FS-Cache: Annotate slow-work runqueue proc lines for FS-Cache work items

Annotate slow-work runqueue proc lines for FS-Cache work items.  Objects
include the object ID and the state.  Operations include the object ID, the
operation ID and the operation type and state.

Signed-off-by: David Howells <dhowells@redhat.com>

1 files changed, 40 insertions, 1 deletions

diff --git a/fs/fscache/object.c b/fs/fscache/object.c
index d236eb1d6f37..615b63dd9ecc 100644
--- a/fs/fscache/object.c
+++ b/fs/fscache/object.c
@@ -14,9 +14,10 @@
 
 #define FSCACHE_DEBUG_LEVEL COOKIE
 #include <linux/module.h>
+#include <linux/seq_file.h>
 #include "internal.h"
 
-const char *fscache_object_states[] = {
+const char *fscache_object_states[FSCACHE_OBJECT__NSTATES] = {
         [FSCACHE_OBJECT_INIT]           = "OBJECT_INIT",
         [FSCACHE_OBJECT_LOOKING_UP]     = "OBJECT_LOOKING_UP",
         [FSCACHE_OBJECT_CREATING]       = "OBJECT_CREATING",
@@ -33,9 +34,28 @@ const char *fscache_object_states[] = {
 };
 EXPORT_SYMBOL(fscache_object_states);
 
+static const char fscache_object_states_short[FSCACHE_OBJECT__NSTATES][5] = {
+        [FSCACHE_OBJECT_INIT]           = "INIT",
+        [FSCACHE_OBJECT_LOOKING_UP]     = "LOOK",
+        [FSCACHE_OBJECT_CREATING]       = "CRTN",
+        [FSCACHE_OBJECT_AVAILABLE]      = "AVBL",
+        [FSCACHE_OBJECT_ACTIVE]         = "ACTV",
+        [FSCACHE_OBJECT_UPDATING]       = "UPDT",
+        [FSCACHE_OBJECT_DYING]          = "DYNG",
+        [FSCACHE_OBJECT_LC_DYING]       = "LCDY",
+        [FSCACHE_OBJECT_ABORT_INIT]     = "ABTI",
+        [FSCACHE_OBJECT_RELEASING]      = "RELS",
+        [FSCACHE_OBJECT_RECYCLING]      = "RCYC",
+        [FSCACHE_OBJECT_WITHDRAWING]    = "WTHD",
+        [FSCACHE_OBJECT_DEAD]           = "DEAD",
+};
+
 static void fscache_object_slow_work_put_ref(struct slow_work *);
 static int  fscache_object_slow_work_get_ref(struct slow_work *);
 static void fscache_object_slow_work_execute(struct slow_work *);
+#ifdef CONFIG_SLOW_WORK_PROC
+static void fscache_object_slow_work_desc(struct slow_work *, struct seq_file *);
+#endif
 static void fscache_initialise_object(struct fscache_object *);
 static void fscache_lookup_object(struct fscache_object *);
 static void fscache_object_available(struct fscache_object *);
@@ -49,6 +69,9 @@ const struct slow_work_ops fscache_object_slow_work_ops = {
         .get_ref        = fscache_object_slow_work_get_ref,
         .put_ref        = fscache_object_slow_work_put_ref,
         .execute        = fscache_object_slow_work_execute,
+#ifdef CONFIG_SLOW_WORK_PROC
+        .desc           = fscache_object_slow_work_desc,
+#endif
 };
 EXPORT_SYMBOL(fscache_object_slow_work_ops);
 
@@ -327,6 +350,22 @@ static void fscache_object_slow_work_execute(struct slow_work *work)
 }
 
 /*
+ * describe an object for slow-work debugging
+ */
+#ifdef CONFIG_SLOW_WORK_PROC
+static void fscache_object_slow_work_desc(struct slow_work *work,
+                                          struct seq_file *m)
+{
+        struct fscache_object *object =
+                container_of(work, struct fscache_object, work);
+
+        seq_printf(m, "FSC: OBJ%x: %s",
+                   object->debug_id,
+                   fscache_object_states_short[object->state]);
+}
+#endif
+
+/*
  * initialise an object
  * - check the specified object's parent to see if we can make use of it
  *   immediately to do a creation