*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012 by Delphix. All rights reserved.
+ * Copyright (c) 2013 by Delphix. All rights reserved.
* Copyright (c) 2012, Joyent, Inc. All rights reserved.
+ * Copyright (c) 2014 RackTop Systems.
*/
#include <sys/dmu_objset.h>
#include <sys/zvol.h>
#include <sys/dsl_scan.h>
#include <sys/dsl_deadlist.h>
-
-static char *dsl_reaper = "the grim reaper";
-
-static dsl_checkfunc_t dsl_dataset_destroy_begin_check;
-static dsl_syncfunc_t dsl_dataset_destroy_begin_sync;
-static dsl_syncfunc_t dsl_dataset_set_reservation_sync;
+#include <sys/dsl_destroy.h>
+#include <sys/dsl_userhold.h>
+#include <sys/dsl_bookmark.h>
#define SWITCH64(x, y) \
{ \
#define DSL_DEADLIST_BLOCKSIZE SPA_MAXBLOCKSIZE
-#define DSL_DATASET_IS_DESTROYED(ds) ((ds)->ds_owner == dsl_reaper)
-
-
/*
* Figure out how much of this delta should be propogated to the dsl_dir
* layer. If there's a refreservation, that space has already been
used, compressed, uncompressed);
return;
}
- dmu_buf_will_dirty(ds->ds_dbuf, tx);
- mutex_enter(&ds->ds_dir->dd_lock);
+ dmu_buf_will_dirty(ds->ds_dbuf, tx);
mutex_enter(&ds->ds_lock);
delta = parent_delta(ds, used);
ds->ds_phys->ds_referenced_bytes += used;
compressed, uncompressed, tx);
dsl_dir_transfer_space(ds->ds_dir, used - delta,
DD_USED_REFRSRV, DD_USED_HEAD, tx);
- mutex_exit(&ds->ds_dir->dd_lock);
}
int
dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx,
boolean_t async)
{
- int used, compressed, uncompressed;
+ int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
+ int compressed = BP_GET_PSIZE(bp);
+ int uncompressed = BP_GET_UCSIZE(bp);
if (BP_IS_HOLE(bp))
return (0);
ASSERT(dmu_tx_is_syncing(tx));
ASSERT(bp->blk_birth <= tx->tx_txg);
- used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
- compressed = BP_GET_PSIZE(bp);
- uncompressed = BP_GET_UCSIZE(bp);
-
- ASSERT(used > 0);
if (ds == NULL) {
dsl_free(tx->tx_pool, tx->tx_txg, bp);
dsl_pool_mos_diduse_space(tx->tx_pool,
dprintf_bp(bp, "freeing ds=%llu", ds->ds_object);
dsl_free(tx->tx_pool, tx->tx_txg, bp);
- mutex_enter(&ds->ds_dir->dd_lock);
mutex_enter(&ds->ds_lock);
ASSERT(ds->ds_phys->ds_unique_bytes >= used ||
!DS_UNIQUE_IS_ACCURATE(ds));
delta, -compressed, -uncompressed, tx);
dsl_dir_transfer_space(ds->ds_dir, -used - delta,
DD_USED_REFRSRV, DD_USED_HEAD, tx);
- mutex_exit(&ds->ds_dir->dd_lock);
} else {
dprintf_bp(bp, "putting on dead list: %s", "");
if (async) {
dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp,
uint64_t blk_birth)
{
- if (blk_birth <= dsl_dataset_prev_snap_txg(ds))
+ if (blk_birth <= dsl_dataset_prev_snap_txg(ds) ||
+ (bp != NULL && BP_IS_HOLE(bp)))
return (B_FALSE);
ddt_prefetch(dsl_dataset_get_spa(ds), bp);
{
dsl_dataset_t *ds = dsv;
- ASSERT(ds->ds_owner == NULL || DSL_DATASET_IS_DESTROYED(ds));
+ ASSERT(ds->ds_owner == NULL);
unique_remove(ds->ds_fsid_guid);
dmu_objset_evict(ds->ds_objset);
if (ds->ds_prev) {
- dsl_dataset_drop_ref(ds->ds_prev, ds);
+ dsl_dataset_rele(ds->ds_prev, ds);
ds->ds_prev = NULL;
}
bplist_destroy(&ds->ds_pending_deadlist);
- if (db != NULL) {
+ if (ds->ds_phys->ds_deadlist_obj != 0)
dsl_deadlist_close(&ds->ds_deadlist);
- } else {
- ASSERT(ds->ds_deadlist.dl_dbuf == NULL);
- ASSERT(!ds->ds_deadlist.dl_oldfmt);
- }
if (ds->ds_dir)
- dsl_dir_close(ds->ds_dir, ds);
+ dsl_dir_rele(ds->ds_dir, ds);
ASSERT(!list_link_active(&ds->ds_synced_link));
mutex_destroy(&ds->ds_lock);
- mutex_destroy(&ds->ds_recvlock);
mutex_destroy(&ds->ds_opening_lock);
- rw_destroy(&ds->ds_rwlock);
- cv_destroy(&ds->ds_exclusive_cv);
+ refcount_destroy(&ds->ds_longholds);
kmem_free(ds, sizeof (dsl_dataset_t));
}
-static int
+int
dsl_dataset_get_snapname(dsl_dataset_t *ds)
{
dsl_dataset_phys_t *headphys;
err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj,
FTAG, &headdbuf);
- if (err)
+ if (err != 0)
return (err);
headphys = headdbuf->db_data;
err = zap_value_search(dp->dp_meta_objset,
return (err);
}
-static int
-dsl_dataset_snap_remove(dsl_dataset_t *ds, char *name, dmu_tx_t *tx)
+int
+dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx)
{
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj;
return (err);
}
-static int
-dsl_dataset_get_ref(dsl_pool_t *dp, uint64_t dsobj, void *tag,
+int
+dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag,
dsl_dataset_t **dsp)
{
objset_t *mos = dp->dp_meta_objset;
int err;
dmu_object_info_t doi;
- ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) ||
- dsl_pool_sync_context(dp));
+ ASSERT(dsl_pool_config_held(dp));
err = dmu_bonus_hold(mos, dsobj, tag, &dbuf);
- if (err)
+ if (err != 0)
return (err);
/* Make sure dsobj has the correct object type. */
dmu_object_info_from_db(dbuf, &doi);
- if (doi.doi_type != DMU_OT_DSL_DATASET)
- return (EINVAL);
+ if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) {
+ dmu_buf_rele(dbuf, tag);
+ return (SET_ERROR(EINVAL));
+ }
ds = dmu_buf_get_user(dbuf);
if (ds == NULL) {
dsl_dataset_t *winner = NULL;
- ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_PUSHPAGE);
+ ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP);
ds->ds_dbuf = dbuf;
ds->ds_object = dsobj;
ds->ds_phys = dbuf->db_data;
list_link_init(&ds->ds_synced_link);
mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL);
- mutex_init(&ds->ds_recvlock, NULL, MUTEX_DEFAULT, NULL);
mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL);
mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL);
-
- rw_init(&ds->ds_rwlock, NULL, RW_DEFAULT, NULL);
- cv_init(&ds->ds_exclusive_cv, NULL, CV_DEFAULT, NULL);
+ refcount_create(&ds->ds_longholds);
bplist_create(&ds->ds_pending_deadlist);
dsl_deadlist_open(&ds->ds_deadlist,
offsetof(dmu_sendarg_t, dsa_link));
if (err == 0) {
- err = dsl_dir_open_obj(dp,
+ err = dsl_dir_hold_obj(dp,
ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir);
}
- if (err) {
+ if (err != 0) {
mutex_destroy(&ds->ds_lock);
- mutex_destroy(&ds->ds_recvlock);
mutex_destroy(&ds->ds_opening_lock);
- rw_destroy(&ds->ds_rwlock);
- cv_destroy(&ds->ds_exclusive_cv);
+ refcount_destroy(&ds->ds_longholds);
bplist_destroy(&ds->ds_pending_deadlist);
dsl_deadlist_close(&ds->ds_deadlist);
kmem_free(ds, sizeof (dsl_dataset_t));
if (!dsl_dataset_is_snapshot(ds)) {
ds->ds_snapname[0] = '\0';
- if (ds->ds_phys->ds_prev_snap_obj) {
- err = dsl_dataset_get_ref(dp,
+ if (ds->ds_phys->ds_prev_snap_obj != 0) {
+ err = dsl_dataset_hold_obj(dp,
ds->ds_phys->ds_prev_snap_obj,
ds, &ds->ds_prev);
}
+ if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
+ int zaperr = zap_lookup(mos, ds->ds_object,
+ DS_FIELD_BOOKMARK_NAMES,
+ sizeof (ds->ds_bookmarks), 1,
+ &ds->ds_bookmarks);
+ if (zaperr != ENOENT)
+ VERIFY0(zaperr);
+ }
} else {
if (zfs_flags & ZFS_DEBUG_SNAPNAMES)
err = dsl_dataset_get_snapname(ds);
}
if (err == 0 && !dsl_dataset_is_snapshot(ds)) {
- /*
- * In sync context, we're called with either no lock
- * or with the write lock. If we're not syncing,
- * we're always called with the read lock held.
- */
- boolean_t need_lock =
- !RW_WRITE_HELD(&dp->dp_config_rwlock) &&
- dsl_pool_sync_context(dp);
-
- if (need_lock)
- rw_enter(&dp->dp_config_rwlock, RW_READER);
-
- err = dsl_prop_get_ds(ds,
- "refreservation", sizeof (uint64_t), 1,
- &ds->ds_reserved, NULL);
+ err = dsl_prop_get_int_ds(ds,
+ zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
+ &ds->ds_reserved);
if (err == 0) {
- err = dsl_prop_get_ds(ds,
- "refquota", sizeof (uint64_t), 1,
- &ds->ds_quota, NULL);
+ err = dsl_prop_get_int_ds(ds,
+ zfs_prop_to_name(ZFS_PROP_REFQUOTA),
+ &ds->ds_quota);
}
-
- if (need_lock)
- rw_exit(&dp->dp_config_rwlock);
} else {
ds->ds_reserved = ds->ds_quota = 0;
}
- if (err == 0) {
- winner = dmu_buf_set_user_ie(dbuf, ds, &ds->ds_phys,
- dsl_dataset_evict);
- }
- if (err || winner) {
+ if (err != 0 || (winner = dmu_buf_set_user_ie(dbuf, ds,
+ &ds->ds_phys, dsl_dataset_evict)) != NULL) {
bplist_destroy(&ds->ds_pending_deadlist);
dsl_deadlist_close(&ds->ds_deadlist);
if (ds->ds_prev)
- dsl_dataset_drop_ref(ds->ds_prev, ds);
- dsl_dir_close(ds->ds_dir, ds);
+ dsl_dataset_rele(ds->ds_prev, ds);
+ dsl_dir_rele(ds->ds_dir, ds);
mutex_destroy(&ds->ds_lock);
- mutex_destroy(&ds->ds_recvlock);
mutex_destroy(&ds->ds_opening_lock);
- rw_destroy(&ds->ds_rwlock);
- cv_destroy(&ds->ds_exclusive_cv);
+ refcount_destroy(&ds->ds_longholds);
kmem_free(ds, sizeof (dsl_dataset_t));
- if (err) {
+ if (err != 0) {
dmu_buf_rele(dbuf, tag);
return (err);
}
ASSERT(ds->ds_phys->ds_prev_snap_obj != 0 ||
spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN ||
dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap);
- mutex_enter(&ds->ds_lock);
- if (!dsl_pool_sync_context(dp) && DSL_DATASET_IS_DESTROYED(ds)) {
- mutex_exit(&ds->ds_lock);
- dmu_buf_rele(ds->ds_dbuf, tag);
- return (ENOENT);
- }
- mutex_exit(&ds->ds_lock);
*dsp = ds;
return (0);
}
-static int
-dsl_dataset_hold_ref(dsl_dataset_t *ds, void *tag)
-{
- dsl_pool_t *dp = ds->ds_dir->dd_pool;
-
- /*
- * In syncing context we don't want the rwlock lock: there
- * may be an existing writer waiting for sync phase to
- * finish. We don't need to worry about such writers, since
- * sync phase is single-threaded, so the writer can't be
- * doing anything while we are active.
- */
- if (dsl_pool_sync_context(dp)) {
- ASSERT(!DSL_DATASET_IS_DESTROYED(ds));
- return (0);
- }
-
- /*
- * Normal users will hold the ds_rwlock as a READER until they
- * are finished (i.e., call dsl_dataset_rele()). "Owners" will
- * drop their READER lock after they set the ds_owner field.
- *
- * If the dataset is being destroyed, the destroy thread will
- * obtain a WRITER lock for exclusive access after it's done its
- * open-context work and then change the ds_owner to
- * dsl_reaper once destruction is assured. So threads
- * may block here temporarily, until the "destructability" of
- * the dataset is determined.
- */
- ASSERT(!RW_WRITE_HELD(&dp->dp_config_rwlock));
- mutex_enter(&ds->ds_lock);
- while (!rw_tryenter(&ds->ds_rwlock, RW_READER)) {
- rw_exit(&dp->dp_config_rwlock);
- cv_wait(&ds->ds_exclusive_cv, &ds->ds_lock);
- if (DSL_DATASET_IS_DESTROYED(ds)) {
- mutex_exit(&ds->ds_lock);
- dsl_dataset_drop_ref(ds, tag);
- rw_enter(&dp->dp_config_rwlock, RW_READER);
- return (ENOENT);
- }
- /*
- * The dp_config_rwlock lives above the ds_lock. And
- * we need to check DSL_DATASET_IS_DESTROYED() while
- * holding the ds_lock, so we have to drop and reacquire
- * the ds_lock here.
- */
- mutex_exit(&ds->ds_lock);
- rw_enter(&dp->dp_config_rwlock, RW_READER);
- mutex_enter(&ds->ds_lock);
- }
- mutex_exit(&ds->ds_lock);
- return (0);
-}
-
-int
-dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag,
- dsl_dataset_t **dsp)
-{
- int err = dsl_dataset_get_ref(dp, dsobj, tag, dsp);
-
- if (err)
- return (err);
- return (dsl_dataset_hold_ref(*dsp, tag));
-}
-
int
-dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, boolean_t inconsistentok,
+dsl_dataset_hold(dsl_pool_t *dp, const char *name,
void *tag, dsl_dataset_t **dsp)
-{
- int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp);
- if (err)
- return (err);
- if (!dsl_dataset_tryown(*dsp, inconsistentok, tag)) {
- dsl_dataset_rele(*dsp, tag);
- *dsp = NULL;
- return (EBUSY);
- }
- return (0);
-}
-
-int
-dsl_dataset_hold(const char *name, void *tag, dsl_dataset_t **dsp)
{
dsl_dir_t *dd;
- dsl_pool_t *dp;
const char *snapname;
uint64_t obj;
int err = 0;
- err = dsl_dir_open_spa(NULL, name, FTAG, &dd, &snapname);
- if (err)
+ err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname);
+ if (err != 0)
return (err);
- dp = dd->dd_pool;
+ ASSERT(dsl_pool_config_held(dp));
obj = dd->dd_phys->dd_head_dataset_obj;
- rw_enter(&dp->dp_config_rwlock, RW_READER);
- if (obj)
- err = dsl_dataset_get_ref(dp, obj, tag, dsp);
+ if (obj != 0)
+ err = dsl_dataset_hold_obj(dp, obj, tag, dsp);
else
- err = ENOENT;
- if (err)
- goto out;
-
- err = dsl_dataset_hold_ref(*dsp, tag);
+ err = SET_ERROR(ENOENT);
/* we may be looking for a snapshot */
if (err == 0 && snapname != NULL) {
- dsl_dataset_t *ds = NULL;
+ dsl_dataset_t *ds;
if (*snapname++ != '@') {
dsl_dataset_rele(*dsp, tag);
- err = ENOENT;
- goto out;
+ dsl_dir_rele(dd, FTAG);
+ return (SET_ERROR(ENOENT));
}
dprintf("looking for snapshot '%s'\n", snapname);
err = dsl_dataset_snap_lookup(*dsp, snapname, &obj);
if (err == 0)
- err = dsl_dataset_get_ref(dp, obj, tag, &ds);
+ err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
dsl_dataset_rele(*dsp, tag);
- ASSERT3U((err == 0), ==, (ds != NULL));
-
- if (ds) {
+ if (err == 0) {
mutex_enter(&ds->ds_lock);
if (ds->ds_snapname[0] == 0)
(void) strlcpy(ds->ds_snapname, snapname,
sizeof (ds->ds_snapname));
mutex_exit(&ds->ds_lock);
- err = dsl_dataset_hold_ref(ds, tag);
- *dsp = err ? NULL : ds;
+ *dsp = ds;
}
}
-out:
- rw_exit(&dp->dp_config_rwlock);
- dsl_dir_close(dd, FTAG);
+
+ dsl_dir_rele(dd, FTAG);
return (err);
}
int
-dsl_dataset_own(const char *name, boolean_t inconsistentok,
+dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj,
+ void *tag, dsl_dataset_t **dsp)
+{
+ int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp);
+ if (err != 0)
+ return (err);
+ if (!dsl_dataset_tryown(*dsp, tag)) {
+ dsl_dataset_rele(*dsp, tag);
+ *dsp = NULL;
+ return (SET_ERROR(EBUSY));
+ }
+ return (0);
+}
+
+int
+dsl_dataset_own(dsl_pool_t *dp, const char *name,
void *tag, dsl_dataset_t **dsp)
{
- int err = dsl_dataset_hold(name, tag, dsp);
- if (err)
+ int err = dsl_dataset_hold(dp, name, tag, dsp);
+ if (err != 0)
return (err);
- if (!dsl_dataset_tryown(*dsp, inconsistentok, tag)) {
+ if (!dsl_dataset_tryown(*dsp, tag)) {
dsl_dataset_rele(*dsp, tag);
- return (EBUSY);
+ return (SET_ERROR(EBUSY));
}
return (0);
}
+/*
+ * See the comment above dsl_pool_hold() for details. In summary, a long
+ * hold is used to prevent destruction of a dataset while the pool hold
+ * is dropped, allowing other concurrent operations (e.g. spa_sync()).
+ *
+ * The dataset and pool must be held when this function is called. After it
+ * is called, the pool hold may be released while the dataset is still held
+ * and accessed.
+ */
+void
+dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag)
+{
+ ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
+ (void) refcount_add(&ds->ds_longholds, tag);
+}
+
+void
+dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag)
+{
+ (void) refcount_remove(&ds->ds_longholds, tag);
+}
+
+/* Return B_TRUE if there are any long holds on this dataset. */
+boolean_t
+dsl_dataset_long_held(dsl_dataset_t *ds)
+{
+ return (!refcount_is_zero(&ds->ds_longholds));
+}
+
void
dsl_dataset_name(dsl_dataset_t *ds, char *name)
{
(void) strcpy(name, "mos");
} else {
dsl_dir_name(ds->ds_dir, name);
- VERIFY(0 == dsl_dataset_get_snapname(ds));
+ VERIFY0(dsl_dataset_get_snapname(ds));
if (ds->ds_snapname[0]) {
(void) strcat(name, "@");
/*
}
}
-static int
-dsl_dataset_namelen(dsl_dataset_t *ds)
-{
- int result;
-
- if (ds == NULL) {
- result = 3; /* "mos" */
- } else {
- result = dsl_dir_namelen(ds->ds_dir);
- VERIFY(0 == dsl_dataset_get_snapname(ds));
- if (ds->ds_snapname[0]) {
- ++result; /* adding one for the @-sign */
- if (!MUTEX_HELD(&ds->ds_lock)) {
- mutex_enter(&ds->ds_lock);
- result += strlen(ds->ds_snapname);
- mutex_exit(&ds->ds_lock);
- } else {
- result += strlen(ds->ds_snapname);
- }
- }
- }
-
- return (result);
-}
-
-void
-dsl_dataset_drop_ref(dsl_dataset_t *ds, void *tag)
-{
- dmu_buf_rele(ds->ds_dbuf, tag);
-}
-
void
dsl_dataset_rele(dsl_dataset_t *ds, void *tag)
{
- if (!dsl_pool_sync_context(ds->ds_dir->dd_pool)) {
- rw_exit(&ds->ds_rwlock);
- }
- dsl_dataset_drop_ref(ds, tag);
+ dmu_buf_rele(ds->ds_dbuf, tag);
}
void
dsl_dataset_disown(dsl_dataset_t *ds, void *tag)
{
- ASSERT((ds->ds_owner == tag && ds->ds_dbuf) ||
- (DSL_DATASET_IS_DESTROYED(ds) && ds->ds_dbuf == NULL));
+ ASSERT(ds->ds_owner == tag && ds->ds_dbuf != NULL);
mutex_enter(&ds->ds_lock);
ds->ds_owner = NULL;
- if (RW_WRITE_HELD(&ds->ds_rwlock)) {
- rw_exit(&ds->ds_rwlock);
- cv_broadcast(&ds->ds_exclusive_cv);
- }
mutex_exit(&ds->ds_lock);
- if (ds->ds_dbuf)
- dsl_dataset_drop_ref(ds, tag);
+ dsl_dataset_long_rele(ds, tag);
+ if (ds->ds_dbuf != NULL)
+ dsl_dataset_rele(ds, tag);
else
dsl_dataset_evict(NULL, ds);
}
boolean_t
-dsl_dataset_tryown(dsl_dataset_t *ds, boolean_t inconsistentok, void *tag)
+dsl_dataset_tryown(dsl_dataset_t *ds, void *tag)
{
boolean_t gotit = FALSE;
mutex_enter(&ds->ds_lock);
- if (ds->ds_owner == NULL &&
- (!DS_IS_INCONSISTENT(ds) || inconsistentok)) {
+ if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) {
ds->ds_owner = tag;
- if (!dsl_pool_sync_context(ds->ds_dir->dd_pool))
- rw_exit(&ds->ds_rwlock);
+ dsl_dataset_long_hold(ds, tag);
gotit = TRUE;
}
mutex_exit(&ds->ds_lock);
return (gotit);
}
-void
-dsl_dataset_make_exclusive(dsl_dataset_t *ds, void *owner)
-{
- ASSERT3P(owner, ==, ds->ds_owner);
- if (!RW_WRITE_HELD(&ds->ds_rwlock))
- rw_enter(&ds->ds_rwlock, RW_WRITER);
-}
-
uint64_t
dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
uint64_t flags, dmu_tx_t *tx)
dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
- VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
+ VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
dmu_buf_will_dirty(dbuf, tx);
dsphys = dbuf->db_data;
bzero(dsphys, sizeof (dsl_dataset_phys_t));
if (origin == NULL) {
dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx);
} else {
- dsl_dataset_t *ohds;
+ dsl_dataset_t *ohds; /* head of the origin snapshot */
dsphys->ds_prev_snap_obj = origin->ds_object;
dsphys->ds_prev_snap_txg =
dsphys->ds_uncompressed_bytes =
origin->ds_phys->ds_uncompressed_bytes;
dsphys->ds_bp = origin->ds_phys->ds_bp;
- dsphys->ds_flags |= origin->ds_phys->ds_flags;
+
+ /*
+ * Inherit flags that describe the dataset's contents
+ * (INCONSISTENT) or properties (Case Insensitive).
