函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\fs-writeback.c Create Date:2022-07-29 10:41:28
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Write out an inode and its dirty pages. Do not update the writeback list* linkage. That is left to the caller. The caller is also responsible for* setting I_SYNC flag and calling inode_sync_complete() to clear it.

函数原型：static int __writeback_single_inode(struct inode *inode, struct writeback_control *wbc)

返回类型：int

参数：

类型参数名称
struct inode *inode
struct writeback_control *wbc
1443  mapping等于i_mapping
1444  nr_to_write等于Write this many pages, and decrementthis for each page written
1448  WARN_ON(!(Misc & I_SYNC))
1450  trace_writeback_single_inode_start(inode, wbc, nr_to_write)
1452  ret等于do_writepages(mapping, wbc)
1461  如果sync_mode恒等于Wait on every mapping 且非sync(2) WB_SYNC_ALL writeback 则
1462  err等于filemap_fdatawait(mapping)
1463  如果ret恒等于0则ret等于err
1472  加自旋锁
1474  dirty等于Misc 按位与I_DIRTY
1475  如果Misc 按位与I_DIRTY_TIME则
1476  如果dirty按位与I_DIRTY_INODE或sync_mode恒等于Wait on every mapping 或此条件成立可能性小(为编译器优化)(Misc & I_DIRTY_TIME_EXPIRED)或此条件成立可能性小(为编译器优化)(These inlines deal with timer wrapping correctly. You are * strongly encouraged to use them* 1. Because people otherwise forget* 2. Because if the timer wrap changes in future you won't have to* alter your driver code.(jiffies, (dirtied_time_when + If an inode is constantly having its pages dirtied, but then the* updates stop dirtytime_expire_interval seconds in the past, it's* possible for the worst case time between when an inode has its* timestamps updated and when they finally get written out to * HZ)))则
1482  dirty或等于I_DIRTY_TIME按位或I_DIRTY_TIME_EXPIRED
1483  trace_writeback_lazytime(inode)
1485  否则Misc 与等于I_DIRTY_TIME_EXPIRED的反
1487  Misc 与等于dirty的反
1500  smp_mb()
1502  如果Returns true if any of the pages in the mapping are marked with the tag.则Misc 或等于I_DIRTY_PAGES
1505  自旋锁解锁
1507  如果dirty按位与I_DIRTY_TIME则mark_inode_dirty_sync(inode)
1510  如果dirty按位与I_DIRTY_PAGES的反则
1511  err等于write_inode(inode, wbc)
1512  如果ret恒等于0则ret等于err
1515  trace_writeback_single_inode(inode, wbc, nr_to_write)
1516  返回:ret
调用者
名称描述
writeback_single_inodeWrite out an inode's dirty pages. Either the caller has an active reference* on the inode or the inode has I_WILL_FREE set.* This function is designed to be called for writing back one inode which* we go e
writeback_sb_inodesWrite a portion of b_io inodes which belong to @sb.* Return the number of pages and/or inodes written.* NOTE! This is called with wb->list_lock held, and will* unlock and relock that for each inode it ends up doing* IO for.