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-rw-r--r--module/zfs/dsl_dir.c591
1 files changed, 588 insertions, 3 deletions
diff --git a/module/zfs/dsl_dir.c b/module/zfs/dsl_dir.c
index b94b68e15..86b40657c 100644
--- a/module/zfs/dsl_dir.c
+++ b/module/zfs/dsl_dir.c
@@ -22,6 +22,7 @@
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2013 by Delphix. All rights reserved.
* Copyright (c) 2013 Martin Matuska. All rights reserved.
+ * Copyright (c) 2014 Joyent, Inc. All rights reserved.
*/
#include <sys/dmu.h>
@@ -39,8 +40,87 @@
#include <sys/zio.h>
#include <sys/arc.h>
#include <sys/sunddi.h>
+#include <sys/zfeature.h>
+#include <sys/policy.h>
+#include <sys/zfs_znode.h>
#include <sys/zvol.h>
#include "zfs_namecheck.h"
+#include "zfs_prop.h"
+
+/*
+ * Filesystem and Snapshot Limits
+ * ------------------------------
+ *
+ * These limits are used to restrict the number of filesystems and/or snapshots
+ * that can be created at a given level in the tree or below. A typical
+ * use-case is with a delegated dataset where the administrator wants to ensure
+ * that a user within the zone is not creating too many additional filesystems
+ * or snapshots, even though they're not exceeding their space quota.
+ *
+ * The filesystem and snapshot counts are stored as extensible properties. This
+ * capability is controlled by a feature flag and must be enabled to be used.
+ * Once enabled, the feature is not active until the first limit is set. At
+ * that point, future operations to create/destroy filesystems or snapshots
+ * will validate and update the counts.
+ *
+ * Because the count properties will not exist before the feature is active,
+ * the counts are updated when a limit is first set on an uninitialized
+ * dsl_dir node in the tree (The filesystem/snapshot count on a node includes
+ * all of the nested filesystems/snapshots. Thus, a new leaf node has a
+ * filesystem count of 0 and a snapshot count of 0. Non-existent filesystem and
+ * snapshot count properties on a node indicate uninitialized counts on that
+ * node.) When first setting a limit on an uninitialized node, the code starts
+ * at the filesystem with the new limit and descends into all sub-filesystems
+ * to add the count properties.
+ *
+ * In practice this is lightweight since a limit is typically set when the
+ * filesystem is created and thus has no children. Once valid, changing the
+ * limit value won't require a re-traversal since the counts are already valid.
+ * When recursively fixing the counts, if a node with a limit is encountered
+ * during the descent, the counts are known to be valid and there is no need to
+ * descend into that filesystem's children. The counts on filesystems above the
+ * one with the new limit will still be uninitialized, unless a limit is
+ * eventually set on one of those filesystems. The counts are always recursively
+ * updated when a limit is set on a dataset, unless there is already a limit.
+ * When a new limit value is set on a filesystem with an existing limit, it is
+ * possible for the new limit to be less than the current count at that level
+ * since a user who can change the limit is also allowed to exceed the limit.
+ *
+ * Once the feature is active, then whenever a filesystem or snapshot is
+ * created, the code recurses up the tree, validating the new count against the
+ * limit at each initialized level. In practice, most levels will not have a
+ * limit set. If there is a limit at any initialized level up the tree, the
+ * check must pass or the creation will fail. Likewise, when a filesystem or
+ * snapshot is destroyed, the counts are recursively adjusted all the way up
+ * the initizized nodes in the tree. Renaming a filesystem into different point
+ * in the tree will first validate, then update the counts on each branch up to
+ * the common ancestor. A receive will also validate the counts and then update
+ * them.
+ *
+ * An exception to the above behavior is that the limit is not enforced if the
+ * user has permission to modify the limit. This is primarily so that
+ * recursive snapshots in the global zone always work. We want to prevent a
+ * denial-of-service in which a lower level delegated dataset could max out its
+ * limit and thus block recursive snapshots from being taken in the global zone.
+ * Because of this, it is possible for the snapshot count to be over the limit
+ * and snapshots taken in the global zone could cause a lower level dataset to
+ * hit or exceed its limit. The administrator taking the global zone recursive
+ * snapshot should be aware of this side-effect and behave accordingly.
