_______________________
SUPPORTED FS LIST
_______________________

History
-------

Firstly, xfstests is the old name of this project, due to it was originally
developed for testing the XFS file system on the SGI's Irix operating system.
When xfs was ported to Linux, so was xfstests, now it only supports Linux.

As xfstests has many test cases that can be run on some other filesystems,
we call them "generic" (and "shared", but it has been removed) cases, you
can find them in tests/generic/ directory. Then more and more filesystems
started to use xfstests, and contribute patches. Today xfstests is used
as a file system regression test suite for lots of Linux's major file systems.
So it's not "xfs"tests only, we tend to call it "fstests" now.

Supported fs
------------

Firstly, there's not hard restriction about which filesystem can use fstests.
Any filesystem can give fstests a try.

Although fstests supports many filesystems, they have different support level
by fstests. So mark it with 4 levels as below:

L1: Fstests can be run on the specified fs basically.
L2: Rare support from the specified fs list to fix some generic test failures.
L3: Normal support from the specified fs list, has some own cases.
L4: Active support from the fs list, has lots of own cases.

("+" means a slightly higher than the current level, but not reach to the next.
"-" is opposite, means a little bit lower than the current level.)

+------------+-------+---------------------------------------------------------+
| Filesystem | Level |                       Comment                           |
+------------+-------+---------------------------------------------------------+
| XFS        |  L4+  | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| Btrfs      |  L4   | https://btrfs.readthedocs.io/en/latest/dev/\            |
|            |       | Development-notes.html#fstests-setup                    |
+------------+-------+---------------------------------------------------------+
| Ext4       |  L4   | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| Ext2       |  L3   | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| Ext3       |  L3   | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| overlay    |  L3   | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| f2fs       |  L3-  | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| tmpfs      |  L3-  | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| NFS        |  L2+  | https://linux-nfs.org/wiki/index.php/Xfstests           |
+------------+-------+---------------------------------------------------------+
| Ceph       |  L2   | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| CIFS       |  L2-  | https://wiki.samba.org/index.php/Xfstesting-cifs        |
+------------+-------+---------------------------------------------------------+
| ocfs2      |  L2-  | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| Bcachefs   |  L2   | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| Exfat      |  L1+  | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| AFS        |  L1   | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| FUSE       |  L1   | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| GFS2       |  L1   | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| Glusterfs  |  L1   | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| JFS        |  L1   | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| pvfs2      |  L1   | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| Reiser4    |  L1   | Reiserfs has been removed, only left reiser4            |
+------------+-------+---------------------------------------------------------+
| ubifs      |  L1   | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| udf        |  L1   | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| Virtiofs   |  L1   | N/A                                                     |
+------------+-------+---------------------------------------------------------+
| 9p         |  L1   | N/A                                                     |
+------------+-------+---------------------------------------------------------+

_______________________
BUILDING THE FSQA SUITE
_______________________

Ubuntu or Debian
----------------

1. Make sure that package list is up-to-date and install all necessary packages:

   $ sudo apt-get update
   $ sudo apt-get install acl attr automake bc dbench dump e2fsprogs fio gawk \
        gcc git indent libacl1-dev libaio-dev libcap-dev libgdbm-dev libtool \
        libtool-bin liburing-dev libuuid1 lvm2 make psmisc python3 quota sed \
        uuid-dev uuid-runtime xfsprogs linux-headers-$(uname -r) sqlite3 \
        libgdbm-compat-dev

2. Install packages for the filesystem(s) being tested:

   $ sudo apt-get install exfatprogs f2fs-tools ocfs2-tools udftools xfsdump \
        xfslibs-dev

3. Install packages for optional features:

    systemd coredump capture:
    $ sudo apt install systemd-coredump systemd jq

Fedora
------

1. Install all necessary packages from standard repository:

   $ sudo yum install acl attr automake bc dbench dump e2fsprogs fio gawk gcc \
        gdbm-devel git indent kernel-devel libacl-devel libaio-devel \
        libcap-devel libtool liburing-devel libuuid-devel lvm2 make psmisc \
        python3 quota sed sqlite udftools  xfsprogs

2. Install packages for the filesystem(s) being tested:

    $ sudo yum install btrfs-progs exfatprogs f2fs-tools ocfs2-tools xfsdump \
        xfsprogs-devel

