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Partially revert 65d40eb5d2

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Allow both increasing and decreasing the environment size.
But don't allow decreasing below the currently occupied space.
This commit is contained in:
Howard Chu 2012-12-11 12:03:19 -08:00
parent 282be11654
commit e74d70e88e
2 changed files with 17 additions and 3 deletions
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3
libraries/liblmdb/lmdb.h
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@ -574,6 +574,9 @@ int mdb_env_get_path(MDB_env *env, const char **path);
* of the database. The value should be chosen as large as possible,
* to accommodate future growth of the database.
* This function may only be called after #mdb_env_create() and before #mdb_env_open().
* The size may be changed by closing and reopening the environment.
* Any attempt to set a size smaller than the space already consumed
* by the environment will be silently changed to the current size of the used space.
* @param[in] env An environment handle returned by #mdb_env_create()
* @param[in] size The size in bytes
* @return A non-zero error value on failure and 0 on success. Some possible

17
libraries/liblmdb/mdb.c
View file

@ -2722,11 +2722,22 @@ mdb_env_open2(MDB_env *env)
return i;
DPUTS("new mdbenv");
newenv = 1;
meta.mm_mapsize = env->me_mapsize > DEFAULT_MAPSIZE ? env->me_mapsize : DEFAULT_MAPSIZE;
}
if (env->me_mapsize < meta.mm_mapsize)
env->me_mapsize = meta.mm_mapsize;
/* Was a mapsize configured? */
if (!env->me_mapsize) {
/* If this is a new environment, take the default,
* else use the size recorded in the existing env.
*/
env->me_mapsize = newenv ? DEFAULT_MAPSIZE : meta.mm_mapsize;
} else if (env->me_mapsize < meta.mm_mapsize) {
/* If the configured size is smaller, make sure it's
* still big enough. Silently round up to minimum if not.
*/
size_t minsize = (meta.mm_last_pg + 1) * meta.mm_psize;
if (env->me_mapsize < minsize)
env->me_mapsize = minsize;
}
#ifdef _WIN32
{