Author: delphij
Date: Thu Aug  8 23:38:31 2013
New Revision: 254112
URL: http://svnweb.freebsd.org/changeset/base/254112

Log:
  MFV r254079:
  
  Illumos ZFS issues:
    3957 ztest should update the cachefile before killing itself
    3958 multiple scans can lead to partial resilvering
    3959 ddt entries are not always resilvered
    3960 dsl_scan can skip over dedup-ed blocks if
         physical birth != logical birth
    3961 freed gang blocks are not resilvered and can cause pool to suspend
    3962 ztest should print out zfs debug buffer before exiting

Modified:
  head/cddl/contrib/opensolaris/cmd/ztest/ztest.c
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_scan.c
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_config.c
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/dsl_scan.h
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/vdev_impl.h
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_debug.h
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_label.c
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_debug.c
  head/sys/cddl/contrib/opensolaris/uts/common/sys/fs/zfs.h
Directory Properties:
  head/cddl/contrib/opensolaris/   (props changed)
  head/sys/cddl/contrib/opensolaris/   (props changed)

Modified: head/cddl/contrib/opensolaris/cmd/ztest/ztest.c
==============================================================================
--- head/cddl/contrib/opensolaris/cmd/ztest/ztest.c     Thu Aug  8 23:24:36 
2013        (r254111)
+++ head/cddl/contrib/opensolaris/cmd/ztest/ztest.c     Thu Aug  8 23:38:31 
2013        (r254112)
@@ -20,7 +20,7 @@
  */
 /*
  * 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 2011 Nexenta Systems, Inc.  All rights reserved.
  * Copyright (c) 2012 Martin Matuska <m...@freebsd.org>.  All rights reserved.
  * Copyright (c) 2013 Steven Hartland. All rights reserved.
@@ -769,6 +769,16 @@ ztest_kill(ztest_shared_t *zs)
 {
        zs->zs_alloc = metaslab_class_get_alloc(spa_normal_class(ztest_spa));
        zs->zs_space = metaslab_class_get_space(spa_normal_class(ztest_spa));
+
+       /*
+        * Before we kill off ztest, make sure that the config is updated.
+        * See comment above spa_config_sync().
+        */
+       mutex_enter(&spa_namespace_lock);
+       spa_config_sync(ztest_spa, B_FALSE, B_FALSE);
+       mutex_exit(&spa_namespace_lock);
+
+       zfs_dbgmsg_print(FTAG);
        (void) kill(getpid(), SIGKILL);
 }
 
@@ -2733,7 +2743,7 @@ ztest_vdev_attach_detach(ztest_ds_t *zd,
        uint64_t leaf, top;
        uint64_t ashift = ztest_get_ashift();
        uint64_t oldguid, pguid;
-       size_t oldsize, newsize;
+       uint64_t oldsize, newsize;
        char oldpath[MAXPATHLEN], newpath[MAXPATHLEN];
        int replacing;
        int oldvd_has_siblings = B_FALSE;
@@ -2892,8 +2902,8 @@ ztest_vdev_attach_detach(ztest_ds_t *zd,
        if (error != expected_error && expected_error != EBUSY) {
                fatal(0, "attach (%s %llu, %s %llu, %d) "
                    "returned %d, expected %d",
-                   oldpath, (longlong_t)oldsize, newpath,
-                   (longlong_t)newsize, replacing, error, expected_error);
+                   oldpath, oldsize, newpath,
+                   newsize, replacing, error, expected_error);
        }
 
        VERIFY(mutex_unlock(&ztest_vdev_lock) == 0);
@@ -4803,7 +4813,7 @@ ztest_fault_inject(ztest_ds_t *zd, uint6
                 */
                if (vd0 != NULL && maxfaults != 1 &&
                    (!vdev_resilver_needed(vd0->vdev_top, NULL, NULL) ||
-                   vd0->vdev_resilvering)) {
+                   vd0->vdev_resilver_txg != 0)) {
                        /*
                         * Make vd0 explicitly claim to be unreadable,
                         * or unwriteable, or reach behind its back
@@ -5654,6 +5664,7 @@ ztest_run(ztest_shared_t *zs)
 
        zs->zs_alloc = metaslab_class_get_alloc(spa_normal_class(spa));
        zs->zs_space = metaslab_class_get_space(spa_normal_class(spa));
+       zfs_dbgmsg_print(FTAG);
 
        umem_free(tid, ztest_opts.zo_threads * sizeof (thread_t));
 

