This allows to put the dirty bitmap into a disabled state where it is
read only. A disabled bitmap will ignore any attempts to set or reset
any of its bits, but can otherwise be renamed, deleted, or re-enabled.
It will be used before backup or writing to persistent file.
Signed-off-by: Fam Zheng <f...@redhat.com>
Signed-off-by: John Snow <js...@redhat.com>
Reviewed-by: Max Reitz <mre...@redhat.com>
---
block.c | 25 +++++++++++++++++++++++++
blockdev.c | 40 ++++++++++++++++++++++++++++++++++++++++
include/block/block.h | 3 +++
qapi/block-core.json | 28 ++++++++++++++++++++++++++++
qmp-commands.hx | 10 ++++++++++
5 files changed, 106 insertions(+)
diff --git a/block.c b/block.c
index 8b40e38..1fa2ed5 100644
--- a/block.c
+++ b/block.c
@@ -54,6 +54,7 @@
struct BdrvDirtyBitmap {
HBitmap *bitmap;
char *name;
+ bool disabled;
QLIST_ENTRY(BdrvDirtyBitmap) list;
};
@@ -5412,10 +5413,16 @@ BdrvDirtyBitmap
*bdrv_create_dirty_bitmap(BlockDriverState *bs,
bitmap = g_new0(BdrvDirtyBitmap, 1);
bitmap->bitmap = hbitmap_alloc(bitmap_size, ffs(sector_granularity) - 1);
bitmap->name = g_strdup(name);
+ bitmap->disabled = false;
QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list);
return bitmap;
}
+bool bdrv_dirty_bitmap_enabled(BdrvDirtyBitmap *bitmap)
+{
+ return !bitmap->disabled;
+}
+
void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap)
{
BdrvDirtyBitmap *bm, *next;
@@ -5430,6 +5437,16 @@ void bdrv_release_dirty_bitmap(BlockDriverState *bs,
BdrvDirtyBitmap *bitmap)
}
}
+void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap)
+{
+ bitmap->disabled = true;
+}
+
+void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap)
+{
+ bitmap->disabled = false;
+}
+
BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs)
{
BdrvDirtyBitmap *bm;
@@ -5494,12 +5511,14 @@ void bdrv_dirty_iter_init(BlockDriverState *bs,
void bdrv_set_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
int64_t cur_sector, int nr_sectors)
{
+ assert(bdrv_dirty_bitmap_enabled(bitmap));
hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors);
}
void bdrv_reset_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
int64_t cur_sector, int nr_sectors)
{
+ assert(bdrv_dirty_bitmap_enabled(bitmap));
hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors);
}
@@ -5508,6 +5527,9 @@ static void bdrv_set_dirty(BlockDriverState *bs, int64_t
cur_sector,
{
BdrvDirtyBitmap *bitmap;
QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) {
+ if (!bdrv_dirty_bitmap_enabled(bitmap)) {
+ continue;
+ }
hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors);
}
}
@@ -5517,6 +5539,9 @@ static void bdrv_reset_dirty(BlockDriverState *bs,
int64_t cur_sector,
{
BdrvDirtyBitmap *bitmap;
QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) {
+ if (!bdrv_dirty_bitmap_enabled(bitmap)) {
+ continue;
+ }
hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors);
}
}
diff --git a/blockdev.c b/blockdev.c
index 8842e39..d3599ac 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2053,6 +2053,46 @@ void qmp_block_dirty_bitmap_remove(const char *node,
const char *name,
aio_context_release(aio_context);
}
+void qmp_block_dirty_bitmap_enable(const char *node, const char *name,
+ Error **errp)
+{
+ AioContext *aio_context;
+ BdrvDirtyBitmap *bitmap;
+ BlockDriverState *bs;
+
+ bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
+ if (!bitmap) {
+ return;
+ }
+
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
+ bdrv_enable_dirty_bitmap(bitmap);
+
+ aio_context_release(aio_context);
+}
+
+void qmp_block_dirty_bitmap_disable(const char *node, const char *name,
+ Error **errp)
+{
+ AioContext *aio_context;
+ BdrvDirtyBitmap *bitmap;
+ BlockDriverState *bs;
+
+ bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
+ if (!bitmap) {
+ return;
+ }
+
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
+ bdrv_disable_dirty_bitmap(bitmap);
+
+ aio_context_release(aio_context);
+}
+
int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
const char *id = qdict_get_str(qdict, "id");
diff --git a/include/block/block.h b/include/block/block.h
index 41b8418..ae7e2ab 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -446,9 +446,12 @@ BdrvDirtyBitmap *bdrv_find_dirty_bitmap(BlockDriverState
*bs,
const char *name);
void bdrv_dirty_bitmap_make_anon(BlockDriverState *bs, BdrvDirtyBitmap
*bitmap);
void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
+void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap);
+void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap);
BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs);
uint32_t bdrv_get_default_bitmap_granularity(BlockDriverState *bs);
uint32_t bdrv_dirty_bitmap_granularity(BdrvDirtyBitmap *bitmap);
+bool bdrv_dirty_bitmap_enabled(BdrvDirtyBitmap *bitmap);
int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t
sector);
void bdrv_set_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
int64_t cur_sector, int nr_sectors);
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 764719d..a82f8fa 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -1014,6 +1014,34 @@
'data': 'BlockDirtyBitmap' }
##
+# @block-dirty-bitmap-enable
+#
+# Enable a dirty bitmap on the device
+#
+# Returns: nothing on success
+# If @node is not a valid block device, DeviceNotFound
+# If @name is not found, GenericError with an explanation
+#
+# Since 2.3
+##
+{ 'command': 'block-dirty-bitmap-enable',
+ 'data': 'BlockDirtyBitmap' }
+
+##
+# @block-dirty-bitmap-disable
+#
+# Disable a dirty bitmap on the device
+#
+# Returns: nothing on success
+# If @node is not a valid block device, DeviceNotFound
+# If @name is not found, GenericError with an explanation
+#
+# Since 2.3
+##
+{ 'command': 'block-dirty-bitmap-disable',
+ 'data': 'BlockDirtyBitmap' }
+
+##
# @block_set_io_throttle:
#
# Change I/O throttle limits for a block drive.
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 881a810..ce7782f 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -1253,6 +1253,16 @@ EQMP
.args_type = "node:B,name:s",
.mhandler.cmd_new = qmp_marshal_input_block_dirty_bitmap_remove,
},
+ {
+ .name = "block-dirty-bitmap-enable",
+ .args_type = "node:B,name:s",
+ .mhandler.cmd_new = qmp_marshal_input_block_dirty_bitmap_enable,
+ },
+ {
+ .name = "block-dirty-bitmap-disable",
+ .args_type = "node:B,name:s",
+ .mhandler.cmd_new = qmp_marshal_input_block_dirty_bitmap_disable,
+ },
SQMP
--
1.9.3
