FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/zfs/spa_history.c

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License (the "License").
      * You may not use this file except in compliance with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      * or https://opensource.org/licenses/CDDL-1.0.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    
    /*
     * Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
     * Copyright (c) 2011, 2018 by Delphix. All rights reserved.
     * Copyright (c) 2014 Integros [integros.com]
     * Copyright 2017 Joyent, Inc.
     */
    
    #include <sys/spa.h>
    #include <sys/spa_impl.h>
    #include <sys/zap.h>
    #include <sys/dsl_synctask.h>
    #include <sys/dmu_tx.h>
    #include <sys/dmu_objset.h>
    #include <sys/dsl_dataset.h>
    #include <sys/dsl_dir.h>
    #include <sys/cmn_err.h>
    #include <sys/sunddi.h>
    #include <sys/cred.h>
    #include "zfs_comutil.h"
    #include "zfs_gitrev.h"
    #ifdef _KERNEL
    #include <sys/zone.h>
    #endif
    
    /*
     * Routines to manage the on-disk history log.
     *
     * The history log is stored as a dmu object containing
     * <packed record length, record nvlist> tuples.
     *
     * Where "record nvlist" is an nvlist containing uint64_ts and strings, and
     * "packed record length" is the packed length of the "record nvlist" stored
     * as a little endian uint64_t.
     *
     * The log is implemented as a ring buffer, though the original creation
     * of the pool ('zpool create') is never overwritten.
     *
     * The history log is tracked as object 'spa_t::spa_history'.  The bonus buffer
     * of 'spa_history' stores the offsets for logging/retrieving history as
     * 'spa_history_phys_t'.  'sh_pool_create_len' is the ending offset in bytes of
     * where the 'zpool create' record is stored.  This allows us to never
     * overwrite the original creation of the pool.  'sh_phys_max_off' is the
     * physical ending offset in bytes of the log.  This tells you the length of
     * the buffer. 'sh_eof' is the logical EOF (in bytes).  Whenever a record
     * is added, 'sh_eof' is incremented by the size of the record.
     * 'sh_eof' is never decremented.  'sh_bof' is the logical BOF (in bytes).
     * This is where the consumer should start reading from after reading in
     * the 'zpool create' portion of the log.
     *
     * 'sh_records_lost' keeps track of how many records have been overwritten
     * and permanently lost.
     */
    
    /* convert a logical offset to physical */
    static uint64_t
    spa_history_log_to_phys(uint64_t log_off, spa_history_phys_t *shpp)
    {
            uint64_t phys_len;
    
            phys_len = shpp->sh_phys_max_off - shpp->sh_pool_create_len;
            return ((log_off - shpp->sh_pool_create_len) % phys_len
                + shpp->sh_pool_create_len);
    }
    
    void
    spa_history_create_obj(spa_t *spa, dmu_tx_t *tx)
    {
            dmu_buf_t *dbp;
            spa_history_phys_t *shpp;
            objset_t *mos = spa->spa_meta_objset;
    
            ASSERT0(spa->spa_history);
            spa->spa_history = dmu_object_alloc(mos, DMU_OT_SPA_HISTORY,
                SPA_OLD_MAXBLOCKSIZE, DMU_OT_SPA_HISTORY_OFFSETS,
                sizeof (spa_history_phys_t), tx);
    
            VERIFY0(zap_add(mos, DMU_POOL_DIRECTORY_OBJECT,
                DMU_POOL_HISTORY, sizeof (uint64_t), 1,
               &spa->spa_history, tx));
   
           VERIFY0(dmu_bonus_hold(mos, spa->spa_history, FTAG, &dbp));
           ASSERT3U(dbp->db_size, >=, sizeof (spa_history_phys_t));
   
           shpp = dbp->db_data;
           dmu_buf_will_dirty(dbp, tx);
   
