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qed: Convert to bdrv_co_pwrite_zeroes()

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Another step on our continuing quest to switch to byte-based
interfaces.

Kill an abuse of the comma operator while at it (fortunately,
the semantics were still right).  Also, the test for requests
not aligned to clusters should be applied always, not just
when a backing file is present.

Signed-off-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2016-06-01 15:10:09 -06:00 committed by Kevin Wolf
parent e88a36ebad
commit 49a2e48348
1 changed files with 15 additions and 18 deletions
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33
block/qed.c
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@ -1418,7 +1418,7 @@ typedef struct {
bool done;
} QEDWriteZeroesCB;
static void coroutine_fn qed_co_write_zeroes_cb(void *opaque, int ret)
static void coroutine_fn qed_co_pwrite_zeroes_cb(void *opaque, int ret)
{
QEDWriteZeroesCB *cb = opaque;
@ -1429,10 +1429,10 @@ static void coroutine_fn qed_co_write_zeroes_cb(void *opaque, int ret)
}
}
static int coroutine_fn bdrv_qed_co_write_zeroes(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors,
BdrvRequestFlags flags)
static int coroutine_fn bdrv_qed_co_pwrite_zeroes(BlockDriverState *bs,
int64_t offset,
int count,
BdrvRequestFlags flags)
{
BlockAIOCB *blockacb;
BDRVQEDState *s = bs->opaque;
@ -1440,25 +1440,22 @@ static int coroutine_fn bdrv_qed_co_write_zeroes(BlockDriverState *bs,
QEMUIOVector qiov;
struct iovec iov;
/* Refuse if there are untouched backing file sectors */
if (bs->backing) {
if (qed_offset_into_cluster(s, sector_num * BDRV_SECTOR_SIZE) != 0) {
return -ENOTSUP;
}
if (qed_offset_into_cluster(s, nb_sectors * BDRV_SECTOR_SIZE) != 0) {
return -ENOTSUP;
}
/* Fall back if the request is not aligned */
if (qed_offset_into_cluster(s, offset) ||
qed_offset_into_cluster(s, count)) {
return -ENOTSUP;
}
/* Zero writes start without an I/O buffer. If a buffer becomes necessary
* then it will be allocated during request processing.
*/
iov.iov_base = NULL,
iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE,
iov.iov_base = NULL;
iov.iov_len = count;
qemu_iovec_init_external(&qiov, &iov, 1);
blockacb = qed_aio_setup(bs, sector_num, &qiov, nb_sectors,
qed_co_write_zeroes_cb, &cb,
blockacb = qed_aio_setup(bs, offset >> BDRV_SECTOR_BITS, &qiov,
count >> BDRV_SECTOR_BITS,
qed_co_pwrite_zeroes_cb, &cb,
QED_AIOCB_WRITE | QED_AIOCB_ZERO);
if (!blockacb) {
return -EIO;
@ -1663,7 +1660,7 @@ static BlockDriver bdrv_qed = {
.bdrv_co_get_block_status = bdrv_qed_co_get_block_status,
.bdrv_aio_readv = bdrv_qed_aio_readv,
.bdrv_aio_writev = bdrv_qed_aio_writev,
.bdrv_co_write_zeroes = bdrv_qed_co_write_zeroes,
.bdrv_co_pwrite_zeroes = bdrv_qed_co_pwrite_zeroes,
.bdrv_truncate = bdrv_qed_truncate,
.bdrv_getlength = bdrv_qed_getlength,
.bdrv_get_info = bdrv_qed_get_info,