Re: [PATCH 3/3] Add a pair of system calls to make extended file stats available

From: David Howells
Date: Tue Jun 29 2010 - 19:30:17 EST

Joel Becker <Joel.Becker@xxxxxxxxxx> wrote:

> The less variable length stuff the better, I think. At least,
> for the stuff stat(2) already returns, you should have a fixed-size
> structure. Even if I only pass the GIVE_ME_UIDS flag, I don't want to
> have to deal with the variable size stuff until I've actually asked for
> esoteric things. I'll know that the non-UIDS fields are garbage by the
> fact that I didn't ask for them.

I was thinking of the fixed length xstat struct plus appendable extensions to
be defined later.

I could live with each defined extension being of a fixed length, so for
example, you set bit 20, and it adds, say, a 16-byte volume ID in the
appropriate order, padded out appropriately for the filesystem.

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