1 /*
2 * This header file contains public constants and structures used by
3 * the scsi code for linux.
4 *
5 * For documentation on the OPCODES, MESSAGES, and SENSE values,
6 * please consult the SCSI standard.
7 */
8 #ifndef _SCSI_SCSI_H
9 #define _SCSI_SCSI_H
10
11 #include <linux/types.h>
12 #include <linux/scatterlist.h>
13
14 struct scsi_cmnd;
15
16 /*
17 * The maximum number of SG segments that we will put inside a
18 * scatterlist (unless chaining is used). Should ideally fit inside a
19 * single page, to avoid a higher order allocation. We could define this
20 * to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order. The
21 * minimum value is 32
22 */
23 #define SCSI_MAX_SG_SEGMENTS 128
24
25 /*
26 * Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit
27 * is totally arbitrary, a setting of 2048 will get you at least 8mb ios.
28 */
29 #ifdef ARCH_HAS_SG_CHAIN
30 #define SCSI_MAX_SG_CHAIN_SEGMENTS 2048
31 #else
32 #define SCSI_MAX_SG_CHAIN_SEGMENTS SCSI_MAX_SG_SEGMENTS
33 #endif
34
35 /*
36 * DIX-capable adapters effectively support infinite chaining for the
37 * protection information scatterlist
38 */
39 #define SCSI_MAX_PROT_SG_SEGMENTS 0xFFFF
40
41 /*
42 * Special value for scanning to specify scanning or rescanning of all
43 * possible channels, (target) ids, or luns on a given shost.
44 */
45 #define SCAN_WILD_CARD ~0
46
47 /*
48 * SCSI opcodes
49 */
50
51 #define TEST_UNIT_READY 0x00
52 #define REZERO_UNIT 0x01
53 #define REQUEST_SENSE 0x03
54 #define FORMAT_UNIT 0x04
55 #define READ_BLOCK_LIMITS 0x05
56 #define REASSIGN_BLOCKS 0x07
57 #define INITIALIZE_ELEMENT_STATUS 0x07
58 #define READ_6 0x08
59 #define WRITE_6 0x0a
60 #define SEEK_6 0x0b
61 #define READ_REVERSE 0x0f
62 #define WRITE_FILEMARKS 0x10
63 #define SPACE 0x11
64 #define INQUIRY 0x12
65 #define RECOVER_BUFFERED_DATA 0x14
66 #define MODE_SELECT 0x15
67 #define RESERVE 0x16
68 #define RELEASE 0x17
69 #define COPY 0x18
70 #define ERASE 0x19
71 #define MODE_SENSE 0x1a
72 #define START_STOP 0x1b
73 #define RECEIVE_DIAGNOSTIC 0x1c
74 #define SEND_DIAGNOSTIC 0x1d
75 #define ALLOW_MEDIUM_REMOVAL 0x1e
76
77 #define READ_FORMAT_CAPACITIES 0x23
78 #define SET_WINDOW 0x24
79 #define READ_CAPACITY 0x25
80 #define READ_10 0x28
81 #define WRITE_10 0x2a
82 #define SEEK_10 0x2b
83 #define POSITION_TO_ELEMENT 0x2b
84 #define WRITE_VERIFY 0x2e
85 #define VERIFY 0x2f
86 #define SEARCH_HIGH 0x30
87 #define SEARCH_EQUAL 0x31
88 #define SEARCH_LOW 0x32
89 #define SET_LIMITS 0x33
90 #define PRE_FETCH 0x34
91 #define READ_POSITION 0x34
92 #define SYNCHRONIZE_CACHE 0x35
93 #define LOCK_UNLOCK_CACHE 0x36
94 #define READ_DEFECT_DATA 0x37
95 #define MEDIUM_SCAN 0x38
96 #define COMPARE 0x39
97 #define COPY_VERIFY 0x3a
98 #define WRITE_BUFFER 0x3b
99 #define READ_BUFFER 0x3c
