diff options
| -rw-r--r-- | block/qcow2-bitmap.c | 46 | ||||
| -rw-r--r-- | block/qcow2.c | 4 | ||||
| -rw-r--r-- | block/qcow2.h | 1 |
3 files changed, 48 insertions, 3 deletions
diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c index 92cef1c..e53a160 100644 --- a/block/qcow2-bitmap.c +++ b/block/qcow2-bitmap.c @@ -1175,6 +1175,52 @@ int qcow2_reopen_bitmaps_rw(BlockDriverState *bs, Error **errp) return qcow2_reopen_bitmaps_rw_hint(bs, NULL, errp); } +/* Checks to see if it's safe to resize bitmaps */ +int qcow2_truncate_bitmaps_check(BlockDriverState *bs, Error **errp) +{ + BDRVQcow2State *s = bs->opaque; + Qcow2BitmapList *bm_list; + Qcow2Bitmap *bm; + int ret = 0; + + if (s->nb_bitmaps == 0) { + return 0; + } + + bm_list = bitmap_list_load(bs, s->bitmap_directory_offset, + s->bitmap_directory_size, errp); + if (bm_list == NULL) { + return -EINVAL; + } + + QSIMPLEQ_FOREACH(bm, bm_list, entry) { + BdrvDirtyBitmap *bitmap = bdrv_find_dirty_bitmap(bs, bm->name); + if (bitmap == NULL) { + /* + * We rely on all bitmaps being in-memory to be able to resize them, + * Otherwise, we'd need to resize them on disk explicitly + */ + error_setg(errp, "Cannot resize qcow2 with persistent bitmaps that " + "were not loaded into memory"); + ret = -ENOTSUP; + goto out; + } + + /* + * The checks against readonly and busy are redundant, but certainly + * do no harm. checks against inconsistent are crucial: + */ + if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_DEFAULT, errp)) { + ret = -ENOTSUP; + goto out; + } + } + +out: + bitmap_list_free(bm_list); + return ret; +} + /* store_bitmap_data() * Store bitmap to image, filling bitmap table accordingly. */ diff --git a/block/qcow2.c b/block/qcow2.c index c4dd876..d48e2e5 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -3646,9 +3646,7 @@ static int coroutine_fn qcow2_co_truncate(BlockDriverState *bs, int64_t offset, } /* cannot proceed if image has bitmaps */ - if (s->nb_bitmaps) { - /* TODO: resize bitmaps in the image */ - error_setg(errp, "Can't resize an image which has bitmaps"); + if (qcow2_truncate_bitmaps_check(bs, errp)) { ret = -ENOTSUP; goto fail; } diff --git a/block/qcow2.h b/block/qcow2.h index de2a3bd..fdee297 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -723,6 +723,7 @@ Qcow2BitmapInfoList *qcow2_get_bitmap_info_list(BlockDriverState *bs, int qcow2_reopen_bitmaps_rw_hint(BlockDriverState *bs, bool *header_updated, Error **errp); int qcow2_reopen_bitmaps_rw(BlockDriverState *bs, Error **errp); +int qcow2_truncate_bitmaps_check(BlockDriverState *bs, Error **errp); void qcow2_store_persistent_dirty_bitmaps(BlockDriverState *bs, Error **errp); int qcow2_reopen_bitmaps_ro(BlockDriverState *bs, Error **errp); bool qcow2_can_store_new_dirty_bitmap(BlockDriverState *bs, |