* [PATCH v4 01/35] block: rename bdrv_replace_child to bdrv_replace_child_tran
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 02/35] block: comment graph-modifying function not updating permissions Vladimir Sementsov-Ogievskiy
` (33 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
We have bdrv_replace_child() wrapper on bdrv_replace_child_noperm().
But bdrv_replace_child() doesn't update permissions. It's rather
strange, as normally it's expected that foo() should call foo_noperm()
and update permissions.
Let's rename and add comment.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
block.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/block.c b/block.c
index 3f456892d0..34bfe4ffe8 100644
--- a/block.c
+++ b/block.c
@@ -2249,12 +2249,14 @@ static TransactionActionDrv bdrv_replace_child_drv = {
};
/*
- * bdrv_replace_child
+ * bdrv_replace_child_tran
*
* Note: real unref of old_bs is done only on commit.
+ *
+ * The function doesn't update permissions, caller is responsible for this.
*/
-static void bdrv_replace_child(BdrvChild *child, BlockDriverState *new_bs,
- Transaction *tran)
+static void bdrv_replace_child_tran(BdrvChild *child, BlockDriverState *new_bs,
+ Transaction *tran)
{
BdrvReplaceChildState *s = g_new(BdrvReplaceChildState, 1);
*s = (BdrvReplaceChildState) {
@@ -4766,7 +4768,7 @@ static void bdrv_remove_filter_or_cow_child_abort(void *opaque)
}
/*
- * We don't have to restore child->bs here to undo bdrv_replace_child()
+ * We don't have to restore child->bs here to undo bdrv_replace_child_tran()
* because that function is transactionable and it registered own completion
* entries in @tran, so .abort() for bdrv_replace_child_safe() will be
* called automatically.
@@ -4802,7 +4804,7 @@ static void bdrv_remove_filter_or_cow_child(BlockDriverState *bs,
}
if (child->bs) {
- bdrv_replace_child(child, NULL, tran);
+ bdrv_replace_child_tran(child, NULL, tran);
}
s = g_new(BdrvRemoveFilterOrCowChild, 1);
@@ -4842,7 +4844,7 @@ static int bdrv_replace_node_noperm(BlockDriverState *from,
c->name, from->node_name);
return -EPERM;
}
- bdrv_replace_child(c, to, tran);
+ bdrv_replace_child_tran(c, to, tran);
}
return 0;
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 02/35] block: comment graph-modifying function not updating permissions
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 01/35] block: rename bdrv_replace_child to bdrv_replace_child_tran Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 03/35] block: introduce bdrv_replace_child_bs() Vladimir Sementsov-Ogievskiy
` (32 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
block.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/block.c b/block.c
index 34bfe4ffe8..98673e788a 100644
--- a/block.c
+++ b/block.c
@@ -2770,6 +2770,8 @@ static TransactionActionDrv bdrv_attach_child_common_drv = {
* @child is saved to a new entry of @tran, so that *@child could be reverted to
* NULL on abort(). So referenced variable must live at least until transaction
* end.
+ *
+ * Function doesn't update permissions, caller is responsible for this.
*/
static int bdrv_attach_child_common(BlockDriverState *child_bs,
const char *child_name,
@@ -2848,6 +2850,8 @@ static int bdrv_attach_child_common(BlockDriverState *child_bs,
/*
* Variable referenced by @child must live at least until transaction end.
* (see bdrv_attach_child_common() doc for details)
+ *
+ * Function doesn't update permissions, caller is responsible for this.
*/
static int bdrv_attach_child_noperm(BlockDriverState *parent_bs,
BlockDriverState *child_bs,
@@ -3115,6 +3119,8 @@ static BdrvChildRole bdrv_backing_role(BlockDriverState *bs)
/*
* Sets the bs->backing link of a BDS. A new reference is created; callers
* which don't need their own reference any more must call bdrv_unref().
+ *
+ * Function doesn't update permissions, caller is responsible for this.
*/
static int bdrv_set_backing_noperm(BlockDriverState *bs,
BlockDriverState *backing_hd,
@@ -4792,6 +4798,8 @@ static TransactionActionDrv bdrv_remove_filter_or_cow_child_drv = {
* A function to remove backing-chain child of @bs if exists: cow child for
* format nodes (always .backing) and filter child for filters (may be .file or
* .backing)
+ *
+ * Function doesn't update permissions, caller is responsible for this.
*/
static void bdrv_remove_filter_or_cow_child(BlockDriverState *bs,
Transaction *tran)
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 03/35] block: introduce bdrv_replace_child_bs()
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 01/35] block: rename bdrv_replace_child to bdrv_replace_child_tran Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 02/35] block: comment graph-modifying function not updating permissions Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 04/35] block: introduce blk_replace_bs Vladimir Sementsov-Ogievskiy
` (31 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
Add function to transactionally replace bs inside BdrvChild.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
include/block/block.h | 2 ++
block.c | 31 +++++++++++++++++++++++++++++++
2 files changed, 33 insertions(+)
diff --git a/include/block/block.h b/include/block/block.h
index 8e707a83b7..3a16ca341d 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -361,6 +361,8 @@ int bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top,
Error **errp);
int bdrv_replace_node(BlockDriverState *from, BlockDriverState *to,
Error **errp);
+int bdrv_replace_child_bs(BdrvChild *child, BlockDriverState *new_bs,
+ Error **errp);
BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *node_options,
int flags, Error **errp);
int bdrv_drop_filter(BlockDriverState *bs, Error **errp);
diff --git a/block.c b/block.c
index 98673e788a..b6658381e3 100644
--- a/block.c
+++ b/block.c
@@ -4987,6 +4987,37 @@ out:
return ret;
}
+/* Not for empty child */
+int bdrv_replace_child_bs(BdrvChild *child, BlockDriverState *new_bs,
+ Error **errp)
+{
+ int ret;
+ Transaction *tran = tran_new();
+ g_autoptr(GHashTable) found = NULL;
+ g_autoptr(GSList) refresh_list = NULL;
+ BlockDriverState *old_bs = child->bs;
+
+ bdrv_ref(old_bs);
+ bdrv_drained_begin(old_bs);
+ bdrv_drained_begin(new_bs);
+
+ bdrv_replace_child_tran(child, new_bs, tran);
+
+ found = g_hash_table_new(NULL, NULL);
+ refresh_list = bdrv_topological_dfs(refresh_list, found, old_bs);
+ refresh_list = bdrv_topological_dfs(refresh_list, found, new_bs);
+
+ ret = bdrv_list_refresh_perms(refresh_list, NULL, tran, errp);
+
+ tran_finalize(tran, ret);
+
+ bdrv_drained_end(old_bs);
+ bdrv_drained_end(new_bs);
+ bdrv_unref(old_bs);
+
+ return ret;
+}
+
static void bdrv_delete(BlockDriverState *bs)
{
assert(bdrv_op_blocker_is_empty(bs));
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 04/35] block: introduce blk_replace_bs
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (2 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 03/35] block: introduce bdrv_replace_child_bs() Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 05/35] qdev-properties: PropertyInfo: add realized_set_allowed field Vladimir Sementsov-Ogievskiy
` (30 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
Add function to change bs inside blk.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
include/sysemu/block-backend.h | 1 +
block/block-backend.c | 8 ++++++++
2 files changed, 9 insertions(+)
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 5423e3d9c6..05b0ceb746 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -102,6 +102,7 @@ BlockBackend *blk_by_public(BlockBackendPublic *public);
BlockDriverState *blk_bs(BlockBackend *blk);
void blk_remove_bs(BlockBackend *blk);
int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp);
+int blk_replace_bs(BlockBackend *blk, BlockDriverState *new_bs, Error **errp);
bool bdrv_has_blk(BlockDriverState *bs);
bool bdrv_is_root_node(BlockDriverState *bs);
int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm,
diff --git a/block/block-backend.c b/block/block-backend.c
index 15f1ea4288..8fabc1c835 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -869,6 +869,14 @@ int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp)
return 0;
}
+/*
+ * Change BlockDriverState associated with @blk.
+ */
+int blk_replace_bs(BlockBackend *blk, BlockDriverState *new_bs, Error **errp)
+{
+ return bdrv_replace_child_bs(blk->root, new_bs, errp);
+}
+
/*
* Sets the permission bitmasks that the user of the BlockBackend needs.
*/
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 05/35] qdev-properties: PropertyInfo: add realized_set_allowed field
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (3 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 04/35] block: introduce blk_replace_bs Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 06/35] qdev: allow setting drive property for realized device Vladimir Sementsov-Ogievskiy
` (29 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
Add field, so property can declare support for setting the property
when device is realized. To be used in the following commit.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
include/hw/qdev-properties.h | 1 +
hw/core/qdev-properties.c | 6 +++---
2 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/include/hw/qdev-properties.h b/include/hw/qdev-properties.h
index 0ef97d60ce..f7925f67d0 100644
--- a/include/hw/qdev-properties.h
+++ b/include/hw/qdev-properties.h
@@ -32,6 +32,7 @@ struct PropertyInfo {
const char *name;
const char *description;
const QEnumLookup *enum_table;
+ bool realized_set_allowed; /* allow setting property on realized device */
int (*print)(Object *obj, Property *prop, char *dest, size_t len);
void (*set_default_value)(ObjectProperty *op, const Property *prop);
ObjectProperty *(*create)(ObjectClass *oc, const char *name,
diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c
index 50f40949f5..c34aac6ebc 100644
--- a/hw/core/qdev-properties.c
+++ b/hw/core/qdev-properties.c
@@ -26,11 +26,11 @@ void qdev_prop_set_after_realize(DeviceState *dev, const char *name,
/* returns: true if property is allowed to be set, false otherwise */
static bool qdev_prop_allow_set(Object *obj, const char *name,
- Error **errp)
+ const PropertyInfo *info, Error **errp)
{
DeviceState *dev = DEVICE(obj);
- if (dev->realized) {
+ if (dev->realized && !info->realized_set_allowed) {
qdev_prop_set_after_realize(dev, name, errp);
return false;
}
@@ -79,7 +79,7 @@ static void field_prop_set(Object *obj, Visitor *v, const char *name,
{
Property *prop = opaque;
- if (!qdev_prop_allow_set(obj, name, errp)) {
+ if (!qdev_prop_allow_set(obj, name, prop->info, errp)) {
return;
}
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 06/35] qdev: allow setting drive property for realized device
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (4 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 05/35] qdev-properties: PropertyInfo: add realized_set_allowed field Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 07/35] block: rename backup-top to copy-before-write Vladimir Sementsov-Ogievskiy
` (28 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
We need an ability to insert filters above top block node, attached to
block device. It can't be achieved with blockdev-reopen command. So, we
want do it with help of qom-set.
Intended usage:
Assume there is a node A that is attached to some guest device.
1. blockdev-add to create a filter node B that has A as its child.
2. qom-set to change the node attached to the guest device’s
BlockBackend from A to B.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
hw/core/qdev-properties-system.c | 43 +++++++++++++++++++++++---------
1 file changed, 31 insertions(+), 12 deletions(-)
diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c
index 2760c21f11..e71f5d64d1 100644
--- a/hw/core/qdev-properties-system.c
+++ b/hw/core/qdev-properties-system.c
@@ -36,11 +36,11 @@
static bool check_prop_still_unset(Object *obj, const char *name,
const void *old_val, const char *new_val,
- Error **errp)
+ bool allow_override, Error **errp)
{
const GlobalProperty *prop = qdev_find_global_prop(obj, name);
- if (!old_val) {
+ if (!old_val || (!prop && allow_override)) {
return true;
}
@@ -93,16 +93,34 @@ static void set_drive_helper(Object *obj, Visitor *v, const char *name,
BlockBackend *blk;
bool blk_created = false;
int ret;
+ BlockDriverState *bs;
+ AioContext *ctx;
if (!visit_type_str(v, name, &str, errp)) {
return;
}
- /*
- * TODO Should this really be an error? If no, the old value
- * needs to be released before we store the new one.
- */
- if (!check_prop_still_unset(obj, name, *ptr, str, errp)) {
+ if (!check_prop_still_unset(obj, name, *ptr, str, true, errp)) {
+ return;
+ }
+
+ if (*ptr) {
+ /* BlockBackend alread exists. So, we want to change attached node */
+ blk = *ptr;
+ ctx = blk_get_aio_context(blk);
+ bs = bdrv_lookup_bs(NULL, str, errp);
+ if (!bs) {
+ return;
+ }
+
+ if (ctx != bdrv_get_aio_context(bs)) {
+ error_setg(errp, "Different aio context is not supported for new "
+ "node");
+ }
+
+ aio_context_acquire(ctx);
+ blk_replace_bs(blk, bs, errp);
+ aio_context_release(ctx);
return;
}
@@ -114,7 +132,7 @@ static void set_drive_helper(Object *obj, Visitor *v, const char *name,
blk = blk_by_name(str);
if (!blk) {
- BlockDriverState *bs = bdrv_lookup_bs(NULL, str, NULL);
+ bs = bdrv_lookup_bs(NULL, str, NULL);
if (bs) {
/*
* If the device supports iothreads, it will make sure to move the
@@ -123,8 +141,7 @@ static void set_drive_helper(Object *obj, Visitor *v, const char *name,
* aware of iothreads require their BlockBackends to be in the main
* AioContext.
*/
- AioContext *ctx = iothread ? bdrv_get_aio_context(bs) :
- qemu_get_aio_context();
+ ctx = iothread ? bdrv_get_aio_context(bs) : qemu_get_aio_context();
blk = blk_new(ctx, 0, BLK_PERM_ALL);
blk_created = true;
@@ -196,6 +213,7 @@ static void release_drive(Object *obj, const char *name, void *opaque)
const PropertyInfo qdev_prop_drive = {
.name = "str",
.description = "Node name or ID of a block device to use as a backend",
+ .realized_set_allowed = true,
.get = get_drive,
.set = set_drive,
.release = release_drive,
@@ -204,6 +222,7 @@ const PropertyInfo qdev_prop_drive = {
const PropertyInfo qdev_prop_drive_iothread = {
.name = "str",
.description = "Node name or ID of a block device to use as a backend",
+ .realized_set_allowed = true,
.get = get_drive,
.set = set_drive_iothread,
.release = release_drive,
@@ -238,7 +257,7 @@ static void set_chr(Object *obj, Visitor *v, const char *name, void *opaque,
* TODO Should this really be an error? If no, the old value
* needs to be released before we store the new one.
*/
- if (!check_prop_still_unset(obj, name, be->chr, str, errp)) {
+ if (!check_prop_still_unset(obj, name, be->chr, str, false, errp)) {
return;
}
@@ -408,7 +427,7 @@ static void set_netdev(Object *obj, Visitor *v, const char *name,
* TODO Should this really be an error? If no, the old value
* needs to be released before we store the new one.
*/
- if (!check_prop_still_unset(obj, name, ncs[i], str, errp)) {
+ if (!check_prop_still_unset(obj, name, ncs[i], str, false, errp)) {
goto out;
}
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 07/35] block: rename backup-top to copy-before-write
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (5 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 06/35] qdev: allow setting drive property for realized device Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 08/35] block-copy: always set BDRV_REQ_SERIALISING flag Vladimir Sementsov-Ogievskiy
` (27 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
We are going to convert backup_top to full featured public filter,
which can be used in separate of backup job. Start from renaming from
"how it used" to "what it does".
While updating comments in 283 iotest, drop and rephrase also things
about ".active", as this field is now dropped, and filter doesn't have
"inactive" mode.
Note that this change may be considered as incompatible interface
change, as backup-top filter format name was visible through
query-block and query-named-block-nodes.
Still, consider the following reasoning:
1. backup-top was never documented, so if someone depends on format
name (for driver that can't be used other than it is automatically
inserted on backup job start), it's a kind of "undocumented feature
use". So I think we are free to change it.
2. There is a hope, that there is no such users: it's a lot more native
to give a good node-name to backup-top filter if need to operate
with it somehow, and don't touch format name.
3. Another "incompatible" change in further commit would be moving
copy-before-write filter from using backing child to file child. And
this is even more reasonable than renaming: for now all public
filters are file-child based.
So, it's a risky change, but risk seems small and good interface worth
it.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
block/{backup-top.h => copy-before-write.h} | 28 +++---
block/backup.c | 22 ++---
block/{backup-top.c => copy-before-write.c} | 100 ++++++++++----------
MAINTAINERS | 4 +-
block/meson.build | 2 +-
tests/qemu-iotests/283 | 35 +++----
tests/qemu-iotests/283.out | 4 +-
7 files changed, 95 insertions(+), 100 deletions(-)
rename block/{backup-top.h => copy-before-write.h} (56%)
rename block/{backup-top.c => copy-before-write.c} (62%)
diff --git a/block/backup-top.h b/block/copy-before-write.h
similarity index 56%
rename from block/backup-top.h
rename to block/copy-before-write.h
index b28b0031c4..5977b7aa31 100644
--- a/block/backup-top.h
+++ b/block/copy-before-write.h
@@ -1,10 +1,10 @@
/*
- * backup-top filter driver
+ * copy-before-write filter driver
*
* The driver performs Copy-Before-Write (CBW) operation: it is injected above
* some node, and before each write it copies _old_ data to the target node.
*
- * Copyright (c) 2018-2019 Virtuozzo International GmbH.
+ * Copyright (c) 2018-2021 Virtuozzo International GmbH.
