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SubjectRe: [PATCH 2/3] Fix fsync livelock
On Sun, Oct 05, 2008 at 08:01:46PM -0400, Mikulas Patocka wrote:
> This looks madly complicated. And ineffective, because if some page was
> submitted before fsync() was invoked, and is under writeback while fsync()
> is called, fsync() still has to wait on it.

fsync() waiting on pre-issued writeback pages is the correct

IOW, if the page is under writeback at the time an fsync() is
issued (e.g. issued by pdflush), the page was *not clean* at the
time the fsync() was called and hence must be clean when fsync()
returns. fsync() needs to wait for all pages under I/O at the time
it is called, not just the dirty pages it issues I/O on.....


Dave Chinner

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