centos man page for vfs_unlink

VFS_UNLINK(9)							   The Linux VFS						     VFS_UNLINK(9)

NAME
       vfs_unlink - unlink a filesystem object

SYNOPSIS
       int vfs_unlink(struct inode * dir, struct dentry * dentry, struct inode ** delegated_inode);

ARGUMENTS
       dir
	   parent directory

       dentry
	   victim

       delegated_inode
	   returns victim inode, if the inode is delegated.

DESCRIPTION
       The caller must hold dir->i_mutex.

       If vfs_unlink discovers a delegation, it will return -EWOULDBLOCK and return a reference to the inode in delegated_inode. The caller should
       then break the delegation on that inode and retry. Because breaking a delegation may take a long time, the caller should drop dir->i_mutex
       before doing so.

       Alternatively, a caller may pass NULL for delegated_inode. This may be appropriate for callers that expect the underlying filesystem not to
       be NFS exported.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							     VFS_UNLINK(9)