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_scan.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_scan.c      Thu Aug 
 8 23:24:36 2013        (r254111)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_scan.c      Thu Aug 
 8 23:38:31 2013        (r254112)
@@ -224,6 +224,7 @@ dsl_scan_setup_sync(void *arg, dmu_tx_t 
        scn->scn_phys.scn_errors = 0;
        scn->scn_phys.scn_to_examine = spa->spa_root_vdev->vdev_stat.vs_alloc;
        scn->scn_restart_txg = 0;
+       scn->scn_done_txg = 0;
        spa_scan_stat_init(spa);
 
        if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) {
@@ -800,7 +801,7 @@ dsl_scan_visitbp(blkptr_t *bp, const zbo
         * Don't scan it now unless we need to because something
         * under it was modified.
         */
-       if (bp->blk_birth <= scn->scn_phys.scn_cur_max_txg) {
+       if (BP_PHYSICAL_BIRTH(bp) <= scn->scn_phys.scn_cur_max_txg) {
                scan_funcs[scn->scn_phys.scn_func](dp, bp, zb);
        }
        if (buf)
@@ -1245,7 +1246,7 @@ dsl_scan_ddt_entry(dsl_scan_t *scn, enum
 
        for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
                if (ddp->ddp_phys_birth == 0 ||
-                   ddp->ddp_phys_birth > scn->scn_phys.scn_cur_max_txg)
+                   ddp->ddp_phys_birth > scn->scn_phys.scn_max_txg)
                        continue;
                ddt_bp_create(checksum, ddk, ddp, &bp);
 
@@ -1488,6 +1489,16 @@ dsl_scan_sync(dsl_pool_t *dp, dmu_tx_t *
        if (scn->scn_phys.scn_state != DSS_SCANNING)
                return;
 
+       if (scn->scn_done_txg == tx->tx_txg) {
+               ASSERT(!scn->scn_pausing);
+               /* finished with scan. */
+               zfs_dbgmsg("txg %llu scan complete", tx->tx_txg);
+               dsl_scan_done(scn, B_TRUE, tx);
+               ASSERT3U(spa->spa_scrub_inflight, ==, 0);
+               dsl_scan_sync_state(scn, tx);
+               return;
+       }
+
        if (scn->scn_phys.scn_ddt_bookmark.ddb_class <=
            scn->scn_phys.scn_ddt_class_max) {
                zfs_dbgmsg("doing scan sync txg %llu; "
@@ -1523,9 +1534,9 @@ dsl_scan_sync(dsl_pool_t *dp, dmu_tx_t *
            (longlong_t)(gethrtime() - scn->scn_sync_start_time) / MICROSEC);
 
        if (!scn->scn_pausing) {
-               /* finished with scan. */
-               zfs_dbgmsg("finished scan txg %llu", (longlong_t)tx->tx_txg);
-               dsl_scan_done(scn, B_TRUE, tx);
+               scn->scn_done_txg = tx->tx_txg + 1;
+               zfs_dbgmsg("txg %llu traversal complete, waiting till txg %llu",
+                   tx->tx_txg, scn->scn_done_txg);
        }
 
        if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) {

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c   Thu Aug  8 
23:24:36 2013        (r254111)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c   Thu Aug  8 
23:38:31 2013        (r254112)
@@ -4633,7 +4633,7 @@ spa_vdev_attach(spa_t *spa, uint64_t gui
        }
 
        /* mark the device being resilvered */
-       newvd->vdev_resilvering = B_TRUE;
+       newvd->vdev_resilver_txg = txg;
 
