Edge Cases and Corner Conditions

async def rmdir(self, parent_inode, name, ctx):
    """Remove directory - must check if empty."""
    inode = self._find_entry(parent_inode, name)
    
    # Check if empty
    if self.inodes[inode]['entries']:
        raise pyfuse3.FUSEError(errno.ENOTEMPTY)
    
    # Remove directory
    del self.inodes[parent_inode]['entries'][name]
    self.inodes[inode]['nlink'] -= 1

async def unlink(self, parent_inode, name, ctx):
    """Remove file - may still be open."""
    inode = self._find_entry(parent_inode, name)
    
    # Remove from directory
    del self.inodes[parent_inode]['entries'][name]
    
    # Decrement nlink
    self.inodes[inode]['nlink'] -= 1
    
    # Don't delete yet - may be open or have kernel references

async def read(self, fh, offset, size):
    """Handle reads beyond EOF."""
    data = self.inodes[fh]['data']
    
    # Reading beyond EOF
    if offset >= len(data):
        return b''
    
    # Partial read
    return data[offset:offset + size]

async def rename(self, parent_old, name_old, parent_new, name_new, flags, ctx):
    """Handle RENAME_NOREPLACE and RENAME_EXCHANGE."""
    inode_old = self._find_entry(parent_old, name_old)
    inode_new = self._find_entry(parent_new, name_new) if name_new in self.inodes[parent_new]['entries'] else None
    
    # RENAME_NOREPLACE
    if flags & pyfuse3.RENAME_NOREPLACE:
        if inode_new is not None:
            raise pyfuse3.FUSEError(errno.EEXIST)
    
    # RENAME_EXCHANGE
    if flags & pyfuse3.RENAME_EXCHANGE:
        if inode_new is None:
            raise pyfuse3.FUSEError(errno.ENOENT)
        # Exchange both entries
        self.inodes[parent_old]['entries'][name_old] = inode_new
        self.inodes[parent_new]['entries'][name_new] = inode_old
        return
    
    # Standard rename
    # ...