LXR linux/include/scsi/scsi

   1#ifndef _SCSI_SCSI_DEVICE_H
   2#define _SCSI_SCSI_DEVICE_H
   3
   4#include <linux/list.h>
   5#include <linux/spinlock.h>
   6#include <linux/workqueue.h>
   7#include <linux/blkdev.h>
   8#include <scsi/scsi.h>
   9#include <linux/atomic.h>
  10
  11struct device;
  12struct request_queue;
  13struct scsi_cmnd;
  14struct scsi_lun;
  15struct scsi_sense_hdr;
  16
  17struct scsi_mode_data {
  18        __u32   length;
  19        __u16   block_descriptor_length;
  20        __u8    medium_type;
  21        __u8    device_specific;
  22        __u8    header_length;
  23        __u8    longlba:1;
  24};
  25
  26/*
  27 * sdev state: If you alter this, you also need to alter scsi_sysfs.c
  28 * (for the ascii descriptions) and the state model enforcer:
  29 * scsi_lib:scsi_device_set_state().
  30 */
  31enum scsi_device_state {
  32        SDEV_CREATED = 1,       /* device created but not added to sysfs
  33                                 * Only internal commands allowed (for inq) */
  34        SDEV_RUNNING,           /* device properly configured
  35                                 * All commands allowed */
  36        SDEV_CANCEL,            /* beginning to delete device
  37                                 * Only error handler commands allowed */
  38        SDEV_DEL,               /* device deleted 
  39                                 * no commands allowed */
  40        SDEV_QUIESCE,           /* Device quiescent.  No block commands
  41                                 * will be accepted, only specials (which
  42                                 * originate in the mid-layer) */
  43        SDEV_OFFLINE,           /* Device offlined (by error handling or
  44                                 * user request */
  45        SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
  46        SDEV_BLOCK,             /* Device blocked by scsi lld.  No
  47                                 * scsi commands from user or midlayer
  48                                 * should be issued to the scsi
  49                                 * lld. */
  50        SDEV_CREATED_BLOCK,     /* same as above but for created devices */
  51};
  52
  53enum scsi_device_event {
  54        SDEV_EVT_MEDIA_CHANGE   = 1,    /* media has changed */
  55        SDEV_EVT_INQUIRY_CHANGE_REPORTED,               /* 3F 03  UA reported */
  56        SDEV_EVT_CAPACITY_CHANGE_REPORTED,              /* 2A 09  UA reported */
  57        SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED,       /* 38 07  UA reported */
  58        SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED,        /* 2A 01  UA reported */
  59        SDEV_EVT_LUN_CHANGE_REPORTED,                   /* 3F 0E  UA reported */
  60
  61        SDEV_EVT_FIRST          = SDEV_EVT_MEDIA_CHANGE,
  62        SDEV_EVT_LAST           = SDEV_EVT_LUN_CHANGE_REPORTED,
  63
  64        SDEV_EVT_MAXBITS        = SDEV_EVT_LAST + 1
  65};
  66
  67struct scsi_event {
  68        enum scsi_device_event  evt_type;
  69        struct list_head        node;
  70
  71        /* put union of data structures, for non-simple event types,
  72         * here
  73         */
  74};
  75
  76struct scsi_device {
  77        struct Scsi_Host *host;
  78        struct request_queue *request_queue;
  79
  80        /* the next two are protected by the host->host_lock */
  81        struct list_head    siblings;   /* list of all devices on this host */
  82        struct list_head    same_target_siblings; /* just the devices sharing same target id */
  83
  84        /* this is now protected by the request_queue->queue_lock */
  85        unsigned int device_busy;       /* commands actually active on
  86                                         * low-level. protected by queue_lock. */
  87        spinlock_t list_lock;
  88        struct list_head cmd_list;      /* queue of in use SCSI Command structures */
  89        struct list_head starved_entry;
  90        struct scsi_cmnd *current_cmnd; /* currently active command */
  91        unsigned short queue_depth;     /* How deep of a queue we want */
  92        unsigned short max_queue_depth; /* max queue depth */
  93        unsigned short last_queue_full_depth; /* These two are used by */
  94        unsigned short last_queue_full_count; /* scsi_track_queue_full() */
  95        unsigned long last_queue_full_time;     /* last queue full time */
  96        unsigned long queue_ramp_up_period;     /* ramp up period in jiffies */
