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# Test cp reads unwritten extents efficiently
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# Copyright (C) 2011-2012 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 <http://www.gnu.org/licenses/>.
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. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
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# FIXME: enable any part of this test that is still relevant,
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# or, if none are relevant (now that cp does not handle unwritten
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# extents), just remove the test altogether.
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skip_ 'disabled for now'
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fiemap_capable_ fiemap_chk ||
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skip_ 'this file system lacks FIEMAP support'
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# TODO: rather than requiring $(fallocate), possible add
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# this functionality to truncate --alloc
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fallocate --help >/dev/null || skip_ 'The fallocate utility is required'
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fallocate -l 1 -n falloc.test ||
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skip_ 'this file system lacks FALLOCATE support'
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# Require more space than we'll actually use, so that
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# tests run in parallel do not run out of space.
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# Otherwise, with inadequate space, simply running the following
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# fallocate command would induce a temporary disk-full condition,
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# which would cause failure of unrelated tests run in parallel.
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require_file_system_bytes_free_ 800000000
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fallocate -l 600MiB space.test ||
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skip_ 'this test needs at least 600MiB free space'
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# Disable this test on old BTRFS (e.g. Fedora 14)
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# which reports ordinary extents for unwritten ones.
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filefrag space.test || skip_ 'the 'filefrag' utility is missing'
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filefrag -v space.test | grep -F 'unwritten' > /dev/null ||
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skip_ 'this file system does not report empty extents as "unwritten"'
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# Ensure we read a large empty file quickly
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fallocate -l 300MiB empty.big || framework_failure_
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timeout 3 cp --sparse=always empty.big cp.test || fail=1
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test $(stat -c %s empty.big) = $(stat -c %s cp.test) || fail=1
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# Ensure we handle extents beyond file size correctly.
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# Note until we support fallocate, we will not maintain
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# the file allocation. FIXME: amend this test when fallocate is supported.
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fallocate -l 10MiB -n unwritten.withdata || framework_failure_
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dd count=10 if=/dev/urandom conv=notrunc iflag=fullblock of=unwritten.withdata
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cp unwritten.withdata cp.test || fail=1
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test $(stat -c %s unwritten.withdata) = $(stat -c %s cp.test) || fail=1
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cmp unwritten.withdata cp.test || fail=1
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rm unwritten.withdata cp.test
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# The following to generate unaccounted extents followed by a hole, is not
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# supported by ext4 at least. The ftruncate discards all extents not
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# accounted for in the size.
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# fallocate -l 10MiB -n unacc.withholes
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# dd count=10 if=/dev/urandom conv=notrunc iflag=fullblock of=unacc.withholes
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# truncate -s20M unacc.withholes
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# Ensure we handle a hole after empty extents correctly.
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# Since all extents are accounted for in the size,
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# we can maintain the allocation independently from
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# fallocate() support.
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fallocate -l 10MiB empty.withholes
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truncate -s 20M empty.withholes
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sectors_per_block=$(expr $(stat -c %o .) / 512)
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cp empty.withholes cp.test || fail=1
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test $(stat -c %s empty.withholes) = $(stat -c %s cp.test) || fail=1
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# These are usually equal but can vary by an IO block due to alignment
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alloc_diff=$(expr $(stat -c %b empty.withholes) - $(stat -c %b cp.test))
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alloc_diff=$(echo $alloc_diff | tr -d -- -) # abs()
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test $alloc_diff -le $sectors_per_block || fail=1
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# Again with SPARSE_ALWAYS
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cp --sparse=always empty.withholes cp.test || fail=1
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test $(stat -c %s empty.withholes) = $(stat -c %s cp.test) || fail=1
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# cp.test should take 0 space, but allowing for some systems
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# that store default extended attributes in data blocks
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test $(stat -c %b cp.test) -le $sectors_per_block || fail=1
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rm empty.withholes cp.test
added
removed
tests/cp/fiemap-empty.sh
