dmu_objset.c revision 71eb05381846ad14a2087631474e832d0f316654
/*
* 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 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sys/cred.h>
#include <sys/zfs_context.h>
#include <sys/dmu_objset.h>
#include <sys/dsl_dir.h>
#include <sys/dsl_dataset.h>
#include <sys/dsl_prop.h>
#include <sys/dsl_pool.h>
#include <sys/dsl_synctask.h>
#include <sys/dsl_deleg.h>
#include <sys/dnode.h>
#include <sys/dbuf.h>
#include <sys/zvol.h>
#include <sys/dmu_tx.h>
#include <sys/zio_checksum.h>
#include <sys/zap.h>
#include <sys/zil.h>
#include <sys/dmu_impl.h>
#include <sys/zfs_ioctl.h>
spa_t *
dmu_objset_spa(objset_t *os)
{
return (os->os_spa);
}
zilog_t *
dmu_objset_zil(objset_t *os)
{
return (os->os_zil);
}
dsl_pool_t *
dmu_objset_pool(objset_t *os)
{
dsl_dataset_t *ds;
if ((ds = os->os_dsl_dataset) != NULL && ds->ds_dir)
return (ds->ds_dir->dd_pool);
else
return (spa_get_dsl(os->os_spa));
}
dsl_dataset_t *
dmu_objset_ds(objset_t *os)
{
return (os->os_dsl_dataset);
}
dmu_objset_type_t
dmu_objset_type(objset_t *os)
{
return (os->os_phys->os_type);
}
void
dmu_objset_name(objset_t *os, char *buf)
{
dsl_dataset_name(os->os_dsl_dataset, buf);
}
uint64_t
dmu_objset_id(objset_t *os)
{
dsl_dataset_t *ds = os->os_dsl_dataset;
return (ds ? ds->ds_object : 0);
}
uint64_t
dmu_objset_logbias(objset_t *os)
{
return (os->os_logbias);
}
static void
checksum_changed_cb(void *arg, uint64_t newval)
{
objset_t *os = arg;
/*
* Inheritance should have been done by now.
*/
ASSERT(newval != ZIO_CHECKSUM_INHERIT);
os->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE);
}
static void
compression_changed_cb(void *arg, uint64_t newval)
{
objset_t *os = arg;
/*
* Inheritance and range checking should have been done by now.
*/
ASSERT(newval != ZIO_COMPRESS_INHERIT);
os->os_compress = zio_compress_select(newval, ZIO_COMPRESS_ON_VALUE);
}
static void
copies_changed_cb(void *arg, uint64_t newval)
{
objset_t *os = arg;
/*
* Inheritance and range checking should have been done by now.
*/
ASSERT(newval > 0);
ASSERT(newval <= spa_max_replication(os->os_spa));
os->os_copies = newval;
}
static void
primary_cache_changed_cb(void *arg, uint64_t newval)
{
objset_t *os = arg;
/*
* Inheritance and range checking should have been done by now.
*/
ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
newval == ZFS_CACHE_METADATA);
os->os_primary_cache = newval;
}
static void
secondary_cache_changed_cb(void *arg, uint64_t newval)
{
objset_t *os = arg;
/*
* Inheritance and range checking should have been done by now.
*/
ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
newval == ZFS_CACHE_METADATA);
os->os_secondary_cache = newval;
}
static void
logbias_changed_cb(void *arg, uint64_t newval)
{
objset_t *os = arg;
ASSERT(newval == ZFS_LOGBIAS_LATENCY ||
newval == ZFS_LOGBIAS_THROUGHPUT);
os->os_logbias = newval;
if (os->os_zil)
zil_set_logbias(os->os_zil, newval);
}
void
dmu_objset_byteswap(void *buf, size_t size)
{
objset_phys_t *osp = buf;
ASSERT(size == OBJSET_OLD_PHYS_SIZE || size == sizeof (objset_phys_t));
dnode_byteswap(&osp->os_meta_dnode);
byteswap_uint64_array(&osp->os_zil_header, sizeof (zil_header_t));
osp->os_type = BSWAP_64(osp->os_type);
osp->os_flags = BSWAP_64(osp->os_flags);
if (size == sizeof (objset_phys_t)) {
dnode_byteswap(&osp->os_userused_dnode);
dnode_byteswap(&osp->os_groupused_dnode);
}
}
int
dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
objset_t **osp)
{
objset_t *os;
int i, err;
ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock));
os = kmem_zalloc(sizeof (objset_t), KM_SLEEP);
os->os_dsl_dataset = ds;
os->os_spa = spa;
os->os_rootbp = bp;
if (!BP_IS_HOLE(os->os_rootbp)) {
uint32_t aflags = ARC_WAIT;
zbookmark_t zb;
zb.zb_objset = ds ? ds->ds_object : 0;
zb.zb_object = 0;
zb.zb_level = -1;
zb.zb_blkid = 0;
if (DMU_OS_IS_L2CACHEABLE(os))
aflags |= ARC_L2CACHE;
dprintf_bp(os->os_rootbp, "reading %s", "");
/*
* NB: when bprewrite scrub can change the bp,
* and this is called from dmu_objset_open_ds_os, the bp
* could change, and we'll need a lock.
