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Linux/include/scsi/scsi_common.h

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  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 
 11 static inline unsigned
 12 scsi_varlen_cdb_length(const void *hdr)
 13 {
 14         return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
 15 }
 16 
 17 extern const unsigned char scsi_command_size_tbl[8];
 18 #define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
 19 
 20 static inline unsigned
 21 scsi_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 */
 28 extern const char *scsi_device_type(unsigned type);
 29 
 30 extern void int_to_scsilun(u64, struct scsi_lun *);
 31 extern 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  */
 42 struct 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 
 53 static 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 
 61 extern bool scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
 62                                  struct scsi_sense_hdr *sshdr);
 63 
 64 extern void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq);
 65 int scsi_set_sense_information(u8 *buf, int buf_len, u64 info);
 66 int scsi_set_sense_field_pointer(u8 *buf, int buf_len, u16 fp, u8 bp, bool cd);
 67 extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
 68                                        int desc_type);
 69 
 70 #endif /* _SCSI_COMMON_H_ */
 71 

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