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