usr/src/test/zfs-tests/tests/functional/nopwrite/nopwrite_promoted_clone.ksh

   1 #!/usr/bin/ksh
   2
   3 #
   4 # This file and its contents are supplied under the terms of the
   5 # Common Development and Distribution License ("CDDL"), version 1.0.
   6 # You may only use this file in accordance with the terms of version
   7 # 1.0 of the CDDL.
   8 #
   9 # A full copy of the text of the CDDL should have accompanied this
  10 # source.  A copy of the CDDL is also available via the Internet at
  11 # http://www.illumos.org/license/CDDL.
  12 #
  13
  14 #
  15 # Copyright (c) 2012, 2016 by Delphix. All rights reserved.
  16 #
  17
  18 . $STF_SUITE/include/libtest.shlib
  19 . $STF_SUITE/tests/functional/nopwrite/nopwrite.shlib
  20
  21 #
  22 # Description:
  23 # Verify that nopwrite still works for a dataset that becomes a clone via
  24 # promotion.
  25 #
  26 # Strategy:
  27 # 1. Create a clone suitable for nopwrite.
  28 # 2. Disable compression and checksum on the clone, and promote it.
  29 # 3. Overwrite the file in the clone (former origin fs) and verify it
  30 # consumes no additional space.
  31 #
  32
  33 verify_runnable "global"
  34 origin="$TESTPOOL/$TESTFS"
  35 log_onexit cleanup
  36
  37 function cleanup
  38 {
  39         datasetexists $origin && log_must zfs destroy -R $TESTPOOL/clone
  40         log_must zfs create -o mountpoint=$TESTDIR $origin
  41 }
  42
  43 log_assert "nopwrite works on a dataset that becomes a clone via promotion."
  44
  45 log_must zfs set compress=on $origin
  46 log_must zfs set checksum=sha256 $origin
  47 dd if=/dev/urandom of=$TESTDIR/file bs=1024k count=$MEGS conv=notrunc \
  48     >/dev/null 2>&1 || log_fail "dd into $TESTDIR/file failed."
  49 zfs snapshot $origin@a || log_fail "zfs snap failed"
  50 log_must zfs clone $origin@a $TESTPOOL/clone
  51 log_must zfs set compress=off $TESTPOOL/clone
  52 log_must zfs set checksum=off $TESTPOOL/clone
  53 log_must zfs promote $TESTPOOL/clone
  54 dd if=/$TESTPOOL/clone/file of=/$TESTDIR/file bs=1024k count=$MEGS \
  55     conv=notrunc >/dev/null 2>&1 || log_fail "dd failed."
  56 log_must verify_nopwrite $TESTPOOL/clone $TESTPOOL/clone@a $origin
  57
  58 log_pass "nopwrite works on a dataset that becomes a clone via promotion."