get_request (9) Linux Manual Page
get_request – get a free request
Synopsis
struct request *get_request(struct request_queue *q, int op, int op_flags, struct bio *bio, gfp_t gfp_mask);Arguments
q
-
- request_queue to allocate request from
op
- REQ_OP_READ/REQ_OP_WRITE
op_flags
- rq_flag_bits
bio
- bio to allocate request for (can be
NULL)
gfp_mask
- allocation mask
Description
Get a free request from q. If __GFP_DIRECT_RECLAIM 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*.