mirror of https://gitee.com/openkylin/linux.git
rbd: switch to common striping framework
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov
parent
2bb1e56ec6
commit
5a237819aa
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@ -1326,7 +1326,6 @@ static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request,
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obj_request->img_request = img_request;
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img_request->obj_request_count++;
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img_request->pending_count++;
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list_add_tail(&obj_request->ex.oe_item, &img_request->object_extents);
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dout("%s: img %p obj %p\n", __func__, img_request, obj_request);
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}
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@ -2055,6 +2054,158 @@ static int rbd_img_request_fill(struct rbd_img_request *img_request,
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return -ENOMEM;
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}
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union rbd_img_fill_iter {
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struct ceph_bio_iter bio_iter;
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struct ceph_bvec_iter bvec_iter;
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};
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struct rbd_img_fill_ctx {
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enum obj_request_type pos_type;
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union rbd_img_fill_iter *pos;
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union rbd_img_fill_iter iter;
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ceph_object_extent_fn_t set_pos_fn;
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};
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static struct ceph_object_extent *alloc_object_extent(void *arg)
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{
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struct rbd_img_request *img_req = arg;
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struct rbd_obj_request *obj_req;
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obj_req = rbd_obj_request_create();
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if (!obj_req)
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return NULL;
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rbd_img_obj_request_add(img_req, obj_req);
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return &obj_req->ex;
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}
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/*
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* Map a list of image extents to a list of object extents, create the
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* corresponding object requests (normally each to a different object,
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* but not always) and add them to @img_req. For each object request,
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* set up its data descriptor to point to the corresponding chunk of
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* @fctx->pos data buffer.
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*
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* @fctx->pos data buffer is assumed to be large enough.
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*/
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static int rbd_img_fill_request(struct rbd_img_request *img_req,
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struct ceph_file_extent *img_extents,
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u32 num_img_extents,
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struct rbd_img_fill_ctx *fctx)
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{
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u32 i;
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int ret;
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img_req->data_type = fctx->pos_type;
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/*
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* Create object requests and set each object request's starting
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* position in the provided bio (list) or bio_vec array.
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*/
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fctx->iter = *fctx->pos;
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for (i = 0; i < num_img_extents; i++) {
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ret = ceph_file_to_extents(&img_req->rbd_dev->layout,
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img_extents[i].fe_off,
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img_extents[i].fe_len,
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&img_req->object_extents,
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alloc_object_extent, img_req,
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fctx->set_pos_fn, &fctx->iter);
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if (ret)
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return ret;
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}
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return __rbd_img_fill_request(img_req);
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}
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static int rbd_img_fill_nodata(struct rbd_img_request *img_req,
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u64 off, u64 len)
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{
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struct ceph_file_extent ex = { off, len };
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union rbd_img_fill_iter dummy;
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struct rbd_img_fill_ctx fctx = {
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.pos_type = OBJ_REQUEST_NODATA,
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.pos = &dummy,
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};
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return rbd_img_fill_request(img_req, &ex, 1, &fctx);
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}
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static void set_bio_pos(struct ceph_object_extent *ex, u32 bytes, void *arg)
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{
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struct rbd_obj_request *obj_req =
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container_of(ex, struct rbd_obj_request, ex);
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struct ceph_bio_iter *it = arg;
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dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes);
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obj_req->bio_pos = *it;
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ceph_bio_iter_advance(it, bytes);
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}
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static int __rbd_img_fill_from_bio(struct rbd_img_request *img_req,
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struct ceph_file_extent *img_extents,
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u32 num_img_extents,
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struct ceph_bio_iter *bio_pos)
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{
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struct rbd_img_fill_ctx fctx = {
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.pos_type = OBJ_REQUEST_BIO,
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.pos = (union rbd_img_fill_iter *)bio_pos,
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.set_pos_fn = set_bio_pos,
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};
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return rbd_img_fill_request(img_req, img_extents, num_img_extents,
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&fctx);
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}
