dsl_dir.c revision 1649cd4b1641110b549d9f70a902cafc2007bd77
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (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 2005 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_tx.h>
#include <sys/dsl_dataset.h>
#include <sys/dsl_dir.h>
#include <sys/dsl_prop.h>
#include <sys/spa.h>
#include <sys/zap.h>
#include <sys/zio.h>
#include <sys/arc.h>
#include "zfs_namecheck.h"
static uint64_t dsl_dir_space_accounted(dsl_dir_t *dd);
static uint64_t dsl_dir_estimated_space(dsl_dir_t *dd);
static int dsl_dir_set_reservation_sync(dsl_dir_t *dd,
void *arg, dmu_tx_t *tx);
static uint64_t dsl_dir_space_available(dsl_dir_t *dd,
dsl_dir_t *ancestor, int64_t delta, int ondiskonly);
/* ARGSUSED */
static void
dsl_dir_evict(dmu_buf_t *db, void *arg)
{
dsl_dir_t *dd = arg;
dsl_pool_t *dp = dd->dd_pool;
int t;
for (t = 0; t < TXG_SIZE; t++) {
ASSERT(!txg_list_member(&dp->dp_dirty_dirs, dd, t));
ASSERT(dd->dd_tempreserved[t] == 0);
ASSERT(dd->dd_space_towrite[t] == 0);
}
ASSERT3U(dd->dd_used_bytes, ==, dd->dd_phys->dd_used_bytes);
ASSERT(dd->dd_sync_txg == 0);
if (dd->dd_parent)
dsl_dir_close(dd->dd_parent, dd);
spa_close(dd->dd_pool->dp_spa, dd);
/*
* The props callback list should be empty since they hold the
* dir open.
*/
list_destroy(&dd->dd_prop_cbs);
kmem_free(dd, sizeof (dsl_dir_t));
}
dsl_dir_t *
dsl_dir_open_obj(dsl_pool_t *dp, uint64_t ddobj,
const char *tail, void *tag)
{
dmu_buf_t *dbuf;
dsl_dir_t *dd;
ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) ||
dsl_pool_sync_context(dp));
dbuf = dmu_bonus_hold_tag(dp->dp_meta_objset, ddobj, tag);
dmu_buf_read(dbuf);
dd = dmu_buf_get_user(dbuf);
#ifdef ZFS_DEBUG
{
dmu_object_info_t doi;
dmu_object_info_from_db(dbuf, &doi);
ASSERT3U(doi.doi_type, ==, DMU_OT_DSL_DIR);
}
#endif
/* XXX assert bonus buffer size is correct */
if (dd == NULL) {
dsl_dir_t *winner;
int err;
dd = kmem_zalloc(sizeof (dsl_dir_t), KM_SLEEP);
dd->dd_object = ddobj;
dd->dd_dbuf = dbuf;
dd->dd_pool = dp;
dd->dd_phys = dbuf->db_data;
dd->dd_used_bytes = dd->dd_phys->dd_used_bytes;
list_create(&dd->dd_prop_cbs, sizeof (dsl_prop_cb_record_t),
offsetof(dsl_prop_cb_record_t, cbr_node));
if (dd->dd_phys->dd_parent_obj) {
dd->dd_parent = dsl_dir_open_obj(dp,
dd->dd_phys->dd_parent_obj, NULL, dd);
if (tail) {
#ifdef ZFS_DEBUG
uint64_t foundobj;
err = zap_lookup(dp->dp_meta_objset,
dd->dd_parent->dd_phys->
dd_child_dir_zapobj,
tail, sizeof (foundobj), 1, &foundobj);
ASSERT3U(err, ==, 0);
ASSERT3U(foundobj, ==, ddobj);
#endif
(void) strcpy(dd->dd_myname, tail);
} else {
err = zap_value_search(dp->dp_meta_objset,
dd->dd_parent->dd_phys->
dd_child_dir_zapobj,
ddobj, dd->dd_myname);
/*
* The caller should be protecting this ddobj
* from being deleted concurrently
*/
ASSERT(err == 0);
}
} else {
(void) strcpy(dd->dd_myname, spa_name(dp->dp_spa));
}
winner = dmu_buf_set_user_ie(dbuf, dd, &dd->dd_phys,
dsl_dir_evict);
if (winner) {
if (dd->dd_parent)
dsl_dir_close(dd->dd_parent, dd);
kmem_free(dd, sizeof (dsl_dir_t));
dd = winner;
} else {
spa_open_ref(dp->dp_spa, dd);
}
}
/*
* The dsl_dir_t has both open-to-close and instantiate-to-evict
* holds on the spa. We need the open-to-close holds because
* otherwise the spa_refcnt wouldn't change when we open a
* dir which the spa also has open, so we could incorrectly
* think it was OK to unload/export/destroy the pool. We need
* the instantiate-to-evict hold because the dsl_dir_t has a
* pointer to the dd_pool, which has a pointer to the spa_t.
