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 15:38:19
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：runcate_inode_pages_range - truncate range of pages specified by start & end byte offsets*@mapping: mapping to truncate*@lstart: offset from which to truncate*@lend: offset to which to truncate (inclusive)* Truncate the page cache, removing the pages that

函数原型：void truncate_inode_pages_range(struct address_space *mapping, loff_t lstart, loff_t lend)

返回类型：void

参数：

类型参数名称
struct address_space *mapping
loff_tlstart
loff_tlend
303  如果nrpages恒等于0且nrexceptional恒等于0则转到:out
307  partial_start等于lstart按位与PAGE_SIZE减1
308  partial_end等于lend加1按位与PAGE_SIZE减1
316  start等于lstart加PAGE_SIZE减1右移PAGE_SHIFT determines the page size 位
317  如果lend恒等于负1则end等于负1
324  否则end等于lend加1右移PAGE_SHIFT determines the page size 位
327  pagevec_init( & pvec)
328  index等于start
329  当index小于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
339  pagevec_init( & locked_pvec)
340  以i小于pagevec_count( & pvec)循环
341  page等于pages[i]
344  index等于indices[i]
345  如果index大于等于end则退出
348  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.则继续下一循环
351  如果非Return true if the page was successfully locked则继续下一循环
353  WARN_ON(Get index of the page with in radix-tree* (TODO: remove once hugetlb pages will have ->index in PAGE_SIZE) != index)
354  如果Only test-and-set exist for PG_writeback. The unconditional operators are* risky: they bypass page accounting.则
358  如果 See page-flags.h for PAGE_MAPPING_FLAGS 不等于mapping则
362  Add a page to a pagevec. Returns the number of slots still available.
364  以i小于pagevec_count( & locked_pvec)循环If truncate cannot remove the fs-private metadata from the page, the page* becomes orphaned
366  delete_from_page_cache_batch(mapping, & locked_pvec)
367  以i小于pagevec_count( & locked_pvec)循环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.
369  Unconditionally remove exceptional entries. Usually called from truncate* path. Note that the pagevec may be altered by this function by removing* exceptional entries similar to what pagevec_remove_exceptionals does.
370  pagevec_release( & pvec)
371  cond_resched()
372  index自加
374  如果partial_start则
375  page等于d_lock_page - locate, pin and lock a pagecache page*@mapping: the address_space to search*@offset: the page index* Looks up the page cache slot at @mapping & @offset. If there is a* page cache page, it is returned locked and with an increased* refcount.
376  如果page则
377  top等于PAGE_SIZE
378  如果start大于end则
380  top等于partial_end
381  partial_end等于0
383  Wait for a page to complete writeback
384  zero_user_segment(page, partial_start, top)
385  cleancache_invalidate_page(mapping, page)
386  如果页面私有占用则do_invalidatepage - invalidate part or all of a page*@page: the page which is affected*@offset: start of the range to invalidate*@length: length of the range to invalidate* do_invalidatepage() is called when all or part of the page has become
389  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.
390  put_page(page)
393  如果partial_end则
394  page等于d_lock_page - locate, pin and lock a pagecache page*@mapping: the address_space to search*@offset: the page index* Looks up the page cache slot at @mapping & @offset. If there is a* page cache page, it is returned locked and with an increased* refcount.
395  如果page则
396  Wait for a page to complete writeback
397  zero_user_segment(page, 0, partial_end)
398  cleancache_invalidate_page(mapping, page)
399  如果页面私有占用则do_invalidatepage - invalidate part or all of a page*@page: the page which is affected*@offset: start of the range to invalidate*@length: length of the range to invalidate* do_invalidatepage() is called when all or part of the page has become
402  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.
403  put_page(page)
410  如果start大于等于end则转到:out
413  index等于start
414  循环
415  cond_resched()
416  如果非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 则
419  如果index恒等于start则退出
422  index等于start
423  继续下一循环
425  如果index恒等于start且indices[0]大于等于end则
427  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
428  pagevec_release( & pvec)
429  退出
432  以i小于pagevec_count( & pvec)循环
433  page等于pages[i]
436  index等于indices[i]
437  如果index大于等于end则
439  index等于start减1
440  退出
443  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.则继续下一循环
446  lock_page may only be called if we have the page's inode pinned.
447  WARN_ON(Get index of the page with in radix-tree* (TODO: remove once hugetlb pages will have ->index in PAGE_SIZE) != index)
448  Wait for a page to complete writeback
449  truncate_inode_page(mapping, page)
450  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.
452  Unconditionally remove exceptional entries. Usually called from truncate* path. Note that the pagevec may be altered by this function by removing* exceptional entries similar to what pagevec_remove_exceptionals does.
453  pagevec_release( & pvec)
454  index自加
457  out :
458  cleancache_invalidate_inode(mapping)
调用者
名称描述
truncate_inode_pagesruncate_inode_pages - truncate *all* the pages from an offset*@mapping: mapping to truncate*@lstart: offset from which to truncate* Called under (and serialised by) inode->i_mutex.* Note: When this function returns, there can be a page in the process of
truncate_pagecache_rangeruncate_pagecache_range - unmap and remove pagecache that is hole-punched*@inode: inode*@lstart: offset of beginning of hole*@lend: offset of last byte of hole* This function should typically be called before the filesystem
shmem_truncate_range
blk_ioctl_zeroout
blk_ioctl_discard
blkdev_fallocate