+ * For consistency, the filesystem limit is also not enforced if the user can
+ * modify the limit.
+ *
+ * The filesystem and snapshot limits are validated by dsl_fs_ss_limit_check()
+ * and updated by dsl_fs_ss_count_adjust(). A new limit value is setup in
+ * dsl_dir_activate_fs_ss_limit() and the counts are adjusted, if necessary, by
+ * dsl_dir_init_fs_ss_count().
+ *
+ * There is a special case when we receive a filesystem that already exists. In
+ * this case a temporary clone name of %X is created (see dmu_recv_begin). We
+ * never update the filesystem counts for temporary clones.
+ *
+ * Likewise, we do not update the snapshot counts for temporary snapshots,
+ * such as those created by zfs diff.
+ */
static uint64_t dsl_dir_space_towrite(dsl_dir_t *dd);
@@ -384,6 +464,398 @@ error:
return (err);
}
+/*
+ * If the counts are already initialized for this filesystem and its
+ * descendants then do nothing, otherwise initialize the counts.
+ *
+ * The counts on this filesystem, and those below, may be uninitialized due to
+ * either the use of a pre-existing pool which did not support the
+ * filesystem/snapshot limit feature, or one in which the feature had not yet
+ * been enabled.
+ *
+ * Recursively descend the filesystem tree and update the filesystem/snapshot
+ * counts on each filesystem below, then update the cumulative count on the
+ * current filesystem. If the filesystem already has a count set on it,
+ * then we know that its counts, and the counts on the filesystems below it,
+ * are already correct, so we don't have to update this filesystem.
+ */
+static void
+dsl_dir_init_fs_ss_count(dsl_dir_t *dd, dmu_tx_t *tx)
+{
+ uint64_t my_fs_cnt = 0;
+ uint64_t my_ss_cnt = 0;
+ dsl_pool_t *dp = dd->dd_pool;
+ objset_t *os = dp->dp_meta_objset;
+ zap_cursor_t *zc;
+ zap_attribute_t *za;
+ dsl_dataset_t *ds;
+
+ ASSERT(spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT));
+ ASSERT(dsl_pool_config_held(dp));
+ ASSERT(dmu_tx_is_syncing(tx));
+
+ dsl_dir_zapify(dd, tx);
+
+ /*
+ * If the filesystem count has already been initialized then we
+ * don't need to recurse down any further.
+ */
+ if (zap_contains(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT) == 0)
+ return;
+
+ zc = kmem_alloc(sizeof (zap_cursor_t), KM_SLEEP);
+ za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
+
+ /* Iterate my child dirs */
+ for (zap_cursor_init(zc, os, dd->dd_phys->dd_child_dir_zapobj);
+ zap_cursor_retrieve(zc, za) == 0; zap_cursor_advance(zc)) {
+ dsl_dir_t *chld_dd;
+ uint64_t count;
+
+ VERIFY0(dsl_dir_hold_obj(dp, za->za_first_integer, NULL, FTAG,
+ &chld_dd));
+
+ /*
+ * Ignore hidden ($FREE, $MOS & $ORIGIN) objsets and
+ * temporary datasets.
