Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mappedfiles

[Linus Torvalds]

On Fri, 18 Jan 2008, Miklos Szeredi wrote:
> 
> That would need a new page flag (PG_mmap_dirty?).  Do we have one
> available?

Yeah, that would be bad. We probably have flags free, but those page flags 
are always a pain. Scratch that.

How about just setting a per-vma dirty flag, and then instead of updating 
the mtime when taking the dirty-page fault, we just set that flag?

Then, on unmap and msync, we just do

	if (vma->dirty-flag) {
		vma->dirty_flag = 0;
		update_file_times(vma->vm_file);
	}

and be done with it? 
		

			Linus
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