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Linux kernel mirror (for testing)
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linux
1/*
2 * Functions used by both the SCSI initiator code and the SCSI target code.
3 */
4
5#ifndef _SCSI_COMMON_H_
6#define _SCSI_COMMON_H_
7
8#include <linux/types.h>
9#include <scsi/scsi_proto.h>
10
11static inline unsigned
12scsi_varlen_cdb_length(const void *hdr)
13{
14 return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
15}
16
17extern const unsigned char scsi_command_size_tbl[8];
18#define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
19
20static inline unsigned
21scsi_command_size(const unsigned char *cmnd)
22{
23 return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
24 scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
25}
26
27/* Returns a human-readable name for the device */
28extern const char *scsi_device_type(unsigned type);
29
30extern void int_to_scsilun(u64, struct scsi_lun *);
31extern u64 scsilun_to_int(struct scsi_lun *);
32
33/*
34 * This is a slightly modified SCSI sense "descriptor" format header.
35 * The addition is to allow the 0x70 and 0x71 response codes. The idea
36 * is to place the salient data from either "fixed" or "descriptor" sense
37 * format into one structure to ease application processing.
38 *
39 * The original sense buffer should be kept around for those cases
40 * in which more information is required (e.g. the LBA of a MEDIUM ERROR).
41 */
42struct scsi_sense_hdr { /* See SPC-3 section 4.5 */
43 u8 response_code; /* permit: 0x0, 0x70, 0x71, 0x72, 0x73 */
44 u8 sense_key;
45 u8 asc;
46 u8 ascq;
47 u8 byte4;
48 u8 byte5;
49 u8 byte6;
50 u8 additional_length; /* always 0 for fixed sense format */
51};
52
53static inline bool scsi_sense_valid(const struct scsi_sense_hdr *sshdr)
54{
55 if (!sshdr)
56 return false;
57
58 return (sshdr->response_code & 0x70) == 0x70;
59}
60
61extern bool scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
62 struct scsi_sense_hdr *sshdr);
63
64extern void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq);
65int scsi_set_sense_information(u8 *buf, int buf_len, u64 info);
66extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
67 int desc_type);
68
69#endif /* _SCSI_COMMON_H_ */