• David Howells's avatar
    ipc: Convert mqueue fs to fs_context · e1b836f6
    David Howells authored
    Convert the mqueue filesystem to use the filesystem context stuff.
     (1) The relevant ipc namespace is selected in when the context is
         initialised (and it defaults to the current task's ipc namespace).
         The caller can override this before calling vfs_get_tree().
     (2) Rather than simply calling kern_mount_data(), mq_init_ns() and
         mq_internal_mount() create a context, adjust it and then do the rest
         of the mount procedure.
     (3) The lazy mqueue mounting on creation of a new namespace is retained
         from a previous patch, but the avoidance of sget() if no superblock
         yet exists is reverted and the superblock is again keyed on the
         namespace pointer.
         Yes, there was a performance gain in not searching the superblock
         hash, but it's only paid once per ipc namespace - and only if someone
         uses mqueue within that namespace, so I'm not sure it's worth it,
         especially as calling sget() allows avoidance of recursion.
    Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
    Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
namespace.c 4.61 KB