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1 | #ifndef _LINUX_VIRTIO_BLK_H |
2 | #define _LINUX_VIRTIO_BLK_H | |
3 | #include <linux/virtio_config.h> | |
4 | ||
5 | /* The ID for virtio_block */ | |
6 | #define VIRTIO_ID_BLOCK 2 | |
7 | ||
8 | /* Feature bits */ | |
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9 | #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ |
10 | #define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */ | |
11 | #define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */ | |
12 | ||
13 | struct virtio_blk_config | |
14 | { | |
15 | /* The capacity (in 512-byte sectors). */ | |
16 | __le64 capacity; | |
17 | /* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */ | |
18 | __le32 size_max; | |
19 | /* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */ | |
20 | __le32 seg_max; | |
21 | } __attribute__((packed)); | |
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22 | |
23 | /* These two define direction. */ | |
24 | #define VIRTIO_BLK_T_IN 0 | |
25 | #define VIRTIO_BLK_T_OUT 1 | |
26 | ||
27 | /* This bit says it's a scsi command, not an actual read or write. */ | |
28 | #define VIRTIO_BLK_T_SCSI_CMD 2 | |
29 | ||
30 | /* Barrier before this op. */ | |
31 | #define VIRTIO_BLK_T_BARRIER 0x80000000 | |
32 | ||
33 | /* This is the first element of the read scatter-gather list. */ | |
34 | struct virtio_blk_outhdr | |
35 | { | |
36 | /* VIRTIO_BLK_T* */ | |
37 | __u32 type; | |
38 | /* io priority. */ | |
39 | __u32 ioprio; | |
40 | /* Sector (ie. 512 byte offset) */ | |
41 | __u64 sector; | |
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42 | }; |
43 | ||
44 | #define VIRTIO_BLK_S_OK 0 | |
45 | #define VIRTIO_BLK_S_IOERR 1 | |
46 | #define VIRTIO_BLK_S_UNSUPP 2 | |
47 | ||
48 | /* This is the first element of the write scatter-gather list */ | |
49 | struct virtio_blk_inhdr | |
50 | { | |
51 | unsigned char status; | |
52 | }; | |
53 | #endif /* _LINUX_VIRTIO_BLK_H */ |