On Wed, Feb 23, 2011 at 03:35:11PM -0500, Chris Mason wrote:

quoted

    ocfs2 handles stable metadata for its checksums when feeding
things to the journal.  If we're doing pagecache-based I/O, is the
pagecache going to help here for data?

Data is much easier than metadata.  All you really need is to wait on
writeback in file_write, wait on writeback in page_mkwrite, and make
sure you don't free blocks back to the allocator that are actively under
IO.

I expect the hard part to be jbd and metadata in ext34.

	Yeah, catching use-without-access is not trivial.  I keep
thinking we've found them all, and then another bug crops up ;-)  At
least our checksums catch it.

Joel

-- 

"The doctrine of human equality reposes on this: that there is no
 man really clever who has not found that he is stupid."
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