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mirror_zfs/module/zfs/dsl_dataset.c
Brian Behlendorf 3558fd73b5 Prototype/structure update for Linux 
I appologize in advance why to many things ended up in this commit.
When it could be seperated in to a whole series of commits teasing
that all apart now would take considerable time and I'm not sure
there's much merrit in it.  As such I'll just summerize the intent
of the changes which are all (or partly) in this commit.  Broadly
the intent is to remove as much Solaris specific code as possible
and replace it with native Linux equivilants.  More specifically:

1) Replace all instances of zfsvfs_t with zfs_sb_t.  While the
type is largely the same calling it private super block data
rather than a zfsvfs is more consistent with how Linux names
this.  While non critical it makes the code easier to read when
your thinking in Linux friendly VFS terms.

2) Replace vnode_t with struct inode.  The Linux VFS doesn't have
the notion of a vnode and there's absolutely no good reason to
create one.  There are in fact several good reasons to remove it.
It just adds overhead on Linux if we were to manage one, it
conplicates the code, and it likely will lead to bugs so there's
a good change it will be out of date.  The code has been updated
to remove all need for this type.

3) Replace all vtype_t's with umode types.  Along with this shift
all uses of types to mode bits.  The Solaris code would pass a
vtype which is redundant with the Linux mode.  Just update all the
code to use the Linux mode macros and remove this redundancy.

4) Remove using of vn_* helpers and replace where needed with
inode helpers.  The big example here is creating iput_aync to
replace vn_rele_async.  Other vn helpers will be addressed as
needed but they should be be emulated.  They are a Solaris VFS'ism
and should simply be replaced with Linux equivilants.

5) Update znode alloc/free code.  Under Linux it's common to
embed the inode specific data with the inode itself.  This removes
the need for an extra memory allocation.  In zfs this information
is called a znode and it now embeds the inode with it.  Allocators
have been updated accordingly.

6) Minimal integration with the vfs flags for setting up the
super block and handling mount options has been added this
code will need to be refined but functionally it's all there.

This will be the first and last of these to large to review commits.
2011-02-10 09:27:21 -08:00

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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 http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
*/
#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_tx.h>
#include <sys/arc.h>
#include <sys/zio.h>
#include <sys/zap.h>
#include <sys/unique.h>
#include <sys/zfs_context.h>
#include <sys/zfs_ioctl.h>
#include <sys/spa.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>
static char *dsl_reaper = "the grim reaper";
static dsl_checkfunc_t dsl_dataset_destroy_begin_check;
static dsl_syncfunc_t dsl_dataset_destroy_begin_sync;
static dsl_syncfunc_t dsl_dataset_set_reservation_sync;
#define SWITCH64(x, y) \
{ \
uint64_t __tmp = (x); \
(x) = (y); \
(y) = __tmp; \
}
#define DS_REF_MAX (1ULL << 62)
#define DSL_DEADLIST_BLOCKSIZE SPA_MAXBLOCKSIZE
#define DSL_DATASET_IS_DESTROYED(ds) ((ds)->ds_owner == dsl_reaper)
/*
* Figure out how much of this delta should be propogated 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)
{
uint64_t old_bytes, new_bytes;
if (ds->ds_reserved == 0)
return (delta);
old_bytes = MAX(ds->ds_phys->ds_unique_bytes, ds->ds_reserved);
new_bytes = MAX(ds->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)
{
int used, compressed, uncompressed;
int64_t delta;
used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
compressed = BP_GET_PSIZE(bp);
uncompressed = BP_GET_UCSIZE(bp);
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))
return;
ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE);
ASSERT3U(BP_GET_TYPE(bp), <, DMU_OT_NUMTYPES);
if (ds == NULL) {
/*
* Account for the meta-objset space in its placeholder
* dsl_dir.
*/
ASSERT3U(compressed, ==, uncompressed); /* it's all metadata */
dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, DD_USED_HEAD,
used, compressed, uncompressed, tx);
dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx);
return;
}
dmu_buf_will_dirty(ds->ds_dbuf, tx);
mutex_enter(&ds->ds_dir->dd_lock);
mutex_enter(&ds->ds_lock);
delta = parent_delta(ds, used);
ds->ds_phys->ds_used_bytes += used;
ds->ds_phys->ds_compressed_bytes += compressed;
ds->ds_phys->ds_uncompressed_bytes += uncompressed;
ds->ds_phys->ds_unique_bytes += used;
mutex_exit(&ds->ds_lock);
dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta,
compressed, uncompressed, tx);
dsl_dir_transfer_space(ds->ds_dir, used - delta,
DD_USED_REFRSRV, DD_USED_HEAD, tx);
mutex_exit(&ds->ds_dir->dd_lock);
}
int
dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx,
boolean_t async)
{
int used, compressed, uncompressed;
if (BP_IS_HOLE(bp))
return (0);
ASSERT(dmu_tx_is_syncing(tx));
ASSERT(bp->blk_birth <= tx->tx_txg);
used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
compressed = BP_GET_PSIZE(bp);
uncompressed = BP_GET_UCSIZE(bp);
ASSERT(used > 0);
if (ds == NULL) {
/*
* Account for the meta-objset space in its placeholder
* dataset.
*/
dsl_free(tx->tx_pool, tx->tx_txg, bp);
dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, DD_USED_HEAD,
-used, -compressed, -uncompressed, tx);
dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx);
return (used);
}
ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool);
ASSERT(!dsl_dataset_is_snapshot(ds));
dmu_buf_will_dirty(ds->ds_dbuf, tx);
if (bp->blk_birth > ds->ds_phys->ds_prev_snap_txg) {
int64_t delta;
dprintf_bp(bp, "freeing ds=%llu", ds->ds_object);
dsl_free(tx->tx_pool, tx->tx_txg, bp);
mutex_enter(&ds->ds_dir->dd_lock);
mutex_enter(&ds->ds_lock);
ASSERT(ds->ds_phys->ds_unique_bytes >= used ||
!DS_UNIQUE_IS_ACCURATE(ds));
delta = parent_delta(ds, -used);
ds->ds_phys->ds_unique_bytes -= used;
mutex_exit(&ds->ds_lock);
dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD,
delta, -compressed, -uncompressed, tx);
dsl_dir_transfer_space(ds->ds_dir, -used - delta,
DD_USED_REFRSRV, DD_USED_HEAD, tx);
mutex_exit(&ds->ds_dir->dd_lock);
} 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, tx);
}
ASSERT3U(ds->ds_prev->ds_object, ==,
ds->ds_phys->ds_prev_snap_obj);
ASSERT(ds->ds_prev->ds_phys->ds_num_children > 0);
/* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
if (ds->ds_prev->ds_phys->ds_next_snap_obj ==
ds->ds_object && bp->blk_birth >
ds->ds_prev->ds_phys->ds_prev_snap_txg) {
dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
mutex_enter(&ds->ds_prev->ds_lock);
ds->ds_prev->ds_phys->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);
}
}
mutex_enter(&ds->ds_lock);
ASSERT3U(ds->ds_phys->ds_used_bytes, >=, used);
ds->ds_phys->ds_used_bytes -= used;
ASSERT3U(ds->ds_phys->ds_compressed_bytes, >=, compressed);
ds->ds_phys->ds_compressed_bytes -= compressed;
ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, >=, uncompressed);
ds->ds_phys->ds_uncompressed_bytes -= uncompressed;
mutex_exit(&ds->ds_lock);
return (used);
}
uint64_t
dsl_dataset_prev_snap_txg(dsl_dataset_t *ds)
{
uint64_t trysnap = 0;
if (ds == NULL)
return (0);
/*
* The snapshot creation could fail, but that would cause an
* incorrect FALSE return, which would only result in an
* overestimation of the amount of space that an operation would
* consume, which is OK.
*
* There's also a small window where we could miss a pending
* snapshot, because we could set the sync task in the quiescing
* phase. So this should only be used as a guess.
*/
if (ds->ds_trysnap_txg >
spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa))
trysnap = ds->ds_trysnap_txg;
return (MAX(ds->ds_phys->ds_prev_snap_txg, trysnap));
}
boolean_t
dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp,
uint64_t blk_birth)
{
if (blk_birth <= dsl_dataset_prev_snap_txg(ds))
return (B_FALSE);
ddt_prefetch(dsl_dataset_get_spa(ds), bp);
return (B_TRUE);
}
/* ARGSUSED */
static void
dsl_dataset_evict(dmu_buf_t *db, void *dsv)
{
dsl_dataset_t *ds = dsv;
ASSERT(ds->ds_owner == NULL || DSL_DATASET_IS_DESTROYED(ds));
unique_remove(ds->ds_fsid_guid);
if (ds->ds_objset != NULL)
dmu_objset_evict(ds->ds_objset);
if (ds->ds_prev) {
dsl_dataset_drop_ref(ds->ds_prev, ds);
ds->ds_prev = NULL;
}
bplist_destroy(&ds->ds_pending_deadlist);
if (db != NULL) {
dsl_deadlist_close(&ds->ds_deadlist);
} else {
ASSERT(ds->ds_deadlist.dl_dbuf == NULL);
ASSERT(!ds->ds_deadlist.dl_oldfmt);
}
if (ds->ds_dir)
dsl_dir_close(ds->ds_dir, ds);
ASSERT(!list_link_active(&ds->ds_synced_link));
mutex_destroy(&ds->ds_lock);
mutex_destroy(&ds->ds_recvlock);
mutex_destroy(&ds->ds_opening_lock);
rw_destroy(&ds->ds_rwlock);
cv_destroy(&ds->ds_exclusive_cv);
kmem_free(ds, sizeof (dsl_dataset_t));
}
static 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 (ds->ds_phys->ds_next_snap_obj == 0)
return (0);
err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj,
FTAG, &headdbuf);
if (err)
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);
dmu_buf_rele(headdbuf, FTAG);
return (err);
}
static 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 = ds->ds_phys->ds_snapnames_zapobj;
matchtype_t mt;
int err;
if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET)
mt = MT_FIRST;
else
mt = MT_EXACT;
err = zap_lookup_norm(mos, snapobj, name, 8, 1,
value, mt, NULL, 0, NULL);
if (err == ENOTSUP && mt == MT_FIRST)
err = zap_lookup(mos, snapobj, name, 8, 1, value);
return (err);
}
static int
dsl_dataset_snap_remove(dsl_dataset_t *ds, char *name, dmu_tx_t *tx)
{
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj;
matchtype_t mt;
int err;
dsl_dir_snap_cmtime_update(ds->ds_dir);
if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET)
mt = MT_FIRST;
else
mt = MT_EXACT;
err = zap_remove_norm(mos, snapobj, name, mt, tx);
if (err == ENOTSUP && mt == MT_FIRST)
err = zap_remove(mos, snapobj, name, tx);
return (err);
}
static int
dsl_dataset_get_ref(dsl_pool_t *dp, uint64_t dsobj, 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(RW_LOCK_HELD(&dp->dp_config_rwlock) ||
dsl_pool_sync_context(dp));
err = dmu_bonus_hold(mos, dsobj, tag, &dbuf);
if (err)
return (err);
/* Make sure dsobj has the correct object type. */
dmu_object_info_from_db(dbuf, &doi);
if (doi.doi_type != DMU_OT_DSL_DATASET)
return (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_phys = dbuf->db_data;
list_link_init(&ds->ds_synced_link);
mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL);
mutex_init(&ds->ds_recvlock, NULL, MUTEX_DEFAULT, NULL);
mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL);
rw_init(&ds->ds_rwlock, NULL, RW_DEFAULT, NULL);
cv_init(&ds->ds_exclusive_cv, NULL, CV_DEFAULT, NULL);
bplist_create(&ds->ds_pending_deadlist);
dsl_deadlist_open(&ds->ds_deadlist,
mos, ds->ds_phys->ds_deadlist_obj);
if (err == 0) {
err = dsl_dir_open_obj(dp,
ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir);
}
if (err) {
mutex_destroy(&ds->ds_lock);
mutex_destroy(&ds->ds_recvlock);
mutex_destroy(&ds->ds_opening_lock);
rw_destroy(&ds->ds_rwlock);
cv_destroy(&ds->ds_exclusive_cv);
bplist_destroy(&ds->ds_pending_deadlist);
dsl_deadlist_close(&ds->ds_deadlist);
kmem_free(ds, sizeof (dsl_dataset_t));
dmu_buf_rele(dbuf, tag);
return (err);
}
if (!dsl_dataset_is_snapshot(ds)) {
ds->ds_snapname[0] = '\0';
if (ds->ds_phys->ds_prev_snap_obj) {
err = dsl_dataset_get_ref(dp,
ds->ds_phys->ds_prev_snap_obj,
ds, &ds->ds_prev);
}
} else {
if (zfs_flags & ZFS_DEBUG_SNAPNAMES)
err = dsl_dataset_get_snapname(ds);
if (err == 0 && ds->ds_phys->ds_userrefs_obj != 0) {
err = zap_count(
ds->ds_dir->dd_pool->dp_meta_objset,
ds->ds_phys->ds_userrefs_obj,
&ds->ds_userrefs);
}
}
if (err == 0 && !dsl_dataset_is_snapshot(ds)) {
/*
* In sync context, we're called with either no lock
* or with the write lock. If we're not syncing,
* we're always called with the read lock held.
*/
boolean_t need_lock =
!RW_WRITE_HELD(&dp->dp_config_rwlock) &&
dsl_pool_sync_context(dp);
if (need_lock)
rw_enter(&dp->dp_config_rwlock, RW_READER);
err = dsl_prop_get_ds(ds,
"refreservation", sizeof (uint64_t), 1,
&ds->ds_reserved, NULL);
if (err == 0) {
err = dsl_prop_get_ds(ds,
"refquota", sizeof (uint64_t), 1,
&ds->ds_quota, NULL);
}
if (need_lock)
rw_exit(&dp->dp_config_rwlock);
} else {
ds->ds_reserved = ds->ds_quota = 0;
}
if (err == 0) {
winner = dmu_buf_set_user_ie(dbuf, ds, &ds->ds_phys,
dsl_dataset_evict);
}
if (err || winner) {
bplist_destroy(&ds->ds_pending_deadlist);
dsl_deadlist_close(&ds->ds_deadlist);
if (ds->ds_prev)
dsl_dataset_drop_ref(ds->ds_prev, ds);
dsl_dir_close(ds->ds_dir, ds);
mutex_destroy(&ds->ds_lock);
mutex_destroy(&ds->ds_recvlock);
mutex_destroy(&ds->ds_opening_lock);
rw_destroy(&ds->ds_rwlock);
cv_destroy(&ds->ds_exclusive_cv);
kmem_free(ds, sizeof (dsl_dataset_t));
if (err) {
dmu_buf_rele(dbuf, tag);
return (err);
}
ds = winner;
} else {
ds->ds_fsid_guid =
unique_insert(ds->ds_phys->ds_fsid_guid);
}
}
ASSERT3P(ds->ds_dbuf, ==, dbuf);
ASSERT3P(ds->ds_phys, ==, dbuf->db_data);
ASSERT(ds->ds_phys->ds_prev_snap_obj != 0 ||
spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN ||
dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap);
mutex_enter(&ds->ds_lock);
if (!dsl_pool_sync_context(dp) && DSL_DATASET_IS_DESTROYED(ds)) {
mutex_exit(&ds->ds_lock);
dmu_buf_rele(ds->ds_dbuf, tag);
return (ENOENT);
}
mutex_exit(&ds->ds_lock);
*dsp = ds;
return (0);
}
static int
dsl_dataset_hold_ref(dsl_dataset_t *ds, void *tag)
{
dsl_pool_t *dp = ds->ds_dir->dd_pool;
/*
* In syncing context we don't want the rwlock lock: there
* may be an existing writer waiting for sync phase to
* finish. We don't need to worry about such writers, since
* sync phase is single-threaded, so the writer can't be
* doing anything while we are active.
