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#!/bin/ksh -p
#
# This file and its contents are supplied under the terms of the
# Common Development and Distribution License ("CDDL"), version 1.0.
# You may only use this file in accordance with the terms of version
# 1.0 of the CDDL.
#
# A full copy of the text of the CDDL should have accompanied this
# source. A copy of the CDDL is also available via the Internet at
# http://www.illumos.org/license/CDDL.
#
#
# Copyright (c) 2017 by Delphix. All rights reserved.
#
. $STF_SUITE/tests/functional/pool_checkpoint/pool_checkpoint.kshlib
#
# DESCRIPTION:
# Ensure that we don't reuse checkpointed blocks when the
# pool hits ENOSPC errors because of the slop space limit.
# This test also ensures that the DSL layer correctly takes
# into account the space used by the checkpoint when deciding
# whether to allow operations based on the reserved slop
# space.
#
# STRATEGY:
# 1. Create pool with one disk of 1G size
# 2. Create a file with random data of 700M in size.
# leaving ~200M left in pool capacity.
# 3. Checkpoint the pool
# 4. Remove the file. All of its blocks should stay around
# in ZFS as they are part of the checkpoint.
# 5. Create a new empty file and attempt to write ~300M
# of data to it. This should fail, as the reserved
# SLOP space for the pool should be ~128M, and we should
# be hitting that limit getting ENOSPC.
# 6. Use zdb to traverse and checksum all the checkpointed
# data to ensure its integrity.
# 7. Export the pool and rewind to ensure that everything
# is actually there as expected.
#
function test_cleanup
{
poolexists $NESTEDPOOL && destroy_pool $NESTEDPOOL
set_tunable32 SPA_ASIZE_INFLATION 24
cleanup_test_pool
}
verify_runnable "global"
setup_test_pool
log_onexit test_cleanup
log_must set_tunable32 SPA_ASIZE_INFLATION 4
log_must zfs create $DISKFS
log_must mkfile $FILEDISKSIZE $FILEDISK1
log_must zpool create $NESTEDPOOL $FILEDISK1
log_must zfs create -o compression=lz4 -o recordsize=8k $NESTEDFS0
log_must dd if=/dev/urandom of=$NESTEDFS0FILE bs=1M count=700
FILE0INTRO=$(head -c 100 $NESTEDFS0FILE)
log_must zpool checkpoint $NESTEDPOOL
log_must rm $NESTEDFS0FILE
#
# only for debugging purposes
#
log_must zpool list $NESTEDPOOL
log_mustnot dd if=/dev/urandom of=$NESTEDFS0FILE bs=1M count=300
#
# only for debugging purposes
#
log_must zpool list $NESTEDPOOL
log_must zdb -kc $NESTEDPOOL
log_must zpool export $NESTEDPOOL
log_must zpool import -d $FILEDISKDIR --rewind-to-checkpoint $NESTEDPOOL
log_must [ "$(head -c 100 $NESTEDFS0FILE)" = "$FILE0INTRO" ]
log_must zdb $NESTEDPOOL
log_pass "Do not reuse checkpointed space at low capacity."
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