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The comment "this is used in very hot code paths" is not true right now, but
will get true soon....
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Now we have one fixed field for the exclusive lock holder and an array
of shared locks. This way we now prioritize writers over readers: If a
pending write comes in while readers are active, it will put itself
into the exclusive slot. Then it waits for the readers to vanish. Only
when all readers are gone the exclusive lock request is granted. New
readers will just look at the exclusive slot and see it's taken. They
will then line up as watchers, retrying whenever things change.
This also means that it will be cheaper to support many shared locks:
Granting a shared lock just means to extend the array. We don't have
to walk the array for possible conflicts.
This also adds explicit UPGRADE and DOWNGRADE operations for better
error checking.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This will allow using the g_lock.c logic on other databases as well
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Soon the g_lock database format will change. There will be one
exclusive entry and an array of shared entries. In that format,
there's no need to attach a lock_type to each entry in the g_lock
database. Reflect this change in the g_lock_dump API
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
The history of this file is a mess with lots of bugs. Most of the bugs
I believe are based on the cache of database contents we maintain in
struct dbwrap_watch_rec. This patch removes that cache and does all
modifications directly in the backend database.
This means we have to mess with the database format in a few more
places, but I think the format is simple enough that this does not
really hurt.
I tried for a few days to split this up into small pieces that are
easier to understand, but every time I separated out individual chunks
I found difficult to track down bugs that are all resolved in the
final code presented here. It's more lines of code, but I hope it's more
robust.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
With the wakeup messages changed, we don't need to store what used to
be the old message in the struct dbwrap_watched_watch_state
anymore. We still need to store the key that is watched for removal of
our watch entry in the request destructor
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
The instance ID per process globally identifies a watch instance
across databases. It's not necessary to send the database ID and the
watched key across, the uin64_t instance ID is sufficient.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This can lead to very confusing bugs, and the code right now does not
deal with it well.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
After dbwrap_record_storev()/delete(), dbwrap_record_get_value()
information is stale. Assert on the attempt to re-fetch data after it
became stale. This can't protect against someone copying the result
from dbwrap_record_get_value() somewhere else, but it's better than
nothing.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Avoid a call to dbwrap_record_get_value(), dbwrap_do_locked() already
gave us the value.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
I want to reduce dbwrap_record_get_value(). It makes the caller believe it can
make a copy of the TDB_DATA returned and that the value remains constant. It's
not, as you can always do a dbwrap_record_store().
This patch removes one requirement for getting the value out of a
db_record via dbwrap_record_get_value(). You can still make a copy, but from an
API perspective to me it's more obvious that "value" as a parameter to the
callback has a limited lifetime.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Tue Nov 12 22:18:40 UTC 2019 on sn-devel-184
We currently have the following substitution functions:
talloc_sub_basic()
talloc_sub_advanced()
talloc_sub_basic() currently substitutes a subset of talloc_sub_advanced().
We'll need a function X that only substitutes what talloc_sub_advanced()
substitutes *without* what talloc_sub_basic() does.
To get there rename talloc_sub_advanced() to talloc_sub_full(). A subsequent
commit will then bring back talloc_sub_advanced() as described above.
Examples with fictional replacement letters A and B. Currently:
talloc_sub_basic: A
talloc_sub_advanced: AB
New:
talloc_sub_basic: A
talloc_sub_advanced: B
talloc_sub_full: AB
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13745
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
This puts too much logic into this lowlevel infrastructure module,
given the two minor external users.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
ad_unpack() needs the filesize, not the capped IO size we're using in the caller
to read up to "size" bystem from the ._ AppleDouble file.
This fixes a regression introduced by bdc257a1cbac7e8c73a084b618ba642476807483
for bug 13968.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14171
RN: vfs_fruit returns capped resource fork length
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Wed Oct 30 14:52:34 UTC 2019 on sn-devel-184
Simply set the buffer size to AD_XATTR_MAX_HDR_SIZE. When reading the
AppleDouble file, read up to AD_XATTR_MAX_HDR_SIZE from the file.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14171
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
This was only needed as dbwrap_open() had a bug where it asked for the ctdb
connection before initializing messaging. The previous commit fixed that so we
can now safely remove the calls to cmdline_messaging_context() from all tools
that don't use messaging.
