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zfs-builds-mm/zfs-2.0.0-rc4/module/zfs/dsl_bookmark.c

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add_zfs_2.0.0-rc4
2020-10-22 14:20:35 +02:00
/*
* CDDL HEADER START
*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2013, 2018 by Delphix. All rights reserved.
* Copyright 2017 Nexenta Systems, Inc.
* Copyright 2019, 2020 by Christian Schwarz. All rights reserved.
*/
#include <sys/zfs_context.h>
#include <sys/dsl_dataset.h>
#include <sys/dsl_dir.h>
#include <sys/dsl_prop.h>
#include <sys/dsl_synctask.h>
#include <sys/dsl_destroy.h>
#include <sys/dmu_impl.h>
#include <sys/dmu_tx.h>
#include <sys/arc.h>
#include <sys/zap.h>
#include <sys/zfeature.h>
#include <sys/spa.h>
#include <sys/dsl_bookmark.h>
#include <zfs_namecheck.h>
#include <sys/dmu_send.h>
static int
dsl_bookmark_hold_ds(dsl_pool_t *dp, const char *fullname,
dsl_dataset_t **dsp, void *tag, char **shortnamep)
{
char buf[ZFS_MAX_DATASET_NAME_LEN];
char *hashp;
if (strlen(fullname) >= ZFS_MAX_DATASET_NAME_LEN)
return (SET_ERROR(ENAMETOOLONG));
hashp = strchr(fullname, '#');
if (hashp == NULL)
return (SET_ERROR(EINVAL));
*shortnamep = hashp + 1;
if (zfs_component_namecheck(*shortnamep, NULL, NULL))
return (SET_ERROR(EINVAL));
(void) strlcpy(buf, fullname, hashp - fullname + 1);
return (dsl_dataset_hold(dp, buf, tag, dsp));
}
/*
* When reading BOOKMARK_V1 bookmarks, the BOOKMARK_V2 fields are guaranteed
* to be zeroed.
*
* Returns ESRCH if bookmark is not found.
* Note, we need to use the ZAP rather than the AVL to look up bookmarks
* by name, because only the ZAP honors the casesensitivity setting.
*/
int
dsl_bookmark_lookup_impl(dsl_dataset_t *ds, const char *shortname,
zfs_bookmark_phys_t *bmark_phys)
{
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
uint64_t bmark_zapobj = ds->ds_bookmarks_obj;
matchtype_t mt = 0;
int err;
if (bmark_zapobj == 0)
return (SET_ERROR(ESRCH));
if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
mt = MT_NORMALIZE;
/*
* Zero out the bookmark in case the one stored on disk
* is in an older, shorter format.
*/
bzero(bmark_phys, sizeof (*bmark_phys));
err = zap_lookup_norm(mos, bmark_zapobj, shortname, sizeof (uint64_t),
sizeof (*bmark_phys) / sizeof (uint64_t), bmark_phys, mt, NULL, 0,
NULL);
return (err == ENOENT ? SET_ERROR(ESRCH) : err);
}
/*
* If later_ds is non-NULL, this will return EXDEV if the specified bookmark
* does not represents an earlier point in later_ds's timeline. However,
* bmp will still be filled in if we return EXDEV.
*
* Returns ENOENT if the dataset containing the bookmark does not exist.
* Returns ESRCH if the dataset exists but the bookmark was not found in it.
*/
int
dsl_bookmark_lookup(dsl_pool_t *dp, const char *fullname,
dsl_dataset_t *later_ds, zfs_bookmark_phys_t *bmp)
{
char *shortname;
dsl_dataset_t *ds;
int error;
error = dsl_bookmark_hold_ds(dp, fullname, &ds, FTAG, &shortname);
if (error != 0)
return (error);
error = dsl_bookmark_lookup_impl(ds, shortname, bmp);
if (error == 0 && later_ds != NULL) {
if (!dsl_dataset_is_before(later_ds, ds, bmp->zbm_creation_txg))
error = SET_ERROR(EXDEV);
}
dsl_dataset_rele(ds, FTAG);
return (error);
}
/*
* Validates that
* - bmark is a full dataset path of a bookmark (bookmark_namecheck)
* - source is a full path of a snapshot or bookmark
* ({bookmark,snapshot}_namecheck)
*
* Returns 0 if valid, -1 otherwise.
*/
static int
dsl_bookmark_create_nvl_validate_pair(const char *bmark, const char *source)
{
if (bookmark_namecheck(bmark, NULL, NULL) != 0)
return (-1);
int is_bmark, is_snap;
is_bmark = bookmark_namecheck(source, NULL, NULL) == 0;
is_snap = snapshot_namecheck(source, NULL, NULL) == 0;
if (!is_bmark && !is_snap)
return (-1);
return (0);
}
/*
* Check that the given nvlist corresponds to the following schema:
* { newbookmark -> source, ... }
* where
* - each pair passes dsl_bookmark_create_nvl_validate_pair
* - all newbookmarks are in the same pool
* - all newbookmarks have unique names
*
* Note that this function is only validates above schema. Callers must ensure
* that the bookmarks can be created, e.g. that sources exist.
*
* Returns 0 if the nvlist adheres to above schema.
* Returns -1 if it doesn't.
*/
int
dsl_bookmark_create_nvl_validate(nvlist_t *bmarks)
{
char *first;
size_t first_len;
first = NULL;
for (nvpair_t *pair = nvlist_next_nvpair(bmarks, NULL);
pair != NULL; pair = nvlist_next_nvpair(bmarks, pair)) {
char *bmark = nvpair_name(pair);
char *source;
/* list structure: values must be snapshots XOR bookmarks */
if (nvpair_value_string(pair, &source) != 0)
return (-1);
if (dsl_bookmark_create_nvl_validate_pair(bmark, source) != 0)
return (-1);
/* same pool check */
if (first == NULL) {
char *cp = strpbrk(bmark, "/#");
if (cp == NULL)
return (-1);
first = bmark;
first_len = cp - bmark;
}
if (strncmp(first, bmark, first_len) != 0)
return (-1);
switch (*(bmark + first_len)) {
case '/': /* fallthrough */
case '#':
break;
default:
return (-1);
}
/* unique newbookmark names; todo: O(n^2) */
for (nvpair_t *pair2 = nvlist_next_nvpair(bmarks, pair);
pair2 != NULL; pair2 = nvlist_next_nvpair(bmarks, pair2)) {
if (strcmp(nvpair_name(pair), nvpair_name(pair2)) == 0)
return (-1);
}
}
return (0);
}
/*
* expects that newbm and source have been validated using
* dsl_bookmark_create_nvl_validate_pair
*/
static int
dsl_bookmark_create_check_impl(dsl_pool_t *dp,
const char *newbm, const char *source)
{
ASSERT0(dsl_bookmark_create_nvl_validate_pair(newbm, source));
/* defer source namecheck until we know it's a snapshot or bookmark */
int error;
dsl_dataset_t *newbm_ds;
char *newbm_short;
zfs_bookmark_phys_t bmark_phys;
error = dsl_bookmark_hold_ds(dp, newbm, &newbm_ds, FTAG, &newbm_short);
if (error != 0)
return (error);
/* Verify that the new bookmark does not already exist */
error = dsl_bookmark_lookup_impl(newbm_ds, newbm_short, &bmark_phys);
switch (error) {
case ESRCH:
