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block: Add sparse operations capability query

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Add capability query to DiskFile trait to check backend
support for sparse operations (punch hole, write zeroes,
discard). Only advertise VIRTIO_BLK_F_DISCARD and
VIRTIO_BLK_F_WRITE_ZEROES when the backend supports these
operations.

Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
This commit is contained in:
Anatol Belski
2026-01-29 21:49:42 +01:00
committed by Rob Bradford
parent d5dad48618
commit 7f4b56b217
6 changed files with 32 additions and 3 deletions
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7
virtio-devices/src/block.rs
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@@ -702,6 +702,13 @@ impl Block {
| (1u64 << VIRTIO_BLK_F_SEG_MAX)
| (1u64 << VIRTIO_RING_F_EVENT_IDX)
| (1u64 << VIRTIO_RING_F_INDIRECT_DESC);
// Only advertise discard/write zeroes if the backend supports sparse operations
if disk_image.supports_sparse_operations() {
avail_features |=
(1u64 << VIRTIO_BLK_F_DISCARD) | (1u64 << VIRTIO_BLK_F_WRITE_ZEROES);
}
if iommu {
avail_features |= 1u64 << VIRTIO_F_IOMMU_PLATFORM;
}