| #! /bin/bash |
| # SPDX-License-Identifier: GPL-2.0 |
| # Copyright (c) 2019 Facebook. All Rights Reserved. |
| # |
| # FS QA Test 590 |
| # |
| # Test commit 0c4da70c83d4 ("xfs: fix realtime file data space leak") and |
| # 69ffe5960df1 ("xfs: don't check for AG deadlock for realtime files in |
| # bunmapi"). On XFS without the fixes, truncate will hang forever. On other |
| # filesystems, this just tests writing into big fallocates. |
| # |
| . ./common/preamble |
| _begin_fstest auto prealloc preallocrw |
| |
| # Override the default cleanup function. |
| _cleanup() |
| { |
| cd / |
| rm -f $tmp.* |
| test -n "$loop" && _destroy_loop_device "$loop" |
| rm -f "$TEST_DIR/$seq" |
| } |
| |
| . ./common/filter |
| |
| _supported_fs generic |
| _require_scratch_nocheck |
| _require_xfs_io_command "falloc" |
| |
| maxextlen=$((0x1fffff)) |
| bs=4096 |
| rextsize=4 |
| filesz=$(((maxextlen + 1) * bs)) |
| |
| must_disable_feature() { |
| local feat="$1" |
| |
| # If mkfs doesn't know about the feature, we don't need to disable it |
| $MKFS_XFS_PROG --help 2>&1 | grep -q "${feat}=0" || return 1 |
| |
| # If turning the feature on works, we don't need to disable it |
| _scratch_mkfs_xfs_supported -m "${feat}=1" "${disabled_features[@]}" \ |
| > /dev/null 2>&1 && return 1 |
| |
| # Otherwise mkfs knows of the feature and formatting with it failed, |
| # so we do need to mask it. |
| return 0 |
| } |
| |
| extra_options="" |
| # If we're testing XFS, set up the realtime device to reproduce the bug. |
| if [[ $FSTYP = xfs ]]; then |
| # If we don't have a realtime device, set up a loop device on the test |
| # filesystem. |
| if [[ $USE_EXTERNAL != yes || -z $SCRATCH_RTDEV ]]; then |
| _require_test |
| loopsz="$((filesz + (1 << 26)))" |
| _require_fs_space "$TEST_DIR" $((loopsz / 1024)) |
| $XFS_IO_PROG -c "truncate $loopsz" -f "$TEST_DIR/$seq" |
| loop="$(_create_loop_device "$TEST_DIR/$seq")" |
| USE_EXTERNAL=yes |
| SCRATCH_RTDEV="$loop" |
| disabled_features=() |
| |
| # disable reflink if not supported by realtime devices |
| must_disable_feature reflink && |
| disabled_features=(-m reflink=0) |
| |
| # disable rmap if not supported by realtime devices |
| must_disable_feature rmapbt && |
| disabled_features+=(-m rmapbt=0) |
| fi |
| extra_options="$extra_options -r extsize=$((bs * rextsize))" |
| extra_options="$extra_options -d agsize=$(((maxextlen + 1) * bs / 2)),rtinherit=1" |
| |
| _scratch_mkfs $extra_options "${disabled_features[@]}" >>$seqres.full 2>&1 |
| _try_scratch_mount >>$seqres.full 2>&1 || \ |
| _notrun "mount failed, kernel doesn't support realtime?" |
| _scratch_unmount |
| else |
| _scratch_mkfs $extra_options >>$seqres.full 2>&1 |
| fi |
| _scratch_mount |
| _require_fs_space "$SCRATCH_MNT" $((filesz / 1024)) |
| |
| # Allocate maxextlen + 1 blocks. As long as the allocator does something sane, |
| # we should end up with two extents that look something like: |
| # |
| # u3.bmx[0-1] = [startoff,startblock,blockcount,extentflag] |
| # 0:[0,0,2097148,1] |
| # 1:[2097148,2097148,4,1] |
| # |
| # Extent 0 has blockcount = ALIGN_DOWN(maxextlen, rextsize). Extent 1 is |
| # adjacent and has blockcount = rextsize. Both are unwritten. |
| $XFS_IO_PROG -c "falloc 0 $filesz" -c fsync -f "$SCRATCH_MNT/file" |
| |
| # Write extent 0 + one block of extent 1. Our extents should end up like so: |
| # |
| # u3.bmx[0-1] = [startoff,startblock,blockcount,extentflag] |
| # 0:[0,0,2097149,0] |
| # 1:[2097149,2097149,3,1] |
| # |
| # Extent 0 is written and has blockcount = ALIGN_DOWN(maxextlen, rextsize) + 1, |
| # Extent 1 is adjacent, unwritten, and has blockcount = rextsize - 1 and |
| # startblock % rextsize = 1. |
| # |
| # The -b is just to speed things up (doing GBs of I/O in 4k chunks kind of |
| # sucks). |
| $XFS_IO_PROG -c "pwrite -b 1M -W 0 $(((maxextlen + 2 - rextsize) * bs))" \ |
| "$SCRATCH_MNT/file" >> "$seqres.full" |
| |
| # Truncate the extents. |
| $XFS_IO_PROG -c "truncate 0" -c fsync "$SCRATCH_MNT/file" |
| |
| # We need to do this before the loop device gets torn down. |
| _scratch_unmount |
| _check_scratch_fs |
| |
| echo "Silence is golden" |
| status=0 |
| exit |