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Try to avoid an invalid datafile after failed init

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Hallvard Furuseth 2014-12-08 09:56:36 +01:00
parent aa10c98f3f
commit f3d3f60e3d
1 changed files with 14 additions and 0 deletions
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14
libraries/liblmdb/mdb.c
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@ -4008,6 +4008,20 @@ mdb_env_open2(MDB_env *env)
}
meta.mm_mapsize = env->me_mapsize;
if (newenv && !(flags & MDB_FIXEDMAP)) {
/* mdb_env_map() may grow the datafile. Write the metapages
* first, so the file will be valid if initialization fails.
* Except with FIXEDMAP, since we do not yet know mm_address.
* We could fill in mm_address later, but then a different
* program might end up doing that - one with a memory layout
* and map address which does not suit the main program.
*/
rc = mdb_env_init_meta(env, &meta);
if (rc)
return rc;
newenv = 0;
}
rc = mdb_env_map(env, (flags & MDB_FIXEDMAP) ? meta.mm_address : NULL);
if (rc)
return rc;