get_request — get a free request
struct request * get_request ( | struct request_queue * q, |
| int rw_flags, | |
| struct bio * bio, | |
unsigned int flags); |
qrequest_queue to allocate request from
rw_flagsRW and SYNC flags
bio
bio to allocate request for (can be NULL)
flagsBLQ_MQ_REQ_* flags.
Get a free request from q. If __GFP_WAIT is set in gfp_mask, this
function keeps retrying under memory pressure and fails iff q is dead.
Must be called with q->queue_lock held and,
Returns ERR_PTR on failure, with q->queue_lock held.
Returns request pointer on success, with q->queue_lock *not held*.