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SubjectRe: [PATCH] ceph: fix mdsmap decode for v >= 17
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On 27/10/2022 23:28, Luís Henriques wrote:
> Commit d93231a6bc8a ("ceph: prevent a client from exceeding the MDS
> maximum xattr size") was merged before the corresponding MDS-side changes
> have been merged. With the introduction of 'bal_rank_mask' in the mdsmap,
> the decoding of maps with v>=17 is now incorrect. Fix this by skipping
> the 'bal_rank_mask' string decoding.
>
> Fixes: d93231a6bc8a ("ceph: prevent a client from exceeding the MDS maximum xattr size")
> Signed-off-by: Luís Henriques <lhenriques@suse.de>
> ---
> Hi!
>
> This inconsistency was introduced by ceph PR #43284; I think that, before
> picking this patch, we need to get PR #46357 merged to avoid new
> problems.
>
> Cheers,
> --
> Luís
>
> fs/ceph/mdsmap.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/fs/ceph/mdsmap.c b/fs/ceph/mdsmap.c
> index 3fbabc98e1f7..fe4f1a6c3465 100644
> --- a/fs/ceph/mdsmap.c
> +++ b/fs/ceph/mdsmap.c
> @@ -379,6 +379,8 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end, bool msgr2)
> ceph_decode_skip_8(p, end, bad_ext);
> /* required_client_features */
> ceph_decode_skip_set(p, end, 64, bad_ext);
> + /* bal_rank_mask */
> + ceph_decode_skip_string(p, end, bad_ext);
> ceph_decode_64_safe(p, end, m->m_max_xattr_size, bad_ext);
> } else {
> /* This forces the usage of the (sync) SETXATTR Op */
>
Luis,

Because the ceph PR #43284 will break kclient here and your xattr size
patch got merged long time ago, we should fix it in ceph. More detail
please see my comments in:

https://github.com/ceph/ceph/pull/46357#issuecomment-1294290492

Thanks!

- Xiubo



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