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2013-06-03tdb: Add another overflow check to tdb_expand_adjustVolker Lendecke1-0/+6
Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Rusty Russell <rusty@rustcorp.com.au> Autobuild-User(master): Volker Lendecke <vl@samba.org> Autobuild-Date(master): Mon Jun 3 14:08:54 CEST 2013 on sn-devel-104
2013-06-03tdb: Make tdb_recovery_allocate overflow-safeVolker Lendecke1-1/+6
Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Rusty Russell <rusty@rustcorp.com.au>
2013-06-03tdb: Make tdb_recovery_size overflow-safeVolker Lendecke2-7/+28
Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Rusty Russell <rusty@rustcorp.com.au>
2013-06-03tdb: add proper OOM/ENOSPC handling to tdb_expand()Stefan Metzmacher1-8/+23
Failing to do so will result in corrupt tdbs: We will overwrite the hash chain pointers with 0x42424242. Pair-Programmed-With: Volker Lendecke <vl@samba.org> Signed-off-by: Stefan Metzmacher <metze@samba.org> Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Rusty Russell <rusty@rustcorp.com.au>
2013-06-03tdb: add overflow detection to tdb_expand_adjust()Stefan Metzmacher1-3/+31
We round up at maximun to a new size of 4GB, but still return at least the given size. The caller has to deal with ENOSPC itself. Pair-Programmed-With: Volker Lendecke <vl@samba.org> Signed-off-by: Stefan Metzmacher <metze@samba.org> Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Rusty Russell <rusty@rustcorp.com.au>
2013-06-03tdb: add overflow/ENOSPC handling to tdb_expand_file()Stefan Metzmacher1-1/+11
Pair-Programmed-With: Volker Lendecke <vl@samba.org> Signed-off-by: Stefan Metzmacher <metze@samba.org> Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Rusty Russell <rusty@rustcorp.com.au>
2013-06-03tdb: add a 'new_size' helper variable to tdb_expand_file()Stefan Metzmacher1-4/+7
Pair-Programmed-With: Volker Lendecke <vl@samba.org> Signed-off-by: Stefan Metzmacher <metze@samba.org> Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Rusty Russell <rusty@rustcorp.com.au>
2013-06-03tdb: Add overflow-checking tdb_add_off_tVolker Lendecke2-0/+12
Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Rusty Russell <rusty@rustcorp.com.au>
2013-05-28tdb: fix logging of offets and lengths.Rusty Russell7-47/+46
We can have offsets > 2G, so use unsigned values. Fixes other prints to be native types rather than casts, too. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Reviewed-by: Andrew Bartlett <abartlet@samba.org> Autobuild-User(master): Andrew Bartlett <abartlet@samba.org> Autobuild-Date(master): Tue May 28 11:22:14 CEST 2013 on sn-devel-104
2013-05-14tdb: include information about hash function being used in tdbtool info outputChristian Ambach1-0/+2
makes it possible to easily determine if the tdb under examination uses jenkins hash or not Signed-off-by: Christian Ambach <ambi@samba.org> Reviewed-by: Volker Lendecke <vl@samba.org>
2013-03-26tdb: Little format changeVolker Lendecke1-1/+1
Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org>
2013-03-05tdb: Slightly simplify tdb_expand_fileVolker Lendecke1-2/+4
The "else" keywords are not necessary here, we return in the preceding if clause 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): Tue Mar 5 14:00:47 CET 2013 on sn-devel-104
2013-02-19tdb: Slightly simplify transaction_writeVolker Lendecke1-8/+2
realloc(NULL, ...) is equivalent to malloc. We are already using this realloc property for tdb->lockrecs. It should not make any difference in speed, it just makes for a little simpler code. 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): Tue Feb 19 17:30:13 CET 2013 on sn-devel-104
2013-02-19tdb: Make tdb_release_transaction_locks use tdb_allrecord_unlockVolker Lendecke1-1/+1
The transaction code uses tdb_alrecord_lock/upgrade, so it should also use the tdb_allrecord_unlock function just for symmetry reasons Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org>