*/
spa_open_ref(dp->dp_spa, tag);
ASSERT3P(dd->dd_pool, ==, dp);
ASSERT3U(dd->dd_object, ==, ddobj);
ASSERT3P(dd->dd_dbuf, ==, dbuf);
return (dd);
}
void
dsl_dir_close(dsl_dir_t *dd, void *tag)
{
dprintf_dd(dd, "%s\n", "");
spa_close(dd->dd_pool->dp_spa, tag);
dmu_buf_rele_tag(dd->dd_dbuf, tag);
}
/* buf must be long enough (MAXNAMELEN should do) */
void
dsl_dir_name(dsl_dir_t *dd, char *buf)
{
if (dd->dd_parent) {
dsl_dir_name(dd->dd_parent, buf);
(void) strcat(buf, "/");
} else {
buf[0] = '\0';
}
if (!MUTEX_HELD(&dd->dd_lock)) {
/*
* recursive mutex so that we can use
* dprintf_dd() with dd_lock held
*/
mutex_enter(&dd->dd_lock);
(void) strcat(buf, dd->dd_myname);
mutex_exit(&dd->dd_lock);
} else {
(void) strcat(buf, dd->dd_myname);
}
}
int
dsl_dir_is_private(dsl_dir_t *dd)
{
int rv = FALSE;
if (dd->dd_parent && dsl_dir_is_private(dd->dd_parent))
rv = TRUE;
if (dataset_name_hidden(dd->dd_myname))
rv = TRUE;
return (rv);
}
static int
getcomponent(const char *path, char *component, const char **nextp)
{
char *p;
if (path == NULL)
return (NULL);
/* This would be a good place to reserve some namespace... */
p = strpbrk(path, "/@");
if (p && (p[1] == '/' || p[1] == '@')) {
/* two separators in a row */
return (EINVAL);
}
if (p == NULL || p == path) {
/*
* if the first thing is an @ or /, it had better be an
* @ and it had better not have any more ats or slashes,
* and it had better have something after the @.
*/
if (p != NULL &&
(p[0] != '@' || strpbrk(path+1, "/@") || p[1] == '\0'))
return (EINVAL);
if (strlen(path) >= MAXNAMELEN)
return (ENAMETOOLONG);
(void) strcpy(component, path);
p = NULL;
} else if (p[0] == '/') {
if (p-path >= MAXNAMELEN)
return (ENAMETOOLONG);
(void) strncpy(component, path, p - path);
component[p-path] = '\0';
p++;
} else if (p[0] == '@') {
/*
* if the next separator is an @, there better not be
* any more slashes.
*/
if (strchr(path, '/'))
return (EINVAL);
if (p-path >= MAXNAMELEN)
return (ENAMETOOLONG);
(void) strncpy(component, path, p - path);
component[p-path] = '\0';
} else {
ASSERT(!"invalid p");
}
*nextp = p;
return (0);
}
/*
* same as dsl_open_dir, ignore the first component of name and use the
* spa instead
*/
dsl_dir_t *
dsl_dir_open_spa(spa_t *spa, const char *name, void *tag, const char **tailp)
{
char buf[MAXNAMELEN];
const char *next, *nextnext = NULL;
int err;
dsl_dir_t *dd;
dsl_pool_t *dp;
uint64_t ddobj;
int openedspa = FALSE;
dprintf("%s\n", name);
if (name == NULL)
return (NULL);
err = getcomponent(name, buf, &next);
if (err)
return (NULL);
if (spa == NULL) {
err = spa_open(buf, &spa, FTAG);
if (err) {
dprintf("spa_open(%s) failed\n", buf);
return (NULL);
}
openedspa = TRUE;
/* XXX this assertion belongs in spa_open */
ASSERT(!dsl_pool_sync_context(spa_get_dsl(spa)));
}
dp = spa_get_dsl(spa);
rw_enter(&dp->dp_config_rwlock, RW_READER);
dd = dsl_dir_open_obj(dp, dp->dp_root_dir_obj, NULL, tag);
while (next != NULL) {
dsl_dir_t *child_ds;
err = getcomponent(next, buf, &nextnext);
if (err) {
dsl_dir_close(dd, tag);
rw_exit(&dp->dp_config_rwlock);
if (openedspa)
spa_close(spa, FTAG);
return (NULL);
}
ASSERT(next[0] != '\0');
if (next[0] == '@')
break;
if (dd->dd_phys->dd_child_dir_zapobj == 0)
break;
dprintf("looking up %s in obj%lld\n",
buf, dd->dd_phys->dd_child_dir_zapobj);
err = zap_lookup(dp->dp_meta_objset,
dd->dd_phys->dd_child_dir_zapobj,
buf, sizeof (ddobj), 1, &ddobj);
if (err == ENOENT) {
break;
}
ASSERT(err == 0);
child_ds = dsl_dir_open_obj(dp, ddobj, buf, tag);
dsl_dir_close(dd, tag);
dd = child_ds;
next = nextnext;
}
rw_exit(&dp->dp_config_rwlock);
/*
* It's an error if there's more than one component left, or
* tailp==NULL and there's any component left.
