scsi: iscsi_tcp: set BDI_CAP_STABLE_WRITES when data digest enabled
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 <jianchao.w.wang@oracle.com> Acked-by: Chris Leech <cleech@redhat.com> Acked-by: Lee Duncan <lduncan@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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@ -37,6 +37,7 @@
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#include <linux/kfifo.h>
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#include <linux/scatterlist.h>
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#include <linux/module.h>
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#include <linux/backing-dev.h>
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#include <net/tcp.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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@ -954,6 +955,13 @@ static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev)
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static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
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{
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struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(sdev->host);
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struct iscsi_session *session = tcp_sw_host->session;
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struct iscsi_conn *conn = session->leadconn;
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if (conn->datadgst_en)
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sdev->request_queue->backing_dev_info->capabilities
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|= BDI_CAP_STABLE_WRITES;
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blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY);
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blk_queue_dma_alignment(sdev->request_queue, 0);
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return 0;
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