3ef5360954
Hello Rusty, sometimes it is useful to share a disk (e.g. usr). To avoid file system corruption, the disk should be mounted read-only in that case. This patch adds a new feature flag, that allows the host to specify, if the disk should be considered read-only. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
#ifndef _LINUX_VIRTIO_BLK_H
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#define _LINUX_VIRTIO_BLK_H
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#include <linux/virtio_config.h>
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/* The ID for virtio_block */
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#define VIRTIO_ID_BLOCK 2
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/* Feature bits */
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#define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */
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#define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */
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#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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struct virtio_blk_config
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{
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/* The capacity (in 512-byte sectors). */
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__le64 capacity;
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/* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */
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__le32 size_max;
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/* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */
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__le32 seg_max;
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/* geometry the device (if VIRTIO_BLK_F_GEOMETRY) */
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struct virtio_blk_geometry {
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__le16 cylinders;
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__u8 heads;
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__u8 sectors;
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} geometry;
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} __attribute__((packed));
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/* These two define direction. */
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#define VIRTIO_BLK_T_IN 0
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#define VIRTIO_BLK_T_OUT 1
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/* This bit says it's a scsi command, not an actual read or write. */
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#define VIRTIO_BLK_T_SCSI_CMD 2
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/* Barrier before this op. */
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#define VIRTIO_BLK_T_BARRIER 0x80000000
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/* This is the first element of the read scatter-gather list. */
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struct virtio_blk_outhdr
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{
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/* VIRTIO_BLK_T* */
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__u32 type;
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/* io priority. */
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__u32 ioprio;
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/* Sector (ie. 512 byte offset) */
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__u64 sector;
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};
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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
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#define VIRTIO_BLK_S_IOERR 1
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#define VIRTIO_BLK_S_UNSUPP 2
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#endif /* _LINUX_VIRTIO_BLK_H */
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