[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[PATCH v4 24/36] block/backup-top: drop .active
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[PATCH v4 24/36] block/backup-top: drop .active |
Date: |
Wed, 28 Apr 2021 18:17:52 +0300 |
We don't need this workaround anymore: bdrv_append is already smart
enough and we can use new bdrv_drop_filter().
This commit efficiently reverts also recent 705dde27c6c53b73, which
checked .active on io path. Still it said that the problem should be
theoretical. And the logic of filter removement is changed anyway.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
---
block/backup-top.c | 47 +-------------------------------------
tests/qemu-iotests/283.out | 2 +-
2 files changed, 2 insertions(+), 47 deletions(-)
diff --git a/block/backup-top.c b/block/backup-top.c
index 62d09f213e..425e3778be 100644
--- a/block/backup-top.c
+++ b/block/backup-top.c
@@ -37,7 +37,6 @@
typedef struct BDRVBackupTopState {
BlockCopyState *bcs;
BdrvChild *target;
- bool active;
int64_t cluster_size;
} BDRVBackupTopState;
@@ -45,12 +44,6 @@ static coroutine_fn int backup_top_co_preadv(
BlockDriverState *bs, uint64_t offset, uint64_t bytes,
QEMUIOVector *qiov, int flags)
{
- BDRVBackupTopState *s = bs->opaque;
-
- if (!s->active) {
- return -EIO;
- }
-
return bdrv_co_preadv(bs->backing, offset, bytes, qiov, flags);
}
@@ -60,10 +53,6 @@ static coroutine_fn int backup_top_cbw(BlockDriverState *bs,
uint64_t offset,
BDRVBackupTopState *s = bs->opaque;
uint64_t off, end;
- if (!s->active) {
- return -EIO;
- }
-
if (flags & BDRV_REQ_WRITE_UNCHANGED) {
return 0;
}
@@ -137,21 +126,6 @@ static void backup_top_child_perm(BlockDriverState *bs,
BdrvChild *c,
uint64_t perm, uint64_t shared,
uint64_t *nperm, uint64_t *nshared)
{
- BDRVBackupTopState *s = bs->opaque;
-
- if (!s->active) {
- /*
- * The filter node may be in process of bdrv_append(), which firstly do
- * bdrv_set_backing_hd() and then bdrv_replace_node(). This means that
- * we can't unshare BLK_PERM_WRITE during bdrv_append() operation. So,
- * let's require nothing during bdrv_append() and refresh permissions
- * after it (see bdrv_backup_top_append()).
- */
- *nperm = 0;
- *nshared = BLK_PERM_ALL;
- return;
- }
-
if (!(role & BDRV_CHILD_FILTERED)) {
/*
* Target child
@@ -241,17 +215,6 @@ BlockDriverState *bdrv_backup_top_append(BlockDriverState
*source,
}
appended = true;
- /*
- * bdrv_append() finished successfully, now we can require permissions
- * we want.
- */
- state->active = true;
- ret = bdrv_child_refresh_perms(top, top->backing, errp);
- if (ret < 0) {
- error_prepend(errp, "Cannot set permissions for backup-top filter: ");
- goto fail;
- }
-
state->cluster_size = cluster_size;
state->bcs = block_copy_state_new(top->backing, state->target,
cluster_size, perf->use_copy_range,
@@ -268,7 +231,6 @@ BlockDriverState *bdrv_backup_top_append(BlockDriverState
*source,
fail:
if (appended) {
- state->active = false;
bdrv_backup_top_drop(top);
} else {
bdrv_unref(top);
@@ -283,16 +245,9 @@ void bdrv_backup_top_drop(BlockDriverState *bs)
{
BDRVBackupTopState *s = bs->opaque;
- bdrv_drained_begin(bs);
+ bdrv_drop_filter(bs, &error_abort);
block_copy_state_free(s->bcs);
- s->active = false;
- bdrv_child_refresh_perms(bs, bs->backing, &error_abort);
- bdrv_replace_node(bs, bs->backing->bs, &error_abort);
- bdrv_set_backing_hd(bs, NULL, &error_abort);
