s390/dasd: Fail all requests when DASD_FLAG_ABORTIO is set
Whenever a DASD request encounters a timeout we might
need to abort all outstanding requests on this or
even other devices.
This is especially useful if one wants to fail all
devices on one side of a RAID10 configuration, even
though only one device exhibited an error.
To handle this I've introduced a new device flag
DASD_FLAG_ABORTIO.
This flag is evaluated in __dasd_process_request_queue()
and will invoke blk_abort_request() for all
outstanding requests with DASD_CQR_FLAGS_FAILFAST set.
This will cause any of these requests to be aborted
immediately if the blk_timeout function is activated.
The DASD_FLAG_ABORTIO is also evaluated in
__dasd_process_request_queue to abort all
new request which would have the
DASD_CQR_FLAGS_FAILFAST bit set.
The flag can be set with the new ioctls 'BIODASDABORTIO'
and removed with 'BIODASDALLOWIO'.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 54f4bb8..17150a7 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -38,9 +38,6 @@
*/
#define DASD_CHANQ_MAX_SIZE 4
-#define DASD_SLEEPON_START_TAG (void *) 1
-#define DASD_SLEEPON_END_TAG (void *) 2
-
/*
* SECTION: exported variables of dasd.c
*/
@@ -2535,6 +2532,16 @@
__blk_end_request_all(req, -EIO);
continue;
}
+ if (test_bit(DASD_FLAG_ABORTALL, &basedev->flags) &&
+ (basedev->features & DASD_FEATURE_FAILFAST ||
+ blk_noretry_request(req))) {
+ DBF_DEV_EVENT(DBF_ERR, basedev,
+ "Rejecting failfast request %p",
+ req);
+ blk_start_request(req);
+ __blk_end_request_all(req, -ETIMEDOUT);
+ continue;
+ }
cqr = basedev->discipline->build_cp(basedev, block, req);
if (IS_ERR(cqr)) {
if (PTR_ERR(cqr) == -EBUSY)