zfs/tests
Richard Yao 6a42939fcd
Cleanup: Address Clang's static analyzer's unused code complaints
These were categorized as the following:

 * Dead assignment		23
 * Dead increment		4
 * Dead initialization		6
 * Dead nested assignment	18

Most of these are harmless, but since actual issues can hide among them,
we correct them.

That said, there were a few return values that were being ignored that
appeared to merit some correction:

 * `destroy_callback()` in `cmd/zfs/zfs_main.c` ignored the error from
   `destroy_batched()`. We handle it by returning -1 if there is an
   error.

 * `zfs_do_upgrade()` in `cmd/zfs/zfs_main.c` ignored the error from
   `zfs_for_each()`. We handle it by doing a binary OR of the error
   value from the subsequent `zfs_for_each()` call to the existing
   value. This is how errors are mostly handled inside `zfs_for_each()`.
   The error value here is passed to exit from the zfs command, so doing
   a binary or on it is better than what we did previously.

 * `get_zap_prop()` in `module/zfs/zcp_get.c` ignored the error from
   `dsl_prop_get_ds()` when the property is not of type string. We
   return an error when it does. There is a small concern that the
   `zfs_get_temporary_prop()` call would handle things, but in the case
   that it does not, we would be pushing an uninitialized numval onto
   the lua stack. It is expected that `dsl_prop_get_ds()` will succeed
   anytime that `zfs_get_temporary_prop()` does, so that not giving it a
   chance to fix things is not a problem.

 * `draid_merge_impl()` in `tests/zfs-tests/cmd/draid.c` used
   `nvlist_add_nvlist()` twice in ways in which errors are expected to
   be impossible, so we switch to `fnvlist_add_nvlist()`.

A few notable ones did not merit use of the return value, so we
suppressed it with `(void)`:

 * `write_free_diffs()` in `lib/libzfs/libzfs_diff.c` ignored the error
   value from `describe_free()`. A look through the commit history
   revealed that this was intentional.

 * `arc_evict_hdr()` in `module/zfs/arc.c` did not need to use the
   returned handle from `arc_hdr_realloc()` because it is already
   referenced in lists.

 * `spa_vdev_detach()` in `module/zfs/spa.c` has a comment explicitly
   saying not to use the error from `vdev_label_init()` because whatever
   causes the error could be the reason why a detach is being done.

Unfortunately, I am not presently able to analyze the kernel modules
with Clang's static analyzer, so I could have missed some cases of this.
In cases where reports were present in code that is duplicated between
Linux and FreeBSD, I made a conscious effort to fix the FreeBSD version
too.

After this commit is merged, regressions like dee8934 should become
extremely obvious with Clang's static analyzer since a regression would
appear in the results as the only instance of unused code. That assumes
that Coverity does not catch the issue first.

My local branch with fixes from all of my outstanding non-draft pull
requests shows 118 reports from Clang's static anlayzer after this
patch. That is down by 51 from 169.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Cedric Berger <cedric@precidata.com>
Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Closes #13986
2022-10-14 13:37:54 -07:00
..
runfiles Enforce "-F" flag on resuming recv of full/newfs on existing dataset 2022-09-27 16:34:27 -07:00
test-runner Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
zfs-tests Cleanup: Address Clang's static analyzer's unused code complaints 2022-10-14 13:37:54 -07:00
Makefile.am Replace EXTRA_DIST with dist_noinst_DATA 2022-05-26 09:24:50 -07:00
README.md tests: README: note non-default mountd requirement 2022-04-01 17:57:45 -07:00

README.md

ZFS Test Suite README

1) Building and installing the ZFS Test Suite

The ZFS Test Suite runs under the test-runner framework. This framework is built along side the standard ZFS utilities and is included as part of zfs-test package. The zfs-test package can be built from source as follows:

$ ./configure
$ make pkg-utils

The resulting packages can be installed using the rpm or dpkg command as appropriate for your distributions. Alternately, if you have installed ZFS from a distributions repository (not from source) the zfs-test package may be provided for your distribution.