100 #define UPDATE_BLOCK 0x3d
101 #define READ_LONG 0x3e
102 #define WRITE_LONG 0x3f
103 #define CHANGE_DEFINITION 0x40
104 #define WRITE_SAME 0x41
105 #define UNMAP 0x42
106 #define READ_TOC 0x43
107 #define READ_HEADER 0x44
108 #define GET_EVENT_STATUS_NOTIFICATION 0x4a
109 #define LOG_SELECT 0x4c
110 #define LOG_SENSE 0x4d
111 #define XDWRITEREAD_10 0x53
112 #define MODE_SELECT_10 0x55
113 #define RESERVE_10 0x56
114 #define RELEASE_10 0x57
115 #define MODE_SENSE_10 0x5a
116 #define PERSISTENT_RESERVE_IN 0x5e
117 #define PERSISTENT_RESERVE_OUT 0x5f
118 #define VARIABLE_LENGTH_CMD 0x7f
119 #define REPORT_LUNS 0xa0
120 #define SECURITY_PROTOCOL_IN 0xa2
121 #define MAINTENANCE_IN 0xa3
122 #define MAINTENANCE_OUT 0xa4
123 #define MOVE_MEDIUM 0xa5
124 #define EXCHANGE_MEDIUM 0xa6
125 #define READ_12 0xa8
126 #define WRITE_12 0xaa
127 #define READ_MEDIA_SERIAL_NUMBER 0xab
128 #define WRITE_VERIFY_12 0xae
129 #define VERIFY_12 0xaf
130 #define SEARCH_HIGH_12 0xb0
131 #define SEARCH_EQUAL_12 0xb1
132 #define SEARCH_LOW_12 0xb2
133 #define SECURITY_PROTOCOL_OUT 0xb5
134 #define READ_ELEMENT_STATUS 0xb8
135 #define SEND_VOLUME_TAG 0xb6
136 #define WRITE_LONG_2 0xea
137 #define EXTENDED_COPY 0x83
138 #define RECEIVE_COPY_RESULTS 0x84
139 #define ACCESS_CONTROL_IN 0x86
140 #define ACCESS_CONTROL_OUT 0x87
141 #define READ_16 0x88
142 #define WRITE_16 0x8a
143 #define READ_ATTRIBUTE 0x8c
144 #define WRITE_ATTRIBUTE 0x8d
145 #define VERIFY_16 0x8f
146 #define SYNCHRONIZE_CACHE_16 0x91
147 #define WRITE_SAME_16 0x93
148 #define SERVICE_ACTION_IN 0x9e
149 /* values for service action in */
150 #define SAI_READ_CAPACITY_16 0x10
151 #define SAI_GET_LBA_STATUS 0x12
152 /* values for VARIABLE_LENGTH_CMD service action codes
153 * see spc4r17 Section D.3.5, table D.7 and D.8 */
154 #define VLC_SA_RECEIVE_CREDENTIAL 0x1800
155 /* values for maintenance in */
156 #define MI_REPORT_IDENTIFYING_INFORMATION 0x05
157 #define MI_REPORT_TARGET_PGS 0x0a
158 #define MI_REPORT_ALIASES 0x0b
159 #define MI_REPORT_SUPPORTED_OPERATION_CODES 0x0c
160 #define MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS 0x0d
161 #define MI_REPORT_PRIORITY 0x0e
162 #define MI_REPORT_TIMESTAMP 0x0f
163 #define MI_MANAGEMENT_PROTOCOL_IN 0x10
164 /* values for maintenance out */
165 #define MO_SET_IDENTIFYING_INFORMATION 0x06
166 #define MO_SET_TARGET_PGS 0x0a
167 #define MO_CHANGE_ALIASES 0x0b
168 #define MO_SET_PRIORITY 0x0e
169 #define MO_SET_TIMESTAMP 0x0f
170 #define MO_MANAGEMENT_PROTOCOL_OUT 0x10
171 /* values for variable length command */
172 #define XDREAD_32 0x03
173 #define XDWRITE_32 0x04
174 #define XPWRITE_32 0x06
175 #define XDWRITEREAD_32 0x07
176 #define READ_32 0x09
177 #define VERIFY_32 0x0a
178 #define WRITE_32 0x0b
179 #define WRITE_SAME_32 0x0d
180
