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Make sure cursor's DB is init'd if STALE.

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This commit is contained in:
Howard Chu 2012-07-17 04:02:48 -07:00
parent a0993354a6
commit 7e9a6134fd
1 changed files with 22 additions and 12 deletions
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34
libraries/libmdb/mdb.c
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@ -932,8 +932,10 @@ static int mdb_page_touch(MDB_cursor *mc);
static int mdb_page_get(MDB_txn *txn, pgno_t pgno, MDB_page **mp);
static int mdb_page_search_root(MDB_cursor *mc,
MDB_val *key, int modify);
#define MDB_PS_MODIFY 1
#define MDB_PS_ROOTONLY 2
static int mdb_page_search(MDB_cursor *mc,
MDB_val *key, int modify);
MDB_val *key, int flags);
static int mdb_page_merge(MDB_cursor *csrc, MDB_cursor *cdst);
static int mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata,
pgno_t newpgno, unsigned int nflags);
@ -1554,7 +1556,8 @@ mdb_txn_renew0(MDB_txn *txn)
memcpy(txn->mt_dbs, env->me_metas[txn->mt_toggle]->mm_dbs, 2 * sizeof(MDB_db));
for (i=2; i<txn->mt_numdbs; i++)
txn->mt_dbs[i].md_flags = env->me_dbflags[i];
memset(txn->mt_dbflags, DB_STALE, env->me_numdbs);
txn->mt_dbflags[0] = txn->mt_dbflags[1] = 0;
memset(txn->mt_dbflags+2, DB_STALE, env->me_numdbs-2);
return MDB_SUCCESS;
}
@ -1858,7 +1861,7 @@ mdb_txn_commit(MDB_txn *txn)
/* should only be one record now */
if (env->me_pghead) {
/* make sure first page of freeDB is touched and on freelist */
mdb_page_search(&mc, NULL, 1);
mdb_page_search(&mc, NULL, MDB_PS_MODIFY);
}
/* Delete IDLs we used from the free list */
@ -1887,7 +1890,7 @@ free2:
/* make sure last page of freeDB is touched and on freelist */
key.mv_size = MAXKEYSIZE+1;
key.mv_data = NULL;
mdb_page_search(&mc, &key, 1);
mdb_page_search(&mc, &key, MDB_PS_MODIFY);
mdb_midl_sort(txn->mt_free_pgs);
#if MDB_DEBUG > 1
@ -3371,7 +3374,8 @@ mdb_page_get(MDB_txn *txn, pgno_t pgno, MDB_page **ret)
* @param[in,out] mc the cursor for this operation.
* @param[in] key the key to search for. If NULL, search for the lowest
* page. (This is used by #mdb_cursor_first().)
* @param[in] modify If true, visited pages are updated with new page numbers.
* @param[in] flags If MDB_PS_MODIFY set, visited pages are updated with new page numbers.
* If MDB_PS_ROOTONLY set, just fetch root node, no further lookups.
* @return 0 on success, non-zero on failure.
*/
static int
@ -3453,7 +3457,7 @@ mdb_page_search_root(MDB_cursor *mc, MDB_val *key, int modify)
* @return 0 on success, non-zero on failure.
*/
static int
mdb_page_search(MDB_cursor *mc, MDB_val *key, int modify)
mdb_page_search(MDB_cursor *mc, MDB_val *key, int flags)
{
int rc;
pgno_t root;
@ -3468,11 +3472,11 @@ mdb_page_search(MDB_cursor *mc, MDB_val *key, int modify)
/* Make sure we're using an up-to-date root */
if (mc->mc_dbi > MAIN_DBI) {
if ((*mc->mc_dbflag & DB_STALE) ||
(modify && !(*mc->mc_dbflag & DB_DIRTY))) {
((flags & MDB_PS_MODIFY) && !(*mc->mc_dbflag & DB_DIRTY))) {
MDB_cursor mc2;
unsigned char dbflag = 0;
mdb_cursor_init(&mc2, mc->mc_txn, MAIN_DBI, NULL);
rc = mdb_page_search(&mc2, &mc->mc_dbx->md_name, modify);
rc = mdb_page_search(&mc2, &mc->mc_dbx->md_name, flags & MDB_PS_MODIFY);
if (rc)
return rc;
if (*mc->mc_dbflag & DB_STALE) {
@ -3485,7 +3489,7 @@ mdb_page_search(MDB_cursor *mc, MDB_val *key, int modify)
mdb_node_read(mc->mc_txn, leaf, &data);
memcpy(mc->mc_db, data.mv_data, sizeof(MDB_db));
}
if (modify)
if (flags & MDB_PS_MODIFY)
dbflag = DB_DIRTY;
*mc->mc_dbflag = dbflag;
}
@ -3508,12 +3512,15 @@ mdb_page_search(MDB_cursor *mc, MDB_val *key, int modify)
DPRINTF("db %u root page %zu has flags 0x%X",
mc->mc_dbi, root, mc->mc_pg[0]->mp_flags);
if (modify) {
if (flags & MDB_PS_MODIFY) {
if ((rc = mdb_page_touch(mc)))
return rc;
}
return mdb_page_search_root(mc, key, modify);
if (flags & MDB_PS_ROOTONLY)
return MDB_SUCCESS;
return mdb_page_search_root(mc, key, flags);
}
/** Return the data associated with a given node.
@ -4149,7 +4156,7 @@ mdb_cursor_touch(MDB_cursor *mc)
if (mc->mc_dbi > MAIN_DBI && !(*mc->mc_dbflag & DB_DIRTY)) {
MDB_cursor mc2;
mdb_cursor_init(&mc2, mc->mc_txn, MAIN_DBI, NULL);
rc = mdb_page_search(&mc2, &mc->mc_dbx->md_name, 1);
rc = mdb_page_search(&mc2, &mc->mc_dbx->md_name, MDB_PS_MODIFY);
if (rc)
return rc;
*mc->mc_dbflag = DB_DIRTY;
@ -4995,6 +5002,9 @@ mdb_cursor_init(MDB_cursor *mc, MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx)
} else {
mc->mc_xcursor = NULL;
}
if (*mc->mc_dbflag & DB_STALE) {
mdb_page_search(mc, NULL, MDB_PS_ROOTONLY);
}
}
int