*
* Author:
* Sementsov-Ogievskiy Vladimir <vsementsov@virtuozzo.com>
@@ -23,20 +23,20 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-#ifndef BACKUP_TOP_H
-#define BACKUP_TOP_H
+#ifndef COPY_BEFORE_WRITE_H
+#define COPY_BEFORE_WRITE_H
#include "block/block_int.h"
#include "block/block-copy.h"
-BlockDriverState *bdrv_backup_top_append(BlockDriverState *source,
- BlockDriverState *target,
- const char *filter_node_name,
- uint64_t cluster_size,
- BackupPerf *perf,
- BdrvRequestFlags write_flags,
- BlockCopyState **bcs,
- Error **errp);
-void bdrv_backup_top_drop(BlockDriverState *bs);
+BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
+ BlockDriverState *target,
+ const char *filter_node_name,
+ uint64_t cluster_size,
+ BackupPerf *perf,
+ BdrvRequestFlags write_flags,
+ BlockCopyState **bcs,
+ Error **errp);
+void bdrv_cbw_drop(BlockDriverState *bs);
-#endif /* BACKUP_TOP_H */
+#endif /* COPY_BEFORE_WRITE_H */
diff --git a/block/backup.c b/block/backup.c
index bd3614ce70..ac91821b08 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -27,13 +27,13 @@
#include "qemu/bitmap.h"
#include "qemu/error-report.h"
-#include "block/backup-top.h"
+#include "block/copy-before-write.h"
#define BACKUP_CLUSTER_SIZE_DEFAULT (1 << 16)
typedef struct BackupBlockJob {
BlockJob common;
- BlockDriverState *backup_top;
+ BlockDriverState *cbw;
BlockDriverState *source_bs;
BlockDriverState *target_bs;
@@ -104,7 +104,7 @@ static void backup_clean(Job *job)
{
BackupBlockJob *s = container_of(job, BackupBlockJob, common.job);
block_job_remove_all_bdrv(&s->common);
- bdrv_backup_top_drop(s->backup_top);
+ bdrv_cbw_drop(s->cbw);
}
void backup_do_checkpoint(BlockJob *job, Error **errp)
@@ -408,7 +408,7 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
BackupBlockJob *job = NULL;
int64_t cluster_size;
BdrvRequestFlags write_flags;
- BlockDriverState *backup_top = NULL;
+ BlockDriverState *cbw = NULL;
BlockCopyState *bcs = NULL;
assert(bs);
@@ -521,22 +521,22 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
write_flags = (bdrv_chain_contains(target, bs) ? BDRV_REQ_SERIALISING : 0) |
(compress ? BDRV_REQ_WRITE_COMPRESSED : 0),
- backup_top = bdrv_backup_top_append(bs, target, filter_node_name,
+ cbw = bdrv_cbw_append(bs, target, filter_node_name,
cluster_size, perf,
write_flags, &bcs, errp);
- if (!backup_top) {
+ if (!cbw) {
goto error;
}
/* job->len is fixed, so we can't allow resize */
- job = block_job_create(job_id, &backup_job_driver, txn, backup_top,
+ job = block_job_create(job_id, &backup_job_driver, txn, cbw,
0, BLK_PERM_ALL,
speed, creation_flags, cb, opaque, errp);
if (!job) {
goto error;
}
- job->backup_top = backup_top;
+ job->cbw = cbw;
job->source_bs = bs;
job->target_bs = target;
job->on_source_error = on_source_error;
@@ -552,7 +552,7 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
block_copy_set_progress_meter(bcs, &job->common.job.progress);
block_copy_set_speed(bcs, speed);
- /* Required permissions are already taken by backup-top target */
+ /* Required permissions are taken by copy-before-write filter target */
block_job_add_bdrv(&job->common, "target", target, 0, BLK_PERM_ALL,
&error_abort);
@@ -562,8 +562,8 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
if (sync_bitmap) {
bdrv_reclaim_dirty_bitmap(sync_bitmap, NULL);
}
- if (backup_top) {
- bdrv_backup_top_drop(backup_top);
+ if (cbw) {
+ bdrv_cbw_drop(cbw);
}
return NULL;
diff --git a/block/backup-top.c b/block/copy-before-write.c
similarity index 62%
rename from block/backup-top.c
rename to block/copy-before-write.c
index 425e3778be..0dc5a107cf 100644
--- a/block/backup-top.c
+++ b/block/copy-before-write.c
@@ -1,10 +1,10 @@
/*
- * backup-top filter driver
+ * copy-before-write filter driver
*
* The driver performs Copy-Before-Write (CBW) operation: it is injected above
* some node, and before each write it copies _old_ data to the target node.
*
- * Copyright (c) 2018-2019 Virtuozzo International GmbH.
+ * Copyright (c) 2018-2021 Virtuozzo International GmbH.
*
* Author:
* Sementsov-Ogievskiy Vladimir <vsementsov@virtuozzo.com>
@@ -32,25 +32,25 @@
#include "block/qdict.h"
#include "block/block-copy.h"
-#include "block/backup-top.h"
+#include "block/copy-before-write.h"
-typedef struct BDRVBackupTopState {
+typedef struct BDRVCopyBeforeWriteState {
BlockCopyState *bcs;
BdrvChild *target;
int64_t cluster_size;
-} BDRVBackupTopState;
+} BDRVCopyBeforeWriteState;
-static coroutine_fn int backup_top_co_preadv(
+static coroutine_fn int cbw_co_preadv(
BlockDriverState *bs, uint64_t offset, uint64_t bytes,
QEMUIOVector *qiov, int flags)
{
return bdrv_co_preadv(bs->backing, offset, bytes, qiov, flags);
}
-static coroutine_fn int backup_top_cbw(BlockDriverState *bs, uint64_t offset,
- uint64_t bytes, BdrvRequestFlags flags)
+static coroutine_fn int cbw_do_copy_before_write(BlockDriverState *bs,
+ uint64_t offset, uint64_t bytes, BdrvRequestFlags flags)
{
- BDRVBackupTopState *s = bs->opaque;
+ BDRVCopyBeforeWriteState *s = bs->opaque;
uint64_t off, end;
if (flags & BDRV_REQ_WRITE_UNCHANGED) {
@@ -63,10 +63,10 @@ static coroutine_fn int backup_top_cbw(BlockDriverState *bs, uint64_t offset,
return block_copy(s->bcs, off, end - off, true);
}
-static int coroutine_fn backup_top_co_pdiscard(BlockDriverState *bs,
- int64_t offset, int bytes)
+static int coroutine_fn cbw_co_pdiscard(BlockDriverState *bs,
+ int64_t offset, int bytes)
{
- int ret = backup_top_cbw(bs, offset, bytes, 0);
+ int ret = cbw_do_copy_before_write(bs, offset, bytes, 0);
if (ret < 0) {
return ret;
}
@@ -74,10 +74,10 @@ static int coroutine_fn backup_top_co_pdiscard(BlockDriverState *bs,
return bdrv_co_pdiscard(bs->backing, offset, bytes);
}
-static int coroutine_fn backup_top_co_pwrite_zeroes(BlockDriverState *bs,
+static int coroutine_fn cbw_co_pwrite_zeroes(BlockDriverState *bs,
int64_t offset, int bytes, BdrvRequestFlags flags)
{
- int ret = backup_top_cbw(bs, offset, bytes, flags);
+ int ret = cbw_do_copy_before_write(bs, offset, bytes, flags);
if (ret < 0) {
return ret;
}
@@ -85,12 +85,12 @@ static int coroutine_fn backup_top_co_pwrite_zeroes(BlockDriverState *bs,
return bdrv_co_pwrite_zeroes(bs->backing, offset, bytes, flags);
}
-static coroutine_fn int backup_top_co_pwritev(BlockDriverState *bs,
- uint64_t offset,
- uint64_t bytes,
- QEMUIOVector *qiov, int flags)
+static coroutine_fn int cbw_co_pwritev(BlockDriverState *bs,
+ uint64_t offset,
+ uint64_t bytes,
+ QEMUIOVector *qiov, int flags)
{
- int ret = backup_top_cbw(bs, offset, bytes, flags);
+ int ret = cbw_do_copy_before_write(bs, offset, bytes, flags);
if (ret < 0) {
return ret;
}
@@ -98,7 +98,7 @@ static coroutine_fn int backup_top_co_pwritev(BlockDriverState *bs,
return bdrv_co_pwritev(bs->backing, offset, bytes, qiov, flags);
}
-static int coroutine_fn backup_top_co_flush(BlockDriverState *bs)
+static int coroutine_fn cbw_co_flush(BlockDriverState *bs)
{
if (!bs->backing) {
return 0;
@@ -107,7 +107,7 @@ static int coroutine_fn backup_top_co_flush(BlockDriverState *bs)
return bdrv_co_flush(bs->backing->bs);
}
-static void backup_top_refresh_filename(BlockDriverState *bs)
+static void cbw_refresh_filename(BlockDriverState *bs)
{
if (bs->backing == NULL) {
/*
@@ -120,11 +120,11 @@ static void backup_top_refresh_filename(BlockDriverState *bs)
bs->backing->bs->filename);
}
-static void backup_top_child_perm(BlockDriverState *bs, BdrvChild *c,
- BdrvChildRole role,
- BlockReopenQueue *reopen_queue,
- uint64_t perm, uint64_t shared,
- uint64_t *nperm, uint64_t *nshared)
+static void cbw_child_perm(BlockDriverState *bs, BdrvChild *c,
+ BdrvChildRole role,
+ BlockReopenQueue *reopen_queue,
+ uint64_t perm, uint64_t shared,
+ uint64_t *nperm, uint64_t *nshared)
{
if (!(role & BDRV_CHILD_FILTERED)) {
/*
@@ -149,41 +149,41 @@ static void backup_top_child_perm(BlockDriverState *bs, BdrvChild *c,
}
}
-BlockDriver bdrv_backup_top_filter = {
- .format_name = "backup-top",
- .instance_size = sizeof(BDRVBackupTopState),
+BlockDriver bdrv_cbw_filter = {
+ .format_name = "copy-before-write",
+ .instance_size = sizeof(BDRVCopyBeforeWriteState),
- .bdrv_co_preadv = backup_top_co_preadv,
- .bdrv_co_pwritev = backup_top_co_pwritev,
- .bdrv_co_pwrite_zeroes = backup_top_co_pwrite_zeroes,
- .bdrv_co_pdiscard = backup_top_co_pdiscard,
- .bdrv_co_flush = backup_top_co_flush,
+ .bdrv_co_preadv = cbw_co_preadv,
+ .bdrv_co_pwritev = cbw_co_pwritev,
+ .bdrv_co_pwrite_zeroes = cbw_co_pwrite_zeroes,
+ .bdrv_co_pdiscard = cbw_co_pdiscard,
+ .bdrv_co_flush = cbw_co_flush,
- .bdrv_refresh_filename = backup_top_refresh_filename,
+ .bdrv_refresh_filename = cbw_refresh_filename,
- .bdrv_child_perm = backup_top_child_perm,
+ .bdrv_child_perm = cbw_child_perm,
.is_filter = true,
};
-BlockDriverState *bdrv_backup_top_append(BlockDriverState *source,
- BlockDriverState *target,
- const char *filter_node_name,
- uint64_t cluster_size,
- BackupPerf *perf,
- BdrvRequestFlags write_flags,
- BlockCopyState **bcs,
- Error **errp)
+BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
+ BlockDriverState *target,
+ const char *filter_node_name,
+ uint64_t cluster_size,
+ BackupPerf *perf,
+ BdrvRequestFlags write_flags,
+ BlockCopyState **bcs,
+ Error **errp)
{
ERRP_GUARD();
int ret;
- BDRVBackupTopState *state;
+ BDRVCopyBeforeWriteState *state;
BlockDriverState *top;
bool appended = false;
assert(source->total_sectors == target->total_sectors);
- top = bdrv_new_open_driver(&bdrv_backup_top_filter, filter_node_name,
+ top = bdrv_new_open_driver(&bdrv_cbw_filter, filter_node_name,
BDRV_O_RDWR, errp);
if (!top) {
return NULL;
@@ -210,7 +210,7 @@ BlockDriverState *bdrv_backup_top_append(BlockDriverState *source,
ret = bdrv_append(top, source, errp);
if (ret < 0) {
- error_prepend(errp, "Cannot append backup-top filter: ");
+ error_prepend(errp, "Cannot append copy-before-write filter: ");
goto fail;
}
appended = true;
@@ -231,7 +231,7 @@ BlockDriverState *bdrv_backup_top_append(BlockDriverState *source,
fail:
if (appended) {
- bdrv_backup_top_drop(top);
+ bdrv_cbw_drop(top);
} else {
bdrv_unref(top);
}
@@ -241,9 +241,9 @@ fail:
return NULL;
}
-void bdrv_backup_top_drop(BlockDriverState *bs)
+void bdrv_cbw_drop(BlockDriverState *bs)
{
- BDRVBackupTopState *s = bs->opaque;
+ BDRVCopyBeforeWriteState *s = bs->opaque;
bdrv_drop_filter(bs, &error_abort);
diff --git a/MAINTAINERS b/MAINTAINERS
index 5f55404f2f..a27489a9d3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2283,8 +2283,8 @@ F: block/mirror.c
F: qapi/job.json
F: block/block-copy.c
F: include/block/block-copy.c
-F: block/backup-top.h
-F: block/backup-top.c
+F: block/copy-before-write.h
+F: block/copy-before-write.c
F: include/block/aio_task.h
F: block/aio_task.c
F: util/qemu-co-shared-resource.c
diff --git a/block/meson.build b/block/meson.build
index e687c54dbc..6e27aa9624 100644
--- a/block/meson.build
+++ b/block/meson.build
@@ -4,7 +4,7 @@ block_ss.add(files(
'aio_task.c',
'amend.c',
'backup.c',
- 'backup-top.c',
+ 'copy-before-write.c',
'blkdebug.c',
'blklogwrites.c',
'blkverify.c',
diff --git a/tests/qemu-iotests/283 b/tests/qemu-iotests/283
index 010c22f0a2..a09e0183ae 100755
--- a/tests/qemu-iotests/283
+++ b/tests/qemu-iotests/283
@@ -1,7 +1,7 @@
#!/usr/bin/env python3
# group: auto quick
#
-# Test for backup-top filter permission activation failure
+# Test for copy-before-write filter permission conflict
#
# Copyright (c) 2019 Virtuozzo International GmbH.
#
@@ -31,13 +31,13 @@ size = 1024 * 1024
""" Test description
When performing a backup, all writes on the source subtree must go through the
-backup-top filter so it can copy all data to the target before it is changed.
-backup-top filter is appended above source node, to achieve this thing, so all
-parents of source node are handled. A configuration with side parents of source
-sub-tree with write permission is unsupported (we'd have append several
-backup-top filter like nodes to handle such parents). The test create an
-example of such configuration and checks that a backup is then not allowed
-(blockdev-backup command should fail).
+copy-before-write filter so it can copy all data to the target before it is
+changed. copy-before-write filter is appended above source node, to achieve
+this thing, so all parents of source node are handled. A configuration with
+side parents of source sub-tree with write permission is unsupported (we'd have
+append several copy-before-write filter like nodes to handle such parents). The
+test create an example of such configuration and checks that a backup is then
+not allowed (blockdev-backup command should fail).
The configuration:
@@ -57,11 +57,10 @@ The configuration:
│ base │ ◀──────────── │ other │
└─────────────┘ └───────┘
-On activation (see .active field of backup-top state in block/backup-top.c),
-backup-top is going to unshare write permission on its source child. Write
-unsharing will be propagated to the "source->base" link and will conflict with
-other node write permission. So permission update will fail and backup job will
-not be started.
+copy-before-write filter wants to unshare write permission on its source child.
+Write unsharing will be propagated to the "source->base" link and will conflict
+with other node write permission. So permission update will fail and backup job
+will not be started.
Note, that the only thing which prevents backup of running on such
configuration is default permission propagation scheme. It may be altered by
@@ -99,13 +98,9 @@ vm.qmp_log('blockdev-backup', sync='full', device='source', target='target')
vm.shutdown()
-print('\n=== backup-top should be gone after job-finalize ===\n')
+print('\n=== copy-before-write filter should be gone after job-finalize ===\n')
-# Check that the backup-top node is gone after job-finalize.
-#
-# During finalization, the node becomes inactive and can no longer
-# function. If it is still present, new parents might be attached, and
-# there would be no meaningful way to handle their I/O requests.
+# Check that the copy-before-write node is gone after job-finalize.
vm = iotests.VM()
vm.launch()
@@ -131,7 +126,7 @@ vm.qmp_log('blockdev-backup',
vm.event_wait('BLOCK_JOB_PENDING', 5.0)
-# The backup-top filter should still be present prior to finalization
+# The copy-before-write filter should still be present prior to finalization
assert vm.node_info('backup-filter') is not None
vm.qmp_log('job-finalize', id='backup')
diff --git a/tests/qemu-iotests/283.out b/tests/qemu-iotests/283.out
index c6e12b15c5..f2b7219632 100644
--- a/tests/qemu-iotests/283.out
+++ b/tests/qemu-iotests/283.out
@@ -5,9 +5,9 @@
{"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 append backup-top filter: Permission conflict on node 'base': permissions 'write' are both required by node 'other' (uses node 'base' as 'image' child) and unshared by node 'source' (uses node 'base' as 'image' child)."}}
+{"error": {"class": "GenericError", "desc": "Cannot append copy-before-write filter: Permission conflict on node 'base': permissions 'write' are both required by node 'other' (uses node 'base' as 'image' child) and unshared by node 'source' (uses node 'base' as 'image' child)."}}
-=== backup-top should be gone after job-finalize ===
+=== copy-before-write filter should be gone after job-finalize ===
{"execute": "blockdev-add", "arguments": {"driver": "null-co", "node-name": "source"}}
{"return": {}}
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 08/35] block-copy: always set BDRV_REQ_SERIALISING flag
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (6 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 07/35] block: rename backup-top to copy-before-write Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 09/35] block/block-copy: introduce block_copy_set_copy_opts() Vladimir Sementsov-Ogievskiy
` (26 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
It won't hurt in common case, so let's not bother with detecting image
fleecing.