+ */
+ dsphys->ds_flags |= origin->ds_phys->ds_flags &
+ (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET);
dmu_buf_will_dirty(origin->ds_dbuf, tx);
origin->ds_phys->ds_num_children++;
- VERIFY3U(0, ==, dsl_dataset_hold_obj(dp,
+ VERIFY0(dsl_dataset_hold_obj(dp,
origin->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &ohds));
dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist,
dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx);
zap_create(mos,
DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx);
}
- VERIFY(0 == zap_add_int(mos,
- origin->ds_phys->ds_next_clones_obj,
- dsobj, tx));
+ VERIFY0(zap_add_int(mos,
+ origin->ds_phys->ds_next_clones_obj, dsobj, tx));
}
dmu_buf_will_dirty(dd->dd_dbuf, tx);
zap_create(mos,
DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx);
}
- VERIFY3U(0, ==, zap_add_int(mos,
+ VERIFY0(zap_add_int(mos,
origin->ds_dir->dd_phys->dd_clones, dsobj, tx));
}
}
return (dsobj);
}
+static void
+dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx)
+{
+ objset_t *os;
+
+ VERIFY0(dmu_objset_from_ds(ds, &os));
+ bzero(&os->os_zil_header, sizeof (os->os_zil_header));
+ dsl_dataset_dirty(ds, tx);
+}
+
uint64_t
dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname,
dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx)
uint64_t dsobj, ddobj;
dsl_dir_t *dd;
+ ASSERT(dmu_tx_is_syncing(tx));
ASSERT(lastname[0] != '@');
ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx);
- VERIFY(0 == dsl_dir_open_obj(dp, ddobj, lastname, FTAG, &dd));
+ VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd));
- dsobj = dsl_dataset_create_sync_dd(dd, origin, flags, tx);
+ dsobj = dsl_dataset_create_sync_dd(dd, origin,
+ flags & ~DS_CREATE_FLAG_NODIRTY, tx);
dsl_deleg_set_create_perms(dd, tx, cr);
- dsl_dir_close(dd, FTAG);
+ dsl_dir_rele(dd, FTAG);
/*
* If we are creating a clone, make sure we zero out any stale
* data from the origin snapshots zil header.
*/
- if (origin != NULL) {
+ if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) {
dsl_dataset_t *ds;
- objset_t *os;
- VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
- VERIFY3U(0, ==, dmu_objset_from_ds(ds, &os));
- bzero(&os->os_zil_header, sizeof (os->os_zil_header));
- dsl_dataset_dirty(ds, tx);
+ VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
+ dsl_dataset_zero_zil(ds, tx);
dsl_dataset_rele(ds, FTAG);
}
}
/*
- * The snapshots must all be in the same pool.
+ * The unique space in the head dataset can be calculated by subtracting
+ * the space used in the most recent snapshot, that is still being used
+ * in this file system, from the space currently in use. To figure out
+ * the space in the most recent snapshot still in use, we need to take
+ * the total space used in the snapshot and subtract out the space that
+ * has been freed up since the snapshot was taken.
*/
-int
-dmu_snapshots_destroy_nvl(nvlist_t *snaps, boolean_t defer, char *failed)
+void
+dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds)
{
- int err;
- dsl_sync_task_t *dst;
- spa_t *spa;
- nvpair_t *pair;
- dsl_sync_task_group_t *dstg;
+ uint64_t mrs_used;
+ uint64_t dlused, dlcomp, dluncomp;
- pair = nvlist_next_nvpair(snaps, NULL);
- if (pair == NULL)
- return (0);
+ ASSERT(!dsl_dataset_is_snapshot(ds));
- err = spa_open(nvpair_name(pair), &spa, FTAG);
- if (err)
- return (err);
- dstg = dsl_sync_task_group_create(spa_get_dsl(spa));
+ if (ds->ds_phys->ds_prev_snap_obj != 0)
+ mrs_used = ds->ds_prev->ds_phys->ds_referenced_bytes;
+ else
+ mrs_used = 0;
- for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
- pair = nvlist_next_nvpair(snaps, pair)) {
- dsl_dataset_t *ds;
+ dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp);
- err = dsl_dataset_own(nvpair_name(pair), B_TRUE, dstg, &ds);
- if (err == 0) {
- struct dsl_ds_destroyarg *dsda;
-
- dsl_dataset_make_exclusive(ds, dstg);
- dsda = kmem_zalloc(sizeof (struct dsl_ds_destroyarg),
- KM_SLEEP);
- dsda->ds = ds;
- dsda->defer = defer;
- dsl_sync_task_create(dstg, dsl_dataset_destroy_check,
- dsl_dataset_destroy_sync, dsda, dstg, 0);
- } else if (err == ENOENT) {
- err = 0;
- } else {
- (void) strcpy(failed, nvpair_name(pair));
- break;
- }
- }
+ ASSERT3U(dlused, <=, mrs_used);
+ ds->ds_phys->ds_unique_bytes =
+ ds->ds_phys->ds_referenced_bytes - (mrs_used - dlused);
- if (err == 0)
- err = dsl_sync_task_group_wait(dstg);
+ if (spa_version(ds->ds_dir->dd_pool->dp_spa) >=
+ SPA_VERSION_UNIQUE_ACCURATE)
+ ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
+}
- for (dst = list_head(&dstg->dstg_tasks); dst;
- dst = list_next(&dstg->dstg_tasks, dst)) {
- struct dsl_ds_destroyarg *dsda = dst->dst_arg1;
- dsl_dataset_t *ds = dsda->ds;
+void
+dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
+ dmu_tx_t *tx)
+{
+ objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
+ int err;
+ ASSERTV(uint64_t count);
- /*
- * Return the file system name that triggered the error
- */
- if (dst->dst_err) {
- dsl_dataset_name(ds, failed);
- }
- ASSERT3P(dsda->rm_origin, ==, NULL);
- dsl_dataset_disown(ds, dstg);
- kmem_free(dsda, sizeof (struct dsl_ds_destroyarg));
- }
+ ASSERT(ds->ds_phys->ds_num_children >= 2);
+ err = zap_remove_int(mos, ds->ds_phys->ds_next_clones_obj, obj, tx);
+ /*
+ * The err should not be ENOENT, but a bug in a previous version
+ * of the code could cause upgrade_clones_cb() to not set
+ * ds_next_snap_obj when it should, leading to a missing entry.
+ * If we knew that the pool was created after
+ * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
+ * ENOENT. However, at least we can check that we don't have
+ * too many entries in the next_clones_obj even after failing to
+ * remove this one.
+ */
+ if (err != ENOENT)
+ VERIFY0(err);
+ ASSERT0(zap_count(mos, ds->ds_phys->ds_next_clones_obj,
+ &count));
+ ASSERT3U(count, <=, ds->ds_phys->ds_num_children - 2);
+}
- dsl_sync_task_group_destroy(dstg);
- spa_close(spa, FTAG);
- return (err);
+blkptr_t *
+dsl_dataset_get_blkptr(dsl_dataset_t *ds)
+{
+ return (&ds->ds_phys->ds_bp);
}
-static boolean_t
-dsl_dataset_might_destroy_origin(dsl_dataset_t *ds)
+void
+dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx)
{
- boolean_t might_destroy = B_FALSE;
-
- mutex_enter(&ds->ds_lock);
- if (ds->ds_phys->ds_num_children == 2 && ds->ds_userrefs == 0 &&
- DS_IS_DEFER_DESTROY(ds))
- might_destroy = B_TRUE;
- mutex_exit(&ds->ds_lock);
+ ASSERT(dmu_tx_is_syncing(tx));
+ /* If it's the meta-objset, set dp_meta_rootbp */
+ if (ds == NULL) {
+ tx->tx_pool->dp_meta_rootbp = *bp;
+ } else {
+ dmu_buf_will_dirty(ds->ds_dbuf, tx);
+ ds->ds_phys->ds_bp = *bp;
+ }
+}
- return (might_destroy);
+spa_t *
+dsl_dataset_get_spa(dsl_dataset_t *ds)
+{
+ return (ds->ds_dir->dd_pool->dp_spa);
}
-/*
- * If we're removing a clone, and these three conditions are true:
- * 1) the clone's origin has no other children
- * 2) the clone's origin has no user references
- * 3) the clone's origin has been marked for deferred destruction
- * Then, prepare to remove the origin as part of this sync task group.
- */
-static int
-dsl_dataset_origin_rm_prep(struct dsl_ds_destroyarg *dsda, void *tag)
+void
+dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx)
{
- dsl_dataset_t *ds = dsda->ds;
- dsl_dataset_t *origin = ds->ds_prev;
+ dsl_pool_t *dp;
- if (dsl_dataset_might_destroy_origin(origin)) {
- char *name;
- int namelen;
- int error;
-
- namelen = dsl_dataset_namelen(origin) + 1;
- name = kmem_alloc(namelen, KM_SLEEP);
- dsl_dataset_name(origin, name);
-#ifdef _KERNEL
- error = zfs_unmount_snap(name, NULL);
- if (error) {
- kmem_free(name, namelen);
- return (error);
- }
-#endif
- error = dsl_dataset_own(name, B_TRUE, tag, &origin);
- kmem_free(name, namelen);
- if (error)
- return (error);
- dsda->rm_origin = origin;
- dsl_dataset_make_exclusive(origin, tag);
- }
-
- return (0);
-}
-
-/*
- * ds must be opened as OWNER. On return (whether successful or not),
- * ds will be closed and caller can no longer dereference it.
- */
-int
-dsl_dataset_destroy(dsl_dataset_t *ds, void *tag, boolean_t defer)
-{
- int err;
- dsl_sync_task_group_t *dstg;
- objset_t *os;
- dsl_dir_t *dd;
- uint64_t obj;
- struct dsl_ds_destroyarg dsda = { 0 };
- dsl_dataset_t *dummy_ds;
-
- dsda.ds = ds;
-
- if (dsl_dataset_is_snapshot(ds)) {
- /* Destroying a snapshot is simpler */
- dsl_dataset_make_exclusive(ds, tag);
-
- dsda.defer = defer;
- err = dsl_sync_task_do(ds->ds_dir->dd_pool,
- dsl_dataset_destroy_check, dsl_dataset_destroy_sync,
- &dsda, tag, 0);
- ASSERT3P(dsda.rm_origin, ==, NULL);
- goto out;
- } else if (defer) {
- err = EINVAL;
- goto out;
- }
-
- dd = ds->ds_dir;
- dummy_ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP);
- dummy_ds->ds_dir = dd;
- dummy_ds->ds_object = ds->ds_object;
-
- if (!spa_feature_is_enabled(dsl_dataset_get_spa(ds),
- &spa_feature_table[SPA_FEATURE_ASYNC_DESTROY])) {
- /*
- * Check for errors and mark this ds as inconsistent, in
- * case we crash while freeing the objects.
- */
- err = dsl_sync_task_do(dd->dd_pool,
- dsl_dataset_destroy_begin_check,
- dsl_dataset_destroy_begin_sync, ds, NULL, 0);
- if (err)
- goto out_free;
-
- err = dmu_objset_from_ds(ds, &os);
- if (err)
- goto out_free;
-
- /*
- * Remove all objects while in the open context so that
- * there is less work to do in the syncing context.
- */
- for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE,
- ds->ds_phys->ds_prev_snap_txg)) {
- /*
- * Ignore errors, if there is not enough disk space
- * we will deal with it in dsl_dataset_destroy_sync().
- */
- (void) dmu_free_object(os, obj);
- }
- if (err != ESRCH)
- goto out_free;
-
- /*
- * Sync out all in-flight IO.
- */
- txg_wait_synced(dd->dd_pool, 0);
-
- /*
- * If we managed to free all the objects in open
- * context, the user space accounting should be zero.
- */
- if (ds->ds_phys->ds_bp.blk_fill == 0 &&
- dmu_objset_userused_enabled(os)) {
- ASSERTV(uint64_t count);
-
- ASSERT(zap_count(os, DMU_USERUSED_OBJECT,
- &count) != 0 || count == 0);
- ASSERT(zap_count(os, DMU_GROUPUSED_OBJECT,
- &count) != 0 || count == 0);
- }
- }
-
- rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER);
- err = dsl_dir_open_obj(dd->dd_pool, dd->dd_object, NULL, FTAG, &dd);
- rw_exit(&dd->dd_pool->dp_config_rwlock);
-
- if (err)
- goto out_free;
-
- /*
- * Blow away the dsl_dir + head dataset.
- */
- dsl_dataset_make_exclusive(ds, tag);
- /*
- * If we're removing a clone, we might also need to remove its
- * origin.
- */
- do {
- dsda.need_prep = B_FALSE;
- if (dsl_dir_is_clone(dd)) {
- err = dsl_dataset_origin_rm_prep(&dsda, tag);
- if (err) {
- dsl_dir_close(dd, FTAG);
- goto out_free;
- }
- }
-
- dstg = dsl_sync_task_group_create(ds->ds_dir->dd_pool);
- dsl_sync_task_create(dstg, dsl_dataset_destroy_check,
- dsl_dataset_destroy_sync, &dsda, tag, 0);
- dsl_sync_task_create(dstg, dsl_dir_destroy_check,
- dsl_dir_destroy_sync, dummy_ds, FTAG, 0);
- err = dsl_sync_task_group_wait(dstg);
- dsl_sync_task_group_destroy(dstg);
-
- /*
- * We could be racing against 'zfs release' or 'zfs destroy -d'
- * on the origin snap, in which case we can get EBUSY if we
- * needed to destroy the origin snap but were not ready to
- * do so.
- */
- if (dsda.need_prep) {
- ASSERT(err == EBUSY);
- ASSERT(dsl_dir_is_clone(dd));
- ASSERT(dsda.rm_origin == NULL);
- }
- } while (dsda.need_prep);
-
- if (dsda.rm_origin != NULL)
- dsl_dataset_disown(dsda.rm_origin, tag);
-
- /* if it is successful, dsl_dir_destroy_sync will close the dd */
- if (err)
- dsl_dir_close(dd, FTAG);
-
-out_free:
- kmem_free(dummy_ds, sizeof (dsl_dataset_t));
-out:
- dsl_dataset_disown(ds, tag);
- return (err);
-}
-
-blkptr_t *
-dsl_dataset_get_blkptr(dsl_dataset_t *ds)
-{
- return (&ds->ds_phys->ds_bp);
-}
-
-void
-dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx)
-{
- ASSERT(dmu_tx_is_syncing(tx));
- /* If it's the meta-objset, set dp_meta_rootbp */
- if (ds == NULL) {
- tx->tx_pool->dp_meta_rootbp = *bp;
- } else {
- dmu_buf_will_dirty(ds->ds_dbuf, tx);
- ds->ds_phys->ds_bp = *bp;
- }
-}
-
-spa_t *
-dsl_dataset_get_spa(dsl_dataset_t *ds)
-{
- return (ds->ds_dir->dd_pool->dp_spa);
-}
-
-void
-dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx)
-{
- dsl_pool_t *dp;
-
- if (ds == NULL) /* this is the meta-objset */
- return;
+ if (ds == NULL) /* this is the meta-objset */
+ return;
ASSERT(ds->ds_objset != NULL);
dp = ds->ds_dir->dd_pool;
- if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg) == 0) {
+ if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) {
/* up the hold count until we can be written out */
dmu_buf_add_ref(ds->ds_dbuf, ds);
}
return (B_FALSE);
}
-/*
- * The unique space in the head dataset can be calculated by subtracting
- * the space used in the most recent snapshot, that is still being used
- * in this file system, from the space currently in use. To figure out
- * the space in the most recent snapshot still in use, we need to take
- * the total space used in the snapshot and subtract out the space that
- * has been freed up since the snapshot was taken.
- */
-static void
-dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds)
-{
- uint64_t mrs_used;
- uint64_t dlused, dlcomp, dluncomp;
-
- ASSERT(!dsl_dataset_is_snapshot(ds));
-
- if (ds->ds_phys->ds_prev_snap_obj != 0)
- mrs_used = ds->ds_prev->ds_phys->ds_referenced_bytes;
- else
- mrs_used = 0;
-
- dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp);
-
- ASSERT3U(dlused, <=, mrs_used);
- ds->ds_phys->ds_unique_bytes =
- ds->ds_phys->ds_referenced_bytes - (mrs_used - dlused);
-
- if (spa_version(ds->ds_dir->dd_pool->dp_spa) >=
- SPA_VERSION_UNIQUE_ACCURATE)
- ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
-}
-
-struct killarg {
- dsl_dataset_t *ds;
- dmu_tx_t *tx;
-};
-
-/* ARGSUSED */
static int
-kill_blkptr(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
- const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
+dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx)
{
- struct killarg *ka = arg;
- dmu_tx_t *tx = ka->tx;
+ uint64_t asize;
- if (bp == NULL)
+ if (!dmu_tx_is_syncing(tx))
return (0);
- if (zb->zb_level == ZB_ZIL_LEVEL) {
- ASSERT(zilog != NULL);
- /*
- * It's a block in the intent log. It has no
- * accounting, so just free it.
- */
- dsl_free(ka->tx->tx_pool, ka->tx->tx_txg, bp);
- } else {
- ASSERT(zilog == NULL);
- ASSERT3U(bp->blk_birth, >, ka->ds->ds_phys->ds_prev_snap_txg);
- (void) dsl_dataset_block_kill(ka->ds, bp, tx, B_FALSE);
- }
-
- return (0);
-}
-
-/* ARGSUSED */
-static int
-dsl_dataset_destroy_begin_check(void *arg1, void *arg2, dmu_tx_t *tx)
-{
- dsl_dataset_t *ds = arg1;
- objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
- uint64_t count;
- int err;
-
/*
- * Can't delete a head dataset if there are snapshots of it.
- * (Except if the only snapshots are from the branch we cloned
- * from.)
+ * If there's an fs-only reservation, any blocks that might become
+ * owned by the snapshot dataset must be accommodated by space
+ * outside of the reservation.
*/
- if (ds->ds_prev != NULL &&
- ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object)
- return (EBUSY);
+ ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds));
+ asize = MIN(ds->ds_phys->ds_unique_bytes, ds->ds_reserved);
+ if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE))
+ return (SET_ERROR(ENOSPC));
/*
- * This is really a dsl_dir thing, but check it here so that
- * we'll be less likely to leave this dataset inconsistent &
- * nearly destroyed.
+ * Propagate any reserved space for this snapshot to other
+ * snapshot checks in this sync group.
*/
- err = zap_count(mos, ds->ds_dir->dd_phys->dd_child_dir_zapobj, &count);
- if (err)
- return (err);
- if (count != 0)
- return (EEXIST);
+ if (asize > 0)
+ dsl_dir_willuse_space(ds->ds_dir, asize, tx);
return (0);
}
-/* ARGSUSED */
-static void
-dsl_dataset_destroy_begin_sync(void *arg1, void *arg2, dmu_tx_t *tx)
-{
- dsl_dataset_t *ds = arg1;
- dsl_pool_t *dp = ds->ds_dir->dd_pool;
-
- /* Mark it as inconsistent on-disk, in case we crash */
- dmu_buf_will_dirty(ds->ds_dbuf, tx);
- ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT;
-
- spa_history_log_internal(LOG_DS_DESTROY_BEGIN, dp->dp_spa, tx,
- "dataset = %llu", ds->ds_object);
-}
-
-static int
-dsl_dataset_origin_check(struct dsl_ds_destroyarg *dsda, void *tag,
- dmu_tx_t *tx)
-{
- dsl_dataset_t *ds = dsda->ds;
- dsl_dataset_t *ds_prev = ds->ds_prev;
-
- if (dsl_dataset_might_destroy_origin(ds_prev)) {
- struct dsl_ds_destroyarg ndsda = {0};
-
- /*
- * If we're not prepared to remove the origin, don't remove
- * the clone either.
- */
- if (dsda->rm_origin == NULL) {
- dsda->need_prep = B_TRUE;
- return (EBUSY);
- }
-
- ndsda.ds = ds_prev;
- ndsda.is_origin_rm = B_TRUE;
- return (dsl_dataset_destroy_check(&ndsda, tag, tx));
- }
-
- /*
- * If we're not going to remove the origin after all,
- * undo the open context setup.
- */
- if (dsda->rm_origin != NULL) {
- dsl_dataset_disown(dsda->rm_origin, tag);
- dsda->rm_origin = NULL;
- }
-
- return (0);
-}
+typedef struct dsl_dataset_snapshot_arg {
+ nvlist_t *ddsa_snaps;
+ nvlist_t *ddsa_props;
+ nvlist_t *ddsa_errors;
+} dsl_dataset_snapshot_arg_t;
-/*
- * If you add new checks here, you may need to add
- * additional checks to the "temporary" case in
- * snapshot_check() in dmu_objset.c.
- */
-/* ARGSUSED */
int
-dsl_dataset_destroy_check(void *arg1, void *arg2, dmu_tx_t *tx)
+dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
+ dmu_tx_t *tx, boolean_t recv)
{
- struct dsl_ds_destroyarg *dsda = arg1;
- dsl_dataset_t *ds = dsda->ds;
+ int error;
+ uint64_t value;
- /* we have an owner hold, so noone else can destroy us */
- ASSERT(!DSL_DATASET_IS_DESTROYED(ds));
+ ds->ds_trysnap_txg = tx->tx_txg;
- /*
- * Only allow deferred destroy on pools that support it.
- * NOTE: deferred destroy is only supported on snapshots.
- */
- if (dsda->defer) {
- if (spa_version(ds->ds_dir->dd_pool->dp_spa) <
- SPA_VERSION_USERREFS)
- return (ENOTSUP);
- ASSERT(dsl_dataset_is_snapshot(ds));
+ if (!dmu_tx_is_syncing(tx))
return (0);
- }
/*
- * Can't delete a head dataset if there are snapshots of it.
- * (Except if the only snapshots are from the branch we cloned
- * from.)
+ * We don't allow multiple snapshots of the same txg. If there
+ * is already one, try again.
*/
- if (ds->ds_prev != NULL &&
- ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object)
- return (EBUSY);
+ if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg)
+ return (SET_ERROR(EAGAIN));
/*
- * If we made changes this txg, traverse_dsl_dataset won't find
- * them. Try again.
+ * Check for conflicting snapshot name.
*/
- if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg)
- return (EAGAIN);
+ error = dsl_dataset_snap_lookup(ds, snapname, &value);
+ if (error == 0)
+ return (SET_ERROR(EEXIST));
+ if (error != ENOENT)
+ return (error);
- if (dsl_dataset_is_snapshot(ds)) {
- /*
- * If this snapshot has an elevated user reference count,
- * we can't destroy it yet.
- */
- if (ds->ds_userrefs > 0 && !dsda->releasing)
- return (EBUSY);
+ /*
+ * We don't allow taking snapshots of inconsistent datasets, such as
+ * those into which we are currently receiving. However, if we are
+ * creating this snapshot as part of a receive, this check will be
+ * executed atomically with respect to the completion of the receive
+ * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
+ * case we ignore this, knowing it will be fixed up for us shortly in
+ * dmu_recv_end_sync().
+ */
+ if (!recv && DS_IS_INCONSISTENT(ds))
+ return (SET_ERROR(EBUSY));
- mutex_enter(&ds->ds_lock);
- /*
- * Can't delete a branch point. However, if we're destroying
- * a clone and removing its origin due to it having a user
- * hold count of 0 and having been marked for deferred destroy,
- * it's OK for the origin to have a single clone.
