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Date:   Mon, 6 Apr 2020 20:42:06 +0200
From:   Dominique Martinet <asmadeus@codewreck.org>
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     Matthew Wilcox <willy@infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        v9fs-developer@lists.sourceforge.net,
        Sergey Alirzaev <l29ah@cock.li>
Subject: Re: [GIT PULL] 9p update for 5.7
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Linus Torvalds wrote on Mon, Apr 06, 2020:
> I think the O_NONBLOCK difference is one of the more benign ones.
> 
> I just think it should be documented more.

Hadn't explicitely added you in Ccs, but I did post something to
document it:
http://lkml.kernel.org/r/1586193572-1375-1-git-send-email-asmadeus@codewreck.org

(small enough to just quote:)
--------------
diff --git a/Documentation/filesystems/9p.txt b/Documentation/filesystems/9p.txt
index fec7144e817c..3fb780ffdf23 100644
--- a/Documentation/filesystems/9p.txt
+++ b/Documentation/filesystems/9p.txt
@@ -133,6 +133,16 @@ OPTIONS
 		cache tags for existing cache sessions can be listed at
 		/sys/fs/9p/caches. (applies only to cache=fscache)
 
+BEHAVIOR
+========
+
+This section aims at describing 9p 'quirks' that can be different
+from a local filesystem behaviors.
+
+ - Setting O_NONBLOCK on a file will make client reads return as early
+   as the server returns some data instead of trying to fill the read
+   buffer with the requested amount of bytes or end of file is reached.
+
 RESOURCES
 =========

--------------

Will submit the pull request again with that in a couple of days unless
anything bad happens.

Thanks,
-- 
Dominique