usr/src/test/zfs-tests/tests/functional/pool_checkpoint/checkpoint_discard_busy.ksh

   1 #!/usr/bin/ksh -p
   2
   3 #
   4 # This file and its contents are supplied under the terms of the
   5 # Common Development and Distribution License ("CDDL"), version 1.0.
   6 # You may only use this file in accordance with the terms of version
   7 # 1.0 of the CDDL.
   8 #
   9 # A full copy of the text of the CDDL should have accompanied this
  10 # source.  A copy of the CDDL is also available via the Internet at
  11 # http://www.illumos.org/license/CDDL.
  12 #
  13
  14 #
  15 # Copyright (c) 2017, 2018 by Delphix. All rights reserved.
  16 #
  17
  18 . $STF_SUITE/tests/functional/pool_checkpoint/pool_checkpoint.kshlib
  19
  20 #
  21 # DESCRIPTION:
  22 #       Discard checkpoint on a stressed pool. Ensure that we can
  23 #       export and import the pool while discarding but not run any
  24 #       operations that have to do with the checkpoint or change the
  25 #       pool's config.
  26 #
  27 # STRATEGY:
  28 #       1. Import pools that's slightly fragmented
  29 #       2. Take checkpoint
  30 #       3. Do more random writes to "free" checkpointed blocks
  31 #       4. Start discarding checkpoint
  32 #       5. Export pool while discarding checkpoint
  33 #       6. Attempt to rewind (should fail)
  34 #       7. Import pool and ensure that discard is still running
  35 #       8. Attempt to run checkpoint commands, or commands that
  36 #          change the pool's config (should fail)
  37 #
  38
  39 verify_runnable "global"
  40
  41 function test_cleanup
  42 {
  43         # reset memory limit to 16M
  44         mdb_ctf_set_int zfs_spa_discard_memory_limit 1000000
  45         cleanup_nested_pools
  46 }
  47
  48 setup_nested_pool_state
  49 log_onexit test_cleanup
  50
  51 #
  52 # Force discard to happen slower so it spans over
  53 # multiple txgs.
  54 #
  55 # Set memory limit to 128 bytes. Assuming that we
  56 # use 64-bit words for encoding space map entries,
  57 # ZFS will discard 8 non-debug entries per txg
  58 # (so at most 16 space map entries in debug-builds
  59 # due to debug entries).
  60 #
  61 # That should give us more than enough txgs to be
  62 # discarding the checkpoint for a long time as with
  63 # the current setup the checkpoint space maps should
  64 # have tens of thousands of entries.
  65 #
  66 mdb_ctf_set_int zfs_spa_discard_memory_limit 0t128
  67
  68 log_must zpool checkpoint $NESTEDPOOL
  69
  70 fragment_after_checkpoint_and_verify
  71
  72 log_must zpool checkpoint -d $NESTEDPOOL
  73
  74 log_must zpool export $NESTEDPOOL
  75
  76 #
  77 # Verify on-disk state while pool is exported
  78 #
  79 log_must zdb -e -p $FILEDISKDIR $NESTEDPOOL
  80
  81 #
  82 # Attempt to rewind on a pool that is discarding
  83 # a checkpoint.
  84 #
  85 log_mustnot zpool import -d $FILEDISKDIR --rewind-to-checkpoint $NESTEDPOOL
  86
  87 log_must zpool import -d $FILEDISKDIR $NESTEDPOOL
  88
  89 #
  90 # Discarding should continue after import, so
  91 # all the following operations should fail.
  92 #
  93 log_mustnot zpool checkpoint $NESTEDPOOL
  94 log_mustnot zpool checkpoint -d $NESTEDPOOL
  95 log_mustnot zpool remove $NESTEDPOOL $FILEDISK1
  96 log_mustnot zpool reguid $NESTEDPOOL
  97
  98 # reset memory limit to 16M
  99 mdb_ctf_set_int zfs_spa_discard_memory_limit 1000000
 100
 101 nested_wait_discard_finish
 102
 103 log_must zdb $NESTEDPOOL
 104
 105 log_pass "Can export/import but not rewind/checkpoint/discard or " \
 106     "change pool's config while discarding."