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block: Convert bs->backing_hd to BdrvChild

Browse source 
This is the final step in converting all of the BlockDriverState
pointers that block drivers use to BdrvChild.

After this patch, bs->children contains the full list of child nodes
that are referenced by a given BDS, and these children are only
referenced through BdrvChild, so that updating the pointer in there is
enough for changing edges in the graph.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2015-06-17 14:55:21 +02:00
parent b26e90f56a
commit 760e006384
14 changed files with 115 additions and 109 deletions
Download patch file Download diff file Expand all files Collapse all files

24
block/io.c
View file

@ -170,24 +170,24 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
bs->bl.opt_mem_alignment = getpagesize();
}
if (bs->backing_hd) {
bdrv_refresh_limits(bs->backing_hd, &local_err);
if (bs->backing) {
bdrv_refresh_limits(bs->backing->bs, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
bs->bl.opt_transfer_length =
MAX(bs->bl.opt_transfer_length,
bs->backing_hd->bl.opt_transfer_length);
bs->backing->bs->bl.opt_transfer_length);
bs->bl.max_transfer_length =
MIN_NON_ZERO(bs->bl.max_transfer_length,
bs->backing_hd->bl.max_transfer_length);
bs->backing->bs->bl.max_transfer_length);
bs->bl.opt_mem_alignment =
MAX(bs->bl.opt_mem_alignment,
bs->backing_hd->bl.opt_mem_alignment);
bs->backing->bs->bl.opt_mem_alignment);
bs->bl.min_mem_alignment =
MAX(bs->bl.min_mem_alignment,
bs->backing_hd->bl.min_mem_alignment);
bs->backing->bs->bl.min_mem_alignment);
}
/* Then let the driver override it */
@ -227,7 +227,7 @@ static bool bdrv_requests_pending(BlockDriverState *bs)
if (bs->file && bdrv_requests_pending(bs->file->bs)) {
return true;
}
if (bs->backing_hd && bdrv_requests_pending(bs->backing_hd)) {
if (bs->backing && bdrv_requests_pending(bs->backing->bs)) {
return true;
}
return false;
@ -1505,8 +1505,8 @@ static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs,
} else {
if (bdrv_unallocated_blocks_are_zero(bs)) {
ret |= BDRV_BLOCK_ZERO;
} else if (bs->backing_hd) {
BlockDriverState *bs2 = bs->backing_hd;
} else if (bs->backing) {
BlockDriverState *bs2 = bs->backing->bs;
int64_t nb_sectors2 = bdrv_nb_sectors(bs2);
if (nb_sectors2 >= 0 && sector_num >= nb_sectors2) {
ret |= BDRV_BLOCK_ZERO;
@ -1551,7 +1551,7 @@ static int64_t coroutine_fn bdrv_co_get_block_status_above(BlockDriverState *bs,
int64_t ret = 0;
assert(bs != base);
for (p = bs; p != base; p = p->backing_hd) {
for (p = bs; p != base; p = backing_bs(p)) {
ret = bdrv_co_get_block_status(p, sector_num, nb_sectors, pnum);
if (ret < 0 || ret & BDRV_BLOCK_ALLOCATED) {
break;
@ -1614,7 +1614,7 @@ int64_t bdrv_get_block_status(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors, int *pnum)
{
return bdrv_get_block_status_above(bs, bs->backing_hd,
return bdrv_get_block_status_above(bs, backing_bs(bs),
sector_num, nb_sectors, pnum);
}
@ -1672,7 +1672,7 @@ int bdrv_is_allocated_above(BlockDriverState *top,
n = pnum_inter;
}
intermediate = intermediate->backing_hd;
intermediate = backing_bs(intermediate);
}
*pnum = n;

