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 15:35:09
Last Modify:2022-05-23 13:25:58 Copyright©Brick
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函数名称：__test_set_page_writeback

函数原型：int __test_set_page_writeback(struct page *page, bool keep_write)

返回类型：int

参数：

类型参数名称
struct page *page
boolkeep_write
2766  mapping等于page_mapping(page)
2769  lock_page_memcg(page)
2770  如果mapping且mapping_use_writeback_tags(mapping)则
2771  XA_STATE() - Declare an XArray operation state.*@name: Name of this operation state (usually xas).*@array: Array to operate on.*@index: Initial index of interest.* Declare and initialise an xa_state on the stack.(xas, & i_pages, Return the pagecache index of the passed page. Regular pagecache pages* use ->index whereas swapcache pages use swp_offset(->private))
2772  inode等于host
2773  bdi等于inode_to_bdi(inode)
2776  xas_lock_irqsave( & xas, flags)
2777  xas_load() - Load an entry from the XArray (advanced).*@xas: XArray operation state.* Usually walks the @xas to the appropriate state to load the entry* stored at xa_index. However, it will do nothing and return %NULL if*@xas is in an error state
2778  ret等于TestSetPageWriteback(page)
2779  如果非ret则
2782  on_wblist等于Returns true if any of the pages in the mapping are marked with the tag.
2785  xas_set_mark() - Sets the mark on this entry and its parents.*@xas: XArray operation state.*@mark: Mark number.* Sets the specified mark on this entry, and walks up the tree setting it* on all the ancestor entries
2786  如果bdi_cap_account_writeback(bdi)则inc_wb_stat(inode_to_wb(inode), WB_WRITEBACK)
2794  如果host且非on_wblist则mark an inode as under writeback on the sb
2797  如果非PageDirty(page)则xas_clear_mark() - Clears the mark on this entry and its parents.*@xas: XArray operation state.*@mark: Mark number.* Clears the specified mark on this entry, and walks back to the head* attempting to clear it on all the ancestor entries. Does nothing if
2799  如果非keep_write则xas_clear_mark() - Clears the mark on this entry and its parents.*@xas: XArray operation state.*@mark: Mark number.* Clears the specified mark on this entry, and walks back to the head* attempting to clear it on all the ancestor entries. Does nothing if
2801  xas_unlock_irqrestore( & xas, flags)
2802  否则
2803  ret等于TestSetPageWriteback(page)
2805  如果非ret则
2806  inc_lruvec_page_state(page, NR_WRITEBACK)
2807  We only use atomic operations to update counters. So there is no need to* disable interrupts.(page, NR_ZONE_WRITE_PENDING)
2809  unlock_page_memcg(page)
2810  返回:ret