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Diffstat (limited to 'include/net/9p/client.h')
-rw-r--r--include/net/9p/client.h49
1 files changed, 45 insertions, 4 deletions
diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index ec1d1706f43c..78ebcf782ce5 100644
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -11,6 +11,7 @@
#include <linux/utsname.h>
#include <linux/idr.h>
+#include <linux/tracepoint-defs.h>
/* Number of requests per row */
#define P9_ROW_MAXTAG 255
@@ -76,7 +77,7 @@ enum p9_req_status_t {
struct p9_req_t {
int status;
int t_err;
- struct kref refcount;
+ refcount_t refcount;
wait_queue_head_t wq;
struct p9_fcall tc;
struct p9_fcall rc;
@@ -227,15 +228,55 @@ struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag);
static inline void p9_req_get(struct p9_req_t *r)
{
- kref_get(&r->refcount);
+ refcount_inc(&r->refcount);
}
static inline int p9_req_try_get(struct p9_req_t *r)
{
- return kref_get_unless_zero(&r->refcount);
+ return refcount_inc_not_zero(&r->refcount);
}
-int p9_req_put(struct p9_req_t *r);
+int p9_req_put(struct p9_client *c, struct p9_req_t *r);
+
+/* We cannot have the real tracepoints in header files,
+ * use a wrapper function */
+DECLARE_TRACEPOINT(9p_fid_ref);
+void do_trace_9p_fid_get(struct p9_fid *fid);
+void do_trace_9p_fid_put(struct p9_fid *fid);
+
+/* fid reference counting helpers:
+ * - fids used for any length of time should always be referenced through
+ * p9_fid_get(), and released with p9_fid_put()
+ * - v9fs_fid_lookup() or similar will automatically call get for you
+ * and also require a put
+ * - the *_fid_add() helpers will stash the fid in the inode,
+ * at which point it is the responsibility of evict_inode()
+ * to call the put
+ * - the last put will automatically send a clunk to the server
+ */
+static inline struct p9_fid *p9_fid_get(struct p9_fid *fid)
+{
+ if (tracepoint_enabled(9p_fid_ref))
+ do_trace_9p_fid_get(fid);
+
+ refcount_inc(&fid->count);
+
+ return fid;
+}
+
+static inline int p9_fid_put(struct p9_fid *fid)
+{
+ if (!fid || IS_ERR(fid))
+ return 0;
+
+ if (tracepoint_enabled(9p_fid_ref))
+ do_trace_9p_fid_put(fid);
+
+ if (!refcount_dec_and_test(&fid->count))
+ return 0;
+
+ return p9_client_clunk(fid);
+}
void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status);