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Kill magic numbers for NUM_METAS, databases

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mdb.RE/0.9
Hallvard Furuseth 9 years ago
parent 8901d9cfbc
commit bde5c231bc
1 changed files with 53 additions and 48 deletions
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  1. 101
      libraries/liblmdb/mdb.c

101
libraries/liblmdb/mdb.c
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@ -943,6 +943,11 @@ typedef struct MDB_db {
#define FREE_DBI 0
/** Handle for the default DB. */
#define MAIN_DBI 1
/** Number of DBs in metapage (free and main) - also hardcoded elsewhere */
#define CORE_DBS 2
/** Number of meta pages - also hardcoded elsewhere */
#define NUM_METAS 2
/** Meta page content.
* A meta page is the start point for accessing a database snapshot.
@ -956,11 +961,11 @@ typedef struct MDB_meta {
uint32_t mm_version;
void *mm_address; /**< address for fixed mapping */
size_t mm_mapsize; /**< size of mmap region */
MDB_db mm_dbs[2]; /**< first is free space, 2nd is main db */
MDB_db mm_dbs[CORE_DBS]; /**< first is free space, 2nd is main db */
/** The size of pages used in this DB */
#define mm_psize mm_dbs[0].md_pad
#define mm_psize mm_dbs[FREE_DBI].md_pad
/** Any persistent environment flags. @ref mdb_env */
#define mm_flags mm_dbs[0].md_flags
#define mm_flags mm_dbs[FREE_DBI].md_flags
pgno_t mm_last_pg; /**< last used page in file */
volatile txnid_t mm_txnid; /**< txnid that committed this page */
} MDB_meta;
@ -1175,7 +1180,7 @@ struct MDB_env {
char *me_path; /**< path to the DB files */
char *me_map; /**< the memory map of the data file */
MDB_txninfo *me_txns; /**< the memory map of the lock file or NULL */
MDB_meta *me_metas[2]; /**< pointers to the two meta pages */
MDB_meta *me_metas[NUM_METAS]; /**< pointers to the two meta pages */
void *me_pbuf; /**< scratch area for DUPSORT put() */
MDB_txn *me_txn; /**< current write transaction */
MDB_txn *me_txn0; /**< prealloc'd write transaction */
@ -1624,9 +1629,10 @@ static void mdb_audit(MDB_txn *txn)
mdb_tassert(txn, rc == MDB_NOTFOUND);
}
}
if (freecount + count + 2 /* metapages */ != txn->mt_next_pgno) {
if (freecount + count + NUM_METAS != txn->mt_next_pgno) {
fprintf(stderr, "audit: %lu freecount: %lu count: %lu total: %lu next_pgno: %lu\n",
txn->mt_txnid, freecount, count+2, freecount+count+2, txn->mt_next_pgno);
txn->mt_txnid, freecount, count+NUM_METAS,
freecount+count+NUM_METAS, txn->mt_next_pgno);
}
}
#endif
@ -1895,7 +1901,7 @@ mdb_page_spill(MDB_cursor *m0, MDB_val *key, MDB_val *data)
/* Estimate how much space this op will take */
i = m0->mc_db->md_depth;
/* Named DBs also dirty the main DB */
if (m0->mc_dbi > MAIN_DBI)
if (m0->mc_dbi >= CORE_DBS)
i += txn->mt_dbs[MAIN_DBI].md_depth;
/* For puts, roughly factor in the key+data size */
if (key)
@ -2664,7 +2670,7 @@ mdb_txn_renew0(MDB_txn *txn)