Also, we want to simplify initialization interface of copy-before-write
filter as we are going to make it public.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
block/copy-before-write.h | 2 +-
include/block/block-copy.h | 3 +--
block/backup.c | 21 +--------------------
block/block-copy.c | 29 ++++++++++++++++++++++++++---
block/copy-before-write.c | 4 ++--
5 files changed, 31 insertions(+), 28 deletions(-)
diff --git a/block/copy-before-write.h b/block/copy-before-write.h
index 5977b7aa31..f37e2249ae 100644
--- a/block/copy-before-write.h
+++ b/block/copy-before-write.h
@@ -34,7 +34,7 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
const char *filter_node_name,
uint64_t cluster_size,
BackupPerf *perf,
- BdrvRequestFlags write_flags,
+ bool compress,
BlockCopyState **bcs,
Error **errp);
void bdrv_cbw_drop(BlockDriverState *bs);
diff --git a/include/block/block-copy.h b/include/block/block-copy.h
index 338f2ea7fd..c013a20e1e 100644
--- a/include/block/block-copy.h
+++ b/include/block/block-copy.h
@@ -24,8 +24,7 @@ typedef struct BlockCopyCallState BlockCopyCallState;
BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
int64_t cluster_size, bool use_copy_range,
- BdrvRequestFlags write_flags,
- Error **errp);
+ bool compress, Error **errp);
void block_copy_set_progress_meter(BlockCopyState *s, ProgressMeter *pm);
diff --git a/block/backup.c b/block/backup.c
index ac91821b08..84f9a5f02c 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -407,7 +407,6 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
int64_t len, target_len;
BackupBlockJob *job = NULL;
int64_t cluster_size;
- BdrvRequestFlags write_flags;
BlockDriverState *cbw = NULL;
BlockCopyState *bcs = NULL;
@@ -504,26 +503,8 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
goto error;
}
- /*
- * If source is in backing chain of target assume that target is going to be
- * used for "image fleecing", i.e. it should represent a kind of snapshot of
- * source at backup-start point in time. And target is going to be read by
- * somebody (for example, used as NBD export) during backup job.
- *
- * In this case, we need to add BDRV_REQ_SERIALISING write flag to avoid
- * intersection of backup writes and third party reads from target,
- * otherwise reading from target we may occasionally read already updated by
- * guest data.
- *
- * For more information see commit f8d59dfb40bb and test
- * tests/qemu-iotests/222
- */
- write_flags = (bdrv_chain_contains(target, bs) ? BDRV_REQ_SERIALISING : 0) |
- (compress ? BDRV_REQ_WRITE_COMPRESSED : 0),
-
cbw = bdrv_cbw_append(bs, target, filter_node_name,
- cluster_size, perf,
- write_flags, &bcs, errp);
+ cluster_size, perf, compress, &bcs, errp);
if (!cbw) {
goto error;
}
diff --git a/block/block-copy.c b/block/block-copy.c
index 5808cfe657..22a7c64c10 100644
--- a/block/block-copy.c
+++ b/block/block-copy.c
@@ -247,7 +247,7 @@ static uint32_t block_copy_max_transfer(BdrvChild *source, BdrvChild *target)
BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
int64_t cluster_size, bool use_copy_range,
- BdrvRequestFlags write_flags, Error **errp)
+ bool compress, Error **errp)
{
BlockCopyState *s;
BdrvDirtyBitmap *copy_bitmap;
@@ -259,6 +259,28 @@ BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
}
bdrv_disable_dirty_bitmap(copy_bitmap);
+ /*
+ * Why we always set BDRV_REQ_SERIALISING write flag:
+ *
+ * Assume source is in backing chain of target assume that target is going
+ * to be used for "image fleecing", i.e. it should represent a kind of
+ * snapshot of source at backup-start point in time. And target is going to
+ * be read by somebody (for example, used as NBD export) during backup job.
+ *
+ * In this case, we need to add BDRV_REQ_SERIALISING write flag to avoid
+ * intersection of backup writes and third party reads from target,
+ * otherwise reading from target we may occasionally read already updated by
+ * guest data.
+ *
+ * For more information see commit f8d59dfb40bb and test
+ * tests/qemu-iotests/222
+ *
+ * Other cases? The only known reasonable case is "just copy to target, and
+ * target is not used for something else". In this case BDRV_REQ_SERIALISING
+ * change nothing, so let's not bother with detecting the "image fleecing"
+ * case and enabling BDRV_REQ_SERIALISING only for it.
+ */
+
s = g_new(BlockCopyState, 1);
*s = (BlockCopyState) {
.source = source,
@@ -266,7 +288,8 @@ BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
.copy_bitmap = copy_bitmap,
.cluster_size = cluster_size,
.len = bdrv_dirty_bitmap_size(copy_bitmap),
- .write_flags = write_flags,
+ .write_flags = BDRV_REQ_SERIALISING |
+ (compress ? BDRV_REQ_WRITE_COMPRESSED : 0),
.mem = shres_create(BLOCK_COPY_MAX_MEM),
};
@@ -279,7 +302,7 @@ BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
*/
s->use_copy_range = false;
s->copy_size = cluster_size;
- } else if (write_flags & BDRV_REQ_WRITE_COMPRESSED) {
+ } else if (compress) {
/* Compression supports only cluster-size writes and no copy-range. */
s->use_copy_range = false;
s->copy_size = cluster_size;
diff --git a/block/copy-before-write.c b/block/copy-before-write.c
index 0dc5a107cf..4337076c1c 100644
--- a/block/copy-before-write.c
+++ b/block/copy-before-write.c
@@ -171,7 +171,7 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
const char *filter_node_name,
uint64_t cluster_size,
BackupPerf *perf,
- BdrvRequestFlags write_flags,
+ bool compress,
BlockCopyState **bcs,
Error **errp)
{
@@ -218,7 +218,7 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
state->cluster_size = cluster_size;
state->bcs = block_copy_state_new(top->backing, state->target,
cluster_size, perf->use_copy_range,
- write_flags, errp);
+ compress, errp);
if (!state->bcs) {
error_prepend(errp, "Cannot create block-copy-state: ");
goto fail;
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 09/35] block/block-copy: introduce block_copy_set_copy_opts()
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (7 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 08/35] block-copy: always set BDRV_REQ_SERIALISING flag Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 10/35] block/backup: set copy_range and compress after filter insertion Vladimir Sementsov-Ogievskiy
` (25 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
We'll need a possibility to set compress and use_copy_range options
after initialization of the state. So make corresponding part of
block_copy_state_new() separate and public.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
include/block/block-copy.h | 2 ++
block/block-copy.c | 56 ++++++++++++++++++++++----------------
2 files changed, 35 insertions(+), 23 deletions(-)
diff --git a/include/block/block-copy.h b/include/block/block-copy.h
index c013a20e1e..b74fb80067 100644
--- a/include/block/block-copy.h
+++ b/include/block/block-copy.h
@@ -26,6 +26,8 @@ BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
int64_t cluster_size, bool use_copy_range,
bool compress, Error **errp);
+void block_copy_set_copy_opts(BlockCopyState *s, bool use_copy_range,
+ bool compress);
void block_copy_set_progress_meter(BlockCopyState *s, ProgressMeter *pm);
void block_copy_state_free(BlockCopyState *s);
diff --git a/block/block-copy.c b/block/block-copy.c
index 22a7c64c10..8baf8b9403 100644
--- a/block/block-copy.c
+++ b/block/block-copy.c
@@ -245,6 +245,37 @@ static uint32_t block_copy_max_transfer(BdrvChild *source, BdrvChild *target)
target->bs->bl.max_transfer));
}
+/* Function should be called prior any actual copy request */
+void block_copy_set_copy_opts(BlockCopyState *s, bool use_copy_range,
+ bool compress)
+{
+ if (compress) {
+ s->write_flags |= BDRV_REQ_WRITE_COMPRESSED;
+ }
+
+ if (block_copy_max_transfer(s->source, s->target) < s->cluster_size) {
+ /*
+ * copy_range does not respect max_transfer. We don't want to bother
+ * with requests smaller than block-copy cluster size, so fallback to
+ * buffered copying (read and write respect max_transfer on their
+ * behalf).
+ */
+ s->use_copy_range = false;
+ s->copy_size = s->cluster_size;
+ } else if (compress) {
+ /* Compression supports only cluster-size writes and no copy-range. */
+ s->use_copy_range = false;
+ s->copy_size = s->cluster_size;
+ } else {
+ /*
+ * We enable copy-range, but keep small copy_size, until first
+ * successful copy_range (look at block_copy_do_copy).
+ */
+ s->use_copy_range = use_copy_range;
+ s->copy_size = MAX(s->cluster_size, BLOCK_COPY_MAX_BUFFER);
+ }
+}
+
BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
int64_t cluster_size, bool use_copy_range,
bool compress, Error **errp)
@@ -288,32 +319,11 @@ BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
.copy_bitmap = copy_bitmap,
.cluster_size = cluster_size,
.len = bdrv_dirty_bitmap_size(copy_bitmap),
- .write_flags = BDRV_REQ_SERIALISING |
- (compress ? BDRV_REQ_WRITE_COMPRESSED : 0),
+ .write_flags = BDRV_REQ_SERIALISING,
.mem = shres_create(BLOCK_COPY_MAX_MEM),
};
- if (block_copy_max_transfer(source, target) < cluster_size) {
- /*
- * copy_range does not respect max_transfer. We don't want to bother
- * with requests smaller than block-copy cluster size, so fallback to
- * buffered copying (read and write respect max_transfer on their
- * behalf).
- */
- s->use_copy_range = false;
- s->copy_size = cluster_size;
- } else if (compress) {
- /* Compression supports only cluster-size writes and no copy-range. */
- s->use_copy_range = false;
- s->copy_size = cluster_size;
- } else {
- /*
- * We enable copy-range, but keep small copy_size, until first
- * successful copy_range (look at block_copy_do_copy).
- */
- s->use_copy_range = use_copy_range;
- s->copy_size = MAX(s->cluster_size, BLOCK_COPY_MAX_BUFFER);
- }
+ block_copy_set_copy_opts(s, use_copy_range, compress);
ratelimit_init(&s->rate_limit);
QLIST_INIT(&s->tasks);
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 10/35] block/backup: set copy_range and compress after filter insertion
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (8 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 09/35] block/block-copy: introduce block_copy_set_copy_opts() Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 11/35] block/backup: move cluster size calculation to block-copy Vladimir Sementsov-Ogievskiy
` (24 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
We are going to publish copy-before-write filter, so it would be
initialized through options. Still we don't want to publish compress
and copy-range options, as
1. Modern way to enable compression is to use compress filter.
2. For copy-range it's unclean how to make proper interface:
- it's has experimental prefix for backup job anyway
- the whole BackupPerf structure doesn't make sense for the filter
So, let's just add copy-range possibility to the filter later if
needed.
Still, we are going to continue support for compression and
experimental copy-range in backup job. So, set these options after
filter creation.
Note, that we can drop "compress" argument of bdrv_cbw_append() now, as
well as "perf". The only reason not doing so is that now, when I
prepare this patch the big series around it is already reviewed and I
want to avoid extra rebase conflicts to simplify review of the
following version.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/copy-before-write.h | 1 -
block/backup.c | 3 ++-
block/copy-before-write.c | 4 +---
3 files changed, 3 insertions(+), 5 deletions(-)
diff --git a/block/copy-before-write.h b/block/copy-before-write.h
index f37e2249ae..538aab8bdb 100644
--- a/block/copy-before-write.h
+++ b/block/copy-before-write.h
@@ -33,7 +33,6 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
BlockDriverState *target,
const char *filter_node_name,
uint64_t cluster_size,
- BackupPerf *perf,
bool compress,
BlockCopyState **bcs,
Error **errp);
diff --git a/block/backup.c b/block/backup.c
index 84f9a5f02c..b31fd99ab3 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -504,7 +504,7 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
}
cbw = bdrv_cbw_append(bs, target, filter_node_name,
- cluster_size, perf, compress, &bcs, errp);
+ cluster_size, false, &bcs, errp);
if (!cbw) {
goto error;
}
@@ -530,6 +530,7 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
job->len = len;
job->perf = *perf;
+ block_copy_set_copy_opts(bcs, perf->use_copy_range, compress);
block_copy_set_progress_meter(bcs, &job->common.job.progress);
block_copy_set_speed(bcs, speed);
diff --git a/block/copy-before-write.c b/block/copy-before-write.c
index 4337076c1c..235251a640 100644
--- a/block/copy-before-write.c
+++ b/block/copy-before-write.c
@@ -170,7 +170,6 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
BlockDriverState *target,
const char *filter_node_name,
uint64_t cluster_size,
- BackupPerf *perf,
bool compress,
BlockCopyState **bcs,
Error **errp)
@@ -217,8 +216,7 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
state->cluster_size = cluster_size;
state->bcs = block_copy_state_new(top->backing, state->target,
- cluster_size, perf->use_copy_range,
- compress, errp);
+ cluster_size, false, compress, errp);
if (!state->bcs) {
error_prepend(errp, "Cannot create block-copy-state: ");
goto fail;
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 11/35] block/backup: move cluster size calculation to block-copy
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (9 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 10/35] block/backup: set copy_range and compress after filter insertion Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 12/35] block/copy-before-write: relax permission requirements when no parents Vladimir Sementsov-Ogievskiy
` (23 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
The main consumer of cluster-size is block-copy. Let's calculate it
here instead of passing through backup-top.
We are going to publish copy-before-write filter soon, so it will be
created through options. But we don't want for now to make explicit
option for cluster-size, let's continue to calculate it automatically.
So, now is the time to get rid of cluster_size argument for
bdrv_cbw_append().
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
block/copy-before-write.h | 1 -
include/block/block-copy.h | 5 +--
block/backup.c | 62 ++++++--------------------------------
block/block-copy.c | 51 ++++++++++++++++++++++++++++++-
block/copy-before-write.c | 10 +++---
5 files changed, 66 insertions(+), 63 deletions(-)
diff --git a/block/copy-before-write.h b/block/copy-before-write.h
index 538aab8bdb..b386fd8f01 100644
--- a/block/copy-before-write.h
+++ b/block/copy-before-write.h
@@ -32,7 +32,6 @@
BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
BlockDriverState *target,
const char *filter_node_name,
- uint64_t cluster_size,
bool compress,
BlockCopyState **bcs,
Error **errp);
diff --git a/include/block/block-copy.h b/include/block/block-copy.h
index b74fb80067..e81cd952f7 100644
--- a/include/block/block-copy.h
+++ b/include/block/block-copy.h
@@ -23,8 +23,8 @@ typedef struct BlockCopyState BlockCopyState;
typedef struct BlockCopyCallState BlockCopyCallState;
BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
- int64_t cluster_size, bool use_copy_range,
- bool compress, Error **errp);
+ bool use_copy_range, bool compress,
+ Error **errp);
void block_copy_set_copy_opts(BlockCopyState *s, bool use_copy_range,
bool compress);
@@ -88,6 +88,7 @@ void block_copy_kick(BlockCopyCallState *call_state);
void block_copy_call_cancel(BlockCopyCallState *call_state);
BdrvDirtyBitmap *block_copy_dirty_bitmap(BlockCopyState *s);
+int64_t block_copy_cluster_size(BlockCopyState *s);
void block_copy_set_skip_unallocated(BlockCopyState *s, bool skip);
#endif /* BLOCK_COPY_H */
diff --git a/block/backup.c b/block/backup.c
index b31fd99ab3..83516297cb 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -29,8 +29,6 @@
#include "block/copy-before-write.h"
-#define BACKUP_CLUSTER_SIZE_DEFAULT (1 << 16)
-
typedef struct BackupBlockJob {
BlockJob common;
BlockDriverState *cbw;
@@ -354,43 +352,6 @@ static const BlockJobDriver backup_job_driver = {
.set_speed = backup_set_speed,
};
-static int64_t backup_calculate_cluster_size(BlockDriverState *target,
- Error **errp)
-{
- int ret;
- BlockDriverInfo bdi;
- bool target_does_cow = bdrv_backing_chain_next(target);
-
- /*
- * If there is no backing file on the target, we cannot rely on COW if our
- * backup cluster size is smaller than the target cluster size. Even for
- * targets with a backing file, try to avoid COW if possible.
