函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:include\linux\pagemap.h Create Date:2022-07-27 06:45:57
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：find_subpage

函数原型：static inline struct page *find_subpage(struct page *page, unsigned long offset)

返回类型：struct page

参数：

类型参数名称
struct page *page
unsigned longoffset
338  如果PageHuge() only returns true for hugetlbfs pages, but not for normal or* transparent huge pages. See the PageTransHuge() documentation for more* details.则返回:page
341  VM_BUG_ON_PAGE(PageTail(page), page)
343  返回:page加offset按位与Returns the number of pages in this potentially compound page. 减1的值
调用者
名称描述
find_get_entryd_get_entry - find and get a page cache entry*@mapping: the address_space to search*@offset: the page cache index* Looks up the page cache slot at @mapping & @offset
find_get_entriesd_get_entries - gang pagecache lookup*@mapping: The address_space to search*@start: The starting page cache index*@nr_entries: The maximum number of entries*@entries: Where the resulting entries are placed*@indices: The cache indices corresponding to the
find_get_pages_ranged_get_pages_range - gang pagecache lookup*@mapping: The address_space to search*@start: The starting page index*@end: The final page index (inclusive)*@nr_pages: The maximum number of pages*@pages: Where the resulting pages are placed*
find_get_pages_contigd_get_pages_contig - gang contiguous pagecache lookup*@mapping: The address_space to search*@index: The starting page index*@nr_pages: The maximum number of pages*@pages: Where the resulting pages are placed* find_get_pages_contig() works exactly like
find_get_pages_range_tagd_get_pages_range_tag - find and return pages in given range matching @tag*@mapping: the address_space to search*@index: the starting page index*@end: The final page index (inclusive)*@tag: the tag index*@nr_pages: the maximum number of pages*@pages:
filemap_map_pages
memfd_tag_pins
memfd_wait_for_pinsSetting SEAL_WRITE requires us to verify there's no pending writer. However,* via get_user_pages(), drivers might have some pending I/O without any active* user-space mappings (eg., direct-IO, AIO). Therefore, we look at all pages