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lmdb: Renumber MDB_TXN_* flags, simplify flag code.

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Change-Id: I91b0836a84ce80049dbe0829dfc3101fae94c7c9
This commit is contained in:
Hallvard Furuseth
2015-04-08 21:51:16 +02:00
committed by Leo Yuriev
parent 5daf811dcb
commit c4097ec898
1 changed files with 25 additions and 15 deletions
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40
mdb.c
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@@ -1224,7 +1224,13 @@ struct MDB_txn {
* @ingroup internal
* @{
*/
#define MDB_TXN_RDONLY 0x01 /**< read-only transaction */
/** #mdb_txn_begin() flags */
#define MDB_TXN_BEGIN_FLAGS (MDB_NOMETASYNC|MDB_NOSYNC|MDB_RDONLY)
#define MDB_TXN_NOMETASYNC MDB_NOMETASYNC /**< don't sync meta for this txn on commit */
#define MDB_TXN_NOSYNC MDB_NOSYNC /**< don't sync this txn on commit */
#define MDB_TXN_RDONLY MDB_RDONLY /**< read-only transaction */
/* internal txn flags */
#define MDB_TXN_WRITEMAP MDB_WRITEMAP /**< copy of #MDB_env flag in writers */
#define MDB_TXN_ERROR 0x02 /**< txn is unusable after an error */
#define MDB_TXN_DIRTY 0x04 /**< must write, even if dirty list is empty */
#define MDB_TXN_SPILLS 0x08 /**< txn or a parent has spilled pages */
@@ -2228,7 +2234,7 @@ mdb_page_dirty(MDB_txn *txn, MDB_page *mp)
MDB_ID2 mid;
int rc, (*insert)(MDB_ID2L, MDB_ID2 *);
if (txn->mt_env->me_flags & MDB_WRITEMAP) {
if (txn->mt_flags & MDB_TXN_WRITEMAP) {
insert = mdb_mid2l_append;
} else {
insert = mdb_mid2l_insert;
@@ -2953,7 +2959,7 @@ mdb_txn_renew0(MDB_txn *txn)
int rc, new_notls = 0;
if (txn->mt_flags & MDB_TXN_RDONLY) {
txn->mt_flags = MDB_TXN_RDONLY;
txn->mt_flags &= MDB_TXN_BEGIN_FLAGS;
/* Setup db info */
txn->mt_numdbs = env->me_numdbs;
txn->mt_dbxs = env->me_dbxs; /* mostly static anyway */
@@ -3110,18 +3116,20 @@ mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
MDB_ntxn *ntxn;
int rc, size, tsize = sizeof(MDB_txn);
flags &= MDB_TXN_BEGIN_FLAGS;
flags |= env->me_flags & MDB_WRITEMAP;
if (env->me_flags & MDB_FATAL_ERROR) {
DPUTS("environment had fatal error, must shutdown!");
return MDB_PANIC;
}
if ((env->me_flags & MDB_RDONLY) && !(flags & MDB_RDONLY))
if (env->me_flags & MDB_RDONLY & ~flags) /* write txn in RDONLY env */
return EACCES;
if (parent) {
/* Nested transactions: Max 1 child, write txns only, no writemap */
if (parent->mt_child ||
(flags & MDB_RDONLY) ||
(parent->mt_flags & (MDB_TXN_RDONLY|MDB_TXN_ERROR)) ||
(env->me_flags & MDB_WRITEMAP))
((flags | parent->mt_flags) &
(MDB_RDONLY|MDB_WRITEMAP|MDB_TXN_ERROR)))
{
return (parent->mt_flags & MDB_TXN_RDONLY) ? EINVAL : MDB_BAD_TXN;
}
@@ -3144,7 +3152,6 @@ mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
}
txn->mt_dbs = (MDB_db *) ((char *)txn + tsize);
if (flags & MDB_RDONLY) {
txn->mt_flags |= MDB_TXN_RDONLY;
txn->mt_dbflags = (unsigned char *)(txn->mt_dbs + env->me_maxdbs);
txn->mt_dbiseqs = env->me_dbiseqs;
} else {
@@ -3158,6 +3165,7 @@ mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
}
txn->mt_dbxs = env->me_dbxs;
}
txn->mt_flags = flags;
txn->mt_env = env;
ok:
@@ -3209,7 +3217,7 @@ ok:
} else {
*ret = txn;
DPRINTF(("begin txn %"Z"u%c %p on mdbenv %p, root page %"Z"u",
txn->mt_txnid, (txn->mt_flags & MDB_TXN_RDONLY) ? 'r' : 'w',
txn->mt_txnid, (flags & MDB_RDONLY) ? 'r' : 'w',
(void *) txn, (void *) env, txn->mt_dbs[MAIN_DBI].md_root));
}
@@ -4223,7 +4231,8 @@ static int
mdb_env_write_meta(MDB_txn *txn, int force)
{
MDB_env *env;
MDB_meta meta, metab, *mp;
MDB_meta meta, metab, *mp;
unsigned flags;
size_t mapsize;
off_t off;
int rc, len, toggle;
@@ -4240,13 +4249,14 @@ mdb_env_write_meta(MDB_txn *txn, int force)
toggle, txn->mt_dbs[MAIN_DBI].md_root));
env = txn->mt_env;
flags = txn->mt_flags & env->me_flags;
mp = env->me_metas[toggle];
mapsize = env->me_metas[toggle ^ 1]->mm_mapsize;
/* Persist any increases of mapsize config */
if (mapsize < env->me_mapsize)
mapsize = env->me_mapsize;
if (env->me_flags & MDB_WRITEMAP) {
if (flags & MDB_WRITEMAP) {
mp->mm_mapsize = mapsize;
mp->mm_dbs[0] = txn->mt_dbs[0];
mp->mm_dbs[1] = txn->mt_dbs[1];
@@ -4254,7 +4264,7 @@ mdb_env_write_meta(MDB_txn *txn, int force)
/* (LY) ITS#7969: issue a memory barrier, it is noop for x86. */
mdb_coherent_barrier();
mp->mm_txnid = txn->mt_txnid;
if (force || !(env->me_flags & (MDB_NOMETASYNC|MDB_NOSYNC))) {
if (force || !(flags & (MDB_NOMETASYNC|MDB_NOSYNC))) {
unsigned meta_size = env->me_psize;
int flags = (!force && (env->me_flags & MDB_MAPASYNC)) ? MS_ASYNC : MS_SYNC;
ptr = env->me_map;
@@ -4296,8 +4306,8 @@ mdb_env_write_meta(MDB_txn *txn, int force)
off += PAGEHDRSZ;
/* Write to the SYNC fd */
mfd = (!force || (env->me_flags & (MDB_NOSYNC|MDB_NOMETASYNC))) ?
env->me_fd : env->me_mfd;
mfd = (force || !(flags & (MDB_NOSYNC|MDB_NOMETASYNC))) ?
env->me_mfd : env->me_fd;
#ifdef _WIN32
{
memset(&ov, 0, sizeof(ov));
@@ -5728,7 +5738,7 @@ mdb_page_get(MDB_txn *txn, pgno_t pgno, MDB_page **ret, int *lvl)
MDB_page *p = NULL;
int level;
if (!((txn->mt_flags & MDB_TXN_RDONLY) | (env->me_flags & MDB_WRITEMAP))) {
if (! (txn->mt_flags & (MDB_TXN_RDONLY|MDB_TXN_WRITEMAP))) {
MDB_txn *tx2 = txn;
level = 1;
do {