tests/zfs-tests/tests/functional/mount/umount_unlinked_drain.ksh

   1 #!/bin/ksh -p
   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 2018 Datto Inc.
  16 #
  17
  18 . $STF_SUITE/include/libtest.shlib
  19
  20 #
  21 # DESCRIPTION:
  22 # Test async unlinked drain to ensure mounting is not held up when there are
  23 # entries in the unlinked set. We also try to test that the list is able to be
  24 # filled up and drained at the same time.
  25 #
  26 # STRATEGY:
  27 # 1. Use zfs_unlink_suspend_progress tunable to disable freeing to build up
  28 #    the unlinked set
  29 # 2. Make sure mount happens even when there are entries in the unlinked set
  30 # 3. Drain and build up the unlinked list at the same time to test for races
  31 #
  32
  33 function cleanup
  34 {
  35         log_must set_tunable32 zfs_unlink_suspend_progress $default_unlink_sp
  36         for fs in $(seq 1 3); do
  37                 mounted $TESTDIR.$fs || zfs mount $TESTPOOL/$TESTFS.$fs
  38                 rm -f $TESTDIR.$fs/file-*
  39                 zfs set xattr=on $TESTPOOL/$TESTFS.$fs
  40         done
  41 }
  42
  43 function unlinked_size_is
  44 {
  45         MAX_ITERS=5 # iteration to do before we consider reported number stable
  46         iters=0
  47         last_usize=0
  48         while [[ $iters -le $MAX_ITERS ]]; do
  49                 kstat_file=$(grep -nrwl /proc/spl/kstat/zfs/$2/objset-0x* -e $3)
  50                 nunlinks=`cat $kstat_file | grep nunlinks | awk '{print $3}'`
  51                 nunlinked=`cat $kstat_file | grep nunlinked | awk '{print $3}'`
  52                 usize=$(($nunlinks - $nunlinked))
  53                 if [[ $iters == $MAX_ITERS && $usize == $1 ]]; then
  54                         return 0
  55                 fi
  56                 if [[ $usize == $last_usize ]]; then
  57                         (( iters++ ))
  58                 else
  59                         iters=0
  60                 fi
  61                 last_usize=$usize
  62         done
  63
  64         log_note "Unexpected unlinked set size: $last_usize, expected $1"
  65         return 1
  66 }
  67
  68
  69 UNLINK_SP_PARAM=/sys/module/zfs/parameters/zfs_unlink_suspend_progress
  70 default_unlink_sp=$(get_tunable zfs_unlink_suspend_progress)
  71
  72 log_onexit cleanup
  73
  74 log_assert "Unlinked list drain does not hold up mounting of fs"
  75
  76 for fs in 1 2 3; do
  77         set -A xattrs on sa off
  78         for xa in ${xattrs[@]}; do
  79                 # setup fs and ensure all deleted files got into unliked set
  80                 log_must mounted $TESTDIR.$fs
  81
  82                 log_must zfs set xattr=$xa $TESTPOOL/$TESTFS.$fs
  83
  84                 if [[ $xa == off ]]; then
  85                         for fn in $(seq 1 175); do
  86                                 log_must mkfile 128k $TESTDIR.$fs/file-$fn
  87                         done
  88                 else
  89                         log_must xattrtest -f 175 -x 3 -r -k -p $TESTDIR.$fs
  90                 fi
  91
  92                 log_must set_tunable32 zfs_unlink_suspend_progress 1
  93                 log_must unlinked_size_is 0 $TESTPOOL $TESTPOOL/$TESTFS.$fs
  94
  95                 # build up unlinked set
  96                 for fn in $(seq 1 100); do
  97                         log_must eval "rm $TESTDIR.$fs/file-$fn &"
  98                 done
  99                 log_must unlinked_size_is 100 $TESTPOOL $TESTPOOL/$TESTFS.$fs
 100
 101                 # test that we can mount fs without emptying the unlinked list
 102                 log_must zfs umount $TESTPOOL/$TESTFS.$fs
 103                 log_must unmounted $TESTDIR.$fs
 104                 log_must zfs mount $TESTPOOL/$TESTFS.$fs
 105                 log_must mounted $TESTDIR.$fs
 106                 log_must unlinked_size_is 100 $TESTPOOL $TESTPOOL/$TESTFS.$fs
 107
 108                 # confirm we can drain and add to unlinked set at the same time
 109                 log_must set_tunable32 zfs_unlink_suspend_progress 0
 110                 log_must zfs umount $TESTPOOL/$TESTFS.$fs
 111                 log_must zfs mount $TESTPOOL/$TESTFS.$fs
 112                 for fn in $(seq 101 175); do
 113                         log_must eval "rm $TESTDIR.$fs/file-$fn &"
 114                 done
 115                 log_must unlinked_size_is 0 $TESTPOOL $TESTPOOL/$TESTFS.$fs
 116         done
 117 done
 118
 119 log_pass "Confirmed unlinked list drain does not hold up mounting of fs"