From: Fam Zheng <f...@redhat.com> This allows to put the dirty bitmap into a disabled state where no more writes will be tracked.
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> --- block.c | 24 +++++++++++++++++++++++- blockdev.c | 40 ++++++++++++++++++++++++++++++++++++++++ include/block/block.h | 3 +++ qapi/block-core.json | 28 ++++++++++++++++++++++++++++ qmp-commands.hx | 10 ++++++++++ 5 files changed, 104 insertions(+), 1 deletion(-) diff --git a/block.c b/block.c index 7bf7079..bd4b449 100644 --- a/block.c +++ b/block.c @@ -56,6 +56,7 @@ struct BdrvDirtyBitmap { int64_t size; int64_t granularity; char *name; + bool enabled; QLIST_ENTRY(BdrvDirtyBitmap) list; }; @@ -5373,10 +5374,16 @@ BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, bitmap->granularity = granularity; bitmap->bitmap = hbitmap_alloc(bitmap->size, ffs(sector_granularity) - 1); bitmap->name = g_strdup(name); + bitmap->enabled = true; QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list); return bitmap; } +bool bdrv_dirty_bitmap_enabled(BdrvDirtyBitmap *bitmap) +{ + return bitmap->enabled; +} + void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) { BdrvDirtyBitmap *bm, *next; @@ -5391,6 +5398,16 @@ void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) } } +void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap) +{ + bitmap->enabled = false; +} + +void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap) +{ + bitmap->enabled = true; +} + BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs) { BdrvDirtyBitmap *bm; @@ -5458,7 +5475,9 @@ void bdrv_dirty_iter_init(BlockDriverState *bs, void bdrv_set_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t cur_sector, int nr_sectors) { - hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); + if (bdrv_dirty_bitmap_enabled(bitmap)) { + hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); + } } void bdrv_reset_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, @@ -5481,6 +5500,9 @@ 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); } } diff --git a/blockdev.c b/blockdev.c index 95251c7..118cb6c 100644 --- a/blockdev.c +++ b/blockdev.c @@ -1994,6 +1994,46 @@ void qmp_block_dirty_bitmap_remove(const char *node_ref, const char *name, aio_context_release(aio_context); } +void qmp_block_dirty_bitmap_enable(const char *node_ref, const char *name, + Error **errp) +{ + AioContext *aio_context; + BdrvDirtyBitmap *bitmap; + BlockDriverState *bs; + + bitmap = block_dirty_bitmap_lookup(node_ref, 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_ref, const char *name, + Error **errp) +{ + AioContext *aio_context; + BdrvDirtyBitmap *bitmap; + BlockDriverState *bs; + + bitmap = block_dirty_bitmap_lookup(node_ref, 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 66f092a..a5bc249 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -437,10 +437,13 @@ 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); uint64_t bdrv_get_default_bitmap_granularity(BlockDriverState *bs); uint64_t bdrv_dirty_bitmap_granularity(BlockDriverState *bs, 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 f79d165..3e863b9 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -949,6 +949,34 @@ 'data': 'BlockDirtyBitmap' } ## +# @block-dirty-bitmap-enable +# +# Enable a dirty bitmap on the device +# +# Returns: nothing on success +# If @node-ref is not a valid block device, DeviceNotFound +# If @name is not found, GenericError with an explaining message +# +# 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-ref is not a valid block device, DeviceNotFound +# If @name is not found, GenericError with an explaining message +# +# 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 4ffca8a..59be8eb 100644 --- a/qmp-commands.hx +++ b/qmp-commands.hx @@ -1211,6 +1211,16 @@ EQMP .args_type = "node-ref:B,name:s", .mhandler.cmd_new = qmp_marshal_input_block_dirty_bitmap_remove, }, + { + .name = "block-dirty-bitmap-enable", + .args_type = "node-ref:B,name:s", + .mhandler.cmd_new = qmp_marshal_input_block_dirty_bitmap_enable, + }, + { + .name = "block-dirty-bitmap-disable", + .args_type = "node-ref:B,name:s", + .mhandler.cmd_new = qmp_marshal_input_block_dirty_bitmap_disable, + }, SQMP -- 1.9.3