ext3 data=journal?

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Hi,

ext3 has a filesystem option, 'data=journal', described in
Documentation/filesystems/ext3.txt as 'All data are committed into the
journal prior to being written into the main file system.'

On LWN (in comments) and on a few other sites, I see people say that
this option is 'broken'.

What ordering constraints does it enforce beyond data=ordered? What do
the commenters mean when they say it is 'broken'?

Thanks,
-- vs

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