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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 | 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 | } |
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 | } |
127 | |
128 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
129 | |
130 | #endif /* _SCSI_DISK_H */ |
131 |
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