diff options
| author | Peter Lieven <pl@kamp.de> | 2013-10-24 12:07:03 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2013-11-28 10:30:52 +0100 |
| commit | d75cbb5e68f5a7d64248ba89399a7f2073231de5 (patch) | |
| tree | 16296a172363a83acc43298de189ffbc0d5aa413 /include/block | |
| parent | d4cd961507e6f013fd0f9b1dc609f15ed2aaa40d (diff) | |
block: introduce bdrv_make_zero
this patch adds a call to completely zero out a block device.
the operation is sped up by checking the block status and
only writing zeroes to the device if they currently do not
return zeroes. optionally the zero writing can be sped up
by setting the flag BDRV_REQ_MAY_UNMAP to emulate the zero
write by unmapping if the driver supports it.
Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'include/block')
| -rw-r--r-- | include/block/block.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/block/block.h b/include/block/block.h index 803c5caceb..4d9e67c7eb 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -216,6 +216,7 @@ int bdrv_write(BlockDriverState *bs, int64_t sector_num, const uint8_t *buf, int nb_sectors); int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, int nb_sectors, BdrvRequestFlags flags); +int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags); int bdrv_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov); int bdrv_pread(BlockDriverState *bs, int64_t offset, void *buf, int count); |