*/
err = arc_read_nolock(NULL, spa, os->os_rootbp,
arc_getbuf_func, &os->os_phys_buf,
ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb);
if (err) {
kmem_free(os, sizeof (objset_t));
/* convert checksum errors into IO errors */
if (err == ECKSUM)
err = EIO;
return (err);
}
/* Increase the blocksize if we are permitted. */
if (spa_version(spa) >= SPA_VERSION_USERSPACE &&
arc_buf_size(os->os_phys_buf) < sizeof (objset_phys_t)) {
arc_buf_t *buf = arc_buf_alloc(spa,
sizeof (objset_phys_t), &os->os_phys_buf,
ARC_BUFC_METADATA);
bzero(buf->b_data, sizeof (objset_phys_t));
bcopy(os->os_phys_buf->b_data, buf->b_data,
arc_buf_size(os->os_phys_buf));
(void) arc_buf_remove_ref(os->os_phys_buf,
&os->os_phys_buf);
os->os_phys_buf = buf;
}
os->os_phys = os->os_phys_buf->b_data;
os->os_flags = os->os_phys->os_flags;
} else {
int size = spa_version(spa) >= SPA_VERSION_USERSPACE ?
sizeof (objset_phys_t) : OBJSET_OLD_PHYS_SIZE;
os->os_phys_buf = arc_buf_alloc(spa, size,
&os->os_phys_buf, ARC_BUFC_METADATA);
os->os_phys = os->os_phys_buf->b_data;
bzero(os->os_phys, size);
}
/*
* Note: the changed_cb will be called once before the register
* func returns, thus changing the checksum/compression from the
* default (fletcher2/off). Snapshots don't need to know about
* checksum/compression/copies.
*/
if (ds) {
err = dsl_prop_register(ds, "primarycache",
primary_cache_changed_cb, os);
if (err == 0)
err = dsl_prop_register(ds, "secondarycache",
secondary_cache_changed_cb, os);
if (!dsl_dataset_is_snapshot(ds)) {
if (err == 0)
err = dsl_prop_register(ds, "checksum",
checksum_changed_cb, os);
if (err == 0)
err = dsl_prop_register(ds, "compression",
compression_changed_cb, os);
if (err == 0)
err = dsl_prop_register(ds, "copies",
copies_changed_cb, os);
if (err == 0)
err = dsl_prop_register(ds, "logbias",
logbias_changed_cb, os);
}
if (err) {
VERIFY(arc_buf_remove_ref(os->os_phys_buf,
&os->os_phys_buf) == 1);
kmem_free(os, sizeof (objset_t));
return (err);
}
} else if (ds == NULL) {
/* It's the meta-objset. */
os->os_checksum = ZIO_CHECKSUM_FLETCHER_4;
os->os_compress = ZIO_COMPRESS_LZJB;
os->os_copies = spa_max_replication(spa);
os->os_primary_cache = ZFS_CACHE_ALL;
os->os_secondary_cache = ZFS_CACHE_ALL;
}
os->os_zil_header = os->os_phys->os_zil_header;
os->os_zil = zil_alloc(os, &os->os_zil_header);
for (i = 0; i < TXG_SIZE; i++) {
list_create(&os->os_dirty_dnodes[i], sizeof (dnode_t),
offsetof(dnode_t, dn_dirty_link[i]));
list_create(&os->os_free_dnodes[i], sizeof (dnode_t),
offsetof(dnode_t, dn_dirty_link[i]));
}
list_create(&os->os_dnodes, sizeof (dnode_t),
offsetof(dnode_t, dn_link));
list_create(&os->os_downgraded_dbufs, sizeof (dmu_buf_impl_t),
offsetof(dmu_buf_impl_t, db_link));
mutex_init(&os->os_lock, NULL, MUTEX_DEFAULT, NULL);
mutex_init(&os->os_obj_lock, NULL, MUTEX_DEFAULT, NULL);
mutex_init(&os->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL);
os->os_meta_dnode = dnode_special_open(os,
&os->os_phys->os_meta_dnode, DMU_META_DNODE_OBJECT);
if (arc_buf_size(os->os_phys_buf) >= sizeof (objset_phys_t)) {
os->os_userused_dnode = dnode_special_open(os,
&os->os_phys->os_userused_dnode, DMU_USERUSED_OBJECT);
os->os_groupused_dnode = dnode_special_open(os,
&os->os_phys->os_groupused_dnode, DMU_GROUPUSED_OBJECT);
}
/*
* We should be the only thread trying to do this because we
* have ds_opening_lock
*/
if (ds) {
mutex_enter(&ds->ds_lock);
ASSERT(ds->ds_objset == NULL);
ds->ds_objset = os;
mutex_exit(&ds->ds_lock);
}
*osp = os;
return (0);
}
int
dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp)
{
int err = 0;
mutex_enter(&ds->ds_opening_lock);
*osp = ds->ds_objset;
if (*osp == NULL) {
err = dmu_objset_open_impl(dsl_dataset_get_spa(ds),
ds, &ds->ds_phys->ds_bp, osp);
}
mutex_exit(&ds->ds_opening_lock);
return (err);
}
/* called from zpl */
int
dmu_objset_hold(const char *name, void *tag, objset_t **osp)
{
dsl_dataset_t *ds;
int err;
err = dsl_dataset_hold(name, tag, &ds);
if (err)
return (err);
err = dmu_objset_from_ds(ds, osp);
if (err)
