From: Eric Blake <ebl...@redhat.com>
We are gradually moving away from sector-based interfaces, towards
byte-based. Make the change for the last few sector-based callbacks
in the rbd driver.
Note that the driver was already using byte-based calls for
performing actual I/O, so this just gets rid of a round trip
of scaling; however, as I don't know if RBD is tolerant of
non-sector AIO operations, I went with the conservate approach
of adding .bdrv_refresh_limits to override the block layer
defaults back to the pre-patch value of 512.
Signed-off-by: Eric Blake <ebl...@redhat.com>
Signed-off-by: Kevin Wolf <kw...@redhat.com>
---
block/rbd.c | 40 ++++++++++++++++++++++------------------
1 file changed, 22 insertions(+), 18 deletions(-)
diff --git a/block/rbd.c b/block/rbd.c
index a14b42fcde..a16431e267 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -231,6 +231,13 @@ done:
}
+static void qemu_rbd_refresh_limits(BlockDriverState *bs, Error **errp)
+{
+ /* XXX Does RBD support AIO on less than 512-byte alignment? */
+ bs->bl.request_alignment = 512;
+}
+
+
static int qemu_rbd_set_auth(rados_t cluster, const char *secretid,
Error **errp)
{
@@ -899,27 +906,23 @@ failed:
return NULL;
}
-static BlockAIOCB *qemu_rbd_aio_readv(BlockDriverState *bs,
- int64_t sector_num,
- QEMUIOVector *qiov,
- int nb_sectors,
- BlockCompletionFunc *cb,
- void *opaque)
+static BlockAIOCB *qemu_rbd_aio_preadv(BlockDriverState *bs,
+ uint64_t offset, uint64_t bytes,
+ QEMUIOVector *qiov, int flags,
+ BlockCompletionFunc *cb,
+ void *opaque)
{
- return rbd_start_aio(bs, sector_num << BDRV_SECTOR_BITS, qiov,
- (int64_t) nb_sectors << BDRV_SECTOR_BITS, cb, opaque,
+ return rbd_start_aio(bs, offset, qiov, bytes, cb, opaque,
RBD_AIO_READ);
}
-static BlockAIOCB *qemu_rbd_aio_writev(BlockDriverState *bs,
- int64_t sector_num,
- QEMUIOVector *qiov,
- int nb_sectors,
- BlockCompletionFunc *cb,
- void *opaque)
+static BlockAIOCB *qemu_rbd_aio_pwritev(BlockDriverState *bs,
+ uint64_t offset, uint64_t bytes,
+ QEMUIOVector *qiov, int flags,
+ BlockCompletionFunc *cb,
+ void *opaque)
{
- return rbd_start_aio(bs, sector_num << BDRV_SECTOR_BITS, qiov,
- (int64_t) nb_sectors << BDRV_SECTOR_BITS, cb, opaque,
+ return rbd_start_aio(bs, offset, qiov, bytes, cb, opaque,
RBD_AIO_WRITE);
}
@@ -1158,6 +1161,7 @@ static BlockDriver bdrv_rbd = {
.format_name = "rbd",
.instance_size = sizeof(BDRVRBDState),
.bdrv_parse_filename = qemu_rbd_parse_filename,
+ .bdrv_refresh_limits = qemu_rbd_refresh_limits,
.bdrv_file_open = qemu_rbd_open,
.bdrv_close = qemu_rbd_close,
.bdrv_reopen_prepare = qemu_rbd_reopen_prepare,
@@ -1170,8 +1174,8 @@ static BlockDriver bdrv_rbd = {
.bdrv_truncate = qemu_rbd_truncate,
.protocol_name = "rbd",
- .bdrv_aio_readv = qemu_rbd_aio_readv,
- .bdrv_aio_writev = qemu_rbd_aio_writev,
+ .bdrv_aio_preadv = qemu_rbd_aio_preadv,
+ .bdrv_aio_pwritev = qemu_rbd_aio_pwritev,
#ifdef LIBRBD_SUPPORTS_AIO_FLUSH
.bdrv_aio_flush = qemu_rbd_aio_flush,
--
2.13.6
