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-#Gfid-access Translator
-The 'gfid-access' translator provides access to data in glusterfs using a
-virtual path. This particular translator is designed to provide direct access to
-files in glusterfs using its gfid. 'GFID' is glusterfs's inode number for a file
-to identify it uniquely. As of now, Geo-replication is the only consumer of this
-translator. The changelog translator logs the 'gfid' with corresponding file
-operation in journals which are consumed by Geo-Replication to replicate the
-files using gfid-access translator very efficiently.
-
-###Implications and Usage
-A new virtual directory called '.gfid' is exposed in the aux-gfid mount
-point when gluster volume is mounted with 'aux-gfid-mount' option.
-All the gfids of files are exposed in one level under the '.gfid' directory.
-No matter at what level the file resides, it is accessed using its
-gfid under this virutal directory as shown in example below. All access
-protocols work seemlessly, as the complexities are handled internally.
-
-###Testing
-1. Mount glusterfs client with '-o aux-gfid-mount' as follows.
-
- mount -t glusterfs -o aux-gfid-mount <node-ip>:<volname> <mountpoint>
-
- Example:
-
- #mount -t glusterfs -o aux-gfid-mount rhs1:master /master-aux-mnt
-
-2. Get the 'gfid' of a file using normal mount or aux-gfid-mount and do some
- operations as follows.
-
- getfattr -n glusterfs.gfid.string <file>
-
- Example:
-
- #getfattr -n glusterfs.gfid.string /master-aux-mnt/file
- # file: file
- glusterfs.gfid.string="796d3170-0910-4853-9ff3-3ee6b1132080"
-
- #cat /master-aux-mnt/file
- sample data
-
- #stat /master-aux-mnt/file
- File: `file'
- Size: 12 Blocks: 1 IO Block: 131072 regular file
- Device: 13h/19d Inode: 11525625031905452160 Links: 1
- Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
- Access: 2014-05-23 20:43:33.239999863 +0530
- Modify: 2014-05-23 17:36:48.224999989 +0530
- Change: 2014-05-23 20:44:10.081999938 +0530
-
-
-3. Access files using virtual path as follows.
-
- /mountpoint/.gfid/<actual-canonical-gfid-of-the-file\>'
-
- Example:
-
- #cat /master-aux-mnt/.gfid/796d3170-0910-4853-9ff3-3ee6b1132080
- sample data
- #stat /master-aux-mnt/.gfid/796d3170-0910-4853-9ff3-3ee6b1132080
- File: `.gfid/796d3170-0910-4853-9ff3-3ee6b1132080'
- Size: 12 Blocks: 1 IO Block: 131072 regular file
- Device: 13h/19d Inode: 11525625031905452160 Links: 1
- Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
- Access: 2014-05-23 20:43:33.239999863 +0530
- Modify: 2014-05-23 17:36:48.224999989 +0530
- Change: 2014-05-23 20:44:10.081999938 +0530
-
- We can notice that 'cat' command on the 'file' using path and using virtual
- path displays the same data. Similarly 'stat' command on the 'file' and using
- virtual path with gfid gives same Inode Number confirming that its same file.
-
-###Nature of changes
-This feature is introduced with 'gfid-access' translator.