From: Christoph Hellwig <hch@infradead.org>
To: Shaya Potter <spotter@cs.columbia.edu>
Cc: Jamie Lokier <jamie@shareable.org>, linux-fsdevel@vger.kernel.org
Subject: Re: which dentry a page belongs to
Date: Fri, 23 Apr 2004 18:22:16 +0100 [thread overview]
Message-ID: <20040423182216.A4514@infradead.org> (raw)
In-Reply-To: <1082740707.1943.61.camel@zaphod>; from spotter@cs.columbia.edu on Fri, Apr 23, 2004 at 01:18:27PM -0400
On Fri, Apr 23, 2004 at 01:18:27PM -0400, Shaya Potter wrote:
> > you can be in writepage with page->mapping->i_mmap{,shared} beeing empty.
> > No way in hell you'll ever get to a dentry.
>
> the question being in what cases will that happen, so I can make a
> determination if I care about those cases. (i.e. if the dentry is
> deleted, I don't particularly care, as since I am versioning, if it's
> already been deleted, don't care)
>
> i.e. how can I determine where i_mmap{,shared} exist and when does't it?
> (in file system page context).
if there's no mapping anymore at the point of the writeback. e.g. when
an munmap happened before the writeback is scheduled. And you can't
determine it except by checking whether it's empty.
p.s. wondering what strange homework assignments they give these days..
next prev parent reply other threads:[~2004-04-23 17:22 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-23 14:57 which dentry a page belongs to Shaya Potter
2004-04-23 15:14 ` Jamie Lokier
2004-04-23 15:42 ` Shaya Potter
2004-04-23 16:37 ` Christoph Hellwig
2004-04-23 16:52 ` Shaya Potter
2004-04-23 17:01 ` Christoph Hellwig
2004-04-23 17:18 ` Shaya Potter
2004-04-23 17:22 ` Christoph Hellwig [this message]
2004-04-23 17:32 ` Shaya Potter
2004-04-23 17:37 ` Jamie Lokier
2004-04-23 17:59 ` Shaya Potter
2004-04-23 22:13 ` Jamie Lokier
2004-04-23 18:05 ` Shaya Potter
2004-04-23 21:37 ` Jamie Lokier
2004-04-23 22:26 ` Shaya Potter
2004-04-23 22:49 ` Jamie Lokier
2004-04-25 5:23 ` Shaya Potter
2004-04-25 23:22 ` Erez Zadok
2004-04-24 8:53 ` Jan Hudec
2004-04-24 8:44 ` Jan Hudec
2004-04-24 9:20 ` Christoph Hellwig
2004-04-24 9:32 ` Jan Hudec
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