3. Install packages for optional features:

    systemd coredump capture:
    $ sudo yum install systemd systemd-udev jq

RHEL or CentOS
--------------

1. Enable EPEL repository:
    - see https://docs.fedoraproject.org/en-US/epel/#How_can_I_use_these_extra_packages.3F

2. Install all necessary packages which are available from standard repository
   and EPEL:

   $ sudo yum install acl attr automake bc dbench dump e2fsprogs fio gawk gcc \
        gdbm-devel git indent kernel-devel libacl-devel libaio-devel \
        libcap-devel libtool libuuid-devel lvm2 make psmisc python3 quota sed \
        sqlite udftools xfsprogs

   Or, EPEL packages could be compiled from sources, see:
    - https://dbench.samba.org/web/download.html
    - https://www.gnu.org/software/indent/

3. Build and install 'liburing':
    - see https://github.com/axboe/liburing.

4. Install packages for the filesystem(s) being tested:

    For XFS install:
     $ sudo yum install xfsdump xfsprogs-devel

    For exfat install:
     $ sudo yum install exfatprogs

    For f2fs build and install:
     - see https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs-tools.git/about/

    For ocfs2 build and install:
     - see https://github.com/markfasheh/ocfs2-tools

5. Install packages for optional features:

    systemd coredump capture:
    $ sudo yum install systemd systemd-udev jq

SUSE Linux Enterprise or openSUSE
---------------------------------

1. Install all necessary packages from standard repositories:

   $ sudo zypper install acct automake bc dbench duperemove dump fio gcc git \
        indent libacl-devel libaio-devel libattr-devel libcap libcap-devel \
        libtool liburing-devel libuuid-devel lvm2 make quota sqlite3 xfsprogs

2. Install packages for the filesystem(s) being tested:

    For btrfs install:
     $ sudo zypper install btrfsprogs libbtrfs-devel

    For XFS install:
     $ sudo zypper install xfsdump xfsprogs-devel

3. Install packages for optional features:

    systemd coredump capture:
    $ sudo yum install systemd systemd-coredump jq

Build and install test, libs and utils
--------------------------------------

$ git clone git://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git
$ cd xfstests-dev
$ make
$ sudo make install

Setup Environment
-----------------

1. Compile XFS/EXT4/BTRFS/etc. into your kernel or load as module. For example,
   for XFS, enable XFS_FS in your kernel configuration, or compile it as a
   module and load it with 'sudo modprobe xfs'. Most of the distributions will
   have these filesystems already in the kernel/as module.

2. Create TEST device:
    - format as the filesystem type you wish to test.
    - should be at least 10GB in size.
    - optionally populate with destroyable data.
    - device contents may be destroyed.

3. (optional) Create SCRATCH device.
    - many tests depend on the SCRATCH device existing.
    - not need to be formatted.
    - should be at least 10GB in size.
    - must be different to TEST device.
    - device contents will be destroyed.

4. (optional) Create SCRATCH device pool.
    - needed for BTRFS testing
    - specifies 3 or more independent SCRATCH devices via the SCRATCH_DEV_POOL
      variable e.g SCRATCH_DEV_POOL="/dev/sda /dev/sdb /dev/sdc"
    - device contents will be destroyed.
    - SCRATCH device should be left unset, it will be overridden
      by the SCRATCH_DEV_POOL implementation.

5. Copy local.config.example to local.config and edit as needed. The TEST_DEV
   and TEST_DIR are required.

6. (optional) Create fsgqa test users and groups:

   $ sudo useradd -m fsgqa
   $ sudo useradd 123456-fsgqa
   $ sudo useradd fsgqa2
   $ sudo groupadd fsgqa

   The "123456-fsgqa" user creation step can be safely skipped if your system
   doesn't support names starting with digits, only a handful of tests require
   it.

7. (optional) If you wish to run the udf components of the suite install
   mkudffs. Also download and build the Philips UDF Verification Software from
   https://www.lscdweb.com/registered/udf_verifier.html, then copy the udf_test
   binary to xfstests/src/.

8. (optional) To do io_uring related testing, please make sure below 3 things:
     1) kernel is built with CONFIG_IO_URING=y
     2) sysctl -w kernel.io_uring_disabled=0 (or set it to 2 to disable io_uring
        testing dynamically if kernel supports)
     3) install liburing development package contains liburing.h before building
        fstests

For example, to run the tests with loopback partitions:

    # xfs_io -f -c "falloc 0 10g" test.img
    # xfs_io -f -c "falloc 0 10g" scratch.img
    # mkfs.xfs test.img
    # losetup /dev/loop0 ./test.img
    # losetup /dev/loop1 ./scratch.img
    # mkdir -p /mnt/test && mount /dev/loop0 /mnt/test
    # mkdir -p /mnt/scratch

The config for the setup above is:

    $ cat local.config
    export TEST_DEV=/dev/loop0
    export TEST_DIR=/mnt/test
    export SCRATCH_DEV=/dev/loop1
    export SCRATCH_MNT=/mnt/scratch

From this point you can run some basic tests, see 'USING THE FSQA SUITE' below.

