From: Kevin Wolf <kwolf@redhat.com>
To: qemu-block@nongnu.org
Cc: kwolf@redhat.com, peter.maydell@linaro.org, qemu-devel@nongnu.org
Subject: [PULL 21/39] block: adapt bdrv_append() for inserting filters
Date: Fri, 30 Apr 2021 12:51:29 +0200 [thread overview]
Message-ID: <20210430105147.125840-22-kwolf@redhat.com> (raw)
In-Reply-To: <20210430105147.125840-1-kwolf@redhat.com>
From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
bdrv_append is not very good for inserting filters: it does extra
permission update as part of bdrv_set_backing_hd(). During this update
filter may conflict with other parents of top_bs.
Instead, let's first do all graph modifications and after it update
permissions.
append-greedy-filter test-case in test-bdrv-graph-mod is now works, so
move it out of debug option.
Note: bdrv_append() is still only works for backing-child based
filters. It's something to improve later.
Note2: we use the fact that bdrv_append() is used to append new nodes,
without backing child, so we don't need frozen check and inherits_from
logic from bdrv_set_backing_hd().
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20210428151804.439460-22-vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
block.c | 27 ++++++++++++++++++++-------
tests/unit/test-bdrv-graph-mod.c | 17 ++---------------
2 files changed, 22 insertions(+), 22 deletions(-)
diff --git a/block.c b/block.c
index 9283c8d97b..5bb6a2bef9 100644
--- a/block.c
+++ b/block.c
@@ -5088,25 +5088,38 @@ int bdrv_replace_node(BlockDriverState *from, BlockDriverState *to,
* This will modify the BlockDriverState fields, and swap contents
* between bs_new and bs_top. Both bs_new and bs_top are modified.
*
- * bs_new must not be attached to a BlockBackend.
+ * bs_new must not be attached to a BlockBackend and must not have backing
+ * child.
*
* This function does not create any image files.
*/
int bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top,
Error **errp)
{
- int ret = bdrv_set_backing_hd(bs_new, bs_top, errp);
+ int ret;
+ Transaction *tran = tran_new();
+
+ assert(!bs_new->backing);
+
+ ret = bdrv_attach_child_noperm(bs_new, bs_top, "backing",
+ &child_of_bds, bdrv_backing_role(bs_new),
+ &bs_new->backing, tran, errp);
if (ret < 0) {
- return ret;
+ goto out;
}
- ret = bdrv_replace_node(bs_top, bs_new, errp);
+ ret = bdrv_replace_node_noperm(bs_top, bs_new, true, tran, errp);
if (ret < 0) {
- bdrv_set_backing_hd(bs_new, NULL, &error_abort);
- return ret;
+ goto out;
}
- return 0;
+ ret = bdrv_refresh_perms(bs_new, errp);
+out:
+ tran_finalize(tran, ret);
+
+ bdrv_refresh_limits(bs_top, NULL);
+
+ return ret;
}
static void bdrv_delete(BlockDriverState *bs)
diff --git a/tests/unit/test-bdrv-graph-mod.c b/tests/unit/test-bdrv-graph-mod.c
index 7b3c8b437a..88f25c0cdb 100644
--- a/tests/unit/test-bdrv-graph-mod.c
+++ b/tests/unit/test-bdrv-graph-mod.c
@@ -388,16 +388,6 @@ static void test_append_greedy_filter(void)
int main(int argc, char *argv[])
{
- int i;
- bool debug = false;
-
- for (i = 1; i < argc; i++) {
- if (!strcmp(argv[i], "-d")) {
- debug = true;
- break;
- }
- }
-
bdrv_init();
qemu_init_main_loop(&error_abort);
@@ -410,11 +400,8 @@ int main(int argc, char *argv[])
test_parallel_perm_update);
g_test_add_func("/bdrv-graph-mod/parallel-exclusive-write",
test_parallel_exclusive_write);
-
- if (debug) {
- g_test_add_func("/bdrv-graph-mod/append-greedy-filter",
- test_append_greedy_filter);
- }
+ g_test_add_func("/bdrv-graph-mod/append-greedy-filter",
+ test_append_greedy_filter);
return g_test_run();
}
--
2.30.2
next prev parent reply other threads:[~2021-04-30 11:30 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-30 10:51 [PULL 00/39] Block layer patches Kevin Wolf
