mirror_zfs/zfs/lib/libzpool/dsl_prop.c

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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 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
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#include <sys/dmu.h>
#include <sys/dmu_objset.h>
#include <sys/dmu_tx.h>
#include <sys/dsl_dataset.h>
#include <sys/dsl_dir.h>
#include <sys/dsl_prop.h>
#include <sys/dsl_synctask.h>
#include <sys/spa.h>
#include <sys/zio_checksum.h> /* for the default checksum value */
#include <sys/zap.h>
#include <sys/fs/zfs.h>
#include "zfs_prop.h"
static int
dodefault(const char *propname, int intsz, int numint, void *buf)
{
zfs_prop_t prop;
/*
* The setonce properties are read-only, BUT they still
* have a default value that can be used as the initial
* value.
*/
if ((prop = zfs_name_to_prop(propname)) == ZPROP_INVAL ||
(zfs_prop_readonly(prop) && !zfs_prop_setonce(prop)))
return (ENOENT);
if (zfs_prop_get_type(prop) == PROP_TYPE_STRING) {
if (intsz != 1)
return (EOVERFLOW);
(void) strncpy(buf, zfs_prop_default_string(prop),
numint);
} else {
if (intsz != 8 || numint < 1)
return (EOVERFLOW);
*(uint64_t *)buf = zfs_prop_default_numeric(prop);
}
return (0);
}
int
dsl_prop_get_dd(dsl_dir_t *dd, const char *propname,
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int intsz, int numint, void *buf, char *setpoint)
{
int err = ENOENT;
objset_t *mos = dd->dd_pool->dp_meta_objset;
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zfs_prop_t prop;
ASSERT(RW_LOCK_HELD(&dd->dd_pool->dp_config_rwlock));
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if (setpoint)
setpoint[0] = '\0';
prop = zfs_name_to_prop(propname);
/*
* Note: dd may be NULL, therefore we shouldn't dereference it
* ouside this loop.
*/
for (; dd != NULL; dd = dd->dd_parent) {
ASSERT(RW_LOCK_HELD(&dd->dd_pool->dp_config_rwlock));
err = zap_lookup(mos, dd->dd_phys->dd_props_zapobj,
propname, intsz, numint, buf);
if (err != ENOENT) {
if (setpoint)
dsl_dir_name(dd, setpoint);
break;
}
/*
* Break out of this loop for non-inheritable properties.
*/
if (prop != ZPROP_INVAL && !zfs_prop_inheritable(prop))
break;
}
if (err == ENOENT)
err = dodefault(propname, intsz, numint, buf);
return (err);
}
int
dsl_prop_get_ds(dsl_dataset_t *ds, const char *propname,
int intsz, int numint, void *buf, char *setpoint)
{
ASSERT(RW_LOCK_HELD(&ds->ds_dir->dd_pool->dp_config_rwlock));
if (ds->ds_phys->ds_props_obj) {
int err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset,
ds->ds_phys->ds_props_obj, propname, intsz, numint, buf);
if (err != ENOENT) {
if (setpoint)
dsl_dataset_name(ds, setpoint);
return (err);
}
}
return (dsl_prop_get_dd(ds->ds_dir, propname,
intsz, numint, buf, setpoint));
}
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/*
* Register interest in the named property. We'll call the callback
* once to notify it of the current property value, and again each time
* the property changes, until this callback is unregistered.
*
* Return 0 on success, errno if the prop is not an integer value.
*/
int
dsl_prop_register(dsl_dataset_t *ds, const char *propname,
dsl_prop_changed_cb_t *callback, void *cbarg)
{
dsl_dir_t *dd = ds->ds_dir;
dsl_pool_t *dp = dd->dd_pool;
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uint64_t value;
dsl_prop_cb_record_t *cbr;
int err;
int need_rwlock;
need_rwlock = !RW_WRITE_HELD(&dp->dp_config_rwlock);
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if (need_rwlock)
rw_enter(&dp->dp_config_rwlock, RW_READER);
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err = dsl_prop_get_ds(ds, propname, 8, 1, &value, NULL);
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if (err != 0) {
if (need_rwlock)
rw_exit(&dp->dp_config_rwlock);
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return (err);
}
cbr = kmem_alloc(sizeof (dsl_prop_cb_record_t), KM_SLEEP);
cbr->cbr_ds = ds;
cbr->cbr_propname = kmem_alloc(strlen(propname)+1, KM_SLEEP);
(void) strcpy((char *)cbr->cbr_propname, propname);
cbr->cbr_func = callback;
cbr->cbr_arg = cbarg;
mutex_enter(&dd->dd_lock);
list_insert_head(&dd->dd_prop_cbs, cbr);
mutex_exit(&dd->dd_lock);
cbr->cbr_func(cbr->cbr_arg, value);
VERIFY(0 == dsl_dir_open_obj(dp, dd->dd_object,
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NULL, cbr, &dd));
if (need_rwlock)
rw_exit(&dp->dp_config_rwlock);
/* Leave dir open until this callback is unregistered */
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return (0);
}
int
dsl_prop_get(const char *dsname, const char *propname,
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int intsz, int numints, void *buf, char *setpoint)
{
dsl_dataset_t *ds;
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int err;
err = dsl_dataset_hold(dsname, FTAG, &ds);
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if (err)
return (err);
rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER);
err = dsl_prop_get_ds(ds, propname, intsz, numints, buf, setpoint);
rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock);
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dsl_dataset_rele(ds, FTAG);
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return (err);
}
/*
* Get the current property value. It may have changed by the time this
* function returns, so it is NOT safe to follow up with
* dsl_prop_register() and assume that the value has not changed in
* between.