- */
- ret = bdrv_get_info(target, &bdi);
- if (ret == -ENOTSUP && !target_does_cow) {
- /* Cluster size is not defined */
- warn_report("The target block device doesn't provide "
- "information about the block size and it doesn't have a "
- "backing file. The default block size of %u bytes is "
- "used. If the actual block size of the target exceeds "
- "this default, the backup may be unusable",
- BACKUP_CLUSTER_SIZE_DEFAULT);
- return BACKUP_CLUSTER_SIZE_DEFAULT;
- } else if (ret < 0 && !target_does_cow) {
- error_setg_errno(errp, -ret,
- "Couldn't determine the cluster size of the target image, "
- "which has no backing file");
- error_append_hint(errp,
- "Aborting, since this may create an unusable destination image\n");
- return ret;
- } else if (ret < 0 && target_does_cow) {
- /* Not fatal; just trudge on ahead. */
- return BACKUP_CLUSTER_SIZE_DEFAULT;
- }
-
- return MAX(BACKUP_CLUSTER_SIZE_DEFAULT, bdi.cluster_size);
-}
-
BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
BlockDriverState *target, int64_t speed,
MirrorSyncMode sync_mode, BdrvDirtyBitmap *sync_bitmap,
@@ -448,11 +409,6 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
return NULL;
}
- cluster_size = backup_calculate_cluster_size(target, errp);
- if (cluster_size < 0) {
- goto error;
- }
-
if (perf->max_workers < 1) {
error_setg(errp, "max-workers must be greater than zero");
return NULL;
@@ -464,13 +420,6 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
return NULL;
}
- if (perf->max_chunk && perf->max_chunk < cluster_size) {
- error_setg(errp, "Required max-chunk (%" PRIi64 ") is less than backup "
- "cluster size (%" PRIi64 ")", perf->max_chunk, cluster_size);
- return NULL;
- }
-
-
if (sync_bitmap) {
/* If we need to write to this bitmap, check that we can: */
if (bitmap_mode != BITMAP_SYNC_MODE_NEVER &&
@@ -503,12 +452,19 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
goto error;
}
- cbw = bdrv_cbw_append(bs, target, filter_node_name,
- cluster_size, false, &bcs, errp);
+ cbw = bdrv_cbw_append(bs, target, filter_node_name, false, &bcs, errp);
if (!cbw) {
goto error;
}
+ cluster_size = block_copy_cluster_size(bcs);
+
+ if (perf->max_chunk && perf->max_chunk < cluster_size) {
+ error_setg(errp, "Required max-chunk (%" PRIi64 ") is less than backup "
+ "cluster size (%" PRIi64 ")", perf->max_chunk, cluster_size);
+ goto error;
+ }
+
/* job->len is fixed, so we can't allow resize */
job = block_job_create(job_id, &backup_job_driver, txn, cbw,
0, BLK_PERM_ALL,
diff --git a/block/block-copy.c b/block/block-copy.c
index 8baf8b9403..774f5029bb 100644
--- a/block/block-copy.c
+++ b/block/block-copy.c
@@ -27,6 +27,7 @@
#define BLOCK_COPY_MAX_MEM (128 * MiB)
#define BLOCK_COPY_MAX_WORKERS 64
#define BLOCK_COPY_SLICE_TIME 100000000ULL /* ns */
+#define BLOCK_COPY_CLUSTER_SIZE_DEFAULT (1 << 16)
static coroutine_fn int block_copy_task_entry(AioTask *task);
@@ -276,13 +277,56 @@ void block_copy_set_copy_opts(BlockCopyState *s, bool use_copy_range,
}
}
+static int64_t block_copy_calculate_cluster_size(BlockDriverState *target,
+ Error **errp)
+{
+ int ret;
+ BlockDriverInfo bdi;
+ bool target_does_cow = bdrv_backing_chain_next(target);
+
+ /*
+ * If there is no backing file on the target, we cannot rely on COW if our
+ * backup cluster size is smaller than the target cluster size. Even for
+ * targets with a backing file, try to avoid COW if possible.
+ */
+ ret = bdrv_get_info(target, &bdi);
+ if (ret == -ENOTSUP && !target_does_cow) {
+ /* Cluster size is not defined */
+ warn_report("The target block device doesn't provide "
+ "information about the block size and it doesn't have a "
+ "backing file. The default block size of %u bytes is "
+ "used. If the actual block size of the target exceeds "
+ "this default, the backup may be unusable",
+ BLOCK_COPY_CLUSTER_SIZE_DEFAULT);
+ return BLOCK_COPY_CLUSTER_SIZE_DEFAULT;
+ } else if (ret < 0 && !target_does_cow) {
+ error_setg_errno(errp, -ret,
+ "Couldn't determine the cluster size of the target image, "
+ "which has no backing file");
+ error_append_hint(errp,
+ "Aborting, since this may create an unusable destination image\n");
+ return ret;
+ } else if (ret < 0 && target_does_cow) {
+ /* Not fatal; just trudge on ahead. */
+ return BLOCK_COPY_CLUSTER_SIZE_DEFAULT;
+ }
+
+ return MAX(BLOCK_COPY_CLUSTER_SIZE_DEFAULT, bdi.cluster_size);
+}
+
BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
- int64_t cluster_size, bool use_copy_range,
+ bool use_copy_range,
bool compress, Error **errp)
{
BlockCopyState *s;
+ int64_t cluster_size;
BdrvDirtyBitmap *copy_bitmap;
+ cluster_size = block_copy_calculate_cluster_size(target->bs, errp);
+ if (cluster_size < 0) {
+ return NULL;
+ }
+
copy_bitmap = bdrv_create_dirty_bitmap(source->bs, cluster_size, NULL,
errp);
if (!copy_bitmap) {
@@ -879,6 +923,11 @@ BdrvDirtyBitmap *block_copy_dirty_bitmap(BlockCopyState *s)
return s->copy_bitmap;
}
+int64_t block_copy_cluster_size(BlockCopyState *s)
+{
+ return s->cluster_size;
+}
+
void block_copy_set_skip_unallocated(BlockCopyState *s, bool skip)
{
s->skip_unallocated = skip;
diff --git a/block/copy-before-write.c b/block/copy-before-write.c
index 235251a640..a7996d54db 100644
--- a/block/copy-before-write.c
+++ b/block/copy-before-write.c
@@ -37,7 +37,6 @@
typedef struct BDRVCopyBeforeWriteState {
BlockCopyState *bcs;
BdrvChild *target;
- int64_t cluster_size;
} BDRVCopyBeforeWriteState;
static coroutine_fn int cbw_co_preadv(
@@ -52,13 +51,14 @@ static coroutine_fn int cbw_do_copy_before_write(BlockDriverState *bs,
{
BDRVCopyBeforeWriteState *s = bs->opaque;
uint64_t off, end;
+ int64_t cluster_size = block_copy_cluster_size(s->bcs);
if (flags & BDRV_REQ_WRITE_UNCHANGED) {
return 0;
}
- off = QEMU_ALIGN_DOWN(offset, s->cluster_size);
- end = QEMU_ALIGN_UP(offset + bytes, s->cluster_size);
+ off = QEMU_ALIGN_DOWN(offset, cluster_size);
+ end = QEMU_ALIGN_UP(offset + bytes, cluster_size);
return block_copy(s->bcs, off, end - off, true);
}
@@ -169,7 +169,6 @@ BlockDriver bdrv_cbw_filter = {
BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
BlockDriverState *target,
const char *filter_node_name,
- uint64_t cluster_size,
bool compress,
BlockCopyState **bcs,
Error **errp)
@@ -214,9 +213,8 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
}
appended = true;
- state->cluster_size = cluster_size;
state->bcs = block_copy_state_new(top->backing, state->target,
- cluster_size, false, compress, errp);
+ false, compress, errp);
if (!state->bcs) {
error_prepend(errp, "Cannot create block-copy-state: ");
goto fail;
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 12/35] block/copy-before-write: relax permission requirements when no parents
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (10 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 11/35] block/backup: move cluster size calculation to block-copy Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 13/35] block/copy-before-write: drop extra bdrv_unref on failure path Vladimir Sementsov-Ogievskiy
` (22 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
We are going to publish copy-before-write filter. So, user should be
able to create it with blockdev-add first, specifying both filtered and
target children. And then do blockdev-reopen, to actually insert the
filter where needed.
Currently, filter unshares write permission unconditionally on source
node. It's good, but it will not allow to do blockdev-add. So, let's
relax restrictions when filter doesn't have any parent.
Test output is modified, as now permission conflict happens only when
job creates a blk parent for filter node.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
block/copy-before-write.c | 8 +++++---
tests/qemu-iotests/283.out | 2 +-
2 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/block/copy-before-write.c b/block/copy-before-write.c
index a7996d54db..2a51cc64e4 100644
--- a/block/copy-before-write.c
+++ b/block/copy-before-write.c
@@ -142,10 +142,12 @@ static void cbw_child_perm(BlockDriverState *bs, BdrvChild *c,
bdrv_default_perms(bs, c, role, reopen_queue,
perm, shared, nperm, nshared);
- if (perm & BLK_PERM_WRITE) {
- *nperm = *nperm | BLK_PERM_CONSISTENT_READ;
+ if (!QLIST_EMPTY(&bs->parents)) {
+ if (perm & BLK_PERM_WRITE) {
+ *nperm = *nperm | BLK_PERM_CONSISTENT_READ;
+ }
+ *nshared &= ~(BLK_PERM_WRITE | BLK_PERM_RESIZE);
}
- *nshared &= ~(BLK_PERM_WRITE | BLK_PERM_RESIZE);
}
}
diff --git a/tests/qemu-iotests/283.out b/tests/qemu-iotests/283.out
index f2b7219632..5bb75952ef 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 append copy-before-write filter: Permission conflict on node 'base': permissions 'write' are both required by node 'other' (uses node 'base' as 'image' child) and unshared by node 'source' (uses node 'base' as 'image' child)."}}
+{"error": {"class": "GenericError", "desc": "Permission conflict on node 'base': permissions 'write' are both required by node 'other' (uses node 'base' as 'image' child) and unshared by node 'source' (uses node 'base' as 'image' child)."}}
=== copy-before-write filter should be gone after job-finalize ===
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 13/35] block/copy-before-write: drop extra bdrv_unref on failure path
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (11 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 12/35] block/copy-before-write: relax permission requirements when no parents Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 14/35] block/copy-before-write: use file child instead of backing Vladimir Sementsov-Ogievskiy
` (21 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
bdrv_attach_child() do bdrv_unref() on failure, so we shouldn't do it
by hand here.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
block/copy-before-write.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/block/copy-before-write.c b/block/copy-before-write.c
index 2a51cc64e4..945d9340f4 100644
--- a/block/copy-before-write.c
+++ b/block/copy-before-write.c
@@ -201,7 +201,6 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
state->target = bdrv_attach_child(top, target, "target", &child_of_bds,
BDRV_CHILD_DATA, errp);
if (!state->target) {
- bdrv_unref(target);
bdrv_unref(top);
return NULL;
}
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 14/35] block/copy-before-write: use file child instead of backing
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (12 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 13/35] block/copy-before-write: drop extra bdrv_unref on failure path Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 15/35] block/copy-before-write: bdrv_cbw_append(): replace child at last Vladimir Sementsov-Ogievskiy
` (20 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
We are going to publish copy-before-write filter, and there no public
backing-child-based filter in Qemu. No reason to create a precedent, so
let's refactor copy-before-write filter instead.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
block/copy-before-write.c | 39 ++++++++++++++++++++++-----------------
1 file changed, 22 insertions(+), 17 deletions(-)
diff --git a/block/copy-before-write.c b/block/copy-before-write.c
index 945d9340f4..7a6c15f141 100644
--- a/block/copy-before-write.c
+++ b/block/copy-before-write.c
@@ -43,7 +43,7 @@ static coroutine_fn int cbw_co_preadv(
BlockDriverState *bs, uint64_t offset, uint64_t bytes,
QEMUIOVector *qiov, int flags)
{
- return bdrv_co_preadv(bs->backing, offset, bytes, qiov, flags);
+ return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags);
}
static coroutine_fn int cbw_do_copy_before_write(BlockDriverState *bs,
@@ -71,7 +71,7 @@ static int coroutine_fn cbw_co_pdiscard(BlockDriverState *bs,
return ret;
}
- return bdrv_co_pdiscard(bs->backing, offset, bytes);
+ return bdrv_co_pdiscard(bs->file, offset, bytes);
}
static int coroutine_fn cbw_co_pwrite_zeroes(BlockDriverState *bs,
@@ -82,7 +82,7 @@ static int coroutine_fn cbw_co_pwrite_zeroes(BlockDriverState *bs,
return ret;
}
- return bdrv_co_pwrite_zeroes(bs->backing, offset, bytes, flags);
+ return bdrv_co_pwrite_zeroes(bs->file, offset, bytes, flags);
}
static coroutine_fn int cbw_co_pwritev(BlockDriverState *bs,
@@ -95,29 +95,22 @@ static coroutine_fn int cbw_co_pwritev(BlockDriverState *bs,
return ret;
}
- return bdrv_co_pwritev(bs->backing, offset, bytes, qiov, flags);
+ return bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags);
}
static int coroutine_fn cbw_co_flush(BlockDriverState *bs)
{
- if (!bs->backing) {
+ if (!bs->file) {
return 0;
}
- return bdrv_co_flush(bs->backing->bs);
+ return bdrv_co_flush(bs->file->bs);
}
static void cbw_refresh_filename(BlockDriverState *bs)
{
- if (bs->backing == NULL) {
- /*
- * we can be here after failed bdrv_attach_child in
- * bdrv_set_backing_hd
- */
- return;
- }
pstrcpy(bs->exact_filename, sizeof(bs->exact_filename),
- bs->backing->bs->filename);
+ bs->file->bs->filename);
}
static void cbw_child_perm(BlockDriverState *bs, BdrvChild *c,
@@ -186,6 +179,7 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
top = bdrv_new_open_driver(&bdrv_cbw_filter, filter_node_name,
BDRV_O_RDWR, errp);
if (!top) {
+ error_prepend(errp, "Cannot open driver: ");
return NULL;
}
@@ -201,21 +195,32 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
state->target = bdrv_attach_child(top, target, "target", &child_of_bds,
BDRV_CHILD_DATA, errp);
if (!state->target) {
+ error_prepend(errp, "Cannot attach target child: ");
+ bdrv_unref(top);
+ return NULL;
+ }
+
+ bdrv_ref(source);
+ top->file = bdrv_attach_child(top, source, "file", &child_of_bds,
+ BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
+ errp);
+ if (!top->file) {
+ error_prepend(errp, "Cannot attach file child: ");
bdrv_unref(top);
return NULL;
}
bdrv_drained_begin(source);
- ret = bdrv_append(top, source, errp);
+ ret = bdrv_replace_node(source, top, errp);
if (ret < 0) {
error_prepend(errp, "Cannot append copy-before-write filter: ");
goto fail;
}
appended = true;
- state->bcs = block_copy_state_new(top->backing, state->target,
- false, compress, errp);
+ state->bcs = block_copy_state_new(top->file, state->target, false, compress,
+ errp);
if (!state->bcs) {
error_prepend(errp, "Cannot create block-copy-state: ");
goto fail;
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 15/35] block/copy-before-write: bdrv_cbw_append(): replace child at last
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (13 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 14/35] block/copy-before-write: use file child instead of backing Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 16/35] block/copy-before-write: introduce cbw_init() Vladimir Sementsov-Ogievskiy
` (19 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
Refactor the function to replace child at last. Thus we don't need to
revert it and code is simplified.
