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rbd: get rid of obj_req->xferred, obj_req->result and img_req->xferred
obj_req->xferred and img_req->xferred don't bring any value. The former is used for short reads and has to be set to obj_req->ex.oe_len after that and elsewhere. The latter is just an aggregate. Use result for short reads (>=0 - number of bytes read, <0 - error) and pass it around explicitly. No need to store it in obj_req. Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Dongsheng Yang <dongsheng.yang@easystack.cn>
This commit is contained in:
Ilya Dryomov
parent
26350535c2
commit
54ab3b24c5
@ -276,9 +276,6 @@ struct rbd_obj_request {
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struct ceph_osd_request *osd_req;
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u64 xferred; /* bytes transferred */
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int result;
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struct kref kref;
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};
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@ -301,7 +298,6 @@ struct rbd_img_request {
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struct rbd_obj_request *obj_request; /* obj req initiator */
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};
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spinlock_t completion_lock;
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u64 xferred;/* aggregate bytes transferred */
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int result; /* first nonzero obj_request result */
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struct list_head object_extents; /* obj_req.ex structs */
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@ -584,6 +580,8 @@ static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id,
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static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id,
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u64 *snap_features);
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static void rbd_obj_handle_request(struct rbd_obj_request *obj_req, int result);
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static int rbd_open(struct block_device *bdev, fmode_t mode)
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{
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struct rbd_device *rbd_dev = bdev->bd_disk->private_data;
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@ -1317,6 +1315,8 @@ static void zero_bvecs(struct ceph_bvec_iter *bvec_pos, u32 off, u32 bytes)
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static void rbd_obj_zero_range(struct rbd_obj_request *obj_req, u32 off,
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u32 bytes)
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{
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dout("%s %p data buf %u~%u\n", __func__, obj_req, off, bytes);
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switch (obj_req->img_request->data_type) {
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case OBJ_REQUEST_BIO:
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zero_bios(&obj_req->bio_pos, off, bytes);
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@ -1457,28 +1457,26 @@ static bool rbd_img_is_write(struct rbd_img_request *img_req)
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}
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}
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static void rbd_obj_handle_request(struct rbd_obj_request *obj_req);
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static void rbd_osd_req_callback(struct ceph_osd_request *osd_req)
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{
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struct rbd_obj_request *obj_req = osd_req->r_priv;
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int result;
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dout("%s osd_req %p result %d for obj_req %p\n", __func__, osd_req,
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osd_req->r_result, obj_req);
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rbd_assert(osd_req == obj_req->osd_req);
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obj_req->result = osd_req->r_result < 0 ? osd_req->r_result : 0;
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if (!obj_req->result && !rbd_img_is_write(obj_req->img_request))
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obj_req->xferred = osd_req->r_result;
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/*
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* Writes aren't allowed to return a data payload. In some
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* guarded write cases (e.g. stat + zero on an empty object)
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* a stat response makes it through, but we don't care.
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*/
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if (osd_req->r_result > 0 && rbd_img_is_write(obj_req->img_request))
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result = 0;
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else
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/*
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* Writes aren't allowed to return a data payload. In some
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* guarded write cases (e.g. stat + zero on an empty object)
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* a stat response makes it through, but we don't care.
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*/
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obj_req->xferred = 0;
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result = osd_req->r_result;
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rbd_obj_handle_request(obj_req);
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rbd_obj_handle_request(obj_req, result);
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}
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static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request)
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@ -2041,7 +2039,6 @@ static int __rbd_img_fill_request(struct rbd_img_request *img_req)
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if (ret < 0)
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return ret;
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if (ret > 0) {
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img_req->xferred += obj_req->ex.oe_len;
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img_req->pending_count--;
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rbd_img_obj_request_del(img_req, obj_req);
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continue;
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@ -2400,17 +2397,17 @@ static int rbd_obj_read_from_parent(struct rbd_obj_request *obj_req)
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return 0;
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}
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static bool rbd_obj_handle_read(struct rbd_obj_request *obj_req)
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static bool rbd_obj_handle_read(struct rbd_obj_request *obj_req, int *result)
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{
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struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev;
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int ret;
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if (obj_req->result == -ENOENT &&
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if (*result == -ENOENT &&
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rbd_dev->parent_overlap && !obj_req->tried_parent) {
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/* reverse map this object extent onto the parent */
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ret = rbd_obj_calc_img_extents(obj_req, false);
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if (ret) {
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obj_req->result = ret;
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*result = ret;
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return true;
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}
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@ -2418,7 +2415,7 @@ static bool rbd_obj_handle_read(struct rbd_obj_request *obj_req)
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obj_req->tried_parent = true;
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ret = rbd_obj_read_from_parent(obj_req);
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if (ret) {
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obj_req->result = ret;
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*result = ret;
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return true;
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}
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return false;
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@ -2428,16 +2425,18 @@ static bool rbd_obj_handle_read(struct rbd_obj_request *obj_req)
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/*
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* -ENOENT means a hole in the image -- zero-fill the entire
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* length of the request. A short read also implies zero-fill
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* to the end of the request. In both cases we update xferred
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* count to indicate the whole request was satisfied.
