motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-07 01:33:56 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

block: introduce bdrv_open_file_child() helper

Browse source 
Almost all drivers call bdrv_open_child() similarly. Let's create a
helper for this.

The only not updated drivers that call bdrv_open_child() to set
bs->file are raw-format and snapshot-access:
    raw-format sometimes want to have filtered child but
        don't set drv->is_filter to true.
    snapshot-access wants only DATA | PRIMARY

Possibly we should implement drv->is_filter_func() handler, to consider
raw-format as filter when it works as filter.. But it's another story.

Note also, that we decrease assignments to bs->file in code: it helps
us restrict modifying this field in further commit.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20220726201134.924743-3-vsementsov@yandex-team.ru>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2022-07-26 23:11:21 +03:00 • committed by Kevin Wolf
parent 046fd84fac
commit 8393078032
24 changed files with 95 additions and 101 deletions
Download patch file Download diff file Expand all files Collapse all files

9
block/copy-before-write.c
View file

@ -412,6 +412,7 @@ static int cbw_open(BlockDriverState *bs, QDict *options, int flags,
int64_t cluster_size;
g_autoptr(BlockdevOptions) full_opts = NULL;
BlockdevOptionsCbw *opts;
int ret;
full_opts = cbw_parse_options(options, errp);
if (!full_opts) {
@ -420,11 +421,9 @@ static int cbw_open(BlockDriverState *bs, QDict *options, int flags,
assert(full_opts->driver == BLOCKDEV_DRIVER_COPY_BEFORE_WRITE);
opts = &full_opts->u.copy_before_write;
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
false, errp);
if (!bs->file) {
return -EINVAL;
ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
if (ret < 0) {
return ret;
}
s->target = bdrv_open_child(NULL, options, "target", bs, &child_of_bds,