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[PATCH v2 1/1] block/crypto: better error message when creating too larg
From: |
Maxim Levitsky |
Subject: |
[PATCH v2 1/1] block/crypto: better error message when creating too large files |
Date: |
Mon, 20 Apr 2020 12:29:51 +0300 |
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 errono 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 <address@hidden>
Reviewed-by: Daniel P. Berrangé <address@hidden>
---
block/crypto.c | 25 +++++++++++++++++++++----
1 file changed, 21 insertions(+), 4 deletions(-)
diff --git a/block/crypto.c b/block/crypto.c
index d577f89659..f9f5dc11a7 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_err = 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,
- data->prealloc, errp);
+ ret = blk_truncate(data->blk, data->size + headerlen, false,
+ data->prealloc, &local_err);
+
+ if (ret >= 0) {
+ return ret;
+ }
+
+error:
+ if (ret == -EFBIG) {
+ /* Replace the error message with a better one */
+ error_free(local_err);
+ error_setg(errp, "The requested file size is too large");
+ } else {
+ error_propagate(errp, local_err);
+ }
+
+ return ret;
}
--
2.17.2