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* to the end of the request.
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*/
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if (obj_req->result == -ENOENT ||
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(!obj_req->result && obj_req->xferred < obj_req->ex.oe_len)) {
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rbd_assert(!obj_req->xferred || !obj_req->result);
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rbd_obj_zero_range(obj_req, obj_req->xferred,
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obj_req->ex.oe_len - obj_req->xferred);
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obj_req->result = 0;
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obj_req->xferred = obj_req->ex.oe_len;
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if (*result == -ENOENT) {
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rbd_obj_zero_range(obj_req, 0, obj_req->ex.oe_len);
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*result = 0;
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} else if (*result >= 0) {
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if (*result < obj_req->ex.oe_len)
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rbd_obj_zero_range(obj_req, *result,
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obj_req->ex.oe_len - *result);
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else
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rbd_assert(*result == obj_req->ex.oe_len);
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*result = 0;
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}
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return true;
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@ -2635,14 +2634,13 @@ static int rbd_obj_handle_write_guard(struct rbd_obj_request *obj_req)
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return rbd_obj_read_from_parent(obj_req);
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}
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static bool rbd_obj_handle_write(struct rbd_obj_request *obj_req)
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static bool rbd_obj_handle_write(struct rbd_obj_request *obj_req, int *result)
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{
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int ret;
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switch (obj_req->write_state) {
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case RBD_OBJ_WRITE_GUARD:
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rbd_assert(!obj_req->xferred);
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if (obj_req->result == -ENOENT) {
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if (*result == -ENOENT) {
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/*
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* The target object doesn't exist. Read the data for
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* the entire target object up to the overlap point (if
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@ -2650,7 +2648,7 @@ static bool rbd_obj_handle_write(struct rbd_obj_request *obj_req)
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*/
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ret = rbd_obj_handle_write_guard(obj_req);
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if (ret) {
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obj_req->result = ret;
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*result = ret;
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return true;
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}
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return false;
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@ -2658,33 +2656,26 @@ static bool rbd_obj_handle_write(struct rbd_obj_request *obj_req)
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/* fall through */
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case RBD_OBJ_WRITE_FLAT:
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case RBD_OBJ_WRITE_COPYUP_OPS:
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if (!obj_req->result)
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/*
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* There is no such thing as a successful short
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* write -- indicate the whole request was satisfied.
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*/
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obj_req->xferred = obj_req->ex.oe_len;
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return true;
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case RBD_OBJ_WRITE_READ_FROM_PARENT:
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if (obj_req->result)
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if (*result < 0)
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return true;
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rbd_assert(obj_req->xferred);
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ret = rbd_obj_issue_copyup(obj_req, obj_req->xferred);
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rbd_assert(*result);
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ret = rbd_obj_issue_copyup(obj_req, *result);
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if (ret) {
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obj_req->result = ret;
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obj_req->xferred = 0;
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*result = ret;
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return true;
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}
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return false;
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case RBD_OBJ_WRITE_COPYUP_EMPTY_SNAPC:
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if (obj_req->result)
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if (*result)
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return true;
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obj_req->write_state = RBD_OBJ_WRITE_COPYUP_OPS;
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ret = rbd_obj_issue_copyup_ops(obj_req, MODS_ONLY);
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if (ret) {
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obj_req->result = ret;
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*result = ret;
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return true;
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}
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return false;
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@ -2696,24 +2687,23 @@ static bool rbd_obj_handle_write(struct rbd_obj_request *obj_req)
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/*
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* Returns true if @obj_req is completed, or false otherwise.
