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[S390] cio: provide fake irb for transport mode IO

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If a driver wants to do command mode IO while CIO is doing
online path verification we ignore this request and provide
a fake irb when we are done and the driver can do IO again.

For transport mode IO we have no such mechanism, giving the
driver no other chance then to retry the action until we are
done. This is not very reliable.

Provide a fake irb for transport mode IO as well.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott
2011-12-01 13:32:21 +01:00
committed by Martin Schwidefsky
parent 659213b899
commit 50c8e31f38
3 changed files with 37 additions and 10 deletions
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5
drivers/s390/cio/io_sch.h
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@@ -111,6 +111,9 @@ enum cdev_todo {
CDEV_TODO_UNREG_EVAL,
};
#define FAKE_CMD_IRB 1
#define FAKE_TM_IRB 2
struct ccw_device_private {
struct ccw_device *cdev;
struct subchannel *sch;
@@ -138,7 +141,7 @@ struct ccw_device_private {
unsigned int doverify:1; /* delayed path verification */
unsigned int donotify:1; /* call notify function */
unsigned int recog_done:1; /* dev. recog. complete */
unsigned int fake_irb:1; /* deliver faked irb */
unsigned int fake_irb:2; /* deliver faked irb */
unsigned int resuming:1; /* recognition while resume */
unsigned int pgroup:1; /* pathgroup is set up */
unsigned int mpath:1; /* multipathing is set up */