/* happy path: new bmark doesn't exist, proceed after switch */
error = 0;
break;
case 0:
error = SET_ERROR(EEXIST);
goto eholdnewbmds;
default:
/* dsl_bookmark_lookup_impl already did SET_ERRROR */
goto eholdnewbmds;
}
/* error is retval of the following if-cascade */
if (strchr(source, '@') != NULL) {
dsl_dataset_t *source_snap_ds;
ASSERT3S(snapshot_namecheck(source, NULL, NULL), ==, 0);
error = dsl_dataset_hold(dp, source, FTAG, &source_snap_ds);
if (error == 0) {
VERIFY(source_snap_ds->ds_is_snapshot);
/*
* Verify that source snapshot is an earlier point in
* newbm_ds's timeline (source may be newbm_ds's origin)
*/
if (!dsl_dataset_is_before(newbm_ds, source_snap_ds, 0))
error = SET_ERROR(
ZFS_ERR_BOOKMARK_SOURCE_NOT_ANCESTOR);
dsl_dataset_rele(source_snap_ds, FTAG);
}
} else if (strchr(source, '#') != NULL) {
zfs_bookmark_phys_t source_phys;
ASSERT3S(bookmark_namecheck(source, NULL, NULL), ==, 0);
/*
* Source must exists and be an earlier point in newbm_ds's
* timeline (newbm_ds's origin may be a snap of source's ds)
*/
error = dsl_bookmark_lookup(dp, source, newbm_ds, &source_phys);
switch (error) {
case 0:
break; /* happy path */
case EXDEV:
error = SET_ERROR(ZFS_ERR_BOOKMARK_SOURCE_NOT_ANCESTOR);
break;
default:
/* dsl_bookmark_lookup already did SET_ERRROR */
break;
}
} else {
/*
* dsl_bookmark_create_nvl_validate validates that source is
* either snapshot or bookmark
*/
panic("unreachable code: %s", source);
}
eholdnewbmds:
dsl_dataset_rele(newbm_ds, FTAG);
return (error);
}
int
dsl_bookmark_create_check(void *arg, dmu_tx_t *tx)
{
dsl_bookmark_create_arg_t *dbca = arg;
int rv = 0;
int schema_err = 0;
ASSERT3P(dbca, !=, NULL);
ASSERT3P(dbca->dbca_bmarks, !=, NULL);
/* dbca->dbca_errors is allowed to be NULL */
dsl_pool_t *dp = dmu_tx_pool(tx);
if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARKS))
return (SET_ERROR(ENOTSUP));
if (dsl_bookmark_create_nvl_validate(dbca->dbca_bmarks) != 0)
rv = schema_err = SET_ERROR(EINVAL);
for (nvpair_t *pair = nvlist_next_nvpair(dbca->dbca_bmarks, NULL);
pair != NULL; pair = nvlist_next_nvpair(dbca->dbca_bmarks, pair)) {
char *new = nvpair_name(pair);
int error = schema_err;
if (error == 0) {
char *source = fnvpair_value_string(pair);
error = dsl_bookmark_create_check_impl(dp, new, source);
if (error != 0)
error = SET_ERROR(error);
}
if (error != 0) {
rv = error;
if (dbca->dbca_errors != NULL)
fnvlist_add_int32(dbca->dbca_errors,
new, error);
}
}
return (rv);
}
static dsl_bookmark_node_t *
dsl_bookmark_node_alloc(char *shortname)
{
dsl_bookmark_node_t *dbn = kmem_alloc(sizeof (*dbn), KM_SLEEP);
dbn->dbn_name = spa_strdup(shortname);
dbn->dbn_dirty = B_FALSE;
mutex_init(&dbn->dbn_lock, NULL, MUTEX_DEFAULT, NULL);
return (dbn);
}
/*
* Set the fields in the zfs_bookmark_phys_t based on the specified snapshot.
*/
static void
dsl_bookmark_set_phys(zfs_bookmark_phys_t *zbm, dsl_dataset_t *snap)
{
spa_t *spa = dsl_dataset_get_spa(snap);
objset_t *mos = spa_get_dsl(spa)->dp_meta_objset;
dsl_dataset_phys_t *dsp = dsl_dataset_phys(snap);
zbm->zbm_guid = dsp->ds_guid;
zbm->zbm_creation_txg = dsp->ds_creation_txg;
zbm->zbm_creation_time = dsp->ds_creation_time;
zbm->zbm_redaction_obj = 0;
/*
* If the dataset is encrypted create a larger bookmark to
* accommodate the IVset guid. The IVset guid was added
* after the encryption feature to prevent a problem with
* raw sends. If we encounter an encrypted dataset without
* an IVset guid we fall back to a normal bookmark.
*/
if (snap->ds_dir->dd_crypto_obj != 0 &&
spa_feature_is_enabled(spa, SPA_FEATURE_BOOKMARK_V2)) {
(void) zap_lookup(mos, snap->ds_object,
DS_FIELD_IVSET_GUID, sizeof (uint64_t), 1,
&zbm->zbm_ivset_guid);
}
if (spa_feature_is_enabled(spa, SPA_FEATURE_BOOKMARK_WRITTEN)) {
zbm->zbm_flags = ZBM_FLAG_SNAPSHOT_EXISTS | ZBM_FLAG_HAS_FBN;
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;
dsl_dataset_t *nextds;
VERIFY0(dsl_dataset_hold_obj(snap->ds_dir->dd_pool,
dsp->ds_next_snap_obj, FTAG, &nextds));
dsl_deadlist_space(&nextds->ds_deadlist,
&zbm->zbm_referenced_freed_before_next_snap,
&zbm->zbm_compressed_freed_before_next_snap,
&zbm->zbm_uncompressed_freed_before_next_snap);
dsl_dataset_rele(nextds, FTAG);
} else {
bzero(&zbm->zbm_flags,
sizeof (zfs_bookmark_phys_t) -
offsetof(zfs_bookmark_phys_t, zbm_flags));
}
}
/*
* Add dsl_bookmark_node_t `dbn` to the given dataset and increment appropriate
* SPA feature counters.
*/
void
dsl_bookmark_node_add(dsl_dataset_t *hds, dsl_bookmark_node_t *dbn,
dmu_tx_t *tx)
{
dsl_pool_t *dp = dmu_tx_pool(tx);
objset_t *mos = dp->dp_meta_objset;
if (hds->ds_bookmarks_obj == 0) {
hds->ds_bookmarks_obj = zap_create_norm(mos,
U8_TEXTPREP_TOUPPER, DMU_OTN_ZAP_METADATA, DMU_OT_NONE, 0,
tx);
spa_feature_incr(dp->dp_spa, SPA_FEATURE_BOOKMARKS, tx);
dsl_dataset_zapify(hds, tx);
VERIFY0(zap_add(mos, hds->ds_object,
DS_FIELD_BOOKMARK_NAMES,
sizeof (hds->ds_bookmarks_obj), 1,
&hds->ds_bookmarks_obj, tx));
}
avl_add(&hds->ds_bookmarks, dbn);
/*
* To maintain backwards compatibility with software that doesn't
* understand SPA_FEATURE_BOOKMARK_V2, we need to use the smallest
* possible bookmark size.
*/
uint64_t bookmark_phys_size = BOOKMARK_PHYS_SIZE_V1;
if (spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARK_V2) &&
(dbn->dbn_phys.zbm_ivset_guid != 0 || dbn->dbn_phys.zbm_flags &
ZBM_FLAG_HAS_FBN || dbn->dbn_phys.zbm_redaction_obj != 0)) {
bookmark_phys_size = BOOKMARK_PHYS_SIZE_V2;
spa_feature_incr(dp->dp_spa, SPA_FEATURE_BOOKMARK_V2, tx);
}
__attribute__((unused)) zfs_bookmark_phys_t zero_phys = { 0 };
ASSERT0(bcmp(((char *)&dbn->dbn_phys) + bookmark_phys_size,
&zero_phys, sizeof (zfs_bookmark_phys_t) - bookmark_phys_size));
VERIFY0(zap_add(mos, hds->ds_bookmarks_obj, dbn->dbn_name,
sizeof (uint64_t), bookmark_phys_size / sizeof (uint64_t),
&dbn->dbn_phys, tx));
}
/*
* If redaction_list is non-null, we create a redacted bookmark and redaction
* list, and store the object number of the redaction list in redact_obj.
