31 #include <uapi/linux/mount.h>
40 /* Maximum number of mounts in a mount namespace */
72 /* Don't allow confusion with old 32bit mount ID */
146 	/* keep alive for {list,stat}mount() */  in mnt_ns_release()
156 	/* remove from global mount namespace list */  in DEFINE_FREE()
166  * Returns the mount namespace which either has the specified id, or has the
192  * Lookup a mount namespace by id and take a passive reference count. Taking a
193  * passive reference means the mount namespace can be emptied if e.g., the last
196  * already shut down before acquiring @namespace_sem, {list,stat}mount() will
197  * see that the mount rbtree of the namespace is empty.
237 static int mnt_alloc_id(struct mount *mnt)  in mnt_alloc_id()
248 static void mnt_free_id(struct mount *mnt)  in mnt_free_id()
256 static int mnt_alloc_group_id(struct mount *mnt)  in mnt_alloc_group_id()
269 void mnt_release_group_id(struct mount *mnt)  in mnt_release_group_id()
278 static inline void mnt_add_count(struct mount *mnt, int n)  in mnt_add_count()
292 int mnt_get_count(struct mount *mnt)  in mnt_get_count()
308 static struct mount *alloc_vfsmnt(const char *name)  in alloc_vfsmnt()
310 	struct mount *mnt = kmem_cache_zalloc(mnt_cache, GFP_KERNEL);  in alloc_vfsmnt()
371  * __mnt_is_readonly: check whether a mount is read-only
372  * @mnt: the mount to check for its write status
387 static inline void mnt_inc_writers(struct mount *mnt)  in mnt_inc_writers()
396 static inline void mnt_dec_writers(struct mount *mnt)  in mnt_dec_writers()
405 static unsigned int mnt_get_writers(struct mount *mnt)  in mnt_get_writers()
428 	 * not see any superblock / mount flag changes done by remount.  in mnt_is_readonly()
431 	 * see the values of superblock / mount flags updated by remount.  in mnt_is_readonly()
444  * mnt_get_write_access - get write access to a mount without freeze protection
445  * @m: the mount on which to take a write
455 	struct mount *mnt = real_mount(m);  in mnt_get_write_access()
503  * mnt_want_write - get write access to a mount
504  * @m: the mount on which to take a write
507  * it, and makes sure that writes are allowed (mount is read-write, filesystem
524  * mnt_get_write_access_file - get write access to a file's mount
525  * @file: the file who's mount on which to take a write
547  * mnt_want_write_file - get write access to a file's mount
548  * @file: the file who's mount on which to take a write
568  * mnt_put_write_access - give up write access to a mount
569  * @mnt: the mount on which to give up write access
584  * mnt_drop_write - give up write access to a mount
585  * @mnt: the mount on which to give up write access
612  * mnt_hold_writers - prevent write access to the given mount
629 static inline int mnt_hold_writers(struct mount *mnt)  in mnt_hold_writers()
661  * mnt_unhold_writers - stop preventing write access to the given mount
672 static inline void mnt_unhold_writers(struct mount *mnt)  in mnt_unhold_writers()
682 static int mnt_make_readonly(struct mount *mnt)  in mnt_make_readonly()
695 	struct mount *mnt;  in sb_prepare_remount_readonly()
724 static void free_vfsmnt(struct mount *mnt)  in free_vfsmnt()
736 	free_vfsmnt(container_of(head, struct mount, mnt_rcu));  in delayed_free_vfsmnt()
742 	struct mount *mnt;  in __legitimize_mnt()
782  * __lookup_mnt - find first child mount
783  * @mnt:	parent mount
786  * If @mnt has a child mount @c mounted @dentry find and return it.
788  * Note that the child mount @c need not be unique. There are cases
789  * where shadow mounts are created. For example, during mount
790  * propagation when a source mount @mnt whose root got overmounted by a
791  * mount @o after path lookup but before @namespace_sem could be
793  * @o. When @mnt is propagated to a destination mount @d that already
794  * has another mount @n mounted at the same mountpoint then the source
795  * mount @mnt will be tucked beneath @n, i.e., @n will be mounted on
801 struct mount *__lookup_mnt(struct vfsmount *mnt, struct dentry *dentry)  in __lookup_mnt()
804 	struct mount *p;  in __lookup_mnt()
813  * lookup_mnt - Return the first child mount mounted at path
818  * mount /dev/sda1 /mnt
819  * mount /dev/sda2 /mnt
820  * mount /dev/sda3 /mnt
822  * Then lookup_mnt() on the base /mnt dentry in the root mount will
830 	struct mount *child_mnt;  in lookup_mnt()
846  *                         current mount namespace.