        /*
         * If the parent is not a mirror, or if we're replacing, insert the new
@@ -5497,13 +5497,6 @@ spa_vdev_resilver_done_hunt(vdev_t *vd)
                        return (oldvd);
        }
 
-       if (vd->vdev_resilvering && vdev_dtl_empty(vd, DTL_MISSING) &&
-           vdev_dtl_empty(vd, DTL_OUTAGE)) {
-               ASSERT(vd->vdev_ops->vdev_op_leaf);
-               vd->vdev_resilvering = B_FALSE;
-               vdev_config_dirty(vd->vdev_top);
-       }
-
        /*
         * Check for a completed replacement.  We always consider the first
         * vdev in the list to be the oldest vdev, and the last one to be
@@ -5593,6 +5586,8 @@ spa_vdev_resilver_done(spa_t *spa)
                        ASSERT(pvd->vdev_ops == &vdev_replacing_ops);
                        sguid = ppvd->vdev_child[1]->vdev_guid;
                }
+               ASSERT(vd->vdev_resilver_txg == 0 || !vdev_dtl_required(vd));
+
                spa_config_exit(spa, SCL_ALL, FTAG);
                if (spa_vdev_detach(spa, guid, pguid, B_TRUE) != 0)
                        return;

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_config.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_config.c    Thu Aug 
 8 23:24:36 2013        (r254111)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_config.c    Thu Aug 
 8 23:38:31 2013        (r254112)
@@ -22,7 +22,7 @@
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
- * Copyright (c) 2012 by Delphix. All rights reserved.
+ * Copyright (c) 2013 by Delphix. All rights reserved.
  */
 
 #include <sys/zfs_context.h>
@@ -196,7 +196,12 @@ spa_config_write(spa_config_dirent_t *dp
 
 /*
  * Synchronize pool configuration to disk.  This must be called with the
- * namespace lock held.
+ * namespace lock held. Synchronizing the pool cache is typically done after
+ * the configuration has been synced to the MOS. This exposes a window where
+ * the MOS config will have been updated but the cache file has not. If
+ * the system were to crash at that instant then the cached config may not
+ * contain the correct information to open the pool and an explicity import
+ * would be required.
  */
 void
 spa_config_sync(spa_t *target, boolean_t removing, boolean_t postsysevent)

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/dsl_scan.h
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/dsl_scan.h  Thu Aug 
 8 23:24:36 2013        (r254111)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/dsl_scan.h  Thu Aug 
 8 23:38:31 2013        (r254112)
@@ -72,11 +72,42 @@ typedef enum dsl_scan_flags {
        DSF_VISIT_DS_AGAIN = 1<<0,
 } dsl_scan_flags_t;
 
+/*
+ * Every pool will have one dsl_scan_t and this structure will contain
+ * in-memory information about the scan and a pointer to the on-disk
+ * representation (i.e. dsl_scan_phys_t). Most of the state of the scan
+ * is contained on-disk to allow the scan to resume in the event of a reboot
+ * or panic. This structure maintains information about the behavior of a
+ * running scan, some caching information, and how it should traverse the pool.
+ *
+ * The following members of this structure direct the behavior of the scan:
+ *
+ * scn_pausing -       a scan that cannot be completed in a single txg or
+ *                     has exceeded its allotted time will need to pause.
+ *                     When this flag is set the scanner will stop traversing
+ *                     the pool and write out the current state to disk.
+ *
+ * scn_restart_txg -   directs the scanner to either restart or start a
+ *                     a scan at the specified txg value.
+ *
+ * scn_done_txg -      when a scan completes its traversal it will set
+ *                     the completion txg to the next txg. This is necessary
+ *                     to ensure that any blocks that were freed during
+ *                     the scan but have not yet been processed (i.e deferred
+ *                     frees) are accounted for.
+ *
+ * This structure also maintains information about deferred frees which are
+ * a special kind of traversal. Deferred free can exist in either a bptree or
+ * a bpobj structure. The scn_is_bptree flag will indicate the type of
+ * deferred free that is in progress. If the deferred free is part of an
+ * asynchronous destroy then the scn_async_destroying flag will be set.
+ */
 typedef struct dsl_scan {
        struct dsl_pool *scn_dp;
 
        boolean_t scn_pausing;
        uint64_t scn_restart_txg;
+       uint64_t scn_done_txg;
        uint64_t scn_sync_start_time;
        zio_t *scn_zio_root;
 

