[SCSI] scsi_dh: add infrastructure for SCSI Device Handlers

[linux-2.6.git] / drivers / scsi / scsi_lib.c

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index a82d2fe..033c58a 100644 (file)
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1160,6 +1160,14 @@ int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req)
 
        if (ret != BLKPREP_OK)
                return ret;
+
+       if (unlikely(sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh
+                        && sdev->scsi_dh_data->scsi_dh->prep_fn)) {
+               ret = sdev->scsi_dh_data->scsi_dh->prep_fn(sdev, req);
+               if (ret != BLKPREP_OK)
+                       return ret;
+       }
+
        /*
         * Filesystem requests must transfer data.
         */