181 /* Values for T10/04-262r7 */
182 #define ATA_16 0x85 /* 16-byte pass-thru */
183 #define ATA_12 0xa1 /* 12-byte pass-thru */
184
185 /*
186 * SCSI command lengths
187 */
188
189 #define SCSI_MAX_VARLEN_CDB_SIZE 260
190
191 /* defined in T10 SCSI Primary Commands-2 (SPC2) */
192 struct scsi_varlen_cdb_hdr {
193 __u8 opcode; /* opcode always == VARIABLE_LENGTH_CMD */
194 __u8 control;
195 __u8 misc[5];
196 __u8 additional_cdb_length; /* total cdb length - 8 */
197 __be16 service_action;
198 /* service specific data follows */
199 };
200
201 static inline unsigned
scsi_varlen_cdb_length(const void * hdr)202 scsi_varlen_cdb_length(const void *hdr)
203 {
204 return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
205 }
206
207 extern const unsigned char scsi_command_size_tbl[8];
208 #define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
209
210 static inline unsigned
scsi_command_size(const unsigned char * cmnd)211 scsi_command_size(const unsigned char *cmnd)
212 {
213 return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
214 scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
215 }
216
217 /*
218 * SCSI Architecture Model (SAM) Status codes. Taken from SAM-3 draft
219 * T10/1561-D Revision 4 Draft dated 7th November 2002.
220 */
221 #define SAM_STAT_GOOD 0x00
222 #define SAM_STAT_CHECK_CONDITION 0x02
223 #define SAM_STAT_CONDITION_MET 0x04
224 #define SAM_STAT_BUSY 0x08
225 #define SAM_STAT_INTERMEDIATE 0x10
226 #define SAM_STAT_INTERMEDIATE_CONDITION_MET 0x14
227 #define SAM_STAT_RESERVATION_CONFLICT 0x18
228 #define SAM_STAT_COMMAND_TERMINATED 0x22 /* obsolete in SAM-3 */
229 #define SAM_STAT_TASK_SET_FULL 0x28
230 #define SAM_STAT_ACA_ACTIVE 0x30
231 #define SAM_STAT_TASK_ABORTED 0x40
232
233 /** scsi_status_is_good - check the status return.
234 *
235 * @status: the status passed up from the driver (including host and
236 * driver components)
237 *
238 * This returns true for known good conditions that may be treated as
239 * command completed normally
240 */
scsi_status_is_good(int status)241 static inline int scsi_status_is_good(int status)
242 {
243 /*
244 * FIXME: bit0 is listed as reserved in SCSI-2, but is
245 * significant in SCSI-3. For now, we follow the SCSI-2
246 * behaviour and ignore reserved bits.
247 */
248 status &= 0xfe;
249 return ((status == SAM_STAT_GOOD) ||
250 (status == SAM_STAT_INTERMEDIATE) ||
251 (status == SAM_STAT_INTERMEDIATE_CONDITION_MET) ||
252 /* FIXME: this is obsolete in SAM-3 */
253 (status == SAM_STAT_COMMAND_TERMINATED));
254 }
255
256 /*
257 * Status codes. These are deprecated as they are shifted 1 bit right
258 * from those found in the SCSI standards. This causes confusion for
259 * applications that are ported to several OSes. Prefer SAM Status codes
260 * above.