+ */
+ if (chld_dd->dd_myname[0] == '$' ||
+ chld_dd->dd_myname[0] == '%') {
+ dsl_dir_rele(chld_dd, FTAG);
+ continue;
+ }
+
+ my_fs_cnt++; /* count this child */
+
+ dsl_dir_init_fs_ss_count(chld_dd, tx);
+
+ VERIFY0(zap_lookup(os, chld_dd->dd_object,
+ DD_FIELD_FILESYSTEM_COUNT, sizeof (count), 1, &count));
+ my_fs_cnt += count;
+ VERIFY0(zap_lookup(os, chld_dd->dd_object,
+ DD_FIELD_SNAPSHOT_COUNT, sizeof (count), 1, &count));
+ my_ss_cnt += count;
+
+ dsl_dir_rele(chld_dd, FTAG);
+ }
+ zap_cursor_fini(zc);
+ /* Count my snapshots (we counted children's snapshots above) */
+ VERIFY0(dsl_dataset_hold_obj(dd->dd_pool,
+ dd->dd_phys->dd_head_dataset_obj, FTAG, &ds));
+
+ for (zap_cursor_init(zc, os, ds->ds_phys->ds_snapnames_zapobj);
+ zap_cursor_retrieve(zc, za) == 0;
+ zap_cursor_advance(zc)) {
+ /* Don't count temporary snapshots */
+ if (za->za_name[0] != '%')
+ my_ss_cnt++;
+ }
+
+ dsl_dataset_rele(ds, FTAG);
+
+ kmem_free(zc, sizeof (zap_cursor_t));
+ kmem_free(za, sizeof (zap_attribute_t));
+
+ /* we're in a sync task, update counts */
+ dmu_buf_will_dirty(dd->dd_dbuf, tx);
+ VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
+ sizeof (my_fs_cnt), 1, &my_fs_cnt, tx));
+ VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
+ sizeof (my_ss_cnt), 1, &my_ss_cnt, tx));
+}
+
+static int
+dsl_dir_actv_fs_ss_limit_check(void *arg, dmu_tx_t *tx)
+{
+ char *ddname = (char *)arg;
+ dsl_pool_t *dp = dmu_tx_pool(tx);
+ dsl_dataset_t *ds;
+ dsl_dir_t *dd;
+ int error;
+
+ error = dsl_dataset_hold(dp, ddname, FTAG, &ds);
+ if (error != 0)
+ return (error);
+
+ if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) {
+ dsl_dataset_rele(ds, FTAG);
+ return (SET_ERROR(ENOTSUP));
+ }
+
+ dd = ds->ds_dir;
+ if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT) &&
+ dsl_dir_is_zapified(dd) &&
+ zap_contains(dp->dp_meta_objset, dd->dd_object,
+ DD_FIELD_FILESYSTEM_COUNT) == 0) {
+ dsl_dataset_rele(ds, FTAG);
+ return (SET_ERROR(EALREADY));
+ }
+
+ dsl_dataset_rele(ds, FTAG);
+ return (0);
+}
+
+static void
+dsl_dir_actv_fs_ss_limit_sync(void *arg, dmu_tx_t *tx)
+{
+ char *ddname = (char *)arg;
+ dsl_pool_t *dp = dmu_tx_pool(tx);
+ dsl_dataset_t *ds;
+ spa_t *spa;
+
+ VERIFY0(dsl_dataset_hold(dp, ddname, FTAG, &ds));
+
+ spa = dsl_dataset_get_spa(ds);
+
+ if (!spa_feature_is_active(spa, SPA_FEATURE_FS_SS_LIMIT)) {
+ /*
+ * Since the feature was not active and we're now setting a
+ * limit, increment the feature-active counter so that the
+ * feature becomes active for the first time.
+ *
+ * We are already in a sync task so we can update the MOS.
+ */
+ spa_feature_incr(spa, SPA_FEATURE_FS_SS_LIMIT, tx);
+ }
+
+ /*
+ * Since we are now setting a non-UINT64_MAX limit on the filesystem,
+ * we need to ensure the counts are correct. Descend down the tree from
+ * this point and update all of the counts to be accurate.
+ */
+ dsl_dir_init_fs_ss_count(ds->ds_dir, tx);
+
+ dsl_dataset_rele(ds, FTAG);
+}
+
+/*
+ * Make sure the feature is enabled and activate it if necessary.
+ * Since we're setting a limit, ensure the on-disk counts are valid.
+ * This is only called by the ioctl path when setting a limit value.
+ *
+ * We do not need to validate the new limit, since users who can change the
+ * limit are also allowed to exceed the limit.
+ */
+int
+dsl_dir_activate_fs_ss_limit(const char *ddname)
+{
+ int error;
+
+ error = dsl_sync_task(ddname, dsl_dir_actv_fs_ss_limit_check,
+ dsl_dir_actv_fs_ss_limit_sync, (void *)ddname, 0);
+
+ if (error == EALREADY)
+ error = 0;
+
+ return (error);
+}
+
+/*
+ * Used to determine if the filesystem_limit or snapshot_limit should be
+ * enforced. We allow the limit to be exceeded if the user has permission to
+ * write the property value. We pass in the creds that we got in the open
+ * context since we will always be the GZ root in syncing context. We also have
+ * to handle the case where we are allowed to change the limit on the current
+ * dataset, but there may be another limit in the tree above.
