[PATCH] s390: dasd failfast support

To properly support multipath-failover handling, the linux block layer has
introduced a special request flag, 'REQ_FAILFAST'.  This flag is now used to
return requests immediately in case the device is not operational.

Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/s390/block/dasd_fba.c b/drivers/s390/block/dasd_fba.c
index 28cb4613b7f5..9bac8d87a9cc 100644
--- a/drivers/s390/block/dasd_fba.c
+++ b/drivers/s390/block/dasd_fba.c
@@ -4,7 +4,7 @@
  * Bugreports.to..: <Linux390@de.ibm.com>
  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
  *
- * $Revision: 1.40 $
+ * $Revision: 1.41 $
  */
 
 #include <linux/config.h>
@@ -352,6 +352,8 @@ dasd_fba_build_cp(struct dasd_device * device, struct request *req)
                         recid++;
                 }
         }
+        if (req->flags & REQ_FAILFAST)
+                set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
         cqr->device = device;
         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
         cqr->retries = 32;