drivers/scsi/sd.h

   1 #ifndef _SCSI_DISK_H
   2 #define _SCSI_DISK_H
   3
   4 /*
   5  * More than enough for everybody ;)  The huge number of majors
   6  * is a leftover from 16bit dev_t days, we don't really need that
   7  * much numberspace.
   8  */
   9 #define SD_MAJORS       16
  10
  11 /*
  12  * This is limited by the naming scheme enforced in sd_probe,
  13  * add another character to it if you really need more disks.
  14  */
  15 #define SD_MAX_DISKS    (((26 * 26) + 26 + 1) * 26)
  16
  17 /*
  18  * Time out in seconds for disks and Magneto-opticals (which are slower).
  19  */
  20 #define SD_TIMEOUT              (30 * HZ)
  21 #define SD_MOD_TIMEOUT          (75 * HZ)
  22
  23 /*
  24  * Number of allowed retries
  25  */
  26 #define SD_MAX_RETRIES          5
  27 #define SD_PASSTHROUGH_RETRIES  1
  28
  29 /*
  30  * Size of the initial data buffer for mode and read capacity data
  31  */
  32 #define SD_BUF_SIZE             512
  33
  34 struct scsi_disk {
  35         struct scsi_driver *driver;     /* always &sd_template */
  36         struct scsi_device *device;
  37         struct device   dev;
  38         struct gendisk  *disk;
  39         unsigned int    openers;        /* protected by BKL for now, yuck */
  40         sector_t        capacity;       /* size in 512-byte sectors */
  41         u32             index;
  42         u8              media_present;
  43         u8              write_prot;
  44         u8              protection_type;/* Data Integrity Field */
  45         unsigned        previous_state : 1;
  46         unsigned        ATO : 1;        /* state of disk ATO bit */
  47         unsigned        WCE : 1;        /* state of disk WCE bit */
  48         unsigned        RCD : 1;        /* state of disk RCD bit, unused */
  49         unsigned        DPOFUA : 1;     /* state of disk DPOFUA bit */
  50 };
  51 #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
  52
  53 static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
  54 {
  55         return container_of(disk->private_data, struct scsi_disk, driver);
  56 }
  57
  58 #define sd_printk(prefix, sdsk, fmt, a...)                              \
  59         (sdsk)->disk ?                                                  \
  60         sdev_printk(prefix, (sdsk)->device, "[%s] " fmt,                \
  61                     (sdsk)->disk->disk_name, ##a) :                     \
  62         sdev_printk(prefix, (sdsk)->device, fmt, ##a)
  63
  64 /*
  65  * A DIF-capable target device can be formatted with different
  66  * protection schemes.  Currently 0 through 3 are defined:
  67  *
  68  * Type 0 is regular (unprotected) I/O
  69  *
  70  * Type 1 defines the contents of the guard and reference tags
  71  *
  72  * Type 2 defines the contents of the guard and reference tags and
  73  * uses 32-byte commands to seed the latter
  74  *
  75  * Type 3 defines the contents of the guard tag only
  76  */
  77
  78 enum sd_dif_target_protection_types {
  79         SD_DIF_TYPE0_PROTECTION = 0x0,
  80         SD_DIF_TYPE1_PROTECTION = 0x1,
  81         SD_DIF_TYPE2_PROTECTION = 0x2,
  82         SD_DIF_TYPE3_PROTECTION = 0x3,
  83 };
  84
  85 /*
  86  * Data Integrity Field tuple.
  87  */
  88 struct sd_dif_tuple {
  89        __be16 guard_tag;        /* Checksum */
  90        __be16 app_tag;          /* Opaque storage */
  91        __be32 ref_tag;          /* Target LBA or indirect LBA */
  92 };
  93
  94 #if defined(CONFIG_BLK_DEV_INTEGRITY)
  95
  96 extern void sd_dif_op(struct scsi_cmnd *, unsigned int, unsigned int);
  97 extern void sd_dif_config_host(struct scsi_disk *);
  98 extern int sd_dif_prepare(struct request *rq, sector_t, unsigned int);
  99 extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
 100
 101 #else /* CONFIG_BLK_DEV_INTEGRITY */
 102
 103 #define sd_dif_op(a, b, c)                      do { } while (0)
 104 #define sd_dif_config_host(a)                   do { } while (0)
 105 #define sd_dif_prepare(a, b, c)                 (0)
 106 #define sd_dif_complete(a, b)                   (0)
 107
 108 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 109
 110 #endif /* _SCSI_DISK_H */