (prev's used) + (blocks born) - (blocks killed)
* So each snapshot gave birth to:
* (blocks born) = (my used) - (prev's used) + (blocks killed)
* So a sequence would look like:
* (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
* Which simplifies to:
* uN + kN + kN-1 + ... + k1 + k0
* Note however, if we stop before we reach the ORIGIN we get:
* uN + kN + kN-1 + ... + kM - uM-1
*/
conflicting_snaps = B_FALSE;
ss_mv_cnt = 0;
ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes;
ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes;
ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes;
for (snap = list_head(&ddpa->shared_snaps); snap;
snap = list_next(&ddpa->shared_snaps, snap)) {
uint64_t val, dlused, dlcomp, dluncomp;
dsl_dataset_t *ds = snap->ds;
ss_mv_cnt++;
/*
* If there are long holds, we won't be able to evict
* the objset.
*/
if (dsl_dataset_long_held(ds)) {
err = SET_ERROR(EBUSY);
goto out;
}
/* Check that the snapshot name does not conflict */
VERIFY0(dsl_dataset_get_snapname(ds));
if (strlen(ds->ds_snapname) >= max_snap_len) {
err = SET_ERROR(ENAMETOOLONG);
goto out;
}
err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val);
if (err == 0) {
fnvlist_add_boolean(ddpa->err_ds,
snap->ds->ds_snapname);
conflicting_snaps = B_TRUE;
} else if (err != ENOENT) {
goto out;
}
/* The very first snapshot does not have a deadlist */
if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0)
continue;
dsl_deadlist_space(&ds->ds_deadlist,
&dlused, &dlcomp, &dluncomp);
ddpa->used += dlused;
ddpa->comp += dlcomp;
ddpa->uncomp += dluncomp;
}
/*
* Check that bookmarks that are being transferred don't have
* name conflicts.
*/
for (dsl_bookmark_node_t *dbn = avl_first(&origin_ds->ds_bookmarks);
dbn != NULL && dbn->dbn_phys.zbm_creation_txg <=
dsl_dataset_phys(origin_ds)->ds_creation_txg;
dbn = AVL_NEXT(&origin_ds->ds_bookmarks, dbn)) {
if (strlen(dbn->dbn_name) >= max_snap_len) {
err = SET_ERROR(ENAMETOOLONG);
goto out;
}
zfs_bookmark_phys_t bm;
err = dsl_bookmark_lookup_impl(ddpa->ddpa_clone,
dbn->dbn_name, &bm);
if (err == 0) {
fnvlist_add_boolean(ddpa->err_ds, dbn->dbn_name);
conflicting_snaps = B_TRUE;
} else if (err == ESRCH) {
err = 0;
}
if (err != 0) {
goto out;
}
}
/*
* In order to return the full list of conflicting snapshots, we check
* whether there was a conflict after traversing all of them.
*/
if (conflicting_snaps) {
err = SET_ERROR(EEXIST);
goto out;
}
/*
* If we are a clone of a clone then we never reached ORIGIN,
* so we need to subtract out the clone origin's used space.
*/
if (ddpa->origin_origin) {
ddpa->used -=
dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes;
ddpa->comp -=
dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes;
ddpa->uncomp -=
dsl_dataset_phys(ddpa->origin_origin)->
ds_uncompressed_bytes;
}
/* Check that there is enough space and limit headroom here */
err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir,
0, ss_mv_cnt, ddpa->used, ddpa->cr, ddpa->proc);
if (err != 0)
goto out;
/*
* Compute the amounts of space that will be used by snapshots
* after the promotion (for both origin and clone). For each,
* it is the amount of space that will be on all of their
* deadlists (that was not born before their new origin).
*/
if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
uint64_t space;
/*
* Note, typically this will not be a clone of a clone,
* so dd_origin_txg will be < TXG_INITIAL, so
* these snaplist_space() -> dsl_deadlist_space_range()
* calls will be fast because they do not have to
* iterate over all bps.
*/
snap = list_head(&ddpa->origin_snaps);
if (snap == NULL) {
err = SET_ERROR(ENOENT);
goto out;
}
err = snaplist_space(&ddpa->shared_snaps,
snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap);
if (err != 0)
goto out;
err = snaplist_space(&ddpa->clone_snaps,
snap->ds->ds_dir->dd_origin_txg, &space);
if (err != 0)
goto out;
ddpa->cloneusedsnap += space;
}
if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags &
DD_FLAG_USED_BREAKDOWN) {
err = snaplist_space(&ddpa->origin_snaps,
dsl_dataset_phys(origin_ds)->ds_creation_txg,
&ddpa->originusedsnap);
if (err != 0)
goto out;
}
out:
promote_rele(ddpa, FTAG);
return (err);
}
void
dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx)
{
dsl_dataset_promote_arg_t *ddpa = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *hds;
struct promotenode *snap;
dsl_dataset_t *origin_ds;
dsl_dataset_t *origin_head;
dsl_dir_t *dd;
dsl_dir_t *odd = NULL;
uint64_t oldnext_obj;
int64_t delta;
ASSERT(nvlist_empty(ddpa->err_ds));
VERIFY0(promote_hold(ddpa, dp, FTAG));
hds = ddpa->ddpa_clone;
ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE);
snap = list_head(&ddpa->shared_snaps);
origin_ds = snap->ds;
dd = hds->ds_dir;
snap = list_head(&ddpa->origin_snaps);
origin_head = snap->ds;
/*
* We need to explicitly open odd, since origin_ds's dd will be
* changing.
*/
VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object,
NULL, FTAG, &odd));
dsl_dataset_promote_crypt_sync(hds->ds_dir, odd, tx);
/* change origin's next snap */
dmu_buf_will_dirty(origin_ds->ds_dbuf, tx);
oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj;
snap = list_tail(&ddpa->clone_snaps);
ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
origin_ds->ds_object);
dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object;
/* change the origin's next clone */
if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) {
dsl_dataset_remove_from_next_clones(origin_ds,
snap->ds->ds_object, tx);
VERIFY0(zap_add_int(dp->dp_meta_objset,
dsl_dataset_phys(origin_ds)->ds_next_clones_obj,
oldnext_obj, tx));
}
/* change origin */
dmu_buf_will_dirty(dd->dd_dbuf, tx);
ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object);
dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj;
dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg;
dmu_buf_will_dirty(odd->dd_dbuf, tx);
dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object;
origin_head->ds_dir->dd_origin_txg =
dsl_dataset_phys(origin_ds)->ds_creation_txg;
/* change dd_clone entries */
if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
VERIFY0(zap_remove_int(dp->dp_meta_objset,
dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx));
VERIFY0(zap_add_int(dp->dp_meta_objset,
dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
hds->ds_object, tx));
VERIFY0(zap_remove_int(dp->dp_meta_objset,
dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
origin_head->ds_object, tx));
if (dsl_dir_phys(dd)->dd_clones == 0) {
dsl_dir_phys(dd)->dd_clones =
zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES,
DMU_OT_NONE, 0, tx);
}
VERIFY0(zap_add_int(dp->dp_meta_objset,
dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx));
}
/*
* Move bookmarks to this dir.