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static int rbd_img_fill_from_bio(struct rbd_img_request *img_req,
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u64 off, u64 len, struct bio *bio)
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{
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struct ceph_file_extent ex = { off, len };
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struct ceph_bio_iter it = { .bio = bio, .iter = bio->bi_iter };
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return __rbd_img_fill_from_bio(img_req, &ex, 1, &it);
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}
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static void set_bvec_pos(struct ceph_object_extent *ex, u32 bytes, void *arg)
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{
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struct rbd_obj_request *obj_req =
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container_of(ex, struct rbd_obj_request, ex);
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struct ceph_bvec_iter *it = arg;
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obj_req->bvec_pos = *it;
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ceph_bvec_iter_shorten(&obj_req->bvec_pos, bytes);
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ceph_bvec_iter_advance(it, bytes);
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}
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static int __rbd_img_fill_from_bvecs(struct rbd_img_request *img_req,
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struct ceph_file_extent *img_extents,
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u32 num_img_extents,
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struct ceph_bvec_iter *bvec_pos)
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{
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struct rbd_img_fill_ctx fctx = {
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.pos_type = OBJ_REQUEST_BVECS,
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.pos = (union rbd_img_fill_iter *)bvec_pos,
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.set_pos_fn = set_bvec_pos,
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};
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return rbd_img_fill_request(img_req, img_extents, num_img_extents,
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&fctx);
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}
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static int rbd_img_fill_from_bvecs(struct rbd_img_request *img_req,
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struct ceph_file_extent *img_extents,
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u32 num_img_extents,
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struct bio_vec *bvecs)
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{
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struct ceph_bvec_iter it = {
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.bvecs = bvecs,
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.iter = { .bi_size = ceph_file_extents_bytes(img_extents,
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num_img_extents) },
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};
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return __rbd_img_fill_from_bvecs(img_req, img_extents, num_img_extents,
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&it);
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}
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static void rbd_img_request_submit(struct rbd_img_request *img_request)
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{
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struct rbd_obj_request *obj_request;
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@ -2083,26 +2234,25 @@ static int rbd_obj_read_from_parent(struct rbd_obj_request *obj_req)
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if (!rbd_img_is_write(img_req)) {
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switch (img_req->data_type) {
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case OBJ_REQUEST_BIO:
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ret = rbd_img_request_fill(child_img_req,
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OBJ_REQUEST_BIO,
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&obj_req->bio_pos);
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ret = __rbd_img_fill_from_bio(child_img_req,
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obj_req->img_extents,
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obj_req->num_img_extents,
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&obj_req->bio_pos);
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break;
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case OBJ_REQUEST_BVECS:
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ret = rbd_img_request_fill(child_img_req,
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OBJ_REQUEST_BVECS,
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&obj_req->bvec_pos);
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ret = __rbd_img_fill_from_bvecs(child_img_req,
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obj_req->img_extents,
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obj_req->num_img_extents,
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&obj_req->bvec_pos);
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break;
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default:
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rbd_assert(0);
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}
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} else {
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struct ceph_bvec_iter it = {
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.bvecs = obj_req->copyup_bvecs,
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.iter = { .bi_size = obj_req->img_extents[0].fe_len },
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};
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ret = rbd_img_request_fill(child_img_req, OBJ_REQUEST_BVECS,
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&it);
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ret = rbd_img_fill_from_bvecs(child_img_req,
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obj_req->img_extents,
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obj_req->num_img_extents,
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obj_req->copyup_bvecs);
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}
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if (ret) {
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rbd_img_request_put(child_img_req);
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@ -3520,15 +3670,10 @@ static void rbd_queue_workfn(struct work_struct *work)
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snapc = NULL; /* img_request consumes a ref */
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if (op_type == OBJ_OP_DISCARD)
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result = rbd_img_request_fill(img_request, OBJ_REQUEST_NODATA,
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NULL);
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else {
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struct ceph_bio_iter bio_it = { .bio = rq->bio,
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.iter = rq->bio->bi_iter };
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result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO,
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&bio_it);
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}
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result = rbd_img_fill_nodata(img_request, offset, length);
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else
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result = rbd_img_fill_from_bio(img_request, offset, length,
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rq->bio);
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if (result)
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goto err_img_request;
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