btrfs: Mount with flushoncommit
flag
Not an expert on this, but my understanding is that without this flag, outages will result in a state that despite being consistent, most applications are not mature enough to handle. Namely, we ran benchmarks that reproduced appearance of zero-length files upon sudden poweroffs. Databases should be fine since they know well about the guarantees the filesystem must provide, but not applications are databases. So let's play safe about this. See: - https://thunk.org/tytso/blog/2009/03/12/delayed-allocation-and-the-zero-length-file-problem/ - https://github.com/Zygo/bees/issues/68#issuecomment-403262059
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@ -40,7 +40,13 @@ def be_mounted(dev, mountpoint):
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# noinspection PyUnreachableCode
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be_unmounted(mountpoint)
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run(f"mount {dev} {mountpoint}")
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fs = current_fs(dev)
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if fs == "ext4":
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run(f"mount {dev} {mountpoint}")
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elif fs == "btrfs":
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run(f"mount -o flushoncommit {dev} {mountpoint}")
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else:
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raise Exception(f"Unsupported fs type: {fs}")
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def be_unmounted(path):
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