+ *
+ * We can never modify these two properties within a non-global zone. In
+ * addition, the other checks are modeled on zfs_secpolicy_write_perms. We
+ * can't use that function since we are already holding the dp_config_rwlock.
+ * In addition, we already have the dd and dealing with snapshots is simplified
+ * in this code.
+ */
+
+typedef enum {
+ ENFORCE_ALWAYS,
+ ENFORCE_NEVER,
+ ENFORCE_ABOVE
+} enforce_res_t;
+
+static enforce_res_t
+dsl_enforce_ds_ss_limits(dsl_dir_t *dd, zfs_prop_t prop, cred_t *cr)
+{
+ enforce_res_t enforce = ENFORCE_ALWAYS;
+ uint64_t obj;
+ dsl_dataset_t *ds;
+ uint64_t zoned;
+
+ ASSERT(prop == ZFS_PROP_FILESYSTEM_LIMIT ||
+ prop == ZFS_PROP_SNAPSHOT_LIMIT);
+
+#ifdef _KERNEL
+ if (crgetzoneid(cr) != GLOBAL_ZONEID)
+ return (ENFORCE_ALWAYS);
+
+ if (secpolicy_zfs(cr) == 0)
+ return (ENFORCE_NEVER);
+#endif
+
+ if ((obj = dd->dd_phys->dd_head_dataset_obj) == 0)
+ return (ENFORCE_ALWAYS);
+
+ ASSERT(dsl_pool_config_held(dd->dd_pool));
+
+ if (dsl_dataset_hold_obj(dd->dd_pool, obj, FTAG, &ds) != 0)
+ return (ENFORCE_ALWAYS);
+
+ if (dsl_prop_get_ds(ds, "zoned", 8, 1, &zoned, NULL) || zoned) {
+ /* Only root can access zoned fs's from the GZ */
+ enforce = ENFORCE_ALWAYS;
+ } else {
+ if (dsl_deleg_access_impl(ds, zfs_prop_to_name(prop), cr) == 0)
+ enforce = ENFORCE_ABOVE;
+ }
+
+ dsl_dataset_rele(ds, FTAG);
+ return (enforce);
+}
+
+/*
+ * Check if adding additional child filesystem(s) would exceed any filesystem
+ * limits or adding additional snapshot(s) would exceed any snapshot limits.
+ * The prop argument indicates which limit to check.
+ *
+ * Note that all filesystem limits up to the root (or the highest
+ * initialized) filesystem or the given ancestor must be satisfied.
+ */
+int
+dsl_fs_ss_limit_check(dsl_dir_t *dd, uint64_t delta, zfs_prop_t prop,
+ dsl_dir_t *ancestor, cred_t *cr)
+{
+ objset_t *os = dd->dd_pool->dp_meta_objset;
+ uint64_t limit, count;
+ char *count_prop;
+ enforce_res_t enforce;
+ int err = 0;
+
+ ASSERT(dsl_pool_config_held(dd->dd_pool));
+ ASSERT(prop == ZFS_PROP_FILESYSTEM_LIMIT ||
+ prop == ZFS_PROP_SNAPSHOT_LIMIT);
+
+ /*
+ * If we're allowed to change the limit, don't enforce the limit
+ * e.g. this can happen if a snapshot is taken by an administrative
+ * user in the global zone (i.e. a recursive snapshot by root).
+ * However, we must handle the case of delegated permissions where we
+ * are allowed to change the limit on the current dataset, but there
+ * is another limit in the tree above.
+ */
+ enforce = dsl_enforce_ds_ss_limits(dd, prop, cr);
+ if (enforce == ENFORCE_NEVER)
+ return (0);
+
+ /*
+ * e.g. if renaming a dataset with no snapshots, count adjustment
+ * is 0.
