Am 16.04.2020 um 11:50 hat Maxim Levitsky geschrieben:
> Currently if you attampt to create too large file with luks you
> get the following error message:
>
> Formatting 'test.luks', fmt=luks size=17592186044416 key-secret=sec0
> qemu-img: test.luks: Could not resize file: File too large
>
> While for raw format the error message is
> qemu-img: test.img: The image size is too large for file format 'raw'
>
>
> The reason for this is that qemu-img checks for errno of the failure,
> and presents the later error when it is -EFBIG
>
> However crypto generic code 'swallows' the errno and replaces it
> with -EIO.
>
> As an attempt to make it better, we can make luks driver,
> detect -EFBIG and in this case present a better error message,
> which is what this patch does
>
> The new error message is:
>
> qemu-img: error creating test.luks: The requested file size is too large
>
> Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1534898
> Signed-off-by: Maxim Levitsky <mlevi...@redhat.com>
> Reviewed-by: Daniel P. Berrangé <berra...@redhat.com>
> ---
> block/crypto.c | 23 ++++++++++++++++++++---
> 1 file changed, 20 insertions(+), 3 deletions(-)
>
> diff --git a/block/crypto.c b/block/crypto.c
> index d577f89659..1b604beb30 100644
> --- a/block/crypto.c
> +++ b/block/crypto.c
> @@ -104,18 +104,35 @@ static ssize_t block_crypto_init_func(QCryptoBlock
> *block,
> Error **errp)
> {
> struct BlockCryptoCreateData *data = opaque;
> + Error *local_error = NULL;
> + int ret;
>
> if (data->size > INT64_MAX || headerlen > INT64_MAX - data->size) {
> - error_setg(errp, "The requested file size is too large");
> - return -EFBIG;
> + ret = -EFBIG;
> + goto error;
> }
>
> /* User provided size should reflect amount of space made
> * available to the guest, so we must take account of that
> * which will be used by the crypto header
> */
> - return blk_truncate(data->blk, data->size + headerlen, false,
> + ret = blk_truncate(data->blk, data->size + headerlen, false,
> data->prealloc, errp);
I think you intended to use &local_error (which is by the way spelt
local_err in most other places) here instead of passing errp and never
assigning local_err at all.
Kevin
> +
> + if (ret >= 0) {
> + return ret;
> + }
> +
> +error:
> + if (ret == -EFBIG) {
> + /* Replace the error message with a better one */
> + error_free(local_error);
> + error_setg(errp, "The requested file size is too large");
> + } else {
> + error_propagate(errp, local_error);
> + }
> +
> + return ret;
> }
>
>
> --
> 2.17.2
>
