diff options
| -rw-r--r-- | block.c | 23 | ||||
| -rw-r--r-- | include/block/block.h | 1 |
2 files changed, 24 insertions, 0 deletions
diff --git a/block.c b/block.c index f5eabaa032..c09a766f54 100644 --- a/block.c +++ b/block.c @@ -5065,6 +5065,29 @@ bool bdrv_is_sg(BlockDriverState *bs) return bs->sg; } +/** + * Return whether the given node supports compressed writes. + */ +bool bdrv_supports_compressed_writes(BlockDriverState *bs) +{ + BlockDriverState *filtered; + + if (!bs->drv || !block_driver_can_compress(bs->drv)) { + return false; + } + + filtered = bdrv_filter_bs(bs); + if (filtered) { + /* + * Filters can only forward compressed writes, so we have to + * check the child. + */ + return bdrv_supports_compressed_writes(filtered); + } + + return true; +} + const char *bdrv_get_format_name(BlockDriverState *bs) { return bs->drv ? bs->drv->format_name : NULL; diff --git a/include/block/block.h b/include/block/block.h index 2c09b93d07..981ab5b314 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -532,6 +532,7 @@ BlockDriverState *bdrv_next(BdrvNextIterator *it); void bdrv_next_cleanup(BdrvNextIterator *it); BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs); +bool bdrv_supports_compressed_writes(BlockDriverState *bs); void bdrv_iterate_format(void (*it)(void *opaque, const char *name), void *opaque, bool read_only); const char *bdrv_get_node_name(const BlockDriverState *bs); |