fault-injection: use debugfs_remove_recursive

Use debugfs_remove_recursive() to simplify initialization and
deinitialization of fault injection debugfs files.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/fault-inject.h

@@ -27,23 +27,7 @@ struct fault_attr {
 	unsigned long count;
 
 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
-
+	struct dentry *dir;
-	struct {
-		struct dentry *dir;
-
-		struct dentry *probability_file;
-		struct dentry *interval_file;
-		struct dentry *times_file;
-		struct dentry *space_file;
-		struct dentry *verbose_file;
-		struct dentry *task_filter_file;
-		struct dentry *stacktrace_depth_file;
-		struct dentry *require_start_file;
-		struct dentry *require_end_file;
-		struct dentry *reject_start_file;
-		struct dentry *reject_end_file;
-	} dentries;
-
 #endif
 };
 

lib/fault-inject.c

@@ -199,48 +199,7 @@ static struct dentry *debugfs_create_atomic_t(const char *name, mode_t mode,
 
 void cleanup_fault_attr_dentries(struct fault_attr *attr)
 {
-	debugfs_remove(attr->dentries.probability_file);
+	debugfs_remove_recursive(attr->dir);
-	attr->dentries.probability_file = NULL;
-
-	debugfs_remove(attr->dentries.interval_file);
-	attr->dentries.interval_file = NULL;
-
-	debugfs_remove(attr->dentries.times_file);
-	attr->dentries.times_file = NULL;
-
-	debugfs_remove(attr->dentries.space_file);
-	attr->dentries.space_file = NULL;
-
-	debugfs_remove(attr->dentries.verbose_file);
-	attr->dentries.verbose_file = NULL;
-
-	debugfs_remove(attr->dentries.task_filter_file);
-	attr->dentries.task_filter_file = NULL;
-
-#ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
-
-	debugfs_remove(attr->dentries.stacktrace_depth_file);
-	attr->dentries.stacktrace_depth_file = NULL;
-
-	debugfs_remove(attr->dentries.require_start_file);
-	attr->dentries.require_start_file = NULL;
-
-	debugfs_remove(attr->dentries.require_end_file);
-	attr->dentries.require_end_file = NULL;
-
-	debugfs_remove(attr->dentries.reject_start_file);
-	attr->dentries.reject_start_file = NULL;
-
-	debugfs_remove(attr->dentries.reject_end_file);
-	attr->dentries.reject_end_file = NULL;
-
-#endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
-
-	if (attr->dentries.dir)
-		WARN_ON(!simple_empty(attr->dentries.dir));
-
-	debugfs_remove(attr->dentries.dir);
-	attr->dentries.dir = NULL;
 }
 
 int init_fault_attr_dentries(struct fault_attr *attr, const char *name)
@@ -248,66 +207,46 @@ int init_fault_attr_dentries(struct fault_attr *attr, const char *name)
 	mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
 	struct dentry *dir;
 
-	memset(&attr->dentries, 0, sizeof(attr->dentries));
-
 	dir = debugfs_create_dir(name, NULL);
 	if (!dir)
+		return -ENOMEM;
+
+	attr->dir = dir;
+
+	if (!debugfs_create_ul("probability", mode, dir, &attr->probability))
 		goto fail;
-	attr->dentries.dir = dir;
+	if (!debugfs_create_ul("interval", mode, dir, &attr->interval))
-
+		goto fail;
-	attr->dentries.probability_file =
+	if (!debugfs_create_atomic_t("times", mode, dir, &attr->times))
-		debugfs_create_ul("probability", mode, dir, &attr->probability);
+		goto fail;
-
+	if (!debugfs_create_atomic_t("space", mode, dir, &attr->space))
-	attr->dentries.interval_file =
+		goto fail;
-		debugfs_create_ul("interval", mode, dir, &attr->interval);
+	if (!debugfs_create_ul("verbose", mode, dir, &attr->verbose))
-
+		goto fail;
-	attr->dentries.times_file =
+	if (!debugfs_create_bool("task-filter", mode, dir, &attr->task_filter))
-		debugfs_create_atomic_t("times", mode, dir, &attr->times);
-
-	attr->dentries.space_file =
-		debugfs_create_atomic_t("space", mode, dir, &attr->space);
-
-	attr->dentries.verbose_file =
-		debugfs_create_ul("verbose", mode, dir, &attr->verbose);
-
-	attr->dentries.task_filter_file = debugfs_create_bool("task-filter",
-						mode, dir, &attr->task_filter);
-
-	if (!attr->dentries.probability_file || !attr->dentries.interval_file ||
-	    !attr->dentries.times_file || !attr->dentries.space_file ||
-	    !attr->dentries.verbose_file || !attr->dentries.task_filter_file)
 		goto fail;
 
 #ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
 
-	attr->dentries.stacktrace_depth_file =
+	if (!debugfs_create_stacktrace_depth("stacktrace-depth", mode, dir,
-		debugfs_create_stacktrace_depth(
+				&attr->stacktrace_depth))
-			"stacktrace-depth", mode, dir, &attr->stacktrace_depth);
+		goto fail;
-
+	if (!debugfs_create_ul("require-start", mode, dir,
-	attr->dentries.require_start_file =
+				&attr->require_start))
-		debugfs_create_ul("require-start", mode, dir, &attr->require_start);
+		goto fail;
-
+	if (!debugfs_create_ul("require-end", mode, dir, &attr->require_end))
-	attr->dentries.require_end_file =
+		goto fail;
-		debugfs_create_ul("require-end", mode, dir, &attr->require_end);
+	if (!debugfs_create_ul("reject-start", mode, dir, &attr->reject_start))
-
+		goto fail;
-	attr->dentries.reject_start_file =
+	if (!debugfs_create_ul("reject-end", mode, dir, &attr->reject_end))
-		debugfs_create_ul("reject-start", mode, dir, &attr->reject_start);
-
-	attr->dentries.reject_end_file =
-		debugfs_create_ul("reject-end", mode, dir, &attr->reject_end);
-
-	if (!attr->dentries.stacktrace_depth_file ||
-	    !attr->dentries.require_start_file ||
-	    !attr->dentries.require_end_file ||
-	    !attr->dentries.reject_start_file ||
-	    !attr->dentries.reject_end_file)
 		goto fail;
 
 #endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
 
 	return 0;
 fail:
-	cleanup_fault_attr_dentries(attr);
+	debugfs_remove_recursive(attr->dir);
+
 	return -ENOMEM;
 }
 

mm/failslab.c

@@ -45,7 +45,7 @@ static int __init failslab_debugfs_init(void)
 	err = init_fault_attr_dentries(&failslab.attr, "failslab");
 	if (err)
 		return err;
-	dir = failslab.attr.dentries.dir;
+	dir = failslab.attr.dir;
 
 	failslab.ignore_gfp_wait_file =
 		debugfs_create_bool("ignore-gfp-wait", mode, dir,

mm/page_alloc.c

@@ -1424,7 +1424,7 @@ static int __init fail_page_alloc_debugfs(void)
 				       "fail_page_alloc");
 	if (err)
 		return err;
-	dir = fail_page_alloc.attr.dentries.dir;
+	dir = fail_page_alloc.attr.dir;
 
 	fail_page_alloc.ignore_gfp_wait_file =
 		debugfs_create_bool("ignore-gfp-wait", mode, dir,