From 91540ef980110f78161893f98d946e2afa0c1f4a Mon Sep 17 00:00:00 2001 From: Filipe Manana Date: Mon, 5 Nov 2018 11:14:45 +0000 Subject: [PATCH] generic: test attempt to dedup eof block into the middle of a file Test that deduplication of an entire file that has a size that is not aligned to the filesystem's block size into the middle of a different file does not corrupt the destination's file data by reflinking the last (eof) block. This test is motivated by a bug recently found that affects both Btrfs and XFS, and is fixed by the following commits/patches for the linux kernel: 07d19dc9fbe9 ("vfs: avoid problematic remapping requests into partial EOF block") dceeb47b0ed6 ("xfs: fix data corruption w/ unaligned dedupe ranges") de02b9f6bb65 ("Btrfs: fix data corruption when deduplicating between different files") Btrfs: fix infinite loop on inode eviction after deduplication of eof block The VFS patch was added to kernel 4.20-rc1 and the XFS and first Btrfs patches were added to kernel 4.19. The second patch for Btrfs is very recent and it is not yet in Linus' tree. Signed-off-by: Filipe Manana Reviewed-by: Eryu Guan Signed-off-by: Eryu Guan --- tests/generic/517 | 98 +++++++++++++++++++++++++++++++++++++++++++ tests/generic/517.out | 45 ++++++++++++++++++++ tests/generic/group | 1 + 3 files changed, 144 insertions(+) create mode 100755 tests/generic/517 create mode 100644 tests/generic/517.out diff --git a/tests/generic/517 b/tests/generic/517 new file mode 100755 index 00000000..601bb24e --- /dev/null +++ b/tests/generic/517 @@ -0,0 +1,98 @@ +#! /bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2018 SUSE Linux Products GmbH. All Rights Reserved. +# +# FS QA Test No. 517 +# +# Test that deduplication of an entire file that has a size that is not aligned +# to the filesystem's block size into the middle of a different file does not +# corrupt the destination's file data by reflinking the last (eof) block. +# +seq=`basename $0` +seqres=$RESULT_DIR/$seq +echo "QA output created by $seq" +tmp=/tmp/$$ +status=1 # failure is the default! +trap "_cleanup; exit \$status" 0 1 2 3 15 + +_cleanup() +{ + cd / + rm -f $tmp.* +} + +# get standard environment, filters and checks +. ./common/rc +. ./common/filter +. ./common/reflink + +# real QA test starts here +_supported_fs generic +_supported_os Linux +_require_scratch_dedupe + +rm -f $seqres.full + +_scratch_mkfs >>$seqres.full 2>&1 +_scratch_mount + +# The first byte with a value of 0xae starts at an offset (2518890) which is not +# a multiple of the block size. +$XFS_IO_PROG -f \ + -c "pwrite -S 0x6b 0 2518890" \ + -c "pwrite -S 0xae 2518890 102398" \ + $SCRATCH_MNT/foo | _filter_xfs_io + +# Create a second file with a length not aligned to the block size, whose bytes +# all have the value 0x6b, so that its extent(s) can be deduplicated with the +# first file. +$XFS_IO_PROG -f -c "pwrite -S 0x6b 0 557771" $SCRATCH_MNT/bar | _filter_xfs_io + +# The file is filled with bytes having the value 0x6b from offset 0 to offset +# 2518889 and with the value 0xae from offset 2518890 to offset 2621287. +echo "File content before first deduplication:" +od -t x1 $SCRATCH_MNT/foo + +# Now deduplicate the entire second file into a range of the first file that +# also has all bytes with the value 0x6b. The destination range's end offset +# must not be aligned to the block size and must be less then the offset of +# the first byte with the value 0xae (byte at offset 2518890). +$XFS_IO_PROG -c "dedupe $SCRATCH_MNT/bar 0 1957888 557771" $SCRATCH_MNT/foo \ + | _filter_xfs_io + +# We should have exactly the same data we had before we asked for deduplication. +echo "File content after first deduplication and before unmounting:" +od -A d -t x1 $SCRATCH_MNT/foo + +# Unmount the filesystem and mount it again. This guarantees any file data in +# the page cache is dropped. +_scratch_cycle_mount + +# We should have exactly the same data we had before we asked for deduplication. +echo "File content after first unmount:" +od -A d -t x1 $SCRATCH_MNT/foo + +# Now do a similar test when trying to dedup just the last (eof) block of a file +# into the middle of another file. This triggered a different bug on btrfs. +$XFS_IO_PROG -f -c "pwrite -S 0xae 0 100" $SCRATCH_MNT/baz | _filter_xfs_io + +# Unmount the filesystem and mount it again before attempting to dedupe baz's +# last block into foo. This is necessary to trigger that btrfs bug mentioned +# before. +_scratch_cycle_mount + +# Now attempt to dedupe the single block of baz into foo. +$XFS_IO_PROG -c "dedupe $SCRATCH_MNT/baz 0 2519040 100" $SCRATCH_MNT/foo \ + | _filter_xfs_io + +# Now attempt to unmount the filesystem before reading from the file. This is +# meant to trigger the btrfs bug which caused an infinite loop during inode +# eviction. +_scratch_cycle_mount + +# We should have exactly the same data we had before we asked for deduplication. +echo "File content after second deduplication:" +od -A d -t x1 $SCRATCH_MNT/foo + +status=0 +exit diff --git a/tests/generic/517.out b/tests/generic/517.out new file mode 100644 index 00000000..137a9719 --- /dev/null +++ b/tests/generic/517.out @@ -0,0 +1,45 @@ +QA output created by 517 +wrote 2518890/2518890 bytes at offset 0 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 102398/102398 bytes at offset 2518890 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 557771/557771 bytes at offset 0 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +File content before first deduplication: +0000000 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b +* +11467540 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b ae ae ae ae ae ae +11467560 ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae +* +11777540 ae ae ae ae ae ae ae ae +11777550 +deduped 557771/557771 bytes at offset 1957888 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +File content after first deduplication and before unmounting: +0000000 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b +* +2518880 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b ae ae ae ae ae ae +2518896 ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae +* +2621280 ae ae ae ae ae ae ae ae +2621288 +File content after first unmount: +0000000 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b +* +2518880 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b ae ae ae ae ae ae +2518896 ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae +* +2621280 ae ae ae ae ae ae ae ae +2621288 +wrote 100/100 bytes at offset 0 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +deduped 100/100 bytes at offset 2519040 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +File content after second deduplication: +0000000 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b +* +2518880 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b ae ae ae ae ae ae +2518896 ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae +* +2621280 ae ae ae ae ae ae ae ae +2621288 diff --git a/tests/generic/group b/tests/generic/group index 54d71d55..326d3a1d 100644 --- a/tests/generic/group +++ b/tests/generic/group @@ -519,3 +519,4 @@ 514 auto quick clone 515 auto quick clone 516 auto quick dedupe clone +517 auto quick dedupe clone -- 2.30.2