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#!/bin/sh
# Ensure dd invalidates to EOF when appropriate
# Copyright (C) 2017-2020 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ dd
require_strace_ fadvise64,fadvise64_64
head -c1234567 /dev/zero > in.f || framework_failure_
# Check basic operation or skip.
# We could check for 'Operation not supported' error here,
# but that was seen to be brittle. HPUX returns ENOTTY for example.
# So assume that if this basic operation fails, it's due to lack
# of support by the system.
dd if=in.f iflag=nocache count=0 ||
skip_ 'this file system lacks support for posix_fadvise()'
strace_dd() {
strace -o dd.strace -e fadvise64,fadvise64_64 dd status=none "$@" || fail=1
}
advised_to_eof() {
grep -F ' 0, POSIX_FADV_DONTNEED' dd.strace >/dev/null
}
# The commented fadvise64 calls are what are expected with
# a 4KiB page size and 128KiB IO_BUFSIZE.
strace_dd if=in.f of=out.f bs=1M oflag=nocache,sync
#fadvise64(1, 0, 1048576, POSIX_FADV_DONTNEED) = 0
#fadvise64(1, 1048576, 131072, POSIX_FADV_DONTNEED) = 0
#fadvise64(1, 1179648, 0, POSIX_FADV_DONTNEED) = 0
advised_to_eof || fail=1
strace_dd if=in.f count=0 iflag=nocache
#fadvise64(0, 0, 0, POSIX_FADV_DONTNEED) = 0
advised_to_eof || fail=1
strace_dd if=in.f of=/dev/null iflag=nocache skip=10 count=300
#fadvise64(0, 5120, 131072, POSIX_FADV_DONTNEED) = 0
#fadvise64(0, 136192, 22528, POSIX_FADV_DONTNEED) = 0
returns_ 1 advised_to_eof || fail=1
strace_dd if=in.f of=/dev/null iflag=nocache bs=1M count=3000
#fadvise64(0, 0, 1048576, POSIX_FADV_DONTNEED) = 0
#fadvise64(0, 1048576, 131072, POSIX_FADV_DONTNEED) = 0
#fadvise64(0, 1179648, 0, POSIX_FADV_DONTNEED) = 0
advised_to_eof || fail=1
strace_dd if=in.f of=/dev/null bs=1M count=1 iflag=nocache
#fadvise64(0, 0, 1048576, POSIX_FADV_DONTNEED) = 0
returns_ 1 advised_to_eof || fail=1
strace_dd if=in.f of=out.f bs=1M iflag=nocache oflag=nocache,sync
#fadvise64(0, 0, 1048576, POSIX_FADV_DONTNEED) = 0
#fadvise64(1, 0, 1048576, POSIX_FADV_DONTNEED) = 0
#fadvise64(0, 1048576, 131072, POSIX_FADV_DONTNEED) = 0
#fadvise64(1, 1048576, 131072, POSIX_FADV_DONTNEED) = 0
#fadvise64(0, 1179648, 0, POSIX_FADV_DONTNEED) = 0
#fadvise64(1, 1179648, 0, POSIX_FADV_DONTNEED) = 0
advised_to_eof || fail=1
# Ensure sub page size offsets are handled.
# I.e., only page aligned offsets are sent to fadvise.
if ! strace -o dd.strace -e fadvise64,fadvise64_64 dd status=none \
if=in.f of=out.f bs=1M oflag=direct seek=512 oflag=seek_bytes; then
warn_ '512 byte aligned O_DIRECT is not supported on this (file) system'
# The current file system may not support O_DIRECT,
# or older XFS had a page size alignment requirement
else
#The first call is redundant but inconsequential
#fadvise64(1, 1048576, 0, POSIX_FADV_DONTNEED) = 0
#fadvise64(1, 1048576, 0, POSIX_FADV_DONTNEED) = 0
advised_to_eof || fail=1
strace_dd if=in.f of=out.f bs=1M oflag=direct
#fadvise64(1, 1048576, 0, POSIX_FADV_DONTNEED) = 0
#fadvise64(1, 1048576, 0, POSIX_FADV_DONTNEED) = 0
advised_to_eof || fail=1
fi
Exit $fail
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