[Xen-changelog] [xen stable-4.4] oxenstored: exempt dom0 from domU node quotas

[patchbot@xxxxxxx]

commit e6b2014af5f251f41401218299883de9cb60d0cd
Author:     Vincent Bernardoff <vincent.bernardoff@xxxxxxxxxx>
AuthorDate: Fri Mar 24 16:57:02 2017 +0000
Commit:     Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CommitDate: Wed Apr 5 15:26:37 2017 +0100

    oxenstored: exempt dom0 from domU node quotas
    
    If a domU has exhausted its quota we still want the toolstack in dom0 to
    be able to create new nodes in places like
      /local/domain/%d/control/shutdown
    
    Without this patch, a domU which has exhausted its quota can only be
    powered off, which is not as good as being able to request a clean
    shutdown.
    
    Reported-by: Juergen Gross <jgross@xxxxxxxx>
    Signed-off-by: Thomas Sanders <thomas.sanders@xxxxxxxxxx>
    Signed-off-by: Euan Harris <euan.harris@xxxxxxxxxx>
    Acked-by: David Scott <dave.scott@xxxxxxxxxx>
---
 tools/ocaml/xenstored/store.ml | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/ocaml/xenstored/store.ml b/tools/ocaml/xenstored/store.ml
index cac0b44..3efe515 100644
--- a/tools/ocaml/xenstored/store.ml
+++ b/tools/ocaml/xenstored/store.ml
@@ -383,7 +383,7 @@ let set_node store path node =
 let write store perm path value =
        let node, existing = get_deepest_existing_node store path in
        let owner = Node.get_owner node in
-       if existing then
+       if existing || (Perms.Connection.is_dom0 perm) then
                (* Only check the string length limit *)
                Quota.check store.quota (-1) (String.length value)
        else
@@ -398,7 +398,7 @@ let mkdir store perm path =
        let node, existing = get_deepest_existing_node store path in
        let owner = Node.get_owner node in
        (* It's upt to the mkdir logic to decide what to do with existing path 
*)
-       if not existing then Quota.check store.quota owner 0;
+       if not (existing || (Perms.Connection.is_dom0 perm)) then Quota.check 
store.quota owner 0;
        store.root <- path_mkdir store perm path;
        Quota.add_entry store.quota owner
 
@@ -416,7 +416,7 @@ let setperms store perm path nperms =
        | Some node ->
                let old_owner = Node.get_owner node in
                let new_owner = Perms.Node.get_owner nperms in
-               if old_owner <> new_owner then Quota.check store.quota 
new_owner 0;
+               if not ((old_owner = new_owner) || (Perms.Connection.is_dom0 
perm)) then Quota.check store.quota new_owner 0;
                store.root <- path_setperms store perm path nperms;
                Quota.del_entry store.quota old_owner;
                Quota.add_entry store.quota new_owner
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.4

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