block-copy state initialization being done before replacing the child
doesn't need any drained section.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
block/copy-before-write.c | 33 +++++++++++----------------------
1 file changed, 11 insertions(+), 22 deletions(-)
diff --git a/block/copy-before-write.c b/block/copy-before-write.c
index 7a6c15f141..adbbc64aa9 100644
--- a/block/copy-before-write.c
+++ b/block/copy-before-write.c
@@ -172,7 +172,6 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
int ret;
BDRVCopyBeforeWriteState *state;
BlockDriverState *top;
- bool appended = false;
assert(source->total_sectors == target->total_sectors);
@@ -196,8 +195,7 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
BDRV_CHILD_DATA, errp);
if (!state->target) {
error_prepend(errp, "Cannot attach target child: ");
- bdrv_unref(top);
- return NULL;
+ goto fail;
}
bdrv_ref(source);
@@ -206,18 +204,8 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
errp);
if (!top->file) {
error_prepend(errp, "Cannot attach file child: ");
- bdrv_unref(top);
- return NULL;
- }
-
- bdrv_drained_begin(source);
-
- ret = bdrv_replace_node(source, top, errp);
- if (ret < 0) {
- error_prepend(errp, "Cannot append copy-before-write filter: ");
goto fail;
}
- appended = true;
state->bcs = block_copy_state_new(top->file, state->target, false, compress,
errp);
@@ -225,21 +213,22 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
error_prepend(errp, "Cannot create block-copy-state: ");
goto fail;
}
- *bcs = state->bcs;
+ bdrv_drained_begin(source);
+ ret = bdrv_replace_node(source, top, errp);
bdrv_drained_end(source);
+ if (ret < 0) {
+ error_prepend(errp, "Cannot append copy-before-write filter: ");
+ goto fail;
+ }
+
+ *bcs = state->bcs;
return top;
fail:
- if (appended) {
- bdrv_cbw_drop(top);
- } else {
- bdrv_unref(top);
- }
-
- bdrv_drained_end(source);
-
+ block_copy_state_free(state->bcs);
+ bdrv_unref(top);
return NULL;
}
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 16/35] block/copy-before-write: introduce cbw_init()
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (14 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 15/35] block/copy-before-write: bdrv_cbw_append(): replace child at last Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 17/35] block/copy-before-write: cbw_init(): rename variables Vladimir Sementsov-Ogievskiy
` (18 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
Move part of bdrv_cbw_append() to new function cbw_open(). It's an
intermediate step for adding normal .bdrv_open() handler to the
filter. With this commit no logic is changed, but we have a function
which will be turned into .bdrv_open() handler in future commit.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
block/copy-before-write.c | 69 +++++++++++++++++++++++----------------
1 file changed, 41 insertions(+), 28 deletions(-)
diff --git a/block/copy-before-write.c b/block/copy-before-write.c
index adbbc64aa9..a4fee645fd 100644
--- a/block/copy-before-write.c
+++ b/block/copy-before-write.c
@@ -144,6 +144,45 @@ static void cbw_child_perm(BlockDriverState *bs, BdrvChild *c,
}
}
+static int cbw_init(BlockDriverState *top, BlockDriverState *source,
+ BlockDriverState *target, bool compress, Error **errp)
+{
+ BDRVCopyBeforeWriteState *state = top->opaque;
+
+ top->total_sectors = source->total_sectors;
+ top->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED |
+ (BDRV_REQ_FUA & source->supported_write_flags);
+ top->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED |
+ ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) &
+ source->supported_zero_flags);
+
+ bdrv_ref(target);
+ state->target = bdrv_attach_child(top, target, "target", &child_of_bds,
+ BDRV_CHILD_DATA, errp);
+ if (!state->target) {
+ error_prepend(errp, "Cannot attach target child: ");
+ return -EINVAL;
+ }
+
+ bdrv_ref(source);
+ top->file = bdrv_attach_child(top, source, "file", &child_of_bds,
+ BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
+ errp);
+ if (!top->file) {
+ error_prepend(errp, "Cannot attach file child: ");
+ return -EINVAL;
+ }
+
+ state->bcs = block_copy_state_new(top->file, state->target, false, compress,
+ errp);
+ if (!state->bcs) {
+ error_prepend(errp, "Cannot create block-copy-state: ");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
BlockDriver bdrv_cbw_filter = {
.format_name = "copy-before-write",
.instance_size = sizeof(BDRVCopyBeforeWriteState),
@@ -181,36 +220,10 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
error_prepend(errp, "Cannot open driver: ");
return NULL;
}
-
state = top->opaque;
- top->total_sectors = source->total_sectors;
- top->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED |
- (BDRV_REQ_FUA & source->supported_write_flags);
- top->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED |
- ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) &
- source->supported_zero_flags);
-
- bdrv_ref(target);
- state->target = bdrv_attach_child(top, target, "target", &child_of_bds,
- BDRV_CHILD_DATA, errp);
- if (!state->target) {
- error_prepend(errp, "Cannot attach target child: ");
- goto fail;
- }
- bdrv_ref(source);
- top->file = bdrv_attach_child(top, source, "file", &child_of_bds,
- BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
- errp);
- if (!top->file) {
- error_prepend(errp, "Cannot attach file child: ");
- goto fail;
- }
-
- state->bcs = block_copy_state_new(top->file, state->target, false, compress,
- errp);
- if (!state->bcs) {
- error_prepend(errp, "Cannot create block-copy-state: ");
+ ret = cbw_init(top, source, target, compress, errp);
+ if (ret < 0) {
goto fail;
}
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 17/35] block/copy-before-write: cbw_init(): rename variables
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (15 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 16/35] block/copy-before-write: introduce cbw_init() Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 18/35] block/copy-before-write: cbw_init(): use file child after attaching Vladimir Sementsov-Ogievskiy
` (17 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
One more step closer to real .bdrv_open() handler: use more usual names
for bs being initialized and its state.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
block/copy-before-write.c | 29 ++++++++++++++---------------
1 file changed, 14 insertions(+), 15 deletions(-)
diff --git a/block/copy-before-write.c b/block/copy-before-write.c
index a4fee645fd..d7f1833efa 100644
--- a/block/copy-before-write.c
+++ b/block/copy-before-write.c
@@ -144,38 +144,37 @@ static void cbw_child_perm(BlockDriverState *bs, BdrvChild *c,
}
}
-static int cbw_init(BlockDriverState *top, BlockDriverState *source,
+static int cbw_init(BlockDriverState *bs, BlockDriverState *source,
BlockDriverState *target, bool compress, Error **errp)
{
- BDRVCopyBeforeWriteState *state = top->opaque;
+ BDRVCopyBeforeWriteState *s = bs->opaque;
- top->total_sectors = source->total_sectors;
- top->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED |
+ bs->total_sectors = source->total_sectors;
+ bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED |
(BDRV_REQ_FUA & source->supported_write_flags);
- top->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED |
+ bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED |
((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) &
source->supported_zero_flags);
bdrv_ref(target);
- state->target = bdrv_attach_child(top, target, "target", &child_of_bds,
- BDRV_CHILD_DATA, errp);
- if (!state->target) {
+ s->target = bdrv_attach_child(bs, target, "target", &child_of_bds,
+ BDRV_CHILD_DATA, errp);
+ if (!s->target) {
error_prepend(errp, "Cannot attach target child: ");
return -EINVAL;
}
bdrv_ref(source);
- top->file = bdrv_attach_child(top, source, "file", &child_of_bds,
- BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
- errp);
- if (!top->file) {
+ bs->file = bdrv_attach_child(bs, source, "file", &child_of_bds,
+ BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
+ errp);
+ if (!bs->file) {
error_prepend(errp, "Cannot attach file child: ");
return -EINVAL;
}
- state->bcs = block_copy_state_new(top->file, state->target, false, compress,
- errp);
- if (!state->bcs) {
+ s->bcs = block_copy_state_new(bs->file, s->target, false, compress, errp);
+ if (!s->bcs) {
error_prepend(errp, "Cannot create block-copy-state: ");
return -EINVAL;
}
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 18/35] block/copy-before-write: cbw_init(): use file child after attaching
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (16 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 17/35] block/copy-before-write: cbw_init(): rename variables Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 19/35] block/copy-before-write: bdrv_cbw_append(): drop unused compress arg Vladimir Sementsov-Ogievskiy
` (16 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
In the next commit we'll get rid of source argument of cbw_init().
Prepare to it now, to make next commit simpler: move the code block
that uses source below attaching the child and use bs->file->bs instead
of source variable.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
block/copy-before-write.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/block/copy-before-write.c b/block/copy-before-write.c
index d7f1833efa..4858dcf8ff 100644
--- a/block/copy-before-write.c
+++ b/block/copy-before-write.c
@@ -149,13 +149,6 @@ static int cbw_init(BlockDriverState *bs, BlockDriverState *source,
{
BDRVCopyBeforeWriteState *s = bs->opaque;
- bs->total_sectors = source->total_sectors;
- bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED |
- (BDRV_REQ_FUA & source->supported_write_flags);
- bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED |
- ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) &
- source->supported_zero_flags);
-
bdrv_ref(target);
s->target = bdrv_attach_child(bs, target, "target", &child_of_bds,
BDRV_CHILD_DATA, errp);
@@ -173,6 +166,13 @@ static int cbw_init(BlockDriverState *bs, BlockDriverState *source,
return -EINVAL;
}
+ bs->total_sectors = bs->file->bs->total_sectors;
+ bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED |
+ (BDRV_REQ_FUA & bs->file->bs->supported_write_flags);
+ bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED |
+ ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) &
+ bs->file->bs->supported_zero_flags);
+
s->bcs = block_copy_state_new(bs->file, s->target, false, compress, errp);
if (!s->bcs) {
error_prepend(errp, "Cannot create block-copy-state: ");
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 19/35] block/copy-before-write: bdrv_cbw_append(): drop unused compress arg
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (17 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 18/35] block/copy-before-write: cbw_init(): use file child after attaching Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 20/35] block/copy-before-write: cbw_init(): use options Vladimir Sementsov-Ogievskiy
` (15 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/copy-before-write.h | 1 -
block/backup.c | 2 +-
block/copy-before-write.c | 7 +++----
3 files changed, 4 insertions(+), 6 deletions(-)
diff --git a/block/copy-before-write.h b/block/copy-before-write.h
index b386fd8f01..51847e711a 100644
--- a/block/copy-before-write.h
+++ b/block/copy-before-write.h
@@ -32,7 +32,6 @@
BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
BlockDriverState *target,
const char *filter_node_name,
- bool compress,
BlockCopyState **bcs,
Error **errp);
void bdrv_cbw_drop(BlockDriverState *bs);
diff --git a/block/backup.c b/block/backup.c
index 83516297cb..4869f1e5da 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -452,7 +452,7 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
goto error;
}
- cbw = bdrv_cbw_append(bs, target, filter_node_name, false, &bcs, errp);
+ cbw = bdrv_cbw_append(bs, target, filter_node_name, &bcs, errp);
if (!cbw) {
goto error;
}
diff --git a/block/copy-before-write.c b/block/copy-before-write.c
index 4858dcf8ff..1e7180760a 100644
--- a/block/copy-before-write.c
+++ b/block/copy-before-write.c
@@ -145,7 +145,7 @@ static void cbw_child_perm(BlockDriverState *bs, BdrvChild *c,
}
static int cbw_init(BlockDriverState *bs, BlockDriverState *source,
- BlockDriverState *target, bool compress, Error **errp)
+ BlockDriverState *target, Error **errp)
{
BDRVCopyBeforeWriteState *s = bs->opaque;
@@ -173,7 +173,7 @@ static int cbw_init(BlockDriverState *bs, BlockDriverState *source,
((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) &
bs->file->bs->supported_zero_flags);
- s->bcs = block_copy_state_new(bs->file, s->target, false, compress, errp);
+ s->bcs = block_copy_state_new(bs->file, s->target, false, false, errp);
if (!s->bcs) {
error_prepend(errp, "Cannot create block-copy-state: ");
return -EINVAL;
@@ -202,7 +202,6 @@ BlockDriver bdrv_cbw_filter = {
BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
BlockDriverState *target,
const char *filter_node_name,
- bool compress,
BlockCopyState **bcs,
Error **errp)
{
@@ -221,7 +220,7 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
}
state = top->opaque;
- ret = cbw_init(top, source, target, compress, errp);
+ ret = cbw_init(top, source, target, errp);
if (ret < 0) {
goto fail;
}
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 20/35] block/copy-before-write: cbw_init(): use options
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (18 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 19/35] block/copy-before-write: bdrv_cbw_append(): drop unused compress arg Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 21/35] block/copy-before-write: initialize block-copy bitmap Vladimir Sementsov-Ogievskiy
` (14 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
One more step closer to .bdrv_open(): use options instead of plain
arguments. Move to bdrv_open_child() calls, native for drive open
handlers.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/copy-before-write.c | 29 +++++++++++++++--------------
1 file changed, 15 insertions(+), 14 deletions(-)
diff --git a/block/copy-before-write.c b/block/copy-before-write.c
index 1e7180760a..1cefcade78 100644
--- a/block/copy-before-write.c
+++ b/block/copy-before-write.c
@@ -144,25 +144,20 @@ static void cbw_child_perm(BlockDriverState *bs, BdrvChild *c,
}
}
-static int cbw_init(BlockDriverState *bs, BlockDriverState *source,
- BlockDriverState *target, Error **errp)
+static int cbw_init(BlockDriverState *bs, QDict *options, Error **errp)
{
BDRVCopyBeforeWriteState *s = bs->opaque;
- bdrv_ref(target);
- s->target = bdrv_attach_child(bs, target, "target", &child_of_bds,
- BDRV_CHILD_DATA, errp);
- if (!s->target) {
- error_prepend(errp, "Cannot attach target child: ");
+ bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
+ BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
+ false, errp);
+ if (!bs->file) {
return -EINVAL;
}
- bdrv_ref(source);
- bs->file = bdrv_attach_child(bs, source, "file", &child_of_bds,
- BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
- errp);
- if (!bs->file) {
- error_prepend(errp, "Cannot attach file child: ");
+ s->target = bdrv_open_child(NULL, options, "target", bs, &child_of_bds,
+ BDRV_CHILD_DATA, false, errp);
+ if (!s->target) {
return -EINVAL;
}
@@ -209,6 +204,7 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
int ret;
BDRVCopyBeforeWriteState *state;
BlockDriverState *top;
+ QDict *opts;
assert(source->total_sectors == target->total_sectors);
@@ -220,7 +216,12 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
}
state = top->opaque;
- ret = cbw_init(top, source, target, errp);
+ opts = qdict_new();
+ qdict_put_str(opts, "file", bdrv_get_node_name(source));
+ qdict_put_str(opts, "target", bdrv_get_node_name(target));
+
+ ret = cbw_init(top, opts, errp);
+ qobject_unref(opts);
if (ret < 0) {
goto fail;
}
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 21/35] block/copy-before-write: initialize block-copy bitmap
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (19 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 20/35] block/copy-before-write: cbw_init(): use options Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 22/35] block/block-copy: make setting progress optional Vladimir Sementsov-Ogievskiy
` (13 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
We are going to publish copy-before-write filter to be used in separate
of backup. Future step would support bitmap for the filter. But let's
start from full set bitmap.
We have to modify backup, as bitmap is first initialized by
copy-before-write filter, and then backup modifies it.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
block/backup.c | 16 +++++++---------
block/copy-before-write.c | 4 ++++
2 files changed, 11 insertions(+), 9 deletions(-)
diff --git a/block/backup.c b/block/backup.c
index 4869f1e5da..687d2882bc 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -233,18 +233,16 @@ static void backup_init_bcs_bitmap(BackupBlockJob *job)
BdrvDirtyBitmap *bcs_bitmap = block_copy_dirty_bitmap(job->bcs);
if (job->sync_mode == MIRROR_SYNC_MODE_BITMAP) {
+ bdrv_clear_dirty_bitmap(bcs_bitmap, NULL);
ret = bdrv_dirty_bitmap_merge_internal(bcs_bitmap, job->sync_bitmap,
NULL, true);
assert(ret);
- } else {
- if (job->sync_mode == MIRROR_SYNC_MODE_TOP) {
- /*
- * We can't hog the coroutine to initialize this thoroughly.
- * Set a flag and resume work when we are able to yield safely.
- */
- block_copy_set_skip_unallocated(job->bcs, true);
- }
- bdrv_set_dirty_bitmap(bcs_bitmap, 0, job->len);
+ } else if (job->sync_mode == MIRROR_SYNC_MODE_TOP) {
+ /*
+ * We can't hog the coroutine to initialize this thoroughly.
+ * Set a flag and resume work when we are able to yield safely.
+ */
+ block_copy_set_skip_unallocated(job->bcs, true);
}
estimate = bdrv_get_dirty_count(bcs_bitmap);
diff --git a/block/copy-before-write.c b/block/copy-before-write.c
index 1cefcade78..2efe098aae 100644
--- a/block/copy-before-write.c
+++ b/block/copy-before-write.c
@@ -147,6 +147,7 @@ static void cbw_child_perm(BlockDriverState *bs, BdrvChild *c,
static int cbw_init(BlockDriverState *bs, QDict *options, Error **errp)
{
BDRVCopyBeforeWriteState *s = bs->opaque;
+ BdrvDirtyBitmap *copy_bitmap;
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
@@ -174,6 +175,9 @@ static int cbw_init(BlockDriverState *bs, QDict *options, Error **errp)
return -EINVAL;
}
+ copy_bitmap = block_copy_dirty_bitmap(s->bcs);
+ bdrv_set_dirty_bitmap(copy_bitmap, 0, bdrv_dirty_bitmap_size(copy_bitmap));
+
return 0;
}
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 22/35] block/block-copy: make setting progress optional
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (20 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 21/35] block/copy-before-write: initialize block-copy bitmap Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 23/35] block/copy-before-write: make public block driver Vladimir Sementsov-Ogievskiy
` (12 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
Now block-copy will crash if user don't set progress meter by
block_copy_set_progress_meter(). copy-before-write filter will be used
in separate of backup job, and it doesn't want any progress meter (for
now). So, allow not setting it.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
block/block-copy.c | 18 +++++++++++-------
1 file changed, 11 insertions(+), 7 deletions(-)
diff --git a/block/block-copy.c b/block/block-copy.c
index 774f5029bb..5ee0f48a94 100644
--- a/block/block-copy.c
+++ b/block/block-copy.c
@@ -544,7 +544,7 @@ static coroutine_fn int block_copy_task_entry(AioTask *task)
t->call_state->ret = ret;
t->call_state->error_is_read = error_is_read;
}
- } else {
+ } else if (t->s->progress) {
progress_work_done(t->s->progress, t->bytes);
}
co_put_to_shres(t->s->mem, t->bytes);
@@ -648,9 +648,11 @@ int64_t block_copy_reset_unallocated(BlockCopyState *s,
if (!ret) {
bdrv_reset_dirty_bitmap(s->copy_bitmap, offset, bytes);
- progress_set_remaining(s->progress,
- bdrv_get_dirty_count(s->copy_bitmap) +
- s->in_flight_bytes);
+ if (s->progress) {
+ progress_set_remaining(s->progress,
+ bdrv_get_dirty_count(s->copy_bitmap) +
+ s->in_flight_bytes);
+ }
}
*count = bytes;
@@ -710,9 +712,11 @@ block_copy_dirty_clusters(BlockCopyCallState *call_state)
}
if (s->skip_unallocated && !(ret & BDRV_BLOCK_ALLOCATED)) {
block_copy_task_end(task, 0);
- progress_set_remaining(s->progress,
- bdrv_get_dirty_count(s->copy_bitmap) +
- s->in_flight_bytes);
+ if (s->progress) {
+ progress_set_remaining(s->progress,
+ bdrv_get_dirty_count(s->copy_bitmap) +
+ s->in_flight_bytes);
+ }
trace_block_copy_skip_range(s, task->offset, task->bytes);
offset = task_end(task);
bytes = end - offset;
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 23/35] block/copy-before-write: make public block driver
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (21 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 22/35] block/block-copy: make setting progress optional Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 24/35] qapi: publish copy-before-write filter Vladimir Sementsov-Ogievskiy
` (11 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
Finally, copy-before-write gets own .bdrv_open and .bdrv_close
handlers, block_init() call and becomes available through bdrv_open().
