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vhost-user-blk: add discard/write zeroes features support

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Linux commit 1f23816b8 "virtio_blk: add discard and write zeroes support"
added the support in the Guest kernel, while here also enable the features
support with vhost-user-blk driver. Also enable the test example utility
with DISCARD and WRITE ZEROES commands.

Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Changpeng Liu 2019-01-16 13:19:30 +08:00 • committed by Michael S. Tsirkin
parent a56de056c9
commit caa1ee4313
3 changed files with 159 additions and 33 deletions
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48
include/standard-headers/linux/virtio_blk.h
View file

@ -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;
/*
@ -137,6 +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;