2013-02-19tdb: Factor out the retry loop from tdb_allrecord_upgradeVolker Lendecke1-20/+39
For the mutex code we will have to lock the hashchain and the record lock area independently. So we will have to call the loop twice. And, it's a small refactoring for the better anyway I think. Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org>
2013-02-19tdb: Simplify fcntl_lock() a bitVolker Lendecke1-4/+4
All arguments but the cmd are the same. To me this looks a bit better and saves some bytes in the object code. Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org>
2013-02-19tdb: Use tdb_null in freelistcheckVolker Lendecke1-3/+2
Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org>
2013-02-16tdb: Fix a typoVolker Lendecke1-1/+1
Signed-off-by: Volker Lendecke <vl@samba.org> Autobuild-User(master): Simo Sorce <idra@samba.org> Autobuild-Date(master): Sat Feb 16 17:13:32 CET 2013 on sn-devel-104
2013-02-05tdb: Remove "header" from tdb_contextVolker Lendecke13-59/+64
header.hash_size was the only thing we ever referenced outside of tdb_open_ex and its direct callees. So this shrinks the tdb_context by 164 bytes. 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): Tue Feb 5 13:18:28 CET 2013 on sn-devel-104
2013-02-05tdb: Pass argument "header" to check_header_hashVolker Lendecke1-4/+6
Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org>
2013-02-05tdb: Pass argument "header" to tdb_new_databaseVolker Lendecke1-6/+8
Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org>
2013-01-07tdb: Fix undefined prototype warningsVolker Lendecke1-0/+2
These functions are deliberately left without prototypes according to 3fdeaa399, but without prototypes we get warnings. Reviewed-by: Rusty Russell <rusty@samba.org> Autobuild-User(master): Volker Lendecke <vl@samba.org> Autobuild-Date(master): Mon Jan 7 11:20:19 CET 2013 on sn-devel-104
2012-12-21tdb: Add a comment explaining the "check"Volker Lendecke1-1/+4
I had to ask git blame to find why we have to do it here... Reviewed-by: Rusty Russell <rusty@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org> Autobuild-User(master): Stefan Metzmacher <metze@samba.org> Autobuild-Date(master): Fri Dec 21 13:54:39 CET 2012 on sn-devel-104
2012-12-21tdb: Make tdb_new_database() follow a more conventional styleVolker Lendecke1-3/+4
We usually "goto fail" on every error and then in normal flow set the return variable to success. This patch removes a comment which from my point of view is now obsolete. It violates the {} rule from README.Coding here in favor of the style used in this function. Reviewed-by: Rusty Russell <rusty@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org>
2012-12-21tdb: Fix a typoVolker Lendecke1-1/+1
Reviewed-by: Rusty Russell <rusty@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org>
2012-12-21tdb: Fix a typoVolker Lendecke1-1/+1
Reviewed-by: Rusty Russell <rusty@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org>
2012-12-21tdb: Use tdb_lock_covered_by_allrecord_lock in tdb_unlockVolker Lendecke1-7/+1
Reviewed-by: Rusty Russell <rusty@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org>
2012-12-21tdb: Factor out tdb_lock_covered_by_allrecord_lock from tdb_lock_listVolker Lendecke1-23/+31
Reviewed-by: Rusty Russell <rusty@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org>
2012-12-21tdb: Simplify logic in tdb_lock_list slightlyVolker Lendecke1-7/+22
Reviewed-by: Rusty Russell <rusty@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org>
2012-12-21tdb: Slightly simplify tdb_lock_listVolker Lendecke1-11/+11
Avoid an else {} branch when we can do an early return Reviewed-by: Rusty Russell <rusty@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org>
2012-12-21tdb: Fix blank line endingsVolker Lendecke11-89/+89
Reviewed-by: Rusty Russell <rusty@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org>