*/
if (next != NULL &&
(tailp == NULL || (nextnext && nextnext[0] != '\0'))) {
/* bad path name */
dsl_dir_close(dd, tag);
dprintf("next=%p (%s) tail=%p\n", next, next?next:"", tailp);
next = NULL;
dd = NULL;
}
if (tailp)
*tailp = next;
if (openedspa)
spa_close(spa, FTAG);
return (dd);
}
/*
* Return the dsl_dir_t, and possibly the last component which couldn't
* be found in *tail. Return NULL if the path is bogus, or if
* tail==NULL and we couldn't parse the whole name. (*tail)[0] == '@'
* means that the last component is a snapshot.
*/
dsl_dir_t *
dsl_dir_open(const char *name, void *tag, const char **tailp)
{
return (dsl_dir_open_spa(NULL, name, tag, tailp));
}
int
dsl_dir_create_sync(dsl_dir_t *pds, const char *name, dmu_tx_t *tx)
{
objset_t *mos = pds->dd_pool->dp_meta_objset;
uint64_t ddobj;
dsl_dir_phys_t *dsphys;
dmu_buf_t *dbuf;
int err;
ASSERT(dmu_tx_is_syncing(tx));
if (pds->dd_phys->dd_child_dir_zapobj == 0) {
dmu_buf_will_dirty(pds->dd_dbuf, tx);
pds->dd_phys->dd_child_dir_zapobj = zap_create(mos,
DMU_OT_DSL_DIR_CHILD_MAP, DMU_OT_NONE, 0, tx);
}
rw_enter(&pds->dd_pool->dp_config_rwlock, RW_WRITER);
err = zap_lookup(mos, pds->dd_phys->dd_child_dir_zapobj,
name, sizeof (uint64_t), 1, &ddobj);
if (err != ENOENT) {
rw_exit(&pds->dd_pool->dp_config_rwlock);
return (err ? err : EEXIST);
}
ddobj = dmu_object_alloc(mos, DMU_OT_DSL_DIR, 0,
DMU_OT_DSL_DIR, sizeof (dsl_dir_phys_t), tx);
err = zap_add(mos, pds->dd_phys->dd_child_dir_zapobj,
name, sizeof (uint64_t), 1, &ddobj, tx);
ASSERT3U(err, ==, 0);
dprintf("dataset_create: zap_add %s->%lld to %lld returned %d\n",
name, ddobj, pds->dd_phys->dd_child_dir_zapobj, err);
dbuf = dmu_bonus_hold(mos, ddobj);
dmu_buf_will_dirty(dbuf, tx);
dsphys = dbuf->db_data;
dsphys->dd_creation_time = gethrestime_sec();
dsphys->dd_parent_obj = pds->dd_object;
dsphys->dd_props_zapobj = zap_create(mos,
DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx);
dsphys->dd_child_dir_zapobj = zap_create(mos,
DMU_OT_DSL_DIR_CHILD_MAP, DMU_OT_NONE, 0, tx);
dmu_buf_rele(dbuf);
rw_exit(&pds->dd_pool->dp_config_rwlock);
return (0);
}
int
dsl_dir_destroy_sync(dsl_dir_t *pds, void *arg, dmu_tx_t *tx)
{
const char *name = arg;
dsl_dir_t *dd = NULL;
dsl_pool_t *dp = pds->dd_pool;
objset_t *mos = dp->dp_meta_objset;
uint64_t val, obj, child_zapobj, props_zapobj;
int t, err;
rw_enter(&dp->dp_config_rwlock, RW_WRITER);
err = zap_lookup(mos, pds->dd_phys->dd_child_dir_zapobj, name,
8, 1, &obj);
if (err)
goto out;
dd = dsl_dir_open_obj(dp, obj, name, FTAG);
ASSERT3U(dd->dd_phys->dd_parent_obj, ==, pds->dd_object);
if (dmu_buf_refcount(dd->dd_dbuf) > 1) {
err = EBUSY;
goto out;
}
for (t = 0; t < TXG_SIZE; t++) {
/*
* if they were dirty, they'd also be open.
* dp_config_rwlock ensures that it stays that way.
