tests/shared/298

   1 #! /bin/bash
   2 # FS QA Test No. 298
   3 #
   4 # Test that filesystem sends discard requests only on free blocks
   5 #
   6 #-----------------------------------------------------------------------
   7 # Copyright (c) 2013 Red Hat, Inc., Tomas Racek <tracek@redhat.com>
   8 #
   9 # This program is free software; you can redistribute it and/or
  10 # modify it under the terms of the GNU General Public License as
  11 # published by the Free Software Foundation.
  12 #
  13 # This program is distributed in the hope that it would be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with this program; if not, write the Free Software Foundation,
  20 # Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  21 #-----------------------------------------------------------------------
  22 #
  23
  24 seq=`basename $0`
  25 seqres=$RESULT_DIR/$seq
  26 echo "QA output created by $seq"
  27
  28 status=1        # failure is the default!
  29 trap "_cleanup; exit \$status" 0 1 2 3 15
  30
  31 . ./common/rc
  32
  33 _supported_fs ext4 xfs
  34 _supported_os Linux
  35 _require_test
  36 _require_loop
  37 _require_fstrim
  38 _require_xfs_io_command "fiemap"
  39 _require_fs_space $TEST_DIR 307200
  40 [ "$FSTYP" = "ext4" ] && _require_dumpe2fs
  41
  42 _cleanup()
  43 {
  44         $UMOUNT_PROG $loop_dev &> /dev/null
  45         _destroy_loop_device $loop_dev
  46         if [ $status -eq 0 ]; then
  47                 rm -rf $tmp
  48                 rm $img_file
  49         fi
  50 }
  51
  52 get_holes()
  53 {
  54         $XFS_IO_PROG -F -c fiemap $1 | grep hole | $SED_PROG 's/.*\[\(.*\)\.\.\(.*\)\].*/\1 \2/'
  55 }
  56
  57 get_free_sectors()
  58 {
  59         case $FSTYP in
  60         ext4)
  61         $DUMPE2FS_PROG $img_file  2>&1 | grep " Free blocks" | cut -d ":" -f2- | \
  62                 tr ',' '\n' | $SED_PROG 's/^ //' | \
  63                 $AWK_PROG -v spb=$sectors_per_block 'BEGIN{FS="-"};
  64                      NF {
  65                         if($2 != "") # range of blocks
  66                                 print spb * $1, spb * ($2 + 1) - 1;
  67                         else            # just single block
  68                                 print spb * $1, spb * ($1 + 1) - 1;
  69                      }'
  70         ;;
  71         xfs)
  72         agsize=`xfs_info $loop_mnt | $SED_PROG -n 's/.*agsize=\(.*\) blks.*/\1/p'`
  73         # Convert free space (agno, block, length) to (start sector, end sector)
  74         $UMOUNT_PROG $loop_mnt
  75         $XFS_DB_PROG -r -c "freesp -d" $img_file | $SED_PROG '/^.*from/,$d'| \
  76                  $AWK_PROG -v spb=$sectors_per_block -v agsize=$agsize \
  77                 '{ print spb * ($1 * agsize + $2), spb * ($1 * agsize + $2 + $3) - 1 }'
  78         ;;
  79         esac
  80 }
  81
  82 merge_ranges()
  83 {
  84         # Merges consecutive ranges from two input files
  85         file1=$1
  86         file2=$2
  87
  88         tmp_file=$tmp/sectors.tmp
  89
  90         cat $file1 $file2 | sort -n > $tmp_file
  91
  92         read line < $tmp_file
  93         start=${line% *}
  94         end=${line#* }
  95
  96         # Continue from second line
  97         sed -i "1d" $tmp_file
  98         while read line; do
  99                 curr_start=${line% *}
 100                 curr_end=${line#* }
 101
 102                 if [ `expr $end + 1` -ge $curr_start ]; then
 103                         if [ $curr_end -gt $end ]; then
 104                                 end=$curr_end
 105                         fi
 106                 else
 107                         echo $start $end
 108                         start=$curr_start
 109                         end=$curr_end
 110                 fi
 111         done < $tmp_file
 112
 113         # Print last line
 114         echo $start $end
 115
 116         rm $tmp_file
 117 }
 118
 119 here=`pwd`
 120 tmp=`mktemp -d`
 121
 122 img_file=$TEST_DIR/$$.fs
 123 dd if=/dev/zero of=$img_file bs=1M count=300 &> /dev/null
 124
 125 loop_dev=$(_create_loop_device $img_file)
 126 loop_mnt=$tmp/loop_mnt
 127
 128 fiemap_ref="$tmp/reference"
 129 fiemap_after="$tmp/after"
 130 free_sectors="$tmp/free_sectors"
 131 merged_sectors="$tmp/merged_free_sectors"
 132
 133 mkdir $loop_mnt
 134
 135 [ "$FSTYP" = "xfs" ] && MKFS_OPTIONS="-f $MKFS_OPTIONS"
 136
 137 _mkfs_dev $loop_dev
 138 _mount $loop_dev $loop_mnt
 139
 140 echo -n "Generating garbage on loop..."
 141 # Goal is to fill it up, ignore any errors.
 142 for i in `seq 1 10`; do
 143         mkdir $loop_mnt/$i &> /dev/null
 144         cp -r $here/* $loop_mnt/$i &> /dev/null || break
 145 done
 146
 147 # Get reference fiemap, this can contain i.e. uninitialized inode table
 148 sync
 149 get_holes $img_file > $fiemap_ref
 150
 151 # Delete some files
 152 find $loop_mnt -type f -print | $AWK_PROG \
 153         'BEGIN {srand()}; {if(rand() > 0.7) print $1;}' | xargs rm
 154 echo "done."
 155
 156 echo -n "Running fstrim..."
 157 $FSTRIM_PROG $loop_mnt &> /dev/null
 158 echo "done."
 159
 160 echo -n "Detecting interesting holes in image..."
 161 # Get after-trim fiemap
 162 sync
 163 get_holes $img_file > $fiemap_after
 164 echo "done."
 165
 166 echo -n "Comparing holes to the reported space from FS..."
 167 # Get block size
 168 block_size=$(_get_block_size $loop_mnt/)
 169 sectors_per_block=`expr $block_size / 512`
 170
 171 # Obtain free space from filesystem
 172 get_free_sectors > $free_sectors
 173 # Merge original holes with free sectors
 174 merge_ranges $fiemap_ref $free_sectors > $merged_sectors
 175
 176 # Check that all holes after fstrim call were already present before or
 177 # that they match free space reported from FS
 178 while read line; do
 179         from=${line% *}
 180         to=${line#* }
 181         if ! $AWK_PROG -v s=$from -v e=$to \
 182                 '{ if ($1 <= s && e <= $2) found = 1};
 183                 END { if(found) exit 0; else exit 1}' $merged_sectors
 184         then
 185                 echo "Sectors $from-$to are not marked as free!"
 186                 exit
 187         fi
 188 done < $fiemap_after
 189 echo "done."
 190
 191 status=0
 192 exit