To achieve this:
- cbw_init gets unused flags argument and becomes cbw_open
- block_copy_state_free() call moved to new cbw_close()
- in bdrv_cbw_append:
- options are completed with driver and node-name, and we can simply
use bdrv_insert_node() to do both open and drained replacing
- in bdrv_cbw_drop:
- cbw_close() is now responsible for freeing s->bcs, so don't do it
here
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
block/copy-before-write.c | 60 ++++++++++++++++++---------------------
1 file changed, 28 insertions(+), 32 deletions(-)
diff --git a/block/copy-before-write.c b/block/copy-before-write.c
index 2efe098aae..2cd68b480a 100644
--- a/block/copy-before-write.c
+++ b/block/copy-before-write.c
@@ -144,7 +144,8 @@ static void cbw_child_perm(BlockDriverState *bs, BdrvChild *c,
}
}
-static int cbw_init(BlockDriverState *bs, QDict *options, Error **errp)
+static int cbw_open(BlockDriverState *bs, QDict *options, int flags,
+ Error **errp)
{
BDRVCopyBeforeWriteState *s = bs->opaque;
BdrvDirtyBitmap *copy_bitmap;
@@ -181,10 +182,21 @@ static int cbw_init(BlockDriverState *bs, QDict *options, Error **errp)
return 0;
}
+static void cbw_close(BlockDriverState *bs)
+{
+ BDRVCopyBeforeWriteState *s = bs->opaque;
+
+ block_copy_state_free(s->bcs);
+ s->bcs = NULL;
+}
+
BlockDriver bdrv_cbw_filter = {
.format_name = "copy-before-write",
.instance_size = sizeof(BDRVCopyBeforeWriteState),
+ .bdrv_open = cbw_open,
+ .bdrv_close = cbw_close,
+
.bdrv_co_preadv = cbw_co_preadv,
.bdrv_co_pwritev = cbw_co_pwritev,
.bdrv_co_pwrite_zeroes = cbw_co_pwrite_zeroes,
@@ -205,56 +217,40 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
Error **errp)
{
ERRP_GUARD();
- int ret;
BDRVCopyBeforeWriteState *state;
BlockDriverState *top;
QDict *opts;
assert(source->total_sectors == target->total_sectors);
- top = bdrv_new_open_driver(&bdrv_cbw_filter, filter_node_name,
- BDRV_O_RDWR, errp);
- if (!top) {
- error_prepend(errp, "Cannot open driver: ");
- return NULL;
- }
- state = top->opaque;
-
opts = qdict_new();
+ qdict_put_str(opts, "driver", "copy-before-write");
+ if (filter_node_name) {
+ qdict_put_str(opts, "node-name", filter_node_name);
+ }
qdict_put_str(opts, "file", bdrv_get_node_name(source));
qdict_put_str(opts, "target", bdrv_get_node_name(target));
- ret = cbw_init(top, opts, errp);
- qobject_unref(opts);
- if (ret < 0) {
- goto fail;
- }
-
- bdrv_drained_begin(source);
- ret = bdrv_replace_node(source, top, errp);
- bdrv_drained_end(source);
- if (ret < 0) {
- error_prepend(errp, "Cannot append copy-before-write filter: ");
- goto fail;
+ top = bdrv_insert_node(source, opts, BDRV_O_RDWR, errp);
+ if (!top) {
+ return NULL;
}
+ state = top->opaque;
*bcs = state->bcs;
return top;
-
-fail:
- block_copy_state_free(state->bcs);
- bdrv_unref(top);
- return NULL;
}
void bdrv_cbw_drop(BlockDriverState *bs)
{
- BDRVCopyBeforeWriteState *s = bs->opaque;
-
bdrv_drop_filter(bs, &error_abort);
-
- block_copy_state_free(s->bcs);
-
bdrv_unref(bs);
}
+
+static void cbw_init(void)
+{
+ bdrv_register(&bdrv_cbw_filter);
+}
+
+block_init(cbw_init);
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 24/35] qapi: publish copy-before-write filter
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (22 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 23/35] block/copy-before-write: make public block driver Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:10 ` [PATCH v4 25/35] python/qemu/machine.py: refactor _qemu_args() Vladimir Sementsov-Ogievskiy
` (10 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
qapi/block-core.json | 30 ++++++++++++++++++++++++++----
1 file changed, 26 insertions(+), 4 deletions(-)
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 2ea294129e..6c1ce86235 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -2808,15 +2808,17 @@
# @blklogwrites: Since 3.0
# @blkreplay: Since 4.2
# @compress: Since 5.0
+# @copy-before-write: Since 6.1
#
# Since: 2.9
##
{ 'enum': 'BlockdevDriver',
'data': [ 'blkdebug', 'blklogwrites', 'blkreplay', 'blkverify', 'bochs',
- 'cloop', 'compress', 'copy-on-read', 'dmg', 'file', 'ftp', 'ftps',
- 'gluster', 'host_cdrom', 'host_device', 'http', 'https', 'iscsi',
- 'luks', 'nbd', 'nfs', 'null-aio', 'null-co', 'nvme', 'parallels',
- 'preallocate', 'qcow', 'qcow2', 'qed', 'quorum', 'raw', 'rbd',
+ 'cloop', 'compress', 'copy-before-write', 'copy-on-read', 'dmg',
+ 'file', 'ftp', 'ftps', 'gluster', 'host_cdrom', 'host_device',
+ 'http', 'https', 'iscsi', 'luks', 'nbd', 'nfs', 'null-aio',
+ 'null-co', 'nvme', 'parallels', 'preallocate', 'qcow', 'qcow2',
+ 'qed', 'quorum', 'raw', 'rbd',
{ 'name': 'replication', 'if': 'defined(CONFIG_REPLICATION)' },
'ssh', 'throttle', 'vdi', 'vhdx', 'vmdk', 'vpc', 'vvfat' ] }
@@ -3937,6 +3939,25 @@
'base': 'BlockdevOptionsGenericFormat',
'data': { '*bottom': 'str' } }
+##
+# @BlockdevOptionsCbw:
+#
+# Driver specific block device options for the copy-before-write driver,
+# which does so called copy-before-write operations: when data is
+# written to the filter, the filter firstly reads corresponding blocks
+# from its file child and copies them to @target child. After successful
+# copying the write request is propagated to file child. If copying
+# failed, the original write request is failed too and no data is written
+# to file child.
+#
+# @target: The target for copy-before-write operations.
+#
+# Since: 6.1
+##
+{ 'struct': 'BlockdevOptionsCbw',
+ 'base': 'BlockdevOptionsGenericFormat',
+ 'data': { 'target': 'BlockdevRef' } }
+
##
# @BlockdevOptions:
#
@@ -3989,6 +4010,7 @@
'bochs': 'BlockdevOptionsGenericFormat',
'cloop': 'BlockdevOptionsGenericFormat',
'compress': 'BlockdevOptionsGenericFormat',
+ 'copy-before-write':'BlockdevOptionsCbw',
'copy-on-read':'BlockdevOptionsCor',
'dmg': 'BlockdevOptionsGenericFormat',
'file': 'BlockdevOptionsFile',
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 25/35] python/qemu/machine.py: refactor _qemu_args()
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (23 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 24/35] qapi: publish copy-before-write filter Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 23:38 ` John Snow
2021-06-02 13:10 ` [PATCH v4 26/35] python/qemu/machine: QEMUMachine: improve qmp() method Vladimir Sementsov-Ogievskiy
` (9 subsequent siblings)
34 siblings, 1 reply; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
- use shorter construction
- don't create new dict if not needed
- drop extra unpacking key-val arguments
- drop extra default values
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
python/qemu/machine.py | 18 ++++++++----------
1 file changed, 8 insertions(+), 10 deletions(-)
diff --git a/python/qemu/machine.py b/python/qemu/machine.py
index 6e44bda337..ff35f2cd6c 100644
--- a/python/qemu/machine.py
+++ b/python/qemu/machine.py
@@ -541,14 +541,12 @@ def _qmp(self) -> qmp.QEMUMonitorProtocol:
return self._qmp_connection
@classmethod
- def _qmp_args(cls, _conv_keys: bool = True, **args: Any) -> Dict[str, Any]:
- qmp_args = dict()
- for key, value in args.items():
- if _conv_keys:
- qmp_args[key.replace('_', '-')] = value
- else:
- qmp_args[key] = value
- return qmp_args
+ def _qmp_args(cls, conv_keys: bool,
+ args: Dict[str, Any]) -> Dict[str, Any]:
+ if conv_keys:
+ return {k.replace('_', '-'): v for k, v in args.items()}
+ else:
+ return args
def qmp(self, cmd: str,
conv_keys: bool = True,
@@ -556,7 +554,7 @@ def qmp(self, cmd: str,
"""
Invoke a QMP command and return the response dict
"""
- qmp_args = self._qmp_args(conv_keys, **args)
+ qmp_args = self._qmp_args(conv_keys, args)
return self._qmp.cmd(cmd, args=qmp_args)
def command(self, cmd: str,
@@ -567,7 +565,7 @@ def command(self, cmd: str,
On success return the response dict.
On failure raise an exception.
"""
- qmp_args = self._qmp_args(conv_keys, **args)
+ qmp_args = self._qmp_args(conv_keys, args)
return self._qmp.command(cmd, **qmp_args)
def get_qmp_event(self, wait: bool = False) -> Optional[QMPMessage]:
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* Re: [PATCH v4 25/35] python/qemu/machine.py: refactor _qemu_args()
2021-06-02 13:10 ` [PATCH v4 25/35] python/qemu/machine.py: refactor _qemu_args() Vladimir Sementsov-Ogievskiy
@ 2021-06-02 23:38 ` John Snow
2021-06-03 13:26 ` Vladimir Sementsov-Ogievskiy
0 siblings, 1 reply; 39+ messages in thread
From: John Snow @ 2021-06-02 23:38 UTC (permalink / raw)
To: Vladimir Sementsov-Ogievskiy, qemu-block
Cc: kwolf, berrange, ehabkost, qemu-devel, armbru, crosa, pbonzini, mreitz
On 6/2/21 9:10 AM, Vladimir Sementsov-Ogievskiy wrote:
> - use shorter construction
> - don't create new dict if not needed
> - drop extra unpacking key-val arguments
> - drop extra default values
>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> Reviewed-by: Max Reitz <mreitz@redhat.com>
Sorry, I shuffled around the Python stuff and this doesn't apply
anymore. I have applied it myself for review, though.
(I don't anticipate any more major shake-ups from this point forward.
Thanks for your help on reviews for that series.)
> ---
> python/qemu/machine.py | 18 ++++++++----------
> 1 file changed, 8 insertions(+), 10 deletions(-)
>
> diff --git a/python/qemu/machine.py b/python/qemu/machine.py
> index 6e44bda337..ff35f2cd6c 100644
> --- a/python/qemu/machine.py
> +++ b/python/qemu/machine.py
> @@ -541,14 +541,12 @@ def _qmp(self) -> qmp.QEMUMonitorProtocol:
> return self._qmp_connection
>
> @classmethod
> - def _qmp_args(cls, _conv_keys: bool = True, **args: Any) -> Dict[str, Any]:
> - qmp_args = dict()
> - for key, value in args.items():
> - if _conv_keys:
> - qmp_args[key.replace('_', '-')] = value
> - else:
> - qmp_args[key] = value
> - return qmp_args
> + def _qmp_args(cls, conv_keys: bool,
> + args: Dict[str, Any]) -> Dict[str, Any]:
> + if conv_keys:
> + return {k.replace('_', '-'): v for k, v in args.items()}
> + else:
> + return args
qemu/machine/machine.py:558:8: R1705: Unnecessary "else" after "return"
(no-else-return)
Also, can you try using Dict[str, object] instead? This keeps stricter
type checking enabled for callers trying to utilize the return value. On
my review branch (based on master, not kwolf's staging branch) it passes
Python linting and iotests 297, so it should hopefully not be a hassle.
>
> def qmp(self, cmd: str,
> conv_keys: bool = True,
> @@ -556,7 +554,7 @@ def qmp(self, cmd: str,
> """
> Invoke a QMP command and return the response dict
> """
> - qmp_args = self._qmp_args(conv_keys, **args)
> + qmp_args = self._qmp_args(conv_keys, args)
> return self._qmp.cmd(cmd, args=qmp_args)
>
> def command(self, cmd: str,
> @@ -567,7 +565,7 @@ def command(self, cmd: str,
> On success return the response dict.
> On failure raise an exception.
> """
> - qmp_args = self._qmp_args(conv_keys, **args)
> + qmp_args = self._qmp_args(conv_keys, args)
> return self._qmp.command(cmd, **qmp_args)
>
> def get_qmp_event(self, wait: bool = False) -> Optional[QMPMessage]:
>
With those items addressed:
Reviewed-by: John Snow <jsnow@redhat.com>
^ permalink raw reply [flat|nested] 39+ messages in thread* Re: [PATCH v4 25/35] python/qemu/machine.py: refactor _qemu_args()
2021-06-02 23:38 ` John Snow
@ 2021-06-03 13:26 ` Vladimir Sementsov-Ogievskiy
0 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-03 13:26 UTC (permalink / raw)
To: John Snow, qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
mreitz, kwolf
03.06.2021 02:38, John Snow wrote:
> On 6/2/21 9:10 AM, Vladimir Sementsov-Ogievskiy wrote:
>> - use shorter construction
>> - don't create new dict if not needed
>> - drop extra unpacking key-val arguments
>> - drop extra default values
>>
>> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
>> Reviewed-by: Max Reitz <mreitz@redhat.com>
>
> Sorry, I shuffled around the Python stuff and this doesn't apply anymore. I have applied it myself for review, though.
Not a problem, respect and congratulations for final landing of your python series!
>
> (I don't anticipate any more major shake-ups from this point forward. Thanks for your help on reviews for that series.)
>
>> ---
>> python/qemu/machine.py | 18 ++++++++----------
>> 1 file changed, 8 insertions(+), 10 deletions(-)
>>
>> diff --git a/python/qemu/machine.py b/python/qemu/machine.py
>> index 6e44bda337..ff35f2cd6c 100644
>> --- a/python/qemu/machine.py
>> +++ b/python/qemu/machine.py
>> @@ -541,14 +541,12 @@ def _qmp(self) -> qmp.QEMUMonitorProtocol:
>> return self._qmp_connection
>> @classmethod
>> - def _qmp_args(cls, _conv_keys: bool = True, **args: Any) -> Dict[str, Any]:
>> - qmp_args = dict()
>> - for key, value in args.items():
>> - if _conv_keys:
>> - qmp_args[key.replace('_', '-')] = value
>> - else:
>> - qmp_args[key] = value
>> - return qmp_args
>> + def _qmp_args(cls, conv_keys: bool,
>> + args: Dict[str, Any]) -> Dict[str, Any]:
>> + if conv_keys:
>> + return {k.replace('_', '-'): v for k, v in args.items()}
>> + else:
>> + return args
>
> qemu/machine/machine.py:558:8: R1705: Unnecessary "else" after "return" (no-else-return)
>
> Also, can you try using Dict[str, object] instead? This keeps stricter type checking enabled for callers trying to utilize the return value. On my review branch (based on master, not kwolf's staging branch) it passes Python linting and iotests 297, so it should hopefully not be a hassle.
OK
>
>> def qmp(self, cmd: str,
>> conv_keys: bool = True,
>> @@ -556,7 +554,7 @@ def qmp(self, cmd: str,
>> """
>> Invoke a QMP command and return the response dict
>> """
>> - qmp_args = self._qmp_args(conv_keys, **args)
>> + qmp_args = self._qmp_args(conv_keys, args)
>> return self._qmp.cmd(cmd, args=qmp_args)
>> def command(self, cmd: str,
>> @@ -567,7 +565,7 @@ def command(self, cmd: str,
>> On success return the response dict.
>> On failure raise an exception.
>> """
>> - qmp_args = self._qmp_args(conv_keys, **args)
>> + qmp_args = self._qmp_args(conv_keys, args)
>> return self._qmp.command(cmd, **qmp_args)
>> def get_qmp_event(self, wait: bool = False) -> Optional[QMPMessage]:
>>
>
> With those items addressed:
>
> Reviewed-by: John Snow <jsnow@redhat.com>
>
Thanks!
--
Best regards,
Vladimir
^ permalink raw reply [flat|nested] 39+ messages in thread
* [PATCH v4 26/35] python/qemu/machine: QEMUMachine: improve qmp() method
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (24 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 25/35] python/qemu/machine.py: refactor _qemu_args() Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:10 ` Vladimir Sementsov-Ogievskiy
2021-06-02 23:43 ` John Snow
2021-06-02 13:11 ` [PATCH v4 27/35] iotests.py: VM: add own __enter__ method Vladimir Sementsov-Ogievskiy
` (8 subsequent siblings)
34 siblings, 1 reply; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:10 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
We often call qmp() with unpacking dict, like qmp('foo', **{...}).
mypy don't really like it, it thinks that passed unpacked dict is a
positional argument and complains that it type should be bool (because
second argument of qmp() is conv_keys: bool).
