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Mon, 29 Jan 2024 04:49:32 -0500 X-MC-Unique: 2MqNdY6VNp-CfaPkR9IzXg-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id C0F563C2B606; Mon, 29 Jan 2024 09:49:31 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.42.28.245]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4EF73492BC7; Mon, 29 Jan 2024 09:49:29 +0000 (UTC) From: David Howells To: Christian Brauner Subject: [PATCH 1/2] netfs: Fix i_dio_count leak on DIO read past i_size Date: Mon, 29 Jan 2024 09:49:18 +0000 Message-ID: <20240129094924.1221977-2-dhowells@redhat.com> In-Reply-To: <20240129094924.1221977-1-dhowells@redhat.com> References: <20240129094924.1221977-1-dhowells@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.9 X-BeenThere: linux-erofs@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development of Linux EROFS file system List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, v9fs@lists.linux.dev, Dominique Martinet , Jeff Layton , linux-kernel@vger.kernel.org, Matthew Wilcox , David Howells , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, netfs@lists.linux.dev, ceph-devel@vger.kernel.org, Eric Van Hensbergen , linux-erofs@lists.ozlabs.org, linux-afs@lists.infradead.org, Marc Dionne Errors-To: linux-erofs-bounces+linux-erofs=archiver.kernel.org@lists.ozlabs.org Sender: "Linux-erofs" From: Marc Dionne 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. This can cause subsequent buffered read requests to block indefinitely, waiting for a non existing dio operation to complete. Add a inode_dio_end() for the NETFS_DIO_READ case, before returning. 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(+) 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, bool sync) if (!rreq->submitted) { netfs_put_request(rreq, false, netfs_rreq_trace_put_no_submit); + if (rreq->origin == NETFS_DIO_READ) + inode_dio_end(rreq->inode); ret = 0; goto out; }