LCOV - code coverage report
Current view: top level - drivers/scsi - sd.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 2 3 66.7 %
Date: 2017-01-25 Functions: 2 3 66.7 %

          Line data    Source code
       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             : /*
      35             :  * Number of sectors at the end of the device to avoid multi-sector
      36             :  * accesses to in the case of last_sector_bug
      37             :  */
      38             : #define SD_LAST_BUGGY_SECTORS   8
      39             : 
      40             : enum {
      41             :         SD_EXT_CDB_SIZE = 32,   /* Extended CDB size */
      42             :         SD_MEMPOOL_SIZE = 2,    /* CDB pool size */
      43             : };
      44             : 
      45             : struct scsi_disk {
      46             :         struct scsi_driver *driver;     /* always &sd_template */
      47             :         struct scsi_device *device;
      48             :         struct device   dev;
      49             :         struct gendisk  *disk;
      50             :         unsigned int    openers;        /* protected by BKL for now, yuck */
      51             :         sector_t        capacity;       /* size in 512-byte sectors */
      52             :         u32             index;
      53             :         unsigned short  hw_sector_size;
      54             :         u8              media_present;
      55             :         u8              write_prot;
      56             :         u8              protection_type;/* Data Integrity Field */
      57             :         unsigned        previous_state : 1;
      58             :         unsigned        ATO : 1;        /* state of disk ATO bit */
      59             :         unsigned        WCE : 1;        /* state of disk WCE bit */
      60             :         unsigned        RCD : 1;        /* state of disk RCD bit, unused */
      61             :         unsigned        DPOFUA : 1;     /* state of disk DPOFUA bit */
      62             :         unsigned        first_scan : 1;
      63             :         unsigned        thin_provisioning : 1;
      64             :         unsigned        unmap : 1;
      65             : };
      66             : #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
      67             : 
      68             : static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
      69             : {
      70         404 :         return container_of(disk->private_data, struct scsi_disk, driver);
      71             : }
      72             : 
      73             : #define sd_printk(prefix, sdsk, fmt, a...)                              \
      74             :         (sdsk)->disk ?                                                       \
      75             :         sdev_printk(prefix, (sdsk)->device, "[%s] " fmt,           \
      76             :                     (sdsk)->disk->disk_name, ##a) :                       \
      77             :         sdev_printk(prefix, (sdsk)->device, fmt, ##a)
      78             : 
      79             : /*
      80             :  * A DIF-capable target device can be formatted with different
      81             :  * protection schemes.  Currently 0 through 3 are defined:
      82             :  *
      83             :  * Type 0 is regular (unprotected) I/O
      84             :  *
      85             :  * Type 1 defines the contents of the guard and reference tags
      86             :  *
      87             :  * Type 2 defines the contents of the guard and reference tags and
      88             :  * uses 32-byte commands to seed the latter
      89             :  *
      90             :  * Type 3 defines the contents of the guard tag only
      91             :  */
      92             : 
      93             : enum sd_dif_target_protection_types {
      94             :         SD_DIF_TYPE0_PROTECTION = 0x0,
      95             :         SD_DIF_TYPE1_PROTECTION = 0x1,
      96             :         SD_DIF_TYPE2_PROTECTION = 0x2,
      97             :         SD_DIF_TYPE3_PROTECTION = 0x3,
      98             : };
      99             : 
     100             : /*
     101             :  * Data Integrity Field tuple.
     102             :  */
     103             : struct sd_dif_tuple {
     104             :        __be16 guard_tag;        /* Checksum */
     105             :        __be16 app_tag;          /* Opaque storage */
     106             :        __be32 ref_tag;          /* Target LBA or indirect LBA */
     107             : };
     108             : 
     109             : #ifdef CONFIG_BLK_DEV_INTEGRITY
     110             : 
     111             : extern void sd_dif_config_host(struct scsi_disk *);
     112             : extern int sd_dif_prepare(struct request *rq, sector_t, unsigned int);
     113             : extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
     114             : 
     115             : #else /* CONFIG_BLK_DEV_INTEGRITY */
     116             : 
     117             : static inline void sd_dif_config_host(struct scsi_disk *disk)
     118             : {
     119           0 : }
     120             : static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
     121             : {
     122             :         return 0;
     123             : }
     124             : static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
     125             : {
     126           7 : }
     127             : 
     128             : #endif /* CONFIG_BLK_DEV_INTEGRITY */
     129             : 
     130             : #endif /* _SCSI_DISK_H */

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