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authorStefan Weinhuber <wein@de.ibm.com>2009-12-07 12:51:51 +0100
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2009-12-07 12:51:34 +0100
commiteb6e199bef288611157b8198c25d12b32bf058d0 (patch)
tree80737a2703a9f4d09cee2410342aeccb281413ae /drivers/s390/block/dasd_int.h
parent626350b63ef2cd447023d3dc2a34eaa7ca01bfff (diff)
[S390] dasd: improve error recovery for internal I/O
Most of the error conditions reported by a FICON storage server indicate situations which can be recovered. Sometimes the host just needs to retry an I/O request, but sometimes the recovery is more complex and requires the device driver to wait, choose a different path, etc. The DASD device driver has a fully featured error recovery for normal block layer I/O, but not for internal I/O request which are for example used during the device bring up. This can lead to situations where the IPL of a system fails because DASD devices are not properly recognized. This patch will extend the internal I/O handling to use the existing error recovery procedures. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/block/dasd_int.h')
-rw-r--r--drivers/s390/block/dasd_int.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index 8afd9fa00875..8c2ea045188e 100644
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -595,6 +595,9 @@ int dasd_generic_restore_device(struct ccw_device *);
int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
char *dasd_get_sense(struct irb *);
+void dasd_device_set_stop_bits(struct dasd_device *, int);
+void dasd_device_remove_stop_bits(struct dasd_device *, int);
+
/* externals in dasd_devmap.c */
extern int dasd_max_devindex;
extern int dasd_probeonly;