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include/linux/virtio_blk.h
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#ifndef _LINUX_VIRTIO_BLK_H #define _LINUX_VIRTIO_BLK_H |
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/* This header is BSD licensed so anyone can use the definitions to implement * compatible drivers/servers. */ |
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#include <linux/types.h> |
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#include <linux/virtio_ids.h> |
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#include <linux/virtio_config.h> |
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/* Feature bits */ |
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#define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ #define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */ #define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */ |
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#define VIRTIO_BLK_F_GEOMETRY 4 /* Legacy geometry available */ |
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#define VIRTIO_BLK_F_RO 5 /* Disk is read-only */ |
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#define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/ |
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#define VIRTIO_BLK_F_SCSI 7 /* Supports scsi command passthru */ |
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#define VIRTIO_BLK_F_FLUSH 9 /* Cache flush command support */ |
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#define VIRTIO_BLK_F_TOPOLOGY 10 /* Topology information is available */ |
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#define VIRTIO_BLK_ID_BYTES 20 /* ID string length */ |
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struct virtio_blk_config { |
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/* The capacity (in 512-byte sectors). */ |
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__u64 capacity; |
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/* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */ |
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__u32 size_max; |
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/* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */ |
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__u32 seg_max; |
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/* geometry the device (if VIRTIO_BLK_F_GEOMETRY) */ struct virtio_blk_geometry { |
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__u16 cylinders; |
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__u8 heads; __u8 sectors; } geometry; |
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/* block size of device (if VIRTIO_BLK_F_BLK_SIZE) */ __u32 blk_size; |
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/* the next 4 entries are guarded by VIRTIO_BLK_F_TOPOLOGY */ /* exponent for physical block per logical block. */ __u8 physical_block_exp; /* alignment offset in logical blocks. */ __u8 alignment_offset; /* minimum I/O size without performance penalty in logical blocks. */ __u16 min_io_size; /* optimal sustained I/O size in logical blocks. */ __u32 opt_io_size; |
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} __attribute__((packed)); |
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/* * Command types * * Usage is a bit tricky as some bits are used as flags and some are not. * * Rules: * VIRTIO_BLK_T_OUT may be combined with VIRTIO_BLK_T_SCSI_CMD or * VIRTIO_BLK_T_BARRIER. VIRTIO_BLK_T_FLUSH is a command of its own * and may not be combined with any of the other flags. */ |
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/* These two define direction. */ #define VIRTIO_BLK_T_IN 0 #define VIRTIO_BLK_T_OUT 1 /* This bit says it's a scsi command, not an actual read or write. */ #define VIRTIO_BLK_T_SCSI_CMD 2 |
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/* Cache flush command */ #define VIRTIO_BLK_T_FLUSH 4 |
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/* Get device ID command */ #define VIRTIO_BLK_T_GET_ID 8 |
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/* Barrier before this op. */ #define VIRTIO_BLK_T_BARRIER 0x80000000 /* This is the first element of the read scatter-gather list. */ |
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struct virtio_blk_outhdr { |
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/* VIRTIO_BLK_T* */ __u32 type; /* io priority. */ __u32 ioprio; /* Sector (ie. 512 byte offset) */ __u64 sector; |
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}; |
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struct virtio_scsi_inhdr { __u32 errors; __u32 data_len; __u32 sense_len; __u32 residual; }; |
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/* And this is the final byte of the write scatter-gather list. */ |
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#define VIRTIO_BLK_S_OK 0 #define VIRTIO_BLK_S_IOERR 1 #define VIRTIO_BLK_S_UNSUPP 2 |
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#endif /* _LINUX_VIRTIO_BLK_H */ |