  97#define SCSI_DEFAULT_RAMP_UP_PERIOD     (120 * HZ)
  98
  99        unsigned long last_queue_ramp_up;       /* last queue ramp up time */
 100
 101        unsigned int id, lun, channel;
 102
 103        unsigned int manufacturer;      /* Manufacturer of device, for using 
 104                                         * vendor-specific cmd's */
 105        unsigned sector_size;   /* size in bytes */
 106
 107        void *hostdata;         /* available to low-level driver */
 108        char type;
 109        char scsi_level;
 110        char inq_periph_qual;   /* PQ from INQUIRY data */      
 111        unsigned char inquiry_len;      /* valid bytes in 'inquiry' */
 112        unsigned char * inquiry;        /* INQUIRY response data */
 113        const char * vendor;            /* [back_compat] point into 'inquiry' ... */
 114        const char * model;             /* ... after scan; point to static string */
 115        const char * rev;               /* ... "nullnullnullnull" before scan */
 116
 117#define SCSI_VPD_PG_LEN                255
 118        int vpd_pg83_len;
 119        unsigned char *vpd_pg83;
 120        int vpd_pg80_len;
 121        unsigned char *vpd_pg80;
 122        unsigned char current_tag;      /* current tag */
 123        struct scsi_target      *sdev_target;   /* used only for single_lun */
 124
 125        unsigned int    sdev_bflags; /* black/white flags as also found in
 126                                 * scsi_devinfo.[hc]. For now used only to
 127                                 * pass settings from slave_alloc to scsi
 128                                 * core. */
 129        unsigned int eh_timeout; /* Error handling timeout */
 130        unsigned writeable:1;
 131        unsigned removable:1;
 132        unsigned changed:1;     /* Data invalid due to media change */
 133        unsigned busy:1;        /* Used to prevent races */
 134        unsigned lockable:1;    /* Able to prevent media removal */
 135        unsigned locked:1;      /* Media removal disabled */
 136        unsigned borken:1;      /* Tell the Seagate driver to be 
 137                                 * painfully slow on this device */
 138        unsigned disconnect:1;  /* can disconnect */
 139        unsigned soft_reset:1;  /* Uses soft reset option */
 140        unsigned sdtr:1;        /* Device supports SDTR messages */
 141        unsigned wdtr:1;        /* Device supports WDTR messages */
 142        unsigned ppr:1;         /* Device supports PPR messages */
 143        unsigned tagged_supported:1;    /* Supports SCSI-II tagged queuing */
 144        unsigned simple_tags:1; /* simple queue tag messages are enabled */
 145        unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
 146        unsigned was_reset:1;   /* There was a bus reset on the bus for 
 147                                 * this device */
 148        unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
 149                                     * because we did a bus reset. */
 150        unsigned use_10_for_rw:1; /* first try 10-byte read / write */
 151        unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
 152        unsigned no_report_opcodes:1;   /* no REPORT SUPPORTED OPERATION CODES */
 153        unsigned no_write_same:1;       /* no WRITE SAME command */
 154        unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
 155        unsigned skip_ms_page_8:1;      /* do not use MODE SENSE page 0x08 */
 156        unsigned skip_ms_page_3f:1;     /* do not use MODE SENSE page 0x3f */
 157        unsigned skip_vpd_pages:1;      /* do not read VPD pages */
 158        unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
 159        unsigned no_start_on_add:1;     /* do not issue start on add */
 160        unsigned allow_restart:1; /* issue START_UNIT in error handler */
 161        unsigned manage_start_stop:1;   /* Let HLD (sd) manage start/stop */
 162        unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
 163        unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
 164        unsigned select_no_atn:1;
 165        unsigned fix_capacity:1;        /* READ_CAPACITY is too high by 1 */
 166        unsigned guess_capacity:1;      /* READ_CAPACITY might be too high by 1 */
 167        unsigned retry_hwerror:1;       /* Retry HARDWARE_ERROR */
 168        unsigned last_sector_bug:1;     /* do not use multisector accesses on
 169                                           SD_LAST_BUGGY_SECTORS */
 170        unsigned no_read_disc_info:1;   /* Avoid READ_DISC_INFO cmds */
