diff options
Diffstat (limited to 'drivers/block/rbd.c')
| -rw-r--r-- | drivers/block/rbd.c | 52 |
1 files changed, 24 insertions, 28 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 22085e86a409..6c81a4c040b9 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -196,7 +196,7 @@ struct rbd_obj_request { u64 xferred; /* bytes transferred */ u64 version; - s32 result; + int result; atomic_t done; rbd_obj_callback_t callback; @@ -1282,12 +1282,19 @@ static void rbd_osd_trivial_callback(struct rbd_obj_request *obj_request) static void rbd_osd_read_callback(struct rbd_obj_request *obj_request) { - dout("%s: obj %p result %d %llu/%llu\n", __func__, obj_request, obj_request->result, obj_request->xferred, obj_request->length); - if (obj_request->result == (s32) -ENOENT) { + /* + * ENOENT means a hole in the object. We zero-fill the + * entire length of the request. A short read also implies + * zero-fill to the end of the request. Either way we + * update the xferred count to indicate the whole request + * was satisfied. + */ + if (obj_request->result == -ENOENT) { zero_bio_chain(obj_request->bio_list, 0); obj_request->result = 0; + obj_request->xferred = obj_request->length; } else if (obj_request->xferred < obj_request->length && !obj_request->result) { zero_bio_chain(obj_request->bio_list, obj_request->xferred); @@ -1298,20 +1305,14 @@ static void rbd_osd_read_callback(struct rbd_obj_request *obj_request) static void rbd_osd_write_callback(struct rbd_obj_request *obj_request) { - dout("%s: obj %p result %d %llu/%llu\n", __func__, obj_request, - obj_request->result, obj_request->xferred, obj_request->length); - - /* A short write really shouldn't occur. Warn if we see one */ - - if (obj_request->xferred != obj_request->length) { - struct rbd_img_request *img_request = obj_request->img_request; - struct rbd_device *rbd_dev; - - rbd_dev = img_request ? img_request->rbd_dev : NULL; - rbd_warn(rbd_dev, "wrote %llu want %llu\n", - obj_request->xferred, obj_request->length); - } - + dout("%s: obj %p result %d %llu\n", __func__, obj_request, + obj_request->result, obj_request->length); + /* + * There is no such thing as a successful short write. + * Our xferred value is the number of bytes transferred + * back. Set it to our originally-requested length. + */ + obj_request->xferred = obj_request->length; obj_request_done_set(obj_request); } @@ -1329,9 +1330,6 @@ static void rbd_osd_req_callback(struct ceph_osd_request *osd_req, struct ceph_msg *msg) { struct rbd_obj_request *obj_request = osd_req->r_priv; - struct ceph_osd_reply_head *reply_head; - struct ceph_osd_op *op; - u32 num_ops; u16 opcode; dout("%s: osd_req %p msg %p\n", __func__, osd_req, msg); @@ -1339,22 +1337,19 @@ static void rbd_osd_req_callback(struct ceph_osd_request *osd_req, rbd_assert(!!obj_request->img_request ^ (obj_request->which == BAD_WHICH)); - reply_head = msg->front.iov_base; - obj_request->result = (s32) le32_to_cpu(reply_head->result); + if (osd_req->r_result < 0) + obj_request->result = osd_req->r_result; obj_request->version = le64_to_cpu(osd_req->r_reassert_version.version); - num_ops = le32_to_cpu(reply_head->num_ops); - WARN_ON(num_ops != 1); /* For now */ + WARN_ON(osd_req->r_num_ops != 1); /* For now */ /* * We support a 64-bit length, but ultimately it has to be * passed to blk_end_request(), which takes an unsigned int. */ - op = &reply_head->ops[0]; - obj_request->xferred = le64_to_cpu(op->extent.length); + obj_request->xferred = osd_req->r_reply_op_len[0]; rbd_assert(obj_request->xferred < (u64) UINT_MAX); - - opcode = le16_to_cpu(op->op); + opcode = osd_req->r_request_ops[0].op; switch (opcode) { case CEPH_OSD_OP_READ: rbd_osd_read_callback(obj_request); @@ -1719,6 +1714,7 @@ static void rbd_img_obj_callback(struct rbd_obj_request *obj_request) more = blk_end_request(img_request->rq, result, xferred); which++; } + rbd_assert(more ^ (which == img_request->obj_request_count)); img_request->next_completion = which; out: |