*
* Return 0 on success, ENOENT if ddname is invalid.
*/
int
dsl_prop_get_integer(const char *ddname, const char *propname,
uint64_t *valuep, char *setpoint)
{
return (dsl_prop_get(ddname, propname, 8, 1, valuep, setpoint));
}
/*
* Unregister this callback. Return 0 on success, ENOENT if ddname is
* invalid, ENOMSG if no matching callback registered.
*/
int
dsl_prop_unregister(dsl_dataset_t *ds, const char *propname,
dsl_prop_changed_cb_t *callback, void *cbarg)
{
dsl_dir_t *dd = ds->ds_dir;
dsl_prop_cb_record_t *cbr;
mutex_enter(&dd->dd_lock);
for (cbr = list_head(&dd->dd_prop_cbs);
cbr; cbr = list_next(&dd->dd_prop_cbs, cbr)) {
if (cbr->cbr_ds == ds &&
cbr->cbr_func == callback &&
cbr->cbr_arg == cbarg &&
strcmp(cbr->cbr_propname, propname) == 0)
break;
}
if (cbr == NULL) {
mutex_exit(&dd->dd_lock);
return (ENOMSG);
}
list_remove(&dd->dd_prop_cbs, cbr);
mutex_exit(&dd->dd_lock);
kmem_free((void*)cbr->cbr_propname, strlen(cbr->cbr_propname)+1);
kmem_free(cbr, sizeof (dsl_prop_cb_record_t));
/* Clean up from dsl_prop_register */
dsl_dir_close(dd, cbr);
return (0);
}
/*
* Return the number of callbacks that are registered for this dataset.
*/
int
dsl_prop_numcb(dsl_dataset_t *ds)
{
dsl_dir_t *dd = ds->ds_dir;
dsl_prop_cb_record_t *cbr;
int num = 0;
mutex_enter(&dd->dd_lock);
for (cbr = list_head(&dd->dd_prop_cbs);
cbr; cbr = list_next(&dd->dd_prop_cbs, cbr)) {
if (cbr->cbr_ds == ds)
num++;
}
mutex_exit(&dd->dd_lock);
return (num);
}
static void
dsl_prop_changed_notify(dsl_pool_t *dp, uint64_t ddobj,
const char *propname, uint64_t value, int first)
{
dsl_dir_t *dd;
dsl_prop_cb_record_t *cbr;
objset_t *mos = dp->dp_meta_objset;
zap_cursor_t zc;
zap_attribute_t *za;
int err;
uint64_t dummyval;
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ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock));
err = dsl_dir_open_obj(dp, ddobj, NULL, FTAG, &dd);
if (err)
return;
if (!first) {
/*
* If the prop is set here, then this change is not
* being inherited here or below; stop the recursion.
*/
err = zap_lookup(mos, dd->dd_phys->dd_props_zapobj, propname,
8, 1, &dummyval);
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if (err == 0) {
dsl_dir_close(dd, FTAG);
return;
}
ASSERT3U(err, ==, ENOENT);
}
mutex_enter(&dd->dd_lock);
for (cbr = list_head(&dd->dd_prop_cbs); cbr;
cbr = list_next(&dd->dd_prop_cbs, cbr)) {
uint64_t propobj = cbr->cbr_ds->ds_phys->ds_props_obj;
if (strcmp(cbr->cbr_propname, propname) != 0)
continue;
/*
* If the property is set on this ds, then it is not
* inherited here; don't call the callback.
