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mdbx: add mdbx_get_maxkeysize().

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This commit is contained in:
Leo Yuriev 2017-03-31 17:51:42 +03:00
parent 5c5ef256b3
commit a2593625cc
2 changed files with 34 additions and 11 deletions
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1
mdbx.h
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@ -925,6 +925,7 @@ LIBMDBX_API int mdbx_env_set_maxdbs(MDB_env *env, MDB_dbi dbs);
* Returns The maximum size of a key we can write
*/
LIBMDBX_API int mdbx_env_get_maxkeysize(MDB_env *env);
LIBMDBX_API int mdbx_get_maxkeysize(size_t pagesize);
/* Set application information associated with the MDB_env.
*

44
src/mdbx.c
View File

@ -3586,14 +3586,42 @@ fail:
return rc;
}
int __cold mdbx_env_get_maxkeysize(MDB_env *env) {
if (!env || env->me_signature != MDBX_ME_SIGNATURE || !env->me_maxkey_limit)
return EINVAL;
return env->me_maxkey_limit;
}
static __inline ssize_t mdbx_calc_nodemax(ssize_t pagesize) {
assert(pagesize > 0);
return (((pagesize - PAGEHDRSZ) / MDB_MINKEYS) & -(ssize_t)2) -
sizeof(indx_t);
}
static __inline ssize_t mdbx_calc_maxkey(ssize_t nodemax) {
assert(nodemax > 0);
return nodemax - (NODESIZE + sizeof(MDB_db));
}
int mdbx_get_maxkeysize(size_t pagesize) {
if (pagesize == 0)
pagesize = mdbx_syspagesize();
ssize_t nodemax = mdbx_calc_nodemax(pagesize);
if (nodemax < 0)
return -EINVAL;
ssize_t maxkey = mdbx_calc_maxkey(nodemax);
return (maxkey > 0 && maxkey < INT_MAX) ? (int)maxkey : -EINVAL;
}
static void __cold mdbx_env_setup_limits(MDB_env *env, size_t pagesize) {
env->me_maxfree_1pg = (pagesize - PAGEHDRSZ) / sizeof(pgno_t) - 1;
env->me_nodemax =
(((pagesize - PAGEHDRSZ) / MDB_MINKEYS) & -2) - sizeof(indx_t);
env->me_maxkey_limit = env->me_nodemax - (NODESIZE + sizeof(MDB_db));
assert(env->me_maxkey_limit > 42 && env->me_maxkey_limit < pagesize);
env->me_maxpg = env->me_mapsize / pagesize;
env->me_nodemax = mdbx_calc_nodemax(pagesize);
env->me_maxkey_limit = mdbx_calc_maxkey(env->me_nodemax);
assert(env->me_maxkey_limit > 42 && env->me_maxkey_limit < pagesize);
}
int __cold mdbx_env_create(MDB_env **env) {
@ -9066,12 +9094,6 @@ int mdbx_set_dupsort(MDB_txn *txn, MDB_dbi dbi, MDB_cmp_func *cmp) {
return MDB_SUCCESS;
}
int __cold mdbx_env_get_maxkeysize(MDB_env *env) {
if (!env || env->me_signature != MDBX_ME_SIGNATURE || !env->me_maxkey_limit)
return EINVAL;
return env->me_maxkey_limit;
}
int __cold mdbx_reader_list(MDB_env *env, MDB_msg_func *func, void *ctx) {
unsigned i, snap_nreaders;
MDB_reader *mr;