*/
dsl_bookmark_node_t *dbn_next;
for (dsl_bookmark_node_t *dbn = avl_first(&origin_head->ds_bookmarks);
dbn != NULL && dbn->dbn_phys.zbm_creation_txg <=
dsl_dataset_phys(origin_ds)->ds_creation_txg;
dbn = dbn_next) {
dbn_next = AVL_NEXT(&origin_head->ds_bookmarks, dbn);
avl_remove(&origin_head->ds_bookmarks, dbn);
VERIFY0(zap_remove(dp->dp_meta_objset,
origin_head->ds_bookmarks_obj, dbn->dbn_name, tx));
dsl_bookmark_node_add(hds, dbn, tx);
}
dsl_bookmark_next_changed(hds, origin_ds, tx);
/* move snapshots to this dir */
for (snap = list_head(&ddpa->shared_snaps); snap;
snap = list_next(&ddpa->shared_snaps, snap)) {
dsl_dataset_t *ds = snap->ds;
/*
* Property callbacks are registered to a particular
* dsl_dir. Since ours is changing, evict the objset
* so that they will be unregistered from the old dsl_dir.
*/
if (ds->ds_objset) {
dmu_objset_evict(ds->ds_objset);
ds->ds_objset = NULL;
}
/* move snap name entry */
VERIFY0(dsl_dataset_get_snapname(ds));
VERIFY0(dsl_dataset_snap_remove(origin_head,
ds->ds_snapname, tx, B_TRUE));
VERIFY0(zap_add(dp->dp_meta_objset,
dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname,
8, 1, &ds->ds_object, tx));
dsl_fs_ss_count_adjust(hds->ds_dir, 1,
DD_FIELD_SNAPSHOT_COUNT, tx);
/* change containing dsl_dir */
dmu_buf_will_dirty(ds->ds_dbuf, tx);
ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object);
dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object;
ASSERT3P(ds->ds_dir, ==, odd);
dsl_dir_rele(ds->ds_dir, ds);
VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object,
NULL, ds, &ds->ds_dir));
/* move any clone references */
if (dsl_dataset_phys(ds)->ds_next_clones_obj &&
spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
zap_cursor_t zc;
zap_attribute_t za;
for (zap_cursor_init(&zc, dp->dp_meta_objset,
dsl_dataset_phys(ds)->ds_next_clones_obj);
zap_cursor_retrieve(&zc, &za) == 0;
zap_cursor_advance(&zc)) {
dsl_dataset_t *cnds;
uint64_t o;
if (za.za_first_integer == oldnext_obj) {
/*
* We've already moved the
* origin's reference.
*/
continue;
}
VERIFY0(dsl_dataset_hold_obj(dp,
za.za_first_integer, FTAG, &cnds));
o = dsl_dir_phys(cnds->ds_dir)->
dd_head_dataset_obj;
VERIFY0(zap_remove_int(dp->dp_meta_objset,
dsl_dir_phys(odd)->dd_clones, o, tx));
VERIFY0(zap_add_int(dp->dp_meta_objset,
dsl_dir_phys(dd)->dd_clones, o, tx));
dsl_dataset_rele(cnds, FTAG);
}
zap_cursor_fini(&zc);
}
ASSERT(!dsl_prop_hascb(ds));
}
/*
* Change space accounting.
* Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
* both be valid, or both be 0 (resulting in delta == 0). This
* is true for each of {clone,origin} independently.
*/
delta = ddpa->cloneusedsnap -
dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP];
ASSERT3S(delta, >=, 0);
ASSERT3U(ddpa->used, >=, delta);
dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx);
dsl_dir_diduse_space(dd, DD_USED_HEAD,
ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx);
delta = ddpa->originusedsnap -
dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP];
ASSERT3S(delta, <=, 0);
ASSERT3U(ddpa->used, >=, -delta);
dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx);
dsl_dir_diduse_space(odd, DD_USED_HEAD,
-ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx);
dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique;
/*
* Since livelists are specific to a clone's origin txg, they
* are no longer accurate. Destroy the livelist from the clone being
* promoted. If the origin dataset is a clone, destroy its livelist
* as well.
*/
dsl_dir_remove_livelist(dd, tx, B_TRUE);
dsl_dir_remove_livelist(odd, tx, B_TRUE);
/* log history record */
spa_history_log_internal_ds(hds, "promote", tx, " ");
dsl_dir_rele(odd, FTAG);
promote_rele(ddpa, FTAG);
/*
* Transfer common error blocks from old head to new head.
*/
if (spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_HEAD_ERRLOG)) {
uint64_t old_head = origin_head->ds_object;
uint64_t new_head = hds->ds_object;
spa_swap_errlog(dp->dp_spa, new_head, old_head, tx);
}
}
/*
* Make a list of dsl_dataset_t's for the snapshots between first_obj
* (exclusive) and last_obj (inclusive). The list will be in reverse
* order (last_obj will be the list_head()). If first_obj == 0, do all
* snapshots back to this dataset's origin.
