xenbus_watch_path2 is not very general. Passing a printf-style format
string is no more complex and more general.
Signed-off-by: Jeremy Fitzhardinge <[email protected]>
Cc: Keir Fraser <[email protected]>
---
drivers/xen/xenbus/xenbus_client.c | 44 ++++++++++++++++++++----------------
drivers/xen/xenbus/xenbus_probe.c | 4 +--
include/xen/xenbus.h | 10 ++++----
3 files changed, 33 insertions(+), 25 deletions(-)
===================================================================
--- a/drivers/xen/xenbus/xenbus_client.c
+++ b/drivers/xen/xenbus/xenbus_client.c
@@ -92,14 +92,13 @@ EXPORT_SYMBOL_GPL(xenbus_watch_path);
/**
- * xenbus_watch_path2 - register a watch on path/path2
- * @dev: xenbus device
- * @path: first half of path to watch
- * @path2: second half of path to watch
+ * xenbus_watch_pathfmt - register a watch on a sprintf-formatted path
+ * @dev: xenbus device
* @watch: watch to register
* @callback: callback to register
- *
- * Register a watch on the given @path/@path2, using the given xenbus_watch
+ * @pathfmt: format of path to watch
+ *
+ * Register a watch on the given @path, using the given xenbus_watch
* structure for storage, and the given @callback function as the callback.
* Return 0 on success, or -errno on error. On success, the watched path
* (@path/@path2) will be saved as @watch->node, and becomes the caller's to
@@ -107,24 +106,31 @@ EXPORT_SYMBOL_GPL(xenbus_watch_path);
* free, the device will switch to %XenbusStateClosing, and the error will be
* saved in the store.
*/
-int xenbus_watch_path2(struct xenbus_device *dev, const char *path,
- const char *path2, struct xenbus_watch *watch,
- void (*callback)(struct xenbus_watch *,
- const char **, unsigned int))
-{
- int err;
- char *state = kasprintf(GFP_KERNEL, "%s/%s", path, path2);
- if (!state) {
+int xenbus_watch_pathfmt(struct xenbus_device *dev,
+ struct xenbus_watch *watch,
+ void (*callback)(struct xenbus_watch *,
+ const char **, unsigned int),
+ const char *pathfmt, ...)
+{
+ int err;
+ va_list ap;
+ char *path;
+
+ va_start(ap, pathfmt);
+ path = kvasprintf(GFP_KERNEL, pathfmt, ap);
+ va_end(ap);
+
+ if (!path) {
xenbus_dev_fatal(dev, -ENOMEM, "allocating path for watch");
return -ENOMEM;
}
- err = xenbus_watch_path(dev, state, watch, callback);
+ err = xenbus_watch_path(dev, path, watch, callback);
if (err)
- kfree(state);
- return err;
-}
-EXPORT_SYMBOL_GPL(xenbus_watch_path2);
+ kfree(path);
+ return err;
+}
+EXPORT_SYMBOL_GPL(xenbus_watch_pathfmt);
/**
===================================================================
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -227,8 +227,8 @@ static int talk_to_otherend(struct xenbu
static int watch_otherend(struct xenbus_device *dev)
{
- return xenbus_watch_path2(dev, dev->otherend, "state",
- &dev->otherend_watch, otherend_changed);
+ return xenbus_watch_pathfmt(dev, &dev->otherend_watch, otherend_changed,
+ "%s/%s", dev->otherend, "state");
}
===================================================================
--- a/include/xen/xenbus.h
+++ b/include/xen/xenbus.h
@@ -180,10 +180,12 @@ int xenbus_watch_path(struct xenbus_devi
struct xenbus_watch *watch,
void (*callback)(struct xenbus_watch *,
const char **, unsigned int));
-int xenbus_watch_path2(struct xenbus_device *dev, const char *path,
- const char *path2, struct xenbus_watch *watch,
- void (*callback)(struct xenbus_watch *,
- const char **, unsigned int));
+int xenbus_watch_pathfmt(struct xenbus_device *dev, struct xenbus_watch *watch,
+ void (*callback)(struct xenbus_watch *,
+ const char **, unsigned int),
+ const char *pathfmt, ...)
+ __attribute__ ((format (printf, 4, 5)));
+
int xenbus_switch_state(struct xenbus_device *dev, enum xenbus_state new_state);
int xenbus_grant_ring(struct xenbus_device *dev, unsigned long ring_mfn);
int xenbus_map_ring_valloc(struct xenbus_device *dev,
--
-
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