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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
James Bottomleyf290f192009-02-08 21:59:48 -060012
13struct scsi_cmnd;
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
15/*
James Bottomleyd3f46f32008-01-15 11:11:46 -060016 * The maximum number of SG segments that we will put inside a
17 * scatterlist (unless chaining is used). Should ideally fit inside a
18 * single page, to avoid a higher order allocation. We could define this
19 * to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order. The
20 * minimum value is 32
21 */
22#define SCSI_MAX_SG_SEGMENTS 128
23
24/*
25 * Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit
26 * is totally arbitrary, a setting of 2048 will get you at least 8mb ios.
27 */
28#ifdef ARCH_HAS_SG_CHAIN
29#define SCSI_MAX_SG_CHAIN_SEGMENTS 2048
30#else
31#define SCSI_MAX_SG_CHAIN_SEGMENTS SCSI_MAX_SG_SEGMENTS
32#endif
33
34/*
Christoph Hellwige02f3f52006-01-13 19:04:00 +010035 * Special value for scanning to specify scanning or rescanning of all
36 * possible channels, (target) ids, or luns on a given shost.
37 */
38#define SCAN_WILD_CARD ~0
39
40/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 * SCSI opcodes
42 */
43
44#define TEST_UNIT_READY 0x00
45#define REZERO_UNIT 0x01
46#define REQUEST_SENSE 0x03
47#define FORMAT_UNIT 0x04
48#define READ_BLOCK_LIMITS 0x05
49#define REASSIGN_BLOCKS 0x07
Gerd Knorr daa6eda2005-05-10 10:59:13 +020050#define INITIALIZE_ELEMENT_STATUS 0x07
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#define READ_6 0x08
52#define WRITE_6 0x0a
53#define SEEK_6 0x0b
54#define READ_REVERSE 0x0f
55#define WRITE_FILEMARKS 0x10
56#define SPACE 0x11
57#define INQUIRY 0x12
58#define RECOVER_BUFFERED_DATA 0x14
59#define MODE_SELECT 0x15
60#define RESERVE 0x16
61#define RELEASE 0x17
62#define COPY 0x18
63#define ERASE 0x19
64#define MODE_SENSE 0x1a
65#define START_STOP 0x1b
66#define RECEIVE_DIAGNOSTIC 0x1c
67#define SEND_DIAGNOSTIC 0x1d
68#define ALLOW_MEDIUM_REMOVAL 0x1e
69
70#define SET_WINDOW 0x24
71#define READ_CAPACITY 0x25
72#define READ_10 0x28
73#define WRITE_10 0x2a
74#define SEEK_10 0x2b
Gerd Knorr daa6eda2005-05-10 10:59:13 +020075#define POSITION_TO_ELEMENT 0x2b
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#define WRITE_VERIFY 0x2e
77#define VERIFY 0x2f
78#define SEARCH_HIGH 0x30
79#define SEARCH_EQUAL 0x31
80#define SEARCH_LOW 0x32
81#define SET_LIMITS 0x33
82#define PRE_FETCH 0x34
83#define READ_POSITION 0x34
84#define SYNCHRONIZE_CACHE 0x35
85#define LOCK_UNLOCK_CACHE 0x36
86#define READ_DEFECT_DATA 0x37
87#define MEDIUM_SCAN 0x38
88#define COMPARE 0x39
89#define COPY_VERIFY 0x3a
90#define WRITE_BUFFER 0x3b
91#define READ_BUFFER 0x3c
92#define UPDATE_BLOCK 0x3d
93#define READ_LONG 0x3e
94#define WRITE_LONG 0x3f
95#define CHANGE_DEFINITION 0x40
96#define WRITE_SAME 0x41
97#define READ_TOC 0x43
98#define LOG_SELECT 0x4c
99#define LOG_SENSE 0x4d
FUJITA Tomonoric639d142008-01-23 01:32:01 +0900100#define XDWRITEREAD_10 0x53
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101#define MODE_SELECT_10 0x55
102#define RESERVE_10 0x56
103#define RELEASE_10 0x57
104#define MODE_SENSE_10 0x5a
105#define PERSISTENT_RESERVE_IN 0x5e
106#define PERSISTENT_RESERVE_OUT 0x5f
Boaz Harroshdb4742d2008-04-30 11:27:26 +0300107#define VARIABLE_LENGTH_CMD 0x7f
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108#define REPORT_LUNS 0xa0
Hannes Reinecke5a09e392006-10-20 09:58:47 +0200109#define MAINTENANCE_IN 0xa3
Hannes Reinecke057ea7c2008-07-17 16:53:21 -0700110#define MAINTENANCE_OUT 0xa4
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111#define MOVE_MEDIUM 0xa5
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200112#define EXCHANGE_MEDIUM 0xa6
