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FAKE_LEVEL_II_OPLOCK was an indicator to break level2 oplock holders
on write. This information is now being held in brlock.tdb, which makes
the FAKE_LEVEL_II_OPLOCK type unnecessary.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This implements an idea by metze: Right now Samba does not grant level2
oplocks where it should: After an initial no-oplock open that has been
written to, we don't have the FAKE_LEVEL2_OPLOCK entry in locking.tdb
around anymore, this downgraded to NO_OPLOCK. Windows in this case will
grant level2 if being asked, we don't. Part of the reason for this
is that we don't have a proper mechanism to communicate the fact that
level2 needs to be broken to other smbds. Metze's insight was that we
have to look into brlock.tdb for every write anyway, so this might be
the right place to store this information.
My first reaction was that this is really hackish, but on further thought
this is not. oplocks depend on brlocks anyway, and we have the proper
mechanisms in place for brlocks.
The format for this change is to add one byte to the end of the brlock.tdb
record with value 1 if we have level2 oplocks around. Thus this patch
effectively reverts 8f41142 which I discovered while writing this
change. We now legally have unaligned records.
We can certainly talk about the format, but I'm not yet convinced we
need an idl for this yet. This is a potentially very hot code path,
and ndr marshalling has a cost.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
With the find_share_mode simplification we don't need fill_share_mode anymore.
So this coalesces add_share_mode as well.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
All callers used fill_share_mode_entry before calling
find_share_mode_entry. Remove that requirement.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
share_mode_stale_pid internally only has to deal with uint32_t. Make
the parameter match this.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
With the rewritten brl_get_lock_readonly we only set the destructor for
r/w lock records anyway.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Sun Oct 6 22:20:05 CEST 2013 on sn-devel-104
This is step 1 to get rid of brl_get_locks_internal with its complex readonly
business. It also optimizes 2 things: First, it uses dbwrap_parse_record to
avoid a talloc and memcpy, and second it uses talloc_pooled_object.
And -- hopefully it is easier to understand the caching logic with
fsp->brlock_rec and the clustering escape.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Without clustering, fsp->brlock_rec will never be set anyway. In the
clustering case we can't use the seqnum trick, so this is slow enough
that the additional if-statement does not matter in this case anyway. In
the non-clustered case it might. Have not measured it, but every little
bit helps I guess.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Sun Oct 6 15:49:43 CEST 2013 on sn-devel-104
If someone messes with brlock.tdb and inserts an invalid record length,
this will lead to memcpy overwriting a few bytes behind malloc'ed data.
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): Thu Sep 12 03:26:45 CEST 2013 on sn-devel-104
There's no point checking the validity of the "entry" argument more
than once
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>
The comment for this routine said:
> Modifies d->num_share_modes, watch out in routines iterating over
> that array.
Well, it turns out that *every* caller of this API got it wrong. So I
think it's better to change the routine.
This leaves the array untouched while iterating but filters out the
deleted ones while saving them back to disk.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>
For a given file, clean share mode entries for a given persistent file id.
Pair-Programmed-With: Michael Adam <obnox@samba.org>
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Gregor Beck <gbeck@sernet.de>
Signed-off-by: Michael Adam <obnox@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
For a given file, clean up brl entries belonging to a given persistent file id.
Signed-off-by: Gregor Beck <gbeck@sernet.de>
Reviewed-by: Michael Adam <obnox@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
We should not remove locks of disconnected opens just like that.
When getting the byte range lock record for a newly connected file
handle, we still do the clean up, because in that situation,
disconnected entries are not valid any more.
Signed-off-by: Gregor Beck <gbeck@sernet.de>
Reviewed-by: Michael Adam <obnox@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
...instead of checking each server-id separately which can
be expensive in a cluster.
Signed-off-by: Gregor Beck <gbeck@sernet.de>
Reviewed-by: Michael Adam <obnox@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
fsp->fnum and lock->fnum are uint64_t already and we should not truncate the value here.
Currently this doesn't matter as we only use 16-bit.
But as 'int' is int32_t and we later compare fnum with lock->fnum == fnum,
the cast from int32_t to uint64_t goes via int64_t instead of uint32_t.
This means even if fsp->fnum just uses 32-bit of the uint64_t
we'll get the wrong result, as the implicit cast from a negative int32_t
value to uint64_t adds 0xFFFFFFFF00000000.
metze
The fd count is implicit
Signed-off-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Thu Jun 14 01:53:17 CEST 2012 on sn-devel-104
Note: this changes the format of brlock.tdb!
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Autobuild-User: Michael Adam <obnox@samba.org>
Autobuild-Date: Wed Jun 6 23:22:00 CEST 2012 on sn-devel-104
Introduce find_delete_on_close_token. Thus is_delete_on_close_set
does not have to call get_delete_on_close_token anymore.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Autobuild-User: Stefan Metzmacher <metze@samba.org>
Autobuild-Date: Fri Jun 1 18:58:30 CEST 2012 on sn-devel-104
If a process died, the share mode entry might be bogus. Ignore those entries.
