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author | Michael Tokarev <mjt@tls.msk.ru> | 2012-06-07 20:17:55 +0400 |
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committer | Michael Tokarev <mjt@tls.msk.ru> | 2012-06-11 23:12:11 +0400 |
commit | 03396148bca54c0e81ad8eecb12a136456d14c16 (patch) | |
tree | aad331d0a44982f2d0ab7bd5feba8a19d4d046e2 /block.c | |
parent | 3d9b49254f893f2a3739400e536de25db1cdc5f9 (diff) | |
download | qemu-03396148bca54c0e81ad8eecb12a136456d14c16.zip qemu-03396148bca54c0e81ad8eecb12a136456d14c16.tar.gz qemu-03396148bca54c0e81ad8eecb12a136456d14c16.tar.bz2 |
allow qemu_iovec_from_buffer() to specify offset from which to start copying
Similar to
qemu_iovec_memset(QEMUIOVector *qiov, size_t offset,
int c, size_t bytes);
the new prototype is:
qemu_iovec_from_buf(QEMUIOVector *qiov, size_t offset,
const void *buf, size_t bytes);
The processing starts at offset bytes within qiov.
This way, we may copy a bounce buffer directly to
a middle of qiov.
This is exactly the same function as iov_from_buf() from
iov.c, so use the existing implementation and rename it
to qemu_iovec_from_buf() to be shorter and to match the
utility function.
As with utility implementation, we now assert that the
offset is inside actual iovec. Nothing changed for
current callers, because `offset' parameter is new.
While at it, stop using "bounce-qiov" in block/qcow2.c
and copy decrypted data directly from cluster_data
instead of recreating a temp qiov for doing that.
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Diffstat (limited to 'block.c')
-rw-r--r-- | block.c | 6 |
1 files changed, 3 insertions, 3 deletions
@@ -1821,8 +1821,8 @@ static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, } skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; - qemu_iovec_from_buffer(qiov, bounce_buffer + skip_bytes, - nb_sectors * BDRV_SECTOR_SIZE); + qemu_iovec_from_buf(qiov, 0, bounce_buffer + skip_bytes, + nb_sectors * BDRV_SECTOR_SIZE); err: qemu_vfree(bounce_buffer); @@ -3382,7 +3382,7 @@ static void bdrv_aio_bh_cb(void *opaque) BlockDriverAIOCBSync *acb = opaque; if (!acb->is_write) - qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); + qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size); qemu_vfree(acb->bounce); acb->common.cb(acb->common.opaque, acb->ret); qemu_bh_delete(acb->bh); |