2012-12-21tdb: Fix a commentVolker Lendecke1-1/+1
Reviewed-by: Rusty Russell <rusty@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org>
2012-12-21tdb: Fix a typoVolker Lendecke1-1/+1
Reviewed-by: Rusty Russell <rusty@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org>
2012-12-21tdb: Fix a missing CONVERTVolker Lendecke1-1/+1
methods->tdb_write expects data in on-disk format. For reading that record, methods->tdb_read() has taken care of the on-disk to in-memory representation according to the DOCONV() flag passed down. tdb_rec_write() is a wrapper around methods->tdb_write just doing the CONVERT() on the way to disk. Reviewed-by: Rusty Russell <rusty@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org>
2012-10-06tdb: Make tdb robust against improper CLEAR_IF_FIRST restartVolker Lendecke1-4/+28
When winbind is restarted, there is a potential crash in tdb. Following situation: We are in a cluster with ctdb. A winbind child hangs in a request to the DC. Cluster monitoring decides the node has a problem. Cluster monitoring decides to kill ctdbd. winbind child still hangs in a RPC request. winbind parent figures that ctdb is dead and immediately commits suicide. winbind parent is restarted by cluster management, overwriting gencache.tdb with CLEAR_IF_FIRST. The CLEAR_IF_FIRST logic as implemented now will not see that a child still has the tdb open, only the parent holds the ACTIVE_LOCK due to performance reasons. During the CLEAR_IF_FIRST logic is done, there is a very small window where we ftruncate(tfd, 0) the file and re-write a proper header without a lock. When during this small window the winbind child comes back, wanting to store something into gencache.tdb, that winbind child will crash with a SIGBUS. Sounds unlikely? See: [2012/09/29 07:02:31.871607, 0] lib/util.c:1183(smb_panic) PANIC (pid 1814517): internal error [2012/09/29 07:02:31.877596, 0] lib/util.c:1287(log_stack_trace) BACKTRACE: 35 stack frames: #0 winbindd(log_stack_trace+0x1a) [0x7feb7d4ca18a] #1 winbindd(smb_panic+0x2b) [0x7feb7d4ca25b] #2 winbindd(+0x1a3cc4) [0x7feb7d4bacc4] #3 /lib64/libc.so.6(+0x32900) [0x7feb7a929900] #4 /lib64/libc.so.6(memcpy+0x35) [0x7feb7a97f355] #5 /usr/lib64/libtdb.so.1(+0x6e76) [0x7feb7b0b0e76] #6 /usr/lib64/libtdb.so.1(+0x3d37) [0x7feb7b0add37] #7 /usr/lib64/libtdb.so.1(+0x863d) [0x7feb7b0b263d] #8 /usr/lib64/libtdb.so.1(+0x8700) [0x7feb7b0b2700] #9 /usr/lib64/libtdb.so.1(+0x2505) [0x7feb7b0ac505] #10 /usr/lib64/libtdb.so.1(+0x25b7) [0x7feb7b0ac5b7] #11 /usr/lib64/libtdb.so.1(tdb_fetch+0x13) [0x7feb7b0ac633] #12 winbindd(gencache_set_data_blob+0x259) [0x7feb7d4d8449] #13 winbindd(gencache_set+0x53) [0x7feb7d4d85b3] #14 winbindd(gencache_del+0x5e) [0x7feb7d4d879e] #15 winbindd(saf_delete+0x93) [0x7feb7d54b693] #16 winbindd(+0xe507e) [0x7feb7d3fc07e] #17 winbindd(+0xe85e5) [0x7feb7d3ff5e5] #18 winbindd(+0xe65be) [0x7feb7d3fd5be] #19 winbindd(+0xe7562) [0x7feb7d3fe562] #20 winbindd(init_dc_connection+0x2e) [0x7feb7d3fe5be] #21 winbindd(+0xe75d9) [0x7feb7d3fe5d9] #22 winbindd(cm_connect_netlogon+0x58) [0x7feb7d3fe658] #23 winbindd(_wbint_PingDc+0x61) [0x7feb7d410991] #24 winbindd(+0x103175) [0x7feb7d41a175] #25 winbindd(winbindd_dual_ndrcmd+0xb7) [0x7feb7d4107d7] #26 winbindd(+0xf8609) [0x7feb7d40f609] #27 winbindd(+0xf9075) [0x7feb7d410075] #28 winbindd(tevent_common_loop_immediate+0xe8) [0x7feb7d4db198] #29 winbindd(run_events_poll+0x3c) [0x7feb7d4d93fc] #30 winbindd(+0x1c2b52) [0x7feb7d4d9b52] #31 winbindd(_tevent_loop_once+0x90) [0x7feb7d4d9f60] #32 winbindd(main+0x7b3) [0x7feb7d3e7aa3] #33 /lib64/libc.so.6(__libc_start_main+0xfd) [0x7feb7a915cdd] #34 winbindd(+0xce2a9) [0x7feb7d3e52a9] This is in a winbind child, logfiles surrounding indicate the parent was restarted. This patch takes all chain locks around the CLEAR_IF_FIRST introduced tdb_new_database.