*/
if (propobj && 0 == zap_lookup(mos, propobj, propname,
8, 1, &dummyval))
continue;
cbr->cbr_func(cbr->cbr_arg, value);
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}
mutex_exit(&dd->dd_lock);
za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
for (zap_cursor_init(&zc, mos,
dd->dd_phys->dd_child_dir_zapobj);
zap_cursor_retrieve(&zc, za) == 0;
zap_cursor_advance(&zc)) {
dsl_prop_changed_notify(dp, za->za_first_integer,
propname, value, FALSE);
}
kmem_free(za, sizeof (zap_attribute_t));
zap_cursor_fini(&zc);
dsl_dir_close(dd, FTAG);
}
struct prop_set_arg {
const char *name;
int intsz;
int numints;
const void *buf;
};
static void
dsl_prop_set_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx)
{
dsl_dataset_t *ds = arg1;
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struct prop_set_arg *psa = arg2;
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
uint64_t zapobj, intval;
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int isint;
char valbuf[32];
char *valstr;
isint = (dodefault(psa->name, 8, 1, &intval) == 0);
if (dsl_dataset_is_snapshot(ds)) {
ASSERT(spa_version(ds->ds_dir->dd_pool->dp_spa) >=
SPA_VERSION_SNAP_PROPS);
if (ds->ds_phys->ds_props_obj == 0) {
dmu_buf_will_dirty(ds->ds_dbuf, tx);
ds->ds_phys->ds_props_obj =
zap_create(mos,
DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx);
}
zapobj = ds->ds_phys->ds_props_obj;
} else {
zapobj = ds->ds_dir->dd_phys->dd_props_zapobj;
}
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if (psa->numints == 0) {
int err = zap_remove(mos, zapobj, psa->name, tx);
ASSERT(err == 0 || err == ENOENT);
if (isint) {
VERIFY(0 == dsl_prop_get_ds(ds,
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psa->name, 8, 1, &intval, NULL));
}
} else {
VERIFY(0 == zap_update(mos, zapobj, psa->name,
psa->intsz, psa->numints, psa->buf, tx));
if (isint)
intval = *(uint64_t *)psa->buf;
}
if (isint) {
if (dsl_dataset_is_snapshot(ds)) {
dsl_prop_cb_record_t *cbr;
/*
* It's a snapshot; nothing can inherit this
* property, so just look for callbacks on this
* ds here.
*/
mutex_enter(&ds->ds_dir->dd_lock);
for (cbr = list_head(&ds->ds_dir->dd_prop_cbs); cbr;
cbr = list_next(&ds->ds_dir->dd_prop_cbs, cbr)) {
if (cbr->cbr_ds == ds &&
strcmp(cbr->cbr_propname, psa->name) == 0)
cbr->cbr_func(cbr->cbr_arg, intval);
}
mutex_exit(&ds->ds_dir->dd_lock);
} else {
dsl_prop_changed_notify(ds->ds_dir->dd_pool,
ds->ds_dir->dd_object, psa->name, intval, TRUE);
}
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}
if (isint) {
(void) snprintf(valbuf, sizeof (valbuf),
"%lld", (longlong_t)intval);
valstr = valbuf;
} else {
valstr = (char *)psa->buf;
}
spa_history_internal_log((psa->numints == 0) ? LOG_DS_INHERIT :
LOG_DS_PROPSET, ds->ds_dir->dd_pool->dp_spa, tx, cr,
"%s=%s dataset = %llu", psa->name, valstr, ds->ds_object);
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}
void
dsl_prop_set_uint64_sync(dsl_dir_t *dd, const char *name, uint64_t val,
cred_t *cr, dmu_tx_t *tx)
{
objset_t *mos = dd->dd_pool->dp_meta_objset;
uint64_t zapobj = dd->dd_phys->dd_props_zapobj;
ASSERT(dmu_tx_is_syncing(tx));
VERIFY(0 == zap_update(mos, zapobj, name, sizeof (val), 1, &val, tx));
dsl_prop_changed_notify(dd->dd_pool, dd->dd_object, name, val, TRUE);
spa_history_internal_log(LOG_DS_PROPSET, dd->dd_pool->dp_spa, tx, cr,
"%s=%llu dataset = %llu", name, (u_longlong_t)val,
dd->dd_phys->dd_head_dataset_obj);
}
int
dsl_prop_set(const char *dsname, const char *propname,
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int intsz, int numints, const void *buf)
{
dsl_dataset_t *ds;
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int err;
struct prop_set_arg psa;
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/*
* We must do these checks before we get to the syncfunc, since
* it can't fail.
