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----------------
-* storage/posix
----------------
-
-- SET_FS_ID
-
-  This is so that all filesystem checks are done with the user's 
-  uid/gid and not GlusterFS's uid/gid.
-
-- MAKE_REAL_PATH
- 
-  This macro concatenates the base directory of the posix volume
-  ('option directory') with the given path.
-
-- need_xattr in lookup
-
-  If this flag is passed, lookup returns a xattr dictionary that contains
-  the file's create time, the file's contents, and the version number
-  of the file.
-
-  This is a hack to increase small file performance. If an application 
-  wants to read a small file, it can finish its job with just a lookup 
-  call instead of a lookup followed by read.
-
-- getdents/setdents
-
-  These are used by unify to set and get directory entries.
-
-- ALIGN_BUF
-  
-  Macro to align an address to a page boundary (4K).
-
-- priv->export_statfs
-
-  In some cases, two exported volumes may reside on the same
-  partition on the server. Sending statvfs info for both
-  the volumes will lead to erroneous df output at the client,
-  since free space on the partition will be counted twice.
-
-  In such cases, user can disable exporting statvfs info
-  on one of the volumes by setting this option.
-
-- xattrop
-
-  This fop is used by replicate to set version numbers on files. 
-
-- getxattr/setxattr hack to read/write files
-
-  A key, GLUSTERFS_FILE_CONTENT_STRING, is handled in a special way by
-  getxattr/setxattr. A getxattr with the key will return the entire
-  content of the file as the value. A setxattr with the key will write
-  the value as the entire content of the file.
-
-- posix_checksum
-  
-  This calculates a simple XOR checksum on all entry names in a
-  directory that is used by unify to compare directory contents.
-
-