K/V fixes after stress-test :-)

- track block versions correctly - per inode block (128kb) instead of tree block (4kb)
- prevent multiple parallel CAS writes of the same inode block
- add logging for EILSEQ which means invalid data in the tree
- fix get_block updated flag which was true for blocks already in cache and was leading to infinite loops on "unrelated block" errors
- apply changes to blocks in cache only after successful writes (using "virtual changes")
- do not replace cached block with an older version from disk
- recheck "unrelated blocks" (read/update collisions) until data stops changing
- track tree path correctly - do not treat split block as parent of its right half
- correctly move blocks when finding new empty place on disk
- restart updates from the beginning when one of blocks is changed by a parallel update
- fix delete using SET opcode and setting key to the empty value instead
- prevent changing the same key more than 1 time in parallel
- fix listing verification
- resume continue_updates in update_find (required because it uses continue_update itself)
- add allow_old_cached parameter to get()

src/kv_cli.cpp

@@ -73,7 +73,7 @@ json11::Json::object kv_cli_t::parse_args(int narg, const char *args[])
                 "Vitastor Key/Value CLI\n"
                 "(c) Vitaliy Filippov, 2023+ (VNPL-1.1)\n"
                 "\n"
-                "USAGE: %s [--etcd_address ADDR] [--inode INODE_ID] [OTHER OPTIONS]\n",
+                "USAGE: %s [--etcd_address ADDR] [OTHER OPTIONS]\n",
                 exe_name
             );
             exit(0);