Illumos #3464

[mirror_zfs.git] / module / zfs / metaslab.c

diff --git a/module/zfs/metaslab.c b/module/zfs/metaslab.c
index cd1b6ce730f4843bbe5d41f9f4b24f39f4aa48f5..f9cb8cead815f50cbfff61bd2f25d5c71513fa66 100644 (file)
--- a/module/zfs/metaslab.c
+++ b/module/zfs/metaslab.c
@@ -1928,6 +1928,46 @@ void metaslab_fastwrite_unmark(spa_t *spa, const blkptr_t *bp)
        spa_config_exit(spa, SCL_VDEV, FTAG);
 }
 
+static void
+checkmap(space_map_t *sm, uint64_t off, uint64_t size)
+{
+       space_seg_t *ss;
+       avl_index_t where;
+
+       mutex_enter(sm->sm_lock);
+       ss = space_map_find(sm, off, size, &where);
+       if (ss != NULL)
+               panic("freeing free block; ss=%p", (void *)ss);
+       mutex_exit(sm->sm_lock);
+}
+
+void
+metaslab_check_free(spa_t *spa, const blkptr_t *bp)
+{
+       int i, j;
+
+       if ((zfs_flags & ZFS_DEBUG_ZIO_FREE) == 0)
+               return;
+
+       spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
+       for (i = 0; i < BP_GET_NDVAS(bp); i++) {
+               uint64_t vdid = DVA_GET_VDEV(&bp->blk_dva[i]);
+               vdev_t *vd = vdev_lookup_top(spa, vdid);
+               uint64_t off = DVA_GET_OFFSET(&bp->blk_dva[i]);
+               uint64_t size = DVA_GET_ASIZE(&bp->blk_dva[i]);
+               metaslab_t *ms = vd->vdev_ms[off >> vd->vdev_ms_shift];
+
+               if (ms->ms_map->sm_loaded)
+                       checkmap(ms->ms_map, off, size);
+
+               for (j = 0; j < TXG_SIZE; j++)
+                       checkmap(ms->ms_freemap[j], off, size);
+               for (j = 0; j < TXG_DEFER_SIZE; j++)
+                       checkmap(ms->ms_defermap[j], off, size);
+       }
+       spa_config_exit(spa, SCL_VDEV, FTAG);
+}
+
 #if defined(_KERNEL) && defined(HAVE_SPL)
 module_param(metaslab_debug, int, 0644);
 MODULE_PARM_DESC(metaslab_debug, "keep space maps in core to verify frees");