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block: add logical block provisioning info to BlockDriverInfo

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Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Peter Lieven 2013-10-24 12:06:53 +02:00 committed by Kevin Wolf
parent d32f35cbc5
commit e1a5c4bed4
1 changed files with 16 additions and 0 deletions
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16
include/block/block.h
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@ -18,6 +18,22 @@ typedef struct BlockDriverInfo {
/* offset at which the VM state can be saved (0 if not possible) */ /* offset at which the VM state can be saved (0 if not possible) */
int64_t vm_state_offset; int64_t vm_state_offset;
bool is_dirty; 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; } BlockDriverInfo;
typedef struct BlockFragInfo { typedef struct BlockFragInfo {