*/
static void
dsl_bookmark_create_sync_impl_snap(const char *bookmark, const char *snapshot,
dmu_tx_t *tx, uint64_t num_redact_snaps, uint64_t *redact_snaps, void *tag,
redaction_list_t **redaction_list)
{
dsl_pool_t *dp = dmu_tx_pool(tx);
objset_t *mos = dp->dp_meta_objset;
dsl_dataset_t *snapds, *bmark_fs;
char *shortname;
boolean_t bookmark_redacted;
uint64_t *dsredactsnaps;
uint64_t dsnumsnaps;
VERIFY0(dsl_dataset_hold(dp, snapshot, FTAG, &snapds));
VERIFY0(dsl_bookmark_hold_ds(dp, bookmark, &bmark_fs, FTAG,
&shortname));
dsl_bookmark_node_t *dbn = dsl_bookmark_node_alloc(shortname);
dsl_bookmark_set_phys(&dbn->dbn_phys, snapds);
bookmark_redacted = dsl_dataset_get_uint64_array_feature(snapds,
SPA_FEATURE_REDACTED_DATASETS, &dsnumsnaps, &dsredactsnaps);
if (redaction_list != NULL || bookmark_redacted) {
redaction_list_t *local_rl;
if (bookmark_redacted) {
redact_snaps = dsredactsnaps;
num_redact_snaps = dsnumsnaps;
}
dbn->dbn_phys.zbm_redaction_obj = dmu_object_alloc(mos,
DMU_OTN_UINT64_METADATA, SPA_OLD_MAXBLOCKSIZE,
DMU_OTN_UINT64_METADATA, sizeof (redaction_list_phys_t) +
num_redact_snaps * sizeof (uint64_t), tx);
spa_feature_incr(dp->dp_spa,
SPA_FEATURE_REDACTION_BOOKMARKS, tx);
VERIFY0(dsl_redaction_list_hold_obj(dp,
dbn->dbn_phys.zbm_redaction_obj, tag, &local_rl));
dsl_redaction_list_long_hold(dp, local_rl, tag);
ASSERT3U((local_rl)->rl_dbuf->db_size, >=,
sizeof (redaction_list_phys_t) + num_redact_snaps *
sizeof (uint64_t));
dmu_buf_will_dirty(local_rl->rl_dbuf, tx);
bcopy(redact_snaps, local_rl->rl_phys->rlp_snaps,
sizeof (uint64_t) * num_redact_snaps);
local_rl->rl_phys->rlp_num_snaps = num_redact_snaps;
if (bookmark_redacted) {
ASSERT3P(redaction_list, ==, NULL);
local_rl->rl_phys->rlp_last_blkid = UINT64_MAX;
local_rl->rl_phys->rlp_last_object = UINT64_MAX;
dsl_redaction_list_long_rele(local_rl, tag);
dsl_redaction_list_rele(local_rl, tag);
} else {
*redaction_list = local_rl;
}
}
if (dbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN) {
spa_feature_incr(dp->dp_spa,
SPA_FEATURE_BOOKMARK_WRITTEN, tx);
}
dsl_bookmark_node_add(bmark_fs, dbn, tx);
spa_history_log_internal_ds(bmark_fs, "bookmark", tx,
"name=%s creation_txg=%llu target_snap=%llu redact_obj=%llu",
shortname, (longlong_t)dbn->dbn_phys.zbm_creation_txg,
(longlong_t)snapds->ds_object,
(longlong_t)dbn->dbn_phys.zbm_redaction_obj);
dsl_dataset_rele(bmark_fs, FTAG);
dsl_dataset_rele(snapds, FTAG);
}
static void
dsl_bookmark_create_sync_impl_book(
const char *new_name, const char *source_name, dmu_tx_t *tx)
{
dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *bmark_fs_source, *bmark_fs_new;
char *source_shortname, *new_shortname;
zfs_bookmark_phys_t source_phys;
VERIFY0(dsl_bookmark_hold_ds(dp, source_name, &bmark_fs_source, FTAG,
&source_shortname));
VERIFY0(dsl_bookmark_hold_ds(dp, new_name, &bmark_fs_new, FTAG,
&new_shortname));
/*
* create a copy of the source bookmark by copying most of its members
*
* Caveat: bookmarking a redaction bookmark yields a normal bookmark
* -----------------------------------------------------------------
* Reasoning:
* - The zbm_redaction_obj would be referred to by both source and new
* bookmark, but would be destroyed once either source or new is
* destroyed, resulting in use-after-free of the referrred object.
* - User expectation when issuing the `zfs bookmark` command is that
* a normal bookmark of the source is created
*
* Design Alternatives For Full Redaction Bookmark Copying:
* - reference-count the redaction object => would require on-disk
* format change for existing redaction objects
* - Copy the redaction object => cannot be done in syncing context
* because the redaction object might be too large
*/
VERIFY0(dsl_bookmark_lookup_impl(bmark_fs_source, source_shortname,
&source_phys));
dsl_bookmark_node_t *new_dbn = dsl_bookmark_node_alloc(new_shortname);
memcpy(&new_dbn->dbn_phys, &source_phys, sizeof (source_phys));
new_dbn->dbn_phys.zbm_redaction_obj = 0;
/* update feature counters */
if (new_dbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN) {
spa_feature_incr(dp->dp_spa,
SPA_FEATURE_BOOKMARK_WRITTEN, tx);
}
/* no need for redaction bookmark counter; nulled zbm_redaction_obj */
/* dsl_bookmark_node_add bumps bookmarks and v2-bookmarks counter */
/*
* write new bookmark
*
* Note that dsl_bookmark_lookup_impl guarantees that, if source is a
* v1 bookmark, the v2-only fields are zeroed.
* And dsl_bookmark_node_add writes back a v1-sized bookmark if
* v2 bookmarks are disabled and/or v2-only fields are zeroed.
* => bookmark copying works on pre-bookmark-v2 pools
*/
dsl_bookmark_node_add(bmark_fs_new, new_dbn, tx);
spa_history_log_internal_ds(bmark_fs_source, "bookmark", tx,
"name=%s creation_txg=%llu source_guid=%llu",
new_shortname, (longlong_t)new_dbn->dbn_phys.zbm_creation_txg,
(longlong_t)source_phys.zbm_guid);
dsl_dataset_rele(bmark_fs_source, FTAG);
dsl_dataset_rele(bmark_fs_new, FTAG);
}
void
dsl_bookmark_create_sync(void *arg, dmu_tx_t *tx)
{
dsl_bookmark_create_arg_t *dbca = arg;
ASSERT(spa_feature_is_enabled(dmu_tx_pool(tx)->dp_spa,
SPA_FEATURE_BOOKMARKS));
for (nvpair_t *pair = nvlist_next_nvpair(dbca->dbca_bmarks, NULL);
pair != NULL; pair = nvlist_next_nvpair(dbca->dbca_bmarks, pair)) {
char *new = nvpair_name(pair);
char *source = fnvpair_value_string(pair);
if (strchr(source, '@') != NULL) {
dsl_bookmark_create_sync_impl_snap(new, source, tx,
0, NULL, NULL, NULL);
} else if (strchr(source, '#') != NULL) {
dsl_bookmark_create_sync_impl_book(new, source, tx);
} else {
panic("unreachable code");
}
}
}
/*
* The bookmarks must all be in the same pool.
*/
int
dsl_bookmark_create(nvlist_t *bmarks, nvlist_t *errors)
{
nvpair_t *pair;
dsl_bookmark_create_arg_t dbca;
pair = nvlist_next_nvpair(bmarks, NULL);
if (pair == NULL)
return (0);
dbca.dbca_bmarks = bmarks;
dbca.dbca_errors = errors;
return (dsl_sync_task(nvpair_name(pair), dsl_bookmark_create_check,
dsl_bookmark_create_sync, &dbca,
fnvlist_num_pairs(bmarks), ZFS_SPACE_CHECK_NORMAL));
}
static int
dsl_bookmark_create_redacted_check(void *arg, dmu_tx_t *tx)
{
dsl_bookmark_create_redacted_arg_t *dbcra = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
int rv = 0;
if (!spa_feature_is_enabled(dp->dp_spa,
SPA_FEATURE_REDACTION_BOOKMARKS))
return (SET_ERROR(ENOTSUP));
/*
* If the list of redact snaps will not fit in the bonus buffer with
* the furthest reached object and offset, fail.