- */
- if (ds->ds_phys->ds_num_children >
- (dsda->is_origin_rm ? 2 : 1)) {
- mutex_exit(&ds->ds_lock);
- return (EEXIST);
- }
- mutex_exit(&ds->ds_lock);
- } else if (dsl_dir_is_clone(ds->ds_dir)) {
- return (dsl_dataset_origin_check(dsda, arg2, tx));
- }
+ error = dsl_dataset_snapshot_reserve_space(ds, tx);
+ if (error != 0)
+ return (error);
- /* XXX we should do some i/o error checking... */
return (0);
}
-struct refsarg {
- kmutex_t lock;
- boolean_t gone;
- kcondvar_t cv;
-};
-
-/* ARGSUSED */
-static void
-dsl_dataset_refs_gone(dmu_buf_t *db, void *argv)
+static int
+dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx)
{
- struct refsarg *arg = argv;
-
- mutex_enter(&arg->lock);
- arg->gone = TRUE;
- cv_signal(&arg->cv);
- mutex_exit(&arg->lock);
-}
+ dsl_dataset_snapshot_arg_t *ddsa = arg;
+ dsl_pool_t *dp = dmu_tx_pool(tx);
+ nvpair_t *pair;
+ int rv = 0;
-static void
-dsl_dataset_drain_refs(dsl_dataset_t *ds, void *tag)
-{
- struct refsarg arg;
+ for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
+ pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
+ int error = 0;
+ dsl_dataset_t *ds;
+ char *name, *atp;
+ char dsname[MAXNAMELEN];
+
+ name = nvpair_name(pair);
+ if (strlen(name) >= MAXNAMELEN)
+ error = SET_ERROR(ENAMETOOLONG);
+ if (error == 0) {
+ atp = strchr(name, '@');
+ if (atp == NULL)
+ error = SET_ERROR(EINVAL);
+ if (error == 0)
+ (void) strlcpy(dsname, name, atp - name + 1);
+ }
+ if (error == 0)
+ error = dsl_dataset_hold(dp, dsname, FTAG, &ds);
+ if (error == 0) {
+ error = dsl_dataset_snapshot_check_impl(ds,
+ atp + 1, tx, B_FALSE);
+ dsl_dataset_rele(ds, FTAG);
+ }
- mutex_init(&arg.lock, NULL, MUTEX_DEFAULT, NULL);
- cv_init(&arg.cv, NULL, CV_DEFAULT, NULL);
- arg.gone = FALSE;
- (void) dmu_buf_update_user(ds->ds_dbuf, ds, &arg, &ds->ds_phys,
- dsl_dataset_refs_gone);
- dmu_buf_rele(ds->ds_dbuf, tag);
- mutex_enter(&arg.lock);
- while (!arg.gone)
- cv_wait(&arg.cv, &arg.lock);
- ASSERT(arg.gone);
- mutex_exit(&arg.lock);
- ds->ds_dbuf = NULL;
- ds->ds_phys = NULL;
- mutex_destroy(&arg.lock);
- cv_destroy(&arg.cv);
+ if (error != 0) {
+ if (ddsa->ddsa_errors != NULL) {
+ fnvlist_add_int32(ddsa->ddsa_errors,
+ name, error);
+ }
+ rv = error;
+ }
+ }
+ return (rv);
}
-static void
-remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, dmu_tx_t *tx)
+void
+dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
+ dmu_tx_t *tx)
{
- objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
- int err;
- ASSERTV(uint64_t count);
+ dsl_pool_t *dp = ds->ds_dir->dd_pool;
+ dmu_buf_t *dbuf;
+ dsl_dataset_phys_t *dsphys;
+ uint64_t dsobj, crtxg;
+ objset_t *mos = dp->dp_meta_objset;
+ ASSERTV(static zil_header_t zero_zil);
+ ASSERTV(objset_t *os);
+
+ ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
- ASSERT(ds->ds_phys->ds_num_children >= 2);
- err = zap_remove_int(mos, ds->ds_phys->ds_next_clones_obj, obj, tx);
/*
- * The err should not be ENOENT, but a bug in a previous version
- * of the code could cause upgrade_clones_cb() to not set
- * ds_next_snap_obj when it should, leading to a missing entry.
- * If we knew that the pool was created after
- * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
- * ENOENT. However, at least we can check that we don't have
- * too many entries in the next_clones_obj even after failing to
- * remove this one.
+ * If we are on an old pool, the zil must not be active, in which
+ * case it will be zeroed. Usually zil_suspend() accomplishes this.
*/
- if (err != ENOENT) {
- VERIFY0(err);
- }
- ASSERT3U(0, ==, zap_count(mos, ds->ds_phys->ds_next_clones_obj,
- &count));
- ASSERT3U(count, <=, ds->ds_phys->ds_num_children - 2);
-}
+ ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP ||
+ dmu_objset_from_ds(ds, &os) != 0 ||
+ bcmp(&os->os_phys->os_zil_header, &zero_zil,
+ sizeof (zero_zil)) == 0);
-static void
-dsl_dataset_remove_clones_key(dsl_dataset_t *ds, uint64_t mintxg, dmu_tx_t *tx)
-{
- objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
- zap_cursor_t zc;
- zap_attribute_t za;
-
- /*
- * If it is the old version, dd_clones doesn't exist so we can't
- * find the clones, but deadlist_remove_key() is a no-op so it
- * doesn't matter.
- */
- if (ds->ds_dir->dd_phys->dd_clones == 0)
- return;
-
- for (zap_cursor_init(&zc, mos, ds->ds_dir->dd_phys->dd_clones);
- zap_cursor_retrieve(&zc, &za) == 0;
- zap_cursor_advance(&zc)) {
- dsl_dataset_t *clone;
-
- VERIFY3U(0, ==, dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
- za.za_first_integer, FTAG, &clone));
- if (clone->ds_dir->dd_origin_txg > mintxg) {
- dsl_deadlist_remove_key(&clone->ds_deadlist,
- mintxg, tx);
- dsl_dataset_remove_clones_key(clone, mintxg, tx);
- }
- dsl_dataset_rele(clone, FTAG);
- }
- zap_cursor_fini(&zc);
-}
-
-struct process_old_arg {
- dsl_dataset_t *ds;
- dsl_dataset_t *ds_prev;
- boolean_t after_branch_point;
- zio_t *pio;
- uint64_t used, comp, uncomp;
-};
-
-static int
-process_old_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
-{
- struct process_old_arg *poa = arg;
- dsl_pool_t *dp = poa->ds->ds_dir->dd_pool;
-
- if (bp->blk_birth <= poa->ds->ds_phys->ds_prev_snap_txg) {
- dsl_deadlist_insert(&poa->ds->ds_deadlist, bp, tx);
- if (poa->ds_prev && !poa->after_branch_point &&
- bp->blk_birth >
- poa->ds_prev->ds_phys->ds_prev_snap_txg) {
- poa->ds_prev->ds_phys->ds_unique_bytes +=
- bp_get_dsize_sync(dp->dp_spa, bp);
- }
- } else {
- poa->used += bp_get_dsize_sync(dp->dp_spa, bp);
- poa->comp += BP_GET_PSIZE(bp);
- poa->uncomp += BP_GET_UCSIZE(bp);
- dsl_free_sync(poa->pio, dp, tx->tx_txg, bp);
- }
- return (0);
-}
-
-static void
-process_old_deadlist(dsl_dataset_t *ds, dsl_dataset_t *ds_prev,
- dsl_dataset_t *ds_next, boolean_t after_branch_point, dmu_tx_t *tx)
-{
- struct process_old_arg poa = { 0 };
- dsl_pool_t *dp = ds->ds_dir->dd_pool;
- objset_t *mos = dp->dp_meta_objset;
-
- ASSERT(ds->ds_deadlist.dl_oldfmt);
- ASSERT(ds_next->ds_deadlist.dl_oldfmt);
-
- poa.ds = ds;
- poa.ds_prev = ds_prev;
- poa.after_branch_point = after_branch_point;
- poa.pio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
- VERIFY3U(0, ==, bpobj_iterate(&ds_next->ds_deadlist.dl_bpobj,
- process_old_cb, &poa, tx));
- VERIFY0(zio_wait(poa.pio));
- ASSERT3U(poa.used, ==, ds->ds_phys->ds_unique_bytes);
-
- /* change snapused */
- dsl_dir_diduse_space(ds->ds_dir, DD_USED_SNAP,
- -poa.used, -poa.comp, -poa.uncomp, tx);
-
- /* swap next's deadlist to our deadlist */
- dsl_deadlist_close(&ds->ds_deadlist);
- dsl_deadlist_close(&ds_next->ds_deadlist);
- SWITCH64(ds_next->ds_phys->ds_deadlist_obj,
- ds->ds_phys->ds_deadlist_obj);
- dsl_deadlist_open(&ds->ds_deadlist, mos, ds->ds_phys->ds_deadlist_obj);
- dsl_deadlist_open(&ds_next->ds_deadlist, mos,
- ds_next->ds_phys->ds_deadlist_obj);
-}
-
-static int
-old_synchronous_dataset_destroy(dsl_dataset_t *ds, dmu_tx_t *tx)
-{
- int err;
- struct killarg ka;
-
- /*
- * Free everything that we point to (that's born after
- * the previous snapshot, if we are a clone)
- *
- * NB: this should be very quick, because we already
- * freed all the objects in open context.
- */
- ka.ds = ds;
- ka.tx = tx;
- err = traverse_dataset(ds,
- ds->ds_phys->ds_prev_snap_txg, TRAVERSE_POST,
- kill_blkptr, &ka);
- ASSERT0(err);
- ASSERT(!DS_UNIQUE_IS_ACCURATE(ds) || ds->ds_phys->ds_unique_bytes == 0);
-
- return (err);
-}
-
-void
-dsl_dataset_destroy_sync(void *arg1, void *tag, dmu_tx_t *tx)
-{
- struct dsl_ds_destroyarg *dsda = arg1;
- dsl_dataset_t *ds = dsda->ds;
- int err = 0;
- int after_branch_point = FALSE;
- dsl_pool_t *dp = ds->ds_dir->dd_pool;
- objset_t *mos = dp->dp_meta_objset;
- dsl_dataset_t *ds_prev = NULL;
- boolean_t wont_destroy;
- uint64_t obj;
-
- wont_destroy = (dsda->defer &&
- (ds->ds_userrefs > 0 || ds->ds_phys->ds_num_children > 1));
-
- ASSERT(ds->ds_owner || wont_destroy);
- ASSERT(dsda->defer || ds->ds_phys->ds_num_children <= 1);
- ASSERT(ds->ds_prev == NULL ||
- ds->ds_prev->ds_phys->ds_next_snap_obj != ds->ds_object);
- ASSERT3U(ds->ds_phys->ds_bp.blk_birth, <=, tx->tx_txg);
-
- if (wont_destroy) {
- ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS);
- dmu_buf_will_dirty(ds->ds_dbuf, tx);
- ds->ds_phys->ds_flags |= DS_FLAG_DEFER_DESTROY;
- return;
- }
-
- /* signal any waiters that this dataset is going away */
- mutex_enter(&ds->ds_lock);
- ds->ds_owner = dsl_reaper;
- cv_broadcast(&ds->ds_exclusive_cv);
- mutex_exit(&ds->ds_lock);
-
- /* Remove our reservation */
- if (ds->ds_reserved != 0) {
- dsl_prop_setarg_t psa;
- uint64_t value = 0;
-
- dsl_prop_setarg_init_uint64(&psa, "refreservation",
- (ZPROP_SRC_NONE | ZPROP_SRC_LOCAL | ZPROP_SRC_RECEIVED),
- &value);
- psa.psa_effective_value = 0; /* predict default value */
-
- dsl_dataset_set_reservation_sync(ds, &psa, tx);
- ASSERT0(ds->ds_reserved);
- }
-
- ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock));
-
- dsl_scan_ds_destroyed(ds, tx);
-
- obj = ds->ds_object;
-
- if (ds->ds_phys->ds_prev_snap_obj != 0) {
- if (ds->ds_prev) {
- ds_prev = ds->ds_prev;
- } else {
- VERIFY(0 == dsl_dataset_hold_obj(dp,
- ds->ds_phys->ds_prev_snap_obj, FTAG, &ds_prev));
- }
- after_branch_point =
- (ds_prev->ds_phys->ds_next_snap_obj != obj);
-
- dmu_buf_will_dirty(ds_prev->ds_dbuf, tx);
- if (after_branch_point &&
- ds_prev->ds_phys->ds_next_clones_obj != 0) {
- remove_from_next_clones(ds_prev, obj, tx);
- if (ds->ds_phys->ds_next_snap_obj != 0) {
- VERIFY(0 == zap_add_int(mos,
- ds_prev->ds_phys->ds_next_clones_obj,
- ds->ds_phys->ds_next_snap_obj, tx));
- }
- }
- if (after_branch_point &&
- ds->ds_phys->ds_next_snap_obj == 0) {
- /* This clone is toast. */
- ASSERT(ds_prev->ds_phys->ds_num_children > 1);
- ds_prev->ds_phys->ds_num_children--;
-
- /*
- * If the clone's origin has no other clones, no
- * user holds, and has been marked for deferred
- * deletion, then we should have done the necessary
- * destroy setup for it.
- */
- if (ds_prev->ds_phys->ds_num_children == 1 &&
- ds_prev->ds_userrefs == 0 &&
- DS_IS_DEFER_DESTROY(ds_prev)) {
- ASSERT3P(dsda->rm_origin, !=, NULL);
- } else {
- ASSERT3P(dsda->rm_origin, ==, NULL);
- }
- } else if (!after_branch_point) {
- ds_prev->ds_phys->ds_next_snap_obj =
- ds->ds_phys->ds_next_snap_obj;
- }
- }
-
- if (dsl_dataset_is_snapshot(ds)) {
- dsl_dataset_t *ds_next;
- uint64_t old_unique;
- uint64_t used = 0, comp = 0, uncomp = 0;
-
- VERIFY(0 == dsl_dataset_hold_obj(dp,
- ds->ds_phys->ds_next_snap_obj, FTAG, &ds_next));
- ASSERT3U(ds_next->ds_phys->ds_prev_snap_obj, ==, obj);
-
- old_unique = ds_next->ds_phys->ds_unique_bytes;
-
- dmu_buf_will_dirty(ds_next->ds_dbuf, tx);
- ds_next->ds_phys->ds_prev_snap_obj =
- ds->ds_phys->ds_prev_snap_obj;
- ds_next->ds_phys->ds_prev_snap_txg =
- ds->ds_phys->ds_prev_snap_txg;
- ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==,
- ds_prev ? ds_prev->ds_phys->ds_creation_txg : 0);
-
-
- if (ds_next->ds_deadlist.dl_oldfmt) {
- process_old_deadlist(ds, ds_prev, ds_next,
- after_branch_point, tx);
- } else {
- /* Adjust prev's unique space. */
- if (ds_prev && !after_branch_point) {
- dsl_deadlist_space_range(&ds_next->ds_deadlist,
- ds_prev->ds_phys->ds_prev_snap_txg,
- ds->ds_phys->ds_prev_snap_txg,
- &used, &comp, &uncomp);
- ds_prev->ds_phys->ds_unique_bytes += used;
- }
-
- /* Adjust snapused. */
- dsl_deadlist_space_range(&ds_next->ds_deadlist,
- ds->ds_phys->ds_prev_snap_txg, UINT64_MAX,
- &used, &comp, &uncomp);
- dsl_dir_diduse_space(ds->ds_dir, DD_USED_SNAP,
- -used, -comp, -uncomp, tx);
-
- /* Move blocks to be freed to pool's free list. */
- dsl_deadlist_move_bpobj(&ds_next->ds_deadlist,
- &dp->dp_free_bpobj, ds->ds_phys->ds_prev_snap_txg,
- tx);
- dsl_dir_diduse_space(tx->tx_pool->dp_free_dir,
- DD_USED_HEAD, used, comp, uncomp, tx);
-
- /* Merge our deadlist into next's and free it. */
- dsl_deadlist_merge(&ds_next->ds_deadlist,
- ds->ds_phys->ds_deadlist_obj, tx);
- }
- dsl_deadlist_close(&ds->ds_deadlist);
- dsl_deadlist_free(mos, ds->ds_phys->ds_deadlist_obj, tx);
-
- /* Collapse range in clone heads */
- dsl_dataset_remove_clones_key(ds,
- ds->ds_phys->ds_creation_txg, tx);
-
- if (dsl_dataset_is_snapshot(ds_next)) {
- dsl_dataset_t *ds_nextnext;
- dsl_dataset_t *hds;
-
- /*
- * Update next's unique to include blocks which
- * were previously shared by only this snapshot
- * and it. Those blocks will be born after the
- * prev snap and before this snap, and will have
- * died after the next snap and before the one
- * after that (ie. be on the snap after next's
- * deadlist).
- */
- VERIFY(0 == dsl_dataset_hold_obj(dp,
- ds_next->ds_phys->ds_next_snap_obj,
- FTAG, &ds_nextnext));
- dsl_deadlist_space_range(&ds_nextnext->ds_deadlist,
- ds->ds_phys->ds_prev_snap_txg,
- ds->ds_phys->ds_creation_txg,
- &used, &comp, &uncomp);
- ds_next->ds_phys->ds_unique_bytes += used;
- dsl_dataset_rele(ds_nextnext, FTAG);
- ASSERT3P(ds_next->ds_prev, ==, NULL);
-
- /* Collapse range in this head. */
- VERIFY3U(0, ==, dsl_dataset_hold_obj(dp,
- ds->ds_dir->dd_phys->dd_head_dataset_obj,
- FTAG, &hds));
- dsl_deadlist_remove_key(&hds->ds_deadlist,
- ds->ds_phys->ds_creation_txg, tx);
- dsl_dataset_rele(hds, FTAG);
-
- } else {
- ASSERT3P(ds_next->ds_prev, ==, ds);
- dsl_dataset_drop_ref(ds_next->ds_prev, ds_next);
- ds_next->ds_prev = NULL;
- if (ds_prev) {
- VERIFY(0 == dsl_dataset_get_ref(dp,
- ds->ds_phys->ds_prev_snap_obj,
- ds_next, &ds_next->ds_prev));
- }
-
- dsl_dataset_recalc_head_uniq(ds_next);
-
- /*
- * Reduce the amount of our unconsmed refreservation
- * being charged to our parent by the amount of
- * new unique data we have gained.
- */
- if (old_unique < ds_next->ds_reserved) {
- int64_t mrsdelta;
- uint64_t new_unique =
- ds_next->ds_phys->ds_unique_bytes;
-
- ASSERT(old_unique <= new_unique);
- mrsdelta = MIN(new_unique - old_unique,
- ds_next->ds_reserved - old_unique);
- dsl_dir_diduse_space(ds->ds_dir,
- DD_USED_REFRSRV, -mrsdelta, 0, 0, tx);
- }
- }
- dsl_dataset_rele(ds_next, FTAG);
- } else {
- zfeature_info_t *async_destroy =
- &spa_feature_table[SPA_FEATURE_ASYNC_DESTROY];
- objset_t *os;
-
- /*
- * There's no next snapshot, so this is a head dataset.
- * Destroy the deadlist. Unless it's a clone, the
- * deadlist should be empty. (If it's a clone, it's
- * safe to ignore the deadlist contents.)
- */
- dsl_deadlist_close(&ds->ds_deadlist);
- dsl_deadlist_free(mos, ds->ds_phys->ds_deadlist_obj, tx);
- ds->ds_phys->ds_deadlist_obj = 0;
-
- VERIFY3U(0, ==, dmu_objset_from_ds(ds, &os));
-
- if (!spa_feature_is_enabled(dp->dp_spa, async_destroy)) {
- err = old_synchronous_dataset_destroy(ds, tx);
- } else {
- /*
- * Move the bptree into the pool's list of trees to
- * clean up and update space accounting information.
- */
- uint64_t used, comp, uncomp;
-
- zil_destroy_sync(dmu_objset_zil(os), tx);
-
- if (!spa_feature_is_active(dp->dp_spa, async_destroy)) {
- spa_feature_incr(dp->dp_spa, async_destroy, tx);
- dp->dp_bptree_obj = bptree_alloc(mos, tx);
- VERIFY(zap_add(mos,
- DMU_POOL_DIRECTORY_OBJECT,
- DMU_POOL_BPTREE_OBJ, sizeof (uint64_t), 1,
- &dp->dp_bptree_obj, tx) == 0);
- }
-
- used = ds->ds_dir->dd_phys->dd_used_bytes;
- comp = ds->ds_dir->dd_phys->dd_compressed_bytes;
- uncomp = ds->ds_dir->dd_phys->dd_uncompressed_bytes;
-
- ASSERT(!DS_UNIQUE_IS_ACCURATE(ds) ||
- ds->ds_phys->ds_unique_bytes == used);
-
- bptree_add(mos, dp->dp_bptree_obj,
- &ds->ds_phys->ds_bp, ds->ds_phys->ds_prev_snap_txg,
- used, comp, uncomp, tx);
- dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD,
- -used, -comp, -uncomp, tx);
- dsl_dir_diduse_space(dp->dp_free_dir, DD_USED_HEAD,
- used, comp, uncomp, tx);
- }
-
- if (ds->ds_prev != NULL) {
- if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
- VERIFY3U(0, ==, zap_remove_int(mos,
- ds->ds_prev->ds_dir->dd_phys->dd_clones,
- ds->ds_object, tx));
- }
- dsl_dataset_rele(ds->ds_prev, ds);
- ds->ds_prev = ds_prev = NULL;
- }
- }
-
- /*
- * This must be done after the dsl_traverse(), because it will
- * re-open the objset.
- */
- if (ds->ds_objset) {
- dmu_objset_evict(ds->ds_objset);
- ds->ds_objset = NULL;
- }
-
- if (ds->ds_dir->dd_phys->dd_head_dataset_obj == ds->ds_object) {
- /* Erase the link in the dir */
- dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx);
- ds->ds_dir->dd_phys->dd_head_dataset_obj = 0;
- ASSERT(ds->ds_phys->ds_snapnames_zapobj != 0);
- err = zap_destroy(mos, ds->ds_phys->ds_snapnames_zapobj, tx);
- ASSERT(err == 0);
- } else {
- /* remove from snapshot namespace */
- dsl_dataset_t *ds_head;
- ASSERT(ds->ds_phys->ds_snapnames_zapobj == 0);
- VERIFY(0 == dsl_dataset_hold_obj(dp,
- ds->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &ds_head));
- VERIFY(0 == dsl_dataset_get_snapname(ds));
-#ifdef ZFS_DEBUG
- {
- uint64_t val;
-
- err = dsl_dataset_snap_lookup(ds_head,
- ds->ds_snapname, &val);
- ASSERT0(err);
- ASSERT3U(val, ==, obj);
- }
-#endif
- err = dsl_dataset_snap_remove(ds_head, ds->ds_snapname, tx);
- ASSERT(err == 0);
- dsl_dataset_rele(ds_head, FTAG);
- }
-
- if (ds_prev && ds->ds_prev != ds_prev)
- dsl_dataset_rele(ds_prev, FTAG);
-
- spa_prop_clear_bootfs(dp->dp_spa, ds->ds_object, tx);
- spa_history_log_internal(LOG_DS_DESTROY, dp->dp_spa, tx,
- "dataset = %llu", ds->ds_object);
-
- if (ds->ds_phys->ds_next_clones_obj != 0) {
- ASSERTV(uint64_t count);
- ASSERT(0 == zap_count(mos,
- ds->ds_phys->ds_next_clones_obj, &count) && count == 0);
- VERIFY(0 == dmu_object_free(mos,
- ds->ds_phys->ds_next_clones_obj, tx));
- }
- if (ds->ds_phys->ds_props_obj != 0)
- VERIFY(0 == zap_destroy(mos, ds->ds_phys->ds_props_obj, tx));
- if (ds->ds_phys->ds_userrefs_obj != 0)
- VERIFY(0 == zap_destroy(mos, ds->ds_phys->ds_userrefs_obj, tx));
- dsl_dir_close(ds->ds_dir, ds);
- ds->ds_dir = NULL;
- dsl_dataset_drain_refs(ds, tag);
- VERIFY(0 == dmu_object_free(mos, obj, tx));
-
- if (dsda->rm_origin) {
- /*
- * Remove the origin of the clone we just destroyed.
- */
- struct dsl_ds_destroyarg ndsda = {0};
-
- ndsda.ds = dsda->rm_origin;
- dsl_dataset_destroy_sync(&ndsda, tag, tx);
- }
-}
-
-static int
-dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx)
-{
- uint64_t asize;
-
- if (!dmu_tx_is_syncing(tx))
- return (0);
-
- /*
- * If there's an fs-only reservation, any blocks that might become
- * owned by the snapshot dataset must be accommodated by space
- * outside of the reservation.
- */
- ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds));
- asize = MIN(ds->ds_phys->ds_unique_bytes, ds->ds_reserved);
- if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE))
- return (ENOSPC);
-
- /*
- * Propogate any reserved space for this snapshot to other
- * snapshot checks in this sync group.
