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Old 9th December 2009
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Default Journaling softupdates, SU+J

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I suspect that most people who read this blog are familiar with journaling as a mechanism for ensuring post-crash filesystem consistency. Some of you may also be familiar with copy-on-write and log structured filesystems as an alternative to journaling. BSD's ffs, an extension of the original unix filesystem, has used an alternate approach called soft-updates to handle filesystem consistency for around 10 years. For the past few months, I have been creating a hybrid journaled softupdate system to deal with inadequacies in the existing softdep system. This work is opensource and will be available to FreeBSD-current users sometime this month. Behind the cut I briefly describe the tradeoffs in each consistency mechanism and motivation for this work.
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Old 10th December 2009
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Kirk McKusick, original author of the FreeBSD implementation of soft-updates, is working with this guy. Seems to be a very interesting idea!
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Old 10th December 2009
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Intriguing, and maybe this will finally put a few stupid people in their place while it's going, hehehehe.
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Old 10th December 2009
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Originally Posted by hansivers View Post
Kirk McKusick, original author of the FreeBSD implementation of soft-updates, is working with this guy. Seems to be a very interesting idea!
This guy, Jeff Roberson (aka jeffr), is also responsible for SCHED_ULE and the further development of it sponsored by Nokia.
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Old 10th December 2009
J65nko J65nko is offline
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Originally Posted by hansivers View Post
Kirk McKusick, original author of the FreeBSD implementation of soft-updates, is working with this guy. Seems to be a very interesting idea!
You don't give McKusick enough credit, he is one of the fathers of the UFS filesystem. See http://en.wikipedia.org/wiki/Marshall_Kirk_McKusick
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Old 12th December 2009
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Originally Posted by Oliver_H View Post
This guy, Jeff Roberson (aka jeffr), is also responsible for SCHED_ULE and the further development of it sponsored by Nokia.
Wow! I was not aware of that.. Thanks for this information!

About Dr McKusick, I've read most of its papers about UFS and SU. Great person with a good sense of humor (see its video of the history of the BSD Unix).
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