+ */
+ if (delta == 0)
+ return (0);
+
+ if (prop == ZFS_PROP_SNAPSHOT_LIMIT) {
+ /*
+ * We don't enforce the limit for temporary snapshots. This is
+ * indicated by a NULL cred_t argument.
+ */
+ if (cr == NULL)
+ return (0);
+
+ count_prop = DD_FIELD_SNAPSHOT_COUNT;
+ } else {
+ count_prop = DD_FIELD_FILESYSTEM_COUNT;
+ }
+
+ /*
+ * If an ancestor has been provided, stop checking the limit once we
+ * hit that dir. We need this during rename so that we don't overcount
+ * the check once we recurse up to the common ancestor.
+ */
+ if (ancestor == dd)
+ return (0);
+
+ /*
+ * If we hit an uninitialized node while recursing up the tree, we can
+ * stop since we know there is no limit here (or above). The counts are
+ * not valid on this node and we know we won't touch this node's counts.
+ */
+ if (!dsl_dir_is_zapified(dd) || zap_lookup(os, dd->dd_object,
+ count_prop, sizeof (count), 1, &count) == ENOENT)
+ return (0);
+
+ err = dsl_prop_get_dd(dd, zfs_prop_to_name(prop), 8, 1, &limit, NULL,
+ B_FALSE);
+ if (err != 0)
+ return (err);
+
+ /* Is there a limit which we've hit? */
+ if (enforce == ENFORCE_ALWAYS && (count + delta) > limit)
+ return (SET_ERROR(EDQUOT));
+
+ if (dd->dd_parent != NULL)
+ err = dsl_fs_ss_limit_check(dd->dd_parent, delta, prop,
+ ancestor, cr);
+
+ return (err);
+}
+
+/*
+ * Adjust the filesystem or snapshot count for the specified dsl_dir_t and all
+ * parents. When a new filesystem/snapshot is created, increment the count on
+ * all parents, and when a filesystem/snapshot is destroyed, decrement the
+ * count.
+ */
+void
+dsl_fs_ss_count_adjust(dsl_dir_t *dd, int64_t delta, const char *prop,
+ dmu_tx_t *tx)
+{
+ int err;
+ objset_t *os = dd->dd_pool->dp_meta_objset;
+ uint64_t count;
+
+ ASSERT(dsl_pool_config_held(dd->dd_pool));
+ ASSERT(dmu_tx_is_syncing(tx));
+ ASSERT(strcmp(prop, DD_FIELD_FILESYSTEM_COUNT) == 0 ||
+ strcmp(prop, DD_FIELD_SNAPSHOT_COUNT) == 0);
+
+ /*
+ * When we receive an incremental stream into a filesystem that already
+ * exists, a temporary clone is created. We don't count this temporary
+ * clone, whose name begins with a '%'. We also ignore hidden ($FREE,
+ * $MOS & $ORIGIN) objsets.
+ */
+ if ((dd->dd_myname[0] == '%' || dd->dd_myname[0] == '$') &&
+ strcmp(prop, DD_FIELD_FILESYSTEM_COUNT) == 0)
+ return;
+
+ /*
+ * e.g. if renaming a dataset with no snapshots, count adjustment is 0
+ */
+ if (delta == 0)
+ return;
+
+ /*
+ * If we hit an uninitialized node while recursing up the tree, we can
+ * stop since we know the counts are not valid on this node and we
+ * know we shouldn't touch this node's counts. An uninitialized count
+ * on the node indicates that either the feature has not yet been
+ * activated or there are no limits on this part of the tree.