261 */
262
263 #define GOOD 0x00
264 #define CHECK_CONDITION 0x01
265 #define CONDITION_GOOD 0x02
266 #define BUSY 0x04
267 #define INTERMEDIATE_GOOD 0x08
268 #define INTERMEDIATE_C_GOOD 0x0a
269 #define RESERVATION_CONFLICT 0x0c
270 #define COMMAND_TERMINATED 0x11
271 #define QUEUE_FULL 0x14
272 #define ACA_ACTIVE 0x18
273 #define TASK_ABORTED 0x20
274
275 #define STATUS_MASK 0xfe
276
277 /*
278 * SENSE KEYS
279 */
280
281 #define NO_SENSE 0x00
282 #define RECOVERED_ERROR 0x01
283 #define NOT_READY 0x02
284 #define MEDIUM_ERROR 0x03
285 #define HARDWARE_ERROR 0x04
286 #define ILLEGAL_REQUEST 0x05
287 #define UNIT_ATTENTION 0x06
288 #define DATA_PROTECT 0x07
289 #define BLANK_CHECK 0x08
290 #define COPY_ABORTED 0x0a
291 #define ABORTED_COMMAND 0x0b
292 #define VOLUME_OVERFLOW 0x0d
293 #define MISCOMPARE 0x0e
294
295
296 /*
297 * DEVICE TYPES
298 * Please keep them in 0x%02x format for $MODALIAS to work
299 */
300
301 #define TYPE_DISK 0x00
302 #define TYPE_TAPE 0x01
303 #define TYPE_PRINTER 0x02
304 #define TYPE_PROCESSOR 0x03 /* HP scanners use this */
305 #define TYPE_WORM 0x04 /* Treated as ROM by our system */
306 #define TYPE_ROM 0x05
307 #define TYPE_SCANNER 0x06
308 #define TYPE_MOD 0x07 /* Magneto-optical disk -
309 * - treated as TYPE_DISK */
310 #define TYPE_MEDIUM_CHANGER 0x08
311 #define TYPE_COMM 0x09 /* Communications device */
312 #define TYPE_RAID 0x0c
313 #define TYPE_ENCLOSURE 0x0d /* Enclosure Services Device */
314 #define TYPE_RBC 0x0e
315 #define TYPE_OSD 0x11
316 #define TYPE_NO_LUN 0x7f
317
318 /* SCSI protocols; these are taken from SPC-3 section 7.5 */
319 enum scsi_protocol {
320 SCSI_PROTOCOL_FCP = 0, /* Fibre Channel */
321 SCSI_PROTOCOL_SPI = 1, /* parallel SCSI */
322 SCSI_PROTOCOL_SSA = 2, /* Serial Storage Architecture - Obsolete */
323 SCSI_PROTOCOL_SBP = 3, /* firewire */
324 SCSI_PROTOCOL_SRP = 4, /* Infiniband RDMA */
325 SCSI_PROTOCOL_ISCSI = 5,
326 SCSI_PROTOCOL_SAS = 6,
327 SCSI_PROTOCOL_ADT = 7, /* Media Changers */
328 SCSI_PROTOCOL_ATA = 8,
329 SCSI_PROTOCOL_UNSPEC = 0xf, /* No specific protocol */
330 };
331
332 /* Returns a human-readable name for the device */
333 extern const char * scsi_device_type(unsigned type);
334
335 /*
336 * standard mode-select header prepended to all mode-select commands
337 */
338
339 struct ccs_modesel_head {
340 __u8 _r1; /* reserved */
341 __u8 medium; /* device-specific medium type */
342 __u8 _r2; /* reserved */
343 __u8 block_desc_length; /* block descriptor length */
344 __u8 density; /* device-specific density code */
345 __u8 number_blocks_hi; /* number of blocks in this block desc */
346 __u8 number_blocks_med;
347 __u8 number_blocks_lo;
348 __u8 _r3;
349 __u8 block_length_hi; /* block length for blocks in this desc */
350 __u8 block_length_med;
351 __u8 block_length_lo;
352 };
353
354 /*
355 * ScsiLun: 8 byte LUN.