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/vdev_impl.h
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/vdev_impl.h Thu Aug 
 8 23:24:36 2013        (r254111)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/vdev_impl.h Thu Aug 
 8 23:38:31 2013        (r254112)
@@ -20,7 +20,7 @@
  */
 /*
  * 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.
  */
 
 #ifndef _SYS_VDEV_IMPL_H
@@ -173,7 +173,7 @@ struct vdev {
        uint64_t        vdev_faulted;   /* persistent faulted state     */
        uint64_t        vdev_degraded;  /* persistent degraded state    */
        uint64_t        vdev_removed;   /* persistent removed state     */
-       uint64_t        vdev_resilvering; /* persistent resilvering state */
+       uint64_t        vdev_resilver_txg; /* persistent resilvering state */
        uint64_t        vdev_nparity;   /* number of parity devices for raidz */
        char            *vdev_path;     /* vdev path (if any)           */
        char            *vdev_devid;    /* vdev devid (if any)          */

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_debug.h
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_debug.h Thu Aug 
 8 23:24:36 2013        (r254111)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_debug.h Thu Aug 
 8 23:38:31 2013        (r254112)
@@ -20,7 +20,7 @@
  */
 /*
  * 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.
  */
 
 #ifndef _SYS_ZFS_DEBUG_H
@@ -79,6 +79,7 @@ typedef struct zfs_dbgmsg {
 extern void zfs_dbgmsg_init(void);
 extern void zfs_dbgmsg_fini(void);
 extern void zfs_dbgmsg(const char *fmt, ...);
+extern void zfs_dbgmsg_print(const char *tag);
 
 #ifdef illumos
 #ifndef _KERNEL

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c  Thu Aug  8 
23:24:36 2013        (r254111)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c  Thu Aug  8 
23:38:31 2013        (r254112)
@@ -528,8 +528,8 @@ vdev_alloc(spa_t *spa, vdev_t **vdp, nvl
                (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_OFFLINE,
                    &vd->vdev_offline);
 
-               (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_RESILVERING,
-                   &vd->vdev_resilvering);
+               (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_RESILVER_TXG,
+                   &vd->vdev_resilver_txg);
 
                /*
                 * When importing a pool, we want to ignore the persistent fault
@@ -1678,6 +1678,75 @@ vdev_dtl_empty(vdev_t *vd, vdev_dtl_type
 }
 
