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freebsd-dev/module/zfs/dmu_objset.c
Richard Yao b8d06fca08 Switch KM_SLEEP to KM_PUSHPAGE 
Differences between how paging is done on Solaris and Linux can cause
deadlocks if KM_SLEEP is used in any the following contexts.

  * The txg_sync thread
  * The zvol write/discard threads
  * The zpl_putpage() VFS callback

This is because KM_SLEEP will allow for direct reclaim which may result
in the VM calling back in to the filesystem or block layer to write out
pages.  If a lock is held over this operation the potential exists to
deadlock the system.  To ensure forward progress all memory allocations
in these contexts must us KM_PUSHPAGE which disables performing any I/O
to accomplish the memory allocation.

Previously, this behavior was acheived by setting PF_MEMALLOC on the
thread.  However, that resulted in unexpected side effects such as the
exhaustion of pages in ZONE_DMA.  This approach touchs more of the zfs
code, but it is more consistent with the right way to handle these cases
under Linux.

This is patch lays the ground work for being able to safely revert the
following commits which used PF_MEMALLOC:

  21ade34 Disable direct reclaim for z_wr_* threads
  cfc9a5c Fix zpl_writepage() deadlock
  eec8164 Fix ASSERTION(!dsl_pool_sync_context(tx->tx_pool))

Signed-off-by: Richard Yao <ryao@cs.stonybrook.edu>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #726
2012-08-27 12:01:37 -07:00

1874 lines
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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.
*/
/* Portions Copyright 2010 Robert Milkowski */
#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/zap.h>
#include <sys/zil.h>
#include <sys/dmu_impl.h>
#include <sys/zfs_ioctl.h>
#include <sys/sa.h>
#include <sys/zfs_onexit.h>
/*
* Needed to close a window in dnode_move() that allows the objset to be freed
* before it can be safely accessed.
*/
krwlock_t os_lock;
void
dmu_objset_init(void)
{
rw_init(&os_lock, NULL, RW_DEFAULT, NULL);
}
void
dmu_objset_fini(void)
{
rw_destroy(&os_lock);
}
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_syncprop(objset_t *os)
{
return (os->os_sync);
}
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
dedup_changed_cb(void *arg, uint64_t newval)
{
objset_t *os = arg;
spa_t *spa = os->os_spa;
enum zio_checksum checksum;
/*
* Inheritance should have been done by now.
*/
ASSERT(newval != ZIO_CHECKSUM_INHERIT);
checksum = zio_checksum_dedup_select(spa, newval, ZIO_CHECKSUM_OFF);
os->os_dedup_checksum = checksum & ZIO_CHECKSUM_MASK;
os->os_dedup_verify = !!(checksum & ZIO_CHECKSUM_VERIFY);
}
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
sync_changed_cb(void *arg, uint64_t newval)
{
objset_t *os = arg;
/*
* Inheritance and range checking should have been done by now.
*/
ASSERT(newval == ZFS_SYNC_STANDARD || newval == ZFS_SYNC_ALWAYS ||
newval == ZFS_SYNC_DISABLED);
os->os_sync = newval;
if (os->os_zil)
zil_set_sync(os->os_zil, 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_PUSHPAGE);
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;
SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET,
ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
if (DMU_OS_IS_L2CACHEABLE(os))
aflags |= ARC_L2CACHE;
dprintf_bp(os->os_rootbp, "reading %s", "");
/*
* XXX 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 = dsl_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, "dedup",
dedup_changed_cb, os);
if (err == 0)
err = dsl_prop_register(ds, "logbias",
logbias_changed_cb, os);
if (err == 0)
err = dsl_prop_register(ds, "sync",
sync_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_dedup_checksum = ZIO_CHECKSUM_OFF;
os->os_dedup_verify = 0;
os->os_logbias = 0;
os->os_sync = 0;
os->os_primary_cache = ZFS_CACHE_ALL;
os->os_secondary_cache = ZFS_CACHE_ALL;
}
if (ds == NULL || !dsl_dataset_is_snapshot(ds))
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);
DMU_META_DNODE(os) = dnode_special_open(os,
&os->os_phys->os_meta_dnode, DMU_META_DNODE_OBJECT,
&os->os_meta_dnode);
if (arc_buf_size(os->os_phys_buf) >= sizeof (objset_phys_t)) {
