diff options
| author | Eric Blake <eblake@redhat.com> | 2016-05-06 10:26:27 -0600 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2016-05-12 15:22:08 +0200 |
| commit | 8341f00dc207b80a1b2e7c7784890c9b0446d062 (patch) | |
| tree | e2ff324dc93b8b03a5dff95e6fd576116591aad3 /include | |
| parent | 0e01b76e7cc43068f6b8cc05297f61539ccd5279 (diff) | |
| download | qemu-8341f00dc207b80a1b2e7c7784890c9b0446d062.zip | |
block: Allow BDRV_REQ_FUA through blk_pwrite()
We have several block drivers that understand BDRV_REQ_FUA,
and emulate it in the block layer for the rest by a full flush.
But without a way to actually request BDRV_REQ_FUA during a
pass-through blk_pwrite(), FUA-aware block drivers like NBD are
forced to repeat the emulation logic of a full flush regardless
of whether the backend they are writing to could do it more
efficiently.
This patch just wires up a flags argument; followup patches
will actually make use of it in the NBD driver and in qemu-io.
Signed-off-by: Eric Blake <eblake@redhat.com>
Acked-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/sysemu/block-backend.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h index c62b6fe96d..6991b2610c 100644 --- a/include/sysemu/block-backend.h +++ b/include/sysemu/block-backend.h @@ -102,7 +102,8 @@ BlockAIOCB *blk_aio_write_zeroes(BlockBackend *blk, int64_t sector_num, int nb_sectors, BdrvRequestFlags flags, BlockCompletionFunc *cb, void *opaque); int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count); -int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count); +int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count, + BdrvRequestFlags flags); int64_t blk_getlength(BlockBackend *blk); void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr); int64_t blk_nb_sectors(BlockBackend *blk); |