Bug: https://bugzilla.samba.org/show_bug.cgi?id=13925
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Thu Oct 24 09:33:47 UTC 2019 on sn-devel-184
gcc version 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04.1) with -O2 puts up a warning here:
../../source3/lib/wins_srv.c: In function ‘wins_srv_tags’:
../../source3/lib/wins_srv.c:235:3: error: assuming signed overflow does not
occur when simplifying conditional to constant [-Werror=strict-overflow]
for (j=0;j<count;j++) {
^~~
cc1: all warnings being treated as errors
Signed-off-by: Christian Ambach <ambi@samba.org>
Reviewed-by: Uri Simchoni <uri@samba.org>
Autobuild-User(master): Uri Simchoni <uri@samba.org>
Autobuild-Date(master): Wed Oct 23 04:57:09 UTC 2019 on sn-devel-184
"wrec->num_watchers" changes in dbwrap_watch_rec_del_watcher(). In
32d6cc84c I forgot to update the copy of that variable.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Fri Oct 18 22:28:07 UTC 2019 on sn-devel-184
This avoids creating a socket like:
.../winbindd_privileged/p
instead of
.../winbindd_privileged/pipe
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Anoop C S <anoopcs@redhat.com>
Reviewed-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Uri Simchoni <uri@samba.org>
Autobuild-User(master): Uri Simchoni <uri@samba.org>
Autobuild-Date(master): Fri Oct 18 08:54:04 UTC 2019 on sn-devel-184
This fixes the following flaky test:
UNEXPECTED(failure): samba3.raw.oplock.batch26(nt4_dc)
REASON: Exception: Exception: (../../source4/torture/raw/oplock.c:3718): wrong value for break_info.count got 0x2 - should be 0x1
You can reproduce it with two small msleeps, which means it's a race
condition:
diff --git a/source3/smbd/open.c b/source3/smbd/open.c
index 20b5a3e294c..126c7fc021d 100644
--- a/source3/smbd/open.c
+++ b/source3/smbd/open.c
@@ -1917,6 +1917,14 @@ NTSTATUS send_break_message(struct messaging_context *msg_ctx,
DATA_BLOB blob;
NTSTATUS status;
+ {
+ static bool sent = false;
+ if (sent) {
+ smb_msleep(500);
+ }
+ sent = true;
+ }
+
if (DEBUGLVL(10)) {
struct server_id_buf buf;
DBG_DEBUG("Sending break message to %s\n",
diff --git a/source3/smbd/oplock.c b/source3/smbd/oplock.c
index b3da84b1269..d9c4dbb9487 100644
--- a/source3/smbd/oplock.c
+++ b/source3/smbd/oplock.c
@@ -858,6 +858,8 @@ static void process_oplock_break_message(struct messaging_context *msg_ctx,
uint16_t break_to;
bool break_needed = true;
+ smb_msleep(100);
+
msg = talloc(talloc_tos(), struct oplock_break_message);
if (msg == NULL) {
DBG_WARNING("talloc failed\n");
15a8af075a2 introduced a bug where we immediately wake up ourselves
after doing a watch_send, leading to two inter-smbd oplock break
messages for this case. In theory, this should not matter, as in the
oplock break handler in the destination smbd we check
(fsp->sent_oplock_break != NO_BREAK_SENT)
so that the break does not get sent twice. However, with the above two
sleeps the oplock holding client could send out its oplock downgrade
while the second inter-smbd break messages was on its way.
The real fix would be to note in the share mode array that the
inter-smbd message has already been sent, but as other users of
dbwrap_watched_watch_send might also be affected by this bug, this fix
should be sufficient to get rid of this flaky test.
Unfortunately, dbwrap_watch.c is now pretty complex and needs some
serious refactoring to become understandable again. But that's
something for another day, sorry.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Before 15a8af075a2 we did not have a separately allocated watchers
array and dbwrap_watched_save() could play (too) smart tricks with
dbwrap_record_storev(). Now that we always have watchers talloc'ed, we
can remove those smart tricks from dbwrap_watched_save() in the next
commit.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Add a new utility functions that checks whether a struct smb_filename points to
a real named stream, excluding the default stream "::$DATA".
foo -> false
foo::$DATA -> false
foo:bar -> true
foo:bar:$DATA -> true
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14137
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