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113#define READ_12 0xa8
114#define WRITE_12 0xaa
115#define WRITE_VERIFY_12 0xae
116#define SEARCH_HIGH_12 0xb0
117#define SEARCH_EQUAL_12 0xb1
118#define SEARCH_LOW_12 0xb2
119#define READ_ELEMENT_STATUS 0xb8
120#define SEND_VOLUME_TAG 0xb6
121#define WRITE_LONG_2 0xea
122#define READ_16 0x88
123#define WRITE_16 0x8a
124#define VERIFY_16 0x8f
125#define SERVICE_ACTION_IN 0x9e
126/* values for service action in */
127#define SAI_READ_CAPACITY_16 0x10
Hannes Reinecke5a09e392006-10-20 09:58:47 +0200128/* values for maintenance in */
129#define MI_REPORT_TARGET_PGS 0x0a
Hannes Reinecke057ea7c2008-07-17 16:53:21 -0700130/* values for maintenance out */
131#define MO_SET_TARGET_PGS 0x0a
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400132/* values for variable length command */
133#define READ_32 0x09
134#define WRITE_32 0x0b
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
Jeff Garzikb0955182005-05-12 15:45:22 -0400136/* Values for T10/04-262r7 */
137#define ATA_16 0x85 /* 16-byte pass-thru */
138#define ATA_12 0xa1 /* 12-byte pass-thru */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
140/*
Boaz Harroshdb4742d2008-04-30 11:27:26 +0300141 * SCSI command lengths
142 */
143
144#define SCSI_MAX_VARLEN_CDB_SIZE 260
145
146/* defined in T10 SCSI Primary Commands-2 (SPC2) */
147struct scsi_varlen_cdb_hdr {
148 u8 opcode; /* opcode always == VARIABLE_LENGTH_CMD */
149 u8 control;
150 u8 misc[5];
151 u8 additional_cdb_length; /* total cdb length - 8 */
152 __be16 service_action;
153 /* service specific data follows */
154};
155
156static inline unsigned
157scsi_varlen_cdb_length(const void *hdr)
158{
159 return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
160}
161
162extern const unsigned char scsi_command_size_tbl[8];
163#define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
164
165static inline unsigned
166scsi_command_size(const unsigned char *cmnd)
167{
168 return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
169 scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
170}
171
172/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 * SCSI Architecture Model (SAM) Status codes. Taken from SAM-3 draft
174 * T10/1561-D Revision 4 Draft dated 7th November 2002.
175 */
176#define SAM_STAT_GOOD 0x00
177#define SAM_STAT_CHECK_CONDITION 0x02
178#define SAM_STAT_CONDITION_MET 0x04
179#define SAM_STAT_BUSY 0x08
180#define SAM_STAT_INTERMEDIATE 0x10
181#define SAM_STAT_INTERMEDIATE_CONDITION_MET 0x14
182#define SAM_STAT_RESERVATION_CONFLICT 0x18
183#define SAM_STAT_COMMAND_TERMINATED 0x22 /* obsolete in SAM-3 */
184#define SAM_STAT_TASK_SET_FULL 0x28
185#define SAM_STAT_ACA_ACTIVE 0x30
186#define SAM_STAT_TASK_ABORTED 0x40
187
188/** scsi_status_is_good - check the status return.
189 *
190 * @status: the status passed up from the driver (including host and
191 * driver components)
192 *
193 * This returns true for known good conditions that may be treated as
194 * command completed normally
195 */
196static inline int scsi_status_is_good(int status)
197{
198 /*
199 * FIXME: bit0 is listed as reserved in SCSI-2, but is
200 * significant in SCSI-3. For now, we follow the SCSI-2
201 * behaviour and ignore reserved bits.
202 */
203 status &= 0xfe;
204 return ((status == SAM_STAT_GOOD) ||
205 (status == SAM_STAT_INTERMEDIATE) ||
206 (status == SAM_STAT_INTERMEDIATE_CONDITION_MET) ||
207 /* FIXME: this is obsolete in SAM-3 */
208 (status == SAM_STAT_COMMAND_TERMINATED));
209}
210
211/*
212 * Status codes. These are deprecated as they are shifted 1 bit right
213 * from those found in the SCSI standards. This causes confusion for
214 * applications that are ported to several OSes. Prefer SAM Status codes
215 * above.