851  * mounts in the current mount namespace and test to see if the dentry
855  * need to identify all mounts that may be in the current mount
856  * namespace not just a mount that happens to have some specified
857  * parent mount.
862 	struct mount *mnt, *n;  in __is_local_mountpoint()
964 static inline int check_mnt(struct mount *mnt)  in check_mnt()
994 static struct mountpoint *unhash_mnt(struct mount *mnt)  in unhash_mnt()
1010 static void umount_mnt(struct mount *mnt)  in umount_mnt()
1018 void mnt_set_mountpoint(struct mount *mnt,  in mnt_set_mountpoint()
1020 			struct mount *child_mnt)  in mnt_set_mountpoint()
1031  * mnt_set_mountpoint_beneath - mount a mount beneath another one
1033  * @new_parent: the source mount
1034  * @top_mnt:    the mount beneath which @new_parent is mounted
1038  * parent @top_mnt->mnt_parent and mount it on top of @new_parent at
1039  * @new_mp. And mount @new_parent on the old parent and old
1045 static void mnt_set_mountpoint_beneath(struct mount *new_parent,  in mnt_set_mountpoint_beneath()
1046 				       struct mount *top_mnt,  in mnt_set_mountpoint_beneath()
1049 	struct mount *old_top_parent = top_mnt->mnt_parent;  in mnt_set_mountpoint_beneath()
1057 static void __attach_mnt(struct mount *mnt, struct mount *parent)  in __attach_mnt()
1065  * attach_mnt - mount a mount, attach to @mount_hashtable and parent's
1068  * @mnt:     the new mount
1070  * @beneath: whether to mount @mnt beneath or on top of @parent
1072  * If @beneath is false, mount @mnt at @mp on @parent. Then attach @mnt
1073  * to @parent's child mount list and to @mount_hashtable.
1076  * mountpoint and mount it on @mp on @parent, and mount @parent on the
1086 static void attach_mnt(struct mount *mnt, struct mount *parent,  in attach_mnt()
1097 	 * isn't the same mount as @parent.  in attach_mnt()
1102 void mnt_change_mountpoint(struct mount *parent, struct mountpoint *mp, struct mount *mnt)  in mnt_change_mountpoint()
1105 	struct mount *old_parent = mnt->mnt_parent;  in mnt_change_mountpoint()
1117 static inline struct mount *node_to_mount(struct rb_node *node)  in node_to_mount()
1119 	return node ? rb_entry(node, struct mount, mnt_node) : NULL;  in node_to_mount()
1122 static void mnt_add_to_ns(struct mnt_namespace *ns, struct mount *mnt)  in mnt_add_to_ns()
1144 static void commit_tree(struct mount *mnt)  in commit_tree()
1146 	struct mount *parent = mnt->mnt_parent;  in commit_tree()
1147 	struct mount *m;  in commit_tree()
1167 static struct mount *next_mnt(struct mount *p, struct mount *root)  in next_mnt()
1180 	return list_entry(next, struct mount, mnt_child);  in next_mnt()
1183 static struct mount *skip_mnt_tree(struct mount *p)  in skip_mnt_tree()
1187 		p = list_entry(prev, struct mount, mnt_child);  in skip_mnt_tree()
1194  * vfs_create_mount - Create a mount for a configured superblock
1197  * Create a mount to an already configured superblock.  If necessary, the
1200  * Note that this does not attach the mount to anything.
1204 	struct mount *mnt;  in vfs_create_mount()
1275 	 * through from the parent mount to the submount don't support  in vfs_submount()
1285 static struct mount *clone_mnt(struct mount *old, struct dentry *root,  in clone_mnt()
1289 	struct mount *mnt;  in clone_mnt()
1338 	/* stick the duplicate mount on the same expiry list  in clone_mnt()
1353 static void cleanup_mnt(struct mount *mnt)  in cleanup_mnt()
1356 	struct mount *m;  in cleanup_mnt()
1380 	cleanup_mnt(container_of(head, struct mount, mnt_rcu));  in __cleanup_mnt()
1387 	struct mount *m, *t;  in delayed_mntput()
1394 static void mntput_no_expire(struct mount *mnt)  in mntput_no_expire()
1439 		struct mount *p, *tmp;  in mntput_no_expire()
1465 		struct mount *m = real_mount(mnt);  in mntput()
1483  * Make a mount point inaccessible to new lookups.
