new primitive: debugfs_create_automount() (77b3da6e) · Commits · e / devices / android_kernel_fairphone_FP4

fs/debugfs/inode.c

+48 −0

Original line number	Diff line number	Diff line
		@@ -175,6 +175,18 @@ static const struct super_operations debugfs_super_operations = {
		.show_options = debugfs_show_options,
		};

		static struct vfsmount debugfs_automount(struct path path)
		{
		struct vfsmount (f)(void *);
		f = (struct vfsmount ()(void *))path->dentry->d_fsdata;
		return f(path->dentry->d_inode->i_private);
		}

		static const struct dentry_operations debugfs_dops = {
		.d_delete = always_delete_dentry,
		.d_automount = debugfs_automount,
		};

		static int debug_fill_super(struct super_block sb, void data, int silent)
		{
		static struct tree_descr debug_files[] = {{""}};
		@@ -199,6 +211,7 @@ static int debug_fill_super(struct super_block sb, void data, int silent)
		goto fail;

		sb->s_op = &debugfs_super_operations;
		sb->s_d_op = &debugfs_dops;

		debugfs_apply_options(sb);

		@@ -367,6 +380,41 @@ struct dentry debugfs_create_dir(const char name, struct dentry *parent)
		}
		EXPORT_SYMBOL_GPL(debugfs_create_dir);

		/**
		* debugfs_create_automount - create automount point in the debugfs filesystem
		* @name: a pointer to a string containing the name of the file to create.
		* @parent: a pointer to the parent dentry for this file. This should be a
		* directory dentry if set. If this parameter is NULL, then the
		* file will be created in the root of the debugfs filesystem.
		* @f: function to be called when pathname resolution steps on that one.
		* @data: opaque argument to pass to f().
		*
		* @f should return what ->d_automount() would.
		*/
		struct dentry debugfs_create_automount(const char name,
		struct dentry *parent,
		struct vfsmount (f)(void *),
		void *data)
		{
		struct dentry *dentry = start_creating(name, parent);
		struct inode *inode;

		if (IS_ERR(dentry))
		return NULL;

		inode = debugfs_get_inode(dentry->d_sb);
		if (unlikely(!inode))
		return failed_creating(dentry);

		inode->i_mode = S_IFDIR \| S_IRWXU \| S_IRUGO \| S_IXUGO;
		inode->i_flags \|= S_AUTOMOUNT;
		inode->i_private = data;
		dentry->d_fsdata = (void *)f;
		d_instantiate(dentry, inode);
		return end_creating(dentry);
		}
		EXPORT_SYMBOL(debugfs_create_automount);

		/**
		* debugfs_create_symlink- create a symbolic link in the debugfs filesystem
		* @name: a pointer to a string containing the name of the symbolic link to

include/linux/debugfs.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -56,6 +56,11 @@ struct dentry debugfs_create_dir(const char name, struct dentry *parent);
		struct dentry debugfs_create_symlink(const char name, struct dentry *parent,
		const char *dest);

		struct dentry debugfs_create_automount(const char name,
		struct dentry *parent,
		struct vfsmount (f)(void *),
		void *data);

		void debugfs_remove(struct dentry *dentry);
		void debugfs_remove_recursive(struct dentry *dentry);