Merge tag 'v3.10.76' into update

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / debugfs / inode.c

diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 4888cb3fdef76037b7af5f9db898bdcb82ce48c2..121d2b6d1fbc7369acbf2eb3a975d037ec38040f 100644 (file)
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -28,7 +28,7 @@
 #include <linux/magic.h>
 #include <linux/slab.h>
 
-#define DEBUGFS_DEFAULT_MODE   0700
+#define DEBUGFS_DEFAULT_MODE   0755
 
 static struct vfsmount *debugfs_mount;
 static int debugfs_mount_count;
@@ -245,10 +245,19 @@ static int debugfs_show_options(struct seq_file *m, struct dentry *root)
        return 0;
 }
 
+static void debugfs_evict_inode(struct inode *inode)
+{
+       truncate_inode_pages(&inode->i_data, 0);
+       clear_inode(inode);
+       if (S_ISLNK(inode->i_mode))
+               kfree(inode->i_private);
+}
+
 static const struct super_operations debugfs_super_operations = {
        .statfs         = simple_statfs,
        .remount_fs     = debugfs_remount,
        .show_options   = debugfs_show_options,
+       .evict_inode    = debugfs_evict_inode,
 };
 
 static int debug_fill_super(struct super_block *sb, void *data, int silent)
@@ -465,23 +474,14 @@ static int __debugfs_remove(struct dentry *dentry, struct dentry *parent)
        int ret = 0;
 
        if (debugfs_positive(dentry)) {
-               if (dentry->d_inode) {
-                       dget(dentry);
-                       switch (dentry->d_inode->i_mode & S_IFMT) {
-                       case S_IFDIR:
-                               ret = simple_rmdir(parent->d_inode, dentry);
-                               break;
-                       case S_IFLNK:
-                               kfree(dentry->d_inode->i_private);
-                               /* fall through */
-                       default:
-                               simple_unlink(parent->d_inode, dentry);
-                               break;
-                       }
-                       if (!ret)
-                               d_delete(dentry);
-                       dput(dentry);
-               }
+               dget(dentry);
+               if (S_ISDIR(dentry->d_inode->i_mode))
+                       ret = simple_rmdir(parent->d_inode, dentry);
+               else
+                       simple_unlink(parent->d_inode, dentry);
+               if (!ret)
+                       d_delete(dentry);
+               dput(dentry);
        }
        return ret;
 }
@@ -533,8 +533,7 @@ EXPORT_SYMBOL_GPL(debugfs_remove);
  */
 void debugfs_remove_recursive(struct dentry *dentry)
 {
-       struct dentry *child;
-       struct dentry *parent;
+       struct dentry *child, *next, *parent;
 
        if (IS_ERR_OR_NULL(dentry))
                return;
@@ -544,61 +543,37 @@ void debugfs_remove_recursive(struct dentry *dentry)
                return;
 
        parent = dentry;
+ down:
        mutex_lock(&parent->d_inode->i_mutex);
+       list_for_each_entry_safe(child, next, &parent->d_subdirs, d_child) {
+               if (!debugfs_positive(child))
+                       continue;
 
-       while (1) {
-               /*
-                * When all dentries under "parent" has been removed,
-                * walk up the tree until we reach our starting point.
-                */
-               if (list_empty(&parent->d_subdirs)) {
-                       mutex_unlock(&parent->d_inode->i_mutex);
-                       if (parent == dentry)
-                               break;
-                       parent = parent->d_parent;
-                       mutex_lock(&parent->d_inode->i_mutex);
-               }
-               child = list_entry(parent->d_subdirs.next, struct dentry,
-                               d_u.d_child);
- next_sibling:
-
-               /*
-                * If "child" isn't empty, walk down the tree and
-                * remove all its descendants first.
-                */
+               /* perhaps simple_empty(child) makes more sense */
                if (!list_empty(&child->d_subdirs)) {
                        mutex_unlock(&parent->d_inode->i_mutex);
                        parent = child;
-                       mutex_lock(&parent->d_inode->i_mutex);
-                       continue;
+                       goto down;
                }
-               __debugfs_remove(child, parent);
-               if (parent->d_subdirs.next == &child->d_u.d_child) {
-                       /*
-                        * Try the next sibling.
-                        */
-                       if (child->d_u.d_child.next != &parent->d_subdirs) {
-                               child = list_entry(child->d_u.d_child.next,
-                                                  struct dentry,
-                                                  d_u.d_child);
-                               goto next_sibling;
-                       }
-
-                       /*
-                        * Avoid infinite loop if we fail to remove
-                        * one dentry.
-                        */
-                       mutex_unlock(&parent->d_inode->i_mutex);
-                       break;
-               }
-               simple_release_fs(&debugfs_mount, &debugfs_mount_count);
+ up:
+               if (!__debugfs_remove(child, parent))
+                       simple_release_fs(&debugfs_mount, &debugfs_mount_count);
        }
 
-       parent = dentry->d_parent;
+       mutex_unlock(&parent->d_inode->i_mutex);
+       child = parent;
+       parent = parent->d_parent;
        mutex_lock(&parent->d_inode->i_mutex);
-       __debugfs_remove(dentry, parent);
+
+       if (child != dentry) {
+               next = list_entry(child->d_child.next, struct dentry,
+                                       d_child);
+               goto up;
+       }
+
+       if (!__debugfs_remove(child, parent))
+               simple_release_fs(&debugfs_mount, &debugfs_mount_count);
        mutex_unlock(&parent->d_inode->i_mutex);
-       simple_release_fs(&debugfs_mount, &debugfs_mount_count);
 }
 EXPORT_SYMBOL_GPL(debugfs_remove_recursive);