           /*
            * Figure out maximum size of history log.  We set it at
            * 0.1% of pool size, with a max of 1G and min of 128KB.
            */
           shpp->sh_phys_max_off =
               metaslab_class_get_dspace(spa_normal_class(spa)) / 1000;
           shpp->sh_phys_max_off = MIN(shpp->sh_phys_max_off, 1<<30);
           shpp->sh_phys_max_off = MAX(shpp->sh_phys_max_off, 128<<10);
   
           dmu_buf_rele(dbp, FTAG);
   }
   
   /*
    * Change 'sh_bof' to the beginning of the next record.
    */
   static int
   spa_history_advance_bof(spa_t *spa, spa_history_phys_t *shpp)
   {
           objset_t *mos = spa->spa_meta_objset;
           uint64_t firstread, reclen, phys_bof;
           char buf[sizeof (reclen)];
           int err;
   
           phys_bof = spa_history_log_to_phys(shpp->sh_bof, shpp);
           firstread = MIN(sizeof (reclen), shpp->sh_phys_max_off - phys_bof);
   
           if ((err = dmu_read(mos, spa->spa_history, phys_bof, firstread,
               buf, DMU_READ_PREFETCH)) != 0)
                   return (err);
           if (firstread != sizeof (reclen)) {
                   if ((err = dmu_read(mos, spa->spa_history,
                       shpp->sh_pool_create_len, sizeof (reclen) - firstread,
                       buf + firstread, DMU_READ_PREFETCH)) != 0)
                           return (err);
           }
   
           reclen = LE_64(*((uint64_t *)buf));
           shpp->sh_bof += reclen + sizeof (reclen);
           shpp->sh_records_lost++;
           return (0);
   }
   
   static int
   spa_history_write(spa_t *spa, void *buf, uint64_t len, spa_history_phys_t *shpp,
       dmu_tx_t *tx)
   {
           uint64_t firstwrite, phys_eof;
           objset_t *mos = spa->spa_meta_objset;
           int err;
   
           ASSERT(MUTEX_HELD(&spa->spa_history_lock));
   
           /* see if we need to reset logical BOF */
           while (shpp->sh_phys_max_off - shpp->sh_pool_create_len -
               (shpp->sh_eof - shpp->sh_bof) <= len) {
                   if ((err = spa_history_advance_bof(spa, shpp)) != 0) {
                           return (err);
                   }
           }
   
           phys_eof = spa_history_log_to_phys(shpp->sh_eof, shpp);
           firstwrite = MIN(len, shpp->sh_phys_max_off - phys_eof);
           shpp->sh_eof += len;
           dmu_write(mos, spa->spa_history, phys_eof, firstwrite, buf, tx);
   
           len -= firstwrite;
           if (len > 0) {
                   /* write out the rest at the beginning of physical file */
                   dmu_write(mos, spa->spa_history, shpp->sh_pool_create_len,
                       len, (char *)buf + firstwrite, tx);
           }
   
           return (0);
   }
   
   /*
    * Post a history sysevent.
    *
    * The nvlist_t* passed into this function will be transformed into a new
    * nvlist where:
    *
    * 1. Nested nvlists will be flattened to a single level
    * 2. Keys will have their names normalized (to remove any problematic
    * characters, such as whitespace)
    *
    * The nvlist_t passed into this function will duplicated and should be freed
    * by caller.
    *
    */
   static void
   spa_history_log_notify(spa_t *spa, nvlist_t *nvl)
   {
           nvlist_t *hist_nvl = fnvlist_alloc();
           uint64_t uint64;
           char *string;
   
           if (nvlist_lookup_string(nvl, ZPOOL_HIST_CMD, &string) == 0)
                   fnvlist_add_string(hist_nvl, ZFS_EV_HIST_CMD, string);
   
           if (nvlist_lookup_string(nvl, ZPOOL_HIST_INT_NAME, &string) == 0)
                   fnvlist_add_string(hist_nvl, ZFS_EV_HIST_INT_NAME, string);
   
           if (nvlist_lookup_string(nvl, ZPOOL_HIST_ZONE, &string) == 0)
                   fnvlist_add_string(hist_nvl, ZFS_EV_HIST_ZONE, string);
   
           if (nvlist_lookup_string(nvl, ZPOOL_HIST_HOST, &string) == 0)
                   fnvlist_add_string(hist_nvl, ZFS_EV_HIST_HOST, string);
   
           if (nvlist_lookup_string(nvl, ZPOOL_HIST_DSNAME, &string) == 0)
                   fnvlist_add_string(hist_nvl, ZFS_EV_HIST_DSNAME, string);
   