 171        unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
 172        unsigned try_rc_10_first:1;     /* Try READ_CAPACACITY_10 first */
 173        unsigned is_visible:1;  /* is the device visible in sysfs */
 174        unsigned wce_default_on:1;      /* Cache is ON by default */
 175        unsigned no_dif:1;      /* T10 PI (DIF) should be disabled */
 176        unsigned broken_fua:1;          /* Don't set FUA bit */
 177
 178        atomic_t disk_events_disable_depth; /* disable depth for disk events */
 179
 180        DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
 181        DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
 182        struct list_head event_list;    /* asserted events */
 183        struct work_struct event_work;
 184
 185        unsigned int device_blocked;    /* Device returned QUEUE_FULL. */
 186
 187        unsigned int max_device_blocked; /* what device_blocked counts down from  */
 188#define SCSI_DEFAULT_DEVICE_BLOCKED     3
 189
 190        atomic_t iorequest_cnt;
 191        atomic_t iodone_cnt;
 192        atomic_t ioerr_cnt;
 193
 194        struct device           sdev_gendev,
 195                                sdev_dev;
 196
 197        struct execute_work     ew; /* used to get process context on put */
 198        struct work_struct      requeue_work;
 199
 200        struct scsi_dh_data     *scsi_dh_data;
 201        enum scsi_device_state sdev_state;
 202        unsigned long           sdev_data[0];
 203} __attribute__((aligned(sizeof(unsigned long))));
 204
 205struct scsi_dh_devlist {
 206        char *vendor;
 207        char *model;
 208};
 209
 210typedef void (*activate_complete)(void *, int);
 211struct scsi_device_handler {
 212        /* Used by the infrastructure */
 213        struct list_head list; /* list of scsi_device_handlers */
 214
 215        /* Filled by the hardware handler */
 216        struct module *module;
 217        const char *name;
 218        const struct scsi_dh_devlist *devlist;
 219        int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
 220        int (*attach)(struct scsi_device *);
 221        void (*detach)(struct scsi_device *);
 222        int (*activate)(struct scsi_device *, activate_complete, void *);
 223        int (*prep_fn)(struct scsi_device *, struct request *);
 224        int (*set_params)(struct scsi_device *, const char *);
 225        bool (*match)(struct scsi_device *);
 226};
 227
 228struct scsi_dh_data {
 229        struct scsi_device_handler *scsi_dh;
 230        struct scsi_device *sdev;
 231        struct kref kref;
 232        char buf[0];
 233};
 234
 235#define to_scsi_device(d)       \
 236        container_of(d, struct scsi_device, sdev_gendev)
 237#define class_to_sdev(d)        \
 238        container_of(d, struct scsi_device, sdev_dev)
 239#define transport_class_to_sdev(class_dev) \
 240        to_scsi_device(class_dev->parent)
 241
 242#define sdev_printk(prefix, sdev, fmt, a...)    \
 243        dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
 244
 245#define sdev_dbg(sdev, fmt, a...) \
 246        dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
 247
 248#define scmd_printk(prefix, scmd, fmt, a...)                            \
 249        (scmd)->request->rq_disk ?                                      \
 250        sdev_printk(prefix, (scmd)->device, "[%s] " fmt,                \
 251                    (scmd)->request->rq_disk->disk_name, ##a) :         \
 252        sdev_printk(prefix, (scmd)->device, fmt, ##a)
 253
 254#define scmd_dbg(scmd, fmt, a...)                                          \
 255        do {                                                               \
 256                if ((scmd)->request->rq_disk)                              \
 257                        sdev_dbg((scmd)->device, "[%s] " fmt,              \
 258                                 (scmd)->request->rq_disk->disk_name, ##a);\
 259                else                                                       \
 260                        sdev_dbg((scmd)->device, fmt, ##a);                \
 261        } while (0)
 262
 263enum scsi_target_state {
 264        STARGET_CREATED = 1,
 265        STARGET_RUNNING,
 266        STARGET_DEL,
 267};
 268
 269/*
 270 * scsi_target: representation of a scsi target, for now, this is only
 271 * used for single_lun devices. If no one has active IO to the target,
 272 * starget_sdev_user is NULL, else it points to the active sdev.
