tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
46struct scsi_disk {
47 struct scsi_driver *driver; /* always &sd_template */
48 struct scsi_device *device;
49 struct device dev;
50 struct gendisk *disk;
51 atomic_t openers;
52 sector_t capacity; /* size in 512-byte sectors */
53 u32 index;
54 unsigned int physical_block_size;
55 u8 media_present;
56 u8 write_prot;
57 u8 protection_type;/* Data Integrity Field */
58 unsigned previous_state : 1;
59 unsigned ATO : 1; /* state of disk ATO bit */
60 unsigned WCE : 1; /* state of disk WCE bit */
61 unsigned RCD : 1; /* state of disk RCD bit, unused */
62 unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
63 unsigned first_scan : 1;
64 unsigned thin_provisioning : 1;
65 unsigned unmap : 1;
66 unsigned tpws : 1;
67 unsigned tpu : 1;
68 unsigned tpvpd : 1;
69};
70#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
71
72static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
73{
74 return container_of(disk->private_data, struct scsi_disk, driver);
75}
76
77#define sd_printk(prefix, sdsk, fmt, a...) \
78 (sdsk)->disk ? \
79 sdev_printk(prefix, (sdsk)->device, "[%s] " fmt, \
80 (sdsk)->disk->disk_name, ##a) : \
81 sdev_printk(prefix, (sdsk)->device, fmt, ##a)
82
83/*
84 * A DIF-capable target device can be formatted with different
85 * protection schemes. Currently 0 through 3 are defined:
86 *
87 * Type 0 is regular (unprotected) I/O
88 *
89 * Type 1 defines the contents of the guard and reference tags
90 *
91 * Type 2 defines the contents of the guard and reference tags and
92 * uses 32-byte commands to seed the latter
93 *
94 * Type 3 defines the contents of the guard tag only
95 */
96
97enum sd_dif_target_protection_types {
98 SD_DIF_TYPE0_PROTECTION = 0x0,
99 SD_DIF_TYPE1_PROTECTION = 0x1,
100 SD_DIF_TYPE2_PROTECTION = 0x2,
101 SD_DIF_TYPE3_PROTECTION = 0x3,
102};
103
104/*
105 * Data Integrity Field tuple.
106 */
107struct sd_dif_tuple {
108 __be16 guard_tag; /* Checksum */
109 __be16 app_tag; /* Opaque storage */
110 __be32 ref_tag; /* Target LBA or indirect LBA */
111};
112
113#ifdef CONFIG_BLK_DEV_INTEGRITY
114
115extern void sd_dif_config_host(struct scsi_disk *);
116extern int sd_dif_prepare(struct request *rq, sector_t, unsigned int);
117extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
118
119#else /* CONFIG_BLK_DEV_INTEGRITY */
120
121static inline void sd_dif_config_host(struct scsi_disk *disk)
122{
123}
124static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
125{
126 return 0;
127}
128static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
129{
130}
131
132#endif /* CONFIG_BLK_DEV_INTEGRITY */
133
134#endif /* _SCSI_DISK_H */