- Installed from source
$ rpm -ivh ./zfs-test*.rpm, or
$ dpkg -i ./zfs-test*.deb,

- Installed from package repository
$ yum install zfs-test
$ apt-get install zfs-test

2) Running the ZFS Test Suite

The pre-requisites for running the ZFS Test Suite are:

  • Three scratch disks
    • Specify the disks you wish to use in the $DISKS variable, as a space delimited list like this: DISKS='vdb vdc vdd'. By default the zfs-tests.sh script will construct three loopback devices to be used for testing: DISKS='loop0 loop1 loop2'.
  • A non-root user with a full set of basic privileges and the ability to sudo(8) to root without a password to run the test.
  • Specify any pools you wish to preserve as a space delimited list in the $KEEP variable. All pools detected at the start of testing are added automatically.
  • The ZFS Test Suite will add users and groups to test machine to verify functionality. Therefore it is strongly advised that a dedicated test machine, which can be a VM, be used for testing.
  • On FreeBSD, mountd(8) must use /etc/zfs/exports as one of its export files by default this can be done by setting zfs_enable=yes in /etc/rc.conf.

Once the pre-requisites are satisfied simply run the zfs-tests.sh script:

$ /usr/share/zfs/zfs-tests.sh

Alternately, the zfs-tests.sh script can be run from the source tree to allow developers to rapidly validate their work. In this mode the ZFS utilities and modules from the source tree will be used (rather than those installed on the system). In order to avoid certain types of failures you will need to ensure the ZFS udev rules are installed. This can be done manually or by ensuring some version of ZFS is installed on the system.

$ ./scripts/zfs-tests.sh

The following zfs-tests.sh options are supported:

-v          Verbose zfs-tests.sh output When specified additional
            information describing the test environment will be logged
            prior to invoking test-runner.  This includes the runfile
            being used, the DISKS targeted, pools to keep, etc.

-q          Quiet test-runner output.  When specified it is passed to
            test-runner(1) which causes output to be written to the
            console only for tests that do not pass and the results
            summary.

-x          Remove all testpools, dm, lo, and files (unsafe).  When
            specified the script will attempt to remove any leftover
            configuration from a previous test run.  This includes
            destroying any pools named testpool, unused DM devices,
            and loopback devices backed by file-vdevs.  This operation
            can be DANGEROUS because it is possible that the script
            will mistakenly remove a resource not related to the testing.

-k          Disable cleanup after test failure.  When specified the
            zfs-tests.sh script will not perform any additional cleanup
            when test-runner exists.  This is useful when the results of
            a specific test need to be preserved for further analysis.

-f          Use sparse files directly instead of loopback devices for
            the testing.  When running in this mode certain tests will
            be skipped which depend on real block devices.

-c          Only create and populate constrained path

-I NUM      Number of iterations

-d DIR      Create sparse files for vdevs in the DIR directory.  By
            default these files are created under /var/tmp/.
            This directory must be world-writable.

-s SIZE     Use vdevs of SIZE (default: 4G)

-r RUNFILES Run tests in RUNFILES (default: common.run,linux.run)

-t PATH     Run single test at PATH relative to test suite

-T TAGS     Comma separated list of tags (default: 'functional')

-u USER     Run single test as USER (default: root)

The ZFS Test Suite allows the user to specify a subset of the tests via a runfile or list of tags.

The format of the runfile is explained in test-runner(1), and the files that zfs-tests.sh uses are available for reference under /usr/share/zfs/runfiles. To specify a custom runfile, use the -r option:

$ /usr/share/zfs/zfs-tests.sh -r my_tests.run

Otherwise user can set needed tags to run only specific tests.

3) Test results

While the ZFS Test Suite is running, one informational line is printed at the end of each test, and a results summary is printed at the end of the run. The results summary includes the location of the complete logs, which is logged in the form /var/tmp/test_results/[ISO 8601 date]. A normal test run launched with the zfs-tests.sh wrapper script will look something like this:

$ /usr/share/zfs/zfs-tests.sh -v -d /tmp/test

--- Configuration ---
Runfile:         /usr/share/zfs/runfiles/linux.run
STF_TOOLS:       /usr/share/zfs/test-runner
STF_SUITE:       /usr/share/zfs/zfs-tests
STF_PATH:        /var/tmp/constrained_path.G0Sf
FILEDIR:         /tmp/test
FILES:           /tmp/test/file-vdev0 /tmp/test/file-vdev1 /tmp/test/file-vdev2
LOOPBACKS:       /dev/loop0 /dev/loop1 /dev/loop2
DISKS:           loop0 loop1 loop2
NUM_DISKS:       3
FILESIZE:        4G
ITERATIONS:      1
TAGS:            functional
Keep pool(s):    rpool


