4.14-stable review patch. If anyone has any objections, please let me know.
------------------ From: Jianchao Wang <[email protected]> [ Upstream commit 89d0c804392bb962553f23dc4c119d11b6bd1675 ] iscsi tcp will first send out data, then calculate and send data digest. If we don't have BDI_CAP_STABLE_WRITES, the page cache will be written in spite of the on going writeback. Consequently, wrong digest will be got and sent to target. To fix this, set BDI_CAP_STABLE_WRITES when data digest is enabled in iscsi_tcp .slave_configure callback. Signed-off-by: Jianchao Wang <[email protected]> Acked-by: Chris Leech <[email protected]> Acked-by: Lee Duncan <[email protected]> Signed-off-by: Martin K. Petersen <[email protected]> Signed-off-by: Sasha Levin <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/scsi/iscsi_tcp.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -37,6 +37,7 @@ #include <linux/kfifo.h> #include <linux/scatterlist.h> #include <linux/module.h> +#include <linux/backing-dev.h> #include <net/tcp.h> #include <scsi/scsi_cmnd.h> #include <scsi/scsi_device.h> @@ -952,6 +953,13 @@ static int iscsi_sw_tcp_slave_alloc(stru static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev) { + struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(sdev->host); + struct iscsi_session *session = tcp_sw_host->session; + struct iscsi_conn *conn = session->leadconn; + + if (conn->datadgst_en) + sdev->request_queue->backing_dev_info->capabilities + |= BDI_CAP_STABLE_WRITES; blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY); blk_queue_dma_alignment(sdev->request_queue, 0); return 0;