- */
- if (asize > 0)
- dsl_dir_willuse_space(ds->ds_dir, asize, tx);
-
- return (0);
-}
-
-int
-dsl_dataset_snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx)
-{
- dsl_dataset_t *ds = arg1;
- const char *snapname = arg2;
- int err;
- uint64_t value;
-
- /*
- * We don't allow multiple snapshots of the same txg. If there
- * is already one, try again.
- */
- if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg)
- return (EAGAIN);
-
- /*
- * Check for conflicting name snapshot name.
- */
- err = dsl_dataset_snap_lookup(ds, snapname, &value);
- if (err == 0)
- return (EEXIST);
- if (err != ENOENT)
- return (err);
-
- /*
- * Check that the dataset's name is not too long. Name consists
- * of the dataset's length + 1 for the @-sign + snapshot name's length
- */
- if (dsl_dataset_namelen(ds) + 1 + strlen(snapname) >= MAXNAMELEN)
- return (ENAMETOOLONG);
-
- err = dsl_dataset_snapshot_reserve_space(ds, tx);
- if (err)
- return (err);
-
- ds->ds_trysnap_txg = tx->tx_txg;
- return (0);
-}
-
-void
-dsl_dataset_snapshot_sync(void *arg1, void *arg2, dmu_tx_t *tx)
-{
- dsl_dataset_t *ds = arg1;
- const char *snapname = arg2;
- dsl_pool_t *dp = ds->ds_dir->dd_pool;
- dmu_buf_t *dbuf;
- dsl_dataset_phys_t *dsphys;
- uint64_t dsobj, crtxg;
- objset_t *mos = dp->dp_meta_objset;
- int err;
-
- ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock));
/*
* The origin's ds_creation_txg has to be < TXG_INITIAL
dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
- VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
+ VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
dmu_buf_will_dirty(dbuf, tx);
dsphys = dbuf->db_data;
bzero(dsphys, sizeof (dsl_dataset_phys_t));
ds->ds_prev->ds_phys->ds_creation_txg);
ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj;
} else if (next_clones_obj != 0) {
- remove_from_next_clones(ds->ds_prev,
+ dsl_dataset_remove_from_next_clones(ds->ds_prev,
dsphys->ds_next_snap_obj, tx);
- VERIFY3U(0, ==, zap_add_int(mos,
+ VERIFY0(zap_add_int(mos,
next_clones_obj, dsobj, tx));
}
}
}
dmu_buf_will_dirty(ds->ds_dbuf, tx);
- zfs_dbgmsg("taking snapshot %s@%s/%llu; newkey=%llu",
- ds->ds_dir->dd_myname, snapname, dsobj,
- ds->ds_phys->ds_prev_snap_txg);
ds->ds_phys->ds_deadlist_obj = dsl_deadlist_clone(&ds->ds_deadlist,
UINT64_MAX, ds->ds_phys->ds_prev_snap_obj, tx);
dsl_deadlist_close(&ds->ds_deadlist);
if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
- err = zap_add(mos, ds->ds_phys->ds_snapnames_zapobj,
- snapname, 8, 1, &dsobj, tx);
- ASSERT(err == 0);
+ VERIFY0(zap_add(mos, ds->ds_phys->ds_snapnames_zapobj,
+ snapname, 8, 1, &dsobj, tx));
if (ds->ds_prev)
- dsl_dataset_drop_ref(ds->ds_prev, ds);
- VERIFY(0 == dsl_dataset_get_ref(dp,
+ dsl_dataset_rele(ds->ds_prev, ds);
+ VERIFY0(dsl_dataset_hold_obj(dp,
ds->ds_phys->ds_prev_snap_obj, ds, &ds->ds_prev));
dsl_scan_ds_snapshotted(ds, tx);
dsl_dir_snap_cmtime_update(ds->ds_dir);
- spa_history_log_internal(LOG_DS_SNAPSHOT, dp->dp_spa, tx,
- "dataset = %llu", dsobj);
+ spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, "");
}
-void
-dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx)
+static void
+dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx)
{
- ASSERT(dmu_tx_is_syncing(tx));
- ASSERT(ds->ds_objset != NULL);
- ASSERT(ds->ds_phys->ds_next_snap_obj == 0);
-
- /*
- * in case we had to change ds_fsid_guid when we opened it,
- * sync it out now.
- */
- dmu_buf_will_dirty(ds->ds_dbuf, tx);
- ds->ds_phys->ds_fsid_guid = ds->ds_fsid_guid;
+ dsl_dataset_snapshot_arg_t *ddsa = arg;
+ dsl_pool_t *dp = dmu_tx_pool(tx);
+ nvpair_t *pair;
- dmu_objset_sync(ds->ds_objset, zio, tx);
+ for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
+ pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
+ dsl_dataset_t *ds;
+ char *name, *atp;
+ char dsname[MAXNAMELEN];
+
+ name = nvpair_name(pair);
+ atp = strchr(name, '@');
+ (void) strlcpy(dsname, name, atp - name + 1);
+ VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds));
+
+ dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx);
+ if (ddsa->ddsa_props != NULL) {
+ dsl_props_set_sync_impl(ds->ds_prev,
+ ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx);
+ }
+ dsl_dataset_rele(ds, FTAG);
+ }
}
-static void
-get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv)
+/*
+ * The snapshots must all be in the same pool.
+ * All-or-nothing: if there are any failures, nothing will be modified.
+ */
+int
+dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors)
{
- uint64_t count = 0;
- objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
- zap_cursor_t zc;
- zap_attribute_t za;
- nvlist_t *propval;
- nvlist_t *val;
+ dsl_dataset_snapshot_arg_t ddsa;
+ nvpair_t *pair;
+ boolean_t needsuspend;
+ int error;
+ spa_t *spa;
+ char *firstname;
+ nvlist_t *suspended = NULL;
- rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER);
- VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
- VERIFY(nvlist_alloc(&val, NV_UNIQUE_NAME, KM_SLEEP) == 0);
+ pair = nvlist_next_nvpair(snaps, NULL);
+ if (pair == NULL)
+ return (0);
+ firstname = nvpair_name(pair);
+
+ error = spa_open(firstname, &spa, FTAG);
+ if (error != 0)
+ return (error);
+ needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
+ spa_close(spa, FTAG);
+
+ if (needsuspend) {
+ suspended = fnvlist_alloc();
+ for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
+ pair = nvlist_next_nvpair(snaps, pair)) {
+ char fsname[MAXNAMELEN];
+ char *snapname = nvpair_name(pair);
+ char *atp;
+ void *cookie;
+
+ atp = strchr(snapname, '@');
+ if (atp == NULL) {
+ error = SET_ERROR(EINVAL);
+ break;
+ }
+ (void) strlcpy(fsname, snapname, atp - snapname + 1);
+
+ error = zil_suspend(fsname, &cookie);
+ if (error != 0)
+ break;
+ fnvlist_add_uint64(suspended, fsname,
+ (uintptr_t)cookie);
+ }
+ }
+
+ ddsa.ddsa_snaps = snaps;
+ ddsa.ddsa_props = props;
+ ddsa.ddsa_errors = errors;
+
+ if (error == 0) {
+ error = dsl_sync_task(firstname, dsl_dataset_snapshot_check,
+ dsl_dataset_snapshot_sync, &ddsa,
+ fnvlist_num_pairs(snaps) * 3);
+ }
+
+ if (suspended != NULL) {
+ for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL;
+ pair = nvlist_next_nvpair(suspended, pair)) {
+ zil_resume((void *)(uintptr_t)
+ fnvpair_value_uint64(pair));
+ }
+ fnvlist_free(suspended);
+ }
+
+#ifdef _KERNEL
+ if (error == 0) {
+ for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
+ pair = nvlist_next_nvpair(snaps, pair)) {
+ char *snapname = nvpair_name(pair);
+ zvol_create_minors(snapname);
+ }
+ }
+#endif
+
+ return (error);
+}
+
+typedef struct dsl_dataset_snapshot_tmp_arg {
+ const char *ddsta_fsname;
+ const char *ddsta_snapname;
+ minor_t ddsta_cleanup_minor;
+ const char *ddsta_htag;
+} dsl_dataset_snapshot_tmp_arg_t;
+
+static int
+dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx)
+{
+ dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
+ dsl_pool_t *dp = dmu_tx_pool(tx);
+ dsl_dataset_t *ds;
+ int error;
+
+ error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds);
+ if (error != 0)
+ return (error);
+
+ error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname,
+ tx, B_FALSE);
+ if (error != 0) {
+ dsl_dataset_rele(ds, FTAG);
+ return (error);
+ }
+
+ if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) {
+ dsl_dataset_rele(ds, FTAG);
+ return (SET_ERROR(ENOTSUP));
+ }
+ error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag,
+ B_TRUE, tx);
+ if (error != 0) {
+ dsl_dataset_rele(ds, FTAG);
+ return (error);
+ }
+
+ dsl_dataset_rele(ds, FTAG);
+ return (0);
+}
+
+static void
+dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx)
+{
+ dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
+ dsl_pool_t *dp = dmu_tx_pool(tx);
+ dsl_dataset_t *ds;
+
+ VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds));
+
+ dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx);
+ dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag,
+ ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx);
+ dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx);
+
+ dsl_dataset_rele(ds, FTAG);
+}
+
+int
+dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
+ minor_t cleanup_minor, const char *htag)
+{
+ dsl_dataset_snapshot_tmp_arg_t ddsta;
+ int error;
+ spa_t *spa;
+ boolean_t needsuspend;
+ void *cookie;
+
+ ddsta.ddsta_fsname = fsname;
+ ddsta.ddsta_snapname = snapname;
+ ddsta.ddsta_cleanup_minor = cleanup_minor;
+ ddsta.ddsta_htag = htag;
+
+ error = spa_open(fsname, &spa, FTAG);
+ if (error != 0)
+ return (error);
+ needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
+ spa_close(spa, FTAG);
+
+ if (needsuspend) {
+ error = zil_suspend(fsname, &cookie);
+ if (error != 0)
+ return (error);
+ }
+
+ error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check,
+ dsl_dataset_snapshot_tmp_sync, &ddsta, 3);
+
+ if (needsuspend)
+ zil_resume(cookie);
+ return (error);
+}
+
+
+void
+dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx)
+{
+ ASSERT(dmu_tx_is_syncing(tx));
+ ASSERT(ds->ds_objset != NULL);
+ ASSERT(ds->ds_phys->ds_next_snap_obj == 0);
+
+ /*
+ * in case we had to change ds_fsid_guid when we opened it,
+ * sync it out now.
+ */
+ dmu_buf_will_dirty(ds->ds_dbuf, tx);
+ ds->ds_phys->ds_fsid_guid = ds->ds_fsid_guid;
+
+ dmu_objset_sync(ds->ds_objset, zio, tx);
+}
+
+static void
+get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv)
+{
+ uint64_t count = 0;
+ objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
+ zap_cursor_t zc;
+ zap_attribute_t za;
+ nvlist_t *propval = fnvlist_alloc();
+ nvlist_t *val = fnvlist_alloc();
+
+ ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
/*
- * There may me missing entries in ds_next_clones_obj
+ * There may be missing entries in ds_next_clones_obj
* due to a bug in a previous version of the code.
* Only trust it if it has the right number of entries.
*/
if (ds->ds_phys->ds_next_clones_obj != 0) {
- ASSERT3U(0, ==, zap_count(mos, ds->ds_phys->ds_next_clones_obj,
+ VERIFY0(zap_count(mos, ds->ds_phys->ds_next_clones_obj,
&count));
}
- if (count != ds->ds_phys->ds_num_children - 1) {
+ if (count != ds->ds_phys->ds_num_children - 1)
goto fail;
- }
for (zap_cursor_init(&zc, mos, ds->ds_phys->ds_next_clones_obj);
zap_cursor_retrieve(&zc, &za) == 0;
zap_cursor_advance(&zc)) {
dsl_dataset_t *clone;
char buf[ZFS_MAXNAMELEN];
- /*
- * Even though we hold the dp_config_rwlock, the dataset
- * may fail to open, returning ENOENT. If there is a
- * thread concurrently attempting to destroy this
- * dataset, it will have the ds_rwlock held for
- * RW_WRITER. Our call to dsl_dataset_hold_obj() ->
- * dsl_dataset_hold_ref() will fail its
- * rw_tryenter(&ds->ds_rwlock, RW_READER), drop the
- * dp_config_rwlock, and wait for the destroy progress
- * and signal ds_exclusive_cv. If the destroy was
- * successful, we will see that
- * DSL_DATASET_IS_DESTROYED(), and return ENOENT.
- */
- if (dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
- za.za_first_integer, FTAG, &clone) != 0)
- continue;
+ VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
+ za.za_first_integer, FTAG, &clone));
dsl_dir_name(clone->ds_dir, buf);
- VERIFY(nvlist_add_boolean(val, buf) == 0);
+ fnvlist_add_boolean(val, buf);
dsl_dataset_rele(clone, FTAG);
}
zap_cursor_fini(&zc);
- VERIFY(nvlist_add_nvlist(propval, ZPROP_VALUE, val) == 0);
- VERIFY(nvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES),
- propval) == 0);
+ fnvlist_add_nvlist(propval, ZPROP_VALUE, val);
+ fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval);
fail:
nvlist_free(val);
nvlist_free(propval);
- rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock);
}
void
dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv)
{
uint64_t refd, avail, uobjs, aobjs, ratio;
+ ASSERTV(dsl_pool_t *dp = ds->ds_dir->dd_pool);
+
+ ASSERT(dsl_pool_config_held(dp));
+
+ ratio = ds->ds_phys->ds_compressed_bytes == 0 ? 100 :
+ (ds->ds_phys->ds_uncompressed_bytes * 100 /
+ ds->ds_phys->ds_compressed_bytes);
+
+ dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio);
+ dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED,
+ ds->ds_phys->ds_uncompressed_bytes);
- dsl_dir_stats(ds->ds_dir, nv);
+ if (dsl_dataset_is_snapshot(ds)) {
+ dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio);
+ dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
+ ds->ds_phys->ds_unique_bytes);
+ get_clones_stat(ds, nv);
+ } else {
+ dsl_dir_stats(ds->ds_dir, nv);
+ }
dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail);
dsl_dataset_t *prev;
int err;
- rw_enter(&dp->dp_config_rwlock, RW_READER);
err = dsl_dataset_hold_obj(dp,
ds->ds_phys->ds_prev_snap_obj, FTAG, &prev);
- rw_exit(&dp->dp_config_rwlock);
if (err == 0) {
err = dsl_dataset_space_written(prev, ds, &written,
&comp, &uncomp);
}
}
- ratio = ds->ds_phys->ds_compressed_bytes == 0 ? 100 :
- (ds->ds_phys->ds_uncompressed_bytes * 100 /
- ds->ds_phys->ds_compressed_bytes);
- dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio);
-
- if (ds->ds_phys->ds_next_snap_obj) {
- /*
- * This is a snapshot; override the dd's space used with
- * our unique space and compression ratio.
- */
- dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
- ds->ds_phys->ds_unique_bytes);
- dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio);
-
- get_clones_stat(ds, nv);
- }
}
void
dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat)
{
+ dsl_pool_t *dp = ds->ds_dir->dd_pool;
+ ASSERT(dsl_pool_config_held(dp));
+
stat->dds_creation_txg = ds->ds_phys->ds_creation_txg;
stat->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT;
stat->dds_guid = ds->ds_phys->ds_guid;
- if (ds->ds_phys->ds_next_snap_obj) {
+ stat->dds_origin[0] = '\0';
+ if (dsl_dataset_is_snapshot(ds)) {
stat->dds_is_snapshot = B_TRUE;
stat->dds_num_clones = ds->ds_phys->ds_num_children - 1;
} else {
stat->dds_is_snapshot = B_FALSE;
stat->dds_num_clones = 0;
- }
- /* clone origin is really a dsl_dir thing... */
- rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER);
- if (dsl_dir_is_clone(ds->ds_dir)) {
- dsl_dataset_t *ods;
+ if (dsl_dir_is_clone(ds->ds_dir)) {
+ dsl_dataset_t *ods;
- VERIFY(0 == dsl_dataset_get_ref(ds->ds_dir->dd_pool,
- ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &ods));
- dsl_dataset_name(ods, stat->dds_origin);
- dsl_dataset_drop_ref(ods, FTAG);
- } else {
- stat->dds_origin[0] = '\0';
+ VERIFY0(dsl_dataset_hold_obj(dp,
+ ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &ods));
+ dsl_dataset_name(ods, stat->dds_origin);
+ dsl_dataset_rele(ods, FTAG);
+ }
}
- rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock);
}
uint64_t
else
*availbytesp = 0;
}
- *usedobjsp = ds->ds_phys->ds_bp.blk_fill;
+ *usedobjsp = BP_GET_FILL(&ds->ds_phys->ds_bp);
*availobjsp = DN_MAX_OBJECT - *usedobjsp;
}
boolean_t
-dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds)
+dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap)
{
- ASSERTV(dsl_pool_t *dp = ds->ds_dir->dd_pool);
-
- ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) ||
- dsl_pool_sync_context(dp));
- if (ds->ds_prev == NULL)
+ ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
+ if (snap == NULL)
return (B_FALSE);
if (ds->ds_phys->ds_bp.blk_birth >
- ds->ds_prev->ds_phys->ds_creation_txg) {
- objset_t *os, *os_prev;
+ snap->ds_phys->ds_creation_txg) {
+ objset_t *os, *os_snap;
/*
* It may be that only the ZIL differs, because it was
* reset in the head. Don't count that as being
*/
if (dmu_objset_from_ds(ds, &os) != 0)
return (B_TRUE);
- if (dmu_objset_from_ds(ds->ds_prev, &os_prev) != 0)
+ if (dmu_objset_from_ds(snap, &os_snap) != 0)
return (B_TRUE);
return (bcmp(&os->os_phys->os_meta_dnode,
- &os_prev->os_phys->os_meta_dnode,
+ &os_snap->os_phys->os_meta_dnode,
sizeof (os->os_phys->os_meta_dnode)) != 0);
}
return (B_FALSE);
}
+typedef struct dsl_dataset_rename_snapshot_arg {
+ const char *ddrsa_fsname;
+ const char *ddrsa_oldsnapname;
+ const char *ddrsa_newsnapname;
+ boolean_t ddrsa_recursive;
+ dmu_tx_t *ddrsa_tx;
+} dsl_dataset_rename_snapshot_arg_t;
+
/* ARGSUSED */
static int
-dsl_dataset_snapshot_rename_check(void *arg1, void *arg2, dmu_tx_t *tx)
+dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp,
+ dsl_dataset_t *hds, void *arg)
{
- dsl_dataset_t *ds = arg1;
- char *newsnapname = arg2;
- dsl_dir_t *dd = ds->ds_dir;
- dsl_dataset_t *hds;
+ dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
+ int error;
uint64_t val;
- int err;
-
- err = dsl_dataset_hold_obj(dd->dd_pool,
- dd->dd_phys->dd_head_dataset_obj, FTAG, &hds);
- if (err)
- return (err);
- /* new name better not be in use */
- err = dsl_dataset_snap_lookup(hds, newsnapname, &val);
- dsl_dataset_rele(hds, FTAG);
+ error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
+ if (error != 0) {
+ /* ignore nonexistent snapshots */
+ return (error == ENOENT ? 0 : error);
+ }
- if (err == 0)
- err = EEXIST;
- else if (err == ENOENT)
- err = 0;
+ /* new name should not exist */
+ error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val);
+ if (error == 0)
+ error = SET_ERROR(EEXIST);
+ else if (error == ENOENT)
+ error = 0;
/* dataset name + 1 for the "@" + the new snapshot name must fit */
- if (dsl_dir_namelen(ds->ds_dir) + 1 + strlen(newsnapname) >= MAXNAMELEN)
- err = ENAMETOOLONG;
+ if (dsl_dir_namelen(hds->ds_dir) + 1 +
+ strlen(ddrsa->ddrsa_newsnapname) >= MAXNAMELEN)
+ error = SET_ERROR(ENAMETOOLONG);
- return (err);
+ return (error);
}
-static void
-dsl_dataset_snapshot_rename_sync(void *arg1, void *arg2, dmu_tx_t *tx)
+static int
+dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx)
{
- dsl_dataset_t *ds = arg1;
- const char *newsnapname = arg2;
- dsl_dir_t *dd = ds->ds_dir;
- objset_t *mos = dd->dd_pool->dp_meta_objset;
+ dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
+ dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *hds;
- int err;
-
- ASSERT(ds->ds_phys->ds_next_snap_obj != 0);
-
- VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool,
- dd->dd_phys->dd_head_dataset_obj, FTAG, &hds));
+ int error;
- VERIFY(0 == dsl_dataset_get_snapname(ds));
- err = dsl_dataset_snap_remove(hds, ds->ds_snapname, tx);
- ASSERT0(err);
- mutex_enter(&ds->ds_lock);
- (void) strcpy(ds->ds_snapname, newsnapname);
- mutex_exit(&ds->ds_lock);
- err = zap_add(mos, hds->ds_phys->ds_snapnames_zapobj,
- ds->ds_snapname, 8, 1, &ds->ds_object, tx);
- ASSERT0(err);
+ error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds);
+ if (error != 0)
+ return (error);
- spa_history_log_internal(LOG_DS_RENAME, dd->dd_pool->dp_spa, tx,
- "dataset = %llu", ds->ds_object);
+ if (ddrsa->ddrsa_recursive) {
+ error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
+ dsl_dataset_rename_snapshot_check_impl, ddrsa,
+ DS_FIND_CHILDREN);
+ } else {
+ error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa);
+ }
dsl_dataset_rele(hds, FTAG);
+ return (error);
}
-struct renamesnaparg {
- dsl_sync_task_group_t *dstg;
- char failed[MAXPATHLEN];
- char *oldsnap;
- char *newsnap;
-};
-
static int
-dsl_snapshot_rename_one(const char *name, void *arg)
+dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp,
+ dsl_dataset_t *hds, void *arg)
{
- struct renamesnaparg *ra = arg;
- dsl_dataset_t *ds = NULL;
- char *snapname;
- int err;
-
- snapname = kmem_asprintf("%s@%s", name, ra->oldsnap);
- (void) strlcpy(ra->failed, snapname, sizeof (ra->failed));
+ dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
+ dsl_dataset_t *ds;
+ uint64_t val;
+ dmu_tx_t *tx = ddrsa->ddrsa_tx;
+ int error;
- /*
- * For recursive snapshot renames the parent won't be changing
- * so we just pass name for both the to/from argument.
- */
- err = zfs_secpolicy_rename_perms(snapname, snapname, CRED());
- if (err != 0) {
- strfree(snapname);
- return (err == ENOENT ? 0 : err);
+ error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
+ ASSERT(error == 0 || error == ENOENT);
+ if (error == ENOENT) {
+ /* ignore nonexistent snapshots */
+ return (0);
}
-#ifdef _KERNEL
- /*
- * For all filesystems undergoing rename, we'll need to unmount it.