}
/* Copy the DB info and flags */
memcpy(txn->mt_dbs, meta->mm_dbs, 2 * sizeof(MDB_db));
memcpy(txn->mt_dbs, meta->mm_dbs, CORE_DBS * sizeof(MDB_db));
/* Moved to here to avoid a data race in read TXNs */
txn->mt_next_pgno = meta->mm_last_pg+1;
@ -2673,7 +2679,7 @@ mdb_txn_renew0(MDB_txn *txn)
/* Setup db info */
txn->mt_numdbs = env->me_numdbs;
for (i=2; i<txn->mt_numdbs; i++) {
for (i=CORE_DBS; i<txn->mt_numdbs; i++) {
x = env->me_dbflags[i];
txn->mt_dbs[i].md_flags = x & PERSISTENT_FLAGS;
txn->mt_dbflags[i] = (x & MDB_VALID) ? DB_VALID|DB_USRVALID|DB_STALE : 0;
@ -2834,7 +2840,7 @@ mdb_dbis_update(MDB_txn *txn, int keep)
MDB_env *env = txn->mt_env;
unsigned char *tdbflags = txn->mt_dbflags;
for (i = n; --i >= 2;) {
for (i = n; --i >= CORE_DBS;) {
if (tdbflags[i] & DB_NEW) {
if (keep) {
env->me_dbflags[i] = txn->mt_dbs[i].md_flags | MDB_VALID;
@ -3356,9 +3362,9 @@ mdb_txn_commit(MDB_txn *txn)
/* Update parent's DB table. */
memcpy(parent->mt_dbs, txn->mt_dbs, txn->mt_numdbs * sizeof(MDB_db));
parent->mt_numdbs = txn->mt_numdbs;
parent->mt_dbflags[0] = txn->mt_dbflags[0];
parent->mt_dbflags[1] = txn->mt_dbflags[1];
for (i=2; i<txn->mt_numdbs; i++) {
parent->mt_dbflags[FREE_DBI] = txn->mt_dbflags[FREE_DBI];
parent->mt_dbflags[MAIN_DBI] = txn->mt_dbflags[MAIN_DBI];
for (i=CORE_DBS; i<txn->mt_numdbs; i++) {
/* preserve parent's DB_NEW status */
x = parent->mt_dbflags[i] & DB_NEW;
parent->mt_dbflags[i] = txn->mt_dbflags[i] | x;
@ -3459,14 +3465,14 @@ mdb_txn_commit(MDB_txn *txn)
txn->mt_txnid, (void*)txn, (void*)env, txn->mt_dbs[MAIN_DBI].md_root));
/* Update DB root pointers */
if (txn->mt_numdbs > 2) {
if (txn->mt_numdbs > CORE_DBS) {
MDB_cursor mc;
MDB_dbi i;
MDB_val data;
data.mv_size = sizeof(MDB_db);
mdb_cursor_init(&mc, txn, MAIN_DBI, NULL);
for (i = 2; i < txn->mt_numdbs; i++) {
for (i = CORE_DBS; i < txn->mt_numdbs; i++) {
if (txn->mt_dbflags[i] & DB_DIRTY) {
if (TXN_DBI_CHANGED(txn, i)) {
rc = MDB_BAD_DBI;
@ -3527,7 +3533,7 @@ mdb_env_read_header(MDB_env *env, MDB_meta *meta)
* Read both meta pages so we can use the latest one.
*/
for (i=off=0; i<2; i++, off = meta->mm_psize) {
for (i=off=0; i<NUM_METAS; i++, off += meta->mm_psize) {
#ifdef _WIN32
DWORD len;
OVERLAPPED ov;
@ -3580,11 +3586,11 @@ mdb_env_init_meta0(MDB_env *env, MDB_meta *meta)
meta->mm_version = MDB_DATA_VERSION;
meta->mm_mapsize = env->me_mapsize;
meta->mm_psize = env->me_psize;
meta->mm_last_pg = 1;
meta->mm_last_pg = NUM_METAS-1;
meta->mm_flags = env->me_flags & 0xffff;
meta->mm_flags |= MDB_INTEGERKEY;
meta->mm_dbs[0].md_root = P_INVALID;
meta->mm_dbs[1].md_root = P_INVALID;
meta->mm_flags |= MDB_INTEGERKEY; /* this is mm_dbs[FREE_DBI].md_flags */
meta->mm_dbs[FREE_DBI].md_root = P_INVALID;
meta->mm_dbs[MAIN_DBI].md_root = P_INVALID;
}
/** Write the environment parameters of a freshly created DB environment.
