[Bug 585092] Re: giant IO delays on unmount

[Olivier Gagnon]

@Stephan Bader: from my research, the *two* bugs are related to the
cleaning of the dirty inodes. Umounting a ext4 filesystem with dirty
inodes will generate a lot of IO since the journal is mixed up. The same
dirty inodes problem exist when there is a lot of IO since jdb2 tries to
keep the journal up to date while there are errors. Umounting is just
the same process but done in a single operation for the whole
filesystem.

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giant IO delays on unmount
https://bugs.launchpad.net/bugs/585092
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