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Commit Graph

227 Commits

Author SHA1 Message Date
Zdenek Kabelac
a9d7a9d128 dmeventd: implement exit_on file check
When exit on file is present in a system and term/break signal is
catched, them dmeventd is no longger refusing to exit.

For the correct shutdown, there should be ideally unmonitoring call,
however in some case it's very hard to implement this correct procedure.

With this 'exit on' file dmeventd at least avoid 'blocking' shutdown,
before systemd kills use with -9 anyway possibly even in some unwanted
stated of internal dmeventd processing (i.e. in the middle of some lvm
command processing).
2023-09-26 01:23:00 +02:00
Zdenek Kabelac
80d34abf49 dmeventd: info status report
To quickly get info about some internal dmeventd status,
implment   'dmeventd -i' support.

Reported messages are some 'raw' internal informations mainly
useful to developers.
2023-09-26 01:23:00 +02:00
Zdenek Kabelac
637d812df5 dmeventd: unregister all devices on restart
Instead of just exiting in the middle of monitoring,
unregisted all monitored devices first and then exit.

To speedup this path, all send internal SIGINT when thread
unregiters itself, to wakup-up main sleeping loop.
2023-09-26 01:23:00 +02:00
Zdenek Kabelac
c31dcf3632 dmeventd: use return
Use 'return' instead of calling exit() when possible.
2023-09-26 01:23:00 +02:00
Zdenek Kabelac
29630b2d7f dmeventd: move var set to locked section
It should not change the actual code flow, however make the
set of the current_event variable inside locked section.
2023-09-03 22:03:33 +02:00
Zdenek Kabelac
d418fc14f4 cov: hide some false positives
Hide some false positives.

Note: there must not a be blank line after coverity hiding comment.
2023-05-10 16:19:46 +02:00
Zdenek Kabelac
4ef8f7cde6 gcc-fanalyzer: remove unneded zeroing
Since we zallocate array here, we don't need to set to NULL
and clean gcc warning about strdup leakage.
2021-09-21 21:03:47 +02:00
Zdenek Kabelac
462ac47003 clang: check for buffer existance
Make obvious to analyzer we can't get NULL here.
2021-09-21 21:03:47 +02:00
Zdenek Kabelac
1b52451996 cov: mask some warning about leakage
Mask false-positive leak report.
2021-09-20 14:26:09 +02:00
Zdenek Kabelac
93d565eda9 gcc-fanalyzer: use zeroed memory
Analyzer here was rather confused about possiblity of loosing previously
assigned device pointers - fixed by passing zero initialize memory
before first assign.
2021-09-20 13:58:57 +02:00
Zdenek Kabelac
2b3dcd754f cov: check return value
Log problems on fail path.
2021-04-23 23:00:55 +02:00
Zdenek Kabelac
dbb19f6ace cleanup: matching declaration order
Cosmetic
2020-09-01 17:57:50 +02:00
Zdenek Kabelac
212cf8efbd dmeventd: enhance time waiting loop
dmeventd is 'scanning' statuses in loop (most usually in 10sec
intervals) - and meanwhile it sleeps within:
pthread_cond_timedwait()

However this function call tends to wakeup sometimes a short amount of
time sooner - and our code still believe the 'right time' has not yet
arrived and basically for a moment 'busy-looped' on calling this
function - so for systems with 'clock_gettime()' present we obtain
time and we go 10ms to the future second - this avoids unneeded
repeated invocation of our time scheduling loop.

TODO: monitoring during 1 hour 'time-change'...
2020-03-05 17:38:55 +01:00
Zdenek Kabelac
4791d0f035 dmeventd: nicer error path for reading pipe
When _daemon_read()/_client_read() fails during the read,
ensure memory allocated withing function is also release here
(so caller does not need to care). Also improve code readbility a bit
a for same functionality use more similar code.
2020-02-04 17:22:06 +01:00
Zdenek Kabelac
555d6d4e62 cov: check error code from mutex init 2020-02-04 17:22:06 +01:00
Zdenek Kabelac
9ee3af7efc cov: more checks for failing syscalls 2019-11-14 18:06:42 +01:00
Zdenek Kabelac
18aa541ca2 configure: avoid repeative inclusion of configure.h
Since configure.h is a generated header and it's missing traditional
ifdefs preambule - it can be included & parsed multiple times.
Normally compiler is fine when defines have same value and there is
no warning - yet we don't need to parse this several times
and by adding -include  directive we can ensure every file
in the package is rightly compile with configure.h as the
first header file.
2018-12-21 19:19:50 +01:00
Zdenek Kabelac
035a7b9a4b dmeventd: fix linking with libdevmapper
Since dmeventd is 'libdm' based project, it needs to link
libdm library instead of its internal version

An external users may provide plugins loadeable by dmeventd.
So external user of libdevmapper-event library has no other option
then to link with released libdevmapper library.

