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-rw-r--r--fs/debugfs/inode.c114
-rw-r--r--include/linux/debugfs.h4
2 files changed, 100 insertions, 18 deletions
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index e9602d85c11..08e28c9bb41 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -309,6 +309,31 @@ struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
}
EXPORT_SYMBOL_GPL(debugfs_create_symlink);
+static void __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);
+ }
+ }
+}
+
/**
* debugfs_remove - removes a file or directory from the debugfs filesystem
* @dentry: a pointer to a the dentry of the file or directory to be
@@ -325,7 +350,6 @@ EXPORT_SYMBOL_GPL(debugfs_create_symlink);
void debugfs_remove(struct dentry *dentry)
{
struct dentry *parent;
- int ret = 0;
if (!dentry)
return;
@@ -335,29 +359,83 @@ void debugfs_remove(struct dentry *dentry)
return;
mutex_lock(&parent->d_inode->i_mutex);
- 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);
+ __debugfs_remove(dentry, parent);
+ mutex_unlock(&parent->d_inode->i_mutex);
+ simple_release_fs(&debugfs_mount, &debugfs_mount_count);
+}
+EXPORT_SYMBOL_GPL(debugfs_remove);
+
+/**
+ * debugfs_remove_recursive - recursively removes a directory
+ * @dentry: a pointer to a the dentry of the directory to be removed.
+ *
+ * This function recursively removes a directory tree in debugfs that
+ * was previously created with a call to another debugfs function
+ * (like debugfs_create_file() or variants thereof.)
+ *
+ * This function is required to be called in order for the file to be
+ * removed, no automatic cleanup of files will happen when a module is
+ * removed, you are responsible here.
+ */
+void debugfs_remove_recursive(struct dentry *dentry)
+{
+ struct dentry *child;
+ struct dentry *parent;
+
+ if (!dentry)
+ return;
+
+ parent = dentry->d_parent;
+ if (!parent || !parent->d_inode)
+ return;
+
+ parent = dentry;
+ mutex_lock(&parent->d_inode->i_mutex);
+
+ 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;
- }
- if (!ret)
- d_delete(dentry);
- dput(dentry);
+ parent = parent->d_parent;
+ mutex_lock(&parent->d_inode->i_mutex);
+ }
+ child = list_entry(parent->d_subdirs.next, struct dentry,
+ d_u.d_child);
+
+ /*
+ * If "child" isn't empty, walk down the tree and
+ * remove all its descendants first.
+ */
+ if (!list_empty(&child->d_subdirs)) {
+ mutex_unlock(&parent->d_inode->i_mutex);
+ parent = child;
+ mutex_lock(&parent->d_inode->i_mutex);
+ continue;
}
+ __debugfs_remove(child, parent);
+ if (parent->d_subdirs.next == &child->d_u.d_child) {
+ /*
+ * 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);
}
+
+ parent = dentry->d_parent;
+ mutex_lock(&parent->d_inode->i_mutex);
+ __debugfs_remove(dentry, parent);
mutex_unlock(&parent->d_inode->i_mutex);
simple_release_fs(&debugfs_mount, &debugfs_mount_count);
}
-EXPORT_SYMBOL_GPL(debugfs_remove);
+EXPORT_SYMBOL_GPL(debugfs_remove_recursive);
/**
* debugfs_rename - rename a file/directory in the debugfs filesystem
diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
index 32755cdf68d..e1a6c046cea 100644
--- a/include/linux/debugfs.h
+++ b/include/linux/debugfs.h
@@ -44,6 +44,7 @@ struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
const char *dest);
void debugfs_remove(struct dentry *dentry);
+void debugfs_remove_recursive(struct dentry *dentry);
struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
struct dentry *new_dir, const char *new_name);
@@ -101,6 +102,9 @@ static inline struct dentry *debugfs_create_symlink(const char *name,
static inline void debugfs_remove(struct dentry *dentry)
{ }
+static inline void debugfs_remove_recursive(struct dentry *dentry)
+{ }
+
static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
struct dentry *new_dir, char *new_name)
{