*/
if (dsl_pool_sync_context(dp)) {
ASSERT(!DSL_DATASET_IS_DESTROYED(ds));
return (0);
}
/*
* Normal users will hold the ds_rwlock as a READER until they
* are finished (i.e., call dsl_dataset_rele()). "Owners" will
* drop their READER lock after they set the ds_owner field.
*
* If the dataset is being destroyed, the destroy thread will
* obtain a WRITER lock for exclusive access after it's done its
* open-context work and then change the ds_owner to
* dsl_reaper once destruction is assured. So threads
* may block here temporarily, until the "destructability" of
* the dataset is determined.
*/
ASSERT(!RW_WRITE_HELD(&dp->dp_config_rwlock));
mutex_enter(&ds->ds_lock);
while (!rw_tryenter(&ds->ds_rwlock, RW_READER)) {
rw_exit(&dp->dp_config_rwlock);
cv_wait(&ds->ds_exclusive_cv, &ds->ds_lock);
if (DSL_DATASET_IS_DESTROYED(ds)) {
mutex_exit(&ds->ds_lock);
dsl_dataset_drop_ref(ds, tag);
rw_enter(&dp->dp_config_rwlock, RW_READER);
return (ENOENT);
}
/*
* The dp_config_rwlock lives above the ds_lock. And
* we need to check DSL_DATASET_IS_DESTROYED() while
* holding the ds_lock, so we have to drop and reacquire
* the ds_lock here.
*/
mutex_exit(&ds->ds_lock);
rw_enter(&dp->dp_config_rwlock, RW_READER);
mutex_enter(&ds->ds_lock);
}
mutex_exit(&ds->ds_lock);
return (0);
}
int
dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag,
dsl_dataset_t **dsp)
{
int err = dsl_dataset_get_ref(dp, dsobj, tag, dsp);
if (err)
return (err);
return (dsl_dataset_hold_ref(*dsp, tag));
}
int
dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, boolean_t inconsistentok,
void *tag, dsl_dataset_t **dsp)
{
int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp);
if (err)
return (err);
if (!dsl_dataset_tryown(*dsp, inconsistentok, tag)) {
dsl_dataset_rele(*dsp, tag);
*dsp = NULL;
return (EBUSY);
}
return (0);
}
int
dsl_dataset_hold(const char *name, void *tag, dsl_dataset_t **dsp)
{
dsl_dir_t *dd;
dsl_pool_t *dp;
const char *snapname;
uint64_t obj;
int err = 0;
err = dsl_dir_open_spa(NULL, name, FTAG, &dd, &snapname);
if (err)
return (err);
dp = dd->dd_pool;
obj = dd->dd_phys->dd_head_dataset_obj;
rw_enter(&dp->dp_config_rwlock, RW_READER);
if (obj)
err = dsl_dataset_get_ref(dp, obj, tag, dsp);
else
err = ENOENT;
if (err)
goto out;
err = dsl_dataset_hold_ref(*dsp, tag);
/* we may be looking for a snapshot */
if (err == 0 && snapname != NULL) {
dsl_dataset_t *ds = NULL;
if (*snapname++ != '@') {
dsl_dataset_rele(*dsp, tag);
err = ENOENT;
goto out;
}
dprintf("looking for snapshot '%s'\n", snapname);
err = dsl_dataset_snap_lookup(*dsp, snapname, &obj);
if (err == 0)
err = dsl_dataset_get_ref(dp, obj, tag, &ds);
dsl_dataset_rele(*dsp, tag);
ASSERT3U((err == 0), ==, (ds != NULL));
if (ds) {
mutex_enter(&ds->ds_lock);
if (ds->ds_snapname[0] == 0)
(void) strlcpy(ds->ds_snapname, snapname,
sizeof (ds->ds_snapname));
mutex_exit(&ds->ds_lock);
err = dsl_dataset_hold_ref(ds, tag);
*dsp = err ? NULL : ds;
}
}
out:
rw_exit(&dp->dp_config_rwlock);
dsl_dir_close(dd, FTAG);
return (err);
}
int
dsl_dataset_own(const char *name, boolean_t inconsistentok,
void *tag, dsl_dataset_t **dsp)
{
int err = dsl_dataset_hold(name, tag, dsp);
if (err)
return (err);
if (!dsl_dataset_tryown(*dsp, inconsistentok, tag)) {
dsl_dataset_rele(*dsp, tag);
return (EBUSY);
}
return (0);
}
void
dsl_dataset_name(dsl_dataset_t *ds, char *name)
{
if (ds == NULL) {
(void) strcpy(name, "mos");
} else {
dsl_dir_name(ds->ds_dir, name);
VERIFY(0 == dsl_dataset_get_snapname(ds));
if (ds->ds_snapname[0]) {
(void) strcat(name, "@");
/*
* 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);
(void) strcat(name, ds->ds_snapname);
mutex_exit(&ds->ds_lock);
} else {
(void) strcat(name, ds->ds_snapname);
}
}
}
}
static int
dsl_dataset_namelen(dsl_dataset_t *ds)
{
int result;
if (ds == NULL) {
result = 3; /* "mos" */
} else {
result = dsl_dir_namelen(ds->ds_dir);
VERIFY(0 == dsl_dataset_get_snapname(ds));
if (ds->ds_snapname[0]) {
++result; /* adding one for the @-sign */
if (!MUTEX_HELD(&ds->ds_lock)) {
mutex_enter(&ds->ds_lock);
result += strlen(ds->ds_snapname);
mutex_exit(&ds->ds_lock);
} else {
result += strlen(ds->ds_snapname);
}
}
}
return (result);
}
void
dsl_dataset_drop_ref(dsl_dataset_t *ds, void *tag)
{
dmu_buf_rele(ds->ds_dbuf, tag);
}
void
dsl_dataset_rele(dsl_dataset_t *ds, void *tag)
{
if (!dsl_pool_sync_context(ds->ds_dir->dd_pool)) {
rw_exit(&ds->ds_rwlock);
}
dsl_dataset_drop_ref(ds, tag);
}
void
dsl_dataset_disown(dsl_dataset_t *ds, void *tag)
{
ASSERT((ds->ds_owner == tag && ds->ds_dbuf) ||
(DSL_DATASET_IS_DESTROYED(ds) && ds->ds_dbuf == NULL));
mutex_enter(&ds->ds_lock);
ds->ds_owner = NULL;
if (RW_WRITE_HELD(&ds->ds_rwlock)) {
rw_exit(&ds->ds_rwlock);
cv_broadcast(&ds->ds_exclusive_cv);
}
mutex_exit(&ds->ds_lock);
if (ds->ds_dbuf)
dsl_dataset_drop_ref(ds, tag);
else
dsl_dataset_evict(NULL, ds);
}
boolean_t
dsl_dataset_tryown(dsl_dataset_t *ds, boolean_t inconsistentok, void *tag)
{
boolean_t gotit = FALSE;
mutex_enter(&ds->ds_lock);
if (ds->ds_owner == NULL &&
(!DS_IS_INCONSISTENT(ds) || inconsistentok)) {
ds->ds_owner = tag;
if (!dsl_pool_sync_context(ds->ds_dir->dd_pool))
rw_exit(&ds->ds_rwlock);
gotit = TRUE;
}
mutex_exit(&ds->ds_lock);
return (gotit);
}
void
dsl_dataset_make_exclusive(dsl_dataset_t *ds, void *owner)
{
ASSERT3P(owner, ==, ds->ds_owner);
if (!RW_WRITE_HELD(&ds->ds_rwlock))
rw_enter(&ds->ds_rwlock, RW_WRITER);
}
uint64_t
dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
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 || origin->ds_phys->ds_num_children > 0);
ASSERT(dmu_tx_is_syncing(tx));
ASSERT(dd->dd_phys->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);
VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
dmu_buf_will_dirty(dbuf, tx);
dsphys = dbuf->db_data;
bzero(dsphys, 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;
dsphys->ds_prev_snap_obj = origin->ds_object;
dsphys->ds_prev_snap_txg =
origin->ds_phys->ds_creation_txg;
dsphys->ds_used_bytes =
origin->ds_phys->ds_used_bytes;
dsphys->ds_compressed_bytes =
origin->ds_phys->ds_compressed_bytes;
dsphys->ds_uncompressed_bytes =
origin->ds_phys->ds_uncompressed_bytes;
dsphys->ds_bp = origin->ds_phys->ds_bp;
dsphys->ds_flags |= origin->ds_phys->ds_flags;
dmu_buf_will_dirty(origin->ds_dbuf, tx);
origin->ds_phys->ds_num_children++;
VERIFY3U(0, ==, dsl_dataset_hold_obj(dp,
origin->ds_dir->dd_phys->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 (origin->ds_phys->ds_next_clones_obj == 0) {
origin->ds_phys->ds_next_clones_obj =
zap_create(mos,
DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx);
}
VERIFY(0 == zap_add_int(mos,
origin->ds_phys->ds_next_clones_obj,
dsobj, tx));
}
dmu_buf_will_dirty(dd->dd_dbuf, tx);
dd->dd_phys->dd_origin_obj = origin->ds_object;
if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
if (origin->ds_dir->dd_phys->dd_clones == 0) {
dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx);
origin->ds_dir->dd_phys->dd_clones =
zap_create(mos,
DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx);
}
VERIFY3U(0, ==, zap_add_int(mos,
origin->ds_dir->dd_phys->dd_clones, dsobj, 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);
dd->dd_phys->dd_head_dataset_obj = dsobj;
return (dsobj);
}
uint64_t
dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname,
dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx)
{
dsl_pool_t *dp = pdd->dd_pool;
uint64_t dsobj, ddobj;
dsl_dir_t *dd;
ASSERT(lastname[0] != '@');
ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx);
VERIFY(0 == dsl_dir_open_obj(dp, ddobj, lastname, FTAG, &dd));
dsobj = dsl_dataset_create_sync_dd(dd, origin, flags, tx);
dsl_deleg_set_create_perms(dd, tx, cr);
dsl_dir_close(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) {
dsl_dataset_t *ds;
objset_t *os;
VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
VERIFY3U(0, ==, dmu_objset_from_ds(ds, &os));
bzero(&os->os_zil_header, sizeof (os->os_zil_header));
dsl_dataset_dirty(ds, tx);
dsl_dataset_rele(ds, FTAG);
}
return (dsobj);
}
struct destroyarg {
dsl_sync_task_group_t *dstg;
char *snapname;
char *failed;
boolean_t defer;
};
static int
dsl_snapshot_destroy_one(const char *name, void *arg)
{
struct destroyarg *da = arg;
dsl_dataset_t *ds;
int err;
char *dsname;
dsname = kmem_asprintf("%s@%s", name, da->snapname);
err = dsl_dataset_own(dsname, B_TRUE, da->dstg, &ds);
strfree(dsname);
if (err == 0) {
struct dsl_ds_destroyarg *dsda;
dsl_dataset_make_exclusive(ds, da->dstg);
dsda = kmem_zalloc(sizeof (struct dsl_ds_destroyarg), KM_SLEEP);
dsda->ds = ds;
dsda->defer = da->defer;
dsl_sync_task_create(da->dstg, dsl_dataset_destroy_check,
dsl_dataset_destroy_sync, dsda, da->dstg, 0);
} else if (err == ENOENT) {
err = 0;
} else {
(void) strcpy(da->failed, name);
}
return (err);
}
/*
* Destroy 'snapname' in all descendants of 'fsname'.
*/
#pragma weak dmu_snapshots_destroy = dsl_snapshots_destroy
int
dsl_snapshots_destroy(char *fsname, char *snapname, boolean_t defer)
{
int err;
struct destroyarg da;
dsl_sync_task_t *dst;
spa_t *spa;
err = spa_open(fsname, &spa, FTAG);
if (err)
return (err);
da.dstg = dsl_sync_task_group_create(spa_get_dsl(spa));
da.snapname = snapname;
da.failed = fsname;
da.defer = defer;
err = dmu_objset_find(fsname,
dsl_snapshot_destroy_one, &da, DS_FIND_CHILDREN);
if (err == 0)
err = dsl_sync_task_group_wait(da.dstg);
for (dst = list_head(&da.dstg->dstg_tasks); dst;
dst = list_next(&da.dstg->dstg_tasks, dst)) {
struct dsl_ds_destroyarg *dsda = dst->dst_arg1;
dsl_dataset_t *ds = dsda->ds;
/*
* Return the file system name that triggered the error
*/
if (dst->dst_err) {
dsl_dataset_name(ds, fsname);
*strchr(fsname, '@') = '\0';
}
ASSERT3P(dsda->rm_origin, ==, NULL);
dsl_dataset_disown(ds, da.dstg);
kmem_free(dsda, sizeof (struct dsl_ds_destroyarg));
}
dsl_sync_task_group_destroy(da.dstg);
spa_close(spa, FTAG);
return (err);
}
static boolean_t
dsl_dataset_might_destroy_origin(dsl_dataset_t *ds)
{
boolean_t might_destroy = B_FALSE;
mutex_enter(&ds->ds_lock);
if (ds->ds_phys->ds_num_children == 2 && ds->ds_userrefs == 0 &&
DS_IS_DEFER_DESTROY(ds))
might_destroy = B_TRUE;
mutex_exit(&ds->ds_lock);
return (might_destroy);
}
/*
* If we're removing a clone, and these three conditions are true:
* 1) the clone's origin has no other children
* 2) the clone's origin has no user references
* 3) the clone's origin has been marked for deferred destruction
* Then, prepare to remove the origin as part of this sync task group.
*/
static int
dsl_dataset_origin_rm_prep(struct dsl_ds_destroyarg *dsda, void *tag)
{
dsl_dataset_t *ds = dsda->ds;
dsl_dataset_t *origin = ds->ds_prev;
if (dsl_dataset_might_destroy_origin(origin)) {
char *name;
int namelen;
int error;
namelen = dsl_dataset_namelen(origin) + 1;
name = kmem_alloc(namelen, KM_SLEEP);
dsl_dataset_name(origin, name);
#ifdef _KERNEL
error = zfs_unmount_snap(name, NULL);
if (error) {
kmem_free(name, namelen);
return (error);
}
#endif
error = dsl_dataset_own(name, B_TRUE, tag, &origin);
kmem_free(name, namelen);
if (error)
return (error);
dsda->rm_origin = origin;
dsl_dataset_make_exclusive(origin, tag);
}
return (0);
}
/*
* ds must be opened as OWNER. On return (whether successful or not),
* ds will be closed and caller can no longer dereference it.
