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No change in behaviour, will be used in subsequent commits.
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
STORAGE_OFFLOAD_TOKEN_TYPE_ZERO_DATA is defined as 0xffff0001 in MS-FSCC
2.3.79.
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
No change in behaviour, this just ensures stdout and stderror are
logged with log level 0.
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
This makes it possible to use samba_runcmd_send() in processes like smbd
that install a SIGCHLD handler that reaps all terminated children.
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
This function is a solution to the problem of fork() requiring special
preperations in the caller to handle SIGCHLD signals and to reap the
child by wait()ing for it.
Instead, tfork provides a pollable file descriptor. The caller gets the
file descriptor by calling tfork_event_fd() on the handle returned from
tfork_create() and the caller can then get the status of the child
with a call to tfork_status().
tfork avoids raising SIGCHLD signals in the caller by installing a
temporary SIGCHLD handler from inside tfork_create() and tfork_status().
The termination signal of other child processes not created with tfork()
is forwarded to the existing signal handler if any.
There's one thing this thing can't protect us against and that is if a
process installs a SIGCHLD handler from one thread while another thread
is running inside tfork_create() or tfork_status() and the signal
handler doesn't forward signals for exitted childs it didn't fork, ie
our childs.
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 need to create a temporary messaging context in order to do
the auth logging. This can only be done as root.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12850
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
Autobuild-User(master): Garming Sam <garming@samba.org>
Autobuild-Date(master): Mon Jul 3 08:15:29 CEST 2017 on sn-devel-144
This ensures that the group memberships just created are reflected in the test
comparison. Otherwise we are trusting that no caches are primed, which is
simply not safe in a test.
(The login will put a list of groups, as obtained by the login over NETLOGON or
via the PAC, into the samlogon cache).
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Sun Jul 2 21:59:18 CEST 2017 on sn-devel-144
The tests make changes to the DC, do not wait for replication, then expect
those to be reflected in the client. If they bind to another server this
will not hold true.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
This control removes an entire subtree, which was the intention of the previouse code
but much more effectively.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
This should help to avoid clashes between periodic and manual runs of
the KCC during autobuild.
Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
Signed-off-by: Bob Campbell <bobcampbell@catalyst.net.nz>
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
This allows one LDAP socket to proceed if another fails, and reduces the
impact of a crash becoming a DoS bug, as it only impacts one socket.
This may mean we have a lot of idle tasks, but this should not be a big
issue
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
The metadata partition (sam.ldb) lock is not
enough to block another process in prepare_commit(),
because prepare_commit() is a no-op, if nothing
was changed in the specific backend.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
This shows that locks are made on this file as well
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
These extended tests allow us to show that a search (read) blocks a
transaction commit (write), and that a transaction commit blocks a
search.
Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Pair-programmed-with: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Pair-programmed-with: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
* handle one more LDB_FLAG_INTERNAL_DISABLE_SINGLE_VALUE_CHECK
case in ldb_tdb
* fix ldb_tdb locking (performance) problems
* fix ldb_tdb search inconsistencies by adding
read_[un]lock() hooks to the module stack
(bug #12858)
* add cmocka based tests for the locking issues
* ldb_version.h provides LDB_VERSION_{MAJOR,MINOR,RELEASE} defines
* protect ldb_modules.h from being used by Samba < 4.7
Note: that this release (as well as 1.1.30 and 1.1.31)
may cause problems for older applications, e.g. Samba
See https://bugzilla.samba.org/show_bug.cgi?id=12859
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Samba versions before 4.7 are incompatible with the read_[un]lock()
behaviour introduced into ldb.
This makes sure older Samba versions fail to compile against
ldb >= 1.2.0.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12859
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This indicates what feature set Samba assumes from the used
libldb from the system.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12859
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
The new ldb whole-db lock behaviour now allows this test
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
(ldb releases have been made while this patch set was in train)
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
We must hold locks not just for the duration of each search, but for the whole search
as our module stack may make multiple search requests to build up the whole result.
This is explains a number of replication and read corruption issues in Samba
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
This allows Samba to provide a consistent view of the DB
despite the use of multiple databases via the partitions module
and over multiple callbacks via a module stack.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
This will be used to implement read locking in ldb_tdb
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Currently, a lock is not held against modifications once the final
record is returned via a callback, so modifications can be made
during the DONE callback. This makes it hard to write modules
that interpert an ldb search result and do further processing
so will change in the future to allow the full search to be
atomic.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
A modify or rename during a search must not cause a search to change
output, and attributes having an index should in particular not see
any change in behaviour in this respect
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
This is required to pass the test in future, because
otherwise the clean up will fail because we hold locks.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
If we do not do this, then we never take the all record lock, and instead do a lock
for every record as we go, which is very slow during a large search
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Signed-off-by: Garming Sam <garming@catalyst.net.nz>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
* allow tdb_traverse_read before tdb_transaction[_prepare]_commit()
* Improve documentation for tdb_transaction_start()
* Add new function tdb_transaction_active()
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This will allow callers to avoid their own reference counting of transactions.
Additionally, this will always line up with the acutal transaction state, even
in the error cases where tdb can cancel the transaction
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
It now references the TDB_ALLOW_NESTING and TDB_DISALLOW_NESTING flags
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
This restores the original intent of tdb_traverse_read() in
7dd31288a701d772e45b1960ac4ce4cc1be782ed
This is needed to avoid a deadlock with tdb_lockall() and the
transaction start, as ldb_tdb should take the allrecord lock during a
search (which calls tdb_traverse), and can otherwise deadlock against
a transaction starting in another process
We add a test to show that a transaction can now start while a read
traverse is in progress
This allows more operations to happen in parallel. The blocking point
is moved to the prepare commit.
This in turn permits a roughly doubling of unindexed search
performance, because currently ldb_tdb omits to take the lock due to
an unrelated bug, but taking the allrecord lock triggers the
above-mentioned deadlock.
This behaviour was added in 251aaafe3a9213118ac3a92def9ab2104c40d12a for
Solaris 10 in 2005. But the run-fcntl-deadlock test works also on Solaris 10,
see https://lists.samba.org/archive/samba-technical/2017-April/119876.html.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
We need to migrate all pathname based VFS calls to use a struct
to finish modernising the VFS with extra timestamp and flags parameters.
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Richard Sharpe <realrichardsharpe@gmail.com>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Sat Jul 1 07:20:28 CEST 2017 on sn-devel-144
