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Ext4 Developer Interlock Call: 09-17-07 Minutes

Attendees: Mingming Cao, Andreas Dilger, Eric Sandeen, Dave Kleikamp, Ted Ts'o, Avantika Mathur, Valerie Clement, Jean-Noel Cordenner, Jean-Pierre Dion

Minutes can be accessed at: http://ext4.wiki.kernel.org/index.php/Ext4_Developer%27s_Conference_Call

Reviewed patches in the patch queue, identifying those that are ready to be merged with 2.6.24-rc1

  • Journal_Checksum: Not yet ready for mainline, Avantika and Girish are looking into kernel oops on fsstress.
  • Uninitialized Block Groups: Ready to be pushed upstream, Avantika will post this patch to lkml
  • Large Block Support: Mingming tested these patches on various architectures. There should be new testcases added to e2fsprogs to test large block sizes. Andreas also described a possible error case with empty directories. Otherwise the feature is ready to be pushed to lkml
  • JBD Cleanups: Ready to be pushed upstream
  • Flex_BG Patches: should be pushed upstream asap. The required flag in e2fsprogs is already reserved for this feature.
  • Delalloc: Patch should be sent to lkml for detailed review, since not only ext4 code is being touched. Delalloc will be pushed with the other patches that are being pushed upstream now.
    • Shaggy will look into whether the delalloc framework can be used for JFS
    • We will also try porting the patch to ext3, with a search/replace, and try testing on ext3.
  • Mballoc: Not ready for 2.6.23. We will wait for the next release, as it hasn't been in the patch queue for very long. The main issue is to break the patch into smaller pieces making it easier to understand. This is tricky to break such a large patch into smaller patches.
  • Mingming will re-order the patch queue, putting the patches that are ready to be pushed upstream at the top.


  • Ted sent out his initial extents support patches to the mailing list; he is continuing on ToDo items which includes a lot of error checking, and waiting for feedback on the patches. In his patches, any knowledge of the on-disk format of the filesystem is isolated to a small part of the library, making it easier to change format in the future.
  • 64-bit support in e2fsprogs is background priority, while adding support for other ext4 features (e.g. unintialized block groups) is higher priority right now. Some of Valerie's pre-work/cleanup patches are ready to be merged now.
  • Avantika and Aneesh are working on automated testing of e2fsprogs.
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