Commit aa9fffbe authored by Boaz Harrosh's avatar Boaz Harrosh Committed by James Bottomley

[SCSI] libosd: Error handling revamped

Administer some love to the osd_req_decode_sense function

* Fix a bad bug with osd_req_decode_sense(). If there was no scsi
  residual, .i.e the request never reached the target, then all the
  osd_sense_info members where garbage.

* Add grossly missing in/out_resid to osd_sense_info and fill them in
  properly.

* Define an osd_err_priority enum which divides the possible errors into
  7 categories in ascending severity. Each category is also assigned a
  Linux return code translation.

  Analyze the different osd/scsi/block returned errors and set the
  proper osd_err_priority and Linux return code accordingly.

* extra check a few situations so not to get stuck with inconsistent
  error view. Example an empty residual with an error code, and other
  places ...

Lots of libosd's osd_req_decode_sense clients had this logic in some
form or another. Consolidate all these into one place that should
actually know about osd returns. Thous translating it to a more
abstract error.
Signed-off-by: default avatarBoaz Harrosh <bharrosh@panasas.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
parent eff21490
......@@ -475,7 +475,8 @@ EXPORT_SYMBOL(osd_end_request);
int osd_execute_request(struct osd_request *or)
{
return blk_execute_rq(or->request->q, NULL, or->request, 0);
return or->async_error =
blk_execute_rq(or->request->q, NULL, or->request, 0);
}
EXPORT_SYMBOL(osd_execute_request);
......@@ -485,8 +486,12 @@ static void osd_request_async_done(struct request *req, int error)
or->async_error = error;
if (error)
OSD_DEBUG("osd_request_async_done error recieved %d\n", error);
if (unlikely(error)) {
OSD_DEBUG("osd_request_async_done error recieved %d "
"errors 0x%x\n", error, req->errors);
if (!req->errors) /* don't miss out on this one */
req->errors = error;
}
if (or->async_done)
or->async_done(or, or->async_private);
......@@ -1451,6 +1456,15 @@ int osd_finalize_request(struct osd_request *or,
}
EXPORT_SYMBOL(osd_finalize_request);
static bool _is_osd_security_code(int code)
{
return (code == osd_security_audit_value_frozen) ||
(code == osd_security_working_key_frozen) ||
(code == osd_nonce_not_unique) ||
(code == osd_nonce_timestamp_out_of_range) ||
(code == osd_invalid_dataout_buffer_integrity_check_value);
}
#define OSD_SENSE_PRINT1(fmt, a...) \
do { \
if (__cur_sense_need_output) \
......@@ -1473,9 +1487,16 @@ int osd_req_decode_sense_full(struct osd_request *or,
#else
bool __cur_sense_need_output = !silent;
#endif
int ret;
if (!or->request->errors)
if (likely(!or->request->errors)) {
osi->out_resid = 0;
osi->in_resid = 0;
return 0;
}
osi = osi ? : &local_osi;
memset(osi, 0, sizeof(*osi));
ssdb = or->request->sense;
sense_len = or->request->sense_len;
......@@ -1483,17 +1504,15 @@ int osd_req_decode_sense_full(struct osd_request *or,
OSD_ERR("Block-layer returned error(0x%x) but "
"sense_len(%u) || key(%d) is empty\n",
or->request->errors, sense_len, ssdb->sense_key);
return -EIO;
goto analyze;
}
if ((ssdb->response_code != 0x72) && (ssdb->response_code != 0x73)) {
OSD_ERR("Unrecognized scsi sense: rcode=%x length=%d\n",
ssdb->response_code, sense_len);
return -EIO;
goto analyze;
}
osi = osi ? : &local_osi;
memset(osi, 0, sizeof(*osi));
osi->key = ssdb->sense_key;
osi->additional_code = be16_to_cpu(ssdb->additional_sense_code);
original_sense_len = ssdb->additional_sense_length + 8;
......@@ -1503,9 +1522,10 @@ int osd_req_decode_sense_full(struct osd_request *or,
__cur_sense_need_output = (osi->key > scsi_sk_recovered_error);
#endif
OSD_SENSE_PRINT1("Main Sense information key=0x%x length(%d, %d) "
