Re: For review: open_by_name_at(2) man page

[Christoph Hellwig]

On Tue, Mar 18, 2014 at 09:00:07AM +1100, NeilBrown wrote:
> ESTALE is also returned if the filesystem does not support file-handle ->
> file mappings.
> On filesystems which don't provide export_operations (/sys /proc ubifs
> romfs cramfs nfs coda ... several others) name_to_handle_at will produce a
> generic handle using the 32 bit inode and 32 bit i_generation.

Do we?  Seems like the code is erroring out early if there are no
export_ops?

> Does it?  My understanding from "man libblkid" (it is a while since I've read
> the code) is that it either uses info in /dev/disks/by-* or reads directly
> from the block devices (maybe using /sys to find them?) and interprets the
> superblock to extract a UUID.

It normally reads directly from disk, unless it has changed very
recently.

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