dsl_dataset_rele(ds, tag);
return (err);
}
/* called from zpl */
int
dmu_objset_own(const char *name, dmu_objset_type_t type,
boolean_t readonly, void *tag, objset_t **osp)
{
dsl_dataset_t *ds;
int err;
err = dsl_dataset_own(name, B_FALSE, tag, &ds);
if (err)
return (err);
err = dmu_objset_from_ds(ds, osp);
if (err) {
dsl_dataset_disown(ds, tag);
} else if ((type != DMU_OST_ANY && type != (*osp)->os_phys->os_type) ||
(!readonly && dsl_dataset_is_snapshot(ds))) {
dmu_objset_disown(*osp, tag);
return (EINVAL);
}
return (err);
}
void
dmu_objset_rele(objset_t *os, void *tag)
{
dsl_dataset_rele(os->os_dsl_dataset, tag);
}
void
dmu_objset_disown(objset_t *os, void *tag)
{
dsl_dataset_disown(os->os_dsl_dataset, tag);
}
int
dmu_objset_evict_dbufs(objset_t *os)
{
dnode_t *dn;
mutex_enter(&os->os_lock);
/* process the mdn last, since the other dnodes have holds on it */
list_remove(&os->os_dnodes, os->os_meta_dnode);
list_insert_tail(&os->os_dnodes, os->os_meta_dnode);
/*
* Find the first dnode with holds. We have to do this dance
* because dnode_add_ref() only works if you already have a
* hold. If there are no holds then it has no dbufs so OK to
* skip.
*/
for (dn = list_head(&os->os_dnodes);
dn && !dnode_add_ref(dn, FTAG);
dn = list_next(&os->os_dnodes, dn))
continue;
while (dn) {
dnode_t *next_dn = dn;
do {
next_dn = list_next(&os->os_dnodes, next_dn);
} while (next_dn && !dnode_add_ref(next_dn, FTAG));
mutex_exit(&os->os_lock);
dnode_evict_dbufs(dn);
dnode_rele(dn, FTAG);
mutex_enter(&os->os_lock);
dn = next_dn;
}
mutex_exit(&os->os_lock);
return (list_head(&os->os_dnodes) != os->os_meta_dnode);
}
void
dmu_objset_evict(objset_t *os)
{
dsl_dataset_t *ds = os->os_dsl_dataset;
int i;
for (i = 0; i < TXG_SIZE; i++) {
ASSERT(list_head(&os->os_dirty_dnodes[i]) == NULL);
ASSERT(list_head(&os->os_free_dnodes[i]) == NULL);
}
if (ds) {
if (!dsl_dataset_is_snapshot(ds)) {
VERIFY(0 == dsl_prop_unregister(ds, "checksum",
checksum_changed_cb, os));
VERIFY(0 == dsl_prop_unregister(ds, "compression",
compression_changed_cb, os));
VERIFY(0 == dsl_prop_unregister(ds, "copies",
copies_changed_cb, os));
VERIFY(0 == dsl_prop_unregister(ds, "logbias",
logbias_changed_cb, os));
}
VERIFY(0 == dsl_prop_unregister(ds, "primarycache",
primary_cache_changed_cb, os));
VERIFY(0 == dsl_prop_unregister(ds, "secondarycache",
secondary_cache_changed_cb, os));
}
/*
* We should need only a single pass over the dnode list, since
* nothing can be added to the list at this point.
*/
(void) dmu_objset_evict_dbufs(os);
dnode_special_close(os->os_meta_dnode);
if (os->os_userused_dnode) {
dnode_special_close(os->os_userused_dnode);
dnode_special_close(os->os_groupused_dnode);
}
zil_free(os->os_zil);
ASSERT3P(list_head(&os->os_dnodes), ==, NULL);
VERIFY(arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf) == 1);
mutex_destroy(&os->os_lock);
mutex_destroy(&os->os_obj_lock);
mutex_destroy(&os->os_user_ptr_lock);
kmem_free(os, sizeof (objset_t));
}
timestruc_t
dmu_objset_snap_cmtime(objset_t *os)
{
return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir));
}
/* called from dsl for meta-objset */
objset_t *
dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
dmu_objset_type_t type, dmu_tx_t *tx)
{
objset_t *os;
dnode_t *mdn;
ASSERT(dmu_tx_is_syncing(tx));
if (ds)
mutex_enter(&ds->ds_opening_lock);
VERIFY(0 == dmu_objset_open_impl(spa, ds, bp, &os));
if (ds)
mutex_exit(&ds->ds_opening_lock);
mdn = os->os_meta_dnode;
dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT,
DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx);
/*
* We don't want to have to increase the meta-dnode's nlevels
* later, because then we could do it in quescing context while
* we are also accessing it in open context.
*
* This precaution is not necessary for the MOS (ds == NULL),
* because the MOS is only updated in syncing context.
* This is most fortunate: the MOS is the only objset that
* needs to be synced multiple times as spa_sync() iterates
* to convergence, so minimizing its dn_nlevels matters.
