1 #!/usr/bin/bash -p
   2 #
   3 # CDDL HEADER START
   4 #
   5 # The contents of this file are subject to the terms of the
   6 # Common Development and Distribution License (the "License").
   7 # You may not use this file except in compliance with the License.
   8 #
   9 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10 # or http://www.opensolaris.org/os/licensing.
  11 # See the License for the specific language governing permissions
  12 # and limitations under the License.
  13 #
  14 # When distributing Covered Code, include this CDDL HEADER in each
  15 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16 # If applicable, add the following below this CDDL HEADER, with the
  17 # fields enclosed by brackets "[]" replaced with your own identifying
  18 # information: Portions Copyright [yyyy] [name of copyright owner]
  19 #
  20 # CDDL HEADER END
  21 #
  22 
  23 #
  24 # Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  25 # Use is subject to license terms.
  26 #
  27 
  28 #
  29 # Copyright (c) 2013 by Delphix. All rights reserved.
  30 #
  31 
  32 . $STF_SUITE/include/libtest.shlib
  33 . $STF_SUITE/tests/functional/reservation/reservation.shlib
  34 
  35 #
  36 # DESCRIPTION:
  37 #
  38 # Setting a reservation reserves a defined minimum amount of space for
  39 # a dataset, and prevents other datasets using that space. Verify that
  40 # reducing the reservation on a filesystem allows other datasets in
  41 # the pool to use that space.
  42 #
  43 # STRATEGY:
  44 # 1) Create multiple filesystems
  45 # 2) Set reservations on all bar one of the filesystems
  46 # 3) Fill up the one non-reserved filesystem
  47 # 4) Reduce one of the reservations and verify can write more
  48 # data into the non-reserved filesystem
  49 #
  50 
  51 verify_runnable "both"
  52 
  53 log_assert "Verify reducing reservation allows other datasets to use space"
  54 
  55 function cleanup
  56 {
  57         typeset -i loop=0
  58         while (($loop < $RESV_NUM_FS)); do
  59                 datasetexists $TESTPOOL/${TESTFS}$loop && \
  60                     log_must $ZFS destroy -f $TESTPOOL/${TESTFS}$loop
  61 
  62                 [[ -d ${TESTDIR}$loop ]] && log_must $RM -r ${TESTDIR}$loop
  63 
  64                 ((loop = loop + 1))
  65         done
  66 }
  67 
  68 log_onexit cleanup
  69 
  70 log_must create_multiple_fs $RESV_NUM_FS $TESTPOOL/$TESTFS $TESTDIR
  71 
  72 space_avail=`get_prop available $TESTPOOL`
  73 space_used=`get_prop used $TESTPOOL`
  74 
  75 #
  76 # To make sure this test doesn't take too long to execute on
  77 # large pools, we calculate a reservation setting which when
  78 # applied to all bar one of the filesystems (RESV_NUM_FS-1) will
  79 # ensure we have RESV_FREE_SPACE left free in the pool, which we will
  80 # be able to quickly fill.
  81 #
  82 resv_space_avail=`expr $space_avail - $RESV_FREE_SPACE`
  83 num_resv_fs=`expr $RESV_NUM_FS - 1` # Number of FS to which resv will be applied
  84 resv_size_set=`expr $resv_space_avail / $num_resv_fs`
  85 
  86 #
  87 # We set the reservations now, rather than when we created the filesystems
  88 # to allow us to take into account space used by the filsystem metadata
  89 #
  90 # Note we don't set a reservation on the first filesystem we created,
  91 # hence num=1 rather than zero below.
  92 #
  93 typeset -i num=1
  94 while (($num < $RESV_NUM_FS)); do
  95         log_must $ZFS set reservation=$resv_size_set $TESTPOOL/$TESTFS$num
  96         ((num = num + 1))
  97 done
  98 
  99 space_avail_still=`get_prop available $TESTPOOL`
 100 
 101 fill_size=`expr $space_avail_still + $RESV_TOLERANCE`
 102 write_count=`expr $fill_size / $BLOCK_SIZE`
 103 
 104 # Now fill up the first filesystem (which doesn't have a reservation set
 105 # and thus will use up whatever free space is left in the pool).
 106 num=0
 107 log_note "Writing to $TESTDIR$num/$TESTFILE1"
 108 
 109 $FILE_WRITE -o create -f $TESTDIR$num/$TESTFILE1 -b $BLOCK_SIZE \
 110     -c $write_count -d 0
 111 ret=$?
 112 if (($ret != $ENOSPC)); then
 113         log_fail "Did not get ENOSPC as expected (got $ret)."
 114 fi
 115 
 116 # Remove the reservation on one of the other filesystems and verify
 117 # can write more data to the original non-reservation filesystem.
 118 num=1
 119 log_must $ZFS set reservation=none $TESTPOOL/${TESTFS}$num
 120 num=0
 121 log_must $FILE_WRITE -o create -f ${TESTDIR}$num/$TESTFILE2 -b $PAGESIZE \
 122     -c 1000 -d 0
 123 
 124 log_pass "reducing reservation allows other datasets to use space"