           if (nvlist_lookup_string(nvl, ZPOOL_HIST_INT_STR, &string) == 0)
                   fnvlist_add_string(hist_nvl, ZFS_EV_HIST_INT_STR, string);
   
           if (nvlist_lookup_string(nvl, ZPOOL_HIST_IOCTL, &string) == 0)
                   fnvlist_add_string(hist_nvl, ZFS_EV_HIST_IOCTL, string);
   
           if (nvlist_lookup_string(nvl, ZPOOL_HIST_INT_NAME, &string) == 0)
                   fnvlist_add_string(hist_nvl, ZFS_EV_HIST_INT_NAME, string);
   
           if (nvlist_lookup_uint64(nvl, ZPOOL_HIST_DSID, &uint64) == 0)
                   fnvlist_add_uint64(hist_nvl, ZFS_EV_HIST_DSID, uint64);
   
           if (nvlist_lookup_uint64(nvl, ZPOOL_HIST_TXG, &uint64) == 0)
                   fnvlist_add_uint64(hist_nvl, ZFS_EV_HIST_TXG, uint64);
   
           if (nvlist_lookup_uint64(nvl, ZPOOL_HIST_TIME, &uint64) == 0)
                   fnvlist_add_uint64(hist_nvl, ZFS_EV_HIST_TIME, uint64);
   
           if (nvlist_lookup_uint64(nvl, ZPOOL_HIST_WHO, &uint64) == 0)
                   fnvlist_add_uint64(hist_nvl, ZFS_EV_HIST_WHO, uint64);
   
           if (nvlist_lookup_uint64(nvl, ZPOOL_HIST_INT_EVENT, &uint64) == 0)
                   fnvlist_add_uint64(hist_nvl, ZFS_EV_HIST_INT_EVENT, uint64);
   
           spa_event_notify(spa, NULL, hist_nvl, ESC_ZFS_HISTORY_EVENT);
   
           nvlist_free(hist_nvl);
   }
   
   /*
    * Write out a history event.
    */
   static void
   spa_history_log_sync(void *arg, dmu_tx_t *tx)
   {
           nvlist_t        *nvl = arg;
           spa_t           *spa = dmu_tx_pool(tx)->dp_spa;
           objset_t        *mos = spa->spa_meta_objset;
           dmu_buf_t       *dbp;
           spa_history_phys_t *shpp;
           size_t          reclen;
           uint64_t        le_len;
           char            *record_packed = NULL;
           int             ret;
   
           /*
            * If we have an older pool that doesn't have a command
            * history object, create it now.
            */
           mutex_enter(&spa->spa_history_lock);
           if (!spa->spa_history)
                   spa_history_create_obj(spa, tx);
           mutex_exit(&spa->spa_history_lock);
   
           /*
            * Get the offset of where we need to write via the bonus buffer.
            * Update the offset when the write completes.
            */
           VERIFY0(dmu_bonus_hold(mos, spa->spa_history, FTAG, &dbp));
           shpp = dbp->db_data;
   
           dmu_buf_will_dirty(dbp, tx);
   
   #ifdef ZFS_DEBUG
           {
                   dmu_object_info_t doi;
                   dmu_object_info_from_db(dbp, &doi);
                   ASSERT3U(doi.doi_bonus_type, ==, DMU_OT_SPA_HISTORY_OFFSETS);
           }
   #endif
   
           fnvlist_add_string(nvl, ZPOOL_HIST_HOST, utsname()->nodename);
   