- */
- (void) zfs_unmount_snap(snapname, NULL);
-#endif
- err = dsl_dataset_hold(snapname, ra->dstg, &ds);
- strfree(snapname);
- if (err != 0)
- return (err == ENOENT ? 0 : err);
+ VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds));
- dsl_sync_task_create(ra->dstg, dsl_dataset_snapshot_rename_check,
- dsl_dataset_snapshot_rename_sync, ds, ra->newsnap, 0);
+ /* log before we change the name */
+ spa_history_log_internal_ds(ds, "rename", tx,
+ "-> @%s", ddrsa->ddrsa_newsnapname);
+ VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx));
+ mutex_enter(&ds->ds_lock);
+ (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname);
+ mutex_exit(&ds->ds_lock);
+ VERIFY0(zap_add(dp->dp_meta_objset, hds->ds_phys->ds_snapnames_zapobj,
+ ds->ds_snapname, 8, 1, &ds->ds_object, tx));
+
+ dsl_dataset_rele(ds, FTAG);
return (0);
}
-static int
-dsl_recursive_rename(char *oldname, const char *newname)
+static void
+dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx)
{
- int err;
- struct renamesnaparg *ra;
- dsl_sync_task_t *dst;
- spa_t *spa;
- char *cp, *fsname = spa_strdup(oldname);
- int len = strlen(oldname) + 1;
-
- /* truncate the snapshot name to get the fsname */
- cp = strchr(fsname, '@');
- *cp = '\0';
+ dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
+ dsl_pool_t *dp = dmu_tx_pool(tx);
+ dsl_dataset_t *hds;
- err = spa_open(fsname, &spa, FTAG);
- if (err) {
- kmem_free(fsname, len);
- return (err);
+ VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds));
+ ddrsa->ddrsa_tx = tx;
+ if (ddrsa->ddrsa_recursive) {
+ VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
+ dsl_dataset_rename_snapshot_sync_impl, ddrsa,
+ DS_FIND_CHILDREN));
+ } else {
+ VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa));
}
- ra = kmem_alloc(sizeof (struct renamesnaparg), KM_SLEEP);
- ra->dstg = dsl_sync_task_group_create(spa_get_dsl(spa));
+ dsl_dataset_rele(hds, FTAG);
+}
- ra->oldsnap = strchr(oldname, '@') + 1;
- ra->newsnap = strchr(newname, '@') + 1;
- *ra->failed = '\0';
+int
+dsl_dataset_rename_snapshot(const char *fsname,
+ const char *oldsnapname, const char *newsnapname, boolean_t recursive)
+{
+#ifdef _KERNEL
+ char *oldname, *newname;
+#endif
+ int error;
- err = dmu_objset_find(fsname, dsl_snapshot_rename_one, ra,
- DS_FIND_CHILDREN);
- kmem_free(fsname, len);
+ dsl_dataset_rename_snapshot_arg_t ddrsa;
- if (err == 0) {
- err = dsl_sync_task_group_wait(ra->dstg);
- }
+ ddrsa.ddrsa_fsname = fsname;
+ ddrsa.ddrsa_oldsnapname = oldsnapname;
+ ddrsa.ddrsa_newsnapname = newsnapname;
+ ddrsa.ddrsa_recursive = recursive;
- for (dst = list_head(&ra->dstg->dstg_tasks); dst;
- dst = list_next(&ra->dstg->dstg_tasks, dst)) {
- dsl_dataset_t *ds = dst->dst_arg1;
- if (dst->dst_err) {
- dsl_dir_name(ds->ds_dir, ra->failed);
- (void) strlcat(ra->failed, "@", sizeof (ra->failed));
- (void) strlcat(ra->failed, ra->newsnap,
- sizeof (ra->failed));
- }
- dsl_dataset_rele(ds, ra->dstg);
- }
+ error = dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check,
+ dsl_dataset_rename_snapshot_sync, &ddrsa, 1);
- if (err)
- (void) strlcpy(oldname, ra->failed, sizeof (ra->failed));
+ if (error)
+ return (SET_ERROR(error));
- dsl_sync_task_group_destroy(ra->dstg);
- kmem_free(ra, sizeof (struct renamesnaparg));
- spa_close(spa, FTAG);
- return (err);
+#ifdef _KERNEL
+ oldname = kmem_asprintf("%s@%s", fsname, oldsnapname);
+ newname = kmem_asprintf("%s@%s", fsname, newsnapname);
+ zvol_rename_minors(oldname, newname);
+ strfree(newname);
+ strfree(oldname);
+#endif
+
+ return (0);
}
+/*
+ * If we're doing an ownership handoff, we need to make sure that there is
+ * only one long hold on the dataset. We're not allowed to change anything here
+ * so we don't permanently release the long hold or regular hold here. We want
+ * to do this only when syncing to avoid the dataset unexpectedly going away
+ * when we release the long hold.
+ */
static int
-dsl_valid_rename(const char *oldname, void *arg)
+dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx)
{
- int delta = *(int *)arg;
+ boolean_t held;
+
+ if (!dmu_tx_is_syncing(tx))
+ return (0);
+
+ if (owner != NULL) {
+ VERIFY3P(ds->ds_owner, ==, owner);
+ dsl_dataset_long_rele(ds, owner);
+ }
- if (strlen(oldname) + delta >= MAXNAMELEN)
- return (ENAMETOOLONG);
+ held = dsl_dataset_long_held(ds);
+
+ if (owner != NULL)
+ dsl_dataset_long_hold(ds, owner);
+
+ if (held)
+ return (SET_ERROR(EBUSY));
return (0);
}
-#pragma weak dmu_objset_rename = dsl_dataset_rename
-int
-dsl_dataset_rename(char *oldname, const char *newname, boolean_t recursive)
+typedef struct dsl_dataset_rollback_arg {
+ const char *ddra_fsname;
+ void *ddra_owner;
+ nvlist_t *ddra_result;
+} dsl_dataset_rollback_arg_t;
+
+static int
+dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx)
{
- dsl_dir_t *dd;
+ dsl_dataset_rollback_arg_t *ddra = arg;
+ dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *ds;
- const char *tail;
- int err;
-
- err = dsl_dir_open(oldname, FTAG, &dd, &tail);
- if (err)
- return (err);
-
- if (tail == NULL) {
- int delta = strlen(newname) - strlen(oldname);
+ int64_t unused_refres_delta;
+ int error;
+ nvpair_t *pair;
+ nvlist_t *proprequest, *bookmarks;
- /* if we're growing, validate child name lengths */
- if (delta > 0)
- err = dmu_objset_find(oldname, dsl_valid_rename,
- &delta, DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS);
+ error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds);
+ if (error != 0)
+ return (error);
- if (err == 0)
- err = dsl_dir_rename(dd, newname);
- dsl_dir_close(dd, FTAG);
- return (err);
+ /* must not be a snapshot */
+ if (dsl_dataset_is_snapshot(ds)) {
+ dsl_dataset_rele(ds, FTAG);
+ return (SET_ERROR(EINVAL));
}
- if (tail[0] != '@') {
- /* the name ended in a nonexistent component */
- dsl_dir_close(dd, FTAG);
- return (ENOENT);
+ /* must have a most recent snapshot */
+ if (ds->ds_phys->ds_prev_snap_txg < TXG_INITIAL) {
+ dsl_dataset_rele(ds, FTAG);
+ return (SET_ERROR(EINVAL));
}
- dsl_dir_close(dd, FTAG);
+ /* must not have any bookmarks after the most recent snapshot */
+ proprequest = fnvlist_alloc();
+ fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG));
+ bookmarks = fnvlist_alloc();
+ error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks);
+ fnvlist_free(proprequest);
+ if (error != 0)
+ return (error);
+ for (pair = nvlist_next_nvpair(bookmarks, NULL);
+ pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) {
+ nvlist_t *valuenv =
+ fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair),
+ zfs_prop_to_name(ZFS_PROP_CREATETXG));
+ uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value");
+ if (createtxg > ds->ds_phys->ds_prev_snap_txg) {
+ fnvlist_free(bookmarks);
+ dsl_dataset_rele(ds, FTAG);
+ return (SET_ERROR(EEXIST));
+ }
+ }
+ fnvlist_free(bookmarks);
- /* new name must be snapshot in same filesystem */
- tail = strchr(newname, '@');
- if (tail == NULL)
- return (EINVAL);
- tail++;
- if (strncmp(oldname, newname, tail - newname) != 0)
- return (EXDEV);
+ error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx);
+ if (error != 0) {
+ dsl_dataset_rele(ds, FTAG);
+ return (error);
+ }
- if (recursive) {
- err = dsl_recursive_rename(oldname, newname);
- } else {
- err = dsl_dataset_hold(oldname, FTAG, &ds);
- if (err)
- return (err);
+ /*
+ * Check if the snap we are rolling back to uses more than
+ * the refquota.
+ */
+ if (ds->ds_quota != 0 &&
+ ds->ds_prev->ds_phys->ds_referenced_bytes > ds->ds_quota) {
+ dsl_dataset_rele(ds, FTAG);
+ return (SET_ERROR(EDQUOT));
+ }
- err = dsl_sync_task_do(ds->ds_dir->dd_pool,
- dsl_dataset_snapshot_rename_check,
- dsl_dataset_snapshot_rename_sync, ds, (char *)tail, 1);
+ /*
+ * When we do the clone swap, we will temporarily use more space
+ * due to the refreservation (the head will no longer have any
+ * unique space, so the entire amount of the refreservation will need
+ * to be free). We will immediately destroy the clone, freeing
+ * this space, but the freeing happens over many txg's.
+ */
+ unused_refres_delta = (int64_t)MIN(ds->ds_reserved,
+ ds->ds_phys->ds_unique_bytes);
+ if (unused_refres_delta > 0 &&
+ unused_refres_delta >
+ dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) {
dsl_dataset_rele(ds, FTAG);
+ return (SET_ERROR(ENOSPC));
}
- return (err);
+ dsl_dataset_rele(ds, FTAG);
+ return (0);
}
-struct promotenode {
- list_node_t link;
- dsl_dataset_t *ds;
-};
+static void
+dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx)
+{
+ dsl_dataset_rollback_arg_t *ddra = arg;
+ dsl_pool_t *dp = dmu_tx_pool(tx);
+ dsl_dataset_t *ds, *clone;
+ uint64_t cloneobj;
+ char namebuf[ZFS_MAXNAMELEN];
+
+ VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds));
+
+ dsl_dataset_name(ds->ds_prev, namebuf);
+ fnvlist_add_string(ddra->ddra_result, "target", namebuf);
+
+ cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback",
+ ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx);
+
+ VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone));
+
+ dsl_dataset_clone_swap_sync_impl(clone, ds, tx);
+ dsl_dataset_zero_zil(ds, tx);
+
+ dsl_destroy_head_sync_impl(clone, tx);
+
+ dsl_dataset_rele(clone, FTAG);
+ dsl_dataset_rele(ds, FTAG);
+}
-struct promotearg {
+/*
+ * Rolls back the given filesystem or volume to the most recent snapshot.
+ * The name of the most recent snapshot will be returned under key "target"
+ * in the result nvlist.
+ *
+ * If owner != NULL:
+ * - The existing dataset MUST be owned by the specified owner at entry
+ * - Upon return, dataset will still be held by the same owner, whether we
+ * succeed or not.
+ *
+ * This mode is required any time the existing filesystem is mounted. See
+ * notes above zfs_suspend_fs() for further details.
+ */
+int
+dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result)
+{
+ dsl_dataset_rollback_arg_t ddra;
+
+ ddra.ddra_fsname = fsname;
+ ddra.ddra_owner = owner;
+ ddra.ddra_result = result;
+
+ return (dsl_sync_task(fsname, dsl_dataset_rollback_check,
+ dsl_dataset_rollback_sync, &ddra, 1));
+}
+
+struct promotenode {
+ list_node_t link;
+ dsl_dataset_t *ds;
+};
+
+typedef struct dsl_dataset_promote_arg {
+ const char *ddpa_clonename;
+ dsl_dataset_t *ddpa_clone;
list_t shared_snaps, origin_snaps, clone_snaps;
- dsl_dataset_t *origin_origin;
+ dsl_dataset_t *origin_origin; /* origin of the origin */
uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap;
char *err_ds;
-};
+} dsl_dataset_promote_arg_t;
static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep);
+static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp,
+ void *tag);
+static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag);
static int
-dsl_dataset_promote_check(void *arg1, void *arg2, dmu_tx_t *tx)
+dsl_dataset_promote_check(void *arg, dmu_tx_t *tx)
{
- dsl_dataset_t *hds = arg1;
- struct promotearg *pa = arg2;
- struct promotenode *snap = list_head(&pa->shared_snaps);
- dsl_dataset_t *origin_ds = snap->ds;
+ dsl_dataset_promote_arg_t *ddpa = arg;
+ dsl_pool_t *dp = dmu_tx_pool(tx);
+ dsl_dataset_t *hds;
+ struct promotenode *snap;
+ dsl_dataset_t *origin_ds;
int err;
uint64_t unused;
- /* Check that it is a real clone */
- if (!dsl_dir_is_clone(hds->ds_dir))
- return (EINVAL);
+ err = promote_hold(ddpa, dp, FTAG);
+ if (err != 0)
+ return (err);
- /* Since this is so expensive, don't do the preliminary check */
- if (!dmu_tx_is_syncing(tx))
+ hds = ddpa->ddpa_clone;
+
+ if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE) {
+ promote_rele(ddpa, FTAG);
+ return (SET_ERROR(EXDEV));
+ }
+
+ /*
+ * Compute and check the amount of space to transfer. Since this is
+ * so expensive, don't do the preliminary check.
+ */
+ if (!dmu_tx_is_syncing(tx)) {
+ promote_rele(ddpa, FTAG);
return (0);
+ }
- if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE)
- return (EXDEV);
+ snap = list_head(&ddpa->shared_snaps);
+ origin_ds = snap->ds;
/* compute origin's new unique space */
- snap = list_tail(&pa->clone_snaps);
+ snap = list_tail(&ddpa->clone_snaps);
ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object);
dsl_deadlist_space_range(&snap->ds->ds_deadlist,
origin_ds->ds_phys->ds_prev_snap_txg, UINT64_MAX,
- &pa->unique, &unused, &unused);
+ &ddpa->unique, &unused, &unused);
/*
* Walk the snapshots that we are moving
*
* Compute space to transfer. Consider the incremental changes
- * to used for each snapshot:
+ * to used by each snapshot:
* (my used) = (prev's used) + (blocks born) - (blocks killed)
* So each snapshot gave birth to:
* (blocks born) = (my used) - (prev's used) + (blocks killed)
* Note however, if we stop before we reach the ORIGIN we get:
* uN + kN + kN-1 + ... + kM - uM-1
*/
- pa->used = origin_ds->ds_phys->ds_referenced_bytes;
- pa->comp = origin_ds->ds_phys->ds_compressed_bytes;
- pa->uncomp = origin_ds->ds_phys->ds_uncompressed_bytes;
- for (snap = list_head(&pa->shared_snaps); snap;
- snap = list_next(&pa->shared_snaps, snap)) {
+ ddpa->used = origin_ds->ds_phys->ds_referenced_bytes;
+ ddpa->comp = origin_ds->ds_phys->ds_compressed_bytes;
+ ddpa->uncomp = origin_ds->ds_phys->ds_uncompressed_bytes;
+ for (snap = list_head(&ddpa->shared_snaps); snap;
+ snap = list_next(&ddpa->shared_snaps, snap)) {
uint64_t val, dlused, dlcomp, dluncomp;
dsl_dataset_t *ds = snap->ds;
+ /*
+ * If there are long holds, we won't be able to evict
+ * the objset.
+ */
+ if (dsl_dataset_long_held(ds)) {
+ err = SET_ERROR(EBUSY);
+ goto out;
+ }
+
/* Check that the snapshot name does not conflict */
- VERIFY(0 == dsl_dataset_get_snapname(ds));
+ VERIFY0(dsl_dataset_get_snapname(ds));
err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val);
if (err == 0) {
- err = EEXIST;
+ (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname);
+ err = SET_ERROR(EEXIST);
goto out;
}
if (err != ENOENT)
dsl_deadlist_space(&ds->ds_deadlist,
&dlused, &dlcomp, &dluncomp);
- pa->used += dlused;
- pa->comp += dlcomp;
- pa->uncomp += dluncomp;
+ ddpa->used += dlused;
+ ddpa->comp += dlcomp;
+ ddpa->uncomp += dluncomp;
}
/*
* If we are a clone of a clone then we never reached ORIGIN,
* so we need to subtract out the clone origin's used space.
*/
- if (pa->origin_origin) {
- pa->used -= pa->origin_origin->ds_phys->ds_referenced_bytes;
- pa->comp -= pa->origin_origin->ds_phys->ds_compressed_bytes;
- pa->uncomp -= pa->origin_origin->ds_phys->ds_uncompressed_bytes;
+ if (ddpa->origin_origin) {
+ ddpa->used -= ddpa->origin_origin->ds_phys->ds_referenced_bytes;
+ ddpa->comp -= ddpa->origin_origin->ds_phys->ds_compressed_bytes;
+ ddpa->uncomp -=
+ ddpa->origin_origin->ds_phys->ds_uncompressed_bytes;
}
/* Check that there is enough space here */
err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir,
- pa->used);
- if (err)
- return (err);
+ ddpa->used);
+ if (err != 0)
+ goto out;
/*
* Compute the amounts of space that will be used by snapshots
* calls will be fast because they do not have to
* iterate over all bps.
*/
- snap = list_head(&pa->origin_snaps);
- err = snaplist_space(&pa->shared_snaps,
- snap->ds->ds_dir->dd_origin_txg, &pa->cloneusedsnap);
- if (err)
- return (err);
+ snap = list_head(&ddpa->origin_snaps);
+ err = snaplist_space(&ddpa->shared_snaps,
+ snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap);
+ if (err != 0)
+ goto out;
- err = snaplist_space(&pa->clone_snaps,
+ err = snaplist_space(&ddpa->clone_snaps,
snap->ds->ds_dir->dd_origin_txg, &space);
- if (err)
- return (err);
- pa->cloneusedsnap += space;
+ if (err != 0)
+ goto out;
+ ddpa->cloneusedsnap += space;
}
if (origin_ds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) {
- err = snaplist_space(&pa->origin_snaps,
- origin_ds->ds_phys->ds_creation_txg, &pa->originusedsnap);
- if (err)
- return (err);
+ err = snaplist_space(&ddpa->origin_snaps,
+ origin_ds->ds_phys->ds_creation_txg, &ddpa->originusedsnap);
+ if (err != 0)
+ goto out;
}
- return (0);
out:
- pa->err_ds = snap->ds->ds_snapname;
+ promote_rele(ddpa, FTAG);
return (err);
}
static void
-dsl_dataset_promote_sync(void *arg1, void *arg2, dmu_tx_t *tx)
+dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx)
{
- dsl_dataset_t *hds = arg1;
- struct promotearg *pa = arg2;
- struct promotenode *snap = list_head(&pa->shared_snaps);
- dsl_dataset_t *origin_ds = snap->ds;
+ dsl_dataset_promote_arg_t *ddpa = arg;
+ dsl_pool_t *dp = dmu_tx_pool(tx);
+ dsl_dataset_t *hds;
+ struct promotenode *snap;
+ dsl_dataset_t *origin_ds;
dsl_dataset_t *origin_head;
- dsl_dir_t *dd = hds->ds_dir;
- dsl_pool_t *dp = hds->ds_dir->dd_pool;
+ dsl_dir_t *dd;
dsl_dir_t *odd = NULL;
uint64_t oldnext_obj;
int64_t delta;
- ASSERT(0 == (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE));
+ VERIFY0(promote_hold(ddpa, dp, FTAG));
+ hds = ddpa->ddpa_clone;
+
+ ASSERT0(hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE);
- snap = list_head(&pa->origin_snaps);
+ snap = list_head(&ddpa->shared_snaps);
+ origin_ds = snap->ds;
+ dd = hds->ds_dir;
+
+ snap = list_head(&ddpa->origin_snaps);
origin_head = snap->ds;
/*
* We need to explicitly open odd, since origin_ds's dd will be
* changing.
*/
- VERIFY(0 == dsl_dir_open_obj(dp, origin_ds->ds_dir->dd_object,
+ VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object,
NULL, FTAG, &odd));
/* change origin's next snap */
dmu_buf_will_dirty(origin_ds->ds_dbuf, tx);
oldnext_obj = origin_ds->ds_phys->ds_next_snap_obj;
- snap = list_tail(&pa->clone_snaps);
+ snap = list_tail(&ddpa->clone_snaps);
ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object);
origin_ds->ds_phys->ds_next_snap_obj = snap->ds->ds_object;
/* change the origin's next clone */
if (origin_ds->ds_phys->ds_next_clones_obj) {
- remove_from_next_clones(origin_ds, snap->ds->ds_object, tx);
- VERIFY3U(0, ==, zap_add_int(dp->dp_meta_objset,
+ dsl_dataset_remove_from_next_clones(origin_ds,
+ snap->ds->ds_object, tx);
+ VERIFY0(zap_add_int(dp->dp_meta_objset,
origin_ds->ds_phys->ds_next_clones_obj,
oldnext_obj, tx));
}
/* change dd_clone entries */
if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
- VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset,
+ VERIFY0(zap_remove_int(dp->dp_meta_objset,
odd->dd_phys->dd_clones, hds->ds_object, tx));
- VERIFY3U(0, ==, zap_add_int(dp->dp_meta_objset,
- pa->origin_origin->ds_dir->dd_phys->dd_clones,
+ VERIFY0(zap_add_int(dp->dp_meta_objset,
+ ddpa->origin_origin->ds_dir->dd_phys->dd_clones,
hds->ds_object, tx));
- VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset,
- pa->origin_origin->ds_dir->dd_phys->dd_clones,
+ VERIFY0(zap_remove_int(dp->dp_meta_objset,
+ ddpa->origin_origin->ds_dir->dd_phys->dd_clones,
origin_head->ds_object, tx));
if (dd->dd_phys->dd_clones == 0) {
dd->dd_phys->dd_clones = zap_create(dp->dp_meta_objset,
DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx);
}
- VERIFY3U(0, ==, zap_add_int(dp->dp_meta_objset,
+ VERIFY0(zap_add_int(dp->dp_meta_objset,
dd->dd_phys->dd_clones, origin_head->ds_object, tx));
-
}
/* move snapshots to this dir */
- for (snap = list_head(&pa->shared_snaps); snap;
- snap = list_next(&pa->shared_snaps, snap)) {
+ for (snap = list_head(&ddpa->shared_snaps); snap;
+ snap = list_next(&ddpa->shared_snaps, snap)) {
dsl_dataset_t *ds = snap->ds;
- /* unregister props as dsl_dir is changing */
+ /*
+ * Property callbacks are registered to a particular
+ * dsl_dir. Since ours is changing, evict the objset
+ * so that they will be unregistered from the old dsl_dir.
+ */
if (ds->ds_objset) {
dmu_objset_evict(ds->ds_objset);
ds->ds_objset = NULL;
}
+
/* move snap name entry */
- VERIFY(0 == dsl_dataset_get_snapname(ds));
- VERIFY(0 == dsl_dataset_snap_remove(origin_head,
+ VERIFY0(dsl_dataset_get_snapname(ds));
+ VERIFY0(dsl_dataset_snap_remove(origin_head,
ds->ds_snapname, tx));
- VERIFY(0 == zap_add(dp->dp_meta_objset,
+ VERIFY0(zap_add(dp->dp_meta_objset,
hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname,
8, 1, &ds->ds_object, tx));
/* change containing dsl_dir */
dmu_buf_will_dirty(ds->ds_dbuf, tx);
- ASSERT3U(ds->ds_phys->ds_dir_obj, ==, odd->dd_object);
- ds->ds_phys->ds_dir_obj = dd->dd_object;
- ASSERT3P(ds->ds_dir, ==, odd);
- dsl_dir_close(ds->ds_dir, ds);
- VERIFY(0 == dsl_dir_open_obj(dp, dd->dd_object,
- NULL, ds, &ds->ds_dir));
-
- /* move any clone references */
- if (ds->ds_phys->ds_next_clones_obj &&
- spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
- zap_cursor_t zc;
- zap_attribute_t za;
-
- for (zap_cursor_init(&zc, dp->dp_meta_objset,
- ds->ds_phys->ds_next_clones_obj);
- zap_cursor_retrieve(&zc, &za) == 0;
- zap_cursor_advance(&zc)) {
- dsl_dataset_t *cnds;
- uint64_t o;
-
- if (za.za_first_integer == oldnext_obj) {
- /*
- * We've already moved the
- * origin's reference.