*/
static int
snaplist_make(dsl_pool_t *dp,
uint64_t first_obj, uint64_t last_obj, list_t *l, const void *tag)
{
uint64_t obj = last_obj;
list_create(l, sizeof (struct promotenode),
offsetof(struct promotenode, link));
while (obj != first_obj) {
dsl_dataset_t *ds;
struct promotenode *snap;
int err;
err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
ASSERT(err != ENOENT);
if (err != 0)
return (err);
if (first_obj == 0)
first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj;
snap = kmem_alloc(sizeof (*snap), KM_SLEEP);
snap->ds = ds;
list_insert_tail(l, snap);
obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
}
return (0);
}
static int
snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep)
{
struct promotenode *snap;
*spacep = 0;
for (snap = list_head(l); snap; snap = list_next(l, snap)) {
uint64_t used, comp, uncomp;
dsl_deadlist_space_range(&snap->ds->ds_deadlist,
mintxg, UINT64_MAX, &used, &comp, &uncomp);
*spacep += used;
}
return (0);
}
static void
snaplist_destroy(list_t *l, const void *tag)
{
struct promotenode *snap;
if (l == NULL || !list_link_active(&l->list_head))
return;
while ((snap = list_tail(l)) != NULL) {
list_remove(l, snap);
dsl_dataset_rele(snap->ds, tag);
kmem_free(snap, sizeof (*snap));
}
list_destroy(l);
}
static int
promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, const void *tag)
{
int error;
dsl_dir_t *dd;
struct promotenode *snap;
error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag,
&ddpa->ddpa_clone);
if (error != 0)
return (error);
dd = ddpa->ddpa_clone->ds_dir;
if (ddpa->ddpa_clone->ds_is_snapshot ||
!dsl_dir_is_clone(dd)) {
dsl_dataset_rele(ddpa->ddpa_clone, tag);
return (SET_ERROR(EINVAL));
}
error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj,
&ddpa->shared_snaps, tag);
if (error != 0)
goto out;
error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object,
&ddpa->clone_snaps, tag);
if (error != 0)
goto out;
snap = list_head(&ddpa->shared_snaps);
ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj);
error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj,
dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj,
&ddpa->origin_snaps, tag);
if (error != 0)
goto out;
if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) {
error = dsl_dataset_hold_obj(dp,
dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj,
tag, &ddpa->origin_origin);
if (error != 0)
goto out;
}
out:
if (error != 0)
promote_rele(ddpa, tag);
return (error);
}
static void
promote_rele(dsl_dataset_promote_arg_t *ddpa, const void *tag)
{
snaplist_destroy(&ddpa->shared_snaps, tag);
snaplist_destroy(&ddpa->clone_snaps, tag);
snaplist_destroy(&ddpa->origin_snaps, tag);
if (ddpa->origin_origin != NULL)
dsl_dataset_rele(ddpa->origin_origin, tag);
dsl_dataset_rele(ddpa->ddpa_clone, tag);
}
/*
* Promote a clone.
*
* If it fails due to a conflicting snapshot name, "conflsnap" will be filled
* in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.)
*/
int
dsl_dataset_promote(const char *name, char *conflsnap)
{
dsl_dataset_promote_arg_t ddpa = { 0 };
uint64_t numsnaps;
int error;
nvpair_t *snap_pair;
objset_t *os;
/*
* We will modify space proportional to the number of
* snapshots. Compute numsnaps.
*/
error = dmu_objset_hold(name, FTAG, &os);
if (error != 0)
return (error);
error = zap_count(dmu_objset_pool(os)->dp_meta_objset,
dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj,
&numsnaps);
dmu_objset_rele(os, FTAG);
if (error != 0)
return (error);
ddpa.ddpa_clonename = name;
ddpa.err_ds = fnvlist_alloc();
ddpa.cr = CRED();
ddpa.proc = curproc;
error = dsl_sync_task(name, dsl_dataset_promote_check,
dsl_dataset_promote_sync, &ddpa,
2 + numsnaps, ZFS_SPACE_CHECK_RESERVED);
/*
* Return the first conflicting snapshot found.
*/
snap_pair = nvlist_next_nvpair(ddpa.err_ds, NULL);
if (snap_pair != NULL && conflsnap != NULL)
(void) strlcpy(conflsnap, nvpair_name(snap_pair),
ZFS_MAX_DATASET_NAME_LEN);
fnvlist_free(ddpa.err_ds);
return (error);
}
int
dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx)
{
/*
* "slack" factor for received datasets with refquota set on them.
* See the bottom of this function for details on its use.
*/
uint64_t refquota_slack = (uint64_t)DMU_MAX_ACCESS *
spa_asize_inflation;
int64_t unused_refres_delta;
/* they should both be heads */
if (clone->ds_is_snapshot ||
origin_head->ds_is_snapshot)
return (SET_ERROR(EINVAL));
/* if we are not forcing, the branch point should be just before them */
if (!force && clone->ds_prev != origin_head->ds_prev)
return (SET_ERROR(EINVAL));
/* clone should be the clone (unless they are unrelated) */
if (clone->ds_prev != NULL &&
clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap &&
origin_head->ds_dir != clone->ds_prev->ds_dir)
return (SET_ERROR(EINVAL));
/* the clone should be a child of the origin */
if (clone->ds_dir->dd_parent != origin_head->ds_dir)
return (SET_ERROR(EINVAL));
/* origin_head shouldn't be modified unless 'force' */
if (!force &&
dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev))
return (SET_ERROR(ETXTBSY));
/* origin_head should have no long holds (e.g. is not mounted) */
if (dsl_dataset_handoff_check(origin_head, owner, tx))
return (SET_ERROR(EBUSY));
/* check amount of any unconsumed refreservation */
unused_refres_delta =
(int64_t)MIN(origin_head->ds_reserved,
dsl_dataset_phys(origin_head)->ds_unique_bytes) -
(int64_t)MIN(origin_head->ds_reserved,
dsl_dataset_phys(clone)->ds_unique_bytes);
if (unused_refres_delta > 0 &&
unused_refres_delta >
dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE))
return (SET_ERROR(ENOSPC));
/*
* The clone can't be too much over the head's refquota.
*
* To ensure that the entire refquota can be used, we allow one
* transaction to exceed the refquota. Therefore, this check
* needs to also allow for the space referenced to be more than the
* refquota. The maximum amount of space that one transaction can use
* on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this
* overage ensures that we are able to receive a filesystem that
* exceeds the refquota on the source system.
*
* So that overage is the refquota_slack we use below.