           if (nvlist_exists(nvl, ZPOOL_HIST_CMD)) {
                   zfs_dbgmsg("command: %s",
                       fnvlist_lookup_string(nvl, ZPOOL_HIST_CMD));
           } else if (nvlist_exists(nvl, ZPOOL_HIST_INT_NAME)) {
                   if (nvlist_exists(nvl, ZPOOL_HIST_DSNAME)) {
                           zfs_dbgmsg("txg %lld %s %s (id %llu) %s",
                               (longlong_t)fnvlist_lookup_uint64(nvl,
                               ZPOOL_HIST_TXG),
                               fnvlist_lookup_string(nvl, ZPOOL_HIST_INT_NAME),
                               fnvlist_lookup_string(nvl, ZPOOL_HIST_DSNAME),
                               (u_longlong_t)fnvlist_lookup_uint64(nvl,
                               ZPOOL_HIST_DSID),
                               fnvlist_lookup_string(nvl, ZPOOL_HIST_INT_STR));
                   } else {
                           zfs_dbgmsg("txg %lld %s %s",
                               (longlong_t)fnvlist_lookup_uint64(nvl,
                               ZPOOL_HIST_TXG),
                               fnvlist_lookup_string(nvl, ZPOOL_HIST_INT_NAME),
                               fnvlist_lookup_string(nvl, ZPOOL_HIST_INT_STR));
                   }
                   /*
                    * The history sysevent is posted only for internal history
                    * messages to show what has happened, not how it happened. For
                    * example, the following command:
                    *
                    * # zfs destroy -r tank/foo
                    *
                    * will result in one sysevent posted per dataset that is
                    * destroyed as a result of the command - which could be more
                    * than one event in total.  By contrast, if the sysevent was
                    * posted as a result of the ZPOOL_HIST_CMD key being present
                    * it would result in only one sysevent being posted with the
                    * full command line arguments, requiring the consumer to know
                    * how to parse and understand zfs(8) command invocations.
                    */
                   spa_history_log_notify(spa, nvl);
           } else if (nvlist_exists(nvl, ZPOOL_HIST_IOCTL)) {
                   zfs_dbgmsg("ioctl %s",
                       fnvlist_lookup_string(nvl, ZPOOL_HIST_IOCTL));
           }
   
           VERIFY3U(nvlist_pack(nvl, &record_packed, &reclen, NV_ENCODE_NATIVE,
               KM_SLEEP), ==, 0);
   
           mutex_enter(&spa->spa_history_lock);
   
           /* write out the packed length as little endian */
           le_len = LE_64((uint64_t)reclen);
           ret = spa_history_write(spa, &le_len, sizeof (le_len), shpp, tx);
           if (!ret)
                   ret = spa_history_write(spa, record_packed, reclen, shpp, tx);
   
           /* The first command is the create, which we keep forever */
           if (ret == 0 && shpp->sh_pool_create_len == 0 &&
               nvlist_exists(nvl, ZPOOL_HIST_CMD)) {
                   shpp->sh_pool_create_len = shpp->sh_bof = shpp->sh_eof;
           }
   
           mutex_exit(&spa->spa_history_lock);
           fnvlist_pack_free(record_packed, reclen);
           dmu_buf_rele(dbp, FTAG);
           fnvlist_free(nvl);
   }
   
   /*
    * Write out a history event.
    */
   int
   spa_history_log(spa_t *spa, const char *msg)
   {
           int err;
           nvlist_t *nvl = fnvlist_alloc();
   
           fnvlist_add_string(nvl, ZPOOL_HIST_CMD, msg);
           err = spa_history_log_nvl(spa, nvl);
           fnvlist_free(nvl);
           return (err);
   }
   
   int
   spa_history_log_nvl(spa_t *spa, nvlist_t *nvl)
   {
           int err = 0;
           dmu_tx_t *tx;
           nvlist_t *nvarg, *in_nvl = NULL;
   
           if (spa_version(spa) < SPA_VERSION_ZPOOL_HISTORY || !spa_writeable(spa))
                   return (SET_ERROR(EINVAL));
   
           err = nvlist_lookup_nvlist(nvl, ZPOOL_HIST_INPUT_NVL, &in_nvl);
           if (err == 0) {
                   (void) nvlist_remove_all(in_nvl, ZPOOL_HIDDEN_ARGS);
           }
   
           tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
           err = dmu_tx_assign(tx, TXG_WAIT);
           if (err) {
                   dmu_tx_abort(tx);
                   return (err);
           }
   
           VERIFY0(nvlist_dup(nvl, &nvarg, KM_SLEEP));
           if (spa_history_zone() != NULL) {
                   fnvlist_add_string(nvarg, ZPOOL_HIST_ZONE,
                       spa_history_zone());
           }
           fnvlist_add_uint64(nvarg, ZPOOL_HIST_WHO, crgetruid(CRED()));
   
           /*
            * Since the history is recorded asynchronously, the effective time is
            * now, which may be considerably before the change is made on disk.
            */
           fnvlist_add_uint64(nvarg, ZPOOL_HIST_TIME, gethrestime_sec());
   
