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ext4 and data lossext4 and data lossPosted Mar 12, 2009 11:48 UTC (Thu) by epa (subscriber, #39769)In reply to: ext4 and data loss by quotemstr Parent article: ext4 and data loss
POSIX is a set of bare minimum requirements, not a bible for a usable system. It's perfectly legitimate to give guarantees beyond the ones POSIX dictates. A working atomic rename -- file data and all --- is one such constraint that adds to the usefulness and reliability of the system as a whole.That's all very well, but such a guarantee has never in fact been made. (If you can find something in the ext3 documentation that makes such a promise, I will eat my words.)
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ext4 and data loss Posted Mar 12, 2009 14:43 UTC (Thu) by quotemstr (subscriber, #45331) [Link] Well first, that's the way it's worked in practice for years, documentation be damned. Second, these semantics are implied by the description of data=ordered.
ext4 and data loss Posted Mar 12, 2009 15:01 UTC (Thu) by epa (subscriber, #39769) [Link] Second, these semantics are implied by the description of data=ordered.You could be right: I always thought of data=ordered as promising 'no garbage blocks in files that were enlarged just before a crash' but it could be taken as promising more.
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