*/
if (origin_head->ds_quota != 0 &&
dsl_dataset_phys(clone)->ds_referenced_bytes >
origin_head->ds_quota + refquota_slack)
return (SET_ERROR(EDQUOT));
return (0);
}
static void
dsl_dataset_swap_remap_deadlists(dsl_dataset_t *clone,
dsl_dataset_t *origin, dmu_tx_t *tx)
{
uint64_t clone_remap_dl_obj, origin_remap_dl_obj;
dsl_pool_t *dp = dmu_tx_pool(tx);
ASSERT(dsl_pool_sync_context(dp));
clone_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(clone);
origin_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(origin);
if (clone_remap_dl_obj != 0) {
dsl_deadlist_close(&clone->ds_remap_deadlist);
dsl_dataset_unset_remap_deadlist_object(clone, tx);
}
if (origin_remap_dl_obj != 0) {
dsl_deadlist_close(&origin->ds_remap_deadlist);
dsl_dataset_unset_remap_deadlist_object(origin, tx);
}
if (clone_remap_dl_obj != 0) {
dsl_dataset_set_remap_deadlist_object(origin,
clone_remap_dl_obj, tx);
dsl_deadlist_open(&origin->ds_remap_deadlist,
dp->dp_meta_objset, clone_remap_dl_obj);
}
if (origin_remap_dl_obj != 0) {
dsl_dataset_set_remap_deadlist_object(clone,
origin_remap_dl_obj, tx);
dsl_deadlist_open(&clone->ds_remap_deadlist,
dp->dp_meta_objset, origin_remap_dl_obj);
}
}
void
dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
dsl_dataset_t *origin_head, dmu_tx_t *tx)
{
dsl_pool_t *dp = dmu_tx_pool(tx);
int64_t unused_refres_delta;
ASSERT(clone->ds_reserved == 0);
/*
* NOTE: On DEBUG kernels there could be a race between this and
* the check function if spa_asize_inflation is adjusted...
*/
ASSERT(origin_head->ds_quota == 0 ||
dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota +
DMU_MAX_ACCESS * spa_asize_inflation);
ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev);
dsl_dir_cancel_waiters(origin_head->ds_dir);
/*
* Swap per-dataset feature flags.
*/
for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
if (!(spa_feature_table[f].fi_flags &
ZFEATURE_FLAG_PER_DATASET)) {
ASSERT(!dsl_dataset_feature_is_active(clone, f));
ASSERT(!dsl_dataset_feature_is_active(origin_head, f));
continue;
}
boolean_t clone_inuse = dsl_dataset_feature_is_active(clone, f);
void *clone_feature = clone->ds_feature[f];
boolean_t origin_head_inuse =
dsl_dataset_feature_is_active(origin_head, f);
void *origin_head_feature = origin_head->ds_feature[f];
if (clone_inuse)
dsl_dataset_deactivate_feature_impl(clone, f, tx);
if (origin_head_inuse)
dsl_dataset_deactivate_feature_impl(origin_head, f, tx);
if (clone_inuse) {
dsl_dataset_activate_feature(origin_head->ds_object, f,
clone_feature, tx);
origin_head->ds_feature[f] = clone_feature;
}
if (origin_head_inuse) {
dsl_dataset_activate_feature(clone->ds_object, f,
origin_head_feature, tx);
clone->ds_feature[f] = origin_head_feature;
}
}
dmu_buf_will_dirty(clone->ds_dbuf, tx);
dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
if (clone->ds_objset != NULL) {
dmu_objset_evict(clone->ds_objset);
clone->ds_objset = NULL;
}
if (origin_head->ds_objset != NULL) {
dmu_objset_evict(origin_head->ds_objset);
origin_head->ds_objset = NULL;
}
unused_refres_delta =
(int64_t)MIN(origin_head->ds_reserved,
dsl_dataset_phys(origin_head)->ds_unique_bytes) -
(int64_t)MIN(origin_head->ds_reserved,
dsl_dataset_phys(clone)->ds_unique_bytes);
/*
* Reset origin's unique bytes.
*/
{
dsl_dataset_t *origin = clone->ds_prev;
uint64_t comp, uncomp;
dmu_buf_will_dirty(origin->ds_dbuf, tx);
dsl_deadlist_space_range(&clone->ds_deadlist,
dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX,
&dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp);
}
/* swap blkptrs */
{
rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG);
rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG);
blkptr_t tmp;
tmp = dsl_dataset_phys(origin_head)->ds_bp;
dsl_dataset_phys(origin_head)->ds_bp =
dsl_dataset_phys(clone)->ds_bp;
dsl_dataset_phys(clone)->ds_bp = tmp;
rrw_exit(&origin_head->ds_bp_rwlock, FTAG);
rrw_exit(&clone->ds_bp_rwlock, FTAG);
}
/* set dd_*_bytes */
{
int64_t dused, dcomp, duncomp;
uint64_t cdl_used, cdl_comp, cdl_uncomp;
uint64_t odl_used, odl_comp, odl_uncomp;
ASSERT3U(dsl_dir_phys(clone->ds_dir)->
dd_used_breakdown[DD_USED_SNAP], ==, 0);
dsl_deadlist_space(&clone->ds_deadlist,
&cdl_used, &cdl_comp, &cdl_uncomp);
dsl_deadlist_space(&origin_head->ds_deadlist,
&odl_used, &odl_comp, &odl_uncomp);
dused = dsl_dataset_phys(clone)->ds_referenced_bytes +
cdl_used -
(dsl_dataset_phys(origin_head)->ds_referenced_bytes +
odl_used);
dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes +
cdl_comp -
(dsl_dataset_phys(origin_head)->ds_compressed_bytes +
odl_comp);
duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes +
cdl_uncomp -
(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes +
odl_uncomp);
dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD,
dused, dcomp, duncomp, tx);
dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD,
-dused, -dcomp, -duncomp, tx);
/*
* The difference in the space used by snapshots is the
* difference in snapshot space due to the head's
* deadlist (since that's the only thing that's
* changing that affects the snapused).
*/
dsl_deadlist_space_range(&clone->ds_deadlist,
origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
&cdl_used, &cdl_comp, &cdl_uncomp);
dsl_deadlist_space_range(&origin_head->ds_deadlist,
origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
&odl_used, &odl_comp, &odl_uncomp);
dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used,
DD_USED_HEAD, DD_USED_SNAP, tx);
}
/* swap ds_*_bytes */
SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes,
dsl_dataset_phys(clone)->ds_referenced_bytes);
SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes,
dsl_dataset_phys(clone)->ds_compressed_bytes);
SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes,
dsl_dataset_phys(clone)->ds_uncompressed_bytes);
SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes,
dsl_dataset_phys(clone)->ds_unique_bytes);
/* apply any parent delta for change in unconsumed refreservation */
dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV,
unused_refres_delta, 0, 0, tx);
/*
* Swap deadlists.
*/
dsl_deadlist_close(&clone->ds_deadlist);
dsl_deadlist_close(&origin_head->ds_deadlist);
SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj,
dsl_dataset_phys(clone)->ds_deadlist_obj);
dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset,
dsl_dataset_phys(clone)->ds_deadlist_obj);
dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset,
dsl_dataset_phys(origin_head)->ds_deadlist_obj);
dsl_dataset_swap_remap_deadlists(clone, origin_head, tx);
/*
* If there is a bookmark at the origin, its "next dataset" is
* changing, so we need to reset its FBN.
