- int vfs_link(struct dentry * old_dentry, struct inode * dir, struct dentry * new_dentry, struct inode ** delegated_inode);
- object to be linked
- new parent
- where to create the new link
- returns inode needing a delegation break
The caller must hold dir->i_mutex
If vfs_link discovers a delegation on the to-be-linked file in need of breaking, it will return -EWOULDBLOCK and return a reference to the inode in delegated_inode. The caller should then break the delegation and retry. Because breaking a delegation may take a long time, the caller should drop the 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.