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Fixup metapage writes

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This commit is contained in:
Howard Chu 2011-08-03 03:21:07 -07:00
parent 4fd0f278d2
commit 415d98755d
1 changed files with 32 additions and 26 deletions
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58
libraries/libmdb/mdb.c
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@ -229,7 +229,6 @@ typedef struct MDB_db {
} MDB_db;
struct MDB_txn {
pgno_t mt_root; /* current / new root page */
pgno_t mt_next_pgno; /* next unallocated page */
ULONG mt_txnid;
ULONG mt_oldest;
@ -241,6 +240,7 @@ struct MDB_txn {
} mt_u;
MDB_dbx *mt_dbxs; /* array */
MDB_db **mt_dbs; /* array of ptrs */
MDB_db mt_db0; /* just for write txns */
unsigned int mt_numdbs;
#define MDB_TXN_RDONLY 0x01 /* read-only transaction */
@ -520,13 +520,6 @@ mdb_txn_begin(MDB_env *env, int rdonly, MDB_txn **ret)
}
txn->mt_free_pgs[0] = 0;
}
/* Copy the DB arrays */
txn->mt_numdbs = env->me_numdbs;
rc = (txn->mt_numdbs % DBX_CHUNK) + 1;
txn->mt_dbxs = malloc(rc * DBX_CHUNK * sizeof(MDB_dbx));
txn->mt_dbs = malloc(rc * DBX_CHUNK * sizeof(MDB_db *));
memcpy(txn->mt_dbxs, env->me_dbxs, txn->mt_numdbs * sizeof(MDB_dbx));
memcpy(txn->mt_dbs, env->me_dbs, txn->mt_numdbs * sizeof(MDB_db *));
txn->mt_txnid = env->me_txns->mt_txnid;
if (rdonly) {
@ -563,13 +556,24 @@ mdb_txn_begin(MDB_env *env, int rdonly, MDB_txn **ret)
return rc;
}
if (toggle)
txn->mt_flags |= MDB_TXN_METOGGLE;
/* Copy the DB arrays */
txn->mt_numdbs = env->me_numdbs;
rc = (txn->mt_numdbs % DBX_CHUNK) + 1;
txn->mt_dbxs = malloc(rc * DBX_CHUNK * sizeof(MDB_dbx));
txn->mt_dbs = malloc(rc * DBX_CHUNK * sizeof(MDB_db *));
memcpy(txn->mt_dbxs, env->me_dbxs, txn->mt_numdbs * sizeof(MDB_dbx));
memcpy(txn->mt_dbs, env->me_dbs, txn->mt_numdbs * sizeof(MDB_db *));
if (!rdonly) {
memcpy(&txn->mt_db0, txn->mt_dbs[0], sizeof(txn->mt_db0));
txn->mt_dbs[0] = &txn->mt_db0;
if (toggle)
txn->mt_flags |= MDB_TXN_METOGGLE;
txn->mt_next_pgno = env->me_meta.mm_last_pg+1;
}
txn->mt_next_pgno = env->me_meta.mm_last_pg+1;
txn->mt_root = env->me_meta.mm_root;
DPRINTF("begin transaction %lu on mdbenv %p, root page %lu",
txn->mt_txnid, (void *) env, txn->mt_root);
txn->mt_txnid, (void *) env, txn->mt_dbs[0]->md_root);
*ret = txn;
return MDB_SUCCESS;
@ -586,7 +590,7 @@ mdb_txn_abort(MDB_txn *txn)
env = txn->mt_env;
DPRINTF("abort transaction %lu on mdbenv %p, root page %lu",
txn->mt_txnid, (void *) env, txn->mt_root);
txn->mt_txnid, (void *) env, txn->mt_dbs[0]->md_root);
free(txn->mt_dbs);
free(txn->mt_dbxs);
@ -667,7 +671,7 @@ mdb_txn_commit(MDB_txn *txn)
goto done;
DPRINTF("committing transaction %lu on mdbenv %p, root page %lu",
txn->mt_txnid, (void *) env, txn->mt_root);
txn->mt_txnid, (void *) env, txn->mt_dbs[0]->md_root);
/* Commit up to MDB_COMMIT_PAGES dirty pages to disk until done.
