diff options
Diffstat (limited to 'block/io.c')
| -rw-r--r-- | block/io.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/block/io.c b/block/io.c index 8ff3b47fb4..6e2b59802e 100644 --- a/block/io.c +++ b/block/io.c @@ -3291,8 +3291,12 @@ static void bdrv_parent_cb_resize(BlockDriverState *bs) /** * Truncate file to 'offset' bytes (needed only for file protocols) + * + * If 'exact' is true, the file must be resized to exactly the given + * 'offset'. Otherwise, it is sufficient for the node to be at least + * 'offset' bytes in length. */ -int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset, +int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset, bool exact, PreallocMode prealloc, Error **errp) { BlockDriverState *bs = child->bs; @@ -3348,9 +3352,9 @@ int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset, } if (drv->bdrv_co_truncate) { - ret = drv->bdrv_co_truncate(bs, offset, prealloc, errp); + ret = drv->bdrv_co_truncate(bs, offset, exact, prealloc, errp); } else if (bs->file && drv->is_filter) { - ret = bdrv_co_truncate(bs->file, offset, prealloc, errp); + ret = bdrv_co_truncate(bs->file, offset, exact, prealloc, errp); } else { error_setg(errp, "Image format driver does not support resize"); ret = -ENOTSUP; @@ -3381,6 +3385,7 @@ out: typedef struct TruncateCo { BdrvChild *child; int64_t offset; + bool exact; PreallocMode prealloc; Error **errp; int ret; @@ -3389,18 +3394,19 @@ typedef struct TruncateCo { static void coroutine_fn bdrv_truncate_co_entry(void *opaque) { TruncateCo *tco = opaque; - tco->ret = bdrv_co_truncate(tco->child, tco->offset, tco->prealloc, - tco->errp); + tco->ret = bdrv_co_truncate(tco->child, tco->offset, tco->exact, + tco->prealloc, tco->errp); aio_wait_kick(); } -int bdrv_truncate(BdrvChild *child, int64_t offset, PreallocMode prealloc, - Error **errp) +int bdrv_truncate(BdrvChild *child, int64_t offset, bool exact, + PreallocMode prealloc, Error **errp) { Coroutine *co; TruncateCo tco = { .child = child, .offset = offset, + .exact = exact, .prealloc = prealloc, .errp = errp, .ret = NOT_DONE, |