File: [Development] / xfs-cmds / xfstests / dmapi / src / suite2 / README (download)
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Merge of master-melb:xfs-cmds:24329a by kenmcd.
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#
# Copyright (c) 2000-2001 Silicon Graphics, Inc. All Rights Reserved.
#
DMAPI Test Suite
Informational File
------------------
I) Getting Started
A) Extracting from DMAPI_test.cpio
1) Create a new directory for storing the tests. We will refer to
this as the "base" directory. The base directory can be
located anywhere; it does NOT need to be in a DMAPI filesystem.
2) Move the archive file DMAPI_test.cpio to the base directory
and execute the following command to extract from the archive:
cpio -icvd < DMAPI_test.cpio
3) There should now be several files and subdirectories in the base
directory, including the file "file_list". Read this file for a
complete listing of which files should be present in which
directories. Compare "file_list" with the output of "ls -Rpl"
to be sure that you have the necessary files.
4) The base directory contains the files and programs that are of
immediate use for testing. The "bindir" subdirectory contains
the test programs and datafiles. The "lib" and "src" subdirectories
contain C libraries and source code for the C programs.
B) Checking the Existence and Version of DMAPI
The program check_dmapi can verify that you have the correct
version of DMAPI installed. NOTE: it can only be run as root.
Execute this command (from the "base" directory):
bindir/check_dmapi
It should report that you have a current version of DMAPI. If it
does not, it will also suggest which components of your DMAPI are
not current, and where to find a patch to update them.
C) Configuration
1) Creating the Test Directories
a) The Test Filesystem
Mount a DMAPI filesystem, or use an existing one.
This filesystem's mount info MUST be listed in /etc/fstab.
Write down the path to this filesystem's mountpoint, and label
it as "m_main" for future use.
b) The Main Test Directory
Create a new directory in the "m_main" filesystem.
Write down the path to this directory. Note ONLY the part
that comes AFTER "m_main". Label this as "d_name".
EXAMPLE: You have a DMAPI filesystem /dmi_main
You name the test directory /dmi_main/test_dir
"m_main" is /dmi_main
"d_name" is /test_dir
c) The Cross-NFS Test Directories
For NFS tests, all you must do is create two empty directories
(one for nfs2, one for nfs3). They do NOT need to be in a
DMAPI filesystem.
Your main test directory will be mounted across NFS, into these
two directories. Normally, the tests will do this automatically.
However, if you need to do this mount manually, the command
would look like this example:
mount -t nfs2 localhost:/dmi_main /dmi_nfs2
Write down the paths to these nfs2 and nfs3 test directories.
Label them "m_nfs2" and "m_nfs3" respectively.
c) The Realtime Test Filesystem and Directory
If you wish to test realtime i/o, you'll need a filesystem
mounted with a realtime partition, and a directory in that
filesystem.
Label the path to the filesystem mountpoint as "m_rt".
Label the path to the test directory as "d_rt".
2) Configuring menu_test
The Korn-shell script named menu_test is an interface to the
other test programs. At the beginning of the script, there
is a "configuration section", in which is sets several variables
for use in the rest of the script.
Open menu_test in any text editor and change the following
variable assignments in the configuration section:
a) base_dir:
Set this to the pathname of your "base" directory
(where you un-archived "DMAPI_test.cpio").
b) p_user:
Tests that do not run as root will run as this "primary" user.
Set this to any username.
c) m_main:
The mountpoint of the main test filesystem.
Set this to the value of "m_main" that you wrote down above.
d) d_name:
m_main concatenated with d_name is the main test directory path.
Set this to the value for "d_name" that you wrote down above.
e) m_nfs2:
The mountpoint of the nfs2 test filesystem.
Set this to the value of "m_nfs2" that you wrote down above.
f) m_nfs2:
The mountpoint of the nfs3 test filesystem.
Set this to the value of "m_nfs3" that you wrote down above.
g) m_rt:
The mountpoint of the realtime test filesystem.
Set this to the value of "m_rt" that you wrote down above.
h) d_rt:
The path to the realtime test directory.
Set this to the value of "d_rt" that you wrote down above.
3) Configuring "DMAPI_aliases"
This is an optional alternative to the menu interface. It runs
as a Korn shell "dot" script and creates an alias to each test.
It was made for those who wish to run tests directly from the
command line.
DMAPI_aliases has exactly the same configuration section as
menu_test. If you wish to use DMAPI_aliases, make the same
changes to its configuration section.
