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> Reviewed-by: Max Reitz <mre...@redhat.com> --- block.c | 15 +++++++++++++ blockdev.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++ include/block/block.h | 2 ++ qapi/block-core.json | 28 +++++++++++++++++++++++ qmp-commands.hx | 10 +++++++++ 5 files changed, 116 insertions(+) diff --git a/block.c b/block.c index 2d08b9f..85215b3 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; }; @@ -5396,6 +5397,7 @@ 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; } @@ -5414,6 +5416,16 @@ 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; @@ -5482,6 +5494,9 @@ void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, { BdrvDirtyBitmap *bitmap; QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { + if (!bitmap->enabled) { + continue; + } hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); } } diff --git a/blockdev.c b/blockdev.c index 4d30b09..c6b0bf1 100644 --- a/blockdev.c +++ b/blockdev.c @@ -1173,6 +1173,41 @@ out_aio_context: return NULL; } +/** + * Return a dirty bitmap (if present), after validating + * the device and bitmap names. Returns NULL on error, + * including when the device and/or bitmap is not found. + */ +static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *device, + const char *name, + Error **errp) +{ + BlockDriverState *bs; + BdrvDirtyBitmap *bitmap; + + if (!device) { + error_setg(errp, "Device cannot be NULL"); + return NULL; + } + if (!name) { + error_setg(errp, "Bitmap name cannot be NULL"); + return NULL; + } + + bs = bdrv_lookup_bs(device, NULL, errp); + if (!bs) { + return NULL; + } + + bitmap = bdrv_find_dirty_bitmap(bs, name); + if (!bitmap) { + error_setg(errp, "Dirty bitmap not found: %s", name); + return NULL; + } + + return bitmap; +} + /* New and old BlockDriverState structs for atomic group operations */ typedef struct BlkTransactionState BlkTransactionState; @@ -1948,6 +1983,32 @@ void qmp_block_dirty_bitmap_remove(const char *device, const char *name, bdrv_release_dirty_bitmap(bs, bitmap); } +void qmp_block_dirty_bitmap_enable(const char *device, const char *name, + Error **errp) +{ + BdrvDirtyBitmap *bitmap; + + bitmap = block_dirty_bitmap_lookup(device, name, errp); + if (!bitmap) { + return; + } + + bdrv_enable_dirty_bitmap(bitmap); +} + +void qmp_block_dirty_bitmap_disable(const char *device, const char *name, + Error **errp) +{ + BdrvDirtyBitmap *bitmap; + + bitmap = block_dirty_bitmap_lookup(device, name, errp); + if (!bitmap) { + return; + } + + bdrv_disable_dirty_bitmap(bitmap); +} + 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 5522eba..b583457 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -442,6 +442,8 @@ BdrvDirtyBitmap *bdrv_copy_dirty_bitmap(BlockDriverState *bs, const BdrvDirtyBitmap *bitmap, const char *name); 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_dbm_calc_def_granularity(BlockDriverState *bs); int64_t bdrv_dirty_bitmap_granularity(BlockDriverState *bs, diff --git a/qapi/block-core.json b/qapi/block-core.json index da86e91..64b5755 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 @device 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 @device 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 03465a2..9a69633 100644 --- a/qmp-commands.hx +++ b/qmp-commands.hx @@ -1211,6 +1211,16 @@ EQMP .args_type = "device:B,name:s", .mhandler.cmd_new = qmp_marshal_input_block_dirty_bitmap_remove, }, + { + .name = "block-dirty-bitmap-enable", + .args_type = "device:B,name:s", + .mhandler.cmd_new = qmp_marshal_input_block_dirty_bitmap_enable, + }, + { + .name = "block-dirty-bitmap-disable", + .args_type = "device:B,name:s", + .mhandler.cmd_new = qmp_marshal_input_block_dirty_bitmap_disable, + }, SQMP -- 1.9.3