From e3f6c152c5ab1a9810a1d3ed7de9a3252ff9e35a Mon Sep 17 00:00:00 2001 From: Hallvard Furuseth Date: Mon, 23 Sep 2013 20:21:11 +0200 Subject: [PATCH] Drop unneeded code. MDB_txn.mt_toggle: Use (mt_txnid & 1) instead. Drop error checks which will be repeated. mdb_cursor_set(): Turn assert into if/return to match the above. mdb_cursor_del(): 'flags' are now used as bitflags. --- libraries/liblmdb/mdb.c | 37 +++++++++++++------------------------ 1 file changed, 13 insertions(+), 24 deletions(-) diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c index 8d2a43c..c4db089 100644 --- a/libraries/liblmdb/mdb.c +++ b/libraries/liblmdb/mdb.c @@ -898,10 +898,6 @@ struct MDB_txn { * dirty_list into mt_parent after freeing hidden mt_parent pages. */ unsigned int mt_dirty_room; - /** Tracks which of the two meta pages was used at the start - * of this transaction. - */ - unsigned int mt_toggle; }; /** Enough space for 2^32 nodes with minimum of 2 keys per node. I.e., plenty. @@ -2118,6 +2114,7 @@ static int mdb_txn_renew0(MDB_txn *txn) { MDB_env *env = txn->mt_env; + MDB_meta *meta; unsigned int i; uint16_t x; int rc, new_notls = 0; @@ -2128,8 +2125,8 @@ mdb_txn_renew0(MDB_txn *txn) if (txn->mt_flags & MDB_TXN_RDONLY) { if (!env->me_txns) { - i = mdb_env_pick_meta(env); - txn->mt_txnid = env->me_metas[i]->mm_txnid; + meta = env->me_metas[ mdb_env_pick_meta(env) ]; + txn->mt_txnid = meta->mm_txnid; txn->mt_u.reader = NULL; } else { MDB_reader *r = (env->me_flags & MDB_NOTLS) ? txn->mt_u.reader : @@ -2174,13 +2171,13 @@ mdb_txn_renew0(MDB_txn *txn) } txn->mt_txnid = r->mr_txnid = env->me_txns->mti_txnid; txn->mt_u.reader = r; + meta = env->me_metas[txn->mt_txnid & 1]; } - txn->mt_toggle = txn->mt_txnid & 1; } else { LOCK_MUTEX_W(env); txn->mt_txnid = env->me_txns->mti_txnid; - txn->mt_toggle = txn->mt_txnid & 1; + meta = env->me_metas[txn->mt_txnid & 1]; txn->mt_txnid++; #if MDB_DEBUG if (txn->mt_txnid == mdb_debug_start) @@ -2196,10 +2193,10 @@ mdb_txn_renew0(MDB_txn *txn) } /* Copy the DB info and flags */ - memcpy(txn->mt_dbs, env->me_metas[txn->mt_toggle]->mm_dbs, 2 * sizeof(MDB_db)); + memcpy(txn->mt_dbs, meta->mm_dbs, 2 * sizeof(MDB_db)); /* Moved to here to avoid a data race in read TXNs */ - txn->mt_next_pgno = env->me_metas[txn->mt_toggle]->mm_last_pg+1; + txn->mt_next_pgno = meta->mm_last_pg+1; for (i=2; imt_numdbs; i++) { x = env->me_dbflags[i]; @@ -2295,7 +2292,6 @@ mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret) return ENOMEM; } txn->mt_txnid = parent->mt_txnid; - txn->mt_toggle = parent->mt_toggle; txn->mt_dirty_room = parent->mt_dirty_room; txn->mt_u.dirty_list[0].mid = 0; txn->mt_spill_pgs = NULL; @@ -3093,7 +3089,7 @@ mdb_env_write_meta(MDB_txn *txn) assert(txn != NULL); assert(txn->mt_env != NULL); - toggle = !txn->mt_toggle; + toggle = txn->mt_txnid & 1; DPRINTF(("writing meta page %d for root page %"Z"u", toggle, txn->mt_dbs[MAIN_DBI].md_root)); @@ -4878,7 +4874,7 @@ mdb_get(MDB_txn *txn, MDB_dbi dbi, if (txn->mt_flags & MDB_TXN_ERROR) return MDB_BAD_TXN; - if (key->mv_size == 0 || key->mv_size > MDB_MAXKEYSIZE) { + if (key->mv_size > MDB_MAXKEYSIZE) { return MDB_BAD_VALSIZE; } @@ -5107,7 +5103,8 @@ mdb_cursor_set(MDB_cursor *mc, MDB_val *key, MDB_val *data, assert(mc); assert(key); - assert(key->mv_size > 0); + if (key->mv_size == 0) + return MDB_BAD_VALSIZE; if (mc->mc_xcursor) mc->mc_xcursor->mx_cursor.mc_flags &= ~(C_INITIALIZED|C_EOF); @@ -5431,7 +5428,7 @@ mdb_cursor_get(MDB_cursor *mc, MDB_val *key, MDB_val *data, case MDB_SET_RANGE: if (key == NULL) { rc = EINVAL; - } else if (key->mv_size == 0 || key->mv_size > MDB_MAXKEYSIZE) { + } else if (key->mv_size > MDB_MAXKEYSIZE) { rc = MDB_BAD_VALSIZE; } else if (op == MDB_SET_RANGE) rc = mdb_cursor_set(mc, key, data, op, NULL); @@ -6051,7 +6048,6 @@ mdb_cursor_del(MDB_cursor *mc, unsigned int flags) if (!(flags & MDB_NOSPILL) && (rc = mdb_page_spill(mc, NULL, NULL))) return rc; - flags &= ~MDB_NOSPILL; /* TODO: Or change (flags != MDB_NODUPDATA) to ~(flags & MDB_NODUPDATA), not looking at the logic of that code just now */ rc = mdb_cursor_touch(mc); if (rc) @@ -7301,7 +7297,7 @@ mdb_del(MDB_txn *txn, MDB_dbi dbi, if (txn->mt_flags & (MDB_TXN_RDONLY|MDB_TXN_ERROR)) return (txn->mt_flags & MDB_TXN_RDONLY) ? EACCES : MDB_BAD_TXN; - if (key->mv_size == 0 || key->mv_size > MDB_MAXKEYSIZE) { + if (key->mv_size > MDB_MAXKEYSIZE) { return MDB_BAD_VALSIZE; } @@ -7765,13 +7761,6 @@ mdb_put(MDB_txn *txn, MDB_dbi dbi, if (txn == NULL || !dbi || dbi >= txn->mt_numdbs || !(txn->mt_dbflags[dbi] & DB_VALID)) return EINVAL; - if (txn->mt_flags & (MDB_TXN_RDONLY|MDB_TXN_ERROR)) - return (txn->mt_flags & MDB_TXN_RDONLY) ? EACCES : MDB_BAD_TXN; - - if (key->mv_size == 0 || key->mv_size > MDB_MAXKEYSIZE) { - return MDB_BAD_VALSIZE; - } - if ((flags & (MDB_NOOVERWRITE|MDB_NODUPDATA|MDB_RESERVE|MDB_APPEND|MDB_APPENDDUP)) != flags) return EINVAL; -- 2.7.4