unlock_mount

**调用者**
名称	描述
mnt_make_readonly
__mnt_unmake_readonly
sb_prepare_remount_readonly
__legitimize_mnt	all under rcu_read_lock
vfs_create_mount	vfs_create_mount - Create a mount for a configured superblock@fc: The configuration context with the superblock attached Create a mount to an already configured superblock. If necessary, the* caller should invoke vfs_get_tree() before calling this.
clone_mnt
mntput_no_expire
may_umount_tree	may_umount_tree - check if a mount tree is busy@mnt: root of mount tree This is called to check if a tree of mounts has any* open files, pwds, chroots or sub mounts that are* busy.
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.
do_umount
__detach_mounts	__detach_mounts - lazily unmount all mounts on the specified dentry* During unlink, rmdir, and d_drop it is possible to loose the path* to an existing mountpoint, and wind up leaking the mount
copy_tree
dissolve_on_fput
drop_collected_mounts
attach_recursive_mnt	@source_mnt : mount tree to be attached@nd : place the mount tree @source_mnt is attached@parent_nd : if non-null, detach the source_mnt from its parent and* store the parent mount and mountpoint dentry
do_change_type	rsively change the type of the mountpoint.
do_loopback	do loopback mount.
open_detached_copy
set_mount_attributes	Update the user-settable attributes on a mount. The caller must hold* sb->s_umount for writing.
check_for_nsfs_mounts	Check that there aren't references to earlier/same mount namespaces in the* specified subtree. Such references can act as pins for mount namespaces* that aren't checked by the mount-cycle checking code, thereby allowing* cycles to be made.
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
copy_mnt_ns
SYSCALL_DEFINE2	pivot_root Semantics:* Moves the root file system of the current process to the directory put_old,* makes new_root as the new root file system of the current process, and sets* root/cwd of all processes which had them on the current root to new_root

函数逻辑报告