We had a lot of repetition of errors that would occur if we
ever register too many drivers; this is unlikely to occur
unless we start adding a lot of new hypervisor modules, but
if it does occur, it's better to have uniform handling of the
situation, so that a one-line change is all that would be
needed if we decide that an internal error is not the best.
* src/libvirt.c (virDriverCheckTabMaxReturn): New define.
(virRegister*Driver): Use it for less code duplication.
Signed-off-by: Eric Blake <eblake@xxxxxxxxxx>
---
v2: new patch, suggested by John Ferlan
src/libvirt.c | 77 ++++++++++++++++-------------------------------------------
1 file changed, 20 insertions(+), 57 deletions(-)
diff --git a/src/libvirt.c b/src/libvirt.c
index 2643f2d..b401f18 100644
--- a/src/libvirt.c
+++ b/src/libvirt.c
@@ -107,6 +107,16 @@
#define MAX_DRIVERS 20
+#define virDriverCheckTabMaxReturn(count, ret) \
+ do { \
+ if ((count) >= MAX_DRIVERS) { \
+ virReportError(VIR_ERR_INTERNAL_ERROR, \
+ _("Too many drivers, cannot register %s"), \
+ driver->name); \
+ return ret; \
+ } \
+ } while (0)
+
static virDriverPtr virDriverTab[MAX_DRIVERS];
static int virDriverTabCount = 0;
static virNetworkDriverPtr virNetworkDriverTab[MAX_DRIVERS];
@@ -542,13 +552,7 @@ int
virRegisterNetworkDriver(virNetworkDriverPtr driver)
{
virCheckNonNullArgReturn(driver, -1);
-
- if (virNetworkDriverTabCount >= MAX_DRIVERS) {
- virLibConnError(VIR_ERR_INTERNAL_ERROR,
- _("Too many drivers, cannot register %s"),
- driver->name);
- return -1;
- }
+ virDriverCheckTabMaxReturn(virNetworkDriverTabCount, -1);
VIR_DEBUG("registering %s as network driver %d",
driver->name, virNetworkDriverTabCount);
@@ -570,13 +574,7 @@ int
virRegisterInterfaceDriver(virInterfaceDriverPtr driver)
{
virCheckNonNullArgReturn(driver, -1);
-
- if (virInterfaceDriverTabCount >= MAX_DRIVERS) {
- virLibConnError(VIR_ERR_INTERNAL_ERROR,
- _("Too many drivers, cannot register %s"),
- driver->name);
- return -1;
- }
+ virDriverCheckTabMaxReturn(virInterfaceDriverTabCount, -1);
VIR_DEBUG("registering %s as interface driver %d",
driver->name, virInterfaceDriverTabCount);
@@ -598,13 +596,7 @@ int
virRegisterStorageDriver(virStorageDriverPtr driver)
{
virCheckNonNullArgReturn(driver, -1);
-
- if (virStorageDriverTabCount >= MAX_DRIVERS) {
- virLibConnError(VIR_ERR_INTERNAL_ERROR,
- _("Too many drivers, cannot register %s"),
- driver->name);
- return -1;
- }
+ virDriverCheckTabMaxReturn(virStorageDriverTabCount, -1);
VIR_DEBUG("registering %s as storage driver %d",
driver->name, virStorageDriverTabCount);
@@ -626,13 +618,7 @@ int
virRegisterNodeDeviceDriver(virNodeDeviceDriverPtr driver)
{
virCheckNonNullArgReturn(driver, -1);
-
- if (virNodeDeviceDriverTabCount >= MAX_DRIVERS) {
- virLibConnError(VIR_ERR_INTERNAL_ERROR,
- _("Too many drivers, cannot register %s"),
- driver->name);
- return -1;
- }
+ virDriverCheckTabMaxReturn(virNodeDeviceDriverTabCount, -1);
VIR_DEBUG("registering %s as device driver %d",
driver->name, virNodeDeviceDriverTabCount);
@@ -654,13 +640,7 @@ int
virRegisterSecretDriver(virSecretDriverPtr driver)
{
virCheckNonNullArgReturn(driver, -1);
-
- if (virSecretDriverTabCount >= MAX_DRIVERS) {
- virLibConnError(VIR_ERR_INTERNAL_ERROR,
- _("Too many drivers, cannot register %s"),
- driver->name);
- return -1;
- }
+ virDriverCheckTabMaxReturn(virSecretDriverTabCount, -1);
VIR_DEBUG("registering %s as secret driver %d",
driver->name, virSecretDriverTabCount);
@@ -682,13 +662,7 @@ int
virRegisterNWFilterDriver(virNWFilterDriverPtr driver)
{
virCheckNonNullArgReturn(driver, -1);
-
- if (virNWFilterDriverTabCount >= MAX_DRIVERS) {
- virLibConnError(VIR_ERR_INTERNAL_ERROR,
- _("Too many drivers, cannot register %s"),
- driver->name);
- return -1;
- }
+ virDriverCheckTabMaxReturn(virNWFilterDriverTabCount, -1);
VIR_DEBUG("registering %s as network filter driver %d",
driver->name, virNWFilterDriverTabCount);
@@ -709,16 +683,11 @@ virRegisterNWFilterDriver(virNWFilterDriverPtr driver)
int
virRegisterDriver(virDriverPtr driver)
{
- VIR_DEBUG("driver=%p name=%s", driver, driver ? NULLSTR(driver->name) : "(null)");
+ VIR_DEBUG("driver=%p name=%s", driver,
+ driver ? NULLSTR(driver->name) : "(null)");
virCheckNonNullArgReturn(driver, -1);
-
- if (virDriverTabCount >= MAX_DRIVERS) {
- virLibConnError(VIR_ERR_INTERNAL_ERROR,
- _("Too many drivers, cannot register %s"),
- driver->name);
- return -1;
- }
+ virDriverCheckTabMaxReturn(virDriverTabCount, -1);
VIR_DEBUG("registering %s as driver %d",
driver->name, virDriverTabCount);
@@ -741,13 +710,7 @@ int
virRegisterStateDriver(virStateDriverPtr driver)
{
virCheckNonNullArgReturn(driver, -1);
-
- if (virStateDriverTabCount >= MAX_DRIVERS) {
- virLibConnError(VIR_ERR_INTERNAL_ERROR,
- _("Too many drivers, cannot register %s"),
- driver->name);
- return -1;
- }
+ virDriverCheckTabMaxReturn(virStateDriverTabCount, -1);
virStateDriverTab[virStateDriverTabCount] = driver;
return virStateDriverTabCount++;
--
1.8.4.2
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