 /*
+ * Returns the lowest txg in the DTL range.
+ */
+static uint64_t
+vdev_dtl_min(vdev_t *vd)
+{
+       space_seg_t *ss;
+
+       ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock));
+       ASSERT3U(vd->vdev_dtl[DTL_MISSING].sm_space, !=, 0);
+       ASSERT0(vd->vdev_children);
+
+       ss = avl_first(&vd->vdev_dtl[DTL_MISSING].sm_root);
+       return (ss->ss_start - 1);
+}
+
+/*
+ * Returns the highest txg in the DTL.
+ */
+static uint64_t
+vdev_dtl_max(vdev_t *vd)
+{
+       space_seg_t *ss;
+
+       ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock));
+       ASSERT3U(vd->vdev_dtl[DTL_MISSING].sm_space, !=, 0);
+       ASSERT0(vd->vdev_children);
+
+       ss = avl_last(&vd->vdev_dtl[DTL_MISSING].sm_root);
+       return (ss->ss_end);
+}
+
+/*
+ * Determine if a resilvering vdev should remove any DTL entries from
+ * its range. If the vdev was resilvering for the entire duration of the
+ * scan then it should excise that range from its DTLs. Otherwise, this
+ * vdev is considered partially resilvered and should leave its DTL
+ * entries intact. The comment in vdev_dtl_reassess() describes how we
+ * excise the DTLs.
+ */
+static boolean_t
+vdev_dtl_should_excise(vdev_t *vd)
+{
+       spa_t *spa = vd->vdev_spa;
+       dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan;
+
+       ASSERT0(scn->scn_phys.scn_errors);
+       ASSERT0(vd->vdev_children);
+
+       if (vd->vdev_resilver_txg == 0 ||
+           vd->vdev_dtl[DTL_MISSING].sm_space == 0)
+               return (B_TRUE);
+
+       /*
+        * When a resilver is initiated the scan will assign the scn_max_txg
+        * value to the highest txg value that exists in all DTLs. If this
+        * device's max DTL is not part of this scan (i.e. it is not in
+        * the range (scn_min_txg, scn_max_txg] then it is not eligible
+        * for excision.
+        */
+       if (vdev_dtl_max(vd) <= scn->scn_phys.scn_max_txg) {
+               ASSERT3U(scn->scn_phys.scn_min_txg, <=, vdev_dtl_min(vd));
+               ASSERT3U(scn->scn_phys.scn_min_txg, <, vd->vdev_resilver_txg);
+               ASSERT3U(vd->vdev_resilver_txg, <=, scn->scn_phys.scn_max_txg);
+               return (B_TRUE);
+       }
+       return (B_FALSE);
+}
+
+/*
  * Reassess DTLs after a config change or scrub completion.
  */
 void
@@ -1700,9 +1769,17 @@ vdev_dtl_reassess(vdev_t *vd, uint64_t t
                dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan;
 
                mutex_enter(&vd->vdev_dtl_lock);
+
+               /*
+                * If we've completed a scan cleanly then determine
+                * if this vdev should remove any DTLs. We only want to
+                * excise regions on vdevs that were available during
+                * the entire duration of this scan.
+                */
                if (scrub_txg != 0 &&
                    (spa->spa_scrub_started ||
-                   (scn && scn->scn_phys.scn_errors == 0))) {
+                   (scn != NULL && scn->scn_phys.scn_errors == 0)) &&
+                   vdev_dtl_should_excise(vd)) {
                        /*
                         * We completed a scrub up to scrub_txg.  If we
                         * did it without rebooting, then the scrub dtl
@@ -1741,6 +1818,16 @@ vdev_dtl_reassess(vdev_t *vd, uint64_t t
                else
                        space_map_walk(&vd->vdev_dtl[DTL_MISSING],
                            space_map_add, &vd->vdev_dtl[DTL_OUTAGE]);
+
+               /*
+                * If the vdev was resilvering and no longer has any
+                * DTLs then reset its resilvering flag.
+                */
+               if (vd->vdev_resilver_txg != 0 &&
+                   vd->vdev_dtl[DTL_MISSING].sm_space == 0 &&
+                   vd->vdev_dtl[DTL_OUTAGE].sm_space == 0)
+                       vd->vdev_resilver_txg = 0;
+
                mutex_exit(&vd->vdev_dtl_lock);
 
                if (txg != 0)
@@ -1918,12 +2005,9 @@ vdev_resilver_needed(vdev_t *vd, uint64_
                mutex_enter(&vd->vdev_dtl_lock);
                if (vd->vdev_dtl[DTL_MISSING].sm_space != 0 &&
                    vdev_writeable(vd)) {
-                       space_seg_t *ss;
 
-                       ss = avl_first(&vd->vdev_dtl[DTL_MISSING].sm_root);
-                       thismin = ss->ss_start - 1;
-                       ss = avl_last(&vd->vdev_dtl[DTL_MISSING].sm_root);
-                       thismax = ss->ss_end;
+                       thismin = vdev_dtl_min(vd);
+                       thismax = vdev_dtl_max(vd);
                        needed = B_TRUE;
                }
                mutex_exit(&vd->vdev_dtl_lock);

