Hi all!
I have the next code of driver:
void my_end_request(struct bio* child, int error)
{
my_private_t* private = child->bi_private;
complete((struct completion*)private->completion);
}
int my_submit_request
(
my_handle_t* handle,
int rw,
int mode,
struct bio* bio,
void* user_private_data,
bio_end_io_t* user_callback
)
{
struct bio* child = NULL;
my_private_t* private = NULL;
my_registry_t* registry = NULL;
int direction = -1;
DECLARE_COMPLETION_ONSTACK(completion);
registry = handle->registry;
direction = bio_data_dir(bio);
child = bio_clone(bio, GFP_NOIO);
private = my_private_get(registry->my_cache_private); // here we get
a structure, that contains some of our data
child->bi_end_io = (bio_end_io_t*)my_end_request; // set the callback
child->bi_bdev = handle->bdev; // reading will be doing from this device
private->completion = &completion;
private->parent = bio;
private->user_private_data = user_private_data;
private->user_callback = user_callback;
private->mode = mode;
private->handle = handle;
child->bi_private = private;
generic_make_request(child);
wait_for_completion(&completion); // waiting to complete the reading
// yet another code
}
I'm trying to redirect requests (only read) to another device. In a
function my_submit_request I'm call the bio_clone and then
generic_make_request.
And also I'm call wait_for_completion (& completion) for waiting for
the reading. The callback function should work when the reading will
be completed.
The problem is, no callback call, and wait_for_completion does not
return control.
What am I doing wrong?
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