函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\page-writeback.c Create Date:2022-07-27 15:34:37
Last Modify:2022-05-23 13:25:58 Copyright©Brick
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函数名称：write_cache_pages - walk the list of dirty pages of the given address space and write all of them

函数原型：int write_cache_pages(struct address_space *mapping, struct writeback_control *wbc, writepage_t writepage, void *data)

返回类型：int

参数：

类型参数名称
struct address_space *mapping
struct writeback_control *wbc
writepage_twritepage
void *data
2162  ret等于0
2163  done等于0
2167  writeback_index等于writeback_index
2171  range_whole等于0
2174  pagevec_init( & pvec)
2175  如果ange_start is cyclic 则
2176  writeback_index等于writeback_index
2177  index等于writeback_index
2178  end等于负1
2179  否则
2180  index等于For a_ops->writepages(): if start or end are non-zero then this is* a hint that the filesystem need only write out the pages inside that* byterange. The byte at `end' is included in the writeout request.右移PAGE_SHIFT determines the page size 位
2181  end等于range_end右移PAGE_SHIFT determines the page size 位
2182  如果For a_ops->writepages(): if start or end are non-zero then this is* a hint that the filesystem need only write out the pages inside that* byterange. The byte at `end' is included in the writeout request.恒等于0且range_end恒等于LLONG_MAX则range_whole等于1
2185  如果sync_mode恒等于WB_SYNC_ALL或ag-and-write to avoid livelock 则tag等于PAGECACHE_TAG_TOWRITE
2187  否则tag等于XArray tags, for tagging dirty and writeback pages in the pagecache.
2189  如果sync_mode恒等于WB_SYNC_ALL或ag-and-write to avoid livelock 则ag_pages_for_writeback - tag pages to be written by write_cache_pages*@mapping: address space structure to write*@start: starting page index*@end: ending page index (inclusive)* This function scans the page range from @start to @end (inclusive) and tags
2191  done_index等于index
2192  当非done且index小于等于end循环
2195  nr_pages等于pagevec_lookup_range_tag( & pvec, mapping, & index, end, tag)
2197  如果nr_pages恒等于0则退出
2200  以i小于nr_pages循环
2201  page等于pages[i]
2203  done_index等于 Our offset within mapping.
2205  lock_page may only be called if we have the page's inode pinned.
2215  如果此条件成立可能性小(为编译器优化)( See page-flags.h for PAGE_MAPPING_FLAGS != mapping)则
2221  如果非PageDirty(page)则
2223  转到:continue_unlock
2226  如果Only test-and-set exist for PG_writeback. The unconditional operators are* risky: they bypass page accounting.则
2233  BUG_ON(Only test-and-set exist for PG_writeback. The unconditional operators are* risky: they bypass page accounting.)
2234  如果非Clear a page's dirty flag, while caring for dirty memory accounting.* Returns true if the page was previously dirty.* This is for preparing to put the page under writeout. We leave the page* tagged as dirty in the xarray so that a concurrent write-for-sync则转到:continue_unlock
2237  trace_wbc_writepage(wbc, inode_to_bdi(host))
2238  error = ( * writepage)(page, wbc, data)
2239  如果此条件成立可能性小(为编译器优化)(error)则
2271  如果Write this many pages, and decrementthis for each page written 先自减小于等于0且sync_mode恒等于WB_SYNC_NONE则
2273  done等于1
2274  退出
2277  pagevec_release( & pvec)
2278  cond_resched()
2286  如果ange_start is cyclic 且非done则done_index等于0
2288  如果ange_start is cyclic 或range_whole且Write this many pages, and decrementthis for each page written 大于0则writeback_index等于done_index
2291  返回:ret
调用者
名称描述
generic_writepagesgeneric_writepages - walk the list of dirty pages of the given address space and writepage() all of them
iomap_writepages
mpage_writepagesmpage_writepages - walk the list of dirty pages of the given address space & writepage() all of them*@mapping: address space structure to write*@wbc: subtract the number of written pages from *@wbc->nr_to_write