*/
@ -746,8 +750,10 @@ mdb_txn_commit(MDB_txn *txn)
MDB_dbx *p1 = env->me_dbxs;
MDB_db **p2 = env->me_dbs;
txn->mt_dbs[0] = env->me_dbs[0];
env->me_dbxs = txn->mt_dbxs;
env->me_dbs = txn->mt_dbs;
env->me_numdbs = txn->mt_numdbs;
free(p2);
free(p1);
@ -876,23 +882,25 @@ mdbenv_write_meta(MDB_txn *txn)
assert(txn != NULL);
assert(txn->mt_env != NULL);
DPRINTF("writing meta page for root page %lu", txn->mt_root);
DPRINTF("writing meta page for root page %lu", txn->mt_dbs[0]->md_root);
env = txn->mt_env;
ptr = (char *)&meta;
off = offsetof(MDB_meta, mm_depth);
off = offsetof(MDB_meta, mm_last_pg);
len = sizeof(MDB_meta) - off;
ptr += off;
meta.mm_last_pg = txn->mt_next_pgno - 1;
meta.mm_txnid = txn->mt_txnid;
meta.mm_psize = env->me_meta.mm_psize;
meta.mm_flags = env->me_meta.mm_flags;
meta.mm_depth = txn->mt_dbs[0]->md_depth;
meta.mm_branch_pages = txn->mt_dbs[0]->md_branch_pages;
meta.mm_leaf_pages = txn->mt_dbs[0]->md_leaf_pages;
meta.mm_overflow_pages = txn->mt_dbs[0]->md_overflow_pages;
meta.mm_entries = txn->mt_dbs[0]->md_entries;
meta.mm_root = txn->mt_root;
meta.mm_last_pg = txn->mt_next_pgno - 1;
meta.mm_txnid = txn->mt_txnid;
meta.mm_root = txn->mt_dbs[0]->md_root;
if (!F_ISSET(txn->mt_flags, MDB_TXN_METOGGLE))
off += env->me_meta.mm_psize;
@ -1212,6 +1220,8 @@ mdbenv_close(MDB_env *env)
if (env == NULL)
return;
free(env->me_dbs);
free(env->me_dbxs);
free(env->me_path);
if (env->me_map) {
@ -1440,7 +1450,7 @@ mdb_search_page(MDB_txn *txn, MDB_dbi dbi, MDB_val *key,
DPRINTF("transaction has failed, must abort");
return EINVAL;
} else
root = txn->mt_root;
root = txn->mt_dbs[dbi]->md_root;
if (root == P_INVALID) { /* Tree is empty. */
DPRINTF("tree is empty");
@ -1457,7 +1467,7 @@ mdb_search_page(MDB_txn *txn, MDB_dbi dbi, MDB_val *key,
mpp->mp_pi = 0;
if ((rc = mdb_touch(txn, mpp)))
return rc;
txn->mt_root = mpp->mp_page->mp_pgno;
txn->mt_dbs[dbi]->md_root = mpp->mp_page->mp_pgno;
}
return mdb_search_page_root(txn, dbi, key, cursor, modify, mpp);
@ -2313,8 +2323,6 @@ mdb_split(MDB_txn *txn, MDB_dbi dbi, MDB_page **mpp, unsigned int *newindxp,
mdp->h.md_pi = 0;
mdp->h.md_parent = &pdp->p;
txn->mt_dbs[dbi]->md_root = pdp->p.mp_pgno;
if (!dbi)
txn->mt_root = pdp->p.mp_pgno;
DPRINTF("root split! new root = %lu", pdp->p.mp_pgno);
txn->mt_dbs[dbi]->md_depth++;
@ -2490,8 +2498,6 @@ mdb_put(MDB_txn *txn, MDB_dbi dbi,
}
mpp.mp_page = &dp->p;
txn->mt_dbs[dbi]->md_root = mpp.mp_page->mp_pgno;
if (!dbi)
txn->mt_root = mpp.mp_page->mp_pgno;
txn->mt_dbs[dbi]->md_depth++;
ki = 0;
}