*/
dsl_bookmark_next_changed(origin_head, origin_head->ds_prev, tx);
dsl_scan_ds_clone_swapped(origin_head, clone, tx);
/*
* Destroy any livelists associated with the clone or the origin,
* since after the swap the corresponding livelists are no longer
* valid.
*/
dsl_dir_remove_livelist(clone->ds_dir, tx, B_TRUE);
dsl_dir_remove_livelist(origin_head->ds_dir, tx, B_TRUE);
spa_history_log_internal_ds(clone, "clone swap", tx,
"parent=%s", origin_head->ds_dir->dd_myname);
}
/*
* Given a pool name and a dataset object number in that pool,
* return the name of that dataset.
*/
int
dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf)
{
dsl_pool_t *dp;
dsl_dataset_t *ds;
int error;
error = dsl_pool_hold(pname, FTAG, &dp);
if (error != 0)
return (error);
error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
if (error == 0) {
dsl_dataset_name(ds, buf);
dsl_dataset_rele(ds, FTAG);
}
dsl_pool_rele(dp, FTAG);
return (error);
}
int
dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv)
{
int error = 0;
ASSERT3S(asize, >, 0);
/*
* *ref_rsrv is the portion of asize that will come from any
* unconsumed refreservation space.
*/
*ref_rsrv = 0;
mutex_enter(&ds->ds_lock);
/*
* Make a space adjustment for reserved bytes.
*/
if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) {
ASSERT3U(*used, >=,
ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
*used -=
(ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
*ref_rsrv =
asize - MIN(asize, parent_delta(ds, asize + inflight));
}
if (!check_quota || ds->ds_quota == 0) {
mutex_exit(&ds->ds_lock);
return (0);
}
/*
* If they are requesting more space, and our current estimate
* is over quota, they get to try again unless the actual
* on-disk is over quota and there are no pending changes (which
* may free up space for us).
*/
if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >=
ds->ds_quota) {
if (inflight > 0 ||
dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota)
error = SET_ERROR(ERESTART);
else
error = SET_ERROR(EDQUOT);
}
mutex_exit(&ds->ds_lock);
return (error);
}
typedef struct dsl_dataset_set_qr_arg {
const char *ddsqra_name;
zprop_source_t ddsqra_source;
uint64_t ddsqra_value;
} dsl_dataset_set_qr_arg_t;
static int
dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx)
{
dsl_dataset_set_qr_arg_t *ddsqra = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *ds;
int error;
uint64_t newval;
if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA)
return (SET_ERROR(ENOTSUP));
error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
if (error != 0)
return (error);
if (ds->ds_is_snapshot) {
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(EINVAL));
}
error = dsl_prop_predict(ds->ds_dir,
zfs_prop_to_name(ZFS_PROP_REFQUOTA),
ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
if (error != 0) {
dsl_dataset_rele(ds, FTAG);
return (error);
}
if (newval == 0) {
dsl_dataset_rele(ds, FTAG);
return (0);
}
if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes ||
newval < ds->ds_reserved) {
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(ENOSPC));
}
dsl_dataset_rele(ds, FTAG);
return (0);
}
static void
dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx)
{
dsl_dataset_set_qr_arg_t *ddsqra = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *ds = NULL;
uint64_t newval;
VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
dsl_prop_set_sync_impl(ds,
zfs_prop_to_name(ZFS_PROP_REFQUOTA),
ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
&ddsqra->ddsqra_value, tx);
VERIFY0(dsl_prop_get_int_ds(ds,
zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval));
if (ds->ds_quota != newval) {
dmu_buf_will_dirty(ds->ds_dbuf, tx);
ds->ds_quota = newval;
}
dsl_dataset_rele(ds, FTAG);
}
int
dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
uint64_t refquota)
{
dsl_dataset_set_qr_arg_t ddsqra;
ddsqra.ddsqra_name = dsname;
ddsqra.ddsqra_source = source;
ddsqra.ddsqra_value = refquota;
return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check,
dsl_dataset_set_refquota_sync, &ddsqra, 0,
ZFS_SPACE_CHECK_EXTRA_RESERVED));
}
static int
dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx)
{
dsl_dataset_set_qr_arg_t *ddsqra = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *ds;
int error;
uint64_t newval, unique;
if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION)
return (SET_ERROR(ENOTSUP));
error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
if (error != 0)
return (error);
if (ds->ds_is_snapshot) {
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(EINVAL));
}
error = dsl_prop_predict(ds->ds_dir,
zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
if (error != 0) {
dsl_dataset_rele(ds, FTAG);
return (error);
}
/*
* If we are doing the preliminary check in open context, the
* space estimates may be inaccurate.