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_label.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_label.c    Thu Aug 
 8 23:24:36 2013        (r254111)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_label.c    Thu Aug 
 8 23:38:31 2013        (r254112)
@@ -222,30 +222,25 @@ vdev_config_generate(spa_t *spa, vdev_t 
 {
        nvlist_t *nv = NULL;
 
-       VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
+       nv = fnvlist_alloc();
 
-       VERIFY(nvlist_add_string(nv, ZPOOL_CONFIG_TYPE,
-           vd->vdev_ops->vdev_op_type) == 0);
+       fnvlist_add_string(nv, ZPOOL_CONFIG_TYPE, vd->vdev_ops->vdev_op_type);
        if (!(flags & (VDEV_CONFIG_SPARE | VDEV_CONFIG_L2CACHE)))
-               VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_ID, vd->vdev_id)
-                   == 0);
-       VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_GUID, vd->vdev_guid) == 0);
+               fnvlist_add_uint64(nv, ZPOOL_CONFIG_ID, vd->vdev_id);
+       fnvlist_add_uint64(nv, ZPOOL_CONFIG_GUID, vd->vdev_guid);
 
        if (vd->vdev_path != NULL)
-               VERIFY(nvlist_add_string(nv, ZPOOL_CONFIG_PATH,
-                   vd->vdev_path) == 0);
+               fnvlist_add_string(nv, ZPOOL_CONFIG_PATH, vd->vdev_path);
 
        if (vd->vdev_devid != NULL)
-               VERIFY(nvlist_add_string(nv, ZPOOL_CONFIG_DEVID,
-                   vd->vdev_devid) == 0);
+               fnvlist_add_string(nv, ZPOOL_CONFIG_DEVID, vd->vdev_devid);
 
        if (vd->vdev_physpath != NULL)
-               VERIFY(nvlist_add_string(nv, ZPOOL_CONFIG_PHYS_PATH,
-                   vd->vdev_physpath) == 0);
+               fnvlist_add_string(nv, ZPOOL_CONFIG_PHYS_PATH,
+                   vd->vdev_physpath);
 
        if (vd->vdev_fru != NULL)
-               VERIFY(nvlist_add_string(nv, ZPOOL_CONFIG_FRU,
-                   vd->vdev_fru) == 0);
+               fnvlist_add_string(nv, ZPOOL_CONFIG_FRU, vd->vdev_fru);
 
        if (vd->vdev_nparity != 0) {
                ASSERT(strcmp(vd->vdev_ops->vdev_op_type,
@@ -266,59 +261,54 @@ vdev_config_generate(spa_t *spa, vdev_t 
                 * that only support a single parity device -- older software
                 * will just ignore it.
                 */
-               VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_NPARITY,
-                   vd->vdev_nparity) == 0);
+               fnvlist_add_uint64(nv, ZPOOL_CONFIG_NPARITY, vd->vdev_nparity);
        }
 
        if (vd->vdev_wholedisk != -1ULL)
-               VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK,
-                   vd->vdev_wholedisk) == 0);
+               fnvlist_add_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK,
+                   vd->vdev_wholedisk);
 
        if (vd->vdev_not_present)
-               VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT, 1) == 0);
+               fnvlist_add_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT, 1);
 
        if (vd->vdev_isspare)
-               VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_IS_SPARE, 1) == 0);
+               fnvlist_add_uint64(nv, ZPOOL_CONFIG_IS_SPARE, 1);
 
