New ext4 features

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{{WARN| This page is outdated. For details about the Ext4 features, you can [http://kernelnewbies.org/Ext4 read this article]}}
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== Introduction ==
  
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This page contains information about new ext4 features which are currently under development.
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For a description of Ext4 features as they appeared in the original 2.6.28 kernel when ext4 was first released, please see the [http://kernelnewbies.org/Ext4 Ext4 Kernelnewbies article].
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== Currently being worked on ==
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=== First Class Quota Support ===
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* Primary developer: Aditya Kali
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* Status: In progress
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* Design document: [[Design For 1st Class Quota in Ext4]]
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* e2fsprogs changes: Yes
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* Oustanding issues: None
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=== Big Allocation Blocks ===
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* Primary developer: Theodore Ts'o
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* Status: In progress
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* Design document: [[Design for Big Allocation Blocks]]
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* e2fsprogs changes: Yes, needed
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* Oustanding issues: None
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== Done ==
  
 
=== Multiblock Allocation ===
 
=== Multiblock Allocation ===
  
 
* Primary developer: Alex Tomas
 
* Primary developer: Alex Tomas
* Status: Patches available - ready to push to mainline
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* Status: Done
 
* Changes on-disk format: No
 
* Changes on-disk format: No
 
* Target Date: ?
 
* Target Date: ?
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* Primary developer: Alex Tomas
 
* Primary developer: Alex Tomas
* Status: Patches in unstable patch series
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* Status: Done
 
* Changes on-disk format: No
 
* Changes on-disk format: No
 
* Target Date: (in patch queue)
 
* Target Date: (in patch queue)
 
* e2fsprogs changes: No
 
* e2fsprogs changes: No
* outstanding issues: handling 1k,2k block size and default data=order mode, ENOSPC handling
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* outstanding issues: Done
  
 
=== Break 32000 subdirectory limit ===
 
=== Break 32000 subdirectory limit ===

Revision as of 20:13, 22 February 2011

Contents

Introduction

This page contains information about new ext4 features which are currently under development.

For a description of Ext4 features as they appeared in the original 2.6.28 kernel when ext4 was first released, please see the Ext4 Kernelnewbies article.

Currently being worked on

First Class Quota Support

Big Allocation Blocks

Done

Multiblock Allocation

  • Primary developer: Alex Tomas
  • Status: Done
  • Changes on-disk format: No
  • Target Date: ?
  • e2fsprogs changes: No
  • outstanding issues: None

Delayed Allocation

  • Primary developer: Alex Tomas
  • Status: Done
  • Changes on-disk format: No
  • Target Date: (in patch queue)
  • e2fsprogs changes: No
  • outstanding issues: Done

Break 32000 subdirectory limit

  • Primary developer: Andreas
  • Status: Done
  • Changes on-disk format: Yes
  • Target Date: (in patch queue)
  • e2fsprogs changes: done
  • outstanding issues: None

directory Inodes reservation

  • Primary developer: Coly
  • Status: Patch available
  • Changes on-disk format: No
  • Target Date: Nov, 2007
  • e2fsprogs changes: Needed
  • outstanding issues:

nsec timestamps

  • Primary developer: Andreas
  • Status: Done
  • Change on-disk format: Yes
  • Target Date: (in patch queue)
  • e2fsprogs changes: Done
  • outstanding issues:

inode version on disk

  • Primary developer: Jean-Noel Cordenner, Kalpak Shah
  • Status: Done
  • Change on-disk format: Yes
  • Target Date: (in patch queue)
  • e2fsprogs changes: None
  • outstanding issues: None

uninitialized groups

  • Primary developer: Andreas Dilger
  • Status: Done
  • Change on-disk format: Yes
  • Target Date: (in patch queue)
  • e2fsprogs changes: Done
  • outstanding issues: lazy zeroing of unused inode table blocks after filesystem is first mounted

journal checksumming

  • Primary developer: Andreas
  • Status: Prototype available
  • Change on-disk format: Yes
  • Target Date: (in patch queue)
  • e2fsprogs changes: Needed
  • outstanding issues:

persistent preallocation

  • Primary developer: Amit Arora, Suparna
  • Status: Done
  • Change on-disk format: Yes
  • Target Date: (in patch queue)
  • e2fsprogs changes: complete
  • outstanding issues:

Online Defragmentation

  • Primary developer: Takashi Sato
  • Status:
 latest patch: v0.2 posted on Jan 10th.
 Previous tries:
 http://marc.theaimsgroup.com/?l=linux-ext4&m=116678507906760&w=2
 http://marc.theaimsgroup.com/?l=linux-ext4&m=116307062907075&w=2
  • Related discussions
 ext3 online defrag:
 http://marc.theaimsgroup.com/?l=linux-fsdevel&m=116160640814410&w=2
  • Dependencies: Multiple block allocation from Alex Thomas
  • Change on-disk format: No
  • Target Date:
  • e2fsprogs changes: No
  • outstanding issues:

Undelete Feature for Ext4

  • Primary Developer:
  • status: Idea was proposed on the mailing list, still need more thought on the feature.
  • Change on-disk format:
  • Target Date:
  • e2fsprogs changes:
  • outstanding issues: Should the kernel be involved with undelete

Large file support

  • Primary Developer: Takashi Sato
  • status: Done
  • Change on-disk format:
  • Target Date: (in patch queue)
  • e2fsprogs Changes: Done
  • outstanding issues:
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