*/
int
dsl_dataset_destroy(dsl_dataset_t *ds, void *tag, boolean_t defer)
{
int err;
dsl_sync_task_group_t *dstg;
objset_t *os;
dsl_dir_t *dd;
uint64_t obj;
struct dsl_ds_destroyarg dsda = { 0 };
dsl_dataset_t *dummy_ds;
dsda.ds = ds;
if (dsl_dataset_is_snapshot(ds)) {
/* Destroying a snapshot is simpler */
dsl_dataset_make_exclusive(ds, tag);
dsda.defer = defer;
err = dsl_sync_task_do(ds->ds_dir->dd_pool,
dsl_dataset_destroy_check, dsl_dataset_destroy_sync,
&dsda, tag, 0);
ASSERT3P(dsda.rm_origin, ==, NULL);
goto out;
} else if (defer) {
err = EINVAL;
goto out;
}
dd = ds->ds_dir;
dummy_ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP);
dummy_ds->ds_dir = dd;
dummy_ds->ds_object = ds->ds_object;
/*
* Check for errors and mark this ds as inconsistent, in
* case we crash while freeing the objects.
*/
err = dsl_sync_task_do(dd->dd_pool, dsl_dataset_destroy_begin_check,
dsl_dataset_destroy_begin_sync, ds, NULL, 0);
if (err)
goto out_free;
err = dmu_objset_from_ds(ds, &os);
if (err)
goto out_free;
/*
* remove the objects in open context, so that we won't
* have too much to do in syncing context.
*/
for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE,
ds->ds_phys->ds_prev_snap_txg)) {
/*
* Ignore errors, if there is not enough disk space
* we will deal with it in dsl_dataset_destroy_sync().
*/
(void) dmu_free_object(os, obj);
}
if (err != ESRCH)
goto out_free;
/*
* Only the ZIL knows how to free log blocks.
*/
zil_destroy(dmu_objset_zil(os), B_FALSE);
/*
* Sync out all in-flight IO.
*/
txg_wait_synced(dd->dd_pool, 0);
/*
* If we managed to free all the objects in open
* context, the user space accounting should be zero.
*/
if (ds->ds_phys->ds_bp.blk_fill == 0 &&
dmu_objset_userused_enabled(os)) {
ASSERTV(uint64_t count);
ASSERT(zap_count(os, DMU_USERUSED_OBJECT, &count) != 0 ||
count == 0);
ASSERT(zap_count(os, DMU_GROUPUSED_OBJECT, &count) != 0 ||
count == 0);
}
rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER);
err = dsl_dir_open_obj(dd->dd_pool, dd->dd_object, NULL, FTAG, &dd);
rw_exit(&dd->dd_pool->dp_config_rwlock);
if (err)
goto out_free;
/*
* Blow away the dsl_dir + head dataset.
*/
dsl_dataset_make_exclusive(ds, tag);
/*
* If we're removing a clone, we might also need to remove its
* origin.
*/
do {
dsda.need_prep = B_FALSE;
if (dsl_dir_is_clone(dd)) {
err = dsl_dataset_origin_rm_prep(&dsda, tag);
if (err) {
dsl_dir_close(dd, FTAG);
goto out_free;
}
}
dstg = dsl_sync_task_group_create(ds->ds_dir->dd_pool);
dsl_sync_task_create(dstg, dsl_dataset_destroy_check,
dsl_dataset_destroy_sync, &dsda, tag, 0);
dsl_sync_task_create(dstg, dsl_dir_destroy_check,
dsl_dir_destroy_sync, dummy_ds, FTAG, 0);
err = dsl_sync_task_group_wait(dstg);
dsl_sync_task_group_destroy(dstg);
/*
* We could be racing against 'zfs release' or 'zfs destroy -d'
* on the origin snap, in which case we can get EBUSY if we
* needed to destroy the origin snap but were not ready to
* do so.
*/
if (dsda.need_prep) {
ASSERT(err == EBUSY);
ASSERT(dsl_dir_is_clone(dd));
ASSERT(dsda.rm_origin == NULL);
}
} while (dsda.need_prep);
if (dsda.rm_origin != NULL)
dsl_dataset_disown(dsda.rm_origin, tag);
/* if it is successful, dsl_dir_destroy_sync will close the dd */
if (err)
dsl_dir_close(dd, FTAG);
out_free:
kmem_free(dummy_ds, sizeof (dsl_dataset_t));
out:
dsl_dataset_disown(ds, tag);
return (err);
}
blkptr_t *
dsl_dataset_get_blkptr(dsl_dataset_t *ds)
{
return (&ds->ds_phys->ds_bp);
}
void
dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx)
{
ASSERT(dmu_tx_is_syncing(tx));
/* If it's the meta-objset, set dp_meta_rootbp */
if (ds == NULL) {
tx->tx_pool->dp_meta_rootbp = *bp;
} else {
dmu_buf_will_dirty(ds->ds_dbuf, tx);
ds->ds_phys->ds_bp = *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 (ds->ds_phys->ds_next_snap_obj != 0)
panic("dirtying snapshot!");
dp = ds->ds_dir->dd_pool;
if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg) == 0) {
/* up the hold count until we can be written out */
dmu_buf_add_ref(ds->ds_dbuf, ds);
}
}
/*
* 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.
*/
static void
dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds)
{
uint64_t mrs_used;
uint64_t dlused, dlcomp, dluncomp;
ASSERT(!dsl_dataset_is_snapshot(ds));
if (ds->ds_phys->ds_prev_snap_obj != 0)
mrs_used = ds->ds_prev->ds_phys->ds_used_bytes;
else
mrs_used = 0;
dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp);
ASSERT3U(dlused, <=, mrs_used);
ds->ds_phys->ds_unique_bytes =
ds->ds_phys->ds_used_bytes - (mrs_used - dlused);
if (spa_version(ds->ds_dir->dd_pool->dp_spa) >=
SPA_VERSION_UNIQUE_ACCURATE)
ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
}
struct killarg {
dsl_dataset_t *ds;
dmu_tx_t *tx;
};
/* ARGSUSED */
static int
kill_blkptr(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, arc_buf_t *pbuf,
const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
{
struct killarg *ka = arg;
dmu_tx_t *tx = ka->tx;
if (bp == NULL)
return (0);
if (zb->zb_level == ZB_ZIL_LEVEL) {
ASSERT(zilog != NULL);
/*
* It's a block in the intent log. It has no
* accounting, so just free it.
*/
dsl_free(ka->tx->tx_pool, ka->tx->tx_txg, bp);
} else {
ASSERT(zilog == NULL);
ASSERT3U(bp->blk_birth, >, ka->ds->ds_phys->ds_prev_snap_txg);
(void) dsl_dataset_block_kill(ka->ds, bp, tx, B_FALSE);
}
return (0);
}
/* ARGSUSED */
static int
dsl_dataset_destroy_begin_check(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
uint64_t count;
int err;
/*
* Can't delete a head dataset if there are snapshots of it.
* (Except if the only snapshots are from the branch we cloned
* from.)
*/
if (ds->ds_prev != NULL &&
ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object)
return (EBUSY);
/*
* This is really a dsl_dir thing, but check it here so that
* we'll be less likely to leave this dataset inconsistent &
* nearly destroyed.
*/
err = zap_count(mos, ds->ds_dir->dd_phys->dd_child_dir_zapobj, &count);
if (err)
return (err);
if (count != 0)
return (EEXIST);
return (0);
}
/* ARGSUSED */
static void
dsl_dataset_destroy_begin_sync(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
dsl_pool_t *dp = ds->ds_dir->dd_pool;
/* Mark it as inconsistent on-disk, in case we crash */
dmu_buf_will_dirty(ds->ds_dbuf, tx);
ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT;
spa_history_log_internal(LOG_DS_DESTROY_BEGIN, dp->dp_spa, tx,
"dataset = %llu", ds->ds_object);
}
static int
dsl_dataset_origin_check(struct dsl_ds_destroyarg *dsda, void *tag,
dmu_tx_t *tx)
{
dsl_dataset_t *ds = dsda->ds;
dsl_dataset_t *ds_prev = ds->ds_prev;
if (dsl_dataset_might_destroy_origin(ds_prev)) {
struct dsl_ds_destroyarg ndsda = {0};
/*
* If we're not prepared to remove the origin, don't remove
* the clone either.
*/
if (dsda->rm_origin == NULL) {
dsda->need_prep = B_TRUE;
return (EBUSY);
}
ndsda.ds = ds_prev;
ndsda.is_origin_rm = B_TRUE;
return (dsl_dataset_destroy_check(&ndsda, tag, tx));
}
/*
* If we're not going to remove the origin after all,
* undo the open context setup.
*/
if (dsda->rm_origin != NULL) {
dsl_dataset_disown(dsda->rm_origin, tag);
dsda->rm_origin = NULL;
}
return (0);
}
/*
* If you add new checks here, you may need to add
* additional checks to the "temporary" case in
* snapshot_check() in dmu_objset.c.
*/
/* ARGSUSED */
int
dsl_dataset_destroy_check(void *arg1, void *arg2, dmu_tx_t *tx)
{
struct dsl_ds_destroyarg *dsda = arg1;
dsl_dataset_t *ds = dsda->ds;
/* we have an owner hold, so noone else can destroy us */
ASSERT(!DSL_DATASET_IS_DESTROYED(ds));
/*
* Only allow deferred destroy on pools that support it.
* NOTE: deferred destroy is only supported on snapshots.
*/
if (dsda->defer) {
if (spa_version(ds->ds_dir->dd_pool->dp_spa) <
SPA_VERSION_USERREFS)
return (ENOTSUP);
ASSERT(dsl_dataset_is_snapshot(ds));
return (0);
}
/*
* Can't delete a head dataset if there are snapshots of it.
* (Except if the only snapshots are from the branch we cloned
* from.)
*/
if (ds->ds_prev != NULL &&
ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object)
return (EBUSY);
/*
* If we made changes this txg, traverse_dsl_dataset won't find
* them. Try again.
*/
if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg)
return (EAGAIN);
if (dsl_dataset_is_snapshot(ds)) {
/*
* If this snapshot has an elevated user reference count,
* we can't destroy it yet.
*/
if (ds->ds_userrefs > 0 && !dsda->releasing)
return (EBUSY);
mutex_enter(&ds->ds_lock);
/*
* Can't delete a branch point. However, if we're destroying
* a clone and removing its origin due to it having a user
* hold count of 0 and having been marked for deferred destroy,
* it's OK for the origin to have a single clone.
*/
if (ds->ds_phys->ds_num_children >
(dsda->is_origin_rm ? 2 : 1)) {
mutex_exit(&ds->ds_lock);
return (EEXIST);
}
mutex_exit(&ds->ds_lock);
} else if (dsl_dir_is_clone(ds->ds_dir)) {
return (dsl_dataset_origin_check(dsda, arg2, tx));
}
/* XXX we should do some i/o error checking... */
return (0);
}
struct refsarg {
kmutex_t lock;
boolean_t gone;
kcondvar_t cv;
};
/* ARGSUSED */
static void
dsl_dataset_refs_gone(dmu_buf_t *db, void *argv)
{
struct refsarg *arg = argv;
mutex_enter(&arg->lock);
arg->gone = TRUE;
cv_signal(&arg->cv);
mutex_exit(&arg->lock);
}
static void
dsl_dataset_drain_refs(dsl_dataset_t *ds, void *tag)
{
struct refsarg arg;
mutex_init(&arg.lock, NULL, MUTEX_DEFAULT, NULL);
cv_init(&arg.cv, NULL, CV_DEFAULT, NULL);
arg.gone = FALSE;
(void) dmu_buf_update_user(ds->ds_dbuf, ds, &arg, &ds->ds_phys,
dsl_dataset_refs_gone);
dmu_buf_rele(ds->ds_dbuf, tag);
mutex_enter(&arg.lock);
while (!arg.gone)
cv_wait(&arg.cv, &arg.lock);
ASSERT(arg.gone);
mutex_exit(&arg.lock);
ds->ds_dbuf = NULL;
ds->ds_phys = NULL;
mutex_destroy(&arg.lock);
cv_destroy(&arg.cv);
}
static void
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;
int err;
ASSERTV(uint64_t count);
ASSERT(ds->ds_phys->ds_num_children >= 2);
err = zap_remove_int(mos, ds->ds_phys->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) {
VERIFY3U(err, ==, 0);
}
ASSERT3U(0, ==, zap_count(mos, ds->ds_phys->ds_next_clones_obj,
&count));
ASSERT3U(count, <=, ds->ds_phys->ds_num_children - 2);
}
static void
dsl_dataset_remove_clones_key(dsl_dataset_t *ds, uint64_t mintxg, dmu_tx_t *tx)
{
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
zap_cursor_t zc;
zap_attribute_t za;
/*
* If it is the old version, dd_clones doesn't exist so we can't
* find the clones, but deadlist_remove_key() is a no-op so it
* doesn't matter.