*/
if (!dmu_tx_is_syncing(tx)) {
dsl_dataset_rele(ds, FTAG);
return (0);
}
mutex_enter(&ds->ds_lock);
if (!DS_UNIQUE_IS_ACCURATE(ds))
dsl_dataset_recalc_head_uniq(ds);
unique = dsl_dataset_phys(ds)->ds_unique_bytes;
mutex_exit(&ds->ds_lock);
if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) {
uint64_t delta = MAX(unique, newval) -
MAX(unique, ds->ds_reserved);
if (delta >
dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) ||
(ds->ds_quota > 0 && newval > ds->ds_quota)) {
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(ENOSPC));
}
}
dsl_dataset_rele(ds, FTAG);
return (0);
}
void
dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
zprop_source_t source, uint64_t value, dmu_tx_t *tx)
{
uint64_t newval;
uint64_t unique;
int64_t delta;
dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
source, sizeof (value), 1, &value, tx);
VERIFY0(dsl_prop_get_int_ds(ds,
zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval));
dmu_buf_will_dirty(ds->ds_dbuf, tx);
mutex_enter(&ds->ds_dir->dd_lock);
mutex_enter(&ds->ds_lock);
ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
unique = dsl_dataset_phys(ds)->ds_unique_bytes;
delta = MAX(0, (int64_t)(newval - unique)) -
MAX(0, (int64_t)(ds->ds_reserved - unique));
ds->ds_reserved = newval;
mutex_exit(&ds->ds_lock);
dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx);
mutex_exit(&ds->ds_dir->dd_lock);
}
static void
dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx)
{
dsl_dataset_set_qr_arg_t *ddsqra = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *ds = NULL;
VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
dsl_dataset_set_refreservation_sync_impl(ds,
ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx);
dsl_dataset_rele(ds, FTAG);
}
int
dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
uint64_t refreservation)
{
dsl_dataset_set_qr_arg_t ddsqra;
ddsqra.ddsqra_name = dsname;
ddsqra.ddsqra_source = source;
ddsqra.ddsqra_value = refreservation;
return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check,
dsl_dataset_set_refreservation_sync, &ddsqra, 0,
ZFS_SPACE_CHECK_EXTRA_RESERVED));
}
typedef struct dsl_dataset_set_compression_arg {
const char *ddsca_name;
zprop_source_t ddsca_source;
uint64_t ddsca_value;
} dsl_dataset_set_compression_arg_t;
static int
dsl_dataset_set_compression_check(void *arg, dmu_tx_t *tx)
{
dsl_dataset_set_compression_arg_t *ddsca = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value);
spa_feature_t f = zio_compress_to_feature(compval);
if (f == SPA_FEATURE_NONE)
return (SET_ERROR(EINVAL));
if (!spa_feature_is_enabled(dp->dp_spa, f))
return (SET_ERROR(ENOTSUP));
return (0);
}
static void
dsl_dataset_set_compression_sync(void *arg, dmu_tx_t *tx)
{
dsl_dataset_set_compression_arg_t *ddsca = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *ds = NULL;
uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value);
spa_feature_t f = zio_compress_to_feature(compval);
ASSERT3S(f, !=, SPA_FEATURE_NONE);
ASSERT3S(spa_feature_table[f].fi_type, ==, ZFEATURE_TYPE_BOOLEAN);
VERIFY0(dsl_dataset_hold(dp, ddsca->ddsca_name, FTAG, &ds));
if (zfeature_active(f, ds->ds_feature[f]) != B_TRUE) {
ds->ds_feature_activation[f] = (void *)B_TRUE;
dsl_dataset_activate_feature(ds->ds_object, f,
ds->ds_feature_activation[f], tx);
ds->ds_feature[f] = ds->ds_feature_activation[f];
}
dsl_dataset_rele(ds, FTAG);
}
int
dsl_dataset_set_compression(const char *dsname, zprop_source_t source,
uint64_t compression)
{
dsl_dataset_set_compression_arg_t ddsca;
/*
* The sync task is only required for zstd in order to activate
* the feature flag when the property is first set.
*/
if (ZIO_COMPRESS_ALGO(compression) != ZIO_COMPRESS_ZSTD)
return (0);
ddsca.ddsca_name = dsname;
ddsca.ddsca_source = source;
ddsca.ddsca_value = compression;
return (dsl_sync_task(dsname, dsl_dataset_set_compression_check,
dsl_dataset_set_compression_sync, &ddsca, 0,
ZFS_SPACE_CHECK_EXTRA_RESERVED));
}
/*
* Return (in *usedp) the amount of space referenced by "new" that was not
* referenced at the time the bookmark corresponds to. "New" may be a
* snapshot or a head. The bookmark must be before new, in
* new's filesystem (or its origin) -- caller verifies this.
*
* The written space is calculated by considering two components: First, we
* ignore any freed space, and calculate the written as new's used space
* minus old's used space. Next, we add in the amount of space that was freed
* between the two time points, thus reducing new's used space relative to
* old's. Specifically, this is the space that was born before
* zbm_creation_txg, and freed before new (ie. on new's deadlist or a
* previous deadlist).
*
* space freed [---------------------]
* snapshots ---O-------O--------O-------O------
* bookmark new
*
* Note, the bookmark's zbm_*_bytes_refd must be valid, but if the HAS_FBN
* flag is not set, we will calculate the freed_before_next based on the
* next snapshot's deadlist, rather than using zbm_*_freed_before_next_snap.
*/
static int
dsl_dataset_space_written_impl(zfs_bookmark_phys_t *bmp,
dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
{
int err = 0;
dsl_pool_t *dp = new->ds_dir->dd_pool;
ASSERT(dsl_pool_config_held(dp));
if (dsl_dataset_is_snapshot(new)) {
ASSERT3U(bmp->zbm_creation_txg, <,
dsl_dataset_phys(new)->ds_creation_txg);
}
*usedp = 0;
*usedp += dsl_dataset_phys(new)->ds_referenced_bytes;
*usedp -= bmp->zbm_referenced_bytes_refd;
*compp = 0;
*compp += dsl_dataset_phys(new)->ds_compressed_bytes;
*compp -= bmp->zbm_compressed_bytes_refd;
*uncompp = 0;
*uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes;
*uncompp -= bmp->zbm_uncompressed_bytes_refd;
dsl_dataset_t *snap = new;
while (dsl_dataset_phys(snap)->ds_prev_snap_txg >
bmp->zbm_creation_txg) {
uint64_t used, comp, uncomp;
dsl_deadlist_space_range(&snap->ds_deadlist,
0, bmp->zbm_creation_txg,
&used, &comp, &uncomp);
*usedp += used;
*compp += comp;
*uncompp += uncomp;
uint64_t snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj;
if (snap != new)
dsl_dataset_rele(snap, FTAG);
err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap);
if (err != 0)
break;
}
/*
* We might not have the FBN if we are calculating written from
* a snapshot (because we didn't know the correct "next" snapshot
* until now).
*/
if (bmp->zbm_flags & ZBM_FLAG_HAS_FBN) {
*usedp += bmp->zbm_referenced_freed_before_next_snap;
*compp += bmp->zbm_compressed_freed_before_next_snap;
*uncompp += bmp->zbm_uncompressed_freed_before_next_snap;
} else {
ASSERT3U(dsl_dataset_phys(snap)->ds_prev_snap_txg, ==,
bmp->zbm_creation_txg);
uint64_t used, comp, uncomp;
dsl_deadlist_space(&snap->ds_deadlist, &used, &comp, &uncomp);
*usedp += used;
*compp += comp;
*uncompp += uncomp;
}
if (snap != new)
dsl_dataset_rele(snap, FTAG);
return (err);
}
/*
* Return (in *usedp) the amount of space written in new that was not
* present at the time the bookmark corresponds to. New may be a
* snapshot or the head. Old must be a bookmark before new, in
* new's filesystem (or its origin) -- caller verifies this.