*/
if (ds != NULL) {
int levels = 1;
/*
* Determine the number of levels necessary for the meta-dnode
* to contain DN_MAX_OBJECT dnodes.
*/
while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift +
(levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) <
DN_MAX_OBJECT * sizeof (dnode_phys_t))
levels++;
mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] =
mdn->dn_nlevels = levels;
}
ASSERT(type != DMU_OST_NONE);
ASSERT(type != DMU_OST_ANY);
ASSERT(type < DMU_OST_NUMTYPES);
os->os_phys->os_type = type;
if (dmu_objset_userused_enabled(os)) {
os->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE;
os->os_flags = os->os_phys->os_flags;
}
dsl_dataset_dirty(ds, tx);
return (os);
}
struct oscarg {
void (*userfunc)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx);
void *userarg;
dsl_dataset_t *clone_origin;
const char *lastname;
dmu_objset_type_t type;
uint64_t flags;
};
/*ARGSUSED*/
static int
dmu_objset_create_check(void *arg1, void *arg2, dmu_tx_t *tx)
{
dsl_dir_t *dd = arg1;
struct oscarg *oa = arg2;
objset_t *mos = dd->dd_pool->dp_meta_objset;
int err;
uint64_t ddobj;
err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj,
oa->lastname, sizeof (uint64_t), 1, &ddobj);
if (err != ENOENT)
return (err ? err : EEXIST);
if (oa->clone_origin != NULL) {
/* You can't clone across pools. */
if (oa->clone_origin->ds_dir->dd_pool != dd->dd_pool)
return (EXDEV);
/* You can only clone snapshots, not the head datasets. */
if (!dsl_dataset_is_snapshot(oa->clone_origin))
return (EINVAL);
}
return (0);
}
static void
dmu_objset_create_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx)
{
dsl_dir_t *dd = arg1;
struct oscarg *oa = arg2;
uint64_t dsobj;
ASSERT(dmu_tx_is_syncing(tx));
dsobj = dsl_dataset_create_sync(dd, oa->lastname,
oa->clone_origin, oa->flags, cr, tx);
if (oa->clone_origin == NULL) {
dsl_dataset_t *ds;
blkptr_t *bp;
objset_t *os;
VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool, dsobj,
FTAG, &ds));
bp = dsl_dataset_get_blkptr(ds);
ASSERT(BP_IS_HOLE(bp));
os = dmu_objset_create_impl(dsl_dataset_get_spa(ds),
ds, bp, oa->type, tx);
if (oa->userfunc)
oa->userfunc(os, oa->userarg, cr, tx);
dsl_dataset_rele(ds, FTAG);
}
spa_history_internal_log(LOG_DS_CREATE, dd->dd_pool->dp_spa,
tx, cr, "dataset = %llu", dsobj);
}
int
dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags,
void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg)
{
dsl_dir_t *pdd;
const char *tail;
int err = 0;
struct oscarg oa = { 0 };
ASSERT(strchr(name, '@') == NULL);
err = dsl_dir_open(name, FTAG, &pdd, &tail);
if (err)
return (err);
if (tail == NULL) {
dsl_dir_close(pdd, FTAG);
return (EEXIST);
}
oa.userfunc = func;
oa.userarg = arg;
oa.lastname = tail;
oa.type = type;
oa.flags = flags;
err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check,
dmu_objset_create_sync, pdd, &oa, 5);
dsl_dir_close(pdd, FTAG);
return (err);
}
int
dmu_objset_clone(const char *name, dsl_dataset_t *clone_origin, uint64_t flags)
{
dsl_dir_t *pdd;
const char *tail;
int err = 0;
struct oscarg oa = { 0 };
ASSERT(strchr(name, '@') == NULL);
err = dsl_dir_open(name, FTAG, &pdd, &tail);
if (err)
return (err);
if (tail == NULL) {
dsl_dir_close(pdd, FTAG);
return (EEXIST);
}
oa.lastname = tail;
oa.clone_origin = clone_origin;
oa.flags = flags;
err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check,
dmu_objset_create_sync, pdd, &oa, 5);
dsl_dir_close(pdd, FTAG);
return (err);
}
int
dmu_objset_destroy(const char *name, boolean_t defer)
{
dsl_dataset_t *ds;
int error;
/*
* dsl_dataset_destroy() can free any claimed-but-unplayed
* intent log, but if there is an active log, it has blocks that
* are allocated, but may not yet be reflected in the on-disk
* structure. Only the ZIL knows how to free them, so we have
* to call into it here.
