> On Sep 15, 2019, at 11:03 AM, Christos Zoulas <chris...@zoulas.com> wrote:
>
> I think it is quite reliable because all the file descriptors would be
> recently
> opened and therefore be in the cache. One would need to DoS the cache
> cause eviction. If that turns out to be false, we can make the namecache
> reliable, or withdraw it.
If we had a way to ask the file system for the / a name+parent in the event we
don't find an entry in the name cache, then we don't have to make the name
cache "reliable".
FWIW, I don't think making the name cache "reliable" is necessarily a good idea
-- it could be abused to consume kernel memory by creating lots of long-named
files / directories.
In the event that the name really can't be determined (perhaps it's an
open-unlinked file?), then I think it's perfectly reasonable to return ENOENT
for F_GETPATH; callers need to be capable of handling that.
-- thorpej