+ */
+ if (!dsl_dir_is_zapified(dd) || (err = zap_lookup(os, dd->dd_object,
+ prop, sizeof (count), 1, &count)) == ENOENT)
+ return;
+ VERIFY0(err);
+
+ count += delta;
+ /* Use a signed verify to make sure we're not neg. */
+ VERIFY3S(count, >=, 0);
+
+ VERIFY0(zap_update(os, dd->dd_object, prop, sizeof (count), 1, &count,
+ tx));
+
+ /* Roll up this additional count into our ancestors */
+ if (dd->dd_parent != NULL)
+ dsl_fs_ss_count_adjust(dd->dd_parent, delta, prop, tx);
+}
+
uint64_t
dsl_dir_create_sync(dsl_pool_t *dp, dsl_dir_t *pds, const char *name,
dmu_tx_t *tx)
@@ -408,8 +880,12 @@ dsl_dir_create_sync(dsl_pool_t *dp, dsl_dir_t *pds, const char *name,
ddphys = dbuf->db_data;
ddphys->dd_creation_time = gethrestime_sec();
- if (pds)
+ if (pds) {
ddphys->dd_parent_obj = pds->dd_object;
+
+ /* update the filesystem counts */
+ dsl_fs_ss_count_adjust(pds, 1, DD_FIELD_FILESYSTEM_COUNT, tx);
+ }
ddphys->dd_props_zapobj = zap_create(mos,
DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx);
ddphys->dd_child_dir_zapobj = zap_create(mos,
@@ -458,6 +934,22 @@ dsl_dir_stats(dsl_dir_t *dd, nvlist_t *nv)
}
mutex_exit(&dd->dd_lock);
+ if (dsl_dir_is_zapified(dd)) {
+ uint64_t count;
+ objset_t *os = dd->dd_pool->dp_meta_objset;
+
+ if (zap_lookup(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
+ sizeof (count), 1, &count) == 0) {
+ dsl_prop_nvlist_add_uint64(nv,
+ ZFS_PROP_FILESYSTEM_COUNT, count);
+ }
+ if (zap_lookup(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
+ sizeof (count), 1, &count) == 0) {
+ dsl_prop_nvlist_add_uint64(nv,
+ ZFS_PROP_SNAPSHOT_COUNT, count);
+ }
+ }
+
if (dsl_dir_is_clone(dd)) {
dsl_dataset_t *ds;
char buf[MAXNAMELEN];
@@ -1166,6 +1658,7 @@ would_change(dsl_dir_t *dd, int64_t delta, dsl_dir_t *ancestor)
typedef struct dsl_dir_rename_arg {
const char *ddra_oldname;
const char *ddra_newname;
+ cred_t *ddra_cred;
} dsl_dir_rename_arg_t;
/* ARGSUSED */
@@ -1230,10 +1723,50 @@ dsl_dir_rename_check(void *arg, dmu_tx_t *tx)
}
}
+ if (dmu_tx_is_syncing(tx)) {
+ if (spa_feature_is_enabled(dp->dp_spa,
+ SPA_FEATURE_FS_SS_LIMIT)) {
+ /*
+ * Although this is the check function and we don't
+ * normally make on-disk changes in check functions,
+ * we need to do that here.
+ *
+ * Ensure this portion of the tree's counts have been
+ * initialized in case the new parent has limits set.
+ */
+ dsl_dir_init_fs_ss_count(dd, tx);
+ }
+ }
+
if (newparent != dd->dd_parent) {
/* is there enough space? */
uint64_t myspace =
MAX(dd->dd_phys->dd_used_bytes, dd->dd_phys->dd_reserved);
+ objset_t *os = dd->dd_pool->dp_meta_objset;
+ uint64_t fs_cnt = 0;
+ uint64_t ss_cnt = 0;
+
+ if (dsl_dir_is_zapified(dd)) {
+ int err;
+
+ err = zap_lookup(os, dd->dd_object,
+ DD_FIELD_FILESYSTEM_COUNT, sizeof (fs_cnt), 1,
+ &fs_cnt);
+ if (err != ENOENT && err != 0)
+ return (err);
+
+ /*
+ * have to add 1 for the filesystem itself that we're
+ * moving
+ */
+ fs_cnt++;
+
+ err = zap_lookup(os, dd->dd_object,
+ DD_FIELD_SNAPSHOT_COUNT, sizeof (ss_cnt), 1,
+ &ss_cnt);
+ if (err != ENOENT && err != 0)
+ return (err);
+ }
/* no rename into our descendant */
if (closest_common_ancestor(dd, newparent) == dd) {
@@ -1243,7 +1776,7 @@ dsl_dir_rename_check(void *arg, dmu_tx_t *tx)
}
error = dsl_dir_transfer_possible(dd->dd_parent,
- newparent, myspace);
+ newparent, fs_cnt, ss_cnt, myspace, ddra->ddra_cred);
if (error != 0) {
dsl_dir_rele(newparent, FTAG);
dsl_dir_rele(dd, FTAG);
@@ -1275,6 +1808,37 @@ dsl_dir_rename_sync(void *arg, dmu_tx_t *tx)
"-> %s", ddra->ddra_newname);
if (newparent != dd->dd_parent) {
+ objset_t *os = dd->dd_pool->dp_meta_objset;
+ uint64_t fs_cnt = 0;
+ uint64_t ss_cnt = 0;
+
+ /*
+ * We already made sure the dd counts were initialized in the
+ * check function.
