#!/bin/sh # Ensure dd invalidates to EOF when appropriate # Copyright (C) 2017-2018 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 . . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src print_ver_ dd require_strace_ fadvise64,fadvise64_64 head -c1234567 /dev/zero > in.f || framework_failure_ # Check basic operation or skip. # We could check for 'Operation not supported' error here, # but that was seen to be brittle. HPUX returns ENOTTY for example. # So assume that if this basic operation fails, it's due to lack # of support by the system. dd if=in.f iflag=nocache count=0 || skip_ 'this file system lacks support for posix_fadvise()' strace_dd() { strace -o dd.strace -e fadvise64,fadvise64_64 dd status=none "$@" || 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