1485  * for an RCU grace period before destroying the mount point.
1494  * path_is_mountpoint() - Check if path is a mount in the current namespace.
1525 	struct mount *p;  in mnt_clone_internal()
1534  * Returns the mount which either has the specified mnt_id, or has the next
1537 static struct mount *mnt_find_id_at(struct mnt_namespace *ns, u64 mnt_id)  in mnt_find_id_at()
1540 	struct mount *ret = NULL;  in mnt_find_id_at()
1543 		struct mount *m = node_to_mount(node);  in mnt_find_id_at()
1558  * Returns the mount which either has the specified mnt_id, or has the next
1561 static struct mount *mnt_find_id_at_reverse(struct mnt_namespace *ns, u64 mnt_id)  in mnt_find_id_at_reverse()
1564 	struct mount *ret = NULL;  in mnt_find_id_at_reverse()
1567 		struct mount *m = node_to_mount(node);  in mnt_find_id_at_reverse()
1595 	struct mount *next = NULL, *mnt = v;  in m_next()
1614 	struct mount *r = v;  in m_show()
1628  * may_umount_tree - check if a mount tree is busy
1629  * @m: root of mount tree
1637 	struct mount *mnt = real_mount(m);  in may_umount_tree()
1640 	struct mount *p;  in may_umount_tree()
1660  * may_umount - check if a mount point is busy
1661  * @mnt: root of mount
1663  * This is called to check if a mount point has any
1665  * mount has sub mounts this will return busy
1690 	struct mount *m;  in namespace_unlock()
1722 static bool disconnect_mount(struct mount *mnt, enum umount_tree_flags how)  in disconnect_mount()
1728 	/* A mount without a parent has nothing to be connected to */  in disconnect_mount()
1739 	/* Has it been requested that the mount remain connected? */  in disconnect_mount()
1743 	/* Is the mount locked such that it needs to remain connected? */  in disconnect_mount()
1747 	/* By default disconnect the mount */  in disconnect_mount()
1755 static void umount_tree(struct mount *mnt, enum umount_tree_flags how)  in umount_tree()
1758 	struct mount *p;  in umount_tree()
1784 		p = list_first_entry(&tmp_list, struct mount, mnt_list);  in umount_tree()
1812 static void shrink_submounts(struct mount *mnt);
1837 static int do_umount(struct mount *mnt, int flags)  in do_umount()
1874 	 * mount, and they will themselves hold resources we must  in do_umount()
1878 	 * must return, and the like. Thats for the mount program to worry  in do_umount()
1939  * to an existing mountpoint, and wind up leaking the mount.
1948 	struct mount *mnt;  in __detach_mounts()
1958 		mnt = hlist_entry(mp->m_list.first, struct mount, mnt_mp_list);  in __detach_mounts()
1982 		     "WARNING: The mand mount option has been deprecated and\n"  in warn_mandlock()
1984 		     "         option from the mount to silence this warning.\n"  in warn_mandlock()
1990 	struct mount *mnt = real_mount(path->mnt);  in can_umount()
2008 	struct mount *mnt = real_mount(path->mnt);  in path_umount()
2058 	/* Is this a proxy for a mount namespace? */  in is_mnt_ns_file()
2088 		 * Holding mnt_ns_tree_lock prevents the mount namespace from  in __lookup_next_mnt_ns()
2091 		 * persisting the mount namespace.  in __lookup_next_mnt_ns()
2102 	/* Could bind mounting the mount namespace inode cause a  in mnt_ns_loop()
2103 	 * mount namespace loop?  in mnt_ns_loop()
2113 struct mount *copy_tree(struct mount *src_root, struct dentry *dentry,  in copy_tree()
2116 	struct mount *res, *src_parent, *src_root_child, *src_mnt,  in copy_tree()
2185 	struct mount *tree;  in collect_mounts()
2228 bool has_locked_children(struct mount *mnt, struct dentry *dentry)  in has_locked_children()
2230 	struct mount *child;  in has_locked_children()
2246  * This creates a new vfsmount, which will be the clone of @path.  The new mount
2248  * changes to the originating mount won't be propagated into this).
