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bsg-lib.h
/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * BSG helper library * * Copyright (C) 2008 James Smart, Emulex Corporation * Copyright (C) 2011 Red Hat, Inc. All rights reserved. * Copyright (C) 2011 Mike Christie */ #ifndef _BLK_BSG_ #define _BLK_BSG_ #include <linux/blkdev.h> #include <scsi/scsi_request.h> struct bsg_job; struct request; struct device; struct scatterlist; struct request_queue; typedef int (bsg_job_fn) (struct bsg_job *); typedef enum blk_eh_timer_return (bsg_timeout_fn)(struct request *); struct bsg_buffer { unsigned int payload_len; int sg_cnt; struct scatterlist *sg_list; }; struct bsg_job { struct device *dev; struct kref kref; unsigned int timeout; /* Transport/driver specific request/reply structs */ void *request; void *reply; unsigned int request_len; unsigned int reply_len; /* * On entry : reply_len indicates the buffer size allocated for * the reply. * * Upon completion : the message handler must set reply_len * to indicates the size of the reply to be returned to the * caller. */ /* DMA payloads for the request/response */ struct bsg_buffer request_payload; struct bsg_buffer reply_payload; int result; unsigned int reply_payload_rcv_len; /* BIDI support */ struct request *bidi_rq; struct bio *bidi_bio; void *dd_data; /* Used for driver-specific storage */ }; void bsg_job_done(struct bsg_job *job, int result, unsigned int reply_payload_rcv_len); struct request_queue *bsg_setup_queue(struct device *dev, const char *name, bsg_job_fn *job_fn, bsg_timeout_fn *timeout, int dd_job_size); void bsg_remove_queue(struct request_queue *q); void bsg_job_put(struct bsg_job *job); int __must_check bsg_job_get(struct bsg_job *job); #endif