6
block/mirror.c
View file

@ -371,7 +371,7 @@ static void mirror_exit(BlockJob *job, void *opaque)
if (s->common.driver->job_type == BLOCK_JOB_TYPE_COMMIT) {
/* drop the bs loop chain formed by the swap: break the loop then
* trigger the unref from the top one */
BlockDriverState *p = s->base->backing_hd;
BlockDriverState *p = backing_bs(s->base);
bdrv_set_backing_hd(s->base, NULL);
bdrv_unref(p);
}
@ -431,7 +431,7 @@ static void coroutine_fn mirror_run(void *opaque)
*/
bdrv_get_backing_filename(s->target, backing_filename,
sizeof(backing_filename));
if (backing_filename[0] && !s->target->backing_hd) {
if (backing_filename[0] && !s->target->backing) {
ret = bdrv_get_info(s->target, &bdi);
if (ret < 0) {
goto immediate_exit;
@ -766,7 +766,7 @@ void mirror_start(BlockDriverState *bs, BlockDriverState *target,
return;
}
is_none_mode = mode == MIRROR_SYNC_MODE_NONE;
base = mode == MIRROR_SYNC_MODE_TOP ? bs->backing_hd : NULL;
base = mode == MIRROR_SYNC_MODE_TOP ? backing_bs(bs) : NULL;
mirror_start_job(bs, target, replaces,
speed, granularity, buf_size,
on_source_error, on_target_error, unmap, cb, opaque, errp,

8
block/qapi.c
View file

@ -110,8 +110,8 @@ BlockDeviceInfo *bdrv_block_device_info(BlockDriverState *bs, Error **errp)
qapi_free_BlockDeviceInfo(info);
return NULL;
}
if (bs0->drv && bs0->backing_hd) {
bs0 = bs0->backing_hd;
if (bs0->drv && bs0->backing) {
bs0 = bs0->backing->bs;
(*p_image_info)->has_backing_image = true;
p_image_info = &((*p_image_info)->backing_image);
} else {
@ -362,9 +362,9 @@ static BlockStats *bdrv_query_stats(const BlockDriverState *bs,
s->parent = bdrv_query_stats(bs->file->bs, query_backing);
}
if (query_backing && bs->backing_hd) {
if (query_backing && bs->backing) {
s->has_backing = true;
s->backing = bdrv_query_stats(bs->backing_hd, query_backing);
s->backing = bdrv_query_stats(bs->backing->bs, query_backing);
}
return s;

4
block/qcow.c
View file

@ -597,13 +597,13 @@ static coroutine_fn int qcow_co_readv(BlockDriverState *bs, int64_t sector_num,
}
if (!cluster_offset) {
if (bs->backing_hd) {
if (bs->backing) {
/* read from the base image */
hd_iov.iov_base = (void *)buf;
hd_iov.iov_len = n * 512;
qemu_iovec_init_external(&hd_qiov, &hd_iov, 1);
qemu_co_mutex_unlock(&s->lock);
ret = bdrv_co_readv(bs->backing_hd, sector_num,
ret = bdrv_co_readv(bs->backing->bs, sector_num,
n, &hd_qiov);
qemu_co_mutex_lock(&s->lock);
if (ret < 0) {

4
block/qcow2-cluster.c
View file

@ -1473,7 +1473,7 @@ static int discard_single_l2(BlockDriverState *bs, uint64_t offset,
*/
switch (qcow2_get_cluster_type(old_l2_entry)) {
case QCOW2_CLUSTER_UNALLOCATED:
if (full_discard || !bs->backing_hd) {
if (full_discard || !bs->backing) {
continue;
}
break;
@ -1707,7 +1707,7 @@ static int expand_zero_clusters_in_l1(BlockDriverState *bs, uint64_t *l1_table,
}
if (!preallocated) {
if (!bs->backing_hd) {
if (!bs->backing) {
/* not backed; therefore we can simply deallocate the
* cluster */
l2_table[j] = 0;