- */
- continue;
- }
-
- VERIFY3U(0, ==, dsl_dataset_hold_obj(dp,
- za.za_first_integer, FTAG, &cnds));
- o = cnds->ds_dir->dd_phys->dd_head_dataset_obj;
-
- VERIFY3U(zap_remove_int(dp->dp_meta_objset,
- odd->dd_phys->dd_clones, o, tx), ==, 0);
- VERIFY3U(zap_add_int(dp->dp_meta_objset,
- dd->dd_phys->dd_clones, o, tx), ==, 0);
- dsl_dataset_rele(cnds, FTAG);
- }
- zap_cursor_fini(&zc);
- }
-
- ASSERT0(dsl_prop_numcb(ds));
- }
-
- /*
- * Change space accounting.
- * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
- * both be valid, or both be 0 (resulting in delta == 0). This
- * is true for each of {clone,origin} independently.
- */
-
- delta = pa->cloneusedsnap -
- dd->dd_phys->dd_used_breakdown[DD_USED_SNAP];
- ASSERT3S(delta, >=, 0);
- ASSERT3U(pa->used, >=, delta);
- dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx);
- dsl_dir_diduse_space(dd, DD_USED_HEAD,
- pa->used - delta, pa->comp, pa->uncomp, tx);
-
- delta = pa->originusedsnap -
- odd->dd_phys->dd_used_breakdown[DD_USED_SNAP];
- ASSERT3S(delta, <=, 0);
- ASSERT3U(pa->used, >=, -delta);
- dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx);
- dsl_dir_diduse_space(odd, DD_USED_HEAD,
- -pa->used - delta, -pa->comp, -pa->uncomp, tx);
-
- origin_ds->ds_phys->ds_unique_bytes = pa->unique;
-
- /* log history record */
- spa_history_log_internal(LOG_DS_PROMOTE, dd->dd_pool->dp_spa, tx,
- "dataset = %llu", hds->ds_object);
-
- dsl_dir_close(odd, FTAG);
-}
-
-static char *snaplist_tag = "snaplist";
-/*
- * Make a list of dsl_dataset_t's for the snapshots between first_obj
- * (exclusive) and last_obj (inclusive). The list will be in reverse
- * order (last_obj will be the list_head()). If first_obj == 0, do all
- * snapshots back to this dataset's origin.
- */
-static int
-snaplist_make(dsl_pool_t *dp, boolean_t own,
- uint64_t first_obj, uint64_t last_obj, list_t *l)
-{
- uint64_t obj = last_obj;
-
- ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock));
-
- list_create(l, sizeof (struct promotenode),
- offsetof(struct promotenode, link));
-
- while (obj != first_obj) {
- dsl_dataset_t *ds;
- struct promotenode *snap;
- int err;
-
- if (own) {
- err = dsl_dataset_own_obj(dp, obj,
- 0, snaplist_tag, &ds);
- if (err == 0)
- dsl_dataset_make_exclusive(ds, snaplist_tag);
- } else {
- err = dsl_dataset_hold_obj(dp, obj, snaplist_tag, &ds);
- }
- if (err == ENOENT) {
- /* lost race with snapshot destroy */
- struct promotenode *last = list_tail(l);
- ASSERT(obj != last->ds->ds_phys->ds_prev_snap_obj);
- obj = last->ds->ds_phys->ds_prev_snap_obj;
- continue;
- } else if (err) {
- return (err);
- }
-
- if (first_obj == 0)
- first_obj = ds->ds_dir->dd_phys->dd_origin_obj;
-
- snap = kmem_alloc(sizeof (struct promotenode), KM_SLEEP);
- snap->ds = ds;
- list_insert_tail(l, snap);
- obj = ds->ds_phys->ds_prev_snap_obj;
- }
-
- return (0);
-}
-
-static int
-snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep)
-{
- struct promotenode *snap;
-
- *spacep = 0;
- for (snap = list_head(l); snap; snap = list_next(l, snap)) {
- uint64_t used, comp, uncomp;
- dsl_deadlist_space_range(&snap->ds->ds_deadlist,
- mintxg, UINT64_MAX, &used, &comp, &uncomp);
- *spacep += used;
- }
- return (0);
-}
-
-static void
-snaplist_destroy(list_t *l, boolean_t own)
-{
- struct promotenode *snap;
-
- if (!l || !list_link_active(&l->list_head))
- return;
-
- while ((snap = list_tail(l)) != NULL) {
- list_remove(l, snap);
- if (own)
- dsl_dataset_disown(snap->ds, snaplist_tag);
- else
- dsl_dataset_rele(snap->ds, snaplist_tag);
- kmem_free(snap, sizeof (struct promotenode));
- }
- list_destroy(l);
-}
-
-/*
- * Promote a clone. Nomenclature note:
- * "clone" or "cds": the original clone which is being promoted
- * "origin" or "ods": the snapshot which is originally clone's origin
- * "origin head" or "ohds": the dataset which is the head
- * (filesystem/volume) for the origin
- * "origin origin": the origin of the origin's filesystem (typically
- * NULL, indicating that the clone is not a clone of a clone).
- */
-int
-dsl_dataset_promote(const char *name, char *conflsnap)
-{
- dsl_dataset_t *ds;
- dsl_dir_t *dd;
- dsl_pool_t *dp;
- dmu_object_info_t doi;
- struct promotearg pa;
- struct promotenode *snap;
- int err;
-
- bzero(&pa, sizeof(struct promotearg));
- err = dsl_dataset_hold(name, FTAG, &ds);
- if (err)
- return (err);
- dd = ds->ds_dir;
- dp = dd->dd_pool;
-
- err = dmu_object_info(dp->dp_meta_objset,
- ds->ds_phys->ds_snapnames_zapobj, &doi);
- if (err) {
- dsl_dataset_rele(ds, FTAG);
- return (err);
- }
-
- if (dsl_dataset_is_snapshot(ds) || dd->dd_phys->dd_origin_obj == 0) {
- dsl_dataset_rele(ds, FTAG);
- return (EINVAL);
- }
-
- /*
- * We are going to inherit all the snapshots taken before our
- * origin (i.e., our new origin will be our parent's origin).
- * Take ownership of them so that we can rename them into our
- * namespace.
- */
- rw_enter(&dp->dp_config_rwlock, RW_READER);
-
- err = snaplist_make(dp, B_TRUE, 0, dd->dd_phys->dd_origin_obj,
- &pa.shared_snaps);
- if (err != 0)
- goto out;
-
- err = snaplist_make(dp, B_FALSE, 0, ds->ds_object, &pa.clone_snaps);
- if (err != 0)
- goto out;
-
- snap = list_head(&pa.shared_snaps);
- ASSERT3U(snap->ds->ds_object, ==, dd->dd_phys->dd_origin_obj);
- err = snaplist_make(dp, B_FALSE, dd->dd_phys->dd_origin_obj,
- snap->ds->ds_dir->dd_phys->dd_head_dataset_obj, &pa.origin_snaps);
- if (err != 0)
- goto out;
-
- if (snap->ds->ds_dir->dd_phys->dd_origin_obj != 0) {
- err = dsl_dataset_hold_obj(dp,
- snap->ds->ds_dir->dd_phys->dd_origin_obj,
- FTAG, &pa.origin_origin);
- if (err != 0)
- goto out;
- }
-
-out:
- rw_exit(&dp->dp_config_rwlock);
-
- /*
- * Add in 128x the snapnames zapobj size, since we will be moving
- * a bunch of snapnames to the promoted ds, and dirtying their
- * bonus buffers.
- */
- if (err == 0) {
- err = dsl_sync_task_do(dp, dsl_dataset_promote_check,
- dsl_dataset_promote_sync, ds, &pa,
- 2 + 2 * doi.doi_physical_blocks_512);
- if (err && pa.err_ds && conflsnap)
- (void) strncpy(conflsnap, pa.err_ds, MAXNAMELEN);
- }
-
- snaplist_destroy(&pa.shared_snaps, B_TRUE);
- snaplist_destroy(&pa.clone_snaps, B_FALSE);
- snaplist_destroy(&pa.origin_snaps, B_FALSE);
- if (pa.origin_origin)
- dsl_dataset_rele(pa.origin_origin, FTAG);
- dsl_dataset_rele(ds, FTAG);
- return (err);
-}
-
-struct cloneswaparg {
- dsl_dataset_t *cds; /* clone dataset */
- dsl_dataset_t *ohds; /* origin's head dataset */
- boolean_t force;
- int64_t unused_refres_delta; /* change in unconsumed refreservation */
-};
-
-/* ARGSUSED */
-static int
-dsl_dataset_clone_swap_check(void *arg1, void *arg2, dmu_tx_t *tx)
-{
- struct cloneswaparg *csa = arg1;
-
- /* they should both be heads */
- if (dsl_dataset_is_snapshot(csa->cds) ||
- dsl_dataset_is_snapshot(csa->ohds))
- return (EINVAL);
-
- /* the branch point should be just before them */
- if (csa->cds->ds_prev != csa->ohds->ds_prev)
- return (EINVAL);
-
- /* cds should be the clone (unless they are unrelated) */
- if (csa->cds->ds_prev != NULL &&
- csa->cds->ds_prev != csa->cds->ds_dir->dd_pool->dp_origin_snap &&
- csa->ohds->ds_object !=
- csa->cds->ds_prev->ds_phys->ds_next_snap_obj)
- return (EINVAL);
-
- /* the clone should be a child of the origin */
- if (csa->cds->ds_dir->dd_parent != csa->ohds->ds_dir)
- return (EINVAL);
-
- /* ohds shouldn't be modified unless 'force' */
- if (!csa->force && dsl_dataset_modified_since_lastsnap(csa->ohds))
- return (ETXTBSY);
-
- /* adjust amount of any unconsumed refreservation */
- csa->unused_refres_delta =
- (int64_t)MIN(csa->ohds->ds_reserved,
- csa->ohds->ds_phys->ds_unique_bytes) -
- (int64_t)MIN(csa->ohds->ds_reserved,
- csa->cds->ds_phys->ds_unique_bytes);
-
- if (csa->unused_refres_delta > 0 &&
- csa->unused_refres_delta >
- dsl_dir_space_available(csa->ohds->ds_dir, NULL, 0, TRUE))
- return (ENOSPC);
-
- if (csa->ohds->ds_quota != 0 &&
- csa->cds->ds_phys->ds_unique_bytes > csa->ohds->ds_quota)
- return (EDQUOT);
-
- return (0);
-}
-
-/* ARGSUSED */
-static void
-dsl_dataset_clone_swap_sync(void *arg1, void *arg2, dmu_tx_t *tx)
-{
- struct cloneswaparg *csa = arg1;
- dsl_pool_t *dp = csa->cds->ds_dir->dd_pool;
-
- ASSERT(csa->cds->ds_reserved == 0);
- ASSERT(csa->ohds->ds_quota == 0 ||
- csa->cds->ds_phys->ds_unique_bytes <= csa->ohds->ds_quota);
-
- dmu_buf_will_dirty(csa->cds->ds_dbuf, tx);
- dmu_buf_will_dirty(csa->ohds->ds_dbuf, tx);
-
- if (csa->cds->ds_objset != NULL) {
- dmu_objset_evict(csa->cds->ds_objset);
- csa->cds->ds_objset = NULL;
- }
-
- if (csa->ohds->ds_objset != NULL) {
- dmu_objset_evict(csa->ohds->ds_objset);
- csa->ohds->ds_objset = NULL;
- }
-
- /*
- * Reset origin's unique bytes, if it exists.
- */
- if (csa->cds->ds_prev) {
- dsl_dataset_t *origin = csa->cds->ds_prev;
- uint64_t comp, uncomp;
-
- dmu_buf_will_dirty(origin->ds_dbuf, tx);
- dsl_deadlist_space_range(&csa->cds->ds_deadlist,
- origin->ds_phys->ds_prev_snap_txg, UINT64_MAX,
- &origin->ds_phys->ds_unique_bytes, &comp, &uncomp);
- }
-
- /* swap blkptrs */
- {
- blkptr_t tmp;
- tmp = csa->ohds->ds_phys->ds_bp;
- csa->ohds->ds_phys->ds_bp = csa->cds->ds_phys->ds_bp;
- csa->cds->ds_phys->ds_bp = tmp;
- }
-
- /* set dd_*_bytes */
- {
- int64_t dused, dcomp, duncomp;
- uint64_t cdl_used, cdl_comp, cdl_uncomp;
- uint64_t odl_used, odl_comp, odl_uncomp;
-
- ASSERT3U(csa->cds->ds_dir->dd_phys->
- dd_used_breakdown[DD_USED_SNAP], ==, 0);
-
- dsl_deadlist_space(&csa->cds->ds_deadlist,
- &cdl_used, &cdl_comp, &cdl_uncomp);
- dsl_deadlist_space(&csa->ohds->ds_deadlist,
- &odl_used, &odl_comp, &odl_uncomp);
-
- dused = csa->cds->ds_phys->ds_referenced_bytes + cdl_used -
- (csa->ohds->ds_phys->ds_referenced_bytes + odl_used);
- dcomp = csa->cds->ds_phys->ds_compressed_bytes + cdl_comp -
- (csa->ohds->ds_phys->ds_compressed_bytes + odl_comp);
- duncomp = csa->cds->ds_phys->ds_uncompressed_bytes +
- cdl_uncomp -
- (csa->ohds->ds_phys->ds_uncompressed_bytes + odl_uncomp);
-
- dsl_dir_diduse_space(csa->ohds->ds_dir, DD_USED_HEAD,
- dused, dcomp, duncomp, tx);
- dsl_dir_diduse_space(csa->cds->ds_dir, DD_USED_HEAD,
- -dused, -dcomp, -duncomp, tx);
-
- /*
- * The difference in the space used by snapshots is the
- * difference in snapshot space due to the head's
- * deadlist (since that's the only thing that's
- * changing that affects the snapused).
- */
- dsl_deadlist_space_range(&csa->cds->ds_deadlist,
- csa->ohds->ds_dir->dd_origin_txg, UINT64_MAX,
- &cdl_used, &cdl_comp, &cdl_uncomp);
- dsl_deadlist_space_range(&csa->ohds->ds_deadlist,
- csa->ohds->ds_dir->dd_origin_txg, UINT64_MAX,
- &odl_used, &odl_comp, &odl_uncomp);
- dsl_dir_transfer_space(csa->ohds->ds_dir, cdl_used - odl_used,
- DD_USED_HEAD, DD_USED_SNAP, tx);
- }
-
- /* swap ds_*_bytes */
- SWITCH64(csa->ohds->ds_phys->ds_referenced_bytes,
- csa->cds->ds_phys->ds_referenced_bytes);
- SWITCH64(csa->ohds->ds_phys->ds_compressed_bytes,
- csa->cds->ds_phys->ds_compressed_bytes);
- SWITCH64(csa->ohds->ds_phys->ds_uncompressed_bytes,
- csa->cds->ds_phys->ds_uncompressed_bytes);
- SWITCH64(csa->ohds->ds_phys->ds_unique_bytes,
- csa->cds->ds_phys->ds_unique_bytes);
-
- /* apply any parent delta for change in unconsumed refreservation */
- dsl_dir_diduse_space(csa->ohds->ds_dir, DD_USED_REFRSRV,
- csa->unused_refres_delta, 0, 0, tx);
-
- /*
- * Swap deadlists.
- */
- dsl_deadlist_close(&csa->cds->ds_deadlist);
- dsl_deadlist_close(&csa->ohds->ds_deadlist);
- SWITCH64(csa->ohds->ds_phys->ds_deadlist_obj,
- csa->cds->ds_phys->ds_deadlist_obj);
- dsl_deadlist_open(&csa->cds->ds_deadlist, dp->dp_meta_objset,
- csa->cds->ds_phys->ds_deadlist_obj);
- dsl_deadlist_open(&csa->ohds->ds_deadlist, dp->dp_meta_objset,
- csa->ohds->ds_phys->ds_deadlist_obj);
-
- dsl_scan_ds_clone_swapped(csa->ohds, csa->cds, tx);
-}
-
-/*
- * Swap 'clone' with its origin head datasets. Used at the end of "zfs
- * recv" into an existing fs to swizzle the file system to the new
- * version, and by "zfs rollback". Can also be used to swap two
- * independent head datasets if neither has any snapshots.
- */
-int
-dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head,
- boolean_t force)
-{
- struct cloneswaparg csa;
- int error;
-
- ASSERT(clone->ds_owner);
- ASSERT(origin_head->ds_owner);
-retry:
- /*
- * Need exclusive access for the swap. If we're swapping these
- * datasets back after an error, we already hold the locks.
- */
- if (!RW_WRITE_HELD(&clone->ds_rwlock))
- rw_enter(&clone->ds_rwlock, RW_WRITER);
- if (!RW_WRITE_HELD(&origin_head->ds_rwlock) &&
- !rw_tryenter(&origin_head->ds_rwlock, RW_WRITER)) {
- rw_exit(&clone->ds_rwlock);
- rw_enter(&origin_head->ds_rwlock, RW_WRITER);
- if (!rw_tryenter(&clone->ds_rwlock, RW_WRITER)) {
- rw_exit(&origin_head->ds_rwlock);
- goto retry;
- }
- }
- csa.cds = clone;
- csa.ohds = origin_head;
- csa.force = force;
- error = dsl_sync_task_do(clone->ds_dir->dd_pool,
- dsl_dataset_clone_swap_check,
- dsl_dataset_clone_swap_sync, &csa, NULL, 9);
- return (error);
-}
-
-/*
- * Given a pool name and a dataset object number in that pool,
- * return the name of that dataset.
- */
-int
-dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf)
-{
- spa_t *spa;
- dsl_pool_t *dp;
- dsl_dataset_t *ds;
- int error;
+ ASSERT3U(ds->ds_phys->ds_dir_obj, ==, odd->dd_object);
+ ds->ds_phys->ds_dir_obj = dd->dd_object;
+ ASSERT3P(ds->ds_dir, ==, odd);
+ dsl_dir_rele(ds->ds_dir, ds);
+ VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object,
+ NULL, ds, &ds->ds_dir));
- if ((error = spa_open(pname, &spa, FTAG)) != 0)
- return (error);
- dp = spa_get_dsl(spa);
- rw_enter(&dp->dp_config_rwlock, RW_READER);
- if ((error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds)) == 0) {
- dsl_dataset_name(ds, buf);
- dsl_dataset_rele(ds, FTAG);
- }
- rw_exit(&dp->dp_config_rwlock);
- spa_close(spa, FTAG);
+ /* move any clone references */
+ if (ds->ds_phys->ds_next_clones_obj &&
+ spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
+ zap_cursor_t zc;
+ zap_attribute_t za;
- return (error);
-}
+ for (zap_cursor_init(&zc, dp->dp_meta_objset,
+ ds->ds_phys->ds_next_clones_obj);
+ zap_cursor_retrieve(&zc, &za) == 0;
+ zap_cursor_advance(&zc)) {
+ dsl_dataset_t *cnds;
+ uint64_t o;
-int
-dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
- uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv)
-{
- int error = 0;
+ if (za.za_first_integer == oldnext_obj) {
+ /*
+ * We've already moved the
+ * origin's reference.
+ */
+ continue;
+ }
- ASSERT3S(asize, >, 0);
+ VERIFY0(dsl_dataset_hold_obj(dp,
+ za.za_first_integer, FTAG, &cnds));
+ o = cnds->ds_dir->dd_phys->dd_head_dataset_obj;
- /*
- * *ref_rsrv is the portion of asize that will come from any
- * unconsumed refreservation space.
- */
- *ref_rsrv = 0;
+ VERIFY0(zap_remove_int(dp->dp_meta_objset,
+ odd->dd_phys->dd_clones, o, tx));
+ VERIFY0(zap_add_int(dp->dp_meta_objset,
+ dd->dd_phys->dd_clones, o, tx));
+ dsl_dataset_rele(cnds, FTAG);
+ }
+ zap_cursor_fini(&zc);
+ }
- mutex_enter(&ds->ds_lock);
- /*
- * Make a space adjustment for reserved bytes.
- */
- if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) {
- ASSERT3U(*used, >=,
- ds->ds_reserved - ds->ds_phys->ds_unique_bytes);
- *used -= (ds->ds_reserved - ds->ds_phys->ds_unique_bytes);
- *ref_rsrv =
- asize - MIN(asize, parent_delta(ds, asize + inflight));
+ ASSERT(!dsl_prop_hascb(ds));
}
- if (!check_quota || ds->ds_quota == 0) {
- mutex_exit(&ds->ds_lock);
- return (0);
- }
/*
- * 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 and there are no pending changes (which
- * may free up space for us).
+ * Change space accounting.
+ * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
+ * both be valid, or both be 0 (resulting in delta == 0). This
+ * is true for each of {clone,origin} independently.
*/
- if (ds->ds_phys->ds_referenced_bytes + inflight >= ds->ds_quota) {
- if (inflight > 0 ||
- ds->ds_phys->ds_referenced_bytes < ds->ds_quota)
- error = ERESTART;
- else
- error = EDQUOT;
- DMU_TX_STAT_BUMP(dmu_tx_quota);
- }
- mutex_exit(&ds->ds_lock);
+ delta = ddpa->cloneusedsnap -
+ dd->dd_phys->dd_used_breakdown[DD_USED_SNAP];
+ ASSERT3S(delta, >=, 0);
+ ASSERT3U(ddpa->used, >=, delta);
+ dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx);
+ dsl_dir_diduse_space(dd, DD_USED_HEAD,
+ ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx);
- return (error);
+ delta = ddpa->originusedsnap -
+ odd->dd_phys->dd_used_breakdown[DD_USED_SNAP];
+ ASSERT3S(delta, <=, 0);
+ ASSERT3U(ddpa->used, >=, -delta);
+ dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx);
+ dsl_dir_diduse_space(odd, DD_USED_HEAD,
+ -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx);
+
+ origin_ds->ds_phys->ds_unique_bytes = ddpa->unique;
+
+ /* log history record */
+ spa_history_log_internal_ds(hds, "promote", tx, "");
+
+ dsl_dir_rele(odd, FTAG);
+ promote_rele(ddpa, FTAG);
}
-/* ARGSUSED */
+/*
+ * Make a list of dsl_dataset_t's for the snapshots between first_obj
+ * (exclusive) and last_obj (inclusive). The list will be in reverse
+ * order (last_obj will be the list_head()). If first_obj == 0, do all
+ * snapshots back to this dataset's origin.
+ */
static int
-dsl_dataset_set_quota_check(void *arg1, void *arg2, dmu_tx_t *tx)
+snaplist_make(dsl_pool_t *dp,
+ uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag)
{
- dsl_dataset_t *ds = arg1;
- dsl_prop_setarg_t *psa = arg2;
- int err;
+ uint64_t obj = last_obj;
- if (spa_version(ds->ds_dir->dd_pool->dp_spa) < SPA_VERSION_REFQUOTA)
- return (ENOTSUP);
+ list_create(l, sizeof (struct promotenode),
+ offsetof(struct promotenode, link));
- if ((err = dsl_prop_predict_sync(ds->ds_dir, psa)) != 0)
- return (err);
+ while (obj != first_obj) {
+ dsl_dataset_t *ds;
+ struct promotenode *snap;
+ int err;
- if (psa->psa_effective_value == 0)
- return (0);
+ err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
+ ASSERT(err != ENOENT);
+ if (err != 0)
+ return (err);
+
+ if (first_obj == 0)
+ first_obj = ds->ds_dir->dd_phys->dd_origin_obj;
- if (psa->psa_effective_value < ds->ds_phys->ds_referenced_bytes ||
- psa->psa_effective_value < ds->ds_reserved)
- return (ENOSPC);
+ snap = kmem_alloc(sizeof (*snap), KM_SLEEP);
+ snap->ds = ds;
+ list_insert_tail(l, snap);
+ obj = ds->ds_phys->ds_prev_snap_obj;
+ }
return (0);
}
-extern void dsl_prop_set_sync(void *, void *, dmu_tx_t *);
-
-void
-dsl_dataset_set_quota_sync(void *arg1, void *arg2, dmu_tx_t *tx)
+static int
+snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep)
{
- dsl_dataset_t *ds = arg1;
- dsl_prop_setarg_t *psa = arg2;
- uint64_t effective_value = psa->psa_effective_value;
-
- dsl_prop_set_sync(ds, psa, tx);
- DSL_PROP_CHECK_PREDICTION(ds->ds_dir, psa);
+ struct promotenode *snap;
- if (ds->ds_quota != effective_value) {
- dmu_buf_will_dirty(ds->ds_dbuf, tx);
- ds->ds_quota = effective_value;
+ *spacep = 0;
+ for (snap = list_head(l); snap; snap = list_next(l, snap)) {
+ uint64_t used, comp, uncomp;
+ dsl_deadlist_space_range(&snap->ds->ds_deadlist,
+ mintxg, UINT64_MAX, &used, &comp, &uncomp);
+ *spacep += used;
}
+ return (0);
}
-int
-dsl_dataset_set_quota(const char *dsname, zprop_source_t source, uint64_t quota)
+static void
+snaplist_destroy(list_t *l, void *tag)
{
- dsl_dataset_t *ds;
- dsl_prop_setarg_t psa;
- int err;
-
- dsl_prop_setarg_init_uint64(&psa, "refquota", source, "a);
-
- err = dsl_dataset_hold(dsname, FTAG, &ds);
- if (err)
- return (err);
-
- /*
- * If someone removes a file, then tries to set the quota, we
- * want to make sure the file freeing takes effect.