*/
if (ds->ds_dir->dd_phys->dd_clones == 0)
return;
for (zap_cursor_init(&zc, mos, ds->ds_dir->dd_phys->dd_clones);
zap_cursor_retrieve(&zc, &za) == 0;
zap_cursor_advance(&zc)) {
dsl_dataset_t *clone;
VERIFY3U(0, ==, dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
za.za_first_integer, FTAG, &clone));
if (clone->ds_dir->dd_origin_txg > mintxg) {
dsl_deadlist_remove_key(&clone->ds_deadlist,
mintxg, tx);
dsl_dataset_remove_clones_key(clone, mintxg, tx);
}
dsl_dataset_rele(clone, FTAG);
}
zap_cursor_fini(&zc);
}
struct process_old_arg {
dsl_dataset_t *ds;
dsl_dataset_t *ds_prev;
boolean_t after_branch_point;
zio_t *pio;
uint64_t used, comp, uncomp;
};
static int
process_old_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
{
struct process_old_arg *poa = arg;
dsl_pool_t *dp = poa->ds->ds_dir->dd_pool;
if (bp->blk_birth <= poa->ds->ds_phys->ds_prev_snap_txg) {
dsl_deadlist_insert(&poa->ds->ds_deadlist, bp, tx);
if (poa->ds_prev && !poa->after_branch_point &&
bp->blk_birth >
poa->ds_prev->ds_phys->ds_prev_snap_txg) {
poa->ds_prev->ds_phys->ds_unique_bytes +=
bp_get_dsize_sync(dp->dp_spa, bp);
}
} else {
poa->used += bp_get_dsize_sync(dp->dp_spa, bp);
poa->comp += BP_GET_PSIZE(bp);
poa->uncomp += BP_GET_UCSIZE(bp);
dsl_free_sync(poa->pio, dp, tx->tx_txg, bp);
}
return (0);
}
static void
process_old_deadlist(dsl_dataset_t *ds, dsl_dataset_t *ds_prev,
dsl_dataset_t *ds_next, boolean_t after_branch_point, dmu_tx_t *tx)
{
struct process_old_arg poa = { 0 };
dsl_pool_t *dp = ds->ds_dir->dd_pool;
objset_t *mos = dp->dp_meta_objset;
ASSERT(ds->ds_deadlist.dl_oldfmt);
ASSERT(ds_next->ds_deadlist.dl_oldfmt);
poa.ds = ds;
poa.ds_prev = ds_prev;
poa.after_branch_point = after_branch_point;
poa.pio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
VERIFY3U(0, ==, bpobj_iterate(&ds_next->ds_deadlist.dl_bpobj,
process_old_cb, &poa, tx));
VERIFY3U(zio_wait(poa.pio), ==, 0);
ASSERT3U(poa.used, ==, ds->ds_phys->ds_unique_bytes);
/* change snapused */
dsl_dir_diduse_space(ds->ds_dir, DD_USED_SNAP,
-poa.used, -poa.comp, -poa.uncomp, tx);
/* swap next's deadlist to our deadlist */
dsl_deadlist_close(&ds->ds_deadlist);
dsl_deadlist_close(&ds_next->ds_deadlist);
SWITCH64(ds_next->ds_phys->ds_deadlist_obj,
ds->ds_phys->ds_deadlist_obj);
dsl_deadlist_open(&ds->ds_deadlist, mos, ds->ds_phys->ds_deadlist_obj);
dsl_deadlist_open(&ds_next->ds_deadlist, mos,
ds_next->ds_phys->ds_deadlist_obj);
}
void
dsl_dataset_destroy_sync(void *arg1, void *tag, dmu_tx_t *tx)
{
struct dsl_ds_destroyarg *dsda = arg1;
dsl_dataset_t *ds = dsda->ds;
int err;
int after_branch_point = FALSE;
dsl_pool_t *dp = ds->ds_dir->dd_pool;
objset_t *mos = dp->dp_meta_objset;
dsl_dataset_t *ds_prev = NULL;
boolean_t wont_destroy;
uint64_t obj;
wont_destroy = (dsda->defer &&
(ds->ds_userrefs > 0 || ds->ds_phys->ds_num_children > 1));
ASSERT(ds->ds_owner || wont_destroy);
ASSERT(dsda->defer || ds->ds_phys->ds_num_children <= 1);
ASSERT(ds->ds_prev == NULL ||
ds->ds_prev->ds_phys->ds_next_snap_obj != ds->ds_object);
ASSERT3U(ds->ds_phys->ds_bp.blk_birth, <=, tx->tx_txg);
if (wont_destroy) {
ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS);
dmu_buf_will_dirty(ds->ds_dbuf, tx);
ds->ds_phys->ds_flags |= DS_FLAG_DEFER_DESTROY;
return;
}
/* signal any waiters that this dataset is going away */
mutex_enter(&ds->ds_lock);
ds->ds_owner = dsl_reaper;
cv_broadcast(&ds->ds_exclusive_cv);
mutex_exit(&ds->ds_lock);
/* Remove our reservation */
if (ds->ds_reserved != 0) {
dsl_prop_setarg_t psa;
uint64_t value = 0;
dsl_prop_setarg_init_uint64(&psa, "refreservation",
(ZPROP_SRC_NONE | ZPROP_SRC_LOCAL | ZPROP_SRC_RECEIVED),
&value);
psa.psa_effective_value = 0; /* predict default value */
dsl_dataset_set_reservation_sync(ds, &psa, tx);
ASSERT3U(ds->ds_reserved, ==, 0);
}
ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock));
dsl_scan_ds_destroyed(ds, tx);
obj = ds->ds_object;
if (ds->ds_phys->ds_prev_snap_obj != 0) {
if (ds->ds_prev) {
ds_prev = ds->ds_prev;
} else {
VERIFY(0 == dsl_dataset_hold_obj(dp,
ds->ds_phys->ds_prev_snap_obj, FTAG, &ds_prev));
}
after_branch_point =
(ds_prev->ds_phys->ds_next_snap_obj != obj);
dmu_buf_will_dirty(ds_prev->ds_dbuf, tx);
if (after_branch_point &&
ds_prev->ds_phys->ds_next_clones_obj != 0) {
remove_from_next_clones(ds_prev, obj, tx);
if (ds->ds_phys->ds_next_snap_obj != 0) {
VERIFY(0 == zap_add_int(mos,
ds_prev->ds_phys->ds_next_clones_obj,
ds->ds_phys->ds_next_snap_obj, tx));
}
}
if (after_branch_point &&
ds->ds_phys->ds_next_snap_obj == 0) {
/* This clone is toast. */
ASSERT(ds_prev->ds_phys->ds_num_children > 1);
ds_prev->ds_phys->ds_num_children--;
/*
* If the clone's origin has no other clones, no
* user holds, and has been marked for deferred
* deletion, then we should have done the necessary
* destroy setup for it.
*/
if (ds_prev->ds_phys->ds_num_children == 1 &&
ds_prev->ds_userrefs == 0 &&
DS_IS_DEFER_DESTROY(ds_prev)) {
ASSERT3P(dsda->rm_origin, !=, NULL);
} else {
ASSERT3P(dsda->rm_origin, ==, NULL);
}
} else if (!after_branch_point) {
ds_prev->ds_phys->ds_next_snap_obj =
ds->ds_phys->ds_next_snap_obj;
}
}
if (dsl_dataset_is_snapshot(ds)) {
dsl_dataset_t *ds_next;
uint64_t old_unique;
uint64_t used = 0, comp = 0, uncomp = 0;
VERIFY(0 == dsl_dataset_hold_obj(dp,
ds->ds_phys->ds_next_snap_obj, FTAG, &ds_next));
ASSERT3U(ds_next->ds_phys->ds_prev_snap_obj, ==, obj);
old_unique = ds_next->ds_phys->ds_unique_bytes;
dmu_buf_will_dirty(ds_next->ds_dbuf, tx);
ds_next->ds_phys->ds_prev_snap_obj =
ds->ds_phys->ds_prev_snap_obj;
ds_next->ds_phys->ds_prev_snap_txg =
ds->ds_phys->ds_prev_snap_txg;
ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==,
ds_prev ? ds_prev->ds_phys->ds_creation_txg : 0);
if (ds_next->ds_deadlist.dl_oldfmt) {
process_old_deadlist(ds, ds_prev, ds_next,
after_branch_point, tx);
} else {
/* Adjust prev's unique space. */
if (ds_prev && !after_branch_point) {
dsl_deadlist_space_range(&ds_next->ds_deadlist,
ds_prev->ds_phys->ds_prev_snap_txg,
ds->ds_phys->ds_prev_snap_txg,
&used, &comp, &uncomp);
ds_prev->ds_phys->ds_unique_bytes += used;
}
/* Adjust snapused. */
dsl_deadlist_space_range(&ds_next->ds_deadlist,
ds->ds_phys->ds_prev_snap_txg, UINT64_MAX,
&used, &comp, &uncomp);
dsl_dir_diduse_space(ds->ds_dir, DD_USED_SNAP,
-used, -comp, -uncomp, tx);
/* Move blocks to be freed to pool's free list. */
dsl_deadlist_move_bpobj(&ds_next->ds_deadlist,
&dp->dp_free_bpobj, ds->ds_phys->ds_prev_snap_txg,
tx);
dsl_dir_diduse_space(tx->tx_pool->dp_free_dir,
DD_USED_HEAD, used, comp, uncomp, tx);
dsl_dir_dirty(tx->tx_pool->dp_free_dir, tx);
/* Merge our deadlist into next's and free it. */
dsl_deadlist_merge(&ds_next->ds_deadlist,
ds->ds_phys->ds_deadlist_obj, tx);
}
dsl_deadlist_close(&ds->ds_deadlist);
dsl_deadlist_free(mos, ds->ds_phys->ds_deadlist_obj, tx);
/* Collapse range in clone heads */
dsl_dataset_remove_clones_key(ds,
ds->ds_phys->ds_creation_txg, tx);
if (dsl_dataset_is_snapshot(ds_next)) {
dsl_dataset_t *ds_nextnext;
dsl_dataset_t *hds;
/*
* Update next's unique to include blocks which
* were previously shared by only this snapshot
* and it. Those blocks will be born after the
* prev snap and before this snap, and will have
* died after the next snap and before the one
* after that (ie. be on the snap after next's
* deadlist).
*/
VERIFY(0 == dsl_dataset_hold_obj(dp,
ds_next->ds_phys->ds_next_snap_obj,
FTAG, &ds_nextnext));
dsl_deadlist_space_range(&ds_nextnext->ds_deadlist,
ds->ds_phys->ds_prev_snap_txg,
ds->ds_phys->ds_creation_txg,
&used, &comp, &uncomp);
ds_next->ds_phys->ds_unique_bytes += used;
dsl_dataset_rele(ds_nextnext, FTAG);
ASSERT3P(ds_next->ds_prev, ==, NULL);
/* Collapse range in this head. */
VERIFY3U(0, ==, dsl_dataset_hold_obj(dp,
ds->ds_dir->dd_phys->dd_head_dataset_obj,
FTAG, &hds));
dsl_deadlist_remove_key(&hds->ds_deadlist,
ds->ds_phys->ds_creation_txg, tx);
dsl_dataset_rele(hds, FTAG);
} else {
ASSERT3P(ds_next->ds_prev, ==, ds);
dsl_dataset_drop_ref(ds_next->ds_prev, ds_next);
ds_next->ds_prev = NULL;
if (ds_prev) {
VERIFY(0 == dsl_dataset_get_ref(dp,
ds->ds_phys->ds_prev_snap_obj,
ds_next, &ds_next->ds_prev));
}
dsl_dataset_recalc_head_uniq(ds_next);
/*
* Reduce the amount of our unconsmed refreservation
* being charged to our parent by the amount of
* new unique data we have gained.
*/
if (old_unique < ds_next->ds_reserved) {
int64_t mrsdelta;
uint64_t new_unique =
ds_next->ds_phys->ds_unique_bytes;
ASSERT(old_unique <= new_unique);
mrsdelta = MIN(new_unique - old_unique,
ds_next->ds_reserved - old_unique);
dsl_dir_diduse_space(ds->ds_dir,
DD_USED_REFRSRV, -mrsdelta, 0, 0, tx);
}
}
dsl_dataset_rele(ds_next, FTAG);
} else {
/*
* There's no next snapshot, so this is a head dataset.
* Destroy the deadlist. Unless it's a clone, the
* deadlist should be empty. (If it's a clone, it's
* safe to ignore the deadlist contents.)
*/
struct killarg ka;
dsl_deadlist_close(&ds->ds_deadlist);
dsl_deadlist_free(mos, ds->ds_phys->ds_deadlist_obj, tx);
ds->ds_phys->ds_deadlist_obj = 0;
/*
* Free everything that we point to (that's born after
* the previous snapshot, if we are a clone)
*
* NB: this should be very quick, because we already
* freed all the objects in open context.
*/
ka.ds = ds;
ka.tx = tx;
err = traverse_dataset(ds, ds->ds_phys->ds_prev_snap_txg,
TRAVERSE_POST, kill_blkptr, &ka);
ASSERT3U(err, ==, 0);
ASSERT(!DS_UNIQUE_IS_ACCURATE(ds) ||
ds->ds_phys->ds_unique_bytes == 0);
if (ds->ds_prev != NULL) {
if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
VERIFY3U(0, ==, zap_remove_int(mos,
ds->ds_prev->ds_dir->dd_phys->dd_clones,
ds->ds_object, tx));
}
dsl_dataset_rele(ds->ds_prev, ds);
ds->ds_prev = ds_prev = NULL;
}
}
/*
* This must be done after the dsl_traverse(), because it will
* re-open the objset.
*/
if (ds->ds_objset) {
dmu_objset_evict(ds->ds_objset);
ds->ds_objset = NULL;
}
if (ds->ds_dir->dd_phys->dd_head_dataset_obj == ds->ds_object) {
/* Erase the link in the dir */
dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx);
ds->ds_dir->dd_phys->dd_head_dataset_obj = 0;
ASSERT(ds->ds_phys->ds_snapnames_zapobj != 0);
err = zap_destroy(mos, ds->ds_phys->ds_snapnames_zapobj, tx);
ASSERT(err == 0);
} else {
/* remove from snapshot namespace */
dsl_dataset_t *ds_head;
ASSERT(ds->ds_phys->ds_snapnames_zapobj == 0);
VERIFY(0 == dsl_dataset_hold_obj(dp,
ds->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &ds_head));
VERIFY(0 == dsl_dataset_get_snapname(ds));
#ifdef ZFS_DEBUG
{
uint64_t val;
err = dsl_dataset_snap_lookup(ds_head,
ds->ds_snapname, &val);
ASSERT3U(err, ==, 0);
ASSERT3U(val, ==, obj);
}
#endif
err = dsl_dataset_snap_remove(ds_head, ds->ds_snapname, tx);
ASSERT(err == 0);
dsl_dataset_rele(ds_head, FTAG);
}
if (ds_prev && ds->ds_prev != ds_prev)
dsl_dataset_rele(ds_prev, FTAG);
spa_prop_clear_bootfs(dp->dp_spa, ds->ds_object, tx);
spa_history_log_internal(LOG_DS_DESTROY, dp->dp_spa, tx,
"dataset = %llu", ds->ds_object);
if (ds->ds_phys->ds_next_clones_obj != 0) {
ASSERTV(uint64_t count);
ASSERT(0 == zap_count(mos,
ds->ds_phys->ds_next_clones_obj, &count) && count == 0);
VERIFY(0 == dmu_object_free(mos,
ds->ds_phys->ds_next_clones_obj, tx));
}
if (ds->ds_phys->ds_props_obj != 0)
VERIFY(0 == zap_destroy(mos, ds->ds_phys->ds_props_obj, tx));
if (ds->ds_phys->ds_userrefs_obj != 0)
VERIFY(0 == zap_destroy(mos, ds->ds_phys->ds_userrefs_obj, tx));
dsl_dir_close(ds->ds_dir, ds);
ds->ds_dir = NULL;
dsl_dataset_drain_refs(ds, tag);
VERIFY(0 == dmu_object_free(mos, obj, tx));
if (dsda->rm_origin) {
/*
* Remove the origin of the clone we just destroyed.
*/
struct dsl_ds_destroyarg ndsda = {0};
ndsda.ds = dsda->rm_origin;
dsl_dataset_destroy_sync(&ndsda, tag, tx);
}
}
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(ds->ds_phys->ds_unique_bytes, ds->ds_reserved);
if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE))
return (ENOSPC);
/*
* Propogate 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(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
const char *snapname = arg2;
int err;
uint64_t value;
/*
* We don't allow multiple snapshots of the same txg. If there
* is already one, try again.
*/
if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg)
return (EAGAIN);
/*
* Check for conflicting name snapshot name.
