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Nits: > For 64K sector size, the BLKS is 512, and BLKS is 128 (one 64K sector). ^^ NBLKS > $FALLOC is the correct value of 64K (10K rounded up to 64K). > Not sure what you meant here. More below. > diff --git a/tests/btrfs/002 b/tests/btrfs/002 > index f223cc60..0c231b89 100755 > --- a/tests/btrfs/002 > +++ b/tests/btrfs/002 > @@ -70,19 +70,14 @@ _read_modify_write() > _fill_blk() > { > local FSIZE > - local BLKS > - local NBLK > - local FALLOC > - local WS > + local NEWSIZE > > for i in `find /$1 -type f` > do > FSIZE=`stat -t $i | cut -d" " -f2` > - BLKS=`stat -c "%B" $i` > - NBLK=`stat -c "%b" $i` > - FALLOC=$(($BLKS * $NBLK)) > - WS=$(($FALLOC - $FSIZE)) > - _ddt of=$i oseek=$FSIZE obs=$WS count=1 status=noxfer 2>/dev/null & > + NEWSIZE=$(( ($FSIZE + $blksize -1 ) / $blksize * $blksize )) Please add extra ( ) otherwise it is very confusing. NEWSIZE=$(( (($FSIZE + $blksize -1 ) / $blksize) * $blksize )) > + > + $XFS_IO_PROG -c "pwrite -i /dev/urandom $FSIZE $(( $NEWSIZE - $FSIZE ))" $i > /dev/null & Reviewed-by: Anand Jain Thanks, Anand