From: Jamie Lokier <jamie@shareable.org>
To: Shaya Potter <spotter@cs.columbia.edu>
Cc: Christoph Hellwig <hch@infradead.org>, linux-fsdevel@vger.kernel.org
Subject: Re: which dentry a page belongs to
Date: Fri, 23 Apr 2004 22:37:47 +0100 [thread overview]
Message-ID: <20040423213747.GA8915@mail.shareable.org> (raw)
In-Reply-To: <1082743539.1943.84.camel@zaphod>
Shaya Potter wrote:
> right, I know i can do that (or on lookup(), or on open() ) but that
> basically limits me to a open/close transaction for versioning. Can't
> ioctl the fs, and cause all future writes to be in a new version.
"all future writes" is not very well defined with shared writable mappings.
Imagine this:
1. program write to a page, dirty bit is set in pte
[6 weeks later...]
2. you do the ioctl
3. your writepage gets called
Now you will store an update for a change which happened 6 weeks
before you called the ioctl(). Is that what you really wanted?
Perhaps it is.
-- Jamie
next prev parent reply other threads:[~2004-04-23 21:37 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
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 [this message]
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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