tests/dd/nocache

   1 #!/bin/sh
   2 # Ensure dd handles the 'nocache' flag
   3
   4 # Copyright (C) 2011-2012 Free Software Foundation, Inc.
   5
   6 # This program is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 . "${srcdir=.}/init.sh"; path_prepend_ ../src
  20 print_ver_ dd
  21
  22 # This should not call posix_fadvise
  23 dd iflag=nocache oflag=nocache if=/dev/null of=/dev/null || fail=1
  24
  25 # We should get an error for trying to process a pipe
  26 dd count=0 | dd iflag=nocache count=0 && fail=1
  27
  28 # O_DIRECT is orthogonal to drop cache so mutually exclusive
  29 dd iflag=nocache,direct if=/dev/null && fail=1
  30
  31 # The rest ensure that the documented uses cases
  32 # proceed without error
  33 for f in ifile ofile; do
  34   dd if=/dev/zero of=$f conv=fdatasync count=100 || framework_failure_
  35 done
  36
  37 # Advise to drop cache for whole file
  38 if ! dd if=ifile iflag=nocache count=0 2>err; then
  39   # We could check for 'Operation not supported' in err here,
  40   # but that was seen to be brittle. HPUX returns ENOTTY for example.
  41   # So assume that if this basic operation fails, it's due to lack
  42   # of support by the system.
  43   warn_ 'skipping part; this file system lacks support for posix_fadvise()'
  44   skip=1
  45 fi
  46
  47 if test "$skip" != 1; then
  48   # Ensure drop cache for whole file
  49   dd of=ofile oflag=nocache conv=notrunc,fdatasync count=0 || fail=1
  50
  51   # Drop cache for part of file
  52   dd if=ifile iflag=nocache skip=10 count=10 of=/dev/null || fail=1
  53
  54   # Stream data just using readahead cache
  55   dd if=ifile of=ofile iflag=nocache oflag=nocache || fail=1
  56 fi
  57
  58 Exit $fail