propagate_mount

函数名称：heck if the mount 'mnt' can be unmounted successfully.*@mnt: the mount to be checked for unmount* NOTE: unmounting 'mnt' would naturally propagate to all* other mounts its parent propagates to.* Check if any of these mounts that **do not have submounts**

函数原型：int propagate_mount_busy(struct mount *mnt, int refcnt)

返回类型：int

参数：

类型	参数	名称
struct mount *	mnt
int	refcnt

**调用者**
名称	描述
do_umount
mark_mounts_for_expiry	process a list of expirable mountpoints with the intent of discarding any* mountpoints that aren't in use and haven't been touched since last we came* here
select_submounts	Ripoff of 'select_parent()'* search the list of submounts for a given mountpoint, and move any* shrinkable submounts to the 'graveyard' list.
may_umount	may_umount - check if a mount point is busy@mnt: root of mount This is called to check if a mount point has any* open files, pwds, chroots or sub mounts. If the* mount has sub mounts this will return busy* regardless of whether the sub mounts are busy.

函数逻辑报告