From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 207EF612C1; Mon, 29 Jan 2024 12:41:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706532119; cv=none; b=NiufNdB9BmRbItX+UQlMfilhWUVfxWH7GHczNE4bYMtAg6N/OnM5NwzJ+VET4IQlmhZ99ydWV9aYSi4wIsBrk7Igr/mK5ui/MaV85BSNbPr13GDVFRkUuVRTD59KPF9wbK5wYk0VKXVopOmnwsR3lVolMToAQC1aQv/7qiEk0F4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706532119; c=relaxed/simple; bh=IzW8F0GJkznmN36EAvwwvImQ6UcKbxt7LXtKAbOkWZw=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Gx5asyZEC267mzSkGA36PZym/eJBHdAJSr/fmMVDH6rODLW4VvflZk8suQ9eekp0HH1alnaBLtaxJ4PdrW4Q2fZHLpXd4J8+YykR7MvQ7ZTbjFumyGxJMn6FbGHVkCWpcbiR+AwTetTqdmURQOOEr6tlITQ6DCVwfHZSzfaoaC4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AqKzbR3x; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="AqKzbR3x" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 44841C433C7; Mon, 29 Jan 2024 12:41:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1706532118; bh=IzW8F0GJkznmN36EAvwwvImQ6UcKbxt7LXtKAbOkWZw=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=AqKzbR3xjuozcRlSbdODTAl9fCOwMGTDdHzu4cRrA2hPSlrrmFGocoRjoPgF3wl4V +oRVNZ2DssHk6z+kVCVjBscTp/jBtFaFenoMG1A6YoZNs/B+WTOhVnbAdt+G5uEgmy Fht74JKXzhVdQ9MO9uEhMceLNpFCb8ycunPEpbXi1S54FuVg0a8IkZ/1VwGE9YpDmz Z/JEtIlJ90DkwXIsxJMSMKzCY5LcijHoKDcnK71kZElhTf1hiVpwVsio9NEyZVulK1 VP86JYIwBy/c+/vJP5u6ijQXtTNzIndbIQY0FqRRpfYtspbj7aoBr2FFpUwtv7CV+/ MMhfKJ8aaZw+Q== Message-ID: <0f0a4357afaa3cc98f306de555e816146654245f.camel@kernel.org> Subject: Re: [PATCH 1/2] netfs: Fix i_dio_count leak on DIO read past i_size From: Jeff Layton To: David Howells , Christian Brauner Cc: Eric Van Hensbergen , Dominique Martinet , Matthew Wilcox , netfs@lists.linux.dev, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs@lists.linux.dev, linux-erofs@lists.ozlabs.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Marc Dionne Date: Mon, 29 Jan 2024 07:41:56 -0500 In-Reply-To: <20240129094924.1221977-2-dhowells@redhat.com> References: <20240129094924.1221977-1-dhowells@redhat.com> <20240129094924.1221977-2-dhowells@redhat.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 (3.50.3-1.fc39) Precedence: bulk X-Mailing-List: netfs@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2024-01-29 at 09:49 +0000, David Howells wrote: > From: Marc Dionne >=20 > If netfs_begin_read gets a NETFS_DIO_READ request that begins > past i_size, it won't perform any i/o and just return 0. This > will leak an increment to i_dio_count that is done at the top > of the function. >=20 > This can cause subsequent buffered read requests to block > indefinitely, waiting for a non existing dio operation to complete. >=20 > Add a inode_dio_end() for the NETFS_DIO_READ case, before returning. >=20 > Signed-off-by: Marc Dionne > Signed-off-by: David Howells > cc: Jeff Layton > cc: linux-afs@lists.infradead.org > cc: netfs@lists.linux.dev > cc: linux-fsdevel@vger.kernel.org > --- > fs/netfs/io.c | 2 ++ > 1 file changed, 2 insertions(+) >=20 > diff --git a/fs/netfs/io.c b/fs/netfs/io.c > index e8ff1e61ce79..4261ad6c55b6 100644 > --- a/fs/netfs/io.c > +++ b/fs/netfs/io.c > @@ -748,6 +748,8 @@ int netfs_begin_read(struct netfs_io_request *rreq, b= ool sync) > =20 > if (!rreq->submitted) { > netfs_put_request(rreq, false, netfs_rreq_trace_put_no_submit); > + if (rreq->origin =3D=3D NETFS_DIO_READ) > + inode_dio_end(rreq->inode); > ret =3D 0; > goto out; > } >=20 >=20 Reviewed-by: Jeff Layton