DMU_USERUSED_DNODE(os) = dnode_special_open(os,
&os->os_phys->os_userused_dnode, DMU_USERUSED_OBJECT,
&os->os_userused_dnode);
DMU_GROUPUSED_DNODE(os) = dnode_special_open(os,
&os->os_phys->os_groupused_dnode, DMU_GROUPUSED_OBJECT,
&os->os_groupused_dnode);
}
/*
* 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, dsl_dataset_get_blkptr(ds), 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) {
dmu_objset_disown(*osp, tag);
return (EINVAL);
} else if (!readonly && dsl_dataset_is_snapshot(ds)) {
dmu_objset_disown(*osp, tag);
return (EROFS);
}
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, DMU_META_DNODE(os));
list_insert_tail(&os->os_dnodes, DMU_META_DNODE(os));
/*
* 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;
}
dn = list_head(&os->os_dnodes);
mutex_exit(&os->os_lock);
return (dn != DMU_META_DNODE(os));
}
void
dmu_objset_evict(objset_t *os)
{
dsl_dataset_t *ds = os->os_dsl_dataset;
int t;
for (t = 0; t < TXG_SIZE; t++)
ASSERT(!dmu_objset_is_dirty(os, t));
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, "dedup",
dedup_changed_cb, os));
VERIFY(0 == dsl_prop_unregister(ds, "logbias",
logbias_changed_cb, os));
VERIFY(0 == dsl_prop_unregister(ds, "sync",
sync_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));
}
if (os->os_sa)
sa_tear_down(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 (DMU_USERUSED_DNODE(os)) {
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);
/*
* This is a barrier to prevent the objset from going away in
* dnode_move() until we can safely ensure that the objset is still in
* use. We consider the objset valid before the barrier and invalid
* after the barrier.
*/
rw_enter(&os_lock, RW_READER);
rw_exit(&os_lock);
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 != NULL)
VERIFY(0 == dmu_objset_from_ds(ds, &os));
else
VERIFY(0 == dmu_objset_open_impl(spa, NULL, bp, &os));
mdn = DMU_META_DNODE(os);
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;
cred_t *cr;
};
/*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, dmu_tx_t *tx)
{
dsl_dir_t *dd = arg1;
spa_t *spa = dd->dd_pool->dp_spa;
struct oscarg *oa = arg2;
uint64_t obj;
ASSERT(dmu_tx_is_syncing(tx));
obj = dsl_dataset_create_sync(dd, oa->lastname,
oa->clone_origin, oa->flags, oa->cr, tx);
if (oa->clone_origin == NULL) {
dsl_pool_t *dp = dd->dd_pool;
dsl_dataset_t *ds;
blkptr_t *bp;
objset_t *os;
VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, obj, FTAG, &ds));
bp = dsl_dataset_get_blkptr(ds);
ASSERT(BP_IS_HOLE(bp));
os = dmu_objset_create_impl(spa, ds, bp, oa->type, tx);
if (oa->userfunc)
oa->userfunc(os, oa->userarg, oa->cr, tx);
dsl_dataset_rele(ds, FTAG);
}
spa_history_log_internal(LOG_DS_CREATE, spa, tx, "dataset = %llu", obj);
}
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;
oa.cr = CRED();
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;
oa.cr = CRED();
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;
error = dsl_dataset_own(name, B_TRUE, FTAG, &ds);
if (error == 0) {
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 *htag;
char failed[MAXPATHLEN];
boolean_t recursive;
boolean_t needsuspend;
boolean_t temporary;
nvlist_t *props;
struct dsl_ds_holdarg *ha; /* only needed in the temporary case */
dsl_dataset_t *newds;
};
static int
snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx)
{
objset_t *os = arg1;
struct snaparg *sn = arg2;
int error;
/* The props have already been checked by zfs_check_userprops(). */
error = dsl_dataset_snapshot_check(os->os_dsl_dataset,
sn->snapname, tx);
if (error)
return (error);
if (sn->temporary) {
/*
* Ideally we would just call
* dsl_dataset_user_hold_check() and
* dsl_dataset_destroy_check() here. However the
* dataset we want to hold and destroy is the snapshot
* that we just confirmed we can create, but it won't
* exist until after these checks are run. Do any
* checks we can here and if more checks are added to
* those routines in the future, similar checks may be
* necessary here.
*/
if (spa_version(os->os_spa) < SPA_VERSION_USERREFS)
return (ENOTSUP);
/*
* Not checking number of tags because the tag will be
* unique, as it will be the only tag.