*/
ASSERT(!txg_list_member(&dp->dp_dirty_dirs, dd, t));
}
child_zapobj = dd->dd_phys->dd_child_dir_zapobj;
props_zapobj = dd->dd_phys->dd_props_zapobj;
if (child_zapobj != 0) {
uint64_t count;
err = EEXIST;
(void) zap_count(mos, child_zapobj, &count);
if (count != 0)
goto out;
}
if (dd->dd_phys->dd_head_dataset_obj != 0) {
err = dsl_dataset_destroy_sync(dd, NULL, tx);
if (err)
goto out;
}
ASSERT(dd->dd_phys->dd_head_dataset_obj == 0);
/* The point of no (unsuccessful) return */
/* Make sure parent's used gets updated */
val = 0;
err = dsl_dir_set_reservation_sync(dd, &val, tx);
ASSERT(err == 0);
ASSERT3U(dd->dd_used_bytes, ==, 0);
ASSERT3U(dd->dd_phys->dd_reserved, ==, 0);
dsl_dir_close(dd, FTAG);
dd = NULL;
err = dmu_object_free(mos, obj, tx);
ASSERT(err == 0);
if (child_zapobj)
err = zap_destroy(mos, child_zapobj, tx);
ASSERT(err == 0);
if (props_zapobj)
err = zap_destroy(mos, props_zapobj, tx);
ASSERT(err == 0);
err = zap_remove(mos, pds->dd_phys->dd_child_dir_zapobj, name, tx);
ASSERT(err == 0);
out:
rw_exit(&dp->dp_config_rwlock);
if (dd)
dsl_dir_close(dd, FTAG);
return (err);
}
void
dsl_dir_create_root(objset_t *mos, uint64_t *ddobjp, dmu_tx_t *tx)
{
dsl_dir_phys_t *dsp;
dmu_buf_t *dbuf;
int error;
*ddobjp = dmu_object_alloc(mos, DMU_OT_DSL_DIR, 0,
DMU_OT_DSL_DIR, sizeof (dsl_dir_phys_t), tx);
error = zap_add(mos, DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_ROOT_DATASET,
sizeof (uint64_t), 1, ddobjp, tx);
ASSERT3U(error, ==, 0);
dbuf = dmu_bonus_hold(mos, *ddobjp);
dmu_buf_will_dirty(dbuf, tx);
dsp = dbuf->db_data;
dsp->dd_creation_time = gethrestime_sec();
dsp->dd_props_zapobj = zap_create(mos,
DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx);
dsp->dd_child_dir_zapobj = zap_create(mos,
DMU_OT_DSL_DIR_CHILD_MAP, DMU_OT_NONE, 0, tx);
dmu_buf_rele(dbuf);
}
void
dsl_dir_stats(dsl_dir_t *dd, dmu_objset_stats_t *dds)
{
bzero(dds, sizeof (dmu_objset_stats_t));
dds->dds_dir_obj = dd->dd_object;
dds->dds_available = dsl_dir_space_available(dd, NULL, 0, TRUE);
mutex_enter(&dd->dd_lock);
dds->dds_space_used = dd->dd_used_bytes;
dds->dds_compressed_bytes = dd->dd_phys->dd_compressed_bytes;
dds->dds_uncompressed_bytes = dd->dd_phys->dd_uncompressed_bytes;
dds->dds_quota = dd->dd_phys->dd_quota;
dds->dds_reserved = dd->dd_phys->dd_reserved;
mutex_exit(&dd->dd_lock);
dds->dds_creation_time = dd->dd_phys->dd_creation_time;
dds->dds_is_placeholder = (dd->dd_phys->dd_head_dataset_obj == 0);
if (dd->dd_phys->dd_clone_parent_obj) {
dsl_dataset_t *ds;
rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER);
ds = dsl_dataset_open_obj(dd->dd_pool,
dd->dd_phys->dd_clone_parent_obj, NULL, DS_MODE_NONE, FTAG);
dsl_dataset_name(ds, dds->dds_clone_of);
dds->dds_clone_of_obj = dd->dd_phys->dd_clone_parent_obj;
dsl_dataset_close(ds, DS_MODE_NONE, FTAG);
rw_exit(&dd->dd_pool->dp_config_rwlock);
}
VERIFY(dsl_prop_get_ds_integer(dd, "checksum",
&dds->dds_checksum, dds->dds_checksum_setpoint) == 0);
VERIFY(dsl_prop_get_ds_integer(dd, "compression",
&dds->dds_compression, dds->dds_compression_setpoint) == 0);
VERIFY(dsl_prop_get_ds_integer(dd, "zoned",
&dds->dds_zoned, dds->dds_zoned_setpoint) == 0);
spa_altroot(dd->dd_pool->dp_spa, dds->dds_altroot,
sizeof (dds->dds_altroot));
}
int
dsl_dir_sync_task(dsl_dir_t *dd,
int (*func)(dsl_dir_t *, void*, dmu_tx_t *), void *arg, uint64_t space)
{
dmu_tx_t *tx;
dsl_pool_t *dp = dd->dd_pool;
int err = 0;
uint64_t txg;
dprintf_dd(dd, "func=%p space=%llu\n", func, space);
again:
tx = dmu_tx_create_ds(dd);
dmu_tx_hold_space(tx, space);
err = dmu_tx_assign(tx, TXG_WAIT);
if (err == ENOSPC || err == EDQUOT) {
dsl_dir_t *rds;
/*
* They can get their space from either this dd, or the
* root dd.