/usr/share/zfs/test-runner/bin/test-runner.py  -c /usr/share/zfs/runfiles/linux.run \
    -T functional -i /usr/share/zfs/zfs-tests -I 1
Test: /usr/share/zfs/zfs-tests/tests/functional/arc/setup (run as root) [00:00] [PASS]
...more than 1100 additional tests...
Test: /usr/share/zfs/zfs-tests/tests/functional/zvol/zvol_swap/cleanup (run as root) [00:00] [PASS]

Results Summary
SKIP	  52
PASS	 1129

Running Time:	02:35:33
Percent passed:	95.6%
Log directory:	/var/tmp/test_results/20180515T054509

4) Example of adding and running test-case (zpool_example)

This broadly boils down to 5 steps

  1. Create/Set password-less sudo for user running test case.
  2. Edit configure.ac, Makefile.am appropriately
  3. Create/Modify .run files
  4. Create actual test-scripts
  5. Run Test case

Will look at each of them in depth.

  • Set password-less sudo for 'Test' user as test script cannot be run as root

  • Edit file configure.ac and include line under AC_CONFIG_FILES section

      tests/zfs-tests/tests/functional/cli_root/zpool_example/Makefile
    
  • Edit file tests/runfiles/Makefile.am and add line zpool_example.

      pkgdatadir = $(datadir)/@PACKAGE@/runfiles
      dist_pkgdata_DATA = \
        zpool_example.run \
        common.run \
        freebsd.run \
        linux.run \
        longevity.run \
        perf-regression.run \
        sanity.run \
        sunos.run
    
  • Create file tests/runfiles/zpool_example.run. This defines the most common properties when run with test-runner.py or zfs-tests.sh.

      [DEFAULT]
      timeout = 600
      outputdir = /var/tmp/test_results
      tags = ['functional']
    
      tests = ['zpool_example_001_pos']
    

    If adding test-case to an already existing suite the runfile would already be present and it needs to be only updated. For example, adding zpool_example_002_pos to the above runfile only update the "tests =" section of the runfile as shown below

      [DEFAULT]
      timeout = 600
      outputdir = /var/tmp/test_results
      tags = ['functional']
    
      tests = ['zpool_example_001_pos', 'zpool_example_002_pos']
    
  • Edit tests/zfs-tests/tests/functional/cli_root/Makefile.am and add line under SUBDIRS.

      zpool_example \ (Make sure to escape the line end as there will be other folders names following)
    
  • Create new file tests/zfs-tests/tests/functional/cli_root/zpool_example/Makefile.am the contents of the file could be as below. What it says it that now we have a test case zpool_example_001_pos.ksh

      pkgdatadir = $(datadir)/@PACKAGE@/zfs-tests/tests/functional/cli_root/zpool_example
      dist_pkgdata_SCRIPTS = \
        zpool_example_001_pos.ksh
    
  • We can now create our test-case zpool_example_001_pos.ksh under tests/zfs-tests/tests/functional/cli_root/zpool_example/.

    # DESCRIPTION:
    #	zpool_example Test
    #
    # STRATEGY:
    #	1. Demo a very basic test case
    #
    
    DISKS_DEV1="/dev/loop0"
    DISKS_DEV2="/dev/loop1"
    TESTPOOL=EXAMPLE_POOL
    
    function cleanup
    {
    	# Cleanup
    	destroy_pool $TESTPOOL
    	log_must rm -f $DISKS_DEV1
    	log_must rm -f $DISKS_DEV2
    }
    
    log_assert "zpool_example"
    # Run function "cleanup" on exit
    log_onexit cleanup
    
    # Prep backend device
    log_must dd if=/dev/zero of=$DISKS_DEV1 bs=512 count=140000
    log_must dd if=/dev/zero of=$DISKS_DEV2 bs=512 count=140000
    
    # Create pool
    log_must zpool create $TESTPOOL $type $DISKS_DEV1 $DISKS_DEV2
    
    log_pass "zpool_example"
    
  • Run Test case, which can be done in two ways. Described in detail above in section 2.

    • test-runner.py (This takes run file as input. See zpool_example.run)
    • zfs-tests.sh. Can execute the run file or individual tests