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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 */ | |
a586d4f6 RR |
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 */ | |
48e4043d | 12 | #define VIRTIO_BLK_F_GEOMETRY 4 /* Legacy geometry available */ |
3ef53609 | 13 | #define VIRTIO_BLK_F_RO 5 /* Disk is read-only */ |
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14 | |
15 | struct virtio_blk_config | |
16 | { | |
17 | /* The capacity (in 512-byte sectors). */ | |
7757f09c | 18 | __u64 capacity; |
a586d4f6 | 19 | /* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */ |
7757f09c | 20 | __u32 size_max; |
a586d4f6 | 21 | /* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */ |
7757f09c | 22 | __u32 seg_max; |
48e4043d RH |
23 | /* geometry the device (if VIRTIO_BLK_F_GEOMETRY) */ |
24 | struct virtio_blk_geometry { | |
7757f09c | 25 | __u16 cylinders; |
48e4043d RH |
26 | __u8 heads; |
27 | __u8 sectors; | |
28 | } geometry; | |
a586d4f6 | 29 | } __attribute__((packed)); |
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30 | |
31 | /* These two define direction. */ | |
32 | #define VIRTIO_BLK_T_IN 0 | |
33 | #define VIRTIO_BLK_T_OUT 1 | |
34 | ||
35 | /* This bit says it's a scsi command, not an actual read or write. */ | |
36 | #define VIRTIO_BLK_T_SCSI_CMD 2 | |
37 | ||
38 | /* Barrier before this op. */ | |
39 | #define VIRTIO_BLK_T_BARRIER 0x80000000 | |
40 | ||
41 | /* This is the first element of the read scatter-gather list. */ | |
42 | struct virtio_blk_outhdr | |
43 | { | |
44 | /* VIRTIO_BLK_T* */ | |
45 | __u32 type; | |
46 | /* io priority. */ | |
47 | __u32 ioprio; | |
48 | /* Sector (ie. 512 byte offset) */ | |
49 | __u64 sector; | |
e467cde2 RR |
50 | }; |
51 | ||
cb38fa23 | 52 | /* And this is the final byte of the write scatter-gather list. */ |
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53 | #define VIRTIO_BLK_S_OK 0 |
54 | #define VIRTIO_BLK_S_IOERR 1 | |
55 | #define VIRTIO_BLK_S_UNSUPP 2 | |
e467cde2 | 56 | #endif /* _LINUX_VIRTIO_BLK_H */ |