II) Running the Tests
A) Using "menu_test" to run tests
1) You must be superuser, using the Korn shell, to run menu_test.
You also must have adjusted the variables in menu_test's
"configuration section", as was explained above.
2) menu_test is (surprise!) menu based. Choose options by entering
their numbers.
3) The names of the menu options explain which DMAPI functions
or DMAPI events are being tested. Some of the options, labeled
accordingly, run more than one test programs.
4) See section SECTION# for a list of the test scripts and programs,
and a brief explanation of each script or program's function.
B) Using "DMAPI_aliases" to run tests
1) NOTE: The aliases in DMAPI_aliases are meant to be used by
those who are familiar with the test programs and wish to run
them more directly. [Designer's note: I included the alias
file more out of nostalgia than necessity.]
2) You should be superuser, using the Korn shell, to run DMAPI_aliases.
You also must have adjusted the variables in DMAPI_aliases's
"configuration section", as was explained above.
3) DMAPI_aliases should be invoked as a Korn shell "dot" script:
. ./DMAPI_aliases
It sets an alias for each test program; each alias begins with
the characters "do_" and is followed by some appropriate name.
Read DMAPI_aliases, or execute "alias | grep do", to
4) "Verbose mode"
In the menu of function tests, one of the options is an on/off
toggle of "verbose mode". When verbose mode is on, the function
tests will print semi-explanatory output. Verbose mode affects
only the function tests (this does include check_dmapi).
5) "Pausing after each command"
In the menu of event tests, one of the options is a toggle of
"pausing after each command". When this is on, the event tests
will pause for a carriage return after running each command.
This affects only the event tests.
C) Running tests directly
1) For the VERY adventurous, all the tests in the "bindir" directory
can be run directly from the command line. Only some of the files
in "bindir" are test scripts/programs. Read section III for a list
of function tests and section IV for a list of run_test (.dat)
testfiles.
2) Running a test program without parameters will produce a list of
correct options. (The exception to this is check_dmapi, which
normally has no parameters. check_dmapi takes only one option,
[-v] for verbose output.)
3) It is suggested that you read a program's source before running
it directly. (The source of the C programs is included in the
"src" directory.) Specifically, in each source file, an initial
comment explains the program's options/parameters in detail.
III) DMAPI Function tests:
This section offers a terse description of the DMAPI function tests.
For those tests written in C, the source code is given in the "src"
directory. The ksh scripts can, of course, be read directly.
In all cases except check_dmapi, running the program without
parameters will produce a list of correct options.
A) check_dmapi
Written in: C
Test of: presence (and correct version) of DMAPI library and kernel.
Options: [-v] flag for verbose output.
B) test_dmattr
Written in: C
Test of: dm_get_dmattr, dm_set_dmattr, dm_remove_dmattr.
C) test_efault
Written in: C
Test of: various bad function calls that should generate EFAULT,
according to the DMAPI specification.
D) test_eventlist
Written in: C
Test of: dm_get_eventlist, dm_set_eventlist.
E) test_fileattr
Written in: C
Test of: dm_get_fileattr, dm_set_fileattr,
dm_get_dirattrs, dm_get_bulkattr.
F) test_hole
Written in: C
Test of: dm_probe_hole, dm_punch_hole.
G) test_invis
Written in: C
Test of: dm_read_invis, dm_write_invis.
H) test_region
Written in: C
Test of: dm_get_region, dm_set,region.
I) test_rights
Written in: C
Test of: various bad function calls that should generate EACCES,
and other conditions pertaining to DMAPI rights.
J) test_allocinfo_1
Written in: ksh
Test of: dm_get_allocinfo.
K) test_allocinfo_2
Written in: ksh
Test of: dm_get_allocinfo.
IV) DMAPI Event tests and the "run_test" ksh script
A) How to use the "run_test" script
1) A quick description of run_test's behavior:
run_test invokes a DMAPI daemon (as a ksh coprocess). It then
proceeds in a loop, in which it reads a command from a "testfile",
executes that command, reads a description of expected events from
the testfile, and compares the expected events with the actual
events, as returned by the DMAPI daemon.
2) You must be superuser, using the Korn shell, to execute run_test.
3) Executing run_test without parameters will produce a list of
correct options. For a much more in-depth explanation of the
options to run_test, read its own initial comment.
B) The existing .dat testfiles
1) fail.dat
Tests the events from: a user trying to access files owned
by someone else (in this case, root).
