linux-kernel - Re: efivarfs and writev() support

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Message-Id: <7F5112DD-6998-47D3-B6B9-5618E14E022A@holtmann.org>
Date:	Wed, 11 Mar 2015 08:12:52 -0700
From:	Marcel Holtmann <marcel@...tmann.org>
To:	Matt Fleming <matt@...eblueprint.co.uk>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-efi@...r.kernel.org,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Jeremy Kerr <jk@...abs.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Al Viro <viro@...IV.linux.org.uk>
Subject: Re: efivarfs and writev() support

Hi Matt,

>> it seems that efivarfs only supports readv(), but when it comes to
>> writev(), I am getting an error. Is there any reason to not support
>> vectored write on this filesystem? Especially with the uint32 header
>> for each file, I think it would make perfect sense to support it.
> 
> What error are you seeing? I thought that the vfs fell back to a looped
> write if the file system doesn't support .write_iter()?

that seems to work for readv(), but not for writev().

> But yes, we definitely should support writev().

I just get an EIO error and have not traced this down any further.

Regards

Marcel

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