2012-10-06tdb: Make robust against shrinking tdbsRusty Russell1-12/+20
When probing for a size change (eg. just before tdb_expand, tdb_check, tdb_rescue) we call tdb_oob(tdb, tdb->map_size, 1, 1). Unfortunately this does nothing if the tdb has actually shrunk, which as Volker demonstrated, can actually happen if a "longlived" parent crashes. So move the map/update size/remap before the limit check. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-10-04tdb: add tdb_rescue()Rusty Russell1-0/+349
This allows for an emergency best-effort dump. It's a little better than strings(1). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-10-02tdb: Fix a typoVolker Lendecke1-1/+1
Autobuild-User(master): Volker Lendecke <vl@samba.org> Autobuild-Date(master): Tue Oct 2 19:52:16 CEST 2012 on sn-devel-104
2012-06-22tdb: make TDB_NOSYNC merely disable sync.Rusty Russell1-9/+8
(As suggested by Stefan Metzmacher, based on the change to ntdb.) Since commit ec96ea690edbe3398d690b4a953d487ca1773f1c, we handle the case where a process dies during a transaction commit. Unfortunately, TDB_NOSYNC means this no longer works, as it disables the recovery area as well as the actual msync/fsync. We should do everything except the syncs. This also means we can do a complete test with $TDB_NO_FSYNC set; just to get more complete coverage, we disable it explicitly for one test (where we override the actual sync calls anyway). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-03-29lib/tdb: Add/expose lock functions to support CTDBAmitay Isaacs1-2/+16
This patch adds two lock functions used by CTDB to perform asynchronous locking. These functions do not actually perform any fcntl operations, but only increment internal counters. - tdb_transaction_write_lock_mark() - tdb_transaction_write_lock_unmark() It also exposes two internal functions - tdb_lock_nonblock() - tdb_unlock() These functions are NOT exposed in include/tdb.h to prevent any further uses of these functions. If you ever need to use these functions, consider using tdb2. Signed-off-by: Amitay Isaacs <amitay@gmail.com>
2012-03-23lib/tdb: fix transaction issue for HAVE_INCOHERENT_MMAP.Rusty Russell1-11/+10
We unmap the tdb on expand, the remap. But when we have INCOHERENT_MMAP (ie. OpenBSD) and we're inside a transaction, doing the expand can mean we need to read from the database to partially fill a transaction block. This fails, because if mmap is incoherent we never allow accessing the database via read/write. The solution is not to unmap and remap until we've actually written the padding at the end of the file. Reported-by: Amitay Isaacs <amitay@gmail.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Autobuild-User: Rusty Russell <rusty@rustcorp.com.au> Autobuild-Date: Fri Mar 23 02:53:15 CET 2012 on sn-devel-104
2012-03-23lib/tdb: fix missing return 0 code.Rusty Russell1-1/+1
fde694274e1e5a11d1473695e7ec7a97f95d39e4 made tdb_mmap return an int, but didn't put the return 0 on the "internal db" case. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-03-22lib/tdb: fix OpenBSD incoherent mmap.Rusty Russell3-20/+35
This comment appears in two places in the code (commit 4c6a8273c6dd3e2aeda5a63c4a62aa55bc133099 from 2001): /* * We must ensure the file is unmapped before doing this * to ensure consistency with systems like OpenBSD where * writes and mmaps are not consistent. */ But this doesn't help, because if one process is using mmap and another using pwrite, we get incoherent results. As demonstrated by OpenBSD's failure on the tdb unit tests. Rather than disable mmap on OpenBSD, we test for this issue and force mmap to be enabled. This means that we will fail on very large TDBs on 32-bit systems, but it's better than the horrendous performance penalty on every OpenBSD system. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-02-14tdb: make tdb_private.h idempotent.Rusty Russell1-0/+3
The most convenient way to write unit tests in C is to directly #include the C files (CCAN uses this, for example). That works quite well, but it means that tdb_private.h now needs to be protected against multiple inclusions. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-01-06Fix compile when TDB_TRACE is enabled.Ira Cooper1-1/+1
Autobuild-User: Jeremy Allison <jra@samba.org> Autobuild-Date: Fri Jan 6 04:16:41 CET 2012 on sn-devel-104
2011-12-25tdb: Use tdb_parse_record in tdb_update_hashVolker Lendecke1-12/+16
This avoids a tdb_fetch, thus a malloc/memcpy/free in the tdb_store path
2011-12-21tdb: don't free old recovery area when expanding if already at EOF.Rusty Russell1-17/+30
We allocate a new recovery area by expanding the file. But if the recovery area is already at the end of file (as shown in at least one client case), we can simply expand the record, rather than freeing it and creating a new one. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Autobuild-User: Rusty Russell <rusty@rustcorp.com.au> Autobuild-Date: Wed Dec 21 06:25:40 CET 2011 on sn-devel-104
2011-12-21tdb: use same expansion factor logic when expanding for new recovery area.Rusty Russell3-21/+34
If we're expanding because the current recovery area is too small, we expand only the amount we need. This can quickly lead to exponential growth when we have a slowly-expanding record (hence a slowly-expanding transaction size). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2011-12-19tdb: Avoid a malloc/memcpy in _tdb_storeVolker Lendecke1-17/+8
2011-12-19tdb: be more careful on 4G files.Rusty Russell6-23/+53
I came across a tdb which had wrapped to 4G + 4K, and the contents had been destroyed by processes which thought it only 4k long. Fix this by checking on open, and making tdb_oob() check for wrap itself. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Autobuild-User: Rusty Russell <rusty@rustcorp.com.au> Autobuild-Date: Mon Dec 19 07:52:01 CET 2011 on sn-devel-104
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