projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| e467cde2 RR |
1 | #ifndef _LINUX_VIRTIO_BLK_H |
| 2 | #define _LINUX_VIRTIO_BLK_H | |
| 674bfc23 RR |
3 | /* This header is BSD licensed so anyone can use the definitions to implement |
| 4 | * compatible drivers/servers. */ | |
| 982f8184 | 5 | #include <linux/types.h> |
| e467cde2 RR |
6 | #include <linux/virtio_config.h> |
| 7 | ||
| 8 | /* The ID for virtio_block */ | |
| 9 | #define VIRTIO_ID_BLOCK 2 | |
| 10 | ||
| 11 | /* Feature bits */ | |
| a586d4f6 RR |
12 | #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ |
| 13 | #define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */ | |
| 14 | #define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */ | |
| 48e4043d | 15 | #define VIRTIO_BLK_F_GEOMETRY 4 /* Legacy geometry available */ |
| 3ef53609 | 16 | #define VIRTIO_BLK_F_RO 5 /* Disk is read-only */ |
| 066f4d82 | 17 | #define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/ |
| a586d4f6 RR |
18 | |
| 19 | struct virtio_blk_config | |
| 20 | { | |
| 21 | /* The capacity (in 512-byte sectors). */ | |
| 7757f09c | 22 | __u64 capacity; |
| a586d4f6 | 23 | /* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */ |
| 7757f09c | 24 | __u32 size_max; |
| a586d4f6 | 25 | /* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */ |
| 7757f09c | 26 | __u32 seg_max; |
| 48e4043d RH |
27 | /* geometry the device (if VIRTIO_BLK_F_GEOMETRY) */ |
| 28 | struct virtio_blk_geometry { | |
| 7757f09c | 29 | __u16 cylinders; |
| 48e4043d RH |
30 | __u8 heads; |
| 31 | __u8 sectors; | |
| 32 | } geometry; | |
| 066f4d82 CB |
33 | /* block size of device (if VIRTIO_BLK_F_BLK_SIZE) */ |
| 34 | __u32 blk_size; | |
| a586d4f6 | 35 | } __attribute__((packed)); |
| e467cde2 RR |
36 | |
| 37 | /* These two define direction. */ | |
| 38 | #define VIRTIO_BLK_T_IN 0 | |
| 39 | #define VIRTIO_BLK_T_OUT 1 | |
| 40 | ||
| 41 | /* This bit says it's a scsi command, not an actual read or write. */ | |
| 42 | #define VIRTIO_BLK_T_SCSI_CMD 2 | |
| 43 | ||
| 44 | /* Barrier before this op. */ | |
| 45 | #define VIRTIO_BLK_T_BARRIER 0x80000000 | |
| 46 | ||
| 47 | /* This is the first element of the read scatter-gather list. */ | |
| 48 | struct virtio_blk_outhdr | |
| 49 | { | |
| 50 | /* VIRTIO_BLK_T* */ | |
| 51 | __u32 type; | |
| 52 | /* io priority. */ | |
| 53 | __u32 ioprio; | |
| 54 | /* Sector (ie. 512 byte offset) */ | |
| 55 | __u64 sector; | |
| e467cde2 RR |
56 | }; |
| 57 | ||
| cb38fa23 | 58 | /* And this is the final byte of the write scatter-gather list. */ |
| e467cde2 RR |
59 | #define VIRTIO_BLK_S_OK 0 |
| 60 | #define VIRTIO_BLK_S_IOERR 1 | |
| 61 | #define VIRTIO_BLK_S_UNSUPP 2 | |
| e467cde2 | 62 | #endif /* _LINUX_VIRTIO_BLK_H */ |