216 */
217
218#define GOOD 0x00
219#define CHECK_CONDITION 0x01
220#define CONDITION_GOOD 0x02
221#define BUSY 0x04
222#define INTERMEDIATE_GOOD 0x08
223#define INTERMEDIATE_C_GOOD 0x0a
224#define RESERVATION_CONFLICT 0x0c
225#define COMMAND_TERMINATED 0x11
226#define QUEUE_FULL 0x14
227#define ACA_ACTIVE 0x18
228#define TASK_ABORTED 0x20
229
230#define STATUS_MASK 0xfe
231
232/*
233 * SENSE KEYS
234 */
235
236#define NO_SENSE 0x00
237#define RECOVERED_ERROR 0x01
238#define NOT_READY 0x02
239#define MEDIUM_ERROR 0x03
240#define HARDWARE_ERROR 0x04
241#define ILLEGAL_REQUEST 0x05
242#define UNIT_ATTENTION 0x06
243#define DATA_PROTECT 0x07
244#define BLANK_CHECK 0x08
245#define COPY_ABORTED 0x0a
246#define ABORTED_COMMAND 0x0b
247#define VOLUME_OVERFLOW 0x0d
248#define MISCOMPARE 0x0e
249
250
251/*
252 * DEVICE TYPES
Michael Tokarevd7b8bcb2006-10-27 16:02:37 +0400253 * Please keep them in 0x%02x format for $MODALIAS to work
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 */
255
256#define TYPE_DISK 0x00
257#define TYPE_TAPE 0x01
258#define TYPE_PRINTER 0x02
259#define TYPE_PROCESSOR 0x03 /* HP scanners use this */
260#define TYPE_WORM 0x04 /* Treated as ROM by our system */
261#define TYPE_ROM 0x05
262#define TYPE_SCANNER 0x06
263#define TYPE_MOD 0x07 /* Magneto-optical disk -
264 * - treated as TYPE_DISK */
265#define TYPE_MEDIUM_CHANGER 0x08
266#define TYPE_COMM 0x09 /* Communications device */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267#define TYPE_RAID 0x0c
James Bottomley7f602c52005-05-21 10:24:37 -0500268#define TYPE_ENCLOSURE 0x0d /* Enclosure Services Device */
Al Viro 631e8a12005-05-16 01:59:55 +0100269#define TYPE_RBC 0x0e
Boaz Harrosh82443a52009-01-25 16:51:33 +0200270#define TYPE_OSD 0x11
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271#define TYPE_NO_LUN 0x7f
272
James Bottomley89dddbc2008-02-03 15:32:59 -0600273/* SCSI protocols; these are taken from SPC-3 section 7.5 */
274enum scsi_protocol {
275 SCSI_PROTOCOL_FCP = 0, /* Fibre Channel */
276 SCSI_PROTOCOL_SPI = 1, /* parallel SCSI */
277 SCSI_PROTOCOL_SSA = 2, /* Serial Storage Architecture - Obsolete */
278 SCSI_PROTOCOL_SBP = 3, /* firewire */
279 SCSI_PROTOCOL_SRP = 4, /* Infiniband RDMA */
280 SCSI_PROTOCOL_ISCSI = 5,
281 SCSI_PROTOCOL_SAS = 6,
282 SCSI_PROTOCOL_ADT = 7, /* Media Changers */
283 SCSI_PROTOCOL_ATA = 8,
284 SCSI_PROTOCOL_UNSPEC = 0xf, /* No specific protocol */
285};
286
Matthew Wilcox4ff36712006-07-04 12:15:20 -0600287/* Returns a human-readable name for the device */
288extern const char * scsi_device_type(unsigned type);
289
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290/*
291 * standard mode-select header prepended to all mode-select commands
292 */
293
294struct ccs_modesel_head {
295 __u8 _r1; /* reserved */
296 __u8 medium; /* device-specific medium type */
297 __u8 _r2; /* reserved */
298 __u8 block_desc_length; /* block descriptor length */
299 __u8 density; /* device-specific density code */
300 __u8 number_blocks_hi; /* number of blocks in this block desc */
301 __u8 number_blocks_med;
302 __u8 number_blocks_lo;
303 __u8 _r3;
304 __u8 block_length_hi; /* block length for blocks in this desc */
305 __u8 block_length_med;
306 __u8 block_length_lo;
307};
308
309/*
310 * ScsiLun: 8 byte LUN.
