diff options
Diffstat (limited to 'drivers/virtio/virtio_blk.h')
| -rw-r--r-- | drivers/virtio/virtio_blk.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_blk.h b/drivers/virtio/virtio_blk.h index 8d8e02fa2ea..b37ba264df4 100644 --- a/drivers/virtio/virtio_blk.h +++ b/drivers/virtio/virtio_blk.h @@ -17,6 +17,8 @@ #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 @@ -65,6 +67,39 @@ struct __packed virtio_blk_config { /* number of vqs, only available when VIRTIO_BLK_F_MQ is set */ __u16 num_queues; + + /* the next 3 entries are guarded by VIRTIO_BLK_F_DISCARD */ + /* + * The maximum discard sectors (in 512-byte sectors) for + * one segment. + */ + __u32 max_discard_sectors; + /* + * The maximum number of discard segments in a + * discard command. + */ + __u32 max_discard_seg; + /* Discard commands must be aligned to this number of sectors. */ + __u32 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. + */ + __u32 max_write_zeroes_sectors; + /* + * The maximum number of segments in a write zeroes + * command. + */ + __u32 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. + */ + __u8 write_zeroes_may_unmap; + + __u8 unused1[3]; }; /* @@ -93,6 +128,9 @@ struct __packed virtio_blk_config { /* Get device ID command */ #define VIRTIO_BLK_T_GET_ID 8 +/* 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 @@ -112,6 +150,15 @@ struct virtio_blk_outhdr { __virtio64 sector; }; +struct virtio_blk_discard_write_zeroes { + /* discard/write zeroes start sector */ + __virtio64 sector; + /* number of discard/write zeroes sectors */ + __virtio32 num_sectors; + /* flags for this range */ + __virtio32 flags; +}; + #ifndef VIRTIO_BLK_NO_LEGACY struct virtio_scsi_inhdr { __virtio32 errors; |