@ -3617,7 +3623,7 @@ mdb_env_init_meta(MDB_env *env, MDB_meta *meta)
psize = env->me_psize;
p = calloc(2, psize);
p = calloc(NUM_METAS, psize);
if (!p)
return ENOMEM;
@ -3630,10 +3636,10 @@ mdb_env_init_meta(MDB_env *env, MDB_meta *meta)
q->mp_flags = P_META;
*(MDB_meta *)METADATA(q) = *meta;
DO_PWRITE(rc, env->me_fd, p, psize * 2, len, 0);
DO_PWRITE(rc, env->me_fd, p, psize * NUM_METAS, len, 0);
if (!rc)
rc = ErrCode();
else if ((unsigned) len == psize * 2)
else if ((unsigned) len == psize * NUM_METAS)
rc = MDB_SUCCESS;
else
rc = ENOSPC;
@ -3676,8 +3682,8 @@ mdb_env_write_meta(MDB_txn *txn)
if (flags & MDB_WRITEMAP) {
mp->mm_mapsize = mapsize;
mp->mm_dbs[0] = txn->mt_dbs[0];
mp->mm_dbs[1] = txn->mt_dbs[1];
mp->mm_dbs[FREE_DBI] = txn->mt_dbs[FREE_DBI];
mp->mm_dbs[MAIN_DBI] = txn->mt_dbs[MAIN_DBI];
mp->mm_last_pg = txn->mt_next_pgno - 1;
#if (__GNUC__ * 100 + __GNUC_MINOR__ >= 404) && /* TODO: portability */ \
!(defined(__i386__) || defined(__x86_64__))
@ -3708,8 +3714,8 @@ mdb_env_write_meta(MDB_txn *txn)
metab.mm_last_pg = env->me_metas[toggle]->mm_last_pg;
meta.mm_mapsize = mapsize;
meta.mm_dbs[0] = txn->mt_dbs[0];
meta.mm_dbs[1] = txn->mt_dbs[1];
meta.mm_dbs[FREE_DBI] = txn->mt_dbs[FREE_DBI];
meta.mm_dbs[MAIN_DBI] = txn->mt_dbs[MAIN_DBI];
meta.mm_last_pg = txn->mt_next_pgno - 1;
meta.mm_txnid = txn->mt_txnid;
@ -3794,7 +3800,7 @@ mdb_env_create(MDB_env **env)
return ENOMEM;
e->me_maxreaders = DEFAULT_READERS;
e->me_maxdbs = e->me_numdbs = 2;
e->me_maxdbs = e->me_numdbs = CORE_DBS;
e->me_fd = INVALID_HANDLE_VALUE;
e->me_lfd = INVALID_HANDLE_VALUE;
e->me_mfd = INVALID_HANDLE_VALUE;
@ -3932,7 +3938,7 @@ mdb_env_set_maxdbs(MDB_env *env, MDB_dbi dbs)
{
if (env->me_map)
return EINVAL;
env->me_maxdbs = dbs + 2; /* Named databases + main and free DB */
env->me_maxdbs = dbs + CORE_DBS;
return MDB_SUCCESS;
}
@ -4774,7 +4780,7 @@ mdb_env_close0(MDB_env *env, int excl)
/* Doing this here since me_dbxs may not exist during mdb_env_close */
if (env->me_dbxs) {
for (i = env->me_maxdbs; --i > MAIN_DBI; )
for (i = env->me_maxdbs; --i >= CORE_DBS; )
free(env->me_dbxs[i].md_name.mv_data);
free(env->me_dbxs);
}
@ -6170,7 +6176,7 @@ mdb_cursor_touch(MDB_cursor *mc)
{
int rc = MDB_SUCCESS;
if (mc->mc_dbi > MAIN_DBI && !(*mc->mc_dbflag & DB_DIRTY)) {
if (mc->mc_dbi >= CORE_DBS && !(*mc->mc_dbflag & DB_DIRTY)) {
MDB_cursor mc2;
MDB_xcursor mcx;
if (TXN_DBI_CHANGED(mc->mc_txn, mc->mc_dbi))
@ -7294,8 +7300,7 @@ mdb_cursor_open(MDB_txn *txn, MDB_dbi dbi, MDB_cursor **ret)
if (txn->mt_flags & MDB_TXN_BLOCKED)
return MDB_BAD_TXN;
/* Allow read access to the freelist */
if (!dbi && !F_ISSET(txn->mt_flags, MDB_TXN_RDONLY))
if (dbi == FREE_DBI && !F_ISSET(txn->mt_flags, MDB_TXN_RDONLY))
return EINVAL;
if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT)
@ -8871,7 +8876,7 @@ mdb_env_copyfd1(MDB_env *env, HANDLE fd)
my.mc_wlen[1] = 0;
