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stream: Use BlockBackend for I/O

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This changes the streaming block job to use the job's BlockBackend for
performing the COR reads. job->bs isn't used by the streaming code any
more afterwards.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Kevin Wolf 2016-04-12 15:15:49 +02:00
parent 1e98fefd95
commit 03e35d820d
4 changed files with 9 additions and 18 deletions
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9
block/io.c
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@ -1117,15 +1117,6 @@ int coroutine_fn bdrv_co_readv_no_serialising(BlockDriverState *bs,
BDRV_REQ_NO_SERIALISING);
}
int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
{
trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors);
return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov,
BDRV_REQ_COPY_ON_READ);
}
#define MAX_WRITE_ZEROES_BOUNCE_BUFFER 32768
static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs,

15
block/stream.c
View File

@ -39,7 +39,7 @@ typedef struct StreamBlockJob {
char *backing_file_str;
} StreamBlockJob;
static int coroutine_fn stream_populate(BlockDriverState *bs,
static int coroutine_fn stream_populate(BlockBackend *blk,
int64_t sector_num, int nb_sectors,
void *buf)
{
@ -52,7 +52,8 @@ static int coroutine_fn stream_populate(BlockDriverState *bs,
qemu_iovec_init_external(&qiov, &iov, 1);
/* Copy-on-read the unallocated clusters */
return bdrv_co_copy_on_readv(bs, sector_num, nb_sectors, &qiov);
return blk_co_preadv(blk, sector_num * BDRV_SECTOR_SIZE, qiov.size, &qiov,
BDRV_REQ_COPY_ON_READ);
}
typedef struct {
@ -64,6 +65,7 @@ static void stream_complete(BlockJob *job, void *opaque)
{
StreamBlockJob *s = container_of(job, StreamBlockJob, common);
StreamCompleteData *data = opaque;
BlockDriverState *bs = blk_bs(job->blk);
BlockDriverState *base = s->base;
if (!block_job_is_cancelled(&s->common) && data->reached_end &&
@ -75,8 +77,8 @@ static void stream_complete(BlockJob *job, void *opaque)
base_fmt = base->drv->format_name;
}
}
data->ret = bdrv_change_backing_file(job->bs, base_id, base_fmt);
bdrv_set_backing_hd(job->bs, base);
data->ret = bdrv_change_backing_file(bs, base_id, base_fmt);
bdrv_set_backing_hd(bs, base);
}
g_free(s->backing_file_str);
@ -88,7 +90,8 @@ static void coroutine_fn stream_run(void *opaque)
{
StreamBlockJob *s = opaque;
StreamCompleteData *data;
BlockDriverState *bs = s->common.bs;
BlockBackend *blk = s->common.blk;
BlockDriverState *bs = blk_bs(blk);
BlockDriverState *base = s->base;
int64_t sector_num = 0;
int64_t end = -1;
@ -159,7 +162,7 @@ wait:
goto wait;
}
}
ret = stream_populate(bs, sector_num, n, buf);
ret = stream_populate(blk, sector_num, n, buf);
}
if (ret < 0) {
BlockErrorAction action =

2
include/block/block.h
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@ -242,8 +242,6 @@ int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
const void *buf, int count);
int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov);
int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
int coroutine_fn bdrv_co_readv_no_serialising(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,

1
trace-events
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@ -72,7 +72,6 @@ bdrv_aio_readv(void *bs, int64_t sector_num, int nb_sectors, void *opaque) "bs %
bdrv_aio_writev(void *bs, int64_t sector_num, int nb_sectors, void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
bdrv_aio_write_zeroes(void *bs, int64_t sector_num, int nb_sectors, int flags, void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d flags %#x opaque %p"
bdrv_co_readv(void *bs, int64_t sector_num, int nb_sector) "bs %p sector_num %"PRId64" nb_sectors %d"
bdrv_co_copy_on_readv(void *bs, int64_t sector_num, int nb_sector) "bs %p sector_num %"PRId64" nb_sectors %d"
bdrv_co_readv_no_serialising(void *bs, int64_t sector_num, int nb_sector) "bs %p sector_num %"PRId64" nb_sectors %d"
bdrv_co_writev(void *bs, int64_t sector_num, int nb_sector) "bs %p sector_num %"PRId64" nb_sectors %d"
bdrv_co_write_zeroes(void *bs, int64_t sector_num, int nb_sector, int flags) "bs %p sector_num %"PRId64" nb_sectors %d flags %#x"