356 */
357 struct scsi_lun {
358 __u8 scsi_lun[8];
359 };
360
361 /*
362 * The Well Known LUNS (SAM-3) in our int representation of a LUN
363 */
364 #define SCSI_W_LUN_BASE 0xc100
365 #define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
366 #define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
367 #define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)
368
scsi_is_wlun(unsigned int lun)369 static inline int scsi_is_wlun(unsigned int lun)
370 {
371 return (lun & 0xff00) == SCSI_W_LUN_BASE;
372 }
373
374
375 /*
376 * MESSAGE CODES
377 */
378
379 #define COMMAND_COMPLETE 0x00
380 #define EXTENDED_MESSAGE 0x01
381 #define EXTENDED_MODIFY_DATA_POINTER 0x00
382 #define EXTENDED_SDTR 0x01
383 #define EXTENDED_EXTENDED_IDENTIFY 0x02 /* SCSI-I only */
384 #define EXTENDED_WDTR 0x03
385 #define EXTENDED_PPR 0x04
386 #define EXTENDED_MODIFY_BIDI_DATA_PTR 0x05
387 #define SAVE_POINTERS 0x02
388 #define RESTORE_POINTERS 0x03
389 #define DISCONNECT 0x04
390 #define INITIATOR_ERROR 0x05
391 #define ABORT_TASK_SET 0x06
392 #define MESSAGE_REJECT 0x07
393 #define NOP 0x08
394 #define MSG_PARITY_ERROR 0x09
395 #define LINKED_CMD_COMPLETE 0x0a
396 #define LINKED_FLG_CMD_COMPLETE 0x0b
397 #define TARGET_RESET 0x0c
398 #define ABORT_TASK 0x0d
399 #define CLEAR_TASK_SET 0x0e
400 #define INITIATE_RECOVERY 0x0f /* SCSI-II only */
401 #define RELEASE_RECOVERY 0x10 /* SCSI-II only */
402 #define CLEAR_ACA 0x16
403 #define LOGICAL_UNIT_RESET 0x17
404 #define SIMPLE_QUEUE_TAG 0x20
405 #define HEAD_OF_QUEUE_TAG 0x21
406 #define ORDERED_QUEUE_TAG 0x22
407 #define IGNORE_WIDE_RESIDUE 0x23
408 #define ACA 0x24
409 #define QAS_REQUEST 0x55
410
411 /* Old SCSI2 names, don't use in new code */
412 #define BUS_DEVICE_RESET TARGET_RESET
413 #define ABORT ABORT_TASK_SET
414
415 /*
416 * Host byte codes
417 */
418
419 #define DID_OK 0x00 /* NO error */
420 #define DID_NO_CONNECT 0x01 /* Couldn't connect before timeout period */
421 #define DID_BUS_BUSY 0x02 /* BUS stayed busy through time out period */
422 #define DID_TIME_OUT 0x03 /* TIMED OUT for other reason */
423 #define DID_BAD_TARGET 0x04 /* BAD target. */
424 #define DID_ABORT 0x05 /* Told to abort for some other reason */
425 #define DID_PARITY 0x06 /* Parity error */
426 #define DID_ERROR 0x07 /* Internal error */
427 #define DID_RESET 0x08 /* Reset by somebody. */
428 #define DID_BAD_INTR 0x09 /* Got an interrupt we weren't expecting. */
429 #define DID_PASSTHROUGH 0x0a /* Force command past mid-layer */
430 #define DID_SOFT_ERROR 0x0b /* The low level driver just wish a retry */
431 #define DID_IMM_RETRY 0x0c /* Retry without decrementing retry count */
432 #define DID_REQUEUE 0x0d /* Requeue command (no immediate retry) also
433 * without decrementing the retry count */
434 #define DID_TRANSPORT_DISRUPTED 0x0e /* Transport error disrupted execution
435 * and the driver blocked the port to
436 * recover the link. Transport class will
437 * retry or fail IO */
438 #define DID_TRANSPORT_FAILFAST 0x0f /* Transport class fastfailed the io */
439 #define DID_TARGET_FAILURE 0x10 /* Permanent target failure, do not retry on
440 * other paths */
441 #define DID_NEXUS_FAILURE 0x11 /* Permanent nexus failure, retry on other
442 * paths might yield different results */
443 #define DRIVER_OK 0x00 /* Driver status */
444
445 /*
446 * These indicate the error that occurred, and what is available.
447 */
448
449 #define DRIVER_BUSY 0x01
450 #define DRIVER_SOFT 0x02
451 #define DRIVER_MEDIA 0x03
452 #define DRIVER_ERROR 0x04
453
454 #define DRIVER_INVALID 0x05
455 #define DRIVER_TIMEOUT 0x06
456 #define DRIVER_HARD 0x07
457 #define DRIVER_SENSE 0x08
458
459 /*
460 * Internal return values.
461 */
462
463 #define NEEDS_RETRY 0x2001
464 #define SUCCESS 0x2002
465 #define FAILED 0x2003
466 #define QUEUED 0x2004
467 #define SOFT_ERROR 0x2005
468 #define ADD_TO_MLQUEUE 0x2006
469 #define TIMEOUT_ERROR 0x2007
470 #define SCSI_RETURN_NOT_HANDLED 0x2008
471 #define FAST_IO_FAIL 0x2009
472 #define TARGET_ERROR 0x200A
473
474 /*
475 * Midlevel queue return values.
