Re: ftruncate-mmap: pages are lost after writing to mmaped file.

[Chris Mason]

On Tue, 2009-03-24 at 14:26 +0100, Jan Kara wrote:
> On Tue 24-03-09 13:55:10, Jan Kara wrote:

> >   And one more interesting thing I don't yet fully understand - I see pages
> > having PageError() set when they are removed from page cache (and they have
> > been faulted in before). It's probably some interaction with pagecache
> > readahead...
>   Argh... So the problem seems to be that get_block() occasionally returns
> ENOSPC and we then discard the dirty data (hmm, we could give at least a
> warning for that). I'm not yet sure why getblock behaves like this because
> the filesystem seems to have enough space but anyway this seems to be some
> strange fs trouble as well.
> 

Ouch.  Perhaps the free space is waiting on a journal commit?

-chris


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