*/
for (rds = dd; rds->dd_parent; rds = rds->dd_parent)
continue;
dmu_tx_abort(tx);
tx = dmu_tx_create_ds(rds);
dmu_tx_hold_space(tx, space);
err = dmu_tx_assign(tx, TXG_WAIT);
}
if (err) {
dmu_tx_abort(tx);
return (err);
}
txg = dmu_tx_get_txg(tx);
mutex_enter(&dd->dd_lock);
if (dd->dd_sync_txg != 0) {
mutex_exit(&dd->dd_lock);
dmu_tx_commit(tx);
txg_wait_synced(dp, 0);
goto again;
}
/* We're good to go */
dd->dd_sync_txg = txg;
dd->dd_sync_func = func;
dd->dd_sync_arg = arg;
mutex_exit(&dd->dd_lock);
dsl_dir_dirty(dd, tx);
dmu_tx_commit(tx);
txg_wait_synced(dp, txg);
mutex_enter(&dd->dd_lock);
ASSERT(dd->dd_sync_txg == txg);
ASSERT(dd->dd_sync_func == NULL);
err = dd->dd_sync_err;
dd->dd_sync_txg = 0;
mutex_exit(&dd->dd_lock);
return (err);
}
void
dsl_dir_dirty(dsl_dir_t *dd, dmu_tx_t *tx)
{
dsl_pool_t *dp = dd->dd_pool;
ASSERT(dd->dd_phys);
if (txg_list_add(&dp->dp_dirty_dirs, dd, tx->tx_txg) == 0) {
/* up the hold count until we can be written out */
dmu_buf_add_ref(dd->dd_dbuf, dd);
}
}
static int64_t
parent_delta(dsl_dir_t *dd, uint64_t used, int64_t delta)
{
uint64_t old_accounted = MAX(used, dd->dd_phys->dd_reserved);
uint64_t new_accounted = MAX(used + delta, dd->dd_phys->dd_reserved);
return (new_accounted - old_accounted);
}
void
dsl_dir_sync(dsl_dir_t *dd, dmu_tx_t *tx)
{
if (dd->dd_sync_txg == tx->tx_txg && dd->dd_sync_func) {
dd->dd_sync_err = dd->dd_sync_func(dd, dd->dd_sync_arg, tx);
dd->dd_sync_func = NULL;
}
ASSERT(dmu_tx_is_syncing(tx));
dmu_buf_will_dirty(dd->dd_dbuf, tx);
mutex_enter(&dd->dd_lock);
ASSERT3U(dd->dd_tempreserved[tx->tx_txg&TXG_MASK], ==, 0);
dprintf_dd(dd, "txg=%llu towrite=%lluK\n", tx->tx_txg,
dd->dd_space_towrite[tx->tx_txg&TXG_MASK] / 1024);
dd->dd_space_towrite[tx->tx_txg&TXG_MASK] = 0;
dd->dd_phys->dd_used_bytes = dd->dd_used_bytes;
mutex_exit(&dd->dd_lock);
/* release the hold from dsl_dir_dirty */
dmu_buf_remove_ref(dd->dd_dbuf, dd);
}
static uint64_t
dsl_dir_estimated_space(dsl_dir_t *dd)
{
int64_t space;
int i;
ASSERT(MUTEX_HELD(&dd->dd_lock));
space = dd->dd_used_bytes;
ASSERT(space >= 0);
for (i = 0; i < TXG_SIZE; i++) {
space += dd->dd_space_towrite[i&TXG_MASK];
ASSERT3U(dd->dd_space_towrite[i&TXG_MASK], >=, 0);
}
return (space);
}
/*
* How much space would dd have available if ancestor had delta applied
* to it? If ondiskonly is set, we're only interested in what's
* on-disk, not estimated pending changes.
*/
static uint64_t
dsl_dir_space_available(dsl_dir_t *dd,
dsl_dir_t *ancestor, int64_t delta, int ondiskonly)
{
uint64_t parentspace, myspace, quota, used;
/*
* If there are no restrictions otherwise, assume we have
* unlimited space available.
*/
quota = UINT64_MAX;
parentspace = UINT64_MAX;
if (dd->dd_parent != NULL) {
parentspace = dsl_dir_space_available(dd->dd_parent,
ancestor, delta, ondiskonly);
}
mutex_enter(&dd->dd_lock);
if (dd->dd_phys->dd_quota != 0)
quota = dd->dd_phys->dd_quota;
if (ondiskonly) {
used = dd->dd_used_bytes;
} else {
used = dsl_dir_estimated_space(dd);
}
if (dd == ancestor)
used += delta;
if (dd->dd_parent == NULL) {
uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool, B_FALSE);
quota = MIN(quota, poolsize);
}
if (dd->dd_phys->dd_reserved > used && parentspace != UINT64_MAX) {
/*
* We have some space reserved, in addition to what our
* parent gave us.
*/
parentspace += dd->dd_phys->dd_reserved - used;
}
if (used > quota) {
/* over quota */
myspace = 0;
#ifdef ZFS_DEBUG
{
/*
* While it's OK to be a little over quota, if
* we think we are using more space than there
* is in the pool (which is already 6% more than
* dsl_pool_adjustedsize()), something is very
* wrong.