2254 	struct mount *old_mnt = real_mount(path->mnt);  in clone_private_mount()
2255 	struct mount *new_mnt;  in clone_private_mount()
2273 	/* Longterm mount to be removed by kern_unmount*() */  in clone_private_mount()
2287 	struct mount *mnt;  in iterate_mounts()
2299 static void lock_mnt_tree(struct mount *mnt)  in lock_mnt_tree()
2301 	struct mount *p;  in lock_mnt_tree()
2305 		/* Don't allow unprivileged users to change mount flags */  in lock_mnt_tree()
2319 		/* Don't allow unprivileged users to reveal what is under a mount */  in lock_mnt_tree()
2326 static void cleanup_group_ids(struct mount *mnt, struct mount *end)  in cleanup_group_ids()
2328 	struct mount *p;  in cleanup_group_ids()
2336 static int invent_group_ids(struct mount *mnt, bool recurse)  in invent_group_ids()
2338 	struct mount *p;  in invent_group_ids()
2353 int count_mounts(struct mnt_namespace *ns, struct mount *mnt)  in count_mounts()
2357 	struct mount *p;  in count_mounts()
2382  * attach_recursive_mnt - attach a source mount tree
2383  * @source_mnt: mount tree to be attached
2384  * @top_mnt:    mount that @source_mnt will be mounted on or mounted beneath
2388  *  NOTE: in the table below explains the semantics when a source mount
2389  *  of a given type is attached to a destination mount of a given type.
2391  * |         BIND MOUNT OPERATION                                            |
2402  * A bind operation clones the source mount and mounts the clone on the
2403  * destination mount.
2405  * (++)  the cloned mount is propagated to all the mounts in the propagation
2406  * 	 tree of the destination mount and the cloned mount is added to
2407  * 	 the peer group of the source mount.
2408  * (+)   the cloned mount is created under the destination mount and is marked
2409  *       as shared. The cloned mount is added to the peer group of the source
2410  *       mount.
2411  * (+++) the mount is propagated to all the mounts in the propagation tree
2412  *       of the destination mount and the cloned mount is made slave
2413  *       of the same master as that of the source mount. The cloned mount
2415  * (*)   the cloned mount is made a slave of the same master as that of the
2416  * 	 source mount.
2419  * |         		MOVE MOUNT OPERATION                                 |
2431  * (+)  the mount is moved to the destination. And is then propagated to
2432  * 	all the mounts in the propagation tree of the destination mount.
2433  * (+*)  the mount is moved to the destination.
2434  * (+++)  the mount is moved to the destination and is then propagated to
2435  * 	all the mounts belonging to the destination mount's propagation tree.
2436  * 	the mount is marked as 'shared and slave'.
2437  * (*)	the mount continues to be a slave at the new location.
2439  * if the source mount is a tree, the operations explained above is
2440  * applied to each mount in the tree.
2448 static int attach_recursive_mnt(struct mount *source_mnt,  in attach_recursive_mnt()
2449 				struct mount *top_mnt,  in attach_recursive_mnt()
2457 	struct mount *child, *dest_mnt, *p;  in attach_recursive_mnt()
2470 	/* Is there space to add these mounts to the mount namespace? */  in attach_recursive_mnt()
2520 		struct mount *q;  in attach_recursive_mnt()
2539 		child = hlist_entry(tree_list.first, struct mount, mnt_hash);  in attach_recursive_mnt()
2556  * do_lock_mount - lock mount and mountpoint
2558  * @beneath: whether the intention is to mount beneath @path
2560  * Follow the mount stack on @path until the top mount @mnt is found. If
2562  * mount stacked on top of it. Then simply follow @{mnt,mnt->mnt_root}
2565  * Acquire the inode_lock() on the top mount's ->mnt_root to protect
2566  * against concurrent removal of the new mountpoint from another mount
2571  * concurrent unlink of @mp->mnt_dentry from another mount namespace
2572  * where @mnt doesn't have a child mount mounted @mp. A concurrent
2586  * Return: Either the target mountpoint on the top mount or the top
2587  *         mount's mountpoint.
