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[S390] cio: improve error recovery for internal I/Os

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Improve error recovery for internal I/Os by repeating each I/O
256 times per path to cope with long-running non-permanent error
conditions. Also retry each path twice to cope with link flapping,
i.e. single paths becoming unavailable in the order in which they
are tried.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Peter Oberparleiter
2009-12-07 12:51:40 +01:00
committed by Martin Schwidefsky
parent 7a8ad1001c
commit de1b04388f
4 changed files with 7 additions and 6 deletions
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2
drivers/s390/cio/io_sch.h
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@@ -109,7 +109,7 @@ struct ccw_request {
void (*callback)(struct ccw_device *, void *, int);
void *data;
/* These fields are used internally. */
u8 mask;
u16 mask;
u16 retries;
int drc;
int cancel:1;