6
block/qcow2.c
View file

@ -1369,9 +1369,9 @@ static coroutine_fn int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num,
switch (ret) {
case QCOW2_CLUSTER_UNALLOCATED:
if (bs->backing_hd) {
if (bs->backing) {
/* read from the base image */
n1 = qcow2_backing_read1(bs->backing_hd, &hd_qiov,
n1 = qcow2_backing_read1(bs->backing->bs, &hd_qiov,
sector_num, cur_nr_sectors);
if (n1 > 0) {
QEMUIOVector local_qiov;
@ -1382,7 +1382,7 @@ static coroutine_fn int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num,
BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO);
qemu_co_mutex_unlock(&s->lock);
ret = bdrv_co_readv(bs->backing_hd, sector_num,
ret = bdrv_co_readv(bs->backing->bs, sector_num,
n1, &local_qiov);
qemu_co_mutex_lock(&s->lock);

12
block/qed.c
View file

@ -772,8 +772,8 @@ static void qed_read_backing_file(BDRVQEDState *s, uint64_t pos,
/* If there is a backing file, get its length. Treat the absence of a
* backing file like a zero length backing file.
*/
if (s->bs->backing_hd) {
int64_t l = bdrv_getlength(s->bs->backing_hd);
if (s->bs->backing) {
int64_t l = bdrv_getlength(s->bs->backing->bs);
if (l < 0) {
cb(opaque, l);
return;
@ -802,7 +802,7 @@ static void qed_read_backing_file(BDRVQEDState *s, uint64_t pos,
qemu_iovec_concat(*backing_qiov, qiov, 0, size);
BLKDBG_EVENT(s->bs->file, BLKDBG_READ_BACKING_AIO);
bdrv_aio_readv(s->bs->backing_hd, pos / BDRV_SECTOR_SIZE,
bdrv_aio_readv(s->bs->backing->bs, pos / BDRV_SECTOR_SIZE,
*backing_qiov, size / BDRV_SECTOR_SIZE, cb, opaque);
}
@ -1081,7 +1081,7 @@ static void qed_aio_write_main(void *opaque, int ret)
if (acb->find_cluster_ret == QED_CLUSTER_FOUND) {
next_fn = qed_aio_next_io;
} else {
if (s->bs->backing_hd) {
if (s->bs->backing) {
next_fn = qed_aio_write_flush_before_l2_update;
} else {
next_fn = qed_aio_write_l2_update_cb;
@ -1139,7 +1139,7 @@ static void qed_aio_write_prefill(void *opaque, int ret)
static bool qed_should_set_need_check(BDRVQEDState *s)
{
/* The flush before L2 update path ensures consistency */
if (s->bs->backing_hd) {
if (s->bs->backing) {
return false;
}
@ -1443,7 +1443,7 @@ static int coroutine_fn bdrv_qed_co_write_zeroes(BlockDriverState *bs,
struct iovec iov;
/* Refuse if there are untouched backing file sectors */
if (bs->backing_hd) {
if (bs->backing) {
if (qed_offset_into_cluster(s, sector_num * BDRV_SECTOR_SIZE) != 0) {
return -ENOTSUP;
}

8
block/stream.c
View file

@ -56,7 +56,7 @@ static void close_unused_images(BlockDriverState *top, BlockDriverState *base,
const char *base_id)
{
BlockDriverState *intermediate;
intermediate = top->backing_hd;
intermediate = backing_bs(top);
/* Must assign before bdrv_delete() to prevent traversing dangling pointer
* while we delete backing image instances.
@ -72,7 +72,7 @@ static void close_unused_images(BlockDriverState *top, BlockDriverState *base,
}
unused = intermediate;
intermediate = intermediate->backing_hd;
intermediate = backing_bs(intermediate);
bdrv_set_backing_hd(unused, NULL);
bdrv_unref(unused);
}
@ -121,7 +121,7 @@ static void coroutine_fn stream_run(void *opaque)
int n = 0;
void *buf;
if (!bs->backing_hd) {
if (!bs->backing) {
block_job_completed(&s->common, 0);
return;
}
@ -166,7 +166,7 @@ wait:
} else if (ret >= 0) {
/* Copy if allocated in the intermediate images. Limit to the
* known-unallocated area [sector_num, sector_num+n). */
ret = bdrv_is_allocated_above(bs->backing_hd, base,
ret = bdrv_is_allocated_above(backing_bs(bs), base,
sector_num, n, &n);
/* Finish early if end of backing file has been reached */