*/
if (dbcra->dbcra_numsnaps > (dmu_bonus_max() -
sizeof (redaction_list_phys_t)) / sizeof (uint64_t))
return (SET_ERROR(E2BIG));
if (dsl_bookmark_create_nvl_validate_pair(
dbcra->dbcra_bmark, dbcra->dbcra_snap) != 0)
return (SET_ERROR(EINVAL));
rv = dsl_bookmark_create_check_impl(dp,
dbcra->dbcra_bmark, dbcra->dbcra_snap);
return (rv);
}
static void
dsl_bookmark_create_redacted_sync(void *arg, dmu_tx_t *tx)
{
dsl_bookmark_create_redacted_arg_t *dbcra = arg;
dsl_bookmark_create_sync_impl_snap(dbcra->dbcra_bmark,
dbcra->dbcra_snap, tx, dbcra->dbcra_numsnaps, dbcra->dbcra_snaps,
dbcra->dbcra_tag, dbcra->dbcra_rl);
}
int
dsl_bookmark_create_redacted(const char *bookmark, const char *snapshot,
uint64_t numsnaps, uint64_t *snapguids, void *tag, redaction_list_t **rl)
{
dsl_bookmark_create_redacted_arg_t dbcra;
dbcra.dbcra_bmark = bookmark;
dbcra.dbcra_snap = snapshot;
dbcra.dbcra_rl = rl;
dbcra.dbcra_numsnaps = numsnaps;
dbcra.dbcra_snaps = snapguids;
dbcra.dbcra_tag = tag;
return (dsl_sync_task(bookmark, dsl_bookmark_create_redacted_check,
dsl_bookmark_create_redacted_sync, &dbcra, 5,
ZFS_SPACE_CHECK_NORMAL));
}
/*
* Retrieve the list of properties given in the 'props' nvlist for a bookmark.
* If 'props' is NULL, retrieves all properties.
*/
static void
dsl_bookmark_fetch_props(dsl_pool_t *dp, zfs_bookmark_phys_t *bmark_phys,
nvlist_t *props, nvlist_t *out_props)
{
ASSERT3P(dp, !=, NULL);
ASSERT3P(bmark_phys, !=, NULL);
ASSERT3P(out_props, !=, NULL);
ASSERT(RRW_LOCK_HELD(&dp->dp_config_rwlock));
if (props == NULL || nvlist_exists(props,
zfs_prop_to_name(ZFS_PROP_GUID))) {
dsl_prop_nvlist_add_uint64(out_props,
ZFS_PROP_GUID, bmark_phys->zbm_guid);
}
if (props == NULL || nvlist_exists(props,
zfs_prop_to_name(ZFS_PROP_CREATETXG))) {
dsl_prop_nvlist_add_uint64(out_props,
ZFS_PROP_CREATETXG, bmark_phys->zbm_creation_txg);
}
if (props == NULL || nvlist_exists(props,
zfs_prop_to_name(ZFS_PROP_CREATION))) {
dsl_prop_nvlist_add_uint64(out_props,
ZFS_PROP_CREATION, bmark_phys->zbm_creation_time);
}
if (props == NULL || nvlist_exists(props,
zfs_prop_to_name(ZFS_PROP_IVSET_GUID))) {
dsl_prop_nvlist_add_uint64(out_props,
ZFS_PROP_IVSET_GUID, bmark_phys->zbm_ivset_guid);
}
if (bmark_phys->zbm_flags & ZBM_FLAG_HAS_FBN) {
if (props == NULL || nvlist_exists(props,
zfs_prop_to_name(ZFS_PROP_REFERENCED))) {
dsl_prop_nvlist_add_uint64(out_props,
ZFS_PROP_REFERENCED,
bmark_phys->zbm_referenced_bytes_refd);
}
if (props == NULL || nvlist_exists(props,
zfs_prop_to_name(ZFS_PROP_LOGICALREFERENCED))) {
dsl_prop_nvlist_add_uint64(out_props,
ZFS_PROP_LOGICALREFERENCED,
bmark_phys->zbm_uncompressed_bytes_refd);
}
if (props == NULL || nvlist_exists(props,
zfs_prop_to_name(ZFS_PROP_REFRATIO))) {
uint64_t ratio =
bmark_phys->zbm_compressed_bytes_refd == 0 ? 100 :
bmark_phys->zbm_uncompressed_bytes_refd * 100 /
bmark_phys->zbm_compressed_bytes_refd;
dsl_prop_nvlist_add_uint64(out_props,
ZFS_PROP_REFRATIO, ratio);
}
}
if ((props == NULL || nvlist_exists(props, "redact_snaps") ||
nvlist_exists(props, "redact_complete")) &&
bmark_phys->zbm_redaction_obj != 0) {
redaction_list_t *rl;
int err = dsl_redaction_list_hold_obj(dp,
bmark_phys->zbm_redaction_obj, FTAG, &rl);
if (err == 0) {
if (nvlist_exists(props, "redact_snaps")) {
nvlist_t *nvl;
nvl = fnvlist_alloc();
fnvlist_add_uint64_array(nvl, ZPROP_VALUE,
rl->rl_phys->rlp_snaps,
rl->rl_phys->rlp_num_snaps);
fnvlist_add_nvlist(out_props, "redact_snaps",
nvl);
nvlist_free(nvl);
}
if (nvlist_exists(props, "redact_complete")) {
nvlist_t *nvl;
nvl = fnvlist_alloc();
fnvlist_add_boolean_value(nvl, ZPROP_VALUE,
rl->rl_phys->rlp_last_blkid == UINT64_MAX &&
rl->rl_phys->rlp_last_object == UINT64_MAX);
fnvlist_add_nvlist(out_props, "redact_complete",
nvl);
nvlist_free(nvl);
}
dsl_redaction_list_rele(rl, FTAG);
}
}
}
int
dsl_get_bookmarks_impl(dsl_dataset_t *ds, nvlist_t *props, nvlist_t *outnvl)
{
dsl_pool_t *dp = ds->ds_dir->dd_pool;
ASSERT(dsl_pool_config_held(dp));
if (dsl_dataset_is_snapshot(ds))
return (SET_ERROR(EINVAL));
for (dsl_bookmark_node_t *dbn = avl_first(&ds->ds_bookmarks);
dbn != NULL; dbn = AVL_NEXT(&ds->ds_bookmarks, dbn)) {
nvlist_t *out_props = fnvlist_alloc();
dsl_bookmark_fetch_props(dp, &dbn->dbn_phys, props, out_props);
fnvlist_add_nvlist(outnvl, dbn->dbn_name, out_props);
fnvlist_free(out_props);
}
return (0);
}
/*
* Comparison func for ds_bookmarks AVL tree. We sort the bookmarks by
* their TXG, then by their FBN-ness. The "FBN-ness" component ensures
* that all bookmarks at the same TXG that HAS_FBN are adjacent, which
* dsl_bookmark_destroy_sync_impl() depends on. Note that there may be
* multiple bookmarks at the same TXG (with the same FBN-ness). In this
* case we differentiate them by an arbitrary metric (in this case,
* their names).
*/
static int
dsl_bookmark_compare(const void *l, const void *r)
{
const dsl_bookmark_node_t *ldbn = l;
const dsl_bookmark_node_t *rdbn = r;
int64_t cmp = TREE_CMP(ldbn->dbn_phys.zbm_creation_txg,
rdbn->dbn_phys.zbm_creation_txg);
if (likely(cmp))
return (cmp);
cmp = TREE_CMP((ldbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN),
(rdbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN));
if (likely(cmp))
return (cmp);
cmp = strcmp(ldbn->dbn_name, rdbn->dbn_name);
return (TREE_ISIGN(cmp));
}
/*
* Cache this (head) dataset's bookmarks in the ds_bookmarks AVL tree.