*/
if (strlen(sn->htag) + MAX_TAG_PREFIX_LEN >= MAXNAMELEN)
return (E2BIG);
sn->ha = kmem_alloc(sizeof (struct dsl_ds_holdarg), KM_SLEEP);
sn->ha->temphold = B_TRUE;
sn->ha->htag = sn->htag;
}
return (error);
}
static void
snapshot_sync(void *arg1, void *arg2, 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, tx);
if (sn->props) {
dsl_props_arg_t pa;
pa.pa_props = sn->props;
pa.pa_source = ZPROP_SRC_LOCAL;
dsl_props_set_sync(ds->ds_prev, &pa, tx);
}
if (sn->temporary) {
struct dsl_ds_destroyarg da;
dsl_dataset_user_hold_sync(ds->ds_prev, sn->ha, tx);
kmem_free(sn->ha, sizeof (struct dsl_ds_holdarg));
sn->ha = NULL;
sn->newds = ds->ds_prev;
da.ds = ds->ds_prev;
da.defer = B_TRUE;
dsl_dataset_destroy_sync(&da, FTAG, tx);
}
}
static int
dmu_objset_snapshot_one(const char *name, void *arg)
{
struct snaparg *sn = arg;
objset_t *os;
int err;
char *cp;
/*
* If the objset starts with a '%', then ignore it unless it was
* explicitly named (ie, not recursive). These hidden datasets
* are always inconsistent, and by not opening them here, we can
* avoid a race with dsl_dir_destroy_check().
*/
cp = strrchr(name, '/');
if (cp && cp[1] == '%' && sn->recursive)
return (0);
(void) strcpy(sn->failed, name);
/*
* Check permissions if we are doing a recursive snapshot. The
* permission checks for the starting dataset have already been
* performed in zfs_secpolicy_snapshot()
*/
if (sn->recursive && (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 (eg, in the process
* of being destroyed), don't snapshot it. As with %hidden
* datasets, we return EBUSY if this name was explicitly
* requested (ie, not recursive), and otherwise ignore it.
*/
if (os->os_dsl_dataset->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) {
dmu_objset_rele(os, sn);
return (sn->recursive ? 0 : EBUSY);
}
if (sn->needsuspend) {
err = zil_suspend(dmu_objset_zil(os));
if (err) {
dmu_objset_rele(os, sn);
return (err);
}
}
dsl_sync_task_create(sn->dstg, snapshot_check, snapshot_sync,
os, sn, 3);
return (0);
}
int
dmu_objset_snapshot(char *fsname, char *snapname, char *tag,
nvlist_t *props, boolean_t recursive, boolean_t temporary, int cleanup_fd)
{
dsl_sync_task_t *dst;
struct snaparg *sn;
spa_t *spa;
minor_t minor;
int err;
sn = kmem_alloc(sizeof (struct snaparg), KM_SLEEP);
(void) strcpy(sn->failed, fsname);
err = spa_open(fsname, &spa, FTAG);
if (err) {
kmem_free(sn, sizeof (struct snaparg));
return (err);
}
if (temporary) {
if (cleanup_fd < 0) {
spa_close(spa, FTAG);
return (EINVAL);
}
if ((err = zfs_onexit_fd_hold(cleanup_fd, &minor)) != 0) {
spa_close(spa, FTAG);
return (err);
}
}
sn->dstg = dsl_sync_task_group_create(spa_get_dsl(spa));
sn->snapname = snapname;
sn->htag = tag;
sn->props = props;
sn->recursive = recursive;
sn->needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
sn->temporary = temporary;
sn->ha = NULL;
sn->newds = NULL;
if (recursive) {
err = dmu_objset_find(fsname,
dmu_objset_snapshot_one, sn, DS_FIND_CHILDREN);
} else {
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);
} else if (temporary) {
dsl_register_onexit_hold_cleanup(sn->newds, tag, minor);
}
if (sn->needsuspend)
zil_resume(dmu_objset_zil(os));
dmu_objset_rele(os, sn);
}
if (err)
(void) strcpy(fsname, sn->failed);
if (temporary)
zfs_onexit_fd_rele(cleanup_fd);
dsl_sync_task_group_destroy(sn->dstg);
spa_close(spa, FTAG);
kmem_free(sn, sizeof (struct snaparg));
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
dmu_objset_write_ready(zio_t *zio, arc_buf_t *abuf, void *arg)
{
int i;
blkptr_t *bp = zio->io_bp;
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 (i = 0; i < dnp->dn_nblkptr; i++)
bp->blk_fill += dnp->dn_blkptr[i].blk_fill;
}
/* ARGSUSED */
static void
dmu_objset_write_done(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;
if (zio->io_flags & ZIO_FLAG_IO_REWRITE) {
ASSERT(BP_EQUAL(bp, bp_orig));
} else {
dsl_dataset_t *ds = os->os_dsl_dataset;
dmu_tx_t *tx = os->os_synctx;
(void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE);
dsl_dataset_block_born(ds, bp, tx);
}
}
/* called from dsl */
void
dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx)
{
int txgoff;
zbookmark_t zb;
zio_prop_t zp;
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
*/
SET_BOOKMARK(&zb, os->os_dsl_dataset ?