Signed-off-by: Jeremy Allison <jra@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
This is a helper routine that prunes a dead share mode entry on demand. This
prepares for removing the serverids_exist call in parse_share_modes.
Signed-off-by: Jeremy Allison <jra@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
This is a helper routine that prunes a dead share mode entry on demand. This
prepares for removing the serverids_exist call in parse_share_modes.
Signed-off-by: Jeremy Allison <jra@samba.org>
The delete tokens are unique to each name hash representing a pathname,
if we don't correctly return here we'll add duplicate tokens for a
given pasname hash.
Autobuild-User: Jeremy Allison <jra@samba.org>
Autobuild-Date: Sat Apr 7 02:13:58 CEST 2012 on sn-devel-104
Now that we always require a 64 bit off_t, we no longer need SMB_OFF_T.
Andrew Bartlett
Autobuild-User: Andrew Bartlett <abartlet@samba.org>
Autobuild-Date: Fri Apr 6 01:47:43 CEST 2012 on sn-devel-104
get_share_mode_lock_fresh is just a confusing name
Autobuild-User: Volker Lendecke <vl@samba.org>
Autobuild-Date: Sun Feb 19 19:16:41 CET 2012 on sn-devel-104
This will be used to enforce a lock hierarchy between the databases. We have
seen deadlocks between locking.tdb, brlock.tdb, serverid.tdb and notify*.tdb.
These should be fixed by refusing a dbwrap_fetch_locked that does not follow a
defined lock hierarchy.
This forces us to only do one real get_share_mode_lock call and
share the data between the nested get_share_mode_lock calls.
Signed-off-by: Jeremy Allison <jra@samba.org>
This slightly simplifies the code path for all callers which assume
that a share mode exists already. Only the callers in open_file_ntcreate
and open_directory will ever create new share modes.
Signed-off-by: Jeremy Allison <jra@samba.org>
This replaces fill_share_mode_lock() with the two routines
fresh_share_mode_lock() and parse_share_modes(). This lifts the
decision whether a share mode already existed on level up.
Signed-off-by: Jeremy Allison <jra@samba.org>
SMB_ASSERT is useless, since in non-developer build it does not actually
fail after the log message, but usual flow just continues.
Autobuild-User: Michael Adam <obnox@samba.org>
Autobuild-Date: Fri Nov 25 14:59:53 CET 2011 on sn-devel-104
This will make it easier to convert locking.tdb to IDL, and I don't think there
will be enough entries to justify a linked list over an array.
Autobuild-User: Volker Lendecke <vlendec@samba.org>
Autobuild-Date: Wed Nov 23 09:02:12 CET 2011 on sn-devel-104
This is the main reason for the preceding commits. We need to reduce the number
of round-trips to ctdb when checking the locking record entries for existence.
Using the plural version of process_exists gets the number of round-trips to
ctdb for process_exists down to 1.
Disallow "." in can_set_delete_on_close().
Autobuild-User: Jeremy Allison <jra@samba.org>
Autobuild-Date: Wed Oct 12 21:07:27 CEST 2011 on sn-devel-104
Also start new folder lib/dbwrap/ where dbwrap_open.c is stored and
make the fallbacke implementation functoins non-static and create a
dbwrap_private.h header file that contains their prototypes.
Reported by herb@samba.org. Remove the (premature) optimization
on file close.
Autobuild-User: Jeremy Allison <jra@samba.org>
Autobuild-Date: Sat Jul 16 02:32:02 CEST 2011 on sn-devel-104
My previous patches fixed up all direct TDB callers, but there are a
few utility functions and the db_context functions which are still
using the old -1 / 0 return codes.
It's clearer to fix up all the callers of these too, so everywhere is
consistent: non-zero means an error.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Pair-Programmed-With: Michael Adam <obnox@samba.org>
metze
Autobuild-User: Stefan Metzmacher <metze@samba.org>
Autobuild-Date: Fri Mar 18 13:00:51 CET 2011 on sn-devel-104
this value when searching for specific share mode entries.
Jeremy.
Autobuild-User: Jeremy Allison <jra@samba.org>
Autobuild-Date: Thu Mar 17 19:59:51 CET 2011 on sn-devel-104
Do this by keeping a linked list of delete on close tokens, one for
each filename that identifies a path to the dev/inode. Use the
jenkins hash of the pathname to identify the correct token.
This will reduce the noise from merges of the rest of the
libcli/security code, without this commit changing what code
is actually used.
This includes (along with other security headers) dom_sid.h and
security_token.h
Andrew Bartlett
Autobuild-User: Andrew Bartlett <abartlet@samba.org>
Autobuild-Date: Tue Oct 12 05:54:10 UTC 2010 on sn-devel-104
TDB_CLEAR_IF_FIRST tdb's. For tdb's like gencache where we open
without CLEAR_IF_FIRST and then with CLEAR_IF_FIRST if corrupt
this is still safe to use as if opening an existing tdb the new
hash will be ignored - it's only used on creating a new tdb not
opening an old one.
Jeremy.
