参照元

説明

参考

実装

struct scsi_device {
        struct Scsi_Host *host;
        struct request_queue *request_queue;
        /* the next two are protected by the host->host_lock */
        struct list_head    siblings;   /* list of all devices on this host */
        struct list_head    same_target_siblings; /* just the devices sharing same target id */
        /* this is now protected by the request_queue->queue_lock */
        unsigned int device_busy;       /* commands actually active on
                                         * low-level. protected by queue_lock. */

        spinlock_t list_lock;
        struct list_head cmd_list;      /* queue of in use SCSI Command structures */
        struct list_head starved_entry;
        struct scsi_cmnd *current_cmnd; /* currently active command */
        unsigned short queue_depth;     /* How deep of a queue we want */
        unsigned short last_queue_full_depth; /* These two are used by */
        unsigned short last_queue_full_count; /* scsi_track_queue_full() */
        unsigned long last_queue_full_time;/* don't let QUEUE_FULLs on the same
                                           jiffie count on our counter, they
                                           could all be from the same event. */

        unsigned int id, lun, channel;

        unsigned int manufacturer;      /* Manufacturer of device, for using
                                         * vendor-specific cmd's */
        unsigned sector_size;   /* size in bytes */

        void *hostdata;         /* available to low-level driver */
        char type;
        char scsi_level;
        char inq_periph_qual;   /* PQ from INQUIRY data */
        unsigned char inquiry_len;      /* valid bytes in 'inquiry' */
        unsigned char * inquiry;        /* INQUIRY response data */
        const char * vendor;            /* [back_compat] point into 'inquiry' ... */
        const char * model;             /* ... after scan; point to static string */
        const char * rev;               /* ... "nullnullnullnull" before scan */
        unsigned char current_tag;      /* current tag */
        struct scsi_target      *sdev_target;   /* used only for single_lun */
        unsigned int    sdev_bflags; /* black/white flags as also found in
                                 * scsi_devinfo.[hc]. For now used only to
                                 * pass settings from slave_alloc to scsi
                                 * core. */
        unsigned writeable:1;
        unsigned removable:1;
        unsigned changed:1;     /* Data invalid due to media change */
        unsigned busy:1;        /* Used to prevent races */
        unsigned lockable:1;    /* Able to prevent media removal */
        unsigned locked:1;      /* Media removal disabled */
        unsigned borken:1;      /* Tell the Seagate driver to be
                                 * painfully slow on this device */
        unsigned disconnect:1;  /* can disconnect */
        unsigned soft_reset:1;  /* Uses soft reset option */
        unsigned sdtr:1;        /* Device supports SDTR messages */
        unsigned wdtr:1;        /* Device supports WDTR messages */
        unsigned ppr:1;         /* Device supports PPR messages */
        unsigned tagged_supported:1;    /* Supports SCSI-II tagged queuing */
        unsigned simple_tags:1; /* simple queue tag messages are enabled */
        unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
        unsigned was_reset:1;   /* There was a bus reset on the bus for
                                 * this device */
        unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
                                     * because we did a bus reset. */
        unsigned use_10_for_rw:1; /* first try 10-byte read / write */
        unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
        unsigned skip_ms_page_8:1;      /* do not use MODE SENSE page 0x08 */
        unsigned skip_ms_page_3f:1;     /* do not use MODE SENSE page 0x3f */
        unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
        unsigned no_start_on_add:1;     /* do not issue start on add */
        unsigned allow_restart:1; /* issue START_UNIT in error handler */
        unsigned manage_start_stop:1;   /* Let HLD (sd) manage start/stop */
        unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
        unsigned select_no_atn:1;
        unsigned fix_capacity:1;        /* READ_CAPACITY is too high by 1 */
        unsigned guess_capacity:1;      /* READ_CAPACITY might be too high by 1 */
        unsigned retry_hwerror:1;       /* Retry HARDWARE_ERROR */
        unsigned last_sector_bug:1;     /* Always read last sector in a 1 sector read */

        DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
        struct list_head event_list;    /* asserted events */
        struct work_struct event_work;
        unsigned int device_blocked;    /* Device returned QUEUE_FULL. */

        unsigned int max_device_blocked; /* what device_blocked counts down from */
#define SCSI_DEFAULT_DEVICE_BLOCKED     3

        atomic_t iorequest_cnt;
        atomic_t iodone_cnt;
        atomic_t ioerr_cnt;
        int timeout;

        struct device           sdev_gendev;
        struct class_device     sdev_classdev;
        struct execute_work     ew; /* used to get process context on put */
        enum scsi_device_state sdev_state;
        unsigned long           sdev_data[0];
} __attribute__((aligned(sizeof(unsigned long))));

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