Additional Setup
----------------

Some tests require additional configuration in your local.config. Add these
variables to a local.config and keep that file in your workarea. Or add a case
to the switch in common/config assigning these variables based on the hostname
of your test machine. Or use 'setenv' to set them.

Extra TEST device specifications:
 - Set TEST_LOGDEV to "device for test-fs external log"
 - Set TEST_RTDEV to "device for test-fs realtime data"
 - If TEST_LOGDEV and/or TEST_RTDEV, these will always be used.
 - Set FSTYP to "the filesystem you want to test", the filesystem type is
   devised from the TEST_DEV device, but you may want to override it; if
   unset, the default is 'xfs'

Extra SCRATCH device specifications:
 - Set SCRATCH_LOGDEV to "device for scratch-fs external log"
 - Set SCRATCH_RTDEV to "device for scratch-fs realtime data"
 - If SCRATCH_LOGDEV and/or SCRATCH_RTDEV, the USE_EXTERNAL environment

Tape device specification for xfsdump testing:
 - Set TAPE_DEV to "tape device for testing xfsdump".
 - Set RMT_TAPE_DEV to "remote tape device for testing xfsdump"
   variable set to "yes" will enable their use.
 - Note that if testing xfsdump, make sure the tape devices have a tape which
   can be overwritten.

Extra XFS specification:
 - Set TEST_XFS_REPAIR_REBUILD=1 to have _check_xfs_filesystem run
   xfs_repair -n to check the filesystem; xfs_repair to rebuild metadata
   indexes; and xfs_repair -n (a third time) to check the results of the
   rebuilding.
 - The FORCE_XFS_CHECK_PROG option was removed in July 2024, along with all
   support for xfs_check.
 - Set TEST_XFS_SCRUB_REBUILD=1 to have _check_xfs_filesystem run xfs_scrub in
   "force_repair" mode to rebuild the filesystem; and xfs_repair -n to check
   the results of the rebuilding.
 - xfs_scrub, if present, will always check the test and scratch
   filesystems if they are still online at the end of the test. It is no
   longer necessary to set TEST_XFS_SCRUB.

Tools specification:
 - dump:
    - Set DUMP_CORRUPT_FS=1 to record metadata dumps of XFS, ext* or
      btrfs filesystems if a filesystem check fails.
    - Set DUMP_COMPRESSOR to a compression program to compress metadumps of
      filesystems. This program must accept '-f' and the name of a file to
      compress; and it must accept '-d -f -k' and the name of a file to
      decompress. In other words, it must emulate gzip.
 - dmesg:
    - Set KEEP_DMESG=yes to keep dmesg log after test
 - kmemleak:
    - Set USE_KMEMLEAK=yes to scan for memory leaks in the kernel after every
      test, if the kernel supports kmemleak.
 - fsstress:
    - Set FSSTRESS_AVOID and/or FSX_AVOID, which contain options added to
      the end of fsstresss and fsx invocations, respectively, in case you wish
      to exclude certain operational modes from these tests.
 - core dumps:
    - Set COREDUMP_COMPRESSOR to a compression program to compress crash dumps.
      This program must accept '-f' and the name of a file to compress.  In
      other words, it must emulate gzip.

Kernel/Modules related configuration:
 - Set TEST_FS_MODULE_RELOAD=1 to unload the module and reload it between
   test invocations. This assumes that the name of the module is the same
   as FSTYP.
 - Set MODPROBE_PATIENT_RM_TIMEOUT_SECONDS to specify the amount of time we
   should try a patient module remove. The default is 50 seconds. Set this
   to "forever" and we'll wait forever until the module is gone.
 - Set KCONFIG_PATH to specify your preferred location of kernel config
   file. The config is used by tests to check if kernel feature is enabled.
 - Set REPORT_GCOV to a directory path to make lcov and genhtml generate
   html reports from any gcov code coverage data collected by the kernel.
   If REPORT_GCOV is set to 1, the report will be written to $REPORT_DIR/gcov/.

Test control:
 - Set LOAD_FACTOR to a nonzero positive integer to increase the amount of
   load applied to the system during a test by the specified multiple.
 - Set TIME_FACTOR to a nonzero positive integer to increase the amount of
   time that a test runs by the specified multiple.
 - For tests that are a member of the "soak" group, setting SOAK_DURATION
   allows the test runner to specify exactly how long the test should continue
   running.  This setting overrides TIME_FACTOR.  Floating point numbers are
   allowed, and the unit suffixes m(inutes), h(ours), d(ays), and w(eeks) are
   supported.

