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If there's no record in the xattr.tdb, dbwrap_fetch() will return
NT_STATUS_NOT_FOUND. That should not result in an error in callers of
xattr_tdb_load_attrs().
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
This makes sure each module is at least loaded once
and registers itself as a module.
It means that the skel_opaque and skel_transparent vfs examples
are loaded.
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Ralph Boehme <slow@samba.org>
According to wikipedia, IRIX has seen the last patch update in August 2006. As
of now, www.sgi.com is unreachable. Probably this code has not been built in
years. If someone wants to revive it, it can be found in the git history.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Many callers use "-1" as the "len" argument. That's what ssize_t is for.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Calling set_thread_credentials() with the same values,
skips syscalls the 2nd time.
We only do this if '__thread' is supported to provide
thread local storage.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Tue Jul 24 20:35:17 CEST 2018 on sn-devel-144
The define reflects the results of a feature test, not a configure
option.
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This can be used implement a generic per thread impersonation
for thread pools.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This makes it possible to monitor the pthreadpool for exited worker
threads and may restart new threads from the main thread again.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Note this currently this doesn't enforce the support for
unshare(CLONE_FS) as some contraint container environment
(e.g. docker) reject the whole unshare() system call.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This can be used to check if worker threads run with
unshare(CLONE_FS).
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This paves the way for pthreadpool jobs that are path based.
Callers can use pthreadpool_per_thread_cwd() to check if
the current pool supports it.
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Ralph Boehme <slow@samba.org>
Note we still need some kind of runtime detection as
it can fail in some constraint container setups, which
reject the whole unshare() syscall instead of just the
once used for container features.
In case unshare(CLONE_FS) works, we can have a per thread
current working directory and use [f]chdir() safely in
worker threads.
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Ralph Boehme <slow@samba.org>
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Ralph Boehme <slow@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
This seems to be a really rare race, it's likely that the immediate
event will still trigger and cleanup.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
We should avoid traversing a linked list within a thread without holding
a mutex!
Using a mutex would be very tricky as we'll likely deadlock with
the mutexes at the raw pthreadpool layer.
So we use somekind of spinlock using atomic_thread_fence in order to
protect the access to job->state->glue->{tctx,ev} in
pthreadpool_tevent_job_signal().
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This avoids the expected helgrind/drd warnings on the job states which
are protected by the thread fence.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This will be used in lib/pthreadpool/pthreadpool_tevent.c
in order to avoid extected helgrind/drd warnings.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
In the direction from the main process to the job thread, we have:
- 'maycancel', which is set when tevent_req_cancel() is called,
- 'orphaned' is the job request, tevent_context or pthreadpool_tevent
was talloc_free'ed.
The job function can consume these by using:
/*
* return true - if tevent_req_cancel() was called.
*/
bool pthreadpool_tevent_current_job_canceled(void);
/*
* return true - if talloc_free() was called on the job request,
* tevent_context or pthreadpool_tevent.
*/
bool pthreadpool_tevent_current_job_orphaned(void);
/*
* return true if canceled and orphaned are both false.
*/
bool pthreadpool_tevent_current_job_continue(void);
In the other direction we remember the following points
in the job execution:
- 'started' - set when the job is picked up by a worker thread
- 'executed' - set once the job function returned.
- 'finished' - set when pthreadpool_tevent_job_signal() is entered
- 'dropped' - set when pthreadpool_tevent_job_signal() leaves with orphaned
- 'signaled' - set when pthreadpool_tevent_job_signal() leaves normal
There're only one side writing each element,
either the main process or the job thread.
This means we can do the coordination with a full memory
barrier using atomic_thread_fence(memory_order_seq_cst).
lib/replace provides fallbacks if C11 stdatomic.h is not available.
A real pthreadpool requires pthread and atomic_thread_fence() (or an
replacement) to be available, otherwise we only have pthreadpool_sync.c.
But this should not make a real difference, as at least
__sync_synchronize() is availabe since 2005 in gcc.
We also require __thread which is available since 2002.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
HAVE___THREAD and HAVE_DESTRUCTOR_ATTRIBUTE are already checked
as part of Samba.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This is watch tevent_req_create() uses and what callers of
tevent_context_wrapper_create() would therefore also expect.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
In case a remote DC does not support netr_DsRGetDCNameEx2(),
use netr_GetDcName() instead.
This should help with FreeIPA where embedded smbd runs as a domain
controller but does not implement full Active Directory compatibility.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13538
Signed-off-by: Alexander Bokovoy <ab@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Autobuild-User(master): Alexander Bokovoy <ab@samba.org>
Autobuild-Date(master): Tue Jul 24 09:55:23 CEST 2018 on sn-devel-144
Windows Server 1709 defaults to SMB2 and does not have SMB1 enabled.
When establishing trust, samba-tool does not specify SMB protocol
version and fail by default.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13308
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Alexander Bokovoy <ab@samba.org>
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13308
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Alexander Bokovoy <ab@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
This can be used to create a connection up to a negotiated
smbXcli_conn.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13308
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Alexander Bokovoy <ab@samba.org>
It will just do the session setup and tree connect steps.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13308
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Alexander Bokovoy <ab@samba.org>
