On Mon, 11 Oct 2010 14:14:36 -0500 Steve French <[email protected]> wrote:
> On Mon, Oct 11, 2010 at 2:07 PM, Jeff Layton <[email protected]> wrote: > > Eliminate the poor, misunderstood "oflags" option from cifs_new_fileinfo. > > The callers mostly pass in the filp->f_flags here. > > > > That's not correct however since we're checking that value for > > the presence of FMODE_READ. Luckily that only affects how the f_list is > > ordered. What it really wants here is the file->f_mode, but this check > > really makes no sense whatsoever. FMODE_READ will be set for O_RDWR or > > O_RDONLY opens. So this in effect just moves those to the front of the > > list and leaves O_WRONLY at the end. > > > > That might make some sense if more things paid attention to the list > > order, but the only thing that does is find_readable_file, which uses > > it to stop scanning the list when it hits a write-only one. > > Removing a small optimization for small simplification of code seems > less useful type of patch. Not sure how often the acl calls get hit > - but it is remotely possible that this could affect performance. > Emphasis on _remotely_ :) They don't get hit at all unless you're mounting with -o cifsacl. If you're doing that, performance is already going to suck and this won't make the least bit of difference. It's really hard to see how this would have any measurable performance impact. I think we'll all be better off with clear, defensive code for this sort of stuff rather than questionable optimizations. -- Jeff Layton <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
