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block: drop unused permission update functions

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Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20210428151804.439460-32-vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2021-04-28 18:17:59 +03:00 committed by Kevin Wolf
parent 72373e40fb
commit 058acc4708
1 changed files with 0 additions and 103 deletions
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103
block.c
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@ -1987,11 +1987,6 @@ static int bdrv_fill_options(QDict **options, const char *filename,
return 0;
}
static int bdrv_check_update_perm(BlockDriverState *bs, BlockReopenQueue *q,
uint64_t new_used_perm,
uint64_t new_shared_perm,
Error **errp);
typedef struct BlockReopenQueueEntry {
bool prepared;
bool perms_checked;
@ -2426,56 +2421,12 @@ static int bdrv_check_perm_common(GSList *list, BlockReopenQueue *q,
return 0;
}
static int bdrv_check_perm(BlockDriverState *bs, BlockReopenQueue *q,
uint64_t cumulative_perms,
uint64_t cumulative_shared_perms, Error **errp)
{
g_autoptr(GSList) list = bdrv_topological_dfs(NULL, NULL, bs);
return bdrv_check_perm_common(list, q, true, cumulative_perms,
cumulative_shared_perms, NULL, errp);
}
static int bdrv_list_refresh_perms(GSList *list, BlockReopenQueue *q,
Transaction *tran, Error **errp)
{
return bdrv_check_perm_common(list, q, false, 0, 0, tran, errp);
}
/*
* Notifies drivers that after a previous bdrv_check_perm() call, the
* permission update is not performed and any preparations made for it (e.g.
* taken file locks) need to be undone.
*/
static void bdrv_node_abort_perm_update(BlockDriverState *bs)
{
BlockDriver *drv = bs->drv;
BdrvChild *c;
if (!drv) {
return;
}
bdrv_drv_set_perm_abort(bs);
QLIST_FOREACH(c, &bs->children, next) {
bdrv_child_set_perm_abort(c);
}
}
static void bdrv_list_abort_perm_update(GSList *list)
{
for ( ; list; list = list->next) {
bdrv_node_abort_perm_update((BlockDriverState *)list->data);
}
}
__attribute__((unused))
static void bdrv_abort_perm_update(BlockDriverState *bs)
{
g_autoptr(GSList) list = bdrv_topological_dfs(NULL, NULL, bs);
return bdrv_list_abort_perm_update(list);
}
static void bdrv_node_set_perm(BlockDriverState *bs)
{
BlockDriver *drv = bs->drv;
@ -2557,60 +2508,6 @@ char *bdrv_perm_names(uint64_t perm)
return g_string_free(result, FALSE);
}
/*
* Checks whether a new reference to @bs can be added if the new user requires
* @new_used_perm/@new_shared_perm as its permissions. If @ignore_children is
* set, the BdrvChild objects in this list are ignored in the calculations;
* this allows checking permission updates for an existing reference.
*
* Needs to be followed by a call to either bdrv_set_perm() or
* bdrv_abort_perm_update(). */
__attribute__((unused))
static int bdrv_check_update_perm(BlockDriverState *bs, BlockReopenQueue *q,
uint64_t new_used_perm,
uint64_t new_shared_perm,
Error **errp)
{
BdrvChild *c;
uint64_t cumulative_perms = new_used_perm;
uint64_t cumulative_shared_perms = new_shared_perm;
/* There is no reason why anyone couldn't tolerate write_unchanged */
assert(new_shared_perm & BLK_PERM_WRITE_UNCHANGED);
QLIST_FOREACH(c, &bs->parents, next_parent) {
if ((new_used_perm & c->shared_perm) != new_used_perm) {
char *user = bdrv_child_user_desc(c);
char *perm_names = bdrv_perm_names(new_used_perm & ~c->shared_perm);
error_setg(errp, "Conflicts with use by %s as '%s', which does not "
"allow '%s' on %s",
user, c->name, perm_names, bdrv_get_node_name(c->bs));
g_free(user);
g_free(perm_names);
return -EPERM;
}
if ((c->perm & new_shared_perm) != c->perm) {
char *user = bdrv_child_user_desc(c);
char *perm_names = bdrv_perm_names(c->perm & ~new_shared_perm);
error_setg(errp, "Conflicts with use by %s as '%s', which uses "
"'%s' on %s",
user, c->name, perm_names, bdrv_get_node_name(c->bs));
g_free(user);
g_free(perm_names);
return -EPERM;
}
cumulative_perms |= c->perm;
cumulative_shared_perms &= c->shared_perm;
}
return bdrv_check_perm(bs, q, cumulative_perms, cumulative_shared_perms,
errp);
}
static int bdrv_refresh_perms(BlockDriverState *bs, Error **errp)
{