rbd: store data_type in img_req instead of obj_req

All object requests are associated with an image request now -- avoid
duplicating the same info in each object request.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 7ec4d14..6ce9e0b 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -258,7 +258,6 @@ struct rbd_obj_request {
        /* links for img_request->obj_requests list */
        struct list_head        links;
 
-       enum obj_request_type   type;
        union {
                struct ceph_bio_iter    bio_pos;
                struct {
@@ -285,6 +284,7 @@ enum img_req_flags {
 struct rbd_img_request {
        struct rbd_device       *rbd_dev;
        enum obj_operation_type op_type;
+       enum obj_request_type   data_type;
        u64                     offset; /* starting image byte offset */
        u64                     length; /* byte count from offset */
        unsigned long           flags;
@@ -1270,7 +1270,7 @@ static void zero_bvecs(struct ceph_bvec_iter *bvec_pos, u32 off, u32 bytes)
 static void rbd_obj_zero_range(struct rbd_obj_request *obj_req, u32 off,
                               u32 bytes)
 {
-       switch (obj_req->type) {
+       switch (obj_req->img_request->data_type) {
        case OBJ_REQUEST_BIO:
                zero_bios(&obj_req->bio_pos, off, bytes);
                break;
@@ -1348,22 +1348,9 @@ static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request,
        rbd_assert(img_request->obj_request_count > 0);
        img_request->obj_request_count--;
        rbd_assert(obj_request->img_request == img_request);
-       obj_request->img_request = NULL;
        rbd_obj_request_put(obj_request);
 }
 
-static bool obj_request_type_valid(enum obj_request_type type)
-{
-       switch (type) {
-       case OBJ_REQUEST_NODATA:
-       case OBJ_REQUEST_BIO:
-       case OBJ_REQUEST_BVECS:
-               return true;
-       default:
-               return false;
-       }
-}
-
 static void rbd_obj_request_submit(struct rbd_obj_request *obj_request)
 {
        struct ceph_osd_request *osd_req = obj_request->osd_req;
@@ -1524,18 +1511,14 @@ static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req)
        ceph_osdc_put_request(osd_req);
 }
 
-static struct rbd_obj_request *
-rbd_obj_request_create(enum obj_request_type type)
+static struct rbd_obj_request *rbd_obj_request_create(void)
 {
        struct rbd_obj_request *obj_request;
 
-       rbd_assert(obj_request_type_valid(type));
-
        obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_NOIO);
        if (!obj_request)
                return NULL;
 
-       obj_request->type = type;
        INIT_LIST_HEAD(&obj_request->links);
        kref_init(&obj_request->kref);
 
@@ -1552,12 +1535,10 @@ static void rbd_obj_request_destroy(struct kref *kref)
 
        dout("%s: obj %p\n", __func__, obj_request);
 
-       rbd_assert(obj_request->img_request == NULL);
-
        if (obj_request->osd_req)
                rbd_osd_req_destroy(obj_request->osd_req);
 
-       switch (obj_request->type) {
+       switch (obj_request->img_request->data_type) {
        case OBJ_REQUEST_NODATA:
        case OBJ_REQUEST_BIO:
        case OBJ_REQUEST_BVECS:
@@ -1742,7 +1723,7 @@ static void rbd_parent_request_destroy(struct kref *kref)
 
 static void rbd_osd_req_setup_data(struct rbd_obj_request *obj_req, u32 which)
 {
-       switch (obj_req->type) {
+       switch (obj_req->img_request->data_type) {
        case OBJ_REQUEST_BIO:
                osd_req_op_extent_osd_data_bio(obj_req->osd_req, which,
                                               &obj_req->bio_pos,
@@ -1979,7 +1960,7 @@ static int rbd_img_request_fill(struct rbd_img_request *img_request,
                u64 offset = rbd_segment_offset(rbd_dev, img_offset);
                u64 length = rbd_segment_length(rbd_dev, img_offset, resid);
 
-               obj_request = rbd_obj_request_create(type);
+               obj_request = rbd_obj_request_create();
                if (!obj_request)
                        goto out_unwind;
 
@@ -2008,6 +1989,7 @@ static int rbd_img_request_fill(struct rbd_img_request *img_request,
                resid -= length;
        }
 
+       img_request->data_type = type;
        return __rbd_img_fill_request(img_request);
 
 out_unwind:
@@ -2042,7 +2024,7 @@ static int rbd_obj_read_from_parent(struct rbd_obj_request *obj_req,
                return -ENOMEM;
 
        if (!rbd_img_is_write(img_req)) {
-               switch (obj_req->type) {
+               switch (img_req->data_type) {
                case OBJ_REQUEST_BIO:
                        ret = rbd_img_request_fill(child_img_req,
                                                   OBJ_REQUEST_BIO,