On Sat, Aug 25, 2012 at 09:39:58PM +0400, Cyrill Gorcunov wrote:
> On Sat, Aug 25, 2012 at 06:16:05PM +0100, Al Viro wrote:
> > On Thu, Aug 23, 2012 at 02:43:24PM +0400, Cyrill Gorcunov wrote:
> > > This patch prepares the ground for further extension of
> > > /proc/pid/fd[info] handling code by moving fdinfo handling
> > > code into fs/proc/fd.c.
> > >
> > > I think such move makes both fs/proc/base.c and fs/proc/fd.c
> > > easier to read.
> >
> > BTW, looking at the other stuff in fs/proc/base.c, why the hell is
> > struct file * grabbed in proc_map_files_readdir()? All we do with
> > it is passing it to proc_fill_cache(), which passes it to
> > proc_map_files_instantiate(), which looks at two sodding bits
> > in file->f_mode. Then we go and fput() all those struct file
> > references we'd been putting into the array... What for?
>
> Well, this could be simplified indeed, if I understand you correctly
> you propose just save f_mode in flexible array and use it instead
> of struct file, right? (which will require to rewrite code a bit)
Yes. FWIW, proc_fill_cache() is really atrocious ;-/ Not to mention
anything else, if we ever get a negative dentry there, we have a dentry
leak. I don't think it's possible in practice, but... Furthermore,
if (!child || IS_ERR(child) || !child->d_inode)
goto end_instantiate;
inode = child->d_inode;
if (inode) {
ino = inode->i_ino;
type = inode->i_mode >> 12;
}
dput(child);
looks really weird - how can we possibly get !inode when we'd just
checked that child->inode is non-NULL? Moreover, that find_inode_number()
a bit below is also as weird as it gets - in effect, we repeat
d_lookup() we'd just done earlier. How *can* it get us anything?
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