#ifndef _LINUX_VIRTIO_BLK_H
#define _LINUX_VIRTIO_BLK_H
+/* This header is BSD licensed so anyone can use the definitions to implement
+ * compatible drivers/servers. */
+#include <linux/types.h>
+#include <linux/virtio_ids.h>
#include <linux/virtio_config.h>
-/* The ID for virtio_block */
-#define VIRTIO_ID_BLOCK 2
-
/* Feature bits */
#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 */
+#define VIRTIO_BLK_F_GEOMETRY 4 /* Legacy geometry available */
+#define VIRTIO_BLK_F_RO 5 /* Disk is read-only */
+#define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/
+#define VIRTIO_BLK_F_SCSI 7 /* Supports scsi command passthru */
+#define VIRTIO_BLK_F_FLUSH 9 /* Cache flush command support */
-struct virtio_blk_config
-{
+struct virtio_blk_config {
/* The capacity (in 512-byte sectors). */
- __le64 capacity;
+ __u64 capacity;
/* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */
- __le32 size_max;
+ __u32 size_max;
/* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */
- __le32 seg_max;
+ __u32 seg_max;
+ /* geometry the device (if VIRTIO_BLK_F_GEOMETRY) */
+ struct virtio_blk_geometry {
+ __u16 cylinders;
+ __u8 heads;
+ __u8 sectors;
+ } geometry;
+ /* block size of device (if VIRTIO_BLK_F_BLK_SIZE) */
+ __u32 blk_size;
} __attribute__((packed));
+/*
+ * 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.
+ */
+
/* 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
+/* Cache flush command */
+#define VIRTIO_BLK_T_FLUSH 4
+
/* Barrier before this op. */
#define VIRTIO_BLK_T_BARRIER 0x80000000
/* This is the first element of the read scatter-gather list. */
-struct virtio_blk_outhdr
-{
+struct virtio_blk_outhdr {
/* VIRTIO_BLK_T* */
__u32 type;
/* io priority. */
__u64 sector;
};
+struct virtio_scsi_inhdr {
+ __u32 errors;
+ __u32 data_len;
+ __u32 sense_len;
+ __u32 residual;
+};
+
+/* And this is the final byte of the write scatter-gather list. */
#define VIRTIO_BLK_S_OK 0
#define VIRTIO_BLK_S_IOERR 1
#define VIRTIO_BLK_S_UNSUPP 2
-
-/* This is the first element of the write scatter-gather list */
-struct virtio_blk_inhdr
-{
- unsigned char status;
-};
#endif /* _LINUX_VIRTIO_BLK_H */