The complexity comes with lvm2 plugins.
The lvm2 plugin itself uses internal version of device_mapper,
but libdevmapper-event usage is libdm based - so there needs to be avoided
any breakage on compatibility of internal i.e. dm_task_run structures.

TODO: most likely dmeventd itself should be moved into libdm/dm-tools dir,
and only lvm2 plugins should be created as part of lvm project,
but those still need to link with libdevmapper.
2018-12-14 22:33:22 +01:00
Zdenek Kabelac
c728d88e11 build: include configure.h
It's important to consistenly include  configure.h as the 1st. header.
It containts #defines influencing behavior of other included header
files.
2018-06-22 23:11:44 +02:00
Joe Thornber
0ac89fb860 various: some missing #include zalloc.h 2018-06-08 14:18:09 +01:00
Joe Thornber
d5da55ed85 device_mapper: remove dbg_malloc.
I wrote dbg_malloc before we had valgrind.  These days there's just
no need.
2018-06-08 13:40:53 +01:00
Joe Thornber
ccc35e2647 device-mapper: Fork libdm internally.
The device-mapper directory now holds a copy of libdm source.  At
the moment this code is identical to libdm.  Over time code will
migrate out to appropriate places (see doc/refactoring.txt).

The libdm directory still exists, and contains the source for the
libdevmapper shared library, which we will continue to ship (though
not neccessarily update).

All code using libdm should now use the version in device-mapper.
2018-05-16 13:00:50 +01:00
Joe Thornber
7f97c7ea9a build: Don't generate symlinks in include/ dir
As we start refactoring the code to break dependencies (see doc/refactoring.txt),
I want us to use full paths in the includes (eg, #include "base/data-struct/list.h").
This makes it more obvious when we're breaking abstraction boundaries, eg, including a file in
metadata/ from base/
2018-05-14 10:30:20 +01:00
Zdenek Kabelac
f41935909f dmeventd: add check for result code
Check result from pthread_kill.
2018-01-17 14:44:33 +01:00
Zdenek Kabelac
0c9e3e8df2 coverity: add some initilizers
Coverity cannot do a deeper analyzis so let's make just reports
go away and initialize them to 0.
2017-11-07 21:26:11 +01:00
Zdenek Kabelac
9940c2f754 dmeventd: schedule exit on break
When dmeventd receives SIGTERM/INT/HUP/QUIT it validates if exit is possible.
If there was any device still monitored, such exit request used to
be ignored/refused. This 'usually' worked reasonably well, however if there
is very short time period between last device is unmonitored and signal
reception - there was possibility such EXIT was ignored, as dmeventd has
not yet got into idle state even commands like 'vgchange -an' has already
finished.

This patch changes logic towards scheduling EXIT to the nearest
point when there is no monitored device.

EXIT is never forgotten.

NOTE: if there is only a single monitored device and someone sends
SIGTERM and later someone uses i.e. 'lvchange --refresh' after
unmonitoring dmeventd will exit and new instance needs to be
started.
2017-10-05 10:19:21 +02:00
Zdenek Kabelac
0bf836aa14 tidy: prefer not using else after return
clang-tidy: avoid using  'else' after return - give more readable code,
and also saves indention level.
2017-07-20 11:18:29 +02:00
Zdenek Kabelac
2a9eda1229 mem: add extra mem pages for pthread stack
Some archs can use even 64K pages and then lvm2 runs into trouble if
the stack is 'too small' to fit extra page capturing stack overwrite.

So when lvm2 limits stack - add extra mem page - be it 4K or 64K.

Relates to ppc64le bug: https://bugzilla.redhat.com/1387279
2017-02-11 18:23:15 +01:00
Zdenek Kabelac
4b4d19e3aa dmeventd: separate dm and dmeventd logging
Ensure different logging function for dmeventd.c logging
and dm and lvm library.

We can recognize we want to show every log_info() and
log_notice() message from dmeventd.c code while not
exposing those from libdm/libdevmapper-event

Also switch to use log with errno - it's not changing
anything and doesn't bring any more features yet to dmeventd
logging but we just properly pass dm_errno_or_class properly
through the whole code stack for possible future use
(i.e. support of class logging for dmeventd).
2016-11-03 12:43:09 +01:00
Zdenek Kabelac
00f883a4aa dmeventd: pthread_sigmask in single function
Integrate back _unblock_sigalrm() and check for error code of
pthread_sigmask() function so we do not use uninitialized
sigmask_t on error path (Coverity).
2016-10-03 17:47:28 +02:00
Zdenek Kabelac
fcbef05aae doc: change fsf address
Hmm rpmlint suggest fsf is using a different address these days,
so lets keep it up-to-date
2016-01-21 12:11:37 +01:00
Alasdair G Kergon
dcd946e95a dmeventd: Don't trust fifo with wrong attrs.
If an existing fifo has the wrong attributes it cannot be trusted
so we must unlink it and recreate it correctly.
(Replaces 2c8d6f5c90: if the other end of
the fifo already got opened while its mode was insecure, delaying the
chmod isn't going to make any difference!)
2015-12-08 01:48:17 +00:00
Zdenek Kabelac
11151121aa cleanup: use fputs for plain strings
Use fputs() when printing plain string,
easier then fprintf which needs to parse it.

