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authorBoaz Harrosh <bharrosh@panasas.com>2009-04-19 19:11:42 +0300
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2009-04-27 11:05:40 -0500
commit71f32e31e5638df37904697e2d04182935add85d (patch)
tree2f1ab62477f8d5129cbae751c219a2c069fa31b8 /drivers/scsi/osd/osd_initiator.c
parentbf5e84f69618f416e89a5a53434a8c865e70252e (diff)
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[SCSI] libosd: OSD2r05: Prepare for rev5 attribute list changes
In OSD2r05 draft each attribute list element header was changed so attribute-value would be 8 bytes aligned. In OSD2r01-r04 it was aligned on 2 bytes. (This is because in OSD2r01 the complete element was 8 bytes padded at end but the header was not adjusted and caused permanent miss-alignment.) OSD1 elements are not padded and might be or might not be aligned. OSD1 is still supported. In this code we do all the code re-factoring to separate OSD1/OSD2 differences but do not change actual wire format. All wire format changes will happen in one patch later, for bisect-ability. Signed-off-by: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/osd/osd_initiator.c')
-rw-r--r--drivers/scsi/osd/osd_initiator.c86
1 files changed, 68 insertions, 18 deletions
diff --git a/drivers/scsi/osd/osd_initiator.c b/drivers/scsi/osd/osd_initiator.c
index 76de8896223..e266f803aa9 100644
--- a/drivers/scsi/osd/osd_initiator.c
+++ b/drivers/scsi/osd/osd_initiator.c
@@ -205,6 +205,69 @@ static unsigned _osd_req_alist_elem_size(struct osd_request *or, unsigned len)
osdv2_attr_list_elem_size(len);
}
+static void _osd_req_alist_elem_encode(struct osd_request *or,
+ void *attr_last, const struct osd_attr *oa)
+{
+ if (osd_req_is_ver1(or)) {
+ struct osdv1_attributes_list_element *attr = attr_last;
+
+ attr->attr_page = cpu_to_be32(oa->attr_page);
+ attr->attr_id = cpu_to_be32(oa->attr_id);
+ attr->attr_bytes = cpu_to_be16(oa->len);
+ memcpy(attr->attr_val, oa->val_ptr, oa->len);
+ } else {
+ struct osdv2_attributes_list_element *attr = attr_last;
+
+ attr->attr_page = cpu_to_be32(oa->attr_page);
+ attr->attr_id = cpu_to_be32(oa->attr_id);
+ attr->attr_bytes = cpu_to_be16(oa->len);
+ memcpy(attr->attr_val, oa->val_ptr, oa->len);
+ }
+}
+
+static int _osd_req_alist_elem_decode(struct osd_request *or,
+ void *cur_p, struct osd_attr *oa, unsigned max_bytes)
+{
+ unsigned inc;
+ if (osd_req_is_ver1(or)) {
+ struct osdv1_attributes_list_element *attr = cur_p;
+
+ if (max_bytes < sizeof(*attr))
+ return -1;
+
+ oa->len = be16_to_cpu(attr->attr_bytes);
+ inc = _osd_req_alist_elem_size(or, oa->len);
+ if (inc > max_bytes)
+ return -1;
+
+ oa->attr_page = be32_to_cpu(attr->attr_page);
+ oa->attr_id = be32_to_cpu(attr->attr_id);
+
+ /* OSD1: On empty attributes we return a pointer to 2 bytes
+ * of zeros. This keeps similar behaviour with OSD2.
+ * (See below)
+ */
+ oa->val_ptr = likely(oa->len) ? attr->attr_val :
+ (u8 *)&attr->attr_bytes;
+ } else {
+ struct osdv2_attributes_list_element *attr = cur_p;
+
+ if (max_bytes < sizeof(*attr))
+ return -1;
+
+ oa->len = be16_to_cpu(attr->attr_bytes);
+ inc = _osd_req_alist_elem_size(or, oa->len);
+ if (inc > max_bytes)
+ return -1;
+
+ oa->attr_page = be32_to_cpu(attr->attr_page);
+ oa->attr_id = be32_to_cpu(attr->attr_id);
+
+ oa->val_ptr = attr->attr_val;
+ }
+ return inc;
+}
+
static unsigned _osd_req_alist_size(struct osd_request *or, void *list_head)
{
return osd_req_is_ver1(or) ?
@@ -798,7 +861,6 @@ int osd_req_add_set_attr_list(struct osd_request *or,
attr_last = or->set_attr.buff + total_bytes;
for (; nelem; --nelem) {
- struct osd_attributes_list_element *attr;
unsigned elem_size = _osd_req_alist_elem_size(or, oa->len);
total_bytes += elem_size;
@@ -811,11 +873,7 @@ int osd_req_add_set_attr_list(struct osd_request *or,
or->set_attr.buff + or->set_attr.total_bytes;
}
- attr = attr_last;
- attr->attr_page = cpu_to_be32(oa->attr_page);
- attr->attr_id = cpu_to_be32(oa->attr_id);
- attr->attr_bytes = cpu_to_be16(oa->len);
- memcpy(attr->attr_val, oa->val_ptr, oa->len);
+ _osd_req_alist_elem_encode(or, attr_last, oa);
attr_last += elem_size;
++oa;
@@ -1070,15 +1128,10 @@ int osd_req_decode_get_attr_list(struct osd_request *or,
}
for (n = 0; (n < *nelem) && (cur_bytes < returned_bytes); ++n) {
- struct osd_attributes_list_element *attr = cur_p;
- unsigned inc;
+ int inc = _osd_req_alist_elem_decode(or, cur_p, oa,
+ returned_bytes - cur_bytes);
- oa->len = be16_to_cpu(attr->attr_bytes);
- inc = _osd_req_alist_elem_size(or, oa->len);
- OSD_DEBUG("oa->len=%d inc=%d cur_bytes=%d\n",
- oa->len, inc, cur_bytes);
- cur_bytes += inc;
- if (cur_bytes > returned_bytes) {
+ if (inc < 0) {
OSD_ERR("BAD FOOD from target. list not valid!"
"c=%d r=%d n=%d\n",
cur_bytes, returned_bytes, n);
@@ -1086,10 +1139,7 @@ int osd_req_decode_get_attr_list(struct osd_request *or,
break;
}
- oa->attr_page = be32_to_cpu(attr->attr_page);
- oa->attr_id = be32_to_cpu(attr->attr_id);
- oa->val_ptr = attr->attr_val;
-
+ cur_bytes += inc;
cur_p += inc;
++oa;
}