Filesystem regressions related to partial page zeroing can go unnoticed for a decent amount of time. A recent example is the issue of iomap zero range not handling dirty pagecache over unwritten extents, which leads to wrong behavior on certain file extending operations (i.e. truncate, write extension, etc.). fsx does occasionally uncover these sorts of problems, but failures can be rare and/or require longer running tests outside what is typically run via full fstests regression runs. fsx now supports a mode that injects post-eof data in order to explicitly test partial eof zeroing behavior. This uncovers certain problems more quickly and applies coverage more broadly across size changing operations. Add a new test that runs an fsx instance (modeled after generic/127) with eof pollution mode enabled. While the test is generic, it is currently limited to XFS as that is currently the only known major fs that does enough zeroing to satisfy the strict semantics expected by fsx. The long term goal is to uncover and fix issues so more filesystems can enable this test. Signed-off-by: Brian Foster <bfoster@xxxxxxxxxx> --- tests/generic/363 | 23 +++++++++++++++++++++++ tests/generic/363.out | 2 ++ 2 files changed, 25 insertions(+) create mode 100755 tests/generic/363 create mode 100644 tests/generic/363.out diff --git a/tests/generic/363 b/tests/generic/363 new file mode 100755 index 00000000..477c111c --- /dev/null +++ b/tests/generic/363 @@ -0,0 +1,23 @@ +#! /bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (c) 2024 Red Hat, Inc. All Rights Reserved. +# +# FSQA Test No. 363 +# +# Run fsx with EOF pollution enabled. This provides test coverage for partial +# EOF page/block zeroing for operations that change file size. +# + +. ./common/preamble +_begin_fstest rw auto + +_require_test + +# currently only xfs performs enough zeroing to satisfy fsx +_supported_fs xfs + +# on failure, replace -q with -d to see post-eof writes in the dump output +run_fsx "-q -S 0 -e 1 -N 100000" + +status=0 +exit diff --git a/tests/generic/363.out b/tests/generic/363.out new file mode 100644 index 00000000..3d219cd0 --- /dev/null +++ b/tests/generic/363.out @@ -0,0 +1,2 @@ +QA output created by 363 +fsx -q -S 0 -e 1 -N 100000 -- 2.45.0
