diff options
| -rw-r--r-- | block.c | 5 | ||||
| -rw-r--r-- | block.h | 1 | ||||
| -rw-r--r-- | blockdev.c | 1 |
3 files changed, 7 insertions, 0 deletions
diff --git a/block.c b/block.c index 49e6cbcd52..452ae94eea 100644 --- a/block.c +++ b/block.c @@ -1811,6 +1811,11 @@ int bdrv_can_snapshot(BlockDriverState *bs) return 1; } +int bdrv_is_snapshot(BlockDriverState *bs) +{ + return !!(bs->open_flags & BDRV_O_SNAPSHOT); +} + BlockDriverState *bdrv_snapshots(void) { BlockDriverState *bs; diff --git a/block.h b/block.h index c2a7e4c762..db131a3438 100644 --- a/block.h +++ b/block.h @@ -202,6 +202,7 @@ const char *bdrv_get_encrypted_filename(BlockDriverState *bs); void bdrv_get_backing_filename(BlockDriverState *bs, char *filename, int filename_size); int bdrv_can_snapshot(BlockDriverState *bs); +int bdrv_is_snapshot(BlockDriverState *bs); BlockDriverState *bdrv_snapshots(void); int bdrv_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info); diff --git a/blockdev.c b/blockdev.c index 0a9dec364e..01e402bf3d 100644 --- a/blockdev.c +++ b/blockdev.c @@ -590,6 +590,7 @@ int do_change_block(Monitor *mon, const char *device, return -1; } bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; + bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) { qerror_report(QERR_OPEN_FILE_FAILED, filename); return -1; |