-
- bdrv_drained_end(bs);
-
bdrv_unref(bs);
}
diff --git a/tests/qemu-iotests/283.out b/tests/qemu-iotests/283.out
index 73eb75102f..97e62a4c94 100644
--- a/tests/qemu-iotests/283.out
+++ b/tests/qemu-iotests/283.out
@@ -5,7 +5,7 @@
{"execute": "blockdev-add", "arguments": {"driver": "blkdebug", "image":
"base", "node-name": "other", "take-child-perms": ["write"]}}
{"return": {}}
{"execute": "blockdev-backup", "arguments": {"device": "source", "sync":
"full", "target": "target"}}
-{"error": {"class": "GenericError", "desc": "Cannot set permissions for
backup-top filter: Conflicts with use by source as 'image', which does not
allow 'write' on base"}}
+{"error": {"class": "GenericError", "desc": "Cannot append backup-top filter:
Conflicts with use by source as 'image', which does not allow 'write' on base"}}
=== backup-top should be gone after job-finalize ===
--
2.29.2
- [PATCH v4 18/36] block: add bdrv_attach_child_common() transaction action, (continued)
- [PATCH v4 18/36] block: add bdrv_attach_child_common() transaction action, Vladimir Sementsov-Ogievskiy, 2021/04/28
- [PATCH v4 04/36] block: bdrv_append(): don't consume reference, Vladimir Sementsov-Ogievskiy, 2021/04/28
- [PATCH v4 09/36] block: bdrv_refresh_perms: check for parents permissions conflict, Vladimir Sementsov-Ogievskiy, 2021/04/28
- [PATCH v4 07/36] block: make bdrv_reopen_{prepare, commit, abort} private, Vladimir Sementsov-Ogievskiy, 2021/04/28
- [PATCH v4 10/36] block: refactor bdrv_child* permission functions, Vladimir Sementsov-Ogievskiy, 2021/04/28
- [PATCH v4 11/36] block: rewrite bdrv_child_try_set_perm() using bdrv_refresh_perms(), Vladimir Sementsov-Ogievskiy, 2021/04/28
- [PATCH v4 21/36] block: adapt bdrv_append() for inserting filters, Vladimir Sementsov-Ogievskiy, 2021/04/28
- [PATCH v4 22/36] block: add bdrv_remove_filter_or_cow transaction action, Vladimir Sementsov-Ogievskiy, 2021/04/28
- [PATCH v4 19/36] block: add bdrv_attach_child_noperm() transaction action, Vladimir Sementsov-Ogievskiy, 2021/04/28
- [PATCH v4 31/36] block: drop unused permission update functions, Vladimir Sementsov-Ogievskiy, 2021/04/28
- [PATCH v4 24/36] block/backup-top: drop .active,
Vladimir Sementsov-Ogievskiy <=
- [PATCH v4 20/36] block: split out bdrv_replace_node_noperm(), Vladimir Sementsov-Ogievskiy, 2021/04/28
- [PATCH v4 23/36] block: introduce bdrv_drop_filter(), Vladimir Sementsov-Ogievskiy, 2021/04/28
- [PATCH v4 25/36] block: drop ignore_children for permission update functions, Vladimir Sementsov-Ogievskiy, 2021/04/28
- [PATCH v4 27/36] block: make bdrv_refresh_limits() to be a transaction action, Vladimir Sementsov-Ogievskiy, 2021/04/28
- [PATCH v4 28/36] block: add bdrv_set_backing_noperm() transaction action, Vladimir Sementsov-Ogievskiy, 2021/04/28
- [PATCH v4 26/36] block: make bdrv_unset_inherits_from to be a transaction action, Vladimir Sementsov-Ogievskiy, 2021/04/28
- [PATCH v4 33/36] block: inline bdrv_replace_child(), Vladimir Sementsov-Ogievskiy, 2021/04/28
- [PATCH v4 32/36] block: inline bdrv_check_perm_common(), Vladimir Sementsov-Ogievskiy, 2021/04/28
- [PATCH v4 30/36] block: bdrv_reopen_multiple: refresh permissions on updated graph, Vladimir Sementsov-Ogievskiy, 2021/04/28
- [PATCH v4 34/36] block: refactor bdrv_child_set_perm_safe() transaction action, Vladimir Sementsov-Ogievskiy, 2021/04/28