btrfs: test send with prealloc extent beyond EOF and hole punching
PATCH 1/1 btrfs: test send with prealloc extent beyond EOF and hole punching
From: Filipe Manana <[email protected]>
Test that an incremental send operation produces correct results if a file that has a prealloc (unwritten) extent beyond its EOF gets a hole punched in a section of that prealloc extent.
This test is motivated by a bug found in btrfs which is fixed by a patch for the linux kernel titled:
"Btrfs: send, fix incorrect file layout after hole punching beyond eof"
Signed-off-by Filipe Manana <[email protected]>
--- tests/btrfs/169 | 83 +++++++++++++++++++++++++++++++++++++++++++++++++++++ tests/btrfs/169.out | 13 +++++++++ tests/btrfs/group | 1 + 3 files changed, 97 insertions(+) create mode 100755 tests/btrfs/169 create mode 100644 tests/btrfs/169.out
tests/btrfs/169 new file +83 -0
@@ -0,0 +1,83 @@ +#! /bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2018 SUSE Linux Products GmbH. All Rights Reserved. +# +# FS QA Test No. 169 +# +# Test that an incremental send operation produces correct results if a file +# that has a prealloc (unwritten) extent beyond its EOF gets a hole punched +# in a section of that prealloc extent. +# +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.* + rm -fr $send_files_dir +} + +# get standard environment, filters and checks +. ./common/rc +. ./common/filter + +# real QA test starts here +_supported_fs btrfs +_supported_os Linux +_require_test +_require_scratch +_require_xfs_io_command "fpunch" +_require_xfs_io_command "falloc" "-k" + +send_files_dir=$TEST_DIR/btrfs-test-$seq + +rm -f $seqres.full +rm -fr $send_files_dir +mkdir $send_files_dir + +_scratch_mkfs >>$seqres.full 2>&1 +_scratch_mount + +# Create our test file with a prealloc extent of 4Mb starting at offset 0, +# then write 1Mb of data into offset 0. +$XFS_IO_PROG -f -c "falloc -k 0 4M" \ + -c "pwrite -S 0xea 0 1M" \ + $SCRATCH_MNT/foobar | _filter_xfs_io + +$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap1 2>&1 \ + | _filter_scratch +$BTRFS_UTIL_PROG send -f $send_files_dir/1.snap $SCRATCH_MNT/snap1 2>&1 \ + | _filter_scratch + +# Now punch a hole starting at an offset that corresponds to the file's current +# size (1Mb) and ends at an offset smaller then the end offset of the prealloc +# extent we allocated earlier (3Mb < 4Mb). +$XFS_IO_PROG -c "fpunch 1M 2M" $SCRATCH_MNT/foobar + +$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap2 2>&1 \ + | _filter_scratch +$BTRFS_UTIL_PROG send -p $SCRATCH_MNT/snap1 -f $send_files_dir/2.snap \ + $SCRATCH_MNT/snap2 2>&1 | _filter_scratch + +echo "File digest in the original filesystem:" +md5sum $SCRATCH_MNT/snap2/foobar | _filter_scratch + +# Now recreate the filesystem by receiving both send streams and verify we get +# the same file content that the original filesystem had. +_scratch_unmount +_scratch_mkfs >>$seqres.full 2>&1 +_scratch_mount + +$BTRFS_UTIL_PROG receive -f $send_files_dir/1.snap $SCRATCH_MNT +$BTRFS_UTIL_PROG receive -f $send_files_dir/2.snap $SCRATCH_MNT + +echo "File digest in the new filesystem:" +md5sum $SCRATCH_MNT/snap2/foobar | _filter_scratch + +status=0 +exit
tests/btrfs/169.out new file +13 -0
@@ -0,0 +1,13 @@ +QA output created by 169 +wrote 1048576/1048576 bytes at offset 0 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +Create a readonly snapshot of 'SCRATCH_MNT' in 'SCRATCH_MNT/snap1' +At subvol SCRATCH_MNT/snap1 +Create a readonly snapshot of 'SCRATCH_MNT' in 'SCRATCH_MNT/snap2' +At subvol SCRATCH_MNT/snap2 +File digest in the original filesystem: +d31659e82e87798acd4669a1e0a19d4f SCRATCH_MNT/snap2/foobar +At subvol snap1 +At snapshot snap2 +File digest in the new filesystem: +d31659e82e87798acd4669a1e0a19d4f SCRATCH_MNT/snap2/foobar
tests/btrfs/group +1 -0
@@ -171,3 +171,4 @@ 166 auto quick qgroup 167 auto quick replace volume 168 auto quick send +169 auto quick send
Signature · 1 line
2.11.0