*/
int
dsl_dataset_space_written_bookmark(zfs_bookmark_phys_t *bmp,
dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
{
if (!(bmp->zbm_flags & ZBM_FLAG_HAS_FBN))
return (SET_ERROR(ENOTSUP));
return (dsl_dataset_space_written_impl(bmp, new,
usedp, compp, uncompp));
}
/*
* Return (in *usedp) the amount of space written in new that is not
* present in oldsnap. New may be a snapshot or the head. Old must be
* a snapshot before new, in new's filesystem (or its origin). If not then
* fail and return EINVAL.
*/
int
dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
{
if (!dsl_dataset_is_before(new, oldsnap, 0))
return (SET_ERROR(EINVAL));
zfs_bookmark_phys_t zbm = { 0 };
dsl_dataset_phys_t *dsp = dsl_dataset_phys(oldsnap);
zbm.zbm_guid = dsp->ds_guid;
zbm.zbm_creation_txg = dsp->ds_creation_txg;
zbm.zbm_creation_time = dsp->ds_creation_time;
zbm.zbm_referenced_bytes_refd = dsp->ds_referenced_bytes;
zbm.zbm_compressed_bytes_refd = dsp->ds_compressed_bytes;
zbm.zbm_uncompressed_bytes_refd = dsp->ds_uncompressed_bytes;
/*
* If oldsnap is the origin (or origin's origin, ...) of new,
* we can't easily calculate the effective FBN. Therefore,
* we do not set ZBM_FLAG_HAS_FBN, so that the _impl will calculate
* it relative to the correct "next": the next snapshot towards "new",
* rather than the next snapshot in oldsnap's dsl_dir.
*/
return (dsl_dataset_space_written_impl(&zbm, new,
usedp, compp, uncompp));
}
/*
* Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
* lastsnap, and all snapshots in between are deleted.
*
* blocks that would be freed [---------------------------]
* snapshots ---O-------O--------O-------O--------O
* firstsnap lastsnap
*
* This is the set of blocks that were born after the snap before firstsnap,
* (birth > firstsnap->prev_snap_txg) and died before the snap after the
* last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
* We calculate this by iterating over the relevant deadlists (from the snap
* after lastsnap, backward to the snap after firstsnap), summing up the
* space on the deadlist that was born after the snap before firstsnap.
*/
int
dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap,
dsl_dataset_t *lastsnap,
uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
{
int err = 0;
uint64_t snapobj;
dsl_pool_t *dp = firstsnap->ds_dir->dd_pool;
ASSERT(firstsnap->ds_is_snapshot);
ASSERT(lastsnap->ds_is_snapshot);
/*
* Check that the snapshots are in the same dsl_dir, and firstsnap
* is before lastsnap.
*/
if (firstsnap->ds_dir != lastsnap->ds_dir ||
dsl_dataset_phys(firstsnap)->ds_creation_txg >
dsl_dataset_phys(lastsnap)->ds_creation_txg)
return (SET_ERROR(EINVAL));
*usedp = *compp = *uncompp = 0;
snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj;
while (snapobj != firstsnap->ds_object) {
dsl_dataset_t *ds;
uint64_t used, comp, uncomp;
err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds);
if (err != 0)
break;
dsl_deadlist_space_range(&ds->ds_deadlist,
dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX,
&used, &comp, &uncomp);
*usedp += used;
*compp += comp;
*uncompp += uncomp;
snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
ASSERT3U(snapobj, !=, 0);
dsl_dataset_rele(ds, FTAG);
}
return (err);
}
/*
* Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
* For example, they could both be snapshots of the same filesystem, and
* 'earlier' is before 'later'. Or 'earlier' could be the origin of
* 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
* filesystem. Or 'earlier' could be the origin's origin.
*
* If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
*/
boolean_t
dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier,
uint64_t earlier_txg)
{
dsl_pool_t *dp = later->ds_dir->dd_pool;
int error;
boolean_t ret;
ASSERT(dsl_pool_config_held(dp));
ASSERT(earlier->ds_is_snapshot || earlier_txg != 0);
if (earlier_txg == 0)
earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg;
if (later->ds_is_snapshot &&
earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg)
return (B_FALSE);
if (later->ds_dir == earlier->ds_dir)
return (B_TRUE);
/*
* We check dd_origin_obj explicitly here rather than using
* dsl_dir_is_clone() so that we will return TRUE if "earlier"
* is $ORIGIN@$ORIGIN. dsl_dataset_space_written() depends on
* this behavior.
*/
if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == 0)
return (B_FALSE);
dsl_dataset_t *origin;
error = dsl_dataset_hold_obj(dp,
dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin);
if (error != 0)
return (B_FALSE);
if (dsl_dataset_phys(origin)->ds_creation_txg == earlier_txg &&
origin->ds_dir == earlier->ds_dir) {
dsl_dataset_rele(origin, FTAG);
return (B_TRUE);
}
ret = dsl_dataset_is_before(origin, earlier, earlier_txg);
dsl_dataset_rele(origin, FTAG);
return (ret);
}
void
dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx)
{
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx);
}
boolean_t
dsl_dataset_is_zapified(dsl_dataset_t *ds)
{
dmu_object_info_t doi;
dmu_object_info_from_db(ds->ds_dbuf, &doi);
return (doi.doi_type == DMU_OTN_ZAP_METADATA);
}
boolean_t
dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds)
{
return (dsl_dataset_is_zapified(ds) &&
zap_contains(ds->ds_dir->dd_pool->dp_meta_objset,
ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0);
}
uint64_t
dsl_dataset_get_remap_deadlist_object(dsl_dataset_t *ds)
{
uint64_t remap_deadlist_obj;
int err;
if (!dsl_dataset_is_zapified(ds))
return (0);
err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object,
DS_FIELD_REMAP_DEADLIST, sizeof (remap_deadlist_obj), 1,
&remap_deadlist_obj);
if (err != 0) {
VERIFY3S(err, ==, ENOENT);
return (0);
}
ASSERT(remap_deadlist_obj != 0);
return (remap_deadlist_obj);
}
boolean_t
dsl_dataset_remap_deadlist_exists(dsl_dataset_t *ds)
{
EQUIV(dsl_deadlist_is_open(&ds->ds_remap_deadlist),
dsl_dataset_get_remap_deadlist_object(ds) != 0);
return (dsl_deadlist_is_open(&ds->ds_remap_deadlist));
}
static void
dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, uint64_t obj,
dmu_tx_t *tx)
{
ASSERT(obj != 0);
dsl_dataset_zapify(ds, tx);
VERIFY0(zap_add(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object,
DS_FIELD_REMAP_DEADLIST, sizeof (obj), 1, &obj, tx));
}
static void
dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, dmu_tx_t *tx)
{
VERIFY0(zap_remove(ds->ds_dir->dd_pool->dp_meta_objset,
ds->ds_object, DS_FIELD_REMAP_DEADLIST, tx));
}
void
dsl_dataset_destroy_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx)
{
uint64_t remap_deadlist_object;
spa_t *spa = ds->ds_dir->dd_pool->dp_spa;
ASSERT(dmu_tx_is_syncing(tx));
ASSERT(dsl_dataset_remap_deadlist_exists(ds));
remap_deadlist_object = ds->ds_remap_deadlist.dl_object;
dsl_deadlist_close(&ds->ds_remap_deadlist);
dsl_deadlist_free(spa_meta_objset(spa), remap_deadlist_object, tx);
dsl_dataset_unset_remap_deadlist_object(ds, tx);
spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
}
void
dsl_dataset_create_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx)
{
uint64_t remap_deadlist_obj;
spa_t *spa = ds->ds_dir->dd_pool->dp_spa;
ASSERT(dmu_tx_is_syncing(tx));
ASSERT(MUTEX_HELD(&ds->ds_remap_deadlist_lock));
/*
* Currently we only create remap deadlists when there are indirect
* vdevs with referenced mappings.
