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-MDS internal data structures
-==============================
-
-*CInode*
-  CInode contains the metadata of a file, there is one CInode for each file.
-  The CInode stores information like who owns the file, how big the file is.
-
-*CDentry*
-  CDentry is the glue that holds inodes and files together by relating inode to
-  file/directory names. A CDentry links to at most one CInode (it may not link
-  to any CInode). A CInode may be linked by multiple CDentries.
-
-*CDir*
-  CDir only exists for directory inode, it's used to link CDentries under the
-  directory. A CInode can have multiple CDir when the directory is fragmented.
-
-These data structures are linked together as::
-
-  CInode
-  CDir
-   |   \
-   |      \
-   |         \
-  CDentry   CDentry
-  CInode    CInode
-  CDir      CDir
-   |         |  \
-   |         |     \
-   |         |        \
-  CDentry   CDentry  CDentry
-  CInode    CInode   CInode
-
-As this doc is being written, size of CInode is about 1400 bytes, size of CDentry
-is about 400 bytes, size of CDir is about 700 bytes. These data structures are
-quite large. Please be careful if you want to add new fields to them.
-