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block: Factor out bdrv_replace_child_noperm() 

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2017-03-06 13:45:28 +01:00
parent d0ac038025
commit 8ee039951d
1 changed files with 26 additions and 14 deletions
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40
block.c
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@ -1713,11 +1713,10 @@ void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c,
*nshared = shared;
}
static void bdrv_replace_child(BdrvChild *child, BlockDriverState *new_bs,
bool check_new_perm)
static void bdrv_replace_child_noperm(BdrvChild *child,
BlockDriverState *new_bs)
{
BlockDriverState *old_bs = child->bs;
uint64_t perm, shared_perm;
if (old_bs) {
if (old_bs->quiesce_counter && child->role->drained_end) {
@ -1727,13 +1726,6 @@ static void bdrv_replace_child(BdrvChild *child, BlockDriverState *new_bs,
child->role->detach(child);
}
QLIST_REMOVE(child, next_parent);
/* Update permissions for old node. This is guaranteed to succeed
* because we're just taking a parent away, so we're loosening
* restrictions. */
bdrv_get_cumulative_perm(old_bs, &perm, &shared_perm);
bdrv_check_perm(old_bs, perm, shared_perm, &error_abort);
bdrv_set_perm(old_bs, perm, shared_perm);
}
child->bs = new_bs;
@ -1744,15 +1736,35 @@ static void bdrv_replace_child(BdrvChild *child, BlockDriverState *new_bs,
child->role->drained_begin(child);
}
if (child->role->attach) {
child->role->attach(child);
}
}
}
static void bdrv_replace_child(BdrvChild *child, BlockDriverState *new_bs,
bool check_new_perm)
{
BlockDriverState *old_bs = child->bs;
uint64_t perm, shared_perm;
if (old_bs) {
/* Update permissions for old node. This is guaranteed to succeed
* because we're just taking a parent away, so we're loosening
* restrictions. */
bdrv_get_cumulative_perm(old_bs, &perm, &shared_perm);
bdrv_check_perm(old_bs, perm, shared_perm, &error_abort);
bdrv_set_perm(old_bs, perm, shared_perm);
}
bdrv_replace_child_noperm(child, new_bs);
if (new_bs) {
bdrv_get_cumulative_perm(new_bs, &perm, &shared_perm);
if (check_new_perm) {
bdrv_check_perm(new_bs, perm, shared_perm, &error_abort);
}
bdrv_set_perm(new_bs, perm, shared_perm);
if (child->role->attach) {
child->role->attach(child);
}
}
}