libceph: kill off osd request r_data_in and r_data_out

Finally!  Convert the osd op data pointers into real structures, and
make the switch over to using them instead of having all ops share
the in and/or out data structures in the osd request.

Set up a new function to traverse the set of ops and release any
data associated with them (pages).

This and the patches leading up to it resolve:
    http://tracker.ceph.com/issues/4657

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

1 files changed, 39 insertions, 40 deletions

diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index cc4003fdc01f..2562e4e52245 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -121,8 +121,7 @@ osd_req_op_extent_osd_data(struct ceph_osd_request *osd_req,
 {
         BUG_ON(which >= osd_req->r_num_ops);
 
-        /* return &osd_req->r_ops[which].extent.osd_data; */
-        return write_request ? &osd_req->r_data_out : &osd_req->r_data_in;
+        return &osd_req->r_ops[which].extent.osd_data;
 }
 EXPORT_SYMBOL(osd_req_op_extent_osd_data);
 
@@ -132,8 +131,7 @@ osd_req_op_cls_request_info(struct ceph_osd_request *osd_req,
 {
         BUG_ON(which >= osd_req->r_num_ops);
 
-        /* return &osd_req->r_ops[which].cls.request_info; */
-        return &osd_req->r_data_out;    /* Request data is outgoing */
+        return &osd_req->r_ops[which].cls.request_info;
 }
 EXPORT_SYMBOL(osd_req_op_cls_request_info);     /* ??? */
 
@@ -143,8 +141,7 @@ osd_req_op_cls_response_data(struct ceph_osd_request *osd_req,
 {
         BUG_ON(which >= osd_req->r_num_ops);
 
-        /* return &osd_req->r_ops[which].cls.response_data; */
-        return &osd_req->r_data_in;     /* Response data is incoming */
+        return &osd_req->r_ops[which].cls.response_data;
 }
 EXPORT_SYMBOL(osd_req_op_cls_response_data);    /* ??? */
 
@@ -158,9 +155,6 @@ void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *osd_req,
         osd_data = osd_req_op_extent_osd_data(osd_req, which, write_request);
         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
                                 pages_from_pool, own_pages);
-
-        osd_req->r_ops[which].extent.osd_data =
-                osd_req_op_extent_osd_data(osd_req, which, write_request);
 }
 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pages);
 
@@ -172,9 +166,6 @@ void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *osd_req,
 
         osd_data = osd_req_op_extent_osd_data(osd_req, which, write_request);
         ceph_osd_data_pagelist_init(osd_data, pagelist);
-
-        osd_req->r_ops[which].extent.osd_data =
-                osd_req_op_extent_osd_data(osd_req, which, write_request);
 }
 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pagelist);
 
@@ -187,9 +178,6 @@ void osd_req_op_extent_osd_data_bio(struct ceph_osd_request *osd_req,
 
         osd_data = osd_req_op_extent_osd_data(osd_req, which, write_request);
         ceph_osd_data_bio_init(osd_data, bio, bio_length);
-
-        osd_req->r_ops[which].extent.osd_data =
-                osd_req_op_extent_osd_data(osd_req, which, write_request);
 }
 EXPORT_SYMBOL(osd_req_op_extent_osd_data_bio);
 #endif /* CONFIG_BLOCK */
@@ -202,9 +190,6 @@ static void osd_req_op_cls_request_info_pagelist(
 
         osd_data = osd_req_op_cls_request_info(osd_req, which);
         ceph_osd_data_pagelist_init(osd_data, pagelist);
-
-        osd_req->r_ops[which].cls.request_info =
-                osd_req_op_cls_request_info(osd_req, which);
 }
 
 void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req,
@@ -216,9 +201,6 @@ void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req,
         osd_data = osd_req_op_cls_response_data(osd_req, which);
         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
                                 pages_from_pool, own_pages);
-
-        osd_req->r_ops[which].cls.response_data =
-                osd_req_op_cls_response_data(osd_req, which);
 }
 EXPORT_SYMBOL(osd_req_op_cls_response_data_pages);
 
