On Wed, Feb 13, 2013 at 2:47 PM, Theodore Ts'o <tytso@xxxxxxx> wrote:
On Wed, Feb 13, 2013 at 05:41:41PM -0500, J. Bruce Fields wrote:Doing this as an ioctl which gets called right after opendir, i.e
> > 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.
(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.
That would work, even though it would be ext3/4 specific. What is the recommended programmatic way to detect if the file is on ext3/4 -- we would not want to attempt that blindly on a non-ext3/4 FS as the numerical value of EXT4_IOC_DEGRADED_READDIR might get interpreted in dangerous ways?
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