函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\truncate.c Create Date:2022-07-27 15:38:26
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：validate_mapping_pages - Invalidate all the unlocked pages of one inode*@mapping: the address_space which holds the pages to invalidate*@start: the offset 'from' which to invalidate*@end: the offset 'to' which to invalidate (inclusive)* This function only

函数原型：unsigned long invalidate_mapping_pages(struct address_space *mapping, unsigned long start, unsigned long end)

返回类型：unsigned long

参数：

类型参数名称
struct address_space *mapping
unsigned longstart
unsigned longend
551  index等于start
553  count等于0
556  pagevec_init( & pvec)
557  当index小于等于end且pagevec_lookup_entries - gang pagecache lookup*@pvec: Where the resulting entries are placed*@mapping: The address_space to search*@start: The starting entry index*@nr_entries: The maximum number of pages*@indices: The cache indices corresponding to the 循环
560  以i小于pagevec_count( & pvec)循环
561  page等于pages[i]
564  index等于indices[i]
565  如果index大于end则退出
568  如果xa_is_value() - Determine if an entry is a value.*@entry: XArray entry.* Context: Any context.* Return: True if the entry is a value, false if it is a pointer.则
574  如果非Return true if the page was successfully locked则继续下一循环
577  WARN_ON(Get index of the page with in radix-tree* (TODO: remove once hugetlb pages will have ->index in PAGE_SIZE) != index)
580  如果PageTransTail returns true for both transparent huge pages* and hugetlbfs pages, so it should only be called when it's known* that hugetlbfs pages aren't involved.则
583  否则如果PageHuge() only returns true for hugetlbfs pages, but not for* normal or transparent huge pages.* PageTransHuge() returns true for both transparent huge and* hugetlbfs pages, but not normal pages. PageTransHuge() can only be则
607  ret等于Safely invalidate one page from its pagecache mapping.* It only drops clean, unused pages. The page must be locked.* Returns 1 if the page is successfully invalidated, otherwise 0.
608  lock_page - unlock a locked page*@page: the page* Unlocks the page and wakes up sleepers in ___wait_on_page_locked().* Also wakes sleepers in wait_on_page_writeback() because the wakeup* mechanism between PageLocked pages and PageWriteback pages is shared.
613  如果非ret则deactivate_file_page - forcefully deactivate a file page*@page: page to deactivate* This function hints the VM that @page is a good reclaim candidate,* for example if its invalidation fails due to the page being dirty* or under writeback.
615  如果PageHuge() only returns true for hugetlbfs pages, but not for* normal or transparent huge pages.* PageTransHuge() returns true for both transparent huge and* hugetlbfs pages, but not normal pages. PageTransHuge() can only be则put_page(page)
617  count加等于ret
619  pagevec_remove_exceptionals - pagevec exceptionals pruning*@pvec: The pagevec to prune* pagevec_lookup_entries() fills both pages and exceptional radix* tree entries into the pagevec
620  pagevec_release( & pvec)
621  cond_resched()
622  index自加
624  返回:count
调用者
名称描述
generic_fadvisePOSIX_FADV_WILLNEED could set PG_Referenced, and POSIX_FADV_NOREUSE could* deactivate the pages and clear PG_Referenced.
invalidate_bdevInvalidate clean unused buffers and pagecache.
drop_pagecache_sb
__generic_file_write_iter__generic_file_write_iter - write data to a file*@iocb: IO state structure (file, offset, etc.)*@from: iov_iter with data to write* This function does all the work needed for actually writing data to a* file
invalidate_remote_inode
inode_lru_isolateIsolate the inode from the LRU in preparation for freeing it