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*/
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static bool __rbd_obj_handle_request(struct rbd_obj_request *obj_req)
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static bool __rbd_obj_handle_request(struct rbd_obj_request *obj_req,
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int *result)
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{
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switch (obj_req->img_request->op_type) {
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case OBJ_OP_READ:
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return rbd_obj_handle_read(obj_req);
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return rbd_obj_handle_read(obj_req, result);
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case OBJ_OP_WRITE:
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return rbd_obj_handle_write(obj_req);
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return rbd_obj_handle_write(obj_req, result);
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case OBJ_OP_DISCARD:
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case OBJ_OP_ZEROOUT:
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if (rbd_obj_handle_write(obj_req)) {
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if (rbd_obj_handle_write(obj_req, result)) {
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/*
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* Hide -ENOENT from delete/truncate/zero -- discarding
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* a non-existent object is not a problem.
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*/
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if (obj_req->result == -ENOENT) {
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obj_req->result = 0;
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obj_req->xferred = obj_req->ex.oe_len;
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}
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if (*result == -ENOENT)
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*result = 0;
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return true;
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}
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return false;
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@ -2722,66 +2712,41 @@ static bool __rbd_obj_handle_request(struct rbd_obj_request *obj_req)
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}
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}
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static void rbd_obj_end_request(struct rbd_obj_request *obj_req)
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static void rbd_obj_end_request(struct rbd_obj_request *obj_req, int result)
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{
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struct rbd_img_request *img_req = obj_req->img_request;
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rbd_assert((!obj_req->result &&
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obj_req->xferred == obj_req->ex.oe_len) ||
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(obj_req->result < 0 && !obj_req->xferred));
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if (!obj_req->result) {
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img_req->xferred += obj_req->xferred;
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rbd_assert(result <= 0);
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if (!result)
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return;
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}
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rbd_warn(img_req->rbd_dev,
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"%s at objno %llu %llu~%llu result %d xferred %llu",
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rbd_warn(img_req->rbd_dev, "%s at objno %llu %llu~%llu result %d",
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obj_op_name(img_req->op_type), obj_req->ex.oe_objno,
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obj_req->ex.oe_off, obj_req->ex.oe_len, obj_req->result,
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obj_req->xferred);
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if (!img_req->result) {
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img_req->result = obj_req->result;
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img_req->xferred = 0;
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}
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}
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static void rbd_img_end_child_request(struct rbd_img_request *img_req)
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{
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struct rbd_obj_request *obj_req = img_req->obj_request;
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rbd_assert(test_bit(IMG_REQ_CHILD, &img_req->flags));
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rbd_assert((!img_req->result &&
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img_req->xferred == rbd_obj_img_extents_bytes(obj_req)) ||
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(img_req->result < 0 && !img_req->xferred));
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obj_req->result = img_req->result;
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obj_req->xferred = img_req->xferred;
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rbd_img_request_put(img_req);
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obj_req->ex.oe_off, obj_req->ex.oe_len, result);
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if (!img_req->result)
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img_req->result = result;
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}
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static void rbd_img_end_request(struct rbd_img_request *img_req)
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{
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rbd_assert(!test_bit(IMG_REQ_CHILD, &img_req->flags));
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rbd_assert((!img_req->result &&
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img_req->xferred == blk_rq_bytes(img_req->rq)) ||
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(img_req->result < 0 && !img_req->xferred));
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blk_mq_end_request(img_req->rq,
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errno_to_blk_status(img_req->result));
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rbd_img_request_put(img_req);
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}
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static void rbd_obj_handle_request(struct rbd_obj_request *obj_req)
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static void rbd_obj_handle_request(struct rbd_obj_request *obj_req, int result)
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{
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struct rbd_img_request *img_req;
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again:
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if (!__rbd_obj_handle_request(obj_req))
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if (!__rbd_obj_handle_request(obj_req, &result))
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return;
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img_req = obj_req->img_request;
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spin_lock(&img_req->completion_lock);
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rbd_obj_end_request(obj_req);
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rbd_obj_end_request(obj_req, result);
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rbd_assert(img_req->pending_count);
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if (--img_req->pending_count) {
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spin_unlock(&img_req->completion_lock);
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@ -2789,9 +2754,11 @@ again:
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}
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spin_unlock(&img_req->completion_lock);
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rbd_assert(img_req->result <= 0);
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if (test_bit(IMG_REQ_CHILD, &img_req->flags)) {
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obj_req = img_req->obj_request;
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rbd_img_end_child_request(img_req);
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result = img_req->result ?: rbd_obj_img_extents_bytes(obj_req);
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rbd_img_request_put(img_req);
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goto again;
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}
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rbd_img_end_request(img_req);
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