*/
int
dsl_bookmark_init_ds(dsl_dataset_t *ds)
{
dsl_pool_t *dp = ds->ds_dir->dd_pool;
objset_t *mos = dp->dp_meta_objset;
ASSERT(!ds->ds_is_snapshot);
avl_create(&ds->ds_bookmarks, dsl_bookmark_compare,
sizeof (dsl_bookmark_node_t),
offsetof(dsl_bookmark_node_t, dbn_node));
if (!dsl_dataset_is_zapified(ds))
return (0);
int zaperr = zap_lookup(mos, ds->ds_object, DS_FIELD_BOOKMARK_NAMES,
sizeof (ds->ds_bookmarks_obj), 1, &ds->ds_bookmarks_obj);
if (zaperr == ENOENT)
return (0);
if (zaperr != 0)
return (zaperr);
if (ds->ds_bookmarks_obj == 0)
return (0);
int err = 0;
zap_cursor_t zc;
zap_attribute_t attr;
for (zap_cursor_init(&zc, mos, ds->ds_bookmarks_obj);
(err = zap_cursor_retrieve(&zc, &attr)) == 0;
zap_cursor_advance(&zc)) {
dsl_bookmark_node_t *dbn =
dsl_bookmark_node_alloc(attr.za_name);
err = dsl_bookmark_lookup_impl(ds,
dbn->dbn_name, &dbn->dbn_phys);
ASSERT3U(err, !=, ENOENT);
if (err != 0) {
kmem_free(dbn, sizeof (*dbn));
break;
}
avl_add(&ds->ds_bookmarks, dbn);
}
zap_cursor_fini(&zc);
if (err == ENOENT)
err = 0;
return (err);
}
void
dsl_bookmark_fini_ds(dsl_dataset_t *ds)
{
void *cookie = NULL;
dsl_bookmark_node_t *dbn;
if (ds->ds_is_snapshot)
return;
while ((dbn = avl_destroy_nodes(&ds->ds_bookmarks, &cookie)) != NULL) {
spa_strfree(dbn->dbn_name);
mutex_destroy(&dbn->dbn_lock);
kmem_free(dbn, sizeof (*dbn));
}
avl_destroy(&ds->ds_bookmarks);
}
/*
* Retrieve the bookmarks that exist in the specified dataset, and the
* requested properties of each bookmark.
*
* The "props" nvlist specifies which properties are requested.
* See lzc_get_bookmarks() for the list of valid properties.
*/
int
dsl_get_bookmarks(const char *dsname, nvlist_t *props, nvlist_t *outnvl)
{
dsl_pool_t *dp;
dsl_dataset_t *ds;
int err;
err = dsl_pool_hold(dsname, FTAG, &dp);
if (err != 0)
return (err);
err = dsl_dataset_hold(dp, dsname, FTAG, &ds);
if (err != 0) {
dsl_pool_rele(dp, FTAG);
return (err);
}
err = dsl_get_bookmarks_impl(ds, props, outnvl);
dsl_dataset_rele(ds, FTAG);
dsl_pool_rele(dp, FTAG);
return (err);
}
/*
* Retrieve all properties for a single bookmark in the given dataset.
*/
int
dsl_get_bookmark_props(const char *dsname, const char *bmname, nvlist_t *props)
{
dsl_pool_t *dp;
dsl_dataset_t *ds;
zfs_bookmark_phys_t bmark_phys = { 0 };
int err;
err = dsl_pool_hold(dsname, FTAG, &dp);
if (err != 0)
return (err);
err = dsl_dataset_hold(dp, dsname, FTAG, &ds);
if (err != 0) {
dsl_pool_rele(dp, FTAG);
return (err);
}
err = dsl_bookmark_lookup_impl(ds, bmname, &bmark_phys);
if (err != 0)
goto out;
dsl_bookmark_fetch_props(dp, &bmark_phys, NULL, props);
out:
dsl_dataset_rele(ds, FTAG);
dsl_pool_rele(dp, FTAG);
return (err);
}
typedef struct dsl_bookmark_destroy_arg {
nvlist_t *dbda_bmarks;
nvlist_t *dbda_success;
nvlist_t *dbda_errors;
} dsl_bookmark_destroy_arg_t;
static void
dsl_bookmark_destroy_sync_impl(dsl_dataset_t *ds, const char *name,
dmu_tx_t *tx)
{
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
uint64_t bmark_zapobj = ds->ds_bookmarks_obj;
matchtype_t mt = 0;
uint64_t int_size, num_ints;
/*
* 'search' must be zeroed so that dbn_flags (which is used in
* dsl_bookmark_compare()) will be zeroed even if the on-disk
* (in ZAP) bookmark is shorter than offsetof(dbn_flags).
*/
dsl_bookmark_node_t search = { 0 };
char realname[ZFS_MAX_DATASET_NAME_LEN];
/*
* Find the real name of this bookmark, which may be different
* from the given name if the dataset is case-insensitive. Then
* use the real name to find the node in the ds_bookmarks AVL tree.
*/
if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
mt = MT_NORMALIZE;
VERIFY0(zap_length(mos, bmark_zapobj, name, &int_size, &num_ints));
ASSERT3U(int_size, ==, sizeof (uint64_t));
if (num_ints * int_size > BOOKMARK_PHYS_SIZE_V1) {
spa_feature_decr(dmu_objset_spa(mos),
SPA_FEATURE_BOOKMARK_V2, tx);
}
VERIFY0(zap_lookup_norm(mos, bmark_zapobj, name, sizeof (uint64_t),
num_ints, &search.dbn_phys, mt, realname, sizeof (realname), NULL));
search.dbn_name = realname;
dsl_bookmark_node_t *dbn = avl_find(&ds->ds_bookmarks, &search, NULL);
ASSERT(dbn != NULL);
if (dbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN) {
/*
* If this bookmark HAS_FBN, and it is before the most
* recent snapshot, then its TXG is a key in the head's
* deadlist (and all clones' heads' deadlists). If this is
* the last thing keeping the key (i.e. there are no more
* bookmarks with HAS_FBN at this TXG, and there is no
* snapshot at this TXG), then remove the key.
*
* Note that this algorithm depends on ds_bookmarks being
* sorted such that all bookmarks at the same TXG with
* HAS_FBN are adjacent (with no non-HAS_FBN bookmarks
* at the same TXG in between them). If this were not
* the case, we would need to examine *all* bookmarks
* at this TXG, rather than just the adjacent ones.
*/
dsl_bookmark_node_t *dbn_prev =
AVL_PREV(&ds->ds_bookmarks, dbn);
dsl_bookmark_node_t *dbn_next =
AVL_NEXT(&ds->ds_bookmarks, dbn);
boolean_t more_bookmarks_at_this_txg =
(dbn_prev != NULL && dbn_prev->dbn_phys.zbm_creation_txg ==
dbn->dbn_phys.zbm_creation_txg &&
(dbn_prev->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN)) ||
(dbn_next != NULL && dbn_next->dbn_phys.zbm_creation_txg ==
dbn->dbn_phys.zbm_creation_txg &&
(dbn_next->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN));
if (!(dbn->dbn_phys.zbm_flags & ZBM_FLAG_SNAPSHOT_EXISTS) &&
!more_bookmarks_at_this_txg &&
dbn->dbn_phys.zbm_creation_txg <
dsl_dataset_phys(ds)->ds_prev_snap_txg) {
dsl_dir_remove_clones_key(ds->ds_dir,
dbn->dbn_phys.zbm_creation_txg, tx);
dsl_deadlist_remove_key(&ds->ds_deadlist,
dbn->dbn_phys.zbm_creation_txg, tx);
}
spa_feature_decr(dmu_objset_spa(mos),
SPA_FEATURE_BOOKMARK_WRITTEN, tx);
}
if (dbn->dbn_phys.zbm_redaction_obj != 0) {
VERIFY0(dmu_object_free(mos,
dbn->dbn_phys.zbm_redaction_obj, tx));
spa_feature_decr(dmu_objset_spa(mos),
SPA_FEATURE_REDACTION_BOOKMARKS, tx);
}
avl_remove(&ds->ds_bookmarks, dbn);
spa_strfree(dbn->dbn_name);
mutex_destroy(&dbn->dbn_lock);
kmem_free(dbn, sizeof (*dbn));
VERIFY0(zap_remove_norm(mos, bmark_zapobj, name, mt, tx));
}
static int
dsl_bookmark_destroy_check(void *arg, dmu_tx_t *tx)
{
dsl_bookmark_destroy_arg_t *dbda = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
int rv = 0;
ASSERT(nvlist_empty(dbda->dbda_success));
ASSERT(nvlist_empty(dbda->dbda_errors));
if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARKS))
return (0);
for (nvpair_t *pair = nvlist_next_nvpair(dbda->dbda_bmarks, NULL);
pair != NULL; pair = nvlist_next_nvpair(dbda->dbda_bmarks, pair)) {
const char *fullname = nvpair_name(pair);
dsl_dataset_t *ds;
zfs_bookmark_phys_t bm;
int error;
char *shortname;
error = dsl_bookmark_hold_ds(dp, fullname, &ds,
FTAG, &shortname);
if (error == ENOENT) {
/* ignore it; the bookmark is "already destroyed" */
continue;
}
if (error == 0) {
error = dsl_bookmark_lookup_impl(ds, shortname, &bm);
dsl_dataset_rele(ds, FTAG);
if (error == ESRCH) {
/*
* ignore it; the bookmark is
* "already destroyed"
*/
continue;
}
if (error == 0 && bm.zbm_redaction_obj != 0) {
redaction_list_t *rl = NULL;
error = dsl_redaction_list_hold_obj(tx->tx_pool,
bm.zbm_redaction_obj, FTAG, &rl);
if (error == ENOENT) {
error = 0;
} else if (error == 0 &&
dsl_redaction_list_long_held(rl)) {
error = SET_ERROR(EBUSY);
}
if (rl != NULL) {
dsl_redaction_list_rele(rl, FTAG);
}
}
}
if (error == 0) {
if (dmu_tx_is_syncing(tx)) {
fnvlist_add_boolean(dbda->dbda_success,
fullname);
}
} else {
fnvlist_add_int32(dbda->dbda_errors, fullname, error);
rv = error;
}
}
return (rv);
}
static void
dsl_bookmark_destroy_sync(void *arg, dmu_tx_t *tx)
{
dsl_bookmark_destroy_arg_t *dbda = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
objset_t *mos = dp->dp_meta_objset;
for (nvpair_t *pair = nvlist_next_nvpair(dbda->dbda_success, NULL);
pair != NULL; pair = nvlist_next_nvpair(dbda->dbda_success, pair)) {
dsl_dataset_t *ds;
char *shortname;
uint64_t zap_cnt;
VERIFY0(dsl_bookmark_hold_ds(dp, nvpair_name(pair),
&ds, FTAG, &shortname));
dsl_bookmark_destroy_sync_impl(ds, shortname, tx);
/*
* If all of this dataset's bookmarks have been destroyed,
* free the zap object and decrement the feature's use count.
