diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c index 820417d..1668cb7 100644 --- a/libraries/liblmdb/mdb.c +++ b/libraries/liblmdb/mdb.c @@ -1239,6 +1239,19 @@ static int mdb_page_alloc(MDB_cursor *mc, int num, MDB_page **mp); static int mdb_page_new(MDB_cursor *mc, uint32_t flags, int num, MDB_page **mp); static int mdb_page_touch(MDB_cursor *mc); +#define MDB_END_NAMES {"committed", "empty-commit", "abort", "reset", \ + "reset-tmp", "fail-begin", "fail-beginchild"} +enum { + /* mdb_txn_end operation number, for logging */ + MDB_END_COMMITTED, MDB_END_EMPTY_COMMIT, MDB_END_ABORT, MDB_END_RESET, + MDB_END_RESET_TMP, MDB_END_FAIL_BEGIN, MDB_END_FAIL_BEGINCHILD +}; +#define MDB_END_OPMASK 0x0F /**< mask for #mdb_txn_end() operation number */ +#define MDB_END_UPDATE 0x10 /**< update env state (DBIs) */ +#define MDB_END_FREE 0x20 /**< free txn unless it is #MDB_env.%me_txn0 */ +#define MDB_END_SLOT MDB_NOTLS /**< release any reader slot if #MDB_NOTLS */ +static void mdb_txn_end(MDB_txn *txn, unsigned mode); + static int mdb_page_get(MDB_txn *txn, pgno_t pgno, MDB_page **mp, int *lvl); static int mdb_page_search_root(MDB_cursor *mc, MDB_val *key, int modify); @@ -2484,12 +2497,6 @@ mdb_cursors_close(MDB_txn *txn, unsigned merge) } } -#if !(MDB_DEBUG) -#define mdb_txn_reset0(txn, act) mdb_txn_reset0(txn) -#endif -static void -mdb_txn_reset0(MDB_txn *txn, const char *act); - #if !(MDB_PIDLOCK) /* Currently the same as defined(_WIN32) */ enum Pidlock_op { Pidset, Pidcheck @@ -2669,11 +2676,7 @@ mdb_txn_renew0(MDB_txn *txn) txn->mt_dbflags[FREE_DBI] = DB_VALID; if (env->me_maxpg < txn->mt_next_pgno) { - mdb_txn_reset0(txn, "renew0-mapfail"); - if (new_notls) { - txn->mt_u.reader->mr_pid = 0; - txn->mt_u.reader = NULL; - } + mdb_txn_end(txn, new_notls /*0 or MDB_END_SLOT*/ | MDB_END_FAIL_BEGIN); return MDB_MAP_RESIZED; } @@ -2788,7 +2791,7 @@ mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret) if (!rc) rc = mdb_cursor_shadow(parent, txn); if (rc) - mdb_txn_reset0(txn, "beginchild-fail"); + mdb_txn_end(txn, MDB_END_FAIL_BEGINCHILD); } else { /* MDB_RDONLY */ txn->mt_dbiseqs = env->me_dbiseqs; renew: @@ -2851,35 +2854,44 @@ mdb_dbis_update(MDB_txn *txn, int keep) env->me_numdbs = n; } -/** Common code for #mdb_txn_reset() and #mdb_txn_abort(). +/** End a transaction, except successful commit of a nested transaction. * May be called twice for readonly txns: First reset it, then abort. - * @param[in] txn the transaction handle to reset - * @param[in] act why the transaction is being reset + * @param[in] txn the transaction handle to end + * @param[in] mode why and how to end the transaction */ static void -mdb_txn_reset0(MDB_txn *txn, const char *act) +mdb_txn_end(MDB_txn *txn, unsigned mode) { MDB_env *env = txn->mt_env; +#if MDB_DEBUG + static const char *const names[] = MDB_END_NAMES; +#endif - /* Close any DBI handles opened in this txn */ - mdb_dbis_update(txn, 0); + /* Export or close DBI handles opened in this txn */ + mdb_dbis_update(txn, mode & MDB_END_UPDATE); DPRINTF(("%s txn %"Z"u%c %p on mdbenv %p, root page %"Z"u", - act, txn->mt_txnid, (txn->mt_flags & MDB_TXN_RDONLY) ? 'r' : 'w', + names[mode & MDB_END_OPMASK], + txn->mt_txnid, (txn->mt_flags & MDB_TXN_RDONLY) ? 'r' : 'w', (void *) txn, (void *)env, txn->mt_dbs[MAIN_DBI].md_root)); if (F_ISSET(txn->mt_flags, MDB_TXN_RDONLY)) { if (txn->mt_u.reader) { txn->mt_u.reader->mr_txnid = (txnid_t)-1; - if (!