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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, 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spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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