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[PULL 34/39] block: refactor bdrv_child_set_perm_safe() transaction acti
From: |
Kevin Wolf |
Subject: |
[PULL 34/39] block: refactor bdrv_child_set_perm_safe() transaction action |
Date: |
Fri, 30 Apr 2021 12:51:42 +0200 |
From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Old interfaces dropped, nobody directly calls
bdrv_child_set_perm_abort() and bdrv_child_set_perm_commit(), so we can
use personal state structure for the action and stop exploiting
BdrvChild structure. Also, drop "_safe" suffix which is redundant now.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20210428151804.439460-35-vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
include/block/block_int.h | 5 ----
block.c | 63 ++++++++++++++-------------------------
2 files changed, 22 insertions(+), 46 deletions(-)
diff --git a/include/block/block_int.h b/include/block/block_int.h
index dd2de6bd1d..c823f5b1b3 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -813,11 +813,6 @@ struct BdrvChild {
*/
uint64_t shared_perm;
- /* backup of permissions during permission update procedure */
- bool has_backup_perm;
- uint64_t backup_perm;
- uint64_t backup_shared_perm;
-
/*
* This link is frozen: the child can neither be replaced nor
* detached from the parent.
diff --git a/block.c b/block.c
index 2362c934a4..7b2a8844f6 100644
--- a/block.c
+++ b/block.c
@@ -2135,59 +2135,40 @@ static GSList *bdrv_topological_dfs(GSList *list,
GHashTable *found,
return g_slist_prepend(list, bs);
}
-static void bdrv_child_set_perm_commit(void *opaque)
-{
- BdrvChild *c = opaque;
-
- c->has_backup_perm = false;
-}
+typedef struct BdrvChildSetPermState {
+ BdrvChild *child;
+ uint64_t old_perm;
+ uint64_t old_shared_perm;
+} BdrvChildSetPermState;
static void bdrv_child_set_perm_abort(void *opaque)
{
- BdrvChild *c = opaque;
- /*
- * We may have child->has_backup_perm unset at this point, as in case of
- * _check_ stage of permission update failure we may _check_ not the whole
- * subtree. Still, _abort_ is called on the whole subtree anyway.
- */
- if (c->has_backup_perm) {
- c->perm = c->backup_perm;
- c->shared_perm = c->backup_shared_perm;
- c->has_backup_perm = false;
- }
+ BdrvChildSetPermState *s = opaque;
+
+ s->child->perm = s->old_perm;
+ s->child->shared_perm = s->old_shared_perm;
}
static TransactionActionDrv bdrv_child_set_pem_drv = {
.abort = bdrv_child_set_perm_abort,
- .commit = bdrv_child_set_perm_commit,
+ .clean = g_free,
};
-/*
- * With tran=NULL needs to be followed by direct call to either
- * bdrv_child_set_perm_commit() or bdrv_child_set_perm_abort().
- *
- * With non-NULL tran needs to be followed by tran_abort() or tran_commit()
- * instead.
- */
-static void bdrv_child_set_perm_safe(BdrvChild *c, uint64_t perm,
- uint64_t shared, Transaction *tran)
+static void bdrv_child_set_perm(BdrvChild *c, uint64_t perm,
+ uint64_t shared, Transaction *tran)
{
- if (!c->has_backup_perm) {
- c->has_backup_perm = true;
- c->backup_perm = c->perm;
- c->backup_shared_perm = c->shared_perm;
- }
- /*
- * Note: it's OK if c->has_backup_perm was already set, as we can find the
- * same c twice during check_perm procedure
- */
+ BdrvChildSetPermState *s = g_new(BdrvChildSetPermState, 1);
+
+ *s = (BdrvChildSetPermState) {
+ .child = c,
+ .old_perm = c->perm,
+ .old_shared_perm = c->shared_perm,
+ };
c->perm = perm;
c->shared_perm = shared;
- if (tran) {
- tran_add(tran, &bdrv_child_set_pem_drv, c);
- }
+ tran_add(tran, &bdrv_child_set_pem_drv, s);
}
static void bdrv_drv_set_perm_commit(void *opaque)
@@ -2367,7 +2348,7 @@ static int bdrv_node_check_perm(BlockDriverState *bs,
BlockReopenQueue *q,
bdrv_child_perm(bs, c->bs, c, c->role, q,
cumulative_perms, cumulative_shared_perms,
&cur_perm, &cur_shared);
- bdrv_child_set_perm_safe(c, cur_perm, cur_shared, tran);
+ bdrv_child_set_perm(c, cur_perm, cur_shared, tran);
}
return 0;
@@ -2466,7 +2447,7 @@ int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm,
uint64_t shared,
Transaction *tran = tran_new();
int ret;
- bdrv_child_set_perm_safe(c, perm, shared, tran);
+ bdrv_child_set_perm(c, perm, shared, tran);
ret = bdrv_refresh_perms(c->bs, &local_err);
--
2.30.2
- [PULL 20/39] block: split out bdrv_replace_node_noperm(), (continued)
- [PULL 20/39] block: split out bdrv_replace_node_noperm(), Kevin Wolf, 2021/04/30
- [PULL 16/39] block: add bdrv_replace_child_safe() transaction action, Kevin Wolf, 2021/04/30
- [PULL 23/39] block: introduce bdrv_drop_filter(), Kevin Wolf, 2021/04/30
- [PULL 22/39] block: add bdrv_remove_filter_or_cow transaction action, Kevin Wolf, 2021/04/30
- [PULL 21/39] block: adapt bdrv_append() for inserting filters, Kevin Wolf, 2021/04/30
- [PULL 24/39] block/backup-top: drop .active, Kevin Wolf, 2021/04/30
- [PULL 25/39] block: drop ignore_children for permission update functions, Kevin Wolf, 2021/04/30
- [PULL 26/39] block: make bdrv_unset_inherits_from to be a transaction action, Kevin Wolf, 2021/04/30
- [PULL 28/39] block: add bdrv_set_backing_noperm() transaction action, Kevin Wolf, 2021/04/30
- [PULL 29/39] block: bdrv_reopen_multiple(): move bdrv_flush to separate pre-prepare, Kevin Wolf, 2021/04/30
- [PULL 34/39] block: refactor bdrv_child_set_perm_safe() transaction action,
Kevin Wolf <=
- [PULL 33/39] block: inline bdrv_replace_child(), Kevin Wolf, 2021/04/30
- [PULL 27/39] block: make bdrv_refresh_limits() to be a transaction action, Kevin Wolf, 2021/04/30
- [PULL 36/39] block: refactor bdrv_node_check_perm(), Kevin Wolf, 2021/04/30
- [PULL 30/39] block: bdrv_reopen_multiple: refresh permissions on updated graph, Kevin Wolf, 2021/04/30
- [PULL 31/39] block: drop unused permission update functions, Kevin Wolf, 2021/04/30
- [PULL 39/39] vhost-user-blk: Fail gracefully on too large queue size, Kevin Wolf, 2021/04/30
- [PULL 32/39] block: inline bdrv_check_perm_common(), Kevin Wolf, 2021/04/30
- [PULL 35/39] block: rename bdrv_replace_child_safe() to bdrv_replace_child(), Kevin Wolf, 2021/04/30
- [PULL 37/39] block: Add BDRV_O_NO_SHARE for blk_new_open(), Kevin Wolf, 2021/04/30