2596 		struct mount *m;  in do_lock_mount()
2664 static int graft_tree(struct mount *mnt, struct mount *p, struct mountpoint *mp)  in graft_tree()
2698 	struct mount *m;  in do_change_type()
2699 	struct mount *mnt = real_mount(path->mnt);  in do_change_type()
2728 static struct mount *__do_loopback(struct path *old_path, int recurse)  in __do_loopback()
2730 	struct mount *mnt = ERR_PTR(-EINVAL), *old = real_mount(old_path->mnt);  in __do_loopback()
2753  * do loopback mount.
2759 	struct mount *mnt = NULL, *parent;  in do_loopback()
2805 	struct mount *mnt, *p;  in open_detached_copy()
2891  * Don't allow locked mount flags to be cleared.
2896 static bool can_change_locked_flags(struct mount *mnt, unsigned int mnt_flags)  in can_change_locked_flags()
2923 static int change_mount_ro_state(struct mount *mnt, unsigned int mnt_flags)  in change_mount_ro_state()
2937 static void set_mount_attributes(struct mount *mnt, unsigned int mnt_flags)  in set_mount_attributes()
2976  * to mount(2).
2981 	struct mount *mnt = real_mount(path->mnt);  in do_reconfigure_mnt()
3020 	struct mount *mnt = real_mount(path->mnt);  in do_remount()
3038 	 * from the legacy mount system call.  in do_remount()
3063 static inline int tree_contains_unbindable(struct mount *mnt)  in tree_contains_unbindable()
3065 	struct mount *p;  in tree_contains_unbindable()
3074  * Check that there aren't references to earlier/same mount namespaces in the
3075  * specified subtree.  Such references can act as pins for mount namespaces
3076  * that aren't checked by the mount-cycle checking code, thereby allowing
3079 static bool check_for_nsfs_mounts(struct mount *subtree)  in check_for_nsfs_mounts()
3081 	struct mount *p;  in check_for_nsfs_mounts()
3097 	struct mount *from, *to;  in do_set_group()
3113 	/* We should be allowed to modify mount namespaces of both mounts */  in do_set_group()
3120 	/* To and From paths should be mount roots */  in do_set_group()
3130 	/* From mount root should be wider than To mount root */  in do_set_group()
3134 	/* From mount should not have locked children in place of To's root */  in do_set_group()
3147 		struct mount *m = from->mnt_master;  in do_set_group()
3171  * Check if path is overmounted, i.e., if there's a mount on top of
3189  * can_move_mount_beneath - check that we can mount beneath the top mount
3190  * @from: mount to mount beneath
3191  * @to:   mount under which to mount
3194  * - Make sure that @to->dentry is actually the root of a mount under
3195  *   which we can mount another mount.
3198  * - Make sure that the caller can unmount the topmost mount ensuring
3202  * - Prevent mounting beneath a mount if the propagation relationship
3203  *   between the source mount, parent mount, and top mount would lead to
3204  *   nonsensical mount trees.
3213 	struct mount *mnt_from = real_mount(from->mnt),  in can_move_mount_beneath()
3226 	/* Avoid creating shadow mounts during mount propagation. */  in can_move_mount_beneath()
3239 	for (struct mount *p = mnt_from; mnt_has_parent(p); p = p->mnt_parent)  in can_move_mount_beneath()
3244 	 * If the parent mount propagates to the child mount this would  in can_move_mount_beneath()
3247 	 * defeats the whole purpose of mounting beneath another mount.  in can_move_mount_beneath()
3274 	struct mount *p;  in do_move_mount()
3275 	struct mount *old;  in do_move_mount()
3276 	struct mount *parent;  in do_move_mount()
3318 	 * Don't move a mount residing in a shared parent.  in do_move_mount()
3334 	 * Don't move a mount tree containing unbindable mounts to a destination  in do_move_mount()
3335 	 * mount which is shared.  in do_move_mount()
3350 	/* if the mount is moved, it should no longer be expire  in do_move_mount()
3384  * add a mount into a namespace's mount tree
3386 static int do_add_mount(struct mount *newmnt, struct mountpoint *mp,  in do_add_mount()
3389 	struct mount *parent = real_mount(path->mnt);  in do_add_mount()
3402 	/* Refuse the same filesystem on the same mount point */  in do_add_mount()
3416  * Create a new mount using a superblock configuration and request it
3457  * create a new mount for userspace and request it to be added into the
3492 	 * Indicate to the filesystem that the mount request is coming  in do_new_mount()
3493 	 * from the legacy mount system call.  in do_new_mount()
3519 	struct mount *mnt;  in finish_automount()
3528 	/* The new mount record should have at least 2 refs to prevent it being  in finish_automount()
3542 	 * got", not "try to mount it on top".  in finish_automount()
3583  * mnt_set_expiry - Put a mount on an expiration list
3584  * @mnt: The mount to list.