*/
VERIFY0(zap_count(mos, ds->ds_bookmarks_obj, &zap_cnt));
if (zap_cnt == 0) {
dmu_buf_will_dirty(ds->ds_dbuf, tx);
VERIFY0(zap_destroy(mos, ds->ds_bookmarks_obj, tx));
ds->ds_bookmarks_obj = 0;
spa_feature_decr(dp->dp_spa, SPA_FEATURE_BOOKMARKS, tx);
VERIFY0(zap_remove(mos, ds->ds_object,
DS_FIELD_BOOKMARK_NAMES, tx));
}
spa_history_log_internal_ds(ds, "remove bookmark", tx,
"name=%s", shortname);
dsl_dataset_rele(ds, FTAG);
}
}
/*
* The bookmarks must all be in the same pool.
*/
int
dsl_bookmark_destroy(nvlist_t *bmarks, nvlist_t *errors)
{
int rv;
dsl_bookmark_destroy_arg_t dbda;
nvpair_t *pair = nvlist_next_nvpair(bmarks, NULL);
if (pair == NULL)
return (0);
dbda.dbda_bmarks = bmarks;
dbda.dbda_errors = errors;
dbda.dbda_success = fnvlist_alloc();
rv = dsl_sync_task(nvpair_name(pair), dsl_bookmark_destroy_check,
dsl_bookmark_destroy_sync, &dbda, fnvlist_num_pairs(bmarks),
ZFS_SPACE_CHECK_RESERVED);
fnvlist_free(dbda.dbda_success);
return (rv);
}
/* Return B_TRUE if there are any long holds on this dataset. */
boolean_t
dsl_redaction_list_long_held(redaction_list_t *rl)
{
return (!zfs_refcount_is_zero(&rl->rl_longholds));
}
void
dsl_redaction_list_long_hold(dsl_pool_t *dp, redaction_list_t *rl, void *tag)
{
ASSERT(dsl_pool_config_held(dp));
(void) zfs_refcount_add(&rl->rl_longholds, tag);
}
void
dsl_redaction_list_long_rele(redaction_list_t *rl, void *tag)
{
(void) zfs_refcount_remove(&rl->rl_longholds, tag);
}
/* ARGSUSED */
static void
redaction_list_evict_sync(void *rlu)
{
redaction_list_t *rl = rlu;
zfs_refcount_destroy(&rl->rl_longholds);
kmem_free(rl, sizeof (redaction_list_t));
}
void
dsl_redaction_list_rele(redaction_list_t *rl, void *tag)
{
dmu_buf_rele(rl->rl_dbuf, tag);
}
int
dsl_redaction_list_hold_obj(dsl_pool_t *dp, uint64_t rlobj, void *tag,
redaction_list_t **rlp)
{
objset_t *mos = dp->dp_meta_objset;
dmu_buf_t *dbuf;
redaction_list_t *rl;
int err;
ASSERT(dsl_pool_config_held(dp));
err = dmu_bonus_hold(mos, rlobj, tag, &dbuf);
if (err != 0)
return (err);
rl = dmu_buf_get_user(dbuf);
if (rl == NULL) {
redaction_list_t *winner = NULL;
rl = kmem_zalloc(sizeof (redaction_list_t), KM_SLEEP);
rl->rl_dbuf = dbuf;
rl->rl_object = rlobj;
rl->rl_phys = dbuf->db_data;
rl->rl_mos = dp->dp_meta_objset;
zfs_refcount_create(&rl->rl_longholds);
dmu_buf_init_user(&rl->rl_dbu, redaction_list_evict_sync, NULL,
&rl->rl_dbuf);
if ((winner = dmu_buf_set_user_ie(dbuf, &rl->rl_dbu)) != NULL) {
kmem_free(rl, sizeof (*rl));
rl = winner;
}
}
*rlp = rl;
return (0);
}
/*
* Snapshot ds is being destroyed.
*
* Adjust the "freed_before_next" of any bookmarks between this snap
* and the previous snapshot, because their "next snapshot" is changing.
*
* If there are any bookmarks with HAS_FBN at this snapshot, remove
* their HAS_SNAP flag (note: there can be at most one snapshot of
* each filesystem at a given txg), and return B_TRUE. In this case
* the caller can not remove the key in the deadlist at this TXG, because
* the HAS_FBN bookmarks require the key be there.
*
* Returns B_FALSE if there are no bookmarks with HAS_FBN at this
* snapshot's TXG. In this case the caller can remove the key in the
* deadlist at this TXG.
*/
boolean_t
dsl_bookmark_ds_destroyed(dsl_dataset_t *ds, dmu_tx_t *tx)
{
dsl_pool_t *dp = ds->ds_dir->dd_pool;
dsl_dataset_t *head, *next;
VERIFY0(dsl_dataset_hold_obj(dp,
dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, FTAG, &head));
VERIFY0(dsl_dataset_hold_obj(dp,
dsl_dataset_phys(ds)->ds_next_snap_obj, FTAG, &next));
/*
* Find the first bookmark that HAS_FBN at or after the
* previous snapshot.
*/
dsl_bookmark_node_t search = { 0 };
avl_index_t idx;
search.dbn_phys.zbm_creation_txg =
dsl_dataset_phys(ds)->ds_prev_snap_txg;
search.dbn_phys.zbm_flags = ZBM_FLAG_HAS_FBN;
/*
* The empty-string name can't be in the AVL, and it compares
* before any entries with this TXG.
*/
search.dbn_name = "";
VERIFY3P(avl_find(&head->ds_bookmarks, &search, &idx), ==, NULL);
dsl_bookmark_node_t *dbn =
avl_nearest(&head->ds_bookmarks, idx, AVL_AFTER);
/*
* Iterate over all bookmarks that are at or after the previous
* snapshot, and before this (being deleted) snapshot. Adjust
* their FBN based on their new next snapshot.