Allow passing dict directly, simplifying interface, and giving a way to
satisfy mypy.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
python/qemu/machine.py | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/python/qemu/machine.py b/python/qemu/machine.py
index ff35f2cd6c..7a14605040 100644
--- a/python/qemu/machine.py
+++ b/python/qemu/machine.py
@@ -549,11 +549,21 @@ def _qmp_args(cls, conv_keys: bool,
return args
def qmp(self, cmd: str,
- conv_keys: bool = True,
+ args_dict: Optional[Dict[str, Any]] = None,
+ conv_keys: Optional[bool] = None,
**args: Any) -> QMPMessage:
"""
Invoke a QMP command and return the response dict
"""
+ if args_dict is not None:
+ assert not args
+ assert conv_keys is None
+ args = args_dict
+ conv_keys = False
+
+ if conv_keys is None:
+ conv_keys = True
+
qmp_args = self._qmp_args(conv_keys, args)
return self._qmp.cmd(cmd, args=qmp_args)
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* Re: [PATCH v4 26/35] python/qemu/machine: QEMUMachine: improve qmp() method
2021-06-02 13:10 ` [PATCH v4 26/35] python/qemu/machine: QEMUMachine: improve qmp() method Vladimir Sementsov-Ogievskiy
@ 2021-06-02 23:43 ` John Snow
0 siblings, 0 replies; 39+ messages in thread
From: John Snow @ 2021-06-02 23:43 UTC (permalink / raw)
To: Vladimir Sementsov-Ogievskiy, qemu-block
Cc: kwolf, berrange, ehabkost, qemu-devel, armbru, crosa, pbonzini, mreitz
On 6/2/21 9:10 AM, Vladimir Sementsov-Ogievskiy wrote:
> We often call qmp() with unpacking dict, like qmp('foo', **{...}).
> mypy don't really like it, it thinks that passed unpacked dict is a
> positional argument and complains that it type should be bool (because
> second argument of qmp() is conv_keys: bool).
>
> Allow passing dict directly, simplifying interface, and giving a way to
> satisfy mypy.
>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> Reviewed-by: Max Reitz <mreitz@redhat.com>
> ---
> python/qemu/machine.py | 12 +++++++++++-
> 1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/python/qemu/machine.py b/python/qemu/machine.py
> index ff35f2cd6c..7a14605040 100644
> --- a/python/qemu/machine.py
> +++ b/python/qemu/machine.py
> @@ -549,11 +549,21 @@ def _qmp_args(cls, conv_keys: bool,
> return args
>
> def qmp(self, cmd: str,
> - conv_keys: bool = True,
> + args_dict: Optional[Dict[str, Any]] = None,
try using object here, too.
> + conv_keys: Optional[bool] = None,
> **args: Any) -> QMPMessage:
> """
> Invoke a QMP command and return the response dict
> """
> + if args_dict is not None:
> + assert not args
> + assert conv_keys is None
> + args = args_dict
> + conv_keys = False
> +
> + if conv_keys is None:
> + conv_keys = True
> +
> qmp_args = self._qmp_args(conv_keys, args)
> return self._qmp.cmd(cmd, args=qmp_args)
>
>
With the comment addressed:
Reviewed-by: John Snow <jsnow@redhat.com>
Thanks,
--js
^ permalink raw reply [flat|nested] 39+ messages in thread
* [PATCH v4 27/35] iotests.py: VM: add own __enter__ method
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (25 preceding siblings ...)
2021-06-02 13:10 ` [PATCH v4 26/35] python/qemu/machine: QEMUMachine: improve qmp() method Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:11 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:11 ` [PATCH v4 28/35] iotests/222: fix pylint and mypy complains Vladimir Sementsov-Ogievskiy
` (7 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:11 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
In superclass __enter__ method is defined with return value type hint
'QEMUMachine'. So, mypy thinks that return value of VM.__enter__ is
QEMUMachine. Let's redefine __enter__ in VM class, to give it correct
type hint.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
tests/qemu-iotests/iotests.py | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 777fa2ec0e..c7ec16c082 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -568,6 +568,10 @@ def remote_filename(path):
class VM(qtest.QEMUQtestMachine):
'''A QEMU VM'''
+ # Redefine __enter__ with proper type hint
+ def __enter__(self) -> 'VM':
+ return self
+
def __init__(self, path_suffix=''):
name = "qemu%s-%d" % (path_suffix, os.getpid())
super().__init__(qemu_prog, qemu_opts, name=name,
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 28/35] iotests/222: fix pylint and mypy complains
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (26 preceding siblings ...)
2021-06-02 13:11 ` [PATCH v4 27/35] iotests.py: VM: add own __enter__ method Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:11 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:11 ` [PATCH v4 29/35] iotests/222: constantly use single quotes for strings Vladimir Sementsov-Ogievskiy
` (6 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:11 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
Here:
- long line
- move to new interface of vm.qmp() (direct passing dict), to avoid
mypy false-positive, as it thinks that unpacked dict is a positional
argument.
- extra parenthesis
- handle event_wait possible None value
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
tests/qemu-iotests/222 | 20 +++++++++++---------
tests/qemu-iotests/297 | 2 +-
2 files changed, 12 insertions(+), 10 deletions(-)
diff --git a/tests/qemu-iotests/222 b/tests/qemu-iotests/222
index b48afe623e..5e2556f8df 100755
--- a/tests/qemu-iotests/222
+++ b/tests/qemu-iotests/222
@@ -50,7 +50,8 @@ remainder = [("0xd5", "0x108000", "32k"), # Right-end of partial-left [1]
with iotests.FilePath('base.img') as base_img_path, \
iotests.FilePath('fleece.img') as fleece_img_path, \
- iotests.FilePath('nbd.sock', base_dir=iotests.sock_dir) as nbd_sock_path, \
+ iotests.FilePath('nbd.sock',
+ base_dir=iotests.sock_dir) as nbd_sock_path, \
iotests.VM() as vm:
log('--- Setting up images ---')
@@ -81,7 +82,7 @@ with iotests.FilePath('base.img') as base_img_path, \
tgt_node = "fleeceNode"
# create tgt_node backed by src_node
- log(vm.qmp("blockdev-add", **{
+ log(vm.qmp("blockdev-add", {
"driver": "qcow2",
"node-name": tgt_node,
"file": {
@@ -103,8 +104,8 @@ with iotests.FilePath('base.img') as base_img_path, \
nbd_uri = 'nbd+unix:///%s?socket=%s' % (tgt_node, nbd_sock_path)
log(vm.qmp("nbd-server-start",
- **{"addr": { "type": "unix",
- "data": { "path": nbd_sock_path } } }))
+ {"addr": { "type": "unix",
+ "data": { "path": nbd_sock_path } } }))
log(vm.qmp("nbd-server-add", device=tgt_node))
@@ -112,7 +113,7 @@ with iotests.FilePath('base.img') as base_img_path, \
log('--- Sanity Check ---')
log('')
- for p in (patterns + zeroes):
+ for p in patterns + zeroes:
cmd = "read -P%s %s %s" % p
log(cmd)
assert qemu_io_silent('-r', '-f', 'raw', '-c', cmd, nbd_uri) == 0
@@ -130,7 +131,7 @@ with iotests.FilePath('base.img') as base_img_path, \
log('--- Verifying Data ---')
log('')
- for p in (patterns + zeroes):
+ for p in patterns + zeroes:
cmd = "read -P%s %s %s" % p
log(cmd)
assert qemu_io_silent('-r', '-f', 'raw', '-c', cmd, nbd_uri) == 0
@@ -140,8 +141,9 @@ with iotests.FilePath('base.img') as base_img_path, \
log('')
log(vm.qmp('block-job-cancel', device=src_node))
- log(vm.event_wait('BLOCK_JOB_CANCELLED'),
- filters=[iotests.filter_qmp_event])
+ e = vm.event_wait('BLOCK_JOB_CANCELLED')
+ assert e is not None
+ log(e, filters=[iotests.filter_qmp_event])
log(vm.qmp('nbd-server-stop'))
log(vm.qmp('blockdev-del', node_name=tgt_node))
vm.shutdown()
@@ -150,7 +152,7 @@ with iotests.FilePath('base.img') as base_img_path, \
log('--- Confirming writes ---')
log('')
- for p in (overwrite + remainder):
+ for p in overwrite + remainder:
cmd = "read -P%s %s %s" % p
log(cmd)
assert qemu_io_silent(base_img_path, '-c', cmd) == 0
diff --git a/tests/qemu-iotests/297 b/tests/qemu-iotests/297
index a37910b42d..7cb8c531fd 100755
--- a/tests/qemu-iotests/297
+++ b/tests/qemu-iotests/297
@@ -31,7 +31,7 @@ SKIP_FILES = (
'096', '118', '124', '132', '136', '139', '147', '148', '149',
'151', '152', '155', '163', '165', '169', '194', '196', '199', '202',
'203', '205', '206', '207', '208', '210', '211', '212', '213', '216',
- '218', '219', '222', '224', '228', '234', '235', '236', '237', '238',
+ '218', '219', '224', '228', '234', '235', '236', '237', '238',
'240', '242', '245', '246', '248', '255', '256', '257', '258', '260',
'262', '264', '266', '274', '277', '280', '281', '295', '296', '298',
'299', '302', '303', '304', '307',
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 29/35] iotests/222: constantly use single quotes for strings
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (27 preceding siblings ...)
2021-06-02 13:11 ` [PATCH v4 28/35] iotests/222: fix pylint and mypy complains Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:11 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:11 ` [PATCH v4 30/35] iotests: move 222 to tests/image-fleecing Vladimir Sementsov-Ogievskiy
` (5 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:11 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
The file use both single and double quotes for strings. Let's be
consistent.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
tests/qemu-iotests/222 | 68 +++++++++++++++++++++---------------------
1 file changed, 34 insertions(+), 34 deletions(-)
diff --git a/tests/qemu-iotests/222 b/tests/qemu-iotests/222
index 5e2556f8df..799369e290 100755
--- a/tests/qemu-iotests/222
+++ b/tests/qemu-iotests/222
@@ -30,23 +30,23 @@ iotests.script_initialize(
supported_platforms=['linux'],
)
-patterns = [("0x5d", "0", "64k"),
- ("0xd5", "1M", "64k"),
- ("0xdc", "32M", "64k"),
- ("0xcd", "0x3ff0000", "64k")] # 64M - 64K
+patterns = [('0x5d', '0', '64k'),
+ ('0xd5', '1M', '64k'),
+ ('0xdc', '32M', '64k'),
+ ('0xcd', '0x3ff0000', '64k')] # 64M - 64K
-overwrite = [("0xab", "0", "64k"), # Full overwrite
- ("0xad", "0x00f8000", "64k"), # Partial-left (1M-32K)
- ("0x1d", "0x2008000", "64k"), # Partial-right (32M+32K)
- ("0xea", "0x3fe0000", "64k")] # Adjacent-left (64M - 128K)
+overwrite = [('0xab', '0', '64k'), # Full overwrite
+ ('0xad', '0x00f8000', '64k'), # Partial-left (1M-32K)
+ ('0x1d', '0x2008000', '64k'), # Partial-right (32M+32K)
+ ('0xea', '0x3fe0000', '64k')] # Adjacent-left (64M - 128K)
-zeroes = [("0", "0x00f8000", "32k"), # Left-end of partial-left (1M-32K)
- ("0", "0x2010000", "32k"), # Right-end of partial-right (32M+64K)
- ("0", "0x3fe0000", "64k")] # overwrite[3]
+zeroes = [('0', '0x00f8000', '32k'), # Left-end of partial-left (1M-32K)
+ ('0', '0x2010000', '32k'), # Right-end of partial-right (32M+64K)
+ ('0', '0x3fe0000', '64k')] # overwrite[3]
-remainder = [("0xd5", "0x108000", "32k"), # Right-end of partial-left [1]
- ("0xdc", "32M", "32k"), # Left-end of partial-right [2]
- ("0xcd", "0x3ff0000", "64k")] # patterns[3]
+remainder = [('0xd5', '0x108000', '32k'), # Right-end of partial-left [1]
+ ('0xdc', '32M', '32k'), # Left-end of partial-right [2]
+ ('0xcd', '0x3ff0000', '64k')] # patterns[3]
with iotests.FilePath('base.img') as base_img_path, \
iotests.FilePath('fleece.img') as fleece_img_path, \
@@ -58,7 +58,7 @@ with iotests.FilePath('base.img') as base_img_path, \
log('')
assert qemu_img('create', '-f', iotests.imgfmt, base_img_path, '64M') == 0
- assert qemu_img('create', '-f', "qcow2", fleece_img_path, '64M') == 0
+ assert qemu_img('create', '-f', 'qcow2', fleece_img_path, '64M') == 0
for p in patterns:
qemu_io('-f', iotests.imgfmt,
@@ -78,43 +78,43 @@ with iotests.FilePath('base.img') as base_img_path, \
log('--- Setting up Fleecing Graph ---')
log('')
- src_node = "drive0"
- tgt_node = "fleeceNode"
+ src_node = 'drive0'
+ tgt_node = 'fleeceNode'
# create tgt_node backed by src_node
- log(vm.qmp("blockdev-add", {
- "driver": "qcow2",
- "node-name": tgt_node,
- "file": {
- "driver": "file",
- "filename": fleece_img_path,
+ log(vm.qmp('blockdev-add', {
+ 'driver': 'qcow2',
+ 'node-name': tgt_node,
+ 'file': {
+ 'driver': 'file',
+ 'filename': fleece_img_path,
},
- "backing": src_node,
+ 'backing': src_node,
}))
# Establish COW from source to fleecing node
- log(vm.qmp("blockdev-backup",
+ log(vm.qmp('blockdev-backup',
device=src_node,
target=tgt_node,
- sync="none"))
+ sync='none'))
log('')
log('--- Setting up NBD Export ---')
log('')
nbd_uri = 'nbd+unix:///%s?socket=%s' % (tgt_node, nbd_sock_path)
- log(vm.qmp("nbd-server-start",
- {"addr": { "type": "unix",
- "data": { "path": nbd_sock_path } } }))
+ log(vm.qmp('nbd-server-start',
+ {'addr': { 'type': 'unix',
+ 'data': { 'path': nbd_sock_path } } }))
- log(vm.qmp("nbd-server-add", device=tgt_node))
+ log(vm.qmp('nbd-server-add', device=tgt_node))
log('')
log('--- Sanity Check ---')
log('')
for p in patterns + zeroes:
- cmd = "read -P%s %s %s" % p
+ cmd = 'read -P%s %s %s' % p
log(cmd)
assert qemu_io_silent('-r', '-f', 'raw', '-c', cmd, nbd_uri) == 0
@@ -123,7 +123,7 @@ with iotests.FilePath('base.img') as base_img_path, \
log('')
for p in overwrite:
- cmd = "write -P%s %s %s" % p
+ cmd = 'write -P%s %s %s' % p
log(cmd)
log(vm.hmp_qemu_io(src_node, cmd))
@@ -132,7 +132,7 @@ with iotests.FilePath('base.img') as base_img_path, \
log('')
for p in patterns + zeroes:
- cmd = "read -P%s %s %s" % p
+ cmd = 'read -P%s %s %s' % p
log(cmd)
assert qemu_io_silent('-r', '-f', 'raw', '-c', cmd, nbd_uri) == 0
@@ -153,7 +153,7 @@ with iotests.FilePath('base.img') as base_img_path, \
log('')
for p in overwrite + remainder:
- cmd = "read -P%s %s %s" % p
+ cmd = 'read -P%s %s %s' % p
log(cmd)
assert qemu_io_silent(base_img_path, '-c', cmd) == 0
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 30/35] iotests: move 222 to tests/image-fleecing
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (28 preceding siblings ...)
2021-06-02 13:11 ` [PATCH v4 29/35] iotests/222: constantly use single quotes for strings Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:11 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:11 ` [PATCH v4 31/35] iotests.py: hmp_qemu_io: support qdev Vladimir Sementsov-Ogievskiy
` (4 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:11 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
Give a good name to test file.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
tests/qemu-iotests/{222 => tests/image-fleecing} | 0
tests/qemu-iotests/{222.out => tests/image-fleecing.out} | 0
2 files changed, 0 insertions(+), 0 deletions(-)
rename tests/qemu-iotests/{222 => tests/image-fleecing} (100%)
rename tests/qemu-iotests/{222.out => tests/image-fleecing.out} (100%)
diff --git a/tests/qemu-iotests/222 b/tests/qemu-iotests/tests/image-fleecing
similarity index 100%
rename from tests/qemu-iotests/222
rename to tests/qemu-iotests/tests/image-fleecing
diff --git a/tests/qemu-iotests/222.out b/tests/qemu-iotests/tests/image-fleecing.out
similarity index 100%
rename from tests/qemu-iotests/222.out
rename to tests/qemu-iotests/tests/image-fleecing.out
--
2.29.2
^ permalink raw reply [flat|nested] 39+ messages in thread* [PATCH v4 31/35] iotests.py: hmp_qemu_io: support qdev
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (29 preceding siblings ...)