Misc:
 - If you wish to disable UDF verification test set the environment variable
   DISABLE_UDF_TEST to 1.
 - Set LOGWRITES_DEV to a block device to use for power fail testing.
 - Set PERF_CONFIGNAME to a arbitrary string to be used for identifying
   the test setup for running perf tests. This should be different for
   each type of performance test you wish to run so that relevant results
   are compared. For example 'spinningrust' for configurations that use
   spinning disks and 'nvme' for tests using nvme drives.
 - Set MIN_FSSIZE to specify the minimal size (bytes) of a filesystem we
   can create. Setting this parameter will skip the tests creating a
   filesystem less than MIN_FSSIZE.
 - Set DIFF_LENGTH to "number of diff lines to print from a failed test",
   by default 10, set to 0 to print the full diff
 - set IDMAPPED_MOUNTS=true to run all tests on top of idmapped mounts. While
   this option is supported for all filesystems currently only -overlay is
   expected to run without issues. For other filesystems additional patches
   and fixes to the test suite might be needed.
 - Set REPORT_VARS_FILE to a file containing colon-separated name-value pairs
   that will be recorded in the test section report.  Names must be unique.
   Whitespace surrounding the colon will be removed.
 - set CANON_DEVS=yes to canonicalize device symlinks. This will let you
   for example use something like TEST_DEV/dev/disk/by-id/nvme-* so the
   device remains persistent between reboots. This is disabled by default.
 - setenv XFS_IO_AVOID, which may contain a list of space separated
   xfs_io commands which will be avoided in case you want to exclude
   tests that require the use of certain file system operations such
   as "fpunch", "fcollapse", "finsert", or "zero".

______________________
USING THE FSQA SUITE
______________________

Running tests:

    - cd xfstests
    - By default the tests suite will run all the tests in the auto group. These
      are the tests that are expected to function correctly as regression tests,
      and it excludes tests that exercise conditions known to cause machine
      failures (i.e. the "dangerous" tests).
    - ./check '*/001' '*/002' '*/003'
    - ./check '*/06?'
    - Groups of tests maybe ran by: ./check -g [group(s)]
      See the tests/*/group.list files after building xfstests to learn about
      each test's group memberships.
    - If you want to run all tests regardless of what group they are in
      (including dangerous tests), use the "all" group: ./check -g all
    - To randomize test order: ./check -r [test(s)]
    - You can explicitly specify NFS/AFS/CIFS/OVERLAY, otherwise
      the filesystem type will be autodetected from $TEST_DEV:
        - for running nfs tests: ./check -nfs [test(s)]
        - for running afs tests: ./check -afs [test(s)]
        - for running cifs/smb3 tests: ./check -cifs [test(s)]
        - for overlay tests: ./check -overlay [test(s)]
          The TEST and SCRATCH partitions should be pre-formatted
          with another base fs, where the overlay dirs will be created


    The check script tests the return value of each script, and
    compares the output against the expected output. If the output
    is not as expected, a diff will be output and an .out.bad file
    will be produced for the failing test.

    Unexpected console messages, crashes and hangs may be considered
    to be failures but are not necessarily detected by the QA system.

__________________________
ADDING TO THE FSQA SUITE
__________________________


Creating new tests scripts:

    Use the "new" script.

Test script environment:

    When developing a new test script keep the following things in
    mind.  All of the environment variables and shell procedures are
    available to the script once the "common/preamble" file has been
    sourced and the "_begin_fstest" function has been called.

     1. The tests are run from an arbitrary directory.  If you want to
	do operations on an XFS filesystem (good idea, eh?), then do
	one of the following:

	(a) Create directories and files at will in the directory
	    $TEST_DIR ... this is within an XFS filesystem and world
	    writeable.  You should cleanup when your test is done,
	    e.g. use a _cleanup shell procedure in the trap ... see
	    001 for an example.  If you need to know, the $TEST_DIR
	    directory is within the filesystem on the block device
	    $TEST_DEV.

	(b) mkfs a new XFS filesystem on $SCRATCH_DEV, and mount this
	    on $SCRATCH_MNT. Call the the _require_scratch function
            on startup if you require use of the scratch partition.
            _require_scratch does some checks on $SCRATCH_DEV &
            $SCRATCH_MNT and makes sure they're unmounted. You should
            cleanup when your test is done, and in particular unmount
            $SCRATCH_MNT.
	    Tests can make use of $SCRATCH_LOGDEV and $SCRATCH_RTDEV
	    for testing external log and realtime volumes - however,
	    these tests need to simply "pass" (e.g. cat $seq.out; exit
	    - or default to an internal log) in the common case where
	    these variables are not set.

