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| author | Stefan Weinhuber <wein@de.ibm.com> | 2009-12-07 14:51:51 +0300 |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2009-12-07 14:51:34 +0300 |
| commit | eb6e199bef288611157b8198c25d12b32bf058d0 (patch) | |
| tree | 80737a2703a9f4d09cee2410342aeccb281413ae /drivers/s390/block/dasd_int.h | |
| parent | 626350b63ef2cd447023d3dc2a34eaa7ca01bfff (diff) | |
| download | linux-eb6e199bef288611157b8198c25d12b32bf058d0.tar.xz | |
[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.h | 3 |
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; |