failslab: simplify debugfs initialization

Now cleanup_fault_attr_dentries() recursively removes a directory, So we
can simplify the error handling in the initialization code and no need
to hold dentry structs for each debugfs file.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 10 insertions, 21 deletions

diff --git a/mm/failslab.c b/mm/failslab.c
index 7df9f7f0abf1..1ce58c201dca 100644
--- a/mm/failslab.c
+++ b/mm/failslab.c
@@ -5,10 +5,6 @@ static struct {
         struct fault_attr attr;
         u32 ignore_gfp_wait;
         int cache_filter;
-#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
-        struct dentry *ignore_gfp_wait_file;
-        struct dentry *cache_filter_file;
-#endif
 } failslab = {
         .attr = FAULT_ATTR_INITIALIZER,
         .ignore_gfp_wait = 1,
@@ -39,31 +35,24 @@ __setup("failslab=", setup_failslab);
 static int __init failslab_debugfs_init(void)
 {
         mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
-        struct dentry *dir;
         int err;
 
         err = init_fault_attr_dentries(&failslab.attr, "failslab");
         if (err)
                 return err;
-        dir = failslab.attr.dir;
-
-        failslab.ignore_gfp_wait_file =
-                debugfs_create_bool("ignore-gfp-wait", mode, dir,
-                                      &failslab.ignore_gfp_wait);
 
-        failslab.cache_filter_file =
-                debugfs_create_bool("cache-filter", mode, dir,
-                                      &failslab.cache_filter);
+        if (!debugfs_create_bool("ignore-gfp-wait", mode, failslab.attr.dir,
+                                &failslab.ignore_gfp_wait))
+                goto fail;
+        if (!debugfs_create_bool("cache-filter", mode, failslab.attr.dir,
+                                &failslab.cache_filter))
+                goto fail;
 
-        if (!failslab.ignore_gfp_wait_file ||
-            !failslab.cache_filter_file) {
-                err = -ENOMEM;
-                debugfs_remove(failslab.cache_filter_file);
-                debugfs_remove(failslab.ignore_gfp_wait_file);
-                cleanup_fault_attr_dentries(&failslab.attr);
-        }
+        return 0;
+fail:
+        cleanup_fault_attr_dentries(&failslab.attr);
 
-        return err;
+        return -ENOMEM;
 }
 
 late_initcall(failslab_debugfs_init);