476 */
477 #define SCSI_MLQUEUE_HOST_BUSY 0x1055
478 #define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
479 #define SCSI_MLQUEUE_EH_RETRY 0x1057
480 #define SCSI_MLQUEUE_TARGET_BUSY 0x1058
481
482 /*
483 * Use these to separate status msg and our bytes
484 *
485 * These are set by:
486 *
487 * status byte = set from target device
488 * msg_byte = return status from host adapter itself.
489 * host_byte = set by low-level driver to indicate status.
490 * driver_byte = set by mid-level.
491 */
492 #define status_byte(result) (((result) >> 1) & 0x7f)
493 #define msg_byte(result) (((result) >> 8) & 0xff)
494 #define host_byte(result) (((result) >> 16) & 0xff)
495 #define driver_byte(result) (((result) >> 24) & 0xff)
496
497 #define sense_class(sense) (((sense) >> 4) & 0x7)
498 #define sense_error(sense) ((sense) & 0xf)
499 #define sense_valid(sense) ((sense) & 0x80)
500
501 /*
502 * default timeouts
503 */
504 #define FORMAT_UNIT_TIMEOUT (2 * 60 * 60 * HZ)
505 #define START_STOP_TIMEOUT (60 * HZ)
506 #define MOVE_MEDIUM_TIMEOUT (5 * 60 * HZ)
507 #define READ_ELEMENT_STATUS_TIMEOUT (5 * 60 * HZ)
508 #define READ_DEFECT_DATA_TIMEOUT (60 * HZ )
509
510
511 #define IDENTIFY_BASE 0x80
512 #define IDENTIFY(can_disconnect, lun) (IDENTIFY_BASE |\
513 ((can_disconnect) ? 0x40 : 0) |\
514 ((lun) & 0x07))
515
516 /*
517 * struct scsi_device::scsi_level values. For SCSI devices other than those
518 * prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
519 * where "resp" is a byte array of the response to an INQUIRY. The scsi_level
520 * variable is visible to the user via sysfs.
521 */
522
523 #define SCSI_UNKNOWN 0
524 #define SCSI_1 1
525 #define SCSI_1_CCS 2
526 #define SCSI_2 3
527 #define SCSI_3 4 /* SPC */
528 #define SCSI_SPC_2 5
529 #define SCSI_SPC_3 6
530
531 /*
532 * INQ PERIPHERAL QUALIFIERS
533 */
534 #define SCSI_INQ_PQ_CON 0x00
535 #define SCSI_INQ_PQ_NOT_CON 0x01
536 #define SCSI_INQ_PQ_NOT_CAP 0x03
537
538
539 /*
540 * Here are some scsi specific ioctl commands which are sometimes useful.
541 *
542 * Note that include/linux/cdrom.h also defines IOCTL 0x5300 - 0x5395
543 */
544
545 /* Used to obtain PUN and LUN info. Conflicts with CDROMAUDIOBUFSIZ */
546 #define SCSI_IOCTL_GET_IDLUN 0x5382
547
548 /* 0x5383 and 0x5384 were used for SCSI_IOCTL_TAGGED_{ENABLE,DISABLE} */
549
550 /* Used to obtain the host number of a device. */
551 #define SCSI_IOCTL_PROBE_HOST 0x5385
552
553 /* Used to obtain the bus number for a device */
554 #define SCSI_IOCTL_GET_BUS_NUMBER 0x5386
555
556 /* Used to obtain the PCI location of a device */
557 #define SCSI_IOCTL_GET_PCI 0x5387
558
559 /* Pull a u32 out of a SCSI message (using BE SCSI conventions) */
scsi_to_u32(__u8 * ptr)560 static inline __u32 scsi_to_u32(__u8 *ptr)
561 {
562 return (ptr[0]<<24) + (ptr[1]<<16) + (ptr[2]<<8) + ptr[3];
563 }
564
565 #endif /* _SCSI_SCSI_H */
566