vfs: Use the mounts_to_id array to do /proc/mounts and co.
Use the mounts_to_id xarray added to the mount namespace to perform
iteration over the mounts in a namespace on behalf of /proc/mounts and
similar.
Since it doesn't trawl a standard list_head, but rather uses xarray, this
could be done under the RCU read lock only. To do this, we would need to
hide mounts that are in the process of being inserted into the tree by
marking them in the xarray itself or using a mount flag.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Alexander Viro <viro@zeniv.linux.org.uk>
cc: Miklos Szeredi <miklos@szeredi.hu>
cc: Matthew Wilcox <willy@infradead.org>
3 files changed