(env->me_flags & MDB_NOTLS)) + if (!(env->me_flags & MDB_NOTLS)) { txn->mt_u.reader = NULL; /* txn does not own reader */ + } else if (mode & MDB_END_SLOT) { + txn->mt_u.reader->mr_pid = 0; + txn->mt_u.reader = NULL; + } /* else txn owns the slot until it does MDB_END_SLOT */ } txn->mt_numdbs = 0; /* close nothing if called again */ txn->mt_dbxs = NULL; /* mark txn as reset */ } else { pgno_t *pghead = env->me_pghead; - mdb_cursors_close(txn, 0); + if (!(mode & MDB_END_UPDATE)) /* !(already closed cursors) */ + mdb_cursors_close(txn, 0); if (!(env->me_flags & MDB_WRITEMAP)) { mdb_dlist_free(txn); } @@ -2892,6 +2904,8 @@ mdb_txn_reset0(MDB_txn *txn, const char *act) env->me_pglast = 0; env->me_txn = NULL; + mode = 0; /* txn == env->me_txn0, do not free() it */ + /* The writer mutex was locked in mdb_txn_begin. */ if (env->me_txns) UNLOCK_MUTEX(env->me_wmutex); @@ -2905,6 +2919,9 @@ mdb_txn_reset0(MDB_txn *txn, const char *act) mdb_midl_free(pghead); } + + if (mode & MDB_END_FREE) + free(txn); } void @@ -2917,7 +2934,7 @@ mdb_txn_reset(MDB_txn *txn) if (!(txn->mt_flags & MDB_TXN_RDONLY)) return; - mdb_txn_reset0(txn, "reset"); + mdb_txn_end(txn, MDB_END_RESET); } void @@ -2929,13 +2946,7 @@ mdb_txn_abort(MDB_txn *txn) if (txn->mt_child) mdb_txn_abort(txn->mt_child); - mdb_txn_reset0(txn, "abort"); - /* Free reader slot tied to this txn (if MDB_NOTLS && writable FS) */ - if ((txn->mt_flags & MDB_TXN_RDONLY) && txn->mt_u.reader) - txn->mt_u.reader->mr_pid = 0; - - if (txn != txn->mt_env->me_txn0) - free(txn); + mdb_txn_end(txn, MDB_END_ABORT|MDB_END_SLOT|MDB_END_FREE); } /** Save the freelist as of this transaction to the freeDB. @@ -3286,12 +3297,15 @@ int mdb_txn_commit(MDB_txn *txn) { int rc; - unsigned int i; + unsigned int i, end_mode; MDB_env *env; if (txn == NULL) return EINVAL; + /* mdb_txn_end() mode for a commit which writes nothing */ + end_mode = MDB_END_EMPTY_COMMIT|MDB_END_UPDATE|MDB_END_SLOT|MDB_END_FREE; + if (txn->mt_child) { rc = mdb_txn_commit(txn->mt_child); if (rc) @@ -3301,10 +3315,7 @@ mdb_txn_commit(MDB_txn *txn) env = txn->mt_env; if (F_ISSET(txn->mt_flags, MDB_TXN_RDONLY)) { - mdb_dbis_update(txn, 1); - txn->mt_numdbs = 2; /* so txn_abort() doesn't close any new handles */ - mdb_txn_abort(txn); - return MDB_SUCCESS; + goto done; } if (F_ISSET(txn->mt_flags, MDB_TXN_ERROR)) { @@ -3472,7 +3483,6 @@ mdb_txn_commit(MDB_txn *txn) mdb_midl_free(env->me_pghead); env->me_pghead = NULL; mdb_midl_shrink(&txn->mt_free_pgs); - env->me_free_pgs = txn->mt_free_pgs; #if (MDB_DEBUG) > 2 mdb_audit(txn); @@ -3482,21 +3492,10 @@ mdb_txn_commit(MDB_txn *txn) (rc = mdb_env_sync(env, 0)) || (rc = mdb_env_write_meta(txn))) goto fail; - - /* Free P_LOOSE pages left behind in dirty_list */ - if (!(env->me_flags & MDB_WRITEMAP)) - mdb_dlist_free(txn); + end_mode = MDB_END_COMMITTED|MDB_END_UPDATE; done: - env->me_pglast = 0; - env->me_txn = NULL; - mdb_dbis_update(txn, 1); - - if (env->me_txns) - UNLOCK_MUTEX(env->me_wmutex); - if (txn != env->me_txn0) - free(txn); - + mdb_txn_end(txn, end_mode); return MDB_SUCCESS; fail: @@ -8969,7 +8968,7 @@ mdb_env_copyfd0(MDB_env *env, HANDLE fd) if (env->me_txns) { /* We must start the actual read txn after blocking writers */ - mdb_txn_reset0(txn, "reset-stage1"); + mdb_txn_end(txn, MDB_END_RESET_TMP); /* Temporarily block writers until we snapshot the meta pages */ wmutex = env->me_wmutex;