2) main.dat
Tests the events from: events getting DM_RESP_ABORT, dm_send_msg(),
invisible i/o, and direct i/o.
3) nfs.dat
Tests the events from: events getting DM_RESP_ABORT over nfs,
EAGAIN over nfs.
4) pending.dat
Tests the events from: running dm_pending() while trying to
do standard i/o.
5) pending_nfs.dat
Tests the events from: running dm_pending() while trying to
do standard i/o over NFS
6) realtime.dat
Tests the events from: Invisible, direct, and standard i/o
on realtime files in a realtime filesystem.
7) smallq.dat
Tests the events from: Slow i/o due to a small event queue.
8) standard.dat
Tests the events from: various kinds of standard i/o,
memory-mapped i/o and remounting the filesystem.
9) standard_nfs.dat
Tests the events from: various kinds of standard i/o, over NFS.
C) How to write new ".dat" testfiles
1) Overview
A testfile contains a complete description of a DMAPI event test.
Testfiles are divided into sections: the first two contain
test initialization, while the remaining sections each contain ONE
command, followed by a list of expected events.
The following is a description of testfile syntax. If you wish to
fully understand testfile syntax, PLEASE examine the existing
testfiles and the "run_test" script.
2) Event information variables
a) From the daemon, "run_test" gets information about DMAPI events.
This information is stored in event information variables.
b) NOTE: event information variables are not persistent.
After "run_test" has compared the expected and actual events
for a command, and before it executes the next command, it
unsets the values of all these variables.
c) Most of these variables are arrays, indexed by the number of
the event (starting with 0). For example, if the initial event
is a read event, then we have "event[0]" set to "read", and
"file_handle[0]" set to the handle of whatever file was read.
d) "event_count" is a special variable. It holds the number of
events that were generated by the most recent command.
e) These are all the event information variables:
contents event event_count fs_handle handle length
offset media_designator mode mountpoint_handle
mountpoint_path msg_str name new_name new_parent
parent_handle ret_code root_handle sequence token
tries_left unmount_mode
f) PLEASE examine the run_test script to see which variables
are set by which events. (The scheme corresponds, roughly,
to the "Event Types" section of the DMAPI specification.)
3) Testfile section 1: List of required files
a) A testfile's first section is a list of the files it requires.
If these files are not present in the "bindir" directory,
"run_test" will abort the test and inform the user of which
files are missing.
b) Each line of this section may contain ANY NUMBER of filenames.
c) Lines beginning with // will be treated as comments. The
entirety of such lines will be ignored.
d) The last line of this section should begin with three hyphens
--- Other characters on that line will be ignored.
4) Testfile section 2: Initialization commands
a) A testfile's second section consists of a list of commands.
"run_test" will execute these commands before starting the
DMAPI daemon. Any necessary initialization should be done
here.
b) Each line of this section should be ONE shell command.
c) Lines beginning with // will be treated as comments.
The entirety of such lines will be ignored.
d) The last line of this section should begin with three hyphens
"---" Other characters on that line will be ignored.
5) Testfile sections 3 and on: Individual tests
a) The remaining sections of a testfile consist of a single
shell command, followed by descriptions of events that should
be generated by the command.
b) Comments
1) Comments are valid ONLY before the command.
2) Lines beginning with // will be treated as comments.
The entirety of such lines will be ignored.
3) Lines beginning with @@ will be treated as "print" comments.
Such lines will not be parsed, but they will be printed to
standard output during the test. This is useful for
describing what each test does.
c) Valid grammar for the command itself
1) Standard command syntax:
This should be ONE shell command, on a line by itself.
2) Alternate command syntax:
A) run_as_root:
If the test is preceded by the metacommand "run_as_root"
(on a line by itself) then the command will be run as
root rather than as "p_user". The command should still
be one command on a line by itself.
B) run_without_test:
If the test is preceded by the metacommand
"run_without_test" (on a line by itself), then ALL
subsequent lines in the section will be executed as
commands, and NO testing will be performed. Note that
the commands will be executed as root. This is useful
for re-initialization sections during a test.
NOTE: A testfile cannot end with a "run_without_test"
section. The last section must contain a test.
d) Valid grammar for the "expected events" lines
1) [variable_name] [value]
This specifies that the variable [variable_name] should be
set to [value].
2) [variable_name_1] matches [variable_name_2]
This specifies that both variables should be set to
the same value. A list of valid variables
3) [variable_name] store_in [string]
This specifies that the contents of [variable_name]
should be stored in a variable named [string].
