The get lba status wrapper based on the bdrv_block_status. The following patches will add GET LBA STATUS 16 support for scsi emulation layer.
Signed-off-by: Lin Ma <l...@suse.com> --- block/io.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/block/io.c b/block/io.c index 121ce17a49..dacc3c2471 100644 --- a/block/io.c +++ b/block/io.c @@ -2186,6 +2186,49 @@ int coroutine_fn bdrv_co_pwrite_zeroes(BdrvChild *child, int64_t offset, BDRV_REQ_ZERO_WRITE | flags); } +int coroutine_fn +bdrv_co_get_lba_status(BdrvChild *child, int64_t offset, int64_t bytes, + uint32_t *num_blocks, uint32_t *is_deallocated) +{ + BlockDriverState *bs = child->bs; + int ret; + int64_t target_size, count = 0; + bool first = true; + uint8_t wanted_bit1 = 0; + + target_size = bdrv_getlength(bs); + if (target_size < 0) { + return -EIO; + } + + if (offset < 0 || bytes < 0) { + return -EIO; + } + + for ( ; offset <= target_size - bytes; offset += count) { + ret = bdrv_block_status(bs, offset, bytes, &count, NULL, NULL); + if (ret < 0) { + goto out; + } + if (first) { + if (ret & BDRV_BLOCK_ZERO) { + wanted_bit1 = BDRV_BLOCK_ZERO >> 1;; + *is_deallocated = 1; + } else { + wanted_bit1 = 0; + } + first = false; + } + if ((ret & BDRV_BLOCK_ZERO) >> 1 == wanted_bit1) { + (*num_blocks)++; + } else { + break; + } + } +out: + return ret; +} + /* * Flush ALL BDSes regardless of if they are reachable via a BlkBackend or not. */ -- 2.24.0