*/
uint64_t space = spa_get_space(dd->dd_pool->dp_spa);
ASSERT3U(used, <=, space);
}
#endif
} else {
/*
* the lesser of parent's space and the space
* left in our quota
*/
myspace = MIN(parentspace, quota - used);
}
mutex_exit(&dd->dd_lock);
return (myspace);
}
struct tempreserve {
list_node_t tr_node;
dsl_dir_t *tr_ds;
uint64_t tr_size;
};
/*
* Reserve space in this dsl_dir, to be used in this tx's txg.
* After the space has been dirtied (and thus
* dsl_dir_willuse_space() has been called), the reservation should
* be canceled, using dsl_dir_tempreserve_clear().
*/
static int
dsl_dir_tempreserve_impl(dsl_dir_t *dd,
uint64_t asize, boolean_t netfree, list_t *tr_list, dmu_tx_t *tx)
{
uint64_t txg = tx->tx_txg;
uint64_t est_used, quota, parent_rsrv;
int edquot = EDQUOT;
int txgidx = txg & TXG_MASK;
int i;
struct tempreserve *tr;
ASSERT3U(txg, !=, 0);
mutex_enter(&dd->dd_lock);
/*
* Check against the dsl_dir's quota. We don't add in the delta
* when checking for over-quota because they get one free hit.
*/
est_used = dsl_dir_estimated_space(dd);
for (i = 0; i < TXG_SIZE; i++)
est_used += dd->dd_tempreserved[i];
quota = UINT64_MAX;
if (dd->dd_phys->dd_quota)
quota = dd->dd_phys->dd_quota;
/*
* If this transaction will result in a net free of space, we want
* to let it through, but we have to be careful: the space that it
* frees won't become available until *after* this txg syncs.
* Therefore, to ensure that it's possible to remove files from
* a full pool without inducing transient overcommits, we throttle
* netfree transactions against a quota that is slightly larger,
* but still within the pool's allocation slop. In cases where
* we're very close to full, this will allow a steady trickle of
* removes to get through.
*/
if (dd->dd_parent == NULL) {
uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool, netfree);
if (poolsize < quota) {
quota = poolsize;
edquot = ENOSPC;
}
} else if (netfree) {
quota = UINT64_MAX;
}
/*
* If they are requesting more space, and our current estimate
* is over quota. They get to try again unless the actual
* on-disk is over quota.
*/
if (asize > 0 && est_used > quota) {
if (dd->dd_used_bytes < quota)
edquot = ERESTART;
dprintf_dd(dd, "failing: used=%lluK est_used = %lluK "
"quota=%lluK tr=%lluK err=%d\n",
dd->dd_used_bytes>>10, est_used>>10,
quota>>10, asize>>10, edquot);
mutex_exit(&dd->dd_lock);
return (edquot);
}
/* We need to up our estimated delta before dropping dd_lock */
dd->dd_tempreserved[txgidx] += asize;
parent_rsrv = parent_delta(dd, est_used, asize);
mutex_exit(&dd->dd_lock);
tr = kmem_alloc(sizeof (struct tempreserve), KM_SLEEP);
tr->tr_ds = dd;
tr->tr_size = asize;
list_insert_tail(tr_list, tr);
/* see if it's OK with our parent */
if (dd->dd_parent && parent_rsrv) {
return (dsl_dir_tempreserve_impl(dd->dd_parent,
parent_rsrv, netfree, tr_list, tx));
} else {
return (0);
}
}
/*
* Reserve space in this dsl_dir, to be used in this tx's txg.
* After the space has been dirtied (and thus
* dsl_dir_willuse_space() has been called), the reservation should
* be canceled, using dsl_dir_tempreserve_clear().
*/
int
dsl_dir_tempreserve_space(dsl_dir_t *dd, uint64_t lsize,
uint64_t asize, uint64_t fsize, void **tr_cookiep, dmu_tx_t *tx)
{
int err = 0;
list_t *tr_list;
tr_list = kmem_alloc(sizeof (list_t), KM_SLEEP);
list_create(tr_list, sizeof (struct tempreserve),
offsetof(struct tempreserve, tr_node));
err = dsl_dir_tempreserve_impl(dd, asize, fsize >= asize,
tr_list, tx);
if (err == 0) {
struct tempreserve *tr;
err = arc_tempreserve_space(lsize);
if (err == 0) {
tr = kmem_alloc(sizeof (struct tempreserve), KM_SLEEP);
tr->tr_ds = NULL;
tr->tr_size = lsize;
list_insert_tail(tr_list, tr);
}
}
if (err)
dsl_dir_tempreserve_clear(tr_list, tx);
else
*tr_cookiep = tr_list;
return (err);
}
/*
* Clear a temporary reservation that we previously made with
* dsl_dir_tempreserve_space().