           /* Kick this off asynchronously; errors are ignored. */
           dsl_sync_task_nowait(spa_get_dsl(spa), spa_history_log_sync, nvarg, tx);
           dmu_tx_commit(tx);
   
           /* spa_history_log_sync will free nvl */
           return (err);
   }
   
   /*
    * Read out the command history.
    */
   int
   spa_history_get(spa_t *spa, uint64_t *offp, uint64_t *len, char *buf)
   {
           objset_t *mos = spa->spa_meta_objset;
           dmu_buf_t *dbp;
           uint64_t read_len, phys_read_off, phys_eof;
           uint64_t leftover = 0;
           spa_history_phys_t *shpp;
           int err;
   
           /*
            * If the command history doesn't exist (older pool),
            * that's ok, just return ENOENT.
            */
           if (!spa->spa_history)
                   return (SET_ERROR(ENOENT));
   
           /*
            * The history is logged asynchronously, so when they request
            * the first chunk of history, make sure everything has been
            * synced to disk so that we get it.
            */
           if (*offp == 0 && spa_writeable(spa))
                   txg_wait_synced(spa_get_dsl(spa), 0);
   
           if ((err = dmu_bonus_hold(mos, spa->spa_history, FTAG, &dbp)) != 0)
                   return (err);
           shpp = dbp->db_data;
   
   #ifdef ZFS_DEBUG
           {
                   dmu_object_info_t doi;
                   dmu_object_info_from_db(dbp, &doi);
                   ASSERT3U(doi.doi_bonus_type, ==, DMU_OT_SPA_HISTORY_OFFSETS);
           }
   #endif
   
           mutex_enter(&spa->spa_history_lock);
           phys_eof = spa_history_log_to_phys(shpp->sh_eof, shpp);
   
           if (*offp < shpp->sh_pool_create_len) {
                   /* read in just the zpool create history */
                   phys_read_off = *offp;
                   read_len = MIN(*len, shpp->sh_pool_create_len -
                       phys_read_off);
           } else {
                   /*
                    * Need to reset passed in offset to BOF if the passed in
                    * offset has since been overwritten.
                    */
                   *offp = MAX(*offp, shpp->sh_bof);
                   phys_read_off = spa_history_log_to_phys(*offp, shpp);
   
                   /*
                    * Read up to the minimum of what the user passed down or
                    * the EOF (physical or logical).  If we hit physical EOF,
                    * use 'leftover' to read from the physical BOF.
                    */
                   if (phys_read_off <= phys_eof) {
                           read_len = MIN(*len, phys_eof - phys_read_off);
                   } else {
                           read_len = MIN(*len,
                               shpp->sh_phys_max_off - phys_read_off);
                           if (phys_read_off + *len > shpp->sh_phys_max_off) {
                                   leftover = MIN(*len - read_len,
                                       phys_eof - shpp->sh_pool_create_len);
                           }
                   }
           }
   
           /* offset for consumer to use next */
           *offp += read_len + leftover;
   
           /* tell the consumer how much you actually read */
           *len = read_len + leftover;
   
           if (read_len == 0) {
                   mutex_exit(&spa->spa_history_lock);
                   dmu_buf_rele(dbp, FTAG);
                   return (0);
           }
   
           err = dmu_read(mos, spa->spa_history, phys_read_off, read_len, buf,
               DMU_READ_PREFETCH);
           if (leftover && err == 0) {
                   err = dmu_read(mos, spa->spa_history, shpp->sh_pool_create_len,
                       leftover, buf + read_len, DMU_READ_PREFETCH);
           }
           mutex_exit(&spa->spa_history_lock);
   
           dmu_buf_rele(dbp, FTAG);
           return (err);
   }
   
   /*
    * The nvlist will be consumed by this call.
    */
   static void
   log_internal(nvlist_t *nvl, const char *operation, spa_t *spa,
       dmu_tx_t *tx, const char *fmt, va_list adx)
   {
           char *msg;
   