21
block/vmdk.c
View file

@ -308,10 +308,11 @@ static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid)
static int vmdk_is_cid_valid(BlockDriverState *bs)
{
BDRVVmdkState *s = bs->opaque;
BlockDriverState *p_bs = bs->backing_hd;
uint32_t cur_pcid;
if (!s->cid_checked && p_bs) {
if (!s->cid_checked && bs->backing) {
BlockDriverState *p_bs = bs->backing->bs;
cur_pcid = vmdk_read_cid(p_bs, 0);
if (s->parent_cid != cur_pcid) {
/* CID not valid */
@ -1006,7 +1007,7 @@ static int get_whole_cluster(BlockDriverState *bs,
cluster_bytes = extent->cluster_sectors << BDRV_SECTOR_BITS;
whole_grain = qemu_blockalign(bs, cluster_bytes);
if (!bs->backing_hd) {
if (!bs->backing) {
memset(whole_grain, 0, skip_start_sector << BDRV_SECTOR_BITS);
memset(whole_grain + (skip_end_sector << BDRV_SECTOR_BITS), 0,
cluster_bytes - (skip_end_sector << BDRV_SECTOR_BITS));
@ -1015,15 +1016,15 @@ static int get_whole_cluster(BlockDriverState *bs,
assert(skip_end_sector <= extent->cluster_sectors);
/* we will be here if it's first write on non-exist grain(cluster).
* try to read from parent image, if exist */
if (bs->backing_hd && !vmdk_is_cid_valid(bs)) {
if (bs->backing && !vmdk_is_cid_valid(bs)) {
ret = VMDK_ERROR;
goto exit;
}
/* Read backing data before skip range */
if (skip_start_sector > 0) {
if (bs->backing_hd) {
ret = bdrv_read(bs->backing_hd, sector_num,
if (bs->backing) {
ret = bdrv_read(bs->backing->bs, sector_num,
whole_grain, skip_start_sector);
if (ret < 0) {
ret = VMDK_ERROR;
@ -1039,8 +1040,8 @@ static int get_whole_cluster(BlockDriverState *bs,
}
/* Read backing data after skip range */
if (skip_end_sector < extent->cluster_sectors) {
if (bs->backing_hd) {
ret = bdrv_read(bs->backing_hd, sector_num + skip_end_sector,
if (bs->backing) {
ret = bdrv_read(bs->backing->bs, sector_num + skip_end_sector,
whole_grain + (skip_end_sector << BDRV_SECTOR_BITS),
extent->cluster_sectors - skip_end_sector);
if (ret < 0) {
@ -1433,11 +1434,11 @@ static int vmdk_read(BlockDriverState *bs, int64_t sector_num,
}
if (ret != VMDK_OK) {
/* if not allocated, try to read from parent image, if exist */
if (bs->backing_hd && ret != VMDK_ZEROED) {
if (bs->backing && ret != VMDK_ZEROED) {
if (!vmdk_is_cid_valid(bs)) {
return -EINVAL;
}
ret = bdrv_read(bs->backing_hd, sector_num, buf, n);
ret = bdrv_read(bs->backing->bs, sector_num, buf, n);
if (ret < 0) {
return ret;
}

6
block/vvfat.c
View file

@ -2972,9 +2972,9 @@ static int enable_write_target(BDRVVVFATState *s, Error **errp)
#endif
bdrv_set_backing_hd(s->bs, bdrv_new());
s->bs->backing_hd->drv = &vvfat_write_target;
s->bs->backing_hd->opaque = g_new(void *, 1);
*(void**)s->bs->backing_hd->opaque = s;
s->bs->backing->bs->drv = &vvfat_write_target;
s->bs->backing->bs->opaque = g_new(void *, 1);
*(void**)s->bs->backing->bs->opaque = s;
return 0;