2021-04-30 10:51 ` [PULL 01/39] tests/test-bdrv-graph-mod: add test_parallel_exclusive_write Kevin Wolf
2021-04-30 10:51 ` [PULL 02/39] tests/test-bdrv-graph-mod: add test_parallel_perm_update Kevin Wolf
2021-04-30 10:51 ` [PULL 03/39] tests/test-bdrv-graph-mod: add test_append_greedy_filter Kevin Wolf
2021-04-30 10:51 ` [PULL 04/39] block: bdrv_append(): don't consume reference Kevin Wolf
2021-04-30 10:51 ` [PULL 05/39] block: BdrvChildClass: add .get_parent_aio_context handler Kevin Wolf
2021-04-30 10:51 ` [PULL 06/39] block: drop ctx argument from bdrv_root_attach_child Kevin Wolf
2021-04-30 10:51 ` [PULL 07/39] block: make bdrv_reopen_{prepare,commit,abort} private Kevin Wolf
2021-04-30 10:51 ` [PULL 08/39] util: add transactions.c Kevin Wolf
2021-04-30 10:51 ` [PULL 09/39] block: bdrv_refresh_perms: check for parents permissions conflict Kevin Wolf
2021-04-30 10:51 ` [PULL 10/39] block: refactor bdrv_child* permission functions Kevin Wolf
2021-04-30 10:51 ` [PULL 11/39] block: rewrite bdrv_child_try_set_perm() using bdrv_refresh_perms() Kevin Wolf
2021-04-30 10:51 ` [PULL 12/39] block: inline bdrv_child_*() permission functions calls Kevin Wolf
2021-04-30 10:51 ` [PULL 13/39] block: use topological sort for permission update Kevin Wolf
2021-04-30 10:51 ` [PULL 14/39] block: add bdrv_drv_set_perm transaction action Kevin Wolf
2021-04-30 10:51 ` [PULL 15/39] block: add bdrv_list_* permission update functions Kevin Wolf
2021-04-30 10:51 ` [PULL 16/39] block: add bdrv_replace_child_safe() transaction action Kevin Wolf
2021-04-30 10:51 ` [PULL 17/39] block: fix bdrv_replace_node_common Kevin Wolf
2021-04-30 10:51 ` [PULL 18/39] block: add bdrv_attach_child_common() transaction action Kevin Wolf
2021-04-30 22:33 ` Peter Maydell
2021-04-30 10:51 ` [PULL 19/39] block: add bdrv_attach_child_noperm() " Kevin Wolf
2021-04-30 10:51 ` [PULL 20/39] block: split out bdrv_replace_node_noperm() Kevin Wolf
2021-04-30 10:51 ` Kevin Wolf [this message]
2021-04-30 10:51 ` [PULL 22/39] block: add bdrv_remove_filter_or_cow transaction action Kevin Wolf
2021-04-30 10:51 ` [PULL 23/39] block: introduce bdrv_drop_filter() Kevin Wolf
2021-04-30 10:51 ` [PULL 24/39] block/backup-top: drop .active Kevin Wolf
2021-04-30 10:51 ` [PULL 25/39] block: drop ignore_children for permission update functions Kevin Wolf
2021-04-30 10:51 ` [PULL 26/39] block: make bdrv_unset_inherits_from to be a transaction action Kevin Wolf
2021-04-30 10:51 ` [PULL 27/39] block: make bdrv_refresh_limits() " Kevin Wolf
2021-04-30 10:51 ` [PULL 28/39] block: add bdrv_set_backing_noperm() " Kevin Wolf
2021-04-30 10:51 ` [PULL 29/39] block: bdrv_reopen_multiple(): move bdrv_flush to separate pre-prepare Kevin Wolf
2021-04-30 10:51 ` [PULL 30/39] block: bdrv_reopen_multiple: refresh permissions on updated graph Kevin Wolf
2021-04-30 22:38 ` Peter Maydell
2021-04-30 10:51 ` [PULL 31/39] block: drop unused permission update functions Kevin Wolf
2021-04-30 10:51 ` [PULL 32/39] block: inline bdrv_check_perm_common() Kevin Wolf
2021-04-30 10:51 ` [PULL 33/39] block: inline bdrv_replace_child() Kevin Wolf
2021-04-30 10:51 ` [PULL 34/39] block: refactor bdrv_child_set_perm_safe() transaction action Kevin Wolf
2021-04-30 10:51 ` [PULL 35/39] block: rename bdrv_replace_child_safe() to bdrv_replace_child() Kevin Wolf
2021-04-30 10:51 ` [PULL 36/39] block: refactor bdrv_node_check_perm() Kevin Wolf
2021-04-30 10:51 ` [PULL 37/39] block: Add BDRV_O_NO_SHARE for blk_new_open() Kevin Wolf
2021-04-30 10:51 ` [PULL 38/39] qemu-img convert: Unshare write permission for source Kevin Wolf
2021-04-30 10:51 ` [PULL 39/39] vhost-user-blk: Fail gracefully on too large queue size Kevin Wolf
2021-04-30 15:00 ` [PULL 00/39] Block layer patches Peter Maydell
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