*/
if (strlen(propname) >= ZAP_MAXNAMELEN)
return (ENAMETOOLONG);
if (intsz * numints >= ZAP_MAXVALUELEN)
return (E2BIG);
err = dsl_dataset_hold(dsname, FTAG, &ds);
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if (err)
return (err);
if (dsl_dataset_is_snapshot(ds) &&
spa_version(ds->ds_dir->dd_pool->dp_spa) < SPA_VERSION_SNAP_PROPS) {
dsl_dataset_rele(ds, FTAG);
return (ENOTSUP);
}
psa.name = propname;
psa.intsz = intsz;
psa.numints = numints;
psa.buf = buf;
err = dsl_sync_task_do(ds->ds_dir->dd_pool,
NULL, dsl_prop_set_sync, ds, &psa, 2);
dsl_dataset_rele(ds, FTAG);
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return (err);
}
/*
* Iterate over all properties for this dataset and return them in an nvlist.
*/
int
dsl_prop_get_all(objset_t *os, nvlist_t **nvp, boolean_t local)
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{
dsl_dataset_t *ds = os->os->os_dsl_dataset;
dsl_dir_t *dd = ds->ds_dir;
boolean_t snapshot = dsl_dataset_is_snapshot(ds);
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int err = 0;
dsl_pool_t *dp = dd->dd_pool;
objset_t *mos = dp->dp_meta_objset;
uint64_t propobj = ds->ds_phys->ds_props_obj;
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VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0);
if (local && snapshot && !propobj)
return (0);
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rw_enter(&dp->dp_config_rwlock, RW_READER);
while (dd != NULL) {
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char setpoint[MAXNAMELEN];
zap_cursor_t zc;
zap_attribute_t za;
dsl_dir_t *dd_next;
if (propobj) {
dsl_dataset_name(ds, setpoint);
dd_next = dd;
} else {
dsl_dir_name(dd, setpoint);
propobj = dd->dd_phys->dd_props_zapobj;
dd_next = dd->dd_parent;
}
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for (zap_cursor_init(&zc, mos, propobj);
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(err = zap_cursor_retrieve(&zc, &za)) == 0;
zap_cursor_advance(&zc)) {
nvlist_t *propval;
zfs_prop_t prop = zfs_name_to_prop(za.za_name);
/* Skip non-inheritable properties. */
if (prop != ZPROP_INVAL &&
!zfs_prop_inheritable(prop) &&
(dd != ds->ds_dir || (snapshot && dd != dd_next)))
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continue;
/* Skip properties not valid for this type. */
if (snapshot && prop != ZPROP_INVAL &&
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!zfs_prop_valid_for_type(prop, ZFS_TYPE_SNAPSHOT))
continue;
/* Skip properties already defined */
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if (nvlist_lookup_nvlist(*nvp, za.za_name,
&propval) == 0)
continue;
VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME,
KM_SLEEP) == 0);
if (za.za_integer_length == 1) {
/*
* String property
*/
char *tmp = kmem_alloc(za.za_num_integers,
KM_SLEEP);
err = zap_lookup(mos, propobj,
za.za_name, 1, za.za_num_integers, tmp);
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if (err != 0) {
kmem_free(tmp, za.za_num_integers);
break;
}
VERIFY(nvlist_add_string(propval, ZPROP_VALUE,
tmp) == 0);
kmem_free(tmp, za.za_num_integers);
} else {
/*
* Integer property
*/
ASSERT(za.za_integer_length == 8);
(void) nvlist_add_uint64(propval, ZPROP_VALUE,
za.za_first_integer);
}
VERIFY(nvlist_add_string(propval, ZPROP_SOURCE,
setpoint) == 0);
VERIFY(nvlist_add_nvlist(*nvp, za.za_name,
propval) == 0);
nvlist_free(propval);
}
zap_cursor_fini(&zc);
if (err != ENOENT)
break;
err = 0;
/*
* If we are just after the props that have been set
* locally, then we are done after the first iteration.
*/
if (local)
break;
dd = dd_next;
propobj = 0;
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}
rw_exit(&dp->dp_config_rwlock);
return (err);
}
void
dsl_prop_nvlist_add_uint64(nvlist_t *nv, zfs_prop_t prop, uint64_t value)
{
nvlist_t *propval;
VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, value) == 0);
VERIFY(nvlist_add_nvlist(nv, zfs_prop_to_name(prop), propval) == 0);
nvlist_free(propval);
}
void
dsl_prop_nvlist_add_string(nvlist_t *nv, zfs_prop_t prop, const char *value)
{
nvlist_t *propval;
VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
VERIFY(nvlist_add_string(propval, ZPROP_VALUE, value) == 0);
VERIFY(nvlist_add_nvlist(nv, zfs_prop_to_name(prop), propval) == 0);
nvlist_free(propval);
}