29.05.2016 03:56, Zygo Blaxell пишет: >> >> I don't think this can happen on btrfs: the superblock is updated only after >> a barrier when both the data and extent refs are already on the disk. > > If and only if the filesystem is mounted with the flushoncommit option, > that's true. This is not the default, though, and I lost a fair amount > of time and data before I discovered this. > According to wiki, this is default on "reasonably recent kernels"; unfortunately it does say what kernel is recent enough. I am surprised it can be disabled at all.
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