LXR linux/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#define SD_FLUSH_TIMEOUT        (60 * HZ)
  23
  24/*
  25 * Number of allowed retries
  26 */
  27#define SD_MAX_RETRIES          5
  28#define SD_PASSTHROUGH_RETRIES  1
  29
  30/*
  31 * Size of the initial data buffer for mode and read capacity data
  32 */
  33#define SD_BUF_SIZE             512
  34
  35/*
  36 * Number of sectors at the end of the device to avoid multi-sector
  37 * accesses to in the case of last_sector_bug
  38 */
  39#define SD_LAST_BUGGY_SECTORS   8
  40
  41enum {
  42        SD_EXT_CDB_SIZE = 32,   /* Extended CDB size */
  43        SD_MEMPOOL_SIZE = 2,    /* CDB pool size */
  44};
  45
  46enum {
  47        SD_LBP_FULL = 0,        /* Full logical block provisioning */
  48        SD_LBP_UNMAP,           /* Use UNMAP command */
  49        SD_LBP_WS16,            /* Use WRITE SAME(16) with UNMAP bit */
  50        SD_LBP_WS10,            /* Use WRITE SAME(10) with UNMAP bit */
  51        SD_LBP_ZERO,            /* Use WRITE SAME(10) with zero payload */
  52        SD_LBP_DISABLE,         /* Discard disabled due to failed cmd */
  53};
  54
  55struct scsi_disk {
  56        struct scsi_driver *driver;     /* always &sd_template */
  57        struct scsi_device *device;
  58        struct device   dev;
  59        struct gendisk  *disk;
  60        atomic_t        openers;
  61        sector_t        capacity;       /* size in 512-byte sectors */
  62        u32             max_ws_blocks;
  63        u32             max_unmap_blocks;
  64        u32             unmap_granularity;
  65        u32             unmap_alignment;
  66        u32             index;
  67        unsigned int    physical_block_size;
  68        u8              media_present;
  69        u8              write_prot;
  70        u8              protection_type;/* Data Integrity Field */
  71        u8              provisioning_mode;
  72        unsigned        ATO : 1;        /* state of disk ATO bit */
  73        unsigned        WCE : 1;        /* state of disk WCE bit */
  74        unsigned        RCD : 1;        /* state of disk RCD bit, unused */
  75        unsigned        DPOFUA : 1;     /* state of disk DPOFUA bit */
  76        unsigned        first_scan : 1;
  77        unsigned        lbpme : 1;
  78        unsigned        lbprz : 1;
  79        unsigned        lbpu : 1;
  80        unsigned        lbpws : 1;
  81        unsigned        lbpws10 : 1;
  82        unsigned        lbpvpd : 1;
  83};
  84#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
  85
  86static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
  87{
  88        return container_of(disk->private_data, struct scsi_disk, driver);
  89}
  90
  91#define sd_printk(prefix, sdsk, fmt, a...)                              \
  92        (sdsk)->disk ?                                                  \
  93        sdev_printk(prefix, (sdsk)->device, "[%s] " fmt,                \
  94                    (sdsk)->disk->disk_name, ##a) :                     \
  95        sdev_printk(prefix, (sdsk)->device, fmt, ##a)
  96
  97/*
  98 * A DIF-capable target device can be formatted with different
  99 * protection schemes.  Currently 0 through 3 are defined:
 100 *
 101 * Type 0 is regular (unprotected) I/O
 102 *
 103 * Type 1 defines the contents of the guard and reference tags
 104 *
 105 * Type 2 defines the contents of the guard and reference tags and
 106 * uses 32-byte commands to seed the latter
 107 *
 108 * Type 3 defines the contents of the guard tag only
 109 */
 110
 111enum sd_dif_target_protection_types {
 112        SD_DIF_TYPE0_PROTECTION = 0x0,
 113        SD_DIF_TYPE1_PROTECTION = 0x1,
 114        SD_DIF_TYPE2_PROTECTION = 0x2,
 115        SD_DIF_TYPE3_PROTECTION = 0x3,
 116};
 117
 118/*
 119 * Data Integrity Field tuple.
 120 */
 121struct sd_dif_tuple {
 122       __be16 guard_tag;        /* Checksum */
 123       __be16 app_tag;          /* Opaque storage */
 124       __be32 ref_tag;          /* Target LBA or indirect LBA */
 125};
 126
 127#ifdef CONFIG_BLK_DEV_INTEGRITY
 128
 129extern void sd_dif_config_host(struct scsi_disk *);
 130extern int sd_dif_prepare(struct request *rq, sector_t, unsigned int);
 131extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
 132
 133#else /* CONFIG_BLK_DEV_INTEGRITY */
 134
 135static inline void sd_dif_config_host(struct scsi_disk *disk)
 136{
 137}
 138static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
 139{
 140        return 0;
 141}
 142static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
 143{
 144}
 145
 146#endif /* CONFIG_BLK_DEV_INTEGRITY */
 147
 148#endif /* _SCSI_DISK_H */
 149