[PATCH 01/12] tools/xenstore: manage per-transaction domain accounting data in an array

[Juergen Gross <jgross@xxxxxxxx>]

In order to prepare keeping accounting data in an array instead of
using independent fields, switch the struct changed_domain accounting
data to that scheme, for now only using an array with one element.

In order to be able to extend this scheme add the needed indexing enum
to xenstored_domain.h.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 tools/xenstore/xenstored_domain.c | 17 +++++++++--------
 tools/xenstore/xenstored_domain.h |  5 +++++
 2 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/tools/xenstore/xenstored_domain.c 
b/tools/xenstore/xenstored_domain.c
index 582b78b0ee..399fc920bb 100644
--- a/tools/xenstore/xenstored_domain.c
+++ b/tools/xenstore/xenstored_domain.c
@@ -99,8 +99,8 @@ struct changed_domain
        /* Identifier of the changed domain. */
        unsigned int domid;
 
-       /* Amount by which this domain's nbentry field has changed. */
-       int nbentry;
+       /* Accounting data. */
+       int acc[ACC_TR_N];
 };
 
 static struct hashtable *domhash;
@@ -558,7 +558,7 @@ int acc_fix_domains(struct list_head *head, bool update)
        int cnt;
 
        list_for_each_entry(cd, head, list) {
-               cnt = domain_nbentry_fix(cd->domid, cd->nbentry, update);
+               cnt = domain_nbentry_fix(cd->domid, cd->acc[ACC_NODES], update);
                if (!update) {
                        if (cnt >= quota_nb_entry_per_domain)
                                return ENOSPC;
@@ -603,8 +603,8 @@ static struct changed_domain *acc_get_changed_domain(const 
void *ctx,
        return cd;
 }
 
-static int acc_add_dom_nbentry(const void *ctx, struct list_head *head, int 
val,
-                              unsigned int domid)
+static int acc_add_changed_dom(const void *ctx, struct list_head *head,
+                              unsigned int what, int val, unsigned int domid)
 {
        struct changed_domain *cd;
 
@@ -613,9 +613,9 @@ static int acc_add_dom_nbentry(const void *ctx, struct 
list_head *head, int val,
                return 0;
 
        errno = 0;
-       cd->nbentry += val;
+       cd->acc[what] += val;
 
-       return cd->nbentry;
+       return cd->acc[what];
 }
 
 static void domain_conn_reset(struct domain *domain)
@@ -1076,7 +1076,8 @@ static int domain_nbentry_add(struct connection *conn, 
unsigned int domid,
 
        if (conn && conn->transaction) {
                head = transaction_get_changed_domains(conn->transaction);
-               ret = acc_add_dom_nbentry(conn->transaction, head, add, domid);
+               ret = acc_add_changed_dom(conn->transaction, head, ACC_NODES,
+                                         add, domid);
                if (errno) {
                        fail_transaction(conn->transaction);
                        return -1;
diff --git a/tools/xenstore/xenstored_domain.h 
b/tools/xenstore/xenstored_domain.h
index dc4660861e..124b9e1b1e 100644
--- a/tools/xenstore/xenstored_domain.h
+++ b/tools/xenstore/xenstored_domain.h
@@ -19,6 +19,11 @@
 #ifndef _XENSTORED_DOMAIN_H
 #define _XENSTORED_DOMAIN_H
 
+enum {
+       ACC_NODES,
+       ACC_TR_N        /* Number of elements per transaction and domain. */
+};
+
 void handle_event(void);
 
 void check_domains(void);
-- 
2.35.3