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-rw-r--r--doc/legacy/hacker-guide/posix.txt59
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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.
-
-