os->os_dsl_dataset->ds_object : DMU_META_OBJSET,
ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
VERIFY3U(0, ==, arc_release_bp(os->os_phys_buf, &os->os_phys_buf,
os->os_rootbp, os->os_spa, &zb));
dmu_write_policy(os, NULL, 0, 0, &zp);
zio = arc_write(pio, os->os_spa, tx->tx_txg,
os->os_rootbp, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os), &zp,
dmu_objset_write_ready, dmu_objset_write_done, os,
ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb);
/*
* Sync special dnodes - the parent IO for the sync is the root block
*/
DMU_META_DNODE(os)->dn_zio = zio;
dnode_sync(DMU_META_DNODE(os), tx);
os->os_phys->os_flags = os->os_flags;
if (DMU_USERUSED_DNODE(os) &&
DMU_USERUSED_DNODE(os)->dn_type != DMU_OT_NONE) {
DMU_USERUSED_DNODE(os)->dn_zio = zio;
dnode_sync(DMU_USERUSED_DNODE(os), tx);
DMU_GROUPUSED_DNODE(os)->dn_zio = zio;
dnode_sync(DMU_GROUPUSED_DNODE(os), 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 = &DMU_META_DNODE(os)->dn_dirty_records[txgoff];
while ((dr = list_head(list)) != NULL) {
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);
}
boolean_t
dmu_objset_is_dirty(objset_t *os, uint64_t txg)
{
return (!list_is_empty(&os->os_dirty_dnodes[txg & TXG_MASK]) ||
!list_is_empty(&os->os_free_dnodes[txg & TXG_MASK]));
}
boolean_t
dmu_objset_is_dirty_anywhere(objset_t *os)
{
int t;
for (t = 0; t < TXG_SIZE; t++)
if (dmu_objset_is_dirty(os, t))
return (B_TRUE);
return (B_FALSE);
}
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] != NULL &&
DMU_USERUSED_DNODE(os) != NULL);
}
static void
do_userquota_update(objset_t *os, uint64_t used, uint64_t flags,
uint64_t user, uint64_t group, boolean_t subtract, dmu_tx_t *tx)
{
if ((flags & DNODE_FLAG_USERUSED_ACCOUNTED)) {
int64_t delta = DNODE_SIZE + used;
if (subtract)
delta = -delta;
VERIFY3U(0, ==, zap_increment_int(os, DMU_USERUSED_OBJECT,
user, delta, tx));
VERIFY3U(0, ==, zap_increment_int(os, DMU_GROUPUSED_OBJECT,
group, delta, tx));
}
}
void
dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx)
{
dnode_t *dn;
list_t *list = &os->os_synced_dnodes;
ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os));
while ((dn = list_head(list)) != NULL) {
int flags;
ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object));
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 (DMU_USERUSED_DNODE(os)->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));
}
/*
* We intentionally modify the zap object even if the
* net delta is zero. Otherwise
* the block of the zap obj could be shared between
* datasets but need to be different between them after
* a bprewrite.