2021-06-02 13:11 ` [PATCH v4 30/35] iotests: move 222 to tests/image-fleecing Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:11 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:11 ` [PATCH v4 32/35] iotests/image-fleecing: proper source device Vladimir Sementsov-Ogievskiy
` (3 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:11 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
tests/qemu-iotests/iotests.py | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index c7ec16c082..9fa0162b07 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -655,9 +655,10 @@ def resume_drive(self, drive: str) -> None:
self.hmp(f'qemu-io {drive} "remove_break bp_{drive}"')
def hmp_qemu_io(self, drive: str, cmd: str,
- use_log: bool = False) -> QMPMessage:
+ use_log: bool = False, qdev: bool = False) -> QMPMessage:
"""Write to a given drive using an HMP command"""
- return self.hmp(f'qemu-io {drive} "{cmd}"', use_log=use_log)
+ d = '-d ' if qdev else ''
+ return self.hmp(f'qemu-io {d}{drive} "{cmd}"', use_log=use_log)
def flatten_qmp_object(self, obj, output=None, basestr=''):
if output is None:
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 32/35] iotests/image-fleecing: proper source device
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (30 preceding siblings ...)
2021-06-02 13:11 ` [PATCH v4 31/35] iotests.py: hmp_qemu_io: support qdev Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:11 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:11 ` [PATCH v4 33/35] iotests/image-fleecing: rename tgt_node Vladimir Sementsov-Ogievskiy
` (2 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:11 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
Define scsi device to operate with it by qom-set in further patch.
Give a new node-name to source block node, to not look like device
name.
Job now don't want to work without giving explicit id, so, let's call
it "fleecing".
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
tests/qemu-iotests/tests/image-fleecing | 12 ++++++++----
tests/qemu-iotests/tests/image-fleecing.out | 2 +-
2 files changed, 9 insertions(+), 5 deletions(-)
diff --git a/tests/qemu-iotests/tests/image-fleecing b/tests/qemu-iotests/tests/image-fleecing
index 799369e290..961941bb27 100755
--- a/tests/qemu-iotests/tests/image-fleecing
+++ b/tests/qemu-iotests/tests/image-fleecing
@@ -70,7 +70,11 @@ with iotests.FilePath('base.img') as base_img_path, \
log('--- Launching VM ---')
log('')
- vm.add_drive(base_img_path)
+ src_node = 'source'
+ vm.add_blockdev(f'driver={iotests.imgfmt},file.driver=file,'
+ f'file.filename={base_img_path},node-name={src_node}')
+ vm.add_device('virtio-scsi')
+ vm.add_device(f'scsi-hd,id=sda,drive={src_node}')
vm.launch()
log('Done')
@@ -78,7 +82,6 @@ with iotests.FilePath('base.img') as base_img_path, \
log('--- Setting up Fleecing Graph ---')
log('')
- src_node = 'drive0'
tgt_node = 'fleeceNode'
# create tgt_node backed by src_node
@@ -94,6 +97,7 @@ with iotests.FilePath('base.img') as base_img_path, \
# Establish COW from source to fleecing node
log(vm.qmp('blockdev-backup',
+ job_id='fleecing',
device=src_node,
target=tgt_node,
sync='none'))
@@ -125,7 +129,7 @@ with iotests.FilePath('base.img') as base_img_path, \
for p in overwrite:
cmd = 'write -P%s %s %s' % p
log(cmd)
- log(vm.hmp_qemu_io(src_node, cmd))
+ log(vm.hmp_qemu_io('/machine/peripheral/sda', cmd, qdev=True))
log('')
log('--- Verifying Data ---')
@@ -140,7 +144,7 @@ with iotests.FilePath('base.img') as base_img_path, \
log('--- Cleanup ---')
log('')
- log(vm.qmp('block-job-cancel', device=src_node))
+ log(vm.qmp('block-job-cancel', device='fleecing'))
e = vm.event_wait('BLOCK_JOB_CANCELLED')
assert e is not None
log(e, filters=[iotests.filter_qmp_event])
diff --git a/tests/qemu-iotests/tests/image-fleecing.out b/tests/qemu-iotests/tests/image-fleecing.out
index 16643dde30..314a1b54e9 100644
--- a/tests/qemu-iotests/tests/image-fleecing.out
+++ b/tests/qemu-iotests/tests/image-fleecing.out
@@ -50,7 +50,7 @@ read -P0 0x3fe0000 64k
--- Cleanup ---
{"return": {}}
-{"data": {"device": "drive0", "len": 67108864, "offset": 393216, "speed": 0, "type": "backup"}, "event": "BLOCK_JOB_CANCELLED", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}
+{"data": {"device": "fleecing", "len": 67108864, "offset": 393216, "speed": 0, "type": "backup"}, "event": "BLOCK_JOB_CANCELLED", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}
{"return": {}}
{"return": {}}
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 33/35] iotests/image-fleecing: rename tgt_node
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (31 preceding siblings ...)
2021-06-02 13:11 ` [PATCH v4 32/35] iotests/image-fleecing: proper source device Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:11 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:11 ` [PATCH v4 34/35] iotests/image-fleecing: prepare for adding new test-case Vladimir Sementsov-Ogievskiy
2021-06-02 13:11 ` [PATCH v4 35/35] iotests/image-fleecing: add test-case for copy-before-write filter Vladimir Sementsov-Ogievskiy
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:11 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
Actually target of backup(sync=None) is not a final backup target:
image fleecing is intended to be used with external tool, which will
copy data from fleecing node to some real backup target.
Also, we are going to add a test case for "push backup with fleecing",
where instead of exporting fleecing node by NBD, we'll start a backup
job from fleecing node to real backup target.
To avoid confusion, let's rename temporary fleecing node now.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
tests/qemu-iotests/tests/image-fleecing | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/tests/qemu-iotests/tests/image-fleecing b/tests/qemu-iotests/tests/image-fleecing
index 961941bb27..ec4ef5f3f6 100755
--- a/tests/qemu-iotests/tests/image-fleecing
+++ b/tests/qemu-iotests/tests/image-fleecing
@@ -71,6 +71,7 @@ with iotests.FilePath('base.img') as base_img_path, \
log('')
src_node = 'source'
+ tmp_node = 'temp'
vm.add_blockdev(f'driver={iotests.imgfmt},file.driver=file,'
f'file.filename={base_img_path},node-name={src_node}')
vm.add_device('virtio-scsi')
@@ -82,12 +83,11 @@ with iotests.FilePath('base.img') as base_img_path, \
log('--- Setting up Fleecing Graph ---')
log('')
- tgt_node = 'fleeceNode'
- # create tgt_node backed by src_node
+ # create tmp_node backed by src_node
log(vm.qmp('blockdev-add', {
'driver': 'qcow2',
- 'node-name': tgt_node,
+ 'node-name': tmp_node,
'file': {
'driver': 'file',
'filename': fleece_img_path,
@@ -99,19 +99,19 @@ with iotests.FilePath('base.img') as base_img_path, \
log(vm.qmp('blockdev-backup',
job_id='fleecing',
device=src_node,
- target=tgt_node,
+ target=tmp_node,
sync='none'))
log('')
log('--- Setting up NBD Export ---')
log('')
- nbd_uri = 'nbd+unix:///%s?socket=%s' % (tgt_node, nbd_sock_path)
+ nbd_uri = 'nbd+unix:///%s?socket=%s' % (tmp_node, nbd_sock_path)
log(vm.qmp('nbd-server-start',
{'addr': { 'type': 'unix',
'data': { 'path': nbd_sock_path } } }))
- log(vm.qmp('nbd-server-add', device=tgt_node))
+ log(vm.qmp('nbd-server-add', device=tmp_node))
log('')
log('--- Sanity Check ---')
@@ -149,7 +149,7 @@ with iotests.FilePath('base.img') as base_img_path, \
assert e is not None
log(e, filters=[iotests.filter_qmp_event])
log(vm.qmp('nbd-server-stop'))
- log(vm.qmp('blockdev-del', node_name=tgt_node))
+ log(vm.qmp('blockdev-del', node_name=tmp_node))
vm.shutdown()
log('')
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 34/35] iotests/image-fleecing: prepare for adding new test-case
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (32 preceding siblings ...)
2021-06-02 13:11 ` [PATCH v4 33/35] iotests/image-fleecing: rename tgt_node Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:11 ` Vladimir Sementsov-Ogievskiy
2021-06-02 13:11 ` [PATCH v4 35/35] iotests/image-fleecing: add test-case for copy-before-write filter Vladimir Sementsov-Ogievskiy
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:11 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
We are going to add a test-case with some behavior modifications. So,
let's prepare a function to be reused.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
tests/qemu-iotests/tests/image-fleecing | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)
diff --git a/tests/qemu-iotests/tests/image-fleecing b/tests/qemu-iotests/tests/image-fleecing
index ec4ef5f3f6..e210c00d28 100755
--- a/tests/qemu-iotests/tests/image-fleecing
+++ b/tests/qemu-iotests/tests/image-fleecing
@@ -48,12 +48,7 @@ remainder = [('0xd5', '0x108000', '32k'), # Right-end of partial-left [1]
('0xdc', '32M', '32k'), # Left-end of partial-right [2]
('0xcd', '0x3ff0000', '64k')] # patterns[3]
-with iotests.FilePath('base.img') as base_img_path, \
- iotests.FilePath('fleece.img') as fleece_img_path, \
- iotests.FilePath('nbd.sock',
- base_dir=iotests.sock_dir) as nbd_sock_path, \
- iotests.VM() as vm:
-
+def do_test(base_img_path, fleece_img_path, nbd_sock_path, vm):
log('--- Setting up images ---')
log('')
@@ -163,3 +158,15 @@ with iotests.FilePath('base.img') as base_img_path, \
log('')
log('Done')
+
+
+def test():
+ with iotests.FilePath('base.img') as base_img_path, \
+ iotests.FilePath('fleece.img') as fleece_img_path, \
+ iotests.FilePath('nbd.sock',
+ base_dir=iotests.sock_dir) as nbd_sock_path, \
+ iotests.VM() as vm:
+ do_test(base_img_path, fleece_img_path, nbd_sock_path, vm)
+
+
+test()
--
2.29.2
^ permalink raw reply related [flat|nested] 39+ messages in thread* [PATCH v4 35/35] iotests/image-fleecing: add test-case for copy-before-write filter
2021-06-02 13:10 [PATCH v4 00/35] block: publish backup-top filter Vladimir Sementsov-Ogievskiy
` (33 preceding siblings ...)
2021-06-02 13:11 ` [PATCH v4 34/35] iotests/image-fleecing: prepare for adding new test-case Vladimir Sementsov-Ogievskiy
@ 2021-06-02 13:11 ` Vladimir Sementsov-Ogievskiy
34 siblings, 0 replies; 39+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2021-06-02 13:11 UTC (permalink / raw)
To: qemu-block
Cc: qemu-devel, eblake, armbru, crosa, ehabkost, berrange, pbonzini,
vsementsov, jsnow, mreitz, kwolf
New fleecing method becomes available: copy-before-write filter.
Actually we don't need backup job to setup image fleecing. Add test
for new recommended way of image fleecing.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
tests/qemu-iotests/tests/image-fleecing | 50 +++++++++-----
tests/qemu-iotests/tests/image-fleecing.out | 72 +++++++++++++++++++++
2 files changed, 107 insertions(+), 15 deletions(-)
diff --git a/tests/qemu-iotests/tests/image-fleecing b/tests/qemu-iotests/tests/image-fleecing
index e210c00d28..f6318492c6 100755
--- a/tests/qemu-iotests/tests/image-fleecing
+++ b/tests/qemu-iotests/tests/image-fleecing
@@ -48,7 +48,7 @@ remainder = [('0xd5', '0x108000', '32k'), # Right-end of partial-left [1]
('0xdc', '32M', '32k'), # Left-end of partial-right [2]
('0xcd', '0x3ff0000', '64k')] # patterns[3]
-def do_test(base_img_path, fleece_img_path, nbd_sock_path, vm):
+def do_test(use_cbw, base_img_path, fleece_img_path, nbd_sock_path, vm):
log('--- Setting up images ---')
log('')
@@ -67,6 +67,7 @@ def do_test(base_img_path, fleece_img_path, nbd_sock_path, vm):
src_node = 'source'
tmp_node = 'temp'
+ qom_path = '/machine/peripheral/sda'
vm.add_blockdev(f'driver={iotests.imgfmt},file.driver=file,'
f'file.filename={base_img_path},node-name={src_node}')
vm.add_device('virtio-scsi')
@@ -90,12 +91,22 @@ def do_test(base_img_path, fleece_img_path, nbd_sock_path, vm):
'backing': src_node,
}))
- # Establish COW from source to fleecing node
- log(vm.qmp('blockdev-backup',
- job_id='fleecing',
- device=src_node,
- target=tmp_node,
- sync='none'))
+ # Establish CBW from source to fleecing node
+ if use_cbw:
+ log(vm.qmp('blockdev-add', {
+ 'driver': 'copy-before-write',
+ 'node-name': 'fl-cbw',
+ 'file': src_node,
+ 'target': tmp_node
+ }))
+
+ log(vm.qmp('qom-set', path=qom_path, property='drive', value='fl-cbw'))
+ else:
+ log(vm.qmp('blockdev-backup',
+ job_id='fleecing',
+ device=src_node,
+ target=tmp_node,
+ sync='none'))
log('')
log('--- Setting up NBD Export ---')
@@ -124,7 +135,7 @@ def do_test(base_img_path, fleece_img_path, nbd_sock_path, vm):
for p in overwrite:
cmd = 'write -P%s %s %s' % p
log(cmd)
- log(vm.hmp_qemu_io('/machine/peripheral/sda', cmd, qdev=True))
+ log(vm.hmp_qemu_io(qom_path, cmd, qdev=True))
log('')
log('--- Verifying Data ---')
@@ -139,10 +150,15 @@ def do_test(base_img_path, fleece_img_path, nbd_sock_path, vm):
log('--- Cleanup ---')
log('')
- log(vm.qmp('block-job-cancel', device='fleecing'))
- e = vm.event_wait('BLOCK_JOB_CANCELLED')
- assert e is not None
- log(e, filters=[iotests.filter_qmp_event])
+ if use_cbw:
+ log(vm.qmp('qom-set', path=qom_path, property='drive', value=src_node))
+ log(vm.qmp('blockdev-del', node_name='fl-cbw'))
+ else:
+ log(vm.qmp('block-job-cancel', device='fleecing'))
+ e = vm.event_wait('BLOCK_JOB_CANCELLED')
+ assert e is not None
+ log(e, filters=[iotests.filter_qmp_event])
+
log(vm.qmp('nbd-server-stop'))
log(vm.qmp('blockdev-del', node_name=tmp_node))
vm.shutdown()
@@ -160,13 +176,17 @@ def do_test(base_img_path, fleece_img_path, nbd_sock_path, vm):
log('Done')
-def test():
+def test(use_cbw):
with iotests.FilePath('base.img') as base_img_path, \
iotests.FilePath('fleece.img') as fleece_img_path, \
iotests.FilePath('nbd.sock',
base_dir=iotests.sock_dir) as nbd_sock_path, \
iotests.VM() as vm:
- do_test(base_img_path, fleece_img_path, nbd_sock_path, vm)
+ do_test(use_cbw, base_img_path, fleece_img_path, nbd_sock_path, vm)
+
+log('=== Test backup(sync=none) based fleecing ===\n')
+test(False)
-test()
+log('=== Test filter based fleecing ===\n')
+test(True)
diff --git a/tests/qemu-iotests/tests/image-fleecing.out b/tests/qemu-iotests/tests/image-fleecing.out
index 314a1b54e9..e96d122a8b 100644
--- a/tests/qemu-iotests/tests/image-fleecing.out
+++ b/tests/qemu-iotests/tests/image-fleecing.out
@@ -1,3 +1,5 @@
+=== Test backup(sync=none) based fleecing ===
+
--- Setting up images ---
Done
@@ -65,3 +67,73 @@ read -P0xdc 32M 32k
read -P0xcd 0x3ff0000 64k
Done
+=== Test filter based fleecing ===
+
+--- Setting up images ---
+
+Done
+
+--- Launching VM ---
+
+Done
+
+--- Setting up Fleecing Graph ---
+
+{"return": {}}
+{"return": {}}
+{"return": {}}
+
+--- Setting up NBD Export ---
+
+{"return": {}}
+{"return": {}}
+
+--- Sanity Check ---
+
+read -P0x5d 0 64k
+read -P0xd5 1M 64k
+read -P0xdc 32M 64k
+read -P0xcd 0x3ff0000 64k
+read -P0 0x00f8000 32k
+read -P0 0x2010000 32k
+read -P0 0x3fe0000 64k
+
+--- Testing COW ---
+
+write -P0xab 0 64k
+{"return": ""}
+write -P0xad 0x00f8000 64k
+{"return": ""}
+write -P0x1d 0x2008000 64k
+{"return": ""}
+write -P0xea 0x3fe0000 64k
+{"return": ""}
+
+--- Verifying Data ---
+
+read -P0x5d 0 64k
+read -P0xd5 1M 64k
+read -P0xdc 32M 64k
+read -P0xcd 0x3ff0000 64k
+read -P0 0x00f8000 32k
+read -P0 0x2010000 32k
+read -P0 0x3fe0000 64k
+
+--- Cleanup ---
+
+{"return": {}}
+{"return": {}}
+{"return": {}}
+{"return": {}}
+
+--- Confirming writes ---
+
+read -P0xab 0 64k
+read -P0xad 0x00f8000 64k
+read -P0x1d 0x2008000 64k
+read -P0xea 0x3fe0000 64k
+read -P0xd5 0x108000 32k
+read -P0xdc 32M 32k
+read -P0xcd 0x3ff0000 64k
+
+Done
--
2.29.2
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