diff options
| author | Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> | 2011-11-14 12:44:19 +0000 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2011-12-05 14:51:36 +0100 |
| commit | 376ae3f1cb5a08f53c9425bfaf90b3f70ab240f1 (patch) | |
| tree | f66c28d20b2756d4768551c711b5697ac8bfaf5a /block_int.h | |
| parent | 05c4af54c670f5143bd4ac5d79aa1ef53a9f31ca (diff) | |
block: add .bdrv_co_is_allocated()
This patch adds the .bdrv_co_is_allocated() interface which is identical
to .bdrv_is_allocated() but runs in coroutine context. Running in
coroutine context implies that other coroutines might be performing I/O
at the same time. Therefore it must be safe to run while the following
BlockDriver functions are in-flight:
.bdrv_co_readv()
.bdrv_co_writev()
.bdrv_co_flush()
.bdrv_co_is_allocated()
The new .bdrv_co_is_allocated() interface is useful because it can be
used when a VM is running, whereas .bdrv_is_allocated() is a synchronous
interface that does not cope with parallel requests.
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block_int.h')
| -rw-r--r-- | block_int.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/block_int.h b/block_int.h index e2799e4f6b..d5b5457d90 100644 --- a/block_int.h +++ b/block_int.h @@ -103,6 +103,8 @@ struct BlockDriver { int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); int coroutine_fn (*bdrv_co_discard)(BlockDriverState *bs, int64_t sector_num, int nb_sectors); + int coroutine_fn (*bdrv_co_is_allocated)(BlockDriverState *bs, + int64_t sector_num, int nb_sectors, int *pnum); /* * Invalidate any cached meta-data. |