[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] oxenstored: Quota.merge: don't assume domain already exists
In Quota.merge, we merge two quota hashtables, orig_quota and mod_quota, putting the results into dest_quota. These hashtables map domids to the number of entries currently owned by that domain. When mod_quota contains an entry for a domid that was not present in orig_quota (or dest_quota), the call to get_entry caused Quota.merge to raise a Not_found exception. This propagates back to the client as an ENOENT error, which is not an appropriate return value from some operations, such as transaction_end. This situation can arise when a transaction that introduces a domain (hence calling Quota.add_entry) needs to be coalesced due to concurrent xenstore activity. This patch handles the merge in the case where mod_quota contains an entry not present in orig_quota (or in dest_quota) by treating that hashtable as having existing value 0. Signed-off-by: Jonathan Davies <jonathan.davies@xxxxxxxxxx> --- tools/ocaml/xenstored/quota.ml | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/ocaml/xenstored/quota.ml b/tools/ocaml/xenstored/quota.ml index e6953c6..abcac91 100644 --- a/tools/ocaml/xenstored/quota.ml +++ b/tools/ocaml/xenstored/quota.ml @@ -83,6 +83,6 @@ let add quota diff = Hashtbl.iter (fun id nb -> set_entry quota id (get_entry quota id + nb)) diff.cur let merge orig_quota mod_quota dest_quota = - Hashtbl.iter (fun id nb -> let diff = nb - (get_entry orig_quota id) in + Hashtbl.iter (fun id nb -> let diff = nb - (try get_entry orig_quota id with Not_found -> 0) in if diff <> 0 then - set_entry dest_quota id ((get_entry dest_quota id) + diff)) mod_quota.cur + set_entry dest_quota id ((try get_entry dest_quota id with Not_found -> 0) + diff)) mod_quota.cur -- 1.9.1 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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