函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\namei.c Create Date:2022-07-29 10:34:54
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Follow down to the covering mount currently visible to userspace. At each* point, the filesystem owning that dentry may be queried as to whether the* caller is permitted to proceed or not.

函数原型：int follow_down(struct path *path)

返回类型：int

参数：

类型参数名称
struct path *path
1415  当managed等于READ_ONCE( protected by d_lock ), 此条件成立可能性小(为编译器优化)(managed & DCACHE_MANAGED_DENTRY)循环
1427  如果managed按位与manage transit from this dirent 则
1428  BUG_ON(!d_op)
1429  BUG_ON(!d_manage)
1430  ret等于d_manage(path, false)
1431  如果ret小于0则返回:如果ret恒等于负EISDIR则0否则ret
1436  如果managed按位与s a mountpoint 则
1437  mounted等于lookup_mnt(path)
1438  如果非mounted则退出
1440  dput(dentry)
1441  mntput(mnt)
1442  mnt等于mounted
1443  dentry等于获得目录项引用
1444  继续下一循环
1448  退出
1450  返回:0