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authorBoaz Harrosh <bharrosh@panasas.com>2009-11-16 20:48:38 +0200
committerJames Bottomley <James.Bottomley@suse.de>2009-12-04 12:01:47 -0600
commitaa9fffbe2c4db4557248c5c626a85bf3c7867044 (patch)
treee719a15e185a35f09e489a5a9f2a72d73c598dd1
parent[SCSI] libosd: Bugfix of error handling in attributes-list decoding (diff)
downloadlinux-dev-aa9fffbe2c4db4557248c5c626a85bf3c7867044.tar.xz
linux-dev-aa9fffbe2c4db4557248c5c626a85bf3c7867044.zip
[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: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
-rw-r--r--drivers/scsi/osd/osd_initiator.c85
-rw-r--r--include/scsi/osd_initiator.h26
2 files changed, 99 insertions, 12 deletions
diff --git a/drivers/scsi/osd/osd_initiator.c b/drivers/scsi/osd/osd_initiator.c
index ba25b1e58a6c..950202a70bcf 100644
--- a/drivers/scsi/osd/osd_initiator.c
+++ b/drivers/scsi/osd/osd_initiator.c
@@ -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);
diff --git a/include/scsi/osd_initiator.h b/include/scsi/osd_initiator.h
index 3ec346e15dda..39d6d1097153 100644
--- a/include/scsi/osd_initiator.h
+++ b/include/scsi/osd_initiator.h
@@ -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 */