+ */
+ if (spa_feature_is_enabled(dp->dp_spa,
+ SPA_FEATURE_FS_SS_LIMIT)) {
+ VERIFY0(zap_lookup(os, dd->dd_object,
+ DD_FIELD_FILESYSTEM_COUNT, sizeof (fs_cnt), 1,
+ &fs_cnt));
+ /* add 1 for the filesystem itself that we're moving */
+ fs_cnt++;
+
+ VERIFY0(zap_lookup(os, dd->dd_object,
+ DD_FIELD_SNAPSHOT_COUNT, sizeof (ss_cnt), 1,
+ &ss_cnt));
+ }
+
+ dsl_fs_ss_count_adjust(dd->dd_parent, -fs_cnt,
+ DD_FIELD_FILESYSTEM_COUNT, tx);
+ dsl_fs_ss_count_adjust(newparent, fs_cnt,
+ DD_FIELD_FILESYSTEM_COUNT, tx);
+
+ dsl_fs_ss_count_adjust(dd->dd_parent, -ss_cnt,
+ DD_FIELD_SNAPSHOT_COUNT, tx);
+ dsl_fs_ss_count_adjust(newparent, ss_cnt,
+ DD_FIELD_SNAPSHOT_COUNT, tx);
+
dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD,
-dd->dd_phys->dd_used_bytes,
-dd->dd_phys->dd_compressed_bytes,
@@ -1329,17 +1893,20 @@ dsl_dir_rename(const char *oldname, const char *newname)
ddra.ddra_oldname = oldname;
ddra.ddra_newname = newname;
+ ddra.ddra_cred = CRED();
return (dsl_sync_task(oldname,
dsl_dir_rename_check, dsl_dir_rename_sync, &ddra, 3));
}
int
-dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd, uint64_t space)
+dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd,
+ uint64_t fs_cnt, uint64_t ss_cnt, uint64_t space, cred_t *cr)
{
dsl_dir_t *ancestor;
int64_t adelta;
uint64_t avail;
+ int err;
ancestor = closest_common_ancestor(sdd, tdd);
adelta = would_change(sdd, -space, ancestor);
@@ -1347,6 +1914,15 @@ dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd, uint64_t space)
if (avail < space)
return (SET_ERROR(ENOSPC));
+ err = dsl_fs_ss_limit_check(tdd, fs_cnt, ZFS_PROP_FILESYSTEM_LIMIT,
+ ancestor, cr);
+ if (err != 0)
+ return (err);
+ err = dsl_fs_ss_limit_check(tdd, ss_cnt, ZFS_PROP_SNAPSHOT_LIMIT,
+ ancestor, cr);
+ if (err != 0)
+ return (err);
+
return (0);
}
@@ -1380,6 +1956,15 @@ dsl_dir_zapify(dsl_dir_t *dd, dmu_tx_t *tx)
dmu_object_zapify(mos, dd->dd_object, DMU_OT_DSL_DIR, tx);
}
+boolean_t
+dsl_dir_is_zapified(dsl_dir_t *dd)
+{
+ dmu_object_info_t doi;
+
+ dmu_object_info_from_db(dd->dd_dbuf, &doi);
+ return (doi.doi_type == DMU_OTN_ZAP_METADATA);
+}
+
#if defined(_KERNEL) && defined(HAVE_SPL)
EXPORT_SYMBOL(dsl_dir_set_quota);
EXPORT_SYMBOL(dsl_dir_set_reservation);