linux-kernel - Re: [GIT PULL] 9p update for 5.7

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Message-ID: <20200406165506.GA26216@nautica>
Date:   Mon, 6 Apr 2020 18:55:06 +0200
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        v9fs-developer@...ts.sourceforge.net,
        Sergey Alirzaev <l29ah@...k.li>
Subject: Re: [GIT PULL] 9p update for 5.7

Matthew Wilcox wrote on Mon, Apr 06, 2020:
> POSIX may well "allow" short reads, but userspace programmers basically
> never check the return value from read().  Short reads aren't actually
> allowed.  That's why signals are only allowed to interrupt syscalls if
> they're fatal (and the application will never see the returned value
> because it's already dead).

I've seen tons of programs not check read return value yes but these
also have no idea what O_NONBLOCK is so I'm not sure how realistic a
use-case that is?

The alternative I see would be making pipes go through the server as I
said, but that would probably mean another mount option for this; pipes
work as local pipes like they do in nfs currently.

-- 
Dominique