*/
for (; dbn != NULL && dbn->dbn_phys.zbm_creation_txg <
dsl_dataset_phys(ds)->ds_creation_txg;
dbn = AVL_NEXT(&head->ds_bookmarks, dbn)) {
if (!(dbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN))
continue;
/*
* Increase our FBN by the amount of space that was live
* (referenced) at the time of this bookmark (i.e.
* birth <= zbm_creation_txg), and killed between this
* (being deleted) snapshot and the next snapshot (i.e.
* on the next snapshot's deadlist). (Space killed before
* this are already on our FBN.)
*/
uint64_t referenced, compressed, uncompressed;
dsl_deadlist_space_range(&next->ds_deadlist,
0, dbn->dbn_phys.zbm_creation_txg,
&referenced, &compressed, &uncompressed);
dbn->dbn_phys.zbm_referenced_freed_before_next_snap +=
referenced;
dbn->dbn_phys.zbm_compressed_freed_before_next_snap +=
compressed;
dbn->dbn_phys.zbm_uncompressed_freed_before_next_snap +=
uncompressed;
VERIFY0(zap_update(dp->dp_meta_objset, head->ds_bookmarks_obj,
dbn->dbn_name, sizeof (uint64_t),
sizeof (zfs_bookmark_phys_t) / sizeof (uint64_t),
&dbn->dbn_phys, tx));
}
dsl_dataset_rele(next, FTAG);
/*
* There may be several bookmarks at this txg (the TXG of the
* snapshot being deleted). We need to clear the SNAPSHOT_EXISTS
* flag on all of them, and return TRUE if there is at least 1
* bookmark here with HAS_FBN (thus preventing the deadlist
* key from being removed).
*/
boolean_t rv = B_FALSE;
for (; dbn != NULL && dbn->dbn_phys.zbm_creation_txg ==
dsl_dataset_phys(ds)->ds_creation_txg;
dbn = AVL_NEXT(&head->ds_bookmarks, dbn)) {
if (!(dbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN)) {
ASSERT(!(dbn->dbn_phys.zbm_flags &
ZBM_FLAG_SNAPSHOT_EXISTS));
continue;
}
ASSERT(dbn->dbn_phys.zbm_flags & ZBM_FLAG_SNAPSHOT_EXISTS);
dbn->dbn_phys.zbm_flags &= ~ZBM_FLAG_SNAPSHOT_EXISTS;
VERIFY0(zap_update(dp->dp_meta_objset, head->ds_bookmarks_obj,
dbn->dbn_name, sizeof (uint64_t),
sizeof (zfs_bookmark_phys_t) / sizeof (uint64_t),
&dbn->dbn_phys, tx));
rv = B_TRUE;
}
dsl_dataset_rele(head, FTAG);
return (rv);
}
/*
* A snapshot is being created of this (head) dataset.
*
* We don't keep keys in the deadlist for the most recent snapshot, or any
* bookmarks at or after it, because there can't be any blocks on the
* deadlist in this range. Now that the most recent snapshot is after
* all bookmarks, we need to add these keys. Note that the caller always
* adds a key at the previous snapshot, so we only add keys for bookmarks
* after that.
*/
void
dsl_bookmark_snapshotted(dsl_dataset_t *ds, dmu_tx_t *tx)
{
uint64_t last_key_added = UINT64_MAX;
for (dsl_bookmark_node_t *dbn = avl_last(&ds->ds_bookmarks);
dbn != NULL && dbn->dbn_phys.zbm_creation_txg >
dsl_dataset_phys(ds)->ds_prev_snap_txg;
dbn = AVL_PREV(&ds->ds_bookmarks, dbn)) {
uint64_t creation_txg = dbn->dbn_phys.zbm_creation_txg;
ASSERT3U(creation_txg, <=, last_key_added);
/*
* Note, there may be multiple bookmarks at this TXG,
* and we only want to add the key for this TXG once.
* The ds_bookmarks AVL is sorted by TXG, so we will visit
* these bookmarks in sequence.
*/
if ((dbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN) &&
creation_txg != last_key_added) {
dsl_deadlist_add_key(&ds->ds_deadlist,
creation_txg, tx);
last_key_added = creation_txg;
}
}
}
/*
* The next snapshot of the origin dataset has changed, due to
* promote or clone swap. If there are any bookmarks at this dataset,
* we need to update their zbm_*_freed_before_next_snap to reflect this.
* The head dataset has the relevant bookmarks in ds_bookmarks.
*/
void
dsl_bookmark_next_changed(dsl_dataset_t *head, dsl_dataset_t *origin,
dmu_tx_t *tx)
{
dsl_pool_t *dp = dmu_tx_pool(tx);
/*
* Find the first bookmark that HAS_FBN at the origin snapshot.
*/
dsl_bookmark_node_t search = { 0 };
avl_index_t idx;
search.dbn_phys.zbm_creation_txg =
dsl_dataset_phys(origin)->ds_creation_txg;
search.dbn_phys.zbm_flags = ZBM_FLAG_HAS_FBN;
/*
* The empty-string name can't be in the AVL, and it compares
* before any entries with this TXG.
*/
search.dbn_name = "";
VERIFY3P(avl_find(&head->ds_bookmarks, &search, &idx), ==, NULL);
dsl_bookmark_node_t *dbn =
avl_nearest(&head->ds_bookmarks, idx, AVL_AFTER);
/*
* Iterate over all bookmarks that are at the origin txg.
* Adjust their FBN based on their new next snapshot.
*/
for (; dbn != NULL && dbn->dbn_phys.zbm_creation_txg ==
dsl_dataset_phys(origin)->ds_creation_txg &&
(dbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN);
dbn = AVL_NEXT(&head->ds_bookmarks, dbn)) {
/*
* Bookmark is at the origin, therefore its
* "next dataset" is changing, so we need
* to reset its FBN by recomputing it in
* dsl_bookmark_set_phys().
*/
ASSERT3U(dbn->dbn_phys.zbm_guid, ==,
dsl_dataset_phys(origin)->ds_guid);
ASSERT3U(dbn->dbn_phys.zbm_referenced_bytes_refd, ==,
dsl_dataset_phys(origin)->ds_referenced_bytes);
ASSERT(dbn->dbn_phys.zbm_flags &
ZBM_FLAG_SNAPSHOT_EXISTS);
/*
* Save and restore the zbm_redaction_obj, which
* is zeroed by dsl_bookmark_set_phys().
*/
uint64_t redaction_obj =
dbn->dbn_phys.zbm_redaction_obj;
dsl_bookmark_set_phys(&dbn->dbn_phys, origin);
dbn->dbn_phys.zbm_redaction_obj = redaction_obj;
VERIFY0(zap_update(dp->dp_meta_objset, head->ds_bookmarks_obj,
dbn->dbn_name, sizeof (uint64_t),
sizeof (zfs_bookmark_phys_t) / sizeof (uint64_t),
&dbn->dbn_phys, tx));
}
}
/*
* This block is no longer referenced by this (head) dataset.
*
* Adjust the FBN of any bookmarks that reference this block, whose "next"
* is the head dataset.
*/
/* ARGSUSED */
void
dsl_bookmark_block_killed(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx)
{
/*
* Iterate over bookmarks whose "next" is the head dataset.
*/
for (dsl_bookmark_node_t *dbn = avl_last(&ds->ds_bookmarks);
dbn != NULL && dbn->dbn_phys.zbm_creation_txg >=
dsl_dataset_phys(ds)->ds_prev_snap_txg;
dbn = AVL_PREV(&ds->ds_bookmarks, dbn)) {
/*
* If the block was live (referenced) at the time of this
* bookmark, add its space to the bookmark's FBN.
*/
if (bp->blk_birth <= dbn->dbn_phys.zbm_creation_txg &&
(dbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN)) {
mutex_enter(&dbn->dbn_lock);
dbn->dbn_phys.zbm_referenced_freed_before_next_snap +=
bp_get_dsize_sync(dsl_dataset_get_spa(ds), bp);
dbn->dbn_phys.zbm_compressed_freed_before_next_snap +=
BP_GET_PSIZE(bp);
dbn->dbn_phys.zbm_uncompressed_freed_before_next_snap +=
BP_GET_UCSIZE(bp);
/*
* Changing the ZAP object here would be too
* expensive. Also, we may be called from the zio
* interrupt thread, which can't block on i/o.
