![Christoph Hellwig](/assets/img/avatar_default.png)
The current BSG design tries to shoe-horn the transport-specific passthrough commands into the overall framework for SCSI passthrough requests. This has a couple problems: - each passthrough queue has to set the QUEUE_FLAG_SCSI_PASSTHROUGH flag despite not dealing with SCSI commands at all. Because of that these queues could also incorrectly accept SCSI commands from in-kernel users or through the legacy SCSI_IOCTL_SEND_COMMAND ioctl. - the real SCSI bsg queues also incorrectly accept bsg requests of the BSG_SUB_PROTOCOL_SCSI_TRANSPORT type - the bsg transport code is almost unredable because it tries to reuse different SCSI concepts for its own purpose. This patch instead adds a new bsg_ops structure to handle the two cases differently, and thus solves all of the above problems. Another side effect is that the bsg-lib queues also don't need to embedd a struct scsi_request anymore. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_BSG_H
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#define _LINUX_BSG_H
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#include <uapi/linux/bsg.h>
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struct request;
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#ifdef CONFIG_BLK_DEV_BSG
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struct bsg_ops {
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int (*check_proto)(struct sg_io_v4 *hdr);
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int (*fill_hdr)(struct request *rq, struct sg_io_v4 *hdr,
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fmode_t mode);
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int (*complete_rq)(struct request *rq, struct sg_io_v4 *hdr);
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void (*free_rq)(struct request *rq);
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};
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struct bsg_class_device {
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struct device *class_dev;
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struct device *parent;
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int minor;
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struct request_queue *queue;
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struct kref ref;
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const struct bsg_ops *ops;
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void (*release)(struct device *);
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};
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int bsg_register_queue(struct request_queue *q, struct device *parent,
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const char *name, const struct bsg_ops *ops,
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void (*release)(struct device *));
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int bsg_scsi_register_queue(struct request_queue *q, struct device *parent);
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void bsg_unregister_queue(struct request_queue *q);
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#else
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static inline int bsg_scsi_register_queue(struct request_queue *q,
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struct device *parent)
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{
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return 0;
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}
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static inline void bsg_unregister_queue(struct request_queue *q)
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{
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}
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#endif /* CONFIG_BLK_DEV_BSG */
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#endif /* _LINUX_BSG_H */
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