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, 22 insertions, 5 deletions

diff --git a/fs/fscache/page.c b/fs/fscache/page.c
index 2568e0eb644f..e8bbc395cef6 100644
--- a/fs/fscache/page.c
+++ b/fs/fscache/page.c
@@ -63,14 +63,19 @@ static void fscache_end_page_write(struct fscache_cookie *cookie, struct page *p
 static void fscache_attr_changed_op(struct fscache_operation *op)
 {
         struct fscache_object *object = op->object;
+        int ret;
 
         _enter("{OBJ%x OP%x}", object->debug_id, op->debug_id);
 
         fscache_stat(&fscache_n_attr_changed_calls);
 
-        if (fscache_object_is_active(object) &&
-            object->cache->ops->attr_changed(object) < 0)
-                fscache_abort_object(object);
+        if (fscache_object_is_active(object)) {
+                fscache_set_op_state(op, "CallFS");
+                ret = object->cache->ops->attr_changed(object);
+                fscache_set_op_state(op, "Done");
+                if (ret < 0)
+                        fscache_abort_object(object);
+        }
 
         _leave("");
 }
@@ -99,6 +104,7 @@ int __fscache_attr_changed(struct fscache_cookie *cookie)
         fscache_operation_init(op, NULL);
         fscache_operation_init_slow(op, fscache_attr_changed_op);
         op->flags = FSCACHE_OP_SLOW | (1 << FSCACHE_OP_EXCLUSIVE);
+        fscache_set_op_name(op, "Attr");
 
         spin_lock(&cookie->lock);
 
@@ -184,6 +190,7 @@ static struct fscache_retrieval *fscache_alloc_retrieval(
         op->start_time  = jiffies;
         INIT_WORK(&op->op.fast_work, fscache_retrieval_work);
         INIT_LIST_HEAD(&op->to_do);
+        fscache_set_op_name(&op->op, "Retr");
         return op;
 }
 
@@ -257,6 +264,7 @@ int __fscache_read_or_alloc_page(struct fscache_cookie *cookie,
                 _leave(" = -ENOMEM");
                 return -ENOMEM;
         }
+        fscache_set_op_name(&op->op, "RetrRA1");
 
         spin_lock(&cookie->lock);
 
@@ -369,6 +377,7 @@ int __fscache_read_or_alloc_pages(struct fscache_cookie *cookie,
         op = fscache_alloc_retrieval(mapping, end_io_func, context);
         if (!op)
                 return -ENOMEM;
+        fscache_set_op_name(&op->op, "RetrRAN");
 
         spin_lock(&cookie->lock);
 
@@ -461,6 +470,7 @@ int __fscache_alloc_page(struct fscache_cookie *cookie,
         op = fscache_alloc_retrieval(page->mapping, NULL, NULL);
         if (!op)
                 return -ENOMEM;
+        fscache_set_op_name(&op->op, "RetrAL1");
 
         spin_lock(&cookie->lock);
 
@@ -529,6 +539,8 @@ static void fscache_write_op(struct fscache_operation *_op)
 
         _enter("{OP%x,%d}", op->op.debug_id, atomic_read(&op->op.usage));
 
+        fscache_set_op_state(&op->op, "GetPage");
+
         spin_lock(&cookie->lock);
         spin_lock(&object->lock);
 
@@ -559,13 +571,17 @@ static void fscache_write_op(struct fscache_operation *_op)
         spin_unlock(&cookie->lock);
 
         if (page) {
+                fscache_set_op_state(&op->op, "Store");
                 ret = object->cache->ops->write_page(op, page);
+                fscache_set_op_state(&op->op, "EndWrite");
                 fscache_end_page_write(cookie, page);
                 page_cache_release(page);
-                if (ret < 0)
+                if (ret < 0) {
+                        fscache_set_op_state(&op->op, "Abort");
                         fscache_abort_object(object);
-                else
+                } else {
                         fscache_enqueue_operation(&op->op);
+                }
         }
 
         _leave("");
@@ -634,6 +650,7 @@ int __fscache_write_page(struct fscache_cookie *cookie,
         fscache_operation_init(&op->op, fscache_release_write_op);
         fscache_operation_init_slow(&op->op, fscache_write_op);
         op->op.flags = FSCACHE_OP_SLOW | (1 << FSCACHE_OP_WAITING);
+        fscache_set_op_name(&op->op, "Write1");
 
         ret = radix_tree_preload(gfp & ~__GFP_HIGHMEM);
         if (ret < 0)