| From: |
| Theodore Ts'o <tytso-3s7WtUTddSA-AT-public.gmane.org> |
| To: |
| "J. Bruce Fields" <bfields-uC3wQj2KruNg9hUCZPvPmw-AT-public.gmane.org> |
| Subject: |
| Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies |
| Date: |
| Wed, 13 Feb 2013 17:47:20 -0500 |
| Message-ID: |
| <20130213224720.GE5938@thunk.org> |
| Cc: |
| Anand Avati <anand.avati-Re5JQEeQqe8AvxtiuMwx3w-AT-public.gmane.org>,
Bernd Schubert <bernd.schubert-mPn0NPGs4xGatNDF+KUbs4QuADTiUCJX-AT-public.gmane.org>,
sandeen-H+wXaHxf7aLQT0dZR+AlfA-AT-public.gmane.org, linux-nfs-u79uwXL29TY76Z2rM5mHXA-AT-public.gmane.org,
linux-ext4-u79uwXL29TY76Z2rM5mHXA-AT-public.gmane.org, gluster-devel-qX2TKyscuCcdnm+yROfE0A-AT-public.gmane.org |
| Archive-link: |
| Article, Thread
|
On Wed, Feb 13, 2013 at 05:41:41PM -0500, J. Bruce Fields wrote:
> > What if we have an ioctl or a process personality flag where a broken
> > application can tell the file system "I'm broken, please give me a
> > degraded telldir/seekdir cookie"? That way we don't penalize programs
> > that are doing the right thing, while providing some accomodation for
> > programs who are abusing the telldir cookie.
>
> Yeah, if there's a simple way to do that, maybe it would be worth it.
Doing this as an ioctl which gets called right after opendir, i.e
(ignoring error checking):
DIR *dir = opendir("/foo/bar/baz");
ioctl(dirfd(dir), EXT4_IOC_DEGRADED_READDIR, 1);
...
should be quite easy. It would be a very ext3/4 specific thing,
though.
It would be more work to get something in as a process personality
flag, mostly due to the politics of assiging a bit out of the
bitfield.
- Ted
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