3585  * @expiry_list: The list to add the mount to.
3604 	struct mount *mnt, *next;  in mark_mounts_for_expiry()
3626 		mnt = list_first_entry(&graveyard, struct mount, mnt_expire);  in mark_mounts_for_expiry()
3642 static int select_submounts(struct mount *parent, struct list_head *graveyard)  in select_submounts()
3644 	struct mount *this_parent = parent;  in select_submounts()
3653 		struct mount *mnt = list_entry(tmp, struct mount, mnt_child);  in select_submounts()
3688 static void shrink_submounts(struct mount *mnt)  in shrink_submounts()
3691 	struct mount *m;  in shrink_submounts()
3696 			m = list_first_entry(&graveyard, struct mount,  in shrink_submounts()
3747  * be given to the mount() call (ie: read-only, no-dev, no-suid etc).
3753  * Pre-0.97 versions of mount() didn't have a flags word.
3872  * mount a reference to an older mount namespace into the current
3873  * mount namespace, preventing reference counting loops.  A 64bit
3921 	struct mount *p, *q;  in copy_mnt_ns()
3922 	struct mount *old;  in copy_mnt_ns()
3923 	struct mount *new;  in copy_mnt_ns()
4000 	struct mount *mnt = real_mount(m);  in mount_subtree()
4034 SYSCALL_DEFINE5(mount, char __user *, dev_name, char __user *, dir_name,  in SYSCALL_DEFINE5()  argument
4099  * Create a kernel mount representation for a new, prepared superblock
4109 	struct mount *mnt;  in SYSCALL_DEFINE3()
4152 	/* There must be a valid superblock or we can't mount it */  in SYSCALL_DEFINE3()
4159 		pr_warn("VFS: Mount too revealing\n");  in SYSCALL_DEFINE3()
4178 	/* We've done the mount bit - now move the file context into more or  in SYSCALL_DEFINE3()
4223  * Move a mount from one place to another.  In combination with
4224  * fsopen()/fsmount() this is used to install a new mount and in combination
4226  * a mount subtree.
4293 bool is_path_reachable(struct mount *mnt, struct dentry *dentry,  in is_path_reachable()
4334  *    /nfs/my_root where /nfs is the mount point. It must be a mountpoint,
4335  *    though, so you may need to say mount --bind /nfs/my_root /nfs/my_root
4342 	struct mount *new_mnt, *root_mnt, *old_mnt, *root_parent, *ex_parent;  in SYSCALL_DEFINE2()
4411 	/* mount old root on put_old */  in SYSCALL_DEFINE2()
4413 	/* mount new_root on / */  in SYSCALL_DEFINE2()
4417 	/* A moved mount should not expire automatically */  in SYSCALL_DEFINE2()
4437 static unsigned int recalc_flags(struct mount_kattr *kattr, struct mount *mnt)  in recalc_flags()
4449 static int can_idmap_mount(const struct mount_kattr *kattr, struct mount *mnt)  in can_idmap_mount()
4458 	 * Creating an idmapped mount with the filesystem wide idmapping  in can_idmap_mount()
4465 	 * Once a mount has been idmapped we don't allow it to change its  in can_idmap_mount()
4467 	 * another bind-mount they can idmap if they want to.  in can_idmap_mount()
4484 	/* Mount has already been visible in the filesystem hierarchy. */  in can_idmap_mount()
4493  * @kattr: the new mount attributes
4494  * @mnt: the mount to which @kattr will be applied
4496  * Check whether thew new mount attributes in @kattr allow concurrent writers.