*/
err = dsl_dataset_snap_lookup(ds, snapname, &value);
if (err == 0)
return (EEXIST);
if (err != ENOENT)
return (err);
/*
* Check that the dataset's name is not too long. Name consists
* of the dataset's length + 1 for the @-sign + snapshot name's length
*/
if (dsl_dataset_namelen(ds) + 1 + strlen(snapname) >= MAXNAMELEN)
return (ENAMETOOLONG);
err = dsl_dataset_snapshot_reserve_space(ds, tx);
if (err)
return (err);
ds->ds_trysnap_txg = tx->tx_txg;
return (0);
}
void
dsl_dataset_snapshot_sync(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
const char *snapname = arg2;
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;
int err;
ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock));
/*
* 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);
VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
dmu_buf_will_dirty(dbuf, tx);
dsphys = dbuf->db_data;
bzero(dsphys, 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 = ds->ds_phys->ds_prev_snap_obj;
dsphys->ds_prev_snap_txg = ds->ds_phys->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 = ds->ds_phys->ds_deadlist_obj;
dsphys->ds_used_bytes = ds->ds_phys->ds_used_bytes;
dsphys->ds_compressed_bytes = ds->ds_phys->ds_compressed_bytes;
dsphys->ds_uncompressed_bytes = ds->ds_phys->ds_uncompressed_bytes;
dsphys->ds_flags = ds->ds_phys->ds_flags;
dsphys->ds_bp = ds->ds_phys->ds_bp;
dmu_buf_rele(dbuf, FTAG);
ASSERT3U(ds->ds_prev != 0, ==, ds->ds_phys->ds_prev_snap_obj != 0);
if (ds->ds_prev) {
uint64_t next_clones_obj =
ds->ds_prev->ds_phys->ds_next_clones_obj;
ASSERT(ds->ds_prev->ds_phys->ds_next_snap_obj ==
ds->ds_object ||
ds->ds_prev->ds_phys->ds_num_children > 1);
if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) {
dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==,
ds->ds_prev->ds_phys->ds_creation_txg);
ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj;
} else if (next_clones_obj != 0) {
remove_from_next_clones(ds->ds_prev,
dsphys->ds_next_snap_obj, tx);
VERIFY3U(0, ==, 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(ds->ds_phys->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);
zfs_dbgmsg("taking snapshot %s@%s/%llu; newkey=%llu",
ds->ds_dir->dd_myname, snapname, dsobj,
ds->ds_phys->ds_prev_snap_txg);
ds->ds_phys->ds_deadlist_obj = dsl_deadlist_clone(&ds->ds_deadlist,
UINT64_MAX, ds->ds_phys->ds_prev_snap_obj, tx);
dsl_deadlist_close(&ds->ds_deadlist);
dsl_deadlist_open(&ds->ds_deadlist, mos, ds->ds_phys->ds_deadlist_obj);
dsl_deadlist_add_key(&ds->ds_deadlist,
ds->ds_phys->ds_prev_snap_txg, tx);
ASSERT3U(ds->ds_phys->ds_prev_snap_txg, <, tx->tx_txg);
ds->ds_phys->ds_prev_snap_obj = dsobj;
ds->ds_phys->ds_prev_snap_txg = crtxg;
ds->ds_phys->ds_unique_bytes = 0;
if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
err = zap_add(mos, ds->ds_phys->ds_snapnames_zapobj,
snapname, 8, 1, &dsobj, tx);
ASSERT(err == 0);
if (ds->ds_prev)
dsl_dataset_drop_ref(ds->ds_prev, ds);
VERIFY(0 == dsl_dataset_get_ref(dp,
ds->ds_phys->ds_prev_snap_obj, ds, &ds->ds_prev));
dsl_scan_ds_snapshotted(ds, tx);
dsl_dir_snap_cmtime_update(ds->ds_dir);
spa_history_log_internal(LOG_DS_SNAPSHOT, dp->dp_spa, tx,
"dataset = %llu", dsobj);
}
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(ds->ds_phys->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);
ds->ds_phys->ds_fsid_guid = ds->ds_fsid_guid;
dsl_dir_dirty(ds->ds_dir, tx);
dmu_objset_sync(ds->ds_objset, zio, tx);
}
void
dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv)
{
uint64_t refd, avail, uobjs, aobjs;
dsl_dir_stats(ds->ds_dir, nv);
dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION,
ds->ds_phys->ds_creation_time);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG,
ds->ds_phys->ds_creation_txg);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA,
ds->ds_quota);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION,
ds->ds_reserved);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID,
ds->ds_phys->ds_guid);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE,
ds->ds_phys->ds_unique_bytes);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID,
ds->ds_object);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS,
ds->ds_userrefs);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY,
DS_IS_DEFER_DESTROY(ds) ? 1 : 0);
if (ds->ds_phys->ds_next_snap_obj) {
/*
* This is a snapshot; override the dd's space used with
* our unique space and compression ratio.
*/
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
ds->ds_phys->ds_unique_bytes);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO,
ds->ds_phys->ds_compressed_bytes == 0 ? 100 :
(ds->ds_phys->ds_uncompressed_bytes * 100 /
ds->ds_phys->ds_compressed_bytes));
}
}
void
dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat)
{
stat->dds_creation_txg = ds->ds_phys->ds_creation_txg;
stat->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT;
stat->dds_guid = ds->ds_phys->ds_guid;
if (ds->ds_phys->ds_next_snap_obj) {
stat->dds_is_snapshot = B_TRUE;
stat->dds_num_clones = ds->ds_phys->ds_num_children - 1;
} else {
stat->dds_is_snapshot = B_FALSE;
stat->dds_num_clones = 0;
}
/* clone origin is really a dsl_dir thing... */
rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER);
if (dsl_dir_is_clone(ds->ds_dir)) {
dsl_dataset_t *ods;
VERIFY(0 == dsl_dataset_get_ref(ds->ds_dir->dd_pool,
ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &ods));
dsl_dataset_name(ods, stat->dds_origin);
dsl_dataset_drop_ref(ods, FTAG);
} else {
stat->dds_origin[0] = '\0';
}
rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock);
}
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 = ds->ds_phys->ds_used_bytes;
*availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE);
if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes)
*availbytesp += ds->ds_reserved - ds->ds_phys->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;
}
*usedobjsp = ds->ds_phys->ds_bp.blk_fill;
*availobjsp = DN_MAX_OBJECT - *usedobjsp;
}
boolean_t
dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds)
{
ASSERTV(dsl_pool_t *dp = ds->ds_dir->dd_pool);
ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) ||
dsl_pool_sync_context(dp));
if (ds->ds_prev == NULL)
return (B_FALSE);
if (ds->ds_phys->ds_bp.blk_birth >
ds->ds_prev->ds_phys->ds_creation_txg) {
objset_t *os, *os_prev;
/*
* 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(ds->ds_prev, &os_prev) != 0)
return (B_TRUE);
return (bcmp(&os->os_phys->os_meta_dnode,
&os_prev->os_phys->os_meta_dnode,
sizeof (os->os_phys->os_meta_dnode)) != 0);
}
return (B_FALSE);
}
/* ARGSUSED */
static int
dsl_dataset_snapshot_rename_check(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
char *newsnapname = arg2;
dsl_dir_t *dd = ds->ds_dir;
dsl_dataset_t *hds;
uint64_t val;
int err;
err = dsl_dataset_hold_obj(dd->dd_pool,
dd->dd_phys->dd_head_dataset_obj, FTAG, &hds);
if (err)
return (err);
/* new name better not be in use */
err = dsl_dataset_snap_lookup(hds, newsnapname, &val);
dsl_dataset_rele(hds, FTAG);
if (err == 0)
err = EEXIST;
else if (err == ENOENT)
err = 0;
/* dataset name + 1 for the "@" + the new snapshot name must fit */
if (dsl_dir_namelen(ds->ds_dir) + 1 + strlen(newsnapname) >= MAXNAMELEN)
err = ENAMETOOLONG;
return (err);
}
static void
dsl_dataset_snapshot_rename_sync(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
const char *newsnapname = arg2;
dsl_dir_t *dd = ds->ds_dir;
objset_t *mos = dd->dd_pool->dp_meta_objset;
dsl_dataset_t *hds;
int err;
ASSERT(ds->ds_phys->ds_next_snap_obj != 0);
VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool,
dd->dd_phys->dd_head_dataset_obj, FTAG, &hds));
VERIFY(0 == dsl_dataset_get_snapname(ds));
err = dsl_dataset_snap_remove(hds, ds->ds_snapname, tx);
ASSERT3U(err, ==, 0);
mutex_enter(&ds->ds_lock);
(void) strcpy(ds->ds_snapname, newsnapname);
mutex_exit(&ds->ds_lock);
err = zap_add(mos, hds->ds_phys->ds_snapnames_zapobj,
ds->ds_snapname, 8, 1, &ds->ds_object, tx);
ASSERT3U(err, ==, 0);
spa_history_log_internal(LOG_DS_RENAME, dd->dd_pool->dp_spa, tx,
"dataset = %llu", ds->ds_object);
dsl_dataset_rele(hds, FTAG);
}
struct renamesnaparg {
dsl_sync_task_group_t *dstg;
char failed[MAXPATHLEN];
char *oldsnap;
char *newsnap;
};
static int
dsl_snapshot_rename_one(const char *name, void *arg)
{
struct renamesnaparg *ra = arg;
dsl_dataset_t *ds = NULL;
char *snapname;
int err;
snapname = kmem_asprintf("%s@%s", name, ra->oldsnap);
(void) strlcpy(ra->failed, snapname, sizeof (ra->failed));
/*
* For recursive snapshot renames the parent won't be changing
* so we just pass name for both the to/from argument.
*/
err = zfs_secpolicy_rename_perms(snapname, snapname, CRED());
if (err != 0) {
strfree(snapname);
return (err == ENOENT ? 0 : err);
}
/* XXX: Ignore for SPL version until mounting the FS is supported */
#if defined(_KERNEL) && !defined(HAVE_SPL)
/*
* For all filesystems undergoing rename, we'll need to unmount it.
*/
(void) zfs_unmount_snap(snapname, NULL);
#endif
err = dsl_dataset_hold(snapname, ra->dstg, &ds);
strfree(snapname);
if (err != 0)
return (err == ENOENT ? 0 : err);
dsl_sync_task_create(ra->dstg, dsl_dataset_snapshot_rename_check,
dsl_dataset_snapshot_rename_sync, ds, ra->newsnap, 0);
return (0);
}
static int
dsl_recursive_rename(char *oldname, const char *newname)
{
int err;
struct renamesnaparg *ra;
dsl_sync_task_t *dst;
spa_t *spa;
char *cp, *fsname = spa_strdup(oldname);
int len = strlen(oldname) + 1;
/* truncate the snapshot name to get the fsname */
cp = strchr(fsname, '@');
*cp = '\0';
err = spa_open(fsname, &spa, FTAG);
if (err) {
kmem_free(fsname, len);
return (err);
}
ra = kmem_alloc(sizeof (struct renamesnaparg), KM_SLEEP);
ra->dstg = dsl_sync_task_group_create(spa_get_dsl(spa));
ra->oldsnap = strchr(oldname, '@') + 1;
ra->newsnap = strchr(newname, '@') + 1;
*ra->failed = '\0';
err = dmu_objset_find(fsname, dsl_snapshot_rename_one, ra,
DS_FIND_CHILDREN);
kmem_free(fsname, len);
if (err == 0) {
err = dsl_sync_task_group_wait(ra->dstg);
}
for (dst = list_head(&ra->dstg->dstg_tasks); dst;
dst = list_next(&ra->dstg->dstg_tasks, dst)) {
dsl_dataset_t *ds = dst->dst_arg1;
if (dst->dst_err) {
dsl_dir_name(ds->ds_dir, ra->failed);
(void) strlcat(ra->failed, "@", sizeof (ra->failed));
(void) strlcat(ra->failed, ra->newsnap,
sizeof (ra->failed));
}
dsl_dataset_rele(ds, ra->dstg);
}
if (err)
(void) strlcpy(oldname, ra->failed, sizeof (ra->failed));
dsl_sync_task_group_destroy(ra->dstg);
kmem_free(ra, sizeof (struct renamesnaparg));
spa_close(spa, FTAG);
return (err);
}
static int
dsl_valid_rename(const char *oldname, void *arg)
{
int delta = *(int *)arg;
if (strlen(oldname) + delta >= MAXNAMELEN)
return (ENAMETOOLONG);
return (0);
}
#pragma weak dmu_objset_rename = dsl_dataset_rename
int
dsl_dataset_rename(char *oldname, const char *newname, boolean_t recursive)
{
dsl_dir_t *dd;
dsl_dataset_t *ds;
const char *tail;
int err;
err = dsl_dir_open(oldname, FTAG, &dd, &tail);
if (err)
return (err);
if (tail == NULL) {
int delta = strlen(newname) - strlen(oldname);
/* if we're growing, validate child name lengths */
if (delta > 0)
err = dmu_objset_find(oldname, dsl_valid_rename,
&delta, DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS);
if (err == 0)
err = dsl_dir_rename(dd, newname);
dsl_dir_close(dd, FTAG);
return (err);
}
if (tail[0] != '@') {
/* the name ended in a nonexistent component */
dsl_dir_close(dd, FTAG);
return (ENOENT);
}
dsl_dir_close(dd, FTAG);
/* new name must be snapshot in same filesystem */
tail = strchr(newname, '@');
if (tail == NULL)
return (EINVAL);
tail++;
if (strncmp(oldname, newname, tail - newname) != 0)
return (EXDEV);
if (recursive) {
err = dsl_recursive_rename(oldname, newname);
} else {
err = dsl_dataset_hold(oldname, FTAG, &ds);
if (err)
return (err);
err = dsl_sync_task_do(ds->ds_dir->dd_pool,
dsl_dataset_snapshot_rename_check,
dsl_dataset_snapshot_rename_sync, ds, (char *)tail, 1);
dsl_dataset_rele(ds, FTAG);
}
return (err);
}
struct promotenode {
list_node_t link;
dsl_dataset_t *ds;
};
struct promotearg {
list_t shared_snaps, origin_snaps, clone_snaps;
dsl_dataset_t *origin_origin;
uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap;
char *err_ds;
};
static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep);
static int
dsl_dataset_promote_check(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dataset_t *hds = arg1;
struct promotearg *pa = arg2;
struct promotenode *snap = list_head(&pa->shared_snaps);
dsl_dataset_t *origin_ds = snap->ds;
int err;
uint64_t unused;
/* Check that it is a real clone */
if (!dsl_dir_is_clone(hds->ds_dir))
return (EINVAL);
/* Since this is so expensive, don't do the preliminary check */
if (!dmu_tx_is_syncing(tx))
return (0);
if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE)
return (EXDEV);
/* compute origin's new unique space */
snap = list_tail(&pa->clone_snaps);
ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object);
dsl_deadlist_space_range(&snap->ds->ds_deadlist,
origin_ds->ds_phys->ds_prev_snap_txg, UINT64_MAX,
&pa->unique, &unused, &unused);
/*
* Walk the snapshots that we are moving
*
* Compute space to transfer. Consider the incremental changes
* to used for 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
*/
pa->used = origin_ds->ds_phys->ds_used_bytes;
pa->comp = origin_ds->ds_phys->ds_compressed_bytes;
pa->uncomp = origin_ds->ds_phys->ds_uncompressed_bytes;
for (snap = list_head(&pa->shared_snaps); snap;
snap = list_next(&pa->shared_snaps, snap)) {
uint64_t val, dlused, dlcomp, dluncomp;
dsl_dataset_t *ds = snap->ds;
/* Check that the snapshot name does not conflict */
VERIFY(0 == dsl_dataset_get_snapname(ds));
err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val);
if (err == 0) {
err = EEXIST;
goto out;
}
if (err != ENOENT)
goto out;
/* The very first snapshot does not have a deadlist */
if (ds->ds_phys->ds_prev_snap_obj == 0)
continue;
dsl_deadlist_space(&ds->ds_deadlist,
&dlused, &dlcomp, &dluncomp);
pa->used += dlused;
pa->comp += dlcomp;
pa->uncomp += dluncomp;
}
/*
* 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 (pa->origin_origin) {
pa->used -= pa->origin_origin->ds_phys->ds_used_bytes;
pa->comp -= pa->origin_origin->ds_phys->ds_compressed_bytes;
pa->uncomp -= pa->origin_origin->ds_phys->ds_uncompressed_bytes;
}
/* Check that there is enough space here */
err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir,
pa->used);
if (err)
return (err);
/*
* 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 (hds->ds_dir->dd_phys->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(&pa->origin_snaps);
err = snaplist_space(&pa->shared_snaps,
snap->ds->ds_dir->dd_origin_txg, &pa->cloneusedsnap);
if (err)
return (err);
err = snaplist_space(&pa->clone_snaps,
snap->ds->ds_dir->dd_origin_txg, &space);
if (err)
return (err);
pa->cloneusedsnap += space;
}
if (origin_ds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) {
err = snaplist_space(&pa->origin_snaps,
origin_ds->ds_phys->ds_creation_txg, &pa->originusedsnap);
if (err)
return (err);
}
return (0);
out:
pa->err_ds = snap->ds->ds_snapname;
return (err);
}
static void
dsl_dataset_promote_sync(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dataset_t *hds = arg1;
struct promotearg *pa = arg2;
struct promotenode *snap = list_head(&pa->shared_snaps);
dsl_dataset_t *origin_ds = snap->ds;
dsl_dataset_t *origin_head;
dsl_dir_t *dd = hds->ds_dir;
dsl_pool_t *dp = hds->ds_dir->dd_pool;
dsl_dir_t *odd = NULL;
uint64_t oldnext_obj;
int64_t delta;
ASSERT(0 == (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE));
snap = list_head(&pa->origin_snaps);
origin_head = snap->ds;
/*
* We need to explicitly open odd, since origin_ds's dd will be
* changing.