311 */
312struct scsi_lun {
313 __u8 scsi_lun[8];
314};
315
316/*
James Bottomley01b291b2008-08-21 15:14:14 -0500317 * The Well Known LUNS (SAM-3) in our int representation of a LUN
318 */
319#define SCSI_W_LUN_BASE 0xc100
320#define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
321#define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
322#define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)
323
324static inline int scsi_is_wlun(unsigned int lun)
325{
326 return (lun & 0xff00) == SCSI_W_LUN_BASE;
327}
328
329
330/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 * MESSAGE CODES
332 */
333
334#define COMMAND_COMPLETE 0x00
335#define EXTENDED_MESSAGE 0x01
336#define EXTENDED_MODIFY_DATA_POINTER 0x00
337#define EXTENDED_SDTR 0x01
338#define EXTENDED_EXTENDED_IDENTIFY 0x02 /* SCSI-I only */
339#define EXTENDED_WDTR 0x03
340#define EXTENDED_PPR 0x04
341#define EXTENDED_MODIFY_BIDI_DATA_PTR 0x05
342#define SAVE_POINTERS 0x02
343#define RESTORE_POINTERS 0x03
344#define DISCONNECT 0x04
345#define INITIATOR_ERROR 0x05
346#define ABORT_TASK_SET 0x06
347#define MESSAGE_REJECT 0x07
348#define NOP 0x08
349#define MSG_PARITY_ERROR 0x09
350#define LINKED_CMD_COMPLETE 0x0a
351#define LINKED_FLG_CMD_COMPLETE 0x0b
352#define TARGET_RESET 0x0c
353#define ABORT_TASK 0x0d
354#define CLEAR_TASK_SET 0x0e
355#define INITIATE_RECOVERY 0x0f /* SCSI-II only */
356#define RELEASE_RECOVERY 0x10 /* SCSI-II only */
357#define CLEAR_ACA 0x16
358#define LOGICAL_UNIT_RESET 0x17
359#define SIMPLE_QUEUE_TAG 0x20
360#define HEAD_OF_QUEUE_TAG 0x21
361#define ORDERED_QUEUE_TAG 0x22
362#define IGNORE_WIDE_RESIDUE 0x23
363#define ACA 0x24
364#define QAS_REQUEST 0x55
365
366/* Old SCSI2 names, don't use in new code */
367#define BUS_DEVICE_RESET TARGET_RESET
368#define ABORT ABORT_TASK_SET
369
370/*
371 * Host byte codes
372 */
373
374#define DID_OK 0x00 /* NO error */
375#define DID_NO_CONNECT 0x01 /* Couldn't connect before timeout period */
376#define DID_BUS_BUSY 0x02 /* BUS stayed busy through time out period */
377#define DID_TIME_OUT 0x03 /* TIMED OUT for other reason */
378#define DID_BAD_TARGET 0x04 /* BAD target. */
379#define DID_ABORT 0x05 /* Told to abort for some other reason */
380#define DID_PARITY 0x06 /* Parity error */
381#define DID_ERROR 0x07 /* Internal error */
382#define DID_RESET 0x08 /* Reset by somebody. */
383#define DID_BAD_INTR 0x09 /* Got an interrupt we weren't expecting. */
384#define DID_PASSTHROUGH 0x0a /* Force command past mid-layer */
385#define DID_SOFT_ERROR 0x0b /* The low level driver just wish a retry */
386#define DID_IMM_RETRY 0x0c /* Retry without decrementing retry count */
bf341912005-04-12 17:49:09 -0500387#define DID_REQUEUE 0x0d /* Requeue command (no immediate retry) also
388 * without decrementing the retry count */
Mike Christiea4dfaa62008-08-19 18:45:25 -0500389#define DID_TRANSPORT_DISRUPTED 0x0e /* Transport error disrupted execution
390 * and the driver blocked the port to
391 * recover the link. Transport class will
392 * retry or fail IO */
393#define DID_TRANSPORT_FAILFAST 0x0f /* Transport class fastfailed the io */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394#define DRIVER_OK 0x00 /* Driver status */
395
396/*
397 * These indicate the error that occurred, and what is available.
398 */
399
400#define DRIVER_BUSY 0x01
401#define DRIVER_SOFT 0x02
402#define DRIVER_MEDIA 0x03
403#define DRIVER_ERROR 0x04
404
405#define DRIVER_INVALID 0x05
406#define DRIVER_TIMEOUT 0x06
407#define DRIVER_HARD 0x07
408#define DRIVER_SENSE 0x08
409
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410/*
411 * Internal return values.
