Re: which dentry a page belongs to

[Shaya Potter <spotter@cs.columbia.edu>]

On Fri, 2004-04-23 at 18:37 +0100, Jamie Lokier wrote:

> You should be using the ->mmap operations of file_operations instead,
> and do your versioning operation at the time a writable shared mapping
> is created.  (The kernel does not provide a way to track when pages
> are actually modified through a specific mapping).  You can look in
> generic_file_mmap() to see the condition which tests for a writable
> shared mapping.  Test that, do the versioning operation, and then call
> generic_file_mmap from your own mmap function to finish the job.

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.

shaya