        if (!(flags & (VDEV_CONFIG_SPARE | VDEV_CONFIG_L2CACHE)) &&
            vd == vd->vdev_top) {
-               VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY,
-                   vd->vdev_ms_array) == 0);
-               VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_METASLAB_SHIFT,
-                   vd->vdev_ms_shift) == 0);
-               VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_ASHIFT,
-                   vd->vdev_ashift) == 0);
-               VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_ASIZE,
-                   vd->vdev_asize) == 0);
-               VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_IS_LOG,
-                   vd->vdev_islog) == 0);
+               fnvlist_add_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY,
+                   vd->vdev_ms_array);
+               fnvlist_add_uint64(nv, ZPOOL_CONFIG_METASLAB_SHIFT,
+                   vd->vdev_ms_shift);
+               fnvlist_add_uint64(nv, ZPOOL_CONFIG_ASHIFT, vd->vdev_ashift);
+               fnvlist_add_uint64(nv, ZPOOL_CONFIG_ASIZE,
+                   vd->vdev_asize);
+               fnvlist_add_uint64(nv, ZPOOL_CONFIG_IS_LOG, vd->vdev_islog);
                if (vd->vdev_removing)
-                       VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_REMOVING,
-                           vd->vdev_removing) == 0);
+                       fnvlist_add_uint64(nv, ZPOOL_CONFIG_REMOVING,
+                           vd->vdev_removing);
        }
 
        if (vd->vdev_dtl_smo.smo_object != 0)
-               VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_DTL,
-                   vd->vdev_dtl_smo.smo_object) == 0);
+               fnvlist_add_uint64(nv, ZPOOL_CONFIG_DTL,
+                   vd->vdev_dtl_smo.smo_object);
 
        if (vd->vdev_crtxg)
-               VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_CREATE_TXG,
-                   vd->vdev_crtxg) == 0);
+               fnvlist_add_uint64(nv, ZPOOL_CONFIG_CREATE_TXG, vd->vdev_crtxg);
 
        if (getstats) {
                vdev_stat_t vs;
                pool_scan_stat_t ps;
 
                vdev_get_stats(vd, &vs);
-               VERIFY(nvlist_add_uint64_array(nv, ZPOOL_CONFIG_VDEV_STATS,
-                   (uint64_t *)&vs, sizeof (vs) / sizeof (uint64_t)) == 0);
+               fnvlist_add_uint64_array(nv, ZPOOL_CONFIG_VDEV_STATS,
+                   (uint64_t *)&vs, sizeof (vs) / sizeof (uint64_t));
 
                /* provide either current or previous scan information */
                if (spa_scan_get_stats(spa, &ps) == 0) {
-                       VERIFY(nvlist_add_uint64_array(nv,
+                       fnvlist_add_uint64_array(nv,
                            ZPOOL_CONFIG_SCAN_STATS, (uint64_t *)&ps,
-                           sizeof (pool_scan_stat_t) / sizeof (uint64_t))
-                           == 0);
+                           sizeof (pool_scan_stat_t) / sizeof (uint64_t));
                }
        }
 
@@ -348,8 +338,8 @@ vdev_config_generate(spa_t *spa, vdev_t 
                }
 
                if (idx) {
-                       VERIFY(nvlist_add_nvlist_array(nv,
-                           ZPOOL_CONFIG_CHILDREN, child, idx) == 0);
+                       fnvlist_add_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
+                           child, idx);
                }
 
                for (c = 0; c < idx; c++)
@@ -361,26 +351,20 @@ vdev_config_generate(spa_t *spa, vdev_t 
                const char *aux = NULL;
 
                if (vd->vdev_offline && !vd->vdev_tmpoffline)
-                       VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_OFFLINE,
-                           B_TRUE) == 0);
-               if (vd->vdev_resilvering)
-                       VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_RESILVERING,
-                           B_TRUE) == 0);
+                       fnvlist_add_uint64(nv, ZPOOL_CONFIG_OFFLINE, B_TRUE);
+               if (vd->vdev_resilver_txg != 0)
+                       fnvlist_add_uint64(nv, ZPOOL_CONFIG_RESILVER_TXG,
+                           vd->vdev_resilver_txg);
                if (vd->vdev_faulted)
-                       VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_FAULTED,
-                           B_TRUE) == 0);
+                       fnvlist_add_uint64(nv, ZPOOL_CONFIG_FAULTED, B_TRUE);
                if (vd->vdev_degraded)
-                       VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_DEGRADED,
-                           B_TRUE) == 0);
+                       fnvlist_add_uint64(nv, ZPOOL_CONFIG_DEGRADED, B_TRUE);
                if (vd->vdev_removed)
-                       VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_REMOVED,
-                           B_TRUE) == 0);
+                       fnvlist_add_uint64(nv, ZPOOL_CONFIG_REMOVED, B_TRUE);
                if (vd->vdev_unspare)
-                       VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_UNSPARE,
-                           B_TRUE) == 0);
+                       fnvlist_add_uint64(nv, ZPOOL_CONFIG_UNSPARE, B_TRUE);
                if (vd->vdev_ishole)
-                       VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_IS_HOLE,
-                           B_TRUE) == 0);
+                       fnvlist_add_uint64(nv, ZPOOL_CONFIG_IS_HOLE, B_TRUE);
 