 273 */
 274struct scsi_target {
 275        struct scsi_device      *starget_sdev_user;
 276        struct list_head        siblings;
 277        struct list_head        devices;
 278        struct device           dev;
 279        struct kref             reap_ref; /* last put renders target invisible */
 280        unsigned int            channel;
 281        unsigned int            id; /* target id ... replace
 282                                     * scsi_device.id eventually */
 283        unsigned int            create:1; /* signal that it needs to be added */
 284        unsigned int            single_lun:1;   /* Indicates we should only
 285                                                 * allow I/O to one of the luns
 286                                                 * for the device at a time. */
 287        unsigned int            pdt_1f_for_no_lun:1;    /* PDT = 0x1f
 288                                                 * means no lun present. */
 289        unsigned int            no_report_luns:1;       /* Don't use
 290                                                 * REPORT LUNS for scanning. */
 291        unsigned int            expecting_lun_change:1; /* A device has reported
 292                                                 * a 3F/0E UA, other devices on
 293                                                 * the same target will also. */
 294        /* commands actually active on LLD. protected by host lock. */
 295        unsigned int            target_busy;
 296        /*
 297         * LLDs should set this in the slave_alloc host template callout.
 298         * If set to zero then there is not limit.
 299         */
 300        unsigned int            can_queue;
 301        unsigned int            target_blocked;
 302        unsigned int            max_target_blocked;
 303#define SCSI_DEFAULT_TARGET_BLOCKED     3
 304
 305        char                    scsi_level;
 306        enum scsi_target_state  state;
 307        void                    *hostdata; /* available to low-level driver */
 308        unsigned long           starget_data[0]; /* for the transport */
 309        /* starget_data must be the last element!!!! */
 310} __attribute__((aligned(sizeof(unsigned long))));
 311
 312#define to_scsi_target(d)       container_of(d, struct scsi_target, dev)
 313static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
 314{
 315        return to_scsi_target(sdev->sdev_gendev.parent);
 316}
 317#define transport_class_to_starget(class_dev) \
 318        to_scsi_target(class_dev->parent)
 319
 320#define starget_printk(prefix, starget, fmt, a...)      \
 321        dev_printk(prefix, &(starget)->dev, fmt, ##a)
 322
 323extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
 324                uint, uint, uint, void *hostdata);
 325extern int scsi_add_device(struct Scsi_Host *host, uint channel,
 326                           uint target, uint lun);
 327extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
 328extern void scsi_remove_device(struct scsi_device *);
 329extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
 330void scsi_attach_vpd(struct scsi_device *sdev);
 331
 332extern int scsi_device_get(struct scsi_device *);
 333extern void scsi_device_put(struct scsi_device *);
 334extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
 335                                              uint, uint, uint);
 336extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
 337                                                uint, uint, uint);
 338extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
 339                                                        uint);
 340extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
 341                                                          uint);
 342extern void starget_for_each_device(struct scsi_target *, void *,
 343                     void (*fn)(struct scsi_device *, void *));
 344extern void __starget_for_each_device(struct scsi_target *, void *,
 345                                      void (*fn)(struct scsi_device *,
 346                                                 void *));
 347
 348/* only exposed to implement shost_for_each_device */
 349extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
 350                                                  struct scsi_device *);
 351
 352/**
 353 * shost_for_each_device - iterate over all devices of a host
 354 * @sdev: the &struct scsi_device to use as a cursor
 355 * @shost: the &struct scsi_host to iterate over
 356 *
 357 * Iterator that returns each device attached to @shost.  This loop
 358 * takes a reference on each device and releases it at the end.  If
 359 * you break out of the loop, you must call scsi_device_put(sdev).