Also check fd before close is >= 0 -
it is - but coverity fail to see it, so eliminate
this false-positive warning.
2015-11-09 10:22:52 +01:00
Zdenek Kabelac
2c8d6f5c90 dmeventd: open fifo in one function
Put calls related to fifo opening into a single function.

Fix  Time-Of-Check-Time-Of-Use and use fstat()
and fchmod() on already opened fd instead of
checking first path and then risking to open something
different.
2015-11-09 10:18:53 +01:00
Zdenek Kabelac
5d76bdcdbd dmeventd: event string parser handles empty field
Improve event string parser to avoid unneeded alloc+free.

Daemon talk function uses '-' to mark NULL/missing field.
So restore the NULL pointer back on parser.

This should have made old tools like 'dmevent_tool' work again.
As now 'uuid' or 'dso' could become NULL and then be
properly used in _want_registered_device() function.

Since lvm2 always fill these parameters, this change should
have no effect on lvm2.
2015-10-27 11:42:40 +01:00
Zdenek Kabelac
b702d67747 dmevent: fix referencing
Plugin increments DSO refcounter in _alloc_thread_status().
2015-10-26 23:31:23 +01:00
Zdenek Kabelac
b5b2a54834 cleanup: fix gcc compile with older pthread
Older pthread library was missing 'trick'
in pthread_cleanup_pop() which lead to
compilation error:

error: label at end of compound statement

Use explicit ';' to fix it.
2015-10-23 10:54:13 +02:00
Zdenek Kabelac
87a39d8bac dmeventd: ensure filter is empty
On some error path we could have left filter set to some value.
Not a big issue - but lets make reporting correct as soon
as we can.
2015-10-23 10:54:13 +02:00
Zdenek Kabelac
cff1c728d8 dmeventd: debug error paths 2015-10-23 10:54:13 +02:00
Zdenek Kabelac
1a2d0a0c72 cleanup: indents 2015-10-22 22:46:10 +02:00
Zdenek Kabelac
8be60e6a65 cleanup: easier to read code
Avoid using #ifdef code and use 'cmd' instead of 'die'.
2015-10-22 22:46:10 +02:00
Zdenek Kabelac
2af696c32f dmeventd: exit on idle
Implementing exit when 'dmeventd' is idle.
Default idle timeout set to 1 hour - after this time period
dmeventd will cleanly exit.

On systems with 'systemd' - service is automatically started with
next contact on dmeventd communication socket/fifo.

On other systems - new dmeventd starts again when lvm2 command detects
its missing and monitoring is needed.
2015-10-22 22:43:03 +02:00
Zdenek Kabelac
4284ba65eb dmeventd: debug signals 2015-10-22 22:41:12 +02:00
Zdenek Kabelac
12aa56d298 dmeventd: handle signal from plugin
Add support to unmonitor device when monitor recognizes there is
nothing to monitor anymore.

TODO: possibly API change with return value could be also used.
2015-10-22 22:40:07 +02:00
Zdenek Kabelac
9156c5d088 dmeventd: rework locking code
Redesign threading code:

- plugin registration runs within its new created thread for
  improved parallel usage.

- wait task is created just once and used during whole plugin lifetime.

- event thread is based over  'events' filter being set - when
  filter is 0, such thread is 'unused'.

- event loop is  simplified.

- timeout thread is never signaling 'processing' thread.

- pending of events filter cnange is properly reported and
  running event thread is signalled when possible.

- helgrind is not reporting problems.
2015-10-22 22:39:24 +02:00
Zdenek Kabelac
466a1c72b7 cleanup: use enums 2015-10-22 22:36:00 +02:00
Zdenek Kabelac
81e9ab3156 dmeventd: code mode _get_device_status
Move _get_device_status() in code.
Use dm_task_no_flush() function when reading status.
(e.g. none blocking for thins pool)
2015-10-22 22:35:25 +02:00
Zdenek Kabelac
15dbd4b56a dmeventd: minimize locking time for get_imeout
Don't hold lock when creating message (allocating memory).
Thread cannot dissapear as it's only the same thread which
may clean it.
2015-10-22 22:34:30 +02:00
Zdenek Kabelac
e2ea2a8147 dmeventd: drop unneded test
Function is never called without device.uuid.
2015-10-22 22:34:29 +02:00
Zdenek Kabelac
941c6354db dmeventd: wake up timer when setting new timeout 2015-10-22 22:34:29 +02:00