linux-master/fs/namespace.c

40 /* Maximum number of mounts in a mount namespace */
683  * where shadow mounts are created. For example, during mount
710  * following mounts:
745  * mounts in the current mount namespace and test to see if the dentry
749  * need to identify all mounts that may be in the current mount
760 	rbtree_postorder_for_each_entry_safe(mnt, n, &ns->mounts, mnt_node) {
960  *              list of child mounts
1018 	struct rb_node **link = &ns->mounts.rb_node;
1031 	rb_insert_color(&mnt->mnt_node, &ns->mounts);
1170 	 * unprivileged mounts with submounts.
1394  *  mounts using a given dentry in a different namespace. This function
1433 	struct rb_node *node = ns->mounts.rb_node;
1501  * This is called to check if a tree of mounts has any
1502  * open files, pwds, chroots or sub mounts that are
1534  * open files, pwds, chroots or sub mounts. If the
1535  * mount has sub mounts this will return busy
1536  * regardless of whether the sub mounts are busy.
1594 	/* Leaving mounts connected is only valid for lazy umounts */
1602 	/* Because the reference counting rules change when mounts are
1603 	 * unmounted and connected, umounted mounts may not be
1604 	 * connected to mounted mounts.
1633 	/* Gather the mounts to umount */
1642 	/* Hide the mounts from mnt_mounts */
1647 	/* Add propogated mounts to the tmp_list */
1806  * __detach_mounts - lazily unmount all mounts on the specified dentry
1810  * detach_mounts allows lazily unmounting those mounts instead of
2209 	unsigned int mounts = 0;
2220 		mounts++;
2222 	if (mounts > max)
2225 	ns->pending_mounts += mounts;
2255  * A bind operation clones the source mount and mounts the clone on the
2258  * (++)  the cloned mount is propagated to all the mounts in the propagation
2264  * (+++) the mount is propagated to all the mounts in the propagation tree
2285  * 	all the mounts in the propagation tree of the destination mount.
2288  * 	all the mounts belonging to the destination mount's propagation tree.
2316 	 * Preallocate a mountpoint in case the new mounts need to be
2317 	 * mounted beneath mounts on the same mountpoint.
2323 	/* Is there space to add these mounts to the mount namespace? */
2958 	/* We should be allowed to modify mount namespaces of both mounts */
2983 	/* Setting sharing groups is only allowed on private mounts */
3046  *   grabbed @namespace_sem to avoid creating pointless shadow mounts.
3071 	/* Avoid creating shadow mounts during mount propagation. */
3179 	 * Don't move a mount tree containing unbindable mounts to a destination
3447 void mark_mounts_for_expiry(struct list_head *mounts)
3452 	if (list_empty(mounts))
3464 	list_for_each_entry_safe(mnt, next, mounts, mnt_expire) {
3752 	new_ns->mounts = RB_ROOT;
4313 	/* The underlying filesystem doesn't support idmapped mounts yet. */
4376 		 * mounts and needs to take care to include the first mount.
4481 	 * unconditionally check for detached mounts.
4548 	 * are aware of idmapped mounts as a convenient shortcut. A user
4676 	/* Don't bother walking through the mounts if this is a nop. */
4913 	 * mounts to show users.
5059 	 * mounts to show users.
5121 		first = node_to_mount(rb_first(&ns->mounts));
5281 	rbtree_postorder_for_each_entry_safe(mnt, n, &ns->mounts, mnt_node) {
5312 		 * locked child mounts that cover anything except for
5317 			/* Only worry about locked mounts */
5362 	 * Foreign mounts (accessed via fchdir or through /proc