 360 */
 361#define shost_for_each_device(sdev, shost) \
 362        for ((sdev) = __scsi_iterate_devices((shost), NULL); \
 363             (sdev); \
 364             (sdev) = __scsi_iterate_devices((shost), (sdev)))
 365
 366/**
 367 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
 368 * @sdev: the &struct scsi_device to use as a cursor
 369 * @shost: the &struct scsi_host to iterate over
 370 *
 371 * Iterator that returns each device attached to @shost.  It does _not_
 372 * take a reference on the scsi_device, so the whole loop must be
 373 * protected by shost->host_lock.
 374 *
 375 * Note: The only reason to use this is because you need to access the
 376 * device list in interrupt context.  Otherwise you really want to use
 377 * shost_for_each_device instead.
 378 */
 379#define __shost_for_each_device(sdev, shost) \
 380        list_for_each_entry((sdev), &((shost)->__devices), siblings)
 381
 382extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
 383extern int scsi_track_queue_full(struct scsi_device *, int);
 384
 385extern int scsi_set_medium_removal(struct scsi_device *, char);
 386
 387extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 388                           unsigned char *buffer, int len, int timeout,
 389                           int retries, struct scsi_mode_data *data,
 390                           struct scsi_sense_hdr *);
 391extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
 392                            int modepage, unsigned char *buffer, int len,
 393                            int timeout, int retries,
 394                            struct scsi_mode_data *data,
 395                            struct scsi_sense_hdr *);
 396extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
 397                                int retries, struct scsi_sense_hdr *sshdr);
 398extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
 399                             int buf_len);
 400extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
 401                              unsigned int len, unsigned char opcode);
 402extern int scsi_device_set_state(struct scsi_device *sdev,
 403                                 enum scsi_device_state state);
 404extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
 405                                          gfp_t gfpflags);
 406extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
 407extern void sdev_evt_send_simple(struct scsi_device *sdev,
 408                          enum scsi_device_event evt_type, gfp_t gfpflags);
 409extern int scsi_device_quiesce(struct scsi_device *sdev);
 410extern void scsi_device_resume(struct scsi_device *sdev);
 411extern void scsi_target_quiesce(struct scsi_target *);
 412extern void scsi_target_resume(struct scsi_target *);
 413extern void scsi_scan_target(struct device *parent, unsigned int channel,
 414                             unsigned int id, unsigned int lun, int rescan);
 415extern void scsi_target_reap(struct scsi_target *);
 416extern void scsi_target_block(struct device *);
 417extern void scsi_target_unblock(struct device *, enum scsi_device_state);
 418extern void scsi_remove_target(struct device *);
 419extern void int_to_scsilun(unsigned int, struct scsi_lun *);
 420extern int scsilun_to_int(struct scsi_lun *);
 421extern const char *scsi_device_state_name(enum scsi_device_state);
 422extern int scsi_is_sdev_device(const struct device *);
 423extern int scsi_is_target_device(const struct device *);
 424extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
 425                        int data_direction, void *buffer, unsigned bufflen,
 426                        unsigned char *sense, int timeout, int retries,
 427                        u64 flags, int *resid);
 428extern int scsi_execute_req_flags(struct scsi_device *sdev,
 429        const unsigned char *cmd, int data_direction, void *buffer,