*/
error = dsl_dataset_own(name, B_TRUE, FTAG, &ds);
if (error == 0) {
objset_t *os;
if (dmu_objset_from_ds(ds, &os) == 0)
zil_destroy(dmu_objset_zil(os), B_FALSE);
error = dsl_dataset_destroy(ds, FTAG, defer);
/* dsl_dataset_destroy() closes the ds. */
}
return (error);
}
struct snaparg {
dsl_sync_task_group_t *dstg;
char *snapname;
char failed[MAXPATHLEN];
boolean_t checkperms;
nvlist_t *props;
};
static int
snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx)
{
objset_t *os = arg1;
struct snaparg *sn = arg2;
/* The props have already been checked by zfs_check_userprops(). */
return (dsl_dataset_snapshot_check(os->os_dsl_dataset,
sn->snapname, tx));
}
static void
snapshot_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx)
{
objset_t *os = arg1;
dsl_dataset_t *ds = os->os_dsl_dataset;
struct snaparg *sn = arg2;
dsl_dataset_snapshot_sync(ds, sn->snapname, cr, tx);
if (sn->props)
dsl_props_set_sync(ds->ds_prev, sn->props, cr, tx);
}
static int
dmu_objset_snapshot_one(char *name, void *arg)
{
struct snaparg *sn = arg;
objset_t *os;
int err;
(void) strcpy(sn->failed, name);
/*
* Check permissions only when requested. This only applies when
* doing a recursive snapshot. The permission checks for the starting
* dataset have already been performed in zfs_secpolicy_snapshot()
*/
if (sn->checkperms == B_TRUE &&
(err = zfs_secpolicy_snapshot_perms(name, CRED())))
return (err);
err = dmu_objset_hold(name, sn, &os);
if (err != 0)
return (err);
/* If the objset is in an inconsistent state, return busy */
if (os->os_dsl_dataset->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) {
dmu_objset_rele(os, sn);
return (EBUSY);
}
/*
* NB: we need to wait for all in-flight changes to get to disk,
* so that we snapshot those changes. zil_suspend does this as
* a side effect.
*/
err = zil_suspend(dmu_objset_zil(os));
if (err == 0) {
dsl_sync_task_create(sn->dstg, snapshot_check,
snapshot_sync, os, sn, 3);
} else {
dmu_objset_rele(os, sn);
}
return (err);
}
int
dmu_objset_snapshot(char *fsname, char *snapname,
nvlist_t *props, boolean_t recursive)
{
dsl_sync_task_t *dst;
struct snaparg sn;
spa_t *spa;
int err;
(void) strcpy(sn.failed, fsname);
err = spa_open(fsname, &spa, FTAG);
if (err)
return (err);
sn.dstg = dsl_sync_task_group_create(spa_get_dsl(spa));
sn.snapname = snapname;
sn.props = props;
if (recursive) {
sn.checkperms = B_TRUE;
err = dmu_objset_find(fsname,
dmu_objset_snapshot_one, &sn, DS_FIND_CHILDREN);
} else {
sn.checkperms = B_FALSE;
err = dmu_objset_snapshot_one(fsname, &sn);
}
if (err == 0)
err = dsl_sync_task_group_wait(sn.dstg);
for (dst = list_head(&sn.dstg->dstg_tasks); dst;
dst = list_next(&sn.dstg->dstg_tasks, dst)) {
objset_t *os = dst->dst_arg1;
dsl_dataset_t *ds = os->os_dsl_dataset;
if (dst->dst_err)
dsl_dataset_name(ds, sn.failed);
zil_resume(dmu_objset_zil(os));
dmu_objset_rele(os, &sn);
}
if (err)
(void) strcpy(fsname, sn.failed);
dsl_sync_task_group_destroy(sn.dstg);
spa_close(spa, FTAG);
return (err);
}
static void
dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx)
{
dnode_t *dn;
while (dn = list_head(list)) {
ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT);
ASSERT(dn->dn_dbuf->db_data_pending);
/*
* Initialize dn_zio outside dnode_sync() because the
* meta-dnode needs to set it ouside dnode_sync().
*/
dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio;
ASSERT(dn->dn_zio);
ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS);
list_remove(list, dn);
if (newlist) {
(void) dnode_add_ref(dn, newlist);
list_insert_tail(newlist, dn);
}
dnode_sync(dn, tx);
}
}
/* ARGSUSED */
static void
ready(zio_t *zio, arc_buf_t *abuf, void *arg)
{
blkptr_t *bp = zio->io_bp;
blkptr_t *bp_orig = &zio->io_bp_orig;
objset_t *os = arg;
dnode_phys_t *dnp = &os->os_phys->os_meta_dnode;
ASSERT(bp == os->os_rootbp);
ASSERT(BP_GET_TYPE(bp) == DMU_OT_OBJSET);
ASSERT(BP_GET_LEVEL(bp) == 0);
/*
* Update rootbp fill count: it should be the number of objects
* allocated in the object set (not counting the "special"
* objects that are stored in the objset_phys_t -- the meta
* dnode and user/group accounting objects).
*/
bp->blk_fill = 0;
for (int i = 0; i < dnp->dn_nblkptr; i++)
bp->blk_fill += dnp->dn_blkptr[i].blk_fill;
if (zio->io_flags & ZIO_FLAG_IO_REWRITE) {
ASSERT(DVA_EQUAL(BP_IDENTITY(bp), BP_IDENTITY(bp_orig)));
} else {
if (zio->io_bp_orig.blk_birth == os->os_synctx->tx_txg)
(void) dsl_dataset_block_kill(os->os_dsl_dataset,
&zio->io_bp_orig, zio, os->os_synctx);
dsl_dataset_block_born(os->os_dsl_dataset, bp, os->os_synctx);
}
}
/* called from dsl */
void
dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx)
{
int txgoff;
zbookmark_t zb;
writeprops_t wp = { 0 };
zio_t *zio;
list_t *list;
list_t *newlist = NULL;
dbuf_dirty_record_t *dr;
dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg);
ASSERT(dmu_tx_is_syncing(tx));
/* XXX the write_done callback should really give us the tx... */
os->os_synctx = tx;
if (os->os_dsl_dataset == NULL) {
/*
* This is the MOS. If we have upgraded,
* spa_max_replication() could change, so reset
* os_copies here.
