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13#include <scsi/scsi_device.h>
14
15enum {
16 SCSI_DH_OK = 0,
17
18
19
20 SCSI_DH_DEV_FAILED,
21 SCSI_DH_DEV_TEMP_BUSY,
22 SCSI_DH_DEV_UNSUPP,
23 SCSI_DH_DEVICE_MAX,
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27
28 SCSI_DH_NOTCONN = SCSI_DH_DEVICE_MAX + 1,
29 SCSI_DH_CONN_FAILURE,
30 SCSI_DH_TRANSPORT_MAX,
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32
33
34
35 SCSI_DH_IO = SCSI_DH_TRANSPORT_MAX + 1,
36 SCSI_DH_INVALID_IO,
37 SCSI_DH_RETRY,
38 SCSI_DH_IMM_RETRY,
39 SCSI_DH_TIMED_OUT,
40 SCSI_DH_RES_TEMP_UNAVAIL,
41 SCSI_DH_DEV_OFFLINED,
42 SCSI_DH_NOMEM,
43 SCSI_DH_NOSYS,
44 SCSI_DH_DRIVER_MAX,
45};
46
47typedef void (*activate_complete)(void *, int);
48struct scsi_device_handler {
49
50 struct list_head list;
51
52
53 struct module *module;
54 const char *name;
55 enum scsi_disposition (*check_sense)(struct scsi_device *,
56 struct scsi_sense_hdr *);
57 int (*attach)(struct scsi_device *);
58 void (*detach)(struct scsi_device *);
59 int (*activate)(struct scsi_device *, activate_complete, void *);
60 blk_status_t (*prep_fn)(struct scsi_device *, struct request *);
61 int (*set_params)(struct scsi_device *, const char *);
62 void (*rescan)(struct scsi_device *);
63};
64
65#ifdef CONFIG_SCSI_DH
66extern int scsi_dh_activate(struct request_queue *, activate_complete, void *);
67extern int scsi_dh_attach(struct request_queue *, const char *);
68extern const char *scsi_dh_attached_handler_name(struct request_queue *, gfp_t);
69extern int scsi_dh_set_params(struct request_queue *, const char *);
70#else
71static inline int scsi_dh_activate(struct request_queue *req,
72 activate_complete fn, void *data)
73{
74 fn(data, 0);
75 return 0;
76}
77static inline int scsi_dh_attach(struct request_queue *req, const char *name)
78{
79 return SCSI_DH_NOSYS;
80}
81static inline const char *scsi_dh_attached_handler_name(struct request_queue *q,
82 gfp_t gfp)
83{
84 return NULL;
85}
86static inline int scsi_dh_set_params(struct request_queue *req, const char *params)
87{
88 return -SCSI_DH_NOSYS;
89}
90#endif
91