Re: [PATCH RFC] vfs: make fstatat retry on ESTALE errors from getattr call

From: Miklos Szeredi
Date: Tue Apr 17 2012 - 10:27:03 EST

Steve Dickson <SteveD@xxxxxxxxxx> writes:

> True, but even so... Giving file systems an opt-out option with the
> default being out, maybe still have some merit... Making file systems
> enable this new type of functionality would cut down on any of the
> "surprise" that might occur with this redo ;-)

I've been arguing for something slightly different for quite some time:
I never liked errno values which have side effects in the kernel yet
might be visible to userspace.

So why not introduce ERETRYSTALE, a *kernel internal* errno value that
userspace will never see and filesystems never accidentally set. The
VFS can turn this into ESTALE if it doesn't retry for some reason
(e.g. already retried).

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