*/
VERIFY(0 == dsl_dir_open_obj(dp, origin_ds->ds_dir->dd_object,
NULL, FTAG, &odd));
/* change origin's next snap */
dmu_buf_will_dirty(origin_ds->ds_dbuf, tx);
oldnext_obj = origin_ds->ds_phys->ds_next_snap_obj;
snap = list_tail(&pa->clone_snaps);
ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object);
origin_ds->ds_phys->ds_next_snap_obj = snap->ds->ds_object;
/* change the origin's next clone */
if (origin_ds->ds_phys->ds_next_clones_obj) {
remove_from_next_clones(origin_ds, snap->ds->ds_object, tx);
VERIFY3U(0, ==, zap_add_int(dp->dp_meta_objset,
origin_ds->ds_phys->ds_next_clones_obj,
oldnext_obj, tx));
}
/* change origin */
dmu_buf_will_dirty(dd->dd_dbuf, tx);
ASSERT3U(dd->dd_phys->dd_origin_obj, ==, origin_ds->ds_object);
dd->dd_phys->dd_origin_obj = odd->dd_phys->dd_origin_obj;
dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg;
dmu_buf_will_dirty(odd->dd_dbuf, tx);
odd->dd_phys->dd_origin_obj = origin_ds->ds_object;
origin_head->ds_dir->dd_origin_txg =
origin_ds->ds_phys->ds_creation_txg;
/* change dd_clone entries */
if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset,
odd->dd_phys->dd_clones, hds->ds_object, tx));
VERIFY3U(0, ==, zap_add_int(dp->dp_meta_objset,
pa->origin_origin->ds_dir->dd_phys->dd_clones,
hds->ds_object, tx));
VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset,
pa->origin_origin->ds_dir->dd_phys->dd_clones,
origin_head->ds_object, tx));
if (dd->dd_phys->dd_clones == 0) {
dd->dd_phys->dd_clones = zap_create(dp->dp_meta_objset,
DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx);
}
VERIFY3U(0, ==, zap_add_int(dp->dp_meta_objset,
dd->dd_phys->dd_clones, origin_head->ds_object, tx));
}
/* move snapshots to this dir */
for (snap = list_head(&pa->shared_snaps); snap;
snap = list_next(&pa->shared_snaps, snap)) {
dsl_dataset_t *ds = snap->ds;
/* unregister props as dsl_dir is changing */
if (ds->ds_objset) {
dmu_objset_evict(ds->ds_objset);
ds->ds_objset = NULL;
}
/* move snap name entry */
VERIFY(0 == dsl_dataset_get_snapname(ds));
VERIFY(0 == dsl_dataset_snap_remove(origin_head,
ds->ds_snapname, tx));
VERIFY(0 == zap_add(dp->dp_meta_objset,
hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname,
8, 1, &ds->ds_object, tx));
/* change containing dsl_dir */
dmu_buf_will_dirty(ds->ds_dbuf, tx);
ASSERT3U(ds->ds_phys->ds_dir_obj, ==, odd->dd_object);
ds->ds_phys->ds_dir_obj = dd->dd_object;
ASSERT3P(ds->ds_dir, ==, odd);
dsl_dir_close(ds->ds_dir, ds);
VERIFY(0 == dsl_dir_open_obj(dp, dd->dd_object,
NULL, ds, &ds->ds_dir));
/* move any clone references */
if (ds->ds_phys->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,
ds->ds_phys->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;
}
VERIFY3U(0, ==, dsl_dataset_hold_obj(dp,
za.za_first_integer, FTAG, &cnds));
o = cnds->ds_dir->dd_phys->dd_head_dataset_obj;
VERIFY3U(zap_remove_int(dp->dp_meta_objset,
odd->dd_phys->dd_clones, o, tx), ==, 0);
VERIFY3U(zap_add_int(dp->dp_meta_objset,
dd->dd_phys->dd_clones, o, tx), ==, 0);
dsl_dataset_rele(cnds, FTAG);
}
zap_cursor_fini(&zc);
}
ASSERT3U(dsl_prop_numcb(ds), ==, 0);
}
/*
* 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 = pa->cloneusedsnap -
dd->dd_phys->dd_used_breakdown[DD_USED_SNAP];
ASSERT3S(delta, >=, 0);
ASSERT3U(pa->used, >=, delta);
dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx);
dsl_dir_diduse_space(dd, DD_USED_HEAD,
pa->used - delta, pa->comp, pa->uncomp, tx);
delta = pa->originusedsnap -
odd->dd_phys->dd_used_breakdown[DD_USED_SNAP];
ASSERT3S(delta, <=, 0);
ASSERT3U(pa->used, >=, -delta);
dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx);
dsl_dir_diduse_space(odd, DD_USED_HEAD,
-pa->used - delta, -pa->comp, -pa->uncomp, tx);
origin_ds->ds_phys->ds_unique_bytes = pa->unique;
/* log history record */
spa_history_log_internal(LOG_DS_PROMOTE, dd->dd_pool->dp_spa, tx,
"dataset = %llu", hds->ds_object);
dsl_dir_close(odd, FTAG);
}
static char *snaplist_tag = "snaplist";
/*
* 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, boolean_t own,
uint64_t first_obj, uint64_t last_obj, list_t *l)
{
uint64_t obj = last_obj;
ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock));
list_create(l, sizeof (struct promotenode),
offsetof(struct promotenode, link));
while (obj != first_obj) {
dsl_dataset_t *ds;
struct promotenode *snap;
int err;
if (own) {
err = dsl_dataset_own_obj(dp, obj,
0, snaplist_tag, &ds);
if (err == 0)
dsl_dataset_make_exclusive(ds, snaplist_tag);
} else {
err = dsl_dataset_hold_obj(dp, obj, snaplist_tag, &ds);
}
if (err == ENOENT) {
/* lost race with snapshot destroy */
struct promotenode *last = list_tail(l);
ASSERT(obj != last->ds->ds_phys->ds_prev_snap_obj);
obj = last->ds->ds_phys->ds_prev_snap_obj;
continue;
} else if (err) {
return (err);
}
if (first_obj == 0)
first_obj = ds->ds_dir->dd_phys->dd_origin_obj;
snap = kmem_alloc(sizeof (struct promotenode), KM_SLEEP);
snap->ds = ds;
list_insert_tail(l, snap);
obj = ds->ds_phys->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, boolean_t own)
{
struct promotenode *snap;
if (!l || !list_link_active(&l->list_head))
return;
while ((snap = list_tail(l)) != NULL) {
list_remove(l, snap);
if (own)
dsl_dataset_disown(snap->ds, snaplist_tag);
else
dsl_dataset_rele(snap->ds, snaplist_tag);
kmem_free(snap, sizeof (struct promotenode));
}
list_destroy(l);
}
/*
* Promote a clone. Nomenclature note:
* "clone" or "cds": the original clone which is being promoted
* "origin" or "ods": the snapshot which is originally clone's origin
* "origin head" or "ohds": the dataset which is the head
* (filesystem/volume) for the origin
* "origin origin": the origin of the origin's filesystem (typically
* NULL, indicating that the clone is not a clone of a clone).
*/
int
dsl_dataset_promote(const char *name, char *conflsnap)
{
dsl_dataset_t *ds;
dsl_dir_t *dd;
dsl_pool_t *dp;
dmu_object_info_t doi;
struct promotearg pa;
struct promotenode *snap;
int err;
bzero(&pa, sizeof(struct promotearg));
err = dsl_dataset_hold(name, FTAG, &ds);
if (err)
return (err);
dd = ds->ds_dir;
dp = dd->dd_pool;
err = dmu_object_info(dp->dp_meta_objset,
ds->ds_phys->ds_snapnames_zapobj, &doi);
if (err) {
dsl_dataset_rele(ds, FTAG);
return (err);
}
if (dsl_dataset_is_snapshot(ds) || dd->dd_phys->dd_origin_obj == 0) {
dsl_dataset_rele(ds, FTAG);
return (EINVAL);
}
/*
* We are going to inherit all the snapshots taken before our
* origin (i.e., our new origin will be our parent's origin).
* Take ownership of them so that we can rename them into our
* namespace.
*/
rw_enter(&dp->dp_config_rwlock, RW_READER);
err = snaplist_make(dp, B_TRUE, 0, dd->dd_phys->dd_origin_obj,
&pa.shared_snaps);
if (err != 0)
goto out;
err = snaplist_make(dp, B_FALSE, 0, ds->ds_object, &pa.clone_snaps);
if (err != 0)
goto out;
snap = list_head(&pa.shared_snaps);
ASSERT3U(snap->ds->ds_object, ==, dd->dd_phys->dd_origin_obj);
err = snaplist_make(dp, B_FALSE, dd->dd_phys->dd_origin_obj,
snap->ds->ds_dir->dd_phys->dd_head_dataset_obj, &pa.origin_snaps);
if (err != 0)
goto out;
if (snap->ds->ds_dir->dd_phys->dd_origin_obj != 0) {
err = dsl_dataset_hold_obj(dp,
snap->ds->ds_dir->dd_phys->dd_origin_obj,
FTAG, &pa.origin_origin);
if (err != 0)
goto out;
}
out:
rw_exit(&dp->dp_config_rwlock);
/*
* Add in 128x the snapnames zapobj size, since we will be moving
* a bunch of snapnames to the promoted ds, and dirtying their
* bonus buffers.
*/
if (err == 0) {
err = dsl_sync_task_do(dp, dsl_dataset_promote_check,
dsl_dataset_promote_sync, ds, &pa,
2 + 2 * doi.doi_physical_blocks_512);
if (err && pa.err_ds && conflsnap)
(void) strncpy(conflsnap, pa.err_ds, MAXNAMELEN);
}
snaplist_destroy(&pa.shared_snaps, B_TRUE);
snaplist_destroy(&pa.clone_snaps, B_FALSE);
snaplist_destroy(&pa.origin_snaps, B_FALSE);
if (pa.origin_origin)
dsl_dataset_rele(pa.origin_origin, FTAG);
dsl_dataset_rele(ds, FTAG);
return (err);
}
struct cloneswaparg {
dsl_dataset_t *cds; /* clone dataset */
dsl_dataset_t *ohds; /* origin's head dataset */
boolean_t force;
int64_t unused_refres_delta; /* change in unconsumed refreservation */
};
/* ARGSUSED */
static int
dsl_dataset_clone_swap_check(void *arg1, void *arg2, dmu_tx_t *tx)
{
struct cloneswaparg *csa = arg1;
/* they should both be heads */
if (dsl_dataset_is_snapshot(csa->cds) ||
dsl_dataset_is_snapshot(csa->ohds))
return (EINVAL);
/* the branch point should be just before them */
if (csa->cds->ds_prev != csa->ohds->ds_prev)
return (EINVAL);
/* cds should be the clone (unless they are unrelated) */
if (csa->cds->ds_prev != NULL &&
csa->cds->ds_prev != csa->cds->ds_dir->dd_pool->dp_origin_snap &&
csa->ohds->ds_object !=
csa->cds->ds_prev->ds_phys->ds_next_snap_obj)
return (EINVAL);
/* the clone should be a child of the origin */
if (csa->cds->ds_dir->dd_parent != csa->ohds->ds_dir)
return (EINVAL);
/* ohds shouldn't be modified unless 'force' */
if (!csa->force && dsl_dataset_modified_since_lastsnap(csa->ohds))
return (ETXTBSY);
/* adjust amount of any unconsumed refreservation */
csa->unused_refres_delta =
(int64_t)MIN(csa->ohds->ds_reserved,
csa->ohds->ds_phys->ds_unique_bytes) -
(int64_t)MIN(csa->ohds->ds_reserved,
csa->cds->ds_phys->ds_unique_bytes);
if (csa->unused_refres_delta > 0 &&
csa->unused_refres_delta >
dsl_dir_space_available(csa->ohds->ds_dir, NULL, 0, TRUE))
return (ENOSPC);
if (csa->ohds->ds_quota != 0 &&
csa->cds->ds_phys->ds_unique_bytes > csa->ohds->ds_quota)
return (EDQUOT);
return (0);
}
/* ARGSUSED */
static void
dsl_dataset_clone_swap_sync(void *arg1, void *arg2, dmu_tx_t *tx)
{
struct cloneswaparg *csa = arg1;
dsl_pool_t *dp = csa->cds->ds_dir->dd_pool;
ASSERT(csa->cds->ds_reserved == 0);
ASSERT(csa->ohds->ds_quota == 0 ||
csa->cds->ds_phys->ds_unique_bytes <= csa->ohds->ds_quota);
dmu_buf_will_dirty(csa->cds->ds_dbuf, tx);
dmu_buf_will_dirty(csa->ohds->ds_dbuf, tx);
if (csa->cds->ds_objset != NULL) {
dmu_objset_evict(csa->cds->ds_objset);
csa->cds->ds_objset = NULL;
}
if (csa->ohds->ds_objset != NULL) {
dmu_objset_evict(csa->ohds->ds_objset);
csa->ohds->ds_objset = NULL;
}
/*
* Reset origin's unique bytes, if it exists.
