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Date: Sun, 5 Jun 2011 23:39:49 -0400
From: "Ted Ts'o" <tytso@mit.edu>
To: Michael Tokarev <mjt@tls.msk.ru>
Cc: Linux-kernel <linux-kernel@vger.kernel.org>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: unlink(nonexistent): EROFS or ENOENT?
Message-ID: <20110606033949.GE7180@thunk.org>
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	Michael Tokarev <mjt@tls.msk.ru>,
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On Sun, May 29, 2011 at 08:08:55PM +0400, Michael Tokarev wrote:
> Hello.
> 
> Just noticed that at least on ext4, unlinking a
> non-existing file from a read-only filesystem
> results in EROFS instead of ENOENT.  I'd expect
> it return ENOENT - it is more logical, at least
> in my opinion.
> 
> For one, (readonly) NFS mount returns ENOENT in
> this case.

Um, it doesn't for me.   Testing on v3.0-rc1:

# ls /test/foo; rm /test/foo
ls: cannot access /test/foo: No such file or directory
rm: cannot remove `/test/foo': No such file or directory
# ls /test/null; rm /test/null
/test/null
rm: cannot remove `/test/null': Read-only file system
# grep test /proc/mounts
/dev/vdb /test ext4 ro,relatime,user_xattr,barrier=1,data=ordered 0 0

				- Ted
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