common/defrag

   1 ##/bin/bash
   2 #
   3 # Copyright (c) 2009 Eric Sandeen
   4 # All Rights Reserved.
   5 #
   6 # This program is free software; you can redistribute it and/or
   7 # modify it under the terms of the GNU General Public License as
   8 # published by the Free Software Foundation.
   9 #
  10 # This program is distributed in the hope that it would be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program; if not, write the Free Software Foundation,
  17 # Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18 #
  19 #
  20 # Functions useful for defragmentation tests
  21 #
  22
  23 _require_defrag()
  24 {
  25     case "$FSTYP" in
  26     xfs)
  27         DEFRAG_PROG="$XFS_FSR_PROG"
  28         ;;
  29     ext4|ext4dev)
  30         DEFRAG_PROG="$E4DEFRAG_PROG"
  31         ;;
  32     btrfs)
  33         DEFRAG_PROG="$BTRFS_UTIL_PROG filesystem defragment"
  34         ;;
  35     *)
  36         _notrun "defragmentation not supported for fstype \"$FSTYP\""
  37         ;;
  38     esac
  39
  40     _require_command $DEFRAG_PROG
  41     _require_xfs_io_command "fiemap"
  42 }
  43
  44 _extent_count()
  45 {
  46         $XFS_IO_PROG -c "fiemap" $1  >> $seqres.full 2>&1
  47         $XFS_IO_PROG -c "fiemap" $1 | tail -n +2 | grep -v hole | wc -l| $AWK_PROG '{print $1}'
  48 }
  49
  50 _check_extent_count()
  51 {
  52         min=$1
  53         max=$2
  54         ext_cnt=$3
  55
  56         [ "$min" -gt "$ext_cnt" ] && _fail "Found $ext_cnt extents  min:$max"
  57         [ "$max" -ne -1 ] && [ "$ext_cnt" -gt "$max" ] && _fail "Found $ext_cnt max: $max"
  58
  59         if [ $max -ne $min ]; then
  60             echo "in_range($min, $max)"
  61         else
  62             echo "$ext_cnt"
  63         fi
  64         return $ext_cnt
  65 }
  66
  67 # Defrag file, check it, and remove it.
  68 _defrag()
  69 {
  70         min_before=0
  71         max_before=-1
  72         min_after=0
  73         max_after=-1
  74         csum=1
  75         mtime=1
  76
  77         while [ $# -gt 1 ]
  78         do
  79             case $1
  80                 in
  81                 --min_before)
  82                     [ -z "$2" ] && _fail "missing argument for --min_before"
  83                     min_before=$2
  84                     shift
  85                     ;;
  86                 --max_before)
  87                     [ -z "$2" ] && _fail "missing argument for --max_before"
  88                     max_before=$2
  89                     shift
  90                     ;;
  91                 --min_after)
  92                     [ -z "$2" ] && _fail "missing argument for --min_after"
  93                     min_after=$2
  94                     shift
  95                     ;;
  96                 --max_after)
  97                     [ -z "$2" ] && _fail "missing argument for --max_after"
  98                     max_after=$2
  99                     shift
 100                     ;;
 101                 --before)
 102                     [ -z "$2" ] && _fail "missing argument for --before"
 103                     min_before=$2
 104                     max_before=$2
 105                     shift
 106                     ;;
 107                 --after)
 108                     [ -z "$2" ] && _fail "missing argument for --after"
 109                     min_after=$2
 110                     max_after=$2
 111                     shift
 112                     ;;
 113                 --no_csum)
 114                     csum=
 115                     ;;
 116                 --no_mtime)
 117                     mtime=
 118                     ;;
 119                 --no_unlink)
 120                     no_unlink=1
 121                     ;;
 122                 *)
 123                     _fail "invalid argument to common/dump function: $1"
 124                     ;;
 125             esac
 126             shift
 127         done
 128
 129         echo -n "Before: "
 130         ext_before=$(_extent_count $1)
 131         _check_extent_count $min_before $max_before $ext_before
 132
 133         [ ! -z $csum ] && CSUM_BEFORE=`md5sum $1`
 134         STAT_BEFORE=`stat -c "a: %x m: %y c: %z" $1`
 135         $DEFRAG_PROG -v $1 >> $seqres.full 2>&1
 136
 137         _scratch_remount
 138         STAT_AFTER=`stat -c "a: %x m: %y c: %z" $1`
 139         [ ! -z $csum ] && CSUM_AFTER=`md5sum $1`
 140
 141         echo -n "After: "
 142         ext_after=$(_extent_count $1)
 143         _check_extent_count $min_after $max_after $ext_after
 144
 145         [ "$ext_before" -lt "$ext_after" ] && \
 146                 _fail "Number of extents increased after defragmentation," \
 147                       " before:$ext_before, after:$ext_after"
 148         if [ ! -z $csum ] && [ "$CSUM_BEFORE" != "$CSUM_AFTER" ]; then
 149                 _fail "file checksum changed post-defrag ($CSUM_BEFORE/$CSUM_AFTER)"
 150         fi
 151         if [ ! -z $mtime ] && [ "$STAT_BEFORE" != "$STAT_AFTER" ]; then
 152                 _fail "file timestamps changed post-defrag:\n$STAT_BEFORE\n$STAT_AFTER"
 153         fi
 154         [ -z $no_unlink ] && rm -f $1
 155 }
 156