common/dmlogwrites

   1 ##/bin/bash
   2 #
   3 # Copyright (c) 2015 Facebook, Inc.  All Rights Reserved.
   4 #
   5 # This program is free software; you can redistribute it and/or
   6 # modify it under the terms of the GNU General Public License as
   7 # published by the Free Software Foundation.
   8 #
   9 # This program is distributed in the hope that it would be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program; if not, write the Free Software Foundation,
  16 # Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17 #
  18 #
  19 # common functions for setting up and tearing down a dm log-writes device
  20
  21 _require_log_writes()
  22 {
  23         [ -z "$LOGWRITES_DEV" -o ! -b "$LOGWRITES_DEV" ] && \
  24                 _notrun "This test requires a valid \$LOGWRITES_DEV"
  25
  26         _exclude_scratch_mount_option dax
  27         _require_dm_target log-writes
  28         _require_test_program "log-writes/replay-log"
  29 }
  30
  31 # Starting from v4.15-rc1, DAX support was added to dm-log-writes, but note
  32 # that it doesn't track the data that we write via the mmap(), so we can't do
  33 # any data integrity checking. We can only verify that the metadata writes for
  34 # the page faults happened, e.g. when mmap(2) with MAP_SYNC flag.
  35 #
  36 # Introduce a new helper to check if dm-log-writes target supports DAX
  37 # explicitly. But this is considered as a temporary workaround, we want to move
  38 # all the DAX check back to _require_log_writes when dm-log-writes gains full
  39 # DAX support and remove this helper.
  40 _require_log_writes_dax()
  41 {
  42         [ -z "$LOGWRITES_DEV" -o ! -b "$LOGWRITES_DEV" ] && \
  43                 _notrun "This test requires a valid \$LOGWRITES_DEV"
  44
  45         _require_dm_target log-writes
  46         _require_test_program "log-writes/replay-log"
  47
  48         local ret=0
  49         _log_writes_init
  50         _log_writes_mkfs > /dev/null 2>&1
  51         _log_writes_mount -o dax > /dev/null 2>&1
  52         # Check options to be sure. XFS ignores dax option
  53         # and goes on if dev underneath does not support dax.
  54         _fs_options $LOGWRITES_DMDEV | grep -qw "dax"
  55         ret=$?
  56         _log_writes_cleanup
  57         if [ $ret -ne 0 ]; then
  58                 _notrun "$LOGWRITES_DMDEV $FSTYP does not support -o dax"
  59         fi
  60 }
  61
  62 _log_writes_init()
  63 {
  64         local BLK_DEV_SIZE=`blockdev --getsz $SCRATCH_DEV`
  65         LOGWRITES_NAME=logwrites-test
  66         LOGWRITES_DMDEV=/dev/mapper/$LOGWRITES_NAME
  67         LOGWRITES_TABLE="0 $BLK_DEV_SIZE log-writes $SCRATCH_DEV $LOGWRITES_DEV"
  68         $DMSETUP_PROG create $LOGWRITES_NAME --table "$LOGWRITES_TABLE" || \
  69                 _fail "failed to create log-writes device"
  70         $DMSETUP_PROG mknodes > /dev/null 2>&1
  71 }
  72
  73 _log_writes_mark()
  74 {
  75         [ $# -ne 1 ] && _fail "_log_writes_mark takes one argument"
  76         $DMSETUP_PROG message $LOGWRITES_NAME 0 mark $1
  77 }
  78
  79 _log_writes_mkfs()
  80 {
  81         _scratch_options mkfs
  82         _mkfs_dev $SCRATCH_OPTIONS $LOGWRITES_DMDEV
  83         _log_writes_mark mkfs
  84 }
  85
  86 _log_writes_mount()
  87 {
  88         _scratch_options mount
  89         $MOUNT_PROG -t $FSTYP `_common_dev_mount_options $*` $SCRATCH_OPTIONS \
  90                 $LOGWRITES_DMDEV $SCRATCH_MNT
  91 }
  92
  93 _log_writes_unmount()
  94 {
  95         $UMOUNT_PROG $SCRATCH_MNT
  96 }
  97
  98 # _log_writes_replay_log <mark>
  99 #
 100 # This replays the log contained on $LOGWRITES_DEV onto $SCRATCH_DEV upto the
 101 # mark passed in.
 102 _log_writes_replay_log()
 103 {
 104         _mark=$1
 105
 106         $here/src/log-writes/replay-log --log $LOGWRITES_DEV --find \
 107                 --end-mark $_mark >> $seqres.full 2>&1
 108         [ $? -ne 0 ] && _fail "mark '$_mark' does not exist"
 109
 110         $here/src/log-writes/replay-log --log $LOGWRITES_DEV --replay $SCRATCH_DEV \
 111                 --end-mark $_mark >> $seqres.full 2>&1
 112         [ $? -ne 0 ] && _fail "replay failed"
 113 }
 114
 115 _log_writes_remove()
 116 {
 117         $DMSETUP_PROG remove $LOGWRITES_NAME > /dev/null 2>&1
 118         $DMSETUP_PROG mknodes > /dev/null 2>&1
 119 }
 120
 121 _log_writes_cleanup()
 122 {
 123         $UMOUNT_PROG $SCRATCH_MNT > /dev/null 2>&1
 124         # wait for device to be fully settled so that 'dmsetup remove' doesn't
 125         # fail due to EBUSY
 126         $UDEV_SETTLE_PROG >/dev/null 2>&1
 127         _log_writes_remove
 128 }