*/
os->os_copies = spa_max_replication(os->os_spa);
}
/*
* Create the root block IO
*/
zb.zb_objset = os->os_dsl_dataset ? os->os_dsl_dataset->ds_object : 0;
zb.zb_object = 0;
zb.zb_level = -1; /* for block ordering; it's level 0 on disk */
zb.zb_blkid = 0;
wp.wp_type = DMU_OT_OBJSET;
wp.wp_level = 0; /* on-disk BP level; see above */
wp.wp_copies = os->os_copies;
wp.wp_oschecksum = os->os_checksum;
wp.wp_oscompress = os->os_compress;
if (BP_IS_OLDER(os->os_rootbp, tx->tx_txg)) {
(void) dsl_dataset_block_kill(os->os_dsl_dataset,
os->os_rootbp, pio, tx);
}
arc_release(os->os_phys_buf, &os->os_phys_buf);
zio = arc_write(pio, os->os_spa, &wp, DMU_OS_IS_L2CACHEABLE(os),
tx->tx_txg, os->os_rootbp, os->os_phys_buf, ready, NULL, os,
ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb);
/*
* Sync special dnodes - the parent IO for the sync is the root block
*/
os->os_meta_dnode->dn_zio = zio;
dnode_sync(os->os_meta_dnode, tx);
os->os_phys->os_flags = os->os_flags;
if (os->os_userused_dnode &&
os->os_userused_dnode->dn_type != DMU_OT_NONE) {
os->os_userused_dnode->dn_zio = zio;
dnode_sync(os->os_userused_dnode, tx);
os->os_groupused_dnode->dn_zio = zio;
dnode_sync(os->os_groupused_dnode, tx);
}
txgoff = tx->tx_txg & TXG_MASK;
if (dmu_objset_userused_enabled(os)) {
newlist = &os->os_synced_dnodes;
/*
* We must create the list here because it uses the
* dn_dirty_link[] of this txg.
*/
list_create(newlist, sizeof (dnode_t),
offsetof(dnode_t, dn_dirty_link[txgoff]));
}
dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], newlist, tx);
dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx);
list = &os->os_meta_dnode->dn_dirty_records[txgoff];
while (dr = list_head(list)) {
ASSERT(dr->dr_dbuf->db_level == 0);
list_remove(list, dr);
if (dr->dr_zio)
zio_nowait(dr->dr_zio);
}
/*
* Free intent log blocks up to this tx.
*/
zil_sync(os->os_zil, tx);
os->os_phys->os_zil_header = os->os_zil_header;
zio_nowait(zio);
}
static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES];
void
dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb)
{
used_cbs[ost] = cb;
}
boolean_t
dmu_objset_userused_enabled(objset_t *os)
{
return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE &&
used_cbs[os->os_phys->os_type] &&
os->os_userused_dnode);
}
void
dmu_objset_do_userquota_callbacks(objset_t *os, dmu_tx_t *tx)
{
dnode_t *dn;
list_t *list = &os->os_synced_dnodes;
static const char zerobuf[DN_MAX_BONUSLEN] = {0};
ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os));
while (dn = list_head(list)) {
dmu_object_type_t bonustype;
ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object));
ASSERT(dn->dn_oldphys);
ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE ||
dn->dn_phys->dn_flags &
DNODE_FLAG_USERUSED_ACCOUNTED);
/* Allocate the user/groupused objects if necessary. */
if (os->os_userused_dnode->dn_type == DMU_OT_NONE) {
VERIFY(0 == zap_create_claim(os,
DMU_USERUSED_OBJECT,
DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx));
VERIFY(0 == zap_create_claim(os,
DMU_GROUPUSED_OBJECT,
DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx));
}
/*
* If the object was not previously
* accounted, pretend that it was free.
*/
if (!(dn->dn_oldphys->dn_flags &
DNODE_FLAG_USERUSED_ACCOUNTED)) {
bzero(dn->dn_oldphys, sizeof (dnode_phys_t));
}
/*
* If the object was freed, use the previous bonustype.
*/
bonustype = dn->dn_phys->dn_bonustype ?
dn->dn_phys->dn_bonustype : dn->dn_oldphys->dn_bonustype;
ASSERT(dn->dn_phys->dn_type != 0 ||
(bcmp(DN_BONUS(dn->dn_phys), zerobuf,
DN_MAX_BONUSLEN) == 0 &&
DN_USED_BYTES(dn->dn_phys) == 0));
ASSERT(dn->dn_oldphys->dn_type != 0 ||
(bcmp(DN_BONUS(dn->dn_oldphys), zerobuf,
DN_MAX_BONUSLEN) == 0 &&
DN_USED_BYTES(dn->dn_oldphys) == 0));
used_cbs[os->os_phys->os_type](os, bonustype,
DN_BONUS(dn->dn_oldphys), DN_BONUS(dn->dn_phys),
DN_USED_BYTES(dn->dn_oldphys),
DN_USED_BYTES(dn->dn_phys), tx);
/*
* The mutex is needed here for interlock with dnode_allocate.