*/
void
dsl_dir_tempreserve_clear(void *tr_cookie, dmu_tx_t *tx)
{
int txgidx = tx->tx_txg & TXG_MASK;
list_t *tr_list = tr_cookie;
struct tempreserve *tr;
ASSERT3U(tx->tx_txg, !=, 0);
while (tr = list_head(tr_list)) {
if (tr->tr_ds == NULL) {
arc_tempreserve_clear(tr->tr_size);
} else {
mutex_enter(&tr->tr_ds->dd_lock);
ASSERT3U(tr->tr_ds->dd_tempreserved[txgidx], >=,
tr->tr_size);
tr->tr_ds->dd_tempreserved[txgidx] -= tr->tr_size;
mutex_exit(&tr->tr_ds->dd_lock);
}
list_remove(tr_list, tr);
kmem_free(tr, sizeof (struct tempreserve));
}
kmem_free(tr_list, sizeof (list_t));
}
/*
* Call in open context when we think we're going to write/free space,
* eg. when dirtying data. Be conservative (ie. OK to write less than
* this or free more than this, but don't write more or free less).
*/
void
dsl_dir_willuse_space(dsl_dir_t *dd, int64_t space, dmu_tx_t *tx)
{
int64_t parent_space;
uint64_t est_used;
mutex_enter(&dd->dd_lock);
if (space > 0)
dd->dd_space_towrite[tx->tx_txg & TXG_MASK] += space;
est_used = dsl_dir_estimated_space(dd);
parent_space = parent_delta(dd, est_used, space);
mutex_exit(&dd->dd_lock);
/* Make sure that we clean up dd_space_to* */
dsl_dir_dirty(dd, tx);
/* XXX this is potentially expensive and unnecessary... */
if (parent_space && dd->dd_parent)
dsl_dir_willuse_space(dd->dd_parent, parent_space, tx);
}
/* call from syncing context when we actually write/free space for this dd */
void
dsl_dir_diduse_space(dsl_dir_t *dd,
int64_t used, int64_t compressed, int64_t uncompressed, dmu_tx_t *tx)
{
int64_t accounted_delta;
ASSERT(dmu_tx_is_syncing(tx));
dsl_dir_dirty(dd, tx);
mutex_enter(&dd->dd_lock);
accounted_delta = parent_delta(dd, dd->dd_used_bytes, used);
ASSERT(used >= 0 || dd->dd_used_bytes >= -used);
ASSERT(compressed >= 0 ||
dd->dd_phys->dd_compressed_bytes >= -compressed);
ASSERT(uncompressed >= 0 ||
dd->dd_phys->dd_uncompressed_bytes >= -uncompressed);
dd->dd_used_bytes += used;
if (used > 0)
dd->dd_space_towrite[tx->tx_txg & TXG_MASK] -= used;
dd->dd_phys->dd_uncompressed_bytes += uncompressed;
dd->dd_phys->dd_compressed_bytes += compressed;
mutex_exit(&dd->dd_lock);
if (dd->dd_parent != NULL) {
dsl_dir_diduse_space(dd->dd_parent,
accounted_delta, compressed, uncompressed, tx);
}
}
static int
dsl_dir_set_quota_sync(dsl_dir_t *dd, void *arg, dmu_tx_t *tx)
{
uint64_t *quotap = arg;
uint64_t new_quota = *quotap;
int err = 0;
dmu_buf_will_dirty(dd->dd_dbuf, tx);
mutex_enter(&dd->dd_lock);
if (new_quota != 0 && (new_quota < dd->dd_phys->dd_reserved ||
new_quota < dsl_dir_estimated_space(dd))) {
err = ENOSPC;
} else {
dd->dd_phys->dd_quota = new_quota;
}
mutex_exit(&dd->dd_lock);
return (err);
}
int
dsl_dir_set_quota(const char *ddname, uint64_t quota)
{
dsl_dir_t *dd;
int err;
dd = dsl_dir_open(ddname, FTAG, NULL);
if (dd == NULL)
return (ENOENT);
/*
* If someone removes a file, then tries to set the quota, we
* want to make sure the file freeing takes effect.
