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|
#!/usr/bin/env bash
# nbdkit
# Copyright Red Hat
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# * Neither the name of Red Hat nor the names of its contributors may be
# used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
# Demonstrate effect of multi-conn-exportname config flag
source ./functions.sh
set -e
set -x
set -u
requires_run
requires_plugin sh
requires_nbdsh_uri
requires nbdsh -c 'print(h.set_opt_mode)'
requires dd iflag=count_bytes </dev/null
files="test-multi-conn-name.out"
rm -f $files
cleanup_fn rm -f $files
fail=0
define plugin <<'EOF'
# This plugin purposefully maintains a per-connection cache.
#
# An optional parameter tightfua=true controls whether FUA acts on
# just the given region, or on all pending ops in the current connection.
#
# Note that an earlier cached write on one connection can overwrite a later
# FUA write on another connection - this is okay (the client is buggy if
# it ever sends overlapping writes without coordinating flushes and still
# expects any particular write to occur last).
get_export() {
case $1 in
*/*) export="$tmpdir/$(dirname $1)" conn=$(basename $1) ;;
*) export="$tmpdir" conn=$1 ;;
esac
}
fill_cache() {
if test ! -f "$export/$conn"; then
cp "$export/0" "$export/$conn"
fi
}
do_fua() {
case ,$3, in
*,fua,*)
if test -f "$tmpdir/strictfua"; then
dd of="$export/0" if="$export/$conn" skip=$2 seek=$2 count=$1 \
conv=notrunc iflag=count_bytes,skip_bytes oflag=seek_bytes
else
do_flush
fi ;;
esac
}
do_flush() {
if test -f "$export/$conn-replay"; then
while read cnt off; do
dd of="$export/0" if="$export/$conn" skip=$off seek=$off count=$cnt \
conv=notrunc iflag=count_bytes,skip_bytes oflag=seek_bytes
done < "$export/$conn-replay"
fi
rm -f "$export/$conn" "$export/$conn-replay"
}
case "$1" in
config)
case $2 in
strictfua)
case $3 in
true | on | 1) touch "$tmpdir/strictfua" ;;
false | off | 0) ;;
*) echo "unknown value for strictfua $3" >&2; exit 1 ;;
esac ;;
*) echo "unknown config key $2" >&2; exit 1 ;;
esac
;;
get_ready)
printf "%-32s" 'Initial contents' > "$tmpdir/0"
echo 0 > "$tmpdir/counter"
;;
get_size)
echo 32
;;
can_write | can_zero | can_trim | can_flush)
exit 0
;;
can_fua | can_cache)
echo native
;;
open)
read i < "$tmpdir/counter"
i=$((i+1))
echo $i > "$tmpdir/counter"
if test -z "$3"; then
echo $i
else
mkdir -p "$tmpdir/$3" || exit 1
cp "$tmpdir/0" "$tmpdir/$3/0"
echo "$3/$i"
fi
;;
pread)
get_export $2
fill_cache
dd if="$export/$conn" skip=$4 count=$3 iflag=count_bytes,skip_bytes
;;
cache)
get_export $2
fill_cache
;;
pwrite)
get_export $2
fill_cache
dd of="$export/$conn" seek=$4 conv=notrunc oflag=seek_bytes
echo $3 $4 >> "$export/$conn-replay"
do_fua $3 $4 $5
;;
zero | trim)
get_export $2
fill_cache
dd of="$export/$conn" if="/dev/zero" count=$3 seek=$4 conv=notrunc\
oflag=seek_bytes iflag=count_bytes
echo $3 $4 >> "$export/$conn-replay"
do_fua $3 $4 $5
;;
flush)
get_export $2
do_flush
;;
*)
exit 2
;;
esac
EOF
define script <<'EOF'
import os
uri = os.environ["uri"]
h = {}
for name in ["a", "b"]:
for conn in [1, 2]:
key = "%s%d" % (name, conn)
h[key] = nbd.NBD()
h[key].set_opt_mode(True)
h[key].connect_uri(uri)
h[key].set_export_name(name)
h[key].opt_go()
h["a1"].pread(1, 0)
h["a2"].pwrite(b"A", 0)
h["b1"].pread(1, 0)
h["b2"].pwrite(b"B", 0, nbd.CMD_FLAG_FUA)
print(bytes(h["a1"].pread(1, 0)))
print(bytes(h["b1"].pread(1, 0)))
EOF
export script
# Without the knob we flush all exports
nbdkit -vf sh - <<<"$plugin" --filter=multi-conn \
--run 'export uri; nbdsh -c "$script"' > test-multi-conn-name.out || fail=1
diff -u <(cat <<\EOF
b'A'
b'B'
EOF
) test-multi-conn-name.out || fail=1
# But with the knob, our flush is specific to the correct export
nbdkit -vf sh - <<<"$plugin" --filter=multi-conn \
multi-conn-exportname=true \
--run 'export uri; nbdsh -c "$script"' > test-multi-conn-name.out || fail=1
diff -u <(cat <<\EOF
b'I'
b'B'
EOF
) test-multi-conn-name.out || fail=1
exit $fail
|