                switch (vd->vdev_stat.vs_aux) {
                case VDEV_AUX_ERR_EXCEEDED:
@@ -393,12 +377,11 @@ vdev_config_generate(spa_t *spa, vdev_t 
                }
 
                if (aux != NULL)
-                       VERIFY(nvlist_add_string(nv, ZPOOL_CONFIG_AUX_STATE,
-                           aux) == 0);
+                       fnvlist_add_string(nv, ZPOOL_CONFIG_AUX_STATE, aux);
 
                if (vd->vdev_splitting && vd->vdev_orig_guid != 0LL) {
-                       VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_ORIG_GUID,
-                           vd->vdev_orig_guid) == 0);
+                       fnvlist_add_uint64(nv, ZPOOL_CONFIG_ORIG_GUID,
+                           vd->vdev_orig_guid);
                }
        }
 

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_debug.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_debug.c     Thu Aug 
 8 23:24:36 2013        (r254111)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_debug.c     Thu Aug 
 8 23:38:31 2013        (r254112)
@@ -20,7 +20,7 @@
  */
 /*
  * Copyright (c) 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.
  */
 
 #include <sys/zfs_context.h>
@@ -94,3 +94,16 @@ zfs_dbgmsg(const char *fmt, ...)
        }
        mutex_exit(&zfs_dbgmsgs_lock);
 }
+
+void
+zfs_dbgmsg_print(const char *tag)
+{
+       zfs_dbgmsg_t *zdm;
+
+       (void) printf("ZFS_DBGMSG(%s):\n", tag);
+       mutex_enter(&zfs_dbgmsgs_lock);
+       for (zdm = list_head(&zfs_dbgmsgs); zdm;
+           zdm = list_next(&zfs_dbgmsgs, zdm))
+               (void) printf("%s\n", zdm->zdm_msg);
+       mutex_exit(&zfs_dbgmsgs_lock);
+}

Modified: head/sys/cddl/contrib/opensolaris/uts/common/sys/fs/zfs.h
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/sys/fs/zfs.h   Thu Aug  8 
23:24:36 2013        (r254111)
+++ head/sys/cddl/contrib/opensolaris/uts/common/sys/fs/zfs.h   Thu Aug  8 
23:38:31 2013        (r254112)
@@ -21,7 +21,7 @@
 
 /*
  * 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 2011 Nexenta Systems, Inc.  All rights reserved.
  * Copyright (c) 2012, Joyent, Inc. All rights reserved.
  * Copyright (c) 2012, Martin Matuska <m...@freebsd.org>. All rights reserved.
@@ -524,7 +524,7 @@ typedef struct zpool_rewind_policy {
 #define        ZPOOL_CONFIG_SPLIT_GUID         "split_guid"
 #define        ZPOOL_CONFIG_SPLIT_LIST         "guid_list"
 #define        ZPOOL_CONFIG_REMOVING           "removing"
-#define        ZPOOL_CONFIG_RESILVERING        "resilvering"
+#define        ZPOOL_CONFIG_RESILVER_TXG       "resilver_txg"
 #define        ZPOOL_CONFIG_COMMENT            "comment"
 #define        ZPOOL_CONFIG_SUSPENDED          "suspended"     /* not stored 
on disk */
 #define        ZPOOL_CONFIG_TIMESTAMP          "timestamp"     /* not stored 
on disk */
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