* REDIS-URL -> META-URL

* META-ADDR -> META-URL

* cleanup leaked inodes

* check with entries

* cleanup leaked inodes in Redis

* fix test

* invalidate read buffer after truncate

* no accesslog for truncate (included in setattr)

* use sql database as meta store

* pass simple tests

* use bytes for chunks

* use bytes for chunks

* cleanup trasaction

* cleanup

* add unit test for SQL

* cleanup

* cleanup

* fix build

* use db as meta store

* fix contention

* fix truncate and compaction

* fix contension on counter

* generate id in batch

* fix build

* fix test

* fix flaky test

* support mysql

* fix ci

* fix flaky test

* test with sqlite3

* update column as notnull

* remove passwd

* update metrics

* fix nextInode and deleted files

* cleanup zero ref for slices

* cleanup old refs for slices

* allow delete chunks in gc

* fix dead loop

* remove keys

* add a option to compact all chunks in GC

* update logging

* fix info

* fix compact

* increase cache size

* use object.Object as interface

* fix unit test

* fix coping permission

* fix serialization of mtime

* check existence of blocks

* fix size of last block

* add gc and fsck into travis

* update tests

* update license header

* use file in tests

* umount force

* disable check for PEM

* fix travis

* fix travis

* garbage collection for objects

* delete in parallel

* fix tests

* add progress bar

* cleanup