97 lines
3.6 KiB
Bash
Executable file
97 lines
3.6 KiB
Bash
Executable file
#!/bin/sh
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# Ensure dd invalidates to EOF when appropriate
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# Copyright (C) 2017-2025 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
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print_ver_ dd
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require_strace_ fadvise64,fadvise64_64
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head -c1234567 /dev/zero > in.f || framework_failure_
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# Check basic operation or skip.
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# We could check for 'Operation not supported' error here,
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# but that was seen to be brittle. HPUX returns ENOTTY for example.
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# So assume that if this basic operation fails, it's due to lack
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# of support by the system.
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dd if=in.f iflag=nocache count=0 ||
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skip_ 'this file system lacks support for posix_fadvise()'
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strace_dd() {
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strace -o dd.strace -e fadvise64,fadvise64_64 dd status=none "$@" || fail=1
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}
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advised_to_eof() {
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grep -F ' 0, POSIX_FADV_DONTNEED' dd.strace >/dev/null
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}
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# The commented fadvise64 calls are what are expected with
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# a 4KiB page size and 128KiB IO_BUFSIZE.
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strace_dd if=in.f of=out.f bs=1M oflag=nocache,sync
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#fadvise64(1, 0, 1048576, POSIX_FADV_DONTNEED) = 0
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#fadvise64(1, 1048576, 131072, POSIX_FADV_DONTNEED) = 0
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#fadvise64(1, 1179648, 0, POSIX_FADV_DONTNEED) = 0
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advised_to_eof || fail=1
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strace_dd if=in.f count=0 iflag=nocache
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#fadvise64(0, 0, 0, POSIX_FADV_DONTNEED) = 0
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advised_to_eof || fail=1
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strace_dd if=in.f of=/dev/null iflag=nocache skip=10 count=300
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#fadvise64(0, 5120, 131072, POSIX_FADV_DONTNEED) = 0
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#fadvise64(0, 136192, 22528, POSIX_FADV_DONTNEED) = 0
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returns_ 1 advised_to_eof || fail=1
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strace_dd if=in.f of=/dev/null iflag=nocache bs=1M count=3000
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#fadvise64(0, 0, 1048576, POSIX_FADV_DONTNEED) = 0
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#fadvise64(0, 1048576, 131072, POSIX_FADV_DONTNEED) = 0
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#fadvise64(0, 1179648, 0, POSIX_FADV_DONTNEED) = 0
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advised_to_eof || fail=1
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strace_dd if=in.f of=/dev/null bs=1M count=1 iflag=nocache
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#fadvise64(0, 0, 1048576, POSIX_FADV_DONTNEED) = 0
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returns_ 1 advised_to_eof || fail=1
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strace_dd if=in.f of=out.f bs=1M iflag=nocache oflag=nocache,sync
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#fadvise64(0, 0, 1048576, POSIX_FADV_DONTNEED) = 0
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#fadvise64(1, 0, 1048576, POSIX_FADV_DONTNEED) = 0
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#fadvise64(0, 1048576, 131072, POSIX_FADV_DONTNEED) = 0
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#fadvise64(1, 1048576, 131072, POSIX_FADV_DONTNEED) = 0
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#fadvise64(0, 1179648, 0, POSIX_FADV_DONTNEED) = 0
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#fadvise64(1, 1179648, 0, POSIX_FADV_DONTNEED) = 0
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advised_to_eof || fail=1
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# Ensure sub page size offsets are handled.
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# I.e., only page aligned offsets are sent to fadvise.
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if ! strace -o dd.strace -e fadvise64,fadvise64_64 dd status=none \
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if=in.f of=out.f bs=1M oflag=direct oseek=512B; then
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warn_ '512 byte aligned O_DIRECT is not supported on this (file) system'
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# The current file system may not support O_DIRECT,
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# or older XFS had a page size alignment requirement
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else
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#The first call is redundant but inconsequential
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#fadvise64(1, 1048576, 0, POSIX_FADV_DONTNEED) = 0
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#fadvise64(1, 1048576, 0, POSIX_FADV_DONTNEED) = 0
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advised_to_eof || fail=1
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strace_dd if=in.f of=out.f bs=1M oflag=direct
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#fadvise64(1, 1048576, 0, POSIX_FADV_DONTNEED) = 0
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#fadvise64(1, 1048576, 0, POSIX_FADV_DONTNEED) = 0
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advised_to_eof || fail=1
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fi
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Exit $fail
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