New ext4 features

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'''Multiblock Allocation'''
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=== Multiblock Allocation ===
  
 
* Primary developer: Alex Tomas
 
* Primary developer: Alex Tomas
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* outstanding issues: None
 
* outstanding issues: None
  
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'''Delayed Allocation'''
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=== Delayed Allocation ===
  
 
* Primary developer: Alex Tomas
 
* Primary developer: Alex Tomas
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* outstanding issues: lack of plan for 1k,2k block size and default data=order mode, and Andrew asked for more comments.
 
* outstanding issues: lack of plan for 1k,2k block size and default data=order mode, and Andrew asked for more comments.
  
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'''Break 32000 subdirectory limit'''
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=== Break 32000 subdirectory limit ===
  
 
* Primary developer: Andreas
 
* Primary developer: Andreas
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* outstanding issues: None
 
* outstanding issues: None
  
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'''directory Inodes reservation'''
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=== directory Inodes reservation ===
  
 
* Primary developer: Coly
 
* Primary developer: Coly
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* outstanding issues:  
 
* outstanding issues:  
  
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'''nsec timestamps'''
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=== nsec timestamps ===
  
 
* Primary developer: Andreas
 
* Primary developer: Andreas
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* outstanding issues:
 
* outstanding issues:
  
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'''inode version on disk'''
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=== inode version on disk ===
  
 
* Primary developer: Jean-Noel Cordenner, Kalpak Shah
 
* Primary developer: Jean-Noel Cordenner, Kalpak Shah
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* outstanding issues: None
 
* outstanding issues: None
  
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'''uninitialized groups'''
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=== uninitialized groups ===
  
 
* Primary developer: Andreas Dilger
 
* Primary developer: Andreas Dilger
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* outstanding issues: lazy zeroing of unused inode table blocks after filesystem is first mounted
 
* outstanding issues: lazy zeroing of unused inode table blocks after filesystem is first mounted
  
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'''journal checksumming'''
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=== journal checksumming ===
  
 
* Primary developer: Andreas
 
* Primary developer: Andreas
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* outstanding issues:
 
* outstanding issues:
  
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'''persistent preallocation'''
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=== persistent preallocation ===
  
 
* Primary developer: Amit Arora, Suparna
 
* Primary developer: Amit Arora, Suparna
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* outstanding issues: Need consensus on what interface should be used (ioctl, fcntl..), should return value be zero or number of block allocated on success
 
* outstanding issues: Need consensus on what interface should be used (ioctl, fcntl..), should return value be zero or number of block allocated on success
  
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'''Online Defragmentation'''
+
=== Online Defragmentation ===
  
 
* Primary developer: Takashi Sato
 
* Primary developer: Takashi Sato
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* outstanding issues:  
 
* outstanding issues:  
 
    
 
    
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'''Undelete Feature for Ext4'''
+
=== Undelete Feature for Ext4 ===
  
 
* Primary Developer:  
 
* Primary Developer:  
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* outstanding issues: Should the kernel be involved with undelete
 
* outstanding issues: Should the kernel be involved with undelete
  
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'''Large file support'''
+
=== Large file support ===
  
 
* Primary Developer: Takashi Sato
 
* Primary Developer: Takashi Sato

Revision as of 00:05, 20 November 2007

Contents

Multiblock Allocation

  • Primary developer: Alex Tomas
  • Status: Patches available - ready to push to mainline
  • Changes on-disk format: No
  • Target Date: ?
  • e2fsprogs changes: No
  • outstanding issues: None

Delayed Allocation

  • Primary developer: Alex Tomas
  • Status: Patches available
  • Changes on-disk format: No
  • Target Date: (in patch queue)
  • e2fsprogs changes: No
  • outstanding issues: lack of plan for 1k,2k block size and default data=order mode, and Andrew asked for more comments.

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: Patches available and reviewed
  • Change on-disk format: Yes
  • Target Date: Once interface issue is resolved
  • e2fsprogs changes: complete
  • outstanding issues: Need consensus on what interface should be used (ioctl, fcntl..), should return value be zero or number of block allocated on success

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: Increase 2Tb limit on filesize. Takashi has begun working on this.
  • Change on-disk format:
  • Target Date:
  • e2fsprogs Changes: Needed
  • outstanding issues: unknown
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