*/
flags = dn->dn_id_flags;
ASSERT(flags);
if (flags & DN_ID_OLD_EXIST) {
do_userquota_update(os, dn->dn_oldused, dn->dn_oldflags,
dn->dn_olduid, dn->dn_oldgid, B_TRUE, tx);
}
if (flags & DN_ID_NEW_EXIST) {
do_userquota_update(os, DN_USED_BYTES(dn->dn_phys),
dn->dn_phys->dn_flags, dn->dn_newuid,
dn->dn_newgid, B_FALSE, tx);
}
mutex_enter(&dn->dn_mtx);
dn->dn_oldused = 0;
dn->dn_oldflags = 0;
if (dn->dn_id_flags & DN_ID_NEW_EXIST) {
dn->dn_olduid = dn->dn_newuid;
dn->dn_oldgid = dn->dn_newgid;
dn->dn_id_flags |= DN_ID_OLD_EXIST;
if (dn->dn_bonuslen == 0)
dn->dn_id_flags |= DN_ID_CHKED_SPILL;
else
dn->dn_id_flags |= DN_ID_CHKED_BONUS;
}
dn->dn_id_flags &= ~(DN_ID_NEW_EXIST);
mutex_exit(&dn->dn_mtx);
list_remove(list, dn);
dnode_rele(dn, list);
}
}
/*
* Returns a pointer to data to find uid/gid from
*
* If a dirty record for transaction group that is syncing can't
* be found then NULL is returned. In the NULL case it is assumed
* the uid/gid aren't changing.
*/
static void *
dmu_objset_userquota_find_data(dmu_buf_impl_t *db, dmu_tx_t *tx)
{
dbuf_dirty_record_t *dr, **drp;
void *data;
if (db->db_dirtycnt == 0)
return (db->db.db_data); /* Nothing is changing */
for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next)
if (dr->dr_txg == tx->tx_txg)
break;
if (dr == NULL) {
data = NULL;
} else {
dnode_t *dn;
DB_DNODE_ENTER(dr->dr_dbuf);
dn = DB_DNODE(dr->dr_dbuf);
if (dn->dn_bonuslen == 0 &&
dr->dr_dbuf->db_blkid == DMU_SPILL_BLKID)
data = dr->dt.dl.dr_data->b_data;
else
data = dr->dt.dl.dr_data;
DB_DNODE_EXIT(dr->dr_dbuf);
}
return (data);
}
void
dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx)
{
objset_t *os = dn->dn_objset;
void *data = NULL;
dmu_buf_impl_t *db = NULL;
uint64_t *user = NULL, *group = NULL;
int flags = dn->dn_id_flags;
int error;
boolean_t have_spill = B_FALSE;
if (!dmu_objset_userused_enabled(dn->dn_objset))
return;
if (before && (flags & (DN_ID_CHKED_BONUS|DN_ID_OLD_EXIST|
DN_ID_CHKED_SPILL)))
return;
if (before && dn->dn_bonuslen != 0)
data = DN_BONUS(dn->dn_phys);
else if (!before && dn->dn_bonuslen != 0) {
if (dn->dn_bonus) {
db = dn->dn_bonus;
mutex_enter(&db->db_mtx);
data = dmu_objset_userquota_find_data(db, tx);
} else {
data = DN_BONUS(dn->dn_phys);
}
} else if (dn->dn_bonuslen == 0 && dn->dn_bonustype == DMU_OT_SA) {
int rf = 0;
if (RW_WRITE_HELD(&dn->dn_struct_rwlock))
rf |= DB_RF_HAVESTRUCT;
error = dmu_spill_hold_by_dnode(dn,
rf | DB_RF_MUST_SUCCEED,
FTAG, (dmu_buf_t **)&db);
ASSERT(error == 0);
mutex_enter(&db->db_mtx);
data = (before) ? db->db.db_data :
dmu_objset_userquota_find_data(db, tx);
have_spill = B_TRUE;
} else {
mutex_enter(&dn->dn_mtx);
dn->dn_id_flags |= DN_ID_CHKED_BONUS;
mutex_exit(&dn->dn_mtx);
return;
}
if (before) {
ASSERT(data);
user = &dn->dn_olduid;
group = &dn->dn_oldgid;
} else if (data) {
user = &dn->dn_newuid;
group = &dn->dn_newgid;
}
/*
* Must always call the callback in case the object
* type has changed and that type isn't an object type to track
*/
error = used_cbs[os->os_phys->os_type](dn->dn_bonustype, data,
user, group);
/*
* Preserve existing uid/gid when the callback can't determine
* what the new uid/gid are and the callback returned EEXIST.
* The EEXIST error tells us to just use the existing uid/gid.
* If we don't know what the old values are then just assign
* them to 0, since that is a new file being created.
