diff options
| author | Peter Lieven <pl@kamp.de> | 2013-10-24 12:06:53 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2013-11-28 10:30:51 +0100 |
| commit | e1a5c4bed44bc23f69f53883c657e31e150cab30 (patch) | |
| tree | 7930cbe06c27539d64a9a0f40a127c21dcf46a94 | |
| parent | d32f35cbc5a87af5e1100dd55074a79fc2cb5307 (diff) | |
block: add logical block provisioning info to BlockDriverInfo
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
| -rw-r--r-- | include/block/block.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/block/block.h b/include/block/block.h index 1f30a56fb0..9c76967104 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -18,6 +18,22 @@ typedef struct BlockDriverInfo { /* offset at which the VM state can be saved (0 if not possible) */ int64_t vm_state_offset; bool is_dirty; + /* + * True if unallocated blocks read back as zeroes. This is equivalent + * to the the LBPRZ flag in the SCSI logical block provisioning page. + */ + bool unallocated_blocks_are_zero; + /* + * True if the driver can optimize writing zeroes by unmapping + * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux + * with the difference that in qemu a discard is allowed to silently + * fail. Therefore we have to use bdrv_write_zeroes with the + * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping. + * After this call the driver has to guarantee that the contents read + * back as zero. It is additionally required that the block device is + * opened with BDRV_O_UNMAP flag for this to work. + */ + bool can_write_zeroes_with_unmap; } BlockDriverInfo; typedef struct BlockFragInfo { |