From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51903) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ebQlQ-0002nz-Cg for qemu-devel@nongnu.org; Tue, 16 Jan 2018 07:54:53 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ebQlP-0007C6-9e for qemu-devel@nongnu.org; Tue, 16 Jan 2018 07:54:52 -0500 Received: from mailhub.sw.ru ([195.214.232.25]:35061 helo=relay.sw.ru) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ebQlO-000799-Tl for qemu-devel@nongnu.org; Tue, 16 Jan 2018 07:54:51 -0500 From: Vladimir Sementsov-Ogievskiy Date: Tue, 16 Jan 2018 15:54:26 +0300 Message-Id: <20180116125427.18540-6-vsementsov@virtuozzo.com> In-Reply-To: <20180116125427.18540-1-vsementsov@virtuozzo.com> References: <20180116125427.18540-1-vsementsov@virtuozzo.com> Subject: [Qemu-devel] [PATCH v2 5/6] qapi: add block-dirty-bitmap-merge List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, qemu-block@nongnu.org Cc: eblake@redhat.com, armbru@redhat.com, mreitz@redhat.com, kwolf@redhat.com, jsnow@redhat.com, famz@redhat.com, vsementsov@virtuozzo.com, den@openvz.org, nshirokovskiy@virtuozzo.com, mnestratov@virtuozzo.com Signed-off-by: Vladimir Sementsov-Ogievskiy --- qapi/block-core.json | 38 ++++++++++++++++++++++++++++++++++++++ include/block/dirty-bitmap.h | 2 ++ block/dirty-bitmap.c | 18 ++++++++++++++++++ blockdev.c | 30 ++++++++++++++++++++++++++++++ 4 files changed, 88 insertions(+) diff --git a/qapi/block-core.json b/qapi/block-core.json index b3851ee760..9f9cfa0a44 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -1604,6 +1604,20 @@ '*persistent': 'bool', '*autoload': 'bool' } } ## +# @BlockDirtyBitmapMerge: +# +# @node: name of device/node which the bitmap is tracking +# +# @dst_name: name of the destination dirty bitmap +# +# @src_name: name of the source dirty bitmap +# +# Since: 2.12 +## +{ 'struct': 'BlockDirtyBitmapMerge', + 'data': { 'node': 'str', 'dst_name': 'str', 'src_name': 'str' } } + +## # @block-dirty-bitmap-add: # # Create a dirty bitmap with a name on the node, and start tracking the writes. @@ -1714,6 +1728,30 @@ 'data': 'BlockDirtyBitmap' } ## +# @block-dirty-bitmap-merge: +# +# Merge @src_name dirty bitmap to @dst_name dirty bitmap. @src_name dirty +# bitmap is unchanged. +# +# Returns: nothing on success +# If @node is not a valid block device, DeviceNotFound +# If @dst_name or @src_name is not found, GenericError +# If bitmaps has different sizes or granularities, GenericError +# +# Since: 2.12 +# +# Example: +# +# -> { "execute": "block-dirty-bitmap-merge", +# "arguments": { "node": "drive0", "dst_name": "bitmap0", +# "src_name": "bitmap1" } } +# <- { "return": {} } +# +## + { 'command': 'block-dirty-bitmap-merge', + 'data': 'BlockDirtyBitmapMerge' } + +## # @BlockDirtyBitmapSha256: # # SHA256 hash of dirty bitmap data diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h index 144e77a879..92a1041368 100644 --- a/include/block/dirty-bitmap.h +++ b/include/block/dirty-bitmap.h @@ -67,6 +67,8 @@ void bdrv_dirty_bitmap_deserialize_finish(BdrvDirtyBitmap *bitmap); void bdrv_dirty_bitmap_set_readonly(BdrvDirtyBitmap *bitmap, bool value); void bdrv_dirty_bitmap_set_persistance(BdrvDirtyBitmap *bitmap, bool persistent); +void bdrv_merge_dirty_bitmap(BdrvDirtyBitmap *dest, const BdrvDirtyBitmap *src, + Error **errp); /* Functions that require manual locking. */ void bdrv_dirty_bitmap_lock(BdrvDirtyBitmap *bitmap); diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c index d0a10c4f5d..afcb3f541e 100644 --- a/block/dirty-bitmap.c +++ b/block/dirty-bitmap.c @@ -699,3 +699,21 @@ char *bdrv_dirty_bitmap_sha256(const BdrvDirtyBitmap *bitmap, Error **errp) { return hbitmap_sha256(bitmap->bitmap, errp); } + +void bdrv_merge_dirty_bitmap(BdrvDirtyBitmap *dest, const BdrvDirtyBitmap *src, + Error **errp) +{ + /* only bitmaps from one bds are supported */ + assert(dest->mutex == src->mutex); + + qemu_mutex_lock(dest->mutex); + + assert(bdrv_dirty_bitmap_enabled(dest)); + assert(!bdrv_dirty_bitmap_readonly(dest)); + + if (!hbitmap_merge(dest->bitmap, src->bitmap)) { + error_setg(errp, "Bitmaps are incompatible and can't be merged"); + } + + qemu_mutex_unlock(dest->mutex); +} diff --git a/blockdev.c b/blockdev.c index d338363d78..1650c31c87 100644 --- a/blockdev.c +++ b/blockdev.c @@ -2942,6 +2942,36 @@ void qmp_block_dirty_bitmap_disable(const char *node, const char *name, bdrv_disable_dirty_bitmap(bitmap); } +void qmp_block_dirty_bitmap_merge(const char *node, const char *dst_name, + const char *src_name, Error **errp) +{ + BlockDriverState *bs; + BdrvDirtyBitmap *dst, *src; + + dst = block_dirty_bitmap_lookup(node, dst_name, &bs, errp); + if (!dst || !bs) { + return; + } + + if (bdrv_dirty_bitmap_frozen(dst)) { + error_setg(errp, "Bitmap '%s' is frozen and cannot be modified", + dst_name); + return; + } else if (bdrv_dirty_bitmap_readonly(dst)) { + error_setg(errp, "Bitmap '%s' is readonly and cannot be modified", + dst_name); + return; + } + + src = bdrv_find_dirty_bitmap(bs, src_name); + if (!src) { + error_setg(errp, "Dirty bitmap '%s' not found", src_name); + return; + } + + bdrv_merge_dirty_bitmap(dst, src, errp); +} + BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, const char *name, Error **errp) -- 2.11.1