 430        unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
 431        int retries, int *resid, u64 flags);
 432static inline int scsi_execute_req(struct scsi_device *sdev,
 433        const unsigned char *cmd, int data_direction, void *buffer,
 434        unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
 435        int retries, int *resid)
 436{
 437        return scsi_execute_req_flags(sdev, cmd, data_direction, buffer,
 438                bufflen, sshdr, timeout, retries, resid, 0);
 439}
 440extern void sdev_disable_disk_events(struct scsi_device *sdev);
 441extern void sdev_enable_disk_events(struct scsi_device *sdev);
 442
 443#ifdef CONFIG_PM_RUNTIME
 444extern int scsi_autopm_get_device(struct scsi_device *);
 445extern void scsi_autopm_put_device(struct scsi_device *);
 446#else
 447static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
 448static inline void scsi_autopm_put_device(struct scsi_device *d) {}
 449#endif /* CONFIG_PM_RUNTIME */
 450
 451static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
 452{
 453        return device_reprobe(&sdev->sdev_gendev);
 454}
 455
 456static inline unsigned int sdev_channel(struct scsi_device *sdev)
 457{
 458        return sdev->channel;
 459}
 460
 461static inline unsigned int sdev_id(struct scsi_device *sdev)
 462{
 463        return sdev->id;
 464}
 465
 466#define scmd_id(scmd) sdev_id((scmd)->device)
 467#define scmd_channel(scmd) sdev_channel((scmd)->device)
 468
 469/*
 470 * checks for positions of the SCSI state machine
 471 */
 472static inline int scsi_device_online(struct scsi_device *sdev)
 473{
 474        return (sdev->sdev_state != SDEV_OFFLINE &&
 475                sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
 476                sdev->sdev_state != SDEV_DEL);
 477}
 478static inline int scsi_device_blocked(struct scsi_device *sdev)
 479{
 480        return sdev->sdev_state == SDEV_BLOCK ||
 481                sdev->sdev_state == SDEV_CREATED_BLOCK;
 482}
 483static inline int scsi_device_created(struct scsi_device *sdev)
 484{
 485        return sdev->sdev_state == SDEV_CREATED ||
 486                sdev->sdev_state == SDEV_CREATED_BLOCK;
 487}
 488
 489/* accessor functions for the SCSI parameters */
 490static inline int scsi_device_sync(struct scsi_device *sdev)
 491{
 492        return sdev->sdtr;
 493}
 494static inline int scsi_device_wide(struct scsi_device *sdev)
 495{
 496        return sdev->wdtr;
 497}
 498static inline int scsi_device_dt(struct scsi_device *sdev)
 499{
 500        return sdev->ppr;
 501}
 502static inline int scsi_device_dt_only(struct scsi_device *sdev)
 503{
 504        if (sdev->inquiry_len < 57)
 505                return 0;
 506        return (sdev->inquiry[56] & 0x0c) == 0x04;
 507}
 508static inline int scsi_device_ius(struct scsi_device *sdev)
 509{
 510        if (sdev->inquiry_len < 57)
 511                return 0;
 512        return sdev->inquiry[56] & 0x01;
 513}
 514static inline int scsi_device_qas(struct scsi_device *sdev)
 515{
 516        if (sdev->inquiry_len < 57)
 517                return 0;
 518        return sdev->inquiry[56] & 0x02;
 519}
 520static inline int scsi_device_enclosure(struct scsi_device *sdev)
 521{
 522        return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
 523}
 524
 525static inline int scsi_device_protection(struct scsi_device *sdev)
 526{
 527        if (sdev->no_dif)
 528                return 0;
 529
 530        return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
 531}
 532
 533static inline int scsi_device_tpgs(struct scsi_device *sdev)
 534{
 535        return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
 536}
 537
 538#define MODULE_ALIAS_SCSI_DEVICE(type) \
 539        MODULE_ALIAS("scsi:t-" __stringify(type) "*")
 540#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
 541
 542#endif /* _SCSI_SCSI_DEVICE_H */
 543