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Feature
-------
Implement support for FALLOCATE file operation on EC volumes.
Summary
-------
Adding support for FALLOCATE file operation on EC volumes. With this
support users can now perform FALLOCATE opration and any dependant
oprations on EC volume that needs FALLOCATE support.
Owners
------
Sunil Kumar Acharya <sheggodu@redhat.com>
Current status
--------------
Completed.
Related Feature Requests and Bugs
---------------------------------
https://github.com/gluster/glusterfs/issues/219
https://bugzilla.redhat.com/show_bug.cgi?id=1448293
Detailed Description
--------------------
FALLOCATE operations are used to preallocate or deallocate space to a file.
Existing EC volume doesn't have support for FALLOCATE operation. Due to this,
users cannot perform certain operations on EC volumes (ex: rebalance).
This feature addion will enable users to use EC volumes in a seamless fashion
by extending support for more operations.
With this feature addition we are supporting the basic FALLOCATE functionality.
This enhancement will not add support for following FALLOCATE modes/flags.
FALLOC_FL_COLLAPSE_RANGE,
FALLOC_FL_INSERT_RANGE,
FALLOC_FL_ZERO_RANGE,
FALLOC_FL_PUNCH_HOLE
Benefit to GlusterFS
--------------------
With this feature implementation Gluster users can perform rebalance operation
on EC volumes.
Scope
-----
#### Nature of proposed change
Add support for file operation on EC by modifying existing code.
#### Implications on manageability
NA
#### Implications on presentation layer
NA
#### Implications on persistence layer
NA
#### Implications on 'GlusterFS' backend
NA
#### Modification to GlusterFS metadata
NA
#### Implications on 'glusterd'
NA
How To Test
-----------
Regression test scripts have been added to perform the testing.
User Experience
---------------
User can now perform FALLOCATE oprations on EC volumes.
Dependencies
------------
NA
Documentation
-------------
Required.
Status
------
Completed.
Comments and Discussion
-----------------------
NA
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