The variable [string] can then be referenced as a
variable in later tests.
EXAMPLE: if two commands deal with the file "foobar",
you might want to check that they both use the same handle.
In the first section, write
"handle[0] store_in old_handle_0"
In the second section, write
"old_handle_0 matches handle[0]"
4) failure
This specifies that the command is expected to fail
(return some non-zero exit status). If "failure"
is not specified, the command is expected to succeed.
e) The last line of these sections should begin with three
hyphens "---". Other characters on that line will be ignored.
6) Sending messages to the DMAPI daemon
a) Overview
Normally, run_test only reads from the DMAPI daemon, and never
sends messages back. However, sometimes we need the daemon to
execute some function or change its behavior in some way. This
is accomplished by calling "send_msg" as a command in the
testfile. The test daemon has been coded to respond to the
following user events generated by send_msg:
b) unfriendly_X
Replace X here with an integer, as in "send_msg unfriendly_6".
This causes the daemon to respond to all messages (other than
user events) with DM_RESP_ABORT instead of DM_RESP_CONTINUE,
and with errno X. If the message is just "unfriendly", the
default errno is EBADMSG.
c) friendly
This returns the test_daemon to normal operation after it
was set to be "unfriendly".
d) countdown_X_Y
Replace X and Y with integers, as in "send_msg countdown_6_8".
This causes the daemon to respond to the next X messages (other
than user events) with DM_RESP_ABORT instead of DM_RESP_CONTINUE,
and with errno Y. If the message is just "countdown", the
default count is 5 and the default errno is EAGAIN.
e) pending_X
Replace X here with an integer, as in "send_msg pending_4".
This causes the daemon to call dm_pending() rather than
responding to the next X messages. If the message is just
"pending", the default count is 1. After the count reaches
zero, the messages will be responded to.
f) reset_fs
This message MUST be sent after remounting the test filesystem.
It causes the daemon to re-register for all events.
g) over
This message is sent by run_test itself, and should not be
sent in a testfile. "send_msg over" is called after each
command is executed, as an indicator that the batch of events
from that command is complete. When run_test sees a user
event with the data "over", it knows to stop reading events
and move on to the next command.
7) Other "helper functions" for testfiles
a) ctf (create test files)
purpose: creates 20 copies of "bindir/ls_to_copy".
parameters: location of "bindir", location of target directory.
written in: ksh
b) crttf (create realtime test files)
purpose: creates 10 realtime files.
parameters: location of "bindir", location of target directory.
written in: ksh
c) stf (setup test files)
purpose: set dm attributes and managed regions on target files.
parameters: location of "bindir", pathnames of target files.
written in: ksh
d) fcntl
purpose: do fcntl() syscall
parameters: see "usage" by running without parameters.
written in: C (source not included)
e) open_test
purpose: do open() syscall
parameters: see "usage" by running without parameters.
written in: C
f) rd
purpose: do read() syscall
parameters: see "usage" by running without parameters.
written in: C (source not included)
g) new_wf
purpose: do write() syscall (new version of wf)
parameters: see "usage" by running without parameters.
written in: C (source not included)
h) wf
purpose: do write() syscall
parameters: see "usage" by running without parameters.
written in: C (source not included)
i) truncate
purpose: truncate a file
parameters: see "usage" by running without parameters.
written in: C (source not included)
j) read_invis
purpose: do dm_read_invis()
parameters: see "usage" by running without parameters.
written in: C
k) write_invis
purpose: do dm_write_invis().
parameters: see "usage" by running without parameters.
written in: C
l) set_region
purpose: do dm_set_region()
parameters: see "usage" by running without parameters.
written in: C
m) set_return_on_destroy
purpose: do dm_set_return_on_destroy()
parameters: see "usage" by running without parameters.
written in: C
n) ctest.c
purpose: test memory mapping used by cc during compilation
(really a helper file, not a helper function)
o) mmap_cp
purpose: test memory mapping by using it to copy a file
parameters: source pathname, destination pathname
written in: C (source not included)
p) dump_allocinfo
purpose: test dm_get_allocinfo by using it to dump
a list of file extents, much like to xfs_bmap.
parameters: see "usage" by running without parameters
written in: C
q) mm_fill
purpose: fill a filesystem, using memory-mapped i/o
parameters: pathname of target file
written in: C
r) make_holey
purpose: create a hole-filled file, using wf
parameters: path to "bindir", pathname of target file,
count of how many holes should be created
written in: ksh
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