4501 				     const struct mount *mnt)  in mnt_allow_writers()
4508 static int mount_setattr_prepare(struct mount_kattr *kattr, struct mount *mnt)  in mount_setattr_prepare()
4510 	struct mount *m;  in mount_setattr_prepare()
4534 		struct mount *p;  in mount_setattr_prepare()
4539 		 * mounts and needs to take care to include the first mount.  in mount_setattr_prepare()
4547 			 * We're done once the first mount we changed got  in mount_setattr_prepare()
4557 static void do_idmap_mount(const struct mount_kattr *kattr, struct mount *mnt)  in do_idmap_mount()
4565 	 * Since we only allow a mount to change the idmapping once and  in do_idmap_mount()
4566 	 * verified this in can_idmap_mount() we know that the mount has  in do_idmap_mount()
4573 static void mount_setattr_commit(struct mount_kattr *kattr, struct mount *mnt)  in mount_setattr_commit()
4575 	struct mount *m;  in mount_setattr_commit()
4598 	struct mount *mnt = real_mount(path->mnt);  in do_mount_setattr()
4636 	 * If this is an attached mount make sure it's located in the callers  in do_mount_setattr()
4637 	 * mount namespace. If it's not don't let the caller interact with it.  in do_mount_setattr()
4639 	 * If this mount doesn't have a parent it's most often simply a  in do_mount_setattr()
4640 	 * detached mount with an anonymous mount namespace. IOW, something  in do_mount_setattr()
4642 	 * that do change mount properties on the rootfs itself. That obviously  in do_mount_setattr()
4643 	 * neither has a parent nor is it a detached mount so we cannot  in do_mount_setattr()
4650 	 * First, we get the mount tree in a shape where we can change mount  in do_mount_setattr()
4682 	 * We currently do not support clearing an idmapped mount. If this ever  in build_mount_idmapped()
4709 	 * mount. We use the initial idmapping as an indicator of a mount  in build_mount_idmapped()
4869 	struct mount *mnt = mnt_find_id_at(ns, id);  in lookup_mnt_in_ns()
4918 static u64 mnt_to_propagation_flags(struct mount *m)  in mnt_to_propagation_flags()
4947 	struct mount *m = real_mount(s->mnt);  in statmount_mnt_basic()
4962 	struct mount *m = real_mount(s->mnt);  in statmount_propagate_from()
5107 static struct mount *listmnt_next(struct mount *curr, bool reverse)  in listmnt_next()
5121 	struct mount *first, *child;  in grab_requested_root()
5132 	 * We have to find the first mount in our ns and use that, however it  in grab_requested_root()
5156 	struct mount *m;  in do_statmount()
5276 	/* The first valid unique mount id is MNT_UNIQUE_ID_OFFSET + 1. */  in copy_mnt_id_req()
5283  * If the user requested a specific mount namespace id, look that up and return
5284  * that, or if not simply grab a passive reference on our mount namespace and
5372 	struct mount *r, *first;  in do_listmount()
5441 	 * If the mount namespace really has more than 1 million mounts the  in SYSCALL_DEFINE4()
5442 	 * caller must iterate over the mount namespace (and reconsider their  in SYSCALL_DEFINE4()
5456 	/* The first valid unique mount id is MNT_UNIQUE_ID_OFFSET + 1. */  in SYSCALL_DEFINE4()
5488 	struct mount *m;  in init_mount_tree()
5520 	mnt_cache = kmem_cache_create("mnt_cache", sizeof(struct mount),  in mnt_init()
5523 	mount_hashtable = alloc_large_system_hash("Mount-cache",  in mnt_init()
5535 		panic("Failed to allocate mount hash table\n");  in mnt_init()
5565 		 * it is a longterm mount, don't release mnt until  in kern_mount()
5576 	/* release long term mount so mount point can be released */  in kern_unmount()
5631 	struct mount *mnt, *n;  in mnt_already_visible()
5636 		struct mount *child;  in mnt_already_visible()
5642 		/* This mount is not fully visible if it's root directory  in mnt_already_visible()
5648 		/* A local view of the mount flags */  in mnt_already_visible()
5655 		/* Verify the mount flags are equal to or more permissive  in mnt_already_visible()
5656 		 * than the proposed new mount.  in mnt_already_visible()
5665 		/* This mount is not fully visible if there are any  in mnt_already_visible()
5808 		.procname	= "mount-max",