diff options
Diffstat (limited to 'tests/dd/nocache_eof.sh')
| -rwxr-xr-x | tests/dd/nocache_eof.sh | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/tests/dd/nocache_eof.sh b/tests/dd/nocache_eof.sh new file mode 100755 index 0000000..1804e5b --- /dev/null +++ b/tests/dd/nocache_eof.sh @@ -0,0 +1,97 @@ +#!/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 <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 |