- */
- txg_wait_open(ds->ds_dir->dd_pool, 0);
+ struct promotenode *snap;
- err = dsl_sync_task_do(ds->ds_dir->dd_pool,
- dsl_dataset_set_quota_check, dsl_dataset_set_quota_sync,
- ds, &psa, 0);
+ if (l == NULL || !list_link_active(&l->list_head))
+ return;
- dsl_dataset_rele(ds, FTAG);
- return (err);
+ while ((snap = list_tail(l)) != NULL) {
+ list_remove(l, snap);
+ dsl_dataset_rele(snap->ds, tag);
+ kmem_free(snap, sizeof (*snap));
+ }
+ list_destroy(l);
}
static int
-dsl_dataset_set_reservation_check(void *arg1, void *arg2, dmu_tx_t *tx)
+promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag)
{
- dsl_dataset_t *ds = arg1;
- dsl_prop_setarg_t *psa = arg2;
- uint64_t effective_value;
- uint64_t unique;
- int err;
-
- if (spa_version(ds->ds_dir->dd_pool->dp_spa) <
- SPA_VERSION_REFRESERVATION)
- return (ENOTSUP);
-
- if (dsl_dataset_is_snapshot(ds))
- return (EINVAL);
+ int error;
+ dsl_dir_t *dd;
+ struct promotenode *snap;
- if ((err = dsl_prop_predict_sync(ds->ds_dir, psa)) != 0)
- return (err);
+ error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag,
+ &ddpa->ddpa_clone);
+ if (error != 0)
+ return (error);
+ dd = ddpa->ddpa_clone->ds_dir;
- effective_value = psa->psa_effective_value;
+ if (dsl_dataset_is_snapshot(ddpa->ddpa_clone) ||
+ !dsl_dir_is_clone(dd)) {
+ dsl_dataset_rele(ddpa->ddpa_clone, tag);
+ return (SET_ERROR(EINVAL));
+ }
- /*
- * If we are doing the preliminary check in open context, the
- * space estimates may be inaccurate.
- */
- if (!dmu_tx_is_syncing(tx))
- return (0);
+ error = snaplist_make(dp, 0, dd->dd_phys->dd_origin_obj,
+ &ddpa->shared_snaps, tag);
+ if (error != 0)
+ goto out;
- mutex_enter(&ds->ds_lock);
- if (!DS_UNIQUE_IS_ACCURATE(ds))
- dsl_dataset_recalc_head_uniq(ds);
- unique = ds->ds_phys->ds_unique_bytes;
- mutex_exit(&ds->ds_lock);
+ error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object,
+ &ddpa->clone_snaps, tag);
+ if (error != 0)
+ goto out;
- if (MAX(unique, effective_value) > MAX(unique, ds->ds_reserved)) {
- uint64_t delta = MAX(unique, effective_value) -
- MAX(unique, ds->ds_reserved);
+ snap = list_head(&ddpa->shared_snaps);
+ ASSERT3U(snap->ds->ds_object, ==, dd->dd_phys->dd_origin_obj);
+ error = snaplist_make(dp, dd->dd_phys->dd_origin_obj,
+ snap->ds->ds_dir->dd_phys->dd_head_dataset_obj,
+ &ddpa->origin_snaps, tag);
+ if (error != 0)
+ goto out;
- if (delta > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE))
- return (ENOSPC);
- if (ds->ds_quota > 0 &&
- effective_value > ds->ds_quota)
- return (ENOSPC);
+ if (snap->ds->ds_dir->dd_phys->dd_origin_obj != 0) {
+ error = dsl_dataset_hold_obj(dp,
+ snap->ds->ds_dir->dd_phys->dd_origin_obj,
+ tag, &ddpa->origin_origin);
+ if (error != 0)
+ goto out;
}
-
- return (0);
+out:
+ if (error != 0)
+ promote_rele(ddpa, tag);
+ return (error);
}
static void
-dsl_dataset_set_reservation_sync(void *arg1, void *arg2, dmu_tx_t *tx)
+promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag)
{
- dsl_dataset_t *ds = arg1;
- dsl_prop_setarg_t *psa = arg2;
- uint64_t effective_value = psa->psa_effective_value;
- uint64_t unique;
- int64_t delta;
+ snaplist_destroy(&ddpa->shared_snaps, tag);
+ snaplist_destroy(&ddpa->clone_snaps, tag);
+ snaplist_destroy(&ddpa->origin_snaps, tag);
+ if (ddpa->origin_origin != NULL)
+ dsl_dataset_rele(ddpa->origin_origin, tag);
+ dsl_dataset_rele(ddpa->ddpa_clone, tag);
+}
- dsl_prop_set_sync(ds, psa, tx);
- DSL_PROP_CHECK_PREDICTION(ds->ds_dir, psa);
+/*
+ * Promote a clone.
+ *
+ * If it fails due to a conflicting snapshot name, "conflsnap" will be filled
+ * in with the name. (It must be at least MAXNAMELEN bytes long.)
+ */
+int
+dsl_dataset_promote(const char *name, char *conflsnap)
+{
+ dsl_dataset_promote_arg_t ddpa = { 0 };
+ uint64_t numsnaps;
+ int error;
+ objset_t *os;
- dmu_buf_will_dirty(ds->ds_dbuf, tx);
+ /*
+ * We will modify space proportional to the number of
+ * snapshots. Compute numsnaps.
+ */
+ error = dmu_objset_hold(name, FTAG, &os);
+ if (error != 0)
+ return (error);
+ error = zap_count(dmu_objset_pool(os)->dp_meta_objset,
+ dmu_objset_ds(os)->ds_phys->ds_snapnames_zapobj, &numsnaps);
+ dmu_objset_rele(os, FTAG);
+ if (error != 0)
+ return (error);
- mutex_enter(&ds->ds_dir->dd_lock);
- mutex_enter(&ds->ds_lock);
- ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
- unique = ds->ds_phys->ds_unique_bytes;
- delta = MAX(0, (int64_t)(effective_value - unique)) -
- MAX(0, (int64_t)(ds->ds_reserved - unique));
- ds->ds_reserved = effective_value;
- mutex_exit(&ds->ds_lock);
+ ddpa.ddpa_clonename = name;
+ ddpa.err_ds = conflsnap;
- dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx);
- mutex_exit(&ds->ds_dir->dd_lock);
+ return (dsl_sync_task(name, dsl_dataset_promote_check,
+ dsl_dataset_promote_sync, &ddpa, 2 + numsnaps));
}
int
-dsl_dataset_set_reservation(const char *dsname, zprop_source_t source,
- uint64_t reservation)
+dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
+ dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx)
{
- dsl_dataset_t *ds;
- dsl_prop_setarg_t psa;
- int err;
+ int64_t unused_refres_delta;
- dsl_prop_setarg_init_uint64(&psa, "refreservation", source,
- &reservation);
-
- err = dsl_dataset_hold(dsname, FTAG, &ds);
- if (err)
- return (err);
-
- err = dsl_sync_task_do(ds->ds_dir->dd_pool,
- dsl_dataset_set_reservation_check,
- dsl_dataset_set_reservation_sync, ds, &psa, 0);
+ /* they should both be heads */
+ if (dsl_dataset_is_snapshot(clone) ||
+ dsl_dataset_is_snapshot(origin_head))
+ return (SET_ERROR(EINVAL));
- dsl_dataset_rele(ds, FTAG);
- return (err);
-}
+ /* if we are not forcing, the branch point should be just before them */
+ if (!force && clone->ds_prev != origin_head->ds_prev)
+ return (SET_ERROR(EINVAL));
-typedef struct zfs_hold_cleanup_arg {
- dsl_pool_t *dp;
- uint64_t dsobj;
- char htag[MAXNAMELEN];
-} zfs_hold_cleanup_arg_t;
+ /* clone should be the clone (unless they are unrelated) */
+ if (clone->ds_prev != NULL &&
+ clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap &&
+ origin_head->ds_dir != clone->ds_prev->ds_dir)
+ return (SET_ERROR(EINVAL));
-static void
-dsl_dataset_user_release_onexit(void *arg)
-{
- zfs_hold_cleanup_arg_t *ca = arg;
+ /* the clone should be a child of the origin */
+ if (clone->ds_dir->dd_parent != origin_head->ds_dir)
+ return (SET_ERROR(EINVAL));
+
+ /* origin_head shouldn't be modified unless 'force' */
+ if (!force &&
+ dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev))
+ return (SET_ERROR(ETXTBSY));
+
+ /* origin_head should have no long holds (e.g. is not mounted) */
+ if (dsl_dataset_handoff_check(origin_head, owner, tx))
+ return (SET_ERROR(EBUSY));
+
+ /* check amount of any unconsumed refreservation */
+ unused_refres_delta =
+ (int64_t)MIN(origin_head->ds_reserved,
+ origin_head->ds_phys->ds_unique_bytes) -
+ (int64_t)MIN(origin_head->ds_reserved,
+ clone->ds_phys->ds_unique_bytes);
+
+ if (unused_refres_delta > 0 &&
+ unused_refres_delta >
+ dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE))
+ return (SET_ERROR(ENOSPC));
+
+ /* clone can't be over the head's refquota */
+ if (origin_head->ds_quota != 0 &&
+ clone->ds_phys->ds_referenced_bytes > origin_head->ds_quota)
+ return (SET_ERROR(EDQUOT));
- (void) dsl_dataset_user_release_tmp(ca->dp, ca->dsobj, ca->htag,
- B_TRUE);
- kmem_free(ca, sizeof (zfs_hold_cleanup_arg_t));
+ return (0);
}
void
-dsl_register_onexit_hold_cleanup(dsl_dataset_t *ds, const char *htag,
- minor_t minor)
+dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
+ dsl_dataset_t *origin_head, dmu_tx_t *tx)
{
- zfs_hold_cleanup_arg_t *ca;
-
- ca = kmem_alloc(sizeof (zfs_hold_cleanup_arg_t), KM_SLEEP);
- ca->dp = ds->ds_dir->dd_pool;
- ca->dsobj = ds->ds_object;
- (void) strlcpy(ca->htag, htag, sizeof (ca->htag));
- VERIFY3U(0, ==, zfs_onexit_add_cb(minor,
- dsl_dataset_user_release_onexit, ca, NULL));
-}
+ dsl_pool_t *dp = dmu_tx_pool(tx);
+ int64_t unused_refres_delta;
-/*
- * If you add new checks here, you may need to add
- * additional checks to the "temporary" case in
- * snapshot_check() in dmu_objset.c.
- */
-static int
-dsl_dataset_user_hold_check(void *arg1, void *arg2, dmu_tx_t *tx)
-{
- dsl_dataset_t *ds = arg1;
- struct dsl_ds_holdarg *ha = arg2;
- char *htag = ha->htag;
- objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
- int error = 0;
+ ASSERT(clone->ds_reserved == 0);
+ ASSERT(origin_head->ds_quota == 0 ||
+ clone->ds_phys->ds_unique_bytes <= origin_head->ds_quota);
+ ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev);
- if (spa_version(ds->ds_dir->dd_pool->dp_spa) < SPA_VERSION_USERREFS)
- return (ENOTSUP);
+ dmu_buf_will_dirty(clone->ds_dbuf, tx);
+ dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
- if (!dsl_dataset_is_snapshot(ds))
- return (EINVAL);
+ if (clone->ds_objset != NULL) {
+ dmu_objset_evict(clone->ds_objset);
+ clone->ds_objset = NULL;
+ }
- /* tags must be unique */
- mutex_enter(&ds->ds_lock);
- if (ds->ds_phys->ds_userrefs_obj) {
- error = zap_lookup(mos, ds->ds_phys->ds_userrefs_obj, htag,
- 8, 1, tx);
- if (error == 0)
- error = EEXIST;
- else if (error == ENOENT)
- error = 0;
+ if (origin_head->ds_objset != NULL) {
+ dmu_objset_evict(origin_head->ds_objset);
+ origin_head->ds_objset = NULL;
}
- mutex_exit(&ds->ds_lock);
- if (error == 0 && ha->temphold &&
- strlen(htag) + MAX_TAG_PREFIX_LEN >= MAXNAMELEN)
- error = E2BIG;
+ unused_refres_delta =
+ (int64_t)MIN(origin_head->ds_reserved,
+ origin_head->ds_phys->ds_unique_bytes) -
+ (int64_t)MIN(origin_head->ds_reserved,
+ clone->ds_phys->ds_unique_bytes);
- return (error);
-}
+ /*
+ * Reset origin's unique bytes, if it exists.
+ */
+ if (clone->ds_prev) {
+ dsl_dataset_t *origin = clone->ds_prev;
+ uint64_t comp, uncomp;
+
+ dmu_buf_will_dirty(origin->ds_dbuf, tx);
+ dsl_deadlist_space_range(&clone->ds_deadlist,
+ origin->ds_phys->ds_prev_snap_txg, UINT64_MAX,
+ &origin->ds_phys->ds_unique_bytes, &comp, &uncomp);
+ }
+
+ /* swap blkptrs */
+ {
+ blkptr_t tmp;
+ tmp = origin_head->ds_phys->ds_bp;
+ origin_head->ds_phys->ds_bp = clone->ds_phys->ds_bp;
+ clone->ds_phys->ds_bp = tmp;
+ }
+
+ /* set dd_*_bytes */
+ {
+ int64_t dused, dcomp, duncomp;
+ uint64_t cdl_used, cdl_comp, cdl_uncomp;
+ uint64_t odl_used, odl_comp, odl_uncomp;
+
+ ASSERT3U(clone->ds_dir->dd_phys->
+ dd_used_breakdown[DD_USED_SNAP], ==, 0);
+
+ dsl_deadlist_space(&clone->ds_deadlist,
+ &cdl_used, &cdl_comp, &cdl_uncomp);
+ dsl_deadlist_space(&origin_head->ds_deadlist,
+ &odl_used, &odl_comp, &odl_uncomp);
+
+ dused = clone->ds_phys->ds_referenced_bytes + cdl_used -
+ (origin_head->ds_phys->ds_referenced_bytes + odl_used);
+ dcomp = clone->ds_phys->ds_compressed_bytes + cdl_comp -
+ (origin_head->ds_phys->ds_compressed_bytes + odl_comp);
+ duncomp = clone->ds_phys->ds_uncompressed_bytes +
+ cdl_uncomp -
+ (origin_head->ds_phys->ds_uncompressed_bytes + odl_uncomp);
-void
-dsl_dataset_user_hold_sync(void *arg1, void *arg2, dmu_tx_t *tx)
-{
- dsl_dataset_t *ds = arg1;
- struct dsl_ds_holdarg *ha = arg2;
- char *htag = ha->htag;
- dsl_pool_t *dp = ds->ds_dir->dd_pool;
- objset_t *mos = dp->dp_meta_objset;
- uint64_t now = gethrestime_sec();
- uint64_t zapobj;
+ dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD,
+ dused, dcomp, duncomp, tx);
+ dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD,
+ -dused, -dcomp, -duncomp, tx);
- mutex_enter(&ds->ds_lock);
- if (ds->ds_phys->ds_userrefs_obj == 0) {
/*
- * This is the first user hold for this dataset. Create
- * the userrefs zap object.
+ * The difference in the space used by snapshots is the
+ * difference in snapshot space due to the head's
+ * deadlist (since that's the only thing that's
+ * changing that affects the snapused).
*/
- dmu_buf_will_dirty(ds->ds_dbuf, tx);
- zapobj = ds->ds_phys->ds_userrefs_obj =
- zap_create(mos, DMU_OT_USERREFS, DMU_OT_NONE, 0, tx);
- } else {
- zapobj = ds->ds_phys->ds_userrefs_obj;
+ dsl_deadlist_space_range(&clone->ds_deadlist,
+ origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
+ &cdl_used, &cdl_comp, &cdl_uncomp);
+ dsl_deadlist_space_range(&origin_head->ds_deadlist,
+ origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
+ &odl_used, &odl_comp, &odl_uncomp);
+ dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used,
+ DD_USED_HEAD, DD_USED_SNAP, tx);
}
- ds->ds_userrefs++;
- mutex_exit(&ds->ds_lock);
- VERIFY(0 == zap_add(mos, zapobj, htag, 8, 1, &now, tx));
+ /* swap ds_*_bytes */
+ SWITCH64(origin_head->ds_phys->ds_referenced_bytes,
+ clone->ds_phys->ds_referenced_bytes);
+ SWITCH64(origin_head->ds_phys->ds_compressed_bytes,
+ clone->ds_phys->ds_compressed_bytes);
+ SWITCH64(origin_head->ds_phys->ds_uncompressed_bytes,
+ clone->ds_phys->ds_uncompressed_bytes);
+ SWITCH64(origin_head->ds_phys->ds_unique_bytes,
+ clone->ds_phys->ds_unique_bytes);
- if (ha->temphold) {
- VERIFY(0 == dsl_pool_user_hold(dp, ds->ds_object,
- htag, &now, tx));
- }
+ /* apply any parent delta for change in unconsumed refreservation */
+ dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV,
+ unused_refres_delta, 0, 0, tx);
- spa_history_log_internal(LOG_DS_USER_HOLD,
- dp->dp_spa, tx, "<%s> temp = %d dataset = %llu", htag,
- (int)ha->temphold, ds->ds_object);
-}
+ /*
+ * Swap deadlists.
+ */
+ dsl_deadlist_close(&clone->ds_deadlist);
+ dsl_deadlist_close(&origin_head->ds_deadlist);
+ SWITCH64(origin_head->ds_phys->ds_deadlist_obj,
+ clone->ds_phys->ds_deadlist_obj);
+ dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset,
+ clone->ds_phys->ds_deadlist_obj);
+ dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset,
+ origin_head->ds_phys->ds_deadlist_obj);
-static int
-dsl_dataset_user_hold_one(const char *dsname, void *arg)
-{
- struct dsl_ds_holdarg *ha = arg;
- dsl_dataset_t *ds;
- int error;
- char *name;
+ dsl_scan_ds_clone_swapped(origin_head, clone, tx);
- /* alloc a buffer to hold dsname@snapname plus terminating NULL */
- name = kmem_asprintf("%s@%s", dsname, ha->snapname);
- error = dsl_dataset_hold(name, ha->dstg, &ds);
- strfree(name);
- if (error == 0) {
- ha->gotone = B_TRUE;
- dsl_sync_task_create(ha->dstg, dsl_dataset_user_hold_check,
- dsl_dataset_user_hold_sync, ds, ha, 0);
- } else if (error == ENOENT && ha->recursive) {
- error = 0;
- } else {
- (void) strlcpy(ha->failed, dsname, sizeof (ha->failed));
- }
- return (error);
+ spa_history_log_internal_ds(clone, "clone swap", tx,
+ "parent=%s", origin_head->ds_dir->dd_myname);
}
+/*
+ * Given a pool name and a dataset object number in that pool,
+ * return the name of that dataset.
+ */
int
-dsl_dataset_user_hold_for_send(dsl_dataset_t *ds, char *htag,
- boolean_t temphold)
+dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf)
{
- struct dsl_ds_holdarg *ha;
+ dsl_pool_t *dp;
+ dsl_dataset_t *ds;
int error;
- ha = kmem_zalloc(sizeof (struct dsl_ds_holdarg), KM_SLEEP);
- ha->htag = htag;
- ha->temphold = temphold;
- error = dsl_sync_task_do(ds->ds_dir->dd_pool,
- dsl_dataset_user_hold_check, dsl_dataset_user_hold_sync,
- ds, ha, 0);
- kmem_free(ha, sizeof (struct dsl_ds_holdarg));
+ error = dsl_pool_hold(pname, FTAG, &dp);
+ if (error != 0)
+ return (error);
+
+ error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
+ if (error == 0) {
+ dsl_dataset_name(ds, buf);
+ dsl_dataset_rele(ds, FTAG);
+ }
+ dsl_pool_rele(dp, FTAG);
return (error);
}
int
-dsl_dataset_user_hold(char *dsname, char *snapname, char *htag,
- boolean_t recursive, boolean_t temphold, int cleanup_fd)
+dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
+ uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv)
{
- struct dsl_ds_holdarg *ha;
- dsl_sync_task_t *dst;
- spa_t *spa;
- int error;
- minor_t minor = 0;
-
- if (cleanup_fd != -1) {
- /* Currently we only support cleanup-on-exit of tempholds. */
- if (!temphold)
- return (EINVAL);
- error = zfs_onexit_fd_hold(cleanup_fd, &minor);
- if (error)
- return (error);
- }
+ int error = 0;
- ha = kmem_zalloc(sizeof (struct dsl_ds_holdarg), KM_SLEEP);
+ ASSERT3S(asize, >, 0);
- (void) strlcpy(ha->failed, dsname, sizeof (ha->failed));
+ /*
+ * *ref_rsrv is the portion of asize that will come from any
+ * unconsumed refreservation space.
+ */
+ *ref_rsrv = 0;
- error = spa_open(dsname, &spa, FTAG);
- if (error) {
- kmem_free(ha, sizeof (struct dsl_ds_holdarg));
- if (cleanup_fd != -1)
- zfs_onexit_fd_rele(cleanup_fd);
- return (error);
+ mutex_enter(&ds->ds_lock);
+ /*
+ * Make a space adjustment for reserved bytes.
+ */
+ if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) {
+ ASSERT3U(*used, >=,
+ ds->ds_reserved - ds->ds_phys->ds_unique_bytes);
+ *used -= (ds->ds_reserved - ds->ds_phys->ds_unique_bytes);
+ *ref_rsrv =
+ asize - MIN(asize, parent_delta(ds, asize + inflight));
}
- ha->dstg = dsl_sync_task_group_create(spa_get_dsl(spa));
- ha->htag = htag;
- ha->snapname = snapname;
- ha->recursive = recursive;
- ha->temphold = temphold;
-
- if (recursive) {
- error = dmu_objset_find(dsname, dsl_dataset_user_hold_one,
- ha, DS_FIND_CHILDREN);
- } else {
- error = dsl_dataset_user_hold_one(dsname, ha);
+ if (!check_quota || ds->ds_quota == 0) {
+ mutex_exit(&ds->ds_lock);
+ return (0);
}
- if (error == 0)
- error = dsl_sync_task_group_wait(ha->dstg);
-
- for (dst = list_head(&ha->dstg->dstg_tasks); dst;
- dst = list_next(&ha->dstg->dstg_tasks, dst)) {
- dsl_dataset_t *ds = dst->dst_arg1;
-
- if (dst->dst_err) {
- dsl_dataset_name(ds, ha->failed);
- *strchr(ha->failed, '@') = '\0';
- } else if (error == 0 && minor != 0 && temphold) {
- /*
- * If this hold is to be released upon process exit,
- * register that action now.