"additional_code=0x%x\n",
"additional_code=0x%x async_error=%d errors=0x%x\n",
osi->key, original_sense_len, sense_len,
osi->additional_code);
osi->additional_code, or->async_error,
or->request->errors);
if (original_sense_len < sense_len)
sense_len = original_sense_len;
......@@ -1637,7 +1657,50 @@ int osd_req_decode_sense_full(struct osd_request *or,
cur_descriptor += cur_len;
}
return (osi->key > scsi_sk_recovered_error) ? -EIO : 0;
analyze:
if (!osi->key) {
/* scsi sense is Empty, the request was never issued to target
* linux return code might tell us what happened.
*/
if (or->async_error == -ENOMEM)
osi->osd_err_pri = OSD_ERR_PRI_RESOURCE;
else
osi->osd_err_pri = OSD_ERR_PRI_UNREACHABLE;
ret = or->async_error;
} else if (osi->key <= scsi_sk_recovered_error) {
osi->osd_err_pri = 0;
ret = 0;
} else if (osi->additional_code == scsi_invalid_field_in_cdb) {
if (osi->cdb_field_offset == OSD_CFO_STARTING_BYTE) {
osi->osd_err_pri = OSD_ERR_PRI_CLEAR_PAGES;
ret = -EFAULT; /* caller should recover from this */
} else if (osi->cdb_field_offset == OSD_CFO_OBJECT_ID) {
osi->osd_err_pri = OSD_ERR_PRI_NOT_FOUND;
ret = -ENOENT;
} else if (osi->cdb_field_offset == OSD_CFO_PERMISSIONS) {
osi->osd_err_pri = OSD_ERR_PRI_NO_ACCESS;
ret = -EACCES;
} else {
osi->osd_err_pri = OSD_ERR_PRI_BAD_CRED;
ret = -EINVAL;
}
} else if (osi->additional_code == osd_quota_error) {
osi->osd_err_pri = OSD_ERR_PRI_NO_SPACE;
ret = -ENOSPC;
} else if (_is_osd_security_code(osi->additional_code)) {
osi->osd_err_pri = OSD_ERR_PRI_BAD_CRED;
ret = -EINVAL;
} else {
osi->osd_err_pri = OSD_ERR_PRI_EIO;
ret = -EIO;
}
if (or->out.req)
osi->out_resid = or->out.req->resid_len ?: or->out.total_bytes;
if (or->in.req)
osi->in_resid = or->in.req->resid_len ?: or->in.total_bytes;
return ret;
}
EXPORT_SYMBOL(osd_req_decode_sense_full);
......
......@@ -267,7 +267,7 @@ int osd_execute_request_async(struct osd_request *or,
* @bad_attr_list - List of failing attributes (optional)
* @max_attr - Size of @bad_attr_list.
*
* After execution, sense + return code can be analyzed using this function. The
* After execution, osd_request results are analyzed using this function. The
* return code is the final disposition on the error. So it is possible that a
* CHECK_CONDITION was returned from target but this will return NO_ERROR, for
* example on recovered errors. All parameters are optional if caller does
......@@ -276,7 +276,31 @@ int osd_execute_request_async(struct osd_request *or,
* of the SCSI_OSD_DPRINT_SENSE Kconfig value. Set @silent if you know the
* command would routinely fail, to not spam the dmsg file.
*/
/**
* osd_err_priority - osd categorized return codes in ascending severity.
*
* The categories are borrowed from the pnfs_osd_errno enum.
* See comments for translated Linux codes returned by osd_req_decode_sense.
*/
enum osd_err_priority {
OSD_ERR_PRI_NO_ERROR = 0,
/* Recoverable, caller should clear_highpage() all pages */
OSD_ERR_PRI_CLEAR_PAGES = 1, /* -EFAULT */
OSD_ERR_PRI_RESOURCE = 2, /* -ENOMEM */
OSD_ERR_PRI_BAD_CRED = 3, /* -EINVAL */
OSD_ERR_PRI_NO_ACCESS = 4, /* -EACCES */
OSD_ERR_PRI_UNREACHABLE = 5, /* any other */
OSD_ERR_PRI_NOT_FOUND = 6, /* -ENOENT */
OSD_ERR_PRI_NO_SPACE = 7, /* -ENOSPC */
OSD_ERR_PRI_EIO = 8, /* -EIO */
};
struct osd_sense_info {
u64 out_resid; /* Zero on success otherwise out residual */
u64 in_resid; /* Zero on success otherwise in residual */
enum osd_err_priority osd_err_pri;
int key; /* one of enum scsi_sense_keys */
int additional_code ; /* enum osd_additional_sense_codes */
union { /* Sense specific information */
......
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