On 30/10/24 01:23, fdmanana@xxxxxxxxxx wrote:
From: Filipe Manana <fdmanana@xxxxxxxx> Test that defrag merges adjacent extents that are contiguous. This exercises a regression fixed by a patchset for the kernel that is comprissed of the following patches: btrfs: fix extent map merging not happening for adjacent extents btrfs: fix defrag not merging contiguous extents due to merged extent maps Signed-off-by: Filipe Manana <fdmanana@xxxxxxxx> --- tests/btrfs/325 | 80 +++++++++++++++++++++++++++++++++++++++++++++ tests/btrfs/325.out | 22 +++++++++++++ 2 files changed, 102 insertions(+) create mode 100755 tests/btrfs/325 create mode 100644 tests/btrfs/325.out diff --git a/tests/btrfs/325 b/tests/btrfs/325 new file mode 100755 index 00000000..0b1ab3c2 --- /dev/null +++ b/tests/btrfs/325 @@ -0,0 +1,80 @@ +#! /bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2024 SUSE Linux Products GmbH. All Rights Reserved. +# +# FS QA Test 325 +# +# Test that defrag merges adjacent extents that are contiguous. +# +. ./common/preamble +_begin_fstest auto quick preallocrw defrag + +. ./common/filter + +_require_scratch +_require_btrfs_command inspect-internal dump-tree +_require_xfs_io_command "falloc" + +_fixed_by_kernel_commit xxxxxxxxxxxx \ + "btrfs: fix extent map merging not happening for adjacent extents" +_fixed_by_kernel_commit xxxxxxxxxxxx \ + "btrfs: fix defrag not merging contiguous extents due to merged extent maps" + +count_file_extent_items() +{ + # We count file extent extent items through dump-tree instead of using + # fiemap because fiemap merges adjacent extent items when they are + # contiguous. + # We unmount because all metadata must be ondisk for dump-tree to see + # it and work correctly. + _scratch_unmount + $BTRFS_UTIL_PROG inspect-internal dump-tree -t 5 $SCRATCH_DEV | \ + grep EXTENT_DATA | wc -l + _scratch_mount +} + +_scratch_mkfs >>$seqres.full 2>&1 || _fail "mkfs failed" +_scratch_mount + +# Create a file with a size of 256K and 4 written extents of 64K each. +# We fallocate to guarantee exact extent size, even if compression mount +# option is give, and write to them because defrag skips prealloc extents. +$XFS_IO_PROG -f -c "falloc 0 64K" \ + -c "pwrite -S 0xab 0 64K" \ + -c "falloc 64K 64K" \ + -c "pwrite -S 0xcd 64K 64K" \ + -c "falloc 128K 64K" \ + -c "pwrite -S 0xef 128K 64K" \ + -c "falloc 192K 64K" \ + -c "pwrite -S 0x73 192K 64K" \ + $SCRATCH_MNT/foo | _filter_xfs_io + +echo -n "Initial number of file extent items: " +count_file_extent_items + +# Read the whole file in order to load extent maps and merge them. +cat $SCRATCH_MNT/foo > /dev/null + +# Now defragment with a threshold of 128K. After this we expect to get a file
+# with 1 file extent item - the treshold is 128K but since all the extents are
+# contiguous, they should be merged into a single one of 256K. +$BTRFS_UTIL_PROG filesystem defragment -t 128K $SCRATCH_MNT/foo
+echo -n "Number of file extent items after defrag with 128K treshold: "
Nit: s/treshold/threshold/g
+count_file_extent_items + +# Read the whole file in order to load extent maps and merge them. +cat $SCRATCH_MNT/foo > /dev/null + +# Now defragment with a threshold of 256K. After this we expect to get a file +# with only 1 file extent item. +$BTRFS_UTIL_PROG filesystem defragment -t 256K $SCRATCH_MNT/foo +echo -n "Number of file extent items after defrag with 256K treshold: " +count_file_extent_items + +# Check that the file has the expected data, that defrag didn't cause any data +# loss or corruption. +echo "File data after defrag:" +_hexdump $SCRATCH_MNT/foo +
Nice. Nit: This can be a generic test-case. Reviewed-by: Anand Jain <anand.jain@xxxxxxxxxx> Thx, Anand
+status=0 +exit diff --git a/tests/btrfs/325.out b/tests/btrfs/325.out new file mode 100644 index 00000000..96053925 --- /dev/null +++ b/tests/btrfs/325.out @@ -0,0 +1,22 @@ +QA output created by 325 +wrote 65536/65536 bytes at offset 0 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 65536/65536 bytes at offset 65536 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 65536/65536 bytes at offset 131072 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 65536/65536 bytes at offset 196608 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +Initial number of file extent items: 4 +Number of file extent items after defrag with 128K treshold: 1 +Number of file extent items after defrag with 256K treshold: 1 +File data after defrag: +000000 ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab >................< +* +010000 cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd >................< +* +020000 ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef >................< +* +030000 73 73 73 73 73 73 73 73 73 73 73 73 73 73 73 73 >ssssssssssssssss< +* +040000