*/
if (!before && data == NULL && error == EEXIST) {
if (flags & DN_ID_OLD_EXIST) {
dn->dn_newuid = dn->dn_olduid;
dn->dn_newgid = dn->dn_oldgid;
} else {
dn->dn_newuid = 0;
dn->dn_newgid = 0;
}
error = 0;
}
if (db)
mutex_exit(&db->db_mtx);
mutex_enter(&dn->dn_mtx);
if (error == 0 && before)
dn->dn_id_flags |= DN_ID_OLD_EXIST;
if (error == 0 && !before)
dn->dn_id_flags |= DN_ID_NEW_EXIST;
if (have_spill) {
dn->dn_id_flags |= DN_ID_CHKED_SPILL;
} else {
dn->dn_id_flags |= DN_ID_CHKED_BONUS;
}
mutex_exit(&dn->dn_mtx);
if (have_spill)
dmu_buf_rele((dmu_buf_t *)db, FTAG);
}
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);
}
/*
* Determine the objset id for a given snapshot name.
*/
int
dmu_snapshot_id(objset_t *os, const char *snapname, uint64_t *idp)
{
dsl_dataset_t *ds = os->os_dsl_dataset;
zap_cursor_t cursor;
zap_attribute_t attr;
int error;
if (ds->ds_phys->ds_snapnames_zapobj == 0)
return (ENOENT);
zap_cursor_init(&cursor, ds->ds_dir->dd_pool->dp_meta_objset,
ds->ds_phys->ds_snapnames_zapobj);
error = zap_cursor_move_to_key(&cursor, snapname, MT_EXACT);
if (error) {
zap_cursor_fini(&cursor);
return (error);
}
error = zap_cursor_retrieve(&cursor, &attr);
if (error) {
zap_cursor_fini(&cursor);
return (error);
}
*idp = attr.za_first_integer;
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)(const 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(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(const 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_asprintf("%s/%s", name, attr->za_name);
err = dmu_objset_find_spa(spa, child, func, arg, flags);
strfree(child);
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_asprintf("%s@%s",
name, attr->za_name);
err = func(spa, attr->za_first_integer,
child, arg);
strfree(child);
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(const 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;
SET_BOOKMARK(&zb, ds->ds_object, ZB_ROOT_OBJECT,
ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
(void) dsl_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);
}
#if defined(_KERNEL) && defined(HAVE_SPL)
EXPORT_SYMBOL(dmu_objset_zil);
EXPORT_SYMBOL(dmu_objset_pool);
EXPORT_SYMBOL(dmu_objset_ds);
EXPORT_SYMBOL(dmu_objset_type);
EXPORT_SYMBOL(dmu_objset_name);
EXPORT_SYMBOL(dmu_objset_hold);
EXPORT_SYMBOL(dmu_objset_own);
EXPORT_SYMBOL(dmu_objset_rele);
EXPORT_SYMBOL(dmu_objset_disown);
EXPORT_SYMBOL(dmu_objset_from_ds);
EXPORT_SYMBOL(dmu_objset_create);
EXPORT_SYMBOL(dmu_objset_clone);
EXPORT_SYMBOL(dmu_objset_destroy);
EXPORT_SYMBOL(dmu_objset_snapshot);
EXPORT_SYMBOL(dmu_objset_stats);
EXPORT_SYMBOL(dmu_objset_fast_stat);
EXPORT_SYMBOL(dmu_objset_spa);
EXPORT_SYMBOL(dmu_objset_space);
EXPORT_SYMBOL(dmu_objset_fsid_guid);
EXPORT_SYMBOL(dmu_objset_find);
EXPORT_SYMBOL(dmu_objset_find_spa);
EXPORT_SYMBOL(dmu_objset_prefetch);
EXPORT_SYMBOL(dmu_objset_byteswap);
EXPORT_SYMBOL(dmu_objset_evict_dbufs);
EXPORT_SYMBOL(dmu_objset_snap_cmtime);
EXPORT_SYMBOL(dmu_objset_sync);
EXPORT_SYMBOL(dmu_objset_is_dirty);
EXPORT_SYMBOL(dmu_objset_create_impl);
EXPORT_SYMBOL(dmu_objset_open_impl);
EXPORT_SYMBOL(dmu_objset_evict);
EXPORT_SYMBOL(dmu_objset_register_type);
EXPORT_SYMBOL(dmu_objset_do_userquota_updates);
EXPORT_SYMBOL(dmu_objset_userquota_get_ids);
EXPORT_SYMBOL(dmu_objset_userused_enabled);
EXPORT_SYMBOL(dmu_objset_userspace_upgrade);
EXPORT_SYMBOL(dmu_objset_userspace_present);
#endif
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