Move the world out of /zfs/ and seperate out module build tree

module/zfs/dsl_prop.c

@@ -0,0 +1,602 @@
+/*
+ * 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"
+
+#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,
+    int intsz, int numint, void *buf, char *setpoint)
+{
+	int err = ENOENT;
+	objset_t *mos = dd->dd_pool->dp_meta_objset;
+	zfs_prop_t prop;
+
+	ASSERT(RW_LOCK_HELD(&dd->dd_pool->dp_config_rwlock));
+
+	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));
+}
+
+/*
+ * 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;
+	uint64_t value;
+	dsl_prop_cb_record_t *cbr;
+	int err;
+	int need_rwlock;
+
+	need_rwlock = !RW_WRITE_HELD(&dp->dp_config_rwlock);
+	if (need_rwlock)
+		rw_enter(&dp->dp_config_rwlock, RW_READER);
+
+	err = dsl_prop_get_ds(ds, propname, 8, 1, &value, NULL);
+	if (err != 0) {
+		if (need_rwlock)
+			rw_exit(&dp->dp_config_rwlock);
+		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,
+	    NULL, cbr, &dd));
+	if (need_rwlock)
+		rw_exit(&dp->dp_config_rwlock);
+	/* Leave dir open until this callback is unregistered */
+	return (0);
+}
+
+int
+dsl_prop_get(const char *dsname, const char *propname,
+    int intsz, int numints, void *buf, char *setpoint)
+{
+	dsl_dataset_t *ds;
+	int err;
+
+	err = dsl_dataset_hold(dsname, FTAG, &ds);
+	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);
+
+	dsl_dataset_rele(ds, FTAG);
+	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;
+
+	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);
+		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);
+	}
+	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;
+	struct prop_set_arg *psa = arg2;
+	objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
+	uint64_t zapobj, intval;
+	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;
+	}
+
+	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,
+			    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);
+		}
+	}
+	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);
+}
+
+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,
+    int intsz, int numints, const void *buf)
+{
+	dsl_dataset_t *ds;
+	int err;
+	struct prop_set_arg psa;
+
+	/*
+	 * 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);
+	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);
+	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)
+{
+	dsl_dataset_t *ds = os->os->os_dsl_dataset;
+	dsl_dir_t *dd = ds->ds_dir;
+	boolean_t snapshot = dsl_dataset_is_snapshot(ds);
+	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;
+
+	VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0);
+
+	if (local && snapshot && !propobj)
+		return (0);
+
+	rw_enter(&dp->dp_config_rwlock, RW_READER);
+	while (dd != NULL) {
+		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;
+		}
+
+		for (zap_cursor_init(&zc, mos, propobj);
+		    (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)))
+				continue;
+
+			/* Skip properties not valid for this type. */
+			if (snapshot && prop != ZPROP_INVAL &&
+			    !zfs_prop_valid_for_type(prop, ZFS_TYPE_SNAPSHOT))
+				continue;
+
+			/* Skip properties already defined */
+			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);
+				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;
+	}
+	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);
+}