@@ -241,18 +223,39 @@ static u64 ceph_osd_data_length(struct ceph_osd_data *osd_data)
         }
 }
 
+
 static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
 {
-        if (osd_data->type != CEPH_OSD_DATA_TYPE_PAGES)
-                return;
-
-        if (osd_data->own_pages) {
+        if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES && osd_data->own_pages) {
                 int num_pages;
 
                 num_pages = calc_pages_for((u64)osd_data->alignment,
                                                 (u64)osd_data->length);
                 ceph_release_page_vector(osd_data->pages, num_pages);
         }
+        ceph_osd_data_init(osd_data);
+}
+
+static void osd_req_op_data_release(struct ceph_osd_request *osd_req,
+                        unsigned int which)
+{
+        struct ceph_osd_req_op *op;
+
+        BUG_ON(which >= osd_req->r_num_ops);
+        op = &osd_req->r_ops[which];
+
+        switch (op->op) {
+        case CEPH_OSD_OP_READ:
+        case CEPH_OSD_OP_WRITE:
+                ceph_osd_data_release(&op->extent.osd_data);
+                break;
+        case CEPH_OSD_OP_CALL:
+                ceph_osd_data_release(&op->cls.request_info);
+                ceph_osd_data_release(&op->cls.response_data);
+                break;
+        default:
+                break;
+        }
 }
 
 /*
@@ -261,6 +264,7 @@ static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
 void ceph_osdc_release_request(struct kref *kref)
 {
         struct ceph_osd_request *req;
+        unsigned int which;
 
         req = container_of(kref, struct ceph_osd_request, r_kref);
         if (req->r_request)
@@ -270,8 +274,8 @@ void ceph_osdc_release_request(struct kref *kref)
                 ceph_msg_put(req->r_reply);
         }
 
-        ceph_osd_data_release(&req->r_data_in);
-        ceph_osd_data_release(&req->r_data_out);
+        for (which = 0; which < req->r_num_ops; which++)
+                osd_req_op_data_release(req, which);
 
         ceph_put_snap_context(req->r_snapc);
         if (req->r_mempool)
@@ -595,27 +599,22 @@ static u64 osd_req_encode_op(struct ceph_osd_request *req,
                         cpu_to_le64(src->extent.truncate_size);
                 dst->extent.truncate_seq =
                         cpu_to_le32(src->extent.truncate_seq);
-                if (src->op == CEPH_OSD_OP_WRITE) {
-                        WARN_ON(src->extent.osd_data != &req->r_data_out);
+                if (src->op == CEPH_OSD_OP_WRITE)
                         ceph_osdc_msg_data_set(req->r_request,
-                                                src->extent.osd_data);
-                } else {
-                        WARN_ON(src->extent.osd_data != &req->r_data_in);
+                                                &src->extent.osd_data);
+                else
                         ceph_osdc_msg_data_set(req->r_reply,
-                                                src->extent.osd_data);
-                }
+                                                &src->extent.osd_data);
                 break;
         case CEPH_OSD_OP_CALL:
                 dst->cls.class_len = src->cls.class_len;
                 dst->cls.method_len = src->cls.method_len;
                 dst->cls.indata_len = cpu_to_le32(src->cls.request_data_len);
-                WARN_ON(src->cls.response_data != &req->r_data_in);
-                ceph_osdc_msg_data_set(req->r_reply, src->cls.response_data);
-                WARN_ON(src->cls.request_info != &req->r_data_out);
-                ceph_osdc_msg_data_set(req->r_request, src->cls.request_info);
-                BUG_ON(src->cls.request_info->type !=
+                ceph_osdc_msg_data_set(req->r_reply, &src->cls.response_data);
+                ceph_osdc_msg_data_set(req->r_request, &src->cls.request_info);
+                BUG_ON(src->cls.request_info.type !=
                                         CEPH_OSD_DATA_TYPE_PAGELIST);
-                request_data_len = src->cls.request_info->pagelist->length;
+                request_data_len = src->cls.request_info.pagelist->length;
                 break;
         case CEPH_OSD_OP_STARTSYNC:
                 break;