drop discarded funciton (#71)

librocksdb_sys/crocksdb/c.cc

@@ -1710,11 +1710,6 @@ void crocksdb_options_set_manifest_preallocation_size(
 void crocksdb_options_set_purge_redundant_kvs_while_flush(crocksdb_options_t* opt,
                                                          unsigned char v) {}
 
-void crocksdb_options_set_allow_os_buffer(crocksdb_options_t* opt,
-                                         unsigned char v) {
-  opt->rep.allow_os_buffer = v;
-}
-
 void crocksdb_options_set_allow_mmap_reads(
     crocksdb_options_t* opt, unsigned char v) {
   opt->rep.allow_mmap_reads = v;

librocksdb_sys/crocksdb/rocksdb/c.h

@@ -655,8 +655,6 @@ extern C_ROCKSDB_LIBRARY_API void crocksdb_options_set_manifest_preallocation_si
 extern C_ROCKSDB_LIBRARY_API void
 crocksdb_options_set_purge_redundant_kvs_while_flush(crocksdb_options_t*,
                                                     unsigned char);
-extern C_ROCKSDB_LIBRARY_API void crocksdb_options_set_allow_os_buffer(
-    crocksdb_options_t*, unsigned char);
 extern C_ROCKSDB_LIBRARY_API void crocksdb_options_set_allow_mmap_reads(
     crocksdb_options_t*, unsigned char);
 extern C_ROCKSDB_LIBRARY_API void crocksdb_options_set_allow_mmap_writes(

librocksdb_sys/src/lib.rs

@@ -147,7 +147,6 @@ extern "C" {
     pub fn crocksdb_options_set_use_fsync(options: *mut DBOptions, v: c_int);
     pub fn crocksdb_options_set_bytes_per_sync(options: *mut DBOptions, bytes: u64);
     pub fn crocksdb_options_set_disable_data_sync(options: *mut DBOptions, v: c_int);
-    pub fn crocksdb_options_set_allow_os_buffer(options: *mut DBOptions, is_allow: bool);
     pub fn crocksdb_options_optimize_for_point_lookup(options: *mut DBOptions,
                                                      block_cache_size_mb: u64);
     pub fn crocksdb_options_set_table_cache_numshardbits(options: *mut DBOptions, bits: c_int);

src/rocksdb_options.rs

@@ -382,12 +382,6 @@ impl Options {
         }
     }
 
-    pub fn allow_os_buffer(&mut self, is_allow: bool) {
-        unsafe {
-            crocksdb_ffi::crocksdb_options_set_allow_os_buffer(self.inner, is_allow);
-        }
-    }
-
     pub fn set_table_cache_num_shard_bits(&mut self, nbits: c_int) {
         unsafe {
             crocksdb_ffi::crocksdb_options_set_table_cache_numshardbits(self.inner, nbits);