*/
if (csa->cds->ds_prev) {
dsl_dataset_t *origin = csa->cds->ds_prev;
uint64_t comp, uncomp;
dmu_buf_will_dirty(origin->ds_dbuf, tx);
dsl_deadlist_space_range(&csa->cds->ds_deadlist,
origin->ds_phys->ds_prev_snap_txg, UINT64_MAX,
&origin->ds_phys->ds_unique_bytes, &comp, &uncomp);
}
/* swap blkptrs */
{
blkptr_t tmp;
tmp = csa->ohds->ds_phys->ds_bp;
csa->ohds->ds_phys->ds_bp = csa->cds->ds_phys->ds_bp;
csa->cds->ds_phys->ds_bp = tmp;
}
/* 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(csa->cds->ds_dir->dd_phys->
dd_used_breakdown[DD_USED_SNAP], ==, 0);
dsl_deadlist_space(&csa->cds->ds_deadlist,
&cdl_used, &cdl_comp, &cdl_uncomp);
dsl_deadlist_space(&csa->ohds->ds_deadlist,
&odl_used, &odl_comp, &odl_uncomp);
dused = csa->cds->ds_phys->ds_used_bytes + cdl_used -
(csa->ohds->ds_phys->ds_used_bytes + odl_used);
dcomp = csa->cds->ds_phys->ds_compressed_bytes + cdl_comp -
(csa->ohds->ds_phys->ds_compressed_bytes + odl_comp);
duncomp = csa->cds->ds_phys->ds_uncompressed_bytes +
cdl_uncomp -
(csa->ohds->ds_phys->ds_uncompressed_bytes + odl_uncomp);
dsl_dir_diduse_space(csa->ohds->ds_dir, DD_USED_HEAD,
dused, dcomp, duncomp, tx);
dsl_dir_diduse_space(csa->cds->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(&csa->cds->ds_deadlist,
csa->ohds->ds_dir->dd_origin_txg, UINT64_MAX,
&cdl_used, &cdl_comp, &cdl_uncomp);
dsl_deadlist_space_range(&csa->ohds->ds_deadlist,
csa->ohds->ds_dir->dd_origin_txg, UINT64_MAX,
&odl_used, &odl_comp, &odl_uncomp);
dsl_dir_transfer_space(csa->ohds->ds_dir, cdl_used - odl_used,
DD_USED_HEAD, DD_USED_SNAP, tx);
}
/* swap ds_*_bytes */
SWITCH64(csa->ohds->ds_phys->ds_used_bytes,
csa->cds->ds_phys->ds_used_bytes);
SWITCH64(csa->ohds->ds_phys->ds_compressed_bytes,
csa->cds->ds_phys->ds_compressed_bytes);
SWITCH64(csa->ohds->ds_phys->ds_uncompressed_bytes,
csa->cds->ds_phys->ds_uncompressed_bytes);
SWITCH64(csa->ohds->ds_phys->ds_unique_bytes,
csa->cds->ds_phys->ds_unique_bytes);
/* apply any parent delta for change in unconsumed refreservation */
dsl_dir_diduse_space(csa->ohds->ds_dir, DD_USED_REFRSRV,
csa->unused_refres_delta, 0, 0, tx);
/*
* Swap deadlists.
*/
dsl_deadlist_close(&csa->cds->ds_deadlist);
dsl_deadlist_close(&csa->ohds->ds_deadlist);
SWITCH64(csa->ohds->ds_phys->ds_deadlist_obj,
csa->cds->ds_phys->ds_deadlist_obj);
dsl_deadlist_open(&csa->cds->ds_deadlist, dp->dp_meta_objset,
csa->cds->ds_phys->ds_deadlist_obj);
dsl_deadlist_open(&csa->ohds->ds_deadlist, dp->dp_meta_objset,
csa->ohds->ds_phys->ds_deadlist_obj);
dsl_scan_ds_clone_swapped(csa->ohds, csa->cds, tx);
}
/*
* Swap 'clone' with its origin head datasets. Used at the end of "zfs
* recv" into an existing fs to swizzle the file system to the new
* version, and by "zfs rollback". Can also be used to swap two
* independent head datasets if neither has any snapshots.
*/
int
dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head,
boolean_t force)
{
struct cloneswaparg csa;
int error;
ASSERT(clone->ds_owner);
ASSERT(origin_head->ds_owner);
retry:
/*
* Need exclusive access for the swap. If we're swapping these
* datasets back after an error, we already hold the locks.
*/
if (!RW_WRITE_HELD(&clone->ds_rwlock))
rw_enter(&clone->ds_rwlock, RW_WRITER);
if (!RW_WRITE_HELD(&origin_head->ds_rwlock) &&
!rw_tryenter(&origin_head->ds_rwlock, RW_WRITER)) {
rw_exit(&clone->ds_rwlock);
rw_enter(&origin_head->ds_rwlock, RW_WRITER);
if (!rw_tryenter(&clone->ds_rwlock, RW_WRITER)) {
rw_exit(&origin_head->ds_rwlock);
goto retry;
}
}
csa.cds = clone;
csa.ohds = origin_head;
csa.force = force;
error = dsl_sync_task_do(clone->ds_dir->dd_pool,
dsl_dataset_clone_swap_check,
dsl_dataset_clone_swap_sync, &csa, NULL, 9);
return (error);
}
/*
* 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)
{
spa_t *spa;
dsl_pool_t *dp;
dsl_dataset_t *ds;
int error;
if ((error = spa_open(pname, &spa, FTAG)) != 0)
return (error);
dp = spa_get_dsl(spa);
rw_enter(&dp->dp_config_rwlock, RW_READER);
if ((error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds)) == 0) {
dsl_dataset_name(ds, buf);
dsl_dataset_rele(ds, FTAG);
}
rw_exit(&dp->dp_config_rwlock);
spa_close(spa, 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 > ds->ds_phys->ds_unique_bytes) {
ASSERT3U(*used, >=,
ds->ds_reserved - ds->ds_phys->ds_unique_bytes);
*used -= (ds->ds_reserved - ds->ds_phys->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 (ds->ds_phys->ds_used_bytes + inflight >= ds->ds_quota) {
if (inflight > 0 || ds->ds_phys->ds_used_bytes < ds->ds_quota)
error = ERESTART;
else
error = EDQUOT;
}
mutex_exit(&ds->ds_lock);
return (error);
}
/* ARGSUSED */
static int
dsl_dataset_set_quota_check(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
dsl_prop_setarg_t *psa = arg2;
int err;
if (spa_version(ds->ds_dir->dd_pool->dp_spa) < SPA_VERSION_REFQUOTA)
return (ENOTSUP);
if ((err = dsl_prop_predict_sync(ds->ds_dir, psa)) != 0)
return (err);
if (psa->psa_effective_value == 0)
return (0);
if (psa->psa_effective_value < ds->ds_phys->ds_used_bytes ||
psa->psa_effective_value < ds->ds_reserved)
return (ENOSPC);
return (0);
}
extern void dsl_prop_set_sync(void *, void *, dmu_tx_t *);
void
dsl_dataset_set_quota_sync(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
dsl_prop_setarg_t *psa = arg2;
uint64_t effective_value = psa->psa_effective_value;
dsl_prop_set_sync(ds, psa, tx);
DSL_PROP_CHECK_PREDICTION(ds->ds_dir, psa);
if (ds->ds_quota != effective_value) {
dmu_buf_will_dirty(ds->ds_dbuf, tx);
ds->ds_quota = effective_value;
spa_history_log_internal(LOG_DS_REFQUOTA,
ds->ds_dir->dd_pool->dp_spa, tx, "%lld dataset = %llu ",
(longlong_t)ds->ds_quota, ds->ds_object);
}
}
int
dsl_dataset_set_quota(const char *dsname, zprop_source_t source, uint64_t quota)
{
dsl_dataset_t *ds;
dsl_prop_setarg_t psa;
int err;
dsl_prop_setarg_init_uint64(&psa, "refquota", source, &quota);
err = dsl_dataset_hold(dsname, FTAG, &ds);
if (err)
return (err);
/*
* If someone removes a file, then tries to set the quota, we
* want to make sure the file freeing takes effect.
*/
txg_wait_open(ds->ds_dir->dd_pool, 0);
err = dsl_sync_task_do(ds->ds_dir->dd_pool,
dsl_dataset_set_quota_check, dsl_dataset_set_quota_sync,
ds, &psa, 0);
dsl_dataset_rele(ds, FTAG);
return (err);
}
static int
dsl_dataset_set_reservation_check(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
dsl_prop_setarg_t *psa = arg2;
uint64_t effective_value;
uint64_t unique;
int err;
if (spa_version(ds->ds_dir->dd_pool->dp_spa) <
SPA_VERSION_REFRESERVATION)
return (ENOTSUP);
if (dsl_dataset_is_snapshot(ds))
return (EINVAL);
if ((err = dsl_prop_predict_sync(ds->ds_dir, psa)) != 0)
return (err);
effective_value = psa->psa_effective_value;
/*
* If we are doing the preliminary check in open context, the
* space estimates may be inaccurate.
*/
if (!dmu_tx_is_syncing(tx))
return (0);
mutex_enter(&ds->ds_lock);
if (!DS_UNIQUE_IS_ACCURATE(ds))
dsl_dataset_recalc_head_uniq(ds);
unique = ds->ds_phys->ds_unique_bytes;
mutex_exit(&ds->ds_lock);
if (MAX(unique, effective_value) > MAX(unique, ds->ds_reserved)) {
uint64_t delta = MAX(unique, effective_value) -
MAX(unique, ds->ds_reserved);
if (delta > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE))
return (ENOSPC);
if (ds->ds_quota > 0 &&
effective_value > ds->ds_quota)
return (ENOSPC);
}
return (0);
}
static void
dsl_dataset_set_reservation_sync(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
dsl_prop_setarg_t *psa = arg2;
uint64_t effective_value = psa->psa_effective_value;
uint64_t unique;
int64_t delta;
dsl_prop_set_sync(ds, psa, tx);
DSL_PROP_CHECK_PREDICTION(ds->ds_dir, psa);
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 = ds->ds_phys->ds_unique_bytes;
delta = MAX(0, (int64_t)(effective_value - unique)) -
MAX(0, (int64_t)(ds->ds_reserved - unique));
ds->ds_reserved = effective_value;
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);
spa_history_log_internal(LOG_DS_REFRESERV,
ds->ds_dir->dd_pool->dp_spa, tx, "%lld dataset = %llu",
(longlong_t)effective_value, ds->ds_object);
}
int
dsl_dataset_set_reservation(const char *dsname, zprop_source_t source,
uint64_t reservation)
{
dsl_dataset_t *ds;
dsl_prop_setarg_t psa;
int err;
dsl_prop_setarg_init_uint64(&psa, "refreservation", source,
&reservation);
err = dsl_dataset_hold(dsname, FTAG, &ds);
if (err)
return (err);
err = dsl_sync_task_do(ds->ds_dir->dd_pool,
dsl_dataset_set_reservation_check,
dsl_dataset_set_reservation_sync, ds, &psa, 0);
dsl_dataset_rele(ds, FTAG);
return (err);
}
typedef struct zfs_hold_cleanup_arg {
dsl_pool_t *dp;
uint64_t dsobj;
char htag[MAXNAMELEN];
} zfs_hold_cleanup_arg_t;
static void
dsl_dataset_user_release_onexit(void *arg)
{
zfs_hold_cleanup_arg_t *ca = arg;
(void) dsl_dataset_user_release_tmp(ca->dp, ca->dsobj, ca->htag,
B_TRUE);
kmem_free(ca, sizeof (zfs_hold_cleanup_arg_t));
}
void
dsl_register_onexit_hold_cleanup(dsl_dataset_t *ds, const char *htag,
minor_t minor)
{
zfs_hold_cleanup_arg_t *ca;
ca = kmem_alloc(sizeof (zfs_hold_cleanup_arg_t), KM_SLEEP);
ca->dp = ds->ds_dir->dd_pool;
ca->dsobj = ds->ds_object;
(void) strlcpy(ca->htag, htag, sizeof (ca->htag));
VERIFY3U(0, ==, zfs_onexit_add_cb(minor,
dsl_dataset_user_release_onexit, ca, NULL));
}
/*
* If you add new checks here, you may need to add
* additional checks to the "temporary" case in
* snapshot_check() in dmu_objset.c.
*/
static int
dsl_dataset_user_hold_check(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
struct dsl_ds_holdarg *ha = arg2;
char *htag = ha->htag;
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
int error = 0;
if (spa_version(ds->ds_dir->dd_pool->dp_spa) < SPA_VERSION_USERREFS)
return (ENOTSUP);
if (!dsl_dataset_is_snapshot(ds))
return (EINVAL);
/* tags must be unique */
mutex_enter(&ds->ds_lock);
if (ds->ds_phys->ds_userrefs_obj) {
error = zap_lookup(mos, ds->ds_phys->ds_userrefs_obj, htag,
8, 1, tx);
if (error == 0)
error = EEXIST;
else if (error == ENOENT)
error = 0;
}
mutex_exit(&ds->ds_lock);
if (error == 0 && ha->temphold &&
strlen(htag) + MAX_TAG_PREFIX_LEN >= MAXNAMELEN)
error = E2BIG;
return (error);
}
void
dsl_dataset_user_hold_sync(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
struct dsl_ds_holdarg *ha = arg2;
char *htag = ha->htag;
dsl_pool_t *dp = ds->ds_dir->dd_pool;
objset_t *mos = dp->dp_meta_objset;
uint64_t now = gethrestime_sec();
uint64_t zapobj;
mutex_enter(&ds->ds_lock);
if (ds->ds_phys->ds_userrefs_obj == 0) {
/*
* This is the first user hold for this dataset. Create
* the userrefs zap object.
*/
dmu_buf_will_dirty(ds->ds_dbuf, tx);
zapobj = ds->ds_phys->ds_userrefs_obj =
zap_create(mos, DMU_OT_USERREFS, DMU_OT_NONE, 0, tx);
} else {
zapobj = ds->ds_phys->ds_userrefs_obj;
}
ds->ds_userrefs++;
mutex_exit(&ds->ds_lock);
VERIFY(0 == zap_add(mos, zapobj, htag, 8, 1, &now, tx));
if (ha->temphold) {
VERIFY(0 == dsl_pool_user_hold(dp, ds->ds_object,
htag, &now, tx));
}
spa_history_log_internal(LOG_DS_USER_HOLD,
dp->dp_spa, tx, "<%s> temp = %d dataset = %llu", htag,
(int)ha->temphold, ds->ds_object);
}
static int
dsl_dataset_user_hold_one(const char *dsname, void *arg)
{
struct dsl_ds_holdarg *ha = arg;
dsl_dataset_t *ds;
int error;
char *name;
/* alloc a buffer to hold dsname@snapname plus terminating NULL */
name = kmem_asprintf("%s@%s", dsname, ha->snapname);
error = dsl_dataset_hold(name, ha->dstg, &ds);
strfree(name);
if (error == 0) {
ha->gotone = B_TRUE;
dsl_sync_task_create(ha->dstg, dsl_dataset_user_hold_check,
dsl_dataset_user_hold_sync, ds, ha, 0);
} else if (error == ENOENT && ha->recursive) {
error = 0;
} else {
(void) strlcpy(ha->failed, dsname, sizeof (ha->failed));
}
return (error);
}
int
dsl_dataset_user_hold_for_send(dsl_dataset_t *ds, char *htag,
boolean_t temphold)
{
struct dsl_ds_holdarg *ha;
int error;
ha = kmem_zalloc(sizeof (struct dsl_ds_holdarg), KM_SLEEP);
ha->htag = htag;
ha->temphold = temphold;
error = dsl_sync_task_do(ds->ds_dir->dd_pool,
dsl_dataset_user_hold_check, dsl_dataset_user_hold_sync,
ds, ha, 0);
kmem_free(ha, sizeof (struct dsl_ds_holdarg));
return (error);
}
int
dsl_dataset_user_hold(char *dsname, char *snapname, char *htag,
boolean_t recursive, boolean_t temphold, int cleanup_fd)
{
struct dsl_ds_holdarg *ha;
dsl_sync_task_t *dst;
spa_t *spa;
int error;
minor_t minor = 0;
if (cleanup_fd != -1) {
/* Currently we only support cleanup-on-exit of tempholds. */
if (!temphold)
return (EINVAL);
error = zfs_onexit_fd_hold(cleanup_fd, &minor);
if (error)
return (error);
}
ha = kmem_zalloc(sizeof (struct dsl_ds_holdarg), KM_SLEEP);
(void) strlcpy(ha->failed, dsname, sizeof (ha->failed));
error = spa_open(dsname, &spa, FTAG);
if (error) {
kmem_free(ha, sizeof (struct dsl_ds_holdarg));
if (cleanup_fd != -1)
zfs_onexit_fd_rele(cleanup_fd);
return (error);
}
ha->dstg = dsl_sync_task_group_create(spa_get_dsl(spa));
ha->htag = htag;
ha->snapname = snapname;
ha->recursive = recursive;
ha->temphold = temphold;
if (recursive) {
error = dmu_objset_find(dsname, dsl_dataset_user_hold_one,
ha, DS_FIND_CHILDREN);
} else {
error = dsl_dataset_user_hold_one(dsname, ha);
}
if (error == 0)
error = dsl_sync_task_group_wait(ha->dstg);
for (dst = list_head(&ha->dstg->dstg_tasks); dst;
dst = list_next(&ha->dstg->dstg_tasks, dst)) {
dsl_dataset_t *ds = dst->dst_arg1;
if (dst->dst_err) {
dsl_dataset_name(ds, ha->failed);
*strchr(ha->failed, '@') = '\0';
} else if (error == 0 && minor != 0 && temphold) {
/*
* If this hold is to be released upon process exit,
* register that action now.