*/
txg_wait_open(dd->dd_pool, 0);
err = dsl_dir_sync_task(dd, dsl_dir_set_quota_sync, &quota, 0);
dsl_dir_close(dd, FTAG);
return (err);
}
static int
dsl_dir_set_reservation_sync(dsl_dir_t *dd, void *arg, dmu_tx_t *tx)
{
uint64_t *reservationp = arg;
uint64_t new_reservation = *reservationp;
uint64_t used, avail;
int64_t delta;
if (new_reservation > INT64_MAX)
return (EOVERFLOW);
mutex_enter(&dd->dd_lock);
used = dd->dd_used_bytes;
delta = MAX(used, new_reservation) -
MAX(used, dd->dd_phys->dd_reserved);
mutex_exit(&dd->dd_lock);
if (dd->dd_parent) {
avail = dsl_dir_space_available(dd->dd_parent,
NULL, 0, FALSE);
} else {
avail = dsl_pool_adjustedsize(dd->dd_pool, B_FALSE) - used;
}
if (delta > 0 && delta > avail)
return (ENOSPC);
if (delta > 0 && dd->dd_phys->dd_quota > 0 &&
new_reservation > dd->dd_phys->dd_quota)
return (ENOSPC);
dmu_buf_will_dirty(dd->dd_dbuf, tx);
dd->dd_phys->dd_reserved = new_reservation;
if (dd->dd_parent != NULL) {
/* Roll up this additional usage into our ancestors */
dsl_dir_diduse_space(dd->dd_parent, delta, 0, 0, tx);
}
return (0);
}
int
dsl_dir_set_reservation(const char *ddname, uint64_t reservation)
{
dsl_dir_t *dd;
int err;
dd = dsl_dir_open(ddname, FTAG, NULL);
if (dd == NULL)
return (ENOENT);
err = dsl_dir_sync_task(dd,
dsl_dir_set_reservation_sync, &reservation, 0);
dsl_dir_close(dd, FTAG);
return (err);
}
static dsl_dir_t *
closest_common_ancestor(dsl_dir_t *ds1, dsl_dir_t *ds2)
{
for (; ds1; ds1 = ds1->dd_parent) {
dsl_dir_t *dd;
for (dd = ds2; dd; dd = dd->dd_parent) {
if (ds1 == dd)
return (dd);
}
}
return (NULL);
}
/*
* If delta is applied to dd, how much of that delta would be applied to
* ancestor? Syncing context only.
*/
static int64_t
would_change(dsl_dir_t *dd, int64_t delta, dsl_dir_t *ancestor)
{
if (dd == ancestor)
return (delta);
mutex_enter(&dd->dd_lock);
delta = parent_delta(dd, dd->dd_used_bytes, delta);
mutex_exit(&dd->dd_lock);
return (would_change(dd->dd_parent, delta, ancestor));
}
int
dsl_dir_rename_sync(dsl_dir_t *dd, void *arg, dmu_tx_t *tx)
{
const char *newname = arg;
dsl_pool_t *dp = dd->dd_pool;
objset_t *mos = dp->dp_meta_objset;
dsl_dir_t *newpds;
const char *tail;
int err, len;
/* can't rename to different pool */
len = strlen(dp->dp_root_dir->dd_myname);
if (strncmp(dp->dp_root_dir->dd_myname, newname, len != 0) ||
newname[len] != '/') {
return (ENXIO);
}
newpds = dsl_dir_open_spa(dp->dp_spa, newname, FTAG, &tail);
/* new parent should exist */
if (newpds == NULL)
return (ENOENT);
/* new name should not already exist */
if (tail == NULL) {
dsl_dir_close(newpds, FTAG);
return (EEXIST);
}
rw_enter(&dp->dp_config_rwlock, RW_WRITER);
/* There should be 2 references: the open and the dirty */
if (dmu_buf_refcount(dd->dd_dbuf) > 2) {
rw_exit(&dp->dp_config_rwlock);
dsl_dir_close(newpds, FTAG);
return (EBUSY);
}
if (newpds != dd->dd_parent) {
dsl_dir_t *ancestor;
int64_t adelta;
uint64_t myspace, avail;
ancestor = closest_common_ancestor(dd, newpds);
/* no rename into our descendent */
if (ancestor == dd) {
dsl_dir_close(newpds, FTAG);
rw_exit(&dp->dp_config_rwlock);
return (EINVAL);
}
myspace = MAX(dd->dd_used_bytes, dd->dd_phys->dd_reserved);
adelta = would_change(dd->dd_parent, -myspace, ancestor);
avail = dsl_dir_space_available(newpds,
ancestor, adelta, FALSE);
if (avail < myspace) {
dsl_dir_close(newpds, FTAG);
rw_exit(&dp->dp_config_rwlock);
return (ENOSPC);
}
/* The point of no (unsuccessful) return */
dsl_dir_diduse_space(dd->dd_parent, -myspace,
-dd->dd_phys->dd_compressed_bytes,
-dd->dd_phys->dd_uncompressed_bytes, tx);
dsl_dir_diduse_space(newpds, myspace,
dd->dd_phys->dd_compressed_bytes,
dd->dd_phys->dd_uncompressed_bytes, tx);
}
/* The point of no (unsuccessful) return */
dmu_buf_will_dirty(dd->dd_dbuf, tx);
/* remove from old parent zapobj */
err = zap_remove(mos, dd->dd_parent->dd_phys->dd_child_dir_zapobj,
dd->dd_myname, tx);
ASSERT3U(err, ==, 0);
(void) strcpy(dd->dd_myname, tail);
dsl_dir_close(dd->dd_parent, dd);
dd->dd_phys->dd_parent_obj = newpds->dd_object;
dd->dd_parent = dsl_dir_open_obj(dd->dd_pool,
newpds->dd_object, NULL, dd);
/* add to new parent zapobj */
err = zap_add(mos, newpds->dd_phys->dd_child_dir_zapobj,
dd->dd_myname, 8, 1, &dd->dd_object, tx);
ASSERT3U(err, ==, 0);
dsl_dir_close(newpds, FTAG);
rw_exit(&dp->dp_config_rwlock);
return (0);
}