my.mc_olen[0] = 0;
my.mc_olen[1] = 0;
my.mc_next_pgno = 2;
my.mc_next_pgno = NUM_METAS;
my.mc_status = 0;
my.mc_new = 1;
my.mc_toggle = 0;
@ -8884,7 +8889,7 @@ mdb_env_copyfd1(MDB_env *env, HANDLE fd)
return rc;
mp = (MDB_page *)my.mc_wbuf[0];
memset(mp, 0, 2*env->me_psize);
memset(mp, 0, NUM_METAS * env->me_psize);
mp->mp_pgno = 0;
mp->mp_flags = P_META;
mm = (MDB_meta *)METADATA(mp);
@ -8907,27 +8912,27 @@ mdb_env_copyfd1(MDB_env *env, HANDLE fd)
mdb_cursor_init(&mc, txn, FREE_DBI, NULL);
while ((rc = mdb_cursor_get(&mc, &key, &data, MDB_NEXT)) == 0)
freecount += *(MDB_ID *)data.mv_data;
freecount += txn->mt_dbs[0].md_branch_pages +
txn->mt_dbs[0].md_leaf_pages +
txn->mt_dbs[0].md_overflow_pages;
freecount += txn->mt_dbs[FREE_DBI].md_branch_pages +
txn->mt_dbs[FREE_DBI].md_leaf_pages +
txn->mt_dbs[FREE_DBI].md_overflow_pages;
/* Set metapage 1 */
mm->mm_last_pg = txn->mt_next_pgno - freecount - 1;
mm->mm_dbs[1] = txn->mt_dbs[1];
if (mm->mm_last_pg > 1) {
mm->mm_dbs[1].md_root = mm->mm_last_pg;
mm->mm_dbs[MAIN_DBI] = txn->mt_dbs[MAIN_DBI];
if (mm->mm_last_pg > NUM_METAS-1) {
mm->mm_dbs[MAIN_DBI].md_root = mm->mm_last_pg;
mm->mm_txnid = 1;
} else {
mm->mm_dbs[1].md_root = P_INVALID;
mm->mm_dbs[MAIN_DBI].md_root = P_INVALID;
}
}
my.mc_wlen[0] = env->me_psize * 2;
my.mc_wlen[0] = env->me_psize * NUM_METAS;
my.mc_txn = txn;
pthread_mutex_lock(&my.mc_mutex);
while(my.mc_new)
pthread_cond_wait(&my.mc_cond, &my.mc_mutex);
pthread_mutex_unlock(&my.mc_mutex);
rc = mdb_env_cwalk(&my, &txn->mt_dbs[1].md_root, 0);
rc = mdb_env_cwalk(&my, &txn->mt_dbs[MAIN_DBI].md_root, 0);
if (rc == MDB_SUCCESS && my.mc_wlen[my.mc_toggle])
rc = mdb_env_cthr_toggle(&my, 1);
mdb_env_cthr_toggle(&my, -1);
@ -8991,7 +8996,7 @@ mdb_env_copyfd0(MDB_env *env, HANDLE fd)
}
}
wsize = env->me_psize * 2;
wsize = env->me_psize * NUM_METAS;
ptr = env->me_map;
w2 = wsize;
while (w2 > 0) {
@ -9309,7 +9314,7 @@ int mdb_dbi_open(MDB_txn *txn, const char *name, unsigned int flags, MDB_dbi *db
/* Is the DB already open? */
len = strlen(name);
for (i=2; i<txn->mt_numdbs; i++) {
for (i=CORE_DBS; i<txn->mt_numdbs; i++) {
if (!txn->mt_dbxs[i].md_name.mv_size) {
/* Remember this free slot */
if (!unused) unused = i;
@ -9398,7 +9403,7 @@ mdb_stat(MDB_txn *txn, MDB_dbi dbi, MDB_stat *arg)
void mdb_dbi_close(MDB_env *env, MDB_dbi dbi)
{
char *ptr;
if (dbi <= MAIN_DBI || dbi >= env->me_maxdbs)
if (dbi < CORE_DBS || dbi >= env->me_maxdbs)
return;
ptr = env->me_dbxs[dbi].md_name.mv_data;
/* If there was no name, this was already closed */
@ -9535,7 +9540,7 @@ int mdb_drop(MDB_txn *txn, MDB_dbi dbi, int del)
goto leave;
/* Can't delete the main DB */
if (del && dbi > MAIN_DBI) {
if (del && dbi >= CORE_DBS) {
rc = mdb_del0(txn, MAIN_DBI, &mc->mc_dbx->md_name, NULL, F_SUBDATA);
if (!rc) {
txn->mt_dbflags[dbi] = DB_STALE;

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