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| author | Hannes Reinecke <hare@suse.de> | 2011-01-18 10:13:11 +0100 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2011-02-12 10:33:08 -0600 |
| commit | 63583cca745f440167bf27877182dc13e19d4bcf (patch) | |
| tree | c1eb3ec5d35cd71c6373e82992710c91f2cb8bdd /include/scsi | |
| parent | 7a1e9d829f8bd821466c5ea834ad6f378740d2be (diff) | |
| download | linux-63583cca745f440167bf27877182dc13e19d4bcf.tar.gz linux-63583cca745f440167bf27877182dc13e19d4bcf.tar.bz2 linux-63583cca745f440167bf27877182dc13e19d4bcf.zip | |
[SCSI] Add detailed SCSI I/O errors
Instead of just passing 'EIO' for any I/O error we should be
notifying the upper layers with more details about the cause
of this error.
Update the possible I/O errors to:
- ENOLINK: Link failure between host and target
- EIO: Retryable I/O error
- EREMOTEIO: Non-retryable I/O error
- EBADE: I/O error restricted to the I_T_L nexus
'Retryable' in this context means that an I/O error _might_ be
restricted to the I_T_L nexus (vulgo: path), so retrying on another
nexus / path might succeed.
'Non-retryable' in general refers to a target failure, so this
error will always be generated regardless of the I_T_L nexus
it was send on.
I/O errors restricted to the I_T_L nexus might be retried
on another nexus / path, but they should _not_ be queued
if no paths are available.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'include/scsi')
| -rw-r--r-- | include/scsi/scsi.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h index 648d23358038..ead8dd054480 100644 --- a/include/scsi/scsi.h +++ b/include/scsi/scsi.h @@ -434,6 +434,10 @@ static inline int scsi_is_wlun(unsigned int lun) * recover the link. Transport class will * retry or fail IO */ #define DID_TRANSPORT_FAILFAST 0x0f /* Transport class fastfailed the io */ +#define DID_TARGET_FAILURE 0x10 /* Permanent target failure, do not retry on + * other paths */ +#define DID_NEXUS_FAILURE 0x11 /* Permanent nexus failure, retry on other + * paths might yield different results */ #define DRIVER_OK 0x00 /* Driver status */ /* @@ -463,6 +467,7 @@ static inline int scsi_is_wlun(unsigned int lun) #define TIMEOUT_ERROR 0x2007 #define SCSI_RETURN_NOT_HANDLED 0x2008 #define FAST_IO_FAIL 0x2009 +#define TARGET_ERROR 0x200A /* * Midlevel queue return values. |