- */
- dsl_register_onexit_hold_cleanup(ds, htag, minor);
- }
- dsl_dataset_rele(ds, ha->dstg);
+ /*
+ * 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 and there are no pending changes (which
+ * may free up space for us).
+ */
+ if (ds->ds_phys->ds_referenced_bytes + inflight >= ds->ds_quota) {
+ if (inflight > 0 ||
+ ds->ds_phys->ds_referenced_bytes < ds->ds_quota)
+ error = SET_ERROR(ERESTART);
+ else
+ error = SET_ERROR(EDQUOT);
}
+ mutex_exit(&ds->ds_lock);
- if (error == 0 && recursive && !ha->gotone)
- error = ENOENT;
-
- if (error)
- (void) strlcpy(dsname, ha->failed, sizeof (ha->failed));
-
- dsl_sync_task_group_destroy(ha->dstg);
-
- kmem_free(ha, sizeof (struct dsl_ds_holdarg));
- spa_close(spa, FTAG);
- if (cleanup_fd != -1)
- zfs_onexit_fd_rele(cleanup_fd);
return (error);
}
-struct dsl_ds_releasearg {
- dsl_dataset_t *ds;
- const char *htag;
- boolean_t own; /* do we own or just hold ds? */
-};
+typedef struct dsl_dataset_set_qr_arg {
+ const char *ddsqra_name;
+ zprop_source_t ddsqra_source;
+ uint64_t ddsqra_value;
+} dsl_dataset_set_qr_arg_t;
+
+/* ARGSUSED */
static int
-dsl_dataset_release_might_destroy(dsl_dataset_t *ds, const char *htag,
- boolean_t *might_destroy)
+dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx)
{
- objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
- uint64_t zapobj;
- uint64_t tmp;
+ dsl_dataset_set_qr_arg_t *ddsqra = arg;
+ dsl_pool_t *dp = dmu_tx_pool(tx);
+ dsl_dataset_t *ds;
int error;
+ uint64_t newval;
- *might_destroy = B_FALSE;
+ if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA)
+ return (SET_ERROR(ENOTSUP));
- mutex_enter(&ds->ds_lock);
- zapobj = ds->ds_phys->ds_userrefs_obj;
- if (zapobj == 0) {
- /* The tag can't possibly exist */
- mutex_exit(&ds->ds_lock);
- return (ESRCH);
+ error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
+ if (error != 0)
+ return (error);
+
+ if (dsl_dataset_is_snapshot(ds)) {
+ dsl_dataset_rele(ds, FTAG);
+ return (SET_ERROR(EINVAL));
}
- /* Make sure the tag exists */
- error = zap_lookup(mos, zapobj, htag, 8, 1, &tmp);
- if (error) {
- mutex_exit(&ds->ds_lock);
- if (error == ENOENT)
- error = ESRCH;
+ error = dsl_prop_predict(ds->ds_dir,
+ zfs_prop_to_name(ZFS_PROP_REFQUOTA),
+ ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
+ if (error != 0) {
+ dsl_dataset_rele(ds, FTAG);
return (error);
}
- if (ds->ds_userrefs == 1 && ds->ds_phys->ds_num_children == 1 &&
- DS_IS_DEFER_DESTROY(ds))
- *might_destroy = B_TRUE;
+ if (newval == 0) {
+ dsl_dataset_rele(ds, FTAG);
+ return (0);
+ }
- mutex_exit(&ds->ds_lock);
+ if (newval < ds->ds_phys->ds_referenced_bytes ||
+ newval < ds->ds_reserved) {
+ dsl_dataset_rele(ds, FTAG);
+ return (SET_ERROR(ENOSPC));
+ }
+
+ dsl_dataset_rele(ds, FTAG);
return (0);
}
-static int
-dsl_dataset_user_release_check(void *arg1, void *tag, dmu_tx_t *tx)
+static void
+dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx)
{
- struct dsl_ds_releasearg *ra = arg1;
- dsl_dataset_t *ds = ra->ds;
- boolean_t might_destroy;
- int error;
+ dsl_dataset_set_qr_arg_t *ddsqra = arg;
+ dsl_pool_t *dp = dmu_tx_pool(tx);
+ dsl_dataset_t *ds;
+ uint64_t newval;
- if (spa_version(ds->ds_dir->dd_pool->dp_spa) < SPA_VERSION_USERREFS)
- return (ENOTSUP);
+ VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
- error = dsl_dataset_release_might_destroy(ds, ra->htag, &might_destroy);
- if (error)
- return (error);
+ dsl_prop_set_sync_impl(ds,
+ zfs_prop_to_name(ZFS_PROP_REFQUOTA),
+ ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
+ &ddsqra->ddsqra_value, tx);
- if (might_destroy) {
- struct dsl_ds_destroyarg dsda = {0};
+ VERIFY0(dsl_prop_get_int_ds(ds,
+ zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval));
- if (dmu_tx_is_syncing(tx)) {
- /*
- * If we're not prepared to remove the snapshot,
- * we can't allow the release to happen right now.
- */
- if (!ra->own)
- return (EBUSY);
- }
- dsda.ds = ds;
- dsda.releasing = B_TRUE;
- return (dsl_dataset_destroy_check(&dsda, tag, tx));
+ if (ds->ds_quota != newval) {
+ dmu_buf_will_dirty(ds->ds_dbuf, tx);
+ ds->ds_quota = newval;
}
-
- return (0);
+ dsl_dataset_rele(ds, FTAG);
}
-static void
-dsl_dataset_user_release_sync(void *arg1, void *tag, dmu_tx_t *tx)
+int
+dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
+ uint64_t refquota)
{
- struct dsl_ds_releasearg *ra = arg1;
- dsl_dataset_t *ds = ra->ds;
- dsl_pool_t *dp = ds->ds_dir->dd_pool;
- objset_t *mos = dp->dp_meta_objset;
- uint64_t zapobj;
- uint64_t dsobj = ds->ds_object;
- uint64_t refs;
- int error;
+ dsl_dataset_set_qr_arg_t ddsqra;
- mutex_enter(&ds->ds_lock);
- ds->ds_userrefs--;
- refs = ds->ds_userrefs;
- mutex_exit(&ds->ds_lock);
- error = dsl_pool_user_release(dp, ds->ds_object, ra->htag, tx);
- VERIFY(error == 0 || error == ENOENT);
- zapobj = ds->ds_phys->ds_userrefs_obj;
- VERIFY(0 == zap_remove(mos, zapobj, ra->htag, tx));
-
- spa_history_log_internal(LOG_DS_USER_RELEASE,
- dp->dp_spa, tx, "<%s> %lld dataset = %llu",
- ra->htag, (longlong_t)refs, dsobj);
-
- if (ds->ds_userrefs == 0 && ds->ds_phys->ds_num_children == 1 &&
- DS_IS_DEFER_DESTROY(ds)) {
- struct dsl_ds_destroyarg dsda = {0};
-
- ASSERT(ra->own);
- dsda.ds = ds;
- dsda.releasing = B_TRUE;
- /* We already did the destroy_check */
- dsl_dataset_destroy_sync(&dsda, tag, tx);
- }
+ ddsqra.ddsqra_name = dsname;
+ ddsqra.ddsqra_source = source;
+ ddsqra.ddsqra_value = refquota;
+
+ return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check,
+ dsl_dataset_set_refquota_sync, &ddsqra, 0));
}
static int
-dsl_dataset_user_release_one(const char *dsname, void *arg)
+dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx)
{
- struct dsl_ds_holdarg *ha = arg;
- struct dsl_ds_releasearg *ra;
+ dsl_dataset_set_qr_arg_t *ddsqra = arg;
+ dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *ds;
int error;
- void *dtag = ha->dstg;
- char *name;
- boolean_t own = B_FALSE;
- boolean_t might_destroy;
-
- /* alloc a buffer to hold dsname@snapname, plus the terminating NULL */
- name = kmem_asprintf("%s@%s", dsname, ha->snapname);
- error = dsl_dataset_hold(name, dtag, &ds);
- strfree(name);
- if (error == ENOENT && ha->recursive)
- return (0);
- (void) strlcpy(ha->failed, dsname, sizeof (ha->failed));
- if (error)
- return (error);
-
- ha->gotone = B_TRUE;
+ uint64_t newval, unique;
- ASSERT(dsl_dataset_is_snapshot(ds));
+ if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION)
+ return (SET_ERROR(ENOTSUP));
- error = dsl_dataset_release_might_destroy(ds, ha->htag, &might_destroy);
- if (error) {
- dsl_dataset_rele(ds, dtag);
+ error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
+ if (error != 0)
return (error);
- }
- if (might_destroy) {
-#ifdef _KERNEL
- name = kmem_asprintf("%s@%s", dsname, ha->snapname);
- error = zfs_unmount_snap(name, NULL);
- strfree(name);
- if (error) {
- dsl_dataset_rele(ds, dtag);
- return (error);
- }
-#endif
- if (!dsl_dataset_tryown(ds, B_TRUE, dtag)) {
- dsl_dataset_rele(ds, dtag);
- return (EBUSY);
- } else {
- own = B_TRUE;
- dsl_dataset_make_exclusive(ds, dtag);
- }
+ if (dsl_dataset_is_snapshot(ds)) {
+ dsl_dataset_rele(ds, FTAG);
+ return (SET_ERROR(EINVAL));
}
- ra = kmem_alloc(sizeof (struct dsl_ds_releasearg), KM_SLEEP);
- ra->ds = ds;
- ra->htag = ha->htag;
- ra->own = own;
- dsl_sync_task_create(ha->dstg, dsl_dataset_user_release_check,
- dsl_dataset_user_release_sync, ra, dtag, 0);
-
- return (0);
-}
-
-int
-dsl_dataset_user_release(char *dsname, char *snapname, char *htag,
- boolean_t recursive)
-{
- struct dsl_ds_holdarg *ha;
- dsl_sync_task_t *dst;
- spa_t *spa;
- int error;
-
-top:
- ha = kmem_zalloc(sizeof (struct dsl_ds_holdarg), KM_SLEEP);
-
- (void) strlcpy(ha->failed, dsname, sizeof (ha->failed));
-
- error = spa_open(dsname, &spa, FTAG);
- if (error) {
- kmem_free(ha, sizeof (struct dsl_ds_holdarg));
+ error = dsl_prop_predict(ds->ds_dir,
+ zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
+ ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
+ if (error != 0) {
+ dsl_dataset_rele(ds, FTAG);
return (error);
}
- ha->dstg = dsl_sync_task_group_create(spa_get_dsl(spa));
- ha->htag = htag;
- ha->snapname = snapname;
- ha->recursive = recursive;
- if (recursive) {
- error = dmu_objset_find(dsname, dsl_dataset_user_release_one,
- ha, DS_FIND_CHILDREN);
- } else {
- error = dsl_dataset_user_release_one(dsname, ha);
+ /*
+ * If we are doing the preliminary check in open context, the
+ * space estimates may be inaccurate.
+ */
+ if (!dmu_tx_is_syncing(tx)) {
+ dsl_dataset_rele(ds, FTAG);
+ return (0);
}
- if (error == 0)
- error = dsl_sync_task_group_wait(ha->dstg);
-
- for (dst = list_head(&ha->dstg->dstg_tasks); dst;
- dst = list_next(&ha->dstg->dstg_tasks, dst)) {
- struct dsl_ds_releasearg *ra = dst->dst_arg1;
- dsl_dataset_t *ds = ra->ds;
- if (dst->dst_err)
- dsl_dataset_name(ds, ha->failed);
+ mutex_enter(&ds->ds_lock);
+ if (!DS_UNIQUE_IS_ACCURATE(ds))
+ dsl_dataset_recalc_head_uniq(ds);
+ unique = ds->ds_phys->ds_unique_bytes;
+ mutex_exit(&ds->ds_lock);
- if (ra->own)
- dsl_dataset_disown(ds, ha->dstg);
- else
- dsl_dataset_rele(ds, ha->dstg);
+ if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) {
+ uint64_t delta = MAX(unique, newval) -
+ MAX(unique, ds->ds_reserved);
- kmem_free(ra, sizeof (struct dsl_ds_releasearg));
+ if (delta >
+ dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) ||
+ (ds->ds_quota > 0 && newval > ds->ds_quota)) {
+ dsl_dataset_rele(ds, FTAG);
+ return (SET_ERROR(ENOSPC));
+ }
}
- if (error == 0 && recursive && !ha->gotone)
- error = ENOENT;
-
- if (error && error != EBUSY)
- (void) strlcpy(dsname, ha->failed, sizeof (ha->failed));
-
- dsl_sync_task_group_destroy(ha->dstg);
- kmem_free(ha, sizeof (struct dsl_ds_holdarg));
- spa_close(spa, FTAG);
-
- /*
- * We can get EBUSY if we were racing with deferred destroy and
- * dsl_dataset_user_release_check() hadn't done the necessary
- * open context setup. We can also get EBUSY if we're racing
- * with destroy and that thread is the ds_owner. Either way
- * the busy condition should be transient, and we should retry
- * the release operation.
- */
- if (error == EBUSY)
- goto top;
-
- return (error);
+ dsl_dataset_rele(ds, FTAG);
+ return (0);
}
-/*
- * Called at spa_load time (with retry == B_FALSE) to release a stale
- * temporary user hold. Also called by the onexit code (with retry == B_TRUE).
- */
-int
-dsl_dataset_user_release_tmp(dsl_pool_t *dp, uint64_t dsobj, char *htag,
- boolean_t retry)
+void
+dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
+ zprop_source_t source, uint64_t value, dmu_tx_t *tx)
{
- dsl_dataset_t *ds;
- char *snap;
- char *name;
- int namelen;
- int error;
+ uint64_t newval;
+ uint64_t unique;
+ int64_t delta;
- do {
- rw_enter(&dp->dp_config_rwlock, RW_READER);
- error = dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds);
- rw_exit(&dp->dp_config_rwlock);
- if (error)
- return (error);
- namelen = dsl_dataset_namelen(ds)+1;
- name = kmem_alloc(namelen, KM_SLEEP);
- dsl_dataset_name(ds, name);
- dsl_dataset_rele(ds, FTAG);
+ dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
+ source, sizeof (value), 1, &value, tx);
- snap = strchr(name, '@');
- *snap = '\0';
- ++snap;
- error = dsl_dataset_user_release(name, snap, htag, B_FALSE);
- kmem_free(name, namelen);
+ VERIFY0(dsl_prop_get_int_ds(ds,
+ zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval));
- /*
- * The object can't have been destroyed because we have a hold,
- * but it might have been renamed, resulting in ENOENT. Retry
- * if we've been requested to do so.
- *
- * It would be nice if we could use the dsobj all the way
- * through and avoid ENOENT entirely. But we might need to
- * unmount the snapshot, and there's currently no way to lookup
- * a vfsp using a ZFS object id.
- */
- } while ((error == ENOENT) && retry);
+ dmu_buf_will_dirty(ds->ds_dbuf, tx);
+ mutex_enter(&ds->ds_dir->dd_lock);
+ mutex_enter(&ds->ds_lock);
+ ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
+ unique = ds->ds_phys->ds_unique_bytes;
+ delta = MAX(0, (int64_t)(newval - unique)) -
+ MAX(0, (int64_t)(ds->ds_reserved - unique));
+ ds->ds_reserved = newval;
+ mutex_exit(&ds->ds_lock);
- return (error);
+ dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx);
+ mutex_exit(&ds->ds_dir->dd_lock);
}
-int
-dsl_dataset_get_holds(const char *dsname, nvlist_t **nvp)
+static void
+dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx)
{
+ dsl_dataset_set_qr_arg_t *ddsqra = arg;
+ dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *ds;
- int err;
-
- err = dsl_dataset_hold(dsname, FTAG, &ds);
- if (err)
- return (err);
- VERIFY(0 == nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP));
- if (ds->ds_phys->ds_userrefs_obj != 0) {
- zap_attribute_t *za;
- zap_cursor_t zc;
-
- za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
- for (zap_cursor_init(&zc, ds->ds_dir->dd_pool->dp_meta_objset,
- ds->ds_phys->ds_userrefs_obj);
- zap_cursor_retrieve(&zc, za) == 0;
- zap_cursor_advance(&zc)) {
- VERIFY(0 == nvlist_add_uint64(*nvp, za->za_name,
- za->za_first_integer));
- }
- zap_cursor_fini(&zc);
- kmem_free(za, sizeof (zap_attribute_t));
- }
+ VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
+ dsl_dataset_set_refreservation_sync_impl(ds,
+ ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx);
dsl_dataset_rele(ds, FTAG);
- return (0);
}
-/*
- * Note, this function is used as the callback for dmu_objset_find(). We
- * always return 0 so that we will continue to find and process
- * inconsistent datasets, even if we encounter an error trying to
- * process one of them.
- */
-/* ARGSUSED */
int
-dsl_destroy_inconsistent(const char *dsname, void *arg)
+dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
+ uint64_t refreservation)
{
- dsl_dataset_t *ds;
+ dsl_dataset_set_qr_arg_t ddsqra;
- if (dsl_dataset_own(dsname, B_TRUE, FTAG, &ds) == 0) {
- if (DS_IS_INCONSISTENT(ds))
- (void) dsl_dataset_destroy(ds, FTAG, B_FALSE);
- else
- dsl_dataset_disown(ds, FTAG);
- }
- return (0);
-}
+ ddsqra.ddsqra_name = dsname;
+ ddsqra.ddsqra_source = source;
+ ddsqra.ddsqra_value = refreservation;
+ return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check,
+ dsl_dataset_set_refreservation_sync, &ddsqra, 0));
+}
/*
* Return (in *usedp) the amount of space written in new that is not
uint64_t snapobj;
dsl_pool_t *dp = new->ds_dir->dd_pool;
+ ASSERT(dsl_pool_config_held(dp));
+
*usedp = 0;
*usedp += new->ds_phys->ds_referenced_bytes;
*usedp -= oldsnap->ds_phys->ds_referenced_bytes;
*uncompp += new->ds_phys->ds_uncompressed_bytes;
*uncompp -= oldsnap->ds_phys->ds_uncompressed_bytes;
- rw_enter(&dp->dp_config_rwlock, RW_READER);
snapobj = new->ds_object;
while (snapobj != oldsnap->ds_object) {
dsl_dataset_t *snap;
if (snap != new)
dsl_dataset_rele(snap, FTAG);
if (snapobj == 0) {
- err = EINVAL;
+ err = SET_ERROR(EINVAL);
break;
}
}
- rw_exit(&dp->dp_config_rwlock);
return (err);
}
if (firstsnap->ds_dir != lastsnap->ds_dir ||
firstsnap->ds_phys->ds_creation_txg >
lastsnap->ds_phys->ds_creation_txg)
- return (EINVAL);
+ return (SET_ERROR(EINVAL));
*usedp = *compp = *uncompp = 0;
- rw_enter(&dp->dp_config_rwlock, RW_READER);
snapobj = lastsnap->ds_phys->ds_next_snap_obj;
while (snapobj != firstsnap->ds_object) {
dsl_dataset_t *ds;
ASSERT3U(snapobj, !=, 0);
dsl_dataset_rele(ds, FTAG);
}
- rw_exit(&dp->dp_config_rwlock);
return (err);
}
+/*
+ * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
+ * For example, they could both be snapshots of the same filesystem, and
+ * 'earlier' is before 'later'. Or 'earlier' could be the origin of
+ * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
+ * filesystem. Or 'earlier' could be the origin's origin.
+ *
+ * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
+ */
+boolean_t
+dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier,
+ uint64_t earlier_txg)
+{
+ dsl_pool_t *dp = later->ds_dir->dd_pool;
+ int error;
+ boolean_t ret;
+ dsl_dataset_t *origin;
+
+ ASSERT(dsl_pool_config_held(dp));
+ ASSERT(dsl_dataset_is_snapshot(earlier) || earlier_txg != 0);
+
+ if (earlier_txg == 0)
+ earlier_txg = earlier->ds_phys->ds_creation_txg;
+
+ if (dsl_dataset_is_snapshot(later) &&
+ earlier_txg >= later->ds_phys->ds_creation_txg)
+ return (B_FALSE);
+
+ if (later->ds_dir == earlier->ds_dir)
+ return (B_TRUE);
+ if (!dsl_dir_is_clone(later->ds_dir))
+ return (B_FALSE);
+
+ if (later->ds_dir->dd_phys->dd_origin_obj == earlier->ds_object)
+ return (B_TRUE);
+ error = dsl_dataset_hold_obj(dp,
+ later->ds_dir->dd_phys->dd_origin_obj, FTAG, &origin);
+ if (error != 0)
+ return (B_FALSE);
+ ret = dsl_dataset_is_before(origin, earlier, earlier_txg);
+ dsl_dataset_rele(origin, FTAG);
+ return (ret);
+}
+
+
+void
+dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx)
+{
+ objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
+ dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx);
+}
+
#if defined(_KERNEL) && defined(HAVE_SPL)
-EXPORT_SYMBOL(dmu_snapshots_destroy_nvl);
EXPORT_SYMBOL(dsl_dataset_hold);
EXPORT_SYMBOL(dsl_dataset_hold_obj);
EXPORT_SYMBOL(dsl_dataset_own);
EXPORT_SYMBOL(dsl_dataset_name);
EXPORT_SYMBOL(dsl_dataset_rele);
EXPORT_SYMBOL(dsl_dataset_disown);
-EXPORT_SYMBOL(dsl_dataset_drop_ref);
EXPORT_SYMBOL(dsl_dataset_tryown);
-EXPORT_SYMBOL(dsl_dataset_make_exclusive);
EXPORT_SYMBOL(dsl_dataset_create_sync);
EXPORT_SYMBOL(dsl_dataset_create_sync_dd);
-EXPORT_SYMBOL(dsl_dataset_destroy);
-EXPORT_SYMBOL(dsl_dataset_destroy_check);
-EXPORT_SYMBOL(dsl_dataset_destroy_sync);
EXPORT_SYMBOL(dsl_dataset_snapshot_check);
EXPORT_SYMBOL(dsl_dataset_snapshot_sync);
-EXPORT_SYMBOL(dsl_dataset_rename);
EXPORT_SYMBOL(dsl_dataset_promote);
-EXPORT_SYMBOL(dsl_dataset_clone_swap);
EXPORT_SYMBOL(dsl_dataset_user_hold);
EXPORT_SYMBOL(dsl_dataset_user_release);
-EXPORT_SYMBOL(dsl_dataset_user_release_tmp);
EXPORT_SYMBOL(dsl_dataset_get_holds);
EXPORT_SYMBOL(dsl_dataset_get_blkptr);
EXPORT_SYMBOL(dsl_dataset_set_blkptr);
EXPORT_SYMBOL(dsl_dataset_get_spa);
-EXPORT_SYMBOL(dsl_dataset_modified_since_lastsnap);
+EXPORT_SYMBOL(dsl_dataset_modified_since_snap);
EXPORT_SYMBOL(dsl_dataset_space_written);
EXPORT_SYMBOL(dsl_dataset_space_wouldfree);
EXPORT_SYMBOL(dsl_dataset_sync);
EXPORT_SYMBOL(dsl_dataset_fsid_guid);
EXPORT_SYMBOL(dsl_dsobj_to_dsname);
EXPORT_SYMBOL(dsl_dataset_check_quota);
-EXPORT_SYMBOL(dsl_dataset_set_quota);
-EXPORT_SYMBOL(dsl_dataset_set_quota_sync);
-EXPORT_SYMBOL(dsl_dataset_set_reservation);
-EXPORT_SYMBOL(dsl_destroy_inconsistent);
+EXPORT_SYMBOL(dsl_dataset_clone_swap_check_impl);
+EXPORT_SYMBOL(dsl_dataset_clone_swap_sync_impl);
#endif
projects / mirror_zfs-debian.git / blobdiff