     2. You can safely create temporary files that are not part of the
	filesystem tests (e.g. to catch output, prepare lists of things
	to do, etc.) in files named $tmp.<anything>.  The standard test
	script framework created by "new" will initialize $tmp and
	cleanup on exit.

     3. By default, tests are run as the same uid as the person
	executing the control script "check" that runs the test scripts.

     4. Some other useful shell procedures:

	_get_fqdn		- echo the host's fully qualified
				  domain name

	_get_pids_by_name	- one argument is a process name, and
				  return all of the matching pids on
				  standard output

	_within_tolerance	- fancy numerical "close enough is good
				  enough" filter for deterministic
				  output ... see comments in
				  common/filter for an explanation

	_filter_date		- turn ctime(3) format dates into the
				  string DATE for deterministic
				  output

	_cat_passwd,		- dump the content of the password
	_cat_group		  or group file (both the local file
				  and the content of the NIS database
				  if it is likely to be present)

     5. General recommendations, usage conventions, etc.:
	- When the content of the password or group file is
	  required, get it using the _cat_passwd and _cat_group
	  functions, to ensure NIS information is included if NIS
	  is active.
	- When calling getfacl in a test, pass the "-n" argument so
	  that numeric rather than symbolic identifiers are used in
	  the output.
	- When creating a new test, it is possible to enter a custom name
	  for the file. Filenames are in form NNN-custom-name, where NNN
	  is automatically added by the ./new script as an unique ID,
	  and "custom-name" is the optional string entered into a prompt
	  in the ./new script. It can contain only alphanumeric characters
	  and dash. Note the "NNN-" part is added automatically.

     6. Test group membership: Each test can be associated with any number
	of groups for convenient selection of subsets of tests.  Group names
	must  be human readable using only characters in the set [:alnum:_-].

	Test authors associate a test with groups by passing the names of those
	groups as arguments to the _begin_fstest function. While _begin_fstests
	is a shell function that must be called at the start of a test to
	initialise the test environment correctly, the the build infrastructure
	also scans the test files for _begin_fstests invocations. It does this
	to compile the group lists that are used to determine which tests to run
	when `check` is executed. In other words, test files files must call
	_begin_fstest with their intended groups or they will not be run.

	However, because the build infrastructure also uses _begin_fstests as
	a defined keyword, addition restrictions are placed on how it must be
	formatted:

	(a) It must be a single line with no multi-line continuations.

	(b) group names should be separated by spaces and not other whitespace

	(c) A '#' placed anywhere in the list, even in the middle of a group
	    name, will cause everything from the # to the end of the line to be
	    ignored.

	For example, the code:

	_begin_fstest auto quick subvol snapshot # metadata

	associates the current test with the "auto", "quick", "subvol", and
	"snapshot" groups. Because "metadata" is after the "#" comment
	delimiter, it is ignored by the build infrastructure and so it will not
	be associated with that group.

	It is not necessary to specify the "all" group in the list because that
	group is always computed at run time from the group lists.


Verified output:

    Each test script has a name, e.g. 007, and an associated
    verified output, e.g. 007.out.

    It is important that the verified output is deterministic, and
    part of the job of the test script is to filter the output to
    make this so.  Examples of the sort of things that need filtering:

    - dates
    - pids
    - hostnames
    - filesystem names
    - timezones
    - variable directory contents
    - imprecise numbers, especially sizes and times

Pass/failure:

    The script "check" may be used to run one or more tests.

    Test number $seq is deemed to "pass" when:
    (a) no "core" file is created,
    (b) the file $seq.notrun is not created,
    (c) the exit status is 0, and
    (d) the output matches the verified output.

    In the "not run" case (b), the $seq.notrun file should contain a
    short one-line summary of why the test was not run.  The standard
    output is not checked, so this can be used for a more verbose
    explanation and to provide feedback when the QA test is run
    interactively.


    To force a non-zero exit status use:
	status=1
	exit

    Note that:
	exit 1
    won't have the desired effect because of the way the exit trap
    works.

    The recent pass/fail history is maintained in the file "check.log".
    The elapsed time for the most recent pass for each test is kept
    in "check.time".

    The compare-failures script in tools/ may be used to compare failures
    across multiple runs, given files containing stdout from those runs.

__________________
SUBMITTING PATCHES
__________________

Send patches to the fstests mailing list at fstests@vger.kernel.org.
