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rbd: do not return -ERANGE on auth failures 

Trying to map an image out of a pool for which we don't have an 'x'
permission bit fails with -ERANGE from ceph_extract_encoded_string()
due to an unsigned vs signed bug.  Fix it and get rid of the -EINVAL
sink, thus propagating rbd::get_id cls method errors.  (I've seen
a bunch of unexplained -ERANGE reports, I bet this is it).

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
This commit is contained in:
Ilya Dryomov 2014-09-11 18:49:18 +04:00 committed by Ilya Dryomov
parent 91883cd27c
commit 7dd440c9e0
1 changed files with 1 additions and 3 deletions
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4
drivers/block/rbd.c
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@ -4924,7 +4924,7 @@ static int rbd_dev_image_id(struct rbd_device *rbd_dev)
ret = image_id ? 0 : -ENOMEM;
if (!ret)
rbd_dev->image_format = 1;
} else if (ret > sizeof (__le32)) {
} else if (ret >= 0) {
void *p = response;
image_id = ceph_extract_encoded_string(&p, p + ret,
@ -4932,8 +4932,6 @@ static int rbd_dev_image_id(struct rbd_device *rbd_dev)
ret = PTR_ERR_OR_ZERO(image_id);
if (!ret)
rbd_dev->image_format = 2;
} else {
ret = -EINVAL;
}
if (!ret) {