unmap_mapping

函数名称：map_mapping_pages() - Unmap pages from processes.*@mapping: The address space containing pages to be unmapped.*@start: Index of first page to be unmapped.*@nr: Number of pages to be unmapped. 0 to unmap to end of file.

函数原型：void unmap_mapping_pages(struct address_space *mapping, unsigned long start, unsigned long nr, bool even_cows)

返回类型：void

参数：

类型	参数	名称
struct address_space *	mapping
unsigned long	start
unsigned long	nr
bool	even_cows

**调用者**
名称	描述
invalidate_inode_pages2_range	validate_inode_pages2_range - remove range of pages from an address_space@mapping: the address_space@start: the page offset 'from' which to invalidate@end: the page offset 'to' which to invalidate (inclusive) Any pages which are found to be mapped
unmap_mapping_range	map_mapping_range - unmap the portion of all mmaps in the specified* address_space corresponding to the specified byte range in the underlying* file
dax_insert_entry	By this point grab_mapping_entry() has ensured that we have a locked entry* of the appropriate size so we don't have to worry about downgrading PMDs to* PTEs
truncate_cleanup_page	If truncate cannot remove the fs-private metadata from the page, the page* becomes orphaned
grab_mapping_entry	Find page cache entry at given index. If it is a DAX entry, return it* with the entry locked. If the page cache doesn't contain an entry at* that index, add a locked empty entry.* When requesting an entry with size DAX_PMD, grab_mapping_entry() will

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