*/
mutex_enter(&dn->dn_mtx);
zio_buf_free(dn->dn_oldphys, sizeof (dnode_phys_t));
dn->dn_oldphys = NULL;
mutex_exit(&dn->dn_mtx);
list_remove(list, dn);
dnode_rele(dn, list);
}
}
boolean_t
dmu_objset_userspace_present(objset_t *os)
{
return (os->os_phys->os_flags &
OBJSET_FLAG_USERACCOUNTING_COMPLETE);
}
int
dmu_objset_userspace_upgrade(objset_t *os)
{
uint64_t obj;
int err = 0;
if (dmu_objset_userspace_present(os))
return (0);
if (!dmu_objset_userused_enabled(os))
return (ENOTSUP);
if (dmu_objset_is_snapshot(os))
return (EINVAL);
/*
* We simply need to mark every object dirty, so that it will be
* synced out and now accounted. If this is called
* concurrently, or if we already did some work before crashing,
* that's fine, since we track each object's accounted state
* independently.
*/
for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) {
dmu_tx_t *tx;
dmu_buf_t *db;
int objerr;
if (issig(JUSTLOOKING) && issig(FORREAL))
return (EINTR);
objerr = dmu_bonus_hold(os, obj, FTAG, &db);
if (objerr)
continue;
tx = dmu_tx_create(os);
dmu_tx_hold_bonus(tx, obj);
objerr = dmu_tx_assign(tx, TXG_WAIT);
if (objerr) {
dmu_tx_abort(tx);
continue;
}
dmu_buf_will_dirty(db, tx);
dmu_buf_rele(db, FTAG);
dmu_tx_commit(tx);
}
os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE;
txg_wait_synced(dmu_objset_pool(os), 0);
return (0);
}
void
dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp,
uint64_t *usedobjsp, uint64_t *availobjsp)
{
dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp,
usedobjsp, availobjsp);
}
uint64_t
dmu_objset_fsid_guid(objset_t *os)
{
return (dsl_dataset_fsid_guid(os->os_dsl_dataset));
}
void
dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat)
{
stat->dds_type = os->os_phys->os_type;
if (os->os_dsl_dataset)
dsl_dataset_fast_stat(os->os_dsl_dataset, stat);
}
void
dmu_objset_stats(objset_t *os, nvlist_t *nv)
{
ASSERT(os->os_dsl_dataset ||
os->os_phys->os_type == DMU_OST_META);
if (os->os_dsl_dataset != NULL)
dsl_dataset_stats(os->os_dsl_dataset, nv);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE,
os->os_phys->os_type);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING,
dmu_objset_userspace_present(os));
}
int
dmu_objset_is_snapshot(objset_t *os)
{
if (os->os_dsl_dataset != NULL)
return (dsl_dataset_is_snapshot(os->os_dsl_dataset));
else
return (B_FALSE);
}
int
dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen,
boolean_t *conflict)
{
dsl_dataset_t *ds = os->os_dsl_dataset;
uint64_t ignored;
if (ds->ds_phys->ds_snapnames_zapobj == 0)
return (ENOENT);
return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset,
ds->ds_phys->ds_snapnames_zapobj, name, 8, 1, &ignored, MT_FIRST,
real, maxlen, conflict));
}
int
dmu_snapshot_list_next(objset_t *os, int namelen, char *name,
uint64_t *idp, uint64_t *offp, boolean_t *case_conflict)
{
dsl_dataset_t *ds = os->os_dsl_dataset;
zap_cursor_t cursor;
zap_attribute_t attr;
if (ds->ds_phys->ds_snapnames_zapobj == 0)
return (ENOENT);
zap_cursor_init_serialized(&cursor,
ds->ds_dir->dd_pool->dp_meta_objset,
ds->ds_phys->ds_snapnames_zapobj, *offp);
if (zap_cursor_retrieve(&cursor, &attr) != 0) {
zap_cursor_fini(&cursor);
return (ENOENT);
}
if (strlen(attr.za_name) + 1 > namelen) {
zap_cursor_fini(&cursor);
return (ENAMETOOLONG);
}
(void) strcpy(name, attr.za_name);
if (idp)
*idp = attr.za_first_integer;
if (case_conflict)
*case_conflict = attr.za_normalization_conflict;
zap_cursor_advance(&cursor);
*offp = zap_cursor_serialize(&cursor);
zap_cursor_fini(&cursor);
return (0);
}
int
dmu_dir_list_next(objset_t *os, int namelen, char *name,
uint64_t *idp, uint64_t *offp)
{
dsl_dir_t *dd = os->os_dsl_dataset->ds_dir;
zap_cursor_t cursor;
zap_attribute_t attr;
/* there is no next dir on a snapshot! */
if (os->os_dsl_dataset->ds_object !=
dd->dd_phys->dd_head_dataset_obj)
return (ENOENT);
zap_cursor_init_serialized(&cursor,
dd->dd_pool->dp_meta_objset,
dd->dd_phys->dd_child_dir_zapobj, *offp);
if (zap_cursor_retrieve(&cursor, &attr) != 0) {
zap_cursor_fini(&cursor);
return (ENOENT);
}
if (strlen(attr.za_name) + 1 > namelen) {
zap_cursor_fini(&cursor);
return (ENAMETOOLONG);
}
(void) strcpy(name, attr.za_name);
if (idp)
*idp = attr.za_first_integer;
zap_cursor_advance(&cursor);
*offp = zap_cursor_serialize(&cursor);
zap_cursor_fini(&cursor);
return (0);
}
struct findarg {
int (*func)(char *, void *);
void *arg;
};
/* ARGSUSED */
static int
findfunc(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg)
{
struct findarg *fa = arg;
return (fa->func((char *)dsname, fa->arg));
}
/*
* Find all objsets under name, and for each, call 'func(child_name, arg)'.
