Re: [PATCH 11/11] ext4: add cross rename support

From: Miklos Szeredi
Date: Sat Jan 18 2014 - 01:50:03 EST

On Fri, Jan 17, 2014 at 11:08 PM, J. Bruce Fields <bfields@xxxxxxxxxxxx> wrote:
> On Fri, Jan 17, 2014 at 11:53:07PM +1300, Michael Kerrisk (man-pages) wrote:
>> > The following additional errors are defined for renameat2():
>> >
>> > The filesystem does not support a flag in flags
>> This is not the usual error for an invalid bit flag. Please make it EINVAL.
> I agree that EINVAL makes sense for an invalid bit flag.
> But renameat2() can also fail when the caller passes a perfectly valid
> flags field but the paths resolve to a filesystem that doesn't support
> the RENAME_EXCHANGE operation. EOPNOTSUPP looks more appropriate in
> that case.

OTOH, from the app's perspective, it makes little difference whether a
particular kernel doesn't support the reanameat2 syscall, or it
doesn't support RENAME_FOO flag or if it does support RENAME_FOO but
not in all filesystems. In all those cases it has to just fall back
to something supported and it doesn't matter *why* it wasn't

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