rbd: define an rbd object request flags field
We're going to need some more Boolean values for object requests, so create a flags bit field and use it to record whether the request is done. Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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@ -170,10 +170,15 @@ enum obj_request_type {
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OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES
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};
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enum obj_req_flags {
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OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */
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};
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struct rbd_obj_request {
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const char *object_name;
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u64 offset; /* object start byte */
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u64 length; /* bytes from offset */
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unsigned long flags;
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struct rbd_img_request *img_request;
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u64 img_offset; /* image relative offset */
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@ -194,7 +199,6 @@ struct rbd_obj_request {
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u64 xferred; /* bytes transferred */
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u64 version;
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int result;
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atomic_t done;
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rbd_obj_callback_t callback;
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struct completion completion;
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@ -1072,6 +1076,29 @@ out_err:
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return NULL;
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}
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/*
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* The default/initial value for all object request flags is 0. For
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* each flag, once its value is set to 1 it is never reset to 0
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* again.
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*/
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static void obj_request_done_set(struct rbd_obj_request *obj_request)
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{
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if (test_and_set_bit(OBJ_REQ_DONE, &obj_request->flags)) {
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struct rbd_img_request *img_request = obj_request->img_request;
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struct rbd_device *rbd_dev;
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rbd_dev = img_request ? img_request->rbd_dev : NULL;
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rbd_warn(rbd_dev, "obj_request %p already marked done\n",
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obj_request);
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}
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}
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static bool obj_request_done_test(struct rbd_obj_request *obj_request)
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{
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smp_mb();
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return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0;
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}
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static void rbd_obj_request_get(struct rbd_obj_request *obj_request)
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{
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dout("%s: obj %p (was %d)\n", __func__, obj_request,
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@ -1192,33 +1219,6 @@ static int rbd_obj_request_wait(struct rbd_obj_request *obj_request)
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return wait_for_completion_interruptible(&obj_request->completion);
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}
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static void obj_request_done_init(struct rbd_obj_request *obj_request)
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{
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atomic_set(&obj_request->done, 0);
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smp_wmb();
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}
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static void obj_request_done_set(struct rbd_obj_request *obj_request)
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{
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int done;
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done = atomic_inc_return(&obj_request->done);
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if (done > 1) {
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struct rbd_img_request *img_request = obj_request->img_request;
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struct rbd_device *rbd_dev;
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rbd_dev = img_request ? img_request->rbd_dev : NULL;
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rbd_warn(rbd_dev, "obj_request %p was already done\n",
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obj_request);
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}
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}
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static bool obj_request_done_test(struct rbd_obj_request *obj_request)
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{
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smp_mb();
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return atomic_read(&obj_request->done) != 0;
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}
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/*
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* The default/initial value for all image request flags is 0. Each
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* is conditionally set to 1 at image request initialization time
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@ -1475,10 +1475,10 @@ static struct rbd_obj_request *rbd_obj_request_create(const char *object_name,
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obj_request->object_name = memcpy(name, object_name, size);
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obj_request->offset = offset;
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obj_request->length = length;
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obj_request->flags = 0;
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obj_request->which = BAD_WHICH;
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obj_request->type = type;
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INIT_LIST_HEAD(&obj_request->links);
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obj_request_done_init(obj_request);
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init_completion(&obj_request->completion);
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kref_init(&obj_request->kref);
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