*/
ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL));
remap_deadlist_obj = dsl_deadlist_clone(
&ds->ds_deadlist, UINT64_MAX,
dsl_dataset_phys(ds)->ds_prev_snap_obj, tx);
dsl_dataset_set_remap_deadlist_object(ds,
remap_deadlist_obj, tx);
dsl_deadlist_open(&ds->ds_remap_deadlist, spa_meta_objset(spa),
remap_deadlist_obj);
spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
}
void
dsl_dataset_activate_redaction(dsl_dataset_t *ds, uint64_t *redact_snaps,
uint64_t num_redact_snaps, dmu_tx_t *tx)
{
uint64_t dsobj = ds->ds_object;
struct feature_type_uint64_array_arg *ftuaa =
kmem_zalloc(sizeof (*ftuaa), KM_SLEEP);
ftuaa->length = (int64_t)num_redact_snaps;
if (num_redact_snaps > 0) {
ftuaa->array = kmem_alloc(num_redact_snaps * sizeof (uint64_t),
KM_SLEEP);
memcpy(ftuaa->array, redact_snaps, num_redact_snaps *
sizeof (uint64_t));
}
dsl_dataset_activate_feature(dsobj, SPA_FEATURE_REDACTED_DATASETS,
ftuaa, tx);
ds->ds_feature[SPA_FEATURE_REDACTED_DATASETS] = ftuaa;
}
/*
* Find and return (in *oldest_dsobj) the oldest snapshot of the dsobj
* dataset whose birth time is >= min_txg.
*/
int
dsl_dataset_oldest_snapshot(spa_t *spa, uint64_t head_ds, uint64_t min_txg,
uint64_t *oldest_dsobj)
{
dsl_dataset_t *ds;
dsl_pool_t *dp = spa->spa_dsl_pool;
int error = dsl_dataset_hold_obj(dp, head_ds, FTAG, &ds);
if (error != 0)
return (error);
uint64_t prev_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
uint64_t prev_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
while (prev_obj != 0 && min_txg < prev_obj_txg) {
dsl_dataset_rele(ds, FTAG);
if ((error = dsl_dataset_hold_obj(dp, prev_obj,
FTAG, &ds)) != 0)
return (error);
prev_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
prev_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
}
*oldest_dsobj = ds->ds_object;
dsl_dataset_rele(ds, FTAG);
return (0);
}
ZFS_MODULE_PARAM(zfs, zfs_, max_recordsize, UINT, ZMOD_RW,
"Max allowed record size");
ZFS_MODULE_PARAM(zfs, zfs_, allow_redacted_dataset_mount, INT, ZMOD_RW,
"Allow mounting of redacted datasets");
ZFS_MODULE_PARAM(zfs, zfs_, snapshot_history_enabled, INT, ZMOD_RW,
"Include snapshot events in pool history/events");
EXPORT_SYMBOL(dsl_dataset_hold);
EXPORT_SYMBOL(dsl_dataset_hold_flags);
EXPORT_SYMBOL(dsl_dataset_hold_obj);
EXPORT_SYMBOL(dsl_dataset_hold_obj_flags);
EXPORT_SYMBOL(dsl_dataset_own);
EXPORT_SYMBOL(dsl_dataset_own_obj);
EXPORT_SYMBOL(dsl_dataset_name);
EXPORT_SYMBOL(dsl_dataset_rele);
EXPORT_SYMBOL(dsl_dataset_rele_flags);
EXPORT_SYMBOL(dsl_dataset_disown);
EXPORT_SYMBOL(dsl_dataset_tryown);
EXPORT_SYMBOL(dsl_dataset_create_sync);
EXPORT_SYMBOL(dsl_dataset_create_sync_dd);
EXPORT_SYMBOL(dsl_dataset_snapshot_check);
EXPORT_SYMBOL(dsl_dataset_snapshot_sync);
EXPORT_SYMBOL(dsl_dataset_promote);
EXPORT_SYMBOL(dsl_dataset_user_hold);
EXPORT_SYMBOL(dsl_dataset_user_release);
EXPORT_SYMBOL(dsl_dataset_get_holds);
EXPORT_SYMBOL(dsl_dataset_get_blkptr);
EXPORT_SYMBOL(dsl_dataset_get_spa);
EXPORT_SYMBOL(dsl_dataset_modified_since_snap);
EXPORT_SYMBOL(dsl_dataset_space_written);
EXPORT_SYMBOL(dsl_dataset_space_wouldfree);
EXPORT_SYMBOL(dsl_dataset_sync);
EXPORT_SYMBOL(dsl_dataset_block_born);
EXPORT_SYMBOL(dsl_dataset_block_kill);
EXPORT_SYMBOL(dsl_dataset_dirty);
EXPORT_SYMBOL(dsl_dataset_stats);
EXPORT_SYMBOL(dsl_dataset_fast_stat);
EXPORT_SYMBOL(dsl_dataset_space);
EXPORT_SYMBOL(dsl_dataset_fsid_guid);
EXPORT_SYMBOL(dsl_dsobj_to_dsname);
EXPORT_SYMBOL(dsl_dataset_check_quota);
EXPORT_SYMBOL(dsl_dataset_clone_swap_check_impl);
EXPORT_SYMBOL(dsl_dataset_clone_swap_sync_impl);
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