diff options
| author | Benjamin Block <bblock@linux.ibm.com> | 2019-10-25 18:12:43 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2019-10-28 22:16:14 -0400 |
| commit | 92953c6e0aa77d4febcca6dd691e8192910c8a28 (patch) | |
| tree | 66df7699250f80f3893b91b600aa93f77ab1ace3 /drivers/s390/scsi/zfcp_def.h | |
| parent | 7b10db555257d1248398643a23e10cf36b50d516 (diff) | |
| download | lwn-92953c6e0aa77d4febcca6dd691e8192910c8a28.tar.gz lwn-92953c6e0aa77d4febcca6dd691e8192910c8a28.zip | |
scsi: zfcp: signal incomplete or error for sync exchange config/port data
Adds a new FSF-Request status flag (ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE)
that signal that the data received using Exchange Config Data or Exchange
Port Data was incomplete. This new flags is set in the respective handlers
during the response path.
With this patch, only the synchronous FSF-functions for each command got
support for the new flag, otherwise it is transparent.
Together with this new flag and already existing status flags the
synchronous FSF-functions are extended to now detect whether the received
data is complete, incomplete or completely invalid (this includes cases
where a command ran into a timeout). This is now signaled back to the
caller, where previously only failures on the request path would result in
a bad return-code.
For complete data the return-code remains 0. For incomplete data a new
return-code -EAGAIN is added to the function-interface. For completely
invalid data the already existing return-code -EIO is reused - formerly
this was used to signal failures on the request path.
Existing callers of the FSF-functions are adjusted so that they behave as
before for return-code 0 and -EAGAIN, to not change the user-interface. As
-EIO existed all along, it was already exposed to the user - and needed
handling - and will now also be exposed in this new special case.
Link: https://lore.kernel.org/r/e14f0702fa2b00a4d1f37c7981a13f2dd1ea2c83.1572018130.git.bblock@linux.ibm.com
Reviewed-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/s390/scsi/zfcp_def.h')
| -rw-r--r-- | drivers/s390/scsi/zfcp_def.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h index 87d2f47a6990..f5acdb67442e 100644 --- a/drivers/s390/scsi/zfcp_def.h +++ b/drivers/s390/scsi/zfcp_def.h @@ -86,6 +86,7 @@ #define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED 0x00000080 #define ZFCP_STATUS_FSFREQ_TMFUNCFAILED 0x00000200 #define ZFCP_STATUS_FSFREQ_DISMISSED 0x00001000 +#define ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE 0x00020000 /************************* STRUCTURE DEFINITIONS *****************************/ |