#! /usr/local/bin/ksh93 -p
#
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# $FreeBSD: releng/12.1/tests/sys/cddl/zfs/tests/reservation/reservation_015_pos.ksh 329867 2018-02-23 16:31:00Z asomers $

#
# Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#
# ident	"@(#)reservation_015_pos.ksh	1.4	09/08/06 SMI"
#

. $STF_SUITE/include/libtest.kshlib
. $STF_SUITE/tests/reservation/reservation.kshlib

###############################################################################
#
# __stc_assertion_start
#
# ID: reservation_015_pos
#
# DESCRIPTION:
#
# In pool with a full filesystem and a regular volume with an implicit 
# reservation, setting the reservation on the volume to 'none' should allow 
# more data to be written to the filesystem.
#
#
# STRATEGY:
# 1) Create a regular non-sparse volume (which implicitly sets the reservation 
#    property to a value equal to the volume size)
# 2) Create a filesystem at the same level
# 3) Fill up the filesystem
# 4) Set the reservation on the volume to 'none'
# 5) Verify can write more data to the filesystem
#
# TESTABILITY: explicit
#
# TEST_AUTOMATION_LEVEL: automated
#
# CODING_STATUS: COMPLETED (2005-07-19)
#
# __stc_assertion_end
#
################################################################################

verify_runnable "global"

log_assert "Setting volume reservation to 'none' allows more data to" \
	" be written to top level filesystem"

space_avail=`get_prop available $TESTPOOL`

#
# To make sure this test doesn't take too long to execute on
# large pools, we calculate a volume size which when applied 
# to the volume will ensure we have RESV_FREE_SPACE 
# left free in the pool which we can quickly fill.
#
# For the volume itself, set a reservation to 95% of available
# space to allow space for metadata.
#
(( resv_size_set = space_avail * 95 / 100 ))
resv_size_set=$(floor_volsize $resv_size_set $BLOCK_SIZE)

log_must $ZFS create -b $BLOCK_SIZE -V $resv_size_set $TESTPOOL/$TESTVOL

# Create a secondary filesystem to soak up what's left to get
# to RESV_FREE_SPACE for the pool.
space_avail_still=`get_prop available $TESTPOOL`
(( zfs_res = space_avail_still - RESV_FREE_SPACE ))
log_must $ZFS create -o refreservation=$zfs_res $TESTPOOL/$TESTFS2

space_avail_still=`get_prop available $TESTPOOL`

fill_size=`expr $space_avail_still + $RESV_TOLERANCE`
write_count=`expr $fill_size / $BLOCK_SIZE`

# Now fill up the filesystem (which doesn't have a reservation set
# and thus will use up whatever free space is left in the pool).
$FILE_WRITE -o create -f $TESTDIR/$TESTFILE1 -b $BLOCK_SIZE \
        -c $write_count -d 0
ret=$?

if (( $ret != $ENOSPC )); then
	log_fail "Did not get ENOSPC as expected (got $ret)."
fi

log_must $ZFS set refreservation=none $TESTPOOL/$TESTVOL

log_must $FILE_WRITE -o create -f $TESTDIR/$TESTFILE2 -b $BLOCK_SIZE \
        -c 1000 -d 0

log_pass "Setting top level volume reservation to 'none' allows more " \
	"data to be written to the top level filesystem"