           /*
            * If this is part of creating a pool, not everything is
            * initialized yet, so don't bother logging the internal events.
            * Likewise if the pool is not writeable.
            */
           if (spa_is_initializing(spa) || !spa_writeable(spa)) {
                   fnvlist_free(nvl);
                   return;
           }
   
           msg = kmem_vasprintf(fmt, adx);
           fnvlist_add_string(nvl, ZPOOL_HIST_INT_STR, msg);
           kmem_strfree(msg);
   
           fnvlist_add_string(nvl, ZPOOL_HIST_INT_NAME, operation);
           fnvlist_add_uint64(nvl, ZPOOL_HIST_TXG, tx->tx_txg);
           fnvlist_add_uint64(nvl, ZPOOL_HIST_TIME, gethrestime_sec());
   
           if (dmu_tx_is_syncing(tx)) {
                   spa_history_log_sync(nvl, tx);
           } else {
                   dsl_sync_task_nowait(spa_get_dsl(spa),
                       spa_history_log_sync, nvl, tx);
           }
           /* spa_history_log_sync() will free nvl */
   }
   
   void
   spa_history_log_internal(spa_t *spa, const char *operation,
       dmu_tx_t *tx, const char *fmt, ...)
   {
           dmu_tx_t *htx = tx;
           va_list adx;
   
           /* create a tx if we didn't get one */
           if (tx == NULL) {
                   htx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
                   if (dmu_tx_assign(htx, TXG_WAIT) != 0) {
                           dmu_tx_abort(htx);
                           return;
                   }
           }
   
           va_start(adx, fmt);
           log_internal(fnvlist_alloc(), operation, spa, htx, fmt, adx);
           va_end(adx);
   
           /* if we didn't get a tx from the caller, commit the one we made */
           if (tx == NULL)
                   dmu_tx_commit(htx);
   }
   
   void
   spa_history_log_internal_ds(dsl_dataset_t *ds, const char *operation,
       dmu_tx_t *tx, const char *fmt, ...)
   {
           va_list adx;
           char namebuf[ZFS_MAX_DATASET_NAME_LEN];
           nvlist_t *nvl = fnvlist_alloc();
   
           ASSERT(tx != NULL);
   
           dsl_dataset_name(ds, namebuf);
           fnvlist_add_string(nvl, ZPOOL_HIST_DSNAME, namebuf);
           fnvlist_add_uint64(nvl, ZPOOL_HIST_DSID, ds->ds_object);
   
           va_start(adx, fmt);
           log_internal(nvl, operation, dsl_dataset_get_spa(ds), tx, fmt, adx);
           va_end(adx);
   }
   
   void
   spa_history_log_internal_dd(dsl_dir_t *dd, const char *operation,
       dmu_tx_t *tx, const char *fmt, ...)
   {
           va_list adx;
           char namebuf[ZFS_MAX_DATASET_NAME_LEN];
           nvlist_t *nvl = fnvlist_alloc();
   
           ASSERT(tx != NULL);
   
           dsl_dir_name(dd, namebuf);
           fnvlist_add_string(nvl, ZPOOL_HIST_DSNAME, namebuf);
           fnvlist_add_uint64(nvl, ZPOOL_HIST_DSID,
               dsl_dir_phys(dd)->dd_head_dataset_obj);
   
           va_start(adx, fmt);
           log_internal(nvl, operation, dd->dd_pool->dp_spa, tx, fmt, adx);
           va_end(adx);
   }
   
   void
   spa_history_log_version(spa_t *spa, const char *operation, dmu_tx_t *tx)
   {
           utsname_t *u = utsname();
   
           spa_history_log_internal(spa, operation, tx,
               "pool version %llu; software version %s; uts %s %s %s %s",
               (u_longlong_t)spa_version(spa), ZFS_META_GITREV,
               u->nodename, u->release, u->version, u->machine);
   }
   
   #ifndef _KERNEL
   const char *
   spa_history_zone(void)
   {
           return (NULL);
   }
   #endif
   
   #if defined(_KERNEL)
   EXPORT_SYMBOL(spa_history_create_obj);
   EXPORT_SYMBOL(spa_history_get);
   EXPORT_SYMBOL(spa_history_log);
   EXPORT_SYMBOL(spa_history_log_internal);
   EXPORT_SYMBOL(spa_history_log_version);
   #endif

Cache object: 2c3795891020fe842070d1b050288699