* Perhaps change all callers to use dmu_objset_find_spa()?
*/
int
dmu_objset_find(char *name, int func(char *, void *), void *arg, int flags)
{
struct findarg fa;
fa.func = func;
fa.arg = arg;
return (dmu_objset_find_spa(NULL, name, findfunc, &fa, flags));
}
/*
* Find all objsets under name, call func on each
*/
int
dmu_objset_find_spa(spa_t *spa, const char *name,
int func(spa_t *, uint64_t, const char *, void *), void *arg, int flags)
{
dsl_dir_t *dd;
dsl_pool_t *dp;
dsl_dataset_t *ds;
zap_cursor_t zc;
zap_attribute_t *attr;
char *child;
uint64_t thisobj;
int err;
if (name == NULL)
name = spa_name(spa);
err = dsl_dir_open_spa(spa, name, FTAG, &dd, NULL);
if (err)
return (err);
/* Don't visit hidden ($MOS & $ORIGIN) objsets. */
if (dd->dd_myname[0] == '$') {
dsl_dir_close(dd, FTAG);
return (0);
}
thisobj = dd->dd_phys->dd_head_dataset_obj;
attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
dp = dd->dd_pool;
/*
* Iterate over all children.
*/
if (flags & DS_FIND_CHILDREN) {
for (zap_cursor_init(&zc, dp->dp_meta_objset,
dd->dd_phys->dd_child_dir_zapobj);
zap_cursor_retrieve(&zc, attr) == 0;
(void) zap_cursor_advance(&zc)) {
ASSERT(attr->za_integer_length == sizeof (uint64_t));
ASSERT(attr->za_num_integers == 1);
child = kmem_alloc(MAXPATHLEN, KM_SLEEP);
(void) strcpy(child, name);
(void) strcat(child, "/");
(void) strcat(child, attr->za_name);
err = dmu_objset_find_spa(spa, child, func, arg, flags);
kmem_free(child, MAXPATHLEN);
if (err)
break;
}
zap_cursor_fini(&zc);
if (err) {
dsl_dir_close(dd, FTAG);
kmem_free(attr, sizeof (zap_attribute_t));
return (err);
}
}
/*
* Iterate over all snapshots.
*/
if (flags & DS_FIND_SNAPSHOTS) {
if (!dsl_pool_sync_context(dp))
rw_enter(&dp->dp_config_rwlock, RW_READER);
err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
if (!dsl_pool_sync_context(dp))
rw_exit(&dp->dp_config_rwlock);
if (err == 0) {
uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj;
dsl_dataset_rele(ds, FTAG);
for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj);
zap_cursor_retrieve(&zc, attr) == 0;
(void) zap_cursor_advance(&zc)) {
ASSERT(attr->za_integer_length ==
sizeof (uint64_t));
ASSERT(attr->za_num_integers == 1);
child = kmem_alloc(MAXPATHLEN, KM_SLEEP);
(void) strcpy(child, name);
(void) strcat(child, "@");
(void) strcat(child, attr->za_name);
err = func(spa, attr->za_first_integer,
child, arg);
kmem_free(child, MAXPATHLEN);
if (err)
break;
}
zap_cursor_fini(&zc);
}
}
dsl_dir_close(dd, FTAG);
kmem_free(attr, sizeof (zap_attribute_t));
if (err)
return (err);
/*
* Apply to self if appropriate.
*/
err = func(spa, thisobj, name, arg);
return (err);
}
/* ARGSUSED */
int
dmu_objset_prefetch(char *name, void *arg)
{
dsl_dataset_t *ds;
if (dsl_dataset_hold(name, FTAG, &ds))
return (0);
if (!BP_IS_HOLE(&ds->ds_phys->ds_bp)) {
mutex_enter(&ds->ds_opening_lock);
if (ds->ds_objset == NULL) {
uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH;
zbookmark_t zb;
zb.zb_objset = ds->ds_object;
zb.zb_object = 0;
zb.zb_level = -1;
zb.zb_blkid = 0;
(void) arc_read_nolock(NULL, dsl_dataset_get_spa(ds),
&ds->ds_phys->ds_bp, NULL, NULL,
ZIO_PRIORITY_ASYNC_READ,
ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE,
&aflags, &zb);
}
mutex_exit(&ds->ds_opening_lock);
}
dsl_dataset_rele(ds, FTAG);
return (0);
}
void
dmu_objset_set_user(objset_t *os, void *user_ptr)
{
ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
os->os_user_ptr = user_ptr;
}
void *
dmu_objset_get_user(objset_t *os)
{
ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
return (os->os_user_ptr);
}