* Therefore, we mark this bookmark as dirty and
* modify the ZAP once per txg, in
* dsl_bookmark_sync_done().
*/
dbn->dbn_dirty = B_TRUE;
mutex_exit(&dbn->dbn_lock);
}
}
}
void
dsl_bookmark_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx)
{
dsl_pool_t *dp = dmu_tx_pool(tx);
if (dsl_dataset_is_snapshot(ds))
return;
/*
* We only dirty bookmarks that are at or after the most recent
* snapshot. We can't create snapshots between
* dsl_bookmark_block_killed() and dsl_bookmark_sync_done(), so we
* don't need to look at any bookmarks before ds_prev_snap_txg.
*/
for (dsl_bookmark_node_t *dbn = avl_last(&ds->ds_bookmarks);
dbn != NULL && dbn->dbn_phys.zbm_creation_txg >=
dsl_dataset_phys(ds)->ds_prev_snap_txg;
dbn = AVL_PREV(&ds->ds_bookmarks, dbn)) {
if (dbn->dbn_dirty) {
/*
* We only dirty nodes with HAS_FBN, therefore
* we can always use the current bookmark struct size.
*/
ASSERT(dbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN);
VERIFY0(zap_update(dp->dp_meta_objset,
ds->ds_bookmarks_obj,
dbn->dbn_name, sizeof (uint64_t),
sizeof (zfs_bookmark_phys_t) / sizeof (uint64_t),
&dbn->dbn_phys, tx));
dbn->dbn_dirty = B_FALSE;
}
}
#ifdef ZFS_DEBUG
for (dsl_bookmark_node_t *dbn = avl_first(&ds->ds_bookmarks);
dbn != NULL; dbn = AVL_NEXT(&ds->ds_bookmarks, dbn)) {
ASSERT(!dbn->dbn_dirty);
}
#endif
}
/*
* Return the TXG of the most recent bookmark (or 0 if there are no bookmarks).
*/
uint64_t
dsl_bookmark_latest_txg(dsl_dataset_t *ds)
{
ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
dsl_bookmark_node_t *dbn = avl_last(&ds->ds_bookmarks);
if (dbn == NULL)
return (0);
return (dbn->dbn_phys.zbm_creation_txg);
}
static inline unsigned int
redact_block_buf_num_entries(unsigned int size)
{
return (size / sizeof (redact_block_phys_t));
}
/*
* This function calculates the offset of the last entry in the array of
* redact_block_phys_t. If we're reading the redaction list into buffers of
* size bufsize, then for all but the last buffer, the last valid entry in the
* array will be the last entry in the array. However, for the last buffer, any
* amount of it may be filled. Thus, we check to see if we're looking at the
* last buffer in the redaction list, and if so, we return the total number of
* entries modulo the number of entries per buffer. Otherwise, we return the
* number of entries per buffer minus one.
*/
static inline unsigned int
last_entry(redaction_list_t *rl, unsigned int bufsize, uint64_t bufid)
{
if (bufid == (rl->rl_phys->rlp_num_entries - 1) /
redact_block_buf_num_entries(bufsize)) {
return ((rl->rl_phys->rlp_num_entries - 1) %
redact_block_buf_num_entries(bufsize));
}
return (redact_block_buf_num_entries(bufsize) - 1);
}
/*
* Compare the redact_block_phys_t to the bookmark. If the last block in the
* redact_block_phys_t is before the bookmark, return -1. If the first block in
* the redact_block_phys_t is after the bookmark, return 1. Otherwise, the
* bookmark is inside the range of the redact_block_phys_t, and we return 0.
*/
static int
redact_block_zb_compare(redact_block_phys_t *first,
zbookmark_phys_t *second)
{
/*
* If the block_phys is for a previous object, or the last block in the
* block_phys is strictly before the block in the bookmark, the
* block_phys is earlier.
*/
if (first->rbp_object < second->zb_object ||
(first->rbp_object == second->zb_object &&
first->rbp_blkid + (redact_block_get_count(first) - 1) <
second->zb_blkid)) {
return (-1);
}
/*
* If the bookmark is for a previous object, or the block in the
* bookmark is strictly before the first block in the block_phys, the
* bookmark is earlier.
*/
if (first->rbp_object > second->zb_object ||
(first->rbp_object == second->zb_object &&
first->rbp_blkid > second->zb_blkid)) {
return (1);
}
return (0);
}
/*
* Traverse the redaction list in the provided object, and call the callback for
* each entry we find. Don't call the callback for any records before resume.
*/
int
dsl_redaction_list_traverse(redaction_list_t *rl, zbookmark_phys_t *resume,
rl_traverse_callback_t cb, void *arg)
{
objset_t *mos = rl->rl_mos;
redact_block_phys_t *buf;
unsigned int bufsize = SPA_OLD_MAXBLOCKSIZE;
int err = 0;
if (rl->rl_phys->rlp_last_object != UINT64_MAX ||
rl->rl_phys->rlp_last_blkid != UINT64_MAX) {
/*
* When we finish a send, we update the last object and offset
* to UINT64_MAX. If a send fails partway through, the last
* object and offset will have some other value, indicating how
* far the send got. The redaction list must be complete before
* it can be traversed, so return EINVAL if the last object and
* blkid are not set to UINT64_MAX.
*/
return (SET_ERROR(EINVAL));
}
/*
* Binary search for the point to resume from. The goal is to minimize
* the number of disk reads we have to perform.
*/
buf = zio_data_buf_alloc(bufsize);
uint64_t maxbufid = (rl->rl_phys->rlp_num_entries - 1) /
redact_block_buf_num_entries(bufsize);
uint64_t minbufid = 0;
while (resume != NULL && maxbufid - minbufid >= 1) {
ASSERT3U(maxbufid, >, minbufid);
uint64_t midbufid = minbufid + ((maxbufid - minbufid) / 2);
err = dmu_read(mos, rl->rl_object, midbufid * bufsize, bufsize,
buf, DMU_READ_NO_PREFETCH);
if (err != 0)
break;
int cmp0 = redact_block_zb_compare(&buf[0], resume);
int cmpn = redact_block_zb_compare(
&buf[last_entry(rl, bufsize, maxbufid)], resume);
/*
* If the first block is before or equal to the resume point,
* and the last one is equal or after, then the resume point is
* in this buf, and we should start here.
*/
if (cmp0 <= 0 && cmpn >= 0)
break;
if (cmp0 > 0)
maxbufid = midbufid - 1;
else if (cmpn < 0)
minbufid = midbufid + 1;
else
panic("No progress in binary search for resume point");
}
for (uint64_t curidx = minbufid * redact_block_buf_num_entries(bufsize);
err == 0 && curidx < rl->rl_phys->rlp_num_entries;
curidx++) {
/*
* We read in the redaction list one block at a time. Once we
* finish with all the entries in a given block, we read in a
* new one. The predictive prefetcher will take care of any
* prefetching, and this code shouldn't be the bottleneck, so we
* don't need to do manual prefetching.
*/
if (curidx % redact_block_buf_num_entries(bufsize) == 0) {
err = dmu_read(mos, rl->rl_object, curidx *
sizeof (*buf), bufsize, buf,
DMU_READ_PREFETCH);
if (err != 0)
break;
}
redact_block_phys_t *rb = &buf[curidx %
redact_block_buf_num_entries(bufsize)];
/*
* If resume is non-null, we should either not send the data, or
* null out resume so we don't have to keep doing these
* comparisons.
*/
if (resume != NULL) {
if (redact_block_zb_compare(rb, resume) < 0) {
continue;
} else {
/*
* If the place to resume is in the middle of
* the range described by this
* redact_block_phys, then modify the
* redact_block_phys in memory so we generate
* the right records.
*/
if (resume->zb_object == rb->rbp_object &&
resume->zb_blkid > rb->rbp_blkid) {
uint64_t diff = resume->zb_blkid -
rb->rbp_blkid;
rb->rbp_blkid = resume->zb_blkid;
redact_block_set_count(rb,
redact_block_get_count(rb) - diff);
}
resume = NULL;
}
}
if (cb(rb, arg) != 0)
break;
}
zio_data_buf_free(buf, bufsize);
return (err);
}
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