diff options
Diffstat (limited to 'include/standard-headers/linux/virtio_blk.h')
| -rw-r--r-- | include/standard-headers/linux/virtio_blk.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/include/standard-headers/linux/virtio_blk.h b/include/standard-headers/linux/virtio_blk.h index ab16ec5fd2..0229b0fbe4 100644 --- a/include/standard-headers/linux/virtio_blk.h +++ b/include/standard-headers/linux/virtio_blk.h @@ -38,6 +38,8 @@ #define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/ #define VIRTIO_BLK_F_TOPOLOGY 10 /* Topology information is available */ #define VIRTIO_BLK_F_MQ 12 /* support more than one vq */ +#define VIRTIO_BLK_F_DISCARD 13 /* DISCARD is supported */ +#define VIRTIO_BLK_F_WRITE_ZEROES 14 /* WRITE ZEROES is supported */ /* Legacy feature bits */ #ifndef VIRTIO_BLK_NO_LEGACY @@ -84,6 +86,39 @@ struct virtio_blk_config { /* number of vqs, only available when VIRTIO_BLK_F_MQ is set */ uint16_t num_queues; + + /* the next 3 entries are guarded by VIRTIO_BLK_F_DISCARD */ + /* + * The maximum discard sectors (in 512-byte sectors) for + * one segment. + */ + uint32_t max_discard_sectors; + /* + * The maximum number of discard segments in a + * discard command. + */ + uint32_t max_discard_seg; + /* Discard commands must be aligned to this number of sectors. */ + uint32_t discard_sector_alignment; + + /* the next 3 entries are guarded by VIRTIO_BLK_F_WRITE_ZEROES */ + /* + * The maximum number of write zeroes sectors (in 512-byte sectors) in + * one segment. + */ + uint32_t max_write_zeroes_sectors; + /* + * The maximum number of segments in a write zeroes + * command. + */ + uint32_t max_write_zeroes_seg; + /* + * Set if a VIRTIO_BLK_T_WRITE_ZEROES request may result in the + * deallocation of one or more of the sectors. + */ + uint8_t write_zeroes_may_unmap; + + uint8_t unused1[3]; } QEMU_PACKED; /* @@ -112,6 +147,12 @@ struct virtio_blk_config { /* Get device ID command */ #define VIRTIO_BLK_T_GET_ID 8 +/* Discard command */ +#define VIRTIO_BLK_T_DISCARD 11 + +/* Write zeroes command */ +#define VIRTIO_BLK_T_WRITE_ZEROES 13 + #ifndef VIRTIO_BLK_NO_LEGACY /* Barrier before this op. */ #define VIRTIO_BLK_T_BARRIER 0x80000000 @@ -131,6 +172,19 @@ struct virtio_blk_outhdr { __virtio64 sector; }; +/* Unmap this range (only valid for write zeroes command) */ +#define VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP 0x00000001 + +/* Discard/write zeroes range for each request. */ +struct virtio_blk_discard_write_zeroes { + /* discard/write zeroes start sector */ + uint64_t sector; + /* number of discard/write zeroes sectors */ + uint32_t num_sectors; + /* flags for this range */ + uint32_t flags; +}; + #ifndef VIRTIO_BLK_NO_LEGACY struct virtio_scsi_inhdr { __virtio32 errors; |