*/
dsl_register_onexit_hold_cleanup(ds, htag, minor);
}
dsl_dataset_rele(ds, ha->dstg);
}
if (error == 0 && recursive && !ha->gotone)
error = ENOENT;
if (error)
(void) strlcpy(dsname, ha->failed, sizeof (ha->failed));
dsl_sync_task_group_destroy(ha->dstg);
kmem_free(ha, sizeof (struct dsl_ds_holdarg));
spa_close(spa, FTAG);
if (cleanup_fd != -1)
zfs_onexit_fd_rele(cleanup_fd);
return (error);
}
struct dsl_ds_releasearg {
dsl_dataset_t *ds;
const char *htag;
boolean_t own; /* do we own or just hold ds? */
};
static int
dsl_dataset_release_might_destroy(dsl_dataset_t *ds, const char *htag,
boolean_t *might_destroy)
{
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
uint64_t zapobj;
uint64_t tmp;
int error;
*might_destroy = B_FALSE;
mutex_enter(&ds->ds_lock);
zapobj = ds->ds_phys->ds_userrefs_obj;
if (zapobj == 0) {
/* The tag can't possibly exist */
mutex_exit(&ds->ds_lock);
return (ESRCH);
}
/* Make sure the tag exists */
error = zap_lookup(mos, zapobj, htag, 8, 1, &tmp);
if (error) {
mutex_exit(&ds->ds_lock);
if (error == ENOENT)
error = ESRCH;
return (error);
}
if (ds->ds_userrefs == 1 && ds->ds_phys->ds_num_children == 1 &&
DS_IS_DEFER_DESTROY(ds))
*might_destroy = B_TRUE;
mutex_exit(&ds->ds_lock);
return (0);
}
static int
dsl_dataset_user_release_check(void *arg1, void *tag, dmu_tx_t *tx)
{
struct dsl_ds_releasearg *ra = arg1;
dsl_dataset_t *ds = ra->ds;
boolean_t might_destroy;
int error;
if (spa_version(ds->ds_dir->dd_pool->dp_spa) < SPA_VERSION_USERREFS)
return (ENOTSUP);
error = dsl_dataset_release_might_destroy(ds, ra->htag, &might_destroy);
if (error)
return (error);
if (might_destroy) {
struct dsl_ds_destroyarg dsda = {0};
if (dmu_tx_is_syncing(tx)) {
/*
* If we're not prepared to remove the snapshot,
* we can't allow the release to happen right now.
*/
if (!ra->own)
return (EBUSY);
}
dsda.ds = ds;
dsda.releasing = B_TRUE;
return (dsl_dataset_destroy_check(&dsda, tag, tx));
}
return (0);
}
static void
dsl_dataset_user_release_sync(void *arg1, void *tag, dmu_tx_t *tx)
{
struct dsl_ds_releasearg *ra = arg1;
dsl_dataset_t *ds = ra->ds;
dsl_pool_t *dp = ds->ds_dir->dd_pool;
objset_t *mos = dp->dp_meta_objset;
uint64_t zapobj;
uint64_t dsobj = ds->ds_object;
uint64_t refs;
int error;
mutex_enter(&ds->ds_lock);
ds->ds_userrefs--;
refs = ds->ds_userrefs;
mutex_exit(&ds->ds_lock);
error = dsl_pool_user_release(dp, ds->ds_object, ra->htag, tx);
VERIFY(error == 0 || error == ENOENT);
zapobj = ds->ds_phys->ds_userrefs_obj;
VERIFY(0 == zap_remove(mos, zapobj, ra->htag, tx));
if (ds->ds_userrefs == 0 && ds->ds_phys->ds_num_children == 1 &&
DS_IS_DEFER_DESTROY(ds)) {
struct dsl_ds_destroyarg dsda = {0};
ASSERT(ra->own);
dsda.ds = ds;
dsda.releasing = B_TRUE;
/* We already did the destroy_check */
dsl_dataset_destroy_sync(&dsda, tag, tx);
}
spa_history_log_internal(LOG_DS_USER_RELEASE,
dp->dp_spa, tx, "<%s> %lld dataset = %llu",
ra->htag, (longlong_t)refs, dsobj);
}
static int
dsl_dataset_user_release_one(const char *dsname, void *arg)
{
struct dsl_ds_holdarg *ha = arg;
struct dsl_ds_releasearg *ra;
dsl_dataset_t *ds;
int error;
void *dtag = ha->dstg;
char *name;
boolean_t own = B_FALSE;
boolean_t might_destroy;
/* alloc a buffer to hold dsname@snapname, plus the terminating NULL */
name = kmem_asprintf("%s@%s", dsname, ha->snapname);
error = dsl_dataset_hold(name, dtag, &ds);
strfree(name);
if (error == ENOENT && ha->recursive)
return (0);
(void) strlcpy(ha->failed, dsname, sizeof (ha->failed));
if (error)
return (error);
ha->gotone = B_TRUE;
ASSERT(dsl_dataset_is_snapshot(ds));
error = dsl_dataset_release_might_destroy(ds, ha->htag, &might_destroy);
if (error) {
dsl_dataset_rele(ds, dtag);
return (error);
}
if (might_destroy) {
#ifdef _KERNEL
name = kmem_asprintf("%s@%s", dsname, ha->snapname);
error = zfs_unmount_snap(name, NULL);
strfree(name);
if (error) {
dsl_dataset_rele(ds, dtag);
return (error);
}
#endif
if (!dsl_dataset_tryown(ds, B_TRUE, dtag)) {
dsl_dataset_rele(ds, dtag);
return (EBUSY);
} else {
own = B_TRUE;
dsl_dataset_make_exclusive(ds, dtag);
}
}
ra = kmem_alloc(sizeof (struct dsl_ds_releasearg), KM_SLEEP);
ra->ds = ds;
ra->htag = ha->htag;
ra->own = own;
dsl_sync_task_create(ha->dstg, dsl_dataset_user_release_check,
dsl_dataset_user_release_sync, ra, dtag, 0);
return (0);
}
int
dsl_dataset_user_release(char *dsname, char *snapname, char *htag,
boolean_t recursive)
{
struct dsl_ds_holdarg *ha;
dsl_sync_task_t *dst;
spa_t *spa;
int error;
top:
ha = kmem_zalloc(sizeof (struct dsl_ds_holdarg), KM_SLEEP);
(void) strlcpy(ha->failed, dsname, sizeof (ha->failed));
error = spa_open(dsname, &spa, FTAG);
if (error) {
kmem_free(ha, sizeof (struct dsl_ds_holdarg));
return (error);
}
ha->dstg = dsl_sync_task_group_create(spa_get_dsl(spa));
ha->htag = htag;
ha->snapname = snapname;
ha->recursive = recursive;
if (recursive) {
error = dmu_objset_find(dsname, dsl_dataset_user_release_one,
ha, DS_FIND_CHILDREN);
} else {
error = dsl_dataset_user_release_one(dsname, ha);
}
if (error == 0)
error = dsl_sync_task_group_wait(ha->dstg);
for (dst = list_head(&ha->dstg->dstg_tasks); dst;
dst = list_next(&ha->dstg->dstg_tasks, dst)) {
struct dsl_ds_releasearg *ra = dst->dst_arg1;
dsl_dataset_t *ds = ra->ds;
if (dst->dst_err)
dsl_dataset_name(ds, ha->failed);
if (ra->own)
dsl_dataset_disown(ds, ha->dstg);
else
dsl_dataset_rele(ds, ha->dstg);
kmem_free(ra, sizeof (struct dsl_ds_releasearg));
}
if (error == 0 && recursive && !ha->gotone)
error = ENOENT;
if (error && error != EBUSY)
(void) strlcpy(dsname, ha->failed, sizeof (ha->failed));
dsl_sync_task_group_destroy(ha->dstg);
kmem_free(ha, sizeof (struct dsl_ds_holdarg));
spa_close(spa, FTAG);
/*
* We can get EBUSY if we were racing with deferred destroy and
* dsl_dataset_user_release_check() hadn't done the necessary
* open context setup. We can also get EBUSY if we're racing
* with destroy and that thread is the ds_owner. Either way
* the busy condition should be transient, and we should retry
* the release operation.
*/
if (error == EBUSY)
goto top;
return (error);
}
/*
* Called at spa_load time (with retry == B_FALSE) to release a stale
* temporary user hold. Also called by the onexit code (with retry == B_TRUE).
*/
int
dsl_dataset_user_release_tmp(dsl_pool_t *dp, uint64_t dsobj, char *htag,
boolean_t retry)
{
dsl_dataset_t *ds;
char *snap;
char *name;
int namelen;
int error;
do {
rw_enter(&dp->dp_config_rwlock, RW_READER);
error = dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds);
rw_exit(&dp->dp_config_rwlock);
if (error)
return (error);
namelen = dsl_dataset_namelen(ds)+1;
name = kmem_alloc(namelen, KM_SLEEP);
dsl_dataset_name(ds, name);
dsl_dataset_rele(ds, FTAG);
snap = strchr(name, '@');
*snap = '\0';
++snap;
error = dsl_dataset_user_release(name, snap, htag, B_FALSE);
kmem_free(name, namelen);
/*
* The object can't have been destroyed because we have a hold,
* but it might have been renamed, resulting in ENOENT. Retry
* if we've been requested to do so.
*
* It would be nice if we could use the dsobj all the way
* through and avoid ENOENT entirely. But we might need to
* unmount the snapshot, and there's currently no way to lookup
* a vfsp using a ZFS object id.
*/
} while ((error == ENOENT) && retry);
return (error);
}
int
dsl_dataset_get_holds(const char *dsname, nvlist_t **nvp)
{
dsl_dataset_t *ds;
int err;
err = dsl_dataset_hold(dsname, FTAG, &ds);
if (err)
return (err);
VERIFY(0 == nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP));
if (ds->ds_phys->ds_userrefs_obj != 0) {
zap_attribute_t *za;
zap_cursor_t zc;
za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
for (zap_cursor_init(&zc, ds->ds_dir->dd_pool->dp_meta_objset,
ds->ds_phys->ds_userrefs_obj);
zap_cursor_retrieve(&zc, za) == 0;
zap_cursor_advance(&zc)) {
VERIFY(0 == nvlist_add_uint64(*nvp, za->za_name,
za->za_first_integer));
}
zap_cursor_fini(&zc);
kmem_free(za, sizeof (zap_attribute_t));
}
dsl_dataset_rele(ds, FTAG);
return (0);
}
/*
* Note, this fuction is used as the callback for dmu_objset_find(). We
* always return 0 so that we will continue to find and process
* inconsistent datasets, even if we encounter an error trying to
* process one of them.
*/
/* ARGSUSED */
int
dsl_destroy_inconsistent(const char *dsname, void *arg)
{
dsl_dataset_t *ds;
if (dsl_dataset_own(dsname, B_TRUE, FTAG, &ds) == 0) {
if (DS_IS_INCONSISTENT(ds))
(void) dsl_dataset_destroy(ds, FTAG, B_FALSE);
else
dsl_dataset_disown(ds, FTAG);
}
return (0);
}
#if defined(_KERNEL) && defined(HAVE_SPL)
EXPORT_SYMBOL(dsl_dataset_hold);
EXPORT_SYMBOL(dsl_dataset_hold_obj);
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_disown);
EXPORT_SYMBOL(dsl_dataset_drop_ref);
EXPORT_SYMBOL(dsl_dataset_tryown);
EXPORT_SYMBOL(dsl_dataset_make_exclusive);
EXPORT_SYMBOL(dsl_dataset_create_sync);
EXPORT_SYMBOL(dsl_dataset_create_sync_dd);
EXPORT_SYMBOL(dsl_dataset_destroy);
EXPORT_SYMBOL(dsl_snapshots_destroy);
EXPORT_SYMBOL(dsl_dataset_destroy_check);
EXPORT_SYMBOL(dsl_dataset_destroy_sync);
EXPORT_SYMBOL(dsl_dataset_snapshot_check);
EXPORT_SYMBOL(dsl_dataset_snapshot_sync);
EXPORT_SYMBOL(dsl_dataset_rename);
EXPORT_SYMBOL(dsl_dataset_promote);
EXPORT_SYMBOL(dsl_dataset_clone_swap);
EXPORT_SYMBOL(dsl_dataset_user_hold);
EXPORT_SYMBOL(dsl_dataset_user_release);
EXPORT_SYMBOL(dsl_dataset_user_release_tmp);
EXPORT_SYMBOL(dsl_dataset_get_holds);
EXPORT_SYMBOL(dsl_dataset_get_blkptr);
EXPORT_SYMBOL(dsl_dataset_set_blkptr);
EXPORT_SYMBOL(dsl_dataset_get_spa);
EXPORT_SYMBOL(dsl_dataset_modified_since_lastsnap);
EXPORT_SYMBOL(dsl_dataset_sync);
EXPORT_SYMBOL(dsl_dataset_block_born);
EXPORT_SYMBOL(dsl_dataset_block_kill);
EXPORT_SYMBOL(dsl_dataset_block_freeable);
EXPORT_SYMBOL(dsl_dataset_prev_snap_txg);
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_set_quota);
EXPORT_SYMBOL(dsl_dataset_set_quota_sync);
EXPORT_SYMBOL(dsl_dataset_set_reservation);
EXPORT_SYMBOL(dsl_destroy_inconsistent);
#endif
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