412 */
413
414#define NEEDS_RETRY 0x2001
415#define SUCCESS 0x2002
416#define FAILED 0x2003
417#define QUEUED 0x2004
418#define SOFT_ERROR 0x2005
419#define ADD_TO_MLQUEUE 0x2006
420#define TIMEOUT_ERROR 0x2007
Chandra Seetharamana6a8d9f2008-05-01 14:49:46 -0700421#define SCSI_RETURN_NOT_HANDLED 0x2008
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
423/*
424 * Midlevel queue return values.
425 */
426#define SCSI_MLQUEUE_HOST_BUSY 0x1055
427#define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
428#define SCSI_MLQUEUE_EH_RETRY 0x1057
Mike Christief0c0a372008-08-17 15:24:38 -0500429#define SCSI_MLQUEUE_TARGET_BUSY 0x1058
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
431/*
432 * Use these to separate status msg and our bytes
433 *
434 * These are set by:
435 *
436 * status byte = set from target device
437 * msg_byte = return status from host adapter itself.
438 * host_byte = set by low-level driver to indicate status.
439 * driver_byte = set by mid-level.
440 */
441#define status_byte(result) (((result) >> 1) & 0x7f)
442#define msg_byte(result) (((result) >> 8) & 0xff)
443#define host_byte(result) (((result) >> 16) & 0xff)
444#define driver_byte(result) (((result) >> 24) & 0xff)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
446#define sense_class(sense) (((sense) >> 4) & 0x7)
447#define sense_error(sense) ((sense) & 0xf)
448#define sense_valid(sense) ((sense) & 0x80);
449
b6651122005-04-03 14:52:44 -0500450/*
451 * default timeouts
452*/
453#define FORMAT_UNIT_TIMEOUT (2 * 60 * 60 * HZ)
454#define START_STOP_TIMEOUT (60 * HZ)
455#define MOVE_MEDIUM_TIMEOUT (5 * 60 * HZ)
456#define READ_ELEMENT_STATUS_TIMEOUT (5 * 60 * HZ)
457#define READ_DEFECT_DATA_TIMEOUT (60 * HZ )
458
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459
460#define IDENTIFY_BASE 0x80
461#define IDENTIFY(can_disconnect, lun) (IDENTIFY_BASE |\
462 ((can_disconnect) ? 0x40 : 0) |\
463 ((lun) & 0x07))
464
465/*
466 * struct scsi_device::scsi_level values. For SCSI devices other than those
467 * prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
468 * where "resp" is a byte array of the response to an INQUIRY. The scsi_level
469 * variable is visible to the user via sysfs.
470 */
471
472#define SCSI_UNKNOWN 0
473#define SCSI_1 1
474#define SCSI_1_CCS 2
475#define SCSI_2 3
476#define SCSI_3 4 /* SPC */
477#define SCSI_SPC_2 5
478#define SCSI_SPC_3 6
479
480/*
481 * INQ PERIPHERAL QUALIFIERS
482 */
483#define SCSI_INQ_PQ_CON 0x00
484#define SCSI_INQ_PQ_NOT_CON 0x01
485#define SCSI_INQ_PQ_NOT_CAP 0x03
486
487
488/*
489 * Here are some scsi specific ioctl commands which are sometimes useful.
490 *
491 * Note that include/linux/cdrom.h also defines IOCTL 0x5300 - 0x5395
492 */
493
494/* Used to obtain PUN and LUN info. Conflicts with CDROMAUDIOBUFSIZ */
495#define SCSI_IOCTL_GET_IDLUN 0x5382
496
497/* 0x5383 and 0x5384 were used for SCSI_IOCTL_TAGGED_{ENABLE,DISABLE} */
498
499/* Used to obtain the host number of a device. */
500#define SCSI_IOCTL_PROBE_HOST 0x5385
501
502/* Used to obtain the bus number for a device */
503#define SCSI_IOCTL_GET_BUS_NUMBER 0x5386
504
505/* Used to obtain the PCI location of a device */
506#define SCSI_IOCTL_GET_PCI 0x5387
507
James Bottomley2908d772006-08-29 09:22:51 -0500508/* Pull a u32 out of a SCSI message (using BE SCSI conventions) */
FUJITA Tomonori4a531e82006-10-20 09:08:18 +0900509static inline __u32 scsi_to_u32(__u8 *ptr)
James Bottomley2908d772006-08-29 09:22:51 -0500510{
511 return (ptr[0]<<24) + (ptr[1]<<16) + (ptr[2]<<8) + ptr[3];
512}
513
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514#endif /* _SCSI_SCSI_H */